Overload protection device, electric compressor and refrigerating air-conditioner apparatus

Abstract

The existing porblems of prior overload protecting device are as follows: the metal of the fusion device melts or evaporate by electric energy or others, then diffuses into the container, and the generation of an arc leads to large-scale current in the motor of compressor,thereby the compressor may be burned-out and damaged. This is the overload-protecting device provide with the first heat-reacting device 9 for overload current protection to make a movable contact point 9b move by deformation due to the temperature of the heat-reacting plate 9c and to have a fixed contact point 9f paired with its movable contact point 9b, with the current fuse means 10 to carry out interruption of the current by fusing due to its self-oxoterm by the current, and with a housing container 7 to wire-connect and to house the heat-reacting device 9 and the current fuse means 10 in a series circuit, and this is made to be constituted, so that a shielding member 12 is installed to separate a space at which the current fuse means 10 is installed from a space at which the first heat-reacting device 9 is installed.

Description

Technical field [0001] The present invention relates to an overload protection device, an electric compressor and a refrigerating and air-conditioning device, in particular to an overload protection device using a heat-sensitive moving body, an electric compressor and a refrigerating and air-conditioning device using such an overload protection device. Background technique [0002] Figure 26 This is, for example, a longitudinal sectional view of a conventional overload protection device disclosed in Japanese Patent Application Laid-Open No. 64-2232. Figure 27 Yes Figure 26 Sectional view of VI-VI. As shown in the figure, in the conventional overload protection device, in the space of the container 7 enclosed by the container 7a and the cover 7b made of heat-resistant insulating material such as synthetic resin, it is fixed to the bottom surface 7c of the container 7 by penetrating The shaft 9a is reversibly supported by a disc-shaped heat-sensitive moving plate 9c. A movable ...

AI Technical Summary

Problems solved by technology

[0012] However, after the above-mentioned thermal induction motion plate 9c recovers, if the above-mentioned abnormality is not normalized and the abnormality continues, the thermal induction motion plate 9c repeatedly operates and recovers, and finally the thermal induction motion plate 9c is fatigued and damaged, resulting in a movable The contact 9b is welded to each fixed contact 9f

This kind of contact welding will cause the compressor motor 1c to continue to be in a state where a large current is energized, and the motor coil will continue to heat up, resulting in damage to the coil covering part or insulating material. Therefore, some coils are in contact with each other without covering parts. State, increasing the conductor area, reducing the coil resistance, further leading to an increase in current

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