A wearable gas generator

Abstract

The present invention discloses a wearable gas generator, including a compressed gas cylinder, an exhaust assembly and a silencer assembly, the exhaust assembly including an exhaust hood and a flow guide hood, one end of the exhaust hood is connected to the compressed gas cylinder and a first expansion chamber is formed between the two, an ignition device is arranged in the exhaust hood and connected to the first expansion chamber, the flow guide hood is sleeved outside the exhaust hood, a joint of the ignition device extends out of the exhaust hood and the flow guide hood, a second expansion chamber is formed between the flow guide hood and the exhaust hood, a plurality of first air guide holes arranged around the ignition device are connected to the first expansion chamber and the second expansion chamber, the second expansion chamber is connected to an air outlet, and the silencer assembly is connected to the air outlet via an adapter. The present invention can ensure rapid release without affecting the human body, is safe and reliable, and has a simple structure.

Description

Technical Field

[0001] The invention relates to the technical field of emergency life-saving, and in particular to a wearable gas generator. Background Art

[0002] Gas generators are generally used in airbags to quickly release gas and inflate the airbags. Currently, most of the gas generators on the market are used in the industrial field. They have complex structures and are usually heavy and bulky, which are not suitable for use in human protective airbags. In the prior art, there are also gas generators that use chemical substances to react to generate gas. They use ordinary gas generating agents, and the transmission tube directly detonates the gas generating agent in the airbag to react and generate gas. Although the gas generation speed is fast, the reaction is very violent and the volume is loud. The temperature of the chemical combustion gas is high, usually greater than 2000°C, the sound is violent, the danger is high, and the safety and reliability are low. For example: the gas generator of the vehicle airbag; after the gas generating agent burns or explodes quickly, a negative pressure is formed inside the gas generator. If flammable and explosive gases from the outside are inhaled, they will cause secondary combustion or explosion when encountering local high temperatures. Even under the premise of good fixation, it will cause personal injury and cannot be used as a human body wear. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wearable gas generator suitable for human body to wear, which ensures rapid release without causing any impact on the human body, is safe and reliable, and has a simple structure.

[0004] In order to solve the above technical problems, the present invention provides a wearable gas generator, including a compressed gas cylinder, an exhaust assembly and a silencer assembly, the exhaust assembly including an exhaust hood and a guide hood, one end of the exhaust hood is connected to the compressed gas cylinder and a first expansion chamber is formed therebetween, an ignition device is arranged in the exhaust hood and connected to the first expansion chamber, the guide hood is sleeved outside the exhaust hood, a joint of the ignition device extends out of the exhaust hood and the guide hood, a second expansion chamber is formed between the guide hood and the exhaust hood, a plurality of first air guide holes arranged around the ignition device are connected to the first expansion chamber and the second expansion chamber, the second expansion chamber is connected to an air outlet, and the silencer assembly is connected to the air outlet through an adapter.

[0005] Furthermore, the exhaust hood includes a first connector and a second connector, the first connector is sleeved on the outside of the compressed gas cylinder, the deflector is sleeved on the outside of the second connector, the ignition device is arranged in one end where the second connector is connected to the first connector, the deflector is abutted against the first connector, and a first sealing ring is arranged between the two.

[0006] Furthermore, the middle part of the guide cover is connected to the middle part of the second connecting head, and a second expansion chamber and a third expansion chamber are respectively formed between the two ends of the guide cover and the second connecting head. A plurality of second air guide holes connecting the second expansion chamber and the third expansion chamber are arranged in the middle part of the guide cover, and the air outlet is connected to the third expansion chamber.

[0007] Furthermore, a second sealing ring is provided between the air guide cover and the end of the second connector.

[0008] Furthermore, the air guide cover and the exhaust cover are detachably connected.

[0009] Furthermore, the ignition tool outer shell is provided with a ferrule, and the ferrule abuts against the bottle mouth of the compressed gas cylinder.

