Heating resistor and portable electric igniter for fireworks

Abstract

The utility model discloses a heating resistor and a portable electric igniter for fireworks, and the heating resistor comprises a substrate part and at least two resistance wires, the substrate part is provided with a substrate body, a connecting circuit pattern arranged on the front surface of the substrate body, a bonding pad arranged on the back surface of the substrate body and a connecting copper body which is arranged on the substrate body and penetrates through the front surface and the back surface of the substrate body, and the connecting copper body is communicated with the bonding pad; the at least two resistance wires are arranged on the front surface of the substrate body and are electrically connected with the connecting circuit pattern to form a heating branch, and the heating branch is communicated with the connecting copper body; and functional layers are arranged at the connection position of the resistance wire and the connection circuit pattern and the connection position of the heating branch and the connection copper body. The heating resistor is simple, reasonable and novel in structure, good in heat gathering effect and high in heating temperature, still has excellent conduction performance and working precision at high temperature, can well improve the ignition effect of the igniter, and meets the market requirement of the igniter.

Description

Technical Field

[0001] The utility model relates to the technical field of heating resistors, in particular to a heating resistor and a portable electric igniter for fireworks made by using the same. Background Art

[0002] As is well known, the igniters of fireworks and other pyrotechnic products used in the market at present need to dip ignition powder. Since the igniter carries gunpowder, on the one hand, there are safety hazards in the production, transportation, storage, anti-static, installation and use and other links of the igniter, which seriously restricts the development of pyrotechnic products; on the other hand, due to the difficulty in accurately controlling the dipping amount of gunpowder for the igniter in the industry, the use performance of the igniter varies, affecting the use and firing effect of the terminal.

[0003] In order to overcome the above problems, the industry has begun to develop gunpowder-free igniters. Among them, using a heating resistor to ignite the ignition lead is the key research and development direction in the industry at present. However, due to the limitation of the existing heating resistor structure, the heating effect, conduction performance and working accuracy at high temperature of the current heating resistor cannot well meet the ignition effect requirements of the igniter. In view of this, the present utility model is specifically proposed. Summary of the Invention

[0004] In order to overcome the above defects, the utility model provides a heating resistor and a portable electric igniter for fireworks. The structure of the heating resistor is simple, reasonable and novel, with good heat aggregation effect and high heating temperature, and still has excellent conduction performance and working accuracy at high temperature, which can well improve the ignition effect of the igniter and meet the market demand of the igniter.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a heating resistor, comprising:

[0006] A substrate part, which is provided with a substrate body, a connection circuit pattern arranged on the front surface of the substrate body, a solder pad arranged on the back surface of the substrate body, and a connection copper body arranged on the substrate body and respectively penetrating through the front and back surfaces of the substrate body, and the connection copper body is communicated with the solder pad;

[0007] Resistance wires, which are configured to be at least two; at least two of the resistance wires are all arranged on the front surface of the substrate body, and are simultaneously electrically connected with the connection circuit pattern according to the electrical design requirements of the product to form a heating branch together, and the heating branch is also communicated with the connection copper body;

[0008] In addition, a functional layer is arranged at the position where the resistance wire is connected to the connection circuit pattern and at the position where the heating branch is connected to the connection copper body.

[0009] As a further improvement of the present invention, the front side of the substrate body is a plane, and at least two resistance wires are spaced apart and arranged side by side on the front side of the substrate body.

[0010] As a further improvement of the present invention, the connection circuit pattern is provided with at least one, and at least one connection circuit pattern and at least two resistance wires are alternately connected end to end in sequence to form the heating branch; and the head and tail ends of the heating branch are respectively connected to the connecting copper body.

[0011] As a further improvement of the present utility model, the number of the connection circuit patterns is greater than or less than the number of the resistance wires;

[0012] When the number of the connection line patterns is greater than the number of the resistance wires, two of the connection line patterns are used as the first and last ends of the heating branch and are respectively connected to the connection copper body;

[0013] When the number of the connection line patterns is less than the number of the resistance wires, two of the resistance wires are used as the first and last ends of the heating branch and are respectively connected to the connection copper body.

