CN206889237U - External characteristic test device of cryogenic pump with controllable medium phase change inducement - Google Patents
External characteristic test device of cryogenic pump with controllable medium phase change inducement Download PDFInfo
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- CN206889237U CN206889237U CN201720600227.9U CN201720600227U CN206889237U CN 206889237 U CN206889237 U CN 206889237U CN 201720600227 U CN201720600227 U CN 201720600227U CN 206889237 U CN206889237 U CN 206889237U
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Abstract
The utility model provides a medium phase transition lures because of controllable cryogenic pump external characteristic test device. In the device, a power system provides power for stable operation of the cryogenic pump; the pipeline system forms a low-temperature liquid circulation loop; the heat preservation and temperature regulation system ensures that the low-temperature medium in the whole device is not vaporized due to heat absorption from the outside and is used for regulating the temperature of the wall surface of the volute of the low-temperature pump; the in-tank pressure control system is used for controlling the pressure in the low-temperature tank so as to control the position where vaporization is generated; the data acquisition and analysis system is used for acquiring electric signals and image signals and analyzing data. Phase change under different inducements is realized by controlling the pressure in the tank, the flow rate of the cryogenic pump and the temperature of the wall surface of the volute, and the position of the phase change is judged according to an image shot by the high-speed camera, so that the test of the external characteristics of the cryogenic pump under four conditions of no phase change, phase change caused by pressure drop in the pump, phase change caused by hydraulic loss and phase change caused by external heat transfer is carried out.
Description
Technical field
A kind of cryogenic pump external characteristics experimental rig is the utility model is related to, the device is mainly used under different phase transformation inducements
The external characteristics of cryogenic pump and the measurement of internal flow.
Background technology
Cryogenic pump is the pump for being specifically used to transporting low temperature liquid.Because cryogenic pump is complicated, and the medium conveyed is easy
Vaporize, the motion of medium is sufficiently complex in cryogenic pump, and the design of pump at present is still by experience, or the semi-theoretical side of semiempirical
For formula come what is completed, these theoretical and experiences are all derived from scientific experimentation and production practices.Therefore, the experiment of cryogenic pump is for pump
Design, production and using all having great importance.The performance test of cryogenic pump can be not only the improvement and operation of product
Reliable technical basis is provided, the improvement of research and development, cryogenic pump performance also to cryogenic pump basic theory, design of cryopumps
Innovation of method etc. has extremely important effect.
The liquid gas of cryogenic pump conveying is easier to undergo phase transition than common water, and liquid gas produces phase transformation in cryogenic pump
Inducement can be divided into three classes：Pump internal drop causes phase transformation, hydraulic loss to cause phase transformation, ambient heat to cause phase transformation.
（1）Pump internal drop causes phase transformation.From the operation principle of centrifugal cryogenic pump, the pressure at impeller inlet is most
Low, if the pressure at this is reduced under the saturation pressure of liquid gas, phase will occur for liquid gas at impeller inlet
Become, that is, so-called cavitation phenomenons is produced, so as to have impact on the hydraulic performance of cryogenic pump.Therefore, exploring cryogenic pump internal drop causes
Phase transformation, the raising to cryogenic pump anti-cavitation performance have directive significance.
（2）Hydraulic loss causes phase transformation.It is well known that in the energy that pump is consumed, hydraulic loss mostly becomes
Heat so that medium temperature rises, and especially under low flow rate condition, the efficiency step-down of pump, the temperature of medium rises increase, so that
Nearby liquid gas is undergone phase transition impeller outlet, is run which limits cryogenic pump under low flow rate condition.Therefore, research and design
The cryogenic pump that operating mode operational efficiency is high and Effec-tive Function scope is wide, it is very to the ability for improving the operation of low temperature pump variable flow operating mode
It is necessary.
（3）Ambient heat causes phase transformation.Due to outside heat is incoming or pump in parts frictional heat can make it is local in pump
Liquid gas vaporizes, and when generation gas is more, can cause the hydraulic performance decline of pump or even be not normally functioning.Such as：Pump case is protected
Cold improper, liquid gas can be undergone phase transition in spiral case internal face in pump, meeting in the case that especially precooling is insufficient in pump startup
There is this phenomenon.Therefore, the ambient heat heating vaporization of cryogenic pump is studied, is disturbed improving the anti-ambient temperature of cryogenic pump
Ability it is significant.
Under different operating conditions, above-mentioned three kinds of phase transition phenomenas may occur in cryogenic pump, influence to some extent
The external characteristics of cryogenic pump.
The content of the invention
The blank of external characteristics measurement apparatus during in order to fill up cryogenic pump transporting low temperature liquid under difference phase transformation inducement, this reality
With a kind of controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement of new offer.The device peeps high-speed camera system in
The phase transformation situation that overall view observes, different phase transformation inducements is controlled, so as to measure the cryogenic pump external characteristics under different phase transformation inducements.
The utility model another object is to provide a kind of cryogenic pump external characteristics method of testing.
