JPS5995334A - Heat exchanging type fan heater - Google Patents

Abstract

PURPOSE:To make the heater compact and reduce noise by a method wherein the fan blade of a fan is formed by a heating body such as ceramic or the like, for example, which generates Joule heat, and a heat exchanger and the fan are integrated together. CONSTITUTION:The crossflow type fan 8, arranged in a casing 1, consists of a plurality of fan blades 10 and the constituent of the fan blades is the insulating body of alumina and the conductive body of the solid solution of titanium carbide and titanium nitride. The specific resistance is not large enough by one sheet of the fan blade, therefore, in order to enlarge an electric resistance, an electrode 28 is attached to one sheet of the fan blade and the other fan blades are connected sequentially in series to the fan blade equipped with the electrode through conductive bodies 12. The fan 8 is connected directly to the driving shaft of a motor 16 through a coupling 15 to drive the rotation thereof. Electric current, conducted through brushes and slip rings, heats the whole bodies of the fan blades 10 due to the Joule heat, therefore, the fan may be used both for the heat exchanger and the ventilating fan.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange type fan heater, and is effective for use in, for example, an automobile heater or a motor-driven hot air heater for home use.

Conventionally, heat exchange type fan heaters have been composed of a heat exchanger that exchanges air with the heat exchanger and a blower that blows air. However, because the heat exchanger 1 and the blower are installed separately, it lacks compactness, and due to pressure loss in the heat exchanger, it is necessary to use a blower with a higher output. The problem was that the higher the value, the larger the value.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a heat exchange type fan heater that is highly compact and has low noise.

In order to achieve the above object, the present invention uses the following technical means. That is, the fan blade of the blower is made of a heating element such as ceramic that generates Joule heat, and the heat exchanger and the blower are integrated.

Next, one embodiment of the present invention will be described based on the drawings.

FIGS. 1 and 2 are examples of hot air heaters for automobiles or homes that use a cross-flow type fan. 1 is a casing that regulates the flow of air, and includes an inlet 2 and a casing l for introducing air into the casing 1 from the outside.
A discharge port 3 is provided for discharging air from the inside to the outside. This intake port 2 is equipped with a lattice-shaped intake grille 4 for removing relatively large foreign matter from the introduced air, a filter 5 for removing dirt, dust, etc.
A wire mesh 6 is provided for fixing the air, and a discharge grille 7 with a louver is provided at the discharge port 3 to arbitrarily change the discharge direction of the discharged air.

A cross-flow fan 8 is disposed inside the casing 1, and both ends of its shaft portion 24 are supported by the casing 1 via bearings 9. This cross-flow type fan 8 consists of a plurality of fan blades 10, each of which has a width of approximately 101111 mm and a thickness of approximately 1 mm.
．． It has 3 parts and is about 170 fins long. The components are alumina (AA203) as an insulator, titanium carbide 'l''iC and titanium nitride 'riN (Ti (CN)) as conductors.Since the specific resistance of this single fan blade is small,
In order to increase the electrical resistance, an electrode part 28 is attached to one fan blade, and the other fan blade is attached to the fan blade 10a with this electrode as shown in the figure &01i! and,
The left guard in the figure of the fan blade 10b adjacent thereto is connected by a conductor 12. And this fan blade Jo
The right end in the figure of b and the right end in the figure of the adjacent fan blade 10C are connected in the same way with the conductor 2. Thereafter, the fan blades IO are sequentially connected with the conductor 12 in the same way. A side plate 14 holds the fan blade 10 and is made of a heat-resistant insulator such as ceramic. These fan blades 10, conductors 12, and sides 7'L/-114 are joined by adhesive, screws, or glue vents. The fan 8 as described above is connected to a drive shaft of a motor 16 via a coupling 15 and is driven to rotate.

Next, a method of forming the fan blade 10 described above will be explained.

Alumina (8β203), which is an insulator, and titanium carbide, TiC, which is a conductor to adjust the specific resistance value of fan blades.
and titanium nitride T i N are mixed.

This is combined with PVB (polyvinyl butyral), which is a binder.
, DBP (dibutyl phthalate) was added, and it did not dissolve with the solvent (ethanol, trichlene). A ceramic sheet is made from the slurry 17 thus produced by the doctor blade method shown in FIG. That is, the slurry 17 is stored in the dam 18, and the blade 19, which is attached to the dam 18 and is movable up and down, is pulled upward in the figure. Then, the slurry 17 flows out from the gap below the blade 19. Below this gap, the film 20 is driven horizontally as the roller 21 rotates. A constant amount of the slurry 17 flows out onto this horizontally driven film 20 per unit time, so that a thin film-like ceramic sheet 22 with a constant thickness is completed. This ceramic sheet 22 is dried at about 60°C and punched into an arbitrary shape.
The fan blade 10 is formed by firing at 0°C. The fan blade 10 is tilted approximately 20° to 40° with respect to the normal line of the outer circumferential circle of the side plate 14.
Attach to.

Next, a mechanism for passing current through the fan blades will be explained.

As shown in FIG. 5, a slip ring 25 is disposed in a just portion 24 of the fan 8 extending rightward in the figure. This slip ring 25 has a brush 3 held by a holder 29 whose one end is fixed to the casing l.
0 is held down by a spring 31 fixed to the casing 1 so that t>tl. Further, one end of a conducting wire 27 coated with a heat resistor 26 is joined to the slip ring 25, and the other end passes through the inside of the shaft portion 24 and is joined to the electrode portion 28 of the fan blade lOa. As shown in FIG. 6, this electrode portion 28 is coated with a brazing material 32 to improve the electrical conductivity between the conductor 27 and the fan blade jOa.

