KR101287537B1 - Washing machine and method to control spin-drying thereof - Google Patents

Abstract

The present invention relates to a washing machine and a dehydration control method for improving dehydration performance while minimizing dehydration time.

To this end, the present invention is a drum for receiving a cloth; A motor for rotating the drum; A hot air supply device for supplying hot air into the drum; After the primary dehydration at the set rotational speed by controlling the motor, the secondary air dehydration is performed to lower the motor rotational speed and then rise again to the set rotational speed, wherein the hot air supply device is connected between the primary dehydration and the secondary dehydration section. And a control unit for controlling and supplying hot air into the drum.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine,

The present invention relates to a washing machine, and more particularly, to a washing machine and a dehydration control method for improving the dehydration performance while minimizing the dehydration time.

In general, a washing machine (usually a drum washing machine) includes a water tank for desalination of water (washing water or rinsing water), a drum rotatably installed inside the water tank to accommodate a laundry cloth (hereinafter, referred to as pores), Including a motor for generating a driving force for rotating the drum is a device for washing is carried out by the operation of the inside of the drum to rise and fall along the drum inner wall when the cylindrical drum rotates.

These washing machines have a washing stroke that separates the contamination of the fabrics with detergent-dissolved water (specifically, wash water) and a rinse that rinses the foam or residual detergent with water without detergent (specifically, rinsing water). Washing is performed by a series of operations, such as a stroke and a dewatering stroke for dewatering the fabric at high speed. Washing machines sold in Europe require energy / laundry / dewatering performance (eg 'AAB') on the label, and the higher the performance, the higher the retail price. I want to get 'AAA'. Since the dehydration performance is proportional to the rotational speed, the 'B' grade is common for the 1400rpm model.

Recently, some companies have responded by increasing the dehydration time at the highest rotation speed in order to improve the dewatering performance of the 1400rpm model.

1 is a graph showing a change in dehydration time to increase the maximum rotational time by the conventional dehydration method, +1 time at the highest rotational speed (1400rpm holding time) when entering the dehydration stroke and reaches the highest rotational speed (1400rpm) Changes in dehydration time are increased to minutes, +2 minutes, +3 minutes ... etc.

Figure 2 is a table showing the change in dehydration performance when the maximum rotational speed is increased by the conventional dehydration method, the time (1400rpm holding time) at the maximum rotational speed +1 minute, +2 minutes, +3 minutes ... etc. It can be seen that even with increasing the dehydration performance (RMC: the amount of water remaining in the sachet) does not show a big difference.

As described above, the conventional dehydration method of increasing the dehydration time at the maximum rotational speed is not much improvement of the dehydration performance as the dehydration time is increased, but rather, there is a problem that the energy consumption is accompanied by the increase of the dehydration time, and also as the washing motor. In the case of a washing machine using a universal motor, there is a problem in that the life of the brush is shortened by increasing the dehydration time.

The present invention is to solve the conventional problems as described above, an object of the present invention is to reduce the rotational speed after the first dehydration at the highest rotational speed of the secondary dehydration to increase the rotational speed again after draining the dehydrated water It is to provide a washing machine and a dehydration control method for improving the dehydration performance.

Another object of the present invention is to provide a washing machine and a dehydration control method capable of further improving dewatering performance by supplying hot air in a section in which the rotational speed is lowered and then raised again after the first dehydration.

Washing machine of the present invention to achieve the above object is a drum for receiving a cloth; A motor for rotating the drum; A hot air supply device for supplying hot air into the drum; After the primary dehydration at the set rotational speed by controlling the motor, the secondary air dehydration is performed to lower the motor rotational speed and then rise again to the set rotational speed, wherein the hot air supply device is connected between the primary dehydration and the secondary dehydration section. And a control unit for controlling and supplying hot air into the drum.

In addition, the control unit to increase the motor to the set rotation speed to control the lowering the motor rotation speed to a low speed rotation speed that can be smoothly drained after the first dehydration to rotate the drum at high speed do.

