An air supply valve for a breathing apparatus that supplies air on demand

Abstract

The application provides an air supply valve of a breathing apparatus which supplies air on demand, a gap is formed between a valve rod and an inner part of a valve pipe; a valve rod return spring is arranged in the valve pipe, a left end of the valve rod return spring is in abutment with a right end of a valve rod seat, and a left end is in abutment with the valve rod; a diaphragm assembly is arranged on a shell; an upper end of a lever is adjacent to an inhalation diaphragm assembly; a lower end has two symmetrical push feet; both sides of the valve pipe have lever rotation grooves; both sides of the valve rod have symmetrical force receiving bosses; the two push feet of the lever are inserted into the rotation grooves of the valve pipe and can rotate in the rotation grooves; and the two push feet of the lever are attached to the right side of the force receiving bosses of the valve rod. The valve rod is in a near-suspension state, the breathing resistance is greatly reduced, the breathing resistance of the air supply valve can be adjusted, and the air supply valve has air saving and safety emergency functions.

Description

Technical Field

[0001] This invention relates to a respirator air supply valve that supplies air on demand. Background Technology

[0002] The air supply valve is a component that reduces the pressure of the medium-pressure gas output from the pressure reducer to a breathing pressure suitable for the wearer, based on their inhalation volume. Currently, the size of the diaphragm in most air supply valves affects breathing resistance. A larger diaphragm can better reduce breathing resistance, but a large diaphragm also results in an oversized air supply valve, which can obstruct vision, increase the valve's weight, and make breathing resistance non-adjustable. Summary of the Invention

[0003] This invention provides a respirator air supply valve that supplies air on demand, with the valve stem in a near-floating state, greatly reducing breathing resistance; the breathing resistance of the air supply valve can be adjusted; it also has both air-saving and emergency safety functions; and it is smaller in size while increasing the diaphragm area, thus overcoming the shortcomings of the prior art.

[0004] This invention provides a respirator air supply valve for on-demand air supply, comprising a housing 100, a valve tube 200, a valve seat 300, a valve stem seat 400, a valve stem 500, a valve stem return spring 600, a diaphragm assembly 700, and a lever 800; wherein, the valve tube 200 is fixedly connected to the housing 100; the side wall of the valve tube 200 has a vent hole 210, which communicates with the air outlet of the housing 100; the valve seat 300 is fixed to the right end of the central hole of the valve tube 200; the valve stem seat 400 is disposed at the left end of the central hole of the valve tube 200, and the two are slidably connected; the valve stem 500 is disposed in the central hole of the valve tube 200, and the valve stem can fit and seal against the left end of the valve seat 300; the valve stem 500 and the valve tube 200 are connected in a slidable manner. The valve tube 200 has an internal gap; the valve stem return spring 600 is disposed inside the valve tube 200, with its left end pressing against the right end of the valve stem seat 400 and its right end pressing against the valve stem 500; the diaphragm assembly 700 is disposed on the outer casing 100; the upper end of the lever 800 is adjacent to the suction diaphragm assembly 710; the lower end has two symmetrical push feet 810; the valve tube 200 has lever rotation grooves 230 on both sides; the valve stem 500 has symmetrical force-bearing bosses 520 on both sides; the two push feet 810 of the lever 800 are inserted into the rotation grooves 230 of the valve tube 200 and can rotate in the rotation grooves 230; and the two push feet 810 of the lever 800 are attached to the right side of the force-bearing bosses 520 of the valve stem 500.

[0005] Further, the application provides a breathing apparatus air supply valve for supplying air on demand, which can further have the features that the diaphragm assembly 700 comprises: an inhalation diaphragm assembly 710, a diaphragm cover 720, and a diaphragm positive spring 730; the inhalation diaphragm assembly 710 is fixedly connected to the housing 100; the diaphragm cover 720 is fixedly connected to the housing 100 and covers the inhalation diaphragm assembly 710; one end of the diaphragm positive spring 730 abuts against the inhalation diaphragm assembly 710, and the other end abuts against the diaphragm cover 720.

