KR102538456B1 - Dust collecting system including aero guide and venturi structure - Google Patents

Abstract

A dust collection system according to an embodiment of the present invention comprises: a cyclone unit that performs a primary purification process for internally introduced air using cyclone rotation and vortex rotation; a filtering unit that filters residual dust remaining in the cyclone unit and moving upward to perform a secondary purification process, and includes a plurality of bag filters; and an air discharge unit provided at the upper portion of the filtering unit. The cyclone unit includes: a cyclone rotating unit that induces cyclonic rotation of the internally introduced air; a cyclone unit casing which surrounds the cyclone rotating unit and in which the width of a lower portion is less than the width of an upper portion; and aero guides provided between the cyclone rotating unit and the cyclone unit casing and connected to the cyclone rotating unit and the cyclone unit casing, wherein the aero guides are spaced apart from each other. The air discharge unit includes: an air outlet; and venturi structures connected to the air outlet, wherein the bag filters are disposed below the venturi structures. Each of the venturi structures includes: a ring unit having a ring shape surrounding an upper portion of a first vent hole; an inner wall unit provided at the inner lower portion of the ring unit and having a streamlined structure; and an outer wall unit connected to the lower surface of the ring unit and spaced apart from the inner wall unit with a third vent hole interposed therebetween, wherein the width of the upper portion of the third vent hole is greater than the width of the lower portion thereof, the middle portion and the lower portion of the first vent hole are surrounded by the inner wall unit, and the width of the upper portion of the first vent hole may be less than the width of the lower portion of the first vent hole. Dust collection efficiency can be enhanced.

Description

Dust collection system including aero guide and venturi system {DUST COLLECTING SYSTEM INCLUDING AERO GUIDE AND VENTURI STRUCTURE}

The present invention relates to a dust collection system, and more particularly, to a dust collection system including an air guide and a venturi system.

BACKGROUND OF THE INVENTION Gas discharged from factories or power plants contains many harmful substances or fine dust. The dust collecting system is a device for removing harmful substances such as fine dust contained in exhaust gas. A conventional dust collection system can remove harmful substances such as fine dust from air introduced through an air inlet by a cyclone method. In general, dust and the like fall and air is moved upward and introduced into the filter. The filter traps residual dust secondarily. The secondary purified air may be discharged through the air outlet.

Existing dust collection systems have problems in that they cannot filter complex dust or have relatively low dust collection efficiency.

The present invention has been proposed to solve the above-described technical problem, an object of the present invention is to provide a dust collection system that improves dust collection efficiency.

A dust collection system according to an embodiment of the present invention includes a cyclone unit for firstly purifying air introduced into the inside by using cyclone rotation and vortex rotation; a filtering unit including a plurality of bag filters for secondary purification by filtering residual dust remaining in the cyclone unit and moving upward; and an air discharge unit provided above the filtering unit, wherein the cyclone unit includes: a cyclone rotation unit for inducing cyclone rotation of the air introduced into the inside; a cyclone unit casing surrounding the cyclone rotation unit and having a lower portion narrower than an upper portion; and air guides provided between the cyclone rotating part and the cyclone unit casing and connected to the cyclone rotating part and the cyclone unit casing, the air guides spaced apart from each other, and the air discharge unit comprising: an air outlet ; and venturi structures connected to the air discharge port, wherein the bag filters are disposed below the venturi structures, and each of the venturi structures includes: a ring portion having a ring shape surrounding an upper portion of the first vent hole; an inner wall portion provided at an inner lower portion of the ring portion and having a streamlined structure; And an outer wall portion connected to the lower surface of the ring portion and spaced apart with the inner wall portion and the third vent hole therebetween, wherein the width of the upper portion of the third vent hole is greater than the width of the lower portion, and of the first vent hole A middle portion and a lower portion may be surrounded by the inner wall portion, and a width of an upper portion of the first vent hole may be smaller than a width of a lower portion of the first vent hole.

