Gas-liquid mixed transportation supercharging equipment for compressor

Abstract

The invention discloses gas-liquid mixed transportation supercharging equipment for a compressor, and belongs to the technical field of supercharging equipment, the gas-liquid mixed transportation supercharging equipment comprises a gas-liquid supercharging cylinder, a power cavity is arranged in the gas-liquid supercharging cylinder, oil change ports are arranged on the power cavity and located on two sides of a driving piston, and supercharging cavities are arranged on the gas-liquid supercharging cylinder and located on two ends of the power cavity. A sealing block is arranged between the pressurizing cavity and the power cavity; a driving piston is slidably connected into the power cavity. A driven piston is slidably connected into the pressurizing cavity; by controlling the reversing valve group, flexible switching of the oil flow direction is achieved, bidirectional movement of the driving piston can be achieved without a complex mechanical structure, the system structure is simplified, the manufacturing cost is reduced, the reliability of equipment is improved, and the response speed of the equipment is increased. Meanwhile, by means of high efficiency and stability of hydraulic transmission, stable operation of the driven piston in the pressurizing cavity is guaranteed, and stable and efficient work of the whole hydraulic system is guaranteed.

Description

Technical Field

[0001] The invention relates to a gas-liquid mixed transmission boosting device for a compressor, belonging to the technical field of boosting equipment. Background Art

[0002] In the field of low-carbon oil extraction, there is an urgent need for efficient, stable, and cost-effective extraction equipment. Traditional hydraulic systems often rely on complex mechanical structures to switch the direction of oil flow to achieve bidirectional piston motion to drive related extraction operations. This not only results in complex system construction and high manufacturing costs, but also increases equipment failure rates during operation, significantly compromising reliability and response speed, making it difficult to meet the requirements of high-efficiency and stable operation required by low-carbon oil extraction. Furthermore, during the transmission and pressurization of gas and liquid media, traditional sealing methods struggle to balance the requirements of smooth medium circulation and backflow prevention. The resulting poor sealing performance makes it prone to medium leakage, affecting the reliability of the pressurization process and, in turn, the stability and efficiency of the entire extraction system. Furthermore, the lack of effective seal reinforcement makes it difficult for the equipment to operate stably and for long periods of time under complex operating conditions, making it inadequately adaptable to the diverse operating environments of low-carbon oil extraction. Therefore, a gas-liquid mixed transmission and pressurization device for compressors is proposed. Summary of the Invention

[0003] In response to the above-mentioned technical deficiencies, the purpose of the present invention is to provide a gas-liquid mixed transmission boosting equipment for a compressor, which utilizes the high efficiency and stability of hydraulic transmission to ensure the smooth operation of the driven piston in the boosting chamber, providing a strong guarantee for the stable and efficient operation of the entire hydraulic system.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a gas-liquid mixed transmission and boosting device for a compressor, comprising: A gas-liquid booster cylinder, wherein a power chamber is provided in the gas-liquid booster cylinder, and an oil change port connected to the power chamber is provided on both sides of the active piston sliding stroke. A booster chamber is provided on the gas-liquid booster cylinder at both ends of the power chamber, and a sealing block is provided between the booster chamber and the power chamber; An active piston is slidably connected in the power chamber; A driven piston is slidably connected in the pressurizing chamber; When the active piston slides in the power chamber, the active piston drives the driven piston to slide in the boost chamber; Among them, base blocks are fixed on the gas-liquid booster cylinder and at both ends of the boosting chamber. The base blocks are connected with an injection pipe and a discharge pipe. The injection pipe and the discharge pipe are connected to the boosting chamber through separate one-way valve groups respectively. The injection pipe is used to inject the gas-liquid medium into the boosting chamber in one direction, and the discharge pipe is used to discharge the gas-liquid medium in the boosting chamber in one direction.

[0005] Preferably, two valve slots are provided in the base block, both valve slots are connected to the pressurizing chamber, and the two valve slots are connected to the injection pipe and the discharge pipe respectively, and the one-way valve group is installed in the valve slot.

