阅读说明：本技术 液压油箱及液压系统 (Hydraulic oil tank and hydraulic system ) 是由 杜贞棉 刘象宝 余振华 陈华波 吴保烁 于 2021-07-30 设计创作，主要内容包括：本发明涉及液压领域,公开了一种液压油箱及液压系统,其中,所述液压油箱包括回油盒(1)、储油腔(2)、设置在所述储油腔(2)中的回油过滤件(3),所述回油盒(1)中设置有流体连通于所述回油过滤件(3)的油气分离器(4)。通过上述技术方案,油气分离器和回油过滤件彼此独立,在液压油过滤前实现油气分离,避免未经油气分离处理的液压油直接通过过滤进入到储油腔,保证了油气分离效率,提高液压系统的工作可靠性和液压油的使用寿命。(The invention relates to the field of hydraulic pressure and discloses a hydraulic oil tank and a hydraulic system, wherein the hydraulic oil tank comprises an oil return box (1), an oil storage cavity (2) and an oil return filtering piece (3) arranged in the oil storage cavity (2), and an oil-gas separator (4) communicated with the oil return filtering piece (3) in a fluid mode is arranged in the oil return box (1). Through above-mentioned technical scheme, oil-gas separator and return oil filter piece are independent each other, realize oil-gas separation before hydraulic oil filters, avoid the hydraulic oil that does not pass through oil-gas separation processing directly to enter into the oil storage chamber through filtering, have guaranteed oil-gas separation efficiency, improve hydraulic system's operational reliability and the life of hydraulic oil.)

1. The utility model provides a hydraulic tank, its characterized in that, hydraulic tank includes oil return box (1), oil storage chamber (2), sets up oil return filter piece (3) in oil storage chamber (2), be provided with in oil return box (1) fluid communicate in oil return filter piece (3) oil and gas separator (4).

2. The hydraulic tank according to claim 1, wherein the gas-oil separator (4) comprises a vertically extending tubular main body portion (5), and the hydraulic tank comprises an oil return pipe (9) in fluid communication with the main body portion (5), the oil return pipe (9) extending in a tangential direction of the main body portion (5).

3. The hydraulic tank according to claim 2, characterized in that the gas-oil separator (4) comprises a gas discharge pipe (7) extending upwards from the main body (5).

4. A hydraulic tank according to claim 3, characterized in that it comprises a breather valve (13) communicating with the upper portion of the reservoir chamber (2), the exhaust pipe (7) communicating with the upper portion of the reservoir chamber (2), the outlet end of the exhaust pipe (7) being provided with a filter.

5. A hydraulic tank according to claim 2, characterized in that the lower end of the main body (5) is connected to an oil drain pipe (6) in fluid communication with the oil return filter (3).

6. A hydraulic oil tank according to claim 5, characterized in that the oil drain pipe (6) includes a tapered portion connected to a lower end of the main body portion (5) and a straight pipe portion connected to a lower end of the tapered portion.

7. A hydraulic tank according to claim 6, characterized in that the inner peripheral surface of the main body portion (5) and/or the inner peripheral surface of the tapered portion is provided with a spiral rib (8).

8. The hydraulic tank according to claim 2, characterized in that the return filter element (3) comprises a filter screen enclosing a filter chamber, the air-oil separator (4) being in fluid communication inside the filter chamber.

9. A hydraulic tank according to claim 1, characterized in that it comprises an oil inlet pipe (10) in fluid communication with the oil reservoir chamber (2) and a partition (11) arranged in the oil reservoir chamber (2) extending upwards from the bottom, said partition (11) being located between the oil return filter element (3) and the oil inlet pipe (10).

10. A hydraulic system, characterized in that it is provided with a hydraulic tank according to any one of claims 1-9.

Technical Field

The invention relates to the field of hydraulic pressure, in particular to a hydraulic oil tank and a hydraulic system.

