JP2011011079A - Clothing dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clothing dryer capable of shortening a time required of air drying operation by cool air without inputting a heater, thereby reducing shrinkage and damage of clothing.SOLUTION: The clothing dryer includes a drum to rotate and house objects to be dried, a blower to send drying air circulated in the drum and exhausted from an exhaust side of the drum, and an air circulation passage to circulate drying air delivered from the blower to a suction side of the drum. In the dryer, the number of revolution of a motor to rotationally driving the fan is set to 1,400 rpm or more, and the air drying operation is performed by cool air.

Description

  The present invention relates to a condensation-type clothes dryer that uses a heat exchange fan to dehumidify circulating drying air.

  Condensation-type clothing dryers are damaged by the type of clothing because they are dried with heated high-temperature drying air.

  Moreover, in the conventional clothes dryer, the motor rotation speed is set to a maximum of 1300 rotations. The motor speed is limited by the power supply frequency (f) and the number of poles (P). The formula for calculating the rotation speed (RPM) is “120 × f ÷ P”, and the number of poles is “4”. Therefore, in the case of 50 Hz, 120 × 50 (Hz) ÷ 4 = 1500 rotations, in the case of 60 Hz 120 × 60 (Hz) ÷ 4 = 1800 rotations is the maximum number of rotations. The full wave operation at each power supply frequency is as shown in FIG. 7, and in order to be able to deal with both 50 Hz and 60 Hz regions, 50 Hz with a lower maximum rotation speed is preferentially considered, and the motor rotation speed is Set. At this time, since the maximum is 1500 rotations at 50 Hz, it is possible to set the number of rotations higher than 1300 rotations. However, the rotation speed is set to 1300 rotations for the following reason.

  As shown in FIG. 8, the torque is most required when the rated capacity (5.0 kg) is applied, the weight of the compress is about 8.8 kg, and the required torque is 7 kg-cm. The maximum rotation speed is limited to 1300 rotations at 50 Hz and 1570 rotations at 60 Hz. Thereafter, the weight of the object to be dried gradually decreases by drying, and therefore the rotational speed tends to increase. At this time, by controlling the rotational speed to 1300, the rotational speed is suppressed, and the input is greatly decreased. .

  On the other hand, for example, when the maximum number of revolutions is controlled at 1400 rpm, as described above, when the compress is a compress (about 8.8 kg), as shown in FIG. As the speed advances, as shown in FIG. 9, the number of revolutions increases to the maximum of 1400 revolutions, so the input does not decrease much compared to the decrease in the weight of the material to be dried. That is, the overall efficiency is low from the beginning to the end of drying.

  Further, as the motor rotation speed is increased, temperature rise becomes a problem, and miniaturization of the motor becomes difficult to cope with it.

  Therefore, it is desirable to suppress the motor rotation speed as much as possible in order to “up the drying efficiency” and “miniaturization of the motor”, and 1300 rotations are set as the maximum rotation speed.

  In view of the above problems, an object of the present invention is to provide a clothes dryer that can dry without damaging heat-sensitive clothes.

  In addition, when drying is performed only by wind without using a heater, it is clear that the time required for drying is longer than that by warm air drying, and it is desired to shorten the time as much as possible from the viewpoint of usability.

  Further, as the required time increases, the mechanical force applied to the garment increases, so that the shrinkage of the garment increases even if only the wind is dried, and the damage increases. (Tendency unique to drum type) In view of the above, the next object of the present invention is to reduce the time required for drying and to reduce the shrinkage of clothes.

  The present invention provides a heat exchange fan that performs heat exchange between cooling air and drying air and also serves as a fan of drying air and cooling air, an electric motor that rotationally drives the heat exchange fan and the drum, and a drum It has a heater that heats the inflowing drying air, and a lid opening / closing means that allows the part of the circulating air path upstream of the heater to be connected to the outside of the fuselage, and closes the outside air supply with the opening / closing means open. The present invention is characterized in that a wind drying operation using cold air that does not energize the heater while simultaneously exhausting air / drying air is provided.

  Further, according to the present invention, in the above-described wind drying operation, the number of revolutions of the electric motor is increased as compared with the heating and drying operation in which the heater is energized, or in the wind drying operation, compared with the heating and drying operation in which the heater is energized. The number of rotations of the heat exchange fan is increased.

  According to the present invention, it is possible to suppress shrinkage and damage of clothing by wind drying operation with cold air, and only in the case of wind drying, by increasing the rotation speed of the motor and increasing the air volume, the drying time can be reduced. Shortening can be achieved.

