JP6290477B2 - Bag filter air amplifying device and bag filter air amplifying system using the bag filter air amplifying device - Google Patents

Description

  The present invention relates to an air amplifier for a bag filter. More specifically, the present invention relates to a bag filter air amplifying device used for bag filter backwashing and a bag filter air amplifying system using the bag filter air amplifying device.

Conventionally, bag filters (filter cloth type dust collectors) have been used for dust removal in incinerators and general factories, and for collecting powder in powder factories. A bag filter is one of filtration dust collectors, and is a device that uses a woven fabric or a non-woven fabric as a filter medium and cylindrically removes the dust or collects powder.

  For example, Patent Document 1 includes a cleaning circuit that selectively connects a dust-containing air chamber and a purified air chamber. The circuit includes a toxic gas removing member, a heater, and a hot air circulation fan, and purified air. By heating the indoor air through the cleaning circuit and introducing it into the dusty air chamber, circulating and heating the dusty air chamber, and detoxifying the dust in the dusty air chamber by the toxic gas removal member, There is disclosed a filter cloth type dust collector that allows an operator to enter and allows the filter cloth to be taken out easily.

  In such a bag filter, normally, dust or powder that has been sucked adheres to the filter (reference numeral 10 in FIG. 1 of Patent Document 1), and only air that does not contain dust or powder is discharged (patent) In FIG. 1 of the document 1, it is discharged to the reference numeral 5 side, whereby dust is removed and powder is collected. However, if the operation is continued, dust and powder gradually adhere to and accumulate on the filter, so that the filtering effect of the filter decreases. Therefore, so-called backwashing is performed in which compressed air is sprayed from a direction opposite to the filtration direction of the filter at regular intervals, and dust and powder adhering to the filter are removed.

  For example, the filter cloth type dust collector of Patent Document 1 includes a reverse injection pipe that feeds compressed air (reference numeral 12 in FIG. 1 of Patent Document 1) and a nozzle that injects compressed air (reference numeral 13 in FIG. 1 of Patent Document 1). It is designed so that backwashing can be performed.

  Thus, in the conventional backwashing method that has been generally performed, since the injected compressed air attracts outside air, the filter can be washed with a theoretically small amount of compressed air using the venturi effect. However, in reality, it is difficult to align the nozzle and the filter, and if they are slightly shifted, the amount of attracting air is greatly reduced, and there is a problem that the designed performance cannot be exhibited.

  In addition, since the compressed air injected from the nozzle uses a venturi, it flows while spreading toward the side of the filter, so there is also the problem of damaging the side of the filter by repeating backwashing many times. there were. Further, when a long filter is used, there is a problem that the compressed air does not reach the bottom surface of the filter, and the backwashing effect is lowered at the lower part of the filter. In addition, since the venturi is attached, the intake air flow path is narrowed by the throttle portion, and there is a problem that air resistance increases and pressure loss occurs when backwashing is not performed.

  In order to solve such problems, in recent years, bag filters have been backwashed using an air amplifying device having a Coanda effect. Since air for backwashing is jetted from the air amplifying device having the Coanda effect almost parallel to the side of the filter, dust and powder adhering to the filter are removed without damaging the side of the filter. be able to.

  For example, Patent Document 2 discloses a Coanda injector in which an inlet for pressurized air and an inlet for external air are arranged on the same plane in order to reduce pressure loss due to a change in the path of pressurized air. ing.

  Further, in Patent Document 3, a pipe for supplying compressed air is divided into two branch pipes, and an air amplifier is connected to the upper part of the branch pipe, and the peripheral equipment is obstructed by the air pressure amplified from the air amplifier. There is also disclosed a compressed air injection device using an air amplifier that can uniformly supply a larger amount of ambient air to a bag filter at a higher speed so as to exhibit a high dust removal effect.

JP 2003-126737 A US Pat. No. 6,604,694 JP 2008-115847 A

  As described above, if an air amplifying device having a Coanda effect is used, a higher back cleaning effect can be expected as compared with the conventional back cleaning using a back injection pipe and a nozzle. However, there are still air amplifying devices that still have insufficient air amplification efficiency, and further development has been desired. In particular, in many cases, 8 to 9 bag filters are usually connected to one lane, and 8 to 9 air amplifiers are also connected to one pipe for sending compressed air. Even if the air amplification efficiency is high, there is a problem that the air amplification efficiency decreases when a plurality of air amplification efficiency is provided.

  Therefore, the main object of the present invention is to provide an air amplifying device having excellent air amplifying efficiency and suitable for bag filter backwashing.

  In order to solve the above technical problem, the present inventor has conducted intensive research on the specific structure of the air amplifying device for improving the air amplifying efficiency, and as a result, has determined that the injection direction of the compressed air is important. The present invention has been completed.

