On-demand air supply control valve

Abstract

According to the on-demand air supply control valve, an air suction hole and an air inlet hole are formed in the top of an air inlet pipe, and pre-pressed air enters the upper portion of an upper piece of a lower membrane from a lower membrane air inlet hole in the side face of the bottom of the lower membrane. When suction is needed, negative pressure is generated on the upper portion of the upper film through air suction, the space sealed by the upper film is enlarged, the air pressure on the upper portion of the upper piece is reduced, and the air pressure on the lower portion of the upper piece is reduced. The downward pressure on the upper piece is reduced, so that the gas to be sucked reaches the suction nozzle from the suction channel; and meanwhile, pressure gas is continuously conveyed to the upper part of the upper piece from the gas inlet hole, new balance is achieved, the gas inlet pipe is sealed again until next gas suction, and continuous circulation is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of portable suction devices, and particularly relates to a demand supply control valve. Background Art

[0002] At present, oxygen therapy is used to improve hypoxemia, promote tissue metabolism, maintain the life activities of the body, and improve various body functions; people are in urgent need of oxygen to improve their physical condition after a long period of anaerobic exercise or dyspnea. However, most current oxygen supply devices are relatively bulky or inconvenient to carry. When climbing mountains, engaging in outdoor activities, or when older people are outdoors, if they suddenly feel unwell, they need an oxygen inhalation device to relieve their discomfort. However, current portable oxygen inhalation devices are generally stored in a pressurized tank and are absorbed by pressing the release button during use. However, this structure will release a relatively large amount of oxygen when pressed once, and the human body breathes intermittently, so it will cause waste, and continuous pressing is required during use, making the operation inconvenient. With the continuous development of social economy and scientific and technological strength, people's yearning for a better life is increasing day by day. Therefore, there is an urgent need to propose a convenient-to-use supply control valve. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a demand supply control valve to solve the technical problems in the above-mentioned prior art that when inhaling special gases, pressing and releasing by times causes gas waste, and continuous pressing is required during use, making the operation complicated.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A demand supply control valve includes: a support body, the support body has a plate-shaped support body, a sealing boss extends upward in the middle of the support body, an air inlet pipe connected to the gas source is provided at the bottom of the support body, a through hole of the air inlet pipe penetrates the sealing boss to form an air inlet hole, an air suction channel extending along the thickness direction is provided on one side of the support body, and the air suction channel penetrates the sealing boss to form an air suction hole;

[0006] A carrier plate, the carrier plate is fixedly installed with the support body, a lower diaphragm is installed between the carrier plate and the support body, the effective areas of the upper and lower surfaces of the lower diaphragm are different, the lower diaphragm has a lower diaphragm central column, the bottom surface of the lower diaphragm central column seals or opens the air inlet hole and the air suction hole, the lower diaphragm central column has a lower diaphragm air passage penetrating from the bottom side to the top, a carrier plate air passage extending downward is provided on one side of the carrier plate, the carrier plate air passage is communicated with the air suction channel, and a carrier plate ventilation hole is provided at the position corresponding to the lower diaphragm air passage in the middle of the carrier plate;

[0007] An upper diaphragm, the upper diaphragm is assembled on the upper part of the carrier plate, the circumference of the upper diaphragm forms a seal with the surface of the carrier plate, and the middle part of the upper diaphragm seals or opens the carrier plate ventilation hole;

[0008] The upper cover is fixedly connected to the support body. In the middle of the top of the upper cover, there is a through suction nozzle. A spring is arranged outside the bottom of the suction nozzle, and the spring presses on the middle part of the surface of the upper diaphragm, so that the upper diaphragm forms a seal for the air vent hole of the carrier plate under normal conditions. One side of the inner side of the upper cover has an upper cover suction channel. The bottom of the upper cover suction channel is communicated with the air duct of the carrier plate. The upper part of the upper cover suction channel is located above the upper diaphragm and is communicated with the space below the suction nozzle.

