Lubricating oil way system of compressor

Abstract

The utility model belongs to the technical field of compressors, and discloses a compressor lubricating oil way system which comprises a lubricating oil tank and a lubricating oil pump, and the oil inlet end of the lubricating oil pump is communicated with the oil outlet end of the lubricating oil tank through a pipeline. The oil inlet end of the lubricating oil filter is communicated with the oil outlet end of the lubricating oil cooler through a pipeline; the oil inlet end of the check valve is communicated with the oil outlet end of the self-operated regulating valve through a pipeline; the oil inlet end of the oil using equipment is communicated with the oil outlet end of the check valve through a pipeline, and the oil outlet end of the oil using equipment is communicated with the oil inlet end of the lubricating oil tank through an oil return pipeline; the oil inlet end of the manual valve is communicated with the oil outlet end of the check valve through an oil discharge pipeline, and the oil outlet end of the manual valve is communicated with the oil inlet end of the lubricating oil tank; the utility model solves the problem that a check valve in the prior art prevents oil from returning to an oil tank when a bearing of a compressor is overhauled.

Description

Technical Field

[0001] This solution belongs to the technical field of compressors, and specifically relates to a lubricating oil circuit system for a compressor. Background Art

[0002] A compressor is a device that compresses gas to increase its pressure, and is widely used in industry and daily life, such as refrigeration, gas transportation, and air separation. Since friction and heat are generated during the operation of the compressor, lubricating oil is required to reduce the friction between mechanical components, reduce wear, and at the same time help with heat dissipation to keep the equipment operating at an appropriate temperature. The lubricating oil circuit system is an important part of the compressor. It is responsible for transporting the lubricating oil from the oil tank to all parts that need lubrication, and through components such as an oil cooler, an oil filter, and a pressure reducing valve, to ensure the cleanliness, cooling, and pressure regulation of the oil to meet the working requirements of the compressor.

[0003] Refer to a common oil supply device for a steam turbine and a compressor with the existing publication (announcement) number CN202732006U, which includes an oil tank, a main oil pump, a self-operated backpressure primary regulating valve, a double oil cooler, a temperature control valve, and a double oil filter connected in sequence through pipelines. The oil outlet of the double oil filter is divided into three paths. One path is connected to the control oil inlet of the steam turbine through a pipeline, another path is first connected to the self-operated pressure reducing secondary regulating valve through a pipeline and then connected to the lubricating oil inlet of the steam turbine, and there is also a path that is first connected to the differential pressure secondary regulating valve through a pipeline and then connected to the lubricating oil inlet of the compressor. The common oil supply device is also provided with an auxiliary oil pump, and the auxiliary oil pump is connected between the oil tank and the backpressure primary regulating valve through a pipeline.

[0004] In the existing compressor oil station system, the main function of the check valve is to prevent the oil from flowing back during the lubricating oil circulation process, ensuring the unidirectional flow of the oil, so as to avoid the reverse flow of the oil when the compressor stops or runs in reverse. However, the presence of the check valve becomes an obstacle when overhauling the compressor bearing. Because the check valve is designed to prevent the reverse flow of the oil, during the overhaul process, when it is necessary to drain the lubricating oil from the system for cleaning or replacing the bearing, the check valve will hinder this process, making it impossible for the oil to return to the oil tank smoothly. This not only causes waste of lubricating oil, but also affects the overhaul efficiency of the bearing due to the oil remaining in the system, and even affects the secondary operation of the compressor because the oil cannot be drained in time. Summary of the Utility Model

[0005] The purpose of this solution is to provide a lubricating oil circuit system for a compressor to solve the problem that the check valve in the prior art hinders the return of the oil to the oil tank when overhauling the compressor bearing.

