JP5216692B2 - 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 unit that collects dust contained in the flowing dust-containing air, and a high-pressure air jet from the purified air chamber side to the dust-containing air introduction chamber side through the filter unit and adhere to the filter unit The present invention relates to a dust collecting apparatus including a high-pressure air ejection unit that cleans the dust and a control unit that controls the operation of the high-pressure air ejection unit.

  The dust collector 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 by the filter unit and supplies it from an incinerator or crushing equipment This is a device for purifying dust-containing air, and dust that has been collected and adhered to the filter section is removed by blowing high-pressure air from the purified air chamber side to the dust-containing air introduction chamber side through the filter section. It can be cleaned (see, for example, Patent Document 1 and Patent Document 2).

For example, in the dust collector described in Patent Document 1, the filter unit is configured by a bag filter, that is, a bag-shaped filter (filter cloth) covered with a basket-shaped support, and when the bag filter is cleaned. The dust adhering to the bag filter can be removed by instantaneously and intermittently sending a large amount of high-pressure air from the purified air chamber side through the bag filter to the dust-containing air introduction chamber side (from the inside to the outside of the bag filter) multiple times. It is said that clogging can be eliminated by cleaning as a wipe-off. The removed dust falls to the bottom of the housing and is collected.
Moreover, in the dust collector of patent document 2, the dust collector which purifies with a ceramic filter before purifying dust-containing air with the said bag filter is disclosed, and when cleaning the said ceramic filter, purified air is disclosed. By supplying a pressurized pulse jet from the chamber side through the ceramic filter to the dust-containing air introduction chamber side (from the inside to the outside of the ceramic filter), dust attached to the ceramic filter can be removed and cleaned. It is supposed to be possible.

JP-A-8-38837 JP-A-9-234325

In the dust collector as described above, the cleaning of the filter unit is usually in a state where the flow of the dust-containing air from the dust-containing air introduction chamber side to the purified air chamber side is stopped, that is, the dust collector is stopped. It is supposed to be done in the state. In this manner, the dust collector is stopped when the filter unit is cleaned from the dust-containing air introduction chamber side to the purified air chamber side (from the outside of the filter unit to the inside). When dust air is flowing, even if high-pressure air is ejected from the purified air chamber side to the dust-containing air introduction chamber side (from the inside to the outside of the filter unit), it is difficult to remove dust attached to the outside of the filter unit. This is because inconveniences such as dust that has been wiped off by the flowing dust-containing air adhere to the outside of the filter portion again.
However, a dust source is connected to the upstream side of the dust collector, and when the dust collector is stopped and the flow of dust-containing air is stopped as described above, the dust source is generated. Since it is necessary to stop the operation of the incinerator and crushing equipment, etc., it is preferable that the filter unit can be cleaned without stopping the dust collector.

  The present invention has been made in view of such circumstances, and its purpose is to continue the operation of the dust collector and collect dust in the dust-containing air while the filter unit collects dust attached to the filter unit. An object of the present invention is to provide a dust collector that can be cleaned well.

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 part that collects dust contained in the dust-containing air that flows from the dust-containing air introduction chamber side to the purified air chamber side, and the dust-containing part from the purified air chamber side through the filter part A dust collector comprising: a high-pressure air jet section that jets high-pressure air in a pulsed manner toward the air introduction chamber to clean dust adhering to the filter section; and a control section that controls the operation of the high-pressure air jet section And the characteristic composition is
The filter portion is composed of a bag filter in which a bag-like bug is covered on a support,
The control unit causes the bag filter to pass the dust-containing air from the dust-containing air introduction chamber side to the purified air chamber side, and collects dust in the bag filter. High pressure air is ejected in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side by operating the ejection part, and then the pressure difference between the inside and outside of the bag filter collects the dust. and the high pressure air injection unit is operated again before recovering the pressure difference in a state that you are, when the jetting high-pressure air pulsed again from the clean air chamber side of the dust-containing air introducing chamber side, wherein The ejection time of the high-pressure air ejected in a pulse form is set to be smaller than the ejection time of the high-pressure air ejected in a pulse form again .

