Stacked winding resistor with high heat dissipation performance

Abstract

The utility model relates to the technical field of resistors, in particular to a laminated winding resistor with high heat dissipation performance, which comprises a plurality of laminated resistor units, each resistor unit comprises a support frame and a plurality of resistor tubes, the periphery of each support frame is enclosed, the upper and lower parts of each support frame are open, and the resistor tubes are arranged in the support frames. Each resistor tube comprises an insulating supporting tube and a resistor strip spirally wound outside the supporting tube, the resistor strip is an exposed metal strip, the resistor strip comprises a main body section and a connecting section which are integrally and continuously bent and are sequentially alternated, the main body section is kept in a linear shape by virtue of the strength of the main body section, and the connecting section is in an arc shape. Every two adjacent main body sections are connected through a connecting section and are arranged in a V shape; a plurality of positioning grooves are formed in the outer side of the supporting pipe, the middle of each main body section is lapped and embedded in the corresponding positioning groove, and the supporting pipe is clamped by the two adjacent main body sections through the elasticity of the connecting section. Compared with the prior art, the resistor strip directly exposes air for heat dissipation, and the power density is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of resistance, specifically relates to a high heat dissipation performance's laminated wirewound resistance. BACKGROUND

[0002] The load box is a kind of power detection equipment, mainly to generator, uninterruptible power supply (ups), battery, power transmission equipment are carried out load detection and maintenance, and it is generator set and UPS uninterruptible power supply periodic test, maintenance tool equipment. It can be used in hospital, data center, factory enterprise and other load test.

[0003] The multiple resistance units in the existing load box are arranged in layers, each resistance unit generally adopts wirewound resistance or chip resistance, the wirewound resistance includes support rod and resistance wire spirally and tightly wound on the support rod, since the resistance wire is tightly attached to the support rod, the heat of the resistance wire is transferred to the support rod in large quantities, and the support rod needs to be cooled additionally, and the lower resistance unit greatly hinders the upper resistance unit, which affects the heat dissipation performance of the upper resistance unit. The inventor found in research and development that the heat dissipation performance of the tubular resistance needs to be improved. SUMMARY

[0004] In view of all or part of the above technical problems existing in the prior art, the utility model provides a high heat dissipation performance's laminated wirewound resistance.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] Provide a kind of high heat dissipation performance's laminated wirewound resistance, including the multiple resistance units of laminated arrangement, each resistance unit includes the support frame that is surrounded by week side and is open in upper and lower, and the multiple resistance tubes of arrangement in support frame, each resistance tube includes the support tube of insulation and the resistance strip spirally wound on the outside of support tube, it is characterized by: resistance strip is bare metal strip, resistance strip includes the main body section and the link section of one body continuous bending alternately, main body section keeps straight line shape by its own strength, link section is arc-shaped, adjacent two main body sections are connected via link section and each other V-shaped arrangement;Multiple positioning grooves are opened on the outside of support tube, the middle part of each main body section is embedded in positioning groove, and the elasticity of link section makes adjacent two main body sections clamp support tube;The resistance strip of multiple resistance tubes is electrically connected with each other.

[0007] As a further optional scheme, the groove wall of positioning groove is adapted to the outer wall of main body section and is attached.

[0008] As a further optional scheme, the cross section of resistance strip is circular, polygonal or elliptical.

[0009] As a further optional scheme, the thickness of resistance strip is uniformly set.

[0010] As a further optional solution, the main body section is non-uniform in thickness, gradually tapering from the position of the lap joint support tube to the direction close to the connecting section.

[0011] As a further optional solution, the diameter of the connecting section is smaller than that of the main body section.

[0012] As a further optional solution, the two ends of the resistance strip are provided with lead-out rings; the support frame is provided with lead-out terminals penetrating the side wall, and the lead-out rings are connected with the lead-out terminals.

[0013] As a further optional solution, the support tube is a porcelain tube or a mica tube.

[0014] As a further optional solution, a screw rod is provided in the support tube, the screw rod penetrates the support tube from both ends and penetrates out of the support frame; the two end portions of the screw rod penetrating the support tube are sleeved with a porcelain ring and a nut, the two ends of the porcelain ring abut against the inner walls of the support tube and the support frame respectively, and the nut is threadedly connected with the screw rod and abuts against the outer wall of the support frame.

