Diaphragm valve

Abstract

The invention discloses a diaphragm valve, which comprises a valve main body, a valve core and a diaphragm, an upper housing; a diaphragm assembly; a pushing assembly; the diaphragm assembly comprises a first diaphragm and a second diaphragm which are arranged in a stacked mode, the second diaphragm is arranged on the side, away from the valve seat, of the first diaphragm, and the outer edges of the first diaphragm and the second diaphragm are clamped between the valve body and the upper shell. According to the invention, the first diaphragm and the second diaphragm are stacked, and the diaphragm assembly is arranged into a structure with double layers of diaphragms, so that the overall strength of the diaphragm assembly can be ensured under the condition of reducing the thickness of each diaphragm, the two diaphragms are softer by reducing the thickness of each diaphragm, and the deformation quantity of a single diaphragm can be increased; the first diaphragm with the large deformation quantity can control the flow of liquid flowing through the valve seat by changing the deformation quantity, and the first diaphragm can be tightly attached to the valve seat through sufficient deformation when the valve seat is closed, so that the sealing effect between the first diaphragm and the valve seat is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a diaphragm valve. Background Art

[0002] A diaphragm valve is a special valve that can open or close a fluid channel or adjust the liquid delivery volume of a fluid channel in an open state by moving or deforming the diaphragm. It is widely used in pipelines for transmitting high-purity media such as ultrapure water.

[0003] At present, the diaphragm valves on the market use a single-layer diaphragm for opening and closing, which has the following disadvantages: if the diaphragm is set to be thinner, the diaphragm will be too soft and have low strength. When the diaphragm closes the valve seat, the diaphragm is very likely to deform under the impact of liquid with high water pressure, resulting in the diaphragm valve being unable to seal. At the same time, excessive pressure deformation will cause the diaphragm to easily produce plastic deformation and have a short lifespan; if the diaphragm is set to be thicker, although the diaphragm is not easy to deform under the impact of water flow, the stroke of the diaphragm when opening and closing is sacrificed, resulting in a smaller opening amount of the valve port, which in turn affects the flow rate of the diaphragm valve. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a diaphragm valve suitable for high fluid pressure and large flow, so as to solve the problems of small diaphragm opening stroke, easy plastic deformation and poor effect when the valve is closed.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a diaphragm valve, comprising: a valve body, which has an inflow channel, an outflow channel and a valve seat for fluid to pass through, and the valve seat is used to connect the inflow channel and the outflow channel; an upper shell connected to the upper end of the valve body; a diaphragm assembly, used to open and close the valve seat; a pushing assembly, located on the side of the diaphragm assembly away from the valve seat, and slidably connected in the upper shell and connected to the diaphragm assembly, so as to drive the diaphragm assembly to block or open the valve seat through reciprocating motion; the diaphragm assembly includes a first diaphragm and a second diaphragm arranged in a stacked manner, the second diaphragm is arranged on the side of the first diaphragm away from the valve seat, and the outer edges of the first diaphragm and the second diaphragm are clamped between the valve body and the upper shell. This technical solution has the following technical effects:

[0006] The present invention arranges the diaphragm assembly into a structure with a double-layer diaphragm by stacking the first diaphragm and the second diaphragm. The combination of the double-layer diaphragms can ensure the overall strength of the diaphragm assembly while reducing the thickness of each diaphragm. By reducing the thickness of each diaphragm, the two diaphragms are made softer, and the deformation of a single diaphragm can be increased. In particular, the first diaphragm used for direct contact with the valve seat. The first diaphragm with a large elastic deformation can control the flow rate of the liquid flowing through the valve seat through deformation. The first diaphragm can also fit tightly with the valve seat when the valve seat is closed through sufficient deformation to ensure the sealing effect between the first diaphragm and the valve seat. By arranging the second diaphragm on the side of the first diaphragm away from the valve seat, the second diaphragm can support and protect the first diaphragm to prevent the first diaphragm from being damaged by pressure due to being too thin. When the first diaphragm closes the valve seat, even if the high-pressure liquid impacts the soft first diaphragm in the direction away from the valve seat, the first diaphragm can maintain a seal with the valve seat under the support and blocking action of the second diaphragm, avoiding the first diaphragm from being deformed by the impact of the high-pressure liquid and opening the valve seat. It is safer and more reliable when transmitting corrosive liquids. When it is necessary to adjust the liquid flow through the diaphragm valve, the flow through the valve seat can be adjusted by respectively changing the deformation of the first diaphragm and the second diaphragm. The second diaphragm can keep the first diaphragm at the set deformation to ensure the stability of the flow through the diaphragm valve and improve the user experience. When the diaphragm valve switches between open and closed states, the first diaphragm will also be impacted by the high-pressure fluid in the fluid channel. During this process, the second diaphragm can also provide support for the first diaphragm on the side away from the valve seat; combined with the non-integrated setting of the inner sides of the first diaphragm and the second diaphragm, the first diaphragm and the second diaphragm can move relatively independently when switching between open and closed states, thereby achieving the first diaphragm being able to withstand the high-pressure fluid while satisfying the larger movement stroke of the first diaphragm and the second diaphragm.

[0007] In the above-mentioned diaphragm valve, the first diaphragm includes a central area, an installation area for clamping between the upper shell and the valve body, and a deformation area between the central area and the installation area; the pushing component includes a pushing member and a driving member, and the pushing member pushes the second diaphragm to make the first diaphragm close to the valve seat. By setting the first diaphragm into a structure of a central area, a deformation area and an installation area, and clamping the installation area between the upper shell and the valve body, the first diaphragm can be stably sealed with the valve body on the periphery of the valve seat through the installation area, and at the same time, the first diaphragm can be stably deformed through the central area and the deformation area to close or adjust the flow of the valve seat. The pushing member does not push the first diaphragm to deform by directly contacting the first diaphragm, but pushes the second diaphragm to deform, and then deforms under the push of the deformed second diaphragm, that is, the pushing component does not need to set a structure directly connected to the first diaphragm to achieve control of the deformation of the first diaphragm, simplifying the connection structure and reducing the difficulty of production, processing and assembly. On the other hand, by pushing the first diaphragm to deform through the deformable second diaphragm, the fit between the second diaphragm and the first diaphragm can be increased, ensuring the supporting performance of the second diaphragm for the first diaphragm and avoiding transitional deformation and damage of the first diaphragm due to local lack of support.

[0008] In the above-mentioned diaphragm valve, the pusher has a first abutting surface and a second abutting surface located radially inside the first abutting surface; wherein the first abutting surface is arranged corresponding to the deformation area, and the second abutting surface is arranged corresponding to the central area. The two different abutting surfaces of the pusher respectively push different positions of the second diaphragm, and then respectively push the central area and the deformation area of ​​the first diaphragm to deform, so that the central area and the deformation area of ​​the first diaphragm are deformed to different degrees, so that the first diaphragm fits tightly with the valve seat when the valve seat is closed, thereby ensuring the sealing between the first diaphragm and the valve seat.

