Electric ignition tube and gas generator

Abstract

The utility model relates to the technical field of gas generators, in particular to an electric ignition tube and a gas generator. The electric ignition tube comprises a gunpowder cavity group, a tube body and an electrode tube group; a plurality of gunpowder cavities are arranged in the gunpowder cavity group, and each gunpowder cavity contains ignition powder and ignition powder; the tube body is sleeved outside the electrode tube group and the gunpowder cavity group, and the electrode tube group is propped against the ignition powder; wherein the electrode tube group is used for igniting the ignition charge in the plurality of gunpowder chambers at the same time or in stages. The electric ignition tube is applied to the gas generator, is simple in structure and convenient to mount, and can realize simultaneous or hierarchical control during ignition, so that the hierarchical gas production function of the gas generator is realized; and the structural size is small, and the occupied internal space of the gas generator can be reduced, so that the space utilization rate of the gas generator can be improved, and the manufacturing and using cost of the gas generator is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas generator, specifically, relate to an electric ignition tube and gas generator. BACKGROUND

[0002] The gas generator is the core module of the safety air bag, when the car collides, the ignition device will be excited, and the gas generator is prompted to produce gas, fills the safety air bag, and the ignition device excitation source is the electric ignition tube. In present, based on different collision direction, seat's before and after position and passenger's body shape etc. The application scene of the automobile safety air bag, or the working condition is different, to the function requirement of the safety air bag specifically, that is, the filling degree, filling size and filling time of the safety air bag need to be adjusted according to the working condition.

[0003] Based on this, for the gas generator, then need two-stage gas generator to realize different level working control, and its starting end is to use the grading ignition function of the ignition tube, but the two-stage gas generator currently all adopts two ignition tubes to carry out grading control. The use of two ignition tubes, this causes great influence on the structure layout design of the gas generator, the utilization rate of space and the cost. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of electric ignition tube and gas generator, its structure is simple, easy to install, and can realize ignition simultaneously or grading control, to realize the grading gas production function of gas generator further;And its structure volume is small, can reduce the internal space of gas generator occupied, to improve gas generator space utilization, reduce the manufacturing and use cost of gas generator.

[0005] The embodiment of the utility model can be realized as follows:

[0006] Firstly, the utility model provides a kind of electric ignition tube, electric ignition tube includes fire powder cavity group, pipe body and electrode tube group;

[0007] Fire powder cavity group is built-in with multiple fire powder chambers, and each fire powder chamber is accommodated with fire powder and ignition powder;

[0008] Pipe body is set in electrode tube group and fire powder cavity group outside, and electrode tube group and fire powder are resisted;

[0009] Wherein, electrode tube group is used to simultaneously or grading ignition fire powder in multiple fire powder chambers.

[0010] In optional implementation, electrode tube group includes first heating circuit and second heating circuit, fire powder cavity group includes first fire powder chamber and second fire powder chamber;

[0011] The first heating circuit is configured to ignite the first fire powder in the first fire powder chamber, and the second heating circuit is configured to ignite the second fire powder in the second fire powder chamber.

[0012] In an optional embodiment, the fire powder chamber group comprises a main pipe body, and a partition is arranged in the main pipe body to divide the main pipe body into the first fire powder chamber and the second fire powder chamber.

[0013] The electrode pipe group extends into the main pipe body and is in contact with the fire powder in the first fire powder chamber and the second fire powder chamber.

[0014] In an optional embodiment, the fire powder chamber group comprises a heat insulation member and two fire powder placing pipes.

[0015] The first fire powder chamber and the second fire powder chamber are arranged in the two fire powder placing pipes respectively, and the two fire powder placing pipes are separated by the heat insulation member.

[0016] The electrode pipe group extends into the two fire powder placing pipes and is in contact with the fire powder in the first fire powder chamber and the second fire powder chamber.

[0017] In an optional embodiment, the first heating circuit comprises a first electrode and a first heating bridge wire, the second heating circuit comprises a second electrode and a second heating bridge wire, and the electrode pipe group further comprises a connecting electrode.

[0018] The first electrode, the connecting electrode and the first heating bridge wire are connected in sequence, and the second electrode, the connecting electrode and the second heating bridge wire are connected in sequence.

[0019] The first heating bridge wire is in contact with the fire powder in the first fire powder chamber, and the second heating bridge wire is in contact with the fire powder in the second fire powder chamber.

[0020] In an optional embodiment, the first electrode and the second electrode are arranged around the connecting electrode, or the first electrode, the second electrode and the connecting electrode are arranged around the same axis.

