JPH0817961B2 - Electrode dust collector electrode - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold type dust collecting part electrode of an electrostatic precipitator,
More specifically, the present invention relates to an electrode structure capable of waterproofing, dustproofing, and highly electrically insulating the end portion of an electrode of a dust collecting portion.

(Prior art) An anode plate covered with a long strip-shaped metal plate of an electrically insulating synthetic resin and a cathode plate of a long strip-shaped metal plate having a large number of bends or protrusions in a wavy shape are spirally arranged. An electric dust collector having a dust collecting portion formed in a narrow passage through which air flows between corrugations or between protrusions by winding a coil around the coil is known from Japanese Utility Model Publication No. 47-1514.

With such a shape, the end portion on the side opposite to the contact side for extracting the electric potential, usually on the core side of the coil winding,
In particular, it is necessary to prevent the metal edge of the anode plate from being exposed.

By the way, the metal end is exposed at the anode end because this anode plate is generally continuously molded as a long molded product by extrusion molding or the like, so when the required length is taken out as a product, the metal end is cut into the cut end. It is inevitable to expose it.

The reason for preventing the metal from being exposed in this portion is that there is a potential difference of several thousand volts between the anode and the cathode plate for collecting dust, and a creeping discharge from the exposed metal part to a nearby cathode plate,
Alternatively, discharge of corona, fireworks, or the like causes a current to flow, resulting in a short-circuited state, making it impossible to secure the potential difference between the anode and the dust collecting cathode.

In particular, if the dust collecting part can be washed, even if the space distance is sufficient, the part wet with water becomes conductive and easily short-circuits after washing with water.

Therefore, the end portion of the anode is required to be waterproof and electrically insulating.

(Problems to be Solved by the Invention) As described above, various means have been conventionally taken for the insulation treatment of the end portion, and one example thereof is shown in the above-mentioned known example. Can be carried out by filling the anode having a circular cross section such as an insulation-coated wire with the same thickness as the medicine head of a match, but an insulation suitable for a flat anode having a rectangular cross section. The treatment is still not sufficient.

It should be noted that what is considered as the insulation treatment is that fitting of an insulation cap and molding treatment are inferred from the conventional general-purpose technique. First, in the former case, when it is applied to a flat shape. The cap obtained by dip molding has problems that the shoulder (5) 'becomes thin as shown in FIG. 2 and that the adhesiveness of the surroundings is poor.

On the other hand, in the latter case, even if the end of the anode plate is directly immersed (dipped) in the molding material to fill the end, the shoulder meat (corner thickness) is thin, which is the same as the former. Is.

As described above, it is unavoidable that the shoulder wall is thinned by any of the processing means, and in the case of a structure in which a metal having a ground potential is present so as to contact the end of the anode subjected to the insulation treatment, the anode plate The insulating material at the portion where the electric field is concentrated becomes thin at the end portion of, and thus dielectric breakdown easily occurs.

Although it is sufficient to thicken the thin portion of the shoulder, this is not preferable because it relatively thickens the entire cap or the molding coating, resulting in a large overall thickness of the product.

In addition, the part of this end that has been insulated is a part where foreign matter such as dust is likely to adhere during use, and even if the tar component of cigarettes sticks to the swollen part such as the cap, it can be completely washed with water. The fact that it cannot be removed is considered to be a practical drawback, and this is the reason why its improvement is strongly desired.

To cope with such problems, it is excellent in terms of waterproofing and electrical insulation, and by using a protective cap and a core material that can be mass-produced by a simple method, it is mechanically secure and robust. The present invention has been made in order to provide an electrode end treatment which can be made compact with a certain structure, and ensures long-term stability of the electric dust collection performance by ensuring waterproofness and electric insulation. The purpose is to let.

(Means for Solving the Problems) However, in order to achieve the intended purpose of the present invention, as will be apparent from the embodiments shown in the accompanying drawings, the invention of claim 1 is a long band-shaped metal made of synthetic resin. The anode plate (1) coated (4) with the plate (3) and the cathode plate (2), which is a long strip-shaped metal plate having a number of bent or wavy corrugations, are coiled along with each other to form a waveform. In an electrostatic precipitator having a dust collecting part formed in a narrow passage through which air flows between spaces or ridges, an electrically insulating soft material is provided at an end of the anode plate (1) opposite to a power supply connecting end. A flat protective cap (5) made of synthetic resin is fitted, and the protective cap (5) has at least one rib (8) projecting from the inner side of the inner surface and abutting against the end face of the anode plate (1). Have,
The feature of the configuration of the dust collecting part electrode is that the end of the inserted anode plate (1) is located at an appropriate distance from the shoulder of the protective cap (5).

