JPH02268799A - Drying machine for clothing - Google Patents

Abstract

PURPOSE:To offer the title machine excellent for producibility and maintainability without necessity for exchanging parts, such as a drum-driving pulley and a fan-driving pulley, composing the drying machine, by a method wherein, even if each of zones has a different frequency, such as 50Hz or 60Hz, about a power source, a pitch diameter of the drum-driving pulley is selected for 55Hz of a medium value between them, and the numbers of connection with a power source circuit for a heating element consisting of a plurality of thermistors with a positive temperature coefficient are selected. CONSTITUTION:A pitch diameter of a pulley 7 for driving a drum 3 is selected for 55Hz of a medium value between 50Hz and 60Hz, and the numbers of connection with a power source circuit for a heating element 5-1 consisting of a plurality of thermistors with a positive temperature coefficient are made selective. Since both the drum 3 and a fan 11 rotating in proportion to the speed of a motor 4 produce the difference of rotation of 20% between 50Hz and 60Hz, this influence can be canceled by the above ways. Furthermore, when it is used at 50Hz zone, a frequency selector switch 5-3 is closed; and when 60Hz zone, the frequency selector switch 5-3 is opened and the numbers of connection with the power source circuit for the heating element 5-1 are selected. In this way, the difference of the above described frequency consequently, the power consumption for heating device 5 based on the difference of air capacity is kept constant either at 50Hz or 60Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clothes dryer, and more specifically, even if the power frequency varies depending on the region, such as 50Hz or 60Hz, the dryer main body components, such as the drum The present invention relates to a clothes dryer that does not require conversion of drive pulleys, fan drive pulleys, etc., and has excellent productivity and repair serviceability.

[Conventional technology]

Conventionally, clothes dryers have 50 different power supply frequencies.
It was necessary to adopt a main body configuration corresponding to each of the Hz and 60 Hz regions.

For example, in order to keep the rotational speed of the drum constant in accordance with the power frequency, it was necessary to replace the drum drive pulley. Additionally, if a positive temperature coefficient thermistor is used in the heating element for generating hot air, which is currently the mainstream in Japan, it is necessary to keep the air volume of the blower constant in order to prevent power consumption from changing due to differences in power supply frequency. To achieve this, it was necessary to replace the fan drive pulley in order to keep the fan rotation speed constant. In particular, keeping the latter power consumption constant is unavoidable in terms of standards and specifications.

[Problem to be solved by the invention]

Conventionally, when assembling a clothes dryer, some of the dryer components mentioned above had to be used depending on the power frequency, and once the product was delivered to the customer, the power supply If you move to an area with a different frequency or receive a gift, some of the dryer components mentioned above must be replaced, and the fan drive belt is made of polyurethane rubber or other self-tensioning type. However, in the case of such a device, this replacement is also necessary, and the repair service work is inconvenient or disadvantageous.

The purpose of the present invention is to prevent some of the dryer components, such as the drum drive pulley and fan drive pulley, from differing in power frequency when the power supply frequency varies depending on the region, such as 50Hz or 60Hz, and a positive temperature coefficient thermistor is used as a heating element. There is no need to use different power sources depending on the frequency of the power source, and it also prevents power consumption from changing due to differences in power frequency.This not only improves productivity, but also reduces the need for repair services when a customer moves to an area with a different power frequency. An object of the present invention is to provide an improved clothes dryer that can extremely easily perform the following operations.

[Means to solve the problem]

The purpose is to provide a clothes dryer in which clothes are stored in a rotating drum, hot air is supplied to the drum to dry the clothes, and a positive temperature coefficient thermistor is used as a heating element for generating the warm air. The pitch diameter of the rotatably driven drum drive pulley is set to match the power frequency of 55 Hz, which is between 50 Hz and 60 Hz, and the number of heating elements connected to the power circuit, which is composed of a plurality of positive temperature coefficient thermistors, is adjusted. This is achieved by providing a means for switching.

[Effect]

That is, currently, the power frequency of household power supply is 50
There are two types, Hz and 60Hz, and the power frequency is 60H.
In the case of z, the basic rotation speed of the motor is 20% higher than that of 50 Hz. Therefore, both the drum and the fan, which rotate in proportion to the motor, have a rotational speed difference of 20%. In a clothes dryer, the rotational speed of the drum affects the state of agitation of the clothes.

This problem can be solved by setting the pitch diameter of the drum driving pulley that rotationally drives the drum to a pinch diameter that matches the power frequency of 55 Hz, which is between 50 Hz and 60 Hz.

