CN2074523U

CN2074523U - Heating appliance with positive temperature coefficient

Info

Publication number: CN2074523U
Application number: CN 90203064
Authority: CN
Inventors: 张崇泰
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-03-15
Filing date: 1990-03-15
Publication date: 1991-04-03

Abstract

The utility model relates to a heating appliance with positive temperature coefficient (PTC), comprising two conductive frames whose each frame is provided with a plurality of frame mouths with a plurality of frame mouths which are mutually corresponding, and a plurality of PTC heating resistance bodies which are respectively arranged between two conductive frames and are positioned at the frame mouths, as a honeycomb type. The utility model is characterized in that the circumference of each frame mouth of two conductive frames is provided with a meshed frame web and the conductive frames and the PTC heating resistance bodies are provided with elastic plate pieces to conduct the heat produced by the PTC heating resistance to the frame webs. And then the heat-conducting surface and the heat-distributing coefficient are increased to improve efficiency and tighten the combination of each component.

Description

Heating appliance with positive temperature coefficient

The utility model relates to a kind of positive temperature coefficient (PTC) heating element, refers to a kind of heating efficiency that improves each PTC thermal resistor especially, and each assembly is in the structure better than single PTC heater of the tight effect between after the combination.

The structure of known PTC heater, on the whole the PTC thermal resistor group that is combined for one or more PTC thermal resistor adds supply voltage respectively at its two ends, makes the heating of PTC thermal resistor.Generally, after the PTC thermal resistor was subjected to applied voltage, promptly because of power supply passes through to begin consumed energy, the voltage of being imported, electric current (V.I) were consumed by the temperature rising of PTC itself and the heat radiation of PTC, and its balanced type is as follows:

Pdt＝VIdt＝HdT＋D（T－T ₂）dt

In the formula:

D is coefficient of heat transfer (W/K),

P is a thermoelectric (al) power,

V is a voltage,

I is an electric current,

H is a thermal capacity,

T is a thermal resistance part surface temperature,

Td is an ambient temperature.

By in the formula as can be known, when this coefficient of heat transfer increases, resulting Pdt(energy) also increase thereupon.For the structure of known PTC heater, the structure design that increases coefficient of heat transfer is not also arranged itself, for heating efficiency, the enhancement part is not arranged.And general PTC heater all has a plurality of assemblies, and regular meeting is influenced by heating, expanding with heat and contract with cold of cooling when combination, and the time one is of a specified duration, and the close relation of inter-module just can be relaxation.

Main purpose of the present utility model is to provide a kind of coefficient of heat transfer that increases to improve the PTC heater of PTC heater energy for overcoming above-mentioned shortcoming.

Another purpose of the present utility model provides the PTC heater that a kind of combination that makes inter-module keeps tight effect.

The positive temperature coefficient that the utility model proposes (PTC) heating element comprises: two conductive frames, each framework all are provided with several frame mouths, and the frame mouth of two frameworks is corresponding all mutually; Several PTC thermal resistors are installed between two conductive frames respectively and are located in frame mouth place, and its structure can be cellular.Its improvement is that all sides of each frame mouth of this two conductive frame all are provided with netted frame net, make heat that each PTC thermal resistor produced except that auto-radiating own, the frame that still can conduct to periphery is online, and the conducting surface of heat is increased to increase coefficient of heat transfer, improves the heat efficiency.

Can be provided with elastic board chip between this conductive frame and PTC thermal resistor, each frame mouth of the corresponding conductive frame of this elastic board chip, and frame net position all is provided with notch, and the inwall of notch is stretched flexible to PTC thermal resistor pleurapophysis, the flexure strip of this elastic board chip can brute force prop up the PTC thermal resistor when making combination, makes combination tightr.

It is wave meander-like up and down that this elastic board chip also can be the rib that separates into notch, makes it have elasticity.

Exemplify a preferred embodiment below, the present invention will be described in detail in conjunction with the accompanying drawings:

Fig. 1 is the structure decomposition map of embodiment of the present utility model;

Fig. 2 is the tectonic association figure of embodiment of the present utility model;

Fig. 3 is the structural map of an elastic board chip among the embodiment of the present utility model.

