JP3214215B2 - Electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric precipitator used for purifying air in a tunnel of a motorway, for example, and more particularly to an assembly structure of a high-voltage power supply circuit.

[0002]

2. Description of the Related Art An electric dust collector for a tunnel described above is
For example, it is disclosed and known in Japanese Patent Application Laid-Open No. 4-244249. FIG. 4 is a schematic diagram of the configuration of such an electric dust collector (water washing method). The electric dust collector is installed in a detour road of a tunnel, and the dust collector main body is located in a dust collecting room of the unit case 1. The charging unit 2 includes a charging unit 2, a dust collecting unit 3, a water washing nozzle 4, an inlet damper 5, an outlet damper 6, and the like. Here, the charging unit 2 and the dust collection unit 3 are supplied with power from a high-voltage power supply 7 outside the apparatus. The water washing nozzle 4 is connected to a washing water source via a water supply pipe 4a and a water supply pump 8, and periodically stops power supply, and closes the inlet and outlet dampers 5 and 6, and then closes the water washing nozzle 4. Cleaning water is sprayed on the charging unit 2 and the dust collecting unit 3 to wash off soot deposited on the electrode plate. Reference numeral 9 denotes a device for collecting and treating soot and drain generated by washing with water.

Next, FIG. 5 shows a conventional structure of a high-voltage power supply circuit of the above-structured electric precipitator, which is wired between an external high-voltage power supply 7 and a charging section 2 and a precipitating section 3 in the apparatus. . In the drawing, reference numeral 10 denotes a closed type power supply terminal box which is separately installed in the electric dust collector in correspondence with the charging unit 2 and the dust collecting unit 3, respectively. High voltage power supply 7
The terminal portion 11a of the power supply cable 11 connected to the power supply cable 11 is drawn in, the connection between the through bushing 12 and the power supply cable 11 is made in this terminal box, and the charging portion is further connected via the branch bus bar 13 connected to the other end of the bushing 12. 2. Power is supplied to the electrodes of the dust collecting unit 3 (supply voltage of the charging unit: 11 KV, power supply voltage of the dust collecting unit: 5.5 KV). Reference numeral 14 denotes a cross-connecting power supply cable that is wired between the terminal box and a terminal box disposed at another place in the machine.

[0004]

However, when the above-described power supply circuit having the conventional structure is employed in a water-cleaning type electric precipitator, the following problems arise. In other words, when the dust collected by the dust collecting section 3 is washed with water, the washing water is scattered and scattered in the dust collecting chamber, and the humidity of the indoor atmosphere is also 100%. For this reason, even if the power supply terminal box 10 incorporated in the machine is configured in a sealed structure, it is not possible to completely prevent moisture and moisture from entering, and during the long-term operation, the terminal portion of the power supply cable 11 may be wet. This may be a trigger, which may cause deterioration of the insulation of the power supply cable 11 and an accident of short circuit burning.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems and to provide a highly reliable electric precipitator capable of sufficiently withstanding a water washing method, and in particular, an assembling structure of a high voltage power supply circuit thereof. Is to provide.

[0006]

According to the present invention, a unit case includes a base and a dust collection chamber installed on the base. Is provided with a through bushing mounted on the base, a charging section, a dust collecting section, a frame, and a porcelain insulator mounted on the frame, and the base is provided with a height disposed outside the unit case. An electric precipitator having a wiring space for drawing in a power supply cable connected to a voltage source, wherein a power feeding bus bar for supplying power to a charging unit and a dust collecting unit is routed and wired in the dust collection chamber. The busbar for power supply is insulated and supported on the frame via the ceramic insulator, and the busbar for power supply and the power supply cable drawn into the wiring space are connected to the through bush. And that formed by connecting through a ring.

[0007] Further, the above configuration can be implemented with the following specific structure. (1) The power supply busbars routed and wired in the dust collection chamber are covered with a nonflammable insulating material. (2) A water washing nozzle branched from a washing water pipe is provided near the porcelain insulator and the through bushing disposed in the dust collection chamber.

