A diaphragm valve

Abstract

The utility model provides a diaphragm valve, include: manifold piece, have valve cavity, liquid inlet flow channel and liquid outlet flow channel, valve cavity one end forms to have opening, valve core subassembly, including valve core part, deformation part and sealing part, shell, with manifold piece links to each other, to seal part pressure bonding between both, and make valve core subassembly seal opening, operating part, sealing part along valve core subassembly center axis direction is provided with opposite first wall and second wall, first wall and manifold piece between pressure bonding have annular convex, annular convex ring sets in opening outside, and annular convex integral setting is on first wall or manifold piece, second wall and shell between pressure bonding have the elastic piece of compression, elastic piece and sealing part material are different, and the elastic modulus of elastic piece material is less than the elastic modulus of sealing part material, wherein, set up the plane perpendicular to valve core subassembly center axis as reference surface, on the orthographic projection of reference surface, annular convex and elastic piece at least part coincide and set up, have guarantee diaphragm valve effective sealing's advantage.

Description

Technical Field

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

[0002] A diaphragm valve typically includes a manifold block, a housing, a diaphragm, and a drive unit. The diaphragm is pressed between the manifold block and the housing, forming a valve cavity between the manifold block and the diaphragm. The manifold block has a flow channel that communicates with the valve cavity. The drive unit is mounted on the housing to control the movement of the diaphragm, thereby changing the fluid state within the valve cavity.

[0003] In the diaphragm valve described above, in order to ensure the sealing effect between the diaphragm and the manifold block, an annular protrusion can be provided on the manifold block to increase the pressure at the contact point between the annular protrusion and the diaphragm, thereby achieving a better sealing effect.

[0004] However, since the diaphragm is pressed between the manifold block and the housing during the connection, the tightness of the installation between the manifold block and the housing will affect the pressing effect of the diaphragm. In actual installation, it has been found that the pressing force at the diaphragm is easily either too small or too large. When the pressing force is too small, leakage is likely to occur at the diaphragm seal; when the pressing force is too large, it will affect the seal life, especially when the diaphragm, annular protrusion, and manifold block are made of resin. In this case, excessive pressing force will cause excessive deformation at the diaphragm, and excessive pressing force will cause accelerated creep at the contact point of the diaphragm and annular protrusion, which will easily lead to seal failure at the diaphragm due to excessive creep. 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. To achieve the above objective, this utility model adopts the following technical solution:

[0006] A diaphragm valve, comprising:

[0007] A manifold block has a valve chamber, an inlet flow channel, and an outlet flow channel. The inlet flow channel is connected to the valve chamber for supplying fluid into the valve chamber, and the outlet flow channel is connected to the valve chamber for outputting fluid from the valve chamber. One end of the valve chamber has an opening.

[0008] The valve core assembly includes a valve core portion, a deformation portion located on the outer periphery of the valve core portion, and a sealing portion located on the outer periphery of the deformation portion. The movement of the valve core assembly can change the state of the fluid inside the valve cavity.

[0009] The housing is connected to the manifold block to press the sealing portion between them and to seal the opening with the valve core assembly;

[0010] The operating part is used to apply a force in the axial direction to the valve core assembly to affect the movement of the valve core assembly;

[0011] The sealing part is provided with a first wall and a second wall opposite to each other along the central axis of the valve core assembly;

[0012] At least one annular protrusion is pressed between the first wall and the manifold block. The annular protrusion is arranged around the outside of the opening and is integrally formed on the first wall or the manifold block.

[0013] A compressed elastic element is pressed between the second wall and the shell. The elastic element is made of a different material than the sealing part, and the elastic modulus of the elastic element is less than that of the sealing part.

[0014] In this context, the plane of the vertical valve core assembly's central axis is taken as the reference plane, and on the orthographic projection of the reference plane, the annular protrusion and the elastic element at least partially overlap.

[0015] In the above scheme, by setting the elastic element, the pressure seal at the annular protrusion can be achieved through its elastic force. This allows the elastic element to be further compressed when the tightness between the manifold block and the housing is too great (for example, when the screws that fix the connection between the two are tightened too much). Since the elastic modulus of the elastic element is less than that of the sealing part, the elastic element will be further compressed, thereby avoiding excessive deformation of the sealing part. In this case, since the elastic modulus of the elastic element is relatively small, the increase in the elastic force of the elastic element will not be too large, that is, it ensures that the pressure at the annular protrusion will not be too great, thereby ensuring that the part of the sealing part and the annular protrusion that cooperate with each other will not be excessively deformed or have its creep aggravated.

[0016] In other words, by setting the above-mentioned elastic element, it is ensured that the sealing part will not be excessively deformed during installation, and that the pressure on the annular protrusion will not be too great during use, thus preventing the creep from being aggravated. This ensures both the sealing effect and the service life.

[0017] The annular protrusion structure can be integrally set on the first wall, and the elastic force of the elastic element makes the annular protrusion and the manifold block seal and press together; or the annular protrusion structure can be integrally set on the manifold block, and the elastic force of the elastic element makes the annular protrusion and the first wall seal and press together.

[0018] Preferably, the elastic element is configured as an O-ring structure, and the annular protrusion has at least two rings;

[0019] The elastic element has a median diameter line, the diameter of which is equal to the difference between the inner diameter and the outer diameter of the elastic element;

[0020] Specifically, when the elastic element is in a free state, the difference between the center diameter of the elastic element and the outer diameter of the innermost annular protrusion is greater than the difference between the center diameter of the elastic element and the inner diameter of the outermost annular protrusion.

