TWI544122B - Drum washing machine - Google Patents

Description

Drum washing machine

The present invention relates to a drum type washing machine.

The drum type washing machine is such that the rotating shaft of the drum is substantially horizontal, or the opening of the drum is inclined obliquely upward to tilt the rotating shaft, and after the clothes are put into the drum, the washing process, the rinsing process, and the dehydrating process are performed. The washing process and the rinsing process are a turning action of rotating the drum at a low speed to wind up the clothes stagnated under the drum and then falling from above the drum. By this turning action, the machine is given a mechanical force for cleaning and rinsing. In the dehydration step, the drum is rotated at a high speed, whereby the centrifugal dewatering is performed to press the moisture out of the clothes.

Further, during the cleaning process, the washing water in the washing tank (outer tank) is sucked into the clothes by the circulation pump. Thereby, the washing water dissolved in the lotion is completely infiltrated into the clothes. As described above, the drum type washing machine can save water while ensuring the cleaning performance as compared with the vertical type washing machine.

Patent Document 1 discloses a drum type washing machine including: a water tank that can store water; a water-permeable hole and a rotation-equipped a rotary groove in the water tank; a circulation water passage that communicates with the water intake port and the water return port of the water tank outside the water tank; a circulation pump provided in a middle portion of the circulation water passage; and the circulation water passage and the circulation pump The water in the water tank is circulated through the circulation water passage by the pump of the circulation pump, and is discharged from the water inlet port to the water tank to circulate (see the first item of the patent application).

[Previous Technical Literature]

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-55999

However, the drum type washing machine in which the rotating shaft of the rotary groove is inclined is smaller in water storage amount than the vertical washing machine in which the rotating shaft of the rotary groove is perpendicular to the structure. Therefore, the conventional drum type washing machine (for example, refer to Patent Document 1), when the washing time is increased by increasing the washing effect with a small amount of water storage (when the contact time of the washing water and the laundry is increased until the washing is completed), once cleaning Contaminants such as sebum washed out by water may return to the laundry again. Further, in particular, white matter or light-colored clothes and the like may become black due to the number of repeated washings of the above-described drum type washing machine.

On the other hand, the inventors of the present invention have found that the circulation flow rate of the washing water from the bottom of the outer tank to the upper portion of the outer tank is set to a predetermined value or more, thereby preventing the laundry from becoming black.

However, it is necessary to further increase the circulation flow rate to improve the cleaning performance of the drum type washing machine than the conventional one having a high output circulating pump motor. Further, the above drum type washing machine has a new problem of causing electric corrosion in the bearing in accordance with the high output of the circulation pump motor.

Accordingly, an object of the present invention is to provide a drum type washing machine which can further improve cleaning performance and prevent electric corrosion of a bearing of a circulation pump motor.

The drum type washing machine of the present invention, which solves the above problems, includes an outer tank for storing water therein, a drum that rotatably supports the outer tank, and accommodates clothes, a drum motor that rotationally drives the drum, and a water supply into the outer tank. a water supply means; and a drum type washing machine for sucking water from the outer tank so that water circulates toward the circulation pump in the drum, wherein the circulation pump has a direction from the outer tank toward the water in the drum An impeller that rotates water in the drum and a circulation pump motor that rotates the impeller sets a circulating flow rate of water of the circulation pump when the water is sprayed into the drum at 35 L/min or more. The circulation pump motor is provided. An electrical insulation mechanism that prevents the shaft current of the rotating shaft of the circulating pump motor.

According to the present invention, it is possible to provide a drum type washing machine which is capable of further improving the washing performance and preventing the electric corrosion of the bearing of the circulating pump motor.

2‧‧‧ outer trough

3‧‧‧Roller

4‧‧‧Roller motor

23‧‧‧Filter box

24‧‧‧Circulating pump

27‧‧‧Circular flow path

42‧‧‧ pump casing

42a‧‧‧1st housing

42b‧‧‧2nd housing

42c‧‧‧ inserted perforation

46‧‧‧ Impeller

47‧‧‧Circulating pump motor

48‧‧‧ shaft

49‧‧‧ bearing

49a‧‧‧ Inner wheel

49b‧‧‧Outside

49c‧‧‧ rolling elements

50a‧‧‧Rotor

50b‧‧‧stator

51‧‧‧ motor box

60‧‧‧Electrical insulation mechanism

100‧‧‧Drum type washing and drying machine

Fig. 1 is a perspective view showing the appearance of a drum type washing and drying machine (tray type washing machine) according to an embodiment of the present invention.

Fig. 2 is a side view schematically showing the internal structure of the casing of the drum type washing machine (drum type washing machine) of Fig. 1 .

Fig. 3(a) is a cross-sectional view taken along line III-III of Fig. 2, an explanatory view of a depressed portion formed at the bottom of the outer groove, and Fig. 3(b) is a view of a conventional drum type washing and drying machine (drum type washing machine) An explanatory view of the depressed portion at the bottom of the outer groove.

Fig. 4(a) is a top view showing a circulation flow path from the bottom of the outer tub of the drum type washing and drying machine (drawing type washing machine) of Fig. 1 toward the circulation pump, and Fig. 4(b) is a view showing the conventional drum. The top of the outer tank bottom of the type laundry dryer (drum type washing machine) faces the circulation flow path of the circulation pump.

Figure 5 is a partial enlargement of the circulation pump and filter box of Figure 4(a) Figure.

Fig. 6 is a sectional view taken along line VI-VI of Fig. 5.

Fig. 7 is a perspective view showing a circulation pump and a circulation flow path of the drum type washing and drying machine (drum type washing machine) of Fig. 1.

Fig. 8(a) is a perspective view showing a circulation flow path provided in the outer tank casing, and Fig. 8(b) is a perspective view showing the bellows pipe connected to the circulation pump and the circulation flow path provided in the outer tank casing.

Fig. 9 is a partially enlarged perspective view showing the vicinity of the nozzle of the circulation flow path connected to the outer tank casing.

Fig. 10 is a process chart for explaining an operation procedure of the laundry operation of the drum type washing and drying machine (drum type washing machine) according to the first embodiment.

Fig. 11(a) is a graph showing the relationship between the circulation flow rate of the circulation pump and the washing ratio, and Fig. 11(b) is a graph showing the relationship between the number of revolutions of the circulation pump and the circulation flow rate.

Fig. 12 is a graph showing the relationship between the circulation flow rate of the circulation pump and the amount of change in the brightness of the clothing.

Next, the drum type washing and drying machine (drum type washing machine) of the present embodiment will be described in detail below with reference to appropriate drawings. The drum type laundry dryer of the present embodiment is for suppressing the stiffness of the clothes after washing, thereby reducing the mechanical force applied to the clothes. The washing performance is lowered, and the circulating flow rate of the washing water is greatly increased to maintain good cleaning performance. Further, the drum type laundry dryer of the present embodiment is an electric insulating mechanism which is formed to greatly increase the circulating flow rate of the washing water, and has a circulating current motor having a high output and a shaft current for preventing the rotating shaft of the circulating pump motor. Set in the configuration of the circulation pump motor.

