JPS6194696A - Dehydration apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a dewatering device incorporated into a washing machine.

(b) Conventional technology In order to carry out appropriate dehydration, the drive current of a motor during dehydration is detected, and the completion of dehydration is detected by capturing the rate of change of this current. It is shown in In this case, the dehydration is completed when the current change rate reaches a predetermined value, or after a certain period of time has elapsed since the current change rate reaches a predetermined value. However, if the process ends when the current rate of change reaches a predetermined value, dehydration is generally insufficient. In addition, although K attempts to obtain a dehydration rate according to the load by capturing the rate of change, if dehydration ends after a certain period of time from the time of arrival, it is not possible to obtain a dehydration rate according to the load. do not have.

(c) Problems to be Solved by the Invention The present invention aims to obtain a constant dewatering rate even when the amount and type of load changes.

The present invention compares the drive current of the motor with a predetermined standard current, measures the time it takes to reach the standard current using a relative soft signal, and calculates the amount of time it takes to reach the standard current according to changes in the arrival time. This problem is solved by determining the dewatering time using the motor.

(E) Effect: The total dewatering time is changed to automatic fishing in response to changes in the load, and as a result, the dewatering rate can be kept constant even if the load changes from time to time.

(F) From the example onwards, to explain based on the drawings, Fig. 1 is a cross-sectional view showing the internal mechanism of the fully self-help towing machine, (1) is the outer box, (2)
) is an outer tank, which is elastically suspended within the outer box (1) by a hanging rod (not shown). Inside the outer tank 12), there is installed a fluid layer/dehydration tank 141 having a large number of dehydration holes (3) in the peripheral wall. Dehydration 4 [Balance ring 15 on the rim of 9141
) is loaded, and a rotary blade (6) is provided at the center of the bottom. (7) is the motor for propelling the octopus, with a small pulley (8),
Dehydration tank 14j is connected via belt (9) and large pulley (101).
The dehydration shaft to which the rotor blade (6) is fixed (the wing shaft to which the rotor blade (6) is fixed)
Rotate 2. On the side is a bearing booth with a brake device that brakes the dehydration shaft (111) and a clutch device that controls the transmission of rotational force to the dehydration shaft (1υ).There is a drain port in the outer tank (2). I is provided, and this drain port 1
1ω is connected to a drain hose 116) having a drain solenoid valve U.

Figure 2 is an electrical circuit diagram of this washing machine, excluding the control section. A switch element (17) for clockwise rotation and a switch element (old) for left rotation are connected to the motor (7), and the switch element α is turned ON during dehydration.
A switch element part is connected to the water supply @magnetic valve I211, and a switch element (2) is connected to the water supply@magnetic valve I211. These switch elements 09 to 9 are triacs controlled by a microcomputer described later. Further, a current transistor P is connected to the motor f71 as a current detection means for detecting the motor drive current, and its secondary terminals a and b are connected to the control circuit.

Figure 6 is a block diagram of the control unit, and the cause is a microcomputer (hereinafter referred to as microcomputer) that is the center of control.
Comparison means 12411 Time measurement means and calculation means (support)
It is equipped with The secondary voltage of the current transformer is passed through a diode bridge, smoothed by a capacitor, converted to a short digital signal by an interface circuit including an A/D toilet converter, and inputted into a microcomputer. Also, here is the connection.

The microcomputer (■ outputs the motor drive signal to the gate of the switch element Uη (181) through the output circuit 6IJ as an output means. It also outputs the motor drive signal to the gate of the switch element 11iJ■ through the interface circuit 64I331. That is, when water is being supplied, switch element ■ is turned on; when draining water, switch element q9 is turned on; when washing, the switch element (17) side is alternately turned on to reverse the motor (7), and when water is being dehydrated, only switch element 0η is turned on. Turn it on and rotate the motor 17) in the right direction.

The microcomputer stores a predetermined standard current in advance, and compares it with the driving current of the motor (7) inputted by the current transformer (7) during dehydration using a comparison means. Then, the time measuring means measures the time from when the drive current rises until it reaches the standard current depending on the presence or absence of the comparison signal, and from this time the calculating means calculates the dewatering time based on a predetermined formula.

The microcomputer counts the calculated dehydration time and switches the switch element 07 to the motor (7) until the dehydration time is counted.
) outputs the drive @ signal. The time from rise to standard current changes depending on the amount and type of load, and this change also changes the dehydration time. For example, the dehydration time σ) is T = g't+h, where t is the measurement time, and g and h are coefficients. The state of this change is shown in FIG.

Figure 4 is a characteristic diagram of time versus motor drive current during dehydration.Characteristic curve (4) shows the case when the load is 0.5 KP, ■) is 1.0 KP, and (Q is 2.0 KP). show each,
The standard current is indicated by Io. As a characteristic, the motor drive current is large when raising the larva, decreases as the number of rotations increases, and becomes almost constant when rotating at a constant speed. Here, the standard current (Io
) (tl (tc) is different, but this time (tA) (ta) (tc) is calculated using the above formula to calculate the dehydration time (TA) (Ta) (Tc) is calculated.

Note that the standard current (work 0) can be changed depending on the type of load, and the change can also be made with the help of the user. Also, this example of means may be attached externally to the microcontroller.

(G) Effects of the Invention According to the present invention, the dehydration time is automatically changed according to the load, and the total dehydration time is also changed correspondingly, so that various loads can be kept almost constant. It can be dehydrated at a high rate, therefore,
It is possible to provide a rational dehydration device that does not waste time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the internal S mechanism of the ZENJIYOKOI1LI machine which is an embodiment of the present invention, Fig. 2 is an electric circuit diagram, Fig. 6 is a block diagram of the control section, and Fig. 4 is a characteristic diagram. It is. (4)...Washing/dehydration tank, 17)...Motor, ■・
...Current transformer (current detection means), M...Microcomputer, @...Comparison means, ■...Hour rwl measurement means, IV.
...Arithmetic means, 6...Output tautology (output means).

Claims (1)

[Claims] (1) In a dehydration device that drives a motor to rotate a dehydration tank at high speed, a current detection means for detecting the input current of the motor, a comparison means for comparing the detected current with a predetermined standard current, and a comparison signal. The present invention is characterized by comprising: a time measuring means for measuring the time to reach the standard current; a calculating means for determining the dewatering time by performing calculations based on the measured time; and an output means for driving the motor for the dehydrating time. Dehydration equipment.