JPH07178304A - Self-cleaning dust collector and dust collecting deflector of the collector - Google Patents

Abstract

PURPOSE:To obtain a dust collecting deflector capable of surely removing the dust on the area from which dust is hardly removed such as the area close to the outlet opening of a filter, applicable to various filters and excellent in wide applicability in a dust collector for removing the dust on a filter element by blowing an air jet into the filter. CONSTITUTION:This deflector 24 consists of a cylindrical frame-shaped support 25, a group of deflecting bodies 26 fixed to the support 25 and a fixture 27. The deflector 24 is inserted into a filter 5 from its outlet opening, and an air jet is deflected toward the area where dust is hardly removed by the deflecting body 26 to prevent the jet from passing by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-cleaning dust collector for ejecting a jet stream into a filter to remove dust, and a dust-removing deflector for the dust collector.

[0002]

2. Description of the Related Art A self-cleaning dust collector is known, for example, from Japanese Patent Laid-Open No. 63-93318. There, pulsed jet air is ejected from the outlet opening of the filter to remove dust.However, in the area near the outlet opening, the jet air passes through the inner space of the filter, so sufficient desorption is performed only on the far end side of the filter. No dust effect can be obtained. When the venturi is loaded into the outlet opening, the surrounding space of the venturi is in a negative pressure state and tends to draw ambient air into the inside of the filter, so that dedusting in the vicinity of the outlet opening becomes more difficult. This tendency is particularly strong in long hollow filters.

A filter that solves such a problem is already on the market (unknown document). This is because the columnar body is integrally provided inside the filter, the internal volume is reduced by the volume occupied by the columnar body, and the jet air colliding with the upper end of the columnar body is reflected upward to uniformly remove dust. The columnar body is erected from the inner bottom of the cage fitted inside the filter element toward the outlet opening, and the upper end thereof is rounded into a dome shape.

[0004]

SUMMARY OF THE INVENTION In the above filter,
Since the airflow reflected by the columnar body and the jet air following it interfere with each other, dust cannot be sufficiently removed in the region close to the outlet opening.

The columnar body is formed as a cylindrical body, and is erected from the inner bottom of the cage toward the outlet opening. Therefore, there is a limit to the length of the applicable filter, 1.5m
It cannot be applied to filters exceeding 0. For example, there is a cylindrical filter whose axial length reaches 7 m. However, in such a long filter, it is inevitable that the columnar body is bent and deformed, and uneven dust removal is likely to occur. By increasing the rigidity of the columnar body,
It is not impossible to avoid flexural deformation, but it is too costly and practically problematic. As represented by a ceramic filter, a shape-preserving filter does not require a shape-retaining cage, but in such a filter, it is difficult to support the columnar body in a vertically long position. Of course, the columnar body cannot be added to an existing filter.

In the long filter as described above, the impact of jet air repeatedly acting on the filter often causes damage to the filter element and the cage for supporting the shape of the filter element. The filter element made of cloth bursts near the bottom of the filter.
In addition, the repeated impact forces cause fatigue failure at the top of the cage, causing the cage and filter element to fall out of the filter mounting wall.

An object of the present invention is to provide a self-cleaning dust collector capable of uniformly removing dust over the entire peripheral surface of the filter and maintaining the filter wall in an appropriate state without clogging to improve dust collecting performance. It is in. Another object of the present invention is to make it possible to configure a filter provided with a deflector regardless of the type and size and to enable uniform dust removal in various dust collectors provided with a hollow filter. is there. Another object of the present invention is to provide a dedusting deflector that can be additionally equipped on an existing filter to perform uniform dedusting. Another object of the present invention is to prevent the filter from being damaged by the impact of the dust-removing jet air and to improve the durability of the filter.