[0009] In the above-mentioned diaphragm valve, the second diaphragm has an inner area, and the second abutting surface presses the inner area to make the central area close to the valve seat; wherein the lower end surface of the inner area is contoured to the upper end surface of the axially corresponding area of ​​the first diaphragm, and the outer boundary of the horizontal projection of the inner area is located on the deformation area. The lower end surface of the inner area is shaped like the upper end surface of the axially corresponding area of ​​the first diaphragm and the lower end surface of the inner area, so that the position of the second diaphragm for deformation can better fit the first diaphragm when the valve seat is opened. Even if the pusher moves a small distance, the second diaphragm can timely transfer slight deformation to the first diaphragm to achieve the adjustment of the size of the valve opening, thereby achieving precise adjustment of the flow rate of the diaphragm valve. The outer boundary of the positive projection of the inner area in the horizontal plane direction is located on the deformation area, so that the inner area can enhance the strength of the central area and the deformation area of ​​the first diaphragm by supporting the central area and the deformation area; by locating the outer boundary of the horizontal projection of the inner area on the deformation area combined with the above-mentioned shaped setting, when the first diaphragm closes the valve seat, the sealing between the central area of ​​the first diaphragm, the connection between the deformation area and the valve seat can be enhanced.

[0010] In the above-mentioned diaphragm valve, the second diaphragm also has an outer region located outside the inner region, and the upper end surface of the inner region is axially protruded from the outer region so that the thickness of the inner region is greater than that of the outer region. By setting the second diaphragm to a structure in which the thickness of the inner region is greater than that of the outer region, the inner region of the second diaphragm has a larger absolute deformation amount. In the process of the second diaphragm pushing the first diaphragm to deform to close the valve seat, if the central region of the first diaphragm has abutted against and sealed with the valve seat and the deformed region has not yet sealed with the valve seat, the inner region with a large absolute deformation amount can be further compressed and deformed under the extrusion of the pusher, so that the deformed region of the first diaphragm is also sealed with the valve seat, and when the diaphragm closes the valve seat, the sealing between the diaphragm assembly and the valve seat is improved.

[0011] In the above-mentioned diaphragm valve, the push assembly further includes a connecting member slidably connected to the push member, and the connecting member is set with a gap with the driving member when the valve seat is in a sealed state and is directly fixed to the central area. During the entire pushing process of the push member, because the connecting member and the driving member are set with a gap, the connecting member will not exert a force on the first diaphragm to move toward the valve seat along the axial direction of the push assembly, and the connecting member only limits the first diaphragm along the radial direction of the push assembly to ensure the stability of the position of the first diaphragm in the horizontal direction, thereby ensuring the precise alignment of the first diaphragm and the second diaphragm, so that the second diaphragm can stably drive the deformation of various parts of the first diaphragm.

[0012] In the above-mentioned diaphragm valve, the push assembly also includes a connecting member, and the pushing member has a first abutting surface; wherein the first abutting surface presses the second diaphragm to make the deformation area close to the valve seat; the connecting member is directly fixed to the central area to drive the central area close to the valve seat. The pushing assembly directly drives the central area of ​​the first diaphragm to deform, so that the central area of ​​the first diaphragm can be relatively rigidly sealed on the valve seat, and the sealing effect can be more stable; at the same time, since the deformation area is integrally arranged on the radial outer side of the central area, such an arrangement can improve the stability of the deformation area, so that the deformation area can still maintain a sealing abutment with the valve seat after being impacted by liquid.

[0013] In the above-mentioned diaphragm valve, the connecting member is provided with a gap with the driving member when the valve seat is in the maximum open state, and is provided in abutment with the driving member when the valve seat is closed. The connecting member is provided with a gap with the driving member when the valve seat is in the maximum open state, so that the first diaphragm can move toward the second diaphragm to increase the flow channel volume when the liquid pressure is high, and move toward the valve seat to reduce the flow channel volume when the liquid pressure is low, thereby playing a role in stabilizing pressure; the connecting member is provided in abutment with the driving member when the valve seat is closed, at this time, the driving member can limit the central area of ​​the first diaphragm through the connecting member, so that under the impact of high-pressure liquid, the central area of ​​the first diaphragm can still maintain a close fit with the valve seat, and the sealing effect is good.

[0014] In the above-mentioned diaphragm valve, when the valve seat is in a sealed state, there is a gap between the central area and the second diaphragm. The setting of the gap prevents the second diaphragm from contacting the central area, and the driving force exerted on the second diaphragm is fully transmitted to the deformation area of ​​the first diaphragm, so that the sealing effect between the first diaphragm and the valve seat is better.

[0015] In the above-mentioned diaphragm valve, the pusher has an axially extending slide groove inside, and the driving member defines the top of the slide groove; the connecting member has a sliding portion and a rod portion extending downward from the sliding portion to connect with the central area of ​​the first diaphragm; wherein the sliding portion is connected to the slide groove in a sliding cooperation manner. The driving member can abut against the top of the connecting member to drive the first diaphragm to deform through the connecting member, and at the same time, the cooperation between the sliding portion and the slide groove enables the pusher to limit the rod portion in the horizontal direction through the slide groove, thereby ensuring that the position of the central area of ​​the first diaphragm does not change radially, and ensuring the stable opening and closing of the first diaphragm to the valve seat.

[0016] In the above-mentioned diaphragm valve, a mounting groove is provided in the central area of ​​the first diaphragm; the connecting member further comprises a positioning protrusion arranged around the rod, and the positioning protrusion is embedded in the mounting groove; wherein the inner diameter of the notch of the mounting groove is smaller than the outer diameter of the positioning protrusion, so as to axially limit the connecting member, thereby preventing the connecting member from being disengaged from the first diaphragm in the axial direction and ensuring a stable connection between the connecting member and the first diaphragm.

[0017] In the above-mentioned diaphragm valve, when the valve seat is in the maximum open state, there are a first vertical section and a second vertical section perpendicular to the extension direction of the valve seat, wherein the first vertical section cuts the slide groove, the sliding part and the central area, and the axial spacing between the top of the slide groove and the valve seat on the first vertical section is a, and the axial spacing between the highest point of the sliding part and the lowest point of the central area is b; the second vertical section cuts the first abutting surface, and the axial spacing between the first abutting surface and the valve seat on the second vertical section is c, and the thicknesses of the second diaphragm and the first diaphragm are d and e respectively; then: ab>cde. In the process of switching the valve seat from the maximum open state to the sealed closed state, the deformation area will be sealed with the valve seat first, and then the central area will be sealed with the valve seat, avoiding the situation that the central area is sealed with the valve seat but the deformation area has not yet been sealed with the valve seat, and the sealing effect is good.

[0018] In the above-mentioned diaphragm valve, a through hole is provided on the second diaphragm for the rod to pass through, and a gap is provided between the rod and the through hole to prevent the rod from affecting the deformation of the first diaphragm and the second diaphragm respectively.

