CN2074523U - positive temperature coefficient heater - Google Patents

Abstract

A Positive Temperature Coefficient (PTC) heater, comprising: two conductive frames, each frame is provided with a plurality of frame openings, the frame openings of the two frames are provided with a plurality of frame openings, and the frame openings of the two frames correspond to each other; several PTC thermal resistance bodies, which are respectively installed between the two conductive frames and positioned at the frame openings, can be in a honeycomb type; the improvement lies in that the periphery of each frame opening of the two conductive frames is provided with a net frame net, and an elastic sheet is arranged between the conductive frames and the PTC thermal resistor body, so that the heat generated by the PTC thermal resistor body can be conducted to the frame net on the periphery, thereby increasing the heat conduction surface and the heat dissipation coefficient to improve the efficiency, and leading the combination of all components to be more compact.

Description

The utility model relates to a positive temperature coefficient (PTC) heater, especially a structure that can improve the heating efficiency of each PTC thermal resistance body, and the tight effect of each component after combination is better than that of a single PTC heater .

The structure of the known PTC heater is generally a PTC thermal resistor group composed of one or more PTC thermal resistors, and a power supply voltage is applied to its two ends to make the PTC thermal resistor generate heat. Generally, after the PTC thermal resistance body receives the external voltage, it starts to consume energy due to the passage of the power supply. The input voltage and current (V.I) are consumed by the temperature rise of the PTC itself and the heat dissipation of the PTC. The balance formula is as follows:

Pdt=VIdt=HdT+D(T-T ₂ )dt

In the formula:

D is the heat dissipation coefficient (W/K),

P is the thermoelectric power,

V is the voltage,

I is the current,

H is the heat capacity,

T is the surface temperature of the thermal resistance,

Td is the ambient temperature.

It can be seen from the formula that when the heat dissipation coefficient increases, the obtained Pdt (energy) also increases. For the structure of the known PTC heater, there is no structural design to increase the heat dissipation coefficient, and there is no improvement in the heating efficiency. Moreover, general PTC heaters have multiple components, which are often affected by thermal expansion and contraction when they are assembled. Over time, the close relationship between components will become loose.

The main purpose of the utility model is to provide a PTC heater that can increase the heat dissipation coefficient to improve the energy of the PTC heater in order to overcome the above-mentioned shortcomings.

Another object of the present utility model is to provide a PTC heater that can keep the combination of components tight.

The positive temperature coefficient (PTC) heater proposed by the utility model includes: two conductive frames, each frame is provided with several frame openings, and the frame openings of the two frames are all corresponding to each other; several PTC thermal resistance bodies are respectively installed on the two The conductive frames are positioned at the opening of the frames, and their structure can be honeycomb. Its improvement is that the sides of each frame opening of the two conductive frames are provided with mesh frame nets, so that the heat generated by each PTC thermal resistance body can not only dissipate heat by itself, but also conduct to the surrounding frame nets, so that the heat The conductive surface is increased to increase the heat dissipation coefficient and improve thermal efficiency.

An elastic plate can be arranged between the conductive frame and the PTC thermal resistance body, and the elastic plate corresponds to each frame opening of the conductive frame, and a notch is provided at the position of the frame net, and the inner wall of the notch faces the PTC thermal resistance body There is an elastic piece protruding from the side, so that the elastic piece of the elastic plate can strongly resist the PTC heat resistance body during combination, making the combination more compact.

The elastic plate can also be the ribs partitioned into notches in the shape of waves and zigzags up and down to make it elastic.

A preferred embodiment is exemplified below, and the present invention is described in detail in conjunction with the accompanying drawings:

Fig. 1 is the structural exploded view of the embodiment of the present utility model;

Fig. 2 is the structural combination figure of the embodiment of the present utility model;

Fig. 3 is a structural diagram of an elastic plate in an embodiment of the present invention.