1 is a longitudinal sectional view of a clothes dryer according to one embodiment of the present invention. The block circuit diagram of a control part in connection with one Example of this invention. The figure which concerns on one Example of this invention and shows a driving | operation operation part. FIG. 4 is an enlarged view of a part of FIG. 3. The flowchart of a wind drying course is related to one Example of this invention. The figure which concerns on one Example of this invention, and shows the flowchart of a standard (warm air) drying course. The figure which concerns on a prior art example, and shows the relationship between the motor rotation speed and torque in the power supply frequency 50Hz and 60Hz. The figure which concerns on a prior art example, and showed about the maximum motor rotation speed in the power supply frequency 50Hz and 60Hz when rating 5.0kg poultice is put. The figure which concerns on a prior art example, and showed the transition of the rotation speed in 50 Hz at the time of drying a 5.0 kg poultice at the time of setting a motor maximum rotation speed to 1400 rotation. The figure which concerns on one Example of this invention, and shows the relationship between the air volume at the time of drying, and drying time. The figure which concerns on one Example of this invention, and shows the relationship between a motor rotation speed and an air volume. The figure which concerns on one Example of this invention, and showed the maximum motor rotation speed in the power supply frequency 50Hz and 60Hz at the time of drying 1.0kg poultice in a wind drying course.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings.

  FIG. 1 is an overall configuration diagram of a clothes dryer. The rotatable drum 2 constituting the drying chamber is rotatably disposed in the outer frame 1 of the machine body, and a heater 3 for obtaining hot air for drying is disposed on the front surface of the drum 2. The drum 2 rotates by transmitting the rotational force of the electric motor (motor) 5 with the drum drive belt 4.

  A drum air outlet 6 (exhaust side) for discharging the drying air 7 is provided at the rear of the drum, and behind the drum air outlet 6 is a cooling air 8 for cooling the drying air. A fan casing 10 that houses a heat exchange fan 9 that functions as a blower for generating (sucked from outside the machine body) and also serves as a heat exchange function for cooling the drying air 7 is disposed.

  The fan casing 10 is divided into a drying air side and a cooling air side by a labyrinth seal portion 11a composed of concentric ribs attached to the outer peripheral portion of the heat exchange fan and a labyrinth seal portion 11b of the fan case lid 12. It is partitioned.

  The outlet for dry air of the fan casing 10 communicates with the heater 3 through an M duct 13 and an F duct 14. The M duct 13 and the F duct 14 constitute a circulation air passage. The drying air that circulates in the drum and is discharged from the exhaust side is sent to the circulation air passage by the blower. The drying air that has circulated in the circulation air passage flows into the drum 2 from the intake side provided on the front side of the drum 2. A heater 3 provided in the circulation air passage and for heating the drying air is disposed adjacent to the intake side of the drum 2.

  15 is a heat exchange fan drive belt, 16 is a heat exchange fan pulley, 17 is a heat exchange fan support member, 18 is a door that opens and closes an opening for putting in and out the object to be dried provided in front of the outer frame 1, 19 Is a filter, 20 is a drum front fixing wall, and the drum 2 is rotatably fixed on its outer periphery.

  The heat exchanging fan 9 includes a heat exchanging portion 21 and a labyrinth seal portion 11a that partitions drying air and cooling air. The heat exchanging portion 21 is constituted by a blade having a corrugated cross section, and performs heat exchange between the drying air and the cooling air via the blade surface. By this heat exchange, water vapor in the drying air is condensed and dehumidified.

  An open / close lid 23 and a cam motor 25 are arranged in the F duct 14. The opening / closing lid 23 and the cam motor 25 constitute a lid opening / closing means. The lid opening / closing means is provided in the circulation air path so as to be located on the upstream side of the heater 3.

  When the open / close lid 23 is opened, the high-humidity drying air 7 flowing from the M duct 13 is discharged from the F duct hole 26 to the outside of the airframe, and the low-humidity outside air 22 from the F duct hole 26. Inhale (outside air). That is, when the lid opening / closing means is open, exhaust of drying air and supply of outside air are simultaneously brought into the circulation air passage. The ventilation amount by this exhaust and supply air is about half or less of the circulation amount circulating in the circulation air passage.

  The internal circuit of the controller 27 of the clothes dryer is as shown in FIG. 2, and is composed of a drive circuit, a microcomputer that takes in external signals from panel buttons and dryness detection means, a power supply circuit that receives power supply from a commercial power supply, and the like. In addition, the motor (motor) 5 of the induction motor, the heater 3, the cam motor 25, and the like are driven and controlled.

  As for the drying course of clothes, for example, as shown in the frame represented by C in the panel 28 shown in FIG. 3, a “standard” course for drying ordinary clothes, and “finishing” suitable for drying freshly dried clothes. Course, "Iron" course that ends with just the right moisturizing for ironing, and "Disinfection", "Sweater", "Blanket", "Before drying", "Zock" There is a drying course suitable for the type of material to be dried, such as a course.

