JPH0779973B2 - Electric dust collector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrostatic precipitator using an electrode in which a metal thin plate is surrounded by an insulative synthetic resin, and more particularly to an electric joining to the molded electrode. The present invention relates to the above electrostatic precipitator having an improved means.

(Prior art) As an electrostatic type electrostatic precipitator that electrostatically collects dust floating in the air and collects it by electrostatic electrodeposition, it is recently molded by extrusion molding around a thin metal plate sealed with resin. The applicants have proposed an electrostatic precipitator using such an electrode as the anode of the dust collecting part. (Japanese Patent Application No. 63-160370, etc.) In this electrostatic precipitator, as shown in FIG. 7, the anode (1) and the dust collecting ground electrode (2) are alternately stacked so that an air-permeable gap is interposed. It has a dust collecting part (A) structure in which the formed laminated body is housed in a frame body (3) and has an insulating property around a long metal thin plate (electrode plate) (M) as shown in FIG. An anode (1) molded with a synthetic resin (P) and a corrugated metal thin plate having a continuous wavy shape in the longitudinal direction, and a long dust collecting grounding electrode (2) usually made of a metal foil, are used for air circulation therebetween. After superposing them with a gap, they are wound into a flat elliptical coil shape to form the laminate, and the both poles (1) and (2) are separated from each other at the winding end end, as shown in FIG. Connect the anode (1) to the anode contactor (4) and the dust collecting ground electrode (2) to the ground electrode contactor (5) electrically and mechanically, respectively. It is fit.

Further, a self-discharge resistor (6) having a high resistance is provided so as to extend over the anode contactor (4) and the ground electrode contactor (5), and both the contactors (4) and (5) collect dust. When the part (A) is mounted at a predetermined mounting position in the dust collector main body (not shown), the high-voltage power supply terminal (7) and the installed power supply terminal (8) provided on the main body side come into elastic contact with each other. It is like this.

By the way, such an electrostatic precipitator performs electrostatic precipitation by an electric field between the two electrodes, and in the above-mentioned anode, the metal thin plate and the resin were fixed with an adhesive in order to prevent generation of a void space. , The anode and the anode contactor are joined, and the resin is peeled off from the metal in order to obtain electrical connection from the anode,
Since it is very difficult to expose the thin metal plate,
According to the applicant's proposal, as shown in FIGS. 9 and 10, a plurality of claws (9) which are pressed against a thin metal plate with sharp tips are cut and raised inside a contactor (4) having a U-shaped cross section. And push the end of the anode (1) from the opening side, and then slide the contactor in the same direction as the protrusion direction of the claw, orthogonal to the pushing direction, to move the claw (9) to the anode (1). A method of piercing the synthetic resin layer (P) and bringing it into contact with the metal thin plate (M) inside is used.

In addition to the above, some means for dissolving the resin with a solvent to expose the thin metal plate, and means for penetrating the resin with a staple or needle punch to make contact with the inner thin metal plate are considered.

(Problems to be Solved by the Invention) However, the former means using the slide claw method has been subsequently found to have a disadvantage that workability is significantly deteriorated due to the hardness of the resin, as a result of repeated studies. For example, if the resin is very hard, increasing the number of nails for reliability
The tensile force for biting the claws proportional to the number increases, and in some cases, the anode itself may be destroyed.

On the other hand, each of the latter means has a drawback that when it is dissolved, it takes too much time to dissolve, and in the resin penetration method, a needle penetrating by entrainment of the resin layer contacts the resin layer as shown in FIG. There is a drawback that the thin plate does not come into contact with the thin plate and reliable conduction cannot be obtained.

SUMMARY OF THE INVENTION The present invention aims to deal with the above-mentioned situation, and to find a suitable joining means for solving the problem so as to easily and reliably join the metal thin plate inside the anode and the anode contactor. is there.

(Means for Solving the Problems) In order to meet the above object, the present invention is characterized by the above-mentioned electrostatic precipitator that employs an anode in which a thin metal plate is molded with an insulating synthetic resin in the dust collecting portion. In principle, a self-tapping screw is used for joining the molded anode and the anode contactor, a prepared hole is provided in the anode, and the self-tapping screw having a screw diameter larger than the hole diameter is provided in the hole. A configuration in which the thin metal plate of the anode and the anode contact are connected by screwing and inserting is set forth in claim 1.

Then, the self-tapping screw is threadedly inserted to establish an indirect electrical connection between the thin metal plate of the anode and the anode contactor via the screw, without interposing the screw. The invention according to claim 3 is characterized in that the metal thin plate of the anode exposed to the outside by turning the screw in and out is brought into direct contact with the anode contactor to directly electrically connect the anode and the anode contactor.

