Electric dust collecting apparatus and manufacturing method of the same

• US 6,193,788 B1
• Filed: 03/06/1998
• Issued: 02/27/2001
• Est. Priority Date: 03/07/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisya Sbl
• Original Assignee: Kabushiki Kaisya Sbl
• Inventors: Nojima, Kouzaburou
• Primary Examiner(s): Chiesa, Richard L.
• Application Number:
  US09/035,999
• Time in Patent Office: 1,089 Days
• Field of Search: 96/97, 961/00, 96/69, 96/15, 264/241, 264/249, 264/DIG.48, 29/34.R, 298/966.2
• US Class Current: 96/97
• CPC Class Codes: B03C 2201/10 Ionising electrode has multiple serrated ends or parts
• CPC Class Codes: B03C 3/40 Electrode constructions
• CPC Class Codes: B03C 3/41 Ionising-electrodes
• CPC Class Codes: Y10T 29/49604 Filter
• CPC Class Codes: Y10T 29/5116 forging and bending, cutting or punching

Abstract

An electric dust collecting apparatus includes at least one needle electrode for charging floating particles in air by generating a corona discharge around needle points; at least one collecting electrode provided on cell-liked arrangement corresponding to the needle electrodes, for attracting and collecting the charged floating particles by an electrostatic force; and at least one deflection electrode having a rectangularly hollow longitudinal structure having a front plate portion and side plate portions wherein the needle electrodes are fixed on the front plate portion, for applying a deflection force to the charged floating particles to move toward the collecting electrodes by a potential applied from the side plate portions, and wherein the at least one deflection electrode having the rectangularly hollow longitudinal structure is obtained by bending a profile plate punched up a sheet metal by a predetermined punch press process, accordingly, the plurality of deflection electrodes can be integratedly formed from a profile punched up from a sheet metal by the punching and bending press process, enabling the manufacturing process to have workability and productivity.

Claims

1. An electric dust collecting apparatus comprising:

at least one needle electrode configured to charge floating particles in air by generating corona discharge around needle points;

at least one collecting electrode provided on cell arrangement corresponding to the needle electrodes and configured to attract and collect the charged floating particles by an electrostatic force; and

at least one deflection electrode comprising a continuous sheet of metal having a front plate portion with a mounting hole therein, a plurality of side plate portions, said sheet of metal being bent such that said plurality of side plate portions are substantially perpendicular to said face portion and edges of said plurality of side plate portions become adjacent to one another so as to form a rectangularly hollow longitudinal structure, said needle electrode being fixed in said mounting hole;

wherein said deflection electrode applies a deflection force to the charged floating particles to move said charged floating particles toward the collecting electrodes by a potential applied from the side plate portions.

2. An electric dust collecting apparatus according to claim 1, wherein

each needle electrode comprises a needle portion and a body portion, and

each body portion is engaged and tightly fixed to a respective needle electrode mounting hole with the needle electrode projected from the front plate portion.

3. An electric dust collecting apparatus according to claim 1, wherein the needle electrodes is inserted into the needle electrode mounting hole from an outside of the front plate portion and caulked from an inside of the front plate portion.

4. An electric dust collecting apparatus comprising:

a plurality of needle electrodes configured to charge floating particles in air by generating corona discharge around needle points;

a plurality of cell collecting electrodes provided in correspondence with the respective needle electrodes, and configured to attract and collect the charged floating particles by an electrostatic force; and

a plurality of deflection electrodes each comprising a continuous sheet of metal having a front plate portion with a mounting hole therein, a plurality of side plate portions, said sheet of metal being bent such that said plurality of side plate portions are substantially perpendicular to said face portion and edges of said plurality of side plate portions become adjacent to one another so as to form a rectangularly hollow longitudinal structure, said needle electrode being fixed in said mounting hole;

wherein each of said deflection electrodes applies a deflection force to the charged floating particles to move toward the collecting electrodes by a potential applied from the side plate portions,

the plurality of deflection electrodes are grouped into units, each of the units having N (integer of 2 or greater) number of deflection electrodes coupled with a first connecting portion therebetween; and

the rectangularly hollow longitudinal structures are arranged in a three-dimensional integrated piece.

5. An electric dust collecting apparatus according to claim 4, wherein

the rectangularly hollow longitudinal structures are arranged in series in the three-dimensional integrated piece.

6. An electric dust collecting apparatus according to claim 5, wherein

two of said first connecting portions are opposite to each other after bending, and the rectangularly hollow longitudinal structures have a predetermined interval and are arranged in series in the three-dimensional integrated piece.

7. An electric dust collecting apparatus according to claim 6, wherein

bottom parts of the units of group electrodes are mechanically and electrically coupled together with a plurality of comb coupling members;

and

the plurality of comb coupling members are mechanically and electrically engaged with the pair of second connecting portions.

8. An electric dust collecting apparatus according to claim 6, wherein

the units of group electrodes are mechanically and electrically coupled by rod coupling members penetrated into coupling holes formed on the first connecting portions with a predetermined interval, thereby fix the plurality of group electrodes together by the rod coupling members in a complete piece.

9. An electric dust collecting apparatus according to claim 6, wherein the needle electrodes are arranged on substantially central positions on each of the front plate portions of the deflection electrodes in alignment.

10. An electric dust collecting apparatus according to claim 4, wherein the

M (integer of 2 or greater) number of said units having the N number of deflection electrodes are provided and coupled to each other through second connecting portions, thus M times N number of deflection electrodes are provided as said plurality of deflection electrodes.

