JP2015062509A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum-type washing machine capable of washing with a large flow rate.SOLUTION: In a drum-type washing machine including a circulation pump sucking water from an outer tub and circulating the water toward the inside of a drum, a water storage tank is provided in the middle of a piping route from the bottom part of the outer tub to the circulation pump. The washing operation of the drum-type washing machine includes: a first washing operation in which water is circulated by the circulation pump without passing through the water storage tank; and a second washing operation in which water is circulated by the circulation pump while passing through the water storage tank. The revolution speed of the circulation pump in the second washing operation is set higher than the revolution speed of the circulation pump in the first washing operation.

Description

  The present invention relates to a washing machine for washing clothes and the like, and more particularly, to a drum-type washing machine including a drum that is inclined substantially horizontally or forwards upward.

  The drum type washing machine performs washing, rinsing, and dehydrating processes by putting clothes in a drum having a rotating shaft that is substantially horizontal or inclined with the front facing upward. In addition to the above, a drying process is further provided. In the washing process and the rinsing process, the drum is rotated at a low speed, the garments accumulated below the drum are lifted and dropped from above the drum. By this tumbling operation, washing and rinsing are performed by applying mechanical force to the clothes. At the time of the dehydration process, the drum is rotated at a high speed, and centrifugal dehydration is performed by pushing out moisture from the clothes by the centrifugal force generated by the rotation.

  Further, in the washing process, a circulation pump is provided to enhance the washing effect, and the washing water in the washing tub (outer tub) is pumped up and applied to the clothing, so that the washing water in which the detergent is dissolved penetrates the clothing evenly. As described above, the drum type washing machine can save water by securing washing performance with less water than the vertical washing machine by tumbling operation and circulation of washing water by the circulation pump. .

  In the following Patent Document 1, a water tank capable of storing water, a rotating tank having a hole capable of passing water and rotatably disposed in the water tank, a water outlet and a water return port included in the water tank. A circulation water channel communicating outside the water tank, a circulation pump provided in the middle of the circulation water channel, the circulation water channel and the circulation pump, and the water in the water tank is pumped by the circulation pump A washing machine (drum type washing machine) is disclosed that includes a circulation device that circulates by being sucked through the circulation water channel by action and discharged from the water return port into the water tank (see claim 1). Incidentally, it is disclosed that the rotational speed of the pump motor of the circulation pump is set higher than 3600 rpm (see claim 3).

  Further, in Patent Document 2 below, “the washing tub is provided with a water storage tank connected to the front and lower portions, and washing water or rinsing water is supplied into the water storage tank through the water supply pipe, and is then supplied to the inside of the rotating drum through the circulation water pipe. A water collecting part is provided at the lower rear part of the washing tub away from the connecting part of the water storage tank, and the water flowing down along the bottom plate of the washing tank is not returned to the water storage tank but collected in the water collecting part. Thus, a washing machine is disclosed that is configured to be discharged to the outside of the machine through a communication pipe and a drain pipe (see Solution).

JP 2009-55999 A JP 2011-250944 A

  However, in general, a drum-type washing machine has a small amount of washing water in the washing tub (outer tub) in the washing process due to water saving, so that when the clothes are dirty, the dirt peeled off from the clothes adheres to the clothes again. May darken.

  In addition, the drum type washing machine has a large drop impact on the clothing during the tumbling operation, and the clothing may be stiff.

  Patent Document 1 discloses a drum type washing machine in which the rotational speed of the pump motor of the circulation pump is made higher than 3600 rpm. However, it is not easy to maintain the amount of water for stably maintaining the circulation flow rate in the water tank. Absent. This is because even if the amount of water is simply increased, a large water pressure is applied to the door, outer tub, and duct communicating therewith, and it is necessary to provide a water sealing structure and safety measures that do not cause water leakage due to deformation etc. .

  On the other hand, Patent Document 2 discloses a drum-type washing machine having a water storage tank connected to the front lower portion of the washing tub. No consideration is given to the control relating to the operation method and the circulation flow rate.

  Accordingly, an object of the present invention is to provide a drum that can ensure the amount of water supplied to the suction side of the pump and perform cleaning with a large flow rate in order to avoid air entrainment due to insufficient water supply to the circulation pump and to operate stably. It is to provide a type washing machine.

  In order to solve such a problem, in the present invention, an outer tub capable of storing a liquid therein, a drum rotatably supported in the outer tub and storing laundry, and the drum being driven to rotate A drum motor, a water supply means for supplying water into the outer tub, a circulation pump for sucking water from the outer tub and circulating the water into the drum, the drum motor, the water supply means and the circulation pump A drum-type washing machine comprising: an operation control means for controlling a water storage tank provided in the middle of a piping path from the bottom of the outer tub to the circulation pump, and the circulation pump without water passing through the water storage tank. And a second washing operation in which water is circulated by the circulation pump through the water storage tank, and the rotational speed of the circulation pump in the second washing operation is determined by the first washing operation. of It was higher than the rotational speed of the circulating pump in the stomach operation.

  ADVANTAGE OF THE INVENTION According to this invention, the drum type washing machine which can perform washing | cleaning by a large flow rate can be provided.

It is an external appearance perspective view which shows the drum type washing-drying machine which concerns on embodiment of this invention. It is a schematic sectional drawing of the right side surface which shows the internal structure of the drum type washing-drying machine which concerns on embodiment of this invention. (A) is a schematic perspective view from the outer tub of the drum type washing / drying machine according to the first embodiment of the present invention to the circulation pump, and (b) is a sectional view seen from the bottom of the drum type washing / drying machine. is there. It is a schematic sectional drawing of the upper left side which shows the internal structure of the drum type washing-drying machine which concerns on embodiment of this invention. It is a top (sectional) figure of a drum type washing machine concerning an embodiment of the present invention. It is a front (cross section) figure of the upper left side of the drum type washing / drying machine which concerns on embodiment of this invention. It is a block diagram which shows the structure of the control apparatus of the drum type washing-drying machine which concerns on embodiment of this invention. It is process drawing explaining the driving | operation process of the washing operation in the drum type washing / drying machine which concerns on 1st Embodiment. It is a table | surface which shows the relationship of the operation parameter of the pre-washing process of the drum type washing-drying machine which concerns on 1st Embodiment, 1 main washing process, and 2 main washing processes. (A) is a graph which shows the relationship between the rotational speed of a circulating pump, and a washing | cleaning ratio, (b) is a graph which shows the relationship between the rotational speed of a circulating pump, and a circulating flow rate. (A) is a schematic perspective view from the outer tub of the drum-type washing / drying machine to the circulation pump according to another embodiment of the first embodiment of the present invention, and (b) is a cross section seen from the bottom of the drum-type washing / drying machine. FIG. It is a table | surface which shows the relationship of the operation parameter of the pre-washing process of the drum type washing-drying machine which concerns on 1st Embodiment, 1 main washing process, and 2 main washing processes. It is a schematic perspective view from an outer tub to a circulation pump in the drum type washing and drying machine concerning a 2nd embodiment. It is a schematic perspective view which shows the water storage tank internal structure of the drum type washing-drying machine which concerns on 2nd Embodiment. It is a schematic plan view which shows the water tank internal cross-sectional structure of the drum type washing-drying machine which concerns on 2nd Embodiment. It is a schematic perspective view which shows the structure of the water storage tank of the drum type washing-drying machine which concerns on embodiment of this invention.

