CN112386823A

CN112386823A - Expiratory valve

Info

Publication number: CN112386823A
Application number: CN202010788391.3A
Authority: CN
Inventors: 王宁助; 廖淑慧
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-14
Filing date: 2020-08-07
Publication date: 2021-02-23
Anticipated expiration: 2040-08-07
Also published as: TWI702973B; TW202106347A; CN112386823B

Abstract

An exhalation valve comprises a housing and a valve flap. The shell is provided with a bottom plate, a front wall which is separated from the bottom plate and is airtight, and a first enclosing wall and a second enclosing wall which are mutually connected into a surrounding shape and are connected with the bottom plate and the front wall. The base plate has a valve port, and a sealing surface surrounding the valve port. The first enclosing wall is airtight and defines a buffer chamber. The second enclosing wall defines a discharge chamber and is provided with at least one exhaust port communicated with the discharge chamber and the outside. The valve clack is provided with a movable part which is far away from the discharge chamber and movably covers the sealing surface, and is suitable for being pushed by airflow to open the valve port, so that the airflow enters the buffer chamber, flows towards the discharge chamber and is discharged out of the outside through the at least one exhaust port. Therefore, the exhalation valve has a longer exhaust path, can reduce the invasion of ambient air from the path and prevent the spray from being sprayed outside.

Description

Expiratory valve

Technical Field

The present invention relates to an exhalation valve, and more particularly, to an exhalation valve that is suitable for a respiratory protection device and allows unidirectional flow of air.

Background

The breathing protection device is commonly called a mask, has the function of filtering outside air to protect the personal respiratory system, but is not easy to wear or cannot endure long-time wearing because a wearer cannot tolerate the retention and accumulation of the exhaled damp, hot and dirty air in the mask. In order to reduce the discomfort caused by wearing a mask, an exhalation valve capable of exhausting a large amount of air quickly is widely used in the mask.

Referring to fig. 1, a conventional one-way exhalation valve 1 disclosed in chinese patent No. CN205672370 mainly comprises a base 11 having a shield-shaped hole 111 formed therein, an upper cover 12 matching with the base 11, and an elastic membrane 13 openably covering the shield-shaped hole 111 and having one end fixed between the base 11 and the upper cover 12. The upper cover 12 has a plurality of bar-shaped through-holes 121 formed at a lower side. Therefore, the elastic film 13 can only be opened in one direction, so that the exhaled air flow can push the elastic film 13 from the mask through the shield-shaped hole 111, the elastic film 13 is opened in the shield-shaped hole 111, and the air flow is allowed to be exhausted outwards quickly and in a large amount through the strip-shaped through hole 121.

However, when the elastic film 13 is opened, the shield-shaped hole 111 is directly connected to the strip-shaped through hole 121, which is equivalent to being directly connected to the outside, so that if a user wearing the mask is a patient with droplet-infected viruses and germs, the viruses and germs will be directly discharged to the outside along with the droplet during exhalation, thereby disabling the protection effect of the mask and causing infection of other people.

What is more, in the process that the elastic film 13 covers the shield-shaped hole 111, the opening of the elastic film 13 is close to the strip-shaped through hole 121, so that after the external air enters from the strip-shaped through hole 121, the external air can pass through the shield-shaped hole 111 only by a very short distance, and at the moment, the dirty or virus and germ-polluted external air can enter the inlet cover through the shield-shaped hole 111, so that the harm to the user is caused.

Disclosure of Invention

The invention aims to provide an exhalation valve which can improve the protection effect.

The invention relates to an exhalation valve, which comprises a shell and a valve clack.

The shell comprises a bottom plate, a front wall which is separated from the bottom plate by a distance and is airtight, and a first enclosing wall and a second enclosing wall which are mutually connected into a surrounding shape and are connected with the bottom plate and the front wall, wherein the bottom plate is provided with a valve port for air flow to enter and a sealing surface surrounding the valve port, the first enclosing wall is airtight and defines a buffer chamber, and the second enclosing wall defines a discharge chamber and is provided with at least one exhaust port communicated with the discharge chamber and the outside.

The valve clack comprises a fixed part fixed on one side of the valve port and adjacent to the discharge chamber, and a movable part which is far away from the discharge chamber and movably covers the sealing surface, wherein the movable part is suitable for being pushed by airflow to open the valve port, so that the airflow flows towards the discharge chamber after entering the buffer chamber and then is discharged outside through the at least one exhaust port.

According to the exhalation valve, the inner surface of the front wall is separated from the bottom plate by a distance which is not less than 12.5 mm.

In the exhalation valve of the present invention, the second enclosing wall has two spaced side walls and an end wall connecting the side walls and the front wall, and at least one of the side walls and the end wall has the at least one exhaust port.

