JP2014094074A - Twin tub washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a twin tub washing machine capable of shortening washing time and also capable of improving convenience and reliability.SOLUTION: A twin tub washing machine of this embodiment, which includes a washing tub and a dewatering tub, includes: a washing motor for rotating an agitator provided inside the washing tub; a dewatering motor for rotating a dewatering basket provided inside the dewatering tub; and control means for controlling a washing operation by driving of the washing motor and the dewatering motor. The control means controls the washing operation so as not to exceed the preset overall threshold value with regard to a control condition for executing the washing operation on the washing tub side and on the dewatering tub side.

Description

  The present embodiment relates to a two-tub washing machine.

  In the two-tub washing machine, a washing tub for performing washing and a dewatering tub for performing dewatering are arranged side by side. For this reason, the washing tub of the two-tank type washing machine is smaller than the washing tub of a so-called fully automatic washing machine or a drum type washing machine, and the capacity that can accommodate the laundry is limited accordingly. That is, in the two-tub washing machine, the diameter of the washing tub and the diameter of the dewatering basket disposed inside the dewatering tub are smaller than those of a washing machine configured to use both the washing tub and the dewatering basket. Because of the capacity of the laundry, the user is likely to do so-called separate washing such as white and color, and the size of dirt, so it is often the case that washing is done in two steps. .

JP 2003-175296 A

By the way, in the two-tank type washing machine, it is necessary for the user to move the laundry from the washing tub to the dehydration tub (dehydration basket) or return the dehydration tub to the washing tub. Therefore, when washing in multiple times as described above, not only will washing time be prolonged, but it will be too easy to wash and the laundry must be transferred between the washing tub and dehydration tub each time dehydration is completed. It was a troublesome thing.
Therefore, a two-tub washing machine that can shorten the washing time and can improve convenience and reliability is provided.

  The two-tub washing machine of this embodiment includes a washing tub and a dehydrating tub, a washing motor that rotates a stirring body provided in the washing tub, and a dehydration provided in the dehydrating tub. A dehydrating motor that rotates a basket, and a control unit that controls the washing motor and a washing operation by driving the dehydrating motor, and the control unit executes the washing operation on the washing tub side and the dehydration tub side. The washing operation is controlled so as not to exceed an overall threshold set in advance with respect to the control conditions for

The figure for demonstrating the relationship between each electric current of a washing motor and a dehydration motor, and the threshold value regarding a total electric current value. It is a schematic diagram of a two-tub type washing machine, (a) and (b) is a longitudinal front view showing the overall configuration and the configuration relating to the drainage of the lower part Diagram showing electrical configuration schematically Diagram showing the waveform of each part (A), (b) and (c) show the relationship between the amount of drainage per unit time from the washing tub, the amount of drainage per unit time from the dehydration tub, and the total amount of water summed up, and the threshold for the amount of water. Illustration to explain It is a figure for demonstrating the procedure in the case of washing in two steps, (a) is the procedure when carrying out the washing of the remaining laundry after finishing the washing of one laundry, (b ) Is a diagram showing a procedure when washing or rinsing and dehydration are performed in parallel.

Hereinafter, the present embodiment will be described with reference to FIGS.
As shown in FIG. 2A, the two-tub washing machine has a configuration in which a left-side washing tub 2 and a right-side dewatering tub 3 in the outer box 1 are arranged side by side. A pulsator 4 for generating a water flow by stirring the water stored in the washing tub 2 is disposed at the inner bottom of the washing tub 2. The pulsator 4 is a stirring body having a plurality of stirring protrusions 4 b on the upper surface, and the drive shaft 4 a extends downward through the inner bottom of the washing tub 2. Inside the dewatering tub 3, a dewatering basket 5 for storing and dewatering laundry (not shown) as a material to be dewatered is rotatably disposed. A large number of dewatering holes 5 a are provided on the peripheral side portion of the dewatering basket 5 to blow off moisture contained in the laundry.

