JPS6335277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a dehydrator, and particularly to automatic control thereof.

(Prior art) Conventionally, dehydrators have been controlled by timers, but such timers were set based on the user's intuition and experience, which caused problems such as over- or under-drying or fabric damage due to over-drying. There was a problem.

(Objective) The present invention electrically detects when water droplets of the dehydrating liquid squeezed out from the cloth subjected to dehydration collide with a dehydration sensor, and automatically controls the dehydration operation based on the result. This has overcome the drawbacks of the previous model, and in particular the dehydration sensor has been set at the position where the most stable output can be obtained, ensuring that the desired purpose can be achieved.

(Example) Examples of the present invention will be described below with reference to the drawings.

Figure 1 is a front view showing the main parts of the dehydration sensor.
FIG. 2 shows the same side view, showing a ceramic piezoelectric element 12 (hereinafter referred to as a piezoelectric element. Electrodes are formed on both sides of the piezoelectric element 12, respectively) and the piezoelectric element 1.
2 shows the external appearance of the metal diaphragm 11 which is electrically connected to one electrode surface of the metal diaphragm 11 and the electric terminals 13 and 14.

FIG. 3 shows the appearance of the dehydration sensor 10, where 15 is an electrically insulating case. 17a~
d is a stop hole.

FIG. 4 is a sectional view taken along line A-A' in FIG. 3, in which the piezoelectric element 12 and metal diaphragm 11 shown in FIG. Indicates the condition. 15a is a circular protrusion provided on the case.

FIG. 5 is a cross-sectional view of the main part when the dehydration sensor 10 is attached to the dehydrator, in which 1 is a crosspiece frame, and the crosspiece frame 1 has a motor 2 that drives the dehydration tank 5 via a cushioning material (for example, a spring) 4. is installed. The dewatering tank 5 is connected to the motor 2 by a shaft 3. Reference numeral 6 is a water receiving tank located on the outer periphery of the dewatering tank 5 for receiving the dehydrated liquid, and a drain pipe 7 is connected to a part of the bottom of the tank. The dehydration tank 5 has an appropriate number of holes 8a to 8g through which the dehydration liquid passes. A dehydration sensor 10 is provided so as to face a hole 8a, 8b, 8c, or 8d formed in the lower part of the dehydration tank 5.

FIG. 6 is an enlarged cross-sectional view of a main part showing a state in which the dehydration sensor 10 is attached. The case 15 of the dehydration sensor 10 is inserted into the screw 19 and the nut 2 through the gasket 18a in such a way as to cover the hole made in the water tank 6.
0, it is closely fixed to the water receiving tank 6. The protrusion 15a of the case 15 bites into the gasket 18a. 18b is also Patsukin. The arrows indicate where the water droplets collide.

FIG. 7 is a diagram showing the positional relationship between the dehydration tank 5 and the dehydration sensor 10. It is installed at 6.

FIG. 8 is a block diagram of the main part of the electronic control circuit that controls the dehydration process, in which the detection section 21 is connected to the dehydration sensor 10.
an amplification circuit 22 for amplifying the output voltage of the dehydration sensor 10; and a comparison circuit 23 provided to compare with a constant voltage and output only when the voltage is higher than the constant voltage in order to eliminate a small output voltage from the dehydration sensor 10. When there is an output via the comparator circuit 23 (one output is for a short time), a peak value hold circuit 24 generates an output that is discharged in a longer time than that, and when the output exceeds a certain voltage, an L signal is generated. and a comparator circuit 25 which outputs an H signal when the output becomes below a certain voltage.

In FIG. 8, 26 is a start switch that starts the dehydration process, 100 is a controller composed of a microcomputer, and controller 10
The relationship between the basic configuration of 0 and the external circuit is shown in FIG.

101 is a CPU, 102 is a program/fixed data memory ROM, and 103 is a temporary storage memory.
RAM, 104 is a timer, and 105 is an I/O section (input/output section). 27 controls the motor 2 by the output of the controller 100.
In the drive circuit that turns ON and OFF, a relay is assumed to be used in the drive circuit in FIG. 8, and its contact point is 33. 3
0 and 32 are windings of the motor 2, and 31 is a capacitor.

10a shows a model of the output waveform of the amplifier circuit 22, and FIG. 10b shows the model of the output waveform of the comparator circuit 25.
The output model of is shown in correspondence with FIG. 10a. This output model shows the state when 2 kg of ramen cloth shown in FIG. 11 is dehydrated, and the position of the dehydration sensor 10 at this time is the position shown in FIG. 7. When FIG. 10a corresponds to FIG. 11, the rotation speed of the motor 2 gradually increases when dehydration starts (0 seconds), and water droplets of the dehydration liquid fly out of the dehydration tank 5 and collide with the dehydration sensor 10. Large outputs can be obtained one after another in short intervals in about 8 seconds (this time varies depending on the type and amount of fabric, etc.), but about 40 seconds
seconds (this time also varies depending on the type and amount of cloth, etc.)
As time passes, the change in dehydration rate suddenly decreases. That is, the amount of water removed rapidly decreases, the number of water droplets colliding with the water removal sensor 10 decreases, and the water droplets become small, resulting in a small output. On the other hand, as shown in FIG. 10b, the output of the comparator circuit 25 is initially H, but becomes L from 8 to 40 seconds, and becomes H again after 40 seconds.

The above 40 seconds is the point where the dehydration rate changes from rapid to slow, and experiments have shown that several times this time (for example, 5 times) is required to actually reduce the moisture content. It is being

Next, an example of control of the dewatering operation will be explained according to the flowchart of FIG. 12. First, turn on the start switch 26. When the start switch 26 is confirmed to be ON with the L input of I ₁ , the output of O ₁ becomes H.
Then, the motor 2 is driven via the drive circuit 27, and then the timer 104 is started. When the timer data T becomes T≧10 seconds (meaning that the signal is not seen for 10 seconds), it is determined whether the input from the detection unit 21 (the input signal is H or L) is I ₂ =L.
If I ₂ is not L, wait for 40 seconds and if it is not set to L within that time, it will be determined that there is some kind of abnormality (for example, no cloth is inserted, the motor is not rotating normally, etc.) and motor 2 will be stopped. to stop the timer 104 and clear the timer data. On the other hand, if it does not reach 40 seconds and I ₂ = L, then
It holds until I ₂ =H, and when I ₂ =H, the timer data T is read (the timer data at this time is _T1 ). From this T ₁ to the dehydration completion time T ₂ (T ₂ =
T ₁ ×5) is calculated. Next, the timer data T
Determine whether or not T≧T _2. If T≧T ₂ , dehydration is complete, so the output of _O1 is set to L, the motor 2 is stopped via the drive circuit 27, and the timer 10 is activated.
Stop 4 and clear the timer data.

In this way, since the dewatering operation can be automatically controlled, problems that arise when relying on the user's intuition and experience as in the past, such as excessive or insufficient dehydration, and fabric damage due to excessive dehydration, can be avoided. Appropriate dehydration can be performed without any problems.

Next, the position of the dehydration sensor 10 will be described in detail. In the above embodiment, as shown in FIG.
The dehydration sensor 10 is installed so that the collision surface is orthogonal to the center line , the output of the dehydration sensor 10 is always stable, and the amplifier circuit 22 can obtain a sufficient output as shown in FIG. 10a. Moreover, the dehydration sensor 10 is the first
As shown in Figure 3, even if the dehydration tank 5 is installed so that the collision surface is perpendicular to the tangent y of the tank 5 in the rotation direction, the impact force of the water droplets is strong and the probability of hitting is high, so A stable output could be obtained, and the same results as in the above example were obtained. Therefore, the seventh
As can be seen from the example shown in the figure and FIG. 13, if the dehydration sensor 10 is installed in the range surrounded by the center line x and the tangent line y in FIG. 14, that is, between the positions 10a and 10b, Stable output can be obtained.

