JPH0418240Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a static eliminator that eliminates static electricity using positive or negative high frequency or low frequency high voltage.

``Conventional technology'' Conventionally available static eliminators use a transformer to step up the 100V commercial AC voltage, and because it is not possible to obtain a sufficiently high voltage without using a large transformer, the power supply section However, since the transformer takes up most of the space and inevitably becomes large, it is necessary to separate the power supply section and static eliminator, install the power supply section at a distance from the static eliminator, and connect them with high-voltage cables. It was connected through.

``The problem that the invention seeks to solve'' As a result, not only did it take up a lot of installation space, but it was also expensive, troublesome to handle, and highly dangerous.

The objects of the present invention are to reduce the size of the power supply section, to integrate the power supply section and the static eliminator, to make the static eliminator replaceable, and to enable the direction of the static eliminator to be selected.

"Means for solving problems" In order to achieve this purpose, this invention
A rectifier circuit that rectifies AC power supply voltage, a high frequency oscillation circuit driven by the DC output of the rectifier circuit, a high frequency transformer that boosts the oscillation output, etc. are built into the power supply case, and on multiple sides of the power supply case, A screw hole is provided for screwing a holder that holds the base end of the static eliminating bar, and a cable insertion hole is provided through which the cable from the static eliminating bar is inserted to be connected to the high frequency transformer.

"Operation" Therefore, the AC power supply voltage is rectified into a DC voltage by the rectifier circuit, and the high frequency oscillation circuit oscillates with the DC voltage. The oscillation output is boosted by a high frequency transformer and then applied to the neutralization bar. In this case, since the transformer boosts the high frequency voltage, it is possible to extract a sufficiently high voltage even if the transformer is small. These rectifier circuits, high-frequency oscillation circuits, and high-frequency transformers are built into the power supply case, and the static elimination bar protrudes from the outside of the power supply case, so the overall structure is that the power supply section and the static elimination section are connected. The holder that holds the base end of the static elimination bar is
Since the mounting surface can be selected from multiple sides of the power supply case and fixed with screws, the direction in which the static elimination bar protrudes from the power supply case can be arbitrarily selected, and the static elimination bar can be replaced.

"Embodiment" Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

As shown in Figures 1 and 2, this static eliminator is
A static eliminating bar 2 is attached to a holder 3 on the outer surface of one side of the power supply case 1.
It is installed protrudingly by. As shown in the same figure and FIGS. 3 and 4, this static elimination bar 2 has a synthetic resin insulating supporter 5 inserted over its entire length into a metal casing 4 such as a U-shaped member that also serves as a ground electrode. A large number of electrode needles 6 are implanted therein at predetermined intervals in the longitudinal direction as follows.

That is, each electrode needle 6 is provided to protrude from an electrode needle holding ring 7, and this ring 7 is fitted into the long groove 8 of the insulating supporter 5, and the electrode needle 6 is inserted through the hole of the insulating supporter 5 from the upper surface thereof. Each of them is highlighted. After fitting a metal dielectric coupling pipe 10 into the ring 7 via a synthetic resin tube 9 so as to cover the entire ring 7, the long groove 8 of the insulating supporter 5 is inserted along its longitudinal direction to maintain this state. and is closed by a pad 11 made of the same material.
The upper edge portions 13 of both long side portions 12 of the casing 4 are bent inwardly into a C-shape, and the electrode needle 6 protruding from the upper surface of the insulating supporter 5 is attached to these upper edge portions 13.
It is located in between. Moreover, in order to sandwich the insulating supporter 5, a bent part 14 is formed in the middle part of both long side parts 12, and is bent inward in a V-shape over the entire length thereof.

At one end of the dielectric coupling pipe 10, there is a cable 16 whose coating is partially peeled off to expose the core wire 15.
The tip of the is fitted. The dielectric coupling pipe 10 and the core wire 15 are electrically connected by crushing a portion of the former and biting into the latter.

One end of the tube 9 is in close contact with the outer circumferential surface of the cable 16 coating, and the other end is constricted, and the remaining space at both ends of the long groove 8 of the insulating supporter 5 is filled with a synthetic resin filler 17. Further, both ends of the long groove 8 are closed by caps 18 and 19.

