Check valve mud blocking structure
By setting a mud-blocking structure at the inlet of the check valve, multi-stage filtration of the fluid is achieved, solving the problem of impurities entering the valve, protecting the internal components of the valve, preventing contamination and blockage, and ensuring normal operation.
Patent Information
- Application Number
- CN202520320407.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing check valves lack filtration and sludge-blocking functions, leading to a gradual increase of impurities such as sludge in the pipeline, which may damage internal components and cause problems such as shutdown and water pollution.
A mud-blocking structure is installed at the inlet end of the check valve, including a filter box and multi-stage filter elements. The fluid is filtered in multiple stages by inclined filter plates and filter screens, and impurities are collected in the storage chamber to prevent them from entering the valve.
It effectively reduces the damage of impurities to the internal components of the check valve, ensures normal operation, prevents water pollution and pipe blockage, and facilitates subsequent cleaning of impurities.
Smart Images
Figure CN223740101U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to check valve technical field especially relates to a check valve mud resistance structure. BACKGROUND
[0002] Check valve is a kind of automatic valve, main function is to block the backflow of medium, also called check valve, one-way valve or backflow valve, it relies on the flow force of medium itself to automatically open and close valve clack, usually used in pipeline system, to prevent medium backflow, pump and its driving motor reverse rotation, and the discharge of medium in container, the working principle of check valve is based on medium pressure and the self-weight of valve clack. When medium flows from the inlet end, if the inlet pressure is greater than the sum of the weight of valve clack and its flow resistance, the valve will open;Conversely, when medium tries to backflow, the valve will automatically close, thereby preventing medium backflow.
[0003] However, the existing check valve lacks filtering mud resistance function, and with the extension of service time, the silt and other impurities in the water in the pipeline will gradually increase, which not only may cause damage to the internal components of the check valve by silt and other impurities, resulting in shutdown and other conditions, but also may cause a series of problems such as water pollution and pipeline blockage, affecting its use. SUMMARY
[0004] In view of the above problem, the utility model provides a check valve mud resistance structure.
[0005] The utility model discloses a check valve blocks mud structure, including the valve body, the valve body front end is the entrance, the valve body rear end is the exit, the entrance of valve body front end is provided with the mud blocking structure, the mud blocking structure includes filter box, coarse filter core, middle filter core and fine filter core, the entrance of valve body front end is open with filter box, and the coarse filter core, middle filter core and fine filter core are set gradually according to the order of gradually approaching valve body in filter box inside, the coarse filter core, middle filter core and fine filter core all include filter frame, the filter frame top end corresponds filter frame and is set up with sliding slot, the filter frame can be inserted into filter box inside through sliding slot, the filter frame top end rear side is set up with the plug-in groove, the filter frame in the coarse filter core is provided with the coarse filter screen, and the coarse filter screen can be slidably removed in the filter frame through the plug-in groove, the filter frame in the middle filter core is provided with the middle filter screen, and the middle filter screen can be slidably removed in the filter frame through the plug-in groove, the filter frame in the fine filter core is provided with the fine filter screen, and the fine filter screen can be slidably removed in the filter frame through the plug-in groove, the filter hole size of coarse filter screen, middle filter screen and fine filter screen gradually reduces, and the top between plug-in groove of coarse filter screen, middle filter screen and fine filter screen is provided with the clamping mechanism, and the lower part between coarse filter screen front side and filter frame is provided with the inclined coarse filter board, and the bottom and both sides of inclined coarse filter board are fixedly connected with the bottom and both sides of filter frame, and the top of inclined coarse filter board is abutted with coarse filter screen front side, the lower part between middle filter screen front side and filter frame is provided with the inclined middle filter board, and the bottom and both sides of inclined middle filter board are fixedly connected with the bottom and both sides of filter frame, and the top of inclined middle filter board is abutted with middle filter screen front side, the lower part between fine filter screen front side and filter frame is provided with the inclined fine filter board, and the bottom and both sides of inclined fine filter board are fixedly connected with the bottom and both sides of filter frame, and the top of inclined fine filter board is abutted with fine filter screen front side.
