JP2889724B2 - Clothes dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer.

[0002]

2. Description of the Related Art A clothes dryer of this kind is disclosed in
No. 3555 discloses this. In this apparatus, a motor for rotating a drum is periodically reversed to change the rotation direction of the drum and to loosen tangled clothes in the drum.

[0003]

In the above conventional example,
When the drum is rotated at the same rotation speed to rotate the drum forward and backward, as shown in the graph of FIG. 5, the drying efficiency at the time of normal rotation is lower than the drying efficiency at the time of reverse rotation, and the drying efficiency is poor. There is a drawback that the drying time becomes longer by the minute.

[0004] In order to secure a dry amount by increasing the size of the drum, a motor for rotating the drum in a gap between the frame and the drum is used. It is necessary to arrange parts such as a drying air supply duct, and inevitably a position deviated from a vertical line from the center of the drum along the inner circumference of the drum, for example, FIG.
As shown in the figure, a drying air inlet 17 for supplying drying air into the drum 13 is provided at a corner portion of the machine frame 1.
When the drum 3 rotates in the forward direction, the clothes 47 gather near the drying air inlet 17 and hit the drying air well. When the drum 13 rotates in the reverse direction, the clothes 47 gather in a location away from the drying air inlet 17 so that the drying air is not excessive. This is because the clothes 47 do not dry.

[0005] The present invention solves such a problem.

[0006]

Means for solving the problems of the present invention include a drying drum, a rotary driving device for rotating the drying drum by rotating forward or backward, a lower portion of a front surface of the drying drum and An intake port provided to be deviated in the forward direction along the inner circumference from the bottom of the drying drum, a fan that supplies dry air to the intake port, an exhaust port that exhausts dry air in the drying drum, A rotation speed control device for controlling the rotation driving device so as to increase the rotation speed of the drying drum during the reverse rotation from the rotation during the normal rotation.

[0007]

During the normal rotation of the drying drum, the clothes at the bottom of the drum move and gather near the suction port with the rotation of the drying drum, so that the drying air blown from the suction port hits the clothes well and the drying efficiency is good.

In the reverse rotation, the clothes in the drying drum are frequently thrown from the opposite side of the intake port to the vicinity of the intake port with the rotation of the drum and stirred by an amount corresponding to the increase in the number of revolutions compared to the forward rotation. The dry wind will come evenly,
Drying efficiency is improved.

[0009]

1 to 3, reference numeral 1 denotes a machine frame of a clothes dryer 2, reference numeral 3 denotes a clothing slot provided at the center of the front of the machine frame 1, and reference numeral 4 denotes a machine frame attached to a rear surface of the machine frame 1. Back plate,
Reference numeral 5 denotes a large number of air introduction holes provided at the center of the rear plate 4, and reference numeral 6 denotes an outlet provided at a lower portion of the rear plate 4. 7 is a door for opening and closing the input port 3, 8 is the machine frame 1
An annular drum support plate 9 attached so as to surround the input port 4, a support plate 9 attached to the rear of the machine frame 1 at a distance from the rear face plate 5,
Reference numeral 10 denotes a fan casing fixed to the support plate 9. The fan casing 10 partitions the inside of the machine frame 1 into a drying chamber 11 and a fan chamber 12. 13 is the drying chamber 1
1, a drum of a horizontal axis type, which is supported by the drum support plate 8 via felt or the like with a front opening facing the inlet 4 and a shaft 14 on the rear side.
It is supported rotatably. 15 is a drying air outlet provided at the center of the rear surface of the drum 13;
A lint filter 17 is provided at a position near the right corner of the machine casing 1 below the drum support plate 8 when viewed from the front, that is, a drying air inlet provided at a position shown by a dotted line in FIG.
Reference numeral 18 denotes a communication port provided on the support plate 9 for communicating the drying chamber 11 and the fan chamber 12, and 19 denotes the drying air outlet 1
5 is a seal member for reliably sending the wind from 5 to the communication port 18. Reference numeral 20 denotes a disk-shaped double-sided synthetic resin fan fixed to the shaft 14 in the fan chamber 12. A circulation fan 21 located on the drying chamber 11 side and a cooling fan located on the rear panel 4 side. 22 are formed radially integrally on the front and back. 23 is the double-sided fan 20
A pulley 24 provided at the center of the cooling fan 22 is a synthetic resin partition plate provided on the fan casing 10 so as to surround the double-sided fan 20. This partition plate 2
The double-sided fan 20 is accommodated in a circular opening at the center of 4, and the inside of the fan chamber 10 is divided into a drying air passage 25 and a cooling air passage 26 by the partition plate 24 and the double-sided fan 20.

Reference numeral 27 denotes a group of concentric rotating grooves which are formed integrally with the inner periphery of the double-sided fan 20 and open toward the drying air passage 25, and 28 is formed integrally with the inner peripheral edge of the partition plate 24. It is a group of concentric fixed grooves that open toward the cooling air passage 26. The rotating groove group 27 is loosely fitted in the fixed groove group 28 in a non-contact state. This connection is called labyrinth connection.

A drying duct 29 connects the lower part of the drying air passage 25 and the drying air inlet 17 and is provided at a right corner of the machine frame 1. 30 is the drying duct 29
A drying heater disposed inside, 31 is a drying duct 29
A discharge port for discharging dehumidified water condensed in the drying duct 29 to the outside of the machine, 32 is a drive motor,
33 is attached to the drive motor 32,
A pulley 35 connected to the pulley 23 provided on the drum 13 via a belt 34; a pulley 35 attached to the drive motor 32 and connected to the drum 13 via a belt 36;
8 is an idler. The idlers 37 and 38 pull the belt 36 to prevent the pulley 35 and the drum 13 from slipping with the belt 36. 39 is a thermistor arranged in the drying air passage 25 and near the drying air outlet 15, and 40 is a thermistor arranged in the drying duct 29 and near the drying heater 30.