That is, in the present invention, first, an air amplifier used for backwashing a bag filter,
An R-shaped inclined surface that spreads outward, an external air induction port that is connected to the R-shaped inclined surface to attract external air, an amplified air discharge port that discharges amplified air, and the external air attraction An air amplifying part provided with a cylindrical side wall provided from the mouth to the amplified air discharge port;
Compressed air introduction port for introducing compressed air, compressed air injection hole for injecting compressed air to the air amplifying unit, and a curve for guiding the compressed air introduced from the compressed air introduction port to the compressed air injection hole A compressed air introduction part provided with a compressed air guide wall,
Comprising at least
The compressed air injection hole provides a bag filter air amplifying device provided in the external air inlet along the R-shaped inclined surface.
In the conventional bag filter air amplifying device, when the compressed air is injected to the air amplifying unit in order to generate the Coanda effect, it is common knowledge that the injection angle is designed to be perpendicular to the attracting direction of the external air. (For example, see Patent Document 3 FIG. 3 code (3), specification paragraph number 0022). However, the idea is changed from the common sense in the prior art, and in the air amplifying device for bag filter according to the present invention, the injection angle of the compressed air to the air amplifying unit is smaller than 90 ° along the R-shaped inclined surface. It is injected at an angle.
In the air amplifying device for a bag filter according to the present invention, in order to provide the compressed air injection hole in the external air inlet along the R-shaped inclined surface, the R-shaped inclined surface is formed by the compressed air guiding wall. Design in a covered state.
Moreover, it is preferable to design so that the center of the compressed air introduction port is located outside the apex of the curve of the compressed air guide wall.
Furthermore, it is preferable that the cross-sectional area of the amplified air discharge port is designed wider than the cross-sectional area of the external air induction port. In this case, in a portion where the Coanda effect by the compressed air injected from the compressed air injection hole is at least sustained, the side wall is expanded outward, thereby reducing the cross-sectional area of the amplified air discharge port of the external air induction port. It is preferable to design wider than the cross-sectional area.
In the bag filter air amplifying device according to the present invention, the compressed air injection hole may be formed by a gap between the compressed air guide wall and the R-shaped inclined surface. At this time, it is preferable that a convex portion is formed on the inner wall surface of the compressed air guide wall toward the R-shaped inclined surface. It is more preferable that the convex portion is provided along the flow direction of the compressed air.

The bag filter air amplifying device according to the present invention described above is suitable as an air amplifying system used for backwashing a bag filter by adding a compressed air introduction pipe for introducing compressed air to the compressed air introducing portion of the air amplifying device. Can be used.
The bag filter air amplification system according to the present invention is not particularly limited as long as it has the bag filter air amplification device according to the present invention. It is preferable that the connection surface and the connection surface between the compressed air introduction part of the compressed air introduction pipe are formed in parallel to each other.
Moreover, it is preferable that the connection part of the said compressed air introduction part and the said compressed air introduction pipe | tube is sealed with packing.
Furthermore, it is preferable that the connection portion includes a compressed air guide plate that guides introduction of compressed air from the compressed air introduction pipe to the compressed air introduction portion.
In addition, it is preferable that a fixing means for fixing the air amplifying device is provided.

  According to the present invention, it is possible to dramatically improve the air amplification efficiency as compared with the conventional air amplification device having the Coanda effect.

1 is a schematic perspective view schematically showing a first embodiment of a bag filter air amplifying device 1 according to the present invention. It is the cross-sectional schematic diagram which looked at 1st Embodiment of the air amplifier for bag filters 1 concerning this invention from the side surface. It is the cross-sectional schematic diagram which looked at 2nd Embodiment of the air amplifier for bag filters 1 concerning this invention from the side surface. It is the expanded cross-sectional schematic diagram which expanded the broken-line circle | round | yen part of 2nd Embodiment of the air amplification apparatus 1 for bag filters which concerns on this invention shown in FIG. It is the plane schematic diagram which looked at 3rd Embodiment of the air amplification apparatus 1 for bag filters which concerns on this invention from the bottom part side. It is the cross-sectional schematic diagram which looked at 1st Embodiment of the air amplification system 10 for bag filters which concerns on this invention from the side surface. It is the cross-sectional schematic diagram which looked at 2nd Embodiment of the air amplification system 10 for bag filters which concerns on this invention from the side surface. It is a model perspective view which shows typically 3rd Embodiment of the air amplification system 10 for bag filters which concerns on this invention. It is a model perspective view which shows typically 4th Embodiment of the air amplification system 10 for bag filters which concerns on this invention. It is the cross-sectional schematic diagram which looked at 5th Embodiment of the air amplification system 10 for bag filters which concerns on this invention from the side surface.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. In addition, embodiment described below shows an example of typical embodiment of this invention, and, thereby, the range of this invention is not interpreted narrowly.

