JP2547248B2 - Electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a collector having an anode plate and a cathode dust collector plate coated with an insulating synthetic resin in an air flow path communicating between an inlet and an outlet. The present invention relates to an electric dust collector having a dust section.

(Prior Art) Conventionally, an electric dust collector having a dust collecting portion having an anode plate and a dust collecting plate electrode is disclosed in Japanese Utility Model Publication No. 47-1514 and Japanese Utility Model Publication No. 62-34598.
No. 6 and Japanese Utility Model Publication No. 62-24950, a structure in which a projection is provided on a sheet, a structure in which a dust collecting electrode plate is formed in a corrugated or other irregular shape, and a flat anode plate is alternately laminated and joined. The same publication discloses a structure in which a metal wire or a thin plate is coated with an insulating synthetic resin to form an anode plate, and this is laminated with a dust collecting electrode plate.

Further, the present applicant has previously proposed a dust collecting part having a coil winding structure in which an anode plate in which the periphery of a thin metal plate is molded with an insulating synthetic resin and a dust collecting electrode plate are laminated.

(Problems to be solved by the invention) However, the dust collecting part composed of the anode plate and the dust collecting electrode plate as described above is usually attached to the surface of the anode plate in the dust collecting electrode plate from the viewpoint of uniformly maintaining the distance between the both electrode plates. There is a corrugated shape that comes into contact with other parts, and a different shape part that also serves as a spacer is provided.If the dust on the surface of the anode plate becomes dirty when the humidity is high, the surface resistance of the anode plate decreases and the dust collecting electrode plate Negative charges flow from the contact part through the dirt and moisture, resulting in a decrease in the potential of the anode plate, and as a result, the potential difference between the dust collecting electrode plate and the surface of the anode plate is reduced, leading to a decrease in dust collection efficiency. . This phenomenon is related to the distance between the contact portions of the dust collecting electrode plate and the anode plate which are adjacent to each other as shown in FIGS. 11 and 12, and as shown in FIG. The longer distance (11) between the contact parts of the plate is shorter than that in the case of Fig. 11 which is shorter (10) than the surface potential at low humidity (a) and high humidity (b). ) Section (c) where both maintain a stable anode surface potential
Is long and is considered to be advantageous in terms of performance.

Therefore, generally speaking, it is preferable that the contact portion between the dust collecting electrode plate and the anode surface is small, but in each of the conventional structures described above, even if the contact portion is reduced, there is a limit and it is hardly considered.

The present invention is based on the viewpoint as described above, paying attention to the volume resistivity of the insulating synthetic resin on the surface of the anode plate, paying attention to the parallel plate type as a structure resistant to high humidity and dirt, and adding various improvements thereto. Therefore, it is intended to maintain the dust collecting performance stably for a long period of time regardless of high humidity and dirt.

(Means for Solving the Problem) That is, the feature of the present invention which meets the above-mentioned object is that, firstly, an anode plate (8) whose periphery is covered with an insulating synthetic resin (P). In the electrostatic precipitator having a cathode dust collecting electrode plate (9) provided in parallel with the anode plate in the dust collecting part (A), the insulating synthetic resin (P) has a volume resistivity of 10 ¹¹ to 10 10. It is said that it was set to ¹³ Ω · m (10 ¹³ to 10 ¹⁵ Ω · cm). Here, the volume resistivity is a value measured according to JIS K6911.

The invention according to claim 2 is the anode plate (8) according to the above characteristics.
A thin metal plate (M) is used as the internal electrode of the above, which is a concrete example.

The invention according to claim 3 relates to a basic structure of a dust collecting part in the electrostatic precipitator, comprising an anode plate formed by coating a metal thin plate with an insulating synthetic resin, and a cathode provided in parallel with the anode plate. In an electrostatic precipitator having a dust collecting electrode plate in the dust collecting part, the dust collecting part has a chamber surrounded by an insulating material through partition walls at both ends, and a groove is formed on a wall surface facing the chamber. At least one end is inserted into the groove of the provided dust collecting element frame so that a plurality of the anode plates and the dust collecting electrode plates are alternately arranged, and the exposed metal thin plate and dust collecting at the end of the anode plate inserted into each groove. This is to have a configuration in which the end portions of the electrode plate are connected to the respective contact elements arranged in the respective chambers at both ends of the element frame.

