WO2015192639A1 - 洗衣机 - Google Patents

洗衣机 Download PDF

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Publication number
WO2015192639A1
WO2015192639A1 PCT/CN2014/095888 CN2014095888W WO2015192639A1 WO 2015192639 A1 WO2015192639 A1 WO 2015192639A1 CN 2014095888 W CN2014095888 W CN 2014095888W WO 2015192639 A1 WO2015192639 A1 WO 2015192639A1
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WO
WIPO (PCT)
Prior art keywords
washing
washing machine
inclination angle
center
rotary wing
Prior art date
Application number
PCT/CN2014/095888
Other languages
English (en)
French (fr)
Inventor
川村保
山内智博
Original Assignee
海尔亚洲国际株式会社
青岛海尔洗衣机有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 海尔亚洲国际株式会社, 青岛海尔洗衣机有限公司 filed Critical 海尔亚洲国际株式会社
Priority to EP14894863.1A priority Critical patent/EP3156534B1/en
Priority to US15/317,040 priority patent/US10077521B2/en
Priority to KR1020177001265A priority patent/KR20170018060A/ko
Priority to CN201480079767.6A priority patent/CN106460280B/zh
Publication of WO2015192639A1 publication Critical patent/WO2015192639A1/zh

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F23/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry 
    • D06F23/06—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry  and rotating or oscillating about an inclined axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F17/00—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid
    • D06F17/06—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid by rotary impellers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F17/00—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid
    • D06F17/06—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid by rotary impellers
    • D06F17/10—Impellers

Definitions

  • the present invention relates to a washing machine capable of reducing power consumption.
  • a rotating shaft is provided at the center of the rotary wing, and a plurality of agitating blades radially extending around the rotating shaft are formed on the surface.
  • the rotating blade is rotated by a driving unit including a motor, and the water to be washed into the inside of the washing tub and the object to be washed are stirred to wash the object to be washed.
  • Patent Document 1 JP-A-2000-14958
  • An object of the present invention is to effectively solve such problems, and in particular, to provide a washing machine capable of reducing power consumption.
  • the present invention contemplates the following method.
  • the washing machine of the present invention includes: a substantially bottomed cylindrical washing tub; a rotary wing rotatably provided at the bottom of the washing tub; and a drive unit that rotationally drives the rotary wing by receiving electric power, the rotation
  • the wing is formed in a disk shape centered on the rotation axis, and a surface thereof is provided with a plurality of agitating blades radially extending toward the outer circumference, and the washing machine is characterized in that the center of the plurality of agitating blades is set at a ratio
  • the rotating shaft is further displaced to the outer diameter direction, and the center of the plurality of stirring blades is provided with a protruding portion that protrudes toward the axial direction of the rotating shaft than the stirring blades.
  • the present invention is characterized in that the rotation axis of the rotary wing substantially coincides with the central axis of the washing tub, and the central axis is inclined with respect to the vertical axis.
  • the present invention is characterized in that the inclination angle inclined with respect to the vertical axis of the central axis is set to a range of 6 to 20°.
  • the present invention is characterized in that the tip end of the protruding portion is formed in a partial spherical shape.
  • the plurality of agitating blades radially disposed at positions shifted from the rotational axis to the outer diameter direction and the protruding portions provided at the center of the agitating blades can efficiently generate water flow. Further, since the object to be washed is efficiently operated, the washing ratio and the cleaning unevenness can be limited to the allowable range and the power consumption of the driving unit can be reduced. Therefore, energy consumption can be suppressed and operating costs can be reduced.
  • the power consumption can be reduced by the shape of the rotor, when the motor is included in the drive unit, even if an expensive inverter motor is not used in the motor, a general-purpose motor can be used, and the entire washing machine can be realized. The cost is reduced. Further, when the portion of the power consumption is reduced by the shape of the rotating blade, and the internal loss in the motor is allowed, it is possible to further reduce the cost by changing the commonly used copper coil to the aluminum coil.
  • the washing in which the inclination angle is set to a range of 6 to 20°, the washing can be further increased.
  • the ratio can be improved in both the washing performance and the power consumption.
  • the tip end of the protruding portion is formed in a spherical shape, the effect of operating the object to be washed by the protruding portion is obtained, and the damage of the object to be washed by the protruding portion can be suppressed, and the washing is preferably performed.
  • Fig. 1 is a longitudinal sectional view showing a washing machine in accordance with an embodiment of the present invention.
  • Fig. 2 is a perspective view showing a rotary wing provided in the same washing machine.
  • FIG 3 is a view showing a state in which the same rotor is viewed from the direction of the rotation axis.
  • Fig. 4 is a view showing a cross section A-A, a B-B cross section, and a C-C cross section in Fig. 3;
  • Fig. 5 is a vertical cross-sectional view showing an example in which the inclination angle of the washing tub is changed.
  • Fig. 6 is a vertical cross-sectional view showing an example in which the inclination angle of the washing tub is further changed.
  • Fig. 7 is a view showing the evaluation results of the same washing machine together with a comparative example.
  • Fig. 8 is a view showing the evaluation results of the same washing machine together with a comparative example.
  • FIG. 9 is a graph showing the relationship between the tilt angle and the power consumption amount, which is shown by a graph based on the evaluation result of FIG. 8.
  • Fig. 10 is a graph showing the relationship between the inclination angle and the washing ratio by a graph based on the evaluation results of Fig. 8;
  • Fig. 11 is a view showing the relationship between the inclination angle and the cleaning unevenness by a graph based on the evaluation results of Fig. 8;
  • FIG. 12 is a view showing a rotary wing constituting a comparative example for comparison with the present embodiment.
  • Fig. 1 is a longitudinal sectional view showing a washing machine 1 according to an embodiment of the present invention.
  • the washing machine 1 described in the figure has a schematic configuration, and a portion that is not related to the present invention is omitted.
  • the washing machine 1 includes a main body 2, an outer tub 3, a washing tub 4, a rotor blade 5, and a drive unit 6.
  • the depth direction of the main body 2 is defined as the x direction
  • the width direction is defined as the y direction
  • the vertical direction is defined as the z direction.
  • These x, y, and z directions cross each other to form a coordinate system shown in the drawing.
  • the x direction is based on the direction from the front side toward the rear side of the washing machine 1, and the front side of the washing machine 1 refers to the user standing position side in the case where the washing machine 1 is used.
  • the description will be made in accordance with the coordinate system described above.
  • the main body 2 includes a bottom plate 22 having a substantially rectangular shape in plan view, and four sides forming four sides rising from the edge portion thereof.
  • the side plates 21 and the top plate 23 connected to the upper portion thereof are integrally formed in a substantially rectangular parallelepiped shape, and are surrounded by them to form an inner space 2a having a substantially rectangular parallelepiped shape.
  • the bottom plate 22 has a leg 22a which can provide the main body 2 to the floor surface near the four corners of the lower surface thereof.
  • the top plate 23 is parallel to the opening edge 43 of the washing tub 4 to be described later, and is disposed obliquely to the front side of the washing tub 4 in this example.
