CN102705530A

CN102705530A - Membrane type pneumatic membrane valve

Info

Publication number: CN102705530A
Application number: CN2012102059829A
Authority: CN
Inventors: 李水波; 姚兴珍
Original assignee: KUNSHAN XINLAI CLEAN APPLIED MATERIALS CO Ltd
Current assignee: KUNSHAN XINLAI CLEAN APPLIED MATERIALS CO Ltd
Priority date: 2012-06-21
Filing date: 2012-06-21
Publication date: 2012-10-03

Abstract

The invention discloses a membrane type pneumatic membrane valve, which includes a valve body, a lower cover and an upper cover, wherein the lower cover is mounted at the top of the valve body, the upper cover is mounted at the top of the lower cover, a valve rod is mounted in the valve body, the bottom end of the valve rod is connected with a valve core, and the valve core is connected with a membrane. The membrane type pneumatic membrane valve is characterized in that a pneumatic head membrane is arranged between the lower cover and the upper cover, a lower seal space is surrounded by the pneumatic head membrane and the lower cover, an upper seal space is surrounded by the pneumatic head membrane and the upper cover, an air inlet is formed in the lower cover, an exhaust hole is formed in the upper cover, the top end of the valve rod extends upwards and penetrates through the pneumatic head membrane to the upper seal space, the pneumatic head membrane can drive the valve rod to move up and down to open or close the valve, and a spring in a compression state is mounted between the pneumatic head membrane and the top wall of the upper cover. The membrane type pneumatic membrane valve is convenient to mount and does not pollute a sterile environment.

Description

The diaphragm type pneumatic diaphragm valve

Technical field

The present invention relates to a kind of membrane valve, relate in particular to a kind of diaphragm type pneumatic diaphragm valve.

Background technique

Pneumatic diaphragm valve is a kind of more common automatic control membrane valve; It mainly includes valve body and valve rod, and valve rod is installed on the inside of valve body, and the bottom of valve rod is equipped with spool; Be connected with the diaphragm of control valve On/Off on the spool; The top of valve rod is equipped with pneumatic head, and the working principle of this pneumatic diaphragm valve is: control pneumatic head through the switching of gas circuit and move, move up and down thereby drive valve rod; Valve rod transport to up and down that the diaphragm that drives spool and be connected with spool moves up and down and the purpose that plays the On/Off valve; Because this pneumatic diaphragm valve is easy to operate, is widely used in food, pharmaceutical industry, has extraordinary application prospect.Yet this pneumatic diaphragm valve still has deficiency; For example: the pneumatic head as driving element is generally the piston type design; And this piston type design causes the installation and removal of pneumatic head relatively more difficult; Piston is when moving up and down in addition, and the oil stain on valve rod and the piston can be discharged from exhaust port along with gas together, pollutes aseptic environments.

In sum, pneumatic diaphragm valve in the market also exists the installation and removal of pneumatic head relatively more difficult, and the oil stain on valve rod and the piston can be discharged from exhaust port along with gas together, thereby pollutes the defective and the problem of gnotobasis.

Summary of the invention

Technical problem to be solved by this invention provides a kind of easy for installation, diaphragm type pneumatic diaphragm valve that can not pollute gnotobasis.

For solving the problems of the technologies described above, the technological scheme that the present invention adopted is: a kind of diaphragm type pneumatic diaphragm valve comprises valve body, lower cover and loam cake; Said lower cover is installed in the top of said valve body, and said loam cake is installed in the top of said lower cover, in the said valve body valve rod is installed; The bottom of said valve rod is connected with spool; Said spool is connected with diaphragm, is provided with pneumatic diaphragm between said lower cover and the said loam cake, and said pneumatic diaphragm and said lower cover are surrounded by the lower seal space; Said pneumatic diaphragm and said loam cake are surrounded by seal space; Said covering down offers the inlet hole that communicates with said lower seal space, covers on said to offer with said to go up the exhaust port that seal space communicates, and the top of said valve rod extends up through said pneumatic diaphragm and goes up in the seal space to said; Said pneumatic diaphragm can drive said valve rod and move up and down and open or throttle down, and the spring that is in compressive state is installed between the roof of said pneumatic diaphragm and said loam cake.

The upper and lower surfaces of said pneumatic diaphragm is separately installed with the diaphragm gland.

The top of said valve rod is equipped with pointer.

Said spring is a helical spring.

Between said lower cover and the said valve body bearing is installed.

Compared with prior art, beneficial effect of the present invention is:

1. because a kind of diaphragm type pneumatic diaphragm valve of the present invention is provided with pneumatic diaphragm between lower cover and loam cake; During use, ventilate in the lower seal space that the gentle moving diaphragm of lower cover surrounds through inlet hole, under the effect of air pressure; Pneumatic diaphragm produces convexity upwards; Pneumatic diaphragm drives valve rod and moves upward when generation raises up, make valve open, and pneumatic diaphragm is isolated in the oil stain of valve rod cooperation place in the seal space of pneumatic diaphragm below all the time in the whole process; Thereby can not take place oil stain to reveal and the phenomenon of pollution gnotobasis, so the present invention can not pollute gnotobasis.

2. because a kind of diaphragm type pneumatic diaphragm valve of the present invention adopts bolt to be connected loam cake and lower cover, this kind Placement is safer than the mode that covers in the existing technology is threaded, convenient, so the present invention is easy for installation.

Description of drawings

Specify the present invention below in conjunction with accompanying drawing and mode of execution:

Fig. 1 is a structural representation of the present invention.

