JPH045002Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present application relates to a corrosion monitoring device for detecting the corrosivity of cooling water for internal combustion engines and 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. 3, 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.

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 precise to provide a proper warning effect. Furthermore, although the electrodes 7 and 8 are immersed in cooling for a long period of time and current continues to flow through them, the electrochemical properties of the electrodes themselves change. As a result, a problem arises in that an alarm is activated regardless of the corrosion-preventing effect of the cooling water. In particular, since one of the electrodes 7 and 8 is made of an electrochemically base metal, such as zinc, in order to increase the detection current, the surface becomes conspicuously contaminated.

[Means for solving problems]

A galvano-type corrosion sensor consisting of a plastic body equipped with an anode and a cathode electrode is attached to the metal upper surface, and a water level detection sensor consisting of a plastic body equipped with a water level detection electrode is attached to the lower surface. It has a detection unit formed with a port and an outlet, and a control unit equipped with an alarm.
The configuration was such that the pumps were connected to the cooling water system, and the electrodes, pumps, and valves were connected to the control unit via conductive wires.

[Effect]

When it is desired to check the corrosivity of the cooling water, the cooling water is introduced into the detection unit and electricity is passed between the electrodes of the corrosion sensor. If not checked, drain the cooling water in the detection unit and do not immerse the electrode in the cooling water.

〔Example〕

FIG. 1 shows a corrosion monitoring device 20 of the present invention, which includes a detection unit 21, a control unit 22, a pump 23, a valve 24, and an alarm 25.

The detection unit 21 includes a galvano-type corrosion sensor 27 attached to the upper surface of a metal container 26, a water level detection sensor 28 attached to the lower surface, and a cooling water inlet 29 and an outlet 30 formed in the lower surface. .
The corrosion sensor 28 includes a pair of anode and cathode electrodes 32 at the lower end of a plastic body 31.
33, and these electrodes and the control unit 22 are each separately connected by conductive wires 34. Similarly, the water level detection sensor 28 also has a water level detection electrode 36 erected in the center of the plastic body 35, and the electrode is connected to the control unit 22 by a conductive wire 37.
Connect to. Water level detection electrode 36 and each of the above electrodes 3
2 and 33 face each other at a predetermined distance. Further, each electrode 32, 33, 36 is made of platinum, zinc, or stainless steel. Outlet port 3 on the bottom of the container 26
0 is connected, for example, to a cooling water system by a conduit 38 via the pump 23. The pump 23 is connected to the conductor 3
9 to the control unit 22. Receiving port 2
9 is connected to the cooling water system by a conduit 40 via a valve 24. Valve 24 is connected to control unit 22 by a lead 41.

The control unit 22 is configured to operate an alarm 25 or operate a pump 23, as well as open and close a valve 24, depending on the current value detected between each electrode, and is comprised of a normal control circuit. It is something.

FIG. 2 shows the operation panel of the control unit 22, which includes an alarm lamp 42, a main switch 43, a water supply switch 44, a detection switch 45, and a drain switch 46.

When checking the corrosivity of the cooling water, first turn on the main switch 43 and then turn on the water supply switch 44. Then, the valve 24 opens and cooling water flows from the cooling water system into the container 26 of the detection unit 21 and reaches the electrodes 32 and 33 of the corrosion sensor 27.
4 closes. When a current of a predetermined value or more flows between the electrodes 32 and 33, the control unit 22 acts and activates the alarm 25. When the check is completed, the drain switch 46 is turned on. Then, the pump 23 is started, and the cooling water in the container 26 is discharged and reaches the upper end of the water level detection electrode 36, which causes electricity to flow between the electrode and the container 26, and in response, the pump 23 is stopped. .

When the cooling water is not checked, the electrodes 32 and 33 of the corrosion sensor 27 are not immersed in the cooling water.

〔effect〕

The anode and cathode electrodes of the galvano-type corrosion sensor are immersed in cooling water and energized only when necessary, so the anode electrodes are not excessively worn out, the adhesion of scale, etc. is reduced, and responsiveness and accuracy are good. It becomes a corrosion monitoring device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a sectional view of a conventional device. 21...Detection unit, 22...Control unit, 23...Pump, 24...Valve, 27...
Corrosion sensor, 28...Water level detection sensor, 32...
Anode electrode, 33... cathode electrode.

Claims (1)

[Scope of utility model registration request] A galvano-type corrosion sensor consisting of a plastic body with an anode and a cathode electrode is attached to the top of the metal container, and a water level detection sensor consisting of a plastic body with a water level detection electrode is attached to the bottom. It has a detection unit formed with an inlet and an outlet, and a control unit connected to an alarm, and the inlet and outlet are connected to the water system via a valve and a pump, respectively, and each of the electrodes, the pump, and the valve are connected to the water system through a valve and a pump, respectively. A corrosion monitoring device in which the electrodes of the galvano-type corrosion sensor are immersed in water only during water testing.