Ventilation plug

Abstract

The utility model provides a breather plug which comprises a rubber pipe assembly, a breather cap assembly communicated with the rubber pipe assembly and a filter assembly arranged in the breather cap assembly, the rubber pipe assembly comprises a rubber pipe and a rubber pipe seat communicated with one end of the rubber pipe, and the middle of the rubber pipe is of a corrugated pipe structure; the ventilation cap assembly comprises a ventilation cavity, a ventilation pipe connected with one end of the ventilation cavity and a ventilation cap matched with the other end of the ventilation cavity, the end, away from the ventilation cavity, of the ventilation pipe is sleeved with a rubber pipe, a filtering assembly is arranged in the ventilation cavity, and the filtering assembly comprises a blocking piece, a first supporting plate, filtering cotton, a second supporting plate and a ventilation film which are sequentially arranged in a stacked mode from bottom to top; the blocking piece is arranged at the end, close to the ventilation pipe, of the ventilation cavity. The rubber pipe has good deformability and can flexibly meet the requirements of different whole vehicle layouts and pipeline directions, and the whole ventilation plug has good dustproof and waterproof capacity on the basis of effectively balancing internal and external environment pressure and can meet strict protection standard requirements.

Description

Technical Field

[0001] This utility model relates to the field of vent plug technology, and in particular to a vent plug. Background Technology

[0002] During the operation of the transmission system, an imbalance between the internal and external environmental pressures can cause many problems. When the internal pressure is lower than the external environmental pressure, a negative pressure is formed, and the sealing structure is prone to sucking in foreign objects. When the internal pressure is higher than the external environmental pressure, a positive pressure is formed, which may cause oil to leak out. Therefore, installing a vent plug to balance the air pressure between the internal and external environments of the transmission system is crucial to ensuring the normal operation of the transmission system.

[0003] The vent plug mainly consists of two structures: a pipe and a vent cap. Existing pipe designs primarily include short pipes and rigid extended pipes. Short pipe designs often result in the vent plug being positioned too low, failing to effectively block water, sand, mud, and other debris splashed from the vehicle's underside, potentially damaging the transmission system. While rigid extended pipe designs raise the vent plug's position and enhance protection, their rigid nature and fixed routing limit their application to various vehicle layouts and pipe routing requirements. Meanwhile, existing vent cap designs mainly include simple and one-way valve structures. The simple structure includes a vent pipe, a vent cap, and an mounting tube for attaching the vent cap to the vent pipe. This structure only allows airflow, its function is too limited, and its waterproof and dustproof performance is poor, failing to meet practical protection standards. The one-way valve structure performs well under positive pressure conditions, but under negative pressure conditions, it fails to effectively ensure the vent cap can smoothly draw in air to balance the internal and external environmental pressures, affecting the stability and reliability of the transmission system's air pressure balance. Therefore, there is an urgent need to develop a new type of vent plug. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a vent plug that addresses the problems in the existing technology where the vent plug's tubing design mainly consists of two forms: short tubes and rigid extended tubes. The short tube design cannot effectively block debris, while the rigid extended tube design has a fixed direction and limited application range. The vent cap design mainly consists of two forms: simple structure and one-way valve structure. The simple structure has too limited functionality and poor waterproof and dustproof effects, while the one-way valve structure is ineffective in ensuring smooth air intake under negative pressure conditions.

[0005] The purpose of this utility model is to provide a vent plug, including a hose assembly, a vent cap assembly communicating with the hose assembly, and a filter assembly disposed inside the vent cap assembly. The hose assembly includes a hose and a hose seat communicating with one end of the hose, and the middle part of the hose has a corrugated tube structure.

[0006] The ventilation cap assembly includes a ventilation cavity, a ventilation tube connected to one end of the ventilation cavity, and a ventilation cap adapted to the other end of the ventilation cavity. The end of the ventilation tube away from the ventilation cavity is fitted with the rubber tube. The ventilation cavity is provided with the filter assembly, which includes a baffle, a first support plate, filter cotton, a second support plate, and a breathable membrane stacked sequentially from bottom to top. The baffle is located on the ventilation cavity near the end of the ventilation tube.

