CN116696829B - Performance test system and test method for centrifugal compressor - Google Patents
Performance test system and test method for centrifugal compressor Download PDFInfo
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- CN116696829B CN116696829B CN202310981138.3A CN202310981138A CN116696829B CN 116696829 B CN116696829 B CN 116696829B CN 202310981138 A CN202310981138 A CN 202310981138A CN 116696829 B CN116696829 B CN 116696829B
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- 238000011056 performance test Methods 0.000 title claims abstract description 38
- 238000010998 test method Methods 0.000 title description 3
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 230000001502 supplementing effect Effects 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 82
- 239000007788 liquid Substances 0.000 claims description 59
- 239000000498 cooling water Substances 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229920006395 saturated elastomer Polymers 0.000 claims description 24
- 239000012071 phase Substances 0.000 claims description 22
- 239000007791 liquid phase Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 13
- 239000011555 saturated liquid Substances 0.000 claims description 8
- 239000013589 supplement Substances 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000000110 cooling liquid Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 53
- 238000002360 preparation method Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of compressors, in particular to a performance test system and a performance test method for a centrifugal compressor. The integrated structure is simplified, the energy balance of the testing system is realized, the air suction, air supplementing and air discharging working conditions of the two-stage compressor are accurately tested, and the performance test of compressors of different models and working conditions is met.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a performance test system and a performance test method for a centrifugal compressor.
Background
Under the background of 'double carbon', the industrial waste heat recovery is extended to large-scale development, the development requirement of the centrifugal high-temperature heat pump compressor is more and more urgent, and the performance test work of the compressor is particularly important in the whole development process of the heat pump centrifugal compressor, and the performance test work period is long, the data volume is huge, and the test cost is high. The conventional test method needs to be matched with main equipment such as an evaporator, a condenser, an intercooler, a heat regenerator and the like, and is assembled into a heat pump unit for testing, so that the following problems exist: the test system is complex, the overall cost is high, the test period is long, and related container equipment is required to be designed according to the specification of the compressor; because the container equipment is matched and designed according to the specifications of the test compressors, the compressors with a plurality of specifications cannot be used commonly, and repeated waste of test resources is caused; the evaporator and the condenser both use water as a heat transfer medium, the circulation volume of the water side is large, the circulation power consumption of the water pump is high, and the electric energy consumption of the experiment is further increased; the test data has low regulation and control precision and insufficient stability, and the test data is easy to fluctuate.
How to accurately and efficiently perform performance experiment tests of the heat pump centrifugal compressor becomes a key problem affecting development of the heat pump centrifugal compressor.
Disclosure of Invention
Aiming at the prior art problems, the invention provides a performance test system and a performance test method for a centrifugal compressor.
The technical scheme for solving the technical problems is as follows: the utility model provides a performance test system for centrifugal compressor, includes controller, doublestage compressor and motor, the controller with motor communication connection, the output of motor with doublestage compressor is connected, still includes energy balance ware and blender, energy balance ware is connected with cooling water intake pipe and cooling water outlet pipe, doublestage compressor includes low pressure stage compressor and the high pressure stage compressor of series connection, the gas of high pressure stage compressor exhaust passes through the exhaust pipe and gets into the liquid space of energy balance ware and generates saturated gas, saturated gas in the energy balance ware passes through pipeline one get into the blender, saturated liquid in the energy balance ware is partly gets into the blender, another part passes through the liquid supply pipeline to the motor is cooled down and is generated superheated gas, superheated gas passes through pipeline two get into the blender, the export of blender passes through the inlet connection of air intake pipe and low pressure stage compressor, air intake pipe and exhaust pipe all are equipped with pressure sensor, temperature sensor and flowmeter, the controller, energy balance ware, temperature sensor and pressure sensor connect respectively.
Based on the technical scheme, the invention can also make the following improvements on the technical scheme:
further, the energy balance device further comprises an air supplementing pipeline, one end of the air supplementing pipeline is connected with an air supplementing port of the two-stage compressor, and the other end of the air supplementing pipeline is connected with the energy balance device.
Further, the energy balancer further comprises a working medium buffer regulator, the exhaust pipe is connected with a gas phase pipeline through a regulating pipeline, one end of the gas phase pipeline is connected with an inlet of the mixer, the other end of the gas phase pipeline is connected with the working medium buffer regulator, and the working medium buffer regulator is connected with a liquid space of the energy balancer through a liquid phase pipeline.