The insulating synthetic resin of the anode plate and the insulating material forming the dust collecting element frame preferably have different degrees of insulation, and the former volume resistivity is 10 ¹¹ to 10 ¹³ Ω.
・ The range of m, the latter is practically 10 ¹⁵ Ω ・ m or more.

Further, the above dust collecting portion structure is a basic structure, and various modifications are further implemented regarding the arrangement configuration of the both ends of the anode plate and the dust collecting electrode plate itself.

Claims 5 and 6 are such modifications, and
The structure of (1) is to cover (including potting) the connecting portion with the contact in each chamber on both sides of the dust collecting element frame (including potting), and to measure the volume resistivity of the covering insulating material by the insulating composition of the anode plate. It is higher than the resin, and is 10 ¹⁵ Ω · m or more as in the case of the dust collecting element frame. According to claim 6, a dust collecting electrode plate is provided with a dowel protruding therefrom and the strength is maintained in the longitudinal direction. Characterized by the provision of extending ribs.

(Function) The volume resistivity of the insulating synthetic resin coated as described above is set to 10
^In the range of ¹¹ to 10 ¹³ Ω · m, the negative charges that have flowed into the surface of the anode plate are likely to flow into the anode plate through the insulating synthetic resin. Further, at least one end is inserted into a groove provided in the facing partition wall of a chamber formed through partition walls at both ends, and a plurality of anode plates and cathode dust collecting electrode plates are alternately arranged to the anode plate. The exposed metal plate at the end and the end of the dust collecting electrode plate are connected to the contacts arranged in the respective chambers, whereby the anode plate and the dust collecting electrode plate are stably held by the groove of the partition wall. It is possible to eliminate or reduce the contact area of both electrodes by a spacer etc., and the chance of negative charges flowing from the contact area of the dust collecting electrode plate to the surface of the anode plate is reduced, and the dust collecting performance is stable for a long period of time. Maintained.

Particularly, when the volume resistivity is selected according to claim 4, in the anode plate, negative charges are generated through the insulating layer of the metal thin plate (M).
It is difficult to accumulate due to flowing,
Due to the synergistic effect, the influence below the surface potential is reduced, and it is more effective for long-term maintenance of dust collection performance.

Further, by providing each structure to the anode plate or the dust collecting electrode plate as claimed in claim 5 and further improving the high insulation and sealing property in the chamber at both ends of the element frame, the height between the anode plate and the dust collecting electrode plate is increased. Eliminating the adverse effects of voltage leaks and water intrusion, enhancing the long-term maintenance of the above dust collection performance,
Makes handling such as maintenance easy.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 to 3 show an example of the structure of a dust collecting portion which is a main part of the electrostatic precipitator of the present invention. In the drawings, (1) is a dust collecting element frame made of an insulating material, which is opposed to both inner ends thereof. Partition walls (2), (3) are provided, and contactors (6), which contact the power supply terminals (not shown) on both sides of the partition walls, respectively.
Chambers (4) and (5) for storing (7) are formed,
Grooves (1) into which the anode plate (8) and the dust collecting electrode plate (9) which is the cathode are respectively inserted in the partition walls (2) and (3) facing each other.
0) and (11) are provided so that the anode plate (8) is in the groove (10),
Further, the dust collecting electrode plates (9) are inserted into the grooves (11) at one end thereof, and the other end side thereof is pressed against the partition walls (3) and (2) to be alternately laminated.

In this case, the applicant previously proposed the anode plate (8),
As shown in FIG. 4, the flat metal thin plate (M) is formed by mold-coating it with an insulating synthetic resin (P) such as vinyl chloride resin, and the partition wall (3) of the dust collecting element frame (1) is formed. ) Is pushed by the resin, and the end of the side inserted into the groove (10) is exposed by the metal thin plate (M) which is an internal electrode, and the inner contact ( 6) is connected.

