Diaphragm valve

Abstract

The utility model discloses a diaphragm valve which comprises a valve body, a cover body, a diaphragm, a driving assembly and a pressing block. A non-return piece is integrally arranged on the valve main body and extends upwards on the outer side of the neck part; a limiting bulge is arranged on the skirt part; wherein the non-return piece and / or the limiting protrusion are / is provided with a guide face facilitating movement of the cover body in the locking direction, and when the cover body is combined with the valve body and locked, the diaphragm abuts against the valve body. The limiting protrusion is connected to the non-return piece in a clamped mode so as to limit the cover body to move in the unlocking direction. The non-return piece and the valve main body are integrally arranged, the situation that the non-return piece and the valve main body are not installed in place, and therefore free reverse rotation of the cover body cannot be blocked is avoided, the non-return piece is arranged to be of an upward extending structure, the non-return piece is made to deform more easily, and when the cover body is rotated to enable the cover body and the valve main body to be locked or unlocked, the non-return piece is not prone to deformation. The non-return piece can deform towards the space between the non-return piece and the valve body, and the problem that the whole valve body is replaced due to the fact that the non-return piece is broken is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to a diaphragm valve. Background Art

[0002] A diaphragm valve is a special form of stop valve. Its opening and closing structure is a diaphragm made of soft material. The cover body is threadedly connected to the valve body. The diaphragm is arranged inside the cover body and the valve body with threaded connection. The diaphragm deforms under the push of the pushing component to control the on-off of the diaphragm valve. When the cover body is screwed onto the valve body, the peripheral side of the diaphragm is pressed against the peripheral side of the valve port through the pressing structure. Therefore, a reverse prevention structure needs to be set to prevent the cover body from rotating freely in the reverse direction and affecting the seal between the peripheral side of the diaphragm and the valve body.

[0003] Currently, in the prior art, the reverse prevention structure of the diaphragm valve is separately arranged from the valve body and the cover body. The safety element is detachably connected to the valve body. It is very easy that the safety element is not installed in place, or although the safety element is installed in place, the safety element slips during the movement of the cover body in the unlocking direction, resulting in its inability to prevent the reverse rotation of the cover body and affecting the seal between the peripheral side of the diaphragm and the valve body. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a structure to solve the problem that the reverse prevention part on the diaphragm valve cannot prevent reverse rotation due to the reverse prevention part not being installed in place or slipping during the unlocking movement.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: A diaphragm valve, comprising: a valve body, which has an inlet, an outlet and a fluid passage connecting the two; and, the valve body is provided with a neck extending upward, and a first thread is arranged on the neck; a cover body, which has a skirt extending downward and a second thread adapted to the first thread; a diaphragm, arranged on one side of the fluid passage; a driving component, connected to the diaphragm to control the movement state of the fluid in the fluid passage; and further comprising a pressing block arranged between the valve body and the cover body; a reverse prevention part is integrally arranged on the valve body, the reverse prevention part extends upward on the outside of the neck, and a space for the reverse prevention part to be deformed by force is formed between the reverse prevention part and the neck; a limiting protrusion is arranged on the skirt; wherein, the reverse prevention part and / or the limiting protrusion have a guiding surface which is beneficial to the movement of the cover body in the locking direction. When the cover body is combined with the valve body and locked, the pressing block seals and abuts the diaphragm against the valve body; the limiting protrusion is clamped to the reverse prevention part to limit the movement of the cover body in the unlocking direction. The technical scheme has the following technical effects:

[0006] In this utility model, a check member is provided on the valve body. The check member can limit the cover threadedly connected to the valve body, preventing the cover from freely rotating in the direction of loosening from the valve body, ensuring the stable installation of the cover on the valve body. Furthermore, it ensures that the cover can press the outer ring of the diaphragm against one side of the fluid passage through the pressing block, enabling stable sealing between the diaphragm and the valve body and avoiding liquid leakage between the diaphragm and the valve body. By integrally forming the check member with the valve body, there is no need for separate installation between the check member and the valve body during installation, reducing the assembly difficulty between the cover and the valve body, and preventing the check member from failing to block the free rotation of the cover due to improper installation with the valve body, ensuring the stable operation of the check member and thus ensuring stable sealing between the circumferential side of the diaphragm and the valve body. By setting the check member to extend upward, the elasticity of the check member can be increased, making the check member more prone to deformation. By providing a space between the check member and the neck of the valve body that can cause deformation of the check member, when the cover is rotated to lock or unlock the cover with the valve body, the check member can deform into the space between the check member and the valve body, preventing the check member from breaking during the installation of the cover and the valve body. Since a guiding surface is provided on the limiting protrusion and / or the check member, the guiding surface can assist the cover in applying a force to deform the check member into the space between the check member and the valve body when the user rotates the cover, preventing the check member from breaking when moving in the locking direction. At the same time, the guiding surface makes the rotation of the cover smoother, the installation of the cover and the valve body more convenient, and the user more labor-saving.

[0007] In the above diaphragm valve, the check member has a first abutting surface that is inclined outward in the radial direction of the diaphragm valve. During the process of rotating the cover to lock the cover to the valve body, when the bottom of the limiting protrusion contacts the first abutting surface, the limiting protrusion can push the inclined first abutting surface to deform the check member, causing the upper part of the check member to bend into the space between the check member and the neck, preventing the check member from breaking and also preventing the check member from obstructing the installation of the cover and the valve body, making the assembly more labor-saving.

[0008] In the above diaphragm valve, the limiting protrusion is provided with a second abutting surface on the side away from the second thread side; the first abutting surface and the second abutting surface are oppositely arranged at the beginning of the movement in the locking direction. During the process of rotating the cover to lock the cover to the valve body, when the second abutting surface of the limiting protrusion contacts the first abutting surface, the inclined second abutting surface can assist the limiting protrusion in pushing the check member to bend and deform into the space between the check member and the neck, enabling the check member to avoid the limiting protrusion. Furthermore, the pushing of the limiting protrusion on the deformation of the check member becomes smoother, improving the installation feel. During the installation process, while the second abutting surface assists the limiting protrusion in pushing the check member, it also facilitates the rapid sliding of the limiting protrusion along the check member, reducing the wear of the limiting protrusion on the check member, extending the service life of the check member, and thus extending the service life of the valve body.

[0009] In the above-mentioned diaphragm valve, the check member includes a main body and a tooth portion provided on the outer peripheral surface of the main body; the first abutting surface includes a first section located on the main body and a second section located on the tooth portion. During the process of screwing the cover body onto the valve body, the limiting protrusion first contacts the first section and then contacts the second section, so as to continuously push the deformation of the check member by the limiting protrusion, so that the limiting protrusion pushes the deformation of the check member towards the space between the check member and the neck from the moment of contacting the check member, making the avoidance effect of the check member on the limiting protrusion better and avoiding the fracture of the check member.

[0010] In the above-mentioned diaphragm valve, the diaphragm valve includes a valve platform located outside the neck, and the connecting surface between the valve platform and the check member is an inclined surface or an arc surface. To increase the height of the check member, the increased height of the check member enables the check member to have a stronger deformation ability, that is, enhances the elasticity of the check member, making it easier for the check member to deform during installation and not prone to fracture.

[0011] In the above-mentioned diaphragm valve, the check member includes a main body and a tooth portion provided on the outer peripheral surface of the main body, and all sides of the main body are parallel to the axial extension direction of the valve body. That is, the opposite sides of the main body are respectively kept parallel, so that the thickness of the main body part of the check member is relatively uniform. When the check member is bent, it effectively avoids the fracture of the check member caused by stress concentration in the thinner part of the check member due to uneven thickness of the check member, ensures the stable deformation of the check member, prolongs the service life of the check member, and further prolongs the service life of the valve body.

