JP2012055399A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance washing effect by removing dirt in fibers with washing water even when the amount of laundry is small.SOLUTION: A drum-type washing machine comprises: a motor 7 for rotationally driving a drum 3; cloth amount detection means (not illustrated) for detecting the amount of laundry loaded into the drum 3; and control means 24 for controlling the driving of the motor 7. In the step of washing the laundry, the control means 24 switches rotation between low-speed rotation where the laundry can tumble in the drum 3 and high-speed rotation where the laundry clings to the inner peripheral surface of the drum 3, and is set so as to increase the number of revolutions during the high-speed rotation when the amount of the laundry detected by the cloth amount detection means (not illustrated) is small.

Description

  The present invention relates to a drum type washing machine for washing laundry such as clothes.

  Conventionally, this type of drum-type washing machine repeatedly rotates a drum loaded with laundry in a forward and reverse direction at a low speed and repeatedly lifts the laundry in the drum and drops it. Washing is performed by so-called washing, in which dirt is removed by impact when dropping from the top of the drum by rotation.

  When the amount of laundry is large, it is difficult to uniformly wet the laundry put in the drum, and thus uneven washing occurs. In addition, there is a problem in that the bulk of the laundry increases, so that the falling distance in the drum is reduced, the tumbling effect is lowered, and the washing performance is lowered. Therefore, in order to solve such a problem, in the washing process, the washing is performed by rotating the drum at a low speed at which tumbling can be performed and the drum is rotated at a high speed at which the laundry is stuck in the drum. It is considered that the washing is performed by centrifugal force due to the above, and it is considered that the number of rotations of the drum is changed during the washing according to the amount of the laundry (for example, refer to Patent Document 1).

  FIG. 7 is a cross-sectional view of a conventional drum-type washing machine described in Patent Document 1. As shown in FIG. 7, a bottomed cylindrical drum 53 is provided in a receiving cylinder 52 disposed in a casing 51 so as to be able to rotate forward and backward. A motor 54 is attached to the lower portion of the receiving cylinder 52, a motor pulley 55 attached to the drive shaft of the motor 54 rotates, and power is transmitted to the drive pulley 57 attached to the rotation shaft of the drum 53 via the drive belt 56. The drum 53 is rotated by being transmitted.

  The washing water is supplied to the receiving cylinder 52 by the water supply valve 58, and the washing water in the receiving cylinder 52 is drained from the drainage port 61 through the drainage valve 60 to the outside of the machine. A door 62 that can be freely opened and closed is provided on the front surface of the housing 51, and the laundry 64 can be taken in and out through a clothing insertion port 63 that opens on the front surface side of the drum 53.

  The operation at the time of washing in the drum type washing machine having the above configuration will be described with reference to the time chart of FIG. The amount of laundry put in the drum 53 is detected, and the washing water set in accordance with the amount is supplied into the receiving cylinder 52 from the water supply valve 58, and then the motor 54 is driven.

  In order to make the laundry contain water, the drum 53 is rotated at a rotational speed (for example, 50 rpm) at which the laundry can be tumbled in the drum 53, and after the first washing process is performed, The drum 53 is rotated at a rotational speed (for example, 200 rpm) for squeezing and washing, and the second washing process is performed. In the washing process, the first washing process and the second washing process are alternately repeated.

JP-A-8-299658

However, in the above-described conventional configuration, the first washing step of rotating the drum 53 at a rotation speed at which the laundry can be tumbled in the drum 53 in order to cause the laundry to contain the washing water, and the rotation speed for squeezing and washing. Since the second washing process for rotating the drum 53 is predetermined by the amount of laundry put in, the washing effect can be improved within a limited time of the limited washing process and in a shorter time. There was a problem that was difficult.

  In addition, when the rotation speed of the drum 53 is varied according to the amount of laundry, the rotation speed is lowered when the amount of laundry is small, and the rotation speed is increased when the amount of laundry is large. When the amount of laundry is large, the weight distribution in the drum 53 is likely to be unbalanced depending on the type of laundry such as longitudinal clothing or large clothing, and the amount is set as the rotational speed of the drum 53 increases. It takes a long time to reach a high rotational speed, and it is difficult to reach the rotational speed itself.