[0006] Preferably, the inclined coarse filter board, the inclined middle filter board and the inclined fine filter board each include an inclined frame, and a plurality of horizontal rods and vertical rods fixed in the inclined frame, the horizontal rods and the vertical rods are fixedly connected perpendicularly to each other, a plurality of filter holes are formed between the horizontal rods and the vertical rods, and the filter hole sizes of the inclined coarse filter board, the inclined middle filter board and the inclined fine filter board gradually decrease.
[0007] Preferably, a protection ball is fixedly connected at the intersection of each of the horizontal rods and the vertical rods.
[0008] Preferably, the filter hole sizes of the inclined coarse filter board, the inclined middle filter board and the inclined fine filter board are each larger than the filter hole sizes of the coarse filter screen, the middle filter screen and the fine filter screen.
[0009] Preferably, the clamping mechanism comprises two inner grooves respectively formed on the two sides of the insertion groove; the two sides of the coarse filter screen, the medium filter screen and the fine filter screen are provided with clamping holes, the top surfaces of the coarse filter screen, the medium filter screen and the fine filter screen are provided with limiting holes in communication with the clamping holes, the limiting holes are sleeved with first springs, the two ends of the first springs are connected with clamping columns, the two ends of the clamping columns away from each other penetrate through the clamping holes and extend into the inner grooves, the outer circumferential surfaces of the clamping columns are fixedly provided with limiting columns, and one end of the limiting column extends to the outside through the limiting hole.
[0010] Preferably, the limiting mechanism is arranged between the top end of the filter frame and the filter box and is used for limiting the movement of the filter frame in the vertical direction.
[0011] Preferably, the limiting mechanism comprises a right-angle plate, a fixed rod, a limiting plate, a pressing spring and a clamping groove, the right-angle plate is arranged on the two sides of the filter box, the fixed rod is fixedly connected to the positions corresponding to the right-angle plate on the two side surfaces of the filter box, the fixed rod penetrates through the right-angle plate and is slidably connected with the right-angle plate, the limiting plate is arranged on the end of the fixed rod away from the filter box, the pressing spring is arranged between the limiting plate and the right-angle plate and on the surface of the fixed rod, the outer surface of the filter frame and the two sides of the filter box are provided with clamping grooves corresponding to the right-angle plate, and the right-angle plate can be clamped into the clamping groove.
[0012] Preferably, the filter frame and the box body are fixedly provided with a sealing gasket.
[0013] Preferably, the top end of the filter frame is fixedly provided with a handle.
[0014] Preferably, the filter box is provided with a water inlet pipe and a water outlet pipe at the front end and the rear end respectively, the end portions of the water inlet pipe and the water outlet pipe are fixedly connected with flanges, the inlet end of the front end of the valve body and the outlet end of the rear end are also fixedly connected with flanges, and the water outlet pipe of the filter box and the inlet end of the front end of the valve body are in communication through the flanges and bolts.
[0015] The utility model discloses beneficial effects are:
[0016] The mud blocking structure is installed in the pipeline upstream of the check valve, i.e. before the fluid enters the check valve, so that the fluid entering the check valve has been filtered by the mud blocking structure, the damage of impurities to the internal components of the check valve is reduced, the impurities in the medium are prevented from entering the check valve to a certain extent, so that the key components such as the valve disc and the valve seat are protected from damage, and the normal work of the check valve is ensured; the mud blocking structure comprises a filter box, a coarse filter core, a middle filter core and a fine filter core, the coarse filter core, the middle filter core and the fine filter core perform multi-stage filtration on the fluid, and are respectively provided with an inclined coarse filter plate, an inclined middle filter plate and an inclined fine filter plate, the inclined coarse filter plate, the inclined middle filter plate and the inclined fine filter plate form storage cavities containing impurities between the coarse filter screen, the middle filter screen and the fine filter screen and the filter frame, respectively, the blocked impurities are collected in the storage cavities through the inclined coarse filter plate, the inclined middle filter plate and the inclined fine filter plate, and are convenient for being removed from the mud blocking structure subsequently. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a structural schematic view of the check valve and the mud blocking structure of the utility model;
[0018] Figure 2 It is a structural schematic view of the mud blocking structure of the utility model;
[0019] Figure 3 It is a structural schematic view of the limiting mechanism of the utility model;
[0020] Figure 4 It is a structural schematic view of the coarse filter core of the utility model;
[0021] Figure 5 It is a structural schematic view of the inclined coarse filter plate of the utility model;
[0022] Figure 6 It is a rear view of the coarse filter core of the utility model;
[0023] Figure 7 It is a structural schematic view of the coarse filter screen of the utility model;
[0024] Figure 8 It is a structural schematic view of the filter frame of the utility model.
