CN215928478U

CN215928478U - Pneumatic diaphragm valve

Info

Publication number: CN215928478U
Application number: CN202122531985.9U
Authority: CN
Inventors: 项朴
Original assignee: Wenzhou Jianuo Fluid Technology Co ltd
Current assignee: Jianuo Fluid Control Zhejiang Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-03-01
Anticipated expiration: 2031-10-19

Abstract

The utility model discloses a pneumatic diaphragm valve which comprises a valve body, a valve cover arranged on the valve body, a valve rod arranged on the valve cover, a diaphragm arranged between the valve cover and the valve body, and a pneumatic actuator for driving the valve rod to move, wherein a first connecting piece is fixedly arranged on the diaphragm, a butt joint assembly is arranged between the first connecting piece and the valve rod, a butt joint block surrounding the first connecting piece is arranged on the diaphragm, a valve core is arranged between the valve rod and the butt joint block, the valve core and the butt joint block are limited and fixed by the valve rod and the diaphragm, a second connecting piece is fixedly arranged on the diaphragm, and the second connecting piece is matched with the valve core and the butt joint block to realize linkage with the valve rod. The utility model has the following advantages and effects: the utility model has higher structural strength and longer service life.

Description

Pneumatic diaphragm valve

Technical Field

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

Background

The diaphragm valve is a stop valve which uses a diaphragm as an opening and closing piece to close a flow passage, cut off fluid and separate an inner cavity of a valve body from an inner cavity of a valve cover. The diaphragm is made of elastic, corrosion-resistant and impermeable materials such as rubber and plastics. The valve body is made of multipurpose plastic, glass fiber reinforced plastic, ceramic or metal lining rubber material. Simple structure, better sealing and corrosion resistance and small fluid resistance. The medium is used for low pressure, low temperature, medium with strong corrosiveness and suspended substance.

The diaphragm valve is structurally characterized in that a valve rod is connected with a diaphragm, and acting force is applied to the diaphragm through the valve rod to enable the diaphragm to deform so as to match with a valve body to realize opening and closing. This kind of mode needs the valve rod to exert great drive power to the diaphragm and just can make the diaphragm take place to deform, will lead to the hookup location between valve rod and the diaphragm to receive great concentrated effort like this, and the intensity of junction is comparatively weak between current valve rod and the diaphragm in addition, and in the long past, hookup location between valve rod and the diaphragm is very easily cracked to influence the life of diaphragm valve.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pneumatic diaphragm valve, which improves the structural strength of connection between a valve rod and a diaphragm, thereby prolonging the service life of the pneumatic diaphragm valve.

The technical purpose of the utility model is realized by the following technical scheme: the utility model provides a pneumatic diaphragm valve, includes the valve body, sets up in the valve gap of valve body, installs in the valve rod of valve gap, sets up the diaphragm between valve gap and valve body and drives the pneumatic actuator of valve rod motion, the fixed first connecting piece that is provided with on the diaphragm, be equipped with the butt joint subassembly between first connecting piece and the valve rod, be provided with on the diaphragm around the butt joint piece in first connecting piece, be equipped with the case between valve rod and the butt joint piece, case and butt joint piece are by valve rod and diaphragm both spacing fixed, the fixed second connecting piece that is provided with on the diaphragm, the linkage with the valve rod is realized with the butt joint piece to second connecting piece cooperation case.

By adopting the technical scheme, the first connecting piece is matched with the butt joint assembly to realize the fixed connection between the valve rod and the diaphragm, so that the valve rod can drive the diaphragm to act through the first connecting piece; the valve core and the butt joint block are limited and fixed while being fixedly connected, and the valve rod and the diaphragm are fixedly connected by matching with the second connecting piece, so that the valve rod can drive the diaphragm to act through the second connecting piece. The first connecting piece is matched with the second connecting piece to increase the connecting area between the first connecting piece and the diaphragm so as to realize sharing stress, so that the phenomenon of stress concentration is avoided, the structural strength of connection between the valve rod and the diaphragm is improved, the occurrence of fracture is prevented, and the service life of the pneumatic diaphragm valve is prolonged.

Further setting the following steps: the second connecting piece is provided with a plurality of in surrounding around butt joint piece, and adjacent the interval sets up between the butt joint piece, the second connecting piece is elastic material.

