JPS6237075Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating unit that heats gas or liquid using a positive temperature coefficient thermistor element.

Conventionally, as shown in FIG. 1, this type of heating unit has been made by forming a honeycomb shape by providing a large number of through holes 2, . Ohmic electrodes 3 and 4 are provided, and power is supplied to these electrodes 3 and 4 to cause the positive characteristic porcelain 1 to generate heat, and the fan 5
A honeycomb type heater configured to heat the fluid by flowing it through the through holes 2, ..., 2;
Alternatively, although not specifically shown, a large number of thin positive characteristic porcelain plates each having an electrode on two opposing circumferential surfaces are arranged parallel to each other, and air or liquid is passed between them to heat them. Ladder type heaters and the like are known.

However, in the honeycomb type heater as described above, the direction of the flow of air and the direction of the voltage applied to the positive characteristic porcelain 1 by the electrodes 3 and 4 are the same. The temperature distribution between electrodes 3 and 4 is as shown by curve W ₀ in Figure 2.
While the temperature at the middle of the electrode becomes high, when the fan 5 sends the wind W in the direction from the electrodes 3 to 4, the lower temperature wind passes through, as shown by the curve _W1 . The temperature between AB of the positive characteristic ceramic 1 from the electrode 3 to the intermediate section becomes lower than the temperature of the section between BC, and the peak temperature shifts to the exhaust section (the section between BC). For this reason, the resistance of the part between BC increases and the voltage concentrates in that part, a so-called pinch effect, which causes most of the heat generation.
This occurs only in the area between BC, and the area between AB does not make a sufficient contribution as a heating element, resulting in a low heat generation efficiency.

Further, as the wind speed of the wind W sent from the fan 5 increases, the resistance of the positive characteristic porcelain 1 decreases, the flowing current increases, and the amount of heat generated increases, but when the wind speed exceeds a predetermined value. Then, the resistance value of the positive characteristic porcelain 1 becomes unstable around its Curie point, and the power consumption periodically fluctuates, so-called power oscillation occurs, and the wind sent out from the positive characteristic porcelain 1 increases. The disadvantage was that the temperature of the

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to enable use in two directions perpendicular to the direction of the fluid in a heater that generates a large amount of power by directly exposing a positive temperature coefficient thermistor element to a fluid. In this way, the usage mode can be made more general, the heating efficiency of the fluid can be improved, and the heating temperature of the fluid can be kept almost constant.

Therefore, in the present invention, a positive temperature coefficient thermistor material is formed into a long thin plate having a substantially constant width, and long holes are formed at a substantially constant pitch in the width direction, and these long holes are located at the head of the wave. The thin plate is formed by curving the thin plate alternately in a wave-like manner, and electrode films are formed on both main surfaces in the thickness direction of the thin plate, and a fluid is directed in a direction substantially perpendicular to and/or parallel to the long hole. It is characterized by being heated by passing through it.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

An embodiment of the hot air heater according to the present invention is shown in FIG.

The hot air heater in Figure 3 is as shown in Figure 4.
After forming a positive temperature coefficient thermistor material into a long thin plate 11 having a substantially constant width and forming long holes 12, 12, . . . at a substantially constant pitch in the width direction of the thin plate 11, the thin plate 11 is As shown in the figure, the elongated hole 12,
The thin plate 11 is curved and fired in a wave shape so that the thin plates 12, . . . are located at the wave crests 13, 13, . 14 is formed.

With such a configuration, the electrode films 14, 1
4, elongated holes 12, 12, .
The direction of arrow Ar ₁ passing through and the elongated hole 12,
The fluid can be passed in the direction of arrow Ar ₂ , which is approximately parallel to the direction of 12,..., and it can be used for versatility, and even if the fluid is passed in either direction, it will not work as usual. It is possible to prevent a decrease in heat generation efficiency due to the pinch effect and fluctuations in heating temperature due to power vibration. Furthermore, if the fluid is allowed to flow from the direction of arrow Ar ₃ in FIG. 3, it can be passed simultaneously in two directions, perpendicular and parallel to the elongated hole 12, resulting in better heating efficiency.

Furthermore, when there is a restriction on the installation space for the hot air heater, the width of the thin plate 11 can be made smaller to reduce the thickness of the hot air heater, as shown in FIG.

In the above embodiments, in the vicinity of each long hole 12, the direction of the current flowing due to the voltage applied between the electrode films 14 and 14 coincides with the direction of the fluid passing in the direction of the arrow _Ar1 . The area where the two match is small, so there is no problem.

Next, other embodiments of the present invention are shown in FIGS. 7 and 8.
As shown in the figure.

In the embodiment shown in FIGS. 7 and 8, as shown in FIG. 6, a narrow thin plate 11 made of a positive temperature coefficient thermistor material is provided with elongated holes 12, 12, . The thin plate 11 is formed into a petal shape so that both ends coincide with each other, fired, and then fixed to a rotating disk 15 having insulating properties. On both main surfaces in the thickness direction of the thin plate 11,
Similarly to the embodiment shown in FIG. 3, electrode films 14, 14 are formed.

By doing so, for example, when the rotating disk 15 is rotated in the direction of the arrow Ar by a motor (not shown), the air around the rotating disk 15 is transferred to the rotating disk 15.
The air flows in the direction of arrow Ar ₁ from the center of the air, and the hot air heater 16 attached to the rotating disk 15 heats the air along the way.

Therefore, the hot air heater 16 of FIGS. 7 and 8
In this case, the characteristics of the fan and heater can be combined.

As is clear from the detailed description above, the present invention enables the fluid to pass from two or more directions in a heater that generates a large amount of power by directly exposing a positive temperature coefficient thermistor element to a fluid. Since the direction of fluid flow is perpendicular to the direction of current flow, it has excellent versatility and can be used in a pinch like hot air heaters using conventional honeycomb-shaped positive temperature coefficient thermistor elements. This eliminates the problem of heat and power oscillations, improves fluid heating efficiency, and allows fluid heating temperature to be controlled to a nearly constant level.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional hot air heater, FIG. 2 is an explanatory diagram of the operation of the hot air heater of FIG. 1, FIG. 3 is a perspective view of an embodiment of the hot air heater according to the present invention, and FIG. 5 and 5 are explanatory diagrams of the manufacturing process of the hot air heater of FIG. 3, and FIGS. 6, 7, and 8 are explanatory diagrams of other embodiments of the present invention. 11... Thin plate, 12... Long hole, 13... Wave head, 14... Electrode, 15... Rotating disk, 16...
Hot air heater.

Claims (1)

[Scope of utility model registration request] A positive temperature coefficient thermistor material is formed into a long thin plate having a substantially constant width, and long holes are formed at a substantially constant pitch in the width direction, and the thin plate is waved so that these long holes are located at the tops of the waves. While the thin plates are formed by being alternately curved, electrode films are formed on both main surfaces in the thickness direction of the thin plate, and a fluid is passed in a direction substantially perpendicular to and/or parallel to the long holes to heat them. This hot air heater is characterized by: