CN215635334U

CN215635334U - Diaphragm type safety valve

Info

Publication number: CN215635334U
Application number: CN202122344826.8U
Authority: CN
Inventors: 何剑
Original assignee: Universal Valve Co ltd
Current assignee: Universal Valve Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-25
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses a diaphragm type safety valve, which adopts the technical scheme that the diaphragm type safety valve comprises a diaphragm and a guide sleeve, wherein a valve rod comprises an upper valve rod and a lower valve rod, one end of the upper valve rod is connected with a wrench, the lower valve rod is connected with a recoil disc, the lower valve rod is sleeved outside the upper valve rod and is provided with an internal thread, the end surface of the recoil disc, which faces towards the lower valve rod, is coaxially provided with a connector with an external thread and a diameter smaller than that of the end surface of the recoil disc, the diaphragm sleeve is arranged outside the connector and is attached to the end surface of the recoil disc, a spring seat adjacent to the recoil disc is in abutting contact with the lower valve rod, the lower valve rod is in threaded connection with the connector, the end part of the upper valve rod, which extends into a valve body, is limited between the lower valve rod and the connector, the inner edge of the diaphragm is clamped between the lower valve rod and the recoil disc, the guide sleeve is sleeved outside the lower valve rod and jointly clamps the outer edge of the diaphragm, the outer edge of the guide sleeve is clamped between a valve cover and the diaphragm, and the outer edge of the diaphragm is clamped between the valve cover and the diaphragm, and the diaphragm in the prior art, and the problem that the diaphragm is easily caused by the connection of the diaphragm and the medium pressure is caused by the connection of the diaphragm in a clamping or gluing mode of the existing technology that the diaphragm The problem of detachment from the valve stem.

Description

Diaphragm type safety valve

Technical Field

The utility model relates to the field of safety valves, in particular to a diaphragm type safety valve.

Background

The safety valve is a special valve, wherein the opening and closing part is in a normally closed state under the action of external force, and when the pressure of a medium in equipment or a pipeline rises to exceed a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or the equipment from exceeding the specified value. The safety valve is mainly used for boiler, pressure container and pipeline, and its control pressure is not greater than specified value, so that it can play important role in protecting personal safety and equipment operation.

Safety valve structures mainly fall into two categories: lever type and spring type. The spring type means that the sealing of the valve clack and the valve seat is against the acting force of the spring. Traditional spring relief valve is under the condition of opening, the medium can overflow to spring department and lead to the spring can be corroded by the medium, finally cause the relief valve inefficacy, current partial spring relief valve can add the diaphragm between valve clack and spring, the diaphragm is connected with the valve stem and is adopted on the valve stem perisporium fluting more and with diaphragm joint or directly carry out the adhesion with diaphragm and valve stem perisporium, nevertheless under the circumstances that the diaphragm bore great pressure, the easy disconnection of being connected between diaphragm and the valve stem, the spring department can still be leaked to the medium, cause the relief valve inefficacy.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a diaphragm type safety valve which can avoid a spring from being corroded and has high connection stability.

In order to achieve the purpose, the utility model provides the following technical scheme: a diaphragm type safety valve comprises a valve seat, a valve body and a valve cover which are sequentially assembled together, wherein a valve clack sealed with the valve seat is arranged in the valve body, a recoil disc is arranged outside the valve clack, a valve rod fixedly connected with the recoil disc penetrates through the valve cover, a pair of spring seats are sleeved outside the valve rod, a spring sleeved outside the valve rod is limited between the pair of spring seats, a wrench is connected to one end, penetrating out of the valve cover, of the valve rod, the diaphragm and a guide sleeve are further included, the valve rod comprises an upper valve rod and a lower valve rod, one end of the upper valve rod is connected with the wrench, the lower valve rod is connected with the recoil disc, the lower valve rod is sleeved outside the upper valve rod and provided with internal threads, the end face, facing the lower valve rod, of the recoil disc is coaxially provided with an external thread with a diameter smaller than the end face of the recoil disc, the diaphragm is sleeved outside the connector and attached to the end face of the recoil disc, and the spring seats adjacent to the recoil disc are in abutting contact with the lower valve rod, lower valve rod and connector threaded connection, it is spacing between lower valve rod and connector to go up the tip that the valve rod stretched into in the valve body, the inward flange of diaphragm is by the centre gripping between lower valve rod and recoil dish, the uide bushing cover is located down the valve rod outer just its and the common outward flange of grasping the diaphragm of valve body, the outward flange of uide bushing is by the centre gripping between valve gap and diaphragm.