Through adopting above-mentioned technical scheme, the elastic deformation that elastic material's second connecting piece possessed is in the deformation clearance that forms between the adjacent butt joint piece of cooperation, supplies the butt joint piece to realize the installation. The connecting area between the diaphragm is further increased through the arrangement of the second connecting pieces, the structural strength of connection between the diaphragm and the valve rod is improved, and therefore the service life of the pneumatic diaphragm valve is further prolonged.

Further setting the following steps: the second connecting piece comprises a connecting section and a limiting section, wherein the connecting section is integrally connected with the diaphragm, and the limiting section is integrally connected with the connecting section and is clamped and fixed by the valve core and the butt joint block.

Through adopting above-mentioned technical scheme, spacing section is located case and butt joint piece between the two and by these two centre gripping fixed for the valve rod can drive the diaphragm action through the second connecting piece in the in-process of motion, with this to realize that diaphragm and valve rod between the two are connected in a coordinated manner.

Further setting the following steps: the butt joint component comprises an insertion hole formed in the valve rod and used for the first connecting piece to be inserted into, and a spiral line formed in the insertion hole and in threaded connection with the first connecting piece.

Through adopting above-mentioned technical scheme, first connecting piece inserts the jack and realizes the fixed butt joint of first connecting piece and valve rod through constituting screw-thread fit with the spiral line, makes valve rod and diaphragm both can constitute the linkage to this realizes that the valve rod drives the diaphragm and moves.

Further setting the following steps: be equipped with annular sealing member of circle between valve rod and the valve gap, the periphery wall of sealing member is equipped with annular sealed arch of circle, it is equipped with the seal groove of adaptation with it to correspond sealed bellied position on the valve gap, sealed protruding outer peripheral face is extended towards pneumatic actuator direction and outwards is the flaring setting gradually and forms a guide inclined plane, guide inclined plane one side that pneumatic actuator was dorsad is connected with the periphery wall of sealing member, sealed protruding spacing face of the sealed protruding motion of orientation pneumatic actuator of one side formation restriction of pneumatic actuator motion.

Through adopting above-mentioned technical scheme, the in-process between valve rod and the valve gap is gone into in the installation of sealing member, and the guide inclined plane of formation plays the guide effect to the sealed arch that exists, avoids the sealed arch that sets up to constitute great interference, makes the installation operation more convenient. The contact area between the sealing element and the valve cover is increased by matching the sealing element with the sealing bulge, so that a better sealing effect is achieved. The sealing element is prevented from being separated from the mounting position by the arrangement of the limiting surface, and the durable and stable sealing installation of the sealing element is ensured.

Further setting the following steps: pneumatic actuating mechanism sets up piston and the main spring of drive piston motion in the lid including installing in the lid of valve gap, sliding, the valve rod extends and covers internal and be connected with the piston, the position that the valve rod is located the lid inside is equipped with the switch indicator pole, the lid is equipped with the observation hole corresponding to the position of switch indicator pole, be equipped with the plastics glass lid on the observation hole.

Through adopting above-mentioned technical scheme, the setting up of plastic glass lid prevents inside entering lid of particle impurity, rainwater etc. that pneumatic actuator's life is guaranteed. The staff can be clear through the position of observing the hole observation switch indicator lever and know the state of locating of valve to the convenience is judged the operating condition of valve.

Further setting the following steps: the switch indicating rod moves towards the observation hole in a reciprocating mode under the driving of the valve rod, the switch indicating rod is connected with the valve rod in a threaded mode and used for adjusting the distance between the switch indicating rod and the observation hole, and the plastic glass cover is connected with the cover body in a threaded mode.

Through adopting above-mentioned technical scheme, set the mode that the switch indication pole moved towards the observation hole to make the position of switch indication pole can form bigger visual contrast to realize clearer observation, play better indicative function. The position of the switch indicating rod is adjusted by arranging the switch indicating rod to be in threaded connection with the valve rod, and the mode can compensate for the fit tolerance formed by assembly, so that better practicability is achieved.

Further setting the following steps: the diaphragm comprises a diaphragm sheet and a pad diaphragm fixedly arranged on the diaphragm sheet, wherein the diaphragm sheet is a PTFE diaphragm, and the pad diaphragm is an EPDM diaphragm.

Through adopting above-mentioned technical scheme, PTFE diaphragm cooperation EPDM diaphragm makes the diaphragm have leakproofness and life concurrently.

Further setting the following steps: the outer wall of the cover body is formed with an outward convex annular bulge around the observation hole, the plastic glass cover is provided with an annular blocking edge extending towards the annular bulge, and the annular blocking edge is located on an outer ring of the annular bulge.

