A diaphragm valve

Abstract

The utility model provides a diaphragm valve, include: manifold block have valve cavity and flow channel, valve cavity one end is set to first opening part, valve core subassembly, including valve core part, deformation part and first sealing part, first casing, with manifold block links to each other, and will first sealing part sealed pressure joint on manifold block, this diaphragm valve still include: buffer diaphragm, with first casing sealed joint, and be located valve core part far away from one side of manifold block, gas chamber, form between first casing and buffer diaphragm, and be provided with gas port on first casing, this gas port is used to change the gas pressure in gas chamber, buffer diaphragm can respond to the gas pressure change in gas chamber, to the valve core part transmission towards valve cavity's acting force, wherein, buffer diaphragm and deformation part form with two completely separate separation gap, to when buffer diaphragm is under the pressure in gas chamber, separation gap is used to provide the space of buffer diaphragm deformation, has the advantage that avoids the excessive deformation of deformation part.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and in particular to a diaphragm valve. Background Technology

[0002] In industries such as semiconductors and biopharmaceuticals, high purity of liquids is required. To prevent contamination of the liquid by the valve body as it passes through, diaphragm valves are often used. Diaphragm valves have a diaphragm structure that separates the flow path from the non-flow path, ensuring that the liquid only comes into contact with the flow path block and the diaphragm structure as it passes through the valve body, thus guaranteeing the cleanliness of the liquid.

[0003] A pneumatic diaphragm valve is a valve that uses a gas chamber on the side of the diaphragm structure away from the flow path block. By filling and releasing the gas chamber, the movement of the diaphragm structure can be controlled, thereby changing the state of the fluid within the flow path block.

[0004] However, when the gas chamber is first filled, a large amount of compressed gas rapidly enters the lower-pressure gas chamber from a higher-pressure gas source, causing a sharp change in gas velocity and forming a transient pressure shock wave that impacts the diaphragm. At this time, the diaphragm is prone to plastic deformation or even rupture due to excessive local forces caused by the impact. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the defects in the prior art, thereby providing a diaphragm valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A diaphragm valve, comprising:

[0008] The manifold block has a valve chamber and a flow channel, wherein the valve chamber and the flow channel are connected, and one end of the valve chamber is configured as a first opening.

[0009] A valve core assembly includes a valve core portion, a deformable portion connected to the outer edge of the valve core portion, and a first sealing portion connected to the outer edge of the deformable portion; the thickness of the deformable portion is less than the thickness of the valve core portion, and the valve core portion can reciprocate relative to the first sealing portion through the deformation of the deformable portion, thereby changing the state of the fluid in the valve cavity;

[0010] A first housing is connected to the manifold block and presses the first sealing part onto the manifold block to achieve the sealing of the first opening of the valve cavity by the valve core assembly;

[0011] The diaphragm valve also includes:

[0012] A buffer diaphragm is sealed to the first housing. The buffer diaphragm is located on the side of the valve core away from the manifold block and can be connected to the valve core.

[0013] A gas chamber is formed between a first housing and a buffer diaphragm, and an air port is provided on the first housing. The air port is used to change the gas pressure in the gas chamber. The buffer diaphragm can respond to the change in gas pressure in the gas chamber to transmit a force toward the valve core.

[0014] The buffer diaphragm and the deformable part are separated by a gap that completely separates them, so that when the buffer diaphragm is subjected to pressure in the gas chamber, the gap provides space for the buffer diaphragm to deform.

[0015] In the above solution, a buffer diaphragm is provided between the first housing and the valve core, and the buffer diaphragm is sealed to the first housing to form a gas chamber. When gas is introduced into the gas chamber through the gas port to increase the gas pressure inside the gas chamber, the gas will first impact the buffer diaphragm. The buffer diaphragm then transmits the force to the valve core through its connection with the valve core. This avoids the gas directly impacting the valve core assembly, thus preventing the structure at the deformation part from being easily damaged by the impact.

[0016] Simultaneously, the formation of the gap allows the buffer diaphragm to have a certain deformable space when it deforms towards the valve core assembly under the action of gas impact force. This ensures that when the buffer diaphragm deforms due to gas impact force, it deforms towards the deformation part, and its own deformation initially buffers the impact force. This prevents the buffer diaphragm from initially adhering to the deformation part, which would cause the initial force to be transmitted to the deformation part, making it prone to damage.

[0017] By setting a buffer diaphragm between the first housing and the valve core assembly, and forming a separation gap between the buffer diaphragm and the deformable part, it is possible to apply a force toward the valve cavity to the valve core to cooperate with other forces on the valve core and achieve control of the valve core; at the same time, it is possible to avoid excessive deformation of the deformable part caused by gas impact on the deformable part of the valve core assembly.

[0018] It is worth noting that the "complete separation" mentioned above means that there is no contact between the end face of the buffer diaphragm facing the deformation part and the end face of the deformation part. In other words, the points on the end face of the buffer diaphragm and the points on the end face of the deformation part will not coincide.

[0019] Preferably, the buffer diaphragm includes a second sealing portion, which is disposed in sealing contact with the first sealing portion to form a sealed chamber between the valve core assembly and the buffer diaphragm.

