JP2012196396A - Drum washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine in which rinsing performance may be improved while reducing time necessary for washing.SOLUTION: A drum washing machine comprises: circulating water passage 31 for discharging rinsing water held in a water tub 2 into a washing tub 3 through an opening 13 of the washing tub 3; a circulation pump 30 for sucking the water held in the water tub 2 and sending it to the circulating water passage 31; water level detecting means 10 for detecting a water level in the water tub 2; and control means 11a for controlling respective steps of a washing operation. The control means 11a stops draining water at a prescribed water level during drainage performed in a rinsing step and drives the circulation pump 30 with the washing tub 3 rotated, so that the suction by the circulation pump 30 and dewatering through the rotation of the washing tub 3 may be alternately repeated for moving a detergent included in laundry to circulating water poured from the circulating water passage 31. Thus, performance for removing a detergent from laundry, namely, rinsing performance, may be improved.

Description

  The present invention relates to a drum-type washing machine that puts laundry into a rotating drum and performs washing by sequentially controlling each process such as washing, rinsing, and dehydration.

  The conventional washing machine stops the rotation of the washing tub and finishes draining the washing water from the water receiving tub when dehydrating, such as when shifting from the washing process to the rinsing process and when shifting from the rinsing process to the dehydrating process. Then, it moves to the next process such as a rinsing process or a dehydration process and dehydrates. However, if the dehydration operation is performed after stopping the rotation of the washing tub and waiting for the end of drainage, the operation time becomes longer.Therefore, by rotating the washing tub early during drainage, the start-up of the dehydration process is accelerated and the washing time is increased. (For example, refer to Patent Document 1).

  In Patent Document 1, stirring in the washing process is started, and when the stirring operation for a predetermined time is finished, the drainage operation is started. Turn off the drum drive motor, turn on the drain valve, and drain. Based on an input signal from the state detection circuit, it is detected whether various states have reached the drum driving conditions. The driving condition is that the water level in the water receiving tank drops to a predetermined water level, or that a predetermined time elapses from the start of drainage. In addition, the drum is stopped by the detection of the driving condition at the latest. When it is detected that the drive condition has been reached, the drum drive motor is turned on so that the stopped drum rotates at a low speed in the reverse direction, and the dehydration process is started early.

JP 2004-16399 A

  However, in the above-described conventional configuration, when the washing tub reaches the driving condition from the start of drainage, the drum starts rotating, so that the washing time can be shortened, but the rinsing performance is insufficient.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a washing machine capable of improving the rinsing performance while shortening the washing time.

  In order to solve the above-described problems, a washing machine of the present invention includes a washing tub, a water receiving tub that rotatably stores the washing tub, a driving unit that rotationally drives the washing tub, and water in the water receiving tub. Draining means for draining water, a circulating water channel for discharging the rinse water accumulated in the water receiving tub from the front opening of the washing tub into the washing tub, and sucking water in the water receiving tub into the circulating water channel A circulation pump for feeding water, a water level detection means for detecting the water level in the water receiving tank, and an output from the water level detection means are inputted, and the drive means, the circulation pump, and the drainage means are controlled and washed. And a control means for controlling each of the process, the rinsing process, and the dehydration process. The rinsing process includes at least a first rinsing process and a second rinsing process, and the control means includes the second rinsing process. In the process or the dehydration process Before the dehydrating operation, a balance control operation for suppressing the vibration of the washing tub due to the dehydrating operation is performed, and in the drainage of the rinse water after the second rinsing, the water level has reached a predetermined water level. When the water level detecting means detects, the drainage is stopped and the circulation pump is driven during the balance control operation so that the rinse water remaining in the water receiving tub is applied to the laundry.

  According to the above configuration, water absorption by the circulation pump and dehydration by rotation of the washing tub are repeated, and the detergent in the laundry moves to the circulating water from the circulation water channel. Thereby, the removal performance of the detergent from the laundry, that is, the rinsing performance can be improved. Furthermore, since the circulated water from the circulation channel uses rinse water, it is not necessary to supply new water for the circulated water separately, so that water saving and water supply time can be reduced, that is, washing time can be reduced.

  In the drum type washing machine of the present invention, the rinsing water is applied to the laundry while rotating the washing tub before dehydration, so that the rinsing performance can be improved.