Further, a liquid supply regulating valve is arranged on the liquid supply pipeline and is electrically connected with the controller.
Further, the liquid space of the energy balancer is a vertical liquid storage cavity.
The beneficial effects of the invention are as follows: the device has the advantages that the whole structure is simplified, the economy is improved, the energy balance of the testing system is realized by arranging the energy balancer and the mixer, the air suction, air supplementing and exhaust working conditions of the two-stage compressor are accurately and stably tested, the stability is automatically adjusted and the data are recorded according to the set working conditions, the testing efficiency is improved, the performance tests of compressors of different models and working conditions can be completed, and the testing cost is further reduced.
The invention also discloses a performance test method for the centrifugal compressor, which adopts the performance test system, and comprises the following specific steps:
s1, starting cooling water circulation, opening a water inlet regulating valve on a cooling water inlet pipeline to an initial opening a, and calculating the cooling load of the energy balancer by the controller according to data measured by a cooling water flowmeter and a cooling water temperature sensor on the cooling water inlet pipeline and regulating the flow of the cooling water inlet pipeline according to the pressure of the energy balancer;
s2, closing guide vanes at the inlet of the compressor, fully opening an air suction regulating valve of the air inlet pipeline and an air discharge regulating valve I of the air discharge pipeline, closing an air supply regulating valve on the air supply pipeline, starting the compressor, gradually opening the guide vanes at the inlet of the compressor, gradually increasing the air suction and discharge pressure, and opening the air supply regulating valve on the air supply pipeline to an initial opening b;
s3, the controller controls the cooling liquid supply amount of the liquid supply pipeline to the motor according to the cooling return air superheat degree of the motor;
the exhaust gas of the high-pressure stage compressor is depressurized to an intermediate pressure through an exhaust regulating valve and then enters a vertical liquid storage cavity of the energy balancer, superheated gas formed after the depressurization of the exhaust gas is fully mixed and contacted with sufficient saturated liquid under the intermediate pressure, the superheated gas is fully converted into saturated gas under the intermediate pressure, and the heat of the exhaust gas is taken away by cooling water;
a part of saturated gas in the energy balancer enters a gas supplementing port of the two-stage compressor through the gas supplementing pipeline; the other part of saturated gas is decompressed by a regulating valve and becomes superheated gas to enter the mixer, one path of liquid of the energy balancer enters the mixer through the regulating valve and is fully mixed with the superheated gas cooled by the motor and returned by the motor in the mixer, and then enters an air suction port of the two-stage compressor through the air inlet pipeline;
the controller adjusts the liquid supply amount of the mixer according to the suction superheat degree of the two-stage compressor;
the controller adjusts the opening of the air supplementing regulating valve according to the air supplementing amount required by the test working condition, and adjusts the opening of the first exhaust regulating valve according to the exhaust pressure;
after the parameters of air suction, air discharge and air supplement of the test system are stable, the parameters are recorded by collecting flow parameters, pressure parameters and temperature parameters, the parameters are input into the controller, the controller automatically adjusts the circulation quantity of working media through target test working condition points, and the data are recorded by itself after the pressure change of the test system is controlled to be stable.
Further, when the suction pressure or the air supplementing pressure of the two-stage compressor is lower than the value required by the test working condition, the working medium buffer regulator supplements working medium to the energy balancer: and the second exhaust regulating valve on the regulating pipeline is opened, the gas phase regulating valve on the gas phase pipeline in the performance test system is closed, exhaust enters the working medium buffer regulator, the working medium buffer regulator is boosted, and liquid in the working medium buffer regulator is pressed into the energy balancer.
Further, when the suction pressure or the air supplementing pressure of the two-stage compressor is higher than the value required by the test working condition, the working medium needs to be released from the energy balancer to the working medium buffer regulator: and the second exhaust regulating valve on the regulating pipeline is closed, the gas phase regulating valve on the gas phase pipeline and the liquid phase regulating valve on the liquid phase pipeline in the performance test system are both opened, and the liquid in the energy balancer enters the working medium buffer regulator through the liquid phase pipeline.
Further, the initial opening a of the water inlet regulating valve is 20% -30%, and the initial opening b of the air supplementing regulating valve on the air supplementing pipeline is 20% -30%.