  On the other hand, when the amount of laundry is small, the centrifugal force applied to the laundry is small when the rotational speed is low, and there is a problem that it is difficult to remove dirt in the fibers contained in the laundry together with the washing water.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a drum type washing machine having excellent washing performance even when the amount of laundry is small in a limited washing process time.

  In order to solve the above-described conventional problems, a drum-type washing machine of the present invention includes a motor that rotationally drives a drum, a cloth amount detection unit that detects the amount of laundry put in the drum, Control means for controlling the drive, the control means in the step of washing the laundry, the low-speed rotation that allows the laundry to tumbl in the drum, and the high-speed rotation that the laundry sticks to the inner peripheral surface of the drum When the amount of laundry detected by the cloth amount detecting means is small, the number of rotations at the time of high-speed rotation is set to be high.

  As a result, it is possible to remove dirt from garment fibers by tumbling and high-speed rotation. In the subsequent washing process, dirt remaining in the garment fibers has already been washed. Stripping is promoted by chemical force and mechanical force by tapping, and it becomes possible to remove dirt from the fibers in a shorter time, and the cleaning performance can be improved in a limited short time. In addition, even when the amount of laundry is small, a sufficient centrifugal force can be applied to the laundry during high-speed rotation, so that dirt in the fibers can be removed together with the washing water, and the washing effect can be enhanced.

  The drum type washing machine of the present invention can remove dirt in the fibers together with the washing water even when the amount of laundry is small in the limited washing process time, and can enhance the washing effect.

Sectional drawing of the drum type washing machine in Embodiment 1 of this invention Time chart showing the operation of the washing process of the drum type washing machine Time chart showing the operation of the drum in the washing process of the drum type washing machine Time chart showing operation of drum type washing machine in embodiment 2 of the present invention The top view of the detergent charging device of the drum type washing machine in Embodiment 3 of this invention Time chart showing the operation of the drum type washing machine Sectional view of a conventional drum-type washing machine Time chart showing the operation of the washing process of the drum type washing machine

  According to a first aspect of the present invention, there is provided a receiving tube elastically supported in a housing, a bottomed cylindrical drum rotatably provided in the receiving tube, a water supply means for supplying washing water into the receiving tube, and the receiving device. Drainage means for draining the wash water into the cylinder, a motor for rotationally driving the drum, a cloth amount detection means for detecting the amount of laundry put into the drum, and a control means for controlling the drive of the motor And the control means switches between a low-speed rotation in which the laundry can be tumbled in the drum and a high-speed rotation in which the laundry sticks to the inner peripheral surface of the drum in the step of washing the laundry. When the amount of laundry detected by the amount detection means is small, by setting the number of rotations at high speed rotation to be high, washing by tumbling and removing dirt from the clothing fibers by high speed rotation Can Even in the subsequent washing process, dirt remaining in the clothing fibers has already been promoted by the chemical power of the washing water and the mechanical force of the washing. It becomes possible to remove, and the cleaning performance can be improved in a limited short time. In addition, even when the amount of laundry is small, a sufficient centrifugal force can be applied to the laundry during high-speed rotation, so that dirt in the fibers can be removed together with the washing water, and the washing effect can be enhanced.

  In particular, the second invention is provided with a detergent charging device for charging the detergent into the receiving cylinder of the first invention, and the control means drains the washing water into the receiving cylinder before the high speed rotation, and a new one after the high speed rotation. By supplying washing water and supplying a predetermined amount of detergent, new clean water penetrates into the fiber from which dirt has been removed by centrifugal force due to high-speed rotation, and the chemical action of the activated detergent With this, it is possible to accelerate the removal of dirt in the fiber and enhance the cleaning effect.

