JPS59127665A - Apparatus for charging particle with electricity - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus for charging particles with electricity which is easy to wire and excellent in the efficiency of charging, by providing inner discharging electrodes connected to a high-voltage power source and an acceptor electrode opposed to said discharging electrodes inside a pipe line, and further providing an outer discharging electrode electrically connected to said acceptor electrode. CONSTITUTION:A plurality of needle-shaped inner discharging electrodes 2 are provided at the outer wall of a pipe line 1 for carrying particles, in such a manner that said inner electrodes are directed to the central axis of the pipe line 1. Said primary discharging electrodes 2 are connected through lead wires 3 to a high-voltage power source 4. In addition, a central body 6 is provided through a supporting arm 5 at the center of the outlet part 1a of the pipe line 1, an acceptor electrode 7 opposed to the inner discharging electrodes 2 is provided at said central body 6, a needle-shaped outer discharging electrode 8 is provided at the top end of the central body 6, and the acceptor electrode 7 and the outer discharging electrode 8 are electrically connected with each other. Hence, corona discharge can be performed without the need to directly wire to the outer discharging electrode 8, and inner discharge can be also performed inside the pipe line at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic powder coating machine, a liquid electrostatic coating machine, or a similar particle charging device for applying static electricity to charge a liquid or powder.

Conventionally, as shown in Figure 4, when charging particles transported in a pipe a at the pipe exit, a discharge electrode C is installed at the pipe exit, and a power source d is connected to the discharge electrode C. M current is applied through the conductor e, and corona discharge is performed from this discharge electrode toward the grounded counter electrode or the object to be coated f, thereby charging the particles. In this case, since the particles are charged at the outlet of the conduit, the charging efficiency is likely to change depending on the shape of the electrode facing the flow of the particles, etc. Therefore, as shown in Figure 5, there is a ring-shaped electrode in the conduit a. After the particles are previously charged in the pipe a by the ring electrode g, they are charged again by the discharge electrode 0 at the outlet of the pipe.

In the device shown in Figure 5, a constant charging efficiency can be obtained without affecting the flow of air particles at the outlet of the pipe, but the discharge electrode C
In order to supply power to the ring electrode V, it was necessary to supply power to the ring electrode V via a conductor along with a power supply having a different voltage from the power supply d.

In addition, in this type of charging device, the particle discharge pattern 'f: cleans particles adhering to the air supply path for adjustment, the air supply path for cleaning the corona discharge electrode 1, or the inner surface of the ring-shaped electrode 1. For this reason, there is a drawback that the wiring of the conductor for feeding power to each electrode, its insulation structure, and the power feeding mechanism are complicated.

The present invention eliminates these drawbacks and provides a particle charging device with simple wiring and high charging efficiency.

The present invention uses a single power source, which charges particles within the conduit and at the same time allows power to be supplied without directly wiring to the corona discharge electrode.

The present invention will be explained below based on the embodiments shown in Figs. 1 to 3.

In Fig. 1, needle-shaped internal discharge electrodes 2 are installed outside the pipework that transports particles so as to be connected to the central axis of the plurality of main pipes l, and this -order electrode 2 is connected via a conductive wire 3. High voltage power supply 4
Connect to.

A center body 6 is provided at the center of the tB mouth portion 1m of the pipework via a support arm 5, a receiving electrode 7 is provided on the center body 6 so as to face the discharge electrode 2Q, and the tip of the center body 6 is A needle-shaped external discharge electrode 8 is provided at the receiving electrode 7 and the external discharge electrode 8 are electrically connected.

In the above configuration, when a high voltage is applied to the internal discharge electrode 2, corona discharge is generated from the internal discharge electrode 2) toward the receiving electrode 7, and this corona discharge causes particles passing through the pipe 1 to Gives a charge.

The potential of the receiving magnetic pole 7 increases as it receives this corona discharge, and this potential causes a discharge to occur from the external discharge electrode 8 toward the grounded counter electrode or the object to be coated 9, and the conduit 1 At the exit of the particle, a charge is given to the particle.

