CN211371352U

CN211371352U - Pneumatic diaphragm valve

Info

Publication number: CN211371352U
Application number: CN201922088929.5U
Authority: CN
Inventors: 李磊; 何磊
Original assignee: Wuhu Libo Machinery Technology Co ltd
Current assignee: Wuhu Libo Machinery Technology Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-08-28
Anticipated expiration: 2029-11-28

Abstract

The utility model discloses a pneumatic diaphragm valve, including last valve body, lower valve body, compressed gas and pneumatic thrust unit. Go up the valve body, set up feed liquor pipe and drain pipe down between the valve body, the end that feed liquor pipe and drain pipe were located valve body, lower valve body is buckled perpendicularly, forms the pipeline that is parallel to each other, goes up and sets up sealed diaphragm between valve body, the lower valve body, and the center of sealed diaphragm is aimed at the end of feed liquor pipe downwards, and the top of sealed diaphragm sets up pneumatic thrust unit, the utility model discloses realize the switching of valve with fairly simple structure, the business turn over liquid mouth is fast calorie of design, simple to operate, and the volume ratio is small and exquisite and no dead angle. The utility model discloses the diaphragm material is modified PTFE and many arcs shape, improves the resilience ability of diaphragm, long service life. The whole structure is acid and alkali resistant, and is particularly suitable for laboratory application of biomedicine, biochemistry and sterile food and sterile filling of modern pharmaceutical, food and cosmetic enterprises.

Description

Pneumatic diaphragm valve

Technical Field

The present invention relates to fluid shut-off valves, and more particularly, to an improved pneumatic diaphragm valve.

Background

A pneumatic diaphragm valve is a shut-off valve. The opening and closing part is a diaphragm made of soft material, and separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving part, so that the pneumatic diaphragm valve is called.

Traditional pneumatic diaphragm valve structure is as shown in fig. 1, 2, including valve body and infusion pipeline 1, sets up the protruding 2 of toper in the infusion pipeline 1, the protruding 2 top of toper sets up diaphragm 5, the diaphragm 5 top sets up holds the chamber 3, the 5 up end of diaphragm sets up push rod 4, and adjustable fender 6 is connected to 4 upper ends of push rod, adjustable fender 6 top sets up spring 7, the upper end of spring 7 supports the valve body upper end. The diaphragm 5 has certain elasticity, and the cavity 3 is provided with a gas connecting port 8.

The working process of the pneumatic diaphragm valve is as follows: when the compressed air is not introduced, the spring 7 presses the flap 6, pressing the membrane 5 via the push rod 4, so that the membrane 5 abuts on the conical projection 2, thus closing the valve body.

When compressed air is connected, the compressed air pushes the movable baffle 6 to drive the diaphragm 5, so that the diaphragm 5 is reset, the valve body is opened, and liquid circulation is realized.

The traditional pneumatic diaphragm valve is driven by compressed air, is stable in opening and closing, is generally made of PTFE materials on the contact surface of a composite membrane and liquid, and is widely applied to the industries of pharmacy, food, fine chemical engineering and the like. But the structure is complex, the service life of the diaphragm is short, and the volume is large.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects and shortcomings of the prior art, the problems of complex structure, short service life and large volume of the traditional pneumatic diaphragm valve are solved, the diaphragm combined by multiple arc surfaces is adopted, and the pneumatic diaphragm valve is designed by the applicant through multiple practical improvements.

The technical scheme is as follows: in order to achieve the above purpose, the present invention provides a pneumatic diaphragm valve, which comprises an upper valve body, a lower valve body, compressed gas and a pneumatic pushing device. The improved valve is characterized in that a liquid inlet pipe and a liquid outlet pipe are arranged between the upper valve body and the lower valve body, the ends of the liquid inlet pipe and the liquid outlet pipe in the upper valve body and the lower valve body are vertically bent to form mutually parallel pipelines, a sealing diaphragm is arranged between the upper valve body and the lower valve body, the outermost edge of the sealing diaphragm is circular, a plurality of arc surfaces are combined from outside to inside, the cross section of the sealing diaphragm is in a symmetrical wave shape, the center of the sealing diaphragm is downwards aligned to the center of the end of the liquid inlet pipe, a pneumatic pushing device is arranged above the sealing diaphragm and comprises a gas conveying device and a gas nozzle, the upper end of the gas nozzle is provided with a gas conveying device, the lower end of the gas nozzle is abutted against the center of the upper end face of the sealing diaphragm, and the upper end.