(3) A metal shield for preventing electric shock at the ground potential is installed in the dust collection room around the through bushing installed on the base.

[0009]

In the above configuration, power is supplied to the charging unit and the dust collecting unit via a power supply cable, a through bushing, and a power supply bus bar. Here, the power supply cable is connected to the through bushing in the base of the unit case, which is isolated from the dust collection room. Not at all. Further, a power supply terminal box is not required in the dust collection chamber, and wiring can be directly performed to the electrodes of the charging section and the dust collection section via bus bars routed and laid in the dust collection chamber, thereby simplifying wiring construction.

Further, by covering the bus bar laid in the dust collection room with a nonflammable insulating material, a sufficient dielectric strength can be ensured even if the bus bar and the structure inside the machine (ground potential) are close to each other. Restrictions on wiring routes are eased, and high security can be ensured even in the event of a fire. Further, a water-washing nozzle is provided opposite to the porcelain insulator and the bushing installed in the dust collecting room where the dust concentration is high, so that the insulator and the bushing can be periodically washed with water to prevent insulation deterioration.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawings of the embodiment, the same members corresponding to FIGS. 4 and 5 are denoted by the same reference numerals. First, FIG.
In the first embodiment, a plurality of charging units 2 and three dust collecting units 3 are incorporated in a dust collecting chamber 1a of the unit case 1, and a rear part of the base 1b of the unit case 1 is separated from the dust collecting chamber 1a. A wiring space 1c is defined, and the front of the wiring space 1c is used as a drain receiver 1d for water washing.

Here, with respect to the wiring space 1c in the base, two through bushings (withstand voltage 1) corresponding to the charging portion 2 and the dust collecting portion 3 are provided on the upper plate of the base 1b.
1KV, 5.5KV) 15 is installed, and the feeder cable 7 (for 11KV and 5.5KV) drawn into the wiring space from the through bushing 15 and the external high-voltage power supply 7 inside the wiring space 1c. Are connected via a bus bar 17 supported by a porcelain insulator 16. Further, in the dust collecting chamber 1a, a power supply bus bar 18 having one end connected to the through bushing 15 is routed and wired to a wiring route as shown in the drawing, and the electrodes of the respective charging units 2 and the dust collecting unit 3 and the contact fittings ( (Not shown), and the power supply bus bar 18 is insulated and supported by a support frame 20 via a porcelain insulator 19 at a key point on a wiring route. The bus bar 18 is shown in FIG.
As shown in (b), it is screwed to a connection fitting 19a attached to the tip of the porcelain insulator 19. FIG. 2C shows a structure of a bus bar 18 in which a ceramic nonflammable insulating coating 18b such as alumina is applied to the peripheral surface of the bare conductor 18a.

In addition to the water washing pipes of the charging section 2 and the dust collecting section 3, a water supply pipe 21 is routed inside the dust collection chamber by a route as shown in the drawing. A water washing nozzle 22 is provided opposite the porcelain insulator 19 and the through bushing 15 described above. Reference numeral 23 denotes a nozzle that sprays cleaning water toward an electrode supporting insulator (not shown) incorporated in the charging unit 2 and the dust collecting unit 3.

Further, in order to prevent an electric shock accident of a maintenance worker who has entered the dust collection room during maintenance and inspection, the above-mentioned through bushing 15 and the power supply bus bar 18 rising from the bushing are surrounded, so that the dust collection room is enclosed. Is provided with a metal shield 24 having a ground potential formed of a wire net. FIG. 3 is an external view showing the installation state of the metal shield 25.

