JP2010131505A - Electrostatic dust collecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the contact state of a high voltage electrode block and a power feeding member. <P>SOLUTION: The electrostatic dust collecting device includes a charging part and a dust collecting part, and a high voltage electrode 4 of the dust collecting part is composed as a high voltage electrode block 40 formed by integrally molding a semi-insulating resin. The high voltage electrode block integrally has rod-like ribs 41 extended in the orientation direction of the high voltage electrode on both sides and a power feeding member 70 made of a metal having a U-shaped cross section having a pair of side walls and an end wall connecting the pair of the side walls over the whole length is fitted in the outer circumference of the ribs with a rectangular cross section. In the device, spring parts 72 are installed at prescribed points in the longitudinal direction of the rib of one side wall between the pair of the side walls of the power feeding member for pressurizing a power feeding part 74 set in the other side wall to have a contact with one side of two sides facing the outer circumference of the ribs by being pushed against the other side of the rib. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrostatic dust collector that collects particles by charging fine particles such as dust floating in a space.

  In recent years, in order to remove fine particles such as various kinds of dust and dust or cigarette smoke floating in the air, a charged part (ionizer) that charges fine particles by corona discharge, and charged particles charged in the charged parts are subjected to electrostatic force. Electrostatic dust collectors having a dust collection part (collector) that collects by means of the above have been developed. Among these, the dust collecting part has a configuration in which, for example, a plurality of high voltage electrodes and low voltage electrodes are alternately arranged in a direction orthogonal to the blowing direction.

  As an example of the high-voltage electrode in this case, Patent Document 1 discloses a high-voltage electrode block that is formed as a single-piece high-voltage electrode block using a semi-insulating resin.

  FIG. 11 shows an example. In this high voltage electrode block 240, a large number of high voltage electrodes (electrode plates) are arranged at regular intervals, rod-shaped ribs 241 extending in the arrangement direction of the high voltage electrodes are integrally formed on both sides, and the ribs 241 on both sides are integrally formed. Thus, a large number of high-voltage electrodes arranged between the ribs 241 are integrally connected and integrally molded with a semi-insulating resin having a volume resistance value of 108 to 1013 Ω · cm.

In the electrostatic precipitator using the high-voltage electrode block 240, the outer periphery of at least one rib 241 formed in a rectangular cross section covers the end surface of the outer periphery of the rib 241 and two opposing side surfaces on both sides thereof. Further, by fitting a metal power supply member 270 having a U-shaped cross section over the entire length, power is supplied to each high voltage electrode of the high voltage electrode block 240 via the power supply member 270.
Japanese Patent No. 3688878 (FIG. 4)

  By the way, when using the high-voltage electrode block 240 molded with a semi-insulating resin as described above, if the contact between the power supply member 270 and the high-voltage electrode block 240 is insufficient, a large contact resistance is generated at a contact failure point. A situation occurs in which a sufficiently high voltage cannot be supplied to each high-voltage electrode. In particular, in the case of an injection molded product, if the rib 241 of the high-voltage electrode block 240 is somewhat uneven, warped, or distorted, when the power supply member 270 having a U-shaped cross section is fitted, the rib 241 and the power supply member 270 are interposed. Since a gap is generated and a stable contact state cannot be obtained, power supply to the high-voltage electrode block 240 may be insufficient.

  In view of the above circumstances, an object of the present invention is to provide an electrostatic precipitator that can stabilize the contact state between a high-voltage electrode block and a power supply member and can sufficiently supply power to the high-voltage electrode block. To do.

  In the first aspect of the present invention, a plurality of high-voltage electrodes disposed so as to cross the air passage, and a rib portion that connects the end portions of the high-voltage electrodes via a connecting portion are integrally formed of a semi-insulating resin. An electrostatic dust collecting device provided with a high-voltage electrode block and having a power supply member made of a conductive material disposed on the outer periphery of the rib portion excluding the connecting portion. Using the elasticity of the metal material at the portion of the power supply member facing the other of the two side surfaces facing the outer periphery of the rib portion while arranging the power feeding portion at the portion of the power feeding member facing one of the side surfaces An urging portion is formed, and the feeding portion is pressed against the outer periphery of the rib portion by the urging force of the urging portion.

