Diaphragm valve

Abstract

The utility model discloses a diaphragm valve which comprises a valve body. The valve assembly comprises a valve element, a deformation part surrounding the outer side of the valve element and an outer edge part located on the outer side of the deformation part, and the outer edge part is fixed to the valve body in a sealed mode; the driving assembly comprises a valve rod connected with the valve element, and the valve element can be controlled to move axially through the valve rod, so that the valve element opens or closes the valve seat; the diaphragm valve further comprises a first supporting piece and a second supporting piece, the first supporting piece is axially fixed in the valve body, and the second supporting piece is axially and movably arranged in the valve body. The first supporting piece and the second supporting piece are arranged on the side, away from the valve seat, of the valve assembly, so that the positions of the first supporting piece and the second supporting piece can be switched relative to the deformation part when the diaphragm valve is opened or closed, the deformation part of the diaphragm can be effectively supported no matter the diaphragm valve is in an opened state or a closed state, and the safety of the diaphragm valve is improved. Damage caused by excessive deformation of the deformation part due to fluid pressure in the valve body is avoided, so that the service life of the diaphragm valve is prolonged.

Description

Technical Field

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

[0002] A diaphragm valve is a special type of valve that uses a diaphragm to separate the fluid chamber inside the valve body from other parts, preventing the fluid chamber from coming into contact with the structure of other parts. This effectively ensures the cleanliness of the fluid inside the valve body or prevents the fluid from corroding other structures. Therefore, it is suitable for the transport and control of high-cleanliness or corrosive liquids. In a diaphragm valve, the fluid pressure acts on the diaphragm. To prevent the diaphragm from deforming due to fluid pressure and from being damaged by stress concentration, a support structure is provided on the back of the diaphragm to support it.

[0003] For example, patent CN217898795U discloses a diaphragm valve for conveying corrosive fluids, including a valve body having an inlet channel, an outlet channel, and a valve port for the corrosive fluid to flow through, the valve port connecting the inlet channel and the outlet channel; a valve assembly including a valve core, a diaphragm portion disposed circumferentially along the valve core, and a fixing portion disposed on the outer ring of the diaphragm portion, the fixing portion sealingly connecting the valve assembly to the valve body, the valve core reciprocating axially to block or open the valve port, the diaphragm portion deforming as the state of the valve core changes; a diaphragm pressure plate connected axially above the valve body; the bottom of the diaphragm pressure plate has a contoured surface, which can abut against the diaphragm portion to provide support when the valve core opens the valve port.

[0004] If the diaphragm is directly installed in the outlet flow channel, a certain fluid pressure will still exist at the rear end of the valve body when the valve body is closed. Therefore, the fluid will still exert pressure on the diaphragm when the valve body is closed, making the diaphragm prone to deformation and damage due to the fluid pressure. Alternatively, if the diaphragm is directly installed in the inlet flow channel, the diaphragm will be subjected to fluid pressure in both the open and closed states. In the valve body described in the aforementioned patent, the contoured surface at the bottom of the diaphragm pressure plate can only support the diaphragm when the valve body is open. When the valve body is closed, the diaphragm is still easily damaged by the fluid pressure. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a diaphragm valve to solve the problem that the diaphragm cannot be supported when the diaphragm valve is closed, which leads to diaphragm damage.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a diaphragm valve, comprising: a valve body having an inflow channel, an outflow channel, and a valve seat for fluid passage, the valve seat connecting the inflow channel and the outflow channel; a valve assembly including a valve core, a deformable portion surrounding the outside of the valve core, and an outer edge portion located outside the deformable portion, the outer edge portion being sealed and fixed to the valve body; a drive assembly including a valve stem connected to the valve core, the valve stem controlling the axial movement of the valve core to open or close the valve seat; the diaphragm valve further includes a first support member and a second support member, both located on the side of the valve assembly away from the valve seat; the first support member is axially fixed in the valve body, and the second support member is axially movable in the valve body; wherein, the drive assembly can drive the axial movement of the second support member to change the relative position of the first support member and the second support member; so that in the valve seat open state, the first support member can support the deformable portion, and in the valve seat closed state, the second support member can support the deformable portion. This technical solution has the following technical effects:

[0007] This invention provides a first support and a second support on the side of the valve assembly away from the valve seat, and sets the second support to be able to change its axial position relative to the first support under the drive of the drive assembly. This allows the valve stem of the drive assembly to move the valve core toward the valve seat to close the valve seat, while simultaneously moving the second support relative to the first support toward the valve seat. When the valve core closes the valve seat, in the portions of the first and second supports that are opposite to the deformed part, the bottom end of the second support is closer to the deformed part than the bottom end of the first support. When the deformed part deforms due to the fluid pressure inside the valve body, the second support can support the deformed part to prevent it from being damaged by excessive pressure. When the valve stem of the drive assembly moves the valve core away from the valve seat to open the valve seat, it also moves the second support relative to the first support away from the valve seat. When the valve core opens the valve seat, in the portions of the first and second supports that are opposite to the deformed part, the bottom end of the first support is closer to the deformed part than the bottom end of the second support. At this time, when the deformed part deforms due to the fluid pressure inside the valve body, the first support can support the deformed part to prevent it from being damaged by excessive pressure. That is, the first support and the second support can switch positions relative to the deformable part when the diaphragm valve is open or closed, so that the deformable part of the diaphragm can be effectively supported regardless of whether the diaphragm valve is open or closed, so as to avoid excessive deformation of the deformable part due to excessive fluid pressure in the valve body and damage, and extend the service life of the diaphragm valve.

[0008] In the aforementioned diaphragm valve, a first support member has a first support portion for supporting the deformable part, and a second support member has a second support portion for supporting the deformable part. Specifically, in the valve seat open state, there is a height difference between the outer sides of the bottom walls of the first and second support portions; in the valve seat closed state, there is a height difference between the inner sides of the bottom walls of the first and second support portions. When the valve seat is open, the height difference between the outer sides of the bottom walls of the first and second support portions allows the bottom wall of the first support portion to stably support the deformable part; when the valve seat is closed, the height difference between the inner sides of the bottom walls of the first and second support portions allows the bottom wall of the second support portion to stably support the deformable part. This height difference ensures that after the second support portion moves axially relative to the first support portion into position, both support portions independently support the deformable part without mutual interference, resulting in good support for the deformable part.

[0009] In the aforementioned diaphragm valve, multiple first and second support portions are provided, with clearance gaps between adjacent first support portions. Multiple second support portions axially move within each clearance gap. The clearance gaps ensure relative axial movement between the first and second support portions without interference. Simultaneously, the multiple spaced first support portions provide multi-point support for the deformable portion. When the valve seat is open, if the deformable portion is subjected to fluid pressure, the pressure is distributed to each of the first support portions, significantly reducing the stress on the deformable portion and preventing concentrated stress at any one location, thus extending its service life. By configuring the second support portions to cooperate with the clearance gaps, they provide multi-point support for the deformable portion when the valve seat is closed. The pressure on the deformable portion is distributed to each of the second support portions, preventing concentrated stress at any one location and thus preventing excessive deformation and damage.