As a further improvement of the utility model, the diameter of an inner cavity of the lower valve rod, which is connected with the connector, is larger than the diameter of an inner hole, through which the upper valve rod penetrates, of the lower valve rod, a limiting ring matched with the inner cavity of the lower valve rod is arranged on the end part, which penetrates into the lower valve rod, of the upper valve rod, and a pre-tightening spring, two ends of which are respectively in top contact with the limiting ring and the connector, is arranged in the inner cavity of the lower valve rod.

As a further improvement of the utility model, the profile of an inner hole of the guide sleeve for the insertion of the lower valve rod is in a polygonal shape, and the profile of the outer wall of the lower valve rod is matched with the profile of the inner hole of the guide sleeve.

As a further improvement of the utility model, the connecting head is also sleeved with two gaskets respectively positioned above and below the diaphragm.

As a further improvement of the utility model, a sealing ring is arranged between the valve cover and the guide sleeve.

As a further improvement of the utility model, an inner hole of the spring seat which is in abutting contact with the lower valve rod and through which the upper valve rod passes is funnel-shaped, the large end of the inner hole of the spring seat faces the lower valve rod, and the end part of the lower valve rod is positioned in the large end of the inner hole of the spring seat and is in abutting contact with the inner wall of the large end of the inner hole.

As a further improvement of the utility model, the end edge of the lower valve rod extending into the spring seat is rounded.

The utility model has the beneficial effects that: the valve rod consists of an upper valve rod and a lower valve rod, the recoil disc is provided with a connector in threaded connection with the lower valve rod, the diaphragm is sleeved on the connector and clamped by the lower valve rod and the recoil disc together, compared with the prior art, the design that the inner hole of the diaphragm is fixedly connected with the valve rod in a gluing or clamping mode improves the connection stability of the diaphragm, the defect that the diaphragm is easy to separate from the valve rod when the diaphragm is pressed by a medium is avoided, and compared with the prior art, the recoil disc and the lower valve rod can be detached and replaced by a new diaphragm when the diaphragm is damaged, the disassembly and the assembly are convenient; the guide sleeve capable of pressing the outer edge of the diaphragm is sleeved outside the lower valve rod, and the guide sleeve is designed to be combined with the valve cover to limit the valve rod, so that the valve rod is ensured to be always kept in a straight state, the bending degree of the recoil disc under the action of medium lateral thrust is relieved, and the service life of the valve rod is prolonged; the diaphragm is arranged between the recoil disc and the guide sleeve, so that not only can the contact between a corrosive medium and the spring be avoided, but also the guide part of the utility model can be protected, and the blockage of the utility model caused by the solid particles in the medium or the self-crystallized medium entering the guide part can be prevented.

Drawings

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

FIG. 2 is an enlarged view of the portion A in FIG. 1

FIG. 3 is a top view of the lower stem of the present invention.

Reference numerals: 1. a valve seat; 2. a valve body; 3. a valve cover; 4. a valve plate; 5. a kick plate; 6. a valve stem; 7. a spring seat; 8. a spring; 9. a wrench; 10. a diaphragm; 11. an upper valve stem; 12. a lower valve stem; 13. a connector; 14. a guide sleeve; 15. a limiting ring; 16. pre-tightening the spring; 17. a gasket; 18. and (5) sealing rings.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals.

