CN-121576438-B - High-pressure sealing ball valve for hydrogen

CN121576438BCN 121576438 BCN121576438 BCN 121576438BCN-121576438-B

Abstract

The invention discloses a high-pressure sealing ball valve for hydrogen, which relates to the technical field of ball valves and comprises a first valve body and a second valve body, wherein the first valve body and the second valve body are detachably and fixedly connected, a sealing ring is arranged at the joint of the first valve body and the second valve body, a valve seat is fixedly communicated with the second valve body, a valve rod is rotatably arranged in the valve seat, and an opening and closing mechanism is commonly arranged between the first valve body and the second valve body. The pressure self-adaptive control valve has the advantages that pressure self-adaptive adjustment is realized through opening and closing and sealing actions, fluctuation of working conditions is dynamically adapted, excessive abrasion of parts is avoided while sealing reliability is guaranteed, instantaneous leakage risk in the opening and closing stage of a traditional valve is reduced, meanwhile, impact damage and operation resistance of the parts are remarkably reduced by means of multiple buffer structures and friction optimization, convenience in operation and maintenance of equipment is improved, service life is effectively prolonged, and severe working condition requirements of high-pressure hydrogen transportation are met.

Inventors

CHEN GANG
HUANG ZHIHUI
HUA JIANYU
CHEN CHAO
LI ZHAO
XU JIANMING
WAN CHUNMEI
ZHONG SHENGHONG

Assignees

四川飞球（集团）有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (10)

1. The high-pressure sealing ball valve for the hydrogen comprises a first valve body (1) and a second valve body (2), and is characterized in that the first valve body (1) is detachably and fixedly connected with the second valve body (2), a sealing ring is arranged at the joint of the first valve body (1) and the second valve body (2), a valve seat (4) is fixedly communicated with the second valve body (2), a valve rod (3) is rotationally arranged on the valve seat (4), and an opening and closing mechanism is jointly arranged between the first valve body (1) and the second valve body (2) and used for opening and closing the transportation of the hydrogen; The sealing device is characterized in that a sealing seat (6) is fixedly arranged on the first valve body (1), connecting rods (5) are fixedly arranged on two sides of the valve seat (4), one connecting rod (5) is fixedly connected with the second valve body (2), the other connecting rod (5) is movably connected with the first valve body (1) through the sealing seat (6), the sealing seat (6) is fixedly arranged on the first valve body (1), self-adaptive sealing mechanisms are respectively arranged between the first valve body (1), the second valve body (2) and the corresponding connecting rods (5), and the self-adaptive sealing mechanisms synchronously operate along with the opening and closing actions of the valve rods (3) to carry out self-adaptive sealing on pressure fluctuation of the sealing surfaces according to high-pressure hydrogen media; The self-adaptive sealing mechanism comprises a pushing groove (11) formed in a connecting rod (5), an extrusion part is arranged in the pushing groove (11), a piston II (18) is arranged in an upper port of the pushing groove (11) in a sealing sliding mode, the piston II (18) can be intermittently pushed by the cam (7), a piston I (13) is arranged in a sliding mode on a lower port of the pushing groove (11), extrusion grooves (16) are formed in the first valve body (1) and the second valve body (2), the two extrusion grooves (16) are communicated with the lower ports of the corresponding pushing grooves (11), inert gas (10) is filled in the pushing groove (11) between the piston I (13) and the piston II (18), sealing gaskets (9) are fixedly arranged at positions, which are in contact with a valve ball, of the first valve body (1), the second valve body (2) and the valve ball, one sides, which are far away from each other, of the sealing gaskets (9) are fixedly provided with elastic diaphragms (17), and the elastic diaphragms (17) are overlapped with the elastic diaphragms (16).
2. The high-pressure sealing ball valve for hydrogen gas according to claim 1, wherein the on-off valve mechanism comprises a valve ball (8) fixedly arranged at the lower end of the valve rod (3), a through hole is formed between the first valve body (1) and the second valve body (2), and the valve ball (8) is rotatably arranged in the through hole.
3. The high-pressure sealing ball valve for hydrogen according to claim 1, wherein sealing sheets are arranged at the lower end of the corresponding connecting rod (5) and in the sealing seat (6), and the corresponding connecting rod (5) is inserted into the sealing seat (6) in a sealing manner.
4. The high-pressure sealing ball valve for hydrogen according to claim 1, wherein a rotating cavity (22) is formed in the valve seat (4), a cam (7) is rotatably arranged in the rotating cavity (22), and the cam (7) is in an oval shape.
5. A high-pressure sealing ball valve for hydrogen gas according to claim 4, wherein said pushing groove (11) is communicated with the rotating cavity (22).
6. The high-pressure sealing ball valve for hydrogen according to claim 5, wherein the extrusion part comprises two sliding grooves (20) formed in the connecting rod (5), the two sliding grooves (20) are communicated with the pushing groove (11), a sliding block (25) is fixedly arranged on one side of the piston II (18), a baffle ring (19) is fixedly arranged at one end of the piston II (18) located in the rotating cavity (22), a plurality of steel balls (23) are rotatably arranged on one side, close to the cam (7), of the baffle ring (19), and a spring II (21) is fixedly arranged between the other end of the piston II (18) and the pushing groove (11).
7. The high-pressure sealing ball valve for hydrogen according to claim 6, wherein a compression bar (12) is fixedly arranged at the lower end of the piston I (13), a sliding block (25) is fixedly arranged at one side of the piston I (13), and the two sliding blocks (25) are both arranged in the corresponding sliding groove (20) in a sliding manner.
8. The high-pressure sealing ball valve for hydrogen according to claim 7, wherein a pressing block (14) is slidably arranged in each of the two pressing grooves (16), a first spring (15) is fixedly arranged on the lower surface of the pressing block (14), and the lower end of the first spring (15) is fixedly arranged between the pressing groove (16).
9. A high-pressure sealing ball valve for hydrogen gas according to claim 1, characterized in that Y-shaped grooves (24) are provided on both sides of the two sealing gaskets (9) which are close to each other.
10. A high-pressure sealing ball valve for hydrogen gas according to claim 9, wherein said elastic membrane (17) is provided on the back side of the sealing gasket (9) at the corresponding position of the Y-shaped groove (24).

