JP3313653B2 - Electrostatic 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 electrostatic precipitator.

[0002]

2. Description of the Related Art Generally, a case of an electrostatic precipitator for collecting mist and the like has a lower suction port for sucking air into the case and an upper discharge port for discharging air from the case to the outside. Are formed. An air flow path is formed between the lower suction port and the upper discharge port. More specifically, as shown in FIG. 6, two electrode support plates 50 and 51 are arranged at predetermined intervals on the upstream side and the downstream side in the middle of the air flow path A1. The grid 51 has lattice-shaped through holes 50a and 51a for allowing air to pass therethrough. The base ends of rod-shaped upper and lower discharge electrodes 52 and 53 are connected to the respective electrode support plates 50 and 51. Further, a cylindrical upper and lower dust collecting electrodes 54 and 55 are provided in a case (not shown) so as to cover the periphery of each discharge electrode 52 and 53, and are sucked from the lower suction port (not shown). The air flows through the dust collecting electrodes 54 and 55 and is discharged from an upper discharge port (not shown).

[0003] Then, when the use of an electrostatic precipitator, a voltage to both current Chirikyoku 54, 55 and two discharge electrodes 52 and 53 is applied to generate a direct current electric field between the two electrodes, the two current Chirikyoku 54 by the DC electric field , 55 are charged with fine particles such as mist contained in air flowing through the inside. Then, the mist or the like moves toward the inner surfaces of the dust collecting electrodes 54 and 55 due to the Coulomb attraction, and is attached to the inner surfaces of the dust collecting electrodes 54 and 55. As a result, the mist or the like is removed from the air, and the air from which the mist or the like has been removed is discharged from the upper discharge port.

[0004]

However, in the above electrostatic precipitator, since two electrode support plates 50 and 51 are required, a plurality of electrode support plates 50 and 51 are provided in the middle of the air flow path A1.
If there is, the flow velocity of the air decreases. As a result, there is a problem that the dust collection efficiency is reduced.

An object of the present invention is to improve dust collection efficiency by preventing a flow velocity of air flowing on an air flow path from decreasing. Another object of the present invention is to reliably insulate the discharge electrode.

[0006]

[Summary of the invention according to claim 1, the discharge electrode is provided in the cylindrical inside collecting electrode, a direct current electric field between two electrodes by applying a voltage to the electrode discharge and the dust collection electrode Raises, in particulate electrostatic precipitator to be attached to the dust collecting electrode of the dust in the fluid flowing through the dust collecting in-electrode by the DC electric field, provided the single support member in the flow path of the object to be dust fluid, upstream of definitive to the support member, a plurality union in which the upstream
Each of the plurality of first discharge electrodes for I have been dust collection electrode
At the same time, and a plurality of second collection electrodes for the plurality of combined dust collection electrodes on the downstream side.
The gist of the present invention is that the base ends of the discharge electrodes are connected to each other, a sharpened portion is formed at the tip of each discharge electrode, and the outer peripheral surface of each discharge electrode is covered with an insulator except for the sharpened portions.

[0007]

[0008] The invention according to claim 2 is the invention according to claim 1, wherein the first and second discharge electrodes is summarized in that which is composed of a single electrode member. Claim
According to a third aspect of the present invention, in the first or second aspect of the present invention, the tip of the first and second discharge electrodes has a dust removal fluid formed on a dust collection electrode corresponding to each discharge electrode. The point is that it is extended to the vicinity of the entrance.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the case 12 of the electrostatic precipitator 11 is formed in a rectangular box shape, and air containing mist or the like as a fluid to be removed is introduced into the case 12. . Although not shown, an upper suction port for sucking air containing mist and the like is provided at an upper portion of the case 12 and a discharge port for discharging air from which mist and the like are collected by the electrostatic precipitator 11 is provided at a lower portion of the case 12. A lower discharge port is formed. That is, the vertical direction of the case 12 (the vertical direction in FIG. 1) is an air flow path A indicated by an arrow in FIG. , And is discharged to the outside of the case 12 through the lower discharge port.

As shown in FIG. 1, a plurality of upper square pipes 13 made of a conductor such as aluminum are provided as dust collecting poles on the upstream side of the case 12 so as to extend in a vertical direction. The pipe 13 is fixed to a bracket 14 attached to the inner surface of the case 12. The upper square pipe 13 is connected to a power supply 15 and is charged to a negative polarity by the power supply 15. As shown in FIG. 2, the upper square pipes 13 are similarly formed in a square cross section, and are welded to each other by being combined in a square shape with ten steps each in the vertical direction and the horizontal direction. As shown in FIG. 4, the upper end of each upper square pipe 13 is an air inlet 13a, and the lower end is an air outlet 13b.

