Compressor testing system and testing method

Abstract

The application discloses a kind of compressor test system and test method, wherein the compressor test system includes: condenser, evaporator;Wherein, the refrigerant inlet of condenser is connected with the exhaust port of the measured compressor, and the refrigerant outlet of evaporator is connected with the suction port of the measured compressor;First throttling device, between the pipeline of measured compressor and evaporator;Second throttling device, between the pipeline of evaporator and measured compressor;Heating device, on the suction port side of measured compressor, for adjusting the suction temperature of measured compressor.The application solves the problem that the test result of compressor parameter in the prior art is not accurate enough, and the test result is more reliable, and the test cost is lower.

Description

Technical Field

[0001] This invention relates to the field of compressor testing technology, and more specifically, to a compressor testing system and testing method. Background Technology

[0002] In food processing, refrigeration, and refrigerated transportation, cryogenic compressor units are used to cool meat, fish, eggs, vegetables, and fruits in cold storage facilities and refrigerated ships. In the petrochemical industry, cryogenic compressor units are used in conjunction with industrial evaporators for processes such as gas liquefaction, gas separation, and the waxing of fuel oil and lubricating oil. Furthermore, cryogenic compressor units are essential in medical applications and low-temperature testing, demonstrating their wide range of uses.

[0003] A common characteristic of cryogenic compressor units is that they are not equipped with evaporators, and the evaporation temperature is below zero degrees Celsius. Because the evaporation temperature of these units is below 0°C, ethylene glycol or other refrigerants are typically used in the testing system to prevent freezing, increasing testing costs. Furthermore, due to the low evaporation temperature of cryogenic units, the target suction temperature required for testing is usually not reached, causing changes in the suction port status of the compressor unit under test and affecting the accuracy of performance testing.

[0004] There is currently no effective solution to the problem of inaccurate compressor parameter test results in related technologies. Summary of the Invention

[0005] This invention provides a compressor testing system and method to at least solve the problem that the test results of compressor parameters in the prior art are not accurate enough.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, a compressor testing system is provided, comprising:

[0007] Condenser and evaporator; wherein, the refrigerant inlet of the condenser is connected to the discharge port of the compressor under test, and the refrigerant outlet of the evaporator is connected to the suction port of the compressor under test;

[0008] The first throttling device is located on the pipeline between the compressor and the evaporator being tested;

[0009] The second throttling device is located on the pipeline between the evaporator and the compressor under test;

[0010] The heating device, located on the suction port side of the compressor under test, is used to adjust the suction temperature of the compressor under test.

[0011] Furthermore, it also includes:

[0012] The liquid injection pipeline has one end connected to the first connection point located between the second throttling device and the compressor under test, and the other end connected to the second connection point located between the first throttling device and the compressor under test;

[0013] The liquid injection solenoid valve, located on the liquid injection pipeline, is used to regulate the suction temperature of the compressor under test.

[0014] Furthermore, it also includes:

[0015] The first temperature sensor is located at the refrigerant outlet of the evaporator and is used to detect the evaporator outlet temperature.

[0016] The first pressure sensor, located at the refrigerant outlet of the evaporator, is used to detect the evaporator outlet pressure;

[0017] The second temperature sensor is located at the suction port of the compressor under test and is used to detect the suction temperature of the compressor under test.

[0018] The second pressure sensor is located at the suction port of the compressor under test and is used to detect the suction pressure of the compressor under test.

[0019] Furthermore, the refrigerant in the compressor testing system is water, and the first throttling device is used to adjust the saturation temperature corresponding to the evaporator outlet pressure to be greater than 0°C.

[0020] According to another aspect of the present invention, a compressor testing method is provided, applied to the compressor testing system as described above, the method comprising:

[0021] Obtain the evaporator outlet temperature and evaporator outlet pressure, and adjust the opening of the first throttling device according to the evaporator outlet temperature and evaporator outlet pressure;

[0022] The system acquires the suction temperature and suction pressure of the compressor under test, and adjusts the operation of the second throttling device, the liquid injection solenoid valve, and the electric heating device based on these parameters.

[0023] Furthermore, adjusting the opening degree of the first throttling device according to the evaporator outlet temperature and evaporator outlet pressure includes:

[0024] Adjust the first throttling device so that the saturation temperature corresponding to the evaporator outlet pressure is greater than the first preset temperature; wherein, the preset temperature is the critical temperature at which the refrigerant freezes.

[0025] Calculate the evaporator outlet superheat based on the evaporator outlet temperature and saturation temperature;

[0026] Adjust the first throttling device to ensure that the superheat at the evaporator outlet meets the preset temperature condition.

