JP2013052123A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine that is capable of evenly supplying washing water to all over the laundry in a rotary tub regardless of the amount of the laundry and exhibits an excellent washing performance.SOLUTION: A drum type washing machine comprises: a circulation water path 20 for circulating washing water in a water tub 2 to a rotary tub 4; a pump 21 for feeding washing water in the water tub 2 to the circulation water path 20; a nozzle 26 for ejecting washing water fed by the pump 21 into the rotary tub 4 through a plurality of parts in a peripheral area of an opening of the rotary tub 4; and a nozzle water path 22 for introducing washing water from the circulation water path 20 to the nozzle 26. A washing process includes: a first rotation process in which the rotary tub is rotated at a speed that does not make the laundry in the rotary tub attached to the inner peripheral wall of the rotary tub 4; a second rotation process in which the rotary tub 4 is rotated at a speed that makes the laundry in the rotary tub 4 attached to the inner peripheral wall of the rotary tub 4, and control means 32 drives the pump 21 in the second rotation process to supply washing water to the laundry attached to the inner peripheral wall of the rotary tub 4.

Description

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

  The conventional drum type washing machine uses less water than the vertical washing machine, and not all the laundry in the aquarium is immersed in the washing water, so the washing water in the aquarium is circulated into the rotating tub by a pump. It gushes into the laundry. (For example, refer to Patent Document 1).

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

JP-A-10-127978

  However, in the conventional configuration, the jet outlet is provided at the upper front side of the rotary tank and the cleaning water is jetted downward, so that the angle is gradually changed in the depth direction of the rotary tank, and a plurality of jets are changed. Even if it ejects from the outlet, there has been a problem that the washing water cannot be uniformly applied to the laundry present at various positions in the rotating tub. In addition, even if the washing water can be uniformly applied in the rotating tub, when a large amount of laundry is accommodated in the rotating tub, the washing water is supplied only to the laundry on the surface near the spout, Washing water is difficult to reach the laundry located inside the laundry lump, and there is a problem that sufficient washing and rinsing effects cannot be obtained.

  The present invention solves the above-described conventional problems, and provides a drum-type washing machine having an excellent cleaning performance by supplying cleaning water evenly to the entire laundry in the rotating tub regardless of the amount of laundry. With the goal.

  In order to solve the above-described conventional problems, a 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 the rotation A motor for driving the tank, a circulating water path for circulating the cleaning water in the water tank to the rotating tank, a pump for feeding the cleaning water in the water tank to the circulating water path, and the cleaning water fed by the pump A washing process is performed by driving a nozzle that ejects water from a plurality of peripheral edge portions of the opening of the rotating tank into the rotating tank, a nozzle water path that guides cleaning water from the circulating water path to the nozzle, the motor, and the pump. Control means, and the washing step includes a first rotation step in which the laundry in the rotating tub rotates at a speed that does not stick to the inner peripheral wall of the rotating tub, and the laundry in the rotating tub The degree of sticking to the inner peripheral wall of the rotating tank A second rotating step that rotates at a speed, and the control means drives the pump in the second rotating step, and the washing water is attached to the laundry stuck to the inner peripheral wall of the rotating tub. Is to supply.

  With such a configuration, the wash water fed into the water tank by the pump continues to be supplied 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 rotary tank. be able to.

  The drum type washing machine of the present invention can supply cleaning water uniformly to the entire laundry regardless of the amount of laundry in the rotating tub, and can improve the cleaning efficiency.

Sectional drawing which shows schematic structure of the washing machine in Embodiment 1 of this invention. Cross section of the main part of the drum type washing machine A view of the drum type washing machine taken along the line AA in FIG. Sectional view of the nozzle of the drum type washing machine Cross section of conventional nozzle The schematic diagram which shows the condition of the laundry in the rotary tub of the drum type washing machine in Embodiment 1 of this invention. Schematic showing the condition of laundry when circulating water is jetted from one nozzle The schematic diagram which shows the condition of the laundry in the case of injecting circulating water from the several nozzle of the drum type washing machine in Embodiment 1 of this invention Time chart showing the operation of the washing process of the drum type washing machine

