A compressor oil level control system, operating condition control system and application thereof

Abstract

The application provides an oil level control system for a compressor, a working condition control system and application thereof. When the system works, a second valve controls the communication between an oil cylinder opening and the compressor, and a driving mechanism controls the oil amount in the compressor by driving the oil cylinder to suck in or discharge oil. The technical scheme of the application greatly improves the control and experimental efficiency, saves the control and experimental cost, and accelerates the project progress.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor control, in particular, to a compressor oil level control system, working condition control system and application thereof. BACKGROUND

[0002] The compressor is a complex machine running at high speed, and it is a basic requirement to maintain the normal operation of the machine to ensure full lubrication of the moving parts of the compressor such as crankshaft, bearing, connecting rod and piston. Therefore, the compressor manufacturer generally requires the use of specified grade lubricating oil and requires regular inspection of the oil level and color of the lubricating oil. Lack of oil is one of the easily identifiable compressor failures, and when the compressor is short of oil, there is little or no lubricating oil in the crankcase.

[0003] The oil level sensor can accurately and in real time monitor the high and low of the oil level in the compressor oil tank.

[0004] Currently, there are designs that apply oil level sensors to compressors to provide real-time feedback on the internal oil level of the compressor. If the oil level is low, the sensor will give real-time feedback to the system, and the system will perform oil replenishment operation on the compressor.

[0005] In the reliability test of the compressor with the oil level sensor, it is necessary to place the oil level sensor in the same changing temperature and pressure working condition inside the compressor, and detect the applicability and reliability of the sensor through the change of the oil level.

[0006] However, the installation of the oil level sensor needs to monitor the reliability and stability of the oil level sensor before mass application. Since the compressor that needs to use the oil level sensor is generally a commercial or light commercial multi-split, the compressor is generally large in size, and a large amount of oil is needed to change the oil level fluctuation. Therefore, if the oil level sensor is tested by the largest working condition of the oil level change of the compressor itself, at least ten months are needed, which greatly increases the design cycle.

[0007] If the oil level sensor is not placed inside the compressor for testing, it is difficult to simulate the same temperature and pressure changes inside the compressor, and it is also necessary to simulate the oil mist, bubbles and impurities generated by the wear inside the compressor during operation, which is quite difficult.

[0008] Therefore, the skilled in the art is committed to developing a quick and convenient compressor oil level control system, working condition control system and application thereof. SUMMARY

[0009] The compressor oil level control system of the present application can control the oil level in the compressor in real time during the operation of the compressor, greatly improves the control and experimental efficiency, saves the control and experimental cost, and speeds up the project progress.

[0010] According to one aspect of the present application, a compressor oil level control system is provided, which comprises a driving mechanism, an oil cylinder and a compressor, the driving mechanism is connected with the oil cylinder, the oil cylinder is provided with an opening, the opening of the oil cylinder is communicated with the compressor, the driving mechanism drives the oil to enter or be discharged from the oil cylinder, a second valve is arranged on the channel between the opening of the oil cylinder and the compressor, the second valve controls the opening and closing of the channel between the opening of the oil cylinder and the compressor, when the system is working, the second valve controls the channel between the opening of the oil cylinder and the compressor to be communicated, and the driving mechanism controls the oil amount in the compressor by driving the oil cylinder to suck in or discharge the oil.

[0011] Preferably, the system further comprises an oil pool, the oil pool is communicated with the opening of the oil cylinder, a first valve is arranged on the channel between the oil pool and the opening of the oil cylinder, the first valve controls the opening and closing of the channel between the oil pool and the opening of the oil cylinder, when the system is refueled, the first valve controls the channel between the oil pool and the opening of the oil cylinder to be communicated, the second valve controls the channel between the opening of the oil cylinder and the compressor to be communicated, and the oil in the oil pool is injected into the compressor; when the system is working, the first valve controls the channel between the oil pool and the opening of the oil cylinder to be disconnected, the second valve controls the channel between the opening of the oil cylinder and the compressor to be communicated, and the driving mechanism controls the oil amount in the compressor by driving the oil cylinder to suck in or discharge the oil.

[0012] Preferably, an exhaust pipeline is further arranged between the opening of the oil cylinder and the compressor, a third valve is further arranged on the exhaust pipeline, the third valve controls the opening and closing of the exhaust pipeline, when the system is exhausted, the first valve controls the channel between the opening of the oil cylinder and the oil pool to be disconnected, the second valve controls the channel between the opening of the oil cylinder and the compressor to be communicated, the third valve controls the exhaust pipeline to be communicated, and the residual gas in the system is discharged through the exhaust pipeline.

