CN217271925U

CN217271925U - Normally closed pneumatic valve

Info

Publication number: CN217271925U
Application number: CN202221129952.XU
Authority: CN
Inventors: 方占兵
Original assignee: Yuhuan Better Air Valve Co ltd
Current assignee: Yuhuan Better Air Valve Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-08-23
Anticipated expiration: 2032-05-12

Abstract

The utility model provides a normally closed pneumatic valve belongs to valve technical field. It has solved the problem of current pneumatic valve gas tightness variation after long-time the use. This normally closed pneumatic valve includes the valve body, be fixed with the disk seat on the valve body, wear to be equipped with in the disk seat and follow the gliding valve rod of disk seat direction, the one end of valve rod is fixed with the case, be fixed with the cylinder on the disk seat, the cylinder includes cylinder body and piston dish, the pressure equipment has the spring between the inner chamber roof of piston dish and cylinder body, the valve rod stretches into in the cylinder body and is fixed bottom the piston dish, piston dish top central point puts and is fixed with the guide bar, the guide bar sets up with the valve rod coaxial line, install the uide bushing that is lower extreme opening upper end confined tubular structure on the roof of cylinder body inner chamber, the upper end of guide bar stretches into in the uide bushing and can slide along the uide bushing direction. This normally closed pneumatic valve promotes the leakproofness of whole cylinder after long-time the use.

Description

Normally closed pneumatic valve

Technical Field

The utility model belongs to the technical field of the valve, a pneumatic valve is related to, especially, relate to a normally closed pneumatic valve.

Background

The pneumatic valve is a more mature valve in the existing market, and mainly is that the pneumatic element, for example the cylinder, is installed on the valve body of stop valve, drives the flexible opening and close of coming the control stop valve of valve rod of stop valve through the cylinder.

The cylinder on the current pneumatic valve generally all comprises the cylinder body, piston and push rod, the piston slides and sets up two upper and lower cavities with the inner chamber partition of cylinder body in the cylinder body inside, can set up the inlet port in two upper and lower cavities and control the valve body push rod through control admit air and exhaust and remove, but the upper chamber is in the state of keeping admitting air when the valve body is normally closed and is indoor to make the piston keep thrust, it is very high to the leakproofness requirement in whole cylinder body like this, especially after the cylinder uses more years, the seal part performance of whole cylinder descends, local slight gas leakage can appear, influence the use of pneumatic valve.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a normal close formula pneumatic valve. The technical problem that the air tightness of an existing pneumatic valve is poor after the pneumatic valve is used for a long time is solved.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a normally closed pneumatic valve, includes the valve body, be fixed with the disk seat on the valve body, wear to be equipped with in the disk seat and follow the gliding valve rod of disk seat direction, the one end of valve rod is fixed with the case, be fixed with the cylinder on the disk seat, the cylinder includes cylinder body and piston disc, its characterized in that, the pressure equipment has the spring between the inner chamber roof of piston disc and cylinder body, the valve rod stretches into in the cylinder body and fixes bottom the piston disc, piston disc top central point puts and is fixed with the guide bar, the guide bar sets up with the valve rod coaxial line, install the uide bushing that is lower extreme opening upper end confined tubular structure on the roof of cylinder body inner chamber, the upper end of guide bar stretches into in the uide bushing and can follow the uide bushing direction and slide.

The pneumatic valve of this design has in the cylinder that the spring is located between the roof and the piston dish of cylinder inner chamber, when needing to close the valve body as long as the cylinder stops to admit air and makes original air inlet pipeline pressure release can, the elasticity of spring just can promote the piston dish and push away the valve rod downwards and close the valve body, and the elasticity of spring keeps pushing away the state all the time and makes the valve body keep the state of normal close, avoided admitting air for a long time like this and led to the fact the strain to various sealing members in the whole cylinder, also can make the leakproofness in the cylinder obtain guaranteeing under long-time use.

