JP3141742B2 - Fully automatic washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic washing machine capable of eliminating washing unevenness and improving washing power by allowing washing water to sufficiently penetrate into washings floating on the washing water surface. .

[0002]

2. Description of the Related Art In order to improve the washing power of an electric washing machine,
As described in JP-A-7-8680, a washing machine provided with a plurality of means for circulating washing water is known. This is provided with a plurality of washing water circulation paths (hereinafter simply referred to as circulation paths) on the wall of a washing and dewatering tub (hereinafter simply referred to as a washing tub), and is discharged from a back blade centrifugal pump of a rotating blade provided at a lower portion of the washing tub. The washing water is received at the respective water introduction openings, guided to the upper portion of the washing tub, and fountained widely from the discharge opening at the upper portion of the washing tub. Then, apply the washing water to the laundry that has emerged on the surface of the washing water to promote the penetration of the washing water into the laundry,
It improves the detergency.

Further, there is known a washing machine in which four circulation paths are provided on the wall surface of a washing tub as shown in FIG. FIG. 3A is a vertical sectional side view of the washing tub,
FIG. 2B is a cross-sectional view taken along the line JJ of FIG. A return hole 106 is provided on the wall surface of the washing tub 102 housed inside the outer tub 101 which is a water receiving tub,
Four circulation paths 103a, 103b, 103c, 103d
Two of which 103a and 103b guide the washing water to the upper part of the washing tub as described above, and discharge outlets 104a and 1b.
04b (not shown) is discharged onto the washing water surface. One of the discharge openings 104a is provided with a lint collecting net 105, where the discharge water force is weakened.
b. The other two tubes 103c and 103d squirt the washing water upward from the discharge openings 104c and 104d near the bottom of the washing tub. FIG. 4C schematically shows the discharge openings 104c and 104d. This is because when the washing water is filled above the discharge openings 104c and 104d, the washing water spouting upward from the discharge openings generates a water flow in the washing tub, thereby promoting the movement of the laundry in the washing water. Installed for the purpose of As a result, the cleaning power is improved by increasing the friction between the cloth and the cloth or the friction between the cloth and the blade.

[0004]

In the washing machine described in Japanese Patent Application Laid-Open No. 7-8680, when the washing water is filled up to near the upper portion of the washing tub, the discharge opening at the upper portion of the washing tub is provided. Fountains from widely. However, when the washing water is filled only below the middle height of the washing tub, or when the water level becomes extremely low, the return hole opened in the washing tub (returns the washing water to the back blade) The washing water flow from the washing tub to the outer tub and between the outer tub and the washing tub is less than the flow rate by the back blade pump. Wash water between the tub and the washing tub is insufficient, and a sufficient circulation flow rate cannot be obtained, the amount of water and the water pressure from the discharge opening are reduced, and the discharge cannot be performed in the worst case. Therefore, there is a problem that the effect obtained at a high water level cannot be expected.

In the washing machine shown in FIG. 38, when the water level is high, water is widely sprayed from the discharge opening 104b at the top of the washing tub. You can call. Also, the washing water spouting upward from the discharge openings 104c and 104d below the water surface generates a water flow in the washing tub, thereby promoting the movement of the laundry in the washing water, and friction between cloth and cloth or cloth and blades. Friction increases.

However, the water level of the washing water is
If the height is lower than c and 104d, since the discharge openings are directed upward, the discharged washing water does not cover the entire laundry, and the effect of promoting the wetting of the laundry is small. Also, in this case, since the number of return holes 106 on the wall of the washing tub 102 is extremely small, the flow rate of the washing water returning from the washing tub 102 to between the outer tub 101 and the washing tub 102 is smaller than the flow rate by the pump of the back blade, If the reversal of the rotor is repeated, the washing water between the outer tub and the washing tub runs short, and a sufficient circulation flow rate cannot be obtained.
The discharge openings 1 as well as the discharge openings 104a and 104b
There is a problem that the amount and pressure of water discharged from the nozzles 04c and 104d decrease.

Further, since the four circulation paths are not arranged point-symmetrically with respect to the rotation axis of the washing tub, there is a fixed imbalance in the washing tub 102, and the washing tub swings greatly during dehydration, and There is also a problem that the collision and the start of dehydration are stopped, and the probability of generating abnormal noise increases.

However, in these washing machines, means for solving this problem is not disclosed.

According to the present invention, the washing water spouting from the discharge opening is applied to the upper surface of the laundry floating on the water surface to promote the penetration of the washing water into the laundry, and the cloth movement in the washing water at a high water level. Washing water is spouted at low and extremely low water levels to prevent washing water from permeating and lifting up the laundry.
A first object is to provide a washing machine that stabilizes rotation start .

[0010] It is a second object of the present invention to provide a washing machine in which washing water is spouted sufficiently so as to splash on laundry, regardless of a high water level, a low water level, and an extremely low water level.

It is a third object of the present invention to provide a washing machine which stabilizes the rotation start of the washing tub during dehydration so that the circulation path installed in the washing tub does not become unbalanced.

[0012]

In order to achieve the first object, according to the present invention, a washing and dewatering tub accommodated in a water receiving tub and a washing and dewatering tub are rotatably disposed on an inner bottom portion thereof. a rotating blade, and back vanes same rotation and rotor blades on the rear surface of the rotor blades, the back
Washing from the water opening and water opening around the blade
A water conduit that extends upward along the inner wall of the dewatering tank
First flow path forming means having the first flow path forming means
Channel form with a headrace extending to a lower position than
And a driving device for inverting and rotating the rotor,
Wherein Ru is provided a downward discharge opening from the horizontal above the first and second flow path forming unit. At this time,
On the side, there is a room to fill the fluid so as to surround the back blade
Attach the balancer that has
Portion of the first and second flow path forming means constituting the headrace
The cross-sectional area in the direction transverse to the circumferential direction of the room
To make the room communicate all around.

At this time, the water channel of the second channel forming means is higher than 1/4 of the rated water level of the washing and dewatering tub to a position lower than the water channel of the first channel forming means. Make it stretch
Good.

Alternatively, the headrace of the second passage forming means may be higher than one-fourth the height of the headrace of the first flow passage forming means to a position lower than the headrace of the first flow passage forming means. extend
It is good to do it.

In order to achieve the second object, in the above-described fully automatic washing machine, if the area of the water introduction opening of the first flow path forming means and the area of the water introduction opening of the second flow path forming means are different. Let

[0016] Alternatively, of the first flow path forming means, a flow path forming means provided with a collecting net at the discharge opening is provided, and the area of the water guiding opening and the water guiding opening of the other flow path forming means is reduced. Different.

Alternatively, a return hole for washing water is provided on the side surface of the washing and dewatering tub, preferably also on the bottom surface, and the return hole on the side surface is provided with a second return hole.
Are densely provided at a position lower than a position higher than the flow path forming means.

[0018] or, between the inner wall and the balancer of the washing濯兼de-water tank, providing a return passage of the washing water.

[0019]

In order to achieve the third object, two first flow path forming means are opposed to each other, and two second flow path forming means are also opposed to each other. And a fully automatic washing machine.