  Hereinafter, examples will be described with reference to the drawings. Since the washing process is the same for both the drum-type washing machine and the washing / drying machine, the drum-type washing / drying machine will be described in the following examples.

  FIG. 1 is a perspective view of a drum type washer / dryer according to a first embodiment of the present invention. Further, FIG. 2 relates to the first embodiment of the present invention, in which the air pressurized by the fan 20 is blown into the drum 3 rotating at a predetermined rotational speed to exchange heat with the laundry 207. The sectional view of the washing and drying machine at the time of the drying process in which moisture is evaporated from the laundry 207 and the air containing the vapor is finally exhausted from the drainage port 21 at the bottom of the outer tub 2 to the outside through the drainage hose 26 is shown. . FIG. 3 is a schematic perspective view showing a piping system from the bottom of the outer tub 2 to the circulation pump 18 through the water storage tank 217 according to this embodiment. First, the appearance will be described. A skeleton is constructed by combining a side plate 1a mainly made of a steel plate and a resin molded product and a stay (not shown) on the upper portion of the base 1h, and further a front cover 1c, a lower front cover 1f, and an upper cover are formed thereon. The housing 1 is formed by attaching 1e. The front cover 1c is provided with a door 9 for taking in and out the laundry 207, and a back cover 1d is attached to the back.

  Next, a schematic structure of the washing / drying machine will be briefly described. As shown in FIG. 2, an outer tub 2 is provided inside the housing 1 shown in FIG. The outer tub 2 is supported by a plurality of lower dampers 5. On the drum 3 rotatably provided inside the outer tub 2, the door 9 is opened and the laundry 207 is put in. A fluid balancer 208 is provided on the outer periphery of the opening of the rotatable drum 3 in order to reduce vibration due to unbalance of the laundry 207 during dehydration. In addition, a plurality of lifters 209 for scraping the laundry 207 is provided inside the drum 3. The rotatable drum 3 is directly connected to a drum driving motor M10a via a main shaft 211 connected to a metal flange 210 for the rotating drum. A rubber bellows 10 made of an elastic body is attached to the opening of the outer tub 2. The rubber bellows 10 serves to maintain the watertightness between the outer tub 2 and the door 9. This prevents water leakage during washing, rinsing and dehydration. The rotatable drum 3 has a large number of small holes (not shown) for centrifugal dehydration and ventilation in a cylindrical portion which is a side wall. The drain port 21 opened in the bottom wall of the outer tub 2 is connected to the drain hose 26 via the drain valve V1. The overflow hose 205 is attached to the air duct 29 on the rear surface of the drum, and joins with a connecting hose (not shown) from the drain port 21 before the drain valve V1. That is, when the drain valve V1 is opened, the drain hose 26 is communicated.

  A drying device 201 including an air duct 29 that guides air to the laundry 207 in the drum 3, a fan 20 that is an air blowing unit, and a heater 213 is fixed to the housing 1 (not shown) apart from the outer tub 2. The blow-out nozzle 203 is fixed to the outer tub 2 at a position on the upper side of the drum 3 that is rotatable when viewed from the front of the washing / drying machine and on the front side of the washing / drying machine as viewed from the side. The outlet of the blowout nozzle 203 and the heater 213 is connected with a flexible bellows tube 212 made of rubber and arranged so that its longitudinal expansion / contraction direction is substantially perpendicular to the outer tub 2. Absorbs. Temperature sensors (not shown) are provided at the drain port 21, the intake port (not shown) and the discharge port (not shown) of the fan 20. The heater 213 which is a heating means of the present embodiment is used to adjust the blowing temperature as necessary.

  In the washing and drying machine having the above-described structure, the present embodiment performs a washing operation that suppresses darkening and wrinkling. In addition, the washing operation that suppresses darkening and wrinkling can be canceled according to the quality of the fabric and the load. Next, the components related to the washing process for suppressing darkening and wrinkling will be described in order.

  FIG. 3 shows a piping system from the bottom of the outer tub 2 to the circulation pump 18 through the water storage tank 217 as described above. In the figure, (a) is a schematic perspective view of the drum type washing and drying machine as viewed from the right front side, and (b) is a sectional view as viewed from the bottom. The washing water at the time of washing passes through the branch 219 divided from the drain port 21 of the outer tub 2 into the water storage tank 217 and the bypass path 218, and then is divided into a flow entering the water storage tank 217 and a flow entering the bypass path 218. An opening / closing valve 220 is provided at the inlet of the water storage tank 217. If the opening / closing valve 220 is closed, the wash water flows into the bypass passage 218, and if it is open, it flows down to the water storage tank 217 as well. After flowing through the water storage tank 217 and the bypass path 218, after joining at the junction 221, it flows through the waste thread filter 222 to the suction port of the circulation pump 18. In this embodiment, since the water storage tank 217 is fixed to the base 1h, it is preferable that the water storage tank 217 be connected with the outer tub 2 that shakes due to the vibration of the drum 3 when the drum 3 rotates. For this reason, a pipe A223 connecting the outer tub 2 and the on-off valve 220 partially uses a bellows hose (not shown). Moreover, when the water storage tank 217 is fixed to the outer tub 2 side due to restrictions on the installation space or the like, it is preferable that a part of the pipe B224 from the junction 221 to the waste thread filter is a bellows hose.

  The configuration of the detergent charging unit will be described. FIG. 4 is a cross-sectional view of the vicinity of the upper left detergent introduction portion toward the main body. FIG. 5 is a cross-sectional view of the upper part of the washing / drying machine as seen from above, and FIG. 6 is a cross-sectional view around the detergent container 72 as seen from the front of the main body. The detergent charging part 7 is a part where a detergent such as powder detergent, liquid detergent (or bleaching agent), softening agent (soft finishing agent) and the like is charged. ing. The detergent charging unit 7 includes a drawer-type tray 71, a detergent container 72 provided in the tray 71, a powder detergent charging chamber 73, a liquid detergent charging chamber 74, and a soft finish loading chamber 75 formed in the detergent container 72. An outlet 76 and a siphon 77 provided at the bottom of the detergent container 72, water supply pipes P1 and P2 for supplying water into the detergent charging unit 7, and the detergent and water in the detergent charging unit 7 in the outer tub 2 Detergent supply pipe P3 to be supplied to water, water supply unit 15 and the like.