  In particular, the third invention is provided with a plurality of detergent containers in the detergent charging device of the second invention, and further includes a switching valve for switching the water supply path through which the washing water flows through each of the detergent containers. By switching between the water supply path that is supplied at the beginning of the washing process and the water supply path that is supplied when water is supplied after high-speed rotation, the amount of detergent that is supplied at the beginning of the washing process and the supply after the high-speed rotation process The amount of detergent to be used can be set optimally, and a predetermined amount of detergent can be introduced at a predetermined timing during the washing process to enhance the cleaning effect.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the configuration of a drum type washing machine according to the first embodiment of the present invention, FIG. 2 is a time chart showing the operation of the washing process, and FIG. 3 is the operation of the drum in the washing process. It is a time chart which shows.

  1 to 3, a receiving cylinder 2 elastically supported by a damper (not shown) or the like is provided in a casing 1 of a drum type washing machine. A bottomed cylindrical drum 3 is rotatably provided in the receiving cylinder 2 and its rotating shaft is inclined upward. A plurality of baffles 4 projecting inward in the direction of the rotation axis and a large number of through holes 5 communicating with the inside of the receiving cylinder 2 are provided on the inner peripheral side surface of the drum 3. An opening 6 is provided.

  A motor 7 that rotationally drives the drum 3 is attached to the rear surface of the receiving cylinder 2. The motor 7 is constituted by a brushless DC motor, and the rotation speed can be freely changed by inverter control. A water supply valve 8 serving as a water supply means for supplying washing water into the receiving cylinder 2 supplies the washing water into the receiving cylinder 2 via a detergent charging device 10 for supplying a detergent provided in the water supply channel 9. The washing water supplied into 2 flows into the drum 3 from the through hole 5.

The washing water in the receiving cylinder 2 can be circulated into the drum 3 by the first circulation pump 12 provided in the first circulation water channel 11. A suction portion 13 for sucking washing water communicating with the circulation water channel 11 is provided at the bottom of the receiving cylinder 2, and the washing water is discharged toward the inside of the drum 3 at the lower portion of the opening 6 provided on the front side of the drum 3. The discharge part 14 is provided in the.

  In the first circulation water channel 11, a first on-off valve 15 is provided on the upstream side of the first circulation pump 12, that is, between the suction portion 13 and the first circulation pump 12. A drainage channel 17 provided with a drainage valve 16 is connected to the first circulation channel 11 between the suction portion 13 and the first on-off valve 15.

  When the first circulating pump 12 is driven and the washing water in the receiving cylinder 2 is discharged from the discharge portion 14 into the drum 3, the drain valve 16 is closed and the first on-off valve 15 is opened. Washing water in the cylinder 2 can be sucked into the first circulation water channel 11 from the suction portion 13 and circulated into the drum 3 from the discharge portion 14.

  A water reservoir 18 is provided in the housing 1 to allow the washing water in the receiving cylinder 2 to flow into the housing 1. The water storage section 18 is disposed below the receiving cylinder 2 and is connected to the inside of the receiving cylinder 2 via an inflow path 19 connected to the first circulation water path 11 between the suction section 13 and the first on-off valve 15. It is connected. A second on-off valve 20 is provided in the inflow passage 19.

  The washing water in the water storage unit 18 can be circulated into the drum 3 by the second circulation pump 22 provided in the second circulation water channel 21. One of the second circulating water channels 21 is connected to the water storage unit 18, and the other of the second circulating water channels 21 has washing water on the top of the opening 6 provided on the front side of the drum 3 toward the inside of the drum 3. It is connected to the discharge part 23 provided so that it may discharge.

  When the second circulation pump 22 is driven and the washing water in the receiving cylinder 2 is discharged from the discharge portion 23 into the drum 3, the first on-off valve 15 and the drain valve 16 are closed, and the second on-off valve is opened. By opening the valve 20, the washing water in the receiving cylinder 2 can flow from the suction portion 13 into the water storage portion 18 through the inflow passage 19 and can be circulated from the discharge portion 23 into the drum 3 through the second circulation water passage 21. .

  When draining the wash water in the receiving cylinder 2, the first on-off valve 15 and the second on-off valve 20 are closed and the drain valve 16 is opened to allow the washing water in the receiving cylinder 2 to pass through the drain passage 17. It can be drained outside.

