Waterproof and breathable valve

Abstract

The utility model discloses a waterproof and breathable valve, it includes valve body, valve core subassembly and valve cap, this valve body has the valve cavity of top end opening and the valve hole extending to the bottom end from this valve cavity, this valve core subassembly includes core body, first waterproof and breathable membrane and second waterproof and breathable membrane, this core body has the core hole, this first waterproof and breathable membrane and this second waterproof and breathable membrane are set up respectively in the opposite both ends of this core body, for the two openings of closed this core hole, this valve core subassembly is installed in this valve cavity of this valve body, the core hole of this core body is passed through first waterproof and breathable membrane and the valve hole of this valve body intercommunication, the valve cap is installed in this valve body in the way of pressing this second waterproof and breathable membrane, and this waterproof and breathable valve forms first air passage between this valve cap and this core body, forms second air passage between this valve cap and this valve body, the core hole of this core body is passed through second waterproof and breathable membrane and the inner end of first air passage intercommunication, and the outer end of first air passage and second air passage intercommunication.

Description

Technical Field

[0001] This utility model relates to a valve body, and more particularly to a waterproof and breathable valve. Background Technology

[0002] In fields such as hydrological monitoring instruments, automotive parts, and outdoor machinery, equipment typically requires gas exchange with the external environment to balance internal and external air pressure and prevent deformation or damage to components due to pressure differences. Therefore, waterproof and breathable valves, which achieve "gas passage and moisture barrier," are widely used in these devices. For example, in Chinese utility model patent CN203743558U, the inventors disclosed a waterproof and breathable valve comprising a top cover, a body, a waterproof and breathable membrane, and a sealing ring. The top cover has an assembly pressure surface and several vent holes. The body has an mounting surface at the top, a hexagonal prism in the middle, and an installation tube at the bottom. The waterproof and breathable membrane is mounted on the mounting surface, and a circular arc groove is provided at the connection between the hexagonal prism and the installation tube. The sealing ring is installed in the circular arc groove. The existing waterproof and breathable valve technology only contains a single waterproof and breathable membrane, resulting in limited waterproof performance. It is only suitable for normal, dry, low-humidity environments. In high-humidity, high-moisture environments, such as at sea, moisture can easily enter the device through the valve, causing internal electronic components to malfunction due to moisture. Furthermore, because the existing waterproof and breathable valve only contains a single membrane, its fault tolerance is low. Specifically, its waterproof and breathable effect depends on the integrity of the single membrane, requiring high precision in its production (e.g., uniformity of membrane thickness, consistency of micropore size) and installation process. For example, any deviation in the installation position of the membrane will inevitably lead to a decrease in its performance. Therefore, the inventors of this invention aim to develop a waterproof and breathable valve with better waterproof performance and a higher fault tolerance. Utility Model Content

[0003] One objective of this invention is to provide a waterproof and breathable valve, wherein the waterproof and breathable valve has better waterproof performance and higher fault tolerance.

[0004] One objective of this invention is to provide a waterproof and breathable valve, wherein the waterproof and breathable valve provides two layers of waterproof and breathable membranes to improve the waterproof performance and fault tolerance of the waterproof and breathable valve.

[0005] One objective of this utility model is to provide a waterproof and breathable valve, wherein the waterproof and breathable valve first sets two layers of waterproof and breathable membranes at opposite ends of the core to form a valve core assembly, and then installs the valve core assembly, valve body and valve cap. In this way, the waterproof and breathable valve can avoid the problem of misalignment of the waterproof and breathable membrane and avoid the failure of the waterproof and breathable membrane.

[0006] According to one aspect of this utility model, a waterproof and breathable valve is provided, comprising: A valve body, wherein the valve body has a valve cavity with an opening at the top and a valve port extending from the valve cavity to the bottom; A valve core assembly, wherein the valve core assembly includes a core body, a first waterproof and breathable membrane, and a second waterproof and breathable membrane, the core body having a core hole, the first waterproof and breathable membrane and the second waterproof and breathable membrane being respectively disposed at opposite ends of the core body to close the two openings of the core hole, wherein the valve core assembly is installed in the valve cavity of the valve body, and the core hole of the core body communicates with the valve hole of the valve body through the first waterproof and breathable membrane; and A valve cap is installed on the valve body in such a way that it presses against the second waterproof and breathable membrane. The waterproof and breathable valve forms a first air passage between the valve cap and the core, and a second air passage between the valve cap and the valve body. The core hole of the core is connected to the inner end of the first air passage through the second waterproof and breathable membrane, and the outer end of the first air passage is connected to the second air passage.

