KR101963322B1 - Dust gathering apparatus for grain drier - Google Patents

Abstract

In the present invention, contaminated air mixed with a foreign substance discharged from a grain dryer is collected while passing through a primary dust collector and a secondary dust collector in order to improve a turning force in a dust collecting process and prevent a deterioration of an air- Disclosed is a dust collecting apparatus for a grain dryer which improves the efficiency of dust collection so that foreign matter can be smoothly separated.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a dust collecting apparatus for a grain dryer,

The present invention relates to a dust collecting apparatus for separating and collecting foreign matter of polluted air discharged from a grain dryer through a blowing blower, the dust collecting apparatus having a cylindrical shape for increasing dust collecting efficiency through a cyclone effect, A dust collecting cylinder in which an air inlet is formed at a front surface of the dust collecting cylinder so as to allow contaminated air having foreign matter mixed therein to be introduced therein and a diffusion part for generating a swirling force in a circumferential direction while diffusing an inlet diameter in the dust collecting cylinder, And an exhaust box connected to the rear end of the dust collecting cylinder and connected to the upper end of the dust collecting cylinder to form an air outlet for discharging purified purified air while foreign matter is filtered. A discharge induction pipe having one end connected to the upper surface of the rear portion of the dust collecting cylinder to transfer the foreign matter filtered after the primary dust collecting together with the air; A centrifugal separator which is connected to the other end of the discharge induction pipe so as to communicate and is deflected to one side so as to provide a centrifugal force, a second purifying air which is vertically provided at the center of the centrifugal separator, A centrifugal separator and a centrifugal separator disposed in the bottom of the centrifugal separator and including a tube having a predetermined length and provided at a lower portion of the centrifugal separator and having an end gradually narrowed from the upper portion to the lower portion, And a secondary dust collector for collecting dust from the dust-collecting device.

Generally, cereals such as rice and barley which are harvested from the mountain are processed and distributed for edible purposes. Since it is too much moisture to be stored until processing, it is easily deformed. Therefore, it is necessary to dry the dried hot air forcibly, Grain dryers are widely used to dry them.

In order to prevent the impurities from being contained in the product, the grain dryer generally used for the above reasons is provided with a blower in general. However, since there is no device for collecting the separated impurities, only the impurities are separated from the product, And pollutants are not filtered and are radiated into the air as they are harmful to neighbors, resulting in disadvantages such as farm disputes, user respiratory disorders, and rural environmental problems.

In order to solve such problems, a dust collector capable of purifying the air was directly connected to a conventional grain dryer. However, conventionally, the grain dryer was installed separately from the grain dryer, and the polluted air radiated to be scattered to the outside was removed And the dust is removed by the centrifugal force while rotating the air.

However, in such a dust collector, it is difficult to exhibit a continuous dust collection effect due to the limit of the dust collection amount in a place where dust and dust are generated. In the dust collector provided in the past, the inlet and the outlet are positioned on a straight line, The flow of the swirling flow of the polluted air is short and the influence thereof is received only for a short time, so that it is difficult to expect efficient dust collection. Further, it is possible to separate large and heavy foreign matters, The filtration can not be effectively performed by the centrifugal force, and the purification effect can not be maximized.

On the other hand, in recent grain dryer, since the quality of grain is prioritized and converted to a low-temperature-to-air-flow system, a dehumidifying blower for discharging contaminated air containing foreign substances into the grain dryer is becoming larger. In general, the cyclone system is used as an inexpensive dust collector compared with the efficiency, but it is not applicable to a cyclone dust collector having a large size and large diameter ventilation fan.

In order to solve such a problem, a horizontal type cyclone system capable of applying a small size and large diameter ventilation blower was used (refer to FIGS. 1 and 2). This system is directly connected to the ventilation fan, It is a dust collecting method that separates foreign matters. However, the drying resistance is deteriorated during the drying of grains due to the occurrence of air flow resistance in the process of generating swirling force. In addition, when a foreign object is discharged through a foreign material discharge pipe and collected into a bag, not only foreign substances are discharged into the bag but also air is discharged to the inside of the bag and pressure is generated inside the bag. And the pressure in the main body of the dust collector increases the drying efficiency of the grain dryer. In addition, since the dust is discharged to the inlet of the bag, the efficiency of the dust collecting is reduced.