When a positive or negative high voltage is applied to such a static elimination bar 2 via the cable 16, all the electrode needles 6 are simultaneously applied due to the dielectric action between the dielectric coupling pipe 10 and the electrode needle holding ring 7. A high voltage is applied, and a discharge occurs between it and the upper edges 13 on both sides of the casing 4, which are earth electrodes.

As shown in FIG. 5, the holder 3 has a U-shaped holding part 21 integrally projecting horizontally from a vertical plate-like mounting part 20, and screw holes 22 are provided in these parts. This holder 3 has its mounting part 20 attached to the outer surface of the power supply case 1 using screws, and when held 21, one end of the casing 4 of the static elimination bar 2 is fitted and fixed with screws to eliminate static electricity. A bar 2 is detachably held on the outer surface of a power supply case 1. The power supply case 1 has a screw hole 23 that matches the screw hole 22 of the mounting part 20 of the holder 3 and a cable insertion hole through which the cable 16 is inserted so that the direction in which the static eliminating bar 2 is projected can be changed depending on the installation site. 2
4 are provided on two or more sides. Note that a rubber cover is provided to close the unused cable insertion hole 24.

Inside the power supply case 1, an electric circuit as shown in FIG. 6 is provided. This electric circuit includes a filter circuit 25, a rectifier circuit 26, and an input side constant voltage circuit 2.
7, a high frequency oscillation circuit 28, a high frequency transformer 29 using a ferrite core, and an output side constant voltage circuit 30
and a safety control circuit 31.

The filter circuit 25 includes a coil 32 and a capacitor 3
3 to prevent the high frequency from the high frequency oscillation circuit 28 from flowing back to the 100V AC power supply side.
The rectifier circuit 26 includes a bridge rectifier 34 and a resistor 35.
and a smoothing capacitor 36, which rectifies 100V alternating current to direct current. The input side constant voltage circuit 27 includes a Zener diode 37 and resistors 38,3.
9, 40 and a capacitor 41, and generates a constant DC voltage.

The high frequency oscillation circuit 28 includes a diode 42, a starting transistor 43, a control transistor 44,
Resistors 45, 46, 47, and high frequency transformer 2
9, and when a DC current rectified by the rectifier circuit 26 flows through the starting transistor 43 and turns on, a high frequency (for example 16
~20KHz) voltage. This high frequency voltage is stepped up by the high frequency transformer 29, and a positive or negative high frequency high voltage (for example 4KV) is applied between the taps 48a and 48b on the secondary side of the high frequency transformer 29.
A high frequency low voltage is output between a and 49b. The tap 48a is connected to the electrode needle 6 of the static eliminating bar 2 as described above, and the tap 48b is connected to the grounded casing 4.

The output side voltage constant circuit 30 is connected to taps 49a and 49b of the high frequency transformer 29, and includes a diode 50, a constant voltage integrated circuit 51, and a capacitor 5.
2 and 53, and rectifies the voltage between the taps 48a and 48b, and also makes it constant to produce a constant DC voltage (for example, 12V). Tap 49b
is grounded.

The safety control circuit 31 includes an abnormal current detection circuit 54, a comparison circuit 55, a light emitting diode 56 for indicating operation/stop, and a photocoupler 57. The abnormal current detection circuit 54 is connected to tap 4 of the high frequency transformer 29.
9b, capacitor 58 and resistor 5
9 and a diode 60, the tap 49a
After integrating the current flowing between the current and the ground, the current is rectified and supplied to the comparator circuit 55. This comparison circuit 55 is
An operational amplifier 60, a resistor 61 connected in series between its negative input terminal and the diode 60, a resistor 62 and a diode 63 connected between this and the ground, and a resistor 62 and a diode 63 connected between the positive input terminal of the operational amplifier 60 and the output side constant voltage circuit 30. It is composed of a resistor 64, a variable resistor 65, and a resistor 66 which are connected. A reference voltage adjusted by a variable resistor 65 is input to the positive input terminal of the operational amplifier 60. This operational amplifier 60 uses the output side constant voltage circuit 30 as a power source,
Its output terminal is a light emitting diode 56 and a resistor 67.
It is connected to the light emitting element 57a of the photocoupler 57 via.

