Air leakage valve and fluid control device

Abstract

The utility model relates to the technical field of fluid control, in particular to an air leakage valve and a fluid control device, which comprises a supporting plate and a valve core component, the valve core component is provided with a guide plate, a middle plate, a valve plate and a bottom plate; according to the air leakage valve, the supporting plate, the flow guide plate, the middle plate, the valve plate and the bottom plate are all of a plate-shaped structure, the thinning degree of the air leakage valve is further improved, the thickness direction of the supporting plate is larger than that of the flow guide plate, the side, in the thickness direction, of the supporting plate is fixedly connected with the side, away from the middle plate, of the flow guide plate, and the valve plate is provided with a first deformation area and a second deformation area. Each layer of flat plate-shaped component can even be made of materials with the same or similar linear expansion coefficient, so that the problem of failure of the air leakage valve caused by poor temperature stability or temperature change is effectively solved; the flow path holes are arranged in a staggered and far-away manner, so that the sealing path is enlarged, the failure caused by poor sealing due to entry of foreign matters can be avoided, and the foreign matter interference resistance and the sealing reliability of the air leakage valve are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, and in particular to a leak valve and a fluid control device. Background Technology

[0002] The prior application CN115325213A discloses a side-venting leak valve, which is a leak valve assembled by flat-to-flat bonding of a cover plate and a stacked modular valve core. It has no independently set valve body or seat, thus eliminating the injection molding or complex machining processes required for valve bodies or seats in existing leak valve products. This facilitates the miniaturization and thinning of the leak valve. Furthermore, the modular valve core and cover plate are manufactured separately and then bonded together, which is beneficial for process control in mass production. The positive opening performance and reverse shut-off performance, key performance indicators of leak valves, can be tested and inspected without assembling into a complete leak valve product. Controlling the final product quality during the intermediate process helps further reduce the scrap rate and avoids the loss of raw materials in subsequent production processes based on scrap. This avoids waste of materials and labor; furthermore, the first air inlet is located at or near the center of the second flange, and the intermediate valve plate abuts against the rounded transition area between the first and second flanges. That is, the edge of the first air inlet does not directly contact the intermediate valve plate, avoiding the impact of dimensional deviations in the first air inlet during processing or the burrs formed on the edge of the inlet during processing on the fitting accuracy and sealing between the intermediate valve plate and the first air inlet, thereby improving the reverse shut-off performance of the intermediate valve plate and preventing leakage valve failure; during the venting process, the gas flows out through the second vent, which is set laterally. The second vent is sideways, so there is no need to consider avoiding the vent when installing external devices, and the mounting surface of the external gas storage device where the vent is located is flat, which facilitates the installation of the external gas storage device and improves the applicability of the product.

[0003] However, in practical engineering applications, the aforementioned lateral venting valve has also revealed some technical problems that urgently need to be overcome, mainly in the following aspects:

[0004] (1) The setting of the first flange and the second flange will inevitably make it difficult to achieve the maximum reduction in the overall thickness of the leakage valve, which is not conducive to further improving the product's thinness.

[0005] (2) The seal formed by the intermediate valve plate and the first flange and the second flange has a small sealing area. In addition, even if a silicone membrane with high elasticity is used, it has considerable rigidity after stretching, which makes the reverse shut-off of the intermediate valve not reach the expected level and has low tolerance for foreign objects.

[0006] (3) The modular valve core is composed of different material layers. In addition, in order to provide the pre-tightening force of the intermediate valve, the diaphragm is generally made of a membrane material with high elasticity, such as silicone membrane. However, due to the different materials of each layer, the coefficient of linear expansion is greatly different. When the temperature changes, the deformation part of the intermediate valve plate and the diaphragm will loosen or tighten, resulting in unstable function of the leaking valve or even failure.

[0007] (4) The modular valve core is composed of different material layers. The layers are usually bonded together with adhesive. However, adhesive bonding inevitably has the characteristics of creep aging. After a period of time, the intermediate valve plate and the deformed part of the diaphragm will loosen, causing the intermediate valve and the vent valve to fail, affecting the product stability and service life. Utility Model Content

[0008] The technical problem to be solved by this utility model is: in order to solve the problems of existing technologies such as difficulty in further improving the thinness and lightness, poor sealing of intermediate valves, low tolerance for foreign matter, poor stability, easy failure and short service life, a leakage valve and fluid control device are provided.

[0009] The technical solution adopted by this utility model to solve its technical problem is: a leaking valve, including a support plate and a valve core assembly, wherein the valve core assembly has a guide plate, an intermediate plate, a valve plate and a bottom plate that are stacked together in sequence along the thickness direction of the support plate to form an integral structure;

[0010] One side of the support plate in the thickness direction is fixedly connected to the side of the guide plate away from the middle plate, and a valve chamber and a vent chamber are formed between them. The valve chamber is connected to a vent hole, and the vent chamber is connected to an exhaust hole.

[0011] The guide plate has a guide port communicating with the valve cavity and a vent hole communicating with the vent cavity; the intermediate plate has a first opening opposite to the vent hole and a second opening opposite to the guide port, the first opening communicating with the vent cavity through the vent hole, and the second opening communicating with the valve cavity through the guide port; the valve plate has a first deformation zone and a second deformation zone, the second deformation zone having at least one flow path hole communicating with the second opening; the bottom plate has an air inlet and an air inlet hole, the air inlet and the first opening being opposite to each other across the first deformation zone, the air inlet hole and the second opening being opposite to each other across the second deformation zone, the air inlet hole and the flow path hole being completely misaligned, and the first opening communicating with the second opening;

[0012] When gas is introduced into the air inlet and air inlet, the first deformation zone deforms under the action of gas pressure difference and presses against the guide plate to block the vent hole. The second deformation zone deforms towards the guide plate under the action of gas pressure difference, so that the air inlet and the flow path hole are connected.

