WO2013035277A1

WO2013035277A1 - Drum-type washing machine

Info

Publication number: WO2013035277A1
Application number: PCT/JP2012/005477
Authority: WO
Inventors: 堀部　泰之; 将大鈴木
Original assignee: パナソニック株式会社
Priority date: 2011-09-05
Filing date: 2012-08-30
Publication date: 2013-03-14
Also published as: CN103620105A; EP2754744B1; EP2754744A1; CN103620105B; JP5919488B2; JP2013052123A; EP2754744A4

Abstract

A drum-type washing machine, comprising: a water tank (2) that stores washing water; a rotating drum (4) rotatably arranged inside the water tank (2) and having an opening (5) on the front surface side thereof; a motor (9) that drives the rotating drum (4); a circulating water path (20) that circulates, towards the rotating drum (4), washing water that is inside the water tank (2); a pump (21) that sends the washing water that is inside the water tank (2) to the circulating water path (20); a nozzle water path (22) that is connected to the circulating water path (20) and is disposed in a substantially circular shape on the outside of the peripheral edge section (23) of the opening (5) of the rotating drum (4); a plurality of nozzles (26) disposed in the nozzle water path (22) so as to spray the washing water that is supplied by the pump (21), towards the inside of the rotating drum (4); and a control unit (32) that drives the motor (9) and the pump (21), and performs the washing steps. The washing steps include: a first rotation step in which the rotating drum (4) rotates at a speed whereat the washing items inside the rotating drum (4) do not stick to the inner peripheral wall of the rotating drum (4); and a second rotation step in which the rotating drum (4) rotates at a speed whereat the washing items inside the rotating drum (4) stick to the inner peripheral wall of the rotating drum (4). In the second rotation step, the control unit (32) drives the pump (21), and supplies washing water to the washing items stuck to the inner peripheral wall of the rotating drum (4).

Description

Drum type washing machine

The present invention relates to a drum-type washing machine for washing clothes and the like.

A conventional drum-type washing machine uses less water than a vertical washing machine, and part of the laundry in the water tank is not immersed in the washing water, so the washing water in the water tank is circulated by the pump into the rotating tank It spouts into the laundry (see, for example, Patent Document 1).

In the drum-type washing machine of Patent Document 1, washing water is ejected from a plurality of jet outlets formed by changing the angle little by little from the front side of the rotating tank to the center side of the rotating tank.

However, in the above-described conventional configuration, the jet nozzle is provided above the front side of the rotary tank, and jets washing water downward. For this reason, even if the washing water is spouted from a plurality of jet outlets by changing the angle little by little in the depth direction of the rotation tank, the washing water is evenly applied to the laundry present at various positions in the rotation tank. I had the problem that I could not do it. In addition, even if washing water can be poured evenly in the rotation tank, if a large amount of laundry is accommodated in the rotation tank, the washing water is supplied only to the laundry on the surface near the jet outlet, Washing water is difficult to spread to the laundry located inside the mass of laundry. Therefore, it had the subject that sufficient washing | cleaning and the rinse effect were not acquired in the conventional drum type washing machine.

Unexamined-Japanese-Patent No. 10-127978

The drum type washing machine according to the present invention comprises a water tank for storing washing water, a rotary tank rotatably disposed in the water tank and having an opening on the front side, a motor for driving the rotary tank, washing water in the water tank And a pump water passage that communicates with the circulating water passage and is provided in a substantially circular shape on the outer side of the peripheral portion of the opening of the rotating tank. And a plurality of nozzles provided in the nozzle channel so as to spout the washing water supplied by the pump toward the inside of the rotation tank, and a control unit which drives the motor and the pump to perform the washing step. . The washing step includes a first rotation step in which the laundry in the rotation tank rotates at a speed not to stick to the inner peripheral wall of the rotation tank, and a speed at which the laundry in the rotation tank sticks to the inner peripheral wall of the rotation tank And a second rotation step of rotating. In the second rotation step, the control unit drives the pump to supply wash water to the laundry stuck to the inner peripheral wall of the rotation tank.

With such a configuration, the washing water supplied into the water tank by the pump continues to be supplied uniformly not only to a part of the laundry in the vicinity of the spout but also to the entire laundry stuck to the inner peripheral wall in the rotating tank. be able to. As a result, regardless of the amount of laundry in the rotary tank, the washing efficiency can be enhanced.

FIG. 1 is a cross-sectional view showing a schematic structure of a drum-type washing machine according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of an essential part of the drum-type washing machine according to the first embodiment of the present invention. FIG. 3 is a view on arrow 3-3 of FIG. 1 of the drum type washing machine according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the nozzle of the drum-type washing machine in the first embodiment of the present invention. FIG. 5 is a cross-sectional view of a conventional nozzle. FIG. 6A is a schematic view showing the condition of the laundry in the rotary tub of the drum-type washing machine according to the first embodiment of the present invention. FIG. 6B is a schematic view showing the condition of the laundry in the rotary tub of the drum-type washing machine in the first embodiment of the present invention. FIG. 6C is a schematic view showing the condition of the laundry in the rotary tub of the drum-type washing machine in the first embodiment of the present invention. FIG. 7: is a schematic diagram which shows the condition of the laundry in the case of injecting circulating water from one nozzle. FIG. 8 is a schematic view showing the condition of the laundry in the case where the circulating water is sprayed from the plurality of nozzles of the drum-type washing machine in the first embodiment of the present invention. FIG. 9A is a time chart showing the operation of the washing process of the drum-type washing machine in the first embodiment of the present invention. FIG. 9B is a time chart showing the operation of the washing process of the drum-type washing machine in the first embodiment of the present invention. FIG. 9C is a time chart showing the operation of the washing process of the drum-type washing machine in the first embodiment of the present invention.