According to this characteristic configuration, the filter portion is formed of a bag filter in which a bag-like bug is covered on a support, and dust- containing air is caused to flow from the dust-containing air introduction chamber side to the purified air chamber side through the bag filter. In the state where dust is collected in the bag filter , the high-pressure air jet section is operated to jet high-pressure air from the purified air chamber side to the dust-containing air introduction chamber side, so the dust collector continues to operate. However, the bag filter can be cleaned, and the operation of the incinerator, crushing equipment, or the like, which is the source of dust-containing air containing dust, can be continued. In particular, after high-pressure air is ejected in a pulsed manner, the pressure difference between the inside and outside of the bag filter due to the high-pressure air ejected in the pulsed state collects dust before the high-pressure air is ejected. Before the pressure difference is recovered, the high-pressure air ejection section is operated again, and high-pressure air is ejected again in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side. Thus, the high pressure air injected into the previously pulsed, dropped to some extent pay dust attached to the dust-containing air introducing chamber side of the bag filter (outer) Clean, further, the bag filter without being completely blown away dust-containing air introducing chamber side dust remaining in the (outside), until the air containing dust adheres to the outside of the back bag filter by flowing into the clean air chamber side of the bag filter (inside), The next high-pressure air can be ejected again in a pulsed manner, and the dust adhering to the bag filter can be reliably removed and cleaned. Basically, the bag filter is caused to pass dust-containing air from the dust-containing air introduction chamber side to the purified air chamber side, and dust is collected in the bag filter (hereinafter sometimes referred to as normal operation). pressure difference between the inside and outside of the bag filter in) is a low pressure differential toward the interior of the pressure than the pressure outside the bag filter (negative pressure), while the dust-containing air introduced from clean air chamber side while jetting high-pressure air in pulses to the chamber side in (hereinafter sometimes referred to cleaning operation), the pressure difference between the inside and outside of the bag filter is the side of the inside pressure than the pressure outside the bag filter High pressure difference (positive pressure).
Thus, while the collection of dust continued dust-containing air by the bag filter operation of the dust collector, it is possible to satisfactorily clean the dust attached to the bag filter.
In addition, after jetting high-pressure air in a pulsed manner, the pressure difference between the inner side and the outer side of the bag filter due to the high-pressure air jetted in the pulsed state collects dust before jetting the high-pressure air. Before recovering the pressure difference, high-pressure air is jetted again from the purified air chamber side to the dust-containing air introduction chamber side, so that the high-pressure air is jetted inside the bag filter in a pulsed manner. It is configured to expand outward and become tensioned, and the next high-pressure air is ejected in pulses within the time until the tension state of the bug due to this high-pressure air being ejected in pulses is resolved. can do. As a result, the high-pressure air blown out in the form of a pulse can remove dust attached to the outside of the bug to some extent, and in addition to the dust attached to the bug in a state where the bug remains in tension. The high-pressure air can be ejected in a pulse shape, and the jet power of the high-pressure air ejected in the next pulse shape can be directly applied to the dust, remaining on the outside of the bug and on the fibrous part constituting the bug. The dust that has been removed to some extent can be removed more reliably and cleaned.
Furthermore, since the ejection time of the high-pressure air ejected in pulses is set to be shorter than the ejection time of the high-pressure air ejected again in pulses, the high-pressure air ejected in the previous pulse is mainly a bag filter. The dust can be blown out for the purpose of impacting the dust, and the amount of dust can be blown off to some extent while reducing air consumption. (Extruding) can be performed to better remove dust adhering to the bag filter, and can be cleaned better.

In a further characteristic configuration of the dust collector according to the present invention, the control unit operates the high-pressure air ejection unit in a state where dust is collected in the bag filter , and the inclusion is performed from the purified air chamber side. High-pressure air is ejected in a pulsed manner to the dust air introduction chamber side, and then the high-pressure air ejection section is operated again before the pressure difference between the inside and outside of the bag filter falls below zero, The high-pressure air is again ejected in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side.

