阅读说明：本技术 液压油箱及具有该液压油箱的工程机械 (Hydraulic oil tank and engineering machinery with same ) 是由 杜贞棉 刘象宝 余振华 田永丰 于 2020-06-19 设计创作，主要内容包括：本发明涉及液压装置领域,公开了一种液压油箱和工程机械,包括油箱壳体和回油盒,油箱壳体内部形成有油箱腔体、顶部设置有回油开口,回油盒包括顶盖、回油盒壳体、回油滤芯和回油管,顶盖设置于回油开口处,回油盒壳体从顶盖的底部延伸至油箱腔体内,回油滤芯安装在回油盒壳体内部,设置为回油盒壳体内的液压油通过所述回油滤芯进入所述油箱腔体内,所述顶盖具有排气管道,排气管道的进气端连通至所述回油盒壳体内部、出气端连通至所述油箱壳体外部；回油盒壳体包括至少位于上部的圆筒段,在圆筒段的侧壁上形成有回油口,回油管的出口与回油口连通,且回油管从所述回油口相对于圆筒段切向延伸设置。(The invention relates to the field of hydraulic devices, and discloses a hydraulic oil tank and engineering machinery, which comprise an oil tank shell and an oil return box, wherein an oil tank cavity is formed in the oil tank shell, and the top of the oil tank shell is provided with an oil return opening; the oil return box shell comprises a cylinder section at least positioned at the upper part, an oil return opening is formed in the side wall of the cylinder section, an outlet of the oil return pipe is communicated with the oil return opening, and the oil return pipe extends tangentially relative to the cylinder section from the oil return opening.)

1. The utility model provides a hydraulic oil tank, includes oil tank casing (1) and oil return box, oil tank casing (1) inside is formed with oil tank cavity (5), top and is provided with the oil return opening, the oil return box includes top cap (4), oil return box casing (2), oil return filter core (3) and returns oil pipe (9), top cap (4) set up in the oil return opening part, oil return box casing (2) are followed the bottom of top cap (4) extends to in oil tank cavity (5), oil return filter core (3) are installed inside oil return box casing (2), and set up to hydraulic oil in oil return box casing (2) passes through oil return filter core (3) get into in oil tank cavity (5), its characterized in that, top cap (4) have exhaust duct (41), the inlet end of exhaust duct (41) inside intercommunication to oil return box casing (2), The air outlet end is communicated to the outside of the oil tank shell (1); the oil return box shell (2) comprises a cylinder section at least located at the upper part, an oil return opening is formed in the side wall of the cylinder section, an outlet of the oil return pipe (9) is communicated with the oil return opening, and the oil return pipe (9) extends tangentially from the oil return opening relative to the cylinder section.

2. The hydraulic oil tank as claimed in claim 1, characterized in that the top cover (4) further comprises a cover plate main body (42) and a vent bypass pipe (43), the vent pipe (41) has an outer section extending to the outside of the cover plate main body (42), one end of the vent bypass pipe (43) is connected to the outer section, and the axis of the vent bypass pipe (43) is angled to the axis of the vent pipe (41).

3. A hydraulic tank according to claim 2, characterized in that the internal diameter of the bleed bypass duct (43) is smaller than the internal diameter of the bleed duct (41); and one end of the exhaust bypass pipe (43) is connected to an upper side wall of the outer section.

4. The hydraulic oil tank according to claim 2, characterized by further comprising a connection pipe (7) and a return air port (8), the return air port (8) being formed at the top or upper portion of the tank case (1), one end of the connection pipe (7) being connected to the return air port (8) and the other end being connected to the other end of the exhaust bypass (43).

5. A hydraulic tank according to claim 4, characterized in that it further comprises a line filter (6), said line filter (6) being located in the connection pipe (7) and/or in the exhaust bypass (43).

6. A hydraulic tank according to claim 1, characterized in that said return box further comprises a bottom plate (10), said return filter element (3) being formed in a cylindrical shape with a central channel (31), the bottom of said return filter element (3) being supported on said bottom plate (10), said bottom plate (10) being formed with a central through hole corresponding to the lower end of said central channel (31).

7. A hydraulic tank according to claim 6, characterized in that the return box further comprises a connection for connecting the return filter cartridge (3) to the bottom plate (10).

8. A hydraulic tank according to claim 6, characterized in that the return box further comprises an oil drain (11), one end of the oil drain (11) extending into the central channel (31) and the other end extending below the lowest level of the tank cavity (5).

