JP2016185267A - Agitation blade for washing machine and washing machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitation blade for washing machine capable of dissolving a powder detergent, washing soap and the like quickly while suppressing damage on clothing, with a simple structure.SOLUTION: An agitation blade for washing machine includes: an agitation blade body (501) having blade parts (510, 520) for agitating water and laundries by rotation; an agitation blade part (600) arranged in the central part of the agitation blade body (501), and for rotating integrally with the agitation blade body (501); and a lid body (700) for covering the agitation blade part (600) so as to prevent contact between laundries and the agitation blade part (600). The agitation blade part (600) has a plurality of blades for imparting a shearing force to water. The lid body (700) has a plurality of through-holes (704).SELECTED DRAWING: Figure 12

Description

  The present invention relates to a stirring blade for a washing machine and a washing machine using the same.

  A conventional stirring blade has a blade part (including a raised part) mainly serving to generate a water flow. By rotating such a stirring blade, the object to be stirred hits the blade part (including the raised part) and is stirred, or is stirred by receiving the centrifugal force generated by the rotation.

  The agitating blade is devised not to give a shearing force as much as possible to the water flow so as not to damage the laundry moved on the flow like the pulsator of the washing machine.

  However, in the conventional stirring blade for a washing machine, there is a trade-off relationship between less cloth damage and ease of dissolving the powder detergent. That is, in order to suppress cloth damage, the surface of the stirring blade is formed as smoothly as possible in order to suppress the shearing force applied to water and the cloth. On the other hand, in order to dissolve the powder detergent well, it is formed so as to sharpen the shape of the blade portion of the stirring blade in order to enhance the shearing force applied to the water and the powder detergent. According to such a trade-off relationship, if the fabric damage is suppressed, the powder detergent remains undissolved, while if the powder detergent is easily dissolved, the fabric damage becomes severe.

  In order to solve this problem, the use of liquid detergents is recommended. However, since liquid detergents are expensive, there is a strong social demand to use cheap powder detergents and laundry soaps from an economical point of view. There is.

  In addition, recent liquid detergents are made with strong chemicals to reduce usage fees and are highly irritating to human skin. For example, people with atopic dermatitis are less irritating powder detergents. There is a demand to use laundry soap.

  In addition, since the powder detergent and laundry soap are difficult to dissolve in water, there is a problem that the powder detergent and laundry soap remain undissolved, and the concentration of the detergent contained in the wash water is lowered and the detergency is reduced.

  In addition, undissolved residue of powder detergent and laundry soap accumulates on the stirring blade and the wall surface and bottom of the washing machine, and there is a problem that germs such as black mold propagate there and contaminate the stirring blade or the washing machine. . This is a fatal problem for a stirring blade of a washing machine.

  As an agitating blade for a conventional washing machine that can dissolve such powder detergent and laundry soap relatively easily, the rotational force is transmitted via a gear to the axial fan provided in the pulsator, and the axial fan There is an apparatus in which a water flow is ejected from the center of the pulsator by rotating the pulsator to reinforce the water flow (see, for example, JP-A-10-57675 (Patent Document 1)).

Japanese Patent Laid-Open No. 10-57675

  However, the stirring blade for the washing machine has a problem in that the number of parts of the driving unit of the axial fan increases and the structure becomes complicated, so that the cost and the failure rate increase. In particular, since the agitating blade for a washing machine is provided at the bottom of the washing tub, if it has a complicated structure, yarn waste, detergent baskets, and the like stored at the bottom are caught in the axial fan and are likely to fail.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stirring blade for a washing machine that can dissolve powder detergent, laundry soap, and the like quickly while suppressing damage to clothing with a simple configuration.

  Another object of the present invention is to provide a washing machine that can suppress the growth of black mold and bacteria by using the stirring blade for the washing machine, and can increase the concentration of the detergent contained in the washing water to improve the washing power. There is to do.

In order to solve the above problems, a stirring blade for a washing machine of the present invention is:
A stirring blade body having a blade portion for stirring water and laundry by rotation;
A stirring blade portion disposed in a central portion of the stirring blade body and rotating integrally with the stirring blade body;
A lid that covers the stirring blade so as to prevent contact between the laundry and the stirring blade,
The stirring blade part has a plurality of blades that give shearing force to water,
The lid body has a plurality of through holes.

Moreover, in the stirring blade for a washing machine of one embodiment,
The radius R of the edge of the blade portion of the stirring blade body is 2 mm or more, and the diameter of the stirring blade body is 300 mm or more.

Moreover, in the stirring blade for a washing machine of one embodiment,
The radius R of the edges of the plurality of blades of the stirring blade portion is 2 mm or less, and the diameter of the stirring blade portion is 1/2 or less of the diameter of the stirring blade body.

Moreover, in the stirring blade for a washing machine of one embodiment,
The width | variety of the said blade | wing part of the said stirring blade main body is 10 mm or more.

Moreover, in the stirring blade for a washing machine of one embodiment,
The width of the plurality of blades of the stirring blade portion is 10 mm or less.

Moreover, in the stirring blade for a washing machine of one embodiment,
The lid is arranged so that at least a part thereof is connected to an extended line of a ridge line extending in the radial direction of the blade part of the stirring blade body.

Moreover, in the stirring blade for a washing machine of one embodiment,
While providing a plurality of protrusions on the surface of the lid,
The plurality of through holes are provided in a region excluding the plurality of protrusions of the lid.

Moreover, in the stirring blade for a washing machine of one embodiment,
The stirring blade body and the lid were formed integrally.

The washing machine of the present invention
It has a stirring blade for any one of the above washing machines.

  As is clear from the above, according to the present invention, it is possible to realize a stirring blade for a washing machine that can dissolve powder detergent and laundry soap quickly with a simple configuration while suppressing damage to clothing. it can.

  In addition, according to the present invention, a washing machine that can suppress the growth of black mold, germs, and the like, and increase the concentration of the detergent contained in the washing water and improve the washing power by using the stirring blade for the washing machine is realized. can do.

FIG. 1 is a longitudinal sectional view of a washing machine using a stirring blade according to a first embodiment of the present invention. FIG. 2 is a perspective view of the stirring blade. FIG. 3 is a top view of the stirring blade. 4 is a longitudinal sectional view taken along line IV-IV in FIG. FIG. 5 is a longitudinal sectional view taken along line VV in FIG. FIG. 6 is a diagram for explaining the water flow caused by the rotation of the stirring blade. FIG. 7 is a schematic view showing a water flow generated in the stirring tank of the washing machine. FIG. 8 is a top view of the stirring blade of the second embodiment of the present invention. FIG. 9 is a perspective view showing a modification of the stirring blade of the second embodiment. FIG. 10 is a perspective view of a stirring blade according to a third embodiment of the present invention. FIG. 11 is a perspective view of a stirring blade according to a fourth embodiment of the present invention. FIG. 12 is an exploded perspective view of a stirring blade according to a fifth embodiment of the present invention. FIG. 13 is a perspective view of the screw of the stirring blade as viewed obliquely from above. FIG. 14 is a perspective view of the screw of the stirring blade as viewed obliquely from below. FIG. 15 is a perspective view of the protective cover of the stirring blade as viewed obliquely from above. FIG. 16 is a top view of the stirring blade. 17 is a longitudinal sectional view taken along line XVII-XVII in FIG. FIG. 18 is a perspective view of the stirring blade. FIG. 19 is a top view of the stirring blade with the protective cover removed. FIG. 20 is a side view of the stirring blade. FIG. 21 is a rear view of the stirring blade. FIG. 22 is a top view of the stirring blade with the protective cover and screw removed. FIG. 23 is a view for explaining a water flow when the stirring blade is rotated clockwise as viewed from above. FIG. 24 is a view for explaining a water flow when the stirring blade is rotated counterclockwise as viewed from above. FIG. 25 is a top view of the stirring blade of the sixth embodiment of the present invention. FIG. 26 is a perspective view of the screw of the stirring blade as viewed obliquely from above. FIG. 27 is a side view of the main part including the screw. FIG. 28 is a schematic view showing a vertical vortex generated by the blade of the screw. FIG. 29 is a top view of the stirring blade of the seventh embodiment of the present invention. FIG. 30 is a graph showing the relationship between the ratio of the screw and the cleaning rate in the evaluation of the cleaning performance. FIG. 31 is a table showing the ratio of the washing rate to the washing rate in 0.5 kg of laundry. FIG. 32 is a table showing the ratio of the washing rate to the washing rate of 4.5 kg.

  Hereinafter, the agitating blade for a washing machine and the washing machine of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 is a longitudinal sectional view of a washing machine 1 using a stirring blade 100 according to a first embodiment of the present invention.

  As shown in FIG. 1, the washing machine 1 according to the first embodiment is of a fully automatic type and includes an outer box 10 made of metal or synthetic resin. The outer box 10 is formed in a rectangular parallelepiped shape, and its upper surface and bottom surface are openings. A synthetic resin upper surface plate 11 provided with an operation panel or the like is fixed to the upper surface opening of the outer box 10. A synthetic resin base 12 is fixed to the bottom opening of the outer box 10 with screws (not shown). Legs 13 for supporting the outer box 10 on the floor are provided at the four corners of the base 12.

  The upper surface plate 11 is provided with a laundry input port 14 for inputting laundry (an example of an object to be stirred) into the washing machine 1. The upper lid 15 is rotatably attached to the upper surface plate 11 by a horizontal rotation shaft on the heel side of the washing machine 1. By rotating the upper lid 15 up and down to open and close the laundry input port 14, the laundry is input into the agitation tank 30 accommodated in the outer box 10, and the laundry is discharged from the agitation tank 30. It can be taken out.

  Inside the outer box 10, a stirring tank 30 and a water tank 20 for storing the stirring tank 30 are housed. The agitation tank 30 stores washing water such as water in which detergent is dissolved or rinsing water. Each of the water tank 20 and the agitation tank 30 has a shape of a bottomed cylindrical cup having an open top surface, and is concentrically with the water tank 20 on the outside and the agitation tank 30 on the inside with the axis line vertical. Be placed. The washing water is an example of a fluid.

  The water tank 20 is suspended from the outer box 10 by a suspension member (not shown). The suspension members are provided at a total of four locations in such a manner as to connect the lower outer surface of the water tank 20 and the inner corners of the outer box 10. The suspension member supports the water tank 20 so that it can swing within the horizontal portion.

  The agitation tank 30 has a peripheral wall 30b that extends in a tapered shape from the bottom wall 30a upward. In the peripheral wall 30b, a plurality of dewatering holes 31 are annularly arranged at the top. The peripheral wall 30b does not have an opening for allowing liquid to pass except for the plurality of dewatering holes 31. That is, the stirring tank 30 is a so-called “no hole” type.

  In the following description of the embodiment, a “no-hole” type stirring tank 30 will be described as an example. However, even in a hole-type stirring tank, the configuration of the present invention can be implemented as it is.

  In addition, an annular balancer 32 is attached to the edge of the upper opening of the agitation tank 30 so as to suppress vibration when the agitation tank 30 is rotated at a high speed in order to dehydrate the laundry. On the inner bottom surface of the stirring tank 30, a stirring blade 100 for causing the washing water to flow in the tank is rotatably disposed.

  A drive unit 40 is attached to the lower surface of the water tank 20. The drive unit 40 includes a motor 41, a belt mechanism 42 that transmits the rotational output of the motor 41, and a clutch / brake mechanism 43, and a dehydrating shaft 44 and a stirring blade shaft 45 that are arranged coaxially from the center thereof. Protrudes upward. The dewatering shaft 44 and the stirring blade shaft 45 have a double shaft structure in which the dewatering shaft 44 is disposed outside and the stirring blade shaft 45 is disposed inside. The dehydrating shaft 44 penetrates the bottom surface of the water tank 20 from below to above and supports the stirring tank 30. The stirring blade shaft 45 penetrates the water tank 20 from below to above, and further penetrates the bottom wall 30 a of the stirring tank 30 to support the stirring blade 100.