[0019] In the above-mentioned diaphragm valve, the deformation area has an umbrella-shaped segment that is higher inside and lower outside in the radial extension direction, and the umbrella-shaped segment slides radially outward when the valve seat is switched from the maximum open state to the sealing state. When the valve seat is switched from the maximum open state to the sealing state, the umbrella-shaped segment is deformed to change from bulging upward to bulging downward. In this process, the umbrella-shaped segment slides radially outward, that is, the umbrella-shaped segment can move radially relative to the second diaphragm, so that the first diaphragm and the second diaphragm fit more closely and the sealing effect is better.

[0020] In the above-mentioned diaphragm valve, when the valve seat is in the maximum open state, the deformation area has a support protrusion that is arched toward the second diaphragm, and the first diaphragm and the second diaphragm form a gap on the radial inner side and / or radial outer side of the support protrusion. The gap formed by the support protrusion between the first diaphragm and the second diaphragm allows the first diaphragm to deform slightly toward the gap, thereby allowing the first diaphragm to stabilize the pressure of the liquid when the liquid flows through the diaphragm assembly, and the flow of the liquid is smoother. When the diaphragm valve switches between the open and closed states, the setting of the gap can reduce the relative friction between the first diaphragm and the second diaphragm, prevent excessive wear between the first diaphragm and the second diaphragm, and extend the service life of the first diaphragm and the second diaphragm.

[0021] In the above-mentioned diaphragm valve, when the valve seat is in the maximum open state, the axial distance between the pusher and the second diaphragm gradually increases from the inside to the outside; and / or the axial distance between the umbrella-shaped section and the second diaphragm gradually increases from the inside to the outside. When the pusher pushes the second diaphragm to deform, the second diaphragm can be pressed against the first diaphragm from the inside to the outside, so that the deformation area slides radially outward, so that the first diaphragm and the second diaphragm fit more closely and the sealing effect is better.

[0022] In the above-mentioned diaphragm valve, the first diaphragm has a first sealing rib arranged in an annular manner, and the first sealing rib has an inner side and an outer side; the angle between the inner side and the horizontal plane is smaller than the angle between the outer side and the horizontal plane. The first sealing rib can fill the gap between the first diaphragm and the valve body by abutting against the valve body, thereby enhancing the sealing between the first diaphragm and the valve body. The angle between the inner side of the first sealing rib and the horizontal plane is smaller than the angle between the outer side and the horizontal plane, thereby enhancing the strength of the first sealing rib, thereby preventing the first sealing rib from being deformed outward due to the impact of the high-pressure liquid at the valve port and being unable to seal with the valve body, thereby improving the sealing effect between the first sealing rib and the valve body.

[0023] In the above-mentioned diaphragm valve, the valve body has a first anti-skid rib protruding toward the first diaphragm, the first diaphragm has a first anti-skid groove matched with the first anti-skid rib; the height of the first anti-skid rib is greater than the depth of the first anti-skid groove; and / or; the first diaphragm has a second anti-skid rib protruding toward the second diaphragm, the second diaphragm has a second anti-skid groove matched with the second anti-skid rib; the height of the second anti-skid rib is greater than the depth of the second anti-skid groove. When the upper shell and the valve body clamp the diaphragm assembly together, the first anti-skid rib is inserted into the first anti-skid groove, the cooperation between the first anti-skid rib and the first anti-skid groove increases the abutment area between the diaphragm assembly and the first anti-skid rib, and enhances the sealing effect between the first diaphragm and the valve body, the height of the first anti-skid rib is greater than the depth of the first anti-skid groove, so that the first anti-skid groove can only be set on the upper half of the first anti-skid rib, the insertion is tighter, and the depth of the first anti-skid groove is greater than the height of the first anti-skid rib, which causes a gap between the first anti-skid groove and the first anti-skid rib, so that the sealing effect between the first anti-skid groove and the first anti-skid rib is good. When the upper shell and the valve body clamp the diaphragm assembly together, the second anti-skid rib is inserted into the second anti-skid groove to limit the installation of the first diaphragm and the second diaphragm in the horizontal direction, which is convenient for the rapid assembly of the first diaphragm and the second diaphragm, and increases the friction between the first diaphragm and the second diaphragm to avoid the edge of the first diaphragm from slipping out from between the valve body and the second diaphragm when the first diaphragm is deformed, thereby ensuring the seal between the first diaphragm and the valve body. The height of the second anti-skid rib is greater than the depth of the second anti-skid groove, so that the second anti-skid groove can only be set on the upper half of the second anti-skid rib, and the insertion is tighter, so that the sealing effect between the second anti-skid groove and the second anti-skid rib is good.

[0024] In the above-mentioned diaphragm valve, the hardness of the second diaphragm is less than that of the first diaphragm; and / or, the strength of the second diaphragm is greater than that of the first diaphragm; and / or, the thickness of the second diaphragm is greater than that of the first diaphragm; and / or, the first diaphragm is a PTFE membrane and the second diaphragm is an EPDM membrane. The second diaphragm is less likely to deform than the first diaphragm, so that the second diaphragm can support the first diaphragm, thereby making the first diaphragm have a better closing effect on the valve port, improving the sealing performance, and preventing the first diaphragm from opening the valve port under the impact of high-pressure liquid.

[0025] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0027] Figure 1 is a three-dimensional diagram of the diaphragm valve in Example 1;

[0028] Figure 2 It is a cross-sectional schematic diagram of the valve body in the first embodiment;

[0029] Figure 3 is an exploded view of the diaphragm valve in Example 1;

[0030] Figure 4 is a cross-sectional view of the diaphragm valve when the valve seat is in the maximum open state in the first embodiment;

[0031] Figure 5 is a cross-sectional view of the diaphragm valve when the valve seat is in a sealed closed state in the first embodiment;

[0032] Figure 6 It is a schematic diagram of the assembly of the drive assembly and the diaphragm assembly in the first embodiment;

[0033] Figure 7 is a cross-sectional view of the first diaphragm and the connecting member in the first embodiment;

[0034] Figure 8 is a cross-sectional view of the second diaphragm in Example 1;

[0035] Fig. 9 It is a partial cross-sectional view of the diaphragm valve in Example 1;

[0036] Fig.10 It is a partial cross-sectional view of the diaphragm valve when the valve seat is in the maximum open state in the first embodiment;

[0037] Fig.11 It is a cross-sectional schematic diagram of the diaphragm valve in Example 3.