Background

Excavator hydraulic tank is mostly open structure, through the pressure of breather valve control hydraulic tank, therefore hydraulic oil is mixed with a large amount of gases in the work use. The bubbles not only reduce the volume elastic modulus of the oil, but also increase the compressibility of the oil, thereby causing the action of the executive component to have errors, generating crawling and vibration and influencing the working stability of the hydraulic system. In addition, the energy released by explosion when the bubbles are compressed under high pressure can generate strong vibration and noise, and cause cavitation of equipment such as a hydraulic pump and the like, so that the temperature of hydraulic oil is increased, the hydraulic oil is oxidized, and the hydraulic oil is deteriorated and deteriorated.

At present, the retention time of oil in an oil tank is prolonged and the floating amount of bubbles is increased by increasing the volume of the oil tank and adding a turbulence partition plate. And part of the oil tank adopts an oil inlet and return filter element with a bubble adsorption function or an oil suction cavity closed structure, and the communication between the oil return cavity and the oil suction cavity and the pressure of an oil suction port are controlled by the valve core.

Disclosure of Invention

The invention aims to provide a hydraulic oil tank to solve the problem of insufficient gas separation of hydraulic oil.

In order to achieve the above object, an aspect of the present invention provides a hydraulic oil tank, where the hydraulic oil tank includes an oil return box, an oil storage chamber, and an oil return filter element disposed in the oil storage chamber, and an oil-gas separator fluidly connected to the oil return filter element is disposed in the oil return box.

Optionally, the oil separator includes a vertically extending tubular main body portion, and the hydraulic oil tank includes an oil return pipe in fluid communication with the main body portion, the oil return pipe extending in a tangential direction of the main body portion.

Optionally, the gas-oil separator includes a gas discharge pipe extending upward from the main body portion.

Optionally, the hydraulic oil tank includes a vent valve communicated with the upper portion of the oil storage chamber, the exhaust pipe is communicated with the upper portion of the oil storage chamber, and the outlet end of the exhaust pipe is provided with a filter element.

Optionally, an oil drain pipe in fluid communication with the oil return filter is connected to a lower end of the main body portion.

Alternatively, the oil discharge pipe includes a tapered portion connected to a lower end of the main body portion and a straight pipe portion connected to a lower end of the tapered portion.

Optionally, a spiral rib is provided on an inner peripheral surface of the main body portion and/or an inner peripheral surface of the tapered portion.

Optionally, the oil return filter element includes a filter screen enclosing a filter cavity, and the oil-gas separator is in fluid communication with the inside of the filter cavity.

Optionally, the hydraulic tank includes an oil inlet pipe in fluid communication with the oil storage chamber and a partition plate disposed in the oil storage chamber and extending upward from the bottom, the partition plate being located between the oil return filter member and the oil inlet pipe.

In addition, the invention also provides a hydraulic system, wherein the hydraulic system is provided with the hydraulic oil tank in the scheme.

Through above-mentioned technical scheme, oil-gas separator and return oil filter piece are independent each other, realize oil-gas separation before hydraulic oil filters, avoid the hydraulic oil that does not pass through oil-gas separation processing directly to enter into the oil storage chamber through filtering, have guaranteed oil-gas separation efficiency, improve hydraulic system's operational reliability and the life of hydraulic oil.

Drawings

Fig. 1 is a schematic view of the internal structure of a hydraulic oil tank according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an oil separator according to an embodiment of the present invention.

Description of the reference numerals

1 oil return box 2 oil storage cavity

3 oil return filter element 4 oil-gas separator

5 main body part 6 oil drain pipe

7 exhaust pipe 8 spiral rib

9 return oil pipe 10 oil inlet pipe

11 baffle 12 oil inlet filtering piece

13 breather valve

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Reference to "fluid communication" in this context means allowing fluid to be transported in a flow between at least two components, which may be unidirectional or bidirectional.

