A test switching mechanism and its application, a test system, and a test method.

Abstract

A test switching mechanism, its application, test system, and test method are disclosed. The mechanism includes a test switching mechanism; an intake channel connected to the intake end of the compressor; an exhaust channel connected to the exhaust end of the compressor, including a high-pressure branch line and a low-pressure branch line; a control channel connected to the control end of the compressor, wherein the high-pressure and low-pressure branch lines of the exhaust channel are respectively connected to the control channel via channel valves; and an enthalpy-increasing channel connected to the enthalpy-increasing end of the compressor. This invention switches the compressor's operating state by switching the air pressure in the control channel and controlling the variable-capacity pin. By monitoring changes in the compressor's operating conditions during the switching process and comparing the stable operating conditions with the set values, compressor faults can be detected. By controlling the air pressure in the control channel through the high-pressure and low-pressure branch lines, normal compressors can switch normally, while abnormal compressors cannot switch, thus revealing faults abnormally in a short time.

Description

Technical Field

[0001] This invention relates to the field of testing three-cylinder two-stage variable capacity compressors, and in particular to a testing switching mechanism for the performance of a three-cylinder two-stage variable capacity compressor, its application, testing system, and testing method. Background Technology

[0002] For the newly structured three-cylinder two-stage variable capacity compressor, the testing items are more numerous and complicated than those for ordinary compressors. Currently, there is a lack of fault detection and evaluation of the performance of three-cylinder two-stage variable capacity compressors in the domestic compressor industry, making it impossible to completely detect the faults of this compressor. Summary of the Invention

[0003] To address one or more of the aforementioned problems, this invention provides a test switching mechanism and its application, a test system, and a test method. By switching the working state of the compressor, the operating conditions of the compressor are monitored, and faults in the upper, middle, and lower cylinders are effectively detected.

[0004] To achieve the above objectives, the present invention employs the following technical solution: a test switching mechanism, disposed on at least one cylinder of the compressor, comprising:

[0005] The reverse-mounted sliding vane has a pin groove on one side that abuts against the lower partition of a cylinder, with one end of the left and right ends located in the intake passage and the other end located in the control passage.

[0006] A variable displacement pin has an elastic element disposed at its tail and a protruding post disposed at its head. The top surface of the protruding post is abutted against the side of the sliding plate away from the pin groove by the force of the elastic element. The tail of the variable displacement pin is located in the intake channel and the head is located in the control channel.

[0007] Preferably, the head of the variable displacement pin is connected to the control channel of the test system so that the air pressure of the control channel generates a first force F1 toward the tail of the variable displacement pin.

[0008] The tail of the variable displacement pin is connected to the air intake channel of the test system so that the air pressure in the air intake channel generates a second force F2 on the variable displacement pin in the opposite direction to the first force F1.

[0009] The first and second forces are adjusted by controlling the air pressure in the intake channel and the control channel, so that the variable displacement pin slides in the direction of the force.

[0010] Prior to this, the variable displacement pin is also subjected to its own gravity G and the elastic force F6 generated by the elastic element. The direction of gravity G is the same as the first force F1, and the direction of elastic force F6 is the same as the second force F2.

[0011] Preferably, one end of the sliding plate is connected to the air intake channel of the test system, so that the air pressure of the air intake channel generates a third force F3 on the sliding plate toward the other end. In the direction of the third force, the sliding plate is also subjected to a fourth force F4 generated by friction with the variable displacement pin.

[0012] The other end of the sliding plate is connected to the control channel of the test system so that the air pressure of the control channel generates a fifth force F5 on the sliding plate in the opposite direction to the third force.

[0013] The third, fourth, and fifth forces are adjusted by controlling the air pressure in the intake and control channels, so that the sliding plate slides in the direction of the forces.

[0014] Prior to this, in dual-cylinder mode, the sliding vane is also subjected to a reaction force N from the lower partition and a positive pressure N' from the variable displacement pin. The reaction force N is in the same direction as the gravity of the variable displacement pin, and the positive pressure N' is in the opposite direction to the reaction force N.

[0015] On the other hand, an application of a test switching mechanism includes configuring the test switching mechanism in the lower cylinder of the three-cylinder two-stage variable displacement compressor.

[0016] When the pressure difference Δp between the control channel pressure p1 and the intake channel pressure p2 is greater than 0.15MPa, the variable displacement pin slides away from the lower slide and unlocks the lower slide, and the compressor operates in three-cylinder mode.