  A washing motor 6 and a dehydrating motor 7 are disposed on the inner bottom of the outer box 1. The rotation shaft 6 a of the washing motor 6 is coupled to the drive shaft 4 a of the pulsator 4 via the power transmission mechanism 8. The power transmission mechanism 8 includes a drive pulley 9a attached to the rotary shaft 6a, a driven pulley 9b attached to the drive shaft, and a belt 10 that is stretched between the pulleys 9a and 9b. Thus, the washing motor 6 rotates the pulsator 4 through the power transmission mechanism 8 to agitate the laundry (not shown) accommodated in the washing tub 2 together with the washing water, thereby washing (or rinsing). ) Is to be performed. The rotation shaft 7 a of the dehydration motor 7 extends upward through the inner bottom portion of the dehydration tank 3 and is directly connected to the center of the outer bottom portion of the dewatering basket 5. The dehydration motor 7 rotates the dehydration basket 5 directly at high speed, thereby centrifugally dehydrating the laundry accommodated in the dehydration basket 5.

  As shown in FIG. 2 (b), a water inlet of a drain valve 13 is connected to a drain outlet 11 at the bottom of the washing tub 2 through a drain pipe 12. The drain valve 13 is driven by a drain valve solenoid 13a (see FIG. 3). The drain valve 13 is in an open state in which water is discharged from the washing tub 2 in conjunction with the solenoid 13a being turned on and off, and is in a closed state in which water is not discharged. Switched between. A drain pipe 15 is connected to the outlet of the drain valve 13 and the drain 14 at the bottom of the dewatering tank 3. Specifically, the drain pipe 15 includes a washing tub-side drain hose 15a, a dewatering tub-side drain hose 15b, and a common drain hose 15c downstream from the junction 15p to which both the hoses 15a and 15b are connected. The common drain hose 15c extends to the outside of the machine, and the water in the washing tub 2 and the dewatering tub 3 is drained to an external drainage place (not shown) through the drain pipe 15.

  As shown in FIG. 2A, an operation panel 16 having a horizontally long shape is provided on the outer box 1 so as to be positioned behind the washing tub 2 and the dehydrating tub 3. The operation panel 16 includes a display unit 17 and an operation input unit 18. Although not shown in detail, the operation input unit 18 is provided with a plurality of operation switches such as “start / pause” and “time” operation switches. By operating the “time” operation switch, for example, each of the washing time, the rinsing time, and the dehydration time can be set to any time such as “15 minutes”, “10 minutes”, “5 minutes”, and the like. In addition, the operation input unit 18 is provided with an operation switch capable of setting a “short time course” which is suitable when it is desired to end washing quickly.

  In addition, a hose connection portion 19 is provided at the upper portion of the outer box 1 so as to be positioned to the right of the operation panel 16. The hose connection portion 19 is for connecting the other end portion of a water supply hose (not shown) whose one end portion is connected to a tap. The tap water supplied from the water supply hose is guided to the inside of the washing tub 2 through the hose connection part 19. A washing lid 20 that opens and closes the upper surface opening of the washing tub 2 is detachably provided at the top of the outer box 1, and a dehydration lid 21 that opens and closes the upper surface opening of the dehydration tub 3 is vertically moved with the rear portion as a fulcrum. Rotation in the direction is possible.

  FIG. 3 schematically shows the electrical configuration of the two-tub washing machine. The control device 23 is mainly composed of a microcomputer, and controls the washing motor 6 and the dehydrating motor 7 based on an operation signal from the operation input unit 18 and an input signal from a current sensor 33 (to be described later). It is designed to control operation. The control device 23 includes a storage unit 24 including, for example, a ROM, a RAM, an EEPROM, and the like, and the storage unit 24 includes a program for controlling the washing operation and information on the control conditions (related to a threshold described later). Each information) is stored.

  Between the power supply buses 27a and 27b connected to the commercial AC power supply 26, a series circuit of the triacs 28 to 31 and the solenoid 13a or the coils of the motors 6 and 7 is connected. The gate signals of the triacs 28 to 31 are given by the control device 23.