  • a substantially circular opening 23a is formed in the vicinity of the center of the top plate 23, and the object to be washed can be taken out into the washing tub 4 through the opening 23a.
  • a cover member 24 for opening and closing the opening 23a is provided in an upper portion of the top plate 23.
  • the outer tank 3 is formed of a synthetic resin and is a substantially bottomed cylindrical member having a substantially circular bottom plate 31 and a side plate 32 rising from an edge portion of the bottom plate 31. Further, the outer tub 3 may be formed by changing the bottom plate 31 into a polygonal shape or the like, and it is sufficient to form only a substantially bottomed cylindrical shape.
  • the outer tub 3 is suspended by four hangers 7 provided at the four corners of the inner space 2a of the main body 2, and the outer slot 3 is opposed to the position where the boom 7 is engaged with the outer tub 3 by changing the length of each boom 7
  • the vertical axis (z axis) is tilted to the front side.
  • the boom 7 is composed of a rod main body 71 and a suspension 72 provided at the tip end thereof, and absorbs the displacement of the outer tub 3 and elastically supports the outer tub 3.
  • the washing tub 4 is made of metal and is a substantially bottomed cylindrical member having a bottom plate 41 having a substantially circular shape in plan view and a side plate 42 rising from an edge portion of the bottom plate 41.
  • the washing tub 4 is disposed coaxially with the outer tub 3 inside the outer tub 3, and is rotatably supported by the outer tub 3. Further, the washing tub 4 also functions as a dewatering tank, and the side plate 42 and the bottom plate 41 are provided with a plurality of openings (not shown) through which the water in the washing tub 4 can be discharged. Further, the washing tub 4 is the same as the above-described outer tub 3, and it is not necessary to form the bottom plate 41 into a circular shape, and it is sufficient to change the shape of the bottom plate 41 to form a substantially bottomed cylindrical shape.
  • the bottom of the washing tub 4 is rotatably provided with a rotating blade 5 formed in a substantially disk shape.
  • the rotation axis Ra of the rotary wing 5 coincides with the central axis Rb of the washing tub 4 that forms a substantially cylindrical shape.
  • the rotation axis Ra of the rotor blade 5 also coincides with the central axis of the outer groove 3, and is inclined from the vertical axis (z axis) to the front side similarly to the outer groove 3.
  • the inclination of the rotation axis Ra and the central axis Rb of the washing tub 4 is defined as the inclination angle ⁇ with reference to the vertical axis (z axis).
  • the inclination angle ⁇ is set to 12°, but the inclination angle ⁇ is not limited to 12° as will be described later.
  • the drive unit 6 is fixed to the lower side of the outer tub 3, and has a motor 61 that rotates by receiving supply of electric power, a speed reducer 62, and a first output shaft 63 and a second output shaft 64 that are rotated by the torque of the motor 61.
  • the motor 61 is constructed as a brushless motor, and the coil is of the same copper type as a general motor. Further, the motor 61 is also an inverter motor driven by an inverter, and is provided by an unillustrated The inverter controls the application of frequency and voltage for efficient control.
  • the second output shaft 64 is formed in a cylindrical shape and disposed coaxially with the first output shaft 63.
  • the first output shaft 63 penetrates into the inside of the washing tub 4, and the tip end is fitted into the boss portion 51 (see FIG. 3) formed in the rotor blade 5, and is fixed by a mounting screw 65. Therefore, the rotary wing 5 rotates integrally with the first output shaft 63.
  • the top end of the second output shaft 64 is fixed to the bottom plate 41 of the washing tub 4. Therefore, the washing tub 4 and the second output shaft 64 rotate integrally.
  • the electric motor 61 is provided with a clutch mechanism (not shown), and by switching the clutch mechanism ON and OFF, the first operation mode in which the torque of the motor 61 is rotated only by the first output shaft 63 and the two output shafts 63 can be switched.
  • the torque of the motor 61 can be transmitted to the first output shaft 63 via the speed reducer 62 to be operated at a low speed and high torque.
  • the first operation mode and the operation at the time of washing in which the rotary blade 5 is rotated in a state where the washing tub 4 is stopped, and the second operation mode correspond to the operation at the time of dehydration in which the washing tub 4 and the rotary blade 5 are simultaneously rotated at high speed.
  • FIG. 2 is a perspective view showing the above-described rotor blade 5
  • FIG. 3 is a view of the surface side of the rotor blade 5 as seen from the direction of the rotation axis.
  • the front side of the rotor blade 5 is a side that is located above the washing tank 4 (see FIG. 1 ) and is in contact with the object to be washed.
  • 4(a), (b), and (c) are cross-sectional views of the A-A position, the B-B position, and the C-C position of Fig. 3, respectively.
  • the rotor blade 5 of the present embodiment is formed into a disk-shaped rotor that is substantially centered on the rotation axis Ra, and is specifically based on a disk portion 5A formed in a disk shape.
  • the boss portion 51, the agitating blade 52, and the protruding portion 53 are integrally formed on the surface (surface) on the surface side.
  • the boss portion 51 is a member that mounts the rotor blade 5 to the first output shaft 63 (see FIG. 1 ) and is formed at the center of the rotor blade 5 .
  • the boss portion 51 protrudes in the axial direction of the rotation axis Ra from the disk portion 5A, is formed larger than the thickness of the other portion, and is provided at the center thereof for inserting the first output shaft 63 (refer to FIG. 1) from the back side. Through hole 51a. Therefore, as described above, the first output shaft 63 (see FIG. 1) is inserted into the through hole 51a from the back side, and the mounting screw 65 is screwed into the screw hole provided at the tip end of the first output shaft 63 (not shown). (refer to FIG. 1), the rotary wing 5 can be fixed to the first output shaft 63.
  • the agitating blade 52 is provided on the surface side of the rotor blade 5, and protrudes from the disk portion 5A in the axial direction of the rotating shaft Ra similarly to the boss portion 51. More specifically, the agitating blades 52 are provided with five agitating blades 52a to around the center Cw at a position shifted from the rotating shaft Ra toward the radial direction of the disk portion 5A toward the outer edge. 52e, the agitating blades 52a to 52e radially extend from the center Cw toward the outer circumference of the rotor blade 5.
  • the reference numerals of the stirring blades 52a to 52e are used without special distinction.
  • the distance d from the rotation axis Ra to the center Cw of the agitation blade 52 is set to about 1/3 of the radius of the rotor blade 5.
  • each of the agitating blades 52 is curved so as to gradually advance clockwise toward the outer circumference.
  • each of the agitating blades 52 is formed to be slightly convexly curved with respect to the axial direction while extending from the center Cw toward the outer circumference. Specifically, the height in the axial direction is slightly small in the vicinity of the center Cw, the height in the axial direction is maximized in the middle extending toward the outer circumference, and the height in the axial direction is again small in the vicinity of the outer circumference.
  • the cavities 54 whose axial height is lowered are formed between the agitation blades 52 and 52, respectively.
  • irregularities are formed by the respective concave portions 54 formed between the stirring blades 52a to 52e and between them, and by rotating the object to be washed between the irregularities, the cleaning action can be improved.
  • the portions to be washed by the respective agitation blades 52a to 52e are different, and the washing performance can be further improved.
