A method for repairing a compressor in a refrigeration system

Abstract

The present invention provides a method for repairing a compressor in a refrigeration system, and belongs to the technical field of compressor repair. It includes: stopping the operation of the refrigeration system, closing the ammonia input pipeline and the ammonia output pipeline of the compressor unit of the refrigeration system; connecting the oil collector and the oil separator of the compressor unit, connecting the oil collector and the low-pressure circulation barrel of the refrigeration system; opening the oil collector inlet valve between the oil collector and the oil separator, opening the oil collector pressure reducing valve between the oil collector and the low-pressure circulation barrel, discharging the lubricating oil and ammonia in the compressor unit to the oil collector, or discharging the ammonia in the compressor unit to the oil collector, and the ammonia in the oil collector flows to the low-pressure circulation barrel; when the ammonia and lubricating oil in the compressor unit are discharged to a preset amount or the ammonia is discharged to a preset amount, the pressure relief is completed, and the oil collector inlet valve is closed; the compressor unit is repaired. The present application discharges the lubricating oil and ammonia into the oil collector, quickly completes the pressure relief, improves the pressure relief efficiency, and saves maintenance time.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor maintenance, and in particular relates to a compressor maintenance method in a refrigeration system. Background Art

[0002] The refrigeration system of the icing wind tunnel is crucial to the simulation of the thermal flow field of the icing wind tunnel. The refrigeration system is mainly composed of a compressor, a heat exchanger, a condenser, an ammonia pump, an ammonia storage tank and a low-pressure circulation barrel. Ammonia liquid (R717) is used as the refrigerant, and the ammonia liquid is pressurized by the ammonia pump from the low-pressure circulation barrel and transported to the heat exchanger.

[0003] Refrigeration plants are generally equipped with multiple compressors to achieve primary regulation of temperature field control. This year, the frequency of maintenance and repair work in refrigeration plants has gradually increased. Before carrying out maintenance work, the compressor needs to be depressurized. The existing pressure relief method is generally to directly guide the lubricating oil and ammonia in the compressor unit through a tank truck and then hand it over to a special recycling agency for treatment. However, this method is time-consuming and costly, and it is very easy to waste lubricating oil and ammonia, and it is also easy to pollute the environment. Summary of the invention

[0004] The purpose of this application is to provide a compressor maintenance method in a refrigeration system to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] An embodiment of the present application provides a method for repairing a compressor in a refrigeration system, comprising: stopping the operation of the refrigeration system, closing the ammonia input pipeline and the ammonia output pipeline of the compressor unit of the refrigeration system; connecting the oil collector and the oil separator of the compressor unit, and connecting the oil collector and the low-pressure circulation barrel of the refrigeration system; opening the oil collector oil inlet valve between the oil collector and the oil separator, opening the oil collector pressure reducing valve between the oil collector and the low-pressure circulation barrel, discharging the lubricating oil and ammonia in the compressor unit to the oil collector, or discharging the ammonia in the compressor unit to the oil collector, and the ammonia in the oil collector flows to the low-pressure circulation barrel; when the ammonia and lubricating oil in the compressor unit are discharged to a preset amount or the ammonia is discharged to a preset amount, the pressure relief is completed, and the oil collector oil inlet valve is closed; and the compressor unit is repaired.

[0007] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0008] In the present application, by connecting the oil collector with the oil separator, the oil collector is used to export the ammonia in the compressor unit to the low-pressure circulation barrel, so as to quickly complete the pressure relief process, improve the pressure relief efficiency, save the maintenance time of the compressor, and at the same time, avoid the waste of ammonia, improve the utilization rate of ammonia, and reduce costs; in addition, it is also possible to choose whether to export the lubricating oil according to actual conditions. After the lubricating oil is exported, it is directly stored in the oil collector, which is convenient for subsequent processing, avoids the waste of lubricating oil, and avoids ammonia and lubricating oil from polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is a schematic diagram of the overall structure of a refrigeration system provided in some embodiments of the present application;

[0011] Figure 2 It is a connection diagram of a compressor, an oil separator and an oil collector provided in some embodiments of the present application.

