CN217234367U

CN217234367U - Safety alarm valve

Info

Publication number: CN217234367U
Application number: CN202220982702.4U
Authority: CN
Inventors: 姚保纯
Original assignee: Changzhou Bairui Gas Technology Co Ltd
Current assignee: Changzhou Bairui Gas Technology Co Ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-08-19
Anticipated expiration: 2032-04-25

Abstract

The utility model relates to a safety alarm valve, which comprises a valve body and a valve core, wherein the through hole of the valve body is arranged into a limit cavity, a seal cavity and a piston cavity, the rod body comprises a locking part and a seal part, the outer diameter of the seal part is larger than that of the locking part, and the seal between the piston cavity and the limit cavity in the moving process of the valve core is ensured through a first seal ring in the seal cavity and a second seal ring on a baffle plate; the first sealing ring is a V-shaped sealing ring and is used for being matched with the sealing part of the rod body to realize sealing, the locking part of the rod body is not contacted with the first sealing ring, so that the resistance is reduced, the higher the pressure of the V-shaped sealing ring is, the better the sealing performance is, the valve core can easily move towards the operation hole under the condition of very small external force and can quickly reach the position, and the self-sealing can be realized under the very small external force; the second sealing ring is tightly pressed with the inclined plane at the joint of the first part and the second part in the piston cavity, so that the defect that the first sealing ring is not tight in sealing when the pressure in the container is too high is overcome, and the safety interlocking function of the quick-opening blind plate product is further optimized.

Description

Safety alarm valve

Technical Field

The utility model relates to a pressure vessel safety interlock technical field especially relates to a safety alarm valve.

Background

The quick-opening blind plate is used on a circular opening of a pressure pipeline or a pressure container, and can realize a mechanical device which can be quickly opened or closed; the safety interlocking device arranged on the quick-opening blind plate is required to meet the following requirements, including that when the quick-opening door reaches a preset closing part, the pressure can be boosted for operation; when the internal pressure of the pressure container is completely released, the quick-opening door can be opened; in the use process, the door opening requirement is generally considered to be met when the pressure in the container is reduced to 3-5 kpa.

The prior safety interlocking device structure of the quick-opening blind plate comprises a diaphragm type and a piston type; the piston type safety device is characterized in that under the action of external force, the valve core overcomes the external force and the spring to move upwards, so that safety interlocking is realized; however, in the use process, the self sealing form of the piston structure is realized by a sealing ring at the periphery of the valve core, the friction resistance of the sealing ring is large, the valve core cannot move under the action of an external force of 3-5kpa, and the self-sealing effect of the piston type safety interlocking device under the low-pressure working condition is poor due to the weight reduction design required when the effective pressure area of the valve core is increased to be large enough.

In view of the above problems, the designer actively makes research and innovation based on the practical experience and professional knowledge that the product engineering is applied for many years, so as to create a safety alarm valve and make it more practical.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a safety alarm valve to the defect that exists among the prior art.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a safety alarm valve comprises a valve body and a valve core, wherein a through hole is formed in the valve body in a penetrating mode along the length direction of the valve body, one end of the valve body is connected with a blind plate, an operation hole matched with a handle of the blind plate is formed in the other end of the valve body, the operation hole is communicated with the through hole, and the valve core is arranged in the through hole and can move axially to extend into or withdraw from the operation hole;

the valve core comprises a rod body and a baffle plate, the baffle plate is arranged at one end of the rod body, which is far away from the operation hole, a first sealing ring is arranged on the inner wall of the through hole, which corresponds to the rod body, and a second sealing ring is arranged on one side of the baffle plate, which faces the rod body;

and two ends of the rod body are respectively provided with a limiting block and a compression spring, the compression spring is arranged close to the baffle and drives the baffle to be far away from the operating hole, and the limiting block limits the axial movement of the valve core so that the baffle is not separated from the through hole.

