• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In order to achieve improved cleaning of a tubular filter bag when a reverse flow of purging air is directed into the filter bag, there is provided interiorly of the filter bag a perforated tube (30) which is constructed in such a way as to support and hold the filter bag in an open tubular configuration and also to diffuse and distribute air when a reverse flow of purging air is directed into the filter bag for cleaning the latter. The tube (30) has peripheral portions (31) extending outwardly from other portions (32) of the tube for engaging and holding the surrounding filter bag, and the other portions (32) of the tube located inwardly therefrom have perforations (34) for diffusing and distributing the reverse purge of air directed into the filter bag.
    公开号:SU1367842A3
    申请号:SU802986745
    申请日:1980-09-25
    公开日:1988-01-15
    发明作者:Старлинг Джонсон Аллен (Младший)
    申请人:Аллен Старлинг Джонсон (младший) (US)；
    IPC主号:
    专利说明:

    This invention relates to a filtering device having elongated bag-like tubular filter elements for filtering gas streams.
    The purpose of the invention is to increase the cleaning efficiency of the filter bag and increase the service life.
    FIG. 1 shows a filtering device; a section J in FIG. 2 is a filter bag with a perforated tube disposed therein; on fig.Z - section aa in figure 2; figure 4 - per
    In the device, purge air is supplied from a source of compressed air to the chamber 4 of filtered air by opening for a short time the valve 9 installed on the line 10 of the compressed air supply. At the same time, the valve 11 from the position shown by the solid line moves to the position indicated by the straight line, using an appropriate actuator 12, for example a pneumatic or hydraulic piston, and blocks the opening
    forged pipe; Fig. 5 shows a perforated 15 for the release of compressed air into the exhaust pipe, in which the perforation channel 7. Therefore, compress
    They are unevenly distributed and form a large hollow zone near one end of the pipe and a smaller hollow zone near the other opposite end.
    The filter device includes a housing 1, which is divided by a horizontal wall 2 into a lower filter chamber 3 and an upper chamber 4 of filtered air. Inside the filter chamber 3, vertically installed are a plurality of tubular filter bags 5 with an open outlet end that communicates with the filtered air chamber 4.
    Through the intake duct 6, the gas containing fine particles is directed to the filter chamber 3, where it passes through the respective filter bags 5, and then seeps through the gas-permeable filter bags, while small particles are separated, trapping on the outer surface of the filter bags. . After passing into the internal cavity of the filter bags, the filtered gas is directed upwards and through the output ends of the respective filter bags enters the chamber 4 of filtered air. Further, the filtered gas is directed from this chamber to exhaust port 7.
    With the accumulation of small particles on the outer surface of the filter bags 5, there is a need to clean the filter bags and remove small particles from them.
    This is achieved by periodically purging the filter bags with an air flow having the opposite direction. In the proposed filter air in the opposite direction is fed to the output ends of the corresponding filter bags 5. Remote
    0 from the filter bags, the particulate material is collected in the lower part of the housing 1 and discharged by the conveyor screw 13.
    Filter cleaning system used in the filter device
    (Fig. 1) refers to this type of systems in which all tubular filtering materials are simultaneously blown with a pulsed jet of compressed air.
    0 cabins connected to the filtered air chamber. In another known cleaning system used in this type of filtering device, the compressed air supply lines are connected to the outlet ends of each of the respective filter bags so that the stream of compressed air can be selectively directed to the respective filter bags. Another well-known type of cleaning system provides for the supply for cleaning of filter bags not a pulsed jet of air, but a reverse flow of air of a longer duration.
    5 I
    In FIG. 4, reference numeral 14 denotes a tube, in general, combining a bag holder and an air diffuser, which is made in accordance with a VII with a first embodiment of the invention. An elongated perforated tube 14 is installed along the filter bag 5, which is designed so that it can serve both to hold the filter bag and hold it in the opened tubular position, as well as to a tubular air diffuser for dispersing and distributing air through the filter 5
    0
    ten
    20
    the bag when the purge air is periodically sent back to it.
    Consistent with FIG. 4, tube 14 has a plurality of outer ribs 15 spaced apart from one another along the periphery of the tube, seeking contact with the filter bag enclosing the tube and keeping the latter in an opened tubular position. The ribs 15 are laminated along the entire length of the tube 14 and protrude outwardly in the radial direction. The ribs 15 have the same height, are located around the circumference of the pipe at the same distance from one another and are formed by bending of the pipe wall. Each rib 15 preferably has on its outer edge 16 an enlarged rounded or bulbous formation having a rounded smooth surface intended to contact the filter bag encircling the pipe, thereby reducing the wear of the filter bag in this area. Ribs 15 are not perforated. They are of such size and intermediate distance with each other, which ensure that the filtering bag 5 is maintained in the open tubular position, preventing contact of the latter with intercostal parts located closer to the inner cavity of the latter.