[0013] Preferably, one end of the exhaust pipeline is connected with the channel between the opening of the oil cylinder and the compressor, and the other end of the exhaust pipeline is connected with the top end of the oil pool.

[0014] Preferably, one end of the exhaust pipeline, the opening of the oil cylinder and the compressor are connected through a first three-way valve, and the first three-way valve controls the communication between each two of one end of the exhaust pipeline, the opening of the oil cylinder and the compressor.

[0015] Preferably, a vacuum mechanism is further included, which is connected with the channel between the oil cylinder and the compressor, when the system is vacuumized, the first valve controls the channel between the oil cylinder opening and the oil pool to be disconnected, the second valve controls the channel between the oil cylinder opening and the compressor to be connected, and the vacuum operation is performed on the compressor through the vacuum mechanism.

[0016] Preferably, the compressor includes a first compressor, a second compressor and a third compressor connected with each other.

[0017] According to another aspect of the present application, a working condition control system for a compressor is provided, which includes the oil level control system for a compressor and a refrigeration system according to the above, the refrigeration system being connected with the compressor, and the working condition of the compressor being controlled through the refrigeration system and the oil level control system.

[0018] According to another aspect of the present application, the oil level control system for a compressor and the working condition control system for a compressor are applied in a test of a compressor oil level sensor.

[0019] The oil level control system for a compressor of the present application can control the change of the oil surface height in the compressor and the frequency of the change in real time when the compressor is running, greatly improves the control and test efficiency, saves the control and test cost, and speeds up the project progress. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings.

[0021] Figure 1 is a structural schematic diagram of the oil level control system for a compressor of an embodiment of the present application;

[0022] Figure 2 is another structural schematic diagram of the oil level control system for a compressor of an embodiment of the present application;

[0023] Figure 3 is another structural schematic diagram of the oil level control system for a compressor of an embodiment of the present application.

[0024] REFERENCE NUMERALS

[0025] 1 driving mechanism

[0026] 11 cylinder

[0027] 12 reversing valve

[0028] 2 oil cylinder

[0029] 21 oil cylinder opening

[0030] 3 Oil tank

[0031] 4. Compressor

[0032] 41 First Compressor

[0033] 42 Second compressor

[0034] 43 Third Compressor

[0035] 5 First valve

[0036] 6 Second valve

[0037] 7. Third valve

[0038] 71 Fourth Valve

[0039] 72 Fifth Valve

[0040] 73. Sixth Valve

[0041] 74 Seventh Valve

[0042] 8 First three-way valve

[0043] 81 Second Three-Way Valve

[0044] 82 Third three-way valve

[0045] 9. Vacuum pumping mechanism

[0046] 10 Cleaning port

[0047] 100 Refrigeration System Detailed Implementation

[0048] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0049] like Figure 1 and Figure 2 As shown in the embodiments of the present invention, an oil level control system and an operating condition control system for a compressor are provided, including a drive mechanism 1, an oil cylinder 2, an oil sump 3, a compressor 4, a vacuuming mechanism 9, and a refrigeration system 100.

[0050] like Figure 1 As shown, the drive mechanism 1 is connected to the oil cylinder 2. The oil cylinder 2 has an opening 21. The drive mechanism 1 drives oil to enter the oil cylinder 2 through the opening 21 or to exit the oil cylinder 2, so as to control the oil level in the compressor 4.

[0051] The preferred drive mechanism 1 includes a cylinder 11 and a reversing valve 12. The cylinder 11 and the reversing valve 12 are connected. The cylinder 11 is provided with a connected drive rod and a piston. The piston divides the cylinder 11 into a first cylinder and a second cylinder. The first cylinder and the second cylinder are located on both sides of the piston. Entering the first cylinder can drive the piston to move towards the second cylinder, and entering the second cylinder can drive the piston to move towards the first cylinder, thereby driving the piston to move in two opposite directions.

[0052] The drive rod is connected to the air piston. When the air piston is pushed by the gas introduced into the first and second cylinders, it is driven by the air piston to move in two opposite directions.

[0053] The reversing valve 12 is equipped with two exhaust pipes, which are connected to the first cylinder and the second cylinder, respectively. An intake pipe is also connected to the reversing valve 12. After gas is introduced into the intake pipe, the reversing valve 12 can select which exhaust pipe the gas enters, allowing the gas to enter one of the two exhaust pipes, ultimately allowing the gas to enter either the first cylinder or the second cylinder, driving the piston to move in two opposite directions.