  A washing machine according to a first aspect of the present invention includes a water tank for storing cleaning water, a rotating tank that is rotatably disposed in the water tank and provided with an opening on the front side, a motor that drives the rotating tank, and the water tank A circulating water channel for circulating the cleaning water to the rotating tank, a pump for supplying the cleaning water in the water tank to the circulating water channel, and a plurality of peripheral portions of the opening of the rotating tank for supplying the cleaning water supplied by the pump A nozzle that ejects water into the rotary tank, a nozzle water channel that guides cleaning water from the circulation water channel to the nozzle, and a controller that drives the motor and the pump to perform a washing process, A first rotating step in which the laundry in the rotating tub rotates at a speed that does not stick to the inner peripheral wall of the rotating tub; and the laundry in the rotating tub sticks to the inner peripheral wall of the rotating tub. A second rotation process that rotates at a speed. , Wherein, in said second rotation step, by driving the pump, in which so as to supply the washing water to the laundry stuck to the inner peripheral wall of the rotating tub.

  With such a configuration, the wash water fed into the water tank by the pump continues to be supplied 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 rotary tank. be able to. Here, during the second rotation step, a so-called centrifugal force cleaning effect is obtained in which the washing water moves together with dirt and detergent from the laundry inside the rotating tub to the laundry outside the rotating tub by centrifugal force. . Therefore, by always supplying cleaning water with the pump, dehydration of cleaning water by centrifugal force and water absorption by applying circulating water (washing water) are repeated, and the effect of centrifugal cleaning is further promoted. Is done. As a result, the cleaning performance can be improved.

  According to a second aspect of the invention, in particular, the washing machine of the first aspect of the invention further includes a water level setting means for setting a water level in the water tank, and the control means is configured such that the water level in the water tank is higher than a predetermined level by the water level setting means. When set, the second rotation process is not performed.

  With such a configuration, an unnecessary step can be omitted when the water level in the water tank is high and the laundry is sufficiently immersed in the wash water even in the first rotation step. In addition, 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 cleaning water in the water tank due to rotation, so the risk of occurrence of such problems can be suppressed. .

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

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a schematic structure of a washing machine according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of a main part of the drum type washing machine in the first embodiment of the present invention. FIG. 3 is a view of the drum type washing machine according to the first embodiment of the present invention taken along the line AA in FIG. 1. FIG. 4 is a sectional view of the nozzle of the drum type washing machine in the first embodiment of the present invention.

  1 to 4, a water tank 2 formed in a bottomed cylindrical shape is elastically supported in a housing 1. A rotating tank 4 formed in a bottomed cylindrical shape is disposed in the water tank 2 so as to be rotatable. The rotation axis 10 of the rotating tub 4 substantially coincides with the cylindrical center line of the rotating tub 4, and this substantially coincides with the cylindrical center line of the water tub 2. The water tank 2 and the rotating tank 4 are each provided with openings 5 and 6 on the front side. With the opening 5 side of the water tank 2 being the front side of the housing 1, the rotation axis 10 of the rotating tank 4 is supported by being inclined upward (for example, 10 to 20 degrees) from the horizontal direction. When the rotation axis 10 is inclined upward, a deep water storage state can be obtained with a small amount of water, and water saving can be improved. However, the rotation axis 10 may be horizontal if water saving is not taken into consideration.

  Opposite to the opening 5 of the water tank 2 and the opening 6 of the rotating tank 4, a door body 7 that can be opened and closed is provided on the front surface of the housing 1. The user can put the laundry in and out of the rotating tub 4 by opening the door body 7. A flexible bellows 8 formed of an elastic body such as rubber is disposed around the opening 5 of the water tank 2. When the door body 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 body 7 are sealed.

  A motor 9 that rotationally drives the rotating tub 4 is attached to the end surface of the water tub 2 opposite to the opening 5. The rotor of the motor 9 is connected to the rotating tub 4 by the rotating shaft center 10 of the rotating tub 4, and the rotation of the motor 9 is transmitted to the rotating tub 4 by the rotating shaft 10. A plurality of protrusions 12 are provided on the peripheral wall of the rotating tub 4 so as to protrude toward the rotation axis 10. As the rotating tub 4 rotates, the laundry is hooked by the protrusion 12 and lifted upward, and a stirring operation is performed in which the laundry is dropped from a certain height.

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

  Above the water tank 2, a detergent container 14 for storing detergent is provided. The detergent container 14 is connected to a water supply valve 15 connected to a water tap, and the supply and stop of the tap water to the detergent container 14 is performed by opening and closing the water supply valve 15. A water supply path 16 is provided below the detergent container 14 to guide the water introduced into the detergent container 14 into the water tank 2 together with the detergent.

