JP4200671B2 - Dust collector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust collector, and more particularly to a bag filter type dust collector that filters dust in combustion exhaust gas.
[0002]
[Prior art]
In the bag filter type dust collector, a plurality of filter members each having a filter cloth arranged in a cylindrical shape are arranged in parallel, and the combustion exhaust gas is passed from the outside to the inside of the filter member for filtration. The dust contained in the exhaust gas is collected by the filter cloth of the filter member and is deposited on the outer surface of the filter cloth. The accumulated dust is periodically removed by a removal device.
[0003]
An example of the payout device is a pulse jet type. In the pulse jet type wipe-out device, a venturi tube and a nozzle are disposed at an end of a filter member, and compressed air is injected from the nozzle into the filter member at regular intervals. Thereby, a filter member deform | transforms and dust is wiped off with the shearing force by the deformation | transformation.
[0004]
In the conventional dust collector, a venturi tube and a nozzle are arranged at the end of all the filter members. For this reason, the venturi tube and the nozzle get in the way when the filter member is replaced, and the working efficiency is deteriorated. Further, since the venturi tube has only about half the inner diameter as compared with the filter member, there is a problem that the pressure loss becomes large during the filtration operation.
[0005]
As a dust collector that solves this problem, Japanese Patent Application Laid-Open No. 5-305210 describes a dust collector that moves a venturi tube. In this dust collector, as shown in FIG. 11, a venturi pipe 1 is attached to a belt 2, and the belt 2 is caused to travel by a motor (not shown) so that the venturi pipe 1 is moved to a plurality of filter members 3, Move between. Therefore, since the number of the venturi pipes 1 can be smaller than the number of the filter members 3, the pressure loss can be reduced.
[0006]
[Problems to be solved by the invention]
However, since the dust collector shown in FIG. 11 has a gap D between the venturi tube 1 and the end of the filter member 3, the compressed gas injected from the nozzle 4 leaks from the gap D and is caused by the compressed gas. There was a problem that the dust removal performance deteriorated.
[0007]
In order to solve this problem, the gap D may be set to zero. However, when the gap D is set to zero, there is a problem that when the venturi pipe 1 is moved, friction increases or pipes are caught.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dust collector capable of smoothly moving a venturi tube and improving dust removal performance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of bag-like filter members having one end opened in parallel, and allows dust-containing gas to pass from the outside to the inside of the plurality of filter members. And collecting the collected dust by injecting air into the inside of the filter member to remove the air from the opening of the filter member through the venturi tube to the inside of the filter member. Injecting means for injecting, moving arrangement means for moving the venturi pipe between the plurality of filter members and arranging the venturi pipe in any one of the plurality of filter members, and the venturi pipe for arranging in the opening of the filter member To move to the filter member side, and when moving between the filter members, the Venturi tube from the filter member And moving means for avoided, it is characterized by comprising a.
[0010]
According to the present invention, since the venturi tube is advanced to the filter member side and arranged at the opening of the filter member, the gap between the arranged venturi tube and the filter member is reduced. In particular, if the venturi tube is brought into contact with the filter member, the gap can be eliminated. Accordingly, it is possible to increase the flow rate of the air injected from the injection unit into the filter member, and it is possible to improve dust removal efficiency.
[0011]
Further, according to the present invention, since the venturi tube moves backward from the filter member, the moving venturi tube does not contact the filter member or the like. Therefore, the venturi tube can be smoothly moved between the plurality of filter members.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a dust collector according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a perspective view showing the overall configuration of a dust collector according to the present invention.
[0014]
As shown in FIG. 1, the dust collector 10 has a casing 12, and an inlet duct 14 is communicated with the central portion of the side surface of the casing 12. In addition, an outlet duct 16 is communicated with an upper part of the side surface opposite to the inlet duct 14. The outlet duct 16 is connected to a fan (not shown). By driving this fan, combustion exhaust gas is introduced into the casing 12 from the inlet duct 14 and discharged from the outlet duct 16.
[0015]
A partition plate 18 is horizontally disposed inside the casing 12, and the interior of the casing 12 is partitioned by the partition plate 18 into the inlet duct 14 side and the outlet duct 16 side. A number of holes 20, 20,... Are formed in the partition plate 18, and the filter members 22, 22,.
