TWI541406B - Drum washing machine - Google Patents

Description

Drum washing machine

The present invention relates to a drum type washing machine including a circulation pump that circulates washing water.

In the drum type washing machine, in the washing step, the washing water in the outer tank is taken up from the bottom by a circulation pump, and then the water is sprayed on the clothes to make the washing water permeate throughout the clothes (for example, refer to Patent Document 1). The above drum type washing machine can save water even if it has less water than the upright washing machine.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-170697

However, by increasing the circulating flow of washing water, the washing water is made more It is known to effectively soak the laundry to improve the washing performance and shorten the washing time. Further, in the drum type washing machine, an air trap (air storage portion) connected to the bottom of the outer tank is provided, and the pressure of the air trap is detected to detect the water level in the outer tank. However, in the drum type washing machine described in Patent Document 1, when the drain port is disposed directly below the air trap, when the circulating flow rate of the washing water is increased, the air trapped in the air trap prevents the washing water from entering the air trap. Internally, there is a problem of misdetection of the water level or failure to detect the water level.

The present invention has an object of providing a drum type washing machine which can increase the circulating flow rate of the washing water and which does not cause a problem in the detection of the water level.

A drum type washing machine according to the present invention includes: an outer tank that stores washing water therein; a drum that is rotatably supported in the outer tank; and a circulation pump that draws washing water in the outer tank and sprinkles water to the drum a water level detecting air storage unit disposed at a lowermost portion of the rear end surface of the outer tank; a hose extending from the circulation pump toward a bottom of the outer tank; and a joint connecting the bottom of the outer tank and the hose, The joint is disposed on the front side of the bottom surface of the drum, and the joint is connected to the hose on the circulation pump positioning side.

According to the present invention, there is provided a drum type washing machine which can increase the circulation flow rate of the washing water and which does not cause a problem at the time of water level detection.

1‧‧‧ frame

2‧‧‧ outer trough

2e‧‧‧Anti-gas valve (air storage)

2s‧‧‧ bottom

2u‧‧‧ rear end face

3‧‧‧Roller

3c‧‧‧ bottom

21a‧‧‧Drain fittings (joints)

22‧‧‧Bee belly tube (hose)

24‧‧‧Circulating pump

S‧‧‧Roller washing machine

Fig. 1 is a perspective view showing the appearance of a drum type washing machine in accordance with an embodiment of the present invention.

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

Fig. 3 is a cross-sectional view taken along the line A-A of Fig. 2;

Figure 4 is a perspective view showing the circulation pump and the circulation flow path from the front.

Fig. 5 is a perspective view showing a circulation flow path inside the circulation pump.

Fig. 6 is a top view showing the circulation pump from above.

Figure 7 is a perspective view showing the bottom of the outer tank from the rear.

Fig. 8(a) is a cross-sectional view taken along line B-B of Fig. 7, and Fig. 8(b) is a cross-sectional view corresponding to Fig. 8(a) as a comparative example.

Fig. 9(a) is a top view showing a flow path from the bottom of the outer tank toward the circulation pump, and Fig. 9(b) is a top view showing a flow path from the bottom of the outer tank as a comparative example toward the circulation pump.

Next, the drum type washing machine of the present embodiment will be described in detail below with reference to appropriate drawings. First, the overall configuration of the drum type washing machine will be described with reference to Figs. 1 and 2 . Fig. 1 is a perspective view showing the appearance of a drum type washing machine in accordance with an embodiment of the present invention, and Fig. 2 is a side view schematically showing an internal structure of the drum type washing machine. The front, back, left, and right sides described below are the drum type washing machines shown in Fig. 1 from the front. The direction of the front, back, left, and right and left is the reference.

As shown in Fig. 1, a drum type washing machine (hereinafter simply referred to as a washing machine) S includes a frame body 1 having an outer contour, an operation panel 6, a detergent bowl 7, and a door 9.

The frame 1 is mounted on the base 1h by: left and right side cases 1a, 1b; front case 1c; rear case 1d (see Fig. 2); upper case 1e and lower front case 1f . Further, the housing 1 is a left side case 1a, 1b, a reverse-shaped upper reinforcing member 36 (see Fig. 2), a front reinforcing member 37 (see Fig. 2), and a rear reinforcing member (not shown). In combination, the base 1h is formed in a box shape.

