JP6116376B2 - Electric washing machine - Google Patents

Description

  The present invention relates to an electric washing machine.

  As background art of this technical field, there is JP-A-8-191988 (Patent Document 1). This publication describes a washing machine in which an inner tub (washing tub) in which a pulsator is rotatably arranged at the center bottom is enclosed in an outer tub, and a circulation channel is formed by an inner tub and an inner tub cover in the inner tub. (See summary). In this washing machine, as the pulsator rotates, the back blades provided on the lower surface of the pulsator suck up the water in the lower part of the outer tub and discharge it from the discharge port in the upper part of the inner tub through the circulation channel, forcing the water in the outer tub. Circulate (see paragraph 0006).

  JP 2012-249775 A (Patent Document 2) discloses an outer tub for storing water, an inner tub that is rotatably supported in the outer tub and contains laundry, and an inner bottom surface of the inner tub. A washing machine with rotating blades arranged and rotated is described (see abstract). In this washing machine, on the front side of the rotary blade, a top portion that is continuous from the center side to the outer peripheral side and an inclined surface that is inclined downward from the top portion in the circumferential direction are formed, and the surface of the rotary blade is waved gently. Is formed. Then, when the rotor blades rotate, the clothes are flipped up by the rotor blades, and the clothing located in the lower layer and the clothing located in the upper layer are efficiently exchanged in the inner tank (see paragraph 0071). On the back side of the rotor blade, circumferential ribs and radial ribs are provided to ensure the strength of the rotor blade (see paragraph 0073).

JP-A-8-191988 JP 2012-249775 A

  In patent document 1, there is no specific description about the structure of the back side (back surface) of a pulsator including a back blade. In order to increase the flow rate of water sent from the pulsator to the circulation flow path, it is necessary to devise a structure on the back side of the rotor blade that constitutes the back blade. Consideration was not enough.

  In patent document 2, there is no consideration about forcedly circulating the water in an outer tank using a rotary blade like the pulsator of patent document 1. FIG.

  In the following description, the pulsator disclosed in Patent Document 1 and the rotating blade disclosed in Patent Document 2 will be described as rotating blades without particular distinction.

  The objective of this invention is providing the electric washing machine which can increase the flow volume of the water sent to a circulation flow path from a rotary blade by devising the structure of the back side of a rotary blade.

In order to achieve the above object, an electric washing machine of the present invention includes an outer tub for storing water, an inner tub provided inside the outer tub, and a rotary vane provided rotatably at the bottom of the inner tub. And a driving device that rotationally drives the rotary blade, and the inner tub has a circulation channel for circulating washing water from the upper part of the inner tub and spraying the washing water into the inner tub. The blade is constituted by a plurality of radial ribs provided in the radial direction, and sucks the washing water at the bottom of the outer tub and circulates the washing water in the circulation channel, and is provided adjacent to the back blade in the circumferential direction. A circumferential rib that intersects one radial rib on the lower surface side of the rotary blade, the circumferential rib having at least a part in the circumferential direction, and the circumferential rib is a radial rib. Located above the height position of the lower end of the radial rib at the intersecting portion In the electric washing machine configured as described above, the rotary blade includes an annular ring part that goes around the outer peripheral part at the same height position, and a raised part that is positioned above the height position of the annular part. And a trough portion located below the height position of the annular portion, and a washing water discharge port by the back blade is configured below the annular portion, and the radial rib is formed at the outer peripheral end. The annular portion lower dimension is a height-direction interval between the lower end portion of the radial rib at the outer peripheral end portion and the annular portion at a portion facing the water inlet of the circulation channel. A plurality of the circumferential ribs are formed so as to be located at different radial positions, and are formed to be larger than the upper dimension of the annular part, which is a height direction interval between the apex and the annular part , The depth dimension from the annular part in the valley part is larger than the upper dimension of the annular part. The radial ribs on the outer side of the circumferential rib positioned in the outermost periphery is not provided in the valleys.

  ADVANTAGE OF THE INVENTION According to this invention, the flow volume of the water sent to a circulation flow path from a rotary blade can be increased by devising the structure of the back side of a rotary blade.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is sectional drawing which looked at the electric washing machine from the right side about one Example (Example 1) of the electric washing machine which concerns on this invention. It is a perspective view which shows the shape of the upper surface side about one Example (Example 1) of the rotary blade based on this invention. It is a top view which shows the shape of the upper surface side about one Example (Example 1) of the rotary blade based on this invention. It is sectional drawing showing the IV-IV arrow cross section of the rotary blade shown in FIG. It is a perspective view which shows the shape of the lower surface side about one Example (Example 1) of the rotary blade based on this invention. It is a top view which shows the shape of the lower surface side about one Example (Example 1) of the rotary blade based on this invention. FIG. 7 is a view (viewed in the direction of arrow VII) of the part indicated by A7 in FIG. It is a figure which shows the modification of the part shown to the VII arrow line view of FIG. It is a top view which shows the shape of the lower surface side about one Example (Example 2) of the rotary blade based on this invention. It is sectional drawing which shows the cross section similar to FIG. 4 about the rotary blade based on Example 2 of this invention. It is a top view which shows the shape of the lower surface side about one Example (Example 3) of the rotary blade based on this invention. It is sectional drawing which shows the cross section similar to FIG. 4 about the rotary blade which concerns on Example 3 of this invention.

