An adjustable cylindrical wirewound resistor

Abstract

The present application relates to the technical field of resistance, in particular to an adjustable cylindrical winding resistor, comprising a first disc body and a second disc body arranged in parallel and separated, the opposite sides of the first disc body and the second disc body are respectively provided with a plurality of support plates, each support plate is provided with a plurality of threading rings arranged in parallel along the length direction of the support plate, the resistance wire is alternately wound around the threading rings of the support plates of the first disc body and the second disc body, and the resistance wire is arranged in a plurality of wave shapes, the peaks of two adjacent wave shapes are arranged in a staggered manner in the length direction of the support plate. Compared with the prior art, the peaks of two adjacent wave shapes are arranged in a staggered manner in the length direction of the support plate, the staggered manner of the adjacent inside and outside is realized to reduce the mutual heating influence of the resistance wire, and the inductance can be reduced, and even the inductance can be eliminated. Furthermore, the distance between the first disc body and the second disc body can be adjusted, on the one hand, the volume is reduced, and the transportation is facilitated, and on the other hand, the tension of the resistance wire is adjusted to avoid the resistance wire from being shaken and broken in the transportation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resistance, in particular to an adjustable cylindrical wire-wound resistor. BACKGROUND

[0002] High-power resistors are widely used in energy consumption control systems powered by variable frequency motors, starting, speed regulation, and braking control systems of industrial motors, and neutral point grounding resistors in analog load and power distribution systems of various industrial electrical appliances. Among existing high-power resistors, there are wire-wound resistors, thick film resistors, and chip resistors. Currently, it is difficult to make high-power resistors with small size while meeting the requirement of sufficient power. With the development of technology, the integration of power electronic devices is higher, and the size requirement of components is higher and higher. 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.

[0003] For example, the Chinese patent document with publication number CN109065303A discloses a woven wire-wound resistor, which belongs to the technical field of resistors. Compared with the prior art, two or more insulation separation layers are arranged in the box, each insulation separation layer is provided with a plurality of shuttle positions, the resistance strip is flexible, and the resistance strip is arranged in different shuttle positions in a detour manner. Therefore, the overall structure is compact, and longer resistance strips can be wound on the insulation separation layers under the condition of a certain box volume, meeting the demand for high power use.

[0004] For example, the Chinese patent document with publication number CN209515352U discloses a high-power resistor, which belongs to the field of resistors. Compared with traditional framework wire-wound resistors, the whole resistance strip is clamped on the support plate. This clamping structure reduces the occupied space and improves the overall space utilization under the condition of the same power. Under the condition of the same space, longer resistance strips can be arranged to improve the resistance power. There is no need to coat an insulation layer on the surface of the resistance strip and bake it, so the manufacturing process is faster and more time-saving, and the manufacturing cost is reduced. The traditional framework wire-wound resistor has a screw rod in the middle, which shortens the creepage distance. The resistance strip is only supported by the support frame and does not need additional fastening mechanisms to assist in fixing, which eliminates the traditional screw rod, prolongs the creepage distance, and improves the overall insulation performance of the product.

[0005] A large-diameter wire-wound resistor manufacturing method disclosed in Chinese patent document CN117747230A includes a wire bending step, a plate insertion step, a plate embedding step, and a fixing step. For a large-diameter resistor strip, the wire bending step first completes the bending and winding of the resistor strip, which is not blocked by the partition plate during the bending and winding process and is shaped by its own strength. The shaped resistor body is inserted into the partition plate for partitioning in the plate insertion step. In order to smoothly insert the partition plate, the partition plate in the U-shaped is divided into two parts, and the two partition plates are inserted transversely into the U-shaped and then moved longitudinally to make the partition groove clamp the bending segment of the metal strip, so as to smoothly insert the partition plate and position the bending segment of the metal strip. The positioning plate embedded in the plate embedding step can support and position the transversely adjacent partition plates and position the metal strip transversely, thereby improving the insulation safety performance.