The lower extreme and the valve rod of the piston dish of this design are connected the direction and are slided, there is the connection of guide bar in the upper end of piston dish again, the upper end of guide bar stretches into the direction slip in the uide bushing on the cylinder inner chamber roof, the valve rod sets up along the axis reciprocating motion of valve rod and guide bar with the central line with the guide bar makes whole piston dish can be fine, make the motion stability of piston dish fabulous, let sealing member on the piston dish can more durable, further promote the leakproofness of whole cylinder after long-time use.

In the normally closed pneumatic valve, a through hole is formed in the center of the top of the cylinder body, the lower end of the guide sleeve extends into the through hole and is in threaded connection with the through hole, and the guide rod extends into the guide sleeve from an opening at the lower end of the guide sleeve.

Through threaded connection fixed between the uide bushing of this design and the cylinder body, also make circumference sealed between uide bushing and the through hole after the screw thread is screwed up for the guide bar is wrapped up in the inboard of uide bushing and not exposed the sealing member isotructure between guide bar and the cylinder outside the cylinder, makes the leakproofness of whole cylinder obtain promoting. And if the air tightness problem appears in the uide bushing department, can solve through modes such as further screwing up or winding rubber tape threaded connection again, very convenient.

In the normally closed pneumatic valve, the guide sleeve has a stepped projection on an upper end thereof, which can abut against an upper end surface of the cylinder.

The step convex part is designed to prevent the guide sleeve from being excessively rotated to be screwed into the through hole, and the step convex part can form abutting seal with the upper end face of the cylinder after the guide sleeve is screwed tightly, so that the air tightness is further enhanced.

In the normally closed pneumatic valve, the central positions of the upper end surface and the lower end surface of the piston disc are respectively provided with a first cylindrical convex part and a second cylindrical convex part, the first convex part and the second convex part are respectively provided with a first threaded hole and a second threaded hole, the upper end part of the valve rod is in threaded connection with the second threaded hole, and the lower end part of the guide rod is in threaded connection with the first threaded hole.

In foretell normally closed pneumatic valve, the annular has been seted up along its circumference on the outer peripheral face of piston dish, be provided with in the annular and be used for forming sealed sealing washer with the inner chamber wall of cylinder body, the outer edge department protrusion of the lower terminal surface of piston dish has the fender edge portion that is the L shape, it forms the mounting groove to surround between the lower terminal surface of fender edge portion and piston dish, the embedded sealed pad that is circular shape that is equipped with of mounting groove.

The piston disc of the design is provided with a sealing ring which forms sealing with the inner cavity wall of the cylinder, a blocking edge is further extended from the lower end of the piston disc, a sealing gasket is further embedded in the inner side of the blocking edge, and the sealing performance between the piston disc and the inner cavity wall of the cylinder can be greatly improved by the piston disc under the double sealing of the sealing ring and the sealing gasket.

In the above-described normally closed pneumatic valve, the outer side portion of the gasket extends out of the mounting groove, and the inner side of the gasket is provided with a deformation groove along the circumferential direction thereof.

The effect that some deformation grooves were seted up to sealed inboard of filling up can let sealed the pad can take place the deformation more easily in the position in deformation groove when receiving the extrusion, prevents that the extrusion that sealed pad received from leading to excessive wearing and tearing too greatly, and the design can guarantee that the leakproofness is better in long-time use like this.

In the above-described one of the normally closed air-operated valves, the width of the deformation groove is gradually reduced with the depth of the deformation groove.

In the normally closed pneumatic valve, the upper end of the valve core is provided with a positioning hole, the lower end part of the valve rod is inserted from the positioning hole, and the side part of the valve core is provided with a positioning pin penetrating through the valve core and the valve rod.

Compared with the prior art, the product has the advantages that:

1. the pneumatic valve of this design has the spring in the cylinder, and the elasticity of spring can direct roof pressure piston dish with valve rod and case top push down close the valve body and make the valve body keep the normally closed state through the elasticity of spring, has avoided admitting air for a long time like this and has caused the damage to various sealing members in the whole cylinder, also can make the leakproofness in the cylinder obtain guaranteeing under long-time use.