The operation panel 6 is 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. Further, the operation panel 6 is electrically connected to a control device 38 (see FIG. 2) provided at a lower portion of the casing 1.

The detergent disk 7 is provided on the upper left side of the casing 1, and can be pulled out toward the front (front side) with respect to the casing 1.

As shown in Fig. 2, the lotion tray 7 can be attached to the lotion container 19 provided on the upper left side of the casing 1. When the lotion is placed, the lotion tray 7 is pulled out as indicated by the two dotted lines in Fig. 1. The lotion container 19 is fixed to the upper reinforcing member 36 of the casing 1. Further, a water outlet 19a is formed slightly behind the left side surface of the lotion container 19. Further, the bottom surface of the lotion container 19 is a polishing dome shape in which the position at which the nozzle 19a is formed is the lowest.

The door 9 is an input port for closing and placing the clothes which are disposed substantially at the center of the front casing 1c, and may be provided at the hinge of the front reinforcing member 37. The 9c support is openable and closable. The door open key 9d (refer to Fig. 1) provided near the door 9 is pressed to open the latch mechanism (not shown), and then opened, and the door 9 is pressed and locked toward the front case 1c to be closed. The front reinforcing material 37 is the same as the opening of the outer tank 2 to be described later, and has a circular opening for taking out the laundry (washing material).

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

Further, the washing machine S includes a bottomed cylindrical outer tank 2, a bottomed cylindrical drum 3, a drain joint 21a (joint), a bellows tube 22 (hose), a circulation pump 24, and an air trap 2e ( Air storage unit).

The outer tub 2 is formed by enclosing the drum 3 coaxially, and has an opening at the front, and a motor 4 is attached to the outer center of the rear end surface 2U. The rotating shaft of the motor 4 penetrates the outer tub 2 and is coupled to the drum 3. An outer tank casing 2d capable of storing water in the outer tank 2 is provided at an opening portion in front of the outer tank 2.

Further, the outer tub 2 is supported by the damper 5 having the lower side fixed to the base 1h and the spring (not shown) provided on the upper side in the housing 1 . A bellows 10 made of rubber is provided at the opening in front of the outer tub 2, and the shutter 9 is closed to seal the outer tank 2.

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

Further, a concave recessed portion 2f extending in the axial direction of the outer groove 2 continuous with the inner peripheral surface of the bottom side of the outer tub 2 is provided in the bottom portion 2s of the outer tub 2. A drain port 21 is provided on the bottom surface of the recessed portion 2f. An inflow port 18 for circulating water at the bottom is provided on the front side of the recess 2f.

The drum 3 has a function as a washing and dewatering tank, and has a plurality of through holes 3s for water passage and ventilation on the outer wall and the bottom wall (see Fig. 8(a)). Further, an opening portion 3a for taking out the garment is provided on the front end surface of the drum 3. A fluid balancer 3b integral with the drum 3 is provided at the periphery of the opening portion 3a. Further, the central axis of rotation of the drum 3 is horizontal or inclined so that the opening side is higher.

The drain joint 21a is attached to the drain port 21 through an O-ring (not shown) so that the washing water does not leak from the joint portion of the drain joint 21a and the drain port 21.

The bellows 22 guides the washing water remaining in the outer tub 2 to the circulation pump 24, and one end (upstream end) of the bellows tube 22 is connected to the drain joint 21a, and the other end is connected to the circulation pump 24.

The circulation pump 24 sucks the washing water at the bottom of the outer tank 2 and sprinkles it into the drum 3, and is disposed below the outer tank 2. Further, one end side of the drain hose 26 is connected to the water discharge port 23b (see Fig. 6) of the circulation pump 24. Further, a drain valve 25 is provided in the middle of the drain hose 26 extending into the machine.

The air trap 2e is provided at the lowermost portion of the rear end surface 2u of the outer tub 2. A hole 2e1 communicating with the outer tub 2 is provided at a lower portion of the air trap 2e. Moreover, the upper portion of the anti-gas valve 2e is connected by the tube 35 and the water level sensor 34. Pick up. The air pressure in the water level sensor 34 is detected, thereby detecting the water level in the outer tank 2.

Further, the washing machine S includes a filter box 23 and a drain valve 25 together with the circulation pump 24 between the outer tub 2 and the base 1h, and a drying duct 29 is provided inside the rear surface of the casing 1.

