Safety pressure relief device for high-pressure gas cylinder for vehicle

Abstract

The utility model discloses a safety pressure relief device for a vehicle high-pressure gas cylinder, which belongs to the technical field of pressure relief devices and is characterized by comprising a gas cylinder pipe, locking mechanisms and a pressure relief mechanism, a valve body is mounted at the upper end of the gas cylinder pipe in a meshed manner, and the locking mechanisms for mounting and positioning the valve body are arranged outside the front and the rear of the valve body. And a pressure relief mechanism for releasing internal high pressure is arranged on the side wall of the right end of the valve body. The valve body is installed at the upper end of a gas cylinder pipe in a thread meshing mode, a knob is twisted to drive a first bevel gear to rotate, drive a second bevel gear to rotate in a meshing mode, drive a connected screw rod to rotate and drive a clamping plate to move downwards in a sliding groove in a meshing mode, and the clamping plate is inserted into a gear ring downwards under the limiting effect that a limiting plate is embedded into a limiting groove. The piston is pushed to move rightwards, the check ring and the second sealing ring are driven to move rightwards, the pressure relief opening is opened, gas flows out along the hydraulic opening at the moment, the pressure of high-pressure hydrogen gas is reduced, and the safe pressure relief effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of pressure relief devices, in particular to a safety pressure relief device for a vehicle-mounted high-pressure gas cylinder. Background Technique

[0002] The temperature-driven safety pressure relief device is a safety pressure relief device dedicated to high-pressure hydrogen gas cylinders. The TPRD is integrated into the bottle mouth valve, and the high-pressure bottle mouth valve is connected to the high-pressure gas cylinder through threads.

[0003] The existing pressure relief devices use the same specification washers, bursting discs, and shear rings in combination, which brings great convenience to the design, production, management, and use of this combination. By changing the discharge diameter on the safety device holder, the requirements for different discharge amounts can be achieved.

[0004] However, the existing pressure relief devices achieve the pressure relief effect by piercing the pressure relief port with a bursting disc to open the pressure relief port. When the force applied by the shear assembly or the piercing assembly does not reach the force to penetrate the pressure relief port seal at high pressure, the pressure relief port seal is not opened in time, and the safety pressure relief function cannot be achieved, which will cause a dangerous situation where the pressure cannot be relieved in time. Content of the Utility Model

[0005] The purpose of the utility model is to provide a safety pressure relief device for a vehicle-mounted high-pressure gas cylinder, which is used to solve the problem that the existing pressure relief device achieves the pressure relief effect by piercing the pressure relief port with a bursting disc to open the pressure relief port. When the force applied by the shear assembly or the piercing assembly does not reach the force to penetrate the pressure relief port seal at high pressure, the pressure relief port seal is not opened in time, and the safety pressure relief function cannot be achieved, which will cause a dangerous situation where the pressure cannot be relieved in time.

[0006] Therefore, the utility model provides a safety pressure relief device for a vehicle-mounted high-pressure gas cylinder, including a gas cylinder pipe, a locking mechanism, and a pressure relief mechanism. The upper end of the gas cylinder pipe is meshed with a valve body. A locking mechanism for installing and positioning the valve body is arranged on the front and rear outer parts of the valve body, and a pressure relief mechanism for releasing the internal high pressure is arranged on the right side wall of the valve body.

[0007] Preferably: The locking mechanism includes an outer plate. A top groove is opened inside the upper end of the outer plate. A first bevel gear is installed on the inner wall of the front end of the top groove. The front end of the first bevel gear is externally connected to a knob. A second bevel gear is installed on the inner wall of the lower end of the top groove. A chute is opened outside the lower end of the top groove. A screw rod is installed in the chute. A clamping plate is sleeved on the outer wall of the screw rod. A limiting groove is opened on the side wall of the chute. A limiting plate is installed on the side wall of the clamping plate. A toothed ring is arranged on the edge of the upper end of the gas cylinder pipe.