  Examples according to the present invention will be described below.

  An embodiment (Embodiment 1) according to the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing an internal structure of an electric washing machine 100 according to the present embodiment, and is a sectional view of the electric washing machine viewed from the right side.

  Reference numeral 1 denotes a rectangular cylindrical outer frame constituting the outer shell. Reference numeral 2 denotes a top cover attached to the upper part of the outer frame 1. At the center of the top cover 2, a laundry input port 2a is provided. Reference numeral 3 denotes a lid attached to the top cover 2 so as to cover the laundry input port 2a. An operation panel 8 having a display and various operation button switches is provided in the front portion of the top cover 2 (front side of the laundry input port 2a). The operation panel 8 is electrically connected to a control device 14 provided at the bottom of the outer frame 1. A power switch (not shown) is disposed in the vicinity of the operation panel 8 of the top cover 2. A water supply electromagnetic valve 4 and a detergent and finish agent charging container 28 are provided at the rear part of the top cover 2 (the rear side from the laundry charging port 2a).

  Reference numeral 9 denotes a washing / dehydrating tub for storing laundry such as clothes. The washing and dewatering tub 9 is provided with a large number of small through holes (small holes) 9a for water flow and ventilation on the outer peripheral wall, and a large number of small through holes for water flow and ventilation on the bottom wall. (Small hole) 9b is provided. A balancer 9c is provided at the upper edge of the washing and dewatering tub 9, and a rotary vane 11 is rotatably installed at the inner bottom. Details of the rotary blade 11 will be described later.

  Reference numeral 10 denotes an outer tub that encloses the washing / dehydrating tub 9 and serves as a water receiving tub that receives washing water and rinsing water (hereinafter simply referred to as washing water). The outer tub 10 is suspended from the outer frame 1 by four support rods that are suspended and suspended from corner plates 7 provided at the four corners of the upper end of the outer frame 1. A shock absorber 5 is provided at the lower end of the four support rods, and the shock absorber 5 is locked to a lock portion 6 provided on the outer tub 10 side. For the outer tub 10, the washing / dehydrating tub 9 may be called an inner tub.

  At the outer bottom of the outer tub, an electric motor 13 for rotationally driving the washing / dehydrating tub 9 and the rotary blade 11, a rotational drive mode for rotating the rotary wing 11 independently, and a rotation of the washing / dehydrating tub 9 are rotated. A washing / dehydrating drive device having an electromagnetic clutch mechanism 12 for switching between a rotational drive mode for integrally rotating the blades 11 is attached. The washing / dehydrating drive device is further provided with a planetary gear reduction mechanism and the like. The rotational drive mode in which the rotary blade 11 is rotationally driven independently is used during washing (washing and rinsing). In this rotational drive mode during washing, the washing and dewatering tub 9 is fixed so as to be stationary, and the rotary blade 11 is rotationally driven, and the washing and dewatering tub 9 is released so that it can freely rotate (fixed) In a mode in which the rotary vane 11 is driven to rotate. Further, the rotational drive mode in which the washing and dewatering tub 9 and the rotary vane 11 are rotationally driven together is used during dehydration.

  A water level sensor 21 is provided in the top cover 2. An air trap 21 a is provided at the bottom of the outer tub 10, and the pressure in the air trap 21 a is transmitted to the water level sensor 21 via the tube 21 b, and the water level sensor 21 detects the water level in the outer tub 10. The water level sensor 21 is electrically connected to the control device 14, and the water level detected by the water level sensor 21 is transmitted to the control device 14.

  A vibration sensor 27 is installed outside the side surface of the outer tub 10 and is electrically connected to the control device 14. The vibration sensor 27 detects the vibration of the outer tub 10 at the time of washing or dehydration, and when a large vibration is detected, the control device 14 interrupts the operation or performs an operation necessary for eliminating the vibration. .

  Reference numeral 15 denotes a drain electromagnetic valve. When the drainage electromagnetic valve 15 is opened, the washing water collected in the outer tub 10 or the water squeezed from the laundry by dehydration is drained from the outer tub 10 at the bottom of the outer tub 10 and the solenoid valve. It drains through the drainage hose 24 connected to 10c.

  As described above, the rotary vane 11 is rotatably installed on the inner bottom of the washing and dewatering tub 9. At the bottom of the washing / dehydrating tub 9 around the rotary blade 11, a ring-shaped lower annular ring 9 d for narrowing the gap between the outer periphery of the rotary blade 9 and the inner periphery of the washing / dehydrating tank 9 is provided. It has been. The lower ring 9 d has a cylindrical inner periphery, and the lower surface is in close contact with the bottom surface of the washing / dehydrating tub 9. And the labyrinth is formed by the outer peripheral part of the rotary blade 11 and the lower ring 9d, and the washing water hardly flows through the gap between the rotary blade 11 and the lower ring 9d. A plurality of notches 9e are formed in the lower ring 9d, and wash water circulation channel covers 71, 81 are provided in the notches 9e. Circulating water channel covers 71 and 81 have a substantially C-shaped cross section when cut along a horizontal plane. That is, the circulating water channel covers 71 and 81 are washed from the circumferential wall surface provided so as to protrude from the inner circumferential surface of the washing and dewatering tub 9 along the substantially circumferential direction and from both circumferential ends of the circumferential wall surface. A bending portion bent toward the dewatering tub 9, and the bent portion is abutted against the washing and dewatering tub 9. Thereby, the circulating water channels 71b and 81b are formed between the back surfaces of the circulating water channel covers 71 and 81 and the washing and dewatering tub 9.

