JPS6022949Y2 - Washing machine water level control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a washing machine equipped with a water level control device.

Conventionally, in a washing machine, a water receiving tank placed outside the washing and dehydrating tub is partially formed with the outer shell, and the washing and dehydrating tub and an agitation blade provided in the center of the tub oscillate during washing.
During drainage or dewatering, the tank body itself is rotated, and the water inside is shaken off by centrifugal force and drained to the outside through a drain port provided in the water receiving tank.

However, in this case, since the tank itself rotates, there is a problem with the method of sensing the water level using an air trap and interlocking a solenoid valve to stop the water supply when the water level reaches a predetermined water level that activates the pressure switch. This is difficult in practice.

For this reason, a method has recently been adopted in which water leaks from a leak hole formed on the upper side of the tank and detects the water surface. However, it is difficult to set the water level in multiple stages, and cleaning fluid leaks during cleaning. There are some drawbacks.

Another method has been adopted in which water is introduced into the dehydration shaft, a water passage hole is provided in a part of the dehydration shaft, and a detection port linked to the air trap is provided on the outside of the water passage hole. In this case, although the above-mentioned drawbacks have been improved, there is a problem that a water stop valve or the like is required and the structure becomes complicated.

The present invention was developed in view of the above points, and a double air trap is provided at the bottom of the dehydration tank to prevent water from entering to the top, and the air pressure sensed by this air trap is To provide a dehydrating washing machine which does not require a water stop valve, prevents washing liquid from leaking, and can be easily set to multiple water levels by being taken out from a dehydrating shaft.

An embodiment of the present invention will be described below based on the drawings.

The figure is a cross-sectional configuration diagram of a washing machine showing an embodiment of the present invention.

In the figure, 1 is a dewatering/washing tub having an agitating blade IA in the center, and IB is a water hole formed at the bottom of the agitating blade IA.

Reference numeral 2 denotes an air trap composed of an outer case 2A having an opening at the bottom and an inner case 2B having an opening at the top.

2D is a structure in which the outer case 2A is fixed to the inner case 2B.

Numeral 3 is a nut that fixes the dewatering shaft 4 and the tank mounting plate 5.

The dewatering shaft 4 has a cylindrical portion 4A for sealing the air trap 2 and introducing air pressure inside the air trap 2, and a vent hole 4B communicating with the pressure receiving portion 12 at the upper portion.

The tank mounting plate 5 is fixed to the dewatering shaft 4 and also seals the tank 1.

6 is a sealing member that seals the bearing portion 8 and the dewatering shaft 4; 7 is a sealing member that seals the bearing portion 8 and the water tank; 10;
11 is a seal member that seals the bearing portion 8 and the pressure receiving portion 12; and the pressure receiving portion 12 is a water level detection port 12A to which a pressure pipe with a pressure switch 15 attached at the tip is attached. has.

13 is a sealing member for sealing the pressure receiving part 12 and the dewatering shaft 4; 16 is a water supply solenoid valve;
5, the current supply is stopped.

Next, an embodiment of the present invention having the above-described configuration will be described.

When electricity is first turned on, the water supply solenoid valve 16 opens.
Water is injected into the washing and dewatering tank 1, and the stirring blade IA flows through the water hole IB.
It also flows inside.

As the water level in the tank 1 rises, the water level in the air trap 2 also rises, so the air in the air trap 2 becomes pressurized.

The water in the air trap 2 is maintained so that it never exceeds the opening of the inner seal 2B even when the water is injected to the highest water level among the water levels set in the washing/dehydration tank 1 as shown in the figure. has been done.

Then, the air pressure that has received the water pressure passes through the inner seal and the cylindrical part 4A of the dehydration shaft 4 from the air trap 2, and passes through the ventilation hole 4B.
Pressure is guided from the to the pressure receiving part 12.

The pressure receiving part 12 has a water level detection port 1 that communicates with a pressure switch 15 through a pressure guiding pipe 14 through seal members 6, 11, and 13.
All except 2A are sealed.

As mentioned above, the air pressure that has received the water pressure activates the pressure switch 15 attached to the tip of the pressure guiding pipe 14, and although not shown, this pressure switch 15 cuts off the electricity to the water supply solenoid valve 16. to stop the water supply.

Thereafter, although not shown, a driving electric motor is driven and washing is started.

Incidentally, during draining and dewatering, the washing/dehydration tank 1 rotates and water is drained into the water receiving tank 9 inside the tank, and even if the air trap 2 is released from water pressure, no inconvenience will occur.

Although the seal member 11 seals the bearing portion 8 and the pressure receiving portion 12, it is also possible to seal the dehydration shaft 4 and the pressure receiving portion 12.

As explained above, according to the present invention, the upper end of the dehydration shaft faces the inside of the stirring blade, and the inside of the stirring blade is provided with an air trap that communicates with the inside of the washing/dehydration tank. By forming a passage inside the dehydration shaft that guides changes in air pressure inside the machine to the water supply control pressure switch, air traps etc. do not get in the way during washing, and there is no need for a drain valve or complicated waterway. .

Therefore, it is possible to provide a highly practical water level control device that has a simple structure and can control a water supply solenoid valve by reliably detecting water pressure and operating a pressure switch.

[Brief explanation of the drawing]

The figure is a cross-sectional configuration diagram of a washing machine showing an embodiment of the present invention, in which 1 is a washing and dehydrating tank, 2 is an air trap, 4 is a dehydrating shaft, 4A is a cylindrical part of the dehydrating shaft, 4B is a ventilation hole, 14 is a pressure guiding pipe, 15 is a pressure switch, and 16 is a water supply solenoid valve.

Claims (1)

[Scope of utility model registration request] In a washing machine that is provided with a washing and dehydrating tank having a stirring blade in the center and washing by swinging this dehydrating tank together with the stirring blade,
The bottom of the washing and dehydrating tank is fixed to the upper end of the dehydrating shaft, and the upper end of the dehydrating shaft is exposed to the inside of the stirring blade, and an air trap is provided inside the stirring blade to communicate with the inside of the washing and dehydrating tank. A passage that guides air pressure changes in the air trap due to changes in water level in the dewatering tank to the water supply control pressure switch.
A water level control device for a washing machine, characterized in that it is formed within the dehydration shaft.