A low-pressure two-stage pressure reducing valve

Abstract

The present invention provides a low-pressure two-stage pressure reducing valve, which includes a valve body, a valve cover, an air charging connector, a valve stem nut assembly, and an air outlet connector, wherein the valve body has an air inlet connected to the outside, the upper end of the valve body is connected to the lower end of the valve cover, the valve stem nut assembly and the air outlet connector are both connected to the valve cover, and the air charging connector is connected to the valve body. The pressure reducing valve is equipped with a valve stem nut assembly, an air outlet connector, and a piston, and the air inlet, the fourth matching chamber, the second connecting channel, the fifth matching chamber, the second matching chamber, the first connecting channel, the third matching chamber, and the air outlet are connected in sequence inside the pressure reducing valve. The valve stem position is changed by rotating the switch knob to achieve a pressure control effect. The pressure reducing valve has a novel, compact, and easy-to-operate structure. The pressure reducing valve can achieve a good sealing effect and improve safety.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure reducing valves, in particular to a low-pressure two-stage pressure reducing valve. Background Art

[0002] Hydrogen energy is an environmentally friendly, efficient, clean and renewable energy. In recent years, with the advancement of medicine, hydrogen molecular medicine has developed rapidly, and its benefits to human health are attracting more widespread attention, exploration and application.

[0003] The practical application of hydrogen products is a key development direction for the future hydrogen health industry. The benefits of hydrogen inhalation include antioxidant benefits, therapeutic effects on oxidative damage and abnormal symptoms such as apoptosis in various diseases, and effective sleep improvement. Regular hydrogen breathing can also assist in the treatment of cerebral vascular damage, with some therapeutic effects on ischemic and hypoxic brain damage caused by neonatal asphyxia. However, this is only possible when the hydrogen flow rate is 100-200 mL / minute and the hydrogen output pressure is below 1 atmosphere.

[0004] In the prior art, it is difficult for a small-sized low-pressure pressure reducing valve to achieve precise control of hydrogen pressure reduction.

[0005] Therefore, based on the above technical problems, technicians in this field urgently need to develop a new low-pressure two-stage pressure reducing valve. Summary of the Invention

[0006] The object of the present invention is to provide a low-pressure two-stage pressure reducing valve, which is used for a hydrogen health ventilator. The pressure reducing valve realizes two-stage pressure reduction and has a novel and compact structure and is easy to operate.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A low-pressure two-stage pressure reducing valve, which includes a valve body, a valve cover, an inflation joint, a valve stem nut assembly and an air outlet joint, wherein the valve body has an air inlet connected to the outside, the upper end of the valve body is connected to the lower end of the valve cover, the valve stem nut assembly and the air outlet joint are both connected to the valve cover, and the inflation joint is connected to the valve body.

[0009] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, an inflation port is also provided at the lower end of the valve body, one end of the inflation connector is placed in the valve body, and the other end of the inflation connector is located outside the valve body, and the inflation connector and the valve body are connected by a tapered thread; an inflation core is installed inside the inflation connector, and the inflation core limits the gas to flow only from the outside of the inflation connector to the inflation port; a first matching cavity is formed between the valve body and the inflation connector, and the inflation port is connected to the first matching cavity.

[0010] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the inflation joint is axially provided with an inflation pipe, the inflation joint is provided with a first groove, the inflation pipe and the first groove are connected, and the diameter of the first groove is larger than the aperture of the inflation pipe; the inflation core includes an air core seat and an air core rod, the air core seat is located in the first groove, one end of the air core rod is connected to the air core seat, and the other end of the air core rod is located in the inflation pipe, the inflation core can move axially along the inflation pipe, and the air core rod is sleeved with a first sealing ring, and the first sealing ring can seal between the air core seat and the inflation joint.

[0011] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the air inlet is located at the lower end of the valve body, the air inlet is connected to the air outlet end of the external gas cylinder, the lower end of the valve body has a threaded structure connected to the external gas cylinder, the upper end of the valve body has a threaded structure connected to the valve cover, and the upper end of the threaded structure located at the lower end of the valve body is provided with a second sealing ring, which is used to seal between the valve body and the external gas cylinder.