[0013] When gas is introduced into the vent, the first deformation zone releases the blockage of the vent under the action of the gas pressure difference, and the second deformation zone presses against the bottom plate under the action of the gas pressure difference, blocking the air inlet.

[0014] Furthermore, when gas is introduced into the vent, the first deformation zone deforms towards the side away from the guide plate under the action of the gas pressure difference, and the second deformation zone deforms towards the side away from the guide plate under the action of the gas pressure difference and presses against the bottom plate, blocking the air inlet.

[0015] Furthermore, the support plate has a first recess and a second recess on the side near the guide plate. The guide plate covers the first recess to form a valve chamber and covers the second recess to form a vent chamber. The guide port is positioned opposite the first recess and the vent is positioned opposite the second recess.

[0016] The support plate has a vent hole that connects to the valve chamber;

[0017] The support plate has an exhaust hole that communicates with the venting chamber; or, the second recess of the support plate has an extension groove that extends to the outer wall surface of the support plate, and the guide plate covers the extension groove to form the exhaust hole.

[0018] Furthermore, the valve plate is sandwiched between the intermediate plate and the bottom plate, with the side of the valve plate facing the intermediate plate engaging with the intermediate plate, and the side of the valve plate facing the bottom plate engaging with the area of ​​the bottom plate other than the area opposite to the second opening. The area of ​​the bottom plate near the valve plate located on the outer periphery of the air inlet opening is engaged with the valve plate, so that the first deformation area and the second deformation area of ​​the valve plate can deform under the action of gas pressure.

[0019] Furthermore, the intermediate plate is provided with a third opening that connects the first opening and the second opening.

[0020] Furthermore, the guide plate is provided with a flow passage hole, which is disposed opposite to the first opening. One side of the flow passage hole is connected to the valve cavity, and the other side is connected to the first opening, so that the first opening is connected to the second opening through the flow passage hole, the valve cavity, and the guide port.

[0021] Furthermore, the part of the bottom plate near the valve plate that is opposite to the second deformation zone is the air intake mating part. The air intake hole is provided in the air intake mating part. The air intake mating part has an air intake roughening area and an air intake sealing area. The roughness of the air intake roughening area is greater than the roughness of the air intake sealing area.

[0022] The air intake texturing area is wrapped around the outside of the air intake hole and located between the air intake hole and the air intake sealing area. When the second deformation area is pressed against the bottom plate, the air intake sealing area completely covers the flow path hole. The air intake sealing area is used to form a seal with the second deformation area.

[0023] Furthermore, the portion of the guide plate near the valve plate that is opposite to the first deformation zone is a venting mating part, and the venting hole is provided in the venting mating part. The venting mating part has a venting roughening area and a venting sealing area, and the roughness of the venting roughening area is greater than the roughness of the venting sealing area.

[0024] The vent sealing area surrounds the outside of the vent hole and forms a closed surrounding area, and is located between the vent hole and the vent texturing area. When the first deformation area is pressed against the guide plate, the vent sealing area and the first deformation area form a seal.

[0025] Furthermore, the support plate is composed of a single flat plate or at least two flat plates stacked together, and the guide plate, intermediate plate, valve plate and bottom plate are all flat plate components.

[0026] Furthermore, at least one of the support plate, guide plate, intermediate plate, valve plate, and bottom plate is made of a polymer material.

[0027] Furthermore, at least two of the support plate, guide plate, intermediate plate, valve plate, and bottom plate are made of polymer materials, and the valve plate and bottom plate are made of polymer materials.

[0028] Furthermore, at least the valve plate and the base plate have the same or similar coefficients of linear expansion.

[0029] Furthermore, the valve plate is laminated to the base plate via heat fusion.

[0030] Furthermore, at least the valve plate is laminated with the base plate without prestress.

[0031] This utility model also provides a fluid control device, including the above-mentioned leakage valve.

[0032] The beneficial effects of this utility model are:

[0033] 1) The leakage valve of this utility model does not have the valve body that forms multiple valve chambers on both sides of the diaphragm and the protruding structure that provides pre-tightening force to the diaphragm as in the prior art. The support plate and the guide plate, intermediate plate, valve plate and bottom plate that constitute the modular valve core assembly are all plate-shaped structures, which is conducive to further improving the thinness of the leakage valve.

[0034] 2) In the air leakage valve of this utility model, the flat plate components are joined together without prestress. The valve plate does not need to be made of a membrane material with high elasticity. The flat plate components can even be made of the same or similar material with the same or similar coefficient of linear expansion. This effectively solves the problem of poor temperature stability or failure caused by temperature changes that is common in air leakage valves in the prior art.

[0035] 3) The leakage valve of this utility model increases the sealing distance by staggering and distancing the flow path holes, which can avoid failure due to poor sealing caused by foreign objects entering, and greatly improves the leakage valve's resistance to foreign object interference and sealing reliability.

[0036] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Figure 1 This is a cross-sectional schematic diagram of the leakage valve in Example 1;

[0039] Figure 2 This is an explosion diagram of one side of the leakage valve in Example 1;

[0040] Figure 3 This is an explosion diagram of the other side of the leak valve in Example 1;

[0041] Figure 4 This is a schematic diagram of the air leakage valve being inflated in Example 1;

[0042] Figure 5 This is a schematic diagram of the vent valve venting air in Example 1;

[0043] Figure 6 This is a schematic diagram showing the roughening treatment of the venting mating part of the baffle.

