CN85205292U - Bifunctional pyroelectric safety box - Google Patents

Abstract

The utility model discloses a bi-functional pyroelectric safety box, belonging to the field of the protection devices of electrical equipment, comprising a ceramic box body [1], an alloy fuse link [2], a copper pin out [3], an elastic strip [4], a mica sheet [5], and a metal heating plate, wherein, the alloy fuse link is made from the metallic material of Bi, Cd, Pb, and Sn. When the recipes of alloys are different, different fusing points can be obtains. When temperature rise exceeds the fusing points of the alloys, or electric currents exceed the limit values of the section of the fuse link, the alloys can automatically fuse, and the currents can be cut. The bi-functional pyroelectric safety box can be used for overfire and overflowing protections in various electrical equipment.

Description

Bifunctional pyroelectric safety box

Electric equipment protective device field under the difunctional thermoelectric safety box.

Universal day by day along with household appliances, when employed control appliances such as electric rice cooker, electric frying pan, electric heater break down, all may temperature rise too high and burning apparatus also will cause fire when serious.Wait the overcurrent that prevents electric equipment and overheated though fusible link or thermal relay are housed in general electrical installation, all belong to and utilize the heating effect of current principle to make.Many electric equipment products are because the malfunctioning operating current of control switch is still located normal condition, and above-mentioned protective device just loses function.Equipment is subjected to persistent fever and damages, even causes fire.When the temperature detect switch (TDS) in the example electric rice cooker was malfunctioning, if can not cut off the electricity supply, its operating current can not increase, and when opening as sky, only needed more than ten minute just with the fusing of the aluminium sheet in the pot for cooking rice, very easily caused fire.In cause of fire in the winter nineteen eighty-three statistical form of Shanghai City, the breaking out of fire of installing and using security regulations because of violation electrical equipment has 42 times, the fire that takes place of violating safe operation rules has (Science and Technology of Shanghai newspaper on November 23rd, 1985) 28 times, and fire is also caused by the out of control of electric equipment mostly abroad.

Characteristics of the present utility model are after adopting the difunctional thermoelectric safety box of corresponding specification, no matter to be electric current value of overstepping the extreme limit of electrical equipment; Or all can cut off the electricity supply immediately during the temperature rise value of overstepping the extreme limit, the accident that prevents takes place.The temperature rise that utilizes the alloy melting point control appliance is the disadvantage that has overcome fuse and thermal relay.

Difunctional thermoelectric safety box (Fig. 1) is that (Fig. 2) the thinner sheet fuse link (2) in the alloy material centre of making is (Fig. 3) by the ceramic box body (1) of one one end opening, metal leading foot (3) (Fig. 4), two end perforates become (L) shape, one end and external circuit join, the other end and fuse link join, and can be fixed on the porcelain box by screw.Flexure strip (4) (Fig. 5) makes fuse link (Fig. 6) keep well contacting with mica paper (5), and makes flexure strip center and fuse link center close proximity, obtains good heat transmission.Metal heated plate (6) (Fig. 7) has circular hole in two ends, uses for being installed on the heater, and four jiaos have four rectangular can being made of one with ceramic box.At first want during use clear and definite controlled electric limiting current and and maximum temperature-rise, match suitable safety box, the box leading foot is serially connected in the circuit, make heated sheet nestle up heater, when the electric current of electric equipment surpasses fuse link cross section limiting value, make the fuse link fusing by the thermal effect of electric current.When the equipment temperature rise surpasses alloy melting point, under heat transfer process, the fusing of alloy fuse link is also promptly cut off the electricity supply.Alloy after the fusing concentrates in the safety box, avoids running off causing accident outside.

Select the alloy material of different formulations, just obtain various fusing point.For example: the alloy that Cd18%, Pb32%, Sn50% proportioning become, its fusing point be at 124 ℃, if fusing point can also descend when wherein increasing metal Bi again.Make the different fuse link of sectional area with a kind of alloy material, i.e. the electric current of the different sizes of may command.Thereby can make series of products, be widely used among household electrical appliance, industrial electrical equipment equipment, electric power system and the power supply.

Claims (2)

1, a kind of fusing point that utilizes alloy material safety box that the electric current and the temperature of electric equipment are protected.It is characterized in that this device is made up of ceramic box, alloy fuse link, leading foot, flexure strip, mica sheet, metal heated plate.

2, safety box according to claim 1 is characterized in that the alloy fuse link made by Bi, Cd, four kinds of metal materials of Pb, Sn.

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