JPS59228895A - Clothing dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a drum-type clothes dryer having an electric heater and an infrared heater as heat sources.

Conventional structure and problems Conventionally, clothes dryers heat drying air using an electric heater such as a nichrome heater or a semiconductor heater with positive temperature characteristics as a heat source, and use this hot air to store clothes and rotate them. A common method is to supply the material to a drying drum and dry it. This method uses an indirect heating method in which the heat generated by the electric heater is transferred to the drying air, and then heat is transferred between the high-temperature drying air and the clothes to heat the moisture contained in the clothes and dry them. As a result, heat radiation loss and heat transfer loss are large, and the effective amount of heat transferred to the moisture contained in the clothing is small relative to the input electrical energy, resulting in poor heat exchange efficiency.

Recently, in order to improve heat exchange efficiency, infrared heaters that emit infrared rays that directly heat clothing without heating the air have been considered. However, with this method, only the areas that are exposed to infrared rays are heated, so the temperature of the clothing may rise abnormally in some areas. There was a problem. In addition, in a drum-type clothes dryer, the clothes swell in the late stage of drying, so that almost no transmission of power through the clothes can be expected. This means that infrared rays are constantly being applied to specific areas of clothing, causing localized abnormal heating, which inevitably causes the clothing to shrink or burn.

OBJECTS OF THE INVENTION The present invention solves these problems and provides a clothes dryer with good drying efficiency.

Structure of the Invention The clothes dryer of the present invention includes a drum that stores clothes and rotates within the dryer body, a blower that guides drying air into the drum, a heat source for drying the items to be dried, and drives the drum and the blower. The heat source includes an electric heater and an infrared heater.

This configuration allows clothing to be efficiently heated using hot air and infrared rays.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is the main body of the dryer, 2 is a drum rotatably provided within the main body 1 of the dryer and driven by an electric motor 3 via a drum belt 4, and 5 is a drum provided on the front of the main body 1 of the dryer. The clothes input port 6 is a heat source for heating the drying air sent into the drum 2, and is an electric heater such as a nichrome heater or a semiconductor heater.

Reference numeral 7 denotes an impeller of a heat exchange type blower provided on the back side of the dryer main body 1, and is driven by an electric motor 3 via fan bells 1 and 8. Reference numeral 9 denotes a casing of a heat exchange type blower, which is provided facing the rear surface of the drum 2, and has a drying air intake port 10 in the center. 11 is a filter installed on the rear surface of the drum 2 to remove lint, etc., and 12 is an infrared heater also installed on the rear surface of the drum 2. 13 and 14 are swirl chambers on the drying air side and cooling air side, respectively, and 16 is a drum holder that holds the impeller 7 and the casing 9. Reference numerals 16 and 17 indicate an intake port and an exhaust port provided on the back plate 18. Reference numeral 19 denotes a circulation duct, which functions as a ventilation path that connects the casing 9 and the intake side of the electric heater 6. 2
0 is a water port through which water condensed by heat exchange in the impeller 7 is discharged. 21 is a temperature sensor consisting of a thermistor or the like. 22 represents infrared radiation; 23
．． 24 indicate the flows of drying air and cooling air, respectively.

The operation of the clothes dryer configured as described above will be explained below. When the power is turned on, the electric motor 3
is driven, the drum 2 containing clothes rotates, and the impeller 7 of the heat exchange type blower rotates. Also, the electric heater 6 and the infrared heater 12 are energized. The surface of the clothes inside the drum 2 is efficiently heated by the radiation from the infrared heater 12, and the clothes are heated from inside by the drying air heated by the electric heater 6, and the moisture in the clothes is rapidly evaporated due to the synergistic effect. As a result, the drying air, which has become hot and humid, is taken into the impeller 7 through the drying air intake port 10, and at the same time, the cooling air is taken into the opposite side of the impeller 7 through the intake port 16, and the impeller 70 blades are taken in. Partly, heat is exchanged between the two. At this time, the drying air is cooled and condensed, and the condensed water is transferred to the drying rack main body 1
Expelled outside. The air dehumidified by condensation is sent through the circulation duct 19 to the electric heater 6, where it is heated again and guided into the drum 2, and the drying air is circulated. On the other hand, the cooling air undergoes heat exchange with the impeller 7, is heated, and is then exhausted to the outside of the machine through the exhaust port 17.