[0006] Preferably, the one-way valve group includes: A sliding frame, wherein the sliding frame is slidably connected to the interior of the valve slot via a spring; A movable sealing member, the movable sealing member is fixed on the sliding frame, and the movable sealing member is provided with a first sealing wall; a fixed sealing member, the fixed sealing member being fixed in the valve groove and provided with a second sealing wall; Under the pressure of the spring, the first sealing wall presses against the second sealing wall.

[0007] Preferably, the cross section of the second sealing wall is arc-shaped, and the shape of the first sealing wall matches the shape of the second sealing wall; Wherein, a groove is provided in the middle of the second sealing wall, and a convex ring is provided on the first sealing wall; When the first sealing wall abuts against the second sealing wall, the protruding ring abuts against the inside of the groove.

[0008] Preferably, an air chamber is provided inside the movable sealing component, an elastic membrane is provided at the lower end of the air chamber, and a support ring plate is provided on one side wall of the air chamber close to the first sealing wall.

[0009] Preferably, a top plate is fixed on the inner wall of the elastic membrane, a support ring block is fixed inside the convex ring, and a plurality of V-shaped top sheets are distributed circumferentially on the support ring plate, one end of the V-shaped top sheet is fixed on the support ring plate, the other end of the V-shaped top sheet is tightly pressed against the support ring block, and the middle part of the V-shaped top sheet is pressed against the top plate.

[0010] Preferably, a retaining frame is provided on a side of the movable sealing member away from the first sealing wall.

[0011] Preferably, a plurality of liquid guide holes are evenly distributed on the side wall of the sliding frame.

[0012] Preferably, it also includes a hydraulic oil tank, a motor oil pump and a reversing valve group; The reversing valve group is provided with two first oil pipes, which are respectively connected to the two oil change ports. The reversing valve group is provided with a second oil pipe and a third oil pipe connected to the hydraulic oil tank, and the motor oil pump is connected to the second oil pipes. When the motor oil pump is running, the motor oil pump absorbs the oil in the hydraulic oil tank and injects it into the reversing valve group through the second oil pipe.

[0013] Preferably, the third oil pipe is further provided with a hydraulic air-cooling radiator for cooling the oil flowing back into the hydraulic oil tank.

[0014] Compared with existing technologies: 1. This invention achieves flexible switching of oil flow direction by controlling the reversing valve group, achieving bidirectional motion of the active piston without complex mechanical structures. This not only simplifies the system structure and reduces manufacturing costs, but also improves the reliability and response speed of the equipment. At the same time, the high efficiency and stability of hydraulic transmission ensures the smooth operation of the driven piston within the boost chamber, providing a strong guarantee for the stable and efficient operation of the entire hydraulic system.

[0015] 2. The present invention utilizes spring pressure to achieve dynamic sealing between the movable and fixed seals. When the flow direction of the gas-liquid medium is opposite to the direction of the spring pressure, the medium can push against the seal to allow flow, ensuring smooth circulation of the medium within the pressurization chamber. When the flow directions are the same, the seal fits tightly, effectively preventing backflow of the medium and ensuring the reliability of the pressurization process. Furthermore, the curved design of the second sealing wall, the matching shape of the first sealing wall, and the coordination between the raised ring and the groove further enhance the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is an overall cross-sectional view of the present invention.

[0018] Figure 3 It is a cross-sectional view of the base block, valve slot, spring and sliding frame of the present invention.

[0019] Figure 4 For the present invention Figure 3 Enlarged view of point A.

[0020] Figure 5 It is a cross-sectional exploded view of the base block, valve slot, spring and sliding frame of the present invention.

[0021] Figure 6 For the present invention Figure 5 Enlarged view of point B.

[0022] Figure 7 This is a cross-sectional view of the first sealing wall and the second sealing wall when separated from each other.

[0023] Figure 8 It is a cross-sectional exploded view of the sliding frame, movable seal and retaining frame of the present invention.

[0024] Figure 9 It is a structural schematic diagram of the top plate, support ring plate and V-shaped top plate of the present invention.

[0025] Figure 10 It is a process flow chart of the present invention.