The dust collection system according to the embodiment of the present invention may exhibit improved dust collection efficiency and dust removal efficiency. The compressed air consumption of the dust collection system is reduced, and an improved energy saving rate can be displayed. According to embodiments, the dust collection system can be miniaturized and a filtering area can be secured.

1 is a cross-sectional view showing the structure of a cyclone dust collection system according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating rotation of the cyclone and flow of air in the cyclone dust collecting system of FIG. 1 .
FIG. 3A is a plan view of a cyclone unit casing, a cyclone rotating part, and an air guide shown in FIG. 1 .
3B is a perspective view of the inside of the cyclone unit casing for explaining the cyclone unit casing, the cyclone rotating part, and the air guide shown in FIG. 1;
4 is a view for explaining a pleated bag filter according to embodiments.
FIG. 5A is a cross-sectional view for explaining the connection relationship between the venturi structure shown in FIG. 1, the air pipe, and the air outlet.
5B is a perspective view for explaining a connection relationship between a venturi structure and an air pipe.
5C is a view for explaining a venturi structure.
5D is a diagram for explaining the flow of air in the venturi structure.

Hereinafter, embodiments of the present invention will be described clearly and in detail to the extent that a person skilled in the art can easily practice the present invention.

1 is a cross-sectional view showing the structure of a cyclone dust collection system according to an embodiment of the present invention.

Referring to FIG. 1 , the cyclone dust collection system 100 can purify dust or harmful gases, improve purification efficiency compared to existing dust collection systems, and reduce maintenance costs.

The cyclone dust collection system 100 may include a cyclone unit 110, a dust discharge unit 150, a filtering unit 160, and an air discharge unit 180. The cyclone unit 110, the dust discharge unit 150, the filtering unit 160, and the air discharge unit 180 may be detachably flange-coupled to each other. For example, the cyclone unit 110 and the filtering unit 160 face each other with the first flange 122 on the side of the cyclone unit 110 and the second flange 161 on the side of the filtering unit 160 facing each other. And by fastening bolts to the second flanges 122 and 161, the cyclone unit 110 and the filtering unit 160 can be coupled, and can be disassembled in the opposite way. Here, the cyclone unit 110 and the filtering unit 160 are not necessarily flange-coupled, and may be configured as one body without flange coupling. Similarly, the filtering unit 160 and the air discharge unit 180, and the cyclone unit 110 and the dust discharge unit 150 may also be flanged or integrally configured.

In this way, when the cyclone unit 110, the dust discharge unit 150, the filtering unit 160, and the air discharge unit 180 are mutually detachably flange-coupled, the corresponding units 110, 150, 160, and 180 It has the advantage of being easy to transport or maintain. In particular, there is an advantage in that cleaning or replacement of the filter module 170 provided in the filtering unit 160 can be very easy.

FIG. 2 is a cross-sectional view illustrating rotation of the cyclone and flow of air in the cyclone dust collecting system of FIG. 1 . In FIG. 2 , dotted lines and arrows indicate air flow.

Referring to FIGS. 1 and 2 , the cyclone unit 110 may include a hopper part 120 , a cyclone rotating part 130 , and an air guide 125 . An air inlet 111 is provided in the cyclone unit casing 121 forming the exterior of the cyclone unit 110 . External air may be introduced into the cyclone unit 110 through the air inlet 111 by using the suction force of the blowing fan 190 . The cyclone unit 110 induces dust or harmful gas to the inside through the air inlet 111, and then primarily purifies the dust using cyclone rotatory power and vortex. In FIG. 2 , black dotted lines indicate the flow and direction of air introduced through the air inlet 111 .

