JP5271311B2 - Dust collector - Google Patents

Description

  The present invention provides a housing whose interior is partitioned into a dust-containing air introduction chamber and a purified air chamber by a partition wall, and is provided on the partition wall, from the dust-containing air introduction chamber side to the purified air chamber side inside the housing. A filter mechanism that collects dust contained in the flowing dust-containing air, and compressed air is ejected in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side through the filter mechanism, and is captured by the filter mechanism. The present invention relates to a dust collecting apparatus including an ejection mechanism that cleans collected dust.

  The dust collector collects dust contained in dust-containing air flowing from the dust-containing air introduction chamber side to the purified air chamber side in the housing by a filter mechanism, and supplies it from an incinerator or crushing equipment. It is an apparatus for purifying dust-containing air. Further, the dust collected and adhered to the filter mechanism can be cleaned by being blown off by ejecting compressed air from the purified air chamber side to the dust-containing air introduction chamber side through the filter mechanism. (For example, refer to Patent Document 1).

  For example, in the dust collecting apparatus described in Patent Document 1, the filter mechanism is configured to include a bag filter (filter cloth) covered with a squirrel-cage shaped support. A jet hole for jetting compressed air is disposed at a position facing the opening of the bag filter, and the compressed air jetted from the jet hole is guided to the opening between the jet hole and the opening. A Venturi tube is provided. This ejection hole is formed in the outer peripheral surface of the cylindrical blow tube which can flow compressed air.

  Thereby, in the dust collector of patent document 1, at the time of cleaning of a bag filter, compressed air can be sent into a bag filter through a venturi pipe from the ejection hole arrange | positioned at the purification air chamber side. In this case, almost all of the compressed air ejected from the ejection holes can be sent into the bag filter without waste by the induction of the venturi tube, and the dust adhering to the bag filter can be removed without interference with the compressed air. It is said that it can be removed and cleaned. Further, since the compressed air ejected from the ejection hole can completely close the opening of the tip of the venturi tube in a sealed state, it is said that the backflow of the compressed air from the bag filter can be prevented.

  Furthermore, in the dust collecting apparatus described in Patent Document 1, each blow hole is formed in the blow tube so as to pass through each bag filter (bottom cylindrical filter with a bottom) in the tube axis direction. Is formed so that the axis of each ejection hole passes through the center of the opening of each bag filter.

JP-A-8-57232

Here, when supplying compressed air into the blow tube, the compressed air flows at a very high speed (for example, about the speed of sound) from the base end side to the tip end side in the blow tube. The velocity vector of the compressed air ejected from the ejection hole includes not only the velocity component toward the center of the opening of the cylindrical filter but also the velocity component toward the distal end side of the blow tube. Therefore, the compressed air ejected from the ejection hole may be ejected to a position shifted toward the distal end side of the blow tube from the opening of the cylindrical filter. Such a situation is particularly prominent in the ejection hole on the base end side of the blow tube close to the compressed air supply source.
In this case, even when the compressed air supplied from the supply source is supplied under the same conditions in terms of the amount, speed, etc., the jetted compressed air is not properly introduced into the cylindrical filter. The ability to remove dust adhering to the outside of the filter is reduced.

  Further, in the dust collecting apparatus described in Patent Document 1, in order to surely send compressed air into the cylindrical filter, the compressed air ejected from the blow hole is supplied to the blow hole of the blow tube to the opening of the cylindrical filter. It is also conceivable to adopt a configuration in which a jet nozzle for guiding is provided. However, in the case where the ejection nozzles are disposed in all the ejection holes disposed so as to face each of the many cylindrical filters, the configuration of the apparatus becomes complicated and an additional manufacturing cost is required.

  The present invention has been made in view of such a situation, and an object of the present invention is to ensure that the compressed air ejected from the ejection holes is reliably contained in the cylindrical filter while the apparatus configuration is simple and the production cost can be reduced. It is an object of the present invention to provide a dust collector capable of more efficiently cleaning dust adhering to a cylindrical filter.

In order to achieve the above object, a dust collector according to the present invention includes a housing that is partitioned by a partition wall into a dust-containing air introduction chamber and a purified air chamber, the partition wall, A filter mechanism for collecting dust contained in the dust-containing air flowing from the dust-containing air introduction chamber side to the purified air chamber side; and the dust-containing chamber from the purified air chamber side via the filter mechanism A dust collecting device comprising a jetting mechanism for jetting compressed air in a pulsed manner to the air introduction chamber side and cleaning dust collected by the filter mechanism, the characteristic configuration of which is
The filter mechanism is configured by arranging a plurality of bottomed cylindrical filters in parallel along a predetermined filter arrangement direction,
The ejection mechanism has a cylindrical passage formed so as to extend in a state along the filter disposition direction from a proximal end side connected to a compressed air source via an on-off valve toward a distal end side. A plurality of jet holes corresponding to the respective openings of the plurality of cylindrical filters are arranged in parallel on the tube wall of the flow pipe portion,
Displacement of the injection hole axial center arrival position, which is the arrival point of the axial center of the injection hole with respect to the opening surface including the opening, toward the proximal end side with respect to the opening center position that is the central point of the opening Each of the opening and the ejection hole is arranged such that the amount becomes larger as it is closer to the base end side.

  According to this characteristic configuration, with respect to the arrangement positions of the corresponding cylindrical filter openings and the ejection holes in the filter arrangement direction, the openings are arranged with respect to the opening center position which is the center point of the opening of the cylindrical filter. The base end of the injection hole axial center arrival position, which is the arrival point of the axial center of the injection hole with respect to the including opening surface (where the axial core reaches the opening surface of the cylindrical filter when the axial core of the injection hole is extended) The positions of the openings and the ejection holes are set so that the amount of displacement toward the part increases as the distance toward the base end increases. As a result, the compressed air flows through the flow pipe portion and is ejected from the respective ejection holes, and the position where the compressed air reaches the opening surface of the cylindrical filter is closer to the distal end side than the opening center position of the cylindrical filter. Even if it is displaced, the displacement of the ejection hole axial center arrival position of the ejection hole with respect to the center position of the opening of the cylindrical filter toward the proximal end side so as to cancel out the deviation amount toward the distal end side The amount can be set appropriately. Therefore, a larger portion of the jetted compressed air can be reliably introduced into the cylindrical filter, and dust attached to the outside of the cylindrical filter can be surely removed.

