WO2019019523A1

WO2019019523A1 - Safety valve having double-sealing function

Info

Publication number: WO2019019523A1
Application number: PCT/CN2017/115382
Authority: WO
Inventors: 李谋逵; 宁波; 全琼; 朱宇; 刘毅; 韦雪丽; 张靖; 罗玮; 杨金龙; 杜霞; 安鸿; 肖维远; 吕超; 申燕飞
Original assignee: 眉山中车制动科技股份有限公司
Priority date: 2017-07-27
Filing date: 2017-12-11
Publication date: 2019-01-31
Also published as: CN107178637A; CN107178637B

Abstract

Disclosed is a safety valve having a double sealing function. The safety valve comprises a safety valve seat (1) and a valve body (2), wherein the safety valve seat (1) is connected to the valve body (2), a pressurized air through-hole (3) is arranged in the safety valve seat (1), a valve block (4) is arranged inside the valve body (2) at an outlet of the pressurized air through-hole (3), the valve block (4) is connected to a guide rod (5) arranged inside the valve body (2), an adjustment spring (6) is sleeved on the guide rod (5), the valve body (2) is provided with an atmosphere discharge hole (7), the atmosphere discharge hole (7) is in communication with a cavity (8) above the valve block (4) in the valve body (2), the valve block (4) controls the communication and non-communication between the pressurized air through-hole (3) and the cavity (8), and a sealing ring (9) cooperating with the valve block (4) to form an end face sealing and self-sealing structure is arranged at the outlet of the pressurized air through-hole (3). A double-sealing effect at a valve port effectively improves the sealing reliability of the safety valve, and when air is discharged from the safety valve, pressurized air entering the cavity (8) above the valve block (4) can allow the valve block (4) to be closed more quickly, thereby improving the closing pressure at the valve port and saving pressurized air.

Description

Safety valve with double sealing function

Technical field

The invention belongs to the technical field of safety valves, and particularly relates to a safety valve with double sealing function for limiting the magnitude of air pressure.

Background technique

The safety valve is mainly used to limit the air pressure. The pressure exceeding the set value is discharged to the atmosphere, the pressure is reduced to the set value range, and the set value can be adjusted.

The existing safety valves mainly have two forms of metal grinding surface and metal valve port rubber sealing. Among them, the sealing tape formed by the metal grinding surface, after a certain period of operation, the polishing surface will be scratched, causing the safety valve to leak and the durability is not high; and the metal valve port rubber sealing structure is close to the safety valve discharge pressure when the pressure is close to the safety valve discharge pressure The sealing performance is lowered, and when there is a foreign matter between the metal valve port and the rubber member, the safety valve leaks.

Summary of the invention

An object of the present invention is to provide a safety valve having a double sealing effect and high sealing reliability in view of the above problems.

The technical solution of the present invention is achieved by a safety valve having a double sealing function, comprising a safety valve seat and a valve body, the safety valve seat being connected with the valve body, and the safety valve seat is provided with pressure An air through hole, wherein a valve block is disposed at an outlet of the pressure air through hole in the valve body, and the valve block is connected to a guide rod disposed in the valve body, and the sleeve is adjusted on the guide rod a spring, wherein the valve body is provided with an exhaust air hole, the exhaust air hole communicates with the valve body and the upper chamber of the valve block, and the pressure air through hole and the chamber are controlled to pass through the valve block, and the pressure air is The outlet of the through hole is provided with a sealing ring which cooperates with the valve block to form an end face seal and a self-sealing structure.

The safety valve with dual sealing function according to the invention has an outer ring on the sealing ring a convex portion and an inner ring lip, the outer ring protrusion of the sealing ring is pressed tightly with the end surface of the valve block to form an end face sealing structure, and the inner ring lip of the sealing ring is pressed under the action of pressurized air The lower end surface of the valve block forms a self-sealing structure, and the outer ring convex portion and the inner ring lip of the sealing ring both seal the end surface of the valve block.

The safety valve with double sealing function of the present invention is provided with an upper annular groove and a lower annular groove on the safety valve seat, and the upper structure of the sealing ring is placed in the upper annular groove of the safety valve seat. The lower annular stop boss of the seal ring is placed in the lower annular groove of the safety valve seat.

The safety valve with dual sealing function according to the present invention has the outer ring protrusion portion located outside the upper annular groove of the safety valve seat and the height of the outer ring protrusion portion raised in the natural state. At the end face of the safety valve seat, when the valve block presses the outer ring protrusion of the sealing ring, the outer ring protrusion of the sealing ring is deformed and pressed into the upper annular groove of the safety valve seat.

The safety valve with dual sealing function according to the present invention has an outer ring convex portion of the sealing ring having a circular arc shape, and the outer ring convex portion is clamped by a step of the valve block and the safety valve seat to form an end surface. In the sealing structure, the inner ring lip is pressed against the end surface of the valve block by the pressurized air to form a self-sealing structure, and the end face sealing structure and the self-sealing structure are independent of each other, and are double sealing structures formed on the same sealing end face.

In the safety valve with dual sealing function according to the present invention, the exhaust air hole is disposed obliquely downward on the valve body.

The safety valve with dual sealing function according to the present invention is provided with a guiding sleeve between the valve block and the valve body.

The safety valve with dual sealing function of the present invention has one end of the guiding rod pressed against the valve block, and the other end of which is sleeved with an adjusting screw sleeve, and the outer circumference of the adjusting screw sleeve is screwed with the inner wall of the valve body. One end of the adjusting spring abuts against the step end surface of the guiding rod, and the other end abuts against the end surface of the adjusting screw sleeve, and adjusts the axial position of the screw sleeve in the valve body to adjust the pre-tightening pressure of the adjusting spring.

The safety valve with dual sealing function according to the present invention is provided above the adjusting screw sleeve A nut connected to the valve body is provided with a breathing hole communicating with the spring chamber of the upper portion of the valve body.

The invention has the effect of double sealing at the valve mouth by providing a sealing ring capable of forming an end face seal and a self-sealing structure with the valve block at the valve port, thereby effectively improving the sealing reliability of the safety valve and avoiding leakage of the safety valve. The problem, and the safety valve of the present invention, when venting, the pressure air entering the chamber above the valve block can close the valve block more quickly, increase the closing pressure at the valve port, and save pressure air.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

Figure 2 is a schematic view showing the structure of the seal ring of the present invention.

Marked in the figure: 1 is a safety valve seat, 1a is the upper annular groove, 1b is the lower annular groove, 2 is the valve body, 3 is the pressure air through hole, 4 is the valve block, 5 is the guide rod, 6 is the adjustment spring, 7 For venting the air hole, 8 is the chamber, 9 is the sealing ring, 9a is the outer ring convex part, 9b is the inner ring lip, 10 is the adjusting screw sleeve, 11 is the nut, 12 is the breathing hole, 13 is the guiding sleeve .

Detailed ways

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

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1, a safety valve having a double sealing function includes a safety valve seat 1 and a valve body 2, and the safety valve seat 1 is coupled with a valve body 2, and the safety valve seat 1 is provided with a pressure air through hole 3 is provided in the valve body 2 at the outlet of the pressure air through hole 3 with a valve block 4, and a guide sleeve 13 is disposed between the valve block 4 and the valve body 2, the valve block 4 is connected to a guide rod 5 disposed in the valve body 2, and an adjustment spring 6 is sleeved on the guide rod 5, and an exhaust hole 7 is provided on the valve body 2, and the exhaust air hole 7 is at the valve The body 2 is disposed obliquely downward to make it have a certain dustproof and waterproof effect, and the row is large The air hole 7 communicates with the chamber 8 in the valve body 2 and above the valve block 4, and controls the opening and closing of the pressure air through hole 3 and the chamber 8 through the valve block 4, and the valve is disposed at the outlet of the pressure air through hole 3 The block 4 cooperates to form the seal ring 9 of the end face seal and the self-sealing structure, and the impact force when the valve block jumps does not have a destructive influence on the sealing performance of the seal ring, and the durability is better.