Hereinafter, a washing machine according to an embodiment of the present invention will be described with reference to the drawings. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

Embodiment 1
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic structure of a drum-type washing machine according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of an essential part of the drum-type washing machine according to the first embodiment of the present invention. FIG. 3 is a view on arrow 3-3 of FIG. 1 of the drum type washing machine in the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the nozzle of the drum-type washing machine in the first embodiment of the present invention.

In FIGS. 1 to 4, a water tank 2 formed in a bottomed cylindrical shape is elastically supported in a housing 1. A rotary tank 4 formed in a cylindrical shape with a bottom is rotatably disposed in the water tank 2. The rotation axis 10 of the rotation tank 4 substantially coincides with the cylindrical center line of the rotation tank 4, which also substantially coincides with the cylinder center line of the water tank 2. The water tank 2 and the rotary tank 4 are provided with

openings

5 and 6 on the front side respectively. With the opening 5 side of the water tank 2 on the front side of the housing 1, the rotation axis 10 of the rotation tank 4 is supported by being inclined forward (for example, 10 to 20 degrees) from the horizontal direction. By tilting the rotary shaft 10 upward, a deep water storage condition can be obtained with a small amount of water, and water conservation can be improved. However, if the water saving is not considered, the rotation axis 10 may be horizontal.

A door 7 that can be opened and closed is provided on the front surface of the housing 1 so as to face the opening 5 of the water tank 2 and the opening 6 of the rotating tank 4. The user can put the laundry into and out of the rotary tub 4 by opening the door 7. In addition, around the opening 5 of the water tank 2, a flexible bellows 8, for example, formed of an elastic material such as rubber is disposed. When the door 7 is closed, one end of the bellows 8 is in pressure contact with the inner surface thereof, and the opening 5 and the door 7 are sealed.

At the end face of the water tank 2 opposite to the opening 5, a motor 9 for driving the rotation tank 4 is attached. The rotor of the motor 9 is connected to the rotation tank 4 at the rotation axis 10 of the rotation tank 4, and the rotation of the motor 9 is transmitted to the rotation tank 4 by the rotation axis 10. A plurality of protrusions 12 are provided on the peripheral wall of the rotation tank 4 so as to protrude toward the rotation axis 10. The rotation of the rotation tank 4 causes the laundry to be caught by the protrusions 12 and lifted upward, thereby performing an agitation operation of dropping the laundry from a certain height.

A plurality of small holes 13 are provided in the peripheral wall of the rotation tank 4 over the entire circumference, and when the washing water in the water tank 2 is accumulated at a predetermined water level, the washing water enters the rotation tank 4 from the small holes 13 Is configured as. Here, the washing water includes the detergent component in the washing step.

Above the water tank 2, a detergent container 14 for containing a detergent is provided. The detergent container 14 is connected to a water supply valve 15 connected to a water tap. Supplying and stopping of the tap water to the detergent container 14 is performed by opening and closing the water supply valve 15. Further, a water supply path 16 for guiding the water introduced into the detergent container 14 together with the detergent into the water tank 2 is provided below the detergent container 14.

Below the water tank 2, a drainage port 17 for discharging the washing water in the water tank 2 is provided, and a drainage path 18 for leading the washing water discharged from the drainage port 17 to the outside of the housing 1 is provided. There is. A drain valve 19 is provided in the middle of the drain passage 18 for opening and closing the drain passage 18.

A circulating water passage 20 is connected to the drainage port 17 so that the washing water discharged from the water tank 2 passes through the rotation tank 4 and is led back into the water tank 2 and is branched on the way from the drainage path 18 . The circulating water channel 20 is disposed substantially horizontally below the water tank 2 from the lower rear of the water tank 2 toward the front. A pump 21 is provided in the middle of the circulating water passage 20. The pump 21 draws the wash water in the water tank 2 into the circulation water passage 20 from the drainage port 17, pressurizes the wash water flowing into the circulation water passage 20, waters it to the rotary tank 4, and circulates it to the water tank 2 through the circulation water passage 20. be able to.

Inside the front of the water tank 2, a nozzle water channel 22 is provided on the outer peripheral side of a circular opening 5 provided in the water tank 2 as viewed from the opening 6 side of the rotation tank 4. The nozzle water passage 22 communicates with the circulation water passage 20 and is provided in a substantially circular shape on the outer side of the peripheral portion 23 of the opening 6 provided in the rotary tank 4 in a circular shape. The opening 5 provided in the water tank 2, the opening 6 provided in the rotary tank 4, and the nozzle channel 22 are formed substantially concentrically. The inner peripheral edge 24 of the nozzle channel 22 is located radially outward of the peripheral edge 23 of the opening 6.

The wash water in the water tank 2 supplied by the pump 21 is led from the inlet 25 provided in the nozzle channel 22 through the circulation channel 20 into the nozzle channel 22, and at least three or more provided in the nozzle channel 22. It leads to a plurality of nozzles 26 (26a to 26g) (the example of FIG. 3 is seven). The nozzle 26 is provided so as to eject wash water from the nozzle water channel 22 toward the rotation axis 10 side of the rotation tank 4.

