Hydraulic oil tank and method for improving the circulation quality of hydraulic oil in a hydraulic system

Abstract

A hydraulic oil tank and a method for improving the circulation quality of hydraulic oil in a hydraulic system. The hydraulic oil tank includes a box body. A longitudinal partition divides the entire inner cavity of the box body into two parts, namely an oil return cavity and a suction oil cavity. The gap formed between the longitudinal partition and the bottom edge of the box body serves as a slit. There is a passage on the longitudinal partition for communicating the oil return cavity and the suction oil cavity. There is a spacing between the upper edge of the passage and the top end of the longitudinal partition. The oil return filter cartridge of the oil return filter is inserted into the oil return cavity. A transverse partition for guiding the oil return fluid is arranged near the periphery of the passage in the oil return cavity. The present invention provides a hydraulic oil tank with an optimized structure that is conducive to the full circulation of the oil fluid.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and particularly to a hydraulic oil tank and a method for improving the circulating quality of hydraulic oil in a hydraulic system. Background Art

[0002] A hydraulic oil tank is a container for storing the oil required for the normal operation of a hydraulic system. Additionally, it can circulate and filter the oil, precipitate impurities and condensed water, release and defoam the gas in the oil returned by the system, and monitor the temperature and quality of the oil. If the design of the suction and return oil chambers of the oil tank is unreasonable and the oil does not circulate sufficiently in the oil tank, the hot oil returned by the hydraulic system may have poor heat dissipation, the bubbles mixed in the oil may not have time to be released and dissolved, and the fine impurities contained may not have time to precipitate, etc., and then it will be directly sucked into the oil pump. High-temperature oil may cause the failure of the oil pump gasket; the gas-liquid mixture may cause abnormal noise in the oil suction area of the oil pump and cavitation; fine impurities may damage the moving pairs and cause leakage, reducing the volumetric efficiency of the oil pump and other problems. Summary of the Invention

[0003] The present invention provides a hydraulic oil tank with an optimized structure that is conducive to the full circulation of oil.

[0004] The present invention also provides a method for improving the circulating quality of hydraulic oil in a hydraulic system.

[0005] The technical solution of the present invention is as follows: A hydraulic oil tank includes a box body. A longitudinal partition divides the entire inner cavity of the box body into two parts, a return oil chamber and a suction oil chamber. The gap between the longitudinal partition and the bottom edge of the box body forms a slit. There is a passage on the longitudinal partition for communicating the return oil chamber and the suction oil chamber. There is a distance between the upper edge of the passage and the top of the longitudinal partition. The return oil filter cartridge of the return oil filter is inserted into the return oil chamber. A transverse partition for guiding the return oil is arranged near the passage in the return oil chamber. The position of the transverse partition is set near the passage, mainly to prevent the oil here from directly entering the suction oil chamber. Its purpose is to make the oil circulate more fully in the return oil chamber and facilitate the defoaming of the oil. This position is close to the suction oil chamber to prevent the return oil from directly being sucked into the suction oil chamber after coming out of the filter cartridge, failing to achieve the required effect. The return oil will churn upward due to the blockage of the side wall after coming out of the filter cartridge. Because the distance to the suction oil chamber is too close, the circulation may be insufficient, the oil may not defoam sufficiently, and the air may not be released sufficiently, resulting in poor suction quality. By blocking and guiding with the transverse partition, the oil can be made to flow in a vortex in the return oil chamber, reducing the speed, and allowing the oil in the middle part of the box body to enter the suction oil chamber through the passage above the partition, thereby extending the residence time of the oil in the return oil chamber, making the circulation of the oil tank more sufficient, and improving the suction quality.

[0006] The upper part of the longitudinal partition is provided with long strip holes, and the longitudinal partition is fixed on the inner side walls of the front and rear vertical plates of the box body by continuous welding. The long strip holes form a duct. There is a gap between the top end of the longitudinal partition and the top of the box body. The function of the gap is to connect the oil suction and return cavity, so as to allow the oil suction and return cavity to breathe due to the flow of liquid. An air filter is provided on the top of the box body, which is shared by the oil suction and return cavity and is used for the air permeability between the oil suction and return cavity and the outside of the fuel tank.

[0007] The transverse partition is located in the upper region of the oil diffusion holes of the oil return filter cartridge, and there is a clearance fit between the transverse partition and the outer wall of the oil return filter cartridge.