[0007] According to one embodiment of the present invention, the valve body includes a main body portion and an assembly ring extending upward from the main body portion. The valve body forms the valve cavity between the main body portion and the assembly ring. The valve hole is formed in the main body portion. The valve cap includes a top cover, a pressing block extending downward from the center of the top cover, and a peripheral wall extending downward from the edge of the top cover. The peripheral wall of the valve cap is mounted on the assembly ring of the valve body. A second air passage is formed between the peripheral wall and the assembly ring. A first air passage is formed between the top cover and the core. The pressing block presses down on the second waterproof and breathable membrane.

[0008] According to one embodiment of the present invention, the assembly ring of the valve body has at least one top notch and at least one side notch, the top notch and the side notch of the assembly ring forming a second air passage between the valve cap and the valve body, wherein, from a side view, the peripheral wall blocks the top notch of the assembly ring.

[0009] According to one embodiment of the present invention, the core has a core groove, the second waterproof and breathable membrane is located in the core groove of the core, the outer diameter of the pressure block of the valve cap is smaller than the inner diameter of the core groove of the core, and the sum of the height of the pressure block and the thickness of the edge of the second waterproof and breathable membrane is greater than the depth of the core groove of the core.

[0010] According to one embodiment of the present invention, the assembly ring of the valve body has a supporting step, and the core has an abutting step, wherein the abutting step of the core is abutted against the supporting step of the assembly ring.

[0011] According to one embodiment of the present invention, the assembly ring of the valve body has an annular groove, and the inner wall of the peripheral wall of the valve cap is provided with a set of buckling protrusions, the buckling protrusions protruding into the annular groove of the assembly ring.

[0012] According to one embodiment of the present invention, the main body portion of the valve body has at least one positioning portion, which is a boss or a groove.

[0013] According to another aspect of this utility model, this utility model further provides a waterproof and breathable valve, which includes: A pressure ring, wherein the pressure ring has an annular channel; A valve body, wherein the valve body has a valve cavity with an opening at the top and a valve port extending from the valve cavity to the bottom; A valve core assembly, wherein the valve core assembly includes a core body, a first waterproof and breathable membrane, and a second waterproof and breathable membrane. The core body has a core hole. The first and second waterproof and breathable membranes are respectively disposed at opposite ends of the core body to close the two openings of the core hole. The valve core assembly is installed in the valve cavity of the valve body. The core hole of the core body communicates with the valve hole of the valve body through the first waterproof and breathable membrane. A pressure ring is stacked on the edge portion of the second waterproof and breathable membrane. The core hole of the core body communicates with the annular channel of the pressure ring through the second waterproof and breathable membrane. A valve cap is installed on the valve body in such a way as to press against the pressure ring. The waterproof and breathable valve forms a first air passage between the valve cap and the core, a second air passage between the valve cap and the valve body, and a third air passage between the valve cap and the pressure ring. The ring body channel of the pressure ring, the third air passage, the first air passage and the second air passage are connected in sequence.

[0014] According to one embodiment of the present invention, the valve body includes a main body portion and an assembly ring extending upward from the main body portion. The valve body forms the valve cavity between the main body portion and the assembly ring. The valve hole is formed in the main body portion. The valve cap includes a top cover, a pressing block extending downward from the center of the top cover, and a peripheral wall extending downward from the edge of the top cover. The peripheral wall of the valve cap is mounted on the assembly ring of the valve body. A second air passage is formed between the peripheral wall and the assembly ring. A first air passage is formed between the top cover and the core. The pressing block presses down on the pressing ring. A third air passage is formed between the pressing block and the pressing ring.

[0015] According to one embodiment of the present invention, the pressure block of the valve cap has at least one venting notch, the venting notch forming the third air passage between the pressure block and the pressure ring; or the pressure ring has at least one venting notch, the venting notch forming the third air passage between the pressure block and the pressure ring. Attached Figure Description

[0016] Figure 1 This is a perspective view of a waterproof and breathable valve according to a preferred embodiment of the present invention.

[0017] Figure 2 This is a perspective view of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0019] Figure 4 This is an exploded view of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0020] Figure 5 This is a cross-sectional schematic diagram of one position of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0021] Figure 6 This is a cross-sectional view of another position of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0022] Figure 7 This is an exploded view of a modified example of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0023] Figure 8 This is an exploded view from another perspective of a modified example of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention.