[0010] Furthermore, the silencer assembly includes an air inlet pipe, a silencer pipe, a porous pipe and an air outlet pipe, the air inlet pipe is connected to one end of the silencer pipe, the porous pipe is arranged in the silencer pipe, the length of the porous pipe corresponds to the length of the silencer pipe, the inner diameter of the air inlet pipe is smaller than the inner diameter of the porous pipe, a sound absorption cavity is formed between the porous pipe and the silencer pipe, a plurality of through holes are arranged on the porous pipe to connect the sound absorption cavity with the internal space of the porous pipe, the air outlet pipe is connected to the other end of the silencer pipe, and the inner diameter of the air outlet pipe is smaller than the inner diameter of the porous pipe.

[0011] Furthermore, sound-absorbing cotton is arranged in the sound-absorbing cavity.

[0012] Furthermore, the air inlet pipe and the silencer pipe are integrally formed, and a limiting boss is arranged on the outer side of the end of the air outlet pipe.

[0013] Furthermore, the air outlet is arranged on the side of the exhaust component, the silencer component is arranged parallel to the compressed gas cylinder, and the adapter is a right-angle adapter.

[0014] Compared with the prior art, the wearable gas generator of the present invention has the beneficial effect of filtering and silencing high-pressure gas, reducing the noise of the gas generator during operation, and improving the safety of the gas generator, so that it is more suitable for use in wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0017] Figure 3 is a cross-sectional view of a second embodiment of the present invention;

[0018] Figure 4 It is an exploded view of the present invention.

[0019] Explanation of numbers in the figure: 10. Compressed gas cylinder, 20. Exhaust assembly, 21. Exhaust hood, 211. First connector, 212. Second connector, 213. First sealing ring, 214. Second sealing ring, 22. Guide cover, 23. Ignition device, 231. Ring, 24. First expansion chamber, 25. Second expansion chamber, 26. First air guide hole, 27. Air outlet, 28. Third expansion chamber, 29. Second air guide hole, 30. Silencer assembly, 31. Air inlet pipe, 32. Silencer pipe, 33. Multi-porous pipe, 34. Air outlet pipe, 35. Sound absorbing chamber, 36. Through hole, 37. Limiting boss, 40. Adapter. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0021] Reference Figure 1 As shown, it is a cross-sectional view of an embodiment of a wearable gas generator of the present invention. The gas generator of the present invention includes a compressed gas cylinder 10, an exhaust assembly 20 and a silencer assembly 30. The exhaust assembly 20 is used to open the compressed gas cylinder 10 and filter the high-pressure gas that rushes out. The filtered high-pressure gas enters the inflation device after being silenced by the silencer assembly 30 to inflate the inflation device. In an embodiment of the present invention, in order to reduce the space occupied by the gas generator, the silencer assembly 30 is arranged in parallel with the compressed gas cylinder 10. At this time, in order to facilitate the connection between the silencer assembly 30 and the exhaust assembly 20, the gas outlet 27 is arranged on the side of the exhaust assembly 20, and the adapter 40 is a right-angle adapter 40. In other embodiments of the present invention, the relative position of the silencer assembly 30 and the exhaust assembly 20 can be determined according to the actual setting position of the gas cylinder, and then the appropriate gas outlet 27 position and adapter 40 shape can be set.

[0022] Specifically, refer to Figure 2 The figure is a cross-sectional view of an embodiment of the present invention. In this embodiment, the exhaust assembly 20 includes an exhaust hood 21 and a guide hood 22. One end of the exhaust hood 21 is connected to the compressed gas cylinder 10 and a first expansion chamber 24 is formed therebetween. An igniter 23 is disposed in the exhaust hood 21 and communicates with the first expansion chamber 24. The guide hood 22 is sleeved outside the exhaust hood 21. The joint of the igniter 23 extends out of the exhaust hood 21 and the guide hood 22. A second expansion chamber 25 is formed between the guide hood 22 and the exhaust hood 21. A plurality of first air guide holes 26 disposed around the igniter 23 communicate with the first expansion chamber 24 and the second expansion chamber 25. The second expansion chamber 25 is connected with an air outlet 27. The silencer assembly 30 is connected to the air outlet 27 via an adapter 40.