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. Further, the filter case 23 is provided with a door 1g provided in the lower front case 1f, and the rotating handle 23d can easily detach the filter (not shown). The filter box 23 is inclined at a higher front side. In addition, the circulation of the washing water centering on the circulation pump 24 will be described in detail later.

The drying duct 29 is connected to an intake port (not shown) provided at the rear of the outer tub 2 via a rubber bellows tube 29a. A water-cooling dehumidification mechanism (not shown) is provided in the drying line 29. Further, 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. Furthermore, a heat pump can be used instead of the heater and the water-cooling dehumidification mechanism.

Fig. 3 is a cross-sectional view taken along the line A-A of Fig. 2;

As shown in Fig. 3, a partition wall W continuous from the inner peripheral surface 2t 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 3t 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. A partition wall W may be disposed on the upper portion of the drain port 21 and the inflow port 18.

When the depressed portion 2f is discharged by the centrifugal force generated by the rotation of the drum 3 during dehydration, the water is prevented from being directed toward the drum when the water is discharged from the through hole 3s of the drum 3 (see Fig. 8(a)) toward the inner peripheral surface side of the outer tub 2. The water flowing in the same direction in the rotation direction R of 3 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.

Further, a recessed portion 2f having a wide width is formed in the direction around the outer tub 2, and the amount of water stored in the outer tub 2 can be increased by a conventional drum type washing machine. By the expansion of the recessed portion 2f, the number of revolutions of the circulation pump motor 47 (see FIG. 4) of the circulation pump 24 can be increased, and a large amount of washing water can be sucked into the circulation pump motor 47. As a result, the circulation flow rate of the washing water can be increased, and the washing efficiency of the clothes can be improved more than conventionally.

Fig. 4 is a perspective view showing the circulation pump and the circulation flow path from the front, Fig. 5 is a perspective view showing the circulation flow path from the inside of the outer tank casing, and Fig. 6 is a view showing the circulation pump from above. view.

As shown in FIG. 4, the circulation pump 24 includes a pump casing 42 and a circulation pump motor 47 which are integrally formed with the filter box 23. The pump casing 42 is formed with an intake port 43 (see Fig. 6), a discharge port 44, 45, a water inlet port 23a, and a water discharge port 23b (see Fig. 6).

The discharge port 44 communicates with the circulation flow path 27 provided on the inner peripheral wall of the outer tank casing 2d via the bellows pipe 41.

The spit out 45 is connected to the joint 18a via the bellows 40 Pick up. The joint 18a is provided at an inflow port 18 formed adjacent to the recess 2f of the outer tub 2.

As shown in Fig. 5, the circulation flow path 27 is formed in an arc shape from the lower portion toward the upper portion along the opening portion on the front surface of the outer tank casing 2d, and has a nozzle 27a for washing water in the drum 3 at the front end portion (upper end).

Further, 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. Further, the cross-sectional area of the circulation flow path 27 is preferably a circular shape equivalent to a diameter of 25 mm or more.

As shown in Fig. 6, the suction port 43 is a substantially circular through hole that connects the filter box 23 and the pump casing 42, and is formed coaxially with the impeller 46 of the circulation pump 24.

Furthermore, the bellows tube 41 (see Fig. 4) and the circulation flow path 27 (see Fig. 5) are formed together with the bellows tube 22 (see Fig. 4) from the bottom 2s of the outer tank 2 (see Fig. 2). The circulation path to the upper portion of the outer tank 2.

When the circulation pump 25 of the circulation pump 24 is rotated in the state where the drain valve 25 (see Fig. 2) is closed, the washing water in the outer tub 2 passes through the drain joint 21a from the drain port 21 (see Fig. 3). (Refer to Fig. 3), the bellows tube 22 (see Fig. 3), 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 from the suction port 43 (refer to the arrow direction F in Fig. 6), is discharged from the discharge port 44, and is sent to the circulation flow path 27 (see Fig. 5), and is fed from the nozzle 27a (see the 5)) Sprinkle water toward the drum 3 (see Figure 2).

When the circulation pump 25 of the circulation pump 24 is reversed in a state where the drain valve 25 (see FIG. 2) is closed, the washing water in the outer tub 2 passes through the bellows 22 from the drain port 21 (see FIG. 3). (Refer to Fig. 3), foreign matter is removed by a filter (not shown) in the filter box 23. Thereafter, the washing water enters the pump casing 42 from the suction port 43, and is discharged from the discharge port 45, and returned to the outer tank 2 via the bellows pipe 40 (see Fig. 4) and the joint 18a (see Fig. 4).

