Lightweight, reduced pressure hydrogen supply unit suitable for hydrogen energy handheld torches

Abstract

A lightweight reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch includes a cylinder mouth valve (3), a pressure reducing valve (4), an opening / closing assembly (5), an opening / closing execution member, and a gas cylinder cap (8). The pressure reducing valve (4) has three connection ports: a lower connection port (4-1) connected to the gas cylinder cap (8), an upper connection port (4-2) connected to the burner (2), and a side connection port (4-3) for mounting the opening / closing assembly (5). The opening / closing execution member and the cylinder mouth valve (3) are attached inside the gas cylinder cap (8). The opening / closing assembly (5) controls the opening / closing execution member to realize the opening and closing of the cylinder mouth valve (3). The cylinder mouth valve (3) is connected to the cylinder mouth of the gas cylinder (1) and is used to open and close the gas cylinder. This lightweight reduced pressure hydrogen supply device is used to open and close gas cylinders, reduce pressure of high pressure hydrogen, and seal hydrogen by connecting the gas cylinder and burner in series in a hydrogen energy handheld torch combustion system. It solves problems such as large pressure reduction ratio pressure reduction, highly reliable sealing, and low opening and closing torque, and has advantages such as a wide temperature range, small size, and light weight.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application filed with the China Patent Office on December 6, 2021, bearing application number 202111481514.X and entitled "Lightweight reduced pressure hydrogen supply device 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, and more particularly to a lightweight, reduced pressure hydrogen supply device suitable for hydrogen energy handheld torches. [Background technology]

[0003] In various large-scale competitions, handheld torches are often used for the torch relay, and since the torch relay is held outdoors, the external environment has a significant impact on the burning of the torch. At present, the fuel for the torches used at home and abroad is mainly propane, and the propane liquid is vaporized in the gas cylinder, and the propane gas is provided to the burner. During use, there are problems such as poor resistance to low temperatures, wind resistance, and rain resistance, so the torch fire is easily extinguished.

[0004] With China proposing the gradual goal of carbon peaking and carbon neutrality, hydrogen, whose only combustion product is water, is the cleanest energy today and one of the clean energies with the greatest development potential in the 21st century. Hydrogen burns quickly, is difficult to extinguish once ignited, and has good wind and rain resistance. The critical temperature of hydrogen is -198°C, so hydrogen only exists as a gas at room temperature. Hydrogen burns directly after being released from the gas cylinder and reaches the burner, which is more suitable for low temperature environments. Therefore, hydrogen, as a torch fuel, can better solve the problems existing in traditional torches, while conveying science and technology, green spiritual connotations to the audience.

[0005] Since hydrogen only exists as a gas at room temperature, in order to ensure a certain burning time, the amount of hydrogen used can only be met within the limited volume of the gas cylinder by increasing the storage pressure, which can reach 70MPa G, far exceeding that of conventional torches. The molecular weight of hydrogen is very small, so a more reliable seal is required, and the handheld torch has strict requirements for the size and weight of each part, so a lightweight reduced pressure hydrogen supply device suitable for hydrogen energy handheld torches is needed. The lightweight reduced pressure hydrogen supply device connects the gas cylinder and the burner in series in the torch combustion system, opens the gas cylinder to release the high-pressure hydrogen, then reduces the pressure, and provides a constant flow rate of hydrogen and the required pressure for the burner, solving problems such as large reduction ratio reduction, high-precision pressure stabilization, highly reliable seal, and low opening and closing torque, and has the advantages of being small and lightweight. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem to be solved by the present invention is to provide a lightweight reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch in order to overcome the shortcomings of the prior art. [Means for solving the problem]

[0007] The technical solution of the present invention is a lightweight reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch, for connecting a gas cylinder and a burner in the torch, comprising a cylinder mouth valve, a pressure reducing valve, an opening and closing assembly, an opening and closing execution member, and a gas cylinder cap; The pressure reducing valve is used to reduce the pressure of high-pressure hydrogen and has three connection ports: a lower connection port connected to a gas cylinder cap, an upper connection port connected to a burner, and a side connection port for attaching an opening / closing assembly. An opening / closing execution member and a cylinder mouth valve are attached to the gas cylinder cap, and the opening / closing assembly controls the opening / closing execution member to open and close the cylinder mouth valve. The cylinder mouth valve is connected to the cylinder mouth of the gas cylinder and is used to open and close the gas cylinder.

[0008] Preferably, the opening / closing assembly comprises a cam, a gasket, and a pressure nut; The cam is attached to the side connection port of the pressure reducing valve and is divided into four parts sequentially along the axis of the connection port, the outermost part is connected to the side connection port by a pressing nut and the pressing nut presses the gasket and the outermost part, a groove is provided in the second part adjacent to the outermost part and a cam opening / closing position regulating structure is installed in the groove to prevent the valve from automatically closing, the third part is a cam convex surface whose position corresponds to the opening / closing execution member and the cam convex surface changes the opening and closing method of the cylinder mouth valve from linear to rotation, the second and fourth parts are provided with seal rings, and the double seal ring structure offsets the axial force applied to the cam, a key slot is provided on the end face of the outermost part and the key slot provides the driving force for rotating the cam.

[0009] Preferably, the position of the opening / closing position regulating structure is such that, when the cam is rotated in one direction, the cam convex surface presses down on the ejector pin, opening the cylinder mouth valve, and when the cam is rotated in the other direction, the cam convex surface disengages from the ejector pin, closing the cylinder mouth valve; and the position regulating structure realises position regulation of the rotation in the above two directions by contact between the opening / closing position regulating structure and the two end faces of the groove.

[0010] Preferably, in the process of opening the cylinder mouth valve, the tip of the cam convex surface rotates to the lowest point and then continues to move until it reaches a position where the open position is restricted, with the tip of the cam convex surface forming a small included angle β with the vertical direction, the range of said β being 3° to 18°, and preferably 5° to 10°.

[0011] Preferably, the opening / closing member includes an ejector pin and a spring. The ejector pin is a stepped cylindrical structure with a spherical upper surface, and is disposed in the central through-hole of the gas cylinder cap, the spherical surface contacts the cam convex surface, the bottom surface of the ejector pin contacts the cylinder mouth valve to provide thrust for opening, and a spring is mounted in compression within the stepped surface of the ejector pin and the stepped surface of the central through-hole.

[0012] Preferably, the pressure reducing valve comprises a valve body, a piston assembly, a valve cover and a spring, a cylinder is provided at the upper end of the valve body, a step is provided at the outer bottom of the cylinder, the spring is compressed and attached to the step, a small end of the piston assembly is attached inside the cylinder and a large end is attached to the internal cavity of the valve cover, the valve body is provided with a first pressure reducing structure communicating with the cylinder, a high pressure chamber communicating with a valve inlet is provided below the first pressure reducing structure, the valve cover is provided with a second pressure reducing structure communicating with a valve outlet, the piston assembly is provided with a double seal structure which connects the piston assembly, the valve cover and the valve body to form a low pressure chamber of the pressure reducer, the second pressure reducing structure communicates with the low pressure chamber, an upper connection port is provided at the valve outlet, and a lower connection port and a side connection port communicating with the high pressure chamber are provided at the valve inlet.

[0013] Preferably, the second pressure reduction structure is a throat hole with a noise reduction structure, and the noise reduction structure is a plurality of noise reduction passages arranged above and below the throat hole for reducing noise generated by the high-speed flow of gas, and the noise reduction passages include a throat hole passage located above the throat hole and having a diameter d4, and a throat hole passage located below the throat hole and having a diameter d3, and a funnel-structured passage is provided between the two throat hole passages and the throat hole of the noise reduction structure, and the diameter of the small end of the upper funnel-structured passage is the same as the throat hole diameter, and the diameter of the small end of the lower funnel-structured passage is d3.

[0014] Preferably, the diameter ratio d3 / d2 of the throat hole passage in the noise reduction passage to the second-stage pressure reduction structure is 1.1 to 2.4, preferably 1.3 to 1.8, and d4 / d2 is 1.5 to 3.2, preferably 1.7 to 2.6.

[0015] Preferably, the diameter ratio d1 / d2 between the first pressure reduction structure and the second pressure reduction structure is 1.1 to 2, and more preferably 1.4 to 1.7.

[0016] Preferably, the piston assembly is composed of four stepped cylindrical surfaces whose diameters increase successively from the small end, the end face of the cylindrical surface at the smallest end is fitted with a non-metallic material to protect the first-stage pressure reduction structure, guide holes are provided from the periphery of the side toward the center, converge to the center and communicate with the guide hole at the central axis and also communicate with the inner hole at the large end, and seal rings are provided on the outside of the cylindrical surface at the largest end and the outside of the cylindrical surface with the second smallest diameter, thereby realizing a sealed connection with the internal cavity of the valve cover and the cylinder of the valve body, respectively.

[0017] Preferably, the diameter ratio D1 / D2 between the cylinder at the largest end and the cylinder with the second smallest diameter is 2 to 2.8, and more preferably 2.2 to 2.5.

[0018] Preferably, the cylinder mouth valve is a cylinder mouth valve 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, and 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 a seal is realized between the valve body seal lip and the valve core assembly by pressing a non-metallic material to reach the sealing pressure ratio of the material, and the spring provides a sealing force to the valve core assembly. A seal ring is provided on the outside of the valve body to ensure a seal between the gas cylinder and the valve body. The spring cavity is provided with a through hole as a hydrogen inlet, and the valve core assembly is provided with a hydrogen inlet and a central valve passage. 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 under pressure, and hydrogen passes through the hydrogen inlet, the spring cavity, the hydrogen inlet and the central valve passage to enter and flow out of the central through hole of the valve body, thereby realizing the release of hydrogen.

