Power resistor for high-voltage equipment

Abstract

The utility model relates to a power resistor for high-voltage equipment, which comprises a resistor column and conductive caps fixedly arranged at two ends of the resistor column, and the conductive caps are bonded and fixed with the resistor column and are electrically connected with the resistor column; the resistance column comprises a ceramic rod, a first resistive film, a quartz tube and a second resistive film along the direction from inside to outside of the resistance column; the first resistive film is laid on the surface of the ceramic rod, the quartz tube sleeves the periphery of the ceramic rod, the second resistive film is laid on one side, away from the ceramic rod, of the quartz tube, and the first resistive film and the second resistive film are connected in series. According to the invention, the quartz tube and the second resistive film are arranged on the periphery of the first resistive film, and the first resistive film and the second resistive film are connected in series; therefore, under the condition that the size difference of the power resistor is not large, the resistance value and the power of the power resistor are obviously improved, and the design requirement of high-voltage equipment is met.

Description

Technical Field

[0001] This application relates to the technical field of resistors, and particularly to a power resistor for high-voltage equipment. Background Art

[0002] A power resistor is a resistor specifically designed to withstand higher power loads and is widely used in high-voltage equipment. Ordinary resistors are used to withstand lower power loads, while power resistors are commonly used to withstand higher power loads.

[0003] A thick-film resistor is a type of power resistor. The thick-film resistor spreads the resistor paste on an alumina ceramic substrate through screen printing; the commonly used thick-film resistor is printed and sintered with a ruthenium-based metal resistor paste, and this resistor paste is composed of ruthenium oxide, organic solvents, and glass powder.

[0004] Among them, the resistance value and power of the resistor are determined by the amount of resistor paste spread on the alumina ceramic substrate. When the high-voltage equipment has restrictions on the size of the power resistor, the power of the power resistor will also be restricted. Utility Model Content

[0005] In order to improve the power of the power resistor, this application provides a power resistor for high-voltage equipment.

[0006] A power resistor for high-voltage equipment provided by this application adopts the following technical solutions:

[0007] A power resistor for high-voltage equipment includes a resistor column and conductive cap covers fixedly arranged at both ends of the resistor column. The conductive cap covers are adhesively fixed to the resistor column and are electrically connected to the resistor column.

[0008] Along the direction from the inside to the outside of the resistor column, the resistor column includes a ceramic rod, a first resistor film, a quartz tube, and a second resistor film; the first resistor film is laid on the surface of the ceramic rod, the quartz tube is sleeved on the outer periphery of the ceramic rod, a gap for heat dissipation is provided between the quartz tube and the ceramic rod, the second resistor film is laid on the side of the quartz tube away from the ceramic rod, the quartz tube is provided with a communication hole, the first resistor film and the second resistor film are electrically connected through the communication hole, and the first resistor film and the second resistor film are connected in series; both ends of the ceramic rod and the quartz tube are adhesively fixed to the conductive cap covers, and the first resistor film, the second resistor film are electrically connected to the conductive cap covers.

[0009] By adopting the above technical solution, a quartz tube and a second resistance film are arranged on the outer periphery of the first resistance film, and the first resistance film and the second resistance film are connected in series; thereby, when the size difference of the power resistor is not significant, the resistance value and power of the power resistor are significantly increased to meet the design requirements of high-voltage equipment.

[0010] Optionally, the conductive cap is provided with a first groove for accommodating the ceramic rod, and the conductive cap is further provided with a second groove for accommodating the quartz tube.

[0011] By adopting the above technical solution, the ceramic rod is inserted into the first groove and the quartz tube is inserted into the second groove; thereby, the connection strength between the resistance rod and the conductive cap is improved.

[0012] Optionally, the quartz tube includes a cylinder body and a rib, and the cylinder body and the rib are integrally formed; the cylinder body is arranged on the outer periphery of the ceramic rod, the rib is arranged on the side of the cylinder body close to the ceramic rod, the rib is arranged on the generatrix of the cylinder body, there are several ribs, and the ribs are arranged at intervals along the inner peripheral wall of the cylinder body, and there is a clearance between the rib and the first resistance film; the second resistance film is laid on the side of the cylinder body away from the ceramic rod.