[0025] In the figure: 1, valve body; 11, inlet end; 12, outlet end; 2, mud blocking structure; 21, filter box; 211, sliding slot; 212, water inlet pipe; 213, water outlet pipe; 22, coarse filter core; 23, medium filter core; 24, fine filter core; 3, filter frame; 31, plug-in slot; 32, coarse filter screen; 33, inclined coarse filter plate; 331, inclined frame; 332, cross bar; 333, longitudinal bar; 334, filter hole; 335, protective ball; 4, clamping mechanism; 41, inner slot; 42, clamping hole; 43, limiting hole; 44, first spring; 45, clamping column; 46, limiting column; 5, limiting mechanism; 51, right-angle plate; 52, fixed rod; 53, limiting plate; 54, abutting spring; 55, clamping slot; 6, handle; 7, flange plate. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.
[0027] As Figures 1 to 8 shown in the figure, the utility model is a check valve mud blocking structure 2, including valve body 1, the front end of valve body 1 is inlet end 11, the rear end of valve body 1 is outlet end 12, the person skilled in the art is known, the existing check valve lacks the filter mud blocking function, the mud and other impurities in the water in the pipeline can gradually increase along with the extension of the use time of this check valve, not only can cause the damage of mud and other impurities to the internal components of check valve, causes the situation such as shutdown, also can bring a series of problems such as water pollution, pipeline blockage, influence its use.
[0028] In the embodiment, the inlet end 11 at the front end of the valve body 1 is provided with a mud blocking structure 2, the mud blocking structure 2 comprises a filter box 21, a coarse filter core 22, a middle filter core 23 and a fine filter core 24, the inlet end 11 at the front end of the valve body 1 is communicated with the filter box 21, the coarse filter core 22, the middle filter core 23 and the fine filter core 24 are sequentially arranged in the filter box 21 in the order of gradually approaching the valve body 1, the coarse filter core 22, the middle filter core 23 and the fine filter core 24 all comprise a filter frame 3, the filter box 21 is provided with a sliding insertion slot 211 at the top end corresponding to the filter frame 3, the filter frame 3 can be inserted into the filter box 21 through the sliding insertion slot 211, the filter frame 3 is provided with an insertion slot 31 at the top end rear side, the filter frame 3 of the coarse filter core 22 is provided with a coarse filter screen 32, and the coarse filter screen 32 can be slidably removed from the filter frame 3 through the insertion slot 31, the filter frame 3 of the middle filter core 23 is provided with a middle filter screen, and the middle filter screen can be slidably removed from the filter frame 3 through the insertion slot 31, the filter frame 3 of the fine filter core 24 is provided with a fine filter screen, and the fine filter screen can be slidably removed from the filter frame 3 through the insertion slot 31, the filter holes 334 of the coarse filter screen 32, the middle filter screen and the fine filter screen gradually decrease in size, the top end of the coarse filter screen 32 and the insertion slot 31 are provided with a clamping mechanism 4, the lower part of the front side of the coarse filter screen 32 and the filter frame 3 are provided with an inclined coarse filter plate 33, the bottom end and the two side faces of the inclined coarse filter plate 33 are fixedly connected with the bottom end and the two side faces of the filter frame 3, the top end of the inclined coarse filter plate 33 abuts against the front side of the coarse filter screen 32, the lower part of the front side of the middle filter screen and the filter frame 3 are provided with an inclined middle filter plate, the bottom end and the two side faces of the inclined middle filter plate are fixedly connected with the bottom end and the two side faces of the filter frame 3, the top end of the inclined middle filter plate abuts against the front side of the middle filter screen, the lower part of the front side of the fine filter screen and the filter frame 3 are provided with an inclined fine filter plate, the bottom end and the two side faces of the inclined fine filter plate are fixedly connected with the bottom end and the two side faces of the filter frame 3, and the top end of the inclined fine filter plate abuts against the front side of the fine filter screen.