[0008] A drain port is provided at the lowest point of the bottom of the box body, and the drain port is blocked by a plug for draining the oil in the fuel tank when changing the oil of the hydraulic system; the box body is integrated with an oil return filter for filtering the oil return of the hydraulic system, a drain port assembly for connecting the drain pipe in the hydraulic system, and a suction port assembly for connecting the suction pipeline in the hydraulic system.

[0009] The oil return filter cartridge of the oil return filter is inserted into the internal oil return cavity of the box body, and the oil return pipeline connection port of the oil return filter is located outside the box body; a longitudinal partition is provided inside the box body between the oil return filter cartridge and the suction port assembly.

[0010] The drain port assembly includes a drain pipe connection port reserved on the outer side of the front vertical plate of the box body and a steel pipe, and the steel pipe is placed in the oil return cavity of the box body outside the oil return filter cartridge.

[0011] A liquid level gauge with an inwards concave installation is provided corresponding to the outer side of the front vertical plate of the box body in the oil suction cavity; the upper cover plate of the box body is curled upwards along the direction of the rear vertical plate to form an upper mounting seat, a lifting lug is provided on the top of the box body, lower mounting seats are provided on both sides of the bottom of the box body, and threaded seats for installing a liquid level sensor, a temperature sensor, a pressure sensor and an oil sampling valve are provided on the outer side of the front vertical plate of the box body.

[0012] The suction port assembly includes a filter screen, a suction pipe extending into the box body, a ball valve installed outside the box body and a suction pipeline connection port; the inner end of the suction pipe is an inclined section.

[0013] A method for improving the circulation quality of hydraulic oil in a hydraulic system. One end of the drain pipe in the hydraulic system is connected to a drain pipe assembly, and the other end is connected to the oil coming from the drain port of the hydraulic system. One end of the oil return pipe in the hydraulic system is connected to an oil return pipeline connection port, and the other end is connected to the oil coming from the oil return port of the hydraulic system. One end of the suction pipeline in the hydraulic system is connected to a suction port assembly, and the other end is connected to the suction port of the hydraulic system oil pump for the oil pump to suck oil; the drain pipe assembly, the oil return pipeline connection port, the suction port assembly and the air filter are integrated on the box body.

[0014] The oil return pipeline connection port of the oil return filter is located in the upper part of the box body; a longitudinal partition is provided inside the box body between the oil return filter cartridge of the oil return filter and the suction port assembly.

[0015] The longitudinal partition divides the entire inner cavity of the tank into two parts, namely the oil return cavity and the oil suction cavity. The gap between the longitudinal partition and the bottom edge of the tank forms a slit. There are channels on the longitudinal partition for connecting the oil return cavity and the oil suction cavity. The upper edge of the channel and the top of the longitudinal partition have a spacing to prevent the oil bubbles or foam generated in the oil return cavity from floating into the oil suction cavity. The oil return filter cartridge of the oil return filter is inserted into the oil return cavity. A transverse partition is arranged near the channel in the oil return cavity, and the transverse partition is in clearance fit with the outer wall of the oil return filter cartridge; there is a gap between the top of the longitudinal partition and the top of the tank for the space communication between the oil return cavity and the oil suction cavity; a drain port for draining the oil tank when changing the oil in the hydraulic system is arranged at the lowest part of the bottom of the tank; threaded seats for installing a liquid level sensor, a temperature sensor, a pressure sensor and an oil sampling valve are arranged on the outer side of the front vertical plate of the tank, which are used to install corresponding hydraulic components to monitor the liquid level height, oil temperature and oil pressure of the hydraulic oil tank, and to sample the oil for oil quality detection.

[0016] The oil return in the hydraulic system enters the oil return filter through the oil return pipeline connection port. After being filtered by the oil return filter cartridge, it returns to the oil return cavity of the tank. The returned oil is blocked and deflected by the transverse partition, and the oil flows in a vortex in the oil return cavity, forming the oil flow characteristics of a vortex. The oil flows and circulates sufficiently in the oil return cavity, and the gas dissolved in the oil is released and eliminated, and the impurities are separated. The longitudinal partition at the upper end of the channel blocks the floating foam generated by the oil return to prevent it from directly entering the oil suction cavity and being sucked by the oil pump; due to the blocking and deflection of the transverse partition, the oil in the oil return cavity after sufficient flow and circulation mainly enters the oil suction cavity through the channel of the longitudinal partition in the middle of the tank, and only a small part of the oil enters the oil suction cavity through the gap. The oil entering the oil suction cavity is filtered by the filter screen of the oil suction port assembly, then passes through the ball valve and the oil suction pipeline connection port and enters the oil suction pipeline for the next oil circulation.

