Testing device for enthalpy-increasing compressor of flash tank

Abstract

The invention discloses a testing device for an enthalpy-increasing compressor of a flash tank, and relates to the technical field of compressor testing. The system comprises a tested compressor, the head and the tail of the tested compressor are connected in series to a main path test assembly through a refrigerant pipeline, and an enthalpy increasing path test assembly is connected between an enthalpy increasing opening of the tested compressor and the refrigerant pipeline of the main path test assembly; a loop formed by the main path test assembly comprises a condenser, a liquid storage tank, a filter, a first subcooler and a calorimeter which are sequentially connected through a refrigerant pipeline, the condenser is connected with an exhaust port of the tested compressor through the refrigerant pipeline, and the calorimeter is connected with an air suction port of the tested compressor through the refrigerant pipeline. The system is compatible with the conventional performance test of the compressor and the performance test of enthalpy increase with the flash tank, and can independently measure and calculate the flow of an enthalpy increase path; the flash tank is provided with a floating ball liquid level meter for monitoring and measurement, automatic liquid level adjustment and control can be achieved, and when a conventional performance test is switched, liquid refrigerants in the flash tank can be automatically recycled.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressor testing, in particular to a flash evaporator enthalpy-increasing compressor testing device. BACKGROUND

[0002] As the core component of the refrigeration cycle system, the performance of the compressor directly affects the stability and power consumption of the test system. For traditional refrigeration compressors, there are usually only suction and discharge ports. When doing low-temperature heating conditions, the compressor will have high exhaust temperature, overload and even damage. Therefore, the market has also launched compressors with enthalpy-increasing ports to solve the problem of high exhaust temperature and reduced refrigeration performance. Especially for the current national government's "coal-to-electricity" implementation plan, which clearly prioritizes the promotion of air source heat pumps, ground source heat pumps and other high-efficiency equipment. The enthalpy-increasing mode of the compressor of such equipment is mostly achieved by using a flash evaporator, so there is a great demand for testing devices to test the performance or service life of such compressors.

[0003] The existing patent number "CN 105865661 A" mentions a volumetric enthalpy-increasing compressor refrigeration capacity testing device and testing method. By adding a second supercooler between the flash evaporator and the second flow meter, the refrigerant entering the second flow meter is converted from the original gas-liquid two-phase to pure liquid phase, so that the amount of refrigerant passing through the second flow meter can be accurately measured. The calculation of the refrigeration capacity of the tested compressor can be based on accurate values, without the need for approximate values for estimation, greatly improving the accuracy of the enthalpy-increasing compressor refrigeration capacity test. However, the stability of the flash evaporator flow control during the test process is poor, and the stability of the test system during the flash process cannot be guaranteed.

[0004] To solve the problem of effectively and accurately measuring the refrigeration capacity and power of the compressor under different working conditions, and to provide effective development and evaluation equipment for compressor manufacturers, the present application provides a flash evaporator enthalpy-increasing compressor testing device. SUMMARY

[0005] The present application aims to provide a flash evaporator increased enthalpy compressor testing device, in the compressor conventional performance testing, the suction pressure, the exhaust pressure, the suction temperature and the expansion valve inlet temperature of the compressor need to be controlled, the refrigerant mass flow is tested under the condition of stable working condition, the exhaust temperature, the electric parameter and other core parameters of the compressor are monitored synchronously, the refrigerating capacity and C.O.P under the current state are calculated; in the compressor with flash evaporator increased enthalpy performance testing, the suction pressure, the exhaust pressure, the suction temperature, the expansion valve inlet temperature and the increased enthalpy pressure of the compressor need to be controlled, the refrigerant mass flow and the increased enthalpy refrigerant mass flow are tested under the condition of stable working condition, the exhaust temperature, the electric parameter and other core parameters of the compressor are monitored synchronously, the refrigerating capacity and C.O.P under the current state are calculated; the problems that the flash evaporator flow control is not stable enough, there is no suitable flash evaporator tank liquid level control and flash evaporation tank bottom liquid refrigerant returning to the main system control scheme and the system stability and calculation accuracy in the flash evaporation process are difficult to improve in the existing compressor testing device are solved.