  Below the water tank 2, a drain port 17 for discharging the cleaning water in the water tank 2 is provided, and a drain path 18 for guiding the cleaning water discharged from the drain port 17 to the outside of the housing 1 is provided. Yes. A drain valve 19 that opens and closes the drain path 18 is provided in the middle of the drain path 18.

  A circulation water channel 20 through which the washing water discharged from the water tank 2 passes through the rotary tank 4 and is led again into the water tank 2 is connected to the drain port 17, and is branched from the drain path 18. . The circulating water channel 20 is arranged substantially horizontally below the water tank 2 from the lower rear part of the water tank 2 toward the front. A pump 21 is provided in the middle of the circulation channel 20. When the pump 21 is driven, the wash water in the water tank 2 is drawn into the circulation channel 20 from the drain port 17, and the wash water flowing into the circulation channel 20 is added. The water can be supplied to the rotating tank 4 and can be circulated to the water tank 2 through the circulation water channel 20.

  Inside the front part of the water tank 2, a nozzle water channel 22 is provided on the outer peripheral side of the circular opening part 5 provided in the water tank 2 when viewed from the opening part 6 side of the rotating tank 4. The nozzle water channel 22 is provided in a substantially circular shape outside the peripheral edge 23 of the opening 6 provided in a circular shape in the rotating tub 4. The opening 5 provided in the water tank 2, the opening 6 provided in the rotating tank 4, and the nozzle water channel 22 are formed in a substantially concentric shape, and the inner peripheral edge 24 of the nozzle water channel 22 is formed from the peripheral edge 23 of the opening 6. Located radially outside.

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

  A space 27 is provided between the nozzle 26 and the peripheral edge 23 of the opening 6. The space portion 27 is provided with a reflection portion 28 that reflects the cleaning water ejected from the nozzle 26 into the space portion 27 toward the opening 6. The reflection unit 28 is configured to guide the cleaning water sprayed into the space 27 to the opening 6 and introduce it into the rotating tub 4. The plurality of nozzles 26 (26 a to 26 g) are formed at positions away from the peripheral edge 23 of the opening 6 of the rotating tub 4, so that the nozzle 26 is not exposed to the opening 6 of the rotating tub 4. It is possible to pour the diffused washing water on the laundry in 4, and when the laundry is put into the rotating tub 4 or taken out, the laundry is not caught by the opening 6 and is not damaged. It is easy to put in and out and can improve usability.

  There is no water guide wall surface or the like for guiding the jet flow ejected from the nozzle 26 to the reflection portion 28, and the jet flow from the nozzle 26 is discharged into the space portion 27 and then collides with the collision surface 28 a of the reflection portion 28. The jet flow from the nozzle 26 is configured to be guided into the rotary tank 4 from the opening 6 of the rotary tank 4 while diffusing. For this reason, even if the nozzle 26 is formed at a position away from the peripheral side portion of the opening 6 of the rotating tank 4, the jet flow from the nozzle 26 is guided into the rotating tank 4 without receiving unnecessary wall resistance. . With such a configuration, the decrease in the flow rate is minimized, and the washing water can be vigorously supplied to the laundry in the rotating tub 4.

  Further, since the nozzle 26 does not need to have a flat shape so as to follow the water guide wall surface, the nozzle 26 has a round hole shape with the smallest pressure loss as long as it has the same cross-sectional area. Thereby, the flow volume fall of the washing water ejected from the nozzle 26 can be suppressed to the minimum, and a sufficient amount of washing water can be supplied to the laundry in the rotating tub 4. Moreover, since the bar-shaped jet is diffused by the reflecting portion 28, the washing water in the rotating tub 4 can be poured over a wide range, and the washing performance and the rinsing performance can be improved.

  The reflecting portion 28 is arranged in an annular shape around the opening portion 5 so as to face the front surface portion of the rotating tub 4, and the collision surface 28 a on which the washing water ejected from the nozzle 26 collides is formed in the direction of jet flow from the nozzle 26. It is inclined and provided. Thereby, the jet flow from the nozzle 26 can be stably landed without being scattered in multiple directions on the collision surface 28a, and can be diffused while flowing along the inclined surface. On the other hand, the washing water can be supplied in a stable diffusion state.