  Water inlets 71 a and 81 a are provided at the lower ends of the circulation channels 71 b and 81 b so as to face the outer peripheral side end of the back blade 11 m provided on the back side of the rotary blade 11. Discharge ports 71c and 81c are provided above the circulation water channels 71 and 81, and are configured to discharge wash water from the vicinity of the balancer 9c into the washing and dewatering tub 9. In the present embodiment, the discharge ports 71c and 81c are formed above the circulating water channel covers 71 and 81. The discharge ports 71c and 81c may be configured such that the height position can be changed. A lint filter 72 is detachably attached to the discharge port 71c. The discharge port 81c is formed in a slit shape that opens into the washing / dehydrating tub 9 and opens in a substantially horizontal direction.

  When the rotating blade 11 rotates, the back blade 11m becomes a centrifugal pump, the pressure near the center of the bottom surface of the rotating blade 11 decreases, and the gap 91 between the outer tub 10 and the washing / dehydrating tub 9 (particularly the bottom of the outer tub 10). ) Is sucked from a through hole 9b provided in the bottom surface of the washing and dewatering tank 9. And the wash water pushed out to radial direction outer side with the centrifugal force of the back blade | wing 11m flows upwards in the circulation water channels 71b and 81b from the water inlets 71a and 81a. Thus, in the present embodiment, the rotary blade 11 provided with the back blade 11m serves as an impeller of the centrifugal pump, and pumps washing water to the discharge ports 71c and 81c of the circulation water channels 71b and 81b.

  The washing water that has risen in the circulation water channel 71 b is removed from the lint by the lint filter 72 and enters the washing and dewatering tub 9. On the other hand, the wash water that has risen in the circulation water channel 81b is sprayed in the form of a shower near the center of the washing and dewatering tank 9 from the slit-like discharge port 81c. Thereby, washing water is evenly sprayed on the laundry, and cleaning efficiency can be improved. The washing water in the washing / dehydrating tub 9 flows through the through hole 9 a and flows into the gap 91 between the outer tub 10 and the washing / dehydrating tub 9.

  The rotary blade 11 will be described in detail with reference to FIGS. 2 to 7B.

  First, with reference to FIG. 2 thru | or FIG. 4, the upper surface (surface) of the rotary blade 11 is demonstrated. FIG. 2 is a perspective view showing the shape of the upper surface side of the rotary blade according to the present embodiment. In FIG. 2, radial ribs formed on the lower surface side are omitted. FIG. 3 is a plan view showing the shape of the upper surface side of the rotary blade according to the present embodiment. 4 is a cross-sectional view showing a cross section taken along the line IV-IV of the rotary blade shown in FIG. 3.

  As shown in FIG. 2, the rotary blade 11 has a shape having a raised portion 11 a and a valley (low portion) 11 b on a bowl-shaped concave curved surface having a low central portion and a high outer peripheral side. Moreover, the rotary blade 11 has an annular ring portion (mouth edge portion) 11j that goes around the outer peripheral portion at the same height position at a position that becomes the mouth edge of the bowl-shaped concave curved surface. A plurality of raised portions 11a are formed on the rotary vane 11, and a valley portion 11b is formed between the raised portions 11a and the raised portions 11a. That is, the rotary blade 11 in the present embodiment has a raised portion 11a and a trough (low portion) 11b on the operating surface that comes into contact with the laundry and applies mechanical force to the laundry. The raised portion 11a is formed so that its height gradually increases from the rotation center P toward the outer peripheral direction. Moreover, the inclined surface 11i is formed in the trough part 11b on the outer peripheral side.

  As shown in FIG. 3, in the present embodiment, the two raised portions 11 a and the two valley portions 11 b are provided point-symmetrically with respect to the rotation center P, and are located at a radius r from the rotation center P. Up to a straight line, the outer peripheral side from the position of the radius r forms an arc shape and is curved in one direction (see 11a1 and 11b1). As a result, the two raised portions 11a are substantially S-shaped on the upper surface (surface) of the rotary blade 11 as viewed from above.

  The ridge line 11a1 of the raised portion 11a that extends from the rotation center P to the outer periphery of the rotary blade 11 is entirely higher than the annular portion 11n, and the outer peripheral side is higher than the rotation center P side. The rotation center P is also higher with respect to the annular portion 11n. On the other hand, the trough portion 11b is a substantially intermediate portion between the rotation center P and the annular portion 11n and forms a recess whose back surface is substantially the same height as the lowermost portion of the rotary blade 11. As will be described in detail later, this shape serves to reduce the height direction dimension of the rotary blade 11 and increase the amount of discharged water discharged from the discharge ports 71c and 81c through the circulating water channels 71b and 81b. Yes.