Next, the second aspect of the present invention is that the positive electrode plate (1) and the protective cap (5) in the fitted state are hermetically sealed with a sealing material at least at the outer end of the fitting portion. Is added to.

On the other hand, the invention of claim 3 relates to an anode plate (1) having a long strip-shaped metal plate (3) coated with a synthetic resin (4) and a long strip-shaped metal plate cathode plate having a large number of bends or protrusions in a wavy shape. (2) An electric precipitator having a dust collecting portion formed in a narrow passage through which air flows between the corrugations or between the protrusions by winding the coil along with the power supply connection of the anode plate (1). A flat protective cap (5) made of electrically insulating soft synthetic resin is fitted to the end of the core opposite to the end, while the protective cap (5) and an anode plate connected to the protective cap (5) The bottom wall (9) and the bottom wall (9) and the bottom wall (9) and the bottom wall (9) so that they can be closely opposed to all the surfaces other than the one side edge with respect to the end of the cathode plate (2) and the end of the cathode plate (2). (4) Elongated gutter-shaped flat core made of electrically insulating synthetic resin having four side walls (10) standing upright from (9) ( ) Are engaged with each other, and the protective cap (5) has at least one rib (8) projecting in the inner rear portion thereof so as to abut against the end face of the anode plate (1), and the inserted anode plate (1). 2) is located at a proper distance from the shoulder of the protective cap (5).

(Operation) Since the protective cap (5) has the ribs (8), the thinnest shoulder portion and the end corner portion of the anode metal plate are separated from each other, and as a result, dielectric breakdown is likely to occur at the edge portion. Is prevented and a long life is achieved. Further, the fitting of the protective cap (5) suppresses the intrusion of water into the charging part and improves the waterproof performance, but the sealing by the sealing material makes the waterproof property higher.

On the other hand, by engaging the core material (6), it is possible to stably hold the winding core and easily provide an organized dust collecting section in a coil winding state.

Further, by using the flat core material (6),
In addition to stabilizing the shape of the flat coil winding, the pole interval can be held constant, and a compact dust collecting section can be easily obtained.

Furthermore, since the core material (6) has a structure in which the other end of the electrode plate is covered with the exception of one side edge, the core material (6) can function as a shielding wall that blocks the wind on the windward side of the air flow. It is possible to reliably prevent the infiltration of dust and tar components,
The shielding wall is interposed between it and the grounding member such as a wire mesh, which not only keeps the insulation performance stable but also does not impair the dust collection performance, is easy to clean, and protects the edges. It will be

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

FIG. 1 schematically shows the structure of the main part of a dust collecting part according to an example of the present invention. The dust collecting part is composed of a resin mold type anode plate (1) and a metal plate cathode plate (2). The anode plate (1) is formed by covering (4) a long strip-shaped metal plate (3) with a synthetic resin having a high dielectric constant and a high dielectric strength, such as vinyl chloride resin.

The cathode plate (2) is a long strip-shaped metal plate that is bent in a wavy shape or is provided with a large number of protrusions formed by bending at equal pitches. By forming a coil winding along the line, for example, a flat coil winding, a narrow passage through which air flows can be formed between the corrugations or between the ridges, but a high DC voltage of, for example, 2000 V is applied to the anode plate (1). The cathode plate (2) is grounded so that a potential difference of 2000 V is provided between the electrode plates (1) and (2), and thus, fine particles such as dust charged in the ionization section (not shown) are collected in the dust collection section. Repels the anode plate (1) and the cathode plate (2)
It will be electrodeposited on and electrostatically collected.

In the dust collecting portion, the end opposite to the power supply connecting end of the anode plate (1), which is usually the end on the core side, is a flat protection made of electrically insulating soft synthetic resin. A cap (5) is fitted to provide insulation protection for the end.

The protective cap (5) is formed by dip-molding, which is a molding method in which a paste-like resin is fixed to the outer surface of a male mold and then released from the mold. Produce things.

In this case, it is unavoidable that the shoulder flesh becomes thin, and the rib (8) projecting toward the opening side at the innermost deepest part is integrally formed at the same time during dip molding because of this relationship.

