JPS612899A - Clothing 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] [Field of Application of the Invention] The present invention relates to a clothes dryer, and in particular, improves the control circuit thereof, thereby allowing parts for domestic use and export use to be shared. The present invention relates to a clothes dryer having a configuration suitable for achieving high and low voltage switching.

[Background of the invention]

When switching between high and low voltage in a clothes dryer, conventional heaters are /-Z heaters, so in order to keep the amount of heat generated by the /-Z heater approximately constant at both high and low voltages, it is necessary to There is a method of switching the heaters in series and parallel, but this method requires the heater to be divided into a plurality of parts, resulting in a complicated and expensive structure, and has the disadvantage that it cannot be easily switched.

However, in export regions where the voltage is different, in order to obtain a constant amount of heat according to each rated voltage, it is necessary to use a heater with a different resistance value (the same applies to chrome heaters) in regions where the voltage is different. , the disadvantage is that it is difficult to share parts.

[Purpose of the invention]

In view of the above-mentioned drawbacks, the present invention makes it possible to switch between high and low voltages using a small-capacity transformer, and the heater capacity does not change even if the voltage varies slightly depending on the region.1. The purpose is to provide a clothes dryer that can.

[Summary of the invention]

The clothes dryer according to the present invention includes a rotatable drum for drying clothes, a blower fan that blows air into the drum, a motor that drives the blower fan, and a motor that heats the air that enters the tram. In a clothes dryer consisting of a heater and a timer that controls the operating time of these motors and heaters, the heater is commonly used in a voltage range that is twice or half the rated voltage, and is operated at a predetermined air volume. This is a semiconductor heater that can generate a roughly constant amount of heat.

As a further supplement, the present invention uses a semiconductor heater with positive characteristics in which the amount of heat generated by the heater is approximately constant even under a voltage twice (or half) the rated voltage as long as the air volume is constant. By doing so, by sharing the heater and switching between the timer motor and the motor using a transformer, we can solve the aforementioned drawbacks of switching between high and low voltages in clothes dryers, and we hope to improve the world's The same amount of heat is generated in all regions using a single type of heater.

[Embodiments of the invention]

An embodiment of the clothes dryer according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic vertical cross-sectional view of a clothes dryer according to an embodiment of the present invention, FIG. 3 and 4 are control circuit diagrams when using a high voltage, and FIGS. 5 and 6 are sub-side circuit diagrams when using a low voltage.

1 is a door switch, 2 is a heater related to a semiconductor heater, 3 is a motor that drives a fan 8 related to an air blower, 4 is a transformer, and 5 and 6 are heaters 2. Cam switch A in the timer 7 that controls the operating time of the motor 3
+ 13 s 7 a is a timer motor related to the timer 7, 9 is an intake port, 10 is a rotating drum for drying clothes, 10a is a drum support, 11 is an exhaust port, 12
is the connector, and 13 is the back cover.

That is, in FIG. 1, the heater 2, which is a semiconductor heater having a positive resistance characteristic and which is the central structure of the present invention, is fixed within the drum support 10a.

Due to the rotation of the blower 8 driven by the motor 3, air enters from the intake port 9 as shown by the arrow, passes through the heater 2, becomes hot air, enters the drum 10, and exchanges heat with the clothes. The heaters used in clothes dryers can be broadly classified into N1-Cr heaters, /-Z heaters, and semiconductor heaters. .

When making products with different voltages, under any voltage,
Normally, the amount of heat generated is kept constant and the drying time is the same.For this purpose, in the case of N i -(': r line, By doing so, the resistance value is changed to obtain the same amount of heat generation.

Even with conventional semiconductor heaters, the usable range is approximately ±15% of the rated voltage.
This resulted in the problem of reduced manpower.

The semiconductor heaters having positive characteristic resistance used in the embodiments of the present invention are La and Y.

It is a ceramic mainly composed of lithium titanate and 3n mixed with small amounts of PB, etc., but by selecting this mixing ratio appropriately, it can withstand heat 1 / cock due to overvoltage and can be made as shown in Figure 2. As shown, the heater power required for voltage fluctuations is lower than that of the conventional product (A).

8 curve), the change is significantly smaller (C curve).

Note that FIG. 2 is a curve in which the amount of air passing through the semiconductor heater is constant.

In the device according to the present invention, by utilizing the characteristics of this C curve and using it in the heater of a clothes dryer, approximately 10
Within the voltage range of approximately twice the rated voltage from 0■ to 220■, in short, a voltage range that is twice or half the rated voltage is commonly used, and a constant amount of heat can be obtained at a given air volume. It can be covered with a heater.