When the drain valve 25 is opened (see FIG. 2), 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 (see FIG. 2) to the outside of the machine.

Further, in the present embodiment, in order to secure the circulation flow rate, it is preferable to set the number of revolutions of the circulation pump motor 47 to 2,600 rpm or more and 3,500 rpm or less. This speed is controlled by the control unit 38 (see Fig. 2). In other words, it is preferable to set the circulation flow rate of the washing water generated by the circulation pump 24 to 36 liters/minute or more and 53 liters/minute or less.

When the number of revolutions of the circulation pump 24 is less than 2,600 rpm, the washing ratio (cleaning performance) is lower than that of the conventional drum type washing machine. Further, even if the number of revolutions of the circulation pump 24 is higher than 3,500 rpm, only a slight increase in the washing ratio increases the power consumption, which is not preferable. In addition, the washing ratio is a ratio of the degree of cleaning of the test washing machine to the washing degree of the standard washing machine, and 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, the bellows tube 22 of the present embodiment is a part constituting the circulation flow path, and is set to be 35 mm or more, preferably 37 to 50 mm left. right. 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 drain 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 drain joint 21a from the side of the circulation pump 24, the length from the drain joint 21a to the inlet of the water inlet port 23a of the circulation pump 24 can be shortened. Further, the inner diameter of the bellows tube 22 located on the upstream side of the circulation pump 24 is 35 mm or more thicker than usual, and the flow path resistance can also be reduced at this point. Therefore, 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.

Figure 7 is a perspective view showing the bottom of the outer tank from the rear.

As shown in Fig. 7, an anti-gas valve 2e is integrally provided with the outer groove 2 at the rear end surface 2u of the outer tub 2. That is, the air trap 2e is formed in a substantially semi-cylindrical shape and protrudes from the rear end surface 2u (back surface) of the outer tub 2. A connection port 2e2 to which the pipe 35 (see Fig. 2) is connected is provided at the upper end of the air damper 2e.

Further, the air trap 2e is disposed to be displaced toward the right side (the left side in FIG. 7) from the rotation center O of the drum 3 (see FIG. 2). This is because the drain port 21 is provided corresponding to the partition wall W (see FIG. 3) (see FIG. 3).

The recessed portion 2f of the outer tub 2 is provided with a transporting metal member 50 for preventing the outer tub 2 from vibrating when the washing machine S is transported. The conveying metal member 50 is The metal plate material is formed by bending into a substantially U-shape, and has a horizontal portion 51 extending in the horizontal direction in the horizontal direction and upright portions 52 and 52 extending upward from the left and right ends of the horizontal portion 51. The upper end portion of each of the upright portions 52 is bent outward in an L shape, and is fixed to the recessed portion 2f of the outer tub 2 via a bolt (not shown).

Fig. 8(a) is a cross-sectional view taken along line B-B of Fig. 7, and Fig. 8(b) is a cross-sectional view corresponding to Fig. 8(a) as a comparative example.

As shown in Fig. 8(a), the bottom surface of the recessed portion 2f has a horizontal surface 2f2 extending in parallel with the horizontal direction (front-rear direction) toward the inclined surface 2f1 extending in parallel with the rotation center of the drum 3. The inclined surface 2f1 is formed so as to descend from the front end of the recessed portion 2f to the position of the damper 5 on the front side of the bottom surface 3c of the drum 3. The horizontal surface 2f2 is formed from the rear end of the inclined surface 2f1 to the position of the air trap 2e.

Further, a drain port 21 is formed in the recessed portion 2f at the rear end of the inclined surface 2f1, and a drain joint 21a is attached to the drain port 21. Therefore, the drain port 21 is located at the lowermost portion of the outer tub 2.

The drain joint 21a has a substantially cylindrical recessed portion 21a1 that protrudes in a direction orthogonal to the inclined surface 2f1, and a tube that extends laterally (left side) from the side surface (peripheral surface) of the recessed portion 21a1. The unit 21a2 is configured. Further, the drain joint 21a including the drain port 21 is located on the front side of the bottom surface 3c of the drum 3 as a whole.

