High-precision high-voltage divider resistor

Abstract

The utility model discloses a high-precision high-voltage voltage-dividing resistor, and relates to the field of electrical elements, the high-precision high-voltage voltage-dividing resistor comprises a porcelain tube, a double-strand resistance wire and two wiring terminals, the two wiring terminals are located at the same end position of the porcelain tube, the double-strand resistance wire is provided with two strands of resistance wires, the two strands of resistance wires are correspondingly connected with the two wiring terminals respectively, and the two strands of resistance wires are connected with the two wiring terminals respectively. And the double-strand resistance wire spirally extends on the outer wall of the porcelain tube along the direction far away from the wiring terminal and is connected at the tail end. The problem that in the prior art, a resistor is poor in adaptability in a high-frequency voltage scene can be solved.

Description

Technical Field

[0001] The present application relates to the field of electrical components, and particularly to a high-precision high-voltage voltage-dividing resistor. Background Art

[0002] Resistors are the most widely used components in all electronic circuits. In a power system, two resistors with a high and a low resistance value are connected in series. Then, a voltage-dividing terminal is led out from the common connection point of the two resistors to achieve the voltage-dividing effect.

[0003] Common resistors wrap the wound resistance wire with a casing and then extend the wire ends from both ends. Such wire-wound resistors have the advantages of small temperature coefficient and high precision. However, due to the influence of inductance, the adaptability of such resistors in high-frequency voltage scenarios is poor. Utility Model Content

[0004] In order to improve the problem of poor adaptability of resistors in high-frequency voltage scenarios in the prior art, the present application provides a high-precision high-voltage voltage-dividing resistor.

[0005] The high-precision high-voltage voltage-dividing resistor provided by the present application adopts the following technical solutions:

[0006] A high-precision high-voltage voltage-dividing resistor includes a porcelain tube, a double-strand resistance wire, and two terminal blocks. The two terminal blocks are located at the same end position of the porcelain tube. The double-strand resistance wire has two strands of resistance wire, and the two strands of resistance wire are respectively connected to the two terminal blocks. The double-strand resistance wire spirally extends along the outer wall of the porcelain tube in a direction away from the terminal blocks and is connected at the end.

[0007] By adopting the above technical solution, since the directions of the interaction magnetic fields generated by the two strands of resistance wire of the double-strand resistance wire are opposite and the magnitudes are similar, the influence of the interaction magnetic fields generated by the two strands of resistance wire on the current can be offset to a certain extent, which is beneficial to enabling the resistor to better adapt to high-frequency voltage scenarios.

[0008] Optionally, a plurality of coarse adjustment resistance points are provided at a position of the double-strand resistance wire away from the terminal blocks. The coarse adjustment resistance points are simultaneously connected to the two strands of resistance wire, and the coarse adjustment resistance points are distributed at intervals along the extension path of the double-strand resistance wire.

[0009] By adopting the above technical solution, by cutting off the coarse adjustment resistance points, the effective conductive length of the double-strand resistance wire can be changed, thereby realizing the adjustment of the voltage division ratio of the voltage-dividing resistor, which is beneficial to improving the precision of voltage division.

[0010] Optionally, one of the two resistance wires is provided with a connecting conductor, the connecting conductor is connected to the terminal, and a plurality of fine-tuning resistance points are provided between the connecting conductor and the resistance wire where it is located, and the distance between the fine-tuning resistance points is smaller than the distance between the coarse-tuning resistance points.

[0011] By adopting the above technical solution, cutting off the fine-tuning resistance points can achieve a higher-precision adjustment of the resistor.

[0012] Optionally, the terminal includes a terminal part and an annular connecting part, the annular connecting part is sleeved on the porcelain tube, and an insulating separator is provided on the inner surface of the annular connecting part, and the insulating separator is used to separate the annular connecting part from one of the two-strand resistance wires.

