CN216112303U

CN216112303U - Pneumatic diaphragm valve

Info

Publication number: CN216112303U
Application number: CN202122481125.9U
Authority: CN
Inventors: 叶文益
Original assignee: Xiamen Baifuda Technology Co ltd
Current assignee: Xiamen Baifuda Technology Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-03-22
Anticipated expiration: 2031-10-14

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a pneumatic diaphragm valve which comprises a valve body, a diaphragm and a driving part, wherein a medium inlet, a medium outlet, a valve port and a sealing lug are integrally formed on the valve body, the driving part comprises a valve cover and a valve cylinder, a piston and a valve rod are arranged in the valve cylinder, the periphery of the piston is in sealing sliding connection with the valve cylinder so as to divide the interior of the valve cylinder into an upper chamber and a lower chamber, the upper end of the valve cylinder is detachably connected with the valve cover, the lower end of the valve cylinder is detachably connected with an integrally formed connecting part on the valve body, the connecting part is arranged on the periphery of the valve port and is used for internally arranging the diaphragm, an upward convex positioning sleeve is integrally formed on the lower end surface of the valve cylinder, the lower end of the valve rod penetrates through the positioning sleeve in a sealing way and is detachably connected with the upper surface of the diaphragm, an upper compression spring and a lower compression spring are respectively arranged in the upper chamber and the lower chamber, two ends of the upper compression spring are respectively mounted on the inner wall of the valve cover and the upper surface of the piston, two ends of the lower compression spring are respectively and detachably arranged on the lower surface of the piston and the positioning sleeve.

Description

Pneumatic diaphragm valve

Technical Field

The utility model belongs to the technical field of valves, and particularly relates to a pneumatic diaphragm valve.

Background

The diaphragm valve is a special type of cut-off valve, its opening and closing part is a diaphragm made of soft material, and the diaphragm can separate the inner cavity of valve body from the inner cavity of valve cover and drive component, so that the parts of valve stem and valve clack positioned over the diaphragm can not be corroded by medium, and its sealing structure is not necessary, and its opening and closing can not be controlled by drive component, so that it is called diaphragm valve. The diaphragm valve can be divided into three types, namely a manual diaphragm valve, an electric diaphragm valve and a pneumatic diaphragm valve according to different driving modes of the driving part, particularly the pneumatic diaphragm valve is promoted to be more and more widely applied along with the continuous development of an air compressor in recent years, and the pneumatic diaphragm valve is opened or closed by compressed air; among them, the pneumatic diaphragm valve can be generally classified into three types of modes, a normally open mode, a normally closed mode, and a reciprocating mode.