9. A hydraulic tank, according to claim 1, characterized in that the inner end of said venting duct (41) extends inside said return cartridge housing (2) and outside said return filter cartridge (3).

10. A working machine, characterized in that it comprises a hydraulic tank according to any one of claims 1-9.

Technical Field

The invention relates to the field of hydraulic devices, in particular to a hydraulic oil tank and engineering machinery with the same.

Background

During storage, transportation and use of hydraulic oil, air is inevitably mixed in the hydraulic oil, and the air is usually in the form of bubbles. For an open hydraulic system oil tank, under the general condition, the upper part is communicated with the air, and the lower part stores hydraulic oil. The air bubbles mixed in the hydraulic oil can reduce the volume elastic modulus of the oil and increase the compressibility of the oil, so that action errors of an actuating element are caused, creeping and vibration are generated, and the working stability of a hydraulic system is influenced; meanwhile, the energy released by explosion when the bubbles are compressed under high pressure can generate strong vibration and noise, and equipment such as a hydraulic pump and the like can be caused to generate cavitation, so that the temperature of hydraulic oil is increased, the hydraulic oil is oxidized, and the hydraulic oil is deteriorated and deteriorated.

Fig. 1 and 2 show a structure of a common hydraulic oil tank according to the prior art, in use, hydraulic oil mixed with air bubbles enters an oil return box through an oil return pipe 9 ', enters a space between an oil return box shell 2' and an oil return filter element 3 ', is filtered by the oil return filter element 3' and then enters an oil tank cavity 5 ', a partition plate 12' is arranged in the oil tank cavity 5 'to divide the lower part of the oil return box body 5 into two parts, then most of the hydraulic oil dropping below the oil return box enters the oil inlet side of the oil tank cavity 5 on the other side of the partition plate 12' through the upper part of the partition plate 12 ', and finally enters a hydraulic system through an oil inlet filter element 13'.

The hydraulic oil tank shown in fig. 1 and 2 has the problems that a large amount of oil gas can be mixed into hydraulic oil after the hydraulic oil circulates through a hydraulic system, most of the air gas can be directly discharged into the oil tank cavity 5 'from the oil return box due to the fact that the sealed oil return box shell 2' and the oil return filter element 3 'are almost free of air bubble eliminating capacity, the staying time of the hydraulic oil in the oil tank cavity 5' is short due to the fact that the oil tank is miniaturized and the viscosity of the hydraulic oil is large, the disturbance and the staying time of the oil gas in the oil tank cavity 5 'are increased only by means of increasing the partition plates 12', air bubbles mixed in the hydraulic oil are removed, and the air bubble eliminating capacity is very limited.

Disclosure of Invention

The invention aims to provide a hydraulic oil tank capable of achieving better oil-gas separation and engineering machinery with the hydraulic oil tank.

In order to achieve the purpose, the invention provides a hydraulic oil tank, which comprises an oil tank shell and an oil return box, wherein an oil tank cavity is formed inside the oil tank shell, and the top of the oil tank shell is provided with an oil return opening; the oil return box shell comprises a cylinder section at least positioned at the upper part, an oil return opening is formed in the side wall of the cylinder section, an outlet of the oil return pipe is communicated with the oil return opening, and the oil return pipe extends tangentially from the oil return opening relative to the cylinder section.

Preferably, the top cover further comprises a cover plate main body and an exhaust bypass pipe, the exhaust duct has an outer section extending to the outer side of the cover plate main body, one end of the exhaust bypass pipe is connected to the outer section, and the axis of the exhaust bypass pipe is at an angle to the axis of the exhaust duct.

Preferably, the inner diameter of the exhaust bypass pipe is smaller than that of the exhaust pipeline; and one end of the exhaust bypass pipe is connected to an upper side wall of the outer section.

Preferably, the hydraulic oil tank further includes a connection pipe and a return air port, the return air port is formed at the top or upper portion of the oil tank case, one end of the connection pipe is connected to the return air port, and the other end is connected to the other end of the exhaust bypass.

Preferably, the hydraulic oil tank further comprises a pipe filter which is located in the connecting pipe and/or the exhaust bypass.

Preferably, the oil return box further comprises a bottom plate, the oil return filter element is formed in a cylindrical shape and provided with a central channel, the bottom of the oil return filter element is supported on the bottom plate, and a central through hole is formed in the bottom plate and corresponds to the lower end of the central channel.

Preferably, the oil return box further comprises a connector for connecting the oil return filter element to the bottom plate.