[0038] Reference numerals:

[0039] 100, valve body; 110, inflow channel; 120, outflow channel; 130, valve seat; 131, water retaining platform; 132, annular weir; 140, first anti-slip rib; 150, cavity;

[0040] 200, upper shell;

[0041] 300, diaphragm assembly;

[0042] 400, first diaphragm; 410, central area; 411, mounting groove; 420, deformation area; 421, umbrella-shaped section; 422, supporting protrusion; 430, mounting area; 440, first sealing rib; 441, inner side; 442, outer side; 450, first anti-skid groove; 460, second anti-skid rib;

[0043] 500, second diaphragm; 510, inner area; 511, through hole; 520, outer area; 530, second anti-slip groove;

[0044] 600, pushing component; 610, driving member; 620, pushing member; 621, first abutting surface; 622, second abutting surface; 623, sliding groove; 630, connecting member; 631, sliding part; 632, rod part; 633, positioning protrusion. DETAILED DESCRIPTION

[0045] A diaphragm valve proposed in the present invention includes: a valve body, which has an inlet channel, an outflow channel and a valve seat for fluid to pass through, and the valve seat is used to connect the inlet channel and the outflow channel; an upper shell body, connected to the upper end of the valve body; a diaphragm assembly, used to open and close the valve seat; a pushing assembly, located on the side of the diaphragm assembly away from the valve seat, and slidably connected in the upper shell body and connected to the diaphragm assembly to drive the diaphragm assembly to block or open the valve seat through reciprocating motion; the diaphragm assembly includes a first diaphragm and a second diaphragm arranged in a stacked manner, the second diaphragm is arranged on the side of the first diaphragm away from the valve seat, and the outer edges of the first diaphragm and the second diaphragm are clamped between the valve body and the upper shell body. The present invention arranges the diaphragm assembly into a structure with a double-layer diaphragm by stacking the first diaphragm and the second diaphragm. The combination of the double-layer diaphragms can ensure the overall strength of the diaphragm assembly while reducing the thickness of each diaphragm. By reducing the thickness of each diaphragm, the two diaphragms are made softer, and the deformation of a single diaphragm can be increased. In particular, the first diaphragm used for directly contacting the valve seat. The first diaphragm with a larger deformation can control the liquid flow rate flowing through the valve seat by changing the deformation. The first diaphragm can also be fully deformed to fit tightly with the valve seat when the valve seat is closed, so as to ensure the sealing effect between the first diaphragm and the valve seat. By arranging the second diaphragm on the side of the first diaphragm away from the valve seat, the second diaphragm can support and protect the first diaphragm to prevent the first diaphragm from being damaged by pressure due to being too thin. When the first diaphragm closes the valve seat, even if the high-pressure liquid impacts the soft first diaphragm in the direction away from the valve seat, the first diaphragm can maintain a seal with the valve seat under the support and blocking action of the second diaphragm, avoiding the first diaphragm from being deformed by the impact of the high-pressure liquid and opening the valve seat. It is safer and more reliable when transmitting corrosive liquids. When it is necessary to adjust the liquid flow through the diaphragm valve, the flow through the valve seat can be adjusted by respectively changing the deformation of the first diaphragm and the second diaphragm. The second diaphragm can keep the first diaphragm at the set deformation to ensure the stability of the flow through the diaphragm valve and improve the user experience.

[0046] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] Embodiment 1:

[0052] A diaphragm valve, such as Figures 1 to 10 As shown, the valve body 100 includes a valve body 100, an upper housing 200, a diaphragm assembly 300 and a push assembly 600. The valve body 100 has an inflow channel 110, an outflow channel 120 and a valve seat 130 for fluid to pass through. The valve seat 130 is formed between the inflow channel 110 and the outflow channel 120 to connect the inflow channel 110 and the outflow channel 120. Figure 4 Taking the shown direction as an example, the diaphragm assembly 300 is located axially above the valve seat 130 for opening and closing the valve seat 130. The upper shell 200 is connected to the upper end of the valve body 100. The pushing assembly 600 is located on the side of the diaphragm assembly 300 away from the valve seat 130. The pushing assembly 600 is slidably connected in the upper shell 200. The bottom of the pushing assembly 600 is connected to the diaphragm assembly 300. The pushing assembly 600 can drive the diaphragm assembly 300 to block or open the valve seat 130 through reciprocating motion. When the valve seat 130 is opened, the liquid can flow from the inflow channel 110 into the outflow channel 120. When the valve seat 130 is closed, the liquid in the inflow channel 110 cannot enter the outflow channel 120. The diaphragm assembly 300 includes a first diaphragm 400 and a second diaphragm 500. The first diaphragm 400 and the second diaphragm 500 are stacked, and the second diaphragm 500 is arranged above the first diaphragm 400. The projections of the two on the horizontal plane overlap. The upper shell 200 and the valve body 100 clamp the outer edges of the first diaphragm 400 and the second diaphragm 500 at the same time to simultaneously install and limit the first diaphragm 400 and the second diaphragm 500.

[0053] The present invention arranges the diaphragm assembly 300 into a double-layer diaphragm structure by stacking the first diaphragm 400 and the second diaphragm 500. The combination of the double-layer diaphragms can ensure the overall strength of the diaphragm assembly 300 while reducing the thickness of each diaphragm. By reducing the thickness of each diaphragm, the two diaphragms are made softer, and the deformation of a single diaphragm can be increased, especially the first diaphragm 400 used to directly contact the valve seat 130. The first diaphragm 400 with a larger deformation can control the liquid flow rate flowing through the valve seat 130 by changing the deformation. The first diaphragm 400 can also be fully deformed to fit tightly with the valve seat 130 when closing the valve seat 130, so as to ensure the sealing effect between the first diaphragm 400 and the valve seat 130. By arranging the second diaphragm 500 on the side of the first diaphragm 400 away from the valve seat 130, the second diaphragm 500 can support and protect the first diaphragm 400 to prevent the first diaphragm 400 from being too thin and damaged by pressure. When the first diaphragm 400 closes the valve seat 130, even if the high-pressure liquid impacts the soft first diaphragm 400 in the direction away from the valve seat 130, the first diaphragm 400 can maintain the seal with the valve seat 130 under the support and blocking action of the second diaphragm 500, so as to prevent the first diaphragm 400 from being deformed by the impact of the high-pressure liquid and opening the valve seat 130. When transmitting corrosive liquids, it is safer and more reliable. When it is necessary to adjust the liquid flow through the diaphragm valve, the flow through the valve seat 130 can be adjusted by respectively changing the deformation of the first diaphragm 400 and the first diaphragm 400. The second diaphragm 500 can keep the first diaphragm 400 at the set deformation to ensure the stability of the flow through the diaphragm valve and improve the user experience. When the diaphragm valve switches between open and closed states, the first diaphragm 400 will also be impacted by the high-pressure fluid in the fluid channel. During this process, the second diaphragm 500 can also provide support for the first diaphragm 400 on the side away from the valve seat; combined with the non-integrated arrangement of the inner sides of the first diaphragm 400 and the second diaphragm 500, the first diaphragm 400 and the second diaphragm 500 can move relatively independently when switching between open and closed states, thereby achieving the first diaphragm 400 being able to withstand the high-pressure fluid while satisfying the larger movement stroke of the first diaphragm 400 and the second diaphragm 500.