[0017] When the pressure difference Δp between the control channel pressure p1 and the suction channel pressure p2 is less than 0.15MPa, the variable displacement pin slides towards the lower slide and locks the lower slide. The compressor operates in dual-cylinder mode. Under the condition of dual-cylinder operation, the lower slide is subjected to a fifth force F5 from the control channel pressure, which is greater than the third force F3 from the suction channel pressure and the fourth force F4 from the sliding friction of the variable displacement pin.

[0018] Prioritizing the compressor's operation, to ensure it operates only in three-cylinder mode when the variable displacement pin fails, the fifth force F5 must be greater than the third force F3 + the fourth force F4 in two-cylinder operation. Based on the aforementioned inequality and the formula for calculating the third force of sliding friction, F3 = μN (where μ is the coefficient of sliding friction), the calculation model for the control channel air pressure is as follows:

[0019] Twin-cylinder mode:

[0020] Three-cylinder mode: p2 + 0.15 < p1.

[0021] On the other hand, a test system for a test switching mechanism includes:

[0022] Test switching mechanism;

[0023] The intake channel is connected to the intake end of the compressor;

[0024] An exhaust passage, connected to the exhaust end of the compressor, includes a high-pressure branch line and a low-pressure branch line;

[0025] The control channel is connected to the control terminal of the compressor, and the high-pressure branch pipe and low-pressure branch pipe of the exhaust channel are respectively connected to the control channel through channel valves;

[0026] The enthalpy-increasing channel is connected to the enthalpy-increasing end of the compressor.

[0027] Preferably, the testing system includes:

[0028] The intake channel is used to provide an air source to generate air pressure to exert force on the compressor and the test switching mechanism. It is connected to the intake pressure transmitter through the air pipe from the intake end and then splits into two pipelines. One pipeline is connected to the intake valve and the pressure reducing valve in sequence, and the other pipeline is connected to the check valve, the air supply valve, the filter pressure reducing valve, and the filter oil removal storage tank in sequence.

[0029] The exhaust channel, used for exhausting air, is connected in sequence from the exhaust end to an exhaust pressure transmitter, a pressure protector, a pressure relief valve, an oil separator, and an exhaust valve via an air pipe. After passing through the pressure relief valve, it also includes a low-pressure branch line and a high-pressure branch line. The low-pressure branch line is connected to the control channel through a low-pressure valve and a pressure reducing valve, and the high-pressure branch line is connected to the control channel through a high-pressure valve.

[0030] The control channel is used to control the air pressure so as to control the air pressure to exert force on the test switching mechanism. It is connected to the high-pressure branch line and the low-pressure branch line through the air pipe connection channel valve from the control end, and a pressure relief valve is also provided at the connection point to the air intake channel.

[0031] An enthalpy-increasing channel, used for increasing enthalpy, is connected in sequence from the enthalpy-increasing end to an enthalpy-increasing pressure transmitter, an enthalpy-increasing valve, and an exhaust purifier via a gas pipe. After passing through an exhaust pressure regulator, the exhaust channel has a branch pipe that connects to the exhaust purifier via an unloading valve.

[0032] Preferably, the testing system further includes:

[0033] The self-testing circulation channel connects the intake channel and the exhaust channel to form an internal circulation for testing the airtightness of the system. The exhaust valve condenser and the system pressure transmitter of the exhaust channel are connected to the pressure reducing valve of the intake channel.

[0034] On the other hand, a testing method for a testing switching mechanism includes the following steps:

[0035] Initiate a test system for testing switching mechanisms;

[0036] The pressure is increased through the inhalation channel, and the pressure increase time is recorded after the preset pressure is reached.

[0037] Open the low-pressure branch line of the exhaust passage and close the high-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into the first dual-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions to obtain the first judgment result.

[0038] Open the high-pressure branch line of the exhaust passage and close the low-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into three-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions to obtain the second judgment result.

[0039] Open the low-pressure branch line of the exhaust passage and close the high-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into the second dual-cylinder mode. After the operating conditions stabilize, record the operating conditions, stop the compressor, perform a reverse flow test to determine the third judgment result.

[0040] Preferably, the test method further includes the following test steps:

[0041] Start the test system, close the intake valve of the intake channel, the pressure relief valve and high pressure valve of the exhaust channel, the pressure relief valve of the control channel, and the enthalpy increase valve of the enthalpy increase channel, open the air supply valve of the intake channel, the exhaust valve and low pressure valve of the exhaust channel, and the channel valve of the control channel. The compressor performs a pressure increase test, and after reaching the preset pressure, the pressure increase time is recorded. The result of the compressor's compression capacity test is obtained by comparing it with the preset standard time.