[0054] Nitrogen is the preferred gas. In cylinder 11, nitrogen gas drives the piston, which in turn moves the drive rod. Nitrogen gas in different directions can cause the drive rod to move in different directions.

[0055] Preferably, the drive rod is connected to the oil piston on the oil cylinder 2 and drives the oil piston to move. During operation, the cylinder with an opening 21 at one end of the oil piston is filled with oil. The oil piston pushes the oil in the cylinder out of the opening 21 or draws the oil into the cylinder.

[0056] like Figure 1 As shown in the embodiment of the present invention, the opening 21 of the oil cylinder 2 is connected to the oil pool 3, which stores oil, and the oil can flow from the oil pool 3 into the oil cylinder 2 through the opening 21.

[0057] Preferably, a first valve 5 is provided on the channel between the opening 21 of the hydraulic cylinder 2 and the oil tank 3. The first valve 5 controls the opening and closing of the channel between the opening 21 of the hydraulic cylinder 2 and the oil tank 3.

[0058] Preferably, the first valve 5 is a switching valve and / or a first check valve. The first check valve allows flow from the oil sump 3 to the oil cylinder 2, and prevents flow from the oil cylinder 2 to the oil sump 3. That is, oil in the oil sump 3 can flow to the oil cylinder 2, but oil or air in the oil cylinder 2 cannot flow into the oil sump 3.

[0059] For example Figure 1 As shown in the embodiment of the present invention, the opening 21 of the oil cylinder 2 is connected to the compressor 4, and the oil in the oil cylinder 2 can flow into the compressor 4.

[0060] A second valve 6 is arranged in the passage between the oil cylinder 2 opening 21 and the compressor 4. The second valve 6 controls the opening and closing of the passage between the oil cylinder 2 opening 21 and the compressor 4.

[0061] When the system is refueled, the first valve 5 controls the passage between the oil cylinder 2 opening 21 and the oil pool 3 to be connected, the second valve 6 controls the passage between the oil cylinder 2 opening 21 and the compressor 4 to be connected, and the oil in the oil pool is injected into the compressor 4; when the system is working, the first valve 5 controls the oil cylinder 2 opening 21 and the oil pool 3 to be disconnected, the second valve 6 controls the passage between the oil cylinder 2 opening 21 and the compressor 4 to be connected, and the driving mechanism 1 sucks or discharges oil through the driving oil cylinder 2 to control the oil amount in the compressor 4.

[0062] The oil level control system for the compressor in the embodiment of the present application controls the internal oil surface height change and the frequency of change in real time through the suction and discharge of the oil cylinder, greatly improves the experimental efficiency, saves the experimental cost, and speeds up the project progress.

[0063] As shown in Figure 1 In the embodiment of the present application, a pressure gauge is preferably arranged in the passage between the oil cylinder 2 opening 21 and the compressor 4 to monitor the pressure in real time.

[0064] As shown in Figure 1 In the embodiment of the present application, an exhaust pipeline is further arranged between the oil cylinder 2 opening 21 and the compressor 4, and a third valve 7 is further arranged in the exhaust pipeline.

[0065] The third valve 7 controls the opening and closing of the exhaust pipeline. When the system is exhausted, the first valve 5 controls the oil cylinder 2 opening and the oil pool 3 to be disconnected, the second valve 6 controls the oil cylinder 2 opening 21 and the compressor 4 to be connected, and the third valve 7 controls the exhaust pipeline to be connected to exhaust the gas in the compressor 4.

[0066] In the embodiment of the present application, when the system is refueled, the first valve 5 controls the oil cylinder 2 opening 21 and the oil pool 3 to be connected, the second valve 6 controls the oil cylinder 2 opening 21 and the compressor 4 to be connected, and the third valve 7 controls the exhaust pipeline to be disconnected; when the system is working, the first valve 5 controls the oil cylinder 2 opening 21 and the oil pool 3 to be disconnected, the second valve 6 controls the oil cylinder 2 opening 21 and the compressor 4 to be connected, and the third valve 7 controls the exhaust pipeline to be disconnected.

[0067] Preferably, one end of the exhaust pipeline is connected between the oil cylinder 2 opening and the compressor 4, and the other end of the exhaust pipeline is connected to the oil pool 3.