[0021] In the above scheme, by setting the annular protrusion to multiple rings, a multi-layer seal can be formed to ensure the sealing effect between the annular protrusion and the sealing part.

[0022] Furthermore, since the inner annular protrusion (i.e., the annular protrusion closer to the deformation part and valve cavity) is more susceptible to the influence of the deformation part's movement, it is prone to sealing failure. However, in the case of multi-ring annular protrusion sealing, the inner annular protrusion can block the influence of the deformation part's movement, making the sealing environment of the outer annular protrusion (i.e., the annular protrusion farther from the deformation part and valve cavity) more stable. In other words, prioritizing the sealing effect of the outer annular protrusion results in a better final sealing effect. Therefore, in the above solution, by setting the elastic element as an O-ring structure, the compression of the elastic element is maximized near the center diameter, i.e., the elastic force is maximized at this point. At the same time, the center diameter of the elastic element is set closer to the outer annular protrusion, thereby applying a greater force to the contact point between the sealing part and the outer annular protrusion, effectively ensuring the sealing effect of the outer annular protrusion. Of course, the aforementioned free state of the elastic element refers to the state when the elastic element is not compressed or deformed.

[0023] Preferably, the elastic element is configured as an annular cylindrical structure.

[0024] In the above scheme, when the elastic element is set as an annular cylindrical structure, its height is not limited by the width. Compared with the O-ring, it can have a greater amount of compression when the width is the same, thus allowing for better adjustment of its elastic force.

[0025] Preferably, the manifold block has a first abutment wall disposed inside the annular protrusion, and the housing has a second abutment wall disposed inside the elastic element, with a portion of the sealing portion sandwiched between the first abutment wall and the second abutment wall.

[0026] In the above scheme, the sealing part is clamped by the first abutting wall and the second abutting wall, which can achieve the initial fixation of the sealing part and avoid the deformation of the sealing part at the annular protrusion caused by the movement of the deformable part, thereby affecting the sealing effect.

[0027] Preferably, the manifold block is fixedly connected with a crimping protrusion that can abut against the sealing part, and the crimping protrusion is an annular structure arranged around the outside of the opening;

[0028] The opening sidewall is an opening wall, and the first abutting wall is connected to the opening wall by a pressing protrusion.

[0029] In the above solution, the crimping protrusion ensures full contact with the sealing part, further restricting the deformation of the sealing part near the deformation part and affecting the sealing of the sealing protrusion located on the outer side of the crimping protrusion. At the same time, the crimping protrusion also prevents gaps from forming due to insufficient contact between the sealing part and the manifold block, which could lead to dead corners.

[0030] Preferably, in the cross-section obtained by the plane passing through the central axis of the valve core assembly, the outlines of the crimping protrusion and the annular protrusion are both arc lines, wherein the length of the outline of the crimping protrusion is greater than the length of the outline of the annular protrusion.

[0031] And / or, with the central axis of the valve core assembly as the vertical direction, the end of the crimping protrusion and the end of the annular protrusion away from the first abutment wall are at the same height.

[0032] In the above scheme, the outer wall surfaces of the crimping protrusion and the annular protrusion are smooth curved surfaces without obvious edges and corners, which is conducive to achieving a more uniform stress distribution and reducing the possibility of stress concentration. This can prevent excessive stress at the sealing part corresponding to the crimping protrusion and the annular protrusion, which would make the sealing part that mates with the crimping protrusion and the sealing part that mates with the annular protrusion prone to creep.

[0033] The difference between a crimping protrusion and an annular protrusion is that the second wall opposite to the crimping protrusion abuts against the second abutting wall, while the second wall opposite to the annular protrusion abuts against the elastic element. That is, in this case, if the crimping force at the annular protrusion is too great, the deformation of the elastic element can ensure that the crimping force at the annular protrusion does not increase suddenly; while the crimping force at the crimping protrusion will increase suddenly.

[0034] Therefore, by setting the outline length of the crimping protrusion to be greater than the outline length of the annular protrusion, it can be ensured that when the crimping protrusion is pressed, the crimping area between the crimping protrusion and the first wall is not too small, which would cause excessive stress at the crimping point and lead to structural deformation, damage, or reduced service life.

[0035] Furthermore, by placing the ends of the crimping protrusion and the annular protrusion furthest from the first abutment wall at the same height, it avoids the situation where, when the height of the crimping protrusion is higher than that of the annular protrusion, the pressure is concentrated at the crimping protrusion, resulting in poor contact between the annular protrusion and the sealing part. Simultaneously, it also avoids excessive stress on the sealing part corresponding to the crimping protrusion, which could easily lead to creep in the sealing part mating with the crimping protrusion. Additionally, it also avoids the situation where, when the height of the crimping protrusion is lower than that of the annular protrusion, the pressure at the crimping protrusion is too low to effectively limit the deformation of the sealing part.

[0036] Preferably, an annular groove is formed between the housing or the housing and the manifold block, and the annular groove is coaxially arranged with the opening;

[0037] Along the central axis of the valve core assembly, the elastic element is interference-fitted into the annular groove.

[0038] In the above scheme, the annular groove can limit the excessive radial deformation of the elastic element or prevent bending when it is squeezed, so as to ensure that it has a sufficiently large axial elastic force.

