JPS6012541Y2 - Backflow prevention device for drum type washing machines - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drum-type washing machine that includes a drum rotatably supported by a horizontal shaft and a receiving tank that houses the drum. In particular, the invention relates to a drum-type washing machine that performs washing, rinsing, etc. within the drum. The present invention relates to an improvement of a backflow prevention device that prevents foam, etc. from flowing back into the water supply side.

In conventional drum-type washing machines of this type, washing, rinsing, and dewatering are performed within the drum, so the series of processes are generally automated.

Therefore, the faucet is left open during operation, and a solenoid valve is installed between the faucet and the water tank to control the water supply.

However, although electric valves can control water supply when pressure is applied from the faucet side, they cannot control water supply when the faucet side becomes negative pressure.
If bubbles generated during washing are near the water supply port, the bubbles will be absorbed and flow back into the water pipe.

The present invention eliminates the above-mentioned conventional drawbacks by providing a check valve between the electromagnetic valve and the receiving tank, and an embodiment thereof will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a cylindrical drum, which has a plurality of substantially mountain-shaped baffles 2 on its circumferential inner wall.

3 is a receiving tank that houses the drum 1, has a cylindrical water supply port 4 at the top, a cylindrical drainage port 5 at the bottom, and a suspension 6.
It is attached to the outer frame 7 by.

8 is a valve holder connected to the upper part of the water supply port 4, and its upper part and lower part have different diameters. ing.

The water supply port 4 is inserted into the opening 10 of the large-diameter cylindrical portion 9.

Further, an external opening 12 of the small-diameter cylindrical portion 11 is connected to a solenoid valve 14 via a water supply pipe 13.

Reference numeral 15 is a stepped portion provided within the cylindrical portion 9. Reference numeral 16 denotes a check valve which is sheet-like and approximately in the shape of a canopy, and has a hinge part 17 at its constricted part. A fixing part 19 having substantially the same shape as the opening 10 of the cylindrical part 9 is provided, and is fixed between the upper end of the water supply port 4 and the stepped part 15 in the cylindrical part 9.

Further, the other end of the check valve 16 has a substantially hemispherical convex portion 20 at approximately the center thereof;

This convex portion 20 is bent with respect to the fixed portion 19 with the hinge portion 17 as a boundary, and is urged by the restoring force of the hinge portion 17 so as to come into pressure contact with the internal opening edge portion 21 of the cylindrical portion 11. .

The convex portion 20 protrudes toward the internal lower edge portion 21, and its outer diameter is smaller than the outer diameter of the fixing portion 19 so that the hole 18 will not be blocked even if the two overlap.

A housing 23 is attached to the rear wall of the receiving tank 3, has a bearing 24 inside, and rotatably supports a shaft 25 positioned in the horizontal direction.

One end of this shaft 25 is attached to the drum 1 via a washer 26, and a drum pulley 27 is attached to the other end.

That is, the drum 1 is rotatably supported by a horizontal shaft.

28 is a cover attached to the washer 26.

29 is a motor pulley, and via a belt 30,
It is connected to a drum pulley 27.

31 is a motor.

32 is a seal gasket that elastically connects the front opening 33 of the receiving tank 3 and the input port 34 of the outer frame 7, 35 is a lid, 36 is a drain pipe, and 37 is a leg.

In the above configuration, when water is supplied, the solenoid valve 14 operates,
Water enters the cylindrical part 11 through the water supply pipe 13, but at this time, the convex part 20 of the check valve 16 is pressed by the water pressure, opens the internal opening 22 of the cylindrical part 11, and the water enters the cylindrical part 11. 16 holes 18
, passes through the inside of the cylindrical portion 9 and flows into the receiving tank 3 .

When the water supply is finished and the solenoid valve 14 is turned off, the cylindrical part 1
The water pressure inside the check valve 16 is reduced, and the repulsive force of the hinge portion 17 causes the convex portion 20 of the check valve 16 to come into pressure contact with the internal opening edge portion 21 .

Therefore, even if the bubbles generated during the next wash are near the water inlet 4, the negative pressure on the faucet side prevents the bubbles from flowing backwards, and furthermore, the bubbles pass through the water inlet 4 into the cylindrical part 9. Even if it enters, it cannot enter into the cylindrical portion 11, so there will be no backflow.

As described above, according to the present invention, even if the water supply source, for example, the faucet side, becomes negative pressure, it is possible to reliably prevent the occurrence of inconveniences such as bubbles in the receiving tank flowing back into the water pipe side. ,
It is only necessary to provide a check valve with a simple structure, and the assembly can be simplified and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a washing machine showing an embodiment of the present invention.
FIG. 2 is a vertical front view of the check valve, FIG. 3 is an enlarged cross-sectional view showing the backflow prevention structure, FIG. 4 is a bottom view of the valve holder, and FIG. 5 is a perspective view of the appearance of the check valve. 1...Drum, 3...Receiver, 4.Song...
Water supply port, 8... Valve holder, 9, 11...
Cylinder part, 10... Opening part, 12... External opening part, 16... Check valve, 17... Hinge part, 18...・・Hole, 20・Curve・Protrusion, 21・
...Internal opening edge.

Claims (1)

[Scope of utility model registration request] It has a drum rotatably supported by a horizontal shaft, a tank housing the drum, a water supply port provided at the top of the tank, and a cylindrical portion with different diameters, and the cylindrical portion with the larger diameter is connected to the water supply tank. With a valve holder attached to the mouth and a sheet,
It is approximately in the shape of a canopy, and has a hinge part at its constricted part, and a fixing part with a water passage hole formed on one end side of the hinge part as a border, and a fixing part with a water passage hole formed on the other end side. A check valve is provided with a convex portion corresponding to the internal opening edge portion of the cylindrical portion, and the check valve is bent at the hinge portion and its fixed portion is sandwiched between the water supply port and the valve holder. fixed,
On the other hand, the convex part is pressed against the internal opening edge part by the restoring force of the hinge part, and is formed into a substantially hemispherical shape so that the internal opening edge part side is convex.