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The pulse tube is used to remove pressure, connecting pulse lines to flow regulators and pressure. In addition, this is another one inexpensive options Solutions for high temperatures of the measured medium. Each meter of the pulse tube lowers the temperature of the medium by about 80 degrees. Usually apply steel or copper pulse tubes. One end of the pulse tube, which attached to the pressure source, has the most convenient thread for mounting G1 / 2, and the other end connected to the sensor or the regulator has a thread corresponding to the car thread.
For example: for the convenience of installing pressure sensors, Aqua-Kip offers a pulse tube (copper) with threaded inside and external compounds Any length. Copper tube withstands pressure up to 87 bar and easily snacks, allowing it without much effort and an additional tool to lay it on the place from the point of pressure from the pressure to the instrument.
Characteristics:
Copper tube: 10x1
Pressure (MAX): 87 bar (30bar for threaded fittings)
Temperature: -25 + 210 s
Thread of accession to the process and to the device: G1 / 2, G1 / 4, G3 / 8 (when requesting, specify internal or external)
The cost is indicated for the pulse tube length of 1 meter and with a thread G1 / 2.
Length: 1 meter (we accept orders for the manufacture of tubes of any length, to calculate the cost and terms of manufacture, contact the managers of the company)
To obtain gas flows with super- and hypersonic speeds, in which the expiration of the operating gas comes from the closed volume - the forkamera. A diaphragm is installed in the dialing part of the nozzle (see Fig.), Separating the fork meter from the gas-dynamic path of the pipe. The forcamer is filled with compressed gas, the remaining elements of the pipe creates a vacuum (10-1 pa). As a result of a powerful electrical discharge of a capacitor battery or an inductive drive in the forkamera, the working gas is heated, its temperature and pressure rises to values T. 0 ≈ (3-5) * 10 3 K and p. 0 ≈ (2-3) * 10 8 Pa. After this, the diaphragm is broken, and the gas rushes through the nozzle into the working part and further into the vacuum container. The expiration of gas is accompanied by a drop in pressure and temperature in the forkamera, both due to the expansion of the gas and due to heat losses in the pipe wall, but in the working part during the working mode, it practically does not change over time and is determined mainly by the ratio of the space of the weekend and critical sections. nozzles. The duration of the operating mode (pulse - hence the name) in I. t. It is 50-100 ms, which is sufficient for various kinds of aerodynamic tests.
Small exposure time of dense high-temperature gas on the elements of the pipe and the model removes hard restrictions on the materials of the pipe and model designs and the measuring equipment, eliminates the use of complex systems Cooling and thus significantly simplifies and reduces the conduct of experiments.
IN I. t. We manage to get very large Reynolds numbers, so I. t. Allowed to test the models of aircraft in conditions close to the coat. However, the nonstationarity of the flow and pollution of the gas flow by the products of the destruction of the electrodes and walls of the forkamera limit the possibilities I. t.
A. L. Spark.
Encyclopedia "Aviation". - M.: Big Russian Encyclopedia. Spisching G.. 1998.
Watch what is a "impulse pipe" in other dictionaries:
Pulse trumpet - Aerodynamic tube to obtain gas flows with over and hypersonic speeds, in which the exhaustion of the working gas comes from the closed volume of the forkamera. In the dialing part of the nozzle, a diaphragm is installed separating the fork meter from ... ... Encyclopedia Technics
Pulse pipe diagram. The pulse pipe is an aerodynamic tube to obtain gas flows with over and hypersonic speeds, in which the exhaustion of the working gas comes from the closed volume - the forkamera. In the dialing part of the nozzle ... ... Encyclopedia "Aviation"
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Magnetic pulse welding - 46. Magnetically pulsed welding welding with pressure, in which the compound is carried out as a result of the collision of the welded parts, the source of the pulsed magnetic field: GOST 2601 84: Metal welding. Terms and ...
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The auxiliary reinforcement for pressure measurement devices includes such a device as a perkins tube, called otherwise pulsed tube for a pressure gauge or loop tube. It is intended for reliable protection The instrument from possible fluctuations in the measurement environment and from unnecessary heating. Using the tube, the temperature is lowered at the point of contact of the instrument with the system. In addition, the tube serves as an adapter from the manometer to the pipeline.
Condensation accumulates in the cavity of the pulse tube, which prevents the ingress of the measured high-temperature medium in the middle of the pressure gauge. Running a line to work, you need to make sure there is a coolant in the steel tube.
