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Photo of centrifugal pump
Equipment, with the help of which pumped water, is called pumping, it is divided into several groups: bulk and dynamic. In this article we will talk about the dynamic pumps, to which the centrifugal unit belongs, and what is working wheel centrifugal pump.
So, what is the centrifugal pump? As already mentioned earlier, this equipment with which water is pumped up.
How the design works:
- This happens with the help of centrifugal force. Simply put, inside the pump there is water, which, with the help of blades and centrifugal force, is discarded to the walls of the housing.
- After that, water under the action of pressure begins to flow to the pressure and suction pipeline.
Thus, the water continuously starts swing. To better understand how this happens, it is necessary to figure out what the pump consists of.
For which the pump is used
How water pumping occurs through the pump in theory is already clear, but what parts of it help in this matter - no.
Let's talk about what parts it consists of:
- The impeller of the centrifugal pump.
- Pumping shaft, also an important part.
- Selns.
- Bearings.
- Case.
- Pumping machine.
- Sealing rings.
Note. Centrifugal pumps are used not only for water production, and chemical fluids are also produced, therefore, composite pumps may vary depending on the method of their use.
Working wheel
One of the most important details The pump is a impeller, since it is it that creates centrifugal power, water under pressure begins to pump.
So, let's wonder what it consists of, and how it works, it consists of:
- Front disk.
- Rear disk.
- The blades that are between them.
- When the wheel starts to rotate, water inside the blades, also begins its rotation, because of which it occurs centrifugal force, pressure appears, water is adjacent to the periphery and is looking for a way out.
Since the pumps are swing not only water, but also chemical liquids, so the impellers and the centrifugal pump housing are made from a variety of materials:
- For example, bronze or cast iron is used to work with water.
- To improve wear resistance when working with water, which contains mechanical impurities, you can use the impeller made of chromium cast iron.
And if the pump is designed to work with chemicals, it is necessary to use a steel impeller.
Characteristics of the impeller
Below will be the table of working wheels classifications:
| Classification of the impeller of the centrifugal pump | |
| Number of working wheels |
|
| Axis |
|
| Pressure |
|
| Liquid submission |
|
| Method of housing connector |
|
| Method of removal of liquid |
|
| SPECIALLY |
|
| Purpose |
|
| Engine connection |
|
| Located in relation to water |
|
Causes of the kneading wheel
Often, the main cause of the breakdown of the impeller is cavitation, that is, the vaporization and formation of steam bubbles in the liquid, which entails the erosion of the metal, since there is a chemical aggressiveness of gas in liquid bubbles.
The main causes of cavitation is:
- High, more than 60 degrees Temperature
- Not dense compounds on the suction pressure.
- The greater length and small diameter of the suction pressure.
- Clogging suction pressure.
Council. All these factors entail a breakdown of the pump impeller, therefore, you need to carefully follow the observance of the working conditions of your equipment. After all, it is not for nothing for each type of technology, there are our operating conditions that are created for greater wear resistance.
Symptoms of the impeller
The vehicle breakdown of the centrifugal pump can not be noticeable immediately, however, there is general signsthat indicate that with your technique something is wrong:
- Suction drying.
- Noise.
- Vibration.
Council. If you have noticed the above-described signs in your pump, it is necessary to stop its work. Since cavitation reduces the PDD of the pump, its pressure and accordingly the performance.
Moreover, it affects not only the work of the wheel, but also to other parts of its details. With long-term exposure to cavitation, the details become rough, and the only thing that will help them - is the repair or purchase of new equipment.
Repair of the impeller
If the impeller still broke, or the pump broke, it can be repaired with his own hands.
Council. But it is better to contact a specialized repair, as this requires special tools.
Nevertheless, here is a small instruction, how the working wheels of the centrifugal pump are made independently.
Disassembly:
- Using the shooter, a half.
- The rotor is applied to the unloading disk to the end, where suction is performed.
- Mark axis shift arrow.
- Disassemble bearings.
- Remove the liners.
- With the help of a special pull-out discharge disk.
- Using squeezing screws alternately, not allowing tasks, remove the impeller from the shaft.
Repair of the impeller:
In order to repair the repair of the centrifugal pump of the centrifugal pump.
Steel:
- If the wheel is worn, first, it is guided, after which it is pulled out on the lathe.
- If the wheel is very worn, then it is removed, and then welded new.
Cast iron:
- Cast-iron wheels, as a rule, simply change, if you can get around sharpening, then the necessary places are poured with copper, and then drag.
After the wheel is repaired or replaced, the pump is collected back:
- Wipe the centrifugal pump.
- Check the presence of burrs and care, if it is, they are eliminated.
- The impeller is collected on the shaft.
- Return a discharge disk.
- Install a soft packing of the glands.
- Wrap nuts.
- Rolling the gland.
- The rotor is supplied to the head of the discharge disk to the heel.
For greater understanding of the repair process, you can watch the video in this article.
Prices
The price of the impeller in different stores is its own, it all depends on the material of the pump itself. The initial cost of 1800 rubles, the ultimate - 49 tr. It all depends on what is your centrifugal space, for which you use it, and what size it is, as well as how many wheels in it.