Further, the invention according to claim 4 is such that a conductive paint is applied to a thin metal plate exposed at the end of the positive electrode, and the thin metal plate is fixed to the thin metal plate by a screw or the like to electrically connect the positive metal thin plate to the positive electrode contactor. To improve the reliability.

In the above case, in order to cause the anode metal thin plate to turn over, when the self-tapping screw insertion side is the front side, it is necessary to melt the resin around the tap hole on the back side to expose the metal thin plate easily. It is effective.

In addition to the known cutting means, resin melting means is applied to the exposure of the thin metal plate prior to the application of the conductive paint.

(Operation) As described above, the metal thin plate of the anode is securely bonded directly or indirectly to the metal thin plate on the side of the anode contact by fixing with the tap screw or applying conductive paint to the exposed part of the metal thin plate of the anode and fixing with screws. Therefore, it is possible to obtain a reliable electrical connection with a simple operation.

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

FIG. 1 shows a joint portion between an anode (1) and an anode contactor (4), which is a main part of the electrostatic precipitator of the present invention, and its peripheral structure is the seventh
As shown in the figure, the anode (1) has a structure in which the periphery of a metal thin plate (M) which is an electrode plate as shown in FIG. 8 is sealed with resin (P) by extrusion molding. The anode (1) and the anode contactor (4) are joined to each other by both members (1),
It is made by a self-tapping screw (11) screwed into a pilot hole (12) provided in (4).

Figure 2 (a) (b) (c) shows the details of the joint,
(A) shows a mode in which a self-tapping screw (11) is screwed and inserted into a prepared hole (12) having a diameter slightly smaller than the screw diameter of the screw (11) provided on the anode (1).

In this case, unlike the conventional staple and needle punch needle-shaped objects, the screw thread of the screw (11) cuts through the resin (P) of the anode and makes it easy to contact the pole made of a thin metal plate (M) such as aluminum foil. I am training. Therefore, even as it is, substantially reliable conduction can be obtained between the metal thin plates (M) of the screws (11).

On the other hand, the one shown in (b) is the prepared hole (1
2) is made relatively smaller than the screw diameter. For example, if the prepared hole diameter is 0.2 mmφ for a screw diameter of 3 mm, the electrode made of a thin metal plate (M) is inserted with a tap screw as shown in the figure. It is turned over and exposed to the outside. Therefore, in such a state, when the anode contactor (4) having a prepared hole is formed at the bottom and the screw (11) is tapped, the exposed metal sheet is exposed as shown in FIG. (M)
Comes into surface contact with the anode contactor (4) to further ensure the joining.

When joining the anode (1) and the anode contactor (4) as described above, the process proceeds as shown in FIGS. 3 (a), (b) and (c). Prepare a pilot hole (12) at the required location. In this case, considering the screw diameter of the self-tapping screw (11) to be used later, the hole is made small.
(Refer to (a)) Then, the resin around the hole (12) is melted using an ultrasonic welder or the like (see (b)), then the anode is inverted, the anode and the thin metal plate are polymerized, and fixed with screws. (See (c)), the two are bonded to each other to be electrically bonded to the molded anode.

Although the above is the case where the anode and the anode contact are joined only by the self-tapping screw, a conductive resin can be used to further enhance the reliability.

FIG. 4 and FIG. 5 show an embodiment in such a case. In FIG. 4, after the end face is exposed by cutting the tip of the molded anode (1), the part is included. Conductive paint (13) is applied in the vicinity.

Here, as the conductive paint used, there are known conductive resin paints including paints mixed with conductive powder, and after application, screw fixing, screwing or self-tapping screwing to the anode contactor, etc. By fixing with the fixing material (14), electrical connection is achieved.

FIG. 5 shows a case where the metal thin plate (M) inside is exposed by melting the resin in a required portion with an ultrasonic welder or the like instead of the above case of cutting the end face of the anode (1). Similarly, they are joined by applying a conductive paint and fixing them with screws or screws. In any of these cases, the resistance of the conductive resin is generally large in the latter stage resistance (R ₁ ) as shown in FIG.

The above is an example of the case where the anode (1) and the dust collecting ground electrode (2) have a coil winding structure, but the same applies to the case of flat plate bonding without being necessarily limited to this. Is. Further, although the present invention is the joining of the molded anode and the anode contactor, it is not excluded that it is also used for joining the dust collecting ground electrode and the grounding electrode contact.