At present, the pneumatic diaphragm valve on the market has only one of a normally open mode, a normally closed mode and a reciprocating mode, has a single function, and cannot change the mode types among the normally open mode, the normally closed mode and the reciprocating mode according to the actual process or use requirements, so that the pneumatic diaphragm valve needs to be purchased again when different types of pneumatic diaphragm valves are needed. For example, the chinese utility model discloses a publication No. CN202266695U a pneumatic diaphragm valve structure, which includes a valve body and a driving part arranged on the valve body, the valve body is integrally formed with a first runner port, a second runner port and a valve port, the driving part includes a cylinder body, a piston and a piston rod arranged in the cylinder body, the piston divides the cylinder body into an upper chamber and a lower chamber, the upper part of the cylinder body is provided with a first pneumatic control interface, the first pneumatic control interface is communicated with the upper chamber, the lower part of the cylinder body is provided with a second pneumatic control interface, and the second pneumatic control interface is communicated with the lower chamber; a compression spring is arranged between the piston and the top surface of the cylinder body, the upper end of the piston rod is fixed on the piston, the lower end of the piston rod penetrates through the bottom of the cylinder body to be connected with a diaphragm, and the diaphragm is arranged corresponding to the valve port; the pneumatic diaphragm valve with the structure is only used in a normally closed mode, and is large in maintenance difficulty due to the fact that the components are multiple and the structural connection is unreasonable, once cylinder body parts are damaged, the cylinder body parts need to be integrally replaced, meanwhile, the diaphragm sheet compresses the periphery of the diaphragm sheet at the valve port of the valve body through the cylinder body, and hidden dangers such as leakage easily occur after the diaphragm sheet runs for a long time or is aged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pneumatic diaphragm valve which is reasonable in design, simple in structure and convenient for changing the mode type and replacing parts aiming at the defects in the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a pneumatic diaphragm valve comprises a valve body, a diaphragm and a driving part arranged on the valve body, wherein a medium inlet, a medium outlet, a valve port and a sealing convex block are integrally formed on the valve body, the sealing convex block is arranged in the valve body corresponding to the valve port, the diaphragm is driven by the driving part to be matched with the sealing convex block to control the opening and closing of the valve port, the driving part comprises a valve cover and a valve cylinder, a piston and a valve rod are arranged in the valve cylinder, the piston is fixed on the valve rod, the periphery of the piston is in sealing sliding connection with the valve cylinder to divide the interior of the valve cylinder into an upper chamber and a lower chamber, the side wall of the valve cylinder is respectively communicated with an upper pneumatic control interface and a lower pneumatic control interface corresponding to the upper chamber and the lower chamber, the upper end of the valve cylinder is detachably connected with the valve cover, the lower end of the valve cylinder is detachably connected with an integrally formed connecting part on the valve body, the connecting part is arranged on the periphery of the valve port and is used for internally arranging the diaphragm, an upward convex positioning sleeve is integrally formed on the lower end surface of the valve cylinder, the lower end of the valve rod penetrates through the positioning sleeve in a sealing mode to be detachably connected with the upper surface of the diaphragm, an upper compression spring and a lower compression spring are arranged in the upper cavity and the lower cavity respectively, the two ends of the upper compression spring are detachably mounted on the inner wall of the valve cover and the upper surface of the piston respectively, and the two ends of the lower compression spring are detachably mounted on the lower surface of the piston and the positioning sleeve respectively.

In a preferred embodiment, a fixing groove is formed inside the connecting portion, and a fixing portion is connected to the periphery of the diaphragm, and the fixing portion is pressed into the fixing groove by the lower end of the valve cylinder.

As a preferred embodiment, the upper end of the positioning sleeve is provided with an upper positioning portion for positioning the axial displacement of the lower surface of the piston, and the lower end of the positioning sleeve is provided with a lower positioning portion for positioning the axial displacement of the diaphragm.

As a preferred embodiment, a guide hole for extending the upper end of the valve rod is formed in the center of the valve cover, the guide hole extends outwards to form a boss, and a protective cap is connected to the boss.

In a preferred embodiment, the valve cover is internally and integrally formed with a guide sleeve, and the guide sleeve is in sealed sliding connection with the upper end of the valve rod.

In a preferred embodiment, the piston is integrally formed in the middle of the valve stem.

As a preferred embodiment, the upper pneumatic control interface and the lower pneumatic control interface are respectively connected with two air nozzles through threads.

In a preferred embodiment, the medium inlet and the medium outlet of the valve body are respectively connected with two movable joints in a threaded manner.

In a preferred embodiment, the outer side of the bottom of the valve body corresponding to the valve port and the sealing lug is provided with a reinforcing rib structure.

In a preferred embodiment, the detachable connection is a threaded connection, a bolt-nut assembly connection or a flange connection.

By adopting the technical scheme, the utility model has the following beneficial effects:

1. through integrated into one piece connecting portion on the valve body to locate valve port week side with connecting portion, not only make things convenient for the valve body to pass through connecting portion and can dismantle with the valve jar lower extreme and be connected, can hold the diaphragm in connecting portion moreover, utilize connecting portion to play the guard action to the diaphragm, avoid the diaphragm to move for a long time or take place to reveal the hidden danger after ageing.