[0007] Compared with the prior art, the beneficial effects of the vent plug of this utility model are as follows: The vent plug of this application includes a hose assembly, a vent cap assembly, and a filter assembly disposed inside the vent cap assembly. The hose in the hose assembly has a corrugated tube structure in the middle, and the hose as a whole has good deformability, which can flexibly meet the requirements of different vehicle layouts and pipeline routes, greatly improving the applicability of the vent plug in the vehicle pipeline system. Moreover, by setting a filter assembly inside the vent cap assembly, a gas filtration function is added to the entire vent plug. During the normal operation of the vent plug and the process of the vent cap balancing the internal and external environmental pressure, the filter assembly can effectively intercept impurities such as dust particles, sand particles, and liquid water droplets in the air. This design can ensure that the vent cap can effectively balance the internal and external environmental pressure, greatly improving the dustproof and waterproof capability of the vent plug, and meeting the stringent protection standard requirements.

[0008] In addition, the vent plug according to the present invention may also have the following additional technical features:

[0009] Furthermore, the baffle includes a mounting cylinder portion and at least two baffle portions integrally connected to the inner wall of the mounting cylinder portion. The two baffle portions are staggered and spaced apart inside the mounting cylinder to form an S-shaped channel for ventilation. The mounting cylinder portion and the ventilation cavity are in clearance fit.

[0010] Furthermore, the first support plate is provided with a plurality of first through holes, which are arranged in a circular array with the center of the first support plate as the center, and the first support plate and the ventilation cavity are in clearance fit.

[0011] The second support plate is provided with a plurality of second through holes, which are arranged in a circular array with the center of the second support plate as the center. The outer circumferential wall of the second support plate extends outward along the radial direction of the second support plate with at least three protrusions. The plurality of protrusions are evenly spaced along the circumference of the second support plate. The second support plate and the venting cavity are interference fit.

[0012] Furthermore, the angle between the central axis of the ventilation cavity and the central axis of the ventilation pipe is an obtuse angle, and the ventilation cavity is provided with multiple ventilation gaps at one end away from the ventilation pipe, and the multiple ventilation gaps are evenly spaced along the circumference of the ventilation cavity.

[0013] Furthermore, the ventilation cavity includes a first ventilation section, a second ventilation section connected to the first ventilation section, a cavity section connected to the second ventilation section, and a mounting section connected to the cavity section. The first ventilation section is a straight pipe structure, with one end of the first ventilation section away from the second ventilation section smoothly transitioning to one end of the ventilation pipe, and the diameter of the first ventilation section is the same as the diameter of the ventilation pipe. The second ventilation section is an inverted frustum structure. The cavity section is a cylindrical structure, and the diameter of the cavity section is larger than the diameter at the larger end of the second ventilation section. The mounting section has a stepped structure, and the ventilation cap is fitted onto the mounting section.

[0014] Furthermore, the ventilation cavity is a straight tube structure, with one end of the ventilation cavity smoothly transitioning to one end of the ventilation pipe. The diameter of the ventilation cavity is the same as the diameter of the ventilation pipe. An end protrusion is provided on the outer wall of the end of the ventilation cavity away from the ventilation pipe. An annular blocking block is also provided on the outer wall of the ventilation cavity. When the ventilation cap is placed on the ventilation cavity, a gap is provided between the bottom end face of the ventilation cap and the surface of the annular blocking block.

[0015] Furthermore, a first abutment block is provided on the outer wall of the end of the vent pipe connected to the vent cavity, and a plurality of second abutment blocks are provided on the outer wall of the end of the vent pipe away from the vent cavity. The plurality of second abutment blocks are evenly spaced along the axial direction of the vent pipe. When the rubber tube is fitted onto the vent pipe, the outer edge of the second abutment block abuts against the inner wall of the rubber tube, and the end face of the rubber tube is in close contact with the surface of the first abutment block facing away from the vent cavity.

[0016] Furthermore, the vent plug also includes a clamp assembly, which includes a mounting ring and an elastic clamp. The mounting ring includes a collar portion and a connecting portion provided on one side of the collar portion, and the connecting portion is provided with a mounting groove.

[0017] The elastic clamp is fitted onto the hose seat. The elastic clamp includes a first clamping connector and a second clamping connector integrally connected to the first clamping connector. The first clamping connector and the second clamping connector together form a receiving through hole. When the elastic clamp is in its natural state, the ends of the first clamping connector and the ends of the second clamping connector are located on the same horizontal plane, and the first clamping connector and the second clamping connector respectively abut against the end face of the mounting groove.