First, the overall configuration of the drum type laundry dryer will be mainly described with reference to Figs. 1 and 2 . Fig. 1 is a perspective view showing the appearance of a drum type laundry dryer of the present embodiment. Fig. 2 is a side view schematically showing the internal structure of the frame of the drum type washing and drying machine of Fig. 1 . The directions of the front, back, left, and right directions described below are based on the directions of the front, rear, left, and right, and left and right in Fig. 1 .

Reference numeral 1 is a frame constituting an outer contour of the drum type laundry dryer 100. The casing 1 is attached to the base 1h, and is composed of left and right side plates 1a and 1b, a front casing 1c, a rear casing 1d (see Fig. 2), an upper casing 1e, and a lower casing 1f. The left and right side plates 1a and 1b are combined with an inverted U-shaped upper reinforcing member 36 (see Fig. 2), a front reinforcing member 37 (see Fig. 2), and a rear reinforcing member (not shown), and the base 1h is formed into a case. Type frame 1.

Reference numeral 9 denotes a door that closes the input port for taking out the clothes to be placed in the center of the front casing 1c, and the hinge 9c (see Fig. 2) provided in the front reinforcing member 37 can be supported to be openable and closable. Push The shutter open key 9d is opened after the latch mechanism is removed, and the door 9 is pressed and locked toward the front housing 1c to be closed. The front reinforcing material 37 is concentric with the opening of the outer tub 2 (see FIG. 2) to be described later, and has a circular opening for taking out the garment.

Reference numeral 6 is an operation panel provided at the center of the upper portion of the casing 1, and includes a power switch 39, operation keys 12 and 13, and a display 14. The operation panel 6 is electrically connected to a control device 38 (see FIG. 2) provided at a lower portion of the casing 1.

Reference numeral 19 (see Fig. 2) is a lotion container provided on the upper left side in the casing 1, and a pull-out type detergent tray 7 is provided from the front opening. When the lotion is placed, the lottery tray 7 is pulled out as indicated by the two dotted lines in Fig. 1 . The lotion container 19 (see Fig. 2) is an upper reinforcing member 36 fixed to the casing 1 (see Fig. 2). Further, a water outlet 19a is provided substantially at the rear side of the left side surface of the lotion container 19 (see Fig. 2). Therefore, the bottom surface of the lotion container 19 is the grinding dome shape in which the position at which the nozzle 19a is formed is the lowest.

On the rear side of the lotion container 19, a water supply solenoid valve 16, a bath water suction pump 17 (see Fig. 2), a water level sensor 34 (see Fig. 2), and the like are provided with water supply related components. The water supply unit 15 is provided in the upper opening of the lotion container 19 (see Fig. 2). The upper casing 1e is provided with a water supply hose connection port 16a from the faucet and a water suction hose connection port 17a from the remaining water of the bathtub.

As shown in Figure 2, the drum as a washing and dewatering tank 3 is a cylindrical shape and is rotatably supported. The drum 3 has a plurality of through holes (not shown) for water passage and ventilation on the outer wall and the bottom wall, and an opening portion 3a for taking out the clothes is provided on the front end surface. The outer side of the opening 3a is provided with a fluid balancer (not shown) integrated with the drum 3. Further, the central axis of rotation of the drum 3 is horizontal or inclined so that the opening side is higher.

Reference numeral 2 is a cylindrical outer groove, and the drum 3 is wrapped in a coaxial shape, opened at the front, and a drum motor 4 is attached to the outer center of the rear end surface. The drum 3 is rotated by the drum motor 4 in the forward and reverse directions. The rotating shaft of the drum motor 4 is coupled to the drum 3 through the outer tub 2. An outer tank casing 2d for storing water in the outer tank 2 is provided in the front opening. The outer tank 2 is supported by the damper 5 fixed to the base 1h on the lower side. Reference numeral 10 is a bellows made of rubber, and the closing door 9 seals the outer tank 2 with water.

A water supply port 2a for supplying water and a lotion to the outer tank 2 is provided at the rear side of the side surface of the outer tub 2. The water supply port 2a and the water outlet 19a of the lotion container 19 are connected by a rubber bellows tube 20.

A concave recessed portion 2f extending in the axial direction of the outward groove 2 is provided in the inner peripheral surface of the bottom side of the outer tub 2. The bottom surface of the recessed portion 2f is formed with an inclined surface downward from the front side toward the rear side, and the drain side 21 is provided on the rear side of the recessed portion 2f. A bellows tube 22 is connected to the drain port 21 through the joint 21a. The front side of the recessed portion 2f is provided with an inflow port 18 for circulating water at the bottom.

Reference numeral 26 is a drain hose, which is a circulation pump 24 to be described later. The water outlet 23b (see Figure 4(a)) is connected to one end, and the other end side extends out of the machine. Reference numeral 25 is a drain valve provided in the middle of the drain hose 26 extending in the machine.

Fig. 3(a) is a sectional view taken along line III-III of Fig. 2, an explanatory view of a depressed portion formed at the bottom of the outer groove, and Fig. 3(b) is a bottom portion of the outer groove formed in the conventional drum type washing and drying machine. An illustration of the depressed portion.

As shown in Fig. 3(a), a partition wall W continuous from the inner peripheral surface of the outer wall of the outer tub 2 is formed on the upper portion of the recessed portion 2f so as to cover substantially half the width of the recessed portion 2f. The partition wall W extends along the outer peripheral surface of the drum 3 in a direction opposite to the rotational direction R when the drum 3 is dehydrated. The drain port 21 and the inflow port 18 are formed at positions shifted from the center in the width direction of the recess portion 2f toward the rotation direction R of the drum 3. Thereby, the partition wall W is disposed in the upper portion of the drain port 21 and the inflow port 18.

When the recessed portion 2f is discharged by the centrifugal force generated by the rotation of the drum 3 during the dehydration, when the water is discharged from the through hole (not shown) of the drum 3 toward the inner peripheral surface side of the outer tub 2, the rotation direction R against the drum 3 is prevented. Water flowing in the same direction is introduced into the drain port 21. The partition wall W can exert an effect of stopping the stagnation of the water entering the recessed portion 2f from returning to the outer tub 2.

The volume of the depressed portion 2f of the conventional drum type laundry dryer is about 1-1.5 L with respect to the third (b), and the third is set. (a) The drawing shows that the volume of the recessed portion 2f of the drum type laundry dryer 100 according to the present embodiment is 2.5 L or more.

In other words, it is clear from the comparison between the depressed portion 2f shown in Fig. 3(a) and the depressed portion 2f shown in Fig. 3(b) that the depressed portion 2f of the present embodiment is formed wide in the circumferential direction of the outer groove 2. Width. The recessed portion 2f may be set to have a width of 35% or more of the inner diameter of the outer tub 2.