[0006] Most of the existing wire-wound resistors are provided with slotted winding on the plate body, and the wind resistance of the plate body is large, which affects the heat dissipation performance to some extent. Moreover, the existing wire-wound resistor support is fixed, and if the resistor strip is loose, it is difficult to adjust the tension, the volume is large during transportation, and the cost is high. SUMMARY

[0007] In view of all or part of the above technical problems existing in the prior art, the present application provides an adjustable cylindrical wire-wound resistor.

[0008] To achieve the above purpose, the present application provides the following technical solutions:

[0009] An adjustable cylindrical wire-wound resistor is provided, which comprises a first disc body and a second disc body arranged side by side and separated, and a first support column is arranged between the first disc body and the second disc body;

[0010] The opposite sides of the first disc body and the second disc body are respectively arranged with a plurality of insulating support plates in a circumferential separation manner, and each support plate is arranged along the radial direction of the first disc body / second disc body; each support plate is provided with a plurality of wire insertion rings arranged in a separation manner along the length direction of the support plate;

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

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

[0013] As a further optional solution, a third disc body is further included, the first disc body, the second disc body and the third disc body are sequentially and spacedly arranged, a second support column is arranged between the second disc body and the third disc body; the support plate and the resistance wire are also arranged between the second disc body and the third disc body, and the arrangement mode is the same as that of the support plate and the resistance wire between the first disc body and the second disc body; the second support column can move along the first support column under the action of an external force, so as to adjust the distance between the second disc body and the third disc body and the tension of the resistance wire.

[0014] As a further optional solution, the side of the first disc body and the third disc body facing the second disc body is respectively provided with a plurality of first positioning grooves for embedding the support plate, and the side of the second disc body facing the first disc body and the third disc body is respectively provided with a plurality of second positioning grooves for embedding the support plate.

[0015] As a further optional solution, the support plate and the first positioning grooves / second positioning grooves are in interference fit, and the support plate can move or be separated along the length direction thereof under the action of an external force.

[0016] As a further optional solution, the first disc body, the second disc body and the third disc body are respectively circular discs, and the first support column and the second support column are respectively cylindrical columns located at the centers of the circular discs.

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

[0018] As a further optional solution, one end of the first support column is fixed to the first disc body, the second disc body is provided with a giving hole through which the first support column passes, and the second disc body can be fixed after being moved to a preset position along the first support column.

[0019] As a further optional solution, the center of the first support column is provided with a containing hole into which the second support column is inserted, and the second support column can be inserted into the containing hole to different degrees and be fixed at a preset position.

[0020] As a further optional solution, the giving hole and the first support column are in interference fit, and the containing hole and the second support column are in interference fit, so that only under the action of an external force, the second disc body and the second support column can be moved.

[0021] As a further optional solution, the first support column is provided with a first guide groove arranged along the length direction thereof on the outside of the first support column, and the side wall of the giving hole is provided with a first guide protrusion embedded in the first guide groove; the second support column is provided with a second guide groove arranged along the length direction thereof on the outside of the second support column, and the side wall of the containing hole is provided with a second guide protrusion embedded in the second guide groove.

[0022] The present application has the following beneficial effects:

[0023] Compared with the prior art, the resistance wire is wound in a wavy line shape between different disc bodies, the heat dissipation effect is good, and the peaks of the two adjacent wavy shapes are arranged in a staggered manner in the length direction of the support plate, the staggered manner of the adjacent inside and outside is achieved to reduce the mutual heating influence of the resistance wires, and the inductance is reduced, and even the inductance is eliminated.

[0024] Furthermore, by adjusting the distance between the first disc body and the second disc body, on the one hand, the volume is reduced, and transportation is facilitated; on the other hand, the tension of the resistance wire is adjusted, and the resistance wire is prevented from being shaken and broken during transportation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the adjustable cylindrical wire-wound resistor in the embodiment.

[0026] Figure 2 It is a structural schematic view of the adjustable cylindrical wire-wound resistor in the embodiment from another perspective.

[0027] Figure 3 It is a structural schematic view of the adjustable cylindrical wire-wound resistor in the embodiment after hiding the resistance wire.