  In the valley portion 11b, a plurality of protrusions 11d curved in the same direction as the raised portion 11a are formed at intervals in the circumferential direction. In the present embodiment, the protrusions 11d are provided at a total of four locations. A plurality of crown-shaped bulged portions 11 e are provided on the upper surface of the rotary blade 11. The bulging portion 11e is distributed and arranged in a portion other than the ridge line region of the protruding portion 11a. The protrusion 11d and the bulging portion 11e have the same effect as the washing board, and improve the cleaning power.

  Further, the rotary blade 11 is formed with a large number of through holes 11c penetrating from the upper surface to the lower surface (back surface). The through hole 11c improves water flow and ventilation. The through hole 11c is provided mainly in the valley portion 11 while avoiding the ridge 11d and the bulging portion 11e, avoiding the ridge line region of the raised portion 11a.

  Due to the above-described surface shape of the rotary blade 11, the surface of the rotary blade 11 when it is cut and developed in the circumferential direction at an arbitrary radial position of the rotary blade 11 has a wavy shape. However, the position where the height difference between the ridge line 11a1 of the raised portion 11a and the valley bottom 11b1 of the valley portion 11 is the maximum is the radial position where the valley bottom 11b1 is the lowest, and the closer to the inner diameter side and the outer diameter side from this radial position. The height difference becomes smaller.

  In the present embodiment, the height of the raised portion 11a is increased in order to increase the vertical movement of the laundry. For this reason, as shown in FIG. 4, the raised part 11a is made higher than the annular part 11j. Thereby, the raised part 11a has a height difference of h1 with respect to the annular part 11j. If a large movement of the laundry is not necessary, the raised portion 11a may be the same height as the annular portion 11j or may be lowered. However, if the raised portion 11a is lowered, the volume formed between a plurality of back blades, which will be described later, is reduced, and the amount of water supplied to the circulating water channels 71b and 81b is reduced.

  In the periphery of the rotation center P, a bulging portion 111k bulging upward is formed, and a space for accommodating a fixing screw for fixing the rotary blade 11 to the washing / dehydrating drive device is secured.

  The configuration of the electric washing machine described above and the shape of the upper surface of the rotary blade 11 are common to Examples 2 and 3 described later.

  Next, the lower surface (back surface) of the rotary blade 11 will be described with reference to FIGS. 4 to 7B. FIG. 5 is a perspective view showing the shape of the lower surface side of the rotary blade 11 according to the present embodiment. FIG. 6 is a plan view showing the shape of the lower surface side of the rotary blade according to the present embodiment. FIG. 7A is a view (a view taken along arrow VII) of the part indicated by A7 in FIG. 6 as viewed from the direction indicated by VII. FIG. 7B is a diagram showing a modification of the portion indicated by A7 as viewed from the direction indicated by VII in FIG.

  As shown in FIGS. 4 to 6, the rotating blade 11 has a thin plate-like working surface 11 l that constitutes a raised portion 11 a, a valley portion 11 b, etc., except for the bulging portion 11 k around the rotation center P. Yes. A radial rib 11m (11m1 to 11m12) extending in the radial direction and a circumferential rib (annular rib) 11n (11n1 to 11n4) formed in a ring shape in the circumferential direction are formed on the lower surface (back surface) of the rotary blade 11. And are provided. The radial ribs 11m and the circumferential ribs 11n reinforce the working surface 11l that contacts the laundry of the rotary vane 11.

  In the present embodiment, the radial rib 11m is formed linearly from the rotation center P side toward the outer peripheral direction. That is, the radial ribs 11m1 to 11m12 are radially formed from the rotation center P toward the outer peripheral direction. Further, the radial ribs 11m4 and 11m10 provided in the vicinity of the valley bottom 11b1 are not provided on the outer peripheral side than the circumferential rib 11n1 located on the outermost periphery.

  Each of the circumferential ribs 11n1 to 11n4 is provided with a gap between the circumferential ribs adjacent to each other at a predetermined radial position. The radius of the circumferential rib 11n1 is the largest, and is located on the outermost side among the circumferential ribs 11n1 to 11n4. The radius of the circumferential rib decreases from 11n1 to 11n2, 11n3, 11n4 in this order, and the circumferential rib 11n4 is located on the innermost side. In the present embodiment, the circumferential rib 11n1 is disposed at a position where the radius is approximately half (1/2) the radius of the rotary blade 11.

  The rotary blade 11 is made up of a working surface 11l that forms a raised portion 11a and a valley portion 11b, an annular portion 11j, a bulging portion 11k, radial ribs 11m1 to 11m12, and circumferential ribs 11n1 to 11n4. It is made from a single piece of material. The through hole 11c, the protrusion 11d, and the bulging portion 11e are also formed at the same time.

  The radial rib 11m in this embodiment functions as a back blade of a centrifugal pump that sucks up washing water at the bottom of the outer tub 10 and sends it to the circulation water channels 71b and 81b.