  The gentler the inclination angle of the collision surface 28a with respect to the jet flow direction from the nozzle 26, the more stable the jet flow can be landed and diffused. However, in the case where the reflecting portion 28 is configured only by the collision surface 28 a, the jet flow can be guided toward the inner back direction of the rotating tank 4 if the inclination angle of the collision surface 28 a with respect to the ejection direction from the nozzle 26 is gentle. This is not possible, and the washing water is supplied only to the clothing in front of the rotary tub 4.

  In view of this, the reflecting portion 28 is provided with a guide portion 28b on the inner peripheral edge thereof for guiding the jet flow from the nozzle 26 to the inner surface of the rotary tank 4 after colliding with the collision surface 28a. The collision surface 28a is inclined more gently than the guide portion 28b with respect to the jet flow direction from the nozzle 26. Thereby, the inclination of the collision surface 28a can be set gently with respect to the direction of the jet from the nozzle 26 irrespective of the direction for guiding the jet from the nozzle 26 into the rotary tank 4, and more stably. Jets can land and diffuse. Then, since it guides with the guide part 28b in the direction which turned into the inside of the rotating tub 4, it can supply washing water with respect to the laundry in the rotating tub 4 in the stable diffusion state.

  Further, in the reflecting portion 28, the length for guiding the cleaning water by the guide portion 28b is shorter than the length for guiding the cleaning water by the collision surface 28a. In order to stably land and diffuse the jet flow ejected from the nozzle 26 on the collision surface 28a, the distance that the jet flow contacts the collision surface 28a needs to be longer than the collision range of the jet flow. is there. On the other hand, since the guide portion 28b has a function of only changing the direction of the jet, it is sufficient to make the guide portion 28b contact shorter than the collision surface 28a. Thereby, the flow velocity reduction in the guide part 28b can be suppressed to the minimum, the washing water can be more vigorously supplied to the laundry in the rotating tub 4, and the washing performance and the rinsing performance can be improved. it can.

  The wash water fed by the pump 21 becomes a rod-like jet from a plurality of nozzles 26 a to 26 g provided in the nozzle water channel 22 and is jetted to the rotary axis 10 side. The washing water spouted into the space 27 collides with the collision surface 28a of the reflecting portion 28, is reflected toward the opening 6 of the rotating tub 4, is diffused in the rotating direction of the rotating tub 4, and is guided by the guide portion 28b. From the vicinity of the peripheral edge portion 23 of the opening 6, it is ejected into the rotary tank 4.

  A plurality of nozzles 26 are provided in the nozzle water passage 22 provided in a substantially circular shape outside the peripheral edge portion 23 of the opening 6, and the direction in which all the washing water is ejected from the direction toward the rotation axis 10 of the rotary tank 4 is provided. When viewed from the opening surface side of the rotating tub 4, it is displaced in the same direction by a predetermined displacement angle (shift angle) θ1. The displacement angle (shift angle) θ1 of the nozzles 26a to 26g is set to the same angle.

  Thereby, the range through which the washing water spouted into the rotating tub 4 passes can be expanded, and the laundry in the rotating tub 4 can be continuously and efficiently supplied to the laundry. If the displacement angle (shift angle) is too large, a portion where the cleaning water does not pass is generated in the vicinity of the rotation axis 10. The displacement angle (shift angle) θ1 for displacing the washing water ejection direction (i) with respect to the shaft center 10 is half of the spread angle θ2 (for example, 10 to 30 degrees) of the washing water diffused in the rotation direction of the rotating tank 4. It is preferable to set the degree (for example, 5 to 15 degrees).

  The nozzle 26 is provided with a bulging portion 29 in which a part of the nozzle water channel 22 is bulged toward the rotation axis 10 of the rotating tub 4, and a circular nozzle hole 31 is provided in the flat portion 30 of the bulging portion 29. In the nozzle hole 31, the length L of the nozzle hole 31 is set to be equal to or smaller than the diameter d of the nozzle hole 31. The flat surface portion 30 is orthogonal to the direction in which the washing water is ejected from the nozzle hole 31 and is inclined at a displacement angle (shift angle) θ1 of the nozzle 26.

  Since the inside of the bulging portion 29 is isolated from the main flow (dotted arrow) of the cleaning water flowing through the nozzle water passage 22 to the end portion 22a, the nozzles 26 (26a to 26g) are not easily affected by the main flow of the cleaning water. . For this reason, it is possible to suppress turbulence of the jet flow ejected from the nozzles 26 (26a to 26g), and to stabilize the direction of the wash water ejected. Moreover, since the jet flow from this nozzle 26 (26a-26g) can be shrunk, the flow rate can be increased and the momentum of the wash water ejected can be increased.

