An air supply device for a breathing mask

Abstract

The present invention discloses a gas supply device for a breathing mask, which includes a gas valve provided with a switching switch mechanism; an air bypass module is also provided, and the air bypass module is provided with a bypass switching switch; the bypass switching switch controls the switching of either the air bypass channel of the air bypass module or the gas valve to be opened. The gas supply device of the present invention makes the switching between ambient air and a compressed gas cylinder more convenient through a linkage switching mechanism, avoiding damage to the airtightness of the ventilation system; eliminating potential safety hazards.

Description

Technical Field

[0001] The present invention belongs to the technical fields of personal respiratory protection and emergency rescue, and relates to a gas supply device with ambient air bypass and an air respirator mask. Background Art

[0002] The positive pressure air respirator used by emergency rescue personnel (including firefighters and ambulance crew) is an isolated respirator with compressed air as the breathing air source. The compressed air used is stored in a self - contained high - pressure gas cylinder. In addition to the high - pressure gas cylinder, the positive pressure air respirator also includes components such as a pressure reducer, a high - pressure air duct, an alarm whistle pressure gauge, a medium - pressure air duct, a gas supply valve, a mask, a backplate and straps, etc. Its working process is that the high - pressure gas cylinder installed on the backplate and straps for personnel to carry is decompressed by the pressure reducer and then enters the medium - pressure air duct, the gas supply valve, and finally enters the mask for personnel to breathe. At the same time, the high - pressure gas cylinder is connected to the alarm whistle pressure gauge through the high - pressure air duct to monitor the gas pressure in the gas cylinder, so as to monitor the remaining gas volume.

[0003] Calculated according to the general configuration of the positive pressure air respirator, that is, the water volume of the gas cylinder is 6.8L and the rated working pressure is 30MPa, the gas storage volume in the gas cylinder should be about 2000L under standard atmospheric pressure conditions. Calculated according to the breathing volume of an adult in the working state of 50L / min, the theoretical maximum use time for a person wearing this respirator is only 40min.

[0004] In practical applications, when the wearer has not entered the rescue area, in order to save the air source and the gas wasted during dressing, pre - use inspection, etc., generally, the wearer does not wear the mask, or only wears the mask without wearing the gas supply valve, and breathes the ambient air first. When entering a dangerous environment such as a rescue area, the wearer then wears the mask and the gas supply valve properly and breathes the compressed air in the air respirator. Repeatedly wearing the mask and plugging and unplugging the gas supply valve will greatly increase the sealing of components such as the mask and the human face, the gas supply valve and the mask, and the medium - pressure air duct, resulting in air leakage in the respirator system and bringing major potential safety hazards. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas supply device with novel and unique structure, convenient use, and capable of improving the sealing of the breathing mask; the specific technical solution is as follows:

[0006] A gas supply device for a respirator mask includes a gas supply valve and a gas valve mounting seat. The gas supply valve is provided with a breathing switching switch mechanism; an air bypass module is also provided, and the air bypass module is provided with a bypass switching switch; the bypass switching switch controls the air bypass channel of the gas supply valve or the air bypass module to be opened selectively.

[0007] Furthermore, the air bypass module includes a linked switching lever and an air bypass channel switch mechanism; the switching lever is linked with the diaphragm connecting rod of the air supply valve breathing switching switch mechanism; the diaphragm connecting rod support frame is inserted on the switching lever, and the diaphragm connecting rod support frame rests on the inner side of the diaphragm connecting rod of the switching switch mechanism; when the switching lever is turned, the diaphragm connecting rod flips outward to close the air valve.

[0008] Furthermore, the air bypass channel switching mechanism is a switching track provided on the bypass switching switch that drives the switching lever to rotate; when the bypass switching switch is turned on, the switching lever moves along the switching track to close the air valve; when the bypass switching switch is turned off, the switching lever moves along the switching track to open the air valve.

