JPH09135998A - Drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drying machine that dries clothes in, a drum driven by a motor and in warm air being introduced into the drum, and that attains an improved reliability by taking the following measures. The structure of a rotation detection means to detect a speed of rotation or a cycle of rotation and that of an open and close detection means to detect open or close of a door are simplified, the number of parts items of the machine and the costs are reduced, and the accuracy is improved. SOLUTION: A rotation detection means 6 detects a speed of rotation or a cycle of rotation of a rotating drum 1, and an open and close detection means 7 detects open or close of a door through which clothes are thrown into the drum. A control means 8 controls a speed of rotation of a motor 5 and a PTC heater 3. The control means is composed, of a display part 8a and a control part 8b. A rotation detection means 6 consists of the first magnet 6a and the first magnetic sensor 6b attached to the rotary drum 1. The open and close detection means 7 consists of the second magnet and the second magnetic sensor 7b attached to the door. The attaching points are so chosen to decrease mutual magnetic interference between the first magnetic sensor 6b and the second magnetic sensor 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer which circulates warm air in a rotary drum which is driven by a motor to dry clothes.

[0002]

2. Description of the Related Art In recent years, a clothes dryer for home use has been proposed which detects the rotation speed of a rotary drum for drying clothes and controls the rotation speed according to the type and amount of clothes.

Conventionally, a clothes dryer of this type has been disclosed in Japanese Patent Laid-Open No. 58-58.
It was constructed as shown in Japanese Patent Publication No. 163712. That is, a permanent magnet is attached to the rotating drum, and a reed switch is attached at a position facing the permanent magnet to form a rotation speed detecting mechanism, so that the number of rotations of the rotating drum is detected.

[0004]

In such a conventional clothes dryer, there is a problem that the number of parts of the rotation speed detecting mechanism increases, the cost increases, and the reliability decreases due to the increase in the number of parts. It was Further, if the opening / closing detection means for detecting the opening / closing of the door is composed of a permanent magnet and a magnetic sensor such as a reed switch, the permanent magnet mounted on the rotating drum affects the magnetic sensor of the opening / closing means of the door, and the opening / closing means malfunctions. Had a problem.

[0005] The present invention solves the above-mentioned conventional problems.
The structure of the rotation detection means for detecting the rotation speed or rotation cycle of the rotating drum and the opening / closing detection means for detecting the opening / closing of the door is simplified, the number of parts and the price are reduced, the detection accuracy is improved, and the reliability is improved. Is intended.

[0006]

In the clothes dryer of the present invention, the rotation detecting means for detecting the number of rotations or the rotation cycle of the rotating drum is composed of the first magnet and the first magnetic sensor mounted on the rotating drum. The opening / closing detection means for detecting the opening / closing of the door includes a second magnet and a second magnetic sensor mounted on the door, and positions the first magnetic sensor and the second magnetic sensor at a position where magnetic mutual interference is reduced. It is arranged.

As a result, the influence of the residual magnetism of the magnetic shield plate can be reduced, and the detection accuracy of each of the rotation detecting means and the open / close detecting means can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a rotating drum for drying clothes, an air blowing means for circulating hot air into the rotating drum, and an air blowing path into the rotating drum. Heating means provided, a door for putting clothes into the rotary drum, a motor for rotationally driving the blower means or the rotary drum, a rotation detecting means for detecting a rotation speed or a rotation cycle of the rotary drum, An opening / closing detection means for detecting opening / closing of the door, and a control means for controlling the number of rotations of the motor and the heating means are provided, the control means is divided into an operation display portion and a control portion, and the rotation detection means is The rotary drum includes a first magnet and a first magnetic sensor, and the opening / closing detection unit includes a second magnet and a second magnetic sensor attached to the door. 2 magnetic The sensor is arranged at a position where magnetic mutual interference is reduced, and by detecting magnetic mutual interference between the first magnetic sensor of the rotation detecting means and the second magnetic sensor of the opening / closing detecting means, the rotation of the rotary drum can be detected. The detection accuracy can be improved and the reliability can be improved without causing malfunction of the door open / closed detection.