Further, the drain joint 21a is located on the front side of the conveying metal member 50. Further, the position of the conveying metal member 50 in the front-rear direction coincides with the center of gravity G of the assembly including the outer tub 2 and the drum 3.

The air trap 2e is configured such that the difference D between the lowermost surface H1 of the drum 3 and the detecting surface H2 is equal to or greater than the detection error (for example, 20 mm) of the water level sensor 34. Further, the horizontal plane 2f2 extends to the same plane as in the cylinder of the air trap 2e.

However, as a comparison, for example, in the eighth (b) diagram, when the washing machine in which the drain port 121 is provided directly below the air trap 122e increases the circulating flow rate of the washing water, the following problem arises. In other words, when the circulation flow rate of the washing water is increased, the flow rate of the washing water flowing in the lower portion of the hole 122e1 of the purge valve 122e is increased, and the air in the purge valve 122e is caught, so that the wash water intrudes into the purge valve 122e. Therefore, if the water level detecting surface H11 is changed, there is a problem that the water level cannot be detected correctly.

Therefore, in the present embodiment, as shown in Fig. 8(a), the drain joint 21a is disposed further forward than the bottom surface 3c of the drum 3 so that the washing water does not pass right below the air trap 2e. Thereby, the air caught in the air trap 2e is prevented from intruding into the air trap 2e, so that the water level in the outer tub 2 can be accurately detected.

Fig. 9(a) is a top view of the flow path from the bottom of the outer tank toward the circulation pump, and Fig. 9(b) is a top view of the flow path from the bottom of the outer tank as a comparative example toward the circulation pump.

However, in the comparative example shown in Fig. 9(b), the drain joint 121a of the drain port 121 is disposed to overlap the transporting metal member 150 (see Fig. 8(b)) in the up-and-down direction, so that the drain joint 121a is transported by the metal fittings. 150 around the bottom and left and right sides. Therefore, toward the side of the circulation pump 124, the bellows tube 122 cannot be connected, and once the bellows tube 122 is pulled out toward the rear, there is a surrounding It is necessary to connect the metal member 150 to the circulation pump 124. As a result, the bellows tube 22 becomes longer (for example, 460 mm), the flow path resistance of the washing water is increased, and the flow of the washing water is hindered when the circulating flow rate of the washing water is increased, and the air is blocked by the circulation pump 124 being trapped in the air. After that.

Therefore, as shown in Fig. 9(a), in the present embodiment, the drain joint 21a connected to the drain port 21 is disposed on the front side of the transporting metal member 50 (see Fig. 8(a)) to transport the metal member 50. (The upright portion 52) is not located on the side where the circulation pump 24 is disposed. Thereby, the bellows tube 22 can be connected to the circulation pump 24 side (left side in the drawing), and the bellows tube 22 can be shortened. As described above, the bellows 22 can be shortened, whereby the flow path resistance of the washing water can be reduced, and the air plug of the air trap 24 can be prevented even if the circulating flow rate of the washing water is increased.

Moreover, in the comparative example of FIG. 9(b), the water inlet crucible 123a of the filter box 123 is arrange|positioned, and it is arrange|positioned to the outer side (left side of the figure) with respect to the center axis of this filter box 123. On the other hand, in the present embodiment shown in Fig. 9(a), the water inlet 23a is disposed above the filter box 23, and the length of the bellows tube 22 is shortened. Thereby, the flow path resistance of the wash water passing through the bellows tube 22 can be further reduced.

Next, the operation procedure of the washing machine S will be described. In the following description, the standard stroke (washing ~ washing twice ~ dehydration) is selected for explanation.

First, the operation stroke is selected after the power is turned on, and when the operation start key is selected, the washing amount and the operation time are displayed on the display 14 in accordance with the weight of the clothing or the like. Subsequently, the user puts the lotion into the lotion tray 7.

Thereafter, the water supply solenoid valve 16 is controlled, via the bellows tube 20, The water supply port 2a of the outer tub 2 supplies wash water (water + lotion) to the recessed portion 2f of the outer tub 2. Then, the circulation pump 24 is controlled such that the washing water flowing in from the drain port 21 through the bellows tube 22 is discharged from the inflow port 18 of the recessed portion 2f via the bellows tube 40. The washing water discharged from the inflow port 18 flows into the recessed portion 2f and forms a circulation toward the drain port 21. Thereby, the water and the lotion in the wash water are stirred, and the lotion is dissolved in water.

