A diaphragm structure and low-noise air leakage valve

Abstract

The present invention relates to the field of fluid control, and specifically to a diaphragm structure and a low-noise air leakage valve. A diaphragm structure comprises a diaphragm body, on which a mass block is arranged. A low-noise air leakage valve comprises a valve housing, in which a diaphragm structure is built, and the diaphragm structure divides the inner cavity of the valve housing into an air inlet side and an air outlet side. An air flow channel is arranged on the diaphragm body, and a one-way cut-off structure for controlling the air flow interruption of the air flow channel is also included. When the air pressure on the air inlet side is greater than the air pressure on the air outlet side, the one-way cut-off structure controls the air flow on the air inlet side to flow to the air outlet side through the air flow channel. By arranging a mass block on the diaphragm body, the natural frequency of the diaphragm structure is reduced, and the higher frequency self-excited resonance is eliminated, so as to achieve the effect of not generating sharp whistling; the lower frequency self-excited resonance is changed to a self-excited resonance with a frequency lower than 20Hz, so as to achieve the effect of not generating audible noise.

Description

Technical Field

[0001] The invention relates to the field of fluid control, in particular to a diaphragm structure and a low-noise air leakage valve. Background Art

[0002] With the advent of wrist sphygmomanometers, a new type of sphygmomanometer (watch-type sphygmomanometer) that is different from the wrist sphygmomanometer has become a new development direction. The watch-type sphygmomanometer has a body located on the back of the hand and is compatible with electronic voice, which puts higher requirements on core components such as air pumps and air leakage valves, such as miniaturization and low noise.

[0003] When the gas flows through the leak valve cavity, it generates self-excited vibration. When the self-excited vibration frequency is the same as the natural frequency of the cavity subcomponent, the subcomponent generates self-excited resonance, and the amplitude increases sharply. If the vibration frequency is within the audible sound range (the frequency of audible sound is 20-20000Hz), it will generate obvious noise. As the frequency increases, the tone becomes more and more sharp and harsh. For example, the vent valve, integrated air pump and electronic sphygmomanometer disclosed in the application with publication number CN103767695A, the air valve, integrated air pump and wearable electronic sphygmomanometer disclosed in the application with publication number CN104825145A, and the valve and fluid control device disclosed in the application with publication number CN107091220A, in the above three applications, the cavity is composed of a valve shell and a diaphragm. The valve shell has a large stiffness and a natural frequency of more than 20000Hz, and the diaphragm has a small stiffness and a natural frequency of less than 20000Hz. Self-excited vibration will produce vibrations of various frequencies, and the diaphragm will inevitably undergo self-resonance. Higher-frequency self-excited resonance will produce sharp howling, while lower-frequency self-excited resonance will produce low noise. Louder noise can easily cause voice recognition failure and affect the product experience. Summary of the invention

[0004] In order to solve the problem that the leakage valve in the prior art generates a large noise due to self-excited resonance, causing voice recognition failure and affecting product experience, the present invention proposes a diaphragm structure and a low-noise leakage valve to solve the above technical problems. The technical solution of the present invention is as follows:

[0005] A diaphragm structure comprises a diaphragm body, on which a mass block is arranged. Assuming the natural frequency of the object is f, then Among them, K is the stiffness of the object, m is the mass of the object, and when the mass m of the diaphragm structure increases several times and the K value remains unchanged, the natural frequency f decreases accordingly. According to the above formula, by setting a mass block on the diaphragm body, the natural frequency of the diaphragm structure is reduced, the higher frequency self-excited resonance is eliminated, and the effect of not generating sharp whistling is achieved; the lower frequency self-excited resonance is changed to a self-excited resonance with a frequency lower than 20Hz, so as to achieve the effect of not generating audible noise.

[0006] A low-noise air leakage valve comprises a valve housing, wherein the valve housing has a built-in diaphragm structure, the diaphragm structure divides the inner cavity of the valve housing into an air inlet side and an air outlet side, an air flow channel is provided on the diaphragm body, and also comprises a one-way cut-off structure for controlling the air flow interruption of the air flow channel, when the air pressure on the air inlet side is greater than the air pressure on the air outlet side, the one-way cut-off structure controls the air flow on the air inlet side to flow to the air outlet side through the air flow channel.

[0007] Furthermore, a first air inlet hole is opened on the valve shell at the air inlet side, and an air storage hole and an air outlet hole are opened on the valve shell at the air outlet side. The mass block is located at the air outlet side and aligned with the air outlet hole, and the mass block can cover the air outlet hole.

[0008] Further, the air flow channel is a first air hole, and the one-way cut-off structure includes an umbrella valve or a fish-mouth valve arranged on the diaphragm body; or, the one-way cut-off structure includes a cylinder connected to the first air hole and extending toward the air inlet side, and the outer end of the cylinder abuts against the inner wall of the valve housing; or, the one-way cut-off structure includes a first boss arranged on the inner wall of the valve housing, the first boss is located on the air inlet side and extends toward the first air hole, and the outer end of the first boss abuts against the diaphragm body to close the first air hole.

[0009] Furthermore, the one-way cut-off structure includes a cylindrical valve body vertically arranged on the diaphragm body, and a closed limiting structure is provided at one end of the cylindrical valve body on the air outlet side, and an open shape is formed at one end of the cylindrical valve body on the air inlet side, and the air flow channel is a second air hole arranged on the side wall of the cylindrical valve body.

[0010] Furthermore, a gas storage hole and an air outlet hole are provided on the valve shell located on the air outlet side, the mass block is located on the air outlet side and aligned with the air outlet hole, and the mass block can cover the air outlet hole; a first air inlet hole and a second air inlet hole are provided on the valve shell located on the air inlet side, the first air inlet hole and the second air inlet hole are separated from each other, the first air inlet hole is set corresponding to the mass block, and the second air inlet hole is set corresponding to the airflow channel.