[0006] Further, the application provides a breathing apparatus air supply valve for supplying air on demand, which can further have the features that the inhalation diaphragm assembly 710 comprises: an oval connecting inhalation diaphragm 711 and a circular central inhalation diaphragm 712; the central inhalation diaphragm 712 is located in the middle of the connecting inhalation diaphragm 711; the central inhalation diaphragm 712 is sealingly connected to the connecting inhalation diaphragm 711 as a whole; the connecting inhalation diaphragm 711 has a semicircular sealing strip 711a on the circumference, which is embedded in a corresponding sealing groove of the housing; the diaphragm cover 720 is fixedly connected to the housing 100 in an interference fit, and covers the inhalation diaphragm assembly 710, with the circumference pressing against the semicircular sealing strip 711a.

[0007] Further, the application provides a breathing apparatus air supply valve for supplying air on demand, which can further have the features that the diaphragm assembly 700 further comprises: an emergency air supply button 740 and an emergency air supply button return spring 750; the lower end of the emergency air supply button 740 is clamped in the central hole of the diaphragm cover 720; one end of the emergency air supply button return spring 750 abuts against the emergency air supply button 740, and the other end abuts against the outside of the diaphragm cover 720.

[0008] Further, the application provides a breathing apparatus air supply valve for supplying air on demand, which can further have the features that it further comprises a throttle assembly 900; the throttle assembly comprises: a throttle button 910 and a throttle return spring 920; the throttle button 910 is slidingly connected to the left end of the housing 100 and protrudes outwardly from the housing 100; the left end of the valve rod 500 is slidingly connected to the throttle button 910; one end of the throttle return spring 920 abuts against the throttle button 910, and the other end abuts against the valve rod seat 400; the lever 800 is provided with a throttle elastic lock 801; the throttle elastic lock 801 is fixed to the housing 100; the lever 800 has throttle fixing bosses 820 on both sides; the throttle fixing bosses 820 of the lever 800 can be embedded in the throttle elastic lock 801.

[0009] Further, the application provides an air supply valve of a breathing apparatus for supplying air on demand, and can further have the feature that the air regulating assembly further comprises an air regulating limit ring 930; the air regulating limit ring 930 is located in the housing 100, and the air regulating limit ring 930 is partially clamped on the circumference of the air regulating button 910 and partially protrudes to abut on the housing 100 to limit the limit position of the air regulating return spring 920.

[0010] Further, the application provides an air supply valve of a breathing apparatus for supplying air on demand, and can further have the feature that the left end of the valve seat 300 is provided with a valve seat adjusting screw 310; the valve pipe 200 is provided with a valve pipe internal thread 220, and the valve seat adjusting screw 310 is engaged with the valve pipe internal thread 220 of the valve pipe 200; the front end of the valve seat 300 passes through the center hole of the valve seat adjusting screw 310 and then abuts on the end surface of the valve rod 500.

[0011] Further, the application provides an air supply valve of a breathing apparatus for supplying air on demand, and can further have the feature that the valve rod 500 has a flow guide shape; and the valve rod 500 has a center hole.

[0012] Further, the application provides an air supply valve of a breathing apparatus for supplying air on demand, and can further have the feature that the left end of the valve rod 500 extends into the non-through center hole of the valve rod seat 400. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a half-section structure schematic diagram of the air supply valve of the breathing apparatus for supplying air on demand in the embodiment.

[0014] Figure 2 is a structure schematic diagram of the valve rod opening the air supply passage in the embodiment.

[0015] Figure 3 is a structure schematic diagram of the diaphragm assembly in the embodiment.

[0016] Figure 4 is a three-dimensional view of the connection relationship between the valve pipe and the lever in the embodiment.

[0017] Figure 5 is a three-dimensional view of the valve rod in the embodiment.

[0018] Figure 6 is a three-dimensional view of the lever in the embodiment. DETAILED DESCRIPTION

[0019] The application will be further described below in combination with the drawings and specific embodiments.

[0020] EMBODIMENT

[0021] The air supply valve of the on-demand air supply respirator in the embodiment comprises a housing 100, a valve tube 200, a valve seat 300, a valve rod seat 400, a valve rod 500, a valve rod return spring 600, a diaphragm assembly 700, and a lever 800.

[0022] The valve tube 200 is fixedly connected with the housing 100. In the embodiment, the valve tube 200 and the housing 100 are fixedly connected by interference fit. The right end of the valve tube 200 extends out of the housing 100 and is provided with a connecting thread 220, which can be engaged with the internal thread of the air supply pipe 1 to achieve detachable connection of the two. An O-ring is arranged in the circumferential groove of the valve tube 200 to achieve sealing between the valve tube 200 and the housing 100. The sidewall of the valve tube 200 is provided with a vent hole 210, which is in communication with the air outlet hole 120 of the housing 100, and the air outlet hole 120 is fixedly and sealingly connected with the air suction component 2.