[0017] The air filter has a pre-pressure function. Air freely enters the tank through the filter screen and is discharged from the tank through the air filter under the rated pre-pressure; the transverse partition is inclined upward or downward in the horizontal direction.

[0018] The present invention can provide multiple installation forms, with good versatility. Through the reasonable design of the hydraulic oil tank structure, impurities in the hydraulic oil tank can gather more conveniently at the lower convex part of the bottom through the gap at the lower part of the longitudinal partition plate to be discharged from the oil drain port; by optimizing the position setting of the longitudinal partition plate and the transverse partition plate, the oil flow line in the tank body is more reasonable, so as to produce a better heat dissipation effect, and the bubbles in the oil have a more sufficient circulation and release time; at the same time, there is a certain distance between the long strip holes and the top of the longitudinal partition plate to prevent the floating foam generated by the return oil from entering the oil suction cavity and being sucked by the oil pump; the oil suction port assembly with a filter screen and a 45° inclined plane oil suction pipe extending into the inner part of the tank body and a ball valve installed outside the tank can further reduce the oil suction resistance of the oil pump, and the ball valve is convenient for cutting off the oil source during system maintenance. The hydraulic oil tank of the present invention has a compact structure, is convenient to carry, has various installation methods, can be designed into a smaller volume, has strong versatility, and can be popularized and used in the field of construction machinery, especially on rail vehicles and railway construction machinery. Description of the Drawings

[0019] Figure 1 is the front view of the present invention;

[0020] Figure 2 is the right view of the present invention;

[0021] Figure 3 is the longitudinal partition plate of the present invention;

[0022] Figure 4 is the transverse partition plate of the present invention;

[0023] In the figure: tank body 1, lifting lug 2, maintenance cover 3, return oil filter 4, return oil pipeline connection port 4-1, return oil filter cartridge 4-2, oil drain port assembly 5, steel pipe 5-1, air filter 6, upper mounting seat 7, longitudinal partition plate 8, long strip hole 8-1, gap 8-2, transverse partition plate 9, liquid level gauge 10, oil suction port assembly 11, filter screen 11-1, ball valve 11-2, oil suction pipeline connection port 11-3, lower mounting seat 12, oil drain port 13, threaded seat 14. Embodiment

[0024] The following further details the present invention with reference to the drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0025] As Figure 1As shown in the figure, the hydraulic oil tank can be fixedly installed through the bottom and the back, and includes a hydraulic oil tank composed of a box body 1 in the shape of a cuboid, a maintenance cover 3, an oil drain port assembly 5, a return oil filter 4, an air filter 6, a suction port assembly 11, etc. The upper cover plate of the box body 1 is curled upwards along the direction of the rear vertical plate to form an upper mounting seat 7, a lifting lug 2 is arranged at the top, a threaded seat 14 and a recessed-mounted liquid level gauge 10 are arranged on the outer side of the front vertical plate, lower mounting seats 12 are arranged on both sides of the bottom, and an oil drain port 13 is convexly arranged in the middle at the bottom. A longitudinal partition plate 8 and a transverse partition plate 9 are arranged inside. The longitudinal partition plate 8 divides the interior of the box body 1 into a return oil cavity and a suction oil cavity. A long hole 8-1 is arranged between the side surface of the longitudinal partition plate 8 and the inner side of the rear vertical plate of the box body 1. A gap 8-2 is left between the bottom of the longitudinal partition plate 8 and the bottom surface of the box body 1. The long hole 8-1 is at a certain distance from the top of the longitudinal partition plate 8. The transverse partition plate 9 is arranged at the lower edge of the long hole 8-1 in the return oil cavity and at the right angle formed by the longitudinal partition plate 8 and the inner side of the rear vertical plate of the box body 1.

