JP2010099582A - Bag type dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag type dust collector keeping wave generated by pressurized gas propagating through a filter to the end of the filter without increasing an amount of used pressurized gas, having excellent dust removing efficiency. <P>SOLUTION: In the bag type dust collector, the inside of a casing 2 is sectioned by a sectioning wall 3, one of the sectioned parts of the casing 2 serves as a dust-containing air introducing chamber 4 and the other as a cleaned air chamber 5. A opening base end of the filter 7 disposed in the dust-containing air introducing chamber 4 is attached to a filter attaching hole formed on the sectioning wall 3, a filter cage 10 is inserted into the filter 7, and the pressurized air is jetted into the filter 7, to thereby remove the dust attached to the filter 7 by a pressurized air introducing means P disposed in the dust collector. The filter cage 10 is formed with a tapered part Ta reduced in the diameter from the opening base end of the filter 7 toward the front end. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bag type dust collector, and more particularly to an improvement of a bag type dust collector provided with a pressure gas introducing means for removing dust adhering to a filter.

In order to collect dust contained in exhaust gas discharged from an incinerator or an electric furnace, a dust collector is widely adopted.
By the way, although dust adheres to the filter used in this dust collector, when dust adheres in large quantities and the ventilation resistance (pressure loss) rises to a predetermined value or more, or after a certain period of use has elapsed. Periodically, a condition is selected to remove dust, and pressure gas (for example, compressed air) is ejected into the filter, so that dust attached to the filter is removed.

More specifically, as shown in FIG. 6, the dust collector 20 for removing dust adhering to the filter divides the inside of the housing 2 up and down by a partition wall 3 and the lower part is a dust-containing air introduction chamber. 4. The upper part is a purified air chamber 5, the dust-containing air introduction chamber 4 is connected to a dust generation source (not shown), and the purified air chamber 5 is connected to a suction device F (for example, Patent Document 1). reference).
Then, the opening base end portion of the filter 21 disposed in the dust-containing air introduction chamber 4 is attached to the filter mounting hole formed in the partition wall 3, and in order to maintain the shape of the filter in the filter 21, the cylindrical shape has a uniform diameter. The formed filter cage 22 is inserted.
Further, as the pressure gas introduction means P for discharging dust adhering to the filter 21 by ejecting the pressure gas into the filter 21, the pressure gas supply source 6 and the on-off valve V used as a pressure gas supply valve. The injector tube 8 connected via the is arranged.
Further, the injector tube 8 is provided with a nozzle hole 9 at a position facing the opening base end of the filter 21.

  The injector tube 8 has its proximal end connected to the outlet side of the on-off valve V, and is normally connected in a state of being disconnected from the pressure gas supply source 6 connected to the inlet side of the on-off valve V.

Thus, normally, the air containing dust from the dust generation source is guided to the dust-containing air introduction chamber 4 by the suction force of the suction device F connected to the downstream side of the purified air chamber 5 of the housing 2, and the dust is Filtered by the filter 21 and the purified air is discharged through the purified air chamber 5.
Then, when dust adheres to the filter 21 and the ventilation resistance reaches a predetermined value or periodically after a certain time has elapsed, the on-off valve V is opened in a short time, and the pressure gas of the pressure gas supply source 6 is instantaneously supplied. The gas was allowed to flow out into the injector tube 8, pressure gas was ejected into the filter 21 from the nozzle hole 9 provided in the injector tube 8, and the filter 21 was inflated toward the dust-containing air introduction chamber 4, thereby adhering to the filter 21. Dust is removed (see, for example, Patent Document 2).

