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Circuit breaker and thermal trip

A tripping device and thermal technology, applied in the field of thermal tripping devices, can solve the problems of bending of bimetals, change of tripping characteristics, etc.

Inactive Publication Date: 2008-03-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that when measuring with a contact thermometer, pressure is applied to the bimetal strip from the outside through the measuring piece, so the bimetal strip is bent and the tripping characteristics are changed.

Method used

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  • Circuit breaker and thermal trip
  • Circuit breaker and thermal trip
  • Circuit breaker and thermal trip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. Fig. 1 is a side view showing the internal mechanism of a circuit breaker having a thermal trip device, Fig. 2 is an enlarged perspective view of the thermal trip device of Fig. 1, and Fig. 3 is an enlarged view of the thermal switch of Fig. 1 A side view of a type tripping device. Fig. 4 is a perspective view for explaining the method of measuring the temperature of the bimetallic strip by a contact temperature measuring device. Fig. 5 is a perspective view for explaining the bimetallic strip when the fixed terminal (ie, the heater) is energized. An enlarged side view of the bending action. In addition, in FIGS. 1 to 5, the same parts are denoted by the same reference numerals.

[0027] In FIG. 1, the operation when an overcurrent greater than or equal to the rated current flows through the circuit breaker is as follows.

[0028] (1) The temperature of the heater 1 or the b...

Embodiment approach 2

[0047] Hereinafter, Embodiment 2 of the present invention will be described with reference to FIGS. 6 to 8. Fig. 6 is a perspective view showing the thermal trip device, Fig. 7 is a side view of the thermal trip device, and Fig. 8 is an enlarged side view for explaining the bending action of the bimetallic strip when the fixed terminal (ie, the heater) is energized .

[0048] The second embodiment of the present invention, as shown in FIGS. 6 to 8, is a case where the temperature measuring member 7 extends from the fixed end 221 of the bimetal 2 to the side opposite to the operating end 21 of the bimetal 2 example of.

[0049] In this case, the temperature measuring member 7 is formed by extending the bimetal 2 itself to the side opposite to the operating end 21. In other words, the temperature measuring member 7 is in a state exposed from the bimetal 2 and the fixed terminal (that is, the heater) 1 and is integrally fastened with the bimetal 2 to the fixed terminal (that is, the ...

Embodiment approach 3

[0053] In the third embodiment of the present invention, as shown in FIG. 9, the fixed terminal 1 is provided with a measuring element larger than the measuring element 81 of the contact type temperature measuring device 8 and inserted into the through hole 12a, and the measuring element is inserted into the through hole 12a. The measuring piece 81 is inserted into the through hole 12a so that it does not come into contact with the fixed terminal (ie, the heater) 1, and the tip of the measuring piece 81 abuts against the lower surface of the temperature measuring member 7 to measure the temperature. The temperature of the component 7 is indirectly measured for the temperature of the bimetallic strip 2. With this configuration, it is possible to achieve the same effect as the above-mentioned Embodiment 2 of the present invention.

[0054] In addition, in Embodiment 3 of the present invention, specifically, as shown in the figure, the above-mentioned measuring tool insertion through...

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Abstract

A thermal tripping device, on a heater (1) as a fixed terminal, a bimetal strip (2) with one end as an action end (21) and the other end as a fixed end (22) The above-mentioned fixed end (22) is fastened to the above-mentioned heater (1) in a cantilever shape, and when the above-mentioned heater (1) is overheated by energizing the above-mentioned heater (1), the above-mentioned moving end of the above-mentioned bimetal (2) (21) Bending, and on the fastening part (221) where the above-mentioned bimetal strip is fastened to the above-mentioned heater, integrally and directly bond the temperature measuring member (7), which is obtained from the above-mentioned bimetal strip (2) and the above-mentioned heater (1) are exposed so as to be in contact with the contact temperature measuring device (8).

Description

Technical field [0001] The present invention relates to a circuit breaker, which has a thermal trip device. The thermal trip device is a bimetal with one end as an operating end and the other end as a fixed end. The fixed end portion is fastened to the fixed terminal in a cantilever shape, and the operation end portion causes the circuit breaker main body to perform a tripping operation by using the bending of the bimetallic sheet overheated by the overcurrent flowing through the fixed terminal; The present invention also relates to a thermal trip device in which the fixed end of the bimetal with one end as the operating end and the other end as the fixed end is in a cantilever shape on a heater that becomes a fixed terminal. It is fastened to the heater, and if the heater overheats due to energization, the operating end of the bimetallic piece is bent. Background technique [0002] The thermal tripping device is, for example, a device that detects overcurrent in a circuit breake...

Claims

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Application Information

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IPC IPC(8): H01H73/22H01H61/00
CPCH01H71/164H01H69/01H01H2011/0068
Inventor 村井正俊川村浩司内藤悟
Owner MITSUBISHI ELECTRIC CORP
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