Vacuum diaphragm valve

Abstract

The utility model relates to the technical field of vacuum valves, and discloses a vacuum diaphragm valve which comprises a valve body, a valve cover, a diaphragm piece and a diaphragm piece limiting structure. The valve cover covers the valve body, and a sealed space is defined by the valve cover and the valve body; the diaphragm piece is arranged in the sealed space, and the edge of the diaphragm piece is clamped in a mounting gap between the valve cover and the edge of the valve body; the diaphragm piece limiting structure is arranged at the position where the edge of the diaphragm piece is matched with the installation gap, and the diaphragm piece limiting structure prevents the edge of the diaphragm piece from being separated from the installation gap. The diaphragm piece is limited through the diaphragm piece limiting structure, the edge of the diaphragm piece can be prevented from being separated from an installation gap, stable installation and work of the diaphragm piece are guaranteed, the sealing effect of a sealed space is guaranteed, the communication or cut-off effect of the diaphragm valve on the valve body is guaranteed, then the work stability of the vacuum diaphragm valve is improved, and the work service life of the vacuum diaphragm valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum valves, in particular to a vacuum diaphragm valve. Background Art

[0002] A vacuum diaphragm valve is a valve that uses a valve stem to press or separate a rubber diaphragm against the valve body sealing weir to cut off or connect the vacuum system.

[0003] Usually, the diaphragm is sandwiched between the valve body and the valve cover, and the surface where the diaphragm is sandwiched is a plane. The valve body and the valve cover are then fixed by a fixing member to clamp the diaphragm. During the operation of this vacuum diaphragm valve, since the diaphragm will repeatedly deform to cut off or connect the vacuum system, the part of the diaphragm sandwiched between the valve body and the valve cover is prone to displacement, which reduces the sealing effect of the diaphragm valve and affects the vacuum degree of the vacuum diaphragm valve. Utility Model Content

[0004] In view of this, the utility model provides a vacuum diaphragm valve to solve the problem that the portion of the diaphragm of the existing vacuum diaphragm valve sandwiched between the valve body and the valve cover is easily displaced, which reduces the sealing effect of the diaphragm valve and affects the vacuum degree of the vacuum diaphragm valve.

[0005] In a first aspect, the utility model provides a vacuum diaphragm valve, comprising:

[0006] Valve body;

[0007] A valve cover, which is disposed on the valve body, and the valve cover and the valve body are surrounded to form a sealed space;

[0008] A diaphragm is arranged in the sealing space, and the edge of the diaphragm is clamped in the installation gap between the valve cover and the edge of the valve body;

[0009] The diaphragm limiting structure is arranged at a position where the edge of the diaphragm and the installation gap match each other, and the diaphragm limiting structure prevents the edge of the diaphragm from leaving the installation gap.

[0010] Beneficial effect: A sealed space is formed by the valve body and the valve cover, and the diaphragm is arranged in the sealed space to connect or cut off the cavity of the valve body. The edge of the diaphragm is clamped in the installation gap between the valve cover and the edge of the valve body, and the diaphragm is limited by the diaphragm limiting structure, which can prevent the edge of the diaphragm from escaping from the installation gap, thereby ensuring the stable installation and operation of the diaphragm, ensuring the sealing effect of the sealed space, and ensuring the connection or cutoff effect of the diaphragm valve on the valve body, thereby improving the working stability and service life of the vacuum diaphragm valve.

[0011] In an optional embodiment, the edge of the diaphragm is arranged in the installation gap along the first direction, and the diaphragm limiting structure prevents the edge of the diaphragm from moving inward along the first direction and leaving the installation gap.

[0012] Beneficial effect: The diaphragm limiting structure can prevent the edge of the diaphragm from moving inward along the first direction and leaving the installation gap, ensuring that the diaphragm is installed firmly and stably.

[0013] In an optional embodiment, the diaphragm limiting structure includes a first limiting portion and a second limiting portion that cooperate with each other, one of the first limiting portion and the second limiting portion is arranged on the edge of the diaphragm, and the other is arranged on the inner wall of the installation gap.

[0014] Beneficial effect: The first limiting part and the second limiting part can ensure the limiting effect on the diaphragm through the above-mentioned arrangement, can reduce the difficulty of manufacturing and installing the vacuum diaphragm valve, and can facilitate the maintenance of the vacuum diaphragm valve and the maintenance and replacement of the diaphragm.

