JPH03127686A - Electrode type device for preventing scale deposition - Google Patents

Abstract

PURPOSE:To stably and efficiently prevent scale deposition by ionization by regulating the voltage to be impressed to a pair of electrodes to a constant voltage by a constant voltage circuit and simultaneously regulating the current between the electrodes to a constant current by a constant current circuit, and periodically inverting the polarities of the voltage by a polarity inversion circuit. CONSTITUTION:The output of the constant voltage circuit 9 is inputted to the constant current circuit 10, by which the current flowing between the cylindrical electrode 4 and the bar-shaped electrode 5 is so set as to attain always the prescribed value. The output current from the circuit 10 flows between the electrodes 4 and 5 to periodically invert the directions of the current by the polarity inversion circuit 11. The electrode 5 is electroplated by the electrolyte contained in the water if the voltage to make the electrode 4 cathode and the electrode 5 anode is impressed by this periodic polarity inversion. The plating films and deposits previously sticking to the electrodes are eluted and removed if the electrode 4 is made anode and the electrode 5 cathode by inverting the polarities of the voltage to be impressed to both the electrodes by the circuit 11. The elution quantity from the two electrodes is nearly equal if the time to pass the current is set equal before and after the polarity inversion.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field of the Invention The present invention relates to an electrode type scale adhesion prevention device that ionizes water flowing in a waterway to prevent scale from adhering to the waterway.

<Prior art> As a conventional technology of this kind, Japanese Patent Application Laid-Open No. 63-39690
"Liquid ionization method and device" disclosed in the publication No.
There is.

In this conventional device, water flows through an aluminum tube, and a carbon rod is coaxially arranged in the center of the tube (water channel). The aluminum tube and carbon rod are connected by a II electric wire, so when water flows through the tube, the aluminum tube becomes the negative electrode, the carbon rod becomes the positive electrode, and the water becomes the electrolyte, forming a voltaic cell and generating an electromotive force. . Due to this electromotive force ′! ! i The water that is the solution is ionized and ionized.

In this way, the water in the pipes is ionized and activated, so the hard calcium and magnesium contained in the water react and become soft calcium and magnesium compounds, which are washed away and cause scale to form in the pipes. It will not stick to the surface.

<Problem to be solved by the invention> However, in conventional ha, an aluminum tube and a carbon rod form a voltaic cell to generate an electromotive force, which ionizes the water in the tube and prevents scale adhesion. However, depending on the water quality, deposits may accumulate on the aluminum surface, and these deposits act as an insulator, impeding the movement of electrons, and cannot be ionized beyond a certain amount, making it difficult to prevent scale adhesion. It no longer functions properly. Furthermore, the electromotive force generated varies depending on the nature and temperature of the water flowing through the tube, making the voltage and flowing current unstable, and the effect of ionization is inconsistent.

Therefore, it is conceivable to forcefully flow an electric current between a pair of electrodes from the outside to cause ionization. However, when passing a current between a pair of electrodes, the higher the voltage applied between the pair of electrodes, the more likely it is to ionize, which is more efficient. −
If the voltage inside the membrane exceeds about 1.2 V, electrolysis will proceed and the initial purpose cannot be achieved.

Therefore, it is possible to use a constant voltage circuit to set the applied voltage to the value just before the water electrolyzes, but the electrolysis starting voltage varies depending on the water temperature, and it is necessary to prevent electrolysis from occurring at any water temperature. Therefore, the voltage value must be set with sufficient margin, and ionization efficiency must be sacrificed for this purpose.

In addition, if a voltage is applied between a pair of electrodes for a long time, electroplating progresses, albeit slightly, and is affected by the plating film produced by electroplating and the components contained in the water.
The drawback is that deposits accumulate on the electrodes, reducing the efficiency of ionizing water flowing through the pipes (water channels).

An object of the present invention is to provide an electrode type scale adhesion prevention device that solves the above-mentioned drawbacks.

