JP6063335B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum type washing machine.

Conventionally, by connecting a water outlet and a water return port provided in a water tank (outer tank) containing a rotating tank (inner tank) with a water channel, and driving a circulation pump provided in the middle of this water channel, A drum-type washing and drying machine that performs washing while circulating the stored washing water is known (see, for example, Patent Document 1).
In this drum type washing and drying machine, when washing the laundry put into the rotating tub, the washing water once drawn out of the tub from the water outlet is again discharged into the tub through the water return port. When washing, the washing water is applied to the laundry in the rotating tub. Thereby, in this drum type washing and drying machine, the washing effect of the laundry is enhanced by allowing the washing water to efficiently penetrate and penetrate the clothes in the water tank.

JP 2009-55999 A

  However, in the drum type washing machine in which the rotation axis of the rotating tub is inclined, the amount of stored water is reduced due to the structural reasons compared to the vertical type washing machine in which the rotation axis of the rotating tub is oriented in the vertical direction. Therefore, in a conventional drum-type washing machine (see, for example, Patent Document 1), if the washing time is increased to increase the cleaning effect with a small amount of stored water (if the contact time between the washing water and the laundry before washing is increased) The dirt such as sebum once washed out in the washing water may return to the laundry again. In particular, white and thin-patterned clothing and the like have a problem of gradually darkening when the number of times of washing in such a drum type washing machine is repeated. Therefore, there is a demand for a drum-type washing machine with excellent cleaning performance that can prevent darkening even if the number of washings is repeated on the laundry.

  Then, the subject of this invention is providing the drum type washing machine from which the washing | cleaning performance with respect to a laundry improves further conventionally.

  In the drum type washing machine, even if the amount of washing water stored in the outer tub is the same as that of the conventional case, the laundry washing is performed by setting the circulation flow rate of the washing water in the outer tub to a predetermined value or more. The present invention has been reached by finding that the performance is further improved.

That is, the drum type washing machine of the present invention which has solved the above problems, an outer tub for storing washing water, and the inner tub is the washing and dewatering tank that provided rotatably in the outer tub, the inner tank A drive unit that rotates and a circulation mechanism that circulates the washing water stored in the outer tub, the circulation mechanism including a circulation channel that extends from the bottom of the outer tub to the upper part of the outer tub, and the circulation provided in the middle of the flow path includes a circulation pump Ru Tei, the inner diameter of the pipe which connects the circulating pump and the bottom of the outer tub, the inner diameter of the pipe connecting the upper portion of the outer tub and the circulating pump greater than the circulation flow rates of circulating the washing water reserved in the outer tub by the circulation mechanism is characterized in that equal to or greater than 50L / min.

  According to the drum type washing machine of the present invention, it is possible to provide a drum type washing machine in which the washing performance for laundry is further improved as compared with the conventional one.

It is an external appearance perspective view which shows the drum type washing-drying machine of embodiment of this invention. It is a side view which removes the side plate of the housing | casing of the drum type washing-drying machine of FIG. 1, and shows the internal structure roughly. (A) is III-III sectional drawing of FIG. 1, and explanatory drawing of the hollow part formed in the bottom part of an outer tub, (b) is formed in the bottom part of the outer tub in the conventional drum type washing-drying machine. It is explanatory drawing of a hollow part. (A) is a top view which shows the circulation flow path which goes to the circulation pump from the bottom part of the outer tub in the drum type washing / drying machine of FIG. 1, (b) circulates from the bottom part of the outer tub in the conventional drum type washing / drying machine. It is a top view which shows the circulation flow path which goes to a pump. It is a perspective view which shows the circulation pump and circulation flow path of the drum type washing-drying machine of FIG. (A) is a perspective view which shows the bellows hose which connects a circulation pump and the circulation flow path provided in an outer tank cover, (b) is a perspective view which shows the circulation flow path provided in an outer tank cover. It is a partial expansion perspective view of the nozzle vicinity connected to the circulation flow path of an outer tank cover. It is a flowchart which shows a part of control process which the control apparatus of the drum type washing-drying machine of FIG. 1 performs. It is a flowchart which shows a part of other control processing which the control apparatus of the drum type washing-drying machine of FIG. 1 performs. It is a graph showing the relationship between the rotational speed of a circulation pump at the time of washing using the drum type washing-drying machine of the Example of this invention, and a washing | cleaning ratio. It is a graph showing the relationship between the rotational speed of a circulation pump when implementing washing using the drum type washing-drying machine of the Example of this invention, and a circulation flow rate.

Next, the drum type washing and drying machine of the embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
The drum type washing / drying machine of the present embodiment is suitable for washing clothes such as clothes of white and thin patterns, in which washing and rinsing are performed at a normal washing course and a circulation flow rate described later that is larger than the circulation flow rate of the washing course. The high circulation flow rate course can be executed by user selection.