3. The piston dish lower extreme of this design is connected the direction with the valve rod and slides, there is the connection of guide bar again in the upper end, the upper end of guide bar stretches into the direction slip in the uide bushing on the cylinder inner chamber roof, the valve rod sets up along the axis reciprocating motion of valve rod and guide bar with the central line with the guide bar and makes whole piston dish can be fine, make the motion stability of piston dish fabulous, let sealing member on the piston dish can more durable, further promote the leakproofness of whole cylinder after long-time use.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a half sectional view of the present invention.

In the figure, 1, a valve body; 11. a water inlet end; 12. a water outlet end; 13. a flange disk portion; 2. a valve seat; 3. a valve stem; 4. a valve core; 41. positioning holes; 5. a cylinder; 51. a piston disc; 511. a first convex part; 512. a second convex part; 513. a first threaded hole; 514. a second threaded hole; 515. a ring groove; 516. a blocking edge part; 517. mounting grooves; 52. a spring; 53. a guide bar; 54. a guide sleeve; 55. a through hole; 56. a cylinder body; 6. a seal ring; 7. a gasket; 71. a deformation groove; 8. and a positioning pin.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and fig. 2, the normally closed pneumatic valve includes a valve body 1, the valve body 1 has a water inlet end 11 and a water outlet end 12, a connection port for communicating the water inlet end 11 and the water outlet end 12 is provided between the two ends, a valve core 4 is disposed at the connection port, and the valve core 4 can move up and down to control the opening or closing of the connection port. The installation end has been seted up directly over the connector, has linked firmly disk seat 2 on the installation end, wears to be equipped with valve rod 3 in the disk seat 2, and the one end and the case 4 of valve rod 3 are connected, and outside the other end of valve rod 3 stretched out disk seat 2, locating hole 41 has been seted up to the upper end of case 4, and the lower tip of valve rod 3 inserts and the lateral part of case 4 has the locating pin 8 that runs through case 4 and valve rod 3 from locating hole 41 department. The valve rod 3 can slide along the valve seat 2 in a guiding way so as to drive the valve core 4 to move up and down to switch the connecting port. The upper end of the valve seat 2 is fixed with a cylinder 5, the cylinder 5 is composed of a cylinder body 56 with an inner cavity and a piston disc 51 dividing the inner cavity into two parts, and the inner wall of the inner cavity below the piston disc 51 is provided with an air inlet and outlet hole for connecting with an external compressor. Spring 52 is pressure-mounted between the piston disc 51 of this design and the inner chamber roof of cylinder 5, and it is fixed with piston disc 51 bottom that valve rod 3 stretches into in the cylinder 5, and piston disc 51 top central point puts and is fixed with guide bar 53, and guide bar 53 sets up with valve rod 3 coaxial line, installs the uide bushing 54 that is lower extreme opening upper end confined tubular structure on the roof of cylinder 5 inner chamber, and the upper end of guide bar 53 stretches into in the uide bushing 54 and can follow uide bushing 54 direction slip. The pneumatic valve of this design has spring 52 in the cylinder 5, then be located between the roof of the 5 inner chambers of cylinder and the piston disc 51, only need not admit air to cylinder 5 when needing to close valve body 1, spring 52's elasticity just can directly roof pressure piston disc 51 push away valve rod 3 with the pushing away downwards and make valve body 1 keep normally closed state through spring 52's elasticity close valve body 1, avoided admitting air for a long time like this and caused the damage to the various sealing members in whole cylinder 5, also can make the leakproofness in the cylinder 5 obtain guaranteeing under long-time use. The lower extreme and the valve rod 3 of the piston dish 51 of this design are connected the direction and are slided, there is the connection of guide bar 53 piston dish 51's upper end again, the upper end of guide bar 53 stretches into the direction slip in the uide bushing 54 on the cylinder 5 inner chamber roof, valve rod 3 makes the axis reciprocating motion of whole piston dish 51 fine along valve rod 3 and guide bar 53 with the central line setting with guide bar 53, make piston dish 51's motion stability fabulous, it is also better to let whole cylinder 5 get up stability in the use.