[0020] In the above solution, by forming a sealed chamber between the buffer diaphragm and the valve core assembly, the pressure difference between the two end faces of the buffer diaphragm and the deformation part can be balanced, preventing excessive deformation of the buffer diaphragm and the deformation part due to the pressure difference. Specifically, when gas is filled into the gas chamber, its internal pressure increases, causing the buffer diaphragm to deform towards the deformation part, which in turn reduces the volume of the sealed chamber and increases the pressure. During use, the pressure in both the gas chamber and the valve chamber is relatively high. By increasing the pressure in the sealed chamber as described above, the pressure difference between the buffer diaphragm and the deformation part can be reduced, ensuring that neither of them deforms excessively due to an excessive pressure difference. It should be noted that the sealed chamber is formed between the buffer diaphragm and the valve core assembly, and it is sealed internally by the contact between the second sealing part and the first sealing part. If the buffer diaphragm is completely attached to the top of the valve core and will not separate, the sealing chamber is the aforementioned separation gap; however, if there may be a gap or separation between the buffer diaphragm and the top of the valve core, the sealing chamber includes both the separation gap and the gap between the buffer diaphragm and the top of the valve core.

[0021] Preferably, the second sealing portion has an extension that extends integrally upward, and the first housing is provided with an annular protrusion located inside the extension and restricting the radial inward movement of the extension.

[0022] In the above scheme, the annular protrusion and the extension cooperate with each other to achieve radial limiting of the second sealing part, so as to avoid the second sealing part moving inward due to the force on the buffer diaphragm, which would affect the sealing effect of the buffer diaphragm and the first housing.

[0023] Preferably, the first housing and the outer wall of the annular protrusion form an annular groove, the elastic modulus of the extension is less than the elastic modulus of the first sealing part, the extension is axially interference-fitted into the inside of the annular groove, and is sealed and fitted with the inner wall of the annular groove.

[0024] In the above solution, the cooperation between the extension and the annular groove can, on the one hand, further improve the sealing effect between the buffer diaphragm and the first housing; on the other hand, the compression of the extension gives it greater elasticity, ensuring that when the first sealing part creeps, the deformation of the extension ensures a tight abutment between the second sealing part and the first sealing part, and that the first sealing part has sufficient force to abut against the manifold block to seal the first opening. Furthermore, the annular groove can limit excessive radial deformation of the extension and prevent bending of the extension.

[0025] Preferably, the area of ​​the buffer diaphragm is larger than the area of ​​the deformed portion;

[0026] The buffer diaphragm is a disc-shaped structure; or, the buffer diaphragm is an annular structure, and the inner side of the buffer diaphragm is fixedly connected to the valve core.

[0027] In the above scheme, by setting the area of ​​the buffer diaphragm to be larger, the maximum deformation of the buffer diaphragm can be greater, thereby making it less likely for the buffer diaphragm to reach the deformation limit position, thus ensuring that the buffer diaphragm is not prone to plastic deformation due to excessive deformation, and thus ensuring that the buffer diaphragm is not easily damaged.

[0028] Furthermore, when the buffer diaphragm has a disc-shaped structure, it only seals at the outer edge, with no connection points within the sealed area (i.e., the area aligned with the gas chamber). This allows the initial deformation of the buffer diaphragm to cause the rest of the diaphragm to deform along with it, thus preventing stress concentration when the diaphragm is subjected to impact and avoiding damage caused by exceeding its deformation limit locally. When the buffer diaphragm is set into a ring-shaped structure and fixedly connected to the valve core, a certain force can be directly applied to the valve core through changes in gas pressure, improving the response rate of the valve core.

[0029] Preferably, the deformable part is connected to the outer wall of the valve core, and the connection is located at the end of the outer wall of the valve core away from the buffer diaphragm;

[0030] The thickness of the first sealing part is greater than the thickness of the deformable part. The outer side of the deformable part is connected to the inner wall of the first sealing part, and the connection point is located at the end of the inner wall of the first sealing part away from the buffer diaphragm.

[0031] In the above scheme, the connection position between the deformation part and the valve core and the first sealing part ensures a relatively large gap between the deformation part and the buffer diaphragm. This ensures that the buffer diaphragm has a relatively large deformation space when subjected to the pressure of the gas chamber, allowing it to disperse the gas impact force and stress caused by the gas pressure through its own deformation. Simultaneously, when the buffer diaphragm abuts against the valve core and the first sealing part, it does not directly contact the deformation part, but maintains a certain gap. This prevents the buffer diaphragm from directly contacting the deformation part and causing it to deform after slight deformation under stress.

[0032] Preferably, a limiting protrusion is provided on the end face of the gas chamber away from the buffer diaphragm, and a groove is formed on the periphery of the limiting protrusion;

[0033] The air vent is formed on the groove wall surface.

[0034] In the above scheme, by setting the limiting protrusion, when the buffer diaphragm moves or deforms towards the gas chamber side under the thrust of the valve core assembly, the buffer diaphragm will first abut against the limiting protrusion, so that the limiting protrusion can further restrict the movement of the buffer diaphragm to abut against the inner wall of the groove, thereby preventing the gas port from being blocked and affecting the gas supply to the gas chamber.

[0035] Preferably, the buffer diaphragm is an elastic diaphragm, which can elastically deform to contact the deformed part when subjected to gas in the gas chamber.

[0036] In the above scheme, by setting the buffer diaphragm as an elastic diaphragm, when gas impacts the buffer diaphragm, the diaphragm can buffer the impact stress through its own elastic deformation, avoiding excessive local stress and damage to the annular diaphragm. When the impact force is too large, the buffer diaphragm can elastically deform to contact the deformed part, so that the impact force is simultaneously distributed to the buffer diaphragm and the deformed part, thereby avoiding excessive force on the buffer diaphragm and damage. At the same time, when the impact force decreases, the buffer diaphragm can also recover its deformation and separate from the deformed part.

