JPS5910563Y2 - Structure of ice thickness detection electrode - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of an ice thickness detection electrode. The present invention relates to the structure of a detection electrode for preventing malfunctions in detecting ice thickness due to sudden changes in the flow rate of cooling water.

Conventionally, ice thickness detection devices have been used in water cooling systems called ice banks to optimize the thickness of ice formed on the cooling surface. This is done by detecting the difference in electrical conductivity between water and ice.

In order to eliminate the influence of the temperature gradient in the normal direction to the frozen surface, the electrode rod used for this purpose has a ring-shaped, disc-shaped, or hemispherical electrode attached to the tip of a thermally and electrically insulating rod-shaped support. Electrodes have been developed that penetrate the body and connect terminals and the electrodes with extremely thin metal wires, metal foils, semiconductors, etc. in order to reduce thermal conductivity and provide electrical continuity. .

This is placed facing the freezing tube, and when the frozen layer grows to a certain extent and reaches the electrode part at the set position, the electrode surface is covered with the frozen layer,
Since the electrical conductivity of ice is extremely low, the electrical resistance increases rapidly, and by detecting this and controlling the flow rate of refrigerant or brine in the cooling pipe, the thickness of the frozen layer can be controlled. It is.

In this case, the effect of the temperature gradient of the cooled water flowing along the frozen surface on the electrode is eliminated by the thermal insulation structure described above, but as the electrode surface and the frozen surface come closer, the gap between the The flow rate of the water to be cooled at this point increases compared to that at other freezing surfaces, and the rate of ice formation covering the electrodes lags behind.

Furthermore, during melting after freezing, a sudden change in flow velocity also occurs at a time when it is necessary to create a gap between the electrode surface and the frozen surface.

In the case of controlling the ice thickness in which such a process is constantly repeated, the followability is degraded, causing problems.

The present invention has been developed in view of this point, in which an annular electrode is provided on an electrically and thermally insulating rod-shaped support, and a terminal and the electrode are connected in a waterproof manner by penetrating the support and having a low thermal conductivity. In the ice thickness detection electrode connected with a thin wire etc., at one end of the annular electrode,
A thermally insulating pre-icing end with the same outer diameter as this is provided.

Fig. 1 is a schematic diagram thereof, and Fig. 2 is an example of a detailed drawing of a detection electrode. 1 is a freezing tube in which a refrigerant or brine flows, 2 is a freezing layer, 3 is water to be cooled, 4 is an annular electrode, 5 1 is an electrical and thermally insulating support, 6 is a conductive wire with low thermal conductivity, 7 is an eyeliner, 8 is a thermally insulating pre-frozen end, and 9 is a terminal.

In the figure, screws are provided on the front and back protrusions of the annular electrode 4 to form an electrode that integrates the leading freezing end 8 and the insulating support 5, but the annular electrode is made of electrically and thermally insulating resin. There is no harm in constructing it as one with other training materials.

In this case, in order to prevent a sudden change in the flow of the water to be cooled when passing through the ring-shaped electrode 4 at a certain length of the frozen layer, the leading ice-forming end 8 is designed to have a diameter that is externally equal to that of the ring-shaped electrode 4. It is necessary that there be.

When freezing occurs, if the preceding freezing end 8 is frozen in advance, there will be no sudden change in the flow of the water to be cooled at the position of the annular electrode 4 at the set position.

On the other hand, since the thermally insulating pre-frozen end 8 is a thermally insulating material,
The temperature on the annular electrode 4 caused by the influence of heat transfer to the annular electrode and the temperature gradient of the cooled water is also reduced because the thermally insulating material of the support 6 and the conductor connecting the electrode 4 and the terminal 9 are made of a low thermal conductive material. Since the temperature of the annular electrode 4 always follows the temperature of the frozen surface, the thickness of the frozen layer can be detected as a resistance change between water and ice.

As mentioned above, the electrode for detecting the thickness of ice is not affected by the temperature gradient of the water to be cooled, and there is no sudden change in the flow velocity of the water to be cooled around the electrode when freezing occurs. Since it is possible to detect the ice length and melting processes extremely accurately and without malfunction, it is most suitable for detecting ice layer thickness as a warning or for constant value control of ice layer thickness.

[Brief explanation of the drawing]

Fig. 1 shows an example of the ice formation thickness detection electrode according to the present invention, and Fig.
The figure is a detailed diagram showing an example of a detection electrode. 1: Freezing tube, 2: Freezing layer, 3: Water to be cooled, 4: Annular electrode, 5: Electrical, thermally insulating support, 6: Low thermal conductive conductor, 7
: Output wire, 8: Heat insulating pre-frozen end, 9: Terminal.

Claims (1)

[Scope of utility model registration request] In an ice formation thickness detection electrode in which a ring-shaped electrode is provided on a thermally and electrically insulating support, and a low thermally conductive material is used to penetrate the support and connect the terminal and the electrode in a waterproof manner, one end of the electrode is provided. The structure of the ice formation thickness detection electrode is characterized in that a thermally insulating leading ice formation end having a diameter equal to this is provided.