CN210566418U

CN210566418U - Pneumatic piston diaphragm valve

Info

Publication number: CN210566418U
Application number: CN201921147541.1U
Authority: CN
Inventors: 卫洋
Original assignee: Suzhou Barnstone Environmental Protection Technology Co ltd
Current assignee: Suzhou Barnstone Environmental Protection Technology Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-05-19
Anticipated expiration: 2029-07-22

Abstract

The utility model provides a pneumatic piston diaphragm valve, including a valve body, a valve gap and a valve rod, the valve body includes into medium mouth of pipe and goes out the medium mouth of pipe, the periphery all is provided with the connecting thread section, the middle part is provided with sealed lug, the valve gap includes the end cap portion of upper end, middle piston cylinder somatic part, and the base portion of lower extreme, the center of the end cap portion is equipped with the through-hole, with the sealed axle clearance fit of valve rod upper end, the piston cylinder somatic part inside wall cooperates with the piston that the valve rod middle part set up, the base portion passes through the connecting piece fastening connection with diaphragm and valve body, the inside cover of base portion is equipped with the position sleeve, the valve rod is integrative to be provided with sealed axle, the cover axle, piston and pull rod, the cover is equipped with the pressure spring on the cover axle, this pneumatic piston diaphragm valve controls the inside gas pressure of valve gap through external controllable gas, and, is practical and convenient.

Description

Pneumatic piston diaphragm valve

Technical Field

The utility model belongs to the technical field of the valve technique and specifically relates to indicate a pneumatic piston diaphragm valve.

Background

In modern industrial production, the pipeline tightness needs to be improved for conveying gas and liquid media, but with the increase of service time, the damage of the media to valve internals is increased, and the valve needs to be maintained regularly for not influencing leakage risk, reducing production influence and the like, and the tightness of the valve body is emphatically checked. The valve body with larger safety risk is gradually replaced by modern valve products, typically a pneumatic piston type diaphragm valve, because the sealing element is a rubber diaphragm with rich elasticity. Therefore, the pneumatic diaphragm valve also has better sealing performance and minimum closing force, and separates the valve body inner cavity from the valve cover inner cavity and the driving part, so the pneumatic diaphragm valve is called. The most prominent characteristic of the pneumatic diaphragm valve is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the parts such as the valve rod, the valve clack and the like above the diaphragm are not corroded by media, a packing sealing structure is omitted, and the leakage of the media is avoided.

Disclosure of Invention

The utility model relates to a purpose is: the pneumatic piston diaphragm valve is provided and designed, the maintenance workload is small, the upgrading and the replacement are simple and convenient, and the equipment cost and the expense are low.

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

a pneumatic piston diaphragm valve comprises a valve body, a valve cover and a valve rod.

The valve body comprises a medium inlet pipe orifice and a medium outlet pipe orifice, the periphery of the valve body is provided with connecting thread sections, the middle part of the valve body is provided with a sealing lug which is matched with a diaphragm arranged at the upper part of the valve body to realize opening and closing actions,

the valve cover comprises an end cover part at the upper end, a piston cylinder body part in the middle and a base part at the lower end, a through hole is arranged in the center of the end cover part and is in clearance fit with a sealing shaft at the upper end of the valve rod, the inner side wall of the piston cylinder body part is matched with a piston arranged in the middle of the valve rod, the base part is fixedly connected with the diaphragm sheet and the valve body through connecting pieces, a positioning sleeve is sleeved in the base part, a central hole of the positioning sleeve is matched and slides with a shaft hole at the lower part of the valve rod, a thread section is arranged on the periphery of the positioning sleeve and is fixed with the thread section arranged on the base,

the valve rod is provided with a sealing shaft, a sleeve shaft, a piston and a pull rod in an integrated manner, a pressure spring is sleeved on the sleeve shaft, the pressure spring is coaxially arranged with the valve rod, and the upper end and the lower end of the pressure spring are respectively attached to the valve cover and the piston.

Furthermore, the inside of valve gap is two upper and lower space cylinder body structures, separately be provided with two gas pockets on the lateral wall of cylinder body structure, with external controllable gas pressure's trachea zonulae occludens.

Furthermore, the outer cylindrical surface of the piston is also provided with a sealing ring which is tightly attached to the inner side wall of the valve cover and can slide between the two air holes along the inner wall in an up-and-down control mode.

Furthermore, the middle part of the diaphragm is provided with an arc-shaped elastic sealing cover, and the middle part of the upper end of the sealing cover is also provided with a fixed end which is in threaded connection with a threaded section arranged at the lower end of the valve rod.

Furthermore, the periphery of the positioning sleeve is also provided with a sealing ring groove, the inner sleeve is provided with a sealing ring, and the sealing ring is tightly locked in the process of being in threaded connection with the valve cover.

Furthermore, a plurality of positioning holes are uniformly formed in the bottom end face of the positioning sleeve and are matched with positioning columns integrally formed on the upper end face of the diaphragm sheet for initial positioning.