[0042] Preferably, the test method further includes the following test steps:

[0043] After the pressurization action is completed, the intake valve of the intake passage is opened and the supplementary air valve of the intake passage is closed. At this time, the low-pressure branch line of the exhaust passage is connected to the control passage, so that the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder are locked by the air pressure of the control passage, and the first dual-cylinder mode is entered. After the working condition stabilizes, the working condition is recorded and compared with the preset standard working condition, including at least the following first judgment result:

[0044] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will have no sliding vanes.

[0045] If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

[0046] Preferably, the test method further includes the following test steps:

[0047] Under stable operating conditions in the first dual-cylinder mode, open the high-pressure valve of the high-pressure branch line and close the low-pressure valve of the low-pressure branch line to unlock the variable displacement pin and sliding vane of the test switching structure configured in the lower cylinder under the control of air pressure, and enter the three-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions, including at least the following second judgment results:

[0048] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will have no sliding vanes.

[0049] If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

[0050] Preferably, the test method further includes the following test steps:

[0051] Under stable operating conditions in three-cylinder mode, open the low-pressure valve of the low-pressure branch line and close the high-pressure valve of the high-pressure branch line to lock the air pressure in the controlled channel of the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder, and enter the second dual-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions, including at least the following third judgment results:

[0052] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will have no sliding vanes.

[0053] If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

[0054] Preferably, the test method further includes the following test steps: under the stable operating condition of the second dual-cylinder mode, the compressor stops running, and the intake channel and exhaust channel are connected by the self-test circulation channel to form an internal circulation for testing the air tightness of the system. A backflow test is performed to obtain a fourth judgment result, which includes at least: if the backflow pressure is greater than the preset backflow pressure value, then there is air leakage in the enthalpy channel and / or intake channel.

[0055] Preferably, the test method further includes the following test steps:

[0056] The stable operating conditions recorded in the first dual-cylinder mode are compared with the stable operating conditions recorded in the three-cylinder mode to obtain a fifth judgment result, which includes at least: if the operating conditions are basically the same, then the control channel is blocked.

[0057] Preferably, the test method further includes the following test steps:

[0058] The stable operating conditions recorded in the three-cylinder mode are compared with the stable operating conditions recorded in the second two-cylinder mode to obtain a sixth judgment result, which includes at least one of the following: if the operating conditions are basically the same, then there is a fault in the lower cylinder, the variable displacement pin, or the elastic element of the variable displacement pin.

[0059] Compared to existing technologies, this invention offers the following advantages: By switching the air pressure in the control channel, the variable-capacity pin is controlled, thereby switching the compressor's operating state. Furthermore, by monitoring changes in the compressor's operating conditions during the switching process and comparing the stable operating condition with the set value, compressor faults can be detected. By controlling the air pressure in the control channel through high-pressure and low-pressure branch lines, precise calculation of the variable-capacity pressure enables accurate variable-capacity switching. This allows normal compressors to switch normally, while abnormal compressors cannot switch, thus revealing faults and anomalies in a short time. Attached Figure Description

[0060] To more clearly illustrate the technical solution, the accompanying drawings used in 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.

[0061] Figure 1 This is a schematic diagram of the test switching mechanism of the present invention.

[0062] Figure 2 This is a schematic diagram of the force-bearing structure of the variable displacement pin of the present invention.

[0063] Figure 3 This is a schematic diagram of the force-bearing structure of the sliding plate of the present invention.

[0064] Figure 4 This is a schematic diagram of the pipeline structure of the test system of the present invention.

[0065] Figure 5 This is a schematic diagram of the testing method of the present invention. Detailed Implementation

[0066] In order to clearly and completely understand the technical solution, the present invention will be further described in conjunction with the embodiments and accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] Implementation Case 1

[0068] like Figure 1 As shown, a test switching mechanism for the performance of a three-cylinder, two-stage variable-capacity compressor is configured on at least one cylinder of the compressor, comprising:

[0069] The reverse-mounted sliding vane 100 has a side with a pin groove 101 that abuts against the lower partition plate 102 of a cylinder, with one end of the left and right ends located in the intake passage and the other end located in the control passage.

[0070] The variable displacement pin 200 has an elastic element 201 disposed at the tail and a protruding column 202 disposed at the head. The top surface of the protruding column 202 is abutted against the other side of the sliding plate 100 away from the pin groove 101 by the force of the elastic element 201. The tail of the variable displacement pin is located in the air intake channel and the head is located in the control channel.

[0071] like Figure 2 As shown, the head of the variable displacement pin 200 is connected to the control channel of the test system so that the air pressure of the control channel generates a first force F1 toward the tail of the variable displacement pin.