See also exploded view and the constitutional diagram of Fig. 1, the utility model embodiment shown in Figure 2.Wherein:

Two insulation boards 10, can make (as P.P.S. poly-sulfuration dimethylbenzene or plastic cement materials such as P.A. Ju Hai amine or P.O.N. polyacetals) by heat-resisting plastic cement material, the middle part has several two insulation boards, 10 corresponding air outlets, and two insulation boards 10 inboard corresponding all air outlets 11 positions in opposite directions have the groove of accepting 12;

Two conductive frames 20, what be separately fixed at an insulation board 10 accepts groove 12 inboards, and each conductive frame 20 is connected with a lead 21 respectively, to connect with power supply, in 20 each air outlet 11 positions of going up corresponding insulation board 10 of framework, then have staggered frame net 22 and frame mouth 23;

Several PTC thermal resistors 30, can be cellular, be placed on wherein each frame mouth 23 top of the conductive frame 20 of an insulation board 10, make all sides of each PTC thermal resistor 30 all be arranged with frame net 22, the heat that PTC thermal resistor 30 is produced dispels the heat except that volatilizing voluntarily, still on the frame net 22 around conducting to, coefficient of heat transfer is increased;

One elastic board chip 40, be placed on that (this elastic board chip 40 also can be two between 30 groups of a conductive frame 20 and several PTC thermal resistors, be respectively to establish a slice between each conductive frame 20 and the PTC thermal resistor 30), each the frame net 22 and frame mouth 23 positions of corresponding conductive frame 20 all have a notch 41, the madial wall of this notch 41 is stretched flexible 42 to PTC thermal resistor 30 pleurapophysis, with the sidewall butt of PTC thermal resistor 30; Because the heating element adstante febre probably can make elastic board chip 40 distortion, so, this flexure strip 40 during fabrication should be with heat-resisting whippy phosphorus bronze sheet, stainless steel substrates ... etc. material make, in addition, the structure of this elastic board chip 40 also can be as shown in Figure 3, the rib that promptly separates into notch 41A week side can be the tortuous up and down design of wave, makes elastic board chip 40A also have elastic effect.

After above-listed structure is made up in regular turn, promptly as shown in Figure 2, with the mutual interlocking of two insulation boards 10 with the combination of each assembly interlocking because the setting of flexible plate 40, make each assembly not be subject to generate heat and stop expanding with heat and contract with cold influence and produce in conjunction with the defective that gets loose; And, because but all sides of every PTC thermal resistor 30 all are provided with the frame net 22 of heat conduction, on each frame net 22 around the heat that each PTC thermal resistor 30 is produced can conduct to, strengthen heat-conducting area, coefficient of heat transfer is increased, and then raising Pdt(energy), so the setting of the utility model frame net 22 also known PTC thermal resistor effect than similar number is good.In addition, the dynamic characteristic of general PTC is when adding a big voltage, initial resistance is little of big electric current, yet electric current enters the PTC field by causing the heating of PTC thermal resistor after a time, electric current promptly reduces gradually, thermal capacity, the coefficient of heat transfer of its reaction time and PTC thermal resistor and to apply the resistance value of voltage, PTC thermal resistor relevant, thermal capacity, resistance value is littler, apply voltage and coefficient of heat transfer is bigger, and then the reaction time is shorter.As seen the utility model is because coefficient of heat transfer is big, so the reaction time is short, efficient is high.

Claims

1, a kind of positive temperature coefficient (PTC) heating element, it comprises:

Two conductive frames, each framework all are provided with several frame mouths, and the frame mouth of two frameworks is corresponding all mutually,

Several PTC thermal resistors are installed between two conductive frames respectively and are located in frame mouth place, and its structure can be cellular,

Each the frame mouth week side that it is characterized in that this two conductive frame all is provided with and makes heat that each PTC thermal resistor produced except that auto-radiating own, the frame that still can conduct to periphery is online, the conducting surface of heat is increased with the increase coefficient of heat transfer, and improve the netted frame net of the heat efficiency.

2, positive temperature coefficient as claimed in claim 1 (PTC) heating element, it is characterized in that: can be provided with elastic board chip between this conductive frame and PTC thermal resistor, each the frame mouth and the frame net position of the corresponding conductive frame of this elastic board chip all are provided with notch, and the inwall of notch is stretched to PTC thermal resistor pleurapophysis and is made when making up and can brute force prop up the PTC thermal resistor, makes combination flexure strip more closely.

3, positive temperature coefficient as claimed in claim 2 (PTC) heating element is characterized in that: it is wave meander-like up and down that this elastic board chip also can be the rib that separates into notch, makes it have elasticity.