Oil tank for a hydraulic station

Abstract

The utility model provides a kind of oil tank for hydraulic station, including body and the cover for body;First baffle and second baffle are arranged in body interior;By first baffle and second baffle, body is divided into oil return cavity, sediment cavity and oil supply cavity;First baffle is provided with first through-hole, and second baffle is provided with second through-hole;Oil return filter device one end passes through the lateral wall of body and is placed in oil return cavity;Oil return pipe is set on the inner wall of body, one end is connected with oil return filter device, the other end is set on first baffle;And a plurality of oil outlets are opened on oil return pipe, and the opening direction of oil outlet is opposite to the position where first baffle is located;The oil tank for hydraulic station proposed in the utility model can reduce turbulence and vortex generation, thereby reducing the amount of bubble mixing, avoiding the risk of hydraulic pump cavitation, stabilizing system pressure, and improving the action accuracy of the actuator.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic station technology, and in particular to an oil tank for a hydraulic station. Background Technology

[0002] In hydraulic systems, the oil tank is not only a core component for storing hydraulic fluid, but also a crucial link in ensuring stable oil flow and providing clean, bubble-free oil to the hydraulic pump. However, traditional hydraulic power unit oil tanks generally suffer from the core problem of disordered oil mixing when handling return oil, which directly affects the system's operational stability and component lifespan.

[0003] In existing technologies, most oil tanks are single-chamber structures or simply have baffles without optimizing the return oil guidance path. After the hydraulic system starts working, the high-temperature return oil is directly discharged into the oil tank through pipelines, with a return oil flow rate of 3-5 m / s. The high-speed oil directly impacts the static oil in the tank, easily forming severe turbulence and vortices. This impact causes a large amount of air to be mixed into the oil, forming bubbles with a diameter of 0.1-1 mm. These bubbles, after circulating with the oil into the hydraulic pump, can cause "cavitation," resulting in internal wear of the pump body and causing system pressure fluctuations, reducing the operating accuracy of actuators (such as cylinders and hydraulic motors). On the other hand, the high-speed return oil disrupts the natural stratification of the oil in the tank, re-entraining the small impurities (such as metal fragments and sealing residues) that have already settled, and recirculating them with the oil, exacerbating the risk of valve jamming, pump head wear, and other malfunctions.

[0004] Although existing technologies have attempted to add simple bends to guide the flow at the return port, turbulence cannot be avoided. Another solution uses a large-capacity oil tank to try to reduce the degree of turbulence through "expansion buffering," but this results in an increase in equipment size, making it unsuitable for space-constrained scenarios (such as skid-mounted hydraulic stations and containerized equipment). Utility Model Content

[0005] The purpose of this utility model is to provide an oil tank for a hydraulic power station, which can solve the above-mentioned technical problems;

[0006] This utility model provides an oil tank for a hydraulic power station, comprising:

[0007] The main body and the cover used for the main body;

[0008] The first and second partitions are disposed inside the main body; the main body is divided into an oil return chamber, a sedimentation chamber and an oil supply chamber by the first and second partitions;

[0009] The first partition is provided with a first through hole, and the second partition is provided with a second through hole. The oil return chamber is connected to the sedimentation chamber through the first through hole, and the sedimentation chamber is connected to the oil supply chamber through the second through hole.

[0010] The oil return filter device has one end inserted through the side wall of the main body and placed inside the oil return chamber;

[0011] The oil return pipe is located on the inner wall of the main body, with one end connected to the oil return filter device and the other end located on the first partition plate; and several oil outlet holes are opened on the oil return pipe, with the opening direction of the oil outlet holes opposite to the location of the first partition plate.

[0012] As a further technical solution, it also includes: several temperature sensors, one end of which passes through the cover and is placed inside the body.

[0013] As a further technical solution, it also includes: several level gauges, one end of which passes through the cover and is placed inside the body.

[0014] As a further technical solution, it also includes: a vent valve, one end of which passes through the cover and is connected to the oil return pipe.