2. Through can dismantling the valve cylinder upper end with the valve gap and be connected, can dismantle the valve body with the valve cylinder lower extreme and be connected to and can dismantle the valve rod lower extreme and be connected with diaphragm sheet upper surface, not only make each component part can carry out local change, change easy operation, reduce cost can conveniently demolish built-in compression spring and/or compression spring down through dismantling the connection moreover.

3. The upper compression spring and the lower compression spring are respectively arranged in the upper cavity and the lower cavity, so that the pneumatic diaphragm valve can be provided with three modes of a normally open mode, a normally closed mode and a reciprocating mode by dismounting the upper compression spring and/or the lower compression spring, functions are more diversified, and development cost, labor cost, purchase cost and the like are saved.

4. The connecting part, the medium inlet, the medium outlet, the valve port and the sealing lug are integrally formed on the valve body, the positioning sleeve is integrally formed on the lower end face of the valve cylinder, the guide sleeve is integrally formed on the valve cover, and the piston is integrally formed in the middle of the valve rod, so that the assembly steps of all components of the pneumatic diaphragm valve can be simplified, and the assembly precision and the assembly efficiency are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and the following description will be made with reference to the drawings:

FIG. 1 is a schematic perspective view of a pneumatic diaphragm valve of the present invention;

FIG. 2 is a schematic front view of a pneumatic diaphragm valve of the present invention;

FIG. 3 is a schematic cross-sectional view taken along the line A-A in FIG. 2;

FIG. 4 is a schematic top view of a pneumatic diaphragm valve of the present invention;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a schematic bottom view of a pneumatically actuated diaphragm valve of the present invention;

FIG. 7 is a schematic view showing the internal structure of embodiment 2 of the pneumatic diaphragm valve of the present invention;

FIG. 8 is a schematic view showing the internal structure of embodiment 3 of the pneumatic diaphragm valve of the present invention;

fig. 9 is a schematic view of the internal structure of embodiment 4 of the pneumatic diaphragm valve of the present invention.

Detailed Description

The embodiments described below are only a part of the embodiments of the present invention, and do not represent all embodiments consistent with the present invention. Exemplary embodiments will now be described with reference to the accompanying drawings, in which:

example 1

As shown in one of fig. 1 to 9, the pneumatic diaphragm valve of the present invention includes a valve body 10, a diaphragm 20 and a driving part disposed on the valve body 10, wherein a medium inlet 11, a medium outlet 12, a valve port 13 and a sealing protrusion 14 are integrally formed on the valve body 10, the assembling steps of the parts can be simplified by the integrally formed arrangement, the assembling precision and the assembling efficiency can be improved, the sealing protrusion 14 is disposed inside the valve body 10 corresponding to the valve port 13, the diaphragm 20 is driven by the driving part to cooperate with the sealing protrusion 14 to control the opening and closing of the valve port 13, the opening and closing of the medium flowing from the medium inlet 11 to the medium outlet 12 can be controlled by the sealing protrusion 14 and the diaphragm 20, the driving part includes a valve cover 30 and a valve cylinder 40, a piston 51 and a valve rod 52 are disposed in the valve cylinder 40, the piston 51 is fixed on the valve rod 52, the periphery of the piston 51 is in sealing sliding connection with the valve cylinder 40 to divide the interior of the valve cylinder 40 into an upper chamber 43 and a lower chamber 44, in order to improve the air tightness of the upper chamber 43 and the lower chamber 44, a first sealing ring 61 may be disposed around the piston 51 for sealing, the side wall of the valve cylinder 40 is communicated with an upper pneumatic control port 41 and a lower pneumatic control port 42 corresponding to the upper chamber 43 and the lower chamber 44, respectively, and the pressure of the upper chamber 43 and the pressure of the lower chamber 44 may be controlled through the upper pneumatic control port 41 and the lower pneumatic control port 42 as required. The above-mentioned methods are conventional in the art, and are not described herein.

