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Circuit breaker and thermal trip

A tripping device, thermal technology, applied in the field of thermal tripping devices, can solve problems such as bending of bimetal strips and changes in tripping characteristics

Inactive Publication Date: 2010-06-16
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] The following pass Figure 1 to Figure 5 Embodiment 1 of the present invention will be described. figure 1 It is a side view showing the internal mechanism part of the case of a circuit breaker with a thermal tripping device, figure 2 is enlarged figure 1 Oblique view of the thermal tripping device, image 3 is enlarged figure 1 Side view of the thermal trip unit, Figure 4 It is a perspective view for explaining the method of measuring the temperature of a bimetallic strip with a contact thermometer, Figure 5 It is an enlarged side view for explaining the bending action of the bimetal when the fixed terminal (that is, the heater) is energized. also, Figure 1 to Figure 5 In , the same symbols are assigned to the same parts.

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

[0028] (1) The temperature of the heater 1 or the bimetal 2 rises due to an overc...

Embodiment approach 2

[0047] Below, through Figure 6 ~ Figure 8 Embodiment 2 of the present invention will be described. Figure 6 It is an oblique view showing the thermal tripping device, Figure 7 is a side view of the thermal trip unit, Figure 8 It is an enlarged side view for explaining the bending action of the bimetal when the fixed terminal (that is, the heater) is energized.

[0048] Embodiment 2 of the present invention is as Figure 6 ~ Figure 8 Shown is an example of a case where the temperature measuring member 7 extends from the fixed end portion 221 of the bimetal strip 2 to the side opposite to the operating end portion 21 of the bimetal strip.

[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 integrally fastened to the fixed terminal (ie, the heater) 1 with the above-mentioned bimetallic piece 2 in a state exposed from the ab...

Embodiment approach 3

[0053] In Embodiment 3 of the present invention, as Figure 9 As shown, a measuring piece insertion through hole 12a having a larger diameter than the measuring piece 81 of the contact temperature measuring device 8 is provided on the fixed terminal 1, and the measuring piece 81 is inserted into the measuring piece insertion through hole 12a to Make it will not be in contact with the above-mentioned fixed terminal (ie, the heater) 1, and measure the temperature of the temperature measuring member 7 by the front end of the above-mentioned measuring piece 81 abutting against the lower surface of the above-mentioned temperature measuring member 7, and measure the temperature of the bimetal 2 indirectly. temperature. With such a configuration, the same effect as that of the second embodiment of the present invention can be achieved.

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

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PUM

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Abstract

A thermal trip comprises a bimetal (2) having one acting end (21) and the other cantilevered fixed end (22) secured to a heater (1) serving as a fixed terminal. The acting end (21) of the bimetal (2)bends as the bimetal is heated when the heater (1) is electrified. The thermal trip is characterized in that a temperature measuring member (7) is coupled integrally with the secured portion (221) ofthe bimetal (2) secured to the heater (1) and exposed from the bimetal (2) and the heater (1) so that the temperature measuring member (7) can touch a contact temperature sensor (8).

Description

technical field [0001] The present invention relates to a circuit breaker, the circuit breaker has a thermal tripping device, and the thermal tripping device is a bimetal whose one end is an operating end and the other end is a fixed end. The above-mentioned fixed end portion is fastened to the fixed terminal in a cantilever shape, and the above-mentioned operating end portion makes the main body of the circuit breaker perform a tripping operation by utilizing the bending of the above-mentioned bimetal strip overheated by the overcurrent flowing through the above-mentioned fixed terminal; The present invention also relates to a thermal tripping device, in which on a heating element that becomes a fixed terminal, the above-mentioned fixed end of a bimetal strip whose one end is an operating end and the other end is a fixed end is arranged in a cantilever shape. Fastened to the above-mentioned heater, if the above-mentioned heater is overheated due to energization, the above-men...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H73/22H01H61/00
CPCH01H2011/0068H01H69/01H01H71/164
Inventor 村井正俊川村浩司内藤悟
Owner MITSUBISHI ELECTRIC CORP
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