Diaphragm valve sealing structure

Abstract

The utility model discloses a diaphragm valve sealing structure which comprises a valve body and a diaphragm, and at least one first protruding part is arranged at the contact position of the valve body and the diaphragm. And the tail end of the lug boss on the diaphragm is provided with at least one second lug boss. According to the sealing structure, after the valve body and the diaphragm are assembled, the outer ring protrusion (the protruding part) of the diaphragm is matched with the groove (the concave part) of the valve body, the boss (the second protruding part) of the diaphragm is in contact with the lower plane of the groove of the valve body, the plane of the diaphragm is in contact with the boss (the first protruding part) of the valve body, and two sealing ring belts are formed when the two bosses are in contact. Under the action of the same external pressure, the sealing specific pressure of the boss is far higher than the plane sealing specific pressure, and the external pressure of the boss is far lower than the external pressure required by the plane under the same sealing specific pressure, so that the conditions of valve leakage and the like caused by the reduction of the sealing specific pressure are effectively avoided, and the influence of the sealing specific pressure on the use reliability of the valve is avoided; and related risks and economic losses brought to the user are reduced.

Description

Technical Field

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

[0002] Diaphragm valve is a stop valve that uses diaphragm as opening and closing parts to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. The diaphragm is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic. The valve body is mostly made of plastic, fiberglass, ceramic or metal lining rubber materials. It has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is used for low-pressure, low-temperature, highly corrosive media and media containing suspended substances. According to the structural form, it can be divided into ridge type, stop type, gate type, etc. According to the driving mode, it can be divided into manual, pneumatic, and electric.

[0003] At present, the sealing form of diaphragm valves is generally flat sealing. Regarding flat sealing, the diaphragm and the valve body are in contact through a flat surface. When the diaphragm pressure decreases, the sealing pressure ratio between the diaphragm and the valve body will also decrease. The decrease in the sealing pressure ratio will cause the valve to leak, which will in turn affect the reliability of the valve and bring additional risks and certain economic losses to users. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a diaphragm valve sealing structure, which solves the problem of leakage risk in the diaphragm sealing structure of the diaphragm valve.

[0005] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0006] The utility model provides a diaphragm valve sealing structure, comprising a valve body and a diaphragm, wherein:

[0007] The valve body is provided with at least one first protrusion at a position where it contacts the diaphragm;

[0008] The diaphragm has at least one second protrusion at the end of the protrusion.

[0009] As a preferred technical solution of the utility model, the protrusion is arranged on the outer ring of the diaphragm.

[0010] As a preferred technical solution of the present utility model, the protrusion is installed in the recessed portion of the valve body when the diaphragm and the valve body are assembled.

[0011] As a preferred technical solution of the present utility model, the recessed portion is arranged on the valve body.

[0012] As a preferred technical solution of the present utility model, the first protrusion or the second protrusion includes a boss.

[0013] Preferably, the first protrusion has a thickness of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

[0014] Preferably, the second protrusion has a width of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

[0015] As a preferred technical solution of the utility model, when the diaphragm and the valve body are assembled,

[0016] The first protrusion abuts against the plane of the diaphragm;

[0017] The second protruding portion abuts against a plane of the recessed portion.

[0018] The beneficial effect of the utility model is that after the valve body and the diaphragm are assembled, the sealing structure of the utility model cooperates with the outer ring protrusion (protruding part) of the diaphragm and the groove (recessed part) of the valve body, the boss (second protruding part) of the diaphragm contacts the lower plane of the valve body groove, and the plane of the diaphragm contacts the boss (first protruding part) of the valve body. The contact of the two bosses forms two sealing ring belts. Under the same external pressure, the sealing pressure ratio of the boss is much higher than the sealing pressure ratio of the plane. Under the same sealing pressure ratio, the external pressure of the boss is much smaller than the external pressure required by the plane. This effectively avoids the reduction of the sealing pressure ratio which may cause leakage of the valve, avoids its influence on the reliability of the valve, and reduces the related risks and economic losses to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0021] In the figure: 100, valve body; 101, first protrusion; 102, recess; 200, diaphragm; 201, protrusion; 202, second protrusion. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] Example

[0024] like Figure 1-2As shown, this embodiment provides a diaphragm valve sealing structure, including a valve body 100 and a diaphragm 200, wherein the valve body 100 is provided with at least one first protrusion 101 at the contact point with the diaphragm 200; and the diaphragm 200 has at least one second protrusion 202 at the end of the protrusion 201 thereon.

