An oxygen supply valve that is easy to control the flow rate

Abstract

The present invention relates to an oxygen supply valve that is convenient for regulating flow, comprising a gas cylinder interface (10), a lung-type functional component (4), a pressure reducing switch (1), a negative pressure nozzle (5) and an oxygen supply nozzle (6), wherein the oxygen supply valve is connected to the oxygen cylinder via the gas cylinder interface (10), an oxygen supply channel (105) is arranged in the oxygen supply valve, the pressure reducing switch (1) and the oxygen supply nozzle (6) are both connected to the oxygen supply channel (105), the oxygen supply nozzle (6) is located at the end of the oxygen supply channel (105), the lung-type functional component (4) is arranged on the oxygen supply channel (105) between the pressure reducing switch (1) and the oxygen supply nozzle (6), and the lung-type oxygen supply component is connected to the negative pressure nozzle (5) for controlling the opening and closing of the oxygen supply channel (105). The present invention improves the stability of the oxygen supply valve as a whole, makes the oxygen supply valve easier to operate, has more stable performance, and can intuitively observe the oxygen supply state and oxygen supply frequency.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen supply equipment, in particular to an oxygen supply valve which is convenient for regulating flow. Background Art

[0002] The oxygen supply valve is a valve element installed on the gas cylinder to control the release of gas from the gas cylinder. The existing oxygen supply valve has the following problems: 1. After the oxygen supply valve is opened, it is difficult to close the oxygen supply valve, because the high-pressure switch of the oxygen supply valve facing the gas cylinder interface is directly affected by the high-pressure gas in the gas cylinder, so the high-pressure gas has a large resistance to the high-pressure switch. When the high-pressure switch is gradually closed, the resistance to the high-pressure switch will also gradually increase, and even the high-pressure switch cannot be turned. At the same time, because the high-pressure switch is difficult to close, when the high-pressure switch cannot be turned, the operator cannot judge whether the high-pressure switch is completely closed, and there is a problem of gas leakage. 2. An emergency switch is usually provided on the oxygen supply valve. The emergency switch is suitable for after the lung-type component fails. When the emergency switch is turned on, oxygen will continue to flow out, so that the user can continue to use oxygen, which belongs to the emergency oxygen supply guarantee function. For emergency closing of the oxygen supply valve, the open and closed states of the existing oxygen supply switch are unstable, and it is easy to move under external pressure and collision, thereby switching between the open and closed states. 3. The actual oxygen supply frequency of the oxygen supply valve cannot be observed intuitively, and the oxygen flow supplied to the user is relatively slow. The ordinary oxygen supply method uses lung-type oxygen supply, which requires the lung-type oxygen supply component to sense negative pressure before it starts supplying oxygen. Therefore, it is difficult for users to intuitively judge the actual oxygen supply status during use. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an oxygen supply valve that can be easily opened and closed, has a stable emergency switch, and can intuitively observe the oxygen supply frequency and the on and off status of the oxygen supply.

[0004] The objective of the present invention is achieved through the following technical solutions: an oxygen supply valve that is convenient for regulating flow, comprising a gas cylinder interface, a lung-type functional component, a pressure reducing switch, a negative pressure nozzle and an oxygen supply nozzle, the oxygen supply valve being connected to the oxygen cylinder through the gas cylinder interface, an oxygen supply channel being arranged in the oxygen supply valve, the pressure reducing switch and the oxygen supply nozzle being communicated with the oxygen supply channel, the oxygen supply nozzle being located at the end of the oxygen supply channel, the lung-type functional component being arranged on the oxygen supply channel between the pressure reducing switch and the oxygen supply nozzle, and the pressure sensing interface of the lung-type oxygen supply component being communicated with the negative pressure nozzle for controlling the opening and closing of the oxygen supply channel.

[0005] Preferably, the lung-type oxygen supply component is any one of a diaphragm or a diaphragm box.