[0006] To solve the above technical problems, the present application is realized by the following technical scheme: The present application is a kind of flash evaporator increased enthalpy compressor testing device, including the compressor to be measured, the first and last of the compressor to be measured are connected in series on the main road test component through the refrigerant pipeline, and the increased enthalpy port of the compressor to be measured is connected with the refrigerant pipeline of the main road test component through the increased enthalpy road test component;The compressor to be measured is taken as the sample to be tested, and is connected to the testing device for related test, The loop formed by the main road test component includes the condenser, the liquid storage tank, the filter, the first subcooler and the calorimeter connected in sequence through the refrigerant pipeline, the condenser is connected with the exhaust port of the compressor to be measured through the refrigerant pipeline, and the calorimeter is connected with the suction port of the compressor to be measured through the refrigerant pipeline;The condenser is used for controlling the exhaust pressure of the compressor to be measured, the liquid storage tank is used for storing the refrigerant quantity as the buffering effect, the filter is used for filtering the moisture or impurities in the refrigerant, and the first subcooler and the second subcooler are used for controlling the valve front supercooling degree of the compressor to be measured; The increased enthalpy road test component includes a flash evaporator, the gas phase outlet of the flash evaporator is connected with the increased enthalpy port of the compressor to be measured through the refrigerant pipeline, and the gas-liquid inlet of the flash evaporator is connected with the refrigerant pipeline of the main road test component through the refrigerant pipeline.

[0007] Preferably, the increased enthalpy road test component further includes a second subcooler, the inlet of the second subcooler is connected with the liquid phase outlet of the flash evaporator, and the outlet of the second subcooler is connected with the main road test component through the refrigerant pipeline.

[0008] Preferably, an exhaust temperature sensor and an exhaust pressure sensor are installed at the exhaust port of the compressor under test to measure the exhaust temperature TD and exhaust pressure PD of the compressor under test; simultaneously, a pneumatic ball valve UNS is installed on the refrigerant pipeline adjacent to the exhaust port of the compressor under test; a pneumatic ball valve UNS, a refrigerant mass flow meter FLO, a valve inlet temperature sensor measuring the main valve inlet temperature TVI, a valve inlet pressure sensor measuring the main valve inlet pressure PVI, and a regulating valve UEW for adjusting the suction pressure of the compressor under test are installed on the refrigerant pipeline between the first subcooler and the calorimeter; a calorimeter temperature sensor and a calorimeter pressure sensor are installed at the outlet of the calorimeter to measure the calorimeter outlet temperature TEO and outlet pressure PEO; and a sensor for measuring the suction temperature TS of the compressor under test is installed at the suction port of the compressor under test. The device includes a suction temperature sensor and a suction pressure sensor (PS). A pneumatic ball valve (UNS) is installed on the refrigerant pipeline near the suction port of the compressor under test. A refrigerant mass flow meter (FLO) measures the refrigerant mass flow rate in the main flow path and the refrigerant mass flow rate in the enthalpy-increasing flow path. Five pneumatic ball valves (UNS-UNS) are used to switch or shut off the refrigerant flow path of the test device to meet different testing requirements. A regulating valve (UEW) adjusts the suction pressure of the compressor under test, and the regulating valve (UEW) adjusts the enthalpy-increasing pressure of the compressor under test. A calorimeter controls the suction temperature of the compressor under test. The second subcooler serves as a container for controlling flashover, and a level gauge (OAF) inside the second subcooler monitors the liquid level inside the subcooler.

[0009] When the compressor under test is being tested, the suction pressure PS of the compressor under test is controlled by controlling the opening degree of the regulating valve UEW; the suction temperature TS is controlled by controlling the heating of the refrigerant by controlling the electric heating module of the calorimeter; and the discharge pressure PD is controlled by controlling the cooling water flow rate of the condenser. In the control of the inlet temperature TVI, when there is no enthalpy increase control, the inlet temperature TVI is controlled by controlling the electric heating amount of the first subcooler; when there is enthalpy increase control, the inlet temperature TVI is controlled by controlling the electric heating amount of the second subcooler. The enthalpy increase pressure Pinj is controlled by adjusting the opening degree of the regulating valve UEW.

[0010] Preferably, the flash evaporator is equipped with a regulating valve UEW at its gas-liquid inlet for adjusting the enthalpy-increasing pressure of the compressor under test; simultaneously, the flash evaporator is equipped with an enthalpy-increasing valve inlet temperature sensor and an enthalpy-increasing valve inlet pressure sensor for measuring the enthalpy-increasing valve inlet temperature TVI and the enthalpy-increasing valve inlet pressure PVI; the compressor under test is equipped with an enthalpy-increasing valve inlet position for measuring the enthalpy-increasing temperature Tinj and the enthalpy-increasing pressure Pinj; the compressor under test is also equipped with a pneumatic ball valve UNS at its enthalpy-increasing port position; and the second subcooler is equipped with a pneumatic ball valve UNS at its outlet position.

