JPH0731820A - Self-cleaning type bag filter dust collector - Google Patents

Abstract

PURPOSE:To regenerate a filtering surface wall so as to bring the same to a proper state and to enhance the capacity of the dust collector, in a self- cleaning type bag filter dust collector by blowing jet air into a bag filter to perform the dedusting of a filter element, by certainly shaking down the dust bonded to the upper peripheral surface of the filter element. CONSTITUTION:Air receiving elements 21 are provided to the inside of a holding frame 12 holding the filter element 11 of a bag filter 5 in a tensioned state at a plurality of places in an up-and-down direction so as to traverse the space in the frame 12 and dedusting is performed by the vibration action due to the collision impact with jet air and the blowing-through action of air streams changed in direction by the air receiving elements 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-cleaning type bag filter dust collector which ejects jet air into the bag filter to remove dust from the filter element. It is an improved version.

[0002]

2. Description of the Related Art As a conventional device of this type, for example, a bag filter dust collector disclosed in JP-A-63-93318 is known. Further, the basic structure of the holding frame of the bag filter is known in the above-mentioned publication and JP-A-63-23709. In many cases, the holding frame is composed of an annular shape-retaining frame and a vertical frame fixed around the shape-retaining frame, and has a tubular frame shape. The filtration wall is stretched and held by the vertical frame.

[0003]

In the bag filter dust collector, the filtering area is increased by setting the axial dimension of the bag filter large, and the axial length reaches 5 m at maximum. In order to remove the dust adhering to the slender bag filter, dust is removed by ejecting pulsed jet air from the opening at one end of the bag filter. Not not. On the bag end side farthest from the opening, dust adhering to the filter element can be reliably removed, but dust cannot be removed as the bag end approaches the opening side. There is no difference in the result even if the number of jets of jet air and the jet pressure are increased. There is a dust removal mechanism in which a venturi cylinder is provided in the opening and the ambient air is entrained by jet air and blown into the bag filter, but even with this, the same tendency as described above is exhibited, and the dust removal effect cannot be improved to the left.

Considering the above matters, it is supposed that the jet air collides with the back end wall of the bag filter to expand the filter surface wall around it and remove dust, and the upper side of the bag filter is I have to say that I am passing by. Thus, in the conventional device, since the dust removal from the filter element is insufficient, the substantial filtration area is reduced,
As a result, the dust collector performance is deteriorated.

An object of the present invention is to reliably remove dust from a filter element so that the condition of a filter surface wall can always be maintained in an appropriate condition, and to improve the dust collecting performance of this type dust collector. is there.

[0006]

In the present invention, the holding frame is mechanically vibrated by utilizing the flow action of the jet air jetted to the bag filter, and a part of the jet air is directed to the outer surface of the filtration surface wall. Dust is removed by blowing it through. More specifically, the bag filter dust collector of the present invention has a group of bag filters 5 inside the housing 1.
And a dust-removing mechanism 6 for ejecting dust-removing jet air A into each bag filter 5, and the bag filter 5 has a bag-shaped filter element 11 having an opening at one end, and this element 11 A holding frame 12 which is inserted into the holding frame 12 to hold the filter element 11 in a stretched state, and the wind blowers 21 are arranged in a plurality of upper and lower positions inside the holding frame 12 so as to traverse the space in the frame. It is a requirement. More specifically, it is possible to adopt a configuration in which the air blower 21 is formed by assembling a plurality of transverse rods 22 in an intersecting shape, or a configuration in which the air blower 21 is cantilevered with respect to the holding frame 12.

[0007]

In the state of removing dust, the jet air-A goes straight inside the bag filter 5. At this time, since the air blower 21 is provided inside the holding frame 12 so as to traverse the space inside the frame, a part of the jet air-A is blown by the air blower 21.
The holding frame 12 is vibrated via the air blower 21 by the flow energy. At the same time, the jet air-A that has collided with the air blower 21 changes its flow direction, and a part or most of it blows through the filter surface wall from the inside to the outside. Therefore, if the air blower 21 is arranged corresponding to a place where it is difficult to remove dust, the dust attached to the filter element 11 can be forcibly removed. Holding frame 1
According to the wind receiving member 21 which is cantilevered with respect to 2, the flow energy of the jet air A can be efficiently converted into mechanical vibration.

[0008]

As described above, according to the present invention, the air blowers 21 are provided at a plurality of upper and lower positions inside the holding frame 12 constituting the bag filter 5, and the jet air A is jetted into the bag filter 5. At that time, part of the wind blower 21
The holding frame 12 is vibrated by colliding with, and the colliding airflow is blown out to the outer surface of the filter to remove dust adhering to the filter element 11. As a result, it is possible to surely remove dust not only on the inner side of the filter element 11 but also on the opening side thereof, and the state of the filtration surface wall during regeneration can always be optimized to improve the dust collector performance.