  When the triac 31 is turned on, the solenoid 13a is energized and the drain valve 13 is switched to the open state. The triacs 28 and 29 are connected to coils 6b and 6c of the washing motor 6 which is a condenser motor (induction motor), respectively. When the triac 28 is turned on, the coil 6b is energized as the main coil and the washing motor 6 is rotated forward, and when the triac 29 is turned on, the coil 6c is energized as the main coil and the washing motor 6 is reversed. The triac 30 is connected to a coil 7b of a dehydrating motor 7 that is a condenser motor (induction motor). When the triac 30 is turned on, the dehydrating motor 7 rotates with the coil 7b as a main coil.

  A zero cross detection circuit 32 is provided between the power buses 27a and 27b. As shown in FIG. 4, the zero-cross detection circuit 32 outputs a zero-cross detection signal synchronized with the zero-cross of the AC voltage and gives it to the control device 23. In the figure, the energization rate (energization angle) Z% is the time energization ratio with respect to the half wave of all energization. When the energization rate Z is 100%, all energization is performed, and when the energization rate is 0%, The AC voltage is not applied. Thus, the control device 23 controls the phase of the power supply voltage by controlling the energization rate Z of the triac 30 based on the detection signal of the zero cross detection circuit 32.

Now, the control device 23 of the present embodiment controls the washing operation so as not to exceed the preset overall threshold with respect to the control conditions for executing the washing operation on the washing tub 2 side and the dewatering tub 3 side. .
Specifically, a current sensor 33 (current transformer) as current detection means shown in FIG. 3 is provided so as to detect the current flowing through the washing motor 6 and the dehydrating motor 7. A current value detected by the current sensor 33 is given to the control device 23, and a total current value obtained by summing currents flowing through the motors 6 and 7 is detected. Then, when driving the motors 6 and 7, the control device 23 sets the value Tα (see FIG. 1) for the total current value as the overall threshold value, and sets both the motors 6 and 7 so as not to exceed this. Control separately. For example, the threshold value Tα is set in advance with reference to the current capacity (15A) defined for the power cord of home appliances, and the power cord is more than normal even if both motors 6 and 7 are driven simultaneously. An overheated state is prevented. As a result, even if the motors 6 and 7 are set to have a large output, the rated current is not exceeded and problems such as operation of the breaker do not occur.

  Further, the control device 23 uses a value Tβ (see FIG. 5) relating to the total water amount obtained by summing the drainage amount per unit time from the washing tub 2 side and the drainage amount per unit time from the dehydration tub 3 side as the overall threshold value. In order not to exceed this, drainage control on the washing tub 2 side by the drainage valve 13 and drive control of the dehydration motor 7 are executed. For example, the threshold value Tβ is set to a value that does not exceed the drainage capacity of the drainage channel 34 (see FIG. 2B) including the drainage valve 13 and the drainage pipes 12 and 15. That is, the amount of drainage per unit time from the washing tub 2 side and the dehydration basin 3 side, that is, the drainage capacity of the drainage channel 34 is determined by the cross-sectional area of the drainage valve 13 and drainage pipes 12 and 15, etc. In the case where drainage is performed in duplicate on the washing tub 2 side and the dewatering tub 3 side, it is assumed that the amount of generated drainage exceeds the value Tβ. For example, the drainage channel 34 is filled with drainage on the washing tub 2 side. If it is, the drainage from the dehydration tank 3 is not discharged but accumulated in the tank, and it is considered that the rotation of the dewatering tank 5 is obstructed. Therefore, as shown in FIGS. 5 (a) and 5 (b), when draining from the washing tub 2 in which the specified amount of water is stored by the drain valve 13, the dehydrating motor 7 is operated until a predetermined time tβ at which the amount of drainage per unit time decreases. The dehydrating motor 7 is driven when time tβ does not start.

  During drainage on the washing tub 2 side by the drain valve 13, the dewatering motor 7 may be driven at a rotational speed lower than the steady rotational speed to suppress the drainage amount low. Further, as will be described in detail later, the drain valve 13 is controlled so that water is not discharged from the washing tub 2 side during drainage on the dehydration tub 3 side. Thereby, even when drainage is performed in duplicate on the washing tub 2 side and the dehydration tub 3 side, the drainage amount per unit time from the common drainage hose 15c does not exceed the threshold value Tβ, and the dehydration tub 3 overflows. There is nothing.