Thereby, the drum type laundry dryer 100 increases the water storage amount of the outer tub 2 as compared with the conventional drum type washer dryer. By the expansion of the recessed portion 2f, the number of revolutions of the circulation pump to be described later can be increased, and a large amount of washing water can be sucked into the circulation pump to increase the circulation flow rate. As a result, the washing effect of the clothes can be improved more conventionally.

4(a) is a top view showing a circulation flow path from the bottom of the outer tank of the drum type washing and drying machine of Fig. 1 toward the circulation pump, and Fig. 4(b) is a view showing the conventional drum type laundry. The top view of the outer tank bottom of the dryer faces the circulation flow path of the circulation pump.

As shown in Fig. 4(a), the joint portion of the joint 21a of the drain port 21 of the present embodiment and the bellows tube 22 is formed to protrude from the drain port 21 toward the left side. Further, one end of the bellows 22 is connected to the joint 21a, and the other end of the bellows 22 is connected to the water inlet 23a of the circulation pump 24.

The bellows tube 22 of the present embodiment is a part of the circulation flow path, and the inner diameter of the bellows tube 22 is 35 mm or more, and is set. It is preferably around 37~50mm. Incidentally, the inner diameter of the bellows 22 is defined by the mountain diameter of the bellows (the inner diameter of the narrow portion of the bellows).

Further, the length of the bellows tube 22 is 400 mm or less, and it is preferably set to about 150 to 300 mm. Incidentally, the length of the bellows 22 is defined by the length of the bellows tube 22 extending from the outlet of the joint 21a to the inlet of the inlet bowl 23a of the circulation pump 24.

As described above, in the present embodiment, since the bellows tube 22 is connected to the outlet of the joint 21a from the side of the circulation pump 24 in the lateral direction, the length from the joint 21a to the inlet of the water inlet port 23a of the circulation pump 24 can be shortened, and the length can be reduced. Small flow path resistance. Further, the inner diameter of the bellows tube 22 located on the upstream side of the circulation pump 24 is 35 mm or more larger than usual, and the flow path resistance can also be reduced at this point. Therefore, although it will be described later in detail, the large-flow washing water can be sucked in by the increase in the number of revolutions of the circulation pump 24, and can be circulated in the drum 3.

Further, the joint 21a of the conventional drum type laundry dryer is formed as shown in Fig. 4(b) and protrudes toward the rear side. Further, the length of the conventional bellows tube 22a extending between the joint 21a and the water inlet bowl 23a is about 460 mm, and the inner diameter of the conventional bellows tube 22a is about 30 mm.

In the fourth (a) and (b), reference numeral 23b denotes a water discharge port of the circulation pump 24, and reference numeral 44 denotes a circulation flow path 27 (see Fig. 8(a)) which will be described later, which faces the outer tank casing 2d. Spit 埠, symbol 45 is to send water from the circulation pump 24 into the outer tank 2 (recessed portion 2f) Spit out.

Returning to Fig. 2, an anti-gas valve 2e is provided at the lowermost portion of the rear end surface of the outer tub 2. A hole 2e1 communicating with the outer tub 2 (recessed portion 2f) is provided at a lower portion of the air trap 2e, and an upper portion of the air trap 2e and the water level sensor 34 are connected by a tube 35, and the water level in the outer tub 2 is detected. Incidentally, the conventional drum type laundry dryer is provided with an air trap 2e above the rear portion of the drain port 21. The circulating water flows from the drain port 21 through the air trap 2e to the bellows tube 22a (see Fig. 4(b)). Since the inner diameter of the bellows tube 22a is narrower than the inner diameter of the bellows tube 22 (see Fig. 4(a)) of the present embodiment, the flow rate of the lower portion of the hole 2e1 of the air trap 2e becomes large as the circulation flow rate increases. According to Bernoulli's theorem, there is a problem that the pressure in the anti-gas valve 2e is lowered and the water level in the outer tank 2 cannot be correctly detected. In the present embodiment, the circulating water flows from the drain port 21 to the left side (see Fig. 4(a)), and the flow velocity of the communicating hole 2e1 portion can be reduced, and the water level in the outer tub 2 can be accurately detected.

A circulation pump 24, a filter box 23, and a drain valve 25 are provided between the outer tank 2 and the base 1h. The filter case 23 has a cylindrical shape having an opening on the front side, and a detachable filter (not shown) is attached inside to collect foreign matter or shavings in the washing water. The filter box 23 is provided with a door 1g provided in the lower front casing 1f, and the rotating handle 23d can easily disengage the filter (not shown). The filter box 23 is inclined at a higher front side.

The circulation of the washing water centered on the circulation pump 24 is detailed later. Detailed description.

Reference numeral 29 is a drying duct which is disposed inside the back surface of the casing 1. The drying duct 29 is connected to an air inlet provided at the rear of the outer tank 2 by a rubber bellows tube 29a. A water-cooling dehumidification mechanism (not shown) is provided in the drying line 29.

Incidentally, during the drying operation, hot air is blown into the drum 3 by a heater, a fan or the like (not shown) to evaporate water from the clothes. The air that has become hot and humid is sucked into the drying duct 29, and is cooled and dehumidified by the water-cooling and dehumidifying means to become low-temperature air, and is heated by a heater (not shown) and then blown into the drum 3. Further, a heat pump may be used instead of the heater or the water-cooling dehumidification mechanism.

Next, Fig. 5 is a partial enlarged view of the circulation pump and the filter box of Fig. 4(a). Fig. 6 is a sectional view taken along line VI-VI of Fig. 5.

The circulation pump 24 of the present embodiment is a centrifugal pump. As shown in Fig. 5, the circulation pump 24 includes a pump casing 42, an impeller (also referred to as a rotor) 46, and a circulation pump motor 47.

The pump casing 42 is configured to include a first casing 42a that is integrally formed with the filter casing 23 and a second casing 42b that is coupled to the first casing 42a.

The first casing 42a is formed of a substantially cylindrical body, and an impeller 46 is disposed inside the first casing 42a.

Inhalation crucible 43, discharge spout 44, and spit are formed in the first casing 42a. Exit 45, water inlet 23a and water outlet 23b.

The suction port 43 is a substantially circular through hole that connects the filter case 23 and the first case 42a, and is formed coaxially with the impeller 46 of the circulation pump 24.

The circulation pump 24 passes the washing water that has entered the first casing 42a through the suction port 43, and corresponds to the rotation direction of the impeller 46 attached to the rotating shaft 48 (see FIG. 6) of the circulation pump motor 47, and faces the discharge ports 44 and 45. One of them spit out.

The impeller 46 is shown as a left rotation (hereinafter referred to as a positive rotation) from the front side (the side of the suction port 43 in Fig. 5), and the washing water is sent to the circulation pump path 27 to be described later through the discharge port 44 (see Fig. 8(a) ). More specifically, when the impeller 46 is rotating, the washing water flowing in from the suction weir 43 is pushed out toward the inner peripheral wall of the first casing 42a by the pumping action of the centrifugal force of the impeller 46. In addition, the washing water rotates leftward in the first casing 42a, and flows, and the partition wall (not shown) in which the inner peripheral wall of the first casing 42a and the impeller 46 are narrowed in a radial direction collides and changes the flow direction. Spit out 埠44 out.