[0054] like Figure 4 and Figure 5As shown, the first diaphragm 400 in this embodiment includes three areas, which are, from the center to the periphery, a central area 410, a deformation area 420 surrounding the periphery of the central area 410, and an installation area 430 surrounding the periphery of the deformation area 420. The installation area 430 of the first diaphragm 400 is clamped between the upper shell 200 and the valve body 100. The pushing assembly 600 includes a pushing member 620 and a driving member 610. The driving member 610 is used to drive the pushing member 620 to move up and down. The bottom of the pushing member 620 is connected to the second diaphragm 500. When the pushing member 620 moves toward the diaphragm assembly 300, the pushing member 620 pushes the second diaphragm 500 to deform in the direction of the first diaphragm 400. Under the push of the deformed second diaphragm 500, the central area 410 and the deformation area 420 of the first diaphragm 400 are close to the valve seat 130 to close the valve seat 130 or control the opening degree of the valve seat 130 to achieve flow regulation. By setting the first diaphragm 400 into a structure of a central area 410, a deformation area 420 and an installation area 430, and clamping the installation area 430 between the upper shell 200 and the valve body 100, the first diaphragm 400 can be stably sealed with the valve body 100 on the periphery of the valve seat 130 through the installation area 430, and at the same time, the first diaphragm 400 can be stably deformed through the central area 410 and the deformation area 420 to close or adjust the flow of the valve seat 130. The pusher 620 does not push the first diaphragm 400 to deform by directly contacting the first diaphragm 400, but pushes the second diaphragm 500 to deform, and then deforms under the push of the deformed second diaphragm 500, that is, the pusher assembly 600 does not need to set a structure directly connected to the first diaphragm 400, and can realize the control of the deformation of the first diaphragm 400, simplifying the connection structure, and reducing the difficulty of production, processing and assembly. On the other hand, by pushing the first diaphragm 400 to deform through the deformable second diaphragm 500, the fit between the second diaphragm 500 and the first diaphragm 400 can be increased, ensuring the supporting performance of the second diaphragm 500 for the first diaphragm 400 and avoiding transitional deformation and damage of the first diaphragm 400 due to local lack of support.

[0055] In this embodiment, the pusher 620 has a first abutting surface 621 and a second abutting surface 622. The second abutting surface 622 is located radially inward of the first abutting surface 621, that is, the second abutting surface 622 is located at the center of the pusher 620. The second abutting surface 622 corresponds to the central area 410 of the first diaphragm 400 in upper and lower directions. The first abutting surface 621 is arranged around the second abutting surface 622. The first abutting surface 621 corresponds to the deformation area 420 of the first diaphragm 400 in upper and lower directions. Figure 5As shown, when the pushing member 620 moves downward, the second abutting surface 622 of the pushing member 620 drives the central area 410 of the first diaphragm 400 to deform through the second diaphragm 500, and the first abutting surface 621 of the pushing member 620 drives the deformation area 420 of the first diaphragm 400 to deform through the second diaphragm 500. The two different abutting surfaces of the pushing member 620 push different positions of the second diaphragm 500 respectively, and then push the central area 410 and the deformation area 420 of the first diaphragm 400 to deform respectively, so that the central area 410 and the deformation area 420 of the first diaphragm 400 are deformed to different degrees, so that the first diaphragm 400 is tightly fitted with the valve seat 130 when closing the valve seat 130, thereby ensuring the sealing between the first diaphragm 400 and the valve seat 130.

[0056] The second diaphragm 500 has an inner region 510 and an outer region 520, and the outer region 520 surrounds the outer circumference of the inner region 510. Figure 5As shown, when the second abutting surface 622 of the pusher 620 presses the inner area 510 of the second diaphragm 500, the inner area 510 of the second diaphragm 500 is deformed downward to push the central area 410 of the first diaphragm 400 close to the valve seat 130. The lower end surface of the inner area 510 and the upper end surface of the axial corresponding area of ​​the first diaphragm 400 are configured to conform to the position of the second diaphragm 500 for deformation and the first diaphragm 400 when the valve seat 130 is opened. Even if the pusher 620 moves a small distance, the second diaphragm 500 can timely transmit the slight deformation to the first diaphragm 400 to achieve the valve. The size of the opening can be adjusted to achieve precise adjustment of the flow rate of the diaphragm valve. The outer boundary of the positive projection of the inner area 510 in the horizontal plane direction is located on the deformation area 420, so that the inner area 510 can enhance the strength of the central area 410 and the deformation area 420 of the first diaphragm 400 by supporting the central area 410 and the deformation area 420; by locating the outer boundary of the horizontal projection of the inner area on the deformation area 420 and combining with the above-mentioned profiling setting, when the first diaphragm 400 closes the valve seat 130, the sealing between the connection between the central area 410 and the deformation area 420 of the first diaphragm 400 and the valve seat 130 can be enhanced. Preferably, the upper end surface of the inner region 510 is arranged to protrude from the outer region 520 along the axial direction of the inner region 510 so that the thickness of the inner region 510 is greater than that of the outer region 520. By setting the second diaphragm 500 to a structure in which the thickness of the inner region 510 is greater than that of the outer region 520, the inner region 510 of the second diaphragm 500 has a larger absolute deformation. In the process of the second diaphragm 500 pushing the first diaphragm 400 to deform to close the valve seat 130, if the central region 410 of the first diaphragm 400 has been abutted and sealed with the valve seat 130 and the deformation region 420 has not yet been sealed with the valve seat 130, the inner region 510 with a large absolute deformation can be further compressed and deformed under the extrusion of the pushing member 620, so that the deformation region 420 of the first diaphragm 400 is also sealed with the valve seat 130. When the diaphragm closes the valve seat 130, the sealing between the diaphragm assembly 300 and the valve seat 130 is improved.

[0057] The pushing assembly 600 in this embodiment also includes a connecting member 630, the upper end of the connecting member 630 is slidably connected to the pushing member 620, a through hole 511 is provided at the center of the second diaphragm 500, the lower end of the connecting member 630 passes through the through hole 511 at the center of the second diaphragm 500, and is fixed to the central area 410 of the first diaphragm 400, and a gap is set between the connecting member 630 and the second diaphragm 500. In the process of the pushing member 620 moving toward the first diaphragm 400, the second diaphragm 500 bulges toward the first diaphragm 400 to deform, and the first diaphragm 400 is squeezed and pushed by the second diaphragm 500, and bulges toward the valve seat 130 to deform until the first diaphragm 400 closes the valve seat 130. In the whole process of the valve seat 130 switching from the open state to the closed state, there is always a gap between the upper end of the connecting member 630 and the driving member 610. There is always a gap, that is, when the valve seat 130 is in a sealed state (that is, the diaphragm assembly 300 closes the valve seat 130), there is still a gap between the upper end of the connecting member 630 and the driving member 610, so that the connecting member 630 and the driving member 610 are set with a gap, that is, during the entire pushing process of the pushing member 620, because the connecting member 630 and the driving member 610 are set with a gap, the connecting member 630 will not apply a force to the first diaphragm 400 to move toward the valve seat 130 along the axial direction of the pushing assembly 600. The connecting member 630 only limits the first diaphragm 400 along the radial direction of the pushing assembly 600 to ensure the stability of the position of the first diaphragm 400 in the horizontal direction, thereby ensuring the precise alignment of the first diaphragm 400 and the second diaphragm 500, so that the second diaphragm 500 can stably drive the deformation of various parts of the first diaphragm 400.

