JP2010179282A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector which increases the filtration area of a filter without enlarging the dust collector and which sweeps dust off with good energy efficiency by a pressurized gas. <P>SOLUTION: The filter 7 of the dust collector includes a cylindrical main filter 7a and a conic accessory filter 7b of which the length in the axial direction towards the opening base end side from the leading edge of the main filter 7a arranged in the inner peripheral side of the main filter 7a becomes 50% or more to the length in the axial direction of the main filter 7a. The cage of the dust collector consists of a main cage 10 which retains the configuration of the main filter over the whole length arranged in the inner peripheral side of the main filter 7a and a conic accessory cage 11 which retains the configuration of the accessory filter 7b over the whole length arranged in the inner peripheral side of the main cage 10 and in the outer peripheral side of the accessory filter 7b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust collector, and more particularly to a dust collector that can increase the filtration area with a filter of the same length and can effectively remove dust attached to the outer surface of the filter.

Conventionally, a dust collector has been widely employed to collect dust contained in exhaust gas discharged from an incinerator or an electric furnace.
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 outer surface of the filter is removed.

More specifically, as shown in FIG. 6, in order to remove dust adhering to the outer surface of the filter, the dust collector 20 divides the interior of the housing 2 up and down by a partition wall 3 and the lower part contains dust. The air introduction chamber 4, the upper portion 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).
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 cage 22 is inserted.
Further, the pressure gas supply means 6 and the pressure gas supply valve are used as the pressure gas introduction means P for discharging dust adhering to the outer surface of the filter 21 by ejecting the pressure gas into the filter 21. An injector tube 8 connected via the on-off valve V is provided.
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.

As a result, the air containing dust from the dust generation source by the suction force of the suction device F connected to the downstream side (downstream side in the air flow direction) of the purified air chamber 5 of the housing 2 is normally contained in the dust-containing air. Guided to the introduction chamber 4, 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 outer surface of the filter 21 and the ventilation resistance reaches a predetermined value, or periodically after a predetermined time has elapsed, the on-off valve V is opened for a short time, and the pressure of the pressure gas supply source 6 is increased. The gas is allowed to flow out instantaneously into the injector tube 8, the pressure gas is ejected into the filter 21 from the nozzle hole 9 provided in the injector tube 8, and the filter 21 is inflated toward the dust-containing air introduction chamber 4, whereby the filter 21. The dust adhering to the outer surface is removed (for example, see Patent Document 2).

By the way, in this kind of dust collector 20, the amount of processing air per unit time is important as a standard for evaluating the performance.
In this case, it is desired to reduce the size of the dust collector as much as possible and increase the processing air volume.
In general, the filter 21 used in this type of dust collector 20 is most popular with an outer diameter of about 160 mm and a length of about 6 m, and the filtration area per filter is about 3 m ² .

  As a method of increasing the filtration area per filter, as shown in FIG. 7, the lower end side of the cylindrical main filter portion 23 is formed longer and caged than the cage 25, The filter is configured by a cylindrical main filter portion 23 and an inner conical sub filter portion 24 by folding the conical portion as a sub filter portion 24 toward the inside of the cage 25. There is a method (for example, refer to Patent Document 3).

  As another method for increasing the processing air volume, there is a method for increasing the filtration area of one filter. For example, the processing air volume is improved by about 30% by changing the filter length from 6 m to 8 m. It will be.

JP 2007-175635 A JP 2004-351323 A Japanese Utility Model Publication No. 63-173324

By the way, when the lower end side of the filter is folded inward to increase the filtration area, when fixing the conical apex portion 24a, the support rod 25a installed on the cage 25 is arranged on the apex portion 24a of the sub filter portion 24. A stopper (not shown) is provided, and is fixed at a position about half of the axial length of the cage 25 in order to stabilize the conical sub filter portion 24. For this reason, the filtration area increases only by about 20 to 25%.
As shown in FIG. 7C, the sub filter portion 24 is folded inward so as to be supported by the support ring 25b on the distal end side of the cage 25. It is arranged in a close state.
In this state, when the filtration operation in which the inside of the filter becomes negative pressure is started, the main filter portion 23 and the sub filter portion 24 are in contact with each other at a predetermined distance D from the folded portion, and the contact portion filters dust-containing air. There was a problem that it could not be performed and substantially contributed to the improvement of the filtration area.