[0012] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the valve cover has a first threaded hole and a second threaded hole, and the first threaded hole and the second threaded hole are relatively arranged on the side wall of the valve cover, the valve stem nut assembly is connected to the valve cover through the first threaded hole, and the air outlet joint is connected to the valve cover through the second threaded hole; the lower end of the valve cover has a threaded structure connected to the valve body, and the valve cover and the valve body are threadedly connected; preferably, a set screw is provided on the side wall of the valve cover, and the set screw contacts the upper end of the valve body after passing through the valve cover, and tightening the set screw can fix the axial position between the valve cover and the valve body.

[0013] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the valve stem nut assembly includes a valve stem and a nut, one end of the valve stem is placed in the valve cover, and the other end of the valve stem is located outside the valve cover, and the nut fixes the valve stem to the valve cover; a first sealing gasket is embedded in one end of the valve stem, and a switch knob is installed at the other end of the valve stem, and the switch knob can drive the valve stem to rotate to adjust the relative position of the valve stem and the valve cover, and a second annular groove is provided on the outer periphery near one end of the valve stem, and a third sealing ring is provided in the second groove; A second mating cavity is formed between one end of the valve stem and the valve cover, a third mating cavity is formed between the air outlet joint and the valve cover, a first connecting channel is provided in the valve cover, the second mating cavity and the third mating cavity are communicated with each other through the first connecting channel, the switch knob can drive the valve stem to move toward the outside of the valve cover to open the first connecting channel; and the switch knob can drive the valve stem to move toward the inside of the valve cover and make the first sealing gasket tightly fit with the sealing surface of the first connecting channel to close the first connecting channel.

[0014] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the air outlet connector is threadedly connected to the valve cover, one end of the air outlet connector is placed inside the valve cover, and the other end of the air outlet connector is located outside the valve cover. The air outlet connector is provided with an air outlet hole, and the air outlet hole is connected to the third matching cavity. The blocking screw blocks the air outlet hole when the air outlet connector is not in use.

[0015] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, a piston is provided between the valve body and the valve cover, a second sealing gasket is embedded in the lower end of the piston, the interior of the piston is hollow, and the piston is composed of an upper section and a lower section, both of which are cylindrical structures, the outer diameter of the upper section is larger than the outer diameter of the lower section, and the vertical cross-section of the internal hollow part of the upper section is an inverted frustum structure, the upper end of the upper section is the large end of the frustum, and the lower end of the upper section is the small end of the frustum; a second sealing gasket is formed between the lower end of the piston and the valve body. Four matching cavities, a second connecting channel is provided in the valve body, the fourth matching cavity is connected with the air inlet through the second connecting channel, a fifth matching cavity is formed between the upper end of the piston and the valve cover, and the fifth matching cavity is connected with the second matching cavity; the axis of the valve cover and the axis of the valve body are located on the same straight line, and the piston can move along the axial direction of the valve cover; the piston moves toward the valve body to close the second connecting channel, and the piston moves away from the valve body to open the second connecting channel.

[0016] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, a first accommodating groove is provided in the lower end of the valve cover, and a second accommodating groove is provided in the upper end of the valve body, the upper end of the piston is placed in the first accommodating groove, and the lower end of the piston is placed in the second accommodating groove; a spring is sleeved on the upper outer side of the lower section of the piston, and one end of the spring is in contact with the lower outer surface of the upper section of the piston; a third accommodating groove is also provided on the periphery of the second accommodating groove, the bottom of the third accommodating groove is higher than the bottom of the second accommodating groove, and the other end of the spring is in contact with the bottom of the third accommodating groove.

[0017] Furthermore, in the above-mentioned low-pressure two-stage pressure reducing valve, the outer diameter of the upper section is equal to the inner diameter of the first accommodating groove, the outer wall of the upper section is provided with a third annular groove, and a fourth sealing ring is provided in the third groove. The outer diameter of the lower section is equal to the inner diameter of the second accommodating groove, the outer wall of the lower section is provided with a fourth annular groove, and a fifth sealing ring is provided in the fourth groove. A filter is attached to the upper end of the piston, and the filter is used for preliminary filtration of the discharged gas; preferably, the pressure reducing valve limits the gas flow rate to 100~200mL / minute and the gas output pressure to below 0.1MPa.