[0008] Preferably, the pressure relief mechanism includes a pressure relief pipe, in which an insertion shell is inserted. A temperature-sensitive glass bulb is installed in the insertion shell. A piston is installed at the left end of the temperature-sensitive glass bulb. A first sealing ring is sleeved outside the right end of the piston. Compression springs are symmetrically arranged outside the center of the piston. A retaining ring is arranged outside the left end of the piston. A second sealing ring is sleeved outside the retaining ring. An exhaust hole is arranged at the right end of the insertion shell. A pressure relief port is arranged at the rear end of the pressure relief pipe. A end plug is arranged at the rear end port of the pressure relief port. An air vent groove is arranged at the center of the valve body.

[0009] Preferably, the first bevel gear and the second bevel gear mesh with each other.

[0010] Preferably, the thread pattern provided at the lower end of the clamping plate coincides with the tooth pattern provided on the surface of the tooth ring.

[0011] Preferably, one end of the compression spring is connected to the left end of the piston, and the other end of the compression spring is connected to the inner wall of the pressure relief pipe.

[0012] Preferably, the cross-sectional shapes of the first sealing ring and the second sealing ring are both "O" shaped.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, the valve body is installed at the upper end of the gas cylinder pipe through thread engagement. Turning the knob drives the first bevel gear to rotate, which meshes with and drives the second bevel gear to rotate, driving the connected screw rod to rotate, which meshes with and drives the clamping plate to move downward in the sliding groove. Under the limitation that the limiting plate is embedded in the limiting groove, the clamping plate is inserted downward into the tooth ring. The thread pattern provided on the lower end surface of the clamping plate is clamped in the tooth pattern on the surface of the tooth ring, making the installation of the valve body more firm and stable. When there is a fire in the car, the temperature will exceed 100 degrees Celsius or even higher. At this time, the temperature-sensitive glass bulb is heated and melted and broken. The piston loses the support of the temperature-sensitive glass bulb. With the elastic release of the high-pressure gas and the compression spring in the air vent groove, the piston is pushed to move to the right, driving the retaining ring and the second sealing ring to move to the right, opening the pressure relief port. At this time, the gas flows out along the hydraulic port, reducing the pressure of the high-pressure hydrogen gas and achieving the effect of safe pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional view of the present utility model;

[0016] Figure 2 is a side sectional view of the locking mechanism of the present utility model;

[0017] Figure 3 is a side sectional view of the pressure relief mechanism of the present utility model.

[0018] In the figure:

[0019] 1. Gas cylinder tube; 2. Valve body; 301. Outer plate; 302. Top groove; 303. First bevel gear; 304. Knob; 305. Second bevel gear; 306. Slide groove; 307. Screw; 308. Clamping plate; 309. Limit groove; 310. Limit plate; 311. Tooth ring; 401. Pressure relief pipe; 402. Socket shell; 403. Piston; 404. First sealing ring; 405. Thermosensitive glass bulb; 406. Exhaust hole; 407. Compression spring; 408. Retaining ring; 409. Second sealing ring; 410. End plug; 411. Pressure relief port; 412. Venting groove. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1

[0022] Please refer to Figures 1-3 , the figure is a preferred implementation manner in the present invention. A vehicle high-pressure gas cylinder safety pressure relief device includes a gas cylinder tube 1, a locking mechanism, and a pressure relief mechanism. The upper end of the gas cylinder tube 1 is meshed and installed with a valve body 2. A locking mechanism for installing and positioning the valve body 2 is arranged on the front and rear outer parts of the valve body 2. A pressure relief mechanism for releasing the internal high pressure is arranged on the right end side wall of the valve body 2.

[0023] It should be noted that: the locking mechanism and the pressure relief mechanism in this solution improve the high efficiency and stability of the pressure relief device.

