KR20010110621A - Heating unit of ceramics having positive characteristics - Google Patents

Abstract

The present invention relates to a static ceramic heating element having high safety and reliability by protecting the electrode of the ceramic from humidity by preventing oxidation, and even if surface condensation occurs on the fin of the heating element under high humidity conditions such as a bathroom dryer. It is an object of the present invention to provide a static ceramic heating element that pays attention to safety so that the static ceramic electrode surface is not affected at all.

The present invention is a static ceramic heating element unit having a static ceramic and an energizing plate disposed in an aluminum cylinder, and having an insulating plate provided between the cylinder and the energizing plate. In this structure, the aluminum cylinder can be configured to have one slit along its longitudinal direction.

Description

Static Ceramic Heating Element Unit {HEATING UNIT OF CERAMICS HAVING POSITIVE CHARACTERISTICS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static ceramic heating element, and more particularly, to a static ceramic heat source having high safety and reliability by protecting an electrode of a static ceramic from humidity to prevent oxidation. Furthermore, the present invention relates to a static ceramic heating element that has a safety significance so that even if surface condensation occurs on the heating element fin under high humidity, there is no influence on the static ceramic electrode surface at all.

Background Art Conventionally, heating elements and heaters having a structure using electrodes having ceramics with positive characteristics are well known, and many proposals have been made. For example, Japanese Patent Application Laid-Open No. 63-46547 sandwiches a metal plate thinner than the thickness of a metal heat radiator between an electrode surface of a static thermistor and a metal heat radiator, and adheres with an insulating adhesive to fix the metal heat radiator or metal plate. Disclosed is a structure that serves as an electrode. In addition, Japanese Patent Application Laid-open No. Hei 4-15597 discloses a semiconductor heater, which can be used as a heat source even under conditions of high temperature and high humidity, such as a clothes dryer, and prevents the occurrence of rust even if condensation occurs on the surface. A semiconductor heater having a structure is disclosed. In this structure, the core material of the electrode material, the terminal plate, and the heat radiation fin is formed of the same aluminum alloy material, so that the potential difference between the thermal spraying electrode and the electrode plate is zero, thereby preventing the occurrence of electric corrosion. It is configured to

However, what has been proposed so far, including the above-mentioned prior art documents, is still insufficient to protect the positive electrode from humidity and achieve a satisfactory antioxidant function.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide a safe and reliable static ceramic heating element unit by protecting an electrode of a static ceramic from humidity and preventing oxidation, and also having a high humidity. It is an object of the present invention to provide a static ceramic heating element that is significant in safety so that even if surface condensation occurs on the heating element fins under no circumstances, the static ceramic electrode surface is not affected at all.

Another object of the present invention is to provide a static ceramic heating element having high thermal efficiency.

Still another object of the present invention is to provide a static ceramic heating element unit suitable for a bathroom dryer and the like, which has excellent safety under high humidity and high durability.

1 is a perspective view of a static ceramic heating element unit according to the present invention;

2 is a cross-sectional view of the static ceramic heating element unit broken in accordance with A-A of FIG.

3 is an overall schematic view of a ceramic heater having a structure in which a static ceramic heating element unit of the present invention is disposed between a pair of heat dissipation fin assemblies;

4 is an explanatory diagram showing an example of a method (assembly method) for forming the static ceramic heating element unit of the present invention;

5 is an explanatory diagram showing another example of the method (assembly method) of forming the static ceramic heating element unit of the present invention.

<Description of the symbols for the main parts of the drawings>

1: heating element unit

10: casing

11: slit

12: heating element

13: PTC device

14 electrode

15, 16: electrode plate

17: insulator

20: cap

22, 23: heat sink fin aggregate

The present invention is a static ceramic heating element unit having a static ceramic and an energizing plate disposed in an aluminum cylinder, and having an insulating plate provided between the cylinder and the energizing plate.

Moreover, in the said structure, it is preferable that the said aluminum cylinder is made into the structure provided with one slit along the longitudinal direction. As for the position of a slit, it is more preferable to be formed in the substantially center position of one flat part of an aluminum cylinder.

Moreover, it is preferable that the said aluminum cylinder is made into the structure of a flat cylinder which has a rectangular cross section.

Furthermore, the present invention superimposes a current-carrying plate for energization on an electrode of a static ceramic and inserts it into an aluminum cylinder having a generally rectangular cross section, wherein the aluminum tube and the current-carrying plate are disposed between the aluminum tube and the current-carrying plate. An insulating plate is provided to insulate each other, and both ends of the cylinder are provided with connection terminals connected to the current carrying plate, and both ends of the cylinder are coated with a heat resistant insulating material to form a static ceramic heat source to form a ceramic ceramic heating element. .