[0021] In an optional embodiment, the electrode pipe group further comprises an insulator covering at least one of the first electrode, the second electrode and the connecting electrode to separate the first electrode, the second electrode and the connecting electrode.

[0022] In an optional embodiment, the connecting electrode comprises a first connecting electrode and a second connecting electrode; the first electrode, the first connecting electrode and the first heating bridge wire are connected in sequence; and the second electrode, the second connecting electrode and the second heating bridge wire are connected in sequence.

[0023] The first heating bridge wire is in contact with the fire powder in the first fire powder chamber, and the second heating bridge wire is in contact with the fire powder in the second fire powder chamber.

[0024] In an optional embodiment, the first electrode, the second electrode, the first connecting electrode and the second connecting electrode are arranged at intervals around the same axis.

[0025] In a second aspect, the utility model provides a gas generator, the gas generator includes main part and above -mentioned electric ignition tube,

[0026] The main body is provided with at least two combustion chambers containing gas generating agent, and the two powder chambers of the electric ignition tube correspond to one combustion chamber respectively, and the ignition powder in each powder chamber is used to ignite the gas generating agent in the corresponding combustion chamber.

[0027] The electric ignition tube and the gas generator provided by the utility model embodiment have the beneficial effects that:

[0028] The electric ignition tube comprises a powder chamber group, a tube body and an electrode tube group; the powder chamber group is internally provided with a plurality of powder chambers, and each powder chamber contains ignition powder and ignition powder; the tube body is sleeved outside the electrode tube group and the powder chamber group, and the electrode tube group is in abutment with the ignition powder; wherein the electrode tube group is used to simultaneously or stepwise ignite the ignition powder in the plurality of powder chambers. The electric ignition tube is applied to the gas generator, has simple structure, is convenient to install, can realize simultaneous or stepwise control of ignition, and thus realizes the stepwise gas generation function of the gas generator; moreover, the structure is small in size, can reduce the occupied internal space of the gas generator, and thus can improve the space utilization rate of the gas generator and reduce the manufacturing and use cost of the gas generator. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and thus should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can be obtained without the creative labor on the premise of the drawings.

[0030] Figure 1 The structure schematic view of the electric ignition tube provided by the embodiment;

[0031] Figure 2 The structure schematic view of the powder chamber group and the electrode tube group provided by the embodiment;

[0032] Figure 3 The structure schematic view of the powder chamber group provided by the embodiment;

[0033] Figure 4 The structure schematic view of the electrode tube group provided by the embodiment, wherein A is a plan view, and B is an elevation view;

[0034] Figure 5Structure schematic view of the first electrode, the second electrode and the connecting electrode provided in the embodiment when they are arranged around the same axis;

[0035] Figure 6 Structure schematic view of the first connecting electrode and the second connecting electrode provided in the embodiment, wherein A is a plan view and B is an elevation view;

[0036] Figure 7 Structure schematic view of the connecting electrode and the metal piece provided in the embodiment;

[0037] Figure 8 Structure schematic view of the first connecting electrode, the second connecting electrode and the metal piece provided in the embodiment.

[0038] Icon: 100 - electric ignition tube; 110 - group of powder chambers; 120 - tube body; 130 - group of electrode tubes; 111 - powder chamber; 112 - priming powder; 113 - ignition powder; 131 - first heating circuit; 132 - second heating circuit; 114 - first powder chamber; 115 - second powder chamber; 116 - main tube body; 117 - separator; 133 - first electrode; 134 - first heating bridge wire; 135 - second electrode; 136 - second heating bridge wire; 137 - connecting electrode; 138 - insulator; 139 - first connecting electrode; 141 - second connecting electrode; 142 - metal piece; 143 - metal subpart. DETAILED DESCRIPTION

[0039] And the advantages are more clear, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the utility model embodiments described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0041] It should be noted that: similar labels and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the utility model, it needs to explain, if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, or the orientation or positional relationship of the utility model product is usually placed, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element must have a specific orientation, a specific orientation structure and operation, therefore, it cannot be understood as a limitation of the utility model.

[0043] In addition, if the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0044] It needs to be explained that the features in the embodiments of the utility model can be combined with each other without conflict.

