Diaphragm valve body sealing structure and diaphragm valve with same

Abstract

According to the diaphragm valve body sealing structure, a valve cavity is formed in the middle of a valve body, a feeding channel and a discharging channel which are communicated with the valve cavity are formed in the two sides of the valve body respectively, and a supporting ring is arranged in the valve cavity and located between the tail end of the feeding channel and the starting end of the discharging channel. An upper arch groove of an annular structure is formed in the middle of the elastic membrane, the side edge of the elastic membrane abuts against the outer edge of the top end of the valve cavity, the upper arch groove is opposite to the supporting ring, and when the elastic membrane is pressed downwards, the upper end of the supporting ring abuts against the interior of the upper arch groove to seal the feeding channel. According to the utility model, the supporting ring can be embedded into the elastic membrane to seal the feeding channel through the accurate butt joint of the supporting ring which is oppositely arranged on the valve body and the upper arch groove in the elastic membrane, the abutting area can be expanded more easily through the nested sealing mode, and a better sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm valve devices, in particular to a diaphragm valve body sealing structure and a diaphragm valve having the same. Background Art

[0002] The diaphragm valve is an important component of pipeline transportation. It is a special form of shut-off valve. Its opening and closing parts are a diaphragm made of soft material (elastic material). The diaphragm separates the inner cavity of the valve body (fluid flow area) from the inner cavity of the valve cover and the driving components, so that the parts above the diaphragm are not corroded by the medium. The connection and isolation of a pair of flow channels in the inner cavity of the valve body are achieved by driving at least part of the diaphragm to move up and down.

[0003] In the prior art, there are many disclosures about the installation and positioning of elastic diaphragms and the sealing effect they can achieve. For example, a high-purity diaphragm valve for the semiconductor industry with application number 202222740794.8 discloses that the valve seat is set in the valve seat groove and then the valve seat is positioned and fixed by crimping. The installation process is relatively complicated, and the planar structure of the diaphragm is not conducive to forming a large-area abutment seal during the sealing process between the diaphragm and the valve seat. Utility Model Content

[0004] The purpose of the utility model is to provide a diaphragm valve body sealing structure and a diaphragm valve having the same, which can achieve the sealing of the feed channel by embedding the support ring relatively arranged on the valve body and the upper arch groove on the elastic diaphragm, and the nested sealing form can more easily expand the abutment area and has a better sealing effect.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a diaphragm valve body sealing structure, comprising:

[0006] The valve body has a valve cavity in the middle, and a feed channel and a discharge channel connected to the valve cavity are respectively provided on both sides, and a support ring is provided in the valve cavity between the end of the feed channel and the beginning of the discharge channel.

[0007] An elastic diaphragm has an upper arch groove with a ring-shaped structure in the middle, the side of the elastic diaphragm abuts against the outer edge of the top of the valve cavity, and the upper arch groove is opposite to the support ring. When the elastic diaphragm is pressed downward, the upper end of the support ring abuts against the upper arch groove to seal the feed channel.

[0008] As a further optimization, the height of the support ring is higher than the height of the valve cavity, which makes it easier to achieve sealing by abutting against the upper arch groove.

[0009] As a further optimization, the side of the elastic diaphragm is provided with a positioning folded edge, and the outer edge of the top of the valve cavity is provided with a positioning groove. The positioning folded edge is embedded in the positioning groove, which makes it easy to achieve basic positioning of the elastic diaphragm and also improve the sealing effect at the edge of the elastic diaphragm through the bending structure.

[0010] As a further optimization, the elastic diaphragm is in an upward arched structure, which can avoid the problem that a small gap between the elastic diaphragm and the support ring affects the fluid flow rate or flow rate.

[0011] As a further optimization, the diaphragm valve body sealing structure also includes a sealing ring. An installation groove is provided at the end of the feed channel and beside the support ring. The sealing ring is arranged in the installation groove and abuts against the side wall of the support ring, which can further improve the sealing effect.

[0012] As a further optimization, a lower arch groove with an annular structure is provided on the elastic diaphragm on the inner side of the upper arch groove, and a lower convex portion is formed at the lower end of the elastic diaphragm. When the elastic diaphragm is pressed downward, the lower convex portion abuts against the sealing ring. The abutment between the sealing ring and the lower convex portion can form a larger or more abutment surface to ensure the sealing effect.

[0013] As a further optimization, the upper arch groove and the lower arch groove form a continuous wave-like structure on the elastic diaphragm, and the two are adjacent to each other, combining the functions of the support ring and the upper arch groove, and the functions of the lower convex part and the sealing ring.