Therefore, in order to avoid the cost of repair, you must carefully follow its work. And also, when there are any signs that indicate its malfunction, it is not necessary to use it until it stops work, it should be attributed to a specialist who will replace or repairs to you those details that have been breaking.
IN everyday life among various deviceswhich were created to pump all sorts of liquids, most efficient and practical, not without reason, the centrifugal pump is considered. Easy design, combined with high performance and the ability to create a large pressure, led wide application Such an aggregate is almost all spheres of vital activity of a modern person.
This type of equipment includes most pumping stations or household pumps, which are used for the device in private buildings of autonomous water supply and for watering country areas.
The principle of operation of such devices is based on the physical law The occurrence of centrifugal force, which occurs with the rotational effect of the blades of the wheel on the liquid. To better understand the principle of operation of the pump, you need to thoroughly explore the main types and constructive feature of this unit.
Classification of centrifugal pumps
Centrifugal pumps can be conventionally classified in a number of design characteristics.
By the number of steps:
By number of disks of the impeller:
- Only with a disk in the back of the impeller.
- With a disc in the back and front of the wheel. Such devices are used to pump a thick liquid or in low pressure plumbing networks.
In the direction of the axis of rotation:
- With horizontal location shaft. Such pumps, because of the ease of maintenance, are considered the most common models.
- Models with shaft vertical location require much less place For installation, as the motor is located above the housing. Most borehole pumps Below to such a type due to the constricted conditions for their work. The essential disadvantage of such models is the complexity in the maintenance and repair of pumps, since it has to remove the engine.
According to the water being created, pumps are:
- High pressure (from 0.6 MPa).
- Average pressure (0.2-0.6 MPa).
- Low pressure (up to 0.2 MPa).
By installation method:
According to the method of water intake:
- Self-priming. Such pumps are capable of lifting water from a depth of about 8 meters in practice, and 10.34 meters are theoretically considered. The inconvenience of the operation of the unit is considered to be needed before starting, filling the system with water. And the reinforced suction hose also. The most important element is an check valvewhich holds water, with short-term pauses in work.
- Normal suction pumps. This type of pumps includes all submersible aggregates, as well as surface, in which the liquid comes with a self-shot. Water into the cavity of such a pump is filled only when it is first started.
By speed:
- Pacific.
- Normal stroke.
- High-speed (speed) - the impeller in such aggregates is on the sleeve.
For appointment:
- Plumbing.
- Sewer.
Characteristics of the centrifugal pump
Despite the huge variety of models of aggregates for pumping fluid, there are several basic characteristics based on which, you can choose the appropriate system in a particular case.
The main operating parameters are considered:
- Performance.
- Power consumption.
- Pressure (outlet pressure).
A feature of the pumps of a centrifugal type is the dependence of their performance from pressure. Such dependence is called pressure or the main characteristic pump. This feature in the product passport is indicated in the graphic image, less often in the form of a table. If you want to solve the question of the optimal selection of the model, then you first need to determine the necessary pressure, which consists of the desired height of the lifting of the fluid, plus the hydraulic resistance of the system, plus the pressure required at the remote point of the water intake.
The selected pump model will be optimal if the necessary performance and pressure will be depicted in the middle of the main characteristic.
Details of the centrifugal pump
Modern pumping centrifugal type aggregates have approximately the same constructive construction. They have a working body, which is a wheel, and a hull. On the working wheel there are special blades, with which water is moved inside the instrument. Due to the rotation of the blades, a centrifugal force is created, moving fluid to the exhaust valve, creating a certain pressure, due to which the water is pushed out.
Quite often, other structural devices are installed on such aggregates, which the design of pumps make universal:
The impeller of the centrifugal pump
Working wheel any centrifugal pump is considered the main part Such a design. Depending on the place of operation of the pump, from the power of the installed engine and on the nature of the pumped fluid, the impeller may vary:
Shaft
This detail of the centrifugal pump is the most susceptible to damage during operation. The installation of the shaft must be made with accurate centering and balancing. . Shafts can be:
- Flexible type applied when the engine is running at elevated circulation.
- Hard shafts are used with normal motor revolutions.
Work shafts from alloyed, adhesive and stainless steel are manufactured.
Principle of operation of the centrifugal pump
Principle of operation of the device for pumping fluid Centrifugal type is quite simple. Under the action of a rotating impeller, centrifugal forces, moving water flows, are created. The impeller itself is tightly naked on the worker of the unit. And he, in turn, with the help of a magnetic coupling is connected to the electrical engine of the system. The engine rotates the impeller, which creates the possibility of moving the fluid. More convenient I. simple method Pumps of liquid until modern science has developed.
Advantages of application
There are two main types of advantage of using centrifugal type aggregates - constructive and functional.
The simplicity of the centrifugal pump scheme allows you to install all equipment in relatively small housingwhich causes their compactness and relatively small mass. Of course, the dimensions and weight of the aggregate are directly dependent on the power of the installed engine. Such a device is easy to move and one person. The use of this type of equipment is considered reliable and durable.
The main functional advantage of this type of aggregates is the possibility of a smooth supply of fluid, which is achieved by using the system of protection against hydrowards. The launch of centrifugal pumps is made easily.