Technical scheme is as follows used by the utility model：
A kind of controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement, it is characterized in that：The device includes dynamical system
System, pipe-line system, temperature adjustment heat-insulation system, pressure inside the tank control system and data acquisition and analysis system；
The insulation thermoregulating system mainly includes cryogenic tank heat-insulation layer（35）, vacuum between cryogenic tank inner and outer wall
Heat-insulation layer, the vacuum layer in jacket pipe and the heat tape outside cryogenic pump pump case of pipeline periphery in layer, pipe-line system；
The data acquisition and analysis system include computer unit and be connected respectively with computer unit target type meter,
Pump inlet pressure sensor, pump discharge pressure sensor, speed probe, interior peep high-speed camera；
The pressure inside the tank control system mainly includes the pressure gauge of low temperature pot bottom（30）, the pressure at the top of cryogenic tank it is true
Empty table（3）, vavuum pump（31）With increase pump（32）And the valve and pipeline being connected with them, the pressure gauge of low temperature pot bottom
（30）By separating ball valve（29）It is connected with cryogenic tank bottom nozzles, the pressure vacuum meter at the top of cryogenic tank（3）Be arranged on into
In liquid pipe；Vavuum pump（31）By depressurizing pressure regulator valve（38）, air intake duct（40）With cut-off air valve（42）With feed tube（43）It is connected
Connect；Booster pump（32）By being pressurized pressure regulator valve（39）, gas tube（41）With cut-off air valve（42）With feed tube（43）It is connected.
The further design of the utility model device is：
Described cryogenic tank uses spherical structure, bottom nozzles is arranged right below in cryogenic tank, directly over cryogenic tank
Taken over provided with top, the feed tube and the angle of surface adapter in the top of cryogenic tank are 15 °；Cryogenic pump position is less than
Liquid level position in cryogenic tank.
Cryopump inlet pipeline in the pipe-line system is horizontally disposed, is left before pump inlet straight not less than 20 times of calibers
Pipeline section, cryogenic pump export pipeline are arranged vertically, wherein the straight length not less than 20 times of calibers is left before target type meter, target formula
The straight length not less than 5 times of calibers is left after flowmeter.
At least corresponded on the shell of the cryogenic pump spiral case wall, set first at impeller inlet, at impeller outlet respectively,
Second, third spy testing hole, each spy testing hole that each endoscope opens up from cryogenic pump are stretched into cryogenic pump, it is each in peep
Mirror first, second, third high-speed camera of corresponding connection, the output port of each high-speed camera are connected with computer unit respectively
Connect.
Described target-type flow（10）Meter is located at pump discharge straight length（12）On, pump inlet pressure sensor（24）Located at pump
Import straight length（25）Upper close pump inlet end, pump discharge pressure sensor（13）Located at pump discharge straight length（12）Upper close pump
The port of export, on the motor, flowmeter and sensor are connected speed probe with computer unit respectively.
Cryogenic pump external characteristics method of testing based on above-mentioned experimental rig, the cryogenic pump external characteristics test point without phase transformation,
Pump internal drop causes the test that phase transformation, hydraulic loss cause phase transformation, ambient heat to cause four kinds of situations of phase transformation, in the case of each phase transformation
The step of distinguish it is as follows：
Step 1：Fill liquid nitrogen
Step 2：Precooling pipeline
Step 3：Operating condition of test is presetting
3.1）Open all the sensors in data acquisition and analysis system and interior peep high-speed camera, it is ensured that all the sensors
On signal can be transmitted correctly to computer unit（11）；
3.2）The regulating valve for system of blinding off a line（9）, start motor（17）Open cryogenic pump（19）；
3.3）Regulation motor（17）Rotating speed to test needed for rotating speed；
3.4）Observe target type meter in pipe-line system（10）Institute's measurement of discharge, slowly opens regulating valve（9）, by Flow-rate adjustment
To flow needed for experiment；
3.5）Observe to peep high-speed camera in each and survey in pump and flow, without phase transformation in controlling pump；If go out at impeller inlet
Existing phase transition phenomena, then close the liquid feed valve of feed tube（2）, decompression pressure regulator valve（38）, open cut-off air valve（42）, supercharging pressure regulator valve
（39）, open booster pump（32）To cryogenic tank（37）Interior supercharging；Observe pressure vacuum meter（3）Reading change, it is ensured that cryogenic tank
（37）Interior pressure is no more than design pressure；High-speed camera is peeped in observation second（21-2）Flowed in institute's survey pump, until impeller enters
Without phase transition phenomena at mouthful；Cut-off ball valve is must shut off before supercharging（29）, avoid hypertonia from exceeding pressure gauge（30）Range；
Step 4：After above-mentioned steps, the test of following four kinds of situations is carried out respectively
First, the cryogenic pump external characteristics experiment of no phase transformation situation
1）In pump without phase transformation in the case of, treat cryogenic pump（19）Data needed for collection after stable, through computer list
Member（11）Cryogenic pump is obtained after processing（19）External characteristics；
Second, pump internal drop causes the cryogenic pump external characteristics in the case of phase transformation to be tested
1）High-speed camera is peeped in observation second（21-2）Flowed in institute's survey pump；
2）Close liquid feed valve on feed tube（2）With supercharging pressure regulator valve（39）, open cut-off air valve（42）With decompression pressure regulator valve
（38）, start vavuum pump（31）To cryogenic tank（37）Interior decompression；Observe pressure vacuum meter（3）Reading change, observation second in
