CN212251288U

CN212251288U - Pneumatic diaphragm valve

Info

Publication number: CN212251288U
Application number: CN202022304989.9U
Authority: CN
Inventors: 项朴; 周小燕; 项益弟
Original assignee: Zhejiang Aodun Technology Co ltd
Current assignee: Zhejiang Aodun Technology Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2020-12-29
Anticipated expiration: 2030-10-16

Abstract

The utility model discloses a pneumatic diaphragm valve, including valve body, case and valve rod, be equipped with the pneumatic lower cover on the valve body, the pneumatic lower cover with the valve body forms a valve pocket, be equipped with pneumatic diaphragm in the valve pocket, pneumatic diaphragm with the valve body with the connection can be dismantled to the pneumatic lower cover, pneumatic lower cover fixedly connected with pneumatic upper cover, pneumatic upper cover with form a cavity between the pneumatic lower cover, be equipped with pneumatic mechanism in the cavity, be equipped with a plurality of main spring and vice spring in the cavity, the main spring with vice spring level sets up. The utility model discloses in, this structural design is simple reasonable, and the detachability is good, is convenient for install and change, is provided with EPDM diaphragm and PTFE diaphragm and adopt lid shape nut and bolt locking between valve body and pneumatic lower cover, separates the valve body inner chamber, makes the part of top not corroded by the medium, makes the device fault rate low, and operating stability is good, and the safety in utilization is higher.

Description

Pneumatic diaphragm valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a pneumatic diaphragm valve.

Background

The valve is a control part in a fluid conveying system, has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like, is used for valves of a fluid control system, has quite a plurality of varieties and specifications from the simplest stop valve to various valves used in an extremely complex automatic control system, and can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like.

The diaphragm valve is one kind of valve, and its opening and closing part is the diaphragm made of flexible material, separates valve body inner chamber and valve gap inner chamber, makes the part above the diaphragm not receive the medium corrosion, can line rubber and plastics as required in the valve body, and corrosion resistance is strong, has been widely applied to departments such as petroleum, chemical industry, electric power, medicine, environmental protection, but current diaphragm valve operation security is relatively poor, brings many inconveniences for operating personnel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to solve the problems, a pneumatic diaphragm valve is provided.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the pneumatic diaphragm valve comprises a valve body, a valve core and a valve rod, wherein a pneumatic lower cover is arranged on the valve body, the pneumatic lower cover and the valve body form a valve cavity, a pneumatic diaphragm is arranged in the valve cavity, the pneumatic diaphragm is detachably connected with the valve body and the pneumatic lower cover, a pneumatic upper cover is fixedly connected onto the pneumatic lower cover, a cavity is formed between the pneumatic upper cover and the pneumatic lower cover, and a pneumatic mechanism is arranged in the cavity.

As a further description of the above technical solution:

the cavity is internally provided with a plurality of main springs and auxiliary springs which are distributed at equal intervals along the vertical direction, and the main springs and the auxiliary springs are horizontally arranged.

As a further description of the above technical solution:

the pneumatic mechanism is provided with a pneumatic piston, the inner surface wall of the pneumatic lower cover is connected with the pneumatic piston in a sliding mode, a piston rod is fixedly connected to the outer surface wall of the top of the pneumatic piston, the outer surface wall of the piston rod is fixedly connected with a first bearing between the pneumatic upper cover, a first sealing ring is arranged between the outer surface wall of the piston rod and the pneumatic upper cover below the first bearing, and a second sealing ring is arranged between the side surface wall of the pneumatic piston and the inner surface wall of the pneumatic lower cover.

As a further description of the above technical solution:

the pneumatic top cap matched with the pneumatic top cap is embedded into the top of the pneumatic upper cap, an indicating rod is fixedly connected to the outer surface wall of the top of the piston rod, and the top end of the indicating rod penetrates through the pneumatic top cap.