Sectional drawing which shows schematic structure of the drum type washing machine in Embodiment 1 of this invention The block diagram which shows the structure of the control unit of the drum type washing machine Time chart showing the operation of the first rinsing process of the drum type washing machine Time chart showing the operation of the second rinsing process of the drum type washing machine Time chart showing the operation of the dehydration process of the drum type washing machine

  The first invention includes a washing tub, a water receiving tub for rotatably storing the washing tub, a driving means for rotationally driving the washing tub, a draining means for draining water in the water receiving tub, A circulating water channel for discharging the rinse water collected in the water receiving tub into the washing tub from the front opening of the washing tub, and a circulation pump for sucking the water in the water receiving tub and feeding it to the circulating water channel; The water level detection means for detecting the water level in the water receiving tank, and the output from the water level detection means are inputted, the drive means, the circulation pump, and the drainage means are controlled, and the washing process, the rinsing process, and the dehydration process are performed. Control means for controlling each process, and the rinsing process includes at least a first rinsing process and a second rinsing process, and the control means performs a dehydrating operation in the second rinsing process or the dehydrating process. Before the dehydration When the water level detecting means detects that the water level has reached a predetermined level in the drainage of the rinse water after the completion of the second rinse, the balance control operation is performed to suppress the vibration of the washing tub due to the operation. And the circulation pump is driven during the balance control operation so that the rinse water remaining in the water receiving tub is poured onto the laundry.

  The amount of water absorbed by the laundry can be increased by applying the drainage of the second rinse stored in the water receiving tank to the laundry with a circulation pump during the final dehydration or intermediate dehydration balance control in the third rinse. By performing dehydration by rotation of the washing tub during balance control of intermediate dehydration, the laundry is repeatedly absorbed and dehydrated. That is, the detergent in the laundry moves to the water poured by the discharge of the rinsing water and is discharged into the drainage of the second rinsing, thereby promoting the replacement of the rinsing water with respect to the laundry. Thereby, the removal performance of the surfactant which is the main component of the detergent from the laundry can be improved.

  Furthermore, since the discharged rinse water uses the drainage of the second rinse, the remaining amount of the detergent in the rinse water is small, so that it is very close to tap water. By using the rinsing water in the water receiving tank for the discharged water, it is not necessary to supply water to the water receiving tank, so that water saving and water supply time can be reduced, that is, washing time can be reduced. Moreover, since the water which is quite close to tap water is used, the effect of improving the alkali removal performance of the detergent having the property of being more soluble in water than the surfactant can be obtained.

According to a second aspect of the present invention, the drum-type washing machine of the first aspect of the present invention includes a rotational speed detection means for detecting the rotational speed of the washing tub, and the control means is discharged from the circulation channel in the balance control operation. When the rotational speed detection means detects that the rotational speed of the washing tub has reached a predetermined rotational speed lower than the rotational speed at which the washing tank stalls due to the rinse water, the driving of the circulation pump is stopped. Thereby, it is possible to stably shift from the balance control to the intermediate dehydration of the second rinse without stalling the rotation speed of the washing tub due to the influence of the discharge of the rinse water. For this reason, the extension of the dehydration time due to the failure of balance control can be suppressed.

  According to a third aspect of the present invention, the drum-type washing machine according to the second aspect of the present invention includes cloth amount detecting means for detecting the amount of the laundry, and the control means is configured to determine the predetermined amount based on the cloth amount detected by the cloth amount detecting means. The number of rotations is determined. As a result, the predetermined rotation speed for stopping the circulation pump during balance control can be determined by the amount of laundry, so that balance control can be performed more reliably. Can be suppressed.

  According to a fourth aspect of the present invention, the control means according to any one of the first to third aspects stops the circulation pump before the water level drops by starting drainage after the circulation pump is stopped in the balance control operation. Therefore, it is possible to prevent noise caused by air leakage from the circulation pump. In addition, by draining the water accumulated in the water receiving tank when it becomes unnecessary after the circulation pump is stopped, the influence of the water accumulated in the water receiving tank is eliminated against the increase in the rotation speed of the washing tank, It is possible to shift from balance control to intermediate dehydration stably.

  According to a fifth aspect of the present invention, since the control means according to any one of the first to third aspects of the present invention controls the balance control operation to start draining before the circulation pump is stopped, draining ends quickly. Since it is possible to suppress a delay in the increase in the number of rotations of the washing tub due to the influence of water remaining in the receiving tub, the intermediate dehydration time can be shortened.

  According to a sixth aspect of the present invention, the control means according to any one of the second to fifth aspects of the present invention is configured to increase the number of rotations of the washing tub to the number of rotations of the dehydration operation after the balance control operation, thereby stably washing The number of rotations of the tank can be increased.

  According to a seventh aspect of the present invention, since the rotation axis of the washing tub according to any one of the first to sixth aspects is inclined so as to face downward from the front side toward the back side, the laundry can be made with less rinsing water. Can be improved, and the rinsing performance can be improved.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic structure of a drum type washing machine according to an embodiment of the present invention. The configuration will be described below with reference to FIG.