[0026] In the picture: 1. Gas-liquid booster cylinder; 101, power chamber, 102, boost chamber, 103, sealing block, 104, oil change port; 2. Active piston, 3. Driven piston, 4. Connecting rod; 5. Base block, 501. Injection pipe, 502. Discharge pipe, 503. Valve slot; 6. One-way valve group; 601, sliding frame, 6011, liquid guide hole, 602, spring; 603, movable sealing member, 6031, first sealing wall, 6032, convex ring, 6033, air chamber; 604, fixed seal, 6041, second sealing wall, 6042, groove; 605, retainer, 606, elastic membrane, 607, top plate, 608, support ring plate, 6081, V-shaped top plate, 609, support ring block; 7. Hydraulic oil tank, 8. Motor oil pump, 9. Reversing valve group; 10. First oil pipe, 11. Second oil pipe, 12. Third oil pipe; 13. Hydraulic air-cooled radiator, 14. Explosion-proof electrical pipe; 15. Infusion catheter, 16. Drainage catheter. DETAILED DESCRIPTION

[0027] The present invention is described below with specific examples, but is not intended to be limiting of the invention.

[0028] Example 1 like Figures 1-10 As shown, in this embodiment, a gas-liquid mixed transmission boosting device for a compressor is provided, including a gas-liquid boosting cylinder 1, a power chamber 101 is provided in the gas-liquid boosting cylinder 1, and an oil change port 104 connected to the power chamber 101 is provided on both sides of the sliding stroke of the active piston 2 on the power chamber 101. A boosting chamber 102 is provided on the gas-liquid boosting cylinder 1 and at both ends of the power chamber 101, and a sealing block 103 is provided between the boosting chamber 102 and the power chamber 101; the active piston 2 is slidably connected to the power chamber 101; like Figure 2 and Figure 10 As shown, oil change ports 104 are provided on the power chamber 101 and on both sides of the active piston 2. The gas-liquid mixed transmission and boosting equipment for the compressor also includes: a hydraulic oil tank 7, a motor oil pump 8 and a reversing valve group 9. like Figure 2As shown, the power chamber 101 is divided into chamber a and chamber b by the active piston 2. Two oil exchange ports 104 are respectively connected to chamber a and chamber b. Two first oil pipes 10 are provided on the reversing valve group 9. The two first oil pipes 10 are respectively connected to the two oil exchange ports 104. The reversing valve group 9 is provided with a second oil pipe 11 and a third oil pipe 12 connected to the hydraulic oil tank 7. The motor oil pump 8 is connected to the second oil pipe 11. When the motor oil pump 8 is running, the motor oil pump 8 draws the oil in the hydraulic oil tank 7 and injects it into the reversing valve group 9 through the second oil pipe 11. The third oil pipe 12 returns the oil to the hydraulic oil tank 7. In addition, a hydraulic air-cooling radiator 13 is provided on the third oil pipe 12 between the hydraulic oil tank 7 and the reversing valve group 9. The hydraulic air-cooling radiator 13 is used to cool the oil returning to the hydraulic oil tank 7. The device is also provided with an explosion-proof electrical pipe 14. The working process is: Process 1: Inject oil into chamber a to cause the active piston 2 to slide rightward in the power chamber 101; The reversing valve group 9 is operated to connect the first oil pipe 10 connected to the a chamber with the second oil pipe 11, and to connect the first oil pipe 10 connected to the b chamber with the third oil pipe 12. After the motor oil pump 8 is operated, the oil in the hydraulic oil tank 7 is injected into the a chamber along the second oil pipe 11 and the corresponding first oil pipe 10, while the oil in the b chamber flows back into the hydraulic oil tank 7 along the corresponding first oil pipe 10 and the third oil pipe 12. At this time, the active piston 2 slides rightward in the power chamber 101. Process 2: Inject oil into chamber b to cause the active piston 2 to slide leftward in the power chamber 101; The reversing valve group 9 is operated to connect the first oil pipe 10 connected to the b chamber with the second oil pipe 11, and the first oil pipe 10 connected to the a chamber with the third oil pipe 12. After the motor oil pump 8 is operated, the oil in the hydraulic oil tank 7 is injected into the b chamber along the second oil pipe 11 and the corresponding first oil pipe 10, while the oil in the a chamber flows back into the hydraulic oil tank 7 along the corresponding first oil pipe 10 and the third oil pipe 12. At this time, the active piston 2 slides to the left in the power chamber 101. The boost chamber 102 is slidably connected to the driven piston 3. like Figure 2 As shown, both ends of the active piston 2 are fixedly connected to a connecting rod 4, and the ends of the two connecting rods 4 respectively pass through the sealing block 103 on the same side and extend into the pressurizing chamber 102 and are connected to the corresponding driven piston 3; When the active piston 2 slides in the power chamber 101, the active piston 2 drives the slave piston 3 to slide in the boost chamber 102. The active piston 2 passes through the sealing block 103 on the same side through the connecting rod 4 fixed at both ends and is connected to the corresponding slave piston 3. Therefore, the movement of the active piston 2 drives the movement of the slave piston 3 through the connecting rod 4. Among them, a base block 5 is fixed on the gas-liquid booster cylinder 1 and at both ends of the booster chamber 102, and an injection pipe 501 and a discharge pipe 502 are connected to the base block 5. The injection pipe 501 and the discharge pipe 502 are connected to the booster chamber 102 through separate one-way valve groups 6 respectively. The injection pipe 501 is used to inject the gas-liquid medium into the booster chamber 102 in one direction, and the discharge pipe 502 is used to discharge the gas-liquid medium in the booster chamber 102 in one direction.