As a further description of the above technical solution:

the outer surface wall of the bottom of the pneumatic piston is fixedly connected with the valve rod, the bottom end of the valve rod penetrates through the pneumatic lower cover to the valve cavity and is fixedly connected with the valve core through a square nut and a bolt, the outer surface wall of the bottom of the valve core is fixedly connected with the pneumatic diaphragm, a second bearing is fixedly connected between the side surface wall of the valve rod and the inner surface wall of the pneumatic lower cover, and a third sealing ring is arranged between the side surface wall of the valve rod above the second bearing and the inner surface wall of the pneumatic lower cover.

As a further description of the above technical solution:

the pneumatic diaphragm is formed by bonding an EPDM diaphragm and a PTFE diaphragm, the EPDM diaphragm and the PTFE diaphragm are sequentially arranged between the pneumatic lower cover and the valve body, and the pneumatic lower cover, the EPDM diaphragm, the PTFE diaphragm and the valve body are fixed through cover-shaped nuts and bolts.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model discloses in, this structural design is simple reasonable, and the detachability is good, is convenient for install and change, is provided with EPDM diaphragm and PTFE diaphragm and adopt lid shape nut and bolt locking between valve body and pneumatic lower cover, separates the valve body inner chamber, makes the part of top not corroded by the medium, makes the device fault rate low, and operating stability is good, and the safety in utilization is higher.

Drawings

Fig. 1 shows a schematic cross-sectional structural view of a pneumatic diaphragm valve provided according to an embodiment of the present invention;

fig. 2 shows a schematic diagram of an external structure of a pneumatic diaphragm valve according to an embodiment of the present invention.

Illustration of the drawings:

1. a valve body; 2. a valve core; 3. a valve stem; 4. a pneumatic lower cover; 5. a pneumatic piston; 6. a pneumatic upper cover; 7. a main spring; 8. a secondary spring; 9. a first bearing; 10. a first seal ring; 11. a pneumatic top cover; 12. an indication lever; 13. a second seal ring; 14. a square nut; 15. a second bearing; 16. a third seal ring; 17. an EPDM diaphragm; 18. a PTFE membrane; 19. a cap nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a pneumatic diaphragm valve, includes valve body 1, case 2 and valve rod 3, is equipped with pneumatic lower cover 4 on the valve body 1, and pneumatic lower cover 4 forms a valve pocket with valve body 1, is equipped with pneumatic diaphragm in the valve pocket, and pneumatic diaphragm is to the valve effect of opening and close, and pneumatic diaphragm can be dismantled with valve body 1 and pneumatic lower cover 4 and be connected, and pneumatic upper cover 6 of fixedly connected with on the pneumatic lower cover 4, forms a cavity between pneumatic upper cover 6 and the pneumatic lower cover 4, is equipped with pneumatic mechanism in the cavity.

