Diaphragm valve

Abstract

The invention 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 can open or close 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. According to the diaphragm valve, 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 first supporting piece and the second supporting piece can conduct position switching 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] The invention belongs to the field of valves, and in particular relates to a diaphragm valve. Background Art

[0002] The diaphragm valve is a special valve that separates the fluid chamber inside the valve body from other parts through the diaphragm part to avoid contact between the fluid chamber and other parts of the structure, thereby effectively ensuring the cleanliness of the fluid in the valve body or preventing the fluid from corroding the structure of the rest of the valve body. Therefore, it is suitable for the delivery control of high-cleanliness liquids or corrosive liquids. In the diaphragm valve, the pressure of the fluid will act on the diaphragm. In order to prevent the diaphragm part from being deformed due to the pressure of the fluid and damaged by stress concentration, a support structure is provided on the back of the diaphragm to support the diaphragm.

[0003] For example, the patent with announcement number CN217898795U discloses a diaphragm valve for conveying corrosive fluids, which includes a valve body, which has an inlet flow channel, an outlet flow channel and a valve port for the corrosive fluid to flow through, and the valve port connects the inlet flow channel and the outlet flow channel; a valve assembly, including a valve core, a membrane portion arranged along the circumference of the valve core, and a fixing portion arranged on the outer ring of the membrane portion, the fixing portion sealingly connects the valve assembly to the valve body, the valve core axially reciprocates to block or open the valve port, and the membrane portion deforms as the state of the valve core switches; a diaphragm pressure plate, which is connected to the axial upper side of the valve body; the bottom of the diaphragm pressure plate has a contoured surface, and when the valve core opens the valve port, the contoured surface can be against the membrane portion to form support for it.

[0004] If the diaphragm is directly set in the outlet flow channel, there will still be a certain fluid pressure at the rear end of the valve body when the valve body is closed. Therefore, when the valve body is closed, the fluid will still exert a certain pressure on the diaphragm, causing the diaphragm to be easily deformed and damaged by the pressure of the fluid; or the diaphragm is directly set in the inlet flow channel. At this time, whether the valve is open or closed, the diaphragm will also be subject to the pressure of the fluid. In the valve body described in the above patent, the contoured surface at the bottom of the diaphragm pressure plate can only support the diaphragm when the valve body is open, and when the valve body is closed, the diaphragm is still easily damaged by the pressure of the fluid. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a diaphragm valve to solve the problem that the diaphragm cannot be supported when the diaphragm valve is closed, resulting in damage to the diaphragm.

[0006] 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; a valve assembly, comprising a valve core, a deformation part surrounding the outside of the valve core, and an outer edge part located outside the deformation part, and the outer edge part is sealed and fixed on the valve body; a drive assembly, comprising a valve stem connected to the valve core, through which the axial movement of the valve core can be controlled to realize the valve core opening or closing the valve seat; the diaphragm valve also includes a first support member and a second support member, and the first support member and the second support member are 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 movably arranged 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 when the valve seat is open, the first support member can support the deformation part, and when the valve seat is closed, the second support member can support the deformation part. This technical solution has the following technical effects:

[0007] The present invention arranges a first support member and a second support member on a side of the valve assembly away from the valve seat, and arranges the second support member to be able to change its axial position relative to the first support member under the drive of the drive assembly, so that when the valve stem of the drive assembly drives the valve core to move toward the valve seat to close the valve seat, it also drives the second support member to move toward the valve seat relative to the first support member. When the valve core closes the valve seat, in the parts of the first support member and the second support member opposite to the deformation part, the bottom end of the second support member is closer to the deformation part than the bottom end of the first support member. When the deformation part is deformed due to the fluid pressure in the valve body, the second support member can support the deformation part to avoid the deformation part being damaged due to excessive pressure. In the process of driving the valve core to move away from the valve seat to open the valve seat, the valve stem of the drive assembly simultaneously drives the second support member to move away from the valve seat relative to the first support member. When the valve core opens the valve seat, in the parts of the first support member and the second support member opposite to the deformation part, the bottom end of the first support member is closer to the deformation part than the bottom end of the second support member. At this time, when the deformation part is deformed by the fluid pressure in the valve body, the first support member can support the deformation part to avoid the deformation part being damaged due to excessive pressure. That is, the first support member and the second support member can switch their positions relative to the deformation part when the diaphragm valve is opened or closed, so that the deformation part of the diaphragm can be effectively supported regardless of whether the diaphragm valve is in an open or closed state, avoiding excessive deformation and damage of the deformation part caused by excessive fluid pressure in the valve body, thereby extending the service life of the diaphragm valve.

[0008] In the above-mentioned diaphragm valve, the first support member has a first support portion for supporting the deformation portion, and the second support member has a second support portion for supporting the deformation portion; wherein, when the valve seat is in an open state, the outer side of the bottom wall of the first support portion and the outer side of the bottom wall of the second support portion have a height difference; when the valve seat is in a closed state, the inner side of the bottom wall of the first support portion and the inner side of the bottom wall of the second support portion have a height difference. When the valve seat is in an open state, there is a height difference between the outer side of the bottom wall of the first support portion and the outer side of the bottom wall of the second support portion, so that the bottom wall of the first support portion can stably support the deformation portion; when the valve seat is in a closed state, there is a height difference between the inner side of the bottom wall of the first support portion and the inner side of the bottom wall of the second support portion, so that the bottom wall of the second support portion can stably support the deformation portion. The setting of the height difference enables the second support portion to independently support the deformation portion after the second support portion moves axially relative to the first support portion, and will not affect each other, which has a good supporting effect on the deformation portion.

[0009] In the above-mentioned diaphragm valve, there are multiple first support parts and second support parts, and avoidance gaps are set between adjacent first support parts, and multiple second support parts are axially movable in each avoidance gap. By setting the avoidance gap, it can be ensured that the first support part and the second support part can move axially relative to each other without interference; at the same time, multiple first support parts arranged at intervals can support the deformation part at multiple points. When the valve seat is opened, if the deformation part is subjected to pressure applied by the fluid, the pressure acting on the deformation part will be dispersed to each first support part, greatly reducing the force at various locations of the deformation part, avoiding concentrated force at a certain position of the deformation part, resulting in excessive deformation and damage of the deformation part, thereby extending the service life of the deformation part. By setting the second support part to a structure that cooperates with the avoidance gap, the second support part can form multi-point support for the deformation part when the valve seat is closed, and the pressure acting on the deformation part will be dispersed to each second support part, avoiding concentrated force at a certain position of the deformation part, resulting in excessive deformation and damage.