  The control means 24 provided in the housing 1 includes a motor 7, a water supply valve 8, a first circulation pump 12, a first on-off valve 15, a drain valve 16, a second on-off valve 20, and a second circulation pump 22. Etc. are driven, and each process such as washing, rinsing and dehydration is sequentially controlled.

  Note that the laundry can be taken in and out through the opening 6 provided on the front side of the drum 3 by opening the openable door 25 provided on the front surface of the housing 1.

  The operation and action of the drum type washing machine configured as described above will be described below. A door 25 provided to be openable and closable is opened on the front side of the housing 1, laundry is put into the drum 3 through the opening 6, and a power switch (not shown) of the operation unit 26 provided on the front upper surface of the housing 1 When the operation is started by operating a start switch (not shown), the amount of laundry put in is detected by a cloth amount detecting means (not shown).

  Although washing is performed in the order of a washing process, a rinsing process, and a dehydrating process, here, the washing process will be described in detail based on the time chart of FIG. 2, and the description of the rinsing process and the dehydrating process will be omitted. The washing process of the present invention is started following the determination of the amount of laundry loaded.

  The first of the washing process is a water supply process for introducing a preset amount of water into the receiving cylinder 2 and the drum 3 according to the detected weight of the laundry. In the first water supply step, first, the water supply valve 8 is opened, water is supplied from the water supply pipe, and water supply is started. The amount of water supply and each time of the washing operation are set in advance according to the weight of the laundry to be input.

  Washing water is supplied into the receiving cylinder 2 via the water supply passage 9 while dissolving a predetermined amount of detergent put into the detergent case 10, and the washing water supplied into the receiving cylinder 2 is discharged from the through holes 5. It flows into the drum 3.

  The washing water supplied to the receiving cylinder 2 enters the first circulation water channel 11 through the first on-off valve 15 opened from the suction portion 13 and reaches the first circulation pump 12. The amount of water supply is detected by a water level detection means (not shown). When a predetermined amount of washing water is supplied into the receiving cylinder 2, the first circulation pump 12 is driven to drum the washing water in the receiving cylinder 2. Circulate into 3.

  In the water supply 1 step, in addition to the wash water that enters the drum 3 from the through hole 5 due to the rise of the wash water level in the receiving cylinder 2, the first circulation pump 12 is driven to enter the drum 3 from the discharge portion 14. By discharging the washing water, the penetration of the washing water into the laundry can be accelerated. When it is detected by a water level detection means (not shown) that a set amount of washing water has been supplied into the receiving cylinder 2, the water supply valve 8 is closed to stop water supply.

  Next, following the water supply step 1, the stirring washing step 1 is executed for a predetermined time T1. As in the water supply 1 process, the stirring washing 1 process is a state in which the first on-off valve 15 is open, the second on-off valve 20 and the drain valve 16 are closed, and the first circulation pump (circulation pump) ) 12, the washing water in the receiving cylinder 2 is sucked from the suction portion 13 into the first circulation water passage (circulation water passage) 11 and discharged from the discharge portion 14 toward the laundry in the drum 3.

  In the stirring washing 1 process, the rotation speed of the drum 3 is such that the laundry is lifted along the rotation direction of the drum 3 by the baffle 4 provided in the drum 3 and falls from the upper part in the drum 3 by gravity, The rotation speed is set so as not to stick to the inner peripheral side wall surface of the drum 3 by centrifugal force so that mechanical force is effectively applied to the laundry, for example, 30 to 60 rpm, depending on the amount of laundry. However, it is preferably 50 rpm, and as shown in FIG. 3, the forward rotation and the reverse operation are alternately repeated.

  The predetermined time T1 for this stirring and washing process is set to 6 minutes, for example, so that the laundry is sufficiently wetted with the washing water, and the predetermined time T2 of the high-speed rotation process to be performed thereafter and the predetermined time of the stirring and washing process 2 It is set longer than T3. Note that the operation of the first circulation pump 12 that circulates the washing water may be either continuous or intermittent.

