Washing method for washing machine and a washing machine

Abstract

A washing machine contains a wash tub, an impeller and a motor. Clothing is put into the tub and the load is detected. Water is added until the water level is below or equal to load height. To begin washing, the impeller drives the clothing to overturn, resulting in generating three types of water flows: agitating flow, enhancing flow and balancing flow. At first, the agitating flow breaks the balance of the load to disperse clothing, then the enhancing flow overturns clothing for washing. Finally, the balancing flow maintains the circulation path for the load balance overturning. Single sequential control or repeatedly alternating cycle control of the three types of water flows can be adopted for washing. The invention can save water, improve washing efficiency and avoid intertwining of clothing, characterized by full-range, thorough, repeated and efficient washing.

Claims

1. A washing machine comprising: a washing tub; and an impeller and a motor, the impeller comprising an impeller disk and a water spinning blade arranged on a surface of the impeller disk, the impeller disk being of basin-shaped structure with a bulge on a center of the impeller disk, the water spinning blade extending from the center of the impeller disk to an edge of the impeller disk, and the water spinning blade comprising at least a first convex rib and a second convex rib which incline to two sides of the water spinning blade in an extension direction of the water spinning blade respectively to form a twisted structure of the water spinning blade, wherein, in the extension direction from the center of the impeller disk to the edge of the impeller disk, an upper surface of the water spinning blade at first rises to a maximum height, then falls to a minimum height and finally rises to realize a smooth transition with an inner circumferential wall of the basin-shaped impeller disk, a height difference between the maximum height and the minimum height of the water spinning blade is 1-1.5 times a depth of the impeller disk, a height difference between the maximum height of the water spinning blade and the center of the impeller disk is 0-0.2 times the depth of the impeller disk, and a position of smooth transition between the water spinning blade and the inner circumferential wall of the impeller disk is located on - of the impeller disk depth.

2. The washing machine according to claim 1, wherein: the water spinning blade is of curved shape in the extension direction, and the water spinning blade has at least two convex ribs with different rates of curve or slope projected on the surface of the impeller disk, or, the water spinning blade at least comprises a curved convex rib.

3. The washing machine according to claim 1, wherein: the water spinning blade comprises the first convex rib close to the center of the impeller disk and the second convex rib close to the edge of the impeller disk, the first convex rib and the second convex rib incline to the surface of the impeller disk on different sides respectively, a slope angle between the first convex rib or the second convex rib and the surface the impeller disk are greater than or equal to 55, and a smooth transition is formed between both sides of the water spinning blade and the surface of the impeller disk.

4. The washing machine according to claim 3, wherein a projection of the first convex rib and the second convex rib on the surface of the impeller disk is a profile of two arches including a first arch and a second arch, wherein a center of curvature of the first arch is located on one of the two sides of the water spinning blade in the extension direction of the water spinning blade, and a center of curvature of the second arch is located on the other one of the two sides of the water spinning blade in the extension direction.

5. The washing machine according to claim 4, wherein a central angle between two ends of the water spinning blade is in the range 15-90.

6. The washing machine according to claim 5, wherein a central angle between two ends of the water spinning blade is in the range 30-60.

7. The washing machine according to claim 3, wherein: a slope angle between the first convex rib and the surface of the impeller disk is an amount ranging from 80 to 85; and a slope angle between the second convex rib and the surface of the impeller disk is an amount ranging from 75 to 80.

8. The washing machine according to claim 1, wherein: the height difference between the maximum height of the water spinning blade and the center of the impeller disk is 0.1 times the depth of the impeller disk.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of center-upward overturn trace of the clothing for washing machine in the invention;

(2) FIG. 2 is a schematic diagram of outward overturn state of the clothing for washing machine in the invention;

(3) FIG. 3 is a schematic diagram of up-down cycle overturn trace of the clothing for washing machine in the invention;

(4) FIG. 4 is a structure diagram of the impeller in the invention;

(5) FIG. 5 is a schematic diagram of cross-section structure of the impeller in the invention;

(6) FIG. 6 is a sequence diagram of rotation-stop ratios corresponding to water flows during the first load washing for washing machine in the invention;