The cyclone unit casing 121 may form the appearance of the cyclone unit 110 . The upper part of the cyclone unit casing 121 may have a larger width than the lower part. An upper portion of the cyclone unit casing 121 may have a uniform width, and a lower portion of the cyclone unit casing 121 may have a tapered structure. For example, the lower portion of the cyclone unit casing 121 may become narrower toward the bottom. An upper portion of the cyclone unit casing 121 may be coupled with the filtering unit 160 and a lower portion may be coupled with the dust discharge unit 150 . Since the cyclone unit casing 121 has a structure in which the cross-sectional area is narrowed while the lower part goes down, the rotational force of air can be increased and the air flow can be smoothed. The hopper part 120 may be provided at the lower part of the cyclone unit casing 121, and the cyclone rotating part 130 may be provided at the upper part.

The hopper unit 120 may have a tapered structure in a truncated cone shape with a narrow cross-section as it goes down. When the hopper part 120 has a tapered structure, it is possible to maximize the rotational force of the air and increase dust collection efficiency by generating a vortex of the air passing through the cyclone rotating part 130 .

The cyclone rotation unit 130 may be disposed above the hopper unit 120 . The cyclone rotating part 130 serves to induce air rotation as indicated by the black arrow in FIG. 2 . The cyclone rotating part 130 maintains the rotational force of the air injected through the air inlet 111 and directs the air flow outward.

The cyclone rotating part 130 may include an upper inclined part 131 inclined in a truncated cone shape and a lower vertical part 132 formed in a cylindrical shape and having a rectangular cross section. The lower vertical portion 132 may be connected to the lower portion of the upper inclined portion 131 .

Referring continuously to FIGS. 1 and 2 , the dust discharge unit 150 may include a dust box 151 and a dust outlet 152 . Dust precipitated downward through the cyclone rotation and vortex rotation of the mobile cyclone rotating unit 130 is collected in the dust box 151. Dust collected in the dust box 151 may be discharged through the dust outlet 152 .

The filtering unit 160 is detachably coupled to the upper part of the cyclone unit 110, and performs secondary purification by filtering dust or residual gas remaining in the air moving upward in the cyclone unit 110. The filtering unit 160 may include a filtering unit casing 163 and a filter module 170 provided in the filtering unit casing 163 to filter residual dust.

The filtering unit casing 163 forms the exterior of the filtering unit 160 . The filtering unit casing 163 may provide a place for filtering residual dust remaining in the cyclone unit 110 and moving upward. As described above, the second flange 161 is provided at the lower end of the filtering unit casing 163 to be detachable from the cyclone unit 160 . A lug (not shown) for handling of the filtering unit casing 163 may be coupled to a side of the filtering unit casing 163 .

The filter module 170 is provided in the filtering unit casing 163 and serves to substantially filter residual dust remaining in the cyclone unit 110 and moving upward. The air secondarily purified through the filter module 170 may be discharged through the air discharge unit 180 . The filter module 170 may include a plurality of bag filters 171 . Each of the bag filters may be detachable from the filter fixing part 164 provided on the top of the filtering unit casing 163 .

A means for fixing the plurality of bag filters 171 is provided in the filter fixing part 164 . For example, the filter fixing part 164 may be provided with a means capable of placing the bag filters 171 on top or fastening them in a bolt-screw coupling method. Meanwhile, filter holes 165 through which air rising from the center of each of the bag filters 171 can escape to the air discharge unit 180 may be provided in the filter fixing part 164 .

Residual dust may pass through the plurality of bag filters 171 while passing through the filter module 170 . Residual dust may be purified secondarily while passing through the plurality of bag filters 171 . The plurality of bag filters 171 maximize the contact area of residual dust so that as much dust as possible can be adsorbed, thereby improving purification efficiency. Each of the bag filters 171 will be described in more detail with reference to FIG. 4 .

The air discharge unit 180 may be detachably coupled to or integrally coupled to the top of the filtering unit 160 . Air purified by the filter module 170 may flow into the air discharge unit 180 through the filter hole 165 . The air discharge unit 180 may include a venturi structure 18 , a discharge unit casing 183 , a discharge unit cover 184 , an air pipe 186 , and an air outlet 185 . Air in the discharge unit casing 183 may be discharged to the outside through the venturi structure 18, the air pipe 186, the air outlet 185, and the discharge pipe 192 due to the suction force of the blowing fan 190. .