Korean Utility Model Registration No. 20-0465998 (dust collector for grain dryer)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide an air- And an object of the present invention is to provide a dust collecting apparatus for a grain dryer capable of improving efficiency.

The present invention also provides a dust collecting device for a grain dryer, which can solve the problem that the drying efficiency of the grain dryer is lowered and the dust is discharged to the inlet of the bag due to the pressure generated in the inside of the bag during the process of collecting the foreign matter separated from the air .

In order to solve the above-mentioned problems, the present invention provides a dust collecting apparatus for separating and collecting foreign matter of polluted air discharged from a grain dryer through a blowing blower, and having a cylindrical shape for increasing dust collecting efficiency through a cyclone effect A dust collecting cylinder connected to the duct of the grain dryer and connected to communicate with the duct of the grain dryer and having an air inlet formed at the front thereof so as to allow contaminated air mixed with the foreign matter to flow therein and a centrifugal force generated by diffusing an inlet diameter in the dust collecting cylinder, And an exhaust box connected to the rear upper end of the dust collecting cylinder to form an air outlet for discharging the purified air filtered while foreign matter is filtered, Wow; A discharge induction pipe having one end connected to the upper surface of the rear portion of the dust collecting cylinder to transfer the foreign matter filtered after the primary dust collecting together with the air; A centrifugal separator which is connected to the other end of the discharge induction pipe so as to communicate and is deflected to one side so as to provide a centrifugal force, a second purifying air which is vertically provided at the center of the centrifugal separator, A centrifugal separator and a centrifugal separator disposed in the bottom of the centrifugal separator and including a tube having a predetermined length and provided at a lower portion of the centrifugal separator and having an end gradually narrowed from the upper portion to the lower portion, The exhaust pipe is connected to one side of the exhaust box so that the second purified air formed after the second dust collection is discharged through the air outlet of the exhaust box, When the first purified air is exhausted, it is not subjected to resistance due to interference with the second purified air flowing through the exhaust pipe To the exhaust pipe and so as to face the portion to be connected to be in communication separation duct is installed characterized in that one so that the first purified air to the second purified air can be smoothly exhausted through a chimney effect and suction effect.

In addition, in the present invention, the discharge induction pipe includes an accelerator for accelerating the polluted air after the primary dust collection and rapidly injecting the polluted air into the secondary dust collector. The foreign matter contained in the polluted air of the grain dryer is supplied to the primary dust collector and the secondary dust collector The dust is collected through a car dust collector, and the polluted air discharged after the first dust collection through the accelerator is accelerated to be injected into the secondary dust collector, whereby resistance is generated in the process of forcibly turning the polluted air passing through the diffusion portion, And the drying efficiency of the grain dryer is lowered because the efficiency is lowered.

The diffusing portion may include a conical hub for diffusing the intake port diameter, a first turning vane attached to the outer circumferential surface of the hub at a predetermined interval in the circumferential direction to improve the turning force, And a second turning vane which is attached to the outer circumferential surface of the guide at a predetermined interval in a circumferential direction to generate a turning force so as to be radiated in a circumferential direction.

Further, in the present invention, the air outlet port is formed on the upper part of the exhaust box so as to smoothly discharge the first purified air through the chimney effect and the convection phenomenon, And the dust collecting elbow is detachably coupled so that the exhaust direction can be efficiently controlled.

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According to the present invention as described above, the contaminated air mixed with the foreign matter discharged from the grain dryer is collected while passing through the primary dust collector and the secondary dust collector sequentially, but the turning force is improved in the dust collecting process, The efficiency can be improved.

In addition, the effect of accelerating the polluted air introduced into the air inlet through the accelerator inside the discharge induction pipe to improve the turning force and the pressure inside the primary dust collector to lower the ventilation resistance of the ventilation fan, There is an advantage that the efficiency can be prevented from being lowered.

Also, there is an effect that foreign matter can be separated more smoothly while the polluted air maintains the swirl flow through the diffusion portion.