[0018] Furthermore, multiple limiting blocks are provided at both ends of the hose seat along the axial direction. The multiple limiting blocks are evenly spaced along the circumference of the hose seat, and the limiting blocks are used to limit the collar portion.

[0019] Furthermore, the vent plug also includes a fixing component, which includes a first fixing member and a second fixing member. The first fixing member includes a first connecting ring, a connecting post disposed on one side of the first connecting ring, and a first fixing clip rotatably connected to the first connecting ring via the connecting post. The first connecting ring is fitted onto the corrugated pipe structure. The second fixing member includes a second connecting ring and a second fixing clip disposed on one side of the second connecting ring. The second connecting ring is fitted onto the connection between the rubber tube and the vent pipe. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the vent plug according to the first embodiment of the present utility model;

[0021] Figure 2 This is an explosion diagram of the vent plug according to the first embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the rubber tube assembly in the vent plug according to the first embodiment of this utility model;

[0023] Figure 4 This is a cross-sectional schematic diagram of the vent cap assembly and filter assembly in the vent plug of the first embodiment of this utility model;

[0024] Figure 5 This is a cross-sectional view of the vent cap assembly in the vent plug according to the first embodiment of the present invention after removing the vent cap.

[0025] Figure 6 This is a schematic diagram of the baffle plate in the vent plug according to the first embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the first support plate in the vent plug of the first embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the structure of the second support plate in the vent plug of the first embodiment of this utility model;

[0028] Figure 9 This is a schematic diagram of the structure of the vent cap in the vent plug according to the first embodiment of this utility model;

[0029] Figure 10 This is a three-dimensional structural diagram of the clamp assembly in the vent plug according to the first embodiment of this utility model;

[0030] Figure 11This is a three-dimensional structural view of the first fixing member in the vent plug according to the first embodiment of the present utility model;

[0031] Figure 12 This is a three-dimensional structural view of the second fixing member in the vent plug according to the first embodiment of this utility model;

[0032] Figure 13 This is a three-dimensional structural diagram of the vent plug according to the second embodiment of the present invention;

[0033] Figure 14 This is a cross-sectional schematic diagram of the ventilator assembly according to the second embodiment of the present invention.

[0034] The above-mentioned figures include the following reference numerals: 10-Hose assembly; 11-Hose; 12-Hose seat; 13-Limiting block; 20-Ventilator cap assembly; 21-Ventilator cavity; 211-First ventilator; 212-Second ventilator; 213-Cavity; 214-Mounting part; 215-Ventilator notch; 216-End protrusion; 217-Annular blocking block; 22-Ventilator tube; 23-Ventilator cap; 231-Cover plate; 232-Outer ring; 233-Inner ring; 234-Limiting protrusion; 24-First abutment block; 25-Second abutment block; 30-Filter assembly; 31-Baffle; 311-Mounting 312-Cylinder section; 32-First support plate; 321-First through hole; 33-Filter cotton; 34-Second support plate; 341-Second through hole; 342-Protrusion; 35-Breathable membrane; 40-Clamp assembly; 41-Mounting ring; 411-Loop section; 412-Connecting section; 413-Mounting groove; 42-Elastic clamp; 421-First clamping connector; 422-Second clamping connector; 50-Fixing assembly; 51-First fixing member; 511-First connecting ring; 512-Connecting column; 513-First fixing clip; 52-Second fixing member; 521-Second connecting ring; 522-Second fixing clip.

[0035] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0036] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0037] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] Example 1

[0040] Please see Figures 1 to 12 The image shows a vent plug according to the first embodiment of the present invention, including a hose assembly 10, a vent cap assembly 20 communicating with the hose assembly 10, and a filter assembly 30 disposed inside the vent cap assembly 20. The hose assembly 10 includes a hose 11 and a hose seat 12 communicating with one end of the hose 11. In this embodiment, the hose 11 is integrally molded from a soft material, and the middle part of the hose 11 has a corrugated structure. The design of the corrugated structure improves the deformability of the hose 11, so that the hose 11 can flexibly meet the requirements of different vehicle layouts and pipeline routes, with high applicability and a wide range of applications.