[0018] Analysis shows that the present invention discloses a low-pressure two-stage pressure reducing valve, which is equipped with a valve stem nut assembly, an air outlet joint and a piston. At the same time, the air inlet, the fourth matching chamber, the second connecting channel, the fifth matching chamber, the second matching chamber, the first connecting channel, the third matching chamber and the air outlet are sequentially connected inside the pressure reducing valve. The valve stem position is changed by rotating the switch knob to achieve the effect of controlling the pressure. The pressure reducing valve has a novel, compact and easy-to-operate structure. The pressure reducing valve is provided with a second sealing ring on the valve body, a fourth sealing ring and a fifth sealing ring on the piston, and a third sealing ring on the valve stem, which can achieve a good sealing effect and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0020] Figure 1 An exploded view of the three-dimensional structure of an embodiment of the present invention.

[0021] Figure 2 A schematic cross-sectional view of an embodiment of the present invention.

[0022] Figure 3 for Figure 2 Schematic diagram of the right side cross-sectional structure.

[0023] Explanation of reference numerals: 1 valve body; 101 air inlet; 102 charging port; 103 second sealing ring; 104 first matching cavity; 105 fourth matching cavity; 106 second accommodating groove; 107 third accommodating groove; 2 charging connector; 201 charging core; 202 first sealing ring; 203 gas core seat; 204 gas core rod; 205 charging pipe; 206 first groove; 3 valve cover; 301 fastening screw; 302 second matching cavity; 303 third matching cavity; 304 third A threaded hole; 305 a second threaded hole; 306 a first connecting channel; 307 a first accommodating groove; 4 a valve stem; 401 a third sealing ring; 402 a first sealing gasket; 5 a nut; 6 a switch knob; 7 an air outlet connector; 701 a plugging screw; 8 a piston; 801 a fourth sealing ring; 802 a fifth sealing ring; 803 a filter screen; 804 a spring; 805 a second connecting channel; 806 a fifth matching chamber; 807 an upper section; 808 a lower section; 809 a second sealing gasket. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0025] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and the description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first," "second," and "third," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.

[0027] like Figures 1 to 3 As shown, according to an embodiment of the present invention, a low-pressure two-stage pressure reducing valve is provided, which is used for a hydrogen health ventilator. The pressure reducing valve is installed on an external gas cylinder, as shown in FIG. Figure 1 As shown, the pressure reducing valve includes a valve body 1, a valve cover 3, an inflation connector 2, a valve stem nut assembly and an air outlet connector 7, wherein the valve body 1 has an air inlet 101 connected to the outside, the upper end of the valve body 1 is connected to the lower end of the valve cover 3, the valve stem nut assembly and the air outlet connector 7 are both connected to the valve cover 3, and the inflation connector 2 is connected to the valve body 1.

[0028] Furthermore, if Figure 3 As shown, the lower end of the valve body 1 is also provided with a charging port 102, which is connected to the gas outlet of the external gas cylinder. One end of the charging connector 2 is placed inside the valve body 1, and the other end of the charging connector 2 is located outside the valve body 1. The charging connector 2 is partially embedded in the valve body 1, and the charging connector 2 and the valve body 1 are connected by a tapered thread. The charging core 201 is installed inside the charging connector 2, and the charging core 201 restricts gas from flowing from the outside of the charging connector 2 to the charging port 102. A first mating cavity 104 is formed between the valve body 1 and the charging connector 2, and the charging port 102 is connected to the first mating cavity 104. The charging connector 2 is used to replenish hydrogen to the external gas cylinder.

[0029] Furthermore, if Figure 3 As shown, the inflation joint 2 is axially provided with an inflation pipe 205, and the end of the inflation joint 2 connected to the valve body 1 is provided with a first groove 206, the inflation pipe 205 and the first groove 206 are connected, and the diameter of the first groove 206 is larger than the aperture of the inflation pipe 205; the inflation core 201 includes an air core seat 203 and an air core rod 204, the air core seat 203 is located in the first groove 206, one end of the air core rod 204 is connected to the air core seat 203, and the other end of the air core rod 204 is located in the inflation pipe 205, the inflation core 201 can move along the axial direction of the inflation pipe 205, and the air core rod 204 is sleeved with a first sealing ring 202, and the first sealing ring 202 can seal between the air core seat 203 and the inflation joint 2. When no external hydrogen is input to the charging connector 2, the charging core 201 moves toward the other end of the charging connector 2 under the pressure of the hydrogen in the first mating cavity 104, causing the charging core seat 203 to press tightly against the charging connector 2, restricting the outflow of hydrogen through the seal of the first sealing ring 202. When the pressure of the hydrogen input to the charging connector 2 exceeds the pressure of the hydrogen in the external gas cylinder, the charging core 201 moves toward the valve body 1, and hydrogen is input into the external gas cylinder through the gap between the charging connector 2 and the charging core 201, thus replenishing the external gas cylinder with hydrogen.