Peep high-speed camera（21-2）Flowed in institute's survey pump, allow impeller inlet to undergo phase transition；
3）If impeller inlet is undergone phase transition in the case of not depressurizing, take and step 3.5）Identical method, control
Cryogenic tank（37）Interior pressure controls the purpose of impeller inlet phase transformation to reach；
4）In the case of being undergone phase transition at impeller inlet, keep low temperature pressure inside the tank constant, treat cryogenic pump（19）Operation
Data needed for collection after stable, through computer unit（11）Cryogenic pump is obtained after processing（19）External characteristics；
3rd, hydraulic loss causes the cryogenic pump external characteristics in the case of phase transformation to be tested
1）Turn down the regulating valve of pipe-line system（9）Reduce cryogenic pump（19）Flow；Observe in the 3rd and peep high-speed camera
（21-3）Flowed in institute's survey pump, now, hydraulic loss increase in pump, the energy of loss causes impeller outlet liquid nitrogen temperature liter nearby
It is high and undergo phase transition；
2）High-speed camera is peeped in observation second（21-2）Flowed in institute's survey pump, it is ensured that impeller entrance under this flow rate working conditions
Without phase transition phenomena；If phase transition phenomena at impeller inlet be present, can take and step 3.5）Identical method, carry out Stress control；
3）In the case where hydraulic loss causes to undergo phase transition near impeller outlet, low temperature pump discharge and cryogenic tank pressure are kept
Power is constant, treats cryogenic pump（19）Data needed for collection after stable, through computer unit（11）Cryogenic pump is obtained after processing
（19）External characteristics；
4th, ambient heat causes the cryogenic pump external characteristics in the case of phase transformation to be tested
1）High-speed camera is peeped in observation second（21-2）With the 3rd in peep high-speed camera（21-3）Flowed in institute's survey pump,
Ensure that impeller inlet and impeller outlet nearby occur without phase transition phenomena, i.e., without phase transformation caused by pump internal drop and hydraulic loss；
2）To heat tape（20）It is powered, to cryogenic pump（19）Volute outer wall heated, simulation effect of heat insulation it is bad
With the situation of ambient heat；
3）High-speed camera is peeped in observation first（21-1）Flowed in institute's survey pump, be heated to cryogenic pump spiral case inwall and phase occur
Become；If impeller inlet has phase transition phenomena, can take and step 3.5）Identical method, Stress control is carried out, to eliminate impeller
Entrance phase transformation；
4）Keep low temperature pump discharge, low temperature pressure inside the tank and heat tape heating-up temperature constant, treat cryogenic pump（19）Fortune
Data needed for collection after row is stable, through computer unit（11）Cryogenic pump is obtained after processing（19）External characteristics；
Step 5：Terminate experiment.
The further design of the utility model method is：
In this method step 1, filling liquid nitrogen detailed process is as follows：
1.1）Close ball valve（26）With cut-off air valve（42）, open cut-off ball valve（29）, air bleeding valve（5）And liquid feed valve（2）；
1.2）From inlet（1）Through liquid feed valve（2）And feed tube（43）To cryogenic tank（37）Inside first it is slowly injected into liquid nitrogen, liquid
Nitrogen after nitrogen vaporization at the top of cryogenic tank through taking over（4）And air bleeding valve（5）From exhaust outlet（6）Discharge；
1.3）Treat exhaust outlet（6）After being discharged without nitrogen, increase liquid nitrogen filling flow；
1.4）In filling process, pressure gauge is observed（30）On reading change, until cryogenic tank（37）Interior liquid nitrogen level reaches
To 2/3 spherical tank height；
1.5）Stop liquid nitrogen filling, liquid nitrogen filler pipe is from inlet（1）Remove, close air bleeding valve（5）.
Precooling pipeline detailed process is as follows in this method step 2：
2.1）Open regulating valve（9）, slowly open ball valve（26）, precooling pipeline and cryogenic pump；Nitrogen after liquid nitrogen vaporization
Through cryopump inlet pipeline, cryogenic pump（19）, cryogenic pump export pipeline, take at the top of cryogenic tank（4）, feed tube（43）, feed liquor
Valve（2）From inlet（1）Discharge；
2.2）Standard-sized sheet ball valve（26）, close regulating valve（9）；
2.3）Manual disk turns shaft coupling（16）, it is ensured that pump shaft is not stuck；
2.4）Start motor（17）；
2.5）Slowly open regulating valve（9）, to the further precooling of pipeline；Nitrogen after liquid nitrogen vaporization is through bend pipe（8）, chuck
Pipe（7）, take at the top of cryogenic tank（4）, feed tube（43）, liquid feed valve（2）From inlet（1）Discharge；
2.6）After the completion for the treatment of whole pipeline precooling, cryogenic pump is closed（19）；
2.7）Check pressure gauge（30）Reading, it is ensured that cryogenic tank（37）Interior liquid level is not less than the 3/5 of spherical tank height；
2.8）If cryogenic tank（37）Interior liquid level is relatively low, opens air bleeding valve（5）, again from inlet（1）Fill liquid nitrogen, filling
After the completion of, liquid nitrogen filler pipe is from inlet（1）Remove, close air bleeding valve（5）.
It is as follows to terminate experiment detailed process in this method step 5：
5.1）Close motor（17）So that cryogenic pump（19）It is out of service；
5.2）Open liquid feed valve（2）, air bleeding valve（5）, regulating valve（9）, cut-off ball valve（29）, close ball valve（26）, cut-off
Air valve（42）；If for a long time without testing, after the liquid nitrogen vaporization in pipeline, through bend pipe（8）, jacket pipe（7）, at the top of cryogenic tank
Adapter（4）, feed tube（43）, liquid feed valve（2）From inlet（1）Discharge, or through bend pipe（8）, jacket pipe（7）, at the top of cryogenic tank
Adapter（4）, air bleeding valve（5）From exhaust outlet（6）Discharge；Cryogenic tank（37）In liquid nitrogen vaporization after, through feed tube（43）, liquid feed valve
（2）From inlet（1）Discharge, or through being taken at the top of cryogenic tank（4）, air bleeding valve（5）From exhaust outlet（6）Discharge；
5.3）The all the sensors closed in data acquisition and analysis system and it is interior peep high-speed camera, repairing experiment scene.