Implement the utility model discloses a pneumatic piston diaphragm valve has following beneficial effect:

this pneumatic piston diaphragm valve passes through separately to be provided with two gas pockets on the valve gap lateral wall, realize the control to the inside gas pressure of valve gap with the trachea zonulae occludens of external controllable gas pressure, and the piston up-and-down motion at control valve rod middle part, and then stimulate diaphragm up-and-down motion, the elastic sealed lid that has that sets up at diaphragm middle part can realize the sealed lug switching action to the valve body middle part, and after valve gap or diaphragm damage, only need with it pull down the change can, need not cut off whole pipeline, change easy operation, practicality is convenient.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.

FIG. 1 is a schematic structural diagram of a pneumatic piston diaphragm valve according to the present embodiment;

the valve comprises a valve body 1, a medium inlet pipe orifice 11, a thread section 111, a medium outlet pipe orifice 12, a sealing bump 13, a valve cover 2, an end cover part 21, a piston cylinder body 22, an upper air hole 221, a lower air hole 222, a base part 23, a valve rod 3, a pull rod 31, a piston 32, a sealing shaft 33, a pressure spring 4, a sealing ring 5, a positioning block 6, a positioning sleeve 7, a positioning hole 71, a diaphragm sheet 8, a sealing cover 81, a sealing ring 9 and a bolt 10.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1, the present invention provides a pneumatic piston diaphragm valve, which includes a valve body 1, a valve cover 2 and a valve rod 3.

The valve body 1 comprises a medium inlet pipe orifice 11 and a medium outlet pipe orifice 12, the periphery of the valve body is provided with a connecting thread section 111, the middle part of the valve body is provided with a sealing lug 13, and the valve body is matched with a diaphragm 8 arranged on the upper part of the valve body 1 to realize opening and closing actions.

The valve cap 2 comprises an end cap portion 21 at the upper end, a piston cylinder portion 22 in the middle and a base portion 23 at the lower end, a through hole is formed in the center of the end cap portion 21 and is in clearance fit with a sealing shaft 33 at the upper end of the valve rod 3, the inner side wall of the piston cylinder portion 22 is matched with a piston 32 arranged in the middle of the valve rod 3, the base portion 23 is fixedly connected with the diaphragm 8 and the valve body 1 through bolts 10, a positioning sleeve 7 is sleeved inside the base portion 23, the center hole of the positioning sleeve is matched with a shaft hole in the lower portion of the valve rod 3 to slide, a thread section is arranged on the periphery of the positioning sleeve and is fixed with the thread section arranged on the base portion 23 at the lower end of the.

The valve rod 3 is integrally provided with a sealing shaft 33, a sleeve shaft, a piston 32 and a pull rod 31, a pressure spring 4 is sleeved on the sleeve shaft, the pressure spring 4 and the valve rod 3 are coaxially arranged, and the upper end and the lower end of the pressure spring are respectively attached to the valve cover 2 and the piston 32.

The further embodiment is that the interior of the valve cover 2 is an upper space cylinder structure and a lower space cylinder structure, and the side wall of the cylinder structure is separately provided with two air holes (221, 222) which are tightly connected with an external air pipe capable of controlling air pressure, so as to control the valve.

In a further embodiment, the outer cylindrical surface of the piston 32 is further provided with a sealing ring 5 which is tightly attached to the inner side wall of the valve cover 2 and can control up and down sliding along the inner wall between the two air holes (221, 222).

In a further embodiment, an arc-shaped elastic sealing cover 81 is arranged in the middle of the diaphragm 8, and a fixed end screwed with a threaded section arranged at the lower end of the valve rod 3 is further arranged in the middle of the upper end of the sealing cover 81.

The further embodiment is that the periphery of the positioning sleeve 7 is also provided with a sealing ring groove, and the inner sleeve is provided with a sealing ring 9 which is tightly locked in the process of being in threaded connection with the valve cover.

In a further embodiment, the bottom end face of the positioning sleeve 7 is further uniformly provided with 6 positioning holes 71, and the positioning holes are matched with positioning columns integrally arranged on the upper end face of the diaphragm 8 for initial positioning.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes, modifications, substitutions and alterations can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic piston diaphragm valve, includes a valve body, a valve gap and a valve rod, its characterized in that:

2. The pneumatic piston diaphragm valve of claim 1, wherein: the inside of valve gap is two upper and lower space cylinder body structures, separately be provided with two gas pockets on the lateral wall of cylinder body structure, with external controllable gas pressure's trachea zonulae occludens.

3. A pneumatic piston diaphragm valve according to claim 2, wherein: and the outer cylindrical surface of the piston is also provided with a sealing ring which is tightly attached to the inner side wall of the valve cover and can slide between the two air holes along the inner wall in an up-and-down control mode.

4. The pneumatic piston diaphragm valve of claim 1, wherein: the middle part of the diaphragm is provided with an arc-shaped elastic sealing cover, and the middle part of the upper end of the sealing cover is also provided with a fixed end which is in threaded connection with a threaded section arranged at the lower end of the valve rod.

5. The pneumatic piston diaphragm valve of claim 1, wherein: the periphery of the positioning sleeve is also provided with a sealing ring groove, the inner sleeve is provided with a sealing ring, and the sealing ring is tightly locked in the process of being in threaded connection with the valve cover.

6. The pneumatically actuated piston diaphragm valve of claim 5, wherein: the bottom end face of the locating sleeve is also evenly provided with a plurality of locating holes, and the locating holes are matched with the locating columns integrally arranged on the upper end face of the diaphragm sheet for initial locating.