A filter for a new energy automobile battery cooler

Abstract

This application relates to the field of filter technology, and in particular to a filter for a battery cooler in a new energy vehicle. The filter includes a cavity seat, an outer cover threaded onto the cavity seat, and a filter element disposed within the cavity seat. An inlet and an outlet are provided on the side wall of the cavity seat. Liquid entering through the inlet flows through the filter element and exits through the outlet. A limiting ring is fixed to the side wall of the end cap of the filter element, and a first limiting block is fixed to the side wall of the limiting ring. A blocking ring is fixed to the inner wall of the outer cover, and a second limiting block is fixed to the side wall of the blocking ring. The side wall of the first limiting block can abut against the side of the second limiting block facing the bottom wall of the outer cover. A turning handle is fixed to the outer wall of the outer cover. This application improves the stability of the connection between the filter element and the outer cover, and provides convenience for the installation and removal of the filter element.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of filters, in particular to a filter for a new energy automobile battery cooler. BACKGROUND

[0002] The battery of an electric automobile is a core component of the automobile as a power source, and a large amount of heat is generated in the battery during use, so that the temperature inside the battery continuously rises; if the heat is not released in time, the service life of the battery will be shortened, and even a safety hazard will be caused. At present, the commonly used cooling method for the battery of an electric automobile is oil cooling, so a filter needs to be provided.

[0003] A filter disclosed in CN109865344A comprises a cavity seat and a cavity cover threadedly connected to the cavity seat, a cavity is formed between the cavity seat and the cavity cover, a first filter screen and a second filter screen are clamped and fixed to the inner wall of the cavity, a liquid inlet and a liquid outlet are formed in the side wall of the cavity cover, oil liquid to be filtered is introduced into the liquid inlet, and then enters the first filter screen, and then enters the cavity formed between the cavity cover and the cavity seat under the double filtration of the first filter screen and the second filter screen, and then flows out through the liquid outlet. When the staff needs to remove the first filter screen and the second filter screen and clean the first filter screen and the second filter screen, the cavity seat is loosened, and the first filter screen and the second filter screen are pulled out by a tool or manually.

[0004] When the first filter screen and the second filter screen in the filter need to be cleaned or the first filter screen or the second filter screen needs to be replaced, the first filter screen and the second filter screen are pulled out after the cavity seat is loosened, and the hand or the tool needs to be inserted into the inner cavity between the cavity seat and the cavity cover. Due to the lubricating effect of the oil liquid, the first filter screen and the second filter screen are affected in the process of being pulled out, and there is room for improvement. SUMMARY

[0005] In order to reduce the interference caused by the oil liquid remaining in the filter to the disassembly of the filter core due to the slipping of the oil liquid adhered to the outer wall of the filter core during the disassembly of the filter core, the application provides a filter for a new energy automobile battery cooler.

[0006] The application provides a filter for a new energy automobile battery cooler, which adopts the following technical scheme:

[0007] The utility model provides a filter for new energy automobile battery cooler, including cavity seat, the outer cover of screwing on cavity seat and the filter core of setting in cavity seat, the side wall of cavity seat is equipped with liquid inlet and liquid outlet, the liquid of entering liquid inlet flows from liquid outlet through filter core, the side wall of end cover of filter core is fixed with limit ring, the side wall of limit ring is fixed with first limit block, the inner wall of outer cover is fixed with blocking ring, the side wall of blocking ring is fixed with second limit block, the side wall of first limit block can be with second limit block and the one side of bottom wall of outer cover abuts, the outer wall of outer cover is fixed with the handle of twisting.

[0008] Through adopting the technical scheme, in the process of assembling the filter core, the end of the filter core close to the limit ring is inserted into the outer cover in advance, so that the side walls of the first limit block and the second limit block abut, the filter core is fixed with the outer cover under the limiting of the blocking ring and the second limit block, the end of the filter core away from the outer cover is inserted into the wall seat, the outer cover is screwed on the cavity seat by rotating the handle of twisting, and the assembly of the filter is completed; when it is necessary to clean the impurities in the filter or replace the filter core, etc., the handle of twisting is directly rotated, the filter core is separated from the cavity seat under the limiting of the first limit block and the second limit block, and the worker does not need to contact the parts inside the filter, so that the interference caused by the oil in the filter to the removal of the filter core is reduced.

