JP3063478B2 - Washing and dewatering tub - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing and dewatering tub made of different materials such as resin and metal.

[0002]

2. Description of the Related Art Conventionally, the washing and dewatering tub of a fully automatic washing machine has been mostly of an integral type made of resin, but recently, the number of cases where the washing and dewatering tub is made of metal has increased.

Conventionally, this type of fully automatic washing machine using a stainless steel washing and dewatering tub has been configured as shown in FIG. Hereinafter, the configuration will be described.

[0004] As shown in the figure, a washing and dewatering tub 1 has a stirring blade 2 rotatably arranged on the bottom surface and a mounting flange 3 on the back surface of the bottom surface. A water receiving tub 4 is provided outside the washing and dewatering tub 1. A drive motor 5 for driving the washing / dewatering tub 1 and the stirring blade 2 is attached to the back surface of the water receiving tub 4. The water receiving tank 4 is supported on the outer frame 6 by a suspension 7 so as to prevent vibration. A fluid balancer 8 containing a liquid is fixed to an upper portion of the washing and spin-drying tub 1. A substantially U-shaped water passage 9 is fitted to the side surface of the washing and dewatering tub 1 to form a circulating water passage. The water passes through the circulation channel formed by the water tub 1, reaches the fluid balancer 8, and is discharged from the opening 10 of the water passage 9 into the washing and dewatering tub 1. In addition, 11 is a lint filter.

As shown in FIG. 9, the washing and dewatering tub 1 is formed of a body 1a and a bottom 1b of the washing and dewatering tub.
Is generally about 0.6 mm in thickness, and the bottom 1b is generally about 1.2 mm in thickness for securing strength. For this reason, the cross section of the corner 1c has a radius of about 2 mm due to processing problems, and the crimping of the joint 1d between the body 1a and the bottom 1b is generally used.

[0006]

In such a conventional washing and dewatering tub, the thermal expansion coefficients of the resin and the metal are greatly different under the current situation where the stirring blade 2 is formed of a resin (the thermal expansion coefficient of the metal is 8 × 10 4). ^-6 mm / ° C, resin is 100 × 10 ^-6
(mm / ° C.), as shown in FIG. 9 due to a change in outside air temperature and a dimensional difference due to a difference in thermal expansion coefficient between the stirring blade 2 when using hot water for washing and the vicinity of the stirring blade 2 of the washing and dewatering tub 1. In the gap A, the operation becomes impossible due to the friction between the stirring blade 2 and the periphery of the washing and dewatering tub 1, and the gap A in the peripheral portion becomes large due to use at a low water temperature in winter. Foreign matter such as coins and hair-pins are discharged and flow out to the drain valve portion, which causes problems such as inducing water leakage at the drain valve portion.

Further, the corner portion 1c, since the curvature of radius of about 2 mm from the processing problems, and dropped from the gap A between the foreign matter stirring blade 2 and the corner portion 1c of such coins described above, the drainage valve unit To drain and cause abnormal drainage. In addition, the joining portion 1d between the body portion 1a and the bottom portion 1a has a large difference in plate thickness, so that the joining is unstable, and crevice corrosion occurs due to generation of minute gaps.

The present invention has been made to solve the above-mentioned problems, and makes the gap between the washing and dewatering tub, the stirring blade, and the temperature uniform regardless of the temperature.
The first is to prevent foreign objects such as coins from falling from the gap.
The purpose is.

It is a second object of the present invention to securely fasten a metal tubular body constituting a washing and dewatering tub to a lower inner tub so as to eliminate a problem such as crevice corrosion of a fastening portion.

It is a third object of the present invention to improve the accuracy of attaching the cylindrical body to the lower inner tank and reduce vibration and noise during dehydration.

It is a fourth object of the present invention to improve the mounting accuracy and strength of the upper part of the cylindrical body and the fluid balancer.

It is a fifth object of the present invention to securely tightly support a plurality of water passages between an upper fluid balancer and a lower inner tank.

[0013]

In order to achieve the first object, the present invention provides a metal cylindrical body having a plurality of holes formed in a side wall, and an upper part of the cylindrical body. Tree stuck to the periphery
Fat made fluid balancer - and the lower inner tank made of a bottomed resin which is fixed downward the tube-shaped body portion, disposed in said lower inner tank
A first problem solving means is to provide a stirring blade made of resin .

In order to achieve the second object, a convex portion is formed on the outer periphery of the lower side of the cylindrical body of the first means for solving the problem, and an upper flange is formed on a side wall of the lower inner tank. And a lower flange portion, the upper surface of the upper flange portion is brought into contact with the convex portion of the cylindrical body portion, and the lower end portion of the cylindrical body portion is folded and fixed to the lower surface of the lower flange portion. This is defined as the second problem solving means.

