CN109750466B

CN109750466B - Clothes dryer and method for drying wool fabric

Info

Publication number: CN109750466B
Application number: CN201711064978.4A
Authority: CN
Inventors: 杨婷; 胡娟; 冶萍; 陈石开; 沈秀秀
Original assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Current assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Priority date: 2017-11-02
Filing date: 2017-11-02
Publication date: 2021-10-01
Anticipated expiration: 2037-11-02
Also published as: CN109750466A

Abstract

A method for drying woolen fabrics by a clothes dryer, wherein a control device controls the execution of a woolen fabric drying program, a motor drives a roller to rotate during the execution of the woolen fabric drying program, a heating device heats process air acting on the woolen fabrics, a condensing device condenses moisture in the process air, the roller is driven by the motor to rotate intermittently during the drying process, the rotating speed is controlled to be the minimum rotating speed which enables more than half of the woolen fabrics to be turned up and down within one rotation of the roller, and the roller continuously rotates for odd cycles and less than 5 cycles within each rotation period. A clothes dryer includes a control device configured to control a motor, a heating device, and a condensing device, so that wool fabrics can be dried by the above method.

Description

Clothes dryer and method for drying wool fabric

[ technical field ] A method for producing a semiconductor device

The present invention relates to a drying method of a dryer.

[ background of the invention ]

The scale arrangement directionality on the surface of the wool fabric and the high elasticity of the fiber enable the wool fabric to have felting property, namely, under the action of moist heat and chemical reagents, the fiber aggregate is gradually shrunk and compacted and mutually interpenetrated and entangled and interwoven and felted through repeated extrusion by mechanical external force. The characteristics of wool make it impossible for a general drying procedure to achieve good protection and even irrecoverable damage, so consumers need to dry wool fabrics naturally or to use a special wool drying procedure.

Some drying procedures use additional supports to hold the wool fabric in place in order to reduce mechanical damage from interaction between the fabric and the inner drum. The fixing mode reduces mechanical force damage, but the uppermost wool fabric bears high temperature for a long time, while the lower wool fabric bears relatively low temperature, and non-uniformity is easily caused. And because the fabrics are stacked still, hot air is not easy to enter the interior of the fabrics, so that the time required for drying is longer, and the quantity of the fabrics which can be dried in one time is less. And, because of needing extra accessories, the convenience is low, has reduced the possibility that users choose washing and drying to carry out continuously with the washing and drying machine.

[ summary of the invention ]

It is an object of the present invention to provide a drying process which is convenient and which causes as little damage as possible to the wool fabric.

In view of the above objects, the present invention provides a method for drying woolen textiles in a clothes dryer, in which a control device controls the execution of a woolen textile drying process, during which a motor drives a drum to rotate, a heating device heats process air acting on the textiles, and a condensing device condenses moisture in the process air, the drum is intermittently rotated by the motor during the drying process, the rotation speed is controlled to be a minimum rotation speed at which more than half of the textiles are turned upside down within one rotation of the drum, and the drum is continuously rotated by odd number of revolutions and less than 5 revolutions per one rotation period.

Mechanical force is one of the most important factors affecting felting of wool. By controlling the rotating speed and the number of the rotating cycles in such a way, the fabric can be turned over up and down in the lowest rotating speed as far as possible with the smallest number of the rotating cycles, so that the mechanical force is controlled in the lowest range as far as possible, and the probability of wool shrinkage and felting caused by the mechanical force factor is greatly reduced.

The rotation speed of the drum is important because if the rotation speed is lower than the minimum rotation speed for turning over more than half of the fabric in one rotation, the drum is required to rotate for more revolutions, the fabric needs to be rolled over more times, and the damage of the mechanical force is larger. In addition, the number of revolutions per revolution of the drum also needs to be controlled more tightly, since even a few revolutions may cause the fabric to be turned back to the initial state for a large part, whereas less than 5 revolutions, specifically 1 or 3 revolutions, is needed to apply as little mechanical force as possible to the fabric.

Through the rotary motion of the roller, the fabric is approximately turned over and redistributed up and down in each rotary period of the roller, so that the fabric is heated more uniformly, the drying efficiency is improved, and the shrinkage deformation caused by the high temperature on the surface of the upper layer for a long time is avoided. Meanwhile, air enters the fabric more in the process of throwing and dropping the fabric, so that the dried fabric is more fluffy.

