Gas generator with portable igniter

Abstract

The utility model relates to a gas generator with a portable igniter, which comprises an outer shell, a filter screen, a gas producing area and an ignition area from outside to inside, the outer shell comprises an upper shell and a lower shell, and the igniter is arranged in the middle of the lower shell and corresponds to the position in the ignition area; the igniter comprises an ignition tube, a plastic support and a short circuit assembly, the plastic support is cylindrical, and a first groove which is sunken downwards is formed in the center of the top of the plastic support and used for containing the ignition tube; the center of the lower part of the plastic support is provided with a second groove which is sunken upwards and is used for accommodating and installing the short-circuit assembly; a plurality of penetrating channels are arranged between the bottom of the first groove and the top of the second groove and used for penetrating through a connecting line between the ignition tube and the short circuit assembly. An upwards-sunken installation position is arranged at the position, corresponding to the igniter, of the lower shell, the installation position is in a hollow vertical barrel shape, the vertical barrel side wall surrounds the outer side of the lower middle portion of the plastic support, the barrel top of the installation position is inserted into the middle of the plastic support, and therefore the plastic support is fixedly connected with the lower hole.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive gas generators, and particularly relates to a gas generator containing a lightweight igniter. Background Art

[0002] A gas generator for inflating an airbag in an automobile is an important device to ensure the safety of vehicle occupants. At present, there are mainly two types of gas generators: tube type and disc type. Among them, the disc-type gas generator is small in size, has an integrated design, and is widely used. The disc-type gas generator is welded with the upper shell and the lower shell corresponding up and down. An igniter is welded in the middle of the lower shell to ignite the ignition charge in the shell. A conventional igniter is provided with a steel support. The ignition tube and the short-circuit component are installed in the steel support. A tube seat is sleeved outside the steel support, and the outside of the tube seat is welded to the lower shell again. During installation, the steel support and the ignition tube need to be riveted once, the tube seat and the steel support need to be riveted once, and the tube seat and the lower shell need to be welded once. The process is complex and each step needs to meet the corresponding installation requirements to ensure the stable connection between the igniter and the lower shell. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is that the conventional igniter in the gas generator has a steel support to support the internal ignition components. The outside of the steel support is connected to the outer shell of the gas generator through a tube seat. The structure is complex and it is necessary to design the riveting structure between the steel support and the ignition tube, the riveting structure between the tube seat and the steel support, and finally weld the tube seat to the outer shell. The installation process is complex, the cost is high, and the production efficiency is not high.

[0004] The utility model provides a gas generator containing a lightweight igniter, which includes an outer shell, a filter screen, a gas generation area, and an ignition area from outside to inside. The outer shell includes an upper shell and a lower shell. An igniter is provided at the middle part of the lower shell and corresponding to the inside of the ignition area.

[0005] The igniter includes an ignition tube, a plastic support, and a short-circuit component. The plastic support is cylindrical as a whole. The center of the top of the plastic support has a first groove sunken downward for accommodating and installing the ignition tube. The center of the lower part of the plastic support has a second groove sunken upward for accommodating and installing the short-circuit component. There are several through channels between the bottom of the first groove and the top of the second groove for passing the connection line between the ignition tube and the short-circuit component.

[0006] The lower shell is provided with an upwardly sunken installation position corresponding to the igniter. The installation position is a hollow vertical cylindrical shape. The vertical barrel side wall of the installation position surrounds the outside of the middle and lower parts of the plastic support. The barrel top of the installation position is inserted into the middle of the plastic support, so as to fixedly connect the plastic support to the lower hole.

[0007] Optionally, the lower shell is cylindrical with an empty top surface. In the center of the bottom surface of the lower shell is an empty mounting hole for installing an igniter. The bottom end of the barrel side wall of the mounting position is connected to the edge of the mounting hole, and the mounting position and the lower shell are integrally formed. The top surface of the mounting position is annular and is provided with a number of downwardly concave positioning grooves I. The number of positioning grooves I is arranged in a circle, and this circle is concentric with the top surface of the mounting position. The number of positioning grooves I is evenly distributed along the circumference of this circle.

[0008] Optionally, at the position corresponding to the top surface of the mounting position of the plastic support, there is a horizontally inwardly concave mounting groove. Inside the mounting groove, there are a number of downwardly concave positioning grooves II. The top surface of the mounting position is inserted into the mounting groove, and the positioning groove I is inserted into the positioning groove II, and the positioning groove I and the positioning groove II correspond to each other one by one.

