阅读说明：本技术 消泡过滤装置及液压油箱 (Defoaming filter equipment and hydraulic tank ) 是由 杨胜清 冀宏 李茜 李森林 林博 王素燕 孙飞 张贺 陈乾鹏 于 2021-07-26 设计创作，主要内容包括：本发明涉及液压油箱,为解决现有液压油箱消泡效果差的问题,提供一种消泡过滤装置及液压油箱,其中消泡过滤装置包括回油滤筒和固定安装于其内部的回油滤芯,回油滤筒的滤筒底座上设置有回油入口,在回油滤筒内固定安装有气泡吸附筒,气泡吸附筒位于回油滤芯外侧且与回油滤芯和回油滤筒的滤筒侧壁之间均具有竖向过油腔室；气泡吸附筒上端与回油滤筒的上端法兰固定连接,下端与回油滤筒的滤筒底座连接；在气泡吸附筒上设置有连通其两侧的过油孔群且气泡吸附筒的内壁面和外壁面为吸附气泡的粗糙面结构。本发明消泡过滤装置通过设置具有粗糙面结构的气泡吸附筒,增强过滤装置的消泡能力。(The invention relates to a hydraulic oil tank, and provides a defoaming filtering device and a hydraulic oil tank for solving the problem of poor defoaming effect of the existing hydraulic oil tank, wherein the defoaming filtering device comprises an oil return filter cartridge and an oil return filter element fixedly arranged in the oil return filter cartridge; the upper end of the bubble adsorption cylinder is fixedly connected with an upper end flange of the oil return filter cylinder, and the lower end of the bubble adsorption cylinder is connected with a filter cylinder base of the oil return filter cylinder; the bubble adsorption cylinder is provided with oil hole groups communicated with the two sides of the bubble adsorption cylinder, and the inner wall surface and the outer wall surface of the bubble adsorption cylinder are of a rough surface structure for adsorbing bubbles. The defoaming filtering device is provided with the bubble adsorption cylinder with the rough surface structure, so that the defoaming capability of the filtering device is enhanced.)

1. A defoaming filtering device comprises an oil return filter cartridge and an oil return filter element fixedly arranged in the oil return filter cartridge, wherein an oil return inlet communicated with an inner cavity of the oil return filter element is formed in a filter cartridge base of the oil return filter cartridge; the upper end of the bubble adsorption cylinder is fixedly connected with an upper end flange of the oil return filter cylinder, and the lower end of the bubble adsorption cylinder is connected with a filter cylinder base of the oil return filter cylinder; the bubble adsorption cylinder is provided with oil hole groups communicated with the two sides of the bubble adsorption cylinder, and the inner wall surface and the outer wall surface of the bubble adsorption cylinder are provided with rough surface structures for adsorbing bubbles.

2. The defoaming filtering device according to claim 1, wherein the average height of the oil through holes on the bubble adsorption cylinder is higher than the height of the center of the oil return filter element and the average height of the oil through holes on the side wall of the filter cylinder.

3. The defoaming filtering device according to claim 2, wherein the oil through hole group on the bubble adsorption cylinder is arranged in a region above the middle of the bubble adsorption cylinder, and the oil through hole group on the side wall of the filter cylinder is arranged in a region below the middle of the side wall of the filter cylinder.

4. The defoaming filtering device according to any one of claims 1 to 3, wherein the pore diameter of the holes in the oil through hole group on the side wall of the filter cartridge is 3mm to 5mm, and the pore diameter of the holes in the oil through hole group on the bubble adsorption cartridge is 5mm to 20 mm.

5. The defoaming filtering apparatus according to any one of claims 1 to 3, wherein the roughened surface structure of the inner wall surface and the outer wall surface of the bubble adsorbing cylinder is formed by a sieve fixed on the wall surface of the bubble adsorbing cylinder.

6. The defoaming filtering apparatus according to any one of claims 1 to 3, wherein the roughened surface structure of the inner wall surface and the outer wall surface of the bubble adsorbing cylinder is composed of a perforated plate fixed on the wall surface of the bubble adsorbing cylinder, and the diameter of the holes in the perforated plate is 0.1mm to 2 mm.

