Breather valve device for filter

Abstract

The utility model belongs to the technical field of breather valve devices, and particularly relates to a breather valve device for a filter, which comprises a breather valve body and a filter body, the filter body is positioned at the bottom of the breather valve body, and the breather valve body and the filter body are fixedly connected through a plurality of fixing bolts. The filter screen is arranged at the bottom of an air inlet of the breather valve body, fixing columns are fixedly installed on the breather valve body and located on one sides of the multiple fixing bolts, second sliding grooves are formed in the fixing columns, sliding columns are movably installed in the second sliding grooves, and tension springs fixed to the inner walls of the second sliding grooves are fixedly installed at the bottoms of the sliding columns. When the whole device is used, the filter screen is convenient to replace, tools are not needed, meanwhile, the fixing bolts cannot rotate reversely, the situation that the fixing bolts are loosened due to reverse rotation caused by vibration is avoided, and the stability of the whole device during operation is further ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of breathing valve devices, and in particular relates to a breathing valve device for a filter. Background Art

[0002] The filter is usually equipped with a breathing valve, which can automatically adjust the gas inlet and outlet when the pressure inside and outside the filter changes, ensuring the normal operation of the filter while preventing external pollutants from entering the filter.

[0003] For example, a Chinese patent with publication number CN215568340U discloses a breathing valve device for a filter, including a cup cover, a breathing valve is arranged on the top end face inside the cup cover, the breathing valve includes an air outlet channel extending from the top of the cup cover, and is characterized in that the breathing valve also includes a breathing valve body connected to the bottom of the air outlet channel, a accommodating chamber is arranged inside the breathing valve body, a plastic float is arranged inside the accommodating chamber, a step is arranged at the connection between the inside of the breathing valve body and the air outlet channel, an O-ring is arranged on the step, the diameter of the O-ring is smaller than the diameter of the plastic float, a plurality of water inlet holes are arranged at the same horizontal position on both sides of the breathing valve body, and a water outlet hole is arranged at the bottom of the breathing valve body. The structure is simple, and the automatic pressure relief and sealing functions of the breathing valve of the filter are completed by the principle that water enters the accommodating chamber, the plastic float floats, the accommodating chamber is drained, and the plastic float falls.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when used, such as: the above device needs to filter when taking in air, the filter screen may be damaged after long-term use and needs to be replaced, and the bolts may rust and strip after long-term use and cannot be disassembled. At the same time, the filter will vibrate when in use, and long-term vibration may cause the valve disc, guide rod, spring and other parts to loosen or shift, thereby affecting the normal operation of the breathing valve. In view of this, we propose a breathing valve device for a filter. Utility Model Content

[0006] The purpose of the utility model is to provide a breathing valve device for a filter to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a breathing valve device for a filter, comprising: a breathing valve body and a filter body, wherein the filter body is located at the bottom of the breathing valve body, and the breathing valve body and the filter body are fixedly connected by a plurality of fixing bolts, and further comprising:

[0008] A filter screen, the filter screen is arranged at the bottom of the air inlet of the breathing valve body, a fixing column is fixedly installed on the breathing valve body and located on one side of the plurality of fixing bolts, a sliding groove 2 is opened in the fixing column, a sliding column is movably installed in the sliding groove 2, a tension spring fixed to the inner wall of the sliding groove 2 is fixedly installed at the bottom of the sliding column, and the upper end of the sliding column passes through the fixing column and extends to the outside;

[0009] A fixing component, which is located on the filter screen and is used to fix the position of the filter screen;

[0010] A power chamber, wherein the power chamber is provided in the sliding column, a ratchet is rotatably mounted in the power chamber, a sleeve is fixedly mounted at the lower end of the ratchet, the sleeve is rotatably connected to the power chamber, and the lower end of the sleeve passes through the power chamber and extends to a corresponding fixing bolt, and the sleeve is sleeve-fitted with the fixing bolt;

[0011] A plurality of limit assemblies are respectively located on a plurality of sliding posts and are respectively used to limit the rotation directions of a plurality of ratchets.