  It is preferable that the discharge unit 14 has a shape capable of diffusing and discharging the washing water in a fan shape so as to quickly wet the laundry with the washing water. In addition, the discharge unit 14 may be disposed below the opening 6 provided on the front side of the drum 3, and the washing water may flow into the drum 3 while flowing along the peripheral side wall surface of the drum 3. . In addition, when the drum 3 is rotated when the washing water is discharged, the change of the relative position of the laundry in the drum 3 can be promoted, and the laundry can be evenly wetted.

  Next, the high-speed rotation process is entered. In this high-speed rotation process, the first circulation pump 12 is stopped, the first on-off valve 15 is closed, and the second on-off valve 20 is opened to connect the receiving cylinder 2 and the water storage unit 18. The drain valve 16 remains closed.

When the second on-off valve 20 is opened and the washing water in the receiving cylinder 2 flows into the water storage section 18 from the inflow path 19, the second circulation pump (circulation pump) 22 is driven and the second circulation water path 21 is passed through. Washing water in the water storage unit 18 is discharged toward the laundry in the drum 3 from the discharge unit 23 located above the opening 6 provided on the front side of the drum 3.

  The rotation speed of the drum 3 in the high-speed rotation process is set to, for example, 150 to 400 rpm, and preferably 300 rpm so that the washing water contained in the laundry can be forcibly discharged by centrifugal force. .

  In this high-speed rotation process, as shown in FIG. 3, in the initial high-speed rotation, since the laundry is in a state of absorbing a large amount of washing water, the rotation speed increases only to about 200 rpm in about 30 seconds. Instead, once the rotation is stopped and the rotation speed has decreased, the drum 3 can be increased to about 300 rpm by rotating the drum 3 again at a high speed.

  Further, when the first high-speed rotation is stopped and the high-speed rotation is performed again, if the number of rotations of the drum 3 is reduced to the extent that the laundry in the drum 3 falls from the inner peripheral side surface of the drum 3, The relative arrangement of the laundry can be changed. In addition, although this high-speed rotation process is performed at least once in a washing process, it is preferable to carry out repeatedly continuously.

  Since the washing effect increases as the contact time between the washing water and the laundry becomes longer, the washing water is discharged toward the laundry in the drum 3 even in this high-speed rotation process. The washing water introduced by gravity is continuously discharged toward the laundry in the drum 3 by the second circulation pump 22.

  Accordingly, the washing water can be supplied to the laundry from the discharge portion 23 while removing the washing water between the fibers of the laundry by centrifugal force generated by rotating the drum 3 at a high speed. The washing effect is improved by replacing the washing water.

  In this high-speed rotation process, the amount of laundry put into the drum 3 is detected by a cloth amount detection means (not shown), and the number of rotations of the drum 3 at the time of high-speed rotation is determined according to the amount of laundry. Is set. When the amount of laundry is small, the rotation speed is high and the rotation speed is high, and as the amount of laundry increases, the rotation speed is low and the rotation speed is low.

This is due to the fact that the force for peeling off the dirt taken in by the surfactant in the wash water from the laundry in the high-speed rotation process is mainly based on the centrifugal force. That is, the centrifugal force F is expressed as “F = m × ω ² × r”, where m is the mass of the laundry including water, r is the distance from the center of the washing tub, ω is the angular velocity, and ω = 2πn (n is the number of rotations of the washing tub). And as this centrifugal force is larger, it becomes possible to remove the washing water in which the dirt component contained in the laundry is dissolved from the back of the clothing fiber together with the dirt component, and the washing water contained in the clothing is replaced during the washing process. Is promoted and the cleaning performance is enhanced.

  Considering the case where the amount of laundry increases, m in the above centrifugal force formula increases, while the volume of laundry in the laundry tub increases, so the space occupied by the clothing from the center of the laundry tub The average distance r to the center in the radial direction is small. Conversely, when the amount of laundry decreases, m decreases while r increases. However, the fluctuation range of r is ½ even if the case where the laundry is packed to the maximum without being attracted and the case where the laundry is as close as possible to the inner wall of the washing tub, for example, 9 kg and 2 kg of washing It does not become as large as the amount of change in quantity.

