JPS58192591A - Rotary drum type garment 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 The present invention relates to a rotary drum type clothes dryer, which prevents the occurrence of cavitation by intermittently driving the rotary drum to rotate at least in the latter half of the drying operation, and prevents the occurrence of cavitation even if it occurs. This was designed to solve the problem in a short time and improve drying efficiency.

First, this type of clothes dryer will be explained with reference to the principle diagram shown in FIG. In FIG. 1, reference numeral 1 denotes clothes to be dried, 2 a rotating drum that stores the clothes 1, 3 a fan for blowing air into the drum 2, and 4 the rotating drum 2 and fan 3.
5 is a heater that heats intake air to turn it into hot air; 6 is an arrow indicating the flow of intake air (which has the same temperature as the ambient temperature outside the machine); 7 is an arrow indicating the flow of intake air before it contributes to drying. Arrows 8 indicate the flow of hot air, and arrow 8 indicates the flow of hot air that has contributed to drying, i.e., the flow of exhaust air.The drying operation of the clothes 1 is performed by bringing the clothes 1 into contact with the hot air while loosening the clothes 1 by rotating the rotating drum 20 times. It is something.

Therefore, in such a dryer, if the rotational speed of the rotating drum 2 is set too low, the clothes 1, which are heavy due to moisture, may slip or roll on the inner surface of the rotating drum 2 as it rotates. Therefore, the rotation speed of the rotary drum 2 is set to a certain high speed to lift the clothes 1 upward. It is necessary to lift it up and allow it to fall a long distance so that it can be loosened sufficiently.

However, when the rotational speed of the rotating drum 2 is set to a high speed as described above, when the amount of water contained in the clothing 1 decreases due to the progress of drying and the clothing 1 becomes lighter in weight, the clothing 1 does not fall, as shown in the second figure. There is a risk of causing a so-called hollow phenomenon in which the clothing 1 clings to the inner surface of the rotating drum 2 and the hot air passes through the center of the drum. However, the exhaust gas temperature would rise rapidly and the drying efficiency would decrease.

The present invention has been made in view of this point, and by rotating the rotating drum intermittently at least in the latter half of the drying operation, it is possible to prevent the occurrence of cavitation, and to eliminate it in a short time even if it occurs. , the drying efficiency can be improved.

The embodiment of the present invention shown in FIG. 3 will be explained in detail below. In FIG. 3, parts common to those in FIG. 1 are given the same reference numerals.

9 is a commercial power supply; 10 is a drying operation timer; a first timer contact 10' that turns ON when a time limit is set and turns OFF when the set time period ends; and a second timer contact 10' that turns ON when a time limit is set and turns OFF five minutes before the end of the set time period. The timer motor 10 consists of a timer contact 10# and a timer motor 101.
1 is connected between both terminals of the commercial power supply 9 via a timer contact 10', and is connected in parallel to a series circuit consisting of a timer contact 10#, a heater 5, and a relay contact 11.

Further, a motor 4 is connected in parallel to the series circuit consisting of a timer contact 10" and a heater 5. 11' beam relay contact 11
It is a relay coil for operating the.

The + side of 12 is connected to one terminal of the commercial power supply 9 via a resistor 13 and a diode 14 in series, and the - side is connected to the 1iio* power.

4 Yaka 4□□7. A7 1.5 The voltage regulator diode is connected in parallel to the capacitor 12 via the resistor 16, and the resistor 16 regulates the DC voltage rectified and smoothed by the diode 14, resistor 13, and capacitor 12. Convert to voltage.

A rectangular wave oscillator 17 connects a VDD terminal to the cathode and a GND terminal to the anode of the constant voltage diode 15, and generates a signal as shown in the fourth figure at its output terminal. 18 is a counter IC which connects a VDD terminal to the cathode of the constant voltage diode 15, a GND terminal to the anode thereof, and connects a clock input terminal to the output terminal of the rectangular wave oscillator 17; When a signal is input, the output terminal outputs an output that is a fraction of the clock input as shown in Figure 5, and the output signal changes from L to H once every few minutes, for example, 5 minutes.
Changes to This counter ICl3 has a reset terminal connected to the cathode side of the voltage regulator diode 15 through a capacitor 19, and to the anode side of the voltage regulator diode 15 through a resistor 20 and a diode 21, so that the input of the reset terminal becomes H level. It has the ability to reset the state of the counter to zero by turning it.

22. 23 is a CMO8 NOR gate IC, and this NOR gate IC22 has its first input terminal as the output terminal of the counter ICl3, and its second input terminal as the NOR gate)
The output terminal of IC23 is connected to the first input terminal of NOR gate IC23 via capacitor 24 and resistor 25, and these NOR gate IC22, 23
, capacitor 24, resistors 25, 26, etc. constitute a monostable multi-pipe rake. This monostable multivibrator is a NOR gate) When the voltage at the first input terminal of IC22 goes from L level to H level, the voltage at the output terminal of NOR gate IC23 goes to H level for a certain period of time, for example, 5 seconds, and then returns to L level again. It is something.

