JPS6228300Y2 - - Google Patents

Description

[Detailed description of the invention] In this invention, an inner tank is rotatably mounted inside an outer tank, a pulsator is arranged on the inner bottom surface of the inner tank, washing is performed by the rotation of the pulsator, and dehydration is performed by rotating the inner tank. , relates to a so-called fully automatic washing machine, and in particular to a washing machine that collects and removes lint in the water by sending water in the outer tank through a filter into the inner tank by the pump action on the back of the pulsator during washing. .

Generally, in this type of washing machine, when the pulsator starts driving during washing, water in the outer tank is sucked up into the inner tank by the pumping action of the pulsator, and the water level in the outer tank is temporarily lowered. Then, due to the water level difference between the outer tank and the inner tank, the water in the inner tank flows into the outer tank through the small holes in the side wall, causing the water level in the outer tank to rise and the pumping action to continue. However, it will eventually stabilize. During such operations, if the water level in the outer tank drops too much and temporarily drops below the reset point of the water level switch,
The water level switch switches from the No contact to the Nc contact, causing the inconvenience of interrupting the washing operation and unnecessary water supply.

This proposal was made in view of these points,
Embodiments of the present invention shown in the drawings will be described in detail below.

First, in FIGS. 1 and 2, 1 is the outer casing of the washing machine, 2 is the top plate, 3 is the operation panel section, and 4 is a conventionally known vibration-proof support mechanism 5 in the outer casing 1. An outer tank 6 is elastically suspended and supported, and an inner tank 6 serves as a washing and dehydrating tank, and has a large number of small holes 7 in the side wall.
A recess 8 is formed in the center of the inner bottom surface. Reference numeral 9 denotes a dewatering flange which is fixed to the inner tank 6 and forms a part of the bottom wall of the tank 6 and also forms the bottom surface of the recess 8. By fixing it to the upper end of the hollow shaft 10, the inner tank 6 can be connected to the outer tank 4. Rotatably mounted inside. 11 is a suction port provided on the bottom surface of the recess 8, that is, the dewatering flange 9; 12 is a discharge port provided on the side surface of the recess 8; the discharge port 12 is formed by a cover described later. 13 is a screw 14 on the inner bottom surface of the inner tank 6.
A discharge port 12 and a water channel 15 connected thereto are formed between the cover attached to the inner bottom surface of the inner tank 6 and the end of the water channel 15 opens into the inner tank 6.
Reference numeral 16 denotes a lint filter detachably disposed at the opening of the water channel 15 by appropriate means. The suction port 11 and the discharge port 12 are spaced apart from each other by 180 degrees, and the reason for this will be described in detail later.

Reference numeral 17 indicates a rotating shaft which is rotatably inserted into and supported by the hollow shaft 10, and 18 is located within the recess 8 of the inner tank 6 and is connected to the rotating shaft 1.
The pulsator is attached to the upper end of the pulsator 7 and has a reinforcing rib 19 on the back surface, and the rib 19 exerts a pumping action. Reference numeral 20 is a motor for washing and dewatering, which uses a well-known clutch mechanism to operate the inner tub 6.
Alternatively, the pulsator 18 is rotated. Above motor 2
0 drives the pulsator 18 in reverse during washing and rinsing by repeating, for example, 27 seconds of clockwise rotation, 3 seconds of rest, 27 seconds of counterclockwise rotation, and 3 seconds of rest. 21 is outer tank 4
The air trap is opened at the inner bottom of the outer tank 4 and communicates with the air intake port of the water level switch 23 via the pressure guiding pipe 22, thereby transmitting pressure fluctuations caused by changes in the water level in the outer tank 4 to the water level switch 23. When the water level in the outer tub 4 reaches a predetermined water level (trip point), the water level switch 23 switches from the Nc contact to the No contact to stop the water supply and shift to a washing or rinsing operation.

In the above configuration, water is being supplied to the outer tank 4 including the inner tank 6, and when the water level reaches a predetermined water level, the water level switch 23 switches from the Nc contact to the No contact, stopping the water supply and starting the washing operation. Transition.
During this washing, the pulsator 18 is
The inner tank 6 is rotated left and right by the
While washing is carried out by stirring the water inside, the water in the outer tank 4 is sucked up through the suction port 11 by the pumping action of the ribs 19 on the back surface, and this water is sent to the discharge port 1.
2. Inner tank 6 from water channel 15 through filter 16
By sending the lint into the water, the filter 16 collects and removes the lint in the water, thereby preventing it from re-adhering to the laundry.