When the impeller 46 rotates to the right (hereinafter, referred to as reverse rotation), the inner peripheral wall of the first casing 42a collides with a partition wall (not shown) in which the radial gap of the impeller 46 is narrowed to change the flow direction, so that the washing is performed. Water flows out of the spit. As described above, by changing the rotation direction of the circulation pump 24, the discharge direction of the circulation pump 24 can be changed without using a special flow path switching mechanism.

Fig. 6 is a sectional view taken along line VI-VI of Fig. 5.

As shown in Fig. 6, the second casing 42b is formed of a substantially cylindrical body having a diameter larger than that of the first casing 42a. The second casing 42b is disposed such that its bottom side faces the first casing 42a. The second casing 42b is provided between the first casing 42a and the circulation pump motor 47, whereby the impeller 46 is disposed in a watertight manner inside the first casing 42a. In Fig. 6, reference numeral S1 denotes an O-ring between the first casing 42a and the second casing 42b in a watertight manner.

Further, at the bottom center of the second casing 42b, an insertion hole 42c through which the rotation shaft 48 of the circulation pump motor 47 described later is inserted is formed. In Fig. 6, reference numeral S2 denotes a sealing material that is watertightly inserted through the rotating shaft 48 of the insertion hole 42c and the second casing 42b. In Fig. 6, reference numeral 23 is a filter box, reference numeral 23a is a water inlet port of the circulation pump 24, reference numeral 23b is a water discharge port of the circulation pump 24, and reference numeral 23c is a filter.

The circulation pump motor 47 is shown in Fig. 6. The motor casing 51 mainly includes a rotor 50a provided around the rotating shaft 48 and a stator 50b provided on the outer peripheral side of the rotor 50a. The circulation pump motor 47 of the present embodiment is a brushless motor, and the rotation shaft 48 is rotatable in both the forward rotation and the reverse rotation.

The motor case 51 is formed by connecting the opening sides of the pair of bottomed cylinders 51a and 51b.

The rotation shaft 48 is disposed to pass through the center shaft of the motor case 51, and the one end side on which the impeller 46 is attached protrudes outward from the inner side of the motor case 51.

Incidentally, the diameter of the rotating shaft 48 that protrudes toward the outside of the motor case 51 is formed to be smaller than the diameter of the rotating shaft 48 disposed inside the motor case 51. Further, a portion of the shaft 48 having a small diameter penetrates the insertion hole 42c of the second casing 42b through the seal member S2, and the impeller 46 as described above is attached to the tip end portion thereof.

The bearing 49 is provided with a pair of supportable rotating shafts 48 at the center of the bottom of the bottomed cylinders 51a, 51b forming the motor case 51, respectively.

The bearing 49 of the present embodiment is a rolling bearing, and includes an inner ring 49a, an outer ring 49b, and a plurality of rolling elements 49c assembled between the inner ring 49a and the outer ring 49b.

Further, the circulation pump motor 47 of the present embodiment is configured to be capable of rotating at a number of revolutions of 2,300 to 4,200 rpm in order to secure a predetermined circulation flow rate to be described later. Further, the output of the circulation pump motor 47 is preferably 30 W or more, and more preferably 100 W or more.

However, the circulation pump motor 47 of the present embodiment uses a motor having a larger output than the circulation pump motor used in the conventional drum type washing machine (see, for example, Patent Document 1) as described above. Thereby, a potential of several V is formed on the rotating shaft 48 by the excitation corresponding to the increase in the electrostatic capacity of the rotor 50a and the stator 50b. That is, a circulating current that circulates the rotating shaft 48, the bearing 49, and the motor case 51 is formed, and a shaft current is generated in the rotating shaft 48. As a result, a discharge is generated inside the bearing 49 supporting the rotating shaft 48, which causes electrical corrosion in the bearing 49.

In contrast to the circulation pump motor 47 of the present invention An electrical insulation mechanism 60 for preventing the generation of shaft current from the shaft 48. Specifically, the electrical insulating mechanism 60 is configured to have a rotating shaft 48 that is subjected to electrical insulation treatment. Here, the "rotating shaft after the electric insulating treatment" means a coating film having an insulating property at least on the surface of the rotating shaft 48 that is in contact with the bearing 49, but the rotating shaft 48 itself is formed of an insulating material, and A coupling portion made of an insulating material is provided on the way of the rotating shaft 48 extending between the bearings 49, 49. Further, examples of the material and the insulating material of the insulating coating film include hard ceramics such as CrN, TiN, TiAlN, TiCN, TiC, WC/C, and AlTiC. Incidentally, an insulating coating film made of these materials can be formed by a sputtering method or the like.

The above electrical insulating mechanism 60 electrically cuts off the flow of the circulating current to prevent the generation of the shaft current of the rotating shaft 48. Therefore, the drum type laundry dryer 100 can prevent the electric corrosion of the bearing 49 of the circulation pump motor 47.

Further, although the electric insulating mechanism 60 of the present embodiment is configured to have the rotating shaft 48 subjected to the electrical insulating treatment as described above, the present invention is not limited thereto as long as the generation of the shaft current of the rotating shaft 48 can be prevented.

That is, although not shown, the electrical insulating mechanism may be constituted by a bearing 49 having a rolling element 49c subjected to electrical insulation treatment. Here, the "rolling element after the electric insulating treatment is applied" means a coating film having an insulating property on the surface of the rolling element 49c, but includes The rolling elements 49c themselves are formed of an insulating material. Examples of the material of the insulating coating film and the insulating material include the above-described hard ceramics.

Further, although not shown, the electric insulating mechanism may be constituted by a bearing 49 to which at least one of the inner ring 49a and the outer ring 49b is subjected to electrical insulation treatment.

Further, although not shown, the electric insulating mechanism may be constituted by a motor case 51 in which the bottom cylinders 51a and 51a are connected to each other via an annular insulating material.

Fig. 7 is a perspective view showing a circulation pump and a circulation flow path of a circulation mechanism of the drum type washing and drying machine of Fig. 1.

As shown in Fig. 7, the discharge port 44 is connected to the circulation flow path 27 (see Fig. 8(a)), which will be described later, through the bellows tube 41 and the inner peripheral wall of the outer tank case 2d. Further, the bellows tube 41 and the circulation flow path 27 constitute a circulation flow path from the bottom of the outer tank 2 to the upper portion of the outer tank 2 together with the bellows tube 22. The circulation flow path 27 is connected to a later-described nozzle 27a (see Fig. 8(a)) provided inside the outer tank casing 2d.

The spout 45 is connected to the joint 18a through the bellows 40. The joint 18a is provided at an inflow port 18 formed by a recessed portion 2f (see Fig. 3(a)) adjacent to the bottom of the outer tub 2.