7. The defoaming filtering apparatus according to any one of claims 1 to 3, wherein the roughened surface structure of the inner wall surface and the outer wall surface of the bubble adsorbing cylinder is formed by a plurality of pits or projections having a radial dimension of 0.1mm to 2mm provided on the side wall of the filter cylinder.

8. The defoaming filtering device according to any one of claims 1 to 3, wherein the filter cartridge base comprises a bottom plate fixedly connected with the side wall of the filter cartridge at the peripheral edge, a filter element fixing steel pipe penetrating the middle part of the bottom plate from bottom to top and welded with the bottom plate, and an oil inlet flange fixed at the lower end of the filter element fixing steel pipe, and the oil return inlet is arranged on the oil inlet flange and communicated with the filter element fixing steel pipe.

9. A hydraulic oil tank comprises a tank body, wherein a partition plate which divides an inner cavity of the tank body into an oil return cavity and an oil suction cavity is arranged in the tank body, the hydraulic oil tank is characterized by further comprising the defoaming filtering device according to any one of claims 1 to 8, the defoaming filtering device is positioned in the oil return cavity, the upper end flange is fixedly connected to a top wall plate of the tank body, at least one oil return steel pipe is fixedly connected to a base of a filter cylinder, a first end of the oil return steel pipe is communicated with an oil return inlet on the oil return filter cylinder, and a second end of the oil return steel pipe is fixed to a side wall of the tank body.

10. The hydraulic oil tank as claimed in claim 8, wherein two oil return steel pipes are fixedly connected to the filter cartridge base, and second ends of the two oil return steel pipes are respectively fixed to two mutually perpendicular side walls of the tank body.

Technical Field

The invention relates to a hydraulic oil tank, in particular to a defoaming filtering device and a hydraulic oil tank.

Background

The hydraulic oil tank is an important part of a hydraulic system of engineering machinery, and a filtering device is arranged in the hydraulic oil tank and plays a role in filtering return oil of the hydraulic system. The hydraulic oil tank plays the roles of storing, defoaming and assisting in heat dissipation of hydraulic oil at the same time.

Hydraulic oil acts as a power transfer medium, which generates a large number of bubbles in the oil during the compression and release cycles and as it flows from the lines into the hydraulic tank. Bubbles in the oil are the root cause of noise, vibration, cavitation and cavitation of a hydraulic system, a large amount of bubbles can cause low working efficiency of elements, the oil temperature of the system is increased, the efficiency of the whole machine is low, and meanwhile, the aging of the oil is accelerated. The defoaming of the hydraulic system needs to reduce the generation of bubbles on the one hand and improve the defoaming efficiency on the other hand, and the improvement of the defoaming efficiency for the hydraulic oil tank is to consider how to quickly eliminate the generated bubbles.

The hydraulic oil tank is generally composed of a tank body, an oil return filter, an oil suction filter, a liquid level meter, a breather and other parts. The box body is provided with an oil return filter cylinder, a partition plate and various flanges, and the oil return filter cylinder is internally provided with an oil return filter element and is connected with various oil return steel pipes, the partition plate, a filter cylinder oil outlet steel pipe and the like.

In the existing hydraulic oil tank, return oil of a hydraulic system is filtered by an oil return filter element and then sequentially enters an oil return cavity and an oil suction cavity, and defoaming mainly depends on bubbles to float naturally in the process. Because the diameter of the air cells in the oil is very small, the floating speed of the air cells is very slow, and even the air cells are in a suspension state, the existing defoaming effect is not ideal and poor.

Disclosure of Invention

The invention aims to solve the technical problem that the existing hydraulic oil tank is poor in defoaming effect, and provides a defoaming filtering device and a hydraulic oil tank, so that the defoaming effect is improved.

