CN114797311A

CN114797311A - Low-voltage pulse long-bag dust collector

Info

Publication number: CN114797311A
Application number: CN202210470274.1A
Authority: CN
Inventors: 郑楠; 杨晨
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-07-29

Abstract

The invention relates to the technical field of dust removing equipment, in particular to a low-voltage pulse long-bag dust remover; the invention comprises a shell, a top cover and an ash bucket, wherein the bottom of the shell is provided with an air inlet, the top of the shell is provided with an air outlet, the shell is divided into an upper box body, a middle box body and a lower box body by an upper fixing plate and a lower fixing plate, the upper fixing plate and the lower fixing plate are arranged in the shell, the invention is characterized in that an air injection unit and a centrifugal unit are arranged in the upper box body, a filtering unit is arranged in the middle box body, and the air injection unit is arranged right above the filtering unit. When the dust removing device is used for removing dust, the air inlet and the air outlet are closed, the shell is in a state without air flowing, the centrifugal unit is used for driving the filtering unit to rotate, when the rotating speed of the filtering unit reaches a preset value, the air injection unit utilizes pulse gas to perform air injection treatment on the filtering unit, the filtering unit has a centrifugal effect under the driving of the centrifugal unit, and the dust removing efficiency is improved by combining the centrifugal unit and the air injection unit.

Description

Low-voltage pulse long-bag dust collector

Technical Field

The invention relates to the technical field of dust removing equipment, in particular to a low-voltage pulse long-bag dust remover.

Background

The long-bag low-pressure pulse dust collector is high-efficiency bag type dust collecting equipment with advanced level, is large-scale dust collecting equipment with large air handling quantity, good dust cleaning effect, high dust collecting efficiency, reliable operation and small occupied area, and is very commonly applied to various large coal-fired power plants in China. The overall equipment working stability of the low-pressure pulse type bag-type dust collector equipment is relatively high, the national requirement standards are met on the dust collection working efficiency and the smoke emission concentration, along with the continuous promotion of the manufacturing level, the application prospect of the bag-type dust collector equipment in the middle of a thermal power plant is wider, and the exhibited economic benefit and social benefit are more obvious.

The problems of long service life, poor working environment and the like of the dust remover are solved, the surface of the filter cloth bag adsorbs dust which is difficult to clean by pulse gas, the abrasion of the filter cloth bag is aggravated, the filtering effect is reduced, the emission requirement cannot be met, and the working efficiency of the dust remover is reduced.

Among the prior art, the clearance adsorbs when filtering sack surface dust, it is inside to filtering the sack to spray pulse gas through pulse valve, thereby reach the purpose of clearance dust, but because the operational environment of dust remover is abominable, contain a large amount of debris and moisture in the air, the dust is after mixing with moisture, the adhesion is on filtering the sack surface, pulse gas is difficult to the clearance, long-term not only can aggravate the wearing and tearing of filtering the sack in the past, thereby can reduce filterable effect moreover and can not reach the emission requirement, thereby reduce the work efficiency of dust remover.

After the dust remover works for a certain time, the filtered gas cannot reach the discharge standard due to the abrasion of the filter cloth bag, the filter cloth bag needs to be replaced, the air in the dust remover contains a large amount of dust, the dust remover is not suitable for manual replacement, and the internal structure of the dust remover needs to be changed so as to facilitate the replacement of the filter cloth bag.

Disclosure of Invention

The technical problems to be solved by the invention are as follows:

1. how to drive the filtering unit to realize autorotation and make dust separated from the filtering cloth bag under the action of centrifugal force.

2. In order to facilitate the disassembly and assembly of the filtering unit, the upper fixing plate is driven to ensure that the filtering unit is not influenced by the air injection unit when being disassembled and assembled.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a low-voltage pulse long-bag dust collector comprises a shell, a top cover and an ash bucket, wherein an air inlet is formed in the bottom of the shell, an air outlet is formed in the top of the shell, the shell is divided into an upper box body, a middle box body and a lower box body by an upper fixing plate and a lower fixing plate, the upper fixing plate and the lower fixing plate are installed in the shell, an air injection unit and a centrifugal unit are arranged in the upper box body, a filtering unit is installed in the middle box body, and the air injection unit is installed right above the filtering unit; the surface of the lower fixing plate is provided with a hole, the centrifugal unit is arranged on the upper surface of the upper fixing plate, and the centrifugal unit is used for driving the filtering unit to rotate.