[0009] Furthermore, the air bypass channel switch mechanism includes an air bypass channel switch, a pressure rod, a bypass closing sealing pad, a pressure rod return spring and a top block; the front end of the pressure rod is provided with a bypass closing sealing pad covering the air bypass channel, the rear end of the pressure rod is hinged to the pressure rod shaft, and the pressure rod shaft is provided with a pressure rod return spring; the bypass switching switch is provided with a top block, which is hinged to the air valve mounting seat; when the bypass switching switch is turned on, the top block lifts the pressure rod to open the air bypass channel; when the bypass switching switch is turned on, the pressure rod return spring resets the pressure rod to close the air bypass channel.

[0010] Furthermore, the air bypass module is also provided with a locking mechanism for locking the bypass switch.

[0011] Furthermore, the locking mechanism includes a locking rod positioning hole provided on the bypass switching switch and a locking rod slidably fixed on the air valve mounting seat and inserted into the locking rod positioning hole when locking.

[0012] Furthermore, the locking mechanism is also provided with a locking handle, and the locking handle is connected to the air valve mounting seat; the locking rod is hinged to the locking handle to form a connecting rod mechanism, and the axial movement of the locking rod is controlled by the locking handle.

[0013] Furthermore, the locking handle is provided with a limit indicator; the limit indicator is linked with the locking handle, and when the locking handle is located at the unlocking position, the limit indicator is rotated out of the limit indicator slot.

[0014] The present invention also provides a breathing mask equipped with the air supply device.

[0015] The air supply device of the present invention makes it more convenient to directly switch between ambient air and compressed gas cylinders through a linkage switching mechanism, thereby avoiding damage to the sealing of the ventilation system and eliminating potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Schematic structural diagram of a breathing mask equipped with a gas supply device;

[0017] Figure 2 Schematic partial structure diagram of the mask;

[0018] Figure 3 Schematic structural diagram of the nose and mouth mask;

[0019] Figure 4 Left view of the schematic structural diagram of the air valve;

[0020] Figure 5 For Figure 4 View of section A-A;

[0021] Figure 6 Front view of the schematic structural diagram of the air valve;

[0022] Figure 7 For Figure 6 View of section F-F;

[0023] Figure 8 Front view of the schematic structural diagram of the ambient air bypass control module of the present invention;

[0024] Figure 9 For Figure 8 View of section A-A;

[0025] Figure 10 For Figure 8 View of section B-B;

[0026] Figure 11 For Figure 8 View of section C-C;

[0027] Figure 12 For Figure 8 View of section D-D;

[0028] Figure 13 Top view of the schematic structural diagram of the ambient air bypass control module of the present invention;

[0029] Figure 14 Rear view of the schematic structural diagram of the ambient air bypass control module of the present invention.

[0030] In the figure: 1. Face mask; 2. Mouth and nose mask; 3. Air supply valve; 3-1. Valve base; 3-2. Base sheath; 3-3. Diaphragm link base; 3-4. Diaphragm link; 3-5. Diaphragm clamp; 3-6. Respiratory diaphragm; 3-7. Air supply valve adjusting spring; 3-8. Link insertion pin; 3-9. Air supply valve housing; 3-10. Air supply valve base; 3-11. Sheath; 3-12. Medium pressure conduit sealing ring; 3-13. Air supply valve sealing ring; 3-14. Medium pressure joint positioning ring; 3-15. Support frame return spring; 3-16. Switching lever; 3-17. Diaphragm link support frame; 3-18. Valve seat return spring; 3-19. Spool fixing pin; 3-20. Spool spring; 3-21. Spool; 3-22. Valve seat; 3-23. Valve seal sleeve; 3-24. Quantitative orifice; 3-25. Medium pressure joint; 3-26. Exhalation outlet; 3-27. Link fixed shaft; 3-28. Exhalation detection tube; 3-29. Link moving shaft; 4. Air supply valve mounting seat; 4-1. Dust-proof net; 4-2. Loudspeaker protective housing; 4-3. Fixing screw; 4-4. Bypass switching switch; 4-5. Bypass closing sealing gasket; 4-6. Top block; 4-7. Pressing rod; 4-8. Air supply valve switching track; 4-9. Lock rod positioning hole; 4-10. Baffle return spring; 4-11. Baffle opening bracket; 4-12. Bypass closing baffle; 4-13. Exhaust valve plate; 4-14. Locking handle return spring; 4-15. Circlip; 4-16. Fixing pin; 4-17. Lock rod; 4-18. Locking handle; 4-19. Inner housing of mounting seat; 4-20. Outer housing of mounting seat; 4-21. Loudspeaker; 4-22. Loudspeaker membrane; 4-23. Loudspeaker fixing flap; 4-24. Flat head screw; 4-25. Limit indicator. Detailed implementation manners