  The operation method of the wind drying operation (wind drying course) is as follows. By pressing the “wind drying” button K in the 28C frame on the panel 28 in FIG. 3, the LED section (display 28L) on the left shoulder of the button shown in FIG. Lights up. There are two types of “wind drying” course times of 60 minutes and 120 minutes. The lighting time is 60 minutes and the blinking time is 120 minutes. When the “wind drying” button K is pressed, it changes from lighting → flashing → lighting →..., So either one is selected and the start button 28S is pressed to start operation.

  The operation of the wind drying course is executed according to the flowchart of the wind drying course (60 minutes) shown in FIG. The standard (hot air) drying course (heat drying operation) is performed according to the standard (hot air) drying course flowchart shown in FIG.

  When the wind drying course is selected by the above-described operation, the heater 3 is not energized, the opening / closing lid 23 is opened, and the electric motor (motor) 5 is rotated, so that the object to be dried 24 has a low humidity outside the body. The air to be dried is dried by absorbing the moisture in the material to be dried and circulating the air that has become high humidity through the F duct hole 26 and discharging it. The object to be dried is dried by a wind drying operation using cold air that is not energized by the heater, so that the fabric is hardly damaged and is suitable for drying clothes of fibers that are weak against heat.

  In such operation, the motor rotation speed is 1400 rotations. This rotational speed is a guideline when a commercial power supply of 50 Hz is energized with all waveforms.

  By increasing the motor rotation speed in this manner, the rotation speed of the drum 2 and the heat exchange fan 9 is increased. Therefore, it is possible to shorten the time by increasing the amount of the air 22 outside the machine body taken in from the opening / closing lid 23.

  Here, an example is shown in which the motor rotation speed is controlled to 1400 rotations. However, when full-wave operation is performed without rotation control (commercial power supply is full-waveform energization), 1570 rotations are obtained at 60 Hz, and the operation sound is slightly increased. However, since the drying time is further shortened, the effect of shortening the time can be obtained even when full-wave operation is performed.

  Regardless of whether or not the motor rotation speed is controlled, it is possible to reduce the mechanical force applied to the object to be dried by shortening the time by increasing the motor rotation speed from the current level. Due to the synergistic effect of the drying method that does not apply heat to the object to be dried, that is, drying only by wind, shrinkage and damage of the object to be dried can be greatly reduced.

  Even if it is only a small part during the drying process, if the heater is turned on, moisture evaporation progresses and it is effective for shortening the drying time. It is necessary to reduce the time without relying on it. As shown in FIG. 10, it is possible to shorten the drying time by increasing the air volume. Also, as shown in FIG. 11, if the motor rotation speed is increased, the air volume increases. The motor rotation speed was set to 1400 rotations.

  Here, “1400 revolutions only during the wind drying course” is set to 1 kg or less, which is usually 1/5 of the rated capacity, and the material of the fabric is the drying of the object to be dried. Because it is driving. That is, at such a capacity, as shown in FIG. 12, the maximum torque is 2 kg-cm even in a poultice where drying of an object to be dried does not proceed, so at any power frequency (50 Hz / 60 Hz). Since the operation can be performed at 1400 revolutions or more, the air volume increased from the beginning is performed, and the operation time of the wind drying by the cold air can be shortened.

  DESCRIPTION OF SYMBOLS 1 ... Outer frame, 2 ... Drum, 3 ... Heater, 4 ... Drum drive belt, 5 ... Electric motor (motor), 6 ... Drum air outlet, 7 ... Cooling air, 8 ... Dry air, 9 ... Heat exchange fan, 10 ... Fan casing, 11a ... Heat exchange fan side labyrinth seal, 11b ... Fan casing side labyrinth seal, 12 ... Fan casing lid, 13 ... M duct, 14 ... F duct, 15 ... Heat exchange fan drive belt, 16 ... Heat Replacement fan pulley, 17 ... Heat exchange fan support member, 18 ... Door, 19 ... Filter, 20 ... Drum front fixed wall, 21 ... Heat exchange part, 22 ... Air outside the machine, 23 ... Open / close lid, 24 ... To-be-dried object, 25 ... lid opening / closing means, 26 ... F duct hole, 27 ... controller, 28 ... panel.

Claims (1)

A drum that stores and rotates the object to be dried, a blower that circulates in the drum and sends the drying air discharged from the exhaust side of the drum, and the drying air discharged from the blower In a clothes dryer equipped with a circulation air passage that circulates to the intake side of the drum,
A clothes dryer, wherein the rotation speed of the electric motor for rotating the fan is set to 1400 rpm or more, and the wind drying operation is performed with cold air.

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