Explosion-proof structure of low-power wire-wound fusing resistor

Abstract

The utility model relates to the technical field of explosion prevention of resistors, in particular to an explosion-proof structure of a low-power wire-wound fusing resistor. The device comprises an explosion-proof layer, the explosion-proof layer is hollow and is provided with a fusing layer, the fusing layer is made of gypsum powder, the inner wall of the fusing layer is provided with a pre-splitting groove, the pre-splitting groove is communicated with a spiral groove located between the thickness of the inner wall and the thickness of the outer wall of the fusing layer, and the port of the spiral groove is provided with a preformed hole. The presplitting groove is formed in the fusing layer and used for discharging high-temperature gas generated in the fusing layer to the vacuum layer along the spiral groove, a magnetic rod is fixedly installed in the fusing layer, a copper lead is wound on the outer side of the magnetic rod, and after the copper lead in the resistor is fused, a large amount of generated high-temperature gas can break through the presplitting groove and then is guided into the vacuum layer through the spiral groove to be discharged. The advancing path and the gas storage space of the high-temperature gas are increased, the high-temperature gas is prevented from forming too high pressure and temperature in a local area in the resistor, the gas storage space of the high-temperature gas is larger due to the arrangement of the vacuum layer, and the risk of resistor explosion is avoided.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof resistor technology, specifically to an explosion-proof structure for a low-power wire-wound fusible resistor. Background Technology

[0002] In the design of electronic products' operating circuits, fusible resistors are typically used to ensure the safety of the electronic products. This prevents the electronic products from continuing to operate for extended periods due to factors that cause the operating current to exceed the rated value, which could lead to overheating and heat accumulation that could cause a fire. Therefore, fusible resistors play a decisive role in ensuring the safety performance of electronic products.

[0003] In the existing explosion-proof structure of low-power wire-wound fusible resistors, the explosion-proof level of the entire fusible resistor is usually improved by changing the materials used in the manufacturing process. However, in some extreme cases, the current may be instantly overloaded, and a large amount of high-temperature gas will be generated after the resistor wire melts. If there is no space to store the generated high-temperature gas and it cannot be treated and discharged in time, a high-voltage phenomenon will be generated in the resistor cavity for a short time, which may cause the fusible resistor to explode and damage the surrounding components. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof structure for a low-power wire-wound fusible resistor, so as to solve the problem in the prior art that the high-temperature gas generated after the resistor melts cannot be better handled.

[0005] To achieve the above objectives, an explosion-proof structure for a low-power wire-wound fusible resistor is provided, comprising an explosion-proof layer, wherein the explosion-proof layer is hollow and has a fusible layer, the fusible layer being made of gypsum powder, a pre-cracked groove being formed on the inner wall of the fusible layer, and the pre-cracked groove being connected to a spiral groove located between the inner and outer wall thicknesses of the fusible layer, a reserved hole being formed at the port of the spiral groove for discharging high-temperature gas generated inside the fusible layer to a vacuum layer along the spiral groove, and a magnetic rod being fixedly installed inside the fusible layer, with copper leads wound around the outside of the magnetic rod.

[0006] As a further improvement to this technical solution, the explosion-proof layer includes a metal layer with a thickness between 0.1 mm and 0.2 mm. An arc-extinguishing layer is disposed inside the metal layer. The arc-extinguishing layer is made of aluminum oxide and is used to absorb additional heat and prevent secondary short circuits. The thickness of the arc-extinguishing layer is between 0.1 mm and 0.2 mm.

[0007] As a further improvement to this technical solution, the inner wall of the arc-extinguishing layer is coated with an insulating coating.

[0008] As a further improvement to this technical solution, a vacuum layer is formed between the fusing layer and the arc-extinguishing layer, and the middle part of the fusing layer is fixed to the arc-extinguishing layer by a flange.

[0009] As a further improvement to this technical solution, a magnetic rod is provided inside the fusion layer, and a copper lead is wound around the outer wall of the magnetic rod. The two ends of the copper lead pass through the fusion layer, the insulating coating, the arc-extinguishing layer and the metal layer in sequence and are connected to the outside.

[0010] As a further improvement to this technical solution, the explosion-proof layer is provided with multiple pressure relief holes on both sides near the copper leads. These pressure relief holes are used to smoothly discharge the high-temperature gas generated after the internal melting.

