One-way cylinder mouth valve suitable for hydrogen energy handheld torch

Abstract

The valve body (1), the valve core assembly (2), the spring (3), the spring cavity (4), and the seal ring (5) are provided. The spring cavity (1) is connected to the valve body (1). The valve core assembly (2) and the spring (3) are disposed in the spring cavity (4). The valve body (1) is provided with a valve body seal lip (1-1). The valve body seal lip (1-1) and the valve core assembly (2) are sealed by pressing a non-metallic material (2-2) to achieve a sealing pressure ratio. The spring (3) provides a seal for the valve core assembly (2). The outside of the valve body (1) is provided with a gas seal. A one-way cylinder mouth valve suitable for a hydrogen energy handheld torch is provided with a seal ring (5) for ensuring a seal between the cylinder and the valve body, a through hole (4-1) as a hydrogen inlet is provided in the spring cavity (4), and a hydrogen introduction hole and a central passage in the valve core are provided in the valve core assembly (2), and when the cylinder mouth valve is opened, the sealing force provided by the spring to the valve core assembly is resisted against the upward medium force received by the valve core assembly in a pressured state, and hydrogen passes through the hydrogen inlet, the spring cavity, the hydrogen introduction hole, and the central passage in the valve core to enter and flow out of the central through hole in the valve body, thereby realizing the discharge of hydrogen. This one-way cylinder mouth valve has the characteristics of reliable sealing, small size, and light weight, and also has a hydrogen filling function.

Description

[Technical field]

[0001] [Interaction of related applications] This application claims priority to a Chinese patent application filed with the China Patent Office on December 6, 2021, bearing application number 202111511584.5 and titled "One-way cylinder mouth valve suitable for hydrogen energy handheld torch", the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of valves, specifically to a one-way cylinder mouth valve applicable to hydrogen energy handheld torches. [Background technology]

[0003] The hydrogen energy handheld torch uses hydrogen stored in a gas cylinder as fuel, and the pressure of the gas cylinder can reach 70MPa G, so it is involved in opening and closing the gas cylinder with low torque and reliable sealing. Hydrogen has a small molecular weight and is more likely to diffuse than other gas fuels, so there are high requirements for the sealing performance of the components that control the opening and closing of the gas cylinder. Since the internal space of the hydrogen energy handheld torch is narrow and the total weight needs to be reduced, the cylinder mouth valve needs to be lightweight and compact.

[0004] Conventional gas cylinder valves cannot be directly applied to the gas cylinder of the hydrogen energy handheld torch due to their large size and weight. CN201059377Y discloses a removable normally closed valve, which ensures sealing by pressing the flat surface of the valve core against the sealing gasket. Under the conditions of high-pressure hydrogen use, if the size of the valve sealing structure is large, the valve core will receive a large medium force, so the valve opening force will be large, and it will be difficult for the torch runner to operate at the torch relay site. In addition, hydrogen has a small molecular weight, so it is difficult to seal it in the first place, and the processing of parts that adopt a large-sized sealing structure is difficult and the accuracy is poor. If the size of the valve sealing structure is small, the sealing gasket will be easily crushed, and the valve may lose its sealing performance. Therefore, a cylinder mouth valve suitable for high-pressure hydrogen medium is needed to meet the needs of hydrogen energy handheld torches. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem to be solved by the present invention is to provide a one-way cylinder mouth valve suitable for a hydrogen energy handheld torch, which has the characteristics of reliable sealing, small size and light weight, and also has a hydrogen filling function. [Means for solving the problem]

[0006] The technical solution of the present invention to solve the technical problem is a one-way cylinder mouth valve suitable for a hydrogen energy handheld torch, comprising a valve body, a valve core assembly, a spring, a spring cavity and a seal ring, the spring cavity is connected to the valve body, the valve core assembly and the spring are disposed in the spring cavity, the valve body is provided with a valve body seal lip, and the seal between the valve body seal lip and the valve core assembly is realized by pressing a non-metallic material to reach the sealing pressure ratio of the material, and the spring provides a sealing force for the valve core assembly, and the valve body is provided with a seal ring. a sealing ring is provided on the side to ensure a seal between the gas cylinder, the spring cavity is provided with a through hole as a hydrogen inlet, and the valve core assembly is provided with a hydrogen introduction hole and a central flow passage in the valve core; when the cylinder mouth valve is opened, the sealing force provided to the valve core assembly by the spring and the upward medium force received by the valve core assembly in a pressured state are resisted; hydrogen passes through the hydrogen inlet, the spring cavity, the hydrogen introduction hole, and the central flow passage in the valve core, and flows out into the central through hole in the valve body, thereby realizing the release of the hydrogen, in this one-way cylinder mouth valve suitable for a hydrogen energy handheld torch.