[0010] In the aforementioned diaphragm valve, the bottom surface of the first support portion has a symmetrical structure, and in the horizontal plane projection, the projections of the clearance gaps on both sides of the bottom surface of the first support portion are symmetrical about the axis of symmetry of the projection of the bottom surface of the first support portion; and / or, a separation gap is formed between two adjacent second support portions, and the bottom surface of the second support portion has a symmetrical structure, and in the horizontal plane projection, the projections of the separation gaps on both sides of the bottom surface of the second support portion are symmetrical about the axis of symmetry of the projection of the bottom surface of the second support portion. Because the projections of the clearance gaps on both sides of the bottom surface of the first support are symmetrical about the axis of symmetry of the projection of the bottom surface of the first support, when the valve seat is in the open state, if the fluid in the valve body applies pressure to the deformable part so that the deformable part abuts against the first support, the positions corresponding to the two clearance gaps on both sides of the bottom surface of the first support will be subjected to equal pressure. This avoids the deformable part from being twisted circumferentially due to different forces on the positions corresponding to the clearance gaps on both sides of the bottom surface of the first support, thus preventing damage to the deformable part caused by twisting. Similarly, because the projections of the partition gaps on both sides of the bottom surface of the second support are symmetrical about the axis of symmetry of the projection of the bottom surface of the second support, when the valve seat is in the closed state, if the fluid in the valve body applies pressure to the deformable part so that the deformable part abuts against the second support, the positions corresponding to the two partition gaps on both sides of the bottom surface of the second support will be subjected to equal pressure. This avoids the deformable part from being twisted circumferentially due to different forces on the positions corresponding to the partition gaps on both sides of the second support.

[0011] In the aforementioned diaphragm valve, multiple first support portions and multiple clearance gaps are evenly distributed around the valve stem in a circumferential manner. The evenly distributed first support portions and clearance gaps ensure that the stress on the deformable portion is more uniform, preventing excessive deformation and damage caused by uneven stress distribution.

[0012] In the aforementioned diaphragm valve, the drive assembly controls the axial movement of the second support member to either extend the bottom of the second support portion to the lower side of the clearance gap, or retract the bottom of the second support portion into or above the clearance gap. This allows the second support portion to extend below the clearance gap to support the deformable part when the valve is closed, and to extend into or above the clearance gap when the valve is open, enabling the first support portion to support the deformable part.

[0013] In the aforementioned diaphragm valve, the first support member includes an outer cylinder, with a first support portion extending radially inward from the inner wall of the outer cylinder; the second support member includes an inner cylinder fixed to the valve stem, with multiple second support portions extending radially outward from the outer wall of the inner cylinder. The outer cylinder provides a circumferential mounting position for the first support portion, and the inner cylinder provides a circumferential mounting position for the second support portions. During assembly, simply installing the outer cylinder onto the valve body and the inner cylinder onto the valve stem, with the valve stem inserted into the valve body, achieves the installation and mating of the first and second support members. This simplifies the structure of the first and second support members, facilitates installation, and ensures a stable and reliable mating between the first and second support members.

[0014] In the aforementioned diaphragm valve, the valve body includes a valve body with a valve seat and an upper shell mounted on the valve body. A first support member also has a radially outwardly protruding portion, and the protruding portion and its outer edge are fixedly clamped between the valve body and the upper shell. During valve stem movement, a portion of the second support member is always located in the clearance gap. When the upper shell is locked onto the valve body, the upper shell and the valve body together clamp the protruding portion and its outer edge, thus fixing the protruding portion and its outer edge between the upper shell and the valve body. This achieves the installation and positioning of the first support member and facilitates its disassembly and assembly. When the first support member is damaged and requires repair, it is easy to disassemble and replace, reducing maintenance costs. Simultaneously, it serves to limit the movement of the first support member, preventing it from rotating. Throughout the entire process of the second support sliding with the valve stem, a portion of the second support is always located in the clearance gap. The clearance gap can limit the second support in the circumferential direction and guide it in the axial direction, preventing the second support from rotating during its up-and-down movement. This avoids the diaphragm and the second support from rotating circumferentially during the valve opening and closing process, and thus prevents the diaphragm from twisting due to circumferential rotation.

[0015] In the aforementioned diaphragm valve, the valve assembly further includes a separator diaphragm located above the deformable portion. When the deformable portion is supported, the separator diaphragm is pressed between the deformable portion and the first or second support member. The first and second support members do not directly contact the deformable portion to support it; instead, they support it through the sheet-like separator diaphragm. When the deformable portion is pressed against the separator diaphragm by the pressure of the fluid within the valve body, the separator diaphragm can disperse the supporting force applied to the deformable portion by the first or second support member, making the supporting force evenly distributed on the separator diaphragm. This results in a more uniform pressure distribution throughout the deformable portion, preventing the supporting force from concentrating at the point where the deformable portion contacts the first or second support member. Consequently, it avoids situations where excessive local pressure on the deformable portion leads to indentations or excessive stress concentration in certain areas of the deformable portion, causing excessive deformation and potential damage.

[0016] In the aforementioned diaphragm valve, the diaphragm has a movable portion opposite to the deformable portion and an outer portion located outside the movable portion. The outer portion is clamped and fixed between the outer edge portion and the first support portion. By clamping and fixing the outer periphery of the diaphragm, it is easy to assemble and disassemble while restricting the movement of the diaphragm. When the diaphragm is compressed, its outer portion is clamped and fixed, preventing the outer portion from moving inward towards the diaphragm, thereby preventing the diaphragm from concave into the clearance gap. This avoids the situation where the diaphragm cannot adequately distribute the supporting force due to concavity into the clearance gap, ensuring that the diaphragm can stably and adequately distribute the supporting force, resulting in more uniform pressure distribution throughout the deformable portion.

[0017] In the aforementioned diaphragm valve, the diaphragm, in its natural state, has a first state where its inner side bulges upwards. In this first state, a gap is provided between the movable part and the bottom wall of the first support part. The natural state refers to the situation where the pressure inside the valve body is the same as the external atmospheric pressure. The first state refers to the diaphragm maintaining its upward bulge without external force. This ensures that the diaphragm is in a tensioned state even before it is fully attached to the first support member. In this state, the diaphragm provides a certain supporting force to the deformable part. When the diaphragm is subjected to fluid pressure to further attach to the first support member, it will become even more taut. In this taut state, a greater force is required to overcome the tension force if the diaphragm continues to tighten. Therefore, when fluid pressure acts on the deformable part, the diaphragm is less prone to deformation, i.e., it is less likely to deform into the clearance gap. This enhances the diaphragm's supporting effect on the deformable part, allowing the diaphragm to better support the deformable part.

[0018] In the aforementioned diaphragm valve, a vertical plane passing through the valve stem's central axis is taken as the cross-section. Over the same radial length, the length of the cross-section intercepted by the vertical plane on the deformable part is greater than the length of the cross-section intercepted by the vertical plane on the movable part. By setting the length of the cross-section intercepted by the vertical plane on the movable part to be less than the length of the cross-section intercepted by the vertical plane on the deformable part, the deformable area of ​​the movable part is smaller than the deformable area of ​​the deformable part. When the movable part is recessed into the clearance gap and tensioned, the deformable part, due to its larger deformability, is not yet in a tensioned state. Therefore, at this time, the already tensioned movable part can support the deformable part at the clearance gap, preventing excessive recessing of the deformable part into the clearance gap and avoiding the situation where the deformable part is easily damaged due to lack of support at the clearance gap.

