Lubricating oil way system of compressor

Abstract

The invention discloses a compressor lubricating oil way system, which belongs to the technical field of compressor lubrication, and comprises a lubricating oil tank, an oil transportation assembly, a cooling assembly and a filtering assembly, the cooling assembly comprises a first cooler and a second cooler, and the filtering assembly comprises a first filter and a second filter; a first branch is arranged between inlets of the first cooler and the second cooler, second outlets of the first cooler and the second cooler are connected to a first backflow branch, and the first backflow branch is communicated to a lubricating oil tank; a second branch is arranged between the inlets of the first filter and the second filter, the second outlets of the first filter and the second filter are connected to a second backflow branch, and the second backflow branch is communicated to the lubricating oil tank. It is guaranteed that standby equipment is still filled with lubricating oil in a standby state, it is guaranteed that the lubricating oil in the standby equipment is in a circular flowing state in the normal working process, and the problems of oil pressure fluctuation and oil temperature fluctuation existing in equipment switching are solved.

Description

Technical Field

[0001] This invention belongs to the field of compressor lubrication technology, and specifically relates to a compressor lubrication oil circuit system. Background Technology

[0002] The lubrication system of a centrifugal compressor is a crucial auxiliary system that provides lubrication, cooling, and sealing for moving parts such as the compressor's rotor bearings and speed-increasing gears, directly affecting the equipment's service life and stability. In the oil circuit system of a centrifugal compressor, the oil passing through the oil pump needs to be cooled and filtered before being returned to the oil tank. During operation, the cooler and filter are usually kept on standby to ensure that the compressor can be maintained and replaced without shutting it down.

[0003] However, the following problems exist in the entire oil circuit system during the process of switching to standby equipment for the cooler or filter: (1) Since the backup equipment and its connecting pipelines are not filled with oil, switching equipment during the operation of the compressor will cause fluctuations in system oil pressure and oil temperature. These fluctuations will affect the operating stability of components such as rotor bearings, and ultimately affect the stability of the compressor. (2) Since the standby equipment and its connecting pipelines are not filled with oil, there may be impurities in the standby equipment and its connecting pipelines. When switching the standby equipment, these impurities will mix into the lubricating oil entering the compressor, affecting the cleanliness of the lubricating oil and thus affecting the stable operation of the compressor. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compressor lubrication system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A compressor lubrication system includes a lubrication tank, an oil delivery assembly, a cooling assembly, and a filtering assembly, wherein an oil filter is provided at the oil outlet of the lubrication tank. The cooling assembly includes a first cooler and a second cooler connected in parallel as backups for each other, and the filtration assembly includes a first filter and a second filter connected in parallel as backups for each other; The oil outlet of the lubricating oil tank is connected to the inlet of the oil delivery assembly, the outlet of the oil delivery assembly is connected to the inlet of the first cooler and the second cooler, the first outlet of the first cooler and the second cooler is connected to the inlet of the first filter and the second filter via the filter main pipeline, the first outlet of the first filter and the second filter is connected to the compressor lubricating oil supply end, and the oil return port of the lubricating oil tank is connected to the compressor lubricating oil return end. A first branch is provided between the inlets of the first cooler and the second cooler, and the second outlets of the first cooler and the second cooler are connected to the first return branch, which is connected to the lubricating oil tank. A second branch is provided between the inlets of the first filter and the second filter, and the second outlets of the first filter and the second filter are connected to the second return branch, which is connected to the lubricating oil tank.

[0006] Preferably, sight glasses are provided on the side of the first return branch and the second return branch that is close to the lubricating oil tank.

[0007] Preferably, a first valve is installed on the first branch; A first cooling circulation valve is installed on the pipeline between the second outlet of the first cooler and the first return branch, and a second cooling circulation valve is installed on the pipeline between the second outlet of the second cooler and the second return branch; A second valve is installed on the second branch; A first filter circulation valve is installed on the pipeline between the second outlet of the first filter and the second return branch, and a second filter circulation valve is installed on the pipeline between the second outlet of the second filter and the second return branch.