<1. Bag Filter Air Amplifier 1>
FIG. 1 is a schematic perspective view schematically showing a first embodiment of an air amplifying device 1 for a bag filter according to the present invention. FIG. 2 is a schematic cross-sectional view of the first embodiment of the bag filter air amplifying device 1 according to the present invention as viewed from the side.

  The bag filter air amplifying apparatus 1 according to the present invention is roughly divided into at least an air amplifying unit 11 and a compressed air introducing unit 12. The air amplifying unit 11 includes an R-shaped inclined surface 111, an external air attracting port 112, an amplified air discharge port 113, and a side wall 114. The compressed air introducing unit 12 includes a compressed air introducing port 121, A compressed air injection hole 122 and a compressed air guide wall 123 are provided. Hereinafter, each part will be described in detail.

(1) Air amplifier 11
The air amplifying unit 11 is a part that amplifies air using the Coanda effect by the compressed air injected from the compressed air introducing unit 12 described later.

(A) R-shaped inclined surface 111
The R-shaped inclined surface 111 takes a form of expanding outward in order to guide the external air to the external air inlet 112 described later. Specific aspects such as the size and inclination angle of the R-shaped inclined surface 111 are not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed according to the target bag filter or the like.

(B) External air inlet 112
The external air induction port 112 is connected to the R-shaped inclined surface 111 and is a part that attracts external air. The opening area and the opening shape of the external air inlet 112 are not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed according to the size of the filter cloth used for the target bag filter. For example, when the diameter of the filter cloth of the bag filter is about 150 mm, the external air inlet 112 can be designed with an inner diameter of 70 to 80 mm.

(C) Amplified air outlet 113
The amplified air discharge port 113 is a portion that discharges the amplified air toward the bag filter. The opening area and opening shape of the amplified air discharge port 113 are not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed according to the size of the filter cloth used for the target bag filter. For example, when the diameter of the filter cloth of the bag filter is about 150 mm, the amplified air discharge port 113 can be designed to have an inner diameter of 70 to 80 mm.

  In the conventional bag filter air amplifying device, the external air inlet 112 and the amplified air outlet 113 are designed to have the same opening area and opening shape (see, for example, Patent Document 3 FIG. 3). In the air amplifying device 1 for bag filter according to the present invention, the external air inlet 112 and the amplified air outlet 113 can be designed to have the same opening area and opening shape as in the prior art. As in the second embodiment shown in FIG. 3, it is preferable to design the cross-sectional area of the amplified air discharge port 113 to be wider than the cross-sectional area of the external air induction port 112. The inventor of the present application has found that the air amplification efficiency is further improved by designing the cross-sectional area of the amplified air discharge port 113 wider than the cross-sectional area of the external air induction port 112.

  As a method of designing the cross-sectional area of the amplified air discharge port 113 to be larger than the cross-sectional area of the external air induction port 112, there is a method of expanding a predetermined portion of the side wall 114 described later outward. At this time, it is preferable to widen the side wall 114 outward at a portion where the Coanda effect by the compressed air injected from the compressed air injection hole 122 is at least maintained (see W in FIG. 3). The air amplification efficiency can be reliably improved by spreading the side wall 114 outward at a portion where the Coanda effect is maintained at least.

(D) Side wall 114
The side wall 114 is provided from the external air induction port 112 to the amplified air discharge port 113, and includes external air attracted from the external air induction port 112 and compressed air injected from a compressed air injection hole 122 described later. In order to guide to the amplified air outlet 113, it has a cylindrical shape. Specific aspects such as the length of the side wall 114 are not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed in accordance with the target bag filter or the like.

(2) Compressed air introduction part 12
The compressed air introduction part 12 is a part for introducing the compressed air sent from the compressed air introduction pipe 2 to be described later into the bag filter air amplifying apparatus 1 according to the present invention.

(A) Compressed air inlet 121
The compressed air introduction port 121 is a part for introducing the compressed air sent from the compressed air introduction pipe 2 described later into the compressed air introduction unit 12. The specific aspects such as the opening area and the opening shape of the compressed air inlet 121 are not particularly limited as long as the effects of the present invention are not impaired, and can be freely selected according to the target bag filter or the form of the compressed air inlet pipe 2 to be connected. Can be designed to

(B) Compressed air injection hole 122
The compressed air injection hole 122 is a part for injecting the compressed air introduced from the compressed air introduction port 121 to the air amplifying unit 11. The bag filter air amplifying device 1 according to the present invention is characterized in that the compressed air injection hole 122 is provided in the external air inlet 112 along the R-shaped inclined surface 111.