[0014] As a further improvement of the present invention, the connection circuit pattern is fixedly connected with the corresponding resistance wire by welding;

[0015] The connecting copper body and its corresponding connecting circuit pattern or the resistance wire are also welded and fixedly connected.

[0016] As a further improvement of the present invention, the soldering pad and the connecting copper body are respectively configured as two, so as to correspond one to one with the first and last ends of the heating branch.

[0017] As a further improvement of the utility model, the functional layer is composed of a nickel-plated layer and a copper-plated layer coated outside the nickel-plated layer;

[0018] The resistance wire is made of tungsten alloy material, and the diameter of the resistance wire is 5-100 μm.

[0019] The utility model also provides a portable electric ignition device for fireworks, comprising a tightening sleeve, a plug for inserting an ignition fuse, and a heating resistor as described in the utility model, wherein the heating resistor is built into the tightening sleeve, and the plug is inserted into the tightening sleeve together with the ignition fuse until the ignition fuse abuts against the heating branch of the heating resistor. At the same time, the tightening sleeve can also squeeze and tighten the part of the plug inserted therein so that the plug clamps the ignition fuse.

[0020] As a further improvement of the utility model, the tightening sleeve is provided with a sleeve body in the shape of a hollow sleeve, the inner diameter of the sleeve body gradually decreases from one axial end to the other axial end, and the other axial end of the sleeve body also extends radially inward to form a retaining ring capable of stopping and limiting the heating resistor; in addition, a plurality of extrusion strips extending along the axial direction and arranged at intervals along the circumferential direction are convexly provided on the inner wall of the sleeve body;

[0021] The plug is provided with a hollow sleeve-shaped head and a plurality of clamping strips arranged in a ring on an axial end of the head, the plurality of clamping strips can be inserted into the sleeve body, the plurality of extrusion strips correspond to the plurality of clamping strips one by one, and can be extruded to bring the plurality of clamping strips closer to each other to clamp the ignition fuse.

[0022] As a further improvement of the present invention, an axial end of the sleeve body is formed with an inclined surface A extending obliquely relative to its axial direction;

[0023] An inclined surface B is formed on the inner wall of an axial end of the head facing away from the clamping strip, and teeth are formed on the inner wall of each of the clamping strips;

[0024] In addition, the electric ignition device is also provided with a connecting wire, one end of which is fixedly connected to the welding pad of the heating resistor by welding, and the other end of the connecting wire extends out of the tightening sleeve for electrical connection with an external power source.

[0025] The beneficial effects of the utility model are as follows: ① Through structural innovation, the utility model successfully develops a heating resistor with good heat gathering effect, high heating temperature (up to 3000℃), excellent conduction performance and working accuracy at high temperature; the heating resistor can make the ignition tool achieve an ignition effect with a response time of microseconds and an ignition success rate of 100%, which well meets the market demand for fire products such as fireworks and fireworks, and has a good market application prospect. ② The structure of the heating resistor described in the utility model is simple, reasonable and novel, easy to carry out batch production, and the product consistency, stability and reliability of the produced heating resistor are high. ③ Using the heating resistor described in the utility model to ignite the ignition fuse can effectively avoid the safety hazards of traditional ignition tools with gunpowder in the production, transportation, storage and other links, thereby promoting the development of fire products / pyrotechnics. ④ The heating resistor described in the utility model can be widely used in various types of ignition tools, fire products / pyrotechnics, with good applicability and strong versatility. ⑤ The structure of the electric ignition tool described in the utility model is simple, reasonable, easy to process and assemble, and the product reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the three-dimensional structural schematic diagrams of the heating resistor described in Example 1 of the utility model;

