JPH0251359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dehydration control device for a centrifugal dehydrator or the like.

(Prior art and its problems) Recently, in centrifugal dewatering machines, the motor for rotating the dewatering basket is periodically turned ON and OFF to perform intermittent dehydration, and the time the motor is ON is set so that the motor rotates steadily from the start of operation. It is thought that it is possible to reduce wrinkles and damage on clothes by keeping the amount of water within the time required to reach the number of clothes, but in the past, the dehydration exercise time was set regardless of the quality or quantity of the clothes. However, excessive dehydration tends to occur during dehydration, and the problem of wrinkles and damage to clothes still remains during excessive dehydration.

(Objective of the Invention) The present invention has been made in view of the above points, and the dehydration state is determined based on the scattering of water droplets from the dehydration basket, and based on the determination result, it is selected whether or not to continue the dehydration operation. In this way, it is possible to provide a dehydration control device that can solve problems such as excessive or insufficient dehydration, as well as wrinkles and damage to clothes.

(Structure of the Invention) As shown in FIG. 1, the present invention is a device that performs intermittent dewatering by periodically turning on and off a motor 2 that rotates a dewatering basket 1, in which water droplets are scattered from the dehydrating basket 1. a dehydration detection section 3 that detects and generates an electric signal; and a dehydration state determining means 4 that determines whether the signal of the dehydration detection section 3 changes to a predetermined signal within a certain period of time from when the motor 2 is turned on. As a result of the determination by the determination means 4, when the signal of the dehydration detection unit 3 changes to a predetermined signal within a certain period of time, the motor 2 is kept in the ON state until the certain period of time has elapsed, and then the motor 2 is turned on for a certain period of time. The dehydration continuation means 5 then turns on the motor 2 again, and when the signal of the dehydration detection section 3 does not change to a predetermined signal within a certain period of time as a result of the determination by the dehydration state determination means 4, the motor is turned off. This structure is provided with a dehydration termination means 6 for terminating the dehydration operation, thereby achieving the intended purpose.

(Embodiment) The embodiment of the present invention shown in FIGS. 2 to 4 will be described in detail below.

FIG. 2 is a block diagram showing the entire control circuit section of a centrifugal dehydrator according to an embodiment of the present invention, where 11 is a program/fixed data memory (hereinafter referred to as ROM), and 12 is a temporary storage memory (hereinafter referred to as RAM). , 13 is the timer, 14 is the CPU and I/O
15 is a dehydration start switch, 16 is a dehydration detection unit, and 17 is a motor 18.
This is a drive circuit that performs ON/OFF control, and in this embodiment, a relay is used and control is performed by turning ON/OFF of the contact 19 thereof. The ROM 11 stores a program for controlling the CPU, and the RAM 12 is used as a data memory for the CPU. Then, the CPU continues to output the control program from the ROM by turning on the dehydration start switch 15 via the I/O section, and starts cooperation with the timer 13 based on the output signal of the dehydration detection section 16. The drive circuit 17 drives the I/O section by
It controls the The dehydration detection section 16 is
A dehydration sensor 20 is provided opposite to the dehydration hole at the bottom of the dehydration basket 1 and is made of a piezoelectric element that generates an electric signal when water droplets collide. In order to eliminate small output voltages, a comparator circuit 22 is provided to compare with a constant voltage and output only when the voltage is higher than the constant voltage, and an output (one output is for a short time) is provided through the comparator circuit 22. If there is, it consists of a peak value hold circuit 23 that generates an output that discharges in a longer time than that, and a comparison circuit 24 that outputs an L signal when the output exceeds a certain voltage, and outputs an H signal when the output falls below a certain voltage. In FIG. 3, a shows the output of the amplification circuit 21, and b shows the output of the comparator circuit 24 as a model.

Next, the control of the above configuration will be explained.

Now, when you turn on the dehydration start switch 15,
The CPU turns on the dehydration start switch 15 with the L input of _I1 .
By confirming ON and continuing the control program from the ROM 11, control is performed as shown in the flow chart shown in FIG. 4, and the dewatering operation is executed.