[0029] The silt blocking structure 2 is installed in the pipeline upstream of the check valve, i.e. before the fluid enters the check valve, so that the fluid entering the check valve has been filtered by the silt blocking structure 2, reducing the damage of impurities to the internal components of the check valve, preventing impurities in the medium from entering the check valve to a certain extent, thereby protecting the key components such as the valve disc and the valve seat, and ensuring the normal operation of the check valve; the silt blocking structure 2 includes a filter box 21, a coarse filter core 22, a medium filter core 23 and a fine filter core 24, the coarse filter core 22, the medium filter core 23 and the fine filter core 24 perform multi-stage filtration on the fluid, which can also avoid the problem of clogging and accumulation of impurities in the filter screen to a certain extent, and are respectively provided with an inclined coarse filter plate 33, an inclined medium filter plate and an inclined fine filter plate, the inclined coarse filter plate 33, the inclined medium filter plate and the inclined fine filter plate form a storage cavity containing impurities between the coarse filter screen 32, the medium filter screen and the fine filter screen and the filter frame 3, the blocked impurities enter the storage cavity through the inclined coarse filter plate 33, the inclined medium filter plate and the inclined fine filter plate and are collected, which is convenient for subsequent removal of the silt blocking structure 2.
[0030] Moreover, in the embodiment, the inclined coarse filter plate 33, the inclined medium filter plate and the inclined fine filter plate each include an inclined frame 331 and a plurality of horizontal rods 332 and vertical rods 333 fixed in the inclined frame 331, the horizontal rods 332 and the vertical rods 333 are fixedly connected perpendicularly to each other, a plurality of filter holes 334 are formed between the horizontal rods 332 and the vertical rods 333, the sizes of the filter holes 334 of the inclined coarse filter plate 33, the inclined medium filter plate and the inclined fine filter plate decrease in turn, and a protection ball 335 is fixedly connected at the intersection of the horizontal rods 332 and the vertical rods 333, the sizes of the filter holes 334 of the inclined coarse filter plate 33, the inclined medium filter plate and the inclined fine filter plate are each greater than the filter holes 334 of the coarse filter screen 32, the medium filter screen and the fine filter screen.
[0031] The inclined frame 331 and the plurality of horizontal rods 332 and vertical rods 333 fixed in the inclined frame 331 form a plurality of filter holes 334 between the horizontal rods 332 and the vertical rods 333, the impurities can enter the storage cavity and be collected through the filter holes 334 of different sizes, and the protection ball 335 can increase the stability of the connection between the horizontal rods 332 and the vertical rods 333 and also avoid damage to the connection to a certain extent.
[0032] Further, in the embodiment, the clamping mechanism 4 includes two inner grooves 41 respectively formed on the two sides of the inner part of the insertion groove 31; the two sides of the coarse filter screen 32, the middle filter screen and the fine filter screen are provided with clamping holes 42, the top surfaces of the coarse filter screen 32, the middle filter screen and the fine filter screen are provided with limiting holes 43, the limiting holes 43 are communicated with the clamping holes 42, the first spring 44 is sleeved in the limiting hole 43, the two ends of the first spring 44 are connected with the clamping columns 45, the two ends of the two clamping columns 45 away from each other penetrate through the clamping holes 42 and extend into the inner part of the inner groove 41, the outer circumferential surfaces of the two clamping columns 45 are fixedly installed with the limiting columns 46, one end of the limiting column 46 penetrates through the limiting hole 43 and extends to the outside.