In order to achieve a third object, a plurality of inwardly projecting cuts are provided between the convex portion and the lower bent portion of the cylindrical body of the first or second means for solving the problems. A third problem-solving means is to provide a raised portion and engage the cut-and-raised portion with a notch provided in a side wall of the lower inner tank.

In order to achieve the fourth object, the first problem solving means is that the peripheral edge of the upper end of the cylindrical body is bent into a circular cross section, and is fixed to the step of the fluid balancer. 4 means for solving the problem.

Further, in order to achieve the fifth object, the flow
Ascends along the inner tank wall between the body balancer and the lower inner tank
A fifth problem-solving means is that a water channel is provided, and the water channel is fixed by sandwiching a water channel forming member between a fluid balancer and a lower inner tank.

[0018]

According to the first aspect of the present invention, there is provided:
The coefficient of thermal expansion of the lower inner tank made of resin with a bottom fixed to the bottom of the cylindrical body and the stirring blade can be matched, and even if the temperature fluctuates due to changes in the outside air temperature or when using hot water during washing. The gap between the lower inner tank and the stirring blade does not change,
Foreign substances such as coins and hair pins are not discharged from the gap.

According to the second means for solving the problem, the strength of the cylindrical body can be improved by forming a convex portion inwardly on the outer periphery on the lower side of the cylindrical body. The upper surface of the flange is brought into contact with the protrusion of the cylindrical body, and the lower end of the cylindrical body is folded and fixed to the lower surface of the lower flange, thereby fastening the cylindrical body to the lower inner tank. Can be strengthened.

According to the third means for solving the problem, a plurality of inwardly protruding portions are provided on the side wall of the lower inner tank between the convex portion of the cylindrical body and the lower bent portion. By engaging the notch, the cylindrical body and the lower inner tub can be securely mounted, and the center of the cylindrical body and the center of the lower water tub can be accurately positioned.

Further, by bending the outer periphery of the upper edge of the cylindrical body into a circular cross section, the strength of the upper edge of the cylindrical body can be improved, and the cylindrical body can be improved. The height between the upper end and the convex portion of the cylindrical body can be adjusted at the circular cross section, and accurate dimensions can be obtained.

According to a fifth aspect of the present invention, a fluid bath is provided.
Ascends along the inner tank wall between the lancer and the lower inner tank
A water passage is provided, and the water passage can be watertightly and firmly fastened by fixing the water passage forming member between the fluid balancer and the lower inner tank.

[0023]

An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the cylindrical body 12 is formed of a metal plate such as a stainless steel plate, and has a plurality of holes 1 on its side wall.
3 is formed. The fluid balancer 14 includes the cylindrical body 1.
2 is fixed to the upper peripheral edge. The bottomed inner tank 15 having a bottom is formed of a resin, is fixed below the cylindrical body 12, and has a recess 16 in which an agitating blade (not shown) is provided in the inner bottom. The water passage 17 is formed in a tubular shape, is in contact with the side wall of the tubular body 12, and is provided between the fluid balancer 14 and the lower inner tank 15. A lower fluid balancer 18 is integrally formed outside the bottom of the lower inner tank 15.

With this configuration, the stirring blade is rotatably disposed in the recess 16, and the rotation of the stirring blade causes the water on the back surface of the stirring blade to pass through the water passage 17, reach the fluid balancer 14, and open the water passage 17. It is discharged from the unit 19. On the other hand, since the lower inner tub 15 and the stirring blade fixed below the cylindrical body 12 are both formed of resin, their thermal expansion coefficients can be matched to each other, so that the outside air temperature changes and hot water is washed during washing. Even when the temperature fluctuates, for example, during use, the gap between the lower inner tank 15 and the stirring blade does not change, and foreign matters such as coins and hair pins are not discharged from the gap.

Next, as shown in FIG.
A convex portion 20 is formed inward on the outer periphery on the lower side of the lower inner tank 1.
The upper flange portion 22 and the lower flange portion 23 are formed on the side wall 21 of the fifth cylindrical member 5, and the upper surface of the upper flange portion 22 is brought into contact with the convex portion 20 of the cylindrical body portion 12 after being inserted, and the lower end portion of the cylindrical body portion 12 is contacted. Is bent and fixed to the lower surface of the lower flange portion 23 to form a bent portion 24. Further, the upper flange portion 22 and the lower flange portion 23 of the lower inner tank 15 are provided.
Boss 26 projecting from side wall 21 with mounting bolt 25
It is fixed to.

With this configuration, the strength of the cylindrical body 12 can be improved by the convex portion 20 formed inward on the outer periphery on the lower side of the cylindrical body 12, and the upper flange of the side wall 21. The upper surface of the cylindrical body 12 is brought into contact with the protruding portion 20 of the cylindrical body 12, and the lower end of the cylindrical body 12 is folded and fixed to the lower surface of the lower flange 23 so that the cylindrical body 12 and the lower inner portion are fixed. Fastening with the tank 15 can be strengthened, and problems such as crevice corrosion at the fastening portion can be eliminated.