When the circulation pump 25 of the circulation pump 24 is rotated while the drain valve 25 (see Fig. 2) is closed, the outer circulation is external. The washing water in the tank 2 is passed through the bellows 22 from the drain port 21 (see Fig. 3(a)), and the foreign matter is removed by a filter (not shown) in the filter box 23. Thereafter, the washing water enters the pump casing 42 (arrow F in Fig. 5) from the above-described suction port 43 (see Fig. 5), and is discharged from the discharge port 44. Then, the washing water is sent to the circulation flow path 27 shown in Fig. 8(a) as described above, and water is sprinkled from the nozzle 27a toward the drum 3 (see Fig. 2).

When the circulation pump motor 47 of the circulation pump 24 is reversely rotated, the washing water in the outer tank 2 passes through the bellows 22 from the drain port 21 (see Fig. 3(a)), and the filter in the filter box 23 (not shown) Remove foreign matter. Thereafter, the washing water enters the pump casing 42 from the above-described suction port 43 (see Fig. 5), is discharged from the discharge port 45, and is returned to the outer tub 2 through the bellows pipe 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 box 23, and is drained from the drain pipe 26 to the outside of the machine.

Next, referenced to Fig. 8(a) is a perspective view showing a circulation flow path provided in the outer tank casing, and Fig. 8(b) is a view showing the bellows pipe connected to the circulation pump and the circulation flow path provided in the outer tank casing. perspective.

As shown in Figs. 8(a) and 8(b), the bellows tube 41 whose one end is connected to the discharge port 44 of the circulation pump 24 is the inlet port 2g that connects the other end thereof to the circulation flow path 27. The entrance 埠 2g is like the first 8(b) shows a peripheral surface formed on the outer tank casing 2d.

The circulation flow path 27 of the present embodiment is constituted by a tubular passage integrally formed on the inner peripheral wall of the groove case 2d made of resin, as shown in Fig. 8(a). The circulation flow path 27 is formed along the opening of the outer tank casing 2d, and is connected to the nozzle 27a formed in the upper portion of the outer tank casing 2d. The cross-sectional shape of the circulation flow path 27 is not particularly limited, and may be a circular shape, an elliptical shape, a polygonal shape or the like. The cross-sectional area of the circulation flow path 27 is preferably a circular shape equivalent to a diameter of 25 mm or more.

Since the circulation flow path 27 of the present embodiment is provided on the inner peripheral wall of the outer tank casing 2d, it is different from the conventionally formed vinyl chloride pipe or the like provided on the outer peripheral wall of the outer tank casing 2d, and is damaged. The possibility is reduced, and even in the event of breakage, the washing water does not leak out to the outside of the outer tank 2. Further, since the circulation flow path 27 is integrally formed with the outer tank case 2d, the number of components which are less conventional can be used.

The nozzle 27a is for ejecting the washing water discharged from the discharge port 44 of the circulation pump 24 from the upper portion of the outer tank casing 2d toward the drum 3 (see Fig. 2).

Fig. 9 is a partially enlarged perspective view showing the vicinity of the nozzle which is connected to the circulation flow path provided in the outer tank casing.

As shown in Fig. 9, the nozzle 27a has its opening formed into a slit shape, and the washing water can be expanded into a film shape, and water can be sprayed toward a wide range in the drum 3 (see Fig. 2). Also, due to the circulating flow of washing water Since the gap width (gap width) of the nozzle 27a is wider than in the past, the force of the ejection is not weakened. Therefore, the slit width (gap width) can be set to 3 mm or more, and the clogging of the nozzle 27a due to shavings or the like can be surely prevented.

Further, the outer tank casing 2d may be formed adjacent to the nozzle 27a and communicate with the circulation flow path 27 (see Fig. 8(a)). When the washing water is sprayed from the nozzle 27a through the circulation flow path 27, the washing water is sprayed from the small hole H toward the inside of the bellows 10. When the washing water sprayed from the small hole H flows from the upper portion to the lower portion inside the bellows 10, the dust or the like adhering to the inner side of the bellows 10 can be discharged.

Next, it is explained with respect to the control device 38 (refer FIG. 2).

The control device 38 includes a microcomputer, a drive circuit, and the like, and includes switching signals of the operation keys 12 and 13 shown in FIG. 1 and input circuits of output signals from various sensors. Moreover, the microcomputer is a variety of information signals that receive the user's operation, washing steps, and drying steps through the driving circuit. The microcomputer is connected to the drum motor 4, the water supply solenoid valve 16 (see Fig. 1), the drain valve 25, and the blower fan (not shown) shown in Fig. 2 through a drive circuit, and controls the switches, rotation, and energization. . Moreover, in order to notify the user of the information related to the drum type washing and drying machine 100, the display 14 (refer FIG. 14), a buzzer (not shown), etc. are also controlled.

Next, an example of the operation steps of the drum type washing and drying machine will be described with reference to the respective symbols shown in Figs. 1 and 2 as appropriate.

Fig. 10 is a process chart for explaining an operation procedure of the washing operation (washing to washing-dehydration) of the drum type laundry dryer according to the embodiment.

In step S1, the control device 38 is an input (stroke selection) that accepts the stroke selection of the operation procedure of the drum type laundry dryer 100. Here, the user opens the door 9, puts the washed clothes into the inside of the drum 3, and closes the door 9. Further, the user selects the input of the operation step and the input by the operation of the operation keys 12 and 13. The stroke of the selected operation step is input to the control device 38 by the operation of the operation keys 12, 13. The control device 38 reads the corresponding operation mode from the operation mode database based on the stroke of the input operation step, and proceeds to step S2. In the following description, the standard stroke (washing - washing twice - dehydrating) will be described.

In step S2, the control device 38 performs a step (measurement of the cloth amount) for detecting the weight (the amount of cloth) of the clothes put into the drum 3. Specifically, the control device 38 drives the drum motor 4 to rotate the drum 3, and the clothing weight calculating unit calculates the weight (amount of cloth) of the clothes before the water is injected.

In step S3, the control device 38 executes a step of calculating the washing amount and the running time (calculating the washing amount operation time). in particular, The control device 38 controls the water supply solenoid valve 16 to directly supply water to the water supply port 2a of the outer tub 2. The conductivity measuring unit of the control device 38 detects the conductivity (hardness) of the water after the water supply through the electrical conductivity sensor (not shown) disposed at the bottom of the outer tank 2. The temperature of the water after the water supply is detected by a sensor. Thereafter, the water supply solenoid valve 16 is controlled to end the supply of water to the outer tank 2.

The washing amount and washing time determining unit of the control device 38 determines the amount of washing and the running time to be input by image search based on the amount of cloth detected in step S2, the conductivity (hardness) of water, and the temperature of water. Further, the control device 38 displays the determined washing dose and running time on the display 14. Further, the water supply to the outer tank 2 has been described as the conductivity (hardness) and water temperature of the test water, but it is not limited thereto. For example, the conductivity (hardness) and water temperature of the water during the previous operation may be stored in advance in a storage unit (not shown) of the microcomputer.