27 connects the gate to the NOR gate IC 23 via the resistor 28
Connect to the output terminal of the
NOR
When the output voltage of gate IC23 is at H level, O
A capacitor 32 is connected in parallel to the relay coil 11'.

In this embodiment having the above circuit configuration, the rotation of the rotating drum 2 is stopped for 5 seconds once every 5 minutes, and the rotating drum 2 rotates for 4 minutes and 55 seconds during the drying operation.
It rotates intermittently with a 5 second stop period.

Next, its effect will be explained. Now, when the clothes 1 are placed in the rotating drum 2 and the drying operation timer 10 is set to the desired drying time, the first and second timer contacts 10', 1
0'' is ONt, and the timer motor 10'', motor 4 and heater 5 are energized.

Then, the drying operation timer 10 starts a timing operation by driving the timer motor 101, while the rotating drum 2 rotates to loosen the clothes 1, and the hot air generated by the heater 4 and fan 3 enters the rotating drum 2. After contacting the clothes 1, the air is exhausted and a drying operation is performed.

During such a drying operation, the counter ICl3 changes its output signal from L level to H level once every 5 minutes. Then, an H level signal enters the input terminal of the NOR game IC22, and each time the output signal of the NOR game IC23 goes to the H level for 5 seconds, during which time the 5CR27
By turning on the relay coil 11' and turning off the relay contact 11, the heater 5 and motor 4 are turned on.
The energization is stopped, and the rotation of the rotating drum 2 is stopped.

That is, during the drying operation, the rotating drum 2 stops rotating for 5 seconds once every 5 minutes. Of course, when 5 seconds pass and the output signal of the NOR gate IC 23 changes to the low level, the 5CR 27 becomes OFF again and stops energizing the relay coil 11', and by turning on the relay contact 11, the heater 5 and The motor 4 is energized to restart the supply of hot air and the rotation of the rotating drum 2.
- Therefore, if the clothes 1 being dried tend to stick to the inner surface of the rotating drum 2, or if the clothes 1 tend to stick to the inner surface of the rotating drum 2, causing a cavity phenomenon, the rotating drum 2 By stopping periodically, the garment 1 is allowed to fall downward, and the next rotation starts loosening the garment 1 again.
The occurrence of cavitation due to the clothing 1 sticking to the edges is prevented as much as possible, and even if it occurs, the drying operation does not have to continue for a long time until the end and is resolved in a short time, improving drying efficiency. do.

The drying operation is performed as described above, and as time progresses, the second timer contact 10'' is turned OFF five minutes before the end of the set time of the drying operation timer 10, and the power supply to the heater 5 is stopped. Then, when the set time period ends, the first timer contact 10' is also turned OFF, and the motor 4 is turned off.
, the power supply to the timer motor 10'' is stopped, and the drying operation of the clothes 1 is completed.

In the above-mentioned embodiment, the rotating drum is driven to rotate intermittently during the drying operation, but the cavitation phenomenon occurs as the drying progresses and the amount of moisture contained in the clothing 1 decreases and the weight becomes lighter. If the rotary drum is driven to rotate intermittently at least in the latter half of the drying operation using a timer or the like, substantially the same effect can be expected.

As described above, in the rotary drum type clothes dryer of the present invention, by intermittently driving the rotary drum to rotate at least in the latter half of the drying operation, it is possible to prevent the occurrence of cavitation, and even if it occurs, for a short period of time. This problem can be solved and the drying efficiency can be improved, which is extremely useful for practical use.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of a rotary drum type clothes dryer, Fig. 2 is a diagram explaining the cavity phenomenon, Fig. 3 is an electric circuit diagram of the rotary drum type clothes dryer of the present invention, and Fig. 4 is a rectangular wave oscillator. Output waveform diagram, Figure 5 is the same counter IC as above.
FIG. 1: Clothes, 2: Rotating drum, 3: Fan, 4: Motor,
5: Heater, 10: Drying operation timer, 11: Relay contact, 11': Relay coil, 18: Counter IC
, 22 and 23: NOR, - IC, 27: SCR.

Claims (1)

[Scope of Claims] 1. In a device that dries clothes with hot air while loosening them by rotating a rotating drum, and automatically stops the drying operation, the rotating drum is intermittently operated at least in the later stages of the drying operation. A rotary drum type clothes dryer characterized by rotational drive. 2. The rotary drum type clothes dryer according to claim 1, wherein the rotary drum is intermittently driven to rotate at a cycle of rotating for several minutes and stopping for several seconds.