[0007] Preferably, the valve core assembly includes the valve core and a non-metallic structural member, the valve core comprises a central valve core, a bottom cylinder and a large-diameter structure between them for mounting the non-metallic structural member, the central valve core is provided with the valve core central passage along the axial direction, the side wall of the valve core central passage is provided with the hydrogen inlet hole, the bottom cylinder is used to mount one end of the spring, the mounting position of the non-metallic structural member corresponds to the position of the valve body seal lip, the force direction of the non-metallic structural member is different from the material deformation direction during sealing, and therefore it is suitable for hydrogen use conditions under different pressures.

[0008] Preferably, the non-metallic structural member is in the form of an insert or injection molded non-metallic material or an extruded seal ring.

[0009] Preferably, the force applied to the valve core assembly is perpendicular to the material deformation direction, and is suitable for hydrogen use conditions of less than 20 MPa G.

[0010] Preferably, the non-metallic structural member is an annular member, and if the cross-sectional shape of the annular member is rectangular, it is attached by insert molding and is suitable for hydrogen usage conditions of 10 MPa G or less, and if the cross-sectional shape of the annular member is an isosceles trapezoid, it is attached by injection molding and is suitable for hydrogen usage conditions of 20 MPa G or less.

[0011] Preferably, when the cross-sectional shape of the annular member is rectangular, polytetrafluoroethylene or nylon is selected as the non-metallic material, and when the cross-sectional shape of the annular member is an isosceles trapezoid, polyether ether ketone resin or polyimide is selected as the non-metallic material.

[0012] Preferably, the direction in which the valve core assembly receives force and the direction in which the material is deformed form a wide angle, and the valve core assembly is suitable for use under hydrogen conditions of less than 70 MPa G.

[0013] Preferably, the non-metallic structural member is a stepped annular member, and the surface except the stepped surface is wrapped and attached by the large diameter structure of the valve core assembly, the stepped surface wraps around the outer edge of the valve body seal lip at an envelope angle of 90° to ensure sealing in both radial and axial directions, and the valve body seal lip and the valve core assembly are provided with metal stoppers to prevent the valve body seal lip from crushing the non-metallic structural member in the axial position under high pressure conditions.

[0014] Preferably, the valve body seal lip is a cylindrical structure provided at one end of the central through hole of the valve body, and after the central valve core is inserted into the central through hole, there is a gap between the outer wall of the central valve core and the inner wall of the cylindrical structure.

[0015] The diameter d1 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is insert molded is in the range of 2 to 10 mm, preferably in the range of 2.5 to 8 mm, the diameter d2 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is injection molded is in the range of 2 to 8 mm, preferably in the range of 2.5 to 7 mm, and the diameter d3 of the valve body seal lip that fits with the valve core assembly into which the seal ring is extrusion molded is in the range of 2 to 5 mm, preferably in the range of 2.5 to 4 mm. Effect of the Invention

