Cleaning module

Abstract

The utility model belongs to the technical field of turbojet engine detection, and discloses a cleaning module which comprises a cleaning gas cylinder used for storing inert gas for cleaning. The interior of the fuel tank is divided into an oil storage cavity and an oil return cavity, a communication assembly is communicated between the oil storage cavity and the oil return cavity, and inert gas is recycled at the top end of the oil return cavity through a recycling pipe. The oil pipe assembly comprises an oil supply pipe communicated between the turbojet engine and the oil storage cavity, and an oil return pipe is communicated between the oil supply pipe and the oil return cavity; the gas pipe assembly comprises a cleaning pipe communicated between an outlet of the cleaning gas bottle and the oil supply pipe, and inert gas blows fuel oil in the oil supply pipe back into the oil return cavity through the oil return pipe. The device is convenient to use, can reversely clean a turbojet engine and a fuel oil pipeline after the turbojet engine is tested, reduces fuel oil waste during disassembly, can reduce pollution to a test space, improves safety, cools the high-temperature turbojet engine, and accelerates test efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of turbojet engine testing technology, and in particular relates to a cleaning module. Background Technology

[0002] In the field of aviation industry and high-performance power system research and development, turbojet engines, as core power units, require precise testing of their performance parameters for improving engine efficiency, optimizing structural design, and ensuring flight safety. During turbojet engine testing, fuel supply is required to ensure the engine can operate under different conditions, and fuel consumption exceeding parameters can also be detected.

[0003] However, after the turbojet engine is tested, residual fuel is returned through the common pipeline. After the turbojet engine is disassembled, the residual fuel will leak, resulting in fuel waste. At the same time, the leaked fuel will pollute the test environment and increase the danger in the test space. Moreover, the turbojet engine is hot after testing and cannot be disassembled, which is dangerous. It needs to be cooled down before proceeding to the next step, which reduces the testing efficiency of the turbojet engine.

[0004] Therefore, this application designs a cleaning module to solve the aforementioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a cleaning module.

[0006] To achieve the above objectives, this utility model provides a cleaning module, comprising:

[0007] A cleaning gas cylinder, the cleaning gas cylinder being used to store inert gas for cleaning;

[0008] The fuel tank is divided into a fuel storage chamber and a fuel return chamber. A communication component connects the fuel storage chamber and the fuel return chamber. Inert gas is recovered through a recovery pipe at the top of the fuel return chamber.

[0009] An oil pipe assembly, the oil pipe assembly including an oil supply pipe connecting the turbojet engine and the oil reservoir, and an oil return pipe connecting the oil supply pipe and the oil return reservoir;

[0010] The gas pipe assembly includes a cleaning pipe connecting the outlet of the cleaning gas cylinder and the fuel supply pipe, wherein inert gas backflushs the fuel in the fuel supply pipe into the fuel return chamber through the fuel return pipe.

[0011] Preferably, the communication component includes a communication hole formed at the bottom end of the oil return chamber, a communication block that can be opened and closed is provided in the communication hole, the communication block is drivenly connected to a control rod, the control rod extends out of the oil return chamber and is drivenly connected to the end of an operating plate provided at the top of the oil return chamber.

[0012] Preferably, a support base is hinged to the middle of the operation plate, the bottom end of the support base is fixedly connected to the top end of the oil return chamber, and a positioning rod for positioning is hinged to the end of the operation plate away from the control rod, the bottom end of the positioning rod is hinged to the top end of the oil return chamber.

[0013] Preferably, the top end of the control lever is provided with a transversely arranged transmission groove, a transmission rod is slidably disposed in the transmission groove, both ends of the transmission rod extend out of the transmission groove and are respectively fixedly connected to a transmission plate, and the top end of the transmission plate is fixedly connected to the operation plate.

[0014] Preferably, the top sidewall of the control rod is fixed with a plurality of equally spaced extension plates, and a plurality of first return springs in a compressed state are provided between the bottom end of the extension plates and the top end of the oil return chamber.