[0019] Preferably, the valve core assembly includes a valve core and a non-metallic structural member, the valve core includes 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 a central flow passage along the axial direction, the side wall of the central flow passage of the valve core is provided with a hydrogen inlet hole, the bottom cylinder is used to mount one end of a 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, so that it is suitable for hydrogen use conditions under different pressures.

[0020] 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 use conditions of 10 MPa G or less; if 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; the direction in which the force of the valve core assembly is received and the deformation direction of the material form a wide angle, and it is suitable for hydrogen use conditions of less than 70 MPa G.

[0021] Preferably, the non-metallic structural member is a stepped annular member, and the surface other than 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 a metal stopper to prevent the valve body seal lip from crushing the non-metallic structural member in the axial position under high pressure conditions.

[0022] Preferably, the diameter d1 of the valve body seal lip that is compatible with the valve core assembly in 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 is compatible with the valve core assembly in 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 is compatible with the valve core assembly in 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.

[0023] Preferably, the reduced pressure hydrogen supply device has an applicable pressure of 1 MPa G to 70 MPa G, an operating temperature of -40°C to 60°C, a weight of less than 230 g, an axial size of less than 180 mm, and a radial size of less than 60 mm. Effect of the Invention

[0024] The present invention provides the following useful advantages over the prior art. 1. The pressure reducing valve in the present invention reduces the pressure of the released high-pressure hydrogen and stabilizes the pressure before supplying it to the burner. Through the connection port and lug of the pressure reducing valve, the opening and closing assembly and fixing mechanism of the reduced pressure hydrogen supply device are integrated into the pressure reducing valve. 2. The cam in this invention is equipped with a double seal, and the axial force of the cam is offset through the force balance principle. Furthermore, the gasket made of low-friction material is used, which effectively reduces the opening and closing torque of the cylinder mouth valve, and the opening and closing torque is less than 4 N·m. 3. The opening / closing position control structure (screw) and the arc-shaped groove of the cam in this invention form a mechanical opening / closing position control mechanism for the device, which controls the rotation angle of the cam, ensures that the cylinder mouth valve opens and closes to a specified position, and prevents the valve from closing automatically. 4. In the present invention, a gas guide hole is provided in the ejector pin, and the high-pressure hydrogen is released from the cylinder mouth valve and then enters the pressure reducing valve through the gas guide hole in the ejector pin. 5. In the present invention, the gas cylinder cap connects the gas cylinder and the pressure reducing valve together, the ejector pin and the small spring are disposed in the gas cylinder cap, and the cylinder mouth valve is attached to the gas cylinder mouth, so that the gas cylinder cap connects the cylinder mouth valve, the pressure reducing valve and the opening and closing parts to form a lightweight pressure reducing hydrogen supply device. 6. In the present invention, the lightweight reduced pressure hydrogen supply device is used to integrally connect the gas cylinder and the burner in the torch combustion system, and to open and close the gas cylinder, reduce the pressure of high pressure hydrogen, and seal hydrogen. It solves the problems of pressure reduction at a large pressure reduction ratio, highly reliable sealing, low opening and closing torque, and has the advantages of a wide temperature range, small size, and light weight. The applicable pressure of the device is 1Mpa G to 70Mpa G, the working temperature is -40℃ to 60℃, the weight is less than 230g, the axial size is less than 180mm, and the radial size is less than 60mm. 7. The cylinder mouth valve of the present invention has the characteristics of reliable sealing, small size and light weight, and also has a hydrogen filling function. 8. The single spring high pressure reducer of the present invention is composed of only four metal components, with a simple structure, precise and compact components, and a lightweight and compact design of the valve. The single spring high pressure reducer of the present invention has reliable performance, only one moving part, is not easily broken, and is highly reliable. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic structural diagram of a lightweight reduced pressure hydrogen supply device of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing the balance of forces in the closure assembly of the present invention. [Figure 3-1] FIG. 13 is a schematic diagram showing the relationship between the opening / closing assembly in the fully closed position of the present invention and the ejector pin position. [Figure 3-2] FIG. 13 is a schematic diagram showing the relationship between the opening / closing assembly of the present invention in a fully open position and the ejector pin position. [Figure 4] FIG. 2 is a schematic diagram showing the flow of hydrogen through an ejector pin of the present invention. [Diagram 5] FIG. 2 is a schematic structural diagram of the cylinder mouth valve of the present invention. [Figure 6] 1A-1D are schematic diagrams illustrating the sealing principle of the valve core assembly under different working conditions. [Figure 7] FIG. 2 is a schematic diagram showing hydrogen flow when the one-way cylinder mouth valve is open. [Figure 8] FIG. 2 is a schematic structural diagram of a single spring high pressure reducer according to the present invention; [Figure 9] FIG. 2 is a schematic cross-sectional view of a piston assembly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The present invention will be further described below in conjunction with examples.

