Waterproof valve

Abstract

A waterproof valve includes a housing, a valve assembly mounted in the housing, and a pivot shaft cooperating with the valve assembly. The pivot shaft is configured to be capable of driving the valve assembly to rotate in the shell. The shell comprises an inner cavity and a base platform part protruding towards the inner cavity, and the base platform part is provided with a conical abutting face. The valve assembly is installed in the inner cavity. The valve assembly comprises a mounting base and a metal sheet fixed to the mounting base. The metal sheet comprises a fixed part fixed to the mounting base and a folding part protruding out of the fixed part in the radial direction of the shell. The folding part is provided with a sealing face, and the sealing face is configured to be in elastic abutting sealing with the abutting face so as to separate the first space from the second space when the valve assembly is located at the closing position.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waterproof valve belongs to engine exhaust system technical field. BACKGROUND

[0002] With the continuous development of automobiles, in some extreme cases, vehicles need to wade. When the vehicle wades, water will enter the interior through the exhaust system of the vehicle, which can easily cause damage to related parts.

[0003] As a kind of part that can prevent water from entering the vehicle interior through exhaust system, waterproof valve is more and more valued.

[0004] However, the waterproof valve in the exhaust system needs to be able to withstand high temperature, and needs to be able to reliably close the exhaust system when the vehicle wades to prevent water from flowing in. The waterproof valve in the related art still has room for improvement. SUMMARY

[0005] The utility model aims at providing a waterproof valve with improved structure.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a waterproof valve, comprising a housing, a valve assembly installed in the housing, and a pivot shaft cooperating with the valve assembly; the pivot shaft is arranged non-eccentrically compared to the housing, and is configured to drive the valve assembly to rotate in the housing; the housing includes an inner cavity and a base portion protruding into the inner cavity, the base portion is provided with a tapered abutting surface, and the inner cavity includes a first space on one side of the valve assembly and a second space on the other side of the valve assembly; the valve assembly is installed in the inner cavity, and the valve assembly includes a mounting base and a metal sheet fixed to the mounting base, the mounting base is fixed to the pivot shaft, the metal sheet includes a fixed portion fixed to the mounting base and a folded portion protruding from the fixed portion along the radial direction of the housing, the folded portion is provided with a sealing surface, and the sealing surface is configured to elastically abut and seal with the abutting surface to separate the first space from the second space when the valve assembly is in the closed position.

[0007] As a further improved technical scheme of the utility model, the mounting base is provided with a mounting portion and a protruding portion protruding from the mounting portion along the axial direction of the housing, the protruding portion is provided with a mounting hole through which the pivot shaft passes, and the protruding portion is fixed to the pivot shaft.

[0008] As a further improved technical scheme of the utility model, the convex part includes a first convex part and a second convex part, the first convex part is provided with a first mounting hole penetrating through the first convex part along the radial direction of the shell, the second convex part is provided with a second mounting hole penetrating through the second convex part along the radial direction of the shell, and the mounting hole includes the first mounting hole and the second mounting hole.

[0009] As a further improved technical scheme of the utility model, the first convex part is provided with a first fixing hole perpendicular to the first mounting hole, and the pivot shaft is provided with a first matching hole aligned with the first fixing hole.

[0010] The second convex part is provided with a second fixing hole perpendicular to the second mounting hole, and the pivot shaft is provided with a second matching hole aligned with the second fixing hole.

[0011] The valve assembly includes a first fastener and a second fastener, wherein the first fastener is matched with the first fixing hole and the first matching hole to fix the pivot shaft and the first convex part together, and the second fastener is matched with the second fixing hole and the second matching hole to fix the pivot shaft and the second convex part together.

[0012] As a further improved technical scheme of the utility model, the metal sheet is provided with an annular notch located at the inner side of the folded part, the folded part is exposed in the annular notch, and the folded part is configured to be elastically deformed into the annular notch.

[0013] As a further improved technical scheme of the utility model, the annular notch is located at the periphery of the mounting base.

[0014] As a further improved technical scheme of the utility model, the valve assembly further includes a pressing plate, and the metal sheet is clamped between the mounting base and the pressing plate.

[0015] As a further improved technical scheme of the utility model, the valve assembly further includes a fastening element for fixing the pressing plate, the metal sheet and the mounting base together.

[0016] As a further improved technical scheme of the utility model, the pressing plate is provided with a first perforation, the metal sheet is provided with a second perforation, and the fastening element penetrates through the first perforation and the second perforation.

[0017] As a further improved technical scheme of the utility model, the shell is provided with a first mounting seat and a second mounting seat protruding along the radial direction of the shell, the protruding directions of the first mounting seat and the second mounting seat are opposite, the first mounting seat is provided with a first mounting space, and the second mounting seat is provided with a second mounting space.

[0018] The waterproof valve includes a first bushing housed in the first installation space and a second bushing housed in the second installation space. The first bushing has a first central hole, and the second bushing has a second central hole. The pivot shaft passes through the first central hole and the second central hole.

[0019] As a further improvement of the present invention, the waterproof valve is further provided with a cover fixed to the second mounting seat to cover the second bushing.

[0020] As a further improvement of the present invention, the first mounting base is provided with a limiting protrusion, and the waterproof valve includes a driving part fixed to one end of the pivot shaft. The driving part is provided with a limiting surface that cooperates with the limiting protrusion. The driving part is configured to cooperate directly or indirectly with a driving device. The driving device is used to drive the driving part and drive the pivot shaft to rotate together.

[0021] As a further improvement of this utility model, the base portion is provided with a conical hole, and the contact surface is a conical surface and is exposed in the conical hole.

[0022] As a further improvement of this utility model, the central axis of the conical hole overlaps with the central axis of the inner cavity.

[0023] As a further improvement of the present invention, the folding portion includes an oblique portion extending radially outward from the outer edge of the fixing portion along the inner cavity and simultaneously extending away from the fixing portion along the central axis of the inner cavity; a bend extending radially outward from the outer edge of the oblique portion along the inner cavity and simultaneously extending towards the fixing portion along the central axis of the inner cavity; and a sealing portion extending radially outward from the outer edge of the bend extending radially outward from the inner cavity and simultaneously extending obliquely away from the bend along the central axis of the inner cavity, wherein the sealing surface is the outer surface of the sealing portion.

[0024] As a further improvement of this utility model, the sealing surface is an arc-shaped surface, and the arc-shaped surface and the contact surface are in narrow-surface contact.

[0025] As a further improvement of this utility model, the sealing surface is a spherical surface, and the spherical surface and the contact surface are in narrow-surface contact.

[0026] As a further improvement of the present invention, the folding portion includes an inclined guide portion that extends radially inward from the outer edge of the sealing portion along the inner cavity and simultaneously extends obliquely away from the turning bend along the central axis of the inner cavity.

[0027] As a further improvement of this utility model, the inclined guide part is located at the free end of the folding part, and the inclined guide part is used to guide the folding part to cooperate with the abutting surface when the folding part rotates.

[0028] Compared to existing technologies, the valve assembly of this invention comprises a housing including an inner cavity and a base portion protruding into the inner cavity, the base portion having a conical abutment surface; the folded portion has a sealing surface, the sealing surface being configured to elastically abut and seal with the abutment surface to isolate the first space from the second space when the valve assembly is in the closed position. This invention improves sealing performance by providing the metal plate and achieving sealing through the folded portion. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of the waterproof valve of this utility model in one embodiment;

[0030] Figure 2 yes Figure 1 3D exploded view;

[0031] Figure 3 yes Figure 2 Exploded 3D view of the valve assembly;

[0032] Figure 4 yes Figure 1 The right view;

[0033] Figure 5 yes Figure 1 Top view;

[0034] Figure 6 yes Figure 1 Rear view;

[0035] Figure 7 yes Figure 1 The main view;

[0036] Figure 8 It is along Figure 5 Schematic diagram of the cross section of line AA;

[0037] Figure 9 yes Figure 8 A magnified view of part B circled in the middle;

[0038] Figure 10 yes Figure 8 A magnified view of part C circled in the middle. Detailed Implementation

[0039] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments can be combined with each other without conflict. When the description relates to the drawings, unless otherwise stated, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary embodiments does not represent all embodiments of this utility model; rather, they are merely examples of products consistent with this utility model and as described in the claims.

[0040] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the scope of protection of this invention. It should be understood that terms such as "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish the features.

[0041] Please refer to Figures 1 to 10 As shown, this utility model discloses a waterproof valve 100, which is applied in an exhaust system. The waterproof valve 100 includes a housing 1, a valve assembly 2 installed in the housing 1, and a pivot shaft 3 that cooperates with the valve assembly 2. The pivot shaft 3 is configured to drive the valve assembly 2 to rotate between an open position and a closed position within the housing 1.

[0042] In one embodiment of this utility model, the housing 1 is a metal housing, which includes an inner cavity 10. The inner cavity 10 includes a first space 101 located on one side (e.g., the left side) of the valve assembly 2 and a second space 102 located on the other side (e.g., the right side) of the valve assembly 2. Those skilled in the art will understand that the term "open position" means that the first space 101 and the second space 102 are connected; the term "closed position" means that the first space 101 and the second space 102 are almost not connected or not connected at all.

[0043] The valve assembly 2 is installed in the inner cavity 10. The valve assembly 2 includes a mounting base 21, a metal plate 22 fixed to the mounting base 21, and a pressure plate 23. The mounting base 21 has a mounting portion 211 and a protrusion 212 protruding from the mounting portion 211 along the axial direction of the housing 1. The protrusion 212 is fixed to the pivot shaft 3. The mounting portion 211 is located on one side (e.g., the right side) of the pivot shaft 3 along the axial direction of the housing 1. The protrusion 212 has a mounting hole 2120 through which the pivot shaft 3 passes.

[0044] In the embodiment illustrated in this utility model, the protrusion 212 includes a first protrusion 2121 and a second protrusion 2122. The first protrusion 2121 is provided with a first mounting hole 2121a that penetrates the first protrusion 2121 radially along the housing 1 and a first fixing hole 2121b that is perpendicular to the first mounting hole 2121a.

[0045] The second protrusion 2122 is provided with a first mounting hole 2121a that penetrates the second protrusion 2122 radially along the housing 1 and a second fixing hole 2122b that is perpendicular to the second mounting hole 2122a.

[0046] In the embodiment illustrated in this utility model, the mounting portion 211 and the protrusion 212 are integrally formed. The first protrusion 2121 and the second protrusion 2122 are arranged radially spaced along the housing 1. The mounting hole 2120 includes the first mounting hole 2121a and the second mounting hole 2122a.

[0047] The pivot shaft 3 is provided with a first mating hole 31 aligned with the first fixing hole 2121b and a second mating hole 32 aligned with the second fixing hole 2122b. The pivot shaft 3 is also provided with a limiting plate 33 and an end 34 protruding from the limiting plate 33.

[0048] When the pivot shaft 3 is inserted into the first mounting hole 2121a and the second mounting hole 2122a and is fully inserted, the first fixing hole 2121b aligns with the first mating hole 31, and the second fixing hole 2122b aligns with the second mating hole 32. In the embodiment illustrated in this utility model, the valve assembly 2 further includes a first fastener 24 and a second fastener 25. The first fastener 24 engages with the first fixing hole 2121b and the first mating hole 31 to fix the pivot shaft 3 to the first protrusion 2121; the second fastener 25 engages with the second fixing hole 2122b and the second mating hole 32 to fix the pivot shaft 3 to the second protrusion 2122. In one embodiment of this utility model, both the first fastener 24 and the second fastener 25 are screws.

[0049] The metal plate 22 includes a fixing portion 221 fixed to the mounting portion 211, a folded portion 222 protruding radially from the fixing portion 221 along the housing 1, and an annular recess 223 located inside the folded portion 222. The folded portion 222 is configured to elastically abut against the inner wall of the housing 1 to seal against it, thereby separating the first space 101 from the second space 102 when the valve assembly 2 is in the closed position. The folded portion 222 is exposed inwardly in the annular recess 223, and is configured to elastically deform radially into the annular recess 223. In the embodiment illustrated in this utility model, the annular recess 223 is located around the fixing portion 221 so that the elastic deformation of the folded portion 222 is not affected by the fixing portion 221.

[0050] In the embodiment illustrated in this utility model, the metal plate 22 is clamped between the mounting portion 211 and the pressure plate 23. The folding portion 222 is located radially around the mounting base 21 and the pressure plate 23 to prevent the elastic deformation of the folding portion 222 from being affected by the mounting base 21 and the pressure plate 23.

[0051] Specifically, the valve assembly 2 further includes fastening elements 26 that fix the pressure plate 23, the metal plate 22, and the mounting portion 211 together. In one embodiment of this invention, the fastening elements 26 are screws, and there are several of them.

[0052] The pressure plate 23 is provided with a first through hole 230, the metal plate 22 is provided with a second through hole 220, and the fastening element 26 passes through the first through hole 230 and the second through hole 220.

[0053] In the embodiment illustrated in this utility model, the metal plate 22 has a first hollow portion 224 located in the middle of the metal plate 22, which facilitates weight reduction and improves the elastic deformation capability of the folding portion 222. The mounting portion 211 has a second hollow portion 214 corresponding to the first hollow portion 224 in the middle. The middle portion of the pressure plate 23, corresponding to the first hollow portion 224 and the second hollow portion 214, is a solid structure 234 to block water when the valve assembly 2 is in the closed position.

[0054] In the embodiment illustrated in this utility model, the housing 1 further comprises a first mounting seat 11 and a second mounting seat 12 protruding radially along the housing 1, wherein the protrusion directions of the first mounting seat 11 and the second mounting seat 12 are opposite. The first mounting seat 11 is provided with a first mounting space 111, and the second mounting seat 12 is provided with a second mounting space 121.

[0055] The waterproof valve 100 further includes a first bushing 4 housed in the first mounting space 111, a second bushing 5 housed in the second mounting space 121, a cover 6 that covers the second bushing 5, and a drive unit 7 fixed to one end of the pivot shaft 3. In the embodiment illustrated in this utility model, the cover 6 is welded and fixed to the second mounting base 12 and is located inside the second mounting base 12.

[0056] The first bushing 4 has a first central hole 41, and the second bushing 5 has a second central hole 51. The pivot shaft 3 passes through the first central hole 41 and the second central hole 51. The limiting plate 33 of the pivot shaft 3 abuts against the first bushing 4 to achieve limiting. The driving part 7 is welded and fixed to the end 34 of the pivot shaft 3. In the embodiment illustrated in this utility model, the first mounting base 11 has a limiting protrusion 112, and the driving part 7 has a limiting surface 71 that cooperates with the limiting protrusion 112. The driving part 7 is configured to cooperate directly or indirectly with a driving device (not shown). The driving device is used to drive the driving part 7 and drive the pivot shaft 3 to rotate together, so that the valve assembly 2 can rotate between the open position and the closed position.

[0057] Please combine Figure 7 As shown in the illustrated embodiment of this utility model, the center line NN of the pivot shaft 3 overlaps with the center line PP of the metal plate 22, and the center line NN of the pivot shaft 3 is located at the center of the cross-section of the housing 1. In other words, the pivot shaft 3 is not eccentrically positioned relative to the housing 1. With this configuration, the pivot shaft 3 of this utility model is advantageous for driving the valve assembly 2 to open or close during rotation.

[0058] Please combine Figures 8 to 10As shown in the illustrated embodiment of this utility model, the housing 1 has a base portion 13 protruding into the inner cavity 10. The base portion 13 has an abutment surface 131 exposed in the inner cavity 10, and the abutment surface 131 is an inclined surface extending axially along the housing 1. In the illustrated embodiment of this utility model, the base portion 13 has a conical hole 132, and the abutment surface 131 is a conical surface exposed in the conical hole 132. In other words, the abutment surface 131 is the inner surface left after the conical hole 132 is formed. In the illustrated embodiment of this utility model, the central axis MM of the conical hole 132 overlaps with the central axis OO of the inner cavity 10. Those skilled in the art will understand that this conical hole 132 of this utility model has an axisymmetric structure, which facilitates processing and manufacturing, and thus can better ensure that the various parameters of the abutment surface 131 meet the requirements. The folded portion 222 elastically abuts and seals with the abutment surface 131. By providing the contact surface 131, it is beneficial to realize the rotation of the folding part 222.