[0012] In the figure: 100-compressor unit, 110-compressor, 120-oil separator, 121-oil separator vent valve, 122-external discharge pipe, 130-first pipe, 131-stop valve, 200-evaporator, 300-ammonia pump, 400-low-pressure circulation barrel, 500-liquid storage tank, 600-condenser, 700-oil collector, 710-oil collector oil inlet valve, 720-oil collector oil discharge valve, 730-oil collector pressure reducing valve. DETAILED DESCRIPTION

[0013] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0014] The present application embodiment provides a method for repairing a compressor in a refrigeration system, and the specific repair steps include:

[0015] Stop the refrigeration system and close the ammonia input pipeline and ammonia output pipeline of the compressor unit 100 of the refrigeration system. Before maintenance, the refrigeration system needs to be shut down first, and maintenance can only be carried out when the refrigeration system is not running. At the same time, in order to export the ammonia of the compressor unit 100, the ammonia input port and output port of the compressor unit 100 need to be closed.

[0016] In a conventional refrigeration system, the input pipeline of the compressor unit 100 generally includes an air intake pipeline and an air supply pipeline, the air intake pipeline is provided with an air intake valve, the air supply pipeline is provided with an air supply valve, and the output pipeline of the compressor unit 100 is generally an exhaust pipeline, and the exhaust pipeline is provided with an exhaust valve. After the refrigeration system is shut down, the air intake valve, the air supply valve and the exhaust valve are closed.

[0017] The structure of the conventional refrigeration system can refer to Figure 1 As shown, the refrigeration system includes a compressor unit 100, an evaporator 200, an ammonia pump 300, a low-pressure circulation barrel 400, a liquid storage tank 500 and a condenser 600; the compressor unit 100 includes a compressor 110, an oil separator 120, an economizer and an oil pump. The ammonia pump 300 delivers the liquid ammonia in the low-pressure circulation barrel 400 to the evaporator 200. The liquid ammonia evaporates in the evaporator 200 and absorbs heat to be converted into ammonia gas. The ammonia gas flows to the low-pressure circulation barrel 400. Part of the ammonia gas is supplied to the intake pipe of the compressor unit 100, and the other part is stored in the low-pressure circulation barrel 400. The compressor 110 of the compressor unit 100 compresses the ammonia gas and discharges it to the oil separator 120. The oil separator 120 discharges the ammonia gas to the condenser 600. The ammonia gas is converted into ammonia liquid through the condenser 600 and then returns to the liquid reservoir 500. When the ammonia liquid in the low-pressure circulation barrel 400 is insufficient, the liquid reservoir 500 replenishes ammonia to the low-pressure circulation barrel 400.

[0018] Prepare the oil collector 700, connect the oil collector 700 and the oil separator 120 of the compressor unit 100, and connect the oil collector 700 and the low-pressure circulation barrel 400 of the refrigeration system. The oil collector 700 is a device independent of the refrigeration system, and the oil collector 700 does not participate in the operation of the refrigeration system. In addition, the oil collector 700 will only be connected to the refrigeration system when the refrigeration system stops running and the compressor unit 100 needs to be depressurized for maintenance.

[0019] The oil collector 700 has an oil input port and an oil output port. The oil input port is provided with an oil collector oil inlet valve 710, and the oil output port is provided with an oil collector oil discharge valve 720. The oil input port of the oil collector 700 is connected to the oil separator 120. When the oil collector 700 does not discharge oil to the outside, the oil collector oil discharge valve 720 is closed. The oil collector 700 also has a gas outlet, which is connected to the low-pressure circulation barrel 400. The gas outlet is provided with an oil collector pressure reducing valve 730.

[0020] The oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 is opened, and the oil collector pressure reducing valve 730 between the oil collector 700 and the low-pressure circulation barrel 400 is opened. The oil collector 700 is connected to the oil separator 120, and the oil separator 120 is a part of the compressor unit 100. The lubricating oil and ammonia of the compressor unit 100 are discharged into the oil collector 700 through the oil separator 120, or the ammonia in the compressor unit 100 is discharged into the oil collector 700 through the oil separator 120. The ammonia entering the oil collector 700 flows into the low-pressure circulation barrel 400.

[0021] By opening and closing the valve in the compressor unit 100, it is possible to control whether the lubricating oil in the compressor 110 is discharged into the oil collector 700. Ammonia enters the oil collector 700 and then flows to the low-pressure circulation barrel 400, which can quickly relieve the pressure of the compressor unit 100 and reuse the ammonia. The normal pressure in the low-pressure circulation barrel 400 is always lower than 5 bar. After the low-pressure circulation barrel 400 is connected to the oil separator 120 through the oil collector 700, the end of the oil collector 700 is always in a low-pressure state. Therefore, the lubricating oil and ammonia in the compressor unit 100 will flow into the oil collector 700.

