JPH03146148A - Electric dust collector - Google Patents

Abstract

PURPOSE:To prevent the production of an abnormal discharge by providing a protective tube and a discharge wire support insulator at each end of a discharge wire. CONSTITUTION:A protective tube 12 is provided at each end of a discharge wire 10 and enclosed with a discharge wire support insulator 13. The discharge wire support insulator 13 has the open end part of its cylindrical hole facing toward the central side of the discharge wire and the outer periphery of the insulator 13 is partially supported by an insulator receiving rib 16 and the edge of a discharge wire support cover 17. This arrangement secures a creeping distance from the protective tube 12 through the open end part 14 of the insulator 13 and then through a cylindrical outer periphery to a discharge wire support part of a front cover 1, i.e., the insulator receiving rib 16 and the edge of the discharge wire support cover 17, whereby the production of an abnormal discharge can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to the structure of a discharge wire support portion of an electrostatic precipitator in a household air cleaner or the like.

[Conventional technology]

In an electrostatic precipitator, dust is charged and the charged dust is collected electrically, and the structure of the charging part is usually a combination of several discharge wires and an electrode plate facing them. Be taken. A high voltage of several thousand volts is applied to these discharge wires from a high-voltage generation power source installed inside the main body, connected to the high-voltage wires, but the part that supports these multiple discharge wires and connects to the high-voltage wires is Due to the high potential, abnormal discharge is likely to occur, and as the main body is miniaturized, it is an important issue to ensure safety without abnormal discharge.

FIG. 8 of Japanese Patent Publication No. 61-24054 shows the structure of a discharge wire, a protective tube placed over it, and a discharge wire support plate.

[Problem to be solved by the invention]

However, since the material of the soft protective tube is not nonflammable and the coating thickness is thin, if the area near the discharge wire support plate becomes dirty due to long-term use, the same phenomenon occurs as the creepage distance as an insulator is shortened. Therefore, there is a concern that a high voltage may be intensively applied to the protective tube, and the structure is insufficient to prevent any abnormal discharge from occurring. There is an idea of using porcelain such as insulators in such cases, but when it comes to supporting the discharge wires of electrostatic precipitators in household air purifiers, etc., the following points must be taken into consideration, and these must be satisfied. There was nothing to do.

[Means to solve the problem]

The purpose of the present invention will be described below. First, the discharge wire support parts at both ends of the discharge wire are not made of non-combustible material, but have a shape that ensures sufficient creepage distance even if they are made of plastic material.

The main body can be assembled without a complicated structure, and secondly, it has a structure that blocks the flow path so that the air from the air purifier does not flow into the parts located outside of both ends of the discharge wire. Thirdly, it needs to have a structure that can be combined with a tungsten wire having a wire diameter of about 0.1 to 0.3.

The present invention provides a protective tube at both ends of the discharge wire, a cylindrical discharge wire support insulator that covers the outer periphery of the protective tube, and a grooved opening of the discharge wire support insulator toward the center of the discharge wire to improve the creepage. This is to ensure distance.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained below with reference to the drawings. In FIG. 1, the main body includes a front cover 1. Frame 2. It consists of a rear cover 3. The dust collection filter 4 is a filter frame 4a.
The filter is engaged with the frame 2 through the filter so as to be in contact with the periphery of the filter. The centrifugal fan 5 for circulation is directly connected to the rotating shaft of the motor 6. In the suction lower of front cover 1,
Net filter 8 is attached. 9 is an air outlet. Therefore, dust collection filter 4. Centrifugal fan for circulation4. The motor 6 is disposed in a flow path extending from the suction lower to the outlet 9. 10.11 is a discharge wire as a charging part for an electrostatic precipitator, and a counter electrode plate. Dust collection filter 4
It is placed in front of the .

As shown in FIGS. 2 and 3, the discharge wire 10 uses a bare tungsten wire having a wire diameter of about 0.1 to 0.3 in terms of discharge function. Because it is a thin and hard material, it is easy to break if it is bent or rubbed. A protective tube 12 is installed at both ends of the discharge wire 1o.
is inserted. The vinyl chloride tube is flammable and good. 13 is a discharge wire support insulator. The main material is porcelain, which is a noncombustible material that will not burn even if exposed to flame for several minutes.

It is cylindrical in shape, has an inner diameter slightly larger than the protective tube 12, and is placed over the outer periphery of the protective tube. Grooved shape 14 of the tube mouth facing the discharge wire center side of the discharge wire support insulator
It is said that In other words, it refers to a two-step diameter having a dimension between the outer periphery of the discharge wire support insulator and the outer periphery of the protective tube 12.