A through hole 55 is formed in the center of the top of the cylinder 5, the lower end of the guide sleeve 54 extends into the through hole 55 and is in threaded connection with the through hole 55, and the guide rod 53 extends into the guide sleeve 54 from the opening at the lower end of the guide sleeve 54. The guide sleeve 54 has a stepped projection 541 formed on the outer periphery of the upper end thereof to abut against the upper end surface of the cylinder 5. The guide sleeve 54 and the cylinder 5 are fixedly connected through threads, the guide sleeve 54 and the through hole 55 are circumferentially sealed after the threads are screwed down, the guide rod 53 is wrapped on the inner side of the guide sleeve 54 instead of being exposed outside the cylinder 5, and therefore structures such as sealing pieces between the guide rod 53 and the cylinder 5 are reduced, and the sealing performance of the whole cylinder 5 is improved. And if the air tightness problem appears at the position of the guide sleeve 54, the problem can be solved by further screwing or winding the rubber belt to be connected with the screw thread again, and the like, so that the air tightness problem is very convenient. The first design of the step convex portion 541 enables us not to excessively rotate the guide sleeve 54 to screw the guide sleeve into the through hole 55, and the second design of the step convex portion 541 enables the guide sleeve 54 to form abutting seal with the upper end face of the cylinder 5 after being screwed, so that the air tightness is further enhanced.

The center positions of the upper end surface and the lower end surface of the piston disc 51 are respectively provided with a first cylindrical convex part 511 and a second cylindrical convex part 512, the first convex part 511 and the second convex part 512 are respectively provided with a first threaded hole 513 and a second threaded hole 514, the upper end part of the valve rod 3 is in threaded connection with the second threaded hole 514, and the lower end part of the guide rod 53 is in threaded connection with the first threaded hole 513. An annular groove 515 is formed in the outer peripheral surface of the piston disc 51 along the circumferential direction of the piston disc, a sealing ring 6 used for forming sealing with the inner cavity wall of the cylinder 5 is arranged in the annular groove 515, an L-shaped edge blocking portion 516 protrudes from the outer edge of the lower end surface of the piston disc 51, a mounting groove 517 is formed between the edge blocking portion 516 and the lower end surface of the piston disc 51 in a surrounding mode, and a circular sealing gasket 7 is embedded in the mounting groove 517. The outer part of the gasket 7 extends out of the mounting groove 517, the inner side of the gasket 7 is provided with a deformation groove 71 along the circumferential direction, and the width of the deformation groove 71 gradually decreases with the depth of the deformation groove 71. The piston disc 51 of the design is provided with a sealing ring 6 which forms sealing with the inner cavity wall of the cylinder 5, the lower end of the piston disc 51 is further extended with a blocking edge, a sealing gasket 7 is embedded inside the blocking edge, and the piston disc 51 can greatly improve the sealing property between the piston disc 51 and the inner cavity wall of the cylinder 5 under the double sealing of the sealing ring 6 and the sealing gasket 7. The effect that the deformation groove 71 is formed in the inner side of the sealing gasket 7 is that the sealing gasket 7 can be deformed more easily at the position of the deformation groove 71 when being extruded, excessive abrasion caused by too large extrusion of the sealing gasket 7 is prevented, and the sealing performance can be ensured to be better in the long-time use process due to the design. The width of deformation groove 71 reduces along with the degree of depth increases and makes deformation groove 71 be isosceles trapezoid's structure design like this also can be more easily deformation in order to be close to fender edge portion 516 department, receives extrusion deformation can effectively reduce wearing and tearing, guarantees that long-term sealed is effective. All have flange dish portion 13 on the end 11 of intaking of valve body 1 and play water end 12, guarantee intensity and the stability of butt joint when flange dish portion 13 can dock with the pipeline of heavy-calibre, it has the step lug all to follow its circumference protrusion on the terminal surface of flange dish portion 13 in addition, and the step lug can support with the pipeline and lean on to form sealedly, can make again flange dish portion 13 the terminal surface outer edge and the pipeline on have certain clearance can conveniently dismantle between the outer edge of the flange.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A normally closed pneumatic valve comprises a valve body (1), a valve seat (2) is fixed on the valve body (1), a valve rod (3) capable of sliding along the guide of the valve seat (2) penetrates through the valve seat (2), a valve core (4) is fixed at one end of the valve rod (3), an air cylinder (5) is fixed on the valve seat (2), the air cylinder (5) comprises a cylinder body (56) and a piston disc (51), the normally closed pneumatic valve is characterized in that a spring (52) is arranged between the piston disc (51) and the top wall of an inner cavity of the cylinder body (56) in a pressing mode, the valve rod (3) extends into the cylinder body (56) and is fixed with the bottom of the piston disc (51), a guide rod (53) is fixed at the center of the top of the piston disc (51), the guide rod (53) and the valve rod (3) are coaxially arranged, a guide sleeve (54) of a cylindrical structure with a lower end opening and a closed upper end is installed on the top wall of the inner cavity of the cylinder body (56), the upper end part of the guide rod (53) extends into the guide sleeve (54) and can slide along the guide sleeve (54) in a guiding way.