[0019] In the aforementioned diaphragm valve, a movable gap is provided between the valve core and the second support member. The diaphragm has an inner portion located inside the movable part, at least partially situated within the movable gap, and the height of the movable gap is greater than the thickness of the inner portion. The thickness of the inner portion is less than the height of the movable gap, allowing the inner portion to move axially along the valve stem within the movable gap. The movable gap enhances the deformability of the diaphragm. When the cross-sectional length of the movable part intercepted by the vertical plane is less than the cross-sectional length of the deformed part intercepted by the vertical plane, the taut diaphragm can move within the movable gap to achieve contact with the first or second support member, ensuring effective dispersion of the supporting force and better support for the deformed part. This avoids a situation where the inner and outer sides of the diaphragm are both fixed, and when it deforms and comes into contact with the first or second support member, the deformation of the movable part alone would lead to excessive deformation of the movable part.

[0020] In the aforementioned diaphragm valve, the valve seat in the open state has a deformable part that is higher on the inside and lower on the outside, and the bottom surface of the first support part is a first inclined surface for abutting the deformable part, with the first inclined surface inclined toward the valve stem; in the closed state, the valve seat has a deformable part that is lower on the inside and higher on the outside, and the bottom surface of the second support part is a second inclined surface for abutting the deformable part, with the second inclined surface inclined toward the direction away from the valve stem. When the valve seat is in the open state, the deformable part is in a state where the inside is higher than the outside. At this time, the first inclined surface, which is higher inside and lower outside, supports the deformable part, making their slopes similar. The first inclined surface can fully support the deformable part, minimizing the deformation caused by the fluid pressure, and providing good support. When the valve seat is in the closed state, the deformable part is in a state where the outside is higher than the inside. At this time, the second inclined surface, which is higher outside and lower inside, supports the deformable part, making their slopes similar. The second inclined surface can fully support the deformable part, minimizing the deformation caused by the fluid pressure, and providing good support. Therefore, the first and second inclined surfaces are set as two surfaces with opposite inclination directions. This allows the shapes of the support surfaces of the first and second support parts to adapt as much as possible to the different states of the deformable part, enhancing their support effect, reducing the deformation caused by fluid impact, effectively preventing excessive deformation and damage to the deformable part, and extending its service life. Furthermore, under this condition, the deformation of the deformable part itself will not be too large during the opening and closing of the valve, thus avoiding damage caused by excessive stretching of the deformable part.

[0021] In the aforementioned diaphragm valve, a second inclined surface extends radially outward. The second inclined surface includes an inclined support surface and a gentle transition surface located radially outside the inclined support surface and closer to the horizontal plane. By configuring the second inclined surface with an inclined support surface and a gentle transition surface of different slopes, and making the gentle transition surface gentler than the inclined support surface, the second inclined surface can smoothly transition to the horizontal plane through the gentle transition surface. This allows the deformable part to smoothly transition to its outer edge through the gentle transition surface when the second inclined surface supports it, preventing excessive deformation and the formation of a sharp angle when the deformable part contacts the edge of the second inclined surface. This avoids stress concentration at that point, which could lead to damage.

[0022] In the aforementioned diaphragm valve, the clearance gap is larger than the second support portion, allowing for a clearance fit between the second and first support portions. When the second support portion slides within the clearance gap, the width of the clearance gap is greater than the width of the second support portion, creating a gap between the second and first support portions on both sides. This minimizes relative friction between the first and second support portions, preventing wear and dust buildup that could accumulate on the deformed portion when it subsequently comes into contact with the first or second support portion, thus preventing damage to the deformed portion.

[0023] In the aforementioned diaphragm valve, the circumferential width of the bottom surface of the first support portion and / or the bottom surface of the second support portion both increase outward along the radial direction of the valve stem. This results in a larger support area for the deformable part closer to the outer periphery of the first and second support portions. Since the fluid pressure on the outer side of the deformable part is greater, increasing the support area of ​​the outer periphery of the first and second support portions for the deformable part can effectively prevent excessive force on the outer side of the deformable part and extend its service life.

[0024] The features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] Figure 1 This is a perspective view of the diaphragm valve in Example 1;

[0027] Figure 2 This is a cross-sectional view of the diaphragm valve in the open state in Embodiment 1.

[0028] Figure 3 This is a cross-sectional view of the diaphragm valve in the closed state in Example 1;

[0029] Figure 4 for Figure 3 Enlarged view of part A;

[0030] Figure 5 This is a cross-sectional schematic diagram of the assembly state of the first support member and the second support member when the diaphragm valve is opened in Embodiment 1.

[0031] Figure 6 This is a cross-sectional schematic diagram of the assembly state of the first support member and the second support member when the diaphragm valve is closed in Embodiment 1.

[0032] Figure 7 This is a perspective view of the second support member in Embodiment 1;

[0033] Figure 8 This is a bottom view of the second support member in Embodiment 1;

[0034] Figure 9 This is a perspective view of the first support member in Embodiment 1;

[0035] Figure 10 This is a cross-sectional view of the first support member in Embodiment 1;

[0036] Figure 11 This is a bottom view of the first support member in Embodiment 1;

[0037] Figure 12 This is a cross-sectional schematic diagram of the valve assembly in Embodiment 1;

[0038] Figure 13 This is a partial cross-sectional view of the first and second supports when the diaphragm valve is closed in Embodiment 2;

[0039] Figure 14 This is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve is open in Embodiment 2;

[0040] Figure 15 This is a partial cross-sectional view of the first and second supports when the diaphragm valve is closed in Embodiment 3;

[0041] Figure 16 This is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve is opened in Embodiment 3.

[0042] Figure label:

[0043] 100. Valve body; 110. Upper shell; 111. Breathing hole; 120. Valve body; 121. Inflow channel; 122. Outflow channel; 123. Valve seat; 124. Valve cavity;

[0044] 210. Valve core; 220. Deformation part; 230. Outer edge; 240. Dividing diaphragm; 241. Outer side; 242. Moving part; 243. Inner side; 250. Movement gap;

[0045] 300. Valve stem;

[0046] 400, First support member; 410, First support part; 411, First inclined surface; 420, Clearance clearance; 430, Outer cylinder; 431, Vent hole; 432, Vent groove; 440, Protrusion;

[0047] 500, Second support member; 510, Second support part; 511, Second inclined surface; 5111, Inclined support surface; 5112, Gentle transition surface; 520, Inner cylinder; 530, Separation gap. Detailed Implementation

[0048] This utility model discloses a diaphragm valve, comprising: a valve body having an inflow channel, an outflow channel, and a valve seat for fluid passage, the valve seat connecting the inflow channel and the outflow channel; a valve assembly including a valve core, a deformable portion surrounding the outside of the valve core, and an outer edge portion located outside the deformable portion, the outer edge portion being sealed and fixed to the valve body; a drive assembly including a valve stem connected to the valve core, the valve stem controlling the axial movement of the valve core to open or close the valve seat; the diaphragm valve further includes a first support member and a second support member, both located on the side of the valve assembly away from the valve seat; the first support member is axially fixed in the valve body, and the second support member is axially movable in the valve body; wherein, the drive assembly can drive the axial movement of the second support member to change the relative position of the first support member and the second support member; so that in the valve seat open state, the first support member can support the deformable portion, and in the valve seat closed state, the second support member can support the deformable portion. This invention provides a first support and a second support on the side of the valve assembly away from the valve seat. The second support is configured to axially change position relative to the first support under the drive of the drive assembly. This allows the valve stem of the drive assembly to move the valve core towards the valve seat to close it, simultaneously moving the second support relative to the first support towards the valve seat. When the valve core closes the valve seat, the bottom end of the second support is closer to the deformation part than the first support. This allows the fluid within the valve body to be guided under pressure. When the deformable part deforms, the second support member can support it to prevent damage due to excessive pressure. During the process of the valve stem of the drive assembly moving the valve core away from the valve seat to open it, it simultaneously moves the second support member relative to the first support member away from the valve seat. When the valve core opens the valve seat, the bottom end of the first support member is closer to the deformable part than the portion of the second support member opposite to it. When the fluid in the valve body impacts the deformable part, the first support member can support it to prevent damage due to excessive pressure. In other words, the first and second supports can switch positions relative to the deformable part when the diaphragm valve is open or closed, ensuring that the deformable part of the diaphragm is effectively supported regardless of whether the diaphragm valve is open or closed. This prevents excessive deformation of the deformable part due to excessive water pressure in the valve body, thus extending the service life of the diaphragm valve.