The control unit may control to increase the motor speed again until the set speed when the motor speed is lowered to reach the low speed.

The controller may increase the motor speed to the predetermined speed and then perform secondary dehydration by maintaining a predetermined time at the set speed.

In addition, the present invention provides a control method of a washing machine including a drum accommodating a cloth and a motor for rotating the drum, wherein the motor is driven to a predetermined rotational speed to perform primary dehydration for rotating the drum at high speed. ; Lowering the motor speed after the first dehydration to rotate the drum at a lower speed than the high speed rotation; Sensing the motor rotational speed at low speed to increase the motor rotational speed to the set rotational speed when the low speed rotational speed is reached, and performing secondary dehydration for rotating the drum at high speed.

The present invention may further include supplying hot air into the drum in a section in which the motor speed is lowered to the low speed after the first dehydration and then increased again to the set speed.

In addition, the step of supplying hot air into the drum, characterized in that for supplying the hot air into the drum in the low speed rotation by operating the hot air supply device during the low speed rotation of the drum.

The washing machine and the dehydration control method according to the present invention improves the basic dewatering performance by the second dehydration to increase the rotational speed after the first dehydration at the highest rotational speed to lower the rotational speed to drain the dehydrated water, the rotation Dehydration performance can be further improved by supplying hot air together in the section where the number is lowered and then raised again.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention can be applied to any model equipped with a general washing machine (Air Wash) or a drying function. This is because the washing machine of the present invention should have a structure for supplying hot air while proceeding with dehydration in order to improve dehydration performance. 3 illustrates an example of a washing machine having a drying apparatus capable of supplying hot air for carrying out the present invention.

3 is a cross-sectional view showing the configuration of a washing machine with a drying apparatus according to an embodiment of the present invention.

In FIG. 3, a washing machine equipped with a drying apparatus of the present invention includes a drum-shaped water tank 11 installed inside the main body 10 for fresh water of washing water (washing water and rinsing water), and the inside of the water tank 11. It is rotatably installed on and includes a rotating drum 12 formed with a plurality of dehydration holes.

The lower part of the water tank 11 is provided with a motor 13 for rotating the rotating drum 12 in the forward or reverse direction to perform the washing, rinsing, and dehydration operations, and in the lower side of the water tank 11 when the user selects the water temperature (11) A washing heater 16 for heating the water supplied to the inside (specifically, washing water) is provided.

In addition, an opening 14 is formed at the front of the water tank 11 and the rotating drum 12 so that the user can pull out the cloth from the front of the main body 10, and to open and close the opening 14 at the front of the main body 10. The door 15 is installed.

The upper part of the water tank 11 is provided with a detergent supply device 18 for supplying detergent and rinsing agent, and a water supply device 20 for supplying water (washing water and rinsing water).

Detergent supply device 18 is divided into a plurality of spaces inside, it is installed on the front side of the main body 10 to facilitate the user to put detergent and rinsing agent in each space.

In addition, the water supply device 20 includes a water supply pipe 22 for supplying water and a water supply valve 24 installed in the water supply pipe 22 so as to control the water supply of the water supply pipe 22, and the water supply pipe 22 is provided from the outside. It is connected with the detergent supply device 18 so that the water supplied can be supplied toward the detergent supply device 18. And a separate connection pipe 26 is installed between the detergent supply device 18 and the water tank 11 so that the water passed through the detergent supply device 18 can be supplied to the water tank 11 together with the detergent. At the outlet of 26, a water supply nozzle 28 is provided. This allows the detergent in the detergent supply device 18 to be supplied to the water tub 11 in a state in which the detergent is dissolved in the water.

The present invention also includes a drainage device (30) for draining water inside the water tub (11). The drainage device 30 includes a drainage pipe 31 connected to a lower portion of the water tub 11 so as to guide the water in the water storage tank 11 to the outside and a drainage pump 32 installed in the drainage pipe 31.

