阅读说明：本技术 一种液压机构的冲洗装置 (Flushing device of hydraulic mechanism ) 是由 孙玉山 程晓培 徐燕辉 杨秋蓉 马宁锐 胡超然 宋建年 叶小华 张南林 李新旭 于 2020-12-14 设计创作，主要内容包括：本发明涉及一种液压机构的冲洗装置,冲洗装置包括油箱,油箱设有回油腔、出油腔,油箱上设有与回油腔相连的回油口,还设有与出油腔相连的出油口；冲洗装置还包括过滤结构,设有至少两个,过滤结构用于对液压油进行过滤；冲洗装置还包括位于回油腔中的回油弯管,回油弯管设于回油口上,回油弯管包括横向延伸段和竖向延伸段,竖向延伸段向下延伸布置；所述油箱包括油箱底板,油箱底板包括与所述竖向延伸段上下对应的底板对应部分；所述底板对应部分倾斜延伸,以引导液压油流动。(The invention relates to a flushing device of a hydraulic mechanism, which comprises an oil tank, wherein the oil tank is provided with an oil return cavity and an oil outlet cavity, the oil tank is provided with an oil return port connected with the oil return cavity, and the oil tank is also provided with an oil outlet connected with the oil outlet cavity; the flushing device also comprises at least two filtering structures, and the filtering structures are used for filtering the hydraulic oil; the flushing device also comprises an oil return bent pipe positioned in the oil return cavity, the oil return bent pipe is arranged on the oil return port, the oil return bent pipe comprises a transverse extending section and a vertical extending section, and the vertical extending section extends downwards; the oil tank comprises an oil tank bottom plate, and the oil tank bottom plate comprises bottom plate corresponding parts vertically corresponding to the vertical extending sections; the corresponding portion of the bottom plate extends obliquely to guide the flow of the hydraulic oil.)

1. A flushing device for a hydraulic unit, comprising:

the oil tank (200) is provided with an oil return cavity (208) and an oil outlet cavity (210), the oil tank (200) is provided with an oil return port (202) connected with the oil return cavity (208), and an oil outlet (201) connected with the oil outlet cavity (210);

the at least two filtering structures are used for filtering the hydraulic oil;

the method is characterized in that: the flushing device further comprises:

the oil return bent pipe (205) is positioned in the oil return cavity (208) and arranged on the oil return port (202), the oil return bent pipe (205) comprises a transverse extending section (2051) and a vertical extending section (2052), and the vertical extending section (2052) extends downwards;

the oil tank (200) comprises an oil tank bottom plate (204), and the oil tank bottom plate (204) comprises a bottom plate corresponding part which corresponds to the vertical extending section (2052) up and down;

the corresponding portion of the bottom plate extends obliquely to guide the flow of the hydraulic oil.

2. The flushing device of a hydraulic unit according to claim 1, characterized in that: the fuel tank (200) includes a tank side plate (213);

the corresponding part of the bottom plate extends towards the side plate (213) of the oil tank in an inclined mode, and forms a settling area with the side plate (213) of the oil tank, and filtered impurities can settle in the settling area.

3. The flushing device of a hydraulic unit according to claim 2, characterized in that: the oil tank bottom plate (204) comprises a horizontal part (2042) positioned in the settling zone, and an oil drain valve (203) is arranged at the horizontal part (2042).

4. A flushing device of a hydraulic unit according to claim 1, 2 or 3, characterized in that: the oil tank (200) further comprises at least one intermediate oil cavity (209) positioned between the oil return cavity (208) and the oil outlet cavity (210), and a partition plate (211) is arranged in the oil tank (200) to divide the interior of the oil tank (200) into the oil return cavity (208), the oil outlet cavity (210) and the intermediate oil cavity (209);

an oil passage through which the hydraulic oil passes is arranged on the partition plate (211), and the filtering structure is arranged at the oil passage;

in the flowing direction of the hydraulic oil, any two adjacent oil passing channels are arranged in a staggered mode to form a bent flow channel in the oil tank (200).

