Adjustable cylindrical wire-wound resistor

Abstract

The invention relates to the technical field of resistors, in particular to an adjustable cylindrical wire-wound resistor which comprises a first disc body and a second disc body which are arranged in parallel in a spaced mode, and the opposite side portions of the first disc body and the second disc body are each provided with a plurality of supporting plates. Each supporting plate is provided with a plurality of threading rings which are arranged at intervals in the length direction of the supporting plate. The resistance wires alternately bypass the threading rings of the supporting plates of the first disc body and the second disc body, and the resistance wires are arranged in a plurality of wave shapes; and two adjacent wave crests are arranged in a staggered manner in the length direction of the supporting plate. Compared with the prior art, the two adjacent wave crests are arranged in the length direction of the supporting plate in a staggered mode, the mutual heating influence of the resistance wires is reduced through the inner and outer adjacent staggered mode, meanwhile, the inductance can be reduced, and even non-inductance can be achieved. Furthermore, by adjusting the distance between the first tray body and the second tray body, on one hand, the size is reduced, and transportation is facilitated; on the other hand, the tension degree of the resistance wire is adjusted, and the resistance wire is prevented from being shaken and pulled off in the transportation process.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, and in particular to an adjustable cylindrical wire-wound resistor. Background Art

[0002] 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 size requirements for components. As an important component in electrical equipment, the performance, size, and power of resistors have a great impact on the stability of electrical and electronic equipment.

[0003] For example, a Chinese patent document with publication number CN109065303A discloses a braided wire-wound resistor, which is designed in the field of resistor technology. Compared with the prior art, since more than two insulating separation layers are arranged in the box body, each insulating separation layer is provided with a plurality of shuttle positions, and the resistor strips are flexible, and the resistor strips are circuitously arranged in different shuttle positions, the overall structure is relatively compact, and longer resistor strips can be wound on the insulating separation layers while keeping the box body volume constant to meet the requirements of high-power use.

[0004] Another example is a Chinese patent document with publication number CN209515352U, which discloses a high-power resistor, which relates to the field of resistors. Compared with the traditional skeleton-wound resistor, the entire resistor strip is clamped on the support plate. This clamping structure reduces the occupied space and improves the overall space utilization under the same power conditions; under the same space conditions, longer resistor strips can be arranged to increase the resistor power. There is no need to coat the surface of the resistor strip with an insulating layer and bake it to fix it, so the manufacturing is faster and more time-saving, and the manufacturing cost is reduced; the middle part of the traditional skeleton-wound resistor is penetrated by a screw to shorten the creepage distance, while this resistor strip is only supported by the support frame, and no additional fastening mechanism is required to assist in fixing. The traditional screw is removed, the creepage distance is extended, and the overall insulation performance of the product is good.

[0005] The Chinese patent document with publication number CN117747230A discloses a method for manufacturing a large-diameter wire-wound resistor, including a bending step, a plate-threading step, a plate-inserting step, and a fixing step. For a large-diameter resistor bar, the resistor bar is first bent and wound in the bending step. During the bending and winding process, it is not blocked or constrained by the partition plate and can be shaped by its own strength; the resistor body after being shaped is then inserted into the partition plate for separation in the plate-threading step. In order to smoothly insert the partition plate, the partition plate in the U-shape is divided into two pieces. After the two partition plates are inserted into the U-shape laterally, they are moved longitudinally so that the partition grooves clamp the bent segments of the metal strips, thereby smoothly inserting the partition plates and positioning the bent segments of the metal strips. The positioning plates embedded in the plate-inserting step can support and position the laterally adjacent partition plates, as well as position the metal strips laterally, thereby improving the insulation safety performance.

[0006] Most existing wire-wound resistors are wound with slots on the board, and the wind resistance of the board is large, which affects the heat dissipation performance to a certain extent. In addition, the bracket of the existing wire-wound resistor is fixed, and it is difficult to adjust the tension if the resistor strip becomes loose. The volume is large during transportation and the cost is high. Summary of the invention

[0007] In view of all or part of the above-mentioned technical problems in the prior art, the present invention provides an adjustable cylindrical wirewound resistor.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] Provided is an adjustable cylindrical wirewound resistor, comprising a first disk body and a second disk body arranged in parallel and separated, wherein a first support column is arranged between the first disk body and the second disk body;

[0010] Multiple insulating support plates are arranged circumferentially on the sides of the first disk and the second disk facing each other, and each support plate is arranged radially along the first disk / the second disk; each support plate is provided with multiple threading rings arranged in a spaced relationship along its length direction;

[0011] It also includes a flexible resistance wire, which alternately passes through the threading rings of the support plates of the first disk and the second disk, so that the resistance wire is arranged in a plurality of wavy shapes, and the plurality of wavy shapes are distributed along the length direction of the support plate; the crests of two adjacent wavy shapes are staggered in the length direction of the support plate;

[0012] The first disc and / or the second disc can move along the first support under the action of external force to adjust the distance between the first disc and the second disc and the tension of the resistance line.