  First, an overall configuration of the drum type washing and drying machine will be described mainly with reference to FIGS. 1 and 2. FIG. 1 is an external perspective view showing a drum type washing / drying machine according to an embodiment of the present invention. FIG. 2 is a side view schematically showing the internal structure of the drum type washing and drying machine of FIG. 1 with the side plate removed. The front-rear, up-down, left-right directions in the following description are based on the front-back, up-down, left-right directions shown in FIG.

  Reference numeral 1 denotes a housing constituting the outer shell. The housing 1 is mounted on a base 1h, and includes left and right side plates 1a and 1b, a front cover 1c, a back cover 1d, a top cover 1e, and a lower front cover 1f. The left and right side plates 1a and 1b are connected by a U-shaped upper reinforcing member 36, a front reinforcing member 37, and a rear reinforcing member (not shown), and form a box-shaped casing 1 including a base 1h. doing.

  Reference numeral 9 denotes a door that closes a slot for loading and unloading the laundry provided in the approximate center of the front cover 1c, and is supported by a hinge 9c provided in the front reinforcing member 37 so as to be opened and closed. When the door opening button 9d is pressed, a lock mechanism (not shown) is released and opened, and when the door 9 is pressed against the front cover 1c, the door is locked and closed. The front reinforcing member 37 has a circular opening for taking in and out the laundry concentrically with an opening of the outer tub 2 described later.

  Reference numeral 6 denotes an operation panel provided at the upper center of the housing 1 and includes a power switch 39, operation buttons 12 and 13, and a display 14. The operation panel 6 is electrically connected to a control device 38 provided at the lower part of the housing 1.

  Reference numeral 19 denotes a detergent container provided on the upper left side in the housing 1, and a drawer-type detergent tray 7 can be mounted from the front opening. When putting detergents, the detergent tray 7 is pulled out as shown by a two-dot chain line in FIG. The detergent container 19 is fixed to the upper reinforcing member 36 of the housing 1. Further, a water outlet 19 a is provided slightly on the left side of the detergent container 19. Therefore, the bottom surface of the detergent container 19 is formed in a mortar shape such that the position of the water outlet 19a is the lowest.

  On the rear side of the detergent container 19, water supply-related parts such as a water supply electromagnetic valve 16, a bath water absorption pump 17, and a water level sensor 34 are provided. A water supply unit 15 is provided in the upper opening of the detergent container 19. The top cover 1e is provided with a water supply hose connection port 16a from a water tap and a water absorption hose connection port 17a for remaining hot water in the bath.

  Reference numeral 3 is a cylindrical washing and dewatering tub (inner tub) that is rotatably supported, and has a large number of through holes (not shown) for water flow and ventilation on its outer peripheral wall and bottom wall. An opening 3a for taking in and out the laundry is provided on the front end face. A fluid balancer (not shown) integrated with the washing and dewatering tub 3 is provided outside the opening 3a. Further, the rotation center axis of the washing and dewatering tub 3 is inclined so that the horizontal or opening side is higher.

  Reference numeral 2 denotes a cylindrical outer tub that encloses the washing and dewatering tub 3 coaxially, the front surface is open, and the motor 4 is attached to the outer center of the rear end surface. The rotating shaft of the motor 4 passes through the outer tub 2 and is connected to the washing and dewatering tub 3. An outer tank cover 2 d that enables water storage in the outer tank 2 is provided at the opening on the front surface. The outer tub 2 is supported by a damper 5 whose lower side is fixed to the base 1h. Reference numeral 10 denotes a rubber bellows, and the outer tub 2 is sealed with water by closing the door 9.

  A water supply port 2 a for supplying water and detergent into the outer tub 2 is provided at the rear side of the outer tub 2. The water supply port 2 a and the water outlet 19 a of the detergent container 19 are connected by a rubber bellows hose 20.

On the bottom side inner peripheral surface of the outer tub 2, a concave recess 2 f is provided so as to extend in the axial direction of the outer tub 2. The bottom surface of the recess 2f is an inclined surface that descends from the front side to the rear side, and a drain port 21 is provided on the rear side of the recess 2f. A bellows hose 22 is connected to the drain port 21 via a joint 21a. A bottom circulating water inlet 18 is provided on the front side of the recess 2f.
Reference numeral 26 denotes a drain hose, one end of which is connected to a water outlet port 23b (see FIG. 4A) of the circulation pump 24 described later, and the other end extends outside the machine. Reference numeral 25 is a drain valve provided in the middle of the drainage hose 26 in the machine.

  FIG. 3A is a cross-sectional view taken along the line III-III in FIG. 1, and is an explanatory view of a recess formed at the bottom of the outer tub. FIG. 3B is a diagram of the outer tub in a conventional drum-type washing and drying machine. It is explanatory drawing of the hollow part formed in a bottom part.