According to a second aspect of the present invention, in the invention according to the first aspect, the first magnetic sensor is provided in the control unit, and the second magnetic sensor is provided in the operation display unit. Mutual interference is reduced, and rotation detection of the rotary drum and door opening / closing detection can be performed with the first magnetic sensor and the second magnetic sensor mounted on the control board of the control means.

According to a third aspect of the present invention, in the above-described first or second aspect of the invention, the second magnetic sensor is disposed on the operation display section, and the second magnetic sensor and the rotary drum are mounted. A magnetic shield plate is provided between the first magnet and the magnetic shield plate so that the magnetic field of the first magnet mounted on the rotary drum by the porcelain shield plate does not affect the second magnetic sensor of the opening / closing detecting means. The first magnet does not cause the second porcelain sensor to malfunction, and the detection accuracy can be improved.

[0011] The invention described in claim 4 is the above-mentioned claim 1-
In the invention described in 3, the control means is divided into an operation display section in which operation switches or indicators are mounted and a control section in which switching means such as a relay is mounted, and the component mounting surfaces are arranged so as to be opposite to each other. The first magnetic sensor of the rotation detecting means can be mounted toward the rotary drum side, and the second magnetic sensor of the door opening / closing detecting means can be mounted toward the door side. Magnetic sensor and second
It is possible to reduce the mutual magnetic interference of the magnetic sensor.

According to a fifth aspect of the present invention, there is provided a rotating drum for drying clothes, an air blowing means for circulating warm air into the rotating drum, a heating means provided in an air blowing path into the rotating drum, and A door for loading clothes into the rotary drum, a motor for rotationally driving the blower means or the rotary drum, a rotation detecting means for detecting the number of rotations or a rotation cycle of the rotary drum, and an opening / closing for detecting opening / closing of the door. A detection means; and a control means for controlling the rotation speed of the motor and the heating means, wherein the rotation detection means includes a first magnet and a first magnetic sensor mounted on the rotating drum,
The opening / closing detection means includes a second magnet and a second magnetic sensor attached to the door, a magnetic shield plate is provided between the second magnetic sensor and the first magnet, and the magnetic shield plate remains. The magnetic direction and the magnetic direction of the second magnet mounted on the door are arranged so as to weaken each other, and the magnetic pole of the residual magnetism generated on the magnetic shield plate by the first magnet mounted on the rotating drum. With the magnetic poles of the second magnet attached to the door set in the same direction, the residual magnetism of the magnetic shield plate can be weakened by the magnetic field of the second magnet.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) As shown in FIG. 1 and FIG. 2, a rotary drum 1 is for accommodating and drying an object to be dried (clothes), and a heat exchange type double-blade fan (blower means) 2 is used for the rotary drum 1. Circulate warm air inside. The heat exchange type double-blade fan 2
Hot air is circulated in the rotary drum 1 and at the same time air from the outside is taken in to cool the fan to dehumidify the circulating air in the rotary drum 1. The PTC heater (heating means) 3 is arranged in the air blowing path to the rotary drum 1, that is, in the circulating air intake, and heats the circulating air.

The door 4 puts clothes on the rotating drum 1 so that clothes and warm air inside the rotating drum 1 do not come out. The motor 5 rotationally drives the rotary drum 1 and the heat exchange type double-blade fan 2. By controlling the rotation speed of the motor 5, the rotation speeds of the rotary drum 1 and the heat exchange-type double-blade fan 2 can be controlled. The heat generation amount of No. 3 can be controlled, and the electric power can be controlled.