[0021]

Incidentally, the channel forming means is specifically a cover. Further, the discharge opening downward from the horizontal is an opening attached so that the washing water is ejected below the horizontal. In addition, the rated water level is the water level when the rated amount of laundry of the washing machine is thrown, and the diameter or radius of the washing tub and the bath ratio (the amount of water used for 1 kg of laundry (kg)).
Can be determined by

[0023]

[Function] The rotating blades rotate and the back blades rotate together, and the washing water in the washing tub passes through the gap between the outer tub and the washing tub from the return hole and is sucked into the back blades. It is pushed out and enters the circulation channel from each water opening,
Spouts from each discharge opening into the washing tub. In the case of high water level, the fountain is sprayed widely from the discharge opening at the top of the washing tub. Promote and improve detergency. Further, the washing water spouts downward from the horizontal from the discharge opening of the second flow path forming means submerged in the washing water. This creates a water flow in the washing tub that directs the laundry downwards, i.e., toward the rotor. The laundry is pushed by the water flow and touches the rotating wings. The rotation causes the laundry to be twisted and gathered at the central portion, and sequentially move on the washing water surface. In other words, the movement of the laundry in the washing water is promoted to move up and down on the rotary blade axis and downward and upside down along the wall surface of the washing and dewatering tub, and during this movement, the friction between the cloth and the cloth or The detergency is improved by increasing the friction of the blades.

In addition, even in the case of a low water level, there is a sufficient return hole below the surface of the washing water, and the washing water squirted into the washing tub returns immediately between the outer tub and the washing tub through the return hole. There was no shortage of washing water to be supplied to the back blade pump, the amount of circulating water did not decrease, and water was sprayed over a wide area from the discharge opening of the second flow path forming means in the center of the washing tub. A large amount of washing water can be applied to the laundry. Further, although the water force is lower from the upper side, that is, the discharge opening of the first flow path forming means, than the lower side, that is, the discharge opening of the second flow path forming means, the washing water is jetted downward from the horizontal. In other words, the washing water falls on the laundry floating on the washing water surface like a two-stage waterfall, and promotes the penetration of the washing water into the laundry, thereby improving the washing power.

At this time, by making the area of the water introduction opening of the first flow path forming means larger than that of the second flow path forming means, the water force from the discharge port can be made the same. .

Also, a back blade is provided inside the washing and dehydrating tub.
A balancer having a chamber for enclosing the fluid so as to surround the
By attaching, the balun can be installed from inside the washing and dewatering tub.
And the first and second flow path forming means can be assembled.
The assembly work is simplified. For this, the balancer
The headraces of the first and second flow passage forming means in the circumferential direction are
In the part that is constructed,
Let the room communicate all around so that the cross-sectional area is reduced
To do.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional side view showing a first embodiment of a fully automatic washing machine according to the present invention. The exterior is composed of an outer frame 1 and a lid 2 which is hinged to the upper edge so as to be openable and closable. The outer tank 3, which is a water receiving tank, has a tank cover 3b on its upper edge.
Which is suspended from the upper four corners of the outer frame 1 by the hanging rods 4b via the buffer members 4a in the outer frame 1, and is provided with washing water in the washing process and rinsing water in the rinsing process (hereinafter referred to as washing). (Called water).

The washing and dewatering tub 5 installed inside the outer tub 3
A rotating blade 6 is provided at the center of the washing tub (hereinafter, referred to as a washing tub), and a plurality of back blades 6 a rotating in the same direction as the rotating blade 6 are provided on the back side of the rotating blade 6. A large number of dewatering holes and washing water return holes (hereinafter simply referred to as return holes) 27 are formed in the side wall surface, and the density is higher at the lower portion. Return hole 27
Discharges water separated from the laundry to the outer tub 3 by centrifugal force due to high-speed rotation of the washing tub 5 during dehydration. It is also a return hole for returning the washing water in the washing tub 5 to the back blade 6a as described later.

An upper balancer 16 is mounted on the upper edge of the washing tub 5. The upper balancer 16 fills the fluid in the partitioned room and reduces the runout of the washing tub 5 during high-speed dehydration. A hub 7 is joined to the outer surface of the bottom wall of the washing tub 5, and the hub 7 has a water inlet 24.

A drive motor 11 mounted on a drive base 10 installed outside the bottom wall of the outer tub 3 is connected by a belt 13 to a transmission 12 having a combination of a gear reduction mechanism and a clutch mechanism. The output shaft of the transmission 12 is a double concentric output shaft 6c, 6d, which penetrates the bottom wall of the outer tub 3 in a watertight manner and protrudes into the outer tub 3. The output shaft 6c is provided with a rotary blade 6 by a screw 6b. Mounted, the output shaft 6d is connected to the hub 7. The transmission 12 rotates the rotor 6 forward and reverse at 100 to 200 rpm during the washing and rinsing steps, and moves the washing tub 5 joined to the hub 7 between 700 and 1100 during the dewatering step.
Spin at high speed at rpm.

Inside the upper part of the outer frame 1, there are a water supply port 18a, a water supply valve 18, and a control device 19. The control device 19 is provided with a switch for selecting a water level, a washing time, a washing course, and the like.

A hose from a tap is connected to the water supply port 18a. Water from the tap is supplied from the water supply port 18a to the control device 1
Water is supplied to the washing tub 5 via a water supply valve 18 which is opened and closed at 9. A drain port 3a formed in the bottom wall of the outer tub 3 is connected to a drain hose 15 via a drain valve 14 to form a drain system. A water level sensor air chamber 17a is attached below the outer wall of the outer tub 3, and is connected to the water level sensor 17b by a tube 17c. The water level sensor 17b detects the water level of the washing water. Washing water circulation paths 21c and 21d are provided on the inner peripheral side wall surface of the washing tub 5, and are formed by the inner peripheral side wall surface of the washing tub 5 and the covers 20c and 20d. 20a is a similar cover and has a washing water circulation path inside. Each cover has a discharge opening 25a for spouting the washing water 8,
There are 25c and 25d.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. The bottom of the washing tub 5 is provided with a bottom surface dehydration hole and a washing water return hole (hereinafter simply referred to as a bottom surface return hole) 28.
Washing water circulation paths 21a, 21 are provided on the inner peripheral side wall surface of the washing tub 5.
b, 21c, and 21d.
a and 21b face each other, 21c and 21d face each other, 21a
And 21c are provided at an angle of 90 degrees. The washing water circulation paths 21a, 21b, 21c, 21d are formed by the inner peripheral side wall surface of the washing tub 5 and the covers 20a, 20b, 20c, 20d. Reference numerals 22a, 22b, 22c, and 22d are water introduction openings. In the following description, 20b or the like which is invisible due to the sectional view may be described.

FIG. 3 is a vertical sectional side view taken along line BB in FIG. 2, and FIG. 4 is a vertical sectional side view taken along line CC in FIG. The covers 20a, 20b, 20c, and 20d form circulation paths 21a, 21b, 21c, and 21d with the inner peripheral side wall surface of the washing tub 5. The water introduction openings 22a, 22b, 22c, 22d of the water passages 39a, 39b, 39c, 39d open largely toward the outlet of the back blade 6a.

At the time of washing, the washing water returns from the return hole 27 and the bottom return hole 28 to the back blade 6a as shown by the arrow, and is pushed outward by the centrifugal pump action by the rotation of the back blade 6a, and the water introduction opening 22a, From 22b, 22c, 22d, the water flows into the washing water circulation paths 21a, 21b, 21c, 21d via the water conveyance paths 39a, 39b, 39c, 39d.