Application on industrial facilities
Construction of centrifugal aggregates Allows you to mount in those places where the installation of other equipment is difficult to determine, due to their large dimensions. The use of such liquid pumping systems has been greatly distributed in the oil and chemical industry. national economy. They are capable of pumping various mixtures under pressure, heavy components, petroleum products, acids and many other liquids, which are considered to be chemically active substances.
Ability to maintain constant pressure various temperatures Liquids, allows you to widely use similar aggregates to create forced circulation in heating systems.
The ability to work with contaminated and clean liquids causes widespread use of such systems in the well pumping after drilling.
Rules of operation of centrifugal systems
In order for the centrifugal unit to serve for a long time and reliable, it is recommended to install various measuring I. control devices , based on the testimony of which you can adjust optimal mode Equipment work.
The company "Contract Motor" offers its customers high-quality horizontal pumps of types D and 1 D.
This modification of pumping equipment is best suited for pumping large volumes of water at temperatures up to + 85 ° C. In this connection, the demand for them turned out to be consistently high for many decades. It is for this reason that on the company's website pumps d and pumps 1D, you will find in the widest assortment.
One of the modification of pumps d and 1d, the so-called network pumps, as well as pumps d and 1d and are denoted by the abbreviation of SE. SE pumps are designed to pump water with a temperature of up to +180 ° C. In addition, PE pumps differ from pumps D and 1D using a modified cast iron in the manufacture of a housing, a certain steel grade (20x13l) in the manufacture of the impeller, and also have water shirts cooling around the seal nodes.
High suction ability (suction height up to 5.5 m) and cavitation qualification pumps 1D are distinguished from the console type pumps.
Pump d (1d, 2d, blood pressure) is a centrifugal pump of two-way entrance. DV pumps are called the horizontal pump, since the input and outlet nozzles are in one horizontal plane.
All type d pumps are centrifugal, single-stage, horizontal pumps. They have a double-sided semi-suite fluid supply to the central wheel, as well as a spiral removal. Horizontal pumps obtained their name on the connector located in the horizontal plane. It is very convenient because it allows you to have suction and pressure pipes at the bottom of the housing, so that the engine repair and dismantling can be performed without the need to disconnect the pipes. Electric motors in the pump unit are driven by a pump rotor through an elastic sleeve-finger coupling. Support pumps are about 20 thousand hours, which confirms the quality and reliability of the equipment.
In this case, radial or, as an option, radial-resistant bearings are used. Type pumps are used most often at pumping stations of industrial, rural and urban water supply, as well as for draining and irrigation of fields.
Number designation d and 1d
1D315-50
- 1 -Modification number
- D.-Type of pump
- 315 -Podach (volume) in m3 / h
- 50 -Nap (lifting) in m
If the designation is additionally marked the letter A or B (for example 1D315-50A), this means the reduced diameter of the impeller (wheel trimming), if the letter B is indicated in the pump brand, then this (double trimming wheel) double decrease in the diameter of the impeller. Accordingly, with a decrease in the diameter of the impeller, the basic parameters of the pump (feed, pressure) are changed.
1d pump in context
- 1. Housing
- 2. Cover
- 3. Protective sleeve
- 4. impeller
- 5. Val.
- 6. Sealing ring
- 7. Putting the gland
- 8. Bearing
In order not to make a mistake with the choice and acquire, indeed, high-quality pumping equipment, we recommend using the consultation of our managers to purchase horizontal pumps D and 1D. The contract "Contract Motor" guarantees product compliance with all applicable requirements and norms. In addition, horizontal pumps in the company "Contract Motor" can be purchased by low enough and attractive prices with which you can read in more detail in the relevant section of the site.
The company "Contract Motor" offers its customers all the best and sincerely hopes for a long-term cooperation with you.
Table of replacement of horizontal pumps D:
| Since 1973. | Since 1982. | Since 1990 |
|---|---|---|
| 5 NDV | D200-36. | D200-36. |
| 4 NDV. | D200-95 | 1D200-90. |
| 6 NDV | D320-50 | 1D315-50 |
| 6 VAT | D320-70 | 1D315-71 |
| 10 d 6. | D500-65 | 1D500-63 |
| 8 NDV | D630-90. | 1D630-90. |
| 12 d 9. | D800-57 | 1D800-56 |
| 12 VAT | D1250-65 | 1D1250-63 |
| 14 d 6. | D1250-125 | 1D1250-125 |
| 14 VAT | D1600-90. | 1D1600-90. |
| 16 NDV | D2000-21 | AD2000-21-2 |
| 20 d 6. | D2000-100 | AD2000-100-2 |
| 18 VAT | D2000-62. | AD2500-62-2 |
| 20 NDV. | D3200-33. | AD3200-33-2 |
| 20 VAT | D3200-75 | AD3200-75-2 |
| 22 VAT | D4000-95 | AD4000-95-2 |
| 24 NDV | D5000-32. | AD6300-27-3. |
| 24 VAT | D6300-80 | AD6300-80-2 |
/ Horizontal pumps type D, 1D, 2D
Pump horizontal bilateral entry type D, 1D, 2D
D. type pumps - with a horizontal shaft of a single-stage - are intended for pumping water and other liquids at temperatures up to 85 ° C, similar water by viscosity and chemical activity, as well as chemically active liquids (hydrogen indicator of pH from 4 to 12), oil, processing products with kinematic The viscosity of up to 10 is 4 m2 / s and liquids with a content of mechanical impurities no more than 1% and with the size of solid particles not more than 0.2 mm.