Moreover, in the above structure, the insulating synthetic resin (P) that covers the periphery of the metal thin plate (M) is special because the anode always applies a small current to prevent negative charges from accumulating on the surface. High insulation is not required, usually 10 ¹¹ to 10 ¹³ Ω ・
A material having a volume resistivity of about m (10 ¹³ to 10 ¹⁵ Ω · cm) is used.

If 10 ¹¹ Ω · m or less, durability becomes a problem,
The size and efficiency are also affected, and conversely, if it exceeds 10 ¹³ Ω · m, the potential of the anode surface decreases, which is not preferable.

However, it is desirable that the insulating material constituting the dust collecting element frame (1) has a high insulating property, and as the insulating material used for this, a material having a volume resistivity of 10 ¹⁵ Ω · m or more is usually used.

On the other hand, the dust collecting electrode plate (9), which is the cathode, is made of a flat metal thin plate as is known, and is appropriately spaced (this spacing is obviously longer than the conventional corrugated pitch).
It has a bent spacer (9a), and at the opposite end pressed against the partition wall (2), the groove (1
Contact (7) inserted in chamber (5) by inserting into contact (1)
It is connected to the.

In the illustrated example, the dust collecting electrode plate (9) is provided with several spacers (9a) near both ends and in the middle, but the spacer (9a) is not always necessary.
A simple parallel plate may be used for the anode plate (8). However, it is preferable to dispose the spacer (9a) from the viewpoint of maintaining the distance between the anode plate (8) and the dust collecting electrode plate (9), and as far as possible, the distance between the adjacent contact portions is reduced. It is desirable to arrange with a long pitch. Of course, the spacer (9a) may be integrally formed by bending the dust collecting electrode plate (9), but it does not prevent the spacer from being inserted separately.

Further, the formation of the spacers formed on the dust collecting electrode plate (9) is not limited to the formation by bending the dust collecting electrode plate (9) itself as shown in FIGS. 1 and 3, and as shown in FIG. Such a protrusion (9b) may be used. In this case, it is preferable to provide the dowel protrusions (9b) so as to form a group of concave and convex protrusions on average in the vertical direction, but of course, similar to the above, the distance between the adjacent dowel protrusion groups, It is preferable to make the distance between the contact parts relatively long, and normally, one place on each of the left and right sides,
There are also two places in the middle.

Further, the ribs (9c) are not limited to the dowel projections (9b) as described above, but may be used in combination with the dowel projections (9b) as shown in FIG.
Alternatively, it can be appropriately provided between the bent spacers (9a) as shown in FIG. 1, and it is effective to secure the parallelism with the anode plate (8) by improving the strength.

Although the spacer is formed by bending or providing a dowel on the dust collecting electrode plate (9) side,
The spacer may be provided not on the dust collecting electrode plate side but on the anode plate (8) side, or both may be used in combination.

FIG. 7 shows the case where the dowel (8a) as such a spacer is taken out from the anode plate (8).

Such a dowel (8a) can be easily prepared by modifying the mold when molding the insulating synthetic resin.

Further, both the anode plate (8) and the dust collecting electrode plate (9) of the dust collecting portion have one end inserted into the groove of the partition wall and the other end pressed against the inner surface of the facing partition wall. Alternatively, both ends may be provided with grooves in the partition wall so that they can be inserted or held, and FIG. 8 shows an example thereof.

That is, in the figure, one end of the anode plate (8) is inserted into the groove (10) provided in the partition wall (2) of the chamber (4), and the metal thin plate (M) of the internal electrode is exposed at the end. Is connected to the contactor (6), the other end is inserted into the groove (11) provided in the opposing partition wall (3), and the tip thereof is pressed against the contactor (7). (This need only be supported as shown in FIG. 9), while the dust collecting electrode plate (9) has a groove (1) provided in the partition wall (3) at one end thereof.
The end portion is inserted into 1) and connected to the contactor (7), and the other end is inserted into and supported by the groove (10) provided in the opposing partition wall (2).

In this case, the number of grooves provided in the partition walls (2) and (3) is twice the number as in the case of FIG.
There is no problem in practical use. However, in this case, at least the dust collecting electrode plate (9) is provided with positioning dowels or ribs (9d) as shown in FIG. 8 in order to prevent its free movement and ensure the positioning. Is desirable.

