JPS6341600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the dehumidifying type of a rotary drum type clothes dryer, in which an axial gap type (flat type) motor and a circulation blower fan are installed as a drive motor on the rotation center line of the rotary drum. By providing a cooling blower fan and a drum-driven reduction gear mechanism, it is possible to reduce operating noise, which has been a concern in the past, simplify the rotary drive device, and improve durability. The purpose of this is to allow the previously occupied space to be replaced with a large heat exchanger, improving heat exchange efficiency and saving energy.

A conventional dehumidifying type rotary drum type clothes dryer (hereinafter referred to as dryer) is shown in FIG. 31 is an outer casing, 32 is a rotating drum, 33 is a filter, and 34 is a back plate. 35 is a fan case, which is fixed to the body with a bracket 36. 37 is a bearing,
Reference numeral 38 represents a fan shaft, 39 represents a fan holder, and 40 represents a circulating fan. The rotation of the circumferential gap type induction motor 41 is transmitted from the fan drive pulley 42 to the fan pulley 39 via the belt 43, and further transmitted from the fan pulley 39 via the belt 44 to the pulley 46 of the cooling blower fan 45. The power is transmitted from the drive pulley 47 to the belt 48 wound around the outer periphery of the drum 32, and the reduction ratio therebetween is extremely large (approximately 1/36).
The outer diameter of the drum drive pulley 47 is small (about φ15
(~16 mm), belt slip is likely to occur, so in order to keep the belt tension constant and prevent uneven rotation, the idler pulley 49 is stretched by a supporter 50 provided with spring properties.

The air a inside the rotating drum 32 is circulated by the circulation blower fan 4.
0, the air passes through the filter 33, fan case 35, heat exchanger 51, is cooled and dehumidified by the cooling fan 45, and passes through the heater 52 as shown in the figure.
The clothing 5 is heated and blown into the drum 32 again.
The structure is such that drying is carried out in step 3. Furthermore, 54,
55 is a sliding bearing that supports rotation of the rotary drum 32, and 56 is a felt packing.

In this way, in the conventional dryer, the circumferential gap type induction motor 41 is disposed on the lower bottom surface of the outer casing 31.
Generally, the motor 41 rotates the rotary drum 32, circulation fan 40, and cooling fan 45 via pulleys and belts. For example, when rotating the rotating drum 32, generally
In order to reduce the motor rotation speed from 1500 to 18000 rpm to the drum rotation speed of about 50 rpm, which provides good drying efficiency, it is necessary to significantly reduce the diameter of the drive pulley 47 on the motor side (approx. φ15 to 16 mm), which results in a large slip rate. Therefore, an idler pulley 49 is required to increase the tension of the belt 48, which is mechanically complicated and has drawbacks such as increased noise during operation.

In addition, when rotating the fans 40 and 45, the distance between the shafts of the fan drive pulley 42 and the fan pulley 39 becomes long, and the circulation blower fan 40 and the cooling blower fan 45 are rotated at the same time, so the bearing load is large and the bearing load is large. Disadvantages include a relatively short service life and increased noise due to rotational resonance vibration of the belt.

Further, since the induction motor 41 is mounted on the bottom surface of the outer casing 31 and occupies a large area on the bottom surface, it is difficult to increase the size of the dehumidifying heat exchanger 51 to improve its efficiency.

The present invention has been made to improve all of the above-mentioned conventional problems, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a longitudinal cross-sectional view, in which 1 is an outer casing, 2 is a rotating drum (hereinafter referred to as a drum) that rotates around a horizontal axis in the outer casing 1, 3 is a filter installed inside the drum 2, and 4 is a This is a back plate as a rear component of the outer casing 1, and approximately in the center of this back plate 4, a cooling fan case 5, an axial gap type (flat type) is installed sequentially from the rear.
An induction motor 6, a hot air circulation fan case 7, and a drum 2 are arranged on the same rotation axis.
The motor 6 consists of a stator 8 and a rotor 9. The stator 8 is fixed to a partition wall 10 interposed between the fan cases 5 and 7, and the rotor 9 has both shafts. A cooling fan 11 is attached to the fan 11 , and a hot air circulation fan 12 is attached to the shaft inside the circulation fan case 7 , and the shaft end is connected to the input side of a planetary gear reduction device 13 that drives the drum 2 to reduce speed. It is connected to the. The cooling fan 11 takes in outside air (cold air) b from the rear hole 14 provided in the back plate 4 and sends it to the heat exchanger 15 provided at the inner bottom of the outer casing 1 below the drum 2. The air a' containing a large amount of moisture in the rotating drum 2 is indirectly cooled and dehumidified by condensation. At the same time, the motor 6 can be cooled by the outside air sucked in by the cooling fan 11 via the partition wall 10.

In addition, the input side of the planetary gear reduction device 13 is connected to the end of the rotor shaft, and the rotation speed of the motor 6 is approximately
The 1800 rpm is reduced to 1/36, or approximately 50 rpm, and transmitted to the coupling ring 16 attached to the center of the rear surface of the drum 2, and the drum 2 is driven at approximately 50 rpm. Reference numeral 17 is a rotating sliding bearing of the drum 2, and reference numeral 18 is a heater, which heats the circulating air a to dry the clothes 19.

As described above, according to the present invention, by using an axial gap type (flat type) induction motor and a reduction gear device, the conventional belt with high tension is no longer necessary, and the power consumption of the motor is reduced, the sliding noise is reduced,
In addition to improving durability, by locating the axial gap type induction motor, circulation fan, and cooling fan on the rear axis of the drum, the space at the bottom of the outer casing that was previously occupied by the conventional motor and cooling fan is saved. can be occupied by a large heat exchanger, improving heat exchange efficiency and saving energy. Moreover, the motor can be cooled by the outside air sucked in by the cooling fan to the heat exchanger, and overheating of the motor can be prevented, resulting in an extremely useful clothes dryer.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view of a conventional example. 2... Rotating drum, 6... Axial gap type induction motor, 11... Cooling blower fan, 12... Circulating blower fan, 13... Planetary gear reduction device, 15...
Heat exchanger, 16...Cup ring.

Claims (1)

[Claims] 1 A rotating drum that can freely rotate around a horizontal axis is provided in the outer casing, and a heat exchanger for circulating air dehumidification is provided below the rotating drum at the inner bottom of the outer casing, and a heat exchanger for circulating air dehumidification is provided on the rear rotational axis of the rotating drum. An axial gap type (flat type) induction motor having both shafts is installed in the motor, a circulation fan and a reduction gear device for driving the rotating drum are installed on the motor shaft on the rotating drum side of the motor, and a reduction gear device for driving the rotating drum is installed on the motor shaft on the rear side of the motor shaft. A clothes dryer characterized in that a cooling fan is provided at an end of the circulating air dehumidifying heat exchanger.