FIG. 5 is an elevation view of the cover 20a, FIG. 6 is an elevation view of the cover 20b, and FIG. 7 is an elevation view of the covers 20c and 20d. The covers 20a and 20b have a height up to the upper part of the wall of the washing tub (below the upper balancer 16).
Water guide openings 22a, 22b are provided at the lower portion of the lower blades 0a, 20b so as to face the outer periphery of the back blade 6a.
b is provided toward the inside of the washing tub 5. A lint collecting net 36 is provided in the discharge opening 25b. The frame 37 of the collecting net 36 is inserted and attached to the groove 38 of the discharge opening 25b. The covers 20c and 20d have a height halfway along the wall of the washing tub, and the covers 20c and 20d
d, a water introduction opening 2 facing the outer periphery of the back blade 6a.
2c and 22d, and the discharge opening 25 at the top of the cover.
c, 25 d are provided toward the inside of the washing tub 5.
In addition, the headrace upper wall surface 35a formed integrally with the cover,
35b, 35c, 35d and headrace side walls 34a, 34
A headrace is formed by b, 34c, 34d and the bottom wall of the washing tub.

FIGS. 8A and 8B are cross-sectional views of the internal shape of the discharge opening 25a along the lines KK and LL in FIG. The flow of the circulating washing water is bent downward immediately before the discharge opening 25a as shown in the cross-sectional view, and is spread right and left in the horizontal direction. As a result, the washing water falls in a fan-shaped manner spreading right and left downward. The discharge opening 25c,
25d is similarly configured.

FIG. 9 is a top view of the bottom of the washing tub 5 with the rotor and cover removed. 40a, 4 in the figure
Reference numerals 0b, 40c, and 40d denote walls where the outside of the side wall of the headrace channel of the cover constituting the circulation path is joined, 41a, 41b, 41c, and 41c.
Reference numeral 41d denotes a washing tub bottom surface which forms a water guide channel by combining the water guide channel upper wall surface and the water guide channel side wall.

FIG. 10 is a block diagram of the control unit. The configuration of the control device 19 and a water supply valve 18, a drain valve 14, a drive motor 11, a cloth amount sensor 71, and a water level sensor 1 described later.
7b shows an electrical connection block diagram with 7b. The control device 19 is operated by the user centering on the microcomputer 19a to determine the intention of the microcomputer 1a.
9a, a start switch 19b, course selection switches 19c, 19d, 19e, a display 19f for displaying the operation of the user or the operation of the washing machine, a drive circuit 19g for opening / closing a water supply / drain valve and rotating a drive motor, and the like. Be composed. Outputs of the cloth amount sensor 71 and the water level sensor 17b are input to the microcomputer 19a. With this configuration, the control device automatically controls water supply and drainage, a drive motor, and the like based on information from each sensor so as to perform washing reflecting the user's intention.

FIG. 11 shows the structure of the water level sensor 17b.
The plastic cylinders 17d and 17e are circular rubber films 17
f, the tube 17e is integrated with the cylindrical body 17e.
There is a spout 17g for inserting c. A coil 17h is housed inside the cylindrical body 17d, and a cylindrical ferrite core 17i that moves into the coil 17h includes a spring 17j.
And a rubber film 17f. When the pressure in the water chamber 17a for the water level sensor rises due to the water level in the washing tub 5, the pressure in the cylindrical body 17e connected by the tube 17c also rises.
Push up i. As a result, the inductance of the coil 17h increases.

FIG. 12 shows the electrical connection of the water level sensor 17b. A parallel circuit composed of a coil 17h and a capacitor 17k is connected to an oscillation circuit 17l. The sine wave output of this parallel oscillation circuit is converted into a rectangular wave by an
9a. FIG. 13 shows an example of the relationship between the oscillation frequency and the water level. If the amount of water is large and the water level is high, a large amount of ferrite core 17i is inserted into the coil and the coil 17i
The oscillation frequency decreases because the inductance increases. The microcomputer 19a stores this relationship as a table internally, detects the frequency from the input rectangular wave, and knows the water level.

The rated washing capacity 7k constructed as described above
A description will be given of a case where a large amount of laundry, for example, approximately 6 kg of laundry, which is almost rated, is washed in a fully automatic washing machine of g. FIG.
In this case, the water level Ha during washing (the height from the bottom of the washing tub to the water surface 8), the movement of the laundry 9, the state of circulation of the washing water 8, the washing water from the discharge openings 25a, 26b, 25c, and 25d. The state of eight ejections is shown.

The laundry 9 and the detergent are put into the washing tub 5,
Select the high water level course 19c with the course selection switch,
When the start switch 19b is pressed, the amount of the laundry 9 is detected first. As a method of detecting the amount of the laundry, a method of directly measuring the mass of the laundry with a load sensor attached to the hanging rod 4b, or a method of rotating the rotating blade 6 that continues to rotate by inertia when the rotating blade 6 is rotated or stopped. There is a method of measuring, by the back electromotive force of the drive motor 11, that the rate of decrease in the number differs depending on the amount of the laundry. FIG. 15 shows a cloth amount sensor 71 for detecting the cloth amount, which is the mass of the laundry in the latter method, and its electrical connection to the drive motor 11.

The drive motor 11 receives a signal from the microcomputer 19a and outputs a two-way three-terminal thyristor 19ga, 1
A commercial power supply is applied via 9 gb to rotate. The microcomputer 1 is connected to the gate terminal of the two-way three-terminal thyristor 19ga.
When a signal from the microcomputer 9a is applied, the drive motor 11 rotates forward, and when a signal from the microcomputer is applied to the gate terminal of the two-way three-terminal thyristor 19gb, the drive motor 11 rotates reversely. By rotating the drive motor 11 for the loaded laundry, the belt 13,
It is moved by the rotor 6 via the transmission 12. At this time, the resistance applied to the rotor 6 changes depending on the amount of the laundry. This change largely appears in the back electromotive force that appears between the terminals when the driving of the drive motor 11 is stopped.

FIG. 16 shows the operation timing of the cloth amount sensor 71. The drive motor 11 rotates for a short time by inertia even when the commercial power is turned off. At this time, the drive motor operates as a generator and generates a voltage between terminals. This voltage and frequency change due to inertial force. That is, the laundry on the rotor carries a part of this inertial mass. The cloth amount sensor 71 divides the back electromotive voltage appearing in the capacitor 11a connected between the drive motor terminals with the resistors 71a and 71b, takes out the voltage in a form electrically insulated using the photocoupler 71c, and converts it into a pulse by the inverter 71d. Convert and output to microcomputer. The cloth amount is detected from the time interval of this pulse.

FIG. 17 shows an example of the relationship between the cloth amount and the pulse time interval in the cloth amount sensor 71. The pulse time interval ΔT and the amount of cloth are in a proportional relationship, and if this relationship is stored in advance in a microcomputer as a table, the amount of cloth can be known by measuring the time interval between pulses input to the microcomputer. At this time, accuracy can be improved by performing measurement a plurality of times.

After the cloth amount is detected by the cloth amount sensor 71,
The control device 19 controls the water supply valve 18 to start water supply. While monitoring the signal from the water level sensor 17b, the control device 19 supplies water into the washing tub 5 according to the amount of the laundry until the water level reaches a high water level Ha such that substantially all of the laundry is immersed in water. When the water level reaches the water level Ha, the water supply valve 18 is closed to stop water supply. The water level Ha is determined by the diameter Φ of the washing tub 5 and the bath ratio during washing (the amount of water (kg) used per kg of laundry). For example, in a washing tub of Φ = 470 mm, for example, a bath ratio of 8
Then, the water amount is 8 × 6 (kg) = 48 (kg), and the water level Ha is about 270 mm. Water level H at rated time (8 kg)
m is about 320 mm in a similar calculation.

The discharge openings 25a and 25b are provided below the upper balancer 16 at a position 20 to 50 mm higher than the water level Hm so that the jetted washing water 8 can sufficiently spread even when placed at the rated time. The bath ratio is 6 ~
About 10 is desirable.