[0006] Preferably, the pressure reducing switch comprises a pressure reducing shaft, a pressure reducing housing, a switch shaft and a switch handle, the valve body of the oxygen supply valve is provided with an axial hole, the axial hole is communicated with the gas cylinder interface, a section of the oxygen supply channel between the axial hole and the gas cylinder interface is a high-pressure channel, the high-pressure channel is coaxial with the axial hole, one end of the pressure reducing shaft is inserted into the axial hole, there is a gap between the pressure reducing shaft and the axial hole, the connecting port of the oxygen supply channel between the axial hole and the oxygen supply nozzle is located on the side wall of the axial hole, and the other end is located in the pressure reducing housing, the pressure reducing housing is fixedly connected to the valve body, a step hole is provided in the pressure reducing housing, a step matching the step hole is provided on the switch shaft, one end of the switch shaft abuts against the pressure reducing shaft, and the other end is located outside the pressure reducing housing, the end with a larger diameter of the step hole is located on the side close to the pressure reducing shaft, a switch handle is fixed to the end of the switch shaft located outside the pressure reducing housing, and a transmission thread is provided between the switch shaft and the pressure reducing housing. The pressure reducing shaft reduces the pressure of the gas flowing out of the high-pressure channel by throttling, so that the gas contacted by the switch shaft is low-pressure gas, thereby reducing the twisting resistance of the switch shaft, allowing the user to easily twist the switch shaft and realize easy and stable switching of the oxygen supply valve.

[0007] Preferably, the diameter of the end of the decompression shaft close to the high-pressure channel is smaller than that of the middle part, and the diameter of the end in contact with the switch shaft is larger, so that the decompression shaft forms three sections with different diameters. The oxygen supply channel is directly opposite to the side of the section with the smallest diameter, and the section with the largest diameter of the decompression shaft is completely located in the decompression housing.

[0008] Preferably, a countersunk hole is provided at one end of the pressure reducing shaft close to the high-pressure channel, and a plug is provided in the countersunk hole. The thickness of the plug is greater than the depth of the countersunk hole. The position of the plug is opposite to the high-pressure channel and the cross-sectional area of ​​the plug is greater than the cross-sectional area of ​​the high-pressure channel, thereby ensuring that the plug can completely block the high-pressure channel.

[0009] Preferably, a flow limiter is provided on the valve body, and the flow limiter is located on the oxygen supply channel between the lung function component and the pressure reducing switch. The flow of oxygen can be adjusted by the flow limiter so that the amount of oxygen supplied by the oxygen supply valve meets the actual needs of the user. The flow limiter is a pre-set flow, and the flow cannot be adjusted after it is set. If the flow needs to be adjusted, the flow limiter needs to be replaced instead of adjusting the flow through the flow limiter.

[0010] Preferably, a pressure gauge, a safety valve and an oxygen filling port are also provided on the valve body of the oxygen supply valve, and the pressure gauge, the safety valve and the oxygen filling port are all connected to the high-pressure channel.

[0011] Preferably, the oxygen supply valve is also provided with an emergency switch and an emergency channel, the emergency switch is located on the emergency channel, the oxygen supply channel and the emergency channel have two connecting ports, the pulmonary function component is located on the oxygen supply channel between the two connecting ports, when the pulmonary function component cannot operate normally, the emergency switch can be turned on to supply oxygen, after turning on the emergency switch, the oxygen supply mode of the oxygen supply valve is changed to continuous oxygen supply, the emergency switch includes a locking pin, a fixing ring and a handle, the oxygen supply valve is provided with a pin hole matching the locking pin, of the two connecting ports, the connecting port located upstream of the airflow is located in the middle of the pin hole, and the connecting port located downstream of the airflow is located in the middle of the pin hole. At the bottom of the hole, an upper shoulder, a middle shoulder and a lower shoulder are arranged on the locking pin. When the locking pin is vertically arranged, a first sealing ring is arranged above the upper shoulder, and a second sealing ring is arranged between the middle shoulder and the lower shoulder. The locking pin has two matching positions in the valve body, namely a locked position and an open position. When the locking pin is in the locked position, the air source through hole is located between the first sealing ring and the second sealing ring. When the locking pin is in the open position, the air source through hole and the air source outlet are located on the same side of the second sealing ring. The fixing ring is fixedly connected to the pin hole, and the top of the locking pin passes through the middle of the fixing ring, and the passed part is fixedly connected to the handle.