In the exhalation valve of the present invention, the movable portion of the valve flap extends from the position adjacent to the end wall toward the first enclosing wall, and the width in the direction of the side wall is gradually reduced from the fixed portion toward the movable portion.

In the exhalation valve of the invention, the shape of the first enclosing wall is matched with the shape of the movable part of the valve clack.

According to the exhalation valve, when the movable part of the valve clack closes the valve port, a gap is at least separated from the first enclosing wall, and the maximum distance of the gap is not more than 5 mm.

In the exhalation valve of the present invention, the side wall of the second enclosing wall has a plurality of exhaust ports, the exhaust port of each side wall has an edge adjacent to the bottom plate, the edge of the exhaust port of each side wall is spaced from the bottom plate by a variable distance, and the variable distance of the exhaust port of the side wall is gradually reduced from the adjacent first enclosing wall to the far away first enclosing wall.

In the exhalation valve of the invention, the shell is also provided with a fixing part which is pressed on the valve clack and a continuous pressing plane.

In the exhalation valve of the present invention, the housing further includes a pressing portion extending from the inner surface of the front wall toward the bottom plate, the pressing portion has the pressing plane formed at one end, and a through hole penetrating from the end wall toward the first enclosing wall.

In the exhalation valve of the present invention, the bottom plate of the housing further has a support wall surrounding the valve port, the support wall having the sealing surface formed on one end surface, the sealing surface having an arc-shaped recessed portion facing the front wall and recessed toward the middle from both end portions adjacent to the end wall and the first enclosing wall.

The invention has the beneficial effects that: by the special space design of the buffer chamber, the discharge chamber and the valve clack, the exhaust smoothness can be improved, and due to the longer exhaust path, the invasion of dirty or virus and germ polluted external air from the way can be reduced, and spray can not be discharged along with expiration, so that the spray propagation can be prevented, and the protection effect is improved.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is an exploded perspective view illustrating a prior art one-way exhalation valve disclosed in Chinese patent No. CN 205672370;

FIG. 2 is an exploded perspective view illustrating a first embodiment of an exhalation valve of the present invention;

FIG. 3 is an exploded perspective view of the first embodiment from another angle;

FIG. 4 is a combined perspective view of the first embodiment;

FIG. 5 is a cross-sectional view of the first embodiment;

FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a cross-sectional view similar to FIG. 5;

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a side view illustrating a variation of the first embodiment of a housing;

FIG. 10 is an exploded perspective view illustrating a second embodiment of an exhalation valve in accordance with the invention; and

fig. 11 is a combined perspective view of the second embodiment.

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, like elements are represented by like reference numerals.

Referring to fig. 2, 3 and 4, a first embodiment of the exhalation valve of the present invention includes a housing 2 and a flap 3.

The housing 2 includes a bottom plate 21, a front wall 22 spaced from the bottom plate 21 along an axis X and airtight, a first wall 23 and a second wall 24 connected to each other in a surrounding manner and connected to the bottom plate 21 and the front wall 22, and a press-fit portion 25.

The bottom plate 21 has a valve port 211 penetrating in the direction of the axis X and allowing an air flow to enter, and a supporting wall 212 surrounding the valve port 211. The load bearing wall 212 has a sealing surface 213 formed on one end surface. The sealing surface 213 has an arc-shaped recessed portion 214 facing the front wall 22 and recessed toward the center from both end portions adjacent to the first enclosing wall 23 and the second enclosing wall 24.

Referring to fig. 2, 3 and 5, an inner surface of the front wall 22 is spaced apart from the bottom plate 21 by a distance D not less than 12.5mm, so that the valve flap 3 has a large lifting space.

The first wall 23 is gas-tight and defines a buffer chamber 230 with the front wall 22 and the bottom plate 21. In the present embodiment, the first enclosing wall 23 is generally U-shaped.

The second enclosing wall 24 defines a discharge chamber 240 with the front wall 22 and the bottom plate 21, and in this embodiment, the second enclosing wall 24 has two side walls 241 which are separated by a space in the direction perpendicular to the axis X and are generally in a shape of a Chinese character 'ba', and an end wall 242 which connects one end of the two side walls 241, which is separated by a wider space, with the front wall 22. The end of the two side walls 241, which is spaced apart from each other by a narrow distance, is connected to one end of the U-shaped first enclosing wall 23, and each side wall 241 has two exhaust ports 243 respectively communicating with the exhaust chamber 240 and the outside. Each exhaust port 243 has an edge 244 adjacent the base plate 21. The end wall 242 has an exhaust port 245 communicating between the exhaust chamber 240 and the outside. The exhaust port 245 extends to the front wall 22.