As a result, single-phase AC 100V to 240V
However, by simply changing only the electric parts such as the motor and timer, it is possible to obtain a clothes dryer with approximately the same calorific value, and it is possible to significantly standardize the parts.

Figures 3 to 6 show that the same motor and timer motor are used, ensuring a constant amount of heat at low voltage (100 to 120 V) and high voltage (200 to 240 V) with the same clothes dryer. The timer motor and the motor can be switched by a transformer, making it possible to use both low and high voltages.

If the working voltage of the motor and timer motor and the power supply voltage match, connect the motor and timer motor to the power supply without passing through the wires. Sometimes, the motor and timer motor are connected to the power supply via a transformer, and the heater with the C curve characteristic described earlier is connected to the power supply without going through the transformer, regardless of whether the power supply voltage is high or low. It has been made possible.

As mentioned above, 1 becomes 0 when the door of the clothes dryer is opened and closed.
4 is a transformer attached to the rear of the main body; 5.6 is a timer cam switch A; cam switch B; 7a is a timer motor related to the timer 7; is drying drum 1
0 and the fan 8.

First, we will explain the case when high voltage is used.

In FIG. 3.4, the heater 2 is a semiconductor heater with a C curve characteristic indicated by iTJ, and is connected in parallel to the power supply.

The timer motor 7a and the motor lJj, ) are connected to each other via a lance 4), and are configured to operate at a predetermined low voltage.

When the clothes dryer is about to start operating, the cam switch B6 is opened a few minutes before the end time of the timer cent, air drying starts without electricity being applied to the heater 2, and then the cam switch A5 is opened and the drying operation starts. finish.

As shown in FIG. 1, the transformer 4 can be easily connected to the connector 12 using a plug-in terminal or the like, and when the voltage is low, it becomes K as shown in FIGS. 5 and 6.

Two heaters, as mentioned above, can be used sufficiently at low voltage or high voltage, so the same transformer 4 is used, taking into account the relatively small electric capacity of the motor 3 and timer 7a.
By providing ET, high and low voltage switching becomes possible.

As a result, the portion corresponding to the terminals of the transformer 4 at low voltage is free, but sufficient electrical insulation is maintained for safety reasons.

However, in the above embodiment, switching is performed using a plug-in terminal, but the timer motor, sweater, etc., are made longer and tied at one place at the rear of the clothes dryer, and a one-touch switching method using a connector is adopted. Then, switching between high and low voltage can be done by simply removing the back cover 13, making it very easy to switch.

It should be noted that the motor 3 and timer motor 7 described above may be used for high-voltage specifications, just as a step-up transformer may be used.

In addition, as a simple configuration that does not use a transformer, it is possible to easily switch between high and low voltages by switching the motor windings in series or parallel, or by adding a resistor to the timer motor. be.

〔Effect of the invention〕

As described above, according to the present invention, Mu! 7! By using a heater that can be used under four voltages, we can standardize parts for each region with different voltages, and by using a low-capacity transformer that is essential for converting only motors and timer motors,
Since it is possible to provide a clothes dryer that can switch between high and low voltage, it is possible to create a general-purpose clothes dryer that can be used in all regions of the world at a low cost. This invention is very simple and can be said to have excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view of a clothes dryer according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the relationship between the voltage and heater input of a semiconductor heater having a positive characteristic resistance, and FIG. , 4 are control circuit diagrams when using a high voltage, and FIGS. 5 and 6 are control circuit diagrams when using a low voltage. 1 ・Door switch, 2 Heater, 3 ・Motor, 4 ・
Transformer, 5, 6, cam switch A, B, 7 timer,
7a...Timer motor, 8 Fan, 9.Intake port, 1
0 drum, lOa... drum support, 11 - exhaust port, 12 - connector, 13 3rd country G (

Claims (1)

[Claims] 1. A rotatable drum for drying clothes, a blower fan that blows air into the drum, a motor that drives the blower fan, and a heater that heats the air that enters the drum; In a clothes dryer consisting of a motor and a timer that controls the operation time of the heater, the heater is
A clothes dryer characterized by having a semiconductor heater that is commonly used up to a voltage range that is twice or half the rated voltage and that can generate a roughly constant amount of heat at a predetermined air volume. 2. In the item described in claim 1, when the working voltage of the motor and the timer motor matches the power supply voltage, the motor and the timer motor are connected to the power supply without going through a transformer, and the voltages do not match. Sometimes configured to connect to the power supply via a transformer,
A clothes dryer in which a semiconductor heater is connected without a transformer so that it can be used with both high and low power supply voltages.