[0006] To achieve the above purpose, this solution provides a lubricating oil circuit system for a compressor, including a lubricating oil tank, and further including:

[0007] Lubricating oil pump, the inlet end of the lubricating oil pump is connected to the outlet end of the lubricating oil tank through a pipeline;

[0008] Lubricating oil cooler, the inlet end of the lubricating oil cooler is connected to the outlet end of the lubricating oil pump through a pipeline;

[0009] Lubricating oil filter, the inlet end of the lubricating oil filter is connected to the outlet end of the lubricating oil cooler through a pipeline;

[0010] Self-operated regulating valve, the inlet end of the self-operated regulating valve is connected to the outlet end of the lubricating oil filter through a pipeline;

[0011] Check valve, the inlet end of the check valve is connected to the outlet end of the self-operated regulating valve through a pipeline;

[0012] Oil-using equipment, the inlet end of the oil-using equipment is connected to the outlet end of the check valve through a pipeline, and the outlet end of the oil-using equipment is connected to the inlet end of the lubricating oil tank through a return oil pipeline;

[0013] Manual valve, the inlet end of the manual valve is connected to the outlet end of the check valve through a drain pipeline, and the outlet end of the manual valve is connected to the inlet end of the lubricating oil tank.

[0014] The principle of this solution is as follows: First, the lubricating oil required by the oil-using equipment is first stored in the lubricating oil tank, and then pressurized by the lubricating oil pump. The pressurized lubricating oil enters the lubricating oil cooler and is cooled to reduce the temperature, avoiding deterioration of the lubricating oil and decline in performance caused by high temperature. Then, the lubricating oil passes through the lubricating oil filter to remove impurities and particulate matter. The lubricating oil passing through the lubricating oil filter is then regulated by the self-operated regulating valve to keep its pressure within an appropriate range to meet the lubrication requirements of the oil-using equipment. Second, a drain pipeline is tapped and connected to the outlet end of the check valve, and the other end of the drain pipeline is connected to the lubricating oil tank. At the same time, a manual valve is provided on the drain pipeline to connect or cut off the circuit between the drain pipeline and the lubricating oil tank. When it is necessary to repair the bearings of the oil-using equipment, the manual valve is manually opened to allow the lubricating oil in the pipeline at the inlet end of the oil-using equipment to flow back into the lubricating oil tank.

[0015] The effects of this solution are as follows: (1) By setting a manual valve and an oil drain pipe, the operator can manually open the manual valve on the oil drain pipe, allowing the oil that was originally blocked by the check valve to flow back into the lubricating oil tank. This avoids the problem of oil remaining in the pipe due to the check valve and simplifies the maintenance process, as the operator no longer needs to take additional measures to remove or bypass the check valve. (2) When repairing the oil-using equipment, the lubricating oil in the pipe can flow back into the lubricating oil tank, avoiding waste of lubricating oil, helping to reduce maintenance costs, and also reducing the consumption and replacement frequency of lubricating oil. (3) During non-maintenance periods, the manual valve remains closed, and the system can operate normally. The check valve continues to play its role in preventing oil from flowing back, ensuring the stable operation of the system. During maintenance, by simply operating the manual valve, the recovery of oil can be achieved, and the improvement is both practical and efficient.

[0016] Further, the oil-using equipment includes a compressor and a steam turbine. The oil inlet end of the compressor is connected to the oil outlet end of the check valve through a pipe, and the oil outlet end of the compressor is connected to the oil inlet end of the lubricating oil tank through an oil return pipe; the oil inlet end of the steam turbine is connected to the oil outlet end of the check valve through a pipe, and the oil outlet end of the steam turbine is connected to the oil inlet end of the lubricating oil tank through an oil return pipe.

[0017] The principle and effects of this solution are as follows: By connecting the oil inlet ends of the compressor and the steam turbine to the oil outlet end of the check valve, the lubricating oil system continuously lubricates and supplies oil to the compressor and the steam turbine, and enables the one-way flow of oil during normal operation, effectively avoiding the reverse flow phenomenon. At the same time, the oil outlet end is connected to the lubricating oil tank through an oil return pipe, ensuring the recovery and reuse of oil.

[0018] Further, the oil-using equipment includes a compressor and a steam turbine. The oil inlet end of the compressor is connected to the oil outlet end of the check valve through a pipe, and the oil outlet end of the compressor is connected to the oil inlet end of the lubricating oil tank through an oil return pipe; the oil inlet end of the steam turbine is connected to the oil outlet end of the check valve through a pipe, and the oil outlet end of the steam turbine is connected to the oil inlet end of the lubricating oil tank through an oil return pipe.