In addition, the present invention includes a drying device 40 (hot air supply device) for drying clothes (laundry). The drying device 40 is provided between the discharge port 41b of the fan 41 and the air inlet 45 formed on the upper side of the opening 14 of the water tank 11, A condensing duct 43 mounted at the rear of the water tub 11 to connect the air duct 46 formed at the rear lower portion of the water tub 11 and the suction port 41a of the fan 41, And a drying heater 44 installed inside the drying duct 42 to generate high temperature air supplied into the rotary drum 12. [

In addition, the inside upper portion of the condensation duct 43 inside the condensation duct 43 so that hot and humid air generated through drying of the cloth (laundry) can be condensed and removed during the passage of the condensation duct 43. A spray nozzle 47 for spraying condensate (cold water) is provided. The spray nozzle 47 is connected to the water supply device 20 through a condensate supply line 48 and a condensate valve 49 to supply condensate.

Therefore, the condensed water sprayed from the upper spray nozzle 47 flows down to the lower side along the inner surface of the condensed duct 43, so that the contact between the hot and humid air rising from the lower part and the condensed water is increased, .

In addition, a discharge port 43a for discharging the condensed water is formed at the lower side of the condensation duct 43 so that the condensed water discharged through the discharge port 43a flows into the drain hose 31 of the drainage device 30. do.

The operation of the washing machine equipped with the drying device is as follows.

When the washing machine is operated by putting the cloth in the rotary drum 12, the water supply valve 24 of the water supply device 20 opens and water (washing water) passes through the water supply pipe 22 and the detergent supply device 18. Supplied to (11).

When the water supply operation is completed, the washing heater 16 is operated and the washing water filled in the water tub 11 is heated to a necessary temperature for washing, and then the rotary drum 12 is rotated in the forward or reverse direction by the driving of the motor 13 Washing is performed by the frictional force with the rotary drum 12 and the decomposition force of the detergent.

After washing is completed, dehydration is performed by high-speed rotation of the rinsing and rotating drum 12 about 1 to 5 times of repeating water supply and drainage.

Subsequently, when the drying heater 44 and the fan 41 are operated in a state in which the rotating drum 12 rotates slowly by the operation of the motor 13 to dry the cloth, the air inside the rotating drum 12 condenses. After being sucked toward the fan 41 through the duct 43, the circulation discharged into the rotating drum 12 through the drying duct 42 is repeated.

At this time, the air of the drying duct 42 is heated by the drying heater 44 and introduced into the rotary drum 12 in a state of high temperature drying, and the fabric inside the rotary drum 12 is heated by high temperature dry air (hot air). As it heats up, the moisture contained in the fabric evaporates to dryness.

In this drying process, the hot dry air absorbs moisture from the wet cloth and is converted into hot and humid air and is transferred to the condensation duct 43, and the hot and humid air transferred to the condensation duct 43 is injected through the injection nozzle 47. The condensed water (cold water) is injected into the condensation is changed to dry air, and the dry air is heated again in the drying heater 44 to repeat the process of flowing into the rotating drum 12 to dry the cloth.

4 is a control configuration diagram of a washing machine according to an embodiment of the present invention, the input unit 100, the water level detecting unit 110, the temperature detecting unit 120, the dry detecting unit 130, the control unit 140, the driving unit ( 150) and the rotation speed sensing unit 160 is configured.

The input unit 100 inputs driving information such as a washing course selected by the user, washing temperature, dehydration rpm, and rinsing addition to the controller 140, and the water level detecting unit 110 measures the level of water supplied to the water tank 11. The temperature sensing unit 120 detects the temperature of the water supplied to the water tank 11, and the dryness sensing unit 130 detects the temperature and humidity of the cloth to detect the dry state of the cloth.