[0008] Preferably, the oil delivery assembly includes a main oil pump and an auxiliary oil pump. The inlets of the main oil pump and the auxiliary oil pump are connected to the oil outlet of the lubricating oil tank, and the outlets of the main oil pump and the auxiliary oil pump are connected to one end of the main oil inlet pipe of the cooler through their respective oil outlet pipes.

[0009] Preferably, the other end of the main oil inlet pipe of the cooler is connected to one port of the first three-way valve, and the other two ports of the first three-way valve are respectively connected to the inlets of the first cooler and the second cooler.

[0010] Preferably, one end of the filter main pipeline is connected to one port of the second three-way valve, and the other two ports of the second three-way valve are respectively connected to the first outlet of the first cooler and the first outlet of the second cooler.

[0011] Preferably, the other end of the filter main pipeline is connected to one port of the third three-way valve, and the other two ports of the third three-way valve are respectively connected to the inlets of the first filter and the second filter.

[0012] Preferably, the first outlets of the first filter and the second filter are respectively connected to one of the ports of the fourth three-way valve, the third port of the fourth three-way valve is connected to the compressor oil inlet pipe, and the compressor oil inlet pipe is connected to the compressor lubricating oil supply end.

[0013] Preferably, a temperature control valve is installed on the filter main pipeline, and a hot oil pipeline is connected between the cooler main oil inlet pipe and the inlet of the temperature control valve.

[0014] Preferably, a pressure regulating pipeline is connected between the outlet of the oil delivery component and the lubricating oil tank, and a pressure regulating valve is provided on the pressure regulating pipeline, with shut-off valves provided on both sides of the pressure regulating valve. A pressure tapping pipeline is connected between the first outlet of the first filter and the first outlet of the second filter and the pressure regulating interface of the pressure regulating valve.

[0015] The beneficial effects of this invention are: (1) In this invention, a first branch is provided between the inlets of the first cooler and the second cooler, and the second outlets of the first cooler and the second cooler are connected to the first return branch, which is connected to the lubricating oil tank; a second branch is provided between the inlets of the first filter and the second filter, and the second outlets of the first filter and the second filter are connected to the second return branch, which is connected to the lubricating oil tank. This arrangement enables that when the equipment in the first cooler and the second cooler is in use and is running normally, the cooler, which is a backup device, is also constantly circulating with lubricating oil; when the equipment in the first filter and the second filter is in use and is running normally, the filter, which is a backup device, is also constantly circulating with lubricating oil. This setup ensures that the standby equipment remains fully lubricated in standby mode, and that the lubricating oil within the standby equipment is continuously circulating during normal operation. Firstly, it resolves the issue of inconsistent vibrations between the standby equipment and its connecting pipelines, which are either unfilled or filled with oil. It also addresses system oil pressure fluctuations that occur during equipment switching when the compressor is running. Secondly, because the lubricating oil in the standby equipment is continuously circulating, and the source of the lubricating oil entering the normally used equipment is the same as that entering the standby equipment, it ensures that the oil temperature in the standby equipment is similar to that in the normally used equipment. Maintaining a consistent oil temperature within the equipment avoids temperature fluctuations during equipment switching. Third, because the lubricating oil in the standby equipment is in a circulating state, the lubricating oil entering the standby equipment flows back to the lubricating oil tank, while the lubricating oil flowing out of the lubricating oil tank is filtered by the oil outlet filter. In other words, the circulating state of the lubricating oil in the standby equipment carries any impurities that may be present in the standby equipment and its connecting pipes back to the lubricating oil tank for filtration, ensuring the cleanliness of the lubricating oil in the standby equipment. This, in turn, ensures the cleanliness of the lubricating oil entering the compressor motor spindle and gearbox after equipment switching.