More specifically, in the dust collector, a plurality of cylindrical filters are arranged in parallel along a predetermined filter arranging direction, and a cylindrical flow pipe portion through which compressed air flows is provided. It is formed to extend from the base end side connected to the compressed air source via the on-off valve toward the distal end side which is the closed end in a state along the filter disposition direction. A plurality of jet holes are arranged in parallel on the tube wall of the flow pipe portion so as to correspond to the respective openings of the plurality of cylindrical filters, and each jet hole faces the opening of each cylindrical filter. It is arranged at the place. In this case, when the compressed air is supplied into the flow tube portion, the compressed air flows at a very high speed (for example, about the speed of sound) from the base end side to the tip end side in the flow tube portion. Therefore, in the state where the velocity vector of the compressed air contains not only the velocity component toward the center point of the opening of the cylindrical filter but also the velocity component toward the tip end side of the flow tube portion, It is ejected from the hole. The velocity component of the compressed air ejected from each ejection hole toward the distal end side gradually weakens as it flows through the flow pipe portion from the proximal end side toward the distal end side. That is, the compressed air ejected from the ejection hole on the base end side in the filter arrangement direction maintains the velocity component toward the distal end side, so that the ejected compressed air is retained in the opening surface of the cylindrical filter. The amount of deviation of the arrival point that reaches the front end side with respect to the center position of the opening of the cylindrical filter becomes larger as the compressed air is ejected from the ejection hole on the proximal end side.
Therefore, in the dust collector, as described above, the opening where the injection hole axial center arrival position, which is the arrival point of the axial center of the injection hole for discharging compressed air, is the center point of the opening of the corresponding cylindrical filter. The cylindrical filter is disposed at a location that is displaced by a predetermined amount of displacement on the base end side in the filter disposition direction from the center position of the part, and further, the displacement amount becomes larger as it is closer to the base end side. The arrangement position of the opening and the ejection hole is set.
As a result, even when the velocity vector of the compressed air includes a velocity component toward the distal end portion of the flow tube portion, the cylindrical shape is set so as to cancel out the deviation amount that the compressed air is displaced toward the distal end portion due to the velocity component. Since the displacement amount in the filter disposition direction between the center position of the opening of the filter and the position where the ejection hole reaches the center of the ejection hole is appropriately set, a larger part of the compressed air is surely introduced into the cylindrical filter. be able to.

  Further, the dust collector has a structure in which the ejection holes are formed in the tube wall of the flow pipe section, and the relative positional relationship between each ejection hole and the opening of the cylindrical filter is set to an appropriate position in the filter arranging direction. Therefore, the configuration is very simple and the manufacturing cost can be reduced.

  Therefore, while the device configuration is simple and the manufacturing cost can be reduced, the compressed air ejected from the ejection holes is surely ejected into the cylindrical filter, and the dust adhering to the cylindrical filter is more efficiently cleaned. can do.

According to a further feature of the dust collector according to the present invention, the displacement amount in the i-th opening and the ejection hole from the tip end side is ΔP _i , the number of the plurality of cylindrical filters is N, and the cylinder Compressed air ejected from the ejection hole when the diameter of the filter is D and the ejection hole axial center arrival position is made coincident with the central position of the opening in the opening and ejection hole on the most proximal end side The amount of deviation of the arrival point that reaches the opening surface including the opening to the tip end side with respect to the opening center position is A,
ΔP _i = (i−1) × A / (N−1) ± R
Each of the openings and the ejection holes is arranged so as to satisfy the relationship of 0 ≦ R ≦ (D / 2).

According to this characteristic configuration, the amount of displacement for displacing the ejection hole axial center arrival position of the ejection hole to the proximal end side in the filter disposition direction with respect to the opening center position of the cylindrical filter is located on the distal end side. Since each of the opening and the ejection hole located on the base end side from the specific opening and the ejection hole can be set based on a predetermined standard, the arrangement position of the opening and the ejection hole of the cylindrical filter can be determined. It can be set appropriately.
Specifically, i is an arbitrary order when ordering the opening and the ejection hole located on the proximal end side from the specific opening and ejection hole located on the distal end side in the filter arrangement direction, i, the distal end side The displacement amount in the i-th opening and the ejection hole from ΔP _i is
ΔP _i = (i−1) × A / (N−1) ± R
Each of the opening and the ejection hole is arranged so as to satisfy the relationship of 0 ≦ R ≦ (D / 2).
Therefore, the displacement amount ΔP _i of the corresponding opening and ejection hole can be set separately according to the order i (position) in the filter arrangement direction, and basically (in order from the distal end side to the proximal end side) ( A / (N-1)) can be set to increase sequentially. At this time, the amount of deviation A is determined so that the compressed air ejected from the ejection hole corresponds to the opening when the ejection hole axial center arrival position is matched with the opening center position in the opening and ejection hole on the most proximal end side. This is the amount of deviation of the arrival point that reaches the opening surface including the part toward the tip end side with respect to the opening center position. This deviation amount A is representative of the velocity component toward the tip of the velocity vector of the compressed air ejected from the ejection hole, so that by using this deviation amount A, the compressed air is caused by the velocity component. The displacement amount ΔP _i can be set so that the arrival point that reaches the opening surface of the cylindrical filter cancels out the deviation amount that shifts from the center position of the opening portion of the cylindrical filter toward the tip end side. Therefore, it is possible to set the displacement amount ΔP _i corresponding to the compressed air ejected from the ejection hole under a predetermined condition (pressure, speed, amount, etc.). The deviation amount A may be a deviation amount measured in advance or an empirically known deviation amount. For example, the deviation amount A may be a cylindrical filter. The diameter D may be set to an appropriate size.
Further, the displacement amount ΔP _i falls within a range shifted by the radius R (± D / 2) of the cylindrical filter in the filter disposition direction with reference to (i−1) × A / (N−1). Therefore, it is possible to adopt a configuration in which the compressed air to be ejected is surely introduced into the cylindrical filter while providing a certain degree of freedom to the displacement amount ΔP _i .