[0010] In the above-mentioned diaphragm valve, the bottom surface of the first support part is a symmetrical structure, and in the horizontal plane projection, the projections of the avoidance gaps on both sides of the bottom surface of the first support part are symmetrical about the symmetry axis 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, and the bottom surface of the second support part is 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 part are symmetrical about the symmetry axis of the projection of the bottom surface of the second support part. Because the projections of the avoidance 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, when the valve seat is in an open state, if the fluid in the valve body applies pressure to the deformation portion so that the deformation portion is against the first support portion, the positions corresponding to the two avoidance gaps on both sides of the bottom surface of the deformation portion and the first support portion are subjected to equal pressure, thereby avoiding the deformation portion from being twisted circumferentially due to different forces at the positions corresponding to the avoidance gaps on both sides of the bottom surface of the first support portion, thereby avoiding damage to the deformation portion caused by twisting; similarly, because 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, when the valve seat is in a closed state, if the fluid in the valve body applies pressure to the deformation portion so that the deformation portion is against the second support portion, the positions corresponding to the two separation gaps on both sides of the bottom surface of the deformation portion and the second support portion are subjected to equal pressure, thereby avoiding the deformation portion from being twisted circumferentially due to different forces at the positions corresponding to the separation gaps on both sides of the deformation portion and the second support portion.

[0011] In the above-mentioned diaphragm valve, a plurality of first support portions and a plurality of avoidance gaps are evenly spaced and arranged around the valve stem. The evenly spaced first support portions and avoidance gaps can make the force on the deformation portion more uniform, thereby preventing the deformation portion from being excessively deformed and damaged due to uneven force, resulting in excessive force on the local part.

[0012] In the above-mentioned diaphragm valve, the driving assembly controls the axial movement of the second support member to achieve the bottom of the second support portion extending to the lower side of the avoidance gap, or the bottom of the second support portion retracting into the avoidance gap or the upper side of the avoidance gap. Thus, in the closed valve state, the second support portion extends from the lower side of the avoidance gap to support the deformation portion, and in the open valve state, the second support portion extends into the avoidance gap or the upper side of the avoidance gap to achieve the first support portion supporting the deformation portion.

[0013] In the above-mentioned diaphragm valve, 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 on the valve stem, and a plurality of second support portions extend radially outward from the outer wall of the inner cylinder. The outer cylinder provides a circumferential installation position for the first support portion, and the inner cylinder provides a circumferential installation position for the second support portion. During assembly, it is only necessary to install the outer cylinder on the valve body and the inner cylinder on the valve stem. When the valve stem is inserted into the valve body, the installation and cooperation of the first support member and the second support member can be realized, simplifying the structure of the first support member and the second support member, facilitating installation, and making the cooperation of the first support member and the second support member stable and reliable.

[0014] In the above-mentioned diaphragm valve, the valve body includes a valve body provided with a valve seat and an upper shell installed on the valve body, and the first support member also has a protrusion protruding radially outward, and the protrusion and the outer edge are fixedly clamped between the valve body and the upper shell; wherein, during the movement of the valve stem, there is always a part of the second support member located in the avoidance gap. When the upper shell is locked on the valve body, the upper shell and the valve body clamp the protrusion and the outer edge together, so that the protrusion and the outer edge are fixedly clamped between the upper shell and the valve body, so as to realize the installation and positioning of the first support member, and facilitate the disassembly and assembly of the first support member. When the first support member is damaged and needs to be repaired, it is convenient to disassemble and replace the first support member, thereby reducing the maintenance cost, and at the same time, it has the effect of limiting the first support member to prevent the first support member from rotating. During the entire process of the second support member sliding with the valve stem, a part of the second support portion is always located in the avoidance gap. The avoidance gap can be used to limit the second support member circumferentially and guide it axially, so that the second support member cannot rotate during the up and down movement, thereby avoiding the circumferential rotation of the diaphragm and the second support member during the valve opening and closing process, and further avoiding the twisting of the diaphragm due to the circumferential rotation.

[0015] In the above-mentioned diaphragm valve, the valve assembly also includes a separation membrane located on the upper side of the deformation part, and when the deformation part is supported, the separation membrane is pressed between the deformation part and the first support member or the second support member. The first support member and the second support member do not directly contact the deformation part to support the deformation part, but support the deformation part through the sheet-shaped separation membrane. When the deformation part is pressed against the separation membrane by the pressure of the fluid in the valve body, the separation membrane can disperse the supporting force applied by the first support member or the second support member on the deformation part, so that the supporting force is evenly dispersed on the separation membrane, thereby making the pressure on various parts of the deformation part more uniform, avoiding the support force from being concentrated at the position where the deformation part contacts the first support member or the second support member, thereby avoiding the deformation part from being locally over-pressed to form an indentation or the stress from being too concentrated at a part of the deformation part to cause the deformation part to be over-deformed and easily damaged.

[0016] In the above-mentioned diaphragm valve, the partition membrane has a movable part opposite to the deformation part and an outer part located outside the movable part, wherein the outer part is clamped and fixed between the outer edge part and the first support part. By clamping and fixing the outer peripheral side of the partition membrane, it is convenient for disassembly and assembly, and the movement of the partition membrane can be limited. When the partition membrane is under pressure, its outer part is clamped and fixed, which can prevent the outer part from moving to the inside of the partition membrane, and then prevent the partition membrane from sinking into the avoidance gap, avoiding the partition membrane from being unable to fully disperse the supporting force due to the depression of the partition membrane into the avoidance gap, ensuring that the partition membrane can stably and fully disperse the supporting force, so that the pressure at various locations of the deformation part is more uniform.

[0017] In the above-mentioned diaphragm valve, the partition membrane has a first state in which the inner side bulges upward in the natural state, and in the first state, a gap is set between the movable part and the bottom wall of the first support part. The natural state refers to the situation that the pressure inside the valve body is the same as the external atmospheric pressure, and the first state refers to the partition membrane being able to maintain an upward bulge state in the absence of external force. When the partition membrane is not completely in contact with the first support, the partition membrane itself is in a tensioned state, and the partition membrane in this state can provide a certain support force for the deformation part. When the partition membrane is subjected to fluid pressure to further fit with the first support, the partition membrane will be further tightened. In the tightened state, if the partition membrane is to continue to be tightened, a larger force is required to overcome the tension force. Therefore, when the fluid pressure acts on the deformation part, the partition membrane is not easy to deform, that is, it is not easy to deform into the avoidance gap, thereby enhancing the supporting effect of the partition membrane on the deformation part, so that the partition membrane can better support the deformation part.

[0018] In the above-mentioned diaphragm valve, the vertical plane passing through the center axis of the valve stem is set as the cross section. At the same radial length, the length of the section cut by the vertical plane on the deformation part is greater than the length of the section cut by the vertical plane on the movable part. By setting the length of the section cut by the vertical plane on the movable part to be smaller than the length of the section cut by the vertical plane on the deformation part, the deformable area of ​​the movable part is smaller than the deformable area of ​​the deformation part. When the movable part is sunken into the avoidance gap and is tensioned, the deformation part is not in a tensioned state due to the large amount of deformation. Therefore, at this time, the deformation part can be supported by the already tensioned movable part at the avoidance gap, so as to avoid the deformation part from being sunken too much into the avoidance gap, and to avoid the deformation part from being unsupported and easily damaged at the avoidance gap.