  In conventional bag filter air amplifiers, the compressed air injection holes are provided outside the R-shaped inclined surface. That is, when injecting compressed air to the air amplifying unit in order to generate the Coanda effect, it has been common knowledge that the injection angle from the compressed air inlet is designed to be perpendicular to the direction in which external air is attracted (for example, Patent Document 3 FIG. 3 code (3), specification paragraph number 0022). However, the idea is changed from the common sense in the prior art, and in the air amplifying device 1 for bag filter according to the present invention, the compressed air injection hole 122 is provided in the external air inlet 112 along the R-shaped inclined surface 111. It is characterized by that. That is, the injection angle of the compressed air from the compressed air introduction port 121 to the air amplifying unit 11 is injected along the R-shaped inclined surface 111 at an angle smaller than 90 ° with respect to the attracting direction of the external air. It is characterized by. Thus, the injection angle of the compressed air from the compressed air introduction port 121 to the air amplifying unit 11 is injected along the R-shaped inclined surface 111 at an angle smaller than 90 ° with respect to the direction in which the external air is attracted. As a result, it succeeded in dramatically improving the air amplification efficiency as compared with the conventional bag filter air amplification device.

  The compressed air injection hole 122 can be formed by a gap between a compressed air guide wall 123 described later and the R-shaped inclined surface 111. The width of the gap forming the compressed air injection hole 122 is not particularly limited as long as the effect of the present invention is not impaired, and can be freely designed according to the amount of compressed air introduced, the target ejection speed, and the like. For example, a gap for forming the compressed air injection hole 122 with a width of 0.3 to 2 mm can be designed. From the compressed air injection hole 122 of the bag filter air amplifying device 1 according to the present invention, compressed air is injected at supersonic speed. By this air injection, a Coanda effect is generated in the vicinity of the external air attracting port 112, and external air is attracted to the air amplifying unit 11. As a result, it is possible to amplify air with very high efficiency.

  FIG. 4 is an enlarged schematic cross-sectional view in which a broken-line circle portion of the second embodiment of the bag filter air amplifying device 1 according to the present invention shown in FIG. 3 is enlarged. The compressed air injection hole 122 can be formed, for example, by providing a plurality of convex portions T toward the R-shaped inclined surface 111 at predetermined intervals on the inner wall surface of a compressed air guide wall 123 described later. At this time, it is possible to freely adjust the width of the compressed air injection hole 122 by changing the height of the convex portion T.

  When providing the convex part T, the specific forms such as the size and shape are not particularly limited as long as the effects of the present invention are not impaired, and can be freely selected according to the amount of compressed air to be introduced, the target ejection speed, and the like. Can be designed.

  FIG. 5 is a schematic plan view of a third embodiment of the bag filter air amplifying device 1 according to the present invention as viewed from the bottom side. In 3rd Embodiment, the convex part T is provided along the flow direction of compressed air. Thus, by providing the convex portion T along the flow direction of the compressed air, the convex portion T rectifies the compressed air introduced from the compressed air introduction port 121 and guides it to the compressed air injection hole 122. It is also possible to provide a rectifying action.

(C) Compressed air guide wall 123
The compressed air guide wall 123 has a curved shape in order to guide the compressed air introduced from the compressed air introduction port 121 to the compressed air injection hole 122. A specific form of the compressed air guide wall 123 is not limited as long as it has at least a curved shape in order to guide the compressed air introduced from the compressed air introduction port 121 to the compressed air injection hole 122. The other structure is not particularly limited as long as the above effect is not impaired, and the structure can be freely designed according to the target bag filter or the form of the compressed air introduction pipe 2 to be connected.

  In the conventional bag filter air amplifying device, since the R-shaped inclined surface is exposed (see, for example, Patent Document 3 FIG. 3), as the operation by the bag filter continues, the finer that has passed through the filter. Dust and powder are deposited and buried on the R-shaped inclined surface. The dust and powder adhered and buried on the R-shaped inclined surface hinders the injection of compressed air from the compressed air injection hole and reduces the Coanda effect, resulting in a decrease in the air gain. It was.

  On the other hand, in the bag filter air amplifying device 1 according to the present invention, the compressed air guide wall 123 is designed so as to cover the R-shaped inclined surface 111, and therefore fine dust or powder that has passed through the filter. The body is attached and buried on the outside (upper part) of the compressed air guide wall 123. That is, dust and powder are not attached or buried on the R-shaped inclined surface 111. Therefore, the compressed air injection from the compressed air injection hole 122 is not hindered, and a stable Coanda effect can be produced in the long term. As a result, an excellent air amplification effect stable in the long term is maintained. can do. It should be noted that the dust or powder adhering or buried on the outside (upper part) of the compressed air guiding wall 123 may be removed by periodically wiping or sucking.

