Combined air breathing equipment and use method thereof

Abstract

The invention discloses combined air breathing equipment and a using method thereof. The air breathing equipment comprises a breathing mask, and the side face of the breathing mask is connected with an air inlet back plate through a corrugated air guide pipe; a filtering device is arranged at the input end of the air inlet back plate, and an air supply fan is arranged in the air inlet back plate; the compressed air bottle is arranged on the back side of the air inlet back plate; a control valve, an air supply valve and an air path valve which are used for controlling output of the compressed air bottle are arranged on the oxygen supply branch and the oxygen supply branch and located at the corrugated air guide pipe, a control circuit board is arranged at the air path valve, and the control circuit board is electrically connected with the air supply valve, the air path valve, the control valve of the compressed air bottle and the air supply fan through linkage wires. Therefore, synchronous switching and interlocking of three oxygen supply modes, namely a PAPR mode, an APR mode and an SCBA mode, are realized. By means of the linkage design of the air supply valve and the air path valve, rescue workers can complete switching from air bottle oxygen supply to canister oxygen supply within two seconds, and the response speed is greatly increased.

Description

Technical Field

[0001] This invention relates to a combined air breathing device and its method of use. Background Technology

[0002] In work environments involving toxic or hazardous gases, such as emergency response and hazardous gas detection, especially in high-risk operations like firefighting and rescue, the health and safety of workers are paramount. In these environments, workers must wear breathing apparatus to ensure respiratory safety.

[0003] Traditional devices require separate control of multiple gas lines, such as oxygen supply from gas cylinders and air supply from filter canisters. The operation is complex, the response speed is slow in emergencies, and it is easy to cause oxygen supply failure or gas mixing due to misoperation, which directly endangers the safety of rescue personnel.

[0004] Meanwhile, its simple sealing structure means that the breathing hole cannot be completely closed in the oxygen supply mode, causing continuous oxygen leakage and reducing oxygen supply efficiency. At the same time, it lacks effective physical isolation when switching gas circuits, and the gas in the gas cylinder is easily mixed with the external ambient air, which wastes oxygen resources and affects the stability of oxygen supply.

[0005] Therefore, a combined air breathing device and its usage method are proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a combined air breathing device and its usage method to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a combined air breathing device, comprising: A breathing mask, the side of which is connected to an air inlet backplate via a corrugated air duct; The air intake back panel has a filter at its input end and an air supply fan inside. A compressed air cylinder is located on the back side of the air intake back plate; The oxygen supply branch has one end connected to the output end of the compressed air cylinder, and the other end extending into the corrugated air guide pipe and connected to the air passage valve; a control valve for controlling the output of the compressed air cylinder is installed in the oxygen supply branch at the corrugated air guide pipe. An air supply valve is located at the front end of the breathing mask. The air supply valve includes an air supply base plate, a valve cover is provided on the air supply base plate, and a breathing hole is provided on the air supply base plate. The breathing hole is connected to the corrugated air guide tube through the breathing mask. A breathing diaphragm is provided on the breathing hole, and a press-and-rotate valve button assembly for controlling the opening and closing of the breathing hole is provided on the breathing diaphragm. An airway valve is located at the connection between the breathing mask and the corrugated airway tube, and is used as a control knob assembly for switching between the oxygen supply branch and the two airways of the corrugated airway tube. A control circuit board is installed at the gas valve. The control circuit board is electrically connected to the gas supply valve, the gas valve, the control valve of the compressed air cylinder, and the blower through linkage wires to realize the synchronous switching and interlocking of three oxygen supply modes: PAPR mode, APR mode, and SCBA mode. The air passage valve is equipped with a control magnet and three Hall switches that cooperate with the control magnet. The three Hall switches correspond to the PAPR mode position, APR mode position and SCBA mode position respectively. The control magnet is fixed to the rotating part of the air passage knob by a fixing plate and can rotate synchronously with the air passage knob to trigger the electrical signal of the corresponding mode through the Hall switches.

[0008] Preferably, the press-and-rotate valve assembly includes a transmission cylinder that is circumferentially engaged with the air supply knob. The inner wall of the air supply knob is provided with internal teeth, and the top end of the transmission cylinder is provided with meshing teeth, so that when the air supply knob is pressed down, the internal teeth engage with the meshing teeth to achieve rotational drive. A first return spring is provided between the air supply knob and the transmission cylinder. When the air supply knob is released, the first return spring lifts the air supply knob to separate the internal teeth from the meshing teeth.

[0009] Preferably, a follower cylinder is sleeved inside the transmission cylinder, and the follower cylinder is located on the upper wall side of the valve cover. The inner wall of the transmission cylinder is provided with wedge-shaped arc teeth; The outer wall of the follower cylinder is provided with a wedge-shaped arc plate that mates with the wedge-shaped arc teeth. A connecting rod is inserted through the middle of the follower cylinder, and a sealing plate is provided at the bottom end of the connecting rod. The sealing plate is directly opposite the breathing hole, and a second return spring is provided between the sealing plate and the valve cover. When the air supply knob is pressed and rotated, the transmission cylinder connecting the wedge-shaped arc teeth slides along the inclined surface of the wedge arc plate, pushing the follower cylinder to move down. The second reset spring squeezes the sealing plate to press the breathing diaphragm to close the breathing hole through elasticity.

[0010] Preferably, a third return spring is provided between the follower cylinder and the valve cover to allow the follower cylinder to move elastically on the valve cover.

[0011] Preferably, a transmission gear is provided at the lower part of the transmission cylinder, and a driven gear is provided next to the transmission gear and meshing with it. The driven gear is provided with a switch mark for indicating the opening and closing status of the breathing hole, so that the transmission cylinder is connected to the driven gear to control the switch mark to move accordingly. The input end of the driven gear is connected to the output end of the control motor, and the input end interface of the control motor is connected to the air circuit valve through a linkage wire; The control motor is electrically connected to the three Hall switches via wires. The control motor is also capable of responding to the rotation of the air supply knob and driving the air path knob to rotate to the SCBA mode position.

[0012] Preferably, the control valve assembly includes a regulating valve seat disposed at the output end of the corrugated air guide pipe. The regulating valve seat has an inner liner located at the output end of the oxygen supply branch. An air outlet is provided at the upper part of the inner liner and communicates with the corrugated air guide pipe. A cover plate is provided on the upper part of the regulating valve seat, and an air passage knob is provided above the cover plate. The inner wall of the air passage knob is provided with a wedge-shaped guide plate. A drive disc is located below the air passage knob, and a guide block that cooperates with the wedge-shaped guide plate is provided on the outer periphery of the drive disc. A fourth return spring is provided between the drive disc and the cover plate. The drive disc is connected to the closed disc via an adjusting rod. The outer periphery of the closed disc is connected to a diaphragm. The closed disc is directly opposite the air outlet of the inner liner and is provided with a sealing spring between it and the cover plate. When the air circuit knob is pressed and rotated, the wedge-shaped guide plate squeezes the guide block, causing the drive disc to move downward. The closing disc, under the action of the sealing spring, presses the air outlet to close the oxygen supply branch.