Referring to fig. 1 to 2, the diaphragm type safety valve of the present embodiment includes a valve seat 1, a valve body 2, and a valve cover 3 assembled together in sequence, a valve flap 4 sealed with the valve seat 1 is disposed in the valve body 2, a recoil disc 5 is disposed outside the valve flap 4, a valve rod 6 fixedly connected with the recoil disc 5 penetrates through the valve cover 3, a pair of spring seats 7 is disposed outside the valve rod 6, a spring 8 sleeved outside the valve rod 6 is limited between the pair of spring seats 7, and a wrench 9 is connected to one end of the valve rod 6 penetrating out of the valve cover 3;

based on the prior art, the valve rod 6 is divided into an upper valve rod 11 and a lower valve rod 12, the upper valve rod 11 penetrates through the valve cover 3, the wrench 9 is connected with the end part of the upper valve rod 11 penetrating out of the valve cover 3, the peripheral wall of the end part of the upper valve rod 11 positioned in the valve cover 3 is integrally formed with a limiting ring 15, the limiting ring 15 and the upper valve rod 11 are coaxially arranged, two end faces of the lower valve rod 12 are respectively provided with an end hole matched with the diameter of the upper valve rod 11 and a cavity hole matched with the diameter of the limiting ring 15, the end hole and the cavity hole are mutually communicated, an internal thread is tapped on the hole wall of the cavity hole, a connector 13 is integrally formed on one end face of the recoil disc 5, the connector 13 and the recoil disc 5 are coaxially arranged, the peripheral wall of the connector 13 is provided with an external thread, the diameter of the connector 13 is smaller than that of the end face of the recoil disc 5, the height of the cavity hole is larger than that of the connector 13, the connector 10 and a guide sleeve 14 are included, the diaphragm 10 has elasticity, the inner hole of the guide sleeve 14 is matched with the lower valve rod 12;

in the assembling process, an inner hole of a diaphragm 10 is sleeved on a connector 13, the diaphragm 10 is attached to the end face of a recoil disc 5, the end part of an upper valve rod 11, which is not provided with a limiting ring 15, penetrates through a cavity hole and an end hole of a lower valve rod 12 in sequence, then the cavity hole of the lower valve rod 12 is connected with the connector 13 through threads until the end part of the lower valve rod 12 and the end face of the recoil disc 5 clamp the diaphragm 10 together, then the recoil disc 5 is arranged in a valve body 2 and is in top contact with a valve seat 1, the outer edge of the diaphragm 10 is arranged on a convex ring on the inner wall of the valve body 2, a guide sleeve 14 is utilized to sleeve the lower valve rod 12 from one end of the upper valve rod 11, which is positioned outside the lower valve rod 12, meanwhile, the guide sleeve 14 and the convex ring in the valve body 2 clamp the outer edge of the diaphragm 10 together, then one spring seat 7, a spring 8 and the other spring seat 7 are sleeved outside the upper valve rod 11 in sequence, and the spring seat 7 firstly sleeved on the upper valve rod 11 is in top contact with the end part of the lower valve rod 12, finally, the valve cover 3 is sleeved outside the upper valve rod 11, the end part of the valve cover 3 is pressed on the guide sleeve 14, the valve cover 3 and a convex ring in the valve body 2 clamp the diaphragm 10 and guide the diaphragm to the outer edge of the guide sleeve 14 together, and the wrench 9 is connected to the end part of the upper valve rod 11 penetrating out of the valve cover 3;

compared with the design that the inner hole of the diaphragm 10 is fixedly connected with the valve rod 6 in a gluing or clamping mode in the prior art, the design that the diaphragm 10 is clamped by the recoil disc 5 and the lower valve rod 12 improves the connection stability of the diaphragm 10, avoids the defect that the diaphragm 10 is easy to separate from the valve rod 6 when being pressed by a medium, and compared with the prior art, the recoil disc 5 and the lower valve rod 12 can be detached and replaced by a new diaphragm 10 when the diaphragm 10 is damaged, and the disassembly and the assembly are convenient; the guide sleeve 14 is designed to limit the valve rod 6 together with the valve cover 3, so that the valve rod 6 is always kept in a straight state, the bending degree of the recoil disc 5 under the medium lateral thrust is reduced, and the service life of the valve rod 6 is prolonged; the diaphragm 10 is arranged between the recoil disc 5 and the guide sleeve 14, so that not only can corrosive media be prevented from contacting the spring 8, but also the guide part of the utility model can be protected, and solid particles in the media or self-crystallization type media are prevented from entering the guide part to cause blockage of the utility model;