[0024] Figure 9 This is a cross-sectional schematic diagram of one position of the modified example of the waterproof and breathable valve according to the above-described preferred embodiment of the present invention. Detailed Implementation

[0025] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof herein is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0026] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0027] Refer to the accompanying drawings of the specification of this utility model. Figures 1 to 6 A preferred embodiment of the present invention will be disclosed and described in the following description, wherein the waterproof and breathable valve includes a valve body 10, a valve core assembly 20 and a valve cap 30.

[0028] Specifically, the valve body 10 has a valve cavity 101 and a valve hole 102. The opening of the valve cavity 101 is located at the top end of the valve body 10, and the opening of the valve hole 102 is located at the bottom end of the valve body 10. The valve cavity 101 and the valve hole 102 are connected. That is, the valve hole 102 of the valve body 10 extends downward from the valve cavity 101 to the bottom end of the valve body 10.

[0029] The valve core assembly 20 includes a first waterproof and breathable membrane 21, a second waterproof and breathable membrane 22, and a core 23. The core 23 has a core hole 231. The first waterproof and breathable membrane 21 is disposed at the bottom end of the core 23 to close the opening of the core hole 231 at the bottom end of the core 23. The second waterproof and breathable membrane 22 is disposed at the top end of the core 23 to close the opening of the core hole 231 at the top end of the core 23. The valve core assembly 20 is installed in the valve cavity 101 of the valve body 10. The core hole 231 of the core 23 communicates with the valve hole 102 of the valve body 10 through the first waterproof and breathable membrane 21.

[0030] The valve cap 30 is installed on the valve body 10, and the valve cap 30 presses against the second waterproof and breathable membrane 22. The waterproof and breathable valve forms a first air passage 40 between the valve cap 30 and the core 23, and a second air passage 50 between the valve cap 30 and the valve body 10. The core hole 231 of the core 23 is connected to the inner end of the first air passage 40 through the second waterproof and breathable membrane 22, and the outer end of the first air passage 40 is connected to the second air passage 50.

[0031] After the waterproof and breathable valve is installed on the equipment, if the air pressure inside the equipment is higher than the air pressure of the external environment, the air inside the equipment flows through the valve hole 102 of the valve body 10, the first waterproof and breathable membrane 21, the core hole 231 of the core body 23, the second waterproof and breathable membrane 22, the first air passage 40, and the second air passage 50 in sequence before being discharged to the external environment to balance the air pressure inside and outside the equipment. Conversely, if the air pressure inside the equipment is lower than the air pressure of the external environment, the air from the external environment flows through the second air passage 50, the first air passage 40, the second waterproof and breathable membrane 22, the core hole 231 of the core body 23, the first waterproof and breathable membrane 21, and the valve hole 102 of the valve body 10 before entering the equipment to balance the air pressure inside and outside the equipment.

[0032] Unlike existing technologies, firstly, the waterproof and breathable valve of this invention provides a first waterproof and breathable membrane 21 and a second waterproof and breathable membrane 22. As air from the external environment enters the equipment through the waterproof and breathable valve, it is filtered sequentially by the second waterproof and breathable membrane 22 and the first waterproof and breathable membrane 21, effectively preventing moisture from entering the equipment, thus giving the waterproof and breathable valve of this invention better waterproof performance. Secondly, because the waterproof and breathable valve of this invention provides the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22, even if the manufacturing precision of the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 is low, the cooperation between the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 can still ensure the waterproof performance of the waterproof and breathable valve, thereby improving the fault tolerance of the waterproof and breathable valve. Thirdly, when assembling the waterproof and breathable valve, the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 can be first placed on the core 23. The valve core assembly 20 is obtained by taking the opposite ends of the valve body 10, the valve core assembly 20 and the valve cap 30, and then the valve body 10, the valve core assembly 20 and the valve cap 30 are assembled to ensure that the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 can reliably seal the two openings of the core hole 231 of the core body 23, thereby avoiding the situation where the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 cannot seal the two openings of the core hole 231 of the core body 23 due to misalignment during assembly; Fourth, the edge portion of the first waterproof and breathable membrane 21 is clamped between the bottom of the valve body 10 and the core body 23, and the edge portion of the second waterproof and breathable membrane 22 is clamped between the valve cap 30 and the top of the core body 23. Therefore, during use, the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 will not shift, so as to ensure that the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 can reliably seal the two openings of the core hole 231 of the core body 23.