  • the recessed portion 54 also includes a recess 54 between the agitating blades 52d and 52e in a wide area; a recess 54 between the agitating blades 52e and 52a; and a recess 54 between the agitating blades 52a and 52b are formed on the outer circumference, respectively.
  • the disk portion 5A is provided with a plurality of through holes 56 for passing water between the front surface side and the back surface side at positions corresponding to the respective concave portions 54.
  • One of the agitating blades 52a to 52e is formed to extend from the center Cw toward the outer circumference via the rotation axis Ra, and is shared with a part of the boss portion 51. Therefore, the boss portion 51 can secure strength even if it is not particularly enlarged, and the rotor blade 5 is firmly attached to the first output shaft 63 by the boss portion 51 (see FIG. 1).
  • the recess 54 between the agitation blades 52 and 52 can be prevented from becoming small, and the space for the rolling motion of the object to be washed can be ensured and the washing performance can be suppressed. The reduction.
  • the protruding portion 53 is a member provided at the center Cw of the base end portion of the plurality of agitating blades 52a to 52e, and protrudes from the disk portion 5a toward the surface side in the axial direction of the rotation axis Ra.
  • the amount of protrusion Hp of the protruding portion 53 is defined as the maximum dimension between the surface (surface) on the surface side of the disk portion 5A and the tip end of the protruding portion 53 along the direction parallel to the rotation axis Ra (refer to FIG. 4).
  • the amount of protrusion Hb of the stirring blade 52 is defined (refer to FIG. 4).
  • the protruding amount Hp of the protruding portion 53 is set to about 1.5 times the protruding amount Hb of the stirring blade 52, but the size may be appropriately changed.
  • each of the stirring blades 52a to 52e is smoothly connected to the protruding portion 53. Further, since the tip end of the protruding portion 53 is formed in a smooth spherical portion shape, when the object to be washed is brought into contact with and moved, the object to be washed is not damaged, and the washing can be performed satisfactorily.
  • the protruding portion 53 is set to have a larger amount of protrusion Hp than the stirring blade 52.
  • the protruding portion 53 is disposed at a position shifted by a distance d from the rotating shaft Ra in the outer diameter direction, the protruding portion 53 can be washed by the protruding portion 53.
  • the object is efficiently operated, and the effect of the unevenness formed on the surface of the rotor blade 65 can be matched by the plurality of agitation blades 52, and the washing can be performed efficiently.
  • the stirring effect of the object to be washed can be improved by one step. Therefore, when the inclination angle ⁇ (see FIG. 1) of the rotation axis Ra (the center axis Rb) is increased, there is a tendency that the object to be washed is deflected toward the washing tub 4 by gravity, but even in such a case It is also possible to perform washing by the stirring effect by the protruding portion 53 as desired. Therefore, it is also suitable to change the distance d corresponding to the magnitude of the inclination angle ⁇ . Further, it is also preferable to change the amount of protrusion Hp of the protruding portion 53 in accordance with the magnitude of the inclination angle ⁇ .
  • the back side of the rotor blade 5 is formed by thinning the wall thickness for weight reduction and forming a rib for improving the strength.
  • the washing machine 1 of the present embodiment is a washing machine having the above configuration, but may be configured by changing the inclination angle ⁇ shown in Fig. 1 (see Fig.).
  • FIG. 5 and 6 are longitudinal cross-sectional views showing an example in which the inclination angle ⁇ is changed to be different from that of Fig. 1 .
  • the portion where the inclination angle ⁇ is smaller is slightly disadvantageous in that the ease of taking out the object to be washed is taken out from the washing tub 4 as compared with the example described in FIG. 1 .
  • Figure 6 In the example shown in the example shown in FIG. 1, the portion where the inclination angle ⁇ is increased is more advantageous in that the object to be washed is taken out from the washing tub 4, and the power consumption and washing performance are as described later. The same effect can be obtained at this point.
  • FIG. 12(a) and 12(b) are views each showing a rotor blade 105 used in Comparative Example 1 and a rotor blade 205 used in Comparative Example 2, which are compared with the embodiment of the present invention.
  • These figures are diagrams corresponding to FIG. 3, and the front side of the rotary blades 105 and 205 are seen from the direction of the rotation axis.
  • the same components as those in FIG. 3 are denoted by the same reference numerals, and the detailed description is omitted.
  • the rotary blades 105, 205 shown in Fig. 12 are set to have the same outer diameter as the rotary blades 5 shown in Fig. 3.
  • the rotary blade 105 used in the comparative example 1 shown in FIG. 12 is a conventionally used member, and a boss portion 51 is formed at a central portion of the disk portion 105A, and a radial portion is formed around the boss portion 51.
  • Five agitating blades 152 That is, the rotation axis Ra of the rotary wing 105 coincides with the center Cw of the five agitation blades 152.
  • a baffle portion 55 and a through hole 56 are formed between the adjacent stirring blades 152 and 152, respectively.
  • the shape of the protrusion amount Hb (refer FIG. 4) of the stirring blade 152 and the baffle part 55 is set to the same as the rotating blade 5 (FIG. 1-4) in the washing machine 1 of this Embodiment.
  • the rotary vane 205 used in the comparative example 2 is a rotary vane provided with the protruding portion 253 on the rotary vane 105 used in the above-described comparative example 1. Specifically, at a position overlapping one of the agitating blades 152a of the agitating blades 152, a part is shared and a protruding portion 253 is provided.
  • the distance between the center of the protruding portion 253 and the rotation axis Ra is set to be about 1/3 of the radius of the rotary blade 205, similarly to the rotary blade 5 (see FIG. 3) in the above-described embodiment.
  • the amount of protrusion Hp of the protruding portion 253 is also set to be the same as that of the above-described rotor blade 5 (see FIGS. 1 to 4).
  • the evaluation of the washing machine 1 is based on the evaluation criteria of the washing machine performance specified by the JEMA, and the evaluation items are three items: power consumption, cleaning ratio, and cleaning unevenness.
  • the data was matched with the data of the above three evaluation items, and the experimental conditions were set based on the washing performance evaluation method described in the above-described washing machine performance evaluation standard. That is, it will contain a wet artificial stain cloth ( Next, it is called "stain cloth.”
  • the predetermined amount of test cloth, water, and lotion are put into operation in the specified order.
  • the test conditions were as follows: a water temperature of 20 ° C, a water hardness of 40 ppm (mg / L), and a cleaning process of only 10 minutes.
  • the amount of the test cloth was set to two levels of 4 kg and 8 kg, and the amount of water was set to 47 L when the test cloth was set to 4 kg, and the amount of water was set to 60 L when the test cloth was set to 8 kg.
  • the detergent to be used the same commercially available synthetic detergent was used, and each was put into a prescribed amount according to the amount of water.