[0031] The present invention will be described more comprehensively below by using embodiments. The present invention can be embodied in various different forms and should not be construed as being limited to the exemplary embodiments described herein.

[0032] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", etc. may be used herein to describe the relationship of one element or feature shown in the figure to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device during use or operation. For example, if the device in the figure is inverted, the element described as being "lower" than another element or feature will be positioned "above" the other element or feature. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein can be interpreted accordingly.

[0033] As Figures 1 to 3As shown in the figure, the breathing mask in this embodiment includes a face mask 1, a mouth and nose mask 2, an air supply valve 3 and an air supply valve mounting seat; an ambient air bypass control module 4 is provided on the air supply valve mounting seat. The face mask 1 and the mouth and nose mask 2 adopt the prior art.

[0034] As Figures 4 to 7 shown, the air supply valve 3 includes a housing, a valve base body 3-1 and a valve core 3-21. The front end of the valve base body 3-1 is a medium-pressure joint 3-25 connected to a compressed air source; a valve seat hole is provided at the bottom of the medium-pressure joint 3-25. A sheath 3-11 fixes the medium-pressure joint 3-25 on the air supply valve base 3-10. A medium-pressure conduit seal ring 3-12 achieves a sealing effect when the medium-pressure joint 3-25 is connected to a medium-pressure pipe. An air supply valve seal ring 3-13 forms a sealed space inside the air supply valve base 3-10.

[0035] The valve seat 3-22 is inserted into the valve seat hole; a metering hole 3-24 is provided at the front end of the fixed valve seat 3-22; the flow rate of compressed air is restricted through the metering hole 3-24. A matrix sheath 3-2 is provided at the rear end of the valve seat 3-22. The valve base body 3-1 is divided into front and rear parts. The matrix sheath 3-2 is made of rubber and is sleeved outside the rear valve base body. After the front and rear valve base bodies are inserted, an annular groove or a semi-annular groove is provided on the outer surface of the front end of the rear valve base body, and there is a hole in the groove. They are connected together through a snap ring medium-pressure joint positioning ring 3-14; the snap ring medium-pressure joint positioning ring 3-14 is a snap ring structure. A pin is provided on the inner side of the snap ring. When the snap ring is snapped into the groove, the pin is inserted into the hole in the groove. The diameter of the hole is larger than the size of the pin, restricting the distance of the front and rear movement of the front and rear parts of the valve base body after assembly; facilitating assembly. A diaphragm link base 3-3 is connected to the rear end of the valve base body 3-1 by a thread to fix the matrix sheath 3-2. A long through groove is provided at the rear part of the valve core 3-21, and a pin hole is provided on the rear valve base body. A valve core fixing pin 3-19 is inserted into the pin hole and passes through the through groove at the same time to restrict the movement distance of the valve core 3-21 in the valve base body 3-1; when the valve core 3-21 is in the valve open state, it provides a pre-tightening force for the valve core spring 3-20. A spring retaining ring is provided at the front part of the valve core 3-21. When closing the valve, the valve core 3-21 moves forward relative to the valve seat 3-22 and approaches the valve seat 3-22. When closing the valve, the valve core spring 3-20 pushes against the spring washer to buffer the impact force during closing. The matrix sheath 3-2 divides the valve cavity in the housing into front and rear parts. The front part is communicated with the opening of the valve base body 3-1. After the valve is opened, the medium-pressure gas enters the intake cavity of the air supply valve mounting seat from the opening of the valve base body 3-1 through the valve outlet and enters the mask part from the outlet beside the intake cavity. The housing is also provided with an exhalation detection tube 3-28. The front end of the exhalation detection tube 3-28 is inserted into the exhalation outlet of the air supply valve mounting seat; the rear end is communicated with the rear part of the valve cavity.