(7) FIG. 7 is a sequence diagram of rotation-stop ratios corresponding to water flows during the second and third load washing for washing machine in the invention;

(8) FIG. 8 is a sequence diagram of dewatering and drainage in drainage stage during rinsing and during dewatering.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(9) A washing machine in the invention contains a wash tub, a rotatable impeller and a motor. The motor drives the impeller to realize forward and reverse rotation during washing. According to FIG. 3 and FIG. 4, the impeller 1 contains an impeller disk 2 and multiple groups of water spinning blades 3 arranged on the surface of the impeller disk. In this embodiment, three groups of water spinning blades are used, or, four or five groups can be used as well. The impeller disk 2 is of basin-shaped structure with a bulge on the center. The edge of the basin-shaped structure is an inner circumferential wall 4 extending upwardly. Each group of water spinning blades 3 extends toward the edge from the center 5 of the impeller disk. The water spinning blade 3 mainly consists of at least two convex ribs which incline to both sides in extension direction of the water spinning blade respectively to form twisted structure of the water spinning blade.

(10) Furthermore, the water spinning blade 3 is of linear or curved shape in extension direction. when the water spinning blade is of curved shape in extension direction, the water spinning blade have at least two convex ribs with rates of curve or slope projected on the surface of the impeller disk being different. Or, the water spinning blade at least consists of curved convex rib and linear convex rib.

Embodiment 1

(11) Shown as FIG. 3, in this embodiment, the water spinning blade 3 contains a first convex rib 31 close to the center of the impeller disk 5 and a second convex rib 32 close to the edge of the impeller disk. T The first convex rib and the second convex rib incline to the surface of the impeller disk on different sides respectively. Slope angle between the first convex rib 31 and a vertical surface is within 5-10. The vertical surface is perpendicular to the surface of the impeller disk on the intersection between the water spinning blade and the surface of the impeller disk and the inclination direction is clockwise rotation direction of the impeller. Slope angle between the second convex rib 32 and the vertical surface is within 10-15, and the inclination direction is clockwise rotation direction of the impeller (referred to FIG. 3). Both sides of the water spinning blade 3 realize smooth transition with the impeller disk surface. Projections of the first convex rib 31 and the second convex rib 32 on the surface of the impeller disk are two arches whose centers of circle are on both sides of the water spinning blade 3 respectively. Smooth transition can be realized between the first convex rib 31 and the second convex rib 32. Central angle between end A and end B of the water spinning blade 3 is 45-60.

Embodiment 2

(12) According to FIG. 4, in this embodiment, A height change of an upper surface of the water spinning blade 3 in extension direction from the center 5 of impeller disk to the edge is: rising to the maximum height, falling to the minimum height and then rising to realize smooth transition with the inner circumferential wall 4 of basin-shaped impeller disk. Height difference H1 between the maximum height and the minimum height of the water spinning blade is 1.2-1.3 times of the depth H of impeller disk. Height difference between the highest point of the water spinning blade and the center of the impeller disk is 0.1 times of the depth of the impeller disk. Point C of smooth transition between the water spinning blade 3 and the inner circumferential wall 4 of the impeller disk is located - of the depth H of the impeller disk. i.e., height difference h between point C and the lowest point of the impeller disk is - times of the depth H of the impeller disk, with times preferred.

Embodiment 3

(13) According to FIG. 3, multiple decoration areas 6 are set on the surface of the impeller disk between two water spinning blades 3, and these decoration areas are provided with small water penetrating holes 7. The decoration areas are water-mark-shaped shallow slots with different sizes, with depth of 2 mm. Multiple small water penetrating holes are distributed evenly in the shallow slots.

(14) The washing machine in the invention contains fully-automatic machine and double-tub washing machine. During washing, putting the clothing into the tub and detecting the load; inflooding water to reach the water level corresponding to the load capacity. The water level is lower than or equal to the load height; during washing, different types of water flows generated by controlling rotation-stop ratio of the impeller perform single sequential coordination or repeatedly alternating cycle coordination, so as to break the load balance to disperse clothing, and realize even overturn and washing, and keep the load evenly overturning.