[0049] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0050] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0054] Example 1:

[0055] A diaphragm valve, such as Figures 1 to 12As shown, the device includes a valve body 100, a valve assembly, and a drive assembly. The valve body 100 has an inflow channel 121, an outflow channel 122, and a valve seat 123 for fluid passage. The valve seat 123 is formed between the inflow channel 121 and the outflow channel 122 to connect them. The drive assembly is mounted in the valve body 100 and includes a valve stem 300 slidably connected within the valve body 100. The valve stem 300 can move along its own... The axial movement of the valve assembly, which is located in the valve body 100 and cooperates with the valve stem 300, includes a valve core 210 and a diaphragm. The valve core 210 is mounted on the end of the valve stem 300, and the diaphragm surrounds the valve core 210. The diaphragm includes a deformable portion 220 and an outer edge portion 230. The deformable portion 220 is connected to the outside of the valve core 210, and the outer edge portion 230 is located outside the deformable portion 220. The outer edge portion 230 is sealed and fixed to the valve body 100 to form a valve cavity 124 below the diaphragm (e.g., ...). Figure 2 as well as Figure 3 The valve chamber 124 is part of the outflow channel 122. When the valve stem 300 moves axially, it drives the valve core 210 to move together. The valve core 210 opens or closes the valve seat 123 by abutting against or moving away from the valve seat 123, thereby realizing the connection or disconnection of fluid between the inflow channel 121 and the outflow channel 122. Figure 3 As described above, when the valve seat 123 is open, fluid can sequentially pass through the inflow channel 121, the valve seat 123, and enter the outflow channel 122 from the upper side of the valve seat 123; of course, it can also be combined with... Figure 3 Unlike the previous one, the inflow channel 121 and the outflow channel 122 are set in opposite directions, that is, relative to the above reverse flow, that is, they flow through the inflow channel in sequence and from the upper side of the valve seat 123 into the interior of the valve seat 123, and finally flow into the outflow channel and through the diaphragm valve. At this time, the valve cavity is part of the structure of the inflow channel.

[0056] like Figure 3 as well as Figure 4 The diaphragm valve further includes a first support member 400 and a second support member 500. Both the first support member 400 and the second support member 500 are located on the side of the diaphragm of the valve assembly away from the valve seat 123. The first support member 400 is installed in the valve body 100 and is axially fixed to the valve body 100. The second support member 500 is movably connected in the valve body 100 and can move axially relative to the first support member 400.

[0057] This invention provides a first support member 400 and a second support member 500 on the side of the valve assembly away from the valve seat 123. The second support member 500 is configured to axially change position relative to the first support member 400 under the drive of the drive assembly. This allows the valve stem 300 of the drive assembly to simultaneously move the second support member 500 relative to the first support member 400 towards the valve seat 123 while the valve core 210 moves towards the valve seat 123 to close it. As a result, when the valve core 210 closes the valve seat 123, in the area where the second support member 500 and the first support member 400 are opposite the deformation part 220, the bottom of the second support member 500 is closer to the deformation part 220, ultimately... Figure 3 As shown; when the fluid inside the valve body 100 applies pressure to the deformable part 220, the second support member 500 can support the deformable part 220 to prevent it from being damaged due to excessive pressure. During the process of the valve stem 300 of the drive assembly moving the valve core 210 away from the valve seat 123 to open the valve seat 123, it simultaneously moves the second support member 500 relative to the first support member 400 away from the valve seat 123. When the valve core 210 opens the valve seat 123, in the areas where the first support member 400 and the second support member 500 are opposite to the deformable part 220, the first support member 400 is closer to the deformable part 220, thus achieving support of the deformable part 220 by the first support member 400 in the open state, and ultimately... Figure 2 As shown, when the fluid pressure in the valve chamber 124 acts on the deformable part 220, the first support member 400 can support the deformable part 220 to prevent it from being damaged due to excessive pressure. That is, the first support member 400 and the second support member 500 can switch positions relative to the deformable part 220 when the diaphragm valve is open or closed, so that the deformable part 220 of the diaphragm can be effectively supported regardless of whether the diaphragm valve is open or closed. This prevents excessive deformation of the deformable part 220 due to excessive fluid pressure in the valve chamber 124, thus extending the service life of the diaphragm valve. Of course, the open state here refers to the valve body being fully open, and the closed state refers to the valve body being fully closed.

[0058] like Figure 5 , Figure 6 , Figure 9 as well as Figure 10 As shown, in this embodiment, the first support member 400 has a first support portion 410, which supports the deformable portion 220 through its bottom wall. The side of the bottom wall of the first support portion 410 closest to the valve stem 300 is defined as the inner side of the bottom wall of the first support portion 410, and the side furthest from the valve stem 300 is defined as the outer side of the bottom wall of the first support portion 410. Figure 5 , Figure 6 , Figure 7 as well as Figure 8As shown, the second support member 500 has a second support portion 510, which supports the deformable portion 220 through its bottom wall. The side of the bottom wall of the second support portion 510 that is closer to the valve stem 300 is defined as the inner side of the bottom wall of the second support portion 510, and the side that is farther away from the valve stem 300 is defined as the outer side of the bottom wall of the second support portion 510.

[0059] The bottom walls of the first support part 410 and the second support part 510 are both inclined. Figure 5 As shown, when the valve seat 123 is in the open state, there is a height difference between the outer side of the bottom wall of the first support portion 410 and the outer side of the bottom wall of the second support portion 510, so that the bottom wall of the first support portion 410 can stably support the deformable portion 220; as Figure 6 As shown, when the valve seat 123 is in the closed state, there is a height difference between the inner side of the bottom wall of the first support part 410 and the inner side of the bottom wall of the second support part 510, so that the bottom wall of the second support part 510 can stably support the deformable part 220. The height difference setting can prevent the second support part 510 from affecting the support of the first support part 410 for the deformable part when the valve is open; at the same time, it can prevent the first support part 410 from interfering with the second support part 510 when the valve is closed. That is, after the second support part 510 moves axially relative to the first support part 410 into position, the two independently support the deformable part 220 without affecting each other, resulting in good support effect for the deformable part 220 and preventing the deformable part 220 from being damaged by excessive deformation under force.

[0060] The bottom wall of the first support portion 410 supporting the deformable portion 220 is defined as a first inclined surface 411, and the bottom wall of the second support portion 510 supporting the deformable portion 220 is defined as a second inclined surface 511. In this embodiment, the first inclined surface 411 and the second inclined surface 511 have opposite inclination directions. Figure 5 and Figure 6 As shown, the first inclined surface 411 is inclined toward the central axis of the second support portion 510 (i.e., the central axis of the valve stem 300), so that the inner side of the first inclined surface 411 is higher than the outer side. The second inclined surface 511 is inclined toward the outer periphery of the second support portion 510 (i.e., away from the central axis of the valve stem 300), so that the inner side of the second inclined surface 511 is lower than the outer side. At this time, with... Figure 2 as well as Figure 3 The upper middle side is considered the upper side. Figure 2 as well as Figure 3 The lower middle side is designated as the lower side.

