Alloy current detection resistor with convenient heat dissipation

Abstract

The utility model discloses an alloy current detection resistance convenient to radiate, specifically related to resistance technical field, including resistance body, the top of resistance body is equipped with the copper base plate for radiating, both sides of resistance body all are seted up with the mounting groove, and the inside of two mounting grooves all are fixedly installed with the connecting block. The utility model discloses an alloy current detection resistance convenient to radiate, in actual work, the two connecting plates are bent to a certain extent, make two connecting blocks can insert and pass two connecting holes, two connecting plates will insert two mounting grooves, then rotate two limit blocks until not with two connecting holes coincide, when needing to disassemble, only need to rotate two limit blocks until with connecting hole coincide and the two connecting plates are bent to a certain extent, can take down the copper base plate, then take out the fin from the slot, thereby convenient to the disassembly of fin, effectively avoid the normal use of resistance body because of the damage of fin.

Description

Technical Field

[0001] This utility model relates to the field of resistance technology, and in particular to an alloy current detection resistor that is easy to dissipate heat. Background Technology

[0002] Alloy current sensing resistors are electronic components used for precise current measurement. Their core material is usually an alloy with a low temperature coefficient and high stability. The power of a current sensing resistor is mainly determined by its size and heat dissipation structure. Since the size of the resistor is subject to strict standard limitations, it is not possible to arbitrarily increase the size in order to increase the power. Instead, the power of the resistor product is generally increased by lowering the temperature of the resistor while keeping the size constant.

[0003] A search revealed, for example, that invention with publication number CN116246847A discloses a multi-layer heat-dissipating alloy current-sensing resistor, comprising electrodes, an electroplated copper layer, an adhesive film, a resistance alloy, a protective layer, structural adhesive, a voltage sampling pin, an electroplated nickel layer, and an electroplated tin layer. The resistance alloy is bonded to the electrodes through the adhesive film. This invention uses a heat sink to dissipate heat from the resistor. However, the heat sink is inconvenient to disassemble, making it difficult to replace when it is damaged after prolonged use, thus affecting the normal use of the resistor. Therefore, to solve the above defects, the inventors propose an alloy current-sensing resistor with convenient heat dissipation. Utility Model Content

[0004] The main purpose of this invention is to provide an alloy current sensing resistor that is easy to dissipate, which can effectively solve the problem that the heat sink of the resistor is inconvenient to disassemble in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An alloy current sensing resistor with convenient heat dissipation includes a resistor body. The top surface of the resistor body is provided with a copper substrate for heat dissipation. Mounting grooves are provided on both sides of the resistor body, and connecting blocks are fixedly installed inside the two mounting grooves. Limiting blocks are rotatably connected to the side of the two connecting blocks away from the mounting grooves, and the cross-sectional shape of the limiting blocks is the same as the cross-sectional shape of the connecting blocks.

[0007] Preferably, connecting plates are fixedly installed on both sides of the bottom surface of the copper substrate, and connecting holes are opened on one side of each of the two connecting plates, with each connecting hole corresponding to one of the two connecting blocks. Rubber gaskets are fixedly installed on one side of each of the two connecting plates located at the connecting holes.

[0008] Preferably, a thermally conductive layer is fixedly installed on the bottom surface of the copper substrate, and a phase change material interlayer is fixedly installed on the bottom surface of the thermally conductive layer.

[0009] Preferably, the top surface of the copper substrate is provided with a plurality of heat sinks, and the top surface of the copper substrate is provided with a plurality of slots.

[0010] Preferably, the inner bottom surface of the slot is provided with a storage groove, and silicone pads are fixedly installed on both sides of the inner wall of the slot.

[0011] Preferably, the bottom cross-sectional shape of the heat sink is the same as the cross-sectional shape of the slot.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model discloses an alloy current sensing resistor with convenient heat dissipation. By setting two connecting plates, in actual operation, the two connecting plates are bent to a certain extent so that the two connecting blocks can be inserted and pass through the two connecting holes. The two connecting plates will then be inserted into the two mounting slots. After that, the two limiting blocks are rotated so that they do not coincide with the two connecting holes. When disassembly is required, simply rotate the two limiting blocks until they coincide with the connecting holes and bend the two connecting plates to a certain extent to remove the copper substrate. Then, the heat sink can be pulled out of the slot, which facilitates the disassembly of the heat sink and effectively avoids the normal use of the resistor due to damage to the heat sink. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the mounting groove structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the connecting plate structure of this utility model;

[0017] Figure 4 This is a bottom view of the copper substrate structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the heat sink structure of this utility model;

[0019] Figure 6 For the present utility model Figure 5 Enlarged view of section A.