[0033] Through the clamping mechanism 4, the coarse filter screen 32, the middle filter screen and the fine filter screen can be stably fixed in the filter frame 3, which can prevent them from shaking or moving up and down and left and right to a certain extent, and improve the filtering effect. When the two limiting columns 46 are moved to the two sides close to each other, the clamping column 45 is moved out of the inner part of the inner groove 41, at this time, the first spring 44 is in a stressed state, at this time, the coarse filter screen 32, the middle filter screen and the fine filter screen can be taken out from the inner part of the insertion groove 31 by pulling the limiting column 46, which is convenient for replacing the filter screen and cleaning the impurities collected in the storage cavity. When installation is needed, the coarse filter screen 32, the middle filter screen and the fine filter screen are inserted into the filter frame 3 from the insertion groove 31, the limiting column 46 is loosened, the clamping column 45 is clamped in the inner part of the inner groove 41 by the action force of the first spring 44, and the installation is completed.
[0034] Further, in the embodiment, the filter frame 3 and the filter box 21 are provided with the limiting mechanism 5, and the limiting mechanism 5 is used for limiting and fixing the movement of the filter frame 3 in the vertical direction.
[0035] The limiting mechanism 5 is used for fixing and limiting the movement of the filter frame 3, and prevents the filter frame 3 from moving in the filter box 21.
[0036] Further, in the embodiment, the limiting mechanism 5 includes the right-angle plate 51, the fixed rod 52, the limiting plate 53, the abutting spring 54 and the clamping groove 55, the right-angle plate 51 is arranged on the two sides of the filter box 21, the fixed rod 52 is fixedly connected with the filter box 21 at the positions corresponding to the right-angle plate 51 on the two side surfaces of the filter box 21, the fixed rod 52 penetrates through the right-angle plate 51 and is slidably connected with the right-angle plate 51, the limiting plate 53 is arranged on the end of the fixed rod 52 away from the filter box 21, the abutting spring 54 is arranged between the limiting plate 53 and the right-angle plate 51 on the surface of the fixed rod 52, the filter frame 3 and the filter box 21 are provided with the clamping groove 55 corresponding to the right-angle plate 51 on the two sides, and the right-angle plate 51 can be clamped into the clamping groove 55.
[0037] Through the limiting mechanism 5, when the filter frame 3 is inserted into the filter box 21, pull the right angle plate 51 on the fixed rod 52, and the compression spring 54 is compressed, then insert the filter frame 3 into the filter box 21, release the right angle plate 51, the compression spring 54 is stretched to drive the right angle plate 51 to reset, and the right angle plate 51 enters the clamping groove 55 on the upper end of the filter frame 3, limiting and fixing the filter frame 3, avoiding the shaking of the filter frame 3.
[0038] In addition, the filter frame 3 and the box body are fixedly installed with a sealing gasket.
[0039] Through the sliding slot 211, the filter frame 3 is moved into or out of the filter box 21, and the sealing gasket ensures that the filter box 21 does not leak water to a certain extent.
[0040] In addition, the top front side of the filter frame 3 is fixedly provided with a handle 6.
[0041] Through the handle 6, the operator can hold the handle 6 to move the filter frame 3.
[0042] In addition, the filter box 21 is provided with a water inlet pipe 212 and a water outlet pipe 213 at the front and rear ends, respectively, and the end portions of the water inlet pipe 212 and the water outlet pipe 213 are fixedly connected with flanges 7, and the inlet end 11 at the front end and the outlet end 12 at the rear end of the valve body 1 are also fixedly connected with flanges 7, and the water outlet pipe 213 of the filter box 21 and the inlet end 11 at the front end of the valve body 1 are communicated through the flanges 7 and bolts.