  A second aspect of the present invention is the electrostatic dust collector according to the first aspect, wherein the urging portion is constituted by a section that is bent toward the feeding portion. And

  The invention of claim 3 is the electrostatic dust collector according to claim 1 or 2, characterized in that the urging portion is provided at least in the vicinity of both ends in the longitudinal direction of the power supply member. To do.

  Invention of Claim 4 is an electrostatic dust collector of any one of Claims 1-3, Comprising: While providing the flame | frame in which the said high voltage | pressure electrode block is accommodated, the said outer periphery of the said rib is opposite. In a state where the power feeding member is assembled to the rib between the convex portion between the two side surfaces, a small hole and the power feeding member are assembled to the rib portion at a portion facing the convex portion of the power feeding member. The high-voltage electrode block in a state of being mounted on the frame, and a concave portion in which the convex portion protruding from the small hole is accommodated in the frame. The concave portion expands the high-voltage electrode block. It is set to the dimension which anticipated the expansion allowance at the time of doing.

  According to the first aspect of the present invention, even when the rib has some unevenness, warpage, or distortion, the feeding portion of the feeding member can be tightly adhered to the outer surface of the rib due to the biasing force of the biasing portion. Contact between the member and the high-voltage electrode block can be stabilized. Therefore, a large contact resistance can be prevented from being generated on the contact surface, and sufficient power can be supplied to the high voltage electrode block.

  According to the invention of claim 2, since the urging portion is configured by attaching a bending hook to the feeding portion side of the section formed on the feeding member, it can be easily manufactured by press working and manufactured. An increase in cost can be suppressed.

  According to the third aspect of the present invention, it is possible to stabilize the contact of the power supply member with the rib over the entire length by arranging the urging portion with high efficiency.

  According to invention of Claim 4, positioning of a high voltage | pressure electrode block and a power feeding member can be performed easily by fitting the small hole of a power feeding member in the convex part provided in the rib. Further, the high voltage electrode block can be easily positioned with respect to the frame by engaging the convex portion of the high voltage electrode block protruding from the small hole with the concave portion of the frame. In addition, the recesses of the frame are dimensioned to allow for the expansion allowance when the high-voltage electrode block expands, so that the expansion of the high-voltage electrode block can be absorbed and the high-voltage electrode block interferes with the frame due to the expansion. Can be prevented from warping.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an exploded perspective view of the electrostatic dust collector of the embodiment, FIG. 2 is an external perspective view of an assembly of main parts of the dust collector of the electrostatic dust collector, and FIG. (A) is a perspective view of the power supply member viewed from one direction, (b) is a perspective view of the power supply member viewed from the opposite direction to (a), and FIG. 4 is a perspective view illustrating the configuration of the high-voltage electrode block 40. 5 is a diagram showing the relationship between the rib 41 and the power supply member 70, (a) is a diagram showing a state before the power supply member 70 is fitted to the rib 41, (b) is a diagram showing a state after the fitting, FIG. FIGS. 7A and 7B are perspective views of the entire appearance of the high-voltage electrode block 40 in a state where the power supply member 70 is fitted to the rib 41, respectively, and FIG. 7 is an enlarged perspective view of a portion VII in FIG. FIG.

  As shown in FIG. 1 and FIG. 2, this electrostatic dust collector M is made of an integrally molded product of insulating resin, and is combined with each other to form an apparatus housing 10 and a collector frame. 20, a plurality of discharge lines (ionization lines) 1 assembled to the ionizer frame 10, a long plate-shaped power supply plate 50 that supplies power to the discharge lines 1, and a low-voltage electrode block (grounding) assembled to the ionizer frame 10 Block) 30, a high voltage electrode block (hot block) 40 assembled to the collector frame 20, a ground contact member 60 for connecting the low voltage electrode block 30 to the ground side, and a high voltage electrode block for supplying power to the high voltage electrode block 40. The power supply member 70 mounted on the front panel 40 and the preffixed mounted on the front surface of the ionizer frame 10. And it is configured to include a data holding 80.

  As the discharge wire 1, for example, a metal wire such as a tungsten wire, a plated wire or a clad wire in which the surface of a wire rod rich in tensile strength is coated with platinum or the like can be used. The low voltage electrode block 30 is made of conductive resin or metal. The high-voltage electrode block 40 is made of a conductive or semi-insulating resin or metal, and the ground contact member 60 and the power supply member 70 are made of a conductive member (for example, metal).

