An oil return filter

Abstract

The utility model discloses an oil return filter, including filter shell, the inside intermediate of filter shell is provided with filter core, the lower extreme of filter core is provided with lower end connecting ring, and the upper end of filter core is provided with upper filter core end cover, and the middle of upper filter core end cover is provided with through -hole, and the inboard of this through -hole is installed with pressure safety assembly, the upper end sealed cover is sealed to filter shell's upper end, and the upper end sealed cover is provided with the compression spring between upper filter core end cover, and the filter core is fixedly pressed by compression spring, and the liquid inlet cavity is formed between filter core and filter shell, and the upper end of one side of filter shell is provided with the liquid inlet joint of communication with liquid inlet cavity, the lower extreme of filter shell is provided with liquid outlet joint, simple structure, easy operation, not only can install the device fast, when filter core is blocked, can carry out safety protection, and can avoid the pressure difference of import and export too big, and the use effect is better.

Description

Technical Field

[0001] This utility model relates to the field of oil return filter technology, specifically an oil return filter. Background Technology

[0002] The return oil filter is installed on the return oil line of the system. Its function is to capture contaminants generated or entering the system before returning to the oil tank. The existing return oil filter has a complex structure and can only perform filtration. Moreover, it is not convenient to use when the installation speed is slow and the filter element is easily damaged when the pressure difference is too large. It does not have a safety protection function. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a return oil filter with simple structure and easy operation. It can not only be installed quickly, but also provide safety protection when the filter element is clogged. In addition, it can avoid excessive pressure difference between the inlet and outlet, and has better performance. It can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an oil return filter, comprising a filter housing, a filter element disposed in the middle of the interior of the filter housing, a lower end connecting ring disposed at the lower end of the filter element, and an upper filter element end cap disposed at the upper end of the filter element, a through hole disposed in the middle of the upper filter element end cap, a pressure safety component installed inside the through hole, an upper sealing cap sealingly connected to the upper end of the filter housing, a compression spring disposed between the upper sealing cap and the upper filter element end cap, the compression spring pressing and fixing the filter element, a liquid inlet chamber formed between the filter element and the filter housing, a liquid inlet connector communicating with the liquid inlet chamber disposed on one upper side of the filter housing, and a liquid outlet connector disposed at the lower end of the filter housing.

[0005] Furthermore, the upper surface of the upper filter element end cap and the lower surface of the upper sealing cap are both provided with positioning grooves, which position the two ends of the compression spring.

[0006] Furthermore, the lower connecting ring has a U-shaped cross-section, and a rubber sealing ring is provided between the lower surface of the lower connecting ring and the inner bottom surface of the filter housing. The rubber sealing ring makes the connection between the lower end of the filter element and the inner bottom surface of the filter housing tighter, thereby preventing unfiltered liquid from flowing out from the gap between the filter housing and the filter element, resulting in better filtration effect.

[0007] Furthermore, the pressure safety component includes a mounting ring fixed to the upper end of the through hole of the upper filter element end cap. A lower end cap is provided below the mounting ring, and an annular connecting frame is provided between the mounting ring and the lower end cap. A pushing spring is fixed to the upper surface of the lower end cap, and a pressure plug is connected to the upper end of the pushing spring. The upper end of the pressure plug has a conical structure, and the upper end of the pressure plug is sealed to the inner side of the lower end of the mounting ring. When the filter element causes blockage of the filter holes, the liquid pressure difference between the liquid inlet and the liquid outlet will be too large. The pressure plug will be moved downward by hydraulic pressure, and at the same time, the spring will be pushed to retract. A gap will appear between the pressure plug and the mounting ring, so that the liquid in the liquid inlet can pass through the upper end of the filter element and be discharged from the liquid outlet.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: the rubber sealing ring makes the connection between the lower end of the filter element and the inner bottom surface of the filter housing tighter, thereby preventing unfiltered liquid from flowing out from the gap between the filter housing and the filter element, resulting in better filtration. When the filter element causes blockage of the filter holes, it will cause an excessive difference in liquid pressure between the inlet and outlet joints. The hydraulic pressure will push the pressure plug downward and simultaneously push the spring retractor, creating a gap between the pressure plug and the mounting ring. This allows the liquid from the inlet joint to pass through the upper end of the filter element and be discharged from the outlet joint. This return oil filter has a simple structure and is easy to operate. It not only allows for quick installation of the device and provides safety protection when the filter element is blocked, but also avoids excessive pressure difference between the inlet and outlet, resulting in better performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged structural diagram of point A in this utility model.