<Means for Solving the Problem> In order to achieve this object, the electrode type scale adhesion prevention device according to the present invention includes a constant voltage circuit that receives the output of the power supply and makes it constant voltage in order to output a voltage of a predetermined value. and a constant current circuit that receives the output of the constant voltage 7-voltage circuit to constantize the current flowing through the pair of electrodes to a predetermined current value, and locally controls the polarity of the voltage applied to the pair of electrodes. The first feature is that it is equipped with a polarity reversal circuit for reversing the polarity, and the voltage value output from the constant voltage circuit is automatically controlled by a temperature sensor that detects the temperature of water flowing in the waterway. The second feature is that it can be changed symmetrically.

Effect> When flowing water in a waterway and applying an electric field to the flowing water, the voltage applied between the electrodes is always constant due to the constant voltage circuit even if the power supply voltage changes.

Furthermore, the current flowing between the pair of electrodes is made constant by the constant current circuit. Then, by the polarity inversion circuit,
The polarity of the voltage applied between the electrodes is periodically reversed to clean the inner surface within the waterway.

Further, depending on the temperature of the water flowing in the water channel, the voltage applied between the electrodes is automatically changed by the output of the temperature sensor so as to become the optimal voltage for ionization.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a cross-sectional structure of an electrode type scale adhesion prevention device according to an embodiment of the present invention.

Mounting flanges 2 are fixed to both ends of the m-tube 1.

Inside the steel pipe 1, there is an insulator made of a compatible material such as PVC material.
A tube 3 is arranged concentrically inscribed therein.

A cylindrical electrode 4 made of a stainless steel or titanium tube is attached to the inside of the insulating tube 3 so as to be inscribed therein.

Inside the cylindrical electrode 4, a rod-shaped electrode 5 made of stainless steel or titanium rod is arranged. This electric pole IIj5 is supported so as to be located on the central axis of one cylindrical electrode 4 by an electrode support rod 6 made of an insulating material such as PVC material.

The cylindrical electrode 4 and the rod-shaped electrode 5 are electrically connected to electrode leads 7a and 7b, respectively, so that current can be supplied from outside the steel pipe 1.

FIG. 2 is a block diagram showing the configuration of an electric circuit for passing a current between the cylindrical electrode 416 and the rod-shaped electrode 5 in FIG. 1.

Since the output voltage of the power supply 8 tends to change, the voltage is regulated to a predetermined value by a constant voltage circuit 9. The voltage value applied between the cylindrical electrode 4 and the rod-shaped electrode 5 varies depending on the quality of the flowing water, etc., but is preferably 0.7V to 1.0V. If it is 1.2 or more, water will begin to electrolyze, which is not preferable.

The output of the constant voltage circuit 9 is set so that the current input to the constant current circuit 10 and flowing between the cylindrical electrode 4 and the rod electrode 5 always has a predetermined current value 1, for example, 1 μA/cd. .

'7 current output from the constant current circuit 10 is applied to the cylindrical shape 1a.
i4 and the rod-shaped electrode 5ffi, the direction of the flowing If current is periodically reversed by the polarity reversal circuit N11.

By periodically reversing in this way, for example, when a voltage is applied using the cylindrical electrode 4 as a cathode and the rod-shaped electrode 5 as an anode, the rod-shaped electrode 5 is electroplated by the electrolyte contained in the water. However, if the polarity of the voltage applied to the circumferential electrode is reversed by the polarity inversion circuit 11 and the cylindrical electrode 4 is used as the anode and the rod-shaped electrode 5 is used as the cathode, the plating film and deposits that have previously adhered will be removed. It is eluted and removed.

If the current is applied for the same amount of time before and after reversing the polarity (e.g., o, oi seconds to 1 degree second), the current flowing between the electrodes is kept at a constant current, which improves water quality. The elution from both electrodes is almost equal, unaffected by the distance of the electrode. The substance eluted by this polarity reversal flows away with the water, so it does not stay in the tube or accumulate on one electrode.

This polarity reversing circuit 11 can be configured by two circuits of transformer contacts of a relay driven by a multivibrator, for example.