Said structure of the present utility model is described as follows below：
Dynamical system：Power is provided for the stable operation of cryogenic pump.
Motor and cryogenic pump are fixed in frame by bolt, connected between motor and cryogenic pump using shaft coupling
Connect.Magnetoelectric tachometric transducer is installed on motor, measures the rotating speed of cryogenic pump.Motor provides power for the operation of cryogenic pump,
The regulation of rotating speed is realized by frequency converter, to carry out the research of pump performance under different rotating speeds.
Pipe-line system：A cryogenic liquid circulation loop is formed, ensures that there is the device high measurement accuracy and safety to transport
OK.
The inlet and outlet of cryogenic pump are connected with reducer pipe, and for the connection of different size pipelines, one section of installation is soft after reducer pipe
Pipe, to compensate alignment error and offset thermal stress caused by pipeline.
The straight length not less than 20 times of calibers is left before cryopump inlet, ensures that pump intake incoming is uniformly distributed.
The straight length not less than 20 times of calibers is left before target type meter, not less than 5 times calibers are left after target type meter
Straight length, ensure the precision of flow measurement.
The installation site of cryogenic pump is less than the position of low temperature tank level, and pot liquid automatically flows into pump under gravity
It is interior, fill the trouble that pump is brought before saving low temperature pump operation.
It is incubated thermoregulating system：Whole pipe-line system and extraneous heat transfer are avoided, is ensured low in whole pipe-line system
Warm medium from external world's heat absorption because not vaporizing；Adjust the spiral case wall surface temperature of cryogenic pump, the position that control vaporization occurs.
All straight lengths in pipe-line system use vacuum clip sleeve pipe, heat-insulation layer are wrapped on jacket pipe, to reduce heat
Transmit.
Other accessories in pipe-line system（Such as：Target type meter, regulating valve, ball valve, flange, bend pipe, flexible pipe etc.）Table
Face wraps heat-insulation layer, and insulation layer material is polyurethane foam, and cryogenic pump the import and export pipeline is incubated.
Cryogenic tank uses spherical structure, and the structure has the characteristics of surface area minimum in the case of same volume, is dissipated with reducing
The area of heat.Vacuumized between cryogenic tank inner and outer wall, to reduce heat transfer caused by heat transfer.Guarantor is wrapped outside cryogenic tank
Warm layer, insulation layer material are polyurethane foam, to strengthen the heat insulation effect to cryogenic tank.Heat-insulation layer peripheral hardware matcoveredn is to insulation
Layer is protected.
Cryogenic pump spiral case wall is provided with heat tape, lays heat-insulation layer outside heat tape, insulation material is polyurethane foam.
In the case where not allowing spiral case internal face to vaporize, heat tape does not work, and heat-insulation layer plays insulation effect, avoids and the external world
Generation heat exchange；Needing to simulate cryogenic pump in the case of being vaporized with ambient heat, heat tape energization work, adding
Hot cryogenic pump spiral case wall.
Pressure inside the tank control system：The pressure in cryogenic tank is controlled, to control the position that generation is vaporized in cryogenic pump.
The pressure gauge of low temperature pot bottom is used to measure tank bottom pressure, so as to convert to obtain liquid level in tank, during experiment
The cut-off ball valve being connected with the pressure gauge is closed, pressure gauge is damaged to avoid no to scale.
Pressure vacuum meter at the top of cryogenic tank is used to measure the pressure in cryogenic tank.When cryogenic tank needs decompression, close
It is all to be evacuated out of cryogenic tank, shown by the pressure vacuum meter in cryogenic tank with the valve of extraneous connection, opening vavuum pump
Vacuum, the pressure size in tank are adjusted by decompression valve；When needed in cryogenic tank supercharging when, close it is all with it is outer
The valve of boundary's connection, opens booster pump and is inflated into cryogenic tank, the pressure in cryogenic tank is shown by the pressure vacuum meter, in tank
Pressure size be adjusted by boost pressure regulation valve.
Data acquisition and analysis system：For gathering the signals such as pressure, rotating speed, flow, electric current, voltage, the number of collection is analyzed
According to the external characteristics for drawing cryogenic pump；And the image of the cryogenic pump internal flow obtained for gathering high-speed camera to shoot, according to
Flow regime controls low temperature pressure inside the tank or the outer heat tape temperature of cryogenic pump, to ensure external characteristics experiment in required phase transformation
Carried out under inducement.
The system is using computer unit as core, and sensor is by various measured parameters（Such as：The stream of pump inlet and outlet pressure, pump
Amount, rotating speed etc.）Analog signal is converted into, is amplified or decayed by amplifier, and digital quantity is converted into through A/D converter,
It is connected by input interface with computer unit., can be to measured parameter through Software for Design by computer unit during experiment
Circling measurment, collection, storage are carried out, and flow, lift, efficiency, shaft power, net positive suction head etc. are calculated according to correlation formula
Pump external characteristics.Result of the test can be provided in the form of data, form, curve or fitting formula by printer.
Target type meter is installed in pump discharge pipe-line system, the flowmeter can accurately measure the stream of cryogenic liquid
Amount.
Magnetoelectric tachometric transducer is installed on motor, measures the rotating speed of low temperature pump shaft.
The shaft power of cryogenic pump is measured with electrical measuring method, and potentiometer and galvanometer are connected on motor, and motor is recorded with computer
Electric current and voltage, then obtain by no-load test and load test that size is lost, the shaft power of cryogenic pump be calculated.