15 is a brim shape. The discharge wire support insulator 12 is supported by sandwiching a part of its outer periphery between the insulator rib 16 provided on the front cover 1 and the edge 17a of the discharge wire support section cover 17 that will be assembled later. In other words, it functions as a supporting wall and a ventilation blocking wall. 18 is a protrusion that stops movement. 19 is a conductive tension spring that fixes the end of the discharge wire, and 20 is a conductive discharge wire support plate that connects the plurality of tension springs 19.
It is connected via a high voltage supply line 21 from a high voltage power source (not shown) provided within the main body. The fixing screw 22 of the discharge wire support plate 20 has a protective sleeve 23 made of porcelain placed around the outer periphery of the screw fixing boss to prevent creepage leakage due to dirt. 24
is a ground potential terminal of the counter electrode plate 11. Reference numeral 25 denotes a discharge wire stain prevention cover for preventing dust from colliding and adhering to the outer periphery of the discharge wire due to the air flow flowing around the discharge wire 10. The tension spring 19 is stretched outside the discharge wire support insulator 13 at an angle θ of about 10 degrees.

Describe how to use an air purifier. Dust, dust.

Dust contaminated with cigarette smoke, etc. is removed by the suction force of the centrifugal fan 5 through the suction lower of the front cover 1 and the net filter 8.
Between the discharge wire 10 and the counter electrode plate 11, a dust collection filter 4 is provided.
The air is circulated indoors through the air outlet 9. The net filter 8 removes coarse dust by mechanical collection. The dust collection filter 4 is an electrostatic filter covering an activated carbon fiber filter, and has dust removal and deodorizing effects. FF
The charged part of 1A@ and the counter electrode plate normally charges dust positively and causes it to strongly adhere to and collect on the electrostatic filter using electric force. It has the effect of efficient collection of micron particles and long life. Functionally, a high voltage of several thousand volts is applied to the discharge wire 10, so the vicinity of the discharge wire support becomes dirty with dust due to long-term use, which is the same phenomenon that causes the creepage distance as an insulator to become short. Abnormal discharge occurs when the insulation performance becomes weak. In the event that abnormal discharge occurs, it may generate noise and cause radio wave interference to other audio equipment, etc., or there may be a risk of smoke and ignition, so it is extremely important to prevent abnormal discharge. .

〔Effect of the invention〕

The effects of the present invention will be described below.

In the charging section structure of the present invention, a soft protective tube 12 is inserted into a discharge wire 10, and a discharge wire support insulator 13 is covered over the outer periphery of the discharge wire 10, thereby forming a discharge wire tube.

Groove shape of discharge wire support insulator 14. The discharge wire support part of the front cover 1, that is, the insulator support, has a creeping distance from the rib 16 to the edge of the discharge support part cover 17 through the cylindrical outer periphery. In addition to its properties, it is possible to provide an optimal shape as a discharge wire support part. The insulator holder has 16 ribs.
Due to the ventilation blocking action of the discharge wire support section cover 17, the portion located outside the discharge wire support insulator can be structured to block the flow path so that wind does not flow into it. Assembling the discharge line part,
First, a pair of protection tubes 12 and a discharge wire support insulator 13 are fitted and placed on the discharge wire 1o, and tension springs 19 are fixed to both ends. Fold the tungsten wire back to prevent twisting, and cover the twisted portion with a protective tube. The hook portion of the tension spring is fixed to the discharge wire support plate 20. Since tension springs are conductive, they can also be electrically connected. It is also possible to use only one tension spring instead of both ends and omit one end. The tension spring is approximately 1
Since it is stretched at an angle of approximately 0 degrees, there is a frictional force between the outer periphery of the protective tube and the inner periphery of the discharge wire support insulator, so that the protective tube will not be pulled out toward the center of the discharge wire after assembly.

Since the discharge wire support insulator 13 has a structure that does not move after one assembly and a protective tube is provided on the inner periphery, even a thin tungsten wire with a diameter of 0.1 to 0.3 will not break.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main body showing one embodiment of the present invention;
The figure is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 1...Front cover, 4...Dust collection filter 5...
・Centrifugal fan, 6...Motor, 10...Discharge wire,
11... Counter electrode plate, 12... Protective tube, 13
...Discharge wire support insulator, 16...Insulator support is rib, 17
...Discharge wire support cover

Claims (1)

[Claims] 1. A dust collection filter (4), a centrifugal fan (5) for circulation, and a motor (6) are placed inside the main body in the flow path from the suction port (7) to the air outlet (9). Dust filter (4)
In a configuration in which a plurality of discharge wires (10) and a counter electrode plate (11) are arranged in the front stage, a protective tube (12) is provided at both ends of the discharge wire (10), and a discharge wire support is provided to cover the outer periphery of the protective tube (12). An insulator (13) is provided, and a discharge wire support insulator (1
3) The tube opening facing toward the center of the discharge wire has a beveled shape, and a part of the outer periphery of the discharge wire support insulator is supported by the insulator receiving rib (16) and the edge of the discharge wire support cover (17). Electrostatic precipitator.