[0072] The tail of the variable displacement pin 200 is connected to the air intake channel of the test system so that the air pressure in the air intake channel generates a second force F2 on the variable displacement pin in the opposite direction to the first force F1. The variable displacement pin is also subjected to its own weight G and the elastic force F6 generated by the elastic element. The direction of the weight G is the same as the first force F1, and the direction of the elastic force F6 is the same as the second force F2.

[0073] The first and second forces are adjusted by controlling the air pressure in the intake and control channels to allow the variable displacement pin to slide in the direction of the forces. Specifically, when the pressure difference Δp between the control channel air pressure p1 and the intake channel air pressure p2 is greater than 0.15 MPa, the variable displacement pin 200 slides away from the sliding plate 100 and unlocks the sliding plate 100; when the pressure difference Δp between the control channel air pressure p1 and the intake channel air pressure p2 is less than 0.15 MPa, and this pressure difference is insufficient to overcome the sum of the elastic force F6 and gravity G generated by the elastic element, the variable displacement pin 200 slides towards the sliding plate 100 and locks the sliding plate 100.

[0074] like Figure 3 As shown, one end of the sliding plate 200 is connected to the air intake channel of the test system, so that the air pressure of the air intake channel generates a third force F3 on the sliding plate 100 toward the other end. In the direction of the third force, the sliding plate 100 is also subjected to a fourth force F4 generated by friction with the variable displacement pin.

[0075] The other end of the sliding plate 100 is connected to the control channel of the test system so that the air pressure of the control channel generates a fifth force F5 on the sliding plate 100 in the opposite direction to the third force. In the dual-cylinder mode, the sliding plate 100 is also subjected to the reaction force N of the lower partition and the positive pressure N' of the variable displacement pin. The reaction force N is in the same direction as the gravity of the variable displacement pin, and the positive pressure N' is in the opposite direction to the reaction force N.

[0076] The third, fourth, and fifth forces are adjusted by controlling the air pressure in the intake and control channels to make the sliding plate slide in the direction of the forces. Specifically, when the pressure difference Δp between the air pressure p1 in the control channel and the air pressure p2 in the intake channel is greater than 0.15 MPa, the variable displacement pin slides away from the sliding plate 100 and unlocks the sliding plate 100. The sliding plate 100 is pushed towards the direction of the fifth force F5 by the air pressure P1 in the control channel. When the pressure difference Δp between the air pressure p1 in the control channel and the air pressure p2 in the intake channel is less than 0.15 MPa, the variable displacement pin is insufficient to counteract the elastic force F6 exerted by the elastic element on it, generating a fourth force F4 of sliding friction on the sliding plate. This causes the air pressure P2 in the intake channel to push the sliding plate 100 towards the direction of the third force F3, and the variable displacement pin generates a positive pressure N' on the sliding plate, thereby locking the sliding plate.

[0077] Based on the test switching mechanism in this embodiment, a test switching mechanism for the performance of a three-cylinder two-stage variable capacity compressor is further obtained, including the test switching mechanism being configured in the lower cylinder of the three-cylinder two-stage variable capacity compressor.

[0078] When the pressure difference Δp between the control channel pressure p1 and the intake channel pressure p2 is greater than 0.15MPa, the variable displacement pin slides away from the lower slide and unlocks the lower slide, and the compressor operates in three-cylinder mode.

[0079] When the pressure difference Δp between the control channel pressure p1 and the suction channel pressure p2 is less than 0.15MPa, the variable displacement pin slides towards the lower slide and locks the lower slide. The compressor operates in dual-cylinder mode. Under the condition of dual-cylinder operation, the lower slide is subjected to a fifth force F5 from the control channel pressure, which is greater than the third force F3 from the suction channel pressure and the fourth force F4 from the sliding friction of the variable displacement pin.

[0080] To ensure that the compressor operates only in three-cylinder mode when the variable displacement pin fails, it is necessary to satisfy the condition that the fifth force F5 is greater than the third force F3 + the fourth force F4 under the condition of two-cylinder operation. This results in the inequality F5 > F3 + F4. Based on the above inequality and the calculation formula for the third force of sliding friction F3 = μN (μ is the coefficient of sliding friction), the calculation model for the air pressure in the control channel is obtained as follows:

[0081] Twin-cylinder mode:

[0082] Three-cylinder mode: p2 + 0.15 < p1.