[0037] Preferably, a second opening is provided on the side of the valve cavity away from the first opening, and a second housing is fixedly connected to the manifold block on this side. A sealing diaphragm for sealing the second opening is provided between the second housing and the manifold block. A pressure-applying component is provided between the sealing diaphragm and the second housing. A valve seat portion is provided inside the manifold block to divide the valve cavity into two parts. One of the sealing diaphragm and the valve core portion passes through the valve seat portion and can cooperate with the valve seat portion. The sealing diaphragm is fixed or abuts against the valve core portion.

[0038] In this design, the force exerted by the pressure-applying component on the sealing diaphragm, the force exerted by the gas chamber on the valve core assembly via the buffer diaphragm, and the force exerted by the fluid pressure within the manifold block on the valve core and sealing diaphragm collectively control the movement of the valve core and sealing diaphragm, thereby changing the opening size of the valve seat. In this scheme, the diaphragm valve is used as a pressure-regulating valve. By changing the size of the valve seat opening when the pressure within the valve chamber changes, the fluid pressure in the latter half of the valve chamber can be altered, thus stabilizing the fluid pressure in the latter half of the valve chamber.

[0039] Preferably, the flow channel includes an inlet flow channel and an outlet flow channel, the manifold block is provided with a valve seat, the valve cavity is connected to the inlet flow channel or the outlet flow channel through the valve seat, and the valve core can cooperate with the valve seat to control the opening or closing of the diaphragm valve.

[0040] Specifically, by increasing the air pressure in the gas chamber through the air inlet, the valve core can be pushed away from the air inlet by the buffer diaphragm; when the gas chamber is under negative pressure through the air inlet, the buffer diaphragm and valve core move towards the air inlet due to the negative pressure.

[0041] At this time, the valve body can be used as a pneumatic on / off valve. The air pressure in the gas chamber can control the movement of the buffer diaphragm and the valve core, thereby controlling the opening and closing of the valve seat and thus the opening or closing of the diaphragm valve.

[0042] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0043] By providing a buffer diaphragm between the first housing and the valve core, and sealing the buffer diaphragm with the first housing to form a gas chamber, when gas is introduced into the gas chamber through the gas port to increase the gas pressure inside the gas chamber, the buffer diaphragm can deform in response to the pressure change inside the gas chamber. This allows it to transmit a force toward the valve core, coordinating with other forces acting on the valve core (such as fluid forces within the valve chamber) to achieve valve core control. Furthermore, the buffer diaphragm is positioned between the deformable portion and the gas chamber, with a gap forming between them to completely separate them. This allows the buffer diaphragm to buffer the impact force of the gas during its introduction, effectively preventing the gas impact force from directly acting on the deformable portion of the valve core assembly and causing excessive deformation. Simultaneously, the gap also provides the buffer diaphragm with a certain amount of deformable space when deformed toward the valve core assembly under the action of gas impact force, allowing the buffer diaphragm to disperse its internal stress by deforming toward the deformable portion. This avoids the initial state where the buffer diaphragm and the deformation part are in contact, which would cause the impact force at the initial state to be directly transmitted from the buffer diaphragm to the deformation part, making the deformation part still prone to damage. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0046] Figure 2 for Figure 1 A schematic diagram showing the connection between the valve core assembly and the sealing diaphragm.

[0047] Figure 3 for Figure 1 An enlarged view of position D1 in the middle.

[0048] Figure 4 for Figure 1 An enlarged view of position D2 in the middle.

[0049] Figure 5 for Figure 1 A schematic diagram showing the positions of the valve core assembly and the buffer diaphragm.

[0050] Figure 6 This is a schematic diagram of the structure of Embodiment 2 provided by this utility model.

[0051] Figure 7 A structural schematic diagram of Embodiment 3 provided by this utility model

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Manifold block; 11. Valve chamber; 101. First valve chamber; 102. Second valve chamber; 111. First opening; 112. Second opening; 12. Flow channel; 121. 123. Inlet flow channel; 122. 124. Outlet flow channel; 13. Valve seat; 14. Second conical surface; 2. Valve core assembly; 21. Valve core; 211. First conical surface; 22. Deformation part; 23. First sealing part; 3. First housing; 31. Annular protrusion; 32. Annular groove ; 4. Buffer diaphragm; 40. Deformation body; 41. Second sealing part; 42. Extension part; 5. Gas chamber; 51. Gas port; 52. Limiting protrusion; 53. Groove; 6. Second housing; 7. Sealing diaphragm; 71. Third sealing part; 72. Deformation diaphragm; 73. Connecting rod; 74. Valve core; 8. Pressure application component; 81. Mounting cavity; 82. Limiting post; 83. Spring; 84. Support component; 9. Pressure plate; 100. Sealing chamber; 110. Separation gap. Detailed Implementation

[0054] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] Example 1

[0058] See Figures 1 to 5 This utility model provides a diaphragm valve, including a manifold block 1, a valve core assembly 2, a first housing 3, a buffer diaphragm 4, and a gas chamber 5. The manifold block 1 works with the valve core assembly 2 to collect or distribute fluid within the diaphragm valve. The buffer diaphragm 4 responds to pressure changes within the gas chamber 5 by applying a force to the valve core assembly 2. This force, combined with the force exerted by the fluid on the valve core assembly 2 and the forces provided by other power structures (such as the pressure-applying component 8 mentioned later, or other pneumatic structures), controls the valve core assembly 2. In addition to transmitting force, the buffer diaphragm 4 also buffers gas impact forces.