JP 2007-175635 A JP 2004-351323 A

By the way, the pressure gas ejected into the filter 21 from the nozzle hole 9 provided in the injector tube 8 flows in the filter 21 toward the front end side of the filter 21, and the pressure gas flows from the filter 21 to the dust-containing air introduction chamber. At the time of escape to the fourth side, the kinetic energy of the pressure gas is converted into wave energy for dust removal, and propagates through the filter 21 like a wave from the opening proximal end side of the filter 21 toward the distal end side.
As a result, the filter 21 swells sequentially toward the dust-containing air introduction chamber 4 from the opening proximal end side toward the distal end side, and dust attached to the filter 21 is removed.
However, in the conventional bug type dust collector, the filter 21 has a cylindrical shape with a uniform diameter, and for the filter inserted into the filter 21 in order to maintain the shape of the filter 21 during normal filtration operation. Since the cage 22 has the same shape as the filter 21, the pressure gas from the filter 21 to the dust-containing air introduction chamber 4 side from the kinetic energy of the pressure gas acting in the axial direction of the filter (vertical downward direction in the illustrated example). It is difficult to obtain wave energy that will be obtained when exiting. For this reason, a large amount of pressurized gas is required to remove dust adhering to the filter 21, resulting in an increase in energy consumption.
The wave energy is only generated when the pressure gas escapes from the filter 21 to the dust-containing air introduction chamber 4 side, and the shape of the wave generated in the filter 21 by the pressure gas ejected from the nozzle hole 9 is as shown in FIG. As shown in FIG. 4, on the opening base end side of the filter 21, the wave height R2 is large, the wavelength L2 is short, the bulge of the filter 21 is large, and dust removal efficiency is high. The wave heights R2 ′ and R2 ″ are smaller, the wavelengths L2 ′ and L2 ″ are longer, and the bulge of the filter 21 is reduced and the dust dusting efficiency is lowered as it goes to the side.

  In view of the problems of the conventional bug-type dust collector, the present invention is provided with a pressure gas introducing means for discharging dust adhering to the filter by ejecting the pressure gas into the filter. To provide a bag type dust collector that maintains the wave generated by the pressure gas propagating through the filter up to the tip of the filter without increasing the amount of pressure gas used, and has excellent dust removal efficiency. And

  In order to achieve the above object, the bag type dust collector of the present invention divides the inside of a housing by a partition wall, one of the partitioned housing is a dust-containing air introduction chamber, and the other is a purified air chamber. Attach the filter opening base end located in the dust-containing air introduction chamber to the formed filter mounting hole, insert the filter cage into the filter, and attach to the filter by blowing out pressure gas into the filter In the bag type dust collector, in which a pressure gas introducing means for disposing of the dust is disposed, the filter cage is formed with a tapered portion that is reduced in diameter from the opening proximal end side to the distal end side of the filter. It is characterized by that.

  In this case, the tapered portion can be formed over the entire length of the filter.

  In this case, the tapered portion can be formed in the vicinity of the opening base end portion of the filter.

  Further, in these cases, the filter can be formed with a tapered portion having a diameter reduced from the opening proximal end side to the distal end side of the filter in accordance with the position of the tapered portion formed in the filter cage.

  The filter can be formed in a cylindrical shape having a uniform diameter.

  According to the bag-type dust collector of the present invention, the filter cage is formed with a tapered portion whose diameter is reduced from the opening proximal end side to the distal end side of the filter, and therefore along the tapered portion of the filter cage during the filtration operation. Even if the amount of pressure gas used is not increased by applying a radial component of the pressure gas jet force to the inclined inner peripheral surface of the filter in the shape. The kinetic energy of the pressure gas is converted into wave energy for removing dust, and the converted wave energy acts in the direction in which the wave height is large and the wavelength is shortened, and the wave reaches the tip of the filter. It is possible to provide a bug type dust collector that maintains and is excellent in dust removal efficiency.

  Further, when the tapered portion is formed over the entire length of the filter, the wave generated by the pressure gas propagating through the filter is not attenuated, and the dust removal efficiency can be further improved.

  In this case, when the tapered portion is formed in the vicinity of the opening base end portion of the filter, the taper portion is generated by the pressure gas toward the tip end side of the filter converted into wave energy generated in the vicinity region of the opening base end portion of the filter. A wave can be formed large in the vicinity of the opening proximal end portion that is a tapered portion, and can be maintained even on the distal end side of the filter.