[0044] Figure 7 This is a schematic diagram showing the roughening treatment of the air intake mating part of the bottom plate;

[0045] Figure 8 This is a cross-sectional schematic diagram of the leakage valve in Example 2;

[0046] Figure 9 This is an exploded schematic diagram of the leak valve in Example 2;

[0047] Figure 10 This is a cross-sectional schematic diagram of the leakage valve in Example 3;

[0048] Figure 11 This is an explosion diagram of the leak valve in Example 3;

[0049] Figure 12 This is an exploded schematic diagram of the leak valve in Example 4;

[0050] Figure 13 This is an exploded schematic diagram of the leak valve in Example 4;

[0051] Figure 14 This is a schematic diagram of a leak valve with a third opening and a flow passage.

[0052] In the figure: 1. Support plate, 11. Vent hole, 12. Exhaust hole, 13. First protrusion, 1-1. First recess, 1-2. Second recess, 1-3. Extension groove;

[0053] 2. Guide plate, 21. Vent hole, 22. Flow port, 23. Flow hole, 24. Vent mating part, 241. Vent texturing area, 242. Vent sealing area, 25. Second protrusion, 251. Reverse vent hole;

[0054] 3. Middle plate; 31. First opening; 32. Second opening; 33. Third opening;

[0055] 4. Valve plate; 41. First deformation zone; 42. Second deformation zone; 421. Flow path hole;

[0056] 5. Base plate; 51. Air intake opening; 52. Air intake hole; 53. Air intake mating part; 531. Air intake texturing area; 532. Air intake sealing area.

[0057] 6. Valve cavity;

[0058] 7. Vent chamber;

[0059] 8. Valve passage. Detailed Implementation

[0060] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0061] Example 1

[0062] like Figures 1-7As shown, a leak valve includes a support plate 1 and a modular valve core assembly with a stacked structure fixedly connected to the support plate 1. The two are assembled flat to flat to form a leak valve. The valve core assembly has a guide plate 2, an intermediate plate 3, a valve plate 4 and a bottom plate 5 that are stacked together in sequence along the thickness direction of the support plate 1 to form an integral structure.

[0063] One side of the support plate 1 in the thickness direction is fixedly connected to the side of the guide plate 2 opposite to the intermediate plate 3, forming a valve chamber 6 and a venting chamber 7 between them. The valve chamber 6 is connected to a vent hole 11, and the venting chamber 7 is connected to an exhaust hole 12. The support plate 1 has a first recess 1-1 and a second recess 1-2 on the side near the guide plate 2. The guide plate 2 covers the first recess 1-1 to form the valve chamber 6, and covers the second recess 1-2 to form the venting chamber 7. Figure 2-3 As shown;

[0064] The support plate 1 has a vent hole 11 that connects to the valve chamber 6;

[0065] The support plate 1 has an exhaust hole 12 that connects to the venting chamber 7;

[0066] In the valve core assembly:

[0067] The guide plate 2 has a guide port 22 communicating with the valve chamber 6 and a vent hole 21 communicating with the vent chamber 7. The guide port 22 is positioned opposite the first recess 1-1, and the vent hole 21 is positioned opposite the second recess 1-2. The intermediate plate 3 has a first opening 31 opposite to the vent hole 21 and a second opening 32 opposite to the guide port 22. The first opening 31 communicates with the vent chamber 7 through the vent hole 21, and the second opening 32 communicates with the valve chamber 6 through the guide port 22. The valve plate 4 has a first deformation zone 41 and a second deformation zone 42. The second deformation zone 42 is provided with at least one flow path hole 421, which is connected to the valve chamber 6 through the second opening 32 and the guide port 22; the bottom plate 5 is provided with an air inlet opening 51 and an air inlet hole 52, which are arranged opposite to the first opening 31 across the first deformation zone 41, and the air inlet hole 52 is arranged opposite to the second opening 32 across the second deformation zone 42. The air inlet hole 52 and the flow path hole 421 are completely misaligned, and the first opening 31 and the second opening 32 are connected.

[0068] When pressurized gas is blasted into the air inlet 51, the first deformation zone 41 deforms towards the guide plate 2 and presses against the guide plate 2, blocking the vent hole 21 provided on the guide plate 2; when pressurized gas is vented into the air vent 11 in the opposite direction, the first deformation zone 41 deforms towards the side away from the guide plate 2 and moves away from the guide plate 2, thereby releasing the blockage of the vent hole 21 provided on the guide plate 2.

[0069] The second deformation zone 42 is used to deform towards the guide plate 2 when pressurized gas is blown into the air inlet 52, forming a valve passage 8 that connects the air inlet 52, the flow path hole 421 and the valve cavity 6; when pressurized gas is introduced into the air vent 11 in the opposite direction, the second deformation zone 42 deforms towards the side away from the guide plate 2 and presses against the bottom plate 5, blocking the air inlet 52, thereby cutting off the valve passage 8 between the air inlet 52, the flow path hole 421 and the valve cavity 6.

[0070] That is, when gas is introduced into the air inlet 51 and the air inlet 52, the first deformation zone 41 deforms under the action of gas pressure difference and presses against the guide plate 2, blocking the vent 21. The second deformation zone 42 deforms towards the guide plate 2 under the action of gas pressure difference, so that a valve channel 8 is formed between the bottom plate 5 and the second deformation zone 42. The air inlet 52 is connected to the flow path hole 421 through the valve channel 8.