[0023] The valve seat 300 is fixedly connected with the right end of the central hole of the valve tube 200 by interference fit. An O-ring is arranged in the circumferential groove of the valve seat 300 to achieve sealing between the valve seat 300 and the valve tube 200.

[0024] As a preferred embodiment, a valve seat adjusting screw 310 is arranged at the left end of the valve seat 300. The valve tube 200 is provided with a valve tube internal thread 220, and the valve seat adjusting screw 310 is engaged with the valve tube internal thread 220 of the valve tube 200. The front end of the valve seat 300 passes through the central hole of the valve seat adjusting screw 310 and then abuts against the end surface of the valve rod 500. The valve seat adjusting screw 310 can adjust the axial depth of the valve seat 300 in the valve tube 200 to ensure the sealing performance.

[0025] In the embodiment, the valve rod seat 400 is arranged at the left end of the central hole of the valve tube 200 and is slidably connected with the valve tube 200. An O-ring is arranged in the circumferential groove of the valve rod seat 400 to achieve sealing between the valve rod seat 400 and the valve tube 200.

[0026] The right end of the valve rod 500 is provided with a valve rod sealing cover 510. The valve rod 500 is arranged in the central hole of the valve tube 200, and the valve rod sealing cover 510 can abut against and seal the left end of the valve seat 300. The valve rod 500 and the inside of the valve tube 200 have a gap. As a preferred embodiment, the valve rod 500 has a flow guide shape. In the embodiment, the valve rod 500 has a central hole, which not only reduces the weight of the valve rod 500 but also allows air flow into the valve rod 500.

[0027] As a preferred embodiment, the left end of the valve rod 500 extends into the non-through central hole of the valve rod seat 400. An O-ring is arranged in the groove at the end of the valve rod 500 to achieve sealing between the valve rod 500 and the valve tube 200.

[0028] Valve stem reset spring 600 is arranged in valve pipe 200. Left end of valve stem reset spring 600 is in abutment with right end of valve stem seat 400, and right end of valve stem reset spring 600 is in abutment with valve stem 500.

[0029] Diaphragm assembly 700 comprises: air suction diaphragm assembly 710, diaphragm cover 720, diaphragm positive pressure spring 730. In the embodiment, air suction diaphragm assembly 710 comprises: oval connecting air suction diaphragm 711 and circular central air suction diaphragm 712. Central air suction diaphragm 712 is located in the middle position of connecting air suction diaphragm 711. Central air suction diaphragm 712 is in sealing connection with connecting air suction diaphragm 711 as a whole. Half-circular sealing strip 711a is arranged on the circumference of connecting air suction diaphragm 711 and is embedded in the corresponding sealing groove of the shell. Diaphragm cover 720 is fixedly connected with shell 100 by interference fit, and diaphragm cover 720 covers air suction diaphragm assembly 710 and is pressed on the outside of half-circular sealing strip 711a. One end of diaphragm positive pressure spring 730 is in abutment with air suction diaphragm assembly 710, and the other end of diaphragm positive pressure spring 730 is in abutment with diaphragm cover 720. Under the same size, air suction diaphragm assembly 710 is 1.8 times larger than the diaphragm size of the existing air supply valve. Under the condition of ensuring positive pressure, the breathing resistance can be effectively reduced, and the air supply flow is improved.

[0030] In the embodiment, lever 800 is in H shape as a whole. Upper end of H-shaped lever 800 is adjacent to the lower side of air suction diaphragm assembly 710, and lower end of H-shaped lever 800 has two push feet 810. Both sides of valve pipe 200 have lever rotation grooves 230. Both sides of valve stem 500 have symmetrical stress bosses 520.

[0031] Two push feet 810 of H-shaped lever 800 are inserted into rotation grooves 230 of valve pipe 200 and can rotate in rotation grooves 230. Two push feet 810 of H-shaped lever 800 also fit on the right side of stress bosses 520 of valve stem 500.

[0032] Working principle of the air supply valve of the on-demand air breathing apparatus:

[0033] In the initial state, valve stem 500 is in abutment with the end face of valve stem seat 400 under the action of valve stem reset spring 600, and the air supply channel is closed. At this time, the gas in gas delivery pipe 1 cannot enter the air supply valve.