[0011] As a further improvement to this technical solution, the fusion layer is continuously arranged along the axial and circumferential directions of the resistor body. When the copper lead melts inside the fusion layer, the generated high-temperature gas preferentially breaks through the pre-cracked groove provided on the inner wall of the fusion layer and flows out to the vacuum layer at both ends of the spiral groove. In the vacuum layer, a gas cloud is formed, which breaks through the insulating coating applied to the side of the pressure relief hole and is discharged to the outside of the fusion resistor body.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The explosion-proof structure of this low-power wire-wound fusible resistor utilizes a pre-cracked groove on the inner wall of the fusible layer and a spiral groove connecting the pre-cracked groove. This allows a large amount of high-temperature gas generated after the copper leads inside the resistor melt to break through the pre-cracked groove and then be guided into the vacuum layer through the spiral groove for discharge. This increases the travel path and storage space of the high-temperature gas, preventing excessively high pressure and temperature from forming in localized areas inside the resistor. Furthermore, the vacuum layer provides a larger storage space for the high-temperature gas, resulting in lower internal pressure and eliminating the risk of resistor explosion. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the transverse cross-section structure of this utility model;

[0017] The meanings of the labels in the diagram are as follows:

[0018] 100. Explosion-proof layer; 101. Metal layer; 102. Arc-extinguishing layer; 103. Insulating coating; 104. Fusible layer; 105. Flange; 106. Vacuum layer; 107. Pre-cracked groove; 108. Spiral groove; 109. Reserved hole; 110. Magnetic rod; 111. Copper lead wire; 112. Pressure relief hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Please refer to Figures 1-3 As shown, the purpose of this embodiment is to provide an explosion-proof structure for a low-power wire-wound fusible resistor, including an explosion-proof layer 100. The explosion-proof layer 100 is hollow and has a fusible layer 104. The fusible layer 104 is made of gypsum powder. A pre-cracked groove 107 is formed on the inner wall of the fusible layer 104, and the pre-cracked groove 107 is connected to a spiral groove 108 located between the inner and outer wall thicknesses of the fusible layer 104. A reserved hole 109 is formed at the end of the spiral groove 108 for venting the high-temperature gas generated inside the fusible layer 104. The gas is discharged into the vacuum layer 106 along the spiral groove 108. A magnetic rod 110 is fixedly installed inside the fuse layer 104, and a copper lead wire 111 is wound around the outside of the magnetic rod 110. Through the pre-crack groove 107 provided on the inner wall of the fuse layer 104 and the spiral groove 108 that connects to the pre-crack groove 107, a large amount of high-temperature gas generated after the copper lead wire 111 inside the resistor is melted will break through the pre-crack groove 107 and then be introduced into the vacuum layer 106 for discharge through the spiral groove 108, thereby increasing the travel path and storage space of the high-temperature gas.

[0021] Furthermore, to make the explosion-proof structure of the fusible resistor more reliable, the explosion-proof layer 100 includes a metal layer 101 with a thickness between 0.1 mm and 0.2 mm. An arc-extinguishing layer 102 is disposed inside the metal layer 101. The arc-extinguishing layer 102 is made of aluminum oxide and is used to absorb additional heat and prevent secondary short circuits. The thickness of the arc-extinguishing layer 102 is between 0.1 mm and 0.2 mm, and an insulating coating 103 is coated on the inner wall of the arc-extinguishing layer 102. After the internal resistor melts, the arc-extinguishing layer 102 and the insulating coating 103 can absorb the additional heat of the high-temperature gas and prevent the generation of an electric arc, thus avoiding the risk of secondary short circuits.

[0022] Furthermore, in order to enable the explosion-proof structure of the fusible resistor to melt quickly under current overload, a vacuum layer 106 is provided between the fusible layer 104 and the arc-extinguishing layer 102, and the middle part of the fusible layer 104 is fixed to the arc-extinguishing layer 102 by a flange 105. A magnetic rod 110 is provided inside the fusible layer 104, and a copper lead wire 111 is wound around the outer wall of the magnetic rod 110. The two ends of the copper lead wire 111 pass through the fusible layer 104, the insulating coating 103, the arc-extinguishing layer 102 and the metal layer 101 in sequence and are connected to the outside. When subjected to voltage or current surges exceeding the standard, the fusible layer 104 made of gypsum powder can concentrate the large amount of heat generated by the copper lead wire 111 and prevent the heat from spreading out of the fusible layer 104. Therefore, the copper lead wire 111 can melt quickly under high heat environment, avoiding the explosion caused by excessively slow melting speed leading to overload of internal high-temperature gas and energy.

[0023] Furthermore, in order to ensure that the explosion-proof structure of the low-power wire-wound fusible resistor can smoothly discharge high-temperature gas after the resistor melts, the explosion-proof layer 100 has multiple pressure relief holes 112 on both sides near the copper lead 111. The pressure relief holes 112 are used to smoothly discharge the high-temperature gas generated after the internal melting. After the high-temperature gas is introduced into the vacuum layer 106, when it accumulates to a certain pressure, the gas will break through the insulating coating 103 on the surface of the pressure relief hole 112 and be discharged to the outside of the resistor.