[0071] When gas is introduced into the vent 11, the first deformation zone 41 releases the blockage of the vent 21 under the action of the gas pressure difference, and the second deformation zone 42 presses against the bottom plate 5 under the action of the gas pressure difference, blocking the air inlet 52; furthermore, when gas is introduced into the vent 11, the first deformation zone 41 deforms towards the side away from the guide plate 2 under the action of the gas pressure difference to expand the space between the first deformation zone 41 and the guide plate 2, and the second deformation zone 42 deforms towards the side away from the guide plate 2 under the action of the gas pressure difference and presses against the bottom plate 5, blocking the air inlet 52;

[0072] To better understand the leakage valve in this embodiment, it will be further explained and described below. The direction facing the support plate 1 is defined as facing upward, and the modular valve core assembly is disposed on the lower surface of the support plate 1, but it is not limited thereto.

[0073] The support plate 1 has a first recess 1-1 and a second recess 1-2 spaced apart on one side. Specifically, a portion of the lower surface of the support plate 1 is recessed upward to form the first recess 1-1 and the second recess 1-2. The modular valve core assembly is installed on the lower surface of the support plate 1 and covers the first recess 1-1 in an integral form to form the valve cavity 6, and covers the second recess 1-2 to form the venting cavity 7.

[0074] A vent hole 11 is formed by extending downward through the upper surface of the support plate 1. Ideally, the vent hole 11 is located in the area of ​​the support plate 1 opposite to the first recess 1-1.

[0075] The upper surface of the support plate 1 extends downward to form an exhaust hole 12. Ideally, the exhaust hole 12 is located in the area of ​​the support plate 1 opposite to the second recess 1-2.

[0076] In this embodiment, the vent 12 is located in the area of ​​the support plate 1 opposite to the second recess 1-2. This allows the vent valve of this application to have the functions of positive inflation and positive venting along the thickness direction. Figures 1-3 As shown.

[0077] The support plate 1 can be rectangular, square, circular, or other shapes. In this embodiment, the support plate 1 is described as rectangular, but it is not limited thereto. The support plate 1 can be composed of a single plate or at least two plates stacked together. The material constituting the support plate 1 can be a metal material. For example, the first recess 1-1 and the second recess 1-2 can be formed by semi-etching or machining on the surface of the metal plate, and then the ventilation hole 11 and the exhaust hole 12 can be formed by etching, laser drilling, or machining. The material constituting the support plate 1 can also be a polymer film. For example, the necessary orifice features constituting the first recess 1-1 and the second recess 1-2 can be formed by laser cutting to remove material from at least one layer of polymer film, and then the at least one layer of polymer film without material removal is used to seal it, and then the ventilation hole 11 and the exhaust hole 12 are formed by laser drilling.

[0078] The vent 11 and the exhaust 12 can be round holes, oblong holes, square holes or other types, without any limitation. For example, the vent 11 and the exhaust 12 can even be a group of holes composed of multiple vents and exhaust ports respectively.

[0079] The modular valve core assembly includes a guide plate 2, an intermediate plate 3, a valve plate 4, and a bottom plate 5, which are stacked sequentially from the side closest to the support plate 1 to the side furthest from the support plate 1 to form an integral structure. That is, the guide plate 2, the intermediate plate 3, the valve plate 4, and the bottom plate 5 are stacked from top to bottom along the thickness direction.

[0080] The guide plate 2, intermediate plate 3, valve plate 4, and bottom plate 5 are all flat plate components, among which:

[0081] The guide plate 2 is provided with a vent hole 21 that connects to the vent chamber 7 and a guide port 22 that is provided relative to the first recess 1-1;

[0082] The intermediate plate 3 is provided with a first opening 31 opposite to the vent 21 and a second opening 32 opposite to the guide port 22;

[0083] The valve plate 4 is provided with at least one flow path hole 421, which is connected to the valve cavity 6 through the second opening 32 and the guide port 22;

[0084] The base plate 5 is provided with an air inlet opening 51 opposite to the first opening 31 and at least one air inlet hole 52 opposite to the second opening 32. The air inlet hole 52 is completely misaligned with the flow path hole 421.

[0085] Similarly, the shapes of the vent hole 21, flow path hole 421, and air inlet hole 52 described above can be round holes, oblong holes, square holes, or others. In this embodiment, a round hole is used as an example for explanation, but it is not limited thereto. The guide port 22, the first opening 31, the second opening 32, and the air inlet opening 51 can be round holes, oblong holes, or others. In this embodiment, an oblong hole opening is used as an example for explanation, but it is not limited thereto.

[0086] The valve plate 4 is sandwiched between the intermediate plate 3 and the bottom plate 5. The side of the valve plate 4 facing the intermediate plate 3 is engaged with the intermediate plate 3. The side of the valve plate 4 facing the bottom plate 5 is engaged with the area of ​​the bottom plate 5 other than the area opposite to the second opening 32. The area of ​​the bottom plate 5 near the valve plate 4 located on the outer periphery of the air inlet opening 51 is engaged with the valve plate 4, so that the first deformation area 41 and the second deformation area 42 of the valve plate 4 can be deformed under the action of gas pressure.

