Air conditioning oil circulation rate detection system and method

Abstract

The present invention discloses an air-conditioning oil circulation rate detection system, which is characterized by comprising: an operating parameter recording module for recording the operating condition parameters of the air-conditioning system to be tested; a first temperature sensor located at the exhaust port of the air-conditioning system to be tested; a compressor test bench connected to the operating parameter recording module; the compressor test bench comprises: a test compressor, a second temperature sensor, an oil circulation rate detection device and a flow control system; the second temperature sensor is arranged at the exhaust port of the test compressor; the oil circulation rate detection device detects the oil circulation rate of the compressor; the flow control system controls the oil circulation rate of the compressor; and a processing device. The beneficial effects of the present invention are: indirectly obtaining the oil circulation rate of the air-conditioning system by using the compressor test bench avoids the difficulty of adding a detection device in a real vehicle environment in the prior art, and the difficulty of directly detecting the oil circulation rate of the air-conditioning system, thereby improving the efficiency of debugging and optimizing the air-conditioning system and effectively saving manpower.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air conditioners, and in particular to an air conditioner oil circulation rate detection system and method. Background Art

[0002] In the field of automotive air conditioning technology, the oil circulation rate of the air conditioning system directly affects the operating performance and reliability of the air conditioning system. When the oil circulation rate of the compressor is higher than a certain upper limit of the normal range, the heat transfer efficiency of the heat exchanger will decrease. When the oil circulation rate of the compressor is lower than a certain lower limit of the normal range, the power consumption of the compressor will increase, and in severe cases, the compressor will be damaged.

[0003] In the prior art, the oil circulation rate of the air-conditioning system is often detected by sampling, optical testing, ultrasonic testing and other methods in a real vehicle environment. Due to the compact layout of the components of the real vehicle system, it is difficult to add the above-mentioned devices to the vehicle air-conditioning system to detect the oil circulation rate. Summary of the invention

[0004] In view of the above problems existing in the prior art, an air conditioning oil circulation rate detection system is now provided.

[0005] The specific technical solutions are as follows:

[0006] An air conditioning oil circulation rate detection system, comprising:

[0007] An operating parameter recording module is used to record the operating parameters of the air-conditioning system to be tested;

[0008] The operating condition parameters include the suction pressure, suction temperature, rotation speed and exhaust pressure of the air conditioning system to be tested;

[0009] A first temperature sensor is disposed at the exhaust port of the air conditioning system to be tested, and is used to detect the exhaust temperature of the air conditioning system to be tested;

[0010] A compressor test bench, connected to the operating parameter recording module, and operated according to the operating parameters;

[0011] The compressor test bench comprises: a processing device, a test compressor, a second temperature sensor, an oil circulation rate detection device and a flow control system;

[0012] The second temperature sensor is disposed at the exhaust port of the test compressor;

[0013] The oil circulation rate detection device is used to detect the oil circulation rate of the test compressor;

[0014] The flow control system is used to control the oil circulation rate of the test compressor;

[0015] A processing device is connected to the first temperature sensor, the test compressor, the second temperature sensor, the oil circulation rate detection device and the flow control system.

[0016] Preferably, the processing device is connected to the second temperature sensor and receives data from the second temperature sensor;

[0017] The processing device compares the data of the first temperature sensor with the data of the second temperature sensor, and adjusts the flow control system according to the comparison result.

[0018] Preferably, the compressor test bench is provided with an oil-gas separator;

[0019] The oil-gas separator is connected to the exhaust port of the test compressor.

[0020] Preferably, the oil circulation rate detection device is connected to the lubricating oil output end of the oil-gas separator.

[0021] Preferably, the oil circulation rate detection device further includes an optical sensor, an ultrasonic sensor or a sampler.

[0022] Preferably, when the oil circulation rate detection device is the optical sensor, the ultrasonic sensor or the sampler, the oil circulation rate detection device is connected to the subcooler output end of the compressor test bench.