The filtering unit comprises a spacer bush, a cage bar shaft sleeve, a cage bar, a mounting ring, a cloth bag filter screen, a coupler and a flange plate, and the spacer bush is coaxially and fixedly connected with a hole formed in the upper fixing plate; the cage bone shaft sleeve is arranged in the stepped hole of the spacer sleeve, the two symmetrical parts of the cage bone shaft sleeve are provided with orientation blocks, a counter bore is arranged in the cage bone shaft sleeve, and the cage bone is fixedly connected inside the counter bore; the bag filter screen is sleeved outside the cage frame, and the top of the bag filter screen is fixedly arranged on the shaft sleeve of the cage frame through the flange plate; the mounting ring is rotatably connected to the top of the spacer bush, a limiting hole matched with the external shape of the cage shaft sleeve is formed in the mounting ring, the cage shaft sleeve is mounted in the limiting hole in the mounting ring, and a transmission component is arranged at the outer end of the mounting ring; the lower part of the filtering unit is connected with the lower fixing plate through the coupler.

The centrifugal unit comprises a driving chain wheel, a driving shaft, a driven chain wheel, a chain, a tension wheel shaft and a centrifugal motor, wherein the driving chain wheel is arranged above the upper fixing plate through the driving shaft, and the driving shaft is coaxially and fixedly connected with a hole formed in the upper fixing plate; the driven chain wheel is arranged on the outer side of the mounting ring, and the driving chain wheel is in power connection with the driven chain wheel through the chain; the tensioning wheel is arranged on the upper surface of the upper fixing plate through the tensioning wheel shaft, and the tensioning wheel shaft is coaxially and fixedly connected with the shaft hole of the upper fixing plate; the centrifugal motor is in power connection with the driving chain wheel through a support.

The inner side of the shell is provided with two bosses, the upper fixing plate is installed above the bosses on the shell and is rotationally connected with the bosses on the shell, the inner gear ring is arranged on the upper surface of the upper fixing plate, the rotating motor is installed on the inner side of the shell through a motor support, and the gear is fixedly installed on the rotating motor and is meshed with the inner gear ring; the lower fixing plate is arranged above the lower boss of the shell and is rotationally connected with the lower boss; the upper fixing plate is connected with the lower fixing plate through a pipe shaft.

The shaft coupling includes magnet, magnet and ball hinge No. one, the installation of filter unit below magnet No. one, magnet No. two is installed the top of ball hinge and with a magnet adsorb each other together, the below fixed mounting of ball hinge is on the bottom plate.

The internal surface of spacer bottom is equipped with the sealing washer of silica gel material.

The centrifugal unit is provided with a plurality of groups, each group of the centrifugal unit controls the filtering units in one row or one column, and the rotating directions of the filtering units in the adjacent row or one column are opposite.

The top cover comprises a top cover shell, a fan blade shaft, a shaft support and fan blades, the top cover shell is fixedly installed above the shell, the fan blade shaft is fixedly installed in the top cover shell through the shaft support, and the fan blades are connected with the fan blade shaft in a coaxial and rotating mode through shaft holes formed in the fan blades.

The invention has the following beneficial effects:

1. the invention provides a low-pressure pulse long-bag dust collector, which utilizes a centrifugal unit to drive a filtering unit to carry out first-step dust removal, so that dust on the surface of a filtering bag is separated from the surface of the bag under the action of centrifugal force; after filter unit's rotational speed is stable, carry out the deashing of second step, utilize jet-propelled unit to jet-propelled inside the filter unit, the blowout gas is cleared up the dust of remaining on filtering the sack surface, mutually supports through centrifugal unit and jet-propelled unit, not only can reduce the impact of second step deashing in-process pulse gas to filtering the sack, increases the life of filtering the sack and can improve deashing efficiency and effect.

2. The invention provides a low-voltage pulse long-bag dust collector, which drives an upper fixing plate to rotate through a rotating motor arranged above the upper fixing plate and a magnet coupler arranged below a filtering unit, and aims to facilitate the disassembly and replacement of the filtering unit. And the magnet coupling can ensure that the filter unit swings in a small range in the rotating process, so that dust is centrifugally shaken off in the rotating process of the filter unit.

