CN217056432U

CN217056432U - Pneumatic diaphragm valve

Info

Publication number: CN217056432U
Application number: CN202220882281.8U
Authority: CN
Inventors: 朱章辉
Original assignee: Guangdong Zhugong Valve Electromechanical Co ltd
Current assignee: Guangdong Zhugong Valve Electromechanical Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-07-26
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses a pneumatic diaphragm valve, including valve body, diaphragm spare and drive arrangement, the valve body is equipped with fluid passage, and diaphragm spare can be in the position of cutting off fluid passage and intercommunication between the position, and drive arrangement is used for driving diaphragm spare and does the motion, and drive arrangement includes casing, sealed baffle and ejector pin, and the lower extreme of ejector pin stretches out the casing and links to each other with diaphragm spare, and the ejector pin is sealed with the fitting surface of casing; the sealing partition plate is in sealing fit with the inner peripheral wall of the shell, and the inner space of the shell is hermetically divided into a sealing control cavity positioned below the sealing partition plate and a compression cavity positioned above the sealing partition plate; the oppression intracavity is equipped with the nitrogen spring, and the nitrogen spring is used for providing the variable effort of ordering about sealed baffle and driving ejector pin and descending and drive diaphragm spare and cut off fluid passage, and the casing still is equipped with the air flue that leads to outside high pressurized air source and control chamber, behind the high-pressure gas that is greater than the predetermined value of control chamber input through the air flue, can order about sealed baffle and go upward so that gas passage intercommunication.

Description

Pneumatic diaphragm valve

Technical Field

The utility model relates to a diaphragm valve field, in particular to pneumatic diaphragm valve.

Background

Pneumatic diaphragm valves are a special form of shut-off valve that has been found in the 20 th century in the 20's. 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. 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 mandril and the valve clack above the diaphragm are not corroded by the medium, the packing sealing structure is omitted, and the medium is not leaked.

The existing pneumatic diaphragm valve generally comprises a body valve body, a valve cover, a diaphragm component and a driving device, wherein a fluid channel is enclosed between the valve body and the valve cover, the diaphragm component is arranged at the fluid channel and can move under the driving of the driving device to control the connection and the disconnection of the fluid channel, so that the flow control is realized, and the existing pneumatic diaphragm valve basically meets the use requirement. However, the conventional metal spring is used as a pressing piece in the driving device, which provides a variable acting force for driving the diaphragm piece to block the fluid passage, and due to the influence of the material characteristics of the spring metal, the metal spring repeatedly expands and contracts under the action of a load for a long time in the long-term use process, so that the spring fatigue is easy to occur, the spring elasticity is reduced, and the flow control precision of the pneumatic diaphragm valve is influenced; in severe cases, the metal spring may be broken or failed, which may result in the failure of the pneumatic diaphragm valve and increase the use and maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a work stability who has pneumatic diaphragm valve aims at improving flow control precision and guarantee pneumatic diaphragm valve reduces simultaneously and uses and the maintenance cost.

In order to achieve the above object, the present invention provides a pneumatic diaphragm valve, including:

a valve body provided with a fluid passage;

a diaphragm member movable between positions blocking and communicating the fluid passage; and

the driving device is used for driving the diaphragm part to move and comprises a hollow shell, a sealing partition plate which can be arranged in the shell in a vertical sliding mode and a push rod which extends out of the sealing partition plate, the lower end of the push rod extends out of the shell and is directly connected with or abutted against the diaphragm part or a force bearing part arranged at the lower end of the push rod, and the matching surface of the push rod and the shell is sealed; the sealing partition plate is in sealing fit with the inner peripheral wall of the shell, and the inner space of the shell is hermetically divided into a sealing control cavity positioned below the sealing partition plate and a compression cavity positioned above the sealing partition plate; the oppression intracavity is equipped with nitrogen spring, nitrogen spring is used for providing and orders about sealed bulkhead and drives the ejector pin down and drive diaphragm spare and cut off the variable effort of fluid passage, and the casing still is equipped with the air flue that is used for leading to outside high pressurized air source and control chamber, behind the high-pressure gas that is greater than the predetermined value toward the control chamber input through the air flue, orders about sealed bulkhead and goes upward so that gas passage communicates.

