JPH10211399A - Gas clothing dryer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a gas clothing dryer in which city gas or propane gas is burned in an airframe and hot air is supplied into a rotating drum to dry clothing, a gas concentration at the time of ignition is set to an optimum concentration. , So that poor ignition is unlikely to occur. SOLUTION: Hot air heated by a gas combustion unit 12 is supplied into a rotating drum 2 for storing and drying clothes by a blower fan, and the amount of gas supply to the gas combustion unit 12 is controlled by a proportional control valve 14. The control means 19 drives the motor 8 for driving the rotary drum 2 and the blower fan at a predetermined number of revolutions at the time of the ignition operation, and gradually increases the gas supply amount by the proportional control valve 14. If the number of revolutions is controlled to be gradually decreased, the ignition is performed by the igniter 24 during the control of the gas supply amount and the number of revolutions, and the ignition of the gas combustion unit 12 is detected by the flame detection means 25, Is stopped, and the gas supply amount and the rotation speed are controlled to predetermined values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas garment dryer for burning city gas or propane gas in a machine body and supplying hot air to a rotating drum to dry clothes.

[0002]

2. Description of the Related Art Conventionally, in a gas clothing dryer, a motor is driven during an ignition operation, a rotating drum and a blower fan are rotated, an igniter is operated, and a gas is supplied to a gas combustion section by a proportional control valve. The supply amount is controlled to be constant, and the gas combustion section is ignited.

[0003]

In such a conventional gas clothing dryer, since the proportional control valve is opened after the discharge is started by the igniter, the gas concentration is maintained until the gas is injected into the gas combustion section. 0%, but when the proportional control valve is opened,
Since the rotation speed of the motor has almost reached the steady rotation speed and the gas concentration instantaneously becomes constant, it is difficult to obtain the optimum ignition concentration at the time of ignition, so that poor ignition is likely to occur.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to optimize the gas concentration at the time of ignition so that poor ignition hardly occurs.

[0005]

According to the present invention, in order to achieve the above object, hot air heated by a gas combustion unit is supplied to a rotating drum for storing and drying clothes by a blower fan, and supplied to the gas combustion unit. The gas supply is controlled by a proportional control valve. At the time of the ignition operation, the control means first drives the motor for driving the rotating drum and the blower fan at a predetermined rotation speed and gradually increases the gas supply amount by the proportional control valve, and then gradually increases the rotation speed of the motor. Control so as to decrease, and ignite with an igniter during the control of the gas supply amount and the rotation speed,
When the ignition of the gas combustion part is detected by the flame detecting means, the operation of the igniter is stopped, and the gas supply amount and the rotation speed are controlled to predetermined values.

Thus, the gas concentration at the time of ignition can be changed in a wide range, the ignition can be performed at the optimum concentration, and the occurrence of ignition failure can be suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a rotating drum for storing and drying clothes, a blower fan for supplying hot air heated by a gas combustion unit into the rotating drum, and A proportional control valve for controlling the amount of gas supplied to the gas combustion section, an igniter for igniting the gas combustion section, flame detection means for detecting ignition of the gas combustion section, and driving the rotary drum and the blower fan And a control means for controlling the operation of the proportional control valve, the igniter, the motor, etc., wherein the control means first drives the motor at a predetermined rotation speed during the ignition operation to thereby control the proportional control valve. After the gas supply amount is gradually increased, the rotation speed of the motor is controlled to be gradually decreased, and the ignition is performed by the igniter during the control of the gas supply amount and the rotation speed. Gas by means When the ignition of the baking section is detected, the operation of the igniter is stopped, and the gas supply amount and the number of revolutions are controlled to predetermined values. Can be controlled, the gas concentration at the time of ignition can be changed in a wide range, ignition can be performed at an optimum concentration, and ignition failure can be suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means controls the proportional control valve if the ignition of the gas combustion portion is not detected by the flame detection means during the ignition operation. After gradually increasing the gas supply,
The control cycle of gradually decreasing the number of rotations of the motor is configured to be repeated until a predetermined time.By controlling the number of rotations of the motor, the amount of air blown by the blower fan is controlled, and the gas concentration varies over a wide range. By repeating this, it is possible to make it difficult for poor ignition to occur.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIG.
The rotary drum 2 is supported by a drum support plate 3 provided in the front opening, and the rear portion of the rotary drum 2 is rotatably supported by a fan case 5 via a shaft 4. A filter 6 and a filter cover 7 are mounted on the inner wall of the rotating drum 2 so that lint coming out of clothes is not released outside the machine. The motor 8 is connected to a blower fan 10 provided in the fan case 5 by a fan belt 9 and blows hot air into the rotating drum 2 to dry clothes.