[0030] Furthermore, an air inlet 101 is located at the lower end of the valve body 1 and communicates with the outlet of an external gas cylinder. The lower end of the valve body 1 has a threaded structure for connecting to the external gas cylinder, while the upper end of the valve body 1 has a threaded structure for connecting to the valve cover 3. This arrangement facilitates maintenance of the pressure reducing valve. A second sealing ring 103 is mounted on the upper end of the threaded structure at the lower end of the valve body 1. This second sealing ring 103 is used to seal between the valve body 1 and the external gas cylinder, preventing hydrogen leakage.

[0031] Furthermore, if Figure 1 As shown, the valve cover 3 has a first threaded hole 304 and a second threaded hole 305, and the first threaded hole 304 and the second threaded hole 305 are relatively arranged on the side wall of the valve cover 3, the valve stem nut assembly is connected to the valve cover 3 through the first threaded hole 304, and the air outlet joint 7 is connected to the valve cover 3 through the second threaded hole 305; the lower end of the valve cover 3 has a threaded structure connected to the valve body 1, and the valve cover 3 and the valve body 1 are threadedly connected; preferably, a set screw 301 is provided on the side wall of the valve cover 3, and the set screw 301 contacts the upper end of the valve body 1 after passing through the valve cover 3. Tightening the set screw 301 can fix the axial position between the valve cover 3 and the valve body 1. The setting of the set screw 301 can prevent the connection between the valve body 1 and the valve cover 3 from loosening.

[0032] Furthermore, if Figure 2As shown, the valve stem nut assembly includes a valve stem 4 and a nut 5. The nut 5 is sleeved on the valve stem 4. The nut 5 and the valve stem 4 are threadedly connected. One end of the valve stem 4 is placed in the valve cover 3, and the other end of the valve stem 4 is located outside the valve cover 3. The valve stem 4 is partially embedded in the valve cover 3, and the valve stem 4 partially extends to the outside of the valve cover 3. The outer periphery of the nut 5 is provided with an external thread. The nut 5 is threadedly connected to the valve cover 3 through the external thread on the outer periphery. The threaded connection between the nut 5 and the valve cover 3 has an anti-loosening effect; one end of the valve stem 4 (the end of the valve stem 4 embedded in the valve cover 3) is embedded with a first sealing gasket 402, and the other end of the valve stem 4 (the end of the valve stem 4 extending to the outside of the valve cover 3) is installed with a switch The knob 6 is rotated to rotate the valve stem 4 to adjust the relative position of the valve stem 4 and the valve cover 3. A second annular groove is provided on the outer circumference near one end of the valve stem 4. A third sealing ring 401 is disposed within the second groove, sealing the valve stem 4 and the valve cover 3. A second mating cavity 302 is formed between one end of the valve stem 4 and the valve cover 3, and a third mating cavity 303 is formed between the outlet connector 7 and the valve cover 3. A first connecting channel 306 is provided within the valve cover 3. The second mating cavity 302 and the third mating cavity 303 are connected through the first connecting channel 306, and the axis of the first connecting channel 306 is perpendicular to the axis of the valve cover 3. Rotating the knob 6 moves the valve stem 4 toward the outside of the valve cover 3 to open the first connecting channel 306. Rotating the knob 6 also moves the valve stem 4 toward the inside of the valve cover 3, causing the first sealing gasket 402 to tightly fit the sealing surface of the first connecting channel 306 to close the first connecting channel 306. By rotating the switch knob 6, the relative position of the valve stem 4 and the valve cover 3 is adjusted, thereby adjusting the opening between the first sealing gasket 402 and the first connecting channel 306, thereby controlling the output hydrogen flow rate and achieving the pressure relief function. The arrangement of the valve stem nut assembly not only achieves the pressure control effect, but also makes the pressure relief valve novel, compact, and easy to operate.

[0033] Furthermore, the air outlet connector 7 is threadedly connected to the valve cover 3, one end of the air outlet connector 7 is placed inside the valve cover 3, and the other end of the air outlet connector 7 is located outside the valve cover 3. The air outlet connector 7 is partially embedded in the valve cover 3, and the air outlet connector 7 partially extends to the outside of the valve cover 3. The air outlet connector 7 is provided with an air outlet hole, which is connected to the third mating cavity 303. The blocking screw 701 blocks the air outlet hole when the air outlet connector 7 is not in use.

