Universal high-power resistor

Abstract

The utility model provides a universal high-power resistor, which comprises a shell (1), and is characterized in that an insulating sheet (2) is arranged in the shell (1), a group of positioning support pieces (5) are arranged at the bottom of the shell (1), a ceramic rod (3) wound with alloy wires is erected on the positioning support pieces (5), two ends of the ceramic rod (3) are provided with lead-out sheets (4) correspondingly matched with the alloy wires, and the lead-out sheets (4) are connected with the shell (1). One end of the leading-out sheet (4) extends out of the shell (1), a certain distance is reserved between the ceramic rod (3) and the insulating sheet (2), and all gaps in the shell (1) are filled with potting materials (7). The resistor is simple in structure and convenient to use, and the size of the resistor is not increased on the premise that the working voltage of the resistor is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of resistors, in particular to a universal high-power resistor. Background Art

[0002] With the rapid development of my country's new energy industry, the performance requirements for pre-charge resistors in the automotive field are becoming increasingly stringent. Traditional wirewound resistors rely primarily on their own heat dissipation. However, high-power wirewound resistors have high surface temperatures. Heat dissipation is usually achieved by increasing the resistor's volume, but this is not very effective and also affects the resistor's power. Size and power can significantly impact the stability of electrical equipment.

[0003] Conventional pre-charge resistors use ceramic housings, which have insulation properties. However, the use of ceramic housings results in poor overall heat dissipation of the resistor, as temperature plays an important role in affecting the working efficiency of the resistor.

[0004] In addition, high-power resistors tend to increase in size and the manufacturing cost will increase accordingly. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provides a universal high-power resistor.

[0006] This application provides the following technical solutions:

[0007] A universal high-power resistor comprises: a housing, characterized in that an insulating sheet is provided at the bottom of the housing, a group of positioning supports are provided inside the housing, a ceramic rod wrapped with alloy wire is mounted on the positioning supports, lead pieces corresponding to the alloy wire are provided at both ends of the ceramic rod, one end of the lead piece extends out of the housing, a certain distance is left between the ceramic rod and the insulating sheet, and all gaps in the housing are filled with potting material.

[0008] On the basis of the above technical solutions, the following further technical solutions can be provided:

[0009] The outer surface of the ceramic rod is covered with a heat dissipation layer, which is an organic silicon resin, wherein the content of quartz sand is 10wt%-40wt% and the content of quartz powder is 20wt%-50wt%.

[0010] The insulating sheet is made of the same material as or different from the ceramic rod, and its area is larger than the downward projection area of ​​the ceramic rod.

[0011] The ceramic rod is an elliptical column structure as a whole.

[0012] The shell is made of metal, and a group of heat dissipation fins are evenly distributed on the outer wall of the shell.

[0013] Utility model advantages:

[0014] The utility model has a simple structure and is easy to use. Since there is a gap between the ceramic rod and the insulating sheet, the dielectric pressure resistance of the resistor is improved, the overload characteristics and energy impact resistance of the resistor are enhanced, and the working performance of the resistor is improved without increasing the volume of the resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the device;

[0016] Figure 2 yes Figure 1 BB cross-sectional view. DETAILED DESCRIPTION

[0017] like Figure 1 and 2 As shown, a universal high-power resistor includes: a shell 1, which is a slot-shaped shell made of metal aluminum. Longitudinally distributed heat dissipation fins 1a are evenly distributed on the shell walls on both sides of the shell 1. The heat dissipation fins 1a and the shell 1 are an integrated structure.

[0018] A rectangular insulating sheet 2 is bonded to the bottom surface of the tank within the housing 1. Also connected to the bottom surface is a pair of longitudinally extending support members 5. These two support members 5 are symmetrically arranged and comprise a pair of support columns 5a, with a support plate 5b spanning the tops of the columns 5a. An arcuate support groove 5c is defined on one side of the support plate 5b.

[0019] A ceramic rod 3 wrapped with alloy wire is positioned between the two supports 5. Lead tabs 4, corresponding to the alloy wire, are inserted at each end of the ceramic rod 3. The support grooves 5c support one end of the lead tab 4, allowing the ceramic rod 3 to remain suspended within the housing 1, with a gap between it and the insulating sheet 2. The other end of the lead tab 4 extends upward from the housing 1 to form an external terminal. The gap between the ceramic rod 3 and the insulating sheet 2 is 2.5 times the thickness of the insulating sheet 2.

[0020] The ceramic rod 3 is an elliptical cylindrical structure, covered with a heat dissipation layer 6. This layer is made of silicone resin containing 15% quartz sand and 45% quartz powder. The insulating sheet 2 is made of the same material and thickness as the ceramic rod 3, and its area is larger than the downward projection of the ceramic rod 3.

[0021] All gaps in the housing 1 are filled with potting material 7 , including the gaps between the ceramic rods 3 and the insulating sheets 2 .

[0022] Because the area of ​​the insulating sheet 2 is larger than the downward projection of the ceramic rod 3 and the spacing between them is small, the overall dielectric withstand voltage of the resistor is effectively improved. This increases the operating voltage without increasing the overall size of the device, effectively improving power performance.

Claims

1. A general-purpose high-power resistor, comprising: A shell (1) is characterized in that an insulating sheet (2) is provided inside the shell of the shell (1), a group of positioning support members (5) are provided at the bottom of the shell (1), a ceramic rod (3) wound with an alloy wire is mounted on the positioning support member (5), lead-out sheets (4) corresponding to the alloy wire are provided at both ends of the ceramic rod (3), one end of the lead-out sheet (4) extends out of the shell (1), a certain distance is left between the ceramic rod (3) and the insulating sheet (2), and all gaps in the shell (1) are filled with potting material (7).

2. A general-purpose high-power resistor according to claim 1, characterized in that: The material of the insulating sheet (2) is the same as or different from that of the ceramic rod (3), and its area is larger than the downward projection area of ​​the ceramic rod (3).

3. A general-purpose high-power resistor according to claim 1, characterized in that: The ceramic rod (3) is an elliptical columnar structure as a whole.

4. A general-purpose high-power resistor according to claim 1, characterized in that: A group of heat dissipation fins (1a) are evenly distributed on the outer wall of the shell (1).

5. A general-purpose high-power resistor according to claim 1, characterized in that: The distance between the ceramic rod (3) and the insulating sheet (2) is 1.5 to 4 times the thickness of the insulating sheet (2).

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