High-voltage resistor assembly

Abstract

The invention provides a high-voltage resistor assembly. The high-voltage resistor assembly comprises an outer tube; the inner pipe is arranged in the outer pipe, the inner pipe and the outer pipe are arranged in a spaced mode, the two ends of the inner pipe are each provided with an aluminum end, and the outer sides of the aluminum ends are movably connected with the inner side of the outer pipe; a plurality of layers of resistors are arranged in the axial direction of the inner tube, and a plurality of resistors are uniformly arranged in each layer by taking the center of the inner tube as a circle center; a plurality of resistor connecting points are respectively arranged between two adjacent resistors, and the resistor connecting points between two adjacent layers of resistors are connected. According to the invention, the resistors are arranged in multiple layers in the axial direction of the inner tube, and a plurality of resistors are uniformly arranged in each layer by taking the center of the inner tube as the circle center, so that the resistors are placed at equal intervals, the creepage distance and the heat dissipation area are increased, the temperature coefficient of the resistors is reduced, and the precision of the resistors is improved; the high-voltage resistor assembly formed in practical application is high in reliability and consistent in variability of resistance value, voltage coefficient and temperature coefficient.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, and in particular to a high-voltage resistor component. Background Art

[0002] High voltage resistor components are used in power electronic equipment and high voltage systems to provide stable resistance values ​​and withstand higher voltages without breakdown or damage. Among them, UHV, high precision, low temperature coefficient high voltage resistor components are widely used in the field of high voltage, UHV DC voltage precision voltage division measurement and high voltage laboratories.

[0003] When the high-voltage resistor assembly operates under high voltage, the resistance value must remain stable to ensure the normal operation of the system; therefore, the high-voltage resistor assembly needs to have excellent temperature stability and high-precision resistance value, and the reasonable structure layout and high-performance resistor can improve the accuracy of AC and DC voltage measurement, and reduce the impact of time and environmental temperature effects on the entire system; at the same time, a reasonable structure is adopted so that the hot spot temperature of the key components measured by the system will not exceed the allowable operating temperature (90°C) of the resistor and capacitor components, ensuring the long-term reliable operation of the system, avoiding the performance reduction of some key components and insulating materials caused by the above reasons, and even causing accidents caused by insulation breakdown inside and outside the system. Therefore, the present invention studies and designs a high-voltage resistor assembly. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the unreasonable structural layout of the high-voltage resistor component in the prior art that affects its measurement accuracy, thereby providing a high-voltage resistor component.

[0005] In order to solve the above problems, the present invention provides a high voltage resistor assembly, which includes:

[0006] External pipe;

[0007] An inner tube is arranged inside the outer tube and is spaced apart from the outer tube, and both ends of the inner tube are respectively provided with aluminum end caps, and the outer sides of the aluminum end caps are respectively movably connected to the inner sides of the outer tube;

[0008] Resistors, wherein the resistors are arranged in multiple layers in the axial direction of the inner tube, and each layer of the resistors is evenly arranged with the center of the inner tube as the center of the circle;

[0009] A plurality of resistor connection points are respectively arranged between two adjacent resistors, and the resistor connection points between two adjacent layers of resistors are connected.

[0010] Preferably, a thread groove is provided on the outer wall of the inner tube between the two ends of the inner tube to form an umbrella skirt, and the two ends of the thread groove are respectively close to the aluminum end heads at the two ends of the inner tube.

[0011] Preferably, the resistors are evenly arranged in the thread groove, and the distance between two adjacent resistors along the axial direction of the inner tube is the same.

[0012] Preferably, the resistor connection points are also evenly arranged in the thread groove to connect two adjacent resistors.

[0013] Preferably, the aluminum end caps are respectively provided with wiring grooves at the center of one side away from the inner tube.

[0014] Preferably, a wire hole is provided between the bottom of the wiring groove and the other side of the aluminum end cap, a connecting wire is provided in the wire hole, one end of the connecting wire passes through the wire hole and extends into the wiring groove, and the other end of the connecting wire passes through the wire hole and is connected to the nearby resistor.

[0015] Preferably, a pair of heat dissipation holes are respectively arranged on the outer tube close to the aluminum end heads, and each pair of heat dissipation holes are arranged opposite to each other along the radial direction of the outer tube.