[0009]

1 to 4 show an embodiment of a bag filter dust collector according to the present invention. In FIG. 2, the bag filter dust collector has a partition wall 2 inside the hollow housing 1.
Then, the dust collecting chamber 3 occupying the majority and the exhaust chamber 4 on the upper side are partitioned, and a group of bag filters 5 is inserted into the dust collecting chamber 3 from the side of the exhaust chamber 4 and the upper end thereof is fixed to the partition wall 2. , Exhaust chamber 4
A dust removing mechanism 6 is provided inside the. At the center of the bottom wall of the dust collection chamber 3, a dust extraction valve 7 that discharges dust separated from the dust-containing air is provided. The dust-containing air is sent into the dust collection chamber 3 through the inlet 8 by an air supply device (not shown) and is filtered while passing through the bag filter 5 from the outer surface to the inner surface. The filtered clean air is taken out of the machine through an outlet 4 provided at the center of the upper wall of the exhaust chamber 4.

In FIG. 1, the bag filter 5 comprises a bag-shaped filter element 11 having one end opened, and a cylindrical frame-shaped holding frame 12 for holding the element 11 in an expanded state. The bag filter 5 is made of non-woven fabric made of heat-resistant nylon, polyester, polypropylene fiber or the like. The holding frame 12 includes a base 13 at the upper end and a bottom lid 1 at the lower end.
4, and the circular shape-retaining frames 15 provided at regular intervals in the vertical direction are used as shape-retaining bodies, and eight stringers 16 are arranged at equal intervals along the periphery of these shape-retaining bodies. It is fixed by welding. The holding frame 12 is covered with the filter element 11 from the side of the bottom cover 14, and after covering the entire frame peripheral surface of the holding frame 12, the opening edge thereof is fixed to the mouthpiece 13 with a clasp (not shown). The diameter and the vertical length of the bag filter 5 vary depending on the application, the amount of treated air, etc.
The diameter is often 160 mm or less, and the vertical length is often 5 m or less.

The bag filters 5 are arranged in rows and columns in the housing 1 to clean the air by filtering the dust contained in the dust-containing air, and the dust is useful for grains or powder cement. If it is a material,
This is collected and used. A dust removing mechanism 6 is provided to remove dust adhering to the surface of the bag filter due to filtration and to regenerate the filtration surface wall to an appropriate state. This arranges the blow tube 17 for each row of the bag filter 5,
A nozzle 18 for cleaning is provided on the lower surface of the blow tube 17 so as to correspond to the upper end opening of each bag filter 5, that is, the air outlet, and each blow tube 17 is connected to an electromagnetic opening / closing valve and a header pipe (not shown). It is connected to the compressed air supply source 19 via the above. When the electromagnetic on-off valve corresponding to each blow tube 17 is opened and operated, the bag filter row located immediately below the blow tube 17 can be cleaned. The valve opening time at this time is about 0.05 to 0.1 seconds, and pulsed jet air A is ejected from each nozzle 18 toward the inside of the bag filter 5.

[0012] With only the jet air-A, only the portion near the lower end of the filter element 11 is surely dedusted. In order to compensate for this, as shown in FIG.
Blowers 21 are provided at a plurality of upper and lower positions inside the. The wind receiver 21 is composed of a pair of cross rods 22 and 22 made of a metal wire that crosses the space inside the frame along a diametrical line. Both cross rods 22 are assembled in an orthogonal posture and their intersections are welded and fixed. The wind receiver 21 is disposed near the center of the die 13 and the shape-retaining frame 15 or the vertically adjacent shape-retaining frames 15 and 15 in the vertical direction.
The free end of each transverse rod 22 is welded and fixed to the four stringers 16. Further, the vertically adjacent air blowers 21, 21 are arranged such that the phase positions of the free ends of the transverse rods 22 are shifted by 45 degrees, and the lower part is located up to a position where dust removal by the jet air-A is insufficient. Deploy.

Next, the operation of the air blower 21 will be mainly described. The internal pressure of the jet air-A jetted from the nozzle 18 at the time of dust removal is, for example, 6 to 7 kg / cm @ 2, and at the same time as jetting from the nozzle 18, it goes straight at a high speed. Therefore, when the jet air-A is jetted into the bag filter 5, the jet air-A will soon collide with the uppermost wind receiver 21 and further collide with the respective next and subsequent wind receivers 21 to the inner bottom of the bag filter 5. The dust that adheres to the lower end portion of the bag filter 5 is wiped off mainly by the collision impact of the air flow and the expansion action as in the conventional device.