[0083] like Figure 4 As shown, based on the calculation model and Figure 4 The system piping shown includes an intake channel 10, an exhaust channel 20, a control channel 30, and an enthalpy-increasing channel 40. The control channel 40, which controls the compressor's operating mode, controls the compressor's exhaust pressure to reduce air supply usage. According to the dual-cylinder mode formula in the calculation model, the pressure in the control channel 40 in dual-cylinder mode should be within a certain range. Between p2+0.15, the system pipeline uses a pressure reducing valve to reduce the pressure of the compressor exhaust gas to achieve this pressure. According to the three-cylinder mode formula in the calculation model, the control channel pressure in the three-cylinder mode should be greater than p2+0.15. Therefore, the system pipeline directly uses the compressor exhaust pressure to achieve this pressure. By controlling the variable capacity control channel pressure with a high-precision pressure reducing valve, the precisely calculated variable capacity pressure enables accurate variable capacity switching. This allows normal machines to switch normally, while abnormal machines cannot switch, thus revealing the fault abnormality in a short time.

[0084] Implementation Case 2:

[0085] like Figure 4 As shown, a test system for the performance of a three-cylinder two-stage variable displacement compressor includes:

[0086] The test switching mechanism is configured on the lower cylinder of the compressor;

[0087] The intake channel 10 is connected to the intake end a of the compressor;

[0088] The exhaust passage 20 is connected to the exhaust end b of the compressor and includes a high-pressure branch line and a low-pressure branch line;

[0089] The control channel 30 is connected to the control terminal c of the compressor. The high-pressure branch pipe and the low-pressure branch pipe of the exhaust channel are respectively connected to the control channel through channel valves.

[0090] The enthalpy-increasing channel 40 is connected to the enthalpy-increasing end d of the compressor.

[0091] Specifically:

[0092] The intake channel 10 is used to provide an air source to generate air pressure to exert force on the compressor and the test switching mechanism. It is connected to the intake pressure transmitter 11 through the intake end a via an air pipe and then splits into two pipelines. One pipeline is connected to the intake valve 12 and the pressure reducing valve 13 in sequence, and the other pipeline is connected to the check valve 14, the air supply valve 15, the filter pressure reducing valve 16, and the filter oil removal storage tank 17 in sequence.

[0093] The exhaust channel 20 is used for exhausting air. It is connected in sequence from the exhaust end b to the exhaust pressure transmitter 21, pressure protector 22, pressure relief valve 23, oil separator 24, and exhaust valve 25 through the air pipe. After the pressure relief valve 23, it also includes a low-pressure branch line and a high-pressure branch line. The low-pressure branch line is connected to the control channel 30 through the low-pressure valve 26 and the pressure reducing valve 27. The high-pressure branch line is connected to the control channel 30 through the high-pressure valve 28.

[0094] The control channel 30 is used to control the air pressure so as to control the air pressure to generate force on the test switching mechanism. It is connected to the high pressure branch and the low pressure branch through the control terminal c via the air pipe to the control pipeline pressure transmitter 31 channel valve 32. The connection point also has a pressure relief valve 33 connected to the air intake channel 10.

[0095] The enthalpy-increasing channel 40 is used for enthalpy increase. It is connected in sequence from the enthalpy-increasing end d to the enthalpy-increasing pressure transmitter 41, the enthalpy-increasing valve 42, and the exhaust purifier 43 via a gas pipe. After passing through the exhaust pressure changer 21, the exhaust channel 20 has a branch pipe that is connected to the exhaust purifier 43 via the unloading valve 29.

[0096] This implementation case switches the compressor's operating state by controlling the variable displacement pin through the switching of air pressure in the control channel. By monitoring the changes in the compressor's operating conditions during the switching process and comparing the stable operating conditions with the set values, the compressor's faults can be detected.

[0097] This implementation also includes a self-testing circulation channel 50, which connects the intake channel 10 and the exhaust channel 20 to form an internal circulation for testing the system's airtightness. The exhaust valve 25, condenser 51, and system pressure transmitter 52 of the exhaust channel 20 are connected to the pressure reducing valve 13 of the intake channel 10. The self-testing circulation channel only requires connecting the intake and exhaust channels to put the system pipeline into an internal circulation state. Based on the ideal gas law PV=nRT and the law of conservation of mass, the required pipeline volumes for the intake and exhaust sections of the system pipeline can be calculated. The system pipeline is designed and laid out based on the results. After the compressor's exhaust pressure reaches the target pressure, the replenishment channel is cut off, and the system pipeline enters a stable circulation operation state. The system's airtightness is judged by the pipeline air pressure. If the air pressure continuously decreases, the system's airtightness is poor; conversely, if it increases, the system's airtightness is good.

[0098] Implementation Case 3:

[0099] like Figure 4 and Figure 5 As shown, a test method for the performance of a three-cylinder two-stage variable capacity compressor is proposed. By comparing the operating conditions of a normal compressor and various types of faulty compressors in the system pipeline, a fault detection algorithm is designed to record and determine whether the operating conditions of the compressor under different modes are within the normal process range. By comparing the operating conditions of the compressor under different modes, the compressor faults are detected, realizing the quantitative judgment of the test method, which makes it easier for operators to understand and judge the compressor operating conditions more intuitively.