  The stirring blade 100 rotates at 55 to 300 rpm and performs washing or rinsing. At the time of dehydration, the dehydration is performed by rotating at 0 to 1200 rpm together with the stirring tank 30. Seal members for preventing water leakage are disposed between the dewatering shaft 44 and the water tank 20 and between the dewatering shaft 44 and the stirring blade shaft 45, respectively.

  A water supply valve (not shown) that opens and closes electromagnetically is disposed in the space in the top plate 11. A water supply hose (not shown) for supplying tap water such as tap water is connected to the connection pipe 51 that is connected to the upstream side of the water supply valve and protrudes upward through the upper surface plate 11. Further, the downstream side of the water supply valve is connected to a container-like water supply port (not shown) arranged at a position facing the inside of the agitation tank 30.

  A control unit 70 is provided in the top plate 11. The control unit 70 receives an operation command from a user through an operation display unit (not shown) provided on the upper surface of the upper plate 11 and issues an operation command to the drive unit 40, the water supply valve and the drain valve 68. In addition, the control unit 70 issues a display instruction for the operation content such as the operation course and the time required for each process to the operation display unit.

  A drain hose 60 for draining the water in the water tank 20 and the stirring tank 30 out of the outer box 10 is attached to the bottom of the water tank 20. Water flows into the drainage hose 60 from a drainage port 61 opened at the bottom of the water tank 20. The water discharged to the outside of the agitation tank 30 at the time of dehydration is caused to flow to the drain hose 60 through a water distribution pipe (not shown).

  In addition, a packing (not shown) is sandwiched between the agitation tank 30 and the water tank 20 to prevent water leakage from the center. A seal holder 63 is attached to the center of the bottom surface of the water tank 20. A drainage path including the drain outlet 61 is formed between the seal holder 63 and the water tank 20. Four drain holes 67 are provided on the circumference of the bottom of the stirring tank 30, and the drain holes 67 guide water in the stirring tank 30 from the drain port 61 to a drain valve 68 that electromagnetically opens and closes. An oil seal (not shown) is press-fitted inside the seal holder 63. The oil seal seals the stirring tank 30, so that the stirring tank 30 is rotatable and has a watertight structure, and an independent drainage space 66 is formed between the water tank 20 and the stirring tank 30.

  Due to the structure of the washing machine 1, the water in the agitation tank 30 is stopped by the drain valve 68 during washing when the agitation blade 100 rotates, and water is stored only in the agitation tank 30. At this time, water does not accumulate between the agitation tank 30 and the water tank 20. Thereby, high water saving is realized at the time of washing. When performing dehydration, the drain valve 68 is opened, and the water in the agitation tank 30 is drained to the outside. At this time, the dehydrating shaft 44, the stirring blade shaft 45, and the stirring tank 30 are rotated by the drive of the motor 41, but the stirring tank 30 and the seal holder 63 can be relatively rotated by the oil seal and can keep a watertight structure.

  The stirring blade 100 and the stirring tank 30 constitute a stirring device.

  Next, the stirring blade 100 will be described.

  FIG. 2 is a perspective view of the stirring blade 100. As shown in FIG. 2, the stirring blade 100 has a disk shape with a diameter of 400 mm, and is formed in a tray shape that becomes deeper toward the center with respect to the peripheral edge portion 100a. On the surface of the stirring blade 100, a blade portion 110 and a blade portion 120, which are alternately arranged radially in the circumferential direction at a central angle of 90 °, are formed so as to protrude. Further, four concave portions 102 that are adjacent to the blade portions 110 and 120 in the circumferential direction are provided. The diameter of the stirring blade 100 may be set as appropriate according to the configuration of the washing machine 1 and the like.

  The two blade portions 110 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the middle between the inner periphery and the outer periphery in the radial direction is the highest and swells upward. On the other hand, the two blade portions 120 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the outer peripheral side is the highest and bulges upward.

  The blade portions 110 and 120 are arranged on one surface of the stirring blade 100 and protrude in the axial direction.

  In addition, a plurality of hump-shaped protrusions 111 are provided on the front edge side of the blade portion 110 (when the counterclockwise rotation is a positive rotation) so as to be arranged at equal intervals in the radial direction. The size of the plurality of protrusions 111 of the blade 110 is substantially equal.

  In addition, a plurality of hump-shaped protrusions 121 are provided on the front edge side of the blade portion 120 (when the counterclockwise rotation is positive rotation) so as to be arranged at intervals in the radial direction, and the rear edge side of the blade portion 120 (counterclockwise) A plurality of hump-like protrusions 122 are provided so as to be arranged at regular intervals in the radial direction (when clockwise rotation is positive). The size of the plurality of protrusions 121 of the blade portion 120 is substantially equal.

  A plurality of ribs 103 a are provided on the surfaces of the blade portions 110 and 120 of the stirring blade 100, and a plurality of ribs 103 b are provided on the surface of the recess 102 of the stirring blade 100.

  The ribs 103a and 103b are juxtaposed in the direction in which the washing water flows on the surface of the stirring blade 100 and extend in a direction perpendicular to the direction. Further, on the surface of the stirring blade 100, the interval between the ribs 103a and 103b in the region where the average speed of the washing water flow is large is formed narrower than the interval between the ribs 103a and 103b in the region where the average water flow rate is low. Yes.

  Specifically, a plurality of ribs 103 a extending in the radial direction of the stirring blade 100 are arranged in parallel on the upper surface of the blade portions 110 and 120 in the circumferential direction. At this time, the plurality of ribs 103a are formed so that the interval between the outer peripheral ribs 103a is narrower than the interval between the inner peripheral ribs 103a. A plurality of ribs 103 b extending in the circumferential direction of the stirring blade 100 are arranged in the radial direction on the upper surface of the recess 102. At this time, the rib 103b is curved with respect to an arc centered on the rotation center, and the distance from the rotation center is small at a position close to the blades 110 and 120, and the distance from the rotation center is large at a remote position. Yes. Further, the ribs 103b at positions close to the blade portions 110 and 120 are formed to be narrower than the positions where the intervals are separated.

  FIG. 3 shows a top view of the stirring blade 100. 3, the same components as those of the stirring blade 100 shown in FIG. 2 are denoted by the same reference numerals.

  4 shows a longitudinal sectional view taken along line IV-IV in FIG. 3, and FIG. 5 shows a longitudinal sectional view taken along line VV in FIG. 4 and 5, the same components as those of the stirring blade 100 shown in FIGS. 1 to 3 are denoted by the same reference numerals.

  As shown in FIGS. 4 and 5, the lower surface of the stirring blade 100 is provided with a boss portion 130 having a shaft hole 106 at the center. The tip of the stirring blade shaft 45 (shown in FIG. 1) is inserted into the shaft hole 106 of the boss portion 130. Further, a groove portion 117 is formed on the back side of the two blade portions 110, 110 formed on the surface of the stirring blade 100. Thereby, the blade | wing parts 110 and 110 and the groove part 117 have the front and back integral relationship. Moreover, the open end 117a on the outer peripheral side of the groove 117 faces the peripheral wall 30b (shown in FIG. 1) of the stirring tank 30.

  A thin plate-like blade portion 118 extending in the radial direction protrudes from the bottom of the groove portion 117. The blade portion 118 extends horizontally from the inner end near the center of the stirring blade 100 at a constant height in the radial direction, and then gradually decreases in height on the outer peripheral side with respect to the inner peripheral side as it approaches the outer peripheral end. Is formed. The blade portion 118 having such a shape is suitable for scraping water in the radial direction.

  Similarly, a groove portion 127 (shown in FIG. 5) is formed on the back side of the two blade portions 120, 120, and a thin blade portion (not shown) extending in the radial direction is formed at the bottom of the groove portion 127. ) Is projected.

  Accordingly, the rotation of the stirring blade 100 causes the blade portion 118 on the back side of the blade portions 110 and 110 and the blade portion on the back side of the blade portions 120 and 120 to wash water between the stirring blade 100 and the bottom wall 30 a of the stirring tank 30. To generate a strong water flow on the outer side in the radial direction along the groove 127.

  Next, the water flow by rotation of the stirring blade 100 will be described with reference to FIG.

  In FIG. 6, when the stirring blade 100 rotates counterclockwise, the water flow f <b> 1 from the recess 102 collides with the plurality of protrusions 111 of the blade part 110, and a vertical vortex is formed downstream from each protrusion 111. (The same applies to the plurality of protrusions 121 of the blade portion 120). This vertical vortex generates lift for the downstream water flow f2. By the lifting force with respect to the water flow, the water flow f2 passing through the upper side of the blade portion 110 is restrained from being separated on the downstream side, and the circumferential water flow is strengthened.

  As a result, the circumferential water flow is strengthened, and an outward water flow f3 is generated from the central portion of the stirring blade 100. Therefore, the suction water flow f4 from above is strengthened in the central portion of the stirring blade 100.

  Thus, the water flow in the agitation tank 30 can be strengthened with a simple configuration, and the laundry on the flow in the washing water is more strongly stirred.

  FIG. 7 shows a water flow generated in the agitation tank 30 of the washing machine 1. As shown in FIG. 7, when the stirring blade 100 rotates, a water flow is generated in the circumferential direction by the blade portions 110 and 120 on the upper surface of the stirring blade 100. Further, a water flow is generated in the recess 102 toward the outside in the radial direction along the wall surfaces of the blade portions 110 and 120 at the rear in the rotation direction.

  Further, on the lower surface of the stirring blade 100, groove portions 117 and 127 (shown in FIGS. 3 and 4) form a water channel. Water flows in the radial direction from the inner peripheral side to the outer peripheral side of the grooves 117 and 127 by the centrifugal force (water flow C). At this time, the thin plate-like blade portion 118 of the groove portion 117 and the thin plate-like blade portion of the groove portion 127 function like oar, and water is scraped to the outside, and is strongly directed toward the peripheral wall 30b of the stirring tank 30. A water stream is formed.

  And the water which flowed out from the groove parts 117 and 127 of the stirring blade 100 becomes the water flow Y which goes up along the surrounding wall 30b through the clearance gap between the stirring blade 100 and the surrounding wall 30b. At this time, since the lower end of the peripheral wall 30b is formed in a curved surface, the water flow can be smoothly raised.

  By repeating normal rotation and reverse rotation of the stirring blade 100, a wave whose traveling direction is reversed collides, and a stationary wave that vibrates up and down is formed in the stirring tank 30. The number of antinodes of the standing wave is proportional to the number of blade portions 118.

  Since the space behind the stirring blade 100 is in a negative pressure state after the washing water is pushed out, new washing water is obtained from the plurality of small holes 104 (shown in FIG. 2) near the center of the stirring blade 100. Flows in and a water flow descending downward is generated near the center of rotation above the stirring blade 100. Accordingly, the washing water continuously circulates in the agitation tank 30 by the falling water flow and the rising water flow.

  The standing wave U is a reciprocating water flow that swings in the vertical direction with respect to the water surface, and the reciprocating motion in the vertical direction acts alternately on the laundry. As a result, a vertical shearing force is applied to the laundry, and a mechanical operation such as washing is performed on the laundry. Therefore, the standing wave U contributes to the improvement of the washing effect of the laundry.

  In addition, the laundry is twisted by the rotating water flow X that is a circumferential water flow. In the agitation tank 30, the rotating water flow X and the water flow of the standing wave U act on the laundry at the same time. Thereby, in addition to the shearing force in the vertical direction, twisting in the circumferential direction is added, and the cleaning effect is improved. Further, the laundry is appropriately moved by the rising water flow Y that rises on the outer peripheral side of the stirring tank 30 and the downward water flow Z that flows downward near the rotation center, and a uniform cleaning force acts on the entire laundry.

  Here, since the water flow by the stirring blade 100 is strengthened by the plurality of protrusions 111 of the blade portion 110 and the plurality of protrusion portions 121 of the blade portion 120, the rising water flow Y is strengthened and the height of the standing wave U is Δh. As it increases, the descending water flow Z is also strengthened.