In the above configuration, the aluminum cylinder can be configured with one slit along the longitudinal direction, and further, the heat dissipation fin made of aluminum is squeezed and fixed to the positive electrode by the adhesive on the positive ceramic heat source. can do.

Moreover, it is also possible to set it as the structure which sealed the both ends of the said aluminum cylinder with the heat resistant insulating material.

Moreover, it is also possible to set it as the structure which crimps | bonds and fixes the said aluminum radiating fin to the said aluminum cylinder directly with a heat-resistant insulating adhesive.

As described above, the present invention is a static ceramic heating element unit which arranges a static ceramic and an energizing plate in an aluminum cylinder, and has an insulating plate provided between the cylinder and the energizing plate. It is possible to provide protection from heat and oxidation prevention, and to provide a stable ceramic heat source with high safety and reliability.

Furthermore, even if surface condensation occurs on the heating element fins under high humidity conditions, such as for use in a heater applied to a bathroom dryer or the like, the static ceramic element for safety is important so that there is no influence on the surface of the static ceramic electrode. It is possible to provide a heater such as a bathroom dryer having excellent thermal efficiency.

First, preferred embodiments of the present invention will be described with reference to the drawings.

First, in FIG. 1 and FIG. 2 which show a structural example of the heat generating unit of the present invention, the heat generating unit 1 has a substantially rectangular cross section and a slit 11 almost in the center of the tip 10a having a flat surface. ), A casing 10 made of aluminum, which is formed of aluminum, and a heat generating element 12 is disposed therein.

In this case, the slit 11 is formed for guiding the thermal expansion of the heat generating element 12 to be described later inside the casing 10 and for improving the adhesion and workability with the internal element, so that the slit 11 must be used for the entire length of the casing. Since it is not necessary to form over and there is no strong necessity which must be provided in a center part, the position and shape can be changed suitably. However, in the results of various experiments, the thickness of the opposing side wall, that is, the thickness 10b of the surface in the thickness direction is formed to be significantly thinner than the thickness of the other flat surface (the above 10a) to have flexibility and expandability. Rather, as shown, by forming the slit 11 over the entire length of one center part, it turned out that it is excellent in workability and assembly efficiency as a whole.

By the way, the heat generating element 12 is used as a PTC element 13, i.e., an overcurrent prevention device, such as a static ceramic element at the center thereof, as shown in the drawing, and the temperature rises and resistance increases during passage of a large current. To reduce the current (Positive Temperature Coefficient of Resistance) by placing the electrode plate 15 on one side with the electrode 14 on the upper surface, and in the same manner, the electrode 14 on the lower surface The other electrode plate 16 is arranged in close contact with each other. Then, a U-shaped insulator 17 is disposed outside the electrode plates 15, 16 on both sides.

Although an electrode 14 is formed between the PTC element 13 and the insulator 17, between the electrode 14 and the PTC element and between the electrode 14 and the electrode plates 15 and 16. Adhesion can be made through an antioxidant adhesive. In this case, although it is conductive as an adhesive agent, it is also possible to set it as the structure which employ | adopts an insulating adhesive agent, and electrically connects the elements which adhere | attach mutually. In that case, in order to make conduction suitable, it is preferable to form fine unevenness | corrugation in the surface to be crimped | bonded, and to make it connect with each other through the said insulating adhesive agent.

As shown in Fig. 2, the PTC element 13 has a structure in which a plurality of the PTC elements 13 are arranged side by side. The number of PTC elements can be selectively increased or decreased suitably. Each PTC element 13 needs to be disposed with sufficient care so as not to be damaged by an impact to each other. Therefore, a buffer means or a spacer (21 in FIG. 2) or the like may be arranged mutually, and for positioning A frame, a yoke, etc. can also be arrange | positioned suitably. 1 and 2, reference numeral 20 denotes a cap for sealing the side of the heat generating element 12, that is, the side where the electrode plates 15, 16 are exposed.

3 shows a configuration of a ceramic heater in which the heat generating unit 1 having the above configuration is provided between a pair of heat dissipation fin assemblies 22 and 23. The heat dissipation fin aggregates 22 and 23 may use various types, and the detailed description thereof will be omitted since the configuration itself is not an important main part of the present invention. A configuration having a pin portion 25 formed in a corrugation box shape or a cut-up type in the 24 is typical. Then, the heat generating unit 1 shown in Figs. 1 and 2 is sandwiched between the heat dissipation fin aggregates 22, 23 formed as described above and fixed with an insulating adhesive. Reference numeral 26 in FIG. 3 denotes an adhesive layer made of an insulating adhesive.