5. The flushing device of a hydraulic unit according to claim 4, characterized in that: the filtering structure is also arranged at the oil outlet (201);

the oil outlets (201) are arranged in a staggered mode with the adjacent oil passing channels.

6. The flushing device of a hydraulic unit according to claim 5, characterized in that: the filtering structure is a filter (207) fixedly arranged on the partition plate (211) and the oil tank (200).

7. The flushing device of a hydraulic unit according to claim 4, characterized in that: the vertical extending section (2052) of the oil return bent pipe (205) and the adjacent oil passing channel are arranged in a staggered mode in the horizontal direction.

8. A flushing device of a hydraulic unit according to claim 1, 2 or 3, characterized in that: the flushing device further comprises an oil return pipe (300) connected to the oil return port (202) and an oil outlet pipe (400) connected to the oil outlet (201), wherein the inner diameter of the oil return pipe (300) is larger than that of the oil outlet pipe (400).

9. A flushing device of a hydraulic unit according to claim 1, 2 or 3, characterized in that: the flushing device also comprises a mounting bracket (100), and the oil tank (200) is fixedly arranged on the mounting bracket (100);

the height of the mounting bracket (100) is adjustable.

10. The flushing device of a hydraulic unit according to claim 9, characterized in that: the mounting bracket (100) comprises a base bracket (101) and a heightening frame (102) arranged on the base bracket (101), and the oil tank (200) is detachably mounted on the heightening frame (102);

the heightening frame (102) is detachably connected with the basic bracket (101).

Technical Field

The invention relates to a flushing device of a hydraulic mechanism.

Background

The hydraulic mechanism of the circuit breaker is characterized in that the cleanliness requirement of a hydraulic system is high, the total content of internal impurities is not more than 0.05g, otherwise, the situation that the impurities scratch an internal piston or a sealing ring possibly occurs, oil leakage is caused, and the stable operation of the hydraulic operating mechanism and the circuit breaker is influenced.

When the hydraulic mechanism is operated after being assembled, new foreign matters and impurities may remain or be generated inside the hydraulic mechanism, and certain gas may remain inside the hydraulic mechanism, so that the impurities and the gas need to be discharged. The action of the hydraulic mechanism is high-speed action, the flow rate of hydraulic oil in the system is high during the action, and at the moment, internal impurities and gas are easily discharged; after the hydraulic mechanism acts, energy can be stored, an oil pump of the hydraulic mechanism can be started, and oil pressure is supplemented to the rated oil pressure. The hydraulic mechanism is connected with the flushing device, so that hydraulic oil can circularly flow in the hydraulic mechanism and the flushing device, and a new hydraulic system is formed. The flushing device can continuously filter hydraulic oil containing impurities and gas discharged by the hydraulic mechanism, and simultaneously, the filtered clean hydraulic oil is communicated with an oil pump of the hydraulic mechanism, and the hydraulic oil is pumped into the hydraulic mechanism. Since the discharged hydraulic oil is flushed out of the interior of the hydraulic mechanism due to the high flow rate of the hydraulic oil during the operation of the hydraulic mechanism, this process is called a flushing process, and this device is called a flushing device.

The current washing unit is CN 201294165Y's chinese utility model patent like the grant publication number, and the washing unit that this patent is disclosed includes the oil tank, and the oil tank separates through longitudinal baffle including returning oil chamber (the fuel feeding oil tank in this patent promptly) and going out the oil pocket (the oil extraction oil tank in this patent promptly), returns oil chamber and going out between the oil chamber, returns oil chamber and links to each other through the oil drain port of returning oil pipe and hydraulic pressure mechanism, and it is continuous with the oil inlet of hydraulic pressure mechanism through going out oil pipe to go out the oil chamber. And a filter communicated with the oil return cavity and the oil outlet cavity is fixed on the longitudinal partition plate, and hydraulic oil in the oil return cavity enters the oil outlet cavity through the filter.