[0024] Among them, the locking mechanism includes an outer plate 301. A top groove 302 is opened inside the upper end of the outer plate 301. A first bevel gear 303 is installed on the front inner wall of the top groove 302. The front outer part of the first bevel gear 303 is connected with a knob 304. A second bevel gear 305 is installed on the lower inner wall of the top groove 302. A slide groove 306 is opened outside the lower end of the top groove 302. A screw 307 is installed in the slide groove 306. A clamping plate 308 is sleeved on the outer wall of the screw 307. A limit groove 309 is opened on the side wall of the slide groove 306. A limit plate 310 is installed on the side wall of the clamping plate 308. A tooth ring 311 is arranged on the upper end edge of the gas cylinder tube 1.

[0025] It should be noted that in this solution, the valve body 2 is installed at the upper end of the gas cylinder pipe 1 through screw meshing. Turning the knob 304 drives the first bevel gear 303 to rotate, which meshes with and drives the second bevel gear 305 to rotate, driving the connected screw 307 to rotate, which meshes with and drives the clamping plate 308 to move downward in the chute 306. Under the limitation that the limiting plate 310 is embedded in the limiting groove 309, the clamping plate 308 is inserted downward into the tooth ring 311, and the card pattern provided on the lower end surface of the clamping plate 308 is clamped in the tooth pattern on the surface of the tooth ring 311, making the installation of the valve body 2 more firm and stable.

[0026] Among them, the first bevel gear 303 and the second bevel gear 305 mesh with each other.

[0027] It should be noted that this solution makes the locking more efficient.

[0028] Among them, the card pattern provided at the lower end of the clamping plate 308 coincides with the tooth pattern provided on the surface of the tooth ring 311.

[0029] It should be noted that this solution makes the locking more stable.

[0030] Embodiment 2

[0031] Please refer to Figures 1-3 , the pressure relief mechanism includes a pressure relief pipe 401, an insertion shell 402 is inserted into the pressure relief pipe 401, a temperature-sensitive glass bulb 405 is installed in the insertion shell 402, a piston 403 is installed at the left end of the temperature-sensitive glass bulb 405, a first sealing ring 404 is sleeved outside the right end of the piston 403, compression springs 407 are symmetrically arranged outside the center of the piston 403, a retaining ring 408 is arranged outside the left end of the piston 403, a second sealing ring 409 is sleeved outside the retaining ring 408, an exhaust hole 406 is arranged at the right end of the insertion shell 402, a pressure relief port 411 is arranged at the rear end of the pressure relief pipe 401, a plug 410 is arranged at the rear end port of the pressure relief port 411, and a ventilation groove 412 is arranged in the center of the valve body 2.

[0032] It should be noted that in this solution, when there is a fire in the car, the temperature will exceed 100 degrees Celsius or even higher. At this time, the temperature-sensitive glass bulb 405 is heated and melted and broken. The piston 403 loses the support of the temperature-sensitive glass bulb 405, and the elastic release of the high-pressure gas and the compression spring 407 in the ventilation groove 412 pushes the piston 403 to move to the right, driving the retaining ring 408 and the second sealing ring 409 to move to the right, opening the pressure relief port 411. At this time, the gas flows out along the hydraulic port 411, reducing the pressure of the high-pressure hydrogen gas.

[0033] Among them, one end of the compression spring 407 is connected to the left end of the piston 403, and the other end of the compression spring 407 is connected to the inner wall of the pressure relief pipe 401.

[0034] It should be noted that: This solution makes pressure relief more efficient.

[0035] Among them, the cross-sectional shapes of the first sealing ring 404 and the second sealing ring 409 are both "O" shapes.

[0036] It should be noted that: This solution is more sealed when there is no pressure relief.