[0045] Please refer to Figures 1-3 The embodiment provides an electric ignition tube 100, the electric ignition tube 100 includes fire powder cavity group 110, tube body 120 and electrode tube group 130;

[0046] Fire powder cavity group 110 is built-in multiple fire powder chambers 111, and each fire powder chamber 111 is accommodated with fire powder 112 and ignition powder 113;

[0047] Tube body 120 is set on the outside of electrode tube group 130 and fire powder cavity group 110, and electrode tube group 130 and fire powder 112 are in abutment;

[0048] Wherein, electrode tube group 130 is used to simultaneously or fractionally ignite fire powder 112 in multiple fire powder chambers 111.

[0049] It needs to be explained that tube body 120 can adopt nylon or the like material to be covered in the outside of electrode tube group 130 and fire powder cavity group 110 in the mode of injection molding, so that fire powder cavity group 110, tube body 120 and electrode tube group 130 form integral structure.

[0050] Please refer to Figures 1-3 The working principle of the electric ignition tube 100 is:

[0051] The electric ignition tube 100 is applied to gas generator, and its role is to realize the fractionated gas production function of gas generator;

[0052] Specifically, the electric ignition tube 100 includes fire powder cavity group 110, tube body 120 and electrode tube group 130;

[0053] Wherein, fire powder cavity group 110 is built-in multiple fire powder chambers 111, and each fire powder chamber 111 is accommodated with fire powder 112 and ignition powder 113;

[0054] The tube body 120 is sleeved outside the electrode tube group 130 and the powder chamber group 110, and the electrode tube group 130 is in contact with the ignition powder 112; the electrode tube group 130 is used to simultaneously or hierarchically ignite the ignition powder 112 in the plurality of powder chambers 111;

[0055] Therefore, by applying the electric ignition tube 100 to the gas generator, the ignition powder 112 in the plurality of powder chambers 111 can be simultaneously or hierarchically ignited by the electrode tube group 130 during use, and the gas generating agent in the plurality of combustion chambers of the gas generator can be simultaneously or hierarchically gasified on the basis of the simultaneous or hierarchical ignition of the ignition powder 113.

[0056] Therefore, compared with the prior art of arranging a plurality of ignition tubes, the embodiment can realize simultaneous or hierarchical control of ignition by one electric ignition tube 100, thereby realizing the hierarchical gasification function of the gas generator, so that the structure for realizing hierarchical gasification can be simplified; and during installation, compared with the installation mode of a plurality of ignition tubes, the installation is more convenient, and the structure is smaller in size, so that the internal space of the gas generator can be reduced, thereby improving the space utilization rate of the gas generator and reducing the manufacturing and use cost of the gas generator.

[0057] Further, please refer to Figures 1-3 In the embodiment, when the electrode tube group 130 is arranged, it is known from the foregoing that, in order to realize hierarchical ignition and thereby realize hierarchical gasification, based on this, taking two-stage gasification as an example, the electrode tube group 130 includes a first heating circuit 131 and a second heating circuit 132, and the powder chamber group 110 correspondingly includes a first powder chamber 114 and a second powder chamber 115; wherein the first heating circuit 131 is used to correspondingly ignite the ignition powder 112 in the first powder chamber 114, and the second heating circuit 132 is used to correspondingly ignite the ignition powder 112 in the second powder chamber 115.

[0058] Therefore, by the above structure arrangement mode, two heating circuits can be arranged in the electrode tube group 130, and the two heating circuits are respectively the first heating circuit 131 and the second heating circuit 132; and correspondingly, the powder chamber group 110 is correspondingly provided with the first powder chamber 114 and the second powder chamber 115.

[0059] Further, by making the first heating circuit 131 correspondingly ignite the ignition powder 112 in the first powder chamber 114, and the second heating circuit 132 correspondingly ignite the ignition powder 112 in the second powder chamber 115, the independent control of the first heating circuit 131 and the second heating circuit 132 can be realized, thereby realizing simultaneous or hierarchical ignition, and thereby realizing hierarchical gasification when applied to the gas generator.

[0060] It should be noted that in the embodiment, the two-stage ignition is taken as an example for description, and based on the above structure, other stages of staged gas production can be realized by increasing the number of heating circuits and adjusting the number of corresponding powder chambers 111.

[0061] Please refer to Figure 4 , and in combination with Figures 1-3 , when the first heating circuit 131 and the second heating circuit 132 are configured, the first heating circuit 131 can include the first electrode 133 and the first heating bridge wire 134, the second heating circuit 132 can include the second electrode 135 and the second heating bridge wire 136, and the electrode tube group 130 further includes the connecting electrode 137; and the first electrode 133, the connecting electrode 137 and the first heating bridge wire 134 are connected in sequence; the second electrode 135, the connecting electrode 137 and the second heating bridge wire 136 are connected in sequence; wherein the first heating bridge wire 134 is in contact with the ignition powder 112 in the first powder chamber 114, and the second heating bridge wire 136 is in contact with the ignition powder 112 in the second powder chamber 115.

[0062] Therefore, through the above structure, in the case of power supply, the first heating bridge wire 134 can be heated by power supply of the first heating circuit 131, and the ignition powder 112 in the first powder chamber 114 in contact with the first heating bridge wire 134 can be ignited, and on this basis, the ignition powder 113 can be ignited.

[0063] On this basis, the second heating circuit 132 can be controlled to be powered on simultaneously or in stages with the first heating circuit 131, so that the second heating bridge wire 136 can be heated by power supply of the second heating circuit 132, and the ignition powder 112 in the second powder chamber 115 in contact with the second heating bridge wire 136 can be ignited, and on this basis, the ignition powder 113 can be ignited.

[0064] Therefore, by controlling the power supply of the first heating circuit 131 and the second heating circuit 132, the staged ignition can be realized, and the gas generator can realize the staged gas production.

[0065] When the first electrode 133, the second electrode 135 and the connecting electrode 137 are configured, the first electrode 133 and the second electrode 135 can be arranged around the connecting electrode 137 (as shown in Figure 4 ), or the first electrode 133, the second electrode 135 and the connecting electrode 137 can be arranged around the same axis (as shown in Figure 5The connecting electrode 137 can be arranged between the first electrode 133 and the second electrode 135, or the first electrode 133, the second electrode 135 and the connecting electrode 137 can be arranged in three sectors of the same circle.

[0066] It should be noted that in the above, when the connecting electrode 137 is a single electrode, the first heating circuit 131 and the second heating circuit 132 are in parallel with the connecting electrode 137. Unlike this, please refer to Figure 6 , and combine Figures 1-3 The connecting electrode 137 can also include a first connecting electrode 139 and a second connecting electrode 141; the first electrode 133, the first connecting electrode 139 and the first heating bridge 134 are sequentially connected; the second electrode 135, the second connecting electrode 141 and the second heating bridge 136 are sequentially connected; wherein the first heating bridge 134 is in contact with the ignition powder 112 in the first powder chamber 114, and the second heating bridge 136 is in contact with the ignition powder 112 in the second powder chamber 115. In this way, by such a setting mode, the connecting electrode 137 is divided into two independent electrodes, thereby making the first heating circuit 131 and the second heating circuit 132 two independent paths. Moreover, the first electrode 133, the second electrode 135, the first connecting electrode 139 and the second connecting electrode 141 are arranged in a manner of being spaced apart around the same axis.

[0067] Based on the above setting of the electrode tube group 130, in order to avoid short circuit of the electrode tube group 130 during use and improve the stability of use, the electrode tube group 130 further includes an insulator 138 covering at least one of the first electrode 133, the second electrode 135 and the connecting electrode 137 to separate the first electrode 133, the second electrode 135 and the connecting electrode 137, so that the first heating circuit 131 and the second heating circuit 132 can form two insulated and separated paths. Specifically, based on the above setting of the insulator 138, the embodiment adopts a manner as shown in A of Figure 4 , that is, the periphery of the first electrode 133, the second electrode 135 and the connecting electrode 137 is covered with the insulator 138.

[0068] In addition, when the connecting electrode 137 includes the first connecting electrode 139 and the second connecting electrode 141, as shown in A of Figure 6 , the periphery of the first electrode 133, the second electrode 135, the first connecting electrode 139 and the second connecting electrode 141 can also be covered with the insulator 138.

[0069] In addition, different from the arrangement of the insulator 138 described above, as shown in Figure 7 the insulator 138 can also cover the connecting electrodes 137, and a metal member 142 can be arranged outside the insulator 138. The metal member 142 can be a metal shell, or other metal perforated member or other conductive structure, which is covered outside the insulator 138. At this time, the metal member 142 can play a role of electrically connecting the first electrode 133 and the second electrode 135. Specifically, the metal member 142 is divided into two separate metal parts 143, and the two metal parts 143 correspond to the first electrode 133 and the second electrode 135 respectively. The first electrode 133 and the second electrode 135 can be welded to the corresponding metal parts 143. The first heating bridge wire 134 corresponding to the first electrode 133 can be connected to the metal part 143. In this way, one of the metal parts 143 can correspond to the electric connection between the first electrode 133 and the first heating bridge wire 134 to form the first heating circuit 131. Similarly, the other metal part 143 can correspond to the electric connection between the second electrode 135 and the second heating bridge wire 136 to form the second heating circuit 132.