Further, as shown in FIGS. 1 and 2, slits 16 are formed at the corners of the combined upper square pipes 13 as communicating portions extending in the vertical direction, respectively. The inside and outside of each upper square pipe 13 are communicated. The slit 16 extends vertically from the inlet 13a of the upper square pipe 13 toward the outlet 13b.

[0012] As shown in FIG.
A bracket 17 is provided on the inner surface of the case 12
A plurality of insulating columns are provided upright on the upper end of the bracket 17. An electrode support plate 19 as a support member is attached to the upper end of the insulating support 18. That is, a single electrode support plate 19 is provided on the air flow path A in the case 12. The electrode support plate 19 is connected to the power supply 15 and is charged to a positive polarity by the power supply 15. The whole of the electrode support plate 19 including the upper surface and the lower surface is covered with an insulator made of nylon resin or the like. Also, as shown in FIGS.
9, a plurality of rectangular through holes 19a are formed at equal intervals in the left-right direction (left-right direction in FIG. 4).

As shown in FIG. 1, below the electrode support plate 19, inside the bracket 17, a plurality of lower square pipes 20 made of a conductor such as aluminum are used as dust collecting electrodes so as to extend in the vertical direction. Installed.
The lower square pipe 20 is connected to a power supply 15 and is charged to a negative polarity by the power supply 15. As shown in FIG. 3, the lower square pipe 20 is formed in a square cross section in the same manner as the upper square pipe 13, and is combined in a vertical and horizontal direction with 10 steps (100 in total) each in a square shape. Are welded together. As shown in FIG. 4, the upper end of the lower square pipe 20 is connected to an air inlet 20a.
The lower end is an air outlet 20b. That is, the lower square pipe 20 and the upper square pipe 13 communicate with each other via the through hole 19 a of the electrode support plate 19.

As shown in FIGS. 4 and 5, a plurality of mounting holes 19b are formed in the electrode support plate 19 along the longitudinal direction of the through holes 19a. This mounting hole 19
An electrode pin 21 as an electrode member extending in the vertical direction corresponding to each of the upper and lower square pipes 13 and 20 is inserted through b, and the periphery of the electrode pin 21 is fixed by welding.
The electrode pins 21 are loosely inserted into the upper and lower square pipes 13 and 20, respectively. This electrode pin 21 is
6 and extend in the same direction as that of FIG. The electrode pin 21 is a single rod-shaped member, and the upstream side of the air flow path A with the electrode support plate 19 as a boundary is an upper discharge electrode 22 as a first discharge electrode. The downstream side of A is a lower discharge electrode 23 as a second discharge electrode. That is, the upper and lower discharge electrodes 22 and 23 are opposed to each other so that their axes L1 and L2 coincide with each other.

[0015] Sharp portions 22a and 23a are formed at the tips of the discharge electrodes 22 and 23, respectively. The sharp portion 22a of the upper discharge electrode 22 is provided at the inlet 13a of the upper square pipe 13.
The sharp portion 23 a of the lower discharge electrode 23 is located near the inlet 20 a of the lower square pipe 20. That is, the tips of the discharge electrodes 22 and 23 extend near the inlets 13a and 20a of the square pipes 13 and 20, respectively. Furthermore, since the outer peripheral surfaces of the discharge electrodes 22 and 23 are covered with an insulator made of nylon resin or the like except for the respective sharpened portions 22a and 23a, the upper and lower square pipes 13 and 20 are reliably insulated. Have been. Therefore, the electrode pins 21 are charged to a positive polarity similarly to the electrode support plate 19.

The power source 15 controls the two discharge electrodes 2.
When a voltage of about 10,000 volts is applied to the upper and lower square pipes 13 and 20, a strong force is applied between the positively charged two discharge electrodes 22 and 23 and the negatively charged upper and lower square pipes 13 and 20. Do a DC electric field is formed. As a result, the upper and lower square pipes 13 and 2 are
A shower of positive ions toward zero is generated. Therefore, when air containing a mist or the like is introduced into the upper and lower square pipes 13, 20, the mist is positively charged by colliding with positive ions, and receives a strong Coulomb force due to a DC electric field, thereby causing the upper and lower square pipes 13, 20 to fall. Move in the direction toward the inner surface of the. The mist is attached to the inner surfaces of the upper and lower square pipes 13 and 20.

Next, the operation of the electrostatic precipitator 11 configured as described above will be described. When air containing fine particles such as mist is sent into the case 12 through an upper suction port (not shown) of the case 12, the air is introduced into the upper square pipe 13. At this time, when a voltage is applied to the electrode pin 21 and the upper square pipe 13, discharge is performed from the sharp portion 22 a of the upper discharge electrode 22 toward the inlet 13 a of the upper square pipe 13. Then, a DC electric field is generated between the upper discharge electrode 22 and the upper square pipe 13, and the mist or the like contained in the air is drawn to the upper square pipe 13 by the DC electric field, and the inner surface of the upper square pipe 13 Is attached.