[0015] In an optional embodiment, the first limiting portion is a limiting protrusion protruding from the diaphragm, and the limiting protrusion is arranged on the side of the diaphragm facing the valve body and / or the side facing the valve cover, and the second limiting portion includes a limiting platform, and the limiting platform is arranged at a position where the valve body and / or the valve cover form the inner wall of the installation gap, and the limiting protrusion is clamped with the limiting platform.

[0016] Beneficial effects: The structures of the limiting protrusion and the limiting platform are simple and easy to design and manufacture, and a good limiting effect is achieved through the simple structure, which effectively prevents the edge of the diaphragm valve from coming out of the installation gap.

[0017] In an optional embodiment, the limiting protrusion abuts against the valve cover on a side facing the valve cover, and / or the limiting protrusion abuts against the valve body on a side facing the valve body.

[0018] Beneficial effect: The limiting protrusion abuts against the valve body and / or the valve cover, thereby ensuring the sealing of the sealing space, and preventing gas from entering the sealing space through the installation gap and affecting the vacuum effect of the vacuum system.

[0019] In an optional embodiment, the side of the limit platform facing the diaphragm is in contact with the diaphragm.

[0020] Beneficial effect: while further enhancing the sealing performance, the diaphragm can be better limited, so as to prevent the first limiting part from shaking in the installation gap and affecting the cut-off effect of the diaphragm on the first chamber and the second chamber.

[0021] In an optional embodiment, a valve cover limiting structure is further included, and the valve cover limiting structure is arranged at a position where the valve body and the valve cover cooperate with each other.

[0022] Beneficial effects: If the valve cover is installed too deep, the space of the installation gap will be compressed, resulting in excessive pressure on the edge of the diaphragm, which will cause the diaphragm to deform, easily causing damage to the diaphragm and affecting the service life of the diaphragm. The valve cover limiting structure can ensure that the valve cover is in the correct position relative to the valve body, avoiding excessive squeezing of the edge of the diaphragm due to installation problems, and avoiding deformation or damage of the diaphragm; at the same time, it can also ensure the coaxial setting of the valve cover and the valve body, reducing the difficulty of installing the valve cover and the valve body.

[0023] In an optional embodiment, the valve cover limiting structure includes a limiting groove and a limiting block that cooperate with each other, one of the limiting groove and the limiting block is arranged on the valve body, and the other is arranged on the valve cover.

[0024] Beneficial effects: The method of limiting the valve cover by the limiting groove and the limiting block is simple and effective, and also reduces the installation error rate and the manufacturing difficulty of the valve body and the valve cover.

[0025] In an optional embodiment, the limiting groove is arranged on the valve body, and the opening of the limiting groove faces the valve cover, the limiting block is arranged on the outer wall of the valve cover, the end of the valve cover facing the valve body is suitable for inserting into the limiting groove, and the limiting block abuts against the edge of the limiting groove on the side facing the valve body.

[0026] Beneficial effect: When the valve cover is inserted into the limit groove toward one end of the valve body, the limit block will abut against the edge of the limit groove to prevent the valve cover from continuing to move, so that the valve cover can be in the correct position. During installation, the operator can also connect it more easily to avoid excessive compression of the valve cover on the diaphragm.

[0027] In an optional embodiment, the bottom surface of the limiting groove and the edge of the valve cover facing one end of the valve body form the installation gap.

[0028] Beneficial effects: The structure of the valve cover and the valve body is simplified, the manufacturing difficulty of the valve body and the valve cover is reduced, and the manufacturing cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic structural diagram of a vacuum diaphragm valve according to an embodiment of the utility model;

[0031] Figure 2 A cross-sectional view of a vacuum diaphragm valve according to an embodiment of the utility model;

[0032] Figure 3 This is a schematic structural diagram of a valve body according to an embodiment of the utility model;

[0033] Figure 4 A cross-sectional view of a valve body according to an embodiment of the utility model;

[0034] Figure 5 This is a schematic structural diagram of a valve cover according to an embodiment of the utility model;

[0035] Figure 6 A cross-sectional view of a valve cover according to an embodiment of the utility model;

[0036] Figure 7 A schematic diagram of the structure of a diaphragm sheet according to an embodiment of the utility model;

[0037] Figure 8 A cross-sectional view of a diaphragm sheet according to an embodiment of the utility model;

[0038] Fig. 9 This is a schematic diagram of the structure of a valve core according to an embodiment of the utility model;

[0039] Fig.10 This is a structural schematic diagram of a connecting piece according to an embodiment of the utility model;

[0040] Fig.11 This is a schematic diagram of the matching of a valve core and a diaphragm connecting piece according to an embodiment of the utility model;

[0041] Fig.12 yes Figure 2 Enlarged view of point A in the middle.

