Oil return filter cartridge of hydraulic oil tank

Abstract

The utility model relates to the technical field of hydraulic oil tanks, and provides an oil return filter cartridge of a hydraulic oil tank, which comprises a pair of oil filter cartridges, namely oil return filter mounting cartridges, the two oil filter cartridges are communicated through two connecting pipes, an oil outlet pipe is arranged below the oil filter cartridges, the oil outlet pipe and the oil filter cartridges are integrally arranged, and a plurality of buffer holes are uniformly distributed on the side wall of the oil outlet pipe. The side wall of the oil outlet pipe is porous, impact on hydraulic oil in the oil tank is reduced, and bubbles generated by impact can be effectively reduced; meanwhile, the structure can reduce the rolling amplitude of oil, the whole hydraulic oil movement is small, and the risk of oil leakage of the breather valve caused by rolling of the hydraulic oil is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil tanks, and particularly relates to an oil return filter cartridge for a hydraulic oil tank. Background Art

[0002] A hydraulic oil tank is an important component of a construction machinery hydraulic system. A filtering device is installed inside it to filter the return oil of the hydraulic system. The hydraulic oil tank also stores, defoams, and aids in heat dissipation of the hydraulic oil.

[0003] Regarding the existing oil return filter cartridge in the hydraulic oil tank, the utility model inventor found the following technical problems:

[0004] Figure 1 For the existing structure of the oil return filter cartridge, at present, only the upper part of the oil return filter cartridge of the hydraulic oil tank of an excavator is fixed, and the lower part is in a suspended state, there is a risk of shaking, and the fixing position of the upper cover plate is subjected to greater stress;

[0005] In addition, due to the impact of the oil fluid, and the lower oil outlet is large and has a certain height, it will generate a certain impact on the oil fluid, generate bubbles, the hydraulic oil inside the oil tank rolls greatly, and will rush to the upper cover plate of the oil tank. Since a breather valve is installed on the upper cover plate, when the oil rushes to the upper cover plate, oil leakage will occur at the breather valve. Content of the Utility Model

[0006] The purpose of the utility model is to provide an oil return filter cartridge for a hydraulic oil tank, which can solve the technical problem of internal impact of the existing hydraulic oil tank.

[0007] To achieve the above purpose, the utility model provides an oil return filter cartridge for a hydraulic oil tank, including a pair of oil filter cartridges, namely an oil return filter installation cylinder, and the two oil filter cartridges are communicated by two connecting pipes. An oil outlet pipe is arranged below the oil filter cartridge, and the oil outlet pipe is integrally arranged with the oil filter cartridge. A plurality of buffer holes are evenly distributed on the side wall of the oil outlet pipe.

[0008] It is further set that the oil filter cartridge of the oil return filter cartridge is welded to the first flange penetrating the oil tank cover plate, and the oil return filter cartridge is fixed to the hydraulic oil tank cover plate in a welding form through the first flange.

[0009] It is further set that two breather valves are installed on the cover plate corresponding to the oil suction chamber side of the hydraulic oil tank.

[0010] It is further set that the end of the oil outlet pipe is welded to the second flange as a whole.

[0011] It is further set that the oil outlet pipe fixes the oil return filter cartridge to the hydraulic oil tank bottom plate in a welding form through the second flange.

[0012] It is further set that the filter cartridges are communicated through the connecting pipes. Two connecting pipes are provided, and the connecting pipes are arranged in parallel with each other.

[0013] Further set that the diameter of the oil return filter cartridge outlet pipe is smaller than that of the oil filter cartridge, and the diameter of the outlet pipe is about half of the diameter of the oil filter cartridge.

[0014] Further set that the length of the outlet pipe is greater than that of the oil filter cartridge, and the area of the region where the buffer holes are opened is located in the lower half of the outlet pipe.

[0015] Further set that a partition plate is vertically installed on one side of the outlet pipe, dividing the interior of the hydraulic oil tank into an oil suction chamber and an oil return chamber.

[0016] Further set that the cross-section of the partition plate is V-shaped.