further optimized, referring to fig. 2, because a gap exists between the connector 13 and the lower valve rod 12 and the upper valve rod 11 can freely move relative to the lower valve rod 12, when the present invention is shaken or the recoil disc 5 moves downwards, the upper valve rod 11 collides with other parts to generate abnormal sound, which affects the safety judgment of professionals on the present invention, in order to solve the problem, a pre-tightening spring 16 is arranged in the cavity hole of the lower valve rod 12, one end of the pre-tightening spring 16 is sleeved outside the end part of the upper valve rod 11 and is attached to the ring surface of the spacing ring 15, the other end is attached to the end surface of the connector 13, in the assembling process, the pre-tightening spring 15 is firstly arranged in the lower valve rod 12, then the connector 13 is screwed into the lower valve rod 12, so that the pre-tightening spring 15 generates elastic deformation along with the gradual entering of the connector 13 into the lower valve rod 12, and then the pre-tightening spring 15 generates larger elastic force to prop the upper valve rod 11 to the position where the spacing ring 15 is contacted with the lower valve rod 12, by adopting the design, the upper valve rod 11 can be kept static relative to the lower valve rod 12, and the structural stability of the upper valve rod 11 is high.

As an improved specific embodiment, as a maintainer can regularly lift and pull the wrench 9 to avoid the phenomenon that the valve flap 4 is attached to the valve seat 1 for a long time and is adhered together, in the lifting process, the wrench 9 can drive the upper valve rod 11 to rotate relative to the valve cover 3, the upper valve rod 11 can drive parts connected with the upper valve rod 11 to rotate while rotating, if the lower valve rod 12 and the recoil disc 5 also rotate, the diaphragm 10 can be pulled to reduce the capacity of the diaphragm 10 against medium pressure, even the diaphragm 10 can be pulled to be broken, in order to solve the problem, as shown in fig. 3, the inner hole profile of the guide sleeve 14 for the lower valve rod 12 to penetrate through is in a hexagonal shape, the outer wall profile of the lower valve rod 12 is matched with the inner hole profile of the guide sleeve 14, the guide sleeve 14 is clamped by the valve cover 3 and the valve body 2 and cannot rotate, when the wrench 9 drives the upper valve rod 11 to rotate by external force, the upper valve rod 11 rotates relative to the lower valve rod 12, by the design, the lower valve rod 12 is ensured to be static relative to the guide sleeve 14, the phenomenon that the diaphragm 10 is damaged by pulling is avoided, the structural stability of the diaphragm 10 is indirectly improved, and the service life of the diaphragm 10 is prolonged.

As an improved specific embodiment, referring to fig. 2, in the assembly process, one gasket 17, the diaphragm 10 and the other gasket 17 are sequentially sleeved outside the connector 13, then the lower valve stem 12 is in threaded connection with the connector 13, and the end of the lower valve stem 12 is in top contact with the gasket 17, so that the wear of the lower valve stem 12 to the diaphragm 10 can be avoided, and meanwhile, the rotation force applied to the diaphragm 10 is small, the diaphragm 10 is indirectly protected, and the service life of the diaphragm 10 is prolonged.

As an embodiment of the improvement, referring to fig. 2, a sealing ring 18 is arranged between the valve cap 3 and the guide sleeve 14, so that not only can abrasion between the valve cap 3 and the guide sleeve 14 be avoided, but also the sealing performance between the valve cap 3 and the guide sleeve 14 can be improved to prevent medium from leaking between the valve cap 3 and the guide sleeve 14 after the diaphragm 10 is broken.