However, if a positive temperature coefficient thermistor is used as the heating element,
The difference in air volume caused by the difference in fan rotation speed directly affects the power consumption of the heating element. In other words, when the amount of air passing through one heating element is large, that is, when the fan rotation speed is high, the temperature of the heating element is low and its resistance value is small, resulting in a large amount of power consumption. 6. Conversely, when the amount of air passing through the heating element is small, the temperature of the heating element is high and its resistance value is large.
This has an effect on the standards, specifications, and even the temperature rise of each part of the dryer itself.

Under these circumstances, the present invention eliminates the need for product configurations for each power frequency by providing means for switching the number of heating elements connected to the power supply circuit, each consisting of a plurality of positive temperature coefficient thermistors. For example, the fan drive pulley and fan drive belt can be used in common at 50Hz and 60Hz.

That is, when the rotational speed of the fan 11 is different from 50 Hz to 60 Hz, by switching the number of heat generating elements connected to the power supply circuit, the heat generating device can be adjusted based on the difference in frequency and, by extension, the difference in fan air volume. In order to keep the power consumption constant at both 50Hz and 60Hz.

At 50Hz, close the frequency selector switch, and at 60Hz
At this time, open the frequency selector switch.

〔Example〕

The present invention will be explained below based on the drawings.

FIG. 1 is an electric circuit diagram showing an embodiment of a clothes dryer according to the present invention, and FIG. 2 is a partial vertical sectional view showing the internal structure of the clothes dryer.

In FIG. 2 showing the overall structure of the clothes dryer, the outer frame 1
Clothes are stored inside the drum and is rotated by a motor 4 attached to the outer frame 1 via a drum drive pulley 7 and a drum drive belt 8. Lifter for stirring clothes 3-1
A drum 3 is installed. A door 2 is used to take clothes in and out of the drum 3, and is attached to the outer frame 1 so as to be openable and closable. On the opposite side of the drum 3 from the door 2, there is a lint filter 13 that collects lint generated from clothing.
is detachably attached to the drum 13. Furthermore, a fan 11 and a fan casing 12 are installed on the rear side, and a heat generating device 5 (as shown in FIG. 1, a plurality of positive temperature coefficient thermistors 5-1) is installed in front of the fan 11 and the drum 3. Consisted of. (hereinafter referred to as a heating element for convenience), hot air is supplied into the drum 3. Here, the fan 11 is connected to a fan drive pulley 9. which is attached to the motor 4. The rotational motion of the motor 4 is transmitted via the fan drive belt 10 by a fan driven pulley 11 - 1 that is integrated with the fan 11 . Reference numeral 6 denotes a control device which is controlled by a timer 6-1 and a heater strong/weak switch 6-2 shown in FIG. The motor 4 is a synchronous capacitor motor commonly used in home appliances, etc., and can obtain a constant rotation speed depending on the power supply frequency.
The fan 11 is also rotated at a rotation speed proportional to the rotation speed of the motor 4.

In the first part showing the electric circuit diagram of the dryer of the present invention, the motor 4° heating device 5 is connected in parallel to the power source 15, and the opening and closing of the electric circuit is controlled by the timer 6-1. 14 is a power source 15 connected to the opening and closing of the door 2.
This is a door switch that opens and closes the door. 4-1 is a motor capacitor, 6-2 is a heater changeover switch that allows the user to switch the capacity of the heat generating device 5 to strong or weak during operation, and 5-2 is a switch in case something abnormal occurs in the heating element 5-1 of the heat generating device 5. , which is a current fuse that cuts off electricity to the heating element 5-1. 5
-3 is a frequency changeover switch for preventing fluctuations in power consumption due to differences in the rotational speed of the fan 11 due to differences in power supply frequency, that is, differences in the amount of air passing through the heating element 5-1.

The present invention is as described above.Next, the operation of the clothes dryer shown in the above-mentioned embodiment will be explained.As mentioned above, there are currently two power supply frequencies of household power supply, 50Hz and 60Hz. There are different types, and when the power supply frequency is 60 Hz, the basic rotation speed of the motor 4 is 20% higher than when it is 50 Hz. Therefore, the drum 3 rotates in proportion to the motor 4.
．． For both fans 11, a difference in rotation speed of 20% occurs. In the clothes dryer, the rotation speed of the drum 3 affects the agitation state of the clothes, but this problem is solved by changing the pitch diameter of the drum drive pulley 7 that rotates the drum 3 to a power frequency of 50Hz.
This can be solved by setting the pitch diameter to 55 Hz, which is between 55 Hz and 60 Hz.

However, if a positive temperature coefficient thermistor is used as the heating element,
The difference in air volume caused by the difference in the rotational speed of the fan 11 directly affects the power consumption of the heating element (i.e., when a positive temperature coefficient thermistor is used as the heating element, its resistance value changes depending on the temperature of the heating element.

Power consumption changes. In other words, when the amount of air passing through one heating element is large, that is, when the rotation speed of the fan 11 is high, the temperature of the heating element is low and its resistance value is small, and the amount of power consumption increases.

