WO2019039122A1

WO2019039122A1 - Resistor

Info

Publication number: WO2019039122A1
Application number: PCT/JP2018/026184
Authority: WO
Inventors: 章吉村
Original assignee: Koa株式会社
Priority date: 2017-08-21
Filing date: 2018-07-11
Publication date: 2019-02-28
Also published as: DE112018004738T5; CN110998755B; JP6938274B2; CN110998755A; JP2019036673A

Abstract

Provided is a three-terminal-type resistor having excellent stability and reliability. The invention comprises a first resistor (21), a second resistor (22), and an intermediate terminal (23) to which the first and second resistors (21, 22) are coupled. The intermediate terminal (23) comprises a first gripping section (23a) and a second gripping section (23b) gripping the first and second resistors (21, 22) along the same straight line extending in the axis directions of the resistors. The first and second resistors (21, 22) are gripped between the first gripping section (23a) and the second gripping section (23b) with a gap (S) therebetween.

Description

Resistor

The present invention relates to a resistor, and more particularly to a three-terminal resistor having an intermediate terminal at the center in addition to the terminals at both ends of the resistor.

Conventionally, a three-terminal type resistor in which a metal oxide film resistor having a metal oxide film resistor disposed on a winding resistor or a ceramic core having a winding formed on a glass core or a ceramic core is sealed in a cement case or the like. It has been known. According to the resistor, a large power capacity can be obtained with flame resistance, and in particular, a pulse / inrush current prevention function is excellent, and a resistor suitable for use as, for example, a balance resistor of a capacitor can be obtained.

An example of such a conventional three-terminal resistor is shown in FIG. A winding 12 is wound on one core member 11,

terminals

13 and 14 are provided at both ends, and an intermediate terminal 15 is provided at the center of the terminals 13 and 14 (JP-A-49-78154). reference).

In addition, one core material is divided into two core materials, they are arranged to abut, and there are some which arranged winding separately to two core materials and were made to obtain separate resistance value. . There is also known a three-terminal type resistor in which end faces of two cap-attached winding resistors are butt-welded and welded, and terminals are fixed to the caps (see Japanese Patent Laid-Open No. 2010-221483).

In the conventional three-terminal resistor having a relatively long axial length, the degree of thermal expansion / contraction varies along the axial direction of the resistor, and the stability / reliability of the resistor by long-term use There was a problem that a problem occurred in

The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to provide a three-terminal type resistor excellent in stability and reliability.

A three-terminal resistor according to the present invention comprises a first resistor, a second resistor, and an intermediate terminal connecting the first and second resistors, the intermediate terminal comprising the first and second resistors. The first and second grips are provided for holding the second resistor linearly in the axial direction, and the first and second resistors include the first and second grips. It is characterized in that it is gripped at an interval between the grips of. It is preferable that the said space | interval was formed by the slit.

According to the present invention, the first resistor and the second resistor are spaced apart between the gripping portions of the first resistor and the second resistor that constitute the three-terminal resistor. As it is gripped, the first resistor and the second resistor are independent of each other. Thereby, in the three-terminal resistor having a relatively long axial length, the first resistor and the second resistor can be obtained even if the degree of thermal expansion and contraction differ along the axial direction of the resistor. Can expand and contract independently. Therefore, the problem that the problem of the stability and reliability of the resistor is caused by long-term use is solved, and it becomes possible to provide a three-terminal type resistor excellent in stability and reliability.

It is a front view of the three-terminal type resistor of one example of the present invention. (A) which shows one structural example of an intermediate terminal is a front view, (b) is a side view. (A) of the three-terminal resistor according to another embodiment of the present invention is a front view, (b) is a cross-sectional view taken along line AA ', and (c) is a cross-section taken along line BB' FIG. It is a side view which shows the other structural example of a terminal, (a) is an example which provided the level | step difference between a holding part and a connection part, (b) is an example which provided the twist between a holding part and a connection part. It is. It is a front view of the conventional three terminal type resistor.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. In the drawings, the same or corresponding members or elements will be described with the same reference numerals.

FIG. 1 shows a three-terminal resistor according to an embodiment of the present invention, and FIG. 2 shows a structural example of an intermediate terminal. As shown in FIG. 1, the resistor of the present invention comprises a first resistor 21 and a second resistor 22 and an intermediate terminal 23 connecting the first and second resistors. The first resistor 21 and the second resistor 22 may be, for example, a winding resistor having a winding formed on a glass core or a ceramic core, or a metal oxide film resistor having a metal oxide film disposed on a ceramic core. Used.

The other ends of the intermediate terminals 23 of the first resistor 21 and the second resistor 22 are respectively connected to the

terminals

24 and 25 to form a three-terminal resistor as a whole. There is. The resistor is sealed in a cement container or the like, and is used as a resistor which is flame-retardant and can obtain a large power capacity, and is particularly excellent in a pulse / rush current prevention function.

The intermediate terminal 23 includes a first grip 23a and a second grip 23b for holding the first resistor 21 and the second resistor 22 linearly in the axial direction, respectively. The

resistors

21 and 22 are gripped at an interval S between the first grip 23a and the second grip 23b. In this embodiment, the intermediate terminal 23 is provided with a slit S between the first gripping portion 23a and the second gripping portion 23b, and the space S is formed by the slit S.