  As shown in FIG. 5, the detergent container 72 includes a powder detergent charging chamber 73 into which powder detergent is charged, a liquid detergent charging chamber 74 into which liquid detergent (or bleaching agent) is charged, and a soft finish into which a soft finish is charged. It is divided into an agent charging chamber 75. On the rear side of the detergent container 72, components related to water supply such as a water supply electromagnetic valve 16, a bath water supply pump 17, and a water level sensor 34 are provided. The upper opening of the detergent container 72 includes a water supply unit 15 to which the water supply electromagnetic valve 16 is attached.

  Here, the water supply electromagnetic valve 16 is composed of four electromagnetic valves, one of which controls the water supply to the powder detergent charging chamber 73 and the liquid detergent charging chamber 74 via the water supply pipe P1 by opening and closing. Is controlled by opening and closing the water supply to the flexible finishing agent charging chamber 75 via the water supply pipe P2, and one is water supply to the water supply port 2a (see FIG. 4) of the outer tub 2 via the water supply pipe (not shown). One is for controlling the water supply to the water cooling / dehumidifying mechanism (not shown) of the drying duct 29 via the water supply hose 32.

  In addition, a water spout (not shown) for sprinkling water on the top of the outer tub 2 or the drum 3 is provided in the outer tub 2, and water is supplied to the sprinkler from a solenoid valve that controls water supply to the water sup- ply 2 a of the outer tub 2. You may be able to do it. Thereby, water can be stored in the outer tank 2 and the upper part of the outer tank 2 or the upper part of the drum 3 can be washed. Furthermore, the drum 3 and the outer tub 2 can be washed evenly by sprinkling water to the upper part of the drum 3 while rotating the drum 3 and splashing and splashing to the upper part of the outer tub 2. In addition, you may provide a water sprinkling port so that water may be sprinkled inside the drum 3, and, thereby, water can be sprayed directly on the laundry in the drum 3, and the rinsing efficiency can be improved.

  As shown in FIG. 6, the detergent container 72 has an upper opening 72c and a front opening 72b, and a drawer-type tray 71 is attached to the front opening 72b. When putting detergents, the tray 71 is pulled out as shown by a two-dot chain line in FIG. The detergent container 72 is fixed to the upper reinforcing member 36 of the housing 1. The detergent container 72 has a bottom surface that is obliquely cut to prevent interference with the outer tub 2, and when viewed from the front, the right side is shallow and the left side is deep. Further, a water outlet 72 a is provided on the left side of the detergent container 72 and slightly behind it. Therefore, the bottom surface of the detergent container 72 is formed in a mortar shape such that the position of the water outlet 72a is the lowest. As shown in FIGS. 4 and 5, in the powder detergent charging chamber 73, an outlet 76 communicating with the detergent delivery pipe P3 and the water supply port 2a is formed in the inner bottom. The water supplied from the water supply pipe P1 into the powder detergent charging chamber 73 flows so as to swirl clockwise, melts the powder detergent, flows into the outlet 76, and flows into the detergent delivery pipe P3. In the liquid detergent charging chamber 74, a siphon 77 communicating with the outflow port 76 and the detergent delivery pipe P3 (see FIG. 5) is provided on the inner bottom. The water supplied from the water supply pipe P1 into the liquid detergent charging chamber 74 flows so as to vortex counterclockwise, dilutes the liquid detergent, flows into the siphon 77, and flows into the detergent delivery pipe P3. In the soft finishing agent charging chamber 75, a siphon 78 communicating with the outflow port 76 and the detergent delivery pipe P3 is provided on the inner bottom. The water supplied from the water supply pipe P2 into the soft finishing agent charging chamber 75 flows so as to vortex in the clockwise direction, dilutes the soft finishing agent, flows into the siphon 78, and flows into the detergent delivery pipe P3.

  Next, the configuration of the water supply unit will be described. As shown in FIG. 4, the water supply unit 15 (water supply means) is a device that supplies water to the water supply port 2 a provided outside the outer tank 2 and supplies the water into the outer tank 2. The water supply unit 15 is provided on the back side of the top cover 1e (see FIG. 4).

  As shown in FIG. 5, the water supply unit 15 includes a water supply hose 32, a water supply hose connection port 16a, a water supply electromagnetic valve 16, a bath water supply pump 17, the water absorption hose connection port 17a, and the water level sensor 34. The tube 35 is installed. The water supply hose 32 is a hose for supplying tap water to the detergent charging unit 7 into which detergent, soft finish, etc. are charged, and is connected to the water supply hose connection port 16a. The water supply hose connection port 16a is a connection part to which the other end of a hose (not shown) having one end attached to a tap water tap is connected. The water supply electromagnetic valve 16 injects tap water into the water supply pipe P1 that communicates with the powder detergent introduction chamber 73 and the liquid detergent introduction chamber 74 of the detergent introduction unit 7 and the water supply pipe P2 that communicates with the softener introduction chamber 75. It is a valve that performs opening / closing control of the valve body by electromagnetic force. As shown in FIG. 4, the tap water supplied into the powder detergent charging chamber 73, the liquid detergent charging chamber 74, and the soft finishing agent charging chamber 75 passes through the detergent delivery pipe P3 and the water supply port 2a together with the detergents and the soft finishing agent. Then, water is poured into the outer tub 2.

  As shown in FIG. 2, on the rear bottom surface of the outer tub 2, the drum 3 is rotatably supported in one end side, and the rotation shaft of the motor M10a is rotatably supported on the other end side. Inside the outer tub 2, a drum 3 having the rotating shaft fixed to the rear bottom surface is housed in a rotatable state. The outer tub 2 supports the front surface, the lower surface, and the upper surface as follows, thereby preventing the shake and falling. The front surface portion is elastically supported on the front inner wall of the housing 1 by a rubber bellows 10, and the lower surface portion is elastically supported by vibration damping by a damper 5 fixed to the base 1h. Further, the upper surface portion is elastically suspended from and supported by the ceiling surface of the housing 1 by an auxiliary spring 33 (see FIG. 5) attached to the upper reinforcing member 36.

  As shown in FIGS. 4 and 6, on the upper left side of the rear side of the outer tub 2, a water supply port 2 a (for supplying a liquid containing water, detergent, bleach, softener, etc. into the outer tub 2 ( Supply port) is provided. A detergent container 72 is provided on the upper left side in the housing 1, and the water supply port 2a and the water outlet 72a of the detergent container 72 are connected by a rubber bellows tube P4. A tube 35 is connected to the bottom of the rear end face of the outer tub 2 via an air trap (not shown). The upper end of the tube is connected to a water level sensor 34 (see FIG. 5). Detect the water level inside.