[0019] In the above-mentioned diaphragm valve, an active gap is provided between the valve core and the second support member, and the partition membrane has an inner side portion located inside the movable portion, the inner side portion is at least partially located in the active gap, and the height of the active gap is greater than the thickness of the inner side portion. The thickness of the inner side portion is less than the height of the active gap, so that the inner side portion can move along the axial direction of the valve stem in the active gap, and the active gap can improve the degree of deformation of the partition membrane. When the length of the section cut by the vertical surface of the movable portion is less than the length of the section cut by the vertical surface of the deformed portion, the partition membrane in a taut state can be moved in the active gap to achieve its fit with the first support portion or the second support portion, thereby ensuring that the partition membrane effectively disperses the supporting force and has a better supporting effect on the deformed portion. It is avoided that the inner and outer sides of the partition membrane are fixed, and when it deforms and abuts against the first support portion or the second support portion, the movable portion is easily deformed due to the deformation of the movable portion.

[0020] In the above-mentioned diaphragm valve, the deformation portion of the valve seat is arranged to be higher inside and lower outside when the valve seat is in an open state, and the bottom surface of the first supporting portion is a first inclined surface for abutting the deformation portion, and the first inclined surface is inclined toward the valve stem; the deformation portion of the valve seat is arranged to be lower inside and higher outside when the valve seat is in a closed state, and the bottom surface of the second supporting portion is a second inclined surface for abutting the deformation portion, and the second inclined surface is inclined toward the direction away from the valve stem. When the valve seat is in an open state, the deformation part is in a state of being high inside and low outside. At this time, the deformation part is supported by the first inclined surface which is high inside and low outside, so that the slopes of the two are close, and the first inclined surface can fully support the deformation part, and minimize the deformation amount generated when the deformation part is subjected to fluid pressure, and the supporting effect on the deformation part is good; when the valve seat is in a closed state, the deformation part is in a state of being high outside and low inside. At this time, the deformation part is supported by the second inclined surface which is high outside and low inside, so that the slopes of the two are close, and the second inclined surface can fully support the deformation part, and minimize the deformation amount generated when the deformation part is subjected to fluid pressure, and the supporting effect on the deformation part is good. Therefore, the first inclined surface and the second inclined surface are set as two surfaces with opposite inclination directions, so that when the first support part and the second support part support the deformation part, the shapes of their support surfaces can adapt to the different states of the deformation part as much as possible, enhance their supporting effect on the deformation part, reduce the deformation amount of the deformation part when it is impacted by the fluid, effectively avoid the deformation part from being damaged due to excessive deformation, and extend the service life of the deformation part. In this state, it is ensured that the deformation amount of the deformation part itself will not be too large during the process of opening and closing the valve, so as to avoid the deformation amount of the deformation part being too large and easy to be damaged.

[0021] In the above-mentioned diaphragm valve, the second inclined surface is radially extended outward, and 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 setting the second inclined surface to have an inclined support surface and a gentle transition surface with different slopes, and setting the gentle transition surface to be gentler than the inclined support surface, the second inclined surface can smoothly transition to the horizontal plane through the gentle transition surface, and then when the second inclined surface supports the deformation part, the deformation part can smoothly transition to the outer edge through the gentle transition surface, avoiding excessive deformation of the deformation part when it contacts the edge of the second inclined surface to form an acute angle, and then avoiding stress concentration of the deformation part at this location and easy damage.

[0022] In the above-mentioned diaphragm valve, the size of the avoidance gap is larger than the size of the second support part, so that the gap between the second support part and the first support part is matched. When the second support part slides in the avoidance gap, the width of the avoidance gap is larger than the width of the second support part, and a gap can be formed between the two sides of the second support part and the first support part to minimize the relative friction between the first support part and the second support part, avoid the wear between the first support part and the second support part to generate dust and fall on the deformation part, and then avoid the dust accumulated on the deformation part when the deformation part abuts against the first support part or the second support part, causing damage to the deformation part.

[0023] In the above-mentioned diaphragm valve, the circumferential width of the bottom surface of the first support portion and / or the bottom surface of the second support portion is increased outwardly along the radial direction of the valve stem, so that the closer the first support portion and the second support portion are to the outer peripheral side, the larger the support area for the deformation portion, because the outer side of the deformation portion is subjected to a greater fluid pressure. Therefore, increasing the support area of ​​the deformation portion by the outer peripheral side of the first support portion and the second support portion for the deformation portion can effectively prevent the outer side of the deformation portion from being damaged due to excessive force, thereby extending the service life of the deformation portion.

[0024] 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

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

[0026] Figure 1 is a three-dimensional diagram of the diaphragm valve in Example 1;

[0027] Figure 2 A cross-sectional view of the diaphragm valve in the first embodiment in an open state

[0028] Figure 3 is a cross-sectional view of the diaphragm valve in the first embodiment in a closed state;

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

[0030] Figure 5 It 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 the first embodiment;

[0031] Figure 6 It 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 the first embodiment;

[0032] Figure 7 is a three-dimensional diagram of the second supporting member in the first embodiment;

[0033] Figure 8 is a bottom view of the second supporting member in the first embodiment;

[0034] Fig. 9 is a three-dimensional diagram of the first supporting member in the first embodiment;

[0035] Fig.10 is a cross-sectional view of the first supporting member in the first embodiment;

[0036] Fig.11 is a bottom view of the first supporting member in the first embodiment;

[0037] Fig.12 is a cross-sectional schematic diagram of the valve assembly in Example 1;

[0038] Fig.13 It is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve in the second embodiment is closed;

[0039] Fig.14 It is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve in the second embodiment is opened;

[0040] Fig.15 It is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve is closed in the third embodiment;

[0041] Fig.16 It is a partial cross-sectional view of the first support member and the second support member when the diaphragm valve in the third embodiment is opened.

[0042] Reference numerals:

[0043] 100, valve body; 110, upper shell; 111, breathing hole; 120, valve body; 121, inflow channel; 122, outflow channel; 123, valve seat; 124, valve chamber;

[0044] 210, valve core; 220, deformation portion; 230, outer edge portion; 240, separation diaphragm; 241, outer portion; 242, movable portion; 243, inner portion; 250, movable gap;

[0045] 300, valve stem;

[0046] 400, first support member; 410, first support portion; 411, first inclined surface; 420, avoidance gap; 430, outer cylinder; 431, vent hole; 432, vent groove; 440, protrusion;

[0047] 500, second support member; 510, second support portion; 511, second inclined surface; 5111, inclined support surface; 5112, smooth transition surface; 520, inner cylinder; 530, separation gap. DETAILED DESCRIPTION