[0023] A method for detecting an oil circulation rate, comprising:

[0024] S1: Start the air conditioning system to be tested to a predetermined speed and record the operating parameters;

[0025] S2: a first temperature sensor detects a first exhaust temperature of the air conditioning system to be tested;

[0026] S3: starting the test compressor according to the operating condition parameters, and the second temperature sensor detecting the second exhaust temperature of the test compressor;

[0027] S4: the processing device compares the first exhaust temperature and the second exhaust temperature, and adjusts the flow control system on the lubricating oil circulation pipeline of the test compressor until the first exhaust temperature is equal to the second exhaust temperature;

[0028] S5: The oil circulation rate detection device detects the oil circulation rate of the test compressor.

[0029] Preferably, the oil circulation rate of the air-conditioning system to be tested is equal to the oil circulation rate of the test compressor.

[0030] Preferably, step S4 comprises:

[0031] S41: The processing device compares the data of the first temperature sensor with the data of the second temperature sensor;

[0032] S42: when the data of the first temperature sensor is higher than the data of the second temperature sensor, reducing the flow rate of the flow control system;

[0033] When the data of the first temperature sensor is lower than the data of the second temperature sensor, increasing the flow rate of the flow control system;

[0034] S43: Repeat the above process until the data of the first temperature sensor is equal to the data of the second temperature sensor.

[0035] The above technical solution has the following advantages or beneficial effects: by indirectly obtaining the oil circulation rate of the air-conditioning system by setting up a compressor test bench, the difficulty of directly detecting the oil circulation rate of the air-conditioning system by adding a detection device in a real vehicle environment in the prior art is avoided, the efficiency of debugging and optimizing the air-conditioning system is improved, and manpower is effectively saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0037] Figure 1 It is an overall schematic diagram of an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of a detection method according to an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a compressor test bench according to another embodiment of the present invention;

[0040] Figure 4 A schematic diagram of a vehicle air conditioning system according to another embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the relationship between the oil circulation rate and the exhaust temperature in an embodiment of the present invention;

[0042] Figure 6 This is another compressor test bench according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0046] The present invention comprises:

[0047] An air conditioning oil circulation rate detection system, such as Figure 1 As shown, it includes: a first temperature sensor 11, which is arranged at the exhaust port of the air-conditioning system 1 to be tested, and is used to detect the exhaust temperature of the air-conditioning system 1 to be tested. This exhaust temperature is used to adjust the test compressor 21 in the compressor test bench 2 so that the two compressors work at the same oil circulation rate; a processing device 25, which is connected to the first temperature sensor 11 and receives data from the first temperature sensor 11, and is used to adjust the oil circulation rate of the test compressor 21 according to the exhaust temperature of the air-conditioning system 1 to be tested detected by the first temperature sensor 11, and detect the oil circulation rate of the test compressor 21 to indirectly obtain the oil circulation rate of the air-conditioning system 1 to be tested; operating parameters The recording module 12 is used to record the operating parameters of the air-conditioning system 1 to be tested; the compressor test bench 2 is connected to the operating parameter recording module 12, and starts the test compressor 21 according to the operating parameters. The test compressor 21 is also connected to the processing device 25, receives instructions issued by the processing device 25, and adjusts the flow control system 23 according to the instructions issued by the processing device 25, and feeds back the exhaust temperature of the test compressor 21 to the processing device 25, so that the processing device 25 can further issue instructions to adjust the test compressor 21; the oil circulation rate detection device 24 is connected to the compressor test bench 2, and is used to detect the oil circulation rate of the test compressor 21.

[0048] Specifically, the operating condition parameters include the suction pressure, suction temperature, rotation speed, and exhaust pressure of the air conditioning system 1 to be tested.

[0049] Specifically, the test compressor 21 in the compressor test bench 2 is provided with a flow control system 23 on the lubricating oil circulation loop, which can control the flow of the lubricating oil circulation loop according to the signal sent by the processing device 25, thereby actively adjusting the oil circulation rate of the test compressor 21, so as to indirectly obtain the oil circulation rate of the air-conditioning system 1 to be tested by detecting the oil circulation rate of the test compressor 21.