[0036] On the side of the diaphragm cavity away from the diaphragm connecting rod 3-4, an air supply valve adjusting spring 3-7 is arranged; during inhalation, the air supply valve adjusting spring 3-7 pushes the diaphragm to reset. The diaphragm clamp 3-5 clamps the breathing diaphragm 3-6 in the diaphragm cavity.

[0037] Under the pressure of the air supply valve adjusting spring 3-7, the breathing diaphragm 3-6 fits against the inner side of the air supply valve base 3-10. All components of the air supply valve 1-3 are in their initial states, and the air supply passage is open. When the user exhales, the pressure of the exhaled air enters the air supply valve 3, and the gas pushes the breathing diaphragm 3-6 towards the air supply valve housing 3-9, thereby driving the diaphragm connecting rod 3-4 towards the air supply valve housing 3-9, triggering the movement of all relevant components, cutting off the air supply passage of the compressed air in the gas cylinder, and achieving the purpose of saving compressed air.

[0038] The diaphragm connecting rod 3-4, the connecting rod fixed shaft 3-27, the connecting rod fixed shaft 3-29, and the valve seat 3-22 form a connecting rod mechanism; among them, the upper connecting rod fixed shaft 3-27 is fixed on the air supply valve base 3-10; the connecting rod fixed shaft 3-29 realizes the articulated connection between the valve seat 3-22 and the diaphragm connecting rod 3-4.

[0039] The diaphragm connecting rod 3-4 is connected to the breathing diaphragm 3-6 through the connecting rod insertion pin 3-8. The connecting rod insertion pin 3-8 and the insertion pin seat form a sliding sleeve that is sleeved on the diaphragm connecting rod 3-4. The breathing diaphragm 3-6 drives the diaphragm connecting rod 3-4 towards the air supply valve housing 3-9 under the gas pressure generated when the user exhales, thereby driving the valve seat 3-22 in the opposite direction. The gas passage of the valve seat 3-22 is closed by the valve core 3-21. At the same time, the valve seat 3-22 is connected to the valve sealing sleeve 3-23, cutting off the air supply passage of the compressed air in the gas cylinder, and achieving the function of saving the compressed air in the gas cylinder. When the user inhales, the gas pressure disappears, the breathing diaphragm drives all relevant components to reset, and the air supply passage of the air supply valve 3 is opened again, achieving the air supply of the air supply valve 3. The valve seat return spring 3-18 makes the valve seat 3-22 reset and opens the air supply valve 3.

[0040] The valve sealing sleeve 3-23 is arranged at the connection part of the metering hole 3-24 and the medium-pressure joint 3-25 for sealing.

[0041] As Figures 8 to 14 shown, the air supply valve mounting seat is divided into two front and rear chambers. The front chamber is communicated with the outlet of the air supply valve 3, and the side opening is communicated with the mask part. The rear chamber is communicated with the mouth and nose mask. At the lower part of the partition wall between the front chamber and the rear chamber, an exhaust valve piece 4-13 and a baffle opening bracket 4-11 are arranged; the baffle opening bracket 4-11 is inside the exhaust valve piece 4-13, and the exhaust valve piece 4-13 is provided with a baffle return spring 4-10; a one-way valve is formed, which can only rotate towards the front chamber direction, allowing air to enter the front chamber from the rear chamber.

[0042] The exhalation detection tube of the air supply valve 3 is inserted into the exhalation outlet 3-26 on the isolation wall; the outer wall of the exhalation detection tube is in close contact with the exhalation outlet to achieve sealing.