Preferably, the oil return box further comprises an oil guide pipeline, one end of the oil guide pipeline extends into the central channel, and the other end of the oil guide pipeline extends below the lowest liquid level position of the oil tank cavity.

Preferably, the inner end of the vent conduit extends into the oil return cartridge housing and is located outside the oil return cartridge.

The invention also provides engineering machinery which comprises the hydraulic oil tank.

According to the technical scheme, hydraulic oil enters the oil return box shell through the oil return pipe, the oil return pipe extends tangentially relative to the cylinder section from an oil return port in the side wall of the oil return box shell, when the hydraulic oil in the oil return pipe enters the cylinder section of the oil return box shell at a high speed, only very weak collision is generated at the joint of the oil return pipe and the oil return box shell, the flow rate attenuation of the hydraulic oil is very small, the hydraulic oil continues to do high-speed circular motion along the inner wall of the cylinder section in the cylinder section, the high-speed hydraulic oil generates centrifugal force in the cylinder section, and the specific gravity of the hydraulic oil is greater than that of air, so that the centrifugal force of the oil is greater than that of bubbles, oil drops are thrown out of a gas phase and are adhered to the inner wall surface of the oil return box shell, and; and the gas centrifugal force is smaller, the gas gathers in the central part of the oil return box and moves towards the axis of the cylinder section, and due to the structural improvement of the top cover, the bubbles and the air gathered in the center of the oil return box can be discharged out of the oil tank cavity through the exhaust pipeline in the center of the top cover, so that the oil-gas separation capacity of the hydraulic oil tank is improved, the bubbles mixed into the hydraulic oil are better eliminated, and the adverse effect of the bubbles on the hydraulic oil tank, a hydraulic system and even the whole device is reduced.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a front cross-sectional view of a hydraulic tank according to the prior art;

FIG. 2 is a schematic top view of the hydraulic oil tank of FIG. 1;

FIG. 3 is a front cross-sectional view of a hydraulic oil tank according to an embodiment of the present invention;

FIG. 4 is a schematic top view of the hydraulic oil tank of FIG. 3;

FIG. 5 is a front cross-sectional view of a top cover of the return oil tank of the hydraulic oil tank of FIG. 3;

fig. 6 is a plan view of a top cover of the oil return box of the hydraulic oil tank of fig. 3.

Description of the reference numerals

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

In the present invention, it is to be understood that the terms "away", "toward", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. These are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate that the device or component in question must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The invention provides a hydraulic oil tank, which comprises an oil tank shell 1 and an oil return box, wherein an oil tank cavity 5 is formed in the oil tank shell 1, an oil return opening is formed in the top of the oil tank shell, the oil return box comprises a top cover 4, an oil return box shell 2, an oil return filter element 3 and an oil return pipe 9, the top cover 4 is arranged at the oil return opening, the oil return box shell 2 extends into the oil tank cavity 5 from the bottom of the top cover 4, the oil return filter element 3 is arranged in the oil return box shell 2, hydraulic oil in the oil return box shell 2 enters the oil tank cavity 5 through the oil return filter element 3, the top cover 4 is provided with an exhaust pipeline 41, the air inlet end of the exhaust pipeline 41 is communicated to the interior of the oil return box shell 2, and the air outlet end is communicated to the exterior of the oil tank shell 1; the oil return box shell 2 comprises a cylinder section at least positioned at the upper part, an oil return opening is formed in the side wall of the cylinder section, an outlet of the oil return pipe 9 is communicated with the oil return opening, and the oil return pipe 9 extends tangentially from the oil return opening relative to the cylinder section.

In the hydraulic oil tank according to the invention, hydraulic oil enters the oil return box shell 2 through the oil return pipe 9, because the oil return pipe 9 extends tangentially relative to the cylinder section from an oil return port on the side wall of the oil return box shell 2, when the hydraulic oil in the oil return pipe 9 enters the cylinder section of the oil return box shell 2 at a high speed, only very weak collision is generated at the joint of the oil return pipe 9 and the oil return box shell 2, the flow rate attenuation of the hydraulic oil is very small, the hydraulic oil continues to perform high-speed circular motion along the inner wall of the cylinder section in the cylinder section, the high-speed hydraulic oil generates centrifugal force in the cylinder section, and because the specific gravity of the hydraulic oil is greater than that of air, the centrifugal force of the oil is greater than that of air, so that hydraulic oil drops are thrown out of a gas phase and adhered to the inner wall surface of the oil return box shell 2, and; and the gas centrifugal force is smaller, then gather in the central position of the oil return box, move towards the axis of the cylinder section roughly, and because the structural improvement of the top cover 4 department, gather bubble and air in the center of the oil return box can discharge to the outside of the cavity 5 of oil tank through the exhaust duct 41 in the center of the top cover 4, therefore, have improved the oil-gas separation ability of the hydraulic tank, dispel the bubble mixed into hydraulic oil better, reduce the bubble to the adverse effect of hydraulic tank, hydraulic system and even whole apparatus.