[0059] Specifically, the manifold block 1 has a valve chamber 11 and a flow channel 12, with the valve chamber 11 and the flow channel 12 connected in communication. One end of the valve chamber 11 is configured as a first opening 111. The valve core assembly 2 includes a valve core portion 21, a deformation portion 22 connected to the outer edge of the valve core portion 21, and a first sealing portion 23 connected to the outer edge of the deformation portion 22. The thickness of the deformation portion 22 is less than the thickness of the valve core portion 21. When the valve core portion 21 reciprocates relative to the first sealing portion 23 to change the fluid state in the valve chamber 11, the deformation portion 22 will deform to achieve the first sealing portion 23 remaining stationary while the valve core portion 21 moves.

[0060] The first housing 3 is connected to the manifold block 1 and presses the first sealing part 23 onto the manifold block 1 to seal the first opening 111 of the valve core assembly 2. The buffer diaphragm 4 is sealed to the first housing 3 and is located on the side of the valve core part 21 away from the manifold block 1, and can be connected to the valve core part 21.

[0061] A gas chamber 5 is formed between the first housing 3 and the buffer diaphragm 4, and an air port 51 is provided on the first housing 3. This air port 51 is used to change the gas pressure inside the gas chamber 5. Specifically, the air port 51 connects the gas supply pipeline and the gas chamber 5. When the gas supplied by the gas pipeline is delivered into the gas chamber 5 through the air port 51, it can increase the gas pressure inside the gas chamber 5. When the gas inside the gas chamber 5 is delivered back to the gas pipeline through the air port 51 and discharged, it can decrease the gas pressure inside the gas chamber 5. The buffer diaphragm 4 can respond to the change in gas pressure inside the gas chamber 5 to transmit a force toward the valve cavity 11 to the valve core 21.

[0062] It is easy to understand that in the above scheme, by setting a buffer diaphragm 4 between the first housing 3 and the valve core 21, and sealing the buffer diaphragm 4 with the first housing 3 to form a gas chamber 5, when gas is filled into the gas chamber 5 through the gas port 51 to increase the gas pressure in the gas chamber 5, the buffer diaphragm 4 can deform in response to the pressure change in the gas chamber 5, and thus can transmit a force toward the valve cavity 11 to the valve core 21, in order to cooperate with other forces on the valve core 21 (such as the fluid force in the valve cavity 11, the force applied by the power structure, etc.) to realize the control of the valve core 21.

[0063] Reference Figure 3 A gap 110 is formed between the buffer diaphragm 4 and the deformation part 22, completely separating them. When the buffer diaphragm 4 is subjected to pressure in the gas chamber 5, the gap 110 provides space for the buffer diaphragm 4 to deform, allowing it to buffer the impact force of the gas during the gas influx. This effectively prevents the impact force of the gas from directly acting on the deformation part 22 of the valve core assembly 2, thus avoiding excessive deformation of the deformation part 22. Simultaneously, the gap 110 also provides the buffer diaphragm 4 with a certain amount of deformable space when it deforms towards the valve core assembly 2 under the action of gas impact force. This allows the buffer diaphragm 4 to first disperse its own stress through deformation, preventing direct contact between the buffer diaphragm 4 and the deformation part 22. In the initial state, this would prevent the buffer diaphragm 4 from transmitting the impact force to the deformation part 22, causing excessive stress on the deformation part 22 and making it prone to damage.

[0064] That is, by setting a buffer diaphragm 4 between the first housing 3 and the valve core assembly 2, and forming a separation gap 110 between the buffer diaphragm 4 and the deformation part 22, it is possible to apply a force toward the valve cavity 11 to the valve core 21 in conjunction with other forces acting on the valve core 21 to control the valve core 21; and it is also possible to prevent the gas from directly impacting the deformation part 22 of the valve core assembly 2, causing the deformation part 22 to be over-deformed and damaged.

[0065] It is worth noting that the "complete separation" mentioned above means that there is no contact between the end face of the buffer diaphragm 4 facing the deformation part 22 and the end face of the deformation part 22. That is, the points on the end face of the buffer diaphragm 4 and the points on the end face of the deformation part 22 must not coincide. Of course, complete separation here also refers to the state where the diaphragm valve is assembled but not used. That is, no high-pressure gas is introduced into the gas chamber 5 but it is under atmospheric pressure, and no high-pressure fluid is introduced into the valve chamber 11 and it is also under atmospheric pressure. At this time, the buffer diaphragm 4 and the deformation part 22 are completely separated.

[0066] It is also worth noting that the above-mentioned "buffer diaphragm 4 is located on the side of valve core 21 away from manifold block 1 and can be connected to valve core 21" can be implemented in various ways. For example, in the initial state, there is a certain gap between buffer diaphragm 4 and valve core 21. When buffer diaphragm 4 is compressed and deformed, it can abut against valve core 21. Alternatively, buffer diaphragm 4 can directly abut against valve core 21 in the initial state. Or, it can be bonded to the upper end face of valve core 21. Or, it can be pressed and fixed to the upper end of valve core 21 using a pressing structure. The specific configuration can be determined according to actual needs (such as prioritizing ease of installation, prioritizing the transmission effect between buffer diaphragm 4 and valve core 21, and prioritizing the service life of buffer diaphragm 4).

[0067] In this embodiment, the diaphragm valve is used as a pressure regulating valve.

[0068] See Figure 1 and Figure 2 The diaphragm valve (pressure regulator) also includes a second housing 6, a sealing diaphragm 7, and a pressure-applying component 8. A second opening 112 is provided on the side of the valve chamber 11 away from the first opening 111, and the manifold block 1 is fixedly connected to the second housing 6 on this side. A sealing diaphragm 7 for sealing the second opening 112 is provided between the second housing 6 and the manifold block 1, and a pressure-applying component 8 is provided between the sealing diaphragm 7 and the second housing 6.