[0058] like Figure 6As shown, the push member 620 has a slide groove 623 inside, and the slide groove 623 extends along the axial direction of the push member 620. The driving member 610 is connected to the top of the push member 620 to limit the top of the slide groove 623. The push member 620 also has an annular convex rib, which is located at the bottom of the slide groove 623 to limit the bottom end of the slide groove 623 to prevent the connecting member 630 from falling out. The connecting member 630 has a sliding portion 631 and a rod portion 632. The sliding portion 631 is installed at the top of the rod portion 632. The sliding portion 631 is slidably connected in the slide groove 623. The rod portion 632 extends downward from the sliding portion 631 along the axial direction of the push member 620, and the bottom of the rod portion 632 is connected to the central area 410 of the first diaphragm 400. The driving member 610 can abut against the top of the connecting member 630 to drive the first diaphragm 400 to deform through the connecting member 630. At the same time, the sliding portion 631 cooperates with the slide groove 623, so that the pushing member 620 can limit the rod portion 632 in the horizontal direction through the slide groove 623, ensuring that the position of the central area 410 of the first diaphragm 400 does not change, and ensuring the stable opening and closing of the valve seat 130 by the first diaphragm 400. Preferably, the sliding portion 631 and the rod portion 632 are separately arranged, and the two are threadedly connected to reduce the difficulty of production and processing.

[0059] A mounting groove 411 opening upward is provided in the central area 410 of the first diaphragm 400, and the connecting piece 630 also includes a positioning protrusion 633, which surrounds the bottom of the outer peripheral side of the rod portion 632. When the rod portion 632 is inserted into the mounting groove 411, the positioning protrusion 633 is embedded in the mounting groove 411, and the inner diameter of the groove of the mounting groove 411 is smaller than the outer diameter of the positioning protrusion 633, so as to limit the positioning protrusion 633, so that the positioning protrusion 633 is always located in the mounting groove 411, and then the connecting piece 630 is axially limited to prevent the connecting piece 630 from being axially disengaged from the first diaphragm 400, thereby ensuring the stable connection between the connecting piece 630 and the first diaphragm 400.

[0060] When the valve seat 130 is in the maximum open state, there is a first vertical section and a second vertical section in the extending direction perpendicular to the valve seat 130. The first vertical section cuts the slide groove 623, the connecting member 630 and the central area 410, and the second vertical section cuts the first abutting surface 621. Fig.10As shown, on the first vertical section, the axial distance between the top of the slide groove 623 and the valve seat 130 is specified to be a, and the axial distance between the highest point of the sliding portion 631 and the lowest point of the central area 410 of the first diaphragm 400 is specified to be b. On the second vertical section, the axial distance between the first abutting surface 621 at the bottom of the push member 620 and the valve seat 130 is specified to be c, the thickness of the second diaphragm 500 is specified to be d, and the thickness of the first diaphragm 400 is specified to be e, satisfying ab>cde. In the process of the valve seat 130 switching from the maximum open state to the sealed closed state, the deformation height of the deformation area 420 of the first diaphragm 400 in the vertical direction is smaller than the deformation height of the central area 410 of the first diaphragm 400 in the vertical direction, so that the deformation area 420 will be sealed with the valve seat 130 first, and then the central area 410 will be sealed with the valve seat 130, thereby avoiding the situation where the central area 410 is sealed with the valve seat 130 while the deformation area 420 has not yet been sealed with the valve seat 130, and the sealing effect is good.

[0061] like Figure 7 As shown, the deformation area 420 has an umbrella-shaped segment 421, and the height of the umbrella-shaped segment 421 gradually decreases along the radial extension direction of the deformation area 420 from the inner side close to the central axis of the deformation area 420 to the outer side away from the central axis of the deformation area 420, so that the umbrella-shaped segment 421 presents a state of high inside and low outside. When the valve seat 130 switches from the maximum opening state to the sealing state, the umbrella-shaped segment 421 is deformed to change from bulging upward to bulging downward. During this process, the umbrella-shaped segment 421 slides toward its radial outer side, that is, the umbrella-shaped segment 421 can move radially relative to the second diaphragm 500, so that the first diaphragm 400 and the second diaphragm 500 fit more closely and the sealing effect is better.

[0062] A support protrusion 422 is provided at the top of the deformation area 420. When the valve seat 130 is in the maximum open state, the support protrusion 422 on the top of the deformation area 420 arches toward the second diaphragm 500, so that a gap is formed between the first diaphragm 400 and the second diaphragm 500. The gap is located radially inside the support protrusion 422; or, the gap is located radially outside the support protrusion 422; or, the gap is located both radially inside and radially outside the support protrusion 422. The gap formed by the support protrusion 422 between the first diaphragm 400 and the second diaphragm 500 allows the first diaphragm 400 to be slightly deformed toward the gap, thereby allowing the first diaphragm 400 to stabilize the pressure of the liquid when the liquid flows through the diaphragm assembly 300, and the flow of the liquid is smoother. When the diaphragm valve switches between an open or closed state, the setting of the gap can reduce the relative friction between the first diaphragm 400 and the second diaphragm 500, prevent excessive wear between the first diaphragm 400 and the second diaphragm 500, and extend the service life of the first diaphragm 400 and the second diaphragm 500.

[0063] When the valve seat 130 is in the maximum open state, the axial distance between the first abutting surface 621 of the push member 620 and the top surface of the second diaphragm 500 gradually increases from the inside to the outside (i.e., close to the central axis of the push member 620 and away from the central axis of the push member 620), that is, the first abutting surface 621 is an arc-shaped surface bulging downward, so that when the push member 620 pushes the second diaphragm 500 to deform, the center position of the push member 620 first contacts the second diaphragm 500, and the edge position of the push member 620 contacts the second diaphragm 500 later. The second diaphragm 500 can be pressed from the inside to the outside to the deformation area 420 of the first diaphragm 400, so that the deformation area 420 slides radially outward, so that the first diaphragm 400 and the second diaphragm 500 fit more closely and the sealing effect is better. Of course, it is understandable that the present embodiment can also individually or simultaneously set the axial distance between the top surface of the umbrella-shaped surface and the bottom surface of the second diaphragm 500 to gradually increase from the inside to the outside, so that the second diaphragm 500 can be pressed from the inside to the outside to the deformation area 420 of the first diaphragm 400, thereby causing the deformation area 420 to slide radially outward, and the first diaphragm 400 and the second diaphragm 500 fit more closely.

[0064] In this embodiment, if Figure 6 As shown, the bottom of the first diaphragm 400 is provided with a first sealing rib 440 protruding from the bottom surface of the first diaphragm 400. The first sealing rib 440 is annular and is arranged around the central axis of the pushing assembly 600. The first sealing rib 440 is against the valve body 100 to fill the gap between the first diaphragm 400 and the valve body 100, thereby enhancing the sealing between the first diaphragm 400 and the valve body 100. The first sealing rib 440 has an inner side surface 441 and an outer side surface 442. The inner side surface 441 and the outer side surface 442 are both inclined. The angle between the inner side surface 441 and the horizontal plane is smaller than the angle between the outer side surface 442 and the horizontal plane, thereby enhancing the strength of the first sealing rib 440 to prevent the first sealing rib 440 from being deformed toward the outer shape due to the impact of the high-pressure liquid at the valve port and being unable to seal with the valve body 100, thereby improving the sealing effect between the first sealing rib 440 and the valve body 100.