Next, as shown in FIG.
A plurality of inwardly protruding portions 27 are provided between the protruding portion 20 and the lower bent portion 24, and cutout portions (not shown) are formed in the side walls of the lower inner tank 15 corresponding to the incision and protruding portions 27. And the cut-and-raised portion 27 is engaged with the cut-out portion.

With this configuration, the cylindrical body 12 and the lower inner tank 15 can be securely attached to each other, so that the center of the cylindrical body 12 and the center of the lower water tank 15 can be accurately positioned. The eccentricity between the portion 12 and the lower inner tank 15 can be improved, and the cut-and-raised portion 27 can also serve as a detent.

Next, as shown in FIG.
Is bent into a circular cross section to form a fluid balancer.
Fourteen step portions 29 are brought into contact with each other. Further, the tubular body 12 and the fluid balancer 14 are fixed to the lower part of the upper peripheral edge 28 with mounting bolts 30. In addition, water passage 17
Are fitted and fixed to the fluid balancer 14 by a water passage cover 31.

In order to reduce the vibration during the spinning of the washing and dewatering tub, it is necessary to improve the eccentricity with respect to the center of the washing and dewatering tub. It is necessary to obtain a degree of parallelism between the contact surface of the water tank 15 with the upper flange 22 and the upper peripheral edge 28 of the tubular body 12. Therefore, when the upper end peripheral edge 28 is processed into a circular cross section, it is processed so as to have a degree of parallelism.

With this configuration, the strength of the upper peripheral edge 28 of the cylindrical body 12 can be improved, and the size of the upper end of the cylindrical body 12 and the projection 20 of the cylindrical body 12 can be increased by the circular cross section. Adjustment can be performed, accurate dimensions can be obtained, and vibration during spin-drying can be reduced.

Next, as shown in FIGS. 5 and 6, the water passage 17 is formed by welding and integrating a water passage cover 32 and a water passage guide 33, and has a substantially elliptical cross section. As shown in FIG. 7, an inverted L-shaped rib body 34 and a claw portion 35 are provided on the back surface of the waterway guide 33, and the cylindrical body 12
Of the water passage 17 is prevented from rising inward. Claw part 3
The position 5 is provided below the water passage 17. The claw portion 35 is engaged with the square hole 37 on the upper surface, and once locked, the portion of the water passage 17 below the claw portion 35 is restricted from moving upward.

A pin 38 projects downward from the lower part of the water passage 17 and is fitted into the lower inner tank 15. The upper end of the water passage 17 has an upwardly projecting rib 39 whose insertion position is regulated in the concave portion of the fluid balancer 14, and the rib 39 prevents the rib 39 from falling inward. However, a gap is provided between the two in the vertical direction. The small hole 41 provided on the upper part of the rib body 34 is used to
When the water passage 17 is attached to the cylindrical body 12, the water passage 17 comes to the position of the square hole 36. In addition, rib bodies 43 and 44 are provided inside the respective welding surfaces 42 of the waterway cover 32 and the waterway guide 33 so as to cover the welding surface 42, and it is possible to prevent lint or the like of clothes from being caught by burrs generated during welding. I'm preventing.

With this configuration, the water passage 17 can be fastened tightly and tightly between the lower inner tank 15 and the upper fluid balancer 14, and even if hot water is used, the resin water passage 17 does not extend. The portion below the portion 35 is less affected and absorbs between the fluid balancer 14 and the rib body 39,
The use of the washing machine is not hindered. If such a measure is not taken, the water passage 17 is deformed and the circulating discharge amount is reduced, a gap is formed between the cylindrical body 12 and a button of clothing is hooked, or the lower inner tank 15 is There is a possibility that a step may be generated between them and the clothes may be damaged, or the water passage 17 may be detached.

[0036]

As is apparent from the above, according to the present invention, a metal tubular body having a plurality of holes formed in a side wall, and a resin tubular body fixed to an upper peripheral edge of the tubular body . A lower inner tank made of a resin with a bottom fixed to the lower part of the cylindrical body, and a resin agitator disposed in the lower inner tank.
By having the blades , the lower inner tank is made of resin having the same coefficient of thermal expansion as the stirring blade, so that the gap between the stirring blades and the lower inner tank on the periphery can be made uniform regardless of the temperature, Foreign matter such as coins falling from the gap can be prevented from falling. Also, by using a resin for the lower inner tank, there is an effect that the lower fluid balancer can be integrally formed. In addition, by making the lower inner tank a resin rather than a metal, it is possible to reduce the weight and to significantly reduce the unit cost.