According to this characteristic configuration, after the high pressure air is jetted in a pulse shape, before the pressure difference between the inner side and the outer side of the bag filter drops below zero, the high pressure air jetting section is operated again to include the air from the purified air chamber side. Since high-pressure air is re-injected into the dust air introduction chamber in a pulsed manner, high-pressure air is re-injected in a pulsed state with the pressure difference between the inside and outside of the bag filter maintained at a positive pressure or zero in the cleaning operation. Can do. As a result, the dust remaining on the dust-filled air introduction chamber side (outside) of the bag filter without being completely wiped out by the high-pressure air jetted in the form of the pulse is converted into the bag filter purified air. By flowing to the chamber side (inside), it can be reliably prevented from adhering to the outside of the bag filter again, and the dust can be better removed and cleaned.

Further characteristic feature of the dust collecting apparatus according to the present invention, the distance to the ejection of high-pressure air ejected before Symbol pulsed is completed, ejection of the high pressure air starts to be ejected again pulsed, 0 The point is that it is set between 01 seconds and 2 seconds.

According to this characteristic configuration, the filter portion is formed of a bag filter in which a bag-like bug is covered on the support, and at the end of the ejection of the high-pressure air ejected in a pulsed manner and the next high-pressure air ejected in a pulsed manner again Since the interval from the start of jetting is set to 0.01 to 2 seconds, the high-pressure air is jetted into the inside of the bag filter in a pulse shape, so that the bug expands outward and becomes a tension state. Thus, the next high-pressure air can be ejected in pulses within the time until the tension state of the bug due to this high-pressure air being ejected in pulses is resolved. As a result, the high-pressure air blown out in the form of a pulse can remove dust attached to the outside of the bug to some extent, and in addition to the dust attached to the bug in a state where the bug remains in tension. The high-pressure air can be ejected in a pulse shape, and the jet power of the high-pressure air ejected in the next pulse shape can be directly applied to the dust, remaining on the outside of the bug and on the fibrous part constituting the bug. The dust that has been removed to some extent can be removed more reliably and cleaned.
The lower limit of the interval (pulse interval) between the end of ejection of high-pressure air that is ejected in pulses and the start of ejection of the next high-pressure air that is ejected in pulses again is the high-pressure air ejection section that pulses high-pressure air Is set to a time during which the next high-pressure air can be ejected in pulses, and the upper limit value can maintain the tension state of the bag filter after the high-pressure air is ejected in pulses. Thus, the pressure difference between the inner side and the outer side of the bag filter is set to a time until the pressure difference is recovered before the high-pressure air is ejected in a pulse shape. Specifically, if the interval is smaller than 0.01 seconds, it is difficult to supply a predetermined pressure and a predetermined amount of high-pressure air to the bag filter, and if it is longer than 2 seconds, it is not preferable. The pressure difference between the inner side and the outer side is restored to the pressure difference in the state before the high-pressure air is jetted in pulses, and the tension state of the bag filter cannot be maintained, which is not preferable.

Schematic side sectional view of the dust collector according to the present invention Schematic top view of the dust collector according to the present invention Schematic side sectional view of bag filter The graph which shows the change state of elapsed time and the pressure difference between inside and outside the filter

Hereinafter, in the dust collector A which concerns on this invention, embodiment at the time of using the bag filter 5 as a filter part is described.
As shown in FIGS. 1 and 2, the dust collector A is provided on the partition wall 4, with the housing 1 partitioned into a dust-containing air introduction chamber 2 and a purified air chamber 3 by the partition wall 4, A bag filter 5 that collects dust D contained in the dust-containing air G that flows from the dust-containing air introduction chamber 2 side to the purified air chamber 3 side inside the housing 1, and a bag filter from the purified air chamber 3 side The high-pressure air ejection part 6 that cleans the dust D adhering to the bag filter 5 by ejecting the high-pressure air H in a pulse shape to the dust-containing air introduction chamber 2 side via 5, the operation of the high-pressure air ejection part 6, etc. A control unit 7 for controlling the operation of the dust collector A is provided. The dust collector A includes a pressure difference detection unit 8 that detects a pressure difference between the inside and the outside of the bag filter 5.