[0014] As a further optimization, the upper end surface of the sealing ring is a planar structure, which can improve the sealing effect by abutting against the elastic diaphragm over a larger area.

[0015] As a further optimization, the elastic diaphragm is made of stainless steel or rubber; the sealing ring is made of polytetrafluoroethylene.

[0016] The utility model also provides a diaphragm valve that can be used in the semiconductor industry, which comprises the above-mentioned diaphragm valve body sealing structure.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Through the precise docking of the relatively arranged support ring and the upper arch groove, the support ring can be embedded in the elastic diaphragm to seal the feed channel. The nested sealing form can expand the abutment area and have a better sealing effect;

[0019] 2. Compared with the elastic diaphragm with a flat structure at the upper end, the upper convex part formed by the upper arch groove can be pressed down by the external pressing mechanism more directly and stably, so that the pressing action can act more accurately on the support ring, thereby ensuring the sealing effect;

[0020] 3. The support ring can be formed in the valve body by machining, and there is no need to groove the valve body and install the valve seat separately, which can optimize the processing technology and installation process of the valve body and diaphragm valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model.

[0022] Figure 2 It is a cross-sectional view of the utility model.

[0023] Figure 3 It is a cross-sectional view of the elastic diaphragm of the utility model.

[0024] Figure 4 It is a cross-sectional view of the valve body of the utility model.

[0025] Figure 5 It is a schematic diagram of another embodiment of the elastic diaphragm of the utility model. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figures 1 to 4 As shown, the diaphragm valve body sealing structure includes a valve body 10 and an elastic diaphragm 20, the elastic diaphragm 20 is made of stainless steel, a valve cavity 100 is provided in the middle of 10, and a feed channel 110 and a discharge channel 120 connected to the valve cavity 100 are provided on both sides, the feed channel 110 includes a first feed port 111 and a first discharge port 112, the discharge channel 120 includes a second feed port 121 and a second discharge port 122, a support ring 11 is provided in the valve cavity 100 between the first discharge port 112 and the second feed port 121, and the elastic diaphragm 20 is provided with a support ring 11. An upper arch groove 211 with a ring-shaped structure is provided in the middle of the elastic diaphragm 20, so that an upper convex portion 212 is formed on the upper end surface of the elastic diaphragm 20, and the side of the elastic diaphragm 20 abuts against the outer edge of the top of the valve cavity 100 (under normal circumstances, the side of the elastic diaphragm 20 is pressed against the outer edge of the top of the valve cavity 100), and the upper arch groove 211 is opposite to the support ring 11. When the elastic diaphragm 20 is pressed downward (the external pressing mechanism acts on the upper convex portion 212 from top to bottom), the upper end of the support ring 11 abuts against the upper arch groove 211 to seal the feed channel 110.

[0028] In the utility model, the fluid enters the valve body 10 from the feed channel 110, passes through the first discharge port 112, crosses the support ring 11 and overflows into the valve cavity 100, and then is guided to the second feed port 121 through the annular valve cavity 100 and flows out of the valve body through the discharge channel 120, thus completing the fluid entering and exiting the valve body; when the valve body needs to be sealed, the external downward pressure mechanism abuts against the elastic diaphragm 20 (mainly the upper protrusion 212), squeezing the upper protrusion 212 so that the upper arch groove 211 at the lower end is nested in the support ring 11 and abuts against it, so that the fluid cannot overflow from the support ring 11, thus completing the sealing of the valve body 10.

[0029] The utility model can achieve sealing of the feed channel 110 through the precise docking of the corresponding support ring 11 arranged in the valve cavity 10 and the upper arch groove 211 formed on the elastic diaphragm 20, and the groove body of the upper arch groove 211 can have a larger contact surface when abutting against the upper end of the support ring 11, thereby improving the sealing effect; in addition, the upper protrusion 212 formed by the upper arch groove 211 can be more directly pressed down by the external pressing mechanism, so the downward pressure can act more accurately on the support ring 11, thereby ensuring the sealing effect.

[0030] Preferably, the height of the support ring 11 is higher than the height of the valve cavity 100 , which can ensure that the upper arch groove 211 first abuts against the support ring 11 when the elastic diaphragm 20 is pressed downward.

[0031] A positioning fold 201 is provided on the side of the elastic diaphragm 20, and a positioning groove 12 is provided on the outer edge of the top of the valve cavity 100. The positioning fold 201 is embedded in the positioning groove 12. On the one hand, it can ensure that the side of the elastic diaphragm 20 is pressed down accurately when the diaphragm valve is installed to avoid misalignment of the elastic diaphragm 20. On the other hand, the bending structure can better seal the edge position of the valve cavity 100.