On the other hand, if the length of the filter 21 is increased in order to increase the filtration area of one filter, it is necessary to increase the size of the dust-containing air introduction chamber 4 of the dust collector 20, which increases the cost of the entire apparatus.
Furthermore, there is a problem that the pressure loss value generated when dust is blown off by the pressure gas ejected from the nozzle hole 9 provided in the injector tube 8 becomes large, resulting in poor energy efficiency.

  In view of the problems of the conventional dust collector, the present invention provides a dust collector capable of increasing the filtration area of the filter without increasing the size of the dust collector and efficiently removing dust by pressure gas. The purpose is to do.

  In order to achieve the above object, the dust collector of the present invention is formed on the partition wall by partitioning the inside of the housing with a partition wall, one of the partitioned housings being a dust-containing air introduction chamber and the other being a purified air chamber. Pressure to dispose dust attached to the filter by attaching the open base end of the filter located in the dust-containing air introduction chamber to the filter mounting hole, disposing the cage in the filter, and blowing out pressure gas into the filter In the dust collector provided with the gas introduction means, the filter is arranged so that the main filter part is cylindrical and the main filter part provided on the inner peripheral side of the main filter part is directed from the distal end toward the opening proximal end side. A conical sub-filter part whose length in the direction is 50% or more with respect to the axial length of the main filter part, and the cage is disposed on the inner peripheral side of the main filter part. Main filter section And a conical subcage which is disposed on the inner peripheral side of the main cage and on the outer peripheral side of the sub filter portion and holds the shape of the sub filter portion over the entire length thereof. It is characterized by comprising.

  In this case, a gap can be provided between the distal end portion of the main cage and the proximal end portion of the sub cage connected thereto.

  Moreover, the front-end | tip part of a main filter part and the base end part of a sub filter part can be covered with the lower end cap which the center part opened.

  Moreover, the front-end | tip part of a subfilter part can be covered with a conical upper end cap.

According to the dust collector of the present invention, the filter is provided with a cylindrical main filter portion and a length in the axial direction from the distal end of the main filter portion disposed on the inner peripheral side of the main filter portion toward the proximal end side of the opening. And a conical sub filter portion whose length is 50% or more with respect to the axial length of the main filter portion, and the cage is disposed on the inner peripheral side of the main filter portion. A main cage that holds the shape of the sub-filter portion, and a conical shape that is disposed on the inner peripheral side of the main cage and on the outer peripheral side of the sub-filter portion and holds the shape of the sub-filter portion over the entire length. By constituting from the sub-cage, the filtration area of the sub-filter part is 30 to 50% of that of the main filter part, and the filtration area can be increased. Can be reduced to about 7 kPa, The dust collector of 5000 m ³ / min classes, it is possible to realize energy saving operation of the order of 18%.
Further, even when a conical sub filter portion having an axial length of 50% or more with respect to the axial length of the main filter portion is used by arranging the sub cage, it occurs during the filtration operation. It is possible to minimize the pulling of the secondary filter part on the outer peripheral side (purified air chamber side) due to negative pressure, and to suppress the contact between the main filter part and the secondary filter part in the vicinity of the folded part. The problem of substantial reduction of the filtration area due to can be solved.
Furthermore, the pressure gas injected when dust is blown off hits the surface of the conical sub-filter part, so that the pressure gas can flow in the direction of diffusing from the central axis of the filter. It is possible to improve energy efficiency when dust is removed by gas.

  Further, by providing a gap between the distal end portion of the main cage and the proximal end portion of the sub-cage connected thereto, the contact between the main filter portion and the sub-filter portion in the vicinity of the folded portion at the time of filtration operation can be achieved. It can suppress more reliably and can solve the problem of the substantial fall of the filtration area by contact of both.