3. The invention provides a low-pressure pulse long-bag dust collector, which utilizes a transmission mode of a chain wheel and a chain in a centrifugal unit, on one hand, the filter unit is more convenient and quicker to detach and replace, and on the other hand, the filter unit can generate smaller swing in the dust cleaning process due to rotation, and the transmission mode of the chain wheel and the chain can ensure the stable transmission between the centrifugal unit and the filter unit.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the top cover structure of the present invention;

FIG. 4 is a cross-sectional view of a single filter unit of the present invention;

FIG. 5 is a schematic view of the coupling of the present invention;

FIG. 6 is a schematic view of a centrifuge unit of the present invention;

fig. 7 is a schematic view of the dust disengaging movement of the present invention.

In the figure: the device comprises a shell 1, a top cover 2, an ash bucket 3, an air inlet 11, an air outlet 12, an upper fixing plate 13, a lower fixing plate 14, a rotating motor 15, a gear 16, an inner gear ring 17, an air injection unit 4, a centrifugal unit 5, a filtering unit 6, a spacer 61, a cage shaft sleeve 62, a cage 63, a mounting ring 64, a cloth bag filter screen 65, a coupler 66, a flange 67, a driving sprocket 51, a driving shaft 52, a driven sprocket 53, a chain 54, a tensioning wheel 55, a tensioning wheel shaft 56, a centrifugal motor 57, a first magnet 661, a second magnet 662, a ball hinge 663, a top cover shell 21, a fan blade shaft 22, a shaft bracket 23 and fan blades 24.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete description of the technical solutions in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the drawings and the specific embodiments;

as shown in fig. 1 to 7, the low-pressure pulse long bag-type dust collector of the present invention comprises a housing 1, a top cover 2 and an ash bucket 3, wherein the bottom of the housing 1 is provided with an air inlet 11, impurity-containing gas enters the housing 1 through the air inlet 11, the top of the housing 1 is provided with an air outlet 12, the filtered gas is discharged from the air outlet 12, the housing 1 is divided into an upper box body, a middle box body and a lower box body by an upper fixing plate 13 and a lower fixing plate 14, the upper fixing plate 13 and the lower fixing plate 14 are installed in the housing 1, the upper box body is internally provided with an air injection unit 4 and a centrifugal unit 5, the middle box body is internally provided with a filtering unit 6, and the air injection unit 4 is installed right above the filtering unit 6; the surface of the lower fixing plate 14 is provided with a hole, so that dust can smoothly fall into the dust hopper 3 during dust cleaning, the centrifugal unit 5 is arranged on the upper surface of the upper fixing plate 13, and the centrifugal unit 5 is used for driving the filtering unit 6 to rotate. Impurity-containing gas enters the middle box body through the gas inlet 11 and reaches the purpose of impurity removal through the filtering unit 6, the filtered gas enters the upper box body through the middle box body and is discharged from the gas outlet 12, impurities in the gas fall into the ash bucket 3 firstly due to the influence of gravity, and impurities with high mass are adhered to the outer side of the filtering unit 6 along with the rising of the gas. During the deashing work, close air inlet 11 and gas outlet 12, be in the no air flow state in making casing 1, utilize 5 drive filter unit 6 rotations of centrifugation unit, when 6 rotational speeds of filter unit reach the predetermined value and tend to the stability, jet-propelled unit 4 utilizes pulse gas to carry out jet-propelled processing to filter unit 6, filter unit 6 has centrifugal action under the drive of centrifugation unit 5, utilize the combination of 5 and 4 effects of jet-propelled unit, improve the deashing efficiency, can drop partly dust under the effect of centrifugal force, reduce the pressure of pulse gas to filtering the sack.