Here, changes in the water levels in the outer tank 4 and the inner tank 6 due to the rotation of the pulsator 18 will be explained. When the pulsator 18 is stopped, the water level in the outer tank 4 and the inner tank 6 is the same, and when the pulsator 18 is rotated now, the water in the outer tank 4 is sucked up into the inner tank 6 by the pump action on the back side. At the beginning of the rotational drive of the pulsator 18, the water level in the outer tank 4 temporarily decreases and the water level in the inner tank 6 rises, as shown in FIG. 3a. However, due to the water level difference between the outer tank 4 and the inner tank 6, the water in the inner tank 6 flows out into the outer tank 4 through the small hole 7, so the water level in the inner tank 6 decreases, and the water level in the outer tank 4 decreases. will rise, and eventually the two water levels will become equal and stable, as shown in Figure 3b.

In such a washing machine, the present invention connects the suction port 11 and the discharge port 12 with a pulsator 18 as shown in FIG. 4c.
By arranging the rotating shafts 17 at opposite positions, the drop in the water level in the outer tank 4 is suppressed to a small level at the beginning of the drive of the pulsator 18, and the water level can always be kept above the reset point of the water level switch 23. It has the following characteristics. 4a and 4b are diagrams showing the positional relationship between the suction port 11 and the discharge port 12 in the prior art, and FIG. 4a is a diagram in which four suction ports 11 are provided at equal intervals around the rotating shaft 17. , 4th
In FIG. b, one suction port 11 is provided near the discharge port 12. Next, FIG. 5 is a diagram showing changes in the water level of the water level switch during washing operation, and a
4A shows the conventional method, FIG. 4B shows the conventional method, and FIG. 4C shows the conventional method shown in FIG. 4C.

As is clear from FIG. 5, according to the present invention, the water level is lowest at point P ₁ or P ₂ at the beginning of driving of the pulsator 18, but the water level is higher than the reset point, and therefore the water level switch 23
does not switch from No contact to Nc contact.
In contrast, in the conventional system, the water level drops below the reset point, although temporarily before and after the _P1 or _P2 point, and the water level switch 23 switches from the No contact to the Nc contact. This results in inconveniences such as interruption of operation and unnecessary water supply. This is because the distance between the suction port 11 and the discharge port 12 is large in the proposed device, and the flow resistance between them is large, whereas in the conventional device, the distance between the suction port 11 and the discharge port 12 is large.
It is thought that this is because the suction port 11 is located near the , and the water flows too smoothly.

In the present invention, the suction port and the discharge port may be provided at opposing positions with the rotation axis of the pulsator as a boundary, and there is no particular need for them to be located 180 degrees apart from each other around the rotation axis.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can of course be implemented with appropriate modifications within the scope of the invention.

As described above, in the present invention, the drop in the water level at the beginning of the pulsator drive can be suppressed to a small level due to the positional relationship between the suction port and the discharge port, and resetting of the water level switch can be reliably prevented, resulting in interruption of the washing operation and unnecessary interruption of the washing operation. This eliminates inconveniences such as insufficient water supply.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional configuration explanatory diagram of the washing machine of the present invention, Figure 2 is an enlarged sectional view showing the main parts of the same, Figures 3 a and b
4 is an explanatory diagram showing changes in water level during washing operation, and Figure 4 a, b, and c are diagrams showing the positional relationship between the suction port and the discharge port, where a and b are conventional ones, and c is the proposed one. , FIG. 5 is a diagram showing changes in the water level of the water level switch during the washing operation. 4...outer tank, 6...water tank, 8...recess, 11...
...Suction port, 12...Discharge port, 15...Waterway, 16
...Lint filter, 17...Rotary shaft, 18...
...Pulsator, 23...Water level switch.

Claims (1)

[Scope of utility model registration request] an outer tank, an inner tank rotatably mounted in the outer tank and having a recess in the inner bottom surface, a pulsator arranged in the recess and rotated during washing, and a suction port provided in the bottom of the recess of the inner tank. and a discharge port provided on the side of the recess of the inner tank,
It is equipped with a filter that is located in the inner tank and communicates with the discharge port through a waterway on the back side, and a water level switch that responds to changes in the water level in the outer tank and shifts from water supply to washing operation at a predetermined water level. A washing machine in which water in an outer tank is sent through a filter into an inner tank by the pumping action of a pulsator, characterized in that the suction port and the discharge port are provided at opposite positions with respect to the rotation axis of the pulsator. .