The flushing device in the prior art filters hydraulic oil through the filter, so that clean hydraulic oil is introduced into the hydraulic mechanism again for circular flushing, but the problems exist that: when gas is present in the hydraulic system, cavitation may occur and the operating efficiency of the oil pump may be reduced, increasing noise and equipment wear. However, the hydraulic oil discharged by the hydraulic mechanism has a high flow rate, and can quickly roll when entering the oil return cavity, and a large amount of gas is mixed in the oil return cavity. The gas is wrapped and is flushed into the oil outlet cavity through the filter; and because the distance between the filter and the oil outlet of the oil outlet cavity is short, the flow speed of hydraulic oil is high, and gas can be further wrapped and clamped into the hydraulic mechanism. After the flushing is completed, gas remains in the hydraulic mechanism, which may cause damage to the hydraulic mechanism.

Disclosure of Invention

The invention aims to provide a flushing device of a hydraulic mechanism, which aims to solve the technical problem that the prior flushing device is easy to damage the hydraulic mechanism due to insufficient air exhaust.

In order to achieve the purpose, the technical scheme of the flushing device of the hydraulic mechanism provided by the invention is as follows: a flushing device for a hydraulic unit, comprising:

the oil tank is provided with an oil return cavity and an oil outlet cavity, an oil return port connected with the oil return cavity is formed in the oil tank, and an oil outlet connected with the oil outlet cavity is also formed in the oil tank;

the at least two filtering structures are used for filtering the hydraulic oil;

the flushing device further comprises:

the oil return bent pipe is positioned in the oil return cavity and arranged on the oil return port, and comprises a transverse extending section and a vertical extending section which are arranged in a downward extending manner;

the oil tank comprises an oil tank bottom plate, and the oil tank bottom plate comprises bottom plate corresponding parts vertically corresponding to the vertical extending sections;

the corresponding portion of the bottom plate extends obliquely to guide the flow of the hydraulic oil.

The beneficial effects are that: the oil return bent pipe can prevent hydraulic oil from splashing and overflowing and slow down the flow rate of the hydraulic oil. The bottom plate corresponds partial slope and extends, can guide the hydraulic oil that enters into the oil return intracavity and flow towards same direction, prevents that hydraulic oil from entering unordered rolling behind the oil return chamber with great velocity of flow, and the effect cooperation in two aspects reduces the degree of rolling of hydraulic oil in the oil return intracavity, reduces the gas volume of sneaking into. After the gas content of the hydraulic oil in the oil tank is reduced, the damage to the hydraulic mechanism can be reduced.

As a further optimized scheme, the oil tank comprises an oil tank side plate;

the corresponding part of the bottom plate extends towards the side plate of the oil tank in an inclined mode, and forms a settling zone with the side plate of the oil tank, and filtered impurities can settle in the settling zone.

The beneficial effects are that: the bottom plate corresponds partial slope and extends and forms the settling zone with the oil tank curb plate, can form the dead zone that flows, is convenient for carry out impurity deposit and filter, prevents that impurity from being washed again.

As a further preferable aspect, the tank bottom plate includes a horizontal portion at the settling zone, and the horizontal portion is provided with an oil drain valve.

The beneficial effects are that: the oil tank bottom plate comprises a horizontal part, and an oil drain valve is convenient to install.

As a further optimized scheme, the oil tank further comprises at least one intermediate oil cavity positioned between the oil return cavity and the oil outlet cavity, and a partition plate is arranged in the oil tank to partition the interior of the oil tank into the oil return cavity, the oil outlet cavity and the intermediate oil cavity;

the partition plate is provided with an oil passage through which hydraulic oil passes, and the filtering structure is arranged at the oil passage;

in the flowing direction of the hydraulic oil, any two adjacent oil passing channels are arranged in a staggered mode so as to form a bent flow channel in the oil tank.

The beneficial effects are that: the hydraulic oil flows in a bending way, so that the flow speed of the hydraulic oil can be further slowed down, oil-gas separation is facilitated, and impurity precipitation and filtration are facilitated.

As a further optimized scheme, the filtering structure is also arranged at the oil outlet;

the oil outlets and the adjacent oil passing channels are arranged in a staggered mode.

As a further optimized solution, the filtering structure is a filter fixedly installed on the partition plate and the oil tank.