[0100] The testing method specifically includes the following steps:

[0101] S1, start a test system for the performance of a three-cylinder two-stage variable capacity compressor, close the intake valve 12 of the intake channel 10, the pressure relief valve 23 and high pressure valve 28 of the exhaust channel 20, the pressure relief valve 33 of the control channel 30, and the enthalpy increase valve 42 of the enthalpy increase channel 40, open the air supply valve 15 of the intake channel 10, the exhaust valve 25 and low pressure valve 26 of the exhaust channel 20, and the channel valve 32 of the control channel 30, the compressor performs a pressure increase test, and after reaching the preset pressure, the pressure increase time is recorded, and the test result of the compressor's compression capacity is obtained by comparing it with the preset standard time;

[0102] S2, open the low-pressure branch line of the exhaust passage and close the high-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into the first dual-cylinder mode. After the working condition is stable, record the working condition and compare it with the preset standard working condition to obtain the first judgment result.

[0103] Specifically, after the pressurization action is completed, the intake valve 12 of the intake passage 10 is opened, and the supplementary air valve 15 of the intake passage is closed. At this time, the low-pressure branch line of the exhaust passage 20 is connected to the control channel, so that the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder are locked by the air pressure of the control channel, and the first dual-cylinder mode is entered. After the working condition stabilizes, the working condition is recorded and compared with the preset standard working condition for judgment, including at least the following first judgment result:

[0104] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane; if the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the middle cylinder will malfunction.

[0105] S3, open the high-pressure branch line of the exhaust passage and close the low-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into three-cylinder mode. After the working condition is stable, record the working condition and compare it with the preset standard working condition to obtain the second judgment result.

[0106] Specifically, under stable operating conditions in the first dual-cylinder mode, the high-pressure valve 28 of the high-pressure branch line is opened and the low-pressure valve 26 of the low-pressure branch line is closed, so that the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder are unlocked by the air pressure of the control channel, and the three-cylinder mode is entered. After the operating conditions stabilize, the operating conditions are recorded and compared with the preset standard operating conditions, including at least the following second judgment results:

[0107] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane; if the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the middle cylinder will malfunction.

[0108] S4, open the low-pressure branch line of the exhaust channel and close the high-pressure branch line to adjust the air pressure of the control channel so that the test switching mechanism puts the compressor into the second dual-cylinder mode. After the working condition is stable, record the working condition, stop the compressor, perform a reverse flow test to determine the third judgment result.

[0109] Specifically, under stable operating conditions in the three-cylinder mode, the low-pressure valve 26 of the low-pressure branch line is opened and the high-pressure valve 28 of the high-pressure branch line is closed, so that the air pressure in the controlled channel of the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder is locked, and the second dual-cylinder mode is entered. After the operating conditions stabilize, the operating conditions are recorded and compared with the preset standard operating conditions, including at least the following first judgment results:

[0110] If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane; if the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the middle cylinder will malfunction.

[0111] S5, under the stable operating condition of the second dual-cylinder mode, the compressor stops running, and the intake channel 10 and exhaust channel 20 are connected by the self-test circulation channel 50 to form an internal circulation for testing the air tightness of the system, performing a backflow test to obtain a fourth judgment result, which includes at least: if the backflow pressure is greater than the preset backflow pressure value, then there is air leakage in the enthalpy channel and / or intake channel.

[0112] S6, compare the stable operating conditions recorded in the first dual-cylinder mode with the stable operating conditions recorded in the three-cylinder mode to obtain a fifth judgment result, which includes at least: if the operating conditions are basically the same, then the control channel is blocked.

[0113] S7, the stable operating conditions recorded in the three-cylinder mode are compared with the stable operating conditions recorded in the second two-cylinder mode to obtain a sixth judgment result, which includes at least: if the operating conditions are basically the same, then at least one of the following is a fault: the lower cylinder, the variable displacement pin, or the elastic element of the variable displacement pin.

[0114] The above disclosures are merely one or more preferred embodiments of the present invention, intended to help understand the inventive concept of the technical solution, and are not intended to limit the present invention in any other way. Any other equivalent or conventional substitution schemes made by those skilled in the art based on the features defined by the present invention shall still fall within the scope of the present invention.