  As shown in FIG. 1, this electrostatic dust collector M, in principle, is placed in the flowing air arranged on the upstream side in the blowing direction (direction of arrow F) of the blowing path set in the apparatus. A charging unit A that charges the contained fine particles, and a dust collecting unit B that is arranged on the downstream side of the charging unit A and collects the particles charged by the charging unit A by electrostatic force are provided. . The charging unit A includes a plurality of discharge lines 1 arranged at intervals in a plane orthogonal to the blowing direction so as to cross the blowing path, and a counter electrode 2 arranged at a predetermined interval from the discharge line 1. It has. Moreover, the dust collection part B is equipped with the high voltage electrode 4 and the low voltage electrode 3 which were alternately arranged in the direction orthogonal to the ventilation direction F so that a ventilation path may be crossed.

  The counter electrode 2 of the charging unit A and the low voltage electrode 3 of the dust collecting unit B are integrally formed on one surface and the other surface of the low voltage electrode block 30, and the low voltage electrode block 30 is a peripheral wall of the ionizer frame 10. It is connected to the ground through the ground contact member 60 mounted in the mounting port 62. In addition, the discharge line 1 of the charging unit A is connected to a high-voltage supply source via the power supply plate 50.

  Further, the high voltage electrode 4 of the dust collection part B is formed in the high voltage electrode block 40 and is connected to a high voltage supply source via a power supply member 70 attached to the high voltage electrode block 40.

  As shown in FIG. 4, the high-voltage electrode block 40 has a large number of high-voltage electrodes (electrode plates) 4 arranged at regular intervals, and rod-shaped ribs 41 extending in the arrangement direction of the high-voltage electrodes 4 are integrally formed on both sides. A large number of high voltage electrodes 4 arranged between the ribs 41 are integrally connected by ribs 41 on both sides thereof, and are integrally formed by a semi-insulating resin having a volume resistance value of 108 to 1013 Ω · cm. It is molded into.

  The ribs 41 on both sides are formed in a rectangular cross section, and the outer circumference of both ribs 41 formed in the rectangular cross section is covered over the entire length so as to cover the end face 41a on the outer circumference of the rib 41 and the two opposing side faces 41b and 41c on both sides. A power supply member 70 formed by molding a long metal plate into a U-shaped cross section is fitted. Then, power is supplied to each high-voltage electrode 4 of the high-voltage electrode block 40 through these power supply members 70.

  As shown in FIG. 3, the power supply member 70 is produced by pressing a plate steel material having elasticity, and the main body 71 includes a pair of side walls 71 b and 71 c and a pair of side walls 71 b and 71 c. The power feeding member 71 is assembled to the rib 41 so that the side wall 71b faces the side surface 41b of the rib 41 and the side wall 71c faces the side surface 41c of the rib 41, respectively.

  As shown in FIGS. 3 and 5 to 7, the rib 41 has a predetermined position in the length direction of the rib 41 on one side wall 71 c of the pair of side walls 71 b and 71 c of the main body 71 of the power supply member 70. A spring as an urging portion that presses against one of the two side surfaces 41b and 41c on the outer periphery and presses the power feeding portion 74 set on the other side wall 71b against the other side surface 41b of the rib 41. A portion 72 is provided.

  The spring portion 72 is provided at least at both ends in the longitudinal direction of the power supply member 70 or at positions close thereto, and the other side wall 71c is formed by making a cut 72a (see FIG. 3B) in the width direction on one side wall 71c. It is configured as an inward bending bend attached to a section made independent of the portion.

  Further, the spring portion 72 is provided with a rectangular opening 72b and a bent portion 72c (see FIG. 5) bent inwardly into a U-shape. The bent portion 72c is provided as a portion that engages with a notch 41d provided at a corresponding portion of the side wall 71c of the rib 41. The spring portion 72 may be additionally provided in the middle portion of the power feeding member 70 in the longitudinal direction. The power supply member 70 is provided with a bracket 78.