    In normal filtration operation, the perforated pipe 14 passes filtered air passing through the filter bag 5 into the internal cavity of the pipe 14, from where it then enters the chamber 4 of filtered air. When performing the cleaning operation of the perforated pipe 14, when in the internal cavity
    pipe 14. The outer edge of the end ring 17 protrudes beyond the outer edge 16 of the ribs 15, whereby a flange is formed at the upper end of the pipe, which makes it easier for the pipe 14 to fit to the horizontal wall 2 of the housing 1. A ring 18 is located below the end ring 17 surrounding the fins 15 and which facilitates the attachment of the filter bag 5 to the pipe 14. The lower end of the pipe 14 is closed with an end cap 19.
    The tube 14 may be made of any suitable material capable of withstanding the conditions that the filter system is subjected to. A ductile metal sheet, such as steel or stainless steel, is suitable for making the pipe, and other materials and other manufacturing methods can also be used.
    One of the main reasons for the inefficient cleaning of the known conventional filter bag design is that the impulse or jet in the direction of the purge air is concentrated in the 30 zone located near the inner cavity of the filter into which it enters, namely near the output end of the filter . The effect of the reverse blowdown jet essentially disappears at the far end of the filter with respect to the air outlet. Thus, if the backwash of the purge air acts on the outlet end of the filter and excessively cleans it, the far end of the filter remains uncleaned. As a result, not the entire length of the filter bag is effectively used for filtering, and therefore the efficiency of the filter is reduced. Pipe 14 according to the invention.
    25
    35
    40
    the tubes 14 supply a jet or pulse combining the bag holder
    The stream of purge air, the ribs 15, serve to scatter and distribute the reverse stream of purge air through the filter bag so that all areas of the latter are effectively cleaned with a backwash.
    At the upper end of the pipe 14, which serves as an outlet for filtered air in the device, there is a circular end ring 17, the inner diameter of which corresponds to the internal diameter 0
    0
    five
    pipe 14. The outer edge of the end ring 17 protrudes beyond the outer edge 16 of the ribs 15, whereby a flange is formed at the upper end of the pipe, making it easier for the pipe 14 to align against the horizontal wall 2 of the housing 1. A ring 18 is located at the upper end of the pipe 14, a bottom edge 15 and which facilitates the attachment of the filter bag 5 to the pipe 14. The lower end of the pipe 14 is closed with an end cap 19.
    The tube 14 may be made of any suitable material capable of withstanding the conditions that the filter system is subjected to. A ductile metal sheet, such as steel or stainless steel, is suitable for making the pipe, and other materials and other manufacturing methods can also be used.
    One of the main reasons for the inefficient cleaning of the conventional conventional filter bag design is that the pulse or jet of the purge air directed in the direction of rotation is concentrated in the zone located near the internal cavity of the filter into which it enters, namely near the outlet end of the filter. The effect of the reverse blowdown jet essentially disappears at the far end of the filter with respect to the air outlet. Thus, if the backwash of the purge air acts on the outlet end of the filter and excessively cleans it, the far end of the filter remains uncleaned. As a result, not the entire length of the filter bag is effectively used for filtering, and therefore the efficiency of the filter is reduced. Pipe 14 according to the invention.
    five
    five
    0
    bag holder
    and the air diffuser, performs the function of dispersing and distributing the pulse or air flow over the entire filter bag, thereby providing a much more efficient and productive cleaning of the latter. It has been found that, due to the dispersion and distribution of the impulse or stream of purge air, the fine particles are removed from the filter bag by 30% by weight more. In addition, due to improved cleaning, the volume of
    spirit that can pass through the filter at a given pressure drop.
    The concentration of the jet of cleaning air in the zone of the output end of the filter in the known device led to an excessive deflection of the filter bag in this zone. A more even distribution of the cleaning air, produced by incorporating into the design of the pipe 14, avoids such excessive bending of the filter bag and thereby contributes to an increase in the service life of the latter. .