[0028] Figure 4 It is Figure 3 a partial enlarged view.

[0029] Figure 5 It is a schematic view of the second support column of the resistor in the embodiment in a first support column insertion state.

[0030] REFERENCE NUMERALS:

[0031] The first disc body 1, the second disc body 2, the let-out hole 21, the first guide protrusion 22, the third disc body 3, the first support column 4, the accommodating hole 41, the first guide groove 42, the second guide protrusion 43, the second support column 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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0033] The adjustable cylindrical wire-wound resistor in the embodiment, as shown in the figure, comprises disc-shaped first and second disc bodies 1 and 2 arranged side by side and separated, and a first support column 4 is arranged between the first and second disc bodies 1 and 2, so as to limit the relative positions of the first and second disc bodies 1 and 2. Figures 1 to 5

[0034] ​The opposite sides of the first disc body 1 and the second disc body 2 are respectively provided with a plurality of insulating support plates 8 arranged in a circumferential direction, and each support plate 8 is arranged along the radial direction of the first disc body 1 / second disc body 2; each support plate 8 is provided with a plurality of threading rings 81 arranged in a length direction of the support plate 8.

[0035] The resistor further comprises a flexible resistance wire 9, which is alternately threaded through the threading rings 81 of the support plates 8 of the first disc body 1 and the second disc body 2, so that the resistance wire 9 is arranged in a plurality of wave shapes, and the plurality of wave shapes are distributed along the length direction of the support plate 8; the crests / troughs of adjacent two wave shapes are arranged in a staggered manner along the length direction of the support plate 8, and the plurality of wave shapes can be a same continuous resistance wire 9 or different resistance wires 9. The plurality of wave shapes of the resistance wire 9 are arranged from inside to outside, and adjacent wave shapes inside and outside are arranged in a staggered manner, so as to reduce the mutual heating influence of the resistance wire 9, and at the same time, the inductance can be reduced, and even the inductance can be zero.

[0036] Specifically, the resistor of the embodiment further comprises a third disc body 3, the first disc body 1, the second disc body 2 and the third disc body 3 are arranged in sequence and at intervals, a second support column 5 is arranged between the second disc body 2 and the third disc body 3, so as to limit the relative positions of the second disc body 2 and the third disc body 3; the second disc body 2 and the third disc body 3 are also provided with the support plates 8 and the resistance wire 9, and the arrangement manner is the same as that of the support plates 8 and the resistance wire 9 between the first disc body 1 and the second disc body 2.

[0037] Specifically, the side of the first disc body 1 and the third disc body 3 facing the second disc body 2 is respectively provided with a plurality of first positioning grooves 6 for embedding the support plates 8, and the side of the second disc body 2 facing the first disc body 1 and the third disc body 3 is respectively provided with a plurality of second positioning grooves 7 for embedding the support plates 8.

[0038] Specifically, the support plates 8 and the first positioning grooves 6 / second positioning grooves 7 are in interference fit, and under the action of an external force, the support plates 8 can be moved or separated along the length direction of the support plates 8. According to the resistance value and power demand, the number of the support plates 8 can be increased or reduced, so as to realize resistance value and power adjustment. The position of the support plate 8 can be moved, and the tension of the resistance wire 9 can be adjusted. In practice, the support plates 8 can be embedded into the corresponding disc body grooves after the threading of the support plates 8.

[0039] Specifically, the first disc body 1, the second disc body 2 and the third disc body 3 are circular discs, and the first support column 4 and the second support column 5 are cylindrical columns located at the centers of the circular discs.

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

[0041] In practice, the first support column 4 and / or the second support column 5 can be provided in a cylindrical shape, and a plurality of blowing holes are formed in the side wall of the cylindrical shape, and the blowing holes can blow air to the resistance wire 9 from inside to outside through the connected peripheral air pipe, so as to dissipate heat.

[0042] In practice, the resistance wire is of solid structure, having sufficient strength, or is of hollow tube structure, being easy to bend and wind.