[0029] Example 2 like Figure 2-Figure 8 As shown, based on the first embodiment, in this embodiment, two valve slots 503 are provided in the base block 5, both valve slots 503 are connected to the pressurizing chamber 102, and the two valve slots 503 are connected to the injection pipe 501 and the discharge pipe 502 respectively, and the one-way valve group 6 is installed in the valve slot 503. Figure 10 As shown, since there are multiple base blocks 5, there are multiple injection pipes 501 and discharge pipes 502. In addition, the gas-liquid mixed transmission and boosting equipment for the compressor is also provided with an injection conduit 15 for introducing the gas-liquid medium into the injection pipe 501 and a discharge conduit 16 for discharging the gas-liquid medium in the discharge pipe 502. Multiple injection pipes 501 are connected in parallel to the injection conduit 15, and multiple discharge pipes 502 are connected in parallel to the discharge conduit 16.

[0030] The one-way valve assembly 6 includes a sliding frame 601, which is slidably connected to the interior of the valve spool 503 via a spring 602. A plurality of liquid guide holes 6011 are evenly distributed on the sidewall of the sliding frame 601. A movable seal 603 is fixed to the sliding frame 601, and a first sealing wall 6031 is provided on the movable seal 603. A fixed seal 604 is fixed in the valve spool 503, and a second sealing wall 6041 is provided on the fixed seal 604. Under the pressure of spring 602, the first sealing wall 6031 of the movable seal 603 typically remains pressed against the second sealing wall 6041 of the fixed seal 604, preventing the flow of medium. When the medium pressure acts on the movable seal 603, the force generated is sufficient to overcome the elastic force of spring 602, and the movable seal 603 is pushed, separating the first sealing wall 6031 from the second sealing wall 6041, allowing the medium to flow through the liquid guide hole 6011 and the separated sealing surfaces.

[0031] The cross section of the second sealing wall 6041 is arc-shaped, and the shape of the first sealing wall 6031 matches the shape of the second sealing wall 6041. A groove 6042 is provided in the middle of the second sealing wall 6041, and a convex ring 6032 is provided on the first sealing wall 6031. When the first sealing wall 6031 abuts against the second sealing wall 6041 , the protruding ring 6032 abuts against the inside of the groove 6042 .

