Igniter with enhanced antistatic ESD performance and assembly process thereof

Abstract

The igniter comprises an electrode plug and a medicine cup, a first single electrode and a second single electrode which do not make contact with each other are fixed to the electrode plug, one end of the first single electrode is fixedly connected with one side of the electrode plug, and the other end of the first single electrode is fixedly connected with the other side of the electrode plug. One end of the second single electrode penetrates from one side of the electrode plug to the other corresponding side of the electrode plug and is electrically isolated from the electrode plug, the other corresponding side of the electrode plug is provided with a bridge wire, one end of the bridge wire is fixedly connected with the surface of the electrode plug, the other end of the bridge wire is fixedly connected with the end of the second single electrode, and the electrode plug is located in the medicine cup and fixedly connected with the medicine cup. A liquid initiating explosive is filled between the other side corresponding to the electrode plug and the bottom of the explosive cup, and the other end of the first single electrode and the other end of the second single electrode penetrate through the open end of the explosive cup and then are located outside the explosive cup in a suspended mode. The beneficial effects are that the effective length of the bridge wire is prevented from being reduced, and the resistance attenuation of the bridge wire is not caused.

Description

Technical Field

[0001] The invention relates to the technical field related to ignition tools, and in particular to an ignition tool with enhanced anti-static ESD performance and an assembly process thereof. Background Art

[0002] As a passive safety protection system, airbags work together with seat belts to form a car safety system, which can provide limited anti-collision protection for drivers and passengers, and reduce the injury rate of passengers when a car accident occurs. The igniter is a very important component of the airbag.

[0003] The Chinese patent number is CN102092356A, and the authorization announcement date is June 15, 2011. It discloses an electric ignition device for automobile safety airbags, which includes: an annular electrode; insulating glass, arranged between the annular electrodes; a single electrode, divided into a first single electrode and a second single electrode, one end of the first single electrode is connected to the annular electrode; the second single electrode is inserted into the insulating glass; a bridge wire, through which the annular electrode and the second single electrode are connected together; a tube shell, connected to the annular electrode, the tube shell and the annular electrode and the insulating glass form a space; ignition powder, arranged in the space; a plastic sleeve, arranged on the outside of the tube shell; a plastic injection molded body, arranged on the outside of the plastic sleeve and the annular electrode; it is characterized in that a medicine tube is provided in the space, and the medicine tube is connected to the side of the annular electrode away from the axis.

[0004] It can be known from the above patents that in the prior art, after the general electric ignition tools are subjected to electrostatic discharge and ESD tests, the bridge wire and the metal electrode plug (i.e., the annular electrode in the above cited patent) are micro-welded, and the bridge wire length carried on the glass electrode (i.e., the second single electrode in the above cited patent) is short, and the bridge wire resistance is greatly attenuated (attenuation rate>20%), and the bridge wire resistance is even lower than 1.7 ohms. The bridge wire resistance is a key factor in ensuring the normal detonation of the ignition tool. According to Q=I²Rt, Q is the minimum heat required for the ignition tool explosive to detonate; I-detonation current, generally 1.2A constant current; R-bridge wire resistance; t-time required for the ignition tool to detonate. When the bridge wire resistance decays, the time required for the ignition tool to detonate will increase, resulting in the ignition tool not being able to detonate in time within the specified time, resulting in failure. Usually in the industry, the ignition powder is dried and then pressed directly onto the bridge wire. The bridge wire is flattened and contacts the metal surface of the electrode plug. When the ESD is energized, the bridge wire becomes soft and the contact with the metal surface of the electrode plug is enhanced. At the same time, after the bridge wire is energized, a resistance welding loop is formed between the bridge wire and the electrode plug. Micro-welding causes the bridge wire and the metal surface of the electrode plug to be combined into one, and the effective length of the bridge wire is reduced, resulting in resistance attenuation. Summary of the invention

[0005] The present invention aims to overcome the drawback of bridge wire resistance attenuation in the prior art and provides an ignition tool with enhanced anti-static ESD performance which will not cause bridge wire resistance attenuation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An ignition device with enhanced anti-static ESD performance comprises an electrode plug and a medicine cup, wherein a single electrode 1 and a single electrode 2 which do not contact each other are fixed on the electrode plug respectively, one end of the single electrode 1 is fixedly connected to one side of the electrode plug, one end of the single electrode 2 passes through from one side of the electrode plug to the other side corresponding to the electrode plug and is electrically isolated from the electrode plug, a bridge wire is provided on the other side corresponding to the electrode plug, one end of the bridge wire is fixedly connected to the surface of the electrode plug, and the other end of the bridge wire is fixedly connected to the end of the single electrode 2, the electrode plug is located in the medicine cup and fixedly connected to the medicine cup, liquid detonating powder is filled between the other side corresponding to the electrode plug and the bottom of the medicine cup, and the other end of the single electrode 1 and the other end of the single electrode 2 both pass through the open end of the medicine cup and are suspended outside the medicine cup.