In addition, an air outlet is formed in the upper part of the exhaust box, so that the first purified air formed through the first dust collector and the second purified air formed through the second dust collector can be smoothly discharged through the chimney effect and the suction effect, It is possible to prevent the problem that the pressure inside the bag is increased due to no air being introduced into the bag during the process of collecting the foreign matter, thereby lowering the drying efficiency of the grain dryer and remarkably reducing the problem of discharging dust to the bag inlet It is effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional dust collecting apparatus for a grain dryer. FIG.
3 is a connection state diagram of a grain dryer and a dust collector for a grain dryer having improved dust collecting efficiency according to the present invention.
Figures 4a and 4b illustrate examples of a dust collector for a grain dryer in which the dust collection efficiency is improved according to an embodiment of the present invention.
5 is a schematic illustration of a primary dust collector for a grain dryer having improved dust collecting efficiency according to the present invention.
FIG. 6 is a schematic view for explaining a discharge induction pipe and an acceleration device provided therein according to an embodiment of the present invention; FIG.
7 is an exemplary view of a diffuser according to an embodiment of the present invention;
8 to 9 are schematic illustrations for explaining a secondary dust collector and a separation duct according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dust collector for a grain dryer having improved dust collecting efficiency according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention is characterized in that the swirling air flow of the mixed air mixed with the foreign matter discharged from the moisturizing blower of the grain dryer can be sufficiently performed and the blowing loss of the moisturizing blower can be minimized to improve the dust collecting efficiency.

In order to achieve the above-mentioned object, the present invention is characterized by including a primary dust collector 100, a discharge induction pipe 200, and a secondary dust collector 300.

FIG. 3 is a connection diagram of a grain dryer and a dust collector for a grain dryer having improved dust collecting efficiency according to the present invention. As shown in FIG. 3, the dust collector according to the present invention includes a blower 2 and the duct 3 so that the polluted air discharged from the grain dryer is primarily collected through the primary dust collector 100 and the purified air is discharged to the outside and the foreign matter is filtered through the discharge guide pipe 200 It is possible to efficiently separate the foreign matter in the polluted air by re-inputting it into the car dust collector 300 and collecting it secondarily.

In the case of the fine dust, since it is contained in the air and is not easily separated, it is required to perform a repeated dust collecting process. Therefore, The dust collection efficiency can be improved by increasing the time of staying inside the dust collector through the dust collector 100 and the secondary dust collector 300. [

FIG. 5 is a view showing an example of a primary dust collector 100 according to the present invention. The arrows shown in the drawing show the path of the contaminated air introduced through the air blowing fan 2.

The primary dust collector 100 includes a dust collecting cylinder 110, a diffuser 120 for diffusing an inlet diameter in the front of the dust collecting cylinder, and an exhaust box 130 connected to the dust collecting cylinder .

The dust collecting cylinder 110 is formed in a cylindrical shape so as to increase the dust collecting efficiency through the cyclone effect. The dust collecting cylinder 110 is connected to the duct of the grain dryer through a front surface thereof, (111) is formed.

Here, the air inlet 111 is formed in such a shape that the diameter gradually decreases from the dust collecting cylinder to the end, so that it is easily connected to the duct 3 for the inflow of polluted air, and the polluted air is diffused evenly into the inside And increasing the centrifugal force by inducing an increase in the number of revolutions through the diffuser by reducing the wind velocity of the inlet, which is suitable for separation of foreign matter, thereby improving the separation force at a short distance.

Referring to FIG. 7, the diffusion unit 120 includes a conical hub 121 and a hub 121. The hub 121 includes a hub 121, A plurality of first turning blades 122 provided on the outer circumferential surface, a guide 123 extending from a rear edge of the hub, and a plurality of second turning blades 124 provided on an outer circumferential surface of the guide .

The hub 121 is formed in a conical shape having a diameter smaller than the diameter of the dust collecting tube so as to diffuse the suction hole, and a part of the vertex of the cone protrudes outward through the air inlet 111, Is extended from the rear edge of the hub by a predetermined length along the longitudinal direction of the dust collecting cylinder to impart straightness to the air introduced through the air inlet as a cylindrical body.