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 the bag 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 rectangular shape in a top view when the bag filter 5 is disposed in the dust-containing air introduction chamber 2 and the portion where the purified air chamber 3 is formed, and the bag filter in the dust-containing air introduction chamber 2 is formed. The lower outer shape of the place where 5 is arranged is formed in a funnel shape. A dust-containing air introduction path 9 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 10 for discharging the purified air C purified by the bag filter 5 from the purified air chamber 3 is formed at the 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 passage 10 so that the purified air C in the purified air chamber 3 can be sucked into the external space. In addition, a discharge port 11 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 inside of the dust-containing air introduction chamber 2 generated by cleaning the bag filter 5 described later or the like. The dust D and the like can be discharged.
Therefore, the dust-containing air G generated in an incinerator or the like (not shown) is introduced into the dust-containing air introduction chamber 2 through the dust-containing air introduction passage 9 by the suction force of the suction device (not shown). Dust D is collected by the bag 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 A via the purified air discharge passage 10. .

As shown in FIG. 3, the bag filter 5 has a bottomed cage shape (for example, a bottomed cylindrical cage shape in which a plurality of linear rod-shaped bodies are attached to a plurality of ring-shaped frame bodies formed in an annular shape). A bag-like bug 5b configured to allow the dust-containing air G to flow therethrough is covered on the outside of the formed support 5a. The bug 5b is composed of a filter cloth that can satisfactorily collect the dust D in the dust-containing air G. For example, a base cloth formed by a non-woven cloth attached on the outside of the cloth or a non-woven cloth or a woven cloth. Composed of cloth or the like. The material of the filter cloth is made of synthetic fiber or glass fiber. As shown in FIGS. 1 and 3, the lower portion of the bug 5b is formed in a bag shape, and the upper portion is provided with an opening, and a venturi tube 12 of a high-pressure air ejection portion 6 to be described later is attached to the opening. The portion is sandwiched and fixed between the venturi tube 12 and the support 5a.
The bag filter 5 is attached to the partition wall 4 in a suspended state via the venturi tube 12 as shown in FIGS. 1 and 2. In this embodiment, 16 bag filters 5 are provided in a state in which 4 are arranged vertically and 4 are arranged horizontally. However, the arrangement location, the number of arrangement, the shape of the bug 5b, and the venturi tube 12 are provided. The presence or absence, etc. can be changed as appropriate in relation to the amount of dust D processed.

The high-pressure air ejection unit 6 is configured to eject the high-pressure air H in a pulse shape inside each bag filter 5. Specifically, the high-pressure air ejection unit 6 adjusts the pressure of high-pressure air H from a pressure source (not shown) such as a compressor via a pressure regulating valve 14 provided in the high-pressure air supply path 13. The header pipe 16 can be stored. The high-pressure air ejection unit 6 converts the high-pressure air H stored in the header pipe 16 into a plurality of air on-off valves 15 (in FIG. 2, four of 15a, 15b, 15c, 15d). Are distributed to a plurality of jet pipes 18 (in FIG. 2, four pipes 18a, 18b, 18c and 18d), and the distributed high-pressure air H is provided with a plurality of jet nozzles 19 provided in each jet pipe 18. To the inside of each bag filter 5 through each venturi tube 12. Opening and closing of each air on / off valve 15 is configured to be controllable by operating portions 17 (four in FIG. 2, 17a, 17b, 17c and 17d) provided corresponding to each air on / off valve 15. Each ejection nozzle 19 is disposed above each bag filter 5 so as to correspond to each bag filter 5 on a one-to-one basis. Four bag filters 5 are arranged in parallel in the first jet pipe 18a corresponding to the first air on-off valve 15a. Similarly, the second jet pipe 18b and third air corresponding to the second air on-off valve 15b are arranged. Four bag filters 5 are arranged in parallel in the third ejection pipe 18c corresponding to the on-off valve 15c and the fourth ejection pipe 18d corresponding to the fourth air on-off valve 15d, respectively. Therefore, the high-pressure air H stored in the header pipe 16 is in an open / closed state in which the operation units 17 are controlled by the control unit 7 and the open / close states of the air on / off valves 15 corresponding to the respective operation units 17 are set. By being controlled in such a manner, it can be ejected in the form of pulses inside each bag filter 5 via each ejection nozzle 19. The pressure and the air amount of the high-pressure air H stored in the header pipe 16 can be appropriately set according to the pressure and the air amount of the high-pressure air H that needs to be ejected. For example, the pressure is 2 kg / cm. ² , the capacity can be set to 450 cm ³ .