[0012] Preferably, the pin hole includes a large diameter section and a small diameter section, the diameter of the upper shoulder is the same between the large diameter sections, the diameter of the middle shoulder and the lower shoulder are the same as the diameter of the small diameter section, and the connection port upstream of the airflow is located on the side wall of the large diameter section. When the pin shaft is in a locked state, the two end faces of the upper shoulder and the middle shoulder are subjected to the same air pressure, while the upper end face of the lower shoulder is subjected to pressure from the second sealing ring, so that the lock pin is always subjected to downward air pressure. At this time, a certain force needs to be applied to lift the handle upward to move the lock pin upward, thereby ensuring the stability of the lock pin in the locked position. When the lock pin is in the open position, the lock pin will be affected by the airflow when it moves downward, and a certain force needs to be applied to press the lock pin downward. This avoids changes in the lock pin position due to accidental minor collisions.

[0013] Preferably, the oxygen supply nozzle and the negative pressure nozzle are located on a transparent shell, and the transparent shell is fixedly connected to the valve body of the oxygen supply valve, a float is provided in the oxygen supply channel on the transparent shell that is connected to the oxygen supply nozzle, and limiting structures are provided on both sides of the oxygen supply channel on the transparent shell, the oxygen supply channel in the transparent shell is vertically arranged, and the bottom end of the oxygen supply channel in the transparent shell is connected to the oxygen supply channel in the oxygen supply valve, and the top end is connected to the oxygen supply interface.

[0014] Preferably, a scale can be set on the transparent shell, and the oxygen supply status can be directly judged by observing the jumping height of the float. When the negative pressure formed by the user's breathing is very low, the oxygen supply will also be very small, so the impact of the oxygen flow on the float is low, and the jumping height of the float is significantly reduced. Therefore, the jumping height of the float can intuitively judge the strength of the user's breathing. By observing the frequency of the float, it is possible to intuitively understand whether the frequency of oxygen supply is normal, which can be used as a real-time monitoring of the lung-type oxygen supply component.

[0015] Preferably, the limiting structures on both sides of the float are respectively located on the upper and lower sides of the float, and the limiting structure located on the lower side is a reduced diameter section formed by reducing the diameter of a section of the oxygen supply channel, and the transition surface between the top of the reduced diameter section and the normal oxygen supply channel is any one of an arc surface or a cone surface. When there is airflow passing through, the float will inevitably be blown up by the airflow. In order to allow the airflow to pass through, the oxygen supply nozzle can be set in the middle of the oxygen supply channel. When oxygen flows, the float is located in the upper part of the oxygen supply channel under the action of the airflow, or the diameter of the float is set to be smaller than the diameter of the oxygen supply channel to ensure that the float does not block the flow of oxygen. The arc surface matches the shape of the float, and the limiting structure located on the upper side is any one of a convex block or a mesh set in the oxygen supply channel. When the oxygen supply interface is connected to the top of the channel where the float is located, a convex block or a mesh needs to be set in the oxygen supply channel to prevent the float from blocking the oxygen supply nozzle.

[0016] The present invention has the following advantages:

[0017] 1. Reduce the closing resistance of the high-pressure switch of the oxygen supply valve, so that users can easily close the oxygen supply valve, and ensure that the oxygen supply valve can be completely closed to avoid incomplete closure and leakage;

[0018] 2. After the emergency switch is closed, it will be subject to the pressure of the gas in the gas cylinder, achieving the purpose of gas self-locking. After the emergency switch is closed, the user needs to exert a certain force to open the emergency switch, ensuring the stability of the locked state of the emergency switch;

[0019] 3. Through the jumping state of the float, you can visually observe the size of the oxygen flow rate and whether the oxygen supply frequency is normal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 Another structural schematic diagram of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a pressure reducing switch;

[0023] Figure 4It is a structural schematic diagram of the emergency switch;

[0024] Figure 5 It is a schematic diagram of the structure of the transparent shell, the oxygen supply nozzle and the negative pressure nozzle;

[0025] Figure 6 It is a structural diagram of the position of the float;