  This will be described in detail. FIG. 5 is a cross-sectional view of a conventional nozzle. As shown in FIG. 5, the nozzle 100 is normally formed so that the inner wall surface 103 of the nozzle water channel 102 gradually becomes smaller toward the nozzle hole 101 in order to minimize pressure loss. This prevents the turbulent flow by preventing the water flow in the nozzle water channel 102 from separating from the inner wall surface 103 until immediately before the jet stream is ejected from the nozzle hole 101, thereby configuring an efficient nozzle 100. In such a nozzle 100, the flow velocity of the jet from the nozzle hole 101 is determined by the cross-sectional area of the nozzle hole 101 if the flow rate of the jet 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, if the circulation flow rate of the circulation water channel 20 for supplying the cleaning water to the nozzle water channel 22 is increased, the water level in the water tank 2 is lowered and air is easily mixed into the pump 21, so-called air-engaged state, and conversely the flow rate is increased. There is a problem of lowering. For this reason, when washing is performed by reducing the amount of water stored in the water tank 2, there is a limit to the increase in the flow rate circulating in the circulation channel 20. In addition, if the cross-sectional area of the nozzle hole 31 is reduced, reliability problems such as clogging of waste yarn generated from the laundry occur, and there is a limit to reducing the cross-sectional area of the nozzle hole 31.

  Therefore, in the present invention, as shown in FIG. 4, a bulging portion 29 bulged toward the rotation axis 10 side of the rotating tub 4 is provided in the nozzle water passage 22, and the nozzle hole 31 is surrounded by the penetrating direction of the nozzle hole 31. A substantially vertical plane portion 30 is provided. The flow in the vicinity of the inner wall surface 22b in the nozzle water channel 22 created by the bulging portion 29 tends to flow along the inner wall surface 22b due to the viscosity of the fluid, but when ejected as a jet from the nozzle hole 31, the inner wall surface 22b Since it suddenly bends about 90 degrees, the flow is separated from the peripheral wall of the nozzle hole 31.

  Therefore, as shown in FIG. 4, the cross-sectional area B of the jet is smaller than the cross-sectional area C of the nozzle hole 31, that is, contracts. Thereby, even if the flow volume of the nozzle 26 of this invention is the same and the cross-sectional area of the nozzle hole 31 is the same, a flow rate can be accelerated rather than a normal thing, and the momentum of the washing water ejected from the nozzle 26 is strengthened. be able to.

  Further, the nozzle hole 31 is circular in the shape of the EE cross section of FIG. Thereby, since the jet stream is uniformly contracted, turbulence of the jet stream from the nozzle hole 31 can be suppressed, and the washing water can be jetted in the set direction and applied to the laundry. Further, since the nozzle hole 31 has no corners, the lint generated from the laundry is not easily caught in the nozzle hole 31, and the clogging due to the lint can be prevented.

  Further, the nozzle hole 31 has a length L of the nozzle hole 31 equal to or smaller than the diameter d of the nozzle hole 31. If the nozzle hole 31 is too long in the ejection direction, the flow once peeled from the peripheral wall of the nozzle hole 31 and contracted gradually spreads and ejects, and the effect of increasing the flow velocity is lost. The length L is preferably about equal to or less than the diameter d of the nozzle hole, and the flow velocity of the jet flow from the nozzle hole 31 can be reliably increased, so that the momentum of the wash water to be ejected can be reliably increased.

  Moreover, the nozzle water channel 22 is branched from the inflow port 25 in two directions, and is configured to extend toward the end 22a. 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 formed in an annular shape so as to surround the opening 5, the flow path can be shortened. The pressure loss of the path can be reduced. Therefore, sufficient pressure can be applied to each nozzle 26a-26g, the flow velocity of the jet flow ejected from the nozzle 26 can be ensured, and washing water can be uniformly applied to the laundry in the rotating tub 4. . The nozzle water channel 22 is the same because it is branched in two directions from the inflow port 25 even in a ring-shaped configuration without the end 22a.

  In addition, the direction in which the cleaning water flows from the inlet 25 into the nozzle water channel 22 is configured to be the direction of the rotation axis 10 of the rotating tub 4 (arrow D). For this reason, the flow of the washing water in two directions can be smoothly branched, sufficient pressure can be applied to each of the nozzles 26a to 26g, and the flow velocity of the jet flow ejected from the nozzle 26 can be ensured. it can.