[0011] Preferably, in the circuit formed by the main circuit test component, the refrigerant sequentially passes through the compressor under test, condenser, liquid receiver, filter, first subcooler, and calorimeter, and finally flows back to the compressor under test to complete a complete test circuit; in the circuit formed by the enthalpy-increasing circuit test component, the refrigerant sequentially passes through the compressor under test, condenser, liquid receiver, filter, first subcooler, and flash evaporator. When the refrigerant passes through the flash evaporator, the gaseous refrigerant is output to the compressor under test to complete a complete circuit, while the liquid refrigerant is discharged from the liquid phase outlet of the flash evaporator, sequentially passes through the second subcooler and calorimeter, and finally flows back to the compressor under test to complete a complete circuit.

[0012] Preferably, the flash evaporator is equipped with a level gauge OAF to monitor the liquid level in the flash evaporator; after the liquid refrigerant flashes through the flash evaporator, the gaseous refrigerant is discharged through the gaseous outlet of the flash evaporator until it flows into the compressor under test, and the liquid refrigerant is discharged through the liquid outlet of the flash evaporator to be subcooled in the second subcooler.

[0013] Preferably, the flash evaporator gas-liquid inlet is connected to the refrigerant pipeline between the first subcooler and the pneumatic ball valve UNS via a refrigerant pipeline, and the refrigerant pipeline is simultaneously equipped with a regulating valve UEW, a temperature sensor before the enthalpy-increasing valve, a pressure sensor before the enthalpy-increasing valve, and a refrigerant mass flow meter FL.

[0014] Preferably, the outlet of the second subcooler is connected via a refrigerant pipe to the refrigerant pipe between the pneumatic ball valve UNS and the refrigerant mass flow meter FLO. Preferably, when performing performance tests on a conventional compressor: Refrigerant flow rate through the calorimeter The calculation formula, with units of kg / h, is shown in equation (A): (A) Wherein: The electric heating power of the calorimeter (obtained by measuring with an electrical power meter); The heat loss of the calorimeter (8) is obtained by measuring the temperature difference between the inside and outside of the calorimeter and the heat loss coefficient. The specific enthalpy at the calorimeter outlet is measured in kJ / kg (obtained from the refrigerant property table by using the calorimeter outlet temperature TEO and the calorimeter outlet pressure PEO). The specific enthalpy is the measured value before the regulating valve UEW1, in kJ / kg (obtained from the refrigerant property table by referring to the main valve inlet temperature TVI and the main valve inlet pressure PVI). The measured refrigerant flow rate of the main refrigerant flow meter FLO1 before the regulating valve UEW1 is: The unit is kg / h; Main side cooling capacity The calculation formula, with W as the unit, is shown in equation (B): (B) Among them, To measure the main-side cooling capacity of the compressor under test under specified operating conditions; The theoretical specific enthalpy of the refrigerant entering the compressor under specified operating conditions is given in kJ / kg (obtained from the refrigerant property table by referring to the suction temperature TS and suction pressure PS set under the operating conditions). The theoretical specific enthalpy of the refrigerant before regulating valve UEW1 under specified operating conditions is given in KJ / Kg (obtained from the refrigerant property table by referring to the temperature and pressure before regulating valve UEW1 under the specified operating conditions). This is the correction factor for the specific volume of the compressor's intake port. Auxiliary cooling capacity The calculation formula, with W as the unit, is shown in equation (C): (C) Among them, To measure the auxiliary cooling capacity of the compressor under test under specified operating conditions; The measured refrigerant flow rate is for the refrigerant flow meter in the pre-valve liquid path, in kg / h.

[0015] Preferably, when performing performance testing on a compressor with a flash evaporator and enthalpy-increasing capacity: Refrigerant flow rate through the calorimeter The calculation formula, with units of kg / h, is shown in equation (D): (D) Wherein: The electric heating power of the calorimeter (obtained by measuring with an electrical power meter); The heat loss of the calorimeter (8) is obtained by measuring the temperature difference between the inside and outside of the calorimeter and the heat loss coefficient. The specific enthalpy at the calorimeter outlet is measured in kJ / kg (obtained from the refrigerant property table by using the calorimeter outlet temperature TEO and the calorimeter outlet pressure PEO). The specific enthalpy is the measured value before the regulating valve UEW1, in kJ / kg (obtained from the refrigerant property table by referring to the main valve inlet temperature TVI and the main valve inlet pressure PVI). The measured refrigerant flow rate of the main refrigerant flow meter FLO1 before the regulating valve UEW1 is: The unit is kg / h; Main side cooling capacity The calculation formula, with W as the unit, is shown in equation (E): (E) Among them, The theoretical specific enthalpy of the refrigerant liquid at the refrigerant saturation temperature corresponding to the refrigerant injection pressure of the compressor under test equipped with a calorimeter under specified operating conditions, expressed in kJ / kg. Auxiliary cooling capacity The calculation formula, with W as the unit, is shown in equation (F): (F).