[0039] Preferably, the outer diameter of the elastic element in its free state is greater than or equal to the outer diameter of the annular groove, and / or the inner diameter of the elastic element in its free state is less than or equal to the inner diameter of the annular groove.

[0040] The above method enables the positioning and installation of the elastic element, avoiding uneven force on the sealing part caused by the eccentricity of the elastic element.

[0041] Preferably, along the central axis of the valve core assembly, the height of the annular protrusion is H, and the compression of the elastic element in the installed state is Y, then H / Y satisfies: 0.4≤H / Y≤0.6.

[0042] The above solution ensures that even when the annular protrusion and the sealing part opposite to the annular protrusion undergo significant creep, the elastic element still has sufficient elasticity to guarantee the seal between the annular protrusion and the sealing part, and between the elastic element and the sealing part.

[0043] Preferably, there is a preset distance between two adjacent annular protrusions, the width of which is W1 and the width of the annular protrusion is W2, then W1 / W2 satisfies: 0.5≤W1 / W2≤1.5.

[0044] By using the above scheme, and by reasonably setting the spacing between two adjacent annular protrusions and the width of each annular protrusion itself, it is possible to avoid situations where the sealing part is easily damaged due to stress superposition between the annular protrusions when two adjacent annular protrusions are closely connected or the spacing is too small.

[0045] It is easy to understand that when the sealing part is pressed against the annular protrusion, the part pressed against the top of the annular protrusion is compressed, while the rest is stretched. In this case, if the spacing of the annular protrusions is too small, bending stress and tensile stress will be superimposed on the sealing part, making the sealing part prone to accelerated creep or micro-cracks. The present solution, by reasonably setting the spacing width, can avoid the superposition of bending stress and tensile stress on the sealing part, thus avoiding accelerated creep or micro-cracks.

[0046] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0047] 1. By incorporating an elastic element, the annular protrusion can be press-sealed using its elasticity. This prevents excessive deformation of the sealing part when the tightness between the manifold block and the housing is excessive (e.g., when the screws used to fix the connection are tightened too much). Furthermore, because the elastic modulus of the elastic element is relatively small, the increase in elastic force will not be excessive, ensuring that the pressure at the annular protrusion is not too high. This prevents excessive deformation and accelerated creep of the mating part between the sealing part and the annular protrusion. In other words, the elastic element ensures that the sealing part will not deform excessively during installation and that the pressure at the annular protrusion will not be too high during use, thus guaranteeing a good sealing effect.

[0048] 2. By setting the annular protrusion to multiple rings, a multi-layer seal can be formed to ensure the sealing effect between the annular protrusion and the sealing part. Furthermore, since the inner annular protrusion (i.e., the annular protrusion closer to the deformation part and valve cavity) is more susceptible to the movement of the deformation part, it is prone to sealing failure. However, with a multi-ring annular protrusion seal, the inner annular protrusion can block the influence of the deformation part's movement, making the sealing environment of the outer annular protrusion (i.e., the annular protrusion farther from the deformation part and valve cavity) more stable. In other words, prioritizing the sealing effect of the outer annular protrusion results in a better final sealing effect. Therefore, in the above solution, by setting the elastic element as an O-ring structure, the compression of the elastic element is maximized near its center diameter, i.e., the elastic force is greatest at this point. Simultaneously, the center diameter of the elastic element is set closer to the outer annular protrusion, thereby applying a greater force specifically to the contact point between the sealing part and the outer annular protrusion, effectively ensuring the sealing effect of the outer annular protrusion.

[0049] 3. By making the outer wall surfaces of the crimping protrusion and the annular protrusion smooth curved surfaces without obvious edges and corners, it is beneficial to achieve a more uniform stress distribution, reduce the possibility of stress concentration, and thus avoid excessive stress at the sealing part corresponding to the crimping protrusion and the annular protrusion, which would make the sealing part that mates with the crimping protrusion and the sealing part that mates with the annular protrusion prone to creep. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a structural schematic diagram provided in Embodiment 1 of this utility model.

[0052] Figure 2 for Figure 1 An enlarged diagram of position D1.

[0053] Figure 3a This is a schematic diagram showing the relative position of the center diameter of the elastic element in Embodiment 1 of this utility model when it is located radially outside the outermost annular protrusion.

[0054] Figure 3b This is a schematic diagram showing the relative position of the elastic element in Embodiment 1 of this utility model when the diameter line is located between two adjacent annular protrusions and is biased towards the outer side.

[0055] Figure 3c This is a schematic diagram showing the relative position of the inner diameter of the elastic element and the projection of the outer ring annular protrusion in Embodiment 1 of this utility model.

[0056] Figure 4 This is a structural schematic diagram provided in Embodiment 2 of this utility model.

[0057] Figure 5 for Figure 4 An enlarged view of position D2 in the middle.

[0058] Figure 6 This is a structural schematic diagram provided in Embodiment 3 of this utility model.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. Manifold block; 11. First valve chamber; 12. Second valve chamber; 13. First flow channel; 14. Second flow channel; 15. Third flow channel; 16. Opening; 161. Opening wall; 17. First abutment wall; 18. Valve seat; 2. Valve core assembly; 21. Valve core part; 22. Deformation part; 23. Sealing part; 231. First wall; 232. Second wall; 3. Housing; 31. Second abutment wall; 4. Operating part; 5. Annular protrusion; 6. Elastic element; 7. Press-fit protrusion; 8. Annular groove. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] 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. Example 1

[0064] See Figures 1 to 2 This utility model provides a diaphragm valve, including a manifold block 1, a valve core assembly 2, a housing 3, and an operating part 4.