[0013] Preferably, a venting cylinder is fitted inside the inner liner, and the venting cylinder is connected to the air outlet cylinder. An air pressure regulating spring is installed inside the air outlet cylinder. An adjusting bolt is installed on the side of the air pressure regulating spring away from the air outlet cylinder, and a threaded adjusting post is installed on the side of the adjusting bolt away from the air pressure regulating spring. The rotary adjusting bolt changes the compression of the air pressure regulating spring to adjust the opening pressure of the ventilator.

[0014] Preferably, the output end of the corrugated gas guide tube of the gas valve is provided with a delivery port, and a one-way diaphragm is provided at the delivery port. When the oxygen supply branch is opened, the gas pressure in the regulating valve seat increases and pushes the one-way diaphragm to block the delivery port, thereby achieving physical isolation between the gas in the gas cylinder and the gas being delivered.

[0015] Preferably, an air supply fan is provided at the air intake back panel, and a control knob for manually setting the power is provided at the air supply fan. The control knob is electrically connected to the control circuit board. The filtration device includes two sets of filter canisters located at the input end of the air inlet backplate, so that the air supply fan can deliver filtered air through the filter canisters to the breathing mask via a corrugated air duct; the three Hall switches are arranged in a circular arc on the air circuit valve regulating seat, corresponding to the PAPR mode position, APR mode position and SCBA mode position respectively, with an installation angle interval of 30°, corresponding to the three stable working positions of the air circuit knob rotated to 0°, 30° and 60° respectively; A Hall switch is located below the air passage knob, and a Hall element is located below the Hall switch, so that the air passage knob can control the Hall switch to open and close. The linkage wire electrically connects the air supply fan, control motor, Hall switch, control valve and control circuit board; The blower is electrically connected to the Hall switch corresponding to the PAPR mode position, so that the output signal of the Hall switch can directly control the start and stop of the blower.

[0016] Preferably, a method of using a combined air breathing device includes the following steps: Step A: Start SCBA mode (Method A) A1. Press the air supply knob of the air supply valve. The air supply knob moves downward in the transmission cylinder through the connecting cylinder and compresses the first return spring until the internal teeth of the inner wall of the air supply knob engage with the meshing teeth at the top of the transmission cylinder, forming a rotary drive connection. A2. Rotate the air supply knob clockwise. The engagement of the internal teeth and the meshing teeth drives the transmission cylinder to rotate. The wedge-shaped arc teeth on the inner wall of the transmission cylinder abut down along the inclined surface of the wedge-shaped arc plate on the outer wall of the follower cylinder, pushing the follower cylinder to move down to the bottom. At this time, the bottom of the wedge-shaped arc teeth engages in the arc-shaped groove at the top of the wedge-shaped arc plate to achieve positioning. A3. During the downward movement of the follower cylinder, the transmission gear at the bottom of the transmission cylinder rotates synchronously, driving the driven gear meshing with it to rotate, causing the switch mark on the driven gear to gradually rotate to the valve cover window, indicating that the breather hole is in the closed state; A4. The transmission cylinder moves down and compresses the second return spring. At the same time, the force between the bottom of the transmission cylinder and the connecting rod is lost. The third return spring stretches elastically and pushes the sealing plate to press the breathing diaphragm, so that the breathing diaphragm completely seals the breathing hole, realizing a closed environment for oxygen supply from the gas cylinder. A5. When the breather hole of the gas supply valve is closed, the linkage wire triggers an electrical signal to the Hall switch of the gas circuit valve, and the control magnet triggers the Hall switch in the SCBA mode position to output a third electrical signal, opening the control valve at the oxygen supply branch and setting it to the oxygen supply position of the gas cylinder. The gas in the compressed air cylinder is output to the ventilation cylinder through the oxygen supply branch. The gas pressure acts on the ventilation cylinder, and the ventilation cylinder moves towards the outlet cylinder side under force and compresses the gas pressure regulating spring until a gap is created between the ventilation cylinder and the oxygen supply branch. The gas is output to the outlet of the inner liner cylinder through the gap. A6. After the compressed air cylinder gas enters the regulating valve seat, the internal air pressure of the regulating valve seat increases, which squeezes the one-way diaphragm to the delivery port position, sealing the delivery port and achieving physical isolation between the gas in the cylinder and the gas in the delivery pipe. A7. The gas output from the oxygen supply branch is finally delivered to the breathing mask through the outlet, completing the activation of the cylinder oxygen supply mode; Step B: Start SCBA mode B; B1. Press the air circuit knob of the air circuit valve to move the wedge-shaped guide plate on its inner wall down and fit against the inclined surface of the guide block on the side of the drive disc connecting column; B2. Rotate the air passage knob clockwise. The wedge-shaped guide plate presses the guide block downward through the inclined surface until the arc-shaped groove at the bottom of the wedge-shaped guide plate engages with the guide block side. The drive plate moves down and compresses the fourth reset spring. At this time, the sealing spring elastically elongates and presses the closing plate against the air outlet of the inner liner, thus achieving mechanical sealing of the air outlet. B3. Rotating the air circuit knob controls the interaction between the magnet and the Hall element. The magnet triggers the Hall switch in the SCBA mode position to output a third electrical signal. The Hall switch opens the control valve at the oxygen supply branch, placing it in the oxygen supply position of the gas cylinder. At the same time, the control motor is connected via the linkage wire, which drives the driven gear switch mark to rotate, displaying the status of the breathing hole through the window on the valve cover. B4. The gas in the cylinder is output to the ventilation cylinder through the oxygen supply branch. The gas pressure acts on the ventilation cylinder, and the ventilation cylinder moves towards the outlet cylinder side under force and compresses the gas pressure regulating spring until a gap is created between the ventilation cylinder and the oxygen supply branch. The gas is output to the outlet of the inner liner cylinder through the gap. B5. After the compressed air cylinder gas enters the regulating valve seat, the internal air pressure of the regulating valve seat increases, which squeezes the one-way diaphragm to the delivery port position, sealing the delivery port and achieving physical isolation between the gas in the cylinder and the gas in the delivery pipe. B6. The gas output from the oxygen supply branch is finally output to the breathing mask through the air outlet, completing the start of the gas cylinder oxygen supply mode. Step C: Switch to APR mode and inhale naturally from the filter canister. C1. Press the air circuit knob of the air circuit valve again to move the wedge-shaped guide plate on its inner wall down and fit against the inclined surface of the guide block on the side of the drive disc connecting column; C2. Rotate the air passage knob counterclockwise. The wedge-shaped guide plate moves out of the arc-shaped groove. The fourth reset spring stretches elastically and lifts the drive plate. The drive plate moves up and drives the adjusting rod to move up. The closing plate at the bottom of the adjusting rod moves up and compresses the sealing spring, so that the closing plate is separated from the air outlet and the blockage of the air outlet is released. C3. When the air outlet is open, the Hall switch triggers an electrical signal that is fed back to the control circuit board. The control magnet triggers the Hall switch in the APR mode position to output a second electrical signal. The control circuit board controls the gas cylinder control valve to close and controls the motor to run through the electrical signal. The motor drives the driven gear to rotate in the opposite direction, causing the switch mark to turn out from the valve cover window, and the window shows that the breathing hole is open. At the same time, the driven gear meshes with the transmission gear and rotates in the opposite direction, and the connecting transmission cylinder rotates in the opposite direction. The wedge-shaped guide plate moves out from the upper end of the connecting column through the arc groove. The second reset spring elastically extends and lifts the drive plate. The drive plate moves up through the limit protrusion and the adjusting rod, driving the closing plate to move out from the air outlet of the inner liner. At the same time, the covering diaphragm bulges, releasing the blockage of the air outlet. At this time, the user breathes naturally and the air is delivered through the filter canister to the breathing mask side, realizing the supply of air to the filter canister. Step D: Switch to PAPR mode for active air supply: D1. Reverse rotation of the air circuit valve's air circuit knob causes the wedge-shaped guide plate to move out from the upper end of the connecting column through the arc-shaped groove. The second return spring elastically extends and lifts the drive plate. The drive plate moves upward through the limit protrusion connected to the adjusting rod, causing the closed plate to move out from the air outlet of the inner liner. At the same time, the covering diaphragm bulges, releasing the blockage of the air outlet. Simultaneously, the rotation of the air circuit knob controls the magnet and Hall element to act, controlling the operation of the air supply fan through the Hall switch. The control valve at the oxygen supply branch is closed and placed in the active air supply position. D2. The Hall switch of the PAPR mode position triggered by the control magnet outputs the first electrical signal. The first electrical signal drives the air supply fan to start, and the air filtered by the filter canister is blown through the corrugated air duct. The one-way diaphragms on both sides of the corrugated air duct are blown up, the delivery port is opened, and the air is delivered to the breathing mask, thus completing the switching of the oxygen supply mode of the filter canister. Step E: Adjust the gas cylinder output pressure: E1. When it is necessary to increase the output pressure of the gas cylinder, rotate the threaded adjusting column on the adjusting bolt side to control the adjusting bolt to move inward to the air outlet cylinder. The moving adjusting bolt squeezes the air pressure adjusting spring, increasing the contact force between the air inlet cylinder and the air outlet cylinder, so that the required output pressure of the compressed air cylinder is increased. E2. When it is necessary to reduce the output pressure of the gas cylinder, rotate the threaded adjusting column on the adjusting bolt side in the opposite direction to control the adjusting bolt to move outward of the air outlet. The air pressure adjusting spring will extend relatively, reducing the contact force between the air inlet and outlet, thereby reducing the required output pressure of the compressed air cylinder.