For pumps intended for pumping oil and petroleum products, the material of the flow part is indicated by the letter B; chemically active liquids - k; water with mechanical impurities to 1% - in; For other types of running part, the content of mechanical impurities in the pumped liquid is allowed to 0.05%.
The pumps of this type can be used for the supply range Q \u003d 40 - 1800 L / C and the heads of H \u003d 15 - 100 m, the power of the engine of these pumps is n \u003d 15 - 2000 kW.
High power pumps are manufactured by individual orders.
Pumps are indicated as follows (on the example of the pump D200-90):
D - pump of bilateral entrance;
200 - supply of the pump in m3 / hour;
90 - pressure in m. Waters. Art.
A pump with a sharpeble impeller is denoted by D200-90A.
The characteristics of some types of pumps are shown in the table.
Features of the design and purpose:
Centrifugal, horizontal, single-stage pumps Type D, 1D and 2D have a double-sided semi-suite fluid supply to the impeller and spiral removal.
The pump housing has a connector in the horizontal plane. The location of the suction and pressure pipe at the bottom of the pump housing allows you to repair without disconnecting pipes and dismantling the engine. The engine drives the rotor of the pump through the elastic flower and finger coupling. Rotor supports are radial or. Bilateral impact impeller, which ensures equilibrium of the axial forces.
Double gland seals reliably prevent leaks on the shaft.
Type d pumps are designed for pumping clean water to 85 ° C. Applied by pumping stations The first and second lifts of urban, agricultural and industrial water supply, as well as for irrigation and detecting fields. Material of the main parts: housings, covers and impeller - cast iron СМ 18-36; Shaft - steel 45.
Device and principle of operation of the pump type
On the total foundation frame of the electric pump unit, the pump itself is installed directly connected by an elastic sleeve-finger clutch with a drive motor. Electric pump type D is a centrifugal, horizontal single-stage with a double-sided semi-suite fluid supply to the impeller. It has a spiral tap and the shaft seal.
The type d and housing cover is made of cast iron, in the horizontal plane through the rotor axis there is a connector. The disassembly of the pump is possible without disconnecting pipelines and removal of the engine, due to the fact that the injection and suction pipe of the pump are located at the bottom of the housing.
For the possibility of attaching a vacuum pump or for the release of air when the pump is filled with gravity in the upper part of the case cover, the hole M16x1.5 is provided. The leakage of fluid on the shaft prevents the gland seal. For pumps 1D hydraulic shrovers are performed by supplying a fluid to the jacket ring on the channel in the pump lid
The housing and the housing cover from wear protect the sealing rings, which also reduces fluid leaks from the pressure cavity into the suction. In the horizontal pump of type D, an impeller was installed, which ensures reliable pump operation,
What pumped pump:
Water and other liquids are similar in chemical activity, temperatures up to 85 ° C, viscosity to 36cst. The content of solid inclusions is allowed not more than 0.05% by weight, up to 0.2 mm and microhardness of not more than 6.5 GPa (650 kgf / mm 2).
An example of marking:
1 - serial number modernization;
D - type of pump (bilateral entrance);
first digits - feed, m3 / h;
Figures after dash - pressure, m;
The letters "A" and "B" after numbers - the index of the first and second turnover of the impeller;
Next - the designation of the climate execution and the category of placement;
Technical characteristics of pump pumps d, 1d, 2d
| Mark pump | Feed, m 3 / hour | Head, M. | Rotation frequency, rpm | Power consumption, kW | Allowable cavitation reserve, m |
| 160 | 112.00 | 2900 | 89.00 | 4.80 | |
| 150 | 100.00 | 2900 | 72.00 | 4.80 | |
| 135 | 80.00 | 2900 | 52.00 | 4.80 | |
| 80 | 28.00 | 1450 | 12.00 | 4.50 | |
| 70 | 25.00 | 1450 | 10.00 | 4.50 | |
| 200 | 36.00 | 1450 | 37.00 | 4.30 | |
| 190 | 29.00 | 1450 | 30.00 | 5.30 | |
| 180 | 25.00 | 1450 | 22.00 | 6.00 | |
| 320 | 50.00 | 1450 | 72.00 | 4.50 | |
| 300 | 39.00 | 1450 | 47.00 | 4.60 | |
| 300 | 30.00 | 1450 | 36.00 | 4.80 | |
| 200 | 90.00 | 2900 | 82.00 | 5.50 | |
| 180 | 74.00 | 2900 | 72.00 | 5.80 | |
| 160 | 62.00 | 2900 | 42.00 | 5.90 | |
| 100 | 22.00 | 1450 | 12.50 | 5.30 | |
| 250 | 125.00 | 2900 | 152.00 | 6.00 | |
| 240 | 101.00 | 2900 | 110.00 | 6.40 | |
| 125 | 30.00 | 1450 | 27.00 | 5.50 | |
| 315 | 50.00 | 2900 | 68.00 | 6.50 | |
| 300 | 42.00 | 2900 | 50.00 | 6.70 | |
| 220 | 36.00 | 2900 | 39.00 | 6.80 | |
| 315 | 71.00 | 2900 | 98.00 | 6.50 | |
| 300 | 60.00 | 2900 | 80.00 | 7.00 | |
| 500 | 63.00 | 1450 | 142.00 | 4.50 | |
| 450 | 53.00 | 1450 | 97.00 | 4.80 | |
| 400 | 44.00 | 1450 | 78.00 | 5.00 | |
| 630 | 90.00 | 1450 | 230.00 | 5.50 | |
| 550 | 74.00 | 1450 | 185.00 | 5.80 | |
| 500 | 60.00 | 1450 | 144.00 | 5.90 | |
Bilateral entrance pumps (constructive type D) are reliable, verified in different conditions operation at water supply facilities for the needs of housing and communal services and in industry. Centrifugal pumps of type D, 1D, 2D from the domestic manufacturer JSC Livgidromash JSC are designed for patching fresh, sea wateras well as other non-toxic fluids with the following indicators:
- density in the range of up to 1100 kg / m 3;
- viscosity up to 60 WST;
- heating temperature up to 95 ° C;
- solid particles weighing no more than 0.05% and up to 0.2 mm in size.