[0007] The electrode plug is respectively fixed with a single electrode 1 and a single electrode 2 that do not touch each other, one end of the single electrode 1 is fixedly connected to one side of the electrode plug, one end of the single electrode 2 passes through from one side of the electrode plug to the other side corresponding to the electrode plug and is electrically isolated from the electrode plug, a bridge wire is provided on the other side corresponding to the electrode plug, one end of the bridge wire is fixedly connected to the surface of the electrode plug, the other end of the bridge wire is fixedly connected to the end of the single electrode 2, the electrode plug is located in the medicine cup and is fixedly connected to the medicine cup, and the other side corresponding to the electrode plug and the bottom of the medicine cup are filled with liquid detonating powder, and the other end of the single electrode 1 and the other end of the single electrode 2 both pass through the open end of the medicine cup and are suspended outside the medicine cup. The dry ignition powder is replaced with liquid detonating powder to avoid the bridge wire from being flattened and contacting the metal surface of the electrode plug, thereby avoiding the reduction of the effective length of the bridge wire, achieving the purpose of not causing the bridge wire resistance to decay, which is conducive to the ignition device being able to detonate in time within the specified time.

[0008] Preferably, one end of the single electrode 2 is sleeved with insulating glass, and the single electrode 2 passes through the insulating glass from one side of the electrode plug to the other side corresponding to the electrode plug, and the single electrode 2 is fixedly connected to the electrode plug through the insulating glass. The single electrode 2 and the electrode plug are connected together through a bridge wire, so that an electric bridge is formed between the single electrode 1 and the single electrode 2, which plays a role in converting electrical energy into thermal energy and detonating liquid explosive in the electric ignition tool.

[0009] Preferably, a groove is provided on one side of the electrode plug, and a through hole matching the insulating glass is provided at the bottom of the groove. The single electrode 2 is inserted into the through hole through the insulating glass and fixedly connected to the electrode plug, and the aperture of the through hole is smaller than the minimum inner diameter of the groove. The design of the groove facilitates the assembly and fixation of the single electrode 2 on the one hand, and avoids direct contact between the single electrode 2 and the electrode plug on the other hand, which is conducive to the single electrode 1 to form an electric bridge with the single electrode 2 through the electrode plug and the bridge wire in sequence.

[0010] Preferably, the single electrode 2 is sealed and connected to the electrode plug through insulating glass, which is beneficial to generate high pressure in the medicine cup after the liquid explosive is detonated.

[0011] Preferably, the end surface of the two sets of single electrodes provided with insulating glass and the other side surface corresponding to the electrode plug are located on the same plane, which is convenient for welding the bridge wire and helps save materials.

[0012] Preferably, the electrode plug is sealed and connected to the medicine cup, and a sealed cavity is formed between the electrode plug and the bottom of the medicine cup, and the liquid explosive is located in the sealed cavity, which seals the liquid explosive and facilitates the generation of high pressure in the medicine cup after the liquid explosive is detonated.

[0013] Preferably, a weak groove is provided at the bottom of the medicine cup, and the weak groove is located outside the medicine cup. The weak groove guides the heat conduction direction when the liquid explosive explodes.

[0014] The present invention also provides an assembly process of an ignition tool with enhanced anti-static ESD performance, which comprises the following steps: Step S1, dip a small amount of organic solution onto the surface of the bridge wire and the electrode plug to remove the surface tension of the electrode plug and the bridge wire; Step S2, dripping a small amount of liquid detonator around the bridge wire; since the electrode plug and the bridge wire remove the surface tension, the liquid detonator will flow to the bottom of the bridge wire, filling the gap between the bridge wire and the electrode plug, avoiding direct contact between the bridge wire and the electrode plug, thereby avoiding a reduction in the effective length of the bridge wire, achieving the purpose of not causing the bridge wire resistance to decay, and facilitating the ignition device to be able to detonate in time within the specified time; Step S3, the remaining liquid explosive is assembled in the medicine cup; Step S4, assembling the powder cup equipped with the remaining liquid detonator and the electrode plug together.

