JPH0322197B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a drum dryer with improved thermal efficiency.

[Technical background of the invention]

In general, in a drum dryer, a heater is installed in the air duct that communicates the air blower with the rotating drum. We are trying to supply it to

[Problems with background technology]

Because the heater is located far from the rotating drum, the hot air heated by the heater heats unnecessary parts such as the peripheral wall of the air duct before reaching the rotating drum, resulting in wasted heat. There was a problem in that the heat from the heater was not efficiently utilized.

[Purpose of the invention]

The object of the present invention is to provide a drum dryer which has very little wasted heat release and which is excellent in the effective use of heat from a heater.

[Summary of the invention]

The present invention consists of a fixed plate that fixes the inner surface of the rotating drum, such as the back surface, to the outer box side, and a heater is attached to this fixed plate so that air hot-aired by the heater is immediately supplied into the rotating drum. In addition to reducing wasteful heat release, a radioactive material is attached to the fixed plate heated by the heater to emit infrared rays at wavelengths that are easily absorbed by clothing, etc., and heating is efficient not only with hot air but also with radiant heat. The idea is to allow it to dry.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. First, in FIG. 1, reference numeral 1 denotes an outer box, and an entrance 1a for clothing and the like is formed on the front surface of the outer box, and the entrance 1a is opened and closed by a door 2 having an exhaust port 2a. Reference numeral 3 denotes a rotary drum with a buttful 4 intermittently protruding from its inner circumferential surface. Large diameter cylindrical portions 3a and 3b are formed on both front and rear sides of the drum, respectively, and the front cylindrical portion 3a is connected to the outer box 1. It is fitted and supported via a bearing 6 to an annular support frame 5 fixed around the entrance/exit 1a. 7 is a support frame fixed to the inner surface of the back plate 1b of the outer box 1, 8 is a circular plate fixed to this support frame 7 with screws 9, and the front part of this circular plate 8 is formed in the shape of a circular shallow container. A fixed plate 10 is fixed.
The fixed plate 10 has a front surface slightly bulged to form a spherical protruding surface, and a supporting ring part 10a is formed on the outer peripheral edge, and a cylindrical part at the rear of the rotating drum 3 is attached to the supporting ring part 10a. 3b is rotatably fitted and supported via a bearing 11. The rotary drum 3 whose rear part is supported by the support ring part 10a of the fixed plate 10 in this way has a part of its inner surface, that is, the back surface, formed by the fixed plate 10, and the protruding surface of the fixed plate 10 is formed by the fixed plate 10. The front part protrudes into the rotating drum 3. 12 is a motor fixed to the inner upper surface of the outer box 1, and its rotating shaft 12
A belt 13 for transmitting rotation to the rotating drum 3
The fan 15 of the blower device 14
is attached. Reference numeral 16 designates a fan casing in which the fan 15 is installed, and its suction port 16a is opened into the outer box 1, and a blower duct 17 is extended downward from the discharge port 16b, and its opening end is connected to the circular plate. It is connected to an inflow port 18 formed near the center of 8. Incidentally, an air intake port 20 with a filter 19 is formed at the lower front of the outer box 1. A large number of ventilation holes 21 are formed in the front surface of the fixing plate 10, and a heater 22 is pressed and fixed inside the front surface by a pressing rod 23 provided between the fixing plate 10 and the circular plate 8. Therefore, it is arranged on the side opposite to the rotating drum of the fixed plate 10. Furthermore, a thermoswitch 24 connected to the current conduction path of the heater 22 is attached to the inside of the front surface of the fixed plate 10. Reference numeral 25 denotes a radioactive substance attached to the surface of the fixed plate 10 on the rotating drum 3 side, that is, the front surface, and this radioactive substance 25 is made of, for example, manganese dioxide,
It is a metal oxide made by calcining chromium oxide and iron oxide at about 1200℃ to form a composite oxide (Mn, Fe) (Cr, Fe) ₂ O _4. Figure 2 shows its spectral emissivity. As is clear, it exhibits high emissivity at all wavelengths.

Next, the operation of the above configuration will be explained. When washed clothes are put into the rotating drum 3 and the motor 12 and heater 22 are energized, the motor 12 rotates the rotating drum 3 and the fan 15, and the heater 22 generates steam to heat the fixed plate 10. . At the same time, due to the rotation of the fan 15, outside air is sucked into the outer box 1 through the intake port 20, and further into the fan casing 16, and is blown into the fixed plate 10 through the ventilation duct 17 and the inflow port 18, where the heater 22 and It is heated by the front part of the fixed plate 10 in a heated state and becomes hot air, which immediately blows into the ventilation hole 21.
It flows into the rotating drum 3, removes moisture from the clothes inside, and flows out from the exhaust port 2a of the door 2.

