JP3392458B2 - Washing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine used in ordinary households. 2. Description of the Related Art In recent years, agitating blades of a washing machine are flat and large, and are rotated at a low speed in order to create a water flow with less damage to clothes and a water flow with less cloth. Along with the increase in the size of the stirring blade, a reinforcing rib and a pump blade rib for creating a circulating water flow are provided on the back surface.
No. 27 (D06F 17/10). [0003] However, the above-mentioned stirring blades of the washing machine cannot perform a sufficient detergent melting operation, and there is a case where the detergent content remains in a granular form after washing. Specifically, a small amount of water is supplied to the washing tub, detergent is put in, and the stirring blade is rotated at a low speed.Washing water flows from the periphery of the stirring blade into the recess of the washing tub, and is circulated by the pump blade rib. However, in the concave portions and the pump blade ribs of the prior art, strong turbulence for melting the detergent in a short time did not occur, and the detergent remained granular in the laundry after washing. Accordingly, the washing machine of the present invention has solved the above-mentioned problems. According to the present invention, a plurality of main blades are radially provided, radial pump blade ribs are provided on the back surface, and a plurality of reinforcing ribs are provided on appropriate positions on the back surface. A stirring blade having a drainage hole communicating therewith is rotatably mounted in a concave portion of the bottom of the washing tub, and a plurality of communication holes communicating the front and back are formed at approximately a half diameter portion of the main blade,
A lower end of the pump blade rib on the outer peripheral side with respect to a substantially half diameter is protruded below that of each of the reinforcing ribs, and a rectifying rib is provided in the recess at a central portion from the pump blade rib. Are formed radially toward the back surface of. When the stirring blade is rotated to dissolve the detergent, the water and the detergent flowing into the concave portion from the communication hole are rectified in the circumferential direction by the rectifying rib and are sucked by the pump blade rib. At this time, when the water and the detergent are sucked into the pump blade ribs from the outermost end of the straightening ribs, the outermost end of the straightening ribs and the innermost end of the pump blade ribs are agitated in a draining state, and the pump blades are drained. The operation of being discharged into the tank by the ribs and being stirred by the main blade and the auxiliary blade is repeated, and the detergent is melted. Embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a machine frame of a washing machine, and a lower portion of the machine frame 1 is supported by a machine frame 2. Reference numeral 3 denotes a washing tub mounted in the machine frame 1 and formed of resin, and a circular recess 4 is formed at the bottom of the washing tub 3. Reference numeral 5 denotes a bearing fixed to the center of the concave portion 4, and reference numeral 6 denotes a blade shaft projecting from the bearing 5 to the inside and outside of the washing tub 3. Numeral 7 denotes a stirring blade fixed to a blade shaft 6 projecting inward of the washing tub 3 with screws and formed of an amorphous polyolefin resin. The stirring blade 7 is rotatably supported in the recess 4. Reference numeral 8 denotes a rectifying rib formed radially around the bearing 5 fixed to the center of the concave portion 4 so as to protrude upward from the concave portion 4. A plurality are provided with a length of approximately 1/2 diameter of 4. Further, a recess 4 in which a bearing 5 is fixed to the recess 4
An annular bottom reinforcing rib 9 formed in the circumferential direction is
And a plurality of radially formed bottom reinforcing ribs 10 are integrally formed. Reference numeral 11 denotes a washing motor fixed to the machine base 2;
A is a large pulley fixed to the blade shaft 6 protruding downward from the washing tub 3 from the bearing 5, 12B is a small pulley fixed to the shaft of the washing motor 11, and 13 is the pulley 12A. The above-mentioned blade shaft 6 is decelerated by a belt connecting 12B. 3 to 5, the stirring blade 7 will be described in detail. Reference numeral 14 denotes a plurality of main blades formed on the surface of the blade base 7a of the stirring blade 7. The main blades 14 are formed so as to bulge high at the center and radially, and have a diameter approximately half of that of the stirring blade 7. From the vicinity to the outer peripheral end 14a, the height of the main blade 14 is gradually lowered so as to be formed. 15 is approximately 1/2 of the main blade 14
It is a communication hole provided by connecting the front and back to the diameter part,
When the stirring blade 7 rotates, the washing water in the washing tub 3 becomes a suction port for sucking the washing water from the communication hole 15 into the recess 4. 16
Reference numeral denotes an auxiliary blade formed between the main blades 14, and a plurality of auxiliary blades are formed radially on a blade base 7a portion on the outer peripheral side of a substantially half diameter of the stirring blade 7. The height of the auxiliary blade 16 is substantially the same as the height (H) of the outer peripheral end 14a of the main blade 14, and is integrally formed. Reference numeral 17 denotes drain holes provided at a plurality of locations for draining water from the upper surface of the stirring blade 7 to the concave portion 4.
After washing is completed, residual water on the stirring blades 7 is prevented. Reference numeral 18 denotes a plurality of reinforcing ribs formed radially from the blade boss 7b side on the back surface of the stirring blade 7; Reinforcement rib 1
It is a pump blade rib formed higher than the height of 8. The pump blade ribs 19 are formed so as to be continuous with the leading end side of the flow regulating ribs 8 at a small interval. 20 is the impeller 7
A plurality of annular reinforcing ribs formed on the back of
The height of 20 is lower than the height of the pump blade rib 19. The operation will be described based on the above configuration. First, a small amount of water is supplied to the washing tub 3 to supply a detergent, and the stirring blade 7 is rotated for about 2 seconds to perform a detergent melting operation. The stirring blade 7 has a small pulley 12B and a large pulley
