Electromagnetic safety shut-off valve for high-pressure hydrogen

Abstract

The electromagnetic safety shut-off valve comprises a valve body assembly and a shut-off assembly, the valve body assembly comprises a valve body, a gas inlet pipe connector, a gas outlet pipe connector, a bottom cover, a connecting base and a valve port, a big-end-up stepped groove is formed in the bottom cover, and the bottom of the stepped groove is communicated with a gas outlet cavity. The cut-off assembly comprises a guide sleeve, a magnetism isolating pipe, an electromagnetic coil, a ball seat, a steel ball, a fixed iron core, a movable iron core, a reset spring, a valve rod, a valve clack, a potential energy spring and a duplex piston, the movable iron core is provided with a countersunk head groove which is matched with the steel ball and is large in bottom and small in top, the valve rod is provided with a positioning ring groove matched with the steel ball, the valve clack is fixed to the valve rod, and the duplex piston is fixed to the valve clack. A large piston of the duplex piston is in sliding sealing fit with the inner wall of the upper half portion of the stepped groove, and a small piston of the duplex piston is in sliding sealing fit with the inner wall of the lower half portion of the stepped groove. The device has the advantages of being simple in structure, convenient to use, safe, reliable and high in practicability, and can meet the cutting requirement of high-pressure hydrogen.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve, concretely relates to a kind of electromagnetic safety cut-off valve for high-pressure hydrogen. BACKGROUND

[0002] With the development of economy and society, hydrogen energy utilization is more and more concerned. At present, pipeline hydrogen has not been popularized, and hydrogen can only be compressed and transported to users by tank car. For this delivery method, hydrogen is usually compressed to about 25MPa, which is an ultrahigh pressure in the field of gas transmission and distribution, and high-pressure hydrogen needs to be converted into low-pressure hydrogen by a pressure regulator at the user end for use. To ensure safety, an electromagnetic cut-off valve needs to be installed on the pipeline before the pressure regulator in the field to automatically cut off hydrogen delivery when the outlet pressure of the pressure regulator is abnormal. However, the existing electromagnetic cut-off valve is mainly designed for gas, and its structure is shown in Figure 1 , mainly including valve body 1', valve port 2', guide sleeve 3', valve stem 4', valve flap 5', spring 6', fixed iron core 7', moving iron core 8', electromagnetic coil 9' and the like, which cannot be applied to high-pressure hydrogen, mainly in the following aspects: 1. The material selection does not consider that hydrogen can cause hydrogen embrittlement of the material; 2. The valve flap balance structure is not used, and after the valve flap is closed with the valve port, the gas pressure will act on the valve flap, and the higher the pressure, the greater the force, which will cause difficulty in resetting. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims to provide a kind of electromagnetic safety cut-off valve for high-pressure hydrogen, which has the advantages of simple structure, convenient use, safety and reliability, and strong practicability, and can meet the use requirements of cutting off high-pressure hydrogen.

[0004] The utility model provides a kind of electromagnetic safety cut-off valve for high-pressure hydrogen gas, it is characterized by including valve body assembly and cut-off component, the valve body assembly includes valve body, the left side of valve body is equipped with the air inlet pipe joint being communicated with air inlet cavity, the right side of valve body is equipped with the air outlet pipe joint being communicated with air outlet cavity, the downside of valve body is equipped with bottom cover, bottom cover is equipped with the stepped groove of big up small down, the bottom of stepped groove is communicated with air outlet cavity, the upside of valve body is equipped with connecting seat, the valve port being communicated with air outlet cavity and air inlet cavity is equipped in valve body, the cut-off component includes the guide sleeve being fixed on connecting seat, guide sleeve is fixed with magnetic separation pipe, magnetic separation pipe outside is equipped with electromagnetic coil, the inner cavity of magnetic separation pipe lower end is fixed with ball seat, ball seat is equipped with the steel ball being distributed along circumference, the inner cavity of magnetic separation pipe upper half is fixed with fixed iron core, magnetic separation pipe between fixed iron core and ball seat is equipped with moving iron core, moving iron core and fixed iron core are equipped with return spring, the lower end of moving iron core is equipped with the countersunk groove being matched with steel ball and being big down small up, the lower half of countersunk groove is matched with the upper half of ball seat and is arranged, cut-off component further includes the valve stem sequentially passing through fixed iron core, return spring, moving iron core, ball seat and guide sleeve from top to bottom, valve stem is equipped with the positioning ring groove being matched with steel ball, the lower end of valve stem is equipped with the valve flap being matched with valve port, potential energy spring is equipped between valve flap and guide sleeve, the bottom of valve flap is fixed with double piston, the big piston of double piston is slidably sealed with the upper half inner wall of stepped groove, the small piston of double piston is slidably sealed with the lower half inner wall of stepped groove.

