Gas generator and fall protection device

Abstract

The invention relates to the technical field of gas production, in particular to a gas generator and a tumble protection device. The gas generator comprises a shell, an igniter, a high-pressure gas cylinder, a pressure guide pipe and a piston; an exhaust hole is formed in the shell; one end of the pressure guide pipe is connected with the output end of the igniter, and the other end of the pressure guide pipe directly faces the sealed end of the high-pressure gas cylinder and is separated from the sealed end of the high-pressure gas cylinder, so that a gas guide cavity is formed between the sealed end of the high-pressure gas cylinder and the end part of the pressure guide pipe; the piston is sleeved on the pressure guide pipe, is movably arranged in the movable cavity along the axis of the pressure guide pipe, and is at least provided with a first position and a second position; when the piston is located at the first position, the exhaust hole and the air guide cavity are blocked by the piston; and when the pressure guide pipe is located at the second position, the exhaust hole is communicated with the air guide cavity. The gas generator can reduce noise generated during working, so that a user or people in a use range can be prevented from being influenced by high-frequency noise, and the situation that the use of the gas generator is restricted due to the noise problem is avoided.

Description

Technical Field

[0001] The present invention relates to the field of gas production technology, in particular to a gas generator and a fall protection device. Background Art

[0002] Cold air gas generators are generally used in the field of human protection. They can be used to inflate fall protection airbags, but they will produce huge short-term noise at the moment of being activated. The noise can generally reach 110-120 decibels. Such noise can cause serious fright and hearing damage to users, thus seriously restricting the application of the product. Summary of the invention

[0003] The objects of the present invention include, for example, providing a gas generator and a fall protection device which can reduce the noise generated during operation, thereby preventing the user or people within the use range from being affected by high-frequency noise, thereby avoiding restrictions on their use due to noise problems.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a gas generator, the gas generator comprising a housing, an igniter, a high-pressure gas cylinder, a pressure pipe and a piston;

[0006] The shell is provided with an exhaust hole; the igniter and the high-pressure gas cylinder are respectively connected to the two ends of the shell;

[0007] The pressure-conducting tube is arranged in the shell, and the outer wall of the pressure-conducting tube is spaced from the inner wall of the shell to form an active cavity; one end of the pressure-conducting tube is connected to the output end of the igniter, and the other end of the pressure-conducting tube is directly opposite to the sealing end of the high-pressure gas cylinder and is spaced from the sealing end of the high-pressure gas cylinder to form a gas-conducting cavity between the sealing end of the high-pressure gas cylinder and the end of the pressure-conducting tube;

[0008] The piston is sleeved on the pressure-conducting tube and is movably disposed in the movable chamber along the axis of the pressure-conducting tube, and has at least a first position and a second position;

[0009] When the piston is in the first position, the exhaust hole and the air guiding cavity are blocked by the piston; when the pressure guiding tube is in the second position, the exhaust hole is connected to the air guiding cavity.

[0010] In an optional embodiment, the pressure-conducting tube is provided with at least one air-conducting hole connecting the interior of the pressure-conducting tube with the active chamber. When the piston is in the first position, one end of the air-conducting hole connecting with the active chamber is blocked by the piston, or the piston is located between the air-conducting hole and the exhaust hole along the axial direction of the pressure-conducting tube.

[0011] In an optional embodiment, the gas guide hole is located at one end of the pressure guiding tube close to the high-pressure gas cylinder.

[0012] In an optional embodiment, the pressure conducting tube is provided with a plurality of air conducting holes, and the plurality of air conducting holes are arranged around the axis of the pressure conducting tube or along the axis of the pressure conducting tube.

[0013] In an optional embodiment, a buffer member for abutting against the piston in the second position is provided on the outer periphery of the pressure guiding tube along the axial direction of the pressure guiding tube.

[0014] In an optional embodiment, the igniter includes an electric igniter and an ignition cover; the electric igniter is connected to the ignition cover, the ignition cover is connected to the shell, and the pressure pipe is connected to the ignition cover and is directly opposite to the output end of the electric igniter.

[0015] In an optional embodiment, a first sealing ring is provided between the contact surfaces of the piston and the housing, and an installation groove for installing the first sealing ring is provided on the inner wall of the housing.

[0016] In an optional embodiment, a second sealing ring is provided between the contact surfaces of the piston and the pressure guiding tube.