[0011] Further, the air flow channel is a first air hole, and the one-way cut-off structure includes a second boss which is arranged on the diaphragm body and the end face of which can cover the second air inlet hole, and the second boss is arranged close to the first air hole; or, the one-way cut-off structure includes an air inlet channel which is connected to the second air inlet hole and extends toward the diaphragm body, the outer end of the air inlet channel abuts against the diaphragm body, and the first air hole deviates from the air inlet channel.

[0012] Furthermore, the air flow channel includes a mounting hole arranged on the diaphragm body, and the one-way cut-off structure includes a distributed cantilever beam valve plate installed in the mounting hole, the distributed cantilever beam valve plate includes a valve plate body and a cantilever, and the valve plate body is arranged in the mounting hole through the cantilever. In an initial state, the valve plate body covers the second air inlet hole.

[0013] Furthermore, the mass block is columnar, and the mass block is aligned with the center of the air outlet. When the mass block covers the air outlet, the closest distance D from the edge of the mass block to the edge of the air outlet is in the range of 0.1 mm≤D≤1 mm.

[0014] Furthermore, the diaphragm body is an integrated structure or a split structure.

[0015] Furthermore, the valve housing includes a first valve housing and a second valve housing which are sealed and connected, and the second valve housing is located on the air inlet side of the diaphragm structure. When the one-way shut-off structure includes an umbrella valve or a fish-mouth valve, the second valve housing is replaced by an air pressure generating device.

[0016] Further, the valve housing comprises a first valve housing and a second valve housing that cooperate with each other, the second valve housing is located on the air inlet side of the diaphragm structure, and the second valve housing is replaced by an air pressure generating device.

[0017] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0018] 1. The diaphragm structure and the air leakage valve of the present invention reduce the natural frequency of the diaphragm structure by arranging a mass block on the diaphragm body, eliminate the higher frequency self-excited resonance, and achieve the effect of not generating sharp whistling; change the lower frequency self-excited resonance to a self-excited resonance with a frequency lower than 20 Hz, and achieve the effect of not generating audible noise;

[0019] 2. The air leakage valve of the present invention is provided with an air flow channel and a one-way cut-off structure for controlling the opening and closing of the air flow channel. Only when the air pressure on the air inlet side is greater than the air pressure on the air outlet side, the air flow on the air inlet side can flow to the air outlet side through the air flow channel. Otherwise, the air flow cannot flow from the air outlet side to the air inlet side through the air flow channel. The one-way delivery of the air flow under the action of the pressure difference is realized, and no other control components are required, and the structure is simple.

[0020] 3. The leaking valve of the present invention is provided with structures such as an air inlet hole, an air outlet hole and an air storage hole on the valve housing, so that the air flows into the leaking valve through the air inlet hole, and then flows to the air storage device through the air storage hole. When a certain amount of gas is stored in the air storage device, the air intake is stopped, and the gas in the air storage device flows out through the air outlet hole, thereby realizing quantitative delivery of the air flow;

[0021] 4. The leakage valve of the present invention is provided with a one-way cut-off structure on the diaphragm body, or a one-way cut-off structure cooperating with the diaphragm body is provided on the valve housing. During the air intake process, the air pressure on the air intake side is greater than the air pressure on the air outlet side. The air pressure on the air intake side pushes the one-way cut-off structure or separates the one-way cut-off structure from the diaphragm body to open the air flow channel. During this process, a certain pressure drop will be generated, so that the air pressure on the air outlet side of the diaphragm structure is lower than the air pressure on the air intake side. Under the action of the pressure difference, the mass block on the diaphragm body will be pressed against the air outlet, so that the air outlet is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the diaphragm structure of the present invention;

[0023] Figure 2 This is a schematic structural diagram of an air leakage valve according to Embodiment 1 of the present invention;

[0024] Figure 3 for Figure 2 A magnified view of part A;

[0025] Figure 4 It is a structural schematic diagram when the diaphragm structure in the first embodiment is an integrated structure;

[0026] Figure 5 It is a structural schematic diagram of the umbrella valve in the first embodiment;

[0027] Figure 6 is the corresponding structural diagram of the mass block and the air outlet;

[0028] Figure 7 is a schematic structural diagram of the case where the diaphragm structure in the first embodiment is a split structure;

[0029] Figure 8 It is a structural schematic diagram of the air leakage valve when the diaphragm structure is a split structure;

[0030] Fig. 9 This is a structural schematic diagram when the second valve housing is replaced with an air pressure generating device and the diaphragm structure is an integrated structure;

[0031] Fig.10 This is a structural schematic diagram when the second valve housing is replaced with an air pressure generating device and the diaphragm structure is a split structure;

[0032] Fig.11 It is a structural schematic diagram of the air leakage valve of the second embodiment of the present invention;

[0033] Fig.12 for Fig.11 A magnified view of part B;

[0034] Fig.13 This is a schematic structural diagram of an air leakage valve according to Embodiment 3 of the present invention;

[0035] Fig.14 for Fig.13 Enlarged view of part C;

[0036] Fig.15 It is a structural schematic diagram of an air leakage valve according to a fourth embodiment of the present invention;

[0037] Fig.16 for Fig.15 A magnified view of the D portion;

[0038] Fig.17 This is a schematic structural diagram of an air leakage valve according to a fifth embodiment of the present invention;

[0039] Fig.18 for Fig.17 A magnified view of part E;

[0040] Fig.19 This is a schematic structural diagram of an air leakage valve according to a sixth embodiment of the present invention;

[0041] Fig. 20 for Fig.19 Magnified view of part F;

[0042] Fig.21 This is a schematic structural diagram of an air leakage valve according to Embodiment 7 of the present invention;

[0043] Fig. 22 for Fig.21 Enlarged view of the G section;

[0044] Fig.23 This is a schematic structural diagram of an air leakage valve according to Embodiment 8 of the present invention;

[0045] Fig.24 for Fig.23 A magnified view of the H part;

[0046] In the figure: 1-diaphragm structure; 11-diaphragm body; 11a-first diaphragm; 11b-second diaphragm; 111-first air hole; 112-mounting hole; 12-mass block; 13-umbrella valve; 14-fish mouth valve; 15-cylindrical valve body; 151-second air hole; 16-cylinder; 17-second boss; 18-distributed cantilever beam valve plate; 181-valve plate body; 182-cantilever; 131-umbrella cover; 132- Umbrella handle; 133-limiting protrusion; 2-valve housing; 21-first valve housing; 22-second valve housing; 211-air storage hole; 212-air storage hole; 221-first air inlet hole; 222-second air inlet hole; 223-first boss; 224-air inlet channel; 225-upper convex channel; 226-partition structure; 3-air outlet cavity; 4-air inlet cavity; 41-first air inlet cavity; 42-second air inlet cavity; 5-air pressure generating device. DETAILED DESCRIPTION

[0047] The content of the present invention will be further described below in conjunction with the accompanying drawings.