[0016] Compared with the prior art, the present invention has the following useful effects. The object of the present invention is to provide a one-way cylinder mouth valve suitable for a hydrogen energy handheld torch with hydrogen filling function, which has the characteristics of reliable sealing, small size and light weight, and specifically includes: 1. The one-way cylinder mouth valve in the present invention works in conjunction with the opening and closing member of the hydrogen energy handheld torch to implement the opening and closing command of the gas cylinder. 2. When the one-way cylinder mouth valve of the present invention is subjected to an opening force, the valve opens and hydrogen can flow in two directions, realizing the functions of hydrogen release and hydrogen filling. When the opening force is released, the valve core assembly automatically returns to its original position and the valve closes. 3. The size of the seal in the present invention is small, the medium force applied to the valve core assembly is small, and the valve opening force is small, which realizes the design of a compact and lightweight valve. 4. The valve core assembly in the present invention can use various structural forms, such as a form in which non-metallic materials are insert molded or injection molded, and a form in which the sealing ring is extrusion molded, and the specific form can be selected according to the operating pressure. 5. The valve core assembly with the seal ring extruded in the present invention uses a seal structure in which the soft part and the hard part are closely attached, the seal ring is closely attached to the outer edge of the metal seal lip with an enveloping angle of 90°, and the valve body seal lip and the valve core assembly are provided with metal stoppers, which prevents the valve body seal lip from crushing the seal ring under high pressure conditions, making it more suitable for sealing high pressure hydrogen. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic structural diagram of a one-way cylinder mouth valve of the present invention. [Diagram 2] 1A to 1C are schematic diagrams of the sealing principle of the valve core assembly under different use conditions. [Diagram 3] FIG. 1 is a schematic diagram of hydrogen flow when the one-way cylinder mouth valve is open. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention will be further described below in conjunction with examples.

[0019] The one-way cylinder mouth valve suitable for the hydrogen energy handheld torch proposed by the present invention will be described in more detail below in combination with the description of the drawings and specific embodiments.

[0020] As shown in Fig. 1, the present invention is structurally composed of a valve body 1, a valve core assembly 2, a spring 3, a spring cavity 4, and a seal ring 5. The valve core assembly 2 and the spring 3 are disposed in the spring cavity 4, the valve body 1 is connected to the spring cavity 4 by a female thread, the valve body 1 is connected to a gas cylinder by a male thread, and a seal ring 5 is provided on the outside of the valve body 1 to ensure a seal between the valve and the gas cylinder. The valve core assembly 2 and the spring 3 are disposed in the spring cavity 4, the valve body 1 is connected to the spring cavity 4 by a female thread, the valve body 1 is connected to a gas cylinder by a male thread, and a seal ring 5 is provided on the outside of the valve body 1 to ensure a seal between the valve and the gas cylinder, and has a hydrogen filling function. The one-way cylinder mouth valve is arranged according to different operating pressures, with different valve core assembly structures including a form in which non-metallic materials are insert-molded or injection-molded, or a form in which a sealing ring is extruded. The valve core assembly in which non-metallic materials are insert-molded or injection-molded has a force direction perpendicular to the material deformation direction, and is suitable for hydrogen operating conditions of less than 20 MPa G. The valve core assembly in which a sealing ring is extruded has a force direction and a wide angle with the material deformation direction, and is suitable for hydrogen operating conditions of 70 MPa G.

[0021] As shown in FIG. 1, the valve body 1 has a female thread used to connect the valve body 1 to the spring cavity 4, a male thread used to connect the one-way cylinder mouth valve to the gas cylinder, and a seal ring 5 to ensure the seal between the valve and the gas cylinder is provided on the outside. The upper end of the internal cavity of the valve body is provided with an annular seal lip 1-1, which is the sealing surface of the valve body 1. The spring 3 is mounted in the spring cavity 4, and its spring force provides a sealing force to the valve core assembly 2, and further, since the valve core assembly 2 receives an upward medium force under pressure, the seal of the high-pressure hydrogen is ensured. The valve core assembly 2 has various forms, such as a form in which a non-metallic material is insert-molded or injection-molded, and a form in which a seal ring is extrusion-molded, and specifically, it can be selected according to the operating pressure.