[0027] Furthermore, the superheat at the evaporator outlet is equal to the difference between the evaporator outlet temperature and the saturation temperature; the preset temperature conditions include: when the evaporator is a flooded evaporator, the superheat at the evaporator outlet is less than the second preset temperature; when the evaporator is a dry evaporator, the superheat at the evaporator outlet is greater than or equal to the second preset temperature.

[0028] Further, the suction temperature and suction pressure of the compressor under test are obtained, and the operation of the second throttling device, the liquid injection solenoid valve, and the electric heating device are adjusted according to the suction temperature and suction pressure of the compressor under test, including:

[0029] Obtain the target inspiratory temperature and target inspiratory pressure;

[0030] Adjust the opening of the second throttling device to make the compressor suction pressure reach the target suction pressure;

[0031] After the compressor suction pressure reaches the target suction pressure, the operation of the liquid injection solenoid valve and the electric heating device is adjusted according to the target suction temperature and the suction temperature of the compressor being measured.

[0032] Furthermore, adjusting the operation of the liquid injection solenoid valve and the electric heating device according to the target suction temperature and the suction temperature of the compressor under test includes:

[0033] Adjust the opening degree of the injection solenoid valve according to the target intake temperature and the intake temperature of the compressor being tested;

[0034] The suction temperature of the compressor under test is re-detected. When the suction temperature of the compressor under test meets the preset adjustment conditions, the operation of the electric heating device is adjusted according to the target suction temperature and the suction temperature of the compressor under test.

[0035] Furthermore, adjusting the opening degree of the liquid injection solenoid valve according to the target suction temperature and the suction temperature of the compressor under test includes:

[0036] The compressor suction temperature t was measured continuously within a first preset time period. 吸气 ≥t 目标吸气 When +a is applied, the solenoid valve for liquid injection is opened; where 'a' is the preset temperature difference.

[0037] The compressor suction temperature t was measured continuously within a first preset time period. 吸气 ≤t 目标吸气 When -a is selected, the control solenoid valve for liquid injection is closed;

[0038] In t 目标吸气 -a<t 吸气 <t 目标吸气 When +a, the solenoid valve for spraying liquid is kept at a constant opening.

[0039] Furthermore, the preset adjustment condition is t. 吸气 <t 目标吸气-a; Adjust the operation of the electric heating device according to the target suction temperature and the suction temperature of the compressor being measured, including:

[0040] The electric heating device is turned on to ensure that the suction temperature of the compressor under test meets the following condition: t 目标吸气 -a<t 吸气 <t 目标吸气 +a.

[0041] Furthermore, after adjusting the operation of the electric heating device according to the target suction temperature and the suction temperature of the compressor being measured, the following steps are also included:

[0042] Obtain the operating power of the electric heating device;

[0043] The main cooling capacity and auxiliary cooling capacity of the compressor under test are calculated based on the operating power to verify the cooling capacity. The main cooling capacity is calculated as follows: main cooling capacity = chilled water flow rate × chilled water inlet and outlet temperature difference - operating power. Auxiliary cooling capacity is calculated as follows: cooling water flow rate × cooling water inlet and outlet temperature difference - operating power - input power.

[0044] According to another aspect of the present invention, a storage medium comprising computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the compressor testing method as described above.

[0045] This invention provides a compressor testing system that employs a two-stage throttling method, namely, testing with a first throttling device and a second throttling device. The saturation temperature corresponding to the evaporator outlet pressure is adjusted by the first throttling, and the suction temperature of the compressor under test is controlled by the second throttling and heating device in combination. This avoids the suction temperature from failing to reach the target suction temperature required for the test, which would cause changes in the suction port state of the compressor under test and affect the performance test results, thus ensuring the accuracy of the compressor test results. Attached Figure Description

[0046] Figure 1 This is an optional structural schematic diagram of a compressor testing system according to an embodiment of the present invention;

[0047] Figure 2 This is an optional flowchart of a compressor testing method according to an embodiment of the present invention. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims. Example 1

[0049] In a preferred embodiment 1 of the present invention, a compressor testing system is provided, specifically... Figure 1 This diagram illustrates one possible structural design of the system, such as... Figure 1 As shown, the system includes:

[0050] Condenser 1 and evaporator 2; wherein, the refrigerant inlet of condenser 1 is connected to the exhaust port of the compressor under test 3, and the refrigerant outlet of evaporator 2 is connected to the suction port of the compressor under test 3.