The blowing fan 190 is a device that provides a suction force by applying energy to air through the rotational motion of an impeller. In the blowing fan 190, a fan having a pressure ratio between a suction port and a discharge port of less than 1:1 is referred to as a Bopong fan, and a blower having a pressure ratio of 1.1 or more and less than 2.0 is referred to as a blower. The blowing fan 190 may be a V-BELT driven type or a direct driven type-with coupling depending on a driving method. In addition, depending on the suction method, a single suction type and a double suction type may be used.

The blowing fan 190 may generate a suction force by the rotational motion of the impeller, and introduce external air into the cyclone unit 110 through the air inlet 111 . In addition, the blowing fan 190 causes air to rise in the cyclone unit 110 and passes through the filter module 170 of the filtering unit 160 . The blowing fan 190 discharges the air introduced into the air discharge unit 180 to the outside.

The cyclone dust collection system 100 according to an embodiment of the present invention can perform a primary purification process by the cyclone rotational force of the cyclone rotation unit 130 and the vortex rotational force of the hopper unit 120. In addition, the cyclone dust collecting system 100 may perform a second purification process in the filtering unit 160 including the filter module 180 . The cyclone dust collection system 100 of the present invention can increase the purification process efficiency by discharging air that has been purified twice. According to the present invention, it is possible to adjust the cyclone rotation time and increase the optimum dust collection efficiency with minimum power. In addition, the cyclone dust collecting system 100 is not only advantageous in reducing dust or harmful gases, but also can treat odors and is easy to maintain. In addition, since the structure is erected in the height direction, the installation area can be narrowed.

FIG. 3A is a plan view of a cyclone unit casing, a cyclone rotating part, and an air guide shown in FIG. 1 . FIG. 3B is a plan view of the cyclone unit casing, the cyclone rotating part, and the air guide shown in FIG. 1 .

Referring to FIGS. 3A and 3B , air guides 125 may be provided on an upper inner wall of the cyclone unit casing 121 . As shown in FIG. 3A , the aero guides 125 may be disposed surrounding the lower vertical portion 132 in a plan view. The aero guides 125 are provided between the lower vertical part 132 of the cyclone rotating part 130 and the cyclone unit casing 121, and are connected to the lower vertical part 132 and the cyclone unit casing 121. can The air guide 125 may be integrally formed with the cyclone unit casing 121, but is not limited thereto. The air guides 125 may be spaced apart from each other so that a gap space may be provided between the air guides 125 . The gap space between the air guides 125 may guide air to form a downward airflow. Since the air guide 125 is formed, downward air flow can be formed well. Cyclone rotational force and vortex of air can be better formed by the downward air flow.

Aero guides 125 may include metal such as iron or stainless steel. The aero guides 125 may include the same material as the cyclone unit casing, but are not limited thereto. Alternatively, the aero guides 125 may include plastic.

4 is a view for explaining a pleated bag filter according to embodiments.

Referring to FIG. 4 , the bag filter 171 may be a pleated bag filter such as an EpiT pleated bag. For example, the bag filter 171 may have pleats. The pleats of the bag filter 171 may have a long axis parallel to the vertical direction and may be flexible. The dedusting process of the bag filter 171 may be performed by unfolding the pleats of the bag filter 171 by air pulsing to desorb dust attached to the pleats. The pulsing process may be performed under pulsing pressure.

Since the dedusting process of the bag filter 171 is performed by unfolding wrinkles due to a relatively low pressure, re-scattering is minimized and dust collection efficiency can be improved. In addition, the shock applied to the bag filter 171 in the dedusting process is alleviated, and the life of the bag filter 171 can be improved.

According to embodiments, the residual pressure of the pleated bag filter 171 is maintained relatively constant even if the exhaustion cycle increases, but the residual pressure loss of the round bag may increase as the exhaustion cycle increases. The pleated bag filter 171 may have a low residual differential pressure due to high dust removal efficiency.