[0012] In the above-mentioned diaphragm valve, the limiting protrusion is provided on the inner wall of the skirt portion, and the limiting protrusion has a guiding surface and a limiting surface that abuts against the check member when the cover body moves in the unlocking direction; the angle between the limiting surface and the skirt portion is greater than the angle between the guiding surface and the skirt portion. When installing the cover body, the cover body rotates relative to the valve body in the locking direction, and the check member slides along the guiding surface of the limiting protrusion to cross the limiting protrusion. When the cover body is to rotate freely relative to the valve body in the unlocking direction, the limiting surface abuts against the check member to prevent the cover body from freely disengaging from the valve body, realizing the limitation of the cover body, and further ensuring the stable pressing of the diaphragm on the valve body by the pressing block. By setting the angle between the limiting surface and the skirt portion to be greater than the angle between the guiding surface and the skirt portion, when installing the cover body and the valve body, because the angle between the guiding surface and the skirt portion is smaller, the check member can easily cross the limiting protrusion under the guiding action of the guiding surface, the rotation of the cover body is smoother, and the installation is more labor-saving; when the cover body is locked on the valve body, because the angle between the limiting surface and the skirt portion is larger, the limiting effect of the check member on the limiting protrusion is better, avoiding the cover body from freely disengaging from the valve body. At the same time, the inclined limiting surface can guide the check member when disassembling the cover body to assist the check member to cross the limiting protrusion.

[0013] In the above-mentioned diaphragm valve, the angle between the limiting surface and the inner wall of the skirt is not less than 90°. This greatly reduces the strength of the limiting protrusion. When the cover is rotated for disassembly and the limiting protrusion collides with the check member, the limiting protrusion is more likely to break, and the check member is protected by the breakage of the limiting protrusion.

[0014] In the above-mentioned diaphragm valve, the cross-section of the limiting protrusion in the axial direction is triangular. With the cross-section being triangular, when disassembling the cover, the limiting protrusion is more likely to break relative to the check member. By breaking the limiting protrusion, the check member is prevented from breaking, thus protecting the check member. The user only needs to replace the damaged cover without replacing the valve body with a complex structure and large volume. Since the cost of the cover is much lower than that of the valve body, the maintenance and replacement cost can be greatly reduced.

[0015] In the above-mentioned diaphragm valve, the first thread is provided on the outer side surface of the neck, and the second thread is provided on the inner side surface of the skirt. When the cover is locked on the valve body, the skirt of the cover shields the neck, making the diaphragm valve more aesthetically pleasing.

[0016] The features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0018] Figure 1 It is a cross-section of the diaphragm valve in Embodiment 1 Figure 1 ;

[0019] Figure 2 It is Figure 1 An enlarged view of part A;

[0020] Figure 3 It is a cross-section of the diaphragm valve in Embodiment 1 Figure 2 ;

[0021] Figure 4 It is Figure 3 An enlarged view of part B;

[0022] Figure 5 It is a three-dimensional view of the valve body in Embodiment 1;

[0023] Figure 6 It is Figure 5 An enlarged view of part C;

[0024] Figure 7 It is a three-dimensional view of the cover in Embodiment 1;

[0025] Figure 8 It is Figure 7 An enlarged view of part D;

[0026] Figure 9 Amplified schematic diagram of the check member in Embodiment 2;

[0027] Figure 10 Amplified schematic diagram of the limit projection in Embodiment 3.

[0028] Reference numerals:

[0029] 100, driving assembly;

[0030] 200, diaphragm;

[0031] 300, pressing block;

[0032] 400, valve body; 410, inlet; 420, outlet; 430, fluid passage; 440, valve port; 450, valve platform; 451, connection surface; 460, neck; 461, first thread; 470, deformation gap;

[0033] 500, check member; 510, main body; 520, tooth portion; 530, first abutting surface; 531, first section; 532, second section;

[0034] 600, cover body; 610, skirt portion; 611, second thread;

[0035] 700, limit projection; 710, second abutting surface; 720, limiting surface;