[0019] Further, it also includes a pressurizing component. The pressurizing component includes an oil storage tank and an oil delivery pipe connected to the oil storage tank. There is lubricating oil in the oil storage tank. The oil delivery pipe is connected to a branch pipe, and the branch pipe is connected to the oil drain pipe. An extrusion unit is provided in the oil storage tank, and the extrusion unit is used to extrude the lubricating oil in the oil storage tank.

[0020] The principle and effect of this solution are as follows: (1) Since the duration of the oil-using equipment without maintenance must be much longer than the maintenance duration, that is, the operating duration is definitely longer than the equipment maintenance duration. Therefore, when the system is operating normally, as the manual valve is in the closed state for a long time, this will cause the lubricating oil in the oil discharge pipe to be in a static state for a long time. In this static state, impurities and particulate matters in the lubricating oil will gradually deposit on the inner wall of the pipe, forming sludge and carbon deposits, and these deposits will gradually thicken over time. At the same time, the oil discharge pipe is in a system shutdown and maintenance state when discharging oil, so the oil discharge pipe lacks pressure. When it is necessary to discharge oil through the manual valve, due to the lack of power provided by the oil pump, the oil flow is slow, resulting in low oil discharge efficiency. The slow oil flow cannot effectively carry and remove the deposits in the pipe. (2) Lubricating oil is poured into the storage tank through the oil delivery pipe. When the oil discharge pipe needs to discharge oil, the lubricating oil in the storage tank is squeezed by the squeezing unit. The lubricating oil flows to the oil delivery pipe, then to the branch pipe, and finally into the oil discharge pipe, thereby applying a pressure to the oil in the oil discharge pipe, promoting the smooth flow of the oil path in the oil discharge pipe and a faster flow rate. (3) Through the pressurizing component, including the storage tank and the squeezing unit, pressure is applied to the lubricating oil in the storage tank to pressurize the lubricating oil in the oil discharge pipe, avoiding the problem of slow oil flow in the oil discharge pipe due to lack of pressure in the original system. This pressurizing effect not only promotes the rapid flow of the oil, but also helps to remove the deposits in the pipe, prevent the formation of sludge and carbon deposits, and thus reduce the risk of pipe blockage.

[0021] Further, the squeezing unit includes an electromagnet and a permanent magnet that cooperates with the electromagnet. The electromagnet is provided on the outer wall of the storage tank, the permanent magnet is slidably provided on the inner wall of the storage tank, the permanent magnet is connected with a spring, and the free end of the spring is fixedly connected with the inner wall of the storage tank.

[0022] The principle and effect of this solution are as follows: (1) By the power-on and power-off of the electromagnet, after the permanent magnet loses the attraction of the electromagnet, it squeezes the lubricating oil in the storage tank under the drive of the spring, thereby squeezing the lubricating oil into the oil discharge pipe and pressurizing the lubricating oil in the oil discharge pipe. (2) Through the interaction between the electromagnet and the permanent magnet, when the electromagnet is powered on and off, the permanent magnet pushes the lubricating oil under the action of the spring force, ensuring that even when the system is shut down or in a maintenance state, the lubricating oil can be effectively discharged into the oil discharge pipe, applying the necessary pressure to promote the oil flow and avoiding the deposition and blockage of the oil in the pipe.

[0023] Further, a first contact is provided on the handle of the manual valve, and a second contact is provided on the valve body of the manual valve. The electromagnet is powered off after the first contact and the second contact come into contact.

[0024] The principle and effect of this solution are as follows: (1) By rotating the handle of the manual valve, the first contact is brought into contact with the second contact, thereby de-energizing the electromagnet and squeezing the lubricating oil in the oil discharge pipeline. (2) By rotating the valve to open the passage between the oil discharge pipeline and the lubricating oil tank, in this necessary step, the electromagnet is de-energized, ensuring that the electromagnet can be de-energized in a timely manner during the oil discharge process, thereby activating the extrusion unit and pushing the lubricating oil in the storage tank into the oil discharge pipeline. This avoids additional control steps and reduces the possibility of human operation errors. At the same time, since the de-energization of the electromagnet is directly triggered by the valve operation, this process does not require additional electrical or mechanical connections, simplifying the system design.

[0025] Further, a piston is provided in the storage tank, the piston is slidably connected to the inner wall of the storage tank, and the permanent magnet is provided in the piston.