[0017] In an optional embodiment, the high-pressure gas cylinder is threadedly connected to the housing.

[0018] In a second aspect, the present invention provides a fall protection device, which includes the above-mentioned gas generator.

[0019] The beneficial effects of the embodiments of the present invention include:

[0020] The gas generator includes a shell, an igniter, a high-pressure gas cylinder, a pressure-conducting pipe and a piston; the shell is provided with an exhaust hole; the igniter and the high-pressure gas cylinder are connected to the two ends of the shell respectively; the pressure-conducting pipe is arranged in the shell, and the outer wall of the pressure-conducting pipe is spaced from the inner wall of the shell to form an active cavity; one end of the pressure-conducting pipe is connected to the output end of the igniter, and the other end of the pressure-conducting pipe is directly opposite to the sealing end of the high-pressure gas cylinder and is spaced from the sealing end of the high-pressure gas cylinder to form an air-conducting cavity between the sealing end of the high-pressure gas cylinder and the end of the pressure-conducting pipe; the piston is sleeved on the pressure-conducting pipe and can be movably arranged in the active cavity along the axis of the pressure-conducting pipe, and has at least a first position and a second position; wherein, when the piston is in the first position, the exhaust hole and the air-conducting cavity are blocked by the piston; when the pressure-conducting pipe is in the second position, the exhaust hole is connected to the air-conducting cavity. The gas generator can reduce the noise generated during operation, thereby preventing the user or people within the use range from being affected by high-frequency noise, thereby avoiding the restriction of its use due to noise problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a gas generator in an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of a gas generator in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A partial schematic diagram of

[0025] Figure 4 is a cross-sectional view of a gas generator in another embodiment of the present invention;

[0026] Figure 5 for Figure 4 A partial schematic diagram of .

[0027] Icons: 100-gas generator; 110-housing; 120-igniter; 130-high-pressure gas cylinder; 140-pressure pipe; 150-piston; 111-exhaust hole; 101-active chamber; 102-gas guide chamber; 141-gas guide hole; 160-buffer; 121-electric igniter; 122-ignition cover; 170-first sealing ring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0034] Please refer to Figure 1-Figure 3 , this embodiment provides a gas generator 100, the gas generator 100 includes a housing 110, an igniter 120, a high-pressure gas cylinder 130, a pressure pipe 140 and a piston 150;

[0035] The shell 110 is provided with an exhaust hole 111; the igniter 120 and the high-pressure gas cylinder 130 are respectively connected to two ends of the shell 110;

[0036] The pressure-conducting tube 140 is disposed in the housing 110, and the outer wall of the pressure-conducting tube 140 is spaced from the inner wall of the housing 110 to form an active cavity 101; one end of the pressure-conducting tube 140 is connected to the output end of the igniter 120, and the other end of the pressure-conducting tube 140 is directly opposite to the sealed end of the high-pressure gas cylinder 130, and is spaced from the sealed end of the high-pressure gas cylinder 130, so as to form a gas-conducting cavity 102 between the sealed end of the high-pressure gas cylinder 130 and the end of the pressure-conducting tube 140;

[0037] The piston 150 is sleeved on the pressure-conducting tube 140 and is movably disposed in the movable chamber 101 along the axis of the pressure-conducting tube 140 , and has at least a first position and a second position;

[0038] When the piston 150 is in the first position, the exhaust hole 111 and the air guiding cavity 102 are blocked by the piston 150 ; when the pressure guiding tube 140 is in the second position, the exhaust hole 111 is connected to the air guiding cavity 102 .

[0039] Please refer to Figure 1-Figure 3 , the working principle of the gas generator 100 is:

[0040] The gas generator 100 includes a housing 110, an igniter 120, a high-pressure gas cylinder 130, a pressure-conducting pipe 140 and a piston 150; the housing 110 is provided with an exhaust hole 111; the igniter 120 and the high-pressure gas cylinder 130 are respectively connected to both ends of the housing 110; the igniter 120 is used to open the sealed end of the high-pressure gas cylinder 130 under the triggering action of an external structure, so that the high-pressure gas cylinder 130 releases high-pressure gas; and the exhaust hole 111 on the housing 110 can discharge the high-pressure gas for use in a conducting state;