[0036] 800, guiding surface. Detailed implementation manners

[0037] A diaphragm valve proposed by the present utility model includes: a valve body having an inlet, an outlet, and a fluid passage connecting the two; and the valve body is provided with a neck extending upward, and a first thread is provided on the neck; a cover body having a skirt portion extending downward and a second thread adapted to the first thread; a diaphragm disposed on one side of the fluid passage; a driving assembly connected to the diaphragm for controlling the movement state of the fluid in the fluid passage; and further includes a pressing block disposed between the valve body and the cover body; a check member is integrally provided on the valve body, and the check member extends upward outside the neck, and a space for the check member to deform under force is formed between the check member and the neck; a limiting protrusion is provided on the skirt portion; wherein, the check member and / or the limiting protrusion have a guiding surface that facilitates the movement of the cover body in the locking direction. When the cover body is combined with the valve body and locked, the pressing block seals and abuts the diaphragm against the valve body; the limiting protrusion is clamped to the check member to limit the movement of the cover body in the unlocking direction. By providing a check member on the valve body, the check member can limit the cover body screwed onto the valve body, preventing the cover body from freely rotating in the direction of loosening from the valve body, ensuring the stable installation of the cover body on the valve body, and further ensuring that the cover body can press the outer ring of the diaphragm against one side of the fluid passage through the pressing block, so that a stable seal can be formed between the diaphragm and the valve body, avoiding liquid leakage between the diaphragm and the valve body. By integrally providing the check member with the valve body, there is no need to install the check member between the check member and the valve body during installation, reducing the assembly difficulty between the cover body and the valve body, and avoiding the problem that the check member cannot block the free rotation of the cover body due to improper installation between the check member and the valve body, ensuring that the check member can work stably, and further ensuring the stable seal between the periphery of the diaphragm and the valve body. By setting the check member to an upward-extending structure, the elasticity of the check member can be increased, making the check member more easily deformable. By providing a space between the check member and the neck of the valve body that can provide deformation for the check member, when the cover body is rotated to lock or unlock the cover body and the valve body, the check member can deform into the space between the check member and the valve body, avoiding the breakage of the check member when installing the cover body and the valve body. Because a guiding surface is provided on the limiting protrusion and / or the check member, the guiding surface can assist the cover body to apply a force to deform the check member into the space between the check member and the valve body when the user rotates the cover body, so that the check member can avoid the limiting protrusion on the cover body, avoiding the breakage of the check member. When the internal structure of the diaphragm valve is damaged, the cover body can be rotated to remove the cover body from the valve body for repairing and replacing its internal structure. The check member and the valve body will not be damaged and can still be reused, avoiding the problem of replacing the entire valve body due to the breakage of the check member, reducing the maintenance cost. At the same time, the guiding surface makes the rotation of the cover body smoother, the disassembly and assembly of the cover body and the valve body more convenient, and the user more labor-saving.

[0038] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0041] In the present utility model, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected with", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] In the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0043] Embodiment 1:

[0044] A diaphragm valve, as Figures 1 to 8 shown. The diaphragm valve in this embodiment is a weir valve, which includes a valve body 400, a cover body 600, a diaphragm 200, a driving assembly 100 and a pressing block 300. The valve body 400 has an inlet 410, an outlet 420 and a fluid passage 430. The fluid passage 430 is used to connect the inlet 410 and the outlet 420. A valve port 440 is provided on one side of the fluid passage 430. The diaphragm 200 is arranged at the valve port 440. The driving assembly 100 is connected to the diaphragm 200 to control the opening and closing of the fluid passage 430 by driving the deformation of the diaphragm 200, and further control the movement state of the fluid in the fluid passage 430. When the diaphragm 200 opens the valve port 440, the fluid enters the fluid passage 430 through the inlet 410 and then flows out of the fluid passage 430 through the outlet 420; when the diaphragm 200 closes the valve port 440, the fluid cannot pass through the fluid passage 430. A neck 460 is provided on the valve body 400. The neck 460 surrounds the valve port 440 and extends upward. A first thread 461 is provided on the side wall of the neck 460. A valve platform 450 is also provided on the valve body 400. The valve platform 450 surrounds the outer peripheral side of the neck 460; a skirt portion 610 is provided on the cover body 600. The skirt portion 610 is annular and extends downward. A second thread 611 is provided on the side wall of the skirt portion 610. The first thread 461 is adapted to the second thread 611 so that the skirt portion 610 is threadedly connected to the neck 460 to realize the covering of the cover body 600 on the valve body 400. The first thread 461 is arranged on the outer side surface of the neck 460, and the second thread 611 is arranged on the inner side surface of the skirt portion 610. When the cover body 600 is locked on the valve body 400, the skirt portion 610 of the cover body 600 forms an occlusion to the neck 460, making the diaphragm valve more beautiful. The pressing block 300 is arranged between the valve body 400 and the cover body 600. The pressing block 300 is located above the diaphragm 200. When the cover body 600 and the valve body 400 are in a locked state (that is, the skirt portion 610 of the cover body 600 is screwed tightly with the neck 460 of the valve body 400), the top of the pressing block 300 abuts against the cover body 600, and the lower part of the pressing block 300 abuts against the top surface of the outer peripheral side of the diaphragm 200 to press the outer edge of the diaphragm 200 against the valve body 400 on the outer peripheral side of the valve port 440, realizing the seal between the outer peripheral side of the diaphragm 200 and the valve body 400. It should be noted that the pressing block 300 and the cover body 600 in this embodiment are separately arranged, which can avoid relative rotation with the diaphragm 200 when pressing the diaphragm 200. The technical solution in the present utility model can be used for the pressing and sealing requirements of multi-layer diaphragms, preventing poor sealing between the diaphragm 200 and the valve body 400 due to excessive gap between the pressing block 300 and the valve body 400 during the pressing process of multi-layer diaphragms.

[0045] A check member 500 is further provided on the valve body 400. The check member 500 is integrally provided on the valve body 400 and is disposed on the top surface of the valve platform 450 outside the neck portion 460. The check member 500 extends upward to form a deformation gap 470 between the check member 500 and the outer side surface of the neck portion 460. The deformation gap 470 can provide a space for the deformation of the check member 500 that can be deformed under force. A limiting protrusion 700 is provided on the side wall of the skirt portion 610 facing the check member 500. Guide surfaces 800 are provided on both the limiting protrusion 700 and the check member 500. The guide surfaces 800 are conducive to the movement of the cover body 600 in the locking direction when the cover body 600 and the valve body 400 are installed. When the cover body 600 and the valve body 400 are locked, the side portion of the limiting protrusion 700 abuts against the side portion of the check member 500 to prevent the cover body 600 from freely rotating in the unlocking direction. Of course, it can be understood that the guide surface 800 in this embodiment can also be provided only on the limiting protrusion 700 or only on the check member 500.