  As shown to Fig.3 (a), the partition W continuous from the internal peripheral surface of the outer peripheral wall of the outer tank 2 is formed in the upper part of the hollow part 2f so that substantially half of the width | variety of the hollow part 2f may be covered. . The partition wall W extends along the outer peripheral surface of the washing / dehydrating tub 3 in a direction opposite to the rotation direction R when the washing / dehydrating tub 3 is dehydrated. The drain port 21 and the inflow port 18 are formed at positions shifted in the rotational direction R of the washing and dewatering tub 3 from the center in the width direction of the recess 2f. As a result, the partition wall W is disposed above the drain port 21 and the inflow port 18.

  The recess 2f is a centrifugal force generated by the rotation of the washing / dehydrating tub 3 during dehydration, and water is discharged from the through hole (not shown) of the washing / dehydrating tub 3 toward the inner peripheral surface of the outer tub 2. The water flowing in the same direction as the rotation direction R of the washing and dewatering tub 3 is received and guided to the drain port 21. The partition wall W exerts an effect of damming the water so that the water that has entered the recess 2f does not return to the outer tub 2 again.

While the volume of the recess 2f of the conventional drum-type washing and drying machine shown in FIG. 3B is about 1 to 1.5 L, the drum-type washing and drying according to this embodiment shown in FIG. The volume of the recess 2f of the machine S is set to be 2.5L or more.
That is, as is clear from the comparison between the recess 2f shown in FIG. 3A and the recess 2f shown in FIG. 3B, the recess 2f in the present embodiment is formed in the circumferential direction of the outer tub 2. Widely formed.

Thereby, the drum type washing / drying machine S has a larger amount of water stored in the outer tub 2 than the conventional drum type washing / drying machine. The washing efficiency of the laundry is further improved as compared with the prior art by expanding the depression 2f together with the increase in the circulation flow rate described later.
In FIG. 3B, reference numeral 2 is an outer tub, reference numeral W is a partition wall, reference numeral 3 is a washing / dehydrating tub, reference numeral R is a rotation direction during dehydration of the washing / dehydrating tub 3, reference numeral 21 is a drain port, reference numeral Reference numeral 18 denotes an inlet.

  4A to be referred to next is a plan view showing a circulation flow path from the bottom of the outer tub to the circulation pump in the drum type washing and drying machine of FIG. 1, and FIG. 4B is a conventional drum type washing and drying method. It is a top view which shows the circulation flow path which goes to a circulation pump from the bottom part of the outer tank in a machine.

  As shown in FIG. 4A, the joint 21 a of the drain port 21 in this embodiment is formed so that the connection portion with the bellows hose 22 protrudes from the drain port 21 toward the left side. One end of the bellows hose 22 is connected to the joint 21 a, and the other end of the bellows hose 22 is connected to the water inlet port 23 a of the circulation pump 24.

  The bellows hose 22 in the present embodiment constitutes a part of the “circulation flow path” in the claims, and the inner diameter of the bellows hose 22 is set to 35 mm or more, preferably about 37 mm to 50 mm. . Incidentally, the inner diameter of the bellows hose 22 is defined by the bellows peak diameter (the inner diameter of the narrow portion of the bellows).

  The length of the bellows hose 22 is set to 400 mm or less, preferably about 150 mm to 300 mm. Incidentally, the length of the bellows hose 22 is defined by the length of the bellows hose 22 extending from the outlet of the joint 21a to the inlet of the water inlet port 23a of the circulation pump 24.

  Incidentally, the joint 21a in the conventional drum type washing and drying machine is formed so as to protrude toward the rear side as shown in FIG. 4 (b). And the length of the conventional bellows hose 22a extended between the coupling 21a and the water inlet port 23a is about 460 mm, and the internal diameter of this conventional bellows hose 22a is about 30 mm.

  4 (a) and 4 (b), reference numeral 23b denotes a water discharge port of the circulation pump 24, and reference numeral 44 denotes a circulation passage 27 (see FIG. 6 (a)) described later on the outer tank cover 2d. Reference numeral 45 is a discharge port for discharging water from the circulation pump 24 into the outer tub 2 (recessed portion 2f).

Returning again to FIG. 2, an air trap 2 e is provided at the lowermost portion of the rear end face of the outer tub 2 and is connected to a water level sensor 34 by a tube 35 to detect the water level in the outer tub 2.
By the way, in the conventional drum type washing and drying machine, the inner diameter of the bellows hose 22a (see FIG. 4B) is narrower than the inner diameter of the bellows hose 22 in the present embodiment (see FIG. 4A). When the circulation flow rate is increased, there is a problem that the pressure of the air trap 2e is lowered and the water level in the outer tub 2 cannot be detected more accurately.

A circulation pump 24, a filter case 23, and a drain valve 25 are provided between the outer tub 2 and the base 1h. The filter case 23 has a cylindrical shape having an opening on the front side, and is equipped with a removable filter (not shown) inside, and collects foreign matters and lint in the washing water. The filter case 23 can be easily attached and detached by opening the door 1g provided on the lower front cover 1f and turning the handle 23d. The filter case 23 is inclined so that the front side becomes higher.
The washing water circulation system centering on the circulation pump 24 will be described in detail later.