Through adopting above-mentioned technical scheme, the annular is kept off and is realized the overlap along cooperation annular bulge for between rainwater and the difficult entering plastics glass lid of dust granule and the observation hole, guarantee pneumatic actuator's life with this.

In conclusion, the utility model has the following beneficial effects: the utility model has higher structural strength and longer service life.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is an enlarged view of the portion C in fig. 1.

In the figure: 1. a valve body; 2. a valve cover; 3. a valve stem; 4. a diaphragm; 41. a diaphragm sheet; 42. a gasket sheet; 5. a pneumatic actuator; 51. a cover body; 52. a piston; 53. a main spring; 6. a first connecting member; 7. a docking assembly; 71. a jack; 72. a helical pattern; 8. a butt joint block; 9. a valve core; 10. a second connecting member; 101. a connecting section; 102. a limiting section; 11. a seal member; 12. sealing the protrusion; 13. a sealing groove; 14. a guide ramp; 15. a limiting surface; 16. a switch indication lever; 17. an observation hole; 18. a plastic glass cover; 19. an annular projection; 20. and an annular blocking edge.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 4, the pneumatic diaphragm valve includes a valve body 1, a bonnet 2 fixedly disposed on the valve body 1, a valve rod 3 mounted on the bonnet 2, a diaphragm 4 disposed between the bonnet 2 and the valve body 1 and clamped and fixed by the bonnet 2 and the valve body 1, and a pneumatic actuator 5 mounted above the bonnet 2 for driving the valve rod 3 to move. The diaphragm 4 includes a diaphragm 41 and a cushion diaphragm 42 fixedly disposed above the diaphragm 41, the diaphragm 41 is a PTFE diaphragm, and the cushion diaphragm 42 is an EPDM diaphragm. The gasket film 42 is fixedly provided with a first connecting piece 6, a butt joint assembly 7 is arranged between the first connecting piece 6 and the valve rod 3, a butt joint block 8 surrounding the first connecting piece 6 is arranged above the gasket film 42, and the butt joint block 8 is in a ring shape. A valve core 9 is arranged between the valve rod 3 and the butt joint block 8, a second connecting piece 10 is fixedly arranged on the gasket film 42, and the second connecting piece 10 is matched with the valve core 9 and the butt joint block 8 to realize linkage with the valve rod 3.

The second connecting piece 10 is provided with a plurality ofly around encircleing around butt joint piece 8, and the interval sets up between the adjacent butt joint piece 8, and second connecting piece 10 is elastic material, specifically is rubber. The docking assembly 7 includes an insertion hole 71 formed in the valve rod 3 and into which the first connector 6 is inserted, and a spiral thread 72 formed on a wall of the insertion hole 71 and threadedly connected with the first connector 6. The first connecting piece 6 drives the gasket 42 to match with the valve rod 3 to clamp and fix the valve core 9 and the butt joint block 8 in the process of threaded connection. The second connecting member 10 includes a connecting section 101 integrally connected to the pad membrane 42, and a limiting section 102 integrally connected to the connecting section 101 and clamped and fixed by both the valve element 9 and the abutting block 8.

An annular sealing element 11 is arranged between the valve rod 3 and the valve cover 2, an annular sealing bulge 12 is integrally arranged on the peripheral wall of the sealing element 11, and a sealing groove 13 matched with the sealing bulge 12 is formed in the position, corresponding to the sealing bulge 12, on the valve cover 2. The peripheral surface of the sealing bulge 12 extends towards the direction of the pneumatic actuator 5 and is gradually flared outwards to form a guide inclined surface 14, and one side of the guide inclined surface 14, which is back to the pneumatic actuator 5, is connected with the peripheral wall of the sealing element 11; the side of the sealing projection 12 facing the pneumatic actuator 5 forms a stop surface 15 that limits the movement of the sealing projection 12 towards the pneumatic actuator 5.