Further, the saturated evaporation temperature of the working medium is obtained through calculation of the cooling return air pressure of the motor, a difference value is calculated through the actual measurement return air temperature and the saturated evaporation temperature, the difference value is called actual measurement superheat degree, the controller adjusts the opening of the liquid supply adjusting valve after comparing the actual measurement superheat degree with target set superheat degree, when the actual measurement superheat degree is higher than the target set superheat degree, the valve of the liquid supply adjusting valve is opened, and when the actual measurement superheat degree is lower than the target set superheat degree, the valve of the liquid supply adjusting valve is closed.
The beneficial effects of the invention are as follows: according to the difference between the target test working condition and the actual operation working condition, the working medium circulation quantity is dynamically adjusted through the working medium buffer regulator, so that the accurate matching of the working medium circulation quantity and the target test working condition is realized, the stability of the data of the test working condition is ensured, and the test data is real, reliable and high in quality. The test can be performed on compressors of different specifications and sizes, the universality is strong, the test working medium consumption is reduced, and the test energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of a performance testing system according to the present invention.
Reference numerals: 1. a low pressure stage compressor; 2. a high pressure stage compressor; 3. a motor; 4. an energy balancer; 5. a mixer; 6. a cooling water inlet pipeline; 7. a cooling water outlet pipeline; 8. an exhaust line; 9. a vertical liquid storage cavity; 10. a first pipeline; 11. a liquid supply pipeline; 12. a second pipeline; 13. an air intake line; 14. an air supplementing pipeline; 15. a working medium buffer regulator; 16. adjusting the pipeline; 17. a gas phase pipeline; 18. a liquid phase pipeline; 19. an exhaust regulating valve I; 20. a liquid supply regulating valve; 21. an exhaust regulating valve II; 22. a flow meter; 23. a power meter.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the invention discloses a performance test system for a centrifugal compressor, which comprises a controller, a two-stage compressor and a motor 3, wherein the two-stage compressor is a high-temperature heat pump centrifugal two-stage compressor, the motor 3 is a semi-closed motor, the controller is in communication connection with the motor 3, the output end of the motor 3 is connected with the two-stage compressor, the performance test system also comprises an energy balancer 4 and a mixer 5, the energy balancer 4 is connected with a cooling water inlet pipeline 6 and a cooling water outlet pipeline 7, the two-stage compressor comprises a low-pressure stage compressor 1 and a high-pressure stage compressor 2 which are connected in series, gas discharged by the high-pressure stage compressor 2 enters a liquid space of the energy balancer 4 through an exhaust pipeline 8, the exhaust eliminates overheat to generate saturated gas in the process of contacting with the liquid, the saturated gas in the energy balancer 4 enters the mixer 5 through a pipeline 10, a part of saturated liquid in the energy balancer 4 enters the mixer 5, the other part of saturated liquid cools the motor 3 through a liquid supply pipeline 11 and generates overheated gas, a liquid supply regulating valve 20 is arranged on the liquid supply pipeline 11, the liquid supply regulating valve 20 is electrically connected with the controller, the overheated gas enters the mixer 5 through a pipeline II 12, an outlet of the mixer 5 is connected with an inlet of the low-pressure stage compressor 1 through an air inlet pipeline 13, pressure sensors, a temperature sensor and a flowmeter 22 are arranged on the air inlet pipeline 13 and the air outlet pipeline 8, the pressure sensors are used for detecting the air inlet pressure and the air outlet pressure of the two-stage compressor, the temperature sensors are used for detecting the air inlet temperature and the air outlet temperature of the two-stage compressor, the flowmeter 22 is used for detecting the air inlet flow and the air outlet flow of the two-stage compressor, the controller is electrically connected to the energy balancer 4, the mixer 5, the pressure sensor, the temperature sensor, and the flow meter 22, respectively. Each pipeline is provided with a regulating valve.
Further, the motor 3 is connected with a power meter 23, and the power meter 23 is used for detecting the power consumed by the motor 3 during operation, so that the working efficiency of the centrifugal compressor is tested.
The energy balancer 4 may be a heat exchanger in a shell-and-tube form, and the liquid space of the energy balancer 4 is a vertical liquid storage cavity 9. Ensuring that a sufficient amount of liquid is stored and ensuring that the energy balancer 4 balances the system.