[0010] In the diagram: 1. Upper sealing cap, 2. Compression spring, 3. Pressure safety component, 31. Lower connecting end cap, 32. Pushing spring, 33. Pressure plug, 34. Annular connecting bracket, 35. Mounting connecting ring, 4. Upper filter element end cap, 5. Filter element, 6. Filter housing, 7. Lower connecting ring, 8. Rubber sealing ring, 9. Liquid outlet connector, 10. Liquid inlet connector. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] Please see Figure 1-2 This utility model provides a technical solution: a return oil filter, including a filter housing 6, a filter element 5 disposed in the middle of the filter housing 6, a lower end connecting ring 7 disposed at the lower end of the filter element 5, and an upper filter element end cap 4 disposed at the upper end of the filter element 5. A through hole is disposed in the middle of the upper filter element end cap 4, and a pressure safety component 3 is installed inside the through hole. An upper sealing cover 1 is sealed to the upper end of the filter housing 6, and a compression spring 2 is disposed between the upper sealing cover 1 and the upper filter element end cap 4. The compression spring 2 presses and fixes the filter element 5, forming an inlet chamber between the filter element 5 and the filter housing 6. A liquid inlet connector 10 communicating with the liquid inlet chamber is provided on the upper side of one side of the filter housing 6, and a liquid outlet connector 9 is provided on the lower end of the filter housing 6. Positioning grooves are provided on the upper surface of the upper filter element end cap 4 and the lower surface of the upper sealing cap 1, which position the two ends of the compression spring 2. The lower connecting ring 7 has a U-shaped cross-section, and a rubber sealing ring 8 is provided between the lower surface of the lower connecting ring 7 and the inner bottom surface of the filter housing 6. The rubber sealing ring 8 ensures a tighter connection between the lower end of the filter element 5 and the inner bottom surface of the filter housing 6, thereby preventing unfiltered liquid from flowing out. The filter housing 6 and the filter element 5 leak out through the gap, resulting in better filtration. The pressure safety component 3 includes a mounting ring 35 fixed to the upper end of the through hole of the upper filter element end cap 4. A lower end cap 31 is provided below the mounting ring 35. An annular connecting frame 34 is provided between the mounting ring 35 and the lower end cap 31. A pushing spring 32 is fixed to the upper surface of the lower end cap 31. A pressure plug 33 is connected to the upper end of the pushing spring 32. The upper end of the pressure plug 33 has a conical structure, and the upper end of the pressure plug 33 is sealed to the inner side of the lower end of the mounting ring 35. When the filter... When filter element 5 causes blockage of the filter holes, the pressure difference between the liquid at the inlet connector 10 and the liquid at the outlet connector 9 becomes too large. The hydraulic pressure pushes the pressure plug 33 downward, simultaneously pushing the spring 32 to retract. A gap appears between the pressure plug 33 and the mounting ring 35, allowing the liquid from the inlet connector 10 to flow out from the top of filter element 5 through the outlet connector 9. This return oil filter has a simple structure and is easy to operate. It not only allows for quick installation of the device and provides safety protection when filter element 5 is blocked, but also avoids excessive pressure difference between the inlet and outlet, resulting in better performance.

[0013] During use: The rubber sealing ring 8 makes the lower end of the filter element 5 more tightly connected to the inner bottom surface of the filter housing 6, thereby preventing unfiltered liquid from flowing out from the gap between the filter housing 6 and the filter element 5, resulting in better filtration. When the filter element 5 causes blockage of the filter holes, the liquid pressure difference between the inlet connector 10 and the outlet connector 9 will be too large. The hydraulic pressure will push the pressure plug 33 downward and push the spring 32 to retract. A gap will appear between the pressure plug 33 and the mounting ring 35, so that the liquid from the inlet connector 10 will pass through the upper end of the filter element 5 and be discharged from the outlet connector 9.

[0014] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A return oil filter, comprising a filter housing (6), characterized in that: The filter housing (6) has a filter element (5) in the middle inside. The filter element (5) has a lower connecting ring (7) at its lower end and an upper filter element end cap (4) at its upper end. The upper filter element end cap (4) has a through hole in the middle. A pressure safety component (3) is installed inside the through hole. The filter housing (6) has an upper sealing cover (1) at its upper end. A compression spring (2) is provided between the upper sealing cover (1) and the upper filter element end cap (4). The compression spring (2) presses and fixes the filter element (5). A liquid inlet chamber is formed between the filter element (5) and the filter housing (6). A liquid inlet connector (10) communicating with the liquid inlet chamber is provided on the upper side of one side of the filter housing (6). A liquid outlet connector (9) is provided at the lower end of the filter housing (6).

2. The oil return filter according to claim 1, characterized in that: The upper surface of the upper filter element end cap (4) and the lower surface of the upper sealing cap (1) are both provided with positioning grooves, which position the two ends of the compression spring (2).

3. The oil return filter according to claim 1, characterized in that: The lower connecting ring (7) has a U-shaped cross-section, and a rubber sealing ring (8) is provided between the lower surface of the lower connecting ring (7) and the inner bottom surface of the filter housing (6).

4. The oil return filter according to claim 1, characterized in that: The pressure safety component (3) includes an installation connecting ring (35) fixed to the upper end of the through hole of the upper filter element end cap (4). A lower end connecting cap (31) is provided below the installation connecting ring (35). An annular connecting frame (34) is provided between the installation connecting ring (35) and the lower end connecting cap (31). A jacking spring (32) is fixed on the upper surface of the lower end connecting cap (31). A pressure plug (33) is connected to the upper end of the jacking spring (32). The upper end of the pressure plug (33) has a conical structure, and the upper end of the pressure plug (33) is sealed to the inner side of the lower end of the installation connecting ring (35).

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