Further, in each of the above-mentioned configurations, the chambers (4) and (5) provided at both ends of the element frame (1) have contact terminals (6) and an exposed end portion of the anode plate and an end portion of the dust collecting electrode plate, respectively, in each chamber. (7) are in contact with each other, but in order to prevent high-pressure leak and water intrusion, and in the structure shown in FIGS. 8 and 9, the dust collecting electrode plate and the exposed metal thin plate of the anode. In order to prevent short circuits between the chambers (4) and (5), the chambers (4) and (5) are fixed to the lid (12) as shown in FIG. 2 or by potting or other suitable means as shown in FIG. Fill with (13),
Alternatively, it is preferable that at least the contact portion with each contactor is covered with an insulating material, and in the case of FIGS. 8 and 9, an insulating material is interposed between both electrode plates. In particular, when the insulating material (13) is filled, water is prevented from entering the both end chambers (4) and (5) and the robustness against shocks and vibrations is increased to prevent insulation deterioration, and It has the effect of contributing to the prevention of electrolytic corrosion and causing no hindrance during washing with water.

As the insulating material in this case, a thermosetting resin that can eliminate the causes of moisture and corrosion, such as an acrylic resin, is usually used. This resin has a higher insulating property than the insulating synthetic resin that is the exterior of the anode plate (8), and has the same volume resistivity of 10 ¹⁵ as the insulating material forming the dust collecting element frame (1).
Ω · m or more.

In addition to the above, it goes without saying that, in the present invention, appropriate modifications can be made without departing from the scope of the invention.

Thus, as described above, the parallel plate type structure of the anode plate and the dust collecting electrode plate is formed so that the contact portion between the both electrode plates is small,
It is possible to obtain a dust collector that is highly resistant to high humidity and dirt, and as is known, it is removably assembled to the dust collector main body by slide operation, and the power supply terminal provided on the dust collector main body at the specified insertion position The function of the electrostatic precipitator is activated by bringing the anode contactor (6) and the dust collecting electrode contactor (7) provided in the element frame (1) into contact with each other.

(Effects of the Invention) The present invention provides an electrostatic precipitator having an anode plate whose periphery is coated with an insulating synthetic resin as described above and a cathode dust collecting electrode plate provided in parallel with the anode plate in the dust collecting portion. By setting the volume resistivity of the insulating synthetic resin to be in the range of 10 ¹¹ to 10 ¹³ Ω · m, negative charges in the anode plate are successively and slightly flowed through the insulating layer into the anode plate, thereby accumulating. It has a remarkable effect of reducing the influence of surface potential decrease and maintaining the dust collecting performance for a long time. Further, it is general and suitable to use a thin metal plate as an internal electrode covered with an insulating synthetic resin.

In the present invention, as the structure of the dust collecting portion using the above-mentioned anode, the anode plate and the dust collecting electrode plate are parallel plate type and the groove of the partition wall is formed in the element frame having chambers at both ends. Based on the structure in which they are inserted and stacked alternately, the anode plate and the dust collecting electrode plate can be held by the grooves of the partition walls provided at both ends, and the dust collecting plates with different shapes such as the conventional corrugated shape can be held. Compared to the electrode plate, the contact part between the anode plate and the dust collecting electrode plate can be reduced, so even if the surface of the anode plate becomes dirty at high humidity, the negative electrode from the contact part of the dust collecting electrode plate There is little opportunity for electric charges to flow in, so that the potential of the surface of the anode plate is not lowered, and as a result, the reduction of the potential difference between the anode plate and the dust collecting electrode plate, which has been conventionally caused, is prevented. Maintain the dust collection performance and secure stable dust collection efficiency for a long period of time. It has the advantage of leaving.

In addition, the insulating synthetic resin of the anode plate is made to have a different volume resistivity with respect to the insulating material for forming the dust collecting element frame, so that the surface of the anode plate is combined with the relatively low volume resistivity. It is possible to synergistically prevent the accumulation of negative charges on the surface and further reduce the influence of the decrease in the surface potential.