[0009] Optionally, the outer wall of the filter core is fixed with a positioning block, and the side wall of the blocking ring is provided with a groove.

[0010] By adopting the above technical scheme, after the filter core is fixed on the outer cover, the positioning block is fixed in the groove, so that the relative rotation between the filter core and the outer cover during the rotation of the handle of twisting is avoided, and the connection between the filter core and the outer cover is more stable.

[0011] Optionally, the side wall of the end cover of the filter core is detachably connected with a connecting frame, the connecting frame is located at the position of the liquid outlet, the inner wall of the connecting frame is fixed with a mounting frame by clamping, the inner wall of the mounting frame is provided with a positioning groove, the inner wall of the positioning groove is fixed with a sealing coil by clamping, and the sealing coil abuts against the side wall of the cavity seat.

[0012] By adopting the above technical scheme, the sealing coil is fixed in the positioning groove, the mounting frame is clamped on the inner wall of the connecting frame, and finally the connecting frame is fixed on the end cover of the filter core, the sealing coil is arranged to seal the connecting part between the filter core and the cavity seat, so that the possibility of leakage of the oil in the filter between the filter core and the cavity seat is reduced.

[0013] Optionally, a plurality of clamping grooves are formed in the outer wall of the outer cover, and a sealing ring is clamped and fixed to the inner wall of each clamping groove.

[0014] By adopting the above technical scheme, in the process of assembling the filter, the sealing ring is clamped and fixed in the clamping groove in advance, the sealing ring seals the connection between the outer cover and the cavity seat, reduces the possibility of leakage between the outer cover and the cavity seat, and the plurality of clamping grooves are formed to enable the outer cover and the cavity seat to be sealed in multiple layers. With the material of the cavity seat, the cavity seat has the possibility of corrosion, and the outer cover and the cavity seat are better sealed by adopting multiple layers of sealing, thereby reducing the possibility of oil leakage caused by corrosion.

[0015] Optionally, the filter element comprises a skeleton and filter paper sleeved on the outer wall of the skeleton, the end cover of the filter element is arranged at the end of the skeleton, a rotating disc is rotatably connected to the end cover at both ends of the filter element, a plurality of guide grooves are formed in the end cover of the filter element, a plurality of guide rods are slidably connected to the side wall of the rotating disc, a resilient member is arranged on the outer wall of the rotating disc to enable the end of the guide rod to abut against the inner wall of the guide groove, a guide pin is fixed to the outer wall of the guide rod, the guide pin is fixedly connected with the filter paper, the skeleton is fixedly connected with the rotating disc, and a driving assembly for driving the skeleton to rotate is arranged on the outer cover.

[0016] By adopting the above technical scheme, according to the concentration and pressure of the oil to be filtered, the driving assembly is started, the driving assembly drives the skeleton to rotate, the skeleton drives the rotating disc to rotate, the guide rod slides under the guidance of the guide groove and the resilience of the resilient member, the guide rod drives the guide pin to move, and the guide pin drives the filter paper to move, so that the diameter of the filter paper changes and the gap between the filter papers changes, thereby facilitating the filtration of different oil.

[0017] Optionally, the outer cover is hollow, the driving assembly comprises a driving ring rotatably arranged on the inner wall of the outer cover and a resilient member arranged on the outer cover for limiting the rotation of the driving ring, and the driving ring is fixedly connected with the end cover of the filter element through the resilient member.

[0018] By adopting the above technical scheme, the worker presses the driving ring into the inner cavity of the outer cover, rotates the driving ring, and drives the skeleton to rotate, thereby driving the rotating disc to rotate. After adjusting the filter paper, the driving ring is loosened, and the driving ring abuts against the inner wall of the outer cover under the self-resilience of the resilient member, thereby reducing the possibility of self-rotation of the driving ring, and reducing the change in the diameter of the filter paper during filtration.

[0019] Optionally, a positioning frame is fixed to the end cover of the filter element, the positioning frame abuts against the inner wall of the filter paper, and a tensioning surface is formed in the side wall of the positioning frame.

[0020] By adopting the technical scheme, the positioning frame is arranged to support the filter paper, so that the filter paper has good stability, and when the diameter of the filter paper is adjusted, the tensioning surface guides and supports the filter paper, so that the fixing of the filter paper is more stable.