[0050] In a preferred embodiment, the compressor test bench 2 includes a processing device 25, an oil circulation rate detection device 24, a test compressor 21, a second temperature sensor 22 and a flow control system 23; the flow control system 23 is used to adjust the oil circulation rate of the test compressor according to the instructions issued by the processing device 25, and the second temperature sensor 22 detects the exhaust temperature of the test compressor 21 and feeds back the exhaust temperature to the processing device 25.

[0051] In a preferred embodiment, the processing device 25 is connected to the second temperature sensor 22 and receives data from the second temperature sensor 22 for adjusting the test compressor 21 according to the exhaust temperature of the test compressor 21 fed back by the second temperature sensor 22 .

[0052] In a preferred embodiment, the processing device 25 compares the data of the first temperature sensor 11 with the data of the second temperature sensor 22, and adjusts the flow control system 23 in the test compressor 21 according to the comparison result. The adjustment process includes: comparing the data of the first temperature sensor 11 with the data of the second temperature sensor 22, when the data of the first temperature sensor 11 is higher than the data of the second temperature sensor 22, reducing the flow of the flow control system 23; when the data of the first temperature sensor 11 is lower than the data of the second temperature sensor 22, increasing the flow of the flow control system 23; repeating the above process multiple times until the data of the first temperature sensor 11 is equal to the data of the second temperature sensor 22.

[0053] Through the above control method, the exhaust temperature of the test compressor 21 can be adjusted according to the exhaust temperature of the air-conditioning system 1 to be tested, thereby making the oil circulation rate of the air-conditioning system 1 to be tested equal to the oil circulation rate of the test compressor 21.

[0054] In a preferred embodiment, the air conditioning system 1 to be tested and the test compressor 21 use compressors of the same specification.

[0055] By setting compressors of the same specifications, the working conditions of the air-conditioning system 1 to be tested and the test compressor 21 can be the same when they reach the same rotation speed or power. The oil circulation rate of the air-conditioning system 1 to be tested can be indirectly obtained through the test compressor 21, which is convenient for R&D personnel to confirm whether the air-conditioning system 1 to be tested has reached the expected design indicators.

[0056] In a preferred embodiment, the test compressor 21 is connected to an oil-gas separator provided on the compressor test bench 2, and the oil circulation rate detection device 24 is connected to the oil-gas separator. Specifically, the lubricating oil mixed in the high-temperature and high-pressure steam discharged from the compressor is separated by the oil-gas separator, so that the oil circulation rate of the test compressor 21 can be effectively detected.

[0057] In a preferred embodiment, the oil circulation rate detection device 24 also includes an optical sensor, an ultrasonic sensor or a sampler. Specifically, by connecting the optical sensor, ultrasonic sensor or sampler to the subcooler output end of the compressor test bench 2, the refrigerant-lubricating oil mixture flowing therethrough can be analyzed to obtain the proportion of lubricating oil in the refrigerant-lubricating oil mixture, and the circulation rate of the lubricating oil can be obtained in combination with the refrigerant-lubricating oil mixture flow rate measured by the flowmeter.

[0058] In a preferred embodiment, the detection system is used to detect the oil circulation rate of the air conditioning system, such as Figure 2 As shown, specifically including:

[0059] S1: Start the air conditioning system 1 to be tested to a predetermined speed and record the operating parameters;

[0060] S2: The first temperature sensor detects the exhaust temperature T1 of the air conditioning system 1 to be tested;

[0061] S3: starting the test compressor 21 according to the operating parameters, and the second temperature sensor 22 detecting the exhaust temperature T2 of the test compressor;

[0062] S4: the processing device 25 compares the exhaust gas temperatures T1 and T2, and adjusts the oil circulation rate of the test compressor 21 through the flow control system 23 until T1 is equal to T2;

[0063] S5 : The oil circulation rate detection device 24 detects the oil circulation rate of the test compressor 21 .