[0009] Optionally, both the upper shell and the filter net are cylindrical. The bottom surface of the upper shell is empty. After the upper shell and the lower shell are butt-jointed and welded up and down, a closed outer shell is formed. On the side wall of the upper shell, there are a number of exhaust holes for discharging the gas produced in the gas production area to inflate the airbag.

[0010] The filter net is vertically arranged. The top of the filter net is connected to the top surface of the upper shell, and the bottom is connected to the bottom surface of the lower shell. There is a certain distance between the mesh surface of the filter net and the inner walls of the upper shell and the lower shell, and the distance is 1 - 2.5 mm. After the gas in the gas production area is filtered by the filter net, it is then discharged through the exhaust holes.

[0011] Further optionally, a number of exhaust holes are evenly distributed on the side wall of the upper shell. At the position corresponding to the exhaust holes on the inner wall of the side wall of the upper shell, there is an aluminum foil that shields the exhaust holes to play a moisture-proof role. When gas is produced in the gas production area, the gas breaks through the aluminum foil and is discharged through the exhaust holes.

[0012] Optionally, the ignition area is cylindrical and the gas production area is annular. The gas production area surrounds the outside of the ignition area. The gas production area is filled with gas-producing agent, and the ignition area is filled with ignition agent. At the bottom of the gas production area, there is a metal lower cover. At the top of the ignition area and the gas production area, there is a metal upper cover. Between the ignition area and the gas production area, there is a cartridge. The top of the cartridge is provided with a cartridge cover for protecting the ignition area. The side wall of the cartridge is provided with a number of air holes, so that the heat, flame and gas generated in the ignition area are discharged into the gas production area through the air holes to ignite the gas-producing agent.

[0013] Further optionally, the metal lower cover is annular with an empty top surface. The bottom surface is closely attached to the bottom surface of the lower shell corresponding to the gas production area. The side walls on both sides of the metal lower cover are respectively closely attached to the barrel side wall of the mounting position and the bottom of the filter net, reducing the impact of strong air pressure on the lower shell.

[0014] The metal upper cover is flat cylindrical with an empty bottom surface. The top surface is closely attached to the bottom surface of the upper shell corresponding to the gas production area and the ignition area. The side wall of the metal upper cover is closely attached to the top of the filter net, reducing the impact of strong air pressure on the upper shell.

[0015] Further optionally, the cartridge is cylindrical, with an open bottom allowing the igniter to extend into the ignition area. The bottom of the cartridge is fixedly connected to the outer side of the side wall of the mounting barrel. The top of the cartridge is provided with an edge extending horizontally towards the gas generation area, and this edge closely adheres to the top surface of the metal upper cover.

[0016] The medicine cover is cylindrical, with its bottom surface facing the ignition area and the bottom surface being vacant. The top surface of the medicine cover closely adheres to the top surface of the metal upper cover, and the side surface of the medicine cover closely adheres to the side wall of the cartridge.

[0017] Further optionally, a circular washer is provided at the top of the gas generation area. The top of the washer closely adheres to the horizontal edge at the top of the cartridge. The two side walls of the washer respectively closely adhere to the outer side surface of the cartridge and the inner side surface of the metal upper cover. The washer is made of fiberglass. The washer can not only fix the top edge of the cartridge, thereby stabilizing the cartridge and the metal upper cover, but also form a buffer zone to protect the metal upper cover and the upper shell.

[0018] The gas generator containing a lightweight igniter of the present utility model has the following beneficial effects:

[0019] (1) Reduced the traditional steel support, reducing costs;

[0020] (2) Replaced the steel support with a plastic support, reducing the probability of generating metal chips and improving product quality;

[0021] (3) Reduced the assembly process, reducing the investment in product production equipment and the production cost per unit at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the gas generator containing a lightweight igniter;

[0023] Figure 2 It is a schematic diagram of the igniter.

[0024] In the drawings, 1 - filter screen, 2 - gas generation area, 3 - ignition area, 4 - upper shell, 5 - lower shell, 6 - ignition tube, 7 - plastic support, 8 - short - circuit component, 9 - first groove, 10 - second groove, 11 - mounting position, 12 - mounting hole, 13 - first positioning groove, 14 - second positioning groove, 15 - mounting groove, 16 - exhaust hole, 17 - air outlet hole, 18 - aluminum foil, 19 - metal upper cover, 20 - metal lower cover, 21 - cartridge, 22 - medicine cover, 23 - washer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] This embodiment provides a gas generator containing a lightweight igniter. As Figure 1 - Figure 2 shown, from the outside to the inside, it includes a housing, a filter screen 1, a gas generation area 2, and an ignition area 3. The housing includes an upper shell 4 and a lower shell 5. An igniter is provided at the middle of the lower shell 5 and corresponding to the inside of the ignition area 3.