  A further characteristic configuration of the dust collector according to the present invention is that the plurality of cylindrical filters are arranged in parallel so that the cylindrical shaft cores are equidistant and parallel to each other, and the plurality of ejection holes are arranged on the shaft. The cores are arranged in parallel so as to be parallel to each other at equal intervals.

  According to this characteristic configuration, the cylindrical shaft centers of the plurality of cylindrical filters are arranged in parallel with each other at equal intervals, and the axial centers of the plurality of ejection holes are arranged in parallel with each other at equal intervals, so that the center of the opening of the cylindrical filter It can be configured such that the displacement amount of the ejection hole toward the proximal end side of the ejection hole axial center arrival position (axial core) with respect to the position (cylinder axial core) becomes larger as it is closer to the proximal end side. As a result, the arrangement of the openings and the ejection holes of the cylindrical filter is realized with a simple configuration, and the compressed air ejected from the ejection holes is reliably introduced into the cylindrical filter while minimizing the modification of the apparatus. It can be.

The further characteristic configuration of the dust collecting apparatus according to the present invention is to match the jet hole axial center arrival position and the opening center position in the opening and the jet hole on the most distal end side,
The arrangement is such that the arrangement intervals of the plurality of ejection hole axial center arrival positions are set larger than the arrangement intervals of the plurality of opening center positions, and the displacement amount is increased as it is closer to the base end side.

  According to this characteristic configuration, the cylinder axes of the plurality of cylindrical filters are equally spaced from each other in the state where the nozzle hole core arrival position and the opening center position coincide with each other in the opening and the injection hole on the most distal end side. And the axial centers of the plurality of ejection holes are arranged in parallel with each other at equal intervals, and the arrangement interval of the respective arrival positions of the ejection hole axes is set to be larger than the arrangement interval of the center positions of the respective openings. Thereby, it can comprise so that the said displacement amount may become large, so that it may be close to the base end part side about all the opening parts and ejection holes which reach the base end part side from the most front end part side. In addition, the configuration for that purpose can be a simple configuration that only changes the arrangement of the openings and the ejection holes of the cylindrical filter, and the compressed air ejected from the ejection holes while minimizing the modification of the apparatus. Can be more reliably introduced into the cylindrical filter.

Schematic side sectional view of the dust collector of the present invention Schematic top view of the dust collector of the present invention Enlarged side sectional view of the vicinity of the ejection hole The simulation result which shows the ejection state of the compressed air in the dust collector of this invention The simulation result which shows the ejection state of the compressed air in the dust collector of this invention Enlarged side sectional view of the vicinity of the ejection hole in a conventional dust collector Simulation results showing the state of compressed air ejection in a conventional dust collector Simulation results showing the state of compressed air ejection in a conventional dust collector

Hereinafter, embodiments of a dust collector B according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the dust collector B is provided on the partition wall 4, with the housing 1 partitioned inside by the partition wall 4 into the dust-containing air introduction chamber 2 and the purified air chamber 3, A plurality of cylindrical filters 5 (an example of a filter mechanism) for collecting dust contained in the dust-containing air G flowing from the dust-containing air introduction chamber 2 side to the purified air chamber 3 side in the housing 1; A jetting mechanism 6 for jetting compressed air H in a pulse shape from the purified air chamber 3 side to the dust-containing air introduction chamber 2 side through the cylindrical filter 5 and cleaning the dust collected in the cylindrical filter 5; It is prepared for. The dust collector B also controls the operation of the dust collector B such as the operation of the pressure difference detector (not shown) that detects the pressure difference between the inside and the outside of the cylindrical filter 5 and the ejection mechanism 6. A control unit (not shown) is provided.

The casing 1 is purified by a dust-containing air introduction chamber 2 in which the inside is partitioned by a partition wall 4 in the vertical direction, the dust-containing air G flows in the lower portion, and a cylindrical filter 5 provided in the partition wall 4 in the upper portion. A purified air chamber 3 through which the purified air C flows is formed. The casing 1 is formed in a substantially rectangular shape when viewed from above, with the outer shape of the location where the cylindrical filter 5 is disposed in the dust-containing air introduction chamber 2 and the location where the purified air chamber 3 is formed, and the cylinder in the dust-containing air introduction chamber 2. The lower outer shape of the part where the filter 5 is disposed is formed in a funnel shape. A dust-containing air introduction path 7 for introducing dust-containing air G from an incinerator or the like (not shown) into the dust-containing air introduction chamber 2 is formed at the upper end portion of the housing 1 formed in the funnel shape. A purified air discharge passage 8 for discharging the purified air C purified by the cylindrical filter 5 from the purified air chamber 3 is formed at an upper portion formed in the rectangular shape of the housing 1. A suction device (not shown) is provided on the downstream side of the purified air discharge path 8 so that the purified air C in the purified air chamber 3 can be sucked into the external space. In addition, a discharge port 9 provided with a rotary valve is formed at the lower end of the portion formed in the funnel shape of the housing 1, and the dust-containing air introduction chamber 2 generated by cleaning the cylindrical filter 5 described later or the like. It is configured so that dust and the like inside can be discharged.
Accordingly, the dust-containing air G generated in an incinerator or the like (not shown) is introduced into the dust-containing air introduction chamber 2 via the dust-containing air introduction path 7 by the suction force of the suction device (not shown), Dust is collected by the cylindrical filter 5 to become purified air C, which is discharged from the purified air chamber 3 to the external space connected to the downstream side of the dust collector B through the purified air discharge path 8. .