[0065] like Fig. 9As shown, the valve body 100 is provided with a first anti-skid rib 140 surrounding the valve port, the first anti-skid rib 140 protrudes toward the first diaphragm 400, and the first diaphragm 400 is provided with a first anti-skid groove 450 opening downward. When the upper shell 200 and the valve body 100 clamp the diaphragm assembly 300 together, the first anti-skid rib 140 is inserted into the first anti-skid groove 450. The cooperation between the first anti-skid rib 140 and the first anti-skid groove 450 increases the contact area between the diaphragm assembly 300 and the first anti-skid rib 140, and enhances the sealing effect between the first diaphragm 400 and the valve body 100. The height of the first anti-skid rib 140 The depth of the first anti-skid groove 450 is greater than the depth of the first anti-skid groove 450, so that the first anti-skid groove 450 can only be mounted on the upper half of the first anti-skid rib 140, and the insertion is tighter, avoiding the depth of the first anti-skid groove 450 being greater than the height of the first anti-skid rib 140, which causes a gap between the first anti-skid groove 450 and the first anti-skid rib 140, so that the sealing effect between the first anti-skid groove 450 and the first anti-skid rib 140 is good. At the same time, the first sealing rib 440 can fit in the lower half of the first anti-skid rib 140 where the first anti-skid groove 450 is not mounted, which greatly enhances the sealing effect between the first diaphragm 400 and the valve body 100. A second anti-slip rib 460 is provided on the first diaphragm 400, and the second anti-slip rib 460 protrudes toward the second diaphragm 500. A second anti-slip groove 530 opening downward is provided on the second diaphragm 500. When the upper shell 200 and the valve body 100 clamp the diaphragm assembly 300 together, the second anti-slip rib 460 is inserted into the second anti-slip groove 530 to limit the installation of the first diaphragm 400 and the second diaphragm 500 in the horizontal direction, so as to facilitate the rapid assembly of the first diaphragm 400 and the second diaphragm 500 and increase the friction between the first diaphragm 400 and the second diaphragm 500 to avoid the edge of the first diaphragm 400 from falling out from between the valve body 100 and the second diaphragm 500 when the first diaphragm 400 is deformed, thereby ensuring the seal between the first diaphragm 400 and the valve body 100. The height of the second anti-skid rib 460 is greater than the depth of the second anti-skid groove 530, so that the second anti-skid groove 530 can only be set on the upper half of the second anti-skid rib 460, and the plug-in is tighter, so that the sealing effect between the second anti-skid groove 530 and the second anti-skid rib 460 is good. Of course, it can be understood that only the first anti-skid rib 140 or the second anti-skid rib 460 can be set on the valve body 100 in this embodiment.

[0066] In order to make the second diaphragm 500 less likely to deform than the first diaphragm 400, so that the second diaphragm 500 can form a support for the first diaphragm 400, thereby making the first diaphragm 400 have a better closing effect on the valve port, improving the sealing, and preventing the first diaphragm 400 from opening the valve port under the impact of high-pressure liquid, this embodiment uses different materials to make the first diaphragm 400 and the second diaphragm 500, so that the hardness of the second diaphragm 500 is greater than the hardness of the first diaphragm 400, or the strength of the second diaphragm 500 is greater than the strength of the first diaphragm 400. Of course, it can also be satisfied that the hardness of the second diaphragm 500 is greater than the hardness of the first diaphragm 400 and the strength of the second diaphragm 500 is greater than the strength of the first diaphragm 400. Preferably, the first diaphragm 400 is a PTFE membrane (i.e., a polytetrafluoroethylene membrane), and the second diaphragm 500 is an EPDM membrane (ethylene propylene diene monomer rubber membrane). The first diaphragm 400 and the second diaphragm 500 are strengthened so that the first diaphragm 400, which is in direct contact with the liquid transported by the diaphragm valve, has stronger chemical stability than the second diaphragm 500 and is not easily corroded. At the same time, the second diaphragm 500 has stronger compression resistance than the first diaphragm 400, and has a better support effect on the first diaphragm 400. Of course, it is understandable that the first diaphragm 400 and the second diaphragm 500 can also be prepared by the same material or different materials in this embodiment. It is only necessary to set the thickness of the second diaphragm 500 to be greater than the thickness of the first diaphragm 400. The increased thickness can also enable the second diaphragm 500 to support the first diaphragm 400, so as to achieve the effect of improving the sealing of the first diaphragm 400.

[0067] The valve seat 130 in this embodiment has a valve port and a straight-line water retaining platform 131. The water retaining platform 131 is located between the inflow channel 110 and the outflow channel 120 to separate the inflow channel 110 and the outflow channel 120 in the horizontal direction. The valve port is located above the water retaining platform 131 and is respectively connected to the inflow channel 110 and the outflow channel 120 to connect the inflow channel 110 and the outflow channel 120. The strip area in the middle of the first diaphragm 400 is abutted against or separated from the water retaining platform 131 to achieve the opening and closing of the valve seat 130.

[0068] Embodiment 2:

[0069] The difference between this embodiment and the first embodiment is that, in this embodiment, during the process of the pusher moving toward the first diaphragm, the first abutting surface presses the second diaphragm so that the outer area of ​​the second diaphragm pushes the deformation area of ​​the first diaphragm close to the valve seat, and the connecting member pushes the central area downward to drive the central area close to the valve seat. That is, the pusher assembly directly drives the central area of ​​the first diaphragm to deform, so that the central area of ​​the first diaphragm can be relatively rigidly sealed on the valve seat, and the sealing effect can be more stable; at the same time, since the deformation area is integrally arranged on the radial outer side of the central area, such an arrangement can improve the stability of the deformation area, so that the deformation area can still maintain a sealed abutment with the valve seat after being impacted by liquid.

[0070] When the valve seat is in the maximum open state, a gap is set between the connecting member and the driving member in this embodiment; when the driving member drives the pushing member to move downward, the first abutting surface pushes the second diaphragm downward to deform, and the second diaphragm pushes the deformation area of ​​the first diaphragm downward to deform. During this process, the gap between the top of the connecting member and the driving member gradually decreases until the driving member and the connecting member abut against each other. At this time, the driving member that continues to move downward pushes the connecting member downward, and the central area of ​​the first diaphragm fixed at the bottom of the connecting member deforms downward to move closer to the valve seat; when the valve seat is closed, the connecting member and the driving member in this embodiment are abutted. At this time, the driving member can limit the central area of ​​the first diaphragm through the connecting member, so that under the impact of high-pressure liquid, the central area of ​​the first diaphragm can still maintain a close fit with the valve seat, and the sealing effect is good.

[0071] Preferably, in this embodiment, when the valve seat is in a sealed closed state, a gap is formed between the central area and the second diaphragm. The setting of the gap prevents the second diaphragm from contacting the central area, and all the driving force applied to the second diaphragm is transmitted to the deformation area of ​​the first diaphragm, thereby improving the sealing effect between the first diaphragm and the valve seat.