The invention provides a hydraulic oil tank, which comprises an oil return box 1, an oil storage cavity 2 and an oil return filtering piece 3 arranged in the oil storage cavity 2, wherein an oil-gas separator 4 communicated with the oil return filtering piece 3 in a fluid mode is arranged in the oil return box 1.

As shown in fig. 1, the hydraulic oil tank includes an oil return box 1 and an oil reservoir chamber 2 which are independent from each other.

The oil-gas separator 4 can perform oil-gas separation on the hydraulic oil which flows back to the hydraulic oil tank so as to separate gas from the hydraulic oil and avoid cavitation.

The oil return filtering piece 3 is arranged in the oil storage cavity 2, the oil-gas separator 4 is arranged in the oil return box 1, namely, the oil-gas separator 4 and the oil return filtering piece 3 are relatively independent, the filtering process of hydraulic oil in the oil-gas separation process is two relatively independent processes, and the hydraulic oil after oil-gas separation can flow into the oil return filtering piece 3. Compare in the mode that carries out oil-gas separation simultaneously in the oil return filters, can avoid mixing during gaseous hydraulic oil directly filters the back gets into the oil storage chamber, avoid the oil-gas separation of hydraulic oil to handle inadequately, improved oil-gas separation's efficiency to guarantee hydraulic system's security.

In this scheme, oil-gas separator and return oil filter piece are independent each other, realize oil-gas separation before hydraulic oil filters, avoid the hydraulic oil that does not pass through oil-gas separation processing directly to enter into the oil storage chamber through filtering, have guaranteed oil-gas separation efficiency, improve hydraulic system's operational reliability and the life of hydraulic oil.

Specifically, the oil-gas separator 4 includes a vertically extending tubular main body portion 5, the hydraulic oil tank includes an oil return pipe 9 in fluid communication with the main body portion 5, and the oil return pipe 9 extends along a tangential direction of the main body portion 5. As shown in fig. 1 and 2, the main body 5 is formed in a substantially tubular shape, the oil return pipe 9 is connected to the main body 5 in a tangential direction, the hydraulic oil entering the main body 5 through the oil return pipe 9 forms a rotational flow along the inner peripheral wall, and the gas flows toward the central axis of the main body 5 and is separated from the hydraulic oil on the inner peripheral wall, i.e., the gas in the hydraulic oil is separated by a centrifugal action. The hydraulic oil tank may be provided with a plurality of oil return pipes 9, and the oil return pipes may be connected to different circumferential positions of the main body 5.

In addition, the gas-oil separator 4 includes a gas discharge pipe 7 extending upward from the main body portion 5. The exhaust pipe 7 extends upwardly from the main body 5 to convey the gas in the main body 5 upwardly away from the main body 5. Specifically, the hydraulic oil fed from the oil return pipe 9 forms a swirling flow in the main body 5, the central axis position of the main body 5 is substantially free of hydraulic oil, and the exhaust pipe 7 is disposed at the central axis position or a position slightly off-center, which allows the separated gas to be discharged through the exhaust pipe 7. As shown in fig. 1, the top of the main body 5 may be sealed by a sealing plate through which the vent pipe 7 passes, the vent pipe 7 including a vertical portion extending upward from the central axis and a lateral portion which can deliver gas to a target location, such as the upper portion of the reservoir chamber 2 or the outside of the hydraulic tank as described below. In other embodiments, the gas-oil separator 4 may not be provided with the exhaust pipe 7, and its upper end communicates with the other part of the hydraulic tank to discharge the separated gas to the other part.

Further, hydraulic tank including communicate in the breather valve 13 on the upper portion of oil storage chamber 2, blast pipe 7 communicates in the upper portion of oil storage chamber 2, the exit end of blast pipe 7 is provided with and filters. The upper part of the oil storage chamber 2 (the part corresponding to the oil return box 1 in the horizontal direction) is not provided with hydraulic oil, and the exhaust pipe 7 can convey the gas in the oil-gas separator 4 to the upper part of the oil storage chamber 2 and discharge the gas through the vent valve 13; in particular, the outlet of the exhaust pipe 7 is provided with a filtering piece which can filter solid impurities in the hydraulic oil, so that the hydraulic oil is prevented from directly entering the oil storage cavity 2 through the exhaust pipe 7, meanwhile, the resistance of the hydraulic oil flowing out through the vent hole is increased, and the liquid flow is reduced from flowing out from the vent hole.