[0005] Further, the utility model discloses a kind of electromagnetic safety cut-off valve for high-pressure hydrogen gas, wherein, the bottom of the double piston is fixed with magnet, the bottom cover is installed with the magnetic proximity sensor switch being matched with magnet, the upper end of the valve stem is fixed with operating handle.

[0006] Further, the utility model discloses a kind of electromagnetic safety cut-off valve for high-pressure hydrogen gas, wherein, the electromagnetic coil is placed on guide sleeve, the cut-off component further includes locking nut and protective cover, locking nut is installed on fixed iron core upper end and is extruded on electromagnetic coil, protective cover is sleeved on the outside of locking nut, the operating handle is in protective cover.

[0007] Further, the utility model discloses a kind of electromagnetic safety cut-off valve for high-pressure hydrogen gas, wherein, the air inlet pipe joint includes first threaded pipe, first butt joint pipe and first hook sleeve, first threaded pipe is installed on valve body by thread, the right end of first butt joint pipe is butt joint with the left end of first threaded pipe and is equipped with first sealing ring between the two, first hook sleeve is hooked on first butt joint pipe from left to right and is installed on first threaded pipe by thread.

[0008] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the outlet pipe joint includes second threaded pipe, second butt joint pipe and second hook, second threaded pipe is installed on valve body by thread, the left end of second butt joint pipe is butt joint with the right end of first threaded pipe and is equipped with second sealing ring between the two, second hook is hooked on second butt joint pipe from right to left and is installed on second threaded pipe by thread.

[0009] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the bottom cover and connecting seat are respectively fixed on valve body by screw, third sealing ring is equipped between bottom cover and valve body, first gas passage that communicates with stepped groove is equipped in bottom cover, second gas passage is equipped in valve body, the two ends of second gas passage correspond with first gas passage and outlet cavity and communicate, fourth sealing ring is equipped between connecting seat and valve body.

[0010] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the guide sleeve is fixed on connecting seat by screw, fifth sealing ring is equipped between guide sleeve and connecting seat, the lower end of the magnetic isolation pipe is fixed on guide sleeve by thread, the ball seat is equipped with the annular platform extending to all sides, and the annular platform is extruded between magnetic isolation pipe and guide sleeve, sixth sealing ring and stepped sealing element are equipped between ball seat and guide sleeve.

[0011] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the valve flap is equipped with the cylinder projecting upwards and is installed on valve rod by pin shaft, sealing ring corresponding with valve port is embedded in the bottom of valve flap, the guide sleeve is equipped with the circular platform projecting downwards, the upper and lower ends of potential energy spring correspond with the circular platform of guide sleeve and the cylinder of valve flap.

[0012] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the fixed iron core is fixed on magnetic isolation pipe by thread, the upper end of fixed iron core is equipped with the stop edge extending to all sides and being on the upside of magnetic isolation pipe, the outer wall of lock nut is installed with the O-ring abutting with protective cover, the operating handle is installed on valve rod by thread.

[0013] Further, the utility model relates to a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, wherein, the magnetic proximity sensing switch is installed on bottom cover by thread, and threaded sealing gasket is equipped between magnetic proximity sensing switch and bottom cover.