[0048] A diaphragm valve proposed in the present invention comprises: 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; a valve assembly, comprising a valve core, a deformation part surrounding the outside of the valve core and an outer edge part located on the outside of the deformation part, and the outer edge part is sealed and fixed on the valve body; a drive assembly, comprising a valve stem connected to the valve core, and the axial movement of the valve core can be controlled by the valve stem to realize the valve core opening or closing the valve seat; the diaphragm valve also comprises a first support member and a second support member, and the first support member and the second support member are 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 movably arranged 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; when the valve seat is open, the first support member can support the deformation part, and when the valve seat is closed, the second support member can support the deformation part. The present invention provides a first support member and a second support member on a side of the valve assembly away from the valve seat, and the second support member is configured to be able to change its position in the axial direction relative to the first support member under the drive of the drive assembly, so that the valve stem of the drive assembly drives the valve core to move toward the valve seat to close the valve seat, and at the same time drives the second support member to move toward the valve seat relative to the first support member. When the valve core closes the valve seat, the second support member and the portion of the first support member opposite to the deformation portion have a bottom end closer to the deformation portion, and the fluid in the valve body is caused to move under the action of pressure. When the deformation part is deformed, the second support member can support the deformation part to prevent the deformation part from being damaged due to excessive pressure. In the process of driving the valve core to move away from the valve seat to open the valve seat, the valve stem of the driving assembly drives the second support member to move away from the valve seat relative to the first support member. When the valve core opens the valve seat, the bottom end of the first support member is closer to the deformation part in the first support member and the second support member relative to the deformation part. When the fluid in the valve body impacts the deformation part, the first support member can support the deformation part to prevent the deformation part from being damaged due to excessive pressure. That is, the first support member and the second support member can switch their positions relative to the deformation part when the diaphragm valve is opened or closed, so that the deformation part of the diaphragm can be effectively supported regardless of whether the diaphragm valve is in an open or closed state, thereby preventing the deformation part from being damaged due to excessive deformation caused by excessive water pressure in the valve body, thereby extending the service life of the diaphragm valve.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Embodiment 1:

[0055] A diaphragm valve, such as Figures 1 to 12As shown, the valve body 100 includes 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 to pass through. The valve seat 123 is formed between the inflow channel 121 and the outflow channel 122 to connect the inflow channel 121 and the outflow channel 122. The drive assembly is installed in the valve body 100. The drive assembly includes a valve stem 300 slidably connected in the valve body 100. The valve stem 300 can move along its own The valve assembly is arranged in the valve body 100 and cooperates with the valve stem 300, including a valve core 210 and a diaphragm. The valve core 210 is installed at the end of the valve stem 300. The diaphragm is arranged around the valve core 210. The diaphragm includes a deformation part 220 and an outer edge part 230. The deformation part 220 is connected around the outside of the valve core 210. The outer edge part 230 is located outside the deformation part 220. The outer edge part 230 is sealed and fixed on the valve body 100 to form a valve cavity 124 (such as Figure 2 as well as Figure 3 The valve cavity 124 is a 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 abuts against or moves away from the valve seat 123 to open or close the valve seat 123, thereby achieving the connection or disconnection of the fluid between the inflow channel 121 and the outflow channel 122. Figure 3 As described above, when the valve seat 123 is opened, the 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 Figure 3 Different from the above, the inflow channel 121 and the outflow channel 122 are arranged in opposite directions, that is, relative to the above-mentioned reverse flow, that is, they pass through the inflow channel in turn, and flow into the inside of the valve seat 123 from the upper side of the valve seat 123, and finally flow into the outflow channel and flow through the diaphragm valve. At this time, the valve cavity is a 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. The first support member 400 and the second support member 500 are both 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 the second support member 500 can move axially relative to the first support member 400.

[0057] The present invention arranges a first support member 400 and a second support member 500 on a side of the valve assembly away from the valve seat 123, and arranges the second support member 500 to be able to change its position relative to the first support member 400 in the axial direction under the drive of the drive assembly, so that the valve stem 300 of the drive assembly drives the valve core 210 to move toward the valve seat 123 to close the valve seat 123, and at the same time drives the second support member 500 to move relative to the first support member 400 toward the valve seat 123, so that 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 to the deformation portion 220, the bottom of the second support member 500 is closer to the deformation portion 220, and finally as shown in FIG. Figure 3 As shown; when the pressure of the fluid in the valve body 100 acts on the deformation part 220, the second support member 500 can support the deformation part 220 to prevent the deformation part 220 from being damaged due to excessive pressure. In the process of driving the valve core 210 to move away from the valve seat 123 to open the valve seat 123, the valve stem 300 of the drive assembly also drives the second support member 500 to move away from the valve seat 123 relative to the first support member 400. When the valve core 210 opens the valve seat 123, in the area where the first support member 400 and the second support member 500 are opposite to the deformation part 220, the first support member 400 is closer to the deformation part 220, so that the first support member 400 supports the deformation part 220 in the open state, and finally as shown Figure 2 As shown; when the fluid pressure in the valve cavity 124 acts on the deformation part 220, the first support member 400 can support the deformation part 220 to prevent the deformation part 220 from being damaged due to excessive pressure. That is, the first support member 400 and the second support member 500 can switch their positions relative to the deformation part 220 when the diaphragm valve is opened or closed, so that the deformation part 220 of the diaphragm can be effectively supported regardless of whether the diaphragm valve is in an open or closed state, thereby preventing the deformation part 220 from being damaged due to excessive deformation caused by excessive fluid pressure in the valve cavity 124, thereby extending the service life of the diaphragm valve. Of course, the open state here refers to the state where the valve body is fully open, and the closed state refers to the state where the valve body is fully closed.

[0058] like Figure 5 , Figure 6 , Fig. 9 as well as Fig.10 As shown, in this embodiment, the first support member 400 has a first support portion 410, and the first support portion 410 supports the deformation portion 220 through its bottom wall. It is stipulated that the side of the bottom wall of the first support portion 410 close to the valve stem 300 is the inner side of the bottom wall of the first support portion 410, and the side away from the valve stem 300 is 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, and the second support portion 510 supports the deformation portion 220 through its bottom wall. It is stipulated that the side of the bottom wall of the second support portion 510 close to the valve stem 300 is the inner side of the bottom wall of the second support portion 510, and the side away from the valve stem 300 is the outer side of the bottom wall of the second support portion 510.

[0059] The bottom wall of the first support portion 410 and the bottom wall of the second support portion 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 deformation portion 220; Figure 6 As shown, when the valve seat 123 is in a closed state, there is a height difference between the inner side of the bottom wall of the first support portion 410 and the inner side of the bottom wall of the second support portion 510, so that the bottom wall of the second support portion 510 can stably support the deformation portion 220. The setting of the height difference can prevent the second support portion 510 from affecting the support of the first support portion 410 for the deformation portion in the open valve state; at the same time, in the closed valve state, the first support portion 410 is prevented from interfering with the second support portion 510. That is, after the second support portion 510 moves axially relative to the first support portion 410, the two independently support the deformation portion 220 without affecting each other, and the support effect on the deformation portion 220 is good, and the deformation portion 220 is prevented from being damaged due to excessive deformation caused by force.

[0060] The first support portion 410 is used to support the bottom wall of the deformation portion 220 as the first inclined surface 411, and the second support portion 510 is used to support the bottom wall of the deformation portion 220 as the 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 first inclined surface 411 is higher inside and lower outside, and the second inclined surface 511 is inclined toward the outer peripheral side of the second support portion 510 (i.e., away from the central axis of the valve stem 300), so that the second inclined surface 511 is lower inside and higher outside. Figure 2 as well as Figure 3 The upper middle side is the upper side, Figure 2 as well as Figure 3 The lower middle side serves as the lower side.