The performance test system further comprises an air supplementing pipeline 14, a temperature sensor, a pressure sensor and a flowmeter 22 for detecting air supplementing are arranged on the air supplementing pipeline 14, an air supplementing regulating valve for regulating air supplementing amount is further arranged on the air supplementing pipeline 14, one end of the air supplementing pipeline 14 is connected with an air supplementing port of the two-stage compressor, and the other end of the air supplementing pipeline 14 is connected with the energy balancer 4. The saturated gas in the energy balancer 4 adjusts the air supplementing flow through the air supplementing regulating valve of the air supplementing pipeline 14, so that the air supplementing completely accords with the actual working state, and the accuracy of the test result is ensured.
The performance test system further comprises a working medium buffer regulator 15, the exhaust pipeline 8 is connected with a gas phase pipeline 17 through a regulating pipeline 16, one end of the gas phase pipeline 17 is connected with the inlet of the mixer 5, the other end of the gas phase pipeline 17 is connected with the working medium buffer regulator 15, and the working medium buffer regulator 15 is connected with the liquid space of the energy balancer 4 through a liquid phase pipeline 18. The working medium content in the system is adjusted by controlling the adjusting pipeline 16, the gas-phase pipeline 17 and the liquid-phase pipeline 18, the dynamic adjustment of the working medium circulation volume of the test system is realized, and then the automatic adjustment and stabilization of experimental test working condition points are realized, so that the test workload is greatly reduced, the use requirements of compressors of different models are met, the universality is improved, and the test cost is reduced.
The working medium buffer regulator 15 is a cylindrical container and is used for storing buffer working medium, so as to realize dynamic adjustment of the working medium in the system.
Further, the exhaust pipe 8 is provided with an exhaust regulating valve one 19, and the exhaust pipe 8 bypasses the regulating pipe 16 at an inlet of the exhaust regulating valve one 19. Before the exhaust of the two-stage compressor is not regulated in pressure, the gas with certain pressure is bypassed to the regulating pipeline 16 and the working medium buffer regulator 15, so that the boosting effect of the exhaust on the working medium in the working medium buffer regulator 15 is ensured, and the working medium is ensured to meet the use requirement of the system.
Further, the liquid phase pipeline 18 extends into the lower end of the working medium buffer regulator 15, so that the working medium in the working medium buffer regulator 15 can normally enter the energy balancer 4, the working medium is supplemented into the system, and the stable operation of the system is ensured.
The invention also discloses a performance test method for the centrifugal compressor, which adopts the performance test system, and comprises the following specific steps:
opening the filling valves on the energy balancer 4 and the working medium buffer regulator 15, filling a sufficient amount of working medium into the energy balancer 4 and the working medium buffer regulator 15, and filling the rest working medium into the working medium buffer regulator 15 by taking the filling of the vertical liquid storage cavity 9 as a benchmark in the energy balancer 4.
All regulating valves are in a closed state before the start-up test.
S1, starting cooling water circulation, opening a water inlet regulating valve on a cooling water inlet pipeline 6 to an initial opening a, calculating the cooling load of the energy balancer 4 by the controller according to data measured by a cooling water flowmeter and a cooling water temperature sensor on the cooling water inlet pipeline 6, and regulating the flow of the cooling water inlet pipeline 6 according to the pressure of the energy balancer 4, wherein the cooling load Q=C Water and its preparation method ×ρ Water and its preparation method ×V Water and its preparation method （t Effluent water -t Inflow of water ），C Water and its preparation method Specific heat of water ρ Water and its preparation method For density of water, V Water and its preparation method Is the flow rate of water, t Effluent water At the outlet water temperature t Inflow of water The temperature of the water is the water inlet temperature;
when the pressure of the energy balancer 4 is greater than the set pressure, it means that the amount of gas discharged from the two-stage compressor to the energy balancer 4 is greater, and the cooling effect of the energy balancer 4 needs to be increased, so that the flow rate of the cooling water inlet pipe 6 is increased, whereas when the pressure of the energy balancer 4 is less than the set pressure, the flow rate of the cooling water inlet pipe 6 is decreased.
When the initial opening of the water inlet regulating valve is more than 30%, the cooling water is too much, and the situation that water mist is still in the saturated gas easily occurs, so that the two-stage compressor has the condition of air supplementing and liquid carrying and the service life of the two-stage compressor is influenced.