[0069] The manifold block 1 has a valve seat portion 13 that divides the valve chamber 11 into two parts. A partial portion of the sealing diaphragm 7 penetrates the valve seat portion 13 and can cooperate with the valve seat portion 13. The sealing diaphragm 7 is fixedly connected to the valve core portion 21. Of course, in other embodiments, a portion of the valve core portion 21 can also penetrate the valve seat portion 13 and cooperate with the valve seat portion 13, and the portion of the valve core portion 21 penetrating the valve seat portion 13 can be fixedly connected to or abut against the sealing diaphragm 7.

[0070] It is understandable that by providing a first opening 111 and a second opening 112 on the manifold block 1, and by installing the first housing 3 and the second housing 6 on the side of the manifold block 1 where the first opening 111 and the second opening 112 are respectively provided, it is convenient to cooperate and install the sealing diaphragm 7, the valve core assembly 2 and the pressure application component 8.

[0071] Specifically, the valve chamber 11 is divided into a first valve chamber 101 and a second valve chamber 102 by the valve seat portion 13, wherein the first opening portion 111 is located on the side of the first valve chamber 101 away from the valve seat portion 13, and the second opening portion 112 is located on the side of the first valve chamber 101 away from the valve seat portion 13.

[0072] See Figure 1 and Figure 2 The flow channel 12 includes an inlet flow channel 121 and an outlet flow channel 122. The outlet flow channel 122 is connected to the first valve chamber 101, and the inlet flow channel 121 is connected to the second valve chamber 102.

[0073] The sealing diaphragm 7 includes a third sealing part 71, a deformable diaphragm 72, a connecting rod 73, and a valve core 74. The third sealing part 71 is sealed and pressed against the manifold block 1 by the second housing 6 to seal the second opening 112. The radially inner side of the third sealing part 71 is connected to the deformable diaphragm 72, and the radially inner side of the deformable diaphragm 72 is connected to the connecting rod 73. The connecting rod 73 extends from the deformable diaphragm 72 toward the first housing 3 and is fixedly connected to the valve core 21, specifically by a threaded connection. The connecting rod 73 also extends from the deformable diaphragm 72 toward the second housing 6 and is fixedly connected to the pressure-applying component 8, specifically by abutment. The valve core 74 is fixedly connected to the connecting rod 73, specifically by integral molding during processing, so as to move synchronously with the connecting rod 73 and control the size of the opening between it and the valve seat 13. Furthermore, the pressure-applying component 8 includes a mounting cavity 81, a limiting post 82, a spring 83, and a support member 84. The mounting cavity 81 is opened on the second housing 6, the limiting post 82 is fixed in the mounting cavity 81, one end of the spring 83 is sleeved on the limiting post 82, and the other end is sleeved on the support member 84. The support member 84 is connected to the connecting rod 73, specifically by abutment.

[0074] It is worth noting that in other embodiments, the aforementioned connecting rod 73 and valve core 21 can also be connected by abutment, bonding, snap-fit, etc., and the connecting rod 73 and pressure application component 8 can also be connected by welding, bonding, threaded connection, snap-fit, etc.

[0075] See Figure 1 and Figure 2 The end of the connecting rod 73 closer to the first housing 3 in the axial direction is designated as "upper," and the end of the connecting rod 73 closer to the second housing 6 in the axial direction is designated as "lower." When analyzing the force on the sealing diaphragm 7 and the valve core assembly 2 as a whole, it will be subjected to a downward force F1 exerted by the gas in the gas chamber 5 through the buffer diaphragm 4 on the valve core 21. One end face of the valve core 21 forms one end face of the first valve cavity 101. The fluid in the first valve cavity 101 will exert an upward force F2 on the valve core 21 and the deformation part 22. The part of the sealing diaphragm 7 (specifically the valve core 74) located in the second valve cavity 102 will be subjected to a force F4 exerted by the fluid in the second valve cavity 102. The fluid in the second valve cavity 102 will exert a force F5 on the deformation diaphragm 72. The pressure-applying component 8 can apply an upward elastic force f to the connecting rod 73.

[0076] The movement of the valve core 21 can be controlled by F1, F2, F3, F4, F5, and f. Specifically, when the valve core 21 is in pressure equilibrium, that is, when the fluid pressure in the first valve chamber 101 is at a predetermined value, F1 + F3 + F5 = F2 + F4 + f. However, in actual use, the resultant forces of F4, F3, and F5 are opposite in direction and similar in magnitude, so they have little impact on the force balance of the entire valve core 21. At this time, the contact area between the valve core 21 and the deformation part 22 and the fluid in the first chamber 11 is large, so the magnitude of F2 is also relatively large. Therefore, when the pressure in the first chamber 11 fluctuates, it will mainly affect the movement of the valve core 21.

[0077] Specifically, when the fluid pressure in the first valve chamber 11 increases, the valve core 21 and connecting rod 73 move upward, reducing the opening of the valve seat 13 and thus lowering the fluid pressure in the first valve chamber 11. Conversely, when the fluid pressure in the first valve chamber 11 decreases, the valve core 21 and connecting rod 73 move downward, increasing the opening of the valve seat 13 and thus increasing the fluid pressure in the first valve chamber 11. This ensures that the fluid pressure in the first valve chamber 101 remains within a predetermined range, preventing significant fluctuations in the fluid pressure and stabilizing the pressure within the first valve chamber 101.