[0041] On the basis of the above structure, when installing the pressure-conducting tube 140, the pressure-conducting tube 140 is arranged in the shell 110, and the outer wall of the pressure-conducting tube 140 is spaced from the inner wall of the shell 110 to form an active cavity 101; one end of the pressure-conducting tube 140 is connected to the output end of the igniter 120, and the other end of the pressure-conducting tube 140 is directly opposite to the sealed end of the high-pressure gas cylinder 130, and is spaced from the sealed end of the high-pressure gas cylinder 130, so as to form a gas-conducting cavity 102 between the sealed end of the high-pressure gas cylinder 130 and the end of the pressure-conducting tube 140; thus, through such an arrangement, after the igniter 120 is triggered, the sealed end of the high-pressure gas cylinder 130 is opened through the igniter 120, so that the high-pressure gas in the high-pressure gas cylinder 130 enters the gas-conducting cavity 102;

[0042] The piston 150 is sleeved on the pressure-guiding tube 140 and is movably arranged in the movable chamber 101 along the axis of the pressure-guiding tube 140, and has at least a first position and a second position; wherein, when the piston 150 is in the first position, the exhaust hole 111 and the gas-guiding chamber 102 are blocked by the piston 150; when the pressure-guiding tube 140 is in the second position, the exhaust hole 111 is communicated with the gas-guiding chamber 102; before use, the piston 150 is assumed to be in the first position. Since the exhaust hole 111 and the gas-guiding chamber 102 are blocked by the piston 150 when the piston 150 is in the first position, after the sealed end of the high-pressure gas cylinder 130 is opened and the high-pressure gas in the high-pressure gas cylinder 130 enters the gas-guiding chamber 102, under the action of the pressure of the high-pressure gas, the piston 150 can slide relative to the pressure-guiding tube 140, thereby sliding from the first position to the second position, thereby communicating the exhaust hole 111 with the gas-guiding chamber 102, thereby allowing the high-pressure gas in the gas-guiding chamber 102 to be discharged through the exhaust hole 111 for use;

[0043] As can be seen from the above content, when the igniter 120 is started and the sealed end of the high-pressure gas cylinder 130 is opened, the exhaust hole 111 and the gas guide cavity 102 are in a blocked state, that is, the inside and outside of the gas generator 100 are in a relatively isolated state. Therefore, at the moment when the igniter 120 is started and the sealed end of the high-pressure gas cylinder 130 is opened, the sound waves of the igniter 120 explosion and the high-speed airflow hitting the sealed end of the high-pressure gas cylinder 130 are all sealed inside the shell 110, that is. The high-frequency noise sound waves generated will be sealed in the gas generator 100 by the piston 150, so that the generated noise can be absorbed by the main structure of the gas generator 100, so that the sharp high-frequency sound waves will be significantly reduced after being absorbed by the shell 110 and other structures, and the operating noise generated after the piston 150 moves from the first position to the second position is reduced. Therefore, the gas generator 100 can reduce the noise generated during operation, thereby preventing the user or people within the use range from being affected by the high-frequency noise, and thus avoiding the restriction of its use due to noise problems.

[0044] It should be noted that, firstly, based on the above content, when the pressure-conducting tube 140 is provided, the pressure-conducting tube 140 can guide the movement of the piston 150, so that the piston 150 changes its position between the first position and the second position. At the same time, on this basis, it can form a space for the high-pressure gas to be discharged and for the piston 150 to move, that is, an active chamber 101 can be formed for the piston 150 to move, and for the high-pressure gas in the gas-conducting chamber 102 to flow to the exhaust hole 111; secondly, since one end of the pressure-conducting tube 140 is connected to the output end of the igniter 120, and the other end is directly opposite to the output end of the igniter 120, The output end of the high-pressure gas cylinder 130, therefore, the pressure-conducting tube 140 can also open the sealed end of the high-pressure gas cylinder 130 when the igniter 120 is in a working state to release the high-pressure gas; in addition, through the setting of the pressure-conducting tube 140, it is set in the shell 110, so that at the moment when the gas generator 100 is working, the shell 110, the pressure-conducting tube 140 and the related mounting structure can absorb the high-frequency noise generated at the moment of its working, which is beneficial to reduce the high-frequency noise generated, thereby improving the user experience.