As a modified specific embodiment, referring to fig. 2, an inner hole of the spring seat 7, through which the upper stem 11 passes, in contact with the lower stem 12 is funnel-shaped, and the large end of the inner hole faces the lower stem 12, and the end of the lower stem 12 is located in the large end of the inner hole of the spring seat 7 and in contact with the inner wall of the large end of the inner hole, so that the coaxiality of the stem 6 and the spring seat 7 can be adjusted, and the connection stability of the lower stem 12 and the spring seat 7 is high;

further optimize, as shown in fig. 2, end edge of lower valve rod 12 extending into spring seat 7 is rounded, so that compared with the design that end edge of lower valve rod 12 is an edge, wear between spring seat 7 and lower valve rod 12 can be reduced, service life of lower valve rod 12 and spring seat 7 is prolonged, and overall structural stability is ensured.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.

Claims

1. The utility model provides a diaphragm type relief valve, is including disk seat (1), valve body (2) and valve gap (3) that assemble together in proper order, be provided with in the valve body (2) with disk seat (1) sealed valve clack (4), valve clack (4) are provided with recoil dish (5) outward, valve gap (3) run through have one with recoil dish (5) fixed connection's valve rod (6), valve rod (6) overcoat is equipped with mated spring holder (7), and is mated spacing between spring holder (7) is equipped with the cover and locates spring (8) outside valve rod (6), and valve rod (6) are worn out and are served and be connected with spanner (9), its characterized in that in the outer one of valve gap (3): still include diaphragm (10) and uide bushing (14), valve rod (6) including last valve rod (11) that one end links to each other with spanner (9) and lower valve rod (12) be connected with recoil dish (5), valve rod (12) cover is located and is provided with the internal thread outside last valve rod (11) down, the coaxial diameter that is provided with on the terminal surface of recoil dish (5) down valve rod (12) is less than its terminal surface and line have external screw thread connector (13), diaphragm (10) cover is located connector (13) outside and with the terminal surface laminating of recoil dish (5), neighbouring recoil dish (5) spring holder (7) and lower valve rod (12) top touch, valve rod (12) and connector (13) threaded connection down, it is spacing between lower valve rod (12) and connector (13) to go up the tip that valve rod (11) stretched into in valve body (2), the inward flange of diaphragm (10) is by the centre gripping under between valve rod (12) and recoil dish (5), the guide sleeve (14) is sleeved outside the lower valve rod (12) and clamps the outer edge of the diaphragm (10) together with the valve body (2), and the outer edge of the guide sleeve (14) is clamped between the valve cover (3) and the diaphragm (10).

2. The diaphragm safety valve of claim 1, wherein: lower valve rod (12) supply the inner chamber diameter that connector (13) are connected to be greater than its hole diameter that supplies to go up valve rod (11) and pass, go up valve rod (11) and penetrate down be provided with spacing ring (15) with lower valve rod (12) inner chamber looks adaptation on the tip in valve rod (12), valve rod (12) inner chamber is provided with both ends and pushes up pretension spring (16) that touches with spacing ring (15) and connector (13) respectively down.

3. The diaphragm safety valve according to claim 1 or 2, wherein: the inner hole profile of the guide sleeve (14) for the lower valve rod (12) to penetrate through is polygonal, and the outer wall profile of the lower valve rod (12) is matched with the inner hole profile of the guide sleeve (14).

4. The diaphragm safety valve according to claim 1 or 2, wherein: and the connecting head (13) is also sleeved with two gaskets (17) which are respectively positioned above and below the diaphragm (10).

5. The diaphragm safety valve according to claim 1 or 2, wherein: and a sealing ring (18) is arranged between the valve cover (3) and the guide sleeve (14).

6. The diaphragm safety valve according to claim 1 or 2, wherein: with lower valve rod (12) top touch spring holder (7) supply hole that upper valve rod (11) passed to be funnel shaped and main aspects lower valve rod (12), lower valve rod (12) tip is arranged in spring holder (7) hole main aspects and pushes up with the inner wall of hole main aspects and touch.

7. The diaphragm safety valve of claim 6, wherein: the end edge of the lower valve rod (12) extending into the spring seat (7) is rounded.