[0041] As an example, the ventilator cap assembly 20 includes a ventilator chamber 21, a ventilator tube 22 connected to one end of the ventilator chamber 21, and a ventilator cap 23 adapted to the other end of the ventilator chamber 21. A rubber tube 11 is fitted onto the end of the ventilator tube 22 away from the ventilator chamber 21, and a filter assembly 30 is provided inside the ventilator chamber 21. Specifically, the angle between the central axis of the ventilator chamber 21 and the central axis of the ventilator tube 22 is an obtuse angle. In this embodiment, the angle between the central axis of the ventilator chamber 21 and the central axis of the ventilator tube 22 is 105°. The end of the ventilator chamber 21 away from the ventilator tube 22 is provided with multiple venting notches 215, which are evenly spaced along the circumference of the ventilator chamber 21.

[0042] Further, the ventilation chamber 21 includes a first ventilation section 211, a second ventilation section 212 connected to the first ventilation section 211, a cavity section 213 connected to the second ventilation section 212, and a mounting section 214 connected to the cavity section 213. The central axes of the first ventilation section 211, the second ventilation section 212, the cavity section 213, and the mounting section 214 coincide. In this embodiment, the first ventilation section 211 has a straight pipe structure, and one end of the first ventilation section 211 away from the second ventilation section 212 is smoothly connected to one end of the ventilation pipe 22, and the diameter of the first ventilation section 211 is the same as the diameter of the ventilation pipe 22. The second ventilation section 212 has an inverted frustum structure, and the small end of the second ventilation section 212 is connected to the end of the first ventilation section 211 away from the ventilation pipe 22, and the large end of the second ventilation section 212 is connected to the cavity section 213. The cavity 213 has a cylindrical structure, and its diameter is larger than the diameter at the larger end of the second vent 212. The mounting part 214 has a stepped structure, and a vent cap 23 is fitted onto the mounting part 214.

[0043] Furthermore, the vent cap 23 includes a cover plate portion 231, an outer ring portion 232 extending vertically outward from the circumferential outer edge of the cover plate portion 231, and an inner ring portion 233 extending vertically outward from the plate surface of the cover plate portion 231. The outer ring portion 232 and the inner ring portion 233 are disposed on the same side of the cover plate portion 231, and there is a gap between the outer ring portion 232 and the inner ring portion 233. The end of the outer ring portion 232 away from the cover plate portion 231 extends beyond the end of the inner ring portion 233 away from the cover plate portion 231. It can also be understood that the total height of the outer ring portion 232 is greater than the total height of the inner ring portion 233. It should be noted that the outer ring 232 is designed to facilitate the operator's grip and rotation, and the inner ring 233 is adapted to the mounting part 214 so that the vent cap 23 can be placed on the vent cavity 21, thereby sealing the top end of the vent cavity 21 with the vent cap 23, which can play a role in waterproofing and dustproofing. In order to improve the connection stability between the vent cap 23 and the vent cavity 21, a limiting protrusion 234 is provided on the inner wall of the end of the inner ring 233 away from the cover plate 231. In this embodiment, the limiting protrusion 234 is a full-circle ring structure. When the vent cap 23 is placed on the top end of the vent cavity 21, the position of the limiting protrusion 234 is lower than the position of the mounting part 214 in the vent cavity 21 covered by the vent cap 23.

[0044] Furthermore, a first abutment block 24 is provided on the outer wall of the end of the vent pipe 22 that is connected to the vent cavity 21, and a plurality of second abutment blocks 25 are provided on the outer wall of the end of the vent pipe 22 that is away from the vent cavity 21. The plurality of second abutment blocks 25 are evenly spaced along the axial direction of the vent pipe 22. As a specific example, in this embodiment, the first abutment block 24 is an annular plate structure. When the rubber tube 11 is fitted onto the vent pipe 22, the outer edge of the second abutment block 25 abuts against the inner wall of the rubber tube 11, and the end face of the rubber tube 11 is in close contact with the side surface of the first abutment block 24 that is away from the vent cavity 21.

[0045] As an example, the filter assembly 30 includes a baffle 31, a first support plate 32, a filter cotton 33, a second support plate 34, and a breathable membrane 35 stacked sequentially from bottom to top. The baffle 31 is located on the ventilation cavity 21 near the end of the ventilation pipe 22. Specifically, the baffle 31, the first support plate 32, and the filter cotton 33 are stacked sequentially from bottom to top within the cavity portion 213 of the ventilation cavity 21. The top end of the filter cotton 33 is flush with the end face of the top end of the cavity portion 213. In this embodiment, the filter cotton 33 is an oil-absorbing filter cotton 33. Further, the second support plate 34 is located on the end face of the top end of the cavity portion 213, and the breathable membrane 35 is located on the stepped surface of the mounting portion 214. In this embodiment, the breathable membrane 35 is fixed to the stepped surface of the mounting portion 214 by welding to seal the top end of the ventilation cavity 21.