[0045] For further information, please refer to Figure 1-Figure 3 Based on the above content, it can be known that when the gas generator 100 is working, after the sealed end of the high-pressure gas cylinder 130 is opened, the high-pressure gas inside it will be released into the gas guide cavity 102. In this case, the high-pressure gas in the gas guide cavity 102 can push the piston 150 to move after flowing into the active cavity 101, and after the piston 150 moves from the first position to the second position, it is discharged from the exhaust hole 111. Based on this, the flow direction of the high-pressure gas is the high-pressure gas cylinder 130, the gas guide cavity 102, the active cavity 101 and the exhaust hole 111;

[0046] On this basis, please refer to Figure 4 and Figure 5 , and combined with Figure 1-Figure 3 In other embodiments of the present invention, the pressure guiding tube 140 is provided with at least one air guide hole 141 that connects the interior of the pressure guiding tube 140 with the active chamber 101, so that the high-pressure gas in the air guiding chamber 102 can also flow into the active chamber 101 through the air guide hole 141 after flowing into the pressure guiding tube 140; based on this, in the process of use, the piston 150 in the first position can block the air guide hole 141 and the exhaust hole 111 to prevent the noise generated by the gas generator 100 at the moment of working from leaking to the outside, therefore, when the piston 150 is in the first position, the air guide hole 141 is connected to the active chamber 101. One end of the passage is blocked by the piston 150, or the piston 150 is located between the air hole 141 and the exhaust hole 111 along the axial direction of the pressure-conducting tube 140; that is, when adopting the technical solution with the air hole 141, the air hole 141 can be arranged in the area where the piston 150 in the second position contacts the pressure-conducting tube 140, so that the air hole 141 and the active chamber 101 are directly blocked by the piston 150, and the piston 150 can also be located directly between the air hole 141 and the exhaust hole 111 along the axial direction of the pressure-conducting tube 140, so that the exhaust hole 111 and the air hole 141 are blocked by blocking the active chamber 101.

[0047] Based on the structure of setting up the air guide hole 141, the air guide hole 141 can be located at the end of the pressure guiding tube 140 close to the high-pressure gas cylinder 130. In this way, the end of the pressure guiding tube 140 close to the high-pressure gas cylinder 130 is in the first position or is located, which is beneficial to reduce the distance of the high-pressure gas flowing from the air guiding cavity 102 to the contact with the piston 150, thereby improving the sensitivity of the piston 150.

[0048] In addition, it should be noted that when the air guide holes 141 are provided, the air guide holes 141 can increase the flow rate of the high-pressure gas flowing from the air guide cavity 102 into the active cavity 101. Therefore, the pressure-conducting tube 140 can be provided with a plurality of air guide holes 141, and the plurality of air guide holes 141 are arranged around the axis of the pressure-conducting tube 140 or arranged along the axis of the pressure-conducting tube 140. That is, when the air guide holes 141 are provided, the number and arrangement form thereof can be adaptively adjusted according to the requirements of use, and the shapes thereof can be of different styles.

[0049] For further information, please refer to Figure 1-Figure 3In the present embodiment, when the piston 150 moves from the first position to the second position, it moves under the pressure of the high-pressure gas. Based on this, in order to avoid the piston 150 from generating impact noise when it moves from the first position to the second position, a buffer 160 is provided on the outer periphery of the pressure guiding tube 140 along the axial direction of the pressure guiding tube 140 for abutting against the piston 150 in the second position. Through the provision of the buffer 160, the impact energy of the piston 150 when it moves from the first position to the second position can be absorbed, thereby reducing the operating noise of the piston 150.

[0050] Based on the above, please refer to Figure 1-Figure 3 In this embodiment, when the igniter 120 is set, the igniter 120 includes an electric igniter 121 and an ignition cover 122; the electric igniter 121 is connected to the ignition cover 122, the ignition cover 122 is connected to the housing 110, and the pressure pipe 140 is connected to the ignition cover 122, and is directly opposite to the output end of the electric igniter 121. Therefore, when the igniter 120 is working, the electric igniter 121 is excited by an external signal source, and the airflow accompanied by high-temperature combustible particles hits the seal of the high-pressure gas cylinder 130, breaking the seal, and the high-pressure gas rushes out of the high-pressure gas cylinder 130, pushing the piston 150 to move toward the end of the ignition cover 122, that is, from the first position to the second position. It should be noted that in other embodiments of the present invention, the igniter 120 can also adopt other types of structures.