  • the value measured by the integrated electric power meter is set as the power consumption amount (wh). Further, this power consumption is mainly the amount of electric power consumed by the motor 61 constituting the above-described drive unit 6. Further, the degree of cleanliness was calculated from the reflectance of the stain cloth before and after the operation and the reflectance of the same type of cloth, and the washing ratio as a ratio to the washing degree of the standard washing machine was obtained. Further, the standard deviation of the degree of cleaning was determined, and the washing unevenness as a ratio of the standard deviation of the washing degree of the standard washing machine was obtained. The washing ratio and the uneven washing can be said to be indicators indicating the washing performance (cleaning performance) of the washing machine.
  • the washing machine performance evaluation standard defined by JEMA specifies a washing ratio of 0.8 or more and a washing unevenness of 3 or less as the target washing performance. Therefore, this embodiment is also based on this.
  • Figs. 7 and 8 are diagrams showing the results of the operation under the above-described conditions, and the evaluation results of the washing machine 1 of the present embodiment shown in Figs. 1 and 5 are shown together with a comparative example.
  • the washing machine 1 of the embodiment and the evaluation result of the washing machine 1 of the comparative example 1 of the rotary blade 105 are the figure of a table.
  • the power consumption of the Example was significantly lower than that of Comparative Example 1. Further, although the washing ratio and the cleaning unevenness were slightly inferior to those of Comparative Example 1, the above-described target cleaning performance was satisfied.
  • the power consumption of the Example was significantly lower than that of Comparative Example 1.
  • the cleaning ratio, the cleaning unevenness, and the above-described target cleaning performance were satisfied. Although the cleaning unevenness was slightly inferior to that of Comparative Example 1, the cleaning ratio was better than Comparative Example 1.
  • the washing machine 1 of the comparative example 1 including the rotary blade 105 see FIG. 12(a)
  • the evaluation result of the washing machine 1 of the comparative example 2 including the rotary blade 205 see FIG. 12(b)
  • the washing machine 1 single evaluation result is made into a table.
  • FIGS. 9 , 10 , and 11 are based on the contents of FIGS. 8( a ) to 8 ( d ), and the horizontal axis is the inclination angle ⁇ , and the vertical axis is the power consumption amount, and the cleaning ratio or the cleaning unevenness is plotted. The way the performance is represented.
  • the power consumption of the embodiment is about 10% smaller than that of the comparative examples 1 and 2.
  • the center Cw of the plurality of agitating blades 52 is disposed at a position shifted from the rotational axis Ra to the outer diameter direction, and the center Cw is provided at a more rotational axis Ra than the agitating blade 52.
  • the protruding portion 53 that protrudes in the axial direction can efficiently perform the operation of the water and the object to be washed in the washing tub 4, and can reduce the power consumption generated by the motor 61.
  • the washing ratio in 1, 2 is equal to or higher than the level.