[0027] Figure 2For Figure 1 Schematic diagram of the structure of the heating resistor shown from the first perspective;

[0028] Figure 3 For Figure 1 Schematic diagram of the structure of the heating resistor shown from the second perspective;

[0029] Figure 4 Second partial three-dimensional structure diagram of the heating resistor according to Embodiment 1 of the present utility model;

[0030] Figure 5 Partial three-dimensional structure diagram of the heating resistor according to Embodiment 2 of the present utility model;

[0031] Figure 6 Schematic diagram of the structure of the portable electric igniter for fireworks according to Embodiment 3 of the present utility model;

[0032] Figure 7 For Figure 6 Partial half-sectional structure diagram of the portable electric igniter for fireworks shown;

[0033] Figure 8 For Figure 7 Enlarged structure diagram of part A shown in

[0034] Figure 9 For Figure 6 Schematic diagram of the structure of the tightening sleeve in the portable electric igniter for fireworks shown;

[0035] Figure 10 For Figure 6 Schematic diagram of the structure of the plug in the portable electric igniter for fireworks shown.

[0036] The following description is made in conjunction with the accompanying drawings:

[0037] 1. Substrate part; 10. Substrate body; 11. Connection circuit pattern; 12. Pad; 13. Connection copper body; 2. Resistance wire; 3. Heating resistor; 4. Plug; 40. Head; 400. Inclined surface B; 41. Clip; 410. Teeth; 5. Tightening sleeve; 50. Sleeve main body; 51. Retaining ring; 52. Extrusion strip; 53. Inclined surface A; 6. Connecting wire. Specific embodiments

[0038] The following describes in detail the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0039] Embodiment 1:

[0040] Embodiment 1 provides a heating resistor that can be applied to an igniter. When connected to an external power supply, the heating resistor can instantaneously generate high-temperature heat and can quickly and fully transfer the heat to the ignition lead in the igniter, so that the igniter achieves an ignition effect with a response time in the microsecond level and an ignition success rate of 100%.

[0041] Please refer to the appendix Figure 1 to the appendix Figure 4 As shown, the heating resistor described in Embodiment 1 mainly includes a substrate part 1 and a resistance wire 2. Among them, the substrate part 1 is provided with a substrate body 10, a connection circuit pattern 11 arranged on the front surface of the substrate body 10, two pads 12 spaced apart on the back surface of the substrate body 10, and two connection copper bodies 13 spaced apart on the substrate body 10 and respectively penetrating through the front and back surfaces of the substrate body 10. The two pads 12 are used to connect to an external power supply, and the two connection copper bodies 13 are respectively connected to the two pads 12; the resistance wire 2 is configured to be at least two and is made of a conductive heating material. At least two resistance wires 2 are all arranged on the front surface of the substrate body 10, and at least two resistance wires 2 are also electrically connected to the connection circuit pattern 11 according to the electrical design requirements of the product to form a heating branch together. The head and tail ends of the heating branch are respectively connected to the two connection copper bodies 13, that is: the heating branch can be connected to the pad 12 through the connection copper body 13 and further connected to the external power supply; it can be understood that by concentrating the resistance wire 2 on the front surface of the substrate body 10, it can be realized that the heating resistor can instantaneously gather high-temperature heat (by configuring a set number of the resistance wires 2 according to the product design requirements, it can be realized that the heat of up to 3000 °C can be instantaneously gathered). In addition, functional layers are provided at the positions where the resistance wire 2 is connected to the connection circuit pattern 11 and at the positions where the heating branch is connected to the connection copper body 13. By means of the functional layer, the bonding strength between the resistance wire 2 and the connection circuit pattern 11 and the conduction performance at high temperature and so on can be effectively improved.

[0042] As can be seen from the above, through structural innovation, the present utility model has successfully developed a heating resistor with good heat aggregation effect, high heating temperature (up to 3000 °C), and excellent conduction performance and working accuracy at high temperature; through this heating resistor, the igniter can achieve an ignition effect with a response time in the microsecond level and an ignition success rate of 100%, which well meets the market demand of the igniter and has good market application prospects.

