JPH0545280B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dehumidifying type clothes dryer having a heat exchange type blower.

Conventional structure and its problems Conventionally, in a clothes dryer with a built-in heat exchange type blower of this type, as shown in Fig. 1, the heat exchange type blower is installed on the rear surface of the rotating drum 1, and the rotary drum It is known that the hot air discharged from the dryer 1 is guided to one side of the impeller 2 built into the heat exchange type blower, and the air outside the dryer is guided to the other side, thereby exchanging heat between the two. . After heat exchange, the hot air is heated again as circulating air and returned to the rotating drum 1, and the cold air is discharged outside the machine.
At this time, in actual use, the axial thickness of the impeller of a heat exchange type blower is currently made as thin as possible (usually 20 to 40 mm) due to the desire to make the depth of the dryer body as thin as possible. However, in order to efficiently perform heat exchange, which is one of the main purposes of a heat exchange type blower, it is necessary to have a sufficiently large area of the heat transfer surface made up of the blade portion 3 of the impeller shown in Figure 2. The outer diameter of the impeller is increased, and the number of blades 3 is increased as much as possible. Therefore, air inflow path 4 in Fig. 2
The basic problem was that the cross-sectional area of the heat exchange type blower became extremely small, and the blowing function, which was the other purpose of the heat exchange type blower, was significantly reduced.

Purpose of the Invention The clothes dryer of the present invention solves the above-mentioned conventional problems, and at the same time improves the heat exchange efficiency and strengthens the air blowing function, thereby making it possible to dry clothes more efficiently than before. It provides a clothes dryer.

Composition of the Invention The clothes dryer of the present invention includes a drying air path including a rotating drum, a heating element, and a circulating air cylinder, a cooling air path for cooling the circulating air in this drying air path, and a cooling air path provided on the rear surface of the rotating drum. It is equipped with two separate ventilation channels for circulating air and cooling air on both sides, and blows circulating air and cooling air.
and a heat exchange type blower capable of exchanging heat between both air, and the height in the direction of the rotational axis of the blade of the dry air path side surface or both surfaces of the impeller built in the heat exchange type blower is determined by the outer circumference. The inner periphery is higher than that of the rotary drum, and a heat exchange type blower is placed in the recessed part of the rear surface of the rotating drum.
The aim is to increase both the heat exchange efficiency and the air flow rate by increasing the surface area of the blade portion and simultaneously increasing the cross-sectional area of the air inlet portion of the impeller without increasing the overall depth.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Figures 3 to 5, 5 is an impeller of a heat exchange type blower, and 6 is a casing that encloses the impeller 5, which constitutes a part of the ventilation passage on the circulation side and the ventilation passage on the cooling side of the heat exchange type blower. are doing. Reference numeral 7 denotes a rear casing, which together with the casing 6 and the impeller 5 constitutes a ventilation passage on the cooling side of the heat exchange type blower. The ventilation passages on the circulation side and the cooling side are independent. Reference numeral 8 denotes a blade of the impeller 5, which is made of a corrugated thin plate (plastic or metal) forming radial grooves extending outward from the central axis of rotation. heat exchange. Reference numeral 9 indicates an inner peripheral plate that supports the blade 8 from the inside, and reference numeral 10 indicates an outer peripheral plate that similarly supports the blade 8 from the outside. 11 is blade 8
This is the air inflow path at the inner circumference of the In the figure, a,
The arrows marked b indicate air flows on both sides of the impeller 5, respectively. 12 is a motor for driving the dryer, 13 is a heating element for heating air, and 14 is a rotating drum, the rear of which is equipped with the above-mentioned heat exchange type blower. 15 is a circulating wind cylinder.

The operation of the above configuration will be described. When the power is turned on, the motor 12 is operated, and the rotating drum 1 and impeller 5 are rotated via the belt. This creates a flow of circulating air on the side of the impeller 5 facing the rotating drum 1, and a flow of cooling air on the other side. The circulating air flows through the drying air path indicated by the black arrow in FIG. 3, and after being heated by the heating element 13, the water content of the dried material is evaporated within the rotating drum 1. Thereafter, cooling and heating are exchanged with the cooling air through the surface of the blades 8 of the impeller 5, and moisture in the air is condensed, and the drain pipe 16
The water is drained out of the aircraft. The air leaving the impeller 5 is heated again by the heating element 13 and sent to the rotating drum 1. On the other hand, cooling air flows from outside the machine through the intake hole provided in the rear casing 7, cools the circulating air with the blades 8, and then flows out of the machine from the exhaust port 17 through the cooling air path indicated by the white arrow. It is discharged. Drying progresses by repeating the above cycle.

