JPS58165899A - Clothing drier - 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 The present invention relates to an improvement in a clothes dryer having a rotatable cylindrical drum.

In line with the trend toward thinner clothes dryers that reduce the depth, efforts are being made to reduce the axial length of the drum.

A 20cm drum with a diameter of 55 crn and a depth of 32 crn.
When we reduced the volume of the drum by increasing the depth to

When we investigated this, we found that the material to be dried that had been scraped up by the stirring protrusions of the drum did not fall off, but instead remained attached to the drum as it rotated. A conventional drum has three or four stirring protrusions, and FIG. 2 shows an example of a drum having three stirring protrusions. That is, most of the material 20 to be dried contained in the drum 1 is held between the stirring protrusions 30 at the bottom. When the drum 1 rotates at a speed of 42 to 52 times/minute, centrifugal force is applied to the clamping, and even if the dried material 2 reaches the upper part, it does not fall. It remains attached to drum 1 and rotates once. Air flows in from the air inlet 4,
The heated air flowing through the outlet 5 of the filter guard only touches the surface of the object 2 to be dried as shown in the figure, and dries not only the inside of the object 2 but also the portion iA, which is in close contact with the drum 3. It is not possible. This problem tends to occur when there is a large amount of material to be dried, and it has been unavoidable to run the clothes dryer for a long time to deal with it.

The present invention addresses the above-mentioned drawbacks and aims to provide a clothes dryer in which the items to be dried do not follow the drum while being held between the stirring protrusions.

The present invention solves the above-mentioned drawbacks by an extremely simple method of increasing the number of stirring protrusions so that the pitch is 30e' to 72°.

Embodiments of the present invention will be described below with reference to FIGS. 1, 3, and 4.

As shown in FIG. 1, the outer frame 6 has a box shape.

The drum 7 has a cylindrical shape and is rotatably supported inside the outer frame 6. A stirring protrusion 8 is provided on the inner circumference of the drum 7.
As shown in FIG. 3, six are provided at a pitch of 60°. The number of stirring protrusions 8 is 60° as will be described later.
The best performance is obtained in the case of pitch, but 30" to 72"
If the pitch is within the range of .degree., practically satisfactory performance can be obtained.

The stirring protrusion 8 may be made separately from the cylindrical portion of the drum 7 and attached thereto, or may be formed integrally with the cylindrical portion by pressing. This stirring protrusion 8 extends in the axial direction over the entire range from the front side to the rear side of the drum 7.

The shape of the stirring protrusion 8 is the same as that of the conventional one. The height of the drum 7 from the inner peripheral surface is 50 degrees.

As a result of experiments, satisfactory characteristics were obtained with 20W11 to 50W.

The front bearing part 9 supports the front side part of the drum 7, and is attached to the front cover 10. The front cover 10 has a substantially U-shaped cross section and is attached to the front inner surface of the outer frame 6. A cylindrical door boat 11 is attached to the center of the front cover 10, and this door boat 11 serves as an input port for loading and unloading the material 12 to be dried. A door 13 that closes the input port is attached to the outer frame 6 with a hinge 14.

A donut-shaped space is formed by the front cover 10 and the outer frame 6. A PTC heater 15 is provided in the heating chamber 14 which is this space. The p'rc heater 15 is placed below the heating chamber 14.

An air inlet 16 for introducing heated air into the drum 1 is formed at the front cover 10 facing the PTC heater 15.

As shown in FIG. 3, the air inlet 16 is positioned so as to face the lower front ti+++ surface of the drum 7, and is provided in a fan shape. The upper part of the air inlet 16 is aligned with the peak of the stirring protrusion 8 formed on the drum 1.

An intake port 17 is formed at the bottom of the heating chamber 14 . Air entering from the intake port 17 is heated by the PTC heater 15 and enters the drum 7 through the air inlet 16.

The rear side of the drum 7 is rotatably supported by a rear bearing section 18. The rear bearing portion 18 is supported by a support base 20 formed in the exhaust duct 19. The upper end of the exhaust duct 19 protrudes from the upper part of the outer frame 6.

A filter guard 21 is attached to the inner rear center of the drum 7. The filter guard 21 has an outlet 2
2 is formed. A net filter 23 is attached to the back of the filter 21. A discharge port 24 is formed on the rear surface of the drum 7 facing the net filter 23.