The nominal specifications of the pumps of type D and pumping units are within the following ranges:
- feed from 70 to 2000 m³ / hour;
- pressure from 10 to 125 m;
- electric motor power from 8 to 610 kW;
- the frequency of rotation of the electric motor from 730 to 2900 rpm;
- Efficiency up to 88%;
- cavitation reserve not more than 4.2 - 7 m;
- the average resource is 30,000-35,000 hours before major repairs.
The aggregates can work in seismically active areas with a threat of up to 7 points (MSK-64 scale).
For use in production conditions with increased risk of explosion or fire (Class 1 - 2), the most rational solution is to buy pumps of series D, 1D and 2D, equipped with explosion-proof electric motors, the "E" execution index will be indicated in their marking.
Scope of pumps type d
The aggregates with the pumps of the bilateral entrance found their application:
- in industrial supply for feed and cold, and hot water;
- in various systems water intake, land reclamation;
- on oil development for pumping fluid;
- on oil refining enterprises in order to pump water containing residues of petroleum products;
- at the objects of the chemical industry;
- on thermal and nuclear power plants for supplying technical water;
- in metallurgy as part of cooling systems;
- in the fire extinguishing complexes of seaports;
- in industrial fire extinguishing systems when using installations with a diesel drive.
Constructive differences
All pumps related to type D are centrifugal, single-stage, have a horizontally located shaft. The design and operational peculiarity of the impeller of the pump consists in the modes of the two-way semipal supply of fluid at the inlet and spiral removal of the fluid at the outlet.
Due to the bilateral entrance, a mutual equilibration of axial loads on the shaft occurs. Bearing nodes are successfully coping with residual axial forces.
The pump and the drive electric motor are connected using the coupling. The basis of the unit is the total foundation frame that is fixed on durable concrete base (mass of foundation\u003e 4 masses of the unit).
The pump has a cast iron or steel case, with a removable top.
In a number of models, the flow part is made of cast iron with anti-corrosion coating, chromonichel steel, bronze, which provides an increased service life and higher specifications pumps 1d and 2d.
Due to the fact that nozzles are located at the bottom of the case, disassembly and maintenance The pump can be carried out without removing the electric motor and without dismantling pipelines.
Consumers choosing pumps for pumping fluids with a temperature of more than 60 ° C should ensure the supply of coolant to the gland seal from the additional source.
Advantages of pumps such as
- The possibility of working in chemically active media: with sea water, with plastic water and non-toxic fluids.
- The selection of the diameter of the impeller depending on the requirements of the customer provides the optimal selection of the pump with the necessary characteristics.
- Features of constructive execution allow you to reduce the axial forces and loads on the bearings.
- For high-pressure pumps, a solution was found that made it possible to reduce radial loads on the rotor (due to the execution of the flow part in the form of a double helix).
- Easy to perform current repair work without disconnecting pipelines.
Experts note that models of types of types D, 1D, 2D slightly inferior in terms of energy efficiency, KSB (Germany) pumps are superior to the efficiency of the VIPOM brand (Bulgaria).
In the catalog of pumps type D with characteristics and types of performances, a generally accepted symbol is used:
1D 630-90A (2) -T-A-E-U2 TU-2606-1510-88, where:
- 1 - designation of the pump upgrade number; D - bustorone entrance (designation by type of pump);
- 630 - nominal feed, cubic meters;
- 90 - nominal pressure, m;
- indices "A" and "B" denote the trimming of the impeller (first and second), the index "M" - an increased impeller;
- (2) - the designation of the speed of the component engine. Used for convenience only in the catalog on our website.
- t - elder sealing shaft (single); The default notation is not, which corresponds to the installed double gland. Plant - the manufacturer has the ability to install a double tandem compaction or a single seal with auxiliary.
- A - material of the impeller and body (flowing part): without designation - from cast iron (sch 25), the PCP is made of cast iron having anti-corrosion coating; A - from carbon steel (25l), k - from chromonichel steel (12x18n9t); B - impeller made of bronze;
- E - Execution for explosion protection: E - for explosion-fire protected units, without an index - for pumps (aggregates) of general industrial use
- U2 - the execution of the pump on the climatic type and the placement category;
Pump catalog D includes 123 typical models of several sizes. On the favorable conditions You can choose and buy pump D or upgraded options for 1D and 2D.