[0087] The first deformation zone 41 is defined by the first opening 31 and the air intake opening 51. It is easy to understand that when the first opening 31 is larger than the air intake opening 51, and when viewed along the thickness direction, the first opening 31 completely covers the air intake opening 51, then the first deformation zone 41 is the area of ​​the valve plate 4 opposite to the air intake opening 51; when the first opening 31 is smaller than the air intake opening 51, and when viewed along the thickness direction, the first opening 31 is completely covered by the air intake opening 51, then the first deformation zone 41 is the area of ​​the valve plate 4 opposite to the first opening 31.

[0088] The second deformation zone 42 is defined by the second opening 32, that is, the area of ​​the valve plate 4 opposite to the second opening 32 is formed as the second deformation zone 42.

[0089] The valve chamber 6, the guide port 22 and the second opening 32 are arranged opposite to each other. When viewed along the thickness direction, the three have overlapping opposite areas, thus providing sufficient deformation space for the first deformation zone 41 to deform towards the guide plate 2.

[0090] The first opening 31 and the second opening 32 are connected on the intermediate plate 3. In this embodiment, the intermediate plate 3 is also provided with a third opening 33, which is connected to the first opening 31 and the second opening 32. Thus, when airflow is introduced into the vent hole 11, the airflow in the valve chamber 6 needs to pass through the second deformation zone 42 before reaching the third opening 33, and then flow from the third opening 33 to the first opening 31, and then flow from the vent hole 21 to the vent chamber 7, and finally be discharged from the exhaust hole 12.

[0091] The leak valve of this application is typically used in conjunction with a miniature piezoelectric pump to form a modular component capable of rapid inflation and deflation. It is primarily applied to electronic devices with blood pressure measurement functions, such as wrist blood pressure monitors, smartwatches, and smart bracelets, but is not limited thereto. Any device, apparatus, or instrument that requires filling an air reservoir (such as an air bag or cuff) with compressed air and expelling air from the air reservoir can utilize the leak valve of this application. The following description illustrates the operation of the leak valve of this application using a rapid inflation and deflation module constructed by combining the leak valve of this application with a miniature piezoelectric pump.

[0092] The miniature piezoelectric pump is stacked and joined to the side of the modular valve core assembly opposite to the support plate 1. The air storage section is joined to the side of the support plate 1 opposite to the modular valve core assembly. The air inlet 51 and the air inlet 52 are connected to the pressurized gas outlet of the miniature piezoelectric pump.

[0093] During inflation, a miniature pneumatic pump (not shown in the figure) starts working, generating compressed gas with a certain pressure. The compressed gas acts on the first deformation zone 41 of the valve plate 4 through the air inlet 51, creating a pressure difference on both sides of the first deformation zone 41. Under the action of the gas pressure difference, the first deformation zone 41 deforms towards the guide plate 2 and presses against the guide plate 2, blocking the vent hole 21 on the guide plate 2. At the same time, gas of the same pressure acts on the second deformation zone 42 of the valve plate 4 through the air inlet 52, creating a pressure difference on both sides of the second deformation zone 42. Under the influence of the gas pressure difference, the deformation zone 42 deforms towards the guide plate 2. As a result, the area opposite to the second deformation zone 42 on the surface of the base plate 5 near the valve plate 4, and the gap between the second deformation zone 42, form a valve channel 8. This allows the air inlet 52 on the base plate 5 to connect with the flow path 421 on the valve plate 4, thus forming a connecting path between the air inlet 52, the flow path 421, and the valve chamber 6. Pressurized gas enters the valve chamber 6 through this connecting path and then flows into the air storage section (not shown in the figure) through the vent 11, completing the inflation cycle. Figure 4 As shown.

[0094] During degassing, the miniature piezoelectric pump stops working, and the residual pressurized gas between the miniature piezoelectric pump and the modular valve core assembly is quickly leaked out in the reverse direction through the miniature piezoelectric pump to restore normal pressure. Meanwhile, the pressurized gas stored in the air storage section during the previous inflation stroke flows in the reverse direction through the vent 11 and enters the valve chamber 6. Since the valve chamber 6, the guide port 22, the first opening 31, and the second opening 32 are interconnected, a pressure difference is formed on both sides of the first deformation zone 41 and the second deformation zone 42 of the valve plate 4. Under the action of the gas pressure difference, the second deformation zone 42 moves away from the pressure range. One side of the guide plate 2 deforms and presses against the base plate 5, blocking the air inlet 52 on the base plate 5. The valve passage 8 closes, thereby cutting off the communication path between the air inlet 52, the flow path 421, and the valve chamber 6. At the same time, the first deformation zone 41 deforms away from the guide plate 2 under the action of the gas pressure difference, thereby releasing the blockage of the vent 21. The pressurized gas can then pass through the valve chamber 6, the guide port 22, the second opening 32, the third opening 33, the first opening 31, the vent 21, and the vent chamber 7, and finally be discharged through the exhaust port 12. Figure 5 As shown.

[0095] During the process of the first deformation zone 41 deforming towards the guide plate 2 to block the vent hole 21 under the action of the gas pressure difference on both sides, or deforming towards the side away from the guide plate 2 to release the blockage of the vent hole 21, it is necessary to ensure both rapid and timely response and good sealing. Ideally, the outer circumferential area of ​​the guide plate 2's surface facing the valve plate 4, adjacent to the vent hole 21, should be roughened to increase the roughness of this area. This makes it easier for the first deformation zone 41 of the valve plate 4 to separate from the guide plate 2 under gas pressure during the exhaust stroke, thus releasing the blockage of the vent hole 21. Of course, the outer circumferential roughened area of ​​the guide plate 2 adjacent to the vent hole 21 should not exceed the area of ​​the guide plate 2 opposite to the first deformation zone 41, so that during the inflation stroke, the area adjacent to the vent hole 21 can always be pressed against the first deformation zone 41 to form a good seal. Figure 6 As shown;

[0096] For example, the part of the surface of the guide plate 2 near the valve plate 4 that is opposite to the first deformation area 41 is the vent fitting part 24. The vent hole 21 is provided in the vent fitting part 24. The vent fitting part 24 has a vent roughening area 241 and a vent sealing area 242. The roughness of the vent roughening area 241 is greater than the roughness of the vent sealing area 242.