Claims

1. A testing and switching mechanism for the performance of a three-cylinder, two-stage variable-capacity compressor, configured on at least one cylinder of the compressor, characterized in that... include: The reverse-mounted sliding vane has a pin groove on one side that abuts against the lower partition of a cylinder, with one end of the left and right ends located in the intake passage and the other end located in the control passage. A variable displacement pin has an elastic element disposed at the tail and a protruding post disposed at the head. The top surface of the protruding post is abutted against the side of the sliding plate away from the pin groove by the force of the elastic element. The tail of the variable displacement pin is located in the intake channel and the head is located in the control channel. The head of the variable displacement pin is connected to the control channel of the test system so that the air pressure of the control channel generates a first force F1 toward the tail of the variable displacement pin. The tail of the variable displacement pin is connected to the air intake channel of the test system so that the air pressure in the air intake channel generates a second force F2 on the variable displacement pin in the opposite direction to the first force. The first and second forces are adjusted by controlling the air pressure in the intake channel and the control channel, so that the variable displacement pin slides in the direction of the force. One end of the sliding plate is connected to the air intake channel of the test system, so that the air pressure of the air intake channel generates a third force F3 on the sliding plate toward the other end. In the direction of the third force, the sliding plate is also subjected to a fourth force F4 generated by friction with the variable displacement pin. The other end of the sliding plate is connected to the control channel of the test system so that the air pressure of the control channel generates a fifth force F5 on the sliding plate in the opposite direction to the third force. The third, fourth, and fifth forces are adjusted by controlling the air pressure in the intake and control channels, so that the sliding plate slides in the direction of the forces.

2. An application of a testing and switching mechanism for the performance of a three-cylinder, two-stage variable-capacity compressor, characterized in that: The test switching mechanism as described in claim 1 is configured in the lower cylinder of the three-cylinder two-stage variable displacement compressor; When the pressure difference Δp between the control channel pressure p1 and the intake channel pressure p2 is greater than 0.15MPa, the variable displacement pin slides away from the lower slide and unlocks the lower slide, and the compressor operates in three-cylinder mode. When the pressure difference Δp between the control channel air pressure p1 and the suction channel air pressure p2 is less than 0.15MPa, the variable displacement pin slides towards the lower slide and locks the lower slide. The compressor operates in dual-cylinder mode. Under the condition of dual-cylinder operation, the lower slide is subjected to a fifth force F5 from the control channel air pressure, which is greater than the third force F3 from the suction channel air pressure and the fourth force F4 from the sliding friction of the variable displacement pin.

3. The application of the testing and switching mechanism for the performance of a three-cylinder two-stage variable displacement compressor according to claim 2, characterized in that: The calculation model for the control channel air pressure includes: ; ； Where μ is the coefficient of sliding friction.

4. A performance testing system for a three-cylinder, two-stage variable-capacity compressor, comprising the test switching mechanism as described in claim 1, characterized in that... Also includes: The intake channel is connected to the intake end of the compressor; An exhaust passage, connected to the exhaust end of the compressor, includes a high-pressure branch line and a low-pressure branch line; The control channel is connected to the control terminal of the compressor, and the high-pressure branch pipe and low-pressure branch pipe of the exhaust channel are respectively connected to the control channel through channel valves; The enthalpy-increasing channel is connected to the enthalpy-increasing end of the compressor.

5. The performance testing system for a three-cylinder, two-stage variable displacement compressor according to claim 4, characterized in that, include: The intake channel is used to provide an air source to generate air pressure to exert force on the compressor and the test switching mechanism. It is connected to the intake pressure transmitter through the air pipe from the intake end and then splits into two pipelines. One pipeline is connected to the intake valve and the pressure reducing valve in sequence, and the other pipeline is connected to the check valve, the air supply valve, the filter pressure reducing valve, and the filter oil removal storage tank in sequence. The exhaust channel, used for exhausting air, is connected in sequence from the exhaust end to an exhaust pressure transmitter, a pressure protector, a pressure relief valve, an oil separator, and an exhaust valve via an air pipe. After passing through the pressure relief valve, it also includes a low-pressure branch line and a high-pressure branch line. The low-pressure branch line is connected to the control channel through a low-pressure valve and a pressure reducing valve, and the high-pressure branch line is connected to the control channel through a high-pressure valve. The control channel is used to control the air pressure so as to control the air pressure to exert force on the test switching mechanism. It is connected to the high-pressure branch line and the low-pressure branch line through the air pipe connection channel valve from the control end, and a pressure relief valve is also provided at the connection point to the air intake channel. An enthalpy-increasing channel, used for increasing enthalpy, is connected in sequence from the enthalpy-increasing end to an enthalpy-increasing pressure transmitter, an enthalpy-increasing valve, and an exhaust purifier via a gas pipe. After passing through an exhaust pressure regulator, the exhaust channel has a branch pipe that connects to the exhaust purifier via an unloading valve.