The first swirl vane 122 diffuses the contaminated air coming from the grain dryer into the inner circumferential surface of the dust collecting cylinder 110 while radiating the air so that the contaminated air can form a swirling air flow. The second swirling vane 124 is also attached to the inner periphery of the dust collecting cylinder 110 by diffusing the contaminated air coming from the grain dryer into the inner circumferential surface of the dust collecting cylinder 110, Are attached to the outer circumferential surface of the base plate 123 at a predetermined interval with a predetermined angle.

In the present invention, the diffusing unit 120 has a cylindrical shape having a predetermined length in the rear so that the separated air is circulated and the separating force is increased in the circumferential direction of the separating cylinder as the air volume in the central portion is weak And the front portion is made of a conical hub for minimizing the friction of the contaminated air. Accordingly, the contaminated air having passed through the air inlet 111 is diffused by the conical hub 121 located at the center portion, and the air speed is reduced so that the first swirl vane 122 and the second swirl vane 122 124, so that a strong swirling force is generated. When passing through the guide 123, the straightness is secured. At the same time, foreign matter particles contained in the swirling airflow are separated from the airflow while being scattered toward the wall surface by the action of the centrifugal force And then introduced into the secondary dust collector 300 through the discharge induction pipe 200, and the purified first purified air is naturally introduced into the exhaust box 130.

The exhaust box 130 is connected to an upper portion of the rear end of the dust collecting cylinder 110 and has an air outlet 131 for discharging the purified air from which foreign matter is filtered.

The air outlet 131 is connected to the exhaust outlet 131 so that the first purified air can be discharged smoothly through a chimney effect and a convection phenomenon as the temperature difference is higher than the atmospheric temperature, As shown in FIG. Further, an air discharge pipe (not shown) having a predetermined length may be additionally provided at an end of the air discharge port 131 to further enhance the effect of the chimney. A dust collecting elbow (not shown) is detachably coupled to the upper end of the air discharge port, So that the exhaust direction can be controlled efficiently.

The discharge induction pipe 200 is connected to one side of the upper end of the rear end of the dust collecting cylinder so as to communicate with one end thereof, and the polluted air containing foreign matter is transferred after primary collection.

4A, 4B and 6, the discharge induction pipe is equipped with an accelerator 210 (for example, an accelerating speed air blower) for accelerating the contaminated air after the first dust collecting so as to be rapidly charged into the secondary dust collector .

The blowing energy of the blower 2 for the grain dryer can be gradually reduced by receiving the wind resistance while passing through the swirling vanes 122 and 124 and the separator plate 112 of the diffuser portion, .

The present invention is characterized in that foreign substances contained in the polluted air of the grain dryer are collected through the primary dust collector 100 and the secondary dust collector 300 and the polluted air discharged after the primary dust collection through the accelerator 210 is accelerated So that the drying performance of the grain dryer can be prevented from being reduced as much as possible by preventing the blowing energy from being lowered in the process of separating the foreign matter from the polluted air introduced from the grain dryer, So that the separating force of the foreign matter can be remarkably improved.

8 to 9, a secondary dust collector 300 according to the present invention includes a centrifugal separator 310, an exhaust pipe 320, a foreign matter discharge pipe 330, and a collecting sack 340 .

The centrifugal separator (310) is a cylindrical body connected to the other end of the discharge induction pipe (200) so that only the foreign substances in the contaminated air introduced through the discharge induction pipe are dropped to the foreign matter discharge pipe at the lower side, The end of the discharge induction pipe is connected to a position deflected to one side so as to provide centrifugal force to the contaminated air introduced through the discharge induction pipe.

The exhaust pipe 320 is vertically provided at the center of the centrifugal separator, and one end of the exhaust pipe 320 is connected to one side of the exhaust box 130 so as to be connected to the second exhaust pipe 320. The second exhaust pipe 320 discharges the second purified air, . The second purified air discharged to the inside of the exhaust box is discharged to the air outlet of the upper part of the exhaust box.

The foreign matter discharge pipe (330) is provided at a lower portion of the centrifugal separator and has a shape in which the end portion is gradually narrowed from the upper portion to the lower portion. The collecting sidewall (340) is provided below the foreign matter discharge pipe, And collects the foreign substances discharged through the exhaust pipe.

The reason why the foreign matter discharge pipe 330 is formed to be gradually narrowed toward the bottom is that the repulsive force that can not be continuously lowered by the foreign matter discharge pipe formed by the centrifugal force, The heavy foreign substances are crashed and put into the collecting sack 340. Only light air (second purified air) rises and is returned to the exhaust box through the exhaust pipe.