[0026] The igniter includes an ignition tube 6, a plastic support 7, and a short - circuit component 8. The plastic support 7 is generally cylindrical. In the center of the top of the plastic support 7, there is a first groove 9 that is recessed downward, which is used to accommodate and install the ignition tube 6. In the center of the lower part of the plastic support 7, there is a second groove 10 that is recessed upward, which is used to accommodate and install the short - circuit component 8. Between the bottom of the first groove 9 and the top of the second groove 10, there are several through - channels for passing the connection wires between the ignition tube 6 and the short - circuit component 8.

[0027] At the position corresponding to the igniter on the lower shell 5, there is an upward - recessed installation position 11. The installation position 11 is a hollow vertical cylindrical shape. The vertical barrel side wall of the installation position surrounds the outer side of the middle and lower parts of the plastic support 7. The top of the barrel of the installation position 11 is inserted into the middle of the plastic support 7, thereby fixedly connecting the plastic support 7 to the lower hole.

[0028] Optionally, the lower shell 5 is cylindrical and the top surface is vacant. In the center of the bottom surface of the lower shell 5, there is a vacant installation hole 12 for installing the igniter. The bottom end of the barrel side wall of the installation position 11 is connected to the edge of the installation hole 12. The installation position 11 and the lower shell 5 are integrally formed. The top surface of the installation position 11 is annular, and there are several downward - recessed positioning grooves one 13. The several positioning grooves one 13 are arranged in a circle, and this circle is concentric with the top surface of the installation position 11. The several positioning grooves one 13 are evenly distributed along the circumference of this circle.

[0029] Optionally, at the position of the plastic support 7 corresponding to the top surface of the installation position 11, there is a horizontally inward - recessed installation groove 15. In the installation groove 15, there are several downward - recessed positioning grooves two 14. The top surface of the installation position 11 is inserted into the installation groove 15, and the positioning groove one 13 is inserted into the positioning groove two 14, and the positioning groove one 13 and the positioning groove two 14 correspond one by one.

[0030] Optionally, the outer side surface of the middle and lower parts of the plastic support 7 is in close contact with the inner wall of the barrel side wall of the installation position 11. When manufacturing the plastic support 7, after the relative positions of the ignition tube 6, the short - circuit component 8, and the installation position 11 of the lower shell 5 are connected and set, they are integrally injection - molded to form the plastic support.

[0031] Optionally, both the upper shell 4 and the filter net 1 are cylindrical. The bottom surface of the upper shell 4 is vacant. After the upper shell 4 and the lower shell 5 are butt - jointed and welded up and down, a closed outer shell is formed. There are several exhaust holes 16 on the side wall of the upper shell 4, which are used to discharge the gas produced in the gas - generating area 2 to inflate the airbag.

[0032] The filter screen 1 is vertically arranged. The top of the filter screen 1 is connected to the top surface of the upper shell 4, and the bottom is connected to the bottom surface of the lower shell 5. There is a certain distance between the mesh surface of the filter screen 1 and the inner walls of the upper shell 4 and the lower shell 5, and the distance is 1 - 2.5 mm. After the gas in the gas production area 2 is filtered by the filter screen 1, it is then discharged through the exhaust holes 16.

[0033] The filter screen 1 intercepts most of the medicinal residues in the gas production area 2. The distance between the mesh surface of the filter screen 1 and the inner walls of the upper shell 4 and the lower shell 5 is significantly larger than that of the traditional disc-type gas generator, which can continue to intercept the medicinal residues, making the gas discharged through the exhaust holes 16 purer and the residue amount further reduced.

[0034] Further optionally, a plurality of exhaust holes 16 are evenly distributed on the side wall of the upper shell 4. Aluminum foils 18 are provided at the positions corresponding to the exhaust holes 16 on the inner wall of the side wall of the upper shell 4. The aluminum foils 18 shield the exhaust holes 16 to play a moisture-proof role. When the gas is produced in the gas production area 2, the gas breaks through the aluminum foils 18 and is discharged through the exhaust holes 16.