[0097] The vent sealing area 242 surrounds the outside of the vent hole 21 and forms a closed surrounding area. The vent sealing area 242 is located between the vent hole 21 and the vent texturing area 241. When the first deformation area 41 is pressed against the guide plate 2, the vent sealing area 242 and the first deformation area 41 form a seal.

[0098] The venting roughening zone 241 is roughened to make it rougher, facilitating separation from the guide plate 2 and relieving the blockage of the venting hole 21. The venting sealing zone 242 is smoother, allowing it to fit more tightly against the first deformation zone 41, forming a good seal. It is easy to understand that the venting sealing zone 242 surrounding the venting hole 21 must form a closed surrounding area to achieve a reliable seal, while the venting roughening zone 241, located further out of the venting sealing zone 242, does not need to form a closed surrounding area to achieve easy separation from the guide plate 2.

[0099] Similarly, during the process of the second deformation zone 42 deforming towards the side away from the guide plate 2 to block the air inlet 52 or deforming towards the side of the guide plate 2 to release the blockage of the air inlet 52 under the action of the gas pressure difference on both sides, it is necessary to ensure both rapid and timely response and good sealing. Ideally, the area of ​​the bottom plate 5 adjacent to the air inlet 5 on the side of the valve plate 4 facing the bottom plate 5 should be roughened to increase the roughness of the area. This makes it easier for the second deformation zone 42 of the valve plate 4 to separate from the bottom plate 5 under the action of gas pressure during the inflation stroke, thus releasing the blockage of the air inlet 52. Of course, the roughened area of ​​the bottom plate 5 adjacent to the air inlet 52 should not exceed the area of ​​the bottom plate 5 opposite to the second deformation zone 42, so that during the exhaust stroke, the outer periphery of the roughened area of ​​the air inlet 52 can always be pressed against the second deformation zone 42 to form a good seal. Figure 7 As shown.

[0100] The part of the bottom plate 5 near the valve plate 4 opposite to the second deformation area 42 is the air intake mating part 53. The air intake hole 52 is provided in the air intake mating part 53. The air intake mating part 53 has an air intake roughening area 531 and an air intake sealing area 532. The roughness of the air intake roughening area 531 is greater than the roughness of the air intake sealing area 532.

[0101] The intake texturing area 531 is wrapped around the outside of the intake hole 52 and is located between the intake hole 52 and the intake sealing area 532. When the second deformation area 42 is pressed against the bottom plate 5, the intake sealing area 532 completely covers the flow path hole 421, and the intake sealing area 532 and the second deformation area 42 form a seal.

[0102] The intake roughening zone 531 is roughened to make it rougher, facilitating separation from the base plate 5 and relieving the blockage of the intake port 52. The intake sealing zone 532 is smoother, allowing it to fit more tightly against the second deformation zone 42, forming a good seal. It is easy to understand that the intake sealing zone 532 surrounding the intake port 52 must form a closed surrounding area to achieve a reliable seal, while the intake roughening zone 531 located between the intake port 52 and the intake sealing zone 532 does not need to form a closed surrounding area to achieve easy separation from the base plate 5.

[0103] In addition, at least one of the support plate 1, guide plate 2, intermediate plate 3, valve plate 4, and bottom plate 5 is made of a polymer material. Alternatively, the support plate 1, guide plate 2, intermediate plate 3, valve plate 4, and bottom plate 5 can all be made of polymer materials, such as one or more of polyester polymers, polyether polymers, polyurethane polymers, and polycarbonate polymers, but this is not a limitation. Polymer materials are lightweight, which is beneficial for the lightweight design of the leak valve. They are also readily available and low in cost. More importantly, the interlayer bonding process for polymer materials is relatively mature, making it easier to achieve adhesive-free bonding. For example, layers can be joined together by thermal fusion, such as ultrasonic thermal fusion or high-frequency electromagnetic wave thermal fusion, but this is not a limitation either. It should also be noted that the fusion process may involve the placement of a transition layer or coating between layers, but this does not constitute a limitation of this invention. This avoids the problem of leak valve failure caused by long-term adhesive creep aging when using adhesives for interlayer bonding in existing technologies. Ideally, at least the valve plate 4 and the base plate 5 should be made of polymer materials. Even more ideally, at least the valve plate 4 and the base plate 5 should be made of the same or similar polymer materials; even more ideally, the guide plate 2, the intermediate plate 3, the valve plate 4, and the base plate 5 should all be made of the same or similar materials. This is because the valve plate 4 is joined to the base plate 5 on one side, and the second deformation area 42 of the valve plate 4 cooperates with the air inlet 52 on the base plate 5 to form the check valve / intermediate valve in the leak valve. The valve plate 4 is also joined to the guide plate 2 on one side, and the first deformation area 41 of the valve plate 4 cooperates with the vent 21 on the guide plate 2 to form the exhaust valve / vent valve in the leak valve. These are the main functional units of the leak valve, and failure of either one will cause the leak valve to fail, especially the check valve / intermediate valve. Since at least the valve plate 4 and the base plate 5 should be made of the same or similar polymer materials, such as polyester membrane materials, and after they are joined together by heat fusion without adhesive, the shape of the valve plate 4 is basically fixed. It is not affected by environmental factors (such as temperature and humidity), thus ensuring the long-term functional stability of the check valve / intermediate valve.