[0015] Preferably, in step S2, the amount of liquid explosive dripped around the bridge wire is 5 mg.

[0016] The beneficial effects of the present invention are: avoiding the contact between the bridge wire and the metal surface of the electrode plug after being flattened, thereby avoiding the reduction of the effective length of the bridge wire, achieving the purpose of not causing the bridge wire resistance to decay, and facilitating the ignition device to be ignited in time within the specified time; the design of the groove is convenient for the assembly and fixation of the single electrode two on the one hand, and on the other hand, avoiding the direct contact between the single electrode two and the electrode plug, which is conducive to the single electrode one and the single electrode two forming an electric bridge through the electrode plug and the bridge wire in sequence; it is convenient for the welding of the bridge wire and is also conducive to saving materials; it has a sealing effect on the liquid explosive, which is conducive to the generation of high pressure in the medicine cup after the liquid explosive is detonated; the weak groove has the effect of guiding the heat conduction direction of the liquid explosive when it explodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is an assembly process flow chart of the present invention.

[0018] In the figure: 1. electrode plug, 2. medicine cup, 3. single electrode one, 4. single electrode two, 5. bridge wire, 6. liquid detonator, 7. insulating glass, 8. groove, 9. through hole, 10. weak groove. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement of the parts, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0023] like Figure 1 In the described embodiment, an ignition device with enhanced anti-static ESD performance includes an electrode plug 1 and a medicine cup 2, wherein a single electrode 1 3 and a single electrode 2 4 that do not contact each other are fixed on the electrode plug 1, respectively, one end of the single electrode 1 3 is fixedly connected to one side of the electrode plug 1, one end of the single electrode 2 4 passes through from one side of the electrode plug 1 to the other side corresponding to the electrode plug 1 and is electrically isolated from the electrode plug 1, a bridge wire 5 is provided on the other side corresponding to the electrode plug 1, one end of the bridge wire 5 is fixedly connected to the surface of the electrode plug 1, and the other end of the bridge wire 5 is fixedly connected to the end of the single electrode 2 4, the electrode plug 1 is located in the medicine cup 2 and fixedly connected to the medicine cup 2, a liquid detonating agent 6 is filled between the other side corresponding to the electrode plug 1 and the bottom of the medicine cup 2, and the other end of the single electrode 1 3 and the other end of the single electrode 2 4 both pass through the open end of the medicine cup 2 and are suspended outside the medicine cup 2.

[0024] One end of the single electrode 2 4 is sleeved with an insulating glass 7 , and the single electrode 2 4 passes through the insulating glass 7 from one side of the electrode plug 1 to the other side corresponding to the electrode plug 1 , and the single electrode 2 4 is fixedly connected to the electrode plug 1 through the insulating glass 7 .

[0025] A groove 8 is provided on one side of the electrode plug 1, and a through hole 9 matching the insulating glass 7 is provided at the bottom of the groove 8. The single electrode 2 4 is inserted into the through hole 9 through the insulating glass 7 and fixedly connected to the electrode plug 1. The aperture of the through hole 9 is smaller than the minimum inner diameter of the groove 8. The single electrode 2 4 is sealed and connected to the electrode plug 1 through the insulating glass 7.

[0026] The end surface of the single electrode 24 with the insulating glass 7 and the other side surface corresponding to the electrode plug 1 are located on the same plane.

[0027] The electrode plug 1 is sealed and connected to the medicine cup 2, and a sealed cavity is formed between the electrode plug 1 and the bottom of the medicine cup 2, and the liquid detonator 6 is located in the sealed cavity. A weak groove 10 is provided at the bottom of the medicine cup 2, and the weak groove 10 is located outside the medicine cup 2.