Among the figure: valve body 10, bearing 12, lower cover 16, loam cake 18 advances medium channel 20, goes out medium channel 22; Diaphragm 24, pneumatic diaphragm 26, last seal space 27, lower seal space 29, inlet hole 30, exhaust port 32; Valve rod 34, spool 36, spring 38, diaphragm gland 40, pointer 42.

Embodiment

As shown in Figure 1; A kind of diaphragm type pneumatic diaphragm valve of the present invention comprises valve body 10, bearing 11, lower cover 16 and loam cake 18, has into medium channel 20 on the valve body 10 and goes out medium channel 22; With the intersection that goes out medium channel 22 diaphragm 24 is installed advancing medium channel 20; But these diaphragm 24 deformation make into that medium channel 20 communicates with going out medium channel 22, also can intercept into medium channel 20 and go out medium channel 24, thereby realize the unlatching of valve or close.

The top of bearing 12 is equipped with lower cover 16 through bolt; The top of lower cover 16 is equipped with loam cake 18 through bolt; A sealed space is formed in the inside of loam cake 18 and lower cover 16, and pneumatic diaphragm 26 is installed between loam cake 18 and the lower cover 16, and the seal space that this pneumatic diaphragm 26 formed loam cake 18 and lower cover 16 is divided into the last seal space 27 that surrounded by loam cake 18 and pneumatic diaphragm 26 and by lower cover 16 and pneumatic the lower seal space 29 that diaphragm 26 surrounds; On lower cover 16, offer inlet hole 30; This inlet hole 30 communicates with lower seal space 29, on loam cake 18, offers exhaust port 32, and this exhaust port 32 communicates with last seal space 27.

Valve rod 34 is installed in the bearing 12, and the bottom of this valve rod 34 is connected with spool 36 through bolt, and spool 36 is fixedly connected with the diaphragm 24 of its below; The top of valve rod 34 extends upward in the bottom of passing lower cover 16 successively and pneumatic the diaphragm 26 supreme seal space 27, and pneumatic diaphragm 26 can drive valve rod 34 motions when producing deformation under external force.

Between the roof of the upper surface of pneumatic diaphragm 26 and loam cake 18 inside spring 38 is installed; This spring 38 is in compressive state when valve closing; Preferably the upper and lower surfaces at pneumatic diaphragm 26 is equipped with diaphragm gland 40; The size of this diaphragm gland 40 can not hinder pneumatic diaphragm 26 under compressing, to produce convexity upwards; Preferably also be connected with a pointer 42 on the top of valve rod 34, this pointer 42 is arranged in seal space 27, and the length of this pointer can not hinder valve rod 34 to move up and open valve simultaneously.

The working principle of diaphragm type pneumatic diaphragm valve of the present invention is: when inlet hole 30 ventilations; Just can inflate in the lower seal space 29 that pneumatic diaphragm 26 and lower cover 16 are formed; Its internal air pressure can increase along with the ventilation of inlet hole 30; Because the effect of air pressure can force pneumatic diaphragm 26 to raise up, pneumatic diaphragm 26 generations can drive valve rod 34 and move straight up when raising up, move upward with diaphragm 24 thereby drive spool 36 successively; Make into medium channel 20 and go out medium channel 22 and communicate, thereby realize the unlatching of valve; Opposite, when inlet hole 30 stopped to ventilate, pneumatic diaphragm 26 can restPose under the effect of spring 38, even diaphragm 24 intercepts medium channel 20 and goes out medium channel 22, thereby realized closing of valve.

In sum, the present invention is not only easy for installation, and can not pollute aseptic environments.

The above is merely preferred embodiments of the present invention; Protection scope of the present invention is not exceeded with above-mentioned mode of execution; As long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection domain of putting down in writing in claims.

Claims

1. diaphragm type pneumatic diaphragm valve; Comprise valve body (10), lower cover (16) and loam cake (18); Said lower cover (16) is installed in the top of said valve body (10); Said loam cake (18) is installed in the top of said lower cover (16); Valve rod (34) is installed in the said valve body (10), and the bottom of said valve rod (34) is connected with spool (36), and said spool (36) is connected with diaphragm (24); It is characterized in that: be provided with pneumatic diaphragm (26) between said lower cover (16) and the said loam cake (18); Said pneumatic diaphragm (26) is surrounded by lower seal space (29) with said lower cover (16), and said pneumatic diaphragm (26) is surrounded by seal space (27) with said loam cake (18), offers the inlet hole (30) that communicates with said lower seal space (29) on the said lower cover (16); Offer the exhaust port (32) that communicates with said upward seal space (27) on the said loam cake (18); The top of said valve rod (34) extends up through said pneumatic diaphragm (26) and goes up in the seal space (27) to said, and said pneumatic diaphragm (26) can drive said valve rod (34) and move up and down and open or throttle down, and the spring (38) that is in compressive state is installed between the roof of said pneumatic diaphragm (26) and said loam cake (18).

2. diaphragm type pneumatic diaphragm valve according to claim 1 is characterized in that: the upper and lower surfaces of said pneumatic diaphragm (26) is separately installed with diaphragm gland (40).

3. diaphragm type pneumatic diaphragm valve according to claim 1 and 2 is characterized in that: the top of said valve rod (34) is equipped with pointer (42).

4. diaphragm type pneumatic diaphragm valve according to claim 3 is characterized in that: said spring (38) is a helical spring.

5. diaphragm type pneumatic diaphragm valve according to claim 4 is characterized in that: between said lower cover (16) and the said valve body (10) bearing (12) is installed.