[0051] The first throttling device 4 is located on the pipeline between the compressor 3 and the evaporator 2 under test;

[0052] The second throttling device 5 is located on the pipeline between the evaporator 2 and the compressor 3 under test;

[0053] The heating device 6 is located on the suction port side of the compressor under test 3 and is used to adjust the suction temperature of the compressor under test.

[0054] In the above embodiments, a compressor testing system is provided, which adopts a two-stage throttling method, namely, a first throttling device and a second throttling device for testing. The saturation temperature corresponding to the evaporator outlet pressure is adjusted by the first throttling, and the suction temperature of the compressor under test is controlled by the second throttling and the heating device. This avoids the suction temperature from failing to reach the target suction temperature required for testing, which would cause changes in the suction port state of the compressor under test and affect the performance test results, thus ensuring the accuracy of the compressor test results.

[0055] like Figure 1 As shown, the system also includes: a liquid injection pipeline, one end of which is connected to a first connection point located between the second throttling device 5 and the compressor under test 3, and the other end of which is connected to a second connection point located between the first throttling device 4 and the compressor under test 3; and a liquid injection solenoid valve 7, located on the liquid injection pipeline, for adjusting the suction temperature of the compressor under test.

[0056] This system also includes sensors for detecting temperature and pressure, including:

[0057] The first temperature sensor 8 is located at the refrigerant outlet of the evaporator 2 and is used to detect the evaporator outlet temperature.

[0058] The first pressure sensor 9 is located at the refrigerant outlet of the evaporator 2 and is used to detect the evaporator outlet pressure.

[0059] The second temperature sensor 10 is located at the suction port of the compressor 3 under test and is used to detect the suction temperature of the compressor under test.

[0060] The second pressure sensor 11 is located at the suction port of the compressor 3 under test and is used to detect the suction pressure of the compressor under test.

[0061] As shown in the figure, this system is also equipped with an economizer 12, an expansion valve 13, and a flow meter 14.

[0062] In this system, the refrigerant for the compressor testing system is water. The first throttling device is used to adjust the saturation temperature corresponding to the evaporator outlet pressure to be greater than 0°C to prevent the refrigerant from freezing, thereby reducing the testing cost. In addition, the addition of liquid spraying and heating devices, combined with the control of the suction temperature, ensures the accuracy and economy of the low-temperature compressor unit test. Example 2

[0063] In a preferred embodiment 2 of the present invention, a compressor testing method is provided, which is applied to the compressor testing system in embodiment 1 described above. Specifically, Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S204:

[0064] S202: Obtain the evaporator outlet temperature and evaporator outlet pressure, and adjust the opening of the first throttling device according to the evaporator outlet temperature and evaporator outlet pressure;

[0065] S204: Obtain the suction temperature and suction pressure of the compressor under test, and adjust the operation of the second throttling device, the liquid injection solenoid valve and the electric heating device according to the suction temperature and suction pressure of the compressor under test.

[0066] In the above embodiments, a compressor testing system is provided, which adopts a two-stage throttling method, namely, a first throttling device and a second throttling device for testing. The saturation temperature corresponding to the evaporator outlet pressure is adjusted by the first throttling, and the suction temperature of the compressor under test is controlled by the second throttling and the heating device. This avoids the suction temperature from failing to reach the target suction temperature required for testing, which would cause changes in the suction port state of the compressor under test and affect the performance test results, thus ensuring the accuracy of the compressor test results.

[0067] In a preferred embodiment of the present invention, the chilled water pump and cooling water pump are started, and the compressor under test is turned on. Then, the opening of the first throttling device is adjusted according to the evaporator outlet temperature and evaporator outlet pressure. Specifically, this includes: adjusting the first throttling device so that the saturation temperature corresponding to the evaporator outlet pressure is greater than a first preset temperature; wherein, the preset temperature is the critical temperature for the refrigerant to freeze, preventing the refrigerant from freezing; when the refrigerant is water, the preset temperature is 0°C. The evaporator outlet superheat is calculated based on the evaporator outlet temperature and the saturation temperature; the evaporator outlet superheat is equal to the difference between the evaporator outlet temperature and the saturation temperature; the first throttling device is adjusted so that the evaporator outlet superheat meets the preset temperature condition; when the evaporator is a flooded evaporator, the evaporator outlet superheat is less than a second preset temperature; when the evaporator is a dry evaporator, the evaporator outlet superheat is greater than or equal to the second preset temperature; wherein, the second preset temperature can be set according to the compressor model, etc., and optionally the second preset temperature is 1°C.