[0078] To increase the service life of the buffer diaphragm 4, it can be designed as an elastic diaphragm. This allows the buffer diaphragm 4 to buffer impact stress through elastic deformation, preventing excessive local stress on the buffer diaphragm 4 caused by gas impact and potential damage. The buffer diaphragm 4 can preferably be made of rubber, such as fluororubber or perfluoroether rubber, while the valve core assembly 2 can be made of resin, preferably PTFE or PFA. The advantage of this material selection is that rubber meets the elasticity requirements of the buffer diaphragm 4, allowing it to disperse stress through deformation under impact. The resin material of the valve core assembly 2 ensures higher cleanliness and prevents corrosion or contamination of the fluid when in contact with the fluid in the valve cavity 11.

[0079] Furthermore, when the buffer diaphragm 4 is subjected to the gas in the gas chamber 5, the buffer diaphragm 4 can elastically deform to contact the deformable part 22.

[0080] This design ensures that when gas enters the gas chamber 5, it first impacts the buffer diaphragm 4, thus preventing the gas from directly impacting the deformation part 22 and causing it to be easily damaged. At the same time, the buffer diaphragm 4 will deform towards the deformation part 22 to disperse its local stress and prevent the buffer diaphragm 4 itself from being easily damaged. If the impact force of the gas is too large, the buffer diaphragm 4 will further deform to contact the deformation part 22, so that both can overcome the impact force at the same time.

[0081] In other words, through the above structure, the buffer diaphragm 4 can act as a barrier, preventing the gas impact force from directly impacting the deformable part 22 and causing damage to it. Simultaneously, when the impact force is too large, the buffer diaphragm 4 can deform to contact the deformable part 22, thereby sharing the impact force and ensuring a long service life for the final structure. It should also be noted that the buffer diaphragm 4 is in an elastically deformed state when in contact with the deformable part 22; that is, when the impact force decreases, the buffer diaphragm 4 can recover its deformation and separate from the deformable part 22.

[0082] See Figure 1 and Figure 3The buffer diaphragm 4 includes a second sealing portion 41, which is sealed and abuts against the first sealing portion 23 to form a sealed chamber 100 between the valve core assembly 2 and the buffer diaphragm 4. This balances the pressure difference between the two end faces of the buffer diaphragm 4, preventing excessive deformation of the buffer diaphragm 4 towards the valve core assembly 2 and thus preventing damage. Specifically, when gas is introduced into the gas chamber 5, the pressure in the gas chamber 5 increases, causing the buffer diaphragm 4 to deform towards the sealed chamber 100. This reduces the volume of the sealed chamber 100 while increasing the pressure, thereby reducing the pressure difference between the two sides of the buffer diaphragm 4 and limiting further deformation of the buffer diaphragm 4, preventing excessive deformation.

[0083] At the same time, the increased pressure inside the sealed chamber 100 can also reduce the pressure difference between the upper and lower sides of the deformable part 22, preventing it from being damaged due to excessive upward deformation caused by excessive pressure difference.

[0084] Reference Figure 3 If the buffer diaphragm 4 and the top of the valve core 21 are completely fitted together and will not separate, then the sealing chamber 100 is equivalent to the separation gap 110. However, if the buffer diaphragm 4 and the top of the valve core 21 are not completely fitted together, or if the buffer diaphragm 4 and the top of the valve core 21 will separate from each other, then the sealing chamber 100 includes the separation gap 110 and the gap between the buffer diaphragm 4 and the valve core 21.

[0085] See Figure 1 and Figure 3 The deformable part 22 is connected to the outer wall of the valve core part 21, and the connection is located at the end of the outer wall of the valve core part 21 away from the buffer diaphragm 4. The thickness of the first sealing part 23 is greater than the thickness of the deformable part 22. The outer side of the deformable part 22 is connected to the inner wall of the first sealing part 23, and the connection is located at the end of the inner wall of the first sealing part 23 away from the buffer diaphragm 4. This can increase the distance between the buffer diaphragm 4 and the deformable part 22 to a certain extent (that is, increase the distance of the separation gap 110 between the two, which in this embodiment also means increasing the distance of the sealing chamber 100 located in the area between the deformable part 22 and the buffer diaphragm 4). This ensures that when the buffer diaphragm 4 abuts against the valve core part 21 and the first sealing part 23, the buffer diaphragm 4 will not directly contact the deformable part 22, but will have a certain gap. This prevents the buffer diaphragm 4 from directly causing the deformable part 22 to deform after being deformed by force. In other words, the buffer diaphragm 4 is not easy to contact the deformable part. Under normal circumstances, when subjected to impact force, it will also be in a state of non-contact with the deformable part 22.

[0086] Furthermore, referring to Figure 3The valve core 21 has a first conical surface 211 with a diameter that gradually decreases from top to bottom on the side facing the valve cavity 11 (specifically the first valve cavity 101). The manifold block 1 has a second conical surface 14 with a diameter that gradually increases from bottom to top. A guide flow channel is formed between the first conical surface 211 and the second conical surface 14. The part of the valve cavity 11 located downstream of the guide flow channel is connected to the liquid outlet flow channel 122, and the deformation part 22 is directly opposite the part of the valve cavity 11 located downstream of the guide flow channel.

[0087] It is easy to understand that as the cross-sectional area of ​​the formed guide channel gradually increases, the flow velocity of the fluid in the first valve chamber 101 will gradually decrease during the upward flow process, thereby avoiding the fluid from directly impacting the deformable part 22 at a high flow velocity, which could easily damage the deformable part 22.

