JPH0226546B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a dust removal device for an electrostatic precipitator that blows off the dust collected on the electrode plate of the electrostatic precipitator by blowing high-speed air. (hereinafter referred to as an air blow device).

Configuration of conventional example and its problems As shown in FIGS. 1, 2, and 3, in the conventional air blowing device of an electrostatic precipitator, compressed air supplied from a compressor 1 passes through a pipe 2, It is controlled by a solenoid valve 3, passes through a nozzle pipe 4, and blows off the dust in the dust collecting section blown out from each nozzle 5. Further, the nozzle pipe 4 is supported between the main bodies A by bearings 6 and 7, and is further supported by an interlocking link 10 and an arm 1 by automatic reciprocating air cylinders 8 and 9.
1, the automatic reciprocating air cylinders 8 and 9 perform rotational and sliding movements.
It is operated by a small compressor 12. Note that an elongated bearing 13 is provided inside the bearing parts 6 and 7.

In the conventional embodiment described above, the nozzle 5 traces a locus shown in FIG. 3 and blows out compressed air to remove the scum. However, as shown in Fig. 1, the piping 2, the solenoid valve 3, the automatic reciprocating rotary air cylinder 8, the automatic reciprocating sliding air cylinder 9, the interlocking link 10, etc. are located on both sides of the main body A through which the collected air flows. Therefore, these act as resistance to the airflow passing through the air blowing device described above, which is not preferable. Further, since the automatic reciprocating air cylinder 8 rotates the four nozzle pipes 4 simultaneously via the interlocking link 10, it moves even unnecessary parts, and it is inefficient because power is not directly transmitted. Furthermore, since the nozzle pipe 4 is long at approximately 2 m, it is difficult to manufacture it immediately, and furthermore, the bearing portions 6 and 7 of the nozzle pipe 4 are long.
If an error occurs in the mounting position of the nozzle pipe 4 to the main body A, the long length of the bearing 13 is added to the problem, and malfunction may occur due to misalignment of the axis of the nozzle pipe 4.

Purpose of the Invention The present invention solves the drawbacks of the above-mentioned conventional examples, and is an electrostatic precipitator that is compact, has low air resistance, has low air consumption of the air drive device, and is easy to assemble, disassemble, and adjust. The purpose is to obtain a blowing device.

Structure of the Invention The present invention comprises an air cylinder that performs automatic reciprocating sliding motion and automatic reciprocating rotation motion independently of each other, a valve that operates based on a pneumatic signal, a bearing that has a built-in movable bearing that follows the eccentricity of a shaft, and a compressed air cylinder that The nozzle pipe has a nozzle pipe for discharging the air, and a frame for attaching these, one end of the nozzle pipe is attached to the piston rod of the air cylinder so that the axes thereof are the same, and the other end of the nozzle pipe is received by the bearing. It is composed of

DESCRIPTION OF EMBODIMENTS The embodiments will be described below with reference to FIGS. 4 to 8.

In the figure, 14 is a dust collector housing that houses a charging section 15, a dust collection section 16, and an air blow device 17 of a known two-stage electrostatic precipitator. Dust contained in the air flowing in the direction of the arrow 18 in the figure is collected by the dust collecting section 16. The collected dust is blown off by compressed air supplied by a compressor 19 by an air blower 17 at high speed. The air blow device 17 had a bearing 20 incorporating a valve operated by a pneumatic signal and a movable bearing that follows the eccentricity of the shaft, an automatic reciprocating slide air cylinder 21 which also served as a bearing, and a large number of nozzles 22. It is composed of a nozzle pipe 23 and a frame 24 that also serves as air piping. A small compressor 25 serves as a fluid pressure source for supplying high-pressure air to the automatic reciprocating slide air cylinder 21 and the valve in the bearing 20. A small compressor 26 supplies compressed air blown out from the nozzle 22. The automatic reciprocating rotating slide air cylinder 21 is shown in FIG. 6A.
As shown in B, the rotary actuator 27 and the air cylinder 2 are rotated due to the pressure difference between the air pressure on the supply side and the air pressure on the exhaust side of the vane type rotary actuator 27 that performs rotational motion and the air pressure on the exhaust side of the air cylinder 28 that performs sliding motion.
It is comprised of sequence valves 29 and 30 that automatically switch between supplying and exhausting high-pressure air to 8 and automatically reciprocating the air. The sequence valves 29 and 30 are generally used as pneumatic control equipment. The sequence valves 29 and 30 have a pneumatic circuit as shown in FIG. 7, and include a pilot valve 33 that is activated by the pressure difference between the pipe A 31 and the pipe B 32, and a main valve 34 that is activated by the pilot valve.
and throttle valves 35 and 36 that control the displacement. Here, sequence valves 29, 30
We will describe the operation of. Compressed air supplied from the fluid pressure source 25 enters the piston chamber 38 in the cylinder 37 through the main valve 34 and the pipe A31, and the piston 39 moves to the right. While the piston 39 is moving, the fluid pressure in the piston chamber 38 and pipe A31 and the piston chamber 40 and pipe B32 (throttle valve 3
The pilot valve 33 does not operate because the pressure difference with the back pressure generated (by the action of 6) is small.
When the piston 39 stops, the back pressure in the piston chamber 40 and conduit B32 decreases, so the pilot valve 33 is activated and the main valve 34 is switched.

