JPS60168552A - Insulator air blow apparatus of electric dust collector - Google Patents

Abstract

PURPOSE:To hole an insulator to a good insulating state, by blowing off compressed air from the nozzles provided on the circumference of a rotary shaft and rotating the nozzles themselves by the propelling force of said compressed air while uniformly impinging air to the surface of the insulator to shake off dust. CONSTITUTION:When compressed air is sent into an air supply pipe 1, it passes a rotary joint 3, a rotary shaft 2, a branched pipe 4 and nozzles 5 to be discharged from blow-off orifices 6 as jet streams and the rotary shaft 2, the branched pipe 4 and the nozzles 5 are rotated by propelling force generated at this time. Therefore, air blown off from the blow-off orifices 6 are impinged to the entire surface of an insulator 7 and the surface of the insulator 7 receives uniform air blow to make it possible to prevent the remaining of dust receiving no shaking-off caused by the weakness of the air stream. Because the air blow-off orifices 6 are always moved, even if the accumulation of dust is once generated by the strong air stream, the air stream with proper power is impinged to the insulator 7 directly thereafter and, therefore, dust is easily shaken off. As a result, the surface of the insulator 7 is always held in a good insulating state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air blow device for cleaning dust adhering to an insulator of an electrostatic precipitator.

Conventional Structures and Problems Electrostatic precipitators use insulators to support electrodes, etc., but there is a problem in that the surfaces are contaminated by dust during use, resulting in poor insulation. Conventionally, one method to prevent this is the air blow method, which blows compressed air onto the insulator to blow away the dust. FIG. 1 shows an example of this, where 101 is a live part of an electrostatic precipitator, 102 is a grounding part of the electrostatic precipitator, and these are insulated and supported by an insulator 103. Further, 104 is a nozzle for blowing an insulator provided in a grounded casing 105, and is fixed opposite to a predetermined position of the insulator 103. 106 is a bolt for fixing the insulator 103. Also, FIG. 2 is a cross-sectional view taken along the X-x plane in FIG. To prevent. However, in this device, the air flow blown out from the nozzle 104
03, and the effect of blowing off dust is uneven depending on the position of the surface of the insulator. In other words, where the air flow is weak, some dust may be left behind, while where the air flow is strong, the second As shown in Figure A, the dust that is thrown up by the brushing off is accompanied by the airflow again and violently collides with the surface of the insulator 103, causing the dust to accumulate in that area and resulting in poor insulation. was.

Purpose of the Invention The present invention uses the driving force of compressed air blown out from a nozzle installed on the circumference of a rotating shaft to rotate the nozzle itself, uniformly applying air to the insulator surface and brushing off dust. The purpose is to keep the insulator in good insulation condition.

Structure of the Invention The present invention provides an air blowing nozzle on the circumference of a rotating shaft,
A nozzle is installed so that the air blowing angle forms a certain angle in the tangential direction on the circumference of the rotation axis with respect to the rotation axis, and due to the driving force of the compressed air blown from this nozzle, the nozzle rotates and hits the insulator surface. Uniform air blowing eliminates the dust left behind due to too weak airflow and the accumulation of dust due to too strong airflow, and it is possible to keep the insulator in a good insulating state at all times.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

In the figure, 1 is an air supply pipe into which compressed air is sent, 2
is a pipe-shaped rotating shaft through which air can pass, and is rotatably attached to the air supply pipe 1 via a rotary joint 3.

4 is a branch pipe branched in the circumferential direction from the rotating shaft 2, and 6 is a nozzle provided at both ends of the branch pipe 4, such that the outlet 6 at the tip is tangential to the circumference of the rotating shaft 2. It is installed in the direction.

7 is an insulator charging part 1 located on the extension of the rotating shaft 2 of the branch pipe 4
2 and the ground portion 13 in an insulated manner.

Reference numeral 8 denotes a housing, to which an air supply pipe 1 is connected to the inlet side. 9 is a rotor, which is rotatably supported by the housing 8 by a bearing 1o, and has a rotating shaft 2 on the outlet side.
is connected.

A seal ring 11 is made of rubber and seals between the housing 8 and the rotor 9. With these, the inlet supply pipe 1
Although the rotary shaft 2 and the rotary shaft 2 are rotatable with respect to each other, compressed air can be sent from the inlet supply pipe 1 to the rotary shaft 2 as shown by the arrow without causing air leakage.

In the above configuration, when compressed air is sent into the air supply pipe 1, the compressed air passes through the rotary joint 3, the rotating shaft 2, the branch pipe 4, and the nozzle 5, and is released as a jet from the outlet 6, due to the thrust generated at that time. The rotating shaft 2, branch pipe 4, and nozzle 6 rotate. Therefore, the air blown out from the air outlet 6 hits the entire surface of the insulator, and the surface of the insulator is uniformly blown, thereby preventing the air from being left behind due to a weak air flow.

On the other hand, regarding the accumulation of dust due to the strong air flow shown in the conventional example, since the air outlet 6 is constantly moving,
Even if a strong air flow causes a buildup to occur, it is easily brushed off because it is immediately followed by an air flow of appropriate strength. Therefore, the surface of the insulator 70 is always kept in a good insulating state. -1 Effects of the Invention As described above, according to the present invention, the air flow of the air blower can be moved without using any other power, and the air blow device dust can be uniformly brushed off the insulator surface.
It becomes possible to maintain the insulator in a good insulating state. Furthermore, by obtaining more effective air blowing, less compressed air is required, the capacity of compressed air generation equipment can be reduced, and running costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an air blow device in a conventional example, FIG. 2 is a cross-sectional view of the same, FIG. 3 is a side view of an air blow device in an embodiment of the present invention, and FIG. Y-Y
The arrow view and FIG. 5 are cross-sectional views of the rotary joint portion. 2... Rotating shaft, 3... Rotating joint, 6...
... Nozzle, 6... Air outlet. Name of agent: Patent attorney Toshio Nakao and 1 other person
Iv4 @Figure 2 @ 3 Figure 4r54 Figure 5

Claims (1)

[Claims] Equipped with an insulator that insulates and supports the live part and the ground part, and an air blowing nozzle that removes dust etc. attached to the insulator,
The air blowing nozzle is rotatably provided on the circumference of the rotating shaft via a rotary joint, and the air blowing angle of the air blown out from the air blowing port is in a tangential direction on the circumferential axis of the rotating shaft with respect to the rotating shaft. An insulator air blow device for an electrostatic precipitator with nozzles attached at an angle.