[0023] When all components are installed, the connector of the ignition device 23 is conveniently connected to the connector of the external control system. The control system controls the ignition device 23 to explode. The ignition device 23 is close to the bottle mouth of the compressed gas cylinder 10. The impact force of the explosion of the ignition device 23 can instantly break through the bottle mouth of the compressed gas cylinder 10, and the high-pressure gas in the compressed gas cylinder 10 is released. The gas enters the first expansion chamber 24 and enters the second expansion chamber 25 through the first air guide hole 26. Since the first air guide hole 26 is distributed around the ignition device 23, that is, the first air guide hole 26 does not correspond to the bottle mouth of the compressed gas cylinder 10, the gas of the compressed gas cylinder 10 can only pass through the first air guide hole 26 after rushing out and diffusing to the periphery of the first expansion chamber 24. In this process, since the fragments of the bottle mouth of the compressed gas cylinder 10 will not turn, part of the fragments are filtered. In addition, since the diameter of the first air guide hole 26 is small and the air guide holes are spaced apart, another part of the fragments are filtered. After the gas enters the second expansion chamber 25, it flows out from the gas outlet 27. Since the first gas guide hole 26 is provided with a circle, when the gas outlet 27 does not correspond to the first gas guide hole 26, a part of the debris is filtered to ensure the safety of the gas rushing out and prevent the presence of debris in the gas from damaging the inflatable device. At the same time, since the inner diameter of the first expansion chamber 24 is larger than the first gas guide hole 26, and the inner diameter of the first gas guide hole 26 is smaller than the second expansion chamber 25, during the propagation of the sound wave in the exhaust assembly 20, a part of the sound wave is blocked in the exhaust assembly 20 due to the chamber reflection, and the initial silencing is achieved. In order to further reduce the volume of the explosion of the ignition device 23 breaking through the compressed gas cylinder 10 and the high-pressure gas rushing out, the gas enters the silencer assembly 30 after flowing out of the second expansion chamber 25, and the silencer assembly 30 further performs silencing to ensure that the gas rushes out at a low decibel, reduce the impact on people when the inflatable device is inflated, and prevent the violent bursting sound from scaring the user. At the same time, since the ignition tool 23 is arranged in the exhaust hood 21, a circle of first air guide holes 26 are arranged on the outer periphery of the ignition tool 23, that is, there is a thick barrier between the ignition tool 23 and the outside world, which can ensure that the explosion of the ignition tool 23 will not affect the external user, and the first air guide hole 26 has the effect of blocking heat, ensuring that the heat generated by the explosion of the ignition tool 23 will not be transmitted to the user, which greatly increases the safety of the gas generator and ensures that the gas generator of the present invention is suitable for wearable devices. In order to further improve the efficiency of the ignition tool 23 breaking through the compressed gas cylinder 10 and to converge the impact force when the ignition tool 23 explodes, the outer shell of the ignition tool 23 is provided with a ring 231, and the ring 231 abuts against the bottle mouth of the compressed gas cylinder 10. The inner diameter of the ring 231 is smaller than the mouth of the compressed gas cylinder 10, and the igniter 23 is surrounded by the ring 231. The range where the ring 231 abuts is the weakest position of the mouth of the compressed gas cylinder 10. The shock wave generated when the igniter 23 explodes is limited to the space surrounded by the ring 231, the exhaust hood 21 and the mouth of the compressed gas cylinder 10. Since the mouth of the compressed gas cylinder 10 is the weakest, it can be quickly broken through to release the high-pressure gas.