  Further, when the filter is formed with a tapered portion that is reduced in diameter from the opening proximal end side to the distal end side of the filter in accordance with the position of the tapered portion formed in the filter cage, the filter has a tapered portion. The shape of the filter cage matches and the waves generated by the pressure gas converted into wave energy can be transmitted to the filter easily and reliably.

Further, when the filter is formed in a cylindrical shape having a uniform diameter, a negative pressure is generated in the filter during the filtration operation, so that the filter has a shape along the filter cage. The filter is also shaped along the filter cage, and the wave energy converted from the kinetic energy is such that the wave height generated by the pressure gas propagating through the filter is large and the wavelength is shortened. Works.
Further, by manufacturing only the filter cage with a shape having a tapered portion, it is possible to provide a bug-type dust collector having excellent dust removal efficiency, and thus the cost of the entire apparatus can be reduced.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a bug type dust collector of the present invention will be described based on the drawings. In addition, about the structure similar to a conventional apparatus, the same code | symbol and a series of code | symbol are attached | subjected, and description is abbreviate | omitted.

1 to 4 show a first embodiment of the bug type dust collector of the present invention.
This bug type dust collector 1 is formed in the partition wall 3 with the inside of the housing 2 partitioned by a partition wall 3, one of the partitioned housing 2 being a dust-containing air introduction chamber 4 and the other being a purified air chamber 5. By attaching the opening base end portion of the filter 7 disposed in the dust-containing air introduction chamber 4 to the filter mounting hole, and inserting the filter cage 10 into the filter 7, and blowing out pressure gas into the filter 7. A pressure gas introducing means P for disposing of dust adhering to the filter 7 is disposed, and a taper portion that is reduced in diameter from the opening proximal end side to the distal end side of the filter 7 in the filter cage 10. Ta and Tb are formed.

The filter cage 10 prevents the filter 7 from contracting inside due to the negative pressure generated by the suction force of the suction device F connected to the downstream side of the purified air chamber 5 during the filtration operation, and maintains the shape of the filter 7. The shape of the filter 7 is not particularly limited as long as it can be used, and in the present embodiment, a large number of support bars 10a having a length over the entire length of the filter 7 and the support bar 10a are held at a predetermined diameter. A plurality of support rings 10b attached at predetermined positions, and the upper end of the support bar 10a is attached to the annular cage plate 11.
Further, as the filter cage 10, a punching metal or a net-like member can be formed in a substantially cylindrical shape and used.

The formation part of the taper part formed in the filter cage 10 is not particularly limited. As shown in FIGS. 1 to 3, the taper part is formed over the entire length of the filter 7 (taper part Ta). As shown, it may be formed in the vicinity of the opening base end of the filter 7 (tapered portion Tb).
When the taper portion formed in the filter cage 10 is formed in the vicinity of the opening base end portion of the filter 7, the support bar 10a ′ that forms the distal end side of the filter 7 is straightened by the support bar 10a that forms the taper portion Tb. Part Sa is formed.

In the case of the filter 7 having a total length of about 6 m, the tapered portion Tb formed in the vicinity of the opening base end of the filter 7 is formed within a range of 1 to 3 m from the opening base end of the filter 7. A wave generated by the pressure gas toward the distal end side of the filter 7 converted into wave energy generated in the vicinity of the opening proximal end portion is formed largely in the vicinity of the opening proximal end portion as the tapered portion Tb. Can also be maintained on the side.
The wave propagation speed at this time is as high as about 10 to 20 m / sec.