    20
    Another factor that previously contributed to the wear of the filter bag is the high-speed air flow along the internal surfaces of the filter bag in the area of the outlet end of the filter bag. When the air velocity during the passage of the latter through the filter bag is small, the air velocity inside the filter bag in the area of the outlet end of the latter will be higher due to a decrease in the throughput area of the cross section relative to the total surface area of the filter cake. This high-speed air flow, together with dust particles, the passage through the filter bag and entrained into the air flow, normally passes through the inner surface of the filter bag, causing additional wear and abrasion of the filter bag. Installation inside
    thirty
    35
    the purge air, and a higher percentage of the void zone near the full end of the pipe, can change the void zone in order to enhance the effect of the back flow of the purge air at the far end of the pipe and thereby achieve a more efficient distribution of the reverse air flow along the longitudinal length of the pipe. Thus, according to FIG. 5, where pipe 14 has hollow zones formed by perforations, the latter varies along the longitudinal length of the pipe. This is achieved by changing the distance between successive rows of perforations. The brackets in figure 5 show that pipe 14 has four distinct regions of the variable winding zone. In the upper region 20, which is closest to the point where the reverse air flow enters the pipe, the rows of perforations are located at a relatively large distance from one another. In the subsequent regions 21, 22 and -23, the distance between the rows of perforations decreases more and more. Consequently, the percentage of the void zone will be relatively low in the upper region closest to the point where the return pipe enters the pipe, and relatively high in the region 23 near the opposite end of the pipe.
    权利要求:
    Claims (3)
    [1]
    Invention Formula
    1, Filtering device, including a tubular filter bag with an open upper code end
    perforated filter bag 40 along the filter bag
    The pipes 14 according to the invention make it possible to separate or isolate the inner surface of the filter bag from this high-speed air flow, which also contributes to an increase in the service life of the filter bag.
    The perforation of the pipe 14 is preferably of such a size and with such a prostrate distance such that the hollow zone of the pipe 14 is approximately 35-50%. In some cases, the void zone (depending on the length and diameter of the filter and other factors) it is advisable to vary the length of the elongated tube 14. By installing a smaller percentage of the hollow zone of the ecological end of the tube, which is glare to the exit zone
    45
    50
    55
    an elongated perforated pipe was installed to diffuse and distribute the purge air sent to the pipe periodically inversely by the flow, characterized in that, in order to increase the cleaning efficiency of the filter bag and increase the service life, the perforated pipe was made with external fins located at from each other along its circumference and adjacent outer ends to the filter bag.
    [2]
    2. The device according to claim 1, about tl and - so that the edges are made of the same height.
    [3]
    3. A device according to claim 1, characterized in that the edges are made radial.
    0
    five
    0
    25
    thirty
    35
    the purge air, and a higher percentage of the void zone near the anti-full end of the pipe, the void zone can be modified to enhance the effect of the return flow of the purge air at the far end of the pipe and thereby achieve a more efficient distribution of the return air flow along the longitudinal length of the pipe. Thus, according to Fig. 5, where the pipe 14 has hollow zones formed by perforations, the latter varies along the longitudinal length of the pipe. This is achieved by changing the distance between successive rows of perforations. The brackets in FIG. 5 show that pipe 14 has four distinct regions of the variable void zone. In the upper region 20, which is closest to the point where the reverse air flow enters the pipe, the rows of perforations are located at a relatively large distance from each other. In the subsequent regions 21, 22 and -23, the distance between the rows of perforations decreases more and more. Consequently, the percentage of the void zone will be relatively low in the upper region closest to the point of entry of the return air flow into the pipe, and relatively high in the region 23 located near the opposite end of the pipe.
    Invention Formula
    1, Filtering device including a tubular filter bag with an open top pin code
    along the filter bag
    an elongated perforated pipe was installed to diffuse and distribute the purge air sent to the pipe periodically by the return flow, characterized in that, in order to increase the cleaning efficiency of the filter bag and increase the service life, the perforated pipe was made with external fins spaced apart from each other around its circumference and adjacent outer ends to the filter bag.
    2. The device according to claim 1, about tl and - so that the edges are made of the same height.
    3. A device according to claim 1, characterized in that the edges are made radial.
    / .13678428
    A. The device according to Claim 1, of which the apertures of the perforated pipe increase due to the fact that the number is attributed to its end.
     eight
    vV
    gd
    17
    1b
    FIG. 2
    .sixteen
    FIG. five
    1
    Editor M.Kelemes
    Compiled by I.Dybovska Tehred A. Kravchuk
    COQ
    dcp
    ox
    Yes
    L
    FIG. five
    Proofreader S. Shekmar
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    法律状态:
    优先权:
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