According to embodiments, the exhaustion interval of the pleated bag filter 171 may be longer than that of the circular filter under the same cycle condition. The overall dust collection efficiency of the pleated bag filter 171 may be higher than that of the circular bag. The pleated bag filter 171 has higher dust collection efficiency than round bags for dust with particle diameters of 0.3 μm, 1 μm, and 2.5 μm.

FIG. 5A is a cross-sectional view for explaining the connection relationship between the venturi structure shown in FIG. 1, the air pipe, and the air outlet. 5B is a perspective view for explaining a connection relationship between a venturi structure and an air pipe.

Referring to FIGS. 5A and 5B , a plurality of venturi structures 18 may be spaced apart from each other within a discharge unit casing 183 from a plan view. Venturi structures 18 may be arranged in rows. Columns formed by the venturi structures 18 may be spaced apart from each other in a row direction.

The venturi structures 18 may be connected to the air outlet 185 through a plurality of air pipes 186 . Each of the air pipes 186 may be spatially connected to the venturi structures 18 forming one row. Hereinafter, for simplicity of description, the venturi structures 18 and the air pipe 186 connected thereto forming one row will be described.

The air pipe 186 may include first air pipes 186A and second air pipes 186B. Each of the first air pipes 186A may extend in a direction parallel to the row direction when viewed from a plan view. The second air pipes 186B are provided between the first air pipes 186A and the venturi structures 18 and may be connected to the second air pipes 186B and the venturi structures 18 . Some of the air may move through the air outlet. Air may be supplied to the venturi structures 18 through the air outlet, the first air pipes 186A, and the second air pipes 186B. Hereinafter, any one of the venturi structures 18 will be described in more detail.

5C is a view for explaining a venturi structure. 5D is a diagram for explaining the flow of air in the venturi structure.

5C and 5D, the venturi structure 18 includes a ring portion 1801, an inner wall portion 1802, and an outer wall portion 1803, and includes a first vent hole 1891 and a second vent hole. 1892, and a third vent hole 1893.

The ring portion 1801 of the venturi structure 18 may have a ring shape or a ring shape in plan view. The ring portion 1801 of the venturi structure 18 may correspond to an upper portion of the venturi structure 18 . An upper portion of the first vent hole 1891 may pass through the ring portion 1801 of the venturi structure 18 . An upper portion of the first vent hole 1891 may have a relatively narrow diameter. A portion of the ring portion 1801 of the venturi structure 18 adjacent to the first vent hole 1891 (hereinafter, the inside of the ring portion 1801) may have a streamlined shape that is recessed downward.

The inner wall portion 1802 of the venturi structure 18 is provided below the inner side of the ring portion 1801, and may be spaced apart from the ring portion 1801. The inner wall portion 1802 of the venturi structure 18 may have a streamlined structure and may have a tapered shape. The middle and lower portions of the first vent hole 1891 may be surrounded by the inner wall portion 1802 of the venturi structure 18 . An upper diameter of the first vent hole 1891 may be smaller than a lower diameter.

A second vent hole 1892 may be provided between the hook portion 1801 and the inner wall portion 1802 of the venturi structure 18 and may be connected to the first vent hole 1891 . A width of the second vent hole 1892 may be smaller than that of the first vent hole 1891 . In this case, the width of the first vent hole 1891 may be measured in a horizontal direction, and the width of the second vent hole 1892 may be measured in a vertical direction.

The outer wall portion 1803 of the venturi structure 18 is connected to the lower surface of the ring portion 1801 and may be horizontally spaced apart with the inner wall portion 1802 and the third vent hole 1893 interposed therebetween. Accordingly, a third vent hole 1893 may be provided between the ring portion 1801 and the inner wall portion 1802 . The third vent hole 1893 may be connected to the first vent hole 1891 through the second vent hole. An upper width of the third vent hole 1893 may be greater than a lower width. The width of the third vent hole 1893 may be the distance between the inner wall portion 1802 and the outer wall portion 1803 facing each other.

