CN111516633A - Pyrotechnic gas generator for safety air bag - Google Patents
Pyrotechnic gas generator for safety air bag Download PDFInfo
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- CN111516633A CN111516633A CN202010414328.3A CN202010414328A CN111516633A CN 111516633 A CN111516633 A CN 111516633A CN 202010414328 A CN202010414328 A CN 202010414328A CN 111516633 A CN111516633 A CN 111516633A
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- Prior art keywords
- shell
- gas generator
- cup body
- filter
- pyrotechnic gas
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- 239000003814 drug Substances 0.000 claims description 22
- 229940079593 drug Drugs 0.000 claims description 13
- 239000011888 foil Substances 0.000 claims description 12
- 239000007769 metal material Substances 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 239000010960 cold rolled steel Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000001746 injection moulding Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 229910052755 nonmetal Inorganic materials 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 description 23
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- NDEMNVPZDAFUKN-UHFFFAOYSA-N guanidine;nitric acid Chemical compound NC(N)=N.O[N+]([O-])=O.O[N+]([O-])=O NDEMNVPZDAFUKN-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26029—Ignitors
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
The invention relates to the technical field of gas generators, in particular to a pyrotechnic gas generator for an airbag, wherein a filter adopts a design mode of being equal to the upper shell in height, the lower shell adopts a double-cup structure, the lower shell is provided with a first cup body and a second cup body, the first cup body is internally provided with the filter, the upper shell is connected with an opening of the first cup body of the lower shell, the bottom surface of the lower shell is provided with an igniter seat, the igniter seat is internally provided with an igniter, the igniter shell is connected to the igniter seat, the igniter shell is provided with at least one ignition hole, and a middle-hole columnar gas generation tablet with the radius ratio of a long shaft to a short shaft larger than 1 is arranged in a. Compared with the prior art, the invention improves the filtering efficiency of the filter and simultaneously reduces the output slope of the initial pressure of the pyrotechnic gas generator.
Description
Technical Field
The invention relates to the technical field of gas generators, in particular to a pyrotechnic gas generator for an air bag.
Background
The gas generator is a key component in the field of passive safety of automobiles. The traditional gas generator structure generally adopts a cup-shaped lower shell with a built-in filter, the filter is formed by molding a low-carbon steel wire, an igniter seat is embedded in the lower shell, an igniter and an ignition shell are embedded in the igniter seat, the ignition shell, the igniter seat, the upper shell, the lower shell and the filter form a gas and drug generating chamber, and a cylindrical gas and drug generating chamber is generally arranged in the gas and drug generating chamber, as shown in fig. 2.
The pyrotechnic gas generator adopting the cup-shaped lower shell has the advantages that the flowing characteristic that gas flow tends to an exhaust port is realized, the height of a filter screen of the gas generator with the traditional structure is approximately equal to that of the generator, the exhaust hole of the generator with the traditional structure is designed on the upper shell, and only a filter part which is overlapped with the upper shell in height plays a role in filtering residues generated by combustion of gas producing medicaments due to the flowing characteristic of gas, so that a part of power of the filter is lost, and the miniaturization and the light weight of the gas generator are not facilitated.
Because the filter utilization is not high, if the gas purity is improved, the weight of the filter is increased, and the whole gas generator is large in size and weight and heavy. In addition, the gas generating chamber of the existing pyrotechnic gas generator is filled with cylindrical gas generating powder, when the ignition powder acts on the gas generating powder, all the gas generating powder is ignited at one time, and the gas generating powder is not combusted in stages, so that the initial slope output of the pyrotechnic gas generator is too high, the initial slope is too high, the impact on the pyrotechnic gas generator is great, and the failure of the gas generator is easily caused. In order to realize that the initial slope of the gas generator is lower and avoid larger impact and failure on the gas generator, a novel gas generating medicine structure is designed to realize staged combustion characteristics.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and designs a novel pyrotechnic gas generator by changing the structure and the layout of a filter and the shape structure of a gas generating agent to realize staged combustion, thereby improving the filtering efficiency of the filter, reducing the initial output slope of the gas generator, and realizing small size, light weight and reliable work of the gas generator.