In step S4, the control device 38 executes a lotion input waiting step (a lotion input waiting step). For example, after the control device 38 stands by for a predetermined time, it proceeds to step S5. The user refers to the washing dose displayed on the display 14 during standby, and puts the lotion into the detergent tray 7. Further, the control device 38 may take the means of detecting the switch of the detergent disk 7 (not shown), and when it is turned off after the lotion tray 7 is opened, the washing agent is used as the configuration to proceed to step S5.

In step S5, the control device 38 performs a lotion dissolution step (a lotion dissolution step). For example, the control device 38 controls the water supply The solenoid valve 16 is supplied to the powder detergent injection chamber and the liquid detergent supply chamber through the water supply pipe. The lotion and water in the powder lotion input chamber and the liquid lotion input chamber are through the lotion delivery tube, the bellows tube 20, the water supply port 2a located at the upper portion of the rear side of the outer tank 2, and the inner surface of the bottom wall of the outer tank 2 The water supply path flows from the outlet thereof to the recessed portion 2f of the outer tub 2.

When the water is supplied to the predetermined amount of water, the control device 38 controls the water supply solenoid valve 16 to stop the water supply. Further, the control device 38 performs a lotion dissolution operation (lotion dissolution operation). Specifically, the control device 38 controls the circulation pump 24, and the water and the lotion which are permeated through the bellows tube 22 from the drain port 21 are discharged through the bellows tube 40 from the inflow port 18 of the recessed portion 2f.

The water and the lotion discharged from the inflow port 18 flow through the recessed portion 2f and form a circulation toward the drain port 21. Thereby, the water and the lotion are stirred, and the lotion is dissolved in water. When a predetermined time (for example, 10 seconds) elapses, the control device 38 stops the circulation pump 24 and proceeds to step S6.

In step S6, the control device 38 performs a rotary water supply step (rotary water supply step). Specifically, the control device 38 controls the water supply solenoid valve 16 to raise the water level of the wash water in the outer tank 2. Further, the control device 38 controls the drum motor 4 to rotate the drum 3 at a predetermined number of revolutions (for example, 40 rpm) to perform alternate rolling of the clothes. Moreover, the control device 38 controls the circulation pump 24 to have a predetermined number of rotations (for example, 3000 rpm), and discharges the washing water having a high concentration of the lotion sucked by the drain port 21 from the nozzle 27a provided in the opening of the outer tub 2 to the drum. The inside of the 3, thereby incorporating the clothing inside the drum 3.

Further, when the water level of the washing water in the outer tank 2 rises to a predetermined water level, the water supply is stopped. The start of the rotary water supply step ends the rotary water supply step when the predetermined time elapses, and proceeds to step S7.

In step S7, the control device 38 performs a pre-washing agitation step, wherein the pre-washing agitation step is a step of dissolving the washing water having a high concentration of the lotion generated by the dissolving the lotion step into the clothes. The washing power is improved by dissolving the washing water having a high concentration of the lotion into the clothes.

Specifically, the control device 38 controls the circulation pump 24 to have a predetermined number of rotations (for example, 3000 rpm), and the washing water sucked from the drain port 21 is discharged into the drum 3 by the nozzle 27a provided in the opening of the outer tub 2, and The drum motor 4 is controlled to rotate at a predetermined rotation speed (for example, 80 rpm), whereby the clothes inside the drum 3 are attached to the inner surface of the peripheral wall of the drum by centrifugal force, and the mechanical force generated when the drum is dropped from above the drum is prevented.

Further, when the cylindrical surface of the outer tub 2 (for example, the cylindrical surface on the right side of the outer tub 2) is provided with a water overflow port (not shown) for abnormal overflow, the drum 3 is rotated forward to prevent the washing water from being used for abnormal overflow. It is desirable that the drain port (not shown) flows out. In the present embodiment, the drum 3 is rotated in the forward direction, but it may be rotated in the opposite direction or in both the forward and reverse directions. When a predetermined time (for example, a 5-minute period) elapses, the control device 38 ends the pre-washing agitation step and proceeds to the step. S8.

In step S8, the control unit 38 performs a formal washing and agitating step. Here, the main washing step is a step of winding up the clothes that have been stagnated in the drum 3 by the rotation of the drum 3, and dropping them from above the drum 3, thereby imparting a mechanical washing force to the clothing.

Specifically, the control device 38 controls the circulation pump 24 to have a predetermined flow rate (for example, 3800 rpm), and discharges the washing water sucked by the drain port 21 from the nozzle 27a provided in the opening of the outer tub 2 toward the inside of the drum 3, and controls The drum motor 4 rotates the drum 3 at a predetermined rotation speed (for example, 40 rpm), thereby performing knocking washing of the clothes inside the drum 3. When a predetermined time (for example, a 6 minute period) elapses, the control device 38 ends the formal washing step, and proceeds to step S9.

In step 9, control unit 38 is performing a draining step. The control device 38 stops the drum motor 4 and the circulation pump 24, and opens the drain valve 25 to discharge the washing water in the outer tub 2. The water level sensor 34 continuously monitors the water level of the wash water in the outer tank 2 in the drain. When the detected value of the water level sensor 34 is lower than the predetermined water level, the control device 38 ends the draining step and proceeds to step S10.

In step 10, the control unit 38 is a step of performing dehydration. The control device 38 rotates the drum 3 in the reverse direction at a high speed (for example, 1250 rpm) while maintaining the valve of the drain valve 25 open. Dehydration of the wash water contained in the clothes is carried out. When the predetermined time elapses, the control device 38 ends the dehydration 1 step, and proceeds to step S11.

In step 11, control unit 38 is performing a rotary spraying step. The control device 38 rotates the drum 3 in the reverse direction at a medium speed (for example, 260 rpm), closes the drain valve 25, controls the water supply solenoid valve 16, and sprinkles water toward the clothes. The control time of the water supply solenoid valve 16 at this time is determined based on the amount of cloth detected in step S2. When the scheduled time passes, the water supply is stopped. The circulation pump 24 is controlled to have a predetermined flow rate (for example, 3800 rpm), and the washing water sucked into the drain port 21 is discharged from the nozzle 27a provided in the opening of the outer tub 2 to the inside of the drum 3. When the predetermined time elapses, the circulation pump 24 is stopped, and the drain valve 25 is opened to drain the washing water in the outer tub 2.

In step 12, control unit 38 is the step of performing dehydration. The control device 38 rotates the drum 3 at a high speed in the reverse direction (for example, 1250 rpm) while maintaining the valve of the drain valve 25 open, and performs dehydration of the washing water contained in the clothes. When the predetermined time elapses, the control device 38 ends the dehydration 2 step, and proceeds to step S13.

In step 13, the control device 38 is a water supply step. The control device 38 closes the drain valve 25, controls the water supply solenoid valve 16, and supplies the washing water into the outer tub 2. When the temperature rises to the predetermined water level, the water supply is stopped, and the control device 38 ends the water supply step, and the process proceeds to step S14.

