JPH06218194A - Drying machine - Google Patents

Abstract

PURPOSE:To provide a drying machine capable of preventing a room temperature from being abnormally increased even when drying time is shortened by making a heat source generate a heating value, and further to provide an economical drying machine for which the quantity of water to be used is small. CONSTITUTION:In the drying machine provided with a drying chamber 2 for drying objects to be dried, air blowing fan 8 for blowing air to the drying chamber 2, heat source 3 for heating air for drying to be sent to the drying chamber 2 and heat-exchange part for cooling and dehumidifying the high- temperature and high-humidity air exhausted from the drying chamber 2, the heat-exchange part is composed of an air cooling heat exchange part 23 utilizing air and a water cooling heat exchange part 25 utilizing water. Further, this machine is provided with a means for cooling and dehumidifying the air for drying only by the air cooling heat exchange part 23 when the heating value of the heat source 3 is switched to be small by a heat source heating quantity switching means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer having a heat exchange section for cooling and dehumidifying hot and humid drying air discharged from a drying chamber.

[0002]

2. Description of the Related Art A drying chamber for drying an object to be dried, a blowing fan for sending air to the drying chamber, a heat source for heating drying air sent to the drying chamber, and a discharge chamber for discharging the drying air. In a so-called dehumidifying dryer, which has a heat exchange section for cooling and dehumidifying high-temperature and high-humidity dry air, generally,
An air-cooled heat exchanger that is cooled by air is used (for example, Japanese Patent Publication No. 2-1280), or a water-cooled heat exchanger that is cooled by water is used.

[0003]

When the drying air discharged from the drying chamber is cooled and dehumidified by using an air-cooled heat exchanger or a water-cooled heat exchanger as in the conventional case,
In the former, air is used, so it is economical,
The heat exchanged heat is released to the room where the dryer is installed as it is.Therefore, if the heat quantity of the heat source is increased in order to shorten the drying time, the emitted heat quantity increases and the room temperature becomes abnormally high. Also, in the latter case, the heat exchanged heat quantity is not released indoors, so even if the heat quantity of the heat source is increased, the room temperature will not rise abnormally, but the amount of water used will increase and the economy will increase. Is disadvantageous.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and even if the drying time is shortened by increasing the heat quantity of the heat source, the room temperature does not rise abnormally, and the amount of water used is small, which is economical. To provide a general dryer.

[0005]

The object is to provide a heat exchange section for cooling and dehumidifying high temperature and high humidity drying air discharged from a drying chamber of a dryer, with an air cooling type heat exchange section for cooling using air. , A water-cooled heat exchange part that cools using water,
Further, when the heat generation amount of the heat source is switched to a small amount by the heat source calorific value switching means, it is achieved by providing a means for cooling and dehumidifying the drying air only by the air cooling heat exchange part.

[0006]

According to the present invention having the above-mentioned structure, since the heat exchange section of the dryer is composed of the air-cooled heat exchange section and the water-cooled heat exchange section, the heat quantity of the heat source is reduced in order to shorten the drying time. Even if the temperature is raised, the water-cooled heat exchange section exchanges heat for that portion, whereby an abnormal rise in room temperature can be prevented.

Moreover, when the air-cooled heat exchange section and the water-cooled heat exchange section are used together, and when the heat generation amount of the heat source is reduced, the cooling and dehumidification of the drying air is performed only by the air-cooling heat exchange section. The amount can be significantly reduced.

At this time, when the temperature of the drying air exceeds a predetermined value, the drying air is cooled and dehumidified by both the air-cooled heat exchange section and the water-cooled heat exchange section to increase the ambient temperature. Even in such a case, the problem that the temperature of the drying air becomes too high due to insufficient cooling does not occur.

[0009]

The following is a description of the case where the present invention is applied to the illustrated clothes dryer.

In FIG. 1 showing the overall structure of a clothes dryer, 1 is an outer frame, 2 is a shaft supported rotatably in the outer frame 1, and a rotary drum 3 for forming a clothes drying chamber is shown for drying 3. Is a drum drive belt for transmitting the rotational force of the electric motor 5 to the rotary drum 2.

At the rear of the rotary drum 2, a drum air outlet 6 for discharging the drying air shown by the solid arrow in FIG.
Is provided behind the drum air outlet 6, and an inlet 7 is provided so as to oppose the drum air outlet 6, and cooling air for cooling the drying air and the drying air flow (see FIG. 1).
A fan casing 9 is provided, which has a role of a blower to generate a heat-exchanger and also serves as a heat exchange part for cooling the drying air.

The fan casing 9 has a partition plate 10 and a double-blade fan 8 provided all around the inner circumference of the fan casing 9.
It is divided into a drying air side and a cooling air side by means of a felt 11 provided on the outer circumference.

Reference numeral 12 denotes a fan casing 9 and a rotary drum 2.
It is an airtight felt to keep it airtight.

The drying air outlet of the fan casing 9 is communicated with the heat source device 3 by a duct 13 and a duct 14 having a drainage port 21 in the middle thereof.