In order to achieve the purpose, the pyrotechnic gas generator for the safety airbag comprises an upper shell, a filter, a lower shell, an igniter seat, an igniter, an ignition shell, a gas generating agent and an ignition agent, wherein the igniter seat is embedded in the lower shell, the lower shell is of a double-cup structure and consists of a first cup body and a second cup body, the inner diameter of the first cup body is larger than that of the second cup body; the upper shell is connected to the opening of the first cup body; the bottom surface of the first cup body and the inner surface of the bottom of the upper shell tightly press the upper end surface and the lower end surface of the filter; the gas and drug producing chamber is composed of the inner surface of the bottom of the upper shell, the second cup body, the outer surface of the igniter seat, the outer surface of the igniter shell and the inner surface of the filter.
The technical scheme of the invention is as follows: a pyrotechnic gas generator for an airbag comprises an upper shell, a filter, a lower shell, an igniter seat, an igniter, an ignition shell, a gas generating agent and an ignition agent, wherein the igniter seat is embedded in the lower shell, the lower shell is of a cup body structure with an outward opening flanging, and the upper shell is fixedly connected with the outer end face of the flanging structure; the inner surface of the bottom of the upper shell and the flanging structure tightly press the upper end surface and the lower end surface of the filter; the gas and drug producing chamber is composed of the inner surface of the bottom of the upper shell, the side wall of the lower shell, the outer surface of the igniter seat, the outer surface of the igniter shell and the inner surface of the filter.
Preferably, the gas-producing drug arranged in the gas-producing drug chamber is in a shape of a middle-hole column, and the radius ratio of a long axis to a short axis of a column-shaped cross section is more than 1.
Preferably, the inner diameter of the middle hole is more than or equal to 1mm and less than or equal to 3mm, and the radius ratio of the long axis to the short axis is more than or equal to 1.5 and less than or equal to 4.
Preferably, the filter is coaxial with the first cup.
Preferably, the filter is formed by rolling more than one layer of metal material plate, and the thickness of each layer of metal material plate is 0.1-1.0 mm.
Preferably, each layer of metal material plate of the filter is uniformly provided with vent holes, and the diameter of each vent hole is not more than 0.5 mm.
Preferably, the ratio of the height of the filter to the height of the first bowl is greater than 10.
Preferably, the upper shell is a cup body which is reversely buckled relative to the lower shell, more than one vent hole is uniformly arranged on the side wall of the cup body, and the inner surface of the side wall of the cup body is adhered with a sealing foil which covers the vent hole.
Preferably, the sealing foil is made of copper foil, aluminum foil, lead foil or non-metal material.
Preferably, the inner diameter of the upper shell and the outer diameter of the opening of the first cup body are in interference fit and welded into a whole.
Preferably, the thickness of the upper shell and the lower shell is 1.0 mm-2.0 mm, and the material is a cold-rolled steel plate with the tensile strength of more than 300 MPa.
Preferably, the ignition shell is of a long cylindrical structure, and more than one fire transfer hole is uniformly arranged on the side wall of the long cylindrical structure.
Preferably, the thickness of the ignition shell is 0.5 mm-1.5 mm, and a cold-rolled steel plate with the tensile strength of more than 300MPa is used as the material.
Preferably, the lower shell and the igniter seat are formed into a whole in a nylon injection molding mode.
Preferably, the igniter seat is inserted into the lower shell, and the combined parts of the igniter seat and the lower shell are in interference fit and are connected into a whole by a welding mode.
Preferably, the ignition housing is integrally connected to the igniter base by means of metal deformation of the igniter base.
Compared with the prior art, the invention has the beneficial effects that:
the height ratio of the filter to the lower shell of the pyrotechnic generator in the prior art is generally not more than 3, and only the filter part which is higher than the lower shell and is overlapped with the upper shell has the function of filtering residues generated by combustion of gas-producing medicaments, so the filtering efficiency of the filter is generally not more than 60%; according to the invention, the lower shell adopts a double-cup design and is provided with the first cup body and the second cup body, the height ratio of the filter to the first cup body can be more than 10, and therefore, the filtering efficiency of the filter is more than 90%.