[0070] When the connecting electrodes 137 include the first connecting electrode 139 and the second connecting electrode 141, as shown in Figure 8 the insulator 138 can also cover the first connecting electrode 139 and the second connecting electrode 141, and the insulator 138 covering the first connecting electrode 139 and the second connecting electrode 141 is in the form of a diagonal sector. On this basis, the metal member 142 can be arranged outside the insulator 138. The metal member 142 can be a metal shell, or other metal perforated member or other conductive structure. At this time, the metal member and the aforementioned insulator 138 form four sector structures. In this way, the metal member 142 can play a role of electrically connecting the first electrode 133 and the second electrode 135. Specifically, the metal member 142 is divided into two separate metal parts 143, and the two metal parts 143 correspond to the first electrode 133 and the second electrode 135 respectively. The first electrode 133 and the second electrode 135 can be welded to the corresponding metal parts 143. The first heating bridge wire 134 corresponding to the first electrode 133 can be connected to the metal part 143. In this way, one of the metal parts 143 can correspond to the electric connection between the first electrode 133 and the first heating bridge wire 134 to form the first heating circuit 131. Similarly, the other metal part 143 can correspond to the electric connection between the second electrode 135 and the second heating bridge wire 136 to form the second heating circuit 132.

[0071] It should be noted that the insulator 138 can be made of sintered glass or nylon insulating material. The purpose is to separate the electrodes and form the electrode tube group 130.

[0072] Further, please refer to Figures 1-3 , on the basis of the structure of the electrode tube group 130 described above, in this embodiment, it is taken as an example to explain the two-stage control, specifically, when the powder chamber group 110 is configured, the powder chamber group 110 includes a main tube body 116, the main tube body 116 is configured with a partition 117, the partition 117 divides the main tube body 116 into a first powder chamber 114 and a second powder chamber 115; wherein the electrode tube group 130 extends into the main tube body 116, and abuts with the fire powder 112 of the first powder chamber 114 and the second powder chamber 115.

[0073] Therefore, the powder chamber group 110 can adopt the mode of configuring the partition 117 in the main tube body 116, so that the tube body 120 is divided into the first powder chamber 114 and the second powder chamber 115, and the first powder chamber 114 and the second powder chamber 115 both contain the fire powder 112 and the ignition powder 113; and in order to facilitate its butt joint with the electrode tube group 130, therefore, the end of the electrode tube group 130 can extend into the main tube body 116, so that the first heating bridge wire 134 and the second heating bridge wire 136 of the electrode tube group 130 can respectively abut with the fire powder 112 of the first powder chamber 114 and the fire powder 112 of the second powder chamber 115.

[0074] In addition, the powder chamber group 110 can also adopt the mode of configuring a heat insulation member and two medicine placing tubes, the first powder chamber 114 and the second powder chamber 115 are respectively arranged in the two medicine placing tubes, and the two medicine placing tubes are separated by the heat insulation member; wherein the electrode tube group 130 extends into the two medicine placing tubes, and abuts with the fire powder 112 in the first powder chamber 114 and the second powder chamber 115.

[0075] It should be noted that the partition 117 and the heat insulation member described above can play the role of heat insulation and insulation, and the structural strength meets the use demand.

[0076] Based on the above-mentioned electric ignition tube 100, please refer to Figures 1-6 , the embodiment also provides a gas generator, the gas generator includes a main body and the above-mentioned electric ignition tube 100;

[0077] The main body is configured with at least two combustion chambers containing gas generating agent, and the two powder chambers 111 of the electric ignition tube 100 correspond to one combustion chamber respectively, and the ignition powder 113 in each powder chamber 111 is used to ignite the gas generating agent in the corresponding combustion chamber.

[0078] The gas generator is taken as an example to realize two-stage gas production, so the main body is provided with at least two combustion chambers containing gas production reagents, and two fire powder chambers 111 of the electric ignition tube 100 correspond to one combustion chamber respectively, and the ignition powder 113 in each fire powder chamber 111 is used to ignite the gas production reagent in the corresponding combustion chamber.

[0079] Further, in the process of use, through the control of the first heating circuit 131 and the second heating circuit 132 of the electric ignition tube 100, simultaneous or staged starting can be realized, and further, the staged gas production of the gas generator can be realized.