[0013] By adopting the above technical solution, through the coordinated cooperation of the cylinder body and the rib, the structural rigidity of the quartz tube is improved, the performance of the power resistor to resist external forces is improved, and the service life of the power resistor is improved.

[0014] Optionally, the conductive cap is further provided with a plurality of ventilation holes, and the ventilation holes are arranged between the first groove and the second groove.

[0015] By adopting the above technical solution,

[0016] Optionally, the conductive cap includes a first conductive cap and a second conductive cap arranged oppositely, the first conductive cap is provided with a first ventilation hole, the second conductive cap is provided with a second ventilation hole, the first ventilation hole and the second ventilation hole are arranged oppositely, and the diameter of the first ventilation hole is smaller than the diameter of the second ventilation hole.

[0017] By adopting the above technical solution, the diameter of the first ventilation hole is smaller than the diameter of the second ventilation hole; thereby, the flow rate of the gas flowing through the first ventilation hole is larger; thereby, by using the gas flow rate difference at the first ventilation hole and the second ventilation hole, the gas in the chamber flows along the direction from the second ventilation hole to the first ventilation hole to further improve the heat dissipation effect of the first resistance film.

[0018] Optionally, the first resistance film includes a plurality of resistance wires arranged in parallel, and the resistance wires are arranged in a serpentine shape.

[0019] By adopting the above technical solution, several parallel resistance wires have a large contact area with the air, which is beneficial to the heat dissipation effect of the first resistance film.

[0020] Optionally, the first resistance film includes a regular area and an encrypted area, and the encrypted area is arranged on the side of the regular area close to the second air hole; the density of the resistance wires in the encrypted area is greater than the density of the resistance wires in the regular area.

[0021] By adopting the above technical solution, the encrypted area generates more heat, so that when the gas passes through the first air hole, the flow rate of the gas can be further increased to enhance the "chimney effect".

[0022] Optionally, the distance between adjacent resistance wires in the encrypted area is not less than 3 mm, and the distance between adjacent resistance wires in the encrypted area is not less than 3.5 mm.

[0023] By adopting the above technical solution, under the condition of ensuring the resistance value and power of the first resistance film, it is beneficial to the heat dissipation effect of the first resistance film.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. By arranging a quartz tube and a second resistance film on the outer periphery of the first resistance film and making the first resistance film and the second resistance film in series; thus, when the size difference of the power resistor is not large, the resistance value and power of the power resistor are significantly increased to meet the design requirements of high-voltage equipment;

[0026] 2. Through the coordinated cooperation of the cylinder body and the convex strip, the structural stiffness of the quartz tube is improved, the performance of the power resistor against external forces is improved, and the service life of the power resistor is improved;

[0027] 3. The diameter of the first air hole is smaller than the diameter of the second air hole; thus, the flow rate of the gas flowing through the first air hole is larger; thus, by using the gas flow rate difference between the first air hole and the second air hole, the gas in the chamber flows along the direction from the second air hole to the first air hole to further improve the heat dissipation effect of the first resistance film. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the power resistor in Embodiment 1.

[0029] Figure 2 is a vertical structural sectional view of the power resistor in Embodiment 1.

[0030] Figure 3 is a horizontal structural sectional view of the power resistor in Embodiment 1.

[0031] Figure 4It is a schematic structural diagram of the power resistor in Embodiment 2.

[0032] Figure 5 It is a vertical structural sectional view of the power resistor in Embodiment 2.

[0033] Figure 6 It is a schematic diagram of the structure of the first resistance film in Embodiment 3.