[0024] The working principle of this device is as follows: Under normal operating conditions, current is transmitted through the copper lead 111 (spirally wound on the magnetic rod 110). In extreme cases, such as current overload or short circuit, the copper lead 111 rapidly heats up to its melting point due to resistance heating and melts. The gypsum powder fusing layer 104 can concentrate the large amount of heat generated by the copper lead 111, preventing heat from dissipating outwards. Therefore, the copper lead 111 can melt quickly under high-temperature conditions, avoiding excessively slow melting speed that could lead to overload of internal high-temperature gas and energy, resulting in an explosion. Furthermore, the gas generated after melting creates pressure, preferentially breaking through the pre-cracked groove 1 on the inner wall of the fusing layer 104. 07. The gas will flow along the spiral groove 108 connecting the pre-cracked groove 107, and then be discharged to the vacuum layer 106 through the reserved holes 109 at both ends. The sufficient gas storage space of the vacuum layer 106 will instantly reduce the gas pressure inside the resistor cavity, and the discharged high-temperature gas will be cooled in the vacuum layer 106. After the internal resistor melts, the arc-extinguishing layer 102 and the insulating coating 103 can absorb the extra heat of the high-temperature gas and prevent the generation of electric arc, avoiding the risk of secondary short circuit. When the high-temperature gas accumulates enough pressure in the vacuum layer 106 on both sides of the flange 105, it will break through the insulating coating 103 attached to the surface of the pressure relief hole 112 and be discharged to the outside of the cavity.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof structure of a low-power wire-wound fuse resistor comprising an explosion-proof layer (100), characterized in that: The explosion-proof layer (100) is hollow inside and has a fusion layer (104). The fusion layer (104) is made of gypsum powder. The inner wall of the fusion layer (104) has a pre-crack groove (107) and the pre-crack groove (107) is connected to a spiral groove (108) located between the inner and outer wall thicknesses of the fusion layer (104). A reserved hole (109) is provided at the port of the spiral groove (108) for discharging the high-temperature gas generated inside the fusion layer (104) to the vacuum layer (106) along the spiral groove (108). A magnetic rod (110) is fixedly installed inside the fusion layer (104) and a copper lead wire (111) is wound around the outside of the magnetic rod (110).

2. The explosion-proof structure of a low-power line wound fuse resistor according to claim 1, characterized in that: The explosion-proof layer (100) includes a metal layer (101) with a thickness between 0.1 mm and 0.2 mm. An arc-extinguishing layer (102) is disposed inside the metal layer (101). The arc-extinguishing layer (102) is made of aluminum oxide and is used to absorb additional heat and prevent secondary short circuits. The thickness of the arc-extinguishing layer (102) is between 0.1 mm and 0.2 mm.

3. The explosion-proof structure of a low-power line wound fuse resistor according to claim 2, characterized in that: The inner wall of the arc-extinguishing layer (102) is coated with an insulating coating (103).

4. The explosion-proof structure of a low-power line wound fuse resistor according to claim 1, characterized by: A vacuum layer (106) is provided between the fusible layer (104) and the arc-extinguishing layer (102), and the middle part of the fusible layer (104) is fixed to the arc-extinguishing layer (102) by a flange (105).

5. The explosion-proof structure of a low-power line wound fuse resistor according to claim 1, characterized by: The fuse layer (104) is provided with a magnetic rod (110) inside. The outer wall of the magnetic rod (110) is wrapped with a copper lead wire (111). The two ends of the copper lead wire (111) pass through the fuse layer (104), the insulating coating (103), the arc extinguishing layer (102) and the metal layer (101) in sequence and are connected to the outside.

6. The explosion-proof structure of a low-power line wound fuse resistor according to claim 1, characterized by: The explosion-proof layer (100) has multiple pressure relief holes (112) on both sides near the copper lead wire (111). The pressure relief holes (112) are used to smoothly discharge the high-temperature gas generated after the internal melting.

7. The explosion-proof structure of a low-power line wound fuse resistor according to claim 6, characterized by: The fusion layer (104) is continuously arranged along the axial and circumferential directions of the fusion resistor. When the copper lead (111) melts inside the fusion layer (104), the generated high-temperature gas preferentially breaks through the pre-cracked groove (107) provided on the inner wall of the fusion layer (104) and flows out to the two ends of the spiral groove (108) into the vacuum layer (106). A gas cloud is formed in the vacuum layer (106), breaks through the insulating coating (103) coated on one side of the pressure relief hole (112), and is discharged outside the fusion resistor.

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