Wherein, the exhaust duct 41 is preferably arranged at the central position of the top cover 4 to facilitate the discharge of the collected gas; the cylindrical section of the return oil cartridge housing 2 has a cylindrical inner wall, and as shown in fig. 3, the return oil cartridge housing 2 may be formed entirely in the form of a cylinder, but it is understood that the return oil cartridge housing 2 may have other or even irregular restrictions as long as it is ensured that the return oil cartridge housing 2 is formed in the upper portion thereof in the shape of a cylinder (i.e., formed as the cylindrical section), while the lower portion of the return oil cartridge housing 2 may have any suitable shape; and for the cylindrical segment, it is understood that the cross section taken perpendicular to the axis may be circular, elliptical, conical, or other shape having an arc shape.

Moreover, referring to fig. 2, it can be understood that the oil return pipe 9 extends tangentially from the oil return port relative to the cylinder segment, which means that at the side wall of the oil inlet pipe 9 away from the oil return box housing 2, the inner wall of the oil inlet pipe 9 is tangent to the inner wall of the oil return box housing 2, or the inner wall of the oil inlet pipe 9 is in smooth transition with the inner wall of the oil return box housing 2, so that the oil return energy loss is reduced, the centrifugal rotation speed of hydraulic oil entering the oil return box is increased, and a better oil-gas separation effect is obtained; preferably, the return cartridge housing 2 extends in a vertical direction, the axis of the cylinder segment extends in a vertical direction, and the return pipe 9 extends in a horizontal direction, from a return opening in the return cartridge housing 2 to the outside of the hydraulic tank.

Referring to fig. 5 and 6, in the present embodiment, the top cover 4 further includes a cover main body 42 and an exhaust bypass pipe 43, the exhaust pipe 41 has an outer section extending to the outside of the cover main body 42 (the outside of the cover main body 42 refers to the side of the cover main body 42 facing away from the oil return box casing 2), one end of the exhaust bypass pipe 43 is connected to the outer section, and the axis of the exhaust bypass pipe 43 is angled with respect to the axis of the exhaust pipe 41. Therefore, gas collected to the central axis of the oil return box shell 2 enters the exhaust pipeline 41 firstly, then turns into the exhaust bypass pipe 43 and is exhausted from the exhaust bypass pipe 43, the pressure in the oil return box is high, oil gas is exhausted after turning due to the exhaust bypass pipe 43, the oil liquid exhaust resistance is increased, and therefore the phenomenon that oil liquid overflows out of an oil tank along with air or bubbles is reduced.

It is further preferable that the inner diameter of the exhaust bypass pipe 43 is smaller than the inner diameter of the exhaust pipe 41, so as to further increase the oil overflow resistance and reduce the overflow amount of oil overflowing out of the oil tank along with air or bubbles, for example, the inner diameter of the exhaust bypass pipe 43 may be smaller than one third of the inner diameter of the exhaust pipe 41; and, one end of the exhaust bypass pipe 43 is connected to the upper side wall of the outer section, for example, one end of the exhaust bypass pipe 43 may be close to the top of the exhaust duct 41, so as to further reduce the overflow amount of oil out of the oil tank along with air or air bubbles. Referring to fig. 5 and 6, an end of the vent pipe 41 facing the outside of the tank cavity 5 may be a blind end, a vent bypass pipe 43 is connected to a side wall of the vent pipe 41, and the vent bypass pipe 43, the vent pipe 41, and the cover body 42 may be integrally formed.

Moreover, the inner end of the exhaust duct 41 (referring to the end of the exhaust duct 41 facing the oil return box housing 2) extends to the inside of the oil return box housing 2 and is located outside the oil return filter element 3; preferably, the exhaust duct 41 extends as far as possible into the return oil case in order to improve the exhaust effect and avoid interference with the return oil filter element 3 and a spring or the like in the return oil case. The cover plate body 42 of the top cover 4 can be mounted on the tank case 1 by screws or bolts.