[0034] Explanation of reference numerals: 1, resistance column; 11, ceramic rod; 12, first resistance film; 121, resistance wire; 122, conventional area; 123, encrypted area; 13, quartz tube; 131, cylinder body; 1311, communication hole; 132, rib; 14, second resistance film; 2, conductive cap; 21, first groove; 22, second groove; 23, first conductive cap; 231, first ventilation hole; 24, second conductive cap; 241, second ventilation hole. Detailed implementation manners

[0035] The following further elaborates on this application Figure 1-6 in conjunction with the appended drawings.

[0036] An embodiment of this application discloses a power resistor for high-voltage equipment. Referring to Figure 1 , the power resistor for high-voltage equipment includes a resistance column 1 and conductive caps 2 fixedly arranged at both ends of the resistance column 1. The conductive caps 2 are adhesively fixed to the resistance column 1 and are electrically connected to the resistance column 1. The conductive caps 2 are used to connect to other circuits.

[0037] Referring to Figure 2 and Figure 3 , along the direction from the inside to the outside of the resistance column 1, the resistance column 1 includes a ceramic rod 11, a first resistance film 12, a quartz tube 13, and a second resistance film 14. The first resistance film 12 and the second resistance film 14 are formed by printing and sintering resistance paste.

[0038] Referring to Figure 2 and Figure 3 , the first resistance film 12 is laid on the surface of the ceramic rod 11; that is, the resistance slurry is coated on the surface of the ceramic rod 11, and the first resistance film 12 is formed after sintering the resistance slurry.

[0039] Referring to Figure 2 and Figure 3, the quartz tube 13 is sleeved on the outer periphery of the ceramic rod 11, and a gap for heat dissipation is provided between the quartz tube 13 and the ceramic rod 11. The quartz tube 13 includes a barrel 131 and a convex strip 132, and the barrel 131 and the convex strip 132 are integrally formed. The barrel 131 is arranged on the outer periphery of the ceramic rod 11, and the convex strip 132 is arranged on the side of the barrel 131 close to the ceramic rod 11. The convex strip 132 is arranged on the busbar of the barrel 131, and a plurality of convex strips 132 are provided, and the convex strips 132 are arranged at intervals along the inner circumferential wall of the barrel 131, and an avoidance gap is provided between the convex strip 132 and the first resistor film 12. In this embodiment, six convex strips 132 are provided around; thereby, through the coordinated cooperation of the barrel 131 and the convex strip 132, the structural rigidity of the quartz tube 13 is improved, the performance of the power resistor in resisting external forces is improved, and the service life of the power resistor is improved. Meanwhile, the second resistor film 14 is laid on the side of the cylinder 131 away from the ceramic rod 11 ; the resistor paste is printed and spread on the side of the cylinder 131 away from the convex strip 132 , and the second resistor film 14 is formed after the resistor paste is sintered.

[0040] Reference Figure 2 and Figure 3 The body 131 of the quartz tube 13 is provided with a connecting hole 1311, and the first resistor film 12 is electrically connected to the second resistor film 14 through the connecting hole 1311, and the first resistor film 12 and the second resistor film 14 are arranged in series. In this embodiment, a metal wire is passed through the connecting hole 1311, and one end of the metal wire is connected to the first resistor film 12, and the other end of the metal wire is connected to the second resistor film 14; thereby, the first resistor film 12 and the second resistor film 14 are connected in series.

[0041] Reference Figure 1 and Figure 2 The conductive cap 2 is provided with a first slot 21 for accommodating the ceramic rod 11, and the conductive cap 2 is also provided with a second slot 22 for accommodating the quartz tube 13. The staff now applies fixing glue on the inner side of the conductive cap 2; then, the ceramic rod 11 is inserted into the first slot 21, and the quartz tube 13 is inserted into the second slot 22; thereby, the resistor column 1 and the conductive cap 2 are fixedly connected, and the connection strength between the resistor rod and the conductive cap 2 is improved.

[0042] At the same time, the first resistance film 12 is electrically connected to one of the conductive caps 2 through a metal wire; and the second resistance film 14 is electrically connected to the other conductive cap 2 through a metal wire.

