JPH0759977A - Drum type washing and drying machine - Google Patents

Abstract

PURPOSE:To prevent a user from being scalded even if he touches a heater for washing when its temperature adjusting means fails. CONSTITUTION:At the time of washing, temperature rise by a heater for washing 2 heating washing water in a drum 1 is detected by the temperature detection means 7 of a dryer's heater 6 which heats air ventilating within a rotary drum 12 at the time of drying, and when the detected temperature is raised in excess of a specified value, current-carrying to the heater for washing 2 is turned off with a safety means 9 actuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washer / dryer having a fail-safe function.

[0002]

2. Description of the Related Art A drum type washer / dryer is provided with a rotating drum, which is rotated at a low speed for washing, and when the washing is completed, the drum is rotated at a high speed for dehydration.
Then, a single device is used to perform a series of steps from washing to drying by supplying warm air.

Next, the structure of a conventional drum type washer / dryer will be described with reference to FIG.

In FIG. 4, 31 is the main body of the washer / dryer.
Reference numeral 32 denotes a receiving cylinder provided in the main body 31 and has a function of storing water during washing. Reference numeral 33 denotes a rotary drum existing in the receiving cylinder 32, which is connected to a drive motor 35 via a drive belt 34 and receives rotation of the drive motor 35 to rotate. Numeral 36 is a door of an inlet for putting cotton or the like for washing into the rotary drum 33, 37 is a water supply valve for supplying water into the receiving cylinder 32, 38 is a drain valve for removing water in the receiving cylinder 32, and 39 is washing. Sometimes receiving pipe 32
A washing heater for heating the water inside, 40 is a fan that operates during drying, 41 is a drying heater that warms the air from the fan 40, 42 is a heat exchanger, 43 is an operation display unit, and 44 is
A process control unit that drives loads such as the drive motor 35 and the fan 40 to control each process from washing to drying.

In the drum type washer / dryer having the above construction, when the washing process is started, first, the water supply valve 37 is opened to supply water from the upper part of the rotating drum 33 into the receiving cylinder 32, and when the water level becomes constant, the washing heater is used. Energization to 39 is started, the water in the receiving tube 32 is warmed to a predetermined water temperature, and the drive motor 35
Rotates to rotate the rotating drum 33 at a low speed for washing, and when the washing is completed, the drain valve 38 opens, drains the water in the receiving cylinder 32, and then rotates the rotating drum 33 at a high speed for dehydration. Was there. After that, the water supply valve 37 is slightly opened to allow the cooling water to flow through the heat exchanger 42, the heater 41 for drying and the fan 40 are energized, and the generated hot air is circulated in the rotary drum 33 and the heat exchanger 42 for drying. I was on the road.

[0006]

In the conventional drum type washer / dryer having the above-described structure, a large vibration is generated when the rotary drum 33 is started in the dehydration process, and the temperature of the washing heater 39 is adjusted. Temperature detection device (process control unit 4)
However, there was a fear that this vibration might cause a failure such as a wire breakage. A technique for reducing vibration during dehydration in a drum type washer / dryer has been proposed (see Japanese Patent Application Laid-Open No. 4-82591).

However, if the washing process is started in a state in which the temperature detecting device fails due to a wire breakage or the like and does not operate effectively, the washing water supplied to the receiving cylinder 32 is heated by the washing heater 39. If it is energized for
The water for washing inside is heated to an abnormally high temperature without being controlled, and the rotating drum 33 and the door 36 that come into contact with the heated water also become high in temperature, and if the user touches them by mistake, they will get burned. There was a point.

According to the present invention, even if the temperature control device of the washing heater fails due to vibration at the time of start-up, the washing water is not abnormally heated by the washing heater and there is no fear of burns. The purpose is to provide a washer / dryer.

[0009]

In order to achieve the above object, in a drum type washer / dryer of the present invention, a receiving cylinder containing a rotary drum and heating water for washing in the receiving cylinder are heated at the time of washing. Washing heater, a temperature adjusting means for detecting or controlling the heater temperature when heating the washing heater to adjust the temperature of the washing water, and a drying heater for heating the air circulated in the rotary drum at the time of drying. And a temperature detecting means for detecting the temperature of the drying heater, and a safety means for operating at a predetermined value of the temperature detected by the temperature detecting means or more at the time of washing to cut off the power supply to the washing heater. It is a thing.

In order to achieve the above object, a receiving cylinder having a built-in rotary drum, pressure detecting means for detecting the amount of washing water supplied to the receiving cylinder, and inside the receiving cylinder during washing A washing heater for heating the washing water, a temperature adjusting means for adjusting the temperature of the washing heater, and a washing heater which is operated at a predetermined value or more detected by the pressure detecting means to energize the washing heater. And a safety means for shutting off.

[0011]

According to the drum type washer / dryer constructed as described above, if the temperature of the washing water continues to rise and the temperature of the washing water rises, the temperature of the drying heater also rises. The temperature detecting means for the drying heater, which is provided separately from the temperature adjusting means for detecting the temperature of the heating heater or controlling the temperature, controls the temperature of the drying heater portion to be equal to or higher than a predetermined value. When it is detected, the safety means is operated so as to determine that it is abnormal and cut off the power supply to the washing heater.

Further, when the temperature of the washing water rises, the vapor pressure in the receiving cylinder rises, so the pressure detecting means for detecting the amount of water supplied for washing detects a pressure above a predetermined value. When this happens, it is judged to be abnormal and the safety means is operated to stop energizing the washing heater.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of a drum type washer / dryer of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing an embodiment of the technical means of the invention described in claim 1. In FIG.