[0034] Furthermore, if Figure 3As shown, a piston 8 is provided between the valve body 1 and the valve cover 3, and a second sealing gasket 809 is embedded at the lower end of the piston 8. The interior of the piston 8 is hollow, and the cavity inside the piston 8 is a gas channel for hydrogen to flow through the piston 8. The piston 8 consists of an upper section 807 and a lower section 808. Both the upper section 807 and the lower section 808 are cylindrical structures. The outer diameter of the upper section 807 is larger than the outer diameter of the lower section 808. The vertical cross-section of the inner hollow part of the upper section 807 is an inverted frustum structure, that is, the upper end of the upper section 807 It is the large end of the cone, and the lower end of the upper section 807 is the small end of the cone; a fourth matching chamber 105 is formed between the lower end of the piston 8 and the valve body 1, and a second connecting channel 805 is provided in the valve body 1. The fourth matching chamber 105 is connected to the air inlet 101 of the valve body 1 through the second connecting channel 805, and the axis of the second connecting channel 805 is perpendicular to the axis of the first connecting channel 306. A fifth matching chamber 806 is formed between the upper end of the piston 8 and the valve cover 3, and the fifth matching chamber 806 is connected to the second matching chamber 302; the axis of the valve cover 3 and the axis of the valve body 1 are located on the same straight line, and the piston 8 can move along the axial direction of the valve cover 3; the piston 8 moves toward the valve body 1 and makes the second sealing gasket 809 fit tightly with the sealing surface of the second connecting channel 805, so as to close the second connecting channel 805, and the piston 8 moves away from the valve body 1 to open the second connecting channel 805. The movement of piston 8 adjusts the opening between second sealing gasket 809 and second connecting channel 805, thereby controlling the flow rate of the output hydrogen and achieving a pressure reduction function. Because the axis of second connecting channel 805 is perpendicular to the axis of first connecting channel 306, the hydrogen pressure is adjusted as it flows through first connecting channel 306 and second connecting channel 805.

[0035] Furthermore, a first accommodating groove 307 is provided in the lower end of the valve cover 3, and a second accommodating groove 106 is provided in the upper end of the valve body 1. The upper end of the piston 8 is positioned in the first accommodating groove 307, and the lower end of the piston 8 is positioned in the second accommodating groove 106. A spring 804 is sleeved around the upper outer side of the lower section 808 of the piston 8, with one end of the spring 804 contacting the lower outer surface of the upper section 807 of the piston 8. A third accommodating groove 107 is also provided around the periphery of the second accommodating groove 106. The bottom of the third accommodating groove 107 is higher than the bottom of the second accommodating groove 106, and the other end of the spring 804 contacts the bottom of the third accommodating groove 107. When the gas pressure in the fifth mating chamber 806 exceeds the elastic force of the spring 804, the piston 8 moves downward along the axis of the valve cover 3, causing the second sealing gasket 809 to approach the second connecting channel 805. When the gas pressure in the fifth matching chamber 806 is less than the elastic force of the spring 804 , the piston 8 moves upward along the axis of the valve cover 3 under the elastic force of the spring 804 , so that the second sealing gasket 809 moves away from the second connecting channel 805 .

[0036] Furthermore, if Figure 3As shown, the outer diameter of the upper section 807 is equal to the inner diameter of the first accommodating groove 307. The outer wall of the upper section 807 is provided with an annular third groove, and the third groove is provided with a fourth sealing ring 801. The fourth sealing ring 801 can seal between the piston 8 and the valve cover 3. The outer diameter of the lower section 808 is equal to the inner diameter of the second accommodating groove 106. The outer wall of the lower section 808 is provided with an annular fourth groove, and the fourth groove is provided with a fifth sealing ring 802. The fifth sealing ring 802 can seal between the piston 8 and the valve body 1. Preferably, a filter 803 is attached to the upper end of the piston 8, and the filter 803 is used to preliminarily filter the discharged hydrogen gas.