  Reference numeral 29 denotes a drying duct, which is arranged inside the back surface of the housing 1. The drying duct 29 is connected to an intake port provided at the rear portion of the outer tub 2 by a rubber bellows hose 29a. A water cooling / dehumidifying mechanism (not shown) is built in the drying duct 29.

  Incidentally, during the drying operation, warm air is blown into the washing and dewatering tub 3 by a heater, a blower fan or the like (not shown), and moisture evaporates from the laundry. The air that has become hot and humid is sucked into the drying duct 29, cooled and dehumidified by the water-cooled dehumidifying mechanism to become low-temperature air, heated by a heater (not shown), and then blown into the washing and dewatering tub 3.

Next, FIG. 5 to be referred is a perspective view showing a circulation pump and a circulation flow path constituting the circulation mechanism of the drum type washing and drying machine of FIG.
The circulation mechanism of the drum type washing and drying machine S according to the present embodiment is mainly configured by the bellows hose 22, the circulation pump 24, the bellows hose 41, and the circulation flow path 27.
As shown in FIG. 5, the circulation pump 24 includes a casing 42 formed integrally with the filter case 23 and a circulation pump motor 47. As described above, the casing 42 is formed with the discharge ports 44 and 45, the water inlet port 23a (see FIG. 4A), and the water outlet port 23b (see FIG. 4A).

The discharge port 44 is connected via a bellows hose 41 to a circulation passage 27 (see FIG. 6B) described later provided on the inner peripheral wall of the outer tank cover 2d.
The bellows hose 41 and the circulation flow path 27 together with the bellows hose 22 (see FIG. 4A), “circulation flow path from the bottom of the outer tank to the upper part of the outer tank” in the claims. Is configured.
The circulation channel 27 is connected to a later-described nozzle 27a (see FIG. 6A) provided on the upper inner side of the outer tank cover 2d.

  The discharge port 45 is connected to the joint 18 a via the bellows hose 40. This joint 18a is provided in the inflow port 18 formed so as to face the recess 2f (see FIG. 3A) at the bottom of the outer tub 2.

  When the circulation pump motor 47 of the circulation pump 24 is rotated forward with the drain valve 25 (see FIG. 2) closed, the washing water in the outer tub 2 passes through the bellows hose 22 from the drain port 21 (see FIG. 3A). As shown, foreign matters are removed by a filter (not shown) in the filter case 23. Thereafter, the washing water enters the circulation pump 24, is discharged from the discharge port 44, and is sent to the circulation flow path 27. From the nozzle 27a (see FIG. 6 (a)) described later, the washing and dewatering tub 3 (see FIG. 2). Water is sprinkled inside.

  When the circulation pump motor 47 of the circulation pump 24 reversely rotates, the washing water in the outer tub 2 passes through the bellows hose 22 from the drain port 21 (see FIG. 3A) and passes through the bellows hose 22 and is filtered by a filter (not shown) in the filter case 23. Foreign matter is removed. Thereafter, the washing water enters the circulation pump 24, is discharged from the discharge port 45, and returns into the outer tub 2 through the bellows hose 40 and the joint 18a.

When the drain valve 25 (see FIG. 2) is opened, the washing water in the outer tub 2 passes through a filter (not shown) in the filter case 23 and is drained from the drain hose 26 to the outside of the machine.
Incidentally, the circulation pump motor 47 in the present embodiment is rotatable at a rotation speed of 380 rpm to 5000 rpm in order to secure a circulation flow rate described later. This rotational speed is controlled by the control device 38 (see FIG. 2) as will be described later.

  Next, FIG. 6A to be referred to is a perspective view showing a bellows hose connecting the circulation pump and a circulation channel provided in the outer tank cover, and FIG. 6B is a circulation channel provided in the outer tank cover. FIG. FIG. 7 is a partially enlarged perspective view of the vicinity of a nozzle connected to a circulation channel provided in the outer tank cover.

As shown in FIGS. 6A and 6B, the bellows hose 41 having one end connected to the discharge port 44 of the circulation pump 24 is connected to the inlet port 2 g of the circulation flow path 27.
As shown in FIG. 6B, the inlet port 2g is formed on the outer peripheral surface of the outer tub cover 2d.

  As shown in FIG. 6A, the circulation flow path 27 in the present embodiment is constituted by a tubular passage integrally formed on the inner peripheral wall of the resin outer tub cover 2d. The circulation flow path 27 is formed along the opening of the outer tank cover 2d, and is connected to a nozzle 27a formed on the upper part of the outer tank cover 2d. The cross-sectional shape of the circulation channel 27 is not particularly limited, and may be a circle, an ellipse, a polygon, or the like. The cross-sectional area of the circulation channel 27 is preferably equivalent to a diameter of 25 mm or more in terms of a circular shape.