Here, infrared rays can heat objects by direct radiation, and the heating efficiency is good, but only the surface of the irradiated area is heated, and the areas in the shadow and inside are not heated. There is. In order to compensate for this drawback, the clothes dryer according to the embodiment of the present invention described above uses an electric heater 6 as an auxiliary heating source, and heats the surface of the clothes with infrared rays while heating the drying air with the electric heater 6. By supplying this to clothing, it can quickly heat areas not exposed to infrared rays or the inside of clothing, and the synergistic effect of these can improve drying speed and efficiency.

In addition, in a drum-type clothes dryer, the clothes swell in the latter stages of the drying process, and the drying process must be performed once in synchronization with the drum, making it impossible to expect the clothes to be transferred. For this reason, infrared rays always irradiate the same place on the same clothing9, resulting in abnormal local heating, which inevitably causes the clothing to shrink or burn. Therefore, in the clothes dryer according to the embodiment of the present invention, the temperature rise that appears in the latter half of the drying process is detected by the temperature sensor 21, and the infrared heater 12 is opened in the latter half of the drying process, so that drying is performed only by the electric heater 6. It consists of In the latter stages of the drying process, the amount of moisture contained in the clothes is small, so there is no need for a large amount of heat as in the early stages; on the other hand, a large amount of heat can cause the temperature inside the drum to rise abnormally and cause the fabric to become stale. Therefore, only the electric heater 6 is sufficient in the latter half of the drying process. Therefore, according to the embodiment of the present invention, abnormal heating due to poor transfer of clothing can be prevented, and
It is possible to limit the input in the latter half of the drying process and to perform drying efficiently.

In this actual case, in order to open the infrared heater 12, the temperature sensor 21 detected that it was in the late drying stage.
The electrodes may be provided in the drum by detecting the resistance value between the electrodes, or may be performed in conjunction with a timer or the like.

FIGS. 2 and 3 show other examples, and FIG. 2 shows an infrared heater 12 installed in the clothing input port 6'.
In FIG. 3, a rod-shaped infrared heater 12 is installed along the drum center axis from the rear surface of the drum. According to the configurations shown in FIGS. 2 and 3, it becomes possible to radiate infrared rays more effectively. In the figure, parts that are the same as those in FIG. 1 are designated by the same reference numerals and explanations are omitted.

Effects of the Invention As described above, according to the present invention, by providing a drum-type clothes dryer with an electric heater and an infrared heater, clothes can be efficiently and rapidly heated, thereby increasing drying efficiency. It is possible to realize a clothes dryer that takes less time, and by opening the infrared heater and closing the electric heater in the latter half of the drying process as in the example, it is highly reliable and eliminates the problem of localized abnormal heating of clothes. It is possible to provide a clothes dryer.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a clothes dryer showing one embodiment of the present invention, and FIGS. 2 and 3 are side sectional views of a clothes dryer showing other embodiments 19ij, respectively. 2...Drum, 3...Electric motor, 6...
...Electric heater, 12...Infrared heater. Name of agent: Patent attorney Toshio Nakao and one other person55 Figure 1 Figure 2

Claims (2)

[Claims] (1) A drum rotatably supported within the dryer body,
It is equipped with a blower that introduces drying air into the drum, a heat source for drying objects to be dried, and an electric motor that drives the drum and the blower, and the heat source includes an electric heater such as a nichrome heater or a semiconductor heater, and an infrared heater. A clothes dryer consisting of: (2) The clothes dryer according to claim 1, wherein the infrared heater is opened and the electric heater is closed in the latter half of the drying process.