JP2000237496A - Electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mixing of air from an overflowing water passage at drain time, and to reduce a noise at drain time of an electric washing machine by arranging a mechanism, for example, a check valve for preventing a backflow of drained water in a passage for making overflowing water flow from an outer tub. SOLUTION: At washing time, a drain valve 12 is closed by being driven by a motor, and water is gathered in an outer vessel 3. While, at dehydrating time, the drain valve 12 is opened, and the water from the outer vessel 3 is led out to the outside through a drain hose 13. By the way, a passage 14 for making water flow to the rear side of the drain valve 12 from the upper side of the outer vessel 3 is arranged in the outer tub 3 to prevent the water from wetting a floor by overflowing from the outer vessel 3. A backflow preventive mechanism 15 for preventing the water from flowing to the overflowing water passage 14 is arranged in a part for merging this overflowing water passage 14 and drained water. Mixing of air from the overflowing water passage 14 is prevented by this backflow preventive mechanism 15 to reduce noise at drain time. This backflow preventive mechanism 15 may be constituted so as to be opened and closed by a check valve and the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage mechanism for suppressing the noise generated when draining an electric washing machine.

[0002]

2. Description of the Related Art A conventional electric washing machine comprises a washing and dewatering tub having an outer frame and a stirring blade at the bottom center, an outer tub containing the washing and dewatering tub, and the outer tub suspended from the outer frame. And a vibration isolating mechanism. At the bottom of the outer tub, as shown in the figure described in P6 of July 1998, a general catalog of electric washing machines / clothes dryers by Hitachi, Ltd., water was collected in the tub. A drain valve is provided for discharging water, and a drain hose connected to the drain valve and a flow path for flowing water overflowing from the outer tank to the rear side of the drain valve are provided.

[0003]

In the above prior art, the flow path for flowing the overflow water from the outer tank has a structure in which only a hose is fitted. Therefore, the water flowing out of the drain valve at the time of drainage before dehydration or the like flows into the drainage hose and also into the overflow water channel. When there is a lot of water accumulated in the outer tank, only the water from the overflow water channel merges with the drainage, so the drainage is drained quietly. The amount of water also decreases, and air is also sucked in from the overflow water flow path and merges with the drainage while being mixed with the water. Therefore, there was a problem that noise increased.

[0004] An object of the present invention is to reduce the noise at the time of drainage.

[0005]

In order to achieve the above object, an electric washing machine according to the present invention includes an outer frame, a washing and dewatering tub having a stirring blade at the bottom center, and a washing and dewatering tub contained therein. An outer tub, a vibration isolation mechanism for suspending and supporting the outer tub to the outer frame, a drain valve provided at the bottom of the outer tub, a drain hose connected to a drain port of the drain valve, and In an electric washing machine having a flow path for flowing overflowing water to the rear side of a drain valve, a mechanism for preventing backflow of drainage is provided in a flow path for flowing overflow water from the outer tub, such as a check valve. It is in.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view of an electric washing machine according to one embodiment of the present invention. In this figure, only the basic components of the washing machine are described, and other components such as a panel switch are omitted and not shown.

FIG. 2 is a detailed cross-sectional view around a drain valve according to an embodiment of the present invention. Its main configuration is an outer frame 1 and this outer frame 1
An outer tub 3 elastically supported via a vibration isolating mechanism 2, a washing and dewatering tub 5 equipped with a fluid balancer 11 installed in the outer tub 3 and equipped with a stirring blade 4 for canceling unbalance. A flange 6 supporting the washing and dewatering tub on the clutch shaft, a clutch 7 supporting the flange 6,
A mounting plate 9 that supports the clutch 7 and the motor 8 and is held in the outer tub 3, and a pulley / belt system 10 that transmits torque between the motor 8 and the clutch 7.

The washing blade 4 is rotated by a motor 8 via a pulley / belt system 10 through a clutch 7 during washing, and the washing / dewatering tub 5 is rotated during dehydration. A drain valve 12 is provided below the outer tub 3 to store and drain water in the outer tub 3.

The drain valve 12 is driven by a motor or the like during washing and is closed, so that water can be stored in the outer tub 3. During dehydration, the drain valve 12 is driven by the motor or the like to open and discharge water from the outer tub 3. It goes out of the outer frame 1 through the drain hose 13. In order to prevent the outer tub 3 from splashing water during washing or water from overflowing from the outer tub 3 to wet the floor due to something abnormal, water is supplied from the upper side of the outer tub 3 to the rear side of the drain valve 12. Is provided with a flow path 14 that flows through the flow path. This overflow water channel 14
The drain valve 12 is connected after the drain valve 12 so that water flows even when the drain valve 12 is closed, such as during washing.

At a place where the overflow water flow path 14 and the drainage merge, a backflow prevention mechanism 15 for preventing water from flowing into the overflow water flow path 14 is provided. The backflow prevention mechanism 15 allows the normal overflow water to flow to the drain hose 13, and at the time of drainage, prevents water from entering the overflow water channel 14, and prevents air from entering from the overflow water channel 14. Can be prevented, and noise at the time of drainage can be reduced.

The backflow prevention mechanism 15 may be a mechanism that is opened and closed by a check valve or the like or a motor. FIG.
Example shown in is an example of how to attach a check valve,
When the drain valve opens and the water in the water tank is discharged, the check valve is closed by the force of the drain.

[0012]

According to the present invention, it is possible to prevent air from being mixed in from the overflow water channel at the time of drainage by providing a backflow prevention mechanism for preventing drainage from flowing into the overflow water channel. An electric washing machine with low noise can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a basic configuration of an electric washing machine according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing details around a drain valve according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer frame, 2 ... Anti-vibration mechanism, 3 ... Outer tank, 4 ... Stirring blade, 5 ...
Washing and dewatering tub, 6 flange, 7 clutch, 8 motor, 9 mounting plate, 10 pulley / belt system, 11 fluid balancer, 12 drain valve, 13 drain hose, 14
Overflow water channel, 15 ... drainage backflow prevention mechanism.

Claims (1)

[Claims] An outer frame, a washing and dewatering tub having a stirring blade at the bottom center, an outer tub containing the washing and dewatering tub, and a vibration isolating mechanism for suspending and supporting the outer tub on the outer frame. An electric washing machine having a drain valve provided at the bottom of the outer tub, a drain hose connected to a drain port of the drain valve, and a flow path for flowing water overflowing from the outer tub to the back of the drain valve. 3. The electric washing machine according to claim 1, wherein a backflow prevention mechanism for drainage is provided in the flow path through which the overflowed water flows.