[0014] The utility model relates to a kind of electromagnetic safety cut-off valve for high-pressure hydrogen, compared with prior art, with the following advantages: the utility model is provided with valve body assembly and cut-off assembly, the valve body assembly is provided with valve body, the left side of valve body is provided with inlet pipe joint communicated with inlet cavity, the right side of valve body is provided with outlet pipe joint communicated with outlet cavity, the lower side of valve body is provided with bottom cover, the bottom cover is provided with stepped groove with large upper and small lower, the bottom of stepped groove is communicated with outlet cavity, the upper side of valve body is provided with connecting seat, the valve port communicated with inlet cavity and outlet cavity is provided in valve body, the cut-off assembly is provided with guide sleeve fixed on connecting seat, the guide sleeve is fixed with magnetic isolation tube, the magnetic isolation tube is sleeved with electromagnetic coil outside, the inner cavity of lower end of magnetic isolation tube is fixed with ball seat, the steel ball distributed along circumferential direction is provided on ball seat, the inner cavity of upper half of magnetic isolation tube is fixed with fixed iron core, the magnetic isolation tube between fixed iron core and ball seat is provided with movable iron core, the reset spring is provided between movable iron core and fixed iron core, the lower end of movable iron core is provided with sunken groove matched with steel ball and with large lower and small upper, the lower half of sunken groove is matched with upper half of ball seat, and the valve rod of cut-off assembly is sequentially passed through fixed iron core, reset spring, movable iron core, ball seat and guide sleeve from top to bottom, the positioning ring groove matched with steel ball is provided on valve rod, the valve flap matched with valve port is provided on lower end of valve rod, the potential energy spring is provided between valve flap and guide sleeve, the double piston is fixed on the bottom of valve flap, the large piston of double piston is slidingly and sealingly matched with inner wall of upper half of stepped groove, and the small piston of double piston is slidingly and sealingly matched with inner wall of lower half of stepped groove. Thus, a kind of electromagnetic safety cut-off valve for high-pressure hydrogen is formed, which is simple in structure, convenient to use, safe and reliable, and practical. In practical application, the safety cut-off valve is connected in series in high-pressure hydrogen pipeline in front side of pressure regulator through outlet pipe joint and inlet pipe joint, under normal working condition, movable iron core is in the lowest position under the action of reset spring, steel ball is clamped between upper half of sunken groove of movable iron core and ball seat and is in positioning ring groove of valve rod, steel ball blocks downward movement of valve rod and valve flap, valve port is in open state, inlet cavity and outlet cavity are communicated, when the pressure of outlet of pressure regulator is abnormal, electromagnetic coil is electrified to generate magnetic field, movable iron core moves upward under the action of magnetic field and fixed iron core and overcomes the elastic force of reset spring, when lower half of sunken groove of movable iron core is aligned with steel ball, valve rod moves downward under the action of potential energy spring and extrudes steel ball between lower half of sunken groove of movable iron core and ball seat, when valve flap moves downward with valve rod and is attached to valve port, high-pressure hydrogen pipeline is cut off.This invention features a stepped groove on the bottom cover, connecting the bottom of the groove to the outlet chamber. A double piston is fixed at the bottom of the valve disc, with the large and small pistons sliding and sealingly engaging with the upper and lower halves of the stepped groove. Utilizing this structural feature, the inner diameter of the upper half of the stepped groove and the inner diameter of the valve port are designed to be equal, i.e., the diameter of the large piston equals the inner diameter of the valve port. The cross-section of the lower half of the stepped groove is designed to be equal to the upper side of the valve disc minus the cross-section of the valve stem. When the shut-off valve is in the shut-off state, the forces exerted by hydrogen in the inlet chamber on the valve disc and the large piston are equal, and the forces exerted by hydrogen in the outlet chamber on the valve disc and the small piston are also equal, achieving valve disc balance and solving the problem of difficulty in resetting caused by gas pressure in existing technologies.

[0015] The electromagnetic safety shut-off valve for high-pressure hydrogen gas according to the present invention will be further described in detail below with reference to the specific embodiments shown in the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an existing electromagnetic shut-off valve;

[0017] Figure 2 This is a schematic diagram of the structure of an electromagnetic safety shut-off valve for high-pressure hydrogen according to the present invention.