  A water receiving tub 2 is housed inside the washing machine body 1 so as to be swingable. A rotating drum 3 serving as a washing tub is disposed in the water receiving tub 2 so as to be rotatable about a horizontal rotation shaft 3a. ing. A rotating shaft 3 a of the rotating drum 3 is directly connected to a motor 4 attached to the outside of the back surface of the water receiving tank 2, and the water receiving tank 2 is rotationally driven by the motor 4.

The rotating drum 3 is provided with a plurality of through holes 3e over the entire peripheral wall 3c so that water can be passed and vented between the water receiving tank 2 and the rotating drum 3. A plurality of agitation protrusions 3 b are provided on the inner surface of the peripheral wall 3 c of the rotating drum 3 so that the laundry in the rotating drum 3 is lifted by the rotation of the rotating drum 3. Although the through hole 3e is provided over the entire peripheral wall of the rotary drum 3, it may be partially formed on the peripheral wall of the rotary drum 3. In short, the air permeability between the water receiving tank 2 and the rotary drum 3 is important. In addition, it should be set so that water permeability can be ensured and washing does not hinder drying.

  Further, the rotation shaft 3a of the rotary drum 3 is inclined so as to face downward from the front side toward the rear side, and specifically, is arranged to be inclined downward, for example, by an angle θ = 20 ± 15 degrees from the horizontal direction X. Has been. By tilting the rotary shaft 3a in this way, the opening 13 of the water receiving tank 2 can be disposed on the upper side, and the rotating drum can be inserted through the opening 13 of the water receiving tank 2 without taking a posture of bending greatly. The laundry in 3 can be taken out.

  Compared with the case where the rotating shaft 3a is set in the horizontal direction, the water supplied into the water receiving tank 2 accumulates on the back side, and a deep water storage state can be obtained even with a small amount of water. That is, the contact with the laundry can be improved with less rinsing water, and the rinsing performance can be improved.

  In order to efficiently supply water to the laundry in the rotating drum 3, the water receiving tub 2 is provided along the vicinity thereof with the same inclination as the rotating drum 3. By tilting the rotating drum 3 and the water receiving tub 2, it is possible to improve the contact with the laundry with less rinsing water than when the rotating drum 3 and the water receiving tub 2 are horizontally arranged. If the amount of water supply is not taken into consideration, the rotary drum 3 may be horizontal or the inclination angle θ may be less than 15 degrees.

  The water supply part 7 arrange | positioned at the upper part of the water receiving tank 2 has the water supply valve 7a which is a water supply means, the detergent accommodating part 7b, and the water supply path | route 7c. The water that has passed through the water supply valve 7a is supplied to the space Y formed between the inner surface of the water receiving tank 2 and the outer surface of the rotating drum 3 together with the detergent in the detergent container 7b.

  The water supply does not necessarily have to be in the space Y. In short, it is sufficient that water can be supplied into the water receiving tank 2 and the rotating drum 3, so even if water is supplied directly into the rotating drum 3 from the opening 13 of the water receiving tank 2. Alternatively, water may be supplied to a space formed between the peripheral wall 2c of the water receiving tank 2 and the peripheral wall 3c of the rotating drum 3.

  The drainage section 8 has a drain pipe 8a having one end connected to the bottom of the water receiving tank 2 and a drain valve 8b that is a drain means. When the drain valve 8b is opened and closed, the washing process is completed and the rinse process is completed. When necessary, the water in the water receiving tank 2 can be drained through the drain pipe 8a. Further, a drainage filter 8c that can be removed from the outside of the washing machine main body 1 is disposed on the downstream side of the drainage pipe 8a to collect lint contained in the drainage.

  In addition to the above, the water in the water receiving tank 2 is circulated by the circulation pump 30 as necessary during the washing preparation process, the washing process, the rinsing process, etc. to prevent early dissolution and bias of the detergent, and the washing is easy. It also has a function to improve the function.