Then, the washing step is performed, the water supply solenoid valve 16 is controlled, the water level of the washing water in the outer tank 2 is raised, and the motor 4 is controlled to rotate the drum 3 in the forward and reverse directions at a predetermined rotation speed (for example, 40 rpm) to carry out the clothing type. Flip. Further, the circulation pump 24 is controlled to have a predetermined number of revolutions (for example, 2,600 rpm), so that the water (washing water) having a high concentration of the lotion sucked from the drain port 21 passes through the bellows tubes 22 and 41 and the circulation flow path 27. Then, the nozzle 27a provided in the opening of the outer tub 2 is discharged toward the inside of the drum 3, whereby the washing water is mixed into the clothes inside the drum 3 (rotating water supply step).

In addition, the circulation pump 24 is controlled to have a predetermined number of revolutions (for example, 3,200 rpm), and the washing water (washing water) sucked from the drain port 21 is provided in the opening of the outer tub 2 via the bellows tubes 22 and 41 and the circulation flow path 27. The nozzle 27a is discharged to the inside of the drum 3. And controlling the motor 4 so that the drum 3 is rotated at a predetermined rotation speed (for example, 100 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 machine generated when falling from above the drum 3 can be prevented. Application of force (pre-washing agitation step).

In addition, the circulation pump 24 is controlled to have a predetermined flow rate (for example, 3,200 rpm), and the washing water (washing water) sucked from the drain port 21 is provided in the opening of the outer tub 2 via the bellows tubes 22 and 41 and the circulation flow path 27. The nozzle 27a is discharged to the inside of the drum 3. The motor 4 is controlled such that the drum 3 is rotated at a predetermined rotational speed (for example, 40 rpm), thereby knocking and washing the clothes inside the drum 3.

Then, the drum 3 is rotated in the opposite direction (for example, 260 rpm) at the medium speed in the washing step after the draining step and the spin-drying step, and the drain valve 25 is closed, and the water supply solenoid valve 16 is controlled to spread the water in the clothes. In addition, the circulation pump 24 is controlled to have a predetermined flow rate (for example, 3,200 rpm), and the washing water (washing water) sucked from the drain port 21 is provided in the opening of the outer tub 2 via the bellows tubes 22 and 41 and the circulation flow path 27. The nozzle 27a is discharged to the inside of the drum 3. After 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.

Then, the water supply solenoid valve 16 is controlled, and the washing water containing the soft processing agent is supplied into the outer tub 2, and the drum 3 is rotated in both the forward and reverse directions, and the washing water and the soft processing agent supplied into the outer tub 2 are mixed. And, the water supply solenoid valve 16 is controlled to supply water to the outer tank 2 to a predetermined water level. Moreover, the control motor 4 rotates the drum 3, and controls the circulation pump 24 to have a predetermined flow rate (for example, 2,600 rpm) so that the washing water (washing water) sucked from the drain port 21 passes through the bellows tubes 22 and 41 and the circulation flow path 27. The nozzle 27a provided in the opening of the outer tub 2 is discharged toward the inside of the drum 3, and the soft processing agent is incorporated into the clothes.

Then, the motor 4 is controlled to rotate the drum 3, and the circulation pump 24 is controlled to have a predetermined flow rate (for example, 3,200 rpm), and the washing water (washing water) sucked from the drain port 21 is passed through the bellows tubes 22 and 41 and the circulation flow path 27. From the nozzle 27a provided at the opening of the outer tank 2 toward the inside of the drum 3 Spit out and wash the clothes. And, when the predetermined time elapses, the stirring step is ended and the final dehydration step is moved.

As described above, the washing machine S according to the present embodiment has the entire drain joint 21a disposed on the front side of the bottom surface 3c of the drum 3, and is connected to the bellows tube 22 on the side where the drain joint 21a is positioned on the circulation pump 24. Thereby, the entire drain joint 21a is disposed on the front side of the bottom surface 3c of the drum 3 (refer to Fig. 8(a)), and even if the circulation flow rate of the washing water is increased, the washing water can be prevented from intruding into the air trap 2e. , correctly detect the water level in the outer tank 2. Further, the drain joint 21a is positioned on one side of the circulation pump 24 to be connected to the bellows tube 22, so that the bellows tube 22 connecting the drain joint 21a and the circulation pump 24 can be shortened, the flow path resistance can be reduced, and the circulation pump 24 can be prevented from being vented. Perform a cycle of large flow wash water.