[0013] By adopting the above technical solution, the terminal is sleeved on the end of the porcelain tube through the annular connecting part, and only forms an electrical connection with one of the resistance wires by means of the insulating separator.

[0014] Optionally, the terminal parts of the two terminals are respectively located on both sides of the center line of the porcelain tube.

[0015] By adopting the above technical solution, the terminal parts of the two terminals are respectively arranged on both sides of the center line of the porcelain tube, which can make the two terminals stagger a larger distance to facilitate the connection of external wires.

[0016] Optionally, the terminal is a semi-ring structure, the two terminals enclose to form an annular structure and jointly surround the porcelain tube, the two terminals are connected by a fastener, and the two terminals are insulated from each other.

[0017] By adopting the above technical solution, the two semi-ring-structured terminals enclose to form an annular structure, which can save the material cost of the terminals compared with conventional terminals.

[0018] Optionally, a number of insulating separation points are connected between the two resistance wires, and the two resistance wires are connected through the insulating separation points and the coarse-tuning resistance points to form a strip structure.

[0019] By adopting the above technical solution, the insulating separation points and the coarse-tuning resistance points jointly connect the two resistance wires into a strip structure. During the process of winding the two-strand resistance wire around the outer wall of the porcelain tube, it is not easy for the two resistance wires to be twisted together, making the winding of the two-strand resistance wire more convenient.

[0020] Optionally, connecting pieces are respectively provided at both ends of the terminal, the connecting pieces of the two terminals are connected in one-to-one correspondence, and insulating gaskets are provided between the corresponding two connecting pieces.

[0021] By adopting the above technical solution, the insulating gasket can keep a reliable insulating state between the two terminal blocks.

[0022] Optionally, one of the two connecting pieces of the terminal block is a first connecting piece, and the other is a second connecting piece. The length of the first connecting piece is greater than that of the second connecting piece. The first connecting piece of one terminal block is connected to the second connecting piece of the other terminal block, and the first connecting piece is used for connecting a wire.

[0023] By adopting the above technical solution, the first connecting piece of the terminal block can not only serve as a connecting component for connecting another terminal block, but also serve as a connecting component for connecting the terminal block to an external wire, which is beneficial to simplifying the structure of the terminal block.

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

[0025] 1. Since the directions of the interaction magnetic fields generated by the two strands of the double-strand resistance wire are opposite and the magnitudes are similar, the influence of the interaction magnetic fields generated by the two strands of resistance wire on the current can be offset to a certain extent, which is beneficial to enabling the resistor to be better applicable to high-frequency voltage scenarios.

[0026] 2. By cutting off the coarse adjustment resistance point, the effective conductive length of the double-strand resistance wire can be changed, thereby realizing the adjustment of the voltage division ratio of the voltage dividing resistor, which is beneficial to improving the accuracy of voltage division. By cutting off the fine adjustment resistance point, a higher-precision adjustment of the resistor can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the high-precision high-voltage voltage dividing resistor of Embodiment 1.

[0028] Figure 2 is a schematic structural diagram of the high-precision high-voltage voltage dividing resistor of Embodiment 2.

[0029] Figure 3 is a side view of the high-precision high-voltage voltage dividing resistor of Embodiment 2.

[0030] Figure 4 is a schematic structural diagram of the high-precision high-voltage voltage dividing resistor of Embodiment 3.

[0031] DESCRIPTION OF THE REFERENCE NUMERALS:

[0032] 1, porcelain tube; 11, end cap; 2, double-strand resistance wire; 21, coarse adjustment resistance point; 22, connecting conductor; 23, fine adjustment resistance point; 24, insulating separation point; 3, terminal block; 31, annular connecting part; 32, terminal part; 33, connecting piece; 331, first connecting piece; 332, second connecting piece; 4, insulating separation piece; 5, insulating gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further elaborates on this application in conjunction with the attached Figures 1-4 drawings for a more detailed description.

