JPH02159300A - Clothing drying machine - Google Patents

Abstract

PURPOSE:To enable a drying degree to be selected widely ranging from low drying to high drying by setting a sensor for detecting the drying degree of an object to be dried, near a hot air inflow course into a drum, and near a hot air outflow course, and by controlling a motor and a heater. CONSTITUTION:When dehydrated clothing 22 is contained in a drum 7 and a power source is made, then a motor 18 and a heater 13 are electrified, and the drum 7 is rotated at a low speed, and a both-sided-fan 16 is rotated at a high speed. On the leeward of the heater 13, a humidity sensor containing device 25a set in a sensor box 26 in the front and rear of the drum 7 on the windward of the object 22 to be dried is used for the low drying detecting of low drying proper to ironing. On the leeward of the object 22 to be dried, the humidity sensor containing device 25a set in a fan casing 11 on the windward of the both-sided-fan 16 is used for the high drying detecting of the high drying of a dried state without moisture. Aa a result, a drying degree in a wide range can be detected at high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clothes dryer, and relates to a method for installing a sensor that automatically detects the finished state of drying with high accuracy.

[Conventional technology]

Conventionally, as a method to automatically detect the finish condition of a clothes dryer, hot air is introduced from the front of the drum that stores the items to be dried and is applied to the items to be dried, and a humidity sensor and temperature sensor that detects changes in the condition of the moist air at the rear of the drum are used. The method used was to install sensors to detect humidity and temperature changes in humid air. Also, besides this.

There is an electrode sensor detection method in which hot air is introduced from the front of the drum and applied to the material to be dried, and the amount of moisture contained in the cloth is detected by a change in resistance by directly contacting the front surface of the drum.

However, with all of the conventional humidity sensor, temperature sensor, and electrode sensor methods, sensors are only placed on one side of the material to be dried, with the hot air inlet side (the front of the drum) and the hot air outlet side (the rear side of the drum). This is a method of detection. Therefore, with an electrode sensor installed on the hot air inlet side (front of the drum), as shown in Figure 11, it is possible to detect humidity because the change in resistance over time is noticeable when the humidity is dry. At extremely dry conditions, the temporal resistance change becomes extremely large and difficult to detect.

Conversely, if a humidity sensor or temperature sensor is installed on the hot air outlet side (behind the drum), as shown in Figure 10, in dry conditions with no moisture, there is a change in resistance over time, which can be detected. However, when the temperature is humid and dry, the temporal resistance change is extremely large and difficult to detect.

Therefore, none of the detection methods to date have been able to detect a state ranging from a dry state with some moisture remaining to a dry state without any moisture, and the selection range of the degree of dryness has been narrow.

[Problem to be solved by the invention]

Even if a humidity sensor, temperature sensor, or electrode sensor is used as in the conventional technology, the sensor is installed only on one side of the hot air inlet side (the front side of the drum) or the hot air outlet # (the rear side of the drum) for detection. With this method, it is possible to accurately detect only one of two methods: either end the drying at a low dryness that leaves some moisture, such as when ironing, or stop the drying at a high dryness with no moisture left. Therefore, it is not possible to select a wide range of dryness,
It's not easy to use.

An object of the present invention is to provide a clothes dryer that allows a wide range of dryness levels to be selected from low dryness suitable for ironing to high dryness that does not require ironing.