The front surface of the fixed plate 10 is directly heated by the heater 22, and the heat received by the heating is radiated. In this case, the radioactive material 25 is placed on the front surface of the fixed plate 10.
is attached to the fixing plate 10, so that the fixed plate 10 efficiently converts the heat received by the heater 22 into radiant heat energy and releases it into the rotating drum 3. On the other hand, as the rotary drum 3 rotates, the clothes move upward while remaining in contact with the inner circumferential surface of the drum 3, and when they reach a certain height, they fall naturally, repeating the agitation motion. For this reason, a large amount of clothing is distributed on the inner circumferential surface side of the rotating drum 3, and the distribution of clothing in the center is relatively small, which tends to create a space. Clothes exhibiting such a distribution are heated not only by hot air but also by radiant heat emitted from the front surface of the fixed plate 10 as described above, and in particular, clothes located in the center of the rotating drum 3 have a relatively distribution. Because there is a small amount of space, even things near the door 2 receive radiant heat.

By the way, clothing and the like use chemical fibers such as nylon or natural fibers such as cotton and wool as materials. Figure 3 shows the spectral reflectance of nylon, and Figures 4 and 5 show the spectral absorbance of cotton and wool, respectively.As is clear from Figure 3, nylon has a high absorbance at wavelengths of 4 to 6μ. Although it shows the reflectance,
At wavelengths other than that, the reflectance is relatively low.
Furthermore, as is clear from FIGS. 4 and 5, cotton and wool have relatively good absorbance at wavelengths of 2 to 3 μm or more. In general, the lower the reflectance, the better the absorbance and therefore the heat absorption rate, and from the above, it can be said that clothing etc. exhibit relatively good heat absorption rate at wavelengths of 2 μm or more. Therefore, the items to be dried, such as clothes, absorb the radiant heat energy from the fixed plate 10 well, are efficiently heated, and are dried.

Further, during the drying operation as described above, clothes and the like come into contact with the convex front surface of the fixed plate 10, which protrudes into the rotating drum 3. Therefore, when the clothes contain a lot of moisture, the temperature of the front surface of the fixing plate 10 does not rise much, but as the degree of dryness increases, the temperature of the front surface of the fixing plate 10 gradually increases. Then, the thermo switch 24 detects this and turns off the power to the heater 22, and thereafter, when the temperature drops due to this power cut, the heater 22 is energized again. Control the temperature.

Figures 6 to 8 show the spectral emissivity of zirconium oxide (ZrO ₂ ), chromium oxide (Cr ₂ O ₃ ), and titanium oxide (TiO ₂ ), which are also relatively low at all wavelengths. Since these metal oxides have a high emissivity, these metal oxides may be used as the emissive substance 25. In short, any material that has a good emissivity at a wavelength that is easily absorbed by clothing, etc., that is, a wavelength of 2μ or more, may be used. good. In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the front surface of the fixed plate 10 may be formed into a wavelength shape to emit radiant heat in all directions, or a thermoswitch may be used. 24 may be configured to detect the temperature of the exhaust gas from the rotary drum 3 and turn on/off the heater 22, and can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

As is clear from the above description, the present invention consists of a fixed plate that fixes the inner surface such as the back surface of the rotating drum to the outer box side, and the heater is disposed on the opposite side of the rotating drum to the fixed plate. Heated hot air can be immediately flowed into the rotating drum, resulting in extremely little wasteful heat release.Moreover, it is easily absorbed by clothes, etc. on the fixed plate that is heated by the heater.
Because it has a radiant material attached that has good thermal radiation properties at wavelengths of 2 μ or more, it can dry clothes not only with hot air but also with radiant heat, making it extremely effective in utilizing the heat of the heater and improving drying efficiency. be effective.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention,
Figure 1 is a longitudinal sectional view of the whole, Figure 2 is a spectral radiation characteristic diagram of a radioactive substance, Figures 3 to 5 are spectral reflection characteristic diagrams of nylon, cotton, and wool, respectively.
Figures 8 through 8 are spectral radiation characteristic diagrams of different radioactive materials. In the figure, 1 is an outer box, 3 is a rotating drum, 10 is a fixed plate, 14 is a blower, 21 is a ventilation hole, 22 is a heater, and 25 is a radiation material.

Claims (1)

[Claims] 1. An outer box, a rotary drum composed of a fixed plate that is rotatably disposed inside the outer box and whose inner surface such as the back side is fixed to the outer box side, a ventilation hole formed in the fixed plate, and a blowing device that blows air into the rotating drum from the side opposite to the rotating drum of the fixed plate through the pores;
A drum dryer comprising: a heater disposed on the side of the stationary plate opposite to the rotating drum; and a radiant substance that is attached to the surface of the stationary plate on the side of the rotating drum and has good heat radiation at a wavelength of 2 μm or more.