[0026] The principle and effect of this solution are as follows: When the electromagnet is de-energized, the permanent magnet pushes the piston under the action of the spring force, thereby squeezing the lubricating oil. Through the pushing action of the piston, the lubricating oil can be transported to the oil discharge pipe more evenly and continuously. At the same time, the sliding connection of the piston reduces mechanical friction and ensures the sealing performance inside the storage tank.

[0027] Further, a first one-way valve is provided on the oil delivery pipe.

[0028] The principle and effect of this solution are as follows: To make the liquid in the oil delivery pipe flow unidirectionally in a predetermined direction.

[0029] Further, a second one-way valve is provided on the branch pipe.

[0030] The principle and effect of this solution are as follows: To make the liquid in the branch pipe flow unidirectionally in a predetermined direction

[0031] Further, blind plates are provided on the check valve and the manual valve.

[0032] The principle and effect of this solution are as follows: To decorate the oil inlet end and the oil outlet end of the check valve and the manual valve.

[0033] Further, the manual valve is provided 50 mm from the oil outlet end of the check valve.

[0034] The principle and effect of this solution are as follows: By setting the manual valve 50 mm from the oil outlet end of the check valve, this layout enables the operator to quickly and conveniently operate the valve when oil discharge or oil circuit switching is required, thus improving the efficiency of maintenance and repair work. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a compressor lubricating oil circuit system of the present utility model;

[0036] Figure 2 This is a schematic structural diagram of the supercharging component of the present utility model.

[0037] The names of the corresponding marks in the attached drawings are: lubricating oil tank 1, lubricating oil pump 2, lubricating oil cooler 3, lubricating oil filter 4, self-operated regulating valve 5, check valve 6, compressor 7, steam turbine 8, oil return pipe 9, manual valve 10, handle 101, first contact 102, valve body 103, second contact 104, oil discharge pipe 11, supercharging component 12, storage tank 121, oil delivery pipe 122, branch pipe 123, extrusion unit 124, electromagnet 1241, permanent magnet 1242, spring 1243, first check valve 125, second check valve 126. Specific embodiments

[0038] The following will clearly and completely describe the concept and technical effects generated by the present utility model in combination with embodiments to fully understand the purpose, features, and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present utility model:

[0039] Embodiment:

[0040] Please refer to Figure 1 , a lubricating oil circuit system for a compressor, including a lubricating oil tank 1, a lubricating oil pump 2, a lubricating oil cooler 3, a lubricating oil filter 4, a self-operated regulating valve 5, a check valve 6, a compressor 7, and a steam turbine 8 connected in sequence through pipelines. The compressor 7 and the steam turbine 8 are communicated with the oil inlet end of the lubricating oil tank 1 through an oil return pipe 9 to realize the circulation of the lubricating oil in the lubricating oil circuit. It also includes an oil discharge pipe 11, and the oil discharge pipe 11 is communicated with the oil outlet end (50 mm away from the oil outlet end) of the check valve 6. A manual valve 10 is arranged on the oil discharge pipe 11, and a blind plate (flange) is installed on the manual valve 10. Among them, when the system operates, the flow path of the oil circuit is: lubricating oil tank 1 → lubricating oil pump 2 → lubricating oil cooler 3 → lubricating oil filter 4 → self-operated regulating valve 5 → check valve 6 → compressor 7 → steam turbine 8 → lubricating oil tank 1. When the system is shut down for maintenance, the flow path of the oil circuit is: compressor 7 → steam turbine 8 → oil discharge pipe 11 → manual valve 10 → lubricating oil tank 1.

[0041] First, the lubricating oil required for the compressor 7 and the steam turbine 8 is first stored in the lubricating oil tank 1, and then pressurized by the lubricating oil pump 2. The pressurized lubricating oil enters the lubricating oil cooler 3 and is cooled to reduce the temperature, avoiding deterioration of the lubricating oil and decline in performance caused by high temperature. Then, the lubricating oil passes through the lubricating oil filter 4 to remove impurities and particulate matter therein. The lubricating oil passing through the lubricating oil filter 4 is then regulated by the self-acting regulating valve 5 to keep its pressure within an appropriate range to meet the lubrication requirements of the compressor 7 and the steam turbine 8. Secondly, an oil discharge pipe 11 is connected by tapping at the oil outlet end of the check valve 6, and the other end of the oil discharge pipe 11 is communicated with the lubricating oil tank 1. At the same time, a manual valve 10 is provided on the oil discharge pipe 11 to connect or cut off the circuit between the oil discharge pipe 11 and the lubricating oil tank 1. When it is necessary to overhaul the bearings of the compressor 7 and the steam turbine 8, the manual valve 10 is manually opened to make the lubricating oil in the oil inlet pipe of the compressor 7 and the steam turbine 8 flow back into the lubricating oil tank 1.

