A wire-wound resistor to prevent wire breakage

Abstract

The present invention discloses a wire-wound resistor that prevents the wire from being decoupled, comprising a housing and a plurality of resistor modules that are connected in series and in parallel with each other and are arranged in the housing. Each resistor module comprises a resistor bar, a bracket and a plurality of insulating support rods, the plurality of support rods are fixed to the bracket in parallel, each support rod is provided with a plurality of side grooves, the plurality of side grooves are arranged along the length direction of the support rod, the resistor bar passes through the different side grooves of different horizontal support rods in a circuitous manner in sequence, the side of the support rod is provided with a limiting groove, the resistor bar bypasses the limiting groove, and the groove wall of the limiting groove limits the resistor bar in the opposite direction of the resistor bar being separated from the side groove. Therefore, during the manufacturing process, the limiting groove can prevent the resistor bar from being separated from the side groove, reducing the difficulty of assembly. When in use, the resistor bar can be prevented from being separated from the side groove due to vibration, ensuring that different sections of the resistor bar will not contact each other and short-circuit, thereby improving the stability performance.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, and in particular to a wire-wound resistor that prevents wires from falling off. Background Art

[0002] When the outdoor high-voltage power switch shunts current to the zero-voltage submodule capacitor, the power switch needs to be equipped with a starting resistor to prevent the starting current from being too large, causing the switch power supply to burn out the fuse or trip. High-power resistors are widely used in energy consumption control systems powered by variable-frequency motors, starting, speed regulation, and braking control systems for industrial motors, as well as simulated loads of various industrial electrical appliances and neutral point grounding resistors in distribution systems. The existing high-power resistors mainly include wire-wound resistors, thick-film resistors, and chip resistors. At present, it is difficult for high-power resistors to be both small in size and large enough in power requirements. With the development of science and technology, the higher the integration of power electronic equipment, the higher the requirements for the size of components. As an important component in electrical equipment, the performance, size, and power of resistors have a great influence on the stability of electrical and electronic equipment. To this end, the inventor invented a wire-wound resistor with patent numbers ZL201821584019.5 and ZL201821583986.X, which specifically discloses that the resistor bar passes through different side grooves of different cross support rods in a circuitous manner in sequence. The overall structure is relatively compact. When the volume of the box is constant, a longer resistor bar can be wound on the cross support rod to meet the needs of high-power use.

[0003] However, the resistor strip of the wire wound resistor is easy to fall out of the side groove during installation, which increases the difficulty of assembly. During use, the resistor strip is easy to fall out of the side groove due to vibration, resulting in short circuit between different sections of the resistor strip and damage to the entire resistor, and the stability is low. Summary of the invention

[0004] In view of the above technical problems in the prior art, the present invention provides a wire-wound resistor which reduces the difficulty of assembly and improves the stability of use and prevents wire debonding.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Provided is a wire-wound resistor with anti-offline properties, comprising a box body and a plurality of resistor modules arranged in the box body and connected in series and parallel with each other, each resistor module comprising a resistor bar, a bracket and a plurality of insulating support rods, the plurality of support rods are fixed to the bracket in parallel, each support rod is provided with a plurality of side grooves, the plurality of side grooves are arranged along the length direction of the support rod, the resistor bar passes through different side grooves of different transverse support rods in a circuitous manner in sequence, a limiting groove is provided on the side of the support rod, the resistor bar bypasses the limiting groove, and the resistor bar is limited by the groove wall of the limiting groove in the opposite direction of the resistor bar leaving the side groove.

[0007] Specifically, the support rod is a mica rod, and the mica rod is formed by pressing multiple layers of mica paper.

[0008] Specifically, the limiting groove is coated with an insulating adhesive layer.

[0009] Specifically, the bracket is frame-shaped, and is provided with slots, and both ends of the support rod are respectively embedded and clamped in different slots.

[0010] Specifically, the support rod and the slot are interference fit.

[0011] Specifically, a fan blowing outward is arranged in the box body, and a mesh plate is arranged on the side wall of the box body. The mesh plate includes an inner plate and an outer plate stacked on each other, the inner plate has a plurality of inner air outlets, and the outer plate has a plurality of outer air outlets, and the inner air outlets are partially aligned with the outer air outlets.

[0012] Beneficial effects of the present invention:

[0013] Compared with the prior art, the anti-decoupling wire wound resistor of the present invention has a limiting groove on the side of the support rod, the resistor bar bypasses the limiting groove, and the groove wall of the limiting groove limits the resistor bar in the opposite direction of the resistor bar being separated from the side groove. Therefore, during the manufacturing process, the limiting groove can prevent the resistor bar from being separated from the side groove, reducing the difficulty of assembly. When in use, it can prevent the resistor bar from being separated from the side groove due to vibration, ensuring that different sections of the resistor bar will not contact each other and short-circuit, thereby improving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the anti-wire-off wirewound resistor in the embodiment.