[0016]
The filter member 22 is formed in a cylindrical shape by a filter cloth. The lower end of the filter member 22 is closed, and the upper end of the filter member 22 is opened and attached to the partition plate 18 so as to face the hole 20. Therefore, the exhaust gas introduced into the casing 12 from the inlet duct 14 enters the inside from the outside of the filter member 22, passes through the hole 20, and is discharged from the outlet duct 16. At that time, dust in the exhaust gas is collected by the filter cloth of the filter member 22. When the collected dust is removed from the filter cloth, it accumulates on the hopper 12 </ b> A at the bottom of the casing 12. In addition, the code | symbol 24 of FIG. 1 is a baffle plate, and the exhaust gas which flowed in from the inlet duct 14 does not hit the filter member 22 directly.
[0017]
FIG. 2 is a perspective view showing the upper surface of the partition plate 18.
[0018]
As shown in the figure, the numerous holes 20, 20,... Of the partition plate 18 are formed in a state of being aligned vertically and horizontally. That is, the holes 20 are formed in a line in the X axis direction at equal intervals, and a plurality of the holes 20 are formed in parallel in the Y axis direction orthogonal to the X axis at a constant interval.
[0019]
A movable carriage 26 is placed on the partition plate 18. The moving carriage 26 is arranged in the row direction of the holes 20 (X-axis direction), and traveling wheels 28, 28,... Are rotatably supported at both ends thereof. The traveling wheel 28 is guided by a guide rail 30 disposed in the Y-axis direction and travels along the guide rail 30.
[0020]
The movable carriage 26 is connected to endless drive chains 32 and 32. The drive chain 32 is wound around a pair of pulleys (not shown), and rotates around the pulleys by a motor 36 to travel around. As a result, the movable carriage 26 moves in a direction orthogonal to the row of holes 20 (Y-axis direction).
[0021]
A plurality of venturi tubes 34 are supported on the movable carriage 26. As shown in FIGS. 3 and 4, the Venturi tube 34 is a tube with a narrowed lower portion, and the inner diameter of the lower portion is formed, for example, approximately half the inner diameter of the filter member 22. The venturi tube 34 is supported by the movable carriage 26 so as to be slidable in the vertical direction. Further, the respective venturi tubes 34 are arranged at an interval equal to the interval between the holes 20 in the X-axis direction. Therefore, by running the movable carriage 26, each Venturi tube 34 can be disposed above the hole 20, that is, at the opening position of the filter member 22.
[0022]
An air jet pipe 38 is disposed above the venturi pipe 34. The air jet pipe 38 is supported by the moving carriage 26 and moves together with the moving carriage 26. The air jet pipe 38 communicates with an air tank (not shown) via an air pipe 40 shown in FIG. 2, and air is supplied from the air tank via the air pipe 40. A plurality of nozzles 42, 42,... Are arranged vertically downward at the lower portion of the air jet pipe 38, and the air supplied from the air tank is jetted toward each venturi pipe 34.
[0023]
A pedestal member 44 of the venturi tube 34 is disposed above the movable carriage 26. Holes 44A, 44A,... Smaller than the upper end of the venturi tube 34 are formed in the base member 44, and the venturi tube 34 is engaged with and supported by the holes 44A.
[0024]
Wheels 46 and 46 are rotatably supported at both ends (only one end is shown) of the base member 44. The wheel 46 is placed on the rail 48 and travels along the rail 48. The rail 48 is stretched across the inner surface of the casing 12 in the Y-axis direction and horizontally. Therefore, when the movable carriage 26 is caused to travel and the venturi tube 34 is moved in the Y-axis direction, the pedestal member 44 engages with the venturi tube 34 and moves in the Y-axis direction.
[0025]
As shown in FIG. 4, the wheel 46 is formed in an elliptical shape. Therefore, when the wheel 46 is rotated on the horizontal rail 48, the base member 44 moves in the Y-axis direction while moving up and down. Therefore, the venturi tube 34 engaged and supported by the base member 44 also moves in the Y-axis direction while moving up and down. The wheel 46 is disposed such that the short diameter portion is in contact with the rail 48 when the venturi tube 34 is disposed at the opening position of the filter member 22 (that is, the position above the hole 20).