[0064] In a preferred embodiment, step S4 includes:

[0065] S41: The processing device 25 compares the data of the first temperature sensor 11 with the data of the second temperature sensor 22, and when the data of the first temperature sensor 11 is higher than the data of the second temperature sensor 22, reduces the flow rate of the flow control system 23;

[0066] S42: when the data of the first temperature sensor 11 is lower than the data of the second temperature sensor 22, increasing the flow rate of the flow control system 23;

[0067] S43 : Repeat the above process until the data of the first temperature sensor 11 is equal to the data of the second temperature sensor 22 .

[0068] In a preferred embodiment, by setting the air-conditioning system 1 to be tested and the test compressor 21 to operate at the same speed, it can be ensured that the operating conditions of the air-conditioning system 1 to be tested and the test compressor 21 are basically consistent, and the data of the first temperature sensor 11 and the data of the second temperature sensor 22 are compared by the processing device 25, and the flow control system 23 is adjusted, so that the air-conditioning system 1 to be tested and the test compressor 21 obtain the same oil circulation rate under the same operating conditions. At this time, the oil circulation rate of the test compressor 21 can be detected to more accurately obtain the oil circulation rate of the air-conditioning system 1 to be tested, which is convenient for the tester to further optimize the air-conditioning system 1 to be tested according to the oil circulation rate.

[0069] In a preferred embodiment, the air-conditioning oil circulation rate detection system detects that the oil circulation rate of the air-conditioning system 1 to be tested at a rotation speed of 7000 rpm is 2%, which is consistent with the actual situation.

[0070] In a preferred embodiment, Figure 3 As shown, the compressor test bench is equipped with: test compressor A1, fan A2, compressor chamber A3, condenser A4, high-pressure liquid storage A5, subcooler A6, electronic expansion valve A7, calorimeter chamber A8, calorimeter A9, evaporator A10, refrigerant A11, first electric heater A12, oil separator A13, second electric heater A14, oil flow control valve A15, first mass flow meter AG1, second mass flow meter AG2, and d is the exhaust port of the test compressor, where the exhaust temperature T2 of the test compressor is measured. Figure 4 As shown, the vehicle air conditioning system includes: a compressor B1, a condenser B2, an expansion valve B3, an evaporator B4, and a first temperature sensor B5. The first temperature sensor B5 is arranged at the output end of the compressor B1 and is used to detect the exhaust temperature T1 of the compressor B1.

[0071] In this embodiment, the compressor test bench starts the test compressor A1 according to the suction pressure, suction temperature, rotation speed, and exhaust pressure of the vehicle air conditioning system and adjusts it to the corresponding operating parameters. Then, the refrigerant-lubricating oil liquid-gas mixture discharged from the test compressor A1 is separated at the oil separator A13, and input into the refrigerant circulation loop and the lubricating oil circulation loop respectively. After the refrigerant completes the liquefaction-gasification cycle through the condenser A4, the high-pressure liquid storage A5, the subcooler A6, the electronic expansion valve A7, and the evaporator A10, it flows back to the inlet S of the test compressor A1 and is remixed with the lubricating oil into a liquid-gas mixture and enters the test compressor A1. The lubricating oil is separated at the oil separator A13, and flows back to the inlet S of the test compressor A1 through the second mass flowmeter AG2 and the oil flow control valve A15. According to Figure 5It can be seen that there is a linear relationship between the oil circulation rate and the exhaust temperature. By adjusting the oil flow control valve A15 and continuously detecting the temperature at d, the exhaust temperature T1 is equal to the exhaust temperature T2. At this time, since the suction pressure, suction temperature, speed, exhaust pressure and exhaust temperature of the test compressor A1 and the compressor B1 are the same, it can be considered that the test compressor A1 and the compressor B1 are working under completely consistent working conditions. Therefore, the oil circulation rate measured by the second mass flowmeter AG2 is equal to the oil circulation rate of the compressor B1.