Therefore, the compressed air supplied from the fluid pressure source 25 now passes through the pipe B32 and reaches the piston chamber 40.
The piston 39 moves to the left. Thereafter, operations similar to those described above are performed, and the piston 39 performs automatic reciprocating motion.

Sequence valves 29, 3 that function as described above
By using 0, the rotary actuator 27 and the air cylinder 28 perform mutually independent automatic reciprocating rotational movement and automatic reciprocating sliding movement. These two movements of rotation and sliding are
1 and piston rod 42, and the piston rod 42 performs automatic reciprocating sliding movements independent of each other. The automatic reciprocating rotating slide air cylinder 21 shown in the above embodiment may use other systems for the mechanism for performing rotational movement and sliding movement, as long as it performs mutually independent automatic reciprocating rotational movement. Also, bearing 2
0 is a valve 43, a spring 44, a movable bearing 45,
Elastic body 46, O-ring 47, and casing 48
The valve 43 is always connected to the hole 4 by a spring 44, and is attached to the right side of the frame 24.
9 is blocked, but there is a high-pressure air pipe 5 connected to the automatic reciprocating slide air cylinder 21.
By connecting the high-pressure air piping 51 branched from 0 and installed in a place other than where the air in the frame 17 passes through to the air supply port A52, the valve 43 is opened at the same time as the automatic reciprocating slide air cylinder 21 operates. Become. On the right side of the frame 24, the hatched part shown in FIG.
It flows into the nozzle pipe 23 through the valve 43.

Further, since the movable bearing 45 is supported by the casing 28 by the elastic body 46, the nozzle pipe 23 can slide even if the axis of the nozzle pipe 23 and the axis of the casing 48 of the bearing 20 do not coincide to some extent. It can be supported in this condition.

The nozzle pipe 23 , which is supported by the automatic reciprocating slide air cylinder 21 and the bearing 20 having the above-mentioned mechanism, rotates and slides back and forth by the automatic reciprocating slide air cylinder 21 . The tip traces a trajectory similar to the trajectory shown in FIG. 3, and similarly compressed air from the compressor 26 is blown out from the nozzle 22 through the bearing 20.

Effects of the Invention As described above, according to the present invention, by directly attaching the nozzle pipe to the automatic reciprocating slide air cylinder, power transmission can be made much more efficient than the conventional method, and each nozzle pipe that operates It is equipped with an automatic reciprocating slide air cylinder, and the bearing that supports the other end of the nozzle pipe can follow the slight deviation of the axis, so the frictional resistance caused by the bearing can be reduced compared to conventional models, reducing the load. It can save energy consumption and improve durability. Furthermore, by integrating the air drive device and the bearing, the bearing, the valve inside the bearing, the frame, and the piping, the piping and solenoid valves required in conventional systems can be omitted, and the area around the bearing can be made much more compact.

Therefore, the effective cross-sectional area through which the air flow flows through the electrostatic precipitator increases, reducing pressure loss to the air flow and reducing energy consumption of equipment that generates the air flow.

[Brief explanation of drawings]

Figure 1 is a perspective view of the air blowing device of a conventional electrostatic precipitator, Figure 2 is a sectional view of the bearing part of the air blowing device, and Figure 3 shows the trajectory drawn by the tip of the nozzle during dusting. 4a is a side view of the entire electrostatic precipitator adopting an embodiment of the device of the present invention, FIG. 4b is a plan view of the same, and FIG. 5 is an air blowing device in an embodiment of the present invention. Perspective view of 6th
Figures A and B are side and front cross-sectional views of the automatic reciprocating slide air cylinder, Figure 7 is a pneumatic circuit diagram of the sequence valve, and Figure 8 is a cross-sectional view of the bearing portion. 20...Bearing, 21...Automatic reciprocating rotating slide air cylinder, 23...Nozzle pipe, 24
...Frame, 42...Piston rod, 43...
...Valve, 45...Movable bearing.

Claims (1)

[Claims] 1 An air cylinder that performs automatic reciprocating sliding motion and automatic reciprocating rotation motion independently of each other, a valve that operates based on air pressure signals, a bearing with a built-in movable bearing that follows the eccentricity of the shaft, and a nozzle pipe that discharges compressed air. and a frame for attaching these, one end of the nozzle pipe is attached to the piston rod of the air cylinder so that the axis is the same, and the other end of the nozzle pipe is received by the bearing. Air blow device.