JPS6318441Y2 - - Google Patents

Description

[Detailed description of the invention] An electrostatic precipitator has an inlet for introducing dust-containing air, such as air containing dust such as spatter at a welding site, or air containing dust from other work sites, and an inlet for removing dust. inside the casing, which has an outlet that allows the purified air to flow out.
A collector consists of a large number of high-voltage electrode plates that apply high voltage and ground electrode plates that are arranged alternately in the airflow direction at intervals, and a discharge unit that ionizes dust on the upstream side of the airflow when viewed from the collector. An ionizer consisting of a large number of poles arranged at intervals is provided, and the dust ionized by the ionizer is removed from each ground electrode plate by high voltage and Coulomb force acting between both ground electrode plates. Some devices are designed to purify dust-containing air by collecting it on the plate surface.

In this type of electrostatic precipitator, when the dust collection time becomes long and dust accumulates on the surface of the ground electrode plate, the dust collection efficiency decreases, so it is necessary to remove the dust from the electrode plate.

Conventional electrode cleaning devices for electrostatic precipitators include, for example, those equipped with a scraper for scraping off the dust layer adhering to the electrode surface of the dust collecting electrode, as described in Japanese Utility Model Application Publication No. 49-93075, As described in Japanese Patent Application No. 55-51553, there is a device that is provided with a brush-like leakage material that slides between dust collecting electrode plates.

However, the former has the disadvantage that if dust adheres to each discharge electrode, it cannot be cleaned without disassembling the device, resulting in poor cleaning efficiency, and the latter has the disadvantage that brush-like leakage material occurs during operation. Since the inflow side between the dust collection electrode plates is blocked, the pressure drop of the dust-containing air becomes large, and if you try to improve the dust collection efficiency, you not only have to use a large fan, but also the dust If the material is moist or viscous, it will strongly adhere to the leaked material, and there is a drawback in that cleaning and dust removal cannot be easily removed by applying vibration.

The present invention aims to provide a cleaning device which is configured to simultaneously clean both the high voltage and ground electrodes and the discharge electrode of an electrostatic precipitator, and which can eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below based on the drawings. 1 is a casing, 2 is an inlet provided on the upper part of the casing 1, 3 is an outlet provided next to the inlet 2, and 4 is an outlet provided from the inlet 2. a passageway 5 that guides the dust-containing air that has flowed into the casing 1 to the bottom side of the casing 1;
is a syringe fan installed directly below the outlet 3, which sucks dust-containing air into the casing 1 from the inlet 2, passes through the ionizer and collector described later, and discharges it from the outlet 3 to the outside of the casing 1. be. Reference numeral 6 denotes a collector provided in the casing 1, in which a large number of high-voltage electrode plates 7 for applying high voltage and ground electrode plates 8 are arranged alternately in the airflow direction at intervals, and the left side of each high-voltage electrode plate 7 is arranged alternately in the air flow direction. between the connecting terminals 9 integrally protruding from three places on the top, middle, and bottom, and connecting terminals 1 integrally protruding from two places in the middle on the right side of the electrode plate 7.
A conductive spacer 11 is interposed between each ground electrode plate 8 and between the connection terminals 12 which are integrally protruded from two places in the middle on the left side of each ground electrode plate 8, and between the connection terminals 12 on the right side of each ground electrode plate 8. Up,
Connecting terminal 1 protrudes from three places, middle and bottom.
3 are connected to each other with conductive spacers 14 interposed between them. 15 is an ionizer provided on the upstream side of the airflow when viewed from the collector 6, and this is made up of a large number of discharge needles 17 on a metal plate 16.
The discharge electrode 18 provided with the high voltage and ground electrodes 7,
It consists of a plurality of sheets arranged at intervals of several 8 sheets. Reference numeral 19 denotes a cleaning bar inserted in the same direction as the air flow direction at intervals between adjacent high voltage and ground electrode plates 7 and 8, and at the location where the discharge electrode 18 is installed,
It consists of a bar having a sliding surface that rubs against both adjacent high voltage and ground electrode plates 7 and 8, and a support part 39 of a brush 38 that rubs against the discharge electrode 18, and the discharge electrode 18 is not installed. At this point, it consists of a bar having a sliding surface that rubs against both adjacent high-voltage and ground electrode plates 7 and 8. 20 is the collector 6 at each cleaning bar 19.
It is a connecting rod that connects the parts protruding from the lower end of the rod, and drive nuts 21 and 22 having screw holes provided inside are attached to both ends thereof as shown in the third figure. A connecting rod 23 connects the parts of each cleaning bar 19 that protrude from the upper end of the collector 6, and driving nuts (not shown) similar to the driving nuts 21 and 22 are attached to both ends of the connecting rod. 2
Reference numerals 4 and 25 indicate threaded rotary shafts into which the drive nuts 21 and 22 are screwed, respectively, and which are installed parallel to the electrode plates 7 and 8. Reference numerals 26 and 27 indicate drive nuts attached to both ends of the connecting rod 23. A rotating shaft with thread grooves is screwed together and installed parallel to the electrode plates 7, 8, and 28 is a sprocket 24', 25', attached to one end of each of the rotating shafts 24, 25, 26, and 27. An endless chain 29 is wound around the motor 26' and 27', and an endless chain 30 is wound between a sprocket attached to the rotating shaft of the motor and another sprocket attached to the rotating shaft 27. 31 is a limit switch, and when each cleaning bar 19 reaches the right side of the electrode plates 7, 8 as shown by the dashed line in FIG.
It operates to switch the flow of current to the motor 29 in the opposite direction. 34 is a limit switch, and when each cleaning bar 19 passes the left side of the electrode plates 7 and 8 as shown by the two-dot chain line in FIG. , which operates to cut off the power to the motor 29. 36 is a dust box provided below the passage 4 so that it can be pulled out from the casing 1; 37 is a dust box that receives dust scraped off from the electrode plates 7, 8 and the discharge electrode 18 by each cleaning bar 19; It is provided so that it can be pulled out from the bottom of the casing 1 to the outside of the casing 1.