The technical scheme for realizing the purpose of the invention is as follows: the defoaming filtering device is characterized in that a bubble adsorption cylinder is fixedly arranged in the oil return filtering cylinder, and is positioned at the outer side of the oil return filtering core and vertical oil passing chambers are arranged between the bubble adsorption cylinder and the side walls of the oil return filtering core and the oil return filtering cylinder; the upper end of the bubble adsorption cylinder is fixedly connected with an upper end flange of the oil return filter cylinder, and the lower end of the bubble adsorption cylinder is connected with a filter cylinder base of the oil return filter cylinder; the bubble adsorption cylinder is provided with oil hole groups communicated with the two sides of the bubble adsorption cylinder, and the inner wall surface and the outer wall surface of the bubble adsorption cylinder are provided with rough surface structures for adsorbing bubbles. In the invention, by arranging the bubble adsorption cylinder, the action of adsorbing micro bubbles on the rough surface of the bubble adsorption cylinder is utilized, and the micro bubbles are gathered and combined to form large bubbles, so that the large bubbles are easier to float out of the liquid surface, and the defoaming of the oil liquid is realized; oil liquid from the oil return filter element sequentially passes through the channels on the two sides of the bubble adsorption cylinder, so that the flowing time of the oil liquid is prolonged, bubbles are discharged out of the liquid level, and defoaming is further realized; resistance is generated in a certain space through the resistance action of the hole group, and the flowing speed of the vacuole group to the downstream is slowed down, so that the upstream bubbles float for a longer time; in the oil return filter element, the oil return mode is from bottom to top, no impact exists, on one hand, the initial upward flowing direction is provided for bubbles, on the other hand, the speed of the bubbles entering the oil tank in group flow is reduced, the disturbance and the vortex in the oil tank are effectively reduced, and the upward floating of the bubbles is facilitated. The method integrates the above aspects, effectively integrates various methods, provides a plurality of convenient conditions for merging, gathering and floating of bubbles, achieves the purpose of defoaming the structure of the hydraulic oil tank, and effectively reduces the defoaming cost of the hydraulic system.

In the defoaming and filtering device, the average height of the oil through hole groups on the bubble adsorption cylinder is higher than the height of the center position of the oil return filter element and the average height of the oil through hole groups on the side wall of the filter cylinder. Furthermore, the oil hole group on the bubble adsorption cylinder is arranged in the area above the middle of the bubble adsorption cylinder, and the oil hole group on the side wall of the filter cylinder is arranged in the area below the middle of the side wall of the filter cylinder. Adopt this structure for the fluid that comes out from the oil return filter core upwards flows earlier, flows downwards again after the oil hole crowd that crosses on the bubble adsorption section of thick bamboo, thereby increases the flow path length of fluid, improves and helps fluid and bubble adsorption section of thick bamboo surface contact, makes the bubble have time fully to grow up the come-up, improves defoaming effect.

In the defoaming and filtering device, the aperture of the holes in the oil hole group on the side wall of the filter cylinder is 3-5 mm, and the aperture of the holes in the oil hole group on the bubble adsorption cylinder is 5-20 mm.

In the defoaming and filtering device, the rough surface structure of the inner wall surface and the outer wall surface of the bubble adsorption cylinder is formed by a filter screen fixed on the wall surface of the bubble adsorption cylinder. Or the rough surface structure of the inner wall surface and the outer wall surface of the bubble adsorption cylinder is composed of a porous plate fixed on the wall surface of the bubble adsorption cylinder, and the aperture of the hole in the porous plate is 0.1mm-2 mm. Or the rough surface structure of the inner wall surface and the outer wall surface of the bubble adsorption cylinder is formed by a plurality of pits or bulges with the radial size of 0.1mm-2mm arranged on the side wall of the filter cylinder. The roughness of the inner wall surface and the outer wall surface of the bubble adsorption cylinder forms a rough surface structure on the bubble adsorption cylinder.

In the defoaming and filtering device, the filter cartridge base comprises a bottom plate, a filter element fixing steel pipe and an oil inlet flange, wherein the peripheral edge of the bottom plate is fixedly connected with the side wall of the filter cartridge, the filter element fixing steel pipe penetrates through the middle of the bottom plate from bottom to top and is welded with the bottom plate, the oil inlet flange is fixed at the lower end of the filter element fixing steel pipe, and the oil return inlet is arranged on the oil inlet flange and is communicated with the filter element fixing steel pipe.