Description

High-pressure sealing ball valve for hydrogen Technical Field The invention relates to the technical field of ball valves, in particular to a high-pressure sealing ball valve for hydrogen. Background At the moment of the vigorous development of the hydrogen energy industry, the safe transportation of high-pressure hydrogen is a core technical bottleneck for restricting the large-scale promotion of the industry. The hydrogen has the characteristics of small molecular volume and extremely strong permeability, and the hydrogen embrittlement phenomenon of the material is extremely easy to be caused under the high-pressure working condition, so that the critical performance requirement is put forward on a key component 'ball valve' in a conveying system. However, the conventional ball valve has a plurality of defects that the sealing performance is excessively dependent on a fixed compression structure, dynamic adjustment capability is lacking, the sealing surface cannot be adapted to pressure fluctuation in the hydrogen conveying process, gaps are easily formed in the sealing surface due to insufficient compression force when the pressure is suddenly increased, hydrogen leakage is caused, excessive extrusion of the sealing surface is caused by the fixed compression force when the pressure is suddenly reduced, the abrasion process is accelerated, the sealing surface and the valve ball are directly and hard contacted in the opening and closing process of the valve, impact damage is easily caused to the sealing surface and the valve ball, the acting force required for opening the valve is increased due to overlarge contact resistance, the operation convenience is poor, the material selection of the sealing assembly cannot be fully adapted to the hydrogen working condition, the hydrogen embrittlement resistance and the permeation resistance are insufficient, the problems of cracking, aging and the like are easily caused after the sealing assembly is used in a high-pressure hydrogen environment for a long time, and the sealing reliability is seriously affected. To this end, we propose a high pressure sealed ball valve for hydrogen to solve the above problems. Disclosure of Invention The invention aims to solve the problems in the background art, and provides a high-pressure sealing ball valve for hydrogen. In order to achieve the above purpose, the present invention adopts the following technical scheme: The high-pressure sealing ball valve for the hydrogen comprises a first valve body and a second valve body, wherein the first valve body and the second valve body are detachably and fixedly connected, and a sealing ring is arranged at the joint of the first valve body and the second valve body; The sealing device comprises a valve seat, a first valve body, a second valve body, a connecting rod, a sealing seat, a self-adaptive sealing mechanism, a high-pressure hydrogen medium and a sealing surface, wherein the sealing seat is fixedly arranged on the first valve body, the connecting rods are fixedly arranged on two sides of the valve seat, one of the connecting rods is fixedly connected with the second valve body, the other connecting rod is movably connected with the first valve body through the sealing seat, the sealing seat is fixedly arranged on the first valve body, the self-adaptive sealing mechanism is arranged between the first valve body, the second valve body and the corresponding connecting rods, and the self-adaptive sealing mechanism synchronously operates along with the opening and closing actions of the valve rod and performs self-adaptive sealing on the pressure fluctuation of the sealing surface according to the high-pressure hydrogen medium. In the high-pressure sealing ball valve for hydrogen, the opening and closing valve mechanism comprises a valve ball fixedly arranged at the lower end of the valve rod, a through hole is formed between the first valve body and the second valve body, and the valve ball is rotatably arranged in the through hole. In the high-pressure sealing ball valve for hydrogen, sealing sheets are arranged at the lower ends of the corresponding connecting rods and in the sealing seat, and the corresponding connecting rods are inserted in the sealing seat in a sealing manner. In the high-pressure sealing ball valve for hydrogen, a rotating cavity is formed in the valve seat, a cam is fixedly arranged on the valve rod, the cam is rotationally arranged in the rotating cavity, and the cam is in an oval shape. In the high-pressure sealing ball valve for hydrogen, the self-adaptive sealing mechanism comprises a pushing groove arranged in the connecting rod, the pushing groove is communicated with the rotating cavity, and an extrusion part is arranged in the pushing groove. In the high-pressure sealing ball valve for hydrogen, the extrusion part comprises two sliding grooves formed in the connecting rod, the two sliding grooves are communicated with the pushing groove, a piston II is