[0015] As a further technical solution, a sedimentation port is provided at the bottom of the sedimentation chamber; a sedimentation box is provided on the outside of the main body, and the sedimentation box is connected to the sedimentation port.

[0016] As a further technical solution, it also includes: an oil suction filter, which is installed on the second partition and connected to the hydraulic pump through a pipeline.

[0017] As a further technical solution, it also includes: a guide plate for guiding the oil in the oil supply chamber into the oil suction filter, which is set on the second partition and placed inside the oil supply chamber.

[0018] As a further technical solution, it also includes: several heat dissipation fins, which are disposed on the outer wall of the main body adjacent to the oil supply chamber.

[0019] As a further technical solution, it also includes: a heat dissipation shell, which is disposed on the outer wall of the main body and has several heat dissipation fins placed inside; the heat dissipation shell is provided with an exhaust device for increasing the airflow inside the heat dissipation shell.

[0020] As a further technical solution, a heat dissipation pipe is installed on the outer wall of the main body adjacent to the oil return chamber.

[0021] The technical solution of this utility model divides the inside of the oil tank into a return oil chamber, a sedimentation chamber, and an oil supply chamber through a first partition and a second partition, forming an orderly flow path and avoiding disordered oil mixing caused by a single chamber or simple partition. The opening direction of the oil outlet of the return oil pipe is opposite to that of the first partition, so that the return oil flows out smoothly away from the partition. Combined with the pre-filtration of the return oil filter device, the impact of high-speed return oil of 3-5m / s on the static oil is greatly reduced, the generation of turbulence and vortex is reduced, thereby reducing the amount of air bubbles mixed in, avoiding the risk of hydraulic pump cavitation, stabilizing system pressure, and improving the action accuracy of the actuator.

[0022] In addition, the partitioned structure, combined with orderly oil flow, allows impurities in the return oil to first settle in the return oil chamber and then settle again in the sedimentation chamber, preventing high-speed return oil from stirring up the already settled impurities. At the same time, the return oil filter device filters some impurities in advance, further reducing the probability of impurities entering the oil supply chamber, reducing valve jamming, pump head wear and other failures, and extending the life of hydraulic components.

[0023] Meanwhile, the technical solution of this utility model does not require increasing the oil tank volume to alleviate oil turbulence. Instead, it optimizes oil flow through internal structural design, ensuring buffering and sedimentation effects while controlling the overall volume of the oil tank, thereby improving the overall applicability. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a perspective view of an oil tank for a hydraulic station according to the present invention.

[0026] Figure 2 This is a perspective view of an oil tank for a hydraulic station according to the present invention from another angle;

[0027] Figure 3 This is a perspective view of the internal structure of an oil tank for a hydraulic station according to the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of an oil tank for a hydraulic station according to the present invention;

[0029] Figure 5 for Figure 4 A cross-sectional view along the AA direction.

[0030] Explanation of reference numerals in the attached figures:

[0031] 101-Body; 102-Cover; 201-First partition; 211-First through hole; 202-Second partition; 221-Second through hole; 301-Oil return chamber; 302-Sedimentation chamber; 321-Sedimentation port; 322-Sedimentation box; 303-Oil supply chamber; 401-Oil return filter; 402-Oil return pipe; 421-Vent valve; 403-Oil outlet; 501-Temperature sensor; 502-Level gauge; 601-Oil suction filter; 602-Guide plate; 701-Heat dissipation fins; 702-Heat dissipation shell; 703-Exhaust device; 800-Heat dissipation pipe. Detailed Implementation

[0032] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] like Figure 1-2 As shown, the present invention proposes an oil tank for a hydraulic station, comprising:

[0036] The body 101 and the cover 102 for the body 101 are provided. Several support legs are provided at the bottom of the body 101, and threaded holes are provided on the support legs. The support legs can be connected to the base of the hydraulic station by bolts. Preferably, one support leg is provided at each of the four corners of the body 101. The cover 102 is fastened to the body 101 in a sealed state, and an oil-resistant nitrile rubber sealing ring is provided at the connection between the cover 102 and the body 101 to seal the connection between the body 101 and the cover 102. Preferably, the cover 102 and the body 101 are connected by bolts.