(Effect of the invention) The present invention uses an electrode molded as described above as an anode of a dust collecting part, and in an electrostatic precipitator in which this is joined to an anode contactor, the anode and the contactor are electrically joined. A self-tapping screw is used to connect the metal thin plate inside the anode and the anode contactor indirectly through the screw or by directly exposing the metal thin plate inside the anode to the outside, and It can be joined only by drilling and screwing in the self-tapping screw, and the work is very simple, and the hardness of the outer surface resin of the anode is not affected, and the joining is easy. Moreover, there is no fear of breaking the anode due to nails or the like, and the reliability of bonding can be improved and workability can be greatly improved.

In particular, as in claim 3, the metal thin plate of the anode is exposed to the outside in a turned state, and directly on the metal thin plate forming the anode contactor.
When they are brought into contact with each other, the contact becomes a surface contact, and there is an effect that both electrodes can be conducted more reliably.

Further, the invention according to claim 4 is such that a conductive coating material is interposed in the joint portion, and it becomes possible to obtain an electrical connection from a very small exposed portion due to the penetrability of the coating material. It is expected to have the effect of improving the sex.

[Brief description of drawings]

FIG. 1 is a schematic external view showing a joining state of a joining portion between an anode and an anode contactor, which is a main part of the electrostatic precipitator of the present invention.
Figures (a), (b), and (c) are cross-sectional views showing an example of a joint structure using self-tapping screws at the same joint. In the case of joining, (c) is a diagram showing a joined state by direct joining. Further, FIGS. 3 (a), (b) and (c) are explanatory views showing the process leading to the screw insertion of the self-tapping screw, and FIG. 4 is another joining portion of the present invention for applying a conductive paint. FIG. 5 is a partial perspective view showing another embodiment of the metal thin plate exposing means for the anode in FIG. 4, and FIG. 6 shows an electric resistance state in the case of applying the conductive paint. FIG. 7 is a structural diagram and a circuit diagram, FIG. 7 is a perspective view showing a structural example of a contactor portion of a dust collecting portion in the electrostatic precipitator proposed previously, and FIG. 9 is a perspective view of the contact in FIG. 7, FIG. 10 is a cross-sectional view of the connection between the contact and the anode in FIG. 7, and FIG. 11 is a cross-sectional view showing the needle-anode joining state by needle punching. It is a figure. (A) …… Dust collecting part, (1) …… Anode, (2) …… Dust collecting ground electrode, (P) …… Insulating synthetic resin, (M) …… Metal sheet, (4) …… Anode Contact, (5) …… Ground electrode contact, (11) …… Self-tapping screw, (12) …… Prepared hole, (13) …… Conductive paint, (14) …… Fixing screws, screws, etc. Material,

Claims (4)

[Claims] 1. A dust collector (A), an anode (1) having a metal thin plate (M) around the periphery of which is molded with an insulating synthetic resin (P), and a dust collecting ground electrode (2) of the metal thin plate. It is constituted by a laminated body which is alternately laminated so as to interpose a flowable void, and the both electrodes (1) and (2) are connected to the anode contactor (4) at the end of the laminated body.
And a ground electrode contactor (5), respectively, and at the joint between the anode (1) and the anode contactor (4), a prepared hole (12) is provided in the anode (1) and the hole (12) is provided. The thin metal plate (M) of the anode (1) and the anode contactor (4) are connected by screwing and inserting a self-tapping screw (11) having a screw diameter larger than the hole diameter. An electric dust collector. 2. The electrostatic precipitator according to claim 1, wherein the metal plate (M) of the anode (1) and the anode contactor (4) are connected via a self-tapping screw (11). An electric dust collector. 3. The electrostatic precipitator according to claim 1, wherein the metal plate (M) of the anode (1) and the anode contactor (4) are turned up by the self-tapping screw (11) and are exposed to the outside. An electrostatic precipitator characterized by being connected by a thin metal plate (M). 4. An anode (1) having a metal collecting plate (M) around which a metal thin plate (M) is molded with an insulative synthetic resin (P) and a dust collecting grounding electrode (2) of the metal thin plate. It is constituted by a laminated body which is alternately laminated so as to interpose a flowable void, and the both electrodes (1) and (2) are connected to the anode contactor (4) and the ground electrode contactor (5) at the end of the laminated body. At the joint between the anode (1) and the anode contactor (4), the internal thin metal plate (M) is exposed at the end of the anode (1) and the conductive paint (13) is applied thereto. The thin metal plate (M) of the anode (1) is applied by applying it and fixing it with screws, crimping, etc.
An electrostatic precipitator characterized by being electrically connected to an anode contactor (4) through a conductive paint (13).