[0018] Figure 3 for Figure 2 A magnified view of a portion of position A in the middle;

[0019] Figures 4 to 6 This is a schematic diagram showing the working relationship between the ball seat, steel ball, moving iron core, and valve stem during the cutting process. Detailed Implementation

[0020] First, it should be noted that the directional terms such as up, down, left, right, front, and back mentioned in this utility model are only descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this utility model.

[0021] like Figures 1 to 6The utility model discloses a kind of electromagnetic safety cut-off valves for high-pressure hydrogen, including valve body assembly 1 and cut-off assembly 2.The valve body assembly 1 is provided with valve body 11, the left side of valve body 11 is provided with the air inlet pipe joint 12 communicated with air inlet cavity, the right side of valve body 11 is provided with the air outlet pipe joint 13 communicated with air outlet cavity, the lower side of valve body 11 is provided with bottom cover 14, the upper big lower small step groove 141 is set on bottom cover 14, the bottom of step groove 141 is communicated with air outlet cavity, the upper side of valve body 11 is provided with connecting seat 15, the valve port 16 communicated with air outlet cavity and air inlet cavity is set in valve body 11.The cut-off assembly 2 is provided with guiding sleeve 21 sealed and fixed on connecting seat 15, magnetic tube 22 is fixed on guiding sleeve 21, magnetic coil 23 is set on the outer side of magnetic tube 22, ball seat 24 is fixed in the inner cavity of the lower end of magnetic tube 22, steel ball 25 is set on ball seat 24 and distributed along the circumference, fixed iron core 26 is fixed in the inner cavity of the upper half of magnetic tube 22, dynamic iron core 27 is set in magnetic tube 22 between fixed iron core 26 and ball seat 24, reset spring 28 is set between dynamic iron core 27 and fixed iron core 26, sunken groove 271 that is big down small up is set on the lower end of dynamic iron core 27 and cooperates with steel ball 25, the lower half of sunken groove 271 is matched with the upper half of ball seat 24, so that the upper half of ball seat 24 can enter the lower half of sunken groove 271;And the cut-off assembly 2 is provided with valve stem 29 sequentially passing through fixed iron core 26, reset spring 28, dynamic iron core 27, ball seat 24 and guiding sleeve 21 from top to bottom, positioning ring groove 291 that cooperates with steel ball 25 is set on valve stem 29, valve flap 210 that cooperates with valve port 16 is set on the lower end of valve stem 29, potential energy spring 211 is set between valve flap 210 and guiding sleeve 21, double-piston 212 is fixed on the bottom of valve flap 210, the big piston 2121 of double-piston 210 is slidably sealed with the upper half inner wall of step groove 141, and the small piston 2122 of double-piston 210 is slidably sealed with the lower half inner wall of step groove 141.

