JP3603584B2 - Electric dust collector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric precipitator installed in a tunnel of a motorway to purify contaminated air in the tunnel.
[0002]
[Prior art]
As an electrical precipitator for tunnels, a configuration as shown in FIG. 4 is known. In FIG. 4, reference numeral 1 denotes a housing of an electric dust collector having a suction grill 1a at a lower front portion and a discharge grill 1b at an upper front portion, 2 a blower, 3 a dust collecting unit, 4 a charging unit, and 5 an air damper. Numeral 6 denotes a cleaning pipe of each unit, and the blower 2, the dust collecting unit 3 and the charging unit 4 are arranged side by side along a ventilation path inside the housing. Although not shown, a high-voltage DC power supply for applying a voltage to the dust collecting unit 3 and the charging unit 4 and an operation control unit are also incorporated in the housing 1.
[0003]
Here, the configuration of the charging unit 4 is shown in FIGS. 5 (a) and 5 (b). In the drawing, 41 is a frame (outer frame), 42 is a flat ground electrode, 43 is a discharge wire (0.22-0.26 mmφ tungsten wire), 44 is a support rod of the electrode 42, and 45 is an insulator 46 A discharge wire support rod 47 supported by the support rod 45 is a discharge wire fixing bracket attached to the support rod 45, and the electrode plates 42 and the discharge wires 43 are alternately arranged at intervals of about 20 mm. Further, the discharge wire 43 is formed as a set of two strips, and both ends thereof are bridged between the above-described discharge wire fixing brackets 47, and are stretched while tension is applied to the wire. Reference numeral 7 denotes a high-voltage DC power supply that applies a voltage to the discharge line 42.
[0004]
On the other hand, as is well known, the dust collecting unit 3 has a configuration in which flat high-voltage plates and ground electrodes are alternately arranged in parallel.
In the electric dust collector having the above configuration, the air to be treated sucked from the tunnel side through the suction grill 1a of the casing 1 flows through the charging unit 4 and the dust collection unit 3 from below to be cleaned, and then the blower 2, The water is discharged into the tunnel through the discharge grill 1b. Here, in the charging unit 4, a high DC voltage (for example, DC 11 kV) is applied to the discharge line 43, and soot particles (dust) in the air to be processed flowing therethrough by corona discharge generated around the discharge line. To charge. In order to increase the charging capacity of the charging unit 4 in the tunnel dust collector having a large processing air flow, the discharge wires 43 are provided as a pair and are laid between each electrode plate as a standard specification. . On the other hand, in the dust collecting unit 3, a high DC voltage (for example, 5.5 kV DC) is applied to the high voltage electrode plate to form an electric field between the high voltage electrode plate and the ground electrode plate, and the dust is charged in the process of passing through the charging unit 4. Dust is attracted by Coulomb force and collected by the ground plate.
[0005]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional electric precipitator for tunnel, when the discharge wire 43 of the charging unit 4 is disconnected, the following problems occur.
That is, the discharge wire 43, which is a tungsten wire having a wire diameter of about 0.2 mm, is unexpectedly disconnected during operation due to deterioration over time due to long-term use, or sparks between the discharge wire and dust attached to the electrode plate 42. Sometimes. In this case, as shown in FIG. 4, in the electric precipitator having a configuration in which the airflow inlet of the charging unit 4 is downwardly installed in the housing 1, one end of the disconnected discharge wire 43 is connected to the discharge wire fixing bracket 47. If it hangs down while stopped, the hanging discharge wire 43 will touch the ground electrode plate 42 or the frame 41, etc., causing a spark. As a result, the high voltage power supply 7 will be short-circuited and the electric dust collector will stop abnormally. It progresses to a situation.
[0006]
In this case, if the disconnected discharge wire 43 is completely separated from the discharge wire fixing bracket 47, no voltage is applied, and even if the disconnected discharge wire touches the electrode plate, the frame, or the like, there is a possibility that an abnormality such as a spark may occur. Disappears. Therefore, various measures have been proposed for the mounting structure of the discharge wire, but with the conventional mounting structure, the detachment operation of the disconnected discharge wire is incomplete or the structure becomes complicated, so that it is practically sufficient. At present, there is nothing that can meet the high reliability.