[0088] Furthermore, the second sealing part 41 has an extension 42 that extends integrally upward, and the first housing 3 is provided with an annular protrusion 31 located inside the extension 42 and restricting the radial inward movement of the extension 42. Therefore, the first housing 3 and the annular protrusion 31 can achieve radial limiting of the second sealing part 41, preventing the buffer diaphragm 4 from being subjected to force and causing the second sealing part 41 to move inward, thus affecting the sealing effect of the buffer diaphragm 4 and the first housing 3.

[0089] It is worth noting that the above-mentioned "integral extension" means that the second sealing part 41 and the extension part 42 are integrally formed. Furthermore, along the diaphragm valve axis, the portion where the projection of the extension part 42 on the end face of the buffer diaphragm 4 coincides with the buffer diaphragm 4 can be considered as the area of ​​the second sealing part 41.

[0090] Furthermore, the first housing 3 and the outer wall of the annular protrusion 31 form an annular groove 32. The extension 42 is axially inserted into the annular groove 32 with an interference fit and is sealed with the inner wall of the annular groove 32. The annular groove 32 can position the extension 42 and prevent the extension 42 from bending or excessively deforming radially, thereby ensuring a good and stable sealing effect between the buffer diaphragm 4 and the first housing 3, and between the buffer diaphragm 4 and the first sealing part 23.

[0091] Furthermore, the elastic modulus of the extension 42 is less than that of the first sealing part 23, meaning that the extension 42 is more prone to deformation than the first sealing part 23. When the extension 42 is inserted into the annular groove 32 and compressed, its deformation is greater than that of the first sealing part 23, thus having greater elasticity (i.e., elastic recovery force). When the first sealing part 23 creeps, the extension 42 can also recover part of its deformation to ensure that the first sealing part 23 continues to fit tightly against it, and use its own elasticity to press the sealing part 23 onto the manifold block 1, thereby ensuring the sealing effect of the first sealing part 23.

[0092] See Figure 1 and Figure 4 A limiting protrusion 52 is provided on the end face of the gas chamber 5 away from the buffer diaphragm 4, and a groove 53 is formed around the limiting protrusion 52; the air port 51 is formed on the groove wall of the groove 53. It is easy to understand that when the buffer diaphragm 4 moves or deforms towards the gas chamber 5 under the thrust of the valve core assembly 2, the buffer diaphragm 4 will first abut against the limiting protrusion 52, so that the limiting protrusion 52 can further restrict the movement of the buffer diaphragm 4 to abut against the inner wall of the groove 53, thereby preventing the air port 51 from being blocked and affecting the gas supply to the gas chamber 5.

[0093] See Figure 1 and Figure 5 The area of ​​the buffer diaphragm 4 is larger than that of the deformable part 22, which allows the buffer diaphragm 4 to have a larger maximum deformation, thus making it less likely for the buffer diaphragm 4 to reach a deformation limit position and ensuring that the buffer diaphragm 4 is not easily damaged.

[0094] Furthermore, the buffer diaphragm 4 is configured as a disc-shaped structure. Specifically, the buffer diaphragm 4 includes a deformable body 40 facing the gas chamber 5, and a second sealing part 41 is formed at the outer edge of the deformable body 40. At this time, the buffer diaphragm 4 only seals at the outer edge, and no connection point is provided within the sealing area (i.e., the area where the buffer diaphragm 4 is aligned with the gas chamber 5, i.e., the area of ​​the deformable body 40). This is so that when one part of the buffer diaphragm 4 deforms, the initial deformation point of the buffer diaphragm 4 can drive the rest of the part to deform together, thereby avoiding stress concentration when the buffer diaphragm 4 is subjected to impact force, and thus preventing it from exceeding the deformation limit locally and causing damage.

[0095] It should be understood that at this time, there is a certain gap between the deformation body 40 of the buffer diaphragm 4 and the valve core 21 in the initial state. When the buffer diaphragm 4 is compressed and deformed to a certain extent, the buffer diaphragm 4 can abut against the valve core 21 to realize the transmission of force. Of course, it is also possible to make the deformation body 40 of the buffer diaphragm 4 abut against the upper end face of the valve core 21 in the initial state.

[0096] Example 2

[0097] See Figure 6 The difference between this embodiment and embodiment one is that the buffer diaphragm 4 (specifically its deformable body 40) is set as a ring structure, and the inner side of the buffer diaphragm 4 is fixedly connected to the valve core 21. The specific connection method is a crimping method.

[0098] Specifically, one end of the connecting rod 73 extends into the gas chamber 5 and is threadedly connected to the pressure plate 9 located in the gas chamber 5, so that the pressure plate 9 presses the buffer diaphragm 4 onto the valve core 21, thereby achieving a fixed connection between the inner side of the buffer diaphragm 4 and the valve core 21.

[0099] It is easy to understand that at this time, the connecting rod 73 is connected to the valve core 21 and the pressure plate 9 by threads, and the pressure plate 9 and the connecting rod 73 will be directly subjected to the thrust exerted by the gas in the gas chamber 5 toward the valve core 21.

[0100] Furthermore, the connecting rod 73 and the pressure plate 9 are located radially inside the air port 51 to prevent the connecting rod 73 and the pressure plate 9 from blocking the air port 51. It should be understood that, at this time, a protrusion is not required on the end face of the first housing 1 where the air port 51 is located, thereby reducing the processing difficulty of the first housing 1.