[0026] In the figure: 1-decompression switch, 2-pressure gauge, 3-emergency switch, 4-pulmonary function component, 5-negative pressure nozzle, 6-oxygen supply nozzle, 7-oxygen filling port, 8-safety valve, 9-flow limiter, 10-gas cylinder interface, 12-transparent shell, 13-float, 14-reduced diameter section, 101-decompression shell, 102-decompression shaft, 103-high pressure channel, 104-plug, 105-oxygen supply channel, 106-switch shaft, 107-switch handle, 301-handle, 302-lock pin, 303-fixing ring, 304-upper shaft shoulder, 305-middle shaft shoulder, 306-lower shaft shoulder, 307-second sealing ring, 308-first sealing ring. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0028] like Figure 1-6 As shown, an oxygen supply valve that is convenient for regulating flow rate includes a gas cylinder interface 10, a lung-type functional component 4, a pressure reducing switch 1, a negative pressure nozzle 5 and an oxygen supply nozzle 6. The oxygen supply valve is connected to the oxygen cylinder through the gas cylinder interface 10. An oxygen supply channel 105 is arranged in the oxygen supply valve. The pressure reducing switch 1 and the oxygen supply nozzle 6 are both connected to the oxygen supply channel 105. The oxygen supply nozzle 6 is located at the end of the oxygen supply channel 105. The lung-type functional component 4 is arranged on the oxygen supply channel 105 between the pressure reducing switch 1 and the oxygen supply nozzle 6, and the pressure sensing interface of the lung-type oxygen supply component is connected to the negative pressure nozzle 5 for controlling the opening and closing of the oxygen supply channel 105.

[0029] Preferably, the lung-type oxygen supply component is any one of a diaphragm or a diaphragm box. The lung-type oxygen supply component 4 controls the opening and closing of the oxygen supply channel 105 according to the user's breathing, so the lung-type oxygen supply component 4 is equipped with a pressure sensing interface for receiving the negative pressure signal during the user's breathing process, and is also provided with a diaphragm structure. When the user inhales, the diaphragm deforms to open the oxygen supply channel 105. When the user does not inhale, the diaphragm automatically returns to block the oxygen supply channel 105.

[0030] Preferably, the decompression switch 1 includes a decompression shaft 102, a decompression housing 101, a switch shaft 106 and a switch handle 107. An axial hole is provided on the valve body of the oxygen supply valve. The axial hole is communicated with the gas cylinder interface 10. A section of the oxygen supply channel 105 between the axial hole and the gas cylinder interface 10 is a high-pressure channel 103. The high-pressure channel 103 is coaxial with the axial hole. One end of the decompression shaft 102 is inserted into the axial hole. There is a gap between the decompression shaft 102 and the axial hole. The connecting port of the oxygen supply channel 105 between the axial hole and the oxygen supply nozzle 6 is located on the side wall of the axial hole. The other end of the oxygen supply channel 105 is connected to the axial hole. The end of the switch shaft 106 is located in the decompression housing 101, and the decompression housing 101 is fixedly connected to the valve body. A step hole is provided in the decompression housing 101, and a step matching the step hole is provided on the switch shaft 106. One end of the switch shaft 106 abuts against the decompression shaft 102, and the other end is located outside the decompression housing 101. The end with a larger diameter of the step hole is located on the side close to the decompression shaft 102. A switch handle 107 is fixed on the end of the switch shaft 106 located outside the decompression housing 101, and a transmission thread is provided between the switch shaft 106 and the decompression housing 101. The decompression shaft 102 decompresses the gas flowing out of the high-pressure channel 103 by throttling, so that the gas contacted by the switch shaft 106 is low-pressure gas, thereby reducing the twisting resistance of the switch shaft 106, so that the user can easily twist the switch shaft 106, and realize the easy and stable switching of the oxygen supply valve.

[0031] Preferably, the diameter of the end of the decompression shaft 102 close to the high-pressure channel 103 is smaller than that of the middle part, and the diameter of the end in contact with the switch shaft 106 is larger, so that the decompression shaft 102 forms three sections with different diameters. The oxygen supply channel 105 is directly opposite to the side of the section with the smallest diameter, and the section with the largest diameter of the decompression shaft 102 is completely located in the decompression housing 101.