  Thus, by providing the spring part 72 on one of the two side walls 71b and 71c of the opposing power supply member 70 having a U-shaped cross section, a resin molded product is obtained by the force of the spring part 72. Even if the rib 41 is somewhat uneven, warped, or distorted, as shown in FIG. 5B, the power feeding portion 74 can be strongly adhered to the side surface 41b of the rib 41 as indicated by the arrow K, and the power feeding member Contact between the high voltage electrode block 40 and the high voltage electrode block 40 can be stabilized. Therefore, the contact resistance at the contact surface can be reduced, and sufficient power can be efficiently supplied to the high-voltage electrode block 40.

  Further, since the spring portion 72 in this case is constituted by a section which is cut into the one side wall 71c of the power supply member 70 and made independent, it can be easily manufactured by pressing. Moreover, since the spring part 72 is arrange | positioned at the both ends of the electric power feeding member 70 at least, or its vicinity, the arrangement | positioning of the efficient spring part 72 can aim at the stabilization of the contact with respect to the rib 41 of the electric power feeding member 70 over the full length. .

  In addition, as a configuration for positioning, as shown in FIG. 3A, a slot-like small hole 73 for positioning is provided in the end wall 71a in the vicinity of both ends of the power feeding member 70. A total of four small holes 73 are provided in each of the power supply members 70, with two small holes 73 as one set.

  On the other hand, as shown in FIG. 4 and FIG. 7, the end face 41 a on the outer periphery of the rib 41 of the high-voltage electrode block 40 is provided with a convex portion 43 that protrudes outward after being fitted into the small hole 73 of the power supply member 70. It has been.

  Further, as shown in FIGS. 8 and 9, the convex portion 43 of the rib 41 of the high voltage electrode block 40 protruding from the small hole 73 of the power supply member 70 is engaged with the collector frame 20 that accommodates the high voltage electrode block 40. Thus, a recess 23 for positioning the high-voltage electrode block 40 with respect to the collector frame 20 is provided.

  As shown in FIG. 9A, the recess 23 in this case is set to a dimension that allows for the expansion allowance S due to moisture absorption during cleaning of the high-voltage electrode block 40, and the inner surface on the inner side of the recess 23 is convex. The high voltage electrode block 40 is positioned with respect to the collector frame 20 by being used for restricting the position of the portion 43. As shown in FIG. 8, a gap d that allows expansion of the high-voltage electrode block 40 is secured between the collector frame 20 and the high-voltage electrode block 40.

  The high-voltage electrode block 40 is cleaned by immersing it in high-temperature cleaning water after the electrostatic dust collector M has been used for a certain period. At this time, the resin constituting the high-voltage electrode block 40 has water absorption. Since it is resin, the high voltage electrode block 40 expands due to water absorption. Accordingly, when the high voltage electrode block 40 after cleaning is assembled to the collector frame 20, as shown in FIG. 10A, the dimension of the collector frame 20 is determined without considering the expansion allowance, and the case is “no escape”. If the expanded high voltage electrode block 40 interferes with the collector frame 20, the high voltage electrode block may be warped.

  On the other hand, a gap d allowing the expansion of the high-voltage electrode block 40 is secured between the collector frame 20 and the high-voltage electrode block 40 as in the above-described embodiment, and the convex portion 43 of the high-voltage electrode block 40 is provided. In the case of “with relief” in which the positioning recess 23 is provided with the expansion allowance S, as shown in FIGS. 9 (b) and 10 (b), the protrusion 43 moves outward as the high-voltage electrode block 40 expands. However, since it only moves within the range of the expansion allowance S of the recess 23 of the collector frame 20, the high-voltage electrode block 40 does not interfere with the collector frame 20, so that the warp of the high-voltage electrode block 40 is avoided.

  Thus, by positioning the small hole 73 of the power supply member 70 in the convex portion 43 provided on the rib 41, the high-voltage electrode block 40 and the power supply member 70 can be easily positioned and protruded from the small hole 73. By engaging the convex portion 43 of the high-voltage electrode block 40 with the concave portion 23 of the collector frame 20, the positioning of the high-voltage electrode block 40 with respect to the collector frame 20 can be easily performed. Therefore, the assembly of the power supply member 70 to the high-voltage electrode block 40 and the assembly of the high-voltage electrode block 40 to the collector frame 20 can be easily performed.