[0015] Figure 2 It is a schematic structural diagram of the anti-wire-off winding resistor in the embodiment with a partial box body hidden.

[0016] Figure 3 It is a schematic structural diagram of the combination of a bracket and a support rod of a wire-wound resistor for preventing wire derailment in an embodiment.

[0017] Figure 4 for Figure 3 Magnified view at A in the middle.

[0018] Figure 5 Schematic diagram of the structure of the bracket in the embodiment.

[0019] Figure 6 Schematic diagram of the structure of the mesh plate in the embodiment.

[0020] Reference numerals:

[0021] Box 1;

[0022] Resistor module 2;

[0023] Bracket 3, slot 31;

[0024] Support rod 4, side groove 41, limiting groove 42;

[0025] Fan 5, mesh plate 6, inner plate 61, outer plate 62. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0027] The anti-offline wire wound resistor of this embodiment is as follows Figures 1 to 4 As shown, it includes a box body 1 and a plurality of resistor modules 2 connected in series and parallel to each other in the box body 1. Each resistor module 2 includes a resistor bar, a bracket 3 and a plurality of insulating support rods 4. The plurality of support rods 4 are fixed in parallel to the bracket 3. Each support rod 4 has a plurality of side grooves 41, which are arranged along the length direction of the support rod 4. The resistor bar passes through different side grooves 41 of different horizontal support rods 4 in a circuitous manner. The outer sides of the two outermost support rods 4 have limit grooves 42. Figure 4 It can be seen that the cross section between two adjacent side grooves 41 of the support rod 4 is T-shaped. Therefore, when assembling the resistor bar, the resistor bar bypasses the limiting groove 42, so that the resistor bar is limited by the groove wall of the limiting groove 42 in the opposite direction of the resistor bar detaching from the side groove 41. Therefore, during the manufacturing process, the limiting groove 42 can prevent the resistor bar from detaching from the side groove 41, reducing the difficulty of assembly. When in use, it can prevent the resistor bar from detaching from the side groove 41 due to vibration, ensuring that different sections of the resistor bar will not contact each other and short-circuit, thereby improving stability.

[0028] In this embodiment, the support rod 4 is a mica rod made of multiple layers of mica paper, and mica has a better insulation effect. However, the mica rod with the limiting groove 42 is prone to loosening the multiple layers of mica paper, so an insulating adhesive layer is further coated on the limiting groove 42 to ensure that the mica paper will not loosen after the limiting groove 42 is opened on the mica rod.

[0029] In this embodiment, combined with Figure 5 As shown, the bracket 3 is frame-shaped and is provided with a clamping slot 31. The two ends of the support rod 4 are respectively embedded and clamped in different clamping slots 31. The support rod 4 and the clamping slot 31 are interference-fitted to facilitate assembly.

[0030] In this embodiment, a fan 5 for blowing air outward is arranged in the box body 1, and mesh panels 6 are arranged on the left and right side walls of the box body 1 respectively. Figure 6As shown, the mesh plate 6 includes an inner plate 61 and an outer plate 62 which are stacked on each other. The inner plate 61 has a plurality of inner air outlets, and the outer plate 62 has a plurality of outer air outlets. The inner air outlets are partially aligned with the outer air outlets. On the one hand, this avoids opening too dense holes in the same plate to reduce the strength of the plate, and on the other hand, it can increase the density of the inlet and outlet.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A wire-wound resistor for preventing wires from being decoupled, comprising a housing and a plurality of resistor modules connected in series and in parallel in the housing, each resistor module comprising a resistor bar, a bracket and a plurality of insulating support rods, the plurality of support rods being fixed to the bracket in parallel, each support rod having a plurality of side grooves, the plurality of side grooves being arranged along the length direction of the support rod, the resistor bar passing through different side grooves of different horizontal support rods in a circuitous manner in sequence, and characterized in that: The side of the support rod is provided with a limiting groove, the resistor bar bypasses the limiting groove, and the resistor bar is limited at the groove wall of the limiting groove in the opposite direction of the resistor bar leaving the side groove; The support rod is a mica rod, and the mica rod is pressed by multiple layers of mica paper; The limiting groove is coated with an insulating adhesive layer; A fan for blowing air outward is arranged in the box body, and a mesh plate is arranged on the side wall of the box body. The mesh plate includes an inner plate and an outer plate stacked on each other, the inner plate has a plurality of inner air outlets, and the outer plate has a plurality of outer air outlets, and the inner air outlets are partially aligned with the outer air outlets.

2. The anti-de-wired wire-wound resistor according to claim 1, characterized in that: The bracket is frame-shaped and is provided with slots, and the two ends of the support rod are respectively embedded and clamped in different slots.

3. The anti-de-wired wire-wound resistor according to claim 2, characterized in that: The support rod and the clamping slot are interference fit.

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