At such a high water level Ha, the laundry 9 floats in the washing water 8 and a part of the laundry 9 appears on the water surface 8a. The laundry 9 below the water surface 8a is separated from the rotary wings 6.

When the water supply is completed, the washing process starts. When the washing process is started, the control device 19 controls the drive motor 11 to repeat clockwise rotation / pause, left rotation / pause. The rotation of the drive motor 11 is transmitted to the rotary wing 6 via the belt 13 and the transmission 12. Therefore, the rotating blades 6 rotate in response to the rotation of the drive motor 11, the laundry 9 and the washing water 8 are stirred, and the laundry 9 is washed.

When washing is started, for example, the rotor 6
Right rotation at a speed of 0 to 200 rpm for 1 second, followed by 0.7
To repeat the repetition of a pause of second, then left rotation at the same speed as right rotation for 1 second, followed by a pause of 0.7 second for 15 minutes,
The control device 19 controls the drive motor 11. When the rotary wings 6 rotate, the back blades 6a also rotate, and the washing water 8 between the washing tub 5 and the outer tub 3 passes through the water suction port 24 opened in the center of the washing tub 5 and the hub 7. The water is sucked into the back blade 6a, and is pushed out by the centrifugal pump action by the rotation of the back blade 6a, and the water introduction openings 22a, 22b, 22c, 22d.
Flows into the washing water circulation passages 21a, 21b, 21c, 21d through the water conduits 39a, 39b, 39c, 39d, and from the discharge openings 25a, 25b to the washing water surface 8a in the washing tub 5.
The water is spouted to the upper laundry 9 and also spouted to the laundry 9 in the washing water in the washing tub 5 from the discharge openings 25c and 25d. The lint collecting net 36 attached to the discharge opening 25b collects lint contained in the washing water 8.

The water level in the washing tub rises only by the washing water jetted into the washing tub 5, and the water level of the washing water between the outer tub 3 and the washing tub 5 decreases. The washing water passes between the outer tub 3 and the washing tub 5 through the return hole 27 (hole for dehydration) on the side surface below the washing water surface 8a, the bottom return hole 28, and the gap between the rotary wing 6 and the washing tub 5. And circulates as shown by the arrow in FIG.

Thus, the discharge opening 25a at the top of the washing tub 5
Since the washing water fountains from a wide area, the washing water can be widely applied to the laundry 9 floating on the washing water surface 8a, and the permeation of the washing water 8 into the laundry is promoted, and the washing power is improved. improves. In addition, the washing water from the discharge opening 25b falls into the washing tub after the lint separated from the laundry 9 contained therein is collected by the lint collecting net 36. As a result, adhesion of lint to the laundry 9 is prevented, and washing with a clean finish can be performed.

Further, the discharge opening 25 submerged under the washing water surface
The washing water 8 spouts downward from horizontal from c and 25d. For this reason, a water flow is generated in the washing tub 5 that directs the laundry 9 in the washing water 8 downward, that is, toward the rotary wing 6. The laundry 9 is pushed by the water flow and touches the rotary wings 6, twists and gathers in the center by the rotation thereof, and sequentially moves on the washing water surface. That is, the movement of the laundry 9 in the washing water 8 to move upward on the rotary wing 6 axis and downward and upward along the wall surface of the washing tub 5 is promoted. The cleaning power is improved by increasing the friction or the friction between the cloth and the blade.

Next, a case where a small amount of laundry is washed will be described. FIG. 18 shows the water level Hb during washing, the movement of the laundry 9, the state of circulation of the washing water 8, the discharge opening 25 in this case.
The state of discharge of washing water from a, 25b, 25c, and 25d is shown. The laundry 9 and the detergent are put into the washing tub 5, the low water level course 19d is selected by the course selection switch, and the start switch 19b is pressed. To detect the amount of Thereafter, the water supply valve 18 is controlled by the control device 19 to start water supply. Based on the signal from the water level sensor 17b, the low water level H such that the laundry is substantially immersed in water according to the amount of the laundry.
Water is supplied to the washing tub 5 until b.

If the small amount is 4 kg and the bath ratio is the same as the high water level, the water level Hb is 138 mm. Discharge opening 2
5c and 25d are designed at a position 20 to 50 mm higher than this water level. At this time, the discharge openings are all on the washing water surface 8a. At such a low water level, the laundry 9 floats in the washing water 8 and a part of the laundry 9 appears on the washing water surface 8a.
The laundry under the water surface is separated from the rotor 6.

When the water supply is completed, the washing process starts. The washing process is the same as at the high water level mentioned above.

FIG. 19 shows an example of the relationship between the circulation flow Q and the head H by the back blade pump. This is the result of conducting an experiment in a state where only one wash water is used without using the laundry with the pair of two covers of the flow path forming means. Here, the head H is the height from the washing water surface 8a to the discharge opening. As shown in the figure, the circulation flow rate Q decreases as the head increases. Therefore, considering the circulation paths 21a and 21b, the head H is low at the low water level Hb.
And the circulating water amount Q becomes smaller than the high water level Ha. That is, in this state, the amount of washing water discharged from the discharge openings 25a and 25b is small.

FIG. 20 shows the circulation when the experiment was carried out in the condition of only the washing water without the laundry as in FIG. Flow Q
It is a value showing the relationship between the return hole total area S below the washing water surface 8a. As shown, the total area S under the water surface is 50 cm
^When it becomes less than ² , the circulation flow rate Q sharply decreases. In the case of 70 cm ² or more, the circulating flow rate Q has a substantially constant value determined by the capacity of the back blade pump used. In this embodiment, it is 80 l / min. The maximum value of the circulation flow rate Q is smaller than that of FIG.
This is because, unlike the case of FIG. 19, there are four, and the absolute water amount per one is reduced.

At this time, when the return holes 27 are uniformly distributed in the washing tub 5, the return hole area S below the water surface is smaller at the low water level Hb than at the high water level Ha. The amount of the washing water returning to 6a becomes smaller than the flow rate by the pump action of the back blade 6a, and as a result, the circulation flow rate Q decreases.
When the rotary wing 6 is inverted several times, the washing water cannot be returned from the washing tub 5 to the outer tub 3 and the washing tub 5, and the amount of the washing water supplied to the back blade 6a becomes insufficient, and the circulation flow rate decreases. There was a problem.

Therefore, in this embodiment, the return holes 27 are densely arranged below the lower discharge opening, particularly below the low water level,
The bottom return hole 28 is also provided on the bottom of the washing tub so that the total return hole area A below the water surface does not fall below 50 cm ² even at a low water level, and the circulation flow rate Q is 80 l / min. Also, the return hole total area A is at least 25 cm.
² so that the circulation flow rate Q does not fall below 50 l / min. In particular, the discharge openings 25c, 2
5d is more affected by the decrease in the total area A of the return holes below the water surface than by the effect of the head H.

FIG. 21 shows an example of the relationship between the circulating flow rate Q by the back blade pump and the area A of the water introduction opening. This is also the result of conducting an experiment in a state where only two washing waters are used without putting laundry, as in FIG. As shown, the circulation flow rate Q increases in proportion to the water introduction opening area A. In the present embodiment, the water introduction opening area A
The washing water is introduced into the back blade 6a in a sufficient amount, specifically, at least so that the circulation flow rate Q does not fall below 50 l / min.

