JPH03106394A - Automatic washing machine - Google Patents

Abstract

PURPOSE:To reduce vibration and noise and improve durability by increasing a braking force in the start of dehydration and reducing the braking force in the stationary rotation in an automatic washing machine. CONSTITUTION:The upper exhaust ports 24, 30 and lower parts 29, 25 of suspensions 18, 32 disposed diagonally are connected to each other by tubes 27a, 27b, so that vibrations can be attenuated. That is, the amplitude is maximized in the resonance and the slide width of a spring support plate 23 constituting one suspension is maximized. Air in a spring holder 21 is exhausted from the upper exhaust port 24 by the slide of the spring support plate 23. Air introduced from the lower exhaust port 29 restrains the slide of a spring support plate 31 and acts as a reaction to restrain the slide of the spring support plate 23. Thus, the vibrations can be prevented effectively by utilizing the air generated in the vibrations for a damper action.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibration isolating device used in household automatic washing machines.

2. Description of the Related Art Conventionally, this type of automatic washing machine has a structure as shown in FIG. That is, a reducer 2 is fixed to the lower part of an outer tank 1 for receiving water during dehydration, and this reducer 2 is connected to a motor 3 fixed to the lower part of the outer tank 1 by a belt. The drive shaft of the reducer 2 has a double structure, and a washing tub 4, which is located inside the outer tub 1 and also serves as a dehydration tub, is fixed to the outer shaft. A stirring blade 5 located inside the washing tub 4 is fixed to the inner shaft. The outer tub 1 is vibration-proofly supported from the four corners of the washing machine main body 7 via a suspension 6. As shown in FIG. 4, the suspension 6 is attached to a hanging rod 8, a spring presser 9, a helical spring 10, a flexible spring support disk 11, and a spring support disk 11, and is heated to a high temperature above the transformation temperature. The shape memory alloy ring 12 functions to reduce the diameter of the spring support disk 11 to reduce the friction with the cylindrical spring presser 9. The spring support disk 11 is slidably fitted to the inner periphery of the lower end of the cylindrical spring presser 9. Cylindrical spring presser 9
The outer tank 1 is placed therein.

With the above configuration, water supply, washing, drainage, and centrifugal dehydration were automatically performed. (Unexamined Japanese Patent Publication No. 62-170294
) Problems to be Solved by the Invention In general, in automatic washing machines, large vibrations occur due to the unbalance caused by the unevenness of the clothes when rotating the dehydration tank 4 for centrifugal dehydration.

Especially at startup, the vibration amplitude reaches its maximum when passing through the resonance point. In order to suppress this resonance vibration, in the conventional structure described above, the spring presser 9 and the spring support disk 11 are frictionally slid to attenuate the vibration.

If the amount of friction damping is increased, the amplitude at the resonance point will be reduced, but the vibration will be more easily transmitted to the washing machine main body 7, and noise such as vibration sound and sliding sound will become larger.

Conversely, if the amount of friction damping is small, the noise will be small, but the amplitude at the resonance point will be large. Therefore, in the conventional example described above, until the dehydration tank 4 begins to rotate and passes through the resonance point in the dehydration process, a sufficient amount of damping is obtained by the friction between the spring presser 9 and the spring support disk 11, and then the rotation After the number passes through the resonance point, the shape memory alloy ring 12 is heated due to frictional heat and has a memorized shape, that is, the ring diameter becomes smaller and the flexible spring support disk 11 is compressed. As a result, the frictional force was reduced and noise was kept to a minimum.

However, in the conventional structure, the frictional force is large until the shape memory alloy ring 12 operates, which causes large noise such as sliding noise, and frictional heat is used for the operation of the shape memory alloy ring 12. Therefore, this operation was unstable. In addition, the spring presser 9 and the spring support disk l
There was a problem that the durability of No. 1 also deteriorated.

SUMMARY OF THE INVENTION The present invention aims to solve the problems of the conventional structure described above, and aims to provide an automatic washing machine that reduces vibration during the dehydration process and improves durability. It is.

Means for Solving the Problems In order to achieve the above objects, the present invention provides an outer tank located outside the washing tub which also serves as a spin-drying tank 3 to receive water during spin-drying, and an outer tank that is connected to the main body of the washing machine. and a suspension that elastically supports from the four corners of the suspension, each suspension having:
A hanging rod, a spring support plate attached to the lower end of the hanging rod, a spring holder that is inserted through the hanging rod and covers the spring support plate and has a straight inner diameter and an upper exhaust hole, and a spring support plate. It consists of a compression spring interposed between a spring holder and a bottom plate with a lower exhaust port that seals the bottom surface, and the upper and lower exhaust ports of diagonally located suspensions are connected. It is an automatic washing machine.