Furthermore, the sealing diaphragm is a polytetrafluoroethylene diaphragm and has the stretching/rebounding characteristic, and a gap is left between the sealing diaphragm and the end of the liquid inlet pipe when the sealing diaphragm is not pressed by compressed air in the gas nozzle.

When compressed gas is connected into the gas inlet, the gas nozzle below the gas transmission device outputs gas to press the center of the sealing diaphragm to move downwards to block the end of the liquid inlet pipe, so that the cut-off effect of the liquid inlet pipe is realized; when stopping to input compressed gas in the inlet port, the gas nozzle of the gas transmission device stops outputting gas, the sealing diaphragm leaves the end of the liquid inlet pipe because the self structure has the rebound characteristic, and the liquid inlet pipe and the liquid outlet pipe are communicated to realize liquid transmission.

Still further, the upper valve body and the lower valve body are fixedly connected through fastening bolts.

And sealing rings are arranged between the periphery of the sealing membrane and the upper valve body and between the periphery of the sealing membrane and the lower valve body.

Has the advantages that: compared with the prior art, the utility model, its beneficial effect is:

1. the utility model discloses realize the switching of valve with fairly simple structure, the valve body adopts the 316L material, and the business turn over liquid mouth is fast calorie of design, simple to operate, and the volume ratio is small and exquisite and do not have the dead angle.

2. The utility model discloses the diaphragm material is modified PTFE and many arcs shape, improves the resilience ability of diaphragm, long service life. The sealing gasket is also made of PTFE material, has acid and alkali resistance in the whole structure, and is particularly suitable for laboratory application of biomedicine, biochemistry and sterile food and sterile filling of modern pharmaceutical, food and cosmetic enterprises.

Drawings

Fig. 1 is a schematic view showing a state in which a conventional pneumatic diaphragm valve is shut off.

Fig. 2 is a schematic view showing a state in which a conventional pneumatic diaphragm valve is in flow communication.

Fig. 3 is a schematic structural diagram of a pneumatic diaphragm valve according to the present invention.

Fig. 4 is a schematic diagram of a state when the pneumatic diaphragm valve of the present invention is blocked.

Fig. 5 is a schematic view of a state of the pneumatic diaphragm valve according to the present invention during circulation.

Fig. 6 is a schematic structural diagram of the inner sealing diaphragm of the present invention.

Fig. 7 is a schematic cross-sectional view of an inner sealing diaphragm.

Detailed Description

The present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited to the examples.

As shown in fig. 1 and 2, the conventional pneumatic diaphragm valve comprises a valve body and a liquid conveying pipeline 1, wherein a conical protrusion 2 is arranged in the liquid conveying pipeline 1, a diaphragm 5 is arranged above the conical protrusion 2, a containing cavity 3 is arranged above the diaphragm 5, a push rod 4 is arranged on the upper end face of the diaphragm 5, a movable baffle 6 is connected to the upper end of the push rod 4, a spring 7 is arranged above the movable baffle 6, and the upper end of the spring 7 is abutted against the upper end of the valve body. The diaphragm 5 has certain elasticity, and the cavity 3 is provided with a gas connecting port 8.

As shown in fig. 3, 4 and 5, a pneumatic diaphragm valve comprises an upper valve body 9, a lower valve body 10, compressed gas and a pneumatic pushing device, wherein a liquid inlet pipe 15 and a liquid outlet pipe 16 are arranged between the upper valve body 9 and the lower valve body 10, the ends of the liquid inlet pipe 15 and the liquid outlet pipe 16 positioned in the upper valve body 9 and the lower valve body 10 are vertically bent to form mutually parallel pipelines, a sealing diaphragm 13 is arranged between the upper valve body 9 and the lower valve body 10, the outermost edge of the sealing diaphragm 13 is circular, is a combination of multiple arc surfaces from outside to inside, and has a cross section of a symmetrical wave shape, the center of the sealing diaphragm 13 is downwards aligned with the center of the end of the liquid inlet pipe 15, the pneumatic pushing device is arranged above the sealing diaphragm 13 and comprises a gas conveying device 12 and a gas nozzle 17, the upper end of the gas nozzle 17 is provided with the gas conveying device 12, the lower end of the gas nozzle 17 is sealed against the center of the upper end surface of the gas, the upper end of the gas transmission device 12 is provided with a gas inlet 11.