  Further, by covering the distal end portion of the main filter portion and the proximal end portion of the sub filter portion with a lower end cap having an open center portion, the distal end portion of the main filter portion and the proximal end portion of the sub filter portion are included. It is possible to prevent rapid wear due to exposure to dust air.

  In addition, by covering the tip portion of the sub-filter portion with a conical upper end cap, the pressure gas injected during dust removal directly hits the tip surface of the conical sub-filter portion. In addition to preventing, the conical upper end cap allows the pressure gas to flow in the direction of diffusing from the central axis of the filter, improving the energy efficiency when dust is removed by the pressure gas. it can.

It is a front view of the partial cross section which shows one Example of the dust collector of this invention. It is explanatory drawing of the filter of the dust collector, (a) is the state of cloth, (b) is a front view of the filter after sewing. It is explanatory drawing of the cage of the dust collector, (a) is a partially cutaway front view, (b) is an XX end view of (a), (c) is a YY end view of (a), ( d) is a ZZ end view of (a), and (e) is an enlarged sectional view of a part of the W portion of (a). It is the schematic explaining the method of attaching a filter and a cage to the dust collector, (a) shows the state which attached the filter, (b) shows the state which inserts a cage in a filter. It is front sectional drawing of the notch which shows the state which attached the filter and cage to the dust collector. It is a front view of the partial cross section which shows the conventional dust collector. It is explanatory drawing of the filter and cage of the dust collector, (a) is the front stage which attaches a filter to a cage, (b) is the state which attached the filter to the cage, (c) is the outline which shows the state of the filter in filtration operation FIG.

  Hereinafter, embodiments of the dust collector of the present invention will be described with reference to the drawings.

1 to 5 show an embodiment of the dust collector of the present invention.
The dust collector 1 has a housing 2 partitioned by a partition wall 3, one of the partitioned housings 2 is a dust-containing air introduction chamber 4, and the other is a purified air chamber 5. The opening base end portion of the filter 7 disposed in the dust-containing air introduction chamber 4 is attached to the hole, the cage (the main cage 10 and the sub cage 11) is disposed in the filter 7, and the pressure gas is ejected into the filter 7. Thus, a pressure gas introducing means P for removing dust adhering to the outer surface of the filter 7 is disposed.

  The dust collector 1 includes a cylindrical main filter portion 7a and a main filter portion 7a disposed on the inner peripheral side of the main filter portion 7a from the distal end toward the opening proximal end side. The cage is composed of a conical sub-filter part 7b whose length in the direction is 50% or more, preferably 60% or more with respect to the axial length of the main filter part 7a. On the inner peripheral side (purified air chamber 5 side) of the main cage 10 that holds the shape of the main filter portion 7a over its entire length, and on the inner peripheral side of the main cage 10 (purified air chamber 5 side). And it is comprised on the outer peripheral side (purification air chamber 5 side) of the subfilter part 7b, and it is comprised from the conical subcage 11 which hold | maintains the shape of the subfilter part 7b over the full length.

The dust-containing air introduction chamber 4 is divided into a casing part 4a where the filter 7 is located and a hopper part 4b where collected dust is collected, and the dust-containing air is introduced into the inlet I1 at the position of the casing part 4a, It is introduced from I2 and the inlet I3 at the position of the hopper portion 4b.
At this time, the opening area of each inlet port is adjusted, and the inlet ports I1 and I2 corresponding to the main filter portion 7a are each about 50/140 according to the ratio of the filtration area of the main filter portion 7a and the sub filter portion 7b. Air containing dust of a total amount (about 100/140) is introduced, and air containing dust of 40/140 is introduced into the inlet I3 corresponding to the sub-filter portion 7b. It is preferable to adjust. This is because in this embodiment, the filtration area of the sub-filter part 7b is about 40% of the filtration area of the main filter part 7a.

The manufacturing method of the filter 7 is not particularly limited, but as shown in FIG. 2A, a fabric 7a ′ made of a rectangular nonwoven fabric or the like that becomes the main filter portion 7a and a triangle that becomes the sub filter portion 7b. The fabric 7b 'is sewn into a cylindrical shape and a conical shape, the T1 portion of the fabric 7a' and the T2 portion of the fabric 7b 'are sewn together, and attached to the sub-cage 11 at the tip portion of the fabric 7b'. A guide string 15 to be used is attached.
Further, the T1 portion and the T2 portion may be sewn after being attached to the cage.