[0027] The following detailed description of the present invention will be given in conjunction with the drawings and specific embodiments to describe the lightweight reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch.

[0028] As shown in FIG. 1, the lightweight reduced pressure hydrogen supply device connects a gas cylinder 1 and a burner 2 in a torch combustion system together, and includes a cylinder mouth valve 3, a pressure reducing valve 4, an opening / closing assembly 5, a small spring 6, an ejector pin 7, and a gas cylinder cap 8.

[0029] As shown in FIG. 1, the cylinder mouth valve 3 is attached to the cylinder mouth of the gas cylinder 1 and is used for opening and closing the gas cylinder 1. The cylinder mouth valve 3 is screwed onto the gas cylinder 1 and is provided with a seal ring.

[0030] As shown in Fig. 1, the pressure reducing valve 4 is provided with three ports, the lower port 4-1 is screwed with the gas cylinder cap 11 and provided with a sealing ring, the upper port 4-2 is screwed with the burner 2 and provided with a sealing gasket, and the side port 4-3 is provided with an opening and closing assembly 5. The pressure reducing valve 4 is further provided with two lugs 4-4, the lug angle α can be changed according to actual use, and the lightweight pressure reducing hydrogen supply device is fixed by tightening the screws, and the opening and closing assembly of the device and the fixing mechanism are integrated together through the pressure reducing valve.

[0031] The opening and closing assembly includes a cam 5-1, a gasket 5-2, a pressing nut 5-3, and a screw 5-4. The pressing nut 5-3 is screwed into the side connection port 4-3 of the pressure reducing valve to press the gasket 5-2 and the cam 5-1. As shown in FIG. 2, the cam is attached to the side connection port of the pressure reducing valve and is divided into four parts along the axis of the connection port. The outermost part 5-1 realizes the connection with the side connection port by the pressing nut 5-3, and the pressing nut presses the gasket 5-2 and the outermost part. A groove 5-13 is provided in the second part adjacent to the outermost part, and the screw 5-4 is attached in the groove to form a cam opening and closing position regulating structure and prevent the valve from closing automatically. The third part is a cam convex surface 5-11, the position of which corresponds to the opening and closing execution member, the cam convex surface changes the opening and closing method of the cylinder mouth valve from linear to rotation, the second part and the fourth part are provided with a seal ring 5-14, the axial force applied to the cam is offset by the double seal ring structure, and the end face of the outermost part is provided with a key slot 5-12, which provides the driving force for the cam rotation. When the cam is rotated counterclockwise, the cam convex surface 5-11 pushes down the ejector pin 7 to open the cylinder mouth valve 3, and when the cam 5-1 is rotated clockwise, the cam convex surface 5-11 disengages from the ejector pin 7 to close the cylinder mouth valve 3.

[0032] As shown in FIG. 3-1, the screw 5-4 is attached to the screw hole of the side connection port 4-3 of the pressure reducing valve, and the screw 5-4 is located in the cam groove 5-13, forming an opening / closing mechanical position restriction mechanism of the device, and the cam 5-1 can only rotate within the range of the groove 5-13.

[0033] As shown in Fig. 3-1, the screw 5-4 is in close contact with one end of the cam groove 5-13, and the position is restricted to the closed position. When the cam is rotated counterclockwise, the cylinder mouth valve 3 opens, and the tip of the cam convex surface 5-11 continues to move even after rotating to the lowest point until the tip of the convex surface and the vertical direction form a small included angle β, the range of β is 3° to 18°, and preferably 5° to 10°, and the screw 5-4 is in close contact with the other end of the cam groove 5-13, and the cam cannot rotate counterclockwise any further, and the position is restricted to the open position. As shown in FIG. 3-2, the opening force of the cylinder mouth valve 3 is an action force exerted by the cam on the ejector pin 7, and at the same time, the ejector pin 7 exerts a reaction force on the cam, which is applied to the cam convex surface 5-11. When in the fully open position, the reaction force causes the cam to rotate counterclockwise, and the position restriction mechanism for the open position can restrict the rotation of the cam, preventing the valve from automatically closing due to the reaction force.

[0034] As shown in Figure 2, the cam 5-1 is provided with a double seal ring 5-14, the size of the double seal rings of the cams is the same, and according to the force balance principle, the axial forces F1 and F2 in both directions of the cam are offset, and the gasket 5-2 uses a low-friction material to reduce the friction force during the cam rotation. By offsetting the axial force of the cam, and the gasket 5-2 with a low friction coefficient, the opening and closing torque of the cylinder mouth valve 3 is effectively reduced, and the opening and closing torque is less than 4 N·m.

[0035] 4, the small spring 6 is mounted on the annular step 8-1 of the gas cylinder cap, the ejector pin 7 is disposed within the small spring, and the high-pressure hydrogen is released from the cylinder mouth valve 3 and then passes through the gas guide hole 7-1 of the ejector pin into the pressure reducing valve 4. Both ends of the gas cylinder cap 8 are provided with threads for screwing into the gas cylinder 1 and the pressure reducing valve 4, respectively.