[0065] The manifold block 1 has a valve chamber, an inlet flow channel and an outlet flow channel connected to the valve chamber. The inlet flow channel is connected to the valve chamber to deliver fluid to the valve chamber 11, and the outlet flow channel is connected to the valve chamber to output the fluid in the valve chamber.

[0066] For specific reference Figure 1 The manifold block 1 has two valve chambers, namely a first valve chamber 11 and a second valve chamber 12, and a first flow channel 13, a second flow channel 14, and a third flow channel 15 are provided within the manifold block 1. For the first valve chamber 11, the first flow channel 13 serves as its inlet flow channel, and the second flow channel 14 serves as its outlet flow channel; for the second valve chamber 12, the second flow channel 14 serves as its inlet flow channel, and the third flow channel 15 serves as its outlet flow channel.

[0067] Both the first valve chamber 11 and the second valve chamber 12 have an opening 16 at one end, and the valve core assembly 2 can seal the opening 16.

[0068] The valve core assembly 2 includes a valve core portion 21, a deformation portion 22 located on the outer periphery of the valve core portion 21, and a sealing portion 23 located on the outer periphery of the deformation portion 22. The movement of the valve core assembly 2 can change the state of the fluid in the valve chamber 11. In the two valve core assemblies 2, one of the valve core portions 21 is disposed through the second flow channel 14, and the two valve core portions 21 are abutted or fixedly connected, thereby enabling the two to transmit axial abutment force.

[0069] The manifold block 1 is also connected to a housing 3, which is used to press the sealing part 23 between the two, thereby enabling the valve core assembly 2 to seal the opening 16.

[0070] An operating part 4 is provided on the valve core assembly 2. The operating part 4 is used to apply an axial force to the valve core assembly 2 to affect the movement of the valve core assembly 2. Specifically, the operating part 4 is located on the side of the valve cavity assembly 2 away from the second flow channel 14. It can be positioned between the valve core assembly 2 and the housing 3, or it can be partially protruding from the housing 3.

[0071] Since there are two valve chamber assemblies 2, there are also two operation units 4 in this embodiment.

[0072] The operating unit 4 can be a pneumatic structure, a spring-assisted structure, or an electrically assisted structure.

[0073] For ease of description, Figure 1 Using the central axis Z of the valve core assembly 2 as a reference, and taking the direction perpendicular to the central axis Z as the radial direction, the positions relatively closer to the central axis Z along the direction perpendicular to the central axis Z (i.e., radially upwards) are radially inner, while the positions relatively farther away from the central axis Z are radially outer, i.e., outer. Figure 1 From this perspective, "above" refers to the area above the diaphragm valve; with Figure 1 From this perspective, "down" refers to the area below the diaphragm valve, which is also the Z-direction of the central axis. Figure 1 From a top-down or bottom-up perspective.

[0074] Specifically, in this embodiment, fluid enters the first valve chamber 11 from the first flow channel 13, flows out of the first valve chamber 11 from the second flow channel 14 and flows into the second valve chamber 12, and the fluid in the second valve chamber 12 finally flows out from the third flow channel 15.

[0075] In this embodiment, the diaphragm valve is a first type of pressure regulating valve, the bottom end of the second flow channel 14 is a valve seat 18, and the valve core assembly 2 in the first cavity 11 can cooperate with the valve seat 18 to control its opening degree.

[0076] Reference Figure 1In the valve body, the contact area between the valve core assembly 2 in the second chamber 12 and the fluid is greater than that between the valve core assembly 2 in the first chamber 11 and the fluid. That is, the force balance of the valve core assembly 2 is mainly affected by the fluid pressure in the second chamber 12. In other words, the pressure regulating valve mainly moves the valve core assembly 2 up and down according to the pressure change of the fluid in the second valve chamber 12, thereby changing the fluid pressure in the second valve chamber 12, and ultimately reducing the pressure fluctuation in the second valve chamber 12, so as to achieve a relatively stable pressure in the second valve chamber 12.

[0077] Its specific working principle is as follows:

[0078] In an ideal environment, the forces exerted by the first valve chamber 11 and the second valve chamber 12 on the valve core assembly 2, and the forces exerted by the two operating parts 4 on the two valve core assemblies 2 are in a balanced state, so that the valve seat 18 maintains a certain opening.

[0079] In actual use, the pressure of the fluid at the front end will constantly change due to pump delivery and other factors, which will in turn cause the pressure in the second chamber 12 to also constantly change. When the pressure in the second valve chamber 12 decreases, the upward fluid pressure on the valve core assembly 2 decreases. At this time, the downward force on the two valve core assemblies 2 is greater than the upward force, meaning the resultant force will cause the valve core assembly 2 to move downward, increasing the opening of the valve seat 18 and thus increasing the pressure in the second valve chamber 12. Similarly, when the pressure in the second valve chamber 12 increases, the valve core assembly 2 will move upward to decrease the pressure in the second valve chamber 12. Therefore, throughout the entire process, the pressure in the second valve chamber 12 can be maintained within the required pressure range, preventing large-scale pressure changes.

