JPH11137891A - Washing water circulating device of direct connection type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of washing water circulation and washing clothes in a washing machine. SOLUTION: This washing machine 101 has an agitator 111, an insulator 121 and a hub 131, and their connecting means. The agitator 111 is connected to the bottom of the tub of the washer, and washing wings 112 for washing clothes are integrally formed in the agitator 111. The insulator 121 for guiding washing water is connected to the bottom of the agitator 111. And the hub 131 is connected to the bottom of the insulator 121 and is connected to the drive shaft for transmitting the rotation of the drive shaft to the insulator 121 and the agitator 111.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct connection type washing machine. In particular, after supplying the washing water for washing the laundry inside the washing tub to the guide hole of the agitator integrally formed with the washing tub and the through hole of the insulator, the washing water is passed between the cylindrical rib of the hub and the agitator. In addition to circulating the washing water in the circulation hole of the agitator, the washing water filling the bottom of the outer tub is also supplied to the circulation hole of the agitator by a pumping rib formed in the hub to supply the washing water to the washing tub in a chain. As a result, the circulation efficiency and washing efficiency of the washing water can be improved with a simple configuration,
The present invention relates to a washing water circulating device for a directly-connected washing machine, which simplifies an assembling process, does not cause frequent troubles, and facilitates repair.

[0002]

2. Description of the Related Art FIGS. 1 and 2 show a washing water circulation structure of a conventional washing machine.

That is, the washing water circulation structure of the conventional washing machine 1 has a washing tub 2 mounted inside the washing machine 1 for washing by washing or dewatering the laundry, and a bottom surface of the washing tub 2. A washing wing 4 that is coupled to the wings and imparts an effect of undulating the laundry while being rotated by the drive shaft 7;
A pumping rib 5 formed at the bottom of the washing wing 4 and circulating washing water collected at the bottom of the washing tub 2 again;
The guide passage 3 formed in the cover 10 for supplying the washing water to the fluid balancer 12 by the pumping operation of the pumping rib 5 and the washing water guided by the guide passage 3 are again supplied to the inside of the washing tub 2. A discharge port 8 formed in the fluid balancer 12 and a filter 11 coupled to the insertion passage 6 of the fluid balancer 12 for filtering fuzz and foreign substances mixed with the washing water discharged to the discharge port 8. Is provided with the filter frame 9 in which is formed.

The operation and effect of the above-described conventional configuration will be described below.

First, when the laundry is put into the washing tub 2 of the washing machine 1 and a start button is pressed, water is supplied first, and then the washing wings 4 of the drive shaft 7 connected to the motor and the clutch rotate while the laundry is washed. Wash with stirring.

The washing water collected at the bottom of the washing tub 2 by the rotation of the washing wings 4 is pumped by the pumping ribs 5 of the washing wings 4.

Further, the washing water is discharged to an outlet 8 formed in the fluid balancer 12 while being supplied to the guide passage 3 formed by the cover 10 by the pumping action of the pumping rib 5 and the washing water is supplied to the washing tub 2. Supply again.

At this time, since the filter 11 coupled to the filter frame 9 is lying on the discharge port 8, the washing water discharged from the discharge port 8 passes through the filter 11 and the fluff mixed with the washing water. It filters out foreign substances and the like.

Therefore, the washing water filtered by the filter 11 is supplied to the washing tub 2 again, and the washing proceeds continuously.

However, the circulation structure of the washing water of the conventional washing machine as described above is very complicated.

That is, a cover 10 must be provided inside the washing tub 2 to guide the washing water pumped from the pumping rib 5 of the washing wing 4 to the fluid balancer 12.

Further, a fixing means for fixing the cover 10 to the washing tub 2 must be provided.

A cover 10 is provided on an upper part of the cover 10.
The structure of the fluid balancer 12 must be changed so that

Further, a discharge port 8 for supplying the washing water supplied to the cover 10 to the inside of the washing tub 2 must be formed inside the fluid balancer 12.

In particular, the outlet 8 must be provided with a filter frame 9 connecting / disconnecting a filter 11 for filtering fluff or the like mixed in the washing water.

As described above, since a large number of parts and the like are required to circulate the washing water, the number of assembly steps and the use of raw materials increase.

Further, since the washing water has to be pulled up to the upper stage of the washing tub 2 by the rotational force of the washing wings 4, an extremely heavy load is applied to the washing wings 4 and the motor.

Therefore, it is necessary to increase the capacity of the motor and the strength of the washing blade 4.

Further, frequent failures occur due to the above-mentioned complicated configuration, and repair is not easy.

In particular, the washing machine 1 has a cover during the washing.
Washing tub 2
Since the reference water level in the inside fell, the washing performance deteriorated.

Therefore, it is necessary to supply the washing tub 2 with an insufficient amount of water so as to reach the reference water level. Therefore, the problem that a large amount of washing water is used and the waste of water is severe cannot be ignored.

[0022]

SUMMARY OF THE INVENTION An object of the present invention for solving and compensating the above-mentioned conventional problems is to circulate the washing water more efficiently, improve the washing performance and improve the smoothness of the washing water. It is an object of the present invention to achieve circulation without giving excessive force to each part by circulation, and to prevent frequent failures and obtain simple repairs with a simple configuration.

[0023]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a washing machine in which washing water is drained to the center of a stirrer integrally connected to a washing tub and re-supplied to the periphery of the stirrer. Since circulation is achieved, improved washing efficiency can be obtained due to the short circulation path of the washing water. It is another object of the present invention to prevent waste of water and to obtain a more robust washing water circulation device and reduce the number of assembling steps by a simple combination of a washing tub and an agitator, and an insulator and a hub. become.

That is, the washing water circulating apparatus of the direct connection type washing machine according to the present invention comprises: a stirring body integrally formed with washing wings for washing laundry, which is connected to a bottom of a washing tub of the washing machine; An insulator coupled to a bottom of the insulator for guiding washing water; and a hub coupling means coupled to a bottom of the insulator and coupled to transmit a rotational force of a drive shaft to the insulator and the agitator. It is characterized by.

In a preferred embodiment, the connecting means of the hub comprises a plurality of hub inserts formed in the insulator for connecting the hub to the insulator in a correct position;
The apparatus further comprises a plurality of arms formed on the hub for coupling the hub to the hub insertion portion, and first fixing means for fixing the arm to the hub insertion portion.

In a preferred embodiment, the first fixing means includes a hook formed at a hub insertion portion of the insulator for fixing the hub to the insulator, and a hub arm so that the hook is inserted and fixed. It is characterized by having a hook hole formed.

In a preferred embodiment, the first fixing means includes a plurality of coupling holes formed in the stirring member for fixing the stirring member, the insulator, and the hub, and a hub so as to coincide with the coupling hole. A connecting hole formed in the insertion portion, a fixing hole formed in the arm of the hub so as to coincide with the connecting hole, and a fastening bolt inserted into the connecting hole, the connecting hole and the fixing hole and screwed together with the nut. It is characterized by having.

In a preferred embodiment, the upper part of the stirring body and the lower part of the washing tub are connected by a seamisong part.

In a preferred embodiment, the agitator has a plurality of circulation holes formed on the bottom surface of the agitator to facilitate the circulation of the washing water.

In a preferred embodiment, the washing blade formed on the stirring body is formed so that the inside becomes hollow.

In a preferred embodiment, the stirrer is made of steel.

In a preferred embodiment, the agitator is relatively shaped like a container.

In a preferred embodiment, the insulator is provided with a plurality of reinforcing ribs formed on the insulator for transmitting torque to the agitator or reinforcing the strength of the insulator.

In a preferred embodiment, the insulator is made of a synthetic resin.

In a preferred embodiment, the insulator is provided with a through hole at a central portion thereof to facilitate washing water circulation.

In a preferred embodiment, the shape of the arm formed on the hub is relatively shaped like a ladder.

In a preferred embodiment, a plurality of pumps formed on the bottom surface of the hub are provided on the bottom surface of the hub so that the washing water supplied from the agitator is generated from the center of the washing tub to the outside. It is characterized by having.

In a preferred embodiment, a radial center formed at the center of the bottom of the hub to prevent washing water from penetrating while an air gap is formed at the joint between the hub and the drive shaft. It is characterized by having a rib.

In a preferred embodiment, a cylindrical rib protruding from the center of the hub is provided to connect the hub to the drive shaft.

In a preferred embodiment, the cylindrical rib formed on the hub has a rounding surface formed on the cylindrical rib for uniformly guiding the washing water supplied through the guide hole of the agitator. It is characterized by having done.