[0068] Preferably, the third valve 7 is a second one-way valve, which allows the connection from the compressor 4 to the oil pool 3 and prevents the connection from the oil pool 3 to the compressor 4.

[0069] As shown in Figure 1As shown in the figure, in the embodiment of the present application, one end of the exhaust pipe, the opening of the oil cylinder 2 and the compressor 4 are connected through the first three-way valve 8. The three-way valve controls the connection and disconnection between the two of them, that is, when the exhaust is performed, the opening of the oil cylinder 2 and the exhaust pipe are connected, or the compressor 4 and the exhaust pipe are connected, and the exhaust gas is discharged; when the system is working, the opening of the oil cylinder 2 and the compressor 4 are connected, and the exhaust pipe is disconnected.

[0070] As shown in the figure, in the embodiment of the present application, the oil level sensor 7 is arranged in the oil pool 3. Figure 2 As shown in the figure, in the embodiment of the present application, the vacuumizing mechanism 9 is further included.

[0071] The vacuumizing mechanism 9 is connected with the passage between the oil cylinder 2 and the compressor 4. When the system is vacuumized, the first valve 5 controls the disconnection of the passage between the opening of the oil cylinder 2 and the oil pool 3, and the second valve 6 controls the connection between the opening of the oil cylinder 2 and the compressor 4, so that the vacuumizing operation is performed on the compressor 4 through the vacuumizing mechanism 9.

[0072] When the vacuumizing operation of the vacuumizing mechanism 9 is completed, the system is refueled. At this time, the vacuumizing mechanism 9 is closed, the first valve 5 controls the connection of the passage between the opening of the oil cylinder 2 and the oil pool 3, and the second valve 6 controls the connection of the passage between the opening of the oil cylinder 2 and the compressor 4, and the third valve 7 controls the disconnection of the exhaust pipe. The oil in the oil pool 3 flows into the compressor 4 through the negative pressure of the vacuum, and the refueling operation is completed.

[0073] In addition, as shown in the figure, in the embodiment of the present application, the third valve 7 is arranged in the exhaust pipe. Figure 2 As shown in the figure, in the embodiment of the present application, the passage between the opening of the oil cylinder 2 and the compressor 4 is further provided with the cleaning port 10, and the oil in the system is filtered and cleaned.

[0074] In addition, as shown in the figure, in the embodiment of the present application, the compressor 4 includes the first compressor 41, the second compressor 42 and the third compressor 43 connected with each other. Figure 3 As shown in the figure, in the embodiment of the present application, the compressor 4 includes the first compressor 41, the second compressor 42 and the third compressor 43 connected with each other.

[0075] Figures 1-3 As shown in the figure, in the embodiment of the present application, the operation condition of the compressor 4 is controlled by the compressor oil level control system and the compressor working condition control system composed of the refrigeration system 100.

[0076] In addition, in the embodiment of the present application, the compressor oil level control system and / or the compressor working condition control system control the compressor 4 to test the oil level sensor of the compressor, and test the reliability of the oil level sensor.

[0077] The present application will be described below with specific embodiments: ​

[0078] Embodiment 1

[0079] As shown in the Figure 3 The system comprises a driving mechanism 1, an oil cylinder 2, an oil pool 3, a compressor 4, a vacuumizing mechanism 9 and a refrigeration system 100.

[0080] The driving mechanism 1 comprises a cylinder 11 and a reversing valve 12 connected to each other, the cylinder 11 is provided with a driving rod and a gas piston connected to each other, the driving rod is connected to an oil piston on the oil cylinder 2 and drives the oil piston to move. The oil piston in the oil cylinder 2 pushes the oil out of the opening 21 in the oil cylinder 2 or sucks the oil into the oil cylinder 2.

[0081] The opening 21 of the oil cylinder 2 is communicated with the oil pool 3, and a first valve 5 is arranged on the channel between the opening 21 of the oil cylinder 2 and the oil pool 3. The first valve 5 comprises an on-off valve and a one-way valve.

[0082] The opening 21 of the oil cylinder 2 is also communicated with the first compressor 41 and the top opening of the oil pool 3 through a first three-way valve 8.

[0083] A second valve 6 is further arranged between the opening 21 of the oil cylinder 2 and the first three-way valve 8.

[0084] The second compressor 42 and the third compressor 43 are connected in the same way as the first compressor 41, that is, the second compressor 42 is communicated with the oil cylinder 2 and the top opening of the oil pool 3 through a second three-way valve 81. The third compressor 43 is communicated with the oil cylinder 2 and the top opening of the oil pool 3 through a third three-way valve 82.