The pressing portion 25 extends from the inner surface of the front wall 22 toward the bottom plate 21, and has a pressing plane 251 formed at one end and continuous, and a through hole 252 penetrating from the end wall 242 toward the first enclosing wall 23.

Referring to fig. 5, 6 and 7, the valve flap 3 includes a fixed portion 31 fixed to one side of the valve port 211 and adjacent to the discharge chamber 240, and a movable portion 32 remote from the discharge chamber 240 and movably covering the sealing surface 213. The fixing portion 31 is pressed by the pressing plane 251, and external air is blocked from leaking into the valve port 211 from the direction of the fixing portion 31. The movable portion 32 extends from the adjacent end wall 242 toward the first enclosing wall 23, and the width along the side wall 241 gradually decreases from the fixed portion 31 toward the movable portion 32, and is generally triangular. The shape of the movable portion 32 matches with the shape of the first wall 23, and when the valve port 211 is closed, a gap d is formed between the movable portion and the first wall 23, and the maximum distance of the gap d is not greater than 5 mm.

Referring to fig. 4, the exhalation valve of the present invention is suitable for a respiratory protection device (not shown), and in a use state, the bottom plate 21 faces rearward adjacent to the face, the front wall 22 of the housing 2 faces forward of the face, the first enclosing wall 23 faces upward, the end wall 242 of the second enclosing wall 24 faces downward, and the side walls 241 face to the left and right.

Referring to fig. 5, 6, 7 and 8, when a person exhales through the nose or mouth, the positive pressure generated by the airflow of the exhaled breath in the respiratory protection device (not shown) passes through the valve port 211 of the bottom plate 21 and pushes the movable portion 32 of the valve flap 3, so that the movable portion 32 of the valve flap 3 moves in the buffer chamber 230 in a direction opposite to the valve port 211 to open the valve port 211.

At this time, the movable portion 32 is lifted forward to open the valve port 211, so that the air flow flows toward the first enclosing wall 23 and enters the buffer chamber 230, and when the air-tight first enclosing wall 23 and the front wall 22 are blocked, the air flow will flow between the movable portion 32 and the first enclosing wall 23, because the movable portion 32 of the valve flap 3 is narrow forward and wide backward in the lifted state, and when the lifting is larger, that is, the valve flap 3 is lifted forward and larger, the gap between the narrow forward portion of the movable portion 32 and the first enclosing wall 23 is enlarged near the fixed portion 31, so that the air flow flows toward the discharge chamber 240 quickly, and then is exhausted through the

exhaust ports

243 and 245. Therefore, the exhaled spray is blocked by the first enclosing wall 23 and the front wall 22 and cannot be directly discharged with the airflow. In the present embodiment, as shown in fig. 2 and fig. 3, the air outlet 243 is disposed at the bottom section of the side wall 241, so that when the movable portion 32 is lifted forward, the two side edges of the movable portion 32 are displaced forward to a degree that does not exceed the edge 244 of the air outlet 243. Referring to fig. 4, the edge 244 of the exhaust port 243 of the sidewall 241 is not limited to be spaced apart from the bottom plate 21 by a fixed distance, and in another variation of the present embodiment, as shown in fig. 9, the edge 244 of each exhaust port 243 is spaced apart from the bottom plate 21 by a variable distance t, and the variable distance t of the exhaust port 243 is gradually decreased from the position adjacent to the first enclosing wall 23 to the position away from the first enclosing wall 23. Therefore, the airtight area adjacent to the valve port 211 can be enlarged, so that the droplets are blocked, and the droplets are further reduced to be discharged along with the expiration.

Referring to fig. 10 and 11, a second embodiment of the present invention, which is substantially the same as the first embodiment, also includes the housing 2 and the valve flap 3. The difference lies in that:

the housing 2 further includes a flange 26 surrounding the first wall 23 and the second wall 24, and a step 27 formed around an inner surface of the first wall 23 and an inner surface of the second wall 24.

The bottom plate 21 is connected to the step edge 27. Therefore, the bottom plate 21 is not exposed outside the first enclosing wall 23 and the second enclosing wall 24. Additional details will not be set forth in order to provide those skilled in the art with a understanding of the above description.

From the above description, the advantages of the foregoing embodiments can be summarized as follows:

1. according to the invention, due to the design that the upper part of the valve flap 3 is narrow and the lower part is wide (the valve flap is narrow and the rear part is wide when being lifted), when the movable part 32 is lifted forwards to open the valve port 211, the gap between the movable part and the first enclosing wall 23 can be enlarged, so that airflow can rapidly flow from the buffer chamber 230 to the discharge chamber 240 through the gap, and the smoothness of exhaust is further improved.