Although the detailed illustration is omitted, the cylindrical filter 5 has a bottomed cage shape (for example, a bottomed cylindrical cage shape in which a plurality of linear rods are attached to a plurality of ring-shaped frames formed in an annular shape. As a bag filter in which a bag-like (bottomed tubular) bug (not shown) configured to allow the passage of dust-containing air G is covered outside a support body (not shown) formed in It is configured. The bug is composed of a filter cloth that can satisfactorily collect dust in the dust-containing air G. For example, a base cloth formed by a non-woven fabric attached on the outside of the cloth with a cloth inside, or a non-woven cloth or woven cloth, etc. Consists of. The material of the filter cloth is made of synthetic fiber or glass fiber. The lower part of the bug has a bag shape and the upper part has an opening, and the upper end of the bug is sandwiched and fixed between the support and the partition wall 4.
As shown in FIGS. 1 to 3, the cylindrical filter 5 is attached to the partition wall 4 in a suspended state with an opening 5 a formed at the upper end. The plurality of bottomed cylindrical tubular filters 5 are configured so that the cylindrical axis X (vertical direction in FIG. 1) of each cylindrical filter 5 is orthogonal to the filter arrangement direction (horizontal direction in FIG. 1). The shafts X are arranged in parallel with each other along the filter arrangement direction so that the axes X are parallel to each other. In this embodiment, 256 cylindrical filters are arranged in a state where 16 pieces are arranged in a direction along the filter arranging direction and 16 pieces are arranged in a direction orthogonal to the filter arranging direction (the depth direction in FIG. 1). However, the arrangement location, the number of arrangements, the shape of bugs, and the like can be appropriately changed in relation to the amount of dust processing.

  The ejection mechanism 6 has a header pipe 13 (an example of a compressed air source) that stores compressed air H, and a distal end from the base end portion 14 </ b> A connected to the header pipe 13 via an air on-off valve (an example of an on-off valve) 12. A cylindrical flow pipe portion 14 extending in the filter arrangement direction toward the portion 14B, and a through-hole formed in the tube wall of the flow pipe portion 14 in a direction parallel to the cylinder axis X And a plurality of ejection holes 16 for ejecting the compressed air H flowing through the flow pipe section 14. And the ejection mechanism 6 is comprised so that the compressed air H can be ejected in the inside of each cylindrical filter 5 in a pulse form.

The header pipe 13 adjusts the pressure of compressed air H from a compressor or the like (not shown) via a pressure regulating valve 11 provided in the compressed air supply path 10 and can be stored in the internal space. It is configured. The pressure and air amount of the compressed air H stored in the header pipe 13 can be set as appropriate according to the pressure and air amount of the compressed air H that needs to be ejected. The pressure can be set to about 2 kg / cm ² and the capacity to 0.4 m ³ .

  As described above, the flow pipe portion 14 is configured in a cylindrical shape extending in the filter arrangement direction, the base end portion 14A side is communicated with the header pipe 13 via the air on-off valve 12, and the tip end portion 14B side is closed. ing. Thereby, the flow-through pipe part 14 directs the compressed air H stored in the header pipe 13 from the base end part 14A side to the front end part 14B side via the air on-off valve 12 provided in the header pipe 13. It is configured so that it can flow through. Note that the opening and closing of the air on / off valves 12 is configured to be controllable by operating sections 15 provided corresponding to the respective air on / off valves 12.

  The ejection hole 16 is formed in the tube wall of the flow-through pipe portion 14 so as to penetrate in the axis Y direction which is parallel to the cylinder axis X of the cylindrical filter 5 and is a substantially circular hole in plan view. Yes. The ejection holes 16 are located at locations facing the cylindrical filter 5 in a direction parallel to the cylindrical axis X of the cylindrical filter 5 so as to correspond one-to-one to the openings 5a of the cylindrical filters 5 (cylindrical filters 5). Are arranged so that the shafts Y are parallel to each other, and the compressed air H can be ejected inside the corresponding cylindrical filters 5. The ejection hole 16 is not provided with an ejection nozzle or the like for guiding the ejection direction of the compressed air H to be ejected. The details of the arrangement relationship between the ejection holes 16 and the cylindrical filter 5 will be described later.

In the present embodiment, 16 air on-off valves 12 are provided, and 16 flow pipe portions 14 are provided so as to correspond to the air on-off valves 12 respectively. In one flow pipe portion 14, 16 cylindrical filters 5 are arranged in parallel along the filter arrangement direction. In addition, each ejection hole 16 is provided at a location facing each cylindrical filter 5.
Accordingly, each operating unit 15 is controlled by the control unit so that the opening / closing state of each air on / off valve 12 corresponding to each operating unit 15 is set to the set open / closed state, so that the header pipe 13 has an open / closed state. The stored compressed air H can be ejected in a pulsed manner to the inside of each cylindrical filter 5 through each ejection hole 16. At this time, in one flow pipe portion 14, as the compressed air H flows from the proximal end portion 14A side to the distal end portion 14B side, the ejection hole 16 on the proximal end portion 14A side to the ejection hole on the distal end portion 14B side. The compressed air H is sequentially ejected in the order of 16.

  The control unit includes a central processing unit (CPU), a memory, a storage unit, and the like (not shown), and is configured by known information processing means that can execute a predetermined program and process information by the CPU. The operation of the dust collector B can be controlled.

The pressure difference detection unit includes a known pressure detection unit, and is provided in the dust-containing air introduction path 7 to detect a pressure outside the cylindrical filter 5 (on the dust-containing air introduction chamber 2 side) (see FIG. And a second pressure detector (not shown) that is provided in the purified air discharge path 8 and detects the pressure inside the cylindrical filter 5 (purified air chamber 3 side), and these first pressures Based on the detected pressure from the detection unit and the second pressure detection unit, the internal / external differential pressure of the cylindrical filter 5 can be detected. The detected internal / external differential pressure of the cylindrical filter 5 is configured to be output to the control unit.
In addition, the pressure difference detection unit includes a third pressure detection unit (not shown) that detects the pressure inside (inside) the cylindrical filter 5, and the detected pressure from the first pressure detection unit and the third pressure detection unit. Can be measured as a pressure difference between the inside and outside of the cylindrical filter 5. In addition, a predetermined pressure difference is set in advance as a reference for determining that dust has adhered to the outside of the cylindrical filter 5 and dust cannot be efficiently collected. That is, the internal / external pressure difference of the cylindrical filter 5 is a pressure loss of the dust-containing air G flowing from the outside to the inside of the cylindrical filter 5, whereas the predetermined pressure difference is It is set as the value of pressure loss when cleaning is required. The predetermined pressure difference is output to the control unit, and can be stored in advance in the storage unit of the control unit.
The purified air discharge path 8 is provided with a known flow rate detection unit (not shown) for detecting the flow rate of the purified air C discharged from the purified air chamber 3 to the external space, and the detected flow rate is controlled. It is comprised so that it may output to a part.