[0072] Embodiment three:

[0073] The difference between this embodiment and the first embodiment is that Fig.11 As shown, in this embodiment, the valve seat has an annular weir 132 with an opening facing upward, one side of the annular weir 132 is connected to the outflow channel 120, the peripheral side of the diaphragm assembly 300 is pressed against the valve body 100 to enclose a cavity 150 located below the diaphragm assembly 300 together with the valve body 100, the cavity 150 is located above the opening of the annular weir 132 and is connected to the inflow channel 110, when the first diaphragm 400 seals and closes the valve seat, the deformation area 420 of the first diaphragm 400 abuts against the top of the annular weir 132 to form a blockage for the opening of the annular weir 132, thereby blocking the connection of water flow between the cavity 150 and the opening of the annular weir 132, thereby achieving the closure of the valve seat.

[0074] Of course, in addition to the weir formed by the straight-line water retaining platform in the first embodiment of the present invention and the annular weir in this embodiment, the stacked first diaphragm and second diaphragm scheme of the present application can also be used for other valves requiring high pressure and large flow.

[0075] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

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, wherein the valve seat is used to connect the inflow channel and the outflow channel; An upper housing connected to the upper end of the valve body; A diaphragm assembly, used for opening and closing the valve seat; The push assembly is located on the side of the diaphragm assembly away from the valve seat, and is slidably connected in the upper shell and connected to the diaphragm assembly to drive the diaphragm assembly to block or open the valve seat through reciprocating motion; characterized in that: The diaphragm assembly includes a first diaphragm and a second diaphragm which are stacked, the second diaphragm is arranged on the side of the first diaphragm away from the valve seat, and the outer edges of the first diaphragm and the second diaphragm are clamped between the valve body and the upper shell.

2. A diaphragm valve according to claim 1, characterized in that: The first diaphragm comprises a central region, a mounting region for clamping between the upper housing and the valve body, and a deformation region between the central region and the mounting region; The pushing assembly includes a pushing member and a driving member. The pushing member pushes the second diaphragm to make the first diaphragm close to the valve seat.

3. A diaphragm valve according to claim 2, characterized in that: The pushing member has a first abutting surface and a second abutting surface located radially inside the first abutting surface; Wherein, the first abutting surface is arranged corresponding to the deformation area, and the second abutting surface is arranged corresponding to the central area.

4. A diaphragm valve according to claim 3, characterized in that: The second diaphragm has an inner area, and the second abutting surface presses the inner area to make the central area close to the valve seat; The lower end surface of the inner region is configured to conform to the upper end surface of the region corresponding to the axial direction of the first diaphragm, and the outer boundary of the horizontal projection of the inner region is located on the deformation region.

5. A diaphragm valve according to claim 4, characterized in that: The second diaphragm further comprises an outer region located outside the inner region, and an upper end surface of the inner region is axially protruded from the outer region so that the thickness of the inner region is greater than that of the outer region.

6. A diaphragm valve according to claim 3, characterized in that: The pushing assembly further comprises a connecting member slidably connected to the pushing member. When the valve seat is in a sealing state, the connecting member is spaced apart from the driving member and is directly fixed to the central area.

7. A diaphragm valve according to claim 2, characterized in that: The pushing assembly further includes a connecting member, and the pushing member has a first abutting surface; wherein, The first abutting surface presses the second diaphragm to make the deformation area close to the valve seat; The connecting member is directly fixed to the central area to drive the central area close to the valve seat.

8. A diaphragm valve according to claim 7, characterized in that: The connecting member is arranged with a gap between the connecting member and the driving member when the valve seat is in a maximum open state, and is arranged in contact with the driving member when the valve seat is closed.

9. A diaphragm valve according to claim 8, characterized in that: When the valve seat is in a sealing state, a gap is provided between the central area and the second diaphragm.

10. A diaphragm valve according to claim 6 or 7, characterized in that: The push member has an axially extending slide groove inside, and the driving member defines the top end of the slide groove; the connecting member has a sliding portion and a rod portion extending downward from the sliding portion to connect with the central area of ​​the first diaphragm; wherein the sliding portion is slidably connected to the slide groove.

11. A diaphragm valve according to claim 10, characterized in that: A mounting groove is provided in the central area of ​​the first diaphragm; the connecting member further comprises a positioning protrusion arranged around the rod portion, and the positioning protrusion is embedded in the mounting groove; Wherein, the inner diameter of the mounting groove is smaller than the outer diameter of the positioning protrusion, so as to axially limit the connecting member.

12. A diaphragm valve according to claim 10, characterized in that: When the valve seat is in the maximum open state, it has a first vertical section and a second vertical section perpendicular to the extension direction of the valve seat, wherein: The first vertical section cuts through the slide groove, the sliding portion and the central area, and the axial distance between the top of the slide groove and the valve seat on the first vertical section is a, and the axial distance between the highest point of the sliding portion and the lowest point of the central area is b; The second vertical section cuts a first abutting surface, and the axial distance between the first abutting surface and the valve seat on the second vertical section is c, and the thicknesses of the second diaphragm and the first diaphragm are d and e respectively; then: ab>cde.

13. The diaphragm valve according to claim 10, characterized in that: The second diaphragm is provided with a through hole for the rod to pass through, and a gap is set between the rod and the through hole.

14. A diaphragm valve according to claim 2, characterized in that: The deformation area has an umbrella-shaped section which is higher inside and lower outside in the radial extension direction, and the umbrella-shaped section slides radially outward when the valve seat is switched from being in a maximum open state to being in a sealing state.

15. A diaphragm valve according to claim 2 or 14, characterized in that: When the valve seat is in the maximum open state, the deformation area has a supporting protrusion that is arched toward the second diaphragm, and the first diaphragm and the second diaphragm form a gap radially inside and / or outside the supporting protrusion.

16. A diaphragm valve according to claim 14, characterized in that: When the valve seat is in the maximum open state, the axial distance between the pusher and the second diaphragm gradually increases from inside to outside; and / or the axial distance between the umbrella-shaped section and the second diaphragm gradually increases from inside to outside.

17. The diaphragm valve according to claim 1, characterized in that: The first diaphragm has a first sealing rib arranged in an annular shape, and the first sealing rib has an inner side surface and an outer side surface; the angle between the inner side surface and the horizontal plane is smaller than the angle between the outer side surface and the horizontal plane.

18. A diaphragm valve according to claim 1 or 17, characterized in that: The valve body has a first anti-skid rib protruding toward the first diaphragm, and the first diaphragm has a first anti-skid groove matched with the first anti-skid rib; the height of the first anti-skid rib is greater than the depth of the first anti-skid groove; And / or; the first diaphragm has a second anti-slip rib protruding toward the second diaphragm, and the second diaphragm has a second anti-slip groove cooperating with the second anti-slip rib; the height of the second anti-slip rib is greater than the depth of the second anti-slip groove.

19. The diaphragm valve according to claim 1, characterized in that: The hardness of the second diaphragm is less than the hardness of the first diaphragm; and / or the strength of the second diaphragm is greater than the strength of the first diaphragm; And / or, the thickness of the second diaphragm is greater than the thickness of the first diaphragm; and / or, the first diaphragm is a PTFE membrane, and the second diaphragm is an EPDM membrane.

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