[0061] When valve seat 123 is in the open state, such as Figure 2As shown, the deformable part 220 is in a state where the inside is higher than the outside. At this time, the first inclined surface 411, which is higher inside and lower outside, supports the deformable part 220, making their slopes similar. The first inclined surface 411 can provide sufficient support for the deformable part 220, minimizing the deformation caused by fluid impact, resulting in good support for the deformable part 220. When the valve seat 123 is in the closed state, as... Figure 3 As shown, the deformable part 220 is in a state where the outside is higher than the inside. At this time, the deformable part 220 is supported by a second inclined surface 511, which is higher on the outside and lower on the inside, making their slopes similar. The second inclined surface 511 can provide sufficient support for the deformable part 220, minimizing the deformation caused by fluid impact. Therefore, the first inclined surface 411 and the second inclined surface 511 are set as two surfaces with opposite inclination directions. This ensures that the shapes of the supporting surfaces of the first support part 410 and the second support part 510 adapt as closely as possible to the different states of the deformable part 220, enhancing the support effect, reducing the deformation caused by fluid impact, effectively preventing excessive deformation and damage, and extending the service life of the deformable part 220. Furthermore, this adapts to the situation where the diaphragm is lower on the inside and higher on the outside when the valve body is closed, and higher on the inside and lower on the outside when the valve body is open. This diaphragm design ensures that the diaphragm itself will not be stretched too much during the continuous opening and closing of the valve, thus guaranteeing a longer service life for the diaphragm.

[0062] In this preferred embodiment, the second inclined surface 511 extends radially outward from the second support portion 510, such as... Figure 6 As shown, the second inclined surface 511 includes an inclined support surface 5111 and a gentle transition surface 5112. The gentle transition surface 5112 is located at the end of the inclined support surface 5111 away from the valve stem 300, and the slope of the gentle transition surface 5112 is less than the slope of the inclined support surface 5111, so that the gentle transition surface 5112 is closer to the horizontal plane than the inclined support surface 5111. By configuring the second inclined surface 511 into a structure with an inclined support surface 5111 and a gentle transition surface 5112 having different slopes, and making the gentle transition surface 5112 gentler than the inclined support surface 5111, the second inclined surface 511 can smoothly transition to the horizontal plane through the gentle transition surface 5112. As a result, when the second inclined surface 511 supports the deformable part 220, the deformable part 220 can smoothly transition to the outer edge 230 through the gentle transition surface 5112, avoiding excessive deformation of the deformable part 220 when it contacts the edge of the second inclined surface 511, which would form an acute angle and easily cause stress concentration in the deformable part 220, making it prone to damage.

[0063] In this embodiment, multiple first support portions 410 and multiple second support portions 510 are provided. The multiple first support portions 410 are spaced apart and distributed around the central axis of the valve stem 300, such as... Figure 2 as well as Figure 6 As shown, a clearance gap 420 is formed between two adjacent first support parts 410, and multiple second support parts 510 are distributed around the central axis of the valve stem 300, as shown. Figure 2 As shown in Figure 7, a separation gap 530 is formed between two adjacent second support portions 510. The second support portion 510 and the clearance gap 420 are correspondingly arranged and cooperate with each other so that the second support portion 510 and the clearance gap 420 are slidably connected. The first support portion 410 and the separation gap 530 are correspondingly arranged and cooperate with each other so that the first support portion 410 and the separation gap 530 are slidably connected. During the process of the valve stem 300 driving the valve core 210 to open or close the valve seat 123, the second support portion 510 moves together with the valve stem 300 to drive the second support portion 510 to slide along the axial direction of the clearance gap 420, so as to extend or not extend out of the clearance gap 420. When the valve seat 123 is in the open state, the end of the second support 510 near the deformation part 220 does not extend out of the clearance 420, so that the first support 410 supports the deformation part 220; when the valve seat 123 is in the closed state, the end of the second support 510 near the deformation part 220 extends out of the clearance 420, so that the second support 510 supports the deformation part 220.

[0064] The difference between this structure and existing technologies lies in the following: In existing technologies, the support structure on the back of the diaphragm often incorporates a contoured surface to maximize the contact area between the surface and the diaphragm, thus providing greater support and preventing damage due to fluid pressure. However, the support scheme of this invention differs from existing technologies. Instead of pursuing a larger support area, it employs the aforementioned support method, using multiple first support parts 410 or multiple second support parts 510 to provide multi-point support for the deformable part 220. This disperses the fluid pressure on the deformable part 220, preventing localized stress concentration, such as at the root where the deformable part 220 connects to the valve core 210 and the outer edge 230, which could easily lead to damage. Therefore, even with a relatively smaller support area for the deformable part 220 compared to existing technologies, it effectively ensures that the deformable part 220 will not be damaged by fluid pressure.

[0065] More specifically, when the valve seat 123 is open, if the deformable part 220 is subjected to pressure from the fluid, the pressure exerted on the deformable part 220 will be distributed to each of the first support parts 410, greatly reducing the stress on the deformable part 220 and preventing excessive deformation damage caused by concentrated stress at a certain location, thus extending the service life of the deformable part 220. By configuring the second support part 510 to cooperate with the clearance gap 420, the second support part 510 can provide multi-point support for the deformable part 220 when the valve seat 123 is closed. The pressure exerted on the deformable part 220 will be distributed to each of the second support parts 510, thus preventing excessive deformation damage caused by concentrated stress at a certain location.

[0066] Figure 11 This is a bottom view of the first support member 400, and the projection pattern of the first support member 400 on the horizontal plane is... Figure 11 same, Figure 8 This is a bottom view of the second support member 500, and the projection pattern of the second support member 500 on the horizontal plane is... Figure 8 The same applies, therefore this embodiment uses... Figure 11 Projection of the first support member 400 onto the horizontal plane Figure 8 The description will take the projection of the second support member 500 onto the horizontal plane as an example. In this embodiment, as... Figure 11 As shown, the bottom surface of the first inclined plane 411 has a symmetrical structure, and its axis of symmetry when projected onto the horizontal plane is L1. In the horizontal projection, the projections of the clearance gaps 420 on both sides of the bottom surface of the first support part 410 are symmetrical about the axis of symmetry L1, as shown. Figure 8As shown, the bottom surface of the second inclined plane 511 is also a symmetrical structure, with its projection onto the horizontal plane having an axis of symmetry L2. The projections of the gaps 530 on both sides of the bottom surface of the second support 510 are symmetrical about the axis of symmetry L2. Because the projections of the clearance gaps 420 on both sides of the bottom surface of the first support 410 are symmetrical about the axis of symmetry L1, when the valve seat 123 is in the open state, if the fluid in the valve cavity 124 applies pressure to the deformable part 220 so that the deformable part 220 abuts against the first support 410, the positions corresponding to the two clearance gaps 420 on both sides of the deformable part 220 and the first support 410 will be subjected to equal pressure. This avoids the deformable part 220 from being subjected to different forces on the positions corresponding to the clearance gaps 420 on both sides of the first support 410, thus preventing the deformable part 220 from twisting circumferentially. The deformable part 220 is damaged; similarly, because the projections of the separation gaps 530 on both sides of the second support 510 are symmetrical about the axis of symmetry L2, when the valve seat 123 is in the closed state, if the fluid in the valve cavity 124 applies pressure to the deformable part 220 so that the deformable part 220 abuts against the second support 510, the positions corresponding to the two separation gaps 530 on both sides of the deformable part 220 and the second support 510 are subjected to equal pressure, thus avoiding the deformable part 220 from being twisted circumferentially due to different forces on the positions corresponding to the separation gaps 530 on both sides of the second support 510. Of course, it can be understood that the above description is only a preferred embodiment of this example, and it is also possible to only make the projections of the clearance gaps on both sides of the first support 510 symmetrical about the axis of symmetry L1, or only make the projections of the separation gaps on both sides of the second support 510 symmetrical about the axis of symmetry L2.