In some embodiments, the hydraulic oil tank may further include a connecting pipe 7 and a return air port 8, the return air port 8 is formed at the top or upper portion of the tank shell 1, one end of the connecting pipe 7 is connected to the return air port 8, and the other end is connected to the other end of the exhaust bypass 43, so that oil gas discharged from the exhaust pipe 41 returns to the gas space at the upper portion of the hydraulic oil in the tank cavity 5 through the connecting pipe 7 and the return air port 8, and thus the oil gas may finally return to the tank cavity 5 after entering the exhaust pipe 41 along with air or air bubbles, thereby reducing oil leakage loss.

Further preferably, the hydraulic oil tank further comprises a pipeline filter element 6, the pipeline filter element 6 is located in the connecting pipe 7 and/or the exhaust bypass 43, and the pipeline filter element 6 filters oil gas passing through the connecting pipe 7 to ensure the cleanliness of hydraulic oil. It will be understood that the connecting tube 7 represents a conduit, which may comprise only one tube, or a plurality of tubes connected to each other; the pipeline filter element 6 can comprise one or more than one, can be arranged at any position in the connecting pipeline 7, and can also be arranged in or at the end part of the exhaust pipeline 43; the oil tank shell 1 can be provided with a mounting seat at the air return port 8, and one end of the connecting pipe 7 is connected to the mounting seat; when the cover plate body 42 of the top cover 4 is attached to the tank case 1 by screws or bolts, the connecting pipe 7 extends in a direction away from the screws or bolts in order to avoid interference between the connecting pipe 7 and the screws or bolts.

In some embodiments, the oil return box further comprises a bottom plate 10, the oil return filter element 3 is formed in a cylindrical shape and has a central channel 31, the bottom of the oil return filter element 3 is supported by the bottom plate 10, and a central through hole is formed on the bottom plate 10 and corresponds to the lower end of the central channel 31; thereby, the hydraulic oil enters the space between the return cartridge housing 2 and the return filter element 3 through the return pipe 9, is filtered by the return filter element 3, enters the central channel 31 and is finally discharged from the central channel 31.

Referring to fig. 4, the oil return filter element 3 is abutted against the bottom plate 10 through a compressed spring, the upper end of the spring is abutted against the top cover 4, the lower end of the spring is abutted against the oil return filter element 3, and the bottom of the oil return filter element 3 is abutted against the bottom plate 10, so that the oil return filter element 3 is limited. Preferably, the oil return box is still including being used for with oil return filter core 3 connect in bottom plate 10's connecting piece, from this, can effectively avoid oil return filter core 3 to carry out circumferential direction under the impact of high-speed fluid, reinforcing oil return filter core 3's stability, specifically, can be provided with a plurality of connecting pieces along oil return filter core 3's axial interval, be fixed in bottom plate 10 with oil return filter core 3 to, oil return filter core 3 can be with the coaxial setting of cylindric oil return box casing 2.

In addition, referring to fig. 3, the oil return box further includes an oil guide pipeline 11, one end of the oil guide pipeline 11 extends into the central channel 31, and the other end of the oil guide pipeline extends below the lowest liquid level position of the oil tank cavity 5; the other end of the oil guide pipe 11 may have an oval port which may be formed by chamfering the side wall of the oil guide pipe 11, in this way, the oil passing area of the oil guide pipe 11 can be enlarged, thereby increasing the amount of oil.

In addition, the hydraulic oil tank can further comprise a vent valve, a partition plate and an oil inlet filter element, the vent valve can be arranged at the top of the oil tank shell 1, and when the air pressure in the oil tank cavity 5 is too high, the vent valve is opened to be connected with the atmosphere for pressure relief; the baffle is positioned in the oil tank cavity 5 to cut the oil tank cavity 5 at least at the bottom, the lower end of the oil return box is positioned at one side of the baffle, and the oil inlet filter core is positioned at the other side of the baffle to further increase the disturbance and residence time of oil gas in the oil tank cavity 5 through the baffle so as to remove bubbles mixed in hydraulic oil; also, it is understood that the hydraulic oil tank may include a plurality of the oil return cartridges.

According to another aspect of the invention, a working machine is provided, comprising a hydraulic oil tank according to the invention. Specifically, the working machine may be an excavator or the like.

In the description herein, reference to the terms "one embodiment," "some embodiments," "for example," or "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples and features of the various embodiments or examples described in this specification can be combined and combined by those skilled in the art without contradiction.

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, many simple modifications can be made to the technical solution of the invention. Including each of the specific features, are combined in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.