The filter 7 expands the opening base end portion of the filter 7 on the inner peripheral surface of a cylindrical filter mounting bracket 12 in which an end portion disposed in a filter mounting hole formed in the partition wall 3 is bent inward. The expansion band B is attached by the expansion force.
As shown in FIGS. 3 to 4, the filter 7 has tapered portions 7Ta and 7Tb that are reduced in diameter from the opening proximal end side to the distal end side of the filter 7 and formed in the filter cage 10. , Tb.
As a result, the shapes of the filter 7 and the filter cage 10 match, and the wave energy converted from kinetic energy acts in a direction in which the wave height generated by the pressure gas propagating through the filter 7 is large and the wavelength is shortened. To do.
In addition, as shown in FIG. 4, the taper part Tb formed in the filter cage 10 is formed in the vicinity of the opening base end part of the filter 7, and the tip of the filter 7 rather than the support bar 10a forming the taper part Tb. When the straight portion Sa is formed by the support bar 10a ′ that forms the side, the filter 7 also forms the straight portion 7Sa in accordance with the position of the straight portion Sa of the filter cage 10.

And as shown in FIG.2 (b), when the component force X of the radial direction of the jet power Z of the pressure gas injected from the nozzle hole 9 acts on the internal peripheral surface of the taper part 7Ta of the filter 7, The kinetic energy of the pressure gas is forcibly converted into wave energy for removing dust.
As a result, the wave shape on the opening proximal end side of the filter 7 has a large wave height R1 and a short wavelength L1, the wave heights R1 ′ and R1 ″ of the waves generated toward the distal end side of the filter 7 are also large, L1 ′ and L1 ″ can also be maintained at a short level.

The method of using the bag type dust collector having the above configuration is that the air containing dust from the dust generation source is normally introduced by the suction force of the suction device F connected to the downstream side of the purified air chamber 5 of the housing 2. Guided to the chamber 4, the dust is filtered by the filter 7, and the purified air is discharged through the purified air chamber 5.
Then, when dust adheres to the filter 7 and the ventilation resistance reaches a predetermined value, or after a certain time has elapsed, the pressure gas is introduced into the injector tube 8 by opening and closing the on-off valve V of the pressure gas introducing means P. Are ejected intermittently, and a pressure gas that blows off dust adhering to the filter 7 is ejected from a plurality of nozzle holes 9 provided in the injector tube 8 toward the opening base end portion of the filter 7.

  At this time, the component force X that generates wave energy converted from kinetic energy is applied to the taper portions 7Ta and 7Tb of the filter 7 having a shape along the taper portions Ta and Tb of the filter cage 10 during the filtration operation. Acts in the direction of increasing the wave height of the wave shape, and dust can be effectively removed to the tip of the filter 7.

FIG. 5 shows a second embodiment of the bug type dust collector of the present invention.
In the bug type dust collector 1, the filter 7 is formed in a cylindrical shape having a uniform diameter.

  In this case, the taper portion of the filter cage 10 may be formed over the entire length of the filter 7, but there is a gap between the filter cage 10 on the tip side of the filter 7 and the inner peripheral surface of the filter 7. Since it becomes excessive, it is preferable to form the taper portion Tb in the vicinity of the opening base end portion of the filter 7 as shown in FIGS. 5 (a) to 5 (b).

  In the filter cage 10 shown in FIG. 5A, the tapered portion Tb is formed by the support bar 10a connecting the opening base end portion of the filter 7 to the next support ring 10b ′ toward the distal end side of the filter 7. Then, a taper portion in the opposite direction is formed by the support bar 10c connecting the support ring 10b ′ to the next support ring 10b from the support ring 10b toward the front end side of the filter 7, and the front end side of the filter 7 is supported more than the support bar 10c. The straight portion Sb is formed by the bar 10a ′.

  As a result, a space 13 is formed between the filter 7 and the filter cage 10 attached to the partition wall 3, and the filter 7 becomes negative by the filtration operation. Since the shape is along the filter cage 10, when the pressure gas is ejected from the nozzle hole 9, the filter 7 has the shape along the filter cage 10, and the wave energy converted from the kinetic energy is To provide a bag-type dust collector that operates in a direction in which the wave height is large and the wavelength is shortened, maintains the wave generated by the pressure gas propagating through the filter 7 up to the tip side of the filter 7, and has excellent dust removal efficiency. Can do.