[0015] Preferably, a connecting rod is slidably connected to the connecting block, the connecting rod is kinetically connected to the control rod, an oil guiding channel is provided inside the connecting rod, the top end of the oil guiding channel is connected to the oil return chamber through several oil inlet holes, and the bottom end of the oil guiding channel is connected to several oil outlet holes, which are connected to the oil storage chamber.

[0016] Preferably, a baffle plate is inclinedly arranged inside the oil return chamber, and the outlet of the oil return pipe is located below the baffle plate. The mixture of fuel and inert gas ejected from the oil return pipe impacts the baffle plate.

[0017] Preferably, the oil supply pipe is equipped with an oil supply pump, and a first one-way valve that opens only towards the turbojet engine is provided between the oil supply pump and the turbojet engine. The connection points of the return oil pipe and the cleaning pipe with the oil supply pipe are arranged sequentially in the direction towards the turbojet engine.

[0018] Preferably, the return oil pipe is provided with a second one-way valve that opens unidirectionally to the return oil chamber, and the cleaning pipe is provided with a third one-way valve that opens unidirectionally to the supply oil pipe.

[0019] Compared with the prior art, this utility model has the following advantages and technical effects: This utility model discloses a cleaning module. During the testing of a turbojet engine, the fuel stored in the fuel tank's reservoir is supplied to the turbojet engine through the fuel pipe for its operation. The cleaning gas cylinder is filled with inert gas as a cleaning power source. After the turbojet engine test is completed, the inert gas is introduced into the fuel supply pipe through the cleaning pipe. Using the connection point as the dividing point, the fuel near the reservoir is blown back into the return chamber through the return pipe, avoiding fuel leakage in the fuel supply pipe during disassembly, reducing fuel waste, avoiding pollution of the test environment, improving safety, and also clearing the fuel tank. The fuel line prevents residual fuel from affecting subsequent fuel consumption parameter measurements of the turbojet engine. The mixture of inert gas and fuel entering the return oil chamber is separated. The inert gas is discharged or recycled in the next process, while the recycled fuel is stored in the return oil chamber. After a period of time, the fuel is returned to the reservoir through the connecting component for later use. The fuel in the fuel supply pipe at the other end of the connection point and the fuel in the turbojet engine are discharged to prevent fuel residue in the engine and facilitate subsequent processing of the turbojet engine. At the same time, the inert gas blown in reverse can also accelerate the cooling speed of the turbojet engine, facilitate subsequent disassembly, and speed up the testing efficiency of the turbojet engine.

[0020] This invention is easy to use and can clean the turbojet engine and fuel lines in reverse after the turbojet engine test is completed, reducing fuel waste during disassembly, reducing pollution of the test space, improving safety, and cooling down the high-temperature turbojet engine, thus speeding up the test efficiency. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is an axial view of the cleaning module of this utility model;

[0023] Figure 2 This is a schematic diagram of the fuel tank structure of this utility model;

[0024] Figure 3 For this utility model Figure 2 A magnified view of part A in the image;

[0025] Figure 4 For this utility model Figure 2 A magnified view of part B in the image;

[0026] In the diagram: 1. Cleaning gas cylinder; 2. Fuel tank; 3. Fuel line assembly; 4. Gas line assembly; 5. Turbojet engine; 21. Fuel reservoir; 22. Fuel return chamber; 23. Recovery pipe; 24. Connecting hole; 25. Connecting block; 26. Control lever; 27. Operating panel; 28. Support base; 29. ​​Positioning rod; 210. Transmission groove; 211. Transmission rod; 212. Transmission plate; 213. Extension plate; 214. First return spring; 215. Connecting... 216. Through rod; 217. Oil guide channel; 218. Oil inlet; 219. Oil outlet; 220. Connecting plate; 221. Second return spring; 222. Barrier plate; 222. Guide buckle; 223. Isolation net; 224. Oil dipstick; 225. Drain port; 31. Oil supply pipe; 32. Oil return pipe; 33. Oil supply pump; 34. First check valve; 35. Second check valve; 41. Cleaning pipe; 42. Third check valve; 43. Compressor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-Figure 4 As shown, this embodiment provides a cleaning module, including:

[0030] Cleaning gas cylinder 1 is used to store inert gas for cleaning.