[0043] The following will detail the specific structure and manufacturing method of the heating resistor described in Embodiment 1.

[0044] First, regarding the specific structure of the heating resistor.

[0045] Please continue to refer to the attached Figure 1 to the attached Figure 4 As shown, in the substrate part 1 of the first embodiment, the substrate body 10 preferably adopts a flat plate structure, that is: both the front and back surfaces of the substrate body 10 arranged back to back are planes; at least two of the resistance wires 2 are respectively arranged at intervals and side by side on the front surface of the substrate body 10. It can be understood that by concentrating the resistance wires 2 on the same plane, the heat focusing effect of the heating resistor can be further improved, thereby further enhancing the heating / ignition effect of the heating resistor.

[0046] Furthermore, in the first embodiment, according to the product design requirements, the number of the resistance wires 2 is one more than the number of the connection circuit patterns 11 (that is, the connection circuit patterns 11 are configured to be at least one). Thereby, the resistance wires 2 and the connection circuit patterns 11 can be alternately arranged in sequence and connected end to end to form the heating branch. It can be understood that the heating branch belongs to a series circuit. At that time, the two resistance wires 2 located on the outermost sides in the heating branch are the head and tail ends of the heating branch, and are respectively connected to the two connection copper bodies 13, so that the heating branch is connected to the external power supply through the connection copper bodies 13 and the pads 12. It can be understood that the heating branch belongs to the core part of the circuit structure of the heating resistor, and it can instantaneously generate high-temperature heat when connected to the external power supply.

[0047] For example: Please continue to refer to the attached Figure 1 and the attached Figure 4 As shown, in the first embodiment, the resistance wires 2 are configured to be two and arranged side by side, the connection circuit pattern 11 is configured to be one and placed between the two resistance wires 2, and the two ends of the connection circuit pattern 11 are respectively connected to the tail end of the first resistance wire 2 and the head end of the second resistance wire 2, that is: the two resistance wires 2 and one connection circuit pattern 11 are connected in series to form the heating branch together. Correspondingly, the two resistance wires 2 are also respectively connected to the two connection copper bodies 13.

[0048] Even further, in the first embodiment, the resistance wire 2 is preferably made of a tungsten alloy material, and the diameter of the resistance wire 2 is preferably designed to be 5 - 100 μm according to product requirements. It can be understood that the tungsten alloy material has high tensile strength, resistivity and resistance strain sensitivity coefficient, and has a low resistance temperature coefficient and excellent oxidation resistance; thus, the tungsten alloy material can be well used to make the heating resistor.

[0049] Furthermore, in this Embodiment 1, according to factors such as the area size of the front surface of the substrate body 10, the configured number and layout mode of the resistance wires 2, etc., the shape of the connection line pattern 11 can preferably adopt shapes such as Z-shaped or wavy. For example: Attached Figure 1 and attached Figure 4 show the situation where the connection line pattern 11 is approximately Z-shaped, but it can be understood that in actual production, the shape of the connection line pattern 11 is not limited to the above two, and is specifically determined according to the product design requirements.

[0050] Furthermore, in this Embodiment 1, the resistance wire 2 is fixedly connected to the connection line pattern 11 and the resistance wire 2 is fixedly connected to the connection copper body 13 by a welding method (such as a brazing method). It can be understood that: ① When the resistance wire 2 is configured as two, the two resistance wires 2 are respectively fixedly connected to their corresponding connection line patterns 11 and connection copper bodies 13 by welding; ② When the resistance wire 2 is configured as three or more, the two outermost resistance wires 2 are respectively fixedly connected to their corresponding connection line patterns 11 and connection copper bodies 13 by welding, and the middle resistance wires 2 are respectively fixedly connected to their corresponding connection line patterns 11.