[0008]

The dust collector of the present invention comprises a group of hollow filters 5 provided inside a housing 1.
And the dust removal mechanism 6 for ejecting the dust removal jet airflow A into each filter 5, and in the inner space of the filter 5, the jet airflow A that has collided is deflected and guided toward the filtration wall. The deflector 24 is provided so as to extend inward from the outlet opening of the filter 5. Specifically, the deflector 24 includes a support 25 and a group of the deflectors 26 fixed to the support 25 along the longitudinal direction of the support 25, and the filter element 11 of the filter 5.
The shape-retaining cage 12 is inserted into the inside of the cage, and a shielding plate 28 for shielding the jet airflow A that is about to collide directly with the rear end wall 14 of the cage 12 is provided at the inner rear end of the deflector 24. In addition, the deflector 24 is formed separately from the filter 5, and is provided so that it can be inserted into and removed from the filter 5.

The dedusting deflector of the present invention is a deflector which is inserted and fitted inward from the outlet opening of a hollow filter 5 to guide the impinging jet airflow A toward a filtering wall. Two
4, the deflector 24 includes a supporting body 25, a group of the deflecting bodies 26 fixed to the supporting body 25 along the longitudinal direction of the supporting body 25, and one end of the supporting body 25. , A fixture 2 that is received and supported by the peripheral wall of the outlet opening of the filter 5.
It is characterized by including 7 and.

[0010]

In the state of performing dust removal, the jet airflow A ejected from the dust removal mechanism 6 goes straight inside the filter toward the inner back end. At this time, since the deflector 24 is provided in the filter from the outlet opening thereof toward the inner depth, the jet airflow A moves to the inner depth while colliding with the deflector 24. The impinging jet airflow A is forcibly deflected and guided toward the filter wall to expand the filter element 11 located around the jet wall A, blow off the filter wall 11 and blow off dust accumulated on the outer surface of the filter element 11. Therefore, if the deflector 24 is provided so that the jet airflow A collides with the deflector 24 at a place where it is difficult to remove dust, dust can be uniformly removed.

Since the deflector 24 is provided so as to be inserted and fitted inward from the outlet opening side of the filter 5 toward the inside, the dust adhering to the filter 5 along the advancing direction of the jet airflow A is discharged. The dust can be removed in order from the side. This means that when the filter 5 is arranged vertically, it is possible to prevent reattachment of dust separated by the jet airflow A. It also helps to gradually disperse the jet airflow A and prevent its impact force from concentrating on the inner bottom of the filter.

The support body 25 and a group of the deflecting bodies 26 fixed to the support body 25 constitute a deflector 24.
In the configuration in which the deflector 24 is disposed inward from the outlet opening, the deflector 24 can be supported in a suspended manner like the shape-retaining cage 12, and therefore, even if the long filter 5 is used, no problem occurs. Without turning, the deflector 24 can be maintained in a predetermined mounting posture and uniform dust removal can be performed.

A shielding wall 28 provided at the inner rear end of the deflector 24
Prevents the jet airflow A from directly impinging on the rear end wall 14 of the cage 12, and prevents the collision impact of the jet airflow A which repeatedly acts on the cage 12 directly.

According to the deflector 24 which is provided so as to be insertable into and removable from the filter 5, the deflector 24 can be replaced and mounted according to the object of filtration and the load on the filter wall.

In the deflector 24 for dedusting, which is composed of a cylindrical frame-shaped support 25, a group of deflection bodies 26 provided on the support 25, and a fixture 27 provided at one end of the support 25. According to this, the mounting tool 27 can be received and supported by the peripheral wall of the outlet opening, the partition wall 2, etc. in a state in which the deflector 24 is fitted into the filter from the outlet opening of the filter 5, so that the existing filter 5 It can be applied even if there is no problem. The filter 5 having no cage 12 such as a ceramic filter or a metal filter can also be applied.