[0026]
A donut-shaped cover 34 </ b> A protruding in the outer peripheral direction is provided at the lower end of the venturi tube 34. The cover 34 </ b> A contacts the partition plate 18 when the pedestal member 44 is positioned at the lowest position. Further, the lower end of the venturi tube 34 moves upward from the partition plate 18 by raising the pedestal member 44.
[0027]
Next, the operation of the dust collector 10 configured as described above will be described.
[0028]
The exhaust gas containing dust is introduced into the casing 12 from the inlet duct 14 of FIG. The introduced exhaust gas passes from the outside to the inside by passing through the filter cloth of the filter member 22, and dust in the exhaust gas is collected on the filter cloth of the filter member 22 at that time. The exhaust gas in which the dust is collected is discharged from the inside of the filter member 22 through the hole 20 to the outlet duct 16.
[0029]
The dust accumulated on the filter cloth surface of the filter member 22 is periodically wiped off by jetting compressed air from the nozzle 42 in FIG. The dust removal operation is performed for each row of the filter members 22. Hereinafter, dust removal work will be described.
[0030]
First, the movable carriage 26 is moved by driving the motor 36 in FIG. 2, and the venturi tube 34 and the nozzle 42 are arranged in the opening of the filter member 22 in the row to be operated. Next, compressed air is injected from each nozzle 42, and the compressed air is supplied to the inside of the filter member 22 through the venturi pipe 34. When compressed air is supplied to the inside of the filter member 22, the filter cloth of the filter member 22 is deformed with respect to the time of filtration, so that dust on the filter cloth surface can be removed. Thereby, the dust removal operation for one row of the filter members 22 is completed. Then, by moving the venturi tube 34 and the nozzle 42 and sequentially arranging them at the openings of the filter members 22 and injecting air, dust can be removed from all the filter members 22.
[0031]
By the way, when the venturi tube 34 is moved in the Y-axis direction by the moving carriage 26, the pedestal member 44 engaged with the venturi tube 34 is also moved in the Y-axis direction. At this time, since the wheel 46 is formed in an elliptical shape, the pedestal member 44 moves in the Y-axis direction while moving up and down. Therefore, the venturi tube 34 engaged and supported by the base member 44 also moves in the Y-axis direction while moving up and down.
[0032]
For example, FIG. 5A shows a state in which the wheel 46 is in contact with the rail 48 at the long diameter portion. Accordingly, the pedestal member 44 and the venturi tube 34 are disposed at the uppermost position, and a gap is formed between the lower end of the venturi tube 34 and the partition plate 18. Thereby, the venturi tube 34 can be moved safely and smoothly without being caught on the partition plate 18 or the filter member 22.
[0033]
When the venturi tube 34 is moved in the horizontal direction from the state of FIG. 5A, the distance between the rotation center 46A of the wheel 46 and the rail 48 is gradually reduced, so that the base member 44 and the venturi tube 34 are gradually lowered. To do.
[0034]
Then, as shown in FIG. 5B, when the short diameter portion of the wheel 46 is in contact with the rail 48, the venturi tube 34 is disposed at the opening of the filter member 22. At this time, the pedestal member 44 is positioned at the lowest position, the cover 34A of the venturi tube 34 abuts against the partition plate 18, and the lower end of the venturi tube 34 is inserted into the hole 20. Accordingly, there is no gap between the venturi tube 34 and the filter member 22, and thus when the compressed air is injected from the nozzle 42, the internal pressure of the filter member 22 greatly increases.
[0035]
FIG. 6 shows the result of experimental determination of the effect of the gap distance on the internal pressure of the filter member 22. As a result, in the experimental apparatus shown in FIG. 7, a constant flow rate of compressed air is injected from the nozzle 42, and the internal pressure of the filter member 22 is changed to a pressure measuring device 50 while changing the gap d between the venturi tube 34 and the filter member 22. It was measured by.
[0036]
As can be seen from FIG. 6, as the gap d between the venturi tube 34 and the filter member 22 is reduced, the internal pressure of the filter member 22 rapidly increases. For example, when the gap d, which was 100 mm, is made zero, the internal pressure of the filter member 22 increases 10 times or more. Therefore, the present embodiment without the gap d can increase the internal pressure of the filter member 22 as compared with the conventional apparatus in which the gap d exists. As the internal pressure of the filter member 22 increases, the deformation of the filter cloth of the filter member 22 also increases, so that the effect of removing dust attached to the filter member 22 is also improved.