[0046] Furthermore, the baffle 31 includes a mounting cylinder portion 311 and at least two baffle portions 312 integrally connected to the inner wall of the mounting cylinder portion 311. The multiple baffle portions 312 are staggered and spaced apart inside the mounting cylinder to form an S-shaped channel for ventilation. The mounting cylinder portion 311 and the ventilation cavity 21 are in clearance fit. As a specific example, in this embodiment, two baffle portions 312 are provided inside the mounting cylinder. The baffle portions 312 are semi-circular plate-shaped structures, and the two baffle portions 312 are respectively located on the inner walls of both sides of the mounting cylinder, with a gap between the two baffle portions 312.

[0047] Furthermore, the first support plate 32 is provided with a plurality of first through holes 321, which are arranged in a circular array with the center of the first support plate 32 as the center. The first support plate 32 and the venting cavity 21 are in clearance fit. As a specific example, in this embodiment, the first support plate 32 is provided with eight first through holes 321, which are arranged in a circular array with the center of the first support plate 32 as the center.

[0048] The second support plate 34 has a plurality of second through holes 341, which are arranged in a circular array with the center of the second support plate 34 as the center. At least three protrusions 342 extend radially outward from the circumferential outer wall of the second support plate 34, and the protrusions 342 are evenly spaced along the circumference of the second support plate 34. The second support plate 34 and the venting cavity 21 are interference-fitted. As a specific example, in this embodiment, the second support plate 34 has four second through holes 341, which are arranged in a circular array with the center of the second support plate 34 as the center. Four protrusions 342 are spaced apart on the circumferential outer wall of the second support plate 34. It should be noted that the breathable membrane 35 in the filter assembly 30 of this embodiment is only breathable and not waterproof, which can effectively improve the dustproof and waterproof capabilities of the entire vent plug. At the same time, the filter cotton 33 located inside the vent cavity 21 and the S-shaped channel on the baffle 31 can effectively reduce the pollution of the breathable membrane 35 by oil and gas, thereby improving its service life.

[0049] The vent plug of this application also includes a clamp assembly 40, which includes a mounting ring 41 and an elastic clamp 42. The elastic clamp 42 is fitted onto the hose seat 12. The mounting ring 41 includes a collar portion 411 and a connecting portion 412 located on one side of the collar portion 411. The connecting portion 412 is provided with a mounting groove 413. In this embodiment, multiple limiting blocks 13 are provided at both ends of the hose seat 12 in the axial direction. The multiple limiting blocks 13 are evenly spaced along the circumference of the hose seat 12. The limiting blocks 13 are used to limit the elastic clamp 42 so that the position of the elastic clamp 42 can be restricted between the two ends of the hose seat 12, effectively preventing the elastic clamp 42 from detaching from the hose seat 12 during use, thereby achieving a stable connection between the clamp assembly 40 and the hose seat 12.

[0050] Furthermore, the elastic clamp 42 includes a first locking connector 421 and a second locking connector 422 integrally connected to the first locking connector 421. The first locking connector 421 and the second locking connector 422 together form a receiving through hole. When the elastic clamp 42 is in its natural state, the ends of the first locking connector 421 and the second locking connector 422 are located on the same horizontal plane. It can also be understood that the ends of the first locking connector 421 and the second locking connector 422 are in a straight line. The first locking connector 421 and the second locking connector 422 respectively abut against the end face of the mounting groove 413 to realize the locking between the elastic clamp 42 and the mounting ring 41. In this way, no additional tools are required during assembly. The elastic clamp 42 can be fixed to the external device simply by removing the first locking connector 421 and the second locking connector 422 of the elastic clamp 42 from the mounting groove 413 in the mounting ring 41, which improves the assembly convenience of the vent plug.