A space 27 is provided between the nozzle 26 and the peripheral portion 23 of the opening 6. The space portion 27 is provided with a reflection portion 28 for reflecting the cleaning water spouted from the nozzle 26 to the space portion 27 toward the opening 6. The reflection unit 28 is configured to guide the washing water jetted into the space 27 to the opening 6 and to be introduced into the rotation tank 4. The plurality of nozzles 26 (26a to 26g) are formed at positions away from the peripheral portion 23 of the opening 6 of the rotary tank 4. As a result, it is possible to apply the diffused washing water to the laundry in the rotary tank 4 without exposing the nozzle 26 to the opening 6 of the rotary tank 4. As a result, when the laundry is put into the rotary tub 4 or taken out, it is not caught by the opening 6 and the laundry is not damaged, and the laundry can be easily put in and out, and the usability can be improved.

There is no water guiding wall surface or the like for guiding the jet flow ejected from the nozzle 26 to the reflection unit 28, and the jet flow from the nozzle 26 collides with the collision surface 28 a of the reflection unit 28 after being discharged to the space 27. The collision surface 28 a is configured such that the jet flow from the nozzle 26 is guided from the opening 6 of the rotation tank 4 into the rotation tank 4 while being diffused. Therefore, even if the nozzle 26 is formed at a position separated from the peripheral edge 23 of the opening 6 of the rotation tank 4, the jet flow from the nozzle 26 is guided into the rotation tank 4 without receiving unnecessary wall resistance. . Such a configuration makes it possible to minimize the decrease in the flow rate of the washing water, and it is possible to supply the washing water to the laundry in the rotary tank 4 vigorously.

Further, the nozzle 26 has a round hole shape because it is not necessary to have a flat shape in order to be along the water guiding wall surface. The round hole shape is the shape having the smallest pressure loss if it has the same cross-sectional area. As a result, it is possible to minimize the decrease in the flow rate of the washing water ejected from the nozzle 26, and a sufficient amount of washing water can be supplied to the laundry in the rotary tank 4. In addition, since the rod-like jets are diffused by the reflection unit 28, the washing water can be applied to the laundry in the rotary tank 4 in a wide range, and the washing performance and the rinsing performance can be improved.

The reflective portion 28 is annularly disposed around the opening 5 so as to face the front surface portion of the rotary tank 4. The collision surface 28 a against which the cleaning water ejected from the nozzle 26 collides is an inclined surface which is inclined with respect to the jet direction from the nozzle 26. Thus, the jet from the nozzle 26 can be stably landed on the collision surface 28 a without being scattered in the collision surface 28 a in multiple directions, and can be diffused while flowing along the inclined surface. For this reason, washing water can be supplied to the laundry in the rotary tank 4 in a stable diffusion state.

As the inclination angle of the collision surface 28a with respect to the jet direction from the nozzle 26 is gentler, the jet can be more stably landed on the collision surface 28a and diffused. However, when the reflecting portion 28 is constituted only by the collision surface 28a, if the inclination angle of the collision surface 28a with respect to the jet flow direction from the nozzle 26 is gentle, the jet flow can be guided to the inner back direction of the rotation tank 4 Can not. For this reason, washing water is supplied only to the front clothes in the rotating tank 4.

Therefore, after the jet stream from the nozzle 26 collides with the collision surface 28 a, a guide portion 28 b for guiding the jet stream in the inner back direction of the rotary tub 4 is provided on the inner peripheral edge of the reflecting portion 28. The collision surface 28 a is inclined more gently than the guide portion 28 b with respect to the direction of the jet flow from the nozzle 26. Thereby, since it is not necessary to guide the jet stream from the nozzle 26 directly into the rotary tank 4 by the collision surface 28 a, the inclination of the collision surface 28 a can be set gently in the jet stream direction from the nozzle 26. Therefore, the jet from the nozzle 26 can be more stably landed on the collision surface 28 a and diffused. Thereafter, the guide portion 28 b guides the jet flow in the direction toward the inside of the rotary tank 4, so that washing water can be supplied to the laundry in the rotary tank 4 in a stable diffusion state.

Further, the reflecting portion 28 is configured such that the length for guiding the washing water in the guide portion 28b is shorter than the length for guiding the washing water on the collision surface 28a. In order to cause the jet jetted from the nozzle 26 to contact the collision surface 28a stably and diffuse it, the distance of the jet contact with the collision surface 28a needs to be longer than the collision range of the jet. is there. On the other hand, the function of the guide part 28b only changes the direction of the jet flow. For this reason, the distance where the jet stream contacts the guide portion 28b may be shorter than the distance where the jet stream contacts the collision surface 28a. Thereby, it is possible to minimize the decrease in the flow velocity of the jet in the guide portion 28b, to supply the washing water to the laundry in the rotary tank 4 more vigorously, and to improve the washing performance and the rinsing performance. be able to.

The washing water supplied by the pump 21 is jetted from the plurality of nozzles 26a to 26g provided in the nozzle water channel 22 as rod-like jets toward the rotation axis 10. The washing water spouted into the space 27 collides with the collision surface 28 a of the reflection part 28 and is reflected toward the opening 6 of the rotation tank 4 and diffused in the rotation direction of the rotation tank 4 and by the guide 28 b The gas is jetted from the vicinity of the peripheral portion 23 of the opening 6 toward the inside of the rotary tank 4.