[0016] (2) In this invention, when the pressure in the pressure tapping pipeline is higher than the opening pressure of the pressure regulating valve, the pressure regulating valve is opened, that is, the pressure regulating pipeline is connected, and a portion of the lubricating oil at the outlet of the oil delivery component returns to the lubricating oil tank along the pressure regulating pipeline to prevent the system oil pressure from being too high. The pressure in the pressure tapping pipeline is equal to the pressure in the compressor oil inlet pipe. The pressure of the lubricating oil entering the compressor can be controlled by setting the pressure tapping pipeline. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0018] Figure 1 This is a connection diagram of the compressor lubrication oil circuit system in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the connection of the compressor lubrication oil circuit system in Embodiment 2 of the present invention; in: 01. Compressor motor spindle; 02. Gearbox; 1. Lubricating oil tank; 2. First cooler; 21. First cooling circulation valve; 3. Second cooler; 31. Second cooling circulation valve; 4. First filter; 41. First filter circulation valve; 5. Second filter; 51. Second filter circulation valve; 6. Main filter pipeline; 61. Temperature control valve; 7. First branch; 71. First valve; 8. First return branch; 9. Second branch; 91. Second valve; 10. Second return branch; 11. Main oil pump; 111. First check valve ; 112. Main oil pump filter; 12. Auxiliary oil pump; 121. Second check valve; 13. Cooler main oil inlet pipe; 14. First three-way valve; 15. Second three-way valve; 16. Third three-way valve; 17. Fourth three-way valve; 18. Compressor oil inlet pipe; 19. Unit return oil line; 20. Hot oil line; 22. Pressure tapping line; 221. Shut-off valve; 23. Sight glass; 24. Pressure regulating line; 241. Pressure regulating valve; 242. Shut-off valve; 243. Bypass circuit; 244. Bypass valve. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: like Figure 1 As shown, a compressor lubrication system includes a lubrication tank 1, an oil delivery assembly, a cooling assembly, and a filter assembly, wherein an oil outlet filter is provided at the oil outlet of the lubrication tank 1. The cooling assembly includes a first cooler 2 and a second cooler 3 connected in parallel as backups for each other; the filtration assembly includes a first filter 4 and a second filter 5 connected in parallel as backups for each other. The oil outlet of the lubricating oil tank 1 is connected to the inlet of the oil delivery assembly, and the outlet of the oil delivery assembly is connected to the inlet of the first cooler 2 and the second cooler 3. The first outlet of the first cooler 2 and the second cooler 3 is connected to the inlet of the first filter 4 and the second filter 5 via the filter main pipeline 6. The first outlet of the first filter 4 and the second filter 5 is connected to the compressor lubricating oil supply end. The oil return port of the lubricating oil tank 1 is connected to the compressor lubricating oil return end, wherein the compressor lubricating oil return end is connected to the oil return port of the lubricating oil tank 1 via the unit oil return pipeline 19. A first branch 7 is provided between the inlets of the first cooler 2 and the second cooler 3, and the second outlets of the first cooler 2 and the second cooler 3 are connected to the first return branch 8. The first return branch 8 is connected to the lubricating oil tank 1. A second branch 9 is provided between the inlets of the first filter 4 and the second filter 5, and the second outlets of the first filter 4 and the second filter 5 are connected to the second return branch 10, which is connected to the lubricating oil tank 1.

[0021] Under normal operating conditions, when the first cooler 2 is in use and the second cooler 3 is in standby mode, the first branch 7 is connected, the second outlet of the first cooler 2 is disconnected from the first return branch 8, and the second outlet of the second cooler 3 is connected to the first return branch 8; when the first cooler 2 is in standby mode and the second cooler 3 is in use, the first branch 7 is connected, the second outlet of the first cooler 2 is connected to the first return branch 8, and the second outlet of the second cooler 3 is disconnected from the first return branch 8. Under normal operating conditions, when the first filter 4 is in use and the second filter 5 is in standby mode, the second branch 9 is connected, the second outlet of the first filter 4 is disconnected from the second return branch 10, and the second outlet of the second filter 5 is connected to the second return branch 10; when the first filter 4 is in standby mode and the second filter 5 is in use, the second branch 9 is connected, the second outlet of the first filter 4 is connected to the second return branch 10, and the second outlet of the second filter 5 is disconnected from the second return branch 10.

[0022] Preferably, a sight glass 23 is provided on the side of the first return branch 8 and the second return branch 10 near the lubricating oil tank 1 to observe whether the pipeline is blocked.