[0009] For a demand - supply control valve of the present utility model, the lower diaphragm has an I - shaped structure. On the central column of the lower diaphragm, there are a lower piece and an upper piece extending circumferentially. There is a lower diaphragm skeleton between the lower piece and the upper piece. The lower part of the central column of the lower diaphragm is lower than the bottom surface of the lower piece, and the top surface of the central column of the lower diaphragm is flush with the top surface of the upper piece.

[0010] For a demand - supply control valve of the present utility model, there are lower diaphragm side holes on the side surface of the bottom of the central column of the lower diaphragm, and there is an upper hole of the lower diaphragm at the top of the central column of the lower diaphragm. The lower diaphragm air duct is between the lower diaphragm side holes and the upper hole of the lower diaphragm.

[0011] For a demand - supply control valve of the present utility model, the lower diaphragm skeleton is composed of two spliced skeleton units. The splicing surfaces of the skeleton units respectively have a splicing shaft and a splicing hole, and the corresponding splicing shaft and splicing hole are installed in cooperation with each other. There is a lower diaphragm column avoidance hole in the middle of the lower diaphragm skeleton.

[0012] For a demand - supply control valve of the present utility model, the upper surface of the lower diaphragm skeleton has a sealing ring platform circumferentially. The middle part of the upper surface of the lower diaphragm skeleton has a skeleton support surface lower than the sealing ring platform. The upper piece has a space for up - and - down buffering at the corresponding position of the skeleton support surface.

[0013] For a demand - supply control valve of the present utility model, the opposite surfaces of the support body and the carrier plate respectively have a protruding support body sealing ring groove and a carrier plate sealing ring groove. The circumferences of the upper and lower surfaces of the lower diaphragm have lower diaphragm sealing convex rings corresponding to the positions of the support body sealing ring groove and the carrier plate sealing ring groove.

[0014] For a demand - supply control valve of the present utility model, the carrier plate has a plate - shaped carrier plate body. In the middle of the carrier plate body, there is a carrier plate boss. The carrier plate air vent penetrates through the carrier plate boss. The circumference of the carrier plate body has a carrier plate sealing groove for sealing with the upper diaphragm.

[0015] For a demand - supply control valve of the present utility model, the upper diaphragm includes an upper diaphragm large surface. The bottom surface of the middle part of the upper diaphragm large surface has an upper diaphragm sealing boss. The upper diaphragm sealing boss contacts or separates from the surface of the carrier plate boss. The circumference of the upper diaphragm large surface has an upper diaphragm sealing ring extending towards the bottom surface. The upper diaphragm sealing ring is installed in cooperation with the carrier plate sealing groove.

[0016] A gas supply control valve on demand of the utility model, wherein a plurality of support columns are circumferentially arranged on the top surface of the support body, carrier plate connection holes are arranged at positions corresponding to the support columns on the carrier plate body, the carrier plate connection holes are stepped holes, and screws are arranged in the carrier plate connection holes to be connected with the support columns.

[0017] A gas supply control valve on demand of the utility model, wherein the upper cover has an upper cover housing, the upper cover housing is in an inverted cup-shaped structure, through connection clamping holes are circumferentially arranged at the bottom of the upper cover housing, connection clamping buckles are arranged at positions corresponding to the connection clamping holes on the support body, the connection clamping buckles are installed in cooperation with the connection clamping holes to connect and fix the support body and the upper cover, an upper cover convex ring extending downward is arranged inside the top of the upper cover housing, and the bottom surface of the upper cover convex ring presses the upper surface of the upper membrane sealing ring.

[0018] A gas supply control valve on demand of the utility model, wherein the support body has a lower cover, the lower cover has a lower cover housing, a tubular structure extending downward is arranged in the middle of the lower cover housing, a gas cylinder nozzle clamping hole is arranged at the bottom of the tubular structure, the gas cylinder nozzle clamping hole is clamped with a flange at the top of the gas cylinder, internal connection threads are arranged inside the tubular structure, external connection threads extending downward are arranged at the bottom of the support body, and the external connection threads are installed in cooperation with the internal connection threads.