Reference numeral 16 is a belt for the double-blade fan 8, 17 is a pulley for the double-blade fan 8, 18 is a drum support member, and 19 is an opening / closing opening provided in front of the outer frame 1 for putting in / out an article to be dried (clothes). A door for doing, 22 is a filter, 20
Is a drum front fixed wall for rotatably supporting the rotary drum 2 on its outer periphery.

The double-blade fan 8 is located on the inner peripheral side (upwind side of the drying air) and, as shown in FIG. 2, is composed of blades having a corrugated cross section and is dried through the blade wall surface. An air-cooled heat exchanger portion 23 for exchanging heat between the working air and the cooling air, and a blade positioned on the outer peripheral side (downward side of the drying air) and having a cross-sectional shape as shown in FIG. And has a water-cooling type heat exchanger unit 25 for exchanging heat between the drying air and the cooling water by spraying the cooling water with the nozzle 24 and diffusing the cooling water on the surface thereof.

Reference numeral 26 is a water supply valve for controlling the water supply and stoppage of the water supply, 27 is a water supply pipe connecting the water supply valve 26 and the nozzle 24, and 28 is for communicating the water supply valve 26 with the tap of the water supply. The hose.

Reference numeral 55 represents cooling water ejected from the nozzle 24.

Here, the operation control of the clothes dryer having the above construction will be described.

FIG. 4 shows the control circuit.

In FIG. 4, 29 is 100V or 20
A power plug connected to a commercial power source of 0V, 30 is a power switch, 31 is a power supply circuit for supplying a DC voltage to a microcomputer 32 and a control electronic circuit having a built-in operation control program for a clothes dryer, and 33 is a commercial power supply. A transformer for stepping down the voltage of 100V or 200V of the power source to a voltage for electronic circuits, 34 is a reset circuit for resetting the microcomputer 32 when the power is turned on, and 35 is a system clock necessary for the microcomputer 32. A clock circuit, 36 is a switch input section for transmitting a switch input selected by the user to the microcomputer 32, such as a dry course setting, a heat source strength (heat generation amount) setting, and an operation start in the microcomputer 32, 37 Is the operating condition of the clothes dryer, drying course, heat source 3 Lamp display unit for notifying a user in strength (calorific value) such as a point lights or blinks the lamp,
38 is a microcomputer 3 for the operation of the input switch
2 accepts or when the operation is completed, the buzzer sounds to inform the user by sounding a buzzer, 39 detects changes in humidity and temperature of the drying air, and detects the dryness of clothes. It is a dryness detection means for doing so.

Reference numeral 40 denotes a dryness detection circuit for transmitting the information of the dryness detection means 39 to the microcomputer 32, 4
1 is a door switch that is turned on and off when the door 19 is opened and closed, 42 is a door switch input capturing circuit for transmitting the on / off state of the door switch to the microcomputer 32, 43 is an on switch of the power switch 30,
A power switch input capturing circuit for transmitting the OFF state to the microcomputer 32, 44 automatically supplies power when the operation is completed, or when the power switch is left in the ON state for a certain period of time without operation. Solenoid 4 for disconnecting power switch
5, a power switch disconnection circuit for energizing 5, a frequency signal acquisition circuit 46 for acquiring the frequency of the power supply used for time counting in the microcomputer 32, and a reference numeral 47 for driving the electric motor 5 with a signal from the microcomputer 32. An electric motor drive circuit, 48 is a heat source drive circuit for driving the heat source 3 by a signal from the microcomputer 32, and 49 is a water supply valve drive circuit for opening and closing the water supply valve 26.

Reference numeral 50 is a drying air temperature detecting means, which is arranged near the drum air outlet of the rotary drum 2.

Reference numeral 51 is a temperature detecting circuit for transmitting the information of the temperature detecting means to the microcomputer 32.

FIG. 5 shows the switch input section 36 and the lamp display section 37 of the clothes dryer. In FIG. 5, 52 is a start / pause switch for starting the operation or temporarily stopping the operation during the operation. , 53 are heater changeover switches for changing the strength (heat generation amount) of the heat source 3,
Reference numeral 54 is a dry course changeover switch for changing over the dry course.

The strength (heat generation amount) of the heat source 3 is switched by configuring the heat source 3 with two sets of A and B, and when strengthening the heat source 3, both A and B are driven and the heat source 3 is weakened. When doing, either A or B is driven.

Now, the overall operation of the clothes dryer will be described.

When the power plug 29 is inserted into the outlet, a DC voltage is generated by the power circuit 31 and the system clock is transmitted to the microcomputer 32 by the clock generation circuit 35.

At the same time, the reset circuit 34 resets the microcomputer 32 and puts it into an operating state so that the clothes dryer is in a state of waiting for a user's operation. When the user turns on the power switch 30, this information is transmitted to the microcomputer via the power switch input fetch circuit 43, and the initial display set in advance is displayed on the lamp display section 37 and the switch of the switch input section 36 is switched. It is ready to accept input.

Next, when the user opens the door 19 and puts clothes to be dried into the rotary drum 2 and closes the door 19, the door switch 41 is turned on and the door closing information is displayed. Door switch input capture circuit 42
Is input to the microcomputer 32 via the, and the operation start waiting state is entered.