  Therefore, according to the washing machine 1 having the above-described configuration, the stirring action of the laundry can be increased and the cleaning power can be improved. Thereby, washing time can be shortened and the power saving of the washing machine 1 can be achieved. Further, the water flow action of the stirring blade 100 is greatly improved, and the solubility of the detergent is improved, thereby contributing to the improvement of the cleaning effect.

  In this way, when a flow of washing water, which is a fluid, is generated by the rotation of the stirring blade 100, a boundary layer of the washing water is generated on the surface of the stirring blade 100, and a highly viscous region exists in the boundary layer. Therefore, by arranging the ribs 103a and 103b in parallel on the surface of the stirring blade 100, the boundary layer can be destroyed and the frictional resistance can be reduced.

  Between the ribs 103a and the ribs 103b on the surface of the stirring blade 100, a part of the washing water becomes a vortex and stagnates to form a stagnant portion (vortex). Washing water that flows above the ribs 103a and 103b circulates on the upper surfaces of the ribs 103a and 103b and between the ribs 103a and the stagnation portions that stagnate between the ribs 103b. At this time, in addition to the small contact area between the washing water and the upper surfaces of the ribs 103a and 103b, the frictional resistance of the washing water can be reduced by the bearing effect of the stagnant portion.

  A large number of small holes 104 penetrating the stirring blade 100 are provided between the adjacent ribs 103a and between the ribs 103b. The small holes 104 are also provided in the blade portions 110 and 120. The small hole 104 generates a water flow that is sucked into the space behind the stirring blade 100 that becomes negative pressure when the stirring blade 100 rotates.

  According to the stirring blade 100 of the first embodiment, the plurality of protrusions 111 are arranged on the front edge side of the blade portions 110 and 120 where the washing water collides with the rotation of the stirring blade 100 itself so as to be arranged at intervals in the radial direction. , 121 is provided to form a vertical vortex from each protrusion 111, 121 downstream. This vertical vortex generates lift for the washing water. This lifting force against the washing water suppresses the washing water flowing on the upper side of the blade portions 110 and 120 from being separated on the downstream side, thereby strengthening the circumferential water flow. Thereby, by strengthening the flow of washing water with a simple configuration, it is possible to more strongly agitate the laundry that rides the flow of washing water. When the cleaning power is constant, the power consumption for driving the stirring blade 100 can be reduced.

  The plurality of protrusions 111 and 121 are provided, for example, at a position slightly upstream from the axial maximum height position of the blades 110 and 120 serving as a separation point, that is, at a position close to one side in the circumferential direction from the maximum height position. .

  The plurality of protrusions 111 and 121 are provided at locations where the washing water collides and contributes most to stirring (the highest portion of the raised blade portions 110 and 120, the portion rising like a wall, etc.) By generating a vertical vortex from the convex and concave portions (protrusions) by hitting each of the protrusions 111 and 121, new kinetic energy (rotational energy) is given to the washing water and generated from the blades 110 and 120. Physically restrains the peeling that occurs, thereby strengthening the flow of washing water.

  In addition, the plurality of protrusions 111 and 121 can prevent the flow from separating from the maximum height position in the axial direction of the blades 110 and 120, and can enhance the water flow without waste with the electric power to be input. In the washing machine 1 using the stirring blade 100, the cleaning power is enhanced without waste with the electric power supplied.

  Further, the plurality of protrusions 111 and 121 can produce an effect of generating a plurality of vertical vortices and dissolving and washing the powder detergent or laundry soap by the vortices.

  In addition, in the stirring blade that stirs the washing water by rotating in the forward and reverse directions, when a plurality of protrusions are provided on both the front edge side and the rear edge side in the rotation direction of the blade portion, the washing water in either rotation direction is provided. You can strengthen the flow.

  In addition, by stirring the washing water by reversing the stirring blades in the forward and reverse directions, a stationary wave of washing water that vibrates in the vertical direction is generated by colliding with waves having a reverse traveling direction. Due to this standing wave, a vertical shear force is generated in the washing water, and this vertical shear force is further strengthened by the suction flow generated from the protrusion. In addition, by providing the radial blades, a stable water flow can be generated both during forward rotation and during reverse rotation. Moreover, when it is desired to change the water flow during forward rotation and reverse rotation, spiral blades may be provided instead of radial ones.

  The washing machine 1 configured as described above puts the laundry into the agitation tank 30 and supplies water to a predetermined water level by controlling the water supply valve by the control unit 70 that has received a command to start operation. Next, when the washing process starts, the power of the motor 41 is transmitted to the stirring blade 100 through the belt mechanism 42 and the stirring blade shaft 45, and the stirring blade 100 is rotated clockwise and counterclockwise alternately. In accordance with the operation of the stirring blade 100 at this time, the laundry and the washing water in the stirring tank 30 are stirred, and the washing of the laundry proceeds.

  Further, as the height of the plurality of protrusions 111 of the blade part 110 and the plurality of protrusions 121 of the blade part 120 increases, the fabric cloth and the protrusions 111 and 121 collide with each other, and the fabric damage increases. The height of the protrusions 111 and 121 with respect to the interval between the irregularities formed by the protrusions 111 and 121 is set to a height that does not damage the laundry by the protrusions 111 and 121.

  In addition, by providing the radially extending rib 103a on the blade portions 110 and 120 provided radially on the stirring blade 100, the frictional resistance of the washing water on the upper surfaces of the blade portions 110 and 120 can be reduced. .

  Further, by providing a plurality of small holes 104 between the adjacent ribs 103a and between the ribs 103b of the agitating blade 100, a small pressure can be reduced to the space behind the agitating blade 100 that has become negative pressure when the agitating blade 100 rotates. Washing water is sucked through the holes 104.

  In the first embodiment, the plurality of protrusions 122 are provided on the trailing edge side of the blade portion 120 (when the counterclockwise rotation is positive rotation), but the plurality of protrusion portions may not be provided on the trailing edge side of the blade portion.

  Moreover, according to the washing machine 1 of the said structure, when the stirring blade 100 arrange | positioned in the stirring tank 30 rotates, the water flow in the stirring tank 30 can be strengthened and it can stir effectively, and the flow in washing water is carried out. The laundry can be more strongly stirred to improve the cleaning power.

  Note that a stirring blade portion such as a screw that rotates together with the stirring blade 100 may be provided in the central portion of the stirring blade 100 (stirring blade body). A vertical water flow is generated by the stirring blade portion. Accordingly, it is possible to generate a water flow that blows out from the center side of the stirring blade, and it is possible to further strengthen the water flow strengthened by the plurality of protrusions provided on the blade portion. In this case, a lid is provided to cover the stirring blade so as to prevent the laundry from being brought into contact with the stirring blade, and the stirring blade has a plurality of blades that apply shearing force to water, and the lid includes a plurality of lids. Through-holes.

  Further, an opening may be provided at the center of the stirring blade 100. Since the air is sucked in from the lower side of the stirring blade through this opening, the blowout water flow at the center can be strengthened by the water flow strengthened by the vertical vortex generated at the plurality of protrusions of the blade portion. If a plurality of protrusions are provided on both sides of the blade portion, the suction flow in the central portion that occurs at the time of reversal is further strengthened, which may make it difficult to blow out. When it is desired to strengthen only the blowout water flow at the center, it is preferable to provide a plurality of protrusions that function only when blowing out.

  Furthermore, it is possible to prevent the laundry from being damaged by the screw by attaching a cap-shaped protective cover having a plurality of through-holes so as to cover the screw housing portion that houses the screw. By providing a plurality of protrusions on the protective cover, it is possible to obtain an effect of scrubbing the laundry (that is, an effect of scrubbing the laundry with the plurality of protrusions).

[Second Embodiment]
FIG. 8 shows a top view of the stirring blade 200 according to the second embodiment of the present invention. The stirring blade 200 is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment.

  As shown in FIG. 8, the stirring blade 200 has a disk shape with a diameter of 400 mm, and is formed in a tray shape that becomes deeper toward the center with respect to the peripheral edge portion 200a. On the surface of the stirring blade 200, a blade portion 210 and a blade portion 220 that are radially arranged at a central angle of 90 ° are formed to protrude. The blade portions 210 and the blade portions 220 are alternately arranged in the circumferential direction, and are provided with four concave portions 202 adjacent to the blade portions 210 and 220 in the circumferential direction. In addition, you may set the diameter of the stirring blade 200 suitably according to the structure of a washing machine, etc.

  The two blade portions 210 are point-symmetric with respect to the center of rotation, and have a shape in which the vicinity of the middle between the inner periphery and the outer periphery in the radial direction is highest and swells upward. On the other hand, the two blade portions 220 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the outer peripheral side is the highest and bulges upward.

  The blade portions 210 and 220 are arranged on one surface of the stirring blade 200 and protrude in the axial direction.

  In addition, a plurality of hump-like protrusions 211 are provided on the front edge side of the blade portion 210 (when the counterclockwise rotation is a positive rotation) so as to be arranged at intervals in the radial direction. In the plurality of protrusions 211 of the blade portion 210, the interval between the adjacent protrusions 211 gradually decreases from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protrusion 211 is gradually reduced.

  In addition, a plurality of hump-shaped protrusions 221 are provided on the front edge side of the blade portion 220 (when the counterclockwise rotation is a positive rotation) so as to be arranged at intervals in the radial direction. In the plurality of protrusions 221 of the blade part 220, the interval between the adjacent protrusions 221 gradually decreases from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protruding portion 221 is gradually reduced.

  A plurality of ribs 203 a are provided on the surfaces of the blade portions 210 and 220 of the stirring blade 200, and a plurality of ribs 203 b are provided on the surface of the recess 202 of the stirring blade 200.

  A large number of small holes 204 that penetrate the stirring blade 200 are provided between the adjacent ribs 203a and between the ribs 203b. The small holes 204 are also provided in the blade portions 210 and 220. The small hole 204 generates a water flow that is sucked into the space behind the stirring blade 200 that becomes negative pressure when the stirring blade 200 rotates.

  The stirring blade 200 and the stirring tank 30 constitute a stirring device.

  The stirring blade 200 of the second embodiment is different in that the plurality of protrusions 122 of the blade portion 120 of the stirring blade 100 of the first embodiment shown in FIG. 2 is not provided, but the stirring blade 100 of the first embodiment. Has the same effect.

  In addition, the plurality of protrusions 211, 221 is configured such that the interval between the protrusions 211, 221 adjacent to each other gradually decreases from the radially inner side to the radially outer side, and the plurality of protruding parts 211, 221 221 is a region where the average speed of washing water is large (radially outward) and a small region by gradually decreasing the size of the projections 211, 221 from the radially inner side toward the radially outer side. It is possible to make the Reynolds number on the surface of the stirring blade 200 (in the radial direction) constant. Thereby, since the effect | action with respect to the stirring blade 200 of washing water becomes equal, the water flow up effect of the stirring blade 200 surface is obtained equally.

  The plurality of protrusions may have the same size by gradually decreasing the distance between adjacent protrusions from the radially inner side to the radially outer side. In addition, the plurality of protrusions may be formed such that the size of the protrusions gradually decreases from the radially inner side to the radially outer side so that the intervals between the adjacent protrusions are equal.

  Further, in the washing machine that stirs the washing water by rotating the stirring blade 200 forward and backward, when the counterclockwise direction when viewed from above is the forward rotation direction, only the front edge side of the blade portions 210 and 220 in the forward rotation direction is provided. A plurality of protrusions 211 and 221 are provided. This enhances the flow of washing water in the forward rotation direction, while the flow of washing water is not enhanced in the reverse rotation direction, so that it is possible to create different water flows depending on the rotation direction, forming a more complex water flow it can. Such complicated water flow makes it easy to dissolve detergents and improve the cleaning power.