As described above, in this embodiment, even in the case of the low water level, there is a sufficient total area of the return hole 27 below the surface of the washing water, and the washing water jetted into the washing tub immediately passes through the return hole and communicates with the outer tub. Since the washing water is returned to the washing tub, the washing water supplied to the back blade pump 6a does not run short, and the water introduction openings 25a, 25
Since the areas of b, 25c and 25d are large, the discharge openings 25c and 2 in the center of the washing tub are not reduced without reducing the amount of circulating water.
Since the fountain is sprayed over a wide range from 5d, it is possible to widely apply the washing water to the laundry floating on the washing water surface.

The discharge opening 25a located one step higher
Although the water force is lower than that of the discharge openings 22c and 22d, the washing water is jetted downward from the horizontal. In other words, the washing water falls on the laundry floating on the washing water surface like a two-stage waterfall, and promotes the penetration of the washing water into the laundry, thereby improving the washing power. In addition, the washing water from the discharge opening 22b is collected by the lint collecting net 36 to collect lint separated from the laundry contained therein, and then falls into the washing tub. As a result, even at a low water level, the lint is prevented from adhering to the laundry, and a clean finish can be achieved.

A case where a small amount (eg, up to 2 kg) of stubborn soiled laundry is further washed will be described. FIG. 22 shows the water level Hc during washing, the movement of the laundry 9, the state of circulation of the washing water 8, and the state of discharge of the washing water from the discharge openings 25 a, 25 c, 25 d in this case. When the laundry 9 and the detergent are put into the washing tub 5, the extremely low water level course 19e is selected by the course selection switch, and the start switch 19b is pressed, first, the amount of the laundry 9 is measured by the cloth amount sensor 71 as described above. To detect. Thereafter, the water supply valve 18 is controlled by the control device 19 to start water supply. Based on a signal from the water level sensor 17b, the laundry is washed to an extremely low water level Hc such that approximately half of the laundry is soaked in water. Water is supplied to tank 5. This water level Hc is previously set to a low water level by an experiment, for example, 50 to 80.
mm. In such an extremely low water level, the laundry 9
Does not float in the washing water and the laundry is always
And maintain the state of contact.

When the water supply is completed, the washing process starts. At this time, the upper openings are all on the washing water surface 8a.

When washing is started, for example, the rotor 6
A repetition of a 0.5-second clockwise rotation at 0-200 rpm followed by a 0.1-second pause, followed by a 0.5-second counterclockwise rotation at a speed similar to the right-hand rotation, followed by a 0.1-second pause. The control device 19 controls the drive motor 11 so that the operation is repeated for 15 minutes. This repetitive operation is different from the above-mentioned high water level and low water level. The rotation / rest ratio is increased from 1.4 at high and low water levels to 5. When the rotor 6 rotates, the back blade 6
a rotates together, and the washing water between the washing tub 5 and the outer tub 3 is sucked between the back blade 6a and the bottom of the washing tub 5 through the suction port 8a opened in the center of the hub 7. And back wing 6a
It is pushed out by the centrifugal pump action by the rotation of.

The water introduction openings 22a, 22b, 22
c, 22d to headraces 39a, 39b, 39c, 39d
And flows into the washing water circulation paths 21a, 21b, 21c, 21d through the discharge openings 25a, 25b, 25c, 25d and intermittently jets into the washing tub 5. The water level in the washing tub 5 rises and the water level of the washing water between the outer tub 3 and the washing tub 5 decreases by the amount of the water jetted into the washing tub 5. The washing water 8 flows through a return hole 27 provided densely on the wall surface near the bottom of the washing tub 5, a bottom return hole 28 provided on the bottom surface of the washing tub 5 around the rotor 6, or a gap between the rotor 6 and the washing tub. Then, it returns between the outer tub 3 and the washing tub 5 and circulates as shown by the arrow in the figure.

The height of the discharge openings 25c and 25d is
Determined by a small definition and bath ratio. The water level is determined by determining the small amount and the bath ratio. If it is not higher than this water level to a certain extent, the jetted washing water will not spread sufficiently.
Therefore, the height of the discharge openings 25c and 25d may be higher than this water level by 20 mm or more. There is no particular upper limit, and the height may be the same as the discharge openings 25a and 25b. However, if the height is too high, the ejection of the washing water 8 tends to be weak.
It is desirable to set the water level to about 50 mm.

In addition to using this water level as a reference, as a simple method, since the small amount is approximately 1/4 of the rated value, the height is 1/4 of the rated water level or 1% of the height of the discharge openings 25a and 25b. / 4 may be used as a reference. That is, the height is higher than any one of the heights and is equal to the height of the discharge openings 25a and 25b, and preferably higher than any one of the heights by about 20 mm to 50 mm.

In this embodiment, even in the case of the extremely low water level, the return hole 28 is also provided on the bottom of the washing tub, so that a large amount of washing water can be applied to the laundry 9 on the washing water surface in a wide range similarly to the low water level. As a result, the penetration of the washing water into the laundry is promoted, and the detergency is improved. In the dry state, about half of the laundry that has been on the surface of the washing water is shortly after the start of washing, and the portion of the laundry that is entirely wet and sinks below the water surface increases. Furthermore, since the portion above the water surface is also wet with the washing water, the washing water washing effect can be effectively utilized.

Further, in this case, the laundry does not float on the surface of the water, but always comes into contact with the rotor 6 and the mechanical force acting directly on the laundry 9 by the rotor 6 increases. Further, the cleaning power is improved. Further, since the rotation / pause time ratio is increased as described above, the mechanical energy applied within the same washing time is also increased, and the washing power is higher than in the case of high and low water levels. Further, the effect that the discharged washing water presses the laundry from above can be expected, and the mechanical action of the rotary wing 6 is further improved, and the cleaning power can be improved.

As described above, it is possible to cleanly remove mud stains on white socks and collar sleeve stains on shirts, which are difficult to remove at high or low water levels.

The washing water from the discharge opening 25b is collected by the lint collecting net 36 to remove lint from the laundry contained therein, and then falls into the washing tub. As a result, even at such an extremely low water level, the attachment of lint to the laundry is prevented, and a clean finish of the laundry can be achieved.

In the above description, the high, low and extremely low water levels have been designated by the course selection switch. However, if the accuracy of the cloth amount sensor 71 is high, the course and the water level may be automatically determined based on the cloth amount. . However, the course with the extremely low water level is different from the others in the laundry to be washed and the washing method. Therefore, it is preferable to provide this course selection switch.

In this embodiment, the washing water circulation paths 21a, 21
b, 21c, and 21d, 21a and 21b face each other around the rotation axis of the washing tub; 21c and 21d face each other;
1c is provided at an angle of 90 degrees. This is to prevent the member of the cover that constitutes the washing water circulation path from being imbalanced in the washing tub due to its arrangement. Covers made of the same material and of the same height face each other for balancing. Further, at this time, the washing water circulation paths 21a and 21c are arranged at an angle of 90 degrees in order to obtain the water guide opening area of each cover widely and symmetrically on the circumference. It is also possible to change the angle by changing the material of the cover to achieve a balance.

In the description of this embodiment, the number of washing water circulation paths is four in total, but the invention is not limited to this. For example, there may be a total of eight wires, two to four in height to the upper balancer and two to four in height halfway.

FIG. 23 shows a second embodiment of the present invention. This is a cross-sectional view along the line AA in FIG. 1, in which the first and second covers and the third and fourth covers have different water introduction opening areas. In the previous embodiment, since the water introduction openings are all the same, in the case of the low water level and the extremely low water level, the discharge amount of the washing water is larger in the discharge openings 25c and 25d than in the discharge openings 25a and 25b due to the difference in the head. Then, the water introduction opening 22a,
The area of 22b was made larger than that of the water introduction openings 22c and 22d, and the difference in head was corrected. As a result, even in the case of a low water level or an extremely low water level, substantially the same amount of jet water can be obtained in all the discharge openings.