(15) Further more, during washing, three types of water flows are generated by controlling rotation-stop ratio of the impeller: the agitating flow, the enhancing flow and the balancing flow. At first, using the agitating flow for washing and completely wet the clothing to realize even overturn and washing. After a certain time period for washing by the agitating flow, using the enhancing flow for washing and opening the clothing to increase the overturn amplitude and achieve adequate washing. At last, using the balancing flow to keep the load evenly cycle overturning; single sequential control or repeatedly alternating cycle control of the three types of water flows is adopted for the washing.

(16) In the invention, rotation-stop ratio of the impeller corresponding to the agitating flow can be the same with or different from that corresponding to the balancing flow. Besides, action time of the agitating flow and the balancing flow can be the same with or different from each other as well. The agitating flow breaks the load balance initially to disperse the clothing, and then the enhancing flow overturns the clothing, so the clothing has been distributed evenly and begins to overturn for washing. As a result, when rotation-stop ratio of the impeller corresponding to the agitating flow is the same with that corresponding to the balancing flow, the function of the balancing flow whose rotation-stop ratio of the impeller is the same with that corresponding to the agitating flow, do not break the load balance instead of keeping the load evenly overturning. Hence, if rotation-stop ratio corresponding to the agitating flow is the same with that corresponding to the enhancing flow, they belong to two different functions while share the same running mode. After a certain time period for keeping evenly overturning to wash, the washing is completed or needs to be continued to wash. At this moment, the intertwinement of the clothing may occur. In order to better even wash and to avoid any possible intertwining, cycle mode of the agitating flow, the enhancing flow and the balancing flow for washing is adopted. During washing in the alternating cycle of the said water flows, when the balancing flow joins to the agitating flow for each cycle, the driven modes of rotation-stop ratios corresponding to the two flows combine into one mode, and driven time is the sum of driven time of the two flows.

(17) After washing, the drive motor rotates and stops intermittently within the set time for dewatering and drainage. Then executing spraying and rinsing with no drainage, And the drive motor rotates and stops intermittently.

(18) In the drainage stage during rinsing, the drive motor simultaneously rotates and stops intermittently for dewatering; during dewatering, the washing machine will perform dewatering by utilizing the method of no drainage or drainage alternation. After dewatering, the wash tub stops from rotating and drainage begins. In the drainage stage during rinsing, most water in the clothing is thrown away and drained out. During dewatering, since of water quantity in the clothing is reduced, the water thrown away from the clothing does not need to be drained within a certain time period during which more water thrown away from the clothing will be accumulated. Then entering the next set time period, start the drainage, and then stop the drainage (repeat the drainage start and stop). Finally, realize drainage when the wash tub stops from rotating. The dewatering method of alternation of drainage start and stop can save energy of drainage equipment. Preferably, at the beginning of the dewatering process, the drive motor rotates and stops intermittently.

(19) Further more, the inlet water level meets water quantity by which the clothing can be completely wetted and will not float or separate from upper surface of the impeller. The water level is lower than the clothing height, so as to increase friction between the impeller and the clothing and drag the clothing to the impeller center during washing.

(20) The agitating flow, the enhancing flow and the balancing flow in the invention are controlled by the different rotation-stop ratios of the impeller generated by driving the impeller to rotate. The intensity of the enhancing flow is stronger than that of the agitating flow. Strong intensity of the enhancing flow can increase the overturn amplitude of the load.

(21) The intensity of the enhancing flow is stronger than that of the agitating flow. When drive unit of the washing machine is a frequency direct drive motor, the intensity of the agitating flow is adjusted for load capacity. The larger the load capacity is, the stronger the intensity is.

(22) On the washing machine, different gears are set according to different ranges of load capacities, which at least include the first load indicating the minimum range of load capacity. During washing with the enhancing flow corresponding to the first load, within the set working time of enhancing flow, the impeller rotates and stops multiple times in the same direction as per corresponding rotation-stop ratio and then repeats the rotation and stop in the opposite direction; during washing with the agitating flow and the balancing flow corresponding to any load capacity and the enhancing flow corresponding to any load capacity excluding the first load, the impeller performs forward and reverse alternative rotation as per corresponding rotation-stop ratio.

(23) In specific, when rated load of the washing machine is M, the first load is set to be more than 0 and less than or equal to 0.3M. The second load is more than 0.3M and less than or equal to 0.7M. The third load is more than 0.7M and less than or equal to M. The division method is different according to different models and rated loads.