[0046] In the present utility model, a check member 500 is provided on a valve body 400. The check member 500 can limit a cover body 600 threadedly connected to the valve body 400, preventing the cover body 600 from freely rotating in the direction of loosening from the valve body 400, ensuring the stable installation of the cover body 600 on the valve body 400. Furthermore, it ensures that the cover body 600 can press the outer ring of a diaphragm 200 against a valve port 440 on one side of a fluid passage 430 through a pressing block 300, enabling stable sealing between the diaphragm 200 and the valve body 400 and avoiding liquid leakage between the diaphragm 200 and the valve body 400. By integrally setting the check member 500 and the valve body 400, there is no need to install the check member 500 and the valve body 400 during installation, reducing the assembly difficulty and preventing the check member 500 from failing to block the free rotation of the cover body 600 due to improper installation with the valve body 400, ensuring the stable operation of the check member 500. Furthermore, stable sealing between the circumferential side of the diaphragm 200 and the valve body 400 is ensured through the pressing of the cover body 600 on the pressing block 300. By setting the check member 500 into a structure extending upward, the elastic deformation amount of the check member 500 can be increased, and it also makes the check member 500 more prone to deformation. By providing a space between the check member 500 and a neck portion 460 of the valve body 400 that can provide deformation for the check member 500, when the cover body 600 is rotated to lock or unlock the cover body 600 and the valve body 400, the check member 500 can deform into the space between the check member 500 and the valve body 400, preventing the check member 500 from breaking when installing the cover body 600 and the valve body 400. Because a guiding surface 800 is provided on a limiting protrusion 700 and / or the check member 500, the guiding surface 800 can assist the cover body 600 in applying a force to the check member 500 when the user rotates the cover body 600, causing the check member 500 to deform into the space between the check member 500 and the valve body 400. The deformed check member 500 can avoid the limiting protrusion 700 on the cover body 600, preventing the check member 500 from breaking. When the internal structure of the diaphragm valve is damaged, the cover body 600 can be rotated to remove the cover body 600 from the valve body 400 for repairing and replacing its internal structure. The check member 500 and the valve body 400 will not be damaged and can still be reused, avoiding the problem of the entire valve body 400 being replaced due to the breakage of the check member 500, reducing the maintenance cost. At the same time, the guiding surface 800 makes the rotation of the cover body 600 smoother, the disassembly and assembly of the cover body 600 and the valve body 400 more convenient, and the operation more labor-saving.

[0047] Such as Figure 5 And Figure 6As shown, the check member 500 has a first abutting surface 530 which is inclined towards the radially outer side of the diaphragm valve, that is, the first abutting surface 530 is inclined obliquely upwards towards the side away from the neck 460. During the process of rotating the cover body 600 to lock the cover body 600 to the valve body 400, when the bottom of the limit projection 700 contacts the first abutting surface 530, the limit projection 700 can push the obliquely arranged first abutting surface 530 to deform the check member 500, so that the upper part of the check member 500 bends towards the deformation gap 470 (i.e., the space between the check member 500 and the neck 460), avoiding the fracture of the check member 500 and also preventing the check member 500 from hindering the installation of the cover body 600 and the valve body 400, making the assembly more labor-saving.

[0048] As Figure 7 and Figure 8 shown, a second abutting surface 710 is provided on the limit projection 700. The second abutting surface 710 is arranged at the bottom of the limit projection 700 and is inclined towards the side of the limit projection 700 away from the skirt portion 610. At the beginning of the rotation of the cover body 600 in the direction of locking with the valve body 400, the first abutting surface 530 and the second abutting surface 710 are arranged opposite to each other. During the process of rotating the cover body 600 to lock the cover body 600 to the valve body 400, when the second abutting surface 710 of the limit projection 700 contacts the first abutting surface 530, the inclined second abutting surface 710 can assist the limit projection 700 to push the check member 500 to bend and deform towards the deformation gap 470, so that the check member 500 can avoid the limit projection 700, and further make the pushing of the limit projection 700 on the deformation of the check member 500 smoother, improving the installation feel. During the installation process, while the second abutting surface 710 assists the limit projection 700 to push the check member 500, it also facilitates the rapid sliding of the limit projection 700 along the check member 500, reducing the wear of the limit projection 700 on the check member 500 and prolonging the service life of the check member 500.