In order to increase the amount of water jetted from the discharge opening 25d where the lint collecting net is installed, the area of the water introduction opening 22b may be further increased. In this way, the amount of collected lint can be further increased. In this way, the amount of water for circulating discharge can be freely set according to the function of the discharge opening by the area of the water introduction opening.

In FIG. 23, the bottom return hole 28 is not provided. If the return hole 27 can be arranged sufficiently densely on the lower side surface of the washing tub 5 and the total return hole area under the washing water can be made 50 cm ² or more, the bottom return hole 28 is not necessary.

FIG. 24 shows a third embodiment of the present invention. This is a cross-sectional view taken along the line AA in FIG. 1. Contrary to the second embodiment, the first and second covers have third and fourth water introduction opening areas.
4 is smaller than the area of the water introduction opening of the cover.
In this embodiment, the discharge from the first and second discharge openings is stopped when the water level is low or very low. Due to the synergistic effect of a large head and a small water introduction opening area, the first and second circulating water volumes are reduced and the discharge is stopped. Of course, when the water level is high, the first and second circulating water volumes are set so as to be sufficient for jetting. In this case, at the low water level and the ultra low water level, the washing water spouted from the third and fourth discharge openings hits at the center of the washing tub, and the washing water 8 is evenly spread over the entire washing tub 5.
Can be applied.

FIG. 25 shows a plan sectional view at the positions of the third and fourth discharge openings and the direction in which the washing water is jetted out in this embodiment. A guide is provided in the discharge opening to regulate the direction in which the washing water is ejected, so that the direction in which the washing water is ejected is regulated to prevent collision of the ejection water flow at the center. The jet water flow from the third discharge opening jets left toward the center of the washing tub, and the jet water flow from the opposing fourth discharge opening jets left toward the washing tub center. As a result, the washing water can be evenly applied to the entire surface of the washing tub 5.

FIG. 26 is a longitudinal sectional view showing a fourth embodiment of the present invention. In the present embodiment, the same reference numerals as those in the embodiment of FIG. As in the first embodiment, the washing water circulation path 21 is provided on the inner peripheral side wall surface of the washing tub 5 around the rotation axis of the washing tub.
a and 21b face each other, 21c and 21d face each other, 21a
And 21c are provided at an angle of 90 degrees. Washing water circuit 2
1a, 21b, 21c and 21d are formed by the inner peripheral side wall surface of the washing tub 5 and the covers 20a, 20b, 20c and 20d. Further, the return holes 27 are uniformly arranged on the side surface of the washing tub. Reference numeral 45 denotes a lower balancer which is a main part of the present invention, which is a separate component from the washing tub 5 like the upper balancer 16 and is provided around the rotating blades 6 at the bottom of the washing tub 5. The room in the bottom balancer 45 is double-partitioned, and a fluid is sealed in each of them to reduce the run-out of the washing tub 5 by the action of balancing the fluid during dehydration.

In the first embodiment in which the return holes 27 at the lower part of the washing tub are densely formed and the bottom return holes 28 are also provided at the bottom of the washing tub, there is a problem in the strength of the washing tub, and the number thereof cannot be increased much. That is, if the return holes are excessively increased, the rigidity of the lower portion of the washing tub decreases, and the deformation and vibration of the tub increase due to high-speed rotation during dehydration, thereby generating noise. The present embodiment solves this problem and provides another means for returning sufficient washing water to the back blade even with a return hole similar to the conventional one.

FIG. 27 shows the rotor 6 along the line DD in FIG.
FIG. 28 is a cross-sectional view of FIG.
It is a longitudinal cross-sectional view along a line. The details of the configuration of the lower balancer 45 and the circulation path will be described below with reference to FIGS. 46,
Reference numeral 47 denotes a room partitioned by walls, into which liquids such as salt water (not shown) are inserted. In addition, the same room is provided with a headrace channel 39 following the headrace openings 25a, 25b, 25c, 25d.
a, 39b, 39c, 39d are also provided below, so that the entire circumference communicates. 48 is the lower balancer 4
5, steps 48a, 48b, 48c, 48 provided on the inner periphery of
d is a step provided on the upper wall surface of the headrace channel, and forms a labyrinth in combination with a step 49 provided on the outer periphery of the rotary wing 6 to reduce the leakage of the washing water 8 from the step.

Reference numeral 50 denotes a return passage formed between the inner wall and the bottom of the washing tub 5 by a projection 51 provided on the outer periphery and the bottom of the lower balancer 45, and the inside of the washing tub 5 when the back blade 6a is operated. , And is supplied to the central portion of the back blade 6a through the lower side of the bottom wall 52. Alternatively, as shown in FIG. 39, the return passage 50 penetrates outside the washing tub 5,
A configuration may be adopted in which the washing water is sucked into the back blade 6a from the water inlet 24 in the same manner as the washing water from the return hole 27.

FIG. 29 is an elevation view of the cover 20a, FIG. 30 is an elevation view of the cover 20b, and FIG. 31 is covers 20c and 20d.
FIG. The difference from the covers of FIGS. 5 to 7 is that the steps 48a, 48b, 48c, 48d provided on the upper wall surface of the headrace canal.
Is merely provided.

FIG. 32 shows covers 20a, 20b, 20c,
It is the figure which looked at the lower balancer 45 from the upper part in the state which removed 20d. In the figure, 53a, 53b, 53c, 53d are headrace side walls 34a, 34b, of the cover constituting the circulation path.
A wall where the outsides of 34c and 34d meet, 54a, 54b,
54c, 54d are headraces 39a, 39b, 39c, 39
d is a bottom surface that forms a water conduit by combining with the water conduit upper wall surfaces 35a, 35b, 35c, and 35d of the covers 20a, 20b, 20c, and 20d. Further, as described above, when the lower balancer 45 is provided at the bottom of the washing tub 5, the protrusion 51 forms a return passage 50 between the projection 51 and the inner wall surface of the washing tub 5 at the recess. The protrusion 51 also protrudes from the lower part as shown in the sectional view taken along line FF of FIG.
A return passage is also formed between the bottom and the bottom. FIG. 34, FIG.
32 is a sectional view taken along line GG and HH of FIG. 32, respectively. On the other hand, the rooms 46 and 47 of the lower balancer 45 are all in communication with each other, and the lower part of the water channel 39 is reduced as shown in FIG.

During washing, the washing water in the washing tub partially returns
7 returns to the space between the outer tub 3 and the washing tub 5 and passes through the water inlet 24 to the back blade 6a. In the case of the low water level and the ultra low water level, since the return holes 27 below the washing water level are small, most of the washing water flows from the return passage 50 to the back blade 6a. Then, by the centrifugal pump action of the back blade 6a, the water is spouted from each water introduction opening through the water introduction passage and the circulation passage into the washing tub through the discharge opening.

The operation of the washing process at each water level is the same as in the first embodiment, and a description thereof will be omitted.

With the arrangement of the return holes 27 as described above, the number of the return holes 27 opening below the surface of the wash water 8 is extremely reduced. 8 cannot be supplied sufficiently. However, in this embodiment, the outer peripheral portion of the lower balancer 45,
Also, the washing water 8 can be sucked from the return passage 50 formed between the protrusion 51 provided at the bottom and the washing tub 5, so that the necessary and sufficient washing water 8 according to the pumping capacity of the back blade 6a is provided. Can be supplied. That is, the return passage 50 plays a role of increasing the return hole density at the lower part of the washing tub and replacing the bottom return hole at the bottom of the washing tub in the first embodiment.
Further, by providing the lower balancer 45, the runout of the washing tub during dehydration can be further improved.