  As described above, the rotary vane 11 forms a bowl-shaped concave curved surface having a mouth edge portion 11j as a whole, and a raised portion 11a and a valley portion 11b are formed on the upper surface side. At this time, by forming the valley portion 11b to be lower than the rim portion 11j, the back blade can be configured on the lower surface side while suppressing the height of the rotary blade 11. When the rotating blade 11 is cut and developed in the circumferential direction, as shown in FIG. 4, the upper surface of the rotating blade 11 forms a gentle curve near the ridge line 11a1 of the raised portion 11a, and the ridge line 11a1 is formed from this curved portion. It is connected to the valley bottom 11b1 by gentle inclined surfaces formed on both sides in the circumferential direction. As described above, the rotary blade 11 has the operating surface 11l formed in a thin plate shape, and the back surface thereof has the same shape as the upper surface (front surface). For this reason, a large space is formed on the lower surface side of the raised portion 11a. By sucking the washing water at the bottom of the outer tub 10 into this space and feeding it to the circulation channels 71b and 81b, a large amount of water can be secured, and the amount of discharge water from the discharge ports 71c and 81c of the circulation channels 71b and 81b. Can be increased. In the present embodiment, since the raised portion 11a is made higher than the rim portion 11j, the space formed at a position lower than the rim portion 11j on the lower surface side of the raised portion 11a can be made larger. The amount of water can be increased. At this time, since the back blade is constituted by the radial rib 11m, it is not necessary to newly add the back blade 11m1 to 11m12.

  More specifically, in the rotary vane 11 of the present embodiment, the raised portion 11a is located above the height position of the annular portion 11j, and the valley portion 11b is located from the height position of the annular portion 11j. Is also located below. In the rotary blade 11, the lower dimension d1 from the annular portion is larger than the upper dimension h1. The depth dimension d2 from the annular part 11j in the valley part 11b is larger than the height dimension h1 from the annular part 11j in the raised part 11a. Thereby, the cross-sectional area of the discharge port (back blade 11m formation part) of the centrifugal pump facing the water inlets 71a and 81a of the circulation water channels 71b and 81b can be increased (especially by increasing the height direction dimension). The amount of washing water fed into the circulation water channels 71b and 81b can be increased.

  Note that the amount of water discharged from the discharge ports 71c and 81c periodically changes and pulsates depending on the positional relationship between the water inlets 71a and 81a of the circulating water channels 71b and 81b and the raised portions 11a. Increasing the number of raised portions 11a formed on the rotary blade 11 shortens the discharge cycle and reduces the amount of water discharged in one cycle. In order to increase the amount of water discharged in one cycle, it is better that the number of raised portions 11a is smaller. However, if the raised portion 11a is made one, the time during which the valley portion 11b faces the water inlets 71a and 81a becomes longer, and washing water is not discharged from the outlets 71c and 81c, or the washing water discharged is discharged. The time for the amount of water to decrease increases. It is necessary to determine the number of raised portions 11a in consideration of the washing effect on the laundry, the discharge amount from the discharge ports 71c and 81c, and the discharge cycle. In the present embodiment, the number of raised portions 11a is two.

  Here, the circumferential ribs (annular ribs) 11n1 to 11n4 which are one of the features of the present embodiment will be described with reference to FIGS. 5 to 7B.

  The rotor blade of Patent Document 2 described above is not considered for forced circulation of water in the outer tub. If a back blade is provided on the back side of the rotary blade of Patent Document 2, and the bottom blade tries to suck up the water in the lower part of the outer tub, the following problem occurs. In the rotor blade of Patent Document 2, a plurality of circumferential ribs are provided on the lower surface thereof. A plurality of circumferential ribs are provided on the lower surface of the rotor blade with different radial positions. The rotor blade is provided with a radial rib, and the radial rib is used as a back blade. In this case, the area on the inner peripheral side (radially inner side) than the circumferential rib provided on the outermost peripheral side of the rotor blade cannot be used for water supply. The area where the circumferential ribs are provided cannot function as a centrifugal pump, and the amount of circulating water per hour is reduced.

  In the present embodiment, a structure is proposed in which the region where the circumferential rib is formed effectively functions as a centrifugal pump.

  In this embodiment, the radial ribs (back blades) are between 11m1 and 11m2, between 11m2 and 11m3, between 11m3 and 11m4, between 11m4 and 11m5, between 11m7 and 11m8, and between 11m8 and 11m9. The lower ends of the circumferential ribs 11n1 and 11n2 provided between 11m9 and 11m10 and between 11m10 and 11m11, at least in part in the circumferential direction, these circumferential ribs 11n1 and 11n2 are in the respective radial directions. Ribs 11m1, 11m2, 11m3, 11m4, 11m5, 11m7, 11m8, 11m9, 11m10, 11m11, radial ribs 11m1, 11m2, 11m3, 11m4, 11m5, 11m7, 11m8, 11m9, 11m10, and 11m11 It is higher than the position (Fig. 4 5 reference)).

  In this embodiment, the lower ends of the circumferential ribs 11n1 between the radial ribs 11m1 to 11m5 are at the same height position. The lower ends of the circumferential ribs 11n2 between the radial ribs 11m1 to 11m5 are at the same height position.