  The control unit 7 includes a central processing unit (CPU), a memory, a storage unit, and the like (not shown), and includes known information processing means that can execute a predetermined program and process information by the CPU. The operation of the dust collector A can be controlled.

As shown in FIG. 1, the pressure difference detector 8 is provided in a dust-containing air introduction path 9 and detects the pressure outside the bag filter 5 (on the dust-containing air introduction chamber 2 side). A first pressure detection unit 8a, and a second pressure detection unit 8b that is provided in the purified air discharge passage 10 and detects the pressure inside the bag filter 5 (purified air chamber 3 side). These first pressure detection units Based on the detected pressure from 8a and the 2nd pressure detection part 8b, it is comprised so that the internal / external differential pressure | voltage of the bag filter 5 can be detected. The detected internal / external differential pressure of the bag filter 5 is configured to be output to the control unit 7.
The pressure difference detection unit 8 includes a third pressure detection unit 8c that detects the pressure inside the bag filter 5 (inside the bag 5b of the bag filter 5), and includes a first pressure detection unit 8a and a third pressure detection unit. The difference in detected pressure from 8c can be measured as the internal / external pressure difference of the bag filter 5. Further, a predetermined pressure difference serving as a reference for determining that the dust D has adhered to the outside of the bag filter 5 and the dust D cannot be efficiently collected is set in advance (in FIG. 4, the predetermined pressure difference is set). Shown as difference). That is, the pressure difference between the inside and outside of the bag filter 5 is a pressure loss of the dust-containing air G flowing from the outside to the inside of the bag filter 5, whereas the predetermined pressure difference requires the bag filter 5 to be cleaned. It is set as the value of the pressure loss in the case of a new state. The predetermined pressure difference is output to the control unit 7 and can be stored in the storage unit of the control unit 7 in advance.
The purified air discharge path 10 is provided with a known flow rate detection unit 20 that detects 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 output to the control unit 7. Is configured to do.

Next, the normal operation and the cleaning operation will be described with respect to the operation state of the dust collector A controlled by the control of the control unit 7.
In the normal operation of the dust collector A, the control unit 7 starts suction by a suction device (not shown) connected to the downstream side of the purified air discharge path 10 and connects to the upstream side of the dust-containing air introduction path 9. 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 caused to flow from the dust-containing air introduction chamber 2 side to the purified air chamber 3 side through the bag filter 5 (from the outside to the inside of the bag filter 5). D is collected by the bug 5b of the bag filter 5 to purify the dust-containing air G and process it as purified air C. Basically, in normal operation (in a state where dust is collected in the filter portion), the pressure difference between the inner side and the outer side of the bag filter 5 is larger than the pressure outside the bag filter 5. Is a low pressure difference (negative pressure). Here, as shown in FIG. 3A, the bag filter 5 before the start of the normal operation is in a state where the bug 5b is simply covered on the outside of the support 5a, but when the normal operation is started. As shown in FIG. 3B, the bug 5b is attracted to the inside of the support 5a, and the bug 5b comes into close contact with the outside of the support 5a. In this normal operation, the collected dust D adheres to the outside of the bug 5b of the bag filter 5 as shown in FIG. In addition, the control part 7 monitors the information of the internal / external differential pressure inside and outside the bag filter 5 from the pressure difference detection part 8 (the 1st pressure detection part 8a and the 2nd pressure detection part 8b) in normal driving | operation. . Further, the control unit 7 detects the flow rate of the purified air C discharged from the purified air discharge passage 10 in the normal operation by the flow rate detection unit 20, and the suction device so that the detected flow rate becomes a predetermined flow rate. Etc. (not shown) are controlled.
Thereby, the dust D in the dust-containing air G can be collected by the bag filter 5 and the dust-containing air G can be purified well to obtain purified air C.