[0017] In the above technical solution, the combined air breathing device and its usage method provided by the present invention have the following beneficial effects: By linking the gas supply valve and the gas circuit valve, the traditional multi-step, step-by-step control method is simplified to a single valve button operation, significantly reducing the number of steps. For example, in an emergency, rescuers can switch from cylinder oxygen supply to filter canister oxygen supply within 2 seconds, greatly improving response speed.

[0018] It adopts a dual-action mechanism of pressing and rotating, combined with a three-stage reset spring, to automatically reset and separate, effectively avoiding oxygen supply failure or gas mixing caused by misoperation, reducing the misoperation rate by more than 90%.

[0019] The gas supply valve uses a wedge-shaped arc tooth and arc plate drive to convert rotational motion into linear clamping force of the sealing disc, which, together with the breathing diaphragm, achieves zero-leakage closure of the breathing hole. This design significantly improves airtightness, increases oxygen utilization by 30%-40%, and extends the service life of the gas cylinder.

[0020] The gas valve is equipped with a one-way diaphragm that automatically seals the delivery port when the gas cylinder is supplying gas, achieving mechanical interlocking isolation between the gas in the gas cylinder and the gas in the filter canister, preventing gas backflow and mixing, and ensuring 100% purity of the supplied gas.

[0021] The Hall effect switch is controlled by an electrical signal transmitted through a linkage wire. This, combined with the mechanical isolation of the unidirectional diaphragm, ensures that the three modes of oxygen supply—cylinder oxygen supply, filter canister oxygen supply, and active ventilation—cannot be activated simultaneously. This dual interlocking mechanism significantly improves the system's reliability.

[0022] The driven gear drives the switch mark to display the open / closed status of the breather hole in the valve cover window, allowing the operator to intuitively confirm the current mode and avoid misjudgment of the mode.

[0023] By rotating the threaded adjusting column to change the compression of the air pressure regulating spring, the output pressure of the gas cylinder can be steplessly adjusted on-site. This design can flexibly adjust the oxygen supply pressure according to different work intensities (such as sitting, walking, and high-intensity rescue), meeting diverse needs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the gas cylinder delivery pipe structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the gas supply valve structure provided in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the air supply valve provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the gas supply valve structure separation provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the sectional view of the gas supply valve structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the gas valve structure provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure of the gas valve provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the pneumatic valve drive disc structure provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the wedge-shaped guide plate structure of the air passage valve provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the stripping of the bellows-shaped air guide tube of the air passage valve provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the cross-sectional structure of the gas valve provided in an embodiment of the present invention; Figure 13 This is a schematic diagram of the internal structure of the regulating valve seat provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the conveying port structure provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached diagram: 1. Breathing mask; 2. Corrugated air duct; 3. Air inlet backplate; 4. Compressed air cylinder; 5. Oxygen supply branch; 6. Control valve; 7. Air supply valve; 71. Air supply seat plate; 72. Valve cover; 73. Breathing diaphragm; 74. Breathing port; 75. Press-to-rotate valve assembly; 751. Air supply knob; 752. Transmission cylinder; 7521. Meshing gear; 753. Internal gear; 754. First return spring; 755. Follower cylinder; 756. Wedge-shaped arc tooth; 757. Wedge-shaped arc plate; 758. Connecting rod; 759. Sealing disc; 7510. Second return spring; 7511. Third return spring; 7512. Transmission gear; 7513. Driven gear; 7514. Control motor; 8. 81. Air circuit valve; 82. Control circuit board; 83. Control valve knob assembly; 84. Adjusting valve seat; 85. Inner liner; 86. Air outlet; 87. Cover plate; 88. Air circuit knob; 89. Wedge guide plate; 80. Drive disc; 810. Guide block; 821. Fourth return spring; 8210. Adjusting rod; 8211. Closing disc; 8212. Composite diaphragm; 8213. Sealing spring; 8214. Ventilation cylinder; 8215. Air outlet; 8216. Air pressure regulating spring; 8217. Adjusting bolt; 8218. Threaded adjusting column; 8219. Hall switch; 8220. Delivery port; 8221. One-way diaphragm; 9. Linkage wire; 10. Air supply fan; 11. Filter canister. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Please see Figure 1-14 This invention provides a technical solution: a combined air breathing device, comprising: Breathing mask 1, the side of which is connected to air inlet back plate 3 via corrugated air duct 2; The air intake back panel 3 has a filter device at its input end and an air supply fan 10 inside it. Compressed air cylinder 4 is disposed on the back side of the air inlet back plate 3; Oxygen supply branch 5 has one end connected to the output end of the compressed air cylinder 4, and the other end extends into the corrugated air guide pipe 2 and is connected to the air passage valve 8; a control valve 6 for controlling the output of the compressed air cylinder 4 is provided at the corrugated air guide pipe 2 in the oxygen supply branch 5. An air supply valve 7 is located at the front end of the breathing mask 1. The air supply valve 7 includes an air supply base plate 71, a valve cover 72 is provided on the air supply base plate 71, a breathing hole 74 is provided on the air supply base plate 71, the breathing hole 74 is connected to the corrugated air guide tube 2 through the breathing mask 1, a breathing diaphragm 73 is provided on the breathing hole 74, and a press-rotary valve button assembly 75 for controlling the opening and closing of the breathing hole 74 is provided on the breathing diaphragm 73. The airway valve 8 is located at the connection between the breathing mask 1 and the corrugated air duct 2, and is used as a control knob assembly for switching between the two airways, oxygen supply branch 5 and corrugated air duct 2. A control circuit board 81 is provided at the gas valve 8. The control circuit board 81 is electrically connected to the gas supply valve 7, the gas valve 8, the control valve 6 of the compressed air cylinder 4, and the air blower 10 through the linkage wire 9 to realize the synchronous switching and interlocking of three oxygen supply modes: PAPR mode, APR mode and SCBA mode. The air valve 8 is equipped with a control magnet 826 and three Hall switches 8219 that cooperate with the control magnet 826. The three Hall switches 8219 correspond to the PAPR mode position, APR mode position and SCBA mode position respectively. The control magnet 826 is fixed to the rotating part of the air circuit knob 825 by a fixing plate and can rotate synchronously with the air circuit knob 825 to trigger the electrical signal of the corresponding mode through the Hall switches 8219.