[0026] The upper cover plate of the box body 1 of the hydraulic oil tank is curled upwards along the direction of the rear vertical plate, and several mounting holes are arranged transversely to serve as the upper mounting seat 7 of the hydraulic oil tank; both sides of the bottom of the hydraulic oil tank are bent by plates and supported by rib plates, and two lower mounting seats 12 are arranged. The hydraulic oil tank can be placed and installed independently using the lower mounting seats 12, or can be semi-suspended and installed by using the mounting seats 12 in cooperation with the side walls and rear vertical plates of the upper mounting seat 7 at the same time. The lower mounting seats 12 are designed with the same opening orientation, which is also beneficial to placing and installing the hydraulic oil tank at the right-angle corner against the wall. The hydraulic oil tank includes a box body 1 in the shape of a cuboid. Two lifting lugs 2 are arranged at both ends of the top of the box body 1. A maintenance cover 3 is arranged on the upper part of the box body 1. The maintenance cover 3 is sealed with an oil-resistant rubber gasket and installed on the upper cover plate of the box body 1 by bolts to ensure the sealing of the whole box body. Removing the maintenance cover 3 can facilitate the cleaning, maintenance and repair of the interior of the box body 1. The return oil filter 4 is installed on the upper part of the maintenance cover 3. The return oil filter cartridge 4-2 is directly inserted into the interior of the box body 1 to facilitate the return oil of the hydraulic system to return to the box body after being filtered; an air filter 6 is also arranged on the maintenance cover. The air filter is installed after being lifted by a certain height to avoid the oil overflowing due to the inclination and shaking of the hydraulic oil tank. The air filter 6 has a pre-pressure function, and air can freely enter the box body 1 through the filter screen and is discharged from the box body 1 under the rated pre-pressure. The suction port assembly 11 is arranged on the side elevation of the hydraulic oil tank. The suction port assembly 11 includes a filter screen 11-1, a suction oil pipe with a 45° inclined section extending into the interior of the box body, and a ball valve 11-2 installed outside the box body with a suction oil pipeline connection port 11-3 reserved. Closing the ball valve 11-2 can cut off the oil source supply of the suction oil pipeline. A longitudinal partition plate 8 is arranged inside the box body 1 between the return oil filter cartridge 4-2 and the suction port assembly, dividing the whole box body 1 into a return oil cavity and a suction oil cavity. The longitudinal partition plate 8 is similar to a rectangle, and a long hole 8-1 is opened at a certain distance from the upper edge, as shown in the appendix Figure 2As shown in the figure. The longitudinal partition 8 is fixed to the inner side walls of the front and rear vertical plates of the box body by continuous welding, and a gap 8-2 is formed at a certain distance from the bottom edge of the box body. At the lower edge of the long strip hole 8-1 of the oil return cavity, a transverse partition 9 is provided at the right angle formed by the longitudinal partition 8 and the inner side of the rear vertical plate of the box body 1, which can produce a certain guiding effect on the oil flowing out of the oil return filter cartridge 4-2 in the oil return cavity, making the vortex circulation of the oil in the oil return cavity more sufficient. Generally, it prolongs the residence time of the oil returning in the hydraulic oil tank, which is more conducive to the release and elimination of the dissolved gas in the oil and the separation of impurities; an in-concave installed liquid level gauge 10 is provided in the oil suction cavity area on the outer side of the front vertical plate of the hydraulic oil tank for observing the liquid level height in the oil tank in real time. The liquid level gauge is installed by an in-concave embedded mounting seat to avoid the liquid level observation mirror protruding outward and being easily touched and damaged; several drain pipe assemblies 5 are provided in the upper part of the oil return cavity area of the front vertical plate of the hydraulic oil tank, which are mainly composed of a drain pipe connection port reserved on the outer side of the front vertical plate and a steel pipe 5-1 extending into the box body 1 on the inner side of the front vertical plate, and are used to connect the drain pipe in the hydraulic system. Several threaded seats 14 are provided in the middle and lower parts on the outer side of the front vertical plate in the oil return cavity area for installing components such as a liquid level sensor, a temperature sensor, a pressure sensor and an oil sampling valve, etc., to monitor the liquid level, liquid temperature and pressure state in the oil tank and take oil samples; the hydraulic oil tank adopts a convex design in the middle, and an oil drain port is provided at the lowest point of the convex part for draining the hydraulic oil tank.