  Control means for controlling the motor 9, the water supply valve 15, the drain valve 19, the pump 21, and the like in the lower rear part in the housing 1 and controlling the operations of washing, rinsing and dehydration processes based on a set program. 32 is provided.

  Hereinafter, the operation and action of the drum type washing machine configured as described above will be described. FIG. 6 is a schematic diagram showing a situation of the laundry in the rotating tub of the drum type washing machine in the first embodiment of the present invention. FIG. 9 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.

  When the user opens the door body 7 and puts the laundry into the rotating tub 4 and starts operation, the control means 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 into the water tank 2 from the water supply path 16.

  Wash water stored in the water tank 2 is detected by a water level detection means (not shown). When the amount of water set according to the amount of laundry is stored, the control means 32 stops water supply and starts washing. The rotating tub 4 is driven to rotate forward and backward by a motor 9, and the laundry accommodated in the rotating tub 4 is lifted in the rotation direction by the protrusions 12 provided on the cylindrical wall 11 of the rotating tub 4 and then dropped. The laundry is washed by the action of tapping.

  The water level of the washing water is set such that the distance at which the laundry falls to the washing water so that the effect of tapping washing can be obtained, and the washing water is stored to the lower side in the rotating tub 4. However, in a state where the water level in the water tank 2 is low, the washing water is difficult to reach the entire laundry. For this reason, when the pump 21 is operated so as to drop the washing water into the laundry in the rotating tub 4, the washing water in the tub 2 is drawn into the circulation channel 20 from the drain 17 provided at the bottom of the tub 2. .

  The wash water fed from the circulation water channel 20 to the nozzle water channel 22 through the inlet 25 is branched in two directions toward the end 22a formed in a long ring shape, and a plurality of nozzles 26 (26a to 26a-26) provided at equal intervals. 26 g) and sprayed into the rotary tank 4 while being diffused. At the time of washing and rinsing, the pump 21 is operated to circulate the washing water in the water tub 2, and the washing water is evenly applied to the laundry.

  The plurality of nozzles 26 (26a to 26g) are displaced in the same direction from the direction toward the rotation axis 10 of the rotating tub 4 when the washing water ejection direction A is viewed from the opening surface side of the rotating tub 4. Since the displacement is performed at the angle (shift angle) θ1, the range in which the cleaning water fed into the water tank 2 by the pump 21 is ejected into the rotary tank 4 can be expanded.

  In addition, the plurality of nozzles 26 (26a to 26g) have the same angle (shifted) from the direction toward the rotation axis 10 of the rotating tub 4 as viewed from the opening surface side of the rotating tub 4 in the ejection direction of the washing water. Since the angle is changed by θ1, it is possible to evenly expand the range of the jetted water into the rotating tub 4 and to wash the laundry that is being stirred and moved in the rotating tub 4. Can be increased, and the washing water can be continuously supplied to the entire laundry in the rotating tub 4.

  Further, at least one or more nozzles 26 g of the plurality of nozzles 26 are configured to eject cleaning water from the vicinity of the upper end of the peripheral edge portion 23 of the opening 6 of the rotating tank 4 toward the rotating tank 4. For this reason, washing water can be poured from the vicinity of the uppermost point of the laundry, and the washing water supplied to the upper laundry is also supplied to the lower laundry in the process of flowing downward due to gravity. The washing water can be efficiently and uniformly supplied to the entire laundry.

  In the washing process of the drum type washing machine, the above-described tapping washing is performed by the first rotation process in which the laundry in the rotating tub 4 does not stick to the inner peripheral wall of the rotating tub 4, for example, 45 r / min. The action is main. However, depending on the amount of laundry, the type of dirt, etc., in the second rotating step where the laundry in the rotating tub 4 sticks to the inner peripheral wall of the rotating tub 4, for example, 100 r / min, the centrifugal force Thus, a so-called centrifugal force cleaning action in which the cleaning water moves together with dirt and detergent from the inner side to the outer side of the rotary tank 4 is effective.

  That is, as shown in FIG. 6A, when a large amount of laundry is accommodated in the rotating tub 4, there is a case where the action of tapping is not sufficiently obtained. In particular, the laundry located in the central portion of the rotating tub 4 not only always rotates around the central portion, but also the washing water hardly spreads, so that a sufficient cleaning effect cannot be obtained. In other words, if the dirt adhering to the laundry is not solid but water-soluble, the washing water can be removed as described above, even though the washing water can be removed only by passing through the fibers of the laundry. If it does not spread, cleaning effect cannot be expected.