Technical documentation
Download: Operation Manual No. 03.3.302.00.00.000 Ree / Tu-2606-1510-88 "Pumps Centrifugal Two-Fortener Type D and Electric Aggregates"
Download: Certificate of Compliance No. C-RU.A95.V.00116 / TU 26-06-1510-88 "Pumps Centrifugal Bilateral Type D Type, Electric Aggregates based on them and spare parts to them"
Download: Certificate of Compliance No. C-RU.A5.V.00362 / TU 3631-356-00217975-2010 "Pumps Centrifugal Bilateral Input 1D-320-50"
Download: Application Permission No. RR 00-041461 / TU 26-06-1510-88, TU 3631-026-05747979-96 "Pumps Centrifugal Multistage Sectional Types 1CNSG, Pumps Centrifugal Two-Side Type D Type, Electrogenation Aggregates based on them"
DOWNLOAD: SERFORM SUBJECT FOR ORDER OF PUMPS (GENERAL)
Download: Technical Catalog for Delium Upgraded Pumps
Purpose
Pumps Centrifugal bilateral input type D and electrical pumping units based on them are intended for pumping water and chemically active non-toxic liquids with a density to 1100kg / m 3, viscosity up to 60 10 -6 m 2 / s (60cst), temperature up to 368K (95 ° C) not containing solid inclusions by weight of more than 0.05%, the size of more than 0.2 mm and microhardness of more than 6.5 GPa (650kgs / mm 2).
Pumps belong to the general purpose products of the form I (recoverable) GOST 27.003-90.
Pumps and aggregates are manufactured in climatic execution and the category of placement UHL 3.1, U2 and T2 according to GOST 15150-69.
Pumps and electrical aggregates are designed to be supplied to export in accordance with OST 26-06-2011-79.
Pumps and aggregates are designed for areas with seismic activity up to 7 points inclusive on the MSK-64 scale.
Pumps and aggregates are made in accordance with the general security requirements according to GOST R 52743-2007. The aggregates with pumps that have the Execution index "E" and equipped with explosion-proof electric motors can be used in explosive and fire-hazardous industries in class 1 and 2 GOST R 51330.9-99 areas.
Design
A pump type d - centrifugal duplex entry, a horizontal single-stage with a double-sided semipal supply of fluid to the working wheel of the two-way entrance and a spiral tap.
The principle of operation of the pump is to transform the mechanical drive energy to the hydraulic energy of the fluid due to the hydrodynamic effects of the blade system of the impeller, supply and removal.
The electric pump aggregate consists of a pump and drive motor installed on a common welded foundation frame and interconnected using a coupling.
The pump housing is a cast-iron or steel casting, which has a connector in a horizontal plane passing through the axis of the rotor.
Suction and injection pipes of the pump are located in the lower half of the case and are directed to different sidesThrough what is possible disassembling and repairing the pump without disconnecting pipelines and removing the electric motor.
Connecting dimensions The flanges of suction and pressure pipes are made according to GOST 12815-80 (execution 1). At the request of the consumer is allowed for flanges. Execution 3 GOST 12815-80.
The configuration of the case channels continues the case of the housing. In the upper part of the case cover, a hole M16x1.5 is provided, a plug closed to attach the vacuum pump or connecting the vacuum system, as well as for the release of air when filling out the pump "Self-".
The direction of rotation of the rotor is left (counterclockwise), if you look from the drive side. At the request of the customer, it is possible to produce a pump with the right rotation of the rotor (clockwise).
The impeller is a bilateral entrance, which allows mainly to balance the axial forces. Residual axial forces are perceived by radial or radially resistant ball bearings.
To prevent leaks on the shaft in the shaft in the pump housing, glands or single end seals are installed.
Application
- in hot and cold water supply systems / heat supply
- in water intake systems
- for supplying the plastic fluid on petroleum fields
- to supply seawater in fire extinguishing systems Sea port facilities
- for pumping water with an admixture of petroleum products on oil producing and refineries
- in chemical industry For pumping liquids similar in their properties with water
- for pumping technical water at heat efficiency facilities, including nuclear power plants
- in the metallurgical industry in cooling systems
- in the fire extinguishing systems of industrial and civil facilities, including in the installations with diesel drive
Features / Benefits
- various versions According to the materials of the running part, it allows you to use pumps in various fields of industry and used both for pumping water and for pumping sea water, plastic water and chemically active non-toxic liquids;
- various performances on the diameter of the working wheels, including at the request of the customer, allows you to optimally select the pump parameters depending on the required characteristics at the place of operation;
- the use of the working wheel of the two-way entrance allows you to balance the axial forces and reduce the load on the bearings;
- the execution of the running part on high-pressure pumps in the form of a double helix allows to reduce the radial load on the rotor when the pump is running on non-rominative modes;
- the presence of a horizontal connector of the pump housing and the pump covers allows you to repair at the place of operation without dismantling pipelines.
Symbol
For example: 1D200-90 A-T-A-E-in 2 TU-2606-1510-88 Where:
- 1 - Serial pump modification number
- D. - double-sided entrance pump
- 200 - Feed, m 3 / h (in nominal mode at a rated speed of rotation, for the main execution by the diameter of the impeller)
- 90 - pressure, m (in nominal mode at the rated speed of rotation, for the main execution by the diameter of the impeller)
- but - impeller index of the impeller: a, b% of the diameters of the impeller, M is increased.