[0013] As a further optional scheme, it also includes a third disk body, and the first disk body, the second disk body and the third disk body are arranged in sequence, and a second pillar is provided between the second disk body and the third disk body; the support plate and the resistance wire are also provided between the second disk body and the third disk body, and their arrangement method is the same as the support plate and the resistance wire between the first disk body and the second disk body. The second pillar can move along the first pillar under the action of external force to adjust the distance between the second disk body and the third disk body and the tension of the resistance wire.

[0014] As a further optional solution, the sides of the first plate body and the third plate body facing the second plate body are respectively provided with multiple first positioning grooves for the support plate to be embedded in, and the sides of the second plate body facing the first plate body and the third plate body are respectively provided with multiple second positioning grooves for the support plate to be embedded in.

[0015] As a further optional solution, the support plate and the first positioning groove / the second positioning groove are interference fit, so that the support plate can be moved or withdrawn along its own length direction under the action of external force.

[0016] As a further optional solution, the first disk body, the second disk body and the third disk body are respectively circular disks, and the first pillar and the second pillar are cylinders located at the center of the circular disks.

[0017] As a further optional solution, the first disk body, the second disk body and the third disk body are ceramic parts.

[0018] As a further optional solution, one end of the first pillar is fixed to the first disk body, and the second disk body is provided with a clearance hole for the first pillar to pass through, and the second disk body can be moved along the first pillar to a preset position and then fixed.

[0019] As a further optional solution, a receiving hole for inserting the second pillar is opened at the center of the first pillar, and the second pillar can be inserted into the receiving hole to different degrees and fixed at a preset position.

[0020] As a further optional solution, the accommodating hole and the first pillar are interference fit, and the accommodating hole and the second pillar are interference fit, so that the second disk body and the second pillar can move only under the action of external force.

[0021] As a further optional scheme, a first guide groove arranged along the length direction of the first pillar is provided on the outer side, and the side wall of the accommodation hole is provided with a first guide protrusion embedded in the first guide groove; a second guide groove arranged along the length direction of the second pillar is provided on the outer side, and the side wall of the accommodating hole is provided with a second guide protrusion embedded in the second guide groove.

[0022] Beneficial effects of the present invention:

[0023] Compared with the prior art, the adjustable cylindrical wire-wound resistor of the present invention has a resistance wire wound in a wavy line shape between different disks, which has a good heat dissipation effect, and the wave peaks of two adjacent waves are staggered in the length direction of the support plate. The adjacent inside and outside are staggered to reduce the mutual heating influence of the resistance wires, and at the same time can reduce the inductance, or even achieve zero inductance.

[0024] Furthermore, by adjusting the distance between the first disk body and the second disk body, on the one hand, the volume can be reduced for easy transportation; on the other hand, the tension of the resistance wire can be adjusted to avoid shaking and breaking the resistance wire during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of an adjustable cylindrical wirewound resistor in an embodiment.

[0026] Figure 2 FIG. 4 is a schematic structural diagram of an adjustable cylindrical wirewound resistor from another perspective in an embodiment.

[0027] Figure 3 It is a schematic diagram of the structure of an adjustable cylindrical wirewound resistor in an embodiment after the resistance wire is hidden.

[0028] Figure 4 for Figure 3 A partial enlarged schematic diagram.

[0029] Figure 5 This is a schematic diagram of a state where the second leg of a resistor in an embodiment is inserted into the first leg.

[0030] Reference numerals:

[0031] The first disk body 1, the second disk body 2, the make way hole 21, the first guide protrusion 22, the third disk body 3, the first pillar 4, the accommodating hole 41, the first guide groove 42, the second guide protrusion 43, the second pillar 5, the second guide groove 51, the first positioning groove 6, the second positioning groove 7, the support plate 8, the threading ring 81, and the resistance wire 9. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] An adjustable cylindrical wire-wound resistor of this embodiment, such as Figures 1 to 5 As shown, it includes a first disc body 1 and a second disc body 2 which are arranged in parallel and spaced apart. A first support 4 is provided between the first disc body 1 and the second disc body 2 to limit the relative positions of the first disc body 1 and the second disc body 2.