[0012] In the technical solution, when the filter needs to be replaced, the filter can be removed by the fixed assembly. When a new filter needs to be installed, the filter is first placed at the bottom of the air inlet of the breathing valve body. The filter can be fixed to the bottom of the air inlet of the breathing valve body by the fixed assembly, which is convenient for replacing the filter without the use of tools.

[0013] When the breathing valve body and the filter body are fixed by several fixing bolts, the personnel first pulls the several sliding columns to slide upwards, and at the same time, the several tension springs are pulled and stretched, and then the several sliding columns are rotated. When the several sliding columns are rotated to the appropriate positions, the several sleeves are respectively located directly above the several fixing bolts. At this time, the sleeve is rotated, and the sleeve drives the ratchet to rotate. When the sleeve is rotated to the appropriate position, the personnel loosens the sliding column. Under the action of the tension of the tension spring, the sliding column slides downward, and the sliding column drives the sleeve to be sleeved on the fixing bolt. Through the set limit assembly, the sleeve can only rotate forward and cannot rotate reversely, and further prevents the fixing bolt from rotating reversely, and the fixing bolt will not be loosened due to vibration, further ensuring the stability of the overall device during operation.

[0014] In the above technical solution, further, the fixing assembly includes:

[0015] Two rotating grooves, both of which are arranged on the breathing valve body and located on the top of the filter screen, and a limit block fixed to the top of the filter screen is movably installed in the rotating groove;

[0016] Two sliding grooves 1, both of which are opened in the filter net, a limiting column is slidably installed in the sliding groove 1, and a spring fixed to the inner wall of the sliding groove 1 is fixedly installed at the bottom of the limiting column, the upper end of the limiting column passes through the sliding groove 1 and extends into the breathing valve body, the limiting column is plugged into the breathing valve body, and one side of the limiting column passes through the sliding groove and extends to the outside.

[0017] In the technical solution, when the filter needs to be replaced, first pull the two limit posts downward, and the two springs are squeezed and contracted. When the two limit posts are separated from the breathing valve body, rotate the filter, and the filter drives the two limit blocks to rotate in the two rotating grooves respectively. When the two limit blocks rotate to the appropriate position, pull the filter downward, and the filter drives the two limit blocks to separate from the two rotating grooves respectively, so that the filter can be removed;

[0018] When a new filter needs to be installed, first place the filter at the bottom of the air inlet of the breathing valve body, then the two limit blocks will enter the two rotating grooves respectively, and then rotate the filter, the filter drives the two limit blocks to rotate in the two rotating grooves, when the limit blocks rotate to the appropriate position, the filter can only rotate but not move up and down, loosen the two limit columns, and under the action of the rebound force of the two springs, the two springs drive the two limit columns to slide upward and insert into the breathing valve body, so that the filter cannot rotate, finally achieving the effect of fixing the filter to the bottom of the air inlet of the breathing valve body, which is convenient for replacing the filter without the use of tools.

[0019] In the above technical solution, further, the limit assembly includes:

[0020] The pawl is rotatably mounted in the power chamber, and one end of the pawl extends between two adjacent teeth of the ratchet wheel.

[0021] In the present technical solution, when a new filter needs to be installed, the filter is first placed at the bottom of the air inlet of the breathing valve body, and then the two limit blocks will enter the two rotating grooves respectively. Then the filter is rotated, and the filter drives the two limit blocks to rotate in the two rotating grooves. When the limit blocks are rotated to the appropriate position, the filter can only rotate and cannot move up and down. Loosen the two limit columns, and under the action of the rebound force of the two springs, the two springs drive the two limit columns to slide upward and insert into the breathing valve body, so that the filter cannot rotate. Finally, the filter is fixed to the bottom of the air inlet of the breathing valve body, which is convenient for replacing the filter without the use of tools.