[Means to solve the problem]

The above purpose is to install a sensor on the front side of the drum, which is downstream of the heater and upwind of the material to be dried, and another sensor is installed on the rear side of the drum, which is between the leeward of the material to be dried and the windward side of the heat exchanger. This is achieved by

[Effect]

This sensor is installed at the front of the drum, which is upwind of the material to be dried and downwind of the heater.The sensor resistance changes noticeably when the dryness is low, which is suitable for ironing, so it is used to detect low dryness.
It is also a sensor installed upwind of the heat exchanger on the leeward side of the object to be dried, and is used to detect high dryness because the sensor resistance changes markedly when there is no moisture or high dryness. Therefore, instead of using a single sensor in the past, we now use two sensors and only take advantage of the advantages of the installation location, so there is no difference in operation from the previous one, and it is highly reliable.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 3, 4, and 10. A back cover 2 is fixed to the rear surface of a metal machine frame 1. A door 4 for opening and closing the clothing entrance/exit 3 formed on the front side of the machine frame 1 is located at the front part of the machine frame 1, and a ring-shaped drum support plate 5 made of gold 1 is fixed to the machine frame 1 and the machine frame. A drum 7 serving as a drying chamber is rotatably supported by a rear bearing 6 disposed at the rear of the drum 1. The drum 7 has a hot air outlet 8 formed of a large number of holes on its rear surface. A circulation path 10 is formed which communicates a hot air inlet 9 formed on the lower side of the drum support plate 5 with a vent 12 of the fan casing 11. A honeycomb-shaped heater 13 made of a positive temperature coefficient thermistor is provided opposite the hot air inlet 9, and is housed in an L-shaped duct 14 fixed to the drum support plate 5. A heat exchange type double-sided fan 16 disposed astride inside the fan casing 11 is rotatably supported on a support shaft 17 via a metal.

A motor 18 disposed in the upper part of the machine frame 1 rotates the drum 7 using pulleys including an idler pulley and a belt, and the double-sided fan 16 is also rotated by the pulleys and belt. A filter 19 is attached from the inside so as to also cover the hot air outlet 8 on the rear surface of the drum 7. A cooling air inlet 20 is formed in the center of the back cover 2, and a cooling air outlet 21 is formed in the outer circumference.

In addition, a large number of ventilation holes 27 are formed in the upper part of the annular drum support plate 5 to allow ventilation with the inside of the drum 7, and a humidity sensor 23a for detecting humidity and aerodynamic humidity is connected to a humidity sensor case 24a
and connect the humidity sensor Bukumi 25a to the ventilation hole 2.
It is installed in a sensor box 26 facing 7. In the fan casing 11 facing the hot air outlet 8, a humidity sensor 23a for detecting changes in the state of humid air in the drum is installed as a humidity sensor book 25a by combining it with a humidity sensor case 24a.

The operation will be explained below. During operation, the dehydrated clothes 22 are stored in the drum 7 through the door 4, and when the power (not shown) is turned on, the electric motor 18 and the heater 13 are energized, causing the drum 7 to rotate at a low speed and the double-sided fan 16 to rotate at a high speed. . The air from the circulation path 10 is heated by the heater 13 in the L-shaped duct 14 and enters the drum 7 through the hot air inlet 9 of the drum support plate 5 as high-temperature dry air, touches the clothes 22, and removes the moisture contained in the clothes 22. After evaporating and turning into high-temperature and high-humidity air, cloth waste is removed by the filter 19, the double-sided fan 1 in the fan casing 11 is passed through the hot air outlet 8 of the drum 7.
It is sucked into 6. Here, the air outside the machine is cooled to a temperature below the dew point, and condensed water is generated on the circulation air path side of the double-sided fan 16, and the condensed water is discharged from the drain port 15 of the circulation path 10.

During this drying process, the humidity and temperature of the humid air inside the drum 7 forms a gradient between the front part of the drum 7 and the rear part of the drum 7 on the hot air inlet side, as shown in FIG. If you installed the sensor Bukumi 23c,
As shown in Figure 10, the humidity changes from low dryness suitable for ironing to high dryness suitable for warehousing do not persist and appear.

A single sensor cannot accurately detect the degree of dryness. Therefore, in this embodiment, sensor boxes 2 are installed before and after the drum 7, which is downstream of the heater 13 and upwind of the material to be dried 22.
The humidity sensor Bukumi 25a installed in the drying area 25a is used to detect low dryness because the humidity changes significantly when the dryness is low, which is suitable for ironing. The humidity sensor book 25a installed in the casing 11 is used to detect high dryness because the humidity changes noticeably from dry to high dry. As a result, it may be possible to accurately detect the degree of dryness over a wide range.