  Moreover, since the expansion allowance S due to moisture absorption during cleaning of the high-voltage electrode block 40 is provided in the recess 23 of the collector frame 20, the expansion of the high-voltage electrode block 40 can be absorbed, and the high-voltage electrode block 40 due to expansion can be absorbed. Warpage can be prevented and damage to each part can be prevented.

It is a disassembled perspective view of the electrostatic dust collector of embodiment of this invention. It is an external appearance perspective view of the assembly of the principal part of the dust collection part of the electrostatic dust collector. The structure of the electric power feeding member for supplying electric power to the dust collector high voltage electrode of the electrostatic dust collector is shown, (a) is a perspective view of the electric power feeding member viewed from one direction, and (b) is opposite to (a). It is the perspective view seen from the direction. It is a perspective view which shows the structure of the high voltage | pressure electrode block which comprises the dust collection part high voltage electrode of the electrostatic dust collector. It is a figure which shows the relationship between the rib of the said high voltage | pressure electrode block, and a power feeding member, (a) is a figure which shows the state before fitting a power feeding member to a rib, (b) is a figure which shows the state after fitting. (A) And (b) is the perspective view which looked at the whole external appearance of the high voltage electrode block of the state which fitted the electric power feeding member on the rib from another angle, respectively. It is an expansion perspective view of the VII part of Fig.6 (a). It is a principal part block diagram of the dust collecting part of the electrostatic dust collector, and is a schematic front view showing a state where a high voltage electrode block is assembled to the collector frame. FIGS. 9A and 9B are enlarged views of a configuration of a part IX in FIG. 8, in which FIG. 9A is a perspective view showing a state before expansion of the high-voltage electrode block, and FIG. 9B is a perspective view showing a state after expansion. FIG. 4 is a side sectional view schematically showing the relationship between the collector frame and the high-voltage electrode block, where (a) shows a state when the collector frame and the high-voltage electrode block are in a flared state, and (b) shows a state during expansion when there is no flank. FIG. It is a perspective view which shows the relationship between the conventional high voltage electrode block and an electric power feeding member.

Explanation of symbols

M Electrostatic dust collector A Charging unit (ionizer)
B Dust collector (collector)
S Expansion allowance 3 Low voltage electrode 4 High voltage electrode 20 Collector frame 23 Recess 40 High voltage electrode block 41 Rib 41a End face 41b, 41c Side face 43 Convex part 70 Power supply member 71a End wall 71b, 71c Side wall 72 Energizing part (spring part)
73 Small hole 74 Feeding part

Claims (4)

A plurality of high-voltage electrodes arranged so as to cross the air passage, and a rib portion that connects the end portions of these high-voltage electrodes via a connecting portion, are provided with a high-voltage electrode block that is integrally formed of a semi-insulating resin. ,
A power feeding member made of a conductive material is an electrostatic dust collector disposed on the outer periphery of the rib portion excluding the connecting portion,
The power feeding part is disposed at a part of the power feeding member facing one of two opposing side surfaces of the outer periphery of the rib part, and the metal is disposed at the part of the power feeding member facing the other of the two side surfaces facing the outer periphery of the rib part. Form an urging section using the elasticity of the material,
An electrostatic dust collector, wherein the feeding portion is pressed against the outer periphery of the rib portion by the urging force of the urging portion. The electrostatic dust collector according to claim 1,
The electrostatic precipitator according to claim 1, wherein the urging portion is constituted by a section that is bent toward the power feeding portion. The electrostatic dust collector according to claim 1 or 2,
The electrostatic dust collector, wherein the urging portion is provided at least in the vicinity of both ends in the longitudinal direction of the power supply member. The electrostatic dust collector according to any one of claims 1 to 3,
While comprising a frame in which the high-voltage electrode block is accommodated,
A convex portion between the two opposite side surfaces of the outer periphery of the rib portion;
In a state where the power feeding member is assembled to the rib portion, a small hole is formed in a portion facing the convex portion of the power feeding member,
The high-voltage electrode block in a state where the power supply member is assembled to the rib portion, and a concave portion in which the convex portion protruding from the small hole is accommodated in the frame in a state where the high-voltage electrode block is assembled to the frame. Prepared,
The electrostatic dust collector, wherein the concave portion is set to a size that allows for an expansion allowance when the high-voltage electrode block expands.

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