[0019] A gas supply control valve on demand of the utility model, wherein carrier plate air leakage grooves extending outward from the center are arranged on the surface of the carrier plate body, and the carrier plate air leakage grooves extend to the outside of the carrier plate sealing groove.

[0020] The beneficial effects produced by the utility model are as follows: A gas supply control valve on demand is proposed. By arranging an air suction hole and an air inlet hole at the top of the air inlet pipe, pre-pressurized gas enters the upper part of the upper sheet of the lower diaphragm from the lower diaphragm air inlet hole on the side of the bottom of the lower diaphragm. Since the effective areas of the upper sheet and the lower sheet of the lower diaphragm are different, the same air pressure forms a pressure difference on the surfaces of the upper sheet and the lower sheet, so that the lower diaphragm central column naturally presses and seals the sealing boss of the air inlet pipe in the unused state. When inhalation is needed, negative pressure is generated on the upper part of the upper membrane by inhalation, so that the space sealed by the upper membrane becomes larger, so that the air pressure on the upper part of the upper sheet is reduced, so that the downward pressure on the upper sheet is reduced, so that the gas to be inhaled reaches the suction nozzle through the suction channel. When the inhalation action ends, the negative pressure for inhalation on the upper part of the upper membrane disappears, the upper membrane falls back under the action of the spring and closely fits with the carrier plate boss to form a seal. At the same time, pressure gas continues to be conveyed to the upper part of the upper sheet at the air inlet hole, reaching a new air pressure balance and sealing the air inlet hole again until the next inhalation, and continuously circulating. Description of the Drawings

[0021] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0022] Figure 1is the overall sectional view of the embodiment of the present utility model;

[0023] Figure 2 is the upper axonometric view of the embodiment of the present utility model;

[0024] Figure 3 is the lower axonometric view of the embodiment of the present utility model;

[0025] Figure 4 is the axonometric view of the support body of the embodiment of the present utility model;

[0026] Figure 5 is the perspective view of the support body of the embodiment of the present utility model;

[0027] Figure 6 is the sectional view of the support body of the embodiment of the present utility model;

[0028] Figure 7 is the schematic diagram of the lower diaphragm of the embodiment of the present utility model;

[0029] Figure 8 is the sectional view of the lower diaphragm of the embodiment of the present utility model;

[0030] Figure 9 is the perspective view of the lower diaphragm of the embodiment of the present utility model;

[0031] Figure 10 is the partial view of the transition plate of the embodiment of the present utility model;

[0032] Figure 11 is the axonometric view of the carrier plate of the embodiment of the present utility model;

[0033] Figure 12 is the sectional view of the carrier plate of the embodiment of the present utility model;

[0034] Figure 13 is the sectional view of the upper diaphragm of the embodiment of the present utility model;

[0035] Figure 14 is the schematic diagram of the upper cover of the embodiment of the present utility model;

[0036] Figure 15 is the sectional view of the upper cover of the embodiment of the present utility model;

[0037] Figure 16 is the sectional view of the lower cover of the embodiment of the present utility model. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0039] As Figure 1-16 shown, a gas supply control valve on demand includes: a support body 100, the support body 100 having a plate-shaped support body 110, the middle of the support body 110 having a sealing boss 121 extending upward, the bottom of the support body 110 having an intake pipe 120 connected to a gas source, the through hole of the intake pipe 120 passing through the sealing boss 121 to form an intake hole 122, one side of the support body 110 having an intake channel 123 extending in the thickness direction, the intake channel 123 passing through the sealing boss 121 to form an intake hole 124;