[0024] Reference Figure 3 and Figure 4 As shown, in order to facilitate the extension of the connector of the ignition device 23 to connect with the outside world and to minimize the volume of the exhaust assembly 20 to be suitable for wearable devices, the exhaust hood 21 includes a first connector 211 and a second connector 212. The first connector 211 is sleeved on the outside of the compressed gas cylinder 10, and the air guide 22 is sleeved on the outside of the second connector 212. The ignition device 23 is arranged in one end where the second connector 212 and the first connector 211 are connected. The air guide 22 and the first connector 211 are abutted, and a first sealing ring 213 is arranged between the two. At this time, it is only necessary to set the connector of the ignition device 23 to extend out of the second connector 212, and the air guide 22 can be set to have the same outer diameter as the exhaust hood 21. When the air guide 22 presses the first connector 211, the air guide 22 and the exhaust hood 21 are connected in place, which is convenient for installation.

[0025] Furthermore, the middle of the deflector 22 is connected to the middle of the second connector 212, and the second expansion chamber 25 and the third expansion chamber 28 are formed between the deflector 22 and the two ends of the second connector 212, respectively. The middle of the deflector 22 is provided with a plurality of second air guide holes 29 connecting the second expansion chamber 25 and the third expansion chamber 28, and the gas outlet 27 is connected to the third expansion chamber 28. In this case, the high-pressure gas in the compressed gas cylinder 10 is sprayed into the first expansion chamber 24. Since the diameter of the first air guide hole 26 is small, the fragments of the compressed gas cylinder 10 brought out by the gas are blocked by the first air guide hole 26 and will not be sprayed out. The gas enters the second expansion chamber 25 through the first air guide hole 26. Since the size of the second expansion chamber 25 is large, the gas escapes after entering the small diameter air guide hole, further preventing a part of the fragments from passing through the second air guide hole 29, that is, the gas entering the third expansion chamber 28 is pure gas, ensuring the filtering effect of the fragments. In this embodiment, the gas outlet 27 is arranged on the side of the exhaust assembly. Since the airflow rushes out along the axial direction of the exhaust component 20, when the air outlet 27 is set on the side, the airflow needs to turn, and the debris in the airflow is pressed by the airflow on the top surface of the exhaust component 20, and the debris cannot turn, thereby further improving the debris filtering effect. At the same time, due to the multiple changes in the chamber size, the silencing effect of the gas when passing through the exhaust component 20 is further improved. In this embodiment, in order to ensure the sealing of the second expansion chamber 25 and the third expansion chamber 28, a first sealing ring 213 is provided between the guide cover 22 and the first joint, and a second sealing ring 214 is provided between the guide cover 22 and the end of the second connector 212.

[0026] Since the gas generator is provided with an ignition device 23, the ignition device 23 needs to be connected to an external control system. Therefore, in the prior art, after the gas generator is used once, the entire device including the gas generator needs to be returned to the factory for gas cylinder reset, which is time-consuming, labor-intensive, and costly. In the present invention, in order to facilitate users to replace gas cylinders by themselves, the connector of the ignition device 23 is set to directly extend out of the exhaust assembly 20, so that the user can connect the ignition device 23 to the external control system by directly plugging the connector. This embodiment also provides a detachable connection between the deflector 22 and the exhaust hood 21, such as a threaded connection. After the gas generator is used once, the compressed gas cylinder 10 and the ignition device 23 need to be replaced. Since the ignition device 23 is arranged between the exhaust hood 21 and the compressed gas cylinder 10, the user separates the exhaust hood 21 from the guide cover 22, that is, removes the gas cylinder and the ignition device 23 at the same time, and then combines the new compressed gas cylinder 10 and the exhaust hood 21 and installs the guide cover 22 to complete the replacement of the compressed gas cylinder 10 and the ignition device 23. The replacement is convenient, which greatly saves time and cost.