[0028] like Figure 2 In the embodiment described, the present invention also provides an assembly process of an ignition tool with enhanced anti-static ESD performance, comprising the following steps: Step S1, dip a small amount of organic solution onto the surface of the bridge wire 5 and the electrode plug 1 to remove the surface tension of the electrode plug 1 and the bridge wire 5; Step S2, drip a small amount of liquid detonator 6 around the bridge wire 5. Since the electrode plug 1 and the bridge wire 5 remove the surface tension, the liquid detonator 6 will flow to the bottom of the bridge wire 5 and fill the gap between the bridge wire 5 and the electrode plug 2, so as to avoid the bridge wire 5 being flattened and directly contacting the electrode plug 1, thereby avoiding the reduction of the effective length of the bridge wire, achieving the purpose of not causing the bridge wire resistance to decay, and facilitating the ignition device to be detonated in time within the specified time; Step S3, the remaining liquid explosive 6 is assembled in the medicine cup 2; Step S4 , assembling the medicine cup 2 equipped with the remaining liquid detonator 6 and the electrode plug 1 together.

[0029] In step S2, the amount of liquid explosive 6 dripped around the bridge wire 5 is 5 mg.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ignition tool with enhanced anti-static ESD performance, characterized in that: The invention comprises an electrode plug (1) and a medicine cup (2), wherein a single electrode 1 (3) and a single electrode 2 (4) which are not in contact with each other are fixed on the electrode plug (1), one end of the single electrode 1 (3) is fixedly connected to one side of the electrode plug (1), one end of the single electrode 2 (4) passes through from one side of the electrode plug (1) to the other side corresponding to the electrode plug (1) and is electrically isolated from the electrode plug (1), a bridge wire (5) is provided on the other side corresponding to the electrode plug (1), one end of the bridge wire (5) is fixedly connected to the surface of the electrode plug (1), and the other end of the bridge wire (5) is fixedly connected to the end of the single electrode 2 (4), the electrode plug (1) is located in the medicine cup (2) and is fixedly connected to the medicine cup (2), a liquid detonating charge (6) is filled between the other side corresponding to the electrode plug (1) and the bottom of the medicine cup (2), and the other ends of the single electrode 1 (3) and the single electrode 2 (4) both pass through the opening end of the medicine cup (2) and are suspended outside the medicine cup (2).

2. The ignition tool with enhanced anti-static ESD performance according to claim 1, characterized in that: One end of the single electrode 2 (4) is sleeved with an insulating glass (7), and the single electrode 2 (4) passes through the insulating glass (7) from one side of the electrode plug (1) to the other side corresponding to the electrode plug (1), and the single electrode 2 (4) is fixedly connected to the electrode plug (1) through the insulating glass (7).

3. The ignition tool with enhanced anti-static ESD performance according to claim 2, characterized in that: A groove (8) is provided on one side of the electrode plug (1), and a through hole (9) matching the insulating glass (7) is provided at the bottom of the groove (8); the single electrode 2 (4) is inserted into the through hole (9) through the insulating glass (7) and fixedly connected to the electrode plug (1); the aperture of the through hole (9) is smaller than the minimum inner diameter of the groove (8).

4. The ignition tool with enhanced anti-static ESD performance according to claim 3, characterized in that: The single electrode 2 (4) is sealed and connected to the electrode plug (1) via insulating glass (7).

5. The ignition tool with enhanced anti-static ESD performance according to claim 2, characterized in that: The end surface of one end of the second (4) single electrode sleeve provided with insulating glass (7) and the other side surface corresponding to the electrode plug (1) are located on the same plane.

6. An ignition tool with enhanced anti-static ESD performance according to claim 1, 2, 3, 4 or 5, characterized in that: The electrode plug (1) is sealedly connected to the medicine cup (2); a sealed cavity is formed between the electrode plug (1) and the bottom of the medicine cup (2); and the liquid detonating charge (6) is located in the sealed cavity.

7. An ignition tool with enhanced anti-static ESD performance according to claim 1, 2, 3, 4 or 5, characterized in that: The bottom of the medicine cup (2) is provided with a weakened groove (10), and the weakened groove (10) is located outside the medicine cup (2).

8. The assembly process of an ignition tool with enhanced anti-static ESD performance according to claim 1, 2, 3, 4 or 5, characterized in that: The following steps are involved: Step S1, dipping a small amount of organic solution onto the surface of the bridge wire (5) and the electrode plug (1); Step S2, dripping a small amount of liquid explosive (6) around the bridge wire (5); Step S3, the remaining liquid explosive (6) is assembled in the explosive cup (2); Step S4, assembling the medicine cup (2) equipped with the remaining liquid detonator (6) and the electrode plug (1) together.

9. The ignition tool with enhanced anti-static ESD performance according to claim 8, characterized in that: In step S2, the amount of liquid explosive (6) dripped around the bridge wire (5) is 5 mg.

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