- t. - Type of shaft seal: Without designation - double gland, T is a single mechanical seal. At the request of the consumer, it is possible to install a double fading seal type "tandem" or single with auxiliary.
- BUT - execution by the material of the flow part (parts of the case / impeller): without designation - gray cast iron (sch 25), PKP - gray cast iron with anti-corrosion coating of the flow part of the case and lid; A- carbon steel (steel 25l), K- chromonicel steel type 12x18n9t; B - Bronze impeller
- E. - Execution index: E - for pumps (aggregates) intended for operation in explosive and fire-hazardous industries, without designation - for pumps (aggregates), not intended for operation in explosive and fire-hazardous industries;
- U2. - Climatic performance and placement category.
Jumping materials
Operating Manuals:
Manual №Е03.3.302.00.00.000 RE / TU-2606-1510-88
"Pumps centrifugal two-way entrances of type d and electro-pumping units"
Certificates, Permissions:
Certificate of conformity NOTS RU C-RU.AY45.V.00238 / TU 26-06-1510-85, TU 3631-066-05747979-96, TU 26-06-1640-91
"Pumps centrifugal bilateral entry d and electronas aggregates. Based on them; centrifugal pumps bilateral entry for pumping petroleum products and units Elektornas. Based on them; Pumps centrifugal CN and Electronasse aggregates. Based on them"
Certificate of conformity NETS-RU C-RU.AY.45.V.00224 / TU 3631-356-00217975-2010
"Pumps centrifugal bilateral inputs of 1D 320-50, centrifugal pitch pumped horizontal bilateral inputs for pumping petroleum products and electrical pumping units based on them"
Polls:
"A questionnaire for ordering pumps (general)"
Specifications
| Pump | Feed, m 3 / h | Head, M. | Power consumption, kW | Rotation frequency, rpm |
| D 160-112m-2 | 160 | 122 | 80 | 2900 |
| D 160-112m-4 | 90 | 30 | 12 | 1450 |
| D 160-112-2. | 160 | 112 | 89 | 2900 |
| D 160-112-4 | 80 | 28 | 12 | 1450 |
| D 160-112A-2 | 150 | 100 | 72 | 2900 |
| D 160-112A-4 | 70 | 25 | 10 | 1450 |
| D 160-112b-2 | 135 | 80 | 52 | 2900 |
| D 160-112b-4 | 70 | 21 | 7.6 | 1450 |
| D 200-36-4 | 200 | 36 | 37 | 1450 |
| D 200-36A-4 | 190 | 29 | 30 | 1450 |
| D 200-36B-4 | 180 | 25 | 22 | 1450 |
| 1D 200-90-2 | 200 | 90 | 82 | 2900 |
| 1D 200-90-4 | 100 | 22 | 12.5 | 1450 |
| 1D 200-90A-2 | 180 | 74 | 72 | 2900 |
| 1D 200-90B-2 | 160 | 62 | 42 | 2900 |
| 1D 250-125-2 | 250 | 125 | 152 | 2900 |
| 1D 250-125-4 | 125 | 30 | 27 | 1450 |
| 1D 250-125A-2 | 240 | 101 | 110 | 2900 |
Design of centrifugal pumps
Design is made on the basis of the accumulated experience of creating different types pumps. Moreover different areas Pumps are used its approach. This chapter discusses the design of fixed general industrial pumps. A distinctive feature It is their work in to cavitation, which is associated with their long-term operation and the need to exclude cavitation destruction.
Despite the differences in the rationale for kinematic parameters and geometric sizes The running part, there is a general approach in the design of pumps of various types. Design includes compilation and analysis of the technical specifications, the choice of the main parameters and hydraulic calculations, the performance of the sketch layout of the machine, carrying out the testing and clarifying calculations, the performance of the drawings general view Machines and individual details.
The graphic part of the project and the explanatory note are performed in accordance with GOST 2.109-73, GOST 2.305-68 (ST SEV 367-76), GOST 2.108-68, GOST 2.307-68, GOST 2.308-68, GOST 10356-63, GOST 2789- 73, GOST 2.309-79, GOST 2.104-68 (ST SEV 140-74, 365-76), GOST 2.105-68 and GOST 106-68.
Technical task on design
The design of the blade centrifugal pump includes the following key data:
but) physical properties Purchased Wednesday:
r is the density of the pumped liquid, kg / m 3;
m - dynamic viscosity coefficient, PA C;
R NP is the pressure of saturated vapor of the working fluid, Pa (the physical properties of the pumped medium are given for the calculated temperature T 0 K);
b) pump parameters on the calculated mode:
N. - pressure, m;
Q. - volume flow of fluid through the pump, m 3 / s;
c) additionally data. Along with the basic information about the pump, additional data is given that allow us to properly approach the design of the pump.
Such data include:
Information about the prescription of the pump and the area of \u200b\u200bits use;
Possible boundaries of change operating conditions;
Technical requirements (PDA pump, mass, dimensions);
Ergonomic (noise level, dB, vibration, mm or m / s 2, magnitude
external leakage, m 3 / s);
Indicator of technical aesthetics and physiological indicators,
characterizing the convenience of servicing the pump;
Economic (the cost of the pump or its installation, maintenance and
repair), resource, availability of individual nodes for service and more.