[0061] When the valve seat 123 is in the open state, Figure 2As shown, the deformation part 220 is in a state of being high inside and low outside. At this time, the deformation part 220 is supported by the first inclined surface 411 which is high inside and low outside, so that the slopes of the two are close. The first inclined surface 411 can fully support the deformation part 220, and minimize the deformation amount of the deformation part 220 when it is impacted by the fluid, and the supporting effect of the deformation part 220 is good. When the valve seat 123 is in a closed state, as shown in FIG. Figure 3 As shown, the deformation part 220 is in a state of being high outside and low inside. At this time, the deformation part 220 is supported by the second inclined surface 511 which is high outside and low inside, so that the slopes of the two are close. The second inclined surface 511 can fully support the deformation part 220, and reduce the deformation amount generated when the deformation part 220 is impacted by the fluid as much as possible, and the support effect of the deformation part 220 is good. Therefore, the first inclined surface 411 and the second inclined surface 511 are set as two surfaces with opposite inclination directions, so that when the first support part 410 and the second support part 510 support the deformation part 220, the shape of the support surface can adapt to the different states of the deformation part 220 as much as possible, enhance the support effect of the deformation part 220, reduce the deformation amount of the deformation part 220 when it is impacted by the fluid below, effectively avoid the deformation part 220 from being damaged due to excessive deformation, and extend the service life of the deformation part 220. And at this time, it is adapted to the situation that the inner bottom of the diaphragm is high outside when the valve body is closed, and the diaphragm is high inside and low outside when the valve body is opened. Such a configuration of the diaphragm ensures that the diaphragm itself will not be stretched too much during the process of opening and closing the valve, thereby ensuring that the service life of the diaphragm itself will be longer.

[0062] In this embodiment, the second inclined surface 511 is preferably arranged to extend radially toward the outer peripheral side of the second supporting portion 510. Figure 6 As shown, the second inclined surface 511 includes an inclined supporting surface 5111 and a gentle transition surface 5112. The gentle transition surface 5112 is arranged at one end of the inclined supporting surface 5111 away from the valve stem 300, and the slope of the gentle transition surface 5112 is smaller than the slope of the inclined supporting surface 5111, so that the gentle transition surface 5112 is closer to the horizontal plane than the inclined supporting surface 5111. By setting the second inclined surface 511 to have an inclined supporting surface 5111 and a gentle transition surface 5112 with different slopes, and setting the gentle transition surface 5112 to be gentler than the inclined supporting surface 5111, the second inclined surface 511 can achieve a smooth transition to the horizontal plane through the gentle transition surface 5112, and then when the second inclined surface 511 supports the deformation part 220, the deformation part 220 can smoothly transition to the outer edge part 230 through the gentle transition surface 5112, thereby avoiding excessive deformation of the deformation part 220 when contacting the edge of the second inclined surface 511 to form an acute angle, which may easily cause stress concentration at this location of the deformation part 220 and make it easy to be damaged.

[0063] In this embodiment, a plurality of first supporting portions 410 and a plurality of second supporting portions 510 are provided, and the plurality of first supporting portions 410 are arranged at intervals and distributed around the central axis of the valve stem 300. Figure 2 as well as Figure 6 As shown, an avoidance gap 420 is formed between two adjacent first support portions 410, and a plurality of second support portions 510 are distributed around the central axis of the valve stem 300, as shown in FIG. Figure 2 As shown in FIG. 7 , a separation gap 530 is formed between two adjacent second support portions 510, and the second support portions 510 are arranged and matched with the avoidance gap 420 in a one-to-one correspondence, so that the second support portions 510 are slidably connected with the avoidance gap 420, and the first support portion 410 is arranged and matched with the separation gap 530 in a one-to-one correspondence, so that the first support portion 410 is slidably connected with the separation gap 530. In 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 avoidance gap 420, so as to extend or not extend out of the avoidance gap 420. When the valve seat 123 is in an open state, the end of the second support portion 510 close to the deformation portion 220 does not extend out of the avoidance gap 420, so that the first support portion 410 supports the deformation portion 220; when the valve seat 123 is in a closed state, the end of the second support portion 510 close to the deformation portion 220 extends out of the avoidance gap 420, so that the second support portion 510 supports the deformation portion 220.

[0064] The difference between this structure and the prior art is that: in the prior art, the support structure on the back of the diaphragm is often provided with a contoured surface to achieve a larger contact area between the contoured surface and the diaphragm, thereby having a greater support effect on the diaphragm and preventing the diaphragm from being damaged by the pressure of the fluid. The support scheme of the present invention is different from the prior art. It does not pursue a larger area of ​​support, but adopts the support scheme as described above. Through multiple first support parts 410 or multiple second support parts 510, it can achieve multi-point support for the deformation part 220, so that the pressure of the fluid on the deformation part 220 will be dispersed by multiple first support parts 410 or multiple second support parts 510, so as to avoid a certain local stress concentration of the deformation part 220, for example, to avoid stress concentration at the root where the deformation part 220 is connected to the valve core 210 and the outer edge part 230, which makes the deformation part easy to be damaged. Even if the support area for the deformation part 220 is relatively small compared with the prior art, it can well ensure that the deformation part 220 will not be damaged by the pressure of the fluid.

[0065] More specifically, when the valve seat 123 is opened, if the deformation part 220 is subjected to pressure exerted by the fluid, the pressure exerted by the fluid on the deformation part 220 will be dispersed to each first support part 410, greatly reducing the force exerted on each part of the deformation part 220, avoiding excessive deformation and damage caused by concentrated force on a certain position of the deformation part 220, and extending the service life of the deformation part 220. By setting the second support part 510 to a structure that cooperates with the avoidance gap 420, the second support part 510 can form multi-point support for the deformation part 220 when the valve seat 123 is closed, and the pressure exerted on the deformation part 220 will be dispersed to each second support part 510, avoiding excessive deformation and damage caused by concentrated force on a certain position of the deformation part 220.

