JPH0399697A - Automatic washing machine - Google Patents

Abstract

PURPOSE:To reduce sliding noise and to improve durability by providing a compression spring intermediating between a spring support plane and a spring holder, said spring holder straightly molding the internal wall and a penetration orifice being provided on the upper part of said spring holder. CONSTITUTION:An external basin is protected from vibration and supported from the main body of the washing machine through a suspension 18. The suspension is constituted with a hanging pole 20, a spring holder 21, a compression spring 22, a spring support plane 23. The internal wall of the spring holder 21 is straightly molded to form a cylindrical shape. Therefore, the friction with the spring support plane 23 is extremely small. Moreover, on the upper part of the spring holder 21, a penetration orifice 24 is provided to obtain an appropriate damper force. In the centrifugal drying process in which a drying basin 16 rotates, when the localized presence of clothes in the drying basin causes an unbalance, an external basin 13 and the drying basin 16 strongly vibrate. At this time, the vibration is reduced with the damper force of an air damper constituted with the spring holder 21 and the spring support plane 23.

Description

[Detailed description of the invention] The present invention relates to an automatic washing machine for home use.

2. Description of the Related Art Conventionally, this type of automatic washing machine has a structure as shown in FIGS. 3 and 4. 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 dehydration tank 4, which is located inside the outer tank 1 and also serves as a washing tank, is fixed to the outer shaft. A stirring blade 5 located inside the dehydration tank 4 is fixed to the inner shaft. The outer tub 1 is supported by a washing machine main body 7 via a suspension 6 in a vibration-proof manner. As shown in FIG. 4, the suspension 6 is attached to a hanging rod 8, a cylindrical spring presser 9, a helical spring 10, a flexible spring support disk 11, and a spring support disk 11 at a temperature above the transformation temperature. When the temperature of It is slidably fitted into the inner periphery of the lower end of the cylindrical spring holder 9. The outer tank 1 is placed on the cylindrical spring holder 9.

It had the following configuration and automatically performed water supply, washing, drainage, and centrifugal dewatering. (Problem to be solved by the JP-A-62-17 invention Generally, in automatic washing machines, when spinning the dehydration tank 4 for centrifugal dehydration, the unbalance caused by the unevenness of the clothes causes large vibrations. occurs.

In particular, the vibration amplitude is at its maximum at startup and when passing through the resonance point. In order to suppress this resonance vibration, the cylindrical spring presser 9 mentioned above is
The spring support disk 11 is frictionally slid to damp vibrations. When the amount of friction damping is increased, the amplitude of the resonance point becomes smaller (but the vibration is more easily transmitted to the washing machine main body 7, and noise such as vibration sound and sliding sound becomes louder.On the other hand, when the amount of friction damping is small, the amplitude of the resonance point becomes smaller). becomes smaller, but the amplitude at the resonance point becomes larger. Therefore, in the conventional example described above, the cylindrical spring presser 9 and the spring support circle Sufficient damping is obtained by the friction with the plate 11, and after the rotational speed passes the resonance point, the shape memory alloy ring 12 is heated due to frictional heat and the memorized shape, that is, the ring diameter is small ( In this structure, the flexible spring support disk 11 is compressed to reduce the frictional force, thereby suppressing the noise.However, with the structure described above, the frictional force is reduced until the shape memory alloy ring 12 operates. The movement of the shape memory alloy ring 12 is large, and as a result, noise such as sliding noise is also large.Furthermore, since frictional heat is used to operate the shape memory alloy ring 12, the operation becomes unstable.
There was a problem in that the durability of the cylindrical spring presser 9 and the spring support disk 11 also deteriorated.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned conventional problems, and aims to provide an automatic washing machine that reduces friction between a spring presser and a spring support plate, reduces sliding noise, and improves durability. This is the primary purpose. Second, in relation to the first purpose, when starting dehydration, the damper is increased to reduce the vibration amplitude at the resonance point, and the point in time when steady vibration is reached is automatically determined and the damper is reduced to reduce the vibration. The objective is to obtain an automatic washing machine that reduces noise by making it difficult for the noise to be transmitted to the washing machine body.

Means for Solving the Problem The first means for achieving the above-mentioned first objective is to use an outer tub located outside the washing tub that also serves as a spin-drying tub to receive water during spin-drying through a suspension. The suspensions are elastically supported from the machine body, and each of the suspensions is supported by a suspension rod, a spring support plate attached to the lower end of the suspension rod, a spring retainer that is inserted through the suspension rod and covers the spring support plate, and the spring support. The automatic washing machine has a compression spring interposed between a plate and the spring holder, and the spring holder has a straight inner wall and a through hole in the upper part. be.

In addition to the structure of the first means, a second means for achieving the second purpose is to provide an exhaust port at the top of the spring holder, and to open and close the exhaust port using a solenoid valve. ,
The automatic washing machine is configured such that the opening and closing of the electromagnetic valve is performed by a control circuit that processes signals from an acceleration sensor provided in the outer tub.

Function: The first means functions as follows. The inner wall of the spring holder is molded straight to reduce the friction between the spring support plate and the spring holder, and a through hole is provided at the top of the spring holder, so the friction between the spring support plate and the spring holder is reduced by sliding. range, and the fricative noise is reduced.

Furthermore, since the friction is reduced, the durability of the spring support plate and the spring presser can also be improved.