  According to the circulation flow path 27 of the present embodiment, since it is provided on the inner peripheral wall of the outer tub cover 2d, it is formed by a conventional polyvinyl chloride pipe or the like provided on the outer peripheral wall of the outer tub cover 2d, for example. Unlikely, the possibility of breakage is further reduced, and even if broken, the washing water does not leak to the outside of the outer tub 2. Moreover, since the circulation flow path 27 is integrally formed with the outer tub cover 2d, the number of parts can be reduced as compared with the conventional one.

The nozzle 27a ejects the washing water discharged from the discharge port 44 of the circulation pump (see FIG. 5) from the upper part of the outer tub cover 2d into the washing and dewatering tub 3 (see FIG. 2).
As shown in FIG. 7, the nozzle 27 a has an opening formed in a slit shape so that washing water can be spread and sprayed in a thin film shape. Further, since the circulation flow rate of the washing water is increased as compared with the conventional case, even if the slit width (gap width) of the nozzle 27a is set wider than the conventional case, the momentum of the injection is not weakened. Therefore, the slit width (gap width) can be set to 3 mm or more, and the blockage of the nozzle 27a due to lint or the like is more reliably prevented.

In addition, a small hole H communicating with the circulation channel 27 is formed in the outer tank cover 2d so as to be adjacent to the nozzle 27a. When the wash water is sprayed from the nozzle 27 a through the circulation channel 27, the wash water is sprayed from the small hole H toward the back side of the bellows 10.
When the washing water sprayed from the small holes H flows from the upper side to the lower side of the bellows 10, the lint attached to the back side of the bellows 10 is washed away.

Next, the control device 38 (see FIG. 2) will be described.
The control device 38 includes a microcomputer, a drive circuit, and the like, and also includes an on / off signal of the operation buttons 12 and 13 shown in FIG. Further, the microcomputer receives various information signals in the operation of the user, the washing process, and the drying process. The microcomputer is connected to the motor 4, the water supply electromagnetic valve 16, the drain valve 25, the blower fan (not shown), and the like via a drive circuit, and controls opening / closing, rotation, and energization thereof. Further, in order to inform the user of information related to the drum type washing and drying machine S, the display 14 and the buzzer (not shown) are also controlled.

FIG. 8 is a flowchart showing a part of a control process executed by the control device of the drum type washing and drying machine of FIG. FIG. 9 is a flowchart showing another part of the control process executed by the control device of the drum type washing and drying machine of FIG.
As shown in FIG. 8, when the power switch 39 (see FIG. 1) is turned on by a user operation, the control device 38 checks the state of the drum type washing and drying machine S and initializes the drum type washing and drying machine S. Is performed (step S101).

  In response to the user's operation of the operation button 13, the control device 38 sets a washing course (step S102). That is, either a normal washing course or a high circulation flow course (white laundry course) in which washing and rinsing are performed at a circulation flow rate larger than the circulation flow rate of this washing course is selected.

The circulation flow rate of a normal washing course is preset within a range of 15 to 20 L / min. The circulation flow rate of the high circulation flow rate course is set to 50 L / min or more. This circulation flow rate can be defined by the circulation flow rate of the washing water flowing through the bellows hose 22 when the washing water is circulated.
Although there is no upper limit of the circulation flow rate, as will be described later, when the flow rate exceeds 60 L / min, there may be cases where the improvement in cleaning performance corresponding to the increase may not be recognized, so the circulation flow rate is set to 50 to 60 L / min. You can also

The circulation flow rate of the “normal washing course” in the present embodiment is maintained within the above range (15 to 20 L / min) when the control device 38 sets the rotation speed of the circulation pump motor 47 to 2300 rpm to 2800 rpm.
Further, the circulation flow rate of the “high circulation flow rate course” is maintained in the above-described range (50 L / min or more) when the control device 38 sets the rotation speed of the circulation pump motor 47 to 3800 rpm to 5000 rpm.

  The setting of the washing course in this embodiment (step S102) assumes only that the setting range of the circulation flow rate is different as described above between the “normal washing course” and the “high circulation flow course”. Therefore, only the case where the “high circulation flow course” is selected will be described below, and the description when the “normal washing course” is selected will be omitted.

  Next, in step S103, the control device 38 monitors the instruction input from the operation button 12 as the start switch of the operation panel 6 and confirms the presence or absence of the start switch signal. If it is not confirmed (in the case of “No” in Step S103), Step S103 is repeated. When the control device 38 confirms the start switch signal (in the case of “Yes” in step S103), the control device 38 proceeds to step S104 and executes the detergent amount detection process.

  This detergent amount detection is performed by increasing the speed from the specified first rotation speed to the specified second rotation speed when the washing and dewatering tub 3 is rotated in one direction in the dry cloth state before supplying the washing water. During this time, the mass of the laundry is detected based on the integrated drive current value of the motor 4. Then, an appropriate amount of detergent to be used (detergent amount) is calculated based on the detected laundry mass, and this detergent amount detection step (step S104) is performed. The amount of detergent is calculated by the control device 38 referring to a comparison table that defines the relationship between the mass of laundry and the amount of detergent used.