[0067] In this embodiment, the first support member 400 and the second support member 500 can have various structures. As long as a portion (i.e., a structure similar to a clearance gap) is provided on the first support member 400 for the second support member 500 to pass through, the sliding connection between the first support member 400 and the second support member 500 can be achieved. Preferably, the multiple first support portions 410 and the multiple clearance gaps 420 are evenly distributed around the valve stem 300 in a circumferential manner. The evenly distributed first support portions 410 and clearance gaps 420 can make the stress on the deformable portion 220 more uniform, avoiding excessive deformation and damage to the deformable portion 220 due to uneven stress. Moreover, the circumferential distribution of the first support portions 410 can simplify the structural processing design. At the same time, since the clearance gaps 420 are also circumferentially distributed, when the pressure of the liquid in the clearance gaps 420 applies pressure to the deformable portion 220, it can prevent the outer part of the deformable portion 220 from deforming inward or the inner part from deforming outward, thus avoiding stress concentration and damage at the root of the connection between the deformable portion 220 and the outer edge portion 230 or the valve core 210. The circumferentially distributed structure allows the pressure exerted by the fluid on the deformation section 220 at each clearance gap 420 to be better dispersed near the first support section 410 or the second support section 510, avoiding stress concentration at the root of the deformation section and ensuring the service life of the diaphragm.

[0068] In this embodiment, the first support member 400 includes an outer cylinder 430, and a first support portion 410 is disposed on the inner wall of the outer cylinder 430, extending radially from the inner wall of the outer cylinder 430 toward the interior of the outer cylinder 430. The second support member 500 includes an inner cylinder 520, which is fixed to the valve stem 300 to be linked with the valve stem 300. The second support portion 510 is disposed on the outer wall of the inner cylinder 520, extending radially from the outer wall of the inner cylinder 520 toward the exterior of the inner cylinder 520. The outer cylinder 430 provides a circumferential mounting position for the first support part 410, and the inner cylinder 520 provides a circumferential mounting position for the second support part 510. During assembly, the outer cylinder 430 is simply installed onto the valve body 100, and the inner cylinder 520 is installed onto the valve stem 300. When the valve stem 300 passes through the valve body 100, the first support 400 and the second support 500 can be installed and matched. This simplifies the structure of the first support 400 and the second support 500, facilitates installation, and ensures a stable and reliable match between the first support 400 and the second support 500.

[0069] like Figure 1-3As shown, the valve body 100 includes a valve body 120 and an upper housing 110. A valve seat 123, an inflow channel 121, and an outflow channel 122 are all formed on the valve body 120. The upper housing 110 is mounted on the upper part of the valve body 120. A protrusion 440, radially protruding outwards, is provided on the outer wall of the outer cylinder 430. The protrusion 440 is annular. When the first support member 400 is installed inside the valve body 100, the outer wall of the outer cylinder 430 abuts against the inner wall of the upper housing 110. The protrusion 440 passes under the upper housing 110, so that the protrusion 440 and the outer edge 230 are both located on the upper housing. Between the upper housing 110 and the valve body 120, with the protrusion 440 located above the outer edge 230, when the upper housing 110 is locked onto the valve body 120, the upper housing 110 and the valve body 120 together clamp the protrusion 440 and the outer edge 230, so that the protrusion 440 and the outer edge 230 are fixedly clamped between the upper housing 110 and the valve body 120, thereby realizing the installation and positioning of the diaphragm and the first support member 400, and facilitating the disassembly and assembly of the first support member 400 and the diaphragm. When the first support member 400 is damaged and needs to be repaired, it is convenient to disassemble and replace the first support member 400, thereby reducing maintenance costs.

[0070] Preferably, the outer cylinder 430 has a ventilation groove 432 with an opening facing the inner wall of the upper shell 110 on its outer side wall. The ventilation groove 432 is annular and surrounds the central axis of the first support member 400. The outer cylinder 430 also has a first ventilation hole 431 that penetrates the outer cylinder 430 so that the ventilation groove 432 communicates with the space above the deformable part 220. The upper shell 110 has a vent hole 111 that penetrates the upper shell 110 so that the ventilation groove 432 communicates with the outside. The space above the deformable part 220 is connected to the outside through the vent 431, the vent groove 432 and the breather hole 111, which can balance the air pressure in the space above the deformable part 220. When the deformable part 220 of the diaphragm deforms up and down, the space above the deformable part 220 can maintain pressure balance. At the same time, the setting of the annular vent groove 432 makes it unnecessary to precisely align the vent 431 and the breather hole 111 during installation. The breather hole 111 will always be aligned with the vent groove 432 when the upper housing 110 is rotated, thereby realizing the connection between the breather hole 111 and the vent 431, ensuring the connection between the space above the deformable part 220 and the outside, and reducing the assembly difficulty between the upper housing 110 and the valve body 120.

[0071] In this embodiment, the drive assembly can control the axial movement of the second support member 500 so that the bottom of the second support portion 510 (i.e., the end of the second support portion 510 near the deformation portion 220) extends to the lower side of the clearance gap 420 when the valve seat 123 is closed, so as to support the deformation portion 220, or the bottom of the second support portion 510 retracts into the clearance gap 420 when the valve seat 123 is open, so that the bottom of the first support portion 410 (i.e., the end of the first support portion 410 near the deformation portion 220) supports the deformation portion 220. In the structure described above, the outer cylinder 430 is fixed to the valve body 100. Throughout the entire process of the second support member 500 sliding with the valve stem 300, the second support member 500 in this embodiment never disengages from the clearance gap 420. That is, a portion of the second support part 510 is always located in the clearance gap 420. The clearance gap 420 limits the second support member 500 in the circumferential direction and guides it in the axial direction, thereby limiting the second support part 510. During the opening and closing of the valve, the second support part 510 restricts the circumferential rotation of the valve shaft 300 and the valve assembly, thereby preventing the diaphragm from twisting circumferentially.

[0072] Of course, it is understood that in other embodiments, the second support member 500 may also be located above the clearance gap 420 when the valve seat 123 is open. That is, when the valve seat 123 is open, the second support member 500 is disengaged from the clearance gap 420. During the process of the valve seat 123 switching from the open state to the closed state, the second support member 500 moves from above the clearance gap 420 to inside the clearance gap 420, and finally, when the valve seat 123 is closed, the bottom of the second support member 500 extends to the lower side of the clearance gap 420 to support the deformable part 220. Furthermore, in other embodiments, the structures of the first support member and the second support member may also be similar to... Figure 5-9 The structures may differ; for example, the first or second support part can be a rod-shaped structure.