[0016] The present invention has the following beneficial effects: 1. In the stability scheme of flash generator flow control in this invention, the refrigerant state before the regulating valve UEW2 is controlled by the first subcooler to be subcooled, so as to ensure the stability of flow test and the accuracy of the measured refrigerant mass flow meter FLO2.

[0017] 2. In the control scheme of the liquid level in the flash evaporator tank and the return of the liquid refrigerant at the bottom of the tank to the main test circuit after flash evaporation, the refrigerant is discharged after being compressed by the compressor under test. The discharged refrigerant is a high-temperature and high-pressure gaseous refrigerant. It is condensed into liquid refrigerant by the condenser and adjusted to the discharge pressure of its test target. The condensed liquid refrigerant enters the liquid receiver for buffering. During the buffering process, it plays a buffering role. Then the refrigerant flows through the filter to filter out the water or impurities in the refrigerant, and then enters the first subcooler for subcooling.

[0018] 3. In this invention, when testing the performance of a compressor with a flash evaporator and enthalpy-increasing capacity, pneumatic valve UNS3 is closed, pneumatic valve UNS4 is opened, and level gauge OAF2 monitors the refrigerant liquid level inside the flash evaporator. The gaseous refrigerant from the flash evaporator enters the enthalpy-increasing port of the compressor under test through the opening of pneumatic valve UNS5. The liquid refrigerant from the flash evaporator enters the second subcooler from the bottom liquid outlet, and after subcooling, it enters the main refrigerant mass flow meter FLO1 for measurement. Then, it is adjusted to the target suction pressure PS and target suction temperature TS of the compressor under test through regulating valve UEW1 and calorimeter, respectively, and finally enters the suction port of the compressor under test for compression. This cycle is repeated. At this time, the measured enthalpy-increasing flow rate = refrigerant mass flow meter FLO2 - refrigerant mass flow meter FLO1.

[0019] 4. In this invention, when testing the performance of a conventional compressor, first close the pneumatic valve UNS5 and the regulating valve UEW2, open the pneumatic valve UNS4, and close the pneumatic valve UNS3. When the liquid level gauge OAF2 monitors that the liquid level in the flash evaporator is lower than the set liquid level height value, close the pneumatic valve UNS4 and open the pneumatic valve UNS3. Keep the pneumatic valve UNS5 and the regulating valve UEW2 closed. After the refrigerant enters the main circuit and is measured by the refrigerant mass flow meter FLO1, it is adjusted to the target suction pressure PS and the target suction temperature TS of the compressor under test through the regulating valve UEW1 and the calorimeter, respectively. Finally, it enters the suction port of the compressor under test for compression. The cycle is repeated. The actual flow rate of the compressor under test is equal to the actual flow rate of the refrigerant mass flow meter FLO1.

[0020] 5. By adding two subcoolers at different locations, this invention ensures that the coolers before entering the enthalpy-increasing valve and before entering the main valve are both in a subcooled state, thus guaranteeing the accuracy of measurement and control. According to the calculation formula, it can improve the stability and calculation accuracy of the test device during the flash process.

[0021] 6. By setting up two sets of test circuits, this invention can meet different test requirements. When performing a conventional compressor test, some valves are closed to complete the test. When performing an enthalpy-increasing compressor test, the other valves are opened to complete the test. By adjusting the opening and closing of different valves, two test requirements can be met, which greatly improves the practicality of the test device.

[0022] 7. This invention is compatible with both conventional compressor performance testing and performance testing with enthalpy enhancement via a flash evaporator. It can independently calculate the flow rate of the enthalpy enhancement path. The flash evaporator is equipped with a float level gauge for monitoring and measurement, enabling automatic level adjustment control. When switching to conventional performance testing, it can automatically recover the liquid refrigerant in the flash evaporator to prevent excessive liquid refrigerant expansion and pressure rise from causing safety issues such as pressure loss in the components. Subcoolers are added before the flash evaporator valve and at the flash evaporator liquid outlet to ensure that the process refrigerant is in a subcooled state, making the enthalpy value accurate and the measured flow rate stable, resulting in accurate final calculation results. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a general diagram of the flash enthalpy-increasing compressor testing device provided by the present invention.