  Note that a stirring blade portion such as a screw that rotates together with the stirring blade 200 may be provided in the central portion of the stirring blade 200 (the stirring blade body). A vertical water flow is generated by the stirring blade portion. Accordingly, it is possible to generate a water flow that blows out from the center side of the stirring blade, and it is possible to further strengthen the water flow strengthened by the plurality of protrusions provided on the blade portion. In this case, a lid is provided to cover the stirring blade so as to prevent the laundry from being brought into contact with the stirring blade, and the stirring blade has a plurality of blades that apply shearing force to water, and the lid includes a plurality of lids. Through-holes.

  Further, an opening may be provided at the center of the stirring blade 200. Since the air is sucked in from the lower side of the stirring blade through this opening, the blowout water flow at the center can be strengthened by the water flow strengthened by the vertical vortex generated at the plurality of protrusions of the blade portion. If a plurality of protrusions are provided on both sides of the blade portion, the suction flow in the central portion that occurs at the time of reversal is further strengthened, which may make it difficult to blow out. When it is desired to strengthen only the blowout water flow at the center, it is preferable to provide a plurality of protrusions that function only when blowing out.

  Furthermore, it is possible to prevent the laundry from being damaged by the screw by attaching a cap-shaped protective cover having a plurality of through-holes so as to cover the screw housing portion that houses the screw. By providing a plurality of protrusions on the protective cover, it is possible to obtain an effect of scrubbing the laundry (that is, an effect of scrubbing the laundry with the plurality of protrusions).

[Modification of Second Embodiment]
FIG. 9 is a perspective view showing a modification of the stirring blade 200 of the second embodiment.

  9 is different from the stirring blade 200 of the second embodiment shown in FIG. 8 in that a through hole 240 is provided in the central portion, and the same reference numerals are used for the same components as in FIG. Is attached.

  In FIG. 9, when the stirring blade 200 rotates counterclockwise, the water flow f <b> 11 from the recess 202 collides with the plurality of protrusions 211 of the blade part 210, and a vertical vortex is formed downstream from each protrusion 211. (The same applies to the plurality of protrusions 221 of the blade portion 220). This vertical vortex generates lift for the downstream water flow f12. The lift with respect to the water flow is a force that suppresses the water flow f12 on the upper side of the blade portion 110 so as not to separate on the downstream side.

  As a result, the water flow in the circumferential direction is strengthened, so that an outward water flow f13 is generated from the central portion of the stirring blade 200. Therefore, the blowout water flow f14 is strengthened from the through hole 240 in the central portion of the stirring blade 200.

  Thereby, the water flow in the stirring tank 30 can be strengthened with a simple configuration, and the laundry on the flow in the washing water can be stirred more strongly.

[Third Embodiment]
FIG. 10 shows a perspective view of a stirring blade 300 according to the third embodiment of the present invention. The stirring blade 300 is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment.

  As shown in FIG. 10, the stirring blade 300 of the third embodiment has a disk shape with a diameter of 400 mm, and the surface of the stirring blade 300 is formed in a basin shape that becomes deeper toward the center with respect to the peripheral portion 300a. Has been. On the surface of the stirring blade 300, two blade portions 301 and 301 that are radially arranged with a central angle of 180 ° are formed to protrude. The two blade portions 301 and 301 are raised portions. In addition, you may set the diameter of the stirring blade 300 suitably according to the structure of a washing machine, etc.

  The two blade portions 301 and 301 are formed in the same shape, and the stirring blade 300 is formed in a rotationally symmetrical shape that is two-fold symmetric. The stirring blade 300 may be formed three-fold symmetrically or four-fold symmetrically. In the blade portion 301, the upper ends of the first side wall 301a and the second side wall 301b facing each other in the rotation direction are connected by an upper wall 301c having a substantially planar shape. Both side edges of the upper wall 301c are formed to be curved so that the outer periphery is inclined toward the first side wall 301a with respect to the center line of the stirring blade 300 when viewed from above.

  In addition, a curved bottom surface 302 whose center is lowered between adjacent blade portions 301 is provided, and the lower end of the first side wall 301 a and the lower end of the second side wall 301 b are connected by the bottom surface portion 302. The agitation blade 300 rotates during washing, and a water flow of washing water is generated in the agitation tank 30 (shown in FIG. 1) by the blade portion 301. The bottom surface portion 302 is an example of a concave portion.

  A large number of small holes 304 that penetrate the stirring blade 300 are provided in the bottom surface portion 302. The small hole 304 is also provided in the blade portion 301. The small hole 304 generates a water flow that is sucked into the space behind the stirring blade 300 that becomes negative pressure when the stirring blade 300 rotates.

  A plurality of hump-like protrusions 311 are provided so as to be aligned with the ridgeline RL1 extending in the radial direction of the two blade portions 301.

  The plurality of projecting portions 311 of the blade portion 301 gradually project from the radially inner side to the radially outer side, and the interval between the projecting portions 311 adjacent to each other gradually decreases and projects from the radially inner side to the radially outer side. The size of the portion 311 is gradually reduced. This makes it possible to make the Reynolds number on the surface of the stirring blade 300 constant in a region where the average speed of washing water is large (radially outer side) and a small region (radially inner side). For this reason, since the effect | action with respect to the stirring blade 300 of washing water becomes equal, the water flow up effect of the stirring blade 300 surface is obtained equally.

  By providing the plurality of protrusions 311 so as to be aligned with the ridgeline RL1 extending in the radial direction of the blade 301 (the bulging portion), a vertical vortex is formed downstream from each protrusion 311. On the other hand, lift is generated. The lifting force with respect to the washing water is a force for restraining the washing water flowing on the upper side of the blade portion 301 from being separated on the downstream side. Thereby, by strengthening the flow of washing water with a simple configuration, it is possible to more strongly agitate the laundry that rides the flow of washing water.

  In the agitating blade 300, the height gradually decreases from one of the two blade portions 301 (the raised portion) to the rotation center, reaches the bottom surface portion 302 (concave portion), and gradually increases while further rotating. The height increases to the other blade portion 301.

  Note that the ridge line RL1 of the blade portion 301 where the plurality of protrusions 311 are formed is represented by a curve connecting the maximum height positions in the circumferential direction.

  According to the stirring blade 300 configured as described above, when the stirring blade 300 rotates, the water flow from the bottom surface portion 302 collides with the plurality of protrusions 311 of the blade portion 301, and a vertical vortex is formed downstream from each protrusion 311. Is done. This vertical vortex generates lift for the downstream water flow. This lift suppresses the water flow passing over the upper side of the blade portion 110 from being separated on the downstream side, and strengthens the water flow in the circumferential direction.

  Thereby, the water flow in the stirring tank 30 can be strengthened with a simple configuration, and the laundry on the flow in the washing water can be stirred more strongly.

  The stirring blade 300 and the stirring tank 30 constitute a stirring device.

  In addition, you may provide stirring blade parts, such as a screw which rotates integrally with the stirring blade 300 in the center part of the stirring blade 300 (stirring blade main body). A vertical water flow is generated by the stirring blade portion. Accordingly, it is possible to generate a water flow that blows out from the center side of the stirring blade, and it is possible to further strengthen the water flow strengthened by the plurality of protrusions provided on the blade portion. In this case, a lid is provided to cover the stirring blade so as to prevent the laundry from being brought into contact with the stirring blade, and the stirring blade has a plurality of blades that apply shearing force to water, and the lid includes a plurality of lids. Through-holes.

  Further, an opening may be provided in the center of the stirring blade 300. Since the air is sucked in from the lower side of the stirring blade through this opening, the blowout water flow at the center can be strengthened by the water flow strengthened by the vertical vortex generated at the plurality of protrusions of the blade portion. If a plurality of protrusions are provided on both sides of the blade portion, the suction flow in the central portion that occurs at the time of reversal is further strengthened, which may make it difficult to blow out. When it is desired to strengthen only the blowout water flow at the center, it is preferable to provide a plurality of protrusions that function only when blowing out.

  Furthermore, it is possible to prevent the laundry from being damaged by the screw by attaching a cap-shaped protective cover having a plurality of through-holes so as to cover the screw housing portion that houses the screw. By providing a plurality of protrusions on the protective cover, it is possible to obtain an effect of scrubbing the laundry (that is, an effect of scrubbing the laundry with the plurality of protrusions).

[Fourth Embodiment]
FIG. 11 shows a perspective view of a stirring blade 400 according to the fourth embodiment of the present invention. The stirring blade 400 is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment, and uses FIG.

  As shown in FIG. 11, the stirring blade 400 according to the fourth embodiment has a disk shape with a diameter of 400 mm, and the surface of the stirring blade 400 is radially arranged at a central angle of 180 °. Two blade portions 401, 401 are formed to protrude. The two blade portions 401 and 401 are raised portions. The diameter of the stirring blade 400 may be set as appropriate according to the configuration of the washing machine.

  The two blade portions 401 and 401 are formed in the same shape, and the stirring blade 400 is formed in a rotationally symmetrical shape that is two-fold symmetric. The stirring blades 400 may be formed three times symmetrical or four times symmetrical.

  In addition, a bottom surface portion 402 is provided between adjacent blade portions 401. The bottom surface portion 402 is an example of a concave portion.

  A plurality of hump-like projections 411 are provided so as to be spaced along one of the circumferential directions with respect to the ridge line RL2 extending in the radial direction of the two blade parts 401 and 401 and along the ridge line RL2.

  The plurality of protrusions 411 of the blade portion 401 gradually narrows the interval between the adjacent protrusions 411 from the radially inner side to the radially outer side, and protrudes from the radially inner side to the radially outer side. The size of the portion 411 is gradually reduced. This makes it possible to make the Reynolds number of the surface of the stirring blade 400 constant in a region where the average speed of the washing water is large (radially outer side) and a small region (radially inner side). For this reason, since the effect | action with respect to the stirring blade 400 of washing water becomes equal, the water flow up effect of the stirring blade 400 surface is obtained equally.

  In the agitating blade 400, the height gradually decreases from one of the two blade portions 401 (protrusion portion) to the rotation center and reaches the bottom surface portion 402 (concave portion), and gradually increases while further circling. The height increases to the other blade portion 401.

  Note that the ridge line RL2 of the blade 401 where the plurality of protrusions 411 are formed is represented by a curve connecting the maximum height positions in the circumferential direction.

  The stirring blade 400 and the stirring tank 30 constitute a stirring device.

  According to the stirring blade 400 having the above-described configuration, by providing the plurality of protrusions 411 at locations where the water flows collide, a vertical vortex is formed from each protrusion 411 toward the downstream. This vertical vortex generates lift for the downstream water flow. This lift suppresses the water flow passing over the upper side of the blade portion 110 from being separated on the downstream side, and strengthens the water flow in the circumferential direction.

  Thereby, the water flow in the stirring tank 30 can be strengthened with a simple configuration, and the laundry on the flow in the washing water can be stirred more strongly.

  Furthermore, in the washing machine that stirs the washing water by rotating the stirring blade 400 forward and backward, when the counterclockwise direction when viewed from above is the forward rotation direction, only the front edge side of the blade portions 401 and 401 in the forward rotation direction. A plurality of protrusions 411 are provided. This enhances the flow of washing water in the forward rotation direction, while the flow of washing water is not enhanced in the reverse rotation direction, so that it is possible to create different water flows depending on the rotation direction, forming a more complex water flow it can. Such complicated water flow makes it easy to dissolve detergents and improve the cleaning power.

  In addition, a rotation that reverses forward and backward is provided by providing a plurality of protrusions 411 so as to be spaced along one of the circumferential directions and along the ridge line RL2 with respect to the ridge line RL2 extending in the radial direction of the blade portion 401 (protrusion portion). By doing this, a complex water flow can be formed.

  In addition, you may provide stirring blade parts, such as a screw which rotates integrally with the stirring blade 400 in the center part of the stirring blade 400 (stirring blade main body). A vertical water flow is generated by the stirring blade portion. Accordingly, it is possible to generate a water flow that blows out from the center side of the stirring blade, and it is possible to further strengthen the water flow strengthened by the plurality of protrusions provided on the blade portion. In this case, a lid is provided to cover the stirring blade so as to prevent the laundry from being brought into contact with the stirring blade, and the stirring blade has a plurality of blades that apply shearing force to water, and the lid includes a plurality of lids. Through-holes.