As a further optimized scheme, the vertical extending section of the oil return bent pipe and the adjacent oil passing channel are arranged in a staggered mode in the horizontal direction.

The beneficial effects are that: after the staggered arrangement, prevent that the hydraulic oil of vertical extension section from directly flowing backward through oil passageway, prevent that the velocity of flow is too fast and lead to the relatively poor condition of filter effect to take place.

As a further optimized scheme, the flushing device further comprises an oil return pipe connected to the oil return port and an oil outlet pipe connected to the oil outlet, and the inner diameter of the oil return pipe is larger than that of the oil outlet pipe.

The beneficial effects are that: the internal diameter of returning oil pipe is great, can carry out the hydraulic pressure mechanism of big oil displacement volume and wash on the one hand, and on the other hand also can slow down the velocity of flow that enters into oil return intracavity hydraulic oil.

As a further optimized scheme, the flushing device further comprises a mounting bracket, and the oil tank is fixedly arranged on the mounting bracket;

the height of the mounting bracket is adjustable.

The beneficial effects are that: the height of the mounting bracket is adjustable, and the mounting bracket can be matched with hydraulic mechanisms with different heights.

As a further optimized scheme, the mounting bracket comprises a base bracket and a heightening bracket arranged on the base bracket, and the oil tank is detachably mounted on the heightening bracket;

the heightening frame is detachably connected with the basic bracket.

Drawings

Fig. 1 is a schematic view of an embodiment 1 of the flushing device of the hydraulic unit according to the invention;

FIG. 2 is a front view of the fuel tank of FIG. 1;

FIG. 3 is a left side view of the fuel tank of FIG. 1 (with the return elbow broken away);

FIG. 4 is a top plan view of the fuel tank of FIG. 1;

description of reference numerals:

100. mounting a bracket; 101. a base support; 102. heightening; 200. an oil tank; 201. an oil outlet; 202. an oil return port; 203. an oil drain valve; 204. an oil tank bottom plate; 2041. an inclined portion; 2042. a horizontal portion; 205. an oil return bent pipe; 2051. a laterally extending section; 2052. a vertically extending section; 206. a filter mounting hole; 207. a filter; 208. an oil return cavity; 209. a middle oil chamber; 210. an oil outlet cavity; 211. a partition plate; 212. a drain valve mounting hole; 213. an oil tank side plate; 300. an oil return pipe; 400. an oil outlet pipe; 500. a liquid level indicator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Embodiment 1 of the flushing device of a hydraulic unit according to the present invention:

as shown in fig. 1 to 4, a flushing device of a hydraulic mechanism (hereinafter, simply referred to as a flushing device) forms a circulation circuit with the hydraulic mechanism when in use, flushes out minute impurities in the hydraulic mechanism with hydraulic oil, filters the flushing liquid, and sends clean hydraulic oil to the hydraulic mechanism again.

As shown in FIG. 1, the flushing device generally comprises a mounting bracket 100 and a fuel tank 200 detachably fixed on the mounting bracket 100, wherein the mounting bracket 100 comprises a base bracket 101 and a heightening frame 102 which are detachably connected, the fuel tank 200 is detachably installed on the heightening frame 102, the detachable connection adopts bolt connection, and specifically, flanges are fixed on the fuel tank 200, the base bracket 101 and the heightening frame 102 and connected by bolts. The height of the tank 200 can be adjusted by adding or removing the heightening frame 102 so as to be adapted to hydraulic mechanisms of different heights. In order to facilitate the movement of the flushing device, a walking wheel is fixedly arranged at the bottom of the basic bracket 101.

The fuel tank 200 is constructed as shown in fig. 2 to 4, and the fuel tank 200 includes a lower tank body formed by a tank bottom plate 204 and a tank side plate 213, and an upper tank cover. Two partition plates 211 which are sequentially arranged are fixedly arranged in the oil tank 200, the partition plates 211 divide the inner cavity of the oil tank 200 into an oil return cavity 208, an intermediate oil cavity 209 and an oil outlet cavity 210, and the cavities are arranged in a straight line. An oil return port 202 and an oil outlet 201 are fixedly formed in the oil tank side plate 213, the oil return port 202 is directly communicated with the oil return cavity 208, and the oil outlet 201 is directly communicated with the oil outlet cavity 210.

