JPS6052757A - Detector of waste water - Google Patents

Abstract

PURPOSE:To prevent the degradation of an electrode due to a dehydrated liquid to improve highly reliability by providing a pair of electrodes, which is not brought into contact with waste water and face each other, in a drain pipe and detecting the completion of dehydration with the change of the electrostatic capacity between both electrodes due to the presence or absence of the waste water. CONSTITUTION:A motor 2 supported by a spring 4, a dehydrating tank 5 which is connected to the motor 2 by a shaft 3 and is rotated at a high speed, a water receiving tank 6 which gathers the dehydrated liquid, a drain pipe 11, and a drain pipe 7 are provided in a machine frame 1. A CR oscillating circuit unit 8 which is a part of the device detecting the completion of the dehydration is attached to the outside wall of the water receiving tank 6, and the lead wire 9 of the signal electrode and the lead wire 10 of the earth electrode are led out from the CR oscillating unit 8 and are connected to individual electrodes provided in the drain pipe 11. The drain pipe 11 has a double pipe structure consisting of concentric tubes 11a and 11b, and a signal electrode 9b is buried in the inside tube 11b, and an earth electrode 10a is provided on the outside wall of the outside tube 11a, and both tubes 11a and 11b are connected partially for the purpose of leading out the lead wire 9 of the signal electrode.

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention is based on the Arai i! This relates to the control of the dehydration process among the washing, rinsing, and dehydration processes on the beach.

(Prior Art) Conventionally, as a means for detecting the end of the spin-drying process used in washing machines, a water receiving tank provided outside the spin-drying tank or an I
) Drainage flow path for drained dehydrated liquid 1. A pair of electrodes 1J and 1 was provided, and the completion of dehydration was detected by utilizing the fact that the state between the electrodes changed to a conductive state or a non-conductive state depending on the presence or absence of a dehydrating liquid.

This method has a structure in which the electrode is in constant contact with the dehydrating solution, so the electrode is likely to become dirty or deteriorate due to corrosion, which has the serious drawback of reducing reliability. was.

(Objective of the Invention) In view of the above-mentioned drawbacks, the present invention aims to provide a dehydration detection device that has a long life and high reliability by making the electrode non-contact with the dehydration liquid.

(Example) Hereinafter, the dehydrator of the present invention will be described in detail with reference to illustrated examples.

FIG. 1 is a vertical sectional view showing an outline of the dehydrator of the present invention.

In the figure, 1 is a machine frame, inside which is a motor 2 supported by a spring 4, a dehydration tank 5 connected to the motor 2 by a shaft 7) 3, which rotates at high speed, and a water tank for collecting dehydration liquid. A receiving tank 6, a drain pipe 11, and a drain pipe 7 are provided. Further, a CR oscillation circuit unit 8, which is a part of the device for detecting the end of dehydration, is attached to the outer wall of the water receiving tank 6, and the CR oscillation unit 8 has a signal electrode lead wire 9 and a ground electrode lead wire 10. Each of them is drawn out and connected to each electrode provided on the drain pipe 11.

FIG. 2 is an enlarged vertical sectional view of the drain pipe 11, and FIG. 3 is a sectional view taken along line AA in FIG. As shown in the figure, the drain pipe 11 has a double pipe structure consisting of concentric pipes 11a and llb, with a signal electrode 9b embedded in the inner pipe 111) and a ground electrode on the outer wall of the outer pipe 11a. 10a is provided, and both tubes 11a, llb are partially connected in order to draw out the lead wire 9 of the signal electrode. This structure forms a cylindrical capacitor. still,
The drain pipe 11 is made of an electrically insulating material, and the dehydrating liquid is distributed between the inside of the inner pipe 11b, the inner pipe 111] and the outer pipe 11.
It is designed to drain water by flowing between it and a. However, the shapes of the drain pipe 11 and the electrodes 9a, 10a are not limited to this embodiment.

FIG. 4 is a block diagram showing the basic configuration of a microcomputer used in the dehydrator control device of the present invention. The microcomputer 100 is a CPU I that controls all the controls.
U 1 and R which stores the program and fixed data.
OM102, RAMI (13) for temporary storage, and I10 unit 1 for outputting signals to and from the peripheral circuit 106.
04 and a timer part 105.

FIG. 5 is a block diagram of an electronic control circuit using a microcomputer for the dehydrator of the present invention.

In the figure, 20 is an AC power supply, 21 is a DC power supply,
A constant voltage is supplied to the microcomputer 100. 22
23 is an electrode section consisting of a signal electrode 9a and a ground electrode 10a provided in the drain pipe 11, and 23 is an electrode section 22.
24 is an F/V converter that converts the frequency change into a voltage change, and 25 is an A/V converter that converts an analog quantity into a dinotal quantity.
The D converter 26 is a start switch that starts the dehydration process. Further, 27 is a reference signal oscillation circuit for the microcomputer 100, 28 and 29 are driver circuits for driving peripheral circuits, 30 is a drive circuit for the motor 2, and 31 is a dehydration LED display circuit. Here, a portion consisting of the electrode section 22, the CR oscillation circuit 23, and the F/\I converter 24 is referred to as a dehydration detection section 40.

FIG. 6 shows the relationship between the dehydration time, the dehydration amount, and the output voltage of the dehydration detection section. When dehydration starts, the output voltage of the dehydration detection unit suddenly decreases as the amount of dehydration increases rapidly, and then returns to the top again, showing a V-shaped characteristic. As dehydration approaches completion, the amount of dehydration increases. When the dehydration detection section stops changing much, the output voltage of the dehydration detection section also becomes a constant value. The dehydration detection device in the dehydrator of the present invention utilizes this characteristic.

FIG. 7 is a flowchart showing the dewatering process of the dehydrator of the present invention. To explain the operation with reference to this diagram, first, when the start switch 26 for starting the dehydration process is turned on, the input to the input terminal 11 of the microcomputer 1f)0 becomes ``OK'', and the output terminal 0 of the microcomputer 100 is turned on. ．． ．． 02 respectively as "I-eye", driver circuit 2
9.28, the dehydration LED of the ED circuit 31 is turned on, and the drive circuit 30 of the motor 2 is operated. Next, a timer 105 is started, and after a certain period of time (for example, 20 seconds) has elapsed, the timer 105 is cleared, and the output from the dehydration detection section 40 is sent to the input terminal I2 of the microcomputer 100 via the A/D converter 25. Load, R
It is stored in A11K03 as memory 841. Further, a value M preset from the ROM 102.

Read out, M, and M. Compare. Read the output from the dehydration detection unit 4o until M, ≧i.

Repeated comparisons are made. M, 2M, roar,
The microcomputer 100 has an output terminal 021()1
As Ill, through the driver circuit 28.29,
The drive circuit 3o of each motor 2 is stopped, and the dehydration LED of the dehydration LED display circuit 31 is turned off.

(Effects of the Invention) As described above, the dehydrator of the present invention can automatically detect the end of dehydration based on the presence or absence of the dehydrating liquid using the electrodes 9a and 10a provided in a non-contact state with the dehydrating liquid. It is possible to prevent damage and wrinkles on the cloth in the dehydration tank due to excessive dehydration, and conversely, it is also possible to prevent insufficient dehydration. Further, due to the above-described structure and operation, the electrodes are not deteriorated by the dehydrating liquid, and reliability can be highly improved. Furthermore, the completion of dehydration is detected by the presence or absence of water between the electrodes.This dehydration detection device can also be used to detect the completion of drainage, and with this detection device alone,
It is also possible to detect the completion of both the dehydration and drainage processes, making it a meaningful invention from an economic standpoint.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the dehydrator of the present invention, FIG. 1 is a vertical side view thereof, FIG. 2 is an enlarged vertical sectional view of the drain pipe section, and FIG. 3 is FIG. 2A- A is a sectional view, Figure 4 is a block diagram showing the basic configuration of the microcomputer, Figure 5 is a block diagram of the electronic control circuit, and Figure 6 is a diagram showing the relationship between the amount of dehydration and the output voltage of the dehydration detection unit with respect to the dehydration time. , FIG. 7 is a flowchart showing the control operation. 2-1-Motor 5-11 Water tank 6---Water tank 9a Lee signal electrode J 0a---
Earth electrode 11-m-Drain pipe Applicant Sharp Co., Ltd. Agent Haruyumi Suzuki “M1 Figure 2 Figure 6 Special opening ffGO-52757 (4)

Claims (1)

[Claims] In a dehydrator equipped with a dehydration tank that is rotated at high speed by a motor, a pair of electrodes are installed in the drain pipe that face each other without contacting the waste water, and dewatering is performed by changing the capacitance between the two electrodes depending on whether or not there is waste water. A drainage detection device characterized by detecting completion.