As an embodiment of the present invention, the filtering unit 6 includes a spacer 61, a cage bush 62, a cage 63, a mounting ring 64, a cloth bag filter screen 65, a coupler 66 and a flange 67, wherein the spacer 61 is coaxially and fixedly connected with a hole formed in the upper fixing plate 13; a stepped hole is formed in the top end of the spacer sleeve 61, the cage shaft sleeve 62 is mounted in the stepped hole of the spacer sleeve 61, orientation blocks are symmetrically arranged on two sides of the cage shaft sleeve 62, the cage shaft sleeve 62 is rotatably connected with the spacer sleeve 61 through the orientation blocks, a counter bore is formed in the cage shaft sleeve 62, and the cage 63 is fixedly connected inside the counter bore; the bag filter 65 is sleeved outside the cage 63, and the top of the bag filter 65 is fixedly arranged on the cage shaft sleeve 62 through the flange 67 to filter impurities in the gas; the mounting ring 64 is rotatably connected to the top of the spacer 61, a limiting hole matched with the external shape of the cage shaft sleeve 62 is formed in the mounting ring 64, the cage shaft sleeve 62 is mounted in the limiting hole in the mounting ring 64, so that the cage shaft sleeve 62 and the mounting ring 64 rotate synchronously, the centrifugal unit 5 is arranged at the outer end of the mounting ring 64, the mounting ring 64 is driven by the centrifugal unit 5 to rotate, and the filtering unit 6 is driven by the rotation of the mounting ring 64 to rotate; the lower part of the filter unit 6 is connected with the lower fixing plate 14 through the coupler 66, so that the cage 63 is prevented from swinging greatly in the rotating process.

In one embodiment of the present invention, the centrifugal unit 5 includes a driving sprocket 51, a driving shaft 52, a driven sprocket 53, a chain 54, a tension pulley 55, a tension pulley shaft 56 and a centrifugal motor 57, the driving sprocket 51 is mounted above the upper fixing plate 13 through the driving shaft 52, and the driving shaft 52 is coaxially and fixedly connected with a hole formed in the upper fixing plate 13; the driven chain wheel 53 is arranged on the outer side of the mounting ring 64, and the driving chain wheel 51 is in power connection with the driven chain wheel 53 through the chain 54; the tensioning wheel 55 is mounted on the upper surface of the upper fixing plate 13 through the tensioning wheel shaft 56, and the tensioning wheel shaft 56 is coaxially and fixedly connected with the shaft hole of the upper fixing plate 13; the centrifugal motor 57 is in power connection with the driving chain wheel 51 through a bracket.

As an embodiment of the invention, two bosses are arranged on the inner side of the shell 1, the upper fixing plate 13 is mounted above the bosses on the shell 1, the upper fixing plate 13 is rotatably connected with the bosses on the shell 1, the inner gear ring 17 is arranged on the upper surface of the upper fixing plate 13, the rotating motor 15 is mounted on the inner side of the shell 1 through a motor support, the gear 16 is fixedly mounted on the rotating motor 15 and is meshed with the inner gear ring 17, when the filtering unit 6 needs to be replaced, the rotating motor 15 drives the upper fixing plate 13 to rotate through the meshing of the gear 16 and the gear ring 17, and when the position of the position right above the filtering unit 6 is staggered with that of the air injection unit 4, the filtering unit 6 can be directly and manually taken out, so that the filtering cloth bag is convenient to replace, and the replacement efficiency is improved; the lower fixing plate 14 is arranged above the lower boss of the shell 1, and the lower fixing plate 14 is rotatably connected with the lower boss; the upper fixing plate 13 is connected with the lower fixing plate 14 through a pipe shaft, so that the upper fixing plate 14 and the lower fixing plate 14 can rotate at the same angle.

In one embodiment of the present invention, the coupling 66 includes a first magnet 661, a second magnet 662 and a ball hinge 663, the first magnet 661 is installed below the filter unit 6, the second magnet 662 is installed above the ball hinge 663 and is mutually attracted to the first magnet 661, and the lower part of the ball hinge 663 is fixedly installed on the lower fixing plate 14, and the coupling 66 mainly functions to prevent the filter unit 6 from largely swinging when rotating. Magnet 661 and magnet 662 can realize the quick installation and dismantlement between filter screen and bottom plate 14, and ball hinge 663 guarantees filter unit 6 at the swing of rotation in the less scope to make filter unit 6 shake off the dust centrifugation in the rotation.

As an embodiment of the present invention, a sealing ring made of silica gel is disposed on the inner surface of the bottom end of the spacer 61 to prevent the impurity-containing gas from entering the upper box body without passing through the filter cloth bag.