[0031] Fuel tank 2 is divided into oil storage chamber 21 and oil return chamber 22. The oil storage chamber 21 and oil return chamber 22 are connected by a connecting component. The top of the oil return chamber 22 recovers inert gas through recovery pipe 23.

[0032] Oil pipe assembly 3, the oil pipe assembly 3 includes an oil supply pipe 31 that connects the turbojet engine 5 and the oil storage chamber 21, and an oil return pipe 32 that connects the oil supply pipe 31 and the oil return chamber 22.

[0033] The gas pipe assembly 4 includes a cleaning pipe 41 connecting the outlet of the cleaning gas cylinder 1 and the fuel supply pipe 31. Inert gas backflushs the fuel in the fuel supply pipe 31 into the return chamber 22 via the return pipe 32. This utility model discloses a cleaning module. During testing of the turbojet engine 5, the fuel stored in the fuel storage chamber 21 of the fuel tank 2 is supplied to the turbojet engine 5 through the fuel pipe for its operation. The cleaning gas cylinder 1 is filled with inert gas as a cleaning power source. After the turbojet engine 5 test is completed, the inert gas is introduced into the fuel supply pipe 31 through the cleaning pipe 41. Using the connection point as a dividing point, the fuel near the fuel storage chamber 21 is backflushd into the return chamber 22 via the return pipe 32. This avoids fuel leakage from the fuel supply pipe 31 during disassembly, reduces fuel waste, avoids pollution of the test environment, improves safety, and also empties the fuel lines, preventing residual fuel. Fuel affects the subsequent measurement of fuel consumption parameters of the turbojet engine 5. The mixture of inert gas and fuel entering the return oil chamber 22 is separated; the inert gas is discharged or recovered in the next process, while the recovered fuel is stored in the return oil chamber 22. After a period of time, the fuel is returned to the storage chamber 21 via a connecting component for later use. Meanwhile, the fuel in the fuel supply pipe 31 at the other end of the connection point and the fuel in the turbojet engine 5 are expelled, preventing fuel residue in the engine and facilitating subsequent processing of the turbojet engine 5. Simultaneously, the inert gas blowing in reverse accelerates the cooling rate of the turbojet engine 5, facilitating subsequent disassembly and increasing the testing efficiency of the turbojet engine 5. This invention is convenient to use, allowing for reverse cleaning of the turbojet engine 5 and fuel lines after testing, reducing fuel waste during disassembly, minimizing contamination of the testing space, improving safety, and simultaneously cooling the high-temperature turbojet engine 5, thus accelerating testing efficiency.

[0034] In one embodiment of this application, the bottom of the inner cavity of the oil storage chamber 21 is inclined towards the middle, and a drain port 225 is provided at the lowest end to facilitate the draining of fuel in the oil storage chamber 21.

[0035] In one embodiment of this application, the side wall of the oil storage chamber 21 is provided with an oil dipstick 224 for displaying the oil level. The dipstick 224 is transparent, which makes it easy to observe the amount of fuel in the oil storage chamber 21.

[0036] In one embodiment of this application, nitrogen is chosen as the inert gas because it is convenient to prepare and store.

[0037] A further optimized design includes a connecting component comprising a connecting hole 24 at the bottom of the return oil chamber 22, with an openable and closable connecting block 25 within the connecting hole 24. The connecting block 25 is connected to a control rod 26, which extends out of the return oil chamber 22 and is connected to the end of an operating plate 27 located at the top of the return oil chamber 22. When it is necessary to discharge the fuel recovered from the return oil chamber 22, the operating plate 27 at the top of the return oil chamber 22 is engaged, and the control rod 26 controls the opening of the connecting block 25, connecting the return oil chamber 22 and the oil storage chamber 21. The fuel in the return oil chamber 22 is then discharged into the oil storage chamber through the opened connecting block 25.

