JPH0341666Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a washing machine.

(b) Prior Art For example, a general washing machine as shown in Japanese Utility Model Publication No. 60-35507 will be explained based on FIGS. 4 and 5.

1 is the machine frame of a two-tub washing machine, 2 and 3 are the machine frame 1
A washing tub and an outer dehydrating tub are arranged side by side inside, 4 is a dehydrating tub rotatably supported in the outer dehydrating tub 3, and 5 is a rotating blade disposed at the center of the bottom of the washing tub 2, as shown in the figure. Not connected to a drive motor, it flips equally left and right. Reference numeral 6 indicates an operation section installed above the rear of the machine frame 1, 78 indicates various operation buttons arranged on the front surface of the operation section 6, 9 indicates a power switch, 10 indicates an overflow water level adjustment lever, and 11 indicates the operation described above. Part (6)
a water injection device having a water injection port 12 provided at the bottom of the washing tub 2 and facing into the washing tub 2; 13 is a lower water injection port; 14;
15 is a lint filter; 15 is an upper lid of the washing tub 2; 16 is an upper lid of the outer dehydration tub 3; 17 is an overflow chamber provided by bulging the rear corner of the washing tub 2;
18 is an overflow port arranged in the overflow chamber 17;
The overflow water level adjustment lever 10 allows displacement in the vertical direction. 19 is an overflow filter that covers the front opening of the overflow chamber 17, and 20 is a drain hose.

In such a washing machine, rinsing is performed by injecting water from the water inlet 12 and overflowing from the water overflow port 18.

However, in such a rinsing method, the rotary blade 5 is located at the overflow port 18 when viewed from the water inlet 12.
If the water inlet 12 is rotated in the direction closer to the water inlet (in the direction of arrow A), the water from the water inlet 12 will immediately overflow, and if it is rotated in the direction farther away (in the direction of arrow B), the water from the water inlet 12 will immediately overflow. Foam breakage (foam flowing out from the overflow port)
The rinsing effect was poor, and the rinsing effect was generally inferior.

(c) Problems to be solved by the invention The present invention improves the rinsing effect when rinsing with water in a washing machine.

(d) Means for Solving the Problems The washing machine of the present invention includes a washing tub, a rotary blade disposed at the bottom of the washing tub, a reversing drive means for the rotary blade, and an upper portion at the rear of the washing tub. and a water inlet provided at the rear of the washing tub,
When the reversal time of the rotary blade by the reversing drive means is ta, the time for rotating closer to the overflow port as viewed from the water injection device, and tb, the time for rotating farther away, ta< The relationship is set to tb.

(e) Effect That is, by setting the time tb longer than the time ta, the fresh water from the water injection device is spread throughout the tank, promoting the exchange of old and new water, and also preventing the breakage of bubbles on the water surface. promote

(f) Examples Embodiments of the present invention will be described based on the drawings.

However, the same reference numerals are used for the same parts as in the conventional example, and the explanation is omitted.

The operation of the washing machine of this embodiment is controlled by a microcomputer.

FIG. 6 shows a block circuit diagram of a control unit centered on a microcomputer 21 (hereinafter referred to as microcomputer), 22 is an external display circuit that turns on and off light emitting diodes to indicate the progress status of each process, and 23
24 is a detection circuit that detects whether or not water is being supplied to the tank; 25 is a transmission circuit that sends a clock signal and a reset signal to the microcomputer 21; 26 is an abnormality notification and A buzzer circuit notifying the end of the process; 27 a reference pulse generation circuit that generates a pulse that is the basis for time counting by the microcomputer 21; 28 a drive motor; 29 a load power control circuit for controlling the operation of the drive motor 28. , 30 is a power supply circuit.

During the washing and rinsing processes, the microcomputer 21 rotates the drive motor 28 left and right with a rest period in between.

First, in the washing process, as shown in Figure 7, the rotation time in one direction is fixed at a very short time t5 seconds, and the rotation time in the other direction is set at a relatively long time with a pause time t0 in between. Each time is set to be shorter than the previous time.