The photocoupler 57 includes the control transistor 4
The light receiving element 57b is connected to the base of the transistor 44 and the input side constant voltage circuit 27 so as to cooperate with the transistor 4 to constitute a non-contact relay.

In such a configuration, when the power switch 68 is turned on, a high frequency high voltage is applied all at once to the many electrode needles 6 of the static elimination bar 2, and a discharge occurs between it and the casing 4, which is the ground electrode, and the electrode needles The non-electrostatic object facing 8 is electricity-eliminated. During the static elimination, for example, the electrode needle 6 of the static elimination bar 2 and the casing 4
If there is a short circuit between the casing 4 and the electrode needles 6, or if a non-electrostatic object or dust comes into contact with the electrode needles 6, an overcurrent will flow between the electrode needles 6 and the casing 4. Since the overcurrent flows to the secondary side of the high frequency transformer 29 via the taps 48a and 48b, the taps 49a and 49
It is also induced on the b side and detected by the abnormal current detection circuit 54. Then, in the comparison circuit 55,
Since the voltage input to the negative input terminal of the operational amplifier 60 is higher than the reference voltage input to the positive input terminal, the output of the operational amplifier 60 becomes
It changes from HIGH to LOW, and the light emitting diode 56 for indicating operation/stop that was lit until then goes out.
Along with this, the light-emitting element 57a of the photocoupler 57, which had been lit, also goes out, and its light-receiving element 57b turns off. Therefore, the control transistor 44 whose base is connected to the light-receiving element 57b is turned on, and accordingly, the base of the starting transistor 43 is grounded and the transistor 43 is turned off, causing the high-frequency oscillation circuit 28 to oscillate. The operation automatically stops and high frequency high voltage is no longer applied to the electrode needle 6 of the static eliminating bar 2.

Further, the abnormal current detection circuit 54 is connected to the tap 49.
Since an output is generated both when the voltage between a and 49b suddenly rises or falls, the oscillation operation of the high frequency oscillation circuit 28 is automatically stopped in such cases as well.

"Effects of the Invention" As described above, the static eliminator of the present invention has the following effects.

A high-frequency oscillation circuit generates high-frequency oscillation, and the output is boosted by a high-frequency transformer to apply a high-frequency high voltage to the static elimination bar. Even though the high-frequency transformer is small, it can extract a sufficiently high voltage, so it is not possible to use conventional low-frequency The power supply section can be made smaller than those using transformers, and there is less energy loss.

Since the power supply section can be made smaller in this way,
By attaching a static elimination bar to the case, it is possible to integrate the power supply section and the static elimination section, so to speak, so it is easier to handle and safer than conventional systems in which they are separated and connected by a cable.

The static elimination bar is removably attached to the power supply case, so it can be replaced.

Screw holes for screwing the holder that holds the base end of the static elimination bar and cable insertion holes for passing the cable from the static elimination bar are provided on multiple sides of the power supply case, making it easy to eliminate static electricity from the power supply case. The protruding direction of the bar can be arbitrarily selected depending on the installation site.

[Brief explanation of the drawing]

The drawing shows an example of the static eliminator according to the present invention.
The figure is a side view, Figure 2 is a plan view, Figure 3 is a side view with the upper half of the neutralization bar cut away, Figure 4 is a sectional view of it, and Figure 5 is a perspective view of the holder that holds it in the power supply case. 6 are electrical circuit diagrams. 1... Power supply case, 2... Static elimination bar, 3... Holder, 16... Cable, 23... Screw hole, 24
... Cable insertion hole, 26 ... Rectifier circuit, 28 ...
...High frequency oscillation circuit, 29...High frequency transformer.

Claims (1)

[Scope of utility model registration request] A rectifier circuit that rectifies the AC power supply voltage, a high frequency oscillation circuit driven by the DC output of the rectifier circuit, a high frequency transformer that boosts the oscillation output, etc. are built into the power supply case, and the , a screw hole for screwing a holder that holds the base end of the static elimination bar, and a cable insertion hole through which the cable from the static elimination bar is inserted in order to connect the cable to the high frequency transformer. Static eliminator.