[0032] In addition, the overall structure of the elastic diaphragm 20 is set to be an upward arched structure, which can better match the structure of the support ring 11 protruding from the valve cavity 10, and can also achieve that after the fluid enters through the feed channel 110, the elastic diaphragm 20 can be arched upward to reset it and form a larger deformation, thereby avoiding a small gap between the support ring 11 and affecting the transmission of the fluid.

[0033] like Figure 5 As shown, in another embodiment of the utility model, the diaphragm valve body sealing structure also includes a sealing ring 3 made of polytetrafluoroethylene. A mounting groove 13 is provided at the end of the feed channel 110 (the first discharge port 112) and beside the support ring 11. The sealing ring 3 is arranged in the mounting groove 13 and abuts against the side wall of the support ring 10. The sealing ring 3 can be bonded to the bottom wall of the mounting groove 13 and the inner side wall of the support ring 11. The setting of the sealing ring 3 increases the contact area with the elastic diaphragm 20, thereby ensuring the sealing effect.

[0034] Furthermore, a lower arch groove 221 with an annular structure is provided on the elastic diaphragm 20 on the inner side of the upper arch groove 211, and a lower convex portion 222 is formed at the lower end of the elastic diaphragm 20. When the elastic diaphragm 20 is pressed downward, the lower convex portion 222 abuts against the sealing ring 3. The contact area can be further increased by the abutment between the downward convex elastic diaphragm 20 and the sealing ring 3, thereby ensuring the sealing effect.

[0035] Based on the above arrangement, the upper arch groove 211 and the lower arch groove 221 preferably form a continuous wave-like structure on the elastic diaphragm 20 , which also facilitates the processing and forming of the elastic diaphragm 20 , and only requires bending or stamping the upper and lower walls of the elastic diaphragm 20 .

[0036] The upper end surface of the sealing ring 3 is a planar structure, which can achieve a relatively large area of ​​contact with the elastic diaphragm.

[0037] In addition, the utility model also provides a diaphragm valve, including the above-mentioned diaphragm valve body sealing structure, and the diaphragm valve can be used for fluid transportation in the semiconductor industry.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Diaphragm valve body sealing structure, characterized in that: include: The valve body has a valve cavity in the middle, and a feed channel and a discharge channel connected to the valve cavity are respectively provided on both sides, and a support ring is provided in the valve cavity between the end of the feed channel and the beginning of the discharge channel. An elastic diaphragm has an upper arch groove with a ring-shaped structure in the middle, the side of the elastic diaphragm abuts against the outer edge of the top of the valve cavity, and the upper arch groove is opposite to the support ring. When the elastic diaphragm is pressed downward, the upper end of the support ring abuts against the upper arch groove to seal the feed channel.

2. The diaphragm valve body sealing structure according to claim 1, characterized in that: The height of the support ring is higher than the height of the valve chamber.

3. The diaphragm valve body sealing structure according to claim 1, characterized in that: A positioning fold is provided on the side of the elastic diaphragm, a positioning groove is provided on the outer edge of the top end of the valve cavity, and the positioning fold is embedded in the positioning groove.

4. The diaphragm valve body sealing structure according to claim 1 or 3, characterized in that: The elastic membrane is in an upward arched structure.

5. The diaphragm valve body sealing structure according to claim 1, characterized in that: It also includes a sealing ring. A mounting groove is provided at the end of the feed channel and beside the support ring. The sealing ring is arranged in the mounting groove and abuts against the side wall of the support ring.

6. The diaphragm valve body sealing structure according to claim 5, characterized in that: A lower arch groove with an annular structure is provided on the elastic diaphragm at the inner side of the upper arch groove, and a lower convex portion is formed at the lower end of the elastic diaphragm. When the elastic diaphragm is pressed downward, the lower convex portion abuts against the sealing ring.

7. The diaphragm valve body sealing structure according to claim 6, characterized in that: The upper arch groove and the lower arch groove form a continuous wave-like structure on the elastic diaphragm.

8. The diaphragm valve body sealing structure according to claim 5, characterized in that: The upper end surface of the sealing ring is a planar structure.

9. The diaphragm valve body sealing structure according to claim 5, characterized in that: The elastic diaphragm is made of stainless steel or rubber; the sealing ring is made of polytetrafluoroethylene.

10. A diaphragm valve, characterized in that: The invention comprises a diaphragm valve body sealing structure as described in any one of claims 1 to 9.

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