The intermediate terminal 23 includes a common connection portion 23c extended from the first grip portion 23a and the second grip portion 23b. And, the

terminals

24 and 25 also have gripping

portions

24a and 25b for gripping the end opposite to the middle terminal 23 of the first resistor 21 and the second resistor 22, and the connecting

portions

24c and 24c extended from the gripping portions. It has 25c. The

connection parts

23c, 24c, and 25c are used by being connected to the circuit at the time of mounting.

According to the three-terminal type resistor, the first portion between the

gripping portions

23a and 23b of the middle terminal 23 of the first resistor 21 and the second terminal 22 constituting the three-terminal type resistor can be used. Since the resistor and the second resistor are grasped by opening the gap (slit S) by the intermediate terminal 23, the first resistor 21 and the second resistor 22 are independent of each other.

Therefore, the stability and reliability of the three-terminal resistor can be enhanced with respect to thermal expansion and thermal contraction of the cement case. For example, in the case where the first resistor 21 expands due to heat generation, and the second resistor 22 does not generate heat and remains contracted, the first resistor is separated by an interval between the

grip portions

23a and 23b. The thermal expansion of the first resistor 21 does not affect the second resistor 22 because the second resistor 22 and the second resistor 22 are gripped.

Thereby, in the three-terminal resistor having a relatively long axial length, the first resistor and the second resistor can be obtained even if the degree of thermal expansion and contraction differ along the axial direction of the resistor. Can expand and contract independently. Therefore, although the problem of the stability and the reliability of the resistor has conventionally been caused by the long-term use, the first resistor 21 and the second resistor 22 are separated by an interval between the

gripping portions

23a and 23b. By being held, such a problem is solved.

By arranging the slit S at the center of the three-terminal resistor, the first resistor 21 and the second resistor 22 can be mounted in a well-balanced manner when mounted on a cement container. That is, a partition plate is provided at the center of the cement container, and by fitting the slit S back to the partition plate, the three-terminal resistor can be easily mounted on the cement case in a well-balanced manner.

The intermediate terminal 23 is formed by forming a metal film (for example, Sn plating) on a base material of a thin single plate-like metal, for example, a metal such as Fe or Cu. In the present embodiment, the thickness of the metal plate is suitably about 0.5 mm. The inner diameter of the ring-

like holding parts

23a and 23b for holding the axial ends of the

resistors

21 and 22 can be fitted, for example, when holding a resistor having a diameter of 4.0 mm, and the diameter is permanently 4 It is set to a size that can obtain a spring force capable of gripping a 0 mm resistor.

For example, as for the axial direction length of ring-

shaped holding parts

23a and 23b holding a resistor with a diameter of 4.0 mm, about 3.5 mm is appropriate. The distance between the ring-

shaped grips

23a and 23b, that is, the axial length of the slit S is preferably about 1 mm, and the depth of the slit S is preferably about 7 mm. As a result, the thermal expansion and contraction of the resistor which repeats thermal expansion and contraction in the axial direction is absorbed by the elasticity of the metal plate, and the two

resistors

21 and 22 are spaced apart and gripped without interference with each other. .

Further, although the intermediate terminal 23 includes the connection portion 23c extended from the ring-

shaped grip portions

23a and 23b, the distance from the

grip portions

23a and 23b to the connection portion 23c, that is, the height of the intermediate terminal 23 is attached It should be decided according to the specifications of the cement container etc.

FIG. 3 shows a three-terminal resistor according to another embodiment of the present invention. In this embodiment, the intermediate terminal 23 and the

terminals

24 and 25 are formed by forming the embossed O by press processing as shown in FIGS. 3 (b) and 3 (c). Thus, the strength of the intermediate terminal 23 and the

terminals

24 and 25 is improved against bending stress.

FIG. 4 shows a modification of the intermediate terminal 23 and the

terminals

24 and 25 shown in FIG. (A) is the example which formed the level | step difference in the middle of an intermediate | middle terminal and a terminal. (B) is an example in which a twist for twisting the

connection portions

23c, 24c, 25c by 90 ° is formed in the middle of the intermediate terminal and the terminal. It is possible to appropriately adopt these processes in accordance with various mounting forms.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-described embodiment, and may be implemented in various different forms within the scope of the technical idea thereof.

INDUSTRIAL APPLICABILITY The present invention is suitably applicable to a three-terminal type resistor provided with an intermediate terminal at the center, in addition to the terminals at both ends of the resistor, which are used for cement resistors and the like.

Claims

A first resistor, a second resistor, and an intermediate terminal connecting the first and second resistors;
The intermediate terminal includes a first gripping portion and a second gripping portion that linearly grip the first and second resistors in the axial direction,
The first and second resistors are three-terminal resistors held at an interval between the first grip and the second grip.
The three-terminal resistor according to claim 1, wherein the distance is formed by a slit.
The three-terminal resistor according to claim 1, wherein the intermediate terminal includes a connection portion extended from the first grip portion and the second grip portion.
The three-terminal resistor according to claim 1, wherein the intermediate terminal is made of a thin single plate metal.