[0048] Embodiment 1

[0049] like Figure 1-10 As shown, this embodiment provides a diaphragm structure, the diaphragm structure 1 includes a diaphragm body 11, and a mass block 12 is arranged on the diaphragm body 11. Specifically, the mass block 12 is columnar, and its cross section can be circular, polygonal, or other closed areas, and the end surface of the mass block 12 away from the diaphragm body 11 is flat.

[0050] Preferably, the diaphragm body 11 can produce a certain elastic deformation; the material of the diaphragm body 11 can be selected from but not limited to TPU, silicone rubber, and stainless steel. Preferably, the mass block 12 and the diaphragm body 11 can be integrally arranged or fixedly connected. The mass block 12 can be an elastomer or a non-elastic body. The material of the mass block 12 can be selected from but not limited to rubber, stainless steel, lead, and ceramic; preferably, the material of the mass block 12 is TPU.

[0051] Furthermore, a sealing gasket may be provided on the end surface of the mass block 12 away from the diaphragm body 11 to facilitate sealing during use. The material of the sealing gasket may be selected but not limited to rubber; preferably, the material of the sealing gasket is TPU.

[0052] By setting a mass block on the diaphragm body, the natural frequency of the diaphragm structure is reduced, and the higher frequency self-excited resonance is eliminated, so as to achieve the effect of not generating sharp howling; the lower frequency self-excited resonance is changed to a self-excited resonance with a frequency lower than 20Hz, so as to achieve the effect of not generating audible noise.

[0053] The present embodiment also provides a low-noise air leakage valve, including a valve housing 2, the valve housing 2 having the above-mentioned diaphragm structure 1 built therein, the valve housing 2 having an inner cavity, the diaphragm structure 1 dividing the interior of the valve housing 2 into an air inlet side and an air outlet side. In the present embodiment, a valve cavity is formed inside the valve housing 2, and the diaphragm structure 1 is arranged inside the valve cavity, dividing the valve cavity into an air inlet cavity 4 and an air outlet cavity 3.

[0054] The diaphragm structure 1 is also provided with an air flow channel, through which the air inlet chamber 4 and the air outlet chamber 3 are connected, and the opening and closing of the air flow channel is controlled by a one-way cut-off structure. In the initial state, the one-way cut-off structure closes the air flow channel, and only when the air pressure of the air inlet chamber 4 is greater than the air pressure of the air outlet chamber 3, the one-way cut-off structure controls the air flow channel to open. In this embodiment, the air flow channel is a first air hole 111, and the one-way cut-off structure is an umbrella valve 13 provided on the diaphragm structure 1. Specifically, a mounting hole 112 is provided on the diaphragm body 11, and the umbrella valve 13 is installed in the mounting hole 112. The umbrella valve 13 includes an umbrella cover 131, an umbrella handle 132 and a limiting protrusion 133, wherein the limiting protrusion 133 is located at the end of the umbrella handle 132 away from the umbrella cover 131, the umbrella handle 132 passes through the mounting hole 112, the umbrella cover 131 is located in the air outlet chamber 3, and the limiting protrusion 133 is located in the air inlet chamber 4. The first air hole 111 is provided on the diaphragm body 11, and the first air hole 111 is located within the coverage of the umbrella cap 131. When the edge of the umbrella cap 131 contacts the diaphragm body 11, the air inlet cavity 4 and the air outlet cavity 3 are not connected; when the edge of the umbrella cap 131 does not contact the diaphragm body 11, the air inlet cavity 4 and the air outlet cavity 3 are connected through the first air hole 111. Preferably, there may be one or more first air holes 111, and the one or more first air holes 111 are all within the coverage of the umbrella cap 131.

[0055] The valve housing 2 includes a first valve housing 21 and a second valve housing 22, the edges of which are sealed and fixedly connected, an air outlet cavity 3 is formed between the first valve housing 21 and the diaphragm body 11, and the second valve housing 22 is located on the air inlet side of the diaphragm body 11. The first valve housing 21 is provided with an air storage hole 211 and an air outlet hole 212, both of which are connected to the air outlet cavity 3, and the air storage hole 211 can be connected to an external air storage device. When inletting, the gas entering the air outlet cavity 3 enters the air storage device through the air storage hole 211 for air storage; when outletting, the gas in the air storage device enters the air outlet cavity 3 through the air storage hole 211 and is then discharged through the air outlet hole 212, so that quantitative delivery of air flow can be achieved. Preferably, the air storage hole 211 is convex outward, which is convenient for connection with the air storage device. The second valve housing 22 is provided with a first air inlet hole 221, and the first air inlet hole 221 is connected to the air inlet cavity 4.