The sealing membrane 13 is a polytetrafluoroethylene membrane and has the stretching/rebounding characteristic, when the sealing membrane 13 is not pressed by the compressed air of the gas nozzle 17, a gap is left between the sealing membrane and the end head of the liquid inlet pipe 15,

compressed gas is connected into the gas inlet port 11, and when the gas nozzle 17 below the gas transmission device 12 outputs gas, the center of the sealing diaphragm 13 is pressed to move downwards, the end of the liquid inlet pipe 15 is blocked, and the effect of breaking the flow of the liquid inlet pipe 15 is realized; when the compressed gas stops being input into the gas inlet port 11, the gas nozzle 17 of the gas transmission device 12 stops outputting the gas, the sealing diaphragm 13 is separated from the end of the liquid inlet pipe 15 due to the rebound characteristic of the self structure, and the liquid inlet pipe 15 is communicated with the liquid outlet pipe 16, so that the liquid transmission is realized.

The upper valve body 9 and the lower valve body 10 are connected and fixed through fastening bolts 14.

And sealing rings are arranged between the periphery of the sealing diaphragm 13 and the upper valve body 9 and the lower valve body 10.

As shown in fig. 6 and 7, the outermost edge of the sealing membrane 13 is circular, and has a combination of multiple arc surfaces from outside to inside, and the cross section of the sealing membrane is in a symmetrical wave shape.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a pneumatic diaphragm valve, includes upper valve body (9), lower valve body (10), compressed gas and pneumatic thrust unit, its characterized in that: the gas injection valve is characterized in that a liquid inlet pipe (15) and a liquid outlet pipe (16) are arranged between the upper valve body (9) and the lower valve body (10), the ends of the liquid inlet pipe (15) and the liquid outlet pipe (16) positioned in the upper valve body (9) and the lower valve body (10) are vertically bent to form mutually parallel pipelines, a sealing diaphragm (13) is arranged between the upper valve body (9) and the lower valve body (10), the outermost edge of the sealing diaphragm (13) is circular, the sealing diaphragm (13) is combined by multiple arc surfaces from outside to inside, the cross section of the sealing diaphragm (13) is in a symmetrical wave shape, the center of the sealing diaphragm (13) is downwards aligned to the center of the end of the liquid inlet pipe (15), a pneumatic pushing device is arranged above the sealing diaphragm (13) and comprises a gas conveying device (12) and a gas nozzle (17), the upper end of the gas nozzle (17) is provided with the gas conveying device (12), and the center of the upper end surface of the sealing diaphragm (, the upper end of the gas transmission device (12) is provided with a gas inlet port (11),

the sealing membrane (13) is a polytetrafluoroethylene membrane and has the stretching/rebounding characteristic, when the sealing membrane (13) is not pressed by compressed air in the gas nozzle (17), a gap is left between the sealing membrane and the end of the liquid inlet pipe (15),

when compressed gas is connected into the gas inlet (11), the gas nozzle (17) below the gas transmission device (12) outputs gas, the center of the sealing diaphragm (13) is pressed to move downwards, the end of the liquid inlet pipe (15) is blocked, and the effect of cutting off the liquid inlet pipe (15) is achieved; when the compressed gas stops being input into the gas inlet port (11), the gas nozzle (17) of the gas transmission device (12) stops outputting the gas, the sealing diaphragm (13) has the rebound characteristic due to the self structure, the sealing diaphragm leaves the end of the liquid inlet pipe (15), and the liquid inlet pipe (15) is communicated with the liquid outlet pipe (16) to realize liquid transmission.

2. A pneumatic diaphragm valve according to claim 1, wherein: the upper valve body (9) and the lower valve body (10) are fixedly connected through fastening bolts (14).

3. A pneumatic diaphragm valve according to claim 1, wherein: and a sealing ring is arranged between the periphery of the sealing membrane (13) and the upper valve body (9) and the lower valve body (10).