[0036] As shown in FIG. 4, the small spring 6 is mounted on an annular step of the gas cylinder cap 8, and the ejector pin 7 is disposed within the small spring 6. The ejector pin is provided with a gas guide hole. After the high-pressure hydrogen is released from the cylinder mouth valve 3, it enters the pressure reducing valve 4 through the gas guide hole 7-1 of the ejector pin.

[0037] As shown in Fig. 1, the gas cylinder cap 8 is screwed onto the gas cylinder 1 and the pressure reducing valve 4 respectively, connecting the gas cylinder 1 and the pressure reducing valve 4 together, and a sealing ring is provided to ensure sealing. A small spring 6 and an ejector pin 7 are attached to the gas cylinder cap 8, and the cylinder mouth valve 3 is attached to the gas cylinder 1, so that the gas cylinder cap 8 connects the cylinder mouth valve 3, the pressure reducing valve 4, the opening and closing assembly 5, the small spring 6 and the ejector pin 7 together, and the lightweight pressure reducing hydrogen supply device has a compact two-stage structure in appearance, providing a suitable valve solution for the hydrogen energy handheld torch.

[0038] The pressure reducing valve 4 is connected to the gas cylinder cap 8 at the bottom, connected to the burner 2 at the top, and equipped with the opening and closing assembly 5 on the side, so that the opening and closing assembly 5 and the fixing mechanism 4-4 of the lightweight pressure reducing hydrogen supply device are integrated into one. The device of the present invention has a compact two-stage structure, with the pressure reducing valve 4 at the top and the gas cylinder cap 8 at the bottom, and the remaining components are built-in. This provides a suitable valve solution for the hydrogen energy handheld torch.

[0039] In the lightweight reduced pressure hydrogen supply device, appropriate materials are selected for each component. The cylinder mouth valve 3 and the opening and closing assembly 5 are made of high-strength steel, the gasket 5-2 is made of low-friction material, the pressure reducing valve 4 and the gas cylinder cap 8 are made of low-density metal material, and the sealing ring is made of a material with a wide range of applicable temperatures, that is, it meets the strength, sealing, and temperature requirements as well as weight and size. The applicable pressure of the device is 1Mpa G to 70Mpa G, the operating temperature is -40℃ to 60℃, the weight is less than 230g, the axial size is less than 180mm, and the radial size is less than 60mm. The lightweight reduced pressure hydrogen supply device suitable for the hydrogen energy handheld torch mentioned above connects the gas cylinder and the burner in the hydrogen energy handheld torch combustion system to solve the problems of large pressure reduction ratio pressure reduction, high reliability sealing, low opening and closing torque, and has the advantages of wide temperature range, small size, and light weight.

[0040] In the present invention, the cylinder mouth valve and the pressure reducing valve can use products capable of realizing the above-mentioned functions in the prior art, and the present invention provides preferred and unique realization modes, which will be described below.

[0041] 1. Cylinder mouth valve As shown in Fig. 5, the present invention is a one-way cylinder mouth valve, which 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 the outside of the valve body 1 is provided with a seal ring 5 to ensure the 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 the outside of the valve body 1 is provided with a seal ring 5 to ensure the 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.

[0042] As shown in FIG. 5, the valve body 1 has a female thread used to connect the valve body 1 and the spring cavity 4, a male thread used to connect the one-way cylinder mouth valve and the gas cylinder, and a seal ring 5 is provided on the outside to ensure the seal between the valve and the gas cylinder. 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 when pressure is applied, 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.

[0043] 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 6a to 6c are different forms of the valve core assembly 2, and a gas guide hole 2-1 is provided. Figure 6a is a form in which a nonmetallic material is insert molded, and the nonmetallic material can be selected from polytetrafluoroethylene, nylon, etc., and is suitable for a working pressure of 10 MPa. Figure 6b is a form in which a nonmetallic material is injection molded, and the nonmetallic material can be selected from polyether ether ketone resin, polyimide, etc., and is suitable for a working pressure of 20 MPa. Figure 6c is a form in which a sealing ring is extrusion molded, and is suitable for a working pressure of 70 MPa. The sealing principle of the valve core assembly in the form of Figure 6a, 6b 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 seal, 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.

[0044] Figure 6c 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 6c 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 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.

[0045] As shown in Figure 7, 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.

[0046] As shown in Figure 5, the spring 3 is mounted in the spring cavity 4 to provide a sealing force for the valve core assembly, which is made of non-metallic material by insert molding or injection molding. As shown in Figure 1, the spring cavity 4 and the valve body 1 are screwed together, the valve core assembly 2 and 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.