The venturi structure 18 may further include a bottom portion 1804, and the bottom portion 1804 is provided between the lower end of the inner wall portion 1802 and the lower portion of the outer wall portion 1803, so that the inner wall portion 1802 ) and the outer wall portion 1803.

The second air pipe 186B may be connected to the outer wall portion 1803 of the venturi structure 18 . For example, the second air pipe 186B may be connected to a lower portion of the outer wall portion 1803 . Accordingly, the hole of the second air pipe 186B may be spatially connected to the third vent hole 1893 of the venturi structure 18 . For example, the outer wall portion 1803 of the venturi structure 18 and the second air pipe 186B may form an integral structure. In this case, an improved exhaustion effect can be obtained with a smaller amount of air.

Air can move as indicated by the red dotted lines and arrows in FIG. 5D. Air may be introduced into the lower part of the third vent hole 1893 through the second air pipe 186B. Since the width of the upper part of the third vent hole 1893 is greater than the width of the lower part of the third vent hole 1893, the air density at the lower part of the third vent hole 1893 is higher than the upper part of the third vent hole 1893. can be greater than the air density at Air may move from the lower part of the third vent hole 1893 to the upper part according to Bernoulli's principle. Thereafter, air may escape into the first vent hole 1891 through the second vent hole 1892 . At this time, the air may rapidly flow downward along the streamlined inner surface of the inner wall portion 1802 within the first vent hole 1891 due to the Coanda effect. Accordingly, air pressure above the first vent hole 1891 may be reduced. Specifically, the upper part of the first vent hole 1891 may be converted into a vacuum state or a state similar to a vacuum state. Due to this, the air above the venturi structure 18 is guided into the first vent hole 1891, and the flow of air passing through the first vent hole 1891 can be strengthened. For example, when air above the venturi structure 18 flows into the first vent hole 1891, the amount of air passing through the first vent hole 1891 may be greater than the initial amount of air. The initial amount of air may correspond to the amount of air in the first vent hole 1891 before air is injected through the air pipe 186 . When the air above the venturi structure 18 flows into the first vent hole 1891, the amount of air passing through the first vent hole 1891 may increase by about 15 to 20 times the initial amount of air. At this time, since the air is compressed at the top of the first vent hole 1891 and moves downward, the air pressure in the first vent hole 1891 may increase. Accordingly, the speed of air passing through the first vent hole 1891 may be increased. This may be similar to the principle of a 'bladeless fan'. The compressed air may pass through the first vent hole 1891 and be transferred to corresponding bag filters 171 of FIGS. 1 and 2 . Compressed air can have high pressures and high velocities.

Referring back to FIGS. 1 and 2 , a plurality of bag filters 171 may be respectively provided under the plurality of venturi structures 18 . Air passing through the first vent hole 1891 of the venturi structures 18 may be delivered to the bag filters 171 with a relatively strong pressure. The bag filters 171 are pulsed by the air, and dust adhering to the bag filters 171 may be dedusted by the pulsing. According to embodiments, the venturi structure 18 has such a structure, so that dust collection efficiency of the dust collection system 100 can be increased. For example, in the case of the prior art, only compressed air was pulsed, and thus there was a limitation. According to the present invention, since the air in the venturi structure 18 is moved using not only the force of compressed air, but also the natural force of air generated by the difference in air pressure, the dust collection system 100 can improve its dust removal capability. . In addition, since the amount of compressed air used is reduced, convenience in maintenance of the dust collecting system 100 may be increased.

The venturi structure 18 may include metal (eg, iron) or rigid plastic. The venturi structure 18 has rigidity and may not be damaged by high-pressure air.

Existing dust collection facilities may not be able to filter complex dust and have a problem of having a dust collection efficiency of 94% or less.