Next, the operation of the electrode cleaning device for an electric dust collector having the above-mentioned structure will be described. The Sirotskov fan 5 is operated to suck dust-containing air into the casing 1. Then, the dust-containing air flows down along the passage 4 as shown by the diagonally shaded arrow in Figure 1.
The direction of the airflow is changed from below to below the ionizer 15, but if spatter or other coarse dust is included at the point where the direction of the airflow is changed, it falls into the dust box 36 and is removed. be done. The dust-containing air from which coarse dust has been removed passes through the ionizer 15 and the collector 6 in this order, but in the process of passing through the ionizer 15, the remaining dust is ionized by the discharge of the discharge electrode 18, and the ionized air is In the process of passing through the collector 6, most of the dust is collected on the surface of the ground electrode plate 8 due to the Coulomb force acting between the high voltage and ground electrode plates 7 and 8, and a small portion is collected on the surface of the ground electrode plate 8. It adheres to the surface of the plate 7 and is removed. The air, which has been purified by removing dust in this way, is discharged from the casing 1 through the airflow fan 5 through the outlet 3.

While removing dust from the air as described above, dust accumulates on the surface of the ground electrode plate 8 and also gradually adheres to the surfaces of the discharge electrode 18 and the high voltage electrode plate 7. When the dust collection efficiency decreases, the motor 29 is energized. Then, the rotation of the motor 29 is transmitted to each rotating shaft 24, 25, 26, and 27 through the endless chains 30, 28 so that they rotate synchronously, so that the connecting rod 2
Each drive nut attached to both ends of the electrodes 0 and 23 moves forward along each of the rotating shafts, and each cleaning bar 19 connects the adjacent electrode plates 7 and 8 and each discharge pole 1.
The electrode plates 7, 8 and each discharge pole 18, 1 move forward while sliding from the left side to the right side of the electrodes 8, 18.
Scrape off the dust adhering to 8.

As shown in the third figure, each cleaning bar 19 has a pointed front edge when moving forward, so that after the forward movement starts, the adjacent high voltage and ground electrode plates 7 and 8 are separated. It can be smoothly inserted into the space between the electrode plates 7 and 8 without getting stuck on the edges. When each cleaning bar 19 reaches the right side of the electrode plates 7 and 8, the limit switch 31
is activated and rotates the motor 29 in the reverse direction, so that each drive nut moves back along each of the rotating shafts, and each cleaning bar 19 also moves back. Each cleaning bar 19
When the cleaning bar 19 passes the left side of the electrode plates 7 and 8, the limit switch 34 is activated and the power to the motor 29 is cut off, thereby stopping each cleaning bar 19.