Pressure sensor is installed on the straight length of cryogenic pump the import and export pipeline, measures cryogenic pump inlet and outlet pressure.
According to above-mentioned measurement data, it is computed can obtain the external characteristics of cryogenic pump（Flow, lift, shaft power, efficiency, vapour
Lose surplus）.
Endoscope is stretched into cryogenic pump from spy testing hole, flowing in pump is shot by high-speed camera, data
Incoming computer unit carries out Treatment Analysis.
Compared with prior art, its apparatus and method has the advantages that the utility model respectively：
（1）The a set of novel device for being used for measurement and cryogenic pump external characteristics in the case of phase transformation being present of the utility model design, should
Phase transformation inducement is controllable in device pump.By the temperature for adjusting the flow of cryogenic pump, the pressure in cryogenic tank and cryogenic pump spiral case wall
Spend to control phase transformation inducement, realize that pump internal drop causes phase transformation, hydraulic loss to cause phase transformation, ambient heat to cause phase transformation respectively,
Cryogenic pump external characteristics in the case of every kind of phase transformation is tested.
（2）It is easy to operate, safe and reliable.Whole device uses reliable heat insulation layer structure, avoids the cold of cryogenic liquid
The loss of amount, while serve the effect for preventing frostbite；Cryogenic tank uses spherical structure, the structure in the case of same volume
Area of dissipation is minimum；Pipeline arrangement is optimal, and pipe is reduced as far as possible in the case where ensureing not influenceing flow and pressure measurement accuracy
Road length, so as to reduce the area of dissipation of pipeline；Cryogenic pump is arranged in the lower section of low temperature tank level, eliminates cryogenic pump and opens
This operating procedure of filling pump when dynamic.
（3）Measurement accuracy is high.Performance that can be directly using cryogenic liquid as medium direct measurement cryogenic pump, is avoided
Unnecessary error, the test accuracy of device are high.
（4）It is versatile.When testing different model cryogenic pump, the import and export pipeline connects difference using reducer pipe
The cryogenic pump of model.
（5）It is multiple functional.The device can not only measure the external characteristics of cryogenic pump, moreover it is possible to measure in cryogenic pump phase change location and
Internal flow state.
（6）Method of testing of the present utility model is controlled by phase transformation inducement, and method of testing of the present utility model can be realized low
Warm pump is to cause phase transformation, hydraulic loss to cause phase transformation, ambient heat to cause without phase transformation, pump internal drop outer under four kinds of situations of phase transformation
The experiment of characteristic, it is easy to use, it can effectively carry out cryogenic pump performance detection and analysis in the case of different phase transformations.
Brief description of the drawings
The utility model is further illustrated with example below in conjunction with the accompanying drawings.
Fig. 1 is general assembly structural representation of the present utility model.
In figure：1. inlet, 2. liquid feed valves, 3. pressure vacuum meters, 4. cryogenic tanks top are taken over, 5. air bleeding valves, 6. exhausts
Mouthful, 7. jacket pipes, 8. bend pipes, 9. regulating valves, 10. target type meters, 11. computer units, 12. pump discharge straight lengths, 13. pumps
Outlet pressure sensor, 14. pump discharge flexible pipes, 15. pump discharge reducer pipes, 16. shaft couplings, 17. motors, 18. frames, 19. is low
Warm pump, 20. heat tapes, high-speed camera is peeped in 21-1. first, peep high-speed camera in 21-2. second, in 21-3. the 3rd
Peep high-speed camera, 22. pump inlet reducer pipes, 23. pump inlet flexible pipes, 24. pump inlet pressure sensors, 25. pump inlet straight tubes
Section, 26. ball valves, 27. bend pipes, 28. cryogenic tank bottom nozzles, 29. cut-off ball valves, 30. pressure gauges, 31. vavuum pumps, 32. superchargings
Pump, 33. low temperature top tank structures, 34. low temperature tank walls, 35. cryogenic tank heat-insulation layers, 36. protective layers, 37. cryogenic tanks, 38. decompressions are adjusted
Pressure valve, 39. supercharging pressure regulator valves, 40. air intake ducts, 41. gas tubes, 42. cut-off air valves, 43. feed tubes.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings：
Embodiment one：
In Fig. 1, device of the present utility model includes five systems, respectively dynamical system, pipe-line system, temperature adjustment insulation
System, pressure inside the tank control system and data acquisition and analysis system.The experimental rig can control phase transformation inducement in cryogenic pump
In the case of, carry out the test of the external characteristics of cryogenic pump.
In Fig. 1, dynamical system of the present utility model includes motor（17）, shaft coupling（16）, frame（18）, cryogenic pump
（19）.Motor（17）Pass through shaft coupling（16）With cryogenic pump（19）Connection, cryogenic pump is transmitted to by power（19）, motor（17）With it is low
Warm pump（19）It is fixed on frame（18）On.