The dust collecting system 100 according to embodiments may filter complex dust and perform a pre-processing function of complex dust. The dust collection system 100 according to the embodiments may exhibit a dust collection efficiency of 96% or more, specifically 98% or more. The dust collecting system 100 according to the embodiments may exhibit about 20% improved energy saving rate and 34% improved dust removal efficiency. The dust collection system 100 according to the embodiments may exhibit the same level of dust collection effect as the conventional 100% volume dust collection facility with a 70% volume. Accordingly, the dust collection system 100 can be miniaturized and a filtration area can be secured. The dust collection system 100 according to the embodiments can reduce maintenance costs by 25% or more. For example, the lifespan of the bag filters 171 can be improved up to 5 times, and air consumption can be reduced by 25% or more.

According to embodiments, since the venturi structure 18 is used, dust removal efficiency of the dust collecting system 100 may be improved without being restricted by air supply conditions. According to the dust collection system 100, effects such as reduction in differential pressure, reduction in clogging probability, improvement of dust collection equipment through securing sufficient exhaust air volume, and reduction in compressed air consumption may occur.

The foregoing are specific embodiments for carrying out the present invention. In addition to the above-described embodiments, the present invention will also include embodiments that can be simply or easily changed in design. In addition, the present invention will also include techniques that can be easily modified and practiced using the embodiments. Therefore, the scope of the present invention should not be limited to the above-described embodiments and should not be defined, and should be defined by those equivalent to the claims of this invention as well as the claims to be described later.

Claims (5)

A cyclone unit that firstly purifies the air introduced into the inside by using cyclone rotation and vortex rotation;
a filtering unit for filtering residual dust remaining in the cyclone unit and moving upward, and including a plurality of bag filters and a filtering unit casing; and
An air discharge unit provided above the filtering unit,
The cyclone unit is:
a cyclone rotation unit for inducing cyclone rotation of the air introduced into the interior;
a cyclone unit casing surrounding the cyclone rotation unit and having a lower portion narrower than an upper portion; and
air guides provided between the cyclone rotating part and the cyclone unit casing and connected to the cyclone rotating part and the cyclone unit casing, the air guides being spaced apart from each other;
The air evacuation unit:
air outlet;
an air pipe connected to the air outlet; and
Includes venturi structures connected to the air outlet through the air pipe;
The bag filters are disposed under the venturi structures,
Each of the venturi structures:
a ring portion having a ring shape surrounding an upper portion of the first vent hole;
an inner wall portion provided on an inner lower portion of the ring portion and having a tapered streamlined structure;
an outer wall portion connected to the lower surface of the ring portion and spaced apart from the inner wall portion with a third vent hole therebetween; and
A bottom portion provided between the lower end of the inner wall portion and the lower end of the outer wall portion and connected to the inner wall portion and the outer wall portion,
The air pipe is connected to the lower portion of the outer wall of the venturi structure and does not penetrate the inner wall,
The hole of the air pipe is spatially connected to the third vent hole,
The width of the upper part of the third vent hole is greater than the width of the lower part,
An outer surface of the inner wall portion is exposed to the third vent hole,
The inner surface of the inner wall portion is exposed to the first vent hole and is opposed to the outer surface,
The middle and lower portions of the first vent hole are surrounded by the inner wall portion,
The width of the upper part of the first vent hole is smaller than the width of the lower part of the first vent hole and the width of the middle part of the first vent hole,
The width of the middle part of the first vent hole is smaller than the width of the lower part of the first vent hole,
The cyclone unit casing is provided below the filtering unit casing,
The cyclone rotating part is provided at a level lower than the bag filters,
The uppermost surfaces of the air guides are provided at a level lower than the lowermost portions of the bag filters, and the dust collection system is spaced apart from the bag filters.

According to claim 1,
The bag filters are dust collection system comprising pleated bag filters.
According to claim 1,
A second vent hole is provided between the ring part and the inner wall part, and the third vent hole is connected to the first vent hole through the second vent hole.
According to claim 3,
The air guide is integrally formed with the cyclone unit casing.
According to claim 1,
The air guides are disposed surrounding the cyclone rotating part in a plan view, and a gap space is provided between the air guides.

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