[0027] In practical applications, as Figure 1 shown, the oil returning in the system enters the oil return filter 4 through the oil return pipeline connection port 4-1, and returns to the oil return cavity of the box body 1 after being filtered by the oil return filter cartridge 4-2. Due to the blockage of the transverse partition 9, the returned oil reaches a certain guiding effect and automatically forms a vortex oil flow characteristic. Affected by the change of the volume difference, a part of the oil enters the oil suction cavity through the long strip hole 8-1 of the longitudinal partition 8, and another smaller part of the oil also enters the oil suction cavity through the gap 8-2. After the two parts of the oil are combined and flow, they pass through the filter screen 11-1 of the oil suction port assembly 11, then pass through the ball valve 11-2 and the oil suction pipeline connection port 11-3 and enter the oil suction pipeline to enter the next cycle of the oil. Due to the optimized partition setting of the hydraulic oil tank, the oil flows and circulates more fully in the oil return cavity, generally prolonging the residence time of the oil returning in the hydraulic oil tank, which is more conducive to the release and elimination of the dissolved gas in the oil and the separation of impurities, thereby improving the quality of the oil sucked by the oil pump in the hydraulic system and being beneficial to improving the service life of the hydraulic oil pump.

[0028] Preferably, the filter screen 11-1 is a filter screen with a filtration accuracy of 120 meshes or lower, and it can also be not provided in practical applications according to different oil suction working conditions.

[0029] Figure 3Among them, in actual application, the long strip holes 8-1 of the preferred longitudinal partition plate 8 can be set as round holes, square holes or an arrangement formed by multiple holes according to the need of oil fluid circulation. The aspect ratio and area size of the long strip holes 8-1 are adaptively adjusted according to the working flow rate of the hydraulic system. The height dimension of the gap 8-2 is mainly set according to the convenience of discharging the moisture at the bottom of the oil suction chamber or cleaning and removing the oil fluid pollutants in the hydraulic oil tank during the maintenance of the hydraulic system.

[0030] Figure 4 Among them, in actual application, the preferred transverse partition plate 9 can be tilted upward or downward at a certain angle in the horizontal direction along the length or width of the oil tank according to the need of diversion, so as to obtain the best oil fluid diversion and circulation effect. The transverse partition plate 9 is located in the upper area of the oil fluid diffusion holes of the oil return filter cartridge, and the transverse partition plate 9 is in clearance fit with the outer wall of the oil return filter cartridge 4-2.

[0031] The above description in combination with the accompanying drawings is only a description of a specific embodiment of the present invention, and does not limit the technical solution of the present invention thereto. Any equivalent changes or shape modifications made according to the spirit and essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A hydraulic oil tank, characterized in that: It includes a box body (1). A longitudinal partition plate (8) divides the inner cavity of the whole box body (1) into two parts, namely an oil return cavity and an oil suction cavity. The distance between the longitudinal partition plate (8) and the bottom edge of the box body (1) forms a gap (8-2). There are channels on the longitudinal partition plate (8) for connecting the oil return cavity and the oil suction cavity. The upper edge of the channel has a distance from the top end of the longitudinal partition plate (8). The oil return filter cartridge (4-2) of the oil return filter (4) is inserted into the oil return cavity. A transverse partition plate (9) for guiding the oil return oil is arranged in the oil return cavity near the channel. A long strip hole (8-1) is opened in the upper part of the longitudinal partition plate (8). The longitudinal partition plate (8) is fixed on the inner side walls of the front and rear vertical plates of the box body by continuous welding. The long strip hole (8-1) forms the channel. There is a gap between the top end of the longitudinal partition plate (8) and the top of the box body. An air filter (6) is integrated on the box body (1). The transverse partition plate (9) is located in the upper area of the oil diffusion holes of the oil return filter cartridge. The transverse partition plate (9) is in clearance fit with the outer wall of the oil return filter cartridge (4-2). An oil drain port (13) is arranged at the lowest part of the bottom of the box body (1). The oil drain port (13) is blocked by a plug. The box body (1) is integrated with an oil return filter (4) for filtering the oil return of the hydraulic system, an oil drain port assembly (5) for connecting the oil drain pipe in the hydraulic system, and an oil suction port assembly (11) for connecting the oil suction pipe in the hydraulic system. The oil return filter cartridge (4-2) of the oil return filter (4) is inserted into the oil return cavity of the box body (1). The oil return pipe connection port (4-1) of the oil return filter (4) is located outside the box body (1). A longitudinal partition plate (8) is arranged inside the box body (1) between the oil return filter cartridge (4-2) and the oil suction port assembly (11).

2. The hydraulic oil tank according to claim 1, wherein: The oil drain port assembly (5) includes an oil drain pipe connection port reserved on the outer side of the front vertical plate of the box body (1) and a steel pipe (5-1). The steel pipe (5-1) is placed in the oil return cavity of the box body (1) outside the oil return filter cartridge (4-2).