[0068] After the first throttling device is adjusted, the second throttling device is adjusted, including: acquiring the suction temperature and suction pressure of the compressor under test; adjusting the operation of the second throttling device, the liquid injection solenoid valve, and the electric heating device according to the suction temperature and suction pressure of the compressor under test; specifically: acquiring the target suction temperature and target suction pressure; adjusting the opening of the second throttling device to make the compressor suction pressure reach the target suction pressure; and after the compressor suction pressure reaches the target suction pressure, adjusting the operation of the liquid injection solenoid valve and the electric heating device according to the target suction temperature and the suction temperature of the compressor under test.

[0069] The operation of the liquid injection solenoid valve and the electric heating device is adjusted according to the target suction temperature and the suction temperature of the compressor under test, including: adjusting the opening degree of the liquid injection solenoid valve according to the target suction temperature and the suction temperature of the compressor under test, including: adjusting the suction temperature t of the compressor under test within a continuous first preset time period. 吸气 ≥t 目标吸气 When +a, the liquid injection solenoid valve is opened; where 'a' is the preset temperature difference; and the compressor suction temperature t is measured within a first preset time period. 吸气 ≤t 目标吸气 When -a, the control injection solenoid valve is closed; at t 目标吸气 -a<t 吸气 <t 目标吸气 When +a, the solenoid valve for spraying liquid is kept at a constant opening.

[0070] After adjusting the opening of the liquid injection solenoid valve, the suction temperature of the compressor under test is re-detected. When the suction temperature of the compressor under test meets the preset adjustment conditions, the operation of the electric heating device is adjusted according to the target suction temperature and the suction temperature of the compressor under test. The preset adjustment condition is t. 吸气 <t 目标吸气-a; The specific adjustment process includes: controlling the electric heating device to turn on so that the suction temperature of the compressor under test meets the following condition: t 目标吸气 -a<t 吸气 <t 目标吸气 +a.

[0071] After adjusting the operation of the electric heating device according to the target suction temperature and the suction temperature of the compressor under test, the process also includes: obtaining the operating power of the electric heating device; calculating the main side cooling capacity and auxiliary side cooling capacity of the compressor under test based on the operating power, so as to verify the cooling capacity; wherein, the main side cooling capacity = chilled water flow rate × chilled water inlet and outlet temperature difference - operating power, and the auxiliary side cooling capacity = cooling water flow rate × cooling water inlet and outlet temperature difference - operating power - input power.

[0072] This invention utilizes water as a refrigerant and employs a secondary throttling method to test the compressor unit under test. Simultaneously, to achieve the target superheat, liquid is sprayed and heated during the suction process to reach the target suction temperature. Furthermore, the main and auxiliary refrigeration capacities are verified, resulting in more reliable test results. Example 3

[0073] Based on the compressor testing method provided in Embodiment 2 above, in a preferred embodiment 3 of the present invention, a storage medium containing computer-executable instructions is also provided, which, when executed by a computer processor, are used to perform the compressor testing method as described above.

[0074] In the above embodiments, a compressor testing system is provided, which adopts a two-stage throttling method, namely, a first throttling device and a second throttling device for testing. The saturation temperature corresponding to the evaporator outlet pressure is adjusted by the first throttling, and the suction temperature of the compressor under test is controlled by the second throttling and the heating device. This avoids the suction temperature from failing to reach the target suction temperature required for testing, which would cause changes in the suction port state of the compressor under test and affect the performance test results, thus ensuring the accuracy of the compressor test results.

[0075] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0076] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A compressor testing system, characterized in that, include: Condenser (1), evaporator (2); wherein, the refrigerant inlet of the condenser (1) is connected to the exhaust port of the compressor under test (3), and the refrigerant outlet of the evaporator (2) is connected to the suction port of the compressor under test (3); The first throttling device (4) is located on the pipeline between the compressor (3) under test and the evaporator (2); The second throttling device (5) is located on the pipeline between the evaporator (2) and the compressor under test (3); Heating device (6) is located on the suction port side of the compressor under test (3) and is used to adjust the suction temperature of the compressor under test; The liquid injection pipeline has one end connected to the first connection point between the second throttling device (5) and the compressor under test (3), and the other end connected to the second connection point between the first throttling device (4) and the compressor under test (3); The liquid injection solenoid valve (7) is located on the liquid injection pipeline and is used to adjust the suction temperature of the compressor under test; The compressor testing system is tested using the following method: Obtain the evaporator outlet temperature and evaporator outlet pressure, and adjust the opening of the first throttling device according to the evaporator outlet temperature and evaporator outlet pressure; The suction temperature and suction pressure of the compressor under test are obtained, and the operation of the second throttling device, the liquid injection solenoid valve and the electric heating device are adjusted according to the suction temperature and suction pressure of the compressor under test. The method of adjusting the opening of the first throttling device according to the evaporator outlet temperature and the evaporator outlet pressure includes: adjusting the first throttling device so that the saturation temperature corresponding to the evaporator outlet pressure is greater than a first preset temperature; wherein the preset temperature is the critical temperature for the refrigerant to freeze; calculating the evaporator outlet superheat according to the evaporator outlet temperature and the saturation temperature; and adjusting the first throttling device so that the evaporator outlet superheat meets the preset temperature condition.