[0104] Furthermore, ideally, the flow path hole 421 on the valve plate 4 and the air inlet hole 52 on the base plate 5 should be positioned as far apart as possible along the in-plane direction in the area opposite to the second deformation zone 42, while ensuring they are completely staggered. This ensures that even if foreign objects (such as lint or dust) enter the flow path hole 421, it will not hinder the effective sealing of the air inlet hole 52 by the second deformation zone 42 during the exhaust stroke. Figures 1-3 As shown.

[0105] Therefore, compared with the prior art, the leak valve of this utility model has flat plate components, including the support plate 1 and the guide plate 2, intermediate plate 3, valve plate 4, and bottom plate 5 that constitute the modular valve core assembly. It does not have the valve body that forms multiple valve chambers on both sides of the diaphragm, nor the protruding structure that provides pre-tightening force to the diaphragm, as is present in the prior art. This facilitates further thinning of the leak valve. Furthermore, since the flat plate components are joined without pre-stress, the valve plate 4 does not need to be made of a membrane material with high elasticity. The flat plate components can even be made of the same or similar type with the same or similar coefficient of linear expansion (coefficient of linear expansion of...). Materials with a difference of less than 10% do not have the problems of poor temperature stability or failure due to temperature changes found in the prior art. For example, the materials constituting the valve plate 4 and the base plate 5 can both be polyethylene terephthalate (PET) film, or the material constituting the valve plate 4 can be polyethylene naphthalate (PEN) film, while the material constituting the base plate 5 can be polyethylene terephthalate (PET) film. Furthermore, by staggering and distancing the flow path holes 421, this utility model can avoid failure due to poor sealing caused by foreign objects entering, and greatly improve the air leakage valve's resistance to foreign object interference.

[0106] Example 2

[0107] like Figures 8-9 As shown, the difference between this embodiment and embodiment 1 is that: the second recess 1-2 of the support plate 1 has an extension groove 1-3 extending to the outer wall surface of the support plate 1, and the outer wall surface of the support plate 1 refers to the four sides between the two surfaces of the support plate 1 in the thickness direction; the guide plate 2 covers the extension groove 1-3 to form an exhaust hole 12, that is, the valve core assembly covers the second recess 1-2 and the extension groove 1-3 to form a venting chamber 7 and an exhaust hole 12, and the exhaust hole 12 connects to the venting chamber 7, so that the leakage valve of this embodiment has the function of charging in the forward direction along the thickness direction and venting laterally in the plane direction perpendicular to the thickness direction.

[0108] Example 3

[0109] like Figures 10-11 As shown, the difference between this embodiment and Embodiment 2 is that the support plate 1 has a first protrusion 13 protruding in the plane direction perpendicular to the thickness direction, and the extension groove 1-3 extends to the first protrusion 13. In this structure, ideally, the guide plate 2 has a second protrusion 25 protruding in the plane direction perpendicular to the thickness direction. The second protrusion 25 is directly opposite to the first protrusion 13. The second protrusion 25 is also provided with a through reverse vent hole 251, which connects to the venting chamber 7. During the exhaust stroke, the gas is finally discharged through the reverse vent hole 251, so that the leakage valve of this utility model has the function of inflating in the forward direction along the thickness direction and venting in the opposite direction along the thickness direction.

[0110] Example 4

[0111] like Figures 12-13 As shown, the difference between this embodiment and embodiments 1 to 3 is that: the guide plate 2 is provided with a flow hole 23, which is arranged opposite to the first opening 31. One side of the flow hole 23 communicates with the valve chamber 6, and the other side communicates with the first opening 31, so that the first opening 31 communicates with the second opening 32 through the flow hole 23, the valve chamber 6, and the guide port 22; Figure 14 As shown, a third opening 33 and a flow passage 23 can also be provided simultaneously.

[0112] During the venting stroke, the pressurized gas flowing into the valve chamber 6 from the vent 11 is divided into two paths. One path passes through the guide port 22 and the second opening 32 and acts on the second deformation zone 42. Under the action of the gas pressure difference on both sides, the second deformation zone 42 deforms towards the side away from the guide plate 2 and presses against the bottom plate 5, blocking the air inlet 52 on the bottom plate 5, thereby cutting off the valve passage 8 between the air inlet 52, the flow path hole 421 and the valve chamber 6. The other path passes through the flow hole 23 and the first opening 31 and acts on the first deformation zone 41. Under the action of the gas pressure difference on both sides, the first deformation zone 41 deforms towards the side away from the guide plate 2, thereby releasing the blockage of the vent 21 and allowing the pressurized gas to be discharged through the vent 21.

[0113] Example 5

[0114] A fluid control device is provided, comprising a leak valve according to any of the above embodiments. The fluid control device further includes a pump assembly, such as the miniature piezoelectric pump of the embodiments of this application. The combination of the miniature piezoelectric pump and the leak valve enables the fluid control device to have inflation and deflation functions, and it can be widely used in electronic devices with blood pressure measurement functions such as wrist blood pressure monitors, smartwatches, and smart bracelets, but is not limited thereto.