In Fig. 1, pipe-line system of the present utility model includes cryogenic tank（37）, pump inlet pipeline and pump discharge pipeline.It is low
Warm tank（37）For containing liquid nitrogen, cryogenic tank bottom nozzles（28）It is connected with pump inlet pipeline, is taken at the top of cryogenic tank（4）With
Pump discharge pipeline is connected.Pump inlet pipeline entrance point and cryogenic tank bottom nozzles（28）It is connected, through bend pipe（27）, ball valve
（26）, pump inlet straight length（25）, pump inlet flexible pipe（23）, pump inlet reducer pipe（22）It is continuously connected to cryogenic pump（19）Enter
Mouthful.Pump discharge pipeline entrance point and cryogenic pump（19）The port of export is connected, through pump discharge reducer pipe（15）﹑ pump discharge flexible pipes
（14）, pump discharge straight length（12）, target type meter（10）, regulating valve（9）, bend pipe（8）, jacket pipe（7）It is continuously connected to low
Warm tank top adapter（4）.Regulating valve（9）For adjusting the flow of cryogenic pump.Flexible pipe is installed in cryogenic pump the import and export pipeline
（23、14）, for compensating alignment error and offsetting thermal stress caused by pipeline.Cryogenic pump（19）Import and export and reducer pipe
（22、15）It is connected, the connection for different size pipelines.
In Fig. 1, insulation thermoregulating system of the present utility model includes cryogenic tank heat-insulation layer（35）, low temperature top tank structure（33）With
Outer wall（34）Between vacuum layer, in pipe-line system pipeline periphery heat-insulation layer（It is not drawn into figure）, all jacket pipes（7）Interior
Heat tape outside vacuum layer, cryogenic pump pump case（20）.All vacuum layers and heat-insulation layer be for avoiding cryogenic media with it is outer
Boundary carries out heat exchange.Heat tape（20）For adjusting the temperature of cryogenic pump spiral case wall.
In Fig. 1, pressure inside the tank control system of the present utility model includes the pressure gauge of low temperature pot bottom（30）, cryogenic tank
The pressure vacuum meter at top（3）, vavuum pump（31）, increase pump（32）, decompression pressure regulator valve（38）, supercharging pressure regulator valve（39）And cut-off
Air valve（42）, and vavuum pump（31）, booster pump（32）With feed tube（43）Between connecting line, be mainly used in control low temperature
Pump（19）The position that interior vaporization occurs.The pressure gauge of low temperature pot bottom（30）For measuring tank bottom pressure, obtained with conversion in tank
Liquid level.Pressure vacuum meter at the top of cryogenic tank（3）For measuring the pressure in cryogenic tank.Depressurize pressure regulator valve（38）With supercharging pressure regulation
Valve（39）For controlling cryogenic tank（37）Interior pressure.
In Fig. 1, data acquisition and analysis system of the present utility model includes computer unit（11）Respectively with computer
The target type meter of unit connection（10）, pump inlet pressure sensor（24）, pump discharge pressure sensor（13）, it is interior peep at a high speed take the photograph
Camera（21-1、21-2、21-3）Deng.Target type meter（10）For measuring the flow of cryogenic pump, pump inlet pressure sensor
（24）With pump discharge pressure sensor（13）It is respectively used to the pressure of measuring pump inlet and outlet.Inside peep high-speed camera（21-1、21-
2、21-3）The position and flow regime of observing cryogenic pump in medium vaporization occur is stretched into cryogenic pump by endoscope.Collect
Data input computer unit（11）Analyzed and processed, obtain the external characteristics of cryogenic pump.In this example, in the outer of cryogenic pump
Corresponded on shell at impeller inlet, at impeller outlet and three on spiral case wall at open up endoscope measured hole, and in being separately installed with
Sight glass and interior peep high-speed camera.
Embodiment two：
Without the cryogenic pump external characteristics experiment in the case of phase transformation（By controlling low temperature pressure inside the tank to realize）Key step：
1）Fill liquid nitrogen.
1.1）Close ball valve（26）With cut-off air valve（42）, open cut-off ball valve（29）, air bleeding valve（5）And liquid feed valve（2）.
1.2）From inlet（1）Through liquid feed valve（2）And feed tube（43）To cryogenic tank（37）Inside first it is slowly injected into liquid nitrogen, liquid
Nitrogen after nitrogen vaporization at the top of cryogenic tank through taking over（4）And air bleeding valve（5）From exhaust outlet（6）Discharge.
1.3）Treat exhaust outlet（6）After being discharged without nitrogen, increase liquid nitrogen filling flow.
1.4）In filling process, pressure gauge is observed（30）On reading change, until cryogenic tank（37）Interior liquid nitrogen level reaches
To 2/3 spherical tank height.
1.5）Stop liquid nitrogen filling, liquid nitrogen filler pipe is from inlet（1）Remove, close air bleeding valve（5）.
2）Precooling pipeline.
2.1）Open regulating valve（9）, slowly open ball valve（26）, precooling pipeline and cryogenic pump.Nitrogen after liquid nitrogen vaporization
Through cryopump inlet pipeline, cryogenic pump（19）, cryogenic pump export pipeline, take at the top of cryogenic tank（4）, feed tube（43）, feed liquor
Valve（2）From inlet（1）Discharge.
2.2）Standard-sized sheet ball valve（26）, close regulating valve（9）.
2.3）Manual disk turns shaft coupling（16）, it is ensured that pump shaft is not stuck.
2.4）Start motor（17）.
2.5）Slowly open regulating valve（9）, to the further precooling of pipeline.Nitrogen after liquid nitrogen vaporization is through bend pipe（8）, chuck
Pipe（7）, take at the top of cryogenic tank（4）, feed tube（43）, liquid feed valve（2）From inlet（1）Discharge.
2.6）After the completion for the treatment of whole pipeline precooling, cryogenic pump is closed（19）.
2.7）Check pressure gauge（30）Reading, it is ensured that cryogenic tank（37）Interior liquid level is not less than the 3/5 of spherical tank height.