[0007]
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. An object of the present invention is to provide a highly reliable electric precipitator that avoids occurrence of abnormalities.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a blower, a dust collecting unit, and a charging unit are vertically arranged in a housing, and air to be processed sucked from a lower front surface of the housing is charged into the charging unit. An electric precipitator which sends the dust to a dust collecting unit, removes dust, and discharges the dust to the outside from the upper part of the housing, wherein the charging unit is arranged in parallel with the lower surface as an air flow inlet; And a pair of high-voltage discharge wires laid between the electrode plates by bridging between a pair of discharge wire support shafts arranged at the left and right ends of the left and right ends. Discharge wire fixing brackets are installed on the support shaft so that they can be dropped by their own weight. One discharge wire is stretched in a loop between the left and right support shafts via the discharge wire fixing bracket, and the tension of the discharge wire is set. It holds the discharge wire mounting brackets to the support shaft and (claim 1) ones, specifically configured in the manner as follows follow.
[0009]
(1) The discharge wire fixing bracket itself is a clip-shaped metal fitting that is detachably mounted on the discharge wire support shaft by its own weight, and is looped over a support pin implanted on a side surface of the fixing bracket. (Claim 2).
(2) As for the discharge wire, one wire is connected between both ends thereof in a loop via a tension spring.
[0010]
According to such a configuration, the discharge wire stretched in a loop over the pair of right and left fixing brackets always functions as two discharge wires, and the discharge wire fixing bracket is formed using the tension of the discharge wire. It is locked and held at a fixed position so as not to fall off with respect to the support shaft. On the other hand, if the discharge wire of the charging unit breaks at one point on the loop during operation, the discharge wire will fall off the fixture by its own weight and fall downward, and the discharge wire will loosen and become fixed. Is lost, and the fixture is detached from the support shaft and falls downward by its own weight together with the disconnected discharge wire. As a result, no voltage is applied to the discharge wire and the discharge wire fixing bracket, and the occurrence of a high-voltage abnormality such as a spark caused by contact with the ground plate and the frame is avoided.
[0011]
According to the present invention, as the discharge line supporting structure of the charging unit, the support shaft is disposed in a downward position, and the discharge line fixing bracket is mounted on each support shaft so as to be detachable by its own weight. At least one discharge wire fixing bracket of the fixing bracket is attached with a bifurcated discharge wire support piece pivotally supported on the side surface thereof, and the other end of the support piece is provided with a bifurcated tip via a tension spring. There is a configuration in which two discharge wires are individually stretched between the fixture and the fixture, and the discharge wire fixture is held on the support shaft by the tension of the discharge wire.
[0012]
According to this configuration, the bifurcated discharge wire support piece is normally pulled by the two discharge wires and is held in the horizontal position, and the discharge wire fixing bracket is also pulled by the tension spring and held by the support shaft. . Here, during operation, if one of the two discharge wires stretched between the left and right discharge wire support shafts breaks, the balance of the discharge wire tension applied to the forked discharge wire support piece is reduced. It collapses and oscillates around its fulcrum, and along with this movement, the broken discharge wire and sound discharge wire come out of the tip of the support piece and separate, and the discharge wire tensions the support shaft. The holding force of the fixed metal fittings that have been supported is also lost, and as a result, the left and right fixed metal fittings are separated from the support shaft and fall down with their own weight together with the discharge wires.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on the illustrated examples. In the drawings of the respective embodiments, the same members corresponding to FIG. 5 are denoted by the same reference numerals.
[Example 1]
FIGS. 1A to 1C show an embodiment corresponding to claims 1 to 3 of the present invention. In this embodiment, the discharge wires 43 are laid on the pair of left and right discharge wire support rods 45 incorporated in the charging unit 4 as follows. That is, on the axis of the discharge wire support rod 45, a plate-shaped discharge wire support shaft 48 is attached in a downward position so as to protrude between the ground electrode plates 42, and the discharge wire loaded at the tip of each support shaft 48. One discharge wire 43 is stretched in a loop shape via a fixing bracket 47. Thus, the discharge wire 43 bridged between the left and right support shafts 48 is one, but the upper and lower sides of the loop of the discharge wire 43 function as two discharge wires with respect to the ground plate 42. Will do.
[0014]
Here, both ends of one wire of the discharge wire 43 are connected in a loop via a tension spring 49. On the other hand, as shown in FIGS. 1 (b) and 1 (c), the discharge wire fixing bracket 47 has a base plate 47a having a two-fold structure in which a support shaft 48 is held from the outside, and a base plate 47a on the folded side. The structure includes a laterally engaging sleeve 47b welded to the center of the side edge, and discharge wire support pins 47c implanted at three locations including the upper and lower locations of the sleeve 47b and the base plate 47a. Note that the fixing bracket 47 is formed in a shape in which the right side and the left side are opposite. An arc-shaped shallow engaging concave groove 48a is formed on the outer edge of the support shaft 48 so as to face the engaging sleeve 47b of the fixing bracket 47.