[0038] In one embodiment of this application, the sidewall of the oil return chamber 22 is provided with a plurality of longitudinally arranged guide buckles 222, and the control rod 26 passes through the fixed buckle and is slidably connected to the fixed buckle to stabilize and guide the control rod 26.

[0039] In a further optimized design, a support base 28 is hinged to the middle of the operating plate 27. The bottom end of the support base 28 is fixedly connected to the top end of the oil return chamber 22. A positioning rod 29 for positioning is hinged to the end of the operating plate 27 away from the control rod 26. The bottom end of the positioning rod 29 is hinged to the top end of the oil return chamber 22. The top end of the support base 28, which is fixed to the top end of the oil storage chamber 21, is hinged to the middle of the operating plate 27. One end of the operating plate 27 is connected to the control rod 26, and the other end is connected to the top end of the oil return chamber 22 through the positioning rod 29. At this time, the operating plate 27 forms a seesaw structure. When it is necessary to connect the oil storage chamber 21 and the oil return chamber 22, the end of the operating plate 27 corresponding to the positioning rod 29 is lifted, and the end of the operating plate 27 corresponding to the control rod 26 is lowered, pressing down on the control rod 26 and controlling the opening of the connecting block 25.

[0040] In one embodiment of this application, the positioning rod 29 includes a fixed cylinder hinged to the top of the oil return chamber 22. A movable rod is vertically mounted inside the fixed cylinder. The top end of the movable rod extends out of the fixed cylinder and is hinged to the bottom end of the operating plate 27. A locking nut is rotatably connected to the top end of the fixed cylinder. The locking nut can lock and release the fixed cylinder and the movable rod, which facilitates the control of the overall length of the positioning rod 29 and thus controls the angle of the operating plate 27.

[0041] In a further optimized design, a horizontally arranged transmission groove 210 is provided at the top of the control lever 26. A transmission rod 211 is slidably disposed within the transmission groove 210. Both ends of the transmission rod 211 extend out of the transmission groove 210 and are respectively fixedly connected to transmission plates 212. The top of the transmission plates 212 is fixedly connected to the operating plate 27. The transmission groove 210 is horizontally arranged, and the transmission rod 211 slides within it. Both ends of the transmission rod 211 extend out of the transmission groove 210 and are fixedly connected to the transmission plates 212. The top of the transmission plates 212 is fixedly connected to the end of the operating plate 27, thus converting the deflection of the operating plate 27 into the longitudinal lifting and lowering of the control lever 26.

[0042] In a further optimized design, several equally spaced extension plates 213 are fixed to the top side wall of the control lever 26. Several first return springs 214 in a compressed state are arranged between the bottom end of the extension plates 213 and the top end of the oil return chamber 22. The extension plates 213 are equally spaced and fixed to the outer wall of the control lever 26. The compressed return springs are supported between the oil return chamber 22 and the extension plates 213. When the control lever 26 is pressed down, the first return springs 214 are further compressed, opening the connecting block 25 and discharging the recovered fuel in the oil return chamber 22. When the operating plate 27 is released, the control lever 26 loses external force, the first return springs 214 return to their original position, pushing the control lever 26 up, closing the connecting block 25, and blocking the oil return chamber 22 and the oil storage chamber 21.

[0043] In one embodiment of this application, a second return spring 220 in a compressed state is provided between the bottom end of the control rod 26 and the bottom end of the oil return chamber 22. Its function is the same as that of the first return spring 214, which works together to push the control rod 26 to reset.

[0044] In one embodiment of this application, a connecting plate 219 is provided at the bottom of the side wall of the control rod 26, and the top end of the connecting rod 215 is fixedly connected to the connecting plate 219, so that the control rod 26 can apply force to the connecting rod 215 and control the raising and lowering of the connecting rod 215.