Further, a convex portion is formed inward on the outer periphery on the lower side of the cylindrical body portion, an upper flange portion and a lower flange portion are formed on the side wall of the lower inner tank, and the upper surface of the upper flange portion is formed on the upper side. Since the lower end portion of the cylindrical body portion was folded and fixed to the lower surface of the lower flange portion so as to abut against the convex portion of the cylindrical body portion, the convex portion inward was formed on the outer periphery on the lower side of the cylindrical body portion. By forming the cylindrical body, the strength of the cylindrical body can be improved, and the upper surface of the upper flange is brought into contact with the projection of the cylindrical body, and the lower end of the cylindrical body is connected to the lower flange. By being folded and fixed to the lower surface of the cylindrical body, the fastening between the cylindrical body portion and the lower inner tank can be strengthened, and problems such as crevice corrosion of the fastening portion can be eliminated.

A plurality of inwardly projecting portions are provided between the convex portion of the cylindrical body portion and the lower bent portion, and the notch portions are provided on the side wall of the lower inner tank. Since it is engaged with the section, the eccentricity of the lower inner tank and the cylindrical body can be improved, and vibration and noise during dehydration can be reduced.

Further, since the upper peripheral edge of the cylindrical body is bent into a circular cross section and fixed to the step of the fluid balancer, the strength of the upper peripheral edge of the cylindrical body can be improved, and the cylindrical body can be improved. The parallelism between the convex portion and the upper edge can be improved, and the eccentricity of the upper fluid balancer and the runout accuracy are improved.
Vibration and noise during dehydration operation can be reduced.

Further, between the fluid balancer and the lower inner tank
A water passage that rises along the inner tank wall surface, and the water passage
Means that a plurality of water passages are connected to an upper fluid balancer by fixing a water passage forming member between a fluid balancer and a lower inner tank.
And the lower water tank can securely support tightly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a washing and dewatering tub according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a fixed state of a cylindrical body portion and a lower inner tub of the washing and dewatering tub.

FIG. 3 is a partially cutaway perspective view of a main part of a cylindrical body of the washing and dewatering tub.

FIG. 4 is a cross-sectional view showing a fixed state of a cylindrical body of the washing and dewatering tub and a fluid balancer.

FIG. 5 is an exploded perspective view of a water passage of the washing and dewatering tub.

FIG. 6 is a sectional view of a water passage of the washing and dewatering tub.

FIG. 7 is a partially cutaway rear perspective view of a water passage of the washing and dewatering tub.

FIG. 8 is a sectional view of a washing machine having a conventional washing and dewatering tub.

FIG. 9 is a partial cross-sectional view of a lower portion of the washing and dewatering tub.

[Explanation of symbols]

 12 tubular body 13 hole 14 fluid balancer 15 lower inner tank 17 water passage

Continuation of the front page (56) References JP-A-4-197291 (JP, A) JP-A-63-281695 (JP, A) JP-A-7-59987 (JP, A) JP-A-5-3994 (JP) JP-A-7-31790 (JP, A) JP-A-7-24179 (JP, A) JP-A-3-162896 (JP, A) JP-A-3-284290 (JP, A) 60-148592 (JP, A) JP-A-7-148388 (JP, A) JP-A-59-22687 (JP, U) Patent 2691068 (JP, B2) JP-B-7-4466 (JP, B2) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) D06F 39/12

Claims (5)

(57) [Claims] 1. A metal cylindrical body having a plurality of holes formed in a side wall, and a resin body fixed to an upper peripheral edge of the cylindrical body .
A fluid balancer, a lower inner tank made of a bottomed resin fixed below the cylindrical body, and a resin disposed in the lower inner tank.
Washing and dewatering tub with stirring blades made of stainless steel . 2. An inwardly projecting portion is formed on an outer periphery of a lower side of a cylindrical body portion, and an upper flange portion and a lower flange portion are formed on a side wall of a lower inner tank. The washing and dewatering tub according to claim 1, wherein the lower end portion of the cylindrical body portion is abutted on a convex portion of the cylindrical body portion, and a lower end portion of the cylindrical body portion is folded and fixed to a lower surface of the lower flange portion. 3. A notch in which a plurality of inwardly projecting portions are provided between the convex portion of the cylindrical body and the lower bent portion, and the inwardly projecting portions are provided on a side wall of the lower inner tank. Claim 1 engaged with the portion
Or the washing and dewatering tub of 2. 4. The washing and dewatering tub according to claim 1, wherein the peripheral edge of the upper end of the cylindrical body is bent into a circular cross section, and fixed to a step of the fluid balancer. 5. An inner tank between a fluid balancer and a lower inner tank.
A water passage that rises along the wall surface is provided, and the water passage is provided with water.
2. The washing and dewatering tub according to claim 1, wherein the path forming member is sandwiched and fixed between the fluid balancer and the lower inner tub.