[0037] This pressure reducing valve achieves two-stage pressure reduction. Its internal design sequentially connects the air inlet 101, fourth mating cavity 105, second connecting channel 805, fifth mating cavity 806, second mating cavity 302, first connecting channel 306, third mating cavity 303, and an air outlet. When hydrogen flows through the fourth mating cavity 105, second connecting channel 805, and fifth mating cavity 806, the piston 8 adjusts the opening of the second connecting channel 805 to achieve first-stage pressure reduction. When hydrogen flows through the second mating cavity 302, first connecting channel 306, and third mating cavity 303, the valve stem nut assembly adjusts the opening of the first connecting channel 306 to achieve second-stage pressure reduction. This two-stage pressure reducing valve limits the hydrogen flow rate to 100-200 mL / min and the hydrogen output pressure to below 0.1 MPa.

[0038] The principle of the pressure reducing valve to achieve two-stage pressure reduction is: by rotating the switch knob 6, the position of the first sealing gasket 402 at one end of the valve stem 4 is adjusted relative to the first connecting channel 306, and then the size of the opening between the first sealing gasket 402 and the first connecting channel 306 is adjusted, or the first sealing gasket 402 blocks the first connecting channel 306 to close the first connecting channel 306.

[0039] As the valve stem nut assembly adjusts the size of the opening between the first sealing gasket 402 and the first connecting channel 306, the hydrogen pressure in the second matching chamber 302 changes accordingly. At the same time, the hydrogen pressure in the fifth matching chamber 806 connected to the second matching chamber 302 changes accordingly. When the hydrogen pressure in the fifth matching chamber 806 is greater than the elastic force of the spring 804, the piston 8 moves toward the valve body 1 under the action of the hydrogen pressure, and the size of the opening between the second sealing gasket 809 and the second connecting channel 805 is adjusted, or the second sealing gasket 809 blocks the second connecting channel 805 to close the second connecting channel 805.

[0040] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0041] A low-pressure, two-stage pressure-reducing valve for use in hydrogen health ventilators is provided. The valve comprises a stem nut assembly, an air outlet connector 7, and a piston 8. The valve comprises an air inlet 101, a fourth mating cavity 105, a second connecting channel 805, a fifth mating cavity 806, a second mating cavity 302, a first connecting channel 306, a third mating cavity 303, and an air outlet, all interconnected in sequence within the valve. The valve stem 4 position is adjusted by rotating a switch knob 6 to achieve pressure control. The valve has a novel, compact, and easy-to-operate structure. The valve body 1 includes a second sealing ring 103, the piston 8 includes a fourth sealing ring 801, a fifth sealing ring 802, and a third sealing ring 401, all of which are effectively sealed.

[0042] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A low-pressure two-stage pressure reducing valve, characterized in that: The pressure reducing valve is used for a hydrogen health ventilator, and the pressure reducing valve comprises a valve body, a valve cover, an air charging connector, a valve stem nut assembly and an air outlet connector, wherein: The valve body has an air inlet communicating with the outside, The upper end of the valve body is connected to the lower end of the valve cover, The valve stem nut assembly and the air outlet joint are both connected to the valve cover. The inflation connector is connected to the valve body. The valve stem nut assembly includes a valve stem and a nut, one end of the valve stem is placed in the valve cover, the other end of the valve stem is located outside the valve cover, and the nut fixes the valve stem to the valve cover; A first sealing gasket is embedded in one end of the valve stem, and a switch knob is installed at the other end of the valve stem. The switch knob can drive the valve stem to rotate to adjust the relative position of the valve stem and the valve cover. A second annular groove is provided on the outer circumference near one end of the valve stem, and a third sealing ring is provided in the second groove. A second matching cavity is formed between one end of the valve stem and the valve cover, a third matching cavity is formed between the air outlet joint and the valve cover, a first connecting channel is provided in the valve cover, and the second matching cavity and the third matching cavity are communicated with each other through the first connecting channel. The switch knob can drive the valve stem to move toward the outside of the valve cover to open the first connecting channel; and The switch knob can drive the valve stem to move toward the inside of the valve cover and make the first sealing gasket fit tightly against the sealing surface of the first connecting channel to close the first connecting channel. A piston is provided between the valve body and the valve cover, and a second sealing gasket is embedded in the lower end of the piston. The interior of the piston is hollow and consists of an upper section and a lower section. Both the upper section and the lower section are cylindrical structures. The outer diameter of the upper section is larger than the outer diameter of the lower section. The vertical cross-section of the hollow portion of the upper section is an inverted frustum structure, the upper end of the upper section is the large end of the frustum, and the lower end of the upper section is the small end of the frustum. A fourth mating cavity is formed between the lower end of the piston and the valve body, a second connecting channel is provided in the valve body, the fourth mating cavity is communicated with the air inlet through the second connecting channel, and a fifth mating cavity is formed between the upper end of the piston and the valve cover, the fifth mating cavity is communicated with the second mating cavity; The axis of the valve cover and the axis of the valve body are located on the same straight line, and the piston can move along the axis of the valve cover; The piston moves toward the valve body to close the second connecting channel, and the piston moves away from the valve body to open the second connecting channel.

2. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: The lower end of the valve body is also provided with an inflation port, one end of the inflation connector is placed in the valve body, and the other end of the inflation connector is located outside the valve body, and the inflation connector and the valve body are connected by a tapered thread; An inflatable core is installed inside the inflatable joint, and the inflatable core restricts the gas from flowing from the outside of the inflatable joint to the inflatable port; A first matching cavity is formed between the valve body and the inflation connector, and the inflation port is communicated with the first matching cavity.

3. The low-pressure two-stage pressure reducing valve according to claim 2, characterized in that: The inflation joint is provided with an inflation pipe along the axial direction, and the inflation joint is provided with a first groove, the inflation pipe is connected to the first groove, and the diameter of the first groove is larger than the aperture of the inflation pipe; The inflatable core includes an inflatable core seat and an inflatable core rod. The inflatable core seat is located in the first groove. One end of the inflatable core rod is connected to the inflatable core seat. The other end of the inflatable core rod is located in the inflatable pipe. The inflatable core can move axially along the inflatable pipe. A first sealing ring is provided on the inflatable core rod. The first sealing ring can seal between the inflatable core seat and the inflatable joint.

4. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: The air inlet is located at the lower end of the valve body and is connected to the air outlet of the external gas cylinder. The lower end of the valve body has a threaded structure connected to the external gas cylinder, and the upper end of the valve body has a threaded structure connected to the valve cover. The upper end of the threaded structure at the lower end of the valve body is covered with a second sealing ring, and the second sealing ring is used to seal between the valve body and the external gas cylinder.

5. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: The valve cover has a first threaded hole and a second threaded hole, the first threaded hole and the second threaded hole are arranged opposite to each other on the side wall of the valve cover, the valve stem nut assembly is connected to the valve cover through the first threaded hole, and the air outlet joint is connected to the valve cover through the second threaded hole; The lower end of the valve cover has a threaded structure connected to the valve body, and the valve cover and the valve body are connected by threads.

6. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: A set screw is provided on the side wall of the valve cover. The set screw passes through the valve cover and contacts the upper end of the valve body. Tightening the set screw can fix the axial position between the valve cover and the valve body.

7. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: The gas outlet joint is connected to the valve cover by a threaded connection, one end of the gas outlet joint is placed inside the valve cover, and the other end of the gas outlet joint is located outside the valve cover. The air outlet connector is provided with an air outlet hole, which is communicated with the third matching cavity. The hole-blocking screw blocks the air outlet hole when the air outlet connector is not in use.

8. The low-pressure two-stage pressure reducing valve according to claim 1, characterized in that: A first accommodating groove is provided in the lower end of the valve cover, a second accommodating groove is provided in the upper end of the valve body, the upper end of the piston is placed in the first accommodating groove, and the lower end of the piston is placed in the second accommodating groove; A spring is sleeved on the outer side of the upper portion of the lower section of the piston, and one end of the spring is in contact with the lower outer surface of the upper section of the piston; A third accommodating groove is further provided on the periphery of the second accommodating groove. The bottom of the third accommodating groove is higher than the bottom of the second accommodating groove. The other end of the spring contacts the bottom of the third accommodating groove.

9. The low-pressure two-stage pressure reducing valve according to claim 8, characterized in that: The outer diameter of the upper section is equal to the inner diameter of the first accommodating groove. The outer wall of the upper section is provided with an annular third groove, and a fourth sealing ring is provided in the third groove. The outer diameter of the lower section is equal to the inner diameter of the second accommodating groove. The outer wall of the lower section is provided with an annular fourth groove, and a fifth sealing ring is provided in the fourth groove. A filter is attached to the upper end of the piston, and the filter is used for preliminarily filtering the discharged gas.

10. The low-pressure two-stage pressure reducing valve according to claim 9, characterized in that: The pressure reducing valve limits the gas flow rate to 100-200 mL / min and the gas output pressure to below 0.1 MPa.

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