In the example shown in FIG. 4, the rib (8) is located approximately at the bottom of the deepest part.
It is sufficient if the protrusion is about 5 mm and the protrusion is thin and low. When the width of the anode plate (1) is relatively small (about 10 to 20 mm), one rib (8) in the center is sufficient. On the other hand, when the anode plate (1) has a relatively large width of 40 mm or more, it is sufficient to project two or three ribs (8) at positions that divide the width into substantially equal parts.

When the protective cap (5) integrally formed with the rib (8) is fitted to the end portion of the anode plate (1) as shown in the figure, the rib (8) is attached to the end of the anode plate (1). As a result of hitting the exposed metal portion of the edge, the thinnest shoulder and the end of the anode plate (1) are separated by about 5 mm, and thus the end of the anode plate (1) is provided with a predetermined protection cap (5). Electrically and mechanically protected by the thick side.

In the illustrated example, a cemedine (commercial product) is used as a sealing material for the gap formed between the outer periphery of the end of the positive electrode plate (1) and the inner periphery of the protective cap (5) in the fitted state. The adhesive (7) such as (name) is filled in a required amount to strengthen the adhesion between the two members, and is hermetically sealed so that gas and liquid do not enter.

On the other hand, although FIGS. 6 to 8 show another embodiment of the protective cap (5), the rib (8) may be convexly formed inwardly from the side surface (see FIG. 6). ,in this case
Since it is sufficient that the protrusion is about 1 mm, the wall thickness is not thin and the insulation can be secured.

Next, FIGS. 7 and 8 show examples of the sealing means. If a sealing material such as an adhesive material (7) is applied to the outer end portion of the cap fitting portion as shown in FIG. 7, it is hermetically sealed. In this case, the adhesive (7) is preferable from the standpoint of workability because the adhesive (7) is fixed in a few seconds when an ultraviolet curable resin is used.

Further, as for the sealing material, it is also possible to use a means for hermetically sealing a required portion by means of a hermetically sealed heat-shrinkable tube (18) having a hot melt (19) attached to its inner surface as shown in FIG. It is included in the scope of the invention.

Then, the anode plate (1) having the protective cap (5)
With the cathode plate (2) and the cathode plate (2) placed side by side, the dust collecting electrode is formed by winding it up into a flat coil winding so that it fits in a rectangular outer frame as closely as possible without gaps. In order to surely and neatly finish the coil winding, and to improve the dustproof property and the insulating property of the winding core member, the illustrated example shows an elongated core material (6) made of an electrically insulating synthetic resin such as polypropylene resin. ) Is installed.

The core material (6) is 10 mm × as shown in FIGS. 9 and 10.
An elongated box-shaped electrode plate that has four side walls (10) raised by about 10 mm on the entire circumference of a strip-shaped bottom wall (9) of about 50 mm and has an opposing surface of the bottom wall (9) as an opening. Part 2 of 11
It is a long and slender integrally machined member of about 10 mm × 140 mm as a whole in which individual pieces are connected by a connecting portion (13) having a length of about 40 mm, and the connecting portion (13) has two electrode plate receiving portions (11) opposite walls. Has a partition wall (12) in which the corners on the opposite side to each other are eclipsed and connected to each other, and each electrode plate receiving portion (11) further has a pole at the location of the facing wall portion. Only one cut groove (14) for inserting the plate is provided.

Reference numeral (15) indicates a mounting hole for fixing the dust collecting frame (not shown) at a predetermined position.

For the core material (6) having the above-mentioned structure, one end of the anode plate (1), which is formed by fitting the protective cap (5) into the one electrode plate receiving portion (11), The end portion of the corrugated cathode plate (2) is inserted into the electrode plate receiving portion (11).

In this state, by winding the bipolar plates (1) and (2) along the core material (6), the dust collecting electrode is formed into a flat coil winding around the core material (6). It

In the present invention, if it is possible to obtain the core material (6) having an elongated shape with a predetermined length, it is necessary to closely face all the surfaces other than one side edge of the electrode plate from the outside. The number of elongated gutter-shaped electrode plate receiving portions (11) to be obtained may be one, and in that case, it is used for accommodating the end portions of the anode plate (1) or the cathode plate (2), and When attaching to the dust part frame, it is a requirement that the bottom wall (9) be attached to the windward side of the electrode plates (1) and (2) with respect to the air flow direction of the air flow path. is there.

As described above, the dust collecting part electrode formed by fitting the protection cap (5) and engaging the core material (6) and winding the flat coil is used for the anode plate (1) by the protection cap (5). ) The exposed metal portion of the end portion is insulated and protected, and in this case, since the thin shoulder portion is separated from the end edge of the anode plate (1), the thin wall portion is not adversely affected.

On the other hand, by engaging the core material (6), not only the electrical and mechanical protection of the ends of the bipolar plates (1) and (2) but also the function of a dustproof cover for preventing dust from adhering.

Further, it goes without saying that the core material (6) stably maintains the shape of the flat coil winding.

(Effects of the Invention) The present invention has the structure described in detail above, and when the protective cap (5) is fitted to the end of the anode plate (1),
Since the ribs (8) are provided, the thin shoulder portion is separated from the end portion of the anode plate (1), and the insulation deterioration that tends to occur at the end portion is reliably prevented without being adversely affected by the thin insulating layer. You can

Further, by increasing the degree of adhesion of the protective cap (5), the protective cap (5) also has excellent waterproofness and is extremely useful when applied to a water-washed type.

In particular, the second aspect of the present invention is to seal with a sealing material,
It is more waterproof and has greater mechanical strength.

Further, since the flat core material (6) is used in the third aspect, the mechanical protection of the end portion of the dust collecting electrode is ensured, and the core body of the flat coil winding is stabilized to stabilize the winding shape. It greatly contributes to.

Further, since the core material (6) has the bottom wall (9) and has the inside of the machine as a shielding wall, it is possible to completely prevent foreign matters such as dust from adhering to the electrode end portion, resulting in further improvement of electrical insulation. It has the advantage of long life.

[Brief description of drawings]

FIG. 1 is a rear view seen from the downstream side of an air flow according to an embodiment of the present invention, FIG. 2 is an enlarged view of an end portion of an anode plate, FIG. 3 is the same perspective view, and FIGS. The front view and the right side view of the protective cap according to the embodiment of the invention, FIGS. 6 to 8 are structural views of the protective cap according to the respective examples of the present invention, FIGS. 9 and 10.
Similarly, the figure is a front view and a right side view of the core material. (1) …… Anode plate, (2) …… Cathode plate, (3) …… Metal plate, (4) …… Coating, (5) …… Protective cap, (6) …… Core material, (7) …… Adhesive material, (8) …… rib, (9) …… bottom wall, (10) …… four-sided side wall.

Claims (3)

[Claims] 1. An anode plate (1) having a long band-shaped metal plate (3) coated with a synthetic resin (4) and a long band-shaped metal plate (2) bent or corrugated in a wavy shape. And a power source connecting end of the anode plate (1) in an electrostatic precipitator having a dust collecting portion formed in a narrow passage through which air flows between the corrugations or between the protrusions by winding the coil along A flat protective cap (5) made of electrically insulating soft synthetic resin is fitted to the opposite end, and the protective cap (5) is located inside the anode plate (1) in the inner part. A dust collecting part electrode of an electrostatic precipitator, characterized in that an end portion thereof is located at an appropriate distance from a shoulder portion of the protective cap (5). 2. The electrostatic precipitator according to claim 1, wherein the anode plate (1) and the protective cap (5) in the fitted state are hermetically sealed by a sealing material at least at the outer end of the fitting portion. Electrode of dust collecting part. 3. An anode plate (1) having a long strip-shaped metal plate (3) coated with a synthetic resin (4), and a long strip-shaped metal plate cathode plate (2) having a large number of curved or wavy protrusions. And a power source connecting end of the anode plate (1) in an electrostatic precipitator having a dust collecting portion formed in a narrow passage through which air flows between the corrugations or between the protrusions by winding the coil along A flat protective cap (5) made of an electrically insulating soft synthetic resin is fitted on the opposite end of the winding core, while the protective cap (5) and an anode plate (1) connected to the protective cap (5). The bottom wall (9) and the bottom wall (9) so that the other end of the cathode plate (2) and the end of the cathode plate (2) on the winding core side can be closely opposed from the outside. Elongated gutter-shaped flat core (6) made of electrically insulating synthetic resin with four side walls (10) standing upright from The protective cap (5) has at least one rib (8) projecting from the inner surface of the protective cap (5), which abuts against the end face of the anode plate (1). Is located at an appropriate distance from the shoulder portion of the protective cap (5).