[0080] For ease of description, please refer to Figure 1 as well as Figure 2 To enhance the sealing effect between the sealing portion 23 and the opening 16 of the valve core assembly 2, the sealing portion 23 is positioned along the central axis of the valve core assembly 2 (i.e., Figure 1A first wall 231 and a second wall 232 are provided opposite each other along the central axis Z of the manifold block 1. An annular protrusion 5 is pressed between the first wall 231 and the manifold block 1. The annular protrusion 5 is arranged around the outside of the opening 16 and is integrally formed on the manifold block 1. Of course, in other embodiments, the annular protrusion 5 may also be integrally formed on the first wall 231 of the sealing part 23. A compressed elastic element 6 is pressed between the second wall 232 and the housing 3. The elastic element 6 is made of a different material than the sealing part 23, and the elastic modulus of the elastic element 6 is less than that of the sealing part 23. The plane of the vertical valve core assembly 2's central axis Z is taken as the reference plane. On the orthographic projection of the reference plane, the annular protrusion 5 and the elastic element 6 partially overlap. Of course, in other embodiments, on the orthographic projection of the reference plane, the annular protrusion 5 may be completely covered by the elastic element 6. It is worth noting that this includes all the annular protrusions 5 in the diaphragm valve.

[0081] It should be understood that by providing an elastic element 6 between the second wall 232 and the housing 3, the elastic force generated when the elastic element 6 is compressed can provide a pressing force to the annular protrusion 5, so as to ensure that the annular protrusion 5 can be pressed and sealed. Moreover, the elastic modulus of the elastic element 6 is less than that of the sealing part 23, so that when the tightness between the manifold block 1 and the housing 3 is too great (for example, when the screws that fix the connection between the two are tightened too much), the elastic element 6 will be further compressed, thereby avoiding excessive deformation of the sealing part 23. In this case, since the elastic modulus of the elastic element 6 is relatively small, the increase in the elastic force of the elastic element 6 will not be too great, that is, to ensure that the pressure at the annular protrusion 5 is not too great, thereby ensuring that the part of the sealing part 23 and the annular protrusion 5 that cooperate with each other will not be excessively deformed or have its creep aggravated.

[0082] In other words, by setting the above-mentioned elastic element 6, it is ensured that the sealing part 23 will not be excessively deformed during installation, and the pressure at the annular protrusion 5 during use will not be too great, which would exacerbate the creep of the sealing part 23, thereby ensuring its sealing effect and service life.

[0083] It should be noted that in the aforementioned structure, precisely because the elastic element 6 and the sealing part 23 are made of different materials, and the elastic modulus of the elastic element 6 is less than that of the sealing part 23, when both are under pressure, the elastic element 6 is primarily compressed, while the sealing part 23 experiences less compression deformation. In common structures, the elastic element 6 can be made of rubber, such as fluororubber or perfluoroether rubber, while the sealing part 23 can be made of resin, preferably PTFE or PFA.

[0084] See Figure 1 Both valve core assemblies 2 can be provided with elastic elements 6 on the side away from the valve cavity 11.

[0085] It should be understood that in the upper valve core assembly 2, the first wall 231 is located below the second wall 232; in the lower valve core assembly 2, the first wall 231 is located above the second wall 232. That is, the first wall 231 is located on the side of the sealing part 23 closer to the valve cavity 11 and is provided with an annular protrusion 5, while the second wall 232 is located on the side of the sealing part 23 closer to the housing 3 and is provided with an elastic member 6 on that side, and the elastic member 6 is pressed between the second wall 232 and the housing 3 on the corresponding side.

[0086] In this embodiment, the valve core assembly 2 located at the bottom and the housing 3 located at the bottom are used as examples for further explanation.

[0087] See Figures 1 to 2 The annular protrusion 5 has two rings, thus forming two layers of seal in the radial direction of the diaphragm valve to ensure the sealing effect between the annular protrusion 5 and the sealing part 23. It is understood that in other embodiments, the annular protrusion 5 may also have three, four, or more rings to achieve multi-level sealing. On the one hand, this ensures that if one annular protrusion 5 fails, the remaining annular protrusions 5 can still play a sealing role. On the other hand, the multiple annular protrusions 5 increase the contact area between the sealing part 23 and the manifold block 1, thereby further preventing excessive contact force between a single annular protrusion 5 and the sealing part 23, which could lead to easy creep in the sealing part 23 area corresponding to that annular protrusion 5.

[0088] Furthermore, the central axis of the annular protrusion 5 and the central axis of the elastic element 6 are both set to coincide with the central axis Z of the valve core assembly 2, that is, they are set to be coaxial. This makes the end face of the sealing part 23 more uniformly stressed, thereby increasing the sealing performance between the sealing part 23 and the manifold block 1.

[0089] Furthermore, the elastic element 6 is configured as an O-ring structure, and the elastic element 6 has a center diameter line, the diameter of which is equal to the diameter difference between the inner diameter and the outer diameter of the elastic element.

[0090] When the elastic element 6 is in a free state, the difference between the center diameter of the elastic element 6 and the outer diameter of the innermost annular protrusion 5 is greater than the difference between the center diameter of the elastic element 6 and the inner diameter of the outermost annular protrusion 5. For details, please refer to... Figure 2 (exist Figure 2 The elastic element 6 is in a free state and not in an installed state (the shape of the elastic element 6 in the installed state is not shown). In this cross section, line C of the elastic element 6 is the median diameter line of the elastic element 6, and is coaxial with line C and has the same diameter. However, the loop lines at different heights from line C are all median diameter lines of the elastic element 6.