[0034] Example 1

[0035] This application example discloses a high-precision high-voltage voltage-dividing resistor. Referring to Figure 1 , the high-precision high-voltage voltage-dividing resistor includes a porcelain tube 1, a double-strand resistance wire 2, and two terminal connectors 3. End caps 11 are respectively provided at both ends of the porcelain tube 1. The two terminal connectors 3 are located at the same end position of the porcelain tube 1. The double-strand resistance wire 2 has two strands of resistance wire, and the two strands of resistance wire are respectively connected to the two terminal connectors 3 in correspondence. The double-strand resistance wire 2 spirally extends along the outer wall of the porcelain tube 1 in a direction away from the terminal connectors 3 and is connected at the end.

[0036] Since the directions of the interaction magnetic fields generated by the two strands of resistance wire of the double-strand resistance wire 2 are opposite and the magnitudes are similar, the influence of the interaction magnetic fields generated by the two strands of resistance wire on the current can be offset to a certain extent, which is beneficial for the resistor to be better applicable to high-frequency voltage scenarios.

[0037] Multiple coarse adjustment resistance points 21 are provided at the part of the double-strand resistance wire 2 away from the terminal connectors 3. The coarse adjustment resistance points 21 are simultaneously connected to the two strands of resistance wire, and the coarse adjustment resistance points 21 are spaced along the extension path of the double-strand resistance wire 2. By cutting off the coarse adjustment resistance points 21, the effective conductive length of the double-strand resistance wire 2 can be changed to change the effective resistance value of the resistor and adjust the voltage division ratio.

[0038] One of the two strands of resistance wire is provided with a connection conductor 22. The connection conductor 22 is a resistance wire. The connection conductor 22 is connected to the terminal connector 3. Multiple fine adjustment resistance points 23 are provided between the connection conductor 22 and the resistance wire where it is located. The distance between the fine adjustment resistance points 23 is smaller than the distance between the coarse adjustment resistance points 21. By cutting off the fine adjustment resistance points 23, higher-precision adjustment of the resistor can be achieved.

[0039] The terminal connector 3 includes a terminal part 32 and an annular connection part 31. The terminal parts 32 of the two terminal connectors 3 are respectively located on both sides of the center line of the porcelain tube 1. The annular connection part 31 is sleeved on the porcelain tube 1. An insulating separator 4 is provided on the inner surface of the annular connection part 31. The insulating separator 4 is used to separate the annular connection part 31 from one of the strands of the double-strand resistance wire 2, so that the terminal connector 3 can be electrically connected to only one strand of resistance wire when the two strands of resistance wire pass through the terminal connector 3 simultaneously.

[0040] Example 2

[0041] Referring to Figure 2 and Figure 3, the terminal 3 in this embodiment is different from that in Embodiment 1. In this embodiment, the terminal 3 is a semi-circular structure. Two terminals 3 enclose to form a circular structure and jointly hold the porcelain tube 1 tightly. Connection pieces 33 are respectively arranged at both ends of the terminal 3, and the connection pieces 33 of the two terminals 3 are connected in one-to-one correspondence. An insulating gasket 5 is arranged between the corresponding two connection pieces 33 to insulate the two terminals 3 from each other. The two terminals 3 are connected by a fastener, and the fastener is a bolt and nut assembly.

[0042] The two semi-circular terminals 3 enclose to form a circular structure, which can save the material cost of the terminal 3 compared with the conventional terminal 3.

[0043] One of the two connection pieces 33 of the terminal 3 is the first connection piece 331, and the other is the second connection piece 332. The length of the first connection piece 331 is greater than that of the second connection piece 332; the first connection piece 331 of one terminal 3 is connected to the second connection piece 332 of the other terminal 3, and the first connection piece 331 is used to connect the wire.

[0044] The first connection piece 331 of the terminal 3 serves both as a connecting component for connecting the other terminal 3 and as a connecting component for connecting the terminal 3 to the external wire, which is beneficial to simplifying the structure of the terminal 3.