[0085] The channels of the first compressor 41, the second compressor 42 and the third compressor 43 to the top opening of the oil pool 3 are respectively provided with a third valve 7, a fourth valve 71 and a fifth valve 72.

[0086] The vacuumizing mechanism 9 is connected to and communicated with the channels between the second valve 6 and the first three-way valve 8, the second three-way valve 81 and the third three-way valve 82, and a sixth valve 73 is arranged on the outlet channel of the vacuumizing mechanism 9.

[0087] A cleaning port 10 is further arranged on the channels between the second valve 6 and the first three-way valve 8, the second three-way valve 81 and the third three-way valve 82, and a seventh valve 74 is arranged on the outlet channel of the cleaning port 10.

[0088] As shown in the Figure 3 When the system works, the following steps are taken:

[0089] (1) Vacuumizing: Close the first valve 5, the third valve 7, the fourth valve 71, the fifth valve 72 and the seventh valve 74, open the second valve 6 and the sixth valve 73, and use a vacuum pump to perform vacuumizing operation on the entire system.

[0090] (2) System oiling: close the third valve 7, the fourth valve 71, the fifth valve 72, the sixth valve 73, the seventh valve 74, open the first valve 5, the second valve 6. After the system is stopped, the low pressure in the compressor (41, 42, 43) cavity is used to suck the oil in the oil pool 3. The specific oil control can be observed by the sight glass on the compressor (41, 42, 43) to control the oil level inside the compressor (41, 42, 43) manually; or by the pipe diameter and the oiling time, the oil amount inside the compressor (41, 42, 43) is controlled.

[0091] (3) System exhaust: close the first valve 5, the sixth valve 73, the seventh valve 74, open the second valve 6, the third valve 7, the fourth valve 71, the fifth valve 72, further exhaust the residual gas in the system.

[0092] (4) Actual working state: close the first valve 5, the third valve 7, the fourth valve 71, the fifth valve 72, the sixth valve 73, the seventh valve 74, open the second valve 6, the system formally starts working. At this time, the compressor (41, 42, 43) suction and exhaust pipe is connected to one side of the system table control working condition, the compressor (41, 42, 43) normal operation; at the same time, through the reversing valve 12 switching cylinder 11 back pressure, when the reversing valve 12 switches to (for example: helium) high pressure side, the system cylinder 11 back pressure is higher than the exhaust high pressure in the compressor (41, 42, 43) cavity, the cylinder 11 pushes the oil in the oil cylinder 2, and the oil is pressed into the compressor (41, 42, 43) inside, realizing the purpose of oil level rising; when the reversing valve 12 switches to the low pressure side, the cylinder 11 back pressure is lower than the exhaust high pressure in the compressor (41, 42, 43) cavity, the oil in the compressor (41, 42, 43) is sucked back into the oil cylinder, realizing the purpose of reducing the oil level inside the compressor (41, 42, 43). The stroke of the oil level fluctuation in the compressor (41, 42, 43) can be calculated and controlled by the pipe diameter and time, or can be manually controlled by the sight glass observation.

[0093] If the oil level fluctuation inside the compressor is achieved by adjusting the working condition, the sensor action cycle is about 15 minutes. Since the air conditioning industry generally assesses the life cycle of 10 years, the long-term life experiment of the sensor needs at least ten months. The control and test system of the embodiment of the present application controls the compressor to run in the worst working condition for the oil level sensor action by controlling the oil level control system of the compressor test bench and the refrigeration system 100. At the same time, through the reversing valve, the back pressure of the cylinder is controlled. When the reversing valve switches to external pressurization, the cylinder back pressure is higher than the exhaust pressure inside the compressor, and the cylinder will pour the oil in the oil cylinder into the compressor to change the oil level position inside the compressor. When the reversing valve switches to external pressure relief, the cylinder back pressure is lower than the internal pressure of the compressor, and the oil in the compressor returns to the inside of the oil cylinder. And through the action frequency and action stroke of the cylinder, the position of the oil level fluctuation inside the compressor is controlled, and the range of the oil level fluctuation is controlled to be just in the range of the oil level sensor action. One action cycle can be shortened to be completed within 1 minute, and the whole life experiment time can be controlled to be completed in 1 week, which greatly improves the experimental efficiency, saves the experimental cost, and speeds up the project progress.