  Next, the configuration of the control device and the drive device will be described. FIG. 7 is a block diagram showing a configuration of the control device 100 of the drum type washer / dryer according to the embodiment of the present invention. The control device 100 (operation control means) controls the motor M10a (drive device M10) and the water supply unit 15 so that the washing operation can be performed, and is disposed in a recess formed in the inner bottom portion of the outer tub 2. Calculation of electrical conductivity (hardness) from the electrical conductivity of the liquid in the outer tub 2 detected by the electrical conductivity detection means 4, determination of the presence or absence of a soft finish contained in the liquid (discrimination relative to the reference concentration), dehydration process It is an apparatus that performs determination of shortening, determination of shortening of the rinsing process, and the like. As shown in FIG. 7, the control device 100 includes a microcomputer (hereinafter referred to as “microcomputer”) 110, a drive circuit, operation switches 12 and 13, conductivity detection means 4, input circuits from various sensors, and the like. . The microcomputer 110 receives various information signals in a user operation, a washing process, and a drying process. The microcomputer 110 is connected to the drive device M10 (motor M10a), the water supply electromagnetic valve 16, the drain valve V1, the blower fan 20, and the like through the drive circuit, and controls the opening / closing, rotation, and energization thereof. Further, in order to inform the user of the information related to the drum type washing machine S, the display 14 and the buzzer (not shown) are controlled.

  As shown in FIG. 2, the driving device M <b> 10 is a device that rotationally drives the drum 3, and is installed at the outer center of the bottom surface of the outer tub 2. The drive device M10 includes a motor M10a and other elements (not shown). The rotating shaft of the motor M10a passes through the outer tub 2 and is coupled to the drum 3. The motor M10a includes a rotation detection device 28 configured by a Hall element or a photo interrupter that detects the rotation, and a motor current detection device 25 (not shown) that detects a current flowing through the motor M10a.

  Thus, the control apparatus 100 is comprised centering on the microcomputer 110. FIG. The microcomputer 110 includes an operation pattern database 111, a process control unit 112, a rotation speed calculation unit 113, a clothing weight calculation unit 114, an electrical conductivity measurement unit 115, a detergent amount / wash time determination unit 116, and a turbidity determination. Unit 117 and a threshold storage unit 118.

  The operation switches 12 and 13 are configured to allow the user to input a driving course, and output the input signal to the microcomputer 110. The water level sensor 34 can detect the water level of water stored in the outer tub 2 and outputs the detected signal to the microcomputer 110. The temperature sensor T <b> 1 is provided in the lower part (for example, the drain port 21) of the outer tub 2 and can detect the temperature of the water stored in the outer tub 2. The temperature sensor T <b> 2 is provided on the intake side of the blower fan 20, and can detect the temperature of the air taken into the blower fan 20 from the outer tub 2. The temperature sensor T3 is provided on the exhaust side of the blower fan 20 and on the downstream side of the heater 19, and can detect the temperature of the air blown from the blower fan 20 into the drum 3. The signals detected by the temperature sensors T1 to T3 are output to the microcomputer 110. The acceleration sensor 27 is attached to the outer tub 2 and detects vibration of the outer tub 2 (drum 3). A signal detected by the acceleration sensor is output to the microcomputer 110. The rotation detection device 28 is composed of, for example, a resolver (a kind of rotation angle sensor), can detect the rotation of the motor M10a, and the detected signal is output to the microcomputer 110. The motor current detection device 25 can detect the current value of the motor M10a, and the detected signal is output to the microcomputer 110. The conductivity detection unit 4 can detect the conductivity of the water stored in the outer tub 2, and the detected signal is output to the microcomputer 110.

  The microcomputer 110 has a function of calling an operation pattern corresponding to the operation course input from the operation switches 12 and 13 from the operation pattern database 111 and starting washing or / and drying. The process control unit 112 has a function of performing operation control of each process of the washing process, the rinsing process, the dehydration process, and the drying process based on the operation pattern called from the operation pattern database 111. In each process, the process control unit 112 has a function of controlling the indicator 14, the water supply unit 15, the water supply electromagnetic valve 16, and the drain valve V1. Further, the process control unit 112 controls driving of the motor M10a of the driving device M10 via the motor driving circuit 121, and controls energization to the heater 213 by controlling ON / OFF of the heater switch 123, thereby providing a fan driving circuit. The blower fan 20 is controlled via 124, and the circulation pump 18 is driven and controlled via the circulation pump drive circuit 125.

  Here, the circulation pump 18 has a detergent melting operation for discharging water sucked from the drain port 21 from the circulation discharge port 54b of the depression, and a discharge provided in the opening of the outer tub 2 for water sucked from the drain port 21. It is possible to switch between a circulation operation for discharging from the outlet (not shown) into the drum 3. The configuration of the circulation pump 18 capable of switching the operation may be constituted by a circulation pump 18 and a switching valve (not shown). The structure which can switch a discharge direction by switching a rotation direction may be sufficient.

  The rotation speed calculation unit 113 has a function of calculating the rotation speed of the motor M10a based on the detection value from the rotation detection device 28 that detects the rotation of the motor M10a. The clothing weight calculation unit 114 has a function of calculating the weight of the laundry in the drum 3 (see FIG. 2) based on the rotation speed calculated by the rotation speed calculation unit 113 and the detection value of the motor current detection device 25. Have. Since the load for rotating the drum 3 increases due to the increase in the weight of the laundry and a large motor current flows through the motor M10a, the weight of the laundry is calculated from the motor current and the rotation speed of the motor M10a. can do. The conductivity measuring unit 115 has a function of measuring the conductivity of tap water and washing water using the detection value from the conductivity detecting means 4. The detergent amount / washing time determining unit 116 has a function of determining the amount of detergent and the rinsing time of the laundry based on the conductivity measured by the conductivity measuring unit 115 and will be described in detail later. The turbidity determination unit 117 has a function of determining the degree of dirt on clothing (hereinafter referred to as turbidity) based on the conductivity measured by the conductivity measurement unit 115. The threshold value storage unit 118 has a function of storing a threshold value used when the turbidity determination unit 117 determines the degree of dirt (turbidity) of clothes. Incidentally, the turbidity determination unit 117 and the threshold storage unit 118 are used in an operation process (see FIG. 15) of a second embodiment described later.

  Next, the operation process of the drum type washing / drying machine according to the first embodiment will be described. FIG. 8 is a process diagram illustrating an operation process of a washing operation (washing-rinsing-dehydration) in the drum type washing / drying machine according to the first embodiment. FIG. 9 is a table showing the relationship of the operating parameters of the pre-washing process (step S6), the main washing 1 process (step S7), and the main washing 2 process (step S8) of the drum type washing machine according to the first embodiment. is there.

  In step S <b> 1, the process control unit 112 receives a course selection input for the operation process of the drum type washing and drying machine (course selection). Here, the user opens the door 9, puts the laundry 207 to be washed inside the drum 3, and closes the door 9. And a user selects and inputs the course of a driving process by operating the operation switches 12 and 13. By operating the operation switches 12 and 13, the course of the selected operation process is input to the process control unit 112. The process control unit 112 reads the corresponding operation pattern from the operation pattern database 111 based on the input operation process course, and proceeds to step S2. In the following description, it is assumed that the washing course (washing-rinsing twice-dehydration) is selected.