[0033] Preferably, adhesive can be used to bond the first waterproof and breathable membrane 21 and the second waterproof and breathable membrane 22 to the opposite ends of the core 23. This prevents the first waterproof and breathable membrane 21 and / or the second waterproof and breathable membrane 22 from detaching from the core 23 during the assembly of the valve body 10, the valve core assembly 20, and the valve cap 30. It also prevents misalignment of the first waterproof and breathable membrane 21 and / or the second waterproof and breathable membrane 22 during assembly. Therefore, after the waterproof and breathable valve is assembled, it ensures that the first waterproof and breathable membrane 21 is positioned to close the bottom opening of the core hole 231 of the core 23, and that the second waterproof and breathable membrane 22 is positioned to close the top opening of the core hole 231 of the core 23.

[0034] Further, the valve body 10 includes a main body portion 11 and an assembly ring 12 extending upward from the main body portion 11. The valve body 10 forms the valve cavity 101 between the main body portion 11 and the assembly ring 12, and the valve hole 102 of the valve body 10 is formed in the main body portion 11. (See attached...) Figures 1 to 6 In the specific example of the waterproof and breathable valve of this utility model shown, the main body portion 11 of the valve body 10 and the assembly ring 12 are integral. Preferably, the bottom of the main body portion 11 of the valve body 10 has a threaded post 111 for a nut, so as to facilitate the installation of the waterproof and breathable valve on the equipment.

[0035] Continue to refer to the appendix Figures 3 to 6 The valve cap 30 includes a top cover 31, a pressing block 32, and a peripheral wall 33. The pressing block 32 extends downward from the center of the top cover 31, and the peripheral wall 33 extends downward from the edge of the top cover 31. (See attached...) Figures 1 to 6 In the specific example of the waterproof and breathable valve of this utility model shown, the top cover 31, the pressure block 32, and the peripheral wall 33 of the valve cap 30 are integral.

[0036] The peripheral wall 33 of the valve cap 30 is mounted on the assembly ring 12 of the valve body 10 to install the valve cap 30 on the valve body 10. The second air passage 50 is formed between the peripheral wall 33 and the assembly ring 12, and the first air passage 40 is formed between the top cover 31 and the core 23. The pressure block 32 presses down on the second waterproof and breathable membrane 22 to prevent the second waterproof and breathable membrane 22 from being misaligned, so that the second waterproof and breathable membrane 22 can reliably seal the top opening of the core hole 231 of the core 23.

[0037] Reference Appendix Figures 4 to 6 The valve body 10 has an annular groove 121 in its assembly ring 12. The valve cap 30 has a set of protrusions 331 on its inner wall of its peripheral wall 33. These protrusions 331 protrude into the annular groove 121 of the assembly ring 12, reliably mounting the peripheral wall 33 to the assembly ring 12, thereby preventing the valve cap 30 from detaching from the valve body 10. Optionally, in other examples of the waterproof and breathable valve of this invention, the peripheral wall 33 of the valve cap 30 can be screwed onto the assembly ring 12 of the valve body 10. Optionally, in other examples of the waterproof and breathable valve of this invention, based on the friction between the peripheral wall 33 and the assembly ring 12, the peripheral wall 33 of the valve cap 30 can be mounted onto the assembly ring 12 of the valve body 10.

[0038] Reference Appendix Figures 3 to 5The assembly ring 12 of the valve body 10 has at least one top notch 122 and at least one side notch 123. After the valve cap 30 is installed on the assembly ring 12 of the valve body 10, the top notch 122 and the side notch 123 of the assembly ring 12 can ensure that the second air passage 50 is formed between the valve cap 30 and the valve body 10.

[0039] Reference Appendix Figure 5 The peripheral wall 33 of the valve cap 30 extends below the top notch 122 of the assembly ring 12 of the valve body 10. From a side view, the peripheral wall 33 of the valve cap 30 covers the top notch 122 of the assembly ring 12. Thus, when the waterproof and breathable valve is installed in equipment used in a marine environment, the crystals formed by salt in the marine environment on the surface of the waterproof and breathable valve are less likely to block the top notch 122 of the assembly ring 12, thereby preventing the waterproof and breathable valve from failing.

[0040] Reference Appendix Figure 5 and Figure 6 The valve core assembly 20 has a core groove 232 in its core body 23, and the second waterproof and breathable membrane 22 is located in the core groove 232 of the core body 23. The outer diameter of the pressure block 32 of the valve cap 30 is smaller than the inner diameter of the core groove 232 of the core body 23, and the sum of the height of the pressure block 32 and the thickness of the edge of the second waterproof and breathable membrane 22 is greater than the depth of the core groove 232 of the core body 23. Therefore, after the valve cap 30 is installed on the assembly ring 12 of the valve body 10, the waterproof and breathable valve can ensure that the first air passage 40 is formed between the top cover 31 and the core body 23.