Although the above embodiment describes the case where the humidity sensor 23a is used, the temperature sensor 23c shown in FIG. 7 may be molded as shown in FIG. Temperatures around 7.7% change with an upward slope that is opposite to humidity changes. As shown in FIG. 10, the temperature change at the temperature sensor booklet 25c attached to the humidity sensor booklet 25a at the same place before and after the drum 7 changes relative to the humidity sensor booklet 25a, so the drum 7
Temperature sensor Bukumi 2 with fan casing 11 that detects low dryness with temperature sensor Bukumi 25c attached to the front side
The same effect can be obtained by detecting high dryness at 5c.

Further, as shown in FIG. 2, electrodes 23b and I! are located at the front and lower portions of the drum 7 as shown in FIGS. 5 and 6. When the electrode sensor bookumi 25b consisting of the pole base 24b is installed, the cloth contact resistance between the electrodes 23b changes as shown in FIG. You can get the same effect as using two humidity sensors.

The same effect can be obtained by combining any two of the humidity sensor 23a and the temperature sensor 23C and the two-electrode sensor 23b.

〔Effect of the invention〕

According to the present invention, a wide range of drying can be automatically stopped from low dryness suitable for ironing to complete dryness without leaving any moisture without ironing, so a wide range of drying courses can be selected.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a clothes dryer according to an embodiment of the present invention, Fig. 2 is a side sectional view of an embodiment of the present invention, and Figs. 3 and 4 are diagrams showing the condition of the humidity sensor. , Fig. 5 and Fig. 6 are diagrams showing the state of the electrode sensor, Figs. 7 and 8 are diagrams showing the state of the temperature sensor, Fig. 9 is a diagram showing the relationship between humidity and temperature before and after the drum, and Fig. A diagram showing the relationship between dryness in the drying process, humidity and temperature of sensors attached before and after the drum, and FIG. 11 is a diagram showing the relationship between cloth resistance and dryness of electrode sensors attached before and after the drum. 5... Drum support board, 7... Drum, 11... Fan casing, 13... Heater, 16... Double-sided fan, 22... Material to be dried, 23a... Humidity sensor, 23b ...Electrode, 23c...Temperature sensor 24
a... Humidity sensor case, 24b... Electrode base, 24c... Temperature sensor, 25a... Humidity sensor book, 25b... Electrode sensor book, 25c.
・・Temperature sensor probe record Hayabusa record j't l Bq darkness

Claims (1)

[Scope of Claims] 1. A drum rotatably supported within a machine frame, a heater serving as a heat source for sending hot air into the drum, a blower device that circulates air through the heater and the drum, and this blower device. and an electric motor for driving the drum, each of which is equipped with a sensor that directly or indirectly detects the degree of drying of the material to be dried, near the hot air inflow path and the hot air outflow path into the drum, A clothes dryer that controls an electric motor and a heater. 2. In claim 1, the vicinity of the hot air inlet means:
A clothes dryer characterized in that the ventilation path between the heat source and the object to be dried and the vicinity of the hot air outflow path are defined as the ventilation path between the object to be dried and the heat exchanger. 3. In claim 2, the ventilation path between the heat source and the material to be dried refers to the space on the side opposite to the drum of the drum support plate that rotatably supports the drum, and the ventilation path between the material to be dried and the heat exchanger. , a clothes dryer characterized by having a heat exchanger inlet section. 4. Claim 3 is characterized in that the sensor in the space on the side opposite to the drum of the drum support plate is used to detect low dryness, and the sensor at the inlet of the heat exchanger is used to detect high dryness. clothes dryer. 5. The clothes dryer according to claim 4, wherein the sensor mainly detects humidity.