  In the washing operation of the present embodiment, the motors 6 and 7 are driven as described above to perform washing or rinsing and dehydration in parallel (step B4 in FIG. 6B, etc.). reference). In this case, the control device 23 sets a value relating to the operation time until both the washing or rinsing and dehydration processes are completed as the overall threshold value, and controls the washing operation so as not to exceed this value. For example, the control device 23 sets a longer time among the washing time or the rinsing time and the dehydration time as the threshold value Tγ. And, as will be described in the following explanation of the operation, when the washing or rinsing process and the dehydration process are performed in parallel, both processes are completed simultaneously so that the required time does not exceed the threshold Tγ. Yes.

  The operation of the above configuration will be described below with reference to FIGS. The washing tub 2 of the two-tank type washing machine has a smaller capacity for storing the laundry than the washing tub (not shown) of a so-called fully automatic washing machine or drum type washing machine, and the user performs washing in multiple times. There are many. In this embodiment, in FIGS. 6 (a) and 6 (b) showing the procedure when washing is performed in two steps, the number 1 surrounded by a circle represents the laundry first stored in the washing tub 2 The number 2 surrounded by a circle represents a laundry different from the laundry. Further, in the present embodiment, in the “short-time course”, as shown in FIG. 6B, the required time can be greatly shortened by performing washing or rinsing and dehydration in parallel. In order to clarify the characteristics, a normal procedure will be briefly described first.

(1) Normal procedure As shown in FIG. 6 (a), in the normal procedure, the washing-dehydration process executed in steps A1 to A11 and the washing-dehydration executed in steps A12 to A22 thereafter. Laundry is performed in two steps. Specifically, after the user puts detergent and laundry into the washing tub 2 and supplies water to a predetermined water level (step A1), the “time” operation switch and “start / pause” operation switch of the operation input unit 18 To operate. Thereby, the control apparatus 23 starts washing | cleaning by rotating the washing motor 6 forward and backward (step A2). In this case, the control device 23 drives the washing motor 6 by alternately outputting gate signals to the triac 28 and the triac 29. However, for the sake of convenience, the description related to the gate signal is omitted below.

When the washing time has elapsed, the control device 23 switches the drain valve 13 to the open state and discharges the water in the washing tub 2 (step A3). When the user moves the washed laundry from the washing tub 2 to the dehydration tub 3 (the dehydration basket 5), defoaming dehydration is performed by driving the dehydration motor 7 (steps A4 and A5). Thereafter, the user returns the dehydrated laundry from the dehydrating tub 3 to the washing tub 2 (step A6), and when water is supplied again to the predetermined water level as described above, rinsing by driving the washing motor 6 is started (step A7). , A8). When the rinsing time has elapsed, the control device 23 switches the drain valve 13 to the open state and discharges the water in the washing tub 2 (step A9). Then, when the user moves the laundry after rinsing from the washing tub 2 to the dehydration tub 3, dehydration is performed by driving the dehydration motor 7 (steps A10 and A11).
Since the washing | cleaning-spin-drying | dehydration same as step A1-A11 is performed in step A12-A22 about the laundry accommodated in the washing tub 2 after that, the description is abbreviate | omitted.

(2) Procedure when performing washing or rinsing and dehydration in parallel In step B1 of FIG. 6B, the user puts detergent and laundry into the washing tub 2 and supplies water to a predetermined water level. The operation input unit 18 is operated. In this case, when “time saving course” is selected in addition to the “time” in the operation input unit 18, the control device 23 executes a washing operation for completing a period from washing to dehydration in a short time.

  Specifically, the control device 23 first executes a washing process by driving the washing motor 6 for the laundry put into the washing tub 2 (step B2). When this washing time has elapsed, the user moves the laundry that has been washed in step B2 from the washing tub 2 to the dehydration tub 3, and puts a laundry different from the laundry into the washing tub 2 (step). B3). In step B4, the process of defoaming dehydration by driving the dewatering motor 7 for the former laundry and the process of washing by driving the washing motor 6 for the latter laundry are executed in parallel. Therefore, the process corresponding to the drainage of step A3 is omitted, and the latter laundry is subjected to the second washing process using the former washing liquid.