  • Comparative Example 1 having the same rotary blade 105 as the prior art, with respect to the inclination angle ⁇ From 0 to 12, the washing ratio gradually decreased slightly, and in the examples, the washing ratio tends to increase greatly. Further, in Comparative Example 2 including the protruding portion 253, since the inclination angle ⁇ is increased from 6° to 12°, the washing tends to greatly increase. From this, it can be understood that the washing ratio is increased by setting the inclination angle ⁇ to exceed 0°, in particular, to set a large value in the vicinity of 12° with the superposition effect of the structure in which the protruding portion 53 (253) is provided.
  • the protruding portion 53 (253) lifts the object to be washed in a direction opposite to the inclination, and the object to be washed tends to move along the inclined direction, and the object to be washed is passed.
  • the movement improves the wash ratio.
  • the effect of the above-described movement of the object to be washed is further improved by dislocating the center Cw of the agitation blade 52 from the rotation axis Ra. Therefore, in accordance with this effect, it is conceivable that the embodiment can obtain the maximum washing ratio at a tilt angle of 12°. From such a tendency and the estimated action and effect, even if the inclination angle ⁇ is made larger than 12°, a larger washing ratio can be expected.
  • the washing machine 1 of the present embodiment can reduce the power consumption by a large extent in the range in which the washing ratio and the cleaning are not the target cleaning performance. Therefore, when the above-described configuration is used as it is, it is expected to reduce the running cost.
  • the manufacturing cost can be reduced by using the general-purpose motor. Further, it is also conceivable to change the coil from the copper type to the aluminum type. In this case, as in the case of using a general-purpose motor, the manufacturing cost can be reduced.
  • the function of the washing tank as the dewatering tank is intended to be used as a washing.
  • the polyester dewatering tank is configured, but it can be configured as a simple washing tank 4 which does not have a function as a washing tank. In this case, it can also be applied to the present invention and the same effects as described above can be obtained.
  • the outer tank 3 is not required, and it is not necessary to rotate the washing tub 4 by the drive unit 6.
  • the rotation axis Ra is parallel or inclined with respect to the vertical axis (z axis), but the inclination angle ⁇ is set to 90°, that is, the washing tub 4 is opened in the horizontal direction. That is, the above-described rotary wing 5 can also be applied to the drum washing machine.
  • washing machine washing machine
  • 4 washing tank
  • 5 rotating wing
  • 6 driving unit
  • 51 bushing portion
  • 52, 52a to 52e stirring blade
  • 53 protruding portion
  • Cw center of (multiple stirring blades)
  • Ra rotation axis
  • Rb center axis of (washing tank);
  • ⁇ inclination angle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

一种能降低耗电量的洗衣机。具备：大致有底筒状的洗涤槽（4）；旋转自由地设置于该洗涤槽（4）的底部的旋转翼（5）；以及通过接受电力供给而旋转驱动旋转翼（5）的驱动单元（6），旋转翼（5）形成为以旋转轴（Ra）为中心的圆盘状，并且其表面设有朝着外圆周呈放射状延伸的多个搅拌叶片（52），这些搅拌叶片（52）的中心（Cw）设于比所述旋转轴（Ra）更往外径方向错位的位置，并且搅拌叶片（52）的中心（Cw）处设有比这些搅拌叶片（52）更向旋转轴（Ra）的轴向突出的突出部（53）。

Description

洗衣机 技术领域
本发明涉及一种能降低耗电量的洗衣机。
背景技术
以往，普遍已知有一种洗衣机，在形成为箱状的主体的内部支承有底筒状的洗涤槽，且该洗涤槽的底部设有被称为波轮的圆盘状的旋转翼(例如，参照专利文献1)。
旋转翼的中心处设有旋转轴，表面形成有以旋转轴为中心呈放射状延伸的多个搅拌叶片。而且，通过由包含电动机的驱动单元使旋转叶片旋转，搅拌被放入洗涤槽内部的水、洗涤对象物，进行洗涤对象物的洗涤。