[0023] Preferably, a first valve 71 is provided on the first branch 7; A first cooling circulation valve 21 is installed on the pipeline between the second outlet of the first cooler 2 and the first return branch 8, and a second cooling circulation valve 31 is installed on the pipeline between the second outlet of the second cooler 3 and the second return branch 10. Under normal operating conditions, when the first cooler 2 is in use and the second cooler 3 is in standby mode, the first valve 71 and the second cooling circulation valve 31 are open, and the first cooling circulation valve 21 is closed; when the first cooler 2 is in standby mode and the second cooler 3 is in use, the first valve 71 and the first cooling circulation valve 21 are open, and the second cooling circulation valve 31 is closed. A second valve 91 is installed on the second branch 9; A first filter circulation valve 41 is installed on the pipeline between the second outlet of the first filter 4 and the second return branch 10, and a second filter circulation valve 51 is installed on the pipeline between the second outlet of the second filter 5 and the second return branch 10. Under normal operating conditions, when the first filter 4 is in use and the second filter 5 is in standby mode, the second valve 91 and the second filter circulation valve 51 are open, and the first filter circulation valve 41 is closed; when the first filter 4 is in standby mode and the second filter 5 is in use, the second valve 91 and the first filter circulation valve 41 are open, and the first filter circulation valve 51 is closed.

[0024] Preferably, the oil delivery assembly includes a main oil pump 11 and an auxiliary oil pump 12. The inlets of both the main oil pump 11 and the auxiliary oil pump 12 are connected to the oil outlet of the lubricating oil tank 1, and the outlets of the main oil pump 11 and the auxiliary oil pump 12 are connected to one end of the main oil inlet pipe 13 of the cooler via their respective oil outlet pipes. A main oil pump filter 112 and a first check valve 111 are installed on the pipe between the inlet of the main oil pump 11 and the lubricating oil tank 1, and a second check valve 121 is installed on the pipe between the outlet of the auxiliary oil pump 12 and the main oil inlet pipe 13 of the cooler.

[0025] Preferably, the other end of the main oil inlet pipe 13 of the cooler is connected to one port of the first three-way valve 14, and the other two ports of the first three-way valve 14 are respectively connected to the inlets of the first cooler 2 and the second cooler 3. During normal operation, the open and closed states of the two ports of the first three-way valve 14 connected to the inlets of the first cooler 2 and the second cooler 3 are different. That is, when the first cooler 2 is in use and the second cooler 3 is in standby, the port of the first three-way valve 14 connected to the inlet of the first cooler 2 is open and the port connected to the inlet of the second cooler 3 is closed. When the second cooler 3 is in use and the first cooler 2 is in standby, the port of the first three-way valve 14 connected to the inlet of the first cooler 2 is closed and the port connected to the inlet of the second cooler 3 is open.

[0026] Preferably, one end of the filter main pipeline 6 is connected to one port of the second three-way valve 15, and the other two ports of the second three-way valve 15 are respectively connected to the first outlet of the first cooler 2 and the second cooler 3. During normal operation, the two ports of the second three-way valve 15 connected to the first outlet of the first cooler 2 and the second cooler 3 have different open and closed states. That is, when the first cooler 2 is in use and the second cooler 3 is in standby, the port of the second three-way valve 15 connected to the first outlet of the first cooler 2 is open, and the port connected to the first outlet of the second cooler 3 is closed. When the second cooler 3 is in use and the first cooler 2 is in standby, the port of the second three-way valve 15 connected to the first outlet of the first cooler 2 is closed, and the port connected to the first outlet of the second cooler 3 is open.

[0027] Preferably, the other end of the main filter pipe 6 is connected to one port of the third three-way valve 16, and the other two ports of the third three-way valve 16 are respectively connected to the inlets of the first filter 4 and the second filter 5. During normal operation, the two ports of the third three-way valve 16 connected to the inlets of the first filter 4 and the second filter 5 have different open / closed states. That is, when the first filter 4 is in use and the second filter 5 is in standby, the port of the third three-way valve 16 connected to the inlet of the first filter 4 is open, and the port connected to the inlet of the second filter 5 is closed. When the second filter 5 is in use and the first filter 4 is in standby, the port of the third three-way valve 16 connected to the inlet of the first filter 4 is closed, and the port connected to the inlet of the second filter 5 is open.