[0025] The attached diagram lists the components represented by each number as follows: 1. Compressor under test; 2. Condenser; 3. Liquid receiver; 4. Filter; 5. First subcooler; 6. Flash evaporator; 7. Second subcooler; 8. Calorimeter. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0027] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] See Figure 1 The present invention is a flash enthalpy-increasing compressor testing device, including a compressor under test 1. The beginning and end of the compressor under test 1 are connected in series to the main circuit testing component through refrigerant pipes, and an enthalpy-increasing circuit testing component is connected between the enthalpy-increasing port of the compressor under test 1 and the refrigerant pipe of the main circuit testing component. The circuit formed by the main circuit test assembly includes a condenser 2, a liquid storage tank 3, a filter 4, a first subcooler 5, and a calorimeter 8 connected in sequence through refrigerant pipes. The condenser 2 is connected to the exhaust port of the compressor under test 1 through a refrigerant pipe, and the calorimeter 8 is connected to the suction port of the compressor under test 1 through a refrigerant pipe. The enthalpy-increasing circuit test assembly includes a flash evaporator 6. The gas phase outlet of the flash evaporator 6 is connected to the enthalpy-increasing port of the compressor under test 1 through a refrigerant pipe, and the gas-liquid inlet of the flash evaporator 6 is connected to the refrigerant pipe of the main circuit test assembly through a refrigerant pipe.

[0030] The enthalpy-increasing circuit test assembly also includes a second subcooler 7. The inlet of the second subcooler 7 is connected to the liquid phase outlet of the flash evaporator 6, and the outlet of the second subcooler 7 is connected to the main circuit test assembly through a refrigerant pipeline.

[0031] Among them, the exhaust port of the compressor under test 1 is equipped with an exhaust temperature sensor and an exhaust pressure sensor to measure the exhaust temperature TD and exhaust pressure PD of the compressor under test 1; at the same time, a pneumatic ball valve UNS1 is installed on the refrigerant pipeline near the exhaust port of the compressor under test 1; a pneumatic ball valve UNS3, a refrigerant mass flow meter FLO1, a valve inlet temperature sensor to measure the main valve inlet temperature TVI, a valve inlet pressure sensor to measure the main valve inlet pressure PVI, and a regulating valve UEW1 to adjust the suction pressure of the compressor under test 1 are installed on the refrigerant pipeline between the first subcooler 5 and the calorimeter 8; a calorimeter temperature sensor and a calorimeter pressure sensor to measure the calorimeter outlet temperature TEO and outlet pressure PEO of the calorimeter 8 are installed at the outlet of the calorimeter 8; a suction temperature sensor and a suction pressure sensor to measure the suction temperature TS and suction pressure PS of the compressor under test 1 are installed at the suction port of the compressor under test 1, and a pneumatic ball valve UNS2 is installed on the refrigerant pipeline near the suction port of the compressor under test 1.

[0032] Specifically, the flash evaporator 6 is equipped with a regulating valve UEW2 at its gas-liquid inlet position to adjust the enthalpy increase pressure of the compressor under test 1; at the same time, the flash evaporator 6 is equipped with an enthalpy increase valve inlet temperature sensor and an enthalpy increase valve inlet pressure sensor to measure the enthalpy increase valve inlet temperature TVI2 and the enthalpy increase valve inlet pressure PVI2; the compressor under test 1 is equipped with an enthalpy increase port position to measure the enthalpy increase temperature Tinj and the enthalpy increase pressure Pinj; the compressor under test 1 is also equipped with a pneumatic ball valve UNS5 at its enthalpy increase port position; and the second subcooler 7 is equipped with a pneumatic ball valve UNS4 at its outlet position.

[0033] In the main circuit test assembly, the refrigerant passes sequentially through the compressor under test 1, condenser 2, liquid receiver 3, filter 4, first subcooler 5, and calorimeter 8, and finally flows back to the compressor under test 1 to complete a complete test circuit. In the enthalpy-increasing circuit test assembly, the refrigerant passes sequentially through the compressor under test 1, condenser 2, liquid receiver 3, filter 4, first subcooler 5, and flash evaporator 6. When the refrigerant passes through the flash evaporator 6, the gaseous refrigerant is output to the compressor under test 1 to complete a complete circuit, while the liquid refrigerant is discharged from the liquid outlet of the flash evaporator 6, passes sequentially through the second subcooler 7 and calorimeter 8, and finally flows back to the compressor under test 1 to complete a complete circuit.

[0034] The flash evaporator 6 is equipped with a level gauge OAF2 to monitor the liquid level in the flash evaporator 6. After the liquid refrigerant flashes through the flash evaporator 6, the gaseous refrigerant is discharged through the gaseous outlet of the flash evaporator 6 until it flows into the compressor 1 under test, and the liquid refrigerant is discharged through the liquid outlet of the flash evaporator 6 to the second subcooler 7 for subcooling.

[0035] The flash evaporator 6 has its gas-liquid inlet connected to the refrigerant pipeline between the first subcooler 5 and the pneumatic ball valve UNS3 via a refrigerant pipeline. The refrigerant pipeline is also equipped with a regulating valve UEW2, a temperature sensor before the enthalpy-increasing valve, a pressure sensor before the enthalpy-increasing valve, and a refrigerant mass flow meter FL02.