[0020] In the diagram: 1. Resistor; 2. Copper substrate; 101. Mounting slot; 102. Connecting block; 103. Limiting block; 201. Connecting plate; 202. Rubber gasket; 203. Connecting hole; 204. Thermal conductive layer; 205. Phase change material interlayer; 206. Heat sink; 2021. Slot; 2022. Silicone pad; 2023. Storage slot. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] This utility model discloses an alloy current sensing resistor that facilitates heat dissipation, such as... Figures 1-6 As shown, it includes a resistor 1. When the resistor 1 is running, the current to be measured flows in from the current terminal, passes through the alloy resistor, and generates a small voltage across the resistor according to Ohm's law. The voltage is measured by an external circuit such as an instrumentation amplifier connected to the voltage terminal. The measured voltage is divided by the known resistance value to obtain the real-time current. The top surface of the resistor 1 is provided with a copper substrate 2 for heat dissipation. The copper substrate 2 can effectively conduct heat.

[0023] The resistor 1 has mounting slots 101 on both sides, and a connecting block 102 is fixedly installed inside each mounting slot 101. The connecting block 102 is made of nylon and has a hard coating on its surface. The side of each connecting block 102 away from the mounting slot 101 is rotatably connected to a limiting block 103. The limiting block 103 is made of the same material as the connecting block 102, and the limiting block 103 can rotate. The cross-sectional shape of the limiting block 103 is the same as the cross-sectional shape of the connecting block 102.

[0024] Connecting plates 201 are fixedly installed on both sides of the bottom surface of the copper substrate 2. The connecting plates 201 are made of polyetheretherketone, which has the effects of high temperature resistance and insulation, thus enabling the connecting plates 201 to be deformed and bent to a certain extent. Connecting holes 203 are opened on one side of the two connecting plates 201, and the two connecting holes 203 correspond one-to-one with the two connecting blocks 102. The shape of the connecting holes 203 is the same as that of the connecting blocks 102 and the limiting blocks 103. Rubber gaskets 202 are fixedly installed on one side of the two connecting plates 201 located at the connecting holes 203.

[0025] During installation, the user manually pushes the two connecting plates 201 to deform and bend them to a certain extent so that the limiting block 103 and the connecting block 102 can pass through the connecting hole 203. Then, the limiting block 103 is rotated so that it does not coincide with the connecting hole 203. When the limiting block 103 is rotated, the limiting block 103 will contact the rubber washer 202, thereby causing the rubber washer 202 to deform and increase the friction of the limiting block 103, so as to fix the copper substrate 2 to the top surface of the resistor 1.

[0026] When it is necessary to disassemble the copper substrate 2, simply rotate the two limiting blocks 103 manually so that the two limiting blocks 103 coincide with the two connecting holes 203, and then manually bend the two connecting plates 201 to a certain extent to remove the two connecting plates 201 from the outer surface of the two connecting blocks 102, and the copper substrate 2 can be removed.

[0027] A thermally conductive layer 204 is fixedly mounted on the bottom surface of the copper substrate 2. The thermally conductive layer 204 is an aluminum nitride ceramic pad, and a phase change material interlayer 205 is fixedly mounted on the bottom surface of the thermally conductive layer 204. The phase change material interlayer 205 is a paraffin-based PCM. The phase change material interlayer 205 absorbs the transient heat generated by the resistor 1 and slows down the temperature rise rate. The thermally conductive layer 204 quickly conducts the heat released by the phase change material to the copper substrate 2, avoiding heat accumulation. The space between the phase change material interlayer 205 and the thermally conductive layer 204 is filled with aluminum nitride silicone grease using vacuum injection. Compared with the traditional method of directly attaching the resistor 1 to the copper substrate, the above structure can effectively improve the heat conduction effect.