[0029] The press-and-rotate valve assembly 75 includes a transmission cylinder 752 that is circumferentially engaged with the air supply knob 751. The inner wall of the air supply knob 751 is provided with internal teeth 753, and the top end of the transmission cylinder 752 is provided with meshing teeth 7521, so that when the air supply knob 751 is pressed down, the internal teeth 753 engage with the meshing teeth 7521 to achieve rotational drive. A first return spring 754 is provided between the air supply knob 751 and the transmission cylinder 752. When the air supply knob 751 is released, the first return spring 754 lifts the air supply knob 751 to separate the internal teeth 753 from the meshing teeth 7521.

[0030] A follower cylinder 755 is sleeved inside the transmission cylinder 752. The follower cylinder 755 is located on the upper wall side of the valve cover 72. The inner wall of the transmission cylinder 752 is provided with wedge-shaped arc teeth 756. The outer wall of the follower cylinder 755 is provided with a wedge-shaped arc plate 757 that cooperates with the wedge-shaped arc teeth 756. A connecting rod 758 passes through the middle of the follower cylinder 755. A sealing disc 759 is provided at the bottom end of the connecting rod 758. The sealing disc 759 is directly opposite the breather hole 74. A second return spring 7510 is provided between the sealing disc 759 and the valve cover 72. When the air supply knob 751 is pressed and rotated, the transmission cylinder 752 connected to the wedge-shaped arc teeth 756 slides along the inclined surface of the wedge-shaped arc plate 757, pushing the follower cylinder 755 downward. The second return spring 7510 compresses the sealing disc 759 with elastic force to press the breather diaphragm 73 to close the breather hole 74.

[0031] A third return spring 7511 is provided between the follower cylinder 755 and the valve cover 72 to allow the follower cylinder 755 to move elastically on the valve cover 72. A transmission gear 7512 is provided at the lower part of the transmission cylinder 752, and a driven gear 7513 is provided next to the transmission gear 7512 and meshes with it. The driven gear 7513 is provided with a switch mark for indicating the opening and closing status of the breather hole 74, so that the transmission cylinder 752 connects to the driven gear 7513 to control the switch mark to move accordingly. The input end of the driven gear 7513 is connected to the output end of the control motor 7514, and the input end interface of the control motor 7514 is connected to the air circuit valve 8 through the linkage wire 9. The control motor 7514 is electrically connected to the three Hall switches 8219 via wires. The control motor 7514 is also capable of driving the air circuit knob 825 to rotate to the SCBA mode position in response to the rotation operation of the air supply knob 751.

[0032] The control valve assembly 82 includes a regulating valve seat 821 disposed at the output end of the corrugated air guide pipe 2. The regulating valve seat 821 has an inner liner 822 located at the output end of the oxygen supply branch 5. An air outlet 823 is provided on the upper part of the inner liner 822, and the air outlet 823 is connected to the corrugated air guide pipe 3. A cover plate 824 is provided on the upper part of the regulating valve seat 821, and an air passage knob 825 is provided above the cover plate 824. A wedge-shaped guide plate 826 is provided on the inner wall of the air passage knob 825. A drive disk 827 is provided below the air passage knob 825, and a guide block 828 that cooperates with the wedge-shaped guide plate 826 is provided on the outer periphery of the drive disk 827. A fourth return spring 829 is provided between the drive disk 827 and the cover plate 824. The drive disc 827 is connected to the closed disc 8211 via the adjusting rod 8210. The outer periphery of the closed disc 8211 is connected to the composite diaphragm 8212. The closed disc 8211 is directly opposite the air outlet 823 of the inner liner 822 and is provided with a sealing spring 8213 between it and the cover plate 824. When the air circuit knob 825 is pressed and rotated, the wedge-shaped guide plate 826 presses the guide block 828 to make the drive disc 827 move down, and the closing disc 8211 presses the air outlet 823 under the action of the sealing spring 8213 to close the oxygen supply branch 5.

[0033] The inner liner 822 is fitted with a ventilator 8214, which is connected to an outlet 8215. An air pressure regulating spring 8216 is installed inside the outlet 8215. An adjusting bolt 8217 is installed on the side of the air pressure regulating spring 8216 away from the outlet 8215, and a threaded adjusting post 8218 is installed on the side of the adjusting bolt 8217 away from the air pressure regulating spring 8216. Rotating the adjusting bolt 8217 changes the compression of the air pressure regulating spring 8216 to adjust the opening pressure of the ventilator 8214.

[0034] The corrugated air guide tube 2 of the gas valve 8 is provided with a delivery port 8220. A one-way diaphragm 8221 is provided at the delivery port 8220. When the oxygen supply branch 5 is opened, the gas pressure in the regulating valve seat 821 increases and pushes the one-way diaphragm 8221 to block the delivery port 8220, thereby achieving physical isolation between the gas in the gas cylinder and the delivery gas.

[0035] A blower 10 is provided at the air intake back plate 3. The blower 10 is provided with a control knob for manually setting the power. The control knob is electrically connected to the control circuit board 81. The filtration device includes two sets of filter canisters 11 located at the input end of the air inlet backplate 3, so that the blower 10 delivers filtered air to the breathing mask 1 through the filter canisters 11 and the corrugated air duct 2. The three Hall switches 8219 are arranged in a circular arc on the regulating valve seat 821 of the airway valve 8, corresponding to the PAPR mode position, APR mode position and SCBA mode position respectively, with an installation angle interval of 30°, corresponding to the three stable working positions of the airway knob 825 when rotated to 0°, 30° and 60° respectively. The Hall switch 8219 is located below the airway knob 825, and a Hall element is located below the Hall switch 8219, so that the airway knob 825 controls the opening and closing of the Hall switch 8219. The linkage wire 9 electrically connects the air supply fan 10, the control motor 7514, the Hall switch 8219, the control valve 6, and the control circuit board 81; the air supply fan 10 is electrically connected to the Hall switch 8219 corresponding to the PAPR mode position, so that the output signal of the Hall switch 8219 can directly control the start and stop of the air supply fan 10.

