JPH0789519B2 - Static eliminator - Google Patents

Description

Description: [Object of the invention] (Industrial field of application) The present invention relates to a static eliminator used for removing static electricity in an insulating pipe, and particularly in a resin pipe of a dust measuring device. The present invention relates to a static eliminator suitable for removing static electricity.

(Prior Art) Generally, a static eliminator ionizes the atmosphere around a charged object by corona discharge, and supplies an electric charge to the charged object to electrically neutralize it.

A conventional static eliminator comprises a rod-shaped discharge body or a discharge body in which a plurality of the rod-shaped discharge bodies are arranged in the same plane, and a power supply device for applying an AC voltage to the discharge body.

(Problems to be solved by the invention) However, in the above-described conventional static eliminator, for example, when static electricity is removed from an insulating resin pipe made of urethane resin, vinyl chloride resin, or the like, the inside of the pipe is particularly charged. In such a case, the electrostatic field formed outside the pipe will be weak, and it will not be possible to supply sufficient charge to electrically neutralize the inside of the pipe. There is a problem that is difficult.

For example, in a dust measuring device that measures the dust concentration in a gas using a laser beam, etc., a gas sampling pipe with a diameter of about 5 mm to 20 mm made of an insulating flexible resin pipe is used to measure the dust to be measured. Many of them are configured to collect gas containing, but it is difficult to remove static electricity inside the pipe with the conventional static eliminator, and due to friction with the gas flowing inside, etc. Is charged, and the dust to be measured adheres to the inside of this pipe, which causes a problem that the dust concentration cannot be accurately measured.

The present invention has been made in consideration of such a conventional situation, and an object thereof is to provide a static eliminator capable of removing static electricity inside an insulating pipe.

[Configuration of Invention] (Means for Solving Problems) That is, according to the present invention, a plurality of rod-shaped discharge bodies, and these discharge bodies are oriented around the pipe in the pipe direction and the distance between the pipe and the pipe is 30 mm to. The rod-shaped discharge body was provided with a fixing member that holds the discharge body at a predetermined interval of 50 mm, and a voltage supply unit that applies an AC voltage to these discharge bodies to generate discharge, and the pipe side was opened. The container-shaped member, and a rod-shaped member in which a large number of needle-shaped members that are arranged so as to be substantially parallel to the pipe in the container-shaped member and project toward the pipe are connected in series, and the opening of the container-shaped member It is characterized in that discharge is generated between the end portion and the needle-shaped member. Further, the present invention is characterized in that the pipe is a gas flow pipe through which a gas is circulated, and the rod-shaped member of the discharge body has a hard chloride surrounding except for the needle-shaped member. It is characterized by being covered with vinyl.

(Operation) In the static eliminator of the present invention, a plurality of rod-shaped discharge bodies are held around the pipe at predetermined intervals in the direction of the pipe, and discharge is generated at a plurality of positions around the pipe. Then, the atmosphere around the pipe is ionized by the discharge, and an electric charge is supplied to the pipe to electrically neutralize it.

Therefore, even if the inside of the pipe is electrified and the electrostatic field formed outside the pipe is weak, the electric charge can be efficiently supplied to the entire pipe, and the entire pipe is electrically neutralized,
Static electricity inside the pipe can be removed.

(Embodiment) An embodiment of the static eliminator of the present invention will be described below with reference to FIGS. 1 and 2.

In the static eliminator 1 of this embodiment, a plurality of, for example, three rod-shaped discharge bodies 2 are arranged so as to be located at respective vertices of an equilateral triangle, and fixed by a plurality of annular fixing members 3 made of an aluminum plate or the like. And these discharge bodies 2 are
It is connected to a power supply device (AC) 4 that supplies a high voltage. A pipe 10 made of an insulating material such as vinyl chloride is arranged substantially at the center of the three discharge bodies 2. The distance between the pipe 10 and each discharge body 2 is, for example, about 30 mm to 50 mm. So that each discharge 2 is fixed.

These discharge bodies 2 are, for example, a rectangular parallelepiped container-shaped member 5 formed of an aluminum plate or the like having a plate thickness of about 3 mm and having an opening 5a formed in the surface on the center side, and a substantially central portion in the container-shaped member 5. A rod-shaped member 6 in which a large number of needle-shaped members 6a arranged in parallel with the longitudinal direction and projecting toward the opening 5a are provided in series.
It consists of and.