The control unit 140 is a microcomputer that controls the washing machine according to the driving information input from the input unit 100, and the rotation speed of the motor 13 reaches the set rotation speed (the maximum rotation speed in the washing machine of the present invention, about 1400 rpm). The hot water is supplied together in the primary dewatering section for dewatering the gun at high speed and in the section where the brake is applied to the motor 13 after the first dehydration to lower the low speed (98 rpm) and then rises again to the set speed (about 1400 rpm). It is divided into a hot air supply section, and a secondary dehydration section that maintains a predetermined time (maximum rotation time holding time, about 5 minutes in the case of the washing machine of the present invention) after the rotation speed of the motor 13 reaches the set rotation speed. To control.

The hot air supply section lowers the rotation speed of the motor 13 to the low speed rotation speed (about 98 rpm) after the first dehydration so that the water dewatered by the water tank 11 is smoothly drained without turning along the inner wall surface of the water tank 11. The hot air is supplied to the inside of the rotating drum 12 through the drying duct 42 by operating the fan 41 and the drying heater 44 in a section where the motor 13 rotates again to a set rotation speed (about 1400 rpm). Be sure to

The driving unit 150 includes the motor 13, the washing heater 16, the water supply valve 24, the drainage pump 32, the fan 41, the drying heater 44, and the condensed water according to the driving control signal of the controller 140. In order to drive the valve 49 and the like, the rotation speed detection unit 160 detects the rotation speed of the motor 13 and detects the rotation speed of the motor 13 and inputs it to the controller 140.

Hereinafter, the operation and effect of the washing machine and its dewatering control method constructed as described above will be described.

5A and 5B are flowcharts illustrating a dehydration control operation procedure of a washing machine according to an embodiment of the present invention. The dehydration control method of the present invention relates to a dehydration operation for improving dewatering performance in a washing machine having a drying apparatus.

First, if it is determined that the operation of the washing machine is a dehydration operation (200), and in the case of the dehydration operation, the control unit 140 drives the motor 13 through the driving unit 150, and the rotating drum 12 according to the driving of the motor 13. ) Starts the dewatering rotation (202).

When the dehydration rotation of the rotating drum 12 starts as the motor 13 is driven, the rotation speed of the motor 13 starts to increase, and the rotation speed sensing unit 160 detects the rotation speed of the motor 13 at this time. Input to the controller 140.

Accordingly, the controller 140 determines whether the rotation speed of the motor 13 detected through the rotation speed detection unit 160 reaches a predetermined set rotation speed (maximum rotation speed, about 1400 rpm) (204) and rotates the motor 13. When the number reaches the set rotation speed, as shown in FIG. 6, the primary dewatering is performed to maintain the rotation speed of the motor 13 to dewater the fabric at high speed (206).

After that, when the primary dehydration section passes (208), the controller 140 brakes the motor 13 to drop the rpm to lower the rotation speed of the motor 13 (210). When the rotation speed of the motor 13 is lowered, the rotating drum 12 rotates at a low speed so that water dewatered into the water tank 11 by high speed dewatering in the primary dewatering section is smoothly drained without turning along the inner wall surface of the water tank 11. Dehydration rate is high.

At the same time, the control unit 140 operates the fan 41 and the drying heater 44 of the drying apparatus 40 to start the hot air supply for supplying hot air from the drying duct 42 into the rotating drum 12 ( 212).

In this way, the dehydration performance of the fabric can be further improved by supplying hot air into the rotating drum 12 while lowering the rotation speed of the motor 13 so that the dehydrated water can be smoothly drained.

At this time, the control unit 140 detects the rotation speed of the motor 13 lowered by applying the brake to the motor 13 through the rotation speed detection unit 160 to rotate the motor 13 at a predetermined low speed rotation speed (about 98 rpm). It is determined whether it has reached 214.

As a result of the determination in step 214, when the motor 13 rotational speed reaches the low speed rotational speed, the control unit 140 raises the motor 13 rotational speed again as shown in FIG. 6 (216), and rotates the motor 13. As the number of motors is increased again, the speed of the motor 13 that is increased is sensed through the speed detecting unit 160 to determine whether the set speed (the maximum speed, about 1400 rpm) has been reached (218).