Next, the characteristic configuration of the dust collector B according to the present invention will be described.
In the dust collector B according to the present invention, a special configuration is adopted for the arrangement relationship between the ejection holes 16 formed in the flow pipe portion 14 and the openings 5 a of the cylindrical filter 5. This will be specifically described below.

  As shown in FIG. 3, the plurality of cylindrical filters 5 arranged corresponding to one flow pipe portion 14 are arranged so that the cylinder axis X of each cylindrical filter 5 is orthogonal to the filter arrangement direction. They are arranged in parallel. The distance P between the cylinder axes of the cylinder axes X of the adjacent cylindrical filters 5 in the filter arranging direction is set to be equal. An opening 5 a is formed at the upper end of the cylindrical filter 5. A plurality of cylindrical filters 5 are arranged in parallel so that the upper end of the opening 5 a is along the opening surface M. The intersection of the opening surface M of the opening 5a of the cylindrical filter 5 and the cylinder axis X of each cylindrical filter 5 is an opening center position K that is the center point of each opening 5a.

On the other hand, the plurality of ejection holes 16 formed in the single flow pipe portion 14 are arranged so as to be positioned above the respective cylindrical filters 5, and the axis Y of each ejection hole 16 is arranged in the filter arrangement. They are arranged in parallel so as to be orthogonal to the installation direction. The center-to-axis distance Q between the axes Y of the ejection holes 16 adjacent in the filter arrangement direction is set to be equal. The intersection (arrival point) between the opening surface M of the opening 5 a of the cylindrical filter 5 and the axis Y of each ejection hole 16 is the ejection hole axis arrival position E of each ejection hole 16.
Furthermore, the arrangement position of each ejection hole 16 in the filter arrangement direction is the axis Y (ejection hole axis) of each ejection hole 16 with respect to the cylinder axis X (opening center position K) of each cylindrical filter 5. The displacement amount ΔP _i for displacing the lead arrival position E) toward the base end portion 14A is set to a position where the displacement amount ΔP _i increases as it approaches the base end portion 14A side.
That is, each ejection hole 16 is arranged so that the displacement amount ΔP _i satisfies ΔP _i = (i−1) × A / (N−1).

More specifically, the order i corresponding to the positions of the ejection hole 16 and the opening 5a of the cylindrical filter 5 is set in order from the distal end portion 14B side to the proximal end portion 14A side of the flow pipe portion 14, and the most distal end The ejection hole 16 and the cylindrical filter 5 on the part 14B side are set first, and the order i is set so as to increase toward the base end part 14A side. Therefore, the displacement amount of the ejection hole 16 and the opening 5a of the order i (i-th) from the tip portion 14B side is ΔP _i . In the present embodiment, the ejection hole 16 and the opening 5a of the tubular filter 5 that are closest to the base end portion 14A are the 16th.

Further, the number of the plurality of cylindrical filters 5 arranged in the filter arranging direction is N, and as shown in FIG. 6, the axis Y (the ejection hole axis) in the opening 5a and the ejection hole 16 closest to the base end portion 14A. When the lead arrival position E) coincides with the cylinder axis X (opening center position K) (in the case of the arrangement position of the blowout hole and the opening of the cylindrical filter in the conventional dust collector), The opening at the arrival point S where the compressed air H ejected from the hole 16 reaches the opening surface M including the opening 5a (in this embodiment, the position where the compressed air H reaches the tip end portion 14B most). Let A be the amount of deviation toward the tip 14B side with respect to the center position K. Since this deviation amount A represents a velocity component toward the tip end portion 14B of the velocity vector of the compressed air H ejected from the ejection hole 16, by using this deviation amount A, The displacement amount ΔP _i is set so that the arrival point at which the compressed air H reaches the opening surface M of the tubular filter 5 is offset from the deviation amount from the opening center position K of the tubular filter 5 toward the distal end portion 14B. Can be set. Therefore, the displacement amount ΔP _i corresponding to the compressed air H ejected from the ejection hole 16 under a predetermined condition (pressure, speed, amount, etc.) can be set. The deviation amount A may be a deviation amount measured in advance or an empirically known deviation amount. For example, the deviation amount A may be a cylindrical filter. An appropriate size such as a diameter D of 5 may be set.

Therefore, in this embodiment, the displacement amount ΔP _i corresponds to the _first to sixteenth ejection holes 16 in the order from the distal end portion 14B side to the proximal end portion 14A side, and ΔP ₁ , ΔP ₂ , ΔP _3. , ···, ΔP _15, becomes _{ΔP 16, ΔP 1 = 0,} ΔP 2 = (A / 15), ΔP 3 = (2A / 15), ···, ΔP 15 = (14A / 15), ΔP 16 = (15A / 15). That is, the displacement amount ΔP _i of each ejection hole 16 is such that the ejection hole axial center arrival position E coincides with the opening center position K in the opening 5a and ejection hole 16 closest to the distal end 14B. Since it is set so as to sequentially increase by (A / 15) as it goes from the side toward the base end portion 14A side, the disposition position of the ejection hole 16 is displaced by the ejection hole 16 on the base end portion 14A side. It is set at a position where the amount ΔP _i becomes large. In addition, as described above, the rate at which the displacement amount ΔP _i is increased is that the compressed air H is cylindrical due to the velocity component of the compressed air H ejected from the ejection holes 16 toward the tip portion 14A in the filter arrangement direction. Even when the position reaching the opening surface 5a of the filter 5 is shifted to the tip portion 14B side from the opening center position K of the cylindrical filter 5, the shift amount to the tip portion 14B side is offset. As described above, the displacement amount ΔP _i of the ejection hole 16 toward the proximal end portion 14A side of the ejection hole axial center arrival position E with respect to the opening center position K of the cylindrical filter 5 is appropriately set. Incidentally, by using the displacement amount [Delta] P _i that is set in this way, by opening 5a and the injection holes 16 of each cylindrical filter 5 is disposed, is the arrangement interval of the ejection hole axis reaches position E The inter-axis distance Q of the axis Y is set larger than the distance P between the cylinder axes X of the cylinder axis X, which is the arrangement interval of the opening center position K.