[0036] The outlet of the second subcooler 7 is connected via a refrigerant pipe to the refrigerant pipe between the pneumatic ball valve UNS3 and the refrigerant mass flow meter FLO1. Among them, when conducting performance tests on conventional compressors: Refrigerant flow rate through calorimeter 8 The calculation formula, with units of kg / h, is shown in equation (A): (A) Wherein: The electric heating power of calorimeter 8 (obtained by measuring with an electrical power meter); The heat loss of calorimeter 8 (obtained by the temperature difference between the inside and outside of the calorimeter * the heat loss coefficient); The specific enthalpy at the outlet of calorimeter 8 is measured in KJ / Kg (obtained from the refrigerant property table by referring to the outlet temperature TEO and outlet pressure PEO of calorimeter 8). The specific enthalpy is the measured value before the regulating valve UEW1, and the unit is KJ / Kg (obtained from the refrigerant property table by the main valve inlet temperature TVI and the main valve inlet pressure PVI). The measured refrigerant flow rate of the main refrigerant flow meter FLO1 before the regulating valve UEW1 is: The unit is kg / h; Main side cooling capacity The calculation formula, with W as the unit, is shown in equation (B): (B) Among them, To measure the main side cooling capacity of the compressor 1 under specified operating conditions; The theoretical specific enthalpy of the refrigerant entering the compressor 1 under specified operating conditions is expressed in kJ / kg (obtained from the refrigerant property table by referring to the suction temperature TS and suction pressure PS set under operating conditions). The theoretical specific enthalpy of the refrigerant before regulating valve UEW1 under specified operating conditions is given in KJ / Kg (obtained from the refrigerant property table by referring to the temperature and pressure before regulating valve UEW1 under the specified operating conditions). This is the specific volume correction factor for the suction port of the compressor under test. Auxiliary cooling capacity The calculation formula, with W as the unit, is shown in equation (C): (C) Among them, To measure the auxiliary cooling capacity of the tested compressor 1 under specified operating conditions; The measured refrigerant flow rate is for the refrigerant flow meter in the pre-valve liquid path, in kg / h.

[0037] Among them, when conducting performance tests on the enthalpy-increasing compressor with flash evaporator 6: Refrigerant flow rate through calorimeter 8 The calculation formula, with units of kg / h, is shown in equation (D): (D) Wherein: The electric heating power of calorimeter 8 (obtained by measuring with an electrical power meter); The heat loss of calorimeter 8 (obtained by the temperature difference between the inside and outside of the calorimeter * the heat loss coefficient); The specific enthalpy at the outlet of calorimeter 8 is measured in KJ / Kg (obtained from the refrigerant property table by referring to the outlet temperature TEO and outlet pressure PEO of calorimeter 8). The specific enthalpy is the measured value before the regulating valve UEW1, in kJ / kg (obtained from the refrigerant property table by referring to the main valve inlet temperature TVI and the main valve inlet pressure PVI). The measured refrigerant flow rate of the main refrigerant flow meter FLO1 before the regulating valve UEW1 is: The unit is kg / h; Main side cooling capacity The calculation formula, with W as the unit, is shown in equation (E): (E) Among them, The theoretical specific enthalpy of the refrigerant liquid at the refrigerant saturation temperature corresponding to the refrigerant injection pressure of the compressor 1 equipped with calorimeter 8 under specified operating conditions is expressed in kJ / kg. Auxiliary cooling capacity The calculation formula, with W as the unit, is shown in equation (F): (F).