[0017] Advantages of the above one or more technical solutions:

[0018] (1) The overall length of the oil return filter cartridge is extended to the bottom plate and fixed to the bottom plate. The bottom plate supports the filter cartridge, thereby reducing the force on the upper cover plate of the fuel tank, avoiding the oil return filter cartridge being suspended, and making the overall structure more stable.

[0019] (2) The lower outlet pipe of the present utility model adopts a side wall multi-hole design, which reduces the impact on the hydraulic oil in the fuel tank, can effectively reduce the bubbles generated by the impact; at the same time, adopting this structure can reduce the rolling amplitude of the oil fluid, the overall movement of the hydraulic oil is small, and effectively avoid the risk of oil leakage from the breather valve caused by the rolling of the hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0021] Figure 1 It is a schematic structural diagram of the internal oil return filter cartridge of the existing hydraulic oil tank.

[0022] Figure 2 It is a schematic structural diagram of the present utility model.

[0023] In the figure, 1 is a breather valve; 2 is a first flange; 3 is a cover plate; 4 is an oil filter cartridge; 5 is a connecting pipe; 6 is an outlet pipe; 7 is a partition plate; 8 is a second flange; 9 is a bottom plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following describes the specific implementation manners of this embodiment in conjunction with the attached Figure 1 , and illustrates the specific implementation manners of this embodiment.

[0025] Refer to Figure 2, a hydraulic oil tank return oil filter cartridge, including a pair of oil filter cartridges 4, namely the return oil filter installation cartridges, and the two oil filter cartridges are connected by two connecting pipes 5. An oil outlet pipe 6 is arranged below the oil filter cartridge. The oil outlet pipe 6 is integrally arranged with the oil filter cartridge 4. A plurality of buffer holes are evenly distributed on the side wall of the oil outlet pipe 6. The oil outlet pipe 6 adopts a porous side wall design to reduce the impact on the hydraulic oil in the oil tank and can effectively reduce the bubbles generated by the impact;

[0026] The buffer holes of this device are circular holes arranged in multiple rows evenly. When the hydraulic oil flows in, the oil can be dispersed through multiple circular holes to reduce the impact force of the oil, and at the same time, this structure can reduce the rolling amplitude of the oil. The overall movement of the hydraulic oil is small, effectively avoiding the risk of oil leakage from the breather valve 1 caused by the rolling of the hydraulic oil.

[0027] Refer to Figure 2 , a cover plate 3 is arranged at the top end of the hydraulic oil tank. The upper end of the oil filter cartridge 4 is fixedly connected to the cover plate 3 through a first flange 2 and is fixed on the outer wall of the cover plate 3. The cover plate 3 arranged above the hydraulic oil tank provides an installation space for the first flange 2 of the return oil filter cartridge.

[0028] Two breather valves 1 are installed on the cover plate 3 corresponding to the oil suction cavity of the hydraulic oil tank. The breather valves 1 are of the existing type. The breather valves 1, as ventilation devices, play the role of reducing the evaporation loss of oil products, controlling the pressure of the storage tank, maintaining pressure balance, and at the same time preventing external flames from entering.

[0029] Refer to Figure 2 , a bottom plate 9 is arranged at the bottom end of the hydraulic oil tank. The oil outlet pipe 6 is fixedly connected to the bottom plate 9 through a second flange 8. Refer to Figure 1 For the existing return oil filter cartridge of the hydraulic oil tank, only the oil filter cartridge 4 is fixed at the upper part, and the lower oil outlet pipe 6 is suspended, resulting in a cantilever structure at the intersection of the oil filter cartridge 4 and the cover plate 3. There is a risk of shaking for the whole return oil filter cartridge, and the fixing position of the upper cover plate 3 is under greater stress.

[0030] The end of the oil outlet pipe 6 is fixedly connected to the bottom plate 9 of the hydraulic oil tank in a welding form through the second flange 8, forming a rigid connection among the oil outlet pipe 6, the second flange 8 and the oil tank bottom plate.

[0031] The oil filter cartridges 4 are connected by a connecting pipe 5. Two connecting pipes 5 are provided, and the two connecting pipes are arranged parallel to each other to connect the two oil filter cartridges 4, forming a communicating vessel to ensure that the oil output of the two oil filter cartridges 4 is the same, and avoid the pressure imbalance caused by more oil on one side and less oil on the other side, resulting in oil rolling.