  Further, the conventional bag filter air amplifying apparatus is designed so that the center of the compressed air inlet is located on the same line as the apex of the curve of the compressed air guiding wall (for example, see Patent Document 3 FIG. 3). reference). Also in the bag filter air amplifying apparatus 1 according to the present invention, the center of the compressed air inlet 121 is designed to be located on the same line as the curved apex of the compressed air guiding wall 123, as in the prior art. However, it is preferable to design the center of the compressed air introduction port 121 so as to be located outside the vertex of the curve of the compressed air guide wall 123 (see the broken line arrow in FIG. 2). When the compressed air introduced from the compressed air inlet 121 collides with the compressed air guide wall 123 by making the center of the compressed air inlet 121 outside the apex of the curve of the compressed air guide wall 123, the compressed air is compressed. Air is guided toward the apex of the curve at a higher position, and can be prevented from flowing in the direction opposite to the compressed air injection hole 122. As a result, the compressed air introduced from the compressed air introduction port 121 can be guided to the compressed air injection hole 122 in a state where the compression loss is minimized.

<2. Bag Filter Air Amplification System 10>
FIG. 6 is a schematic cross-sectional view of the first embodiment of the bag filter air amplification system 10 according to the present invention as viewed from the side. The bag filter air amplifying system 10 according to the present invention includes at least the bag filter air amplifying apparatus 1 according to the present invention and the compressed air introduction pipe 2 described above. The bag filter air amplifying system 10 according to the present invention may include a fixing means 3. Hereinafter, each part will be described in detail. The details of the bag filter air amplifying device 1 according to the present invention are the same as those described above, and therefore the description thereof is omitted here.

(1) Compressed air introduction pipe 2
The compressed air introduction pipe 2 introduces compressed air into the compressed air introduction part 12 of the air amplifying device 1. The specific form such as the thickness and length of the compressed air introduction pipe 2 is not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed according to the target bag filter, the form of the installation location, and the like. it can.

  Further, the arrangement of the compressed air introduction pipe 2 is not particularly limited as long as the effect of the present invention is not impaired, and can be freely designed according to the form of the installation place. In the present invention, the air amplifier 1 It is preferable to install in the lower part of the compressed air introduction part 12 so that it may communicate with this compressed air introduction part 12. For example, like the Coanda injector described in Patent Document 2, it is theoretically possible to install a compressed air introduction pipe above the external air inlet. However, if a compressed air inlet pipe is installed at the top of the external air inlet, the air flow may be obstructed when the external air is attracted from the external air inlet, and the amount of air to be attracted may decrease. The effect may be reduced. Therefore, in the present invention, it is preferable to install the compressed air introduction pipe 2 below the compressed air introduction part 12.

  Further, the specific cross-sectional shape of the compressed air introduction pipe 2 is not particularly limited as long as the effects of the present invention are not impaired, and can be freely designed according to the form of the installation place. Particularly in the present invention, as shown in the first embodiment of FIG. 6, the connection surface of the compressed air introduction part 12 to the compressed air introduction pipe 2 and the connection of the compressed air introduction pipe 2 to the compressed air introduction part 12. It is preferable to design the surfaces so that they are parallel to each other.

  For example, as in the second embodiment of the bag filter air amplification system 10 according to the present invention shown in FIG. 7, the connection surface of the compressed air introduction part 12 to the compressed air introduction pipe 2 and the compressed air introduction pipe 2 are The connecting surface with the compressed air introduction portion 12 can be formed as a spherical surface. This is the same connection surface as the conventional bag filter air amplification system. In the conventional air amplification system for bag filters, the compressed air introduction part and the compressed air introduction pipe having a circular or elliptical cross section are connected by welding the outside (see C in FIG. 6). However, in this case, since a hole is provided in the spherical surface and connected, there is a problem that compressed air leaks from a connecting portion other than the welded portion C. This is one of the causes that cause a decrease in air amplification efficiency. It was.

  On the other hand, as in the first embodiment of the bag filter air amplifying system 10 according to the present invention shown in FIG. 6, the connection surface of the compressed air introduction part 12 with the compressed air introduction pipe 2 and the compression of the compressed air introduction pipe 2. By designing the connection surface with the air introduction part 12 to be parallel to each other, leakage of compressed air can be prevented.

  The compressed air introduction part 12 and the compressed air introduction pipe 2 can be connected by welding as in the second embodiment shown in FIG. 7, but as in the first embodiment shown in FIG. It is also possible to seal using the packing P. By connecting with the packing P, it becomes possible to easily remove the air amplifier 1 for bag filter from the compressed air introduction pipe 2, and it becomes necessary to replace the single item due to breakage or to urgently close the filter cloth hole. Etc.

  In addition, the number of compressed air introduction pipes 2 provided in the bag filter air amplification system 10 according to the present invention is not particularly limited as long as the effects of the present invention are not impaired, and one or two according to the form of the installation location. It is also possible to provide more than one. In the present invention, the number of compressed air introduction pipes 2 is particularly preferably one. When a plurality of compressed air introduction pipes 2 are installed, since a single pipe is usually branched into a plurality of pipes, the air compression rate is lowered by branching, and the compressed air introduction pipe 2 is introduced into the bag filter air amplifier 1. Compressed air volume may decrease. In this case, the Coanda effect in the air amplifying device 1 for bag filter is also reduced, and as a result, the air amplification factor may be reduced.