[0045] In a further optimized design, a connecting rod 215 is slidably connected to the connecting block 25. The connecting rod 215 is connected to the control rod 26 via a transmission. An oil guide channel 216 is provided inside the connecting rod 215. The top end of the oil guide channel 216 is connected to the return oil chamber 22 through several oil inlet holes 217. The bottom end of the oil guide channel 216 is connected to several oil outlet holes 218, which are connected to the oil storage chamber 21. The connecting rod 215 slides and seals on the connecting block 25. The oil guide channel 216 is arranged longitudinally on the connecting rod 215. Several strip-shaped oil inlet holes 217 are connected to the oil guide channel 216, so that the oil guide channel 216 and the return oil chamber 22 are always in a connected state within the lifting range of the connecting rod 215. The oil outlet hole 218 is connected to the bottom end of the oil guide channel 216. When the control rod 26 is not subjected to external force, the oil outlet hole 218 retracts into the connecting block 25 and is blocked, so the fuel in the return oil chamber 22 will not be discharged. When it is necessary to discharge the fuel in the return oil chamber 22, the control rod 26 presses down the connecting rod 215, so that the oil outlet hole 218 is dislodged from the connecting block 25, which can easily empty the fuel in the return oil chamber 22.

[0046] In a further optimized design, a baffle plate 221 is inclinedly installed inside the oil return chamber 22. The outlet of the oil return pipe 32 is located below the baffle plate 221. The mixture of fuel and inert gas ejected from the oil return pipe 32 impacts the baffle plate 221. The baffle plate 221 inside the oil return chamber 22 acts as a speed bump, reducing the flow velocity of the fuel and inert gas mixture ejected from the oil return pipe 32 and preventing it from directly impacting the wall of the oil return chamber 22 and causing damage. At the same time, it facilitates the separation of inert gas and fuel. The separated fuel falls, while the separated inert gas rises and is recovered from the recovery pipe 23.

[0047] In one embodiment of this application, an isolation net 223 corresponding to the recovery pipe 23 is provided in the recovery chamber. After the inert gas passes through the isolation net 223, it is discharged, effectively separating the gas mixed in with the inert gas.

[0048] In one embodiment of this application, the isolation net 223 is made of materials including but not limited to glass fiber, ceramic, nanofiber, metal, synthetic fiber, and automotive filter paper. Its function is common knowledge in the field. When selecting, factors such as specific application scenarios, performance requirements, and cost budget should be comprehensively considered to select the most suitable filter material.

[0049] In a further optimized design, an oil supply pump 33 is installed on the oil supply pipe 31. A first one-way valve 34 that opens in one direction toward the turbojet engine 5 is installed between the oil supply pump 33 and the turbojet engine 5. The connection points of the return oil pipe 32 and the cleaning pipe 41 with the oil supply pipe 31 are arranged sequentially in the direction toward the turbojet engine 5. A second one-way valve 35 that opens in one direction toward the return oil chamber 22 is installed on the return oil pipe 32, and a third one-way valve 42 that opens in one direction toward the oil supply pipe 31 is installed on the cleaning pipe 41. The fuel supply pump 33, acting as the power source for fuel supply, pumps fuel from the fuel reservoir 21 to the turbojet engine 5, providing fuel for engine operation. A first check valve 34 is installed between the outlet of the fuel supply pump 33 and the turbojet engine 5. The first check valve 34 allows fuel to be pumped to the turbojet engine 5, preventing fuel backflow during cleaning from affecting the fuel in the fuel reservoir 21. The return fuel pipe 32 is located on the side of the low-pressure check valve away from the fuel supply pump 33. When fuel in the fuel supply pipe 31 is backflowed, fuel flows back from the return fuel pipe 32 into the return fuel chamber 22. The second check valve 35 allows fuel to flow into the return fuel chamber 22, preventing backflow. The flow affects subsequent tests; the joint between the cleaning pipe 41 and the fuel supply pipe 31 is located between the return pipe 32 and the turbojet engine 5 and is closer to the turbojet engine 5. The third one-way valve 42 only allows inert gas to flow to the fuel supply pipe 31. The compressor 43 compresses and pressurizes the inert gas to clean the fuel pipe. The inert gas flows to both sides in the fuel pipe. One side blows the fuel back from the return pipe 32 to the return chamber 22, while the other side cleans the residual fuel in the turbojet engine 5, reducing the impact of residual fuel on the turbojet engine 5. At the same time, the high concentration of inert gas can also cool the turbojet engine 5, making disassembly convenient.

