JPS6241384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive temperature coefficient thermistor heating element that has a large heat exchange area and can perform heat exchange over a wide range.

Conventionally, various shapes of positive temperature coefficient thermistor heating elements have been devised, including cylindrical types, harmonica-shaped types, honeycomb structures, etc. Honeycomb structures include cylinders bundled together, corrugated plate shapes, etc. A structure in which ceramic sheets are laminated has also been proposed.

However, when using an element body created in this way, if you try to perform sufficient heat exchange, the resistance to the fluid such as air will increase, and if you try to reduce the resistance to the fluid, you will not be able to generate enough heat. It has drawbacks such as not being able to be replaced, and the fluid is blown out in only one direction.

The present invention eliminates the above-mentioned conventional drawbacks, and has low resistance to fluids such as air, a large surface area for heat exchange, and at the same time, the direction of fluid blowout is radial around the element body. The present invention aims to provide a positive temperature coefficient thermistor heating element characterized by the following.

Hereinafter, one embodiment of the present invention will be described in Figures 1 to 3.
This will be explained with figures.

In the figure, 1 is a cylindrical positive temperature coefficient thermistor element body formed by firing at a predetermined temperature, with a plurality of through holes 2 provided in a part over the entire circumference, 3 and 4
is a cylindrical positive temperature coefficient thermistor element body formed by providing a plurality of through holes 5 and 6 around the entire circumference with the length of the through hole portion of the element body 1;
3 and 4 have different diameters so as to have a constant gap therebetween. Reference numeral 7 denotes a disc-shaped electrode plate attached to the outer periphery of the central part of the element body 1 through the center hole so as to be located at one end of the through-hole portion of the element body 1; Two concave portions having the same diameter as the base bodies 3 and 4 are provided concentrically on the inner side of the through-hole portion. Reference numeral 8 designates a disc-shaped electrode plate having three concentric concave portions having the same diameter as the element bodies 1, 3, and 4 on the inside facing the electrode plate 7.
One end of the element bodies 3, 4 is held in the recess of the electrode plate 7, while the other end of the element bodies 1, 3, 4 is held in the recess of the electrode plate 8. That is, the electrode plates 7 and 8 hold the element bodies 1, 3, and 4 concentrically at a constant interval, and are fixed by appropriate means.
At this time, the adjacent through holes 2 and 5 and the through holes 5 and 6
They are arranged so that they do not coincide in the radial direction and are staggered.

When a fluid such as air is sent from the end face of the PTC thermistor element 1 at the center of the structure created as described above on the side where the through hole 2 is not created, heat exchange takes place in the concentric cylindrical part. Thereafter, a PTC thermistor heating element can be obtained in which fluid is blown out radially over the entire circumferential surface from the through holes 6 of the outermost PTC thermistor body 4.

According to this configuration, heat exchange is performed in the gaps between the through holes 2, 5, 6 and the concentric elements 1, 3, 4, so the heat exchange efficiency is very high. By changing the number (in this case, one may be sufficient), the size and position of the through holes 2, 5, and 6, heat exchange over a wide range can be performed.

FIG. 4 shows another embodiment of the present invention, in which through holes 2, 5, and 6 are provided over half the circumference of the cylindrical element bodies 1, 3, and 4, and the half circumference portions where the through holes 2, 5, and 6 are located are adjacent to each other. The matching elements 1 and 3 and elements 3 and 4 are arranged alternately so that they do not overlap at all. In this case, since the fluid that has passed through the through holes 2 and 5 hits the outer element bodies 3 and 4 and flows along their inner wall surfaces, it is also possible to further increase the heat exchange efficiency.

FIG. 5 shows still another embodiment of the present invention, in which the intermediate and outermost positive temperature coefficient thermistor elements 3 and 4 are shown.
levers 9 and 10 (9 is not shown) are attached to it so that it can be moved to some extent in the circumferential direction. This configuration has the advantage that the flow rate of the fluid can be arbitrarily and very easily changed by operating the levers 9 and 10, and at the same time, the fluid temperature can also be changed easily.

The positive temperature coefficient thermistor heating element according to the present invention is constructed as described above, and it is possible to provide a heat exchanger that has low resistance to fluids such as air and has a large surface area for heat exchange. The blowout direction is radial around the positive temperature coefficient thermistor body, and furthermore, a heat exchanger with a wide heat exchange range can be easily realized.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the PTC thermistor heating element according to the present invention, Fig. 2 is a perspective view of the PTC thermistor body in the center that constitutes the heating element, and Fig. 3 is the same. FIG. 4 is an exploded perspective view of a PTC thermistor heating element showing another embodiment of the present invention; FIG. 5 is an exploded perspective view of a PTC thermistor heating element showing still another embodiment of the invention. FIG. 1...Positive characteristic thermistor element A, 2, 5, 6...
...through hole, 3, 4...positive temperature coefficient thermistor element B,
7, 8... Electrode plate, 9, 10... Lever.

Claims (1)

[Scope of Claims] 1. A plurality of through holes are formed in a part of a cylindrical positive temperature coefficient thermistor element A, and a plurality of through holes are formed concentrically around the outer periphery of the through hole formed portion of the positive temperature coefficient thermistor element A. One or more cylindrical PTC thermistor elements B each having a through hole are arranged at regular intervals, and both sides of the through hole forming part of the PTC thermistor element A and both sides of the PTC thermistor element B are arranged at regular intervals. is held by an electrode plate,
Fixed positive temperature coefficient thermistor heating element. 2. A positive temperature coefficient thermistor heating element according to claim 1, wherein the positive temperature coefficient thermistor element A and the positive temperature coefficient thermistor element B are arranged alternately so that adjacent through holes do not coincide in the radial direction. . 3. A patent claim in which a through hole is provided in each half circumference of positive temperature coefficient thermistor elements A and B, and the half circumference parts with the through hole are arranged so that adjacent positive temperature coefficient thermistor elements A and B do not overlap at all. range 1
The positive temperature coefficient thermistor heating element described in . 4. Claim 1, wherein the positive temperature coefficient thermistor element B is provided with a lever that can move it in the circumferential direction.
The positive temperature coefficient thermistor heating element described in .