When each cleaning bar 19 is stopped,
Connection terminals 9 and 12 protrude from mutually shifted positions on the left side of the high voltage electrode plate 7 and the left side of the ground electrode plate 8.
contacts each cleaning bar 19, so the high voltage electrode plate 7
The creepage distance from the plate surface to the ground electrode plate 8 via each cleaning bar 19 is large, and current flow between the two electrode plates 7 and 8 is prevented.

Each time the dust collection efficiency decreases, each electrode plate 7, 8 and discharge electrode 18 are cleaned by repeating the reciprocating movement of each cleaning bar once or several times.

Since the present invention is constructed as described above, it is possible to simultaneously clean the electrode plate of the collector and the discharge electrode of the ionizer, thereby improving the cleaning efficiency. Moreover, since the cleaning bar is reciprocally driven, there is no dead space created when the cleaning bar is rotated, and the surface of the electrode plate can be thoroughly cleaned. Since the direction of the airflow is changed and coarse dust is removed, there is no need to block the inflow side between the electrode plates with leakage material, and there is no pressure loss of dust-containing air like in the conventional device described above. In addition, any kind of dust can be cleaned and removed, regardless of whether the dust is moist or viscous, without requiring a large fan, so that a decrease in dust collection efficiency can be prevented as much as possible.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view schematically showing an electrostatic precipitator incorporating the device of the present invention, Figure 2 is a diagram explaining the drive mechanism of the cleaning bar of the electrostatic precipitator, and Figure 3 is a diagram showing the relationship between the cleaning bar and the electrode plate. The explanatory diagram, FIG. 4, is a diagram showing the main parts of the cleaning bar drive mechanism. DESCRIPTION OF SYMBOLS 1... Casing, 2... Inlet, 3... Outlet, 6... Collector, 7... High voltage electrode plate, 8...
...Ground electrode plate, 15...Ionizer, 18...
... Discharge pole, 19 ... Cleaning bar, 20 ... Connection rod, 21, 22 ... Drive nut, 23 ... Connection rod, 24, 25 ... Threaded rotating shaft, 2
8... Endless chain, 29... Motor, 30...
... Endless chain, 31 ... Limit switch, 3
4...Limit switch, 38...Brush.

Claims (1)

[Claims for Utility Model Registration] (1) A large number of high-voltage electrode plates and ground electrode plates are arranged alternately in the air flow direction at intervals in a casing having an inlet for dust-containing air and an outlet for clean air. and an ionizer, which has a plurality of discharge electrodes arranged at appropriate intervals for ionizing dust on the upstream side of the airflow when viewed from the collector, and a cleaning bar is installed at each interval between the electrode plates. The cleaning bars are connected by a connecting rod installed so that they are reciprocated by a prime mover in a direction parallel to the electrode plates, and each cleaning bar is removed from the edge of the electrode plates. In an electrode cleaning device for an electrostatic precipitator, the electrode cleaning device is provided with a control mechanism for controlling the prime mover so as to stop the prime mover at a certain position. A passage for guiding the dust-containing air flowing into the casing to the bottom side of the casing, and a space for allowing the dust-containing air guided by this passage to pass to the outlet, are provided, and the collector and the ionizer are installed in this space. and an ionizer in which the discharge electrodes are arranged along the moving direction of the cleaning bar, and at the locations where the discharge electrodes are provided, the discharge electrodes are arranged at intervals between adjacent high voltage and ground electrode plates. A cleaning bar having a sliding surface that rubs against these electrode plates and a brush support part that supports a brush that rubs against the discharge electrodes is inserted in the air flow direction, and in the areas where the discharge electrodes are not provided, An electrode cleaning device for an electrostatic precipitator, characterized in that a cleaning bar having a rubbing surface that rubs against the adjacent high-voltage and ground electrode plates is inserted in the airflow direction at intervals between adjacent high-voltage and ground electrode plates. (2) The connecting rod consists of a connecting rod that connects one end of each cleaning bar and a connecting rod that connects the other end, and drive nuts are attached to both ends of these connecting rods. Each drive nut is screwed with a rotating shaft with threaded grooves parallel to the above-mentioned high voltage and ground electrode plates, and an endless chain or the like that rotates them synchronously is wound around this rotating shaft. An electrode cleaning device for an electrostatic precipitator according to scope 1.