Aluminum shell resistor with thermal protection

Abstract

The application relates to the field of resistors, in particular to an aluminum shell resistor with heat protection, which comprises a shell, the inside of the shell is filled with a filling layer, a resistor core and a heat protection piece are embedded in the inside of the filling layer, one end of the resistor core is connected with one end of the heat protection piece, a first electric wire is fixedly connected to the end of the resistor core away from the heat protection piece, a second electric wire is fixedly connected to the end of the heat protection piece away from the resistor core, the first electric wire and the second electric wire are led out to the outside of the filling layer, and the first electric wire and the second electric wire are used for connecting an electric load. The application has the effect of reducing the occurrence of hazards caused by the overheating of the aluminum shell resistor.

Description

Technical Field

[0001] This application relates to the field of resistors, and in particular to an aluminum-cased resistor with thermal protection. Background Technology

[0002] Aluminum-cased resistors, as a common type of resistor, play an important role in converting electrical energy into heat energy in many electronic devices. The stability of their performance directly affects the normal operation and service life of electronic devices.

[0003] In existing technologies, the use of aluminum-cased resistors typically focuses only on their basic resistive properties, such as resistance value and power rating. When an aluminum-cased resistor is in operation, it converts electrical energy into heat energy. To ensure its normal operation, its heat dissipation performance is often improved by optimizing the resistor's materials and structure.

[0004] However, these conventional heat dissipation methods have certain limitations. During operation, aluminum-cased resistors may still overheat due to various factors, such as prolonged high-load operation and excessively high ambient temperatures. When the temperature is too high, it may not only affect the performance of the resistor itself and shorten its lifespan, but may also cause safety hazards, such as fires. Utility Model Content

[0005] In order to reduce the occurrence of hazards caused by overheating of aluminum-cased resistors, this application provides an aluminum-cased resistor with thermal protection.

[0006] This application provides an aluminum-cased resistor with thermal protection, employing the following technical solution: A thermally protected aluminum-cased resistor includes a casing, the interior of which is filled with a filling layer. A resistor core and a thermal protection element are embedded within the filling layer. One end of the resistor core is connected to one end of the thermal protection element. A first wire is fixedly connected to the end of the resistor core away from the thermal protection element, and a second wire is fixedly connected to the end of the thermal protection element away from the resistor core. Both the first and second wires extend to the outside of the filling layer and are used to connect to an electrical load.

[0007] By adopting the above technical solution and adding a thermal protection component to the aluminum-cased resistor, the power supply can be cut off in time when the resistor temperature is too high, reducing the possibility of damage caused by overheating. Simultaneously, the electrical load is connected via the first and second wires to achieve the function of converting electrical energy into heat energy.

[0008] Optionally, the thermal protection component is a thermal protection switch, and both ends of the thermal protection component are connected to a third wire. The third wire extends to the outside of the filling layer and is used to connect to a circuit breaker.

[0009] By adopting the above technical solution, the thermal protection component is set as a thermal protection switch and connected to a third wire for connecting the circuit breaker. When the temperature is too high, the thermal protection switch will disconnect. Since the thermal protection switch will automatically open when the temperature returns to normal, the circuit breaker can be connected to cut off the power. This makes it convenient for maintenance personnel to select to open the circuit breaker to reconnect the circuit after maintenance is completed.

[0010] Optionally, the thermal protection component is a fuse, and both ends of the thermal protection component are connected to a third wire. The third wire extends to the outside of the filling layer and is used to connect to the testing equipment.

[0011] By adopting the above technical solution, maintenance personnel can use testing equipment to connect a third wire to easily determine whether the fuse has blown.

[0012] Optionally, the third wire is fitted with an insulating sleeve, one end of which is fixedly embedded in the filling layer, and the other end of the insulating sleeve away from the filling layer is damped by an insulating block.

[0013] By adopting the above technical solution, the third wire can be stored inside the insulating sleeve and shielded by the insulating block, which can effectively prevent the third wire from being accidentally exposed and improve safety.

[0014] Optionally, a limiting plate is fixedly installed inside the insulating sleeve. The limiting plate has two limiting holes for the third wire to pass through.

[0015] By adopting the above technical solution, the third wire passes through the two limiting holes in sequence, so that the end of the third wire away from the heat protection component faces the filling layer, which plays a protective role.