Next, the operation when the dust collector B adopting the above configuration is operated and the ejection state of the compressed air H ejected from the ejection hole 16 will be described.
In the dust collection operation of the dust collector B, the control unit starts suction by a suction device (not shown) connected to the downstream side of the purified air discharge path 8 and connects to the upstream side of the dust-containing air introduction path 7. The dust-containing air G is introduced into the dust-containing air introduction chamber 2 in the housing 1 from an incinerator or the like (not shown). As a result, the dust-containing air G is allowed to flow from the dust-containing air introduction chamber 2 side through the cylindrical filter 5 to the purified air chamber 3 side (from the outside to the inside of the cylindrical filter 5). The dust is collected by the bug of the cylindrical filter 5 to purify the dust-containing air G and process it as purified air C. In this dust collection operation, the collected dust adheres to the outside of the bug of the cylindrical filter 5. In the dust collection operation, the control unit monitors information on the internal and external differential pressures inside and outside the cylindrical filter 5 from the pressure difference detection unit (the first pressure detection unit and the second pressure detection unit). Further, in the dust collection operation, the control unit detects the flow rate of the purified air C discharged from the purified air discharge path 8 with a flow rate detection unit, and the suction device or the like so that the detected flow rate becomes a predetermined flow rate. (Not shown).
Thereby, the dust in the dust-containing air G can be collected by the cylindrical filter 5 and the dust-containing air G can be purified well to be purified air C.

On the other hand, when this dust collection operation is continued, dust adhering to the outside of the cylindrical filter 5 increases, and dust adheres to the outside of the bug and the inside of the fiber. In such a state, pressure loss occurs in the cylindrical filter 5 and it is difficult to efficiently collect dust. Therefore, the control unit determines that such a dust layer is formed by the internal / external differential pressure of the cylindrical filter 5 detected by the pressure difference detection unit (the first pressure detection unit and the second pressure detection unit), Recognizing that the predetermined pressure difference (internal / external differential pressure) has been reached, it is determined that the cylindrical filter 5 needs to be cleaned. Note that the predetermined pressure difference is set in advance, for example, when a dust layer is formed on the cylindrical filter 5 and the dust filter cannot be efficiently collected. What was memorize | stored in the memory | storage part can be used.
In such a state, the cleaning operation of the cylindrical filter 5 is performed in a state where the dust collection operation is performed (a state where dust is collected).

As the cleaning operation, the control unit adjusts the opening of the pressure regulating valve 11 to store the compressed air H in the header pipe 13 from the compressor (not shown), and the pressure of the compressed air H in the header pipe 13. Is controlled to be about 2 kg / cm ² .

And a control part controls the opening and closing of each air on-off valve 12, and jets the compressed air H in a pulse form so that it may flow outside from the inner side of each cylindrical filter 5. FIG. At this time, the time for opening each air on-off valve 12 is set to an extremely short time of about 0.2 seconds, for example, but since the pressure of the compressed air H is about 2 kg / cm ² , the compressed air H flows through the flow pipe portion 14 through the air on-off valve 12 at a very high speed (about the speed of sound).

  4 and 5, in the dust collector B having the above configuration, the compressed air H is caused to flow through the flow pipe portion 14 and the compressed air H is ejected from the ejection holes 16 (speed). (Distribution) simulation results are shown. 4 is a simulation result in a side cross-sectional view showing the ejection state, and FIG. 5 is a simulation result in a cross-sectional view showing the ejection state at the upper end (near the opening 5a) of the cylindrical filter 5. 4 (a) and 5 (a) are simulation results showing an ejection state 0.02 seconds after the air on-off valve 12 is opened. Similarly, (b) is 0.025 seconds later. (C) is the simulation result which shows the ejection state after 0.03 second, (d) is the simulation result which shows the ejection state after 0.05 second. In the figure, the ejection state is indicated by light and shade, but the dark portion is a portion having a relatively high speed and the light portion is a portion having a relatively low speed. In the supplementary diagram shown in color, red is a portion with a high speed, and is shown as a portion with a low speed in the order of red, orange, yellow, yellow-green, green, and blue. 4 and 5, the unit of speed is m / s.

As shown in FIGS. 4 (a) and 5 (a), 0.02 seconds after the air on-off valve 12 is opened, the inside of the flow pipe portion 14 is changed from the base end portion 14A side to the tip end portion 14B side. The compressed air H flows, and the compressed air H is sequentially ejected from the ejection holes 16 on the base end portion 14A side. And since the compressed air H contains the velocity component which goes to the front-end | tip part 14B side in a filter arrangement | positioning direction, each ejection hole is in the state displaced to the front-end | tip part 14B side from the position where each ejection hole 16 was arrange | positioned. 16 reaches the opening 5a of each cylindrical filter 5 corresponding one-to-one. Since the location where the compressed air H reaches the opening 5a of each cylindrical filter 5 is in the vicinity of the cylindrical filter 5 in the filter arrangement direction (directly above the cylindrical axis), the compressed air H is introduced into each cylindrical filter 5 without any obstacles. Further, as shown in FIG. 5 (a), it is shown that a portion having a relatively high speed appears in the cylindrical filter 5, and the compressed air H is not in any manner in each cylindrical filter 5. It can be seen that it was introduced without any obstacles.
Such a state is shown in FIG. 4 (b) and FIG. 5 (b), the ejection state after 0.025 seconds, and the compression after 0.03 seconds shown in FIGS. 4 (c) and 5 (c). The same applies to the ejection state when the air H reaches the distal end portion 14B side and returns to the proximal end portion 14A side, and the ejection state after 0.05 seconds shown in FIGS. 4 (d) and 5 (d). Each compressed air H ejected from each ejection hole 16, in particular, compressed air H ejected from the ejection hole 16 on the base end portion 14 </ b> A side, is also reliably introduced into each cylindrical filter 5.