When the electric discharge is generated from the sharp portion 22a of the upper discharge electrode 22, a DC electric field is generated so as to swirl from the slit 16 to the outside of the upper square pipe 13 (see the arrow S shown in FIG. 1). . Due to the spiral DC electric field, mist and the like contained in the air are swirled, and the upper square pipe 13
And is attached to the outer surface of the upper square pipe 13. Therefore, it is attached not only to the inner side surface of the upper square pipe 13 but also to the outer side surface.

Further, the sharp portions 2 of the discharge electrodes 22 and 23 are formed.
Since the air outlets 2a and 23a extend near the inlets 13a and 20a, the flow of the air flowing through the air flow path A can be maintained even if the air charged to the negative pole by the discharge goes out of each of the square pipes 13 and 20. The pressure makes it easier to return inside.

Further, air from which mist or the like has been removed by the upper square pipe 13 is supplied to the outlet 13 of the upper square pipe 13.
b and each through hole 19 a of the electrode support plate 19, and is introduced into the lower square pipe 20. At this time, the electrode pins 21
When a voltage is applied to the lower square pipe 20, the sharp opening 23 a of the lower discharge electrode 23 causes the inlet 20 of the lower square pipe 20.
It is discharged toward a. Then, similarly to the upper square pipe 13, a mist or the like contained in the air is attached to the inner side surface of the lower square pipe 20 by the DC electric field.

The air purified by passing through the upper and lower square pipes 13 and 20 is discharged to the outside of the case 12 from a lower discharge port (not shown) of the case 12. On the other hand, when the mist and the like attached to the inner and outer sides of the upper square pipe 13 and the inner side of the lower square pipe 20 are combined with each other, they become droplets. It descends along the way and drops downward from the outlets 13b, 20b of the upper and lower square pipes 13, 20. Then, the dropped droplets are discharged to the outside of the case 12 through a discharge hole (not shown) formed in a lower portion of the case 12.

This embodiment has the following effects. (1) Even if two square pipes 13 and 20 are provided separately on the upstream side and the downstream side of the electrode support plate 19, the electrode support plate 19 is reduced from two to one. The flow velocity of the air inside the case 12 does not decrease as compared with the case where there are two cases. Therefore, a large amount of fine particles such as mist contained in the air can be collected in a short time, and the dust collection efficiency can be improved.

(2) Electrode support plate 19 and upper and lower discharge electrodes 2
Since the electrodes 2 and 23 are constituted by a single electrode pin 21, the upper and lower discharge electrodes 22 and 23 do not have to be separately assembled to the electrode support plate 19. Therefore, the number of parts can be reduced and the number of assembling steps can be reduced. Therefore, the manufacturing cost of the electrostatic precipitator 11 can be reduced, and the size of the entire electrostatic precipitator 11 can be reduced.

(3) The electrode pin 21 is formed in a rod shape so that the axes L1 and L2 of the upper and lower discharge electrodes 22 and 23 coincide with each other. Therefore, the electrode pins 21 are connected to the electrode support plate 1.
When the electrode pin 21 is inserted into the mounting hole 19a of the
Can be easily assembled as compared with a case where the is bent.

(4) Sharp portion 22 of each discharge electrode 22, 23
a, 23a were extended to the vicinity of the inlets 13a, 20a. Therefore, the sharp portions 22a, 23a are connected to the outlets 13b, 20b.
Even if the air charged to the negative polarity exits outside each of the square pipes 13 and 20 as compared with the case where it is disposed near, it can be easily returned with the flow pressure flowing through the air flow path A. Therefore,
Air passing through the upper and lower square pipes 13 and 20 can be reliably purified.

(5) The upper square pipe 13 has a slit 16
Is formed so that mist and the like contained in the air adhere not only to the inner side surface of the upper square pipe 13 but also to the outer side surface thereof. Therefore, compared with the case where the slits 16 are not formed, the adhesion area of fine particles such as mist can be increased, and more mist or the like can be attached. Therefore, the dust collecting ability of the electrostatic precipitator 11 can be improved.

(6) A plurality of through holes 19a are formed in the electrode support plate 19.
Is formed, the air passage area can be increased as compared with the case where each through hole 19a is formed in a lattice shape. Therefore, the flow velocity of the air inside the case 12 can be further prevented from decreasing, and the dust collecting efficiency of the electrostatic precipitator 11 can be improved.

It should be noted that, in addition to the above embodiment, the following configuration may be adopted. In the above-described embodiment, air containing mist or the like as a fluid to be removed is used. However, other than this, for example, air containing smoke or dust, oil or water containing dust or the like may be purified. Good.