现有技术文献
专利文献
专利文献1：特开2000-14958号公报
发明内容
发明所要解决的问题
上述的洗衣机重视基本的洗涤性能，为了提高构成其评价基准的洗净比、清洗不均而逐步推动改良，对洗衣机的整体结构、旋转翼的形状也提出了各种方案。但是，由于这样的改良把重点放在洗涤性能的提高、附加价值的导入等，因此着眼于耗电量的降低这种观点的改良几乎未被推进。
然而，近年在全球化的进程中，用户的需求有更加多样化的倾向，为了降低运转成本，耗电量的降低的要求也已增多。
进而，还要求以更低的价格来供应通用制品，作为以此为目的的方法，考虑过将以逆变器所进行的控制为前提的成本高的逆变器电机转换成通用电机、将电机线圈从铜制变更为铝制。像这样变更电动机的情况，由于伴随着电机内部的损耗增大，因此通常耗电量增大。因此，为了以与现有相同的运转成本进行使用，与上述相同地需要进行耗电量的降低。
本发明的目的在于有效地解决这样的问题，具体而言，目的在于提供一种能降低耗电量的洗衣机。
用于解决课题的手段
本发明为了达成相关目的，考虑了下述的方法。
即，本发明的洗衣机具备：大致有底筒状的洗涤槽；旋转自由地设置于该洗涤槽的底部的旋转翼；以及通过接受电力供给而旋转驱动所述旋转翼的驱动单元，所述旋转翼形成为以旋转轴为中心的圆盘状，并且其表面设有朝着外圆周呈放射状延伸的多个搅拌叶片，所述洗衣机的特征在于，所述多个搅拌叶片的中心设于比所述旋转轴更往外径方向错位的位置，并且所述多个搅拌叶片的中心处设有比这些搅拌叶片更向所述旋转轴的轴向突出的突出部。
另外本发明的特征在于，使所述旋转翼的旋转轴与洗涤槽的中心轴大致一致，并且使所述中心轴相对于铅直轴倾斜。
进而本发明的特征在于，将相对于所述中心轴的铅直轴倾斜的倾斜角设定为6～20°的范围。
另外本发明的特征在于，所述突出部的顶端形成为部分球面状。
发明效果
根据以上说明的本发明，由于通过以比所述旋转轴更往外径方向错位的位置为中心呈放射状配置的多个搅拌叶片、以及设置于搅拌叶片的中心的突出部，能高效地产生水流，并且使洗涤对象物高效地动作，因此可将洗净比、清洗不均限制在允许范围内并降低驱动单元的耗电量。因此，能抑制能源消耗，降低运转成本。
另外，由于能通过旋转翼的形状降低耗电量，因此在驱动单元中包含电动机的情况下，即使不在该电动机中使用高价的逆变器电机，也能使用通用电机来构成，可实现洗衣机整体的成本降低。进而，通过旋转翼的形状降低耗电量的部分，在允许电动机内的内部损失的情况下，能通过将平常使用的铜线圈变更为铝线圈实现更进一步的成本降低。
特别地，根据使洗涤槽的中心轴以及旋转翼的旋转轴倾斜的本发明，由于能与将旋转翼制成上述形状相结合，在旋转翼的表面对洗涤对象物产生高效的滚动运动，因此能使耗电量降低并使洗净比高于以往。
特别地，根据将倾斜角设定为6～20°的范围的本发明，能进一步增大洗净 比，可兼得洗涤性能的提高和耗电量的降低。
另外，根据将突出部的顶端制成部分球面状的本发明，得到通过突出部使洗涤对象物动作的效果的同时，能抑制该突出部所导致的洗涤对象物的损伤，理想地进行洗涤。
附图说明
图1是表示本发明的一个实施方式的洗衣机的纵剖图。
图2是表示同一洗衣机具备的旋转翼的立体图。
图3是表示从旋转轴方向观察同一旋转翼的状态的图。
图4是表示图3中的A-A剖面、B-B剖面、C-C剖面的图。
图5是表示变更了洗涤槽的倾斜角的例子的纵剖图。
图6是表示进一步变更了洗涤槽的倾斜角的例子的纵剖图。
图7是表示将同一洗衣机的评价结果与比较例一同示出的图。
图8是表示将同一洗衣机的评价结果与比较例一同示出的图。
图9是表示基于图8的评价结果由图表示出倾斜角和耗电量的关系的图。
图10是表示基于图8的评价结果由图表示出倾斜角和洗净比的关系的图。
图11是表示基于图8的评价结果由图表示出倾斜角和清洗不均的关系的图。
图12是表示构成用于与本实施方式进行比较的比较例的旋转翼的图。
具体实施方式
以下，参照附图对本发明的实施方式进行说明。
图1是表示本发明的一个实施方式的洗衣机1的纵剖图。本图所述的洗衣机1是示出了大致结构，省略了与本发明无关的部分。
该洗衣机1具备：主体2、外槽3、洗涤槽4、旋转翼5、以及驱动单元6。
此处，在本实施方式中，将主体2的深度方向定义为x方向，将宽度方向定义为y方向，将铅直方向定义为z方向。这些x、y、z方向相互交叉，构成图中示出的坐标系。此外，x方向以从洗衣机1的前侧朝向后侧的方向为基准，洗衣机1的前侧是指在使用洗衣机1的情况下的使用者站立位置侧。以下，依照上述的坐标系进行说明。
主体2具备：俯视大致长方形的底板22、形成从其边缘部立起的四面的四 个侧板21、以及和与其上部连接的顶板23一体地构成为大致长方体状，并通过由它们包围而形成为大致长方体状的内部空间2a。底板22在其下表面的四角附近具有可将主体2设于地板面的脚22a。另外，顶板23与后述的洗涤槽4的开口边缘43平行，并在该例中配合洗涤槽4的倾斜略微向前侧倾斜地配置。而且在顶板23的中央附近形成有大致圆形的开口23a，通过该开口23a能对洗涤槽4内取出投入洗涤对象物。进而，该顶板23的上部设有用于使上述开口23a可开闭的盖构件24。
外槽3由合成树脂成型，是具备大致圆形的底板31和从底板31的边缘部立起的侧板32的大致有底圆筒状的构件。此外，外槽3也可以将底板31变更为多角形状等形状，即使只制成大致有底筒状也足够了。外槽3通过设于主体2的内部空间2a的四角的四根吊棒7被吊持，通过变更各吊棒7的长度、吊棒7与外槽3卡合的位置，外槽3相对于铅直轴(z轴)向前侧倾斜。吊棒7由棒主体71和设于其顶端的悬架72构成，吸收外槽3的位移且有弹性地支承该外槽3。
洗涤槽4由金属形成，是具有俯视大致圆形的底板41和从底板41的边缘部立起的侧板42的大致有底圆筒状的构件。洗涤槽4在外槽3的内部与该外槽3同轴地配置，并且由外槽3旋转自由地支承。另外，该洗涤槽4也具备作为脱水槽的功能，侧板42以及底板41设有未图示的许多开口，能通过该开口将洗涤槽4内的水排出。此外，该洗涤槽4与上述的外槽3相同，不需要将底板41制成圆形，即使只变更底板41的形状而制成大致有底筒状也足够了。
洗涤槽4的底部旋转自由地设有形成为大致圆盘状的旋转翼5。旋转翼5的旋转轴Ra与形成大致圆筒状的洗涤槽4的中心轴Rb一致。即，旋转翼5的旋转轴Ra也与外槽3的中心轴一致，与外槽3同样从铅直轴(z轴)向前侧倾斜。此处，以铅直轴(z轴)为基准将旋转轴Ra以及洗涤槽4的中心轴Rb的倾斜度定义为倾斜角θ。倾斜角θ越大，越能降低洗涤槽4的开口边缘43的前侧43a，能容易地进行洗涤对象物的取出投入。在该图1所示的例子中，虽然将倾斜角θ设定为12°，但是该倾斜角θ像后述那样不局限于12°。
驱动单元6固定于外槽3的下方，具有：通过接受电力的供给而进行旋转的电动机61、减速机62、以及通过电动机61的转矩进行旋转的第一输出轴63以及第二输出轴64。电动机61作为无刷电机而构成，线圈与一般的电机同样采用铜式。另外，该电动机61也是由逆变器驱动的逆变器电机，通过由未图示的 逆变器控制施加频率和电压，能进行效率良好的控制。
第二输出轴64形成圆筒形，与第一输出轴63同轴地配置。第一输出轴63贯穿到洗涤槽4的内部，顶端嵌入形成于旋转翼5的轴套部51(参照图3)，由安装螺丝65固定。因此，旋转翼5与第一输出轴63一体地进行旋转。第二输出轴64的顶端固定于洗涤槽4的底板41。因此，洗涤槽4与第二输出轴64一体地进行旋转。
上述电动机61设有未图示的离合器机构，通过进行该离合器机构的接通断开，能切换由电动机61的转矩只使第一输出轴63旋转的第一运转方式和使两输出轴63、64同时旋转的第二运转方式。进而，在第一运转方式中，电动机61的转矩能经由减速机62传递给第一输出轴63，使其以低速高转矩运转。上述第一运转方式与在使洗涤槽4停止的状态下使旋转翼5旋转的洗涤时的运转、第二运转方式与使洗涤槽4和旋转翼5同时高速旋转的脱水时的运转分别对应。
图2是表示上述旋转翼5的立体图，图3是从旋转轴方向观察该旋转翼5的表面侧的图。此处，旋转翼5的表面侧是指位于安装于洗涤槽4(参照图1)时的上方的位置处，与洗涤对象物接触的一侧。而且，图4(a)、(b)、(c)分别是图3的A-A位置、B-B位置、C-C位置上的剖视图。