[0051] In addition, in this Embodiment 1, based on the effects that the functional layer must achieve, the functional layer preferably adopts at least one of a nickel plating layer and a copper plating layer. And further, the functional layer is composed of the nickel plating layer and the copper plating layer coated outside the nickel plating layer, that is: first, the nickel plating layer is plated at the positions where the resistance wire 2 is connected to the connection line pattern 11 and at the positions where the resistance wire 2 is connected to the connection copper body 13, and then the copper plating layer is plated on the nickel plating layer; wherein, the nickel plating layer serves as the "bottom layer" of the functional layer, which can well improve the bonding property between the copper plating layer and the resistance wire 2, the connection line pattern 11, and the connection copper body 13, and can improve the mechanical strength of the copper plating layer; the copper plating layer can improve the conduction performance between the resistance wire 2 and the connection line pattern 11 and between the resistance wire 2 and the connection copper body 13 during high-temperature operation, thereby ensuring the reliability and accuracy of the heating resistor during high-temperature operation.

[0052] Supplementary description: Attached Figure 1 and attached Figure 4 The main difference points of the heating resistor structures shown are: the layout / arrangement positions of the connection line pattern 11 and the connection copper body 13 are slightly different. In addition, attached Figure 1 and attached Figure 4For the specific structures / materials / quantities of the components in the shown heating resistor, as well as the connection relationships between the components, etc., the same technical means can be adopted. In short, according to the customer's customized requirements and the limitations of actual production conditions, when manufacturing the heating resistor, fine-tuning will be carried out on the specific sizes of the components therein and the relative position layouts / arrangements between the components, which is also within the protection scope of this application.

[0053] Next, regarding the manufacturing method of the heating resistor.

[0054] Based on the above structural description of the heating resistor, the manufacturing method of the heating resistor is as follows:

[0055] S1: Provide the substrate body 10, which is made of an insulating material, such as PP fiberglass cloth can be preferably used.

[0056] S2: Stack and place prepregs and copper foil layers on the front and back sides of the substrate body 10 in sequence, and then perform hot pressing operation to obtain an intermediate board;

[0057] Perform drilling, electroplating, pre-treatment before film lamination, coating with an anti-etching photosensitive film, exposure, development, etching, and film stripping processing procedures on the intermediate board in sequence to fabricate the connection circuit pattern 11, the pads 12, and the connection copper body 13 on the substrate body 10, that is, obtain the substrate part 1.

[0058] Explanation: The above "drilling, electroplating, pre-treatment before film lamination, coating with an anti-etching photosensitive film, exposure, development, etching, and film stripping processing procedures" all belong to common technical means in the field of printed circuit board processing. Therefore, they will not be described in detail here, but only briefly explained:

[0059] ① Drilling: Use a laser drilling machine or a mechanical drilling machine to drill the intermediate board to obtain a through hole.

[0060] ② Electroplating: Use the hole filling electroplating process to electroplate the connection copper body 13 in the obtained through hole; through the connection copper body 13, the two copper foil layers can be connected.

[0061] ③ Pre-treatment before film lamination, coating with an anti-etching photosensitive film: The pre-treatment before film lamination is to clean and heat-dry the intermediate board after electroplating to facilitate the subsequent process operations; coating with an anti-etching photosensitive film is to attach an anti-etching photosensitive dry film to the copper foil layer.

[0062] ④ Exposure, development: Exposure is to expose some areas of the anti-etching photosensitive dry film; development is to remove the unexposed areas of the anti-etching photosensitive dry film.

[0063] ⑤ Etching: It is to remove the local area of the copper foil layer exposed outside the anti-etching photosensitive dry film to obtain the connection circuit pattern 11 and the pad 12; wherein, the pad 12 is communicated with the connecting copper body 13.

[0064] ⑥ Film stripping: It is to remove the anti-etching photosensitive dry film with a strong alkaline solution.

