Diaphragm valve diaphragm fixing mechanism and diaphragm valve

Abstract

The application discloses a diaphragm valve diaphragm fixing mechanism and a diaphragm valve. The diaphragm valve diaphragm fixing mechanism comprises a diaphragm, a first pressing part and a second pressing part. The diaphragm has a circular shape. The first pressing part and the second pressing part are arranged around the edge of the diaphragm, and the second pressing part is located on the side of the first pressing part away from the diaphragm. The circular diaphragm of the diaphragm valve diaphragm fixing mechanism is fixed through the first pressing part and the second pressing part, thereby ensuring that the diaphragm is uniformly stressed in the circumference and avoiding the problem that the diaphragm is unevenly pressed due to screwing. Moreover, the elastic pressing force provided by the second pressing part can play a damping and buffering role, thereby ensuring the sealing property of the diaphragm and being beneficial to prolonging the service life of the diaphragm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diaphragm valve diaphragm fixing, and more particularly, to a diaphragm valve diaphragm fixing mechanism and a diaphragm valve. BACKGROUND

[0002] The opening and closing part of the diaphragm valve is a diaphragm, which separates the lower valve body cavity from the upper cylinder or valve cover cavity, so that the valve rod, valve flap and other parts located above the diaphragm are not corroded by the medium, and the medium does not leak out.

[0003] The diaphragm of the existing diaphragm valve is fixed by four screws. This fixing method has the following defects: (1) The operation of tightening the screws causes the diaphragm to be squeezed and unevenly stressed during the assembly of the diaphragm valve. The repeated high-temperature sterilization and cooling working environment of the diaphragm valve during use can cause the diaphragm to loosen and leak, and the diaphragm needs to be tightened regularly to ensure the sealing of the diaphragm valve; (2) The screw fixing hole of the diaphragm is deformed into a waist-shaped hole after long-term use, causing the diaphragm to leak.

[0004] Therefore, how to provide a mechanism for stably and reliably fixing the diaphragm of a diaphragm valve has become a technical problem to be solved in the field. SUMMARY

[0005] An object of the present application is to provide a new technical solution for a mechanism for stably and reliably fixing the diaphragm of a diaphragm valve.

[0006] According to a first aspect of the present application, a diaphragm valve diaphragm fixing mechanism is provided.

[0007] The diaphragm valve diaphragm fixing mechanism includes a diaphragm, a first pressing member and a second pressing member. The diaphragm has a circular shape. The first pressing member and the second pressing member are arranged around the edge of the diaphragm, and the second pressing member is located on the side of the first pressing member away from the diaphragm to provide an elastic pressing force to the first pressing member.

[0008] Optionally, a circumferential protrusion is provided on the surface of the diaphragm in the thickness direction.

[0009] Optionally, a pressing fitting part is provided on the surface of the diaphragm in the width direction. The pressing fitting part is located at the edge of the diaphragm and extends towards the direction of the second pressing member. A pressing fitting surface is provided on the first pressing member and abuts against the pressing fitting part.

[0010] Optionally, the included angle between the pressing fitting surface and the moving direction of the valve rod of the diaphragm valve is an acute angle.

[0011] Optionally, a supporting surface and a lower recess are arranged on the surface of the diaphragm in the width direction, the supporting surface is located between the press-fitting part and the lower recess, and the lower recess is located in the central region of the diaphragm.

[0012] The first press part comprises a lower press surface and a lower press part, the lower press surface is located between the lower press part and the press-fitting surface, the lower press surface is in close contact with the supporting surface, and the lower press part extends towards the direction of the lower recess.

[0013] Optionally, the second press part is a round wire wave spring.

[0014] Optionally, a first supporting surface and a second supporting surface are arranged on the surface of the first press part away from the diaphragm, and the first supporting surface and the second supporting surface are not coplanar.

[0015] The diaphragm valve diaphragm fixing mechanism comprises two second press parts, and the two second press parts are respectively supported on the first supporting surface and the second supporting surface.

