CN112771316A

CN112771316A - Local exhaust device

Info

Publication number: CN112771316A
Application number: CN201980062180.7A
Authority: CN
Inventors: 金知河
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-18
Filing date: 2019-03-08
Publication date: 2021-05-07
Also published as: KR102146057B1; KR20200009374A; WO2020017726A1

Abstract

Disclosed is a local exhaust apparatus for sucking contaminated air and exhausting the same to the outside. The disclosed local exhaust apparatus includes: a drive section; a swirler which is provided near an air inlet of the exhaust pipe and is rotated by the driving portion to generate a vortex; and a case accommodating the cyclone therein. An opening is formed at a portion corresponding to the vortex discharge end of the tank at a front face of the tank facing the vortex discharge end of the cyclone, and at least one auxiliary exhaust port for exhausting air inside the tank to the outside is formed at the other wall of the tank. A space is formed between the front wall of the tank where the opening is formed and the vortex flow discharge end portion of the cyclone in the rotation center axis direction of the cyclone, and a vortex flow generated by the cyclone and passing through the vortex flow discharge end portion flows into the tank through the space.

Description

Local exhaust device

Technical Field

The present invention relates to a local exhaust device for sucking contaminated air and discharging the contaminated air to the outside, and more particularly, to a local exhaust device capable of improving exhaust efficiency by a stable exhaust airflow.

Background

Generally, an exhaust apparatus is installed in a kitchen of a factory, a home, or a restaurant, which generates pollutants such as malodor, harmful gas, soot, dust, etc., and is used to suck air including such pollutants and discharge it to the outside.

In the conventional exhaust apparatus having such an application, as the distance between the pollution source and the exhaust apparatus increases, the exhaust efficiency when the polluted air is sucked and discharged sharply decreases, and in the case where the pollution source is located in an open and spacious space, the exhaust efficiency of the exhaust apparatus also decreases.

Therefore, in order to improve the exhaust efficiency, it is preferable to dispose the exhaust device as close as possible to the pollution source and block the pollution source from the surrounding space.

However, in an actual work place, there often occur a case where it is difficult to dispose the exhaust device in the vicinity of the pollution source and a case where it is difficult to block the pollution source from the surrounding space, and in such a case, there is a case where satisfactory exhaust efficiency cannot be obtained from the existing exhaust device. In order to solve such a problem, the intake amount of the polluted air is increased by using an excessively large amount of the exhaust fan at present. However, in this case, there are disadvantages in that noise is deteriorated, expensive setup and driving costs result in a reduction in economy, and satisfactory exhaust efficiency is still not obtained.

In order to compensate for such a drawback of the conventional exhaust apparatus, a partial exhaust apparatus has been developed to improve exhaust efficiency by using a cyclone (swirler) that forms a vortex, and korean registered patent No. 10-0873522 discloses an example of the partial exhaust apparatus using a cyclone.

Such prior local exhaust devices typically have a swirler disposed near the inlet of the exhaust pipe and forming a vortex. The airflow generated by the rotation of the cyclone forms a vortex at the periphery of the discharge airflow of the polluted air rising from the pollution source along the rotation center axis of the cyclone toward the air inlet of the exhaust pipe. The vortex flow thus formed acts as an air curtain that interrupts the source of pollution from the surrounding space, so that the polluted air is more efficiently sucked into the exhaust pipe.

Also, korean registered patent No. 10-1606862 discloses another example of a conventional partial exhaust apparatus having a cyclone forming a vortex and a guide member diffusing an air curtain formed by the vortex in a vertical direction. Such a partial exhaust apparatus is advantageous in that exhaust efficiency can be improved since it can more easily and efficiently suck and exhaust polluted air away from the exhaust pipe.

As described above, in the partial exhaust apparatus using the cyclone, the vortex flow formed by the cyclone serves as an air curtain around the exhaust gas flow. However, when there is a wall or other devices or workers in the vicinity of the pollution source, the vortex flow formed by the cyclone collides with the surrounding wall, devices or workers, and thus, its flow is unstable and random. As described above, when the flow of the swirl used as the air curtain is unstable, there is a problem that the exhaust gas flow to the exhaust pipe is also unstable and the exhaust efficiency is lowered. In particular, the direction of the vortex forming the air curtain and the direction of the exhaust airflow are opposite to each other, and therefore, in the case where the flow of the vortex cannot be stabilized surely, the flow itself of the vortex may rather obstruct the exhaust airflow.