[0036] A method of using a combined air breathing device includes the following steps: Step A: Start SCBA mode (Method A) A1. Press the air supply knob of the air supply valve 7. The air supply knob moves downward in the transmission cylinder 752 through the connecting cylinder and compresses the first return spring 754 until the inner teeth 753 of the inner wall of the air supply knob are engaged with the meshing teeth 7521 at the top of the transmission cylinder 752, forming a rotary drive connection. A2. Rotate the air supply knob clockwise. The engagement of the internal teeth 753 and the meshing teeth 7521 drives the transmission cylinder 752 to rotate. The wedge-shaped arc teeth 756 on the inner wall of the transmission cylinder 752 abuts downward along the inclined surface of the wedge-shaped arc plate 757 on the outer wall of the follower cylinder 755, pushing the follower cylinder 755 to move downward to the bottom. At this time, the bottom of the wedge-shaped arc teeth 756 is engaged in the arc-shaped groove at the top of the wedge-shaped arc plate 757 to achieve positioning. A3. During the downward movement of the follower cylinder 755, the transmission gear 7512 at the lower part of the transmission cylinder 752 rotates synchronously, driving the driven gear 7513 meshing with it to rotate, so that the switch mark on the driven gear 7513 gradually rotates to the window of the valve cover 72, indicating that the breather hole 74 is in the closed state. A4. The transmission cylinder 752 moves down and compresses the second return spring 7510. At the same time, the force between the bottom of the transmission cylinder 752 and the connecting rod 758 is lost. The third return spring 7511 stretches elastically and pushes the sealing plate 759 to press the breathing diaphragm 73, so that the breathing diaphragm 73 completely seals the breathing hole 74, realizing a closed environment for oxygen supply from the gas cylinder. A5. When the breather hole 74 of the gas supply valve 7 is closed, the linkage wire 9 triggers an electrical signal to the Hall switch 8219 of the gas circuit valve 8. The control magnet 826 triggers the Hall switch 8219 in the SCBA mode position to output a third electrical signal, opening the control valve 6 at the oxygen supply branch 5 and setting it to the gas cylinder oxygen supply position. The gas in the compressed air cylinder 5 is output to the ventilation cylinder 8214 through the oxygen supply branch 5. The gas pressure acts on the ventilation cylinder 8214, and the ventilation cylinder 8214 is forced to move towards the outlet cylinder 8215 and compress the air pressure regulating spring 8216 until a gap is created between the ventilation cylinder 8214 and the oxygen supply branch 5. The gas is output through the gap to the outlet 823 of the inner liner cylinder 822. A6. After the gas from compressed air cylinder 5 enters the regulating valve seat 821, the internal air pressure of the regulating valve seat 821 increases, which squeezes the one-way diaphragm 8221 to the position of the delivery port 8220, thus blocking the delivery port 8220 and achieving physical isolation between the gas from the gas cylinder and the gas from the delivery pipe. A7. The gas output from oxygen supply branch 5 is finally output to breathing mask 1 through outlet 823, completing the start of the gas cylinder oxygen supply mode; Step B: Start SCBA mode B; B1. Press the air circuit knob 825 of the air circuit valve 8 to move the wedge-shaped guide plate 826 on its inner wall down and fit against the inclined surface of the guide block 828 on the side of the drive disc 827 connecting column. B2. Rotate the air passage knob 825 clockwise. The wedge-shaped guide plate 826 presses the guide block 828 downward through the inclined surface until the arc-shaped groove at the bottom of the wedge-shaped guide plate 826 engages with the side of the guide block 828. The drive disc 827 moves down and compresses the fourth reset spring 829. At this time, the sealing spring 8213 elastically elongates and presses the closing disc 8211 against the air outlet 823 of the inner liner 822, thereby achieving mechanical sealing of the air outlet 823. B3. Rotating the air circuit knob 825 controls the interaction between the magnet and the Hall element. The control magnet 826 triggers the Hall switch 8219 in the SCBA mode position to output a third electrical signal. The Hall switch 8219 opens the control valve 6 at the oxygen supply branch 5, placing it in the oxygen supply position of the gas cylinder. At the same time, the control motor 7514 is connected to the linkage wire 9 to run, driving the driven gear 7513 to rotate the switch mark, displaying the status of the breathing hole 74 through the window at the valve cover 72. B4. The gas in the gas cylinder is output to the ventilation cylinder 8214 through the oxygen supply branch 5. The gas pressure acts on the ventilation cylinder 8214, and the ventilation cylinder 8214 moves towards the outlet cylinder 8215 and compresses the gas pressure regulating spring 8216 until a gap is created between the ventilation cylinder 8214 and the oxygen supply branch 5. The gas is output to the outlet 823 of the inner liner cylinder 822 through the gap. B5. After the gas from compressed air cylinder 5 enters the regulating valve seat 821, the internal air pressure of the regulating valve seat 821 increases, which squeezes the one-way diaphragm 8221 to the position of the delivery port 8220, blocking the delivery port 8220 and achieving physical isolation between the gas from the gas cylinder and the gas from the delivery pipe. B6. The gas output from oxygen supply branch 5 is finally output to breathing mask 1 through outlet 823, completing the start of cylinder oxygen supply mode. Step C: Switch to APR mode and inhale naturally from the filter canister. C1. Press the air circuit knob 825 of the air circuit valve 8 again, so that the wedge-shaped guide plate 826 on its inner wall moves down and fits against the inclined surface of the guide block 828 on the side of the drive disc 827 connecting column; C2. Rotate the air passage knob 825 counterclockwise. The wedge-shaped guide plate 826 moves out of the arc-shaped groove. The fourth return spring 829 stretches elastically and lifts the drive plate 827. The drive plate 827 moves upward and drives the adjusting rod 8210 to move upward. The closing plate 8211 at the bottom of the adjusting rod 8210 moves upward and compresses the sealing spring 8213, so that the closing plate 8211 disengages from the air outlet 823 and releases the blockage of the air outlet 823. C3. When the air outlet 823 is open, the Hall switch 8219 triggers an electrical signal that is fed back to the control circuit board 81. The control magnet 826 triggers the Hall switch 8219 in the APR mode position to output a second electrical signal. The control circuit board 81 controls the gas cylinder control valve 6 to close and controls the motor 7514 to run via the electrical signal. The motor 7514 drives the driven gear 7513 to rotate in the opposite direction, causing the switch mark to rotate out from the window of the valve cover 72, and the window shows that the breather 74 is in the open state. At the same time, the driven gear 7513 meshes with the transmission gear 7512. Reverse rotation causes the connecting transmission cylinder 752 to rotate in the opposite direction. The wedge-shaped guide plate 826 moves out from the upper end of the connecting column through the arc groove. The second return spring 7510 elastically extends and lifts the drive plate 827. The drive plate 827 moves upward through the limiting protrusion and the adjusting rod 8210, which drives the closed plate 8211 to move out from the air outlet 823 of the inner liner cylinder 822. At the same time, the covering diaphragm 8212 bulges up, releasing the blockage of the air outlet 823. At this time, the user breathes naturally and delivers air through the filter canister 11 to the breathing mask 1 side, thus supplying air to the filter canister 11. Step D: Switch to PAPR mode for active air supply: D1. The air circuit knob 825 of the reverse rotating air circuit valve 8, the wedge-shaped guide plate 826 moves out from the upper end of the connecting column through the arc groove, the second return spring 7510 elastically extends to lift the drive plate 827, the drive plate 827 moves up through the limit protrusion connected to the adjusting rod 8210, driving the closed plate 8211 to move out from the air outlet 823 of the inner liner cylinder 822, at the same time the covering diaphragm 8212 bulges up, releasing the blockage of the air outlet 823, at the same time the rotation of the air circuit knob 825 controls the magnet and the Hall element to act, and controls the operation of the air supply fan 10 through the Hall switch 8219, the control valve 6 at the oxygen supply branch 5 is closed and placed in the active air supply position; D2. The Hall switch 8219 of the PAPR mode position triggered by the control magnet 826 outputs the first electrical signal. The first electrical signal drives the air blower 10 to start, and the air filtered by the filter canister 11 is passed through the corrugated air duct 2. The one-way diaphragms 8221 on both sides of the corrugated air duct 2 are blown up, the delivery port 8220 is opened, and the air is delivered to the breathing mask 1, thus completing the switching of the oxygen supply mode of the filter canister 11. Step E: Adjust the gas cylinder output pressure: E1. When it is necessary to increase the output pressure of the gas cylinder, rotate the threaded adjusting pin 8218 on the side of the adjusting pin 8217 to control the adjusting pin 8217 to move inward to the air outlet 8215. The adjusting pin 8216 moves to squeeze the air pressure adjusting spring 8216, increasing the contact force between the air inlet 8214 and the air outlet 8215, so that the required output pressure of the compressed air cylinder 5 increases. E2. When it is necessary to reduce the output pressure of the gas cylinder, rotate the threaded adjusting column 8218 on the side of the adjusting bolt 8217 in the opposite direction to control the adjusting bolt 8217 to move outward of the air outlet cylinder 8215. The air pressure adjusting spring 8215 will be relatively extended, reducing the contact force between the air inlet cylinder 8214 and the air outlet cylinder 8215, thereby reducing the required output pressure of the compressed air cylinder 5.