[0094] In summary, the compressor oil level control system, working condition system and application thereof of the embodiment of the present application simultaneously control the frequency of oil level change and the real-time control of the oil level height change and the change frequency inside the compressor during the operation of the compressor, which greatly improves the control and experimental efficiency, saves the control and experimental cost, and speeds up the project progress.

[0095] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. An oil level control system for a compressor, characterized by, The system comprises a driving mechanism (1), an oil cylinder (2) and a compressor (4), the driving mechanism (1) is connected with the oil cylinder (2), the oil cylinder (2) is provided with an opening (21), the opening (21) of the oil cylinder (2) is communicated with the compressor (4), the driving mechanism (1) drives oil to enter or discharge from the oil cylinder (2) through the opening (21), a second valve (6) is arranged on the channel between the opening (21) of the oil cylinder (2) and the compressor (4), the second valve (6) controls the opening and closing of the channel between the opening (21) of the oil cylinder (2) and the compressor (4), when the system works, the second valve (6) controls the channel between the opening (21) of the oil cylinder (2) and the compressor (4) to be communicated, the driving mechanism (1) controls the oil amount in the compressor (4) by driving the oil cylinder (2) to suck or discharge oil. The system further comprises an oil pool (3), the oil pool (3) is communicated with the opening (21) of the oil cylinder (2), a first valve (5) is arranged on the channel between the oil pool (3) and the opening (21) of the oil cylinder (2), the first valve (5) controls the opening and closing of the channel between the oil pool (3) and the opening (21) of the oil cylinder (2), when the system is refueled, the first valve (5) controls the channel between the oil pool (3) and the opening (21) of the oil cylinder (2) to be communicated, the second valve (6) controls the channel between the opening (21) of the oil cylinder (2) and the compressor (4) to be communicated, and the oil in the oil pool (3) is injected into the compressor (4); when the system works, the first valve (5) controls the channel between the oil pool (3) and the opening (21) of the oil cylinder (2) to be disconnected, the second valve (6) controls the channel between the opening (21) of the oil cylinder (2) and the compressor (4) to be communicated, and the driving mechanism (1) controls the oil amount in the compressor (4) by driving the oil cylinder (2) to suck or discharge oil. An exhaust pipeline is further arranged between the opening (21) of the oil cylinder (2) and the compressor (4), a third valve (7) is further arranged on the exhaust pipeline, the third valve (7) controls the opening and closing of the exhaust pipeline, when the system is exhausted, the first valve (5) controls the channel between the opening (21) of the oil cylinder (2) and the oil pool (3) to be disconnected, the second valve (6) controls the channel between the opening (21) of the oil cylinder (2) and the compressor (4) to be communicated, the third valve (7) controls the exhaust pipeline to be communicated, and the residual gas in the system is discharged through the exhaust pipeline.

2. The oil level control system for a compressor of claim 1, wherein: One end of the exhaust pipeline is connected with the channel between the opening (21) of the oil cylinder (2) and the compressor (4), and the other end of the exhaust pipeline is connected with the top end of the oil pool (3).

3. The oil level control system for a compressor of claim 2, wherein: One end of the exhaust pipeline, the opening (21) of the oil cylinder (2) and the compressor (4) are connected through a first three-way valve (8), the first three-way valve (8) controls the communication between each two of one end of the exhaust pipeline, the opening (21) of the oil cylinder (2) and the compressor (4).

4. The oil level control system for a compressor of claim 1, wherein: Also included is a vacuum pumping mechanism (9) connected to the passage between the oil cylinder (2) and the compressor (4), when the system is pumped, the first valve (5) controls the passage between the oil cylinder (2) opening (21) and the oil pool (3) to be disconnected, the second valve (6) controls the passage between the oil cylinder (2) opening (21) and the compressor (4) to be connected, and the compressor (4) is pumped by the vacuum pumping mechanism (9).

5. The oil level control system for a compressor of claim 1, wherein: The compressor (4) includes a first compressor (41), a second compressor (42) and a third compressor (43) connected.

6. An operating condition control system for a compressor, characterized by: A refrigeration system (100) connected to the compressor (4) is included, and the working condition of the compressor (4) is controlled by the refrigeration system (100) and the oil level control system.

7. The use of the oil level control system for the compressor according to any one of claims 1-5 in the test of the compressor oil level sensor.

8. The use of the working condition control system for the compressor according to claim 6 in the test of the compressor oil level sensor.

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