[0028] Preferably, the first outlets of the first filter 4 and the second filter 5 are respectively connected to one of the interfaces of the fourth three-way valve 17, and the third interface of the fourth three-way valve 17 is connected to the compressor oil inlet pipe 18, which is connected to the compressor lubricating oil supply end. During normal operation, the two interfaces of the fourth three-way valve 17 connected to the first outlets of the first filter 4 and the second filter 5 have different open and closed states. That is, when the first filter 4 is in use and the second filter 5 is in standby, the interface of the fourth three-way valve 17 connected to the first outlet of the first filter 4 is open, and the interface connected to the first outlet of the second filter 5 is closed. When the second filter 5 is in use and the first filter 4 is in standby, the interface of the fourth three-way valve 17 connected to the first outlet of the first filter 4 is closed, and the interface connected to the first outlet of the second filter 5 is open.

[0029] Preferably, a temperature control valve 61 is provided on the filter main pipeline 6, and a hot oil pipeline 20 is connected between the cooler main oil inlet pipe 13 and the inlet of the temperature control valve 61.

[0030] In the compressor lubrication system of Example 1, when the first cooler 2 is in use and the second cooler 3 is in standby, the first valve 71 on the first branch 7 is open, the first cooling circulation valve 21 at the second outlet of the first cooler 2 is closed, and the second cooling circulation valve 31 at the second outlet of the second cooler 3 is open; when the first cooler 2 is in standby and the second cooler 3 is in use, the first valve 71 on the first branch 7 is open, the first cooling circulation valve 21 at the second outlet of the first cooler 2 is open, and the second cooling circulation valve 31 at the second outlet of the second cooler 3 is closed; when the first filter 4 is in use and the second filter 5 is in standby, the second valve 91 on the second branch 9 is open, the first filtration circulation valve 41 at the second outlet of the first filter 4 is closed, and the second filtration circulation valve 51 at the second outlet of the second filter 5 is open; when the first filter 4 is in standby and the second filter 5 is in use, the second valve 91 on the second branch 9 is open, the first filtration circulation valve 41 at the second outlet of the first filter 4 is open, and the second filtration circulation valve 51 at the second outlet of the second filter 5 is closed.

[0031] Taking the first cooler 2 and the first filter 4 as the operating state, and the second cooler 3 and the second filter 5 as the standby state as an example: The lubricating oil in the lubricating oil tank 1 enters the main oil pump 11 after passing through the main oil pump filter 112 and the first check valve 111, and enters the auxiliary oil pump 12. Then, the oil is combined through the respective oil outlet lines of the main oil pump 11 and the auxiliary oil pump 12. The combined oil enters the main oil inlet line 13 of the cooler, and then enters the first cooler 2 for heat exchange and cooling through the first three-way valve 14. The cooled lubricating oil flows out through the first outlet of the first cooler 2, and then enters the temperature control valve 61 through the second three-way valve 15. In the temperature control valve 61, the lubricating oil flows in through the hot oil line 20. The hot lubricating oil is mixed with the lubricating oil. After the lubricating oil reaches the set temperature, it enters the first filter 4 through the outlet of the temperature control valve 61, the filter main pipeline 6, and the third three-way valve 16 for filtration. The filtered lubricating oil enters the compressor oil inlet pipe 18 through the first outlet of the first filter 4 and the fourth three-way valve 17. The compressor oil inlet pipe 18 delivers the lubricating oil to the compressor lubricating oil supply end, and then enters the compressor motor main shaft 01 and gearbox 02 for lubrication. After lubrication, the oil flows back to the lubricating oil tank 1 through the unit return oil pipeline 19.

[0032] During the above process, a portion of the lubricating oil from the main oil inlet pipe 13 of the cooler enters the inlet of the second cooler 3 via the first branch 7, and then flows back to the lubricating oil tank 1 via the second outlet of the second cooler 3 and the first return branch 8; a portion of the lubricating oil from the main filter pipe 6 enters the inlet of the second filter 5 via the second branch 9, and then flows back to the lubricating oil tank 1 via the second outlet of the second filter 5 and the second return branch 10. That is, when the second cooler 3 and the second filter 5 are used as standby equipment, lubricating oil circulates inside them.