An oil return pipe 300 is fixedly installed on the oil return port 202, the oil return pipe 300 is a hose, and is communicated with an oil discharge hole and an oil return cavity 208 of the hydraulic mechanism when in use, so that hydraulic oil in the hydraulic mechanism flows back into the oil tank 200; an oil outlet pipe 400 is fixed on the oil outlet 201, the oil outlet pipe 400 is a hose, the oil outlet chamber 210 and an oil pump of the hydraulic mechanism are communicated when the hydraulic mechanism works, and after the hydraulic mechanism works, the motor is started and drives the oil pump to supplement pressure.

The partition plate 211 is provided with a filter mounting hole 206, the filter mounting hole 206 is communicated with two adjacent cavities (including an oil return cavity 208, an intermediate oil cavity 209 and an oil outlet cavity 210), the filter 207 is fixedly mounted at the filter mounting hole 206, and the filter 207 filters small impurities in hydraulic oil to ensure that the hydraulic oil entering the hydraulic mechanism again is relatively pure. A filter 207 is also fixedly mounted on the oil outlet 201, and the filter 207 is positioned in the oil tank 200.

Because the flow rate of the hydraulic oil in the hydraulic mechanism is high, the flow rate of the hydraulic oil entering the oil return cavity 208 is high, more gas can be mixed in the hydraulic oil, and if the gas content is not reduced, the gas can enter the hydraulic mechanism again, so that the hydraulic mechanism is damaged, and the efficiency of the oil pump is reduced. For this reason, as shown in fig. 3, an oil return elbow 205 is fixedly installed at the oil return port 202, the oil return elbow 205 is located in the oil return cavity 208, and the oil return elbow 205 includes a horizontal extension section 2051 and a vertical extension section 2052, it should be noted that in this embodiment, the horizontal direction and the vertical direction are not absolute horizontal and vertical, but refer to a general extending direction thereof. Of course, in this embodiment, the horizontal extension section 2051 extends horizontally, and the vertical extension section 2052 extends vertically and downwardly, so that when hydraulic oil enters the oil return elbow 205, the flow rate of the hydraulic oil can be reduced, and the impact force of the hydraulic oil entering the oil return cavity 208 is reduced.

In this embodiment, in order to reduce the rolling degree of the hydraulic oil in the oil return chamber 208 and reduce the amount of the mixed gas, as shown in fig. 3, the oil tank bottom plate 204 is disposed obliquely, specifically, the oil tank bottom plate 204 includes an oblique portion 2041 and a horizontal portion 2042, and a settling zone is formed between the horizontal portion 2042 and the oil tank side plate 213 for settling impurities. The inclined portion 2041 corresponds to the vertical extending section 2052 up and down, and due to the fact that the inclined portion 2041 extends obliquely, when hydraulic oil is flushed out through the vertical extending section 2052, the inclined portion 2041 can conduct overall drainage on the hydraulic oil and guide the hydraulic oil to flow towards one direction, and therefore the rolling degree of the hydraulic oil is reduced. Further, as shown in fig. 3, in order to prevent the hydraulic oil from directly flowing to the intermediate oil chamber 209 through the filter 207 on the partition 211, the vertically extending section 2052 is arranged at an interval (in the left-right direction of fig. 3) from the adjacent filter 207.

In order to further reduce the flow speed of the hydraulic oil for better filtering and oil-gas separation, in the embodiment, the filter mounting holes 206 on the partition plates 211 are arranged in a staggered manner, so that the hydraulic oil can flow in a bent manner. Moreover, the filter 207 on the oil return port 202 is staggered with the adjacent filter 207 to prevent alignment.