[0032] A partition plate 7 is vertically installed on one side of the oil outlet pipe 6 and located inside the hydraulic oil tank. The partition plate 7 is a thin plate with a V-shaped cross-section, which divides the oil suction filter and the oil return filter cartridge inside the hydraulic oil tank, and divides the hydraulic oil tank into an oil suction chamber and an oil return chamber, avoiding the influence of the oil fluid movement brought by the oil return on the oil suction, ensuring that the oil fluid on the oil suction side remains stable. In addition, because the hydraulic oil is blocked by the partition plate 7 after tumbling in the hydraulic oil tank, the tumbling amplitude of the oil fluid can be reduced.

[0033] The buffering process of the hydraulic oil is as follows:

[0034] Refer to Figure 2 , in order to buffer the impact of the hydraulic oil, the diameter of the oil outlet pipe 6 is smaller than that of the oil filter cartridge 4. The diameter of the oil outlet pipe 6 is about half of the diameter of the oil filter cartridge 4. The smaller oil outlet diameter reduces the impact range of the hydraulic oil in the hydraulic oil tank; the length of the oil outlet pipe 6 is greater than that of the oil filter cartridge 4, which can effectively reduce the further pressurization of the hydraulic oil caused by the hydraulic oil flowing from a larger-diameter cavity into a smaller-diameter cavity, avoiding excessive pressure and large oil fluid fluctuations generated by the impact on the liquid surface. The area of the region where the buffer holes are opened is located in the lower half of the oil outlet pipe 6. After the hydraulic oil flows from the oil filter cartridge 4 downward into the oil outlet pipe 6, the hydraulic oil is dispersed and extruded through a plurality of buffer holes, avoiding the direct downward flow of the hydraulic oil, reducing the impact of the hydraulic oil. At the same time, after the bottom plate 9 of the present application and the oil outlet pipe 6 are fixed by the second flange 8, the cantilever setting of the existing oil outlet pipe 6 is optimized.

[0035] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A hydraulic oil tank return oil filter cartridge, characterized in that: It comprises a pair of oil filter cylinders, namely, return oil filter mounting cylinders, and the two oil filter cylinders are connected by two connecting pipes, an oil outlet pipe is arranged below the oil filter cylinder, the oil outlet pipe is integrally arranged with the oil filter cylinder, and a plurality of buffer holes are evenly distributed on the side wall of the oil outlet pipe.

2. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: The oil return filter cartridge is welded to a first flange penetrating the oil tank cover plate as a whole, and the oil return filter cartridge is fixed to the hydraulic oil tank cover plate by welding through the first flange.

3. The hydraulic oil tank return oil filter cartridge according to claim 2, characterized in that: A breathing valve is installed on the cover plate at the side corresponding to the oil suction cavity of the hydraulic oil tank, and two breathing valves are provided.

4. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: The end of the oil outlet pipe is welded to the second flange as a whole.

5. The hydraulic oil tank return oil filter cartridge according to claim 4, characterized in that: The oil outlet pipe is fixed to the return oil filter cartridge and the bottom plate of the hydraulic oil tank by welding through the second flange.

6. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: The filter cartridges are connected to each other via a connecting pipe, wherein two connecting pipes are provided and the connecting pipes are arranged parallel to each other.

7. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: The diameter of the oil outlet pipe of the oil return filter cartridge is smaller than that of the oil filter cartridge, and the diameter of the oil outlet pipe is approximately half of the diameter of the oil filter cartridge.

8. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: The length of the oil outlet pipe is greater than that of the oil filter cartridge, and the area where the buffer hole is opened is located in the lower half of the oil outlet pipe.

9. The hydraulic oil tank return oil filter cartridge according to claim 1, characterized in that: A partition is vertically installed on one side of the oil outlet pipe to divide the interior of the hydraulic oil tank into an oil suction chamber and an oil return chamber.

10. The hydraulic oil tank return oil filter cartridge according to claim 9, characterized in that: The partition has a V-shaped cross section.

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