如这些图2～图4所示，本实施方式中的旋转翼5为形成大致以旋转轴Ra为中心的圆盘状的旋转翼，具体而言基于形成为圆盘状的圆盘部5A，其表面侧的面(表面)上一体地形成了轴套部51、搅拌叶片52以及突出部53。
轴套部51是将旋转翼5安装于第一输出轴63(参照图1)的部件，形成于旋转翼5的中心处。轴套部51比圆盘部5A更往旋转轴Ra的轴向突出，比其他部分的厚度更大地形成，并且其中央设有用于从背面侧插嵌第一输出轴63(参照图1)的贯穿孔51a。因此，如上所述，通过将第一输出轴63(参照图1)从背面侧插嵌入该贯穿孔51a，将安装螺丝65拧入设于第一输出轴63的顶端的螺纹孔(未图示)(参照图1)，能将旋转翼5固定于第一输出轴63。
搅拌叶片52与轴套部51同样设于旋转翼5的表面侧，与轴套部51同样从圆盘部5A往旋转轴Ra的轴向突出。更具体而言，搅拌叶片52从轴向观察，在从旋转轴Ra往圆盘部5A的径向且往朝向外缘的方向错位了的位置处的中心Cw周围设有五个搅拌叶片52a～52e，这些搅拌叶片52a～52e从中心Cw向旋转翼5的外圆周呈放射状地延伸。以下，在指出指定的搅拌叶片进行说明的情况下使 用搅拌叶片52a～52e的附图标记，在无需特别区分的情况下使用搅拌叶片52的附图标记。在本实施方式中，从旋转轴Ra到搅拌叶片52的中心Cw的距离d设定为旋转翼5的半径的约1/3。此外，如图3所示，各搅拌叶片52以随着朝向外圆周渐渐顺时针前进的方式弯曲。
另外，各搅拌叶片52在从中心Cw朝向外圆周延伸期间相对于轴向略微凸出地弯曲地形成。具体而言，在中心Cw附近略微使轴向的高度小，在朝向外圆周延伸的中间使轴向的高度最大，在外圆周附近再次使轴向的高度小。
如上所述由于五个搅拌叶片52a～52e设置为向旋转轴Ra的轴向突出，因此在搅拌叶片52、52彼此之间各自形成轴向的高度变低的凹部54。像这样在旋转翼5的表面侧，由于通过形成于搅拌叶片52a～52e和它们之间的各凹部54形成有凹凸，通过在该凹凸之间使洗涤对象物旋转，可提高清洗作用。进而，由于搅拌叶片52a～52e的长度各自不同，各搅拌叶片52a～52e碰撞洗涤对象物的角度不同，因此洗涤对象物由各搅拌叶片52a～52e清洗的部分各自不同，可进一步提高洗涤性能。
另外，在上述凹部54中也具备广阔区域的搅拌叶片52d、52e之间的凹部54；搅拌叶片52e、52a之间的凹部54；以及搅拌叶片52a，52b之间的凹部54分别形成有在外圆周附近略微向轴向突出的折流板部55。因此，在这些凹部54的内部，通过使折流板部55与洗涤对象物抵接，能进一步提高洗涤性能。
进而，圆盘部5A在与各凹部54对应的位置处设有用于在表面侧和背面侧之间通过水流的多个贯穿孔56。
搅拌叶片52a～52e之中的一个搅拌叶片52a从中心Cw经由旋转轴Ra上朝向外圆周延伸地形成，与上述轴套部51的一部分共享。因此，轴套部51即使不特别地大型化也能确保强度，旋转翼5利用该轴套部51稳固地安装于第一输出轴63(参照图1)。另外，与将轴套部51配置于多个搅拌叶片52之间的情况相比，能防止搅拌叶片52、52之间的凹部54变小，能确保洗涤对象物滚动运动的空间并抑制洗涤性能的降低。
突出部53为设于作为上述的多个搅拌叶片52a～52e的基端部的中心Cw的部件，从圆盘部5a朝向表面侧沿着旋转轴Ra的轴向突出。此处，将突出部53的突出量Hp定义为沿着与旋转轴Ra平行的方向的圆盘部5A的表面侧的面(表面)和突出部53顶端之间的最大尺寸(参照图4)。而且，为了与此对比，同样 定义搅拌叶片52的突出量Hb(参照图4)。在本实施方式中，虽然将突出部53的突出量Hp设定为搅拌叶片52的突出量Hb的约1.5倍，但是也可以适当地变更该尺寸。
另外，各搅拌叶片52a～52e与突出部53平滑地连接。而且，由于突出部53的顶端形成为平滑的部分球面状，因此在与洗涤对象物抵接使其移动的情况下，不会对该洗涤对象物产生损伤，能理想地进行洗涤。
突出部53如上述所述，设定为比搅拌叶片52还要大的突出量Hp，然而由于设于比旋转轴Ra更往外径方向错位距离d的位置，因此能由该突出部53使洗涤对象物高效地动作，能由多个搅拌叶片52配合形成于旋转翼65的表面的凹凸所产生的效果，高效地进行洗涤。
另外，根据发明人的见解，只要增大距离d就能进步一步提高洗涤对象物的搅拌效果。因此，在增大旋转轴Ra(中心轴Rb)的倾斜角θ(参照图1)的情况下，虽然存在因重力而使洗涤对象物偏向洗涤槽4的一方的倾向，但即使在这样的情况下也能通过突出部53所产生的搅拌效果，理想地进行洗涤。因此，对应倾斜角θ的大小变更距离d也是适宜的。另外，对应倾斜角θ的大小变更突出部53的突出量Hp也是适宜的。
关于旋转翼5的背面侧，如图4(a)～(c)所述，进行了用于轻量化的壁厚减薄、用于强度提高的筋的形成。
本实施方式的洗衣机1虽然是具备上述结构的洗衣机，但也能变更图1所示的倾斜角θ而构成(参照图)。
图5以及图6是表示变更为与图1不同的倾斜角θ的例子的纵剖图。在图1中，虽然设为θ＝12°的状态，但是也可以如图5(a)所示设为θ＝0°，如图5(b)所示设为θ＝6°，如图6所示设为θ＝20°。
图5(a)、(b)、以及图6中分别记载的例子是根据图1中记载的例子变更了涤槽4的倾斜角θ，并且与洗涤槽4的开口边缘43的倾斜度一起变更了主体2的顶板23的角度的例子。此外，为了分别变更洗涤槽4的倾斜角θ，适当地变更了吊棒7的长度、外槽3的卡合位置。
图5(a)、(b)所示的例子与图1中记载的例子相比，虽然倾斜角θ变小的部分在从洗涤槽4取出投入洗涤对象物的容易度这一点上略微不利，但是如后述所述，在耗电、洗涤性能这一点上能得到几乎不变的效果。另一方面，图6 所示的例子与图1中记载的例子相比，使倾斜角θ变大的部分，在从洗涤槽4取出投入洗涤对象物这一点上更有利，并且如后所述在耗电和洗涤性能这一点上也能得到相同的效果。
以下，将由更具体化了本实施方式的洗衣机1的图1、图5(a)、图5(b)、以及图6的方式构成的本发明的实施例的评价结果与比较例对比进行说明。
图12(a)、(b)是分别表示在与本发明的实施例进行比较的比较例1中使用的旋转翼105、在比较例2中使用的旋转翼205的图。这些图是与图3对应的图，时从旋转轴方向观察旋转翼105、205的表面侧的图。对与图3共用的部分赋予相同的附图标记并省略了详细的说明。此外，图12所示的旋转翼105、205设定为与图3所示的旋转翼5相同的外径尺寸。
在图12所示的比较例1中使用的旋转翼105是现有的平常使用的部件，圆盘部105A的中央部形成有轴套部51，以该轴套部51为中心呈放射状形成有五个搅拌叶片152。即，旋转翼105的旋转轴Ra与五个搅拌叶片152的中心Cw一致。另外，邻接的搅拌叶片152、152之间分别形成有折流板部55以及贯穿孔56。此外，搅拌叶片152的突出量Hb(参照图4)和折流板部55的形状设定为与本实施方式的洗衣机1中的旋转翼5(参照图1～4)相同。
比较例2中使用的旋转翼205是在上述比较例1所使用的旋转翼105上设置了突出部253的旋转翼。具体而言，在与搅拌叶片152之中的一个搅拌叶片152a重叠的位置处，共享一部分并设有突出部253。突出部253的中心和旋转轴Ra的距离与上述实施方式中的旋转翼5(参照图3)相同，设定为旋转翼205的半径的约1/3。另外，关于突出部253的突出量Hp也设定为与上述的旋转翼5(参照图1～4)相同。
比较例1以及比较例2以图1、图5(a)、以及图5(b)所示的洗衣机1为基础，代替构成该洗衣机的旋转翼5(参照图1～4)，分别组装了上述旋转翼105、205并进行了评价。即，与实施例的一部分相同，以倾斜角θ＝0°、6°、12°这三个标准实施了评价。
洗衣机1的评价基于由一般社团法人日本电气工业会(JEMA)规定的洗衣机性能评价基准进行，评价项目设为耗电量、洗净比、以及清洗不均这三项。
与取样上述三项评价项目的数据匹配，实验条件以上述洗衣机性能评价基准所述的洗涤性能评价方法为基准进行了设定。即，将包含湿式人工污渍布(以 下，称为“污渍布”。)的规定量的试验布、水、洗剂按规定顺序投入并进行运转。此时，试验条件设为：水温20℃、水质硬度40ppm(mg/L)、只进行10分钟的清洗过程。进而，试验布的量设为4kg、8kg这两个水准，在将试验布设为4kg的情况下将水量设定为47L，在将试验布设为8kg的情况下将水量设定为60L。对于使用的洗涤剂，使用同样的市售合成洗涤剂，各自根据水量投入规定量。