Preferably, the ratio of the time of rotation to standstill in each period of intermittent rotation is less than 1%. Due to the adoption of the extremely low rotation-stop ratio, the fabric keeps a static state in the roller in most of time, hot air can penetrate through the load to take away moisture in the period, and meanwhile, the fabric is turned over in the roller by extremely little rotation, so that the drying uniformity is improved, and the damage of high-temperature airflow to local parts is reduced.

Preferably, the control means controls the heating means such that the process air temperature alternates between a first, higher temperature and a second, lower temperature. The moisture in the fabric can be evaporated more quickly by the process air with higher temperature, and the temperature can be reduced to realize the cooling and condensation in advance in the cylinder, so that the time and the energy consumption are saved, and meanwhile, the wool fabric is prevented from being shrunk and felted under the condition of high temperature for a long time.

Preferably, the process air temperature is alternated between a first, higher temperature and a second, lower temperature by intermittently turning the heating means on and off.

Preferably, the control device may also control to operate the cotton fabric drying program, and the first temperature is lower than a heating temperature of the process air in the cotton fabric drying program. Wool is very sensitive to temperature in a wet state and under mechanical force, shrinkage and felting are easily generated at high temperature, and therefore, the temperature of wool fabrics in the whole drying process needs to be controlled in a lower temperature range.

Preferably, the maximum load of the wool fabric drying program is less than the maximum load of the cotton fabric drying program. Therefore, the moisture content of the air in the drum is always at a lower level, and the better drying efficiency can be realized at a lower temperature. Moreover, the small load ensures that the hot air can better penetrate through the fabric to enter the inside, so that the temperature difference between the inside and the outside of the wool fabric is small, and the phenomena of deformation and uneven drying are reduced.

The present invention also provides a clothes dryer including a drum, a motor driving the drum to rotate, a heating device heating process air acting on fabrics, and a condensing device condensing moisture in the process air, and a control device configured to control the motor, the heating device, and the condensing device, so that wool fabrics can be dried by the above method.

The wool drying machine adopts reasonable temperature setting and weakened roller action, reduces the damage to wool fabrics as much as possible, and simultaneously ensures that the drying is more uniform and the touch feeling is more fluffy. In addition, the invention does not need to use a fixed bracket, and is convenient and fast to operate.

[ description of the drawings ]

FIG. 1 is a schematic view of a dryer;

fig. 2 is a graph showing the air temperature and the drum rotation speed during the wool drying process.

[ detailed description ] embodiments

As shown in fig. 1, the dryer 100 has a drum 4 rotatably driven by a motor 2. The fabric is washed and/or dried in the drum 4. A tub 6 is provided around the drum 4. The drum 4 is in spatial communication with the tub 6, between which air can flow freely. Both ends of the process air channel 8 communicate with the outer tub 6 to supply heated process air to the outer tub 6 and condense the process air containing evaporated moisture from the outer tub 6 to separate moisture therefrom. Wherein the process air channel 8 comprises a condensation channel 12, a fan 14, and a heating channel 16. The cooling water passage 13 is connected to the condensation passage 12. In other embodiments, the cooling water passage may be replaced by another cooling medium. The condensation duct 12 and the refrigerant constitute a main part of the condensation device. The fan 14 functions to circulate air in the outer tub 6 and the process air passage 8. A heating device 17 is arranged in the heating channel 16 for heating the process air passing through the heating channel 16. The dryer 100 further includes a control device 10 in which a plurality of programs including a wool fabric drying program, a cotton fabric drying program, etc. are preset, and controls the motor 2, the fan 14, the heating device 71, the cooling water supply of the cooling water passage 13, etc. according to the settings of the programs during the operation of the programs. Wherein the maximum load capacity of the wool fabric drying procedure is less than the maximum load capacity of the cotton fabric drying procedure.

In the operation process of the wool fabric drying program, the motor 2 drives the roller 4 to rotate; the heating device 17 heats the process air acting on the fabric; the cooling water in the condensation channels 12 condenses moisture in the process air.