[0040] a carrier plate 300, the carrier plate 300 being fixedly installed with the support body 100, a lower diaphragm 200 being installed between the carrier plate 300 and the support body 100, the effective areas of the upper and lower surfaces of the lower diaphragm 200 being different, the lower diaphragm 200 having a lower diaphragm central column 210, the bottom surface of the lower diaphragm central column 210 sealing or opening the intake hole 122 and the intake hole 124, the lower diaphragm central column 210 having a lower diaphragm air passage penetrating from the bottom side to the top, one side of the carrier plate 300 having a carrier plate air passage 360 extending downward, the carrier plate air passage 360 communicating with the intake channel 123, and a carrier plate ventilation hole 330 being provided at the position corresponding to the lower diaphragm air passage in the middle of the carrier plate 300;

[0041] an upper diaphragm 400, the upper diaphragm 400 being assembled on the upper part of the carrier plate 300, the circumference of the upper diaphragm 400 forming a seal with the surface of the carrier plate 300, and the middle of the upper diaphragm 400 sealing or opening the carrier plate ventilation hole 330;

[0042] Upper cover 500, the upper cover 500 is fixedly connected to the support body 100. In the middle of the top of the upper cover 500, there is a through suction nozzle 530. A spring is arranged on the outer side of the bottom of the suction nozzle 530, and the spring presses the middle part of the surface of the upper diaphragm 400. Under normal conditions, the upper diaphragm 400 seals the vent hole 330 of the carrier plate. On one inner side surface of the upper cover 500, there is an upper cover suction channel 540. The bottom of the upper cover suction channel 540 is communicated with the carrier plate air duct 360. The upper part of the upper cover suction channel 540 is located above the upper diaphragm 400 and is communicated with the space below the suction nozzle 530.

[0043] In a preferred embodiment of the present invention, the lower diaphragm 200 has an I-shaped structure. On the lower diaphragm central column 210, a lower piece 230 and an upper piece 220 extend circumferentially. There is a lower diaphragm skeleton 240 between the lower piece 230 and the upper piece 220. The lower part of the lower diaphragm central column 210 is lower than the bottom surface of the lower piece 230, and the top surface of the lower diaphragm central column 210 is flush with the top surface of the upper piece 220.

[0044] In a preferred embodiment of the present invention, on the side surface of the bottom of the lower diaphragm central column 210, there is a lower diaphragm side hole 211. On the top of the lower diaphragm central column 210, there is a lower diaphragm upper hole 212. The lower diaphragm air duct is between the lower diaphragm side hole 211 and the lower diaphragm upper hole 212.

[0045] In a preferred embodiment of the present invention, the lower diaphragm skeleton 240 is composed of two spliced skeleton units 241. The splicing surfaces of the skeleton units 241 respectively have a splicing shaft 243 and a splicing hole 242. The corresponding splicing shaft 243 and splicing hole 242 are installed in cooperation with each other. In the middle of the lower diaphragm skeleton 240, there is a lower diaphragm column avoidance hole 245.

[0046] In a preferred embodiment of the present invention, on the circumferential direction of the upper surface of the lower diaphragm skeleton 240, there is a sealing ring platform. In the middle of the upper surface of the lower diaphragm skeleton 240, there is a skeleton support surface 244 lower than the sealing ring platform. At the position corresponding to the skeleton support surface 244 of the upper piece 220, there is a space for up and down buffering.

[0047] In a preferred embodiment of the present invention, on the opposite surfaces of the support body 100 and the carrier plate 300, there are respectively protruding support body sealing ring grooves 130 and carrier plate sealing ring grooves 380. On the circumferential direction of the upper and lower surfaces of the lower diaphragm 200, at the positions corresponding to the support body sealing ring grooves 130 and the carrier plate sealing ring grooves 380, there are lower diaphragm sealing convex rings.

[0048] In a preferred embodiment of the present invention, the carrier plate 300 has a plate-shaped carrier plate body 310. In the middle of the carrier plate body 310, there is a carrier plate boss 320. The carrier plate vent hole 330 penetrates through the carrier plate boss 320. On the circumferential direction of the carrier plate body 310, there is a carrier plate sealing groove 350 for sealing with the upper diaphragm 400.