[0043] Through such a setting, the filter box 21 and the check valve are communicated.
[0044] In use, the right angle plate 51 is pulled to slide on the fixed rod 52, and the compression spring 54 is compressed, then the filter frame 3 is inserted into the filter box 21, the right angle plate 51 is released, the compression spring 54 is stretched to drive the right angle plate 51 to reset, and the right angle plate 51 enters the clamping groove 55 on the upper end of the filter frame 3 to limit and fix the filter frame 3, the fluid is filtered by the multi-stage filter, the inclined coarse filter plate 33, the inclined middle filter plate and the inclined fine filter plate form the storage cavity containing impurities between the coarse filter screen 32, the middle filter screen and the fine filter screen and the filter frame 3, the blocked impurities enter the storage cavity through the inclined coarse filter plate 33, the inclined middle filter plate and the inclined fine filter plate and are collected, when the filtering is completed, the right angle plate 51 is pulled to slide on the fixed rod 52, the filter frame 3 is taken out, the two limiting columns 46 are moved to the two sides close to each other, the clamping column 45 is moved out from the inside of the inner groove 41, at this time, the first spring 44 is in the stressed state, at this time, the coarse filter screen 32, the middle filter screen and the fine filter screen can be taken out from the inside of the insertion slot 31 by pulling the limiting column 46, which is convenient for replacing the filter screen and cleaning the impurities collected in the storage cavity.
[0045] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A check valve anti-mud structure, comprising a valve body (1), the front end of the valve body (1) is an inlet end (11), the rear end of the valve body (1) is an outlet end (12), characterized in that: The inlet end (11) of the front end of the valve body (1) is provided with a mud blocking structure (2), the mud blocking structure (2) comprises a filter box (21), a coarse filter core (22), a medium filter core (23) and a fine filter core (24), the inlet end (11) of the front end of the valve body (1) is communicated with the filter box (21), the coarse filter core (22), the medium filter core (23) and the fine filter core (24) are sequentially arranged in the filter box (21) in the order of gradually approaching the valve body (1), the coarse filter core (22), the medium filter core (23) and the fine filter core (24) all comprise a filter frame (3), a sliding insertion slot (211) is formed in the top end of the filter box (21) corresponding to the filter frame (3), the filter frame (3) can be inserted into the filter box (21) through the sliding insertion slot (211), an insertion slot (31) is formed in the top end of the filter frame (3), a coarse filter screen (32) is arranged in the filter frame (3) of the coarse filter core (22), and the coarse filter screen (32) can be slidably moved out of the filter frame (3) through the insertion slot (31), a medium filter screen is arranged in the filter frame (3) of the medium filter core (23), and the medium filter screen can be slidably moved out of the filter frame (3) through the insertion slot (31), a fine filter screen is arranged in the filter frame (3) of the fine filter core (24), and the fine filter screen can be slidably moved out of the filter frame (3) through the insertion slot (31), the filter holes (334) of the coarse filter screen (32), the medium filter screen and the fine filter screen gradually decrease in size, a clamping mechanism (4) is arranged between the top end of the coarse filter screen (32), the medium filter screen and the fine filter screen and the insertion slot (31), an inclined coarse filter plate (33) is arranged between the lower part of the front side of the coarse filter screen (32) and the filter frame (3), the bottom end and the two side faces of the inclined coarse filter plate (33) are fixedly connected with the bottom end and the two side faces of the filter frame (3) respectively, the top end of the inclined coarse filter plate (33) abuts against the front side of the coarse filter screen (32), an inclined medium filter plate is arranged between the lower part of the front side of the medium filter screen and the filter frame (3), the bottom end and the two side faces of the inclined medium filter plate are fixedly connected with the bottom end and the two side faces of the filter frame (3) respectively, the top end of the inclined medium filter plate abuts against the front side of the medium filter screen, an inclined fine filter plate is arranged between the lower part of the front side of the fine filter screen and the filter frame (3), the bottom end and the two side faces of the inclined fine filter plate are fixedly connected with the bottom end and the two side faces of the filter frame (3) respectively, and the top end of the inclined fine filter plate abuts against the front side of the fine filter screen.