Therefore, in the existing partial exhaust apparatus using a cyclone, an improvement for more stabilizing the exhaust gas flow is required.

Disclosure of Invention

Technical problem

The present invention has been made to solve the conventional drawbacks as described above, and an object thereof is to provide a partial exhaust apparatus which can improve exhaust efficiency by forming a more stable exhaust airflow using a case surrounding a cyclone.

Technical scheme

In order to solve the above-described technical problem, a partial exhaust apparatus according to an embodiment of the present invention is characterized by including:

a drive section;

a cyclone provided near an air inlet of an exhaust pipe to be rotated by the driving part to generate a vortex, and including a rotating plate attachment connected to the driving part and formed at a central region thereof with an exhaust hole communicated to the exhaust pipe, and a plurality of vanes provided at the rotating plate attachment to rotate together with the rotating plate attachment and generate an air flow forming the vortex; and

a case accommodating the cyclone therein, and,

an opening is formed in a portion of the front wall of the box facing the vortex discharge end of the cyclone that corresponds to the vortex discharge end,

at least one auxiliary air outlet for discharging air inside the box to the outside is formed on the other wall of the box,

a space is formed between the pencil of the case in which the opening is formed and the vortex discharge end of the cyclone at the rotation center axis of the cyclone, and a vortex generated by the cyclone and passing through the vortex discharge end flows into the inside of the case through the space.

In the embodiment of the present invention, the vortex flow discharge end portion of the cyclone is provided at a position receded from the front wall of the tank to the inside of the tank, and therefore, a gap between the vortex flow discharge end portion of the cyclone and the front wall of the tank may be formed in front of the vortex flow discharge end portion of the cyclone along the rotation center axis of the cyclone. The auxiliary exhaust port may be formed at least one of the sidewalls of the case, and an exhaust fan is provided at the auxiliary exhaust port or an auxiliary exhaust pipe is connected thereto. Preferably, the air outlet may be provided adjacent to a front wall of the box in which the opening is formed.

The auxiliary exhaust port may be formed at a rear wall facing the front wall of the case, and an exhaust fan may be provided at the auxiliary exhaust port or an auxiliary exhaust pipe may be connected thereto. A fan may be provided inside the case to flow a vortex flowing into the inside of the case through the space toward the auxiliary exhaust port.

The diameter of the opening may be greater than the outer diameter of the vortex discharge end of the cyclone.

The cyclone may further include a first guide member having a cylindrical shape provided at an outer side edge portion of the rotation plate member, a second guide member having a cylindrical shape provided to surround outer side end portions of the plurality of vanes and to form an air flow path between the first guide member and the second guide member, and a third guide member provided to cover upper portions of the plurality of vanes.

The plurality of blades may be radially disposed on an upper surface of the rotating plate member, and outer ends of the plurality of blades may protrude toward an outer edge of the rotating plate member and extend to a lower end of an outer circumferential surface of the first guide member.

The swirler may further include a lingering member provided between the rotating plate member and the third guide member to linger the airflow generated by the plurality of vanes.

The trailing member may include a plurality of walls provided between the upper surface of the rotating plate part and the lower surface of the third guide part to have a height less than that of the plurality of blades.

The plurality of walls may be disposed to form a curved airflow path through the rotation plate member and the third guide member.

The walls have different diameters and are spaced apart from each other in a radial direction centering on a rotation center axis of the cyclone and are arranged in the form of concentric circles, wherein a portion of the walls is arranged such that an upper surface of the rotation plate member protrudes upward, and the remaining portion is arranged such that it protrudes downward from a lower surface of the third guide member.

The plurality of walls include at least two first walls protruding upward from an upper surface of the rotating plate member and at least two second walls protruding downward from a lower surface of the first guide member, wherein the at least two first walls and the at least two second walls are alternately disposed in a direction from an outer edge of the rotating plate member to a rotation center axis.