S2, closing guide vanes at the inlet of the two-stage compressor, fully opening an air suction adjusting valve of the air inlet pipeline 13 and an air discharge adjusting valve I19 on the air discharge pipeline 8, closing an air supply adjusting valve on the air supply pipeline 14, starting the two-stage compressor, gradually opening the guide vanes at the inlet of the two-stage compressor, gradually increasing the air suction and discharge pressure, and opening the air supply adjusting valve on the air supply pipeline 14 to an initial opening b, wherein the initial opening b is 20% -30%;
s3, the controller controls the cooling liquid supply amount of the liquid supply pipeline 11 to the motor 3 according to the cooling return air superheat degree of the motor 3, and ensures the cooling return air superheat degree of the motor 3;
the exhaust gas of the high-pressure stage compressor 2 is depressurized to the intermediate pressure through an exhaust regulating valve I19 and then enters a vertical liquid storage cavity 9 of the energy balancer 4, the exhaust temperature, the exhaust pressure and the exhaust flow of the two-stage compressor are measured through a temperature sensor, a pressure sensor and a flow sensor on an exhaust pipeline 8, the overheated gas formed after the depressurization of the exhaust gas is fully mixed and contacted with sufficient saturated liquid under the intermediate pressure, the overheated gas is completely converted into saturated gas under the intermediate pressure, and the heat of the exhaust gas is taken away by cooling water;
a part of saturated gas under the intermediate pressure in the energy balancer 4 enters a gas supplementing port of the two-stage compressor through the gas supplementing pipeline 14; the other part of saturated gas is decompressed by a regulating valve and becomes superheated gas to enter the mixer 5, one path of liquid of the energy balancer 4 enters the mixer 5 through the regulating valve and is fully mixed with superheated gas cooled by the motor 3 and returned by the motor 3 in the mixer 5, and then enters an air suction port of the two-stage compressor through the air inlet pipeline 13;
the controller adjusts the liquid supply amount of the mixer 5 according to the suction superheat degree of the two-stage compressor;
the controller adjusts the opening of the air supplementing regulating valve in real time according to the air supplementing amount required by the test working condition, and adjusts the opening of the exhaust regulating valve I19 according to the exhaust pressure;
after the parameters of air suction, air discharge and air supplement of the test system are stable, the parameters are recorded by collecting flow parameters, pressure parameters and temperature parameters, the parameters are input into the controller, the actual working condition point is tested by comparing the parameters with the target test working condition point, the controller automatically adjusts the working medium circulation quantity, and the data is automatically recorded after the pressure change of the test system is controlled to be stable.
After the parameters of the air suction and exhaust and air supplement of the test system are stable, when the air suction pressure and air supplement pressure of the two-stage compressor are lower than the values required by the test working conditions, the working medium buffer regulator 15 supplements working medium to the energy balancer 4: the second exhaust regulating valve 21 on the regulating pipeline 16 is opened, the gas phase regulating valve on the gas phase pipeline 17 in the performance test system is closed, exhaust enters the working medium buffer regulator 15, the working medium buffer regulator 15 is boosted, and liquid in the working medium buffer regulator 15 is pressed into the vertical liquid storage cavity 9 of the energy balancer 4 through the liquid phase pipeline 18, so that working medium is supplemented into the system.
When the suction pressure and the air supplementing pressure of the two-stage compressor are higher than the values required by the test working conditions, the working medium needs to be released from the energy balancer 4 to the working medium buffer regulator 15: the second exhaust regulating valve 21 on the regulating pipeline 16 is closed, the gas phase regulating valve on the gas phase pipeline 17 and the liquid phase regulating valve on the liquid phase pipeline 18 in the performance test system are both opened, and the liquid in the energy balancer 4 enters the working medium buffer regulator 15 through the liquid phase pipeline 18, so that heavy working medium of the system is reduced, the suction or air supplementing pressure is ensured to be at a required value of a test working condition, the accuracy of a test result is ensured, and the operation is simple.