  By making the lower end height of the circumferential ribs 11n1 and 11n2 higher than the lower end of the radial rib 11m, the radially inner space with respect to the circumferential rib 11n2 is the radially outer space with respect to the circumferential rib 11n2. The space on the radially inner side with respect to the circumferential rib 11n1 communicates with the space on the radially outer side with respect to the circumferential rib 11n1. Accordingly, the radially inner space with respect to the circumferential rib 11n2 communicates with the radially outer space with respect to the circumferential rib 11n1. In this way, by increasing the lower end height of the circumferential ribs 11n1 and 11n2 relative to the lower end of the radial rib 11m, the circumferential ribs 11n1 and 11n2 have a space radially inward with respect to each circumferential rib. And openings 11n1o and 11n2o that communicate with the outer space in the radial direction can be provided.

  In addition, in FIG. 5, since the rotary blade 11 is shown upside down, the circumferential ribs appear to be lower than the radial ribs.

  Thereby, the wash water contained between the circumferential rib 11n1 and the circumferential rib 11n2 and between the circumferential rib 11n2 and the circumferential rib 11n3 can be flowed to the outer peripheral side, and the amount of water fed into the circulation water channels 71b and 81b Can be increased. That is, the centrifugal pump can be configured in a wider range from the outer peripheral side of the rotary blade 11 to the rotation center P side, and in particular, the portion on the rotation center P side of the rotary blade 11 can be effectively utilized.

  Between the radial ribs 11m5 and 11m7 and between 11m11 and 11m1, the lower end of the circumferential rib 11n1 is at the same height as the lower end of the radial rib 11m. In this case, the wash water cannot be sent out from the portion closer to the rotation center P than the circumferential rib 11n1 to the circulation channels 71b and 81b. Originally, between the radial ribs 11m5 and 11m7 and between 11m11 and 11m1, the valley bottom 11b1 of the valley portion 11b is provided on the surface side, and the space formed radially inward of the circumferential rib 11n1 The volume is small. In addition, since the deepest part of the valley bottom 11b1 is located on the outer peripheral side of the circumferential rib 11n1, even if an opening is provided in the circumferential rib 11n1, the valley bottom 11b1 is obstructed and sent to the circulation channels 71b and 81b. The amount of washing water that can be dispensed is small. For this reason, between the radial ribs 11m5 and 11m7 and between 11m11 and 11m1, the lower end of the circumferential rib 11n1 and the lower end of the radial rib 11m are at the same height.

  In the example shown in FIG. 5, as shown in FIG. 7A, the height of the circumferential rib 11n1 is uniformly increased by h2 over the entire circumferential direction between two adjacent radial ribs 11m3 and 11m4. . In other words, an interval between two adjacent radial ribs 11m3 and 11m4 is opened at a height of h1 over the entire circumferential direction. Also in the circumferential rib 11n2, the opening height is different, but the circumferential rib 11n2 is opened over the entire circumferential direction.

  The way (opening shape) of the openings 11n1o and 11n2o provided to the circumferential ribs 11n1 and 11n2 may be changed depending on each section divided by the radial ribs 11m as shown in FIG. 7B. In this case, for example, the height h3 (h3 <h2) of the circumferential rib 11n1'a can be made different from the height h2 of the circumferential rib 11n1 '. In addition, the upper side of the opening can be inclined like 11n1'b without being horizontal. Further, the opening 11n1o 'may be provided not in the entire circumferential direction between the two adjacent radial ribs 11m3 and 11m4 but in a part in the circumferential direction. In this case, radial ribs such as 11n1'c may be left. The shapes of the openings 11n1o and 11n2o can be variously changed, and it is important that a communication path for flowing washing water from the radially inner side to the outer side of the circumferential rib is formed.

  Although FIG. 7A and FIG. 7B demonstrated the circumferential ribs 11n1 and 11n2 between the radial ribs 11m3 and 11m4, the same applies to the circumferential ribs between the other radial ribs. Further, the number of circumferential ribs provided in the radial direction is not limited to four. The circumferential ribs that provide the openings are not limited to the circumferential ribs 11n1 and 11n2. However, it is necessary to provide an opening in at least the circumferential rib disposed on the outermost peripheral side. The number of radial ribs 11m is not limited to twelve.

  Next, Embodiment 2 according to the present invention will be described with reference to FIGS.

  FIG. 8 is a plan view showing the shape of the lower surface side of the rotary blade of the present embodiment. FIG. 9 is a cross-sectional view (cross-sectional view taken along the line IX-IX shown in FIG. 8) showing the same cross section as that of FIG. 4 for the rotary blade of the present embodiment.

  In the present embodiment, the shapes of the radial ribs 11m1 to 11m5 and 11m7 to 11m11 of the rotary blade 11 of the first embodiment are changed as will be described later. Other configurations of the rotary blade 11 and the entire configuration of the electric washing machine 100 in the first embodiment are commonly applied to the present embodiment.

  In the rotary blade 11 ′ of the present embodiment, as shown in FIG. 8, on the inner peripheral side of the circumferential rib 11n1 located on the outermost peripheral side, the radial ribs extend from the rotation center P side toward the outer peripheral side. 11m1 ′ to 11m12 ′ are formed radially. And in the outer peripheral side rather than the circumferential rib 11n1, radial rib 11m1'-11m5 'and 11m7'-11m11' are with respect to the direction which each radial rib comprises in the inner peripheral side rather than the circumferential rib 11n1. It is provided so as to be inclined. Note that the inclination directions of the radial ribs 11m1 'to 11m5' and 11m7 'to 11m11' are the same.