[0073] Furthermore, the clearance gap 420 is made larger than the size of the second support portion 510, so that the second support portion 510 and the first support portion 410 are provided with a clearance fit. When the second support portion 510 slides within the clearance gap 420, the width of the clearance gap 420 is greater than the width of the second support portion 510, which can form gaps between the two sides of the second support portion 510 and the first support portion 410, so as to minimize the relative friction between the first support portion 410 and the second support portion 510 during the sliding process and avoid the generation of debris and dust due to friction. This also avoids the situation where the deformable portion 220 is easily damaged locally due to the pressing of debris and dust when it comes into contact with the second support portion 510 or the first support portion 410. When the separating diaphragm 240 is provided, debris and dust enter between the separating diaphragm 240 and the deformation part 220, causing friction between the two when the valve is opened and closed, which can easily cause the separating diaphragm 240 and the deformation part 220 to wear and be damaged, or cause debris and dust to be pressed between them and be damaged.

[0074] In this embodiment, the valve assembly further includes a separating diaphragm 240, which is located below the first support member 400 and the second support member 500, and above the deformable portion 220. When the deformable portion 220 is supported by the first support member 400, the separating diaphragm 240 is pressed between the deformable portion 220 and the first support member 400. When the deformable portion 220 is supported by the second support member 500, the separating diaphragm 240 is pressed between the deformable portion 220 and the second support member 500. That is, the first support member 400 and the second support member 500 do not directly contact the deformable portion 220 to support it. The deformable part 220 is supported by a sheet-like separating diaphragm 240. When the deformable part 220 is pressed against the separating diaphragm 240 by the fluid pressure in the valve cavity 124, the separating diaphragm 240 can disperse the supporting force applied to the deformable part 220 by the first supporting part 410 or the second supporting part 510, thereby making the pressure on the deformable part 220 more uniform and avoiding the supporting force from being concentrated at the position where the deformable part 220 contacts the first supporting part 410 or the second supporting part 510. This also avoids the deformable part 220 from having indentations or excessive stress concentration in a local position, which would cause the deformable part 220 to be over-deformed.

[0075] In this embodiment, the separator diaphragm 240 has a movable portion 242 and an outer portion 241. The movable portion 242 and the deformable portion 220 are arranged vertically opposite each other. The outer portion 241 is located on the outer periphery of the movable portion 242 and is arranged vertically opposite to the outer edge portion 230. When the protrusion 440 and the outer edge portion 230 are clamped between the upper housing 110 and the valve body 120, the outer portion 241 is clamped between the protrusion 440 and the outer edge portion 230. That is, the upper housing 110 and the valve body 120 jointly clamp the protrusion 440 of the first support member 400, the outer portion 241 of the separator diaphragm 240 and the outer edge portion 230 of the diaphragm. By clamping and fixing the outer periphery of the separator 240, it is easy to disassemble and assemble, while restricting the movement of the separator 240. When the separator 240 is compressed, its outer part 241 is clamped and fixed, which can prevent the outer part 241 from moving inward to the inner side of the separator 240, thereby preventing the separator 240 from being recessed into the clearance gap 420. This avoids the situation where the separator 240 cannot fully support the deformed part 220 at the clearance gap 420 due to the separator 240 being recessed into the clearance gap 420.

[0076] When the valve seat 123 is in the open state and there is no internal fluid pressure (the pressure inside the valve body is the same as the external atmospheric pressure), the separator diaphragm 240 naturally has a first state with its inner side bulging upward (that is, when there is no external force, the separator diaphragm 240 can stably maintain this state). In the first state, there is a gap between the movable part 242 of the separator diaphragm 240 and the bottom wall of the first support part 410. In the first state, the separator diaphragm 240 is not completely attached to the first support member 400, and the separator diaphragm 240 itself is in a tensioned state. In this state, the separator diaphragm 240 can provide a certain support force for the deformable part 220. In actual use, the fluid pressure causes the deformable part 220 and the separating diaphragm 240 to deform further upwards. This allows the separating diaphragm 240 to further adhere to the first support member 400, further tightening it. In this tightened state, the separating diaphragm 240 has a large tension force, making it difficult for it to deform into the clearance gap 420. This ensures that the separating diaphragm 240 provides good support at the clearance gap 420. In other words, it enhances the support effect of the separating diaphragm 240 on the deformable part 220, allowing it to better support the deformable part 220 and distribute the supporting force.

[0077] In this embodiment, the vertical plane passing through the central axis of valve stem 300 is used as the cross-section, as shown in the cross-sectional diagram below. Figure 4As shown, over the same radial length, the length of the cross section of the deformable part 220 cut by the vertical plane is greater than the length of the cross section of the movable part 242 cut by the vertical plane. Here, the length of the cross section refers to the length of the outline of the deformable part 220 and the movable part 242 cut by the cross section. That is, over the same radial length, the overall area of ​​the diaphragm deformable part 220 is greater than the overall area of ​​the movable part 242 of the separating diaphragm 240. When the deformable part 220 is subjected to fluid pressure, both the movable part 242 and the deformable part 220, which are opposite to the clearance gap 420, will be recessed into the clearance gap 420. By setting the length of the cross section of the movable part 242 cut by the vertical plane to be smaller than the length of the cross section of the deformable part 220 cut by the vertical plane, the deformable area of ​​the movable part 242 is smaller than the deformable area of ​​the deformable part 220. When the movable part 242 is recessed into the clearance gap 420 and is tensioned, the deformable part 220 is not yet in a tensioned state and is blocked by the tensioned movable part 242, so it cannot continue to recess into the clearance gap 420. This avoids the deformable part 220 from being excessively recessed into the clearance gap 420, which would cause the deformable part 220 to be over-deformed and damaged.

[0078] The separating diaphragm 240 also has an inner portion 243, which is located inside the movable portion 242, such as... Figure 4 As shown, the inner portion 243 and the movable portion 242 are separated by the dotted line in the figure. A movable gap 250 is provided between the valve core 210 and the second support member 500. The inner portion 243 is entirely or partially located within the movable gap 250. The thickness of the inner portion 243 is less than the height of the movable gap 250, so that the inner portion 243 can move along the axial direction of the valve stem 300 within the movable gap 250. The movable gap 250 can improve the deformability of the separating diaphragm 240. When the length of the cross section of the movable portion 242 cut by the vertical plane is less than the length of the cross section of the deformable portion 220 cut by the vertical plane, the movable diaphragm 240 in a taut state can move within the movable gap 250 to achieve its fit with the first support member 410 or the second support member 510, ensuring that the separating diaphragm 240 effectively disperses the supporting force and provides better support for the deformable portion 220. At the same time, it avoids the situation where the inner and outer sides of the separating diaphragm 240 are both fixed, and when it deforms and comes into contact with the first support part 410 or the second support part 510, the deformation of the movable part 242 is entirely dependent on the deformation of the movable part 242, which may cause the movable part 242 to easily deform excessively.

[0079] In this preferred embodiment, the circumferential widths of the first support portion 410 and the second support portion 510 both increase radially from the inside to the outside along the valve stem 300. That is, the circumferential widths of the first inclined surface 411 and the second inclined surface 511 both increase radially from the center axis to the outside periphery along the valve stem 300. This results in a larger support area for the deformation portion 220 as the first support portion 410 and the second support portion 510 are closer to the outer periphery. Since the fluid pressure on the outside of the deformation portion 220 is greater, increasing the support area of ​​the outer periphery of the first support portion 410 and the second support portion 510 for the deformation portion 220 can effectively prevent excessive force on the outside of the deformation portion 220 and extend the service life of the diaphragm deformation portion 220. Of course, it is understood that in this embodiment, the circumferential width of the first support portion 410 may be set to increase radially from the inside to the outside along the valve stem 300, or the circumferential width of the second support portion 510 may be set to increase radially from the inside to the outside along the valve stem 300.