In step 14, the control device 38 is configured to perform a softener supply. Water step. The control device 38 controls the water supply solenoid valve 16, supplies the washing water containing the soft processing agent into the outer tank 2, and rotates the drum 3 in both the forward and reverse directions, and mixes the washing water supplied to the outer tank 2 in step S13. With soft processing agent.

In step 15, the control unit 38 is a step of performing a rotary water supply and make-up water. The control device 38 controls the water supply solenoid valve 16 to supply water to the water tank 2 to a predetermined water level. Moreover, the control device 38 controls the drum motor 4 to rotate the drum 3, controls the rotary pump 24 to have a predetermined flow rate (for example, 3000 rpm), and washes the washing water sucked by the drain port 21 from the nozzle 27a provided in the opening of the outer tank 2 toward the drum. The inside of the 3 is discharged, and the soft processing agent is dissolved in the clothes.

In step 16, control unit 38 is performing a washing and agitating step. The control device 38 controls the drum motor 4 to rotate the drum 3, controls the circulation pump 24 to have a predetermined flow rate (for example, 3800 rpm), and washes the washing water sucked by the drain port 21 from the nozzle 27a provided in the opening of the outer tub 2 toward the drum 3. The inside spits out and cleans the clothes. Then, when the predetermined time elapses, the control device 38 ends the washing and stirring step, and proceeds to step S17.

In step 17, control unit 38 is performing a draining step. The control device 38 stops the drum motor 4 and the circulation pump 24, and opens the drain valve 25 to drain the washing water in the outer tub 2. The water level sensor 34 continuously monitors the water level of the wash water in the outer tank 2 in the drain. When the detected value of the water level sensor 34 is lower than the predetermined water level, the control device is installed. The draining step 38 ends, and the process proceeds to step S18.

In step 18, control unit 38 is performing the dehydration step. Specifically, the control device 38 opens the drain valve 25, controls the drum motor 4, and rotates the drum 3 at a high speed to perform centrifugal dewatering of the clothes. When the predetermined time elapses, the control device 38 stops the drum motor 4, opens the drain valve 25, and ends the washing course (washing-washing-dehydration).

The rotation speed of the drum 3 of the main washing step (S8) is less than 60 rpm. The rotation speed of the drum 3 is set to be less than 60 rpm, whereby the clothes that have stagnated in the lower side of the drum 3 are wound up and subjected to tapping washing from the upper side in the drum 3. The washing performance was obtained by tapping the falling impact (mechanical force) applied to the clothes.

Further, the number of revolutions of the drum 3 in the pre-washing stirring step (S7) is 60 rpm or more. When the number of rotations of the drum 3 is 60 rpm or more, the clothes in the drum 3 can be attached to the wall surface direction of the drum 3 by centrifugal force. In other words, the falling impact (mechanical force) applied when the clothes are dropped from the upper side in the drum 3 can be suppressed, and the "hardening of the clothes" can be suppressed. In general, the drum type dryer is such that the clothes are dropped and subjected to tapping washing. Therefore, the clothes are more likely to be harder than the vertical type washing machine. However, according to the present embodiment, the clothes can be prevented from being hardened by suppressing the falling impact in the pre-washing and stirring step.

On the other hand, due to the suppression of mechanical force, there is a fear that the cleaning performance is lowered. For this, the cycle of the pre-washing agitation step The rotation speed of the pump 24 becomes 2300 rpm or more, so that the circulation flow rate is increased more than the conventional drum type dry washing machine. Thereby, the washing water having a high washing agent concentration can be sufficiently permeated into the clothes, and the dirt can be easily removed from the clothes by the action of the surfactant or the auxiliary agent contained in the lotion. Further, the drum 3 is rotated at a number of revolutions of 60 rpm or more, and the clothes are passed through the washing water of the immersion clothing by the centrifugal force, but a part of the dirt is removed from the fluid force when the clothes are washed by the washing water.

As described above, in the pre-washing and stirring step, the washing water having a high concentration of the lotion is sufficiently saturated into the clothes, and by the action of the fluid force of the centrifugal force, the washing time can be ensured even if the time of the main washing and stirring step is shortened (reducing the mechanical force). performance.

Next, the relationship between the circulation flow rate of the circulation pump 24 and the cleaning performance will be described using Figs. 11(a) and (b).

Fig. 11(a) is a graph showing the relationship between the circulation flow rate of the circulation pump and the washing ratio. Incidentally, the ratio of the cleaning ratio to the degree of cleaning of the test washing machine and the washing degree of the standard washing machine is defined in the Japanese Industrial Standard "Measurement Method for Performance of Electric Washing Machines for Household Appliances (JISC9811)". That is, the higher the washing ratio, the higher the washing performance.

Further, in the eleventh (a)th drawing, the solid line is a graph of the drum type washing and drying machine 100 of the present embodiment, and the broken line indicates a conventional drum type washing and drying machine and the drum type washing and drying machine of the present embodiment. The value of the washing ratio when running at the same stirring time of 100 (washing ratio) =1.11).

Fig. 11(b) is a graph showing the relationship between the number of revolutions of the circulation pump and the circulating flow rate.

Further, in the eleventh (b)th drawing, the solid line is a graph of the drum type washing and drying machine 100 of the present embodiment, and the broken line is a graph of a conventional drum type washing and drying machine as a comparative example. Incidentally, as shown in Fig. 11(b), the drum type laundry dryer 100 according to the present embodiment is a circulation pump which uses a larger maximum circulation flow rate than a conventional drum type laundry dryer.

As shown in Fig. 11(a), the more the circulating flow rate, the higher the washing ratio (cleaning performance). The same washing ratio (cleaning performance) as that of the conventional drum type laundry dryer was obtained in the vicinity of the circulating flow rate of 35 L/min. Further, when the circulating flow rate is around 60 L/min, the washing ratio (washing performance) is increased.

Therefore, the circulation flow rate is preferably 35 L/min or more and 60 L/min or less. When the circulation flow rate is lower than 35 L/min, it is not preferable to wash the conventional drum type laundry dryer. Further, when the circulation flow rate is more than 60 L/min, the increase in the washing ratio is extremely small, but the power consumption of the circulation pump 24 is increased. Therefore, it is not expected to increase the required circulating flow rate or more. In the above-described circulation pump 24 of the present embodiment, the number of revolutions of the circulation pump is 2,300 rpm or more and 3,800 rpm or less.

The rotational speed of the circulation pump 24 may not be frequent in each step The range of the circulating pump rotation speed of 2300 rpm or more and 3800 rpm or less is assumed to mean that the average value of the number of revolutions of the circulation pump 24 in each step is included in this range. For example, in the pre-washing stirring step of step S7 (refer to Fig. 10), even if the number of revolutions of the circulation pump 24 is changed from 2000 rpm to 3400 rpm, the average value may be 2300 rpm or more. Further, when the number of revolutions of the circulation pump 24 is changed, the range of the washing water sprayed from the sprinkler can be changed. Therefore, the wash water can be uniformly dispersed in the clothes.