  Thereby, when the rotary blade 11 ′ rotates in the direction in which the outer peripheral side portions 11m1a ′ to 11m5a ′ and 11m7a ′ to 11m11a ′ of the radial ribs are inclined (in the direction of arrow R in FIG. 8), the circulating water channel 71b, The amount of washing water sent to 81b increases, and the amount of washing water discharged from the discharge ports 71c and 81c can be increased. This rotational direction is the direction in which the back blade constituted by the radial ribs 11m scoops out the washing water.

  On the other hand, when the rotary blade 11 ′ is rotated in the direction opposite to the inclination direction of the radial rib, the amount of washing water fed into the circulation water channels 71b and 81b is reduced. However, the washing water discharged from the discharge port 81c is increased by increasing the amount of washing water fed from the rotating blade 11 'to the circulation channel 81b in at least one of the two rotation directions of the rotating blade 11'. Increase momentum.

  In this embodiment, the radial ribs 11m1 ′ to 11m5 ′ and 11m7 ′ to 11m11 ′ are linearly formed on the radially inner side of the circumferential rib 11n1, but on the most radially inner side where the opening 11n2o is provided. You may incline an outer peripheral side from the circumferential direction rib 11n2 located. On the radially inner side of the circumferential rib 11n3, each radial rib 11m does not have a function of feeding washing water. Therefore, as far as the water supply function as a centrifugal pump is concerned, there is no point in inclining each radial rib 11m radially inward of the circumferential rib 11n3.

  In addition, instead of inclining the outer peripheral side portions 11m1a ′ to 11m5a ′ and 11m7a ′ to 11m11a ′ of the radial ribs formed linearly with respect to the radial direction, the radial ribs 11m1 ′ to 11m5 ′ and 11m7 ′ to 11m11 ′ May be formed so as to be curved in a curved line on the paper surface so that the end on the outer peripheral side is located at the same position as in FIG.

  In the present embodiment, the amount of washing water fed from the rotary blade 11 'to the circulating water channel 81b is increased only by the inclined structure or the curved structure of the outer peripheral side portions 11m1a' to 11m5a 'and 11m7a' to 11m11a 'of the radial ribs. be able to. Accordingly, a structure in which the openings 11n1o and 11n2o are not formed in the circumferential ribs 11n1 and 11n2, respectively, may be used. That is, the circumferential ribs 11n1 and 11n2 have lower ends throughout the entire circumferential direction, and the lower ends of the radial ribs 11m1 ′ to 11m12 ′ at the portions where the circumferential ribs 11n1 and 11n2 intersect the radial ribs 11m1 ′ to 11m12 ′. , They may be formed at the same height position.

  Of course, by providing the openings 11n1o and 11n2o in the circumferential ribs 11n1 and 11n2, it is possible to further increase the amount of washing water fed to the circulating water channel 81b.

  Next, Embodiment 3 according to the present invention will be described with reference to FIGS.

  FIG. 10 is a plan view showing the shape of the lower surface side of the rotary blade 11 ″ of the present embodiment. FIG. 11 is a cross-sectional view (cross-sectional view taken along the line IX-IX shown in FIG. 8) showing the same cross section as that of FIG. 4 for the rotary blade 11 ″ of the present embodiment. In FIG. 10, the lower surface (rear surface) of the rotary blade 11 ″ is shown through the plate-like member 11 p.

  This embodiment differs from the rotary blade 11 of the first embodiment in that a part of the circumferential rib is eliminated and a thin plate-like member is provided at the lower end of the outer peripheral portion of the radial rib. Other configurations of the rotary blade 11 and the entire configuration of the electric washing machine 100 in the first embodiment are commonly applied to the present embodiment.

  Specifically, in this embodiment, the circumferential ribs 11n1 to 11n3 are eliminated. Moreover, the thin plate-shaped member 11p is provided in the lower end of the outer peripheral side parts 11m1a-11m5a and 11m7a-11m11a of a radial direction rib. The plate-like member 11p has an opening 11pa formed by an opening edge 11pi at the central portion in the radial direction. The plate-like member 11p is formed in a flat plate shape between the opening edge 11pi and the outer periphery 11po, and the lower ends of the outer peripheral portions 11m1a to 11m5a and 11m7a to 11m11a of the radial ribs formed to have a constant height. Is attached. In FIG. 10, the lower surface (rear surface) of the rotary blade 11 ″ between the opening edge 11pi and the outer periphery 11po is shown through the plate-like member 11p.

  The rotary blade 11 '' has a working surface 11l forming a raised portion 11a and a valley portion 11b, an annular portion 11j, a bulging portion 11k, radial ribs 11m1 to 11m12, and a circumferential rib 11n4. It is made from a single piece of material. The through hole 11c, the protrusion 11d, and the bulging portion 11e are also molded at the same time. The plate-like member 11p is made of resin and is attached to the integrally formed rotary blade 11 ''.