Further, in order to stir the clothes in the rotating drum 2, the rotating drum 2 is rotated via a drum belt 11 connected to a motor 8. The gas combustion unit 12 is housed in a combustion chamber 13 provided in the outer frame 1 and heats hot air supplied to the rotary drum 2 by burning gas. The proportional control valve 14 controls the supply amount of gas burned in the gas combustion unit 12.

Next, as shown in FIG.
The rotary drum 2 is provided with a plurality of magnets 15 and the magnets 15 and a magnetic sensor 16 fixed to the main body of the dryer.
The rotation number detecting means 17 receives the pulse signal and detects the rotation number of the rotary drum 2 from the cycle of the pulse.

The number-of-rotations setting means 18 sets the number of rotations of the rotary drum 2 based on the output of the control means 19. The number-of-rotations comparing means 20 compares the number of rotations of the rotary drum 2 detected by the number-of-rotations detecting means 17 with the number of rotations set by the number-of-rotations setting means 18, and controls the conduction time based on the output of the number-of-rotations comparing means 20. The conduction angle of the bidirectional thyristor 22 connected in series to the motor 8 through the
The number of rotations is controlled.

As the simplest conduction time control method, phase control can be considered. In the case of an inverter, not only the conduction time but also the frequency can be controlled. By controlling the rotation speed of the motor 8, the rotation speed of the blower fan 10 connected to the motor 8 by the fan belt 9 can be controlled.

The operation display means 23 allows the user to input a driving course and the like, and displays the driving state by a lamp, a light emitting diode or the like. The igniter 24 ignites the gas combustion unit 12 with a spark generated when a high voltage is applied to an electrode (not shown). The flame detecting means 25 is composed of a thermocouple, a frame rod, or the like, detects ignition of the gas combustion unit 12, and inputs its output to the control means 19.

The control means 19 includes the motor 8, the proportional control valve 1
4. Control the operation of the igniter 24 and the like. At the time of the ignition operation, the motor 8 is first set to a predetermined rotation speed (steady rotation speed), and the gas supply amount is gradually increased by the proportional control valve 14. The number of revolutions of the motor 8 is controlled so as to gradually decrease, and the ignition is performed by the igniter 24 during the control of the gas supply amount and the number of revolutions. If the operation of the igniter 24 is stopped,
The gas supply amount and the rotation speed are controlled to predetermined values.

The operation of the above configuration will be described with reference to FIG. 3. The operation is started at time t0, and the rotation speed of the rotating drum 2 is shown in FIG. In this way, control is performed so as to achieve a steady rotation speed. At this time, the blower fan 10 also rotates at the same time. After a steady flow of air is generated in the combustion chamber 13 by the rotation of the blower fan 10, at time t1, as shown in FIG.
The igniter 24 is operated to enable ignition, and at time t2
Then, as shown in FIG. 3C, the proportional control valve 14 is gradually opened. By gradually opening the proportional control valve 14, the combustion gas is supplied to the gas combustion section 12, and the gas concentration in the combustion chamber 13 gradually increases as shown in FIG.

When the ignition of the gas combustion section 12 is not detected by the flame detecting means 25, the rotational speed of the motor 8 is controlled at time t3 after the gas supply amount reaches a predetermined value by the proportional control valve 14. By doing so, the rotation speed of the rotary drum 2 is controlled so as to gradually decrease as shown in FIG. At this time, the speed of the blower fan 10 also decreases at the same time, and the flow of air in the combustion chamber 13 also decreases. As a result, the gas concentration in the combustion chamber 13 further increases gradually as shown in FIG.

In this way, the optimum ignition gas concentration can be easily created, and the gas combustion unit 12 can be ignited at time t4. After ignition, the rotating drum 2
Becomes a steady speed, and the application of voltage to the igniter 24 is stopped by an ignition detector (not shown).

(Embodiment 2) Control means 19 in FIG.
If the ignition of the gas combustion section 12 is not detected by the flame detecting means 25 during the ignition operation, the proportional control valve 14 gradually increases the gas supply amount and then gradually decreases the rotation speed of the motor 8. The control cycle of the control is repeated until a predetermined time. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described with reference to FIG. 4. The operation is started at time t0, and the rotation speed of the rotating drum 2 is shown in FIG. In this way, control is performed so as to achieve a steady rotation speed. At this time, the blower fan 10 also rotates at the same time, and after a steady flow of air is generated in the combustion chamber 13, at time t1, the igniter 24 is operated as shown in FIG. 4B, and at time t2,
As shown in FIG. 4C, the proportional control valve 14 is gradually opened.
The gas concentration in the combustion chamber 13 gradually increases as shown in FIG.