(24) For rotation-stop ratio of the impeller corresponding to the agitating flow, the enhancing flow and the balancing flow, time of each rotation is 0.2-3.0 s and that of each stop is 0-3.0 s. Any time within the two ranges will combine to form a rotation-stop ratio corresponding to the agitating flow, the enhancing flow and the balancing flow,

(25) In specific, as for rotation-stop ratios of the impeller corresponding to the agitating flow and the balancing flow, time of each rotation is 0.2-2.0 s and that of each stop is 0.2-2.0 s. Any rotation time and stop time within the two ranges will combine to form the rotation-stop ratios corresponding to the agitating flow and the balancing flow.

(26) As for rotation-stop ratio corresponding to the enhancing flow, time of each rotation is 0.2-3.0 s and that of each stop is 0.2-3.0 s. Any rotation time and stop time within the two ranges will combine to form the rotation-stop ratio corresponding to the enhancing flow.

Embodiment 4

(27) FIGS. 6 and 7 refer respectively to a sequence diagram of rotation-stop ratios corresponding to all kind of water flows during the first load washing, the second load washing, and third load washing, wherein, t1, t2 and t3 indicate the single washing time for the agitating flow, the enhancing flow and the balancing flow respectively. A1, A2 and A3 indicate the rotation time of the impeller for the agitating flow, the enhancing flow and the balancing flow respectively. S1, S2 and S3 indicate the stop time of the impeller for the agitating flow, the enhancing flow and the balancing flow respectively. Ai/Si, i=1, 2 or 3, i.e., rotation-stop ratio corresponding to the agitating flow, the enhancing flow and the balancing flow respectively.

(28) In this embodiment, a washing machine with rated load capacity of 10 kg is taken as an example:

(29) The first load: 30% of load capacity (3 kg)

(30) The second load: 50% of load capacity (5 kg)

(31) The third load: 70% of load capacity (7 kg)

(32) Rotation-stop ratio of the impeller:

(33) Rotation, including forward rotation and reverse rotation: 0.2 s-3.0 s; stop, including stop after forward rotation and stop after reverse rotation: 0.2 s-2.0 s. Rotation time and stop time of the said two ranges can combine to the rotation-stop ratio of the impeller corresponding to each water flow.

(34) At first, use the agitating flow for washing, completely wet the clothing and realize even overturn and washing. Rotation-stop ratios of the impeller corresponding to different load capacities are shown as follows:

(35) The first load: the optimal rotation-stop ratio is 0.4/0.8 s

(36) The second load: the optimal rotation-stop ratio is 0.5/0.5 s

(37) The third load: the optimal rotation-stop ratio is 0.7/0.7 s

(38) The impeller corresponding to the agitating flow performs alternating forward and reverse rotation as per the said rotation-stop ratios. i.e., the rotation-stop ratio of impeller corresponding to the first load gear is: rotate forward for 0.4 s, stop for 0.8 s, rotate reversely for 0.4 s, stop for 0.8 s, rotate forward again for 0.4 s, stop for 0.8 s, rotate reversely for 0.4 s and stop for 0.8 s. Repeat the said cycle actions for 1 min and 12 s (see FIG. 6); in a similar way, the impeller corresponding to the second load gear and the third load gear shares the same rotation method while the rotation-stop ratios and rotation time are different. The rotation-stop ratio of the impeller corresponding to the second load gear is 0.5/0.5 s, with action time of 3 min and 10 s. The rotation-stop ratio of the impeller corresponding to the third load gear is 0.7/0.7 s, with action time of 2 min and 13 s (see FIG. 7).