[0049] In this embodiment, the check member 500 includes a main body 510 and a tooth portion 520. The tooth portion 520 is disposed on the outer peripheral surface of the main body 510, that is, the tooth portion 520 is disposed on a surface of the main body 510 away from the neck portion 460. The top height of the tooth portion 520 is lower than the top height of the main body 510. The portion of the main body 510 higher than the tooth portion 520 is in an upwardly bulging arc shape. The first abutting surface 530 includes two sections. The first section 531 is disposed on the main body 510 higher than the tooth portion 520, and the second section 532 is disposed on the top of the tooth portion 520. During the process of screwing the cover body 600 onto the valve main body 400, the limit protrusion 700 first contacts the first section 531 and slides along the first section 531, and then contacts the second section 532 and slides along the second section 532, so as to realize the continuous pushing of the limit protrusion 700 on the deformation of the check member 500, so that the limit protrusion 700 pushes the check member 500 to deform towards the deformation gap 470 from the moment of contacting the check member 500, thereby making the check member 500 have a better avoidance effect on the limit protrusion 700 and avoiding the breakage of the check member 500. In this embodiment, all sides of the main body 510 are parallel to the axial extension direction of the valve main body 400, that is, two groups of opposite sides of the main body 510 are respectively kept parallel, so that the thickness of the main body 510 portion of the check member 500 is relatively uniform. When the check member 500 is bent, it effectively avoids the breakage of the check member 500 caused by stress concentration on the thinner part of the thickness of the check member 500 due to uneven thickness of the check member 500, ensures the stable deformation of the check member 500, prolongs the service life of the check member 500, and further prolongs the service life of the valve main body 400.

[0050] In this embodiment, there are a plurality of limit protrusions 700 arranged circumferentially. The plurality of limit protrusions 700 are equidistantly arranged on the inner side wall of the skirt portion 610 around the central axis of the cover body 600. In addition to the guiding surface 800, the limit protrusion 700 is also provided with a limiting surface 720. The guiding surface 800 and the limiting surface 720 are oppositely disposed on both sides of the limit protrusion 700. The side portion of the limit protrusion 700 also has a plane connecting the guiding surface 800 and the limiting surface 720, so that the cross-section of the limit protrusion 700 in the axial direction is trapezoidal. When installing the cover body 600, the cover body 600 rotates relative to the valve main body 400 in the locking direction, and the check member 500 slides along the guiding surface 800 of the limit protrusion 700 to cross over the limit protrusion 700. When the cover body 600 is to rotate freely relative to the valve main body 400 in the unlocking direction, the limiting surface 720 abuts against the check member 500 to prevent the cover body 600 from freely disengaging from the valve main body 400, realizing the limitation of the cover body 600, and further ensuring the stable pressing of the diaphragm 200 on the valve main body 400 by the pressing block 300.

[0051] Preferably, as Figure 4As shown, the angle between the guiding surface 800 and the skirt portion 610 is α, and the angle between the limiting surface 720 and the skirt portion 610 is β, where β > α. By setting the angle β between the limiting surface 720 and the skirt portion 610 to be greater than the angle α between the guiding surface 800 and the skirt portion 610, when installing the cover body 600 and the valve body 400, since the angle α between the guiding surface 800 and the skirt portion 610 is smaller, the check member 500 can easily cross over the limiting protrusion 700 under the guiding action of the guiding surface 800, making the rotation of the cover body 600 smoother and the installation more labor-saving; when the cover body 600 is locked onto the valve body 400, since the angle β between the limiting surface 720 and the skirt portion 610 is larger, the limiting effect of the check member 500 on the limiting protrusion 700 is better, preventing the cover body 600 from freely disengaging from the valve body 400. At the same time, the inclined limiting surface 720 can guide the check member 500 when disassembling the cover body 600 to assist the check member 500 in crossing over the limiting protrusion 700. In this embodiment, α is preferably 47° and β is preferably 78°.

[0052] Embodiment Two:

[0053] As Figure 9 shown, the difference between this embodiment and Embodiment One is that, in order to increase the height of the check member 500 in this embodiment, the connecting surface 451 of the valve platform for installing the check member is set as an inclined surface or an arc surface. The increased height of the check member makes the check member longer and has stronger deformation ability, that is, the elasticity of the check member 500 is enhanced, making the check member more easily deformable and not prone to breakage during installation. It should be noted that, as shown Figure 9 in the figure, the area of the check member 500 defined by the dotted line and the limiting surface 451 is the height-increased part.

