CN2185864Y

CN2185864Y - Fully automatic water heater

Info

Publication number: CN2185864Y
Application number: CN 93242313
Authority: CN
Inventors: 王昆茂
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-03
Filing date: 1993-11-03
Publication date: 1994-12-21
Anticipated expiration: 2003-11-03

Abstract

The utility model relates to a heating appliance. The fully automatic water heater is characterized in that a heating element and a temperature control switch are made of conducting ceramic material (PTC); at the same time both ends of a circulating water pipe of the fully automatic water heater are connected with an intake water pipe and an outlet water pipe by insulation materials, forming insulation; an insulation layer is painted on the inner layer surface of the circulating water pipe; the circulating water pipe is used as an electrode. The utility model has the advantages that heating element and the temperature-control switch are made into a body without contact point; the fully automatic water heater is almost faultless; the production is easy.

Description

Fully automatic water heater

The utility model relates to a kind of electric heating appliance, particularly electric heater.

The prior art electric heater, the bimetal leafs of using of temperature control part more, the temperature spot of bimetal leaf is not very stable usually, and the contact frequent movement, because the power of water heater is bigger, so the electric current of contact break-make is bigger, the contact often burns out.

The purpose of this utility model provides a kind of accurately temperature control, can contactlessly cut off the power supply again, makes its life-span longer.

The technical solution of the utility model is to utilize the temperature variant characteristic of resistance of conducting ceramic material (being commonly called as PTC, the following general designation of this specification PTC), on manufacturing process PTC make temperature when low impedance low, when temperature rises to a certain critical-temperature T _LThe time, impedance rises suddenly.As long as this PTC is rolled on the circulating water pipe, when flowing through water pipe, connects in water power supply, and when low temperature, the PTC impedance is little, and the electric current that then flows through is big, and the PTC heating is absorbed by water, surpasses critical-temperature T when water temperature rises _L, then the impedance of PTC is very big, almost is provided with electric current and flows through, then can constant temperature.Being that PTC is a heater, is again contactless temperature detect switch (TDS).

Further specify the utility model below by accompanying drawing:

Fig. 1 is a PTC resistance/temperature characteristic curve;

Fig. 2 is a schematic diagram of the present utility model;

Fig. 3 is the A-A cutaway view of band PTC water pipe;

Fig. 4 implements illustration.

In the accompanying drawing, circulating water pipe 1, ptc material 2, insulating barrier 3, insulation tube 4, PTC connection jaws 5, power switch 6, water pipe electric wire connecting junction 7.From Fig. 2, see, wrapping up in the ptc material 2 more than a section on the circulating water pipe 1, these water pipe 1 two ends are joined by insulation tube 4 and other water pipe sections, and water pipe 1 internal layer scribbles insulating barrier 3, connection jaws 5 is arranged by power switch 6 on every section ptc material, connect a wherein phase line, and the connection jaws 7 on circulating water pipe 1 connects another phase line.

The course of work of the present utility model is such: fashionable as current, connect power switch, because temperature is lower, therefore the resistance of ptc material is very little, then has big electric current to flow through PTC, makes it heating, water absorbs the heat that PTC sends simultaneously, and temperature rise is when temperature rises to critical-temperature T _LThe time, the resistance of PTC rises, and almost no current flows through, and PTC no longer generates heat.If temperature decline subcritical temperature, then PTC switches on again, generates heat, and permanent water temperature is in critical-temperature.

The utility model has the advantages that heating and the same one of temperature detect switch (TDS), and switch is contactless, makes the water heater almost fault-free that becomes, and makes simple.

Accompanying drawing 3 is seen in enforcement of the present utility model, to note in force following some: 1, be wrapped with the water pipe section of ptc material, use copper pipe; 2, external and water outlet pipeline section must ground connection, guarantees safety; 3, use flow control switch, promptly there is water to flow through just energising in the water pipe.

Claims

1, a kind of full-automatic water heater is characterized in that: be wrapped with conducting ceramic material on the circulating water pipe of water heater.

2, full-automatic water heater according to claim 1, it is characterized in that: there is fracture at the circulating water pipe two ends of water heater, and by insulating materials fracture is connected, conducting ceramic material and circulating water pipe connect AC power respectively, and the pipe internal surface of circulating water pipe has insulating barrier.