[0016] Optionally, the third wire is fixedly installed with a limiting ring, the outer diameter of which gradually decreases, and the limiting ring is used to insert into a limiting hole.

[0017] By adopting the above technical solution, the third wire is fixedly installed with a limiting ring whose outer diameter gradually decreases and is inserted into the limiting hole, which can limit the position of the third wire and make the position of the third wire more stable.

[0018] Optionally, the outer wall of the housing is provided with multiple heat dissipation grooves.

[0019] By adopting the above technical solution, the heat dissipation area of ​​the aluminum-cased resistor can be increased, which helps to dissipate the heat generated when the aluminum-cased resistor converts electrical energy into heat energy, reducing the occurrence of damage caused by excessive temperature.

[0020] In summary, this application includes at least one of the following beneficial technical effects: By embedding a thermal protection component in the filling layer and connecting it to the resistor core, the power supply can be cut off in time when the temperature of the aluminum shell resistor is too high, reducing the occurrence of safety hazards caused by the aluminum shell resistor due to excessive temperature. Multiple heat dissipation grooves are provided on the outer wall of the casing, which helps to improve the heat dissipation performance of the aluminum-cased resistor and helps maintain its normal operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a cross-sectional view of Embodiment 1 of this application; Figure 3 This is a cross-sectional view of Embodiment 2 of this application; Figure 4 yes Figure 3 Enlarged view at point A.

[0022] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Filling layer; 3. Resistor core; 4. Thermal protection component; 5. First wire; 6. Second wire; 7. Third wire; 8. Heat dissipation groove; 9. Insulating sleeve; 10. Insulating block; 11. Limiting plate; 12. Limiting hole; 13. Limiting ring. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. Example 1

[0024] This application discloses an aluminum-cased resistor with thermal protection.

[0025] Reference Figure 1 , Figure 2 A thermally protected aluminum-cased resistor includes a casing 1, a filling layer 2, a resistor core 3, and a thermal protection element 4. The filling layer 2 is fixedly installed inside the casing 1, and the resistor core 3 and the thermal protection element 4 are embedded deep within the filling layer 2. The filling layer 2 is generally composed of quartz sand and epoxy resin. The filling layer 2 ensures electrical insulation between the resistor core 3 and the thermal protection element 4, and also transfers heat to the casing 1 for heat dissipation. The function of the filling layer 2 is to fix the resistor core 3 and the thermal protection element 4, while also providing protection, insulation, and auxiliary heat dissipation.

[0026] One end of the resistor core 3 is connected to one end of the thermal protection component 4. A first wire 5 is fixedly connected to the end of the resistor core 3 away from the thermal protection component 4, and a second wire 6 is fixedly connected to the end of the thermal protection component 4 away from the resistor core 3. Both the first wire 5 and the second wire 6 are led out to the outside of the filling layer 2, and are used to connect the electrical load.

[0027] In this embodiment, the thermal protection element 4 is a thermal protection switch. Both ends of the thermal protection element 4 are connected to a third wire 7, which extends to the outside of the filling layer 2.

[0028] Reference Figure 1 , Figure 2 A thermal protection switch is a device that automatically controls the on / off state of a circuit based on temperature changes. It can be a bimetallic thermal protection switch, where the bimetallic strip is made of two metal strips with different coefficients of thermal expansion bonded together. When the temperature rises, the bimetallic strip bends, thereby pushing the contacts to break the circuit. The third wire 7 is used to connect to the circuit breaker, a protective device that automatically disconnects the circuit when overload, short circuit, or other faults occur. When the thermal protection switch detects that the temperature of the resistor core 3 is too high, it disconnects the circuit and simultaneously sends a signal to the circuit breaker via the third wire 7, causing the circuit breaker to further disconnect the entire circuit, enhancing the circuit's protection function. Thus, even after the thermal protection switch automatically turns on when the temperature drops, the entire circuit remains de-energized, requiring maintenance personnel to manually open the circuit breaker to restore power.

[0029] Reference Figure 1 The outer wall of the housing 1 has multiple heat dissipation grooves 8. The heat dissipation grooves 8 help to increase the surface area of ​​the aluminum housing resistor, thereby improving the heat dissipation performance of the aluminum housing resistor.