In a preferred embodiment, the upper surface of the cylindrical rib is flat.

In a preferred embodiment, the hub is made of synthetic resin.

In a preferred embodiment, a flat plate formed on the drive shaft for connecting the hub to the drive shaft is provided, and a second fixing means for fixing the hub to the flat plate is provided. .

In a preferred embodiment, the second fixing means includes an insertion hole formed on the upper surface of the cylindrical rib for fixing the flat plate of the drive shaft to the cylindrical rib of the hub, It is provided with a fastening hole formed in the flat plate of the drive shaft that is inserted into the inside and coincides with the insertion hole, and a fixing bolt that is inserted into the insertion hole and fastened to the fastening hole.

In a preferred embodiment, a head of the fastening bolt is arc-shaped so that laundry is not hung thereon.

In a preferred embodiment, a square portion formed in the fastening bolt to prevent idling of the fastening bolt, and a coupling hole of the stirrer formed in the square hole so as to be coupled to the square portion. It is characterized by having done.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail with reference to FIGS. A stirrer 111 integrally formed with a washing wing 112 for washing laundry, which is connected to a bottom of a washing tub 102 of the washing machine 101, and is connected to a bottom of the stirrer 111 to guide washing water. The configuration includes an insulator 121 and a coupling means of a hub 131 coupled to the drive shaft 141 for transmitting the rotational force of the drive shaft 141 to the insulator 121 and the agitator 111 and coupled to the bottom of the insulator 121.

The hub connecting means is used to connect the hub 131 with the plurality of hub insertion portions 122 formed on the insulator 121 so as to connect the insulator 131 to the hub 131 at the correct position. A plurality of arms 132 formed on the hub 131; and
122 is provided with first fixing means.

The first fixing means includes an insulator 12
A hook 123 formed in a hub insertion portion 122 of an insulator 121 for fixing the hub 131 to the arm 1 and an arm 13 of the hub 131 so that the hook 123 is inserted and fixed.
2 was provided with a hook hole 133 formed.

Further, the first fixing means is provided with the stirring body 111.
A plurality of coupling holes 115 formed in the stirring body 111 for fixing the insulator 121 and the hub 131, and the coupling holes 11
Hub insertion portion 122 of insulator 121 so that it matches 5
A fixing hole 134 formed in the arm 132 of the hub 131 so as to coincide with the connecting hole 124, and a nut 153 inserted into the connecting hole 115, the connecting hole 124 and the fixing hole 134. And a fastening bolt 151 to be screwed.

The upper part of the stirring body 111 and the washing tub 102
Are joined by seaming portions 113 and 103.

The agitator 111 has a plurality of circulation holes 114 formed on the bottom surface of the agitator 111 to facilitate circulation of the washing water.

Further, the washing blade 1 formed on the stirring body 111
The inside of 12 is formed to be hollow, and the material of the stirring body 111 is made of steel.

The agitator 111 is relatively container-shaped.

Further, the insulator 121 is provided with a stirring body 111.
A plurality of reinforcing ribs 125 are formed on the insulator 121 to transmit torque to the motor or to reinforce the strength.

The material of the insulator 121 is made of synthetic resin.

Further, a through hole 126 for facilitating circulation of washing water is provided at the center of the insulator 121.

The arm 132 formed on the hub 131
Is relatively the shape of a ladder.

Also, a plurality of washing water supplied from the agitator 111 is formed on the bottom surface of the hub 131 so that water flows from the center of the washing tub 102 to the outside. 138.

Also, a radial rib 139 is formed at the center of the bottom of the hub 131 to prevent washing water from penetrating while an air gap is formed at the joint between the hub 131 and the drive shaft 141. .

In order to connect the hub 131 to the drive shaft 141, a cylindrical rib 136 protruding from the center of the hub 131 is formed.
Was provided.

The cylindrical rib 136 formed on the hub 131 has a rounding surface 137 formed on the cylindrical rib 136 to uniformly guide the washing water supplied through the guide hole 116 of the stirring body 111. Provided.

The upper surface of the cylindrical rib 136 is formed flat.

The hub 131 is made of synthetic resin.

Further, a flat plate 142 formed on the drive shaft 141 for connecting the hub 131 to the drive shaft 141 and a second fixing means for fixing the hub 131 to the flat plate 142 are provided.