[0043] The air supply valve mounting seat 4 includes an inner housing 4-19 of the mounting seat and an outer housing 4-20 of the mounting seat. The inner housing 4-19 of the mounting seat is used to connect and fix the nose and mouth mask 2, the face mask 1 and the outer housing 4-20 of the mounting seat. The outer housing 4-20 of the mounting seat is used to fix the air supply valve 3.

[0044] An ambient air passage is provided on the front wall of the front chamber of the air supply valve mounting seat 4; a bypass switching switch rotating shaft is provided on the left side of the air supply valve mounting seat; the bypass switching switch 4-4 is hinged to the air supply valve mounting seat 4 through the bypass switching switch rotating shaft. A pressure rod 4-7 is provided on the bypass switching switch 4-4, a bypass closing sealing gasket 4-5 is provided at the front end of the pressure rod, the rear end of the pressure rod 4-7 is hinged to the bypass switching switch 4-4 through a pressure rod shaft, and a pressure rod return spring is provided on the pressure rod shaft; the pressure rod return spring presses the bypass closing sealing gasket 4-5 at the front end of the pressure rod 4-7 to close the air bypass passage; a top block 4-6 is provided on the bypass switching switch 4-4, when the bypass switching switch is opened, the top block 4-6 jacks up the pressure rod 4-7 to open the air bypass passage.

[0045] A switching lever 3-16 is provided at a position close to the rotating shaft of the diaphragm link 3-4; the rotating shaft of the switching lever 3-16 is parallel to the rotating shaft of the diaphragm link 3-4. The diaphragm link support frame 3-17 is fixed on the rotating shaft of the switching lever 3-16; by rotating the switching lever 3-16, the diaphragm link 3-4 is toggled to rotate through the diaphragm link support frame 3-17 to close the air supply valve 3. The support frame return spring 3-15 returns the diaphragm link support frame 3-17 after movement.

[0046] An outward protrusion is provided at the end of the rotating handle of the switching lever 3-16; an air supply valve switching track 4-8 is provided on the bypass switching switch 4-4; the protrusion is inserted into the air supply valve switching track 4-8. When the bypass switching switch 4-4 is turned outward, the protrusion slides in the air supply valve switching track 4-8 to drive the switching lever 3-16 to rotate and close the air supply valve 3.

[0047] To avoid misoperation, the bypass switching switch 4-4 is also provided with a locking mechanism. The locking mechanism consists of a lock rod positioning hole 4-9 and a lock rod 4-17; the lock rod positioning hole 4-9 is provided on the bypass switching switch 4-4. In the closed state, the lock rod 4-17 is inserted into the lock rod positioning hole 4-9 for locking, and the bypass switching switch 4-4 cannot rotate.

[0048] For convenient locking, the locking mechanism is also provided with a locking handle 4-18, and the locking handle 4-18 drives the lock rod 4-17 to move up and down through a linkage mechanism. The locking handle 4-18 is hinged to the air supply valve mounting seat 4 through a fixing pin 4-16; the fixing pin 4-16 is fixed by a snap ring 4-15 to prevent it from falling off. The top end of the lock rod is hinged to the locking handle 4-18 through another pin shaft to form a linkage mechanism. The locking handle 4-18 is also provided with a locking handle return spring 4-14 for the reset of the locking handle 4-18.

[0049] A warning strip block of bright color can also be provided at the other end of the locking handle as a limit indicator 4-25; a warning strip block hidden groove is provided on the air supply valve mounting seat 4; when the handle is in the normal state, the warning strip block is located in the warning strip block hidden groove; when the handle is pressed, the warning strip block rises to warn the user.

[0050] In order to be applicable to left-handed operation, the rotating shaft of the ambient air bypass control module 4 can also be provided on the right side.

[0051] The air supply valve mounting seat 4 is also provided with a loudspeaker 4-22 for convenient long-distance communication. The loudspeaker protective shell 4-2 is a protective shell provided on the mask housing 4-20 for protecting the loudspeaker. The fixing screw 4-3 fixes the loudspeaker protective shell to the air supply valve mounting seat 4. The loudspeaker fixing flap 4-23 is used for fixing the loudspeaker 4-21. The flat head screw 4-24 is used for fixing the loudspeaker fixing flap 4-23.