The second method is to use a solenoid valve to close the exhaust port and increase the damper until the dehydration tank begins to rotate and passes the resonance point during the dehydration process, and an acceleration sensor detects when the dehydration tank has passed the resonance point. At that point, the solenoid valve is opened and the bumper is made smaller, which can reduce the noise.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Figure 1, outer tank 1 for receiving water during dehydration
A reducer] 4 is fixed to the bottom of 3, and this reducer 1
4 is connected by a belt to a motor 15 fixed to the lower part of the outer tank 13. The drive shaft of the reducer 14 has a double structure, and a dehydration tank 16, which is located inside the outer tank 13 and also serves as a washing tank, is fixed to the outer shaft. On the inner axis,
A stirring blade 17 located inside the dehydration tank 16 is fixed. The outer tub 13 is connected to the washing machine main body 1 via a suspension 18.
It is supported by anti-vibration from 9. The suspension 18 is the second
As shown in the figure, it is composed of a hanging rod 20, a spring presser 21, a compression spring 22, and a spring support plate 23. The inner diameter of the spring presser 21 has a relationship of =D2, in other words, the inner wall is formed straight and has a cylindrical shape. Therefore, the friction with the spring support plate 23 is extremely small. Further, the upper part of the spring presser 21 is provided with a through hole 24 for obtaining a suitable damper and an exhaust port 25 for switching the damper by opening and closing. 26 is an acceleration sensor attached to the outer tank 13, and the control circuit 2 detects the magnitude of vibration of the outer tank 13.
Tell 7.

When the control circuit 27 receives a signal from the acceleration sensor 26, it opens and closes the solenoid valve 28 and opens and closes the exhaust port 25. 29 is
Ji connecting the exhaust port 25 and the solenoid valve 28. - It's true.

The operation of this embodiment will be explained below. During the centrifugal dehydration process in which the dehydration tank 16 rotates, if an imbalance occurs due to unevenness of clothing, etc., the outer tank] 3 and the dehydration tank 16 vibrate violently. Particularly at startup, the amplitude reaches its maximum when passing through the resonance point. The vibration isolation mechanism of this embodiment dampens vibrations by using a damper of an air damper composed of a spring presser 21 and a spring support plate 23 so that the outer tub 13 and the like do not come into contact with the washing machine main body 19 at this peak time. There is. When it passes through the resonance point and becomes steady rotation, the acceleration sensor 2
6 detects this and transmits this signal to the control circuit 27. In response to this signal, the control circuit 27 opens the solenoid valve 28 (as a result, air leaks from the exhaust 1'' 25, the damper of the air damper becomes smaller, vibrations transmitted to the washing machine body 19 are damped, and noise is reduced. reduced.

As described above, according to the automatic washing machine of the embodiment of the present invention, the inner wall of the spring retainer 21 is formed straight and the through hole 24 is provided in the upper part of the spring retainer 21, thereby reducing the friction of the spring support plate 23. Since this is made smaller, the noise caused by frictional noise during the dehydration process is reduced. Since the friction is small, the durability of the spring presser 21 and the spring support plate 23 is improved. Also,
An exhaust hole is provided in the upper part of the spring presser 21, an acceleration sensor 26 is provided in the outer tank 13, and this signal is transmitted to the control circuit 27.
By configuring the control circuit 27 to open and close the electromagnetic valve 28, it is possible to increase the damper to reduce vibrations when starting dewatering, and to reduce noise by opening the exhaust port 25 and reducing the damper during normal operation.

Effects of the Invention The first means is that the inner wall of the spring holder is formed straight to reduce the friction between the spring support plate and the spring holder, and a through hole is provided in the second part of the spring holder. The friction between the spring support plate and the spring presser is reduced in the sliding range, and frictional noise is reduced. Therefore, the durability of the spring support plate and the spring presser can be increased. According to the second means, an exhaust port is provided in the upper part of the spring holder, and the exhaust port can be opened and closed using a solenoid valve, and the opening and closing of the solenoid valve is controlled by an acceleration sensor provided in the outer tank. By configuring the control circuit that processes the signal to do this, the solenoid valve closes the exhaust port and increases the damper, until the dehydration tank starts rotating and passes the resonance point during the dehydration process, and the resonance point is When the acceleration sensor detects that the machine has passed, the solenoid valve is opened and the bumper is made smaller, reducing noise. This makes it possible to provide a low-noise, highly durable automatic washing machine. .

[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. FIG. 3 is a sectional view showing the suspension. 13...Outer tank, ]6...Dehydration tank, 18...Suspension, 19...Washing machine main body, 20...Hanging rod,
21... Spring holder, 22... Compression spring, 23...
Spring support plate, 24... Through hole, 25... Exhaust port, 2
6... Acceleration sensor, 27... Control circuit, 28...
·solenoid valve. Name of agent: Patent attorney Shigetaka Awano and 1 other person
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Claims (2)

[Claims] (1) The outer tank, which is located outside the washing tub that also serves as a spin-drying tank and receives water during spin-drying, is elastically supported from the washing machine main body via a suspension, and each of the suspensions is connected to a hanging rod and the hanging rod. a spring support plate attached to the lower end of the suspension rod, a spring presser that is inserted through the hanging rod and covers the spring support plate, and a compression spring interposed between the spring support plate and the spring presser; An automatic washing machine in which the inner wall of the spring holder is formed straight to reduce friction between the spring support plate and the spring holder, and a through hole is provided in the upper part of the spring holder to form an air damper. (2) An exhaust port is provided at the top of the spring holder, and the exhaust port can be opened and closed using a solenoid valve, and the opening and closing of the solenoid valve is controlled by a control circuit that processes signals from an acceleration sensor installed in the outer tank. The automatic washing machine according to claim (1), wherein: