Breathing valve

Abstract

The utility model discloses a breather valve which comprises a valve seat and a valve shell connected with the valve seat, a first vent hole communicated with an inner cavity of the valve shell is formed in the valve seat, a second vent hole is formed in the side portion of the valve shell, a valve element corresponding to the first vent hole is arranged in the valve shell, and the valve element comprises an element cover, a positive pressure valve seat, a negative pressure valve disc, a first spring and a second spring. The core cover is fixedly installed on the upper portion of the positive pressure valve seat, a guide hole and an air inlet hole are formed in the middle of the core cover, the negative pressure valve disc comprises a sealing plate and a guide rod, the sealing plate is located in the positive pressure valve seat, the guide rod is inserted into the guide hole in a sliding mode, the first spring is arranged between the sealing plate and the bottom wall of the positive pressure valve seat, and the second spring is arranged between the core cover and the top wall of the valve shell. A third vent hole communicated with the positive pressure valve seat inner cavity is formed in the position, corresponding to the first vent hole, of the positive pressure valve seat bottom plate. The positive pressure valve and the negative pressure valve are combined together, the structure of the breather valve is simplified, the size is small, the occupied space is small, and installation and use in a limited space are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of breathing valve technology. Background Technology

[0002] A breather valve is a valve that ensures the storage tank is isolated from the atmosphere within a certain pressure range, while also allowing it to breathe when the pressure exceeds or falls below this range. When the pressure of the medium inside the tank is within the breather valve's control operating pressure range, the breather valve does not operate, maintaining the tank's airtightness. When the pressure inside the tank rises and reaches the positive operating pressure of the breather valve, the positive pressure valve opens, allowing gas to escape from the breather valve's outlet, preventing the pressure inside the tank from further increasing. When the pressure inside the tank drops and reaches the negative operating pressure of the breather valve, the outside atmosphere opens the negative pressure valve, allowing outside gas to enter the tank, preventing the pressure inside the tank from further decreasing and maintaining a pressure balance between the inside and outside of the tank.

[0003] In existing breathing valve technology solutions, the positive pressure valve and the negative pressure valve are usually designed separately and work independently. The separate design of the positive pressure valve and the negative pressure valve has the following disadvantages: (1) They each need to occupy a certain amount of space, which makes the overall breathing valve larger and not conducive to installation and use in a limited space; (2) It leads to a relatively complex structure of the entire breathing valve with many parts, which not only increases the manufacturing cost, but also brings difficulties to maintenance and repair. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a breathing valve that combines a positive pressure valve and a negative pressure valve, simplifying the structure and saving space.

[0005] The technical solution adopted by this utility model is as follows: A breathing valve includes a valve seat and a valve shell disposed above the valve seat and connected to the valve seat. A first vent hole communicating with the inner cavity of the valve shell is provided on the valve seat. A second vent hole communicating with the inner cavity of the valve shell is provided on the side of the valve shell. A valve core is disposed inside the valve shell corresponding to the first vent hole. A gap is provided between the valve core and the inner wall of the valve shell. The valve core includes a core cover, a positive pressure valve seat, a negative pressure valve disc, a first spring, and a second spring. The core cover is fixedly installed on the upper part of the positive pressure valve seat, and a vent hole communicating with the inner cavity of the positive pressure valve seat is provided in the middle of the core cover. The negative pressure valve disc includes a sealing plate and a guide rod connected to the sealing plate. The sealing plate is located inside the positive pressure valve seat, and the guide rod is slidably inserted into the guide hole. The first spring is disposed between the sealing plate and the bottom wall of the positive pressure valve seat to press the sealing plate against the core cover and block the air inlet. The second spring is disposed between the core cover and the top wall of the valve body to press the positive pressure valve seat against the valve seat and block the first vent hole. A third vent hole is provided on the bottom plate of the positive pressure valve seat corresponding to the first vent hole, which communicates with the inner cavity of the positive pressure valve seat.

[0006] Furthermore, an annular support plate is fixedly installed inside the valve body, and a through hole or through groove is provided on the annular support plate. A guide sleeve is fixedly installed on the inner ring of the annular support plate, and the positive pressure valve seat is slidably disposed in the guide sleeve.

[0007] Furthermore, a self-lubricating graphite copper sleeve is provided inside the guide sleeve and guide hole.

[0008] Furthermore, sealing rings are provided on the sealing surface where the positive pressure valve seat contacts the valve seat and on the sealing surface where the sealing plate contacts the core cover.

[0009] Furthermore, a valve cover is fixedly installed on the top of the valve body by bolts, and the upper end of the second spring abuts against the inner bottom surface of the valve cover.

[0010] Furthermore, the valve cover and valve body are connected by an adjustable bolt to change the degree of compression of the second spring by the valve cover.

[0011] The beneficial effects of this utility model are as follows: By combining the positive pressure valve and the negative pressure valve, the structure of the breather valve is greatly simplified. The breather valve is smaller in size and occupies less space, which is conducive to installation and use in limited space, and reduces manufacturing costs. It also facilitates maintenance and repair. Since the positive pressure valve and the negative pressure valve are combined, the switching between them is faster, which improves the breather valve's response speed to pressure changes and enables it to better maintain the stability of internal pressure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the breather valve of this utility model in the closed state.

[0013] Figure 2 This is a schematic diagram of the valve core of the breathing valve of this utility model.

[0014] Figure 3 This is a schematic diagram of the valve seat and valve body of the breather valve of this utility model.

[0015] Figure 4 This is a schematic diagram of the annular support plate of the breathing valve of this utility model.

[0016] Figure 5 This is a schematic diagram of the breathing valve of this utility model in the positive pressure valve seat open state.

[0017] Figure 6 This is a schematic diagram of the breathing valve of this utility model in the negative pressure valve disc open state. Detailed Implementation

[0018] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0019] like Figures 1-6 As shown, a breathing valve of this embodiment includes a valve seat 1 and a valve housing 2 disposed above the valve seat 1 and connected to the valve seat 1. The valve seat 1 is fixedly installed on a storage tank and communicates with the inner cavity of the storage tank. A first vent hole 101 communicating with the inner cavity of the valve housing 2 is provided on the valve seat 1. A second vent hole 201 communicating with the inner cavity of the valve housing 2 is provided on the side of the valve housing 2. A valve core 4 is provided inside the valve housing 2 corresponding to the first vent hole 101. A gap is provided between the valve core 4 and the inner wall of the valve housing 2, through which gas flow is allowed. The valve core 4 includes a core cover 404, a positive pressure valve seat 401, a negative pressure valve disc 403, a first spring 402, and a second spring 405. The core cover 404 is fixedly installed on the upper part of the positive pressure valve seat 401. A guide hole and an air inlet 4041 communicating with the inner cavity of the positive pressure valve seat 401 are provided in the middle of the core cover 404. Multiple air inlets 4041 can be arranged around the guide hole. The negative pressure valve disc 403 includes a sealing plate 4031 and a guide rod 4032 connected to the sealing plate 4031. The sealing plate 4031 is located inside the positive pressure valve seat 401, and the guide rod 4032 is slidably inserted into the guide hole. A first spring 402 is disposed between the sealing plate 4031 and the bottom wall of the positive pressure valve seat 401, and is used to press the sealing plate 4031 against the core cover 404 and block the air inlet 4041. A second spring 405 is disposed between the core cover 404 and the top wall of the valve body 2, and is used to press the positive pressure valve seat 401 against the valve seat 1 and block the first vent hole 101. A third vent hole 4011, corresponding to the first vent hole 101, is provided on the bottom plate of the positive pressure valve seat 401, communicating with the inner cavity of the positive pressure valve seat 401.

[0020] When the internal pressure of the storage tank increases, the positive pressure valve seat 401 is pushed open and the second spring 405 is compressed, allowing gas to be discharged through the first vent 101 and the gap between the valve core 4 and the valve housing 2 from the second vent 201. When the internal pressure of the storage tank decreases, the negative pressure valve disc 403 is drawn up and the first spring 402 is compressed, allowing external gas to enter through the air inlet 4041. The first spring 402 and the second spring 405 are used to restore the sealing state of the valve core after the positive and negative pressures disappear.

[0021] In this embodiment, to guide the movement of the positive pressure valve seat 401, an annular support plate 6 is fixedly installed inside the valve housing 2. The annular support plate 6 has a through hole or groove 601 that extends vertically, allowing gas to pass through. A guide sleeve 7 is fixedly installed on the inner ring of the annular support plate 6, and the positive pressure valve seat 401 is slidably disposed within the guide sleeve 7. To reduce friction and wear, a self-lubricating graphite copper sleeve can be installed in the guide sleeve 7 and the guide hole.

[0022] To improve sealing performance, sealing rings are provided on the sealing surfaces of the positive pressure valve seat 401 and valve seat 1, and on the sealing surfaces of the sealing plate 4031 and core cover 404.

[0023] To facilitate the installation of internal components, a valve cover 3 is fixedly installed on the top of the valve housing 2 by bolts, and the upper end of the second spring 405 abuts against the inner bottom surface of the valve cover 3.

[0024] To facilitate adjustment of the working pressure range, the valve cover 3 and the valve body 2 are connected by an adjustable bolt, which is used to change the degree of compression of the second spring 405 by the valve cover 3.

[0025] With the aid of the teachings present in the foregoing description and related drawings, those skilled in the art will conceive of many modifications and other embodiments of the present invention. Therefore, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and modifications and other embodiments are considered to be included within the scope of the appended claims. Although specific terms are used herein, they are used in a general and descriptive sense only and are not intended to be limiting.

Claims

1. A breathing valve, comprising a valve seat (1) and a valve housing (2) disposed above the valve seat (1) and connected to the valve seat (1), wherein the valve seat (1) is provided with a first vent (101) communicating with the inner cavity of the valve housing (2), characterized in that: A second vent hole (201) communicating with the inner cavity of the valve housing (2) is provided on the side of the valve housing (2). A valve core (4) is provided inside the valve housing (2) corresponding to the first vent hole (101). A gap is provided between the valve core (4) and the inner wall of the valve housing (2). The valve core (4) includes a core cover (404), a positive pressure valve seat (401), a negative pressure valve disc (403), a first spring (402), and a second spring (405). The core cover (404) is fixedly installed on the upper part of the positive pressure valve seat (401). A guide hole and an air inlet hole (4041) communicating with the inner cavity of the positive pressure valve seat (401) are provided in the middle of the core cover (404). The negative pressure valve disc (403) includes a sealing plate (4031) and a guide connected to the sealing plate (4031). The rod (4032) and the sealing plate (4031) are located inside the positive pressure valve seat (401). The guide rod (4032) is slidably inserted into the guide hole. The first spring (402) is set between the sealing plate (4031) and the bottom wall of the positive pressure valve seat (401) to press the sealing plate (4031) against the core cover (404) and block the air inlet (4041). The second spring (405) is set between the core cover (404) and the top wall of the valve body (2) to press the positive pressure valve seat (401) against the valve seat (1) and block the first vent hole (101). A third vent hole (4011) is provided on the bottom plate of the positive pressure valve seat (401) corresponding to the first vent hole (101) to communicate with the inner cavity of the positive pressure valve seat (401).

2. A breathing valve as described in claim 1, characterized in that: An annular support plate (6) is fixedly installed inside the valve housing (2). A through hole or through groove (601) is provided on the annular support plate (6). A guide sleeve (7) is fixedly installed on the inner ring of the annular support plate (6). The positive pressure valve seat (401) is slidably disposed inside the guide sleeve (7).

3. A breathing valve as described in claim 2, characterized in that: A self-lubricating graphite copper sleeve is provided in the guide sleeve (7) and the guide hole.

4. A breathing valve as described in claim 1, characterized in that: A sealing ring is provided on the sealing surface where the positive pressure valve seat (401) contacts the valve seat (1) and on the sealing surface where the sealing plate (4031) contacts the core cover (404).

5. A breathing valve as described in claim 1, characterized in that: A valve cover (3) is fixedly installed on the top of the valve housing (2) by bolts, and the upper end of the second spring (405) abuts against the inner bottom surface of the valve cover (3).

6. A breathing valve as described in claim 5, characterized in that: The valve cover (3) and the valve body (2) are connected by an adjustable bolt, which is used to change the degree of compression of the valve cover (3) on the second spring (405).

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