[0032] Preferably, a countersunk hole is provided at one end of the pressure reducing shaft 102 close to the high-pressure channel 103, and a plug 104 is provided in the countersunk hole. The thickness of the plug 104 is greater than the depth of the countersunk hole. The position of the plug 104 is opposite to the high-pressure channel 103 and the cross-sectional area of ​​the plug 104 is greater than the cross-sectional area of ​​the high-pressure channel 103, ensuring that the plug 104 can completely block the high-pressure channel 103.

[0033] Preferably, a flow limiter 9 is provided on the valve body, and the flow limiter 9 is located on the oxygen supply channel 105 between the lung function component 4 and the pressure reduction switch 1. The flow limiter 9 can adjust the oxygen flow rate so that the amount of oxygen supplied by the oxygen supply valve meets the actual needs of the user.

[0034] Preferably, a pressure gauge 2 , a safety valve 8 and an oxygen filling port 7 are also provided on the valve body of the oxygen supply valve, and the pressure gauge 2 , the safety valve 8 and the oxygen filling port 7 are all connected to the high-pressure channel 103 .

[0035] Preferably, the oxygen supply valve is further provided with an emergency switch 3 and an emergency channel, the emergency switch (3) is located on the emergency channel, the oxygen supply channel 105 and the emergency channel have two connection ports, the lung-type functional component is located on the oxygen supply channel between the two connection ports, that is, the lung-type oxygen supply component 4 and the emergency switch are in parallel relationship, when the lung-type oxygen supply component 4 fails, oxygen supply can also be achieved by opening the emergency switch 3, the emergency switch 3 comprises a locking pin 302, a fixing ring 303 and a handle 301, the oxygen supply valve is provided with a pin hole matching the locking pin 302, of the two connection ports, the connection port located upstream of the airflow is located in the middle of the pin hole, and the connection port located downstream of the airflow is located at the bottom of the pin hole, the locking pin 302 is provided with an upper shaft shoulder 304, The middle shoulder 305 and the lower shoulder 306, when the locking pin 302 is vertically arranged, a first sealing ring 308 is arranged above the upper shoulder 304, and a second sealing ring 307 is arranged between the middle shoulder 305 and the lower shoulder 306. The locking pin 302 has two matching positions in the valve body, namely a locking position and an opening position. When the locking pin 302 is in the locking position, the air source through hole is located between the first sealing ring 308 and the second sealing ring 307. When the locking pin 302 is in the opening position, the air source through hole and the air source outlet are located on the same side of the second sealing ring 307. The fixing ring 303 is fixedly connected to the pin hole, and the top of the locking pin 302 passes through the middle of the fixing ring 303, and the passing part is fixedly connected to the handle 301.

[0036] Preferably, the pin hole includes a large diameter section and a small diameter section, the diameter of the upper shoulder 304 is the same between the large diameter sections, the diameters of the middle shoulder 305 and the lower shoulder 306 are the same as the diameter of the small diameter section, and the connection port located upstream of the airflow is located on the side wall of the large diameter section. When the pin shaft is in a locked state, the two end faces of the upper shoulder 304 and the middle shoulder 305 are subjected to the same air pressure, while the upper end face of the lower shoulder 306 is subjected to the pressure from the second sealing ring 307, so that the lock pin 302 is always subjected to downward air pressure. At this time, a certain force needs to be applied to lift the handle 301 upward to move the lock pin 302 upward, thereby ensuring the stability of the lock pin 302 in the locked position. When the lock pin 302 is in the open position, the lock pin 302 will be affected by the airflow when it moves downward, and a certain force needs to be applied to press the lock pin 302 downward. This avoids the change in the position of the lock pin 302 due to an unexpected slight collision.

[0037] Preferably, the oxygen supply nozzle 6 and the negative pressure nozzle 5 are located on a transparent shell 12, and the transparent shell 12 is fixedly connected to the valve body of the oxygen supply valve. A float 13 is provided in the oxygen supply channel 105 on the transparent shell 12 that is connected to the oxygen supply nozzle 6, and limiting structures are provided on both sides of the oxygen supply channel 105 on the transparent shell 12. The oxygen supply channel 105 in the transparent shell 12 is vertically arranged, and the bottom end of the oxygen supply channel 105 in the transparent shell 12 is connected to the oxygen supply channel 105 in the oxygen supply valve, and the top end is connected to the oxygen supply interface.