A plurality of nozzles 26 are provided in a nozzle water passage 22 provided in a substantially circular shape on the outside of the peripheral portion 23 of the opening 6, and the jet direction of the washing water in all the nozzles 26 a to 26 g When viewed from the opening surface side of the rotary tank 4 from the direction toward 10, displacement is performed in the same direction at a predetermined displacement angle (displacement angle) θ1.

Thereby, the range through which the washing water spouted into the rotation tank 4 can be expanded, and the washing water can be efficiently and evenly supplied to the laundry in the rotation tank 4. If the displacement angle (displacement angle) in the jetting direction of the washing water is too large, a portion where the washing water does not pass may occur in the vicinity of the rotation axis 10. For this reason, as a suitable example for preventing the occurrence of a portion where wash water does not pass in the vicinity of the rotation axis 10, a displacement angle (shift angle) θ1 for shifting the jet direction B of the wash water with respect to the rotation axis 10 is It is preferable to set to about half (for example, 5 to 15 degrees) of the spread angle θ 2 (for example, 10 to 30 degrees) of the washing water diffused in the rotational direction of the rotation tank 4.

The nozzle water channel 22 is provided with a bulging portion 29 in which a part of the nozzle water channel 22 is inflated toward the rotation axis 10 of the rotary tank 4. The nozzle 26 is configured by providing a circular nozzle hole 31 in the flat portion 30 of the bulging portion 29. The length L of the nozzle hole 31 is equal to or less than the diameter d of the nozzle hole 31. The flat portion 30 is orthogonal to the ejection direction of the cleaning water ejected from the nozzle hole 31 and inclined at the same angle as the displacement angle (shifting angle) θ1 from the direction toward the rotation axis 10 in the ejection direction of the cleaning water There is.

Since the inside of the bulging portion 29 is isolated from the main flow (dotted line arrow) of the washing water flowing in the nozzle water channel 22 to the end 22a, the nozzles 26 (26a to 26g) are hardly affected by the main flow of washing water . Therefore, the disturbance of the jet flow ejected from the nozzles 26 (26a to 26g) can be suppressed, and the direction of the flush water to be ejected can be stabilized. Further, since the jet flow from the nozzles 26 (26a to 26g) can be contracted, the flow velocity of the jet can be increased, and the momentum of the jetted washing water can be strengthened.

This will be described in detail. FIG. 5 is a cross-sectional view of a conventional nozzle. As shown in FIG. 5, normally, the nozzle 100 is formed so that the inner wall surface 103 of the nozzle water passage 102 gradually and smoothly becomes smaller toward the nozzle hole 101 in order to minimize pressure loss. Thus, the flow of water in the nozzle water channel 102 is prevented from separating from the inner wall surface 103 immediately before the jet flow spouts from the nozzle hole 101 to prevent the turbulent flow, and the efficient nozzle 100 is configured. In such a nozzle 100, the flow velocity of the jet flow from the nozzle hole 101 is determined by the cross-sectional area of the nozzle hole 101 if the flow rate of the jet flow is the same. In order to increase the flow velocity of the jet, it is necessary to increase the flow rate or reduce the cross-sectional area of the nozzle hole 101.

However, when the circulation flow rate of the circulating water passage 20 for supplying the washing water to the nozzle water passage 22 is increased, the water level in the water tank 2 is lowered, and air is easily mixed in the pump 21. As a result, the pump 21 is in a so-called air entrainment state, and there is a problem that the circulation flow rate of the circulation water passage 20 is reduced. For this reason, in the case where the amount of water stored in the water tank 2 is reduced to perform washing, there is a limit to the increase of the flow rate circulating through the circulation water passage 20. In addition, when the cross-sectional area of the nozzle hole 31 is reduced, there is a problem in reliability such as lint and the like generated from the laundry clogging the nozzle hole 31 or the like. Therefore, the cross-sectional area of the nozzle hole 31 is limited. There is.

Therefore, according to the present invention, as shown in FIG. 4, the nozzle water channel 22 is provided with a bulging portion 29 expanded toward the rotation axis 10 side of the rotary tank 4, and the nozzle hole 31 is surrounded by the nozzle hole 31 in the penetrating direction A substantially vertical flat portion 30 is provided. In the vicinity of the inner wall surface 22b in the nozzle channel 22 created by the bulging portion 29, the viscosity of the fluid causes the washing water to flow along the inner wall surface 22b. However, when the washing water is spouted from the nozzle holes 31 as a jet, the inner wall surface 22 b is suddenly bent about 90 degrees, so the flow of the washing water is separated from the peripheral wall of the nozzle holes 31.

For this reason, as shown in FIG. 4, the cross-sectional area C of the jet flow is smaller than the cross-sectional area D of the nozzle hole 31, that is, contracted. Thus, even if the flow rate is the same in the nozzle 26 of the present embodiment and the cross-sectional area of the nozzle hole 31 is the same, the flow velocity of the jet can be made faster than a normal nozzle. You can strengthen the momentum of

Further, the nozzle hole 31 has a circular shape in the EE cross section of FIG. Thereby, since the jet flow is uniformly contracted, the disturbance of the jet flow from the nozzle hole 31 can be suppressed, and the washing water can be jetted in the set direction and applied to the laundry. In addition, since the nozzle holes 31 have no corners, it is difficult for lint and the like generated from the laundry to be caught in the nozzle holes 31, and it is possible to prevent hole clogging due to lint.