In addition, the gas production medicine which is in a shape of a middle-hole column and has the radius ratio of the long axis to the short axis larger than 1 is adopted, so that the staged combustion of the medicine type is realized, the initial output slope of the gas generator is reduced, and the impact and the failure on the gas generator are avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a view showing the shape of a gas generating agent of the conventional pyrotechnic gas generator;
FIG. 3 is a gas generant shape in accordance with the present invention;
FIG. 4 is a schematic illustration of the combustion process of the gas generant composition of the invention;
FIG. 5 is a schematic view of a gas-generating agent type of the present invention and a combustion surface curve of an original gas-generating agent type;
FIG. 6 is a graph showing the output slope of the pyrotechnic gas generators in accordance with the embodiments and comparative examples of the present invention;
fig. 7 and fig. 8 and 9 respectively show structural schematic diagrams of variants of the invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1, 3 and 4, the invention comprises an upper shell, a lower shell, an igniter seat, an igniter, an ignition shell, a filter, an ignition charge and a gas generating charge, wherein the igniter seat is embedded in the lower shell, the igniter seat is connected with the ignition shell, the lower shell 3 adopts a double-cup design and is provided with a first cup body 3-1 and a second cup body 3-2, the upper shell 1 is connected with an opening of the first cup body 3-1, the filter 2 is arranged in the first cup body, the inner surface of the bottom of the upper shell 1, the second cup body 3-2, the outer surface of the igniter seat 5, the outer surface of the ignition shell 7 and the inner surface of the filter 2 form a gas generating charge chamber 4, the gas generating charge chamber 4 is internally provided with the gas generating charge 10, and the ignition shell is internally provided with the ignition.
In a preferred embodiment of the invention, the upper shell 1 is in an inverted cup shape, more than one vent hole 1-1 is uniformly arranged on the side wall of the cup body, and the inner surface of the side wall of the cup body is adhered with a sealing foil 11 which covers the vent hole 1-1. The ignition shell 7 is of a long cylindrical structure, and more than one fire transfer hole 7-1 is uniformly arranged on the side wall of the long cylindrical structure.
The invention relates to a metal component of a pyrotechnic gas generator: the upper shell 1, the lower shell 3 and the ignition shell 7 are all made of low-carbon steel through stretching, the thickness of the upper shell and the lower shell is usually 1.0-2.0 mm, cold-rolled steel plates with the tensile strength of more than 300MPa are used as materials, and the carbon content is required to be less than 0.2%. The thickness of the ignition shell 7 is generally 0.5 mm-1.5 mm, the material is cold-rolled steel plate with tensile strength more than 300MPa, and the carbon content is required to be less than 0.2%. The filter 2 is made by rolling more than one layer of metal material plate, each layer of metal material plate is uniformly provided with a certain number of vent holes with certain shapes, the diameter of each vent hole is generally not more than 0.5mm, the thickness of each layer of metal material plate is 0.1 mm-1.0 mm, and in the embodiment, a gap is left between the outer surface of the filter 2 and the side wall of the upper shell 1 as shown in figure 1. The sealing foil 11 is made of copper foil, aluminum foil, lead foil or non-metal material. The igniter base 5 can be machined by low-carbon steel according to requirements and is formed by machining, the igniter base 5 is inserted into the lower shell 4, the combined part of the igniter base and the lower shell is in interference fit, and the assembled igniter base and the lower shell are connected into a whole by adopting a laser welding mode; the lower shell 3 and the igniter seat 5 can be formed into a whole through injection molding when the nylon injection molding mode is adopted, so that the sealing reliability is ensured, and the machining cost of the igniter seat is saved.