On the other hand, in FIGS. 7 and 8, in a conventional dust collector as a comparative example, the compressed air H is allowed to flow through the flow pipe portion 14 and the compressed air H is ejected from each ejection hole 16. The simulation result of a state (velocity distribution) is shown. 7 is a simulation result in a side cross-sectional view showing the ejection state, and FIG. 8 is a simulation result in a cross-sectional view showing the ejection state at the upper end (near the opening 5a) of the cylindrical filter 5. 7 (a) and 8 (a) are simulation results showing an ejection state 0.02 seconds after the air on-off valve 12 is opened. Similarly, (b) is 0.025 seconds later. (C) is the simulation result which shows the ejection state after 0.03 second, (d) is the simulation result which shows the ejection state after 0.05 second. In the figure, the ejection state is indicated by light and shade, but the dark portion is a portion having a relatively high speed and the light portion is a portion having a relatively low speed. In addition, in the supplementary diagram shown in color, red is a portion with a high speed, and is shown as a portion with a low speed in the order of red, orange, yellow, yellow-green, green, and blue. In FIGS. 7 and 8, the unit of speed is m / s.
In this conventional dust collector, as shown in FIG. 6, the cylinder axis X of each cylindrical filter 5 and the axis Y of each ejection hole 16 are set at the same position in the filter arrangement direction.

  As shown in FIGS. 7A and 8A, the compressed air H includes a velocity component toward the tip portion 14B side in the filter arrangement direction, and therefore the position where each ejection hole 16 is arranged. In the state displaced from the tip portion 14B to the tip end portion 14B, the upper end of each cylindrical filter 5 corresponding to each ejection hole 16 on a one-to-one basis is reached. However, the location where the compressed air H has reached the upper end of each cylindrical filter 5 is a position displaced toward the tip end portion 14B from the cylindrical axis X of the cylindrical filter 5 in the filter arrangement direction. The compressed air H collides with the periphery of the opening of the upper end portion of each cylindrical filter 5, and it is difficult to say that the compressed air H is sufficiently introduced into the cylindrical filter 5. In particular, as shown in FIG. 7A, the compressed air H is hardly introduced into the cylindrical filter 5 on the base end portion 14A side (the right side in FIG. 7). Such a state is shown in FIGS. 7B and 8B, the ejection state after 0.025 seconds, and the compression after 0.03 seconds as shown in FIGS. 7C and 8C. The same applies to the ejection state when the air H reaches the distal end portion 14B side and returns to the proximal end portion 14A side, and the ejection state after 0.05 seconds shown in FIGS. 7 (d) and 8 (d). However, in particular, the compressed air H ejected from the ejection holes 16 arranged on the base end portion 14 </ b> A side is hardly introduced into each cylindrical filter 5.

Therefore, in the dust collector B according to the present invention, the cylinder axis X (opening center position K) of the cylindrical filter 5 and the axis Y (ejection hole axis arrival position E) of each ejection hole 16 as described above. ) And the displacement amount ΔP _i are set appropriately, the compressed air H ejected from each ejection hole 16, in particular, the ejection hole 16 from the base end portion 14 </ b> A side, is surely entered into each cylindrical filter 5. Can be introduced. Thereby, in the cleaning operation, the compressed air H can surely flow from the inside to the outside of each cylindrical filter 5, and the compressed air H allows the cylindrical filter 5 (in particular, the cylindrical shape on the base end portion 14 </ b> A side). It is possible to surely remove dust adhering to the outside of the filter 5).

[Another embodiment]
(1) In the above embodiment, the distance P between the cylinder axes of the cylindrical filters 5 adjacent in the filter arranging direction is set to be equal, and the axis of the ejection hole 16 adjacent in the filter arranging direction is set. The center-to-center distance Q is set to be equal, and the displacement amount ΔP _i increases by (A / (N−1)) as it goes from the distal end portion 14B side to the proximal end portion 14A side. Set to. However, the displacement amount ΔP _i can be appropriately set so as to increase toward the base end portion 14A, and the compressed air H ejected from the ejection hole 16 can be reliably introduced into the cylindrical filter 5. If it is a structure, it can employ | adopt without a restriction | limiting in particular.
For example, one or both of the distance P between the cylinder axes of the cylindrical filters 5 adjacent in the filter arrangement direction and the distance Q between the axes of the ejection holes 16 adjacent in the filter arrangement direction are unequal intervals. In such a state, the displacement amount ΔP _i can be set so as to increase as it approaches the base end portion 14A side.

(2) In the above embodiment, each ejection hole 16 and each cylindrical filter 5 are disposed so that the displacement amount ΔP _i satisfies ΔP _i = (i−1) × A / (N−1). When the configuration in which most of the compressed air H ejected from the ejection hole 16 is introduced into the cylindrical filter 5 is sufficient, the configuration is not particularly limited to this configuration. For example, each of the opening 5a and the ejection hole 16 is arranged so as to satisfy the relationship of ΔP _i = (i−1) × A / (N−1) ± R and 0 ≦ R ≦ (D / 2). A configuration can also be adopted. D is the diameter (inner diameter) of the cylindrical filter 5. In this case, the arrangement position of each ejection hole 16 and each cylindrical filter 5 is determined based on the displacement ΔP _i = (i−1) × A / (N−1) in the filter arrangement direction. Can be set so as to be within a range shifted by a radius R (± D / 2) of the angle, so that the amount of displacement ΔP _i is given a certain degree of freedom, but the injected compressed air H can be reliably injected into the cylindrical filter 5. It can be set as the structure to introduce.

(3) In the above embodiment, the case where the cylinder axis X of the cylindrical filter 5 is orthogonal to the filter arrangement direction and the axis Y of the ejection hole 16 is orthogonal to the filter arrangement direction has been described. Even when the cylinder axis X and the axis Y are inclined with respect to the filter arrangement direction, the cylinder is set by increasing the displacement ΔP _i closer to the base end portion 14A side. If it is the structure which can introduce reliably the compressed air H ejected from the ejection hole 16 in the shape filter 5, it can employ | adopt without a restriction | limiting especially.
For example, when the ejection hole 16 is provided in the flow-through pipe portion 14, it is formed so as to be inclined toward the tip portion 14 </ b> B side in the filter arrangement direction, and the axial center Y of the ejection hole 16 is inclined toward the tip portion 14 </ b> B side. Or when the tubular filter 5 is disposed on the partition wall 4, the tubular filter 5 is provided in a state inclined to the distal end portion 14B side in the filter disposing direction, and the cylindrical axis X of the tubular filter 5 is disposed on the distal end portion 14B side. The present invention can be applied satisfactorily even when it is inclined to the angle.