[0038] Preferably, a scale can be set on the transparent shell 12, and the oxygen supply status can be directly judged by observing the jumping height of the float 13. When the negative pressure formed by the user's breathing is very low, the oxygen supply will also be very small, so the impact of the oxygen flow on the float is low, and the jumping height of the float is significantly reduced. Therefore, the jumping height of the float can intuitively judge the strength of the user's breathing. By observing the frequency of the float 13, it is possible to intuitively understand whether the frequency of oxygen supply is normal, which can be used as a real-time monitoring of the lung-type oxygen supply component.

[0039] Preferably, the limiting structures on both sides of the float 13 are respectively located on the upper and lower sides of the float 13, and the limiting structure located on the lower side is a reduced diameter section 14 formed by reducing the diameter of a section of the oxygen supply channel 105, and the transition surface between the top of the reduced diameter section 14 and the normal oxygen supply channel 105 is any one of an arc surface or a conical surface. When airflow passes through, the float 13 will inevitably be blown up by the airflow. In order to allow the airflow to pass, the oxygen supply nozzle 6 can be set in the middle of the oxygen supply channel 105. When oxygen flows, the float 13 is located in the upper part of the oxygen supply channel 105 under the action of the airflow, or the diameter of the float 13 is set to be smaller than the diameter of the oxygen supply channel 105 to ensure that the float 13 will not block the flow of oxygen. The arc surface matches the shape of the float 13, and the limiting structure located on the upper side is any one of a protrusion or a mesh set in the oxygen supply channel 105. When the oxygen supply interface is connected to the top of the channel where the float ball 13 is located, a convex block or a mesh needs to be arranged in the oxygen supply channel 105 to prevent the float ball 13 from blocking the oxygen supply nozzle 6 .

Claims

1. An oxygen supply valve that is convenient for regulating flow, characterized in that: The invention comprises a gas cylinder interface (10), a lung function component (4), a pressure reducing switch (1), a negative pressure nozzle (5) and an oxygen supply nozzle (6), wherein the oxygen supply valve is connected to the oxygen cylinder via the gas cylinder interface (10), an oxygen supply channel (105) is arranged in the oxygen supply valve, the pressure reducing switch (1) and the oxygen supply nozzle (6) are both in communication with the oxygen supply channel (105), the oxygen supply nozzle (6) is located at the end of the oxygen supply channel (105), the lung function component (4) is arranged on the oxygen supply channel (105) between the pressure reducing switch (1) and the oxygen supply nozzle (6), and the pressure sensing interface of the lung function component (4) is in communication with the negative pressure nozzle (5) for controlling the opening and closing of the oxygen supply channel (105); The oxygen supply valve is also provided with an emergency switch (3) and an emergency channel. The emergency switch (3) is located on the emergency channel. The oxygen supply channel (105) and the emergency channel have two connection ports. The lung function component is located on the oxygen supply channel between the two connection ports. The emergency switch (3) comprises a locking pin (302), a fixing ring (303) and a handle (301). The oxygen supply valve is provided with a pin hole matching the locking pin (302). Of the two connection ports, the connection port located upstream of the airflow is located in the middle of the pin hole, and the connection port located downstream of the airflow is located at the bottom of the pin hole. The locking pin (302) is provided with an upper shaft shoulder (304), a middle shaft shoulder (305) and a lower shaft shoulder (306). When the locking pin (302) is vertically arranged, A first sealing ring (308) is arranged above the upper shaft shoulder (304), and a second sealing ring (307) is arranged between the middle shaft shoulder (305) and the lower shaft shoulder (306). The locking pin (302) has two matching positions in the valve body, namely a locking position and an opening position. When the locking pin (302) is in the locking position, the air source through hole is located between the first sealing ring (308) and the second sealing ring (307). When the locking pin (302) is in the opening position, the air source through hole and the air source outlet are located on the same side of the second sealing ring (307). The fixing ring (303) is fixedly connected to the pin hole. The top of the locking pin (302) passes through the middle of the fixing ring (303), and the passing part is fixedly connected to the handle (301).

2. The oxygen supply valve for easy flow control according to claim 1, characterized in that: The pulmonary function component (4) is any one of a diaphragm or a diaphragm box.