In addition, an oil discharge pipe 6 in fluid communication with the oil return filter member 3 is connected to a lower end of the main body portion 5. As shown in fig. 1, the oil discharge pipe 6 is connected to the lower end of the main body 5 and is communicated with the oil return filter member 3, the oil return pipe 9 is communicated with the upper end of the main body 5, the backflow hydraulic oil flows downward in a rotational flow formed on the inner periphery of the main body 5, and is finally conveyed to the oil return filter member 3 through the oil discharge pipe 6, and the hydraulic oil subjected to oil-gas separation is filtered to remove solid impurities therein.

Further, the oil discharge pipe 6 includes a tapered portion connected to a lower end of the main body portion 5 and a straight pipe portion connected to a lower end of the tapered portion. As shown in fig. 1, the tapered portion connects the main body portion 5 having a larger inner diameter to the straight pipe portion having a smaller inner diameter, so that the hydraulic oil is gathered together and further delivered into the oil return filter member 3.

In addition, a spiral rib 8 is provided on the inner peripheral surface of the main body portion 5 and/or the inner peripheral surface of the tapered portion. Spiral muscle 8 is protruding for the inner peripheral surface of main part 5, can provide ascending holding power for the whirl that hydraulic oil formed to a certain extent to bear hydraulic oil, alleviate the whereabouts trend of hydraulic oil, make hydraulic oil can rotate more the number of turns in main part 5, separate gas wherein more fully. In addition, a spiral rib 8 is provided on the inner peripheral surface of the tapered portion, the function of which is substantially similar to that of the spiral rib 8 in the main body portion 5.

Specifically, the oil return filtering element 3 comprises a filtering net enclosing a filtering cavity, and the oil-gas separator 4 is in fluid communication with the inside of the filtering cavity. The oil return filter member 3 comprises a filter screen which is enclosed into a closed (without considering the mesh) structure, the hydraulic oil processed by the oil-gas separator 4 enters a filter cavity enclosed by the filter screen, then passes through the filter screen and enters the oil storage cavity 2, and solid impurities are left in the filter cavity. The filter screen can be to carrying out abundant rectification, reduces the disturbance of liquid stream, further promotes the bubble come-up separating capacity to realize the miniaturized design of hydraulic tank. Wherein the oil discharge pipe 6 of the oil separator 4 can be inserted into the filter chamber. The lower end of the oil return filtering piece 3 is arranged on a support at the bottom of the oil storage cavity 2, so that the stability of the oil return filtering piece is improved.

In addition, the hydraulic oil tank comprises an oil inlet pipe 10 which is in fluid communication with the oil storage cavity 2 and a partition plate 11 which is arranged in the oil storage cavity 2 and extends upwards from the bottom, wherein the partition plate 11 is positioned between the oil return filter member 3 and the oil inlet pipe 10. The partition plate 11 can prevent the hydraulic oil discharged from the oil return filter member 3 from directly flowing to the oil inlet pipe 10, and conversely, the hydraulic oil discharged from the oil return filter member 3 needs to go upwards over the partition plate 11 and then flow to the oil inlet pipe 10, so that the flow rate of the hydraulic oil can be reduced, and the severe disturbance of the hydraulic oil is avoided. An inlet of the oil inlet pipe 10 is provided with an oil inlet filter member 12 to filter hydraulic oil entering the oil inlet pipe 12.

In addition, the invention also provides a hydraulic system, wherein the hydraulic system is provided with the hydraulic oil tank in the scheme.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.