Here, assuming that there is a certain boundary condition in the centrifugal force for removing the washing water from the laundry, the reduced amount of the weight m of the laundry is compensated only by the distance r from the rotation center of the laundry tub. Therefore, it is necessary to increase the angular velocity ω, that is, the rotational speed n of the washing tub. On the contrary, since m is larger as the amount of laundry is larger, the same centrifugal force can be obtained even if the number of rotations is reduced, and dirt can be removed from the laundry.

  Table 1 shows the amount of laundry put into the drum 3 and the number of rotations in the high-speed rotation process. When the amount of laundry is less than 2 kg, the number of rotations is set to 800 rpm, for example. However, as the number increases, the rotational speed is set lower to 600 rpm to 400 rpm.

  Thus, even when there is little laundry and the centrifugal force acting on the laundry at high speed is small, the washing water can be sufficiently discharged from the laundry by rotating the drum 3 at high speed, so that dirt can be removed from the fibers. The dissolved washing water can be effectively removed.

  In general, when the amount of laundry is large, an imbalance of the weight distribution in the drum 3 is likely to occur. However, since the number of rotations decreases as the amount of laundry increases, the set rotation The number can be reached in a short time.

  Next, it enters into the 2nd water supply process. In the second water supply process, the second circulation pump 22 is driven following the high-speed rotation process, and the wash water in the water storage section 18 is supplied to the laundry in the drum 3 via the second circulation water channel 21. Then, the first on-off valve 15, the second on-off valve 20, and the drain valve 16 are closed, and washing water is stored at the bottom of the receiving cylinder 2. When the washing water in the water storage unit 18 completes the movement into the receiving cylinder 2, the stirring washing 2 step is executed.

  In the stirring and washing 2 step, as in the stirring and washing 1 step, the first on-off valve 15 is opened, and the drain valve 16 and the second on-off valve 20 are closed. Then, the first circulation pump 12 is driven. Wash water collected at the bottom of the receiving cylinder 2 is sucked by the first circulation pump 12 and discharged from the discharge portion 14 into the drum 3 via the first circulation water channel 11. At this time, the drum 3 rotates at a rotational speed that does not stick to the laundry and rolls in the drum 3, and as shown in FIG. 3, the forward rotation and the reverse operation are repeated alternately at 50 rpm.

  Following the high-speed rotation process, the two stirring and washing processes are performed for a predetermined time T3, so that the washing water in which the detergent is dissolved again fills the fibers of the laundry, and the chemical force of the detergent and the mechanical force accompanying the rotation of the drum 3 By this, it becomes possible to peel off the dirt substance remaining in the fiber. If the concentration of dirt substances in the wash water between the fibers is high, there is a concern about reattachment to the fibers, but it becomes possible to suppress reattachment by forcibly replacing the wash water between the fibers. .

  In the washing process of the present invention, the predetermined time T1 of the first stirring and washing process performed first is longer than the predetermined time T2 of the high-speed rotation process for rotating the drum 3 at a high speed, and the high-speed rotation process. It is set longer than a predetermined time T3 of the second stirring washing process performed later, and the relationship between the predetermined time T1 of the first stirring washing process and the predetermined time T3 of the second stirring washing process is T1> T3.

  This is because, in the washing process, the first step of stirring and washing, in addition to insufficient wetting of the laundry, conditions for the washing water to penetrate into the fibers of the laundry, or dirt from the fibers This is because the conditions at the time of peeling off are the most disadvantageous, and it takes more time than other stirring and washing steps that are performed, which is effective in enhancing the cleaning effect.

  Further, the number of high-speed rotation steps for rotating the drum 3 at high speed in the washing step is not particularly limited, but it is preferably performed a plurality of times as the number of times of washing water replacement increases. In this case, even if it is continuous, a stirring washing step or the like may be inserted between the high-speed rotation steps, and the timing may be discontinuous.