[0016]

As described above, according to the present invention, the deflector 24 is inserted from the outlet of the filter 5 toward the inner side.
Is provided so that the jet airflow A colliding with the deflector 24 can be forcibly deflected and guided toward the filter wall. Therefore, for example, even in a region near the outlet opening, which is difficult to remove dust in the conventional device. It is possible to reliably remove dust by the jet airflow A guided in the direction. Therefore, according to the dust collector of the present invention, the entire peripheral surface of the filter 5 can be uniformly dedusted, and the dust collecting performance can be improved by maintaining the filter wall in an appropriate state without clogging. The dust adhering to the filter 5 can be removed in order from the outlet opening side toward the inner back side, so that in the vertically arranged filter 5, reattachment of the dust separated from the filter peripheral surface can be eliminated. The jet airflow A is collided with the deflector 24 to disperse the energy of the airflow to prevent the collision impact from concentrating on the inner bottom portion of the filter. Further, a shielding wall 28 is provided at the inner back end of the deflector 24. ,
Since the jet airflow A is prevented from directly impinging on the rear end wall 14 of the cage 12, the filter element 11 made of cloth is ruptured at the bottom of the filter, or the upper end of the cage 12 is damaged due to fatigue failure, and the cage 12 is damaged. Also, the accident that the filter element 11 falls off can be eliminated, and the filter 5
The durability of can be improved.

Since the deflector 24 is provided from the outlet opening of the filter 5 toward the inner side, the cage 12 of the filter 5 and the
The deflector 24 can be mounted in various mounting configurations by utilizing a machine wall that supports the filter 5. That is, the filter 5 including the deflector 24 can be configured regardless of the difference in the type and size of the filter 5, and dust can be uniformly removed in all types of dust collectors including the hollow filter 5. It became possible to.

Further, according to the dedusting deflector of the present invention, the deflector 24 is inserted into the filter 5 and the support 2 thereof is provided.
The fixture 27 provided at one end of the filter 5 is received and supported by the peripheral wall of the outlet opening of the filter 5, the partition wall 2 and the like,
Since the deflector 24 can be attached to the filter 5, even the filter 5 of the existing dust collector can be additionally equipped with the deflector 24 to uniformly remove dust, and the cage 12 is not provided. Even the filter 5 can be applied without any trouble. Since the existing filter 5 can be used as it is, the cost required for replacing the filter 5 can be reduced as compared with the conventional filter in which the columnar body is integrally provided in the filter. further,
In the conventional product in which the columnar body is provided inside the filter, it is necessary to replace the entire filter together with the columnar body at the time of updating due to clogging or damage of the filter. However, since the deflector 24 of the present invention can be repeatedly used, the dust collector The increase in running cost can be suppressed and the dust collection performance can be improved.

[0019]

1 to 4 show an embodiment in which the present invention is applied to a bag filter dust collector. In FIG. 2, reference numeral 1
Is a housing of the dust collector, 2 is a partition wall that divides the interior of the housing 1 into a lower dust collecting chamber 3 and an upper exhaust chamber 4, and 5 is a cylindrical filter. A group of filters 5 are mounted on the partition wall 2, and most of the peripheral surface thereof is in the dust collecting chamber 3. Inside the exhaust chamber 4, a dust removal mechanism 6 for ejecting a dust removal jet stream A toward the inside of the filter 5 for each filter row.
Is provided.

The gas containing dust is supplied into the dust collecting chamber 3 through the inlet 8 by an air supply device or an air intake device (not shown), and is filtered while passing through the hollow filter 5 from the outer surface to the inner surface. The filtered clean gas is discharged through the outlet 9 provided in the exhaust chamber 4.
Is taken out of the plane. At the center of the bottom wall of the dust collecting chamber 3, there is provided an extraction valve 7 for discharging the separated dust in an airlocked state.

In FIG. 1, the filter 5 comprises a bag-shaped filter element 11 having one end opened, and a cylindrical frame-shaped cage 12 that retains the shape of the element 11. The filter element 11 is made of heat-resistant nylon, polyester,
It is made of non-woven fabric made of synthetic fiber such as polypropylene. The cage 12 includes a base 13 at the upper end and a rear end wall 1 at the lower end.
A stringer 16 is fixed between the two, and circular rings 15 are fixed in the middle of the stringer 16 at regular intervals. In addition, the rear end wall 14 is formed in a shallow dish shape, and is fitted to the lower end of the stringer 16 by spot welding to perform the stringer 1.
It is integrated with 6.