  The main cage 10 minimizes that the main filter portion 7a is drawn into the inner peripheral side (purified air chamber 5 side) by 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. The shape is not particularly limited as long as the shape of the main filter portion 7a can be held to the limit, and in the present embodiment, a large number of lengths over the entire length of the filter 7 are provided. The support bar 10a and a plurality of support rings 10b attached at predetermined positions to hold the support bar 10a at a predetermined diameter, and the upper end of the support bar 10a is attached to the annular cage plate 12. .

  Then, each support bar 10a is folded back at the distal end side to become a sub-support bar 11a for the sub-cage 11, and each sub-support bar 11a is located in the vicinity of the opening proximal end side of the main cage 10 (when the sub-filter part 7b is attached). The length of the sub filter portion 7b is converged and fixed at a position where the length of the main filter portion 7a is 50 to 100%, preferably 60 to 100%.

  The sub-cage 11 minimizes that the sub-filter part 7b is drawn into the outer peripheral side (purified air chamber 5 side) by a 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. The shape is not particularly limited as long as the shape of the sub filter portion 7b can be maintained, and in this embodiment, the sub support bar 11a and the sub support bar 11a are connected to each other. A plurality of auxiliary support rings 11b attached at predetermined positions for holding in a predetermined conical shape are provided.

In this case, as shown in FIGS. 3 (a) and 3 (e), the connecting portion between the main cage 10 and the sub cage 11 formed by folding back each support bar 10a at the front end side is connected to the main filter portion 7a and the sub filter portion 7b. After mounting, the center portion 13a is covered with the lower end cap 13 opened.
Thereby, the front-end | tip part of the main filter part 7a and the base end part of the subfilter part 7b are protected by the lower end cap 13, and it can prevent that the said part is rapidly abraded by being exposed to dust-containing air. .

Further, the converging end of each sub-support bar 11a constituting the sub-cage 11 may be fixed by fixing means such as welding, but in this embodiment, the guide disposed at the tip portion of the sub-filter portion 7b. A conical (including frustum-shaped) upper end cap 14 having a hole formed in the central portion so that the string 15 can be inserted is disposed and fixed thereto.
Thereby, the front-end | tip part of the subfilter part 7b with which the subcage 11 was mounted | worn can be covered and protected by the upper end cap 14, and the pressure gas injected at the time of dust removal is conical subfilter part 7b The conical top cap 14 allows the pressure gas to flow in the direction of diffusing from the central axis of the filter 7, so that dust can be removed by the pressure gas. In this case, the energy efficiency can be improved.

In this case, as shown in FIG. 3 (e), a gap L (this gap L is not particularly limited) between the distal end portion of the main cage 10 and the proximal end portion of the sub cage 11 connected thereto. However, it is usually set to about 10 to 50 mm).
As a result, in the vicinity of the folded portion on the front end side of each support bar 10a, a space of “gap L + diameter of support bar 10a + diameter of sub support bar 11a” between main filter portion 7a and sub filter portion 7b. The contact between the main filter portion 7a and the sub filter portion 7b in the vicinity of the folded portion during the filtration operation can be more reliably suppressed, and a substantial reduction in the filtration area due to the contact between the two can be achieved. The problem can be solved.

  Next, a method for attaching the filter 7 to the dust collector 1 will be described.

  First, as shown in FIG. 4A, the filter 7 is attached to the cage plate 12, arranged on the dust-containing air introduction chamber 4 side, and the guide string 15 attached to the tip of the sub filter portion 7 b is attached to the partition wall 3. Is also located on the purified air chamber 5 side.

Next, as shown in FIG. 4B, the main cage 10 and the sub cage 11 are inserted into the filter 7 from the purified air chamber 5 side.
At this time, the main cage 10 and the sub-cage 11 are placed on the partition wall 3 while the guide string 15 is passed through a hole formed at the center of the upper end cap 14 disposed at the tip of the sub-cage 11.