[0042] Description of reference numerals:

[0043] 1. valve body; 11. sealing weir; 12. first chamber; 13. second chamber; 14. positioning groove;

[0044] 2. Valve cover; 21. Anti-rotation groove;

[0045] 3. diaphragm; 31. sealing strip; 32. sealing protrusion; 33. mounting groove; 331. second anti-rotation surface; 34. positioning protrusion;

[0046] 4. Diaphragm limiting structure; 41. First limiting portion; 42. Second limiting portion; 421. Limiting platform;

[0047] 5. Valve cover limiting structure; 51. Limiting groove; 52. Limiting block;

[0048] 6. Driving mechanism; 61. Valve stem; 611. First limiting ring; 62. Valve stem nut; 63. Pin; 64. Hand wheel; 65. Limiting nut; 651. Second limiting ring;

[0049] 7. valve core; 71. through hole; 72. positioning groove; 73. anti-rotation protrusion;

[0050] 8. Connecting piece; 81. Mounting platform; 811. First anti-rotation surface; 82. Positioning platform. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0052] Combine the following Figures 1 to 12 , describing an embodiment of the vacuum diaphragm valve of the utility model.

[0053] According to an embodiment of the utility model, on the one hand, a vacuum diaphragm valve is provided, comprising a valve body 1, a valve cover 2, a diaphragm 3 and a diaphragm limiting structure 4. The valve cover 2 is covered on the valve body 1, and the valve cover 2 and the valve body 1 are surrounded to form a sealed space; the diaphragm 3 is arranged in the sealed space, and the edge of the diaphragm 3 is clamped in the installation gap between the valve cover 2 and the edge of the valve body 1; the diaphragm limiting structure 4 is arranged at a position where the edge of the diaphragm 3 and the installation gap match, and the diaphragm limiting structure 4 prevents the edge of the diaphragm 3 from leaving the installation gap.

[0054] The vacuum diaphragm valve provided in this embodiment forms a sealed space through the valve body 1 and the valve cover 2. The diaphragm 3 is arranged in the sealed space to connect or cut off the chamber of the valve body 1. The edge of the diaphragm 3 is clamped in the installation gap between the valve cover 2 and the edge of the valve body 1, and the diaphragm 3 is limited by the diaphragm limiting structure 4, which can prevent the edge of the diaphragm 3 from escaping from the installation gap, thereby ensuring the stable installation and operation of the diaphragm 3, ensuring the sealing effect of the sealed space, and ensuring the connection or cutoff effect of the diaphragm valve on the valve body 1, thereby improving the working stability and service life of the vacuum diaphragm valve.

[0055] Specifically, the valve body 1 is provided with a sealing weir 11, which protrudes toward the inner side of the valve body 1. Figure 1Taking the perspective as an example, a sealing weir 11 is protruding upward in the valve body 1. The sealing weir 11 divides the valve body 1 into a first chamber 12 and a second chamber 13. The diaphragm 3 fixed to the sealed space by the valve body 1, the valve cover 2 and the diaphragm limiting structure 4 makes the first chamber 12 and the second chamber 13 connected or cut off through its own deformation: when the diaphragm 3 abuts against the sealing weir 11, the diaphragm 3 cuts off the first chamber 12 and the second chamber 13 (the first chamber 12 and the second chamber 13 are not connected), and when the diaphragm 3 separates from the sealing weir 11, the first chamber 12 and the second chamber 13 are connected. The vacuum diaphragm valve is usually connected to a vacuum system, and the vacuum diaphragm valve is used to control the on and off of the vacuum system through the above-mentioned setting.

[0056] Furthermore, the diaphragm 3 is provided with a sealing strip 31, and when the diaphragm 3 abuts against the sealing weir, the sealing strip 31 is connected to the sealing weir 11. The sealing strip 31 can enhance the sealing effect of the diaphragm 3 and the sealing weir 11, thereby improving the cutoff effect of the first chamber 12 and the second chamber 13.