Furthermore, the through hole is sequentially provided with a limiting cavity, a sealing cavity and a piston cavity along the axial direction of the through hole, the limiting cavity is communicated with the operation hole, and the inner diameters of the limiting cavity and the piston cavity are both larger than the inner diameter of the sealing cavity;

the internal diameter of sealed chamber with the external diameter of the body of rod suits, just the inner wall of sealed chamber is provided with spacing annular, first sealing washer sets up in the spacing annular, the cross-section in piston chamber with baffle profile suits.

Furthermore, the rod body is axially provided with a locking part and a sealing part, the sealing part is connected with the baffle, and the outer diameter of the sealing part is larger than that of the locking part;

the diameter of the joint of the sealing part and the locking part is gradually reduced towards the locking part, and the inner diameter of the first sealing ring is smaller than the outer diameter of the sealing part and is not in contact with the locking part.

Further, the first sealing ring is a V-shaped sealing ring.

Further, the piston cavity comprises a first portion and a second portion, the second portion is close to the sealing cavity, and the inner diameter of the first portion is larger than that of the second portion;

the outer diameter of the second sealing ring is larger than the inner diameter of the second part and is not in contact with the inner wall of the first part.

Further, the second sealing ring is an O-shaped sealing ring, and the joint of the first part and the second part is an inclined plane;

and a boss is arranged on one side of the baffle plate, which is connected with the rod body, the second sealing ring is sleeved on the outer ring of the boss, one end of the compression spring is abutted against the end face of the boss, and the other end of the compression spring is abutted against the end face of the second part.

Furthermore, a limiting sleeve is arranged in the limiting cavity, the limiting sleeve is sleeved on the outer ring of the rod body and is not in contact with the outer ring of the rod body, and the outline of the limiting block is larger than the inner ring of the limiting sleeve.

Furthermore, a sealing seat is arranged on the outer ring of the valve body, and a third sealing ring is arranged on the end face, far away from the operation hole, of the sealing seat.

Furthermore, an external thread is arranged at one end, far away from the operation hole, of the outer ring of the valve body, and the valve body is fixedly connected with the blind plate through the external thread.

The utility model has the advantages that:

in the application, the sealing between the piston cavity and the limiting cavity in the moving process of the valve core is ensured through the first sealing ring on the inner wall of the sealing cavity and the second sealing ring on the baffle plate;

the rod body is designed into a step section and comprises a locking part and a sealing part, the outer diameter of the sealing part is larger than that of the locking part, and the inner diameter of the first sealing ring is smaller than that of the sealing part and is not in contact with the locking part; the first sealing ring is a V-shaped sealing ring and is used for being matched with the sealing part of the rod body to realize sealing, the locking part of the rod body is not contacted with the first sealing ring, so that resistance cannot be generated between the first sealing ring and the second sealing ring, the V-shaped sealing ring has the characteristics of high external pressure, good sealing performance and small resistance, and can realize that the valve core can easily move towards the operation hole under the condition of very small external force (3-5 kpa), and can be quickly in place and realize self sealing under the very small external force;

the second sealing ring is tightly pressed with the inclined plane at the joint of the first part and the second part in the piston cavity, so that the defect that the first sealing ring is not tight in sealing when the pressure in the container is too high is overcome, and the safety interlocking function of the quick-opening blind plate product is further optimized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a sectional structure of a middle safety alarm valve of the present invention;

FIG. 2 is a schematic sectional view of the valve body of the present invention;

fig. 3 is a schematic view of the installation of the upper seal ring of the valve body of the present invention;

fig. 4 is a schematic sectional structure view of the valve core of the present invention;

fig. 5 is a cross sectional view of the locking state of the safety alarm valve of the utility model;

fig. 6 is another structure of the safety alarm valve of the utility model.

Reference numerals: 1. a valve body; 11. a through hole; 111. a limiting cavity; 112. sealing the cavity; 113. a piston cavity; 114. a first portion; 115. a second portion; 116. a limiting ring groove; 12. an operation hole; 13. a first seal ring; 14. a position limiting sleeve; 15. a sealing seat; 16. a third seal ring; 17. an external thread; 2. a valve core; 21. a rod body; 211. a locking portion; 212. a sealing part; 22. a baffle plate; 221. a boss; 222. a second seal ring; 23. a limiting block; 24. compressing the spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The special requirements of 3.2.16 on the design of the quick-opening pressure vessel according to TSJ21-2016 safety and technology supervision regulations of fixed pressure vessels comprise: (1) when the quick opening door reaches a preset closing position, the pressure can be boosted for operation; (2) when the internal pressure of the pressure container is completely released, the quick-opening door can be opened. (generally considered when the pressure inside the vessel drops to 3-5 kpa).