[0059] Specifically, in the embodiment illustrated in this utility model, the folding portion 222 includes an oblique portion 2221 extending radially outward from the outer edge of the fixing portion 221 along the inner cavity 10 and simultaneously extending away from the fixing portion 221 along the central axis OO of the inner cavity 10; a bend portion 2222 extending radially outward from the outer edge of the oblique portion 2221 along the inner cavity 10 and simultaneously extending close to the fixing portion 221 along the central axis OO of the inner cavity 10; a sealing portion 2223 extending radially outward from the outer edge of the bend portion 2222 along the inner cavity 10 and simultaneously extending obliquely away from the bend portion 2222 along the central axis OO of the inner cavity 10; and an inclined guide portion 2224 extending radially inward from the outer edge of the sealing portion 2223 along the inner cavity 10 and simultaneously extending obliquely away from the bend portion 2222 along the central axis OO of the inner cavity 10. The deflecting portion 2221 deviates outward from the fixed portion 221 along the central axis OO of the inner cavity 10. The sealing portion 2223 has a tapered sealing surface 2223a on its outer surface. When the valve assembly 2 is in the closed position, the sealing surface 2223a is configured to elastically abut against the contact surface 131 for sealing. The tilting guide portion 2224 is located at the free end of the folding portion 222. The tilting guide portion 2224 is used to guide the folding portion 222 to engage with the contact surface 131 when the folding portion 222 rotates.

[0060] In one embodiment of this utility model, the sealing surface 2223a is an arc-shaped surface, and the arc-shaped surface contacts the abutting surface 131 in a narrow surface manner to reduce the friction between the valve assembly 2 and the abutting surface 131 when rotating, thereby helping to increase the rotation speed of the valve assembly 2 and reduce the rotation torque.

[0061] Preferably, the sealing surface 2223a is spherical, and the spherical surface makes narrow-surface contact with the abutment surface 131 to reduce the friction between the valve assembly 2 and the abutment surface 131 during rotation, thereby improving the rotational speed of the valve assembly 2 and reducing the rotational torque. When the sealing surface 2223a is spherical, theoretically, the valve assembly 2 makes line contact with the abutment surface 131 during rotation. The relatively small contact area of ​​the line contact facilitates the rotation of the valve assembly 2 and maintains the sealing between the valve assembly 2 and the abutment surface 131 when the valve assembly 2 is in the closed position.

[0062] Those skilled in the art will understand that the technical term "narrow surface contact" used in this invention refers to minimizing the contact area between the valve assembly 2 and the abutment surface 131, thereby reducing the friction between them and facilitating the rotation of the valve assembly 2. Furthermore, "narrow surface contact" also improves the sealing performance between the valve assembly 2 and the abutment surface 131 when the valve assembly 2 is in the closed position.

[0063] Compared to existing technologies, the valve assembly 2 of this invention includes a mounting base 21 and a metal plate 22 fixed to the mounting base 21. The mounting portion 211 is located on one side of the pivot shaft 3 along the axial direction of the housing 1. The folding portion 222 is configured to elastically abut against the inner wall of the housing 1 to seal, thereby separating the first space 101 from the second space 102 when the valve assembly 2 is in the closed position. This invention improves sealing performance by providing the metal plate 22 and achieving sealing through the folding portion 222.

[0064] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A waterproof valve, characterized in that, The device includes a housing, a valve assembly mounted in the housing, and a pivot shaft cooperating with the valve assembly. The pivot shaft is non-eccentric relative to the housing and is configured to drive the valve assembly to rotate within the housing. The housing includes an inner cavity and a base portion protruding into the inner cavity. The base portion has a conical abutment surface. The inner cavity includes a first space located on one side of the valve assembly and a second space located on the other side of the valve assembly. The valve assembly is mounted in the inner cavity and includes a mounting base and a metal plate fixed to the mounting base. The mounting base is fixed to the pivot shaft. The metal plate includes a fixing portion fixed to the mounting base and a folded portion protruding radially from the fixing portion of the housing. The folded portion has a sealing surface configured to elastically abut against the abutment surface to seal and isolate the first space from the second space when the valve assembly is in a closed position.

2. The waterproof valve as described in claim 1, characterized in that: The mounting base has a mounting portion and a protrusion that protrudes from the mounting portion along the axial direction of the housing. The protrusion has a mounting hole through which the pivot shaft passes, and the protrusion is fixed to the pivot shaft.

3. The waterproof valve as described in claim 2, characterized in that: The protrusion includes a first protrusion and a second protrusion. The first protrusion has a first mounting hole that penetrates the first protrusion radially along the housing. The second protrusion has a second mounting hole that penetrates the second protrusion radially along the housing. The mounting hole includes the first mounting hole and the second mounting hole.