[0041] Continue to refer to the appendix Figure 5 and Figure 6 The valve body 10 has an assembly ring 12 with a support step 124 and a core 23 with an overlap step 233. The overlap step 233 of the core 23 is overlapped with the support step 124 of the assembly ring 12. In this way, the waterproof and breathable valve can ensure that the pressure of the core 23 and the valve body 10 on the edge of the first waterproof and breathable membrane 21 is controllable.

[0042] Reference Appendix Figure 2 and Figure 4 The main body portion 11 of the valve body 10 has at least one positioning portion 112. When the waterproof and breathable valve is installed on the equipment, the positioning portion 112 of the main body portion 11 of the valve body 10 can achieve positioning between the waterproof and breathable valve and the equipment, preventing the waterproof and breathable valve from rotating relative to the equipment. (See attached...) Figures 1 to 6In this specific example of the waterproof and breathable valve of the present invention, the positioning part 112 of the main body 11 is a boss. It is understood that because the positioning part 112 of the main body 11 is a boss, the waterproof and breathable valve requires a corresponding groove in the device for the positioning part 112 to be inserted, thus achieving positioning between the waterproof and breathable valve and the device. Optionally, in other examples of the waterproof and breathable valve of the present invention, the positioning part 112 of the main body 11 is a groove. It is understood that because the positioning part 112 of the main body 11 is a groove, the waterproof and breathable valve requires a corresponding boss in the device for the positioning part 112 to be inserted, thus achieving positioning between the waterproof and breathable valve and the device.

[0043] Appendix Figures 7 to 9 A modified example of the waterproof and breathable valve of this invention is shown, with reference to the attached... Figures 1 to 6 Unlike the waterproof and breathable valve shown, the attached... Figures 7 to 9 In this specific example of the waterproof and breathable valve of the present invention, the waterproof and breathable valve includes a pressure ring 60 with an annular channel 61. After the valve core assembly 20 is installed in the valve cavity 101 of the valve body 10, the pressure ring 60 is stacked on the edge portion of the second waterproof and breathable membrane 22. The core hole 231 of the core 23 is connected to the pressure ring channel 61 of the pressure ring 60 through the second waterproof and breathable membrane 22. The valve cap 30 is installed on the valve body 10 and presses down on the pressure ring 60. The waterproof and breathable valve forms a third air passage 70 between the valve cap 30 and the pressure ring 60. The annular channel 61 of the pressure ring 60, the third air passage 70, the first air passage 40, and the second air passage 50 are connected in sequence.

[0044] Since the third air passage 70 is formed between the valve cap 30 and the pressure ring 60, the lower surface of the pressure ring 60 (i.e., the surface of the pressure ring 60 that contacts the edge portion of the second waterproof and breathable membrane 22) can be a complete surface, so that the edge portion of the second waterproof and breathable membrane 22 is subjected to uniform force and avoids the problem of excessive local stress.

[0045] In the appendix Figures 7 to 9 In this specific example of the waterproof and breathable valve of the present invention shown, the pressure block 32 of the valve cap 30 presses down on the pressure ring 60, and the third air passage 70 is formed between the pressure block 32 and the pressure ring 60 of the valve cap 30.

[0046] Specifically, the pressure block 32 of the valve cap 30 has at least one venting notch 321. After the pressure block 32 of the valve cap 30 presses down on the pressure ring 60, the venting notch 321 of the pressure block 32 forms the third air passage 70 between the pressure block 32 and the pressure ring 60. Optionally, in other examples of the waterproof and breathable valve of this utility model, the venting notch 321 may also be provided on the pressure ring 60, so that after the pressure block 32 of the valve cap 30 presses down on the pressure ring 60, the venting notch 321 of the pressure ring 60 forms the third air passage 70 between the pressure block 32 and the pressure ring 60.