[0091] Among them, the diameter difference between the middle diameter line C and the outer diameter of the innermost annular protrusion 5 is S1, and the diameter difference between the middle diameter line C and the inner diameter of the outermost annular protrusion 5 is S2, where S1 > S2.

[0092] It is easy to understand that when the elastic element 6 is an O-ring structure, the closer it is to the center diameter line C, the greater the compression of the elastic element 6. That is, the compression of the elastic element 6 is greatest near the center diameter line C, and the elastic force is also greatest at this location. At the same time, by setting the center diameter line C of the elastic element 6 closer to the outer ring annular protrusion 5, a greater force can be applied to the contact point between the sealing part 23 and the outer ring annular protrusion 5, thereby effectively ensuring the sealing effect of the outer ring annular protrusion 5.

[0093] It is worth noting that because the inner annular protrusion 5 (i.e., the annular protrusion 5 closer to the deformation part 22 and valve cavity 11) is more susceptible to the influence of the movement of the deformation part 22, the inner annular protrusion 5 is prone to sealing failure. However, in the case of multi-ring annular protrusion 5 sealing, the inner annular protrusion 5 can block the influence of the movement of the deformation part 22, making the sealing environment of the outer annular protrusion 5 (i.e., the annular protrusion 5 farther away from the deformation part 22 and valve cavity 11) more stable. In other words, the sealing effect of the outer annular protrusion 5 is prioritized, resulting in a better final sealing effect. That is, through the structure of the multi-ring annular protrusion 5 and the elastic element 6, and the position of the center diameter line C relative to the inner and outer annular protrusion 5, the inner annular protrusion 5 plays a role in resisting the dynamic interference of the deformation part 22, while the outer annular protrusion 5 plays the main sealing role.

[0094] The aforementioned free state refers to the state in which the elastic element 6 is placed on a horizontal surface, the central axis of the elastic element 6 is perpendicular to the horizontal surface, and no other external force is applied to the elastic element 6.

[0095] The median diameter C of the elastic element 6 can be located radially outside the outermost annular protrusion 5 (see...). Figure 3a ); or an annular protrusion 5 can be set between two adjacent annular protrusions 5 and offset outwards (see Figure 3b This also allows the outermost annular protrusion 5 to coincide with the median diameter C of the elastic element 6 (see...). Figure 3c It is worth noting that the term "overlap" here refers to the projection overlap in the direction of force on the elastic element 6 (that is, in the direction of the central axis Z of the valve core assembly 2).

[0096] See Figure 1 and Figure 2 The manifold block 1 has a first abutting wall 17 disposed inside the annular protrusion 5, and the housing 3 is provided with a second abutting wall 31 located inside the elastic member 6. Part of the sealing part 23 is sandwiched between the first abutting wall 17 and the second abutting wall 31, thereby enabling the sealing part 23 to be initially fixed, preventing the movement of the deformable part 22 from causing the sealing part 23 at the annular protrusion 5 to deform, thus affecting the sealing effect.

[0097] See Figure 1 and Figure 2 An annular groove 8 is formed between the housing 3 and the manifold block 1. The annular groove 8 is coaxially arranged with the opening 16. In the installation state, the elastic element 6 is interference-fitted into the annular groove 8 along the central axis of the valve core assembly 2. This installation state refers to the state after all the structures in the valve body, such as the housing 3, manifold block 1, and valve core assembly 2, have been installed.

[0098] The annular groove 8 can limit excessive radial deformation of the elastic element 6, ensuring that it has sufficient axial elastic force. Of course, in other embodiments, the annular groove 8 can also be formed directly on the housing 3, which can achieve positioning and limiting of the elastic element 6.

[0099] Furthermore, when the elastic element 6 is in a free state, the outer diameter of the elastic element 6 is greater than or equal to the outer diameter of the annular groove 8. This ensures that when the elastic element 6 is installed inside the annular groove 8, the outer wall of the elastic element 6 will abut against the outer wall of the annular groove 8, thereby positioning the elastic element 6 and preventing the elastic element 6 from becoming eccentric relative to the annular groove 8 and the opening 16 after installation. This also prevents the elastic force applied by the elastic element 6 to the sealing part 23 from being unevenly distributed along the outer periphery of the opening 16, which could lead to poor sealing performance of the sealing part 23.

[0100] Of course, in other embodiments, the inner diameter of the elastic member 6 in its free state may be simultaneously or only made smaller than or equal to the inner diameter of the annular groove 8. The inner walls of both can be used to position the elastic member 6.

[0101] See Figure 2 Along the central axis of valve core assembly 2, the height of the annular protrusion 5 is H, and the compression of the elastic element 6 in the installed state is Y (in this embodiment, the elastic element 6 is entirely located within the annular groove 8 during installation, therefore...). Figure 2 The portion of the elastic element 6 protruding from the annular groove 8 is the compression amount. Therefore, the ratio of H to Y (H / Y) can be set to 0.4, 0.5, or 0.6. By appropriately setting the compression amount of the elastic element 6, it is possible to ensure that even when the annular protrusion 5 and the sealing portion 23 opposite to it undergo significant creep, the elastic element 6 still possesses sufficient elasticity to guarantee the seal between the annular protrusion 5 and the sealing portion 23, and between the elastic element 6 and the sealing portion 23. Of course, it should be understood that H / Y can satisfy the condition: 0.4 ≤ H / Y ≤ 0.6.