[0015] As a further optional solution, the top and bottom of the support frame are provided with stacking bosses, the stacking bosses are provided with convex-concave fitting structures, so that the support frames of the upper and lower adjacent resistance units are positioned and clamped with each other.

[0016] The beneficial effects of the utility model are:

[0017] Compared with the prior art, the resistance strip is wound on the support tube, the stability strength is ensured, the support tube is provided with a positioning groove, the adjacent main body sections of the resistance strip are prevented from being close together, and the product reliability is ensured. The resistance strip directly exposes to air for heat dissipation, the power density is higher, a larger heat dissipation space is left between the resistance strip and the support tube, the diameter of the support tube can be made thinner, the wind resistance of the lower resistance unit to the upper resistance unit is smaller. There is no shell and magnesium oxide insulating powder of the existing load resistance tube, the influencing factors of the insulation and fault problems of the resistance are reduced to be lower. The high-temperature insulation failure problem of the magnesium oxide powder does not need to be considered, and the problems caused by shell corrosion do not need to be considered. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the laminated winding resistance in the embodiment.

[0019] Figure 2 It is an exploded view of the laminated winding resistance in the embodiment.

[0020] Figure 3 It is a schematic view of a single resistance unit in the embodiment.

[0021] Figure 4 It is a structural schematic view of the resistance tube in the embodiment, wherein the porcelain ring and the nut are simplified.

[0022] Figure 5 This is an exploded view of the resistor tube in the embodiment, with the resistor strip hidden.

[0023] Figure 6 This is a side view of the resistor in the embodiment.

[0024] Figure 7 This is a schematic diagram of the resistor strip in the embodiment.

[0025] Figure label:

[0026] resistor 1;

[0027] Support tube 11, positioning groove 111;

[0028] Resistance bar 12, main body section 121, connecting section 122, lead-out ring 123;

[0029] Screw 13, ceramic ring 14, nut 15;

[0030] Support frame 2, lead-out terminal 21, stacked boss 22, convex-concave interlocking structure 221. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] The stacked wire-wound resistor in this embodiment, such as Figures 1 to 7 As shown, the device includes multiple resistor units arranged in a stacked manner. Each resistor unit includes a support frame 2 that surrounds the periphery and opens at the top and bottom, and multiple resistor tubes 1 arranged within the support frame 2. Each resistor tube 1 includes an insulated support tube 11 and a resistor strip 12 spirally wound around the support tube 11. The resistor strip 12 is an exposed metal strip and includes a main body segment 121 that is continuously bent and alternately bent in sequence, and a connecting segment 122. The main body segment 121 maintains a straight shape by its own strength, and the connecting segment 122 is arc-shaped and has a certain degree of elasticity. Adjacent main body segments 121 are connected via the connecting segment 122 and are arranged in a V-shape with each other. Multiple positioning grooves 111 are opened on the outer side of the support tube 11. The middle part of each main body segment 121 overlaps and is embedded in the positioning groove 111. The elasticity of the connecting segment 122 causes adjacent main body segments 121 to clamp the support tube 11. The figure shows three resistor units, but other numbers can be stacked as needed. Multiple resistors 1 in the same resistor unit are electrically connected to each other, or different resistors 12 in different resistor units are electrically connected to each other. In practice, they can be connected in series or parallel as needed.

[0033] Specifically, the groove wall of the positioning groove 111 is adapted to fit the outer wall of the main body section 121.

[0034] Specifically, the cross-section of resistor strip 12 is circular, but it can actually be changed to a polygon or an ellipse.

[0035] Specifically, the resistor strip 12 has a uniform thickness. Alternatively, the main body segment 121 can have a non-uniform thickness, gradually tapering from the overlapping support tube 11 towards the connecting segment 122. Further, the connecting segment 122 can have a smaller diameter than the main body segment 121 for easier bending. For a straight metal strip, it is first stretched and its diameter reduced at a preset position (corresponding to the connecting segment 122) before being bent into the resistor strip 12. Specifically, the resistor strip 12 has lead-out rings 123 at both ends; the support frame 2 has lead-out terminals 21 penetrating the sidewall, and the lead-out rings 123 are connected to the lead-out terminals 21.