[0057] Furthermore, the valve body 1 is provided with a positioning groove 14, and the diaphragm 3 is provided with a positioning protrusion 34, and the positioning protrusion 34 is connected to the positioning groove 14. The connection between the positioning protrusion 34 and the positioning groove 14 can facilitate the operator to install the diaphragm 3, and can prevent the diaphragm 3 from rotating when it is separated from the sealing weir 11, thereby ensuring that the sealing strip 31 and the sealing weir 11 can be closely matched each time in the cut-off state.

[0058] Specifically, the edge of the diaphragm 3 is arranged in the installation gap along the first direction, and the diaphragm limiting structure 4 prevents the edge of the diaphragm 3 from moving inward along the first direction and leaving the installation gap. Figure 2 As shown, the first direction refers to the horizontal direction (perpendicular to the height direction of the vacuum diaphragm valve, Figure 2 The diaphragm limiting structure 4 can prevent the edge of the diaphragm 3 from moving inwards along the first direction and leaving the installation gap, ensuring that the diaphragm 3 is firmly and stably installed. It should be noted that in this embodiment, the edge of the diaphragm 3 is circular, and the diaphragm limiting structure 4 is annular, so Figure 1 The first direction actually refers to the radial direction of the diaphragm 3. The diaphragm limiting structure 4 can also limit various positions of the edge of the diaphragm 3 to prevent the edge of the diaphragm 3 from moving radially inward and out of the installation gap, thereby ensuring the sealing of the sealed space and further ensuring the vacuum diaphragm valve's cutoff and connection effects on the vacuum system.

[0059] Specifically, the diaphragm limiting structure 4 includes a first limiting portion 41 and a second limiting portion 42 that cooperate with each other, one of which is arranged at the edge of the diaphragm 3, and the other is arranged at the inner wall of the installation gap. The first limiting portion 41 and the second limiting portion 42 can ensure the limiting effect of the diaphragm 3 through the above arrangement, reduce the difficulty of manufacturing and installing the vacuum diaphragm valve, and facilitate the maintenance and replacement of the diaphragm 3.

[0060] Specifically, the first limiting portion 41 is a limiting protrusion protruding from the diaphragm 3, and the limiting protrusion is arranged on the side of the diaphragm 3 facing the valve body 1 and / or the side facing the valve cover 2. The second limiting portion 42 includes a limiting platform 421, and the limiting platform 421 is arranged at the position where the valve body 1 and / or the valve cover 2 form the inner wall of the installation gap, and the limiting protrusion is engaged with the limiting platform 421. The limiting protrusion and the limiting platform 421 have a simple structure, are easy to design and manufacture, and achieve a good limiting effect through a simple structure, effectively preventing the edge of the diaphragm valve from coming out of the installation gap.

[0061] In this embodiment, limiting protrusions are provided on the side of the diaphragm 3 facing the valve body 1 and the side facing the valve cover 2. Correspondingly, two limiting platforms 421 are also provided on the inner wall of the installation gap formed by the valve body 1 and the valve cover 2. Each limiting protrusion is clamped with a limiting platform 421, thereby enhancing the limiting effect of the diaphragm limiting structure 4 on the diaphragm 3.

[0062] In other embodiments, only one limit protrusion and one limit platform 421 may be provided, that is, the limit protrusion is provided on the side of the diaphragm 3 facing the valve body 1 or the side facing the valve cover 2, and the limit platform 421 is provided accordingly, which can reduce the manufacturing difficulty and manufacturing cost.

[0063] Furthermore, the side of the limiting protrusion facing the valve cover 2 abuts against the valve cover 2, and / or the side of the limiting protrusion facing the valve body 1 abuts against the valve body 1. The abutment of the limiting protrusion with the valve body 1 and / or the valve cover 2 ensures the sealing of the sealed space, and prevents gas from entering the sealed space through the installation gap to affect the vacuum effect of the vacuum system.

[0064] Furthermore, the side of the limiting platform 421 facing the diaphragm 3 abuts against the diaphragm 3. The limiting platform 421 cooperates with the above-mentioned limiting protrusion to further enhance the sealing performance and better limit the diaphragm 3, thereby preventing the first limiting portion 41 from shaking in the installation gap and affecting the truncation effect of the diaphragm 3 on the first chamber 12 and the second chamber 13.