[0022] In the above technical solution, further, a sealing rubber pad is fixedly installed on the top of the filter screen.

[0023] In this technical solution, the sealing performance of the connection between the filter screen and the breathing valve body is ensured.

[0024] In the above technical solution, further, the cross-section of the limit block is a "7" shape.

[0025] In this technical solution, when the limit block is rotated to a suitable position, the filter screen can only rotate but cannot move up and down.

[0026] In the above technical solution, further, the inner cavity size of the sleeve is the same as the size of the fixing bolt.

[0027] In this technical solution, it is ensured that the fixing bolt will not shake in the corresponding sleeve.

[0028] The beneficial effects of the utility model are:

[0029] 1. The breathing valve device for the filter can remove the filter by using the provided fixing assembly when the filter needs to be replaced. When a new filter needs to be installed, the filter is first placed at the bottom of the air inlet of the breathing valve body. The filter can be fixed to the bottom of the air inlet of the breathing valve body by using the provided fixing assembly, which facilitates the replacement of the filter without the use of tools.

[0030] 2. For the breathing valve device for the filter, the personnel first pulls the sliding columns to slide upwards, and at the same time, the tension springs are pulled and stretched, and then the sliding columns are rotated. When the sliding columns are rotated to the appropriate positions, the sleeves are respectively located directly above the fixing bolts. At this time, the sleeves are rotated, and the sleeves drive the ratchet to rotate. When the sleeves are rotated to the appropriate position, the personnel loosen the sliding columns, and under the action of the tension of the tension springs, the sliding columns slide downward, and the sliding columns drive the sleeves to be sleeved on the fixing bolts. Through the setting of the limit assembly, the sleeves can only rotate forward and cannot rotate reversely, and further the fixing bolts cannot rotate reversely, and the fixing bolts will not be loosened due to vibration, thereby further ensuring the stability of the overall device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is one of the overall structural schematic diagrams of the utility model;

[0032] Figure 2 This is the second schematic diagram of the overall structure of the utility model;

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the filter screen of the utility model;

[0034] Figure 4 The utility model Figure 3 The enlarged structural diagram at A in the middle;

[0035] Figure 5 It is a schematic diagram of the limit block area structure of the utility model;

[0036] Figure 6 It is a schematic diagram of the filter area structure of the utility model;

[0037] Figure 7 It is a schematic diagram of the partial explosion structure of the utility model;

[0038] Figure 8 It is a schematic diagram of the cross-sectional structure of the sliding column of the utility model;

[0039] Fig. 9 It is a schematic diagram of the structure of the pawl area of ​​the utility model.

[0040] The symbols in the figure are:

[0041] 1. Breathing valve body; 2. Filter screen; 3. Sliding groove 1; 4. Limiting column; 5. Spring; 6. Rotating groove; 7. Limiting block; 8. Filter body; 9. Fixed column; 10. Sliding column; 11. Power chamber; 12. Ratchet; 13. Sleeve; 14. Ratchet; 15. Fixing bolt; 16. Tension spring; 17. Sliding groove 2. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0043] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0045] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0046] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0047] Embodiment 1:

[0048] See also Figure 1 - Fig. 9 As shown, this embodiment provides a breathing valve device for a filter, including: a breathing valve body 1 and a filter body 8, the filter body 8 is located at the bottom of the breathing valve body 1, and the breathing valve body 1 and the filter body 8 are fixedly connected by a plurality of fixing bolts 15, and also includes:

[0049] The filter screen 2 is arranged at the bottom of the air inlet of the breathing valve body 1. A fixing column 9 is fixedly installed on the breathing valve body 1 and located on one side of the plurality of fixing bolts 15. A sliding groove 2 17 is provided in the fixing column 9. A sliding column 10 is movably installed in the sliding groove 17. A tension spring 16 fixed to the inner wall of the sliding groove 2 17 is fixedly installed at the bottom of the sliding column 10. The upper end of the sliding column 10 passes through the fixing column 9 and extends to the outside.

