This application is a 371 application of PCT/JP2017/044532 having an national filing date of Dec. 12, 2017, which claims priority to JP2017-010096 filed Jan. 24, 2017, the entire content of each of which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a dust collector and a dust removal method for the same, and more specifically relates to a dust collector including a pulse jet type dust removal mechanism for removing dust adhered to a cylindrical filter, and a dust removal method from a filter in such a dust collector.

BACKGROUND ART

As a dust collector that removes dust from dust-containing gas containing dust by a filter, a dust collector including a pulse jet type dust removal mechanism for ejecting compressed air from a discharge section in a pulsed state, in order to remove dust adhered to a filter is known.

For example, a dust collector including a dust removal mechanism for increasing the internal pressure of a filter to equal in the internal pressure over the entire length of the filter by providing a tapered tube having a frustoconical shape in the cylindrical filter, or providing a concave bottom plate in a lower end of the filter is known (for example, refer to Patent Document 1).

PRIOR ART DOCUMENT

Patent Document

Patent document 1: Japanese Patent Unexamined No. 2011-245439

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

However, in the above dust removal mechanism, an effect of uniformly removing dust over the entire length of a cylindrical filter is still insufficient. Furthermore, a member that obstructs a flow of air is installed in the cylindrical filter, and therefore there is a problem that the pressure loss of the filter is increased.

The present invention has been made in view of such points, and an object of the present invention is to provide a dust collector including a pulse jet type dust removal mechanism capable of uniformly renaming dust over the entire length of a cylindrical filter without increasing the pressure loss in the cylindrical filter; and a dust removal method for such a dust collector.

Means for Solving Problem

According to the present invention, there is provided a dust collector including a pulse jet type dust removal mechanism for removing dust adhered to a cylindrical filter, the pulse jet type dust removal mechanism comprising a first discharge section having a first discharge nozzle for discharging a pulse jet from an opening on a first end side of the cylindrical filter toward inside of the cylindrical filter; and a second section for discharging having a second discharge nozzle for discharging a pulse jet from a second end side of the cylindrical filter toward the opening on the first end side of the cylindrical filter, and the second discharge nozzle for the discharging is provided on a tip side of a pipe line extending from the first end side of the cylindrical filter to the second end side of the cylindrical filter.

According to such a configuration, any member that increases the pressure loss of the filter of the internal space of the cylindrical filter is not disposed, and furthermore, the oppositely facing pulse jets are discharged from both end sides of the cylindrical filter toward the internal space of the cylindrical filter, and therefore dust can be uniformly removed over the entire length of the cylindrical filter without increasing the pressure loss in the cylindrical filter.

Furthermore, the pulse jet discharge nozzles for dust removal can be disposed at oppositely facing positions in the filter without adding any significant change to an existing dust collector.

According to another preferred aspect of the present invention, the pipe line has an inverting path provided in a tip part, and the second discharge nozzle is provided in a tip of the inverting path.

According to such a configuration, the pulse jet discharge nozzles for dust removal can be disposed at oppositely facing positions in the filter with a simple configuration.

According to another preferred aspect of the present invention, the inverting path has a substantial U-shape.

According to another preferred aspect of the present invention, the pipe line is disposed in an internal space of the cylindrical filter that is a space into which cleaned air is introduced.

In a configuration in which the pipe line is disposed on the outside of the cylindrical filter where dust exists, there is a possibility that dust enters the pipe line at this portion, and is ejected from the tip of the pipe line into the filter. Therefore, in the configuration in which the pipe line is disposed on the outside of the cylindrical filter, it is necessary to secure airtightness of the pipe line, and the manufacturing cost of the device is increased. However, according to the above configuration, the pipe line is disposed in the internal space of the cylindrical filter that is the space into which cleaned air is introduced, and therefore high airtightness of the pipe line itself is not required, and the manufacturing cost of the collector and the like are reduced.

According to another preferred aspect of the present invention, the pipe line is disposed outside the cylindrical filter, and the path penetrates the filter on the second end side of the cylindrical filter to extend into an internal space of the cylindrical filter.

According to such a configuration, any member that obstructs the flow of air does not exist inside the cylindrical filter, and therefore the flow of the air becomes smooth in the internal space of the filter.

According to another preferred aspect of the present invention, the second discharge nozzle has at tapered shape.

According to such a configuration, pressure and speed of the discharged pulse jet is increased by the tapered discharge nozzle. As a result, the higher-speed pulse jet reaches to further area, and furthermore the higher-speed pulse jet takes in a larger quantity of surrounding air, so that a dust removal will be effectively improved.

According to another preferred aspect of the present invention, the second discharge nozzle has an expanded shape.

According to such a configuration, the discharged pulse jet is expanded by the expanded shape of the nozzle, and a dust removal effect can be obtained in a wider area of the inside of the filter.

According to another preferred aspect of the present invention, a tip side of the inverting path is branched into a plurality of portions, and a second discharge nozzle is provided in each of the portions.

According to such a configuration, particularly, when the internal cross-section area of the cylindrical filter is wide, a dust removal effect can be obtained in a wider area of the inside of the filter by the discharge of the pulse jets from the plurality of portions.

According to another preferred aspect of the present invention, the second discharge section is configured integrally with the cylindrical filter, and is configured to be integrally detachable from the dust collector.

According to such a configuration, the filter can be detached without additional operation, and it is possible to easily detach the filter similarly to a conventional manner.

According to another preferred aspect of the present invention, the dust collector including a cell plate partitioned into a dust chamber and a cleaned air chamber; and a filter frame for mounting the cylindrical filter on the cell plate, wherein the filter frame has a projection complementary to a hole formed on the first end side of the cylindrical filter, and the cylindrical filter is detachably mounted on the dust collector by fitting of the projection in the hole.

According to such a configuration, positioning of the discharge positions of the pulse jets and the center position of the filter is reliably and easily performed, and an effective dust removal effect by the pulse jets can be obtained.

There is provided a dust removal method for an of the above dust collectors, the dust removal method including a step of discharging the pulse jet from the first discharge section and the second discharge section to remove dust from the cylindrical filter. Wherein the discharge of the pulse jet from the first discharge section and the discharge of the pulse jet from the second discharge section are started with a time difference.

According to such a configuration, pressure rising portion generated by collision of the two pulse jets can be changed, and therefore dust on a specific portion of the filter can be reliably removed.

According to another preferred aspect of the present invention, the removing step is performed while the time difference is changed.

According to such a configuration, the pressure rising portion is sequentially moved in the filter, and dust of the entire filter can be effectively removed.

Effects of the Invention

According to the present invention, there is provided a dust collector including a pulse jet type dust removal mechanism capable of uniformly removing dust over the entire length of the cylindrical filter without increasing the pressure loss in the cylindrical filter, and a dust removal method for such a dust collector.