[0033] Similarly, when the equipment in the first cooler 2 and the second cooler 3 is in use and operating normally, the cooler, which serves as the standby equipment, is also constantly circulating with lubricating oil. Similarly, when the equipment in the first filter 4 and the second filter 5 is in use and operating normally, the filter, which serves as the standby equipment, is also constantly circulating with lubricating oil. This setup ensures that the standby equipment remains full of lubricating oil in standby mode, and that the lubricating oil in the standby equipment is in a state of circulation during normal operation. Firstly, this solves the problem of inconsistent vibration between the standby equipment and its connecting pipes when there is no oil filling and when there is oil filling, and also solves the problem of system oil pressure fluctuations during equipment switching during compressor operation. Secondly, because the lubricating oil in the standby equipment is in a state of circulation, and the source of the lubricating oil entering the normally used equipment is the same as that entering the standby equipment, it ensures that the oil temperature in the standby equipment is the same as that in the normally used equipment. The internal lubricating oil temperature remains consistent, avoiding temperature fluctuations during equipment switching. Third, since the lubricating oil in the standby equipment is in a circulating state, the lubricating oil entering the standby equipment flows back to the lubricating oil tank 1, while the lubricating oil flowing out of the oil outlet of the lubricating oil tank 1 is filtered by the oil outlet filter. In other words, the setting of the lubricating oil circulating state in the standby equipment carries any impurities that may exist in the standby equipment and its connecting pipelines back to the lubricating oil tank 1 for filtration, ensuring the cleanliness of the lubricating oil in the standby equipment, thereby ensuring the cleanliness of the lubricating oil entering the compressor motor main shaft 01 and gearbox 02 after equipment switching.

[0034] Example 2: Based on Example 1, such as Figure 2 As shown, a pressure regulating pipeline 24 is connected between the outlet of the oil supply component and the lubricating oil tank 1. A pressure regulating valve 241 is installed on the pressure regulating pipeline 24, and shut-off valves 242 are installed on both sides of the pressure regulating valve 241. A bypass circuit 243 is connected in parallel on the pipeline between the two shut-off valves 242. A bypass valve 244 is installed on the bypass circuit 243. The bypass valve 244 serves as a backup valve for the pressure regulating valve 241. A pressure tapping pipe 22 is connected between the first outlet of the first filter 4 and the first outlet of the second filter 5 and the pressure regulating port of the pressure regulating valve 241. That is, a pressure tapping pipe 22 is connected between the third port of the fourth three-way valve 17 and the pressure regulating port of the pressure regulating valve 241.

[0035] In Example 2, during normal operation, both shut-off valves 242 are open. The opening pressure of the pressure regulating valve 241 changes with the pressure of the compressor system to ensure stable oil pressure in the compressor system. When the pressure in the pressure tapping line 22 is higher than the opening pressure of the pressure regulating valve 241, the pressure regulating valve 241 is opened, that is, the pressure regulating line 24 is connected. A portion of the lubricating oil at the outlet of the oil delivery component returns to the lubricating oil tank 1 along the pressure regulating line 24 to prevent the system oil pressure from being too high. The pressure in the pressure tapping line 22 is equal to the pressure in the compressor oil inlet pipe 18. The pressure of the lubricating oil entering the compressor can be controlled by setting the pressure tapping line 22.

[0036] The pressure tapping line 22 is equipped with a shut-off valve 221. When the pressure regulating valve 241 fails and stops working, the shut-off valve 221 and the two stop valves 242 are closed, and the bypass valve 244 is opened. The bypass valve 244 adjusts the flow rate of lubricating oil returning from the outlet of the output component to the lubricating oil tank 1, thereby ensuring the stable operation of the compressor. At the same time, by closing the shut-off valve 221 and the two stop valves 242, the damaged pressure regulating valve 241 can be replaced.