[0037] A first partition 201 and a second partition 202 are disposed inside the main body 101; the first partition 201 and the second partition 202 divide the interior of the main body 101 into an oil return chamber 301, a sedimentation chamber 302 and an oil supply chamber 303; a first through hole 211 is provided on the first partition 201 and a second through hole 221 is provided on the second partition 202, the oil return chamber 301 and the sedimentation chamber 302 are connected through the first through hole 211, and the sedimentation chamber 302 and the oil supply chamber are connected through the second through hole 221. 303 is connected; one end of the return oil filter device 401 passes through the side wall of the main body 101 and is placed in the return oil chamber 301, and the other end is connected to the return oil port of the hydraulic system in the prior art through a pipe; the return oil pipe 402 is set on the inner wall of the main body 101, one end is connected to the return oil filter device 401, and the other end is set on the first partition 201; and a plurality of oil outlet holes 403 are opened on the return oil pipe 402, and the opening direction of the oil outlet holes 403 is opposite to the position of the first partition 201; such as Figure 3 As shown, a mounting plate is provided on the first partition 201, and a buckle is provided on the mounting plate. The other end of the return oil pipe 402 is placed on the mounting plate and fixed by the buckle to ensure that the position of the return oil pipe 402 is stable. The preferred return oil filter device 401 is a return oil filter, model RFA-400×10-LY.

[0038] The hydraulic fluid in the hydraulic system enters the return oil filter device 401 through the pipeline, where it is filtered. The filtered oil then enters the return oil pipe 402 and is discharged through several outlet holes 403 after being transported within the return oil pipe 402. After entering the return oil chamber 301, the oil enters the sedimentation chamber 302 through the first through hole 211, where it settles, causing impurities in the oil to settle. The oil then enters the supply oil chamber 303 through the second through hole 221 and is transported to the hydraulic pump for use through the pipeline placed in the supply oil chamber 303.

[0039] In addition, in this invention, the distance between the second through hole 221 and the bottom surface of the body 101 is greater than the distance between the first through hole 211 and the bottom surface, so that a specific oil storage height is formed in the sedimentation chamber 302. Impurities settle at the bottom of the sedimentation chamber 302 under their own gravity. When the oil supply chamber 303 supplies oil to the hydraulic pump, the oil in the sedimentation chamber 302 enters the oil supply chamber 303 through the second through hole 221. Since the second through hole 221 is higher than the bottom of the sedimentation chamber 302, the clean oil that is flush with the second through hole 221 will flow in preferentially, while the impurities at the bottom of the sedimentation chamber 302 cannot enter due to the height difference, thereby reducing the probability of impurities entering the oil supply chamber 303.

[0040] The technical solution of this utility model divides the inside of the oil tank into a return oil chamber 301, a sedimentation chamber 302, and an oil supply chamber 303 through a first partition 201 and a second partition 202, forming an orderly flow path and avoiding disordered oil mixing caused by a single chamber or simple partition. The opening direction of the oil outlet 403 of the return oil pipe 402 is opposite to that of the first partition 201, so that the return oil flows out smoothly away from the partition. Combined with the pre-filtration of the return oil filter device 401, the impact of high-speed return oil of 3-5m / s on the static oil is greatly reduced, the generation of turbulence and vortex is reduced, thereby reducing the amount of air bubbles mixed in, avoiding the risk of hydraulic pump cavitation, stabilizing system pressure, and improving the action accuracy of actuators.

[0041] In addition, the partitioned structure, combined with orderly oil flow, allows impurities in the return oil to first settle in the return oil chamber 301, and then settle again in the sedimentation chamber 302, preventing high-speed return oil from stirring up the settled impurities. At the same time, the return oil filter device 401 filters some impurities in advance, further reducing the probability of impurities entering the oil supply chamber 303, reducing valve jamming, pump head wear and other failures, and extending the life of hydraulic components.