  In step B4, the control device 23 controls the phase of the applied voltage of the dehydrating motor 7 so as not to exceed the threshold value Tα related to the total current value. In this case, as illustrated in FIG. 1, since the AC power supply 26 is fully energized to the dehydrating motor 7 at the start of the dehydration process, the rotation speed rises sequentially and reaches a substantially steady rotation speed (see FIG. 1). At time tα1), power is supplied by the phase control. Since this electric power is lower than that in the case of full energization (see FIG. 4), the current flowing through the dehydrating motor 7 is reduced and the rotational speed of the dehydrating motor 7 is also reduced. In this way, the energization pattern is switched at the time tα1 a predetermined time before the washing process starts, and the washing process is started at the time tα2 when the current flowing through the dehydrating motor 7 decreases. For this reason, as is clear from the comparison between the solid line and the two-dot chain line in the figure, even if both the motors 6 and 7 are driven, the total current value does not exceed the threshold value Tα.

  When washing and defoaming dewatering are performed in parallel as in step B4, both the steps of washing and defoaming dehydration can be completed simultaneously. That is, the control device 23 collates the washing time and the dehydration time, and sets the phase control start time tα1 and the washing start time tα2 so that both processes end at the same time (may be substantially simultaneous). As a result, the time required for both strokes does not exceed the threshold Tγ, and the control device 23 switches the drain valve 13 to the open state when the washing and defoaming strokes are completed, and the washing tank 2 Water is discharged (step B5). Accordingly, water is not discharged from the washing tub 2 side during the defoaming dewatering in Step B4, that is, during the drainage on the dehydrating tub 3 side.

  The user moves the laundry that has been washed and drained in Step B4 and Step B5 from the washing tub 2 to the dehydrating tub 3, and returns the laundry that has been defoamed in Step B4 to the washing tub 2 (Step S4). B6). Thereafter, defoaming dewatering on the dewatering tub 3 side and water supply up to a predetermined water level on the washing tub 2 side are performed in Step B7, and rinsing in the washing tub 2 is performed in Step B8. In step B7, when the defoaming dehydration is longer than the water supply, both the motors 6 and 7 may be driven as described above to perform the defoaming dehydration and the rinsing in step B8 in parallel. Also in this case, the total current value does not exceed the threshold value Tα by the phase control, and the entire operation time can be shortened.

  After completing the steps of defoaming and rinsing, the control device 23 switches the drain valve 13 to the open state and discharges the water in the washing tub 2 (step B9). The user moves the laundry that has been rinsed and drained from the washing tub 2 to the dehydration tub 3 again, and returns the laundry that has been defoamed in step B7 into the laundry tub 2 (step B10). And the final dehydration is performed on the side of the dehydrating tub 3 on the laundry that has started washing (the laundry related to the left stroke in FIG. 6B), and water supply up to a predetermined water level is performed on the side of the laundry tub 2 Is performed (step B11). Also for the laundry according to the right stroke in FIG. 6B, final dehydration is performed after rinsing, draining, and transfer from the washing tub 2 to the dehydrating tub 3 after water supply (steps B12 to B15).

  The dehydration in the step B11 may be executed in the rinsing process of the step B12. Even when both the motors 6 and 7 are driven simultaneously as described above, the total current value exceeds the threshold value Tα by the phase control. The overall operation time is shortened. In this case, the drainage of step B13 is executed after the dehydration is completed, so that water is not discharged from the washing tub 2 side during the drainage of the dehydration tub 3 side (step B13). Thus, each process is not limited to the order of the above-described steps. For example, when the dehydration process is performed during the drainage on the washing tub 2 side by the drain valve 13, the dehydration motor 7 is lower than the steady rotation speed. By driving at the rotational speed, the amount of drainage can be prevented from exceeding the threshold value Tβ.