[0072] In another embodiment, if Figure 6 As shown, the compressor test bench does not have an oil separator. In this case, a measuring point AT1 can be set in front of the first mass flowmeter AG1. An optical sensor, an ultrasonic sensor or a refrigerant-lubricant mixture is set there, or the refrigerant-lubricant mixture is sampled to obtain the proportion of lubricant in the refrigerant-lubricant mixture, and the circulation rate of the lubricant is calculated in combination with the refrigerant-lubricant mixture flow measured by the first mass flowmeter AG1.

[0073] The beneficial effects of the present invention are as follows: by indirectly obtaining the oil circulation rate of the air-conditioning system by borrowing the compressor test bench, the difficulty of directly detecting the oil circulation rate of the air-conditioning system by adding a detection device in a real vehicle environment in the prior art is avoided, the efficiency of debugging and optimizing the air-conditioning system is improved, and manpower is effectively saved.

[0074] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioning oil circulation rate detection system, characterized in that: include: An operating parameter recording module is used to record the operating parameters of the air-conditioning system to be tested; The operating condition parameters include the suction pressure, suction temperature, rotation speed and exhaust pressure of the air conditioning system to be tested; A first temperature sensor is disposed at the exhaust port of the air conditioning system to be tested, and is used to detect the exhaust temperature of the air conditioning system to be tested; A compressor test bench, connected to the operating parameter recording module, and operated according to the operating parameters; The compressor test bench comprises: a processing device, a test compressor, a second temperature sensor, an oil circulation rate detection device and a flow control system; The second temperature sensor is disposed at the exhaust port of the test compressor; The oil circulation rate detection device is used to detect the oil circulation rate of the test compressor; The flow control system is used to control the oil circulation rate of the test compressor; A processing device is connected to the first temperature sensor, the test compressor, the second temperature sensor, the oil circulation rate detection device and the flow control system.

2. The detection system according to claim 1, characterized in that: The processing device is connected to the second temperature sensor and receives data from the second temperature sensor; The processing device compares the data of the first temperature sensor with the data of the second temperature sensor, and adjusts the flow control system according to the comparison result.

3. The detection system according to claim 2, characterized in that: The compressor test bench is provided with an oil-gas separator; The oil-gas separator is connected to the exhaust port of the test compressor.

4. The detection system according to claim 3, characterized in that: The oil circulation rate detection device is connected to the lubricating oil output end of the oil-gas separator.

5. The detection system according to claim 2, characterized in that: The oil circulation rate detection device also includes an optical sensor, an ultrasonic sensor or a sampler.

6. The detection system according to claim 5, characterized in that: When the oil circulation rate detection device is the optical sensor, the ultrasonic sensor or the sampler, the oil circulation rate detection device is connected to the subcooler output end of the compressor test bench.

7. A method for detecting oil circulation rate, characterized in that: A detection system applicable to any one of claims 1 to 6, comprising: S1: Start the air conditioning system to be tested to a predetermined speed and record the operating parameters; S2: a first temperature sensor detects a first exhaust temperature of the air conditioning system to be tested; S3: starting the test compressor according to the operating condition parameters, and the second temperature sensor detecting the second exhaust temperature of the test compressor; S4: the processing device compares the first exhaust temperature and the second exhaust temperature, and adjusts the flow control system on the lubricating oil circulation pipeline of the test compressor until the first exhaust temperature is equal to the second exhaust temperature; S5: The oil circulation rate detection device detects the oil circulation rate of the test compressor.

8. The detection method according to claim 7, characterized in that: The oil circulation rate of the air conditioning system to be tested is equal to the oil circulation rate of the test compressor.

9. The detection method according to claim 7, characterized in that: The step S4 comprises: S41: The processing device compares the data of the first temperature sensor with the data of the second temperature sensor; S42: when the data of the first temperature sensor is higher than the data of the second temperature sensor, reducing the flow rate of the flow control system; When the data of the first temperature sensor is lower than the data of the second temperature sensor, increasing the flow rate of the flow control system; S43: Repeat the above process until the data of the first temperature sensor is equal to the data of the second temperature sensor.

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