[0042] Meanwhile, the technical solution of this utility model does not require increasing the oil tank volume to alleviate oil turbulence. Instead, it optimizes oil flow through internal structural design, ensuring buffering and sedimentation effects while controlling the overall volume of the oil tank, thereby improving the overall applicability.

[0043] like Figure 1-2 As shown, this utility model also includes several temperature sensors 501, one end of which passes through the cover 102 and is placed inside the main body 101. These temperature sensors 501 are connected to the controller of the hydraulic station (such as a Siemens S7-200SMART series PLC controller in the prior art), and the temperature inside the main body 101 is detected by the temperature sensors 501. Specifically, two temperature sensors 501 are provided, defined as the first sensor and the second sensor. The first sensor is placed inside the return oil chamber 301, and the second sensor is placed inside the supply oil chamber 303. Both sensors detect the temperature of the oil in the return oil chamber 301 and the supply oil chamber 303 respectively, and send the detected signals to the controller. The controller then obtains the real-time temperature information of the return oil chamber 301 and the supply oil chamber 303.

[0044] In addition, this utility model also includes several level gauges 502, one end of which passes through the cover 102 and is placed inside the main body 101; preferably, two level gauges 502 are provided, defined as a first detection body and a second detection body respectively; wherein the first detection body is inserted into the return oil chamber 301, and the second detection body is inserted into the supply oil chamber 303, and both are connected to the controller of the hydraulic station; the first detection body and the second detection body respectively detect the liquid level in the return oil chamber 301 and the supply oil chamber 303, and send the detected data to the controller; when the first detection body or the second detection body detects that the oil level has reached the upper limit, the controller triggers an audible and visual alarm to prevent excessive oil from overflowing the main body 101 in the return oil chamber 301 or the supply oil chamber 303; if the oil level in the return oil chamber 301 or the supply oil chamber 303 is ≥80% of the rated volume, the controller triggers an audible and visual alarm; when the oil level is ≥90%, the controller sends a signal to the hydraulic system to stop the return oil.

[0045] Meanwhile, in this utility model, when the cover 102 is connected to the body 101, a gap is left between the top of the first partition 201 and the second partition 202 and the cover 102, forming an upper communicating space; when the oil in any of the oil return chamber 301, sedimentation chamber 302 or oil supply chamber 303 is excessive, it can flow into the adjacent chamber through the gap, thus preventing the oil in a single chamber from overflowing the body 101.

[0046] like Figure 5 As shown, a vent valve 421 is also provided. One end of the vent valve 421 passes through the cover 102 and is connected to the return oil pipe 402. The other end of the vent valve 421 is placed outside the cover 102. When oil is transferred through the return oil pipe 402, the vent valve 421 can be opened to vent the inside of the return oil pipe 402, thereby reducing the amount of gas entering the return oil chamber 301. Specifically, a rotary switch is provided on the vent valve 421. The opening degree of the vent valve 421 can be adjusted by rotating the switch, thereby adjusting the venting volume of the vent valve 421.

[0047] In addition, a sedimentation port 321 is provided at the bottom of the sedimentation chamber 302; a sedimentation box 322 is provided on the outside of the main body 101, and the sedimentation box 322 is connected to the sedimentation port 321; when impurities in the oil are sedimented in the sedimentation chamber 302, the impurities will enter the sedimentation box 322. At the same time, since the height of the sedimentation box 322 is lower than the bottom of the sedimentation chamber 302, the impurities can be further reduced from flowing with the oil when the oil flows in the sedimentation chamber 302; of course, in order to better allow impurities to enter the sedimentation box 322, the bottom of the sedimentation chamber 302 is preferably inclined, that is, the position of the sedimentation chamber 302 away from the sedimentation port 321 is inclined towards the sedimentation port 321; in this way, after the impurities are settled, they can slide towards the position of the sedimentation port 321 and fall into the sedimentation box 322; and a drain valve is provided at the bottom of the sedimentation box 322, which can be opened periodically to discharge the impurities inside the sedimentation box 322.