As described above, Jet Air-A moves at a high speed. Therefore, the wind receiver 21 that has collided with the jet air-A is excited by a collision impact and propagates this vibration to the stringer 16. That is, the stringer 16 is vibrated and shaken from the upper side to the lower side with a slight time difference. Moreover, since the phase position of the fixed end of the transverse rod 22 is different for each stage, the adjacent stringers 16 are alternately vibrated and the filter element 11 closely contacting the outer surface thereof is flared in the radial direction. The dust adhering to the outer surface is removed.

On the other hand, as shown in FIG. 3, the jet air-A colliding with each air blower 21 is guided by the transverse rod 22 to change its flow direction, and a part or most of it is directed to the inner surface of the filter wall. The filter element 11 collides and blows to the outer surface of the filter element 11 while expanding the filter element 11 toward the outer surface in the radial direction as shown by an imaginary line. Due to the blow-through and the expansion deformation of the filter element 11, the dust adhering to the filter surface wall is forcibly removed. Therefore, Jet Air-A
When the dust is removed by the method, the dust adhering to the entire outer surface of the filter element 11 can be surely removed, and the filtration surface wall can be regenerated to an appropriate state.

4 to 7 show a modification of the air blower 21. In the wind receiver 21 shown in FIG. 4, the cross bar 22 is formed of a plate material instead of a metal wire rod, and each plate member is assembled in a cross shape to form the wind receiver 21, and one cross member. Only the one end of the rod 22 is welded and fixed to the stringer 16, and the wind receiver 21 is supported by a cantilever, which is different from the above-described embodiment. The cantilever-supported wind receiver 21 easily vibrates, and in particular, even when the jet pressure of the jet air A is low, its flow energy can be efficiently converted into mechanical vibration.

In the wind receiver 21 shown in FIG. 5, the transverse rod 22 is formed of a plate material similarly to the wind receiver 21 described in FIG. 4, and a flow block 23 having a sharp upper and lower portion is fixed to the intersection, and the cross block 22 is crossed. This is to avoid air flow interference in the part.

The air blower 21 shown in FIG. 6 has a single transverse rod 22.
It consists of, and fixes one end of the cross bar 22 to each stringer 16,
The projection is located near the center of the space inside the frame. The transverse rods 22 are fixed at different height positions along the axial direction. That is, it is attached in a spiral shape to the group of stringers 16. As you can see from this example,
In this specification, the wind receiver 21 traverses the space in the frame, as long as the cross bar 22 has a length to reach almost the center of the axis of the holding frame 12, it is not necessary to completely traverse the space in the frame. .

The blower body 21 shown in FIG. 7 comprises a pair of transverse rods 22 bent in an arc shape, and the transverse rods 22 are welded to the stringer 16 with their arcuate portions facing each other at the same height. It is a thing. In this way, the transverse rod 22 can be arranged so as not to follow the diameter line. In addition to the above, the wind receiver 21 may be formed in a Y shape or an L shape in plan view, and the shape thereof is not limited. The arrangement form in the vertical direction with respect to the holding frame 12 is not limited to the embodiment. If you need
The wind receivers 21 having different structures may be mixed in one holding frame 12. The bag filter 5 may have an envelope structure other than the cylindrical shape.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a bag filter according to the present invention.

FIG. 2 is a longitudinal sectional view showing the principle structure of a self-cleaning type bag filter dust collector.

FIG. 3 is a cross-sectional plan view of the bag filter showing the action of the air receiving body.

FIG. 4 is a vertical cross-sectional front view of a bag filter showing a modification of a wind receiver.

FIG. 5 is a perspective view showing a modification of the wind receiver.

FIG. 6 is a cross-sectional plan view of a holding frame showing a modified aspect of a wind receiver.

FIG. 7 is a cross-sectional plan view of a holding frame showing a modified form of a wind receiver.

[Explanation of symbols]

5 ………… Bag filter, 6 ………… Dust removal mechanism, 11 ……
… Filter element, 12 ……… Holding frame, 15 ………
Shape-retaining frame, 16 ... Longitudinal member, 19 ... Compressed air supply source, 21 ... Wind receiver, 22 ... Cross bar.

Claims (3)

[Claims] 1. A self-cleaning bag filter having a group of bag filters 5 inside a housing 1 and a dust removing mechanism 6 for ejecting a dust removing jet air A into each bag filter 5. The bag filter 5 is a dust collector, and the bag filter 5 includes a bag-shaped filter element 11 having one end opened, and a holding frame 12 that is inserted into the element 11 to hold the filter element 11 in an expanded state.
A self-cleaning bag filter dust collector in which the air blowers 21 are arranged at a plurality of upper and lower positions inside the holding frame 12 so as to traverse the space inside the frame. 2. The self-cleaning apparatus according to claim 1, wherein the air blower 21 is formed by assembling a plurality of transverse rods 22 in an intersecting manner.
Ning type bag filter dust collector. 3. The self-cleaning type bag filter dust collector according to claim 1, wherein the air blower 21 is cantilevered with respect to the holding frame 12.