The second fixing means includes an insertion hole 135 formed on the upper surface of the cylindrical rib 136 for fixing the flat plate 142 of the drive shaft 141 to the cylindrical rib 136 of the hub 131, and the cylindrical rib 136. A fastening hole 143 formed in the flat plate 142 of the drive shaft 141 which is inserted into the inside of the drive shaft 141 and coincides with the insertion hole 135;
A fixing bolt 140 is inserted into the fixing hole 35 and fastened to the fastening hole 143.

The head of the fastening bolt 151 is formed in an arc shape so that laundry is not hung.

Further, a square portion 152 formed on the fastening bolt 151 for preventing the idle rotation of the fastening bolt 151, and a coupling hole 115 of the stirring body 111 so as to be connected to the square portion 152 are formed into a square hole. It was formed.

In the drawings, reference numeral 161 denotes a bearing housing, 171 denotes an outer tub, and 181 denotes a drive motor.

The operation of the present invention as described above will be described as follows.

First, when laundry is put into the direct-type washing machine 101 and the start button is pressed, water supply to the inside of the washing tub 102 is started.

When a constant level of washing water is supplied to the washing tub 102, the supply of water is interrupted and the motor 181 operates.

The drive shaft 141 is rotated by the rotation and reverse rotation of the motor 181, and the cylindrical rib 136 is fixed to the flat plate 142 of the drive shaft 141 by the fixing bolt 140.
Also rotates.

The arm 132 of the hub 131 is inserted into the hub insertion portion 122, and the insulator 121 fixed by the hook 123 also rotates.

Further, a fastening bolt 1 is attached to the insulator 121.
The stirrer 111 fixed at 51 also rotates, and the washing tub 102 integrally fixed by the stirrer 111 and the seaming portions 113 and 113 also performs the reversing motion to wash the laundry inside.

In particular, the laundry can be more clearly washed by the washing wings 112 formed integrally with the agitator 111.

The washing water for washing the laundry in the washing tub 102 circulates to filter foreign substances such as fluff contained in the washing water.

That is, while the washing water of the washing tub 102 flows into the guide hole 116 formed at the center of the stirring body 111, the stirring body
A flow state is established between the rounding surface formed on the cylindrical rib 136 of the hub 131 and the cylindrical rib 136.

The washing water that has passed between the agitator 111 and the hub is collected by a fluff collecting device (not shown) formed between the arms 132 of the hub 131. Become.

The washing water having passed through the fluff collecting device is provided with a plurality of circulation holes 114 formed on the outer peripheral surface of the stirring body 111.
4 and supplied to the inside of the stirring body 111 again as shown in FIG.

The washing water collected on the bottom surface of the outer washing tub 171 is guided between the arms 132 of the hub 131 by the pumping action of the pumping rib 138 formed on the hub 131, and flows through the circulation hole 114 into the stirring body 111. It can be supplied to and washed.

In order to couple the hub 131 to the insulator 121 at the correct position, a plurality of arms 132 formed on the hub 131 are connected to a plurality of arms 132 formed on the hub 131 by a plurality of hub insertion portions 122 formed on the insulator 121. Because of the connection at 133, more accurate assembly work can be obtained.

Further, the agitator 111 and the insulator 12
1 and the coupling hole 1 of the stirring body 111 to fix the hub 131
15 and a connection hole 124 formed in the hub insertion portion 122 of the insulator 121 and a fixing hole 134 formed in the arm 132 of the hub 131 are fixed by the fastening bolt 151 and the nut 153, so that a very rigid assembly structure is obtained. become.

Then, the upper part of the stirring body 111 and the washing tub 1
Since the lower side of 02 is integrated by the seaming portions 113 and 103, the rotational resistance can be reduced and the load on the drive motor 181 can be reduced.

Further, since the washing water is circulated from a short distance by the plurality of circulation holes 114 formed on the bottom surface of the stirring body 111, an improved washing water circulation effect can be obtained.

The washing blade 1 formed on the stirring body 111
12 has a feature that it is light because it is formed so as to be hollow inside, and can be rotated with a small force, so that the load on the drive motor 181 can be reduced.

Further, since the material of the stirring body 111 is made of steel, the strength is increased, and an improved washing effect can be obtained by strong contact with the laundry.