2.8）If cryogenic tank（37）Interior liquid level is relatively low, opens air bleeding valve（5）, again from inlet（1）Fill liquid nitrogen, filling
After the completion of, liquid nitrogen filler pipe is from inlet（1）Remove, close air bleeding valve（5）.
3）Operating condition of test is presetting and without the cryogenic pump external characteristics experiment in the case of phase transformation
3.1）Open all the sensors in data acquisition and analysis system and interior peep high-speed camera, it is ensured that all the sensors
On signal can be transmitted correctly to computer unit（11）.
3.2）Close regulating valve（9）, start motor（17）Open cryogenic pump（19）.
3.3）Pass through frequency converter regulation motor（17）Rotating speed to test needed for rotating speed.
3.4）Observe target type meter（10）Institute's measurement of discharge, slowly opens regulating valve（9）, by needed for Flow-rate adjustment to experiment
Flow.
3.5）Observe to peep high-speed camera in each and survey in pump and flow, without phase transformation in controlling pump.In the abundant precooling of pipeline and
The larger situation of flow, if occurred at impeller inlet without phase transformation, other positions will not be undergone phase transition, as long as so control leaf
Wheel entrance can ensure that everywhere without phase transformation without phase transformation.If occurring phase transition phenomena at impeller inlet, feed tube is closed
Liquid feed valve（2）, decompression pressure regulator valve（38）, open cut-off air valve（42）, supercharging pressure regulator valve（39）, open booster pump（32）To low temperature
Tank（37）Interior supercharging；Observe pressure vacuum meter（3）Reading change, it is ensured that cryogenic tank（37）Interior pressure is no more than design pressure；
High-speed camera is peeped in observation second（21-2）Flowed in institute's survey pump, until without phase transition phenomena at impeller inlet；It is necessary before supercharging
Close cut-off ball valve（29）, avoid hypertonia from exceeding pressure gauge（30）Range.
3.6）In pump without phase transformation in the case of, treat cryogenic pump（19）Data needed for collection after stable, through computer
Unit（11）Cryogenic pump is obtained after processing（19）External characteristics.
4）Terminate experiment.
4.1）Close motor（17）So that cryogenic pump（19）It is out of service.
4.2）Open liquid feed valve（2）, air bleeding valve（5）, regulating valve（9）, cut-off ball valve（29）, close ball valve（26）, cut-off
Air valve（42）.If for a long time without testing, after the liquid nitrogen vaporization in pipeline, through bend pipe（8）, jacket pipe（7）, at the top of cryogenic tank
Adapter（4）, feed tube（43）, liquid feed valve（2）From inlet（1）Discharge, or through bend pipe（8）, jacket pipe（7）, at the top of cryogenic tank
Adapter（4）, air bleeding valve（5）From exhaust outlet（6）Discharge；Cryogenic tank（37）In liquid nitrogen vaporization after, through feed tube（43）, liquid feed valve
（2）From inlet（1）Discharge, or through being taken at the top of cryogenic tank（4）, air bleeding valve（5）From exhaust outlet（6）Discharge.
4.3）The all the sensors closed in data acquisition and analysis system and it is interior peep high-speed camera, repairing experiment scene.
Embodiment three：
Pump internal drop causes the cryogenic pump external characteristics in the case of phase transformation to be tested（By controlling low temperature pressure inside the tank to realize）'s
Key step：
1）With the 1.1 of embodiment two）To 3.5）Step is identical.
2）Close liquid feed valve（2）With supercharging pressure regulator valve（39）, open cut-off air valve（42）With decompression pressure regulator valve（38）, start
Vavuum pump（31）To cryogenic tank（37）Interior decompression.Observe pressure vacuum meter（3）Reading change, observation second in peep high-speed camera
Machine（21-2）Flowed in institute's survey pump, allow impeller inlet to undergo phase transition, peep what high speed camera photographed from interior in the case of this kind of phase transformation
It can be seen that there is bubble at this on image.
3）If impeller inlet is undergone phase transition in the case of not depressurizing, take and step 3.5）Identical method, control
Cryogenic tank（37）Interior pressure controls the purpose of impeller inlet phase transformation to reach.
4）In the case of sending out phase transformation at impeller inlet, low temperature pressure inside the tank is kept constant more than 10 minutes, treat cryogenic pump
（19）Data needed for collection after stable, through computer unit（11）Cryogenic pump is obtained after processing（19）External characteristics.Data
After collection terminates, recover low temperature pressure inside the tank, eliminate impeller inlet phase transformation.
5）Terminate experiment, step with embodiment two 4）Step.
Example IV：
Hydraulic loss causes the cryogenic pump external characteristics in the case of phase transformation to be tested（By controlling low temperature pressure inside the tank and cryogenic pump
Flow is realized）Key step：
1）With the 1.1 of embodiment two）To 3.5）Step is identical.
2）Turn down regulating valve（9）Reduce cryogenic pump（19）Flow.Observe in the 3rd and peep high-speed camera（21-3）Surveyed
Flowed in pump, now, hydraulic loss increase in pump, the energy of loss causes impeller outlet liquid nitrogen temperature rise nearby and phase occurs
Become, it can be seen that there is bubble near impeller outlet from the interior image peeped high speed camera and photographed in the case of this kind of phase transformation.
3）High-speed camera is peeped in observation second（21-2）Flowed in institute's survey pump, it is ensured that impeller entrance under this flow rate working conditions
Without phase transition phenomena.If phase transition phenomena at impeller inlet be present, can take and step 3.5）Identical method is appropriate to carry out pressure control
System.