Calculation of the main parameters and geometric
the size of the impeller
2.3.1. Definition of wheel speed
The frequency of rotation of the impeller is determined by the Formula Rudneva S.S. /sixteen/
where C - the cavitation coefficient of speed is chosen in
depending on the requirements for the pump;
For long work on the 1st critical regime
cavitation with 1 \u003d 800¸1100;
To work the pump in the second cavitation mode
C 2 \u003d 1000¸1800 (200).
The use of the Schnechocentrifugal stage allows you to take values \u200b\u200bfrom 2 \u003d 1800¸3000 (5000)
- the calculated value of the subitator;
D. h. - Subject at the entrance to the pump, D h.\u003d 1.5¸20 m.
The coefficient of 1.15¸1.3 according to GOST 6134-71.
2.3.2. Definition of the coefficient of speed
. (2.2)
2.3.3. Determination of the diameter of the entrance to the wheel D. VK
It comes down to the definition of the diameter of the average values \u200b\u200bof the coefficient incoming in the formula:
- The reduced diameter of the impeller.
Finally
. (2.4)
The coefficient of 0 is selected from the following considerations / 16 /:
1. The impeller has a large cavitation stock and cavitation in it is excluded. In this case, from the conditions for obtaining a minimum of the relative speed of the fluid input to the impeller
To 0.\u003d 3.3¸3.7.
2. In the case of calculating the pump on the 1st critical cavitation regime To 0.\u003d 4.2¸4.6. Moreover, large values \u200b\u200bare selected if the pump is possible when overloading.
3. When calculating the 2nd critical cavitation regime To 0.\u003d 4¸6 depending on the value FROM 2. So, for example, according to V.V. SAMEL / 16 /
TO 0 \u003d 4,3¸4,65, FROM 2 \u003d 1230¸1400,
TO 0 \u003d 5,2¸5,7, FROM 2 \u003d 1500¸2500.
The diameter of the sleeve D. Vm is determined by the approximate formula:
where N. - Pump power, kW;
a \u003d. 0.120¸0,130 - for console pumps;
but \u003d 0.150¸0,160 - for multistage pumps.
2.3.4. Definition of wheel width at 2 at the exit
Width wheel at 2 Determined on the basis of statistical data on the formula
where 
for n. S £ 120;
for n. S\u003e 120.
Received at 2 It is preliminary and will be refined upon subsequent profiling of the meridional cross section of the impeller.
2.3.5. Approximate definition of outer diameter
impeller D. 2
Diameter size of the output of the impeller D. 2 depends on the number of blades in the wheel z. and on the corner of the installation of the blades at the exit B L2.
In the first approximation size D. 2 is defined on the basis of statistical data by Formula / 16 /
where 
;
.
2.3.6. The choice of the number of leopards z.
The number of blades are chosen according to statistical data depending on the speed factor n. S and wheel sizes / 16 /:
n. S \u003d 50¸60; 60¸180; 180¸350; 350¸600;
z. \u003d 9¸8; 8¸6; 6; 6¸5.
For small-sized pumps, fewer blades are chosen to reduce the streaming of the flow with blades, the thickness of which with a decrease in the size of the wheel relatively increases. This is achieved to improve the suction ability of the wheel and reduce hydraulic losses. Sometimes in low-speed wheels, part of the blades are performed shortened from the suction side.
2.3.7. Choosing the thickness of the blades s
The thickness of the blades S is determined by technological considerations and durability, and sometimes the requirements of the wear resistance (for example, at Vesosov). The blades are specified near the entry to reduce the flow of flow (usually 2 times) S 1 T a b l and c a 2.1 To the choice of the thickness of the impeller of the impeller The widespread distribution of centrifugal pumps in everyday life and industry is due to their high performance characteristics and simplicity of the design. For the correct selection of the installation, consider the centrifugal pump device and the main types. In the helix-shaped unit of the unit on the shaft is the impeller (or several in multistage pumps). It represents the front and rear wheels (or only the rear), between which the blades are located. Purpose liquid with a suction (receiving) nozzle is supplied to the central part of the wheel. The shaft is driven by the electric motor. Water due to the centrifugal force is pushed out of the center of the impeller to its periphery. Thus, in the center of the wheel, a sparse space is created, a low pressure area. This contributes to the influx of new water. On the periphery of the impeller, on the contrary: water, being under pressure, seeks to exit through the injection (giving) nozzle into the pipeline. The impeller is one of the important parts of the centrifugal pump. Depending on the power of the unit and the place of its work, they differ: The shape of the blades affects the pressure of the water created by the unit. This is the most susceptible to damage during the operation part of the installation. It needs to be accurate balancing and centering. Materials from which the shaft is manufactured: Types of shafts: The principle of the centrifugal pump, as well as the diagram of the centrifugal pump is the same for all types of aggregates. It is based on the force effects of rotating blades on the flow of the pumped fluid with the transmission of mechanical energy from the working mechanism. Differences of the types of installations are in their power generated by water and execution.
Types of centrifugal pumps
Types of working wheels of the centrifugal pump
Shaft