That is, initially clockwise rotation t1 seconds → left t5 seconds → right t2 seconds → left t5
Execute the first reversal cycle with a short left rotation time of seconds → right t3 seconds → left t5 seconds (t1 > t2 > t3 > t5 > t0), then a pause of t4 seconds (t4 > t1) After a period, the second one fixed the clockwise rotation time to a short time.
A reversal cycle is performed, and the first and second reversal cycles are then repeated.

By doing this, the effect of short-time rotation in the - direction offsets the inertial water flow generated by long-time rotation in the other direction, and at this time, the laundry that was floating on the inertial water flow is brought to a sudden stop. By doing so, it is possible to give an impact to the laundry and improve the cleaning power. In the experiment, as shown in FIGS. 8 and 9, better cleaning characteristics were obtained than in the conventional case where the left and right rotation times were equal.

Next, in the rinsing step, the microcomputer 21 initially configured the rotor blade 5 to have a short period of time, as shown in FIG. The drive motor 28 is controlled to perform a reversal cycle.

In the middle of the rinsing process, instead of the above-mentioned reversal cycle, a reversal cycle is executed in which the counterclockwise rotation time tb seconds is set longer than the clockwise rotation time ta seconds as shown in FIG. In other words, clockwise rotation as shown by arrow A in Figure 5 is
Since the distance to the overflow port 18 is short when viewed from the water inlet 12, the rotation time in this direction is shortened in order to keep the rate of water from overflowing from the water inlet 12 to a low level, and arrow B is used. When turning counterclockwise, the distance from the water inlet 12 to the overflow port 18 is far. The rotation time in the direction was made longer.

Then, near the end, the originally executed reversal cycle is executed again, and the rinsing process is completed.

In this way, in the rinsing step, by executing the reversal cycle in which the rotation time ta in the direction closer to the overflow port 18 as seen from the water inlet 12 < the rotation time tb in the farther direction, as described above, contamination can be reduced. The exchange of water with clean water and the removal of foam were promoted, and the rinsing effect was improved in experiments as shown in Figure 3. Incidentally, the rinsing ratio here refers to the following: Electrical conductivity of the liquid before rinsing - Electrical conductivity of the liquid after rinsing / (Electrical conductivity of the liquid before rinsing - Electrical conductivity of tap water) x 0.9.

(g) Effects of the invention According to the washing machine of the invention, the rotation time ta in the direction closer to the overflow port when viewed from the water injection device is shortened.
Since the rotation time tb in the far direction is set long, the rate at which fresh water from the water injection device immediately overflows from the overflow port is suppressed, and the exchange of old and new water is promoted. It can sufficiently remove the bubbles that tend to stagnate in water, and has an excellent rinsing effect when rinsing with water.

[Brief explanation of the drawing]

Figure 1 is a time chart of the reversing cycle in the middle of the rinsing process in the washing machine of the present invention, Figure 2 is a time chart of the reversing cycle at the beginning and end of the same process, and Figure 3 is a characteristic diagram of the rinse ratio versus time. Figure 4 is an overall perspective view of the washing machine, Figure 5 is a diagram of the internal mechanism seen from the same plane, Figure 6 is a block circuit diagram of the control section, Figure 7 is a time chart of the reversal cycle during the washing process, and Figure 8. and FIG. 9 are cleaning characteristic diagrams during the washing process, respectively. 2...Washing tub, 5...Rotary blade, 11...Water injection device, 18...Water overflow port, 21...Microcomputer, 28...Drive motor (21, 28: Reversing drive means).

Claims (1)

[Scope of utility model registration request] A washing tub, a rotary blade disposed at the bottom of the washing tub, a reversing drive means for the rotary vane, a water injection device disposed above the rear part of the washing tub, and a water overflow port provided at the rear part of the washing tub. and when the reversal time of the rotary blade by the reversing drive means is ta, the time for rotating closer to the water overflow port as viewed from the water injection device, and tb, the time for rotating farther. To,
A washing machine characterized by setting the relationship such that ta<tb.