As an embodiment of the present invention, the centrifugal unit 5 is provided with a plurality of sets, each set of centrifugal unit 5 controls one row or column of filter units 6, and the rotation directions of the adjacent rows or columns of filter units 6 are opposite. The dust adsorbed on the surface of the filter cloth bag net 65 is separated from the filter cloth bag net 65 along the tangential direction of the filter cloth bag net 65 under the action of centrifugal force, and the rotation directions of adjacent rows or columns of filter units 6 are controlled to be opposite in the invention, so that the dust can collide in the separation process and move towards the inner side of the shell 1, and the probability that the dust is adsorbed on the surface of the filter cloth bag net 65 again in the falling process is reduced to a certain extent. And the rotation directions of the adjacent row or column of filter units 6 are the same, the dust collides in the separation process, the dust is only under the action of gravity after the collision, and the longer the dust stays in the interval between the adjacent filter cloth bag nets 65, the poorer the ash removal effect is.

In one embodiment of the present invention, the top cover 2 includes a top cover housing 21, a fan blade shaft 22, a shaft bracket 23, and a fan blade 24, the top cover housing 21 is fixedly mounted above the casing 1, the fan blade shaft 22 is fixedly mounted in the top cover housing 21 through the shaft bracket 23, and the fan blade 24 is coaxially and rotatably connected to the fan blade shaft 22 through a shaft hole provided therein. In the process of replacing the filter unit 6, the filter unit 6 needs to be taken out of the middle box body, and after the upper fixing plate 13 rotates, the fan blades 24 right above the filter unit 6 are rotated to take out the filter unit 6.

When the dust accumulated on the surface of the filter cloth bag net 65 reaches a certain amount, the filtering efficiency is reduced, and the ash removal treatment needs to be performed on the filter cloth bag net 65. Before the ash removal action is started, the whole machine needs to be in a working stop state; starting the centrifugal motor 57, driving the filter unit 6 to rotate by the centrifugal motor 57 through the chain wheel and chain 54, and enabling dust to fall off the surface of the filter cloth bag net 65 under the action of centrifugal force of the filter unit 6; when the filtering unit 6 is driven by the centrifugal unit 5 to rotate at a constant speed, the air injection unit 4 is started to perform air injection treatment on the inside of the filtering unit 6, air sprayed by the air injection unit 4 enters the inside of the filtering unit 6 to perform air injection treatment on residual dust adsorbed on the surface of the filter cloth bag net 65, so that the purpose of dust falling is achieved, and the probability that the dust is attached to the surface of the filter cloth bag net 65 again in the falling process is reduced due to the fact that the rotating directions of the filtering units 6 in adjacent rows or columns are opposite.

After the dust remover works for a certain time, the filter cloth bag net 65 can be damaged on the surface or the filtering effect can not meet the discharge requirement, the filter cloth bag net 65 needs to be replaced, the rotating motor 15 is started, the filter unit 6 and the centrifugal unit 5 above the upper fixing plate 13 rotate along with the upper fixing plate 13, when the filter unit 6 is staggered with the air injection unit 4, the top cover fan blades 24 above the filter unit 6 are started, the filter unit 6 is manually taken out from the upper fixing plate 13, and the filter cloth bag net 65 is replaced.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A low-pressure pulse long-bag dust collector comprises a shell (1), a top cover (2) and an ash bucket (3), wherein an air inlet (11) is formed in the bottom of the shell (1), an air outlet (12) is formed in the top of the shell (1), the shell (1) is divided into an upper box body, a middle box body and a lower box body by an upper fixing plate (13) and a lower fixing plate (14), the upper fixing plate (13) and the lower fixing plate (14) are installed in the shell (1), an air injection unit (4) and a centrifugal unit (5) are arranged in the upper box body, a filtering unit (6) is installed in the middle box body, and the air injection unit (4) is installed right above the filtering unit (6); the surface of the lower fixing plate (14) is provided with holes, and the lower fixing plate is characterized in that: the centrifugal unit (5) is arranged on the upper surface of the upper fixing plate (13), and the centrifugal unit (5) is used for driving the filtering unit (6) to rotate.