As shown in FIG. 2, an outer ring boss 9a and an inner ring lip 9b are disposed on the seal ring 9, and the outer ring boss 9a of the seal ring 9 is pressed tightly with the end surface of the valve block 4 to form a press fit. In the end face sealing structure, the inner ring lip 9b of the sealing ring 9 is pressed against the lower end surface of the valve block 4 under the action of pressurized air to form a self-sealing structure, and the outer ring protrusion 9a and the inner ring lip of the sealing ring 9 Port 9b seals the end faces of the valve block 4.

Wherein, the safety valve seat 1 is provided with an upper annular groove 1a and a lower annular groove 1b, and the upper structure of the sealing ring 9 is placed in the upper annular groove 1a of the safety valve seat 1, the lower part of the sealing ring 9 The annular stop boss is placed in the lower annular groove 1b of the safety valve seat 1, and in the natural state, the outer ring boss 9a is located outside the upper annular groove 1a of the safety valve seat 1, and outside The raised height of the ring boss 9a is higher than the end face of the safety valve seat 1, and when the valve block 4 presses the outer ring boss 9a of the seal ring 9, the outer ring boss 9a of the seal ring 9 is produced. It must be deformed and pressed against the upper annular groove 1a of the safety valve seat 1.

In this embodiment, the outer ring protrusion 9a of the sealing ring 9 has a circular arc-shaped structure, and the outer ring protrusion 9a is clamped by the step of the valve block 4 and the safety valve seat 1 to form an end face sealing structure. The inner ring lip 9b is pressed against the end surface of the valve block 4 by a pressurized air to form a self-sealing structure, and the end face sealing structure and the self-sealing structure are independent of each other, and are double sealing structures formed on the same sealing end surface, that is, If the end face sealing structure fails, when the pressurized air enters, the pressure air acts on the inner ring lip, so that the inner ring lip is pressed against the end surface of the valve block to form a sealing structure, thereby effectively preventing the leakage of the pressure air.

Wherein, one end of the guiding rod 5 is pressed against the valve block 4, and the other end of the adjusting rod 5 is sleeved with an adjusting screw sleeve 10. The outer circumference of the adjusting screw sleeve 10 is screwed with the inner wall of the valve body 2, and one end of the adjusting spring 6 is abutted. Leaning on guidance The step end surface of the rod 5 abuts against the end surface of the adjusting nut 10, and adjusts the axial position of the screw sleeve 10 in the valve body 2 to adjust the pre-tightening pressure of the adjusting spring 6, in the adjusting screw sleeve A nut 11 connected to the valve body 2 is disposed above the valve 10 to prevent foreign matter from entering the inside of the valve. The valve body 2 is provided with a breathing hole 12 that communicates with a spring chamber of the upper portion of the valve body 2.

The working principle of the invention is that the pressurized air enters from the through hole of the pressure air, and the sealing ring has an inner ring lip which fits on the bottom surface of the valve block. When the pressure air through hole has pressure, a self-sealing structure is formed here. At the same time, the outer ring of the sealing ring is a circular arc-shaped convex portion, which is compressed by the valve block to form an end face seal, thereby forming a double sealing tape sealing structure. When the pressure exceeds the set value, the pressure air pushes the valve block upwards against the adjustment spring resistance, the sealing band composed of the sealing ring and the valve block fails, and the pressurized air flows from the pressure air through hole to the upper cavity of the valve block through the opened valve port. The chamber is then discharged to the atmosphere and discharged to the atmosphere. The pressure air flowing into the upper chamber of the valve block forms a back pressure above the valve block, so that the valve block can be closed in time, the closing pressure at the valve port is increased, and the pressure air is saved.