  The control device 38 displays the calculated amount of detergent on the display 14 of the operation panel 6 (step S105). When the user puts the displayed detergent amount into the detergent tray 7 and a predetermined time (for example, 1 minute) elapses, the control device 38 opens the water supply electromagnetic valve 16 and sprinkles the detergent tray 7. As a result, the detergent is supplied into the outer tub 2 (step S106).

Next, the control device 38 closes the water supply electromagnetic valve 16 and stops water supply when the water level in the outer tub 2 reaches a preset detergent-dissolved water level (step S107).
And the control apparatus 38 circulates the water in the outer tank 2 through the bellows hose 22 and the bellows hose 40 by rotating the circulation pump motor 47 in the reverse direction. Thereby, the detergent accumulated in the bottom of the outer tub 2 and the recess 2f is dissolved (step S108).

In step S109, pre-washing is executed. In this pre-washing, the washing water in the outer tub 2 is bellows by rotating the circulating pump motor 47 forward and backward while rotating the washing and dewatering tub 3 forward and backward alternately (35 to 45 rotations per minute in the forward and reverse directions). The hose 22, the bellows hose 41, the circulation channel 27, and the nozzle 27 a are applied to the laundry in the washing and dewatering tub 3.
At this time, the control device 38 sets the circulation flow rate of the washing water to 50 L / min or more. This circulating flow rate can also be set to 50-60 L / min for the same reason as described above.

  At this time, the laundry is lifted by a lifter provided on the inner peripheral wall surface of the washing and dewatering tub 3 and repeatedly moves down. Then, the control device 38 intermittently rotates the washing / dehydrating tub 3 and operates the circulation pump 24, while referring to the detection signal of the water level sensor 34 during the stop period of the washing / dehydrating tub 3 and the circulation pump 24. The water supply solenoid valve 16 is opened to supply water so that the water level does not exceed the set water level. This operation is repeated a plurality of times.

  Next, the control apparatus 38 performs a main washing process (step S110). Specifically, the control device 38 rotates the circulation pump 24 forward and forward while rotating the washing and dewatering tub 3 alternately forward and backward alternately (35 to 45 rotations per minute in the forward and reverse directions). In the same manner as described above, the washing water in the outer tub 2 is dropped onto the laundry from the nozzle 27a at the above circulation flow rate. Finally, the control device 38 stops the operation of the circulation pump 24 to stop the circulation of the washing water, and performs the operation of loosening the laundry while rotating the washing and dewatering tub 3 alternately in the forward and reverse directions for a predetermined time. The main washing process (step S110) is terminated.

As shown in FIG. 9, in step S <b> 111 executed subsequent to step S <b> 110 (see FIG. 8), the control device 38 executes the first rinsing.
In this rinsing, the control device 38 first opens the drain valve 25 to drain the water in the outer tub 2. After detecting that the drainage is completed by the water level sensor 34, the control device 38 moves the washing and dewatering tub 3 in one direction (in this embodiment, counterclockwise when viewed from the front (front) of the drum type washing and drying machine S). ) And spin the washing water contained in the laundry.

  Thereafter, the control device 38 opens the water supply electromagnetic valve 16 to supply tap water into the outer tub 2. Next, as in the main washing step (step S110), while rotating the washing and dewatering tub 3 in the reverse direction (from 35 to 45 rotations per minute), the circulation pump motor 47 is rotated forward so that the bottom of the outer tub 2 is placed. The accumulated rinse water is circulated so as to be sprinkled from the nozzle 27a onto the laundry, and the rinse is executed. The circulation flow rate of the rinse water is set to 50 L / min or more in the same manner as the circulation flow rate in the main washing process (step S110). This circulating flow rate can also be set to 50-60 L / min for the same reason as described above.

  Next, the control device 38 detects the water level of the rinse water accumulated at the bottom of the outer tub 2 in a state where the rotation of the washing and dewatering tub 3 and the operation of the circulation pump 24 are stopped, while the water level is detected by the water level sensor 34. Supply water so that it does not exceed.

  Then, while rotating the washing and dewatering tub 3 in reverse (from 35 to 45 rotations per minute), the circulation pump motor 47 is rotated in the forward direction, so that the rinsing water accumulated in the bottom portion (indented portion 2f) of the outer tub 2 is nozzle 27a. Cycle to sprinkle on the laundry and rinse.

  The circulation flow rate of the rinse water is set to 50 L / min or more. This circulating flow rate can also be set to 50-60 L / min for the same reason as described above. Thereafter, in a state where the circulation pump 24 is stopped and the circulation of the rinse water is stopped, the control device 38 rotates the washing and dewatering tub 3 forward and backward in a short cycle to perform a loosening operation.

  In step S112, a rinsing process (second rinsing process) similar to the first rinsing process (step S111) is performed except that the soft finish is put into the outer tub 2.