  As shown in FIG. 1, the circulation pump 30 is fixed on a base plate 1 a that is the bottom of the washing machine body 1, sucks washing water and rinsing water, and sends the washing water to the circulation water channel 31. In addition, the wash water sent through the circulating water channel 31 discharges the wash water accumulated in the water receiving tub 2 into the rotary drum 3 from the opening 14 of the rotary drum 3. Specifically, the discharge-side channel 31a of the circulation channel 31 is connected from the outer surface to the discharge port 35 provided in the front end wall 2h around the opening 13 of the water receiving tank 2, and the back surface of the front end wall 2h of the water receiving tank 2 Rinsing water is discharged between the surface of the front end wall 3h of the rotating drum 3 corresponding thereto and discharged into the rotating drum 3 through a flow path formed therebetween. Thereby, since the discharge port 35 of the water from the discharge side path 31a is in a position where it does not come into contact with the laundry in the rotary drum 3, the laundry is caught and disturbs the behavior necessary for washing, rinsing, drying, etc. It is possible to prevent the laundry from being damaged or torn, and the appearance is not impaired.

The attachment position of the discharge port 35 is not limited to the lower part.
Any arrangement is possible as long as it does not contact the laundry inside. Further, the number of discharge side paths 31a is not limited to one, and a plurality of discharge paths 31a may be provided, and the discharge ports 35 may be provided not only from the lower part but also from the upper part.

  Further, when the washing water is simply sprayed into the rotating drum 3, the circulating water can be sprayed only to the local portion of the laundry in the rotating drum 3, and the circulation effect cannot be fully utilized. On the other hand, if a special injection nozzle is used to inject the circulating water over a wide area, the required pump pressure will increase and there will be a cost increase. Therefore, in the first embodiment of the present invention, the flow rate of the circulating water discharged using, for example, a DC brushless motor capable of controlling the rotational speed in order to circulate the water in the water receiving tank 2 by the circulation pump 30. By adjusting the flow velocity, it is possible to change the vertical angle and the extent of the horizontal direction of the circulating water to be discharged without adopting a special injection nozzle. As a result, the circulating pump 30 can supply the circulating water evenly and optimally to the laundry in the water receiving tub 2, and the washing performance and the rinsing performance can be improved. Also, depending on the water level, air may circulate in the circulation pump 30, but air stagnation can be prevented by controlling the rotation speed of the circulation pump. Moreover, since it is possible to avoid unnecessary supply of circulating water to the space where the laundry is not located, it is possible to suppress useless power consumption and to suppress abnormal foaming due to the detergent water.

  In addition, in this Embodiment 1, although it was set as the structure which installs the circulation pump 30 on the baseplate 1a which is the bottom part of the washing machine main body 1, it is not limited to this, The water in the water receiving tank 2 is used. In order to circulate, the structure which installs the circulation pump 30 in the lower part of the water receiving tank 2 may be sufficient.

  Next, details of the control unit 11 will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the control unit 11 of the drum type washing machine in Embodiment 1 of the present invention. The control unit 11 has a control means 11a composed of a microcomputer, and controls operations of the motor 4, the water supply valve 7a, the drain valve 8b, the circulation pump 30, and the like via the power switching means 11d.

  The storage unit 11c stores data necessary for control by the control unit 11a. The control means 11a displays the display means 17 on the basis of information such as the set water level and time to inform the user.

  Further, the control means 11a determines the washing water level based on the cloth amount from the cloth amount detection means 11b, and sends a signal to the water supply valve 7a to supply water. When the water level in the water receiving tank 2 is determined by the water level detection means 10, the control means 11a sends a signal to close the water supply valve 7a and stops water supply.

  Similarly, the control means 11a sends a signal to the drain valve 8b to start draining, and when the water level detecting means 10 detects that the water level has reached a predetermined level, it sends a signal to the drain valve 8b to stop draining. Similarly, the control means 11a sends a signal to the motor 4, receives a signal from the rotation speed detection means 20, and controls the rotation speed of the rotary drum 3 so as to be a predetermined rotation speed.

  The drum type washing machine in Embodiment 1 of the present invention automatically controls the motor 4, the water supply valve 7a, the drain valve 8b, and the drying means (not shown) according to the mode setting and control program, and the washing process, the rinsing process, It has a function of performing a dehydration process and a drying process. However, in the present invention, since the presence or absence of the drying function is not relevant, the drying step can be omitted.

  Further, the drum type washing machine according to the first embodiment of the present invention is provided with a cloth amount detecting means for detecting the amount of the laundry put into the rotating drum 3. Hereinafter, an example of the cloth amount detection means will be described.

  The cloth amount detection is performed as follows. First, the motor 4 is rotationally driven. The rotational speed of the rotating drum 3 at this time is once raised to a rotational speed at which the laundry is stuck to the inside of the peripheral wall 3c of the rotating drum 3, for example, about 100 to 140 r / min. After maintaining the rotation for a predetermined time, the motor is turned off. Thereby, the inertial rotation of the rotating drum 3 is in a state of rotating the motor 4 in reverse. At this time, the inertial rotational force of the rotating drum 3 gradually decreases due to the friction torque, and the rotating drum 3 stops eventually. The time from the stop of energization to the stop of the rotating drum 3 is long when the amount of laundry is large and short when the amount of laundry is small. The amount of laundry is detected using the fact that the difference in time required for this stop is proportional to the amount of laundry.