[0056] Furthermore, the mass block 12 is located in the air outlet cavity 3, and the mass block 12 is arranged corresponding to the air outlet hole 212, and the end surface of the mass block 12 away from the diaphragm body 11 can cover the air outlet hole 212. Specifically, the end surface of the mass block 12 away from the diaphragm body 11 is close to the air outlet hole 212 or in contact with the air outlet hole 212; preferably, the mass block 12 is aligned with the center of the air outlet hole 212, and the air outlet hole 212 can be a circular hole, a triangular hole, a square hole, etc. The cross-section of the mass block 12 can be in various shapes. When the mass block 12 covers the air outlet hole 212, the closest distance D from the edge of the mass block 12 to the edge of the air outlet hole 212 is in the range of 0.1mm≤D≤1mm. Figure 6 , taking the case where the air outlet 212 is a circular air outlet and the cross section of the mass block 12 is a circular air outlet, the air outlet 212 and the mass block 12 are coaxially arranged, and the closest distance from the edge of the mass block 12 to the edge of the air outlet 212 is D, and the range of D is 0.1mm≤D≤1mm. If the closest distance from the edge of the mass block 12 to the edge of the air outlet 212 is too small, the mass block 12 may not be able to well seal the air outlet 212 during the air intake process; if the closest distance from the edge of the mass block 12 to the edge of the air outlet 212 is too large, the flow capacity will be reduced.

[0057] Preferably, if Figure 7-8 As shown, the diaphragm body 11 can be set in a split form, and the diaphragm body 11 includes a first diaphragm 11a and a second diaphragm 11b. The first diaphragm 11a is provided with a first air hole 111 and a mounting hole 112. The umbrella valve 13 is installed on the first diaphragm 11a, and a mass block 12 is provided on the second diaphragm 11b. The first diaphragm 11a and the second diaphragm 11b together divide the inner cavity of the valve housing 2 into an air inlet cavity 4 and an air outlet cavity 3.

[0058] Preferably, if Figure 9-10 As shown, the second valve housing 22 is replaced by an air pressure generating device 5 . The air pressure generating device 5 can directly generate gas without setting an air inlet hole for air intake. The airflow generated by the air pressure generating device 5 directly enters the air inlet cavity 4 .

[0059] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0060] When air is inhaled, an airflow with a certain pressure enters the air inlet chamber 4 through the first air inlet hole 221 or the airflow generated by the air pressure generating device 5 directly enters the air inlet chamber 4. At this time, the air pressure in the air inlet chamber 4 is greater than the air pressure in the air outlet chamber 3, and the diaphragm body 11 deforms toward the air outlet chamber 3. The mass block 12 covers and closes the air outlet hole 212. The pressure airflow pushes the umbrella cover 131 of the umbrella valve 13 to move in a direction away from the diaphragm body 11. The edge of the umbrella cover 131 separates from the diaphragm body 11, and the air in the air inlet chamber 4 passes through the first air hole 11. 1 enters the air outlet cavity 3; when the air outlet hole 212 is closed, the air flow can only flow out to the air storage device through the air storage hole 211; during the air intake process, a certain pressure drop will be generated because the pressure air flow flows through the first air hole 111 and overcomes the elastic force generated by the deformation of the umbrella cover. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continuously closes the air outlet hole 212, and the umbrella valve 13 continuously opens, ensuring that the air intake cavity 4 and the air outlet cavity 3 are connected through the first air hole 111;

[0061] When air is discharged, the first air inlet 221 stops intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet chamber 3 through the air storage hole 211. At this time, the air pressure in the air outlet chamber 3 is greater than the air pressure in the air inlet chamber 4. Under the action of the pressure difference, the umbrella cover 131 of the umbrella valve 13 is pressed against the diaphragm body 11, and the first air hole 111 is closed; at the same time, the diaphragm body 11 is deformed toward the air inlet chamber 4 under the action of the pressure difference, the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet chamber 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional conveying of the air flow.

[0062] Embodiment 2

[0063] like Figure 11-12 As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the first embodiment, and the only difference is that the one-way cut-off structure is a fish-mouth valve 14, the fish-mouth valve 14 is located in the air outlet cavity 3, the end of the fish-mouth valve 14 with a larger opening is fixedly connected to the diaphragm body 11, and the fish-mouth valve 14 is connected to the first air hole 111. The first air hole 111 can be one or more, and the one or more first air holes 111 are all within the coverage of the fish-mouth valve 14.

[0064] Similar to the first embodiment, preferably, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, a first air hole 111 is arranged on the first diaphragm, a fish-mouth valve 14 is installed on the first diaphragm, and a mass block 12 is arranged on the second diaphragm, and the first diaphragm and the second diaphragm together divide the inner cavity of the valve housing 2 into an air inlet cavity 4 and an air outlet cavity 3.

[0065] Preferably, the second valve housing 22 is replaced by an air pressure generating device, which can directly generate gas without providing an air inlet hole for air intake. The airflow generated by the air pressure generating device directly enters the air inlet cavity 4.

[0066] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0067] When air is inhaled, an air flow with a certain pressure enters the air inlet chamber 4 through the first air inlet hole 221 or the air flow generated by the air pressure generating device 5 directly enters the air inlet chamber 4. At this time, the air pressure in the air inlet chamber 4 is greater than the air pressure in the air outlet chamber 3, and the diaphragm body 11 is deformed toward the air outlet chamber 3. The mass block 12 covers and closes the air outlet hole 212. The pressure air flows through the first air hole 111 into the interior of the fish-mouth valve 14, pushing the fish-mouth valve 14 to open. The air flow in the air inlet chamber 4 enters the air outlet chamber 3 through the first air hole 111 and the fish-mouth valve 14. cavity 3; when the air outlet hole 212 is closed, the air flow can only flow out to the air storage device through the air storage hole 211; during the air intake process, a certain pressure drop will be generated due to the pressure air flow flowing out of the first air hole 111 and overcoming the tension generated by the deformation of the fish mouth valve 14. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continuously closes the air outlet hole 212, and the fish mouth valve 14 continuously opens, ensuring that the air intake cavity 4 and the air outlet cavity 3 are connected through the first air hole 111;

[0068] When air is discharged, the first air inlet 221 stops intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet chamber 3 through the air storage hole 211. At this time, the air pressure in the air outlet chamber 3 is greater than the air pressure in the air inlet chamber 4. Under the action of the pressure difference, the fish-mouth valve 14 is closed and the first air hole 111 is closed; at the same time, the diaphragm body 11 is deformed toward the air inlet chamber 4 under the action of the pressure difference, the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet chamber 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional transport of the air flow.