  As described above, the drum-type washing machine of the present invention has a low-speed rotation in which the laundry can be tumbled in the drum 3 and a high-speed rotation in which the laundry sticks to the inner peripheral surface of the drum 3 in the washing process. When the amount of laundry detected by the cloth amount detecting means is small, the number of rotations at high speed rotation is set to be high, and even when the amount of laundry is small, sufficient at high speed rotation The centrifugal force can be applied to the laundry so that dirt in the fibers can be removed together with the washing water, and the cleaning effect can be enhanced.

  Further, in the step of washing the laundry, the first circulation pump 12 is driven to circulate the washing water in the receiving cylinder 2 into the drum 3, so that the laundry can be tumbled in the drum 3 at a low speed, that is, washing. Switching between a low-speed rotation in which the article does not stick to the inner peripheral surface of the drum 3 and a high-speed rotation in which the laundry sticks to the inner peripheral surface of the drum 3, and a low-speed rotation of the drum 3 that is performed first, that is, one step of stirring washing Is longer than other low-speed rotations, that is, the time of the two steps of stirring and washing and the time of the high-speed rotation process, and effectively removes washing water into the laundry and removes dirt substances in the fibers. In the limited time of the washing process, washing unevenness is small and the washing effect can be enhanced.

  Further, in the step of washing the laundry, the washing water in the receiving cylinder 2 is caused to flow into the water storage unit 18 when the drum 3 rotates at high speed, and the second circulation pump 22 is driven to supply the washing water in the water storage unit 18 to the drum 3. The wash water in which dirt is dissolved is removed from the fiber by centrifugal force generated by the high-speed rotation of the drum 3, and the wash water in the receiving cylinder 2 removed from the laundry is stored in the water storage section. 18 to the laundry in the drum 3 from the discharge part 23, and the washing water can be continuously replaced in the fiber while wetting the laundry, so that the washing effect can be enhanced. The lower part of the drum 3 immersed in the washing water in the inside can be exposed from the surface of the washing water, the resistance of the washing water during high-speed rotation is eliminated, the load on the motor 7 can be reduced, and the drum 3 It can be rotated at a high speed to slip.

(Embodiment 2)
FIG. 4 is a time chart showing the operation of the washing process of the drum type washing machine in the second embodiment of the present invention. The feature of this embodiment is that in the process of washing the laundry, the drain valve 16 is opened before the high speed rotation to drain the wash water into the receiving cylinder 2, and the water supply valve 8 is opened after the high speed rotation to supply new wash water. In addition to supplying water, a predetermined amount of detergent is introduced from the detergent introduction device 10. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

As a result, new clean water is infiltrated into the fiber from which dirt has been removed by centrifugal force due to high-speed rotation, and the cleaning effect is enhanced by accelerating the removal of dirt in the fiber by the chemical action of the activated detergent. be able to.

(Embodiment 3)
FIG. 5 is a plan view of the detergent charging device of the drum type washing machine in the third embodiment of the present invention, and FIG. 6 is a time chart showing the operation of the washing process. A feature of the present embodiment is that the detergent supply device 10 is provided with a plurality of detergent storage portions 10a and 10b, and the first water supply path 10c through which the washing water supplied from the water supply valve 8 flows through the detergent storage portions 10a and 10b. And a switching valve 27 for switching the second water supply passage 10d, and the control means 24 includes a first water supply passage 10c supplied at the beginning of the washing process and a second water supply supplied at the time of water supply after high-speed rotation. The road 10d is switched. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  This optimizes the amount of detergent introduced at the beginning of the washing process, that is, the amount of detergent added in the first water supply process, and the amount of detergent supplied after the high-speed rotation process, that is, the amount of detergent added in the two water supply processes. The cleaning effect can be enhanced by introducing a predetermined amount of detergent at a predetermined timing during the washing process.

  Although this embodiment is a drum type washing machine, it can also be applied to a drum type washing machine having a drying function.