[0015]
In this configuration, when the discharge wire 43 is stretched over the charging unit 4, first, the discharge wire 43 connected in a loop is straddled between the left and right fixing brackets 47 and the outer periphery of the three discharge wire support pins 47. Hang on the side. Next, after the base plate 47a of the fixing bracket 47 is fitted into the left and right support shafts 48, the engagement sleeve 47b is engaged with the engagement groove 48a of the support shaft 48 and latched at a fixed position. In this discharge wire mounted state, tension is applied to the discharge wire 43 by the tension spring force of the tension spring 49, and the left and right fixing brackets 47 receiving this tension are engaged and held by the support shaft 48. Even if the fixing bracket 47 is to be loaded on the support shaft 48 alone, the fixing bracket 47 falls off from the support shaft 48 by its own weight.
[0016]
Next, the operation when the discharge wire 43 is disconnected during the operation of the electric precipitator in the above-described structure for mounting the discharge wire will be described with reference to FIGS.
That is, when the loop-shaped discharge wire 43 is broken at the point P in the stretched state shown in FIG. 2A, the discharge wire 43 spreads right and left at the break point, and the weight of the tension spring 49 is added to the discharge wire 43 to lower the wire. It starts to slide down (FIG. 2 (b)). At the same time, the engagement holding force due to the tension of the discharge wire applied to the fixture 47 is lost, whereby the fixture 47 falls off the support shaft 48 (FIG. 2 (c)) and is released as shown in FIG. 2 (d). It comes out of the charging unit 4 together with the electric wire 43 and falls by its own weight.
[0017]
As a result, no voltage is applied to the discharge wire 43 and the fixing bracket 47, and even if the discharge wire 43 and the fixing bracket 47 come into contact with the electrode plate 42 or the frame 41 while falling, a high-voltage abnormality such as a spark may occur. Absent. In addition, when replacing the disconnected discharge wire 43 with a new discharge wire, the operation of the electric dust collector is stopped, and the replacement is performed according to the above-described procedure.
[0018]
[Example 2]
Next, an embodiment corresponding to claim 4 of the present invention is shown in FIGS. In this embodiment, two discharge wires 43 are stretched in parallel with a discharge wire support shaft 48 connected to the left and right discharge wire support rods 45 and extending downward through a discharge wire fixing bracket 47. ing. Here, similarly to the first embodiment, the fixing bracket 47 basically has a structure in which the support shuff 48 is held and supported from the outside by the two-folded base plate 47a. As for the right fixing bracket, a bifurcated discharge wire support piece 47d is pivotally supported (360 ° rotatable) on an engagement sleeve 47b provided on the base plate 47a. On the other hand, the right fixing bracket has a discharge wire locking portion 47e formed on the inner side edge of the base plate 47a. In order to stretch the two discharge wires 43 between the left and right fixing brackets 47, the right end of the discharge wire 43 is hooked on the locking portion 47e, and the left end is bifurcated via the tension spring 49 as shown in the figure. Hook on the tip of the support 47d.
[0019]
In this stretched state, tension is applied to the two discharge wires 43 by the spring force of the tension spring 49, and the left and right fixing brackets 47 are drawn inward and are engaged and held by the support shaft 48. Further, the bifurcated discharge wire supporting piece 47d is maintained in a horizontal posture as shown in the drawing by the same pulling force acting on the bifurcated tip.
Here, when one of the two discharge wires 43, for example, the upper discharge wire is broken, the tension balance is lost and the discharge wire support piece 47d swings counterclockwise to be coupled to the lower healthy discharge wire. The tension spring 49 escapes from the tip of the support piece 47d and separates. At the same time, the engagement holding force (inward pulling force) that has been applied to the left and right fixing brackets 47 is lost, whereby the fixing bracket 47 falls off the support shaft 48 as in the first embodiment, and the discharge wires 43 and The weight falls together with the tension spring 49 from the charging unit 4 downward. When the lower discharge wire is broken, the bifurcated discharge wire support piece 47d swings clockwise, and the tension spring 49 connected to the upper healthy discharge wire 43 moves from the discharge wire support piece 47d. As a result, the discharge wire 43 drops downward from the charging unit 4 together with the fixture 47 in the same manner as described above.