[0043] In the embodiment, the second disc body 2 is capable of moving along the first support 4 under external force, so as to adjust the distance between the first disc body 1 and the second disc body 2 and the tension of the resistance wire 9. Similarly, the third disc body 3 and the second support 5 are capable of moving along the first support 4 under external force, so as to adjust the distance between the second disc body 2 and the third disc body 3 and the tension of the resistance wire 9.

[0044] One end of the first support 4 is fixed to the first disc body 1, and the second disc body 2 is provided with a gap hole 21 for the first support 4 to pass through, so that the second disc body 2 is capable of moving along the first support 4 to a preset position and being fixed. The center of the first support 4 is provided with a containing hole 41 for the second support 5 to insert, and the second support 5 is capable of being inserted into the containing hole 41 to different degrees and being fixed at a preset position.

[0045] Specifically, the gap hole 21 and the first support 4 are in interference fit, and the containing hole 41 and the second support 5 are in interference fit, so that the second disc body 2 and the second support 5 can only move under the action of a large enough external force, and are fixed in position without external force. In order to enhance the friction, a rubber layer can be arranged between the gap hole 21 and the first support 4, and between the containing hole 41 and the second support 5.

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

[0047] In the description of the application, it is obvious that the described embodiments are only part of the embodiments of the application, not all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0048] Therefore, the above detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0049] In the description of the application, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected or electrically connected. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

Claims

1. An adjustable cylindrical wirewound resistor characterized by: The first disc body (1) and the second disc body (2) are arranged in parallel and are separated by the first support column (4); The opposite sides of the first disc body (1) and the second disc body (2) are respectively provided with a plurality of insulating support plates (8) arranged in a circumferential direction, and each support plate (8) is arranged in a radial direction of the first disc body (1) or the second disc body (2); each support plate (8) is provided with a plurality of threading rings (81) arranged in a length direction of the support plate (8). The flexible resistance wire (9) is arranged in a plurality of wave shapes, and the plurality of wave shapes are distributed in the length direction of the support plate (8); the peaks of adjacent two wave shapes are arranged in a staggered manner in the length direction of the support plate (8). The first disc body (1) and / or the second disc body (2) can move along the first support column (4) under the action of an external force, so as to adjust the distance between the first disc body (1) and the second disc body (2) and the tension of the resistance wire (9).

2. An adjustable cylindrical wirewound resistor according to claim 1, characterized in that: The third disc body (3) is further arranged, the first disc body (1), the second disc body (2) and the third disc body (3) are arranged in sequence and are separated, the second disc body (2) and the third disc body (3) are provided with the second support column (5); the second disc body (2) and the third disc body (3) are also provided with the support plate (8) and the resistance wire (9), and the arrangement manner is the same as that of the support plate (8) and the resistance wire (9) between the first disc body (1) and the second disc body (2); the second support column (5) can move along the first support column (4) under the action of an external force, so as to adjust the distance between the second disc body (2) and the third disc body (3) and the tension of the resistance wire (9).

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

4. An adjustable cylindrical wirewound resistor according to claim 3, characterized in that: The support plate (8) is in interference fit with the first positioning groove (6) or the second positioning groove (7), and can move or be separated along the length direction of the support plate (8) under the action of an external force.

5. An adjustable cylindrical wirewound resistor according to claim 2, characterized in that: The first disc body (1), the second disc body (2) and the third disc body (3) are respectively circular discs, and the first support column (4) and the second support column (5) are respectively cylindrical columns located at the centers of the circular discs.

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

7. An adjustable cylindrical wirewound resistor according to claim 2, characterized in that: One end of the first support column (4) is fixed to the first disc body (1), the second disc body (2) is provided with a gap hole for the first support column (4) to pass through, and the second disc body (2) can be fixed after being moved to a preset position along the first support column (4).

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

9. An adjustable cylindrical wirewound resistor according to claim 8, characterized in that: The second disc body (2) and the second pillar (5) can only move under the action of external force due to the interference fit between the accommodation hole and the second pillar (5).

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

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