  The water level detection means 10 can detect the amount of water supplied into the water receiving tank 2 by detecting the water level of the water receiving tank 2. The water level detection means 10 is formed by connecting an air trap portion 10a and a pressure detection portion (not shown) disposed at a predetermined position near the lowest portion of the rotary drum 3 with a hose 10b.

  The output of the water level detection means 10 changes depending on the rotation speed of the rotary drum 3 because the output changes depending on the rotation of the rotary drum 3 during the washing operation, such as whether or not the rotary drum 3 is rotating and its rotation speed. Have multiple tables. That is, the water level can be recognized while the rotating drum 3 is stationary or rotating.

  In addition, the drum type washing machine according to the present embodiment includes a system that can manage all input / output control with a timer, including not only instructions for water supply / drainage and driving of the rotating drum 3, but also various sensor outputs such as the water level detection means 10. Therefore, it is possible to know the time required for each operation and timing.

  About the drum type washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated using FIGS. 3-5 below.

  In a normal washing operation, the laundry is first put into the rotary drum 3 from the open / close door 5, and the cloth amount is detected as the rotary drum 3 rotates while the laundry is not wet. At this time, the cloth amount detected by the cloth amount detecting means 11b is used to determine a predetermined number of rotations for stopping the circulation pump 30 in the balance control operation for suppressing the vibration of the rotary drum 3 before intermediate dehydration or dehydration.

  Thereafter, the water supply valve 7a is opened to start water supply, and the detergent in the detergent container 7b is also poured into the water receiving tank 2.

  Further, the control means 11 a controls the motor 4 and causes the rotating drum 3 to be agitated by the motor 4. As a result, the laundry in the rotating drum 3 is caught by the stirring protrusion 3b, and the laundry is lifted and dropped on the water surface where the detergent is dissolved, so that the laundry is washed by the penetration and discharge of the detergent into the laundry. Remove dirt. When the washing process is completed, the control means 11a operates the drain valve 8b to drain the washing water in the water receiving tank 2.

  Thereafter, the first rinsing step is performed in which intermediate dehydration, feed water stirring, and stirring are performed. FIG. 3 is a time chart showing the operation of the first rinsing step of the drum type washing machine in the first embodiment of the present invention.

  The control means 11a sends a signal to the motor 4 to start a balance control operation for the laundry in the rotating drum 3 necessary for performing intermediate dehydration. This balance control operation is performed using a vibration detection sensor (not shown) or the like in order to reduce vibration when the rotating drum 3 is rotated at high speed.

  The control means 11a sends a signal to the motor 4 and tumbles the rotating drum 3 clockwise and counterclockwise several times alternately to unwind the laundry accumulated under the rotating drum 3, and then rotates the rotating drum 3. The number of rotations is gradually increased so as to stick to the inner surface of the peripheral wall 3c of the rotating drum 3 so that an unbalance does not occur, for example, aiming at a number of 120 r / min. When the rotational speed of the rotating drum 3 reaches 120 r / min, it rotates for a predetermined time.

  After a predetermined time has elapsed, the control unit 11a controls the motor 4 by gradually increasing the number of revolutions of the motor 4 to increase the number of revolutions of the rotating drum 3. When the control means 11a increases the rotation speed of the rotary drum 3 to about 370 r / min and confirms that it rotates stably for a predetermined time, the control means 11a shifts to intermediate dehydration in earnest. Increase the speed to the maximum speed set in the intermediate dehydration. The maximum rotation speed at this time is, for example, 900 r / min. When the time t1 elapses, the rotational speed is lowered by the brake and the rotary drum 3 is stopped.

  After completion of the intermediate dehydration, the laundry is stuck to the rotating drum 3. First, the control means 11a opens the water supply valve 7a and accumulates rinsing water in the water receiving tank 2 while rotating the rotary drum 3 in a certain direction via the power switching means 11d. At this time, the rotational speed of the rotating drum 3 is, for example, 80 r / min. With this rotational speed, the laundry stuck to the rotating drum 3 remains substantially stuck.