[0021] Optionally, a filter screen is arranged on the end cover of the filter core, and the filter screen is located at the position of the liquid outlet.

[0022] By adopting the technical scheme, the filter screen is fixed on the end cover of the filter core according to the concentration and pressure of the oil liquid flowing into the filter, the oil liquid is filtered through the filter paper and then filtered through the filter screen, and finally flows out from the liquid outlet, so that the oil liquid is filtered more completely.

[0023] To sum up, the present application has at least one of the following beneficial technical effects:

[0024] 1. The worker inserts the end of the filter core into the outer cover, the first limiting block and the second limiting block are in contact, the second limiting block is clamped on the first limiting block under the guidance of the first limiting block, so that the filter core is fixed on the outer cover, the outer cover is threadedly connected to the cavity seat by rotating the screw handle, and the assembly of the filter is completed; when it is necessary to clean the inner cavity of the filter or replace the filter core, only the outer cover needs to be loosened, and the filter core is taken out from the cavity seat through the outer cover, so that the filter core is directly taken out, the oil liquid on the outer wall of the filter core does not interfere with the taking of the filter core, and the disassembly of the filter core is more convenient.

[0025] 2. When the concentration of the oil liquid to be filtered is large, the skeleton is rotated by rotating the driving ring, the rotating disc is rotated by the skeleton, the guide rod is moved under the action of the self-rebound force of the elastic member, the guide pin is moved by the guide rod, the filter paper is moved by the guide pin, the edge of the filter paper is moved to the middle position of the end cover of the filter core, so that the diameter of the filter paper is reduced, and the oil liquid is filtered more completely; when the concentration of the oil liquid to be filtered is small, the filter paper is moved to the convenient position of the end of the filter core, so that the diameter of the filter paper is increased, the oil liquid is conveniently passed, and different oil liquids are conveniently filtered. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the overall structure schematic view of the filter in the first embodiment of the present application.

[0027] Figure 2 is the cross-sectional view of the filter core in the first embodiment of the present application, used to show the layer structure of the filter core.

[0028] Figure 3 is the overall structure schematic view of the filter in the second embodiment of the present application.

[0029] Figure 4is a sectional view of the filter in Embodiment Two of the present application.

[0030] Figure 5 is a structure display diagram at the skeleton part in Embodiment Two of the present application.

[0031] Reference signs: 1, cavity seat; 2, outer cover; 3, filter element; 4, liquid inlet; 5, liquid outlet; 6, limiting ring; 7, first limiting block; 8, blocking ring; 9, second limiting block; 10, twisting handle; 11, positioning block; 12, connecting frame; 13, mounting frame; 14, positioning groove; 15, sealing coil; 16, clamping groove; 17, sealing ring; 31, skeleton; 32, filter paper; 18, rotating disc; 19, guide groove; 20, groove; 21, guide rod; 22, driving pin; 23, guide pin; 24, driving assembly; 241, driving ring; 242, elastic member; 25, positioning frame; 27, filter screen; 28, sealing ring. DETAILED DESCRIPTION

[0032] The following will be described in detail below with reference to the accompanying drawings. Figures 1-5 The present application will be further described in detail.

[0033] The present application discloses a filter for a new energy automobile battery cooler.

[0034] Embodiment One, with reference to Figure 1 and Figure 2 A filter for a new energy automobile battery cooler, comprising a cavity seat 1, the cavity seat 1 is hollowly arranged, the filter further comprises an outer cover 2 threadedly connected to the cavity seat 1, the outer side wall of the outer cover 2 is inwardly recessed, a twisting handle 10 is integrally formed on the inner wall of the outer cover 2, the twisting handle 10 is in the shape of a plum blossom, a staff clamps the twisting handle 10 by a twisting tool, rotates the twisting tool, the twisting tool drives the twisting handle 10 to rotate, thereby driving the outer cover 2 to rotate, so as to conveniently fix the outer shell on the cavity seat 1.