[0065] S3: Provide at least two of the resistance wires 2; then fix and connect the resistance wires 2 to the connection circuit pattern 11 and the resistance wires 2 to the connecting copper body 13 according to the electrical design requirements of the product and by welding.

[0066] S4: Electroplate the functional layer at the positions where the resistance wires 2 are connected to the connection circuit pattern 11 and at the positions where the resistance wires 2 are connected to the connecting copper body 13, that is, the heating resistor is obtained.

[0067] Embodiment 2:

[0068] This Embodiment 2 also provides a heating resistor. Compared with Embodiment 1, the difference of the heating resistor in this Embodiment 2 is that: the configuration quantity layout of the connection circuit pattern 11 and the resistance wires 2 in the heating resistor of this Embodiment 2 is different from that of Embodiment 1.

[0069] Specifically, please refer to the appendix Figure 5 As shown, in this Embodiment 2, the number of the connection circuit patterns 11 is greater than the number of the resistance wires 2. For example, four connection circuit patterns 11 are configured and three resistance wires 2 are configured; when the connection circuit patterns 11 and the resistance wires 2 are alternately arranged in sequence and connected end to end to form the heating branch, the two connection circuit patterns 11 located on the outermost sides in the heating branch are the head and tail ends of the heating branch and are respectively communicated with the connecting copper body 13, so that the heating branch is communicated with the external power supply through the connecting copper body 13 and the pad 12.

[0070] In addition, regarding the shape and arrangement position of the connection circuit pattern 11, no restrictive requirements are made in this Embodiment 2, as long as the multiple parallel resistance wires 2 can be connected in series.

[0071] In addition, except for the above differences, the structure of the substrate body 10 in the heating resistor of this Embodiment 2, the configured quantity of the pad 12 and the connecting copper body 13, the material of the resistance wire 2, the connection manner among the connection circuit pattern 11, the connecting copper body 13, and the resistance wire 2, the functional layer structure, etc. can all adopt the same technical solutions as those in Embodiment 1, so no detailed description is given here.

[0072] Embodiment 3:

[0073] Please refer to the attached Figure 6 to the attached Figure 10 As shown, Embodiment 3 provides a portable electric igniter for fireworks, which includes a tightening sleeve 5, a plug 4 for inserting an ignition lead (the ignition lead is used to connect with the lead of the fireworks), and a heating resistor 3. Among them, the heating resistor 3 can adopt the heating resistor structure provided in Embodiment 1 or Embodiment 2. The Figure 8 The heating resistor 3 shown in the attachment adopts the first heating resistor structure provided in Embodiment 1 (see the attached Figure 1 and 2 shown), but this application is not limited thereto; the heating resistor 3 is built into the tightening sleeve 5, and the plug 4 together with the ignition lead is inserted into the tightening sleeve 5 until the ignition lead abuts against the heating branch of the heating resistor 3. At the same time, the tightening sleeve 5 can also squeeze and tighten a part of the plug 4 inserted therein, so that the plug 4 clamps the ignition lead, that is, the ignition lead stably abuts against the heating branch of the heating resistor 3. It can be understood that based on the advantages of the heating resistor 3 of this application, the electric igniter can achieve an ignition effect with a response time in the microsecond level and an ignition success rate of 100%, which well meets the market demand for igniters such as fireworks and has good market application prospects.

[0074] The specific structure of the electric igniter will be described in detail below.