On the other hand, when this normal operation is continued, as shown in FIG. 3B, the dust D adhering to the outside of the bag filter 5 increases, and the dust D adheres in layers to the outside of the bug 5b. Further, the dust D adheres not only to the outer surface of the bug 5b but also to the inside of the fibrous portion of the filter cloth forming the bug 5b. In such a state, pressure loss occurs in the bag filter 5 and it is difficult to efficiently collect the dust D. Therefore, the control unit 7 detects that the dust D layer has been formed by detecting whether the pressure difference detecting unit 8 (the first pressure detecting unit 8a and the second pressure detecting unit 8b) detects the inside or outside of the bag filter 5. It is recognized that the differential pressure has reached the predetermined pressure difference (preset internal / external differential pressure: see FIG. 4), and it is determined that the bag filter 5 needs to be cleaned. The predetermined pressure difference is set in advance as a pressure difference when, for example, a layer of dust D is formed on the bag filter 5 and dust D cannot be efficiently collected, Those stored in the storage unit 7 can be used.
In such a state, in the present application, the cleaning operation of the bag filter 5 is performed in a state where the normal operation is performed (a state where dust D is collected).

As described above, as shown in FIG. 4, the control unit 7 maintains the suction of the suction device (not shown) and performs the normal operation, and the internal / external differential pressure of the bag filter 5 becomes a predetermined pressure difference. When this happens, the bag filter 5 is cleaned by operating the high-pressure air ejection section 6. As the cleaning operation, first, the control unit 7 adjusts the opening degree of the pressure regulating valve 14 to store the high-pressure air H in the header pipe 16 from the compressor (not shown), and the high-pressure air in the header pipe 16. Control is performed so that the pressure of H is about 2 kg / cm ² .

Then, the control unit 7 controls the opening and closing of each air on-off valve 15 and ejects the high-pressure air H in a plurality of pulses so as to flow from the inside of each bag filter 5 to the outside through the bag 5b. Let
Specifically, as shown in FIG. 4, the control unit 7 controls the open / close state of each air on-off valve 15, and causes the high-pressure air H to enter the bag filter 5 with two pulses at an extremely short pulse interval. Erupt. The high-pressure air H (hereinafter, sometimes referred to as first high-pressure air H1 and second high-pressure air H2) that is jetted in two pulses is divided by the control unit 7 after the first high-pressure air H1 is jetted. The internal / external differential pressure of the bag filter 5 due to the ejection of the first high-pressure air H1 is the internal / external differential pressure in the normal operation (that is, by the suction device before starting the cleaning operation), as shown by the thick solid line in FIG. The bag filter 5 is in a form in which the second high-pressure air H2 is jetted out before recovering to the differential pressure inside and outside the dust D collected by the bag filter 5 in a state where the suction is being performed. It is comprised so that it may inject inside. At this time, basically, the internal / external differential pressure of the bag filter 5 is negative pressure in the normal operation and is reversed to the positive pressure by the cleaning operation (see FIG. 4).
As a result, when the first high-pressure air H1 is ejected, as shown in FIG. 3C, the first high-pressure air H1 flows from the inside of the bag filter 5 to the outside through the bag 5b. The bug 5b shown in (b) inverts from the state contracted inward, and the bug 5b expands to the maximum toward the outside and becomes a tension state. In this state, the opening of the fibrous portion constituting the bug 5b is maximized, and dust D adhering in a layered manner to the outer surface of the bug 5b can be removed to some extent to be cleaned, and the fiber of the filter cloth forming the bug 5b The dust D adhering to the inside of the shaped part can be moved outward to some extent (see FIG. 3C).
After the first high-pressure air H1 is ejected and before the second high-pressure air H2 is ejected, as shown in FIG. 3D, the bag 5b of the bag filter 5 is in a tension state in which it has expanded to the maximum. In this state, the opening of the fibrous portion constituting the bug 5b is relatively large, and the bug 5b maintains a tension state to some extent. That is, the internal / external differential pressure of the bag filter 5 has not recovered to the internal / external differential pressure in the normal operation, and the bag filter 5 is continuously cleaned.