[0035] With reference to Figure 1 and Figure 2 The filter further comprises a filter element 3, the filter element 3 comprises a skeleton 31 and a filter paper 32 sleeved on the outer wall of the skeleton 31, end covers of the filter element 3 are welded and fixed at both ends of the skeleton 31, and the filter paper 32 is limited on the outer wall of the skeleton 31 under the limitation of the end covers of the filter element 3; in the present application, the cavity seat 1 is preferably made of aluminum material, a liquid inlet 4 is arranged on the side wall of the cavity seat 1, a liquid outlet 5 is arranged at the end of the cavity seat 1, the liquid outlet 5 is in communication with the middle cavity of the filter paper 32, oil is introduced into the inner cavity of the filter through the liquid inlet 4, and the oil flows out from the liquid outlet 5 after being filtered by the filter paper 32.

[0036] With reference to Figure 1 and Figure 2The outer wall of the outer cover 2 is provided with a plurality of clamping grooves 16, the number of the clamping grooves 16 is preferably two, and the inner wall of the clamping grooves 16 is clamped and fixed with a sealing ring 17. In the application, the sealing ring 17 is preferably supported by rubber material. The outer wall of the sealing ring 17 abuts against the inner wall of the cavity seat 1. The sealing ring 17 reduces the gap between the outer cover 2 and the cavity seat 1, thereby improving the sealing property between the outer cover 2 and the cavity seat 1 and reducing the possibility of oil leakage between the outer cover 2 and the cavity seat 1. In actual use, the cavity seat 1 has the possibility of corrosion. The outer cover 2 and the cavity seat 1 are better sealed in a multi-layer sealing manner, so that the sealing property of the filter is better.

[0037] Referring to Figure 1 and Figure 2 , the inner wall of the side of the outer cover 2 facing the inner cavity of the cavity seat 1 is welded and fixed with a blocking ring 8. The side of the blocking ring 8 facing the cavity seat 1 is welded and fixed with a second limiting block 9. The outer side edge of the second limiting block 9 is provided in a rounded corner. The outer wall of the end cover of the filter core 3 is welded and fixed with a limiting ring 6. The side of the limiting ring 6 away from the filter paper 32 is welded and fixed with a first limiting block 7. The edge position of the first limiting block 7 away from the filter paper 32 is provided in a rounded corner. The worker inserts the end cover of the filter core 3 into the outer cover 2. The first limiting block 7 is hung on the second limiting block 9 under the guidance of the first limiting block 7 and the second limiting block 9, so as to fix the filter core 3 on the outer cover 2.

[0038] Referring to Figure 2 , the end cover of the filter core 3 is welded and fixed with a positioning block 11. In the application, the positioning block 11 is preferably fixed with two. The side wall of the limiting ring 6 is provided with a groove 20. The groove 20 is provided in one-to-one correspondence with the positioning block 11. After the worker clamps and fixes the filter core 3 on the outer cover 2, the positioning block 11 is clamped in the corresponding groove 20. The outer cover 2 and the filter core 3 are relatively stationary in the circumferential direction under the blockage of the positioning block 11, so as to avoid relative rotation between the filter core 3 and the outer cover 2 in the process of rotating the outer cover 2.

[0039] Referring to Figure 2 , the outer cover 2 and the end cover of the filter core 3 are clamped with a sealing ring 28. In the application, the sealing ring 28 is preferably made of felt material. The sealing ring 28 is provided to isolate the oil in the filter, thereby reducing the possibility of oil in the filter seeping into the outer cover 2.

[0040] Referring to Figure 1 and Figure 2A connecting bracket 12 is bolted to the side wall of the end cap of filter element 3. The connecting bracket 12 is located near the liquid outlet 5. A mounting bracket 13 is snapped onto the inner wall of the connecting bracket 12. A positioning groove 14 is provided on the inner wall of the mounting bracket 13. A sealing coil 15 is snapped onto the inner wall of the positioning groove 14. The sealing coil 15 abuts against the side wall of the cavity seat 1, and the outer wall of the sealing coil 15 abuts against the outer wall of the pipe at the liquid outlet 5. The sealing coil 15 reduces the gap between the frame 31 and the cavity seat 1, thereby reducing the possibility of oil leakage.