[0047] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A waterproof and breathable valve, characterized in that, include: A valve body, wherein the valve body has a valve cavity with an opening at the top and a valve port extending from the valve cavity to the bottom; A valve core assembly, wherein the valve core assembly includes a core body, a first waterproof and breathable membrane, and a second waterproof and breathable membrane, the core body having a core hole, the first waterproof and breathable membrane and the second waterproof and breathable membrane being respectively disposed at opposite ends of the core body to close the two openings of the core hole, wherein the valve core assembly is installed in the valve cavity of the valve body, and the core hole of the core body communicates with the valve hole of the valve body through the first waterproof and breathable membrane; and A valve cap is installed on the valve body in such a way that it presses against the second waterproof and breathable membrane. The waterproof and breathable valve forms a first air passage between the valve cap and the core, and a second air passage between the valve cap and the valve body. The core hole of the core is connected to the inner end of the first air passage through the second waterproof and breathable membrane, and the outer end of the first air passage is connected to the second air passage.

2. The waterproof and breathable valve according to claim 1, wherein the valve body includes a main body portion and an assembly ring extending upward from the main body portion, the valve body forms the valve cavity between the main body portion and the assembly ring, the valve hole is formed in the main body portion, wherein the valve cap includes a top cover, a pressing block extending downward from the center of the top cover and a peripheral wall extending downward from the edge of the top cover, wherein the peripheral wall of the valve cap is installed on the assembly ring of the valve body, a second air passage is formed between the peripheral wall and the assembly ring, a first air passage is formed between the top cover and the core, and the pressing block presses down on the second waterproof and breathable membrane.

3. The waterproof and breathable valve according to claim 2, wherein the assembly ring of the valve body has at least one top notch and at least one side notch, the top notch and the side notch of the assembly ring forming a second air passage between the valve cap and the valve body, wherein, from a side view, the peripheral wall covers the top notch of the assembly ring.

4. The waterproof and breathable valve according to claim 2, wherein the core has a core groove, the second waterproof and breathable membrane is located in the core groove of the core, the outer diameter of the pressure block of the valve cap is smaller than the inner diameter of the core groove of the core, and the sum of the height of the pressure block and the thickness of the edge of the second waterproof and breathable membrane is greater than the depth of the core groove of the core.

5. The waterproof and breathable valve according to claim 2, wherein the assembly ring of the valve body has a supporting step, the core has an overlapping step, and the overlapping step of the core is overlapping the supporting step of the assembly ring.

6. The waterproof and breathable valve according to claim 2, wherein the assembly ring of the valve body has an annular groove, and the inner wall of the peripheral wall of the valve cap is provided with a set of buckling protrusions, the buckling protrusions protruding into the annular groove of the assembly ring.

7. The waterproof and breathable valve according to any one of claims 2 to 6, wherein the main body portion of the valve body has at least one positioning portion, the positioning portion being a boss or a groove.

8. A waterproof and breathable valve, characterized in that, include: A pressure ring, wherein the pressure ring has an annular channel; A valve body, wherein the valve body has a valve cavity with an opening at the top and a valve port extending from the valve cavity to the bottom; A valve core assembly, wherein the valve core assembly includes a core body, a first waterproof and breathable membrane, and a second waterproof and breathable membrane. The core body has a core hole. The first and second waterproof and breathable membranes are respectively disposed at opposite ends of the core body to close the two openings of the core hole. The valve core assembly is installed in the valve cavity of the valve body. The core hole of the core body communicates with the valve hole of the valve body through the first waterproof and breathable membrane. A pressure ring is stacked on the edge portion of the second waterproof and breathable membrane. The core hole of the core body communicates with the annular channel of the pressure ring through the second waterproof and breathable membrane. A valve cap is installed on the valve body in such a way as to press against the pressure ring. The waterproof and breathable valve forms a first air passage between the valve cap and the core, a second air passage between the valve cap and the valve body, and a third air passage between the valve cap and the pressure ring. The ring body channel of the pressure ring, the third air passage, the first air passage and the second air passage are connected in sequence.

9. The waterproof and breathable valve according to claim 8, wherein the valve body includes a main body portion and an assembly ring extending upward from the main body portion, the valve body forming the valve cavity between the main body portion and the assembly ring, the valve hole being formed in the main body portion, wherein the valve cap includes a top cover, a pressing block extending downward from the center of the top cover, and a peripheral wall extending downward from the edge of the top cover, wherein the peripheral wall of the valve cap is mounted on the assembly ring of the valve body, a second air passage is formed between the peripheral wall and the assembly ring, a first air passage is formed between the top cover and the core, the pressing block pressing the pressing ring, and a third air passage being formed between the pressing block and the pressing ring.

10. The waterproof and breathable valve according to claim 9, wherein the pressure block of the valve cap has at least one breathable notch, the breathable notch forming the third air passage between the pressure block and the pressure ring; or the pressure ring has at least one breathable notch, the breathable notch forming the third air passage between the pressure block and the pressure ring.

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