  Further, an opening may be provided at the center of the stirring blade 400. Since the air is sucked in from the lower side of the stirring blade through this opening, the blowout water flow at the center can be strengthened by the water flow strengthened by the vertical vortex generated at the plurality of protrusions of the blade portion. If a plurality of protrusions are provided on both sides of the blade portion, the suction flow in the central portion that occurs at the time of reversal is further strengthened, which may make it difficult to blow out. When it is desired to strengthen only the blowout water flow at the center, it is preferable to provide a plurality of protrusions that function only when blowing out.

  Furthermore, it is possible to prevent the laundry from being damaged by the screw by attaching a cap-shaped protective cover having a plurality of through-holes so as to cover the screw housing portion that houses the screw. By providing a plurality of protrusions on the protective cover, it is possible to obtain an effect of scrubbing the laundry (that is, an effect of scrubbing the laundry with the plurality of protrusions).

[Fifth Embodiment]
FIG. 12 shows an exploded perspective view of a stirring blade 500 according to the fifth embodiment of the present invention. The stirring blade 500 is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment, and uses FIG.

  As shown in FIG. 12, the stirring blade 500 includes a disc-shaped stirring blade body 501 having a diameter of 400 mm. The stirring blade body 501 is formed in a tray shape that becomes deeper toward the center with respect to the peripheral edge portion 501a. On the surface of the stirring blade main body 501, blade portions 510 and blade portions 520 arranged radially at a central angle of 90 ° are formed so as to protrude. The blade portions 510 and the blade portions 520 are alternately arranged in the circumferential direction. Further, four concave portions 502 that are adjacent to the blade portions 510 and 520 in the circumferential direction are provided. The diameter of the stirring blade 500 may be set as appropriate according to the configuration of the washing machine.

  The two blade portions 510 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the middle between the inner periphery and the outer periphery in the radial direction is the highest and swells upward. On the other hand, the two blade portions 520 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the outer peripheral side is the highest and bulges upward.

  The blade portions 510 and 520 are arranged on one surface of the stirring blade body 501 and project in the axial direction.

  In addition, a plurality of hump-like protrusions 511 are provided on the front edge side of the blade portion 510 (when the counterclockwise rotation is positive rotation) so as to be arranged at equal intervals in the radial direction. In the plurality of protrusions 511 of the blade portion 510, the interval between the adjacent protrusions 511 is gradually narrowed from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protrusion 511 is gradually reduced.

  In addition, a plurality of hump-like protrusions 521 are provided on the front edge side of the blade portion 520 (when the counterclockwise rotation is a positive rotation) so as to be arranged at intervals in the radial direction. In the plurality of protrusions 521 of the blade portion 520, the interval between the adjacent protrusions 521 gradually decreases from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protrusion 521 is gradually reduced.

  This makes it possible to make the Reynolds number of the surface of the agitating blade body 501 constant in a region where the average speed of washing water is large (radially outer side) and a small region (radially inner side). Thereby, since the effect | action with respect to the stirring blade main body 501 of wash water becomes equal, the water flow up effect of the stirring blade 500 surface is obtained equally.

  A plurality of ribs 503 a are provided on the surfaces of the blade portions 510 and 520 of the stirring blade body 501, and a plurality of ribs 503 b are provided on the surface of the recess 502 of the stirring blade 500.

  A large number of small holes 504 penetrating the stirring blade main body 501 are provided between the adjacent ribs 503a and between the ribs 503b. The small holes 504 are also provided in the blade portions 510 and 520. The small hole 504 generates a water flow that is sucked into the space on the back side of the stirring blade body 501 that becomes negative pressure when the stirring blade 500 rotates.

  Further, a screw storage portion 540 having a diameter of 100 mm is provided at the central portion of the stirring blade body 501. A shaft portion 550 is erected at the center of the screw storage portion 540.

  Further, the stirring blade 500 includes a screw 600 attached to the shaft portion 550 of the stirring blade body 501 and a cap-shaped protective cover 700 attached so as to cover the screw storage portion 540 that houses the screw 600. The screw 600 is an example of a stirring blade part. The protective cover 700 is an example of a lid, and is made of a transparent resin so that the inner screw 600 can be visually observed.

  FIG. 13 shows a perspective view of the screw 600 of the stirring blade 500 as viewed obliquely from above, and FIG. 14 shows a perspective view of the screw 600 of the stirring blade 500 as viewed from obliquely below.

  As shown in FIGS. 13 and 14, the screw 600 includes a cylindrical portion 601 having a shaft hole 601 a and four blades 602 provided on the side surface of the cylindrical portion 601 at equal intervals in the circumferential direction.

  The front edge 602a of the screw 600 has a wave shape when rotating counterclockwise when viewed from above. The wave-shaped leading edge 602a has a gradually decreasing pitch between adjacent waves from the radially inner side to the radially outer side, and the wave magnitude increases from the radially inner side to the radially outer side. Is gradually getting smaller.

  According to the screw 600, the Reynolds number on the surface of the blade 602 can be made constant in a region where the average fluid velocity is large (outside in the radial direction) and a small region (inside in the radial direction). Thereby, since the effect | action with respect to the screw 600 of a water flow becomes equal, the effect of the reciprocating water flow of an up-down direction is also obtained equally.

  The shaft portion 550 (shown in FIG. 12) of the stirring blade body 501 is inserted into the shaft hole 601a of the cylindrical portion 601 of the screw 600. At this time, the keys 550a and 550a of the shaft portion 550 (shown in FIG. 12) are fitted into the key grooves 601b and 601b provided in the cylindrical portion 601 of the screw 600.

  Further, as shown in FIG. 14, the radius R of the edge EG1 of the plurality of blades 602 of the screw 600 (stirring blade portion) is set to 2 mm or less, and the diameter of the screw 600 is 1 of the diameter (400 mm) of the stirring blade body 501. / 2 or less (in this fifth embodiment, 100 mm), in the screw 600 covered with the protective cover 700 (lid body), the plurality of blades 602 do not come into contact with the laundry. A stronger water flow can be generated by a plurality of blades 602 of 2 mm or less. Here, the edges EG1 of the plurality of blades 602 are the corners of the front edge and the rear edge of each blade 602.

  The screw 600 has a function of easily dissolving powder detergent and laundry soap and a function of increasing stirring ability by up and down water flow. The larger the screw 600, the easier the powder detergent and laundry soap is dissolved. If the capacity exceeds 1/2 of the diameter (400 mm) of the stirring blade body 501, the cleaning power of the stirring blade body 501 is reduced. Is desirable.

  Further, since the screw 600 (stirring blade portion) is covered with the protective cover 700 (lid body), the width W1 (shown in FIG. 14) of the plurality of blades 602 can be reduced to 10 mm or less, and is lighter. It becomes easy to move and can generate a strong shear force while keeping the force required for rotation small. Here, the width W 1 of the plurality of blades 602 is the thickness of each blade 602.

  FIG. 15 is a perspective view of the protective cover 700 of the stirring blade 500 as viewed obliquely from above. As shown in FIG. 15, the protective cover 700 includes a dome portion 701, a cylindrical portion 702 that extends downward from the lower edge of the dome portion 701, and four legs 703 that extend downward from the lower end of the cylindrical portion 702. . An engaging claw 703 a is provided at the lower end of the leg portion 703.

  A plurality of hump-like first protrusions 710 and a plurality of hump-like second protrusions 720 smaller than the first protrusions 710 are provided on the surface of the dome 701. In addition, a plurality of small holes 704 are provided in a region excluding the first and second projecting portions 710 and 720 of the dome portion 701. The plurality of small holes 704 is an example of a through hole.

  By providing a plurality of first and second protrusions 710 and 720 on the surface of the protective cover 700, in the washing machine using the stirring blade 500, the effect of washing the laundry with squeeze (that is, the plurality of protrusions 710 and 720). (Effect of scrubbing laundry). Further, by providing a plurality of small holes 704 in a region excluding the plurality of first and second protrusions 710 and 720 of the protective cover 700, the vertical reciprocating water flow generated by the screw 600 is not hindered by the protective cover 700. .

  A stirring blade 500 shown in FIG. 16 is a top view in a state where the screw 600 and the protective cover 700 are attached. In FIG. 16, the same reference numerals are assigned to the same components as those in FIG.

  FIG. 17 is a longitudinal sectional view taken along line XVII-XVII in FIG. In FIG. 17, the same components as those in FIG. 12 are denoted by the same reference numerals.

  FIG. 18 is a perspective view of the stirring blade 500 with the screw 600 and the protective cover 700 attached thereto. In FIG. 18, the same components as those in FIG. 12 are denoted by the same reference numerals.

  As shown in FIG. 18, the agitating blade main body that comes into contact with clothing by setting the radius R of the edge EG2 of the blade portions 510 and 520 of the stirring blade main body 501 to 2 mm or more and the diameter of the stirring blade main body 501 to 400 mm. While increasing the stirring force of 501, the cloth can be prevented from being caught and damaged by the blade portions 510 and 520. Here, the edges EG2 of the blade portions 510 and 520 are corner portions on the front edge side and the rear edge side in the circumferential direction of the blade portions 510 and 520, respectively.

  Further, the stirring blade body 501 that comes in contact with the clothes is damaged if the blades 510 and 520 are sharply thinned and provided in order to increase the stirring force. Therefore, the blades 510 of the stirring blade body 501 are damaged. , 520 width W2 (shown in FIG. 18) is preferably set to 10 mm or more. Here, the width W2 of the blade portions 510 and 520 of the stirring blade body 501 is the length of each blade portion 510 and 520 in the circumferential direction.

  Further, by arranging the protective cover 700 (lid) so as to be at least partially connected to the extended line of the ridge line extending in the radial direction of the blade portions 510 and 520 of the stirring blade body 501, the laundry is protected. The cover 700 is not easily caught and the flow near the boundary between the blade portions 510 and 520 of the stirring blade main body 501 and the protective cover 700 becomes smooth, whereby the water flow can be strengthened.

  FIG. 19 shows a top view of the stirring blade 500 with the protective cover 700 removed. 19, the same components as those in FIG. 12 are denoted by the same reference numerals.

  20 shows a side view of the stirring blade 500 shown in FIG. 19 as viewed from the right side. In FIG. 22, the same components as those in FIGS. 12 to 19 are denoted by the same reference numerals.

  As shown in FIG. 20, a thin plate-like blade portion 518 extending in the radial direction is erected in a groove portion 517 on the back side of the blade portion 510.

  FIG. 21 shows a back view of the stirring blade 500. As shown in FIG. 21, a boss portion 530 having a shaft hole 506 is erected at the center of the lower surface of the stirring blade 500. The tip of the stirring blade shaft 45 is fixed to the shaft hole 506 of the boss portion 530. Further, a thin plate-like blade portion 518 extending in the radial direction is provided upright in a groove portion 517 on the back side of the blade portion 510 (shown in FIG. 19). Further, a thin plate-like blade portion 528 extending in the radial direction is provided upright in a groove portion 527 on the back side of the blade portion 520 (shown in FIG. 19).

  The blade portion 510 and the groove portion 517 are in an integrated relationship. Further, the blade portion 520 and the groove portion 527 are in an integrated relationship. Open ends 517a and 527a on the outer peripheral side of the grooves 517 and 527 face the peripheral wall 30b (shown in FIG. 1) of the stirring tank 30.

  The blade portions 518 and 528 extend from the inner end close to the center of the stirring blade 500 in the horizontal direction at a constant height in the radial direction, and gradually increase in height on the outer peripheral side with respect to the inner peripheral side toward the outer end. It is formed to be low. The blade portions 518 and 528 having such a shape are suitable for scraping water in the radial direction. Therefore, the rotation of the stirring blade 500 causes the blade portions 518 and 528 to scratch the washing water between the stirring blade 500 and the peripheral wall 30b of the stirring tank 30 and to generate a strong water flow radially outward along the groove portions 517 and 527. generate.