[0022] In the compressor unit 100, there are generally multiple compressors 110. In some embodiments, the pressure in the low-pressure circulation barrel 400 can be regulated by controlling any other compressor 110 that is not discharging oil or ammonia, thereby further reducing the pressure of the low-pressure circulation barrel 400.

[0023] When the ammonia and lubricating oil in the compressor unit 100 are discharged to a preset amount, or when the ammonia in the compressor unit 100 is discharged to a preset amount, the pressure relief is completed, and the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 can be closed. When the operator relieves the pressure of the compressor unit 100, it is not necessary to discharge all the lubricating oil and ammonia, but to discharge an appropriate amount of lubricating oil and ammonia according to the actual situation. When the lubricating oil and ammonia in the compressor unit 100 are discharged in appropriate amounts, and the remaining lubricating oil and ammonia in the compressor unit 100 are within the preset range, the pressure relief work can be completed.

[0024] After the pressure relief is completed, the compressor unit 100 can be repaired. For example, the compressor 110 may be repaired by replacing the shaft seal or repairing the yin and yang rotors.

[0025] In the embodiment provided by the present application, an additional oil collector 700 is prepared and connected to the refrigeration system to collect the lubricating oil and ammonia discharged from the compressor unit 100, so as to avoid the lubricating oil and ammonia from polluting the environment; the lubricating oil can be directly stored in the oil collector 700 after being exported, which is convenient for subsequent processing and avoids the waste of lubricating oil. Ammonia is directly introduced into the low-pressure circulation barrel 400 of the refrigeration system to avoid the waste of ammonia, improve the utilization rate of ammonia, and avoid the situation of directly exporting lubricating oil and ammonia to pollute the environment. In addition, ammonia is directly exported from the compressor unit 100 to the oil collector 700, and the pressure relief inside the compressor unit 100 is quickly completed, the pressure relief efficiency is improved, and the maintenance time of the compressor 110 is saved.

[0026] The maintenance method provided in the embodiment of the present application can be used for maintenance of the screw compressor 110 .

[0027] In the refrigeration system applicable to the maintenance method provided in the embodiment of the present application, the valve in the compressor unit 100 can be controlled to control whether the lubricating oil in the compressor 110 flows into the oil collector 700 .

[0028] The exhaust port of the compressor 110 is connected to the air inlet of the oil separator 120. Ammonia flows from the compressor 110 through the exhaust port of the compressor 110 and then through the air inlet of the oil separator 120 into the oil separator 120, and then flows into the oil collector 700. A first pipeline 130 is also connected between the oil separator 120 and the compressor 110. A stop valve 131 is provided on the first pipeline 130. When the stop valve 131 is opened, the lubricating oil in the compressor 110 flows into the oil collector 700 through the first pipeline 130.

[0029] When it is chosen to discharge the lubricating oil and ammonia in the compressor unit 100 into the oil collector 700 together, the specific operation steps include: opening the stop valve 131, discharging the lubricating oil in the compressor 110 into the oil collector 700, and at the same time, discharging the ammonia in the compressor 110 into the oil collector 700 through the oil separator 120.

[0030] The first pipe 130 is generally not directly connected to the inside of the oil separator 120. Figure 2 As shown, the oil separator 120 has an external discharge pipe 122, and an oil separator drain valve 121 is provided on the external discharge pipe 122. The oil collector 700 is connected to the oil separator drain valve 121, and the oil separator 120 discharges ammonia and lubricating oil through the external discharge pipe 122. The first pipe 130 is connected to the external discharge pipe 122, and the lubricating oil discharged from the compressor 110 can flow directly to the oil collector 700 without passing through the inside of the oil separator 120, but flows to the oil collector 700 through the external discharge pipe 122 of the oil separator 120, thereby reducing the flow path of the lubricating oil and discharging it faster.

[0031] The height of the exhaust port of the compressor 110 is generally higher than the connection port between the first pipe 130 and the compressor 110, and is also higher than the height of the lubricating oil in the compressor 110. The lubricating oil is generally in liquid state, and ammonia is generally in gaseous state. Therefore, ammonia is generally discharged only through the exhaust port, and whether the stop valve 131 is closed or not will not affect the normal discharge of the lubricating oil.