The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a hydraulic tank, includes the box, is provided with the baffle that separates into back oil chamber and oil absorption chamber with the box inner chamber in the box, and its characterized in that still includes aforementioned defoaming filter equipment, defoaming filter equipment is located the oil return intracavity, upper end flange fixed connection be in on the top wallboard of box, strain a section of thick bamboo base on at least one oil return steel pipe of fixedly connected with, the first end of oil return steel pipe and the oil return are strained the oil return entry intercommunication on the section of thick bamboo, and the second end is fixed on the lateral wall of box.

In the hydraulic oil tank, two oil return steel pipes are fixedly connected to the filter cylinder base, and second ends of the two oil return steel pipes are respectively fixed to two mutually perpendicular side walls of the tank body. The oil return steel pipes not only play a role in oil circuit connection, but also play a role in supporting and fixing the lower end of the defoaming filtering device, and the two oil return steel pipes fix the lower end of the defoaming filtering device from two directions, so that the lower end of the defoaming filtering device is prevented from shaking along with a device.

Compared with the prior art, the defoaming filtering device provided by the invention has the advantage that the defoaming capability of the filtering device is enhanced by arranging the bubble adsorption cylinder with the rough surface structure.

Drawings

FIG. 1 is a blank view of a hydraulic tank of the present invention.

Fig. 2 is a schematic structural diagram of the defoaming filtering device of the present invention.

Fig. 3 is a schematic structural view of the oil return filter cartridge of the present invention.

Fig. 4 is a cross-sectional view of the hydraulic oil tank of the present invention.

Fig. 5 is an expanded view of the bubble adsorbing cartridge in the present invention.

FIG. 6 is a side view and an enlarged view of the bubble adsorbing cartridge of the present invention after development.

Part names and serial numbers in the figure:

the filter comprises a box body 10, a partition plate 11, a defoaming filtering device 2, an oil return filter cylinder 20, an upper end flange 21, a filter cylinder side wall 22, an oil inlet flange 23, a filter element fixing steel pipe 24, an oil passing hole 25, a spring 26, an end cover 27, a bubble adsorption cylinder 40, a through hole 41, a rough surface structure 42, an oil return filter element 50 and an oil return steel pipe 31.

Detailed Description

The following description of the embodiments refers to the accompanying drawings.

As shown in fig. 1, the hydraulic oil tank in this embodiment includes a tank 10, a partition plate 11 that partitions an inner cavity of the tank into an oil return cavity and an oil suction cavity is disposed in the tank 10, and a defoaming filter device 2 is disposed in the oil return cavity.

As shown in fig. 2, fig. 3 and fig. 4, the defoaming filtering device 2 includes an oil return filter cartridge 20 and an oil return filter element 50 fixedly installed inside the oil return filter cartridge 20, and the oil return filter cartridge 20 includes an upper end flange 21, a cartridge base and a cartridge side wall 22. The cartridge side wall 22 is cylindrical, and has an upper end fixedly connected to the upper end flange 21 and a lower end fixedly connected to the cartridge base.

As shown in fig. 3, the base of the filter cartridge comprises a bottom plate 28, a filter element fixing steel pipe 24 and an oil inlet flange 23, wherein the bottom plate 28 is fixedly connected with the side wall of the filter cartridge at the peripheral edge, the filter element fixing steel pipe 24 penetrates through the middle of the bottom plate 28 from bottom to top and is welded with the bottom plate, the oil inlet flange 23 is fixed at the lower end of the filter element fixing steel pipe 24, and the oil return inlet is arranged on the oil inlet flange 23 and is communicated with the filter element fixing steel pipe 24.

As shown in fig. 4, the lower end of the oil return filter element 50 is inserted and sleeved on the filter element fixing steel pipe 24, and the upper end is pressed on the end cover 27 at the upper end of the oil return filter element through the spring 26, so that the oil return filter element is fixed.

And a bubble adsorption cylinder 40 is arranged on the outer side of the oil return filter element 50, and vertical oil passing chambers are respectively arranged between the bubble adsorption cylinder 40 and the filter cylinder side wall 22 of the oil return filter element 50 and the oil return filter cylinder 20. The vertical oil passing cavity between the bubble adsorption cylinder 40 and the oil return filter element 50 is a first cavity B, and the vertical oil passing cavity between the bubble adsorption cylinder 40 and the filter cylinder side wall 22 of the oil return filter cylinder is a second cavity C.