[0051] The vent plug of this application also includes a fixing component 50, which includes a first fixing member 51 and a second fixing member 52. The design of the first fixing member 51 and the second fixing member 52 facilitates fixing the hose assembly at different positions on the vehicle transmission system to form different pipeline routes. Specifically, in this embodiment, the first fixing member 51 includes a first connecting ring 511, a connecting post 512 disposed on one side of the first connecting ring 511, and a first fixing clip 513 rotatably connected to the first connecting ring 511 through the connecting post 512. The first connecting ring 511 is fitted onto the corrugated pipe structure. In actual use, the first connecting ring 511 and the first fixing clip 513 can rotate 360° relative to each other under the action of the connecting post 512. The first connecting ring 511 can move freely on the corrugated pipe structure in the middle of the hose 11. The second fastener 52 includes a second connecting ring 521 and a second fixing clip 522 disposed on one side of the second connecting ring 521. The second connecting ring 521 is sleeved at the connection between the hose 11 and the vent pipe 22 to improve the connection stability between the hose assembly 10 and the vent cap assembly 20.

[0052] In summary, the beneficial effects of the vent plug in the above embodiments of this utility model are as follows: The vent plug of this application includes a hose assembly, a vent cap assembly, and a filter assembly disposed inside the vent cap assembly. The hose in the hose assembly has a corrugated structure in the middle, and the hose as a whole has good deformability, which can flexibly meet the requirements of different vehicle layouts and pipeline routes, greatly improving the applicability of the vent plug in the vehicle pipeline system, reducing the installation difficulties caused by layout limitations, and providing more flexibility and convenience for the design and manufacturing of the whole vehicle. Furthermore, by setting a filter assembly inside the vent cap assembly... This component adds a gas filtration function to the entire vent plug. During the normal operation of the vent plug and the process of the vent cap balancing the internal and external environmental pressure, the filter component can effectively intercept impurities such as dust particles, sand particles, and liquid water droplets in the air. This design can greatly improve the dustproof and waterproof capabilities of the vent plug while ensuring that the vent cap can effectively balance the internal and external environmental pressure. It can meet the stringent protection standards, effectively protect the connected equipment or pipeline system, extend its service life, reduce the failure rate caused by dust and moisture intrusion, and improve the stability and reliability of the entire system.

[0053] Example 2

[0054] Please refer to Figures 13 to 14The image shows a vent plug in the second embodiment of this utility model. The difference between the vent plug in this embodiment and the vent plug in the first embodiment is that the vent cavity 21 is a straight tube structure, with one end of the vent cavity 21 smoothly connected to one end of the vent pipe 22. The diameter of the vent cavity 21 is the same as the diameter of the vent pipe 22. An end protrusion 216 is provided on the outer wall of the end of the vent cavity 21 furthest from the vent pipe 22. An annular blocking block 217 is also provided on the outer wall of the vent cavity 21. When the vent cap 23 is placed on the vent cavity 21, a gap is provided between the bottom end face of the vent cap 23 and the surface of the annular blocking block 217. More specifically, as shown... Figure 13 As shown, when the vent cap 23 is placed on the vent cavity 21, the cover plate portion 231 of the vent cap 23 abuts against the end face of the vent cavity 21, and the position of the limiting protrusion 234 on the inner ring portion 233 is lower than the end protrusion 216 on the vent cavity 21. The total height of the outer ring portion 232 is greater than the total height of the inner ring portion 233. There is a gap between the bottom end face of the outer ring portion 232 and the surface of the annular blocking block 217. It should be noted that the design structure of the vent cavity 21 in this embodiment is simpler than that of the vent cavity 21 in the first embodiment, which greatly reduces the manufacturing cost and can be applied to transmission systems with low requirements for waterproofing and dustproofing.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A vent plug, characterized in that, The application relates to a breathing cap assembly and a filter assembly arranged inside the breathing cap assembly, and a rubber tube assembly in communication with the breathing cap assembly. The breathing cap assembly comprises a breathing cavity, a breathing pipe connected with one end of the breathing cavity, and a breathing cap matched with the other end of the breathing cavity, the rubber tube is sleeved on the end of the breathing pipe away from the breathing cavity, the filter assembly is arranged in the breathing cavity, and the filter assembly comprises, from bottom to top, a baffle, a first supporting plate, filter cotton, a second supporting plate and a breathable film.

2. The breather plug of claim 1, wherein, The baffle comprises a mounting cylinder and at least two baffle plates integrally connected with the inner wall of the mounting cylinder, the two baffle plates are arranged in the mounting cylinder in a staggered and spaced manner to form an S-shaped channel for breathing, and the mounting cylinder is in clearance fit with the breathing cavity.