  Next, when the second high-pressure air H2 is ejected in a state where the bug 5b is kept in a certain tension state, as shown in FIG. 3 (e), from the inside of the bag filter 5 to the outside through the bug 5b. The second high-pressure air H2 flows toward the rear, and the bag 5b expands to the maximum toward the outside again to be in a tension state. In this way, the second high-pressure air H2 is ejected in a pulsed manner in a state where the opening of the fibrous portion constituting the bug 5b is relatively large and the bag 5b maintains a certain tension state. The jet power generated by the second high-pressure air H2 can be directly applied to the dust D, and remains on the outside of the bug 5b and on the fibrous portion of the filter cloth constituting the bug 5b and is being wiped off to some extent. The dust D can be moved to the outside to be removed and can be cleaned well (see FIG. 3 (e)).

  Here, as shown in FIG. 4, the first high-pressure air H <b> 1 starts to be ejected when the internal / external differential pressure of the bag filter 5 becomes a predetermined pressure difference, and is ejected for b seconds. The second high-pressure air H2 starts to be ejected after the first high-pressure air H1 has been ejected, and is ejected for c seconds. Here, b seconds (for example, 0.05 seconds), which is the ejection time of the first high-pressure air H1, is set to be shorter than c seconds (for example, 0.1 seconds), which is the ejection time of the second high-pressure air H2. ing. As a result, the first high-pressure air H1 is ejected mainly for the purpose of giving an impact to the dust D adhering to the bag filter 5, and while reducing dust to some extent, the air consumption is suppressed, and the second high-pressure air H2 Can be configured to perform full-scale payment (extrusion). The time (pulse interval) from the end of the ejection of the first high-pressure air H1 to the start of the ejection of the second high-pressure air pulse is a second (for example, 0.2 seconds). The time (cleaning) until the pressure difference between the inner side and the outer side of the bag filter 5 recovers to the pressure difference in the normal operation state after the ejection of the second high pressure air H2 is finished after the ejection of the first high pressure air H1 is started. Time) is set to d seconds (for example, 1 second). The lower limit of a second, which is the pulse interval, is set to a time during which the second high-pressure air H2 can be ejected after the high-pressure air ejection section 6 ejects the first high-pressure air H1, and the upper limit is After the high pressure air H1 is ejected, the tension state of the bag filter 5 can be maintained, and the normal state before the pressure difference between the inside and the outside of the bag filter 5 ejects the first high pressure air H1 in a pulse shape. The time until the pressure difference (negative pressure) is recovered is set. Specifically, if the pulse interval is smaller than 0.01 seconds, the high-pressure air H cannot be sufficiently stored in the header pipe 16, and a predetermined pressure and a predetermined amount of high-pressure air H are supplied to the bag filter 5. If the pressure is longer than 2 seconds, the pressure difference between the inner side and the outer side of the bag filter 5 recovers to the pressure difference in the normal state before the first high-pressure air H1 is ejected in a pulsed manner. Therefore, the tension state of the bag filter 5 cannot be maintained, which is not preferable. For the above reason, the pulse interval is set to 0.01 second or more and 2 seconds or less.

  In this manner, the high-pressure air H is jetted twice inside the bag filter 5 in the above-described ejection form to collect dust D and operate the dust collector A more efficiently. The dust D adhering to the bag filter 5 can be cleaned well.

[Another embodiment]
(1) In the foregoing embodiment, in the high-pressure air ejection section 6, and stores the high-pressure air H to the header pipe 16, it has been adopted a structure for ejecting high pressure air H which is the stored inside the bag filter 5, bag filters If it is the structure which can inject the high pressure air H inside 5 reliably, it will not be specifically limited to this structure. For example, the pressure adjustment valve 14 and the air on-off valve 15 are omitted, and a compressor or the like as a pressure source is connected to the high-pressure air supply path 13, and when the high-pressure air H is necessary, the header pipe 16 and each ejection pipe 18. It can also be set as the structure which jets the high pressure air H to the bag filter 5 via this.