3. The oxygen supply valve for easy flow control according to claim 1, characterized in that: The decompression switch (1) comprises a decompression shaft (102), a decompression housing (101), a switch shaft (106) and a switch handle (107); an axial hole is provided on the valve body of the oxygen supply valve, the axial hole is communicated with the gas cylinder interface (10); a section of the oxygen supply channel (105) between the axial hole and the gas cylinder interface (10) is a high-pressure channel (103); the high-pressure channel (103) is coaxial with the axial hole; one end of the decompression shaft (102) is inserted into the axial hole; a gap exists between the decompression shaft (102) and the axial hole; a connection port of the oxygen supply channel (105) between the axial hole and the oxygen supply nozzle (6) is located on the side wall of the axial hole; the other end of the oxygen supply channel (105) is connected to the oxygen supply nozzle (6) by a pressure relief valve. Located in a decompression housing (101), the decompression housing (101) is fixedly connected to the valve body, a step hole is provided in the decompression housing (101), a step matching the step hole is provided on the switch shaft (106), one end of the switch shaft (106) abuts against the decompression shaft (102), and the other end is located outside the decompression housing (101), the end with a larger diameter of the step hole is located on a side close to the decompression shaft (102), a switch handle (107) is fixed to the end of the switch shaft (106) located outside the decompression housing (101), and a transmission thread is provided between the switch shaft (106) and the decompression housing (101).

4. The oxygen supply valve for convenient flow control according to claim 3, characterized in that: A countersunk hole is provided at one end of the pressure reducing shaft (102) close to the high-pressure channel (103), a plug (104) is provided in the countersunk hole, the thickness of the plug (104) is greater than the depth of the countersunk hole, the position of the plug (104) is directly opposite to the high-pressure channel (103), and the cross-sectional area of ​​the plug (104) is greater than the cross-sectional area of ​​the high-pressure channel (103).

5. The oxygen supply valve for easy flow control according to claim 1, characterized in that: A flow limiter (9) is provided on the oxygen supply valve, and the flow limiter (9) is located on the oxygen supply channel (105) between the lung function component (4) and the pressure reduction switch (1).

6. The oxygen supply valve for easy flow control according to claim 3, characterized in that: A pressure gauge (2), a safety valve (8) and an oxygen filling port (7) are also provided on the valve body of the oxygen supply valve, and the pressure gauge (2), the safety valve (8) and the oxygen filling port (7) are all in communication with the high-pressure channel (103).

7. The oxygen supply valve for easy flow control according to claim 1, characterized in that: The pin hole comprises a large diameter section and a small diameter section, the diameter of the upper shaft shoulder (304) is the same as that of the large diameter section, the diameters of the middle shaft shoulder (305) and the lower shaft shoulder (306) are the same as that of the small diameter section, and the connection port located upstream of the airflow is located on the side wall of the large diameter section.

8. The oxygen supply valve for easy flow control according to claim 1, characterized in that: The oxygen supply nozzle (6) and the negative pressure nozzle (5) are located on a transparent shell (12); the transparent shell (12) is fixedly connected to the valve body of the oxygen supply valve; a float (13) is arranged in the oxygen supply channel (105) on the transparent shell (12) which is connected to the oxygen supply nozzle (6); both sides of the oxygen supply channel (105) on the transparent shell (12) are provided with limiting structures; the oxygen supply channel (105) in the transparent shell (12) is arranged vertically; the bottom end of the oxygen supply channel (105) in the transparent shell (12) is connected to the oxygen supply channel (105) in the oxygen supply valve, and the top end is connected to the oxygen supply interface.

9. The oxygen supply valve for convenient flow control according to claim 8, characterized in that: The limiting structures on both sides of the float (13) are respectively located on the upper side and the lower side of the float (13); the limiting structure located on the lower side is a reduced diameter section (14) formed by reducing the diameter of a section of the oxygen supply channel (105); the transition surface between the top of the reduced diameter section (14) and the normal oxygen supply channel (105) is either an arc surface or a conical surface, and the arc surface matches the shape of the float (13); the limiting structure located on the upper side is either a convex block or a mesh provided in the oxygen supply channel (105).

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