  As described above, the control device 23 controls the washing operation so as not to exceed the entire threshold set in advance with respect to the control conditions for executing the washing operation on the washing tub 2 side and the dehydration tub 3 side. It is configured as a control means. According to this, by setting the whole threshold value as a control condition in advance, it becomes possible to perform an automatic washing operation under conditions suitable for both the washing tub 2 side and the dewatering tub 3 side. . Therefore, the convenience and reliability of the two-tub washing machine can be improved while shortening the washing time.

  The control device 23 performs the dehydration performed by storing the laundry that has been washed or rinsed in the washing tub 2 in the dehydration basket 5 and the washing or cleaning performed by storing the laundry different from the laundry in the laundry tub 2. The washing operation in which the rinsing is performed in parallel is configured to be possible, and the threshold value Tα regarding the total current value obtained by summing the current flowing in the washing motor 6 and the current flowing in the dehydrating motor 7 is not exceeded as the overall threshold value. In addition, the driving of the washing motor 6 and the dehydrating motor 7 is controlled separately.

  According to this, even when both motors 6 and 7 are driven simultaneously, the total current value does not exceed the threshold value Tα, so that the power cord is prevented from being overheated more than usual, for example, and the rated current It does not exceed, and there is no problem that the breaker operates. Moreover, according to this, power consumption can be suppressed and the energy saving effect can be enhanced.

  The control device 23 controls the dehydrating motor 7 so as not to exceed the threshold value Tα related to the total current value by phase-controlling the applied voltage (or controlling the duty ratio described later). According to this, the total current value can be reduced by a change in the energization rate Z (or the duty ratio of power interruption) related to the dehydration motor 7, and the occurrence of the above-described problem can be prevented by simple control. There is a special effect. Moreover, about washing | cleaning or a rinse which requires comparatively time, the dehydration process can be performed in parallel, without interrupting the process, and operation time can be shortened reliably.

  The dehydrating motor 7 is not limited to an induction motor but may be appropriately changed such as a brushless DC motor (not shown), and controls the duty ratio (or duty ratio by PWM control means for performing PWM control) for various motors. May be. For example, although not shown in the figure, a configuration including an inverter circuit of the brushless DC motor may be employed, and duty ratio control may be performed on the DC motor by changing the ON time and OFF time by a control unit. The drive control of the inverter circuit is simplified.

  The washing machine of this embodiment has a common drain line connected to the drain valve 13 side and the dehydration tank 3 side so that the water discharged from the drain valve 13 and the dehydration tank 3 is joined and discharged. 15, the control device 23 does not exceed a threshold value Tβ relating to the total water amount, which is the sum of the drainage amount per unit time from the drainage valve 13 and the drainage amount per unit time from the dewatering tank 3 side, as the overall threshold value. Then, drainage control by the drainage valve 13 and / or drive control of the dehydrating motor 7 are executed.

  According to this, for example, by setting the threshold value Tβ to a value that does not exceed the drainage capacity of the drainage channel 34 described above, the channel cross-sectional areas on the washing tub 2 side and the dewatering tub 3 side are not related (that is, drainage is performed). It is possible to prevent water from overflowing into the dewatering tank 3 without changing the design such as the diameter of the pipe line 15 or the like.

  Further, the control device 23 drives or stops the dehydrating motor 7 at a lower rotational speed than the steady rotational speed during draining on the washing tub 2 side by the drain valve 13, or washing is performed during draining on the dehydrating tub 3 side. The drain valve 13 is controlled so as not to discharge water from the tank 2 side. According to this, it is possible to adjust the drive of the dehydration motor 7 and the operation of the drain valve 13 so as to shorten the operation time as much as possible while reliably preventing the above-described overflow of water.

  When the controller 23 executes washing or rinsing and dehydration in parallel, the threshold Tγ related to the operation time until both the washing or rinsing and dehydration processes are completed is not exceeded as the overall threshold. The washing operation is controlled. According to this, about the process of washing or rinsing and the process of dehydration, the operation can be performed in parallel on the washing tub 2 side and the dehydration tub 3 side, and the overall required time can be reduced.