[0038] The working principle of this invention is as follows: after the refrigerant is compressed by the compressor under test, it is discharged. The discharged refrigerant is a high-temperature and high-pressure gaseous refrigerant. It is condensed into a liquid refrigerant by the condenser and adjusted to the discharge pressure of its test target. The condensed liquid refrigerant enters the liquid receiver for buffering. During the buffering process, it plays a buffering role. Then the refrigerant flows through the filter to filter out the water or impurities in the refrigerant, and then enters the first subcooler for subcooling. When testing the performance of a compressor with a flash evaporator and enthalpy-increasing capacity, pneumatic valve UNS3 is closed, and pneumatic valve UNS4 is opened. Level gauge OAF2 monitors the refrigerant level inside the flash evaporator. The gaseous refrigerant from the flash evaporator enters the enthalpy-increasing port of the compressor under test through pneumatic valve UNS5. The liquid refrigerant from the flash evaporator enters the second subcooler from the bottom liquid outlet. After subcooling, it enters the main refrigerant mass flow meter FLO1 for measurement. The flow rate is then adjusted to the target suction pressure PS and target suction temperature TS of the compressor under test via regulating valve UEW1 and a calorimeter, respectively. Finally, it enters the suction port of the compressor under test for compression, and the cycle repeats. At this point, the measured enthalpy-increasing flow rate = refrigerant mass flow meter FLO2 - refrigerant mass flow meter FLO1. When testing the performance of a conventional compressor, first close pneumatic valve UNS5 and regulating valve UEW2, open pneumatic valve UNS4, and close pneumatic valve UNS3. When the liquid level gauge OAF2 monitors that the liquid level in the flash evaporator is lower than the set liquid level height value, close pneumatic valve UNS4 and open pneumatic valve UNS3. Keep pneumatic valve UNS5 and regulating valve UEW2 closed. After the refrigerant enters the main circuit and is measured by refrigerant mass flow meter FLO1, it is adjusted to the target suction pressure PS and target suction temperature TS of the compressor under test through regulating valve UEW1 and calorimeter, respectively. Finally, it enters the suction port of the compressor under test for compression. This cycle repeats. The actual flow rate of the compressor under test is equal to the actual flow rate measured by refrigerant mass flow meter FLO1. The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A flash enhancer augmented compressor test device comprising a compressor under test (1), characterized in that: The first and the last of the measured compressor (1) are connected in series on the main path test assembly through the refrigerant pipeline, and the enthalpy-increasing port of the measured compressor (1) is connected with the refrigerant pipeline of the main path test assembly through the enthalpy-increasing path test assembly; The loop formed by the main path test assembly comprises a condenser (2), a liquid accumulator (3), a filter (4), a first sub-cooler (5) and a calorimeter (8) connected in sequence through the refrigerant pipeline, the condenser (2) is connected with the exhaust port of the measured compressor (1) through the refrigerant pipeline, and the calorimeter (8) is connected with the suction port of the measured compressor (1) through the refrigerant pipeline. The enthalpy-increasing path test assembly comprises a flasher (6), the gas phase outlet of the flasher (6) is connected with the enthalpy-increasing port of the measured compressor (1) through the refrigerant pipeline, and the gas-liquid inlet of the flasher (6) is connected with the refrigerant pipeline of the main path test assembly through the refrigerant pipeline.

2. The flash enhancer augmented compressor test device of claim 1, wherein, The enthalpy-increasing path test assembly further comprises a second sub-cooler (7), the inlet of the second sub-cooler (7) is connected with the liquid phase outlet of the flasher (6), and the outlet of the second sub-cooler (7) is connected to the main path test assembly through the refrigerant pipeline.

3. The flash enhancer augmented compressor test device of claim 2, wherein, The exhaust temperature sensor and the exhaust pressure sensor for measuring the exhaust temperature TD and the exhaust pressure PD of the measured compressor (1) are arranged at the position of the exhaust port of the measured compressor (1), and the pneumatic ball valve UNS1 is arranged on the refrigerant pipeline near the position of the exhaust port of the measured compressor (1); the pneumatic ball valve UNS3, the refrigerant mass flow meter FLO1, the pre-valve temperature sensor for measuring the pre-valve temperature TVI, the pre-valve pressure sensor for measuring the pre-valve pressure PVI and the regulating valve UEW1 for regulating the suction pressure of the measured compressor (1) are arranged on the refrigerant pipeline between the first sub-cooler (5) and the calorimeter (8); the calorimeter temperature sensor and the calorimeter pressure sensor for measuring the outlet temperature TEO and the outlet pressure PEO of the calorimeter (8) are arranged at the outlet position of the calorimeter (8); the suction temperature sensor and the suction pressure sensor for measuring the suction temperature TS and the suction pressure PS of the measured compressor (1) are arranged at the position of the suction port of the measured compressor (1), and the pneumatic ball valve UNS2 is arranged on the refrigerant pipeline near the position of the suction port of the measured compressor (1).

4. The flash enhancer augmented compressor test device of claim 3, wherein, The regulating valve UEW2 for regulating the enthalpy-increasing pressure of the measured compressor (1) is arranged at the position of the gas-liquid inlet of the flasher (6); the pre-valve temperature sensor and the pre-valve pressure sensor for measuring the pre-valve temperature TVI2 and the pre-valve pressure PVI2 of the enthalpy-increasing path are arranged at the position of the gas-liquid inlet of the flasher (6); the enthalpy temperature sensor and the enthalpy pressure sensor for measuring the enthalpy temperature Tinj and the enthalpy pressure Pinj are arranged at the position of the enthalpy-increasing port of the measured compressor (1); and the pneumatic ball valve UNS5 is further arranged at the position of the enthalpy-increasing port of the measured compressor (1); the pneumatic ball valve UNS4 is arranged at the outlet position of the second sub-cooler (7).