  When a plurality of compressed air introduction pipes 2 are installed, a plurality of compressed air introduction ports 121 are also provided. The compressed air introduced from the plurality of compressed air introduction ports 121 is contained inside the compressed air introduction unit 12. In rare cases, the flow may interfere with each other. In this case, the injection speed of the compressed air from the compressed air injection hole 122 decreases, and as a result, the air amplification factor may be decreased.

  On the other hand, if the number of the compressed air introduction pipes 2 is one, it is possible to prevent a reduction in the compression rate of the air due to the branching of the pipes, and between the compressed air introduced inside the compressed air introduction section 12. Interference can be suppressed, and as a result, an excellent air amplification effect can be maintained.

  FIG. 8 is a schematic perspective view schematically showing a third embodiment of the air amplification system 10 for a bag filter according to the present invention. In the third embodiment, a compressed air guide plate 4 is provided at a connection portion between the compressed air introduction portion 12 and the compressed air introduction pipe 2. The compressed air guide plate 4 is not essential in the present invention, but can be provided to guide the introduction of the compressed air A from the compressed air introduction pipe 2 to the compressed air introduction part 12.

  Since the compressed air A is introduced into the compressed air introduction pipe 2 in one direction (see arrow A in FIG. 8), depending on the compression rate and introduction speed of the compressed air A, In some cases, the air may be introduced into the compressed air introduction section 12 along the flow. Further, since there are many cases in which 8 to 9 devices 1 are arranged in one lane in an actual site, the compressed air introduction section 12 becomes more downstream in the direction of introduction of the compressed air A in the compressed air introduction pipe 2. The amount and pressure of air introduced into the apparatus may increase, and it may be difficult to stably introduce the compressed air A to each device 1. Therefore, if the compressed air guide plate 4 is provided at the connecting portion between the compressed air introduction part 12 and the compressed air introduction pipe 2, the compressed air is compressed to the compressed air introduction part 12 at an angle close to perpendicular to the compressed air introduction pipe 2. Air A can be introduced. Further, even when a plurality of devices 1 are arranged in one lane, the amount and pressure of compressed air A introduced into each device 1 can be kept constant, and the compressed air A can be stably introduced. .

  The installation location of the compressed air guide plate 4 is particularly suitable if the introduction of the compressed air A from the compressed air introduction pipe 2 to the compressed air introduction section 12 can be guided at an angle close to the perpendicular to the compressed air introduction pipe 2. It is not limited. It can be installed upstream of the compressed air inlet 121 as in the third embodiment of FIG. 8, or is installed in the center of the compressed air inlet 121, for example, as in the fourth embodiment of FIG. It is also possible. Particularly in the present invention, in order to guide at an angle close to perpendicular to the compressed air introduction pipe 2, it is preferably installed upstream from the center of the compressed air introduction port 121, and the most upstream of the compressed air introduction port 121. More preferably, it is installed on the side.

  Further, the compressed air guide plate 4 can be installed in a state of protruding to the upper part of the compressed air introduction port 121 to such an extent that the air flow of the compressed air introduction unit 12 is not hindered.

  Furthermore, the compressed air guide plate 4 may be installed in a state connected to the compressed air introduction pipe 2 side, may be installed in a state connected to the compressed air introduction part 12 side, or the compressed air introduction pipe 2. And you may install in the state connected to both the compressed air introduction parts 12. FIG.

  In addition, the configuration of the compressed air guide plate 4 can also guide the introduction of the compressed air A from the compressed air introduction pipe 2 to the compressed air introduction section 12 at an angle close to the perpendicular to the compressed air introduction pipe 2. However, it is not particularly limited, and can be freely designed according to the shape of the compressed air inlet 121, the installation location, and the like. For example, when the compressed air guide plate 4 is installed on the uppermost stream side of the elliptical compressed air inlet 121 as in the third embodiment, the compressed air guide plate 4 having a curved shape in an R shape is used. preferable. Moreover, when installing the compressed air guide plate 4 in the center part of the compressed air introduction port 121 like 4th Embodiment, although not shown in figure, the compressed air introduction port 121 is not shown. It is preferable to use an L-shaped compressed air guide plate 4 as a bottom surface.

(2) Fixing means 3
FIG. 10: is the cross-sectional schematic diagram which looked at 5th Embodiment of the air amplification system 10 for bag filters based on this invention from the side surface. In 5th Embodiment, the fixing means 3 which fixes the air amplification apparatus 1 is further provided. The fixing means 3 is not essential in the present invention, but by providing the fixing means 3, the horizontality of the bag filter air amplifying device 1 can be maintained.