[0027] In the present invention, in order to reduce the volume of high-pressure gas when rushing out, a silencer assembly 30 is provided. The silencer assembly 30 includes an air inlet pipe 31, a silencer pipe 32, a porous pipe 33 and an air outlet pipe 34. The air inlet pipe 31 is connected to one end of the silencer pipe 32. The porous pipe 33 is arranged in the silencer pipe 32. The length of the porous pipe 33 corresponds to the length of the silencer pipe 32. The inner diameter of the air inlet pipe 31 is smaller than the inner diameter of the porous pipe 33. A sound absorption cavity 35 is formed between the porous pipe 33 and the silencer pipe 32. A plurality of through holes 36 are provided on the porous pipe 33 to connect the sound absorption cavity 35 with the internal space of the porous pipe 33. The air outlet pipe 34 is connected to the other end of the silencer pipe 32. The inner diameter of the air outlet pipe 34 is smaller than the inner diameter of the porous pipe 33.

[0028] The air inlet pipe 31 is connected to the air outlet 27 through an adapter 40. The high-pressure gas and sound waves enter the porous tube 33 after passing through the air inlet pipe 31. Since the inner diameter of the air inlet pipe 31 is smaller than the inner diameter of the porous tube 33, that is, the high-pressure gas enters the porous tube 33 with a large diameter from the air inlet pipe 31 with a small diameter, the gas velocity decreases and the pressure increases. At the same time, the sound waves also enter the porous tube 33 with a large diameter from the air inlet pipe 31 with a small diameter. As a result, a part of the sound waves can only be reflected back and forth on the wall of the porous tube 33 and cannot pass through the air outlet pipe 34 to achieve the purpose of silencing. In this embodiment, since there are a number of through holes 36 on the porous tube 33, there is a sound absorption cavity 35 between the porous tube 33 and the silencer tube 32. In addition, a part of the sound waves pass through the through holes 36 and are reflected back and forth in the sound absorption cavity 35 and cannot pass through, thereby further improving the noise reduction and silencing effect of the silencer tube 32. The high-pressure gas continues to rush out from the outlet pipe 34. Since the inner diameter of the outlet pipe 34 is smaller than the inner diameter of the porous pipe 33, more sound waves are blocked from being transmitted, thereby achieving a further noise reduction effect. In this embodiment, by changing the inner diameter of the gas transmission pipeline and setting more chambers, the sound waves cannot be transmitted, thereby achieving a noise reduction effect. The structure is simple and the noise reduction and silencing effect is good. In order to allow the sound waves to be further absorbed in the sound absorption cavity 35, sound-absorbing cotton is arranged in the sound absorption cavity 35. Therefore, the sound waves entering the noise reduction pipe may also be absorbed by the sound-absorbing cotton, further improving the noise reduction effect. In this embodiment, for the convenience of processing, the air inlet pipe 31 and the muffler pipe 32 are integrally formed. Since the size of the porous pipe 33 is larger than that of the air inlet pipe 31 and the air outlet pipe 34, the air outlet pipe 34 is arranged separately for the convenience of setting the porous pipe 33 in the muffler pipe 32. The gas generator of this embodiment is used to inflate the airbag. In order to facilitate the fixing of the airbag, a limiting boss 37 is arranged on the outer side of the end of the air outlet pipe 34. The airbag is sleeved outside the silencer assembly 30, and the airbag is fixed to the air outlet pipe 34 by a cable tie. Due to the blocking of the limiting boss 37, the stability of the airbag connection can be ensured. In this embodiment, the airbag is connected to the silencer assembly 30, so that the exhaust assembly 20 can be exposed to the outside, which is convenient for the user to replace the gas cylinder. In other embodiments of the invention, the air outlet 27 can also be provided with other connection methods such as threads.