In FIG. 4, the dehydration start switch 15 is
When ON is confirmed, the output of _O1 is set to H signal, the contact 19 of the drive circuit 17 is turned ON, the motor 18 is driven, and the timer 13 is started. Thus, it is determined whether I ₂ =L until the data t of the timer 13 passes a certain period of time To.
Incidentally, the above-mentioned time To is appropriately set within the time required for the motor 18 to reach a steady rotation speed from the start of driving, and is set to, for example, about 10 seconds.

At the beginning of dehydration, since the clothes contain a large amount of water, I ₂ =
Becomes L. That is, when the motor 18 is driven and its rotational speed begins to increase, the number of water droplets flying out from the dehydration basket also increases, and the number of water droplets that collide with the dehydration sensor 20 increases and its force becomes stronger. Therefore, the output of the dehydration sensor 20 gradually increases as can be seen from the output of the amplification circuit 21 shown in FIG.
At time T ₂ , the output of the amplifier circuit 21 exceeds the comparison level, and the output of the comparison circuit becomes H as shown in FIG.
The signal changes to the L signal.

Now, if it is determined that I ₂ =L at time T ₂ , which is shorter than time To, data t of timer 13 becomes t.
The motor 18 waits until the relationship becomes tT ₀ as shown in Figure 3c.
is stopped, and then a certain OFF time is left. During this time, the motor 18, that is, the dewatering basket, rotates due to inertia, but its rotational speed gradually decreases, the number and force of water droplets scattered from the dehydrating basket decrease, and the dehydration sensor 2
The output of 0 will be small.

Eventually, a certain OFF time (for example, about 5 seconds)
elapses, the data t of the timer 13 becomes tT ₁
When the relationship is reached, the motor 18 is driven again after the timer 13 is stopped and cleared, and the previous operation is repeated.

As described above, intermittent dehydration is performed by driving and stopping (ON, OFF) the motor 18. As dehydration progresses due to such intermittent dehydration and the moisture contained in the clothing gradually decreases, the point at which I ₂ =L becomes gradually delayed. Then, as the dehydration approaches the _end , I ₂ =
When I 2 no longer becomes L, it is determined that I ₂ does not become L after time T ₀ has elapsed, and the motor 18 is stopped, and the timer 13 is stopped and cleared, thereby ending the dewatering operation.

In this embodiment, as described above, the dehydration state is determined based on the state of water droplets scattered from the dehydration basket, and it is selected whether or not to continue the dehydration operation based on the determination result. will no longer occur.

(Effects of the Invention) As described above, according to the present invention, there will be no excess or deficiency in the dehydration state, and problems such as wrinkles and damage to clothes caused by excessive dehydration can be solved, and wrinkles and damage to clothes caused by intermittent dehydration can be solved. can be more effectively reduced.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of the present invention, Fig. 2 is a block diagram showing the entire control circuit section of a centrifugal dehydrator in an embodiment of the invention, Fig. 3 is an explanatory diagram of the same operation, and Fig. 4 is the control same as the above. It is a flowchart. 1: Dehydration basket, 2: Motor, 3: Dehydration detection section,
4: Dehydration state determining means, 5: Dehydration continuation means, 6:
Means for terminating dehydration.

Claims (1)

[Claims] 1 Periodically turn on and off the motor for rotating the dewatering basket.
In a device that performs intermittent dehydration, there is a dehydration detection section that detects water droplets scattered from the dehydration basket and generates an electric signal, and a signal from the dehydration detection section that generates a predetermined signal within a certain period of time from when the motor is turned on. a dehydration state determining means for determining whether or not the dehydration state has changed; and as a result of the determination by the determining means, when the signal of the dehydration detection section changes to a predetermined signal within a certain period of time, the motor is turned on until the certain period of time has elapsed. After continuing the dehydration condition, the dehydration continuation means turns on the motor again after a certain OFF time, and the dehydration state determination means determines that when the signal of the dehydration detection unit does not change to a predetermined signal within a certain period of time. Turn off the above motor
1. A dehydration control device comprising: a dehydration terminating means for terminating a dehydration operation.