The utility model discloses drive arrangement among the technical scheme is as oppression piece with the nitrogen spring who utilizes high-pressure nitrogen gas as working medium, and this nitrogen spring has advantages such as small, elasticity is big, the stroke is long, work is steady, it is accurate to make, long service life (can reach one million times generally flexible), elasticity curve is mild and do not need the pretension. The movement of the ejector rod can be accurately and stably controlled for a long time, so that the movement of the diaphragm component is more accurately controlled by matching with high-pressure gas, the communication and the partition of a fluid channel can be more accurately and stably controlled, the installation of the nitrogen spring in the shell is more convenient, the service life is long, and the stability and the flow control precision of the pneumatic diaphragm valve are effectively improved.

Drawings

Fig. 1 is a cross-sectional view of the present invention;

figure 2 is a schematic illustration of the nitrogen spring in the retracted state of the piston rod (with parts connected).

In the figure, 1 is a valve body, 11 is a fluid channel, 2 is a diaphragm member, 3 is a driving device, 31 is a shell, 32 is a sealing diaphragm, 33 is a mandril, 34 is a bearing member, 35 is a control chamber, 36 is a compression chamber, 4 is an air channel, 5 is a nitrogen spring, 51 is a cylinder barrel, 52 is a guide sleeve, 53 is a piston rod, 61 is a guide plate, 62 is a limit groove, 7 is a trigger part, 311 is an upper shell, 312 is a lower shell, 91 is a via hole, 92 is a positioning hole, and 93 is a pin.

Detailed Description

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

It should be noted that, if directional indicators (such as … …, upper, lower, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are involved in the embodiments of the present invention, the directional indicators are only used to explain the relative position, motion, etc. of the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 2, the pneumatic diaphragm valve comprises a valve body 1, a diaphragm member 2 and a driving device 3, wherein the valve body 1 is provided with a fluid passage 11; the diaphragm member 2 is movable between positions where the fluid passage 11 is blocked and communicated; the driving device 3 is used for driving the diaphragm member 2 to move (i.e. the driving diaphragm member 2 moves between the positions for blocking and communicating the fluid passage 11), and comprises a hollow shell 31, a sealing partition plate 32 which can be arranged in the shell 31 in a vertical sliding manner, and a push rod 33 which extends out of the sealing partition plate 32, wherein the lower end of the push rod 33 extends out of the shell 31 and is directly connected with or abutted against the diaphragm member 2 or a force bearing member 34 arranged at the lower end of the push rod 33, and the matching surface of the push rod 33 and the shell 31 is sealed; the sealing partition plate 32 is in sealing fit with the inner peripheral wall of the shell 31, and the inner space of the shell 31 is hermetically divided into a sealing control cavity 35 positioned below the sealing partition plate 32 and a pressing cavity 36 positioned above the sealing partition plate 32; the pressing cavity 36 is internally provided with a nitrogen spring 5 (or called a nitrogen cylinder or a nitrogen cylinder), the nitrogen spring 5 is used for providing a variable acting force for driving the sealing partition plate 32 to drive the ejector rod 33 to move downwards and drive the diaphragm piece 2 to separate the fluid channel 11, the shell 31 is also provided with an air channel 4 for communicating an external high-pressure air source with the control cavity 35, and after high-pressure air which is larger than a preset value is input into the control cavity 35 through the air channel 4, the sealing partition plate 32 is driven to move upwards to enable the air channels to be communicated. The utility model discloses pneumatic diaphragm valve's drive arrangement 3 is as oppression piece with nitrogen spring 5 that utilizes high-pressure nitrogen gas as working medium, and this nitrogen spring 5 has advantages such as small, elasticity is big, the stroke is long, work is steady, it is accurate to make, long service life (can reach one million times generally flexible), elasticity curve is mild and do not need the pretension. The movement of the ejector rod 33 can be accurately and stably controlled for a long time, so that the movement of the diaphragm component 2 is accurately controlled by matching with high-pressure gas, the communication and the partition of the fluid channel 11 can be accurately and stably controlled, the installation of the nitrogen spring 5 in the shell 31 is more convenient, the service life is long, and the stability and the flow control precision of the pneumatic diaphragm valve are effectively improved.

