JPS597939B2 - Seiden Kihatsu Seishiken Sochi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a novel static electricity generator.

More specifically, the present invention relates to a small-sized static electricity generation test device for liquids that can generate static electricity and allows easy testing of the effects of various conditions on static electricity generation. Static electricity in liquids occurs in pipes during transport, so static electricity tests are often performed using pipes.

Conventionally, in order to facilitate measurement, methods have been used to increase the flow rate of liquid to increase the amount of static electricity generated. However, since such devices use a large amount of liquid, it is necessary to investigate in detail the effects of various conditions on static electricity generation, such as polarization, moisture absorption, impurities, additives, type of liquid, and type of solid in contact with the liquid. It is difficult to do so. However, in view of these difficulties, the present invention has completed a static electricity generation test device for liquids that can easily conduct tests under the various conditions described above using a small amount of liquid.

As mentioned above, in conventional pipe testing, a large amount of liquid is flowed at a constant speed, and the static electricity generated when a steady state is reached is observed as a current value. If the amount of liquid is too small, it will flow through the pipe before reaching a constant flow rate, so a constant current value may not be observed. Therefore,
By integrating the current due to static electricity over time to find the amount of charge, and then dividing this amount of charge by the time during which the liquid is flowing, the average current can be found. The advantage of this method is that once the amount of liquid used is known, the most basic amount of electric charge (coulombs) generated per unit volume of liquid can be determined, and because it is small, it can be easily measured. Thus, based on the above findings, the present invention provides a small-sized electrostatic generation test device for liquids, which is equipped with a flow rate adjustment device and an integrator that can keep the flow rate of liquid constant.

Next, the electrostatic generation test device for liquid according to the present invention will be explained with reference to the drawings.

1 is a totalizer, 2 is an ammeter, 3 is a metal cup, 4 is a pipe, 5 is a cock, 6 is a tank, 7 is a cock, and 8 is connected to a tank 6 filled with liquid via a pipe. In order to control the flow rate of the liquid falling from tank 6 at a constant level,
This is a gas flow rate regulator that controls the inflow speed of air into the air at a constant rate, and controls the opening degree of the flow rate adjustment cock 9 to keep the air inflow rate constant.

The pipe 4 is grounded to sustain the generation of static electricity.
Close cock 5 and pour liquid into tank 6 from cock 7.
When filling the liquid, static electricity is also generated due to fluid contact with the wall of the tank, so it is desirable that the tank 6 be made of metal and grounded, or that an electrode of an arbitrary shape be placed inside the tank and grounded. Next, close Kotoku 7, open Kotoku 5,
The liquid is allowed to fall from the tank 6 through the pipe 4. In order for the liquid to fall, the amount of air that has fallen into the tank must enter the tank, but the amount of air flowing in is controlled by the gas flow regulator 8V.
Keep the air inflow speed constant with the flow rate adjustment knob 9VC attached. The static electricity generated by the fluid contact in the pipe 4 passes through the metal cup as an electrode.
Detect with a grounded ammeter, and integrate the current with time using an integrator 1VC. In order to know these situations one by one, it is desirable to connect a recorder in parallel with the totalizer 1. However, if the current is too small, it is necessary to shield cup 3. With this type of device, the amount of liquid can be several tens of milliliters.
If there is, it is possible to accurately observe the amount of generated charge and the generated current. Furthermore, when measuring the temperature dependence of the amount of static electricity generated, it is possible to adjust the temperature by wrapping a heater around the tank 6, or when testing the effect of moisture absorption, it can be placed in a device that replaces the entire tank with dry air. It is. As described above, according to the present invention, static electricity generated in a pipe due to fluid contact is detected by an ammeter connected to the ammeter and grounded, and an integrator is used to perform time integration of the current. Since this method uses a method to measure the amount of charge generated, the average current during the time the liquid is flowing can be determined with a small and simple configuration, and once the amount of liquid is known, the amount of charge generated per unit volume of liquid can be accurately determined. and easy to know.

In addition, during this measurement, according to the present invention, the inflow speed of air into the tank is kept constant in order to communicate with the tank filled with liquid and control the flow rate of the falling liquid from the tank to be constant. Since it is equipped with a gas flow rate regulator, it is possible to constantly control the flow rate of the falling liquid and detect a constant current value regardless of the amount of liquid to be measured. Therefore, it is possible to detect the amount of electric charge generated per unit volume. , it is possible to significantly improve the accuracy of measurement technology.

[Brief explanation of the drawing]

The figure is a simplified diagram of one embodiment of the invention. 1 is an integrated meter, 2 is an ammeter, 8 is a gas flow rate regulator, and 9 is a kettle.

Claims (1)

[Claims] 1. A gas flow regulator that communicates with a tank filled with liquid and controls the flow rate of air flowing into the tank to a constant level in order to control the flow rate of the liquid falling from the tank at a constant level, and a gas flow rate regulator that controls the flow rate of air flowing into the tank to a constant level, and a gas flow rate controller that communicates with a tank filled with liquid to control the flow rate of the liquid falling from the tank to a constant level, and an ammeter connected to a metal cup as an electrode for receiving the falling liquid and grounded to detect the static electricity generated by the flowing contact in the pipe; A static electricity generation test device that is equipped with an integrator that performs integration and measures the amount of generated charge.