The pneumatic actuator 5 includes a cover 51 fixedly attached to the bonnet 2, a piston 52 slidably disposed in the cover 51, and a main spring 53 for driving the piston 52 to move. The valve rod 3 extends into the cover body 51 and is fixedly connected with the piston 52, the position of the valve rod 3 inside the cover body 51 is in threaded connection with the switch indicating rod 16, the position of the cover body 51 corresponding to the switch indicating rod 16 is provided with an observation hole 17, and the observation hole 17 is in threaded connection with the plastic glass cover 18. The switch indicating rod 16 is driven by the valve rod 3 to reciprocate towards the observation hole 17, and the switch indicating rod 16 is in threaded connection with the valve rod 3 and is used for adjusting the distance between the switch indicating rod 16 and the observation hole 17. An annular bulge 19 which protrudes outwards is formed on the outer wall of the cover body 51 around the observation hole 17, an annular blocking edge 20 which extends towards the annular bulge 19 is arranged on the plastic glass cover 18, and the annular blocking edge 20 is positioned on the outer ring of the annular bulge 19.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a pneumatic diaphragm valve, includes valve body (1), sets up in valve gap (2) of valve body (1), installs in valve rod (3) of valve gap (2), sets up diaphragm (4) between valve gap (2) and valve body (1) and drives pneumatic actuator (5) of valve rod (3) motion, its characterized in that: the diaphragm (4) is fixedly provided with a first connecting piece (6), a butt joint assembly (7) is arranged between the first connecting piece (6) and the valve rod (3), a butt joint block (8) surrounding the first connecting piece (6) is arranged on the diaphragm (4), a valve core (9) is arranged between the valve rod (3) and the butt joint block (8), the valve core (9) and the butt joint block (8) are limited and fixed by the valve rod (3) and the diaphragm (4), a second connecting piece (10) is fixedly arranged on the diaphragm (4), and the second connecting piece (10) is matched with the valve core (9) and the butt joint block (8) to realize linkage with the valve rod (3).

2. The pneumatic diaphragm valve of claim 1, wherein: the second connecting piece (10) is provided with a plurality of in surrounding around butt joint piece (8), and adjacent the interval sets up between butt joint piece (8), second connecting piece (10) are elastic material.

3. The pneumatically actuated diaphragm valve of claim 2, wherein: the second connecting piece (10) comprises a connecting section (101) integrally connected with the diaphragm (4) and a limiting section (102) integrally connected with the connecting section (101) and clamped and fixed by the valve core (9) and the butt joint block (8).

4. The pneumatic diaphragm valve of claim 1, wherein: the butt joint component (7) comprises an insertion hole (71) formed in the valve rod (3) and used for inserting the first connecting piece (6) and a spiral line (72) formed in the insertion hole (71) and in threaded connection with the first connecting piece (6).

5. The pneumatic diaphragm valve of claim 1, wherein: be equipped with annular sealing member (11) of circle between valve rod (3) and valve gap (2), the periphery wall of sealing member (11) is equipped with annular sealed protruding (12), valve gap (2) are gone up and are equipped with seal groove (13) with its adaptation to the position of sealed protruding (12), sealed protruding (12) outer peripheral face is extended towards pneumatic actuator (5) direction and outwards is the flaring gradually and sets up and form a guide inclined plane (14), guide inclined plane (14) one side and the periphery wall of sealing member (11) pneumatic actuator (5) dorsad are connected, sealed protruding (12) form one side towards pneumatic actuator (5) and restrict sealed protruding (12) spacing face (15) towards pneumatic actuator (5) motion.

6. The pneumatic diaphragm valve of claim 1, wherein: pneumatic actuator (5) including installing in lid (51) of valve gap (2), slide and set up piston (52) and main spring (53) of drive piston (52) motion in lid (51), valve rod (3) extend into lid (51) in be connected with piston (52), valve rod (3) are located the inside position of lid (51) and are equipped with switch indicator lever (16), lid (51) are equipped with observation hole (17) corresponding to the position of switch indicator lever (16), be equipped with plastic glass lid (18) on observation hole (17).

7. The pneumatic diaphragm valve of claim 6, wherein: switch indicator lever (16) are towards observation hole (17) reciprocating motion under the drive of valve rod (3), switch indicator lever (16) and valve rod (3) threaded connection are used for adjusting the distance between switch indicator lever (16) and observation hole (17), plastic glass lid (18) and lid (51) threaded connection.

8. The pneumatic diaphragm valve of claim 1, wherein: the diaphragm (4) comprises a diaphragm sheet (41) and a cushion diaphragm (42) fixedly arranged on the diaphragm sheet (41), wherein the diaphragm sheet (41) is a PTFE diaphragm, and the cushion diaphragm (42) is an EPDM diaphragm.

9. The pneumatic diaphragm valve of claim 6, wherein: lid (51) outer wall is formed with outside convex annular protruding (19) around observation hole (17), be equipped with on plastic glass lid (18) towards annular protruding (19) extension annular fender edge (20), annular fender edge (20) are located the outer lane of annular protruding (19).