[0032] In some refrigeration systems, the first pipe 130 can be connected to the air supply pipe of the compressor 110, and the stop valve 131 is actually the stop valve 131 on the air supply pipe, and the stop valve 131 simultaneously controls the connection between the air supply pipe and the first pipe 130. However, since the air supply valve of the air supply pipe is in a closed state during the process of pressure relief and oil discharge, after the stop valve 131 is opened, since the compressor 110 is at a high pressure inside and the oil collector 700 is at a low pressure inside, under the action of pressure, after the lubricating oil in the compressor 110 enters the air supply pipe, since the air supply valve is in a closed state, the lubricating oil will enter the first pipe 130 and then flow into the oil collector 700.

[0033] In the maintenance method provided in the embodiment of the present application, when the ammonia and lubricating oil in the compressor unit 100 are discharged to a preset amount, the method includes:

[0034] It is determined whether the height h of the lubricating oil in the oil collector 700 reaches 70% of the total height H inside the oil collector 700, and whether the internal pressure P of the compressor unit 100 is greater than zero. A liquid level gauge is installed at the oil collector 700 to detect the height h of the lubricating oil.

[0035] If h is greater than 70%H, it means that there is too much lubricating oil, and the lubricating oil in the oil collector 700 needs to be discharged in time, otherwise the lubricating oil will flow to the low-pressure circulation barrel 400, which will seriously affect the subsequent use of the refrigeration system. The pressure inside the compressor unit 100 is determined by ammonia. If P=0Pa, it means that the ammonia in the compressor unit 100 has been exhausted. If P>0Pa, it means that the ammonia has not been exhausted.

[0036] If h≤70%H, and P=0Pa, it means that the pressure relief is completed, and the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 can be closed to repair the compressor 110.

[0037] If h=70%H, and P>0Pa, it means that the amount of lubricating oil in the oil collector 700 has reached the upper limit, but the ammonia has not been completely discharged. Therefore, it is necessary to suspend the pressure relief process and process the lubricating oil in the oil collector 700. Specifically, close the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 to prevent the inflow of ammonia and lubricating oil, and then connect the oil collector 700 and the oil storage device, which is used to receive the excess lubricating oil in the oil collector 700. Open the oil collector drain valve 720 between the oil collector 700 and the oil storage device to discharge the lubricating oil in the oil collector 700 into the oil storage device. When the discharge amount of the lubricating oil reaches the preset amount, close the oil collector drain valve 720, open the oil collector inlet valve 710, and discharge the lubricating oil and ammonia in the compressor unit 100 into the oil collector 700 again until P=0Pa. Then close the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 to repair the compressor 110.

[0038] In some preferred embodiments, at P=0Pa, before closing the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120, the process further includes:

[0039] Observe the preset time period If P is always zero, close the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120, and repair the compressor unit 100. If P is not equal to zero, observe the preset time period again. The value of P within the preset time period P is always zero.

[0040] When P=0Pa, it is necessary to observe whether P will rise again within a period of time. If P does not rise again, it can be determined that the pressure relief is complete, and the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 can be closed to repair the compressor 110. Preset time period Set according to actual situation.

[0041] In some further preferred embodiments, if all the ammonia and lubricating oil that can be discharged from the compressor unit 100 are to be discharged into the oil collector 700, then P is always zero. Before closing the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120, it is also necessary to determine whether the height h of the lubricating oil in the oil collector 700 is within a preset time period. Internal changes.

[0042] When the lubricating oil height h is within the preset time period If it remains unchanged, it means that all the lubricating oil that can be discharged from the compressor unit 100 has been discharged. At this time, the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 can be closed to repair the compressor 110. However, due to the different densities of lubricating oil and ammonia, during the pressure relief process, the lubricating oil is usually discharged before ammonia. Therefore, before P drops to 0, you can pay attention to the height of the liquid level gauge in advance to determine whether the lubricating oil has been discharged, saving operation time.

[0043] In addition, according to different maintenance requirements, the stop valve 131 can be closed in advance during the pressure relief process to control the discharge amount of the lubricating oil in the compressor 110.

[0044] In some maintenance methods, the stop valve 131 may be closed to discharge only the ammonia in the oil separator 120. Specifically, the oil collector 700 and the oil separator 120 are connected, the stop valve 131 is closed, and the ammonia in the oil separator 120 is discharged to the oil collector 700. In theory, this pressure relief method only discharges the ammonia in the oil separator 120.

[0045] When the ammonia in the compressor unit 100 is discharged to a preset amount, the process includes: determining whether the internal pressure P of the compressor unit 100 is greater than zero; if P=0Pa, the pressure relief is completed, and closing the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 .