(39) After a certain time period of washing by using the agitating flow, use the enhancing flow for washing and open the clothing, so as to realize up-down overturn of the clothing in the wash tub and achieve adequate washing. At this moment, rotation-stop ratios of the impeller corresponding to the enhancing flow for the different load capacities are shown as follows:

(40) The first load: the optimal rotation-stop ratio is 0.4/0.4 s

(41) The second load: the optimal rotation-stop ratio is 1.2/1.0 s

(42) The third load: the optimal rotation-stop ratio is 2.5/1.2 s

(43) During washing with the enhancing flow, the overturning effect is not obvious due to less load and small friction on the loading cloth on the first load. The rotation-stop ratio of the impeller corresponding to the enhancing flow is that it rotates forward for 0.4 s and then stops for 0.4 s, and again rotates forward for 0.4 s and then stops for 0.4 s. After forward rotation in such a circular manner for 4 s, it will rotate reversely for 0.4 s and then stop for 0.4 s, and again run in such a circular manner for 4 s (Refer to FIG. 6). For the gears of the second load and third load, the impeller performs forward and reverse rotation as per corresponding rotation-stop ratio. Namely, the rotation-stop ratio of the impeller corresponding to the enhancing flow at the gear of the second load is that the impeller rotates forward for 1.2 s and stops for 1.0 s, and then rotates reversely for 1.2 s and stops for 1.0 s; and again rotates forward for 1.2 s and stops for 1.0 s, and then rotates reversely for 1.2 s and stops for 1.0 s, repeating said circular actions for 25 s. Similarly, the rotation-stop ratio of the impeller corresponding to enhancing flow at the gear of the third load is that the impeller rotates forward for 2.5 s and then stops for 1.2 s, and then rotates reversely for 2.5 s and then stops for 1.2 s; and again rotates forward for 2.5 s and then stops for 1.2 s, and then rotates reversely for 2.5 s and then stops for 1.2 s, repeating said actions for 45 s (referring to FIG. 7).

(44) The balancing flow will maintain the circulation path for load evenly overturning. With different load capacities, the rotation-stop ratios of the impeller corresponding to balancing flow are shown as in the below:

(45) The first load: the optimal rotation-stop ratio is 0.3/0.4 s

(46) The second load: the optimal rotation-stop ratio is 0.5/0.5 s

(47) The third load: the optimal rotation-stop ratio is 0.5/0.5 s

(48) In this embodiment, when the load is the small, namely the first load, the rotation-stop ratio of the impeller corresponding to balancing flow and that corresponding to agitating flow are different, but their action time is the same and all is 1 min and 12 s. For the second load, the rotation-stop ratio of the impeller corresponding to the balancing flow is the same with that corresponding to agitating flow and their action time is the same too, all is 3 min and 10 s. For the third load, the rotation-stop ratio of the impeller corresponding to balancing flow and that corresponding to agitating flow are different, but their action time is the same, all is 2 min and 13 s.

(49) After washing with balancing flow, the agitating flow, enhancing flow and balancing flow will proceed. Said processes will be repeated circularly till finishing washing. Or the agitating flow, the enhancing flow and the balancing flow are applied once for each, and the action time of each flow is prolonged correspondingly.

Embodiment 5

(50) Take the fully-automatic washing machine, the rated load capacity of which is 12 kg, as an example:

(51) The first load: 30% of load capacity (3.6 kg)

(52) The second load: 70% of load capacity (8.4 kg)

(53) The third load: 100% of load capacity (12 kg)

(54) Water level on condition that the loading cloth is completely drenched:

(55) The water level in the wash tub is 100 mm below the loading cloth.

(56) Rotation-stop ratio of the impeller:

(57) Rotation (including forward rotation and reverse rotation): 0.5-3.0 s; stop (including stop after forward rotation and stop after reverse rotation): 0.1-2.5 s. Rotation time and stop time of the said two ranges can combine to the rotation-stop ratio of the impeller corresponding to each water flow.

(58) At first, use the agitating flow for washing, completely wet the cloth and realize even overturn and washing. Rotation-stop ratios of the impeller corresponding to different load capacities are shown as follows:

(59) The first load: the optimal rotation-stop ratio is 0.5/1.0 s

(60) The second load: the optimal rotation-stop ratio is 0.7/0.7 s

(61) The third load: the optimal rotation-stop ratio is 0.8/0.8 s

(62) The forward and reverse rotation mode of the impeller corresponding to the agitating flow are the same with those in Embodiment 1, but rotation-stop ratios and rotation durations are different.