When the initial setting value needs to be adjusted, the adjusting screw sleeve is screwed into the valve body, and the set value is gradually increased. If the adjusting screw sleeve is screwed out of the valve body, the set value is gradually decreased, and the set value is adjusted after being adjusted. , locked by a nut to prevent set value changes.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A safety valve having a double sealing function, comprising a safety valve seat (1) and a valve body (2), the safety valve seat (1) being coupled with a valve body (2) at the safety valve seat (1) A pressure air through hole (3) is disposed on the valve body (2), and a valve block (4) is disposed at an outlet of the pressure air through hole (3), the valve block (4) ) is connected to a guide rod (5) disposed in the valve body (2), and an adjustment spring (6) is sleeved on the guide rod (5), and an air hole is arranged on the valve body (2) (7), the exhaust air hole (7) communicates with the upper chamber (8) of the valve body (2) and the valve block (4), and the pressure air through hole (3) and the chamber are controlled by the valve block (4) (8) The opening and closing of the pressure air through hole (3) is provided with a sealing ring (9) which cooperates with the valve block (4) to form an end face seal and a self-sealing structure.
A safety valve with double sealing function according to claim 1, characterized in that an outer ring boss (9a) and an inner ring lip (9b) are provided on the sealing ring (9), the seal The outer ring protrusion (9a) of the ring (9) is press-fitted with the end surface of the valve block (4) to form an end face sealing structure, and the inner ring lip (9b) of the sealing ring (9) is under the action of pressurized air Pressing on the lower end surface of the valve block (4) forms a self-sealing structure, and the outer ring boss portion (9a) and the inner ring lip port (9b) of the seal ring (9) seal the end faces of the valve block (4) .
The safety valve with double sealing function according to claim 2, characterized in that the safety valve seat (1) is provided with an upper annular groove (1a) and a lower annular groove (1b), the sealing ring ( The upper structure of 9) is placed in the upper annular groove (1a) of the safety valve seat (1), and the lower annular stop boss of the sealing ring (9) is placed in the lower annular groove of the safety valve seat (1) ( 1b).
A safety valve with double sealing function according to claim 3, characterized in that in the natural state, the outer ring projection (9a) of the sealing ring (9) is located at the upper part of the safety valve seat (1). Outside the groove (1a), and the height of the convex portion of the outer ring protrusion (9a) is higher than the end surface of the safety valve seat (1), when the valve block (4) will protrude the outer ring of the sealing ring (9) (9a) When the pressure is tight, the outer ring of the sealing ring (9) The boss (9a) is deformed and pressed into the upper annular groove (1a) of the safety valve seat (1).
The safety valve with dual sealing function according to claim 2, characterized in that the outer ring protrusion (9a) of the sealing ring (9) has a circular arc-shaped structure, and the outer ring protrusion (9a) The end face sealing structure is formed by the stepping of the valve block (4) and the safety valve seat (1), and the inner ring lip (9b) is pressed against the end surface of the valve block (4) by a pressurized air to form a self-sealing structure. The end face sealing structure and the self-sealing structure are independent of each other and are a double sealing structure formed on the same sealing end face.
A safety valve with a double sealing function according to claim 1, characterized in that the venting opening (7) is arranged obliquely downward on the valve body (2).
A safety valve with a double sealing function according to claim 1, characterized in that a guide sleeve (13) is arranged between the valve block (4) and the valve body (2).
The safety valve with dual sealing function according to any one of claims 1 to 7, characterized in that: one end of the guiding rod (5) is pressed against the valve block (4), and the other end is slidably sleeved Adjusting the threaded sleeve (10), the outer circumference of the adjusting nut (10) is screwed to the inner wall of the valve body (2), one end of the adjusting spring (6) abuts against the step end surface of the guiding rod (5), and the other end of the adjusting spring (6) The preloading pressure of the adjusting spring (6) is adjusted by adjusting the axial position of the nut (10) in the valve body (2) against the end surface of the adjusting nut (10).
A safety valve with double sealing function according to claim 8, characterized in that a nut (11) connected to the valve body (2) is arranged above the adjusting nut (10), in the valve body (2) A breathing hole (12) communicating with a spring chamber at an upper portion of the valve body (2) is provided.