6. A test system for the performance of a three-cylinder two-stage variable displacement compressor according to claim 4 or 5, characterized in that, Also includes: The self-testing circulation channel connects the intake channel and the exhaust channel to form an internal circulation for testing the airtightness of the system. The exhaust valve condenser and the system pressure transmitter of the exhaust channel are connected to the pressure reducing valve of the intake channel.

7. A method for testing the performance of a three-cylinder, two-stage variable displacement compressor, characterized in that... Includes the following steps: Initiate the performance testing system of the three-cylinder two-stage variable displacement compressor as described in any one of claims 4-6; The pressure is increased through the inhalation channel, and the pressure increase time is recorded after the preset pressure is reached. Open the low-pressure branch line of the exhaust passage and close the high-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into the first dual-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions to obtain the first judgment result. Open the high-pressure branch line of the exhaust passage and close the low-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into three-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions to obtain the second judgment result. Open the low-pressure branch line of the exhaust passage and close the high-pressure branch line to adjust the air pressure of the control passage so that the test switching mechanism puts the compressor into the second dual-cylinder mode. After the operating conditions stabilize, record the operating conditions, stop the compressor, perform a reverse flow test to determine the third judgment result.

8. The method for testing the performance of a three-cylinder two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: Start the test system, close the intake valve of the intake channel, the pressure relief valve and high pressure valve of the exhaust channel, the pressure relief valve of the control channel, and the enthalpy increase valve of the enthalpy increase channel, open the air supply valve of the intake channel, the exhaust valve and low pressure valve of the exhaust channel, and the channel valve of the control channel. The compressor performs a pressure increase test, and after reaching the preset pressure, the pressure increase time is recorded. The result of the compressor's compression capacity test is obtained by comparing it with the preset standard time.

9. The method for testing the performance of a three-cylinder two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: After the pressurization action is completed, the intake valve of the intake passage is opened and the supplementary air valve of the intake passage is closed. At this time, the low-pressure branch line of the exhaust passage is connected to the control passage, so that the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder are locked by the air pressure of the control passage, and the first dual-cylinder mode is entered. After the working condition stabilizes, the working condition is recorded and compared with the preset standard working condition, including at least the following first judgment result: If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane. If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

10. A method for testing the performance of a three-cylinder, two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: Under stable operating conditions in the first dual-cylinder mode, open the high-pressure valve of the high-pressure branch line and close the low-pressure valve of the low-pressure branch line to unlock the variable displacement pin and sliding vane of the test switching structure configured in the lower cylinder under the control of air pressure, and enter the three-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions, including at least the following second judgment results: If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane. If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

11. The method for testing the performance of a three-cylinder two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: Under stable operating conditions in three-cylinder mode, open the low-pressure valve of the low-pressure branch line and close the high-pressure valve of the high-pressure branch line to lock the air pressure in the controlled channel of the variable displacement pin and the sliding vane of the test switching structure configured in the lower cylinder, and enter the second dual-cylinder mode. After the operating conditions stabilize, record the operating conditions and compare them with the preset standard operating conditions, including at least the following third judgment results: If the pressure in the enthalpy-increasing channel is greater than the preset standard operating condition, the upper cylinder will malfunction or the middle cylinder will not have a sliding vane. If the pressure in the enthalpy-increasing channel is less than the preset standard operating condition, the cylinder head will malfunction.

12. The method for testing the performance of a three-cylinder two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: Under stable operating conditions in the second dual-cylinder mode, the compressor stops running. The self-test circulation channel is used to connect the intake channel and the exhaust channel to form an internal circulation for testing the air tightness of the system. A backflow test is performed to obtain a fourth judgment result, which includes at least: if the backflow pressure is greater than the preset backflow pressure value, then there is air leakage in the enthalpy increase channel and / or intake channel.

13. The method for testing the performance of a three-cylinder, two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: The stable operating conditions recorded in the first dual-cylinder mode are compared with the stable operating conditions recorded in the three-cylinder mode to obtain a fifth judgment result, which includes at least: if the operating conditions are basically the same, then the control channel is blocked.

14. The method for testing the performance of a three-cylinder two-stage variable displacement compressor according to claim 7, characterized in that, The testing method also includes the following testing steps: The stable operating conditions recorded in the three-cylinder mode are compared with the stable operating conditions recorded in the second two-cylinder mode to obtain a sixth judgment result, which includes at least one of the following: if the operating conditions are basically the same, then there is a fault in the lower cylinder, the variable displacement pin, or the elastic element of the variable displacement pin.

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