(4) In the above-described embodiment, the so-called pulse-type dust collector B that performs the cleaning operation of the cylindrical filter 5 in a state in which the dust collection operation is performed (a state in which dust is collected) has been described. However, the present invention is not particularly limited to this configuration. For example, the present invention can be applied to a backwash type dust collector that performs a cleaning operation after stopping the dust collection operation.

(5) In the above-described embodiment, in the configuration in which the displacement amount ΔP _i is set so as to increase toward the base end portion 14A side, the opening 5a and the ejection hole 16 that are closest to the distal end portion 14B side are the first (i = The example employ | adopted as 1) was shown. However, the opening 5a and the ejection hole 16 employed as the first (i = 1) are not the opening 5a and the ejection hole 16 (the first opening 5a and the ejection hole 16) located closest to the distal end portion 14B. The opening 5a and the ejection hole 16 positioned on the base end portion 14A side of the opening 5a and the ejection hole 16 may be employed. For example, as the opening 5a and the ejection hole 16 employed as the first (i = 1), the second opening 5a and the ejection hole 16 when counted from the opening 5a and the ejection hole 16 on the most distal end portion 14B side. Or it can be set as the 3rd opening part 5a, the ejection hole 16, etc. As shown in FIG. Thereby, when the compressed air H ejected from the ejection hole 16 on the tip end portion 14B side is appropriately introduced into the opposed cylindrical filter 5, the displacement amount ΔP _i is set for the ejection hole 16. Therefore, the compressed air H can be more reliably introduced into the cylindrical filter 5 while reducing the modification of the apparatus configuration.

(6) In the above embodiment, the displacement amount ΔP _i is increased at a constant rate from the distal end portion 14B side to the proximal end portion 14A side. However, the displacement amount ΔP _i is as large as the ejection hole 16 on the proximal end portion 14A side. As long as the position is set to be larger, the configuration is not particularly limited. For example, among the plurality of ejection holes 16, a displacement component may be set for each ejection hole 16 in consideration of a speed component toward the distal end portion 14 </ b> B side in the filter arrangement direction. Further, the plurality of ejection holes 16 are divided into a plurality of groups, and the displacement amount of the ejection holes 16 in the group is the same, but the displacement amount for each group becomes larger as the ejection holes 16 of the group on the base end portion 14A side. It can also be set as follows.

(7) In the above-described embodiment, the configuration in which the header pipe 13 that stores the pressure air from the compressor or the like is used as the compressed air source is described. However, the configuration is not limited to this configuration. It is good also as a structure which employ | adopts the structure which uses etc. as a compressed air source, and supplies the compressed air H to the flow pipe part 14 directly from the said compressed air source via an on-off valve.

  As described above, while the apparatus configuration is simple and the manufacturing cost can be reduced, the compressed air ejected from the ejection holes is reliably introduced into the cylindrical filter, and the dust adhering to the cylindrical filter is removed. It was possible to provide a dust collector that can be more efficiently cleaned.

DESCRIPTION OF SYMBOLS 1 Case 2 Dust-containing air introduction chamber 3 Purified air chamber 4 Partition wall 5 Cylindrical filter (filter mechanism)
5a Opening 6 Jetting mechanism 12 Air open / close valve (open / close valve)
13 Header pipe (compressed air source)
14 Flow pipe part (spout mechanism)
14A Base end part 14B Front end part 16 Ejection hole (ejection mechanism)
B Dust collector H Compressed air X Cylindrical tube cylinder axis Y Injection hole axis M Opening surface K Opening center position E Injection hole axis arrival position N Number of cylindrical filters D Diameter of cylindrical filter A Most Reaching the compressed air ejected from the ejection hole to reach the opening surface including the opening when the ejection hole axial center arrival position is matched with the opening center position in the opening and ejection hole on the base end side Deviation amount i toward the distal end side with respect to the center position of the opening of the point Arbitrary order when ordering the opening and the ejection hole located on the proximal end side from the specific opening and ejection hole located on the distal end side ΔPi displacement

Claims (4)

A housing whose interior is partitioned into a dust-containing air introduction chamber and a purified air chamber by a partition wall;
A filter mechanism that is provided on the partition wall and collects dust contained in the dust-containing air flowing from the dust-containing air introduction chamber side to the purified air chamber side in the housing;
Dust collection device comprising: a jetting mechanism that cleans dust collected by the filter mechanism by jetting compressed air in a pulse form from the purified air chamber side to the dusty air introduction chamber side through the filter mechanism A device,
The filter mechanism is configured by arranging a plurality of bottomed cylindrical filters in parallel along a predetermined filter arrangement direction,
The ejection mechanism has a cylindrical passage formed so as to extend in a state along the filter disposition direction from a proximal end side connected to a compressed air source via an on-off valve toward a distal end side. A plurality of jet holes corresponding to the respective openings of the plurality of cylindrical filters are arranged in parallel on the tube wall of the flow pipe portion,
Displacement of the injection hole axial center arrival position, which is the arrival point of the axial center of the injection hole with respect to the opening surface including the opening, toward the proximal end side with respect to the opening center position that is the central point of the opening A dust collector in which each of the opening and the ejection hole is arranged so that the amount thereof becomes larger as it is closer to the base end side. The displacement amount at the i-th opening and the ejection hole from the distal end side is ΔP _i , the number of the plurality of cylindrical filters is N, the diameter of the cylindrical filter is D, and the most proximal end side is In the opening and the ejection hole, when the jet hole axial center arrival position is made coincident with the central position of the opening, the compressed air ejected from the ejection hole reaches the opening surface including the opening. The amount of shift to the tip end side with respect to the center position of the opening is A,
ΔP _i = (i−1) × A / (N−1) ± R
2. The dust collector according to claim 1, wherein each of the opening and the ejection hole is disposed so as to satisfy a relationship of 0 ≦ R ≦ (D / 2).   The plurality of cylindrical filters are arranged in parallel so that the cylinder axes are equidistant and parallel to each other, and the plurality of ejection holes are arranged in parallel so that the axes are equidistant and parallel to each other The dust collector according to claim 1 or 2, wherein In the opening and the injection hole on the most distal end side, the injection hole axial center arrival position and the opening center position are matched,
The arrangement interval of the plurality of ejection hole axial center arrival positions is set to be larger than the arrangement interval of the plurality of opening center positions, and the displacement amount is increased as it is closer to the base end side. Dust collector.