  The control device 23 controls the washing operation so that the washing or rinsing process and the dehydration process are completed at the same time. According to this, the washing operation peculiar to the two-tank washing machine, for example, the operation of transferring the laundry from the washing tub 2 to the dehydrating tub 3, and the operation of returning the laundry after defoaming dehydration into the washing tub 2 The former laundry can be performed when the washing is completed, and the latter laundry can be performed when the dehydration is completed. Therefore, the user can efficiently perform the washing work and can be easily used. Note that the washing operation may be controlled so that the washing or rinsing process and the dehydration process are finished at “substantially simultaneously”. In this case, the same effect as described above can be obtained.

  In step B4, control is performed so as to “wash” another laundry with the washing liquid used in the washing in step B2. This process is effective, for example, at the time of so-called separate washing, in which a laundry with light dirt is first washed and then a laundry with heavy dirt is washed. For this reason, the water supply before washing | cleaning of the said step B4 and the waste_water | drain after the said step B2 can be made unnecessary, and shortening of operation time can be aimed at. Therefore, in combination with the above configuration, the entire operation time can be shortened as much as possible (see FIGS. 6A and 6B).

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  In the drawings, 2 is a washing tub, 3 is a dehydrating tub, 4 is a stirring body, 5 is a dewatering basket, 6 is a washing motor, 7 is a dewatering motor, 13 is a drain valve, 15 is a drain pipe, and 23 is a control means. .

Claims (7)

In a two-tub washing machine equipped with a washing tub and a dewatering tub,
A washing motor for rotating a stirring body provided in the washing tub;
A dehydration motor for rotating a dewatering basket provided in the dewatering tank;
Control means for controlling the washing operation by driving the washing motor and the dehydration motor,
The control means controls the washing operation so as not to exceed an overall threshold set in advance with respect to control conditions for executing the washing operation on the washing tub side and the dewatering tub side. Two-tank washing machine. The control means includes
The dehydration performed by storing the laundry that has been washed or rinsed in the washing tub in the dewatering basket and the washing or rinsing performed by storing a laundry different from the laundry in the laundry tub are performed in parallel. It is configured to be capable of performing washing operations
Based on a value relating to a total current value including a current flowing through the washing motor and a current flowing through the dehydrating motor, the overall threshold is set, and the washing motor and the dehydrating motor are driven so as not to exceed this threshold. The two-tub washing machine according to claim 1, wherein the two-basin washing machine is controlled separately.   3. The two-tank laundry according to claim 2, wherein the control means controls the dehydrating motor so as not to exceed a threshold relating to a total current value by phase controlling an applied voltage or controlling a duty ratio. Machine. A drain valve for discharging water from the washing tub;
A common drain line connected to each of the drain valve side and the dehydration tank side so as to join and drain water discharged from the drain valve and the dehydration tank,
The control means includes
The dehydration performed by storing the laundry that has been washed or rinsed in the washing tub in the dewatering basket and the washing or rinsing performed by storing a laundry different from the laundry in the laundry tub are performed in parallel. It is configured to be capable of performing washing operations
Based on the total water amount based on the total amount of drainage per unit time from the drainage valve and the amount of drainage per unit time from the dewatering tank side, set as the overall threshold, so as not to exceed this, The two-tank washing machine according to claim 1, wherein drainage control by a drainage valve and / or drive control of the dewatering motor are executed. The control means includes
During draining on the washing tub side by the drain valve, the dehydrating motor is driven or stopped at a rotational speed lower than a steady rotational speed,
5. The two-tub washing machine according to claim 4, wherein the drain valve is controlled so that water is not discharged from the washing tub during draining on the dehydrating tub side. The control means includes
The dehydration performed by storing the laundry that has been washed or rinsed in the washing tub in the dewatering basket and the washing or rinsing performed by storing a laundry different from the laundry in the laundry tub are performed in parallel. It is configured to be capable of performing washing operations
When the washing or rinsing and the dehydration are performed in parallel, the overall threshold is set based on the value related to the operation time until both the washing or rinsing and dehydration processes are completed. 2. The two-tank washing machine according to claim 1, wherein the washing operation is controlled so as not to occur.   7. The two-tank washing machine according to claim 6, wherein the control means controls the washing operation so that the washing or rinsing process and the dehydration process are completed almost simultaneously.

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