[0080] Example 2:

[0081] like Figure 13 and Figure 14 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the first inclined surface 411 and the second inclined surface 511 have the same inclination direction, and both are inclined in the direction away from the valve stem, that is, the outer side is lower and the inner side is higher. This situation is applicable to the case where the deformable part 220 is always lower on the outer side and higher on the inner side during the up and down movement of the diaphragm.

[0082] In this embodiment, the slope of the first inclined plane 411 is greater than the slope of the second inclined plane 511. When the valve seat is in the closed state, such as Figure 13 As shown, the bottom of the second support portion 510 extends out through the partition gap, supporting the deformable portion 220 and creating a height difference H between the outer side of the bottom wall of the first support portion (i.e., the first inclined surface 411) and the outer side of the bottom wall of the second support portion (i.e., the second inclined surface 511); when the valve seat is in the open state, as Figure 14 As shown, the bottom of the second support portion 510 no longer extends out of the partition gap, and the deformation portion 220 is supported by the first support portion 410 so that a height difference H is formed between the inner side of the first inclined surface 411 and the inner side of the second inclined surface 511.

[0083] Example 3:

[0084] like Figure 15 and Figure 16 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the first inclined surface 411 and the second inclined surface 511 have the same inclination direction and both are inclined toward the valve stem, that is, the outer side is higher than the inner side. This situation is applicable to the case where the deformable part 220 is always higher on the outer side and lower on the inner side during the up and down movement of the diaphragm.

[0085] In this example, the slope of the first inclined plane 411 is less than the slope of the second inclined plane 511. When the valve seat is in the closed state, as... Figure 15 As shown, the bottom of the second support portion 510 extends out through the partition gap, so that a height difference H is formed between the outer side of the bottom wall (i.e., the first inclined surface 411) of the first support portion 410 and the outer side of the bottom wall (i.e., the second inclined surface 511) of the second support portion 510; when the valve seat is in the closed state, as Figure 16 As shown, the bottom of the second support 510 no longer extends out of the partition gap, so that the inner side of the second inclined surface 511 and the inner side of the first inclined surface 411 form a height difference H.

[0086] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A diaphragm valve, comprising: A valve body having an inflow channel, an outflow channel, and a valve seat for fluid to pass through, the valve seat being used to connect the inflow channel and the outflow channel; A valve assembly includes a valve core, a deformable portion surrounding the outside of the valve core, and an outer edge portion located outside the deformable portion, the outer edge portion being sealed and fixed to a valve body; The drive assembly includes a valve stem connected to the valve core, through which the axial movement of the valve core can be controlled to open or close the valve seat. It is characterized in that The diaphragm valve also includes a first support and a second support, both of which are located on the side of the valve assembly away from the valve seat. The first support member is axially fixed in the valve body, and the second support member is axially movable in the valve body; The drive assembly can drive the axial movement of the second support member to change the relative position of the first support member and the second support member; so that when the valve seat is open, the first support member can support the deformed part, and when the valve seat is closed, the second support member can support the deformed part.

2. A diaphragm valve according to claim 1, characterized in that: The first support member has a first support portion for supporting the deformed portion, and the second support member has a second support portion for supporting the deformed portion; Specifically, when the valve seat is open, there is a height difference between the outer side of the bottom wall of the first support part and the outer side of the bottom wall of the second support part; when the valve seat is closed, there is a height difference between the inner side of the bottom wall of the first support part and the inner side of the bottom wall of the second support part.

3. A diaphragm valve according to claim 2, characterized in that: The first support portion and the second support portion are multiple, and a clearance gap is provided between adjacent first support portions. The multiple second support portions move axially in each clearance gap.

4. A diaphragm valve according to claim 3, characterized in that: The bottom surface of the first support part is a symmetrical structure. In the horizontal plane projection, the projection of the clearance gap on both sides of the bottom surface of the first support part is symmetrical about the axis of symmetry of the projection of the bottom surface of the first support part; and / or, a separation gap is formed between two adjacent second support parts. The bottom surface of the second support part is a symmetrical structure. In the horizontal plane projection, the projection of the separation gap on both sides of the bottom surface of the second support part is symmetrical about the axis of symmetry of the projection of the bottom surface of the second support part.

5. A diaphragm valve according to claim 4, characterized in that: Multiple first support portions and multiple clearance gaps are evenly distributed around the valve stem in a circumferential direction.

6. A diaphragm valve according to claim 3, characterized in that: The drive assembly controls the axial movement of the second support member to allow the bottom of the second support part to extend to the lower side of the clearance gap, or for the bottom of the second support part to retract into the clearance gap or to the upper side of the clearance gap.

7. A diaphragm valve according to claim 2, characterized in that: The first support member includes an outer cylinder, and the first support portion extends radially inward from the inner wall of the outer cylinder; The second support member includes an inner cylinder fixed to the valve stem, and a plurality of second support portions extend radially outward from the outer wall of the inner cylinder.

8. A diaphragm valve according to claim 3 or 6, characterized in that: The valve body includes a valve body with the valve seat and an upper housing mounted on the valve body. The first support member also has a radially outward protrusion. The protrusion and the outer edge are fixedly clamped between the valve body and the upper housing. During the movement of the valve stem, a portion of the second support is always located in the clearance gap.

9. A diaphragm valve according to any one of claims 2-7, characterized in that: The valve assembly also includes a separator diaphragm located on the upper side of the deformable portion, which is pressed between the deformable portion and the first or second support member when the deformable portion is supported.

10. A diaphragm valve according to claim 9, characterized in that: The separating diaphragm has a movable portion opposite to the deformable portion and an outer portion located outside the movable portion, wherein the outer portion is clamped and fixed between the outer edge portion and the first support portion.

11. A diaphragm valve according to claim 10, characterized in that: The separator diaphragm has a first state in which the inner side bulges upward in its natural state. In the first state, a gap is provided between the movable part and the bottom wall of the first support part.

12. A diaphragm valve according to claim 10, characterized in that: Let the vertical plane passing through the central axis of the valve stem be the cross section. Over the same radial length, the length of the cross section intercepted by the vertical plane on the deformed part is greater than the length of the cross section intercepted by the vertical plane on the movable part.

13. A diaphragm valve according to claim 12, characterized in that: A movable gap is provided between the valve core and the second support member. The separator diaphragm has an inner portion located inside the movable part. The inner portion is at least partially located in the movable gap, and the height of the movable gap is greater than the thickness of the inner portion.

14. A diaphragm valve according to claim 2, characterized in that: The valve seat in the open state has a deformable part that is higher on the inside and lower on the outside. The bottom surface of the first support part is a first inclined surface for abutting the deformable part. The first inclined surface is inclined toward the valve stem. The valve seat in the closed state has a deformable part that is lower on the inside and higher on the outside. The bottom surface of the second support part is a second inclined surface for abutting the deformable part. The second inclined surface is inclined in the direction away from the valve stem.

15. A diaphragm valve according to claim 14, characterized in that: The second inclined surface extends radially outward and includes an inclined support surface and a smooth transition surface located radially outside the inclined support surface and closer to the horizontal plane.

16. A diaphragm valve according to claim 3, characterized in that: The clearance dimension is larger than the dimension of the second support portion, so that the second support portion and the first support portion are fitted together with a clearance.

17. A diaphragm valve according to claim 2, characterized in that: The circumferential width of the bottom surface of the first support part and / or the bottom surface of the second support part is increased outward along the radial direction of the valve stem.

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