[0050] A fixing component, which is located on the filter screen 2 and is used to fix the position of the filter screen 2;

[0051] A power chamber 11 is provided in the sliding column 10. A ratchet 12 is rotatably mounted in the power chamber 11. A sleeve 13 is fixedly mounted at the lower end of the ratchet 12. The sleeve 13 is rotatably connected to the power chamber 11. The lower end of the sleeve 13 passes through the power chamber 11 and extends to a corresponding fixing bolt 15. The sleeve 13 is sleeved and matched with the fixing bolt 15.

[0052] A plurality of limit assemblies are respectively located on the plurality of sliding posts 10 and are respectively used to limit the rotation direction of the plurality of ratchets 12 .

[0053] When the filter 2 needs to be replaced, the filter 2 can be removed by the fixed assembly. When a new filter 2 needs to be installed, the filter 2 is first placed at the bottom of the air inlet of the breathing valve body 1. The filter 2 can be fixed to the bottom of the air inlet of the breathing valve body 1 by the fixed assembly, which is convenient for replacing the filter 2 without the use of tools.

[0054] When the breathing valve body 1 and the filter body 8 are fixed by a plurality of fixing bolts 15, the personnel first pulls the plurality of sliding columns 10 to slide upwards, and at the same time, the plurality of tension springs 16 are pulled and stretched, and then the plurality of sliding columns 10 are rotated. When the plurality of sliding columns 10 are rotated to the appropriate positions, the plurality of sleeves 13 are respectively located directly above the plurality of fixing bolts 15. At this time, the sleeve 13 is rotated, and the sleeve 13 drives the ratchet 12 to rotate. When the sleeve 13 is rotated to the appropriate position, the personnel loosens the sliding column 10. Under the action of the tension of the tension spring 16, the sliding column 10 slides downward, and the sliding column 10 drives the sleeve 13 to be sleeved on the fixing bolt 15. Through the setting of the limit assembly, the sleeve 13 can only rotate forward and cannot rotate reversely, and further the fixing bolt 15 cannot rotate reversely, and the fixing bolt 15 will not be loosened due to vibration reverse rotation, thereby further ensuring the stability of the overall device during operation.

[0055] In this embodiment, the fixing component includes:

[0056] Two rotating grooves 6, both of which are provided on the breathing valve body 1 and located on the top of the filter screen 2, and a limit block 7 fixed to the top of the filter screen 2 is movably installed in the rotating groove 6;

[0057] Two sliding grooves 3, both sliding grooves 3 are arranged in the filter 2, a limit column 4 is slidably installed in the sliding groove 3, a spring 5 fixed to the inner wall of the sliding groove 3 is fixedly installed at the bottom of the limit column 4, the upper end of the limit column 4 passes through the sliding groove 3 and extends into the breathing valve body 1, the limit column 4 is plugged and matched with the breathing valve body 1, and one side of the limit column 4 passes through the sliding groove 3 and extends to the outside;

[0058] When the filter 2 needs to be replaced, first pull the two limit posts 4 downward, and at the same time, the two springs 5 ​​are squeezed and contracted. When the two limit posts 4 are separated from the breathing valve body 1, rotate the filter 2, and the filter 2 drives the two limit blocks 7 to rotate in the two rotating grooves 6 respectively. When the two limit blocks 7 rotate to a suitable position, pull the filter 2 downward, and the filter 2 drives the two limit blocks 7 to separate from the two rotating grooves 6 respectively, so that the filter 2 can be removed;

[0059] When a new filter 2 needs to be installed, first place the filter 2 at the bottom of the air inlet of the breathing valve body 1, then the two limit blocks 7 will enter the two rotating grooves 6 respectively, and then rotate the filter 2, the filter 2 drives the two limit blocks 7 to rotate in the two rotating grooves 6, when the limit blocks 7 rotate to the appropriate position, the filter 2 can only rotate but cannot move up and down, loosen the two limit columns 4, under the action of the rebound force of the two springs 5, the two springs 5 ​​respectively drive the two limit columns 4 to slide upward and insert into the breathing valve body 1, so that the filter 2 cannot rotate, finally achieving the effect of fixing the filter 2 to the bottom of the air inlet of the breathing valve body 1, which is convenient for replacing the filter 2 without the use of tools.