The foreign matter discharge pipe 330 and the collecting sack 340 are provided to facilitate collection of the accumulated foreign substances, so that no additional labor is consumed.

In the conventional horizontal type dust collector, as the length of the horizontal direction is secured, the time for separating the foreign matter from the polluted air becomes longer, so that the efficiency of dust collection can be increased. However, in general, the space for installing the horizontal type dust collector is about 1.7 to 2 m There is a limit of installation space inside and outside. Further, since the purified air filtered after the dust collection is to be discharged forward, sufficient space has to be secured also on the rear surface of the dust collector. In addition, even if the length of the horizontal direction is sufficiently secured, there may be a problem that the blowing energy of the blower decreases toward the rear end. In order to increase the blowing energy of the blower, simply replacing the existing blower with a blower having a higher horsepower, There arises a problem that the air can not be separated from the foreign matter in the dust collector but is discharged as it is.

In order to solve this problem, the vertical type dust collector discharges the purified air filtered after the dust collection, so that the length of the horizontal type dust collector may be relatively narrower than that of the horizontal type dust collector. In order to increase the collection amount, As the diameter of the dust collector increases, the height of the dust collector increases and the height of the dust collector increases. Further, in order to discharge the purified air to the outside, an exhaust pipe passing through the outer wall of the building must be installed and connected with a duct, so that the construction is troublesome and complicated.

The primary dust collector 100 and the secondary dust collector 300 are configured to be interlocked through the discharge induction pipe 200 to improve the dust collecting efficiency by increasing the time for collecting polluted air, The first purified air and the second purified air can be discharged together through the air discharge port of the primary dust collector. Therefore, it is necessary to secure a space for installation in the conventional horizontal type dust collector and vertical type dust collector The dust collection efficiency is deteriorated due to the limitation of the installation space and the conventional vertical dust collector can dispense with the work for constructing the exhaust pipe and the duct to discharge the purified air to the outside.

Next, a separate duct 132 for preventing mutual interference between the second purified air introduced through the exhaust pipe and the first purified air and enhancing the chimney effect and the suction effect is provided in the exhaust box 130 according to the present invention do.

The separation duct 132 is installed to face the exhaust pipe 320 so that the exhaust pipe 320 is connected to the exhaust box 130 and has an end directed toward the air outlet 131. The second purified air, Guides to rise naturally due to the phenomenon.

If the separation duct 132 is not provided, the first purified air being exhausted and the second purified air flowing into the exhaust box 130 through the exhaust pipe 320 may interfere with each other, do. If the exhaust gas is not smooth, the pressure inside the dust collecting cylinder 110 rises and the blowing energy of the blowing blower is reduced. Therefore, the dust collecting efficiency of the primary dust collector 100 is lowered and the pressure inside the exhaust pipe 320 rises. The centrifugal force in the centrifugal separator 310 of the secondary dust collector is lowered even if the polluted air is accelerated after the first dust collection through the first dust collector 210 and the dust collecting efficiency is lowered. Accordingly, as described above, the exhaust duct 132 is provided inside the exhaust box to prevent mutual interference between the first purified air and the second purified air.

Meanwhile, the exhaust box 130 according to the present invention may be rotatably coupled to the dust collecting cylinder 110.

A connection port 133 is formed on an outer circumferential surface of one side of the exhaust box 130 so as to be connected to the exhaust pipe 320. If it is assumed that the exhaust box 130 is fixedly coupled to the dust collection cylinder 110, In order to change the position of the dust collector 300, it is necessary to replace the exhaust pipe with a corresponding shape. However, when the exhaust box 130 is rotatably coupled to the dust collecting cylinder 110 as in the present invention, the exhaust box 130 is rotated according to the installation position of the secondary dust collector 300, The present invention is advantageous in that it can flexibly cope with the construction of the present invention or when changing the position of the primary or secondary dust collector.