The amount of heat generated also increases. Conversely, if the amount of air passing through the heating element is small, the temperature of the heating element is high and its resistance value is large, resulting in low power consumption and low heat generation. This will also affect the temperature rise in each part of the dryer itself. Strictly speaking, the difference in air volume itself has a slight effect on drying clothes, but as long as there is a margin in the air volume, there is no problem in practical use.

Under these circumstances, the present invention includes a means for switching the number of heating elements 5-1 each formed of a plurality of positive temperature coefficient thermistors connected to the power supply circuit. 2. Therefore, there is no need to adopt a product configuration for each power frequency, for example, fan drive pulley 9. Fan drive/</L'1-10 at 50Hz
,60Hzl? You can share it with others. That is, when the rotational speed of the fan 11 is different from 50 Hz to 60 Hz, the number of heating elements 5-1 connected to the power supply circuit is changed accordingly, thereby adjusting the frequency difference and, by extension, the air volume of the fan 11. To keep the power consumption of the heat generating device 5 constant based on the difference at both 50 Hz and 60 Hz, the frequency selector switch 5 is set at 50 Hz.
-3 is closed, and at 60Hz, frequency selection switch 5-
Open circuit 3. Incidentally, the capacity of the heating element 5-1 whose connection to the power circuit a is switched by the frequency changeover switch 5-3 is 50 Hz.

It goes without saying that it is provided with a combination of two individual capacities that can absorb the difference in power consumption due to the difference in air volume of 60 Hz.

Further, in the above embodiment, the case where the connection of the heating element 5-1 to the power supply circuit is changed by the frequency changeover switch 5-3 was illustrated, but this is different from the example in which the connection of the heating element 5-1 to the power supply circuit is changed using the frequency changeover switch 5-3. The output wire 5-4 may be left out from the body 5-1, and may be connected for 50 Hz and left open for 60 Hz.

Furthermore, the frequency selection switch 5 in the embodiment of FIG.
-3, that is, a frequency selection switch 5-3 to the power supply circuit of the heating element 5-1 composed of a plurality of positive temperature coefficient thermistors.
and the frequency switching Hiji line 5-4 in the embodiment of FIG.
That is, the frequency switching sunrise wire 5-4 to the power supply circuit of the heating element 5-1 is located in a place that the user does not normally touch, for example, inside the outer frame shown by reference numeral 1 in FIG. It is preferable to provide this for safety reasons.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the explanation of the illustrated embodiments, according to the present invention, the power supply frequency is 50H.
z, 60Hz, depending on the region, and if a positive temperature coefficient thermistor is used as the heating element, it is necessary to use some of the dryer components, such as the drum drive pulley and fan drive pulley, depending on the difference in power frequency. Moreover, it prevents power consumption from changing due to the difference in power supply frequency, which not only improves productivity but also greatly simplifies repair service work even when a customer moves to an area with a different power supply frequency. An improved clothes dryer can be obtained that can perform

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the clothes dryer according to the present invention, FIG. 2 is a partial longitudinal cross-sectional view showing the internal structure of the clothes dryer, and FIG. 3 is an electric circuit diagram showing an embodiment of the clothes dryer according to the present invention. FIG. 2 is an electrical circuit diagram showing an example. 3...Drum, 4, Motor, 5...Heating bag! i2.
5-1... Heating element (positive temperature coefficient thermistor), 5-3...
- Frequency changeover switch, 5-4... Frequency changeover Hide line, 7... Drum drive pulley, 9... Fan drive pulley, 10... Fan drive belt, 11... Fan.

Claims (1)

[Scope of Claims] 1. In a clothes dryer that stores clothes in a rotating drum, supplies warm air to the drum to dry the clothes, and uses a positive temperature coefficient thermistor as a heating element that generates the warm air. , the pitch diameter of the drum driving pulley that rotationally drives the drum is set to 5, which is between the power frequency of 50 Hz and 60 Hz.
A clothes dryer having a pitch diameter adjusted to 5 Hz, and further comprising means for switching the number of heating elements connected to a power supply circuit, each of which is composed of a plurality of positive temperature coefficient thermistors. 2. In the invention as set forth in claim 1, a connection changeover switch is provided inside the dryer outer frame as a means for switching the number of heating elements each composed of a plurality of positive temperature coefficient thermistors to be connected to the power supply circuit. Installed clothes dryer. 3. In the invention set forth in claim 1, as a means for switching the number of connections of a heating element constituted by a plurality of positive temperature coefficient thermistors to a power supply circuit, a lead wire of a positive temperature coefficient thermistor whose connection can be freely switched is provided. A clothes dryer that is installed inside the dryer outer frame.