(63) The rotation-stop ratios of the impeller corresponding to the enhancing flow for different load capacities are shown as follows:

(64) The first load: the optimal rotation-stop ratio is 0.5/0.5 s

(65) The second load: the optimal rotation-stop ratio is 1.5/1.2 s

(66) The third load: the optimal rotation-stop ratio is 2.8/1.6 s

(67) The rotation-stop ratio corresponding to the enhancing flow at first load is that the impeller rotates forward for 0.5 s and then stops for 0.5 s, and again rotates forward for 0.5 s and then stops for 0.5 s. After the set time for circular forward rotation, it rotates reversely for 0.5 s and then stops for 0.5 s, and again repeats such reverse rotation for a set duration. The forward and reverse rotation modes of the impeller at other loads are the same with those in Embodiment 1, but the rotation-stop ratios and rotation durations are different.

(68) The rotation-stop ratios of the impeller corresponding to the balancing flow for different load capacities are shown as follows:

(69) The first load: the optimal rotation-stop ratio is 0.5/1.0 s

(70) The second load: the optimal rotation-stop ratio is 0.7/0.7 s

(71) The third load: the optimal rotation-stop ratio is 0.8/0.8 s

(72) The rotation-stop ratio of the impeller corresponding to the balancing flow and that corresponding to the agitating flow are the same. In this embodiment, the washing is finished via applying agitating flow, enhancing flow and balancing flow each for once.

(73) The foregoing is only in the case of washing machines with rated load capacities of 10 kg and 12 kg. But it is also applicable to washing machines with different rated load capacities, for example, 6 kg, 8 kg, etc. However, though the foregoing data is not the best for washing machines with other rated load capacities, corresponding adjustment or application of the data can also realize the overturning modes during washing.

(74) In Embodiments 4 and 5, the rotation-stop ratio of the impeller corresponding to balancing flow and that corresponding to agitating flow for different load capacities are the same or different, the nature of which generate two types or three types of water flows. In the invention, not only two or three types of water flows are disclosed, but the rotation-stop ratio is divided into four or five types, etc. in a more detailed manner on the basis of the three types of water flows, so as to realize the fourth, fifth and more water flows. Such division requires more accurate control to the motor, that is, different rotation-stop ratios will be adopted in different set duration during washing; and during rinsing, and the water flows adopted can be the same as that during washing.

Embodiment 6

(75) As for washing machine in the invention, in the drainage stage at the end of rinsing, simultaneously the drive motor rotates and stops intermittently for dewatering. There are two stages for rotation speeds and rotation-stop modes of the motor for dewatering: during dewatering, the washing machine will use the method of the alternation of no drainage and drainage. At the end of dewatering, the wash tub stops from rotating, and drainage begins, rotation speed of the motor will increase stage by stage. This embodiment is adopted a implementation mode in the drainage stage during rinsing and during dewatering for the washing machine with rated load capacity of 10 kg (referring to FIG. 8). Details are shown as follows:

(76) TABLE-US-00001 Running mode Rotation Procedure Action of the motor Duration speed Drainage Simultaneous Rotate for 1 s 30 s 100 rpm stage during drainage and stop for 3 s rinsing and spinning Rotate for 3 s 30 s 300 rpm and stop for 3 s Dewatering Dewatering Rotate for 3 s 30 s 300 rpm with no and stop for 3 s drainage Dewatering Rotate 2 min 560 rpm and continuously drainage Dewatering 1 min 560 rpm with no drainage Dewatering 3 min 850 rpm and drainage Dewatering 3 min 850 rpm with no drainage Inertial 1 min and 15 s dewatering Brake startup 10 s and drainage

(77) The table only discloses a running action and parameters in this embodiment. As for washing machines with different rated load capacities, the said running modes, durations and rotation speeds of the motor are different. Preferably, if the same model of washing machine has different load capacities, the said parameters are different.

(78) Washing method in the invention largely reduces the water consumption. About 30% water can be saved for each washing. i.e., wash buffer with the same concentration needs less detergent. Hence, Water saving and detergent saving (relatively) can be achieved simultaneously. Pollution caused by drainage can be eased.

(79) Of course, the invention is not limited to the said embodiments. As for technical schemes which are obvious to a person skilled in the art, in case of not separating from the spirit or scope of the invention, any modification or change to the invention is subject to the scope of Claims of the invention and corresponding substitution.