[0060] In this embodiment, the limit assembly includes:

[0061] A pawl 14 is rotatably mounted in the power chamber 11, and one end of the pawl 14 extends between two adjacent teeth of the ratchet wheel 12;

[0062] Among them, when it is necessary to install a new filter 2, first place the filter 2 at the bottom of the air inlet of the breathing valve body 1, then the two limit blocks 7 will enter the two rotating grooves 6 respectively, and then rotate the filter 2, the filter 2 drives the two limit blocks 7 to rotate in the two rotating grooves 6, when the limit blocks 7 rotate to the appropriate position, the filter 2 can only rotate but cannot move up and down, loosen the two limit columns 4, and under the action of the rebound force of the two springs 5, the two springs 5 ​​respectively drive the two limit columns 4 to slide upward and insert into the breathing valve body 1, so that the filter 2 cannot rotate, finally achieving the effect of fixing the filter 2 to the bottom of the air inlet of the breathing valve body 1, which is convenient for replacing the filter 2 without the use of tools.

[0063] Embodiment 2:

[0064] This embodiment provides a breathing valve device for a filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] In this embodiment, a sealing rubber pad is fixedly installed on the top of the filter screen 2.

[0066] The sealing performance of the connection between the filter screen 2 and the breathing valve body 1 is ensured.

[0067] Embodiment 3:

[0068] This embodiment provides a breathing valve device for a filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0069] In this embodiment, the cross section of the limiting block 7 is in the shape of "7".

[0070] When the limit block 7 is rotated to a suitable position, the filter screen 2 can only rotate but cannot move up and down.

[0071] Embodiment 4:

[0072] This embodiment provides a breathing valve device for a filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0073] In this embodiment, the inner cavity size of the sleeve 13 is the same as the size of the fixing bolt 15 .

[0074] Here, it is ensured that the fixing bolt 15 does not shake in the corresponding sleeve 13 .

[0075] Working principle: When the filter 2 needs to be replaced, first pull the two limit posts 4 downward, and at the same time, the two springs 5 ​​are squeezed and contracted. When the two limit posts 4 are separated from the breathing valve body 1, rotate the filter 2, and the filter 2 drives the two limit blocks 7 to rotate in the two rotating grooves 6 respectively. When the two limit blocks 7 rotate to the appropriate position, pull the filter 2 downward, and the filter 2 drives the two limit blocks 7 to separate from the two rotating grooves 6 respectively, so that the filter 2 can be removed;

[0076] When a new filter 2 needs to be installed, first place the filter 2 at the bottom of the air inlet of the breathing valve body 1, then the two limit blocks 7 will enter the two rotating grooves 6 respectively, and then rotate the filter 2, the filter 2 drives the two limit blocks 7 to rotate in the two rotating grooves 6, when the limit blocks 7 rotate to a suitable position, the filter 2 can only rotate but cannot move up and down, loosen the two limit posts 4, under the action of the rebound force of the two springs 5, the two springs 5 ​​respectively drive the two limit posts 4 to slide upward and insert into the breathing valve body 1, so that the filter 2 cannot rotate, and finally achieves the effect of fixing the filter 2 to the bottom of the air inlet of the breathing valve body 1, which is convenient for replacing the filter 2 without the use of tools;