At present including diaphragm formula and piston in the aspect of the safety interlock structure of quick-opening blind plate, wherein, the diaphragm formula is as sensitive component with the diaphragm, can realize that the case is under less atress, the diaphragm produces the motion, thereby drive the case motion, thereby realize safety interlock, the diaphragm is generally designed for the arc, and diaphragm thickness is very thin, need set up the valve and cut off safety device and container inside, only when quick-opening blind plate is opened or will be closed, just will correspond the valve and open, let safety device play safety interlock's effect, in case the maloperation, just probably produce potential safety hazard or even incident.

The piston type safety device is characterized in that under the action of external force, the valve core overcomes the external force and the spring to move upwards, so that safety interlocking is realized; however, in the use process, the self sealing mode of the piston structure realizes sealing by a sealing ring at the periphery of the valve core, the friction resistance of the sealing ring is relatively high, and the valve core cannot move under the action of an external force of 3-5 kpa.

The invention discloses a safety alarm valve, which belongs to a piston type in principle as shown in figures 1 to 6, but adopts a double-sealing mode and is matched with a valve core 2 rod body 21 structure designed by a step section, so that the valve core 2 can easily move upwards under the condition of very small external force (3-5 kpa), can be quickly positioned in place, and can realize self-sealing under the very small external force.

In this embodiment, the safety alarm valve includes a valve body 1 and a valve core 2, a through hole 11 is arranged on the valve body 1 along the length direction thereof in a penetrating manner, one end of the valve body 1 is connected with a blind plate, the other end is provided with an operation hole 12 matched with a blind plate handle, the operation hole 12 is communicated with the through hole 11, and the valve core 2 is arranged in the through hole 11 and can move along the axial direction thereof to extend into or withdraw from the operation hole 12; the valve core 2 comprises a rod body 21 and a baffle 22, the baffle 22 is arranged at one end of the rod body 21 far away from the operation hole 12, a first sealing ring 13 is arranged on the inner wall of the through hole 11 corresponding to the rod body 21, and a second sealing ring 222 is arranged on one side of the baffle 22 facing the rod body 21; two ends of the rod body 21 are respectively provided with a limiting block 23 and a pressing spring 24, the pressing spring 24 is arranged close to the baffle 22 and drives the baffle 22 to be far away from the operating hole 12, and the limiting block 23 limits the axial movement of the valve core 2, so that the baffle 22 is not separated from the through hole 11.

Further, a sealing seat 15 is arranged on the outer ring of the valve body 1, and a third sealing ring 16 is arranged on the end face, far away from the operation hole 12, of the sealing seat 15; and an external thread 17 is arranged at one end of the outer ring of the valve body 1, which is far away from the operation hole 12, and the valve body 1 is fixedly connected with the blind plate through the external thread 17.

The valve body 1 is fixedly connected with the threaded mounting hole on the blind plate through the external thread 17 on the outer ring of the valve body, after the valve body 1 is screwed on the blind plate, the end surface of the sealing seat 15 is attached to the surface of the blind plate, and the sealing performance of the attaching surfaces of the valve body 1 and the blind plate is further ensured through the third sealing ring 16; when the pressure in the container exceeds 3-5kpa, the valve core 2 overcomes the force of the compression spring 24 to move towards the operation hole 12, the rod body 21 completely blocks the operation hole 12, so that a handle on the blind plate cannot be inserted into the operation hole 12, namely, a quick-opening door cannot be opened; when the internal pressure of the pressure container is completely released, the rod body 21 is separated from the operation hole 12, so that the quick-opening door can be opened.