2. The low-pressure pulse long bag dust collector of claim 1, wherein: the filtering unit (6) comprises a spacer bush (61), a cage shaft sleeve (62), a cage (63), a mounting ring (64), a cloth bag filtering net (65), a coupler (66) and a flange plate (67), and the spacer bush (61) is coaxially and fixedly connected with a hole formed in the upper fixing plate (13); a stepped hole is formed in the top end of the spacer sleeve (61), the cage bar shaft sleeve (62) is installed in the stepped hole of the spacer sleeve (61), azimuth blocks are symmetrically arranged at two sides of the cage bar shaft sleeve (62), a counter bore is formed in the cage bar shaft sleeve (62), and the cage bar (63) is fixedly connected to the inside of the counter bore; the cloth bag filter screen (65) is sleeved outside the cage frame (63), and the top of the cloth bag filter screen (65) is fixedly arranged on the cage frame shaft sleeve through the flange plate (67); the mounting ring (64) is rotatably connected to the top of the spacer sleeve (61), a limiting hole matched with the external shape of the cage bar shaft sleeve (62) is formed in the mounting ring (64), the cage bar shaft sleeve (62) is mounted in the limiting hole in the mounting ring (64), and a centrifugal unit (5) is arranged at the outer end of the mounting ring (64); the lower part of the filtering unit (6) is connected with the lower fixing plate (14) through the coupler (66).

3. The low-pressure pulse long bag dust collector of claim 2, wherein: the centrifugal unit (5) comprises a driving chain wheel (51), a driving shaft (52), a driven chain wheel (53), a chain (54), a tension wheel (55), a tension wheel shaft (56) and a centrifugal motor (57), the driving chain wheel (51) is installed above the upper fixing plate (13) through the driving shaft (52), and the driving shaft (52) is coaxially and fixedly connected with a hole formed in the upper fixing plate (13); the driven chain wheel (53) is arranged on the outer side of the mounting ring (64), and the driving chain wheel (51) is in power connection with the driven chain wheel (53) through the chain (54); the tensioning wheel (55) is mounted on the upper surface of the upper fixing plate (13) through the tensioning wheel shaft (56), and the tensioning wheel shaft (56) is coaxially and fixedly connected with the shaft hole of the upper fixing plate (13); the centrifugal motor (57) is in power connection with the driving chain wheel (51) through a bracket.

4. A low pressure pulse long bag dust collector according to claim 3, wherein: the inner side of the shell (1) is provided with two bosses, the upper fixing plate (13) is installed above the upper bosses on the shell (1), the upper fixing plate (13) is rotatably connected with the upper bosses on the shell (1), the upper surface of the upper fixing plate (13) is provided with the inner gear ring (17), the rotating motor (15) is installed on the inner side of the shell (1) through a motor support, and the gear (16) is fixedly installed on the rotating motor (15) and is meshed with the inner gear ring (17); the lower fixing plate (14) is arranged above the lower boss of the shell (1), and the lower fixing plate (14) is rotatably connected with the lower boss; the upper fixing plate (13) is connected with the lower fixing plate (14) through a pipe shaft.

5. The low-pressure pulse long bag dust collector of claim 4, wherein: the shaft coupling (66) comprises a magnet (661), a magnet (662) and a ball hinge (663), the magnet (661) is installed below the filtering unit (6), the magnet (662) is installed above the ball hinge (663) and is adsorbed together with the magnet (661), and the lower part of the ball hinge (663) is fixedly installed on the lower fixing plate (14).

6. A low pressure pulse long bag dust collector according to claim 3, wherein: the inner surface of the bottom end of the spacer sleeve (61) is provided with a sealing ring made of silica gel.

7. The low-pressure pulse long bag dust collector of claim 4, wherein: the centrifugal units (5) are provided with a plurality of groups, each group of the centrifugal units (5) controls the filtering units (6) in one row or one column, and the rotating directions of the filtering units (6) in the adjacent row or one column are opposite.

8. The low-pressure pulse long bag dust collector of claim 1, wherein: the top cover (2) comprises a top cover shell (21), a fan blade shaft (22), a shaft support (23) and fan blades (24), the top cover shell (21) is fixedly installed above the shell (1), the fan blade shaft (22) is fixedly installed in the top cover shell (21) through the shaft support (23), and the fan blades (24) are coaxially and rotatably connected with the fan blade shaft (22) through a shaft hole formed in the fan blade shaft.