[0043] The implementation principle of a power resistor for high voltage equipment in the embodiment of the present application is:

[0044] In this embodiment, a quartz tube 13 and a second resistance film 14 are arranged on the outer periphery of the first resistance film 12, and the first resistance film 12 and the second resistance film 14 are connected in series; thus, when the size difference of the power resistor is not significant, the resistance value and power of the power resistor are significantly increased to meet the design requirements of high-voltage equipment.

[0045] Embodiment 2

[0046] The difference between this Embodiment 2 and Embodiment 1 is that:

[0047] Referring to Figure 4 and Figure 5 , the relatively arranged conductive cap covers 2 are respectively named the first conductive cap cover 23 and the second conductive cap cover 24. The conductive cap cover 2 is also provided with a plurality of ventilation holes, that is, the first conductive cap cover 23 is provided with a first ventilation hole 231, the second conductive cap cover 24 is provided with a second ventilation hole 241, and the first ventilation hole 231 and the second ventilation hole 241 are arranged oppositely.

[0048] Referring to Figure 4 and Figure 5 , the ventilation holes are arranged between the first groove body 21 and the second groove body 22, and the ventilation holes are arranged between adjacent convex strips 132; that is, both the first ventilation hole 231 and the second ventilation hole 241 are arranged between the first groove body 21 and the second groove body 22. The cylinder body 131, the convex strips 132 of the quartz tube 13 and the ceramic rod 11 enclose a plurality of relatively closed chambers; since the first resistance film 12 generates heat when energized, heat is accumulated in the chambers. In this application, by opening the first ventilation hole 231 and the second ventilation hole 241 on both sides of the chamber, the chamber is communicated with the outside, which is beneficial to the heat dissipation of the first resistance film 12 to ensure the resistance value and power of the power resistor.

[0049] Referring to Figure 4 and Figure 5 , the diameter of the first ventilation hole 231 is smaller than the diameter of the second ventilation hole 241; thus, the flow rate of the gas flowing through the first ventilation hole 231 is relatively large. Thus, according to the "chimney effect", by using the gas flow rate difference between the first ventilation hole 231 and the second ventilation hole 241, the gas in the chamber flows along the direction from the second ventilation hole 241 to the first ventilation hole 231 to further improve the heat dissipation effect of the first resistance film 12. That is, the low-temperature outside air flows into the chamber from the second ventilation hole 241, flows through the surface of the first resistance film 12 to take away the heat of the first resistance film 12; finally, the gas that has absorbed the heat of the first resistance film 12 is discharged from the first ventilation hole 231.

[0050] Embodiment 3

[0051] The difference between this Embodiment 3 and Embodiment 2 is that:

[0052] Referring to Figure 6, the first resistance film 12 includes a plurality of resistance wires 121 arranged in parallel, and the resistance wires 121 are arranged in a serpentine shape; thereby increasing the contact area between the first resistance film 12 and the air, which is beneficial to the heat dissipation effect of the first resistance film 12.

[0053] Refer to Figure 6 , at the same time, the first resistance film 12 includes a conventional area 122 and an encrypted area 123, and the encrypted area 123 is arranged on one side of the conventional area 122 close to the second ventilation hole 241; the density of the resistance wires 121 in the encrypted area 123 is greater than the density of the resistance wires 121 in the conventional area 122. Thereby, more heat is generated in the encrypted area 123, so that when the gas passes through the first ventilation hole 231, the flow rate of the gas can be further increased to enhance the "chimney effect"; further promoting the flow of the gas between the quartz tube 13 and the ceramic rod 11, so as to improve the heat dissipation effect of the first resistance film 12 and give full play to the resistance value and power of the first resistance film 12.