The port 33 includes a conducting wire 27.

The heat exchange type fan heater constructed as described above operates as follows.

When the motor 16 rotates, the fan 8 also rotates accordingly. Due to the blowing effect of the rotation of the fan 8, air from outside from which dirt, dust, etc. have been removed by the suction grill 4, filter 5, and wire mesh 6 is introduced into the casing l through the suction port 2. On the other hand, at the same time as this motor 16 rotates, the brush 30 is energized, and this energized current is transferred to the slip ring 2 that rotates together with the shaft portion 24.
5 flows into the slip ring 25 by sliding contact with the brush 30. Then, this current flows through the conductive wire 27 connected to the slip ring 25 and is applied to the electrode portion 28 of the fan blade 10a. Furthermore, since this current flows from the electrode section 28 through the plurality of fan blades 10 connected in series as if it were flowing through a single resistance wire, the entire fan blade 10 is heated by the Joule heat generated at that time. Occurs. Since the fan blade 10 generating heat rotates in the introduced air, forced convection heat transfer is performed between the introduced air and the fan blade 10. As a result, the heat generated in the fan blades 10 is supplied to the introduced air, and the thus warmed air is discharged to the outside from the discharge port 3. At this time, discharge port 3
The heated air can be discharged in any direction by the discharge grill provided in the. In this way, the cold space is heated and a comfortable living space is provided.

Next, a second embodiment of the present invention will be described.

In the first embodiment, a cross-flow type fan was used, but a centrifugal fan like the one shown in FIGS. 7 and 8 may also be used. Centrifugal fans can be classified into sirocco fans, radial fans, and turbo fans depending on the inclination of the fan blades, but here we use the sirocco fan. Of the side plates 14 provided on both sides of the sirocco fan 34, the side plate 1-142 on the suction port side has a ring shape, and the side plate 1-14b on the opposite side from the suction port has a disc shape. A shaft portion 24 is fixed to this disc-shaped side plate 14b, and is supported by the casing 1 via a bearing 9. The rest of the structure and operation are the same as in the first embodiment, but the air flow is different because a centrifugal fan is used. That is, air is introduced into the side of the sirocco fan 34 from the suction port 2 as indicated by the arrow in FIG. 8, and the air heated by the rotation of the sirocco fan 34 is discharged in a centrifugal direction. This discharged air flows along the inner surface of the casing 1 and is discharged to the outside from the discharge port 3.

Next, a third embodiment of the present invention will be described.

As shown in Figs. 9 and 10, an axial fan is used. The configuration is shown in Figure 9: fan blade ■0, electrode 2
8, a ring 35 for holding the fan blades, and a conductor 12 for forming a series resistance circuit between the fan blades. In FIG. 10, there are a spring 31 that presses down the brush, a brush 30, a slip ring 25, a conducting wire 27, a fan boss 36, and a shaft 24. The rest of the structure and operation are exactly the same as in the first embodiment, but the air flow is different because the fan type is different. In other words, air flows in the axial direction of the shaft portion 24 as shown by the arrow in FIG. Further, the current flowing through the fan blade 10 is
It flows in the direction shown by the arrow in the figure.

In the embodiments described above, ceramic is used as the material for the fan blade IO, but any heat generating element from which the fan blade can be manufactured may be used, for example, metal such as nichrome may be used.

In addition, the slip ring 25 and the brush 30 are attached to the shaft portion 2.
4, but it may also be attached to side plays 1 and 14. Furthermore, the fan blade 10 can be used as an air blower by rotating only the fan with a motor without applying electricity.

Further, when the specific resistance of the fan blade 10 is small, the conductors 12 are connected in series, but when the specific resistance of the fan blade 10 is large, it goes without saying that they may be connected in parallel.

In the heat exchange type fan heater of the present invention described above, by integrating the blower and the heat exchanger, the shaft L) can be made smaller. Furthermore, since the pressure loss of the heat exchanger can be reduced, the output of the blower can be reduced. Therefore, the pressure of the fan can be reduced, which reduces noise, and the power consumption of the motor is also reduced, helping to save energy.

[Brief explanation of the drawing]

Figures 1 to 6 show the first embodiment of the present invention. Figure 1 is a front view of the hot air heater, Figure ff12 is a side view, Figure 3 is a perspective view of the fan, and Figure 4 is a fan. Fig. 5 shows the mechanism for passing current through the fan blade, Fig. 6 shows the electrode part of the fan blade, and Fig. 7.8 shows the second embodiment. Fig. 7 is a side view, Fig. 8 is a front view, Figs. 9 and 10 show the third embodiment, Fig. 9 is a side view, and Fig. m10 is a front view. DESCRIPTION OF SYMBOLS 1... Gauging, 2... Suction port, 3... Discharge port, 8... Fan, 10... Fan blade, 28...
...Electrode part. Representative Patent Attorney Takashi Okabe 1 Figure 1'02 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 10 Figure 15

Claims (1)

[Claims] 1. A heat exchange fan heater comprising a rotatable fan having fan blades, the fan blades comprising a heating element that generates Joule heat.