[0016] Optionally, the second supporting surface is higher than the first supporting surface, and the second supporting surface is located in the inner ring of the first press part.

[0017] According to a second aspect of the present application, a diaphragm valve is provided.

[0018] The diaphragm valve comprises a valve body, a valve cover, and the diaphragm valve diaphragm fixing mechanism of the present application, the valve cover is provided with a second press part cavity, and the second press part is located in the second press part cavity.

[0019] Optionally, a side blocking wall is arranged on the valve cover, the side blocking wall is in abutment with the valve body, and the diaphragm and the first press part are located on one side of the inner wall surface of the side blocking wall.

[0020] The diaphragm of the diaphragm valve diaphragm fixing mechanism of the present application is circular, and the diaphragm is fixed by the first press part and the second press part, which ensures that the diaphragm is uniformly stressed in the circumferential direction and avoids the problem of uneven stress caused by the extrusion of the diaphragm due to screw fixation. Moreover, the elastic press force provided by the second press part can attenuate the vibration of the pipeline and buffer the pressure of the medium, thereby ensuring the sealing property of the diaphragm and being conducive to prolonging the service life of the diaphragm.

[0021] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0023] Figure 1 Structure diagram of a diaphragm valve diaphragm fixing mechanism embodiment of the present disclosure.

[0024] Figure 2 Exploded view of a diaphragm valve embodiment of the present disclosure.

[0025] Figure 3 Sectional view of a diaphragm valve embodiment of the present disclosure from one perspective.

[0026] Figure 4 Sectional view of a diaphragm valve embodiment of the present disclosure from another perspective.

[0027] The figures are marked as follows:

[0028] Diaphragm-1, annular protrusion-11, press-fit portion-12, support surface-13, lower recess-14, first presser-2, press-fit surface-21, lower press surface-22, lower press portion-23, first support surface-24, second support surface-25, second presser-3, valve body-4, valve cover-5, second presser cavity-51, side barrier-52. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the figures. Note that the relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present invention unless specifically stated otherwise.

[0030] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the present invention and its applications or uses.

[0031] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be considered part of the specification.

[0032] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0033] As Figures 1 to 4As shown, the diaphragm valve diaphragm fixing mechanism of the present disclosure includes a diaphragm 1, a first compression member 2, and a second compression member 3. The diaphragm 1 has a circular shape, and the circular diaphragm 1 has the advantage of uniform stress. The first compression member 2 and the second compression member 3 are both arranged around the edge of the diaphragm 1, and the second compression member 3 is located on the side of the first compression member 2 away from the diaphragm 1 to provide elastic compression force to the first compression member 2. The first compression member 2 is in direct contact with the surface of the diaphragm 1. The first compression member 2 has a ring structure. The material of the first compression member 2 can be metal, such as aluminum. The second compression member 3 is in direct contact with the surface of the first compression member 2 and applies elastic compression force to the first compression member 2 under the compression of the valve cover or the cylinder. The second compression member 3 may, for example, be a wave spring or a compression spring to provide elastic compression force to the first compression member 2. The elastic compression force provided by the second compression member 3 can attenuate the vibration generated by the pipeline and buffer the pressure of the medium, ensuring the sealing performance of the diaphragm 1 and helping to prolong the service life of the diaphragm 1. In addition, the second compression member 3 can have a complete ring structure; or a notch can be provided on the ring structure of the second compression member 3 to more effectively attenuate the vibration generated by the pipeline and buffer the pressure of the medium.

[0034] The diaphragm valve diaphragm fixing mechanism of the present disclosure is suitable for both manual diaphragm valves and pneumatic diaphragm valves. When the diaphragm valve diaphragm fixing mechanism is applied to a manual diaphragm valve, the second compression member 3 abuts against the valve cover of the manual diaphragm valve to install the diaphragm valve diaphragm fixing mechanism between the valve body and the valve cover. When the diaphragm valve diaphragm fixing mechanism is applied to a pneumatic diaphragm valve, the second compression member 3 abuts against the cylinder of the pneumatic diaphragm valve to install the diaphragm valve diaphragm fixing mechanism between the valve body and the cylinder.