Please refer to the exploded view and combined view of the utility model embodiment shown in Fig. 1 and Fig. 2 . in:

The second insulating board 10 can be made of heat-resistant plastic material (such as P.P.S. polyxylene sulfide or P.A. polyamine or P.O.N. polyacetal and other plastic materials), and the middle part has several corresponding air outlets of the second insulating board 10. There is a receiving groove 12 at the opposite inner side of the insulating plate 10 corresponding to the positions of the air outlets 11;

Two conductive frames 20 are respectively fixed on the inside of the receiving groove 12 of an insulating board 10, and each conductive frame 20 is respectively connected with a lead 21 to connect with the power supply, corresponding to each air outlet 11 of the insulating board 10 on the frame 20 surface At the position, there are frame nets 22 and frame openings 23 arranged in a staggered manner;

Several PTC thermal resistance bodies 30 can be honeycomb, placed above each frame opening 23 of the conductive frame 20 of one of the insulating plates 10, so that each PTC thermal resistance body 30 is surrounded by a frame net 22 , so that the heat generated by the PTC thermal resistance body 30 can not only volatilize and dissipate heat by itself, but also conduct to the surrounding frame net 22, so that the heat dissipation coefficient increases;

An elastic plate 40 is placed between a conductive frame 20 and several PTC thermal resistance bodies 30 groups (the elastic plate 40 can also be two pieces, that is, between each conductive frame 20 and the PTC thermal resistance body 30 There is one piece), there is a notch 41 corresponding to each frame net 22 and frame opening 23 of the conductive frame 20, and an elastic sheet 42 protrudes from the inner wall of the notch 41 to the side of the PTC thermal resistance body 30, so as to be compatible with The side wall of the PTC thermal resistance body 30 abuts; since the elastic plate 40 may be deformed when the heater generates heat, the elastic plate 40 should be manufactured with a heat-resistant and elastic phosphor copper sheet or a stainless steel sheet... .. and other materials, in addition, the structure of the elastic plate 40 can also be shown in Figure 3, that is, the ribs partitioned into the sides of the notch 41A can be designed to bend up and down in waves, so that the elastic plate 40A also has elasticity Effect.

After the above structures are combined in sequence, as shown in Figure 2, each component is locked and assembled by interlocking the two insulating plates 10. Due to the setting of the elastic plate 40, each component is not susceptible to heat and The thermal expansion and contraction of the stop will cause the defect of loose connection; and, since the peripheral side of each PTC thermal resistance body 30 is provided with a heat-conductive frame net 22, the heat generated by each PTC thermal resistance body 30 can be conduct to each surrounding frame net 22, increase the heat conduction area, increase the heat dissipation coefficient, and then increase the Pdt (energy). good. In addition, when a large voltage is applied to the dynamic characteristics of a general PTC, the initial resistance is small and a large current passes through it. However, after a period of time, the current passes through the PTC thermal resistance and enters the PTC field, and the current gradually decreases. The response time is the same as that of a PTC. The heat capacity and heat dissipation coefficient of the thermal resistance body are related to the applied voltage and the resistance value of the PTC heat resistance body. The smaller the heat capacity and resistance value, the larger the applied voltage and heat dissipation coefficient, the shorter the response time. It can be seen that the utility model has short reaction time and high efficiency due to the large heat dissipation coefficient.

Claims (3)

1. A positive temperature coefficient (PTC) heater comprising: Two conductive frames, each frame is provided with several frame openings, and the frame openings of the two frames are all corresponding to each other, Several PTC thermal resistance bodies are respectively installed between two conductive frames and positioned at the frame opening. Its structure can be honeycomb type, It is characterized in that the sides of each frame opening of the two conductive frames are equipped with a device so that the heat generated by each PTC thermal resistance body can not only dissipate heat by itself, but also conduct to the surrounding frame nets, so that the heat conduction surface is increased to The mesh frame net increases the heat dissipation coefficient and improves the thermal efficiency. 2. The positive temperature coefficient (PTC) heater as claimed in claim 1, characterized in that: an elastic plate can be arranged between the conductive frame and the PTC thermal resistance body, and the elastic plate corresponds to each frame opening of the conductive frame There are notches at the position of the frame and the frame net, and the inner wall of the notch protrudes toward the side of the PTC heat resistance body, so that when combined, it can strongly resist the PTC heat resistance body and make the combination more tightly. 3. The positive temperature coefficient (PTC) heater as claimed in claim 2, characterized in that: the elastic plate can also be divided into notches, and the ribs are waved up and down to make it elastic.

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