[0045] Embodiment 3

[0046] Refer to Figure 4 , in this embodiment, a number of insulating separation points 24 are also connected between the two resistance wires. The material of the insulating separation points 24 is resin material. The two resistance wires are connected by the insulating separation points 24 and the coarse adjustment resistance points 21 to form a strip structure, making it relatively convenient to wind the double-strand resistance wire 2 around the outer wall of the porcelain tube 1.

[0047] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A high-precision high-voltage voltage-dividing resistor, characterized in that: The invention comprises a porcelain tube (1), a double-strand resistance wire (2) and two wiring terminals (3), wherein the two wiring terminals (3) are located at the same end position of the porcelain tube (1), the double-strand resistance wire (2) has two strands of resistance wire, and the two strands of resistance wire are respectively connected to the two wiring terminals (3), and the double-strand resistance wire (2) spirally extends along the outer wall of the porcelain tube (1) in a direction away from the wiring terminals (3) and is connected at the ends.

2. A high-precision high-voltage voltage-dividing resistor according to claim 1, characterized in that: A plurality of coarse adjustment resistance points (21) are provided at a portion of the double-strand resistance wire (2) away from the wiring terminal (3), the coarse adjustment resistance points (21) are connected to two strands of resistance wire at the same time, and the coarse adjustment resistance points (21) are spaced apart along the extension path of the double-strand resistance wire (2).

3. A high-precision high-voltage voltage-dividing resistor according to claim 2, characterized in that: One of the two resistance wires is provided with a connecting conductor (22), the connecting conductor (22) is connected to the wiring terminal (3), a plurality of fine-adjustment resistance points (23) are provided between the connecting conductor (22) and the resistance wire, and the spacing between the fine-adjustment resistance points (23) is smaller than the spacing between the coarse-adjustment resistance points (21).

4. The high-precision high-voltage voltage-dividing resistor according to claim 1, characterized in that: The wiring terminal (3) comprises a terminal portion (32) and an annular connecting portion (31); the annular connecting portion (31) is sleeved on the porcelain tube (1); an insulating separator (4) is provided on the inner surface of the annular connecting portion (31); the insulating separator (4) is used to separate the annular connecting portion (31) from one of the two resistance wires (2).

5. A high-precision high-voltage voltage-dividing resistor according to claim 4, characterized in that: The terminal parts (32) of the two connection terminals (3) are respectively located on both sides of the center line of the porcelain tube (1).

6. The high-precision high-voltage voltage-dividing resistor according to claim 1, characterized in that: The connecting terminal (3) is a semi-ring structure. The two connecting terminals (3) are combined to form a ring structure and jointly surround the porcelain tube (1). The two connecting terminals (3) are connected by fasteners and are insulated from each other.

7. The high-precision high-voltage voltage-dividing resistor according to claim 2, characterized in that: A plurality of insulating separation points (24) are connected between the two resistance wires, and the two resistance wires are connected via the insulating separation points (24) and the coarse adjustment resistance points (21) to form a belt-shaped structure.

8. The high-precision high-voltage voltage-dividing resistor according to claim 7, characterized in that: Connecting pieces (33) are respectively provided at both ends of the wiring terminal (3); the connecting pieces (33) of the two wiring terminals (3) are connected one-to-one, and an insulating gasket (5) is provided between the two corresponding connecting pieces (33).

9. The high-precision high-voltage voltage-dividing resistor according to claim 8, characterized in that: One of the two connecting pieces (33) of the connecting terminal (3) is a first connecting piece (331), and the other is a second connecting piece (332); the length of the first connecting piece (331) is greater than that of the second connecting piece (332); the first connecting piece (331) of one connecting terminal (3) is connected to the second connecting piece (332) of the other connecting terminal (3), and the first connecting piece (331) is used to connect a wire.

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