[0035] In specific implementation, the diaphragm valve diaphragm fixing mechanism can be completely buried between the valve cover or the cylinder and the valve body by the valve cover or the cylinder, so that the diaphragm valve diaphragm fixing mechanism is not exposed, thereby improving the use stability of the diaphragm valve diaphragm fixing mechanism.

[0036] The diaphragm 1 of the diaphragm valve diaphragm fixing mechanism of the present disclosure is circular, and the diaphragm 1 is fixed by the first compression member 2 and the second compression member 3, which ensures uniform stress on the circumference of the diaphragm 1 and avoids the problem of uneven stress on the diaphragm caused by screwing the diaphragm. Moreover, the elastic compression force provided by the second compression member 3 can attenuate the vibration generated by the pipeline and buffer the pressure of the medium, ensuring the sealing performance of the diaphragm 1 and helping to prolong the service life of the diaphragm 1.

[0037] In actual application, the circular diaphragm 1 is also beneficial to improve the convenience of installation, and the installer can place the diaphragm 1 in any direction within the installation area.

[0038] In one embodiment of the diaphragm valve diaphragm fixing mechanism of the present disclosure, a ring-shaped protrusion 11 is arranged on the surface of the diaphragm 1 in the thickness direction. The ring-shaped protrusion 11 not only plays a sealing role in cooperation with the valve cover or the cylinder body, but also helps the diaphragm valve diaphragm fixing mechanism to more fully absorb the vibration generated by the pipeline, further improving the sealing performance of the diaphragm 1.

[0039] In one embodiment of the diaphragm valve diaphragm fixing mechanism of the present disclosure, a pressing fitting part 12 is arranged on the surface of the diaphragm 1 in the width direction. The pressing fitting part 12 is located at the edge of the diaphragm 1 and extends towards the second pressing part 3. The first pressing part 2 is provided with a pressing fitting surface 21 that abuts against the pressing fitting part 12. The cooperation between the pressing fitting part 12 and the pressing fitting surface 21 helps to increase the contact area between the first pressing part 2 and the diaphragm 1, so that the first pressing part 2 and the diaphragm 1 are more closely fitted together.

[0040] The pressing fitting surface 21 is usually an inclined surface, and the pressing fitting part 12 can be an inclined wedge-shaped protrusion, so as to more effectively increase the contact area between the first pressing part 2 and the diaphragm 1.

[0041] Further, the included angle between the pressing fitting surface 21 and the moving direction of the valve rod of the diaphragm valve is an acute angle. In this way, the diaphragm valve diaphragm fixing mechanism can more effectively absorb the vibration generated by the pipeline.

[0042] Further, the surface of the diaphragm 1 in the width direction is also provided with a support surface 13 and a concave part 14. The support surface 13 is located between the pressing fitting part 12 and the concave part 14, and the concave part 14 is located in the central region of the diaphragm 1. The concave part 14 extends towards the valve body of the diaphragm valve, and the connecting part for connecting the valve rod and the diaphragm 1 is arranged on the concave part 14. The support surface 13 can usually be a plane perpendicular to the moving direction of the valve rod.

[0043] The first pressing part 2 includes a lower pressing surface 22 and a lower pressing part 23. The lower pressing surface 22 is located between the lower pressing part 23 and the pressing fitting surface 21, and the lower pressing surface 22 is in close contact with the support surface 13. The lower pressing part 23 extends towards the concave part 14.

[0044] In this embodiment, the cooperation between the pressing fitting part 12 and the pressing fitting surface 21, the cooperation between the support surface 13 and the lower pressing surface 22, and the cooperation between the lower pressing part 23 and the concave part 14 realize the cooperation between the diaphragm 1 and the first pressing part 2, ensuring that the diaphragm 1 and the first pressing part 2 are stably and reliably combined, and can more fully absorb the vibration generated by the pipeline and the pressure transmitted by the buffer medium.