[0041] According to Embodiment 1 of this application, the implementation principle of a filter for a new energy vehicle battery cooler is as follows: the oil in the cooler enters the filter through the inlet 4, passes through the filter paper 32, enters the inner cavity of the filter paper 32, and finally flows out through the outlet 5. During the assembly of the filter element 3, the worker inserts one end of the end cap of the filter element 3 into the outer cover 2, so that the first limiting block 7 and the second limiting block 9 abut against each other. Under the traction of the first limiting block 7 and the second limiting block 9, the filter element 3 is fixed on the outer cover 2. The filter element 3 is then inserted into the inner cavity of the cavity seat 1. The outer cover 2 is fixed on the cavity seat 1 by turning the handle 10, thereby realizing the assembly of the filter. When it is necessary to clean the impurities inside the filter, simply turn the handle 10 to separate the outer cover 2 from the cavity seat 1, avoiding contact with the filter element 3, thereby reducing the interference of oil on the disassembly of the filter element 3.

[0042] Example 2, Example 2 differs from Example 1 in that: Refer to Figure 4 and Figure 5 The end cap of filter element 3 has a mounting groove on its side wall. The two mounting grooves are opposite each other. A turntable 18 is rotatably connected in the mounting groove. A number of guide grooves 19 are evenly spaced on the inner wall of the end cap of filter element 3. The distance between the two ends of the guide groove 19 and the center position of the end face of filter element 3 is not equal. The guide grooves 19 are all located in the mounting groove. A number of guide rods 21 are evenly spaced on the outer wall of the turntable 18. The end of the guide rod 21 away from the turntable 18 abuts against the inner wall of the corresponding guide groove 19.

[0043] Reference Figure 5 A spring is provided between the outer wall of the turntable 18 and the guide rod 21, so that the end of the guide rod 21 abuts against the inner wall of the guide groove 19. In this application, the spring is preferably selected as the spring. One end of the spring is welded and fixed to the turntable 18, and the other end is welded and fixed to the end of the guide rod 21. During the rotation of the turntable 18, the spring and the guide rod 21 are driven to slide, and the end of the guide rod 21 is driven to slide to the end of the guide groove 19. Under the action of the spring's own rebound force, the end of the guide rod 21 always abuts against the inner wall of the guide groove 19.

[0044] Reference Figure 4 and Figure 5The outer wall of the guide rod 21 is welded with a guide pin 23, and the guide pin 23 is riveted with the folded corner of the filter paper 32; the two ends of the framework 31 are welded with the rotating disc 18 respectively, and the outer cover 2 is provided with a driving assembly 24 for driving the framework 31 to rotate, the driving assembly 24 drives the framework 31 to rotate, the framework 31 drives the rotating disc 18 to rotate, thereby driving the guide rod 21 to move.

[0045] With reference to Figure 4 And Figure 5 The handle 10 is hollow, the driving assembly 24 includes a driving ring 241 sliding on the inner wall of the handle 10 and an elastic member 242 provided on the outer cover 2, and the elastic member 242 is preferably a spring in the application, one end of the elastic member 242 is welded with the inner wall of the outer cover 2, the other end is welded with the side wall of the driving ring 241, the side wall of the driving ring 241 is welded with a driving pin 22, the shape of the driving pin 22 is non-circular in the application, the end of the filter core 3 and the rotating disc 18 are both provided with a sliding hole, the end of the driving pin 22 is slidingly connected in the sliding hole, and the driving ring 241 is rotated to drive the driving pin 22 to rotate, the driving pin 22 drives the rotating disc 18 and the framework 31 to rotate synchronously.

[0046] With reference to Figure 4 The end cover of the filter core 3 is welded with a positioning frame 25, the side wall of the positioning frame 25 is provided with a tension surface, the side wall of the positioning frame 25 abuts with the side wall of the filter paper 32, the driving pin 22 is driven to move by the rotating disc 18, the driving pin 22 drives the filter paper 32 to move, the radius of the filter paper 32 changes, the density of the creases of the filter paper 32 is adjusted, thereby the oil liquid of different concentrations and pressures is filtered.

[0047] With reference to Figure 4 The inner wall of the liquid outlet 5 is clamped with a filter screen 27, the oil liquid entering the filter is filtered by the filter paper 32, flows to the liquid outlet 5, and then flows out from the liquid outlet 5 after being filtered by the filter screen 27, the filter screen 27 is provided to filter the oil liquid in the filter twice, thereby the oil liquid is filtered more thoroughly.