As shown in FIG. 2, the dust removing mechanism 6 has a plurality of blow tubes 18 arranged in a straight tube shape along the alignment line of the filter 5, and a compressed gas to each blow tube 18. It is composed of a supply air source 19 and a header 20 to be supplied, and an electromagnetic valve 21 provided between the header 20 and the blow tube 18. On the lower surface of the blow tube 18, jet holes 22 for jetting the jet airflow A are provided corresponding to each filter 5. When the solenoid valve 21 is opened and operated, the blow tube 18 is opened.
It is possible to remove dust from the filter row located directly below. The valve opening time at this time is about 0.05 to 0.1 second.

A pulsed jet air flow A from each nozzle 22
Are jetted toward the inside of each filter 5, but this jet stream A tends to pass through the hollow filter inner space and contribute to dust removal only at the rear end side. In order to eliminate such uneven dust removal, a deflector 24 is provided inside the filter 5.
To provide.

In FIG. 1, a deflector 24 comprises a cylindrical frame-shaped supporting member 25, a deflecting member 26 arranged along the longitudinal direction of the supporting member 25, and a ring-shaped fitting fixed to the upper end of the supporting member 25. 27, and a shielding plate 28 fixed to the lower end (inner end) of the support 25. The support member 25 is constituted by a stringer 29 and a shape-retaining ring 30 into a cylindrical frame shape similar to that of the cage 12, and its upper end is expanded upward to form a taper shape. The ring diameter, that is, the imaginary circle diameter of the cylindrical frame is set to about 60% of the imaginary circle diameter of the cage 12 so that a sufficient gap is formed between the cage 12 and the support 25 in the mounted state. . The total length of the support 25 is set to be slightly smaller than the total length of the cage 12 so that the shielding plate 28 is located near the back end wall of the cage 12 in the mounted state.

The deflecting member 26 is formed of a galvanized steel wire and includes the shape retaining ring 30 described above. In the uppermost ring 30, a ring body 32 having a smaller diameter than this is arranged in the ring 30, and the two rings 30, 32 are connected by four wire members 33 to form a deflecting body 26. In the ring 30 of the next stage and thereafter, the cross body 34 that intersects in a cross shape is fixed in the ring 30 to form the deflecting body 26. For each ring 30, the fixed position of the cross body 34 and the ring 30 is 90 degrees. They are staggering.

The attachment 27 is formed by punching a steel plate into a donut shape, and is inserted from the lower end side of the support 25 and fixed to the upper end of the stringer 29. The inner opening diameter of the fitting 27 is equal to or slightly larger than the outlet opening diameter of the filter 5. In order to receive and support the attachment 27, the upper end of the stringer 29 is bent outward in the radial direction to provide the receiving claw 35. The members forming the deflector 24 are integrated by welding.

As shown in FIG. 3, the deflector 24 is inserted from the side of the outlet opening of the filter 5 toward the inner side, and the fixture 27 is hooked on the upper surface of the base 13 of the cage 12, The wearing condition is maintained by its own weight. As described above, according to the support structure in which the entire deflector 24 is suspended by the fixture 27, the mounting posture of the deflector 24 can be maintained without any trouble even when the total length of the filter 5 is large. Furthermore, the entire deflector 24 can be replaced if necessary. After the deflector 24 is attached to the filter 5, the venturi 36 is inserted and loaded into the opening.

Next, the operation of the deflector 24 will be mainly described. Jet airflow A ejected from the nozzle 22 during dust removal
Moves straight through the space in the filter 5 at high speed. But,
Since the deflector 24 is provided in the filter 5, the jet airflow A collides with the deflector 26 in the uppermost stage immediately after being jetted into the filter 5 as shown in FIG. While sequentially colliding with the deflecting body 26, it moves to the inner bottom of the filter 5, and finally collides with the shielding plate 28 to be dispersed. The jet airflow A colliding with each of the deflecting bodies 26 during the transition is forcibly changed in direction by the deflecting bodies 26, and a part of the jet airflow A is directed to the filter wall of the filter 5. The deflected airflow causes the filter element 11 around the deflector 26 to rapidly expand, and the airflow blowing through the filter wall also blows off the dust to remove the dust adhering to the outer surface of the filter. Moreover, this detaching action continuously progresses from the side of the outlet opening toward the inside. Therefore, the dust adhering to the outer surface of the filter element 11 can be removed evenly, the filtration surface wall can be regenerated to an appropriate state, and the dust that has once separated can be prevented from reattaching to the filter element 11.