[0066] Fig.11 is a bottom view of the first support member 400, and the first support member 400 projects a pattern on a horizontal plane. Fig.11 same, Figure 8 is a bottom view of the second support member 500, and the second support member 500 projects a pattern on a horizontal plane. Figure 8 Same, so this embodiment is based on Fig.11 As a projection diagram of the first support member 400 on a horizontal plane, Figure 8 The following description is made by taking the projection of the second support member 500 on a horizontal plane as an example. Fig.11 As shown, the bottom surface of the first inclined surface 411 is a symmetrical structure, and the symmetry axis thereof projected on the horizontal plane is L1. In the horizontal plane projection, the projections of the avoidance gaps 420 on both sides of the bottom surface of the first support portion 410 are symmetrical about the symmetry axis L1, as shown in FIG. Figure 8As shown, the bottom surface of the second inclined surface 511 is also a symmetrical structure, and the symmetry axis of the projection on the horizontal plane is L2, and the projections of the separation gaps 530 on both sides of the bottom surface of the second support portion 510 are symmetrical about the symmetry axis L2. Because the projections of the avoidance gaps 420 on both sides of the bottom surface of the first support portion 410 are symmetrical about the symmetry axis L1, when the valve seat 123 is in an open state, if the fluid in the valve cavity 124 applies pressure to the deformation portion 220 so that the deformation portion 220 and the first support portion 410 are against each other, the positions corresponding to the two avoidance gaps 420 on both sides of the deformation portion 220 and the first support portion 410 are subjected to equal pressure, thereby avoiding the deformation portion 220 from twisting in the circumferential direction due to different forces on the positions corresponding to the avoidance gaps 420 on both sides of the first support portion 410, thereby avoiding the twisting causing Similarly, because the projections of the separation gaps 530 on both sides of the second support portion 510 are symmetrical about the symmetry axis L2, when the valve seat 123 is in a closed state, if the fluid in the valve cavity 124 applies pressure to the deformation portion 220 so that the deformation portion 220 and the second support portion 510 are against each other, the positions corresponding to the two separation gaps 530 on both sides of the deformation portion 220 and the second support portion 510 are subjected to equal pressure, thereby avoiding the deformation portion 220 from twisting in the circumferential direction due to different forces on the positions corresponding to the separation gaps 530 on both sides of the second support portion 510. Of course, it can be understood that the above description is only a preferred implementation of this embodiment, and it is also possible to make only the projections of the avoidance gaps on both sides of the first support portion symmetrical about the symmetry axis L1, or only the projections of the separation gaps on both sides of the second support portion 510 symmetrical about the symmetry axis L2.

[0067] In this embodiment, the first support member 400 and the second support member 500 can have various structures. The sliding connection between the first support member 400 and the second support member 500 can be achieved by simply providing a portion for the second support member 500 to pass through on the first support member 400 (i.e., a structure similar to an avoidance gap). Preferably, multiple first support portions 410 and multiple avoidance gaps 420 are evenly spaced around the valve stem 300. Through the evenly spaced first support portions 410 and avoidance gaps 420, the force on the deformation portion 220 can be made more even, thereby preventing the deformation portion 220 from being excessively deformed and damaged due to uneven force resulting from excessive local force. Moreover, the circumferential distribution of the first support portions 410 can also achieve a simpler structural processing design. At the same time, since the avoidance gaps 420 are also circumferentially distributed, when the pressure of the liquid in the avoidance gaps 420 applies pressure to the deformation portion 220, it can be avoided that the deformation portion 220 is compressed and causes the outer portion to deform inwardly or the inner portion to deform outwardly, resulting in stress concentration and damage at the root where the deformation portion 220 is connected to the outer edge portion 230 or the valve core 210. The circumferentially distributed structure can ensure that the pressure exerted by the fluid at each avoidance gap 420 on the deformation part 220 will be better dispersed near the first support part 410 or the second support part 510, avoiding stress concentration at the root of the deformation part to ensure the service life of the diaphragm.

[0068] In this embodiment, the first support member 400 includes an outer cylinder 430, the first support portion 410 is arranged on the inner wall of the outer cylinder 430, and extends from the inner wall of the outer cylinder 430 along its radial direction to the inside of the outer cylinder 430, the second support member 500 includes an inner cylinder 520, the inner cylinder 520 is fixed on the valve stem 300 to be linked with the valve stem 300, and the second support portion 510 is arranged on the outer wall of the inner cylinder 520, and extends from the outer wall of the inner cylinder 520 along its radial direction to the outside of the inner cylinder 520. The outer cylinder 430 provides a circumferential installation position for the first support portion 410, and the inner cylinder 520 provides a circumferential installation position for the second support portion 510. During assembly, it is only necessary to install the outer cylinder 430 on the valve body 100 and the inner cylinder 520 on the valve stem 300. When the valve stem 300 is inserted into the valve body 100, the installation and coordination of the first support member 400 and the second support member 500 can be achieved, thereby simplifying the structure of the first support member 400 and the second support member 500, facilitating installation, and making the coordination of the first support member 400 and the second support member 500 stable and reliable.

[0069] like Figure 1-3As shown, the valve body 100 includes a valve body 120 and an upper shell 110, a valve seat 123, an inflow channel 121 and an outflow channel 122 are all formed on the valve body 120, and the upper shell 110 is installed on the upper part of the valve body 120. A protrusion 440 protruding outward in its radial direction is provided on the outer wall of the outer cylinder 430, and the protrusion 440 is annular. When the first support member 400 is installed in the valve body 100, the outer wall of the outer cylinder 430 abuts against the inner wall of the upper shell 110, and the protrusion 440 passes from the lower direction of the upper shell 110, so that the protrusion 440 and the outer edge portion 230 are located together in the upper shell 1 10 and the valve body 120, and the protrusion 440 is located above the outer edge 230. When the upper shell 110 is locked on the valve body 120, the upper shell 110 and the valve body 120 jointly 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 shell 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 the maintenance cost.

[0070] Preferably, a ventilation groove 432 with an opening toward the inner wall of the upper shell 110 is provided on the outer wall of the outer cylinder 430, and the ventilation groove 432 is annular and is arranged around the central axis of the first support member 400. A first ventilation hole 431 is also provided on the outer cylinder 430, and the first ventilation hole 431 passes through the outer cylinder 430 to connect the ventilation groove 432 with the space above the deformation part 220. A breathing hole 111 is provided on the upper shell 110, and the breathing hole 111 passes through the upper shell 110 to connect the ventilation groove 432 with the outside. The space above the deformation part 220 is connected to the outside world through the vent hole 431, the vent groove 432 and the breathing hole 111, which can balance the air pressure in the space above the deformation part 220. When the deformation part 220 of the diaphragm and the deformation part 220 are deformed up and down, the space above the deformation 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 hole 431 and the breathing hole 111 during installation. The upper shell 110 can be rotated arbitrarily, and the breathing hole 111 is always aligned with the vent groove 432, thereby realizing the connection between the breathing hole 111 and the vent hole 431, ensuring the connection between the space above the deformation part 220 and the outside world, and reducing the assembly difficulty between the upper shell 110 and the valve body 120.

[0071] The drive assembly in this embodiment 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 close to the deformation portion 220) extends to the lower side of the avoidance gap 420 when the valve seat 123 is closed to support the deformation portion 220, or retract the bottom of the second support portion 510 into the avoidance gap 420 when the valve seat 123 is opened, so that the bottom of the first support portion 410 (i.e., the end of the first support portion 410 close to the deformation portion 220) supports the deformation portion 220. As in the above structure, the outer cylinder 430 is fixed on the valve body 100, and during the entire process that the second support member 500 slides with the valve stem 300, the second support member 500 in this embodiment is never separated from the avoidance gap 420, that is, a part of the second support portion 510 is always located in the avoidance gap 420, so that the second support member 500 is circumferentially limited and axially guided through the avoidance gap 420, thereby limiting the second support portion 510, so that during the process of opening and closing the valve, the second support portion 510 is used to limit the circumferential rotation of the valve shaft 300 and the valve assembly, thereby avoiding circumferential torsion of the diaphragm.