The light is transmitted to the blade shaft 6 via the belt 13 suspended on the rim 12A and rotates at a low speed. When the stirring blade 7 rotates, the washing water and the unmelted detergent pass through the communication hole 15 by the pump blade rib 19 and the concave portion 4.
The detergent is dissolved during the repetition of the circulation of being sucked into the inside and being discharged upward from the outer periphery of the stirring blade 7. In the present invention, the following phenomena occur due to the interaction between the flow regulating rib 8 and the pump blade rib 19. That is, when suction is performed from the outermost end of the rectifying rib 8 to the pump blade rib 19, the outermost end of the rectifying rib 8 and the innermost end of the pump blade rib 19 are agitated in a draining state to form a turbulent flow. Thus, the melting of the detergent is promoted. FIG. 6 shows a case where a detergent is melted by the structure of the present invention and a case where a pump blade rib is formed over substantially the entire diameter of the back surface of the stirring blade (there is no communication hole communicating between the front and back surfaces). FIG. 5 is a detergent melting performance diagram comparing the melting state with the case of using the same. In the conventional configuration, even if a circulating water flow is generated, a large amount of washing water is sucked into the recessed portion as in the present invention, and a turbulent flow cannot be formed by the rectifying rib 8 and the pump blade rib 19, so that the effect of melting the detergent is poor. Next, after the detergent is melted, the washing tub 3 is supplied with water to a predetermined washing water level and the washing process is started. The laundry is automatically inverted at a low speed and is stirred by the main blades 14 in the horizontal direction to be washed. Outer end 14a of main blade 14 and auxiliary blade 1
6 works as a washing board, and the action of scrubbing is added to wash. At the same time, a large amount of washing water is sucked from the plurality of communication holes 15 provided in the center portion of the main blade 14 to the back side of the stirring blade 7 and is rectified outward by the rectification rib 8 protruding from the concave portion 4. Further, the washing water is pumped by a pump blade rib 19 into a circulation path (not shown) provided in the washing tub 3 and is discharged into the tub from around the stirring blade 7. During this rotation, when sucked from the rectifying rib 8 by the pump blade rib 19, it is agitated in a draining state as in the detergent melting operation, and turbulence occurs. The action takes place. Therefore, even when a recent compact detergent which is particularly difficult to dissolve is used, the detergent is melted in a short time by the turbulence formed by the rectifying rib 8 and the pump blade rib 19 with a small amount of washing water before the start of washing. The laundry after washing is free of unmelted granular detergent. Furthermore, during the washing operation, even if the pressing force is applied to the stirring blade 7 by the load of the laundry, the reinforcing ribs 18 formed on the back surface of the stirring blade 7 and the back surface of each blade 14
Since the rigidity of the wing base 7a is increased by 20, the wing base 7a is not distorted or deformed by scrubbing or the like. Further, if a non-crystalline polyolefin resin is used as the molding material of the stirring blade 7, the composition of the resin is less likely to be deformed than that of the polypropylene resin. FIG. 7 is a performance graph showing the relationship between "bending elastic modulus and temperature" of a typical resin for forming the stirring blade 7, and comparison is made between three types of resins illustrated in the graph. The permissible temperature for washing with hot water and dissolving the detergent used during washing is 50 ° C to 60 ° C due to the heat resistance of the washing machine and the performance of the detergent. It is in the order of the conventionally used polypropylene resin. However, the heat-resistant ABS resin has a problem in terms of durability against chemicals (deterioration due to the effect of a detergent), and has a problem in that the material cost is high. In addition, conventionally used polypropylene resins have good durability against chemicals and low material costs, but have low allowable heat resistance. Therefore, unless the permissible operating temperature of the washing machine is reduced to at least 45 ° C. or less, thermal deformation is likely to occur. If the allowable temperature is not lowered, the agitating blade 7 is easily deformed and the cleaning performance becomes a problem. Therefore, a polyolefin resin which has good durability against chemicals and is hardly deformed is suitable. The deformation of the stirring blade due to the load can be prevented. According to the present invention, since the washing water is caused to flow between the bottom surface of the concave portion and the back surface of the stirring blade to form a turbulent flow, the detergent can be melted in a short time. Therefore, no granular detergent residue remains in the laundry after washing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged view of a main part of a washing machine of the present invention. FIG. 2 is an enlarged view of a main part of the recess. FIG. 3 is a plan view of the stirring blade. FIG. 4 is a back view of the stirring blade. FIG. 5 is a side sectional view of the stirring blade. FIG. 6 is a performance comparison chart showing the melting rate of the detergent. FIG. 7 is a performance graph of a flexural modulus of a resin material. [Description of Signs] 3 Washing tub 4 Depression 7 Stirring blade 8 Straightening rib 14 Main blade 15 Communication hole 16 Auxiliary blade 18 Reinforcement rib 19 Pump blade rib 20 Reinforcement rib

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D06F 17/00 D06F 17/10 D06F 39/02

Claims (1)

(57) [Claims 1] A plurality of main blades are radially provided on the front surface, radial pump blade ribs are provided on the back surface, and a plurality of reinforcing ribs are provided on appropriate positions on the back surface. A stirring blade having a drainage hole communicating therewith is rotatably mounted in a concave portion of the bottom of the washing tub, and a plurality of communication holes communicating between the front and back are formed at a substantially 1/2 diameter portion of the main blade, The lower end of the pump blade rib on the outer peripheral side with respect to approximately 1/2 diameter is made to protrude below that of each of the reinforcing ribs, and a rectifying rib is provided in the recess at the center of the pump blade rib. A washing machine characterized in that a plurality of them are formed radially toward the back surface.