[0034] A plurality of insulating support plates 8 are circumferentially arranged on the facing sides of the first disk body 1 and the second disk body 2, and each support plate 8 is arranged radially along the first disk body 1 / the second disk body 2; each support plate 8 is provided with a plurality of threading rings 81 spaced apart and arranged along its own length direction.

[0035] The resistor also includes a flexible resistance wire 9, which alternately passes through the threading ring 81 of the support plate 8 of the first disk body 1 and the second disk body 2, so that the resistance wire 9 is arranged in multiple wavy shapes, and the multiple waves are distributed along the length direction of the support plate 8; the peaks / troughs of two adjacent waves are staggered in the length direction of the support plate 8, and the multiple waves can be the same continuous resistance wire 9 or different resistance wires 9. The multiple wavy resistance wires 9 are arranged from the inside to the outside, and the adjacent waves inside and outside are staggered to reduce the mutual heating influence of the resistance wires 9, and at the same time can reduce the inductance, or even achieve no inductance.

[0036] Specifically, the resistor of this embodiment also includes a third disk body 3, and the first disk body 1, the second disk body 2 and the third disk body 3 are arranged in sequence, and a second support 5 is provided between the second disk body 2 and the third disk body 3, so as to limit the relative position of the second disk body 2 and the third disk body 3; the support plate 8 and the resistance wire 9 are also provided between the second disk body 2 and the third disk body 3, and the arrangement method thereof is the same as the support plate 8 and the resistance wire 9 between the first disk body 1 and the second disk body 2.

[0037] Specifically, the sides of the first plate body 1 and the third plate body 3 facing the second plate body 2 are respectively provided with a plurality of first positioning grooves 6 for the support plate 8 to be embedded in, and the sides of the second plate body 2 facing the first plate body 1 and the third plate body 3 are respectively provided with a plurality of second positioning grooves 7 for the support plate 8 to be embedded in.

[0038] Specifically, the support plate 8 and the first positioning groove 6 / the second positioning groove 7 are interference-fitted, and the support plate 8 can be moved or pulled out along its own length direction under the action of external force. The corresponding number of support plates 8 can be increased or decreased according to the resistance value and power requirements to achieve resistance value and power adjustment. The position of the support plate 8 can be moved to adjust the tension of the resistance wire 9. In practice, after the support plate 8 is threaded, the support plate 8 can be embedded in the corresponding disk body groove.

[0039] Specifically, the first disk body 1, the second disk body 2 and the third disk body 3 are respectively disks, and the first pillar 4 and the second pillar 5 are cylinders located at the center of the disks.

[0040] Specifically, the first plate body 1, the second plate body 2 and the third plate body 3 are ceramic parts.

[0041] In practice, the first support 4 and / or the second support 5 may be configured to be cylindrical, with a plurality of blowing holes on the side walls thereof. Through the connected peripheral air ducts, the blowing holes blow air from the inside to the outside to dissipate the heat of the resistance wire 9.

[0042] In practice, the resistance wire is a solid structure with sufficient strength, or a hollow tube structure, which is easy to bend and wind.

[0043] In this embodiment, the second plate 2 can move along the first support 4 under the action of external force to adjust the distance between the first plate 1 and the second plate 2 and the tension of the resistance wire 9. Similarly, the third plate 3 and the second support 5 can move along the first support 4 under the action of external force to adjust the distance between the second plate 2 and the third plate 3 and the tension of the resistance wire 9.

[0044] One end of the first support 4 is fixed to the first plate 1, and the second plate 2 is provided with a clearance hole 21 for the first support 4 to pass through, and the second plate 2 can be moved along the first support 4 to a preset position and then fixed. The center of the first support 4 is provided with a receiving hole 41 for the second support 5 to be inserted, and the second support 5 can be inserted into the receiving hole 41 to different degrees and fixed at the preset position.

[0045] Specifically, the clearance hole 21 and the first pillar 4 are in interference fit, and the receiving hole 41 and the second pillar 5 are in interference fit, so that the second plate 2 and the second pillar 5 can move only under a sufficiently large external force, and are fixed to each other without an external force. In order to enhance the friction force, a rubber spacer can be provided between the clearance hole 21 and the first pillar 4, and between the receiving hole 41 and the second pillar 5.