[0065] Furthermore, the diaphragm 3 is also provided with a sealing protrusion 32, which is arranged at the edge of the lower side of the diaphragm 3. The limit platform 421 is facing the side of the diaphragm 3 and close to the edge of the diaphragm 3, and abuts against the sealing protrusion 32 to enhance the sealing effect. The limit platform 421 is facing the side of the diaphragm 3 away from the edge of the diaphragm 3 and has a certain gap with the diaphragm 3, so that a movable margin is formed between the diaphragm 3 and the limit platform 421, so that the diaphragm 3 can be deformed more easily, and the friction between the diaphragm 3 and the limit platform 421 can be reduced, thereby extending the service life of the diaphragm 3.

[0066] Furthermore, the vacuum diaphragm valve also includes a valve cover limiting structure 5, which is arranged at the position where the valve body 1 and the valve cover 2 match. If the valve cover 2 is installed too deep, the space of the installation gap will be compressed, resulting in excessive pressure on the edge of the diaphragm 3, which will cause the edge of the diaphragm 3 to deform, which is easy to cause damage to the diaphragm 3 and affect the service life of the diaphragm 3. The valve cover limiting structure 5 can ensure that the valve cover 2 is in the correct position relative to the valve body 1, avoid excessive squeezing of the edge of the diaphragm 3 due to installation problems, and avoid deformation or damage to the diaphragm 3; at the same time, it can also ensure the coaxial arrangement of the valve cover 2 and the valve body 1, reducing the difficulty of installing the valve cover 2 and the valve body 1.

[0067] Specifically, the valve cover limiting structure 5 includes a limiting groove 51 and a limiting block 52 that cooperate with each other, one of which is provided on the valve body 1, and the other is provided on the valve cover 2. The method of limiting the valve cover 2 by the limiting groove 51 and the limiting block 52 is simple and effective, and also reduces the installation error rate and the manufacturing difficulty of the valve body 1 and the valve cover 2.

[0068] Specifically, the limiting groove 51 is provided in the valve body 1, and the opening of the limiting groove 51 faces the valve cover 2, the limiting block 52 is provided on the outer wall of the valve cover 2, and the end of the valve cover 2 facing the valve body 1 is suitable for being inserted into the limiting groove 51, and the side of the limiting block 52 facing the valve body 1 abuts against the edge of the limiting groove 51. When the end of the valve cover 2 facing the valve body 1 is inserted into the limiting groove 51, the limiting block 52 abuts against the edge of the limiting groove 51 to prevent the valve cover 2 from moving further, so that the valve cover 2 can be in the correct position, avoiding excessive compression of the edge of the diaphragm 3, and during installation, the operator can also make the connection more easily, avoiding the situation where the valve cover 2 is over-pressed on the diaphragm 3.

[0069] Specifically, a mounting gap is formed between the bottom surface of the limiting groove 51 and the edge of the valve cover 2 facing one end of the valve body 1. The structure of the valve cover 2 and the valve body 1 is simplified, the manufacturing difficulty of the valve body 1 and the valve cover 2 is reduced, and the manufacturing cost is saved.

[0070] Furthermore, the vacuum diaphragm valve further comprises a driving mechanism 6 and a valve core 7, wherein the driving mechanism 6 is connected to one end of the valve cover 2 away from the valve body 1, the valve core 7 is movably arranged in the valve cover 2, one end of the valve core 7 is connected to the driving end of the driving mechanism 6, and the other end of the valve core 7 is detachably connected to the diaphragm 3 through a connecting piece 8, so as to facilitate the cleaning and replacement of the diaphragm 3. The driving mechanism 6 can drive the diaphragm 3 to deform, so that the middle part of the diaphragm 3 moves toward the sealing weir 11 or moves away from the sealing weir 11, thereby switching the connection and cutoff states of the first chamber 12 and the second chamber 13.

[0071] Specifically, the middle portion of the diaphragm 3 is recessed downward to form a mounting groove 33. Fig.10 As shown, a mounting platform 81 is provided at one end of the connecting member 8, and a positioning platform 82 is provided at the other end of the connecting member 8. The valve core 7 is provided with a through hole 71 and a positioning groove 72. The mounting platform 81 is arranged and fixed in the mounting groove 33 through the deformation property of the diaphragm 3. The upper wall of the mounting groove 33 abuts against the upper wall of the mounting platform 81 to fix the connecting member 8; the middle part of the positioning groove 72 intersects with the middle part of the through hole 71 and the through hole 71 passes through the bottom of the positioning groove 72. The positioning platform 82 can be passed through the through hole 71 to the valve core 7, and then the positioning platform 82 is rotated to make the positioning platform 82 clamped in the positioning groove 72, so as to realize the detachable connection between the valve core 7 and the diaphragm 3. The connection method is simple and convenient, which is convenient for disassembly and installation, and improves the efficiency of maintenance of the vacuum diaphragm valve.

[0072] Furthermore, a first anti-rotation surface 811 is provided on the side of the mounting platform 81, and a second anti-rotation surface 331 is provided on the inner wall of the mounting groove 33. The first anti-rotation surface 811 and the second anti-rotation surface 331 cooperate to prevent relative rotation between the connecting member 8 and the diaphragm 3, and cooperate with the positioning protrusion 34 of the diaphragm 3 and the positioning groove 14 of the valve body 1 to further prevent relative rotation between the diaphragm 3 and the connecting member 8, thereby ensuring the sealing effect.

[0073] Specifically, the driving mechanism 6 includes a valve stem 61 and a valve stem nut 62. The valve stem nut 62 is rotatably connected to the valve cover 2. The valve stem 61 is threadedly connected to the valve stem nut 62. One end of the valve stem 61 extends into the valve cover 2 and is connected to the valve core 7 via a pin 63. The other end of the valve stem 61 extends out of the valve cover 2. By rotating the valve stem nut 62, the valve stem 61 can drive the valve core 7 to move up and down, so that the diaphragm 3 is deformed, thereby completing the switching of connecting or cutting off the rotation of the first chamber 12 and the second chamber 13.

[0074] Furthermore, the inner wall of the valve cover 2 is provided with an anti-rotation groove 21, and the outer wall of the valve core 7 is provided with an anti-rotation protrusion 73. The anti-rotation protrusion 73 is connected to the anti-rotation groove 21, which can limit the rotation of the valve core 7, thereby limiting the rotation of the valve stem 61, and then the position of the valve stem 61 can be accurately adjusted through the valve stem nut 62.

[0075] Furthermore, the driving mechanism 6 further includes a hand wheel 64, and the hand wheel 64 is fixedly connected to the valve stem nut 62. The operator only needs to rotate the hand wheel 64 to drive the valve stem nut 62 to rotate, thereby adjusting the position of the valve stem 61, which reduces the difficulty of operation.

[0076] Furthermore, the driving mechanism 6 also includes a limiting nut 65, which is threadedly connected to the handwheel 64, the valve stem 61 is passed through the limiting nut 65, a first limiting ring 611 is provided in the middle of the valve stem 61, and the limiting nut 65 is provided with a second limiting ring 651. The second limit ring 651 can abut against the first limit ring 611 to limit the valve stem 61 from continuing to move toward the valve body 1, thereby avoiding excessive movement of the valve stem 61 and causing damage to the diaphragm 3 or the valve body 1, and extending the life of the diaphragm 3 and the valve body 1; through the threaded connection between the limit nut 65 and the handwheel 64, the limit nut 65 can adjust its position relative to the handwheel 64, and then adjust the position of the second limit ring 651, thereby eliminating the influence caused by manufacturing errors or assembly errors, and ensuring that when the first limit ring 611 abuts against the second limit ring 651, the diaphragm 3 abuts against the sealing weir 11 to form a good sealing effect, and will not cause a large extrusion force on the diaphragm 3 and the sealing weir 11.

[0077] The basic working process of the vacuum diaphragm valve provided by the utility model is as follows:

[0078] When the vacuum diaphragm valve is in the cut-off state, the operator rotates the valve stem in the second direction (clockwise or counterclockwise around the axis of the valve stem. In this embodiment, the second direction is as follows: Figure 1 The hand wheel 64 is rotated clockwise as shown in the middle direction A-A' to drive the stem nut 62 to rotate. The stem nut 62 drives the valve core 7 to move upward due to the rotation limit of the valve core 7, thereby driving the middle part of the diaphragm 3 to deform upward. At this time, the middle part of the diaphragm 3 is separated from the sealing weir 11, and the first chamber 12 is connected to the second chamber 13. The diaphragm limiting structure 4 limits the edge of the diaphragm 3 to prevent the diaphragm 3 from rising excessively, causing the edge to move inward and detach from the installation gap;

[0079] When the vacuum diaphragm valve is in a connected state, the operator rotates the handwheel 64 in the third direction to drive the valve stem nut 62 to rotate, wherein the third direction is opposite to the second direction, and the valve stem nut 62 will drive the valve core 7 to move downward due to the rotation limit of the valve core 7, thereby driving the middle part of the diaphragm 3 to deform downward until the sealing strip 31 abuts against the sealing weir 11. At this time, the first chamber 12 and the second chamber 13 are cut off, and the diaphragm limiting structure 4 will limit the edge of the diaphragm 3 to prevent the edge from escaping from the installation gap due to the repeated rising and falling process of the diaphragm 3.