2. The compressor testing system according to claim 1, characterized in that, Also includes: The first temperature sensor (8) is located at the refrigerant outlet of the evaporator (2) and is used to detect the evaporator outlet temperature; The first pressure sensor (9) is located at the refrigerant outlet of the evaporator (2) and is used to detect the evaporator outlet pressure; The second temperature sensor (10) is located at the suction port of the compressor under test (3) and is used to detect the suction temperature of the compressor under test. The second pressure sensor (11) is located at the suction port of the compressor under test (3) and is used to detect the suction pressure of the compressor under test.

3. The compressor testing system according to claim 1, characterized in that, The refrigerant of the compressor test system is water, and the first throttling device (4) is used to adjust the saturation temperature corresponding to the evaporator outlet pressure to be greater than 0°C.

4. A compressor testing method, applied to the compressor testing system as described in any one of claims 1-3, characterized in that, The superheat at the evaporator outlet is equal to the difference between the evaporator outlet temperature and the saturation temperature; the preset temperature conditions include: when the evaporator is a flooded evaporator, the superheat at the evaporator outlet is less than a second preset temperature; when the evaporator is a dry evaporator, the superheat at the evaporator outlet is greater than or equal to the second preset temperature.

5. The method according to claim 4, characterized in that, Acquire the suction temperature and suction pressure of the compressor under test, and adjust the operation of the second throttling device, the liquid injection solenoid valve, and the electric heating device according to the suction temperature and suction pressure of the compressor under test, including: Obtain the target inspiratory temperature and target inspiratory pressure; Adjust the opening of the second throttling device so that the compressor suction pressure reaches the target suction pressure; After the compressor suction pressure reaches the target suction pressure, the operation of the liquid injection solenoid valve and the electric heating device is adjusted according to the target suction temperature and the measured compressor suction temperature.

6. The method according to claim 5, characterized in that, Adjusting the operation of the liquid injection solenoid valve and the electric heating device according to the target intake temperature and the measured compressor intake temperature includes: The opening degree of the liquid injection solenoid valve is adjusted according to the target intake temperature and the intake temperature of the compressor under test; The suction temperature of the compressor under test is re-detected. When the suction temperature of the compressor under test meets the preset adjustment conditions, the operation of the electric heating device is adjusted according to the target suction temperature and the suction temperature of the compressor under test.

7. The method according to claim 6, characterized in that, Adjusting the opening degree of the liquid injection solenoid valve according to the target intake temperature and the intake temperature of the compressor under test includes: The measured compressor suction temperature t within a continuous first preset time period 吸气 ≥t 目标吸气 When +a, the liquid injection solenoid valve is opened; where a is a preset temperature difference. The measured compressor suction temperature t within a continuous first preset time period 吸气 ≤t 目标吸气 When -a is selected, the liquid injection solenoid valve is closed. In t 目标吸气 -a<t 吸气 <t 目标吸气 When +a, the solenoid valve for spraying liquid is kept at a constant opening.

8. The method according to claim 7, characterized in that, The preset adjustment condition is t. 吸气 <t 目标吸气 -a; Adjusting the operation of the electric heating device according to the target intake temperature and the measured compressor intake temperature includes: The electric heating device is turned on so that the suction temperature of the compressor under test meets the following condition: t 目标吸气 -a<t 吸气 <t 目标吸气 +a.

9. The method according to claim 8, characterized in that, After adjusting the operation of the electric heating device according to the target intake temperature and the intake temperature of the compressor under test, the method further includes: Obtain the operating power of the electric heating device; The main cooling capacity and auxiliary cooling capacity of the compressor under test are calculated based on the operating power to verify the cooling capacity; wherein, the main cooling capacity = chilled water flow rate × chilled water inlet and outlet temperature difference - operating power, and the auxiliary cooling capacity = cooling water flow rate × cooling water inlet and outlet temperature difference - operating power - input power.

10. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the compressor testing method as described in any one of claims 4 to 9.

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