[0048] In this invention, to ensure that the impurity content in the oil entering the hydraulic pump is reduced, an oil suction filter 601 is also provided. The oil suction filter 601 is installed on the second partition 202 and is connected to the hydraulic pump through a pipeline. When the oil in the oil supply chamber 303 is delivered to the hydraulic pump, the oil will first enter the oil suction filter 601 and the impurities in the oil will be filtered by the oil suction filter 601. The model of the oil suction filter 601 is WU-400×180.

[0049] Meanwhile, to reduce the flow rate while preventing further impurities from entering the suction filter 601, a guide plate 602 is preferably provided. This guide plate 602 is disposed on the second partition 202 and placed inside the oil supply chamber 303. The oil in the oil supply chamber 303 is guided by the guide plate 602 before entering the suction filter 601. Specifically, the guide plate 602 is inclinedly disposed on the second partition 202, and its bottom is fixedly connected to the second partition 202. The upper part of the guide plate 602 is connected to the second partition 202 via a connecting piece. When the oil passes through… After the second through hole 221 enters the oil supply chamber 303, the impurities come into contact with the guide plate 602 and are blocked by the guide plate 602. At the same time, since the bottom of the guide plate 602 is fixedly connected to the second partition plate 202, when the oil enters the suction filter 601, the area above the lower part of the guide plate 602 needs to enter. The oil suction port of the suction filter 601 faces the bottom of the body 101. In this way, the oil needs to bypass the guide plate 602 before entering the suction filter 601, so as to avoid the generation of a negative pressure area below the oil suction port of the suction filter 601, which would cause the impurities at the bottom to follow into the suction filter 601.

[0050] In this invention, although the oil that passes through the return oil chamber 301 and settles before reaching the supply oil chamber 303 has cooled down over a certain period of time, it still retains some temperature. To reduce the temperature of the oil entering the hydraulic pump, a plurality of heat dissipation fins 701 are preferably provided. These heat dissipation fins 701 are disposed on the outer wall of the main body 101 adjacent to the supply oil chamber 303. In this way, the oil in the supply oil chamber 303 can exchange heat with the heat dissipation fins 701 through the main body 101, and the heat dissipation fins 701 can also reduce the temperature of the oil entering the hydraulic pump. The oil in the oil supply chamber 303 is cooled down; the temperature of the oil in the oil chamber is reduced more quickly; at the same time, in order to further accelerate the cooling of the oil in the oil supply chamber 303, a heat dissipation shell 702 is also provided on the outer wall of the main body 101, and a number of heat dissipation fins 701 are placed inside the heat dissipation shell 702; an exhaust device 703 is provided on the heat dissipation shell 702 to increase the air flow inside the heat dissipation shell 702; the air flow inside the number of heat dissipation fins 701 is increased by the exhaust device 703, thereby improving the heat dissipation effect of the number of heat dissipation fins 701;

[0051] In addition, the exhaust device 703 is also connected to the controller. After obtaining the temperature inside the oil supply chamber 303 through the second sensor, the controller controls the exhaust device 703 to automatically start and stop based on the obtained temperature data, thereby automatically cooling the oil inside the oil supply chamber 303. When the temperature inside the oil supply chamber 303 is ≥40℃, the controller controls the exhaust device 703 to start; when the temperature is ≤30℃, the exhaust device 703 stops. It should be noted that the number of heat dissipation fins 701 is determined according to actual needs, and this utility model will not be further described. At the same time, several heat dissipation slits are opened on the heat dissipation shell 702. Under the action of the exhaust device 703, cold air from the outside enters into the heat dissipation shell 702, and hot air inside the heat dissipation shell 702 is discharged to the outside through the heat dissipation holes. Preferably, the exhaust device 703 is multiple axial flow fans, specifically four axial flow fans.