In order to make the pneumatic diaphragm valve more diversified in function and meet the requirements of different types of modes at different times, the present invention improves the above structure, by detachably connecting the upper end of the valve cylinder 40 with the valve cover 30, in order to improve the air tightness, a second sealing ring 62 may be provided between the upper end of the valve cylinder 40 and the valve cover 30, the lower end of the valve cylinder 40 may be detachably connected with the integrally formed connection part 15 of the valve body 10, in order to improve the air tightness, a third sealing ring 63 may be provided between the lower end of the valve cylinder 40 and the connection part 15, the lower end surface of the valve cylinder 40 may be integrally formed with an upwardly convex positioning sleeve 45, the lower end of the valve rod 52 may be detachably connected with the upper surface of the diaphragm 20 by penetrating the positioning sleeve 45 in a sealing manner, in order to improve the air tightness, a fourth sealing ring 64 may be provided between the lower end of the valve rod 52 and the positioning sleeve 45, the detachable connection may be any one of a threaded connection, a bolt-nut assembly connection and a flange connection, preferably, the detachable connection is a threaded connection, and the components are connected by adopting the detachable connection, so that the components can be locally replaced, the replacement is simpler and easier to operate, and the built-in upper compression spring and/or lower compression spring can be conveniently detached; through the connecting part 15, the valve body 10 can be conveniently detachably connected with the lower end of the valve cylinder 40 through the connecting part 15, and the connecting part 15 is arranged on the periphery of the valve port 13, so that the hidden leakage danger caused by long-time operation or aging of the diaphragm 20 can be avoided, preferably, the fixing groove 16 is arranged on the inner side of the connecting part 15, the periphery of the diaphragm 20 is connected with the fixing part 21, and the fixing part 21 is embedded in the fixing groove 16 and is pressed by the lower end of the valve cylinder 40, so that the diaphragm 20 can be accommodated in the connecting part 15, and the connecting part 15 is used for protecting the diaphragm 20; an upper compression spring 71 and a lower compression spring 72 are respectively arranged in the upper chamber 43 and the lower chamber 44, two ends of the upper compression spring 71 are respectively detachably mounted on the inner wall of the valve cover 30 and the upper surface of the piston 51, two ends of the lower compression spring 72 are respectively detachably mounted on the lower surface of the piston 51 and the positioning sleeve 45, so that the pneumatic diaphragm valve can have three modes of a normally open mode, a normally closed mode and a reciprocating mode by dismounting the upper compression spring 71 and/or the lower compression spring 72, the function of the pneumatic diaphragm valve is more diversified, and meanwhile, the development cost, the labor cost, the purchase cost and the like are saved.

In a preferred embodiment, in addition to the above structure, the upper end of the positioning sleeve 45 is provided with an upper positioning portion for positioning the axial displacement of the lower surface of the piston 51, and the lower end of the positioning sleeve 45 is provided with a lower positioning portion for positioning the axial displacement of the diaphragm 20.

In a preferred embodiment, the valve cover 30 is provided with a guide hole at the center thereof for the upper end of the valve rod 52 to extend out, and the guide hole extends outwards to form a boss, and the boss is connected with a protective cap 81.

In a preferred embodiment, in addition to the above structure, the valve cover 30 is formed with the guide sleeve 31 integrally formed inward, and the guide sleeve 31 is connected with the upper end of the valve rod 52 in a sealing and sliding manner. To improve the airtightness, a fifth packing 65 may be provided between the guide sleeve 31 and the upper end of the valve rod 52.

In a preferred embodiment, two air nozzles 82 are respectively screwed to the upper air control port 41 and the lower air control port 42 on the basis of the above structure.

In a preferred embodiment, two movable joints 83 are respectively screwed to the medium inlet 11 and the medium outlet 12 of the valve body 10.