2. A check valve mud exclusion structure according to claim 1, wherein: The inclined coarse filter plate (33), the inclined medium filter plate and the inclined fine filter plate all comprise an inclined frame (331), a plurality of horizontal rods (332) and vertical rods (333) fixed in the inclined frame (331), the horizontal rods (332) and the vertical rods (333) are fixedly connected with each other perpendicularly, a plurality of filter holes (334) are formed between the horizontal rods (332) and the vertical rods (333), and the filter holes (334) of the inclined coarse filter plate (33), the inclined medium filter plate and the inclined fine filter plate gradually decrease in size.
3. A check valve mud exclusion structure according to claim 2, wherein: The intersection of the cross bar (332) and the vertical bar (333) is fixedly connected with a protective ball (335).
4. A check valve mud exclusion structure according to claim 3, wherein: The filter holes (334) of the inclined coarse filter plate (33), the inclined medium filter plate and the inclined fine filter plate are all larger than the filter holes (334) of the coarse filter screen (32), the medium filter screen and the fine filter screen.
5. The check valve mud exclusion structure of claim 1, wherein: The clamping mechanism (4) comprises two inner grooves (41) respectively arranged on the two sides of the insertion groove (31); the two side surfaces of the coarse filter screen (32), the medium filter screen and the fine filter screen are provided with clamping holes (42); the top surfaces of the coarse filter screen (32), the medium filter screen and the fine filter screen are provided with limiting holes (43) in communication with the clamping holes (42); the limiting holes (43) are provided with first springs (44); the two ends of the first springs (44) are connected with clamping columns (45); the two ends of the clamping columns (45) are arranged in the inner grooves (41) through the clamping holes (42); the outer circumferential surfaces of the clamping columns (45) are fixedly provided with limiting columns (46) extending out of the limiting holes (43).
6. A check valve mud exclusion structure according to claim 1, wherein: The limiting mechanism (5) is arranged between the top end of the filter frame (3) and the filter box (21) and is used for limiting the movement of the filter frame (3) in the vertical direction.
7. A check valve mud exclusion structure according to claim 6, wherein: The limiting mechanism (5) comprises a right-angle plate (51), a fixed rod (52), a limiting plate (53), a pressing spring (54) and a clamping groove (55); the right-angle plate (51) is arranged on the two sides of the filter box (21); the fixed rod (52) is fixedly connected to the filter box (21) at the positions corresponding to the right-angle plate (51); the fixed rod (52) penetrates through the right-angle plate (51) and is in sliding connection with the right-angle plate (51); the limiting plate (53) is arranged at the end of the fixed rod (52) away from the filter box (21); the pressing spring (54) is arranged between the limiting plate (53) and the right-angle plate (51) and on the surface of the fixed rod (52); the filter frame (3) and the filter box (21) are provided with the clamping grooves (55) corresponding to the right-angle plate (51) on the outer surfaces thereof; and the right-angle plate (51) can be clamped into the clamping grooves (55).
8. The check valve mud exclusion structure of claim 1, wherein: The filter frame (3) and the box body are fixedly provided with a sealing gasket.
9. The check valve mud exclusion structure of claim 1, wherein: A handle (6) is fixedly arranged on the top front side of the filter frame (3).
10. The check valve mud exclusion structure of claim 1, wherein: The filter box (21) is provided with a water inlet pipe (212) and a water outlet pipe (213) at the front end and the rear end thereof respectively; the water inlet pipe (212) and the water outlet pipe (213) are fixedly provided with flanges (7) at the end portions thereof; the inlet end (11) of the valve body (1) and the outlet end (12) thereof are also fixedly provided with flanges (7); and the water outlet pipe (213) of the filter box (21) and the inlet end (11) of the valve body (1) are in communication through the flanges (7) and bolts.