[0052] like Figure 1 As shown, the heat dissipation pipe 800 is installed on the outer wall of the main body 101 adjacent to the oil return chamber 301. A water pump is connected to one end of the heat dissipation pipe 800, and the other end is connected to the recovery end (water tank) through a pipe. In this way, cold water enters the heat dissipation pipe 800 under the action of the water pump, and exchanges heat with the oil in the oil return chamber 301 through the heat dissipation pipe 800, thereby cooling the oil in the oil return chamber 301. The water pump is connected to a controller. The controller obtains the temperature in the oil return chamber 301 based on the first sensor, and controls the water pump to start and stop automatically based on the obtained temperature data, so as to automatically cool the oil in the oil return chamber 301. If the temperature in the oil return chamber 301 is ≥45℃, the controller controls the water pump to start; if the temperature is ≤30℃, the water pump stops.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An oil tank for a hydraulic power unit, characterized in that, include: The body (101) and the cover (102) for the body (101); The first partition (201) and the second partition (202) are disposed inside the body (101); the first partition (201) and the second partition (202) divide the interior of the body (101) into an oil return chamber (301), a sedimentation chamber (302) and an oil supply chamber (303); The first partition (201) is provided with a first through hole (211), and the second partition (202) is provided with a second through hole (221). The oil return chamber (301) is connected to the sedimentation chamber (302) through the first through hole (211), and the sedimentation chamber (302) is connected to the oil supply chamber (303) through the second through hole (221). The oil return filter device (401) is placed in the oil return chamber (301) after passing through the side wall of the main body (101) at one end. An oil return pipe (402) is provided on the inner wall of the main body (101), with one end connected to the oil return filter device (401) and the other end provided on the first partition plate (201); and a plurality of oil outlet holes (403) are provided on the oil return pipe (402), and the opening direction of the oil outlet holes (403) is opposite to the position of the first partition plate (201).

2. The oil tank for a hydraulic station according to claim 1, characterized in that, Also includes: Several temperature sensors (501) are placed inside the body (101) after passing through the cover (102) at one end.

3. The oil tank for a hydraulic station according to claim 1, characterized in that, Also includes: Several level gauges (502) are placed inside the body (101) after passing through the cover (102) at one end.

4. The oil tank for a hydraulic station according to claim 1, characterized in that, Also includes: The vent valve (421) passes through the cover (102) and is connected to the oil return pipe (402) at one end.

5. The oil tank for a hydraulic station according to claim 1, characterized in that, The sedimentation chamber (302) has a sedimentation port (321) at the bottom; a sedimentation box (322) is provided on the outside of the main body (101), and the sedimentation box (322) is connected to the sedimentation port (321).

6. The oil tank for a hydraulic station according to claim 1, characterized in that, Also includes: An oil suction filter (601) is disposed on the second partition (202) and is connected to the hydraulic pump via a pipeline.

7. The oil tank for a hydraulic station according to claim 6, characterized in that, Also includes: The guide plate (602) for guiding the oil in the oil supply chamber (303) into the oil suction filter (601) is set on the second partition plate (202) and placed inside the oil supply chamber (303).

8. The oil tank for a hydraulic station according to claim 1, characterized in that, Also includes: Several heat dissipation fins (701) are disposed on the outer wall of the main body (101) adjacent to the oil supply chamber (303).

9. The oil tank for a hydraulic station according to claim 8, characterized in that, Also includes: A heat dissipation shell (702) is disposed on the outer wall of the main body (101), and a number of heat dissipation fins (701) are placed inside it; the heat dissipation shell (702) is provided with an exhaust device (703) for increasing the airflow inside the heat dissipation shell (702).

10. The oil tank for a hydraulic station according to claim 1, characterized in that, A heat dissipation pipe (800) is disposed on the outer wall of the main body (101) adjacent to the oil return chamber (301).

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