Example 1
Using a drum-type washing machine with a rated capacity of 9 kg as shown in the first embodiment of the present invention, as compared with the conventional method, in the washing process, the time of one stirring and washing process is longer than the time of two stirring and washing processes. Considered the case. A cleaning test was carried out using 9 kg of simulated laundry defined by JEMA (Japan Electrical Manufacturers' Association). Evaluation of cleaning performance was performed by applying 25 JIS standard contaminated cloths sold by the Laundry Science Association to the test garment and measuring the light reflectance before and after washing with the color difference meter ZE-2000 (Nippon Denshoku Industries Co., Ltd.) The degree of cleaning defined in Equation 1 below was calculated, and the cleaning performance was compared.

  The water temperature was 20 ° C., and washing was performed not only in the washing step but also in rinsing and dehydration, and a normal washing step was performed. Both the steps after rinsing were performed with substantially the same amount of water and time, and the washing time was 10 minutes for both the embodiment of the present invention and the conventional method.

  Here, in the washing process in the present invention, the first stirring and washing process is performed for 6 minutes, and the high-speed rotation process is performed twice in succession for 30 seconds for a total of 1 minute, and the water supply 1 process and the water supply 2 process for a total of 1 minute. The latter two steps of stirring and washing were 2 minutes, and the total washing step time was 10 minutes.

In this embodiment, in the high-speed rotation process of rotating the drum 3 at a high speed, the first 30 seconds 1
The rotation speed reached 250 rpm in 30 seconds, which was continued at 40 rpm. Thereafter, the latter two steps of stirring and washing were performed for 2 minutes. As a result of measuring the degree of cleanliness in the JIS standard contaminated cloth, the average value of the degree of cleanliness in the conventional method was 0.32, whereas in the present invention, the average value was 0.38. It was. Further, in the dispersion of the measurement results of the cleanliness, the dispersion in the conventional method was 0.07, and in the present invention, a result almost equal to or greater than 0.06 was obtained. Thus, the result of the outstanding washing | cleaning degree was obtained and it was confirmed that the improvement of the washing performance is achieved by this invention.

  As described above, the drum-type washing machine according to the present invention can remove dirt in the fibers together with the washing water even when the amount of laundry is small in the limited washing process time, and the washing effect Therefore, it is useful as a drum type washing machine.

DESCRIPTION OF SYMBOLS 1 Case 2 Receptacle 3 Drum 7 Motor 8 Water supply valve (water supply means)
11 First circulation channel (circulation channel)
12 First circulation pump (circulation pump)
15 First on-off valve (on-off valve)
16 Drain valve (drainage means)
20 Second open / close valve (open / close valve)
21 Second circulation channel (circulation channel)
22 Second circulation pump (circulation pump)
24 Control means

Claims (3)

A receiving cylinder elastically supported in the housing, a bottomed cylindrical drum rotatably provided in the receiving cylinder, water supply means for supplying washing water into the receiving cylinder, and washing water in the receiving cylinder A drainage means for draining; a motor for rotationally driving the drum; a cloth amount detection means for detecting the amount of laundry put into the drum; and a control means for controlling the drive of the motor. In the step of washing the laundry, the means switches between a low-speed rotation in which the laundry can be tumbled in the drum and a high-speed rotation in which the laundry sticks to the inner peripheral surface of the drum, and is detected by the cloth amount detection means. A drum-type washing machine that is set so that the number of rotations during high-speed rotation is high when the amount of laundry is small. A detergent charging device is provided to put detergent into the receiving cylinder, and the control means drains the washing water into the receiving cylinder before high-speed rotation, supplies new washing water after high-speed rotation, and inputs a predetermined amount of detergent. The drum type washing machine according to claim 1, wherein the drum type washing machine is provided. A plurality of detergent storage units are provided in the detergent charging device, and a switching valve for switching a water supply path through which the washing water flows through each of the detergent storage units is provided, and the control means includes a water supply path that is supplied with water at the beginning of the step of washing the laundry, 3. A drum type washing machine according to claim 2, wherein the water supply path to be supplied at the time of water supply after high speed rotation is switched.

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