[0036] Specifically, the support tube 11 is a ceramic tube or a mica tube.

[0037] Specifically, a screw 13 is inserted through the support tube 11, extending from both ends of the support tube 11 and beyond the support frame 2. Ceramic rings 14 and nuts 15 are fitted onto the two ends of the screw 13 extending through the support tube 11. The ceramic rings 14 are convex in shape, fitting around the screw 13 and abutting against the end face of the support tube 11. The nuts 15 are threaded into the screw 13. The ceramic rings 14 and nuts 15 work together to fix the entire resistor tube 1 to the support frame 2.

[0038] In this embodiment, the top and bottom of the support frame 2 are provided with stacking bosses 22, and the stacking bosses 22 are provided with a convex-concave interlocking structure 221, so that the support frames 2 of two adjacent resistor units are positioned and locked together, achieving fast and accurate stacking.

[0039] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] In the description of the utility model, it is necessary to explain that the terms "middle", "upper", "lower", "horizontal", "inner", "outer" and the like indicate the position or location relationship based on the position or location relationship shown in the drawings, or the position or location relationship of the product of the application when it is usually placed, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0042] In the description of the utility model, it is necessary to explain that the terms "setting", "connection", "connection" should be understood broadly unless otherwise specified and limited, for example, it can be fixedly connected, 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 two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A high heat dissipation performance stacked wire-wound resistor, comprising multiple resistor units stacked together, each resistor unit comprising a support frame (2) surrounding the periphery and open at the top and bottom, and multiple resistor tubes (1) arranged within the support frame (2), each resistor tube (1) comprising an insulated support tube (11) and a resistor strip (12) spirally wound around the support tube (11), characterized in that: The resistor strip (12) is an exposed metal strip. The resistor strip (12) includes a main body section (121) and a connecting section (122) that are continuously bent and alternately arranged. The main body section (121) maintains a straight shape by its own strength. The connecting section (122) is arc-shaped. Adjacent main body sections (121) are connected by the connecting section (122) and arranged in a V-shape. Multiple positioning grooves (111) are opened on the outside of the support tube (11). The middle part of each main body section (121) overlaps and is embedded in the positioning groove (111). The elasticity of the connecting section (122) causes adjacent main body sections (121) to clamp the support tube (11). The resistor strips (12) of multiple resistor tubes (1) are electrically connected to each other.

2. The high heat dissipation performance stacked wire-wound resistor according to claim 1, characterized in that: The groove wall of the positioning groove (111) is adapted to fit the outer wall of the main body section (121).

3. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The cross-section of the resistor strip (12) is circular, polygonal or elliptical.

4. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The thickness of the resistor strip (12) is set uniformly.

5. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The main body section (121) is not uniformly thinned, and gradually becomes thinner from the part of the overlapping support pipe (11) towards the connecting section (122).

6. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The diameter of the connecting section (122) is smaller than that of the main section (121).

7. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The resistor bar (12) has lead-out rings (123) at both ends; the support frame (2) has lead-out terminals (21) that penetrate the side wall, and the lead-out rings (123) are connected to the lead-out terminals (21).

8. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The support tube (11) is a ceramic tube or a mica tube.

9. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: A screw (13) is inserted through the support tube (11). The screw (13) passes through both ends of the support tube (11) and extends to the outside of the support frame. A ceramic ring (14) and a nut (15) are fitted at both ends of the screw (13) that pass through the support tube (11). The two ends of the ceramic ring abut against the inner wall of the support tube and the support frame, respectively. The nut is threadedly connected to the screw and abuts against the outer wall of the support frame.

10. A high-heat-dissipation-performance stacked wire-wound resistor according to claim 1, characterized in that: The top and bottom of the support frame (2) are provided with stacked bosses (22), and the stacked bosses (22) are provided with a convex-concave interlocking structure (221) so that the support frames (2) of two adjacent resistor units are positioned and locked together.

Images