[0054] Refer to Figure 6 , the distance between adjacent resistance wires 121 in the encrypted area 123 is not less than 3 mm, and the distance between adjacent resistance wires 121 in the encrypted area 123 is not less than 3.5 mm; to ensure the heat dissipation effect of the resistance wires 121. In this embodiment, the distance between adjacent resistance wires 121 in the encrypted area 123 is 3 mm, and the distance between adjacent resistance wires 121 in the encrypted area 123 is 3.5 mm.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A power resistor for high-voltage equipment, characterized in that: It includes a resistance column (1) and conductive cap covers (2) fixed at both ends of the resistance column (1). The conductive cap covers (2) are adhesively fixed to the resistance column (1) and are electrically connected to the resistance column (1). Along the direction from the inside to the outside of the resistance column (1), the resistance column (1) includes a ceramic rod (11), a first resistance film (12), a quartz tube (13), and a second resistance film (14). The first resistance film (12) is laid on the surface of the ceramic rod (11). The quartz tube (13) is sleeved on the outer periphery of the ceramic rod (11). There is a gap for heat dissipation between the quartz tube (13) and the ceramic rod (11). The second resistance film (14) is laid on the side of the quartz tube (13) away from the ceramic rod (11). The quartz tube (13) is provided with a communication hole (1311). The first resistance film (12) is electrically connected to the second resistance film (14) through the communication hole (1311). The first resistance film (12) and the second resistance film (14) are arranged in series. Both ends of the ceramic rod (11) and the quartz tube (13) are adhesively fixed to the conductive cap cover (2). The first resistance film (12) and the second resistance film (14) are electrically connected to the conductive cap cover (2).

2. The power resistor for high-voltage equipment according to claim 1, characterized in that: The conductive cap cover (2) is provided with a first groove body (21) for accommodating the ceramic rod (11), and the conductive cap cover (2) is further provided with a second groove body (22) for accommodating the quartz tube (13).

3. The power resistor for high-voltage equipment according to claim 1, characterized in that: The quartz tube (13) includes a cylinder body (131) and a rib (132). The cylinder body (131) and the rib (132) are integrally formed. The cylinder body (131) is arranged on the outer periphery of the ceramic rod (11). The rib (132) is arranged on the side of the cylinder body (131) close to the ceramic rod (11). The rib (132) is arranged on the generatrix of the cylinder body (131). There are several ribs (132), and the ribs (132) are arranged at intervals along the inner peripheral wall of the cylinder body (131). There is an avoidance gap between the rib (132) and the first resistance film (12). The second resistance film (14) is laid on the side of the cylinder body (131) away from the ceramic rod (11).

4. The power resistor for high-voltage equipment according to claim 2, characterized in that: The conductive cap cover (2) is further provided with a plurality of ventilation holes, and the ventilation holes are arranged between the first groove body (21) and the second groove body (22).

5. The power resistor for high-voltage equipment according to claim 4, characterized in that: The conductive cap cover (2) includes a first conductive cap cover (23) and a second conductive cap cover (24) arranged oppositely. The first conductive cap cover (23) is provided with a first ventilation hole (231), and the second conductive cap cover (24) is provided with a second ventilation hole (241). The first ventilation hole (231) and the second ventilation hole (241) are arranged oppositely. The diameter of the first ventilation hole (231) is smaller than the diameter of the second ventilation hole (241).

6. The power resistor for high-voltage equipment according to claim 5, characterized in that: The first resistance film (12) includes a plurality of resistance wires (121) arranged in parallel, and the resistance wires (121) are arranged in a serpentine shape.

7. The power resistor for high-voltage equipment according to claim 6, characterized in that: The first resistance film (12) includes a conventional area (122) and an encrypted area (123), and the encrypted area (123) is disposed on a side of the conventional area (122) close to the second air vent (241); the density of the resistance wires (121) in the encrypted area (123) is greater than the density of the resistance wires (121) in the conventional area (122).

8. The power resistor for high-voltage equipment according to claim 7, characterized in that: The distance between adjacent resistance wires (121) in the encrypted area (123) is not less than 3 mm, and the distance between adjacent resistance wires (121) in the encrypted area (123) is not less than 3.5 mm.

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