3. The breather plug of claim 1, wherein, The first supporting plate is provided with a plurality of first through holes which are arranged in a circular array with the center of the first supporting plate as the center, and the first supporting plate is in clearance fit with the breathing cavity. The second supporting plate is provided with a plurality of second through holes which are arranged in a circular array with the center of the second supporting plate as the center, the circumferential outer wall of the second supporting plate extends outward along the radial direction of the second supporting plate and is provided with at least three protrusions which are uniformly and spacedly arranged along the circumferential direction of the second supporting plate, and the second supporting plate is in interference fit with the breathing cavity.

4. The breather plug of claim 1, wherein, The included angle between the central axis of the breathing cavity and the central axis of the breathing pipe is obtuse, and the end of the breathing cavity away from the breathing pipe is provided with a plurality of breathing notches which are uniformly and spacedly arranged along the circumferential direction of the breathing cavity.

5. The breather plug of claim 4, wherein, The breathing cavity comprises a first breathing part, a second breathing part connected with the first breathing part, a cavity part connected with the second breathing part, and a mounting part connected with the cavity part, wherein the first breathing part is a straight pipe structure, the end of the first breathing part away from the second breathing part is smoothly and transitionally connected with one end of the breathing pipe, and the diameter of the first breathing part is consistent with the diameter of the breathing pipe; the second breathing part is a rounded table structure; the cavity part is a cylindrical structure, and the diameter of the cavity part is greater than the diameter of the large end of the second breathing part; and the mounting part is a stepped structure, and the breathing cap is sleeved on the mounting part.

6. The breather plug of claim 4, wherein, The breathing cavity is a straight pipe structure, one end of the breathing cavity is smoothly and transitionally connected with one end of the breathing pipe, the diameter of the breathing cavity is consistent with the diameter of the breathing pipe, the end of the outer wall of the end of the breathing cavity away from the breathing pipe is provided with an end protrusion, and the outer wall of the breathing cavity is further provided with an annular blocking block, and when the breathing cap is arranged on the breathing cavity, a gap is formed between the bottom end surface of the breathing cap and the surface of the annular blocking block.

7. The breather plug of claim 1, wherein, The outer wall of one end of the vent pipe connected with the vent cavity is provided with a first abutting block, and the outer wall of the other end of the vent pipe away from the vent cavity is provided with a plurality of second abutting blocks, which are uniformly and spacedly arranged along the axial direction of the vent pipe. When the rubber tube is sleeved on the vent pipe, the outer edge of the second abutting block abuts against the inner wall of the rubber tube, and the end surface of the rubber tube is tightly attached to the side surface of the first abutting block away from the vent cavity.

8. The vent plug of claim 1, wherein, The vent plug further comprises a clamp assembly, the clamp assembly comprises a mounting ring and an elastic clamp, the mounting ring comprises a sleeve ring part and a connecting part provided on one side of the sleeve ring part, and the connecting part is provided with a mounting groove; The elastic clamp is sleeved on the rubber tube seat, the elastic clamp comprises a first clamping joint and a second clamping joint integrally connected with the first clamping joint, and the first clamping joint and the second clamping joint form a containing through hole. When the elastic clamp is in a natural state, the end of the first clamping joint and the end of the second clamping joint are located on the same horizontal plane, and the first clamping joint and the second clamping joint respectively abut against the end surface of the mounting groove.

9. The breather plug of claim 8, wherein, The two ends of the rubber tube seat in the axial direction are respectively provided with a plurality of limiting blocks, and the plurality of limiting blocks are uniformly and spacedly arranged along the circumferential direction of the rubber tube seat. The limiting blocks are used for limiting the sleeve ring part.

10. The vent plug of claim 1, wherein, The vent plug further comprises a fixing assembly, the fixing assembly comprises a first fixing member and a second fixing member, the first fixing member comprises a first connecting ring, a connecting column provided on one side of the first connecting ring, and a first fixing clamp rotationally connected with the first connecting ring through the connecting column, and the first connecting ring is sleeved on the corrugated pipe structure; the second fixing member comprises a second connecting ring and a second fixing clamp provided on one side of the second connecting ring, and the second connecting ring is sleeved on the connection between the rubber tube and the vent pipe.

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