  In step S2, the process control unit 112 executes a process of detecting the weight (cloth amount) of the laundry put into the drum 3 (cloth amount sensing). Specifically, the process control unit 112 drives the motor M to rotate the drum 3, and the clothing weight calculation unit 114 calculates the weight (cloth amount) of the laundry before pouring water.

  In step S3, the process control unit 112 executes a process of calculating the detergent amount / operation time (determination of detergent amount operation time). Specifically, the process control unit 112 controls the water supply electromagnetic valve 16 (for example, opens the third electromagnetic valve) and supplies water directly to the water supply port 2 a of the outer tub 2. The conductivity measuring unit 115 detects the conductivity (hardness) of the supplied water. Further, the temperature of the supplied water is detected by the sensor T1. Thereafter, the water supply electromagnetic valve 16 is controlled to end the water supply to the outer tub 2.

  The detergent amount / washing time determination unit 116 determines the amount of detergent to be put in and the operation time through map search based on the amount of cloth detected in step S2, the electrical conductivity (hardness) of water, and the temperature of water. Then, the process control unit 112 displays the determined amount of detergent and operating time on the display unit 14. In addition, although it demonstrated as supplying water to the outer tank 2 and detecting the electrical conductivity (hardness) and water temperature of water, it is not restricted to this. For example, the electrical conductivity (hardness) and water temperature of water at the previous operation may be stored in a storage unit (not shown) of the microcomputer 110 and used.

  In step S4, the process control unit 112 executes a detergent charging waiting process (detergent charging waiting process). For example, the process control unit 112 waits for a predetermined time and proceeds to step S5. Note that the process control unit 112 determines that the detergent has been thrown in by step S5 if the detergent throwing unit 7 is closed after being opened by means (not shown) for detecting the opening and closing of the detergent throwing unit 7. The structure which advances may be sufficient.

  In step S5, the process control unit 112 executes a detergent dissolving process (detergent dissolving process). For example, the process control unit 112 controls the water supply electromagnetic valve 16 to supply water to the powder detergent charging chamber 73 and the liquid detergent charging chamber 74 via the water supply pipe P1. The detergent and water in the powder detergent charging chamber 73 and the liquid detergent charging chamber 74 flow from the outlet 50a into the recess of the outer tub 2 through the detergent delivery pipe P3, the bellows pipe P4, the water supply port 2a, and the water supply path 50. When water is supplied to a predetermined amount of water, the process control unit 112 controls the water supply electromagnetic valve 16 (for example, closes the first electromagnetic valve) to stop water supply. Then, the process control unit 112 executes a detergent melting operation (detergent melting operation). Specifically, the process control unit 112 controls the circulation pump 18 to discharge water and detergent sucked from the drain port 21 from the circulation discharge port of the recess. The water and the detergent discharged from the circulation discharge port flow through the dent and go to the drain port 21 to circulate. Thereby, water and a detergent are stirred and a detergent is melt | dissolved in water. When a predetermined time (for example, 10 seconds) elapses, the process control unit 112 stops the circulation pump 18 and proceeds to step S6.

  In step S6, the process control unit 112 executes a pre-cleaning process (pre-cleaning process). Here, the pre-washing step (pre-washing step) is a step of immersing the washing water having a high detergent concentration generated in the detergent dissolving step into the laundry. Detergency is improved by immersing washing water having a high detergent concentration into the laundry.

  Specifically, as shown in FIG. 9, the process control unit 112 controls the motor M10a to rotate the drum 3 at a predetermined rotational speed DR1, and controls the circulation pump 18 to have a predetermined flow rate PF1. Then, washing water having a high concentration of detergent sucked from the drain port 21 is discharged into the drum 3 from a discharge port (not shown) provided in the opening of the outer tub 2, thereby washing the inside of the drum 3. The object 207 is soaked. Note that the water level in the outer tub 2 at the start of the pre-washing process is set to a predetermined water level WL0. In order to obtain washing water having a high detergent concentration, the opening / closing valve of the water storage tank is kept closed, and the washing water is flowed from the outer tank recess to the suction of the circulation pump 18 via the bypass path 218.

  Moreover, the process control part 112 will control the water supply electromagnetic valve 16, and will raise the water level of the wash water in the outer tank 2 if predetermined time passes, after starting a prewash process. And if the water level of the wash water in the outer tub 2 rises to a predetermined water level WL1 (WL0 <WL1), the water supply is stopped, the pre-washing process is terminated, and the process proceeds to step S7.

  When the pre-washing process of step S6 is completed, the process control unit 112 executes the main washing process. As shown in FIG. 9, the main washing process is composed of a main washing process 1 (first main washing process) in step S7 and a main washing process 2 (second main washing process) in step S8.

  In step S7, the process control unit 112 executes one main washing process (one main washing process). Here, in the main washing 1 step, the drum 3 is rotated at 60 (r / min) or more so that the laundry inside the drum 3 is attached to the inner surface of the outer peripheral wall of the drum by centrifugal force and dropped from above the drum 3. Washing water with high detergent concentration by centrifugal force while driving the circulation pump 18 at 2700 (r / min) or more and 4200 (r / min) or less while preventing mechanical force from being generated sometimes. Improves cleaning power by immersing in objects.

  Specifically, as shown in FIG. 9, the process control unit 112 controls the circulation pump 18 to have a predetermined flow rate PF1 (30 L / min or more and 60 L / min or less) and sucks it from the drain port 21. Wash water is discharged into the drum 3 from a discharge port (not shown) provided in the opening of the outer tub 2, and the drum 3 is controlled to a predetermined rotational speed DR1 (for example, 100 r / min) by controlling the motor M10a. , The laundry 207 inside the drum 3 is stuck to the inner surface of the drum outer peripheral wall. In order to stably maintain the circulating flow rate in the present embodiment, the open / close valve 220 of the water storage tank 217 is opened and water is stored in the water storage tank 217, and the amount of water used is ensured without increasing the water level of the outer tub 2. When the predetermined time (T1) elapses, the process control unit 112 ends the main washing 1 process and proceeds to step S8.

  In step S8, the process control unit 112 executes two main washing processes (two main washing processes). Here, in the main washing 2 step, the laundry 207 collected in the lower part of the drum 3 due to the rotation of the drum 3 is lifted and dropped from the upper part in the drum 3, thereby applying mechanical force to the laundry 207. Washing is done to improve detergency.