[0032] For a boost chamber 102, the slave piston 3 divides the boost chamber 102 into a rod chamber and a rodless chamber. The rod chamber and the rodless chamber correspond to an injection pipe 501 and an exhaust pipe 502 on a base block 5, respectively. When the active piston 2 drives the slave piston 3 to slide via the connecting rod 4, the rod chamber and the rodless chamber increase and decrease relatively. Operation process: Combine Figure 2 When the active piston 2 drives the driven piston 3 to move leftward, in the left boosting chamber 102, the rodless chamber decreases and the rod chamber increases. At this time, the gas-liquid medium in the rodless chamber is squeezed, and the gas-liquid medium in the rodless chamber pushes open the corresponding one-way valve group 6 to discharge the gas-liquid medium from the discharge pipe 502. Conversely, the rod chamber increases, and the gas-liquid medium can be sucked in through the corresponding injection pipe 501. In the right boost chamber 102, the rodless chamber is enlarged and the rod chamber is reduced. In this way, the rodless chamber uses the corresponding injection pipe 501 to absorb the gas-liquid medium, and the gas-liquid medium in the rod chamber pushes open the corresponding one-way valve group 6 to discharge the gas-liquid medium from the discharge pipe 502. Similarly, when the active piston 2 drives the driven piston 3 to move rightward, in the left boosting chamber 102, the rodless chamber increases to inhale the gas-liquid medium, and the rod chamber decreases to discharge the gas-liquid medium; in the right boosting chamber 102, the rodless chamber decreases to discharge the gas-liquid medium, and the rod chamber increases to inhale the gas-liquid medium; From the above, it can be seen that the rodless chamber of the left boost chamber 102 and the rod chamber of the right boost chamber 102 synchronously inhale or discharge gas-liquid medium, and the rod chamber of the left boost chamber 102 and the rodless chamber of the right boost chamber 102 synchronously inhale or discharge gas-liquid medium.

[0033] Example 3 like Figure 2-Figure 9 As shown, based on the second embodiment, in this embodiment, an air chamber 6033 is opened inside the movable sealing member 603, an elastic membrane 606 is provided at the lower end of the air chamber 6033, and a support ring plate 608 is provided on one side wall of the air chamber 6033 close to the first sealing wall 6031.

[0034] A top plate 607 is fixed on the inner wall of the elastic membrane 606, a support ring block 609 is fixed inside the convex ring 6032, and multiple V-shaped top plates 6081 are distributed circumferentially on the support ring plate 608. One end of the V-shaped top plate 6081 is fixed on the support ring plate 608, and the other end of the V-shaped top plate 6081 is tightly pressed against the support ring block 609, and the middle part of the V-shaped top plate 6081 is pressed against the top plate 607.

[0035] The air chamber 6033 and the elastic membrane 606 convert the medium pressure into a sealing enhancement force: the higher the pressure, the greater the deformation of the elastic membrane 606, the stronger the leverage effect of the V-shaped top plate 6081, and the greater the radial pressing force of the convex ring 6032 on the groove 6042, thereby achieving dynamic pressure self-compensation sealing and completely solving the leakage problem under high-pressure working conditions.

[0036] A retaining frame 605 is provided on the side of the movable seal 603 away from the first sealing wall 6031. The retaining frame 605 is attached to the movable seal 603 to support the movable seal 603 and prevent the movable seal 603 from deformation. During installation, the retaining frame 605 is attached to the movable seal 603, and then the movable seal 603 and the retaining frame 605 are fixed to the sliding frame 601 with bolts. When the first sealing wall 6031 is against the second sealing wall 6041, the retaining frame 605 supports the movable seal 603, thereby ensuring the stability of the seal between the first sealing wall 6031 and the second sealing wall 6041.