The ignition case 7 of the pyrotechnic gas generator of the present invention is integrally connected to the igniter base 5 by metal deformation. The filter 2 is arranged in the first cup body 3-1 of the lower shell 3, the filter 2 and the first cup body 3-1 are coaxial, and the filter 2 is tightly attached to the bottom surface of the first cup body 3-1 and the bottom surface of the upper shell 1. The upper shell 1 and the lower shell 3 are connected in a laser welding mode, the inner diameter of the upper shell 1 is matched with the outer diameter of an opening of the first cup body 3-1 of the lower shell 3 in an interference fit mode, and the assembled upper shell and the assembled lower shell are connected into a whole in the laser welding mode.
In order to reduce the output slope of the gas generator in the early stage, the impact and the failure of the gas generator are avoided. According to the invention, on the basis that the lower shell is designed into a double-cup structure, on the premise of not limiting the formula of the gas production drug, a great deal of design is carried out on the shape of the gas production drug, and researches show that if the combustion of the gas production drug tablet can be divided into two stages, the first stage is approximately equal-surface combustion, and the second stage is reduced-surface combustion, the purpose can be well achieved. It has been found through extensive studies that a gas generant having a shape of a hollow cylinder with an elliptical cross-section and a ratio of major to minor axis radii in the cross-section of the cylinder greater than 1 (see fig. 3 and 4) can be combusted in the above two stages (e.g., the cross-section is elliptical, or other shape having major and minor axes). Referring to fig. 4 and 5, which show the combustion process and the combustion surface curve when the ratio of the minor axis to the major axis of the gas generant composition is 1.6, it can be seen that the inventive gas generant composition achieves staged combustion, wherein the conventional combustion has only one stage, wherein the combustion of the conventional composition is completed 50 time units later, and wherein the inventive gas generant composition has a second stage combustion 50 time units later, wherein the staged combustion reduces the initial output slope of the generator.
Conclusive suggestions are made that the specific value of the ratio of the radius of the long axis to the short axis is calculated according to the requirements of the system on the output of the pyrotechnic gas generator and the loading of the gas generant composition, and the thickness of the gas generant composition can also be adjusted according to the requirements of the system on the output of the pyrotechnic gas generator. When the pyrotechnic gas generator works, the igniter 6 ignites the ignition charge 9, the ignition charge 9 burns rapidly, the gas production charge 10 in the combustion chamber 4 is ignited through the flame transfer hole 7-1, and the gas production charge 10 undergoes two combustion stages, namely a first combustion stage and a second combustion stage, and the proportion of the two combustion stages is adjusted, so that the initial output slope of the pyrotechnic gas generator is effectively reduced. The size of the middle hole in the shape of the gas generating agent is preferably selected in the range that the inner diameter of the middle hole is larger than or equal to 1mm and smaller than or equal to 3mm, and under the condition that the inner diameter of the middle hole is constant, the larger the ratio of the long axis to the short axis is, the longer the ratio of the second combustion stage is, and the lower the initial output slope is. The radius ratio of the long axis to the short axis is preferably selected to be more than or equal to 1.5 and less than or equal to 4 according to the requirement of the charging rate of the generator, the aeration effect of the generator is good, and the impact on the generator is small.
In the case of the pyrotechnic gas generator having the above-described structure, the filter efficiency of the pyrotechnic gas generator filter can be improved and the initial output gradient of the gas generator can be reduced without changing the gas generating composition and the weight of the filter. For example, in the pyrotechnic gas generator of the invention, 90 grams of guanidine nitrate gas-producing agent is assembled, and the radius ratio of the long axis to the short axis of the gas-producing agent is 1.5; the weight of the filter was 120 g, the ratio of the height of the filter to the height of the first bowl of the lower shell was 10, and the graph of the pyrotechnic gas generator measured in a 60L closed container at 23 c is shown in fig. 6. The filtration efficiency of the filter was 90%.
Comparative example
The pyrotechnic gas generator of the original structure is adopted, 90 g of disc-shaped gas producing medicament with the same weight is arranged in a gas producing medicament chamber, 120 g of a filter with the same weight is adopted, the height ratio of the filter to the lower shell is 2, and the curve measured by the pyrotechnic gas generator of the original structure in a 60L closed container at the same temperature of 23 ℃ is shown in figure 6. The filtering efficiency of the filter is 40-50%.
From the two curves shown in FIG. 6, it can be seen that the slope of the first 20ms pressure rise for the pyrotechnic gas generator of the example is significantly lower than the control with the same weight of gas generant. The filter of the pyrotechnic gas generator of the example had higher filtration efficiency than the control example.
Example 2
Fig. 7 shows an extended example of the present invention, which is based on embodiment 1, and the outer surface of the filter 2 has no gap with the side wall of the upper casing 1.
Example 3
A pyrotechnic gas generator for an airbag comprises an upper shell, a filter, a lower shell, an igniter seat, an igniter, an ignition shell, a gas generating agent and an ignition agent, wherein the igniter seat is embedded in the lower shell, the lower shell is of a cup body structure with an outward opening flanging (for convenience of expression, the former reference number is used in the example, 3-2 is that the main cup body structure of the lower shell is equivalent to a second cup body of the embodiment, and the flanging structure is equivalent to a first cup body 3-1 without a side wall), and the upper shell is fixedly connected with the outer end face of the flanging structure; the inner surface of the bottom of the upper shell and the flanging structure tightly press the upper end surface and the lower end surface of the filter; the gas and drug producing chamber is composed of the inner surface of the bottom of the upper shell, the side wall of the lower shell, the outer surface of the igniter seat, the outer surface of the igniter shell and the inner surface of the filter. In this example, the outer surface of the filter 2 has no gap with the side wall of the upper housing 1.
Example 4
This example is shown in fig. 9, and in embodiment 3, there is a gap between the outer surface of the filter 2 and the side wall of the upper case 1.
The invention has not been described in detail in part in the common general knowledge of a person skilled in the art.
Claims (17)
1. The utility model provides a pyrotechnic gas generator for air bag, includes casing, filter, lower casing, igniter seat, some firearm, ignition housing, produces gas powder, ignition powder down, and wherein the igniter seat inlays to be located the inferior valve internal, its characterized in that: the lower shell is of a double-cup structure and consists of a first cup body and a second cup body with different inner diameters, and the inner diameter of the first cup body is larger than that of the second cup body; the upper shell is connected to the opening of the first cup body; the bottom surface of the first cup body and the inner surface of the bottom of the upper shell tightly press the upper end surface and the lower end surface of the filter; the gas and drug producing chamber is composed of the inner surface of the bottom of the upper shell, the second cup body, the outer surface of the igniter seat, the outer surface of the igniter shell and the inner surface of the filter.
2. The utility model provides a pyrotechnic gas generator for air bag, includes casing, filter, lower casing, igniter seat, some firearm, ignition housing, produces gas powder, ignition powder down, and wherein the igniter seat inlays to be located the inferior valve internal, its characterized in that: the lower shell is a cup body structure with an outward opening, and the upper shell is fixedly connected with the outer end face of the flanging structure; the inner surface of the bottom of the upper shell and the flanging structure tightly press the upper end surface and the lower end surface of the filter; the gas and drug producing chamber is composed of the inner surface of the bottom of the upper shell, the side wall of the lower shell, the outer surface of the igniter seat, the outer surface of the igniter shell and the inner surface of the filter.
3. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the gas-producing medicine arranged in the gas-producing medicine chamber is in a shape of a middle-hole column, and the radius ratio of a long shaft to a short shaft of the column-shaped cross section is more than 1.
4. A pyrotechnic gas generator in accordance with claim 3, wherein: the inner diameter of the middle hole is more than or equal to 1mm and less than or equal to 3mm, and the radius ratio of the short axis of the long axis is more than or equal to 1.5 and less than or equal to 4.
5. A pyrotechnic gas generator in accordance with claim 1, wherein: the filter and the first cup body are coaxial.
6. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the filter is formed by rolling more than one layer of metal material plate, and the thickness of each layer of metal material plate is 0.1-1.0 mm.
7. A pyrotechnic gas generator in accordance with claim 6 wherein: each layer of metal material plate of the filter is uniformly provided with vent holes, and the diameters of the vent holes are not more than 0.5 mm.
8. A pyrotechnic gas generator as claimed in claim 1 or 5 in which: the ratio of the height of the filter to the height of the first bowl is greater than 10.
9. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the upper shell is a cup body which is reversely buckled relative to the lower shell, more than one vent hole is uniformly arranged on the side wall of the cup body, and the inner surface of the side wall of the cup body is adhered with a sealing foil which covers the vent hole.
10. A pyrotechnic gas generator in accordance with claim 9 wherein: the sealing foil is made of copper foil, aluminum foil, lead foil or non-metal materials.
11. A pyrotechnic gas generator in accordance with claim 9 wherein: the inner diameter of the upper shell and the outer diameter of the opening of the first cup body are in interference fit and are welded into a whole.
12. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the thickness of the upper shell and the lower shell is 1.0 mm-2.0 mm, and the material is a cold-rolled steel plate with the tensile strength of more than 300 MPa.
13. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the ignition shell is of a long cylindrical structure, and more than one fire transfer hole is uniformly formed in the side wall of the long cylindrical structure.
14. A pyrotechnic gas generator in accordance with claim 13 wherein: the thickness of the ignition shell is 0.5 mm-1.5 mm, and the ignition shell is made of a cold-rolled steel plate with the tensile strength of more than 300 MPa.
15. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the lower shell and the igniter seat form a whole in a nylon injection molding mode.
16. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the igniter seat is inserted into the lower shell, and the combined part of the igniter seat and the lower shell is in interference fit and is connected into a whole through a welding mode.
17. A pyrotechnic gas generator as claimed in claim 1 or 2 in which: the ignition shell is connected with the ignition shell into a whole in a metal deformation mode of the ignition seat.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010414328.3A CN111516633A (en) | 2020-05-15 | 2020-05-15 | Pyrotechnic gas generator for safety air bag |
| PCT/CN2021/075532 WO2021227576A1 (en) | 2020-05-15 | 2021-02-05 | Pyrotechnic gas generator for safety airbag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010414328.3A CN111516633A (en) | 2020-05-15 | 2020-05-15 | Pyrotechnic gas generator for safety air bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111516633A true CN111516633A (en) | 2020-08-11 |
Family
ID=71907639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010414328.3A Pending CN111516633A (en) | 2020-05-15 | 2020-05-15 | Pyrotechnic gas generator for safety air bag |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111516633A (en) |
| WO (1) | WO2021227576A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021227576A1 (en) * | 2020-05-15 | 2021-11-18 | 湖北航鹏化学动力科技有限责任公司 | Pyrotechnic gas generator for safety airbag |
| WO2021227578A1 (en) * | 2020-05-15 | 2021-11-18 | 湖北航鹏化学动力科技有限责任公司 | Gas generator |
| CN114251981A (en) * | 2022-01-07 | 2022-03-29 | 湖南洪源远大科技有限公司 | Anti-unmanned aerial vehicle group ammunition |
| JP7449432B2 (en) | 2019-08-09 | 2024-03-13 | 株式会社ダイセル | gas generator |
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| CN111516633A (en) * | 2020-05-15 | 2020-08-11 | 湖北航鹏化学动力科技有限责任公司 | Pyrotechnic gas generator for safety air bag |
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| CN1461271A (en) * | 2001-04-10 | 2003-12-10 | 日本化药株式会社 | Gas generator |
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| CN213920948U (en) * | 2020-05-15 | 2021-08-10 | 湖北航鹏化学动力科技有限责任公司 | Pyrotechnic gas generator for safety air bag |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7449432B2 (en) | 2019-08-09 | 2024-03-13 | 株式会社ダイセル | gas generator |
| WO2021227576A1 (en) * | 2020-05-15 | 2021-11-18 | 湖北航鹏化学动力科技有限责任公司 | Pyrotechnic gas generator for safety airbag |
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| CN114251981A (en) * | 2022-01-07 | 2022-03-29 | 湖南洪源远大科技有限公司 | Anti-unmanned aerial vehicle group ammunition |
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| Publication number | Publication date |
|---|---|
| WO2021227576A1 (en) | 2021-11-18 |
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