Further, the nozzle hole 31 has a length L of the nozzle hole 31 equal to or less than the diameter d of the nozzle hole 31. If the nozzle hole 31 is too long in the jetting direction, the flow once separated from the peripheral wall of the nozzle hole 31 and contracted is gradually spread and jetted. As a result, since the effect of increasing the flow velocity of the jet flow is lost, the length L of the nozzle hole 31 is preferably equal to or less than the diameter d of the nozzle hole 31. As a result, the flow velocity of the jet flow from the nozzle holes 31 can be reliably increased, and hence the momentum of the jetted cleaning water can be surely increased.

Further, the nozzle water channel 22 is branched in two directions from the inflow port 25 and configured to extend toward the end 22 a. For this reason, since the path of water flowing in the nozzle water channel 22 is divided into two, even if the nozzle water channel 22 is annularly long so as to surround the opening 5, the flow path can be shortened. Therefore, the pressure loss in the path can be reduced. Therefore, sufficient pressure can be applied to each of the nozzles 26a to 26g, and the flow velocity of the jet jetted from the nozzles 26 can be secured. Thereby, washing water can be evenly applied to the laundry in the rotary tank 4. The nozzle water channel 22 is the same as in the annularly formed configuration without the end 22a because it is branched from the inflow port 25 in two directions.

Further, the direction in which the washing water flows from the inflow port 25 into the nozzle water channel 22 is configured to be in the direction of the rotation axis 10 (arrow F) of the rotation tank 4. Therefore, the flow of washing water in two directions can be smoothly branched, and sufficient pressure can be applied to each of the nozzles 26a to 26g. Thereby, the flow velocity of the jet flow ejected from the nozzle 26 can be secured.

A control unit that controls the motor 9, the water supply valve 15, the drain valve 19, the pump 21 and the like in the lower rear of the housing 1 and controls operations of washing, rinsing, and dewatering processes based on a set program. 32 are provided.

Hereinafter, the operation and action of the drum-type washing machine configured as described above will be described. 6A to 6C are schematic views showing the condition of the laundry in the rotary tub of the drum-type washing machine according to the first embodiment of the present invention. 9A to 9C are time charts showing the operation of the washing process of the drum-type washing machine according to the first embodiment of the present invention.

When the user opens the door 7 and puts the laundry into the rotary tub 4 to start the operation, the control unit 32 detects the amount of the loaded laundry. Thereafter, the water supply valve 15 is opened, the washing water dissolves the laundry detergent stored in the detergent container 14, and the washing water is supplied from the water supply path 16 into the water tank 2.

The flush water stored in the water tank 2 is detected by a water level detector (not shown). When the washing water of the amount of water set according to the amount of the laundry is stored, the control unit 32 stops the water supply and starts the washing. The rotation tank 4 is driven to rotate in the forward and reverse directions by the motor 9, and the laundry stored in the rotation tank 4 is lifted in the rotation direction by the projections 12 provided on the cylindrical wall 11 of the rotation tank 4 and then dropped. , The laundry is washed by the action of tap washing.

The water level of the washing water is set by the distance at which the laundry falls to the washing water so that the effect of tapping and washing can be obtained, and the washing water is stored to the lower side in the rotary tank 4. However, when the water level in the water tank 2 is low, it is difficult for wash water to spread throughout the entire laundry. Therefore, when the pump 21 is operated to lower the washing water into the laundry in the rotation tank 4, the washing water in the water tank 2 is drawn into the circulating water channel 20 from the drainage port 17 provided at the bottom of the water tank 2. .

The washing water supplied from the circulating water passage 20 to the nozzle water passage 22 through the inlet 25 is branched in two directions toward the end 22a of the nozzle water passage 22 formed in an annular shape, and the plurality of nozzles provided at equal intervals 26 (26a to 26g) and spouting while diffusing into the rotating tank 4; At the time of washing and rinsing, the control unit 32 operates the pump 21 to circulate the washing water in the water tank 2 and apply the washing water evenly to the laundry.

The plurality of nozzles 26 (26a to 26g) have predetermined displacement in the same direction from the direction toward the rotation axis 10 of the rotation tank 4 when the jet direction B of the washing water is viewed from the opening surface side of the rotation tank 4 It is configured to be displaced at an angle (displacement angle) θ1. For this reason, it is possible to evenly expand the range in which wash water supplied to the water tank 2 by the pump 21 is spouted into the rotating tank 4. As a result, it is possible to increase the opportunity for washing water to be applied to the laundry being agitated and moved in the rotary tank 4, and the washing water can be continuously supplied evenly to the entire laundry in the rotary tank 4.

Further, at least one or more nozzles 26 g of the plurality of nozzles 26 are configured to eject the washing water from the vicinity of the upper end of the peripheral portion 23 of the opening 6 of the rotation tank 4 toward the inside of the rotation tank 4. For this reason, the washing water can be poured from the vicinity of the uppermost point of the laundry, and the washing water supplied to the upper laundry flows downward by gravity. In this process, since the washing water is also supplied to the lower laundry, the washing water can be efficiently and evenly supplied to the entire laundry.