[0072] Of course, it is understandable that in other embodiments, the second support member 500 may also be located above the avoidance gap 420 when the valve seat 123 is open, that is, when the valve seat 123 is open, the second support member 500 is in a disengaged state from the avoidance gap 420, and in the process of switching the valve seat 123 from the open state to the closed state, the second support member 500 moves from the upper side of the avoidance gap 420 to the inside of the avoidance gap 420, and finally when the valve seat 123 is in the closed state, the bottom of the second support member 500 extends to the lower side of the avoidance gap 420 to support the deformation portion 220. And in other embodiments, the structures of the first support portion and the second support portion may also be the same as Figure 5-9 The structure in is different, for example, the first supporting part or the second supporting part can also be a rod-shaped structure.

[0073] Furthermore, the size of the avoidance gap 420 is made larger than the size of the second support portion 510, so that the gap between the second support portion 510 and the first support portion 410 is matched. When the second support portion 510 slides in the avoidance gap 420, the width of the avoidance gap 420 is larger than the width of the second support portion 510, and a gap can be formed 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 avoids the situation in which the deformation portion 220 is easily damaged locally due to the compression of debris and dust when the subsequent deformation portion 220 abuts against the second support portion 510 or the first support portion 410. When the following partition diaphragm 240 is provided, debris and dust enter between the partition diaphragm 240 and the deformable part 220, causing the partition diaphragm 240 and the deformable part 220 to be easily worn and damaged due to friction between the two when the valve is opened and closed, or the debris and dust are pressed between the two and damaged.

[0074] In this embodiment, the valve assembly further includes a separation diaphragm 240, which is located below the first support member 400 and the second support member 500 and above the deformation portion 220. When the deformation portion 220 is supported by the first support member 400, the separation diaphragm 240 is pressed between the deformation portion 220 and the first support member 400. When the deformation portion 220 is supported by the second support member 500, the separation diaphragm 240 is pressed between the deformation 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 deformation portion 220 to support the deformation portion 220, but The deformation part 220 is supported by a sheet-like separation diaphragm 240. When the deformation part 220 is subjected to the fluid pressure in the valve chamber 124 and abuts against the separation diaphragm 240, the separation diaphragm 240 can disperse the supporting force applied by the first support part 410 or the second support part 510 on the deformation part 220, thereby making the pressure on various parts of the deformation part 220 more uniform, avoiding the support force from being concentrated at the position where the deformation part 220 contacts the first support part 410 or the second support part 510, thereby avoiding the occurrence of indentations on the deformation part 220 or excessive concentration of stress at a local position of the deformation part 220, causing excessive deformation of the deformation part 220.

[0075] The separation diaphragm 240 in this embodiment has a movable portion 242 and an outer portion 241. The movable portion 242 is arranged opposite to the deformation portion 220 in upper and lower directions. The outer portion 241 is located on the outer peripheral side of the movable portion 242 so as to be arranged opposite to the outer edge portion 230 in upper and lower directions. When the protrusion 440 and the outer edge portion 230 are clamped between the upper shell 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 shell 110 and the valve body 120 jointly clamp the protrusion 440 of the first support member 400, the outer portion 241 of the separation diaphragm 240 and the outer edge portion 230 of the diaphragm. By clamping the outer peripheral side of the separator diaphragm 240 to facilitate disassembly and assembly, the movement of the separator diaphragm 240 can be limited. When the separator diaphragm 240 is under pressure, its outer side 241 is clamped and fixed, which can prevent the outer side 241 from moving toward the inner side of the separator diaphragm 240, thereby preventing the separator diaphragm 240 from sinking into the avoidance gap 420, thereby avoiding the situation where the separator diaphragm at the avoidance gap 420 cannot fully support the deformation part 220 due to the separator diaphragm 240 sinking into the avoidance gap 420.

[0076] When the valve seat 123 is in an open state and there is no fluid pressure inside (the pressure inside the valve body is the same as the external atmospheric pressure), the separation diaphragm 240 naturally has a first state in which the inner side bulges upward (that is, when there is no external force, the separation diaphragm 240 can stably maintain this state). In the first state, a gap is provided between the movable portion 242 of the separation diaphragm 240 and the bottom wall of the first support portion 410. In the first state, the separation diaphragm 240 is not completely in contact with the first support member 400, and the separation diaphragm 240 itself is in a tensioned state. In this state, the separation diaphragm 240 can provide a certain supporting force for the deformation portion 220. In actual use, the fluid pressure causes the deformation part 220 and the separation membrane 240 to further deform upward, so that when the separation membrane 240 further fits the first support member 400, the separation membrane 240 will be further tightened. In the tightened state, the separation membrane 240 has a large tension force and makes it difficult for itself to deform into the avoidance gap 420, so that the separation membrane 240 at the avoidance gap 420 can play a good supporting effect. That is, the supporting effect of the separation membrane 240 on the deformation part 220 can be enhanced, so that the separation membrane 240 can better support the deformation part 220 and disperse the supporting force.

[0077] In this embodiment, the vertical plane passing through the central axis of the valve stem 300 is taken as the cross section. Figure 4As shown, at the same radial length, the section length of the deformation portion 220 cut by the vertical plane is greater than the section length of the movable portion 242 cut by the vertical plane, and the section length here refers to the contour line length of the deformation portion 220 and the movable portion 242 cut by the cross section, that is, at the same radial length, the overall area of ​​the diaphragm deformation portion 220 is greater than the overall area of ​​the movable portion 242 of the separation diaphragm 240. When the deformation part 220 is subjected to fluid pressure, the movable part 242 opposite to the avoidance gap 420 and the deformation part 220 will both be recessed into the avoidance gap 420. By setting the length of the section cut by the vertical surface of the movable part 242 to be smaller than the length of the section cut by the vertical surface of the deformation part 220, the deformable area of ​​the movable part 242 is smaller than the deformable area of ​​the deformation part 220. When the movable part 242 is recessed into the avoidance gap 420 and is tensioned, the deformation part 220 is not yet in a tensioned state and is blocked by the tensioned movable part 242 and cannot continue to be recessed into the avoidance gap 420, thereby preventing the deformation part 220 from being recessed too much into the avoidance gap 420, resulting in excessive deformation and damage of the deformation part 220.

[0078] The separation membrane 240 further comprises an inner portion 243, which is located inside the movable portion 242. Figure 4 As shown, the inner part 243 and the movable part 242 are separated by a dotted line in the figure. An active gap 250 is provided between the valve core 210 and the second support member 500, and the inner part 243 is entirely or partially located in the active gap 250. The thickness of the inner part 243 is less than the height of the active gap 250, so that the inner part 243 can move along the axial direction of the valve stem 300 in the active gap 250. The active gap 250 can improve the degree of deformation of the separation diaphragm 240. When the length of the section of the movable part 242 cut by the vertical plane is less than the length of the section of the deformation part 220 cut by the vertical plane, the separation diaphragm 240 in a taut state can be moved in the active gap 250 to achieve the fit between the first support part 410 or the second support part 510, thereby ensuring that the separation diaphragm 240 effectively disperses the supporting force and has a better supporting effect on the deformation part 220. At the same time, it is avoided that the separation membrane 240 is fixed inside and outside, and when it deforms and contacts the first support part 410 or the second support part 510 , the deformation is entirely dependent on the movable part 242 , which causes the movable part 242 to be easily deformed.