[0020]
【The invention's effect】
As described above, according to the present invention, when the discharge wire incorporated in the charging unit breaks unexpectedly during the operation of the electrostatic precipitator, the broken discharge wire is subjected to high voltage together with the discharge wire fixing bracket. It can be immediately detached from the discharge wire support shaft connected to the power supply, and can be reliably dropped by its own weight below the charging unit. This eliminates the application of voltage to the discharge wire and the fixing bracket that fall by their own weight. Thus, the emergency stoppage of the electric precipitator can be avoided, and the reliability in maintenance can be improved.
[Brief description of the drawings]
FIGS. 1A and 1B are configuration diagrams of an embodiment corresponding to Embodiment 1 of the present invention, in which FIG. 1A is a longitudinal side view showing an internal structure of a charging unit, and FIG. 1B is a discharge wire fixing bracket in FIG. Exploded perspective view of a discharge wire support shaft, FIG. 2C is a plan view of a discharge wire fixing bracket. FIG. 2 is an explanatory view of a drop operation when the discharge wire is disconnected according to the embodiment of FIG. FIG. 3D is a diagram showing each state of the operation progress. FIG. 3 is a configuration diagram of an embodiment corresponding to the second embodiment of the present invention. FIG. b) is an exploded perspective view of the discharge wire fixing bracket and the discharge wire support shaft in FIG. FIGS. 3A and 3B are structural views of a charging unit in FIG. Description of the code]
REFERENCE SIGNS LIST 1 housing of electric dust collector 2 blower 3 dust collecting unit 4 charging unit 41 frame 42 electrode plate 43 discharge wire 45 discharge wire support rod 47 discharge wire fixing bracket 47a base plate 47b engagement sleeve 47c discharge wire support pin 47d Bifurcated discharge wire support piece 48 Discharge wire support shaft 49 Tension spring

Claims (4)

A blower, a dust collection unit, and a charging unit are vertically arranged inside the housing, and the air to be processed sucked from the lower front of the housing is sent to the charging unit and the dust collection unit to remove dust, and then the housing is removed. An electrostatic precipitator that is discharged from the upper part of the body to the outside, wherein the charging unit is disposed between an electrode plate in which a lower surface is arranged in parallel as an air flow inlet and a pair of discharge wire support shafts disposed at left and right ends of the unit. And a pair of high-pressure discharge wires laid between the electrode plates and laid between the pole plates, wherein the support shafts are disposed in a downward position, and the discharge wires are fixed to the left and right support shafts so as to be detachable by their own weights. A metal fitting is provided, one discharge wire is stretched in a loop between the left and right support shafts via a discharge wire fixing metal, and the discharge wire fixing metal is held on the support shaft by the tension of the discharge wire. Electrostatic precipitator which is characterized. 2. The electric dust collector according to claim 1, wherein the discharge wire fixing bracket is a clip-shaped metal fitting that is detachably loaded on the discharge wire support shaft by its own weight, and is wound around a support pin implanted on a side surface of the fixing metal. An electric precipitator, wherein a discharge wire is stretched in a loop. 3. The electrostatic precipitator according to claim 1, wherein the discharge wire is formed by connecting one wire in a loop between both ends thereof via a tension spring. A blower, a dust collection unit, and a charging unit are vertically arranged inside the housing, and the air to be processed sucked from the lower front of the housing is sent to the charging unit and the dust collection unit to remove dust, and then the housing is removed. An electrostatic precipitator that is discharged from the upper part of the body to the outside, wherein the charging unit is disposed between an electrode plate in which a lower surface is arranged in parallel as an air flow inlet and a pair of discharge wire support shafts disposed at left and right ends of the unit. And a pair of high-pressure discharge wires laid between the electrode plates, and the support shafts are arranged in a downward position, and the discharge wire fixing brackets are detachably mounted on each support shaft by its own weight. At the same time, for at least one of the left and right discharge wire fixing brackets, a bifurcated discharge wire support piece pivotally supported on the side surface is attached to the side surface thereof, and the bifurcated tip of the support piece is attached to the bifurcated tip of the support piece. An electric machine characterized in that two discharge wires are individually stretched between the other fixture and the other fixture via tension springs, respectively, and the discharge wire fixture is held on a support shaft by the tension of the discharge wire. Dust collector.

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