  In step S113, a dehydration process is performed. The control device 38 rotates the washing and dewatering tub 3 in one direction (in this embodiment, counterclockwise when viewed from the front (front) of the drum type washing and drying machine S) with the drain valve 25 left open. Let the washing water contained in the laundry be centrifugally dehydrated.

  Next, when the drying process (step S114) is executed according to the user's selection, the control device 38 sets the washing and dewatering tub 3 in the same manner as the washing process with the drain valve 25 kept open. Reverse rotation. And the control apparatus 38 sucks out the air in the outer tank 2 in the drying duct 29 by operating the ventilation fan provided in the middle of the drying duct 29.

  The air passing through the drying duct 29 is cooled in contact with the cooling water flowing down from the dehumidifying mechanism installed in the drying duct 29, and then lint and the like accompanying the lint filter are collected. Then, the air is heated by the heater and then blown into the washing / dehydrating tub 3 from the warm air outlet, whereby the laundry in the washing / dehydrating tub 3 is dried. By executing the series of steps as described above, the washing / drying operation step of the drum type washing / drying machine S by the control device 38 is completed.

Next, the effect of the drum type washing machine S according to the present embodiment will be described.
The circulation flow rate of the washing water of the conventional drum type washing and drying machine is generally set to about 15 to 20 L / min. However, in the drum type washing and drying machine S according to the present embodiment, the circulation flow rate is set to 50 L / min or more. The configuration is configurable.

  Specifically, of the circulation pump 24 that connects at least the drain port 21 of the outer tub 2 and the circulation pump 24 so as to draw out the washing water from the outer tub 2 among the pipes that constitute the circulation channel of the washing water. The inner diameter of the bellows hose 22 on the upstream side is set to 35 mm or more, preferably 37 mm to 50 mm, and the length of the bellows hose 22 is set to 400 mm or less, preferably 150 to 300 mm.

And as the circulation pump motor 47 of the circulation pump 24, what can implement | achieve the rotational speed 3000rpm or more, desirably 3800rpm-5000rpm is used.
In addition, the internal diameter of the bellows hose 41 on the downstream side of the circulation pump 24 that feeds the washing water from the circulation pump 24 toward the outer tub cover 2d is set to 20 mm or more, preferably about 25 mm to 35 mm.

  In such a drum-type washing / drying machine S according to the present embodiment, the return of the washing water from the drain port 21 of the outer tub 2 to the circulation pump 24 is improved, so that the circulation flow rate of the washing water is further improved. It becomes. And according to this drum type washing / drying machine S, compared with the conventional drum type washing / drying machine (for example, refer patent document 1), the amount of washing water stored in the outer tub 2 is the same. However, the washing performance for the laundry can be further improved by setting the circulation flow rate of the washing water in the outer tub 2 within the above range. Even if the amount of water stored in the outer tub 2 is the same as that of a conventional drum-type washing / drying machine, this drum-type washing / drying machine S has improved cleaning performance against darkening and the like from the nozzle 27a. By increasing the amount of washing water to be washed, the washing time (contact time between the washing water and the laundry) can be shortened, and dirt such as sebum once washed out in the washing water returns to the laundry again. This is probably because the amount is kept low.

  Further, according to this drum type washing and drying machine S, since the washing time (the contact time between the washing water and the laundry) can be shortened, the movement of the laundry in the washing and dewatering tub 3, specifically, The number of times the laundry is lifted and dropped by the lifter is reduced, and the feeling of stiffness after washing can be suppressed.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.
In the embodiment, it is assumed that the bellows hose 41 has an inner diameter within the predetermined range. However, if the circulation flow rate can be set to 50 L / min or more, the inner diameter of the conventional bellows hose 41 is the same as the conventional one. Things can also be used.
In the above-described embodiment, the bellows hoses 22 and 41 are used. However, the pipes forming these circulation channels are not limited to those having a circular cross section, and various ones such as an ellipse and a polygon are used. be able to. At this time, the pipe having a cross-sectional area that has the inner diameter when converted into a circular one can be used.

  Moreover, in the said embodiment, although the circulation flow path 27 of the outer tank cover 2d assumes what extends over a substantially half circumference along the opening of the outer tank cover 2d from the inlet port 2g, the opening of the outer tank cover 2d is assumed. It may extend over substantially the entire circumference. The circulation channel 27 extends in one direction from the inlet port 2g along the opening of the outer tank cover 2d, but the circulation channel 27 of the outer tank cover 2d is branched from the inlet port 2g in two directions. It can also be set as the structure extended along opening. According to such a branched circulation channel 27, two or more nozzles 27a can be arranged along the opening of the outer tank cover 2d. In this case, each nozzle 27a is desirably provided between the 3 o'clock position and the 9 o'clock position when the upper part of the opening of the outer tank cover 2d is set to the 0 o'clock position.

Next, the present invention will be described more specifically based on examples.
(Example)
In this example, the relationship between the circulation flow rate and the washing ratio of the drum type washer / dryer S shown in FIG. 1 was verified.