[0047] Second, pressure reducing valve As shown in Figures 8 and 9, the single spring high pressure reducer of the present invention comprises a valve body 1, a piston assembly 2, a valve cover 3 and a spring 4. The spring 4 is attached to a step at the upper end of the valve body 1, the small end of the piston assembly 2 is attached in the cylinder 1-1 at the upper end of the valve body, the valve body 1 is screwed into the valve cover 3, the large end of the piston assembly 2 is located in the valve cover 3, and the piston assembly 2 is provided with a double seal ring to ensure sealing.

[0048] A cylinder 1-1 is provided at the upper end of the valve body, and a throat hole 1-2 is provided at the bottom of the cylinder 1-1. This constitutes the first-stage pressure reduction structure of the valve. Below the first-stage pressure reduction structure is a high-pressure chamber, and the pressure in the high-pressure chamber is the same as the pressure at the valve inlet.

[0049] The piston assembly 2 is provided with a double seal ring 2-1 on the outside and a gas guide hole 2-2 on the inside. The piston assembly 2 is composed of a piston 2-3 and a non-metallic material 2-4 fitted into its small end face. The piston is composed of four stepped cylindrical surfaces with increasing diameters, and a non-metallic material is fitted into the end face of the cylindrical surface at the smallest end, which is used to protect the first stage pressure reduction structure 1-2 of the valve body to avoid mechanical damage. The piston is provided with a guide hole from the side to the center, which converges to the center and communicates with the guide hole in the central axis and communicates with the inner hole at the large end, and a seal ring is provided on the outside of the cylindrical surface at the largest end and the outside of the cylindrical surface with the second smallest diameter, that is, the double seal ring 2-1 connects the piston assembly, the valve cover, and the valve body to form the low pressure chamber of the pressure reducer. In the structure in Figure 8, only its important parts are shown, and the three connection ports are not shown. Here, an upper connection port is provided at the outlet of the valve, and a lower connection port and a side connection port communicating with the high pressure chamber are provided at the inlet of the valve.

[0050] The top of the valve cover 3 is provided with a throat hole 3-1, which is the second-stage pressure reduction structure of the pressure reducer. Between the first-stage pressure reduction structure 1-2 and the second-stage pressure reduction structure 3-1 is a low-pressure chamber. The pressure in the low-pressure chamber is related to the spring force, the sensing area of ​​the piston assembly 2, and the second-stage pressure reduction structure 3-1. The pressure after the second-stage pressure reduction structure 3-1 is the outlet pressure. A plurality of noise reduction passages are provided above and below the second-stage pressure reduction structure 3-1. In FIG. 1, the first-stage noise reduction passages 3-21 and 3-22 are respectively provided above and below the second-stage pressure reduction structure 3-1. The passages gradually shrink to 3-21 and 3-22 at a certain angle, and then gradually expand at a certain angle. A plurality of noise reduction passages can be provided above and below the second-stage pressure reduction structure as required. The noise reduction passages and the second-stage pressure reduction structure can be formed by screwing or welding, which can effectively reduce the noise generated by the high-speed flow of gas. The diameter ratio d3 / d2 between the lower noise reduction flow passage of the second stage pressure reduction structure and the second stage pressure reduction structure is 1.1-2.4, preferably 1.3-1.8, and the diameter ratio d4 / d2 between the upper noise reduction flow passage of the second stage pressure reduction structure and the second stage pressure reduction structure is 1.5-3.2, preferably 1.7-2.6. By providing a plurality of side holes 3-3 in the valve cover 3, the mounting space of the spring 4 is communicated with the outside, which avoids the change in air pressure in the space caused by the movement of the spring from affecting the pressure reduction performance, and effectively reduces the total weight of the valve. The valve body 1 and the valve cover 3 are pressure comparison members of the pressure reducer, and by providing a two-stage pressure reduction structure, the pressure of the high pressure chamber, the low pressure chamber and the outlet can be appropriately distributed, and the diameter d1 / d2 of the two-stage pressure reduction throat hole is in the range of 1.1-2, preferably 1.4-1.7. The pressure of the low pressure chamber is directly related to the spring force, the size of the second stage pressure reduction structure and the sensing area of ​​the piston assembly. The sensing area of ​​the piston assembly is mainly determined by the diameter D1. The range of D1 / D2 is 2 to 2.8, preferably 2.2 to 2.5.

[0051] The valve body 1 and the valve cover 3 are pressure comparison members of the pressure reducer, and constitute a two-stage pressure reduction structure, with the diameter ratio d1 / d2 between the first and second stage pressure reduction structures being 1.1-2, preferably 1.4-1.7, and the pressure reducer outputs the required outlet pressure and hydrogen flow rate after appropriately distributing the pressures of the high pressure chamber, the low pressure chamber and the outlet. The d1 and d2 sizes of the pressure reduction structure are both larger than the size of the valve port using the one-stage pressure reduction structure, making it easier to process and improving the processing accuracy.