  Further, in the filter cage 10 shown in FIG. 5 (b), the tapered portion Tb shown in FIG. 5 (a) can be provided without providing the support bar 10c that forms the tapered portion in the reverse direction of the filter cage 10. The straight portion Sa is formed by the support bar 10a ′ that is closer to the tip side of the filter 7 than the support bar 10a that forms the filter.

  In this case, a space 13 ′ formed between the filter 7 attached to the partition wall 3 and the filter cage 10 is formed widely up to the distal end side of the filter 7. Since the shape is along the cage 10, the filter 7 is also shaped along the filter cage 10 when the pressure gas is ejected from the nozzle hole 9, and the wave energy converted from kinetic energy has a large wave height. The bag type dust collector which acts in this direction and maintains the wave generated by the pressure gas propagating through the filter 7 up to the tip side of the filter 7 and is excellent in dust removal efficiency can be provided.

  The other configuration and operation of the present embodiment are the same as those of the first embodiment.

  As mentioned above, although the bug type dust collector of the present invention has been described based on a plurality of embodiments, the present invention is not limited to the configurations described in the above embodiments, and the configurations described in the embodiments are appropriately combined. The configuration can be changed as appropriate without departing from the spirit of the invention.

The bag type dust collector of the present invention has a characteristic that the wave generated by the pressure gas propagating through the filter can be maintained up to the tip side of the filter without increasing the amount of use of the pressure gas. It can be suitably used for the application of a bag-type dust collector in which a pressure gas introduction means is provided for discharging dust adhering to the filter by ejecting pressure gas therein.
In addition to the new bug type dust collector, the application target can be applied to the existing bug type dust collector by changing the filter cage and the like.

It is a front view of the partial cross section which shows the Example of the bag type dust collector of this invention. It is explanatory drawing of the filter cage and the taper part of a filter of the bug type dust collector, (a) is XX sectional drawing of FIG. 1, (b) is explanatory drawing of the component force which the jet output of compressed gas exerts on a filter. is there. It is front sectional drawing of the notch which shows the cage for filters of the bag type dust collector, and the taper part of a filter. The modification of the filter cage and the taper part of the filter are shown, (a) is a partially cutaway front sectional view, and (b) is a perspective view of the filter. 2 shows a second embodiment of the bug type dust collector, (a) is a partially cutaway front sectional view for explaining the filter cage and the taper portion of the filter, and (b) is another filter cage and the taper portion of the filter. Front cutaway view of partly cutout explaining It is a partial sectional front view which shows the Example of the conventional bug type dust collector. It is explanatory drawing of the filter cage and filter of the same bug type dust collector, and is YY sectional drawing of FIG. It is front sectional drawing of the notch which shows the cage for filters and the filter of the bag type dust collector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bug type dust collector 2 Case 3 Partition wall 4 Dust-containing air introduction chamber 5 Purified air chamber 7 Filter 7Ta Tapered portion of filter 7Tb Tapered portion of filter 10 Filter cage 10a Support bar 10b Support ring Ta Tapered portion Tb Tapered portion

Claims (5)

  A filter in which the inside of a housing is partitioned by a partition wall, one of the partitioned housings is a dust-containing air introduction chamber, and the other is a purified air chamber, and the filter is installed in the dust-containing air introduction chamber in a filter mounting hole formed in the partition wall A pressure gas introduction means is installed so that the filter cage is inserted into the filter and the pressure gas is blown into the filter so that dust adhering to the filter is removed. In the bug type dust collector, the bag type dust collector is characterized in that a taper portion whose diameter is reduced from the opening proximal end side to the distal end side of the filter is formed in the filter cage.   The bag type dust collector according to claim 1, wherein the tapered portion is formed over the entire length of the filter.   The bag-type dust collector according to claim 1, wherein the tapered portion is formed in the vicinity of the opening base end portion of the filter.   The taper part which diameter-reduces toward the front end side from the opening base end part side of a filter is formed in the said filter according to the position of the taper part formed in the filter cage, The claim 1, 2, or 3. The bug type dust collector described in 3.   The bag type dust collector according to claim 1, 2, or 3, wherein the filter is formed in a cylindrical shape having a uniform diameter.

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