[0049] In a preferred embodiment of the present utility model, the upper diaphragm 400 includes an upper diaphragm large surface 410. A sealing boss 430 of the upper diaphragm is provided on the bottom surface of the middle part of the upper diaphragm large surface 410. The sealing boss 430 of the upper diaphragm contacts or separates from the surface of the carrier plate boss 320. An upper diaphragm sealing ring 420 extending towards the bottom surface is provided circumferentially on the upper diaphragm large surface 410. The upper diaphragm sealing ring 420 is fitted and installed with the carrier plate sealing groove 350.

[0050] In a preferred embodiment of the present utility model, a plurality of support columns 140 are provided circumferentially on the top surface of the support body 110. Carrier plate connection holes 370 are provided at positions corresponding to the support columns 140 on the carrier plate body 310. The carrier plate connection holes 370 are stepped holes. Screws are inserted into the carrier plate connection holes 370 to connect with the support columns 140.

[0051] In a preferred embodiment of the present utility model, the upper cover 500 has an upper cover housing 510. The upper cover housing 510 has an inverted cup-shaped structure. Through connection card holes 520 are provided circumferentially at the bottom of the upper cover housing 510. Connection buckles 160 are provided at positions corresponding to the connection card holes 520 on the support body 110. The connection buckles 160 are fitted and installed with the connection card holes 520 to connect and fix the support body 100 and the upper cover 500. An upper cover convex ring 550 extending downward is provided inside the top of the upper cover housing 510. The bottom surface of the upper cover convex ring 550 presses against the upper surface of the upper diaphragm sealing ring 420.

[0052] In a preferred embodiment of the present utility model, the support body 100 has a lower cover 600. The lower cover 600 has a lower cover housing 620. A tubular structure extending downward is provided in the middle of the lower cover housing 620. A gas cylinder nozzle clamping hole 610 is provided at the bottom of the tubular structure. The gas cylinder nozzle clamping hole 610 is clamped with the flange at the top of the gas cylinder. An internal connection thread 630 is provided inside the tubular structure. An external connection thread 150 extending downward is provided at the bottom of the support body 110. The external connection thread 150 is fitted and installed with the internal connection thread 630.

[0053] In a preferred embodiment of the present utility model, carrier plate air release grooves 340 extending from the center to the outside are provided on the surface of the carrier plate body 310. The carrier plate air release grooves 340 extend to the outside of the carrier plate sealing groove 350.

[0054] Brief description of the use principle: connect the air inlet pipe 120 of the present application with the air outlet nozzle of the gas cylinder. Since the air inlet pipe 120 forms a certain pressure on the air outlet nozzle of the gas cylinder, the gas moves upward from the air inlet pipe 120, and then overflows from the air inlet hole 122 and the air suction hole 124. The gas overflowing from the air inlet hole 122 fills the space between the lower sheet 230 and the supporting body 110, enters from the side hole 211 of the lower membrane, overflows from the upper hole 212 of the lower membrane, and quickly fills the space between the upper sheet 220 and the bottom surface of the carrier body 310. At this time, the pressure between the upper sheet 220 and the lower sheet 230 of the lower membrane 200 is equal, but the effective action area is different. , thereby achieving the effect of reducing the pressure of the gas output from the gas cylinder. At this time, the upper diaphragm 400 will not be opened to exhaust. Instead, as the pressure of the upper sheet 220 of the lower diaphragm 200 increases and reaches the critical value, the pressure generated will squeeze the lower diaphragm center column 210 downward, thereby blocking the air inlet hole 122 and the air suction hole 124 on the surface of the sealing boss 121, thereby achieving the effect of sealing. In this process, gas continues to accumulate, and the gas pressure on the surfaces of the upper sheet 220 and the lower sheet 230 is equal. However, since there is a certain gap between the upper surface of the lower membrane skeleton 240 and the upper sheet, and the bottom surface of the lower membrane skeleton 240 is in close contact with the upper surface of the lower sheet 230, the upper When the pressure on the upper film 220 is greater, the lower film center column 210 is subjected to a downward force. When the critical value is reached, the lower film center column 210 presses and seals the sealing boss 121, so that the gas cylinder stops exhausting gas. When inhalation is needed, the user inhales at the inhalation nozzle 530, thereby forming a negative pressure above the upper film 400. Since the upper film large surface 410 has the elasticity of floating up and down, which is brought by the bowl-shaped structural characteristics and the material itself, when the upper film generates negative pressure due to inhalation, the upper film 400 is lifted upward, thereby destroying the sealing effect of the upper film sealing boss 430, resulting in the carrier plate vent hole. Ventilation is performed at 330, and the gas at the carrier plate vent hole 330 is discharged to the atmosphere through the carrier plate air relief groove 340. The exhaust of the carrier plate vent hole 330 will cause the air pressure in the space between the facing surfaces of the upper sheet 220 and the carrier plate 300 to decrease. At the moment of reduction, the air pressure between the upper sheet 220 and the lower sheet 230 of the lower diaphragm 200 has no time to balance, which leads to the overall upward movement of the lower diaphragm 200, thereby opening the air inlet hole 122 to form ventilation, so that the gas in the gas cylinder enters the air intake nozzle 530 from the air intake channel 123 for the user to inhale, and the other part enters the air inlet hole 122 for the next sealing balance, and this reciprocating cycle is used to achieve the effect of inhalation on demand.