[0037] Through the coordination of the pressure response system of the air chamber 6033 and the elastic membrane 606 and the lever mechanism of the V-shaped top plate 6081, the sealing force is dynamically enhanced with the medium pressure, improving the sealing reliability under high pressure and pulsating flow conditions; the retainer 605 structure further ensures the rigidity of the seal and extends its life.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A gas-liquid mixed transmission boosting equipment for a compressor, characterized in that: include: A gas-liquid booster cylinder (1), wherein a power chamber (101) is provided in the gas-liquid booster cylinder (1), and an oil change port (104) communicating with the power chamber (101) is provided on both sides of the sliding stroke of the active piston (2). A booster chamber (102) is provided on the gas-liquid booster cylinder (1) and at both ends of the power chamber (101), and a sealing block (103) is provided between the booster chamber (102) and the power chamber (101); An active piston (2) is slidably connected in the power chamber (101); A driven piston (3) is slidably connected in the pressurizing chamber (102); When the active piston (2) slides in the power chamber (101), the active piston (2) drives the driven piston (3) to slide in the boost chamber (102); Wherein, base blocks (5) are fixed on the gas-liquid boosting cylinder (1) and at both ends of the boosting chamber (102), and an injection pipe (501) and a discharge pipe (502) are connected to the base block (5), and the injection pipe (501) and the discharge pipe (502) are respectively connected to the boosting chamber (102) through separate one-way valve groups (6). The injection pipe (501) is used to inject the gas-liquid medium into the boosting chamber (102) in a one-way manner, and the discharge pipe (502) is used to discharge the gas-liquid medium in the boosting chamber (102) in a one-way manner.

2. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 1, characterized in that: Two valve slots (503) are provided in the base block (5), both valve slots (503) are in communication with the boost chamber (102), and the two valve slots (503) are in communication with the injection pipe (501) and the discharge pipe (502), respectively. The one-way valve group (6) is installed in the valve slot (503).

3. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 2, characterized in that: The one-way valve group (6) includes: A sliding frame (601), wherein the sliding frame (601) is slidably connected to the interior of the valve slot (503) via a spring (602); A movable sealing member (603), the movable sealing member (603) being fixed on the sliding frame (601), and the movable sealing member (603) being provided with a first sealing wall (6031); A fixed sealing member (604), the fixed sealing member (604) being fixed in the valve groove (503), and a second sealing wall (6041) being provided on the fixed sealing member (604); Under the pressure of the spring (602), the first sealing wall (6031) is pressed against the second sealing wall (6041).

4. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 3, characterized in that: The cross-section of the second sealing wall (6041) is arc-shaped, and the shape of the first sealing wall (6031) is adapted to the shape of the second sealing wall (6041); A groove (6042) is provided in the middle of the second sealing wall (6041), and a convex ring (6032) is provided on the first sealing wall (6031); When the first sealing wall (6031) abuts against the second sealing wall (6041), the protruding ring (6032) abuts against the inside of the groove (6042).

5. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 4, characterized in that: An air chamber (6033) is provided inside the movable sealing member (603), an elastic membrane (606) is provided at the lower end of the air chamber (6033), and a support ring plate (608) is provided on one side wall of the air chamber (6033) close to the first sealing wall (6031).

6. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 5, characterized in that: A top plate (607) is fixed on the inner wall of the elastic membrane (606), a support ring block (609) is fixed inside the convex ring (6032), and a plurality of V-shaped top sheets (6081) are distributed circumferentially on the support ring plate (608), one end of the V-shaped top sheet (6081) is fixed on the support ring plate (608), the other end of the V-shaped top sheet (6081) is pressed against the support ring block (609), and the middle part of the V-shaped top sheet (6081) is pressed against the top plate (607).

7. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 3, characterized in that: A retaining frame (605) is provided on a side of the movable sealing member (603) away from the first sealing wall (6031).

8. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 3, characterized in that: A plurality of liquid guide holes (6011) are evenly distributed on the side wall of the sliding frame (601).

9. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 1, characterized in that: It also includes a hydraulic oil tank (7), a motor oil pump (8) and a reversing valve group (9); The reversing valve group (9) is provided with two first oil pipes (10), the two first oil pipes (10) are respectively connected to the two oil change ports (104), the reversing valve group (9) is provided with a second oil pipe (11) and a third oil pipe (12) connected to the hydraulic oil tank (7), and the motor oil pump (8) is connected to the second oil pipe (11); When the motor oil pump (8) is running, the motor oil pump (8) absorbs the oil in the hydraulic oil tank (7) and injects it into the reversing valve group (9) through the second oil pipe (11).

10. The gas-liquid mixed transmission and boosting equipment for a compressor according to claim 9, characterized in that: The third oil pipe (12) is also provided with a hydraulic air-cooling radiator (13) for cooling the oil flowing back into the hydraulic oil tank (7).

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