[0029] When the present invention is working, the air inlet of the airbag is tied tightly with the silencer assembly 30, and the silencer assembly 30 is fixed to the wearable device, so that the exhaust assembly 20 is exposed to the pocket or other position of the wearable device. At this time, since the gas cylinder and the exhaust assembly 20 are both located in a position accessible to the user, the user can easily replace the gas generator after use. When in use, the ignition device 23 explodes and breaks through the bottle mouth of the compressed gas cylinder 10. The high-pressure gas passes through the first expansion chamber 24, the first air guide hole 26, the second expansion chamber 25, the second air guide hole 29, the third expansion chamber 28, the adapter 40, the air inlet pipe 31, and the silencer pipe 32, and finally discharged from the air outlet pipe 34. By using the size changes of each cavity hole, the debris and sound waves in the gas are filtered, the reaction of the gas generator when working is reduced, and the safety of the gas generator is ensured, so that the gas generator of the present invention is more suitable for use with wearable devices.

[0030] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A wearable gas generator, characterized in that: It comprises a compressed gas cylinder, an exhaust assembly and a silencer assembly, wherein the exhaust assembly comprises an exhaust hood and a flow guide hood, one end of the exhaust hood is connected to the compressed gas cylinder and a first expansion chamber is formed therebetween, an igniter is arranged in the exhaust hood and communicates with the first expansion chamber, the flow guide hood is sleeved outside the exhaust hood, a joint of the igniter extends out of the exhaust hood and the flow guide hood, a second expansion chamber is formed between the flow guide hood and the exhaust hood, a plurality of first air guide holes arranged around the igniter communicate with the first expansion chamber and the second expansion chamber, the second expansion chamber is connected with an air outlet, and the silencer assembly is connected to the air outlet via an adapter; The inner diameter of the first expansion cavity is larger than that of the first air guide hole, and the inner diameter of the first air guide hole is smaller than that of the second expansion cavity; The muffler assembly comprises an air inlet pipe, a muffler pipe, a porous pipe and an air outlet pipe, the air inlet pipe is connected to one end of the muffler pipe, the porous pipe is arranged in the muffler pipe, the length of the porous pipe corresponds to the length of the muffler pipe, the inner diameter of the air inlet pipe is smaller than the inner diameter of the porous pipe, a sound absorption cavity is formed between the porous pipe and the muffler pipe, a plurality of through holes are arranged on the porous pipe to connect the sound absorption cavity with the inner space of the porous pipe, the air outlet pipe is connected to the other end of the muffler pipe, and the inner diameter of the air outlet pipe is smaller than the inner diameter of the porous pipe; The air outlet is arranged on the side of the exhaust component, the silencer component is arranged in parallel with the compressed gas cylinder, and the adapter is a right-angle adapter.

2. A wearable gas generator as claimed in claim 1, characterized in that: The exhaust hood includes a first connector and a second connector, the first connector is sleeved on the outside of the compressed gas cylinder, the deflector is sleeved on the outside of the second connector, the ignition device is arranged in one end where the second connector is connected to the first connector, the deflector is against the first connector, and a first sealing ring is arranged between the two.

3. A wearable gas generator as claimed in claim 2, characterized in that: The middle part of the air guide cover is connected to the middle part of the second connecting head, and a second expansion chamber and a third expansion chamber are respectively formed between the air guide cover and the two ends of the second connecting head. A plurality of second air guide holes connecting the second expansion chamber and the third expansion chamber are arranged in the middle part of the air guide cover, and the air outlet is connected to the third expansion chamber.

4. A wearable gas generator as claimed in claim 3, characterized in that: A second sealing ring is arranged between the air guide cover and the end of the second connecting head.

5. A wearable gas generator as claimed in claim 1, characterized in that: The air guide cover is detachably connected to the exhaust cover.

6. A wearable gas generator as claimed in claim 1, characterized in that: The ignition tool outer shell is provided with a ferrule, and the ferrule abuts against the bottle mouth of the compressed gas cylinder.

7. A wearable gas generator as claimed in claim 1, characterized in that: Sound-absorbing cotton is arranged in the sound-absorbing cavity.

8. A wearable gas generator as claimed in claim 1, characterized in that: The air inlet pipe and the muffler pipe are integrally formed, and a limiting boss is arranged on the outer side of the end of the air outlet pipe.

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