[0030] The implementation principle of the aluminum-cased resistor with thermal protection in this application embodiment is as follows: When the aluminum-cased resistor with thermal protection is connected to the circuit, the resistor core 3 converts electrical energy into heat energy. The filling layer 2 serves as insulation and auxiliary heat dissipation, transferring heat to the casing 1. When the resistor core 3 becomes too hot due to prolonged high-load operation, excessively high ambient temperature, or other factors, the thermal protection component 4 activates, cutting off the circuit and reducing the risk of safety hazards caused by excessively high temperature of the aluminum-cased resistor. Example 2

[0031] This application discloses an aluminum-cased resistor with thermal protection.

[0032] Reference Figure 3 , Figure 4 The difference between the aluminum-cased resistor with thermal protection in this embodiment and that in embodiment 1 is that the thermal protection component 4 is a fuse, and the third wire 7 is used to connect to the testing equipment.

[0033] A fuse is used as the thermal protection component 4. When the temperature of the aluminum shell resistor becomes too high, causing an abnormal increase in current, the fuse blows and cuts off the circuit. When maintenance personnel repair the circuit, they connect to a testing device via a third wire 7 to determine whether the fuse has blown.

[0034] The third wire 7 is fitted with an insulating sleeve 9. One end of the insulating sleeve 9 is fixedly embedded in the filling layer 2, and the end of the insulating sleeve 9 away from the filling layer 2 is damped by an insulating block 10. A limiting plate 11 is fixedly installed inside the insulating sleeve 9. The limiting plate 11 has two limiting holes 12 for the third wire 7 to pass through. A limiting ring 13 is fixedly installed on the third wire 7. The outer diameter of the limiting ring 13 gradually decreases, and the limiting ring 13 is used to insert into the limiting hole 12.

[0035] The implementation principle of the aluminum-cased resistor with thermal protection in this application embodiment is as follows: the insulating sleeve 9 and the insulating block 10 wrap the third wire 7, which helps to protect the third wire 7 and reduce the possibility of accidental contact with the third wire 7. After the third wire 7 passes through the two limiting holes 12 in sequence, the limiting ring 13 is inserted into the limiting hole 12 for fixation, thereby bending the third wire 7 towards the filling layer 2, which facilitates the separation of the third wire 7 from the insulating sleeve 9 and the insulating block 10.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A resistor with thermal protection in an aluminum case, characterized in that: The device includes a housing (1), which is filled with a filling layer (2). A resistor core (3) and a thermal protection element (4) are embedded in the filling layer (2). One end of the resistor core (3) is connected to one end of the thermal protection element (4). A first wire (5) is fixedly connected to the end of the resistor core (3) away from the thermal protection element (4). A second wire (6) is fixedly connected to the end of the thermal protection element (4) away from the resistor core (3). Both the first wire (5) and the second wire (6) are led out to the outside of the filling layer (2). The first wire (5) and the second wire (6) are used to connect to the electrical load.

2. The aluminum-cased resistor with thermal protection according to claim 1, characterized in that: The thermal protection component (4) is a thermal protection switch. Both ends of the thermal protection component (4) are connected to a third wire (7). The third wire (7) is led out to the outside of the filling layer (2) and is used to connect to the circuit breaker.

3. The aluminum-cased resistor with thermal protection according to claim 1, characterized in that: The thermal protection component (4) is a fuse. Both ends of the thermal protection component (4) are connected to a third wire (7). The third wire (7) is led out to the outside of the filling layer (2) and is used to connect to the detection equipment.

4. The aluminum-cased resistor with thermal protection according to claim 3, characterized in that: The third wire (7) is fitted with an insulating sleeve (9), one end of which is fixedly embedded in the filling layer (2), and the end of the insulating sleeve (9) away from the filling layer (2) is damped by an insulating block (10).

5. The aluminum-cased resistor with thermal protection according to claim 4, characterized in that: The insulating sleeve (9) is fixedly installed with a limiting plate (11), and the limiting plate (11) has two limiting holes (12), which are used for the third wire (7) to pass through.

6. The aluminum-cased resistor with thermal protection according to claim 3, characterized in that: The third wire (7) is fixedly installed with a limiting ring (13), the outer diameter of which gradually decreases, and the limiting ring (13) is used to insert into the limiting hole (12).

7. The aluminum-cased resistor with thermal protection according to claim 1, characterized in that: The outer wall of the housing (1) is provided with multiple heat dissipation grooves (8).

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