[0102] See Figure 2There is a preset distance between two adjacent annular protrusions 5, the width of which is W1, and the width of the annular protrusion 5 is W2. The ratio of W1 to W2 (W1 / W2) can be set to 0.5, 1, or 1.5. By reasonably setting the distance between two adjacent annular protrusions 5 and the width of each annular protrusion 5 itself, the stress superposition between the annular protrusions 5 can be avoided, which could lead to damage to the sealing part 23 if the two adjacent annular protrusions 5 are too close together or the distance is too small. Of course, it should be understood that W1 / W2 can satisfy: 0.5 ≤ W1 / W2 ≤ 1.5.

[0103] It is worth noting that when the sealing part 23 is pressed against the annular protrusion 5, the part pressed against the top of the annular protrusion 5 is compressed, while the rest is stretched. In this case, if the spacing of the annular protrusions 5 is too small, bending stress and tensile stress will be superimposed on the sealing part 23, which will make the sealing part 23 prone to accelerated creep or microcracks. However, the reasonable setting of the spacing width in this solution can avoid the superposition of bending stress and tensile stress on the sealing part 23, and avoid the sealing part 23 from accelerating creep or microcracks. Example 2

[0104] See Figure 4 and Figure 5 Compared to Embodiment 1, the difference in this embodiment is that the elastic element 6 is set as an annular cylindrical structure so that the height of the elastic element 6 is not limited by the width. Compared to setting the elastic element 6 as an O-ring, it can have a greater amount of compression when the width is the same, so that its elastic force can be better adjusted.

[0105] At this time, the annular groove 8 cooperates with the elastic element 6, which can not only limit the excessive radial deformation of the elastic element 6, but also prevent the elastic element from bending.

[0106] Furthermore, in order to facilitate the installation of the elastic element 6 and the annular groove 8, one end of the elastic element 6 can be provided with a chamfer to guide the elastic element 6 into the annular groove 8, or the end of the elastic element 6 inserted into the annular groove 8 can be set as an arc surface.

[0107] Furthermore, the manifold block 1 is fixedly connected with a pressing protrusion 7 that can abut against the sealing part 23. The pressing protrusion 7 is an annular structure that is arranged around the outside of the opening 16.

[0108] The sidewall of the opening 16 is the opening wall 161, and the first abutting wall 17 is connected to the opening wall 161 by the pressing protrusion 7. Since the pressing protrusion 7 protrudes from the first abutting wall 17, the pressing protrusion 7 can better press the sealing part 23 during installation, so as to further limit the deformation of the sealing part 23 on the side near the deformable part 22, thereby avoiding the deformation of the sealing part 23 from affecting the sealing effect of the sealing part 23; at the same time, the pressing protrusion 7 ensures full contact with the sealing part 23, and can also avoid the sealing part 23 and the manifold block 1 not being fully contacted, resulting in gaps and dead corners.

[0109] Furthermore, in the cross-section obtained by the plane passing through the central axis of the valve core assembly 2, the outlines of the pressing protrusion 7 and the annular protrusion 5 are both arc lines, that is, the outer wall surfaces of the pressing protrusion 7 and the annular protrusion 5 are smooth curved surfaces without obvious edges and corners. This is conducive to achieving a more uniform stress distribution, reducing the possibility of stress concentration, and thus avoiding excessive stress at the sealing part 23 corresponding to the pressing protrusion 7 and the annular protrusion 5, which would easily cause creep in the sealing part 23 that mates with the pressing protrusion 7 and the sealing part 23 that mates with the annular protrusion 5.

[0110] Furthermore, the outline length of the crimping protrusion 7 is greater than the outline length of the annular protrusion 5. The area of ​​the sealing part 23 facing away from the crimping protrusion 7 abuts against the second abutment wall 31, while the area of ​​the sealing part 23 facing away from the annular protrusion 5 abuts against the elastic element 6. When the crimping degree between the manifold block 1 and the housing 3 is too large, the crimping force in the area where the sealing part 23 mates with the annular protrusion 5 will not be too large due to the presence of the elastic element 6, while the crimping force in the area where it mates with the crimping protrusion 7 is prone to being too large. Therefore, by setting the outline of the crimping protrusion 7 to be larger, it is to ensure the pressure-bearing area of ​​the crimping protrusion 7 and avoid the situation where the crimping area of ​​the crimping protrusion 7 is too small, which would lead to stress damage at the crimping protrusion 7.

[0111] Furthermore, with the central axis Z of the valve core assembly 2 as the vertical direction, the ends of the pressing protrusion 7 and the annular protrusion 5 furthest from the first abutment wall 17 are at the same height. See also... Figure 5 The ends of the pressing protrusion 7 and the annular protrusion 5 that are away from the first abutting wall 17 are both located on the horizontal plane P.

[0112] It is not difficult to understand that, with Figure 5For example, when the height of the pressing protrusion 7 is higher than that of the annular protrusion 5, the pressure is more concentrated on the contact between the annular protrusion 5 and the sealing part 23, which makes it impossible for the pressing protrusion 7 to fully contact the sealing part 23, thus failing to limit the sealing part 23 and making it easy for gaps to occur between the sealing part 23 and the first contact wall 17; when the height of the pressing protrusion 7 is lower than that of the annular protrusion 5, the pressure will be more concentrated on the pressing protrusion 7, which not only makes it easy for the pressure at the pressing protrusion 7 to be too high and accelerate creep, but also makes it easy for the contact effect between the annular protrusion 5 and the sealing part 23 to be poor.