[0035] Optionally, the ignition area 3 is cylindrical, and the gas production area 2 is annular. The gas production area 2 surrounds the outside of the ignition area 3. The gas production area 2 is filled with gas-producing medicine, and the ignition area 3 is filled with ignition medicine; a metal lower cover 20 is provided at the bottom of the gas production area 2, and a metal upper cover 19 is provided at the top of the ignition area 3 and the gas production area 2; a cartridge case 21 is provided between the ignition area 3 and the gas production area 2. The top of the cartridge case 21 is provided with a medicine cover 22 for protecting the ignition area 3. A plurality of air holes 17 are provided on the side wall of the cartridge case 21, so that the heat, flame and gas generated in the ignition area 3 are discharged into the gas production area 2 through the air holes 17 to ignite the gas-producing medicine.

[0036] Further optionally, the metal lower cover 20 is annular, with the top surface vacant and the bottom surface closely attached to the bottom surface of the lower shell 5 corresponding to the gas production area 2. The side walls on both sides of the metal lower cover 20 are respectively closely attached to the barrel side wall of the installation position 11 and the bottom of the filter screen 1, reducing the impact of the strong air pressure on the lower shell 5;

[0037] The metal upper cover 19 is flat cylindrical, with the bottom surface vacant and the top surface closely attached to the bottom surface of the upper shell 4 corresponding to the gas production area 2 and the ignition area 3. The side wall of the metal upper cover 19 is closely attached to the top of the filter screen 1, reducing the impact of the strong air pressure on the upper shell 4.

[0038] Further optionally, the cartridge case 21 is cylindrical, with the bottom of the cartridge case 21 open to allow the igniter to extend into the ignition area 3. The bottom of the cartridge case 21 is fixedly connected to the outer side surface of the barrel side wall of the installation position 11. The top of the cartridge case 21 is provided with an edge extending horizontally towards the gas production area 2, and this edge is closely attached to the top surface of the metal upper cover 19;

[0039] The medicine cover 22 is cylindrical. The bottom surface of the medicine cover 22 faces the ignition area 3 and the bottom surface is vacant. The top surface of the medicine cover 22 is closely attached to the top surface of the metal upper cover 19, and the side surface of the medicine cover 22 is closely attached to the side wall of the cartridge case 21.

[0040] Further optionally, a circular washer 23 is provided at the top of the gas generating area 2. The top of the washer 23 is closely attached to the horizontal edge at the top of the cartridge case 21. The two side walls of the washer 23 are respectively closely attached to the outer side surface of the cartridge case 21 and the inner side surface of the metal upper cover 19. The washer 23 is made of glass fiber. The washer 23 can not only fix the top edge of the cartridge case 21, thereby stabilizing the cartridge case 21 and the metal upper cover 19, but also form a buffer zone to protect the metal upper cover 19 and the upper shell 4.

[0041] During use, the ignition tube 6 ignites the ignition charge in the ignition area 3. The heat, flame and gas generated are discharged into the gas generating area 2 through the air holes 17, igniting the gas generating charge in the gas generating area 2 to generate a large amount of gas. The gas is filtered by the filter net 1 and finally discharged into the airbag through the exhaust hole 16.

Claims

1. A gas generator with a portable igniter, characterized in that: From outside to inside, it includes an outer shell, a filter screen, a gas production area and an ignition area. The outer shell includes an upper shell and a lower shell. An igniter is provided in the middle of the lower shell and at a position corresponding to the inside of the ignition area. The igniter includes an ignition tube, a plastic support and a short-circuit assembly. The plastic support is cylindrical as a whole, and the center of the top of the plastic support is provided with a first groove which is sunken downwards and is used to accommodate and install the ignition tube. The center of the lower part of the plastic support is provided with a second groove which is recessed upwards and is used to accommodate and install the short-circuit assembly; a plurality of through-channels are provided between the bottom of the first groove and the top of the second groove and are used to pass through the connection line between the ignition tube and the short-circuit assembly; The lower shell is provided with an upwardly concave mounting position at a position corresponding to the igniter. The mounting position is in the shape of a hollow vertical barrel. The vertical barrel side wall of the mounting position surrounds the outer side of the middle and lower part of the plastic support. The barrel top of the mounting position is inserted into the middle part of the plastic support, thereby fixing the plastic support with the lower hole. The side wall of the upper shell is provided with a plurality of exhaust holes for discharging the gas produced in the gas production area to inflate the airbag; the filter screen is cylindrical and vertically arranged, the top of the filter screen is connected to the top surface of the upper shell, and the bottom of the filter screen is connected to the bottom surface of the lower shell. The mesh surface of the filter screen is at a certain distance from the inner wall of the upper shell and the inner wall of the lower shell, with a spacing of 1-2.5mm. The gas in the gas production area is filtered by the filter screen and then discharged from the exhaust holes.