Further, the bottom of the washing tub 5 is a simple flat surface which does not require complicated forming with irregularities as in the first embodiment, and the strength can be increased by providing a lower balancer here. .

Further, in terms of manufacturing, the assembling time of the washing machine can be reduced as compared with the method of installing the lower balancer on the outer wall of the washing tub. Assembling is first in washing tub 5 in outer tub 3
Then, the lower balancer 45 is fitted into the bottom of the washing tub 5, and the four covers 20 a, 20 b, 20 c, 20 d forming a circulation path with the inner wall surface of the washing tub 5 are then attached to the lower balancer 4.
5. Fix it at a predetermined position on the inner wall surface of the washing tub. Then, the rotary wing 6 is fixed to the dual output shaft 6c with the screw 6b.
Thus, there is also an advantage that the assembling work is simplified in terms of manufacturing.

FIG. 36 shows a fifth embodiment, in which a small projection 60 for preventing foreign matter from flowing is provided at the entrance of the return passage 50. Since the inflow port of the return passage 50 of the third embodiment is wide, there is a risk that a button or the like may be pinched during the washing. Therefore, in the present embodiment, the inlet is divided by the small protrusion 60. In the figure, reference numeral 61 denotes a suction port formed by the small protrusion 60. FIG. 37 shows a cross-sectional shape of a portion where the small protrusion 60 is provided. Not only the unevenness due to the small protrusions 60 but also a large number of small holes for preventing inflow of foreign matter may be arranged at the entrance of the return passage 50, for example.

According to the above embodiment , since the washing tub is provided with a means for jetting the washing water downward from the horizontal, the washing water can be sufficiently applied to the laundry. Since the means for ejecting washing water having different heights is provided, an effect corresponding to the amount of laundry can be obtained. At the high water level, the lower jetting means can promote the circulation of the laundry. At the low water level or the extremely low water level, the washing water is applied to the laundry in two stages to prevent the rising of the washing water, It also promotes penetration.

Since the return hole and the bottom return hole having a sufficient total area or the return passage around the lower balancer are provided below the surface of the washing water in the washing tub, the circulation path leading to the upper end of the washing tub and A sufficient flow rate of washing water circulation can be ensured by the pumping action of the back blade in the circulation path leading to the height of the washing tub center. Then, a sufficient amount of washing water can be jetted into the washing tub from the discharge opening of each circulation path.

[0098] For this reason, in the case of the high water level, since the water is widely sprayed from the discharge opening at the upper part of the washing tub, the washing water floating on the washing water surface can be widely applied with the washing water.
It promotes the penetration of the washing water into the laundry and improves the detergency. Further, a large amount of lint contained in the washing water can be collected by the lint collection net provided at another discharge opening. Further, the washing water spouts downward from the horizontal from the discharge opening submerged in the washing water. This creates a water flow in the washing tub that directs the laundry downwards, i.e., toward the rotor. The laundry is pushed by the water flow and touches the rotating wings. The rotation causes the laundry to be twisted and gathered at the central portion, and sequentially move on the washing water surface. In other words, the movement of the laundry in the washing water is promoted to move up and down on the rotary blade axis and downward and upside down along the wall surface of the washing and dewatering tub, and during this movement, the friction between the cloth and the cloth or The detergency is improved by increasing the friction of the blades.

In the case of a low water level, there is a sufficient return hole and a bottom return hole below the surface of the washing water, and the washing water squirted into the washing tub immediately passes through the return hole and is located between the outer tub and the washing tub. As there is no shortage of washing water to be supplied to the back impeller pump, the amount of circulating water does not decrease, and water is widely sprayed from the third and fourth discharge openings in the center of the washing tub, so that it floats on the washing water surface. Washing water can be applied to the raised laundry extensively.
Further, although the water force is lower than that of the upper discharge opening than that of the lower discharge opening, the washing water is jetted downward from the horizontal. In other words, the washing water falls on the laundry floating on the washing water surface like a two-stage waterfall, and promotes the penetration of the washing water into the laundry, thereby improving the washing power. Further, a large amount of lint contained in the washing water can be collected by the lint collection net provided at another discharge opening. In the case where the lower balancer is arranged, the washing water spouted into the washing tub immediately returns to the space between the outer tub and the washing tub through the return passage. It is gushing.

In the case of the extremely low water level, the bottom of the washing tub also has a bottom return hole, and the one in which the lower balancer is disposed has a return passage. Water can be applied, and the penetration of the washing water into the laundry is promoted, and the detergency is improved. Furthermore, in this case, the laundry does not float on the surface of the water, but always comes into contact with the rotor, and the mechanical force acting directly on the laundry by the rotor increases.
The detergency is higher than at high and low water levels. Also on
Collection net provided in one of the side discharge openings circulates
Collects lint released from laundry in washing water
You. The amount of circulating washing water is high, as described above.
Low, low or very low water level
Can be collected.

[0101]

According to the present invention, the height of the washing tub is lower than the horizontal level.
Since there is a means for jetting the washing water in the direction,
We can pour washing water enough on thing. And height
Means for ejecting different types of washing water.
The effect according to the quantity of the object can be obtained. At high water level
The lower squirting means promotes laundry circulation
When the water level is low or extremely low, the washing water
On the laundry to prevent the rising of the wash water,
Can also be promoted. In addition, washing and dehydration tub
A part that fills the fluid so that it surrounds the back blade
By attaching a balancer with a
Balancer and first and second flow path forming means from inside the water tank
Can be assembled, and the assembling work is simplified.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of a fully automatic washing machine according to the present invention.

FIG. 2 is a transverse sectional view taken along line AA in FIG.

FIG. 3 is a longitudinal sectional side view taken along line BB in FIG. 2;

FIG. 4 is a longitudinal sectional side view taken along line CC in FIG. 2;

FIG. 5 is an elevation view of a cover 20a of the first embodiment.

FIG. 6 is an elevational view of a cover 20b of the first embodiment.

FIG. 7 is an elevation view of covers 20c and 20d of the first embodiment.

FIG. 8 is a sectional view taken along lines KK and LL in FIG.

FIG. 9 is a plan view of the washing tub.

FIG. 10 is an electrical connection block diagram of the fully automatic washing machine.

FIG. 11 is a structural diagram of a water level sensor.

FIG. 12 is an electrical connection diagram of a water level sensor.

FIG. 13 is a diagram showing a relationship between an oscillation frequency of a water level sensor and a water level.

FIG. 14 is a diagram showing a water level at the time of a high water level, a movement of laundry, and a state of circulation and discharge of washing water.

FIG. 15 is an electrical connection diagram of the cloth amount sensor.

FIG. 16 is an operation timing chart of the cloth amount sensor.

FIG. 17 is a diagram illustrating a relationship between an output pulse time interval of a cloth amount sensor and a cloth amount;

FIG. 18 is a diagram showing a water level at the time of a low water level, a movement of laundry, and a state of circulation and discharge of washing water.

FIG. 19 is a diagram showing a relationship between a head and a circulation flow rate.

FIG. 20 is a diagram showing the relationship between the circulation flow rate and the total return hole opening area.

FIG. 21 is a diagram showing a relationship between a circulation flow rate and a water introduction opening area.