在上述的条件下所进行的运转时，将由累计电力计测量的值设为耗电量(wh)。此外，该耗电量主要是构成上述的驱动单元6的电动机61所消耗的电量。进而，根据运转前后的污渍布的反射率和同类布样的反射率计算出清洗度，求得作为与标准洗衣机的清洗度之比的洗净比。进而，求得清洗度的标准偏差，求得作为与标准洗衣机的清洗度的标准偏差之比的清洗不均。洗净比以及清洗不均可以说是表现洗衣机的洗涤性能(清洗性能)的指标。
此外，虽然耗电量的值越小越好这一点自不待言，但是洗净比的值越大越好，清洗不均的值越小越好。但是，由于JEMA规定的洗衣机性能评价基准规定了洗净比0.8以上、清洗不均3以下为目标清洗性能，因此在本实施方式中也以此为基准。
图7、8是总结了进行了上述条件下的运转的结果的图，是将图1、5所示的本实施例的洗衣机1的评价结果与比较例一起示出的图。
图7(a)是在试验布4kg的条件下，在倾斜角θ＝0°(参照图5(a))的设定下，将具备本实施方式的旋转翼5(参照图1～4)的实施例的洗衣机1和旋转翼105(参照图12(a))的比较例1的洗衣机1的评价结果制成表的图。在该结果中，实施例与比较例1相比耗电量大幅降低。另外，虽然洗净比、清洗不均比起比较例1略微逊色，但是满足上述的目标清洗性能。
图7(b)是示出根据图7(a)的情况，变更为倾斜角θ＝12°(参照图1)的设定的情况的评价结果的图。在这种情况下，实施例与比较例1相比耗电量也大幅降低。另外，满足洗净比、清洗不均以及上述的目标清洗性能，其中虽然清洗不均比起比较例1略微逊色，但是洗净比变得比比较例1更好。
图8(a)是在试验布8kg的条件下，在倾斜角θ＝0°(参照图5(a))的设定下，将具备本实施方式的旋转翼5(参照图1～4)的实施例的洗衣机、具备旋转翼105(参照图12(a))的比较例1的洗衣机1、以及具备旋转翼205(参照图12(b))的比较例2的洗衣机1的评价结果制成表的图。同样，图8(b) 是表示在试验布8kg的条件下，设定倾斜角θ＝6°(参照图5(b))的情况的评价结果的图，图8(c)是表示在试验布8kg的条件下，设定倾斜角θ＝12°(参照图1)的情况的评价结果的图。图8(d)是在试验布8kg的条件下，设定倾斜角θ＝20°(参照图1)的情况下的将具备本实施方式的旋转翼5(参照图1～4)的实施例的洗衣机1单个的评价结果制成表的图。
进而，图9、10、11是基于图8(a)～(d)的内容，将横轴设为倾斜角θ，将纵轴设为耗电量，作为洗净比或者清洗不均以图表的方式表现的图。
当试着着眼于图9所示的耗电量时，在倾斜角θ＝0～12°的范围内，实施例比起比较例1、2耗电量小10％左右。同样，虽然只是实施例的评价结果，但可以理解在倾斜角设为θ＝20°的情况下耗电量足够小。具体而言，虽然在实施例中将倾斜角设为θ＝20的情况下耗电量最大，但是即使与比较例1、2中的倾斜角θ＝0～12°的结果相比耗电量也足够小。这样，实施例由于进行了评价的在所有的倾斜角θ＝0～20°的范围内几乎相同地得到耗电量变小的倾向，因此对于耗电量旋转翼5的形状所产生的影响大，可以说通过使用本实施方式的旋转翼5(参照图1～4)能理想地降低耗电量。
即，如图2～4所示，通过将多个搅拌叶片52的中心Cw设于比旋转轴Ra更往与外径方向错位的位置，并且在中心Cw设置比搅拌叶片52更往旋转轴Ra的轴向突出的突出部53，从而能使洗涤槽4内的水、洗涤对象物的动作高效地进行，可降低电动机61所产生的耗电量。
另外，当着眼于图10所示的洗净比时，实施例在倾斜角θ＝0～20°的全范围内取得了超过作为目标清洗性能的洗净比0.80的值。即，实施例在像上述那样能使耗电量降低之外，还能得到超过目标的洗净比。
但是，实施例中的洗净比在倾斜角θ＝0°时比起比较例1、2略微变小，在倾斜角θ＝6°时变成几乎同等的水平，在倾斜角θ＝12°时比起比较例1、2更大。另外，将倾斜角θ＝12°设为峰值，虽然当倾斜角θ＝20°时洗净比再次变低，但是即使在该倾斜角θ＝20°的情况下，也维持了平均的比较例1、2中的洗净比同等以上的水平。即，从洗净比的观点来看，虽然能在所有的倾斜角θ的范围内理想地适用，但是其中还能在倾斜角θ＝6°～20°的范围内更理想地适用。进而，由于倾斜角θ＝12°附近能实现更大的洗净比，因此能更进一步理想地适用。
另外，在具备与现有相同的旋转翼105的比较例1中，相对于随着倾斜角θ 从0°增大到12°，洗净比渐渐略微降低，在实施例中洗净比存在大幅增大的倾向。进而，在具备突出部253比较例2中，通过使倾斜角θ从6°增加到12°，洗净也存在大幅增大的倾向。由此，可以理解通过将倾斜角θ设定为超过0°，特别是设定为12°附近的较大值这一点与设置突出部53(253)的结构的叠加效应，洗净比增加。
从发明人的评价时的观察来看，能推测出突出部53(253)往与倾斜相反的方向抬起洗涤对象物，洗涤对象物存在沿着倾斜滚动运动的倾向，通过这样的洗涤对象物的运动提高了洗净比。进而，可以想象上述的洗涤对象物的移动所产生的效果如实施，通过将搅拌叶片52的中心Cw从旋转轴Ra错位能进一步提高。因此，与该效果相匹配，可以想象实施例在倾斜角12°时可得到最大的洗净比。从这样的倾向以及推测的作用效果考虑，即使将倾斜角θ设为比12°更大，也能期待得到更大的洗净比。
进而，当着眼于图11所示的清洗不均时，实施例在倾斜角θ＝0～20°的全范围内得到作为目标清洗性能的清洗不均3以下的值。即，除了像上述那样能使耗电量降低之外，对于清洗不均也能得到良好的性能。
但是，实施例中的清洗不均在倾斜角θ＝0°、6°时比起比较例1、2略微大，在倾斜角θ＝12°时为与比较例1、2同等的水平。倾斜角20°虽然只有实施例的评价结果，但是具有与倾斜角θ＝12°同等程度的良好的水平。即，能在所有的倾斜角θ的范围内理想地适用，其中通过将倾斜角θ设为12～20°附近，也能更理想地适用。
像上述那样，本实施方式的洗衣机1以洗净比、清洗不均为目标清洗性能的范围，并且能进行大幅度的耗电量的降低。因此，在照样利用上述的结构的情况下，能期待降低运转成本。
另外，得到耗电降低的效果的部分，只要允许采用效率低的电动机61，也能通过使用通用电机实现制造成本的降低。另外，也可以考虑将线圈从铜式变更为铝式，在这样的情况下，与使用通用电机的情况相同，能实现制造成本的降低。
以上，虽然关于本发明的实施方式进行了说明，但是各部的具体的结构不仅限于上述的实施方式。
例如，在上述的实施方式中，虽然将洗涤槽兼做脱水槽的功能意即作为洗 涤脱水槽构成，但是能作为不具有作为洗涤槽的功能的单纯的洗涤槽4构成，在这种情况下也可以适用于本发明并得到与上述相同的效果。在这种情况下，不需要外槽3，并且不需要通过驱动单元6使洗涤槽4旋转。
进而，在上述实施方式中，虽然使旋转轴Ra相对于铅直轴(z轴)平行或者倾斜，但是在将倾斜角θ设为90°的，即洗涤槽4在水平方向上开口的，意即滚筒洗衣机中也能应用上述的旋转翼5。
附图标记说明
1：洗衣机；4：洗涤槽；5：旋转翼；6：驱动单元；51：轴套部；52、52a～52e：搅拌叶片；53：突出部；Cw：(多个搅拌叶片的)中心；Ra：旋转轴；Rb：(洗涤槽的)中心轴；θ：倾斜角。

Claims (4)

  1. 一种洗衣机，具备：大致有底筒状的洗涤槽；旋转自由地设置于该洗涤槽的底部的旋转翼；以及通过接受电力供给而旋转驱动所述旋转翼的驱动单元，所述旋转翼形成为以旋转轴为中心的圆盘状，并且其表面设有朝着外圆周呈放射状延伸的多个搅拌叶片，所述洗衣机的特征在于，
    所述多个搅拌叶片的中心设于比所述旋转轴更往外径方向错位的位置，并且所述多个搅拌叶片的中心处设有比这些搅拌叶片更向所述旋转轴的轴向突出的突出部。
  2. 根据权利要求1所述的洗衣机，其特征在于，使所述旋转翼的旋转轴与洗涤槽的中心轴大致一致，并且使所述中心轴相对于铅直轴倾斜。
  3. 根据权利要求2所述的洗衣机，其特征在于，将相对于所述中心轴的铅直轴倾斜的倾斜角设定为6～20°的范围。
  4. 根据权利要求1～3的任一项所述的洗衣机，其特征在于，所述突出部的顶端形成为部分球面状。
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