[0046] The case of discharging only ammonia is similar to the case of discharging lubricating oil and ammonia at the same time. Both require the detection of the internal pressure P of the compressor unit 100. When P is zero, the pressure relief is completed. At the same time, before closing the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120 at P=0Pa, it also includes: observing whether P will rise again. Specific operation: Observe the preset time period If P is always zero, close the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120, and repair the compressor unit 100. If P is not equal to zero, observe the preset time period again. The value of P within the preset time period P is always zero.

[0047] In addition, although during the pressure relief process, the lubricating oil in the compressor 110 flows directly to the external discharge pipe 122 of the oil separator 120 and does not enter the oil separator 120, during the operation of the refrigeration system, some lubricating oil will remain in the oil separator 120. Therefore, even during the pressure relief process, when the stop valve 131 is closed and only ammonia is discharged, at least some of the lubricating oil in the oil separator 120 can be discharged into the oil collector 700.

[0048] When the ammonia and lubricating oil in the compressor unit 100 are discharged to a preset amount, after closing the oil collector inlet valve 710 between the oil collector 700 and the oil separator 120, the related operation of exporting the lubricating oil in the oil collector 700 to the oil storage device for storage is also included.

[0049] In some embodiments, the oil storage device can directly select a container with a storage function.

[0050] In other embodiments, the oil storage device may be an external compressor unit 100. The oil collector 700 and the external compressor unit 100 are connected, and the oil collector drain valve 720 between the oil collector 700 and the external compressor unit 100 is opened to discharge the lubricating oil in the oil collector 700 into the external compressor unit 100.

[0051] In the case where the external compressor unit 100 lacks lubricating oil, it can be directly connected to the oil collector 700 to deliver the lubricating oil in the oil collector 700 to the external compressor unit 100. In the case where the lubricating oil in the external compressor unit 100 is greater than the standard value, that is, after the amount of lubricating oil in the external compressor unit 100 reaches the upper limit, the oil pump to the external compressor unit 100 is stopped. At this time, the oil collector 700 and the oil pump of the compressor unit 100 can be connected, the lubricating oil in the oil collector 700 can be discharged into the oil pump, and the oil pump can be turned on to recover the lubricating oil.

[0052] In the maintenance method provided in the embodiment of the present application, the connection between the oil collector 700 and the oil separator 120, the connection between the oil collector 700 and the external compressor unit 100, or the connection of the oil storage device are all connected using metal hoses that are resistant to high pressure and low temperature corrosion. They are flexible to use and ensure the stability of the material during the transportation process.

[0053] During the process of discharging the lubricating oil and ammonia in the compressor unit 100 into the oil collector 700, or during the process of discharging the ammonia in the compressor unit 100 into the oil collector 700, the oil collector 700 is heated so that the internal temperature of the oil collector 700 is maintained between 50 degrees Celsius and 80 degrees Celsius, and the ammonia liquid in the oil collector 700 is heated to be converted into ammonia gas, and all the ammonia is transported to the low-pressure circulation barrel 400 as much as possible to reduce the waste of ammonia.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for repairing a compressor in a refrigeration system, characterized in that: include: Stopping the operation of the refrigeration system, and closing the ammonia input pipeline and the ammonia output pipeline of the compressor unit (100) of the refrigeration system; An oil collector (700) is connected to the oil separator (120) of the compressor unit (100), and the oil collector (700) is connected to the low-pressure circulation barrel (400) of the refrigeration system; Opening the oil collector inlet valve (710) between the oil collector (700) and the oil separator (120), opening the oil collector pressure reducing valve (730) between the oil collector (700) and the low-pressure circulation barrel (400), discharging the lubricating oil and ammonia in the compressor unit (100) into the oil collector (700), or discharging the ammonia in the compressor unit (100) into the oil collector (700), and allowing the ammonia gas in the oil collector (700) to flow into the low-pressure circulation barrel (400); When the ammonia and lubricating oil in the compressor unit (100) are discharged to a preset amount or the ammonia is discharged to a preset amount, the pressure relief is completed and the oil collector oil inlet valve (710) is closed; Repairing the compressor unit (100); When the ammonia and lubricating oil in the compressor unit (100) are discharged to a preset amount, the method comprises: Determining whether the height h of the lubricating oil in the oil collector (700) reaches 70% of the total height H inside the oil collector (700), and determining whether the internal pressure P of the compressor unit (100) is greater than zero; If h≤70%H, and P=0Pa, the pressure relief is completed, and the oil inlet valve (710) of the oil collector is closed; If h=70%H, and P>0Pa, the oil collector inlet valve (710) is closed, the oil collector (700) and the oil storage device are connected, the oil collector drain valve (720) between the oil collector (700) and the oil storage device is opened, and the lubricating oil in the oil collector (700) is discharged into the oil storage device; when the discharge amount of the lubricating oil reaches a preset amount, the oil collector drain valve (720) is closed, the oil collector inlet valve (710) is opened, and the lubricating oil and ammonia in the compressor unit (100) are discharged into the oil collector (700) again until P=0Pa; When the ammonia emission in the compressor unit (100) reaches a preset amount, the method comprises: It is determined whether the internal pressure P of the compressor unit (100) is greater than zero; if P=0 Pa, the pressure relief is completed and the oil collector oil inlet valve (710) is closed.