Although the double-sided fan 20 and the drum 13 are driven to rotate by one of the drive motors 32, the present invention is not limited to this, and the double-sided fan 20 and the drum 13 are separated by separate motors. It may be driven.

Reference numeral 41 denotes a key input unit having a start key, a course change key, and the like; 42, a display unit for displaying a drying operation state; 43, a motor driving unit for rotating the driving motor 32; It is a control unit that controls the operation. The control unit 44 includes a rotation speed control unit 45 that controls the rotation speeds of the drum 13 at the time of normal rotation and at the time of reverse rotation.

The operation will be described with reference to FIG.

After the power is turned on, when a drying course is selected by the key input section 41 and the start key is pressed, the control section 44 receives the signal and turns on the drying heater 30, and furthermore, the rotation number control section 45. Then, the drive motor 32 is rotated so as to keep the rotation speed of the drum 13 at 44 rpm, and the drying operation is started.

At this time, the clothes 47 in the drum 13 are
As described above, the dry air gathers near the drying air inlet 17, that is, on the right side of the drum 13, so that the drying air hits well, and the drying efficiency of the clothes is improved.

Thereafter, 10 seconds after the start of the rotation of the drum 13, the temperature is detected by the thermistors 39 and 40. After a lapse of 5 seconds, the control unit 44 transmits to the drive motor drive unit 43 to stop the drive motor 32 for 1 second, and stops the drum 13 for 1 second.

After the drum 13 is stopped for one second, the drive motor 3
2 is reversed, and the rotation speed is controlled to 51 rpm by the rotation speed control unit 45.
Is transmitted to the motor drive unit 43 to keep the drum 13 in reverse rotation for 15 seconds.

At this time, the clothes 47 in the drum 13 are moved to the opposite side of the drying air inlet 17 with the rotation of the drum 13, that is, to the left as shown in FIG. Further, centrifugal force acts on the clothes 47 in the drum 13 and the drum 1
3 spreads along the inner surface, one end of which reaches the vicinity of the drying air inlet 17, and rotates as the drum 13 rotates.
The clothes 47 at the upper left of the clothes 3 are thrown out near the drying air inlet 17, and the clothes 47 are sequentially hit by the drying air.

After the normal rotation reversal operation of the drum 13 is continued for 15 minutes, the control unit 44 calculates a drying end temperature difference from the temperature difference between the thermistors 39 and 40 measured during the normal rotation of the drum 13. Thereafter, until the temperature difference between the thermistors 39 and 40 reaches the drying end temperature difference obtained by calculation, the control unit 44 continues the above-described normal rotation reversal operation of the drum 13.

When the temperature difference between the thermistors 39 and 40 reaches the drying end temperature difference, the rotation operation of the drum 13 is continued as it is, and the process shifts to a cool-down step in which only the drying heater 30 is turned off. End the operation.

In this embodiment, the higher the rotation speed of the drum 13 in the reverse rotation, that is, the right rotation, the higher the rotation speed is not necessarily better.
Exceeds about 52 rpm), the drying efficiency decreases.

This is because if the rotation speed of the drum 13 is too fast, the clothes in the drum 13 stick to the inner surface of the drum 13 due to the centrifugal force and start to rotate together with the drum 13, so that the clothes are not thrown out. This is because the dry air introduced from the air inlet 17 does not evenly hit the clothes.

[0024]

According to the present invention, the total drying efficiency can be improved and the drying time can be reduced by eliminating the difference in drying efficiency between the normal rotation and the reverse rotation of the drying drum.

[Brief description of the drawings]

FIG. 1 is a front view of a clothes dryer according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a control block diagram of the clothes dryer.

FIG. 4 is a diagram showing an operation flowchart of the clothes dryer of the present invention.

FIG. 5 is a diagram showing a relationship between a drum rotation speed and a drying efficiency.

FIG. 6 is a diagram illustrating a state inside the drum when the drum is rotated counterclockwise.

FIG. 7 is a diagram showing a state inside the drum when the drum is rotated clockwise.

[Explanation of symbols]

 13 Drum (drying drum) 15 Dry air outlet (exhaust port) 17 Dry air inlet (inlet port) 20 Double-sided fan (fan) 32 Drive motor (rotary drive unit) 46 Revolution control unit (revolution control unit)

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Tanaka 2-18 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (56) References JP-A-61-268300 (JP, A) JP-A-4-241898 (JP, A) JP-A-3-143499 (JP, A) JP-A-58-149796 (JP, A) JP-A-58-141196 (JP, A) JP-A-58-91398 (JP, U) 1984-98896 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) D06F 58 / 02,58 / 28

Claims (1)

(57) [Claims] 1. A drying drum, a rotation driving device for rotating the drying drum in a forward or reverse direction, and a bias in a forward direction at a lower front portion of the drying drum and along an inner circumference from a bottom portion of the drying drum. And a fan for supplying dry air to the intake port, an exhaust port for exhausting the dry air in the drying drum, and increasing the number of rotations of the drying drum at the time of reverse rotation from the time of normal rotation. A clothes dryer comprising: a rotation speed control device that controls the rotation drive device.