In FIG. 1, 1 is a receiving cylinder containing a rotary drum, 2 is a washing heater for heating the washing water in the receiving cylinder 1 at the time of washing, and 3 is a temperature for detecting the temperature of the washing water. The detection means A and 4 control the energization of the washing heater 2 according to the temperature detected by the temperature detection means A3, and the temperature control means A and 5 for adjusting the temperature of the washing water rotate the inside of the receiving cylinder 1 during drying. A fan for circulating air into the drum, 6 is a drying heater for heating the air by the fan 5, 7 is temperature detecting means B for detecting the temperature of warm air heated by the drying heater 6, and 8 is this temperature. The temperature control means B and 9 for controlling the energization of the drying heater 6 by using the temperature detected by the detection means B7 to adjust the temperature of the warm air are temperature detection means B7 during washing.
When the detected temperature of 10 is equal to or higher than a predetermined value, the safety means 10 determines that a failure has occurred in the temperature detection means A3, and 10 is the safety means 9.
Is a pump for discharging water in the receiving cylinder 1, and 12 is a rotary drum built in the receiving cylinder 1. The temperature control means A4, the temperature control means B7, and the safety means 9 can be housed in the process control section 44 in FIG.

The temperature detecting means A3 for detecting the temperature of the washing heater 2 and the temperature controlling means A4 for controlling the temperature of the washing heater 2 are respectively operated by independent means.
Further, the action of both means also serves to adjust the temperature of the washing heater 2. Therefore, even if the temperature detecting means A3 and the temperature controlling means A4 are independent means,
In addition, the generic term for both means is referred to as a temperature control means.

Also in the case of this drum type washer / dryer, the same series of washing-dehydrating-drying process operations as described in the section of the above-mentioned prior art are performed. When the temperature detecting means A3 of the washing heater 2 is operating in a normal state,
As shown by the dotted line of the time-sensed temperature characteristic in (a), the temperature is accurately sensed and the temperature control means A4 operates accurately, so that the sensed temperature is saturated until the washing water is saturated. The temperature does not rise abnormally.

However, when the temperature detecting means A3 is out of order, accurate temperature detection cannot be performed, and the temperature control means A
4 does not operate accurately and is continuously energized to the washing heater 2, so that the temperature detected by the temperature detecting means B7 is as shown in FIG.
As indicated by the solid line in (a), it continues to rise above normal. The safety means 9 operates when the temperature detected by the temperature detection means B7 exceeds a predetermined judgment level to stop the energization of the washing heater 2, and the notification means 10 operates to notify the user. Report an abnormality. This allows the user to know the risk of burns.

Even when the temperature control means A4 is out of order, the same operation as described above is performed, so that when the temperature control means of the washing heater fails, burns can be prevented and safety is ensured.

Next, FIG. 2 is a block diagram showing an embodiment of the technical means of the invention described in claim 2. In FIG. 2, 12 is a rotary drum built in the receiving cylinder 1, and 13 is a receiving drum. The pressure detecting means is connected to the receiving cylinder 1 by the air trap 14 in order to detect the amount of washing water supplied into the cylinder 1.

During normal washing, the pressure inside the receiving cylinder 1 is only the vapor pressure of a predetermined amount of water.
As indicated by the dotted line of the time-detected pressure characteristic in (b), the pressure detected by the pressure detection means 13 is saturated without increasing so much. However, when the temperature detection means A3 is out of order, the temperature control means A4 does not operate accurately and the washing heater 2 is continuously energized, and as a result, the washing water comes to a boil, and the receiving cylinder Since the degree of airtightness of 1 is quite good, the pressure detected by the pressure detecting means 13 rises more than normal as shown by the solid line in FIG. 3 (b). Further, when the air bubbles generated by the boiling enter the air trap 14, the detected pressure rises more rapidly. And safety means 9
Operates when a predetermined judgment level is exceeded to stop energizing the washing heater 2 and informs the user of abnormality by the notifying means 10.

[0022]

As described above, according to the drum type washer / dryer of the present invention, the following effects can be obtained.

The temperature detected by the temperature detecting means for controlling the temperature of the circulating air during drying rises above a predetermined value, or the amount of washing water supplied into the receiving cylinder is detected. If the pressure detected by the pressure detecting means rises above a predetermined value, it is determined that the temperature adjusting means of the washing heater has failed, and thus the water temperature of the washing water is abnormal even if the temperature adjusting means fails. It will never rise to. Therefore, the rotating drum and the door do not become hot, and the user does not get burned when touched.
Since it has a simple structure, it can be performed without increasing the cost.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a drum type washer / dryer according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a drum type washer / dryer according to another embodiment of the present invention.

FIG. 3 is an operation characteristic diagram in the example.

FIG. 4 is a perspective view showing the configuration of a conventional drum type washer / dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receptacle 2 Washing heater 3 Temperature detecting means A 4 Temperature control means A 6 Drying heater 7 Temperature detecting means B 9 Safety means 12 Rotating drum 13 Pressure detecting means

Front page continuation (72) Inventor Kimihiko Otsuka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A receiving cylinder containing a rotary drum, a washing heater for heating water in the receiving cylinder, a temperature adjusting means for adjusting the temperature of the washing heater, and a wind circulating in the rotating drum. A drum type heater that heats the washing heater, a temperature detecting means that detects the temperature of the drying heater, and a safety means that shuts off the power to the washing heater when the temperature detected by the temperature detecting means exceeds a predetermined value. Washing and drying machine. 2. A receiving cylinder containing a rotary drum, pressure detecting means for detecting the amount of water supplied in the receiving cylinder, a washing heater for heating the water in the receiving cylinder, and the temperature of the heater. A drum-type washer / dryer comprising temperature control means and safety means for shutting off power to the washing heater when the pressure detected by the pressure detection means exceeds a predetermined value.