[0048] In the second embodiment of the application, the implementation principle of the filter for the battery cooler of the new energy vehicle is that: the staff rotates the driving ring 241 according to the viscosity, the amount of impurities and the pressure of the cooling oil liquid in the battery cooler, the driving ring 241 drives the rotating disc 18 to rotate, the rotating disc 18 drives the driving pin 22 to move, the driving pin 22 drives the filter paper 32 to move, the angle between the filter screen creases changes, thereby the different oil liquids are filtered, the oil liquid filtration is facilitated, and the practicality of the filter is improved.

[0049] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A filter for a new energy automobile battery cooler, comprising a cavity seat (1), an outer cover (2) threadedly connected to the cavity seat (1), and a filter element (3) arranged in the cavity seat (1), a liquid inlet (4) and a liquid outlet (5) are formed in the side wall of the cavity seat (1), liquid entering the liquid inlet (4) flows out from the liquid outlet (5) through the filter element (3), characterized in that: The side wall of the end cover of the filter element (3) is fixed with a limiting ring (6), the side wall of the limiting ring (6) is fixed with a first limiting block (7), the inner wall of the outer cover (2) is fixed with a blocking ring (8), the side wall of the blocking ring (8) is fixed with a second limiting block (9), the side wall of the first limiting block (7) can abut against the second limiting block (9) towards one side of the bottom wall of the outer cover (2), and the outer wall of the outer cover (2) is fixed with a twisting handle (10). ​ The filter element (3) comprises a framework (31) and filter paper (32) sleeved on the outer wall of the framework (31), the end cover of the filter element (3) is arranged at the end of the framework (31), the end cover at both ends of the filter element (3) is rotationally connected with a rotating disc (18), a plurality of guide grooves (19) are arranged on the end cover of the filter element (3), a plurality of guide rods (21) are slidably connected to the side wall of the rotating disc (18), the outer wall of the rotating disc (18) is provided with a rebounding piece for enabling the end of the guide rod (21) to abut against the inner wall of the guide groove (19), the outer wall of the guide rod (21) is fixed with a guide pin (23), the guide pin (23) is fixedly connected with the filter paper (32), the framework (31) is fixedly connected with the rotating disc (18), and the outer cover (2) is provided with a driving assembly (24) for driving the framework (31) to rotate.

2. The filter for use in a new energy vehicle battery cooler according to claim 1, characterized in that: The outer wall of the filter element (3) is fixed with a positioning block (11), and the side wall of the blocking ring (8) is provided with a groove (20), the positioning block (11) is clamped and fixed in the groove (20).

3. The filter for use in a new energy vehicle battery cooler according to claim 1, characterized in that: The side wall of the end cover of the filter element (3) is detachably connected with a connecting frame (12), the connecting frame (12) is located at the position of the liquid outlet (5), the inner wall of the connecting frame (12) is clamped and fixed with a mounting frame (13), the inner wall of the mounting frame (13) is provided with a positioning groove (14), the inner wall of the positioning groove (14) is clamped and fixed with a sealing coil (15), and the sealing coil (15) abuts against the side wall of the cavity seat (1).

4. The filter for use in a new energy vehicle battery cooler according to claim 3, characterized in that: The outer wall of the outer cover (2) is provided with a plurality of clamping grooves (16), the inner wall of the clamping groove (16) is clamped and fixed with a sealing ring (17), and the outer wall of the sealing ring (17) abuts against the inner wall of the cavity seat (1).

5. The filter for use in a new energy vehicle battery cooler according to claim 1, characterized in that: The outer cover (2) is hollow, the driving assembly (24) comprises a driving ring (241) rotating on the inner wall of the outer cover (2) and an elastic piece (242) arranged on the outer cover (2) for limiting the rotation of the driving ring (241), and the end cover of the filter element (3) is fixedly connected with the driving ring (241) through the elastic piece (242).

6. The filter for use in a new energy vehicle battery cooler according to claim 5, characterized in that: The end cover of the filter element (3) is fixed with a positioning frame (25), the positioning frame (25) is connected with the inner wall of the filter paper (32), and the side wall of the positioning frame (25) is provided with a tensioning surface.

7. The filter for use in a new energy vehicle battery cooler according to claim 1, characterized in that: The end cover of the filter element (3) is provided with a filter screen (27), and the filter screen (27) is located at the position of the liquid outlet (5).

Images