[0045] In an embodiment of the diaphragm valve diaphragm fixing mechanism of the present disclosure, the second pressing member 3 is a round wire wave spring. The round wire wave spring can more effectively buffer the pressure transmitted by the medium, prolonging the service life of the diaphragm 1. The round wire wave spring can also provide more accurate and repeatable elastic pressing force.

[0046] In an embodiment of the diaphragm valve diaphragm fixing mechanism of the present disclosure, the first pressing member 2 is provided with a first supporting surface 24 and a second supporting surface 25 on the surface away from the diaphragm 1, and the first supporting surface 24 and the second supporting surface 25 are not coplanar. That is, the first supporting surface 24 and the second supporting surface 25 form a stepped surface.

[0047] The diaphragm valve diaphragm fixing mechanism includes two second pressing members 3, which are respectively supported on the first supporting surface 24 and the second supporting surface 25.

[0048] The technical solution that the two second pressing members 3 respectively apply elastic pressing force to different surfaces of the first pressing member 2 is beneficial to improve the uniformity of the circumferential stress of the diaphragm 1, and makes the diaphragm valve diaphragm fixing mechanism more fully absorb the vibration generated by the pipeline and buffer the pressure transmitted by the medium.

[0049] Further, the second supporting surface 25 is higher than the first supporting surface 24, and the second supporting surface 25 is located in the inner ring of the first pressing member 2, so as to more effectively attenuate the vibration generated by the pipeline and buffer the pressure of the medium.

[0050] In order to more clearly illustrate the diaphragm valve diaphragm fixing mechanism of the present disclosure, the following will be described taking the embodiment shown in the accompanying drawings as an example: Figure 4

[0051] The diaphragm valve diaphragm fixing mechanism includes a diaphragm 1, a first pressing member 2, and two second pressing members 3.

[0052] The diaphragm 1 has a circular shape. The diaphragm 1 is provided with a ring-shaped protrusion 11 on the surface in the thickness direction, which abuts against the inner wall of the valve cover 5. The diaphragm 1 is provided with a pressing fitting part 12, a supporting surface 13, and a concave part 14 on the surface in the width direction. The pressing fitting part 12 is located at the edge of the diaphragm 1, and extends towards the second pressing member 3. The supporting surface 13 is located between the pressing fitting part 12 and the concave part 14, and the concave part 14 is located in the central region of the diaphragm 1.

[0053] ​The first pressing part 2 is provided with a pressing matching surface 21, a lower pressing surface 22 and a lower pressing part 23 on the surface corresponding to the diaphragm 1. The first pressing part 2 is made of aluminum. The pressing matching surface 21 is in abutment with the pressing matching part 12, and the included angle between the pressing matching surface 21 and the moving direction of the valve rod of the diaphragm valve is an acute angle. The lower pressing surface 22 is located between the lower pressing part 23 and the pressing matching surface 21, and the lower pressing surface 22 is in abutment with the supporting surface 13. The lower pressing part 23 extends towards the lower recess 14. The pressing matching part 12 is in abutment with the pressing matching surface 21, the supporting surface 13 is in abutment with the lower pressing surface 22, and the lower pressing part 23 is in abutment with the lower recess 14.

[0054] The surface of the first pressing part 2 opposite to the diaphragm 1 is provided with a first supporting surface 24 and a second supporting surface 25, and the first supporting surface 24 and the second supporting surface 25 form a stepped surface. The second supporting surface 25 is higher than the first supporting surface 24, and the second supporting surface 25 is located in the inner ring of the first pressing part 2.

[0055] The second pressing part 3 is a circular line wave spring. Two second pressing parts 3 are respectively supported on the first supporting surface 24 and the second supporting surface 25.