[0101] Example 3

[0102] See Figure 7 The difference between this embodiment and Embodiment 1 or Embodiment 2 is that the valve body acts as an on / off valve, and a sealed chamber is formed between the buffer diaphragm 4 and the valve core assembly 2. The air pressure within the gas chamber 5 can be controlled by connecting to an air source through the air port 51, thereby driving the movement of the valve core 23.

[0103] Specifically, by introducing gas into the gas chamber 5, the buffer diaphragm 4 is driven to move, thereby causing the valve core 23 to engage with the valve seat 13 and close the valve body. Alternatively, by placing the gas chamber 5 under negative pressure, both the buffer diaphragm 4 and the valve core 23 can move upward, thereby separating the valve core 23 from the valve seat 13 and opening the valve body.

[0104] Of course, in other embodiments, the valve body can also be a pneumatic valve body such as a backflow valve or a combination valve, which has the aforementioned mutually cooperating gas chamber, buffer diaphragm and valve core assembly.

[0105] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A diaphragm valve, comprising: The manifold block has a valve chamber and a flow channel, wherein the valve chamber and the flow channel are connected, and one end of the valve chamber is configured as a first opening. A valve core assembly includes a valve core portion, a deformable portion connected to the outer edge of the valve core portion, and a first sealing portion connected to the outer edge of the deformable portion; the thickness of the deformable portion is less than the thickness of the valve core portion, and the valve core portion can reciprocate relative to the first sealing portion through the deformation of the deformable portion, thereby changing the state of the fluid in the valve cavity; A first housing is connected to the manifold block and presses the first sealing part onto the manifold block to achieve the sealing of the first opening of the valve cavity by the valve core assembly; The diaphragm valve is characterized by further comprising: A buffer diaphragm is sealed to the first housing. The buffer diaphragm is located on the side of the valve core away from the manifold block and can be connected to the valve core. A gas chamber is formed between a first housing and a buffer diaphragm, and an air port is provided on the first housing. The air port is used to change the gas pressure in the gas chamber. The buffer diaphragm can respond to the change in gas pressure in the gas chamber to transmit a force toward the valve core. The buffer diaphragm and the deformable part are separated by a gap that completely separates them, so that when the buffer diaphragm is subjected to pressure in the gas chamber, the gap provides space for the buffer diaphragm to deform.

2. A diaphragm valve according to claim 1, characterized in that, The buffer diaphragm includes a second sealing portion, which is sealed and abuts against the first sealing portion to form a sealed chamber between the valve core assembly and the buffer diaphragm.

3. A diaphragm valve according to claim 2, characterized in that, The second sealing portion has an extension that extends integrally upward, and the first housing is provided with an annular protrusion located inside the extension and restricting the radial inward movement of the extension.

4. A diaphragm valve according to claim 3, characterized in that, The first housing and the outer wall of the annular protrusion form an annular groove. The elastic modulus of the extension is less than that of the first sealing part. The extension is axially interference-inserted into the annular groove and is sealed to the inner wall of the annular groove.

5. A diaphragm valve according to any one of claims 1-4, characterized in that, The area of ​​the buffer diaphragm is larger than the area of ​​the deformable part; The buffer diaphragm is a disc-shaped structure; or, the buffer diaphragm is an annular structure, and the inner side of the buffer diaphragm is fixedly connected to the valve core.

6. A diaphragm valve according to claim 1, characterized in that, The deformable part is connected to the outer wall of the valve core, and the connection is located at the end of the outer wall of the valve core away from the buffer diaphragm. The thickness of the first sealing part is greater than the thickness of the deformable part. The outer side of the deformable part is connected to the inner wall of the first sealing part, and the connection point is located at the end of the inner wall of the first sealing part away from the buffer diaphragm.

7. A diaphragm valve according to claim 1, characterized in that, A limiting protrusion is provided on the end face of the gas chamber away from the buffer diaphragm, and a groove is formed on the periphery of the limiting protrusion; The air vent is formed on the groove wall surface.

8. A diaphragm valve according to claim 1, characterized in that, The buffer diaphragm is an elastic diaphragm. When the buffer diaphragm is subjected to the gas in the gas chamber, the buffer diaphragm can elastically deform to contact the deformed part.

9. A diaphragm valve according to claim 1, characterized in that, The valve cavity has a second opening on the side away from the first opening, and the manifold block is fixedly connected to a second housing on this side. A sealing diaphragm for sealing the second opening is provided between the second housing and the manifold block. A pressure-applying component is provided between the sealing diaphragm and the second housing. The manifold block has a valve seat that divides the valve cavity into two parts. One of the sealing diaphragm and the valve core passes through the valve seat and can cooperate with the valve seat. The sealing diaphragm is fixed or abuts against the valve core. The force exerted by the pressure-applying component on the sealing diaphragm, the force exerted by the gas chamber on the valve core assembly through the buffer diaphragm, and the force exerted by the fluid pressure in the manifold block on the valve core and the sealing diaphragm together control the movement of the valve core and the sealing diaphragm, thereby changing the opening size of the valve seat.

10. The diaphragm valve according to claim 2, characterized in that, The flow channel includes an inlet flow channel and an outlet flow channel. A valve seat is provided inside the manifold block. The valve chamber is connected to the inlet flow channel or the outlet flow channel through the valve seat. The valve core can cooperate with the valve seat to control the opening or closing of the diaphragm valve. Specifically, by increasing the air pressure in the gas chamber through the air inlet, the valve core can be pushed away from the air inlet by the buffer diaphragm; when the gas chamber is under negative pressure through the air inlet, the buffer diaphragm and valve core move towards the air inlet due to the negative pressure.

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