Next, the formation example of the heat generating unit 1 of this invention mentioned above is demonstrated easily. In Fig. 4, in the U-shaped casing material 30 made of aluminum, the insulating material 17 made of a suitable synthetic resin, such as Teflon, from the bottom portion thereof upward, for example, the electrode 14 and the electrode thereon. The PTC element 13 is placed on top of the electrode, and the electrode 14 and the insulating material 17 are disposed on the PTC element 13 to form a laminate. After that, the protruding end of the casing material 30 is placed inside. It is bent to configure the casing (10). In this case, the bent both ends are opposed, so that the slit 11 is formed between the opposite ends. Moreover, between the electrode 14 and the PTC element 13, it is also possible to interpose the desired adhesive whose main purpose is oxidation prevention.

4 is formed by stacking each element (for example, an electrode or a PTC element) constituting the heat generating unit 1 as a heat generating element, and finally bending the protruding end of the casing material 30 to the inside. Although it is a formation method, as shown in FIG. 5, the heat generating element 1 and the casing 10 are previously formed separately, and after that, the heat generating unit 1 is attached to the casing 10 in which the slit 11 was formed. It can also form by inserting from the side opening part. In this insertion, since the said slit 11 is formed, since the whole casing 10 expands and opens to some extent freely, insertion becomes easy.

In addition, what constitutes the heat generating unit 1 which becomes a laminated body in FIG. 5 is that the PTC element 13 is arrange | positioned in the middle as mentioned above, the electrode 14 upper and lower, and the insulator 17 on the outer side are provided. It is arranged.

As described above, the present invention is a static ceramic heating element unit in which a static ceramic and a conductive plate are disposed in an aluminum cylinder and an insulating plate is provided between the cylinder and the conductive plate. It is possible to protect the electrode of the ceramic from humidity and to prevent oxidation, thereby providing a stable ceramic heat source with high safety and reliability.

In particular, in the case of use in a heater applied to a bathroom dryer or the like, even if surface condensation occurs on the heating element fins under high humidity, the static ceramic element which is significant in safety so as not to affect the static ceramic electrode surface at all. It is possible to provide a heater such as a bathroom dryer having excellent safety and thermal efficiency. Moreover, since it is comparatively simple structurally, it can be set as a product with high precision and excellent in mass productivity.

Claims (10)

A static ceramic heating element unit, comprising: placing a positive ceramic and a conductive plate in an aluminum cylinder, and having an insulating plate provided between the cylinder and the conductive plate. The ceramic ceramic heating element unit according to claim 1, wherein said aluminum cylinder has one slit along its longitudinal direction. The static ceramic heating element unit according to claim 1 or 2, wherein the aluminum cylinder is a flat cylinder having a rectangular cross section. An insulating plate for insulating the aluminum tube and the plate is arranged between the aluminum tube and the plate. And a connecting terminal for connecting the conducting plate to both ends of the tube, and forming a ceramic ceramic heat source on both ends of the tube with a heat resistant insulating material. The static ceramic heating element unit according to claim 4, wherein the aluminum cylinder has one slit along its longitudinal direction. The static ceramic heating element unit according to any one of claims 1, 2, 4, and 5, wherein an aluminum heat dissipation fin is press-bonded and fixed to the positive ceramic heat source with an adhesive, respectively. The static ceramic heating element unit according to claim 6, wherein both ends of the aluminum cylinder are sealed with a heat resistant insulating material. The static ceramic heating element unit according to claim 4, wherein the aluminum heat dissipation fin is press-fixed and fixed to the aluminum cylinder with a heat-resistant insulating adhesive material. Insulators are arranged on the inner wall surface of the ceramic cylinder having a rectangular cross section, and a plurality of ceramic elements such as PTC elements are placed in the center of the ceramic cylinder, and electrodes are disposed on the upper and lower surfaces of the ceramic element. The ceramic ceramic heating element unit is formed by placing an electrode plate in contact with the inner surface of the insulator on the upper and lower sides of the electrode. A static ceramic heating element unit inserted between a pair of heat dissipation fin aggregates, the heating element unit arranging an insulator on an inner wall surface of a ceramic cylinder having a rectangular cross section, and in the ceramic cylinder, ceramics such as a PTC element at the center thereof. A plurality of elements are disposed at a distance from each other, and electrodes are disposed on upper and lower surfaces of the ceramic element, and electrode plates contacting the inner surface of the insulator are disposed on upper and lower surfaces of the electrode. .