Further, the insulating material coating according to claim 5 has a large volume resistivity and a high insulating property, and a resin having a resistance of 10 ¹⁵ Ω · m or more is usually easily available, and furthermore, a groove is formed from the exposed portion of the inner thin metal plate at the end of the anode plate. The dowel, rib, etc., formed on the electrode plate according to claim 6, has an effect of preventing high-pressure leakage directly to the dust collecting plate when the dust collecting electrode plate end is inserted into the groove. It is possible to improve the practicality of the structure of the dust collecting portion by improving the strength.

[Brief description of drawings]

FIG. 1 is a view of the structure of a dust collecting part which is a main part of the electrostatic precipitator of the present invention.
FIG. 2 is a schematic view showing an example, FIG. 2 is a front view of FIG. 1 with an intermediate part omitted, and FIG. 3 is a perspective view of a part thereof. FIGS. 4 (a) and 4 (b) are a front view and a right side view of an intermediate plate of the anode plate used for the dust collecting portion, and FIGS. 5 (a) and 5 (b).
Is a partial perspective view and a front view showing another configuration example of the dust collecting electrode plate used in the above dust collecting portion, and FIGS. 6 (a) and 6 (b) are partial plan views showing still another configuration example of the dust collecting electrode plate. FIGS. 7A and 7B are front and side views showing a modified embodiment of the anode plate, and FIGS. 8 and 9 show both ends of the anode plate and the dust collecting electrode plate. Schematic and partial views showing each example when supported,
Fig. 10 shows the part filled with the insulating material inside the element frame. Fig. 11 (a), (b) and Fig. 12 (a), (b) show low and high humidity due to the difference in the distance between the contact parts. FIGS. 11 (a) and 11 (b) show the case where the distance is small, and FIGS. 12 (a) and 12 (b) show the case where the distance is long. (A) ... Dust collector, (1) ... Element frame, (2), (3) ... Partition wall, (4), (5) ... Each chamber at both ends in the frame, (6), ( 7) …… Contact, (8) …… Anode plate, (8a) …… Anode plate dowel, (9) …… Dust collecting electrode plate, (9a) …… Spacer (bent), (9b)… … Dowels, (9c) …… ribs, (9d) …… positioning dowels or ribs, (10), (11) …… grooves on partition walls, (12) …… lid, (13) …… insulating material.

Claims (6)

(57) [Claims] 1. An anode plate (8) whose periphery is covered with an insulating synthetic resin (P) and a cathode dust collecting electrode plate (9) provided in parallel with the anode plate (8). The electrostatic precipitator in the dust part (A), wherein the volume resistivity of the insulating synthetic resin (P) is 10 ¹¹ to 10 ¹³ Ω · m. 2. The electrostatic precipitator according to claim 1, wherein the anode plate (8) is formed by covering the periphery of the thin metal plate (M) with an insulating synthetic resin (P). 3. A dust collecting part (A) having partition walls (2) at both ends,
It has chambers (4) and (5) surrounded by an insulating material through (3), and the wall surfaces (2) and (3) facing each other of the chambers (4) and (5).
At least one end is inserted into the grooves (10) and (11) of the dust collection element frame (1) provided with grooves (10) and (11) in the anode plate (8) and the dust collection electrode plate (9). A plurality of them are alternately arranged, and the ends of the exposed metal thin plate (M) and the dust collecting electrode plate (9) at the ends of the anode plate (8) inserted into the grooves (10) and (11) are connected to the element frame. (1) Each room at both ends (4),
The electrostatic precipitator according to claim 2, wherein the electrostatic precipitator is configured by connecting to the contactors (6) and (7) disposed in (5), respectively. 4. The electrostatic precipitator according to claim 3, wherein the insulating material forming the dust collecting element frame (1) has a volume resistivity of 10 ¹⁵ Ω · m or more. 5. A contact (6), (7) connecting portion in each chamber (4), (5) at both ends of the dust collecting element frame (1) is covered with an insulating material (13), and the connecting portion is covered. 4. The electrostatic precipitator according to claim 3, wherein the insulating material (13) to be coated has a volume resistivity of 10 ¹⁵ Ω · m or more. 6. A dust collecting electrode plate (9) having a dowel (9b) protruding therefrom and a rib (9c) extending in a longitudinal direction thereof. Electric dust collector.