[0079] Preferably, in the present embodiment, the circumferential width of the first support portion 410 and the circumferential width of the second support portion 510 both increase from the inside to the outside along the radial direction of the valve stem 300, that is, the circumferential width of the first inclined surface 411 and the circumferential width of the second inclined surface 511 both increase from the central axis to the periphery along the radial direction of the valve stem 300, so that the closer the first support portion 410 and the second support portion 510 are to the outer peripheral side, the larger the support area for the deformation portion 220, because the fluid pressure on the outer side of the deformation portion 220 is greater. Therefore, increasing the support area of ​​the outer peripheral side of the first support portion 410 and the second support portion 510 for the deformation portion 220 can effectively avoid damage to the outer side of the deformation portion 220 due to excessive force, thereby extending the service life of the diaphragm deformation portion 220. Of course, it is understandable that in this embodiment, only the circumferential width of the first support portion 410 can be set to increase from inside to outside along the radial direction of the valve stem 300, or only the circumferential width of the second support portion 510 can be set to increase from inside to outside along the radial direction of the valve stem 300.

[0080] Embodiment 2:

[0081] like Fig.13 and Fig.14 As shown, the difference between this embodiment and embodiment one 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 situation that the deformation 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 surface 411 is greater than the slope of the second inclined surface 511. When the valve seat is in a closed state, Fig.13 As shown, the bottom of the second support portion 510 extends out of the separation gap, the second support portion 510 supports the deformation portion 220, and a height difference H is formed 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 shown Fig.14 As shown, the bottom of the second support portion 510 no longer extends out of the separation gap, and the first support portion 410 supports the deformation portion 220 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] Embodiment three:

[0084] like Fig.15 and Fig.16 As shown, the difference between this embodiment and embodiment one 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 direction of the valve stem, that is, the outer side is higher and the inner side is lower. This situation is applicable to the situation that the deformation 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 surface 411 is smaller than the slope of the second inclined surface 511. When the valve seat is in the closed state, Fig.15 As shown, the bottom of the second support portion 510 extends out of the separation gap, so that the outer side of the bottom wall of the first support portion 410 (i.e., the first inclined surface 411) and the outer side of the bottom wall of the second support portion 510 (i.e., the second inclined surface 511) form a height difference H; when the valve seat is in a closed state, as shown in FIG. Fig.16 As shown, the bottom of the second supporting portion 510 no longer extends out of the separation gap, so that a height difference H is formed between the inner side of the second inclined surface 511 and the inner side of the first inclined surface 411 .

[0086] 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, include: 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; The valve assembly comprises a valve core, a deformation portion surrounding the outside of the valve core, and an outer edge portion located outside the deformation portion, wherein the outer edge portion is sealed and fixed on the valve body; A drive assembly, comprising a valve stem connected to the valve core, through which the axial movement of the valve core can be controlled to enable the valve core to open or close the valve seat; It is characterized in that The diaphragm valve further comprises a first support member and a second support member, wherein the first support member and the second support member are both located on a 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 movably arranged in the valve body; Wherein, the driving 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; when the valve seat is in an open state, the first support member can support the deformation part, and when the valve seat is in a closed state, the second support member can support the deformation part.

2. A diaphragm valve according to claim 1, Features: The first support member has a first support portion for supporting the deformation portion, and the second support member has a second support portion for supporting the deformation portion; Among them, when the valve seat is open, 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 have a height difference; when the valve seat is closed, 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 have a height difference.

3. A diaphragm valve according to claim 2, Features: There are a plurality of the first supporting parts and the second supporting parts, and avoidance gaps are arranged between adjacent first supporting parts. The plurality of second supporting parts are axially movable in each avoidance gap.

4. A diaphragm valve according to claim 3, Features: The bottom surface of the first support portion is a symmetrical structure, and in the horizontal plane projection, the projections of the avoidance gaps on both sides of the bottom surface of the first support portion are symmetrical about the symmetry axis 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 is 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 symmetry axis of the projection of the bottom surface of the second support portion.

5. A diaphragm valve according to claim 4, Features: The plurality of first support portions and the plurality of avoidance gaps are evenly spaced and distributed around the valve stem.

6. A diaphragm valve according to any one of claim 3, Features: The driving assembly controls the axial movement of the second support member to achieve the bottom of the second support portion extending to the lower side of the avoidance gap, or the bottom of the second support portion retracting into the avoidance gap or the upper side of the avoidance gap.

7. A diaphragm valve according to claim 2, Features: The first support member comprises an outer cylinder, and the first support portion is radially extended inwardly from the inner wall of the outer cylinder; The second support member includes an inner cylinder fixed on the valve stem, and a plurality of second support portions are radially extended outward from an outer wall of the inner cylinder.

8. A diaphragm valve according to claim 3 or 6, Features: The valve body comprises a valve main body provided with the valve seat and an upper shell mounted on the valve main body, the first support member further comprises a protrusion protruding radially outward, the protrusion and the outer edge are fixedly clamped between the valve main body and the upper shell; In the process of the valve stem moving, part of the second supporting portion is always located in the avoidance gap.

9. A diaphragm valve according to any one of claims 2 to 7, Features: The valve assembly further includes a separation membrane located on the upper side of the deformation portion. When the deformation portion is supported, the separation membrane is pressed between the deformation portion and the first support member or the second support member.

10. A diaphragm valve according to claim 9, Features: The separation membrane has a movable portion opposite to the deformation 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, Features: The separation membrane has a first state in which the inner side is convex upward in a natural state. In the first state, a gap is provided between the movable portion and the bottom wall of the first support portion.

12. A diaphragm valve according to claim 10, Features: Assuming that the vertical plane passing through the central axis of the valve stem is a cross section, at the same radial length, the length of the section cut by the vertical plane on the deformation portion is greater than the length of the section cut by the vertical plane on the movable portion.

13. A diaphragm valve according to claim 12, Features: An active gap is provided between the valve core and the second support member, the separation membrane has an inner portion located inside the active portion, the inner portion is at least partially located in the active gap, and the height of the active gap is greater than the thickness of the inner portion.

14. A diaphragm valve according to claim 2, Features: The deformation portion of the valve seat in the open state is arranged to be higher inside and lower outside, the bottom surface of the first support portion is a first inclined surface for abutting against the deformation portion, and the first inclined surface is arranged to be inclined toward the direction of the valve stem; The deformation portion of the valve seat in the closed state is arranged to be lower inside and higher outside, and the bottom surface of the second supporting portion is a second inclined surface for abutting against the deformation portion, and the second inclined surface is inclined in a direction away from the valve stem.

15. A diaphragm valve according to claim 14, Features: The second inclined surface is radially extended 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, Features: The size of the avoidance gap is larger than the size of the second support portion, so that the second support portion and the first support portion are gap-matched.

17. A diaphragm valve according to claim 2, Features: The circumferential width of the bottom surface of the first support portion and / or the bottom surface of the second support portion is increased outwardly along the radial direction of the valve stem.

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