[0037] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they are not intended to limit the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A compressor lubricating oil passage system characterized by comprising: Including lubricating oil tank (1), oil delivery assembly, cooling assembly, filter assembly, the oil outlet of lubricating oil tank (1) is provided with oil outlet filter; The cooling assembly includes first cooler (2) and second cooler (3) in parallel and standby for each other, and the filter assembly includes first filter (4) and second filter (5) in parallel and standby for each other; The oil outlet of the lubricating oil tank (1) is connected with the inlet of the oil delivery assembly, the outlet of the oil delivery assembly is connected with the inlet of the first cooler (2) and the second cooler (3), the first outlet of the first cooler (2) and the second cooler (3) is connected with the inlet of the first filter (4) and the second filter (5) through the filter main pipeline (6), the first outlet of the first filter (4) and the second filter (5) is connected with the lubricating oil supply end of the compressor, and the oil return port of the lubricating oil tank (1) is connected with the lubricating oil return end of the compressor. The first branch (7) is arranged between the inlets of the first cooler (2) and the second cooler (3), the second outlet of the first cooler (2) and the second cooler (3) is connected to the first backflow branch (8), and the first backflow branch (8) is communicated to the lubricating oil tank (1). The second branch (9) is arranged between the inlets of the first filter (4) and the second filter (5), the second outlet of the first filter (4) and the second filter (5) is connected to the second backflow branch (10), and the second backflow branch (10) is communicated to the lubricating oil tank (1).

2. The compressor lubricating oil passage system according to claim 1, characterized by, The first backflow branch (8) and the second backflow branch (10) are provided with sight glasses (23) on the side close to the lubricating oil tank (1).

3. The compressor lubricating oil passage system of claim 1, wherein, The first branch (7) is provided with a first valve (71); The pipeline between the second outlet of the first cooler (2) and the first backflow branch (8) is provided with a first cooling circulation valve (21), and the pipeline between the second outlet of the second cooler (3) and the second backflow branch (10) is provided with a second cooling circulation valve (31); The second branch (9) is provided with a second valve (91); The pipeline between the second outlet of the first filter (4) and the second backflow branch (10) is provided with a first filter circulation valve (41), and the pipeline between the second outlet of the second filter (5) and the second backflow branch (10) is provided with a second filter circulation valve (51).

4. The compressor lubricating oil passage system of claim 1, wherein The oil delivery assembly includes main oil pump (11) and auxiliary oil pump (12), the inlets of the main oil pump (11) and the auxiliary oil pump (12) are connected with the oil outlet of the lubricating oil tank (1), and the outlets of the main oil pump (11) and the auxiliary oil pump (12) are connected with one end of the cooler total oil inlet pipe (13) through respective oil outlet pipelines.

5. The compressor lubricating oil passage system of claim 4, wherein The other end of the cooler total oil inlet pipe (13) is connected with one interface of the first three-way valve (14), and the other two interfaces of the first three-way valve (14) are respectively connected with the inlets of the first cooler (2) and the second cooler (3).

6. The compressor lubricating oil passage system of claim 1, wherein, One end of the filter main pipeline (6) is connected with one interface of a second three-way valve (15), and the other two interfaces of the second three-way valve (15) are respectively connected with the first outlet of the first cooler (2) and the second cooler (3).

7. The compressor lubricating oil passage system of claim 1, wherein The other end of the filter main pipeline (6) is connected with one interface of a third three-way valve (16), and the other two interfaces of the third three-way valve (16) are respectively connected with the inlet of the first filter (4) and the second filter (5).

8. The compressor lubricating oil passage system of claim 1, wherein, The first outlet of the first filter (4) and the second filter (5) is respectively connected with one interface of a fourth three-way valve (17), the third interface of the fourth three-way valve (17) is connected with a compressor oil inlet pipe (18), and the compressor oil inlet pipe (18) is communicated to the lubricating oil supply end of the compressor.

9. The compressor lubricating oil passage system of claim 4, wherein, A temperature control valve (61) is arranged on the filter main pipeline (6), and a hot oil pipeline (20) is connected between the temperature control valve (61) and the inlet of the cooler total oil inlet pipe (13).

10. The compressor lubricating oil passage system of claim 1, wherein, A pressure regulating pipeline (24) is connected between the outlet of the oil feeding assembly and the lubricating oil tank (1), a pressure regulating valve (241) is arranged on the pressure regulating pipeline (24), and stop valves (242) are arranged on the two sides of the pressure regulating valve (241). A pressure taking pipeline (22) is connected between the first outlet of the first filter (4) and the second filter (5) and the pressure regulating interface of the pressure regulating valve (241).

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