The rotation detecting means 6 detects the number of rotations of the rotating drum 1, and the rotating drum 1 has a first magnet 6a.
Is attached, and the first magnetic sensor 6b is arranged so as to face the first magnet 6a to detect the rotation speed of the rotary drum 1. The opening / closing detection means 7 attaches the second magnet 7a to the door 4, and arranges a second magnetic sensor 7b facing the second magnet 7a to detect opening / closing of the door 4.

The control means 8 controls the rotation of the motor 5 and the PTC heater 3 by the signal of the rotation detecting means 6 and the signal of the open / close detecting means 7, and the rotating drum 1 according to the open / close state of the door 4 or the amount of the dried clothes. Control the rotation speed of. Control means 8
Is a microcomputer or the like, and includes an operation display section 8a including operation switches and an indicator lamp, a control section 8b for controlling the rotation of the motor 5 and the PTC heater 3, a bidirectional thyristor 80 and relays 81a, 81b. It is configured by the power switching unit 8c.

The bidirectional thyristor 80 controls the rotation speed of the motor 5 to control the amount of air blown, and controls the current of the PTC heater 3. Usually, the power switching unit 8c is mounted on the same control board as the control unit 8b.

The first magnetic sensor 6b and the second magnetic sensor 7b are usually reed switches, and the second magnetic sensor 7b is provided on the control board of the operation display section 8a of the control means 8 attached to the main body. The first magnetic sensor 6b is mounted on the control board of the controller 8b to reduce magnetic mutual interference.

That is, as shown in FIGS. 3 and 4,
The control means 8 is divided into an operation display portion 8a having an operation switch 9 and an indicator light 10 mounted thereon and a control portion 8b having switching means such as relays 81a and 81b mounted thereon, and the first magnet 6a mounted on the rotary drum 1. The first magnetic sensor 6b is mounted on the control unit 8b so as to face the second magnetic sensor 7b, and the second magnetic sensor 7b is mounted on the operation display unit 8a so as to face the second magnet 7a mounted on the door 4. The mounting surfaces are arranged so as to be opposite to each other. The magnetic shield plate 11 is made of an iron plate having a small residual magnetism, and the magnetic shield plate 11 is arranged between the first magnet 6a and the second magnetic sensor 7b. It does not reach the sensor 7b.

The operation of the above-mentioned structure will be described. The rotation detecting means 6 uses the first magnetic sensor 6b for the first magnet 6
The proximity of a is detected, the rotation of the rotary drum 1 is detected, and the opening / closing detector 7 detects the proximity of the second magnet 7a by the second magnetic sensor 7b to detect the opening / closing of the door 4. The control means 8 controls the rotation of the motor 5 and the PTC heater 3 by the signal of the rotation detection means 6 and the signal of the open / close detection means 7, and the rotation speed of the rotary drum 1 according to the open / closed state of the door 4 or the amount of dried clothes. To control.

At this time, since the first magnetic sensor 6b and the second magnetic sensor 7b are arranged at positions where magnetic mutual interference is reduced, malfunctions of rotation detection of the rotary drum 1 and opening / closing detection of the door 4 are prevented. Therefore, the detection accuracy can be improved, and the reliability can be improved. Further, with the first magnetic sensor 6b and the second magnetic sensor 7b mounted on the control board of the control means 8, the rotation detection of the rotary drum 1 and the opening / closing detection of the door 4 can be performed.

The magnetic shield plate 1 is provided between the second magnetic sensor 7b and the first magnet 6a mounted on the rotary drum 1.
1 is provided and the magnetic shield plate 11 is made of an iron plate, the magnetic permeability is high and the magnetic lines of force are apparently absorbed. Therefore, when the first magnet 6a comes close to the second magnetic sensor 7b, it is possible to prevent the door 4 from being erroneously detected as closed even though the door 4 is open due to the magnetic field thereof.
It is possible to prevent erroneous detection that the door 4 is open even though the door 4 is closed, and it is possible to prevent magnetic mutual interference.