At this time, it is most appropriate to position the heat exchange type blower body at the rear of the rotating drum 14 due to the structure of the dryer. However, from the practical point of view,
There is a desire to make the depth of the dryer body as thin as possible, and if the axial thickness of the impeller is made thinner in this respect, the air blowing capacity of the heat exchange type blower will be significantly reduced as explained in Fig. 2.

On the other hand, if we consider the structure of the rotating drum 14,
Generally, the rear surface of the rotating drum 14 is the rotating drum 1.
Many of them have a structure that protrudes slightly toward the inside. This is for the purpose of preventing the rolling of the material to be dried within the rotary drum 14 and for facilitating the operation of attaching and detaching the filter provided at the rear of the rotary drum 14. Therefore, in the present invention, this rotating drum 14
By paying attention to the structure of the blade 8 and making use of the fact that the back surface of this protruding part forms a substantially conical recess 18, the height of the inner peripheral part of the blade 8 in the rotational axis direction is made higher than that of the outer peripheral part. The cross-sectional area of the air inlet passage is increased and is illustrated in FIGS. 3 to 5. With this configuration, the overall depth is not very large.

The shape of a conventional impeller is shown _by a dashed line in FIG _.
The structure of the impeller 5 according to the present invention is higher than that of the above. FIG. 5 shows the blade 8 viewed from the inner peripheral direction, and the air inflow path 11 is considerably wider than the conventional air inflow path (hatched portion). This greatly increases the amount of air flowing into the blade 8, so
Air blowing capacity can be dramatically improved. Furthermore, since the surface area of the blade 8 also increases, the heat transfer area also increases, and it is clear that the heat exchange efficiency improves.

In the embodiment, the blade 8 has different heights on both sides, but even if only one side on the circulation side is used, a corresponding effect can be exerted compared to the conventional one.

Effects of the Invention As is clear from the above embodiments, after drying clothes according to the present invention, the height in the rotational axis direction of the impeller blade of the heat exchange type blower installed on the rear surface of the rotating drum is lower than that of the inner periphery compared to the outer periphery. By increasing the height, the area of the air inflow path into the blade is increased, thereby achieving a significant improvement in air blowing capacity. Furthermore, the heat exchange efficiency can be improved due to the increased surface area of the blade compared to the conventional method, which has a great effect on improving the performance of clothes dryers.

Additionally, these performance improvements can be achieved without significantly increasing the overall depth of the clothes dryer by placing a heat exchange type blower in the recessed area on the rear surface of the rotating drum. It is also excellent.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional clothes dryer equipped with a heat exchange type blower, Fig. 2 is an external perspective view of the impeller portion of the conventional heat exchange type blower, and Fig. 3 is a clothes dryer according to an embodiment of the present invention. FIG. 4 is a sectional side view of the dryer, FIG. 4 is a sectional view of the impeller, and FIG. 5 is an explanatory developed view of the blade portion of the impeller viewed from the inner peripheral side. 1... Rotating drum, 5... Impeller, 8... Blade, 13... Heating body.

Claims (1)

[Claims] 1. A drying air path including a rotating drum, a heating element, and a circulating air cylinder, a cooling air path for cooling the circulating air in this drying air path, and a cooling air path equipped on the rear surface of the rotating drum, and circulating air and cooling air on both sides. a heat exchange type blower which constitutes independent ventilation passages, blows circulating air and cooling air, and is capable of exchanging heat between both air, and includes a dry air path of an impeller built in the heat exchange type blower. A clothes dryer in which the height of the blades on the side surface or both surfaces in the direction of the rotational axis is made higher at the inner circumference than at the outer circumference, and a heat exchange type blower is disposed using a recessed portion on the rear surface of the rotating drum.