JPS645360Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wireless discharge tube lighting device that does not have any conductive exposed parts for use underwater or in coal mines. A coil is wound around the annular core, and a discharge tube is directly connected between both terminals of the coil, so that when no discharge current flows, the discharge starting voltage of the discharge tube appears between the terminals of the coil, and when discharge starts, a constant current flows. As a result, there is no need to provide a separate lighting circuit, the circuit configuration is extremely simple, and it can be moved to any position along the existing power line.
In addition, since power can be supplied from the power line without connecting any electric wires and the conductive parts are not exposed at all, it can be used safely even in conductive current or explosive gas atmospheres.

Conventionally, when installing lighting equipment underwater, it is common to connect the required number of lighting equipment along the power line before submerging it, and it is not possible to install an outlet with exposed conductive parts. In addition, even if you perform connection work with the power turned off, insulation will not be sufficient underwater, so it is technically difficult to add lighting equipment to the same power line or change its connection position later. It was extremely difficult.

The purpose of this invention is to improve the shortcomings of the conventional devices mentioned above, and with a simple circuit configuration, it is possible to receive power from the power line without connecting electric wires, and it can be installed at any position along the existing power line. To obtain a wireless discharge tube lighting fixture that can be freely moved anywhere.

An embodiment of this invention will be described with reference to FIG.

AC power lines for power, etc. (2 or 3 for single phase)
An annular iron core 2 made of a grain-oriented silicon steel plate is loosely fitted to one of the three electric wires 1 (in the case of a phase), so that it can move freely along the electric wire 1.

A coil 3 is wound around the annular core 2 many times (for example, several hundred to several thousand turns), and both terminals of the coil 3 are connected to a fluorescent lamp 4.
are connected to each electrode terminal 5 of.

The electric wire 1, coil 3, electrode terminal 5, and their connecting portions are completely covered with an insulating member so that no conductive portions are exposed.

Next, its operation will be explained.

Before the fluorescent lamp 4 starts discharging, no load current flows through the coil 3, so the current flowing through the wire 1 is I ₀
When the value of is increased beyond a certain level, the annular core 2 becomes saturated as shown in FIG. 2A.

Therefore, a voltage E ₀ as shown in FIG.
The current I _{0 flowing through the wire 1 increases as the current I 0} increases.

Commercially available fluorescent lamps of about 7W to 40W are connected between both electrodes.
If a voltage of 600V to 1000V is applied, discharge will start even if the heater is not lit, so if the peak value of the terminal voltage _E0 of coil 3 exceeds the above voltage, fluorescent lamp 4 will start discharging. However, as shown in FIG. 3, a steady state is reached at a current slightly smaller than I ₀ /n (n is the number of turns of the coil 3).

In coal mines etc., as shown in Figure 4,
If the necessary number of these wireless discharge tube lighting devices are hung from a special electric wire 1 connected to a constant current power source 6 and routed around the mine, it is extremely safe, and when moving the installation location, It is very convenient because it is only necessary to slide the annular iron core 2 along the electric wire 1 to a desired position.

By increasing the frequency of the constant current power source 6 to about several hundred hertz, the annular core 2 can be made extremely small (for example, 3 to 4 cm in diameter), and the number of turns of the coil 3 can also be reduced, making the device smaller. can do.

If the number of lighting fixtures is small, the power consumption is relatively small, so they can be attached to existing power lines such as power lines that constantly carry a large load current, and the installation work is simple and safe.

Although a commercially available fluorescent lamp is used in the above embodiment, other discharge tubes that operate at high voltage and low current may also be used.

As explained above, in the wireless discharge tube lighting device of this invention, a coil is wound around an annular core with an AC power line loosely passed through it, and a discharge tube is directly connected between both terminals of the coil, and when no discharge current flows, the coil is By making it possible for a constant current to flow when the discharge starting voltage of the discharge tube appears between both terminals of the discharge tube and starting discharge, there is no need to provide a separate lighting circuit, making the circuit configuration extremely simple and allowing it to be installed along the existing power supply line. It can be moved to any desired position, and it can receive power from the power line without connecting any wires, making it safe as no conductive parts are exposed. It can be used even in gas atmospheres.

[Brief explanation of drawings]

Figure 1: Principle diagram of the embodiment of this invention, Figure 2...
FIG. 3 shows the magnetic flux in the annular core and the terminal voltage of the coil. FIG. 4 shows the voltage-current characteristics of the coil. An embodiment in which a large number of wireless discharge tube lighting devices of this invention are installed. 1... Electric wire, 2... Annular iron core, 3... Coil,
4... Fluorescent lamp, 5... Electrode terminal, 6... Constant current power supply.

Claims (1)

[Claims for Utility Model Registration] (1) A single electric wire through which a current flows loosely runs through an annular core around which a coil is wound, and both terminals of the coil are directly connected to both electrode terminals of a discharge tube, and a discharge A wireless discharge tube lighting device characterized in that when no current flows, a discharge starting voltage of the discharge tube appears between both terminals of the coil, and when discharge starts, a constant current flows. (2) The wireless discharge tube lighting device according to claim 1, which is characterized in that a required number of lamps are provided along an electric wire connected to a constant current power supply.