5. The flash enhancer augmented compressor test device of claim 4, wherein, In the loop formed by the main road test component, the refrigerant passes through the measured compressor (1), condenser (2), liquid tank (3), filter (4), first subcooler (5) and calorimeter (8) in turn, and finally returns to the measured compressor (1) to complete a complete test loop; in the loop formed by the enthalpy increase test component, the refrigerant passes through the measured compressor (1), condenser (2), liquid tank (3), filter (4), first subcooler (5) and flasher (6) in turn, when the refrigerant passes through the flasher (6), the gas phase refrigerant is output to the measured compressor (1) to complete a complete loop, and the liquid phase refrigerant is discharged from the liquid phase outlet of the flasher (6), passes through the second subcooler (7) and the calorimeter (8) in turn, and finally returns to the measured compressor (1) to complete a complete loop.

6. The flash enhancer augmented compressor test device of claim 5, wherein, The flasher (6) is internally provided with a liquid level meter OAF2 for monitoring the liquid level of the flasher (6); after the liquid refrigerant medium is flashed through the flasher (6), the gas phase refrigerant is discharged from the gas phase outlet of the flasher (6) and flows into the measured compressor (1), and the liquid phase refrigerant is discharged from the liquid phase outlet of the flasher (6) to the second subcooler (7).

7. The flash enhancer augmented compressor test device of claim 6, wherein, The gas-liquid inlet of the flasher (6) is connected to the refrigerant pipeline between the first subcooler (5) and the pneumatic ball valve UNS3 through a refrigerant pipeline, and the refrigerant pipeline is provided with an adjusting valve UEW2, an enthalpy increase valve front temperature sensor, an enthalpy increase valve front pressure sensor and a refrigerant mass flow meter FL02.

8. The flash enhancer augmented compressor test device of claim 7, wherein, The outlet of the second subcooler (7) is connected to the refrigerant pipeline between the pneumatic ball valve UNS3 and the refrigerant mass flow meter FLO1 through a refrigerant pipeline.

9. The flash enhancer augmented compressor test device of claim 8, wherein, When performing a conventional compressor compression performance test: flow rate of the refrigerant flowing through the calorimeter (8) The calculation formula in Kg / h is shown as formula (A): (A) wherein: QH is the calorimeter (8) electric heating power; QL is the calorimeter (8) heat leakage; hmeas is the calorimeter (8) outlet measured specific enthalpy in KJ / Kg; hpre is the pre-regulator valve UEW1 measured specific enthalpy in KJ / Kg; The refrigerant flow rate measured by the refrigerant flow meter FLO1 in the front main passage of the regulating valve UEW1 is Kg / h; Main-side refrigerating capacity The calculation formula in W is shown in Equation (B): (B) wherein, Qmeasured is the measured main side refrigeration capacity of the measured compressor (1) under the specified operating condition; htheoretical is the theoretical specific enthalpy of the refrigerant entering the measured compressor (1) under the specified operating condition, with the unit of KJ / Kg; hbefore is the specific enthalpy of the refrigerant before the adjustment valve UEW1 under the specified operating condition, with the unit of KJ / Kg; Cv is the specific volume correction coefficient of the suction port of the measured compressor (1); secondary-side refrigeration capacity The calculation formula in W is shown as formula (C): (C) wherein, Qmeas is the measured auxiliary-side refrigerating capacity of the compressor (1) under the specified operating condition; Qmeas is the measured auxiliary-side refrigerating capacity of the compressor (1) under the specified operating condition; 10. The flash enhancer augmented compressor test device of claim 9, wherein, When performing an enthalpy increase compressor performance test with a flasher (6): flow rate of the refrigerant flowing through the calorimeter (8) The calculation formula in Kg / h is shown as formula (D): (D) wherein: is the electric heating power of the calorimeter (8); is the heat leakage of the calorimeter (8); is the measured specific enthalpy at the outlet of the calorimeter (8) in KJ / Kg; is the measured specific enthalpy before the regulating valve UEW1 in KJ / Kg; The refrigerant flow rate measured by the refrigerant flow meter FLO1 in the front main passage of the regulating valve UEW1 is Kg / h; Main side refrigeration capacity The calculation formula in W is shown as formula (E): (E) wherein, is the theoretical specific enthalpy of the refrigerant liquid at the saturation temperature corresponding to the measured compressor (1) charge pressure of the compressor (1) with the calorimeter (8) under the specified operating conditions, in KJ / Kg; secondary-side refrigeration capacity The calculation formula in W is shown as formula (F): （F）。

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