An electric explosion valve for opening gas cylinders

Abstract

The present invention discloses an electric explosion valve for opening a gas cylinder. The electric explosion valve comprises a nozzle connected to the gas cylinder, a shell, a cutter for sealing and opening the gas cylinder, a spring washer for providing elastic force, and an igniter for providing power. The threaded end of the nozzle is connected to the gas cylinder, and the other end is welded and fixed to the cutter and the shell. The spring washer is installed inside the nozzle, and the igniter is installed on the shell. The igniter ignites and pushes the cutter, and the movement of the cutter breaks the film on the cutter, so that the electric explosion valve forms a passage. The electric explosion valve of the present invention has a high degree of versatility, is resistant to high and low temperatures, has a simple structure, and is economical. It can be widely used to seal and release gas in high-pressure gas cylinders.

Description

Technical Field

[0001] The invention relates to the technical field of electric explosion valves. Background Art

[0002] With the development of the aerospace field, higher requirements are being placed on aerospace power systems. Today, aerospace power systems are developing towards integration, economy, lightweight, and miniaturization. High-pressure gas cylinders are widely used in aerospace power systems. Generally, high-pressure gas cylinders are opened by electric explosion valves. Currently, most electric explosion valves are sealed with rubber rings and gaskets. However, during the operation of the aircraft, the internal temperature fluctuates greatly with the operating time and changes in the external environment. High and low temperatures may occur, affecting the performance of the rubber rings and gaskets, resulting in the electric explosion valve's sealing performance not meeting the requirements. At the same time, the detonation pressure of the igniter in the electric explosion valve is relatively stringent, and the overall reliability needs to be improved. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide an electric explosion valve for opening a gas cylinder which has good sealing performance, high temperature resistance and a wider range of applications.

[0004] The technical solution adopted by the present invention is an electric explosion valve for opening a gas cylinder, comprising a shell with a three-way structure, a cutter installed in the shell, a nozzle installed in the front of the shell, the nozzle connected to the gas cylinder, and an igniter connected to the rear side of the shell. The cutter comprises an end and a column, a film is provided on the end, the film is welded at the connection between the nozzle and the shell, and the rear end face of the column is kept a distance from the igniter. The diameter of the end of the cutter is larger than the diameter of the column, and the rear edge of the end is a tapered clamping surface.

[0005] The housing includes a cutter head cavity, a clamp cavity and an ignition cavity from front to back. The cutter head cavity is downwardly an exhaust cavity. The end of the cutter slides in the cutter head cavity. The column of the cutter is in clearance with the clamp cavity. An inner conical surface is provided at the junction of the cutter head cavity and the clamp cavity of the housing. The inner conical surface is adapted to the conical clamping surface of the cutter end. The angle of the inner conical surface is 1°-3° smaller than the angle of the clamping surface of the end.

[0006] An elastic washer made of elastic material is installed on the connecting nozzle, and the elastic washer is matched with the front end surface of the cutter end.

[0007] The spring washer is in a circular shape, and the front end surface of the cutter end is circular. When the cutter impacts forward, the circular edge hits the spring washer and is bounced backward.

[0008] The gap between the cutter cylinder and the housing clamp cavity is 0.01mm-0.05mm.

[0009] The nozzle is made of metal; the spring washer is engineering plastic, which ensures a certain elasticity and high temperature resistance; the film is made of stainless steel with a thickness of 0.4mm-0.8mm.

[0010] The igniter is installed at the rear end of the shell, where the spiral exhaust groove is located.

[0011] The beneficial effect of the present invention is that it avoids the use of non-metallic sealing structures such as rubber rings and gaskets, so that the electric explosion valve meets the sealing performance under various temperatures. The film on the cutter is broken by the impact of the igniter's detonation force. At the same time, the pressure of the gas cylinder itself is used to make the cutter stuck on the shell, and the electric explosion valve passage is fully opened. The electric explosion valve for opening gas cylinders of the present invention has a high degree of universality and is resistant to high and low temperatures, has a simple structure, and is economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 Schematic diagram of the shell structure.

[0014] Figure 3 Schematic diagram of the nozzle structure.

[0015] Figure 4 Schematic diagram of the spring washer structure.

[0016] Figure 5 It is a cross-sectional view of the cutter structure.

[0017] Figure 6 It is a three-dimensional schematic diagram of the cutter structure.

[0018] Figure 7 A three-dimensional schematic diagram of the cutter structure from another perspective.

[0019] Figure 8 Schematic diagram of the igniter structure.

[0020] Markings in the figure are: 1- nozzle, 2- spring washer, 3- cutter, 31- end, 32- cylinder, 33- film, 35- clamping surface, 4- shell, 41- cutter head cavity, 42- clamp cavity, 43- ignition cavity, 44- exhaust cavity, 45- inner cone, 5- igniter. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the electric explosion valve of the present invention includes a nozzle 1, a shell 4, a cutter 3, a spring pad 2 for providing elastic force, and an igniter 5 for providing power. The cutter 3 is installed in the shell 4, a nozzle 1 made of metal material is installed in front of the shell 4, the nozzle 1 is connected to the gas cylinder, and the igniter 5 is connected to the rear side of the shell 4.

[0023] The specific structure of the cutter 3 is as follows: Figures 5 to 7As shown, the cutter comprises a tip 31 and a cylinder 32. A film 33 is provided on the tip 31 for sealing the high-pressure gas in the high-pressure gas cylinder. The film 33 is welded to the nozzle 1 and the housing 4. The rear end of the cylinder 32 is kept a distance from the igniter 5. The diameter of the cutter tip is larger than the diameter of the cylinder, and the rear edge of the tip 31 is a tapered clamping surface 35. The cutter's function is to seal the gas in the cylinder before the igniter is activated. After the igniter is activated, the cutter breaks free from the film 33 at its front end to open the passage. The cutter then rebounds under the pressure of the cylinder and the elastic force of the spring pad 2, clamping onto the housing 4 to fully open the passage.