[0075] In Embodiment 3, the specific structure for realizing that the heating resistor 3 is built into the tightening sleeve 5 and the tightening sleeve 5 can squeeze and tighten a part of the plug 4 inserted therein so that the plug 4 clamps the ignition lead is: Please continue to refer to the attached Figure 6 to the attached Figure 10As shown, the tightening sleeve 5 is provided with a sleeve body 50 in the shape of a hollow sleeve, the inner diameter of the sleeve body 50 gradually decreases from one axial end to the other axial end, and the other axial end of the sleeve body 50 (i.e., the axial end with a smaller inner diameter) also extends radially inward to form a retaining ring 51 capable of stopping and limiting the heating resistor 3. It can be understood that the heating resistor 3 is built into the sleeve body 50, and the retaining ring 51 stops the heating resistor 3 to prevent the heating resistor 3 from escaping from the sleeve body 50; in addition, the sleeve body 5 0 is also provided with a plurality of extrusion strips 52 extending along its axial direction and arranged at intervals along its circumferential direction on its inner wall; the plug 4 is provided with a head 40 in the shape of a hollow sleeve and a plurality of clamping strips 41 arranged in a ring on one axial end of the head 40, the plurality of clamping strips 41 can be inserted into the sleeve body 50 along the axial direction of the sleeve body 50, and during the insertion process of the plurality of clamping strips 41, the plurality of extrusion strips 52 correspond to the plurality of clamping strips 41 one by one, and can squeeze the plurality of clamping strips 41 to bring them closer to each other to clamp the ignition fuse.

[0076] Preferably, an inclined surface A53 extending obliquely relative to the axial direction of the sleeve body 50 is formed on one axial end of the sleeve body 50. Preferably, the inclined surface A53 is annular (see the attached Figure 9 As shown), that is, the inclined surface A53 is equivalent to the bell mouth of the tightening sleeve 5 as a whole, which can facilitate the insertion of the plug 4 into the sleeve body 50.

[0077] Further preferably, an inclined surface B400 is formed on the inner wall of the axial end of the head 40 facing away from the clamping strip 41 (see the attached Figure 10 As shown in FIG. 4 , similar to the bevel A53 , the configuration of the bevel B400 is also conducive to inserting the ignition lead into the plug 4 .

[0078] Further preferably, each of the inner walls of the clamping strips 41 is formed with teeth 410 (see the attached Figure 8 As shown), the teeth 410 can ensure that the clamping strip 41 firmly clamps the ignition fuse.

[0079] Further preferably, the electric ignition device is further provided with a connecting wire 6, one end of which is welded and fixedly connected to the welding pad 12 of the heating resistor 3, and the other end of which extends out of the tightening sleeve 5 for electrical connection with an external power source; Figure 7 and attached Figure 8 shown.

[0080] In summary, the heating resistor provided by the present utility model has the characteristics of good heat aggregation effect, high heating temperature, excellent conduction performance and working accuracy at high temperatures, etc., which can well improve the ignition effect of the igniter and meet the market demand of the igniter. In addition, the structure of the heating resistor of the present utility model is simple, reasonable and novel, easy to be mass-produced, and the product consistency, stability and reliability of the produced heating resistor are high.

[0081] Finally, the suffixes "A", "B", etc. (such as inclined plane A, inclined plane B, etc.) of the component names in the patent specification of the present utility model are only for the convenience of clear description, rather than to limit the scope of implementation of the patent of the present utility model.

[0082] In the above description, many specific details are elaborated to fully understand the present utility model. However, the above description is only the preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. All those that do not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A heating resistor, characterized in that: include: A substrate part (1) is provided with a substrate body (10), a connection circuit pattern (11) provided on the front side of the substrate body (10), a soldering pad (12) provided on the back side of the substrate body (10), and a connecting copper body (13) provided on the substrate body (10) and respectively penetrating the front and back sides of the substrate body (10), wherein the connecting copper body (13) is connected to the soldering pad (12); The resistance wires (2) are provided in at least two pieces; at least two of the resistance wires (2) are arranged on the front side of the substrate body (10), and are electrically connected to the connection circuit pattern (11) according to the product electrical design requirements, and together form a heating branch, and the heating branch is also connected to the connection copper body (13); In addition, a functional layer is provided at the position where the resistance wire (2) is connected to the connection line pattern (11), and at the position where the heating branch is connected to the connection copper body (13).