As described above, according to the operation procedure of the drum-type washer-dryer 100 according to the present embodiment, the circulating flow rate of about 20 L/min can be greatly increased to 35 L/min or more and 60 L/min or less, from the slit-like nozzle toward A wide range of watering of the washing water is carried out in the drum. When the circulation flow rate is large, the cleaning ratio is increased in the state in which the entire washing machine is immersed in the rotation of the drum 3 with sufficient washing water, and the clothes are dropped, and the impact contained in the clothes is dropped from the clothes by the impact of the washing water (knock washing) ).

Further, as shown in Fig. 11, when the circulation flow rate is more than 60 L/min, the increase in the washing ratio is substantially saturated, and the amount of water containing the clothes is limited. Even if the required flow rate is increased, the washing water flows to the outside of the clothes. Helpless to wash. Further, since the entire garment is impregnated with the washing water, the dilution of the lotion component can be effectively performed during the washing, and the washing performance can be improved at the same time.

Generally, the vertical washing machine is in place due to the opening of the groove. Washing is performed on the upper side with high water storage, so it is less likely to be hard. However, it is very difficult to maintain a high water level while preventing the water from leaking on the front side of the drum type laundry dryer. Therefore, in the present embodiment, the circulation flow rate is greatly increased, and sufficient water is contained in the clothing, and the cleaning power can be ensured even when the time of the tapping washing is shortened, and as a result, the hardening of the clothes can be reduced. In other words, the water-saving property of the characteristic of the drum type laundry dryer is not deteriorated, and the washing with less hardness can be realized with high washing power.

Also, blackening is a part of the dirt mainly removed from the clothing due to reattachment to clothing (in the case of contamination). The drum type laundry dryer has a feature of using less water than a vertical type washing machine. However, when the amount of dirt of the clothes is together with the detergency, the concentration of the washing water becomes higher than the concentration of the drum type washing and drying machine, so that it tends to be black. In general, the drum type laundry dryer uses about half the amount of water compared to the vertical type washing machine, and the dirt concentration is about twice. Moreover, the longer the washing time, the more likely it becomes black.

According to the review by the present inventors, when the washing time of the drum type washing and drying machine is substantially the same as that of the vertical type washing machine, the drum type washing and drying machine tends to be black more than the difference in the amount of water (the difference in the concentration of the washing water). This is due to the difference in the washing method. Compared with the vertical washing machine, one type of washing is immersed in the washing water, and the washing of the drum type washing and drying machine is repeated to rotate the clothes in the water from the water to the empty with the rotation of the drum. Medium and fall to the surface. Hydrophobic dirt removed from clothing tends to concentrate on the water surface. The dirt will adhere to the clothing when it enters the water surface, and it will continue to darken.

In the drum type washing and drying machine 100 of the present embodiment, since the circulating flow rate of the washing water is large, a large amount of washing water is sprinkled on the clothes that are taken out to the air. Therefore, the clothes are dropped into the water in a state covered with a film of the washed water, so that the dirt on the water surface is less likely to reattach, and the effect of suppressing blackening is suppressed. Further, as described above, it also has an effect of improving the detergency, and since the time of the washing step is shortened, blackening can be further suppressed.

Fig. 12 is an example of experimental results showing the relationship between the circulation flow rate of the circulation pump and the change in brightness (blackening) of the clothes. In the experiment, washing (coating amount: 3 kg) of clothing and white clothes to which artificial sebum stains or inorganic stains such as carbon were adhered was repeated. Figure 12 shows the data after 5 cycles of washing. The bright change is the value obtained by subtracting the brightness of the new product from the brightness after washing the white clothes. The larger the value, the greater the blackening. As can be seen from Fig. 12, the more the circulating flow rate, the less the brightness changes, and the more difficult it is to turn black. Not only when the cleaning force is considered, but also when the blackening is considered, the circulation flow rate is preferably increased to about 68 L/min (circulation pump rotation speed of 4,200 rpm), and the experimental conditions can almost suppress the occurrence of blackening. In other words, when the desired lower limit value of the circulation flow rate is considered, the circulation flow rate of the water of the circulation pump 24 of the present embodiment is preferably 35 L/min or more and 68 L/min or less.

Further, the circulation pump motor 47 of the present embodiment is rotated at a number of revolutions of 2,300 to 4,200 rpm as described above in order to secure the circulating flow rate. As a result, there is a possibility that the circulation pump motor 47 generates a shaft current. However, in the circulation pump motor 47, the shaft current can be prevented from being generated by the electrical insulation mechanism 60 as described above.

Therefore, the drum type laundry dryer 100 can prevent the electric corrosion of the bearing 49 of the circulation pump motor 47.

Although the present embodiment has been described above, the present invention is not limited to the above embodiment, and various embodiments can be implemented.

In the above embodiment, the drum type washing and drying machine 100 has been described, but the present invention can also be applied to a drum type washing machine which does not have a drying function.

23‧‧‧Filter box

23a‧‧‧Inlet

23b‧‧‧Water outlet

23c‧‧‧ filter

24‧‧‧Circulating pump

42a‧‧‧1st housing

42b‧‧‧2nd housing

42c‧‧‧ inserted perforation

46‧‧‧ Impeller

47‧‧‧Circulating pump motor

48‧‧‧ shaft

49‧‧‧ bearing

49a‧‧‧ Inner wheel

49b‧‧‧Outside

49c‧‧‧ rolling elements

50a‧‧‧Rotor

50b‧‧‧stator

51‧‧‧ motor box

51a‧‧‧Bottom cylinder

60‧‧‧Electrical insulation mechanism

S1‧‧O ring

S2‧‧‧ sealing material

Claims (4)

A drum type washing machine comprising: an outer tank for storing water inside; a drum rotatably supported in the outer tank to receive clothes; a drum motor rotating the drum; a water supply means for supplying water into the outer tank; and circulating a drum-type washing machine that sucks water from the outer tank to cause water to circulate toward the drum, wherein the circulation pump has an impeller that is sent from the outer tank toward the drum when water is sprayed into the drum. Rotating with water, and circulating a pump motor to rotate the impeller, and setting a circulation flow rate of water of the circulation pump when water is sprayed into the drum is set to 35 L/min or more, and the circulation pump motor is provided with a motor for preventing the circulation pump An electrical insulation mechanism generated by the shaft current of the shaft. The drum type washing machine according to the first aspect of the invention, wherein the rotation speed of the rotating shaft of the circulation pump motor is 2300 rpm or more and 4200 rpm or less. The drum type washing machine according to claim 1, wherein the electric insulating mechanism is configured to include the rotating shaft to which electrical insulation treatment has been applied. The drum type washing machine according to claim 1, wherein the electric insulating mechanism is a bearing having the rotating shaft, and the bearing includes a rolling element to which electrical insulation treatment has been applied.