[0077] When the breathing valve body 1 and the filter body 8 are fixed by a plurality of fixing bolts 15, the personnel first pulls the plurality of sliding columns 10 to slide upwards, and at the same time, the plurality of tension springs 16 are pulled and stretched, and then the plurality of sliding columns 10 are rotated. When the plurality of sliding columns 10 are rotated to a suitable position, the plurality of sleeves 13 are respectively located directly above the plurality of fixing bolts 15. At this time, the sleeve 13 is rotated, and the sleeve 13 drives the ratchet 12 to rotate. When the sleeve 13 is rotated to a suitable position, the personnel loosens the sliding column 10. Under the action of the tension of the tension spring 16, the sliding column 10 slides downward, and the sliding column 10 drives the sleeve 13 to be sleeved on the fixing bolt 15. Through the provided ratchet 14, the sleeve 13 can only rotate forward and cannot rotate reversely, and further the fixing bolt 15 cannot rotate reversely, and the fixing bolt 15 will not be loosened due to vibration reverse rotation, thereby further ensuring the stability of the overall device during operation.

[0078] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A breathing valve device for a filter, comprising: The breathing valve body (1) and the filter body (8), wherein the filter body (8) is located at the bottom of the breathing valve body (1), and the breathing valve body (1) and the filter body (8) are fixedly connected by a plurality of fixing bolts (15), characterized in that it also includes: A filter screen (2), the filter screen (2) being arranged at the bottom of the air inlet of the breathing valve body (1), a fixing column (9) being fixedly installed on the breathing valve body (1) and located on one side of a plurality of fixing bolts (15), a sliding groove (17) being provided in the fixing column (9), a sliding column (10) being movably installed in the sliding groove (17), a tension spring (16) being fixed to the inner wall of the sliding groove (17) being fixedly installed at the bottom of the sliding column (10), and an upper end of the sliding column (10) passing through the fixing column (9) and extending to the outside; A fixing component, the fixing component is located on the filter screen (2) and is used to fix the position of the filter screen (2); A power chamber (11), wherein the power chamber (11) is provided in the sliding column (10), wherein a ratchet (12) is rotatably mounted in the power chamber (11), wherein a sleeve (13) is fixedly mounted at the lower end of the ratchet (12), wherein the sleeve (13) is rotatably connected to the power chamber (11), and wherein the lower end of the sleeve (13) passes through the power chamber (11) and extends to a corresponding fixing bolt (15), wherein the sleeve (13) is sleeve-fitted with the fixing bolt (15); A plurality of limit assemblies are respectively located on a plurality of sliding posts (10) and are respectively used to limit the rotation direction of a plurality of ratchet wheels (12).

2. A breathing valve device for a filter according to claim 1, characterized in that: The fixing assembly comprises: Two rotating grooves (6), both of which are provided on the breathing valve body (1) and are located on the top of the filter screen (2), and a limit block (7) fixed to the top of the filter screen (2) is movably installed in the rotating groove (6); Two sliding grooves (3), both of which are arranged in the filter (2), a limiting column (4) is slidably installed in the sliding groove (3), a spring (5) fixed to the inner wall of the sliding groove (3) is fixedly installed at the bottom of the limiting column (4), the upper end of the limiting column (4) passes through the sliding groove (3) and extends into the breathing valve body (1), the limiting column (4) is plug-fitted with the breathing valve body (1), and one side of the limiting column (4) passes through the sliding groove (3) and extends to the outside.

3. A breathing valve device for a filter according to claim 2, characterized in that: The limiting component comprises: A ratchet pawl (14) is rotatably mounted in the power chamber (11), and one end of the ratchet pawl (14) extends between two adjacent teeth of the ratchet wheel (12).

4. A breathing valve device for a filter according to claim 1, characterized in that: A sealing rubber pad is fixedly mounted on the top of the filter screen (2).

5. A breathing valve device for a filter according to claim 2, characterized in that: The cross section of the limiting block (7) is in the shape of "7".

6. A breathing valve device for a filter according to claim 1, characterized in that: The inner cavity size of the sleeve (13) is the same as the size of the fixing bolt (15).

Images