[0022] The above setting constitutes a simple structure, convenient to use, safe and reliable, practical for high pressure hydrogen electromagnetic safety cut-off valve. In actual application, the safety cut-off valve is connected in series in the high pressure hydrogen pipeline in front of the pressure regulator through the gas outlet joint 12 and the gas inlet joint 13, under normal working conditions, the moving iron core 27 is in the lowest position under the action of the reset spring 28, the steel ball 25 is clamped between the upper half of the countersunk groove 271 of the moving iron core 27 and the ball seat 24 and is in the positioning ring groove 291 of the valve rod 29, the steel ball 25 blocks the downward movement of the valve rod 29 and the valve disc 210, the valve port 16 is in the open state, the gas inlet cavity and the gas outlet cavity are communicated, when the pressure at the outlet of the pressure regulator is abnormal, the electromagnetic coil 23 is electrified to generate a magnetic field, the moving iron core 27 moves upward under the action of the magnetic field and the fixed iron core 26 and overcomes the elastic force of the reset spring 28, when the lower half of the countersunk groove 271 of the moving iron core 27 is aligned with the steel ball 25, the valve rod 29 moves downward under the action of the potential energy spring 211 and presses the steel ball 25 between the lower half of the countersunk groove 271 of the moving iron core 27 and the ball seat 24, when the valve disc 210 moves downward with the valve rod 29 to adhere to the valve port 16, the purpose of cutting off the high pressure hydrogen pipeline is achieved. The utility model discloses a stepped groove 141 is arranged on the bottom cover 14, the bottom of the stepped groove 141 is communicated with the gas outlet cavity, a double piston 212 is fixed at the bottom of the valve disc 210, the large piston 2121 and the small piston 2122 of the double piston 212 are correspondingly and slidably sealed with the upper half and the lower half of the stepped groove 141, the upper half inner diameter of the stepped groove 141 and the inner diameter of the valve port 16 are designed to be equal, that is, the diameter of the large piston 2121 is equal to the inner diameter of the valve port 16, the lower half cross section of the stepped groove 141 is designed to be equal to the upper side of the valve disc 210 minus the cross section of the valve rod 29, when the cut-off valve is in the cut-off state, the hydrogen in the gas inlet cavity acts on the valve disc 210 and the large piston 2121, and the hydrogen in the gas outlet cavity acts on the valve disc 210 and the small piston 2122, so that the valve disc 210 is balanced, and the problem that the reset is difficult in the prior art is solved. It should be noted that the stepped groove 141 refers to two grooves with different sizes arranged continuously on the bottom cover 14, and the countersunk groove 271 refers to two grooves with different sizes arranged continuously on the moving iron core 27.

[0023] As an optimization, the embodiment fixes the magnet 213 at the bottom of the double piston 210, installs the magnetic proximity switch 17 matched with the magnet 213 on the bottom cover 14, and fixes the operation handle 214 at the upper end of the valve rod 29 to facilitate the reset operation. This setting can accurately determine whether the valve 210 is lowered to the position by using the cooperation of the magnetic proximity switch 17 and the magnet 213. As an optimization, the embodiment sets the electromagnetic coil 23 on the guide sleeve 21, and makes the cut-off assembly 2 provided with the locking nut 215 and the protective cover 216, wherein the locking nut 215 is installed on the upper end of the fixed iron core 26 and is pressed on the electromagnetic coil 23, the protective cover 216 is sleeved outside the locking nut 215, and the operation handle 214 is in the protective cover 216. This setting improves the convenience of disassembling the electromagnetic coil 23, and prevents rain and dust from entering the inside of the cut-off valve by using the protective cover 216, thereby improving the safety and reliability. As an optimization, the embodiment makes the inlet pipe joint 12 and the outlet pipe joint 13 adopt a split structure to facilitate preparation and connection, specifically: the inlet pipe joint 12 includes a first threaded pipe 121, a first butt joint pipe 122 and a first hook sleeve 123, wherein the first threaded pipe 121 is installed on the valve body 11 by threading, the right end of the first butt joint pipe 122 is butt jointed with the left end of the first threaded pipe 121 and a first sealing ring is arranged between the two, and the first hook sleeve 123 is hooked on the first butt joint pipe 122 from left to right and is installed on the first threaded pipe 121 by threading; the outlet pipe joint 13 includes a second threaded pipe 131, a second butt joint pipe 132 and a second hook sleeve 133, wherein the second threaded pipe 131 is installed on the valve body 11 by threading, the left end of the second butt joint pipe 132 is butt jointed with the right end of the first threaded pipe 121 and a second sealing ring is arranged between the two, and the second hook sleeve 133 is hooked on the second butt joint pipe 132 from right to left and is installed on the second threaded pipe 131 by threading.