[0034] When the user inhales, the gas in the gas supply valve is sucked away, and the air pressure decreases. At this time, the diaphragm spring 730 pushes the inhalation diaphragm assembly 710 against the upper end of the lever 800, thereby driving the lever 800 to rotate around the valve pipe 200, and the push foot 810 pushes the stress boss 520, thereby driving the valve rod 500 to move to the left. The sealing end surface of the valve rod 500 is away from the end surface of the valve rod seat 400, and the gas supply channel is opened. The gas in the gas supply pipe 1 enters the gap between the valve pipe 200 and the valve rod 500 through the central hole of the valve rod seat 400, and then enters the gas outlet hole 120 from the air hole 210 on the side wall of the valve pipe 200, thereby realizing gas supply.

[0035] Once the user stops inhaling, the gas in the gas supply pipe 1 entering the gas supply valve increases the internal air pressure, and the inhalation diaphragm assembly 710 is pushed upward, and the lever 800 loses driving force. Under the action of the valve rod return spring 600, the valve rod 500 returns, and the right end is tightly attached to the end surface of the valve rod seat 400, thereby closing the gas supply channel.

[0036] As a preferred embodiment, the diaphragm assembly 700 further comprises an emergency gas supply button 740 and an emergency gas supply button return spring 750. The lower end of the emergency gas supply button 740 is clamped in the central hole of the diaphragm cover 720. One end of the emergency gas supply button return spring 750 is pushed against the emergency gas supply button 740, and the other end is pushed against the outside of the diaphragm cover 720.

[0037] When the gas supply valve of the on-demand air breathing apparatus fails to automatically supply air normally, the emergency gas supply button 740 is pressed, the upper end of the lever 800 is stressed, thereby rotating counterclockwise around the valve pipe 200, pushing the valve rod 500 to move to the left end, opening the gas supply channel, realizing manual mechanical gas supply, and ensuring safety.

[0038] As a preferred embodiment, the gas supply valve of the on-demand air breathing apparatus further comprises a gas regulating assembly 900. The gas regulating assembly comprises a gas regulating button 910, a gas regulating return spring 920, and a gas regulating limiting ring 930.

[0039] The gas regulating button 910 is in sliding connection with the left end of the shell 100, and protrudes outward from the shell 100. An O-shaped sealing ring is arranged in the circumferential groove of the gas regulating button 910, thereby realizing sealing between the gas regulating button 910 and the shell 100.

[0040] The left end of the valve rod 500 is in sliding connection with the gas regulating button 910. In this embodiment, the outer circle of the left end of the valve rod 500 is matched with the central hole of the gas regulating button 910, and the left end of the valve rod 500 can slide in the central hole of the gas regulating button 910.

[0041] The throttle reset spring 920 is arranged in the center hole of the throttle button 910, one end of which is in contact with the throttle button 910 and the other end is in contact with the valve rod seat 400. The throttle limiting ring 930 is arranged in the shell 100, part of which is clamped on the circumference of the throttle button 910 and part of which protrudes to limit the outer limit position of the throttle reset spring 920.

[0042] The lever 800 is configured with a throttle elastic lock 801. The throttle elastic lock 801 is fixed on the shell 100. The H-shaped lever 800 has two throttle fixed bosses 820 on the two sides. The throttle fixed boss 820 of the lever 800 can be embedded in the throttle elastic lock 801.

[0043] When the air supply valve of the on-demand air breathing apparatus is not used, the throttle button 910 is pressed, at this time the throttle reset spring 920 is pressed, so that the valve rod seat 400 and the valve rod 500 move to the right end, at this time the force boss 520 on the valve rod 500 pushes the throttle elastic lock 801 in the lever 800 to lock the lever 800.