In a preferred embodiment, in addition to the above structure, the bottom outside of the valve body 10 is provided with a rib structure 84 corresponding to the valve port 13 and the sealing protrusion 14.

In a preferred embodiment, the piston 51 is integrally formed in the middle of the valve stem 52.

In a preferred embodiment, the lower end of the valve cylinder 40 is provided with a vent hole, and the vent hole is arranged to facilitate the discharge of air between the upper surface of the diaphragm 20 and the positioning sleeve 45.

Example 2

Fig. 7 is a schematic view of the internal structure of the pneumatic diaphragm valve of the present invention in this embodiment; on the basis of the structure of the embodiment 1, when the pneumatic diaphragm valve needs to be used in a normally open mode, the valve cover 30 at the upper end of the valve cylinder 40 is firstly detached, then the upper compression spring 71 in the upper chamber 43 is detached, then the valve cover 30 is installed back to the upper end of the valve cylinder 40, and finally the upper pneumatic interface 41 and the lower pneumatic interface 42 are closed, so that the valve rod 52 drives the diaphragm sheet 20 to move upwards to open the valve port 13 under the elastic force of the lower compression spring 72, and the valve port 13 is in a normally open mode state; in this state, when the valve port 13 needs to be closed, the upper pneumatic interface 41 is opened to introduce compressed air into the upper chamber 43, so that the pressure in the upper chamber 43 is greater than the elastic force of the lower compression spring 72, and the valve rod 52 drives the diaphragm 20 to move downwards to be matched with the sealing bump 14, so as to close the valve port 13.

Example 3

Fig. 8 is a schematic view showing the internal structure of the pneumatic diaphragm valve of the present invention in this embodiment; on the basis of the structure of the embodiment 1, when the pneumatic diaphragm valve needs to be used in a normally-closed mode, the valve cover 30 at the upper end of the valve cylinder 40 is firstly detached, then the lower end of the valve rod 52 is detached from the upper surface of the diaphragm 20, then the lower compression spring 72 in the lower chamber 44 is detached, then the lower end of the valve rod 52 penetrates through the positioning sleeve 45 in a sealing manner and is installed back to the upper surface of the diaphragm 20, the valve cover 30 is installed back to the upper end of the valve cylinder 40, finally the upper pneumatic control interface 41 and the lower pneumatic control interface 42 are closed, and the valve rod 52 drives the diaphragm 20 to move downwards to be matched with the sealing lug 14 under the action of the elastic force of the upper compression spring 71 so as to close the valve port 13, so that the valve port 13 is in a normally-closed mode state; in this state, when the valve port 13 needs to be opened, the lower pneumatic interface 42 is opened to introduce compressed air into the lower chamber 44, so that the pressure in the lower chamber 44 is greater than the elastic force of the upper compression spring 71, and the valve rod 52 drives the diaphragm 20 to move upward, so as to open the valve port 13.

Example 4

Fig. 9 is a schematic view of the internal structure of the pneumatic diaphragm valve of the present invention in this embodiment; on the basis of the structure of the embodiment 1, when the pneumatic diaphragm valve needs to be used in a reciprocating mode, the valve cover 30 at the upper end of the valve cylinder 40 is firstly detached, then the lower end of the valve rod 52 is detached from the upper surface of the diaphragm 20, then the upper compression spring 71 and the lower compression spring 72 are respectively detached, then the lower end of the valve rod 52 penetrates through the positioning sleeve 45 in a sealing manner and is installed back to the upper surface of the diaphragm 20, the valve cover 30 is installed back to the upper end of the valve cylinder 40, and finally the upper pneumatic control interface 41 and the lower pneumatic control interface 42 are opened, so that the valve port 13 is in a reciprocating mode state; in this state, when the valve port 13 needs to be opened, the pressure in the lower control chamber 44 is greater than the pressure in the upper chamber 43, the valve rod 52 drives the diaphragm 20 to move upward to open the valve port 13, and when the valve port 13 needs to be closed, the pressure in the upper control chamber 43 is greater than the pressure in the lower control chamber 44, and the valve rod 52 drives the diaphragm 20 to move downward to cooperate with the sealing bump 14 to close the valve port 13.