[0069] Embodiment 3

[0070] like Figure 13-14As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the first embodiment, and the only difference is that the one-way cut-off structure includes a cylindrical valve body 15 installed on the diaphragm body 11, and the diaphragm body 11 is provided with a mounting hole 112. The cylindrical valve body 15 is a cylindrical structure with one end open. The closed end of the cylindrical valve body 15 is provided with a closed limiting structure. The outer diameter of the closed limiting structure is greater than the outer diameter of the cylindrical portion of the cylindrical valve body 15. The side wall of the cylindrical portion of the cylindrical valve body 15 is provided with a second air hole 151, and the second air hole 151 is an air flow channel. During installation, the cylindrical portion of the cylindrical valve body 15 is located in the mounting hole 112, and the closed limiting structure is located in the air outlet cavity 3. The open end of the cylindrical valve body 15 is located in the air inlet cavity 4, and the second air hole 151 is connected to the inside of the cylindrical valve body 15.

[0071] Preferably, the second air hole 151 is arranged close to the closed limiting structure.

[0072] Preferably, similar to the first embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm. The first diaphragm is provided with a mounting hole, and the cylindrical valve body 15 is installed in the mounting hole of the first diaphragm. The mass block 12 is arranged on the second diaphragm. The first diaphragm and the second diaphragm together divide the inner cavity of the valve housing 2 into an air inlet cavity 4 and an air outlet cavity 3.

[0073] Preferably, the second valve housing 22 is replaced by an air pressure generating device, which can directly generate gas without providing an air inlet hole for air intake. The airflow generated by the air pressure generating device directly enters the air inlet cavity 4.

[0074] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0075] When air is inhaled, an airflow with a certain pressure enters the air inlet chamber 4 through the first air inlet hole 221 or the airflow generated by the air pressure generating device 5 directly enters the air inlet chamber 4. At this time, the air pressure in the air inlet chamber 4 is greater than the air pressure in the air outlet chamber 3, and the diaphragm body 11 deforms toward the air outlet chamber 3. The mass block 12 covers and closes the air outlet hole 212. The pressure airflow pushes the cylindrical valve body 15 to move toward the direction close to the first valve shell 21. When the second air hole 151 is located in the air outlet chamber 3, the air inlet chamber 4 and the air outlet chamber 3 are connected through the cylindrical valve body 15, and the air inlet The air flow in the cavity 4 enters the air outlet cavity 3 through the second air hole 151; when the air outlet hole 212 is closed, the air flow can only flow out to the air storage device through the air storage hole 211; during the air intake process, a certain pressure drop will be generated when the pressure air flows through the second air hole 151. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continuously closes the air outlet hole 212, and the cylindrical valve body 15 continuously opens, ensuring that the air intake cavity 4 and the air outlet cavity 3 are connected through the second air hole 151;

[0076] When air is discharged, the first air inlet hole 221 stops intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet chamber 3 through the air storage hole 211. At this time, the air pressure in the air outlet chamber 3 is greater than the air pressure in the air inlet chamber 4. Under the action of the pressure difference, the cylindrical valve body 15 is pressed against the diaphragm body 11, and the second air hole 151 is closed; at the same time, the diaphragm body 11 is deformed toward the air inlet chamber 4 under the action of the pressure difference, the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet chamber 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional transport of the air flow.

[0077] Embodiment 4

[0078] like Figure 15-16 As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the first embodiment, with the only difference being that the one-way cut-off structure includes a cylinder 16 mounted on the diaphragm body 11, the cylinder 16 is in the shape of a cylinder with openings at both ends, the cylinder 16 is connected to the first air hole 111, the cylinder 16 is located in the air inlet cavity 4, and the outer end face of the cylinder 16 away from the diaphragm body 11 abuts against the inner wall of the second valve housing 22.

[0079] Preferably, similar to the first embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, the first diaphragm is provided with a first air hole 111, the cylinder 16 is provided on the first diaphragm, and the mass block 12 is provided on the second diaphragm, and the first diaphragm and the second diaphragm together divide the inner cavity of the valve housing 2 into an air inlet cavity 4 and an air outlet cavity 3.

[0080] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0081] When air is inhaled, an airflow with a certain pressure enters the air inlet chamber 4 through the first air inlet hole 221 or the airflow generated by the air pressure generating device 5 directly enters the air inlet chamber 4. At this time, the air pressure in the air inlet chamber 4 is greater than the air pressure in the air outlet chamber 3, and the diaphragm body 11 deforms toward the air outlet chamber 3. The mass block 12 covers and closes the air outlet hole 212. At the same time, the diaphragm body 11 drives the cylinder 16 to move in a direction away from the second valve housing 22. A gap is generated between the outer end of the cylinder 16 and the second valve housing 22. The airflow in the air inlet chamber 4 passes through the gap, the cylinder 16 and the first valve housing 22 in turn. The air hole 111 enters the air outlet cavity 3; when the air outlet hole 212 is closed, the air flow can only flow out to the air storage device through the air storage hole 211; during the air intake process, since the pressure air flow flows through the gap and the first air hole 111, a certain pressure drop will occur. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continues to close the air outlet hole 212, and the gap between the cylinder 16 and the second valve housing 22 continues to exist, ensuring that the air intake cavity 4 and the air outlet cavity 3 are connected through the first air hole 111;

[0082] When air is discharged, the first air inlet hole 221 stops intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet chamber 3 through the air storage hole 211. At this time, the air pressure in the air outlet chamber 3 is greater than the air pressure in the air inlet chamber 4. Under the action of the pressure difference, the cylinder 16 is pressed against the inner wall of the second valve shell 22, and the air outlet chamber 3 and the air inlet chamber 4 are not connected; at the same time, the diaphragm body 11 is deformed toward the air inlet chamber 4 under the action of the pressure difference, the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet chamber 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional air flow.

[0083] Embodiment 5

[0084] like Figure 17-18 As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the first embodiment, and the only difference is that the one-way cut-off structure includes a first boss 223 arranged on the second valve housing 22, and the first boss 223 extends toward the first air hole 111. The outer end of the first boss 223 abuts against the diaphragm body 11 to close the first air hole 111.