[0025] The first protrusion 101 and the second protrusion 202 improve the reliability of the seal, and the sealing pressure ratio thereof is much higher than the existing plane seal; the outer ring protrusion (protrusion 201) of the diaphragm 200 cooperates with the groove (recess 102) of the valve body 100, the boss (second protrusion 202) of the diaphragm 200 contacts the lower plane of the groove (recess 102) of the valve body 100, and the plane of the diaphragm 200 contacts the boss (first protrusion 101) of the valve body 100. The contact of the two bosses forms two sealing ring belts. Under the same external pressure, the sealing pressure ratio of the boss is much higher than the sealing pressure ratio of the plane. Under the same sealing pressure ratio, the external pressure of the boss is much smaller than the external pressure required by the plane, which effectively avoids the reduction of the sealing pressure ratio causing leakage of the valve and avoids affecting the reliability of the use of the valve.

[0026] As shown in the data of Table 1 below, it can be seen that in the sealing pressure ratio tests of different specifications, the sealing pressure ratio of the sealing structure in this embodiment is significantly higher than the plane sealing pressure ratio.

[0027] Table 1

[0028]

[0029] The protrusion 201 is disposed on the outer ring of the diaphragm 200 . When the diaphragm 200 and the valve body 100 are assembled, the protrusion 201 is installed in the recess 102 of the valve body 100 . The recess 102 is disposed on the valve body 100 .

[0030] In this embodiment, a typical form of the first protrusion 101 or the second protrusion 202 includes a boss.

[0031] Preferably, in this embodiment, the first protrusion 101 has a width of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

[0032] The second protrusion 202 has a width of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

[0033] When the diaphragm 200 is assembled with the valve body 100 , the first protrusion 101 abuts against the plane of the diaphragm 200 ; the second protrusion 202 abuts against the plane of the recessed portion 102 .

[0034] After the valve body and the diaphragm are assembled, the sealing structure of the utility model has the outer ring protrusion (protrusion 201) of the diaphragm 200 cooperate with the groove (recess 102) of the valve body 100, the boss (second protrusion 202) of the diaphragm 200 contacts the lower plane of the groove (recess 102) of the valve body 100, and the plane of the diaphragm 200 contacts the boss (first protrusion 101) of the valve body 100. The contact of the two bosses forms two sealing ring belts. Under the same external pressure, the sealing pressure ratio of the boss is much higher than the sealing pressure ratio of the plane. Under the same sealing pressure ratio, the external pressure of the boss is much lower than the external pressure required by the plane. This effectively avoids the reduction of the sealing pressure ratio which may cause leakage of the valve, avoids affecting the reliability of the valve, and reduces the related risks and economic losses to users.

[0035] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A diaphragm valve sealing structure, characterized in that: It comprises a valve body (100) and a diaphragm (200), wherein: The valve body (100) is provided with at least one first protrusion (101) at a position where it contacts the diaphragm (200); The membrane (200) has at least one second protrusion (202) at the end of the protrusion (201) thereon.

2. A diaphragm valve sealing structure according to claim 1, characterized in that: The protruding portion (201) is arranged on the outer ring of the diaphragm (200).

3. A diaphragm valve sealing structure according to claim 1, characterized in that: The protruding portion (201) is installed in the recessed portion (102) of the valve body (100) when the diaphragm (200) and the valve body (100) are assembled.

4. A diaphragm valve sealing structure according to claim 3, characterized in that: The recessed portion (102) is arranged on the valve body (100).

5. A diaphragm valve sealing structure according to claim 1, characterized in that: The first protrusion (101) or the second protrusion (202) comprises a boss.

6. A diaphragm valve sealing structure according to claim 1, characterized in that: The first protrusion (101) has a width of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

7. A diaphragm valve sealing structure according to claim 1, characterized in that: The second protrusion (202) has a width of 0.4 mm to 0.8 mm and a height of 0.2 mm to 0.4 mm.

8. A diaphragm valve sealing structure according to claim 3 or 4, characterized in that: When the diaphragm (200) and the valve body (100) are assembled, The first protrusion (101) abuts against the plane of the diaphragm (200); The second protruding portion (202) abuts against the plane of the recessed portion (102).

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