The inner diameter of the bellows hose 22 of the drum type washing and drying machine S was 40 mm. The length of the bellows hose 22 was 270 mm. As the cross-sectional area of the circulation channel 27 of the outer tank cover 2d, a cross-sectional area having an inner diameter equivalent to 25 mm when converted into a circular cross section was used. The circulation pump 24 used a blower motor. As the laundry, 4.5 kg of JIS test cloth was used. In addition, the detergent used what melt | dissolved 1.8g in advance with 1 L of water.
And the washing | cleaning ratio when changing the rotational speed of the circulation pump 24 within the range of 3000 rpm-6000 rpm and implementing washing was measured. The result is shown in FIG.

FIG. 10 is a graph showing the relationship between the rotational speed of the circulation pump and the washing ratio when washing is carried out using the drum type washing and drying machine of this embodiment.
“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 specified in the Japanese Industrial Standard “Measuring Method for Household Electric Washing Machine Performance (JISC9811)”. Say things.

Next, the circulation flow rate of the washing water in the bellows hose 22 when the washing was carried out by changing the rotation speed of the circulation pump 24 within the range of 3000 rpm to 6000 rpm in the drum type washing dryer S was measured. The result is shown in FIG.
FIG. 11 is a graph showing the relationship between the rotational speed of the circulation pump and the circulation flow rate when washing is performed using the drum type washing and drying machine of the present embodiment.

  In this drum type washing and drying machine S, as shown in FIG. 10, when the rotational speed of the circulation pump 24 exceeds 4000 rpm, the increase rate of the cleaning ratio becomes abruptly slow, and when the rotational speed exceeds 4500 rpm, the cleaning ratio is improved. Became almost horizontal. As shown in FIG. 11, in the drum type washing and drying machine S, the circulation flow rate in the bellows hose 22 is 50 L / min when the rotation speed of the circulation pump 24 is 4000 rpm, and the bellows hose when the rotation speed is 4500 rpm. The circulation flow rate at 22 was 60 L / min.

That is, as shown in FIG. 11, the drum-type washing / drying machine S increases the circulation flow rate proportionally when the rotational speed of the circulation pump 24 is increased from 3000 rpm to 6000 rpm, whereas the washing ratio is As shown in FIG. 10, the increase rate of the cleaning ratio is rapidly slowed down at 4000 rpm (see FIG. 10).
From the above, it was verified that the drum type washing dryer S exhibits excellent washing performance by setting the circulation flow rate to 50 L / min.

2 Outer tank 2d Outer tank cover 2e Air trap 2f Recessed part 2g Inlet port 3 Washing and dewatering tank (inner tank)
18 inlet 18a joint 19a outlet 20 bellows hose 21 drain outlet 21a joint 22 bellows hose 23a inlet port 23b outlet port 24 circulation pump 25 drain valve 27 circulation channel 27a nozzle 29a bellows hose 34 water level sensor 38 control device 40 bellows hose 41 Bellows hose 42 Casing 44 Discharge port 45 Discharge port 47 Circulation pump motor S Drum type washer / dryer

Claims (6)

An outer tub for storing washing water;
And the inner tub is the washing and dewatering tank that provided rotatably in the outer tub,
A driving device for rotationally driving the inner tank;
A circulation mechanism for circulating the wash water stored in the outer tub;
With
The circulation mechanism is a circulation flow path from the bottom of the outer tub to the top of the outer tub,
Provided in the middle of the circulation passage comprises a circulation pump Ru Tei, a,
The inner diameter of the pipe connecting the bottom of the outer tank and the circulation pump is larger than the inner diameter of the pipe connecting the circulation pump and the upper part of the outer tank,
Drum type washing machine, characterized in that the circulation flow rates of circulating the washing water reserved in the outer tub is equal to or greater than 50L / min by the circulation mechanism. In the drum type washing machine according to claim 1,
A drum type washing machine, wherein an inner diameter of a pipe connecting the bottom of the outer tub and the circulation pump is set to 35 mm or more. In the drum type washing machine according to claim 1,
A drum type washing machine, wherein an inner diameter of a pipe connecting the circulation pump and an upper part of the outer tub is set to 20 mm or more. In the drum type washing machine according to any one of claims 1 to 3,
A drum type washing machine, wherein a length of a pipe connecting the bottom of the outer tub and the circulation pump is set to 400 mm or less. In the drum type washing machine according to any one of claims 1 to 4,
Among the circulation channels from the bottom of the outer tub to the upper portion of the outer tub, the circulation channel from the circulation pump to the upper portion of the outer tub is formed on the inner peripheral wall of the outer tub cover attached to the opening of the outer tub. A drum-type washing machine comprising a channel formed integrally. In the drum type washing machine according to any one of claims 1 to 5,
A slit-like nozzle for injecting washing water into the inner tub is provided at the tip of the circulation channel leading to the upper part of the outer tub, and the slit gap width of this nozzle is set to 3 mm or more. Drum-type washing machine characterized by

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