4）In the case where hydraulic loss causes to undergo phase transition near impeller outlet, low temperature pump discharge and cryogenic tank pressure are kept
Constant more than 10 minutes of power, treats cryogenic pump（19）Data needed for collection after stable, through computer unit（11）After processing
To cryogenic pump（19）External characteristics.After data acquisition terminates, big regulating valve is opened（9）Increase cryogenic pump（19）Flow to specified stream
Amount, eliminate phase transformation.
5）Terminate experiment, step with embodiment two 4）Step.
Embodiment five：
Ambient heat causes the cryogenic pump external characteristics in the case of phase transformation to be tested（By controlling low temperature pressure inside the tank and electrical heating
Band heating-up temperature is realized）Key step：
1）With the 1.1 of embodiment two）To 3.5）Step is identical.
2）High-speed camera is peeped in observation second（21-2）With the 3rd in peep high-speed camera（21-3）Flowed in institute's survey pump,
Ensure that impeller inlet and impeller outlet nearby occur without phase transition phenomena, i.e., without phase transformation caused by pump internal drop and hydraulic loss；
3）To heat tape（20）It is powered, to cryogenic pump（19）Volute outer wall heated, simulation heat insulation effect it is bad
With the situation of ambient heat.
4）High-speed camera is peeped in observation first（21-1）Flowed in institute's survey pump, be heated to cryogenic pump spiral case inwall and phase occur
Become, it can be seen that spiral case wall forms bubble from the interior image peeped high speed camera and photographed in the case of this kind of phase transformation.If leaf
Be present phase transition phenomena in wheel import, can take and step 3.5）Identical method, suitably carry out Stress control.
5）Low temperature pump discharge, low temperature pressure inside the tank and constant more than 10 minutes of heat tape heating-up temperature are kept, is treated low
Warm pump（19）Data needed for collection after stable, through computer unit（11）Cryogenic pump is obtained after processing（19）External characteristics.
After data acquisition terminates, to heat tape（20）Power-off, eliminate spiral case inwall phase transformation.
6）Terminate experiment, step with embodiment two 4）Step.
Claims (5)
1. a kind of controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement, it is characterized in that：The device include dynamical system,
Pipe-line system, temperature adjustment heat-insulation system, pressure inside the tank control system and data acquisition and analysis system；
The insulation thermoregulating system mainly includes cryogenic tank heat-insulation layer（35）, the vacuum layer between cryogenic tank inner and outer wall, pipe
The heat-insulation layer of pipeline periphery, the vacuum layer in jacket pipe and the heat tape outside cryogenic pump pump case in the system of road；
Target type meter, the pump that the data acquisition and analysis system includes computer unit and is connected respectively with computer unit enter
Mouth pressure sensor, pump discharge pressure sensor, speed probe, high-speed camera；
The pressure inside the tank control system mainly includes the pressure gauge of low temperature pot bottom（30）, pressure vacuum meter at the top of cryogenic tank
（3）, vavuum pump（31）And booster pump（32）And the valve and pipeline being connected with them, the pressure gauge of low temperature pot bottom（30）
By separating ball valve（29）It is connected with cryogenic tank bottom nozzles, the pressure vacuum meter at the top of cryogenic tank（3）Installed in feed tube
On；Vavuum pump（31）By depressurizing pressure regulator valve（38）, air intake duct（40）With cut-off air valve（42）With feed tube（43）It is connected；Increase
Press pump（32）By being pressurized pressure regulator valve（39）, gas tube（41）With cut-off air valve（42）With feed tube（43）It is connected.
2. the controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement according to claim 1, it is characterized in that：It is described
Cryogenic tank use spherical structure, be arranged right below bottom nozzles in cryogenic tank, directly over cryogenic tank be provided with top take over,
Feed tube and the angle of surface adapter in the top of cryogenic tank are 15 °；Cryogenic pump position is less than low temperature tank level
Position.
3. the controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement according to claim 1, it is characterized in that：It is described
Cryopump inlet pipeline in pipe-line system is horizontally disposed, and the straight length not less than 20 times of calibers, cryogenic pump are left before pump inlet
Export pipeline is arranged vertically, wherein leaving the straight length not less than 20 times of calibers before target type meter, is stayed after target type meter
There is the straight length not less than 5 times of calibers.
4. the controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement according to claim 3, it is characterized in that：It is described
Spiral case wall is at least corresponded on the shell of cryogenic pump, is set respectively in first, second, third at impeller inlet, at impeller outlet
Metering-orifice is spied out, each spy testing hole that each endoscope opens up from cryogenic pump is stretched into cryogenic pump, and each endoscope is corresponding to be connected
First, second, third high-speed camera, the output port of each high-speed camera are connected with computer unit respectively.
5. the controllable cryogenic pump external characteristics experimental rig of medium phase transformation inducement according to claim 3, it is characterized in that：It is described
Target type meter（10）Located at pump discharge straight length（12）On, pump inlet pressure sensor（24）Located at pump inlet straight length
（25）Upper close pump inlet end, pump discharge pressure sensor（13）Located at pump discharge straight length（12）Upper close pump discharge end, turns
On motor, flowmeter and sensor are connected fast sensor with computer unit respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107035676A (en) * | 2017-05-26 | 2017-08-11 | 南京工业大学 | Device and method for testing external characteristics of cryogenic pump with controllable medium phase change inducement |
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| CN107035676A (en) * | 2017-05-26 | 2017-08-11 | 南京工业大学 | Device and method for testing external characteristics of cryogenic pump with controllable medium phase change inducement |
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