[0024] As the specific embodiment, the utility model discloses the bottom cover 14 and the connecting seat 15 are fixed respectively on valve body 11 through screw, to facilitate dismounting, and set up the third sealing washer between bottom cover 14 and valve body 11, set up the fourth sealing washer between connecting seat 15 and valve body 11, to guarantee the sealing property of corresponding connecting place. As the specific structure that the stepped groove 141 communicates with the outlet cavity, the first air passage 142 that communicates with the stepped groove 141 is set up in the bottom cover 14 in this specific embodiment, and the second air passage 111 is set up in the valve body 11, and the both ends of the second air passage 111 correspond with the first air passage 142 and the outlet cavity. As the specific fixing mode of the magnetic separation pipe 22 and the ball seat 24, the lower end of the magnetic separation pipe 22 is fixed on the guide sleeve 21 through screw in this specific embodiment, and the ball seat 24 is provided with the annular table 241 extending to the four sides, the annular table 241 is extruded between the magnetic separation pipe 22 and the guide sleeve 21, and the sixth sealing washer and the stepped sealing piece are arranged between the ball seat 24 and the guide sleeve 21.

[0025] As the specific embodiment, the utility model discloses the bottom cover 14 and the connecting seat 15 are fixed respectively on valve body 11 through screw, to facilitate dismounting, and set up the third sealing washer between bottom cover 14 and valve body 11, set up the fourth sealing washer between connecting seat 15 and valve body 11, to guarantee the sealing property of corresponding connecting place. As the specific structure that the stepped groove 141 communicates with the outlet cavity, the first air passage 142 that communicates with the stepped groove 141 is set up in the bottom cover 14 in this specific embodiment, and the second air passage 111 is set up in the valve body 11, and the both ends of the second air passage 111 correspond with the first air passage 142 and the outlet cavity. As the specific fixing mode of the magnetic separation pipe 22 and the ball seat 24, the lower end of the magnetic separation pipe 22 is fixed on the guide sleeve 21 through screw in this specific embodiment, and the ball seat 24 is provided with the annular table 241 extending to the four sides, the annular table 241 is extruded between the magnetic separation pipe 22 and the guide sleeve 21, and the sixth sealing washer and the stepped sealing piece are arranged between the ball seat 24 and the guide sleeve 21.

[0026] The above embodiment is only the description of the preferred embodiment of the utility model, and does not limit the protection scope of the utility model, and various deformations of the technical scheme of the utility model made by the person skilled in the art without departing from the design concept of the utility model should fall within the protection scope of the claims of the utility model.

Claims

1. An electromagnetic safety shut-off valve for high-pressure hydrogen, characterized in that, The system includes a valve body assembly (1) and a shut-off assembly (2). The valve body assembly (1) includes a valve body (11). The left side of the valve body (11) is provided with an air inlet pipe connector (12) communicating with the air inlet chamber, and the right side of the valve body (11) is provided with an air outlet pipe connector (13) communicating with the air outlet chamber. The lower side of the valve body (11) is provided with a bottom cover (14). The bottom cover (14) is provided with a stepped groove (141) that is larger at the top and smaller at the bottom. The bottom of the stepped groove (141) communicates with the air outlet chamber. The upper side of the valve body (11) is provided with a connecting seat (15). The valve port (16) connecting the air outlet and air inlet is provided. The cutting assembly (2) includes a guide sleeve (21) sealed and fixed on the connecting seat (15). A magnetic shielding tube (22) is fixed on the guide sleeve (21). An electromagnetic coil (23) is sleeved on the outside of the magnetic shielding tube (22). A ball seat (24) is fixed in the inner cavity of the lower end of the magnetic shielding tube (22). A steel ball (25) is provided on the ball seat (24) and distributed in a circumferential direction. A fixed iron core (26) is fixed in the inner cavity of the upper half of the magnetic shielding tube (22). A magnetic shielding tube between the fixed iron core (26) and the ball seat (24) is provided. (22) includes a moving iron core (27), a return spring (28) between the moving iron core (27) and the fixed iron core (26), and a countersunk groove (271) at the lower end of the moving iron core (27) that matches the steel ball (25) and is wider at the bottom and narrower at the top. The lower half of the countersunk groove (271) matches the upper half of the ball seat (24). The cutting assembly (2) also includes a valve stem (29) that passes through the fixed iron core (26), the return spring (28), the moving iron core (27), the ball seat (24), and the guide sleeve (21) from top to bottom. The valve stem (29) is provided with The positioning ring groove (291) cooperates with the steel ball (25). The lower end of the valve stem (29) is provided with a valve disc (210) that cooperates with the valve port (16). A potential energy spring (211) is provided between the valve disc (210) and the guide sleeve (21). A double piston (212) is fixed at the bottom of the valve disc (210). The large piston (2121) of the double piston (212) is in sliding sealing cooperation with the upper half of the inner wall of the stepped groove (141). The small piston (2122) of the double piston (212) is in sliding sealing cooperation with the lower half of the inner wall of the stepped groove (141).

2. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 1, characterized in that, A magnet (213) is fixed to the bottom of the double piston (212), a magnetic proximity sensor switch (17) that cooperates with the magnet (213) is installed on the bottom cover (14), and an operating handle (214) is fixed to the upper end of the valve stem (29).

3. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 2, characterized in that, The electromagnetic coil (23) is placed on the guide sleeve (21). The cutting assembly (2) also includes a locking nut (215) and a protective cover (216). The locking nut (215) is installed on the upper end of the fixed iron core (26) and pressed against the electromagnetic coil (23). The protective cover (216) is sleeved on the outside of the locking nut (215). The operating handle (214) is located in the protective cover (216).

4. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The intake pipe connector (12) includes a first threaded pipe (121), a first connecting pipe (122), and a first hook sleeve (123). The first threaded pipe (121) is threaded onto the valve body (11). The right end of the first connecting pipe (122) is connected to the left end of the first threaded pipe (121), and a first sealing ring is provided between them. The first hook sleeve (123) hooks onto the first connecting pipe (122) from left to right and is threaded onto the first threaded pipe (121).

5. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The air outlet pipe connector (13) includes a second threaded pipe (131), a second connecting pipe (132), and a second hook sleeve (133). The second threaded pipe (131) is threaded onto the valve body (11). The left end of the second connecting pipe (132) is connected to the right end of the first threaded pipe (121) and a second sealing ring is provided between them. The second hook sleeve (133) hooks onto the second connecting pipe (132) from right to left and is threaded onto the second threaded pipe (131).

6. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The bottom cover (14) and the connecting seat (15) are respectively fixed to the valve body (11) by screws. A third sealing ring is provided between the bottom cover (14) and the valve body (11). The bottom cover (14) is provided with a first air passage (142) that communicates with the stepped groove (141). The valve body (11) is provided with a second air passage (111). The two ends of the second air passage (111) are connected to the first air passage (142) and the air outlet chamber respectively. A fourth sealing ring is provided between the connecting seat (15) and the valve body (11).

7. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The guide sleeve (21) is fixed to the connecting seat (15) by screws. A fifth sealing ring is provided between the guide sleeve (21) and the connecting seat (15). The lower end of the magnetic shielding tube (22) is fixed to the guide sleeve (21) by threads. The ball seat (24) is provided with an annular platform (241) extending in all directions. The annular platform (241) is pressed between the magnetic shielding tube (22) and the guide sleeve (21). A sixth sealing ring and a stepped seal are provided between the ball seat (24) and the guide sleeve (21).

8. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The valve disc (210) has an upwardly protruding cylinder and is mounted on the valve stem (29) by a pin. The bottom of the valve disc (210) is fitted with a sealing ring corresponding to the valve port (16). The guide sleeve (21) has a downwardly protruding frustum. The upper and lower ends of the potential energy spring (211) are respectively fitted on the frustum of the guide sleeve (21) and the cylinder of the valve disc (210).

9. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The fixed iron core (26) is fixed to the magnetic shielding tube (22) by threads. The upper end of the fixed iron core (26) is provided with a retaining edge (261) that extends in all directions and is located on the upper side of the magnetic shielding tube (22). An O-ring that fits with the protective cover (216) is installed on the outer wall of the locking nut (215). The operating handle (214) is installed on the valve stem (29) by threads.

10. The electromagnetic safety shut-off valve for high-pressure hydrogen according to claim 3, characterized in that, The magnetic proximity sensor switch (17) is threaded onto the bottom cover (14), and a threaded sealing gasket is provided between the magnetic proximity sensor switch (17) and the bottom cover (14).

Images