In the washing process of the drum type washing machine, the above-mentioned operation of tapping is the main. The tap washing is performed by a first rotation step of rotating at a speed such that the laundry in the rotation tank 4 does not stick to the inner peripheral wall of the rotation tank 4, for example, 45 r / min. However, depending on the amount of laundry and the type of dirt, the action of centrifugal cleaning is effective. Centrifugal cleaning is performed by a second rotation process in which the laundry in the rotation tank 4 is rotated at a speed such as 100 r / min, for example, to stick the inner peripheral wall of the rotation tank 4. In the second rotation step, the washing water moves from the inside to the outside of the rotation tank 4 together with the dirt and the detergent due to the centrifugal force.

That is, as shown in FIG. 6A, when a large amount of laundry is accommodated in the rotary tank 4, there may be a case where the function of tapping and washing can not be obtained sufficiently. In particular, the laundry located in the central portion of the rotation tank 4 not only rotates around the central portion constantly, but also the washing water hardly spreads, so a sufficient cleaning effect can not be obtained. That is, in the case where the dirt attached to the laundry is not a solid and is a water-soluble dirt, etc., although the dirt can be removed only if the washing water passes through the fibers of the laundry, the washing water as described above Can not be expected to have a cleaning effect.

Therefore, in the present embodiment, so-called centrifugal cleaning is performed by the second rotation process in which the laundry in the rotation tank 4 rotates at a speed such that the laundry sticks to the inner circumferential wall of the rotation tank 4. As shown in FIG. 6B, by performing the second rotation step, the washing water moves through the fiber together with the dirt and the detergent component from the inside to the outside of the rotation tank 4 by the centrifugal force. Thereby, the water-soluble dirt etc. which adhered to the laundry located in the central part of the above-mentioned rotation tank 4 can be removed effectively.

By alternately repeating the first rotation step and the second rotation step described above, the rotation tank 4 is selected regardless of the amount of laundry in the rotation tank 4 or the type of dirt attached to the laundry. The entire laundry can be efficiently cleaned.

However, in the second rotation step, in order to obtain the desired centrifugal cleaning effect, it is essential to carry out a plurality of second rotation steps. That is, as shown in FIG. 6B), once the washing water moves from the inside to the outside of the rotary tank 4 by the centrifugal force and passes through the fiber together with the dirt and the detergent component, even if the operation continues as it is There is no transfer of new wash water. That is, since it is necessary to supply wash water to the clothes inside the rotation tank 4 again, it is necessary to carry out the first low speed rotation step and then to carry out the second high speed rotation step again.

However, as shown in FIG. 9A, if the second rotation process is frequently performed, for example, four or five times during the washing process, adverse effects may occur. For example, when the rotary tank 4 is rotated at high speed in a state where the rotary tank 4 is immersed in the water tank 2, there is a concern that the cleaning water in the water tank 2 by the rotary tank 4 may abnormally foam due to the stirring action.

Further, as shown in FIG. 9B, when rotating the rotating tank 4 at a high speed, a balance control process for balancing the rotating tank 4 is required. The frequent execution of the balance control process which does not contribute to the washing effect unnecessarily extends the washing time.

Therefore, the pump 21 is driven in the second rotation step as shown in FIG. 6C instead of performing the second rotation step frequently in the washing step, and the circulation water passage 20, the nozzle water passage 22, and the plurality of The washing water in the water tank 2 is constantly supplied to the laundry stuck to the inner peripheral wall of the rotation tank 4 through the nozzle 26 and the like. Thereby, as shown in FIG. 9C, even when the second rotation process is performed less frequently, for example, once or twice, the second high-speed rotation process is frequently performed without driving the pump 21. An equivalent centrifugal cleaning effect can be obtained. At the same time, it is possible to avoid abnormal foaming due to the stirring action of the rotary tank 4 and unnecessary prolongation of the washing time due to the increase of the balance control time in the second rotation step as described above.

In addition, when the pump 21 is driven with the second rotation process once or twice, if the washing water is not evenly supplied to the entire laundry in the rotating tank 4 by the plurality of nozzles 26, the frequency as described above is low. The effect of the centrifugal washing by the high speed rotation process in the above can not be obtained. That is, if the washing water is not supplied to even part of the laundry stuck to the inner peripheral wall of the rotation tank 4, it is necessary to carry out the first rotation step to again supply the washing water to the laundry. Because there is Since a plurality of nozzles 26 are provided, the washing water supplied to the water tank 2 by the pump 21 is not only attached to a part of the laundry near the nozzles 26 but also attached to the inner circumferential wall in the rotating tank 4 We can continue to supply the whole thing evenly. The details will be described below.

FIG. 7: is a schematic diagram which shows the condition of the laundry in the case of injecting circulating water from one nozzle. FIG. 8 is a schematic view showing the state of the laundry in the case where the circulating water is sprayed from the plurality of nozzles of the drum-type washing machine in the first embodiment of the present invention.

As shown in FIG. 7, when washing water is supplied to the laundry items A to G in the rotary tank 4 from one nozzle a, each laundry item 1 to G has 1 each while the rotary tank 4 makes one rotation. Washing water is supplied only once and sufficient washing is not performed. Therefore, in order to obtain a desired cleaning effect, it is necessary to carry out the second rotation step for a long time, and it is inevitable to prolong the process time and waste power consumption.