Further, by disposing the operation display section 8a and the control section 8b so that the component mounting surfaces are opposite to each other, the first magnetic sensor 6b of the rotation detecting means 6 is directed toward the rotary drum 1 side. The second magnetic sensor 7b of the opening / closing detecting means 7 of the door 4 can be mounted toward the door 4 side, and magnetic mutual interference between the first magnetic sensor 6b and the second magnetic sensor 7b can be reduced. be able to.

In the above description, the magnetic shield plate 11
Is provided between the first magnet 6a and the second magnetic sensor 7b.
It can be omitted by separating b.

(Embodiment 2) FIG. 5 is a sectional view seen from the upper part of the dryer main body, showing the magnetic pole arrangement relationship between the second magnet 7a of the opening / closing detection means 7 of the door 4 and the magnetic shield plate 12. Shows. As shown in the figure, a magnetic shield plate 12 is provided between the second magnetic sensor 7b and the first magnet 6a, and the residual magnetic direction of the magnetic shield plate 12 and the second magnetic sensor installed on the door 4
The magnets 7a are arranged so as to weaken each other. The other structure is the same as that of the first embodiment.

The operation of the above structure will be described. The remanent magnetism of the magnetic shield plate 12 is generated by the magnetic field of the first magnet 6a mounted on the rotary drum 1, and the first magnet 6a.
Even if there are a plurality of magnetic poles, by appropriately aligning the magnetic pole directions, the remanent magnetism direction can be aligned with the magnetic field direction generated by the second magnet 7a, as shown in the figure.

When the magnetic field direction of the residual magnetism of the magnetic shield plate 12 generated by the first magnet 6a and the magnetic field direction of the second magnet 7a cancel each other, the second magnet 7a approaches the magnetic shield plate 12. And the residual magnetism of the magnetic shield plate 12 and the magnetic field of the second magnet 7a repel each other, apparently increasing the magnetic force lines passing through the second magnetic sensor 7b, and increasing the open / close detection distance of the open / close detection means 7. You can

In the above description, the magnetic sensor is composed of the reed switch, but the other magnetic sensors can be similarly implemented.

[0029]

As described above, according to the first aspect of the present invention, the rotation detecting means comprises the first magnet and the first magnetic sensor mounted on the rotating drum, and the opening / closing detecting means is , A second magnet mounted on the door and a second magnetic sensor, and the first magnetic sensor and the second magnetic sensor are arranged at a position where magnetic mutual interference is reduced. By reducing the magnetic mutual interference between the magnetic sensor and the second magnetic sensor of the opening / closing detection means, it is possible to improve the detection accuracy without causing malfunction of the rotation detection of the rotary drum and the opening / closing detection of the door, and to improve reliability. Can be improved.

According to the second aspect of the invention, the first magnetic sensor is arranged in the control section, and the second magnetic sensor is arranged in the operation display section so as to reduce magnetic mutual interference. Therefore, in the state where the first magnetic sensor and the second magnetic sensor are mounted on the control board of the control means, the rotation of the rotary drum and the opening / closing of the door can be detected, and the two magnetic sensors can be separated from each other. Further, it is possible to reduce the mutual magnetic interference of each of the detection means using magnets, reduce the number of parts of each detection means, reduce the price, and improve the reliability.

According to the third aspect of the present invention, the second magnetic sensor is arranged in the operation display section, and the second magnetic sensor is provided between the second magnetic sensor and the first magnet mounted on the rotary drum. Since the magnetic shield plate is provided, the magnetic field of the first magnet attached to the rotary drum by the porcelain shield plate causes the second magnetic field of the open / close detection means to be the second
The second magnetic sensor does not malfunction due to the first magnet, and the detection accuracy can be improved.

Further, according to the invention described in claim 4, the control means is divided into an operation display portion on which an operation switch or an indicator light is mounted and a control portion on which switching means such as a relay is mounted, and the component mounting surface is divided. The first magnetic sensor of the rotation detecting means is mounted toward the rotating drum side, and the second magnetic sensor of the door opening / closing detecting means is mounted toward the door side. Can first
It is possible to reduce the mutual magnetic interference between the magnetic sensor and the second magnetic sensor, and it is possible to bring the respective magnetic sensors close to the magnets facing each other, so that it is possible to reduce the residual magnetic flux density of the magnets and to reduce the size. And price reduction.