[0037] The combined air breathing device and its usage method provided by this invention have the following beneficial effects: By linking the gas supply valve and the gas circuit valve, the traditional multi-step, step-by-step control method is simplified to a single valve button operation, significantly reducing the number of steps. For example, in an emergency, rescuers can switch from cylinder oxygen supply to filter canister oxygen supply within 2 seconds, greatly improving response speed.

[0038] It adopts a dual-action mechanism of pressing and rotating, combined with a three-stage reset spring, to automatically reset and separate, effectively avoiding oxygen supply failure or gas mixing caused by misoperation, reducing the misoperation rate by more than 90%.

[0039] The gas supply valve uses a wedge-shaped arc tooth and arc plate drive to convert rotational motion into linear clamping force of the sealing disc, which, together with the breathing diaphragm, achieves zero-leakage closure of the breathing hole. This design significantly improves airtightness, increases oxygen utilization by 30%-40%, and extends the service life of the gas cylinder.

[0040] The gas valve is equipped with a one-way diaphragm that automatically seals the delivery port when the gas cylinder is supplying gas, achieving mechanical interlocking isolation between the gas in the gas cylinder and the gas in the filter canister, preventing gas backflow and mixing, and ensuring 100% purity of the supplied gas.

[0041] The Hall effect switch is controlled by an electrical signal transmitted through a linkage wire. This, combined with the mechanical isolation of the unidirectional diaphragm, ensures that the three modes of oxygen supply—cylinder oxygen supply, filter canister oxygen supply, and active ventilation—cannot be activated simultaneously. This dual interlocking mechanism significantly improves the system's reliability.

[0042] The driven gear drives the switch mark to display the open / closed status of the breather hole in the valve cover window, allowing the operator to intuitively confirm the current mode and avoid misjudgment of the mode.

[0043] By rotating the threaded adjusting column to change the compression of the air pressure regulating spring, the output pressure of the gas cylinder can be steplessly adjusted on-site. This design can flexibly adjust the oxygen supply pressure according to different work intensities (such as sitting, walking, and high-intensity rescue), meeting diverse needs.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A combined air breathing device, characterized in that, include: Breathing mask (1), the side of the breathing mask (1) is connected to the air intake back plate (3) through a corrugated air duct (2); The air intake back panel (3) has a filter device at its input end and an air supply fan (10) inside it. Compressed air cylinder (4) is disposed on the back side of the air intake back plate (3); The oxygen supply branch (5) is connected at one end to the output end of the compressed air cylinder (4) and at the other end extends into the corrugated air guide pipe (2) and is connected to the air circuit valve (8); the oxygen supply branch (5) is provided with a control valve (6) for controlling the output of the compressed air cylinder (4) at the corrugated air guide pipe (2). An air supply valve (7) is located at the front end of the breathing mask (1). The air supply valve (7) includes an air supply base plate (71), a valve cover (72) is provided on the air supply base plate (71), and a breathing hole (74) is provided on the air supply base plate (71). The breathing hole (74) is connected to the corrugated air guide tube (2) through the breathing mask (1). A breathing diaphragm (73) is provided on the breathing hole (74), and a press-rotary valve button assembly (75) for controlling the opening and closing of the breathing hole (74) is provided on the breathing diaphragm (73). An airway valve (8) is located at the connection between the breathing mask (1) and the corrugated air duct (2) and is used as a control knob assembly for switching between the two airways of the oxygen supply branch (5) and the corrugated air duct (2). A control circuit board (81) is provided at the gas valve (8). The control circuit board (81) is electrically connected to the gas supply valve (7), the gas valve (8), the control valve (6) of the compressed air cylinder (4), and the blower (10) through the linkage wire (9) to realize the synchronous switching and interlocking of three oxygen supply modes: PAPR mode, APR mode and SCBA mode. The air valve (8) is provided with a control magnet (826) and three Hall switches (8219) that cooperate with the control magnet (826). The three Hall switches (8219) correspond to the PAPR mode position, APR mode position and SCBA mode position respectively. The control magnet (826) is fixed to the rotating part of the air circuit knob (825) through a fixing plate and can rotate synchronously with the air circuit knob (825) to trigger the electrical signal of the corresponding mode through the Hall switches (8219).

2. The combined air breathing device according to claim 1, characterized in that, The press-and-rotate valve assembly (75) includes a transmission cylinder (752) that is circumferentially engaged with the air supply knob (751). The inner wall of the air supply knob (751) is provided with internal teeth (753), and the top end of the transmission cylinder (752) is provided with meshing teeth (7521) so that when the air supply knob (751) is pressed down, the internal teeth (753) engage with the meshing teeth (7521) to achieve rotational drive. A first return spring (754) is provided between the air supply knob (751) and the transmission cylinder (752). When the air supply knob (751) is released, the first return spring (754) lifts the air supply knob (751) to separate the internal teeth (753) from the meshing teeth (7521).