Since the agitator 111 is relatively shaped like a container, it can be easily connected to the washing tub 102, and washing can be easily performed when the laundry is left.

The plurality of reinforcing ribs 125 formed on the insulator 121 are provided to transmit torque to the agitator 111 or to reinforce itself.

The injection molding is facilitated by manufacturing the insulator 121 from a synthetic resin.

The through hole 126 formed at the center of the insulator 121 is provided to allow the washing water flowing into the guide hole 116 of the agitator 111 to easily flow into the circulation hole 114 of the agitator 111. It was done.

Further, the arm 1 formed on the hub 131
The shape of 32 is made into a relatively ladder shape and the hub insertion part 12
Easy assembly into 2.

The pumping ribs 138 formed on the bottom surface of the hub 131 are formed to generate the flow of the washing water supplied from the stirring body 111 from the center of the washing tub 102 to the outside.

The radial ribs 139 formed on the hub 131 prevent the washing water from penetrating while an air gap is formed at the joint of the drive shaft 141.

The cylindrical rib 136 formed on the hub 131 is provided to connect the hub 131 to the drive shaft 141.

The rounding surface 137 formed on the outer peripheral surface of the cylindrical rib 136 is provided to uniformly guide the washing water supplied through the guide hole 116 of the stirring body 111 to the outside.

Since the upper surface of the cylindrical rib 136 is flat, the coupling of the drive shaft 141 can be facilitated.

Since the hub 131 is made of a synthetic resin material, injection molding is possible, and mass production is possible.

A flat plate 142 is also formed on the drive shaft 141 to facilitate connection with the hub 131.

An insertion hole 135 formed in the flat plate 142 of the drive shaft 141, an insertion hole 135 formed in the upper surface of the cylindrical rib 136 of the hub 131, and a fastening hole 143 formed in the flat plate 142 of the drive shaft 141. By fastening the fixing bolts 140 to the boss, a more rigid assembly structure can be obtained.

The head of the fastening bolt 151 is formed in an arc shape so that laundry is not hung.

Further, a square portion 152 is formed below the head of the fastening bolt 151, and a coupling hole 115 of the stirring body 111 is formed in the square hole so that the square portion 152 can be joined. Prevents idle rotation of

[0103]

As described above, according to the present invention, the washing water is drained to the center of the stirrer integrally connected to the washing tub and can be circulated while being supplied to the periphery of the stirrer again. A short circulation path can provide an improved washing effect, reduce wasted water, and a simple combination of the washing tub and agitator, and the insulator and the hub can provide a more washing water circulation device and reduce the number of assembly steps. It has a useful effect that can be done.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a washing water circulation device of a conventional washing machine.

FIG. 2 is a partial side view showing a discharge port of a washing water circulation device of a conventional washing machine.

FIG. 3 is a partially assembled exploded perspective view showing the configuration of the washing machine of the present invention.

FIG. 4 is a sectional view showing a combined configuration of the washing machine of the present invention.

[Explanation of symbols]

 101 Washing machine 102 Washing tub 103 Seaming part 111 Stirrer 112 Washing wing 113 Seaming part 114 Circulation hole 115 Connection hole 116 Guide hole 121 Insulator 122 Hub insertion part 123 Hook 124 Connection hole 125 Reinforcement rib 126 Through hole 131 Hub 132 Arm 133 Hook hole 134 Fixing hole 135 Insertion hole 136 Cylindrical rib 137 Rounding surface 138 Pumping rib 139 Radial rib 140 Bolt 141 Drive shaft 142 Flat plate 143 Fastening hole 151 Fastening bolt 152 Square part 153 Nut 161 Bearing housing 171 Outside washing tub 181 motor

Claims (23)