The saturated evaporation temperature of the working medium is obtained through the calculation of the cooling return air pressure of the motor 3, the difference value is calculated through the actual measured return air temperature and the saturated evaporation temperature, the difference value is called actual superheat degree, the controller adjusts the opening of the liquid supply regulating valve 20 on the liquid supply pipeline 11 according to the comparison between the actual measured superheat degree and the target set superheat degree, when the actual measured superheat degree is higher than the target set superheat degree, the valve of the liquid supply regulating valve 20 is opened, and when the actual measured superheat degree is lower than the target set superheat degree, the valve of the liquid supply regulating valve 20 is closed.
In the method, in the process of the invention,P S for cooling the return air pressure; t is the saturated evaporation temperature.
A, B, C, D, E and F are constant coefficients, and when the types of working mediums are different, the values of the constant coefficients are different.
For example, when the working fluid is R134a,
A=24.8033988B=-0.3980408×10 4
C=-0.2405332×10 -1 ；D=0.2245211×10 -4
E=0.1995548；F=0.3748473×10 3
the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A performance test method for a centrifugal compressor, characterized in that, based on a performance test system, the performance test system comprises a controller, a two-stage compressor and a motor (3), the controller is in communication connection with the motor (3), the output end of the motor (3) is connected with the two-stage compressor, the performance test method further comprises an energy balancer (4) and a mixer (5), the energy balancer (4) is connected with a cooling water inlet pipeline (6) and a cooling water outlet pipeline (7), the two-stage compressor comprises a low-pressure stage compressor (1) and a high-pressure stage compressor (2) which are connected in series, gas discharged by the high-pressure stage compressor (2) enters a liquid space of the energy balancer (4) through an exhaust pipeline (8) and generates saturated gas, the saturated gas in the energy balancer (4) enters the mixer (5) through a first pipeline (10), one part of saturated liquid in the energy balancer (4) enters the mixer (5), the other part of saturated liquid enters the motor (3) through a liquid supply pipeline (11) and the cooled gas enters the low-pressure stage compressor (1) through a second pipeline (13) and generates superheated gas, and the superheated gas in the low-pressure stage compressor (5) enters the inlet pipeline (13), the air inlet pipeline (13) and the air outlet pipeline (8) are respectively provided with a pressure sensor, a temperature sensor and a flowmeter (22), and the controller is respectively and electrically connected with the energy balancer (4), the mixer (5), the pressure sensor, the temperature sensor and the flowmeter (22); the device also comprises a gas supplementing pipeline (14), one end of the gas supplementing pipeline (14) is connected with a gas supplementing port of the two-stage compressor, the other end is connected with the energy balancer (4),
the specific steps of the performance test method are as follows:
s1, starting cooling water circulation, opening a water inlet regulating valve on a cooling water inlet pipeline (6) to an initial opening a, and calculating the cooling load of an energy balancer (4) by the controller according to data measured by a cooling water flowmeter and a cooling water temperature sensor on the cooling water inlet pipeline (6), and regulating the flow of the cooling water inlet pipeline (6) according to the pressure of the energy balancer (4);
s2, closing a guide vane at the inlet of the compressor, fully opening an air suction regulating valve of the air inlet pipeline (13) and an air discharge regulating valve I (19) on the air discharge pipeline (8), closing an air supplementing regulating valve on the air supplementing pipeline (14), starting the compressor, gradually opening the guide vane at the inlet of the compressor, gradually increasing the air suction and discharge pressure, and opening the air supplementing regulating valve on the air supplementing pipeline (14) to an initial opening b;
s3, the controller controls the cooling liquid supply amount of the liquid supply pipeline (11) to the motor (3) according to the cooling return air superheat degree of the motor (3);
the exhaust gas of the high-pressure stage compressor (2) is depressurized to an intermediate pressure through an exhaust regulating valve I (19) and then enters a vertical liquid storage cavity (9) of the energy balancer (4), superheated gas formed after the depressurization of the exhaust gas is fully mixed and contacted with sufficient saturated liquid under the intermediate pressure, the superheated gas is fully converted into saturated gas under the intermediate pressure, and the heat of the exhaust gas is taken away by cooling water;
a part of saturated gas in the energy balancer (4) enters a gas supplementing port of the two-stage compressor through the gas supplementing pipeline (14); the other part of saturated gas is decompressed by a regulating valve and becomes superheated gas to enter the mixer (5), one path of liquid of the energy balancer (4) enters the mixer (5) through the regulating valve, and the superheated gas cooled by the motor (3) and returned gas are fully mixed in the mixer (5) and enter an air suction port of the two-stage compressor through the air inlet pipeline (13);
the controller adjusts the liquid supply amount of the mixer (5) according to the suction superheat degree of the two-stage compressor;
the controller adjusts the opening of the air supplementing regulating valve according to the air supplementing amount required by the test working condition, and adjusts the opening of the exhaust regulating valve I (19) according to the exhaust pressure;
after the parameters of air suction, air discharge and air supplement of the test system are stable, the parameters are recorded by collecting flow parameters, pressure parameters and temperature parameters, the parameters are input into the controller, the controller automatically adjusts the circulation quantity of working media through target test working condition points, and the data are recorded by itself after the pressure change of the test system is controlled to be stable.
