JPH0224057Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric air heater that uses electricity to generate hot air, and more specifically relates to an electric air heater that aims to be thin.

[Conventional technology]

Conventionally, as shown in FIG. 5, there has been a hot air device in which a heater b and a blower e, which rotates a fan d by a motor c, are arranged in parallel in a casing a, and an improved version thereof is a heater b'. A device (see FIG. 6) has been proposed in which the motor c' and the motor c' are placed apart from each other.

[The problem that the idea aims to solve]

In the former case, that is, the device shown in FIG.
The driving part of the motor c is heated by the radiant heat of the motor c, and the bearing part of the motor c becomes insufficiently circulated, so that the life of the motor c is inevitably shortened. In the latter structure, as shown in FIG. 6, heating of the motor c' by the heater b' can be avoided, but on the other hand, it has the drawback of being unnecessarily bulky even though it is originally compact in size.

[Means to solve the problem]

Here, in a hot air heater configured by arranging an electric heater and a fan rotated by a motor in parallel, the present invention is applied to a drive section of the motor facing the electric heater or near a drive section between the electric heater and this drive section. We provide an electric air heater with a heat shield layer,
By arranging the electric heater and the motor in close proximity, it is possible to make the whole compact and to prevent the heat of the electric heater from having an adverse effect on the motor. teeth,
The heat shield layer is composed only of a heat insulating material,
It can be made of only a reflective material or a combination of both.As for the installation method, it can be directly bonded or vapor-deposited on the drive part of the motor, and the heater and motor can be connected by an appropriate supporting means. It is preferable to install the drive unit between the drive unit and the drive unit.
Furthermore, the surface of the heat shielding layer is made of a material with high far-infrared radiation efficiency such as ceramics or ceramics, or if it is based on metal, zirconia, titania,
It is also possible to form a film by coating, thermal spraying, or anodizing a material with high far-infrared radiation efficiency such as alumina. Metals such as iron and hard plastics are used, and the materials to be vapor deposited and sputtered are aluminum, silver, etc., and the vapor deposition thickness is
100A゜~1μ (100A゜).

[Effect]

By providing a heat shielding layer having the above-mentioned structure, heat is not accumulated in the motor drive section (or even if it is accumulated, only a small amount), thereby preventing a temperature rise in that section. When a material with high far-infrared radiation efficiency is used, the radiant heat can be used effectively, contributing to an increase in the efficiency of the entire air warmer.

〔Example〕

First, in FIG. 1, when the heater 1 and the motor part 3 and fan part 4 of the motorized fan 2 facing the heater 1 are housed in a case 5, a surface of the motor part 3 facing the heater 1 is shown. An example is shown in which a heat shielding layer 6 is attached, and in this case, the structure of the heat shielding layer 6 is one in which a material 8 with high reflectance is laminated on the surface of a heat insulating material 7 (see FIG. 2a), or It is possible to arbitrarily select a material such as one made only of a substance 9 with high reflectance (see FIG. 2b).

In the above embodiment, the distance a between the heater 1 and the motor part 3 is 10 mm, the ambient temperature is 22°C, the fan 2 is a thin axial flow fan with a thickness of 25 mm, and the heater 1 is a PTC positive temperature coefficient thermistor with metal fins. Using a heater with a thickness of 15 mm, the temperature at the center of the front side of the motor was measured. At this time, warm air was generated between the heater 1 and the fan 2, and a temperature rise as shown in FIG. 3 was observed in measurements conducted without applying anything to the motor surface. Next, reflectance 70%, wall thickness
In an experiment in which a 0.05 mm aluminum tape was adhered to the entire front surface of the motor section 3 as a heat shield layer 6, the result was as shown in FIG. This figure is a graph showing the surface temperature of the motor section 3 when the heater 1 is turned off and only the fan 2 is rotating. In other words, the maximum temperature when only the fan is rotating is 48 degrees Celsius. , 37℃, 33℃
However, after stopping Fan 2, it was 65℃,
shows 48° C., and it can be seen that there is a considerable difference in the maximum temperature depending on the presence or absence of the heat shield layer 6.

Due to this fact, when the heater 1 and the fan 2 are brought closer together, the life of the motor is adversely affected by adhering or depositing a reflective carrier on the front part of the motor section 3 of the fan 2. It is possible to construct a thin hot air fan without causing such a temperature rise (see the relationship between ambient temperature and life of the thin axial flow fan in Figure 4), as shown in Figure 1. According to an example, the thickness of the case 5 (dimension b in Fig. 1), which currently requires 70 mm, can be reduced to 55 mm. As another example, instead of attaching the heat shield layer 6 closely to the surface of the motor section 3, as shown in FIG. A similar effect can be obtained by using a structure in which the layer 6 is interposed, and the structure of the heat shielding layer 6 in this case is similar to the above embodiment as shown in FIGS. 2a and 2.
In addition to those shown in b, any selection can be made.

[Effect of idea]

With this idea, the distance between the heater and the fan-equipped motor can be made closer due to the presence of the heat shielding layer, which makes it possible to reduce the overall thickness of the electric air heater and stabilize the life of the motor over a long period of time. This can extend the life of the electric air heater, and the radiant heat accumulated in the fan-equipped motor can be blown to the heater side, increasing the heating effect. By forming it from a material with high rays, health benefits from far infrared rays can also be obtained.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an example of the electric blower of this invention, Figures 2a and b are enlarged cross-sectional views showing two embodiments of a part of it, and Figure 3 shows the effects of temperature rise depending on the presence or absence of a heat shield layer. A graph showing the comparison, FIG. 4 is a graph showing the relationship between ambient temperature and life of a thin axial flow fan, FIG. 5 is a sectional view showing another embodiment of this invention, and FIGS. 6 and 7 are Each is a sectional view of a conventional example. In the figure, 1... heater, 2... fan with motor, 3... motor section, 4... fan section,
5... Case, 6... Heat shielding layer.

Claims (1)

[Claims for Utility Model Registration] 1. In a hot air heater configured by arranging an electric heater and a fan rotated by a motor in parallel, a drive section of the motor facing the electric heater or between the electric heater and the drive section An electric air heater with a heat shield layer near the drive unit. 2. The electric air heater according to claim 1, wherein the surface of the heat shielding layer is a reflective surface. 3. The electric hot air fan according to claim 1, wherein the surface of the heat shielding layer is made of a material with high far-infrared radiation efficiency.