As described above, the jet air flow A is directed to the respective deflecting elements 2
6, it reaches the inside of the filter in a state where its momentum is gradually weakened, but it still has sufficient velocity energy. Conventionally, the jet airflow A repeatedly colliding with the rear end wall 14 damages the cage 12, breaks through the filter element 11, and causes the entire cage 12 to fall off the partition wall 2. Providing a shielding plate 28 on the deflecting body 26 can eliminate such an accident. This is because the shield plate 28 receives most of the energy of the collision. The back end wall 14 is externally fitted and attached to the stringer 16 in order to cover the filter element 11 and is integrated with the stringer 16 only at the welded portion, so that it does not fall off as described above. It was easy to occur. However, in the case of the shielding plate 28, since it is not necessary to take such consideration, since the plate surface can be received by using the stringer 29 and can be firmly integrated by welding, the shielding plate 28 can be removed. There is nothing to do.

In the existing dust collector, uniform dust removal can be performed only by additionally equipping the deflector 24. As a result, the effective filtration area can be substantially increased and the life of the filter element can be improved.

5 to 9 show a modification of the deflector 24. In FIG. 5, the deflecting body 26 was formed by a rectangular metal plate piece, and a group of the deflecting body 26 was continuously welded and fixed to the stringer 29 in a spiral shape.

In the deflector 24 shown in FIG. 6, a support body 25 is constituted by a support shaft 37 made of a solid shaft and a cylindrical frame 38 fixed to the upper end of the support shaft 25, and one end of the support body 25 is provided. Fixture 27
Is provided, and a wire rod is welded to the support shaft 37 so that the deflection member 26
And The upper end of the support shaft 37 is narrowed upward and sharpened into a taper shape, which is also the deflecting body 26. In this way, the support 2
5 can also be formed in a shaft shape.

The deflecting body 26 in FIG. 6 has a structure shown in FIG.
It can be changed as shown in (b). In FIG. 7 (a),
The bar-shaped deflecting bodies 26 are fixed to the support shaft 37 at appropriate intervals. As the deflecting member 26 approaches the inner bottom from the outlet opening of the filter 5, the bending radius of the deflecting member 26 is increased, and the lower end opening diameter thereof is set larger. In FIG. 7B, the deflecting body 26 is formed by a plurality of metal plates 26a twisted like a propeller, and is fixed to the support shaft 37 at predetermined intervals.

In FIG. 8, the deflector 24 is replaced by a ceramic filter 5
The example applied to a is shown. In this, the support 2
A fitting 27 in the form of a base is provided on the upper end of the fitting 5, and the fitting 2
7 was hooked on the loading cylinder 39 of the filter 5a.

In the embodiment shown in FIG. 9, a ring-shaped fixture 27 is fixed to a bottomed conduit 40 having a tapered taper shape to form a deflector 24. A group of openings 41 is formed on the peripheral wall of the conduit 40. Regarding the formation of the opening 41, the opening area of the opening 41 is reduced as it approaches the small diameter end from the large diameter end. Alternatively, the opening areas of the openings 41 are made the same, and the number of formed portions is gradually reduced from the large diameter end toward the small diameter end. The bottomed conduit 40 may be formed by a multistage tubular body or a straight tube. In addition to the above, a group of the deflection bodies 26 described in FIG. 5 may be provided on the inner surface of the cage 12, and the deflection airflow can be formed by the deflection unit 24 and the cage 12. The deflecting bodies 26 are arranged densely on the upper side and roughly arranged closer to the inner depth. The shielding plate 28 is
It may be formed in a three-dimensional shape such as a circular shape, or may be formed of a perforated plate or a net body other than the steel plate. It may be omitted in some cases. If the shield plate 28 is omitted, the deflector 2
The vertical length of 4 can be reduced from the outlet opening of the filter 5 to the vicinity of the central portion in the vertical direction. Of course, the deflector 24 can be provided only near the exit opening. The deflector 24 of the present invention can be applied to a dust collector using various hollow filters such as an envelope type filter, a filter having an accordion pleat filter wall, and a filter made of a sintered plastic body. The above embodiments may be implemented in combination as appropriate. Although compressed air is often used as the compressed gas for dedusting, various gases such as steam and compressed nitrogen can be used depending on the object to be dedusted.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a filter and a deflector.

FIG. 2 is a vertical cross-sectional view showing the principle structure of a dust collector.

FIG. 3 is a vertical cross-sectional view showing a structure of a mounting portion of a deflector.

FIG. 4 is an explanatory view showing the action of the deflecting body.

FIG. 5 is a front view of a main portion of a deflector showing another embodiment of the deflector.

FIG. 6 is a front view showing another embodiment of the deflector.

FIG. 7 shows still another embodiment of the turning device, FIG.
Is a front view and FIG. 7B is a perspective view.

FIG. 8 is a vertical sectional view showing an embodiment in which a deflector is applied to a ceramic filter.

FIG. 9 is a partially broken sectional view showing another embodiment of the deflector.

[Explanation of symbols]

1 ... Housing, 5 ... Filter, 6 ... Dust removal mechanism, 11 ... Filter element, 12 ...
J, 24 ......... Director, 25 ......... Support, 26 .........
Transforming body, 27 ......... Mounting fixture, 28 ......... Shielding plate, A ...
… Jet stream.

Claims (7)

[Claims] 1. A self-cleaning dust collector having a group of hollow filters 5 provided inside a housing 1 and a dust removing mechanism 6 for ejecting a jet airflow A for dust removal into each filter 5. In the internal space of the filter 5, a deflector 24 that guides the impinging jet airflow A toward the filtration wall is provided from the outlet opening of the filter 5 toward the inside. A self-cleaning dust collector. 2. The deflector 24 includes a support 25 and a support 2.
5. The self-cleaning dust collector according to claim 1, further comprising a group of deflecting members 26 fixed to the supporting member 25 along the longitudinal direction of 5. 3. The jet air flow A is provided at the inner rear end of the deflector 24.
The self-cleaning dust collector according to claim 1 or 2, further comprising a blocking plate 28 for blocking the above. 4. The deflector 24 is composed of a support 25 including a support shaft 37 and a cylindrical frame 38 fixed to the upper end of the support shaft 25. A support 27 is provided at one end of the support 25 to support the support 25. The self-cleaning dust collector according to claim 1 or 2, wherein the shaft 37 is provided with the deflecting body 26. 5. The self-cleaning dust collector according to claim 1, wherein the deflector 24 is formed separately from the filter 5 and is provided so as to be insertable into and removable from the filter 5. 6. A self-cleaning dust collector comprising a group of hollow filters 5 provided inside the housing 1 and a dust removing mechanism 6 for ejecting a jet airflow A for dust removal into each filter 5. In the internal space of the filter 5, the fitting 27 is fixed to the tapered bottomed conduit 40 to form the deflector 24, and the peripheral wall of the conduit 40 is provided with the opening 41. A group is formed, and the opening area of the opening 41 is made smaller as it approaches the small diameter end from the large diameter end, or the opening area of the opening 41 is made the same,
A self-cleaning dust collector characterized by gradually reducing the number of formed parts from the large diameter end toward the small diameter end. 7. A deflector 24, which is inserted from the outlet opening of the hollow filter 5 toward the inner side and guides the impinging jet stream A toward the filtering wall. Is a support body 25, a group of deflecting bodies 26 fixed to the support body 25 along the longitudinal direction of the support body 25, and one end of the support body 25. A dedusting deflector for a dust collector, including a fixture 27 that is received and supported by a wall.