[0115] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A leak valve, characterized in that: It includes a support plate and a valve core assembly, wherein the valve core assembly has a guide plate, an intermediate plate, a valve plate and a bottom plate that are stacked together sequentially along the thickness direction of the support plate to form an integral structure; One side of the support plate in the thickness direction is fixedly connected to the side of the guide plate away from the middle plate, and a valve chamber and a vent chamber are formed between them. The valve chamber is connected to a vent hole, and the vent chamber is connected to an exhaust hole. The guide plate has a guide port communicating with the valve cavity and a vent hole communicating with the vent cavity; the intermediate plate has a first opening opposite to the vent hole and a second opening opposite to the guide port, the first opening communicating with the vent cavity through the vent hole, and the second opening communicating with the valve cavity through the guide port; the valve plate has a first deformation zone and a second deformation zone, the second deformation zone having at least one flow path hole communicating with the second opening; the bottom plate has an air inlet and an air inlet hole, the air inlet and the first opening being opposite to each other across the first deformation zone, the air inlet hole and the second opening being opposite to each other across the second deformation zone, the air inlet hole and the flow path hole being completely misaligned, and the first opening communicating with the second opening; When gas is introduced into the air inlet and air inlet, the first deformation zone deforms under the action of gas pressure difference and presses against the guide plate to block the vent hole. The second deformation zone deforms towards the guide plate under the action of gas pressure difference, so that the air inlet and the flow path hole are connected. When gas is introduced into the vent, the first deformation zone releases the blockage of the vent under the action of the gas pressure difference, and the second deformation zone presses against the bottom plate under the action of the gas pressure difference, blocking the air inlet.

2. The leakage valve according to claim 1, characterized in that: When gas is introduced into the vent, the first deformation zone deforms towards the side away from the guide plate under the action of the gas pressure difference, and the second deformation zone deforms towards the side away from the guide plate under the action of the gas pressure difference and presses against the bottom plate, blocking the air inlet.

3. The leakage valve according to claim 1, characterized in that: The support plate has a first recess and a second recess on the side near the guide plate. The guide plate covers the first recess to form a valve chamber and covers the second recess to form a vent chamber. The guide port is positioned opposite the first recess and the vent is positioned opposite the second recess. The support plate has a vent hole that connects to the valve chamber; The support plate has an exhaust hole that communicates with the venting chamber; or, the second recess of the support plate has an extension groove that extends to the outer wall surface of the support plate, and the guide plate covers the extension groove to form the exhaust hole.

4. The leakage valve according to claim 1, characterized in that: The valve plate is sandwiched between the intermediate plate and the bottom plate. The side of the valve plate facing the intermediate plate is engaged with the intermediate plate, and the side of the valve plate facing the bottom plate is engaged with the area of ​​the bottom plate other than the area opposite to the second opening. The area of ​​the bottom plate near the valve plate located on the outer periphery of the air inlet opening is engaged with the valve plate, so that the first deformation area and the second deformation area of ​​the valve plate can deform under the action of gas pressure.

5. The leakage valve according to claim 1, characterized in that: The intermediate plate is provided with a third opening that connects the first opening and the second opening.

6. The leakage valve according to claim 1, characterized in that: The guide plate is provided with a flow passage hole, which is arranged opposite to the first opening. One side of the flow passage hole is connected to the valve cavity, and the other side is connected to the first opening, so that the first opening is connected to the second opening through the flow passage hole, the valve cavity and the guide port.

7. The leakage valve according to any one of claims 1-6, characterized in that: The part of the bottom plate near the valve plate that is opposite to the second deformation zone is the air intake mating part. The air intake hole is provided in the air intake mating part. The air intake mating part has an air intake roughening area and an air intake sealing area. The roughness of the air intake roughening area is greater than the roughness of the air intake sealing area. The air intake texturing area is wrapped around the outside of the air intake hole and located between the air intake hole and the air intake sealing area. When the second deformation area is pressed against the bottom plate, the air intake sealing area completely covers the flow path hole. The air intake sealing area is used to form a seal with the second deformation area.

8. The leakage valve according to any one of claims 1-6, characterized in that: The portion of the guide plate near the valve plate that is opposite to the first deformation zone is a venting mating part. The venting hole is provided in the venting mating part. The venting mating part has a venting roughening area and a venting sealing area. The roughness of the venting roughening area is greater than the roughness of the venting sealing area. The vent sealing area surrounds the outside of the vent hole and forms a closed surrounding area, and is located between the vent hole and the vent texturing area. When the first deformation area is pressed against the guide plate, the vent sealing area and the first deformation area form a seal.

9. The leakage valve according to any one of claims 1-6, characterized in that: The support plate is composed of a single flat plate or at least two stacked flat plates, and the guide plate, intermediate plate, valve plate and bottom plate are all flat plate components.

10. The leakage valve according to any one of claims 1-6, characterized in that: At least one of the support plate, guide plate, intermediate plate, valve plate and bottom plate is made of polymer material.

11. The leakage valve according to claim 10, characterized in that: At least two of the support plate, guide plate, intermediate plate, valve plate and bottom plate are made of polymer materials, and the valve plate and bottom plate are made of polymer materials.

12. The leakage valve according to claim 11, characterized in that: At least the valve plate and the base plate have the same or similar coefficients of linear expansion.

13. The leakage valve according to claim 11, characterized in that: At least the valve plate is laminated to the base plate by heat fusion.

14. The leakage valve according to claim 11, characterized in that: At least the valve plate is laminated with the base plate without prestress.

15. A fluid control device, characterized in that: Including the leak valve as described in any one of claims 1-14.

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