In the embodiment, the through hole 11 is sequentially provided with a limit cavity 111, a seal cavity 112 and a piston cavity 113 along the axial direction thereof, the limit cavity 111 is communicated with the operation hole 12, and the inner diameters of the limit cavity 111 and the piston cavity 113 are both larger than the inner diameter of the seal cavity 112; the inner diameter of the sealing cavity 112 is adapted to the outer diameter of the rod body 21, a limiting ring groove 116 is formed in the inner wall of the sealing cavity 112, the first sealing ring 13 is arranged in the limiting ring groove 116, and the section of the piston cavity 113 is adapted to the outline of the baffle plate 22.

The baffle plate 22 can move in the piston cavity 113 under the driving of the pressure in the container, and the sealing between the piston cavity 113 and the limiting cavity 111 is ensured by the first sealing ring 13 on the inner wall of the sealing cavity 112 and the second sealing ring 222 on the baffle plate 22 during the movement of the valve core 2.

As a preferred embodiment of the present application, the rod body 21 is provided with a locking portion 211 and a sealing portion 212 along the axial direction thereof, the sealing portion 212 is connected to the baffle 22, and the outer diameter thereof is larger than that of the locking portion 211; the diameter of the connection between the sealing portion 212 and the locking portion 211 is gradually reduced toward the locking portion 211, and the inner diameter of the first sealing ring 13 is smaller than the outer diameter of the sealing portion 212 and is not in contact with the locking portion 211. Wherein the first sealing ring 13 is provided as a V-shaped sealing ring.

In this embodiment, the first sealing ring 13 is a V-shaped sealing ring, and is used for sealing the sealing portion 212 of the rod body 21, and the locking portion 211 of the rod body 21 is not in contact with the first sealing ring 13, so that no resistance is generated between the first sealing ring and the first sealing ring, and the V-shaped sealing ring has the characteristics of small resistance, and can realize that the valve element 2 can easily move towards the operation hole 12 under the condition of very small external force (3-5 kpa) by matching with the stepped section design of the rod body 21, and can be quickly in place and can realize self-sealing under very small external force.

As another preferred embodiment of the present application, the piston chamber 113 includes a first portion 114 and a second portion 115, the second portion 115 is adjacent to the sealing chamber 112, and the inner diameter of the first portion 114 is larger than that of the second portion 115; the outer diameter of the second seal 222 is larger than the inner diameter of the second portion 115 and does not contact the inner wall of the first portion 114. The second sealing ring 222 is an O-ring, and the joint of the first part 114 and the second part 115 is an inclined plane; one side of the baffle 22 connected with the rod body 21 is provided with a boss 221, a second sealing ring 222 is sleeved on the outer ring of the boss 221, one end of the compression spring 24 is abutted with the end face of the boss 221, and the other end is abutted with the end face of the second part 115.

In this embodiment, the baffle 22 is moved towards the seal cavity 112 under the pressure in the container, so that the second sealing ring 222 is pressed against the inclined surface of the piston cavity 113 at the junction of the first part 114 and the second part 115, and the conical surface sealing form is similar to the conventional piston type sealing form, thereby overcoming the weak point that the first sealing ring 13 can not be tightly sealed when the pressure in the container is too high, and further optimizing the safety interlocking function of the quick-opening blind plate product.

As another preferred embodiment of the present application, a limiting sleeve 14 is disposed in the limiting cavity 111, the limiting sleeve 14 is sleeved on the outer ring of the rod 21 and does not contact with the rod, and the outline of the limiting block 23 is larger than the inner ring of the limiting sleeve 14. As shown in fig. 1, when the length of the limiting cavity 111 is too long, the limiting sleeve 14 is arranged to cooperate with the limiting block 23 to ensure that the baffle 22 does not disengage from the piston cavity 113 to lose the safety precaution function during the axial movement of the valve core 2. With further reference to the safety alarm valve shown in fig. 6, the valve body 1 is shorter, so that the stopper 23 does not need to be additionally matched with the stopper sleeve 14 to counteract the effect of the pressing spring 24, and the baffle 22 can be kept in the piston cavity 113 all the time.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A safety alarm valve comprises a valve body (1) and a valve core (2), and is characterized in that a through hole (11) is formed in the valve body (1) in a penetrating mode along the length direction of the valve body, one end of the valve body (1) is connected with a blind plate, an operation hole (12) matched with a handle of the blind plate is formed in the other end of the valve body, the operation hole (12) is communicated with the through hole (11), and the valve core (2) is arranged in the through hole (11) and can move along the axial direction of the valve core to stretch into or withdraw from the operation hole (12);