[0113] The pressing protrusion 7 prevents poor contact between the annular protrusion 5 and the sealing part 23. Simultaneously, it further avoids excessive stress on the sealing part 23 corresponding to the pressing protrusion 7, which could lead to creep in the sealing part 23 that mates with the pressing protrusion 7. Furthermore, it prevents insufficient pressure at the pressing protrusion 7 when its height is lower than the annular protrusion 5, thus avoiding the inability to effectively limit deformation of the sealing part 23. Example 3

[0114] Compared to Embodiment 1, the difference in this embodiment is that the diaphragm valve is not a pressure regulating valve, but rather an on / off valve.

[0115] Specific reference Figure 6 In this embodiment, only one valve chamber, valve core assembly 2 and operating part 4 are provided. The operating part 4 is used to control the movement of valve core assembly 2 so as to realize the valve chamber in an open or closed state, that is, to realize the flow path opening and closing.

[0116] In this embodiment, the sealing effect of the sealing part 23 is also ensured by the cooperation of the annular protrusion 5 and the elastic element 6 with the sealing part 23.

[0117] It should be noted that in other embodiments, the diaphragm valve may also be a back suction valve, a switching valve, or a needle valve, or a combination valve of two or more of the above.

[0118] 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: A manifold block has a valve chamber, an inlet flow channel, and an outlet flow channel. The inlet flow channel is connected to the valve chamber for supplying fluid into the valve chamber, and the outlet flow channel is connected to the valve chamber for outputting fluid from the valve chamber. One end of the valve chamber has an opening. The valve core assembly includes a valve core portion, a deformation portion located on the outer periphery of the valve core portion, and a sealing portion located on the outer periphery of the deformation portion. The movement of the valve core assembly can change the state of the fluid inside the valve cavity. The housing is connected to the manifold block to press the sealing portion between them and to seal the opening with the valve core assembly; The operating part is used to apply a force in the axial direction to the valve core assembly to affect the movement of the valve core assembly; Its features are, The sealing part is provided with a first wall and a second wall opposite to each other along the central axis of the valve core assembly; At least one annular protrusion is pressed between the first wall and the manifold block. The annular protrusion is arranged around the outside of the opening and is integrally formed on the first wall or the manifold block. A compressed elastic element is pressed between the second wall and the shell. The elastic element is made of a different material than the sealing part, and the elastic modulus of the elastic element is less than that of the sealing part. In this context, the plane of the vertical valve core assembly's central axis is taken as the reference plane, and on the orthographic projection of the reference plane, the annular protrusion and the elastic element at least partially overlap.

2. A diaphragm valve according to claim 1, characterized in that, The elastic element is configured as an O-ring structure, and the annular protrusion has at least two rings; The elastic element has a median diameter line, the diameter of which is equal to the difference between the inner diameter and the outer diameter of the elastic element; Specifically, when the elastic element is in a free state, the difference between the center diameter of the elastic element and the outer diameter of the innermost annular protrusion is greater than the difference between the center diameter of the elastic element and the inner diameter of the outermost annular protrusion.

3. A diaphragm valve according to claim 1, characterized in that, The elastic element is configured as an annular cylindrical structure.

4. A diaphragm valve according to claim 1, characterized in that, The manifold block has a first abutment wall disposed inside the annular protrusion, and the housing has a second abutment wall disposed inside the elastic element. A portion of the sealing part is sandwiched between the first abutment wall and the second abutment wall.

5. A diaphragm valve according to claim 4, characterized in that, The manifold block is fixedly connected with a crimping protrusion that can abut against the sealing part. The crimping protrusion is an annular structure arranged around the outside of the opening. The opening sidewall is an opening wall, and the first abutting wall is connected to the opening wall by a pressing protrusion.

6. A diaphragm valve according to claim 5, characterized in that, In the cross section obtained by the plane passing through the central axis of the valve core assembly, the outlines of the crimping protrusion and the annular protrusion are both arc lines, wherein the length of the outline of the crimping protrusion is greater than the length of the outline of the annular protrusion. And / or, with the central axis of the valve core assembly as the vertical direction, the end of the crimping protrusion and the end of the annular protrusion away from the first abutment wall are at the same height.

7. A diaphragm valve according to any one of claims 1-6, characterized in that, An annular groove is formed between the housing or the housing and the manifold block, and the annular groove is coaxially arranged with the opening. In the installed state, the elastic element is interference-fitted into the annular groove along the central axis of the valve core assembly.

8. A diaphragm valve according to claim 7, characterized in that, The outer diameter of the elastic element in its free state is greater than or equal to the outer diameter of the annular groove, and / or the inner diameter of the elastic element in its free state is less than or equal to the inner diameter of the annular groove.

9. A diaphragm valve according to claim 1, characterized in that, Along the central axis of the valve core assembly, the height of the annular protrusion is H, and the compression of the elastic element in the installed state is Y. Then H / Y satisfies: 0.4≤H / Y≤0.

6.

10. A diaphragm valve according to claim 2, characterized in that, There is a preset distance between two adjacent annular protrusions, the width of which is W1, and the width of the annular protrusion is W2. Then W1 / W2 satisfies: 0.5≤W1 / W2≤1.5.

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