Action Until the dewatering process begins and the dehydration tank begins to rotate and passes the resonance point, the amount of sliding of the spring support plate is large, and the air flow inside the spring holder suppresses the sliding of the spring support plate located diagonally. ,
As a result, the damper is made larger and the vibration at the resonance point is reduced. In addition, in steady state, the amount of sliding of the spring support plate is small, and the force that suppresses the sliding of the diagonally located spring support plate due to the air flow in the spring holder is also small, so the damper becomes smaller and noise is reduced. becomes smaller. Furthermore, since the frictional force between the spring support plate and the spring presser is reduced, the durability of the spring support plate and the spring presser is also improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. A speed reducer 14 is installed in the F part of the outer tank 13 located outside the washing tank 16 which also serves as a dehydration tank to receive water during dehydration.
is fixed. This speed reducer 14 is connected by a belt to a motor 15 fixed to the lower part of the outer tank 13. The drive shaft of reducer l4 has a double structure, and the outer shaft has washing tub 1 located inside outer tub l3 and also serving as a spin-drying tub.
6 is fixed. A stirring blade 17 located inside the washing tub 16 is fixed to the inner shaft. The outer tub 13 is vibration-proofly supported from the four corners of the washing machine main body 19 via a suspension 18. As shown in FIG. 2, the suspension l8 includes a hanging rod 20, a cylindrical spring retainer 21, and a compression spring 2.
2, a spring support plate 23, and a bottom plate 26 that seals the bottom of the spring presser 2l. As shown in the figure, the inner wall of the spring retainer 21 has an inner diameter D1 and a
It is formed straight so that the relationship D,=D2, and therefore the frictional force with the spring support plate 23 is small. In addition, on the top of the spring presser 21,
An upper exhaust port 24 is provided.

Further, the bottom plate 26 is provided with a lower exhaust port 25. 2
7a is a tube that connects the upper exhaust port and the lower exhaust port of diagonally located suspensions among the suspensions disposed at the four corners of the washing machine main body 19. In this embodiment, a lower exhaust port 25 of a bottom plate 26 that seals the bottom of the suspension 21 is connected to an upper exhaust port 30 of a suspension 32 diagonally arranged thereto. 27b is a tube connecting the lower exhaust port 25 and the upper exhaust port 30 of the two suspensions, which are also arranged diagonally.

The operation of this embodiment will be explained below. During the centrifugal dewatering process in which the washing tub 16 rotates, if an imbalance occurs due to unevenness of clothes, etc., the outer tub 13 and the washing tub 16 vibrate violently. Especially when starting, the amplitude reaches its maximum when passing through the resonance point. In this example, the upper exhaust ports 24 and 30 and the lower parts 29 and 25 of the suspensions arranged diagonally are
Since these are connected by tubes 27a and 27b, this vibration can be damped. That is, at the time of resonance, the amplitude is maximum, the sliding width of the spring support plate 23 that constitutes one suspension is the maximum, and the sliding of the spring support plate 23 causes the spring presser 2 to
The air inside 1 is exhausted from the upper exhaust port 24. This discharged air flows through the tube 27a into the lower exhaust 029 of the suspension 32 arranged diagonally. At this time, the movement of the suspension 32 is opposite, so
The air flowing in from the lower exhaust port b29 acts to suppress the sliding of the spring support plate 3l, and as a reaction, the spring support plate 23
It acts to suppress the sliding of. When the vibration occurs in the opposite direction, the air discharged from the lower exhaust port 29 of the suspension 32 flows into the upper exhaust port 24 of the suspension 18 through the tube 27b. The lower exhaust ports 25 and upper exhaust ports 30, and the lower exhaust ports 29 and upper exhaust ports 24 of the suspensions 18 and 32, which are arranged diagonally in this way, are connected by tubes 27a and 27b to prevent vibrations that occur when vibration occurs. This automatic washing machine is capable of effective vibration isolation by using the damp air as a damper. Therefore, the spring support plate 2
The sliding width of 3. is small and the braking force due to the airflow is also reduced, reducing vibrations transmitted to the washing machine main body 19 and reducing noise.

As described above, according to the automatic washing machine of the embodiment of the present invention, since the friction between the spring presser 21 and the spring support plate 23 is reduced, noise caused by frictional noise during the spin-drying process is reduced. Since the friction is small, the durability of the spring presser 21 and the spring support plate 23 is improved. Furthermore, since the braking force is increased when the amplitude at the start of dehydration is large to reduce vibrations, and the braking force is decreased during steady state, noise can be reduced.

8. Effects of the Invention As described above, the present invention includes an outer tub located outside the washing tub that also serves as a spin-drying tub to receive water during spin-drying, and an outer tub that is elastically supported from the four corners of the washing machine main body. Each suspension includes a suspension rod, a spring support plate attached to the lower end of the suspension rod, and an upper exhaust port that is inserted through the suspension rod and covers the spring support plate, and that is molded with a straight inner diameter and has an upper exhaust port. A compression spring is interposed between the spring support plate and the spring holder, and a bottom plate has a lower exhaust U that seals the bottom surface. By connecting the lower exhaust port to the automatic washing machine, the braking force increases when starting dehydration, and decreases during steady rotation, resulting in a low-noise and highly durable automatic washing machine. machine can be provided.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an automatic washing machine showing an embodiment of the present invention, Fig. 2 is a sectional view of the same suspension, Fig. 3 is a sectional view of a conventional automatic washing machine, and Fig. 4 is the same suspension. FIG. 13...Outer tank, 16...Washing tub, 18.32...
Suspension, l9... Washing machine body, 20... Hanging rod, 21, 28... Spring holder, 22... Compression spring, 23... Spring support plate, 24, 30... Upper exhaust port , 25・29...Lower exhaust port, 26...Bottom plate, 27
a.27b...Tube.

Claims (1)

[Claims] It is equipped with an outer tub located outside the washing tub that also serves as a spin-drying tub to receive water during spin-drying, and suspensions that elastically support this outer tub from the four corners of the washing machine body. , a spring support plate attached to the lower end of the hanging rod, a spring holder that is inserted through the hanging rod and covers the spring support plate and has a straight inner diameter and an upper exhaust port, and the spring support plate and the spring holder. An automatic washing machine consisting of a compression spring interposed between and a bottom plate having a lower exhaust port that seals the bottom surface, and connecting the upper and lower exhaust ports of diagonally located suspensions.