[0054] Embodiment Three:

[0055] As Figure 10As shown, the difference between this embodiment and the first embodiment is that the guiding surface 800 of the limiting protrusion and the side of the limiting surface 720 in this embodiment are connected to each other, so that the cross-section of the limiting protrusion 700 in the axial direction is triangular. The triangular cross-section setting makes it easier for the limiting protrusion 700 to break relative to the check member when the cover body is disassembled. By breaking the limiting protrusion, the check member is prevented from breaking, thus protecting the check member. The user only needs to replace the damaged cover body, and there is no need to replace the valve main body with a complex structure and a large volume. Since the cost of the cover body is much lower than that of the valve main body, the maintenance and replacement cost can be greatly reduced. Preferably, the angle β between the limiting surface and the inner wall of the skirt is not less than 90°, preferably greater than 90°, so that the whole limiting protrusion inclines towards the limiting surface side, greatly reducing the strength of the limiting protrusion. When the cover body is rotated to be disassembled and the limiting protrusion collides with the check member, the limiting protrusion is more likely to break, and the check member is protected by the breakage of the limiting protrusion. It should be noted that in order to avoid stress concentration or burr generation on the limiting protrusion 700, chamfer transition is allowed between the guiding surface 800 and the limiting surface 720 in this embodiment.

[0056] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. Any technical solution falling within the idea of the present invention belongs to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A diaphragm valve, comprising: A valve body having an inlet, an outlet, and a fluid passage connecting the two; Moreover, the valve body is provided with a neck extending upward, and a first thread is provided on the neck; A cover body having a skirt portion extending downward and a second thread adapted to the first thread; A diaphragm disposed on one side of the fluid passage; A driving assembly connected to the diaphragm for controlling the movement state of the fluid in the fluid passage; Characterized in that: It further includes a pressing block disposed between the valve body and the cover body; A check member is integrally provided on the valve body, the check member extends upward outside the neck, and a space for the check member to deform under force is formed between the check member and the neck; A limiting protrusion is provided on the skirt portion; Wherein, the check member and / or the limiting protrusion have a guiding surface that facilitates the movement of the cover body in the locking direction. When the cover body is combined with the valve body and locked, the pressing block seals and abuts the diaphragm against the valve body; the limiting protrusion is clamped to the check member to limit the movement of the cover body in the unlocking direction.

2. The diaphragm valve according to claim 1, characterized in that, The check member has a first abutting surface inclined outward in the radial direction of the diaphragm valve.

3. A diaphragm valve according to claim 2, characterized in that, The limiting protrusion is provided with a second abutting surface on the side away from the second thread; the first abutting surface and the second abutting surface are oppositely disposed at the beginning of the movement in the locking direction.

4. A diaphragm valve according to claim 2 or 3, characterized in that, The check member includes a main body and a tooth portion provided on the outer peripheral surface of the main body; the first abutting surface includes a first section located on the main body and a second section located on the tooth portion.

5. A diaphragm valve according to claim 1, characterized in that, The diaphragm valve includes a valve platform located outside the neck, and the connection surface between the valve platform and the check member is an inclined surface or an arc surface.

6. A diaphragm valve according to claim 1, characterized in that, The check member includes a main body and a tooth portion provided on the outer peripheral surface of the main body, and all sides of the main body are parallel to the axial extension direction of the valve body.

7. A diaphragm valve according to claim 1, characterized in that, The limiting protrusion is provided on the inner wall of the skirt portion, and the limiting protrusion has a guiding surface and a limiting surface that abuts the check member when the cover body moves in the unlocking direction; the angle between the limiting surface and the skirt portion is greater than the angle between the guiding surface and the skirt portion.

8. A diaphragm valve according to claim 7, wherein, The angle between the limiting surface and the inner wall of the skirt portion is not less than 90°.

9. A diaphragm valve according to claim 7, characterized in that, The cross-section of the limiting protrusion in the axial direction is triangular.

10. A diaphragm valve according to any one of claims 1 to 3, characterized in that, The first thread is provided on the outer side surface of the neck, and the second thread is provided on the inner side surface of the skirt portion.

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