[0028] The top surface of the copper substrate 2 is provided with multiple heat sinks 206, which are made of aluminum alloy. When the heat of the resistor 1 is transferred to the heat sink 206 through the copper substrate 2, the air is heated and rises, carrying away the heat on the surface of the heat sink 206. The heat generated by the resistor 1 is transferred to the phase change material interlayer 205, then to the thermally conductive layer 204, and then to the copper substrate 2 through the thermally conductive layer 204. Finally, it is transferred to the heat sink 206 through the copper substrate 2 to complete the heat dissipation of the resistor 1. The top surface of the copper substrate 2 is provided with multiple slots 2021.

[0029] The inner bottom surface of the slot 2021 is provided with a storage groove 2023, which is filled with thermal grease. Silicone pads 2022 are fixedly installed on both sides of the inner wall of the slot 2021. The silicone pads 2022 are made of fluorosilicone rubber. The bottom cross-sectional shape of the heat sink 206 is the same as the cross-sectional shape of the slot 2021. Both the bottom cross-sectional shape of the heat sink 206 and the cross-sectional shape of the slot 2021 are trapezoidal.

[0030] Insert the bottom of the heatsink 206 into the slot 2021. During the insertion process, it will come into contact with the silicone pad 2022, which can increase the friction, thereby completing the installation of the heatsink 206.

[0031] The working principle of this utility model is as follows: First, the operator fills the storage tank 2023 with thermal grease, inserts the bottom of the heat sink 206 into the slot 2021, and during the insertion process, it will come into contact with the silicone pad 2022. The silicone pad 2022 can increase the friction until the bottom of the heat sink 206 is completely inserted into the slot 2021, thereby completing the installation of the heat sink 206. The above steps are repeated to install multiple heat sinks 206 in sequence on the top surface of the copper substrate 2.

[0032] The workers then bend the two connecting plates 201 to a certain extent so that the two connecting blocks 102 can be inserted into and pass through the two connecting holes 203. The two connecting plates 201 will then be inserted into the two mounting slots 101. After that, the two limiting blocks 103 are rotated so that they do not overlap with the two connecting holes 203. Then the copper substrate 2 with heat sink 206 can be installed on the top surface of the resistor 1 for heat dissipation.

[0033] When the heat sink 206 needs to be replaced or repaired, the user only needs to rotate the two limiting blocks 103 until they coincide with the connecting holes 203, and then bend the two connecting plates 201 to a certain extent to remove the copper substrate 2. After that, the multiple heat sinks 206 can be pulled out from the multiple slots 2021 in sequence.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An alloy current sensing resistor with convenient heat dissipation, comprising a resistive element (1), characterized in that: The top surface of the resistor (1) is provided with a copper substrate (2) for heat dissipation. The resistor (1) has mounting grooves (101) on both sides, and connecting blocks (102) are fixedly installed inside the two mounting grooves (101). The two connecting blocks (102) are rotatably connected to a limiting block (103) on the side away from the mounting groove (101), and the cross-sectional shape of the limiting block (103) is the same as the cross-sectional shape of the connecting block (102).

2. The alloy current sensing resistor with convenient heat dissipation according to claim 1, characterized in that: Connecting plates (201) are fixedly installed on both sides of the bottom surface of the copper substrate (2). Connecting holes (203) are opened on one side of each of the two connecting plates (201), and the two connecting holes (203) correspond one-to-one with the two connecting blocks (102). Rubber gaskets (202) are fixedly installed on one side of each of the two connecting plates (201) located at the connecting holes (203).

3. The alloy current sensing resistor with convenient heat dissipation according to claim 1, characterized in that: A thermally conductive layer (204) is fixedly installed on the bottom surface of the copper substrate (2), and a phase change material interlayer (205) is fixedly installed on the bottom surface of the thermally conductive layer (204).

4. The alloy current sensing resistor with convenient heat dissipation according to claim 1, characterized in that: The top surface of the copper substrate (2) is provided with a plurality of heat sinks (206), and the top surface of the copper substrate (2) is provided with a plurality of slots (2021).

5. The alloy current sensing resistor with convenient heat dissipation according to claim 4, characterized in that: The slot (2021) has a storage groove (2023) on its inner bottom surface, and silicone pads (2022) are fixedly installed on both sides of the inner wall of the slot (2021).

6. The alloy current sensing resistor with convenient heat dissipation according to claim 4, characterized in that: The bottom cross-sectional shape of the heat sink (206) is the same as the cross-sectional shape of the slot (2021).

Images