The above are merely preferred embodiments of the present invention, and are not intended to limit the scope of the utility model; the technical solutions according to the present invention are intended to provide technical solutions for various technical solutions, which are capable of being applied to various fields of industry, such as industrial, domestic, industrial, or industrial applications.

Claims

1. The utility model provides a pneumatic diaphragm valve, includes valve body, diaphragm and locates the drive disk assembly on the valve body, integrated into one piece has medium import, medium export, valve port and sealed lug on the valve body, and sealed lug corresponds the valve port and sets up inside the valve body, and the diaphragm is driven by drive disk assembly and sealed lug cooperation in order to control opening and close of valve port, the drive disk assembly includes valve gap and valve cylinder, is equipped with piston and valve rod in the valve cylinder, and on the piston was fixed in the valve rod, piston week side and valve cylinder sealed sliding connection in order to become upper chamber and lower chamber with the valve cylinder internal partitioning, and the valve cylinder lateral wall corresponds upper chamber and lower chamber intercommunication respectively and has last pneumatic interface and lower pneumatic interface, its characterized in that: the valve comprises a valve body, a valve cover, a valve cylinder, a valve rod, a compression spring and a piston, wherein the valve rod is arranged in the valve cylinder, the upper end of the valve cylinder is detachably connected with the valve cover, the lower end of the valve cylinder is detachably connected with an integrally formed connecting part on the valve body, the connecting part is arranged on the periphery of the valve port and used for internally arranging diaphragm sheets, an upwardly convex locating sleeve is integrally formed on the lower end face of the valve cylinder, the lower end of the valve rod penetrates out of the locating sleeve in a sealing mode and is detachably connected with the upper surface of the diaphragm sheets, the upper cavity and the lower cavity are respectively internally provided with the compression spring, the two ends of the upper compression spring are respectively detachably installed on the inner wall of the valve cover and the upper surface of the piston, and the two ends of the lower compression spring are respectively detachably installed on the lower surface of the piston and the locating sleeve.

2. The pneumatic diaphragm valve of claim 1, wherein: the inner side of the connecting part is provided with a fixing groove, the periphery of the diaphragm is connected with a fixing part, and the fixing part is pressed in the fixing groove by the lower end of the valve cylinder.

3. The pneumatic diaphragm valve of claim 1, wherein: the upper end of the positioning sleeve is provided with an upper positioning part for positioning the axial displacement of the lower surface of the piston, and the lower end of the positioning sleeve is provided with a lower positioning part for positioning the axial displacement of the diaphragm.

4. The pneumatic diaphragm valve of claim 1, wherein: the valve cover is characterized in that a guide hole for extending the upper end of the valve rod is formed in the center of the valve cover, the guide hole extends outwards to form a boss, and a protective cap is connected to the boss.

5. The pneumatic diaphragm valve of claim 1, wherein: the valve cover is internally and integrally formed with a guide sleeve, and the guide sleeve is connected with the upper end of the valve rod in a sealing and sliding manner.

6. The pneumatic diaphragm valve of claim 1, wherein: the piston is integrally formed in the middle of the valve rod.

7. The pneumatic diaphragm valve of claim 1, wherein: and the upper air control interface and the lower air control interface are respectively in threaded connection with two air nozzles.

8. The pneumatic diaphragm valve of claim 1, wherein: the medium inlet and the medium outlet of the valve body are respectively in threaded connection with two movable joints.

9. The pneumatic diaphragm valve of claim 1, wherein: and reinforcing rib structures are arranged on the outer side of the bottom of the valve body corresponding to the valve port and the sealing lug.