2. The normally closed pneumatic valve according to claim 1, wherein a through hole (55) is formed in a top center of the cylinder (56), a lower end of the guide sleeve (54) extends into the through hole (55) and is in threaded connection with the through hole (55), and the guide rod (53) extends into the guide sleeve (54) from an opening at the lower end of the guide sleeve (54).

3. A normally closed air-operated valve according to claim 2, wherein an outer periphery of an upper end of the guide sleeve (54) has a stepped projection (541) capable of coming into abutment with an upper end face of the cylinder (56).

4. The normally closed air-operated valve according to claim 3, wherein the piston disc (51) is provided with a first cylindrical projection (511) and a second cylindrical projection (512) at the center positions of the upper and lower end surfaces thereof, the first projection (511) and the second projection (512) are respectively provided with a first threaded hole (513) and a second threaded hole (514), the upper end portion of the valve rod (3) is screwed into the second threaded hole (514), and the lower end portion of the guide rod (53) is screwed into the first threaded hole (513).

5. The normally closed pneumatic valve according to claim 4, wherein the outer circumferential surface of the piston disc (51) is provided with a ring groove (515) along the circumferential direction thereof, the ring groove (515) is internally provided with a sealing ring (6) for sealing with the inner cavity wall of the cylinder body (56), the outer edge of the lower end surface of the piston disc (51) protrudes with an L-shaped edge portion (516), the edge portion (516) and the lower end surface of the piston disc (51) are surrounded to form a mounting groove (517), and the mounting groove (517) is embedded with a circular sealing gasket (7).

6. A normally closed air-operated valve according to claim 5, wherein an outer side portion of the packing (7) is protruded outside the mounting groove (517), and an inner side of the packing (7) is opened with a deformation groove (71) along a circumferential direction thereof.

7. A normally closed air-operated valve according to claim 6, wherein the width of the deformation groove (71) is gradually reduced with the depth of the deformation groove (71).

8. The normally closed pneumatic valve according to any one of claims 1 to 7, wherein the valve core (4) has a positioning hole (41) formed at an upper end thereof, the valve stem (3) has a lower end inserted through the positioning hole (41), and a positioning pin (8) penetrating through the valve core (4) and the valve stem (3) is formed at a side portion of the valve core (4).

9. A normally closed pneumatic valve according to claim 8, characterised in that the inlet (11) and outlet (12) ends of the valve body (1) each have a flange portion (13) for pipe butt joint.