[0052] The spring 4 is attached to the step surface 1-3 at the upper end of the valve body, and its upper end is in close contact with the bottom 2-5 of the large end of the piston assembly. The spring force is balanced with the medium force acting on the sensing area of ​​the piston assembly 2, the inlet and outlet directions of the valve are coaxial with the direction of movement of the spring, the radial size of the valve is small, and the installation space of the valve is reduced.

[0053] The operating principle of the present invention is as follows. When high-pressure hydrogen enters the high-pressure chamber of the valve, the piston assembly and the first-stage pressure reducing structure are in a disengaged state, so the hydrogen flows out through the first and second-stage pressure reducing structures in sequence. Because the size of the first-stage pressure reducing structure is larger than that of the second-stage pressure reducing structure, the pressure in the low-pressure chamber gradually increases with the inflow of high-pressure gas, and the piston assembly moves downwards, receiving the downward medium force of the low-pressure chamber and resisting the upward spring force, until the resultant force is balanced. At this time, the output pressure of the pressure reducer is reached and a certain flow rate of hydrogen is provided to the burner.

[0054] 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 contents described in the specification are merely the principles of the present invention. The present invention can be modified and improved in various ways without departing from the spirit and scope of the present invention, and such modifications and improvements are included in the protection scope of the present invention. The protection scope of the invention is defined by the appended claims and their equivalents.

[0055] The parts not described in detail in the present specification are common knowledge to those skilled in the art.

Claims

1. A lightweight, reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch for connecting a gas cylinder and a burner in the torch, comprising a cylinder mouth valve, a pressure reducing valve, an opening / closing assembly, an opening / closing execution member, and a gas cylinder cap; The pressure reducing valve is used to reduce the pressure of high pressure hydrogen, and has three connection ports, namely, a lower connection port connected to a gas cylinder cap, an upper connection port connected to a burner, and a side connection port for attaching an opening / closing assembly, and an opening / closing execution member and a cylinder mouth valve are attached in the gas cylinder cap, and the opening / closing assembly realizes opening and closing of the cylinder mouth valve by controlling the opening / closing execution member, and the cylinder mouth valve is connected to the cylinder mouth of the gas cylinder, and is used to open and close the gas cylinder. A lightweight, reduced pressure hydrogen supply device suitable for a hydrogen energy handheld torch.

2. the opening / closing assembly includes a cam, a gasket, and a pressure nut; the cam is attached to the side connection port of the pressure reducing valve and is divided into four parts sequentially along the axis of the connection port, the outermost part is connected to the side connection port by a pressing nut, and the pressing nut presses the gasket and the outermost part, the second part adjacent to the outermost part is provided with a groove, and a cam opening / closing position regulating structure is installed in the groove to prevent the valve from automatically closing, the third part is a cam convex surface, the position of which corresponds to the opening / closing execution member, the cam convex surface changes the opening and closing method of the cylinder mouth valve from linear to rotation, the second part and the fourth part are provided with seal rings, and the axial force applied to the cam is offset by the double seal ring structure, the end face of the outermost part is provided with a key slot, and the key slot provides the driving force for the cam rotation.

2. The reduced pressure hydrogen supply device according to claim 1 .

3. The position of the opening / closing position regulating structure is such that, when the cam is rotated in one direction, the cam convex surface presses down the ejector pin, opening the cylinder mouth valve, and when the cam is rotated in the other direction, the cam convex surface disengages from the ejector pin, closing the cylinder mouth valve. The position regulating structure realizes the position regulation of the rotation in the above two directions by contacting the opening / closing position regulating structure with the two end faces of the groove.

3. The reduced pressure hydrogen supply device according to claim 2.

4. During the process of opening the cylinder mouth valve, the tip of the cam convex surface rotates to the lowest point, and then continues to move until it reaches the open position restriction position with the tip of the cam convex surface and the vertical direction forming a small included angle β, the range of said β is 3° to 18°, and preferably 5° to 10°.

4. The reduced pressure hydrogen supply device according to claim 3.

5. The opening / closing member includes an ejector pin and a spring. The ejector pin is a stepped cylindrical structure with a spherical upper surface, and is disposed in the central through hole of the gas cylinder cap, the spherical surface contacts the cam convex surface, and the bottom surface of the ejector pin contacts the cylinder mouth valve to provide a thrust for opening, and a spring is mounted in compression within the stepped surface of the ejector pin and the stepped surface of the central through hole.

3. The reduced pressure hydrogen supply device according to claim 2.

6. the pressure reducing valve comprises a valve body, a piston assembly, a valve cover and a spring, a cylinder is provided at an upper end of the valve body, a step is provided at an outer bottom of the cylinder, the spring is mounted in compression on the step, the piston assembly has a small end mounted within the cylinder and a large end mounted in an internal cavity of the valve cover, the valve body is provided with a first pressure reducing structure communicating with the cylinder, a high pressure chamber communicating with a valve inlet is provided below the first pressure reducing structure, the valve cover is provided with a second pressure reducing structure communicating with a valve outlet, the piston assembly is provided with a double seal structure, the double seal structure connects the piston assembly, the valve cover and the valve body to form a low pressure chamber of the pressure reducer, the second pressure reducing structure communicates with the low pressure chamber, an upper connection port is provided at the valve outlet, and a lower connection port and a side connection port communicating with the high pressure chamber are provided at the valve inlet.