In the embodiment of the present invention, the nitrogen spring 5 includes a cylinder 51 disposed in the compression chamber 36, a guiding sleeve 52 fixedly disposed at the opening of the cylinder 51, and a piston rod 53 movably disposed in the guiding sleeve 52, the piston rod 53 is connected to the ejector rod 33 or the sealing partition plate 32, and the cylinder 51 is filled with high-pressure nitrogen. When the pressure value of the high-pressure gas which is not input into the control cavity 35 is smaller than the predetermined value, the piston rod 53 drives the ejector rod 33 downwards to eject the diaphragm member 2 to the position for blocking the fluid channel 11 under the pressure action of the high-pressure nitrogen, and after the high-pressure gas with the pressure larger than the predetermined value is input into the control cavity 35, the high-pressure gas drives the diaphragm member 2 to overcome the pressure action of the high-pressure nitrogen, drives the diaphragm member 2 upwards to move to the position for communicating the fluid channel 11, and enables the piston rod 53 to contract upwards.

In the embodiment of the present invention, the piston rod 53 and the push rod 33 may be an integrated structure, or a split structure. For split type structure, piston rod 53 directly or through the coupling piece with ejector pin 33 link firmly, preferably through bolt (like stud) or directly the shaping internal and external screw thread soon connect the cooperation etc. can dismantle the connection form and link firmly to make things convenient for the dismouting.

In the embodiment of the present invention, the coupling member is a guide plate 61, and the edge of the guide plate 61 is in sliding fit with the inner wall of the housing 31. The telescopic motion of the piston rod 53 is guided, and the piston rod 53 is prevented from generating radial deviation under the action of tangential force in the telescopic process, so that the telescopic motion precision and stability of the piston rod 53 are improved, and the service life of the piston rod is prolonged.

In the embodiment of the present invention, the housing 31 includes a lower shell 312 fixed on the top of the valve body 1 and an upper shell 311 installed on the lower shell 312. Illustratively, the lower end of the upper shell 311 is provided with an external thread (not shown), the upper end of the lower shell 312 is provided with an internal thread matching with the external thread, and the upper shell 311 and the lower shell 312 are detachably screwed and fixed through matching of the external thread and the internal thread.

The embodiment of the utility model provides an in, inferior valve 312 and epitheca 311 shaping via hole 91 and locating hole 92 respectively, when epitheca 311 and inferior valve 312 assemble in place, via hole 91 is relative with locating hole 92, has pin 93 to stretch into behind the via hole 91 card in locating hole 92 in addition, prevents that relative not hard up rotation from appearing in epitheca 311 and inferior valve 312 to can guarantee the connection stability after epitheca 311 and inferior valve 312 assemble, and improve the stability in use of diaphragm valve. In order to improve the fitting accuracy of the positioning holes 92 and the via holes 91, the via holes 91 and the positioning holes 92 may be formed by a process after the upper case 311 and the lower case 312 are assembled in place.

Specifically, the top wall of the housing 31 (i.e., the top wall of the upper cover) is provided with a limiting groove 62, the upper end of the cylinder 51 is embedded in the limiting groove 62 to position the cylinder 51, and the lower end of the piston rod 53 is directly or indirectly connected to the sealing partition plate 32.

Further, the piston rod 53 has a trigger portion 7 extending upward from the cylinder 51 and the housing 31 in sequence, the trigger portion 7 can trigger an external limit switch when moving up and down along with the piston rod 53, and a joint of the trigger portion 7 and the cylinder 51 is sealed (for example, a sealing ring is disposed at the joint) to prevent high-pressure nitrogen gas in the cylinder 51 from leaking outside. Preferably, the joint between the upper end of the trigger 7 and the housing 31 may be sealed.

In the embodiment of the present invention, a force-bearing member 34 is disposed between the diaphragm member 2 and the top rod 33, and the force-bearing member 34 is made of hard material (such as engineering plastic or metal, preferably hard plastic). At least the middle part of the diaphragm member 2 is made of an elastically deformable material (such as rubber), and when the piston rod 53 drives the force bearing member 34 to move downwards, deformation pressure can be applied to the middle part of the diaphragm member 2, so that the diaphragm member 2 is forced to deform and the fluid passage 11 is blocked, and after the piston rod 53 moves upwards, the diaphragm member 2 can elastically reset and the fluid passage 11 is communicated.

In the embodiment of the present invention, the lower end surface of the force bearing member 34 is arc-shaped, and is adapted to the shape of the fluid channel 11, so that the force of the diaphragm member 2 is more uniform.

Specifically, an air hole communicating the outside with the inside of the cylinder 51 is formed in one end, away from the opening, of the cylinder 51, and an air valve is installed in the air hole and used for filling high-pressure nitrogen with required pressure into the cylinder 51.

One or two air passages 4 can be provided, when the fluid passage 11 needs to be communicated, high-pressure gas larger than a preset value is input into the control cavity 35 through the air passages 4, and when the fluid passage 11 needs to be blocked, the high-pressure gas in the control cavity 35 can be discharged or reduced to be lower than the preset value through the air passages 4.