As shown in fig. 2, during the drying process, the control device 10 monitors the temperature of the process air and alternates the process air temperature between a first, higher temperature T1 and a second, lower temperature T2 by intermittently turning the heating device 17 on and off. For example, the first temperature T1 may be implemented as 90 degrees celsius and the second temperature T2 may be implemented as 70 degrees celsius. Wherein monitoring the temperature of the process air may be achieved by providing a temperature sensor in the drum 4, at the inlet of the condensation channel 12 or at the outlet of the heating channel 16. Wherein the first temperature T1 is lower than the heating temperature of the process air in the cotton fabric drying program. The lower temperature can protect the wool fabric and reduce or avoid the damage and deformation of the wool fabric in the drying process. A first curve S1 in fig. 2 illustrates a temperature change of the process air during the operation of the wool fabric drying process.

Meanwhile, the drum 4 is regularly switched between rotating and stationary for a plurality of times by the driving of the motor 2 during the operation of the wool fabric drying course. The ratio of the time of rotation to the time of rest in each period of intermittent rotation is less than 1%. And the drum 4 is rotated for an odd number of revolutions per one revolution, and less than 5 revolutions. Generally, 1 week or 3 weeks is preferred. For example each turn lasting only 3 seconds with intervals of 8-10 minutes. In this way, the fleece fabric is left at rest for most of the time and is turned over only a very limited number of times in a very short time, thereby minimizing shrinkage and felting due to mechanical forces.

In order to turn the fabric up and down within a limited number of revolutions of the drum 4, the speed of rotation of the drum 4 is controlled to a minimum speed at which more than half of the fabric is turned up and down within one revolution of the drum 4. This minimum rotational speed is preset in the control device 10. This minimum rotational speed is closely related to the diameter of the drum. The minimum rotating speed of the rollers with different diameters can be different when more than half of the fabric is turned up and down. This minimum rotational speed can then be obtained experimentally beforehand. In the experimental process, a plurality of marks can be respectively arranged on the upward surface A and the downward surface B of the wool fabric in the roller 4 when the wool fabric is static, and dynamic image recording is carried out.

The second curve S2 in fig. 2 shows the state of the drum 4 during the operation of the woollen cloth drying program, wherein the drum 4 is in a stationary state during the time interval t of each cycle, while the rotating state cannot be represented in intervals on the picture because the time is extremely short, and only the rotation speed is shown.

The various embodiments described above and shown in the drawings are illustrative of the invention and are not exhaustive of the invention. Any modification of the present invention by a person of ordinary skill in the related art within the scope of the basic technical idea of the present invention is within the scope of the present invention.

Claims

1. A method for drying woollen cloth in a dryer, a control device controlling execution of a woollen cloth drying process in which a motor drives a drum to rotate, a heating device heating process air acting on the cloth, and a condensing device condensing moisture in the process air, characterized in that: in the drying process, the drum is driven by the motor to rotate intermittently, the rotating speed is controlled to be the minimum rotating speed which enables more than half of the fabric to be turned up and down in one rotation of the drum, and the drum rotates for odd cycles and less than 5 cycles continuously in each rotation cycle.

2. The method of claim 1, wherein: the ratio of the time of rotation to the time of rest in each period of intermittent rotation is less than 1%.

3. The method of claim 1, wherein: the control device controls the heating device such that the process air temperature alternates between a first, higher temperature and a second, lower temperature.

4. The method of claim 3, wherein: the process air temperature is alternated between a first, higher temperature and a second, lower temperature by intermittently turning the heating device on and off.

5. The method of claim 3, wherein: the control device can also control the operation of the cotton fabric drying program, and the first temperature is lower than the heating temperature of the process air in the cotton fabric drying program.

6. The method of claim 5, wherein: the maximum load capacity of the wool fabric drying procedure is less than the maximum load capacity of the cotton fabric drying procedure.

7. A clothes dryer comprising a drum, a motor for driving the drum to rotate, heating means for heating process air applied to fabric, and condensing means for condensing moisture in the process air, characterized in that: further comprising control means arranged to control the motor, the heating means and the condensing means so that the wool textiles can be dried according to the method of any of claims 1 to 6.