  The stirring blade 500 and the stirring tank 30 constitute a stirring device.

  FIG. 22 shows a top view of the stirring blade 500 with the protective cover 700 and the screw 600 removed. In FIG. 22, the same components as those in FIGS. 12 to 19 are denoted by the same reference numerals.

  As shown in FIG. 22, a plurality of openings 540 a are provided in the screw storage portion 540 in the central portion of the stirring blade 500. The opening 540a has a plurality of fan-shaped openings. The opening 540a forms a flow path in which the washing water flows in the vertical direction between the back surface side and the top surface side of the central portion of the stirring blade 500.

  Next, the water flow of the stirring blade 500 will be described with reference to FIGS.

  FIG. 23 shows a water flow when the stirring blade 500 is rotated clockwise as viewed from above, and FIG. 24 shows a water flow when the stirring blade 500 is rotated counterclockwise when viewed from above. The same components as those in FIGS. 12 to 19 are denoted by the same reference numerals. Further, in FIGS. 23 and 24, the protective cover 700 is omitted for easy understanding of the drawings.

  According to the stirring blade 500 configured as described above, as shown in FIG. 23, the screw 600 at the center of the stirring blade 500 rotates integrally with the stirring blade 500 by rotating the stirring blade 500 clockwise as viewed from above. .

  At this time, since the space behind the stirring blade 500 is in a negative pressure state after the washing water is pushed out, new washing water flows from the plurality of small holes 504 near the center of the stirring blade 500. In the vicinity of the center of rotation above the stirring blade 500, a water flow descending downward is generated. Accordingly, the washing water continuously circulates in the agitation tank 30 by the water flow descending on the center side and the water flow rising on the outer peripheral side.

  By the clockwise rotation (reverse rotation) of the screw 600, the washing water is sucked in the central portion of the stirring blade 500 and flows into the lower side of the stirring blade 500 through the opening 540a (shown in FIG. 22). Water flows in the radial direction from the inner peripheral side to the outer peripheral side of the groove portions 517 and 527 (shown in FIG. 21) by centrifugal force. At this time, the thin plate-like blade portion 518 of the groove portion 517 and the thin plate-like blade portion 528 of the groove portion 527 function like oar so that water is scraped out to the outside, and the peripheral wall 30b of the stirring tank 30 (FIG. 21). A strong water flow is formed toward

  And the water which flowed out from the groove part 517,527 of the stirring blade 500 passes along the clearance gap between the stirring blade 500 and the surrounding wall 30b, and rises along the surrounding wall 30b.

  On the other hand, as shown in FIG. 24, by rotating the stirring blade 500 counterclockwise when viewed from above, the screw 600 at the center of the stirring blade 500 rotates together with the stirring blade 500.

  By the counterclockwise rotation (forward rotation) of the screw 600, the washing water is blown out from the lower side of the central portion of the stirring blade 500 through the opening 540a (shown in FIG. 22). At this time, water flows in the radial direction from the inner peripheral side to the outer peripheral side of the groove portions 517 and 527 by centrifugal force. At this time, the thin plate-like blade portion 518 of the groove portion 517 and the thin plate-like blade portion 528 of the groove portion 527 function like oar, and water is scraped outward, toward the peripheral wall 30 b of the stirring tank 30. A strong water flow is formed.

  And the water which flowed out from the groove part 517,527 of the stirring blade 500 passes the clearance gap between the stirring blade 500 and the surrounding wall 30b, and rises to the upper part of the stirring tank 30 along the surrounding wall 30b.

  At this time, in both the forward rotation and the reverse rotation of the stirring blade 500, a wave that vibrates up and down is generated on the water surface of the stirring tank 30, and a raised portion corresponding to the number of grooves is formed.

  According to the agitating blade 500, the reciprocating water flow (suction water flow / blow-off water flow) can be generated in the central portion of the stirring tank 30 by the rotation of the screw 600. In particular, the stirring force is greatly increased by the generation of a blown water flow that could not be generated by the conventional stirring blades.

  Further, by providing the stirring blade 500 with the opening 540a, as shown in FIG. 24, the opening 540a is made of water flow reinforced by the plurality of protrusions 511 of the blade part 510 and the plurality of protrusions 521 of the blade part 120. Can further strengthen the water flow.

  According to the stirring blade 500 of the fifth embodiment, the plurality of protrusions 511 are arranged on the front edge side of the blade portions 510 and 520 where the washing water collides with the rotation of the stirring blade 500 itself so as to be arranged at intervals in the radial direction. , 521 is provided to form a vertical vortex downstream from each projection 511, 521. This vertical vortex generates lift for the washing water. By the lifting force with respect to the washing water, the washing water flowing on the upper side of the blade portions 510 and 520 is suppressed so as not to be separated on the downstream side. Thereby, by strengthening the flow of washing water with a simple configuration, it is possible to more strongly agitate the laundry that rides the flow of washing water.

  Further, in a washing machine that stirs washing water by rotating the stirring blade 500 forward and backward, when the counterclockwise direction when viewed from above is set as the forward rotation direction, only the front edge side of the blade portions 510 and 520 in the forward rotation direction is provided. A plurality of protrusions 511 and 521 are provided. This enhances the flow of washing water in the forward rotation direction, while the flow of washing water is not enhanced in the reverse rotation direction, so that it is possible to create different water flows depending on the rotation direction, forming a more complex water flow it can. In particular, in a washing machine using a stirring blade, the detergent can be easily dissolved by such a complicated water flow, and the cleaning power can be improved.

  Further, the screw 600 (stirring blade portion) provided at the central portion of the stirring blade body 501 rotates integrally with the stirring blade body 501, thereby generating a water flow in the vertical direction. Accordingly, it is possible to generate a water flow that blows out from the center side of the stirring blade 500, and it is possible to further strengthen the water flow strengthened by the plurality of protrusions 511 and 521 provided on the blade portions 510 and 520. In addition, the stirring force is greatly increased by the generation of a blown water flow from the central portion that could not be generated by the conventional stirring blades. Particularly in a washing machine, by generating such a reciprocating water flow in the vertical direction, the stirring force can be strengthened, the detergent and the like can be easily dissolved, and the cleaning power can be improved.

  Furthermore, there is an opening 540a in the center of the stirring blade body 501, and since the suction is performed from the lower side of the stirring blade body 501, the water flow enhanced by the vertical vortices generated at the plurality of protrusions 511 and 521 of the blade portions 510 and 520 Thereby, the blowing water flow at the center can be strengthened. The opening 540a of the stirring blade body 501 is provided in a region where the radius from the center of the stirring blade body 501 is ¼ of the outer radius of the stirring blade body 501, but is ½ of the outer radius of the stirring blade body 501. It is only necessary to provide it in a region less than this, and thereby it is possible to generate the necessary reciprocating water flow in the vertical direction while maintaining the stirring force by the blade portion.

  If a plurality of protrusions are provided on both sides of the blades 510 and 520, the suction flow in the central part that occurs at the time of reversal is further strengthened, which may make it difficult to blow out. When it is desired to strengthen only the blowout water flow at the center, it is preferable to provide a plurality of protrusions that function only when blowing out.

  Further, by providing the cap-shaped protective cover 700 with a plurality of protrusions 710 and 720, an effect of washing the laundry with squeeze (that is, an effect of scrubbing the laundry with the plurality of protrusions 710 and 720) can be obtained.

  With conventional stirring blades, for example, powder detergent and laundry soap are difficult to dissolve, and if powder detergent and laundry soap remain undissolved, the concentration of the detergent contained in the wash water will be reduced and the cleaning power will be weakened. There is a problem that bacteria accumulate on the wall and bottom of the wing and the washing machine, and germs such as black mold propagate there, and the stirring wing and the washing machine are contaminated.

  On the other hand, according to the stirring blade 500 of the fifth embodiment, as shown in FIG. 13, in front of the blade 602 of the screw 600 (stirring blade portion) in the counterclockwise direction (left rotation) when viewed from above. Longitudinal vortices are generated from the front ends of a plurality of wavy shapes of the edge 602a, and the vertical vortices generated by the blades 602 collide with each other, so that the detergent powder can be efficiently stirred and dissolved, and the cleaning effect can be enhanced. .

  Moreover, powder detergent, laundry soap, etc. can be rapidly dissolved in water by the stirring blade 500 arrange | positioned in the stirring tank 30 rotating. As a result, the growth of black mold and other germs can be suppressed, and the cleaning power can be improved by increasing the concentration of the detergent contained in the washing water, and the mechanical force transmitted to the clothing by the reciprocating water flow in the vertical direction can be increased. The washing ability can be greatly improved.

  According to the stirring blade 500 for a washing machine having the above-described configuration, when water and laundry are stirred by the blade portions 510 and 520 of the rotating stirring blade body 501, the screw 600 ( The agitating blade part) rotates integrally with the agitating blade body 501 and the plurality of blades 602 of the screw 600 give a shearing force to the water. As a result, a complicated flow in which the flow in the rotational direction generated by the stirring blade body 501 and the flow in the shear direction generated by the screw 600 are mixed to increase the stirring force, so that powder detergent, laundry soap, and the like are efficiently dissolved. be able to. At this time, the cover 700 covers the plurality of blades 602 of the screw 600, thereby preventing the laundry from contacting the screw 600. Therefore, with a simple configuration, powder detergent, laundry soap, and the like can be quickly dissolved while suppressing damage to clothing. Further, by preventing undissolved residue of powder detergent or laundry soap, it is possible to suppress the growth of black mold and various germs, and it is possible to improve the cleaning power by increasing the concentration of the detergent contained in the cleaning liquid.

  In the fifth embodiment, the stirring blade body 501 and the protective cover 700 (lid body) are separate members. However, the stirring blade body and the lid body may be integrally formed. In this case, the structure of the stirring blade can be simplified and the cost can be reduced.

[Sixth Embodiment]
FIG. 25 shows a top view of a stirring blade 800 according to the sixth embodiment of the present invention. The stirring blade 800 of the sixth embodiment has the same configuration as the stirring blade 500 of the fifth embodiment except for the screw 900, and is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment. FIG. 1 is incorporated.

  As shown in FIG. 25, the stirring blade 800 has a disc-shaped stirring blade body 801 having a diameter of 400 mm. The stirring blade body 801 is formed in a tray shape that becomes deeper toward the center with respect to the peripheral edge 801a. On the surface of the stirring blade main body 801, blade portions 810 and blade portions 820 that are radially arranged alternately in the circumferential direction at a central angle of 90 ° are formed to protrude. Further, four concave portions 802 that are adjacent to the blade portions 810 and 820 in the circumferential direction are provided. The diameter of the stirring blade body 801 may be set as appropriate according to the configuration of the washing machine.

  The two blade portions 810 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the middle between the inner periphery and the outer periphery in the radial direction is the highest and swells upward. On the other hand, the two blade portions 820 are point-symmetric with respect to the center of rotation and have a shape in which the vicinity of the outer peripheral side is the highest and bulges upward.

  The blade portions 810 and 820 are arranged on one surface of the stirring blade body 801 and protrude in the axial direction.

  In addition, a plurality of hump-shaped protrusions 811 are provided on the front edge side of the blade portion 810 (when the counterclockwise rotation is a positive rotation) so as to be arranged at equal intervals in the radial direction. In the plurality of protrusions 811 of the blade 810, the interval between the adjacent protrusions 811 gradually decreases from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protrusion 811 is gradually reduced.

  In addition, a plurality of hump-like protrusions 821 are provided on the front edge side of the blade portion 820 (when the counterclockwise rotation is a positive rotation) so as to be arranged at intervals in the radial direction. In the plurality of protrusions 821 of the blade 820, the interval between the adjacent protrusions 821 is gradually narrowed from the radially inner side to the radially outer side, and from the radially inner side to the radially outer side. Thus, the size of the protrusion 821 is gradually reduced.