[0042] Please refer to Figure 2 , and further includes a pressurizing assembly 12. The pressurizing assembly 12 includes an oil storage tank 121 and an oil delivery pipe 122 communicated with the oil storage tank 121. A first one-way valve 125 is provided on the oil delivery pipe 122 to make the lubricating oil in the oil delivery pipe 122 flow in a preset direction, that is, flow unidirectionally from the oil delivery pipe 122 into the oil storage tank 121. There is lubricating oil in the oil storage tank 121. The oil delivery pipe 122 is communicated with a branch pipe 123, and the branch pipe 123 is communicated with the oil discharge pipe 11. A second one-way valve 126 is provided on the branch pipe 123 to make the lubricating oil in the branch pipe 123 flow in a preset direction, flowing from the branch pipe 123 to the oil discharge pipe 11. An extrusion unit 124 is provided in the oil storage tank 121. The extrusion unit 124 includes an electromagnet 1241 and a permanent magnet 1242 cooperating with the electromagnet 1241. The electromagnet 1241 is provided on the outer wall of the oil storage tank 121. A piston is provided in the oil storage tank 121, and the piston is slidably connected to the inner wall of the oil storage tank 121. The permanent magnet 1242 is provided in the piston, and the piston is connected with a spring 1243. The free end of the spring 1243 is fixedly connected to the inner wall of the oil storage tank 121.

[0043] Since the unmaintained duration of the compressor 7 and the steam turbine 8 is surely much longer than the maintenance duration, that is, the operating duration is definitely longer than the equipment maintenance duration. Therefore, when the system is operating normally, since the manual valve 10 is in the closed state for a long time, this will cause the lubricating oil in the oil discharge pipe 11 to be in a static state for a long time. In this static state, impurities and particulate matters in the lubricating oil will gradually deposit on the inner wall of the pipe, forming sludge and carbon deposits, and these deposits will gradually thicken with the passage of time. At the same time, the oil discharge pipe 11 is in the system shutdown and maintenance state when discharging oil, so the oil discharge pipe 11 lacks pressure. When it is necessary to discharge oil through the manual valve 10, due to the lack of power provided by the oil pump, the oil flow is slow, resulting in low oil discharge efficiency. The slow oil flow cannot effectively carry and remove the deposits in the pipe. Lubricating oil is poured into the oil storage tank 121 through the oil delivery pipe 122. When the oil discharge pipe 11 needs to discharge oil, by the power-on and power-off of the electromagnet 1241, after the permanent magnet 1242 loses the attraction of the electromagnet 1241, under the drive of the spring 1243, the lubricating oil in the oil storage tank 121 is squeezed, so as to squeeze the lubricating oil into the oil discharge pipe 11 and apply pressure to the lubricating oil in the oil discharge pipe 11. Thus, a pressure is applied to the oil in the oil discharge pipe, promoting the smooth flow of the oil path in the oil discharge pipe, with a faster flow rate, and helping to remove the deposits in the pipe, preventing the formation of sludge and carbon deposits, thereby reducing the risk of pipe blockage.

[0044] A first contact 102 is provided on the handle 101 of the manual valve 10, and a second contact 104 is provided on the valve body 103 of the manual valve 10. After the first contact 102 contacts the second contact 104, the electromagnet 1242 is powered off. By rotating the handle 101 of the manual valve 10, the first contact 102 is made to contact the second contact 104, so that the electromagnet 1242 is powered off, squeezing the lubricating oil in the oil discharge pipe 11. By rotating the valve 10 to open the passage between the oil discharge pipe 11 and the lubricating oil tank 1, in this necessary step, the electromagnet 1242 is powered off, ensuring that the electromagnet 1242 can be powered off in time during the oil discharge process, so as to activate the extrusion unit 124 and push the lubricating oil in the oil storage tank 121 into the oil discharge pipe 11.