[0085] Preferably, similar to the first embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, a first air hole 111 is arranged on the first diaphragm, and a mass block 12 is arranged on the second diaphragm, and the first diaphragm and the second diaphragm together divide the inner cavity of the valve housing 2 into an air inlet cavity 4 and an air outlet cavity 3.

[0086] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0087] When air is inhaled, an airflow with a certain pressure enters the air inlet cavity 4 through the first air inlet hole 221 or the airflow generated by the air pressure generating device 5 directly enters the air inlet cavity 4. At this time, the air pressure in the air inlet cavity 4 is greater than the air pressure in the air outlet cavity 3, and the diaphragm body 11 is deformed toward the air outlet cavity 3. The mass block 12 covers and closes the air outlet hole 212. At the same time, the diaphragm body 11 moves in a direction away from the first boss 223, and a gap is generated between the diaphragm body 11 and the first boss 223. The first air hole 111 is opened, and the air flow in the air inlet cavity 4 passes through the first air hole 111. into the air outlet cavity 3; when the air outlet hole 212 is closed, the air flow in the air outlet cavity 3 can only flow out to the air storage device through the air storage hole 211; during the air intake process, a certain pressure drop will be generated due to the pressure air flow flowing through the first air hole 111. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continues to close the air outlet hole 212, and the gap between the diaphragm body 11 and the first boss 223 continues to exist, ensuring that the air intake cavity 4 and the air outlet cavity 3 are connected through the first air hole 111;

[0088] When exhausting, the first air inlet 221 stops intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet chamber 3 through the air storage hole 211. At this time, the air pressure in the air outlet chamber 3 is greater than the air pressure in the air inlet chamber 4. Under the action of the pressure difference, the diaphragm body 11 is pressed against the end face of the first boss 223, and the first air hole 111 is closed; at the same time, the diaphragm body 11 is deformed toward the air inlet chamber 4 under the action of the pressure difference, the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet chamber 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional air flow.

[0089] Embodiment 6

[0090] like Figure 19-20 As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the first embodiment, and the only difference is that: the second valve housing 22 is provided with a first air inlet hole 221 and a second air inlet hole 222, and a partition structure 226 extends from the second valve housing 22 to separate the first air inlet hole 221 from the second air inlet hole 222. Specifically, the partition structure 226 extends from the inner wall of the second valve housing 22 to the diaphragm body 11, and the partition structure 226 is sealed and connected to the diaphragm body 11, and the partition structure 226 divides the air inlet cavity 4 into a first air inlet cavity 41 and a second air inlet cavity 42. The first air inlet hole 221 is in communication with the first air inlet cavity 41, and the first air inlet cavity 41 is arranged corresponding to the mass block 12, and the second air inlet hole 222 is in communication with the second air inlet cavity 42, and the second air inlet cavity 42 is arranged corresponding to the air flow channel.

[0091] The air flow channel is a first air hole 111 arranged on the diaphragm body 11. The one-way cut-off structure includes an air inlet channel 224 connected to the second air inlet hole 222 and extending toward the diaphragm body 11. The end of the air inlet channel 224 is pressed against the diaphragm body 11, and the first air hole 111 is arranged away from the air inlet channel 224.

[0092] Preferably, similar to the first embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, the first diaphragm is provided with a first air hole 111, the second diaphragm is provided with a mass block 12, the second diaphragm separates the first air inlet cavity 41 and the air outlet cavity 3, and the first diaphragm separates the second air inlet cavity 42 and the air outlet cavity 3.

[0093] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0094] During air intake, an airflow with a certain pressure enters the first air intake cavity 41 through the first air intake hole 221, enters the air intake channel 224 through the second air intake hole 222, or the airflow generated by the air pressure generating device 5 directly enters the first air intake cavity 41 and the air intake channel 224. At this time, the air pressure in the first air intake cavity 41 is greater than the air pressure in the air outlet cavity 3, and the diaphragm body 11 drives the mass block 12 to cover and close the air outlet hole 212. At the same time, the air pressure in the air intake channel 224 is greater than the air pressure in the air outlet cavity 3. The diaphragm body 11 moves in a direction away from the air intake channel 224, and a gap is generated between the diaphragm body 11 and the air intake channel 224. The airflow in the air intake channel 224 can pass through The air in the air outlet cavity 3 is then passed through the first air hole 111 to the second air inlet cavity 42 through the gap, and then passed through the first air hole 111 to the air outlet cavity 3; when the air outlet hole 212 is closed, the air flow in the air outlet cavity 3 can only flow out to the air storage device through the air storage hole 211; during the air intake process, a certain pressure drop will be generated due to the pressure air flow in the air intake channel 224 flowing through the first air hole 111. Therefore, during the air intake process, the air pressure in the air intake cavity 4 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continues to close the air outlet hole 212, and the gap between the diaphragm body 11 and the air intake channel 224 continues to exist, ensuring that the air intake channel 224 and the air outlet cavity 3 are connected through the first air hole 111;

[0095] When exhausting, both the first air inlet hole 221 and the second air inlet hole 222 stop intake of air or the air pressure generating device 5 stops working, and the air flow in the air storage device flows into the air outlet cavity 3 through the air storage hole 211. At this time, the air pressure in the air outlet cavity 3 is greater than the air pressure in the two air inlet cavities. Under the action of the pressure difference, the diaphragm body 11 is pressed against the end face of the air inlet channel 224, and the second air inlet cavity 42 and the air inlet channel 224 are disconnected; at the same time, the diaphragm body 11 is deformed toward the first air inlet cavity 41 under the action of the pressure difference, and the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet cavity 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional air transport.

[0096] Embodiment 7

[0097] like Figure 21-22 As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the sixth embodiment, and the only difference is that the one-way cut-off structure includes a second boss 17 arranged on the diaphragm body 11, the second boss 17 is arranged close to the first air hole 111, the second boss 17 is located in the second air inlet cavity 42, and the second boss 17 extends toward the second air inlet hole 222. In the initial state, the end face of the second boss 17 can cover the second air inlet hole 222.