3. A combined air breathing device according to claim 2, characterized in that, A follower cylinder (755) is sleeved inside the transmission cylinder (752), and the follower cylinder (755) is located on the upper wall side of the valve cover (72). The inner wall of the transmission cylinder (752) is provided with wedge-shaped arc teeth (756). The outer wall of the follower cylinder (755) is provided with a wedge-shaped arc plate (757) that cooperates with the wedge-shaped arc teeth (756). A connecting rod (758) is provided in the middle of the follower cylinder (755), and a sealing plate (759) is provided at the bottom of the connecting rod (758). The sealing plate (759) is directly opposite the breathing hole (74), and a second return spring (7510) is provided between the sealing plate (759) and the valve cover (72). When the air supply knob (751) is pressed and rotated, the transmission cylinder (752) is connected to the wedge-shaped arc tooth (756) which slides along the inclined surface of the wedge-shaped arc plate (757), pushing the follower cylinder (755) to move down. The second reset spring (7510) squeezes the sealing plate (759) to press the breathing diaphragm (73) to close the breathing hole (74) by elastic compression.

4. A combined air breathing device according to claim 3, characterized in that, A third return spring (7511) is provided between the follower cylinder (755) and the valve cover (72) to allow the follower cylinder (755) to move elastically on the valve cover (72).

5. A combined air breathing device according to claim 4, characterized in that, A transmission gear (7512) is provided at the lower part of the transmission cylinder (752), and a driven gear (7513) meshing with the transmission gear (7512) is provided on the side of the transmission gear (7512). A switch mark for indicating the opening and closing status of the breathing hole (74) is provided on the driven gear (7513), so that the transmission cylinder (752) connects to the driven gear (7513) to control the switch mark to move accordingly. The input end of the driven gear (7513) is connected to the output end of the control motor (7514), and the input interface of the control motor (7514) is connected to the air valve (8) through the linkage wire (9). The control motor (7514) is electrically connected to the three Hall switches (8219) via wires. The control motor (7514) is also capable of driving the air supply knob (825) to rotate to the SCBA mode position in response to the rotation of the air supply knob (751).

6. A combined air breathing device according to claim 5, characterized in that, The control valve assembly (82) includes a regulating valve seat (821) disposed at the output end of the corrugated air guide pipe (2). The interior of the regulating valve seat (821) is provided with an inner liner (822) at the output end of the oxygen supply branch (5). An air outlet (823) is provided on the upper part of the inner liner (822), and the air outlet (823) is connected to the corrugated air guide pipe (3). A cover plate (824) is provided on the upper part of the regulating valve seat (821), and an air passage knob (825) is provided above the cover plate (824). The inner wall of the air passage knob (825) is provided with a wedge-shaped guide plate (826). A drive disc (827) is provided below the air passage knob (825), and a guide block (828) that cooperates with the wedge-shaped guide plate (826) is provided on the outer periphery of the drive disc (827). A fourth return spring (829) is provided between the drive disc (827) and the cover plate (824). The drive disc (827) is connected to the closed disc (8211) via an adjusting rod (8210). The outer periphery of the closed disc (8211) is connected to a diaphragm (8212). The closed disc (8211) is directly opposite the air outlet (823) of the inner liner (822) and is provided with a sealing spring (8213) between it and the cover plate (824). When the gas circuit knob (825) is pressed and rotated, the wedge-shaped guide plate (826) squeezes the guide block (828) to make the drive disc (827) move down, and the closing disc (8211) presses the gas outlet (823) under the action of the sealing spring (8213) to close the oxygen supply branch (5).

7. A combined air breathing device according to claim 6, characterized in that, The inner liner (822) is fitted with a ventilator (8214), and the ventilator (8214) is connected to the air outlet (8215). The air outlet (8215) is fitted with a pressure regulating spring (8216). An adjusting bolt (8217) is provided on the side of the pressure regulating spring (8216) away from the air outlet (8215). A threaded adjusting post (8218) is provided on the side of the adjusting bolt (8217) away from the pressure regulating spring (8216). The rotary adjusting bolt (8217) changes the compression of the air pressure adjusting spring (8216) to adjust the opening pressure of the ventilator (8214).

8. A combined air breathing device according to claim 7, characterized in that, The output end of the corrugated air guide tube (2) of the gas valve (8) is provided with a delivery port (8220). A one-way diaphragm (8221) is provided at the delivery port (8220). When the oxygen supply branch (5) is opened, the gas pressure in the regulating valve seat (821) increases and pushes the one-way diaphragm (8221) to block the delivery port (8220), thereby achieving physical isolation between the gas cylinder gas and the delivery gas.

9. A combined air breathing device according to claim 8, characterized in that, An air supply fan (10) is provided at the air intake back plate (3), and a control knob for manually setting the power is provided at the air supply fan (10). The control knob is electrically connected to the control circuit board (81). The filtration device includes two sets of filter canisters (11) located at the input end of the air intake backplate (3), so that the air supply fan (10) delivers filtered air through the filter canisters (11) to the breathing mask (1) via the corrugated air duct (2); the three Hall switches (8219) are arranged in a circular arc on the regulating valve seat (821) of the air circuit valve (8), corresponding to the PAPR mode position, APR mode position and SCBA mode position respectively, with an installation angle interval of 30°, corresponding to the three stable working positions of the air circuit knob (825) rotated to 0°, 30° and 60° respectively; A Hall switch (8219) is provided below the air circuit knob (825), and a Hall element is provided below the Hall switch (8219) so that the air circuit knob (825) can control the Hall switch (8219) to open and close. The linkage wire (9) electrically connects the blower (10), control motor (7514), Hall switch (8219), control valve (6) and control circuit board 81. The blower (10) is electrically connected to the Hall switch (8219) corresponding to the PAPR mode position, so that the output signal of the Hall switch (8219) can directly control the start and stop of the blower (10).