  Therefore, in the present embodiment, a second rotation process is performed in which the laundry in the rotating tub 4 rotates at a speed at which the laundry sticks to the inner peripheral wall of the rotating tub 4. As shown in FIG.6 (b), by performing a 2nd rotation process, washing water moves through a fiber with dirt and a detergent part from the inside of rotation tank 4 to the outside by centrifugal force, By so-called centrifugal cleaning, water-soluble stains and the like attached to the laundry located in the central portion of the rotating tub 4 can be effectively removed.

  By alternately repeating the first rotation process and the second rotation process described above, the rotation tank 4 can be used regardless of the amount of laundry in the rotation tank 4 and the type of dirt attached to the laundry. The entire laundry can be efficiently washed.

  However, in order to obtain a desired centrifugal force cleaning effect in the second rotation step, it is indispensable to perform the second rotation step a plurality of times. That is, as shown in FIG. 6B, once the washing water moves through the fibers together with dirt and detergent from the inside of the rotating tub 4 to the outside by centrifugal force, even if the operation is continued as it is, No further washing water movement occurs. That is, since it is necessary to supply washing water to the clothes inside the rotating tub 4 again, it is necessary to perform the first low-speed rotation process and then perform the second high-speed rotation process again.

  However, as shown in FIG. 9 (a), if the second rotation step is frequently performed, for example, four or five times during the washing step, there may be a case where an adverse effect occurs. For example, if the rotating tank 4 is rotated at a high speed while the rotating tank 4 is immersed in the water tank 2, there is a concern that the cleaning water in the water tank 2 by the rotating tank 4 is abnormally foamed due to the stirring action.

  Moreover, as shown in FIG.9 (b), when rotating the rotation tank 4 at high speed, the balance control process for balancing the rotation tank 4 is required, and the balance control process which does not contribute to the washing | cleaning effect is frequent. Doing in is an unnecessary extension of washing time.

  Therefore, instead of frequently performing the second rotation process during the washing process, as shown in FIG. 6C, in the second rotation process, the pump 21 is driven, and the circulation water channel 20 and the nozzle water channel 22 are driven. The washing water in the water tub 2 is always supplied to the laundry stuck to the inner peripheral wall of the rotating tub 4 through the plurality of nozzles 26 and the like. As a result, as shown in FIG. 9C, the centrifugal cleaning effect equivalent to the case where the second high-speed rotation process is carried out at a low frequency, for example, once or twice, without driving the pump 21, is performed. Is obtained. At the same time, in the second rotation process as described above, it is possible to avoid abnormal foaming due to the stirring action of the rotating tank 4 and unnecessary extension of the washing time due to an increase in the balance control time.

  In addition, when the pump 21 is driven with the second rotation step 1 or 2 times, if the washing water is not uniformly supplied to the entire laundry in the rotating tub 4 by the plurality of nozzles 26, the frequency as described above is low. The effect of centrifugal force washing by the high-speed rotation process in can not be obtained. That is, if the washing water is not supplied even to a part of the laundry stuck to the inner peripheral wall of the rotating tub 4, it is necessary to perform the first rotation process in order to supply the washing water to the laundry again. Because there is. Since a plurality of nozzles 26 are provided, the washing water fed into the water tub 2 by the pump 21 is not only applied to a part of the laundry in the vicinity of the nozzles 26, but also washed on the inner peripheral wall in the rotating tub 4. We can continue to supply the whole thing evenly. Details will be described below.

  FIG. 7 is a schematic diagram showing the state of the laundry when circulating water is jetted from one nozzle. FIG. 8 is a schematic diagram showing the state of the laundry when the circulating water is jetted from a plurality of nozzles of the drum type washing machine in the first embodiment of the present invention.

  As shown in FIG. 7, when rinsing water is supplied from one nozzle a to the laundry A to G in the rotating tub 4, each of the laundry A to G is performed once while the rotating tub 4 rotates once. However, water absorption and dehydration of rinse water, that is, removal of detergent is not performed. Therefore, in order to obtain a desired rinsing effect, it is necessary to carry out the second rotation process for a long time, and it is inevitable that the process time is prolonged and power consumption is wasted.