When the rotation speed of the motor 13 reaches the set rotation speed, the controller 140 stops the supply of hot air by stopping the fan 41 and the drying heater 44 of the drying apparatus 40 (220). This is to reduce unnecessary energy consumption because hot air is not properly supplied into the rotating drum 12 as the rotating drum 12 rotates at a high speed when the number of rotations of the motor 13 reaches the set rotation speed.

Then, when the motor 13 rotation speed reaches the set rotation speed (maximum rotation speed), the control unit 140 maintains the rotation speed of the motor 13 so as to dehydrate the fabric at high speed as shown in FIG. 6. Proceed to step 222. As a result of applying the dehydration control algorithm of the present invention, it was confirmed that the dehydration performance (RMC: the amount of water remaining in the cloth) is improved by more than 10% (42.7%) compared with the conventional (47.3%).

Thereafter, the controller 140 determines whether the secondary dehydration section has elapsed (224), and when the secondary dehydration section has elapsed, stops the motor 13 (226) and ends the dehydration operation.

The dehydration time of the secondary dewatering section may change the holding time at the highest rotational speed according to the capacity or structure of the washing machine.

In addition, in the present invention, the set rotation speed is set as the maximum rotation speed (about 1400 rpm) using the washing machine applied to the present invention as an example, but the set rotation speed is a change of the designer according to the capacity or structure of the washing machine.

1 is a graph showing a change in dehydration time to increase the maximum rotational time in the conventional dehydration method.

Figure 2 is a table showing a change in dehydration performance when the maximum rotational time is increased by the conventional dehydration method.

3 is a cross-sectional view showing the configuration of a washing machine with a drying apparatus according to an embodiment of the present invention.

4 is a control block diagram of a washing machine according to an embodiment of the present invention.

5A and 5B are flowcharts illustrating an operation procedure of dehydration control of a washing machine according to an embodiment of the present invention.

Figure 6 is a dehydration control operation graph of the washing machine according to an embodiment of the present invention.

Description of the Related Art [0002]

11: tank 12: rotating drum

13: motor 20: water supply device

40: drying device 41: fan

42: drying duct 44: drying heater

140: control unit 160: rotation speed detection unit

Claims (7)

A drum for receiving the can; A motor for rotating the drum; A hot air supply device for supplying hot air into the drum; After the primary dehydration at the set rotational speed by controlling the motor, the secondary air dehydration is performed to lower the motor rotational speed and then rise again to the set rotational speed, wherein the hot air supply device is connected between the primary dehydration and the secondary dehydration section. Washing machine including a control unit for controlling and supplying hot air into the drum. The method of claim 1, The control unit is to increase the motor to the set rotation speed washing machine for controlling to lower the motor rotation speed to a low speed rotation speed that can be smoothly drained after the first dehydration to rotate the drum at high speed. 3. The method of claim 2, The control unit is a washing machine for controlling to increase the motor rotation speed up to the set rotation speed when the motor rotation speed is lowered to reach the low speed rotation speed. The method of claim 3, The control unit is to increase the motor rotational speed to the predetermined rotational speed and to maintain a predetermined time at the set rotational speed to perform the second dehydration. A control method for a washing machine having a drum for containing a cloth and a motor for rotating the drum, Raising the motor to a set rotation speed to perform first spin dehydration to rotate the drum at high speed; Lowering the motor speed after the first dehydration to rotate the drum at a lower speed than the high speed rotation; And sensing the motor rotational speed at low speed to increase the motor rotational speed to the set rotational speed and performing secondary dehydration for rotating the drum at high speed. The method of claim 5, And dehydrating the motor speed after the first dehydration to the low speed speed and then supplying hot air into the drum in a section in which the motor speed is increased again to the set speed. The method of claim 6, Supplying hot air into the drum, The dehydration control method of the washing machine for supplying hot air into the drum during the low speed rotation by operating a hot air supply device during the low speed rotation of the drum.

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