4. The waterproof valve as described in claim 3, characterized in that: The first protrusion is provided with a first fixing hole perpendicular to the first mounting hole, and the pivot shaft is provided with a first mating hole aligned with the first fixing hole; The second protrusion is provided with a second fixing hole perpendicular to the second mounting hole, and the pivot shaft is provided with a second mating hole aligned with the second fixing hole; The valve assembly includes a first fastener and a second fastener, wherein the first fastener engages with the first fixing hole and the first mating hole to fix the pivot shaft to the first protrusion; and the second fastener engages with the second fixing hole and the second mating hole to fix the pivot shaft to the second protrusion.

5. The waterproof valve as described in claim 1, characterized in that: The metal plate has an annular notch located inside the folded portion, the folded portion is exposed inward in the annular notch, and the folded portion is configured to elastically deform into the annular notch.

6. The waterproof valve as described in claim 5, characterized in that: The annular notch is located on the periphery of the mounting base.

7. The waterproof valve as described in claim 1, characterized in that: The valve assembly also includes a pressure plate, and the metal plate is clamped between the mounting base and the pressure plate.

8. The waterproof valve as described in claim 7, characterized in that: The valve assembly also includes fastening elements that secure the pressure plate, the metal plate, and the mounting base together.

9. The waterproof valve as described in claim 8, characterized in that: The pressure plate has a first through hole, the metal plate has a second through hole, and the fastening element passes through the first through hole and the second through hole.

10. The waterproof valve as described in claim 1, characterized in that: The housing is provided with a first mounting seat and a second mounting seat that protrude radially along the housing. The protrusion directions of the first mounting seat and the second mounting seat are opposite. The first mounting seat is provided with a first mounting space, and the second mounting seat is provided with a second mounting space. The waterproof valve includes a first bushing housed in the first installation space and a second bushing housed in the second installation space. The first bushing has a first central hole, and the second bushing has a second central hole. The pivot shaft passes through the first central hole and the second central hole.

11. The waterproof valve as described in claim 10, characterized in that: The waterproof valve is also provided with a cover fixed to the second mounting base to cover the second bushing.

12. The waterproof valve as described in claim 10, characterized in that: The first mounting base is provided with a limiting protrusion. The waterproof valve includes a driving part fixed to one end of the pivot shaft. The driving part is provided with a limiting surface that cooperates with the limiting protrusion. The driving part is configured to cooperate directly or indirectly with a driving device. The driving device is used to drive the driving part and drive the pivot shaft to rotate together.

13. The waterproof valve according to any one of claims 1 to 12, characterized in that: The base portion is provided with a conical hole, and the contact surface is a conical surface and is exposed in the conical hole.

14. The waterproof valve as described in claim 13, characterized in that: The central axis of the conical hole overlaps with the central axis of the inner cavity.

15. The waterproof valve as described in claim 13, characterized in that: The folding portion includes an oblique portion extending radially outward from the outer edge of the fixing portion along the inner cavity and simultaneously extending away from the fixing portion along the central axis of the inner cavity; a bend extending radially outward from the outer edge of the oblique portion along the inner cavity and simultaneously extending closer to the fixing portion along the central axis of the inner cavity; and a sealing portion extending radially outward from the outer edge of the bend extending radially outward from the inner cavity and simultaneously extending obliquely away from the bend along the central axis of the inner cavity, wherein the sealing surface is the outer surface of the sealing portion.

16. The waterproof valve as described in claim 15, characterized in that: The sealing surface is an arc-shaped surface, and the arc-shaped surface and the contact surface are in narrow contact.

17. The waterproof valve as described in claim 15, characterized in that: The sealing surface is spherical, and the spherical surface and the contact surface are in narrow-surface contact.

18. The waterproof valve as described in claim 15, characterized in that: The folding portion includes an inclined guide portion that extends radially inward from the outer edge of the sealing portion along the inner cavity and simultaneously extends obliquely away from the turning bend along the central axis of the inner cavity.

19. The waterproof valve as described in claim 18, characterized in that: The inclined guide portion is located at the free end of the folded portion, and the inclined guide portion is used to guide the folded portion to cooperate with the abutment surface when the folded portion rotates.

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