  When the rinse water accumulates in the water receiving tank 2 and the water level detection means 10 detects the water level N1, the control means 11a stops the water supply and drives the circulation pump 30 to apply the circulating water to the laundry and rotate the rotating drum 3. The number is increased from 80 r / min to, for example, 170 r / min. The control means 11a measures the time when the rotational speed of the rotary drum 3 is from 80 r / min to 170 r / min, and when the time reaches T, the rotational speed of the rotary drum 3 is decreased and water supply is resumed. At this time, the rotating drum 3 performs tumbling, and the laundry stuck to the rotating drum 3 is peeled off from the rotating drum 3 and the laundry in the rinse water collected in the water receiving tub 2 is stirred and rinsed. .

  When the water level detection means 10 detects the water level N2, the control means 11a stops water supply and starts measuring the stirring time after completion of the predetermined water supply of the rotary drum 3. When the time t2 elapses, the control unit 11a stops the operation of the rotary drum 3 and also stops the circulation pump 30, and the first rinsing process is completed.

  When the first rinsing process is completed and the second rinsing process is entered, the control means 11a sends a signal to the drain valve 8b to start draining the rinse water accumulated in the water receiving tank 2. The control means 11a sends a signal to the motor 4 to start a balance control operation for the laundry in the rotating drum 3 necessary for performing dehydration. For example, aiming at a rotational speed of 120 r / min, the rotational speed is gradually increased so that unbalance does not occur. When it is confirmed that the rotating drum 3 rotates stably for a predetermined time at a rotation speed of 120 r / min, the control means 11a gradually increases the rotation speed of the motor 4 to about 370 r / min. At this time, when the control means 11a confirms that the rotating drum 3 rotates stably for a predetermined time at a rotational speed of 370 r / min, the control means 11a shifts to intermediate dehydration in earnest. In the intermediate dehydration, the rotational speed of the rotary drum 3 is increased to the set maximum rotational speed. The maximum rotation speed at this time is, for example, 900 r / min. When the time t3 has elapsed, the control means 11a stops the rotating drum 3. When the rotating drum 3 is stopped, the second intermediate dehydration process is finished, and the process proceeds to the feed water stirring process.

At this time, the laundry is stuck to the rotating drum 3. The control means 11 a opens the water supply valve 7 a and accumulates rinsing water in the water receiving tank 2. Further, the rotating drum 3 is agitated through the power switching means 11 d, and the laundry stuck to the rotating drum 3 is peeled off from the rotating drum 3. By doing in this way, the laundry in the rinse water collected in the water receiving tank 2 is stirred and rinsed. When the rinsing water accumulates in the water receiving tank 2 and the water level detection means 10 detects the water level N3, the control means 11a sends a signal to the circulation pump 30, and the rinsing water passing through the circulation water channel 31 is discharged from the discharge port 35 to circulate. Start rinsing the laundry with a shower. Moreover, when the water level detection means 10 detects the water level N4, the control means 11a stops water supply. The measurement of the stirring time after completion of the predetermined water supply of the rotary drum 3 is started. When the stirring time elapses at time t4, the control unit 11a stops the operation of the rotary drum 3, stops the circulation pump 30, and ends the second rinsing step.

  When the number of times of rinsing is set to 2, when the second rinsing process is completed, the first rinsing process for draining and dewatering is started. The control means 11a sends a signal to the drain valve 8b and starts draining the rinse water accumulated in the water receiving tank 2. A signal is sent to the motor 4 to start a laundry balance control operation necessary to increase the rotational speed. Further, when the control means 11a confirms that the water level has reached the predetermined water level N5, the control means 11a sends a signal to the drain valve 8b to stop draining. Thereafter, the control means 11a sends a signal to the motor 4 and tumbles the rotating drum 3 clockwise and counterclockwise alternately several times to loosen the laundry stored under the rotating drum 3. Thereafter, the rotational speed is gradually increased, for example, aiming at 120 r / min.

  Moreover, the control means 11a drives the circulation pump 30 in the middle of cloth unraveling the laundry. Thereby, the rinse water which passed through the circulation water channel 31 is discharged from the discharge outlet 35, and it begins to pour rinse water on the laundry. Since the rinsing water at this time is the second rinsing water, the remaining amount of the detergent is small and it is quite close to tap water. For this reason, it is not necessary to bother to supply water to the water receiving tank 2, and water saving and water supply time can be reduced, that is, the washing time can be reduced. Moreover, since the water which is quite close to a tap water is utilized, the alkali removal performance of the detergent which has a characteristic which is more easily dissolved in water than a surfactant can be improved.

  When the rotational speed of the rotating drum reaches 120 r / min, the rotation is maintained at a predetermined time of 120 r / min, and the balance of the laundry is checked. In the balance control operation, the control means 11a indicates that the rotational speed detection means 20 has detected that the rotational speed of the rotary drum 3 has reached a predetermined rotational speed that is lower than the rotational speed at which the rotational drum 3 stalls due to the rinsing water discharged from the circulation water channel 31. When detected, the circulation pump 30 is stopped.