[0037] The working process and principle of the present utility model: The valve body 2 is installed at the upper end of the gas cylinder pipe 1 through thread engagement. Turning the knob 304 drives the first bevel gear 303 to rotate, which meshes and drives the second bevel gear 305 to rotate, driving the connected screw 307 to rotate, which meshes and drives the clamping plate 308 to move downward in the chute 306. Under the limitation that the limiting plate 310 is embedded in the limiting groove 309, the clamping plate 308 is inserted downward into the toothed ring 311. The card pattern provided on the lower end surface of the clamping plate 308 is clamped in the tooth pattern on the surface of the toothed ring 311, making the installation of the valve body 2 more firm and stable. When there is a fire in the car, the temperature will exceed 100 degrees Celsius or even higher. At this time, the temperature-sensitive glass bulb 405 is heated and melted and broken. The piston 403 loses the support of the temperature-sensitive glass bulb 405, and the elastic release of the high-pressure gas and the compression spring 407 in the ventilation groove 412 pushes the piston 403 to move to the right, driving the retaining ring 408 and the second sealing ring 409 to move to the right, opening the pressure relief port 411. At this time, the gas flows out along the hydraulic port 411, reducing the pressure of the high-pressure hydrogen gas.

[0038] The above content further elaborates on the present utility model in combination with specific implementation manners. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. A safety pressure relief device for a high-pressure gas cylinder for a vehicle, characterized in that: The invention comprises a gas cylinder tube (1), a locking mechanism and a pressure relief mechanism, wherein a valve body (2) is meshedly mounted on the upper end of the gas cylinder tube (1), locking mechanisms for mounting and positioning the valve body (2) are arranged on the front and rear exterior of the valve body (2), and a pressure relief mechanism for releasing the internal high pressure is arranged on the right end side wall of the valve body (2).

2. A vehicle high pressure gas cylinder safety pressure relief device according to claim 1, characterized in that: The locking mechanism comprises an outer plate (301), a top groove (302) is provided inside the upper end of the outer plate (301), a first bevel gear (303) is installed on the inner wall of the front end of the top groove (302), a knob (304) is connected to the outside of the front end of the first bevel gear (303), a second bevel gear (305) is installed on the inner wall of the lower end of the top groove (302), a slide groove (306) is provided outside the lower end of the top groove (302), a screw rod (307) is installed in the slide groove (306), a clamping plate (308) is sleeved on the outer wall of the screw rod (307), a limiting groove (309) is provided on the side wall of the slide groove (306), a limiting plate (310) is installed on the side wall of the clamping plate (308), and a toothed ring (311) is provided on the upper edge of the gas cylinder tube (1).

3. A vehicle high pressure gas cylinder safety pressure relief device according to claim 2, characterized in that: The pressure relief mechanism comprises a pressure relief pipe (401), an insert shell (402) is inserted in the pressure relief pipe (401), a temperature-sensitive glass bulb (405) is installed in the insert shell (402), a piston (403) is installed at the left end of the temperature-sensitive glass bulb (405), a first sealing ring (404) is sleeved on the right end of the piston (403), a compression spring (407) is symmetrically arranged on the center of the piston (403), a retaining ring (408) is arranged on the left end of the piston (403), a second sealing ring (409) is sleeved on the outside of the retaining ring (408), an exhaust hole (406) is arranged on the right end of the insert shell (402), a pressure relief port (411) is arranged at the rear end of the pressure relief pipe (401), an end plug (410) is arranged at the rear end of the pressure relief port (411), and a venting groove (412) is arranged at the center of the valve body (2).

4. A vehicle high pressure gas cylinder safety pressure relief device according to claim 2, characterized in that: The first bevel gear (303) and the second bevel gear (305) are meshed with each other.

5. A vehicle high pressure gas cylinder safety pressure relief device according to claim 2, characterized in that: The snap grooves provided at the lower end of the snap plate (308) match the tooth grooves provided on the surface of the toothed ring (311).

6. A vehicle high pressure gas cylinder safety pressure relief device according to claim 3, characterized in that: The left end of the piston (403) is connected to one end of a compression spring (407), and the other end of the compression spring (407) is connected to the inner wall of the pressure relief pipe (401).

7. A vehicle high pressure gas cylinder safety pressure relief device according to claim 3, characterized in that: The cross-sectional shapes of the first sealing ring (404) and the second sealing ring (409) are both "O"-shaped.

Images