Therefore, in the second rotation step, the pump 21 is driven, and the washing water in the water tank 2 is attached to the inner peripheral wall of the rotating tank 4 through the circulating water channel 20, the nozzle water channel 22, the plurality of nozzles 26 and the like. Always supply the whole evenly. Thereby, the above-mentioned subject can be avoided. That is, as shown in FIG. 8, when washing water is supplied from a plurality of nozzles, for example, seven locations of the nozzles a to g to the laundry items A to G in the rotary tank 4, the rotary tank 4 makes one revolution while Each of the laundry items A to G is repeatedly supplied with washing water seven times. That is, since the supply of cleaning water seven times is performed in the same time as in the case where one nozzle 26 is provided, the cleaning effect seven times can be obtained. As a result, even if the process time is 1/7, the same effect can be obtained, so that the process time can be shortened and the power consumption can be reduced.

On the other hand, when the user sets the water level in the water tank 2 higher than the predetermined water level by the water level setting unit (not shown) that sets the water level in the water tank 2, the control unit 32 does not perform the second rotation process. To be. Even if a large amount of laundry is accommodated in the rotary tank 4, if the washing water is widespread in the laundry located at the central portion of the rotary tank 4, that is, if it is immersed in the washing water, the first This is because the cleaning effect can be expected only by the rotation process. Furthermore, when the water level in the water tank 2 is high, there is a concern that the abnormal foaming that occurs when the above-mentioned rotary tank 4 stirs the washing water in the water tank 2 becomes more remarkable. For this reason, when the water level in the water tank 2 is higher than the predetermined water level, the control unit 32 preferably does not perform the second rotation process.

When the predetermined washing time has elapsed, the control unit 32 opens the drain valve 19 to drain the washing water in the water tank 2 through the drain passage 18. After the drainage is completed, rinse water for rinsing is newly supplied to carry out the rinsing step. The operation of the rotary tank 4 in the rinsing step is the same as the washing step. By performing the first rotation step and the second rotation step in the same manner as the washing step in the rinsing step, it is possible to effectively perform the rinsing regardless of the amount of the laundry in the rotation tank 4 or the like.

After the predetermined number of rinse steps, the controller 32 opens the drain valve 19 to drain the rinse water in the water tank 2. Thereafter, the rotary tank 4 is rotated at a high speed to dewater the rinse water contained in the laundry. A dewatering process is performed for a predetermined time to complete the operation. Alternatively, a drying device may be provided and the drying step may be performed following the dewatering step.

As described above, in the drum-type washing machine according to the present embodiment, the washing water is spouted from a plurality of peripheral portions of the opening 6 of the rotation tank 4 to evenly supply the washing water to the laundry in the rotation tank 4 Can. In the step of rotating the laundry in the rotation tank 4 at a speed such that the laundry sticks to the inner peripheral wall of the rotation tank 4, the washing efficiency can be enhanced by spouting the above-described washing water.

As described above, the drum-type washing machine of the present invention includes a water tank for storing washing water, a rotary tank rotatably disposed in the water tank and provided with an opening on the front side, and a motor for driving the rotary tank. A circulating water channel for circulating washing water in the water tank to the rotation tank, a pump for feeding washing water in the water tank to the circulation water channel, and the circulation water channel, and the outer periphery of the opening of the rotation tank is substantially circular And a plurality of nozzles provided in the nozzle channel so as to eject the washing water supplied by the pump toward the inside of the rotary tank, the motor and the pump are driven to perform the washing step. And a control unit. The washing step includes a first rotation step in which the laundry in the rotation tank rotates at a speed not to stick to the inner peripheral wall of the rotation tank, and a speed at which the laundry in the rotation tank sticks to the inner peripheral wall of the rotation tank And a second rotation step of rotating. In the second rotation step, the control unit drives the pump to supply wash water to the laundry stuck to the inner peripheral wall of the rotation tank.

With such a configuration, the washing water supplied into the water tank by the pump continues to be supplied uniformly not only to a part of the laundry in the vicinity of the spout but also to the entire laundry stuck to the inner peripheral wall in the rotating tank. be able to. Here, during the second rotation step, the effect of so-called centrifugal cleaning is obtained, in which the washing water moves with dirt and detergent from the laundry inside the rotary tank toward the laundry outside the rotary tank by centrifugal force. . Therefore, by always supplying the washing water by the pump, the dewatering of the washing water by the centrifugal force and the water absorption by the circulation water (washing water) being applied are repeated, and the effect of the centrifugal washing is further promoted. Be done. As a result, the cleaning performance can be improved.

The drum type washing machine of the present invention further includes a water level setting unit for setting the water level in the water tank. The control unit does not perform the second rotation process when the water level in the water tank is set higher than a predetermined level by the water level setting unit.

With such a configuration, when the water level in the water tank is high and the laundry is sufficiently immersed in the washing water even in the first rotation step, the unnecessary step can be omitted. Also, if the second rotation step is performed when the water level in the water tank is high, abnormal foaming may occur due to the stirring action of the washing water in the water tank due to the rotation, so the risk of occurrence of such problems can be suppressed. .

Further, in the drum-type washing machine of the present invention, a reflective portion for reflecting the washing water spouted from the nozzle to the space portion toward the opening portion is provided in the space portion between the nozzle and the peripheral portion of the opening portion. The reflecting portion has an impact surface inclined with respect to the jet direction of the washing water, and a guide portion provided on the inner peripheral edge to guide the jet flow which has collided with the impact surface into the rotating tank.