  Specifically, the control means 11a sets a predetermined rotational speed lower than the rotational speed at which the rotational speed of the rotating drum 3 is stalled due to the influence of the shower due to the discharge of rinse water before the rotational speed of the rotating drum 3 is increased again. Calculate it. The stalling speed varies depending on the strength of the discharged water and the amount of laundry. Therefore, the control means 11a determines a predetermined number of rotations from the cloth amount detected by the cloth amount detection means 11b. The calculation of the predetermined rotation speed lower than the stall may be performed when the cloth amount is detected or during balance control during rinsing. In short, any time before increasing the number of rotations of the rotating drum 3 while applying discharged water may be used. In the first embodiment of the present invention, the predetermined rotational speed lower than the stalling rotational speed is, for example, 150 r / min.

  When the rotational speed of the rotary drum 3 exceeds 150 r / min, the control means 11 a sends a signal to the circulation pump 30 and stops the operation of the circulation pump 30. The control means 11a also sends a signal to the drain valve 8b to drain the water.

At this time, the amount of water absorbed by the laundry increases as the second rinse water remaining in the water receiving tub 2 is applied to the laundry. Further, during the balance control of the intermediate dehydration, the rotary drum 3 is rotated at 120 r / min. For this reason, when the dehydration is performed by the rotation of the rotary drum 3, the laundry is repeatedly absorbed and dehydrated. That is, the detergent in the laundry moves to the discharged water and is immediately discharged because it is dehydrated by rotation. For this reason, replacement of rinse water for the laundry is promoted.

  In the first embodiment of the present invention, the circulation pump 30 is stopped at the same time as the rotation number of the rotary drum 3 reaches a predetermined rotation number. However, the drainage may be started after the circulation pump 30 is stopped. By doing in this way, the noise by the air trap of the circulation pump 30 can be prevented.

  Further, drainage may be started before the circulation pump 30 is stopped. Thereby, the rotation speed of the rotating drum 3 can be increased stably.

  The balance control operation is continued thereafter, and the control means 11a gradually increases the rotational speed of the motor 4 to 370 r / min. When drainage is finished and it is confirmed that it rotates stably for a predetermined time, it shifts to full-scale dehydration. The rotational speed of the rotating drum 3 is increased to the maximum rotational speed set by dehydration. The maximum rotational speed is, for example, 900 r / min. When the rotation at the maximum number of rotations has elapsed time t5, the number of rotations of the rotating drum 3 is reduced by the brake and stopped. As described above, the dehydration step is completed. When the dehydration process is finished, the washing is finished, and the control means 11a turns off the power of the washing machine body 1.

  In Embodiment 1 of the present invention, rinsing is performed twice, but there may be a third rinse. In short, it is only necessary that the rinse water can be discharged from the circulation channel during the balance control using the second rinse water or the third rinse water in which the detergent component is reduced. That is, in the final dehydration or the intermediate dehydration in the third rinsing, the rinse drainage collected in the water receiving tub 2 during balance control is applied to the laundry by the circulation pump 30. As a result, the amount of water absorbed by the laundry is increased, and dewatering is performed by rotating the rotary drum 3 during balance control of dewatering. As a result, the laundry is repeatedly absorbed and dehydrated. In other words, the detergent in the laundry moves to the applied water and is discharged into the drainage of the second or third rinse, which promotes the replacement of the rinse water with respect to the laundry. Thereby, the surfactant which is the main component of the detergent from the laundry can be removed, and the rinsing performance can be improved.

  Furthermore, the rinse water discharged uses drainage of the second or third rinse. For this reason, the remaining amount of the detergent in the discharged water is small, which is very close to tap water. Since the second or third rinse water is used as the discharge water, it is not necessary to supply water to the water receiving tank 2 anew. For this reason, water saving and water supply time can be reduced, that is, the washing time can be shortened. Moreover, since the water which is quite close to tap water is utilized, the alkali removal performance of the detergent which has a characteristic which is more easily dissolved in water than a surfactant is improved.