2. The performance test method according to claim 1, further comprising a working medium buffer regulator (15), wherein the exhaust pipeline (8) is connected with a gas phase pipeline (17) through a regulating pipeline (16), one end of the gas phase pipeline (17) is connected with an inlet of the mixer (5), the other end is connected with the working medium buffer regulator (15), and the working medium buffer regulator (15) is connected with a liquid space of the energy balancer (4) through a liquid phase pipeline (18).
3. The performance test method according to claim 1, wherein a liquid supply regulating valve (20) is provided on the liquid supply pipeline (11), and the liquid supply regulating valve (20) is electrically connected with the controller.
4. The performance testing method according to claim 1, characterized in that the liquid space of the energy balancer (4) is a vertical liquid storage cavity (9).
5. The performance test method according to claim 2, characterized in that the working medium buffer regulator (15) supplements the working medium to the energy balancer (4) when the suction pressure and the pressure of the two-stage compressor are lower than the values required for the test conditions: and a second exhaust regulating valve (21) on the regulating pipeline (16) is opened, a gas phase regulating valve on a gas phase pipeline (17) in the performance test system is closed, exhaust enters the working medium buffer regulator (15), the working medium buffer regulator (15) is boosted, and liquid in the working medium buffer regulator (15) is pressed into the energy balancer (4).
6. The performance test method according to claim 2, characterized in that when the suction pressure and the make-up pressure of the two-stage compressor are higher than the values required for the test conditions, the working medium needs to be released from the energy balancer (4) to the working medium buffer regulator (15): and an exhaust regulating valve II (21) on the regulating pipeline (16) is closed, a gas phase regulating valve on a gas phase pipeline (17) and a liquid phase regulating valve on a liquid phase pipeline (18) in the performance test system are both opened, and liquid in the energy balancer (4) enters the working medium buffer regulator (15) through the liquid phase pipeline (18).
7. The performance test method according to claim 1, wherein the initial opening a of the intake regulating valve is 20% -30%, and the initial opening b of the air-supplementing regulating valve on the air-supplementing line (14) is 20% -30%.
8. The performance test method according to claim 1, wherein the saturated evaporating temperature of the working medium is calculated by cooling the return air pressure by the motor (3), a difference value is calculated by actually measuring the return air temperature and the saturated evaporating temperature, the difference value is called actually measured superheat degree, the controller adjusts the opening degree of the liquid supply regulating valve (20) according to comparison between the actually measured superheat degree and the target set superheat degree, when the actually measured superheat degree is higher than the target set superheat degree, the valve of the liquid supply regulating valve (20) is opened, and when the actually measured superheat degree is lower than the target set superheat degree, the valve of the liquid supply regulating valve (20) is closed.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191958A (en) * | 1997-01-06 | 1998-09-02 | 运载器有限公司 | Combination valve for screw compressors |
| CN106802007A (en) * | 2015-11-26 | 2017-06-06 | 同方人工环境有限公司 | A kind of water cooled chiller of use single machine compression with double stage centrifugal compressor |
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- 2023-08-07 CN CN202310981138.3A patent/CN116696829B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191958A (en) * | 1997-01-06 | 1998-09-02 | 运载器有限公司 | Combination valve for screw compressors |
| AR011364A1 (en) * | 1997-01-06 | 2000-08-16 | Carrier Corp Una Corporacion Del Estado De Delaware | COMPRESSOR WITH VALVE TO POINT AND CONTROL ANTI-REVERSE ROTATION |
| CN106802007A (en) * | 2015-11-26 | 2017-06-06 | 同方人工环境有限公司 | A kind of water cooled chiller of use single machine compression with double stage centrifugal compressor |
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