  A plurality of ribs 803 a are provided on the surfaces of the blade portions 810 and 820 of the stirring blade main body 801, and a plurality of ribs 803 b are provided on the surface of the concave portion 802 of the stirring blade 800.

  A large number of small holes 804 penetrating the stirring blade body 801 are provided between the adjacent ribs 803a and between the ribs 803b. The small holes 804 are also provided in the blade portions 810 and 820. The small hole 804 generates a water flow that is sucked into the space behind the stirring blade body 801 that becomes negative pressure when the stirring blade 800 rotates.

  Further, a screw storage portion 840 is provided at the central portion of the stirring blade body 801. A shaft portion 850 is erected at the center of the screw storage portion 840.

  The stirring blade 800 includes a screw 900 attached to the shaft portion 850 and a cap-shaped protective cover 1000 (shown in FIG. 27) attached so as to cover the screw storage portion 840 that houses the screw 900. . The screw 900 is an example of a stirring blade part. The protective cover 1000 is an example of a lid.

  The stirring blade 800 of the sixth embodiment has the same configuration as the stirring blade 500 of the fifth embodiment except for the screw 900, and has the same effect as the stirring blade 500 of the fifth embodiment.

  FIG. 26 shows a perspective view of the screw 900 of the stirring blade 800 as viewed obliquely from above. As shown in FIG. 26, the screw 900 has a cylindrical portion 901 having a shaft hole 901a and eight blades 902 provided on the side surface of the cylindrical portion 901 at equal intervals in the circumferential direction.

  The front edge 902a of the screw 900 has a wave shape when rotating counterclockwise when viewed from above. The wave-shaped leading edge 902a has a gradually decreasing pitch between adjacent waves from the radially inner side to the radially outer side, and the wave magnitude from the radially inner side to the radially outer side. Is gradually getting smaller.

  Further, the rear edge 902b of the screw 900 has a wave shape when rotating counterclockwise when viewed from above. The wave-shaped rear edge 902b has a gradually decreasing pitch between adjacent waves from the radially inner side to the radially outer side, and the wave magnitude from the radially inner side to the radially outer side. Is gradually getting smaller.

  According to the screw 900, the Reynolds number on the surface of the blade 902 can be made constant in a region where the average fluid velocity is large (outside in the radial direction) and a small region (inside in the radial direction). Thereby, since the effect | action with respect to the screw 900 of a water flow becomes equal, the effect of the reciprocating water flow of an up-down direction is also obtained equally.

  A shaft portion 850 (shown in FIG. 25) is inserted into the shaft hole 901a of the cylindrical portion 901 of the screw 900. At this time, a key (not shown) of the shaft portion 850 is fitted into two key grooves 901b provided in the cylindrical portion 901 of the screw 900.

  FIG. 27 shows a side view of the main part including the screw 900. In FIG. 27, reference numeral 1000 denotes a protective cover. As shown in FIG. 27, when rotating counterclockwise when viewed from above, a water flow is generated from the lower side toward the upper side.

  FIG. 28 is a schematic diagram showing a longitudinal vortex generated by the blade 902 of the screw 900. FIG. In FIG. 28 (a), a vertical vortex is generated from a plurality of wavy tip ends of the front edge 902a of the blade 902 in the counterclockwise direction (left rotation) as viewed from above. And since the vertical vortex which generate | occur | produced in each braid | blade 902 collides, detergent powder can be efficiently stirred and melt | dissolved and the cleaning effect can be improved.

  On the other hand, in FIG. 28B, when viewed from above (clockwise), the trailing edge 902b of the blade 902 becomes the leading edge, and vertical vortices are generated from the plurality of corrugated tips. . And since the vertical vortex which generate | occur | produced in each braid | blade 902 collides, detergent powder can be efficiently stirred and melt | dissolved and the cleaning effect can be improved.

  Moreover, since the peeling from the blade 902 is suppressed by the vertical vortex generated by the blade 902 of the screw 900, the inclination of the blade 902 can be increased, and the water flow in the vertical direction can be further strengthened.

[Seventh Embodiment]
FIG. 29 shows a top view of a stirring blade 1100 according to the seventh embodiment of the present invention. The stirring blade 1100 is used in a washing machine having the same configuration as the washing machine 1 of the first embodiment, and uses FIG.

  As shown in FIG. 29, the stirring blade 1100 of the seventh embodiment has a disc-shaped stirring blade body 1110 having a diameter of 400 mm. The stirring blade body 1110 is formed in a tray shape that becomes deeper toward the center with respect to the peripheral edge portion 1110a. On the surface of the stirring blade body 1110, two blade portions 1101 that are radially arranged at a central angle of 180 ° are formed to protrude. The two blade portions 1101 are raised portions. The diameter of the stirring blade body 1110 may be set as appropriate according to the configuration of the washing machine.

  The two blade portions 1101 and 1101 are formed in the same shape, and the stirring blade 1100 is formed in two-fold rotational symmetry. The stirring blade 1100 may be formed with three-fold symmetry or four-fold symmetry. The upper end of the first side wall 1101a and the second side wall 1101b facing each other in the rotation direction is connected to the blade portion 1101 by an upper wall 1101c having a substantially planar shape. Both side edges of the upper wall 1101c are formed to be curved so that the outer circumference is inclined toward the first side wall 1101a with respect to the center line of the stirring blade 1100 when viewed from above.

  In addition, a curved bottom surface portion 1102 whose center is lowered is provided between adjacent blade portions 1101, and the lower end of the first side wall 1101 a and the lower end of the second side wall 1101 b are connected by the bottom surface portion 1102. The agitation blade 1100 rotates during washing, and a water flow of washing water is generated in the agitation tank 30 (shown in FIG. 1) by the blade part 1101. The bottom surface portion 1102 is an example of a concave portion.

  The stirring blade 1100 and the stirring tank 30 constitute a stirring device.

  In the agitating blade 1100, the height gradually decreases from one of the two blade portions 1101 (the raised portion) to the rotation center, reaches the bottom surface portion 1102 (concave portion), and gradually turns while further circling. The height increases to the other blade portion 1101.

  Further, a screw storage portion 1140 having a diameter of 160 mm is provided at the central portion of the stirring blade body 1110. A shaft portion 1150 is erected at the center of the screw storage portion 1140. Further, the screw storage portion 1140 is provided with a plurality of openings 1140a. The opening 1140a has a plurality of fan-shaped openings. The opening 1140a forms a flow path in which the washing water flows in the vertical direction between the back surface side and the top surface side of the central portion of the stirring blade 1100.

  The opening 1140a of the stirring blade body 1110 is provided in a region where the radius from the center of the stirring blade body 1110 is 2/5 of the outer radius of the stirring blade body 1110. It is only necessary to provide it in a region less than this, and thereby it is possible to generate the necessary reciprocating water flow in the vertical direction while maintaining the stirring force by the blade portion.

  The stirring blade 1100 includes a screw 1200 attached to the shaft portion 1150 and a cap-shaped protective cover (not shown) attached so as to cover the screw storage portion 1140 that accommodates the screw 1200. This screw 1200 is an example of a stirring blade part.

  The screw 1200 has the same configuration as the screw 600 of the fifth embodiment. The protective cover has the same configuration as the protective cover 700 of the fifth embodiment.

  According to the stirring blade 500 for a washing machine having the above-described configuration, when water and laundry are stirred by the blade portions 510 and 520 of the rotating stirring blade body 1110, the screw 1200 ( The agitating blade part) rotates together with the agitating blade body 1110 and the plurality of blades of the screw 1200 give shearing force to the water. As a result, a complicated flow in which the rotational flow generated by the stirring blade body 1110 and the shearing flow generated by the screw 1200 are mixed and the stirring force is increased, so that the powder detergent or laundry soap is efficiently dissolved. be able to. At this time, the plurality of blades of the screw 1200 are covered with a protective cover (lid body), thereby preventing the laundry and the screw 1200 from contacting each other. Therefore, with a simple configuration, powder detergent, laundry soap, and the like can be quickly dissolved while suppressing damage to clothing. Further, by preventing undissolved residue of powder detergent or laundry soap, it is possible to suppress the growth of black mold and various germs, and it is possible to improve the cleaning power by increasing the concentration of the detergent contained in the cleaning liquid.

  When the screw 1200 (stirring blade portion) provided at the central portion of the stirring blade 1100 rotates together with the stirring blade 1100, a water flow in the vertical direction is generated. Thereby, it becomes possible to generate the water flow that blows out from the center side of the stirring blade 1100, and the water flow can be strengthened. In addition, the stirring force is greatly increased by the generation of a blown water flow from the central portion that could not be generated by the conventional stirring blades. Particularly in a washing machine, by generating such a reciprocating water flow in the vertical direction, the stirring force can be strengthened, the detergent and the like can be easily dissolved, and the cleaning power can be improved.

  Furthermore, since the opening part 1140a exists in the center of the stirring blade 1100 and it sucks in from the lower side of the stirring blade 1100, the blowing water flow of a center part can be strengthened.

  Furthermore, by providing a plurality of protrusions on the cap-shaped protective cover, it is possible to obtain an effect of scouring the laundry (that is, an effect of scrubbing the laundry with the plurality of protrusions).

  In the stirring blade 1100 of the seventh embodiment, a plurality of protrusions may be provided so as to be aligned on the ridge line extending in the radial direction of the two blade portions 1101, as in the stirring blade 300 of the third embodiment. .

  Although the washing machine provided with the stirring blade has been described in the first to seventh embodiments, the stirring blade is not limited thereto, and can be applied to a stirring device for stirring various fluids.

  In the first to sixth embodiments, the blade portions 110, 120, 210, 220, 301, 401, 510, 520, 810, 820 have a plurality of hump-shaped protrusions 111, 121, 122, 211, 221. , 311, 411, 511, 521, 811, and 821 are provided, but the shape of the protrusion is not limited thereto.

  In the first to seventh embodiments, the blade portions 110, 120, 210, 220, 301, 401, 510, 520, 810, and 820 are provided on the upper surfaces of the stirring blades 100, 200, 300, 400, 500, and 800. Although provided, the present invention may be applied to a stirring blade provided with blade portions on both the upper surface and the lower surface.

[Eighth Embodiment]
Next, a stirring device provided with a stirring blade according to an eighth embodiment of the present invention will be described.

  The stirring device according to the eighth embodiment includes any one stirring blade of the first to seventh embodiments, a stirring tank (not shown) in which the stirring blade is rotatably disposed, and a fluid is stored. It has. Here, the fluid is not limited to washing water, and the stirring device of the eighth embodiment can be applied to stirring of any fluid.

  According to the stirring apparatus having the above configuration, the fluid in the stirring tank can be effectively stirred by the rotation of the stirring blade disposed in the stirring tank.

  Moreover, in the stirring apparatus provided with any one stirring blade of the fifth to seventh embodiments, the stirring blade disposed in the stirring tank rotates, so that the screw (stirring blade part) causes the stirring blade to enter the stirring tank. By generating a reciprocating water flow in the vertical direction, the solute can be efficiently dissolved in the solvent.

[Evaluation test of cleaning performance]
The inventor conducted a test while changing the size of the screw in order to evaluate the cleaning performance of the stirring blade of the fifth embodiment. In this evaluation test, a stirring blade without a screw is used as a comparative example, and a washing rate is measured by rotating a 0.5 kg laundry at 85 rpm for a predetermined time, and a 4.5 kg laundry at 85 rpm. It was rotated for a predetermined time, and the cleaning rate was measured and compared.

  This cleaning performance was evaluated according to the method of JIS standard number “JIS C 9606”, and the cleaning rate was calculated from the reflectance of the contaminated cloth before and after cleaning.

  Here, the cleaning rate is the ratio of the degree of cleaning measured in each washing machine based on the degree of cleaning performed in a standard washing machine defined by the standard number “JIS C 9606” of the JIS standard. . The laundry was carried out using 5 pieces of 100 g test cloth (load 0.5 kg) or 9 pieces of 500 g test cloth (load 4.5 kg).