  Specifically, the process control unit 112 controls the water supply electromagnetic valve 16 to supply water to the outer tub 2 up to a predetermined water level WL2 (WL1 <WL2). Further, the process control unit 112 controls the circulation pump 18 to have a predetermined flow rate PF2 (PF1 ≦ PF2), and the discharge port provided in the opening of the outer tub 2 with the cleaning water sucked from the drain port 21 The drum 3 is discharged from the interior of the drum 3 (not shown), and the drum 3 is rotated at a predetermined rotational speed DR2 (DR1> DR2) by controlling the motor M10a, thereby washing the laundry inside the drum 3 To do. The rotational speed DR2 of the drum 3 at this time is set to an extent that the laundry inside the drum 3 does not stick to the inner surface of the outer peripheral wall of the drum, that is, 60 r / min or less (for example, 40 r / min). When the predetermined time (T2) elapses, the process control unit 112 stops the motor M10a and the circulation pump 18, opens the drain valve V1, and drains the cleaning water in the outer tub 2.

  In step S9, the process control unit 112 performs the first rinsing process (one rinsing process). For example, in the first rinsing step, the process control unit 112 controls the water supply electromagnetic valve 16 and the drain valve V1 to repeat water supply and drainage, and also controls the motor M10a to rotate the drum 3 to turn the circulation pump 18 on. The rinsing water sucked from the drain port 21 is controlled to be discharged into the drum 3 from a discharge port (not shown) provided in the opening of the outer tub 2 to rinse the clothes. And when predetermined time passes, the process control part 112 will stop the motor M10a and the circulation pump 18, open the drain valve V1, and will drain the rinse water in the outer tank 2. FIG.

  In step S10, the process control unit 112 performs the second rinsing process (two rinsing processes). For example, in the second rinsing process, the process control unit 112 closes the drain valve V1 and controls the water supply electromagnetic valve 16 to supply water to the outer tub 2 to a predetermined water level. Further, the process control unit 112 controls the motor M10a to rotate the drum 3 and controls the circulation pump 18 to discharge the rinse water sucked from the drain port 21 at the opening of the outer tub 2 (see FIG. (Not shown) to the inside of the drum 3 to rinse the laundry 207. And when predetermined time passes, the process control part 112 will stop the motor M10a and the circulation pump 18, open the drain valve V1, and will drain the rinse water in the outer tank 2. FIG.

  In step S11, the process control unit 112 executes a dehydration process (dehydration process). Specifically, the process control unit 112 opens the drain valve V1, and controls the motor M10a to rotate the drum 3 at a higher speed than during the main washing process, thereby centrifugally dehydrating the laundry 207. Then, when the predetermined time has elapsed, the process control unit 112 stops the motor M10a, closes the drain valve V1, and ends the washing course (washing-rinsing-dehydration).

  The main wash 2 step (step S8) is performed after the main wash 1 step (step S7). The water level WL2 in the main wash 2 step is higher than the water level WL1 in the main wash 1 step (WL1 <WL2). That is, by increasing the amount of washing water in the outer tub 2, the dirt peeled off from the laundry 207 can be dispersed in the washing water, and the dirt peeled off from the laundry 207 adheres to the laundry 207 again. It is possible to suppress “darkening of laundry” caused by the above. Even when the water levels in the main washing process 1 and the main washing process 2 are the same, by storing the water in the water storage tank 217, it is possible to secure a larger amount of water used than before, so that “darkness of the laundry” is reduced.

  In addition, the rotation speed of the drum 3 in the main washing process 1 is set to 60 (r / min) or more, and the laundry is stuck to the inner surface of the outer peripheral wall of the drum 3, so that the drop impact is suppressed and “the laundry becomes wrinkled”. Can be reduced. In general, a drum-type washing machine drops clothes and knocks, so laundry is more likely to be stiff than a vertical washing machine. However, according to this embodiment, the laundry is much stiffer than before. To be suppressed.

  On the other hand, when the mechanical force is suppressed, the cleaning performance may be deteriorated. On the other hand, the rotation speed of the circulation pump 18 in one main washing process is 2700 (r / min) or more, and the circulation flow rate is higher than that of the conventional drum type washing machine. Thereby, washing water with a high concentration of detergent can be sufficiently infiltrated into the laundry, and dirt is easily removed by the action of a surfactant or the like contained in the detergent. Further, the drum 3 is rotated at a rotational speed of 60 (r / min) or more, and a part of the dirt is removed from the laundry by the fluid force when the washing water passes through the laundry with centrifugal force. The As described above, in the main washing step 1, washing water with a high concentration of detergent penetrates the laundry sufficiently, and the fluid force due to centrifugal force acts. Therefore, even if the time of the main washing step 2 is shortened (mechanical force) The cleaning performance is ensured even if it is made smaller.

  Here, the relationship between the flow rate (circulation flow rate) of the circulation pump 18 and the cleaning performance will be described with reference to FIG. FIG. 10A is a graph showing the relationship between the rotation speed of the circulation pump 18 and the cleaning ratio, and FIG. 10B is a graph showing the relationship between the rotation speed of the circulation pump 18 and the circulation flow rate. Incidentally, the washing ratio is the ratio of the washing degree of the test washing machine to the washing degree of the standard washing machine, and is defined in Japanese Industrial Standard “Performance Measurement Method for Home Electric Washing Machine (JIS C9811)”. That is, the higher the cleaning ratio, the higher the cleaning performance.

  Here, the graph shown by the solid line in FIG. 10A is a graph showing the relationship between the rotational speed of the circulation pump 18 used in the drum type washer / dryer according to this embodiment and the cleaning ratio, and FIG. The value indicated by the broken line in a) indicates the value of the cleaning ratio (cleaning ratio = 1.08) in the operation process of the conventional drum type washing machine. Moreover, the graph shown with the continuous line of FIG.10 (b) is a graph which shows the relationship between the rotational speed of the circulation pump 18 used for the drum type washing-drying machine which concerns on this embodiment, and a circulation flow rate. ) Is a graph showing the relationship between the rotational speed of the circulation pump used in the conventional drum type washing machine and the washing / drying machine and the circulation flow rate. As shown in FIG. 10 (b), the circulation pump 18 used in the drum type washing machine according to the present embodiment has the same rotational speed as the circulation flow rate of the circulation pump used in the conventional drum type washing machine. A circulation pump that can flow a large circulation flow is used. As shown in FIG. 10A, the cleaning ratio (cleaning performance) is improved as the circulating pump rotational speed is increased (the circulating flow rate is increased). A washing ratio (washing performance) of about 1.08 equivalent to that of a conventional drum type washing machine and a washing / drying machine can be obtained at a circulating pump rotational speed of about 2700 (r / min). Further, the increase in the cleaning ratio (cleaning performance) is moderated around the circulation pump rotational speed 4200 (r / min).

  Therefore, it is desirable that the circulating pump rotational speed be 2700 (r / min) or more and 4200 (r / min) or less. When the circulating pump rotational speed is less than 2700 (r / min), the cleaning ratio (cleaning performance) is lower than that of a conventional drum type washing machine, which is not preferable. Even if the circulating pump rotational speed is made higher than 4200 (r / min), the cleaning ratio (cleaning performance) is only slightly increased, but the power consumption increases, which is not preferable. 10B, in other words, the circulation flow rate of the circulation pump 18 is desirably 30 (L / min) or more and 60 (L / min) or less.