In the use, the impurity that filters out deposits the settling zone that horizontal part 2042 and oil tank curb plate 213 formed more, for convenient regular cleaning, has all seted up the fuel outlet valve mounting hole 212 corresponding to each chamber on horizontal part 2042, and fixed mounting has fuel outlet valve 203 on the fuel outlet valve mounting hole 212. Still be fixed with level indicator 500 on oil tank 200, wherein, the inside intercommunication of level indicator 500 and oil tank 200 utilizes the principle of linker to indicate the liquid level height, observes the hydraulic pressure oil mass through setting up highest scale mark and minimum scale mark during the use to in time supply hydraulic oil.

As shown in fig. 1, in this embodiment, the inner diameter of the oil return pipe 300 is larger than the inner diameter of the oil outlet pipe 400, so that the hydraulic mechanism with a large oil discharge amount can be flushed, and the inner diameter of the oil return pipe 300 is larger, so that the flow rate of the hydraulic oil entering the oil return cavity 208 can be reduced. When the hydraulic flushing device is used, all pipelines are connected with the hydraulic mechanism to circulate hydraulic oil, and the hydraulic mechanism is flushed in the circulating process.

In this embodiment, the inclined portion 2041 forms a bottom plate corresponding portion up and down to the vertically extending section. The filter mounting hole forms an oil passage communicating two adjacent cavities, and the filter forms a filter structure arranged at the oil passage.

Embodiment 2 of the flushing device of the hydraulic unit of the present invention:

in embodiment 1, the height of the mounting bracket itself is adjustable by the detachable height increasing frame. In this embodiment, the height of the mounting bracket itself can be adjustable as follows: the installing support includes the support body that extends from top to bottom, and the length of support body self can be adjusted, for example, the support body includes two sections of components of a whole that can function independently etc..

Of course, in other embodiments, the height of the mounting bracket is no longer adjustable. Or the mounting bracket may be eliminated.

Embodiment 3 of the flushing device of the hydraulic unit of the present invention:

in example 1, the inner diameter of the oil return pipe is larger than that of the oil outlet pipe. In this embodiment, the inner diameter of the oil return pipe may be equal to the inner diameter of the oil outlet pipe.

Embodiment 4 of the flushing device of the hydraulic unit of the present invention:

in the embodiment 1, the vertical extending section in the oil return bent pipe and the adjacent oil passing channel are horizontally arranged in a staggered mode. In this embodiment, the vertical extension section may be arranged opposite to the adjacent oil passage.

Embodiment 5 of the flushing device of the hydraulic unit of the present invention:

in embodiment 1, three filter structures are installed at the partition plate and the oil outlet. In this embodiment, the filtering structure at the oil outlet can be eliminated. Or the filtering structure on one of the clapboards is eliminated, of course, when only one clapboard is arranged, the filtering structures are required to be arranged at the clapboards and the oil outlet, and the number of the filtering structures is at least two.

Embodiment 6 of the flushing device of the hydraulic unit of the present invention:

in example 1, any two filter structures were arranged in a staggered manner. In this embodiment, two of the filter structures may be arranged in a facing manner.

Embodiment 7 of the flushing device of the hydraulic unit of the invention:

in example 1, the filter structure is a filter, and the oil passage is a filter mounting hole. In this embodiment, the oil passing channel may be formed by spacing between the partition plate and the oil tank side plate, and the filter structure may be a filter screen fixed at the oil passing channel.

Embodiment 8 of the flushing device of the hydraulic unit of the present invention:

in embodiment 1, the tank floor includes both the inclined floor corresponding portion and the horizontal portion. In this embodiment, the oil tank bottom plate may be entirely obliquely arranged, and at this time, the oil tank bottom plate includes only the bottom plate corresponding portion.

Embodiment 9 of the flushing device of the hydraulic unit of the present invention:

in embodiment 1, the bottom plate corresponding portion extends obliquely toward the tank side plate. In this embodiment, the corresponding portion of the bottom plate may also extend obliquely toward the partition plate.

Embodiment 10 of the flushing device of the hydraulic unit of the invention:

in embodiment 1, the oil tank includes an intermediate oil chamber. In this embodiment, there may be two or more intermediate oil chambers. Or the middle oil cavity can be cancelled, so that the oil return cavity is directly communicated with the oil outlet cavity.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.