[0016] A high voltage resistor assembly provided by the present invention has the following beneficial effects:

[0017] 1. The present invention arranges multiple layers of resistors in the axial direction of the inner tube, and each layer of resistors is evenly arranged with the center of the inner tube as the center of the circle, so that the resistors are placed at equal distances, and the creepage distance and heat dissipation area are increased. The two adjacent resistors are connected through the resistor connection point, and the resistors of the two adjacent layers are also connected, which effectively increases the heat dissipation area and creepage distance, reduces the resistance temperature coefficient and improves the resistance accuracy. The high-voltage resistor assembly formed in practical applications has high reliability, and the variability of the resistance value, voltage coefficient, and temperature coefficient is consistent;

[0018] 2. The present invention also allows air to flow more easily on the surface of the outer tube through the design of the heat dissipation holes, forming a convection channel inside the closed space of the outer tube and the inner tube. The Joule heat generated by the voltage divider is circulated away through the convection channel and the internal convection holes, thereby achieving the purpose of convection heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] The reference numerals are:

[0021] 1. Wiring slot; 2. Aluminum terminal; 3. Outer tube; 4. Inner tube; 5. Heat dissipation hole; 6. Resistor; 7. Resistor connection point; 8. Umbrella skirt. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, the present invention provides a high voltage resistor assembly, which includes:

[0023] An outer tube 3; an inner tube 4, which is arranged inside the outer tube 3 and has a gap with the outer tube 3, and the two ends of the inner tube 4 are respectively provided with aluminum end caps 2, and the outer sides of the aluminum end caps 2 are respectively movably connected with the inner side of the outer tube 3; a resistor 6, the resistor 6 is provided with multiple layers in the axial direction of the inner tube 4, and each layer of the resistor 6 is evenly provided with multiple resistors with the center of the inner tube 4 as the center of the circle; a resistor connection point 7, which is provided between two adjacent resistors 6, and the resistor connection points 7 between two adjacent layers of the resistor 6 are connected. Figure 1 As shown, a high-voltage resistor component, whose outer tube 3 and inner tube 4 are both made of glass fibers, wherein the inner tube 4 is installed in the outer tube 3 and maintains a gap with the outer tube 3, and the aluminum end caps 2 at both ends of the inner tube 4 can be connected in the form of bonding or clamping, and the connection between the outer sides of the aluminum end caps 2 and the outer tube 3 can be achieved by setting corresponding threaded rings and screwing, or by plugging or clamping; the outer tube 3 is used to support and protect the inner tube 4 and the internal resistor, and when the use scenario of the high-voltage resistor component is limited, the outer tube 3 can be cancelled; wherein the resistor 6 is a high-voltage glass glaze resistor, which has the characteristics of high voltage resistance, impact resistance, long life and small voltage coefficient. The glass glaze resistor is made of precious metal slurry coated on a high-aluminum porcelain substrate and sintered at high temperature. In the production process, temperature cycle, thermal shock and aging are used to eliminate the failed products; wherein the resistor The resistors 6 are arranged in multiple layers in the axial direction of the inner tube 4, and multiple resistors 6 in each layer are evenly arranged with the center of the inner tube 4 as the center of the circle, so that the resistors are placed at equal distances while increasing the creepage distance and heat dissipation area; wherein, two adjacent resistors 6 are connected through the resistor connection point 7, and the resistors 6 of two adjacent layers are also connected, wherein the resistor connection points 7 are connected to each other by spot welding, soldering, etc., so that multiple resistors 6 form a resistor string, and then the resistor string is wound around the outside of the inner tube 4. At the same time, the two ends of the resistor string are connected to the aluminum terminal 2, thereby effectively increasing its heat dissipation area and creepage distance, reducing the resistance temperature coefficient and improving the resistance accuracy. The high-voltage resistor assembly in actual application has high reliability, and the variability of the resistance value, voltage coefficient, and temperature coefficient is consistent; it is ensured that the temperature coefficient of the overall high-voltage resistor assembly is ≤±10ppm / ℃, and the accuracy is ≤±0.1%.

[0024] In some embodiments, the outer wall of the inner tube 4 between the two ends of the inner tube 4 is provided with a thread groove to form an umbrella skirt, and the two ends of the thread groove are respectively close to the aluminum end caps 2 at the two ends of the inner tube 4. Figure 1As shown, a thread groove is etched on the outer wall of the inner tube 4 between the two ends of the inner tube 4, and the two ends of the thread groove are respectively close to the aluminum end caps 2 at the two ends of the inner tube 4. After the thread groove is etched on the inner tube 4, a connected groove is formed, which is convenient for placing the resistor 6 therein. At the same time, the resistor string of the connected structure can be relatively wound in the thread groove, wherein the setting of the umbrella skirt can increase the creepage distance and extend the service life.

[0025] In some embodiments, the resistors 6 are evenly arranged in the thread grooves, and the distance between two adjacent resistors 6 along the axial direction of the inner tube 4 is the same. Figure 1 As shown, each resistor 6 is evenly arranged in the thread circle, and the distance between two adjacent resistors 6 in each layer of resistors 6 is the same. Since the resistors 6 are evenly distributed, when powered on, the heat generated by each resistor 6 can be evenly distributed in the entire thread circle, avoiding local overheating; this uniform temperature distribution helps to extend the service life of the resistor 6 and reduce performance degradation or damage caused by overheating. At the same time, uniform heat dissipation can also improve the thermal stability of the resistor 6, so that it can maintain stable electrical performance at different operating temperatures.