An electric motor 25 is provided at the inner upper part of the outer frame 6. A centrifugal fan 26 is attached to the front rotating shaft of the electric motor 25. The centrifugal fan 26 is positioned such that the outer periphery of the centrifugal fan 26 faces the air intake port 17 of the heating chamber 14 . Also, the outer frame 6 facing the front side of the centrifugal fan 26
An outside air intake opening 27 is formed in the area, and a filter 29 is attached to this outside air intake opening 27 with a filter guard 28.

A pulley 30 is attached to the rear rotating shaft of the electric motor 25. A belt 3 is placed around this pulley 30 and drum 7.
It is multiplied by 1. A tension pulley 32 is pressed against the belt 31.

A timer switch 33 for controlling the electric motor 25 and the P'rC heater 15 is attached to the upper front surface of the outer frame 6.

In the clothes dryer having the above configuration, the timer switch 33
When set, the clothes dryer will start operating. That is, as the electric motor 25 rotates, the drum 7 is rotated via the belt 31, and the centrifugal fan 27 also rotates.

The outside air passes through the filter 29 and is drawn into the centrifugal fan 27 from the outside air intake port 27, and further enters the heating chamber 14 from the air intake port 17. Here, the air is P 'I"C
The air is heated by the heater 15, enters the drum 7 through the air inlet 16, dries the material to be dried 12, and is then discharged from the drum 7 to the exhaust duct 19 through the outlet 22 and outlet 24 of the filter guard 21. be done. The air containing moisture is then exhausted to the outside of the outer frame 6 through the exhaust duct 19.

In this operation, the material to be dried 12 is scraped up by the stirring protrusion 8, and when it reaches a certain height, it falls naturally, and this process is repeated. This is because the material 12 to be dried remains attached to the drum 7 and does not rotate together with the drum 7. That's why drying is often done.

The reason why the material to be dried 12 does not rotate while attached to the drum 7 is probably because the number of stirring protrusions 8 is increased, so that it becomes difficult for the material to be dried 12 to be held between the stirring protrusions 8. It will be done. As shown in FIG. 3, the material to be dried 12 is suspended from the inner circumferential surface of the drum 7 compared to that in FIG. The surface also runs. For this reason, the amount of heated air that comes into contact with the material to be dried 12 is increased, so that drying is carried out more efficiently.

Furthermore, since the air inlet 16 is configured to coincide with the top of the stirring protrusion 8, the heated air blown out from the air inlet 16 blows up the material to be dried 12. This improves drying efficiency by 5% to 6%.

FIG. 4 is a graph showing the drying efficiency and drying time measured by changing the spacing between the stirring protrusions 8.

The best results were obtained when the stirring protrusion 8 was set at 60°. A indicates the range where the material to be dried 12 is likely to be pinched;
The drying efficiency in the jammed state is η'. It can be seen that the drying efficiency is worse than that in which no jamming occurs. When the angle of the stirring protrusion 8 is in the range of 30° to 72°, clogging does not occur and a practically usable drying efficiency can be obtained.

The test shown in FIG. 4 was conducted under the following conditions.

(1) Size of drum 7: diameter 55tM + depth 2
(2) Stirring protrusions: height 50cm (3) Drum rotation speed: 42 to 52 times/min or more As described above, the present invention has a plurality of stirring protrusions formed on the inner peripheral surface of the drum. By making the pitch between ° and 72 °,
Since the material to be dried is not caught between the stirring protrusions, extremely good drying can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a clothes dryer, Fig. 2 is an explanatory diagram of the operation of a conventional clothes dryer, Fig. 3 is an explanatory diagram of the operation of the clothes dryer of the present invention, and Fig. 4 is a pitch of stirring protrusions. A graph showing the drying efficiency measured by changing the Bamboo shoots (10)

Claims (1)

[Claims] 1. A rotatable cylindrical drum, a blowing means for passing heated air through the drum, and an electric motor for rotating the drum;
A clothes dryer consisting of a plurality of stirring protrusions formed on the inner peripheral surface of the drum so as to extend in the axial direction of the drum, characterized in that the pitch of the stirring protrusions is 30° to 72°. . 2. In the product described in claim 1, the air inlet is provided to face the side surface of the drum, the height of the stirring protrusion is set to 20 cm to 50 cm, and the air inlet is set to the height of the stirring protrusion. A clothes dryer characterized in that the tops of the clothes dryer are made to coincide with each other.