]・2 or a multi-stage charging device incorporating the present invention.

tm nij'3 eC, 11 is an internal-order electrode provided on the inner wall of the conduit 1, and the internal-order electrode 11 is connected to the high-voltage power source 4. A primary receiving electrode 12 is installed on the rear central body 13 facing the internal order electrode 11, and an internal secondary discharge electrode 14 is connected to the secondary receiving electrode 12 at the tip of the latter central body 13. connected to each other.

A ring-shaped secondary receiving electrode 15 is provided in the tR: path 1 on the outer periphery of the tip of the internal secondary discharge electrode 14 . Secondary receiving electrode 1
An internal secondary discharge electrode 17 is provided on the inner wall of the outlet portion 1a of the conduit 1 through a conductor 16' (i-) from the body 19
The tip G of this central body 19 is connected to the tertiary receiving electrode 18
An external discharge electrode 20 electrically connected to the external discharge electrode 20 is provided.

In the example shown in Fig. 2, a corona discharge is generated from the internal order electrode 11 to the primary receiving electrode 12, and due to the potential, a corona discharge is generated from the internal secondary discharge electrode 14 to the secondary receiving electrode 15. At the same time, an internal tertiary discharge occurs through the conductor 16! ' potential is transmitted to 17, and this internal secondary discharge electrode 1
Corona discharge occurs from 7 to the tertiary receiving electrode 18, the potential is transmitted to the external discharge electrode side, corona discharge occurs toward the object to be coated, etc. 9, and the particles are externally charged.

In this example, the corona discharge force 5 is generated three times in the conduit 1, and once at the tip of each conduit 1, the particles are subjected to four charges.

Figure 3 shows an external discharge electrode n and an internal order electrode 23 connected to the high voltage source 4 via a conductive wire 28 provided in opposite directions on the central body 21, and a conduit 1 on the outer periphery of the internal order discharge electrode B. A ring-shaped primary receiving electrode is installed on the inner wall of the housing, and the secondary receiving electrode is connected to the internal secondary discharge electrode 26 via the conductor 5, and a ring-shaped primary receiving electrode is connected to the internal secondary discharge electrode 26 opposite to this internal secondary discharge electrode. A screen is provided on the central body 21, and the secondary receiving electrode and the external discharge electrode are electrically connected.

In this example, corona discharge will occur three times.

In the second embodiment described above, the various air supply passages described above are provided in the same manner as shown in the figure. The same applies not only to powder particles but also to liquid particles.

As explained above, the present invention provides an internal discharge electrode connected to a high voltage power supply in a conduit, a receiving electrode provided opposite to this internal discharge electrode, and an external discharge electrode electrically connected to the receiving electrode. By providing , it is possible to conduct four discharges without having to wire directly to the external discharge electrode, and also internal charging can be performed at the same time within the circuit. The wiring and insulation structure can be made extremely simple since it is done directly.

[Brief explanation of drawings]

Figure 1 is a diagram showing one embodiment of the present invention, Figure 2 is a diagram showing another embodiment of the present invention, and Figures 3 and 3 are 2.11.14.
17, C, 26... Internal discharge electrode 7.12.15.18
, Sae, 27...Receiving electrode 8, Addition, n...External discharge electrode 4...Related pressure power supply agent Masu Yugai Saito 2 people Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] 1. An internal discharge electrode connected to a high-voltage power source is provided in the conduit, a receiving electrode is provided opposite to the internal discharge electrode, and an external discharge electrode is provided at the outlet of the conduit. A particle charging device comprising a discharge electrode and the receiving electrode electrically connected. 2 A plurality of internal discharge electrodes are provided in the conduit, a receiving electrode is provided opposite to the internal electrodes, and an external discharge electrode is provided at the outlet of the conduit, and one of the internal discharge electrodes is connected to a high voltage power source. On the other hand, the remaining internal discharge electrodes are sequentially electrically connected to the receiving electrode, and the final stage receiving electrode is electrically connected to the external discharge electrode.