[0026] In some embodiments, the resistor connection points 7 are also evenly arranged in the thread groove to connect two adjacent resistors 6. Figure 1 As shown, the connection points are evenly arranged in the thread groove, which can ensure that each connection point has a good contact area and stability; at the same time, the resistor connection points 7 are evenly distributed and fixed in the thread groove, which can enhance the overall structural strength of the resistor 6 assembly; the evenly distributed resistor connection points 7 help to reduce the concentration of stress in a specific area and reduce the risk of loosening or damage of the connection points due to excessive stress.

[0027] In some embodiments, the aluminum end 2 is provided with a wiring slot 1 at the center of one side away from the inner tube 4. Figure 1 As shown, the wiring slots 1 at both ends of the aluminum terminal 2 are convenient for measuring a single high-voltage resistor component, and can also be used for measuring after a multi-stage high-voltage voltage divider structure is connected in series, making it easy to connect.

[0028] In some embodiments, a wire hole is provided between the bottom of the wiring slot 1 and the other side of the aluminum terminal 2, and a connecting wire is provided in the wire hole. One end of the connecting wire passes through the wire hole and extends into the wiring slot 1, and the other end of the connecting wire passes through the wire hole and is connected to the adjacent resistor 6. Figure 1As shown, the setting of the wire hole makes it convenient to directly connect the wiring slot 1 and the resistor 6 on the inner tube 4 through the connecting wire, which facilitates clearer measurement, wherein the connection between the connecting wire and the aluminum terminal 2 can be that the connecting wire is set inside the aluminum terminal 2, or the connecting wire can be fitted along the end and side wall of the aluminum terminal 2, and then the inner tube 4 and the aluminum terminal 2 are connected.

[0029] In some embodiments, a pair of heat dissipation holes 5 are respectively arranged on the outer tube 3 near the aluminum end 2, and each pair of heat dissipation holes 5 are arranged opposite to each other along the radial direction of the outer tube 3. Figure 1 As shown, the design of the heat dissipation holes 5 allows air to flow more easily on the surface of the outer tube 3, forming a convection channel inside the closed space of the outer tube 3 and the inner tube 4. The Joule heat generated by the voltage divider is circulated away through the convection channel and the inner convection holes to achieve the purpose of convection heat dissipation. Convection heat dissipation ensures that the long-term operating temperature of the key components of the system measurement will not exceed the allowable operating temperature (90°C) of the resistor and capacitor components, ensuring the long-term reliable operation of the system and avoiding the performance degradation of some key components and insulating materials due to the above reasons, or even causing accidents caused by insulation breakdown inside and outside the system.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A high voltage resistor assembly, characterized in that: include: External pipe; An inner tube is arranged inside the outer tube and is spaced apart from the outer tube, and both ends of the inner tube are respectively provided with aluminum end caps, and the outer sides of the aluminum end caps are respectively movably connected to the inner sides of the outer tube; Resistors, wherein the resistors are arranged in multiple layers in the axial direction of the inner tube, and each layer of the resistors is evenly arranged with the center of the inner tube as the center of the circle; A plurality of resistor connection points are respectively arranged between two adjacent resistors, and the resistor connection points between two adjacent layers of resistors are connected.

2. The high voltage resistor assembly according to claim 1, characterized in that: The outer wall of the inner tube between the two ends of the inner tube is provided with a thread groove to form an umbrella skirt, and the two ends of the thread groove are respectively close to the aluminum end heads at the two ends of the inner tube.

3. The high voltage resistor assembly according to claim 2, characterized in that: The resistors are evenly arranged in the thread grooves, and the distance between two adjacent resistors along the axial direction of the inner tube is the same.

4. The high voltage resistor assembly according to claim 3, characterized in that: The resistor connection points are also evenly arranged in the thread groove to connect two adjacent resistors.

5. The high voltage resistor assembly according to claim 1, characterized in that: The aluminum end heads are respectively provided with wiring grooves at the center of one side away from the inner tube.

6. The high voltage resistor assembly according to claim 5, characterized in that: A wire hole is arranged between the bottom of the wiring groove and the other side of the aluminum end head, and a connecting wire is arranged in the wire hole. One end of the connecting wire passes through the wire hole and extends into the wiring groove, and the other end of the connecting wire passes through the wire hole and is connected to the nearby resistor.

7. The high voltage resistor assembly according to claim 5, characterized in that: A pair of heat dissipation holes is arranged on the outer tube respectively close to the aluminum end head, and each pair of heat dissipation holes is arranged opposite to each other along the radial direction of the outer tube.

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