2. A method for repairing a compressor in a refrigeration system according to claim 1, characterized in that: The step of discharging the lubricating oil and ammonia in the compressor unit (100) to the oil collector (700) comprises: The air inlet of the oil separator (120) is connected to the exhaust port of the compressor (110) of the compressor unit (100), so that the ammonia in the compressor (110) is discharged to the oil separator (120); A first pipe (130) equipped with a stop valve (131) is also connected between the oil separator (120) and the compressor (110); the oil separator (120) has an external discharge pipe (122) connected to the oil collector (700); the first pipe (130) is connected to the external discharge pipe (122); when the stop valve (131) is opened, the lubricating oil in the compressor (110) is discharged to the oil collector (700) through the external discharge pipe (122); The ammonia in the oil separator (120) is discharged to the oil collector (700).

3. A method for repairing a compressor in a refrigeration system according to claim 2, characterized in that: When the lubricating oil and ammonia in the compressor unit (100) are discharged to the oil collector (700), before closing the oil inlet valve (710) of the oil collector at P=0Pa, the method further includes: Observe the preset time period If P is always zero, the oil collector inlet valve (710) is closed and the compressor unit (100) is repaired. If P is not equal to zero, the preset time period is observed again. The value of P within the preset time period P is always zero.

4. A method for repairing a compressor in a refrigeration system according to claim 3, characterized in that: During the preset time period During the period, P is always zero, and before closing the oil inlet valve (710) of the oil collector, it is determined that the height h of the lubricating oil in the oil collector (700) is within a preset time period. Internal changes; When the lubricating oil height h is within the preset time period While maintaining the state unchanged, close the oil collector oil inlet valve (710).

5. A method for repairing a compressor in a refrigeration system according to claim 1, characterized in that: The step of discharging ammonia in the compressor unit (100) to the oil collector (700) comprises: The air inlet of the oil separator (120) is connected to the exhaust port of the compressor (110) of the compressor unit (100), so that the ammonia in the compressor (110) is discharged to the oil separator (120); A first pipeline (130) equipped with a stop valve (131) is also connected between the oil separator (120) and the compressor (110), and the stop valve (131) is closed; The ammonia in the oil separator (120) is discharged to the oil collector (700).

6. A method for repairing a compressor in a refrigeration system according to claim 5, characterized in that: When the ammonia in the compressor unit (100) is discharged to the oil collector (700), before the P=0Pa and the oil inlet valve (710) of the oil collector is closed, the method further includes: Observe the preset time period If P is always zero, the oil collector inlet valve (710) is closed and the compressor unit (100) is repaired. If P is not equal to zero, the preset time period is observed again. The value of P within the preset time period P is always zero.

7. A method for repairing a compressor in a refrigeration system according to claim 1, characterized in that: When the ammonia and lubricating oil in the compressor unit (100) are discharged to a preset amount, after closing the oil collector oil inlet valve (710), the method further comprises: connecting the oil collector (700) and the external compressor unit (100), opening the oil collector drain valve (720) between the oil collector (700) and the external compressor unit (100), and draining the lubricating oil in the oil collector (700) into the external compressor unit (100); When the lubricating oil in the external compressor unit (100) is greater than a standard value, the oil collector (700) and the oil pump of the compressor unit (100) are connected to discharge the lubricating oil in the oil collector (700) into the oil pump.

8. A method for repairing a compressor in a refrigeration system according to claim 1, characterized in that: During the process of discharging the lubricating oil and ammonia in the compressor unit (100) into the oil collector (700), or during the process of discharging the ammonia in the compressor unit (100) into the oil collector (700), the oil collector (700) is heated, and the internal temperature of the oil collector (700) is maintained between 50 degrees Celsius and 80 degrees Celsius, so that the ammonia liquid in the oil collector (700) is heated and converted into ammonia gas.

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