Perkins loop tube is used when measuring liquids and gaseous substancesnon-strong reagents. In this capacity and in the role of an intermediary between the devices and pipelines, the pulse tube is most economically favorable option Connections. Operation of such a tube can extend the life to the measuring instrument for many years. The optimal way to attach this type of reinforcement to the pipeline system is considered to use a threaded connection. In some cases, the compound is carried out using welding. Pulse tubes produce from various brands of high-quality steel. If there is a need to establish pressure sensors, then use them to install them copper tubes Perkins.
The pulse tube having an angular structure is used to install a measuring device and connecting to the pulse systems. Sometimes such tubes are made of brass. Straight loop tubes Apply in the same cases. General purpose of this additional equipment It is the oscillations of oscillations and pulsations in a measurable medium and preventing the glow of the pressure gauge.
On the pages of the company SoyuzPribor LLC, you will find devices for pressuring pressure, connecting sleeves, a variety of adapters for pressure gauges, rims, dampers, bolsters and other types of additional equipment.
Sleeve connecting
To create normal temperature conditions, a membrane separator compound with measuring instrument Must be carried out either through the connecting sleeve, or through the entrance tube, which is set by the consumer between the pressure take-off point and the separator.
Pressure converters Measuring pneumatic GSS are always connected to the separator by the sleeve.
It is allowed when mounting the separator with a connecting sleeve in height, while the error of the installation of the measuring device with the upper measurement limit to 1 mp, determined by the hydraulic pressure of the separation fluid column in the connecting sleeve, should be taken into account.
Standard sleeve connecting, model 55004, in the expanded state has a length of 2.5 meters.
Demmp
The damping device is resistant to the effects of ambient air from minus 55 to plus 70 ° C, with relative humidity from 30 to 80% on the entire temperature range, as well as resistant to the effects of a relative humidity of 95% at a temperature of 35 ° C (for execution of y) and relative humidity up to 100% at a temperature of 35 ° C (for execution T).
Valve block
Blocks valve BCdesigned to connect to lines with a measured medium of measuring instruments of excess and vacuum pressure. The blocks allow you to cut the devices from the lines without resetting the pressure of the measured environment, check the zero value of the instrument readings or produce pulse lines. For oxygen pressure dimension lines, degreasing parts in contact with the measured medium are degreed, and the designation "K" is set.
Adapters and couplings (bolsters)
Coupling I. adapter for manometer or thermometers are connecting (connective) reinforcement used in systems (pipelines) for transportation gaseous media and low viscosity liquids and non-crystallizing character. In essence, these products are additional (auxiliary) equipment.
Pulse tubes are auxiliary equipmentused with control and measuring instruments of the pipeline working environment - transducers, pressure gauges, pressure / vacuum sensors. Installation of the device is carried out on the process pipeline. It is allowed to connect to some automated system devices. The temperature of the working medium is reduced to the level necessary for interaction with the measuring equipment. Promotes a decrease in pressure bursts, eliminates vibration.
There are two versions of the design of pulsed tubes for connecting to the pipeline - threaded and welded. Thanks to this adaptation, the stability of control and measurement devices is increased to adverse climatic conditions, aggressive workers. It is widely used in areas of heatplets, as part of thermal items.
Pulse tubes are given pressure, provide a connection of devices that regulate the pressure and consumption of the working medium, with pulse line. Consider affordable way Measuring medium with high temperature (if the measuring and regulating equipment is not designed to work with high-temperature fluids).
The effectiveness of the device is determined by 1 meter long enough to reduce the temperature of 80 degrees. Common Production Materials - Copper, Steel. Table of dependence of the sizes of pulse tubes from the material:
One end tube is connected to the pipeline or the device with the working medium, the other to the measuring device. The carving part of the connection to the pressure source - G1 / 2, the sides of the connection to the sensor - according to the sensor thread.
The selection of the pulse tube is fully determined by the operating conditions and planned connections. Options are offered with internal and external threads, with different lengths. Typical copper modifications are capable of working with systems that have pressure within 87 bar (permissible pressure on sections with fittings - 30 bar), convenient for mounting. The softness of the material allows you to give the fitting the desired shape and pave the tube to the stationary placed controlling device (without using additional tools).
Standard tube length - meter, it is possible to manufacture modifications of any length, with any connection options. The acquisition of the device is possible even if the required length is unknown. A pipe is bought. Relatively larger lengths (with prepared compounds at the ends) are bought, the surpluses are trimmed during installation, the cuts are fixed by clamping fittings.