In summary, the dehydration sensor 10 is connected to the center line x extending radially from the rotation center of the dehydration tank 5.
A tangent line y of the tank 5 toward the rotation center, or a line parallel to the center line x and inside the outer periphery of the dehydration tank 5 and facing the rotation direction of the dehydration tank 5 (line l shown in Figure 14)
It is only necessary to install the collision surface so that it is approximately perpendicular to any one of the lines. If the collision surface is not orthogonal to any of these lines, for example, the 16th line
If the dehydration sensor 10 is installed in the position shown in the figure, the impact force of the water droplets will be weak and the probability of being hit by the water droplets will be low, making it impossible to obtain a sufficient output as shown in Fig. 17. FIG. 17a shows an output model of the amplifier circuit 22, and FIG. 17b shows an output model of the comparator circuit 25 in correspondence with FIG. 17a. This shows the state when 2 kg of cloth is dehydrated. In this way, when the dehydration sensor 10 is installed in the position shown in Fig. 16, the output in Fig. 17a is constantly lower than the comparison level even though 2 kg of ramen cloth has been dehydrated, and the output in Fig. 17b is always lower than the comparison level. If the signal remains at H, the dehydration completion signal will be immediately issued and the dehydration operation will be stopped, making it impossible to achieve the intended purpose.

In addition, FIG. 15 shows the water receiving tank 6 having a cylindrical shape, and in the case of such a water receiving tank 6, no matter where the dehydration sensor 10 is installed, its impact surface is perpendicular to the center line x. be able to. however,
It is desirable that the mounting portion of the dehydration sensor 10 be made flat from the water leakage prevention surface.

(Effects) As described above, in the present invention, it is possible to electrically detect the collision of water droplets of the dehydrating liquid squeezed from the cloth to be dehydrated with the dehydrating sensor, and automatically perform the dehydrating operation based on the result. By controlling the dehydration sensor, the previous drawbacks can be overcome, and by installing the dehydration sensor in a position where a stable output can be obtained, the desired purpose can be achieved reliably.

[Brief explanation of the drawing]

1 to 15 show embodiments of the present invention,
Figures 1 and 2 are front and side views showing the main parts of the dehydration sensor, Figure 3 is a front view of the dehydration sensor, Figure 4 is a sectional view taken along line A-A' in Figure 3, and Figure 5 is a front view and side view showing the main parts of the dehydration sensor. A schematic cross-sectional configuration diagram of a dehydrator equipped with a dehydration sensor, Figure 6 is a cross-sectional view showing how the dehydration sensor is installed, Figure 7 is a diagram showing the installation position of the dehydration sensor, and Figure 8 is the main part of the electronic control circuit. Block diagram, Figure 9 is a diagram showing the relationship between the controller and external circuits,
Figures 10a and 10b are output waveform diagrams of each part, Figure 11 is a diagram showing temporal changes in dehydration rate, Figure 12 is a dehydration control flowchart, and Figures 13 to 15 are diagrams of the installation position of the dehydration sensor. It is a figure which shows another example. 16 and 17 are diagrams for comparatively explaining the present invention. FIG. 16 is a diagram showing the mounting position of the dehydration sensor, and FIG. 17 is an output waveform diagram of each part. 5: Dehydration tank, 10: Dehydration sensor.

Claims (1)

[Claims] 1. In a dehydrator equipped with a dehydration sensor that generates an electric signal due to collision of dehydration liquid, and a control means that automatically controls the dehydration operation based on the electric signal from the sensor, A center line extending to the dehydration tank, a tangent to the dehydration tank in the direction of rotation of the dehydration tank, or a line parallel to the center line and inside the outer periphery of the dehydration tank and directed in the rotation direction of the dehydration tank, A dehydrator characterized in that the dehydration sensor is installed so that collision surfaces are substantially orthogonal.