[0098] Preferably, similar to the sixth embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, the first diaphragm is provided with a first air hole 111 and a second boss 17, the second diaphragm is provided with a mass block 12, the second diaphragm separates the first air inlet cavity 41 and the air outlet cavity 3, and the first diaphragm separates the second air inlet cavity 42 and the air outlet cavity 3.

[0099] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0100] During air intake, an airflow with a certain pressure enters the first air intake cavity 41 through the first air intake hole 221 and enters through the second air intake hole 222. At this time, the air pressure in the first air intake cavity 41 is greater than the air pressure in the air outlet cavity 3. The diaphragm body 11 drives the mass block 12 to cover and close the air outlet hole 212. At the same time, the air pressure of the airflow entering through the second air intake hole 222 is greater than the air pressure in the air outlet cavity 3. The diaphragm body 11 drives the second boss 17 to move in a direction away from the second air intake hole 222. A gap is generated between the second boss 17 and the second air intake hole 222. The airflow entering through the second air intake hole 222 can enter the second air intake cavity 42 through the gap and then enter the second air intake cavity 42 through the first air intake hole 222. 111 enters the air outlet cavity 3; when the air outlet hole 212 is closed, the air flow in the air outlet cavity 3 can only flow out to the air storage device through the air storage hole 211; during the air intake process, since the pressure air flow entering through the second air inlet hole 222 will produce a certain pressure drop when flowing through the first air hole 111, therefore, during the air intake process, the air pressure of the air flow entering through the second air inlet hole 222 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continues to close the air outlet hole 212, and the gap between the second boss 17 and the second air inlet hole 222 continues to exist, ensuring that the air flow can enter the second air inlet cavity 42 through the second air inlet hole 222;

[0101] When exhausting, both the first air inlet hole 221 and the second air inlet hole 222 stop intake of air, and the air flow in the air storage device flows into the air outlet cavity 3 through the air storage hole 211. At this time, the air pressure in the air outlet cavity 3 is greater than the air pressure in the two air inlet cavities. Under the action of the pressure difference, the second boss 17 is pressed against the inner wall of the second valve shell 22, and the second boss 17 closes the second air inlet hole 222. At the same time, the diaphragm body 11 is deformed toward the first air inlet cavity 41 under the action of the pressure difference, and the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet cavity 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional transport of the air flow.

[0102] Embodiment 8

[0103] like Figure 23-24As shown, the diaphragm structure and the air leakage valve of this embodiment are basically the same as those of the sixth embodiment, and the only difference is that: the air flow channel includes a mounting hole 112 arranged on the diaphragm body 11, the one-way cut-off structure includes a distributed cantilever beam valve disc 18 installed in the mounting hole 112, the distributed cantilever beam valve disc 18 includes a valve disc body 181 and a cantilever 182, there are at least two cantilevers 182, the valve disc body 181 is arranged in the mounting hole 112 through the cantilever 182, and in the initial state, the valve disc body 181 covers the second air inlet hole 222. Specifically, the valve disc body 181 can be circular, square, triangular, polygonal, etc., and the cantilever 182 can be in various forms, and the cantilever 182 can be a straight cantilever with a uniform cross-section, a straight cantilever with a variable cross-section, a curved cantilever with a uniform cross-section, or a curved cantilever with a variable cross-section. The cross-sections of straight cantilevers with equal cross-sections are the same, and the centroid trajectory of the cross-sections is a straight line; the cross-sections of curved cantilevers with equal cross-sections are the same, and the centroid trajectory of the cross-sections is a curve; the cross-sections of straight cantilevers with variable cross-sections are different, and the centroid trajectory of the cross-sections is a straight line; the cross-sections of curved cantilevers with variable cross-sections are different, and the centroid trajectory of the cross-sections is a curve. Preferably, the cantilever 182 connected to the same valve body 181 can be cantilever of different shapes, as long as the valve body 181 can be moved up and down. Since the cantilever 182 does not completely close the mounting hole 112, the airflow can flow through the mounting hole 112.

[0104] Preferably, the second valve housing 22 is provided with an upward convex channel 225 communicating with the second air inlet hole 222 , and the outer end of the upward convex channel 225 protrudes relative to the inner wall of the second valve housing 22 , so that the valve plate body 181 can be pressed against the second air inlet hole 222 .

[0105] In this embodiment, only one air inlet cavity 4 is provided, and the air inlet cavity 4 is communicated with the first air inlet hole 221 .

[0106] Preferably, similar to the sixth embodiment, the diaphragm body 11 can be arranged in a split form, and the diaphragm body 11 includes a first diaphragm and a second diaphragm, the first diaphragm is provided with a mounting hole 112 and a distributed cantilever beam valve plate 18, the second diaphragm is provided with a mass block 12, and the first diaphragm separates the air inlet cavity 4 and the air outlet cavity 3.

[0107] Based on the above structure, the working principle of the air leakage valve in this embodiment is:

[0108] When air is inletted, an airflow with a certain pressure enters the air inlet cavity 4 through the first air inlet hole 221 and enters through the second air inlet hole 222. At this time, the air pressure in the air inlet cavity 4 is greater than the air pressure in the air outlet cavity 3. The diaphragm body 11 drives the mass block 12 to cover and close the air outlet hole 212. At the same time, the air pressure of the airflow entering through the second air inlet hole 222 is greater than the air pressure in the air outlet cavity 3. A gap is generated between the valve plate body 181 and the upper convex channel 225. The pressure airflow enters the air outlet cavity 3 through the gap and the mounting hole 112 in turn. When the air outlet hole 212 is closed, the pressure of the airflow is greater than the pressure in the air outlet cavity 3. When the second air inlet 222 is closed, the air flow in the air outlet cavity 3 can only flow out to the air storage device through the air storage hole 211; during the air intake process, the pressure air flow overcomes the cantilever beam preload and flows through the gap, so a pressure drop occurs. Therefore, during the air intake process, the air pressure of the air flow entering through the second air inlet 222 is always greater than the air pressure in the air outlet cavity 3. In this way, during the air intake process, the mass block 12 continues to close the air outlet hole 212, and the gap between the valve plate body 181 and the upper convex channel 225 continues to exist, ensuring that the air flow can enter the air outlet cavity 3 through the second air inlet 222.