[0024] The spring pad 2 is installed in the inner cavity of the nozzle 1 and is made of elastic material. It is located in front of the cutter 3. The spring pad 2 is adapted to the front end surface of the end 31 of the cutter 3. The function of the spring pad is to provide elastic force to make the cutter rebound.

[0025] The function of the igniter is to provide high-pressure gas to push the cutter 3 to move quickly.

[0026] The shell 4 is the main body of the electric explosion valve, and the igniter 5 is installed to fix the cutter 3 in a position that does not affect the passage, while making the pressure inside and outside the igniter end of the electric explosion valve consistent and providing a cutter movement path. Figure 2 As shown, from front to back, the cutter head cavity 41, the clamp cavity 42 and the ignition cavity 43, the cutter head cavity 41 is downwardly the exhaust cavity 44, the end 31 of the cutter slides in the cutter head cavity 41 when the electric explosion valve starts, the cylinder 32 of the cutter 3 is clearance-matched with the clamp cavity 42, and the cutter head cavity 41 and the clamp cavity 42 of the housing 4 are connected with an inner conical surface 45, the inner conical surface 45 is adapted to the conical clamping surface 35 of the cutter end, and the angle of the inner conical surface 45 is smaller than the angle of the end clamping surface 35 by 1°-3°;

[0027] At the moment the electric explosion valve is opened, the high-pressure gas generated by the igniter 5 pushes the cutter 3 forward, the film 33 breaks, and the passage is opened. Under the action of the high-pressure gas in the high-pressure gas cylinder, and at the same time, because the cutter 3 impacts the spring pad 2 on the nozzle 1, the cutter 3 rebounds backward, and the conical clamping surface 35 of the cutter 3 is clamped on the inner conical surface 45 of the shell, fixing the cutter 3 and keeping the gas path unobstructed. The high-pressure gas in the high-pressure gas cylinder is released through the exhaust chamber 44. To ensure the clamping effect, the angle difference between the inner conical surface 45 of the shell and the clamping surface 35 of the cutter is preferably kept at 3°-5°, the inner conical surface 45 of the shell, 45-50, and the outer conical surface of the cutter 50-55. 3-5°

[0028] In order to make the high-pressure gas generated by the igniter 5 push the cutter 3 to slide forward, the gap between the column 32 and the clamp cavity 42 needs to be maintained at an appropriate value, 0.01mm-0.05mm, and the optimal gap is 0.04mm, which can ensure smooth sliding without excessive gas leakage.

[0029] Among them, the connection between the igniter 5 and the shell 4 is provided with a spiral exhaust groove, which is provided on the shell 4. After the igniter is detonated, the high-pressure gas generated by the igniter is discharged through the spiral groove, so that the pressure generated by the igniter in the electric explosion valve shell is reduced, and the gas pressure from the ignition chamber 43 to which the cutter 3 is subjected when it moves backward is reduced.

[0030] The electric explosion valve for opening a gas cylinder of the present invention utilizes a cutter and a film opening structure, and utilizes cylinder pressure and the spring force of a spring pad to provide kinetic energy, allowing the cutter to be clamped to the housing, ensuring an unobstructed gas passage. This avoids the use of non-metallic sealing structures such as rubber rings and gaskets, enabling the electric explosion valve to meet sealing requirements at various temperatures and providing high overall reliability. The electric explosion valve can operate in both high and low temperature environments, and has a simple structure and good economical efficiency. It is applicable to most gases in aerospace power plants, and has a wide applicable pressure range and strong versatility.

Claims

1. An electric explosion valve for opening a gas cylinder, comprising a three-way structure housing, a cutter installed in the housing, a nozzle installed in the front of the housing, the nozzle connected to the gas cylinder, and an igniter connected to the rear side of the housing, characterized in that: The cutter includes an end and a column. A film is provided on the end, which is welded to the connection between the nozzle and the shell. The rear end face of the column is kept at a distance from the igniter. The diameter of the cutter end is larger than the diameter of the column, and the rear edge of the end is a tapered clamping surface. The housing includes a cutter head cavity, a clamp cavity and an ignition cavity from front to back. The cutter head cavity is downwardly an exhaust cavity. The end of the cutter slides in the cutter head cavity. The column of the cutter is in clearance with the clamp cavity. An inner conical surface is provided at the junction of the cutter head cavity and the clamp cavity of the housing. The inner conical surface is adapted to the conical clamping surface of the cutter end. The angle of the inner conical surface is 1°-3° smaller than the angle of the clamping surface of the end. A spring washer made of elastic material is installed on the nozzle, which is adapted to the front end face of the cutter end; the spring washer is annular, and the front end face of the cutter end is circular. When the cutter impacts forward, the edge of the circle hits the spring washer and is bounced backward; the igniter is installed at the rear end of the shell, and an exhaust groove is provided at the connection between the shell and the igniter. The exhaust groove is spiral; the gap between the cutter cylinder and the shell clamp cavity is 0.01mm-0.05mm, and the film is made of stainless steel with a thickness of 0.4mm-0.8mm.

2. The electric explosion valve for opening a gas cylinder according to claim 1, characterized in that: The nozzle is made of metal material.

3. The electric explosion valve for opening a gas cylinder according to claim 1, characterized in that: The spring washer is made of engineering plastic.

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