In the above configuration, the charging unit 2, the dust collecting unit 3
High-voltage power supply to the power supply cable 1 from the high-voltage power supply 7
1, through the through bushing 15 and the power supply bus bar 18. In addition, cleaning water is periodically sprayed through the water supply pipe 21 and the water cleaning nozzle 22 to the through bushing 15 and the porcelain insulator 19 disposed in the dust collection chamber where the dust concentration is high, thereby flushing the bushing and the insulator surface. To prevent insulation degradation due to contamination such as dust. In this case,
Since the wiring space 1c partitioned in the base 1b has a closed structure separated from the dust collecting chamber 1a, water droplets scattered in the dust collecting chamber due to washing with water or moisture filled in the dust collecting chamber is filled with water. There is no danger that the terminal of the power supply cable 11 will get wet by entering into the wiring space 1c, so that the insulation deterioration and burnout accident due to moisture of the power supply cable 11 can be avoided. In addition, the drainage of the washing water drains the dust collecting chamber 1a in the same manner as the water washing of the dust accumulated on the charging unit and the dust collecting unit.
After being drained to the outside through the drain receiving portion 1d of the base 1b, it is appropriately treated.

[0016]

As described above, according to the configuration of the present invention, the problem of the wiring structure of the high-voltage power supply circuit in the conventional electric precipitator, which is a problem with the insulation deterioration of the power supply cable due to the water washing, can be obtained. In addition to preventing short-circuit burnout accidents, reliability can be improved, and benefits such as simplification of wiring work for power supply circuits in dust collection rooms can be obtained.

Further, by covering the bus bar laid in the dust collection room with a nonflammable insulating material, a sufficient dielectric strength can be ensured even when the bus bar and the structure inside the machine (ground potential) come close to each other. Restrictions on wiring routes are eased, and high security can be ensured even in the event of a fire. Further, a water-washing nozzle is provided opposite to the porcelain insulator and the bushing installed in the dust collecting room where the dust concentration is high, and the insulator and the bushing are periodically washed with water, so that the insulation of the insulator due to contamination by dust and the like can be prevented from being lowered.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-voltage power supply circuit in an electrostatic precipitator according to an embodiment of the present invention.

2 (a) is a side view, FIG. 2 (b) is a front view, and FIG.
(C) is an enlarged cross-sectional view of the bus bar provided with insulation coating.

FIG. 3 is an external view showing an arrangement state of a metal shield in FIG. 1;

FIG. 4 is a schematic view of the configuration of an electric dust collector for a tunnel.

5 is a conventional structural diagram of the high-voltage power supply circuit in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit case 1a Dust collection room 1b Base 1c Wiring space 2 Charging part 3 Dust collection part 7 High voltage power supply 11 Power supply cable 15 Through bushing 18 Power supply bus bar 18b Non-combustible insulating coating 19 Porcelain insulator 20 Frame 21 Water supply pipe 22 Water washing nozzle 24 Metal Shield

Claims (4)

(57) [Claims] 1. A unit case comprising a base and a dust collecting chamber installed on the base, wherein a through bushing installed on the base is provided in the dust collecting chamber.
A charging section, a dust collecting section, a frame, and a porcelain insulator attached to the frame are arranged, and the base is a wiring space for drawing in a power supply cable connected to a high-voltage source arranged outside the unit case. In the dust collecting chamber, a feeding bus bar for feeding power to the charging unit and the dust collecting unit is routed and wired, and the feeding bus bar is connected to the frame via the ceramic insulator. And an electric dust collecting device, wherein the power feeding bus bar and the power feeding cable drawn into the wiring space are connected via the through bushing. 2. An electric precipitator according to claim 1,
An electric precipitator, characterized in that a bus bar for power supply routed in a dust collecting room is covered with a nonflammable insulating material. 3. The electric precipitator according to claim 1,
An electric precipitator, wherein a water washing nozzle is provided in opposition to a porcelain insulator and a through bushing disposed in a precipitating chamber. 4. An electric precipitator according to claim 1,
An electrostatic precipitator, wherein a metal shield for preventing electric shock of ground potential is installed in a dust collecting chamber surrounding a through bushing installed on a base.