[Claims] A stirrer integrally formed with washing wings for washing laundry by being coupled to a bottom of a washing tub of a washing machine; and a stirrer coupled to a bottom of the stirrer to guide washing water. A washing water circulation device for a direct connection type washing machine, comprising: an insulator; and a hub coupling means coupled to a bottom of the insulator and coupled to transmit a rotational force of a drive shaft to the insulator and the agitator. 2. The hub connecting means includes a plurality of hub insertion portions formed on the insulator for connecting the hub to the insulator in a correct position, and a hub formed on the hub for connecting the hub to the hub insertion portion. The washing water circulation device according to claim 1, further comprising: a plurality of arms; and first fixing means for fixing the arms to the hub insertion portion. 3. The first fixing means includes a hook formed in a hub insertion portion of the insulator for fixing the hub to the insulator, and a hook hole formed in an arm of the hub so that the hook is inserted and fixed. The washing water circulation device for a directly-connected washing machine according to claim 2, wherein: 4. The first fixing means is formed in a plurality of coupling holes formed in the stirrer for fixing the stirrer, the insulator and the hub, and in the hub insertion portion so as to coincide with the coupling holes. A connection hole, a fixing hole formed in the arm of the hub so as to coincide with the connection hole, and a fastening bolt inserted into the connection hole, the connection hole and the fixing hole and screwed by a nut. The washing water circulation device for a direct connection type washing machine according to claim 1, wherein 5. The washing water circulation device for a directly-connected washing machine according to claim 1, wherein an upper portion of the agitator and a lower portion of the washing tub are connected by a seamisong portion. 6. The washing machine according to claim 1, wherein the stirrer has a plurality of circulation holes formed in a bottom surface of the stirrer to facilitate circulation of the washing water. Machine washing water circulation device. 7. The washing wing formed on the agitator has a hollow interior.
A washing water circulation device for a directly-connected washing machine according to item 1. 8. The washing water circulation device for a directly-connected washing machine according to claim 1, wherein a material of the stirrer is steel. 9. The apparatus according to claim 1, wherein the agitator has a relatively container shape. 10. The direct-type laundry according to claim 1, wherein the insulator includes a plurality of reinforcing ribs formed on the insulator to transmit torque to the agitator or to reinforce the strength of the insulator. Machine washing water circulation device. 11. The apparatus according to claim 1, wherein the insulator is made of a synthetic resin. 12. The washing water circulation device of claim 1, wherein a through hole is provided at a central portion of the insulator to facilitate circulation of the washing water. 13. The washing water circulation device for a directly-connected washing machine according to claim 2, wherein the shape of the arm formed on the hub is relatively ladder-shaped. 14. The pump according to claim 1, wherein a bottom surface of the hub is provided with a plurality of pumps formed on a bottom surface of the hub to generate a water flow from a center of the washing tub to the outside of the washing tub. The washing water circulation device for a direct connection type washing machine according to any one of claims 1, 2 and 4, wherein 15. A radial rib formed at the center of the bottom surface of the hub to prevent washing water from penetrating while an air gap is formed at the joint between the hub and the drive shaft. The washing water circulation device for a direct connection type washing machine according to any one of claims 1, 2 and 4, wherein: 16. The apparatus as claimed in claim 1, further comprising a cylindrical rib protruding from a center of the hub for connecting the hub to a drive shaft. Washing water circulation device of the direct connection type washing machine. 17. The method according to claim 17, wherein the cylindrical rib formed on the hub has a rounding surface formed on the cylindrical rib to uniformly guide the washing water supplied through the guide hole of the agitator. The washing water circulation device for a direct connection type washing machine according to any one of claims 1, 2 and 4. 18. The apparatus according to claim 1, wherein an upper surface of the cylindrical rib is a flat surface. 19. The apparatus according to claim 1, wherein a material of the hub is made of synthetic resin. 20. The apparatus according to claim 1, further comprising a flat plate formed on the drive shaft for connecting the hub to the drive shaft, and second fixing means for fixing the hub to the flat plate. Washing water circulation device of the direct connection type washing machine. 21. An insertion hole formed in the upper surface of the cylindrical rib for fixing the flat plate of the drive shaft to the cylindrical rib of the hub, and the second fixing means is inserted and inserted into the cylindrical rib. 21. The direct connection type washing machine according to claim 20, further comprising a fastening hole formed in a flat plate of the drive shaft corresponding to the hole, and a fixing bolt inserted into the insertion hole and fastened to the fastening hole. Washing water circulation device. 22. The fastening bolt according to claim 4, wherein the head has an arc shape so that laundry is not hung thereon.
A washing water circulation device for a directly-connected washing machine according to item 1. 23. A square part formed in the fastening bolt to prevent idle rotation of the fastening bolt, and a coupling hole of the agitator is formed in the square hole so as to be coupled to the square part. The washing water circulation device for a directly-connected washing machine according to claim 4.