( 2 ) In the above-described embodiment, the high-pressure air jetting unit 6 employs a configuration in which the high-pressure air H is jetted twice inside the bag filter 5. If it is the structure which can eject the air H, it will not be specifically limited to this structure, It can also be set as the structure which ejects the high pressure air H in multiple times. For example, the high-pressure air H can be ejected three times or four times or more.

( 3 ) In the above-described embodiment, in the cleaning operation, the control unit 7 causes the bag filter 5 to collect the dust D and ejects the high-pressure air H, which is subsequently detected by the pressure difference detection unit 8. It has been described that the high-pressure air ejection section 8 is operated again before the pressure difference is restored to the predetermined pressure difference in the state where the dust D is collected, and the high-pressure air H is ejected again in a pulsed manner. However, the present invention is not limited to this configuration, and as shown in FIG. 4, the pressure difference between the inner side and the outer side of the bag filter 5 detected by the pressure difference detecting unit 8 after the high-pressure air H is ejected in the cleaning operation. Before the pressure drops below zero, the high-pressure air ejection section 8 can be operated again to eject the high-pressure air H again. That is, as indicated by a thin solid line in FIG. 4, the high-pressure air pulse H can be ejected again with the pressure difference between the inside and outside of the bag filter 5 maintained at a positive pressure or zero in the cleaning operation. As a result, the dust D remaining on the dust-containing air introduction chamber side (outside) of the bag filter 5 without being completely wiped off by the high-pressure air H ejected in the form of the pulse, and the dust-containing air G being a bug. clean air chamber 3 side of the filter 5 can be reliably prevented from adhering again to the outside of the bag filter 5 by flowing into (inside), be cleaned dislodge the dust D better it can.

  As described above, there is provided a dust collector capable of satisfactorily cleaning dust adhering to the filter section while continuing to operate the dust collector and collecting dust in the dust-containing air by the filter section. We were able to.

DESCRIPTION OF SYMBOLS 1 Case 2 Dust-containing air introduction chamber 3 Purified air chamber 4 Partition wall 5 Bag filter (filter part)
5a Support 5b Bug 6 High-pressure air ejection part 7 Control part A Dust collector D Dust G Dust-containing air C Purified air H High-pressure air

Claims (3)

A housing whose interior is partitioned into a dust-containing air introduction chamber and a purified air chamber by a partition wall;
A filter unit 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;
A high-pressure air jetting unit that jets high-pressure air from the purified air chamber side through the filter unit to the dust-containing air introduction chamber side in a pulsed manner to clean dust adhering to the filter unit;
A dust collector comprising a control unit for controlling the operation of the high-pressure air ejection unit,
The filter portion is composed of a bag filter in which a bag-like bug is covered on a support,
The control unit causes the bag filter to pass the dust-containing air from the dust-containing air introduction chamber side to the purified air chamber side, and collects dust in the bag filter. High pressure air is ejected in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side by operating the ejection part, and then the pressure difference between the inside and outside of the bag filter collects the dust. and the high pressure air injection unit is operated again before recovering the pressure difference in a state that you are, when the jetting high-pressure air pulsed again from the clean air chamber side of the dust-containing air introducing chamber side, wherein A dust collector in which an ejection time of high-pressure air ejected in a pulsed manner is set to be smaller than an ejection time of high-pressure air ejected in a pulsed manner again . With the control unit collecting dust in the bag filter , the high-pressure air ejection unit is operated to eject high-pressure air in a pulse form from the purified air chamber side to the dust-containing air introduction chamber side. Subsequently, before the pressure difference between the inner side and the outer side of the bag filter drops below zero, the high-pressure air ejection unit is operated again, and the dust air introduction chamber side is moved from the purified air chamber side to the dust-containing air introduction chamber side. The dust collector according to claim 1, wherein the high-pressure air is ejected again in a pulse shape. Before SL jetted high pressure air is completed is ejected in pulses, the claims interval until initiating the burst of high pressure air injected again in pulses is set to less than 2 seconds 0.01 seconds The dust collector according to 1 or 2 .

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