JPH0131180Y2 - - Google Patents

Description

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

(B) Conventional technology Generally, when washing with a washing machine, the user estimates the quality and quantity of the laundry by eye, and sets the water level and washing time based on experience, without considering water temperature. Ta. However, it is well known that the water temperature is closely related to the degree of washing, and if you blindly set the water level and time based only on the quality and quantity of the laundry, the difference in water temperature, Specifically, there is a difference in the degree of cleaning between summer and winter.

Therefore, Japanese Patent Laid-Open No. 55-66394 discloses a washing machine that performs washing by taking water temperature into consideration.

In an electronically controlled automatic washing machine that automatically operates according to a washing program, this system includes a detection means that detects the water temperature during washing and determines the water temperature rank, and a control that adjusts the washing time based on the signal from the detection means. means.

That is, the length of time for the washing process is changed depending on the water temperature, but the lower the water temperature, the longer the washing time required, making it impossible to shorten the washing time.

Furthermore, as shown in Figure 5, it is clear from experiments that the higher the water temperature, the easier the laundry (cloth) spins (better cloth rotation); taking this into consideration, when the water temperature is low, The washing time must be extended, with less favorable results.

(c) Problems to be solved by the invention The present invention attempts to solve the difference in cleaning efficiency due to water temperature in a washing machine even if the washing time is constant.

(d) Means for solving the problem The present invention provides a method for controlling the water temperature in the washing tub in a washing machine in which rotary blades disposed in the washing tub are repeatedly driven in a rotation cycle of rotation and rest. The apparatus is provided with a water temperature detecting means for detecting water temperature, and a control means for changing the ratio of rotation time during the rotation cycle in accordance with a signal from the water temperature detecting means.

(e) Effect: That is, the lower the water temperature, the greater the rotation time of the rotor during the rotation cycle, and the stronger the rotating water flow.

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

In Figures 3 and 4, 1 is the operating section of a two-tub washing machine equipped with a microcomputer 2, 1a is the operating panel attached to the front of the operating section 1, 3 is the power switch, and 4 is the overflow water level adjustment. control lever for 5
Reference numeral indicates a drain button that opens and closes the drain valve; 6 indicates a water fill button that switches the water supply to a washing tank (described later) or a spin-drying tank (not shown); and 7 and 8 display washing and spin-drying times, respectively. digital display,
Reference numeral 9 indicates a light emitting diode that indicates the strength of water flow in the tub during washing, and reference numerals 10 to 13 indicate operation buttons for electrically controlling each process of the washing machine.

Reference numeral 14 denotes a machine frame that supports the operation section 1, and has a washing tub 15 and a dehydration tub (not shown) installed therein. Reference numeral 16 denotes a rotary blade disposed at the bottom of the washing tub 15, which is rotated clockwise by a drive motor (not shown).
It is driven repeatedly in a rotation cycle of rest - counterclockwise rotation - rest. 17 is a lower water injection channel cover that covers a lower water injection channel (not shown), and has a lower water injection port 18;
Water is poured into the washing tub 15 from two locations: here and the upper water fill port 19. In addition, 20 is an overflow port filter, 22 is an upper lid of the washing tub 15, 23 is a dehydration lid, 24 is a drain hose, and 25 is a lint filter.

Now, below the lower water injection channel, that is, the lower water injection port 1
A water temperature sensor consisting of a negative characteristic thermistor 26 is attached to the back side of the water temperature sensor 8 (below the lowest water level surface), and a control means for the microcomputer 2 using the water temperature sensor will be explained based on FIGS. 1 and 2. do.

Output ports A, B of microcomputer 2,
HIGH or LOW (0 or 1) signals are output from C and D, respectively. That is, 16 different outputs can be obtained with the four combinations of A, B, C, and D.

These 16 outputs are sequentially output from the smallest value (A, B, C, D) → (0, 0, 0, 0) → (0,
0,0,1)→(0,0,1,0)→……(1,
1, 1, 1), and the thermistor 26 changes depending on the voltage at that time and the water temperature.
A comparator 27 compares the voltage determined by the resistance value of . When a signal enters the input port E of the microcomputer 2 connected to the output terminal of the comparator 27, the microcomputer 2 outputs the current output (A, B,
C, D) are determined to correspond to the water temperature,
A rotation cycle corresponding to the output as shown in FIG. 2 is set. That is, the lower the water temperature, the larger the ratio of rotation time during the rotation cycle.

Note that this water temperature detection and rotation cycle determination are performed during the water supply process before the washing process.

In addition, the rotation cycle shown in Figure 2 is when the strength of the water flow is set to "strong", and when the strength of the water flow is set to "medium", the rotation cycle shown in Fig. 2 is the one when the strength of the water flow is set to "medium". each time compared to the time of strong water current.
The time is reduced by 0.2 seconds, and further reduced by 0.7 seconds when the water flow strength is set to "weak".

As described above, in this embodiment, within a certain washing and rinsing time, the lower the water temperature, the longer the rotation time during the rotation cycle of the rotor blade, and the rotational water flow is set to be strong, so that the water temperature decreases. The reduction in cleaning efficiency caused by this can be sufficiently compensated for by changing the rotation cycle.

In other words, the rotation time of the rotor during the rotation cycle is automatically set according to changes in water temperature, so the user can set the time based on experience based on the quality and quantity of laundry without worrying about water temperature. By simply doing this, you can obtain a uniform cleaning rate regardless of the water temperature, specifically in both summer and winter.

Furthermore, water temperature can be detected in 16 stages by using the four output ports of the microcomputer 2, but if such subdivision of water temperature detection is not taken into account, the water temperature sensor must be made of bimetal. Depending on the configuration, it can be applied to a mechanical timer.

Furthermore, it goes without saying that the present invention can be applied not only to manual washing machines but also to fully automatic washing machines.

(g) Effects of the invention The washing machine of this invention automatically detects the temperature of the washing water and controls the drive of the rotary blades, so even if the water temperature changes with the seasons, the washing rate is almost uniform. can do.

In addition, the lower the water temperature, the greater the ratio of rotation time during the rotation cycle of the rotor blades, so even if the overall washing time is constant, the above effects can be obtained.
There is no need to extend the washing time even when the water temperature is low.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of the water temperature detection means consisting of a thermistor in the present invention, Fig. 2 is a time chart showing the driving state of the rotor blade for each output from output ports A, B, C, and D. FIG. 4 is a front view of the operation panel, FIG. 4 is a partially cutaway perspective view of the two-tub washing machine, and FIG. 5 is a characteristic diagram of the fabric surroundings with respect to water temperature. 2...Microcomputer, 15...Washing tub, 16...Rotary blade, 26...Thermistor.

Claims (1)

[Scope of utility model registration request] A rotary blade disposed in a washing tub is driven repeatedly in a rotation cycle of rotation and rest, and includes a water temperature detecting means for detecting the water temperature in the washing tub, and a water temperature detecting means for detecting the water temperature in the washing tub, and a signal from the water temperature detecting means. , a control means for changing the ratio of rotation time during the rotation cycle.