[0080] In addition, when adjusting the gas production stages, the number of combustion chambers in the main body can be adaptively adjusted on the basis of adjusting the heating circuit of the electric ignition tube 100 and the corresponding fire powder chamber 111.

[0081] In summary, the gas generator can realize the staged gas production function by using the above-mentioned electric ignition tube 100, and such a setting mode can realize simultaneous or staged control of ignition through one electric ignition tube 100, and further realize the staged gas production function of the gas generator, so as to simplify the structure for realizing the staged gas production.

[0082] Moreover, in the process of installation, compared with the prior art, the installation is more convenient, and the structure is smaller, so as to reduce the occupied internal space of the gas generator, thereby improving the space utilization rate of the gas generator and reducing the manufacturing and use cost of the gas generator.

[0083] Further, the above-mentioned gas generator can realize the intelligent function of the safety airbag, meet the requirements of the safety airbag gas generator in multiple application scenarios, and further reduce the cost of the gas generator.

[0084] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An electric ignition tube, characterized in that: The electric ignition tube includes a powder chamber group, a tube body and an electrode tube group; The gunpowder chamber group is equipped with a plurality of gunpowder chambers, and each of the gunpowder chambers contains ignition powder and ignition powder; The tube body is sleeved outside the electrode tube group and the pyrotechnic chamber group, and the electrode tube group abuts against the ignition powder; The electrode tube group is used to ignite the ignition powder in a plurality of the powder chambers simultaneously or in stages.

2. The electric ignition tube according to claim 1, characterized in that: The electrode tube group includes a first heating circuit and a second heating circuit, and the powder chamber group includes a first powder chamber and a second powder chamber; The first heating circuit is used to ignite the ignition powder in the first powder chamber, and the second heating circuit is used to ignite the ignition powder in the second powder chamber.

3. The electric ignition tube according to claim 2, characterized in that: The powder chamber group includes a main body, wherein a partition is disposed within the main body, and the partition divides the main body into the first powder chamber and the second powder chamber; The electrode tube assembly extends into the main body and abuts against the ignition powder in the first powder chamber and the second powder chamber.

4. The electric ignition tube according to claim 2, characterized in that: The powder chamber assembly includes a heat insulating member and two powder placement tubes; The two powder placing tubes are respectively provided with the first powder chamber and the second powder chamber, and the two powder placing tubes are separated by the heat insulating member; The electrode tube group extends into the two powder placement tubes and abuts against the ignition powder in the first powder chamber and the second powder chamber.

5. The electric ignition tube according to claim 2, characterized in that: The first heating circuit includes a first electrode and a first heating bridge wire, the second heating circuit includes a second electrode and a second heating bridge wire, and the electrode tube assembly further includes a connecting electrode; The first electrode, the connecting electrode and the first heating bridge wire are connected in sequence; the second electrode, the connecting electrode and the second heating bridge wire are connected in sequence; The first heating bridge wire is in contact with the ignition powder in the first powder chamber, and the second heating bridge wire is in contact with the ignition powder in the second powder chamber.

6. The electric ignition tube according to claim 5, characterized in that: The first electrode and the second electrode are arranged around the connecting electrode, or the first electrode, the second electrode and the connecting electrode are arranged at intervals around the same axis.

7. The electric ignition tube according to claim 5, characterized in that: The electrode tube assembly further includes an insulator covering at least one of the first electrode, the second electrode, and the connecting electrode to separate the first electrode, the second electrode, and the connecting electrode.

8. The electric ignition tube according to claim 5, characterized in that: The connecting electrodes include a first connecting electrode and a second connecting electrode; the first electrode, the first connecting electrode and the first heating bridge wire are connected in sequence; the second electrode, the second connecting electrode and the second heating bridge wire are connected in sequence; The first heating bridge wire is in contact with the ignition powder in the first powder chamber, and the second heating bridge wire is in contact with the ignition powder in the second powder chamber.

9. The electric ignition tube according to claim 8, characterized in that: The first electrode, the second electrode, the first connecting electrode and the second connecting electrode are spaced apart around the same axis.

10. A gas generator, characterized in that: The gas generator comprises a main body and an electric ignition tube according to any one of claims 1 to 9; The main body is provided with at least two combustion chambers for accommodating gas generating agents, and the two gunpowder chambers of the electric ignition tube correspond to one combustion chamber respectively, and the ignition powder in each gunpowder chamber is used to ignite the gas generating agent in the corresponding combustion chamber.

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