Specifically, as shown in fig. 1 and fig. 2, a plurality of main springs 7 and auxiliary springs 8 are respectively arranged in the cavity and are distributed at equal intervals along the vertical direction, the main springs 7 and the auxiliary springs 8 are horizontally arranged, the pneumatic mechanism is provided with a pneumatic piston 5, the inner surface wall of the pneumatic lower cover 4 is in sliding connection with the pneumatic piston 5, the outer surface wall of the top of the pneumatic piston 5 is fixedly connected with a piston rod, a first bearing 9 is fixedly connected between the outer surface wall of the piston rod and the pneumatic upper cover 6, a first sealing ring 10 is arranged between the outer surface wall of the piston rod below the first bearing 9 and the pneumatic upper cover 6, a second sealing ring 13 is arranged between the side surface wall of the pneumatic piston 5 and the inner surface wall of the pneumatic lower cover 4, a pneumatic top cover 11 matched with the pneumatic top surface wall of the pneumatic upper cover 6 is embedded at the top, an indicating rod 12 is fixedly connected on the outer surface wall of the top of the piston rod, the top end of the indicating rod 12 penetrates through, the bottom end of a valve rod 3 penetrates through a pneumatic lower cover 4 to a valve cavity and is fixedly connected with a valve core 2 through a square nut 14 and a bolt, the outer surface wall of the bottom of the valve core 2 is fixedly connected with a pneumatic diaphragm, a second bearing 15 is fixedly connected between the side surface wall of the valve rod 3 and the inner surface wall of the pneumatic lower cover 4, a third sealing ring 16 is arranged between the side surface wall of the valve rod 3 above the second bearing 15 and the inner surface wall of the pneumatic lower cover 4, a first sealing ring 10, a second sealing ring 13 and the third sealing ring 16 are all made of silica gel or rubber materials, the pneumatic diaphragm is formed by bonding an EPDM diaphragm 17 and a PTFE diaphragm 18, the EPDM diaphragm 17 and the PTFE diaphragm 18 are sequentially arranged between the pneumatic lower cover 4 and a valve body 1, the pneumatic lower cover 4, the EPDM diaphragm 17, the PTFE diaphragm 18 and the valve body 1 are fixed through a cover-shaped nut 19 and a bolt, the EPDM diaphragm 17 and the PTFE diaphragm 18 are arranged between the valve body 1 and the pneumatic, the inner cavity of the valve body 1 is separated, so that parts above the valve body are not corroded by media, the failure rate of the device is low, the running stability is good, the use safety is high, and the flanges are arranged at two ends of the valve body 1 and are used for connecting external pipelines.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The pneumatic diaphragm valve comprises a valve body (1), a valve core (2) and a valve rod (3), and is characterized in that a pneumatic lower cover (4) is arranged on the valve body (1), the pneumatic lower cover (4) and the valve body (1) form a valve cavity, a pneumatic diaphragm is arranged in the valve cavity, the pneumatic diaphragm is detachably connected with the valve body (1) and the pneumatic lower cover (4), a pneumatic upper cover (6) is fixedly connected onto the pneumatic lower cover (4), a cavity is formed between the pneumatic upper cover (6) and the pneumatic lower cover (4), and a pneumatic mechanism is arranged in the cavity.

2. A pneumatic diaphragm valve according to claim 1, wherein a plurality of main springs (7) and auxiliary springs (8) are respectively arranged in the cavity at equal intervals along the vertical direction, and the main springs (7) and the auxiliary springs (8) are horizontally arranged.

3. A pneumatic diaphragm valve according to claim 1, wherein the pneumatic mechanism is provided with a pneumatic piston (5), the inner surface wall of the pneumatic lower cover (4) is slidably connected with the pneumatic piston (5), the outer surface wall of the top of the pneumatic piston (5) is fixedly connected with a piston rod, a first bearing (9) is fixedly connected between the outer surface wall of the piston rod and the pneumatic upper cover (6), a first sealing ring (10) is arranged between the outer surface wall of the piston rod below the first bearing (9) and the pneumatic upper cover (6), and a second sealing ring (13) is arranged between the side surface wall of the pneumatic piston (5) and the inner surface wall of the pneumatic lower cover (4).

4. A pneumatic diaphragm valve according to claim 3, wherein a matching pneumatic top cover (11) is embedded at the top of the pneumatic upper cover (6), an indicating rod (12) is fixedly connected to the outer surface wall of the top of the piston rod, and the top end of the indicating rod (12) penetrates through the pneumatic top cover (11).

5. The pneumatic diaphragm valve of claim 3, wherein the bottom outer surface wall of the pneumatic piston (5) is fixedly connected with the valve rod (3), the bottom end of the valve rod (3) penetrates through the pneumatic lower cover (4) to the valve cavity and is fixedly connected with the valve core (2) through a square nut (14) and a bolt, the bottom outer surface wall of the valve core (2) is fixedly connected with the pneumatic diaphragm, a second bearing (15) is fixedly connected between the side surface wall of the valve rod (3) and the inner surface wall of the pneumatic lower cover (4), and a third sealing ring (16) is arranged between the side surface wall of the valve rod (3) above the second bearing (15) and the inner surface wall of the pneumatic lower cover (4).

6. A pneumatic diaphragm valve according to claim 1, wherein said pneumatic diaphragm is formed by bonding an EPDM diaphragm (17) and a PTFE diaphragm (18), said EPDM diaphragm (17) and said PTFE diaphragm (18) being sequentially disposed between said pneumatic lower cover (4) and said valve body (1), said pneumatic lower cover (4), said EPDM diaphragm (17), said PTFE diaphragm (18) and said valve body (1) being fixed by means of a cap nut (19) and a bolt.