3. The hydraulic oil tank according to claim 1, characterized in that: A liquid level gauge (10) with an inwards concave installation is arranged corresponding to the outer side of the front vertical plate of the box body (1) in the oil suction cavity. An upper mounting seat (7) is arranged on the upper part of the rear vertical plate of the box body (1). A lifting ear (2) is arranged on the top of the box body (1). Lower mounting seats (12) are arranged on both sides of the bottom of the box body (1). Threaded seats (14) for installing a liquid level sensor, a temperature sensor, a pressure sensor and an oil sampling valve are arranged on the outer side of the front vertical plate of the box body (1).

4. The hydraulic oil tank according to claim 1, characterized in that: The oil suction port assembly (11) includes a filter screen (11-1), an oil suction pipe extending into the box body (1), a ball valve (11-2) installed outside the box body and an oil suction pipe connection port (11-3). The inner end of the oil suction pipe is an inclined cut surface.

5. A method for improving the circulation quality of hydraulic oil in a hydraulic system, using the hydraulic oil tank according to any one of claims 1-4, characterized in that: One end of the oil drain pipe in the hydraulic system is connected to the oil drain pipe assembly (5), and the other end is connected to the oil coming from the oil drain port of the hydraulic system. One end of the oil return pipe in the hydraulic system is connected to the oil return pipe connection port (4-1), and the other end is connected to the oil coming from the oil return port of the hydraulic system. One end of the oil suction pipe in the hydraulic system is connected to the oil suction port assembly (11), and the other end is connected to the oil suction port of the hydraulic system oil pump for the oil pump to suck oil. The oil drain pipe assembly (5), the oil return pipe connection port (4-1), the oil suction port assembly (11) and the air filter (6) are integrated on the box body (1). Inside the box body (1), a longitudinal partition plate (8) is provided between the oil return filter cartridge (4-2) of the oil return filter (4) and the oil suction port assembly (11); the longitudinal partition plate (8) divides the inner cavity of the entire box body (1) into an oil return cavity and an oil suction cavity. The distance between the longitudinal partition plate (8) and the bottom edge of the box body (1) forms a gap (8-2). There are channels on the longitudinal partition plate (8) for connecting the oil return cavity and the oil suction cavity. The upper edge of the channel and the top of the longitudinal partition plate (8) have a distance for preventing the oil bubbles or foam generated in the oil return cavity from floating into the oil suction cavity. The oil return filter cartridge (4-2) of the oil return filter (4) is inserted into the oil return cavity. A transverse partition plate (9) is arranged near the channel in the oil return cavity. The transverse partition plate (9) is in clearance fit with the outer wall of the oil return filter cartridge (4-2); there is a gap between the top of the longitudinal partition plate (8) and the top of the box body for the spatial connection between the oil return cavity and the oil suction cavity; at the lowest point of the bottom of the box body (1), an oil drain port (13) is provided for draining the oil tank when changing the oil in the hydraulic system. The oil return in the hydraulic system enters the oil return filter (4) through the oil return pipeline connection port (4-1). After being filtered by the oil return filter cartridge (4-2), it returns to the oil return cavity of the box body (1). The returned oil is blocked and diverted by the transverse partition plate (9). The oil flows in a vortex in the oil return cavity, and the oil flows and circulates sufficiently in the oil return cavity, so that the gas dissolved in the oil is released and eliminated, and the impurities are separated. The longitudinal partition plate at the upper end of the channel blocks the floating foam generated by the oil return to prevent it from directly entering the oil suction cavity and being sucked by the oil pump; due to the blocking and diversion of the transverse partition plate (9), the oil in the oil return cavity after sufficient flow and circulation mainly enters the oil suction cavity through the channel of the longitudinal partition plate (8) in the middle of the box body, and only a small part of the oil enters the oil suction cavity through the gap (8-2). The oil entering the oil suction cavity enters the oil suction pipeline through the oil suction port assembly (11) and enters the next cycle of the oil.

6. The method for improving the circulation quality of hydraulic oil in a hydraulic system according to claim 5, characterized in that: The air filter (6) has a pre-pressure function. Air freely enters the box body through the filter screen and is discharged from the box body (1) through the air filter (6) under the rated pre-pressure; the transverse partition plate (9) is inclined upward or downward in the horizontal direction; the oil return pipeline connection port (4-1) of the oil return filter (4) is located at the upper part of the box body (1).

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