[0022] The one-way cylinder mouth valve is provided with the characteristics of reliable sealing, small size and light weight by arranging different valve core assembly structures according to different working pressures, and is also provided with hydrogen filling function, meeting the needs of the gas cylinder of the hydrogen energy handheld torch. Figures 2a to 2c show different forms of the valve core assembly 2, and are provided with a gas guide hole 2-1. Figure 2a shows a form in which a nonmetallic material is insert molded, and the nonmetallic material can be selected from polytetrafluoroethylene, nylon, etc., which is suitable for a working pressure of 10 MPa. Figure 2b shows a form in which a nonmetallic material is injection molded, and the nonmetallic material can be selected from polyether ether ketone resin, polyimide, etc., which is suitable for a working pressure of 20 MPa. Figure 2c shows a form in which a sealing ring is extruded, and is suitable for a working pressure of 70 MPa. The sealing principle of the valve core assembly in the form of Fig. 2a, 2b is that the sealing lip 1-1 of the valve body presses the non-metallic material 2-2 of the valve core assembly vertically until the sealing pressure ratio of the material is reached to realize the sealing, and this two-valve core assembly structure is provided with a small sealing structure, the pressure from the medium received is small, and the valve opening force is small. The diameter d1 of the valve body sealing lip that matches the valve core assembly in which the non-metallic material is insert molded is in the range of 2-10mm, preferably 2.5-8mm, the diameter d2 of the valve body sealing lip that matches the valve core assembly in which the non-metallic material is injection molded is in the range of 2-8mm, preferably 2.5-7mm, and the diameter d3 of the valve body sealing lip that matches the valve core assembly in which the seal ring is extrusion molded is in the range of 2-5mm, preferably 2.5-4mm.

[0023] Figure 2c shows a valve core assembly in which the seal ring is extruded, and the seal structure is made by closely contacting the soft part and the hard part. The sealing principle of the valve core assembly in Figure 2c is that the seal ring 2-3 wraps around the outer edge of the valve body seal lip 1-1 at an enveloping angle of 90° to ensure sealing in two directions, namely, radial and axial directions, and the metal stopper 2-4 is installed on the valve body seal lip and the valve core assembly to avoid the valve body seal lip 1-1 from crushing the axial position of the seal ring 2-3 under high pressure conditions. This type of valve core assembly structure can still use a small seal structure size d3, the range of d3 is 2-5mm, preferably 2.5-4mm, and the medium pressure is high, but the force from the medium received by the valve core assembly is small, so that the opening and closing force of the cylinder mouth valve is small, which is suitable for the use needs of high pressure and low opening force.

[0024] As shown in Figure 3, when the one-way cylinder mouth valve receives a downward opening force, the valve core assembly 2 generates a downward displacement against the medium force and the spring force, hydrogen passes through the spring cavity 4 and the valve core assembly flow passage in sequence to realize the hydrogen release function, and when the valve is open, hydrogen flows in the reverse direction to realize the hydrogen filling function. As shown in Figure 1, when the opening force is released, the valve core assembly 2 automatically returns to its original position due to the upward force from the medium and the spring force, and the valve closes.

[0025] As shown in Figure 1, the spring 3 is installed in the spring cavity 4 to provide a sealing force for the valve core assembly, which is insert-molded or injection-molded with non-metallic materials. As shown in Figure 1, the spring cavity 4 is connected to the valve body 1 by a screw, the valve core assembly 2, the spring 3 are placed in the spring cavity 4, and the lower end of the spring cavity 4 is provided with a through hole 4-1, which is the inlet of the cylinder mouth valve.

[0026] The above shows and describes the basic principle, main features and advantages of the present invention. The present invention is not limited by the above embodiments, and the above embodiments and the description in the specification are merely the principles of the present invention, and various changes and improvements are possible without departing from the spirit and scope of the present invention, and all of these changes and improvements are included in the protection scope of the present invention. The protection scope of the present invention is defined by the appended claims and their equivalents. [Explanation of symbols]

[0027] 1 Valve body 2 Valve Core Assembly 3. Spring 4 Spring Cavity 5 Seal ring

Claims

1. A one-way cylinder mouth valve suitable for a hydrogen energy handheld torch, comprising: Includes a valve body, a valve core assembly, a spring, a spring cavity, and a seal ring. a spring cavity connected to the valve body, the valve core assembly and the spring being disposed in the spring cavity, the valve body being provided with a valve body seal lip, a seal between the valve body seal lip and the valve core assembly being realized by pressing a non-metallic material to reach a sealing pressure ratio of the material, and the spring providing a sealing force to the valve core assembly, a seal ring being provided on the outside of the valve body to ensure a seal between the valve body and a gas cylinder, a through hole being provided in the spring cavity as a hydrogen inlet, a hydrogen inlet hole and a central valve core passage being provided in the valve core assembly, an external force required to open the cylinder mouth valve must resist the sealing force provided by the spring to the valve core assembly and the upward medium force received by the valve core assembly under pressure, and hydrogen passes through the hydrogen inlet, the spring cavity, the hydrogen inlet hole and the central valve core passage to enter and flow out of the central through hole of the valve body, thereby realizing the release of hydrogen.