  Therefore, in the second rotation process, the pump 21 is driven, and the washing water in the water tank 2 is attached to the inner peripheral wall of the rotation tank 4 through the circulation water channel 20, the nozzle water channel 22, the plurality of nozzles 26, and the like. Always supply the entire product evenly. Thereby, the above-mentioned subject can be avoided. That is, as shown in FIG. 8, when rinsing water is supplied from a plurality of nozzles, for example, nozzles a to g, to the laundry A to G in the rotating tub 4, while the rotating tub 4 makes one rotation, Each of the laundry items A to G repeatedly absorbs and dehydrates rinse water seven times. That is, since the detergent is removed seven times in the same time as compared with the case where the nozzle 26 is provided at one place, the rinsing effect can be obtained seven times. As a result, even if the process time is reduced to 1/7, the same effect is exhibited, 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 a predetermined water level by a water level setting means (not shown) for setting the water level in the water tank 2, the control means 32 does not perform the second rotation process. I will do it. Even when a large amount of laundry is stored in the rotating tub 4, if the washing water is spread over the laundry located in the center of the rotating tub 4, that is, if the washing water is immersed in the washing water, the first This is because a 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 abnormal foaming caused by the above-described rotating tank 4 stirring the washing water in the water tank 2 may become more prominent, so the water level in the water tank 2 is a predetermined water level. If it is higher, it is preferable that the control means 32 not perform the second rotation process.

  When a predetermined washing time has elapsed, the control means 32 opens the drain valve 19 and drains the washing water in the water tank 2 through the drainage path 18. After draining is finished, rinse water for rinsing is newly supplied, and the rinsing process is executed. The operation of the rotating tank 4 in the rinsing process is the same as that in the washing process. Even in the rinsing process, the first rotating process and the second rotating process are performed in the same manner as the washing process, so that the rinsing can be effectively performed regardless of the amount of laundry in the rotating tub 4.

  When the predetermined number of rinsing steps are completed, the control means 32 opens the drain valve 19 to drain the rinse water in the water tank 2. Thereafter, the rotating tub 4 is rotated at a high speed to dehydrate the rinse water contained in the laundry, and a dehydration step is performed for a predetermined time to complete the operation. Or you may make it provide a drying apparatus and perform a drying process following a dehydration process.

  As described above, the drum-type washing machine of the present invention can evenly supply cleaning water to the laundry in the rotating tub 4 by ejecting the cleaning water from a plurality of peripheral portions of the opening 6 of the rotating tub 4. . In the process of rotating at a speed at which the laundry in the rotating tub 4 sticks to the inner peripheral wall of the rotating tub 4, the cleaning efficiency can be increased by ejecting the above-described cleaning water.

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

DESCRIPTION OF SYMBOLS 1 Case 2 Water tank 4 Rotating tank 5, 6 Opening part 7 Door body 8 Bellows 9 Motor 10 Rotation center 11 Cylindrical wall 12 Projection body 13 Small hole 14 Detergent container 15 Water supply valve 16 Water supply path 17 Drain port 18 Drain path 19 Drain Valve 20 Circulating water channel 21 Pump 22 Nozzle water channel 25 Inlet 26, 26a, 26b, 26c, 26d, 26e, 26f, 26g Nozzle 27 Space portion 28 Reflecting portion 28a Colliding surface 31 Nozzle hole 100 Nozzle 101 Nozzle hole 102 Nozzle water passage 103 Wall

Claims (2)

A water tank for storing washing water;
A rotating tank that is rotatably arranged in the water tank and has an opening on the front side;
A motor for driving the rotating tank;
A circulation channel for circulating the wash water in the water tank to the rotating tank;
A pump for feeding the wash water in the water tank to the circulation channel;
A nozzle that ejects cleaning water fed by the pump from a plurality of peripheral portions of the opening of the rotating tank into the rotating tank;
A nozzle channel that guides wash water from the circulation channel to the nozzle;
A control means for driving the motor and the pump to perform a washing process;
The washing step includes a first rotating step in which the laundry in the rotating tub rotates at a speed that does not stick to the inner peripheral wall of the rotating tub, and the laundry in the rotating tub is an inner peripheral wall of the rotating tub. A second rotating step that rotates at a speed that sticks to
In the second rotating step, the control means drives the pump to supply the washing water to the laundry attached to the inner peripheral wall of the rotating tub. Washing machine. Water level setting means for setting the water level in the water tank,
The drum type washing machine according to claim 1, wherein the control means does not perform the second rotating step when the water level in the water tank is set higher than a predetermined level by the water level setting means.

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