[0109] When exhausting, both the first air inlet hole 221 and the second air inlet hole 222 stop intake of air, and the air flow in the air storage device flows into the air outlet cavity 3 through the air storage hole 211. At this time, the air pressure in the air outlet cavity 3 is greater than the air pressure in the two air inlet cavities. Under the action of the pressure difference, the valve plate body 181 is pressed against the upper convex channel 225, and the valve plate body 181 closes the second air inlet hole 222. At the same time, the diaphragm body 11 is deformed toward the air inlet cavity 4 under the action of the pressure difference, and the end face of the mass block 12 leaves the air outlet hole 212, the air outlet hole 212 opens, and the air flow in the air outlet cavity 3 flows out of the leakage valve through the air outlet hole 212, thereby realizing unidirectional transport of the air flow.

[0110] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A low noise air leakage valve, characterized in that: It comprises a valve housing (2), wherein the valve housing (2) has a diaphragm structure (1) built therein, wherein the diaphragm structure (1) comprises a diaphragm body (11), and a mass block (12) is vertically arranged on the diaphragm body (11); The diaphragm structure (1) divides the inner cavity of the valve housing (2) into an air inlet side and an air outlet side. The diaphragm body (11) is provided with an air flow channel and also includes a one-way cut-off structure for controlling the air flow interruption of the air flow channel. When the air pressure on the air inlet side is greater than the air pressure on the air outlet side, the one-way cut-off structure controls the air flow on the air inlet side to flow to the air outlet side through the air flow channel. A first air inlet hole (221) is formed on the valve housing (2) located on the air inlet side, and an air storage hole (211) and an air outlet hole (212) are formed on the valve housing (2) located on the air outlet side. The mass block (12) is located on the air outlet side and is aligned with the air outlet hole (212). The mass block (12) can cover the air outlet hole (212).

2. A low noise air leakage valve as claimed in claim 1, characterized in that: The air flow channel is a first air hole (111), and the one-way cutoff structure comprises an umbrella valve (13) or a fish-mouth valve (14) arranged on the diaphragm body (11); or, The one-way cut-off structure comprises a cylinder (16) which is in communication with the first air hole (111) and extends toward the air inlet side, and the outer end of the cylinder (16) abuts against the inner wall of the valve housing (2); or, The one-way cut-off structure comprises a first boss (223) arranged on the inner wall of the valve housing, wherein the first boss (223) is located on the air inlet side and extends toward the first air hole (111), and the outer end of the first boss (223) abuts against the diaphragm body (11) to close the first air hole (111).

3. A low noise air leakage valve as claimed in claim 1, characterized in that: The one-way cut-off structure comprises a cylindrical valve body (15) vertically arranged on the diaphragm body (11); the end of the cylindrical valve body (15) located on the air outlet side is provided with a closed limiting structure; the end of the cylindrical valve body (15) located on the air inlet side is open; and the air flow channel is a second air hole (151) arranged on the side wall of the cylindrical valve body (15).

4. A low noise air leakage valve as claimed in claim 1, characterized in that: A second air inlet hole (222) is provided on the valve housing (2) located on the air inlet side, the first air inlet hole (221) and the second air inlet hole (222) are separated from each other, the first air inlet hole (221) is arranged corresponding to the mass block (12), and the second air inlet hole (222) is arranged corresponding to the air flow channel.

5. A low noise air leakage valve as claimed in claim 4, characterized in that: The air flow channel is a first air hole (111), the one-way cutoff structure comprises a second boss (17) arranged on the diaphragm body (11) and having an end surface capable of covering the second air inlet hole (222), and the second boss (17) is arranged close to the first air hole (111); or, The one-way cut-off structure comprises an air inlet channel (224) connected to the second air inlet hole (222) and extending toward the diaphragm body (11), the outer end of the air inlet channel (224) abuts against the diaphragm body (11), and the first air hole (111) deviates from the air inlet channel (224).

6. A low noise air leakage valve as claimed in claim 4, characterized in that: The air flow channel includes a mounting hole (112) arranged on the diaphragm body (11); the one-way cut-off structure includes a distributed cantilever beam valve plate (18) installed in the mounting hole (112); the distributed cantilever beam valve plate (18) includes a valve plate body (181) and a cantilever (182); the valve plate body (181) is arranged in the mounting hole (112) through the cantilever (182); in an initial state, the valve plate body (181) covers the second air inlet hole (222).

7. A low noise air leakage valve as claimed in claim 1 or 4, characterized in that: The mass block (12) is columnar, and the mass block (12) is aligned with the center of the air outlet (212). When the mass block (12) covers the air outlet (212), the range of the closest distance D from the edge of the mass block (12) to the edge of the air outlet (212) is 0.1 mm≤D≤1 mm.

8. A low noise air leakage valve as claimed in any one of claims 1, 4 to 6, characterized in that: The diaphragm body (11) is an integral structure or a split structure.

9. A low noise air leakage valve as claimed in claim 2, characterized in that: The valve housing (2) comprises a first valve housing (21) and a second valve housing (22) which are sealed and connected to each other. The second valve housing (22) is located on the air inlet side of the diaphragm structure (1). When the one-way shut-off structure comprises an umbrella valve (13) or a fish-mouth valve (14), the second valve housing (22) is replaced by an air pressure generating device (5).

10. A low noise air leakage valve as claimed in claim 3, characterized in that: The valve housing (2) comprises a first valve housing (21) and a second valve housing (22) which cooperate with each other, the second valve housing (22) being located on the air inlet side of the diaphragm structure (1), and the second valve housing (22) being replaced by an air pressure generating device (5).

Images