The container-shaped member 5 has a width b of, for example, 25 mm and a thickness c of, for example,
The length is 15 mm, and the length is, for example, about 1000 mm and is formed in a container shape. The rod-shaped member 6 has a diameter of 5 mm to 10 mm, for example.
Approximately stainless round bar or the like as the core material 6b, a needle-like member 6a made of stainless steel or the like having a diameter of, for example, 0.3 mm and a length of, for example, 5 mm is provided on the core material 6b at intervals such as 10 mm to 15 mm in the longitudinal direction of the core material 6b Are fixed in line with each other, and except the needle-shaped member 6a, the periphery is covered with an insulating member 6c such as hard vinyl chloride.

The container-shaped member 5 is connected to the ground side of the power supply device 4, and the needle-shaped member 6a is applied with an AC voltage of, for example, about 7 kilovolts from the power supply device 4 via the core material 6b and the high-voltage cable 7. Corona discharge is generated between the needle-shaped member 6a and the end of the opening 5a of the container-shaped member 5.

In the static eliminator 1 of this embodiment having the above-mentioned configuration, the pipe 10 made of an insulating material such as vinyl chloride and through which a gas flows, for example, the dust concentration in the gas is approximately at the center of the three discharge bodies 2. Arrange the gas sampling pipes of the dust measuring device to be measured.

Then, an AC voltage of, for example, about 7 kilovolts is applied between the needle-shaped member 6a and the container-shaped member 5 by the power supply device 4, and the needle-shaped member 6a of each discharge body 2 and the end of the opening 5a of the container-shaped member 5 are connected. Generate a corona discharge during. The atmosphere around the pipe 10 is ionized by this corona discharge, and electric charges are supplied to the charged pipe 10 to electrically neutralize it.

This action extends to the inside of the pipe 10 through the wall of the pipe 10 by electrostatic induction, and the inside of the pipe 10 is electrically neutralized.

That is, in the static eliminator of this embodiment, corona discharge is generated in the three discharge bodies 2 arranged so as to surround the pipe 10, and the atmosphere around the pipe 10 is ionized.
Even if the inside of the pipe 10 is charged and the electrostatic field formed outside the pipe 10 is weak, the electric charge can be efficiently supplied.
10 Static electricity inside can be removed.

Therefore, for example, if the static eliminator 1 is arranged in the gas sampling pipe of the dust measuring device, static electricity generated inside the pipe due to friction with the gas flowing through the inside is removed, and the dust to be measured is put inside the gas sampling pipe. Can be prevented, and the dust concentration can be accurately measured.

[Effects of the Invention] As described above, in the static eliminator of the present invention, even when the inside of the insulating pipe is charged, the electric charge can be efficiently supplied to such a pipe as compared with the conventional case. The static electricity inside the pipe can be removed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a static eliminator according to an embodiment of the present invention,
FIG. 2 is a sectional view showing a main part of FIG. 1 ... Static eliminator, 2 ... Discharger, 3 ... Fixing member, 4 ...
… Power supply.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takenobu Matsuo 1-26-2 Nishishinjuku, Shinjuku-ku, Tokyo Within Tokyo Electron Co., Ltd. (72) Inventor Chizo Yamaguchi 1-226 Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Tokyo Electron Limited (72) Inventor Hitoshi Fukao 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Masayuki Imafuku 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Hidemi Nagata 599-1 Kitamikata, Takatsu-ku, Kawasaki-shi, Kanagawa 609 Tamagawa High Home 608 (56) References Japanese Patent Publication No. 44-6549 (JP, B2) Actual Publication No. Sho 49 -33198 (JP, Y2)

Claims (3)

[Claims] 1. A plurality of rod-shaped discharge bodies, and these discharge bodies are oriented around the pipe in the direction of the pipe and the distance between the pipe and the pipe is 30 mm.
A fixing member that holds the discharge body at a predetermined interval of -50 mm, and a voltage supply unit that applies an AC voltage to these discharge bodies to generate a discharge, and the rod-shaped discharge body is opened on the pipe side. A container-shaped member, and a rod-shaped member in which a large number of needle-shaped members that are arranged substantially parallel to the pipe in the container-shaped member and project toward the pipe are provided in series.
A static eliminator configured to generate a discharge between an open end of the container-shaped member and the needle-shaped member. 2. The static eliminator according to claim 1, wherein the pipe is a gas flow pipe through which gas flows. 3. The static eliminator according to claim 1, wherein the rod-shaped member of the discharge body is covered by hard vinyl chloride except for the needle-shaped member.