[0056] As shown in Figures 2 to 4 The diaphragm valve of the present disclosure also provides a diaphragm valve, which comprises a valve body 4, a valve cover 5 and the diaphragm valve diaphragm fixing mechanism of the present disclosure. The valve cover 5 is provided with a second pressing part cavity 51, and the second pressing part 3 is located in the second pressing part cavity 51. The second pressing part cavity 51 can provide a larger installation space for the second pressing part 3, and improve the stability of the elastic pressing force of the second pressing part 3 applied to the first pressing part 2.

[0057] It should be clear to those skilled in the art that the valve cover 5 can also be a cylinder body, and the second pressing part cavity can be provided on the cylinder body.

[0058] In specific implementation, the valve body 4 can be connected with the valve cover 5 through bolts, and the bolts used to connect the valve body 4 and the valve cover 5 have no connection relationship with the diaphragm 1, and the bolts are arranged around the diaphragm 1.

[0059] In an embodiment of the diaphragm valve of the present disclosure, the valve cover 5 is provided with a side blocking wall 52. The side blocking wall 52 is in abutment with the valve body 4, and the diaphragm 1 and the first pressing part 2 are both located on one side of the inner wall surface of the side blocking wall 52.

[0060] In this embodiment, the diaphragm 1, the first pressing part 2 and the second pressing part 3 are located in the installation space formed by the valve body 4 and the valve cover 5, and the diaphragm valve diaphragm fixing mechanism is not exposed, thereby improving the safety and stability of the diaphragm valve in use.

[0061] While certain specific embodiments of the application have been described in detail herein for the purposes of exemplification and to provide a thorough and enabling disclosure, it will be understood that the application is not limited to the particular embodiments described. Any modifications of the methods and materials described herein, which come within the scope and spirit of the application, are to be considered within the scope of the application. The scope of the application is to be determined by the claims appended hereto, which are to be construed in accordance with the principles of patent law.

Claims

1. A diaphragm fixing mechanism for a diaphragm valve, characterized in that, It includes a diaphragm, a first clamping member, and a second clamping member. The diaphragm has a circular shape. The first clamping member and the second clamping member are both disposed around the edge of the diaphragm, and the second clamping member is located on the side of the first clamping member away from the diaphragm, so as to provide an elastic clamping force to the first clamping member. The diaphragm has circumferential protrusions on its thickness direction surface; The diaphragm has a pressing fit portion on its width direction surface. The pressing fit portion is located at the edge of the diaphragm and extends toward the second pressing member. The first pressing member has a pressing fit surface that abuts against the pressing fit portion. The diaphragm is further provided with a support surface and a recessed portion on its width direction surface. The support surface is located between the pressing fit portion and the recessed portion, and the recessed portion is located in the central region of the diaphragm. The first clamping member includes a lower clamping surface and a lower clamping portion. The lower clamping surface is located between the lower clamping portion and the clamping mating surface. The lower clamping surface is in contact with the supporting surface. The lower clamping portion extends toward the recessed portion. The second clamping element is a circular wire wave spring; The first clamping member has a first support surface and a second support surface on its surface away from the diaphragm, and the first support surface and the second support surface are not coplanar; The diaphragm valve diaphragm fixing mechanism includes two second clamping members, which are respectively supported on the first support surface and the second support surface.

2. The diaphragm fixing mechanism for a diaphragm valve according to claim 1, characterized in that, The angle formed between the clamping mating surface and the moving direction of the diaphragm valve stem is an acute angle.

3. The diaphragm fixing mechanism for a diaphragm valve according to claim 1, characterized in that, The second support surface is higher than the first support surface, and the second support surface is located in the inner ring of the first clamping member.

4. A diaphragm valve, characterized in that, The device includes a valve body, a valve cover, and a diaphragm fixing mechanism for a diaphragm valve as described in any one of claims 1 to 3, wherein the valve cover is provided with a second pressing member cavity, and the second pressing member is located in the second pressing member cavity.

5. The diaphragm valve according to claim 4, characterized in that, The valve cover is provided with a side baffle wall, which abuts against the valve body. The diaphragm and the first clamping member are both located on one side of the inner wall surface of the side baffle wall.

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