Thereafter, at time t3, the rotation speed of the rotating drum 2 is controlled by controlling the rotation speed of the motor 8 as shown in FIG.
Control is performed so that the speed gradually decreases as shown in (a). At this time, the blower fan 10 also operates at a low speed, and the combustion chamber 1
The airflow at 3 is also reduced. As a result, the gas concentration in the combustion chamber 13 further increases gradually as shown in FIG. At time t5, unless ignition of the gas combustion unit 12 is detected by the flame detecting means 25, the proportional control valve 14 is closed, and the control cycle from time t0 to time t5 is repeated until a predetermined time t6.

In this way, the optimum ignition gas concentration can be easily generated a plurality of times, and the gas combustion unit 12 can be ignited at time t7. After the ignition, the rotation speed of the rotary drum 2 becomes the steady rotation speed, and the application of the voltage to the igniter 24 is stopped by the ignition detection device (not shown).

[0024]

As described above, according to the first aspect of the present invention, a rotating drum for storing and drying clothes,
A blower fan for supplying hot air heated by a gas combustion unit into the rotary drum, a proportional control valve for controlling a gas supply amount to the gas combustion unit, an igniter for igniting the gas combustion unit, Flame detection means for detecting ignition to the combustion unit, a motor for driving the rotating drum and a blower fan,
Control means for controlling the operation of the proportional control valve, the igniter, the motor, and the like, wherein the control means first drives the motor at a predetermined rotation speed during the ignition operation to supply gas by the proportional control valve. After gradually increasing the amount, control is performed such that the number of revolutions of the motor is gradually decreased, and the ignition is performed by the igniter during the control of the gas supply amount and the number of revolutions.
If the ignition of the gas combustion part is detected by the flame detecting means, the operation of the igniter is stopped and the gas supply amount and the rotation speed are controlled to predetermined values, so that the rotation speed of the motor is controlled. By doing so, it is possible to control the amount of air blown by the blower fan, gradually change the gas concentration when igniting the gas combustion section, easily create the optimum gas concentration for ignition, Problems can be solved.

According to the second aspect of the present invention, the control means gradually increases the gas supply amount by the proportional control valve unless the flame detection means detects the ignition of the gas combustion part during the ignition operation. After that, the control cycle of gradually decreasing the rotation speed of the motor is configured to be repeated until a predetermined time.By controlling the rotation speed of the motor, the amount of air blown by the blower fan is controlled, and the gas concentration is reduced. By repeating the change over a wide range, it is possible to easily create the optimum ignition gas concentration a plurality of times, and it is possible to eliminate problems such as poor ignition.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gas clothing dryer according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the gas clothing dryer.

FIG. 3 is an operation time chart of the gas clothing dryer.

FIG. 4 is an operation time chart of a gas clothing dryer according to a second embodiment of the present invention.

[Explanation of symbols]

 2 rotating drum 8 motor 10 blowing fan 12 gas combustion section 14 proportional control valve 19 control means 24 igniter 25 flame detection means

Claims (2)

[Claims] A rotating drum for storing and drying clothes;
A blower fan for supplying hot air heated by a gas combustion unit into the rotary drum, a proportional control valve for controlling a gas supply amount to the gas combustion unit, an igniter for igniting the gas combustion unit, Flame detection means for detecting ignition to the combustion unit, a motor for driving the rotating drum and a blower fan,
Control means for controlling the operation of the proportional control valve, the igniter, the motor, and the like, wherein the control means first drives the motor at a predetermined rotation speed during the ignition operation to supply gas by the proportional control valve. After gradually increasing the amount, control is performed such that the number of revolutions of the motor is gradually decreased, and the ignition is performed by the igniter during the control of the gas supply amount and the number of revolutions.
A gas clothes dryer configured to stop the operation of the igniter if the ignition of the gas combustion unit is detected by the flame detection means, and to control the gas supply amount and the rotation speed to predetermined values. 2. The control means, if the ignition of the gas combustion unit is not detected by the flame detection means during the ignition operation, gradually increase the gas supply amount by the proportional control valve and then reduce the rotation speed of the motor. 2. The gas clothing dryer according to claim 1, wherein a control cycle of gradually decreasing is repeated until a predetermined time.