[0055] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0057] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A gas supply control valve on demand, characterized in that: include: A support body (100), the support body (100) comprising a plate-shaped support body (110), a sealing boss (121) extending upwardly in the middle of the support body (110), an air intake pipe (120) connected to an air source at the bottom of the support body (110), a through hole of the air intake pipe (120) penetrating the sealing boss (121) to form an air intake hole (122), and an air intake channel (123) extending in a thickness direction on one side of the support body (110), the air intake channel (123) penetrating the sealing boss (121) to form an air intake hole (124); A carrier plate (300), wherein the carrier plate (300) is fixedly mounted on a support body (100), a lower diaphragm (200) is mounted between the carrier plate (300) and the support body (100), the upper and lower surfaces of the lower diaphragm (200) having different effective areas, the lower diaphragm (200) having a lower diaphragm center column (210), the bottom surface of the lower diaphragm center column (210) sealing or opening the air inlet hole (122) and the air suction hole (124), the lower diaphragm center column (210) having a lower diaphragm airway extending from the bottom side through the top, a carrier plate airway (360) extending downwardly is provided on one side of the carrier plate (300), the carrier plate airway (360) is connected to the air suction channel (123), and a carrier plate vent hole (330) is provided in the middle of the carrier plate (300) at a position corresponding to the lower diaphragm airway; An upper diaphragm (400), the upper diaphragm (400) being mounted on the upper part of the carrier plate (300), the upper diaphragm (400) being sealed with the surface of the carrier plate (300) in the circumferential direction, and the middle part of the upper diaphragm (400) sealing or opening the carrier plate vent hole (330); An upper cover (500) is fixedly connected to the support body (100), and a through-going air suction nozzle (530) is provided in the middle of the top of the upper cover (500). A spring is provided on the outer side of the bottom of the air suction nozzle (530), and the spring presses the middle of the surface of the upper diaphragm (400), so that the upper diaphragm (400) forms a seal with the carrier plate vent (330) under normal conditions. An upper cover air suction channel (540) is provided on one inner side of the upper cover (500), and the bottom of the upper cover air suction channel (540) is connected to the carrier plate air channel (360). The upper part of the upper cover air suction channel (540) is located above the upper diaphragm (400) and is connected to the space below the air suction nozzle (530).

2. The on-demand air supply control valve according to claim 1, characterized in that: The lower membrane sheet (200) is in an I-shaped structure, and a lower sheet (230) and an upper sheet (220) are circumferentially extended from the lower membrane center column (210), and a lower membrane skeleton (240) is provided between the lower sheet (230) and the upper sheet (220). The lower portion of the lower membrane center column (210) is lower than the bottom surface of the lower sheet (230), and the top surface of the lower membrane center column (210) is flush with the top surface of the upper sheet (220).