  In addition, when the number of rotations of the rotating drum 3 is increased while discharging rinsing water to the normal laundry, the resistance of the water accumulated in the water receiving tank 2 necessary for the discharged water, the detergent dissolved in the water If the rotating drum 3 is increased to a certain number of rotations due to bubbles or detergent bubbles remaining in the laundry, the force for rotating the rotating drum 3 increases. For this reason, the power of the motor 4 for rotating the rotary drum 3 is insufficient, and the vehicle stalls. The rotational speed at which the vehicle stalls varies depending on the amount of laundry. Therefore, the stalling rotational speed with respect to the laundry amount is determined. Based on this, the control unit 11 grasps as the data a rotational speed lower than the stalling rotational speed. By controlling the stop of the circulation pump 30 and the start of drainage according to the rotational speed, even when rotating while discharging rinse water, it functions well as intermediate dewatering without stalling the rotational speed of the rotating drum 3 it can.

  Further, the control means 11a increases the rotational speed of the rotary drum 3 to the rotational speed as dehydration after confirming the balance by rotating the rotary drum 3 for a predetermined time, for example, at 370 r / min after the end of drainage. The rotation speed can be increased.

  In the present invention, the rotational speed of the circulation pump 30 and the rotational speed of the rotary drum 3 are not particularly specified. Further, the ON / OFF of the circulation pump is not particularly defined except for the final dehydration or the balance control in the third rinsing process. Moreover, you may implement both the methods of implementing the rinse similar to this invention at the time of balance control of the 2nd rinse.

  With the configuration as described above, the present invention effectively uses the time during drainage and drainage, so that it is possible to improve the rinsing performance while saving water and washing time.

  Since the washing machine according to the present invention improves the rinsing performance using circulating water, it can be applied not only to a household washing machine but also to a washing apparatus for textiles and a commercial washing machine mainly composed of water washing.

DESCRIPTION OF SYMBOLS 1 Washing machine main body 1a Base plate 2 Water receiving tank 2c Perimeter wall 2h Front end wall 3 Rotating drum (washing tub)
3a Rotating shaft 3b Stirring protrusion 3c Peripheral wall 3e Through hole 3h Front end wall 4 Motor 5 Opening / closing door 7 Water supply part 7a Water supply valve (water supply means)
7b Detergent storage part 7c Water supply path 8 Drainage part 8a Drain pipe 8b Drain valve (drainage means)
8c Drain filter 10 Water level detection means 10a Air trap part 10b Hose 11 Control unit 11a Control means 11b Cloth amount detection means 11c Storage means 11d Power switching means 13 Opening of water receiving tank 14 Opening of rotating drum 17 Display means 20 Rotation speed detection means 30 Circulating pump 31 Circulating water channel 31a Discharge side channel 35 Discharge port

Claims (7)

A washing tub,
A water receiving tub for rotatably storing the washing tub;
Drive means for rotationally driving the washing tub;
Drainage means for draining water in the water receiving tank;
A circulation channel for discharging the rinse water collected in the water receiving tub into the washing tub from a front opening of the washing tub;
A circulation pump for sucking the water in the water receiving tank and feeding it to the circulation channel;
Water level detection means for detecting the water level in the water receiving tank;
Inputting an output from the water level detection means, and controlling the drive means, the circulation pump, the drainage means, and a control means for controlling each of the washing process, the rinsing process, and the dehydration process,
The rinsing step has at least a first rinsing step and a second rinsing step,
The control means performs a balance control operation for suppressing vibration of the washing tub due to the dehydrating operation before the dehydrating operation in the second rinsing step or the dehydrating step, and the control unit after the second rinsing is completed. When the water level detecting means detects that the water level has reached a predetermined level in the rinse water drainage, the drainage is stopped, and during the balance control operation, the circulation pump is driven to leave the rinse water remaining in the water receiving tank. A drum-type washing machine that puts the product on the laundry. Comprising a rotational speed detection means for detecting the rotational speed of the washing tub;
In the balance control operation, the controller detects that the rotational speed detection means has reached a predetermined rotational speed lower than the rotational speed at which the rotational speed of the washing tub is stalled by the rinse water discharged from the circulation water channel. The drum-type washing machine according to claim 1, wherein upon detection, the driving of the circulation pump is stopped. A cloth amount detecting means for detecting the amount of the laundry,
The drum type washing machine according to claim 2, wherein the control means determines the predetermined number of rotations from the cloth amount detected by the cloth amount detection means. The drum type washing machine according to any one of claims 1 to 3, wherein the control means starts drainage after the circulation pump is stopped in the balance control operation. The drum type washing machine according to any one of claims 1 to 3, wherein the control means starts drainage before the circulation pump is stopped in the balance control operation. The drum type washing machine according to any one of claims 1 to 5, wherein the control means increases the number of rotations of the washing tub after the balance control operation to the number of rotations of the dehydration operation. The drum type washing machine according to any one of claims 1 to 6, wherein a rotation axis of the washing tub is inclined so as to face downward from the front side toward the back side.