[0037]
Thus, since the dust collector 10 has no gap between the cover 34A and the partition plate 18 when the venturi tube 34 is disposed in the opening of the filter member 22, the dust collecting effect by compressed air can be improved. it can.
[0038]
After the dust removal operation is completed, the venturi tube 34 and the nozzle 42 are moved between the filter members 22 and 22 by causing the movable carriage 26 to travel. At this time, the pedestal member 44 supporting the elliptical wheel 46 moves in the Y-axis direction while being lifted to lift the venturi tube 34. Therefore, the moving venturi tube 34 is lifted on the partition plate 18 and moves away from the partition plate 18. Thereby, it can prevent that the moving venturi pipe 34 contact | abuts to the partition plate 18 and the filter member 22, and can move the venturi pipe 34 smoothly.
[0039]
Further, the dust collector 10 of the present embodiment can move the venturi pipe 34 and the nozzle 42 from the opening of the filter member 22 to be replaced when the filter member 22 is exchanged. The nozzle 42 is not in the way, and the replacement work can be performed quickly.
[0040]
Moreover, since the venturi tube 34 and the nozzle 42 are not disposed above the filter member 22 during filtration, pressure loss can be reduced.
[0041]
Furthermore, the dust collector 10 of this embodiment has a simple structure in which an elliptical wheel 46 is attached to the base member 44 of the venturi tube 34, and is low in cost.
[0042]
In the above-described embodiment, the wheel 46 is formed in an elliptical shape, but may be any non-circular shape with respect to the rotation center 46A. That is, it is not necessary to have a circular shape centered on the rotation center 46A. For example, as shown in FIG. 8, the wheel 52 which cut out a part of circular shape may be sufficient. In this case, the venturi tube 34 is arranged at the opening of the filter member 22 when the notch 52 </ b> A of the wheel 52 contacts the rail 48.
[0043]
Further, as shown in FIG. 9, a circular wheel 54 may be rotatably supported at an eccentric position 54A. Even when this wheel 54 is rotated, the pedestal member 44 moves up and down, so that the same effect as the above-described embodiment can be obtained.
[0044]
In the above-described embodiment, the wheels 46, 52, 54 may be configured not to slide with respect to the rail 48. For example, the friction between the wheels 46, 52, 54 and the rail 48 may be increased by providing a rubber member (not shown) on the outer peripheral surface of the wheels 46, 52, 54 or the upper surface of the rail 48. Further, a rack and a pinion may be formed on the rail 48 and the wheels 46, 52, 54. As a result, the positions of the wheels 46, 52, 54 do not shift with respect to the rail 48, so that when the venturi tube 34 is disposed at the opening of the filter member 22, it can be reliably disposed at the lowest position.
[0045]
In the above-described embodiment, the wheels 46, 52, and 54 are non-circular with respect to the rotation center so that the base member 44 travels in the Y-axis direction while moving up and down. The base member 44 may be moved up and down by changing the shape. For example, as shown in FIG. 10, the rail 56 is formed in a waveform and the wheel 58 is formed in a circular shape. In this case, by forming the shape of the rail 56 so that the pedestal member 44 is disposed at the lowest position when the venturi tube 34 is disposed at the opening of the filter member 22, the same as in the above-described embodiment. An effect can be obtained.
[0046]
Further, in the above-described embodiment, the venturi pipe 34 is moved up and down by moving the pedestal member 44 up and down. However, the present invention is not limited to this. For example, the venturi tube 34 may be fixed to the moving carriage 26 and the traveling wheels 28 of the moving carriage 26 may be formed in a non-circular shape. Alternatively, the Venturi tube 34 may be fixed to the moving carriage 26, the traveling wheel 28 of the moving carriage 26 may be circular, and the guide rail 30 for the traveling wheel 28 may be formed in a non-linear shape.