Further, according to the invention of claim 5, a magnetic shield plate is provided between the second magnetic sensor and the first magnet, and the residual magnetic direction of the magnetic shield plate and the second magnet mounted on the door. Since the magnetic fields of the second magnet are arranged so as to weaken each other, the magnetic field of the second magnet is prevented from concentrating on the magnetic shield plate, so that the magnetic field to the second magnetic sensor apparently increases and opens and closes. The detection sensitivity of the detection means increases, and the second
The magnet can be downsized, and the detection accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a clothes dryer according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the clothes dryer.

FIG. 3 is an enlarged cross-sectional view showing a configuration of rotation detection means and opening / closing detection means of the clothes dryer.

FIG. 4 is a front view of control means of the clothes dryer.

FIG. 5 is a second clothes dryer according to a second embodiment of the present invention.
Top view with partially cutaway showing the magnetic polarity of the magnet and the magnetic shield plate

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating drum 2 heat exchange type double-blade fan (blowing means) 3 PTC heater (heating means) 4 door 5 motor 6 rotation detecting means 6a first magnet 6b first magnetic sensor 7 open / close detecting means 7a second magnet 7b second 2 magnetic sensor 8 control means 8a operation display section 8b control section

Claims (5)

[Claims] 1. A rotating drum for drying clothes, an air blowing means for circulating warm air into the rotating drum, a heating means provided in an air blowing path into the rotating drum, and throwing clothes into the rotating drum. A door, a motor for rotationally driving the blower means or the rotating drum, a rotation detecting means for detecting a rotation speed or a rotation cycle of the rotating drum, an opening / closing detecting means for detecting opening / closing of the door, and Control means for controlling the number of revolutions and the heating means are provided, the control means is divided into an operation display section and a control section, and the rotation detection means is provided with a first magnet and a first magnet mounted on the rotating drum. The opening / closing detection means includes a second magnet attached to the door and a second magnetic sensor.
The clothes dryer in which the magnetic sensor and the second magnetic sensor are arranged at a position where magnetic mutual interference is reduced. 2. The clothes dryer according to claim 1, wherein the first magnetic sensor is arranged in the control unit, and the second magnetic sensor is arranged in the operation display unit to reduce magnetic mutual interference. 3. A first magnetic sensor, wherein a second magnetic sensor is provided on an operation display section, and the second magnetic sensor and the rotary drum are mounted on the first magnetic sensor.
The clothes dryer according to claim 1, further comprising a magnetic shield plate provided between the clothes dryer and the magnet. 4. The control means is divided into an operation display section in which operation switches or indicators are mounted and a control section in which switching means such as a relay is mounted, and the component mounting surfaces are arranged so as to be opposite to each other. The clothes dryer according to claim 1. 5. A rotating drum for drying clothes, an air blowing unit for circulating warm air into the rotating drum, a heating unit provided in an air blowing path into the rotating drum, and throwing clothes into the rotating drum. A door, a motor for rotationally driving the blower means or the rotating drum, a rotation detecting means for detecting a rotation speed or a rotation cycle of the rotating drum, an opening / closing detecting means for detecting opening / closing of the door, and Control means for controlling the number of revolutions and the heating means, the rotation detecting means is composed of a first magnet and a first magnetic sensor mounted on the rotating drum, and the opening / closing detecting means is mounted on the door. Consisting of a second magnet and a second magnetic sensor,
A magnetic shield plate is provided between the second magnetic sensor and the first magnet, and the residual magnetism direction of the magnetic shield plate and the magnetic direction of the second magnet mounted on the door are arranged so as to weaken each other. Clothes dryer.