[0044] The above-described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

Claims

1. An air supply valve for an air breathing apparatus, characterised in that: The valve comprises a shell (100), a valve pipe (200), a valve seat (300), a valve rod seat (400), a valve rod (500), a valve rod return spring (600), a diaphragm assembly (700), a lever (800); The valve pipe (200) is fixedly connected with the shell (100); the side wall of the valve pipe (200) is provided with a vent hole (210) which is in communication with the air outlet hole of the shell (100); The valve seat (300) is fixed at the other end of the central hole of the valve pipe (200); The valve rod seat (400) is arranged at one end of the central hole of the valve pipe (200) and is slidably connected with the valve pipe (200); The valve rod (500) is arranged in the central hole of the valve pipe (200) and is in sealing contact with one end of the valve seat (300); the valve rod (500) has a gap with the inside of the valve pipe (200); The valve rod return spring (600) is arranged in the valve pipe (200) and is in contact with the other end of the valve rod seat (400) and the valve rod (500); The diaphragm assembly (700) is arranged on the shell (100) and comprises an air suction diaphragm assembly (710), a diaphragm cover (720) and a diaphragm positive spring (730); the air suction diaphragm assembly (710) is fixedly connected with the shell (100); The diaphragm cover (720) is fixedly connected with the shell (100) and covers the air suction diaphragm assembly (710); One end of the diaphragm positive spring (730) is in contact with the air suction diaphragm assembly (710) and the other end is in contact with the diaphragm cover (720); One end of the lever (800) is adjacent to the air suction diaphragm assembly (710) and the lower end has two symmetrical push feet (810); The valve pipe (200) is provided with lever rotating grooves (230) on both sides; the valve rod (500) is provided with symmetrical stress bosses (520) on both sides; The two push feet (810) of the lever (800) are inserted into the rotating grooves (230) of the valve pipe (200) and can rotate in the rotating grooves (230); and the two push feet (810) of the lever (800) are in contact with the other side of the stress boss (520) of the valve rod (500); The valve further comprises a throttle assembly (900); the throttle assembly comprises a throttle button (910) and a throttle return spring (920); The throttle button (910) is slidably connected with one end of the shell (100) and protrudes outward from the shell (100); One end of the valve rod (500) is slidably connected with the throttle button (910); One end of the throttle return spring (920) is in contact with the throttle button (910) and the other end is in contact with the valve rod seat (400); The lever (800) is provided with a throttle elastic lock (801); the throttle elastic lock (801) is fixed on the shell (100). The lever (800) has two sides with air-intake fixing bosses (820); the air-intake fixing bosses (820) of the lever (800) can be embedded into the air-intake elastic lock (801).

2. The air supply valve of the air respirator of claim 1, It is characterized in that: Wherein, The air-intake diaphragm assembly (710) comprises: An oval connecting air-intake diaphragm (711) and a circular central air-intake diaphragm (712); The central air-intake diaphragm (712) is located at the middle position of the connecting air-intake diaphragm (711); the central air-intake diaphragm (712) is in sealing connection with the connecting air-intake diaphragm (711) as a whole; the connecting air-intake diaphragm (711) has a semicircular sealing strip (711a) on the circumference, which is embedded into the corresponding sealing groove of the shell; The diaphragm cover (720) is fixedly connected with the shell (100) in an interference fit, and the diaphragm cover (720) covers the air-intake diaphragm assembly (710) outside and is circumferentially pressed outside the semicircular sealing strip (711a).

3. The air supply valve of the air respirator according to claim 1, characterized in that: wherein The diaphragm assembly (700) further comprises an emergency air supply button (740) and an emergency air supply button return spring (750); The lower end of the emergency air supply button (740) is clamped in the central hole of the diaphragm cover (720); one end of the emergency air supply button return spring (750) is abutted against the emergency air supply button (740), and the other end is abutted against the outside of the diaphragm cover (720).

4. The air supply valve of the air respirator according to claim 1, characterized in that: The air-intake assembly further comprises an air-intake limiting ring (930); The air-intake limiting ring (930) is located in the shell (100), part of the air-intake limiting ring (930) is clamped on the circumference of the air-intake button (910), and part of the air-intake limiting ring (930) protrudes to abut against the shell (100) to limit the limit position of the air-intake return spring (920) outward.

5. The air supply valve of the air respirator according to claim 1, characterized in that: wherein, One end of the valve seat (300) is provided with a valve seat adjusting screw (310); the valve tube (200) has a valve tube internal thread (220); the valve seat adjusting screw (310) is engaged with the valve tube internal thread (220) of the valve tube (200); The front end of the valve seat (300) passes through the central hole of the valve seat adjusting screw (310) and then abuts against the end surface of the valve rod (500).

6. The air supply valve of the air respirator according to claim 1, characterized in that: wherein The valve rod (500) has a flow guide shape; the valve rod (500) has a central hole.

7. The air supply valve of the air respirator according to claim 1, characterized in that: One end of the valve rod (500) extends into the non-through central hole of the valve rod seat (400).

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