[0047]
FIG. 12 is a side view showing a modification of the lower end of the venturi tube according to the present invention. A collar 34C is provided on the outer periphery of a donut-shaped cover 34B provided at the lower end of the venturi tube 34, and a skirt-shaped soft sealing material 60 is attached to the collar 34C. As the sealing material 60, for example, a soft rubber sheet wound in a ring shape is used. In this modification, when the venturi tube 34 is positioned immediately above the filter member 22, the lower end of the sealing material 60 is pressed against the partition plate 18 as shown on the left side of FIG. The cover 34B is located above the partition plate 18. Further, when the venturi tube 34 is moved from a position immediately above the filter member 22, the lower end of the sealing material 60 is separated from the partition plate 18 as shown on the right side of FIG.
[0048]
According to this modified example, when the venturi tube 34 approaches the filter member 22, the lower end of the sealing material 60 is slightly bent and softly contacts the partition plate 18, so that the cover 34B and the filter member 22 are in direct metal contact. Compared with the case of making it possible, it is possible to ensure a precise and smooth airtightness, and to avoid troubles of wear and damage due to metal contact.
[0049]
In the above modification, the skirt-shaped soft sealing material 60 is attached to the collar 34C. However, the same effect can be obtained by attaching a soft sealing material to the lower surface of the cover 34B instead of this configuration.
[0050]
【The invention's effect】
As described above, according to the dust collector according to the present invention, since the venturi pipe is advanced to the filter member side and disposed at the opening of the filter member, the gap between the venturi pipe and the filter member is reduced, It is possible to improve the payout efficiency. Further, according to the present invention, since the venturi tube is moved backward from the filter member, the venturi tube can be smoothly moved between the plurality of filter members.
[Brief description of the drawings]
1 is a perspective view showing an overall configuration of a dust collector according to the present invention. FIG. 2 is a perspective view showing an upper surface of a partition plate shown in FIG. 1. FIG. 3 is a perspective view showing a schematic structure of a moving carriage. 4 is a side view showing the schematic structure of the base member. FIG. 5 is an explanatory view for explaining the operation of the dust collector according to the present invention. FIG. 6 is a view showing the influence of the gap distance on the internal pressure of the filter member. 6 is a schematic diagram for explaining the apparatus used in the experiment. FIG. 8 is a side view showing a wheel shape different from FIG. 4. FIG. 9 is a side view showing a wheel structure different from FIG. FIG. 11 is a side view showing a member moving mechanism. FIG. 11 is a schematic view showing a conventional apparatus. FIG. 12 is a side view showing a modification of the lower end portion of the venturi pipe according to the present invention.
DESCRIPTION OF SYMBOLS 10 ... Dust collector, 12 ... Casing, 14 ... Inlet duct, 16 ... Outlet duct, 18 ... Partition plate, 20 ... Hole, 22 ... Filter member, 26 ... Moving cart, 34 ... Venturi tube, 34A ... Cover, 38 ... Air jet piping, 42 ... Nozzle, 44 ... Base member, 46 ... Wheel, 48 ... Rail, 60 ... Sealing material

Claims (5)

A plurality of bag-shaped filter members having one end opened are arranged in parallel, and dust is collected by the filter member by passing dust-containing gas from the outside to the inside of the plurality of filter members, and the collected dust In a dust collector that jets air into the filter member and wipes it off,
Injection means for injecting air into the filter member from the opening of the filter member via a venturi tube;
Moving arrangement means for moving the Venturi tube between the plurality of filter members, and disposing the venturi tube in any one of the plurality of filter members;
Advancing / retracting means for moving the venturi tube toward the filter member when the filter member is disposed in the opening of the filter member, and retracting the venturi tube from the filter member when moving between the filter members;
A dust collector characterized by comprising: The advance / retreat means comprises a pedestal member that supports the venturi tube and a wheel that is rotatably supported by the pedestal member, and the wheel is formed in a non-circular shape with respect to the center of rotation. The dust collector according to claim 1. The advancing / retreating means includes a pedestal member that supports the venturi tube, a wheel that is rotatably supported by the pedestal member, and a rail that forms a traveling track of the wheel, and the rail is formed in a non-linear shape. The dust collector according to claim 1, wherein The dust collector according to claim 1, wherein a donut-shaped cover protruding in an outer peripheral direction is provided at a lower end portion of the venturi pipe. The dust collector according to claim 4, wherein a soft sealing material is attached to a periphery or a lower surface of the cover.

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