JPH0647311A - Dust collection element of electric dust collector - Google Patents

Abstract

PURPOSE:To enhance dust collection efficiency without changing the size of a casing by providing each dust collection roll with an elliptic outer appearance consisting of curved and parts corresponding to paired straight line parts respectively connected to the curved parts and tightly to the inner surface of the casing or the straight line part of an adjacent dust collection roll. CONSTITUTION:A dust collection element B consists of a dust collection roll 4, obtained by winding up mutually insulated long strip-like anode and cathode stacked in a vortex form, which is stored in a casing 1 with an approximate elliptic cross section. In addition, so many pieces of the dust collection roll 4 are provided, the outer shape of which has a pair of straight line parts 24 which are parallel with one side of the ellipse and a pair of curve parts 25. In addition, the dust collection roll 4 is elliptic in that the end parts corresponding to the paired straight line parts 24 are respectively continuous with curve parts 25, and the straight line part 24 of each dust collection roll 4 is connected tightly to the straight line part 24 of the other dust collection roll 4 or the inner surface 11 of the casing. Thus, a clearance 52 formed by the curve part of each dust collection roll 4 and the inner surface 11 of the casing is reduced significantly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting element in an electrostatic precipitator of an electrostatic precipitator.

[0002]

2. Description of the Related Art Conventionally, in order to remove dust floating in the air, an electrostatic precipitator has been used in which dust is electrostatically charged and then electrostatically deposited. In the electric dust collector, it is the dust collecting element built in the dust collector that directly collects the dust. As shown in FIGS. 2 and 3, the dust collecting element A is generally housed by filling the casing 1 with the dust collecting roll 2 (see Japanese Patent Laid-Open No. 2-298369). This dust collecting roll 2 is provided with a long anode 22 formed by molding an insulating synthetic resin around a long electrode plate made of a flat-belt-shaped metal foil, and a large number of wavy protrusions for one cycle at predetermined intervals in the longitudinal direction. The long dust collecting electrode 23 made of a corrugated metal foil is contacted and superposed, and then wound in an elliptic spiral shape close to a circle to form a laminated body. As a result, the dust collecting roll 2 has a structure in which a large number of elongated voids 6 defined by the both electrodes 22 and 23 penetrate through the front and rear.

[0003]

The dust collecting roll 2 manufactured as described above has an elliptical shape close to a circle. For this reason,
In the dust collecting element A, when the dust collecting roll 2 is housed in the casing 1, voids 3 are generated at the four corners of the casing 1 between the casing inner surface 11 and the outer peripheral portion 21 of the dust collecting roll 2. Since there is no dust collection effect in this void portion 3, the ratio of the effective dust collection area to the cross-sectional area of the casing 1 is about 85%, and the dust collection efficiency of the dust collection element A is poor.

Therefore, an object of the present invention is to provide a dust collecting element which can improve the dust collecting efficiency without changing the size of the casing.

[0005]

According to a first aspect of the present invention, there is provided a dust collecting element in which a long strip-shaped anode and a cathode which are insulated from each other are superposed on each other, and the dust collecting roll is wound in a spiral shape. In the dust collecting element accommodated in the rectangular casing, the dust collecting rolls are provided in plural, and the outer shape of each dust collecting roll has a pair of linear portions and a pair of curved portions parallel to one side of the rectangle, It is an elliptical shape in which the corresponding end portions of the pair of linear portions are connected by the curved portions, and the linear portion of each dust collecting roll is in close contact with the inner surface of the casing or the linear portion of another dust collecting roll. It is characterized by that.

The dust collecting element according to claim 2 is characterized in that the straight line portion is parallel to the long side of the rectangle.

[0007]

According to the present invention, the radius of curvature of the curved portion of each dust collecting roll is reduced by accommodating a plurality of dust collecting rolls wound in an elliptical shape in the casing. Therefore, the gap formed by the curved portion of each dust collecting roll and the inner surface of the casing is greatly reduced as compared with the case where only one dust collecting roll is accommodated in the casing having the same cross section.

Further, by accommodating the linear portion of the dust collecting roll along the long side of the rectangular casing, the dimension of the linear portion which does not generate a gap in the casing can be increased.

[0009]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 is a sectional view of a dust collecting element according to an embodiment of the present invention. The casing 1 has a rectangular cross section,
It is a frame body whose front and rear surfaces are open, and accommodates three dust collecting rolls 4 therein. On the opened front and rear surfaces, a cover (not shown) in which only a portion corresponding to the outer shape of the dust collecting roll 4 is opened is arranged. The three dust collecting rolls 4 have linear portions 24, which will be described later, that are in the longitudinal direction.
Are housed in the casing 1 in such a manner that they are parallel to the long side of the casing 1. When the casing 1 has a square cross-sectional shape, the longitudinal direction of the dust collecting roll 4 may be parallel to any one side of the casing 1.