[0051] For further information, please refer to Figure 1-Figure 3 In this embodiment, in order to improve the airtightness inside the gas generator 100, a first sealing ring 170 is provided between the contact surface of the piston 150 and the housing 110, and the inner wall of the housing 110 is provided with a mounting groove for mounting the first sealing ring 170. Similarly, a second sealing ring is provided between the contact surface of the piston 150 and the pressure-conducting tube 140, and the second sealing ring can be connected to the outer wall of the pressure-conducting tube 140 or the inner wall of the piston 150.

[0052] Furthermore, during use, in order to simplify the structure of the gas generator 100 , the high-pressure gas cylinder 130 is threadedly connected to the housing 110 .

[0053] Based on the above, please refer to Figure 1-Figure 5The present invention also provides a fall protection device, which includes the above-mentioned gas generator 100. Taking the fall protection device including a protective airbag as an example, during use, the fall protection device can be triggered by the igniter 120 at the moment of falling, so that the gas generator 100 works, and the high-pressure gas released can be used as a gas source to quickly inflate the protective airbag to protect the user. In this process, it can be seen from the above content that through the above-mentioned structural setting, the noise during the operation process can be reduced, so that the user or people within the use range can be prevented from being affected by high-frequency noise, thereby avoiding the restriction of its use due to noise problems.

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A gas generator, characterized in that: The gas generator comprises a shell, an igniter, a high-pressure gas cylinder, a pressure pipe and a piston; The shell is provided with an exhaust hole; the igniter and the high-pressure gas cylinder are respectively connected to two ends of the shell; The pressure-conducting tube is arranged in the shell, and the outer wall of the pressure-conducting tube is spaced from the inner wall of the shell to form an active cavity; one end of the pressure-conducting tube is connected to the output end of the igniter, and the other end of the pressure-conducting tube is directly opposite to the sealing end of the high-pressure gas cylinder and is spaced from the sealing end of the high-pressure gas cylinder to form a gas-conducting cavity between the sealing end of the high-pressure gas cylinder and the end of the pressure-conducting tube; The piston is sleeved on the pressure-conducting tube and is movably disposed in the movable chamber along the axis of the pressure-conducting tube, and has at least a first position and a second position; Wherein, when the piston is in the first position, the exhaust hole and the air guiding cavity are blocked by the piston; when the pressure guiding tube is in the second position, the exhaust hole is connected to the air guiding cavity.

2. The gas generator according to claim 1, characterized in that: The pressure-conducting tube is provided with at least one air-conducting hole connecting the interior of the pressure-conducting tube with the active chamber. When the piston is in the first position, one end of the air-conducting hole connecting with the active chamber is blocked by the piston, or the piston is located between the air-conducting hole and the exhaust hole along the axial direction of the pressure-conducting tube.

3. The gas generator according to claim 2, characterized in that: The air guide hole is located at one end of the pressure guiding pipe close to the high-pressure gas cylinder.

4. The gas generator according to claim 2, characterized in that: The pressure-conducting tube is provided with a plurality of air-conducting holes, and the plurality of air-conducting holes are arranged around the axis of the pressure-conducting tube or along the axis of the pressure-conducting tube.

5. The gas generator according to claim 1, characterized in that: A buffer member for contacting with the piston at the second position is provided on the outer periphery of the pressure guiding tube along the axial direction of the pressure guiding tube.

6. The gas generator according to any one of claims 1 to 5, characterized in that: The igniter comprises an electric igniter and an ignition cover; the electric igniter is connected to the ignition cover, the ignition cover is connected to the shell, and the pressure-conducting tube is connected to the ignition cover and is directly opposite to the output end of the electric igniter.

7. The gas generator according to any one of claims 1 to 5, characterized in that: A first sealing ring is arranged between the contact surfaces of the piston and the housing, and an installation groove for installing the first sealing ring is arranged on the inner wall of the housing.

8. The gas generator according to any one of claims 1 to 5, characterized in that: A second sealing ring is arranged between the contact surfaces of the piston and the pressure guiding tube.

9. The gas generator according to any one of claims 1 to 5, characterized in that: The high-pressure gas cylinder is threadedly connected to the shell.

10. A fall protection device, characterized in that: The fall protection device comprises a gas generator as claimed in any one of claims 1-9.

Images