JPH043254Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present application relates to a galvano-type corrosion sensor used in a device for detecting the corrosivity of cooling water for internal combustion engines or industrial water.

[Conventional technology]

Corrosion inhibitors are used in cooling water for internal combustion engines and industrial water to prevent corrosion of metals.
may be mixed in. In this case, the effectiveness of the corrosion inhibitor decreases if its concentration falls outside the appropriate range. Corrosion monitoring devices are therefore used that function to check the corrosion-preventing effectiveness of the corrosion inhibitor and to issue a warning when that effectiveness has diminished.
For example, as shown in FIG. 4, a corrosion sensor 2 is inserted into a cooling water system 1, and the sensor is connected to a detection circuit 3 and an alarm 4 connected thereto. The corrosion sensor 2 has a pair of electrodes 7 and 8 made of different materials protruding from the upper end of a plastic body 6, and conductive wires 9 and 8 connected to the detection circuit 3, respectively.
It consists of 10 connected together.

This device utilizes the fact that when the effectiveness of the corrosion inhibitor in the cooling water decreases, the conductivity of the cooling water increases. Alarm 4 is activated.

[Problem that the invention attempts to solve]

Cooling water has low conductivity, and the detection current generated between the electrodes 7 and 8 is minute, but if corrosion products such as scale adhere to the surfaces of the electrodes 7 and 8, the current value will further decrease. Thus, as the detection current becomes smaller, the accuracy of the detection circuit must be made more sophisticated to provide a proper warning effect. Furthermore, if the electrochemical properties of the electrode itself change, there will be a drawback that an alarm will be activated regardless of the anticorrosion effect of the cooling water. In particular, the electrodes 7 and 8 are
In order to increase the detection current, one of the electrodes is made of an electrochemically base metal, such as zinc, so that the surface becomes conspicuously contaminated.

[Means to solve the problem]

The anode electrode had a disk shape, a piezoelectric element connected to an oscillator was fixed to one side of the anode electrode, and a linear cathode electrode was provided above the anode electrode between the inner and outer cylinders.

[Effect]

When the oscillator is activated, the piezoelectric element vibrates and shakes off scale, etc. attached to the surface of the anode electrode. At the same time, the well-known water is disturbed by the vibration of the anode electrode, making it difficult for scale and the like to adhere to the surface of the anode electrode.

〔Example〕

In FIG. 1, reference numeral 15 denotes a galvano-type corrosion sensor of the present invention, which has an outer cylinder 16, an inner cylinder 17, and an electrode assembly 18 made of plastic material. Inner cylinder 17
is a cylindrical body having a core opening 19, and an outer peripheral wall 20 is provided at the upper end. The outer cylinder 17 is similarly a hollow cylindrical body, and has an inner circumferential wall 21 extending inward at its upper end. Both ends of a cathode electrode 22 are buried within the inner circumferential wall 21 . In this embodiment, the cathode electrode 22 includes two platinum wires arranged in a cross shape. In a state where the outer cylinder 16 is inserted outside the inner cylinder 17, an anode electrode 24 is sandwiched between the outer peripheral wall 21 of the inner cylinder 17 and the inner peripheral wall 21 of the outer cylinder 16 via an annular packing 23. , a piezoelectric element 25 is fixed to the lower surface of the electrode 24.
The anode electrode 24 is made of a disk-shaped zinc plate, and the piezoelectric element 25 is made of a ceramic thin plate. Conductive wires 28 and 29 are connected to the anode electrode 24 and the cathode electrode 22, respectively, and communicate with the disker 26. Further, conductive wires 30 and 31 communicating with the oscillator 27 are connected to both surfaces of the piezoelectric element 25. These conductors 28, 29, 30, 31
passes through the center opening 19 of the inner cylinder 17 and reaches the detector 26 and the oscillator 27. Lower end 3 of core opening 19
2 is filled and sealed with a sealing material. An alarm device 33 is connected to the detector 26 . The detector 26 is a well-known type consisting of an amplifier circuit.
Anode electrode 24, cathode electrode 22, conducting wire 2
8, 29, 30, 31, and the piezoelectric element 25,
Electrode assembly 18 is formed.

The corrosion sensor 15 is used, for example, by being inserted into a cooling water system of an internal combustion engine. When the conductivity of the cooling water is low, that is, when the corrosivity is low, the current flowing between the anode electrode 24 and the cathode electrode 22 is minute, and the detector 26 is not activated.
As the cooling water becomes more corrosive and its conductivity increases, the current between the electrodes 22 and 24 increases, and the detector 2
6 is activated, the alarm 33 is started, and the time to add the corrosion inhibitor is warned. When the oscillator 27 is activated during the above period or at predetermined intervals, the piezoelectric element 2
5 and the cathode electrode 22 connected thereto vibrate. At the same time, it disturbs the surrounding cooling water. Even if corrosion products in the cooling water adhere to the surface of the anode electrode 22, they are removed. Furthermore, corrosion products are difficult to adhere to the surface of the anode electrode 22. Cathode electrode 24
Similarly, scale and the like become difficult to adhere to.

FIG. 3 shows another embodiment in which a filter 34 is provided above the cathode electrode 22.
As a result, corrosion products are further removed from the cathode electrode 2.
2. Difficult to adhere to surfaces.

〔effect〕

The corrosion sensor of the present invention has a piezoelectric element connected to an oscillator fixed to one side of the anode electrode, so that the anode electrode can be appropriately vibrated.
Prevents foreign matter such as scale from accumulating on the anode electrode surface and appropriately detects the corrosivity of cooling water.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a corrosion sensor, detector, generator, and alarm according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view of another embodiment.
Further, FIG. 4 is a sectional view of the corrosion monitoring device. 24... Anode electrode, 25... Piezoelectric element.

Claims (1)

[Scope of utility model registration request] A disk-shaped anode electrode and a piezoelectric element fixed to the electrode are attached to the upper end of a hollow plastic cylinder, a linear cathode electrode is attached above this, and conductive wires are connected to each of the anode electrode and the cathode electrode. A galvano-type corrosion sensor consisting of a piezoelectric element and conductive wires connected to both sides.