2. The heating resistor according to claim 1, characterized in that: The front side of the substrate body (10) is a plane, and at least two resistance wires (2) are arranged at intervals and side by side on the front side of the substrate body (10).

3. The heating resistor according to claim 2, characterized in that: The connecting line pattern (11) is provided as at least one, and the at least one connecting line pattern (11) and at least two of the resistance wires (2) are alternately connected end to end in sequence to form the heating branch; and the head and tail ends of the heating branch are respectively connected to the connecting copper body (13).

4. The heating resistor according to claim 3, characterized in that: The number of the connection line patterns (11) is greater than or less than the number of the resistance wires (2); When the number of the connection line patterns (11) is greater than the number of the resistance wires (2), two of the connection line patterns (11) are used as the first and last ends of the heating branch and are respectively connected to the connection copper body (13); When the number of the connection line patterns (11) is less than the number of the resistance wires (2), two of the resistance wires (2) are used as the first and last ends of the heating branch and are respectively connected to the connection copper body (13).

5. The heating resistor according to claim 3, characterized in that: The connection circuit pattern (11) is fixedly connected to the corresponding resistance wire (2) by welding; The connecting copper body (13) and the corresponding connecting circuit pattern (11) or the resistance wire (2) are also welded and fixedly connected.

6. The heating resistor according to claim 3, characterized in that: The soldering pad (12) and the connecting copper body (13) are respectively configured in two pieces so as to correspond one to one with the first and last ends of the heating branch.

7. The heating resistor according to claim 1, characterized in that: The functional layer consists of a nickel-plated layer and a copper-plated layer coated outside the nickel-plated layer; The resistance wire (2) is made of tungsten alloy material, and the diameter of the resistance wire (2) is 5 to 100 μm.

8. A portable electric ignition device for fireworks, characterized in that: It comprises a tightening sleeve (5), a plug (4) for inserting an ignition fuse, and a heating resistor (3) as described in any one of claims 1 to 7, wherein the heating resistor (3) is built into the tightening sleeve (5), and the plug (4) is inserted into the tightening sleeve (5) together with the ignition fuse until the ignition fuse abuts against the heating branch of the heating resistor (3); at the same time, the tightening sleeve (5) can also squeeze and tighten the part of the plug (4) inserted therein, so that the plug (4) clamps the ignition fuse.

9. The portable electric ignition device for fireworks according to claim 8, characterized in that: The tightening sleeve (5) is provided with a sleeve body (50) in the shape of a hollow sleeve, the inner diameter of the sleeve body (50) gradually decreases from one axial end to the other axial end, and the other axial end of the sleeve body (50) also extends radially inward to form a retaining ring (51) capable of stopping and limiting the heating resistor (3); in addition, a plurality of extrusion strips (52) extending along the axial direction and arranged at intervals along the circumferential direction are also protruded from the inner wall of the sleeve body (50); The plug (4) is provided with a head (40) in the shape of a hollow sleeve and a plurality of clamping strips (41) arranged in a ring on an axial end of the head (40); the plurality of clamping strips (41) can be inserted into the sleeve body (50); the plurality of extrusion strips (52) correspond to the plurality of clamping strips (41) one by one and can be extruded to bring the plurality of clamping strips (41) closer to each other so as to clamp the ignition fuse.

10. The portable electric ignition device for fireworks according to claim 9, characterized in that: An axial end of the sleeve body (50) is formed with an inclined surface A (53) extending obliquely relative to the axial direction thereof; An inclined surface B (400) is formed on the inner wall of an axial end of the head (40) facing away from the clamping strip (41), and teeth (410) are formed on the inner wall of each clamping strip (41); In addition, the electric ignition device is also provided with a connecting wire (6), one end of which is welded and fixedly connected to the welding pad (12) of the heating resistor (3), and the other end of which extends out of the tightening sleeve (5) for electrical connection with an external power source.

Images