[0045] The above are only the embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A compressor lubricating oil circuit system, including a lubricating oil tank (1), characterized in that, Further comprising: A lubricating oil pump (2), the inlet end of the lubricating oil pump (2) is connected to the outlet end of the lubricating oil tank (1) through a pipeline; A lubricating oil cooler (3), the inlet end of the lubricating oil cooler (3) is connected to the outlet end of the lubricating oil pump (2) through a pipeline; A lubricating oil filter (4), the inlet end of the lubricating oil filter (4) is connected to the outlet end of the lubricating oil cooler (3) through a pipeline; A self-operated regulating valve (5), the inlet end of the self-operated regulating valve (5) is connected to the outlet end of the lubricating oil filter (4) through a pipeline; A check valve (6), the inlet end of the check valve (6) is connected to the outlet end of the self-operated regulating valve (5) through a pipeline; An oil-using device, the inlet end of the oil-using device is connected to the outlet end of the check valve (6) through a pipeline, and the outlet end of the oil-using device is connected to the inlet end of the lubricating oil tank (1) through an oil return pipeline (9); A manual valve (10), the inlet end of the manual valve (10) is connected to the outlet end of the check valve (6) through an oil discharge pipeline (11), and the outlet end of the manual valve (10) is connected to the inlet end of the lubricating oil tank (1).

2. The compressor lubricating oil path system according to claim 1, wherein: The oil-using device includes a compressor (7) and a steam turbine (8). The inlet end of the compressor (7) is connected to the outlet end of the check valve (6) through a pipeline, and the outlet end of the compressor (7) is connected to the inlet end of the lubricating oil tank (1) through an oil return pipeline (9); the inlet end of the steam turbine (8) is connected to the outlet end of the check valve (6) through a pipeline, and the outlet end of the steam turbine (8) is connected to the inlet end of the lubricating oil tank (1) through an oil return pipeline (9).

3. The compressor lubricating oil path system according to claim 1, characterized in that: Further comprising a boosting assembly (12), the boosting assembly (12) includes an oil storage tank (121) and an oil delivery pipe (122) connected to the oil storage tank (121). Lubricating oil is provided in the oil storage tank (121). The oil delivery pipe (122) is connected to a branch pipe (123), and the branch pipe (123) is connected to the oil discharge pipeline (11). An extrusion unit (124) is provided in the oil storage tank (121), and the extrusion unit (124) is used for extruding the lubricating oil in the oil storage tank (121).

4. The compressor lubricating oil path system according to claim 3, characterized in that: The extrusion unit (124) includes an electromagnet (1241) and a permanent magnet (1242) cooperating with the electromagnet (1241). The electromagnet (1241) is provided on the outer wall of the oil storage tank (121), the permanent magnet (1242) is slidably provided on the inner wall of the oil storage tank (121), the permanent magnet (1242) is connected to a spring (1243), and the free end of the spring (1243) is fixedly connected to the inner wall of the oil storage tank (121).

5. The compressor lubricating oil path system according to claim 4, characterized in that: A first contact (102) is provided on the handle (101) of the manual valve (10), a second contact (104) is provided on the valve body (103) of the manual valve (10), and the electromagnet (1241) is powered off after the first contact (102) contacts the second contact (104).

6. The compressor lubricating oil path system according to claim 4, characterized in that: A piston is provided in the oil storage tank (121), the piston is slidably connected to the inner wall of the oil storage tank (121), and the permanent magnet (1242) is provided in the piston.

7. The compressor lubricating oil path system according to claim 4, wherein: A first one-way valve (125) is provided on the oil pipeline (122).

8. The compressor lubricating oil path system according to claim 4, characterized in that: A second one-way valve (126) is provided on the branch pipe (123).

9. The compressor lubricating oil path system according to claim 1, wherein: Blind plates are provided on the check valve (6) and the manual valve (10).

10. The compressor lubricating oil path system according to claim 1, wherein: The manual valve (10) is provided at a position 50 mm from the oil outlet end of the check valve (6).

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