  FIG. 30 shows the relationship between the ratio of the screw and the ratio of the cleaning rate in the evaluation of the cleaning performance. In this graph, the horizontal axis represents the ratio of the screw (screw diameter / stirring blade diameter), and the vertical axis represents the ratio of the washing rate (washing rate of the stirring blade with the screw / stirring blade without the screw). (Washing rate).

  According to this, the cleaning rate is strengthened by providing the screw until the screw occupying ratio is 0.5, but when the screw occupying ratio exceeds 0.5, the cleaning rate is drastically decreased.

  More desirably, by setting the ratio of the screw in the range of 0.18 to 0.32 at which an effect of 10% or more can be obtained at 0.5 kg, a clear improvement in the cleaning rate can be obtained.

  Detailed data used in the graph of FIG. 30 are shown in FIGS. FIG. 31 shows the ratio of the washing rate to the washing rate of 0.5 kg and FIG. 32 shows the ratio of the washing rate to the washing rate of 4.5 kg. Here, the diameter of the stirring blade is 400 mm.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to eighth embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st-8th embodiment is good also as one Embodiment of this invention.

  The present invention and the embodiment are summarized as follows.

The stirring blade for the washing machine of this invention is
Stirring blade bodies 501, 801, 1110 having blade portions 510, 520, 810, 820, 1101 for stirring water and laundry by rotation;
Agitating blades 600, 900, 1200 disposed in the central part of the agitating blade bodies 501, 801, 1110 and rotating together with the agitating blade bodies 501, 801, 1110;
A lid 700, 1000 that covers the stirring blades 600, 900, 1200 so as to prevent contact between the laundry and the stirring blades 600, 900, 1200;
The stirring blades 600, 900, and 1200 have a plurality of blades 602 and 902 that apply shearing force to water,
The lid bodies 700 and 1000 have a plurality of through holes 704.

  According to the above configuration, when water and laundry are agitated by the blade portions 510, 520, 810, 820, 1101 of the rotating stirring blade bodies 501, 801, 1110, the central portions of the stirring blade bodies 501, 801, 1110 The arranged stirring blades 600, 900, 1200 rotate together with the stirring blade bodies 501, 801, 1110, and the plurality of blades 602, 902 of the stirring blades 600, 900, 1200 give shearing force to water. give. As a result, a complicated flow in which the flow in the rotational direction generated by the stirring blade main bodies 501, 801, 1110 and the flow in the shear direction generated by the stirring blade portions 600, 900, 1200 is generated and the stirring force is increased. Powder detergent and laundry soap can be dissolved efficiently. At this time, the lid 700, 1000 covers the plurality of blades 602, 902 of the stirring blade portions 600, 900, 1200, thereby preventing the laundry from contacting the stirring blade portions 600, 900, 1200. Therefore, without providing a separate mechanism for driving the stirring blades 600, 900, and 1200, it is possible to quickly dissolve powder detergent, laundry soap, and the like with a simple configuration while suppressing damage to clothing. Further, by preventing undissolved residue of powder detergent or laundry soap, it is possible to suppress the growth of black mold and various germs, and it is possible to improve the cleaning power by increasing the concentration of the detergent contained in the cleaning liquid.

Moreover, in the stirring blade for a washing machine of one embodiment,
The radius R of the edge EG2 of the blade portions 510, 520, 810, 820, 1101 of the stirring blade main bodies 501, 801, 1110 is 2 mm or more, and the diameter of the stirring blade main bodies 501, 801, 1110 is 300 mm or more. is there.

  According to the above embodiment, the radius R of the edge EG2 of the blade portions 510, 520, 810, 820, 1101 of the stirring blade bodies 501, 801, 1110 is 2 mm or more, and the diameter of the stirring blade bodies 501, 801, 1110 By setting the length to 300 mm or more, it is possible to prevent the cloth from being caught by the blade portions 510, 520, 810, 820, 1101 and being damaged while increasing the stirring force of the stirring blade main bodies 501, 801, 1110 contacting the clothing. .

Moreover, in the stirring blade for a washing machine of one embodiment,
The radius R of the edge EG1 of the plurality of blades 602, 902 of the stirring blade portions 600, 900, 1200 is 2 mm or less, and the diameter of the stirring blade portions 600, 900, 1200 is the stirring blade body 501, 801, It is 1/2 or less of the diameter of 1110.

  According to the above embodiment, the radius R of the edge EG1 of the plurality of blades 602, 902 of the stirring blade portions 600, 900, 1200 is 2 mm or more, and the diameter of the stirring blade portions 600, 900, 1200 is the stirring blade body 501. , 801, 1110, the blades 602, 902 do not come into contact with the laundry in the stirring blades 600, 900, 1200 covered by the lid bodies 700, 1000. A more powerful water flow can be generated by a plurality of blades 602 and 902 having a radius R of 2 mm or less.

  Further, the stirring blade portions 600, 900, 1200 have a function of easily dissolving powder detergent and laundry soap and a function of increasing stirring ability by a vertical water flow. The larger the stirring blade portions 600, 900, 1200, the more powder Detergents and laundry soaps can be easily dissolved, but if the stirring ability exceeds 1/2 of the diameter of the stirring blade body 501,801,1110, the cleaning power of the stirring blade body 501,801,1110 will decrease. The diameter of the stirring blade portions 600, 900, and 1200 is desirably ½ or less of the diameter of the stirring blade body 501, 801, 1110.

Moreover, in the stirring blade for a washing machine of one embodiment,
The width W2 of the blade portions 510, 520, 810, 820, 1101 of the stirring blade main bodies 501, 801, 1110 is 10 mm or more.

  According to the above embodiment, the stirring blade bodies 501, 801, 1110 that come into contact with clothing are provided with a plurality of blade portions 510, 520, 810, 820, 1101 sharply thinned to increase the stirring force. Since it is caught and damaged, the width W2 of the blades 510, 520, 810, 820, and 1101 is preferably set to 10 mm or more.

Moreover, in the stirring blade for a washing machine of one embodiment,
The width W1 of the plurality of blades 602, 902 of the stirring blade portions 600, 900, 1200 is 10 mm or less.

  According to the above embodiment, since the stirring blade portions 600, 900, and 1200 are covered with the lid bodies 700 and 1000, the width W1 of the plurality of blades 602 and 902 can be reduced to 10 mm or less, and is lighter. It becomes easy to move and can generate a strong shear force while keeping the force required for rotation small.

Moreover, in the stirring blade for a washing machine of one embodiment,
The lid bodies 700 and 1000 are arranged so that at least a part thereof is connected to an extension line of a ridge line extending in the radial direction of the blade portions 510, 520, 810, 820, and 1101 of the stirring blade main bodies 501, 801, and 1110. Yes.

  According to the above embodiment, the lid bodies 700, 1000 are arranged so that at least a part thereof is connected to the extended line of the ridge line extending in the radial direction of the blade portions 510, 520, 810, 820, 1101 of the stirring blade main bodies 501, 801, 1110. By placing the lid 700, 1000 on the laundry, it is difficult for the lid 700, 1000 to be caught, and in the vicinity of the boundary between the blades 510, 520, 810, 820, 1101 of the stirring blade main bodies 501, 801, 1110 and the lid 700, 1000. Water flow can be strengthened by smooth flow.

Moreover, in the stirring blade for a washing machine of one embodiment,
While providing a plurality of protrusions 710, 720 on the surface of the lid 700, 1000,
The plurality of through holes 704 are provided in a region excluding the plurality of protrusions 710 and 720 of the lid bodies 700 and 1000.

  According to the above-described embodiment, the effect of washing the laundry with the plurality of protrusions 710 and 720 provided on the surfaces of the lids 700 and 1000 (that is, the effect of scrubbing the laundry with the plurality of protrusions 710 and 720). ) Is obtained.

  Further, by providing a plurality of through holes 704 in a region excluding the plurality of protrusions 710, 720 of the lid 700, 1000, the vertical reciprocating water flow generated by the stirring blades 600, 900, 1200 is generated by the lid 700, 1000 is not disturbed.

Moreover, in the stirring blade for a washing machine of one embodiment,
The stirring blade bodies 501, 801, 1110 and the lid bodies 700, 1000 were integrally formed.

  According to the embodiment, the structure can be simplified and the cost can be reduced by integrally forming the stirring blade main bodies 501, 801, 1110 and the lid 700, 1000.

  The washing machine of the present invention

  It has a stirring blade for any one of the above washing machines.

  According to the above configuration, it is possible to suppress the growth of black mold, various germs and the like, and it is possible to improve the cleaning power by increasing the concentration of the detergent contained in the washing water.

  The present invention can be used in a washing machine.

DESCRIPTION OF SYMBOLS 1 ... Washing machine 10 ... Outer box 11 ... Top plate 12 ... Base 13 ... Leg part 14 ... Laundry inlet 15 ... Top lid 20 ... Water tank 30 ... Stirrer tank 30a ... Bottom wall 30b ... Perimeter wall 31 ... Dehydration hole 32 ... Balancer 40 ... Drive unit 41 ... Motor 42 ... Belt mechanism 43 ... Clutch / brake mechanism 44 ... Dehydrating shaft 45 ... Agitating blade shaft 51 ... Connection pipe 60 ... Drain hose 61 ... Drain port 63 ... Seal holder 66 ... Drain space 67 ... Drain hole 68 ... Drain valve 70 ... Control part 100,200,300,400,500,800,1100 ... Agitating blades 100a, 200a, 300a ... Peripheral parts 102,202,502,802 ... Depression parts 103a, 103b, 203a, 203b, 503a, 503b, 803a, 803b ... ribs 104, 204, 304, 504, 804 ... small holes 106, 506 ... shaft holes 110, 120, 210, 220, 301, 401, 510, 52 , 810, 820, 1101 ... blades 111, 121, 122, 211, 221, 311, 411, 511, 521, 811, 821 ... projections 117, 127, 517, 527 ... grooves 117 a, 517 a, 527 a ... open end 118, 518, 528 ... blade part 130, 530 ... boss part 240 ... through hole 301a, 1101a ... first side wall 301b, 1101b ... second side wall 301c, 1101c ... upper wall 302, 402, 1102 ... bottom face part 501, 801, 1110 ... Stirring blade body 501a, 801a, 1110a ... Peripheral part 540, 840, 1140 ... Screw storage part 540a, 1140a ... Opening part 550, 850, 1150 ... Shaft part 550a ... Key 600, 900, 1200 ... Screw 601, 901 ... Cylindrical portions 601a, 901a ... shaft holes 601b, 901b ... key grooves 602,902 ... blades 602a, 9 2a ... front edge 700,1000 ... protective cover 701 ... dome portion 702 ... cylindrical portion 703 ... leg portion 703a ... engaging pawl 704 ... small holes 710 ... first protrusion 720: second protrusion 902b ... trailing edge

Claims (5)

A stirring blade body having a blade portion for stirring water and laundry by rotation;
A stirring blade portion disposed in a central portion of the stirring blade body and rotating integrally with the stirring blade body;
A lid that covers the stirring blade so as to prevent contact between the laundry and the stirring blade,
The stirring blade part has a plurality of blades that give shearing force to water,
A stirring blade for a washing machine, wherein the lid has a plurality of through holes. The stirring blade for a washing machine according to claim 1,
An agitating blade for a washing machine, wherein the radius R of the edge of the blade portion of the agitating blade body is 2 mm or more and the diameter of the agitating blade body is 300 mm or more. The stirring blade for a washing machine according to claim 1 or 2,
For the washing machine, wherein the radius R of the edges of the plurality of blades of the stirring blade portion is 2 mm or less and the diameter of the stirring blade portion is 1/2 or less of the diameter of the stirring blade body. Stirring blade. In the stirring blade for a washing machine according to any one of claims 1 to 3,
While providing a plurality of protrusions on the surface of the lid,
A stirring blade for a washing machine, wherein the plurality of through holes are provided in a region excluding the plurality of protrusions of the lid.   A washing machine comprising the stirring blade for a washing machine according to any one of claims 1 to 4.