According to the present invention as described above, the contaminated air mixed with the foreign matter discharged from the grain dryer is collected while passing through the primary dust collector and the secondary dust collector sequentially, but the turning force is improved in the dust collecting process, It is possible to improve the efficiency and to reduce the resistance of the ventilation resistance of the blower for blowing due to the increase of the turning force. Especially, the polluted air formed after the first dust collecting is quickly and smoothly introduced into the second dust collector By lowering the pressure inside the primary dust collector, it is possible to prevent the efficiency of the ventilation of the blowing blower from being lowered, thereby minimizing the drying efficiency of the grain dryer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those of ordinary skill in the art that various changes and modifications may be made without departing from the scope of the present invention.

1: Grain dryer 2: Blower blower
3: Duct
10: dust collector 11: inlet
12: Fans 13: Collection Stands
100: primary dust collector
110: dust collecting cylinder 111: air inlet
112: separator plate
120: diffusion part 121: hub
122: first turning wing 123: guide
124: 2nd turning wing
130: exhaust box 131: air outlet
132: separation duct 133:
200: discharge induction pipe 210: accelerator
300: secondary dust collector 310: centrifugal separator
320: exhaust pipe 330: foreign matter discharge pipe
340: Collection Saddle

Claims (5)

A dust collecting apparatus for separating and collecting foreign matter of polluted air discharged from a grain dryer through a blowing blower,
And a dust collecting cylinder having a cylindrical shape to increase the dust collecting efficiency through the cyclone effect and connected to communicate with the duct of the grain dryer and having an air inlet 111 formed at the front thereof so as to allow the contaminated air, A diffusion part 120 for generating a swirling force while diffusing a suction port in the dust collecting cylinder so as to radiate in a circumferential direction, and a diffusion part 120 connected to the upper part of the rear end of the dust collecting part, A primary dust collector 100 including an exhaust box 130 in which an air outlet 131 for discharging the first purified air is formed;
A discharge induction pipe (200) connected at one end to the upper surface of the rear portion of the dust collecting cylinder to transfer the foreign matter filtered after the primary dust collecting with the air;
A centrifugal separator (310) connected to the other end of the discharge induction pipe so as to communicate and deflected to one side so as to provide a centrifugal force, a centrifugal separator (320) vertically provided at the center of the centrifugal separator, 2, an exhaust pipe 320 for discharging the purified air, a foreign matter discharge pipe 330 formed by a pipe having a predetermined length provided at the lower part of the centrifugal separator and having an end gradually narrowed from the upper part to the lower part, And a secondary dust collector (300) including a collecting sack (340) provided at a lower portion of the secondary dust collector (300)
Wherein the exhaust pipe is connected to an end of the exhaust box so that the second purified air is discharged through the air outlet of the exhaust box,
A separate duct is installed in the exhaust box so as to face the exhaust pipe in such a manner as to be connected to the exhaust pipe so as not to be resisted by interference with the second purified air flowing through the exhaust pipe when the first purified air is exhausted, And the air and the second purified air can be exhausted smoothly through the chimney effect and the suction effect, thereby increasing the dust collecting efficiency.
2. The dust collecting apparatus according to claim 1, wherein the discharge induction pipe is provided with an accelerator for accelerating the polluted air after the first dust collecting,
The foreign matter contained in the polluted air of the grain dryer is collected through a primary dust collector and a secondary dust collector, and the polluted air discharged after the primary dust collection is accelerated through an accelerator to be introduced into a secondary dust collector, Wherein the dust collecting efficiency is improved by reducing the drying efficiency of the grain dryer due to a decrease in the efficiency of blowing of the blower for blowing due to the occurrence of a resistance in the course of forcible turning.
[2] The apparatus according to claim 1, wherein the diffusing portion comprises: a conical hub for diffusing an intake port; a first turning vane attached to an outer circumferential surface of the hub at a predetermined interval in a circumferential direction to improve a turning force; And a second swinging blade attached to the outer circumferential surface of the guide at a predetermined interval in a circumferential direction to generate a swirling force so as to be radiated in a circumferential direction. Dust collector for grain dryer with increased efficiency.
The air conditioner of claim 1, wherein the air outlet port is formed on an upper part of the exhaust box to smoothly discharge the first purified air through the chimney effect and the convection phenomenon,
And a dust collecting elbow rotatable along a horizontal direction is detachably coupled to an upper end of the air outlet so that the exhaust direction can be efficiently controlled.
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