3. The on-demand air supply control valve according to claim 2, characterized in that: The lower membrane frame (240) is composed of two assembled frame units (241), the assembled surfaces of the frame units (241) respectively having an assembled axis (243) and an assembled hole (242), the assembled axis (243) and the assembled hole (242) at corresponding positions are installed in cooperation with each other, and the middle part of the lower membrane frame (240) has a lower membrane column avoidance hole (245).

4. The on-demand air supply control valve according to claim 3, characterized in that: The upper surface of the lower membrane skeleton (240) is provided with a sealing ring platform in the circumferential direction, the middle portion of the upper surface of the lower membrane skeleton (240) is provided with a skeleton support surface (244) which is lower than the sealing ring platform, and the upper sheet (220) is provided with upper and lower buffer spaces at positions corresponding to the skeleton support surface (244).

5. The on-demand air supply control valve according to claim 4, characterized in that: The facing surfaces of the support body (100) and the carrier plate (300) are respectively provided with a protruding support body sealing ring groove (130) and a carrier plate sealing ring groove (380), and the upper and lower surfaces of the lower diaphragm (200) are both provided with lower diaphragm sealing convex rings at positions corresponding to the support body sealing ring groove (130) and the carrier plate sealing ring groove (380) in the circumferential direction.

6. The on-demand air supply control valve according to claim 5, characterized in that: The carrier (300) has a plate-shaped carrier body (310), a carrier boss (320) is provided in the middle of the carrier body (310), the carrier vent (330) passes through the carrier boss (320), and the carrier body (310) has a carrier sealing groove (350) in the circumferential direction that is sealed with the upper diaphragm (400).

7. The on-demand air supply control valve according to claim 6, characterized in that: The upper diaphragm (400) comprises an upper diaphragm large surface (410), the middle bottom surface of the upper diaphragm large surface (410) is provided with an upper diaphragm sealing boss (430), the upper diaphragm sealing boss (430) is in contact with or separated from the surface of the carrier plate boss (320), the upper diaphragm large surface (410) is circumferentially provided with an upper diaphragm sealing ring (420) extending toward the bottom surface, the upper diaphragm sealing ring (420) is mounted in cooperation with the carrier plate sealing groove (350).

8. The on-demand air supply control valve according to claim 7, characterized in that: The top surface of the support body (110) is provided with a plurality of support columns (140) in the circumferential direction, and the carrier body (310) is provided with carrier connection holes (370) at positions corresponding to the support columns (140), the carrier connection holes (370) being step holes, and screws are passed through the carrier connection holes (370) for connection with the support columns (140).

9. The on-demand air supply control valve according to claim 8, characterized in that: The upper cover (500) comprises an upper cover shell (510), the upper cover shell (510) is an inverted cup-shaped structure, the bottom circumference of the upper cover shell (510) comprises a connecting card hole (520) extending therethrough, the support body (110) comprises a connecting card buckle (160) at a position corresponding to the connecting card hole (520), the connecting card buckle (160) and the connecting card hole (520) are installed in cooperation with each other so that the support body (100) and the upper cover (500) are connected and fixed, and the inner side of the top of the upper cover shell (510) comprises an upper cover convex ring (550) extending downward, the bottom surface of the upper cover convex ring (550) presses the upper surface of the upper membrane sealing ring (420) tightly.

10. The on-demand air supply control valve according to claim 9, characterized in that: The support body (100) has a lower cover (600), the lower cover (600) has a lower cover shell (620), the lower cover shell (620) has a tubular structure extending downward in the middle, the bottom of the tubular structure has a gas cylinder mouth clamping hole (610), the gas cylinder mouth clamping hole (610) is clamped with the flange on the top of the gas cylinder, the inner side of the tubular structure has a connecting internal thread (630), and the bottom of the support body (110) has a connecting external thread (150) extending downward, and the connecting external thread (150) is installed in coordination with the connecting internal thread (630).

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