Referring also to FIG. 3, the dust collecting roll 4 is
Wavy strip metal foil provided with a long anode 22 formed by molding an insulating synthetic resin around a long pole plate made of a flat strip metal foil and a large number of wavy protrusions for one cycle at predetermined intervals in the longitudinal direction. A long-sized dust collecting electrode 23 composed of is contacted and superposed, and then rolled up in a spiral shape to form a laminated body. In this winding operation, the dust collecting roll 4 is rolled up into an elliptical shape, that is, both end portions are semicircular portions 25.
Then, the portion sandwiched by the semicircular portions 25 is wound up so as to form the straight portion 24. In addition, the dust collecting roll 4
The longitudinal dimension of the dust collecting roll 4 is adjusted to the dimension of the inner surface 11 of the casing 1 in the long side direction, and the width dimension of the dust collecting roll 4 is adjusted to one third of the dimension of the inner surface 11 of the casing 1 in the short side direction. The three dust collecting rolls 4 assembled as described above are housed in the casing 1 to assemble the dust collecting element B.

According to this embodiment, since the straight line portion 24 of the dust collecting roll 4 closely follows the inner surface 11 of the casing 1 or the straight line portion of the other dust collecting roll 4, a gap is formed in the straight line portion 24. Never. On the other hand, the dust collecting rolls 4 are long and slender elliptical shapes accommodated in the casing 1, and the radius of curvature of the semicircular portions 25 at both ends of the dust collecting roll 4 is an elliptical shape close to a circle as in the conventional case. Only one dust collecting roll Casing 1
The gap between the semi-circular portion 25 of the dust collecting roll 4 and the inner surface 11 of the casing 1 is extremely small, because the gap is significantly smaller than the case where the semi-circular portion 25 is housed inside. Since such a dust collecting roll 4 has its linear portion 24 arranged in parallel with the long side of the casing 1 so that the linear portion 24 has a long dimension, the semicircular portion 25 of the dust collecting roll 4 is provided.
And a void portion 51 formed by the inner surface 11 of the casing 1,
The total area of 52 is significantly reduced. Therefore, the ratio of the effective dust collection area to the cross-sectional area of the casing 1 is significantly increased (about 95% in the case of FIG. 1), and the dust collection element B is
The dust collection efficiency of is greatly improved.

The present invention is not limited to the above embodiment, and even if the number of the dust collecting rolls 4 is two, the ratio of the effective dust collecting area to the sectional area of the casing 1 is about 9.
It will be about 2%. Further, it is not necessary to limit the number of the dust collecting rolls 4, and as the dust collecting rolls 4 are elongated, the number of the dust collecting rolls accommodated in the casing 1 increases, and the dust collecting efficiency increases due to the above-mentioned reasons. .

In addition, various design changes can be made without changing the gist of the present invention.

[0014]

According to the present invention, by winding up the dust collecting roll in the shape of an elongated oval, the conventional casing is used as it is, and the void portion formed between the inner surface of the casing and the outer peripheral face of the dust collecting roll is reduced. Therefore, the dust collection efficiency of the dust collection element can be improved.

Further, if the straight part of the dust collecting roll is housed along the long side of the casing, the dimension of the straight part can be increased, and the dust collecting efficiency of the dust collecting element can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a dust collecting element according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional dust collecting element.

FIG. 3 is a partially enlarged view of a dust collecting roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 11 Casing inner surface 24 Straight part 25 Semicircular part (curved part) 4 Dust collecting roll 51 Void part 52 Void part

Claims (2)

[Claims] 1. A dust collecting element in which a long strip-shaped anode and a cathode which are insulated from each other are superposed, and which are wound up in a spiral shape are housed in a casing having a substantially rectangular cross section. A plurality of dust rolls are provided, and the outer shape of each dust collection roll has a pair of linear portions and a pair of curved portions that are parallel to one side of the rectangle, and the corresponding end portions of the pair of linear portions are curved portions. A dust collecting element characterized in that the dust collecting roll has a continuous elliptical shape, and the straight portion of each dust collecting roll is in close contact with the inner surface of the casing or the straight portion of another dust collecting roll. 2. The dust collecting element of an electrostatic precipitator according to claim 1, wherein the linear portion is parallel to a long side of the rectangle.