Then, the user operates the dry course changeover switch 54 of the switch input section 36 to select one of a plurality of dry course provided in advance, and the heater changeover switch 53 controls the strength of the heat source 3. When selected and the start / pause switch 52 is operated, the clothes dryer starts the drying operation.

When the drying operation is started, electric power is supplied to the heat source 3 and the electric motor 5 according to an instruction from the microcomputer 32, and the rotary drum 2 and the double-blade fan 8 are rotated, whereby the drying air heated by the heat source 3 is supplied. Is discharged from the rotary drum 2 and sucked by the double-blade fan 8.

When the drying air passes through the double-blade fan 8, it is cooled by the heat exchange action of the double-blade fan 8, and the moisture taken from the material to be dried is condensed to form water droplets from the drain port 21. It is discharged outside.

The drying air that has passed through the double-blade fan 8 reaches the heat source 3 again through the ducts 13 and 14, and is heated there and flows into the rotary drum 2. This is continuously repeated to carry out the drying. .

The dryness of the clothes is detected by the dryness detecting means 39, and this is transmitted to the microcomputer 32 through the dryness detecting circuit 40.

When the clothes are dried, the microcomputer 32
Then, the microcomputer 32 issues a command to the heat source drive circuit 48 according to a predetermined program to stop the energization of the heat source 3 and perform a blowing operation for cooling the clothes.

When the blowing operation is performed for a predetermined time, a command is issued to the electric motor drive circuit 47 to end the operation.

If a predetermined time has passed after the end of the operation,
The power switch disconnection circuit 44 is instructed to automatically disconnect the power switch 30.

In the above drying operation, when the heat generation amount of the heat source 3 can be switched to the smaller one by the heater changeover switch 53, that is, when the heat exchange amount is small, the water supply valve 26 is closed to dry. The operation is controlled so that the working air is cooled and dehumidified only by the air-cooled heat exchange unit 23.

The ambient temperature is high and the temperature detecting means 5
When the temperature of the drying air detected at 0 becomes equal to or higher than a predetermined value, the water supply valve 26 is opened and water is sent to the nozzle 24,
Heat exchange by water cooling is also performed.

As described above, even if the amount of heat of the heat source 3 is increased to shorten the drying time, the increased amount of heat is exchanged by the water-cooling type heat exchange section 25, so that the temperature inside the room becomes abnormally high. Can be prevented.

Moreover, when the air-cooling type heat exchanging section 23 is used in combination and the heat source 3 is switched to the one with a smaller heat generation amount, the drying air is cooled and dehumidified only by the air-cooling type heat exchanging section 23, so that water is removed. The amount used can be minimized, and economical dry operation can be performed.

When the temperature of the drying air exceeds a predetermined value, the water-cooled heat exchanging section 25 is also cooled and dehumidified, so that even if the ambient temperature is high, the temperature of the drying air is insufficient due to insufficient cooling. There is no problem that the value becomes too high.

[0044]

As described above, according to the present invention, the drying time can be shortened by increasing the heat quantity of the heat source without causing an abnormal rise in the room temperature, and the amount of water used is small, which enables economical operation. Machine can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a dryer according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

3 is a sectional view taken along line YY of FIG. 1.

FIG. 4 is a control block circuit diagram of the dryer shown in FIG. 1.

FIG. 5 is a plan view of a switch input section and a lamp display section of the dryer shown in FIG.

[Explanation of symbols]

1 ... Outer frame, 2 ... Rotating drum, 3 ... Heat source, 5 ... Electric motor, 8
… Both-wing fan, 23… Air-cooled heat exchange part, 24… Nozzle
25 ... Water-cooled heat exchange section, 26 ... Water supply valve, 53 ... Heater selector switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Ishikawa 3-7-1, Ichibancho, Aoba-ku, Sendai City, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor Akio Sato, Ichibancho, Aoba-ku, Sendai City 3-7-1 Tohoku Electric Power Co., Inc. (72) Inventor Itaka Harada 3-7-1 Ichibancho, Aoba-ku, Sendai City, Miyagi Prefecture Tohoku Electric Power Co., Inc.

Claims (2)

[Claims] 1. A drying chamber for drying an object to be dried, a blower fan for sending air to the drying chamber, a heat source for heating drying air sent to the drying chamber, and discharge from the drying chamber. In a dryer having a heat exchange part for cooling and dehumidifying the high temperature and high humidity drying air, the heat exchange part is an air cooling type heat exchange part for cooling using air, and a water cooling for cooling using water. And a heat exchanger for changing the heat source to a smaller amount by means of the heat source heat quantity switching means, the dryer is provided with means for cooling and dehumidifying the drying air only with the air-cooling heat exchange section. 2. A temperature detecting means for detecting the temperature of the drying air is provided, and when the temperature of the drying air is equal to or higher than a predetermined value, the drying air is supplied to both the water cooling heat exchange section and the air cooling heat exchange section. The dryer according to claim 1, further comprising means for cooling and dehumidifying.