Further, in the present embodiment, the air trap 2e is provided behind the drain joint 21a which is different from the drain joint 21a. Thereby, it is possible to surely prevent the washing water from intruding into the air trap 2e.

Further, in the present embodiment, the air trap 2e is integrally formed with the outer tub 2. Thereby, the shape of the air trap 2e does not become a large convex shape from the outer tub 2 (refer to FIG. 7), and space saving can be obtained.

Further, in the present embodiment, it is preferable that the inner diameter of the hose is 35 mm or more. Thereby, the flow path resistance of the wash water can be reduced, and the circulation flow rate of the wash water can be increased.

Further, in the present embodiment, it is preferable to set the circulation flow rate of the circulation pump 24 to 36 liters/min or more. Thereby, the washing performance can be sufficiently improved as compared with the past.

Further, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, this embodiment can also be applied to a drum type washing machine which does not have a drying function.

In the present embodiment, when the bellows tube 22 is directed from the drain joint 21a toward the circulation pump 24 (the water inlet port 23a), the bellows tube 22 is placed in a substantially right-angled state in the middle. However, the inlet pipe can be connected. The connection port of the bellows 22 of 23a faces the side of the drain joint 21a. Thereby, the bellows tube 22 is bent at a right angle, and the length of the bellows tube 22 is shortened, thereby further reducing the flow path resistance.

1c‧‧‧ front housing

1d‧‧‧Back shell

1e‧‧‧Upper casing

1f‧‧‧ lower front housing

1g‧‧‧

1h‧‧‧Base

2‧‧‧ outer trough

2a‧‧‧Water supply port

2d‧‧‧ outer casing

2e‧‧‧Anti-gas valve (air storage)

2e1‧‧‧ hole

2f‧‧‧Depression

2s‧‧‧ bottom

2u‧‧‧ rear end face

3‧‧‧Roller

3a‧‧‧ openings

3b‧‧‧Fluid balancer

4‧‧‧Motor

5‧‧‧ Shock Absorber

6‧‧‧Operator panel

7‧‧‧Dishwashing tray

9‧‧‧

9c‧‧‧Hinges

10‧‧‧ Bellows

15‧‧‧Water supply unit

17‧‧‧Bathing water pump

18‧‧‧Inlet

19‧‧‧Nurse container

19a‧‧‧Water outlet

20‧‧‧ snake tube

21‧‧‧Drainage

21a‧‧‧Drain fittings (joints)

22‧‧‧Bee belly tube (hose)

23‧‧‧Filter box

23d‧‧‧Handle

24‧‧‧Circulating pump

25‧‧‧Drain valve

26‧‧‧Drain hose

29‧‧‧Drying pipeline

29a‧‧‧Snake tube

34‧‧‧Water level sensor

35‧‧‧ tube

36‧‧‧Upper reinforcement

37‧‧‧Pre-reinforced materials

38‧‧‧Control device

S‧‧‧Roller washing machine

Claims (7)

A drum type washing machine, comprising: an outer tank for storing washing water therein; a drum rotatably supported in the outer tank; and a circulation pump for sucking the washing water in the outer tank and spraying water into the drum; a water level detecting air storage unit is disposed at a lowermost portion of the outer tank; a hose extends from the circulation pump toward a bottom of the outer tank; and a joint connects the bottom of the outer tank and the hose, and the joint is The joint is disposed on the front side of the bottom surface of the drum, and the joint is connected to the hose on the positioning side of the circulation pump. The drum type washing machine according to claim 1, wherein the air storage unit is provided separately from the joint and disposed behind the joint. The drum type washing machine according to claim 1, wherein the air storage unit is formed integrally with the outer tub. The drum type washing machine according to claim 2, wherein the air storage portion is formed integrally with the outer tub. The drum type washing machine according to any one of the items 1 to 4, wherein the inner diameter of the hose is 35 mm or more. The drum type washing machine according to any one of the items 1 to 4, wherein the circulating flow rate of the circulation pump is 36 liters/min or more. A drum type washing machine according to claim 5, wherein The circulating flow rate of the above circulating pump is 36 liters/min or more.