  Usually, when performing maintenance of the bag filter, a person may move on the air amplification system 10 for the bag filter. In this case, for example, in the first embodiment shown in FIG. 6 and the second embodiment shown in FIG. 7, the bag filter air amplifying device 1 is supported only by the compressed air introduction pipe 2. As a result, the bag filter air amplifying device 1 may be inclined.

  On the other hand, if a fixing means 3 for fixing the air amplification device 1 is further provided as in the fifth embodiment of the bag filter air amplification system 10 according to the present invention shown in FIG. The inclination of the air amplifying device 1 can be prevented and its horizontality can be maintained, and as a result, an excellent air amplifying effect can be maintained.

  Hereinafter, the present invention will be described in more detail based on examples. In addition, the Example demonstrated below shows an example of the typical Example of this invention, and, thereby, the range of this invention is not interpreted narrowly.

  <Experimental example 1> In Experimental example 1, it was investigated whether the inflow efficiency of compressed air to the air amplifier and the air amplification effect would change due to the difference in the form of each part of the bag filter air amplifier. Specifically, as an example of the air amplifier for a bag filter according to the present invention, the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIG. 3, and an example of a conventional bag filter air amplifier. As a comparison, the inflow efficiency of compressed air into the air amplifier and the air amplification efficiency were compared using a single compressed air introduction pipe of the apparatus shown in FIG.

(1) Details of the apparatus used in the experiment The details of the bag filter air amplifying apparatus used in Experiment 1 are shown in Table 1 below.

(2) Experimental Method 5 atmospheres of compressed air is allowed to flow through the compressed air introduction pipe of the air amplification system for bag filters according to Examples 1 and 2 and Comparative Example 1 for 0.1 second, and the amount of compressed air flowing into the air amplification unit And the amount of air flowing out from the amplified air outlet. The theoretical value of the inflow amount of compressed air into the air amplifier is calculated based on the following formulas (1) to (3), and the inflow efficiency is calculated from the calculated inflow amount (theoretical value) and the measured compressed air inflow amount. Calculated. Further, the air amplification efficiency (outflow air amount / compressed air inflow amount) was calculated from the measured compressed air inflow amount and outflow air amount. The experiment was terminated when the respective values reached equilibrium.

ρ：気体の密度
ｕ：流速
Ａ：流路の断面積

ρ: Gas density u: Flow velocity A: Cross-sectional area of the flow path

ρ０：澱み密度

ρ0: starch density

ｒ：圧縮空気噴射孔の空気増幅部の中心からの位置
ｓ：圧縮空気噴射孔の幅（スリット幅）

r: position of the compressed air injection hole from the center of the air amplification part s: width of the compressed air injection hole (slit width)

(3) Results The results are shown in Table 2 below.

  As shown in Table 2, the amount of outflow air when using the bag filter air amplification system according to Example 2 was increased by 20% from 0.456 kg / sec to 0.547 kg / sec, as compared with Comparative Example 1 which is a conventional product. Was. Furthermore, when the bag filter air amplification system according to Example 1 was used, the outflow air amount was 0.595 kg / sec, an increase of 30%.

  In addition, compared with the comparative example 1 which is a conventional product, the compressed air inflow rate when using the bag filter air amplification system according to Examples 1 and 2 is also increased by 16% from 0.118 kg / sec to 0.137 kg / sec. Was. From this result, it was confirmed that the air amplification system for a bag filter according to the present invention has a significant increase in not only the air amplification factor but also the inflow efficiency of compressed air as compared with the conventional product. That is, it was shown that the air amplification system for bag filters according to the present invention can realize a high air amplification effect with less compressed air than the conventional product.

<Experimental example 2>
In Experimental Example 2, it was further investigated whether the inflow efficiency of compressed air into the air amplifying unit and the air amplifying effect were changed depending on the form of each part of the bag amplifying device. Specifically, as an example of the bag filter air amplifying device according to the present invention, the second embodiment shown in FIG. 3, and as an example of a conventional bag filter air amplifying device, the device shown in FIG. It was used to compare the inflow efficiency of compressed air to the air amplifier and the air amplification efficiency.

(1) Details of the apparatus used in the experiment The details of the bag filter air amplifying apparatus used in Experimental Example 2 are shown in Table 3 below.

(2) Experimental Method Using the compressed air introduction pipe of the bag filter air amplification system according to Example 3 and Comparative Example 2, the amount of compressed air flowing into the air amplification unit and amplification in the same manner as in Experimental Example 1 The amount of outflow air from the air outlet was measured. Further, a theoretical value of the inflow amount of compressed air into the air amplifying unit is calculated based on the formulas (1) to (3), and the inflow is calculated from the calculated inflow amount (theoretical value) and the measured compressed air inflow amount. Efficiency was calculated. Further, the air amplification efficiency (outflow air amount / compressed air inflow amount) was calculated from the measured compressed air inflow amount and outflow air amount. The experiment was terminated when the respective values reached equilibrium.