  When the main cage 10 and the sub cage 11 are placed on the partition wall 3 and become the state shown in FIG. 5, the guide string 15 is pulled up until the sub filter portion 7b is along the sub cage 11, and the guide string 15 is Fix to cap 14 and cut off excess.

In the bag-type dust collector having the above-described configuration, air containing dust from the dust generation source is normally supplied 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. The dust is guided and filtered by the filter 7, and the purified air is discharged through the purified air chamber 5.
At this time, as shown in FIG. 1, it corresponds to the main filter portion 7a in accordance with the ratio of the filtration area of the main filter portion 7a and the sub filter portion 7b from the inlets I1 and I2 at the position of the casing portion 4a. An amount of air of about 50/140 (total of about 100/140) is introduced into each of the inlets I1 and I2, and an amount of air of 40/140 is introduced into the inlet I3 corresponding to the sub-filter portion 7b. To be.
Then, when dust adheres to the outer surface of the main filter portion 7a and the sub filter portion 7b of the filter 7 and the ventilation resistance reaches a predetermined value, or periodically after a certain period of time, the on-off valve of the pressure gas introduction means P By opening and closing V, pressure gas is intermittently ejected to the injector tube 8 and adheres to the outer surface of the filter 7 from the plurality of nozzle holes 9 provided in the injector tube 8 toward the opening base end of the filter 7. The pressure gas that blows off the dust is discharged.

At this time, the pressure gas effectively acts on the main filter portion 7a and the sub filter portion 7b because the cross-sectional area passing through the peripheral surface of the conical sub filter portion 7b gradually decreases. The effect of payout increases.
Moreover, when the filtration area is increased by about 40%, the pressure loss value is also reduced by about 40%, the pressure loss value can be reduced to 1.2 kPa, and the pressure loss value at the device is added about 2.5 kPa. Even with a 15000 m ³ / min class dust collector, energy saving operation of about 18% can be realized.

  The dust collector of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations may be changed as appropriate without departing from the spirit of the present invention. It is something that can be done.

The dust collector of the present invention has the characteristics that the filtration area of the filter can be increased without increasing the size of the dust collector, and dust can be efficiently removed by pressure gas. It can be suitably used for a dust collector in which a pressure gas introduction means is provided to discharge dust attached to the outer surface of the filter by ejecting pressure gas to the filter.
Moreover, the application object can be applied to an existing dust collector in addition to a new dust collector by changing the filter and the cage.

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Case 3 Compartment wall 4 Dust-containing air introduction chamber 5 Purified air chamber 7 Filter 7a Main filter portion 7b Sub filter portion 10 Main cage 11 Sub cage 13 Lower end cap 14 Upper end cap

Claims (4)

  A filter in which the inside of the housing is partitioned by a partition wall, one of the partitioned housings is a dust-containing air introduction chamber, the other is a purified air chamber, and the filter mounting hole formed in the partition wall is arranged in the dust-containing air introduction chamber In the dust collector provided with a pressure gas introduction means for disposing the cage in the filter, disposing the cage in the filter, and discharging dust adhering to the filter by ejecting the pressure gas into the filter. The axial length of the cylindrical main filter portion and the axial length of the main filter portion from the distal end of the main filter portion disposed on the inner peripheral side of the main filter portion toward the proximal end side of the opening And a conical sub-filter portion that is 50% or more of the height, and the cage is disposed on the inner peripheral side of the main filter portion to hold the shape of the main filter portion over its entire length. A main cage and the Dust collector characterized by being configured and the inner circumferential side of the cage is disposed on the outer peripheral side of the secondary filter section the shape of the auxiliary filter unit and a conical secondary cage for holding over its entire length.   2. The dust collector according to claim 1, wherein a gap is provided between a distal end portion of the main cage and a proximal end portion of the sub cage connected thereto.   The dust collector according to claim 1 or 2, wherein a front end portion of the main filter portion and a proximal end portion of the sub filter portion are covered with a lower end cap having an open center portion.   The dust collector according to claim 1, 2, or 3, wherein a tip end portion of the sub filter portion is covered with a conical upper end cap.

Images