2. The reduced pressure hydrogen supply device according to claim 1 .

7. The second pressure reduction structure is a throat hole with a noise reduction structure, and the noise reduction structure is a plurality of noise reduction passages provided above and below the throat hole for reducing noise generated by high-speed gas flow, and the noise reduction passages include a throat hole passage located above the throat hole and having a diameter of d4, and a throat hole passage located below the throat hole and having a diameter of d3, and a funnel-structured passage is provided between each of the two throat hole passages and the throat hole of the noise reduction structure, and the diameter of the small end of the upper funnel-structured passage is the same as the throat hole diameter, and the diameter of the small end of the lower funnel-structured passage is d3.

7. The reduced pressure hydrogen supply device according to claim 6.

8. The diameter ratio d3 / d2 of the throat hole flow passage in the noise reduction flow passage to the second-stage pressure reduction structure is 1.1 to 2.4, preferably 1.3 to 1.8, and d4 / d2 is 1.5 to 3.2, preferably 1.7 to 2.

6. If necessary, a plurality of noise reduction flow passages are provided above and below the second-stage pressure reduction structure.

8. The reduced pressure hydrogen supply device according to claim 7.

9. The diameter ratio d1 / d2 of the first pressure reduction structure and the second pressure reduction structure is 1.1 to 2, preferably 1.4 to 1.

7.

8. The reduced pressure hydrogen supply device according to claim 7.

10. The piston assembly is composed of four stepped cylindrical surfaces whose diameters increase from the small end, the end face of the cylindrical surface at the smallest end is fitted with a non-metallic material to protect the first stage pressure reduction structure, guide holes are provided from the periphery of the side toward the center, converge to the center and communicate with the guide hole at the central axis and communicate with the inner hole at the large end, and seal rings are provided on the outside of the cylindrical surface at the largest end and the outside of the cylindrical surface with the second smallest diameter, thereby realizing a seal connection with the internal cavity of the valve cover and the cylinder of the valve body, respectively.

7. The reduced pressure hydrogen supply device according to claim 6.

11. The diameter ratio D1 / D2 between the largest diameter cylinder and the second smallest diameter cylinder is 2 to 2.8, preferably 2.2 to 2.

5. The reduced pressure hydrogen supply device according to claim 10.

12. The cylinder mouth valve includes 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, and 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 to the valve core assembly. The valve body is provided with a seal ring on the outside to ensure sealing between the gas cylinder and the valve body. The spring cavity is provided with a through hole as a hydrogen inlet, and the valve core assembly is provided with a hydrogen inlet and a central valve passage. 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 under pressure, and hydrogen passes through the hydrogen inlet, the spring cavity, the hydrogen inlet and the central valve passage to enter and flow out of the central through hole of the valve body, thereby realizing the release of hydrogen.

2. The reduced pressure hydrogen supply device according to claim 1 .

13. The valve core assembly includes a valve core and a non-metallic structural member, the valve core has 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 has a central flow passage along the axial direction, the side wall of the central flow passage of the valve core has a hydrogen inlet hole, the bottom cylinder is used to mount one end of a 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, so that it is suitable for hydrogen use conditions under different pressures.

13. The reduced pressure hydrogen supply device according to claim 12.

14. The non-metallic structural member is an annular member, and when the cross-sectional shape of the annular member is a rectangle, it is attached by insert molding and is suitable for hydrogen use conditions of 10 MPa G or less; 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; the direction in which the force of the valve core assembly is received and the deformation direction of the material form a wide angle, and it is suitable for hydrogen use conditions of less than 70 MPa G; The reduced pressure hydrogen supply device according to claim 13.

15. The non-metallic structural member is a stepped annular member, and the surface other than the stepped surface is wrapped and attached by the large diameter structure of the valve core assembly, and 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 a metal stopper to prevent the valve body seal lip from crushing the non-metallic structural member in the axial position under high pressure conditions.

15. The reduced pressure hydrogen supply device according to claim 14.

16. The diameter d1 of the valve body seal lip that is compatible with the valve core assembly in 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 is compatible with the valve core assembly in 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 is compatible with the valve core assembly in 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.

15. The reduced pressure hydrogen supply device according to claim 14.

17. The device has an application pressure of 1 MPa G to 70 MPa G, an operating temperature of -40°C to 60°C, a weight of less than 230 g, an axial size of less than 180 mm, and a radial size of less than 60 mm. The reduced pressure hydrogen supply device according to any one of claims 1 to 16.

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