With such a configuration, since it is not necessary to directly guide the jet from the nozzle into the rotary tank by the collision surface, the inclination of the collision surface can be set gently with respect to the direction of the jet from the nozzle. Therefore, the jet stream from the nozzle can be more stably landed on the collision surface and diffused. Thereafter, the guide portion guides the jet flow in the direction toward the inside of the rotary tank, so that washing water can be supplied to the laundry in the rotary tank in a stable diffusion state.

Further, in the drum type washing machine of the present invention, the inclination angle of the collision surface with respect to the jet direction of the washing water is set to be gentler than the inclination angle of the guide with respect to the jet direction of the washing water. Further, the length for guiding the washing water in the guide portion is set shorter than the length for guiding the washing water on the collision surface.

With such a configuration, it is possible to minimize the decrease in the flow velocity of the jet in the guide portion, and it is possible to supply the washing water more vigorously to the laundry in the rotary tank, and improve the washing performance and the rinse performance. It can be done.

Moreover, in the drum type washing machine of this invention, it has a bulging part which expanded a part of nozzle channel to the rotating shaft center side of a rotating tank. A circular nozzle hole is provided in a flat portion of the bulging portion. The penetration direction of the nozzle hole is substantially perpendicular to the flat portion, and the length of the nozzle hole is equal to or less than the diameter of the nozzle hole.

With such a configuration, the disturbance of the jet flow ejected from the nozzle can be suppressed, and the direction of the flush water to be ejected can be stabilized. In addition, since the jet flow from the nozzle can be contracted, the flow velocity of the jet can be increased, and the force of the jetted washing water can be strengthened.

Further, in the drum-type washing machine of the present invention, the penetration direction of the nozzle holes is a direction displaced by a predetermined displacement angle from the direction toward the rotation axis of the rotation tank.

With such a configuration, it is possible to expand the range through which the wash water spouted into the rotary tank passes, and it is possible to efficiently and evenly supply the wash water to the laundry in the rotary tank.

As described above, the drum-type washing machine according to the present invention can uniformly supply the washing water to the entire laundry regardless of the amount of laundry in the rotating tank, and can improve the washing efficiency and the rinse efficiency. Because it can, it is useful as a drum type washing machine.

DESCRIPTION OF SYMBOLS 1 case 2 water tank 4

rotation tank

5, 6 opening part 7 door 8 bellows 9 motor 10 rotation axis 11 cylindrical wall 12 protrusion 13 small hole 14 detergent container 15 water supply valve 16 water supply path 17 drainage port 18 drainage path 19 drainage Valve 20 circulating water channel 21

pump

22, 102

nozzle water channel

22b, 103 inner wall surface 23 peripheral edge portion 24 inner peripheral edge portion 25

inlet port

26, 26a, 26b, 26c, 26d, 26e, 26f, 26g, 100 nozzle 27 space portion 28 reflection portion

28a collision surface

28b guide portion 29 bulging portion 30

flat portion

31, 101 nozzle hole 32 control portion

Claims

And a water tank for storing washing water,
A rotary tank rotatably disposed in the water tank and having an opening on the front side;
A motor for driving the rotating tank;
A circulation channel for circulating wash water in the water tank to the rotary tank;
A pump for supplying wash water in the water tank to the circulation channel;
A nozzle water passage communicating with the circulating water passage and provided in a substantially circular shape on the outer side of the peripheral portion of the opening of the rotary tank;
A plurality of nozzles provided in the nozzle channel so as to eject cleaning water supplied by the pump toward the inside of the rotary tank;
And a controller for driving the motor and the pump to perform a washing process.
The washing step is a first rotation step in which the laundry in the rotary tub is rotated at a speed not to stick to the inner peripheral wall of the rotary tub, and the laundry in the rotary tub is the inner peripheral wall of the rotary tub And a second rotation step rotating at a speed enough to stick to the
The control unit is configured to drive the pump to supply the washing water to the laundry stuck to the inner peripheral wall of the rotary tank in the second rotation step. Washing machine.
It further comprises a water level setting unit for setting the water level in the water tank,
The drum type washing machine according to claim 1, wherein the control unit does not perform the second rotation process when the water level in the water tank is set higher than a predetermined level by the water level setting unit.
The space between the nozzle and the peripheral edge of the opening is provided with a reflecting portion for reflecting the washing water spouted from the nozzle to the space toward the opening.
The reflecting portion has a collision surface inclined with respect to the jet direction of the washing water, and a guiding portion provided on the inner peripheral edge to guide the jet flow colliding with the collision surface into the rotary tank. The drum-type washing machine according to Item 1.
The inclination angle of the collision surface to the jetting direction of the washing water is set more gently than the inclination angle of the guiding portion to the jetting direction of the washing water, and the guiding portion guides the washing water at the collision surface. The drum type washing machine according to claim 3, characterized in that the length is set shorter than the lead length.
It has a bulging portion obtained by bulging a part of the nozzle channel toward the rotational axis of the rotary tank, and a circular nozzle hole is provided in a flat portion of the bulging portion, and the penetration direction of the nozzle hole is the flat The drum type washing machine according to claim 1, which is substantially perpendicular to a portion, and a length of the nozzle hole is equal to or less than a diameter of the nozzle hole.
The drum-type washing machine according to claim 5, wherein the penetration direction of the nozzle hole is a direction displaced from the direction toward the rotation axis of the rotation tank by a predetermined displacement angle.