2. In addition, the present invention uses the special space design of the buffer chamber 230, the discharge chamber 240 and the valve flap 3, and uses the first enclosing wall 23 and the front wall 22 to block the droplets under the condition of not affecting the smoothness of the exhaust, so that the droplets are not discharged along with the exhalation, and the droplets can be prevented from spreading, and the downward exhaust mode can avoid the influence of the airflow on the sight line or the blurred sight line.

3. Since the shape of the first enclosing wall 23 matches the shape of the movable portion 32 of the valve flap 3 and the gap between the two is small when the movable portion 32 closes the valve port 211, and further, the movable portion 32 of the valve flap 3 is away from the

exhaust ports

243, 245, and the buffer chamber 230 is not directly communicated with the

exhaust ports

243, 245, when the movable portion 32 of the valve flap 3 is lifted back toward the sealing surface 213 from the forward state, the external air entering the discharge chamber 240 from the

exhaust ports

243, 245 acts on the movable portion 32 to generate a thrust force, and when the valve port 211 is closed, the thrust force is larger because the gap is smaller and larger, so that the movable portion 32 is quickly closed toward the sealing surface 213.

4. It is important that the opening of the sealing surface 213 is gradually reduced and the opening is far away from the

air outlet

243, 245 when the movable portion 32 is closed, the external air does not reach the opening after traveling a long distance, and the valve flap 3 is closed, so that the external air polluted by dirt, virus and germs is blocked by the valve flap 3 and cannot pass through the valve port 211, thereby effectively improving the protection effect.

5. In addition, based on the aforesaid valve flap 3 can be closed quickly, and the design that the distance between the front wall 22 and the bottom plate 21 is not less than 12.5mm, the valve flap 3 can form a large opening relative to the sealing surface 213, so as to accelerate and increase the exhaust volume, and further improve the smoothness during exhaust.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.

Claims

1. An exhalation valve, comprising:

the shell comprises a bottom plate, a front wall spaced from the bottom plate, a first enclosing wall and a second enclosing wall which are mutually connected into a surrounding shape and connected with the bottom plate and the front wall, wherein the bottom plate is provided with a valve port for air flow to enter and a sealing surface surrounding the valve port; and

the valve clack comprises a fixed part and a movable part which are arranged oppositely;

the method is characterized in that:

the front wall of the shell is airtight, the first enclosing wall is airtight and defines a buffer chamber, the second enclosing wall defines a discharge chamber and is provided with at least one exhaust port communicated with the discharge chamber and the outside;

the fixed part of the valve clack is fixed on one side of the valve port and is close to the discharge chamber, the movable part is far away from the discharge chamber and movably covers the sealing surface, and the movable part is suitable for being pushed by airflow to open the valve port, so that the airflow flows towards the discharge chamber after entering the buffer chamber and then is discharged outside through the at least one exhaust port.

2. The exhalation valve of claim 1, wherein: the inner surface of the front wall is spaced from the bottom plate by a distance not less than 12.5 mm.

3. The exhalation valve of claim 1, wherein: the second enclosure wall has two spaced apart side walls and an end wall connecting the side walls and the front wall, at least one of the side walls and the end wall having the at least one exhaust port.

4. The exhalation valve of claim 3, wherein: the movable portion of the valve flap extends from the end wall to the first enclosing wall, and the width of the valve flap along the side wall is gradually reduced from the fixed portion to the movable portion.

5. The exhalation valve of claim 3, wherein: the shape of the first enclosing wall is matched with the shape of the movable part of the valve clack.

6. The exhalation valve of claim 5, wherein: when the movable part of the valve clack closes the valve port, a gap is at least separated from the first enclosing wall, and the maximum distance of the gap is not more than 5 mm.

7. The exhalation valve of claim 3, wherein: the side wall of the second enclosing wall is provided with a plurality of exhaust ports, the exhaust port of each side wall is provided with an edge adjacent to the bottom plate, the edge of the exhaust port of each side wall is separated from the bottom plate by a variable distance, and the variable distance of the exhaust port of the side wall is gradually reduced from the position adjacent to the first enclosing wall to the position far away from the first enclosing wall.

8. The exhalation valve of claim 3, wherein: the shell is also provided with a fixing part pressed on the valve clack and a continuous pressing plane.

9. The exhalation valve of claim 8, wherein: the shell further comprises a pressing part extending from the inner surface of the front wall to the bottom plate, the pressing part is provided with a pressing plane formed at one end, and a through hole penetrating from the end wall to the direction of the first enclosing wall.

10. The exhalation valve of claim 3, wherein: the bottom plate of the housing also has a load-bearing wall surrounding the valve port, the load-bearing wall having the sealing surface formed at one end surface, the sealing surface having an arcuate recessed portion facing the front wall and recessed toward the middle from both end portions adjacent to the end wall and the first enclosing wall.