[0080] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A vacuum diaphragm valve, characterized in that: include: A valve body (1), wherein the valve body (1) is provided with a sealing weir (11); A valve cover (2) is arranged on the valve body (1), and the valve cover (2) and the valve body (1) are arranged to form a sealed space; A diaphragm (3) is arranged in the sealing space, and the edge of the diaphragm (3) is clamped in the installation gap between the valve cover (2) and the edge of the valve body (1). The diaphragm (3) is provided with a sealing strip (31) and a sealing protrusion (32). When the diaphragm (3) abuts against the sealing weir, the sealing strip (31) is connected to the sealing weir (11), and the sealing protrusion (32) is arranged at the edge of the lower side of the diaphragm (3); A diaphragm limiting structure (4) is arranged at a position where the edge of the diaphragm (3) and the installation gap match, and the diaphragm limiting structure (4) prevents the edge of the diaphragm (3) from escaping from the installation gap, and the diaphragm limiting structure (4) includes a first limiting portion (41) and a second limiting portion (42) that match each other, and the second limiting portion (42) includes a limiting platform (421), and the limiting platform (421) has a certain gap between its position on the side of the diaphragm (3) away from the edge of the diaphragm (3) and the diaphragm (3).

2. The vacuum diaphragm valve according to claim 1, characterized in that: The edge of the diaphragm (3) is arranged in the installation gap along a first direction, and the diaphragm limiting structure (4) prevents the edge of the diaphragm (3) from moving inwardly along the first direction and leaving the installation gap.

3. The vacuum diaphragm valve according to claim 1, characterized in that: One of the first limiting portion (41) and the second limiting portion (42) is arranged on the edge of the diaphragm (3), and the other is arranged on the inner wall of the installation gap.

4. The vacuum diaphragm valve according to claim 3, characterized in that: The first limiting portion (41) is a limiting protrusion protruding from the diaphragm (3), and the limiting protrusion is arranged on the side of the diaphragm (3) facing the valve body (1) and / or the side of the valve cover (2). The limiting platform (421) is arranged at a position where the valve body (1) and / or the valve cover (2) form the inner wall of the installation gap, and the limiting protrusion is snap-connected with the limiting platform (421).

5. The vacuum diaphragm valve according to claim 4, characterized in that: The limiting protrusion abuts against the valve cover (2) on the side facing the valve cover (2), and / or the limiting protrusion abuts against the valve body (1) on the side facing the valve body (1).

6. The vacuum diaphragm valve according to claim 4, characterized in that: The limiting platform (421) is in contact with the diaphragm (3) on the side facing the diaphragm (3).

7. The vacuum diaphragm valve according to any one of claims 1 to 6, characterized in that: It also comprises a valve cover limiting structure (5), wherein the valve cover limiting structure (5) is arranged at a position where the valve body (1) and the valve cover (2) match.

8. The vacuum diaphragm valve according to claim 7, characterized in that: The valve cover limiting structure (5) comprises a limiting groove (51) and a limiting block (52) that cooperate with each other, one of the limiting groove (51) and the limiting block (52) being arranged on the valve body (1), and the other being arranged on the valve cover (2).

9. The vacuum diaphragm valve according to claim 8, characterized in that: The limiting groove (51) is arranged on the valve body (1), and the opening of the limiting groove (51) faces the valve cover (2); the limiting block (52) is arranged on the outer wall of the valve cover (2); one end of the valve cover (2) facing the valve body (1) is suitable for being inserted into the limiting groove (51); and one side of the limiting block (52) facing the valve body (1) abuts against the edge of the limiting groove (51).

10. The vacuum diaphragm valve according to claim 9, characterized in that: The bottom surface of the limiting groove (51) and the edge of the valve cover (2) facing one end of the valve body (1) form the installation gap.

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