FIG. 22 is a diagram showing a water level at the time of an ultra-low water level, a movement of laundry, and a state of circulation and discharge of washing water.

FIG. 23 is a cross-sectional view showing a second embodiment of the fully automatic washing machine according to the present invention.

FIG. 24 is a cross-sectional view showing a third embodiment of the fully automatic washing machine according to the present invention.

FIG. 25 is a diagram showing the cross sections of the third and fourth discharge openings of the third embodiment and the direction of the jet water flow.

FIG. 26 is a vertical sectional side view showing a fourth embodiment of the fully automatic washing machine according to the present invention.

FIG. 27 is a transverse sectional view taken along the line DD in FIG. 26;

FIG. 28 is a vertical sectional side view taken along line EE in FIG. 27;

FIG. 29 is an elevation view of a cover 20a according to the fourth embodiment.

FIG. 30 is an elevation view of a cover 20b according to a fourth embodiment.

FIG. 31 is an elevation view of covers 20c and 20d of the fourth embodiment.

FIG. 32 is a plan view of a lower balancer.

FIG. 33 is a vertical sectional view taken along line FF in FIG. 32;

34 is a vertical sectional view taken along line GG in FIG. 32.

FIG. 35 is a longitudinal sectional view taken along the line HH in FIG. 32;

FIG. 36 is a plan view showing a fifth embodiment of the fully automatic washing machine according to the present invention.

FIG. 37 is a longitudinal sectional view taken along the line II in FIG. 36.

FIG. 38 is a schematic view of a conventional fully automatic washing machine.

FIG. 39 is a longitudinal sectional side view taken along line EE in FIG. 27;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer frame, 2 ... Lid, 3 ... Outer tub, 3a ... Drain outlet, 3b ... Tank cover, 4a ... Buffer member, 4b ... Hanging rod, 5 ... Washing and dewatering tank, 6 ... Rotor blade, 6a ... Back blade , 6b ... screws, 6c,
6d: output shaft, 7: hub, 8: washing water, 8a: water surface, 9
... Laundry, 10 ... Drive base, 11 ... Drive motor, 1
1a: condenser, 12: conduction device, 13: belt, 1
4 drain valve, 15 drain hose, 16 upper balancer, 17a air chamber, 17b water level sensor, 17c tube, 17d, 17e cylindrical body, 17f rubber film, 1
7g: port, 17h: coil, 17i: ferrite core, 17j: spring, 17k: capacitor, 17l: oscillation circuit, 17m: inverter, 18: water supply valve, 18a
... water inlet, 19 ... control device, 19a ... microcomputer, 19b
... Start switch, 19c, 19d, 19e ... Coarse selection switch, 19f ... Display, 19g ... Drive circuit, 1
9ga, 19gb ... two-directional three-terminal thyristor, 20
a, 20b, 20c, 20d ... covers, 21a, 21
b, 21c, 21d: circulation path, 22a, 22b, 22
c, 22d: water introduction opening, 24: water intake, 25a, 25
b, 25c, 25d: discharge opening, 27: dehydration hole and washing water return hole, 28: bottom surface dehydration hole and washing water return hole, 34a,
34b, 34c, 34d ... water channel side walls, 35a, 35
b, 35c, 35d: wall surface of headrace channel, 36: collection net, 37: frame, 38: groove, 39a, 39b, 39c, 3
9d: headrace, 40a, 40b, 40c, 40d: wall
41a, 41b, 41c, 41d ... bottom of washing tub, 45 ...
Lower balancer, 46, 47… Room, 48, 48a, 48
b, 48c, 48d, 49 ... step, 50 ... return passage, 5
DESCRIPTION OF SYMBOLS 1 ... Protrusion, 52 ... Bottom wall, 53a, 53b, 53c, 5
3d: wall, 54a, 54b, 54c, 54d: bottom surface, 6
0: small protrusion, 61: suction port, 71: cloth amount sensor, 71
a, 71b: resistor, 71c: photocoupler, 71d: inverter, 101: outer tub, 102: washing tub, 103a,
103b, 103c, 103d: circulation path, 104a, 1
04b: discharge opening, 105: collection net, 106: return hole.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yosuke Nagano 502, Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. In-house (72) Inventor Mitsuyuki Togashi 502 Kandate-cho, Tsuchiura-city, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (72) Inventor Tamotsu Kamori 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. Within Business Unit (72) Inventor Toshiyasu Kamano 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Electric Co., Ltd.Electrical Equipment Division (72) Inventor Kyoichi Kanno 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Appliance Equipment Division (56) References JP-A-7-313785 (JP, A) JP-A -16389 (JP, A) JP flat 7-39679 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) D06F 39/08 D06F 17/04 D06F 37/12

Claims (8)

(57) [Claims] 1. A washing and dewatering tub accommodated in a water receiving tub, a rotating wing rotatably disposed on an inner bottom portion of the washing and dewatering tub, and a back surface of the rotating wing co-rotating with the rotating wing. The back blade and the back
A water-guiding opening that opens around the blade and a front from the water-guiding opening
Along the inner wall of the washing and dewatering tub,
First flow path forming means having a water conduit extending upward
A water guide opening opening around the back blade and the water guide opening;
From the mouth along the inner wall surface of the washing and dewatering tub,
And a headrace that extends to a position lower than the flow path forming means.
In a fully automatic washing machine provided with a second flow path forming means for performing rotation and a driving device for reversing the rotation of the rotating blades, the inside of the washing and dewatering tub surrounds the back blade.
, A balancer having a chamber for enclosing a fluid is attached, and the first and the second in the circumferential direction of the balancer
In the portion of the channel forming means where the headrace is configured,
So that the cross-sectional area across the circumference of the room is reduced
Entire circumference communicated with, automatic washing machine, characterized in that a downward discharge opening from the horizontal above the first and second flow path forming unit the room Te. 2. The fully automatic washing machine according to claim 1, wherein
The water conduit of the second flow path forming means is higher than 1/4 of the rated water level of the washing and dewatering tub .
Automatic washing machine, wherein the benzalkonium extends to a position lower than the water conduit. 3. The fully automatic washing machine according to claim 1, wherein
Water conduit of the second flow path forming means Ru extends to a position lower than the water conduit of said first flow path forming means headrace higher the first flow path forming unit than the height of 1/4 of the fully automatic washing machine, wherein a call. 4. The fully automatic washing machine according to claim 1, wherein two of said first flow path forming means are opposed to each other, and two of said second flow path forming means are also opposed to each other. A fully automatic washing machine, characterized in that the flow path forming means are arranged at intervals of 90 degrees. 5. A fully automatic washing machine according to claim 1, wherein said first channel forming means has a water guide opening.
Of the opening area, the water conveying opening of the second flow path forming means
A fully automatic washing machine characterized by having a larger opening area . 6. The fully automatic washing machine according to claim 4 ,
The first flow path forming means is provided with flow path forming means provided with a collecting net at the discharge opening, and the opening area of the water guiding opening of the flow path forming means is changed to the water guiding opening of another flow path forming means. Opening
A fully automatic washing machine characterized by having a larger area . 7. A washing machine according to any one of claims 1 to 6, the washing and dewatering tank side to provide a washing濯水return hole Rutotomoni, the return said hole second flow A fully automatic washing machine, which is densely provided at a position lower than the second flow path forming means than at a position higher than the path forming means. 8. A washing machine according to any one of claims 1 to 6, prior SL washing and dewatering tank inner wall surface of the during the balancer, and characterized by providing a return path of the washing water Fully automatic washing machine.