2. The gas generator with a portable igniter according to claim 1, characterized in that: The lower shell is cylindrical, and the top surface is empty. The center of the bottom surface of the lower shell is an empty installation hole for installing the igniter. The bottom end of the barrel side wall of the installation position is connected to the edge of the installation hole. The installation position and the lower shell are integrally formed. The top surface of the installation position is annular and is provided with a plurality of downwardly recessed positioning grooves 1, the plurality of positioning grooves 1 are arranged in a circle, the circle is concentrically arranged with the top surface of the installation position, and the plurality of positioning grooves 1 are evenly distributed along the circumference of the circle.

3. The gas generator with a portable igniter according to claim 2, characterized in that: The plastic support is provided with a transverse inwardly recessed installation groove at a position corresponding to the top surface of the installation position, and a plurality of downwardly recessed positioning grooves 2 are provided in the installation groove. The top surface of the installation position is inserted into the installation groove, and positioning groove 1 is inserted into positioning groove 2, and positioning groove 1 corresponds to positioning groove 2 one by one.

4. The gas generator with a portable igniter according to claim 1, characterized in that: The upper shell is cylindrical, the bottom surface of the upper shell is empty, and the upper shell and the lower shell are butted up and down and then welded to form a closed shell.

5. The gas generator with a portable igniter according to claim 4, characterized in that: Several exhaust holes are evenly distributed on the side wall of the upper shell. Aluminum foil is provided on the inner wall of the upper shell side wall at the positions corresponding to the exhaust holes. The aluminum foil covers the exhaust holes to prevent moisture. When the gas producing area produces gas, the gas breaks through the aluminum foil and is discharged from the exhaust holes.

6. The gas generator with a portable igniter according to claim 1, characterized in that: The ignition zone is cylindrical, the gas production zone is annular, the gas production zone is surrounded by the outside of the ignition zone, the gas production zone is filled with gas production powder, and the ignition zone is filled with ignition powder; A metal lower cover is provided at the bottom of the gas production area, and a metal upper cover is provided at the top of the ignition area and the gas production area; a cartridge is provided between the ignition area and the gas production area, and a cartridge cover is provided on the top of the cartridge to protect the ignition area. A number of air outlet holes are provided on the side wall of the cartridge, so that the heat, flame and gas generated in the ignition area are discharged into the gas production area through the air outlet holes to ignite the gas producing powder.

7. The gas generator with a portable igniter according to claim 6, characterized in that: The metal lower cover is in a circular shape, with the top surface being empty and the bottom surface being in close contact with the bottom surface of the lower shell corresponding to the gas production area. The side walls on both sides of the metal lower cover are respectively in close contact with the barrel side wall and the bottom of the filter screen at the installation position, so as to reduce the impact of strong air pressure on the lower shell; The metal upper cover is in the shape of a flat cylinder, with an empty bottom and a top surface close to the bottom surface of the upper shell corresponding to the gas production area and the ignition area. The side wall of the metal upper cover is close to the top of the filter screen to reduce the impact of strong air pressure on the upper shell.

8. The gas generator with a portable igniter according to claim 6, characterized in that: The cartridge is cylindrical, with an open bottom to allow the igniter to extend into the ignition zone. The bottom of the cartridge is fixedly connected to the outer side of the side wall of the mounting barrel, and the top of the cartridge is provided with an edge extending horizontally toward the gas production zone, which is in close contact with the top surface of the metal upper cover.

9. The gas generator with a portable igniter according to claim 8, characterized in that: The medicine cover is cylindrical, the bottom surface of the medicine cover faces the ignition zone, and the bottom surface is empty, the top surface of the medicine cover is in close contact with the top surface of the metal upper cover, and the side surface of the medicine cover is in close contact with the side wall of the cartridge.

10. The gas generator with a portable igniter according to claim 9, characterized in that: A circular gasket is provided on the top of the gas production area, the top of the gasket is close to the horizontal edge of the top of the cartridge, and the side walls of the gasket are respectively close to the outer side of the cartridge and the inner side of the metal cover. The gasket is made of glass fiber. The gasket can not only fix the top edge of the cartridge and thus stabilize the cartridge and the metal cover, but also form a buffer zone to protect the metal cover and the upper shell.

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