10. A method of using a combined air breathing device according to claim 9, characterized in that, Includes the following steps: Step A: Start SCBA mode (Method A): A1. Press the air supply knob of the air supply valve (7). The air supply knob moves downward in the transmission cylinder (752) through the connecting cylinder and compresses the first return spring (754) until the inner teeth (753) of the inner wall of the air supply knob are engaged with the meshing teeth (7521) at the top of the transmission cylinder (752), forming a rotary drive connection. A2. Rotate the air supply knob clockwise. The engagement of the internal teeth (753) and the meshing teeth (7521) drives the transmission cylinder (752) to rotate. The wedge-shaped arc teeth (756) on the inner wall of the transmission cylinder (752) abut down along the inclined surface of the wedge-shaped arc plate (757) on the outer wall of the follower cylinder (755), pushing the follower cylinder (755) to move down to the bottom. At this time, the bottom of the wedge-shaped arc teeth (756) is engaged in the arc-shaped groove at the top of the wedge-shaped arc plate (757) to achieve positioning. A3. During the downward movement of the follower cylinder (755), the transmission gear (7512) at the lower part of the transmission cylinder (752) rotates synchronously, driving the driven gear (7513) meshing with it to rotate, so that the switch mark on the driven gear (7513) gradually rotates to the window of the valve cover (72), indicating that the breather hole (74) is in the closed state. A4. The transmission cylinder (752) moves down to compress the second return spring (7510). At the same time, the force between the bottom of the transmission cylinder (752) and the connecting rod (758) is lost. The third return spring (7511) stretches elastically and pushes the sealing plate (759) to press the breathing diaphragm (73), so that the breathing diaphragm (73) completely seals the breathing hole (74), realizing a closed environment for oxygen supply from the gas cylinder. A5. When the breathing hole (74) of the gas supply valve (7) is closed, the linkage wire (9) triggers an electrical signal to the Hall switch (8219) of the gas circuit valve (8), and the control magnet (826) triggers the Hall switch (8219) of the SCBA mode position to output a third electrical signal, opening the control valve (6) at the oxygen supply branch (5) so that it is in the gas cylinder oxygen supply position. The gas in the compressed air cylinder (5) is output to the ventilation cylinder (8214) through the oxygen supply branch (5). The gas pressure acts on the ventilation cylinder (8214), and the ventilation cylinder (8214) is forced to move towards the air outlet (8215) and compress the air pressure regulating spring (8216) until a gap is generated between the ventilation cylinder (8214) and the oxygen supply branch (5). The gas is output through the gap to the air outlet (823) of the inner liner cylinder (822). A6. After the compressed air cylinder (5) gas enters the regulating valve seat (821), the internal air pressure of the regulating valve seat (821) increases, which squeezes the one-way diaphragm (8221) to the position of the delivery port (8220), and seals the delivery port (8220), thus achieving physical isolation between the gas in the cylinder and the gas in the delivery pipe. A7. The gas output from the oxygen supply branch (5) is finally output to the breathing mask (1) through the outlet (823) to complete the start of the gas cylinder oxygen supply mode; Step B: Start SCBA mode (Method B); B1. Press the air circuit knob (825) of the air circuit valve (8) so that the wedge-shaped guide plate (826) on its inner wall moves down and fits against the inclined surface of the guide block (828) on the side of the drive disc (827) connecting column; B2. Rotate the air passage knob (825) clockwise. The wedge-shaped guide plate (826) presses the guide block (828) downward through the inclined surface until the arc-shaped groove at the bottom of the wedge-shaped guide plate (826) engages with the guide block (828). The drive disc (827) moves down and compresses the fourth reset spring (829). At this time, the sealing spring (8213) elastically elongates and presses the closing disc (8211) against the air outlet (823) of the inner liner (822), thereby achieving mechanical sealing of the air outlet (823). B3. Rotating the gas path knob (825) controls the interaction between the magnet and the Hall element. The magnet (826) triggers the Hall switch (8219) in the SCBA mode position to output a third electrical signal. The control valve (6) at the oxygen supply branch (5) is opened through the Hall switch (8219) so that it is in the oxygen supply position of the gas cylinder. At the same time, the control motor (7514) is connected to the linkage wire (9) to run, which drives the driven gear (7513) switch mark to rotate, and displays the status of the breathing hole (74) through the window at the valve cover (72). B4. The gas in the gas cylinder is output to the ventilation cylinder (8214) through the oxygen supply branch (5). The gas pressure acts on the ventilation cylinder (8214), and the ventilation cylinder (8214) moves towards the outlet cylinder (8215) and compresses the gas pressure regulating spring (8216) until a gap is created between the ventilation cylinder (8214) and the oxygen supply branch (5). The gas is output to the outlet (823) of the inner liner cylinder (822) through the gap. B5. After the compressed air cylinder (5) gas enters the regulating valve seat (821), the internal air pressure of the regulating valve seat (821) increases, which squeezes the one-way diaphragm (8221) to the position of the delivery port (8220), and seals the delivery port (8220), thus achieving physical isolation between the gas in the cylinder and the gas in the delivery pipe. B6. The gas output from the oxygen supply branch (5) is finally output to the breathing mask (1) through the outlet (823) to complete the start of the gas cylinder oxygen supply mode; Step C: Switch to APR mode (natural inhalation of the filter canister): C1. Press the air circuit knob (825) of the air circuit valve (8) again to move the wedge-shaped guide plate (826) on its inner wall down and fit against the inclined surface of the guide block (828) on the side of the drive disc (827) connecting column; C2. Rotate the air passage knob (825) counterclockwise. The wedge-shaped guide plate (826) moves out of the arc-shaped groove. The fourth reset spring (829) stretches elastically and lifts the drive plate (827). The drive plate (827) moves up and drives the adjusting rod (8210) to move up. The closing plate (8211) at the bottom of the adjusting rod (8210) moves up and compresses the sealing spring (8213), so that the closing plate (8211) is separated from the air outlet (823) and the blockage of the air outlet (823) is released. C3. When the air outlet (823) is opened, the Hall switch (8219) triggers an electrical signal that is fed back to the control circuit board (81). The control magnet (826) triggers the Hall switch (8219) in the APR mode position to output a second electrical signal. The control circuit board (81) controls the gas cylinder control valve (6) to close and the control motor (7514) to run through the electrical signal. The control motor (7514) drives the driven gear (7513) to rotate in the opposite direction, so that the switch mark rotates out from the window of the valve cover (72), and the window shows that the breather hole (74) is in the open state; at the same time, the driven gear (7513) meshes with the transmission gear (7512). Reverse rotation, connecting transmission cylinder (752) rotates in the opposite direction, wedge guide plate (826) moves out from the upper end of connecting column through arc groove, second reset spring (7510) elastically extends to lift drive plate (827), drive plate (827) moves up through limit protrusion to connect adjustment rod (8210), drive closed plate (8211) to move out from air outlet (823) of inner liner cylinder (822), at the same time covering membrane (8212) bulges up, release the blockage of air outlet (823), at this time the user naturally inhales air through filter canister (11) to the breathing mask (1) side, realize air supply of filter canister (11); Step D: Switch to PAPR mode (active air supply): D1. Rotate the air circuit knob (825) of the reverse air circuit valve (8), the wedge guide plate (826) moves out from the upper end of the connecting column through the arc groove, the second reset spring (7510) stretches elastically to lift the drive plate (827), the drive plate (827) moves up through the limit protrusion to connect the adjusting rod (8210), and drives the closed plate (8211) to move out from the air outlet (823) of the inner liner (822), at the same time the covering diaphragm (8212) bulges up to release the blockage of the air outlet (823), at the same time the air circuit knob (825) rotates to control the magnet and the Hall element to act, and control the operation of the air supply fan (10) through the Hall switch (8219), the control valve (6) at the oxygen supply branch (5) is closed and placed in the active air supply position; D2. The control magnet (826) triggers the Hall switch (8219) of the PAPR mode position to output the first electrical signal. The first electrical signal drives the air blower (10) to start, and the air filtered by the filter canister (11) is passed through the corrugated air duct (2). The one-way diaphragms (8221) on both sides of the corrugated air duct (2) are blown up, the delivery port (8220) is opened, and the air is delivered to the breathing mask (1), thus completing the switching of the oxygen supply mode of the filter canister (11). Step E: Adjust the cylinder output pressure: E1. When it is necessary to increase the output pressure of the gas cylinder, rotate the threaded adjusting column (8218) on the side of the adjusting bolt (8217) to control the adjusting bolt (8217) to move inward to the air outlet cylinder (8215). The adjusting bolt (8216) moves to squeeze the air pressure adjusting spring (8216), increasing the contact force between the air inlet cylinder (8214) and the air outlet cylinder (8215), so that the pressure required for the output of the compressed air cylinder (5) increases. E2. When it is necessary to reduce the output pressure of the gas cylinder, rotate the threaded adjusting column (8218) on the side of the adjusting plug (8217) in the opposite direction to control the adjusting plug (8217) to move to the outside of the air outlet (8215). The air pressure adjusting spring (8215) will be relatively extended, reducing the contact force between the air inlet (8214) and the air outlet (8215), thereby reducing the pressure required for the output of the compressed air cylinder (5).

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