  The opening edge 11pi of the plate-like member 11p is located at a substantially central portion of the radius of the rotary blade 11 ''. That is, the radius of the opening edge 11pi is about ½ of the radius of the rotary blade 11 ''. The position (that is, the radius) of the opening edge 11pi may be changed as appropriate in order to obtain an appropriate discharge flow rate. Moreover, although the circumferential rib 11n4 was left and the other circumferential ribs 11n1-11n3 were removed with respect to the rotary blade 11 of an Example, you may remove the circumferential rib 11n4. Alternatively, a plurality of circumferential ribs may be left.

  In this embodiment, instead of the circumferential ribs 11n1 to 11n3 that reinforce the operating surface 11l of the rotary blade 11 '', the plate-like member 11p functions as a reinforcing material.

  When the rotating blade 11 ″ rotates, the washing water at the bottom of the outer tub 10 is sucked up from the radial center of the rotating blade 11 ″, and the sucked washing water is sucked into the lower surface (back surface) of the working surface 11l and the plate-like member 11p. And flows into the water inlets 71a and 81a of the circulating water channels 71b and 81b through the space surrounded by the side surfaces (blade surfaces) of the radial ribs 11m1 to 11m5 and 11m7 to 11m11. That is, the washing water is sucked from the radial center of the rotary blade 11 ″ and discharged from the outer periphery of the rotary blade 11 ″.

  According to this embodiment, the efficiency of the centrifugal pump can be increased, and the flow rate of the washing water fed into the water inlets 71a and 81a of the circulation water channels 71b and 81b can be increased.

  According to each of the embodiments described above, the flow rate of the washing water discharged by the back blades 11m of the rotary blades 11, 11 ', 11' 'constituting the centrifugal pump can be increased. Therefore, the washing water discharged from the discharge port 81c of the circulation water channel 81b of the electric washing machine 100 can be sprinkled over a wide range. Thereby, the cleaning effect can be enhanced.

  Further, in the rotary blades 11, 11 ′, 11 ″ of each embodiment, the raised portion 11a is located above the height position of the annular portion 11j, and the trough portion 11b is the height position of the annular portion 11j. It is located below. In the rotary blades 11, 11 ′, 11 ″, the lower dimension d <b> 1 from the annular portion is larger than the upper dimension h <b> 1. The depth dimension d2 from the annular part 11j in the valley part 11b is larger than the height dimension h1 from the annular part 11j in the raised part 11a. Thereby, the cross-sectional area of the discharge port (back blade 11m formation part) of the centrifugal pump facing the water inlets 71a and 81a of the circulation water channels 71b and 81b can be increased (especially by increasing the height direction dimension). The amount of washing water fed into the circulation water channels 71b and 81b can be increased.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 11 ... Rotary blade, 11m, 11m1-11m12 ... Radial rib (back blade), 11m1a-11m12a ... Outer peripheral part of radial rib, 11n1-11n4 ... Circumferential rib, 11n1o, 11n2o ... Opening, 11p ... Plate shape Element.

Claims (4)

An outer tub for storing water, an inner tub provided inside the outer tub, a rotating blade provided rotatably at the bottom of the inner tub, and a drive device for rotationally driving the rotating blade.
The inner tub has a circulation channel for circulating washing water and sprinkling the washing water from the upper part of the inner tub into the inner tub.
The rotary vane is provided with a plurality of radial ribs provided in the radial direction, sucks up the washing water at the bottom of the outer tub and circulates the washing water in the circulation channel, and is provided adjacent to the circumferential blade. A circumferential rib intersecting two matching radial ribs on the lower surface side of the rotary blade,
The circumferential rib is configured such that a lower end thereof is at least a part in the circumferential direction and is located above a height position of the lower end of the radial rib at a portion where the circumferential rib intersects the radial rib. In an electric washing machine
The rotary blade includes an annular ring part that goes around the outer periphery at the same height position, a raised part that is located above the height position of the annular part, and a height position of the annular part. And also has a trough located below, and a discharge port for washing water by the back blade is configured below the annular portion,
The radial rib has an outer peripheral end facing the water inlet of the circulating water channel, and a lower part of the radial rib at the outer peripheral end and a height interval between the annular part and the lower part of the annular part. rectangular dimensions, sizes rather are formed than is the height direction spacing ring portion upper dimension between the vertices and the annular portion of the raised portion,
A plurality of the circumferential ribs are provided so as to be located at different radial positions,
The depth dimension from the annular part in the valley part is larger than the upper dimension of the annular part, and the radial rib is not provided on the outer peripheral side of the circumferential rib located on the outermost periphery in the valley part. Electric washing machine characterized by In the electric washing machine according to claim 1,
Comprising a plurality of circumferential ribs provided at different radial positions;
Among the plurality of circumferential ribs, the lower end of the circumferential rib located on the outermost side is at least a part of the circumferential direction, and the height of the lower end of the radial rib at a portion where the circumferential rib intersects the radial rib An electric washing machine, which is located above the position. In the electric washing machine according to claim 1 or 2,
The electric washing machine according to claim 1, wherein the radial rib has a shape inclined or curved in the same direction with respect to a radial direction from the rotation center of the rotary blade toward the outer peripheral side. The electric washing machine according to any one of claims 1 to 3,
At the lower end of the radial rib, a plate-like member having an opening at a position facing the lower surface of the central part of the rotary blade is provided,
The electric ring washing machine is characterized in that the lower dimension of the annular portion includes a thickness of the plate-like member.

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