The bubble adsorption cylinder 40 is cylindrical, the upper end of the bubble adsorption cylinder is fixedly connected with the upper end flange 21 of the oil return filter cylinder, and the lower end of the bubble adsorption cylinder is connected with the filter cylinder base of the oil return filter cylinder; the bubble adsorption cylinder 40 is provided with oil hole groups communicating with both sides thereof, and the inner wall surface and the outer wall surface of the bubble adsorption cylinder are of a rough surface structure for adsorbing bubbles.

As shown in FIG. 5, the oil through hole group of the bubble adsorption cylinder 40 is formed by arranging through holes 41 with a hole diameter of 5mm-20mm in an array in an area above the middle of the bubble adsorption cylinder. The average height of the oil through hole groups on the bubble adsorption cylinder 40 is higher than the height of the center position of the oil return filter element and the average height of the oil through hole groups on the side wall of the filter cylinder.

As shown in FIG. 3, the oil passing hole group on the side wall 22 of the filter cartridge is composed of oil passing holes 25 with a hole diameter of 3mm-5mm arranged below the middle part of the side wall of the filter cartridge, and the average height of the oil passing holes in the oil passing hole group on the side wall 22 of the filter cartridge is lower than the average height of the oil passing hole group on the bubble adsorption cartridge.

The inner wall surface and the outer wall surface of the bubble adsorbing cylinder 40 are rough surface structures 42 for adsorbing bubbles, and as shown in fig. 6, the inner wall surface and the outer wall surface of the bubble adsorbing cylinder are provided with pits or projections having a radial size of 0.1mm to 2 mm. The rough surface structure 42 may be formed of a filter net fixed to the wall surface of the bubble adsorption cylinder or a perforated plate fixed to the wall surface of the bubble adsorption cylinder, and the diameter of the holes in the perforated plate is 0.1mm to 2 mm.

The oil inlet flange 23 is provided with two oil return inlets which are communicated with the filter element fixing steel pipe. As shown in fig. 1 and fig. 2, two oil return steel pipes 31 are fixedly connected to the base of the filter cartridge, a first end of each oil return steel pipe 31 is communicated with an oil return inlet on the oil inlet flange 23, and second ends of the two oil return steel pipes 31 are respectively fixed to two mutually perpendicular side walls of the box body 10. The oil return steel pipes 31 not only play a role in oil circuit connection, but also play a role in supporting and fixing the lower end of the defoaming filtering device, and the two oil return steel pipes fix the lower end of the defoaming filtering device from two directions, so that the lower end of the defoaming filtering device is prevented from shaking along with a device.

In the invention, the bubble adsorption cylinder 40 is arranged, and the action of adsorbing micro bubbles by the rough surface 42 on the surface of the bubble adsorption cylinder is utilized to gather and combine the small bubbles to form large bubbles, so that the large bubbles are easier to float out of the liquid surface, and the defoaming of the oil liquid is realized; the oil liquid discharged from the inner cavity A of the oil return filter element 50 sequentially passes through the first cavity B, the second cavity C and the oil return cavity D, so that the flowing time of the oil liquid is prolonged, bubbles are discharged from the liquid level, and defoaming is further realized; resistance is generated in a certain space through the resistance action of the oil hole group, and the flowing speed of the vacuole group to the downstream is slowed down, so that the upstream bubbles float for a longer time; in the oil return filter element, the oil return mode is from bottom to top, no impact exists, on one hand, the initial upward flowing direction is provided for bubbles, on the other hand, the speed of the bubbles entering the oil tank in group flow is reduced, the disturbance and the vortex in the oil tank are effectively reduced, and the upward floating of the bubbles is facilitated. The method integrates the above aspects, effectively integrates various methods, provides a plurality of convenient conditions for merging, gathering and floating of bubbles, achieves the purpose of defoaming the structure of the hydraulic oil tank, and effectively reduces the defoaming cost of the hydraulic system.