It can be understood that the sealing partition plate 32 is a conventional sealing partition plate, and a detailed structure thereof is not described herein, and a sealing rubber ring (not shown) is disposed at an edge of the sealing partition plate 32 to seal the gap between the sealing partition plate 32 and the inner wall of the housing, and the cross section of the sealing rubber ring may be in an O-shape or a concave shape, and when the sealing rubber ring is in a concave shape, a double-layer seal may be formed with the inner wall of the housing, so that a better sealing effect is achieved.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.

Claims

1. A pneumatic diaphragm valve, comprising:

a valve body provided with a fluid passage;

the driving device is used for driving the diaphragm part to move and comprises a hollow shell, a sealing partition plate which can be arranged in the shell in a vertical sliding mode and a push rod which extends out of the sealing partition plate, the lower end of the push rod extends out of the shell and is directly connected with or abutted against the diaphragm part or a force bearing part arranged at the lower end of the push rod, and the matching surface of the push rod and the shell is sealed; the sealing partition plate is in sealing fit with the inner peripheral wall of the shell, and the inner space of the shell is hermetically divided into a sealing control cavity positioned below the sealing partition plate and a compression cavity positioned above the sealing partition plate; the oppression intracavity is equipped with nitrogen spring, nitrogen spring is used for providing and orders about sealed bulkhead and drives the ejector pin down and drive diaphragm spare and cut off the variable effort of fluid passage, and the casing still is equipped with the air flue that is used for leading to outside high pressurized air source and control chamber, behind the high-pressure gas that is greater than the predetermined value toward the control chamber input through the air flue, can order about sealed bulkhead and go upward so that gas passage communicates.

2. The pneumatic diaphragm valve of claim 1, wherein: the top surface of the valve body is provided with a control port communicated with the fluid channel, the diaphragm piece is arranged at the control port, the shell is fixed at the top of the valve body and tightly supports the edge of the diaphragm piece to the top surface of the valve body in a sealing manner, and the control port is sealed.

3. The pneumatic diaphragm valve of claim 1, wherein: the nitrogen spring comprises a cylinder barrel arranged in the pressing cavity, a guide sleeve fixedly arranged at the opening of the cylinder barrel in an inserting mode, and a piston rod movably inserted in the guide sleeve, the piston rod is connected with the ejector rod or the sealing partition plate, and the cylinder barrel is filled with high-pressure nitrogen.

4. The pneumatic diaphragm valve of claim 3, wherein: the piston rod and the ejector rod are of an integrated structure or a split structure; when the split type structure is adopted, the piston rod is directly or fixedly connected with the ejector rod through a coupling piece.

5. The pneumatic diaphragm valve of claim 4, wherein: the coupling member is a guide plate, and the edge of the guide plate is in sliding fit with the inner wall of the shell.

6. The pneumatic diaphragm valve of claim 3, wherein: the roof of casing is equipped with the spacing groove, the upper end of cylinder is inlayed and is located in the spacing groove.

7. The pneumatic diaphragm valve of claim 3, wherein: the piston rod has a trigger part extending upwards from the cylinder barrel and the shell in sequence, and the joint of the trigger part and the cylinder barrel is sealed.

8. The pneumatic diaphragm valve of claim 3, wherein: a bearing piece is arranged between the diaphragm piece and the ejector rod, the bearing piece is made of hard materials, at least the middle part of the diaphragm piece is made of elastically deformable materials, and in the process that the piston rod drives the bearing piece to move downwards, deformation pressure can be applied to the middle part of the diaphragm piece to force the diaphragm piece to deform and block the fluid channel.

9. The pneumatic diaphragm valve of claim 8, wherein: the lower end surface of the force bearing part is arc-shaped.

10. A pneumatic diaphragm valve according to any of claims 1 to 9, wherein: the casing is including fixed the inferior valve of locating the valve body top and install in the epitheca of inferior valve, and the upper end of inferior valve is equipped with the external screw thread and the internal thread of mutually supporting respectively with the lower extreme of epitheca, and the epitheca can be dismantled with the inferior valve through external screw thread and internal thread cooperation and connect soon fixedly, and inferior valve and epitheca shaping via hole and locating hole respectively, and when epitheca and inferior valve assembly target in place, via hole and locating hole are relative, have the pin to stretch into behind the via hole card in the locating hole in addition.