[0052] A dustproof net 4-1 is provided outside the protective shell of the loudspeaker for dust prevention. The loudspeaker diaphragm 4-22 is installed on one side of the mouth and nose mask.

[0053] When the ambient air bypass control module 4 is closed, this breathing mask functions the same as the existing breathing mask. The compressed air enters the face mask 1 after being decompressed by the air supply valve 3, and enters the mouth and nose mask through the one-way valve between the face mask 1 and the mouth and nose mask 2 and is inhaled by the human body; the waste gas exhaled by the human body is discharged into the atmosphere from the mouth and nose mask 2 through the exhaust valve piece 4-13 and the bypass closing gasket of the ambient air bypass control module 4. When ambient air can be breathed, the bypass switch 4-4 of the ambient air bypass control module 4 is turned on, the outer end of the switching lever 3-16 slides in the air supply valve switching track 4-8, drives the switching lever 3-16 to rotate, drives the diaphragm linkage 3-4 to rotate by the diaphragm linkage support frame 3-17, and pushes the valve core 21 to close the air supply valve 3.

[0054] The above examples are only used to illustrate the present invention. In addition, there are various different implementation manners, and these implementation manners can be thought of by those skilled in the art after understanding the idea of the present invention. Therefore, they are not listed one by one here.

Claims

1. An air supply device for a respirator mask, comprising an air supply valve and an air valve mounting seat, wherein the air supply valve is provided with a breathing switching switch mechanism; It is characterized in that An air bypass module is also provided, and the air bypass module is provided with a bypass switching switch; the bypass switching switch controls the air supply valve or the air bypass channel of the air bypass module to be opened selectively; the air bypass module includes a linked switching lever and an air bypass channel switch mechanism; the switching lever is linked with the diaphragm connecting rod of the air supply valve breathing switching switch mechanism; the diaphragm connecting rod support frame is plugged on the switching lever, and the diaphragm connecting rod support frame rests on the inner side of the diaphragm connecting rod of the switching switch mechanism; the switching lever is toggled, and the diaphragm connecting rod flips outward to close the air valve, and the air bypass module is also provided with A locking mechanism for locking the bypass switching switch, the locking mechanism comprising a locking rod positioning hole provided on the bypass switching switch and a locking rod slidably fixed on the gas valve mounting seat and inserted into the locking rod positioning hole when locking, the locking mechanism is also provided with a locking handle, and the locking handle is connected to the gas valve mounting seat; the locking rod is hinged to the locking handle to form a connecting rod mechanism, and the locking handle is used to control the axial movement of the locking rod along the locking rod; the locking handle is provided with a limit indicator; the limit indicator is linked to the locking handle, and when the locking handle is in the unlocking position, the limit indicator rotates out of the limit indicator slot.

2. The gas supply device according to claim 1, It is characterized in that The air bypass channel switch mechanism is a switching track set on the bypass switching switch to drive the switching lever to rotate; when the bypass switching switch is turned on, the switching lever moves along the switching track to close the air valve; when the bypass switching switch is turned off, the switching lever moves along the switching track to open the air valve.

3. The gas supply device according to claim 1, It is characterized in that The air bypass channel switch mechanism includes an air bypass channel switch, a pressure rod, a bypass closing sealing pad, a pressure rod reset spring and a top block; the front end of the pressure rod is provided with a bypass closing sealing pad covering the air bypass channel, the rear end of the pressure rod is hinged with the pressure rod shaft, and the pressure rod shaft is provided with a pressure rod reset spring; the bypass switching switch is provided with a top block, which is hinged with the air valve mounting seat; when the bypass switching switch is turned on, the top block lifts the pressure rod to open the air bypass channel; The bypass switch is closed, and the pressure rod return spring resets the pressure rod to close the air bypass channel.

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