  In the present embodiment, each washing process is divided into the pre-washing process S6, the main washing 1 process S7, and the main washing 2 process S8. However, the main washing 1 process S7 is regarded as a part of the pre-washing process. Also good. Further, unlike the present embodiment, the drum may be swung by rotating at a low speed in one main washing process, and the operation may be performed in which the drum is stuck at a high speed in two main washing processes. In this case, since the laundry falls at a low water level in one main washing process (compared to the two main washing processes), the tapping washing effect is increased.

  Furthermore, not only in the washing process but also in the rinsing process, the amount of water used may be increased by using the water storage tank 217, and the circulation pump 18 may be operated at a high speed so that the circulation flow rate is 30 (L / min) or more. Thereby, the rinsing performance can be improved, and the time of the rinsing process can be shortened.

  As described above, according to the operation process of the drum-type washing and drying machine according to the first embodiment, darkening and wrinkling of the laundry can be significantly suppressed. The operational effects will be described in detail.

  Generally, since a vertical washing machine has an opening of a tub on the upper surface side, it can be washed by pool washing at a high water level, and the laundry is less likely to be stiff. However, since the opening of the drum type washing machine is on the front side, it is very difficult to increase the water level while preventing water leakage. Therefore, in this embodiment, the circulation flow rate is greatly increased, and plenty of washing water is included in the laundry, so that the washing power can be secured even if the tapping time is shortened. It becomes possible to reduce.

  Next, the effect of suppressing darkening will be described. Blackening occurs mainly because a part of the dirt removed from the laundry adheres to the laundry again. The drum type washing machine is characterized in that it uses less water than the vertical washing machine. However, if the amount of dirt on the laundry and the washing power are the same, the density of the washing water dirt is higher in the drum-type washing machine, and thus it tends to darken.

  Moreover, according to our study, when the washing time of the drum type washing machine and the vertical type washing machine is substantially the same, the drum type washing machine often darkens more than the difference in water amount. This is considered to be caused by a difference in washing method. In the case of a vertical washing machine, washing is performed with the laundry submerged in the washing water, whereas in the drum-type washing machine, the laundry is lifted from the water into the air by rotating the drum and dropped onto the water surface. Repeat the washing process. Hydrophobic dirt removed from the laundry tends to collect on the water surface. This dirt reattaches to the laundry as it leaves and enters the water surface and darkening proceeds.

  In the drum type washing machine of this embodiment, since the circulation flow rate of the wash water is large, a large amount of wash water is sprayed on the laundry that has come out in the air. For this reason, the laundry falls into the water in a state where it is covered with a film of washing water, so that dirt on the water surface is difficult to reattach, and there is an effect of suppressing darkening. Furthermore, as described above, since there is an effect of increasing the cleaning power, darkening can be further suppressed by shortening the washing process.

  Further, in this embodiment, a water-saving washing course can be selected for washing that is desired to save water with laundry other than white goods and thin patterns that are darkened and towels that are worried about wrinkles. In this case, even in the main washing process, the on-off valve 220 is closed, and the operation in which the water storage tank 217 is not used in the main washing process is performed, whereby the amount of water used in the entire washing can be suppressed. Here, the circulation flow rate of the water-saving washing course is set in advance within a range of 15 to 20 (L / min), which is similar to that of conventional washing.

  When the user selects a large-flow washing course instead of the normal water-saving washing course, the tapping time in the main washing process can be shortened, and wrinkles can be reduced. Further, in the case of the large flow rate washing course, the rotation speed of the circulation pump 18 is increased and the circulation flow rate is increased compared to the case of the water saving washing course, so that the cleaning power is improved and the overall operation time is also increased. Can be shortened. As a result, in the case of a large-flow washing course, dirt is difficult to adhere again and darkening can be reduced.

  In addition, at the end of washing, by opening the on-off valve 220 and driving the fan 20 for blowing air, the water storage tank 217 and the bypass passage 218 can be blown and dried, thereby suppressing the generation of odors and mold. be able to.

  FIG. 11 relates to a second embodiment of the present invention, in which (a) is a schematic perspective view of the periphery of the circulation pump 18 from the bottom of the outer tub 2 as seen from the right front side of the drum-type washer / dryer. ) Is a cross-sectional view seen from the bottom. In the present embodiment, a switching valve A 223 is provided in a connecting pipe from the branching portion 219 to the water storage tank 217 inlet, and a switching valve B 224 is provided in the junction 221 between the water storage tank 217 outlet and the bypass path 218. The switching valve A 223 switches between the connection pipe 234 and the water storage tank 217 and the connection between the communication pipe 235 from the outer tank 2 and the water storage tank 217. The change-over valve B224 includes three types of bypass path 218 and waste thread filter communication pipe 236, storage tank 217 and waste thread filter communication pipe 236, bypass path 218 and storage tank 217, and waste thread filter communication pipe 236 (all path connection). The connection is switched. FIG. 12 is a table showing the relationship of operation parameters during the washing process of this example. Since it is basically the same as the configuration of the operation process of the first embodiment shown in FIG. 9, different points will be mainly described. In the pre-washing process after the detergent-melting process, the washing water (corresponding to the water level WL0) created in the detergent-melting process is sprinkled into the drum 3 from a shower (not shown) provided in the upper part of the outer tub 2 so that the washing water is Let the laundry 207 soak up dirt. At this time, the switching valve A223 is connected to the communication pipe 235 from the outer tub 2 and the water storage tank 217, and the switching valve B224 is connected to the bypass path 218 and the waste thread filter communication pipe 236. That is, the wash water flows from the bottom of the outer tub 2 through the bypass path 218 to the suction side of the circulation pump 18. At this time, the water storage tank 217 communicates with the outer tub 2 via the communication pipe 235 from the outer tub 2. Next, in the main washing 1 step, the switching valve A 223 is on the connection pipe 234 and the water storage tank 217 side, and the switching valve B 224 is on the entire path connection side of the bypass path 218, the water storage tank 217 and the lint filter communication pipe 236. This step is the same as the main washing step 1 of the first embodiment. Water is supplied to make the water level WL1, and the circulation amount of the circulation pump 18 is set to PF1, so that the dirt is completely separated from the laundry 207. Before and after the main washing step 1, the conductivity measuring unit 115 measures the conductivity EC1 of the washing water. When measuring the conductivity, it is desirable that the water supply to the outer tub 2 by the water supply electromagnetic valve 16, the circulation by the circulation pump 18, and the rotation of the drum 3 by the motor M10a are stopped. The turbidity determination unit 117 determines whether or not the difference in the conductivity EC1 measured before and after the main washing process is equal to or greater than the threshold value stored in the threshold value storage unit 118. If not (lower than the threshold value), proceed to the following two main washing steps. In the main washing step 2 in this embodiment, after the water stored in the water storage tank 217 is pumped into the outer tub 2, the switching valve A223 and the switching valve B224 are switched to the same switching state as in the prewashing step, so that the water storage tank 217 is used. Circulate without. Specifically, when pumping up the water stored in the water storage tank 217, the switching valve A223 is connected to the connection pipe 235 from the outer tub 2 and the water storage tank 217, and the switching valve B224 is connected to the water storage tank 217 and the waste thread filter communication pipe 236. Switch. If the circulation pump 18 is driven in this state, the water stored in the water storage tank 217 can be sucked and transferred to the outer tub 2 side. As described above, by raising the water level of the outer tub 2 without supplying water, the water head on the suction side of the circulation pump 18 can be secured, and the circulation flow rate can be increased to PF3. Further, the water level of the outer tub 2 can be secured to WL3, and at the rotational speed DR3 of the drum 3, tapping washing (preventing stickiness) can be performed while suppressing a drop. By setting it as a structure and an operation process like a present Example, darkening and wrinkle can be prevented, saving water. It is particularly suitable when there is relatively little dirt or when there are few clothes as laundry. If the turbidity determination value at the end of the main washing process is high, it is determined that there is a lot of dirt, and it is preferable to perform the same operation as in the main washing two process shown in the first embodiment.