The output voltage of the polarity reversing circuit 11 of the electric circuit configured in this way is 0.7V to 1. OV is applied between the cylindrical electrode 4 and the rod-shaped electrode 5, and the water flowing in the tube is
A constant N flow is applied at μA/ci, and the polarity is reversed in 0.01 seconds to 10 seconds.

If the applied voltage and current value 1 reversal time are set to values that are considered to be most appropriate depending on the quality of the flowing water, scale components such as calcium and magnesium contained in the water flowing inside the pipe may adhere to the inside of the pipe, or As time passes, deposits no longer accumulate on the surface of the M pole.

Furthermore, as shown in FIG. 3, by providing a temperature sensor 14 inside the pipe, the temperature of the water flowing inside the pipe is detected.
By changing the output voltage of the constant voltage circuit 9 according to changes in water temperature via the temperature detection circuit 15, the applied voltage can be controlled to always maintain the optimal voltage value for ionization even if the water temperature changes. Therefore, there is no need to set the voltage value to a low efficiency voltage value to prevent water from electrolyzing or to take into account temperature changes.

In addition, although the example of FIG. 1 shows the case where the waterway is a pipe,
It is also applied to a U-shaped groove as shown in FIG.

In Fig. 4, 1' is an outer copper body, 3' is an intermediate insulator, 4- is an inner electrode, and 5' is a plate-shaped electrode paired with electrode 4'. As in the case of FIG. 1, a voltage whose polarity is periodically reversed is applied to the electrodes 4' and 5'.

The waterways are pipes in Figure 1 and U! in Figure 4. ? ! Of course, it is applicable not only to grooves but also to various other shapes.

<Effects of the Invention> As explained above, the present invention uses a constant voltage circuit to make the voltage applied to a pair of electrodes that electrically act on flowing water in a waterway constant, and also to make the voltage between the pair of electrodes constant. The flowing current is made into a constant current by a constant current circuit, and the polarity of the voltage applied to the -C1 electrode is periodically reversed by a polarity reversing circuit, so the voltage and flowing current do not become unstable, and the scale due to ionization is reduced. Stably prevents adhesion,
It can be done efficiently.

Further, even if used for a long time, the electrodes will not be affected by the plating film or components contained in water, and the ionization efficiency will not decrease.

Additionally, depending on the temperature of the water in the water channel, the output voltage of the constant voltage circuit is automatically changed by the output of the temperature sensor so that the voltage applied between the pair of electrodes becomes the optimal voltage for ionization. For example, the efficiency does not decrease depending on the water temperature as in the past.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
Applying current to the cylindrical electrode 4 and rod-shaped electrode 5fJ shown in the figure,
FIG. 3 is a block diagram showing another embodiment of the present invention, and FIG. 4 is a perspective view showing essential parts of still another embodiment of the present invention. 1...Steel pipe, 2...Mounting 7 lange, 3
...Insulating tube, 4...Cylindrical electrode, 5.
... Rod-shaped electrode, 8 ... Power supply, 9 ... Constant voltage circuit, 0 ... Constant current plane path, 1 ... Polarity inversion circuit , 4...Temperature sensor.

Claims (2)

[Claims] (1) An electrode type scale that is equipped with a pair of electrodes that act electrically on the flowing water in the water channel, and ionizes the flowing water by passing a current between the pair of electrodes to prevent scale from adhering to the water channel. The adhesion prevention device includes a power source (8) and a constant voltage circuit (9) that receives the output of the power source (8) and makes it constant to output a voltage of a predetermined value.
), a constant current circuit (10) that receives the output of the constant voltage circuit (9) and constantizes the current flowing through the pair of electrodes to a predetermined current value; An electrode type scale adhesion prevention device characterized by comprising a polarity reversal circuit (11) for periodically reversing polarity. (2) The voltage value output from the constant voltage circuit automatically changes according to a temperature change detected by a temperature sensor (14) provided in the waterway. Electrode type scale adhesion prevention device.