In the above-described embodiment, a pair of upper and lower square pipes 13 are provided on the upstream and downstream sides of the electrode support plate 19, respectively.
20 and electrode pins 21 were provided. Other than this, for example,
When the downstream side of the electrode support plate 19 is branched into the forked air flow path A, a pair of square pipes is provided in each branch path, and the electrode pins 2 on the downstream side of the electrode support plate 19 are provided.
It is also possible to make the lower part of 1 into a forked shape and loosely insert them into square pipes provided in each branch path.

In the above-described embodiment, the upper square pipe 13, the electrode support plate 19, and the lower square pipe 20 are arranged linearly along the vertical direction. It is also possible to arrange the members 13, 19, 20 in a curved manner along the air flow path A. Further, in the above-described embodiment, the air flow path A is set in the vertical direction.

In the above-described embodiment, the shape of the electrode pin 21 is a straight line in which the axes L1 and L2 of the discharge electrodes 22 and 23 coincide with each other. However, the shape may be changed to an arbitrary shape without being limited to this shape. .

In the above embodiment, the two discharge electrodes 22, 23
The sharpened portions 22a and 23a are located near the inlets 13a and 20a of the square pipes 13 and 20, respectively.
a, 20a and the outlets 13b, 20b.

In the above embodiment, the upper square pipe 13 is provided with the slit 16 as a communicating portion. However, the slit 16 may be replaced by a long hole, or a plurality of slits 16 and long holes may be formed. Good. Alternatively, other than providing the slit 16 in the upper square pipe 13, a slit may be provided in the lower square pipe 20, and the slit 16 may extend from the inlet 20 a of the lower square pipe 20 toward the outlet 20 b. Further, the slit 16 of the upper square pipe 13 provided in the above embodiment can be omitted.

[0034]

According to the first aspect of the present invention, the air flow
To prevent the flow velocity of air flowing on the road from decreasing
Therefore, dust collection efficiency can be improved. or,
A sharpened portion is formed at the tip of each discharge electrode, and the outer peripheral surface of each discharge electrode is covered with an insulator except for the sharpened portion, so that it is reliably insulated from the dust collection electrode.

[0035]

According to the invention described in claim 2 , according to claim 1
In addition to the effects of the invention described in (1), since the first and second discharge electrodes are constituted by a single electrode member, the number of parts can be reduced. Therefore, the manufacturing cost of the electrostatic precipitator can be reduced.

According to the invention described in claim 3 , according to claim 1
Or, in addition to the effect of the invention according to claim 2 , since the tips of the first and second discharge electrodes extend near the inlet of the fluid to be removed formed in each dust collection electrode, the discharge of the discharge electrodes Even if the charged fluid to be removed comes out of the dust collecting electrode, it is easy to return to the inside of the dust collecting electrode. Therefore, fine particles in the fluid to be removed can be reliably collected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electrostatic precipitator according to one embodiment.

FIG. 2 is a plan view showing an upper corner pipe of one embodiment.

FIG. 3 is a plan view showing a lower square pipe according to one embodiment.

FIG. 4 is an enlarged sectional view showing the electrostatic precipitator of one embodiment.

FIG. 5 is a perspective view showing an electrode pin and an electrode support plate in one embodiment.

FIG. 6 is a schematic explanatory view showing a conventional electrostatic precipitator.

[Explanation of symbols]

13: Upper square pipe (dust collecting electrode), 13a: Inlet, 13
b: outlet, 16: slit (communication part), 19: electrode support plate (support member), 20: lower square pipe (dust collection electrode), 2
0a: inlet, 20b: outlet, 22: upper discharge electrode (first discharge electrode), 21: electrode pin (electrode member), 23: lower discharge electrode (second discharge electrode), L1, L2: axis .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B03C 3/60 B03C 3/60

Claims (3)

(57) [Claims] 1. A discharge electrode is provided in a cylindrical collection electrode, and a voltage is applied to the collection electrode and the discharge electrode to generate a DC electric field between the two electrodes, and the DC electric field circulates through the collection electrode. to the electrostatic precipitator to the fine particles of the dust in the fluid are adhered to the dust collecting electrode, wherein the flow path of the dust fluid provided a single supporting member, on the upstream side of definitive to the support member, which on the upstream side double in
A plurality of first discharge electrodes for the combined dust collection electrodes;
Connect each base end, and on the downstream side,
Double to multiple combined dust collection electrode on the downstream side of
A number of the second discharge electrodes are connected to their respective base ends, a sharp portion is formed at the tip of each discharge electrode, and the outer peripheral surface of each discharge electrode is covered with an insulator except for the respective sharp portions. Dust collector. 2. The electrostatic precipitator according to claim 1 , wherein the first and second discharge electrodes are formed of a single electrode member. 3. A tip of the first and second discharge electrodes is
Dust removal flow formed on the dust collection electrode corresponding to each discharge electrode
The electrostatic precipitator of claim 1 or 2 which is extended in the vicinity of inlet of the body.