[0050] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A cleaning module, characterized in that, include: Cleaning gas cylinder (1), the cleaning gas cylinder (1) is used to store inert gas for cleaning; Fuel tank (2), the fuel tank (2) is divided into an oil storage chamber (21) and an oil return chamber (22), the oil storage chamber (21) and the oil return chamber (22) are connected by a communication component, and the top of the oil return chamber (22) recovers inert gas through a recovery pipe (23); Oil pipe assembly (3), the oil pipe assembly (3) includes an oil supply pipe (31) connecting the turbojet engine (5) and the oil storage chamber (21), and an oil return pipe (32) connecting the oil supply pipe (31) and the oil return chamber (22); The gas pipe assembly (4) includes a cleaning pipe (41) connecting the outlet of the cleaning gas cylinder (1) and the fuel supply pipe (31), wherein an inert gas backflushs the fuel in the fuel supply pipe (31) into the fuel return chamber (22) through the fuel return pipe (32).

2. The cleaning module according to claim 1, characterized in that: The communication component includes a communication hole (24) opened at the bottom end of the oil return chamber (22), and a communication block (25) that can be opened and closed is provided in the communication hole (24). The communication block (25) is connected to a control rod (26). The control rod (26) extends out of the oil return chamber (22) and is connected to the end of the operation plate (27) located at the top of the oil return chamber (22).

3. The cleaning module according to claim 2, characterized in that: A support base (28) is hinged to the middle of the operating plate (27), and the bottom end of the support base (28) is fixed to the top end of the oil return chamber (22). A positioning rod (29) for positioning is hinged to the end of the operating plate (27) away from the control rod (26), and the bottom end of the positioning rod (29) is hinged to the top end of the oil return chamber (22).

4. The cleaning module according to claim 2, characterized in that: The top of the control lever (26) is provided with a transversely arranged transmission groove (210), and a transmission rod (211) is slidably arranged in the transmission groove (210). Both ends of the transmission rod (211) extend out of the transmission groove (210) and are respectively fixedly connected to a transmission plate (212). The top of the transmission plate (212) is fixedly connected to the operation plate (27).

5. The cleaning module according to claim 2, characterized in that: The top sidewall of the control rod (26) is fixed with several equally spaced extension plates (213), and several first return springs (214) in a compressed state are provided between the bottom end of the extension plate (213) and the top end of the oil return chamber (22).

6. The cleaning module according to claim 2, characterized in that: A connecting rod (215) is slidably connected to the connecting block (25). The connecting rod (215) is connected to the control rod (26) in a transmission manner. An oil guide channel (216) is provided inside the connecting rod (215). The top end of the oil guide channel (216) is connected to the oil return chamber (22) through several oil inlet holes (217). The bottom end of the oil guide channel (216) is connected to several oil outlet holes (218). The oil outlet holes (218) are connected to the oil storage chamber (21).

7. The cleaning module according to claim 1, characterized in that: An inclined baffle plate (221) is provided inside the oil return chamber (22), and the outlet of the oil return pipe (32) is located below the baffle plate (221). The mixture of fuel oil and inert gas sprayed out from the oil return pipe (32) impacts the baffle plate (221).

8. The cleaning module according to claim 1, characterized in that: The oil supply pipe (31) is equipped with an oil supply pump (33), and a first one-way valve (34) that opens in one direction toward the turbojet engine (5) is provided between the oil supply pump (33) and the turbojet engine (5). The connection points of the return oil pipe (32) and the cleaning pipe (41) with the oil supply pipe (31) are arranged sequentially in the direction toward the turbojet engine (5).

9. The cleaning module according to claim 8, characterized in that: The return oil pipe (32) is provided with a second one-way valve (35) that opens to the return oil chamber (22) in one direction, and the cleaning pipe (41) is provided with a third one-way valve (42) that opens to the supply oil pipe (31) in one direction.

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