[0046] Specifically, a first guide groove 42 arranged along the length direction of the first pillar 4 is provided on the outer side, and a first guide protrusion 22 embedded in the first guide groove 42 is provided on the side wall of the accommodating hole 21; a second guide groove 51 arranged along the length direction of the second pillar 5 is provided on the outer side, and a second guide protrusion 43 embedded in the second guide groove 51 is provided on the side wall of the accommodating hole 41.

[0047] In the description of the present invention, it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An adjustable cylindrical wirewound resistor, characterized in that: It comprises a first plate body (1) and a second plate body (2) which are arranged in parallel and separated from each other, and a first support column (4) is arranged between the first plate body (1) and the second plate body (2); A plurality of insulating support plates (8) are arranged in a circumferentially spaced relationship on the sides of the first disk body (1) and the second disk body (2) facing each other, and each support plate (8) is arranged in a radial direction of the first disk body (1) / the second disk body (2); each support plate (8) is provided with a plurality of threading rings (81) spaced in a spaced relationship along its length direction; It also includes a flexible resistance wire (9), the resistance wire (9) alternately passing through the threading rings (81) of the support plates (8) of the first disk body (1) and the second disk body (2), so that the resistance wire (9) is arranged in a plurality of wavy shapes, and the plurality of wavy shapes are distributed along the length direction of the support plate (8); the wave crests of two adjacent wavy shapes are staggered in the length direction of the support plate (8); The first disc (1) and / or the second disc (2) can move along the first support (4) under the action of external force to adjust the distance between the first disc (1) and the second disc (2) and the tension of the resistance wire (9).

2. The adjustable cylindrical wirewound resistor according to claim 1, characterized in that: The invention also comprises a third disk body (3), wherein the first disk body (1), the second disk body (2) and the third disk body (3) are arranged in sequence and spaced apart from each other, and a second pillar (5) is arranged between the second disk body (2) and the third disk body (3); a support plate (8) and a resistance wire (9) are also arranged between the second disk body (2) and the third disk body (3), and the arrangement method thereof is the same as that of the support plate (8) and the resistance wire (9) between the first disk body (1) and the second disk body (2); the second pillar (5) can move along the first pillar (4) under the action of an external force, so as to adjust the distance between the second disk body (2) and the third disk body (3) and the tension of the resistance wire (9).

3. The adjustable cylindrical wirewound resistor according to claim 2, characterized in that: The side surfaces of the first disk body (1) and the third disk body (3) facing the second disk body (2) are respectively provided with a plurality of first positioning grooves (6) for the support plate (8) to be embedded in, and the side surfaces of the second disk body (2) facing the first disk body (1) and the third disk body (3) are respectively provided with a plurality of second positioning grooves (7) for the support plate (8) to be embedded in.

4. The adjustable cylindrical wirewound resistor according to claim 3, characterized in that: The support plate (8) and the first positioning groove (6) / the second positioning groove (7) are interference-fitted, and the support plate (8) can be moved or withdrawn along its own length direction under the action of an external force.

5. The adjustable cylindrical wirewound resistor according to claim 2, characterized in that: The first disk body (1), the second disk body (2) and the third disk body (3) are respectively disks, and the first pillar (4) and the second pillar (5) are cylinders located at the center of the disks.

6. The adjustable cylindrical wirewound resistor according to claim 2, characterized in that: The first disk body (1), the second disk body (2) and the third disk body (3) are ceramic parts.

7. The adjustable cylindrical wirewound resistor according to claim 2, characterized in that: One end of the first support (4) is fixed to the first disk body (1); the second disk body (2) is provided with a clearance hole for the first support (4) to pass through; the second disk body (2) can be moved along the first support (4) to a preset position and then fixed.

8. The adjustable cylindrical wirewound resistor according to claim 7, characterized in that: A receiving hole for inserting the second support (5) is provided at the center of the first support (4); the second support (5) can be inserted into the receiving hole to different degrees and fixed at a preset position.

9. The adjustable cylindrical wirewound resistor according to claim 8, characterized in that: The giving hole and the first pillar (4) are in interference fit, and the receiving hole and the second pillar (5) are in interference fit, so that the second disk body (2) and the second pillar (5) can only move under the action of external force.

10. The adjustable cylindrical wirewound resistor according to claim 8, characterized in that: The first pillar (4) is provided with a first guide groove arranged along its length direction on its outer side, and the side wall of the accommodating hole is provided with a first guide protrusion embedded in the first guide groove; the second pillar (5) is provided with a second guide groove arranged along its length direction on its outer side, and the side wall of the accommodating hole is provided with a second guide protrusion embedded in the second guide groove.

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