the valve core (2) comprises a rod body (21) and a baffle (22), the baffle (22) is arranged at one end, far away from the operation hole (12), of the rod body (21), a first sealing ring (13) is arranged on the inner wall of the through hole (11) corresponding to the rod body (21), and a second sealing ring (222) is arranged on one side, facing the rod body (21), of the baffle (22);

two ends of the rod body (21) are respectively provided with a limiting block (23) and a pressing spring (24), the pressing spring (24) is arranged close to the baffle (22) and drives the baffle (22) to be far away from the operating hole (12), and the limiting block (23) limits the axial movement of the valve core (2) so that the baffle (22) is not separated from the through hole (11).

2. The safety alarm valve as claimed in claim 1, wherein the through hole (11) is provided with a limiting cavity (111), a sealing cavity (112) and a piston cavity (113) along the axial direction thereof in sequence, the limiting cavity (111) is communicated with the operation hole (12), and the inner diameters of the limiting cavity (111) and the piston cavity (113) are both larger than the inner diameter of the sealing cavity (112);

the internal diameter of sealed chamber (112) with the external diameter of the body of rod (21) suits, just the inner wall of sealed chamber (112) is provided with spacing annular groove (116), first sealing washer (13) set up in spacing annular groove (116), the cross-section of piston chamber (113) with baffle (22) profile suits.

3. The safety warning valve according to claim 2, wherein the rod body (21) is provided in its axial direction with a locking portion (211) and a sealing portion (212), the sealing portion (212) being connected to the flapper (22) and having an outer diameter larger than the locking portion (211);

the diameter of the joint of the sealing part (212) and the locking part (211) is gradually reduced towards the locking part (211), and the inner diameter of the first sealing ring (13) is smaller than the outer diameter of the sealing part (212) and is not in contact with the locking part (211).

4. A safety alarm valve according to claim 3, characterised in that the first sealing ring (13) is provided as a V-shaped sealing ring.

5. The safety warning valve of claim 2, wherein the piston chamber (113) includes a first portion (114) and a second portion (115), the second portion (115) being adjacent the sealing chamber (112), the first portion (114) having an inner diameter greater than an inner diameter of the second portion (115);

the second seal ring (222) has an outer diameter larger than the inner diameter of the second portion (115) and does not contact the inner wall of the first portion (114).

6. The safety warning valve of claim 5, wherein the second sealing ring (222) is provided as an O-ring, and a junction of the first portion (114) and the second portion (115) is provided as a chamfer;

one side of the baffle plate (22) connected with the rod body (21) is provided with a boss (221), the second sealing ring (222) is sleeved on the outer ring of the boss (221), one end of the compression spring (24) is abutted to the end face of the boss (221), and the other end of the compression spring is abutted to the end face of the second portion (115).

7. A safety alarm valve according to claim 2, wherein a limiting sleeve (14) is arranged in the limiting cavity (111), the limiting sleeve (14) is sleeved on the outer ring of the rod body (21) and is not contacted with the rod body, and the outline of the limiting block (23) is larger than the inner ring of the limiting sleeve (14).

8. The safety warning valve according to claim 1, characterized in that a sealing seat (15) is provided on the outer ring of the valve body (1), and a third sealing ring (16) is provided on the end face of the sealing seat (15) remote from the operation hole (12).

9. The safety alarm valve according to claim 8, characterized in that an external thread (17) is arranged at one end of the outer ring of the valve body (1) far away from the operation hole (12), and the valve body (1) is fixedly connected with the blind plate through the external thread (17).