11. An electric dust collecting apparatus according to claim 4, wherein the needle electrodes is inserted into the needle electrode mounting hole from an outside of the front plate portion and fixed to the front plate portion by a brazing joint.

12. An electric dust collecting apparatus comprising:

a plurality of deflection electrodes each having a needle electrode configured to charge floating particles in air by generating corona discharge around needle points;

a collecting electrode provided on cell arrangement corresponding to the needle electrodes, and configured to attract and collect the charged floating particles by electrostatic force; and

the deflection electrode comprising a continuous sheet of metal having a front plate portion with a mounting hole therein, a plurality of side plate portions, said sheet of metal being bent such that said plurality of side plate portions are substantially perpendicular to said face portion and edges of said plurality of side plate portions become adjacent to one another so as to form a rectangularly hollow longitudinal structure, and a needle electrode fixed in said hole,

wherein said deflection electrode applies a deflection force to the charged floating particles to move toward the collecting electrodes by a potential applied from the side plate portions,

the needle electrode is made up of a stainless steel, and

a needle portion thereof is applied by a nickel plating of 2 to 10 μ

m thick.

13. A method of manufacturing an electric dust collecting apparatus including:

at least one needle electrode for charging floating particles in the air by generating a corona discharge around a needle point of the needle electrode;

at least one collecting electrode provided in a cell arrangement corresponding to the needle electrode, the collecting electrode attracting and collecting the charged floating particles by an electrostatic force; and

at least one deflection electrode having a rectangularly hollow longitudinal structure comprised of a front plate portion and side plate portions, wherein the needle electrode is fixed to the front plate portion, the deflection electrode applying a deflection force to the charged floating particles to move the particles to the collecting electrode under the influence of a potential of the side plate portions, the method comprising the steps of;

applying a punch press process to a sheet metal to obtain a profile plate for forming the rectangularly hollow longitudinal structure; and

bending the profile plate in a longitudinal direction of the plate to form the side plate portions and the front plate portion of the rectangularly hollow longitudinal structure, thereby forming the at least one deflection electrode.

14. A method of manufacturing an electric dust collecting apparatus including a plurality of needle electrodes for charging floating particles in the air by generating a corona discharge around each of needle points of the needle electrodes;

a plurality of cell-shaped collecting electrodes corresponding to the needle electrodes, the collecting electrodes attracting and collecting the charged floating particles by an electrostatic force; and

a plurality of deflection electrodes each having a rectangularly hollow longitudinal structure comprised of a front plate portion and side plate portions, wherein each of the needle electrodes is fixed to the front plate portion, applying a deflection force to the charged floating particles to move the particles to the collecting electrode under the influence of a potential of the side plate portions, the method comprising the steps of;

determining a predetermined number of the deflection electrodes provided in at least one unit, wherein N (an integer of 2 or more) is the number of the deflection electrodes of the unit each having the rectangularly hollow longitudinal structure coupled with a connecting portion therebetween;

punching a sheet metal to form a profile plate of the rectangularly hollow longitudinal structures; and

bending the profile plate to form the rectangularly hollow longitudinal structures each having the side plate portions and the front plate portion both formed by the step of punching, thereby forming the rectangularly hollow longitudinal structures into a three-dimensional integrated piece.

15. A method according to claim 14, wherein the profile plate is bent to to form a series of the rectangularly hollow longitudinal structures;

and, each of the structures having the side plate portions and the front plate portion coupled with the connecting portions therebetween;

whereby the deflection electrodes each having the rectangularly hollow longitudinal structure are formed into the three-dimensional integrated piece.

16. A method according to claim 14, further comprising

determining M number of said units having the N number of deflection electrodes to be provided; and

coupling said units together using second connecting portions, thus M (integer of 2 or greater) times N number of the deflection electrodes are provided as said plurality of deflection electrodes.

17. A method of manufacturing an electric dust collecting apparatus including:

a plurality of needle electrodes for charging floating particles in the air by generating a corona discharge around each of needle points of the needle electrodes;

a plurality of cell-shaped collecting electrodes corresponding to the needle electrodes, each of the collecting electrodes attracting and collecting the charged floating particles by an electrostatic force; and

a plurality of deflection electrodes each having a rectangularly hollow longitudinal structure comprised of a front plate portion and side plate portions, wherein each of the needle electrodes is fixed to the front plate portion, the deflection electrode applying a deflection force to the charged floating particles to move the particles to the collecting electrode under the influence of a potential of the side plate portions, the method comprising the steps of;

providing needle electrodes, each having a needle portion and a body portion;

applying a punch press process to a sheet metal to form a profile plate for forming at least one of the deflection electrodes;

providing a needle mounting hole at a substantially central portion of the front plate portion, a diameter of which hole is smaller than that of the body portion;

inserting the needle electrode into the needle electrode mounting hole by applying an impact to the needle electrode from back of the front plate; and

bending the profile plate in its longitudinal direction to form the deflection electrode;

whereby the needle portion of the needle electrode is projected from the front plate portion and the body portion of the needle electrode is tightly fixed to the needle electrode mounting hole.

18. A method according to claim 17, wherein the deflection electrodes are coupled with a connecting portion, and a comb-shaped coupling member is mechanically and electrically engaged with a pair of the connecting portion.

19. A method according to claim 17, wherein the deflection electrodes are coupled with a connecting portion, and the deflection electrodes are mechanically and electrically coupled by rod coupling members mounted in a coupling hole formed in the connecting portion at predetermined intervals, and

whereby a plurality of the deflection electrodes are fixed by the rod coupling member to form a three-dimensional integrated piece.