2. 2. The one-way cylinder mouth valve of claim 1, wherein the valve core assembly includes the valve core and a non-metallic structural member, the valve core comprises a central valve core, a bottom cylinder, and a large-diameter structure between them for mounting the non-metallic structural member, the central valve core is provided with the valve core central passage along the axial direction, the side wall of the valve core central passage is provided with the hydrogen inlet hole, the bottom cylinder is used to mount one end of the spring, the mounting position of the non-metallic structural member corresponds to the position of the valve body seal lip, and the force direction of the non-metallic structural member is different from the material deformation direction during sealing, making it suitable for hydrogen use conditions under different pressures.

3. 3. The one-way cylinder mouth valve of claim 2, wherein the non-metallic structural member is in the form of an insert or injection molded non-metallic material, or an extruded sealing ring.

4. The one-way cylinder mouth valve according to claim 2, characterized in that the direction in which the valve core assembly receives force is perpendicular to the direction of deformation of the material, and the one-way cylinder mouth valve is suitable for hydrogen use conditions of less than 20 MPa G.

5. The one-way cylinder mouth valve of claim 3, characterized in that the non-metallic structural member is an annular member, and when the cross-sectional shape of the annular member is rectangular, it is attached by insert molding and is suitable for hydrogen use conditions of 10 MPa G or less, and when the cross-sectional shape of the annular member is an isosceles trapezoid, it is attached by injection molding and is suitable for hydrogen use conditions of 20 MPa G or less.

6. The one-way cylinder mouth valve according to claim 5, characterized in that when the cross-sectional shape of the annular member is rectangular, polytetrafluoroethylene or nylon is selected as the non-metallic material, and when the cross-sectional shape of the annular member is an isosceles trapezoid, polyether ether ketone resin or polyimide is selected as the non-metallic material.

7. 3. The one-way cylinder mouth valve according to claim 2, wherein the direction in which the valve core assembly receives force and the direction in which the material is deformed form a wide angle, and the one-way cylinder mouth valve is suitable for hydrogen use conditions of less than 70 MPaG.

8. The one-way cylinder mouth valve according to claim 7, characterized in that the non-metallic structural member is a stepped annular member, the surface except for the stepped surface is wrapped and attached by the large-diameter structure of the valve core assembly, the stepped surface wraps around the outer edge of the valve body seal lip at an enveloping angle of 90° to ensure sealing in both radial and axial directions, and the valve body seal lip and the valve core assembly are provided with metal stoppers to prevent the valve body seal lip from crushing the non-metallic structural member in the axial position under high pressure conditions.

9. 3. The one-way cylinder mouth valve as claimed in claim 2, characterized in that the valve body sealing lip is a cylindrical structure provided at one end of the central through hole of the valve body, and after the central valve core is inserted into the central through hole, there is a gap between the outer wall of the central valve core and the inner wall of the cylindrical structure.

10. The one-way cylinder mouth valve according to claim 5, characterized in that a diameter d1 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is insert molded is in the range of 2 to 10 mm, a diameter d2 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is injection molded is in the range of 2 to 8 mm, and a diameter d3 of the valve body seal lip that fits with the valve core assembly into which the seal ring is extrusion molded is in the range of 2 to 5 mm.

11. The one-way cylinder mouth valve according to claim 10, characterized in that a diameter d1 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is insert molded is in the range of 2.5 to 8 mm, a diameter d2 of the valve body seal lip that fits with the valve core assembly into which the non-metallic material is injection molded is in the range of 2.5 to 7 mm, and a diameter d3 of the valve body seal lip that fits with the valve core assembly into which the seal ring is extruded is in the range of 2.5 to 4 mm.

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