Method for manufacturing normally-open temperature-sensitive magnetic control switch

Abstract

The invention discloses a method for manufacturing a normally-open temperature-sensitive magnetic control switch. The normally-open temperature-sensitive magnetic control switch is composed of a reed pipe (1), a permanent-magnet magnetic ring (2), and a temperature-sensitive soft-magnet magnetic ring (3), wherein the permanent-magnet magnetic ring (2) is sleeved at the centre of the reed pipe (1), and the temperature-sensitive soft-magnet magnetic ring (3) is sleeved on the periphery of the permanent-magnet magnetic ring (2). The height (the length along the length direction of the reed pipe) of the temperature-sensitive soft-magnet magnetic ring (3) is greater than that of the permanent-magnet magnetic ring (2). An annular gap formed between the temperature-sensitive soft-magnet magnetic ring (3) and the reed pipe (1) is encapsulated (4) by epoxy resin doped with temperature-sensitive soft-magnet powder. Therefore, the magnetic flux leakage between the permanent-magnet magnetic ring (2) and the temperature-sensitive soft-magnet magnetic ring (3) can be reduced, thereby increasing the lagged temperature and action temperature precisions of the temperature-sensitive magnetic control switch. The temperature-sensitive magnetic control switch only needs two components except the reed pipe, saves three components compared with the traditional normally-open temperature-sensitive magnetic control switch, and is compact in structure, so that miniaturization is easier to realize.

Description

technical field [0001] The invention relates to a temperature control switch, in particular to a method for manufacturing a normally open temperature-sensitive magnetic control switch. Background technique [0002] Commonly used temperature control switches include thermistors, bimetal strips and temperature-sensitive magnetic switches. Since the action precision of the temperature-sensitive magnetic control switch is much higher than that of the bimetal strip, in addition, compared with the thermistor, the temperature-sensitive magnetic control switch itself has a switching action function, and the structure is simple and reliable. Therefore, temperature-sensitive magnetic switches are being used more and more widely in the fields of automobiles, office equipment, and household appliances. [0003] The temperature-sensitive magnetic switch is usually composed of a reed switch, a soft magnetic ring, a permanent magnetic ring, etc. Its working principle is to design the Curi...

AI Technical Summary

Problems solved by technology

[0006] For these two methods, to form a normally open temperature-sensitive magnetic control switch, 5 parts are required in addition to the reed switch. Due to the large number of parts, it is not conducive to miniaturization. Therefore, the normal size of the normally open temperature-sensitive magnetic control switch is bigger

In addition, the hysteresis temperature of the existing temperature control switch composed of the above two methods is usually ≤7°C, and the highest accuracy can only reach 1°C; the operating temperature accuracy is usually ≤±3.5°C, and the highest accuracy can only reach ±1°C , and the greater the rated current, the worse the operating temperature accuracy

Therefore, the hysteresis temperature and action temperature accuracy of the existing temperature control switch can not reach the level of ≤0.5°C

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