  FIG. 13 relates to the third embodiment of the present invention, and shows a schematic perspective view around the circulation pump 18 from the bottom of the outer tub 2. In this embodiment, the water storage tank 217 is in contact with the outside of the outer tub 2, and a water storage tank water supply pipe 237 that can supply water to the water storage tank 217 is provided. FIG. 14 is a perspective view showing the inside of the bottom of the water storage tank 217, and FIG. 15 is a rear view showing the internal cross-sectional structure of the bottom of the water storage tank 217. A flow path switching box 225 is housed inside the water supply tank 217. The switching box 225 has four water outlets, one is a drain hole communication port 230 that communicates with the drain hole 21 of the outer tank 2, one is a water storage tank outlet 231 that communicates with the outside of the water storage tank 217, and one is A tank inflow port 226 through which water can flow from the flow path switching box 225 to the water storage tank 217, one is a flow path switching box communication port 227 that flows into the flow path switching box 225 from the water storage tank 217. The flow path switching box 225 is provided with a movable partition plate 228 and a fixed partition plate 229 that switch the connection of the four water passages.

  14 and 15 also show the flow path switching state. (A) in the drawing shows a state in which the movable partition plate 228 is arranged so as to be perpendicular to the central axis of the drum 3. In this state, the tank inlet 226 and the flow path switching box communication port 227 are shown. Is closed by the movable partition plate 228. On the other hand, the drain hole communication port 230 and the water storage tank outlet 231 communicate with each other through a gap between the inner wall of the flow path switching box 225 and the movable partition plate 228. That is, the flow path switching box 225 serves as the bypass path 218 of the first embodiment, and the states of FIG. 14A and FIG. 15A correspond to the flow path state of the pre-washing process of the first embodiment. . On the other hand, FIGS. 14B and 15B show a state in which the movable partition plate 228 is arranged so as to be parallel to the central axis of the drum 3, and in this state, the drain hole communication port 230, the tank inlet side 226, the flow path switching box communication port 227, and the water storage tank outlet 231 side are divided by the movable partition plate 228 and the fixed partition plate 229. That is, the outer tub 2 and the water storage tank 217 are in communication with each other via the flow path switching box 225. In other words, the states of FIGS. 14B and 15B are equivalent to the flow path states of the main washing 1 step and the main washing 2 step of the first embodiment. Therefore, by adopting the configuration of the present embodiment, it is possible to ensure an operation comparable to that of the first embodiment. Further, at the time of dehydration, when the movable partition plate 228 is switched to the state shown in FIG. 14A and FIG. 15A and the water is supplied to the water storage tank 217 from the water storage tank water supply pipe 237 and stored, It is possible to play a role of a damping weight that suppresses vibration. That is, when the drum is rotated at a high speed of 100 revolutions per minute or more during dehydration, the shake of the outer tub can be kept small by increasing the weight of the outer tub. Thereby, the acceleration time at the time of dehydration start-up can be shortened, noise due to vibration and vibration to the floor during high-speed rotation can be suppressed, and smoothing at the time of dehydration can be achieved. If the mechanical impact on the laundry 207 at the time of dehydration can be alleviated, the wrinkle can be greatly improved. The drainage by dehydration is discharged from the outer tank drain 21 through the flow path switching box 225 and the water storage tank outlet 231.

  FIG. 16 shows a perspective view of a modified example of the water storage tank 217 according to the present invention. In this embodiment, a flow from the tank inlet 238 toward the tank center and a flow from the tank center side toward the tank outlet 239 are provided on the inner wall of the storage tank 217 to which the tank inlet 238 and the tank outlet 239 are attached. It is configured to have an inclination so that it flows smoothly without stagnation. By setting it as such a structure, the waste_water | drain from the water storage tank 217 and the drying in the tank by ventilation can be performed more smoothly.

1 Housing 2 Outer tank 2
3 Drum 4 Conductivity detection means 18 Circulation pump 21 Drain port 100 Control device (operation control means)
V1 Drain valve 207 Laundry 217 Water storage tank 218 Bypass path 219 Branching part 220 On-off valve 221 Junction part 222 Waste thread filter 241 Piping A
242 Piping B

Claims (5)

An outer tank capable of storing liquid inside,
A drum that is rotatably supported in the outer tub and in which laundry is stored;
A drum motor for rotating the drum;
Water supply means for supplying water into the outer tub;
A circulation pump for sucking water from the outer tub and circulating the water into the drum;
In the drum type washing machine comprising the drum motor, the water supply means and the operation control means for controlling the circulation pump,
A water storage tank is provided in the middle of the piping path from the bottom of the outer tank to the circulation pump,
A first washing operation in which water is circulated by the circulation pump without passing through the water storage tank;
A second washing operation in which water is circulated by the circulation pump through the water storage tank;
A drum type washing machine, wherein a rotation speed of the circulation pump in the second washing operation is higher than a rotation speed of the circulation pump in the first washing operation. In claim 1,
The drum type washing machine, wherein the second washing operation is performed after the first washing operation. In claim 1,
A drum-type washing machine characterized in that one of a course for performing the first washing operation and a course for performing the second washing operation can be selected. In any one of Claims 1 thru | or 3,
The second washing operation includes a step of increasing the rotational speed of the drum above 60 r / min and a step of decreasing the rotational speed of the drum below 60 r / min. In any one of Claims 1 thru | or 4,
The drum-type washing machine, wherein a rotation speed of the circulation pump in the second washing operation is set to 2700 r / min or more and 4200 r / min or less.