(3) Results The results are shown in Table 4 below.

  As shown in the results of Table 4, the amount of outflow air when using the bag filter air amplification system according to Example 3 from 0.40 kg / sec to 0.48 kg / sec as compared with Comparative Example 2 which is a conventional product. It increased by 20%.

  Moreover, compared with the comparative example 2 which is a conventional product, the inflow efficiency when the bag filter air amplification system according to the example 3 was used was also increased from 81% to 91%. From this result, in the air amplification system for a bag filter according to the present invention, not only the compressed air introduction pipe has two compressed air introduction pipes, but also the air amplification factor, It was confirmed that the inflow efficiency of compressed air was also increased significantly. That is, it was shown that the air amplification system for a bag filter according to the present invention can achieve a high air amplification effect with less compressed air than the conventional product.

<Experimental example 3>
In Experimental Example 3, the change in the wind speed at the amplified air discharge port due to the difference in the form of each part of the air amplifier for bag filter, the difference in the inflow air pressure, the difference in the injection time and the injection interval was examined. Specifically, as an example of the bag filter air amplifying device according to the present invention, the second embodiment shown in FIG. 3, and as an example of a conventional bag filter air amplifying device, the device shown in FIG. Using, the wind speed at the amplified air outlet was compared. As the devices of Example 4 and Comparative Example 3, the same devices as those of Example 3 and Comparative Example 2 used in Experimental Example 2 were used.

(1) Experimental method Compressed air of the pressure shown in Table 5 below is applied to the compressed air introduction pipes of the air amplification system for bag filter according to Example 4 and Comparative Example 3, respectively, and the injection time shown in Table 5 below and Injection was performed at the injection interval, and the wind speed at the amplified air outlet was measured.

(2) Results The results of wind speed at the amplified air outlet are shown in Table 5 below.

  As shown in Table 5, when the bag filter air amplifying system according to Example 4 is used as compared with Comparative Example 3 which is a conventional product, amplification is performed regardless of the difference in inflow air pressure, the injection time, and the injection interval. It was confirmed that the wind speed at the air outlet increased.

  Experimental examples 1 to 3 described above are all results of one apparatus. Since there are many cases where 8 to 9 devices are arranged in one lane in an actual site, it is considered that there is a greater difference between the conventional product and the product of the present invention than the result of this experimental example. That is, if the bag filter air amplification system according to the present invention is used, a very high air amplification efficiency can be realized even in an actual site where 8 to 9 devices are connected in one lane. Can be improved.

  In addition, the air amplification system for bag filter according to the present invention can realize a very high air amplification efficiency compared to the conventional product, and thus it is large (long) that a conventional backwashing effect cannot be obtained sufficiently. It is considered that it can be suitably used for a bag filter.

DESCRIPTION OF SYMBOLS 1 Bag filter air amplifier 11 Air amplifier part 111 R-shaped inclined surface 112 External air attracting port 113 Amplified air discharge port 114 Side wall 12 Compressed air introduction part 121 Compressed air inlet 122 Compressed air injection hole 123 Compressed air guide wall 10 Bug Filter air amplification system 2 Compressed air introduction pipe 3 Fixing means 4 Compressed air guide plate

Claims (1)

For a bag filter comprising an air amplifying device used for backwashing the bag filter, a single compressed air introduction pipe for introducing compressed air into the air amplifying device, and a fixing means for fixing the air amplifying device An air amplification system,
(A) The air amplifier is
Compressed air introduction port for introducing compressed air, the compressed air introduction port is provided in a part, a portion other than the compressed air introduction port is a substantially flat bottom wall portion, and the compressed air is supplied to the air amplifying unit Compressed air injection holes for injection, a curved compressed air guide wall for guiding compressed air introduced from the compressed air introduction port to the compressed air injection holes, the bottom wall portion, and the compressed air guide wall And a compressed air introduction part provided with a compressed air flow part having a substantially semicircular cross section in the vertical direction through which compressed air introduced from the compressed air introduction port flows. ,
An R-shaped inclined surface that spreads outward, an external air induction port that is connected to the R-shaped inclined surface to attract external air, an amplified air discharge port that discharges amplified air, and the external air attraction A cylindrical side wall provided from the mouth to the amplified air discharge port, and an air amplifying part provided with,
(B) The one compressed air introduction pipe is
Introducing compressed air into the compressed air introduction part of the air amplifier,
(C) Furthermore, the one fixing means includes:
All SANYO for fixing the air amplifier to maintain the horizontality of the air amplifier
(D) A compressed air guide plate that guides introduction of compressed air from the compressed air introduction pipe to the compressed air introduction section at a connection portion between the compressed air introduction section and the compressed air introduction pipe of the air amplifier. the compressed air inlet of the air amplifier system for a bag filter, characterized that you have provided in a state protruding to the upper.

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