The partial exhaust apparatus may further include: an outer guide member provided to guide a vortex flow generated by the swirler around an outer periphery of the swirler and in a direction parallel to a rotation center axis of the swirler; an inner guide member that is provided inside the outer guide member and forms a vortex flow path between the inner guide member and the outer guide member, through which a vortex generated by the swirler passes; and an outside air guide unit provided to the outside guide member and guiding air outside the outside guide member to a vortex flowing into the inside of the case.

The outside air guide member may include: an air passage forming member provided outside a lower end portion of the outer guide member and forming a passage through which air inside the box passes between the outer guide member and the air passage forming member; and a plurality of air guide members provided between the outer guide member and the air passage forming member, and guiding air inside the case in a direction parallel to a rotation center axis of the cyclone.

The outer passage forming member has a cylindrical shape surrounding an outer circumferential surface of the outer guide member and extending in a direction parallel to a rotational center axis of the cyclone, and is disposed to be spaced apart from the outer circumferential surface of the outer guide member, and the plurality of air guide members have a plate shape extending in a direction parallel to the rotational center axis of the cyclone, and are disposed at regular intervals along the outer circumferential surface of the outer guide member.

The local exhaust means may further comprise a first air supply means provided inside the box and supplying air inside the box to the plurality of vanes of the cyclone.

The local air discharging means may further include a second air supplying means which is provided inside the box and supplies air inside the box to the outside air guide unit.

A portion of the opening of the box is covered by a shutter so that the opening of the box may have a substantially semicircular shape.

Inside the box, between a front wall of the box and the vortex flow discharge end in a direction of a rotation center axis of the cyclone, a first partition plate is provided in parallel to the front wall, wherein a first interval is formed between the first partition plate and the front wall, and a second interval is formed between the first partition plate and the vortex flow discharge end,

the first and second spaces are communicated to the auxiliary exhaust port, and thus at least a portion of the vortex flow and the outside air flowing into the inside of the case is discharged to the outside of the case through the prime auxiliary exhaust port through the first and second spaces.

The first partition plate is fixed to a side wall of the tank, and a concave portion concavely formed in a semicircular shape is formed concentrically with an opening formed on a front wall of the tank at a lower side edge of the first partition plate, wherein a radius of the concave portion is smaller than a radius of the opening and larger than a radius of the vortex discharge end, and the first interval may be smaller than the second interval.

The two first partition plates may be disposed to be spaced apart from and parallel to each other, and the radius of the concave portion of each of the two first partition plates may be different from each other.

Inside the tank, a second partition plate is provided in parallel to the first partition plate between the rear wall of the tank and the first partition plate in the rotational flow center axis direction of the cyclone, and the second partition plate divides an upper space in the internal space of the tank into a front space between the front wall of the tank and the second partition plate and a rear space between the rear wall of the tank and the second partition plate.

The upper side edge and both edges of the second partition are fixed to the side walls of the box, a semicircular recess is formed at the lower side edge of the second partition in a concave manner, and the inner circumferential surface of the recess is closely fixed to the outer circumferential surface of the outer guide member.

The partial exhaust device is formed such that a rotation center axis of the cyclone is horizontal, and further includes an additional exhaust pipe which passes through a lower side of the cyclone inside the case and an air inlet of which is provided to be open to a front side of the case, wherein the additional exhaust pipe sucks in and exhausts polluted air through the exhaust pipe.

A plurality of cyclones may be provided in the tank in parallel, and the opening may be formed in a portion of one wall of the tank corresponding to each swirl discharge end portion of the plurality of cyclones.

Two cyclones adjacent to each other among the plurality of cyclones rotate in opposite directions, and a vortex flow guide member that guides a flow of a vortex flow generated by each cyclone is provided between the two cyclones adjacent to each other.

Advantageous effects

In the local exhaust apparatus according to the embodiment of the present invention, the vortex flow formed by the cyclone widely spreads sideways and flows into the inside of the case surrounding the cyclone. Therefore, the exhaust airflow of the polluted air generated in the pollutant generating region can stably flow to the exhaust pipe without being directly affected by the vortex, and therefore, the exhaust efficiency can be further improved.

Brief description of the drawings

Fig. 1 is a schematic view illustrating a partial exhaust apparatus according to a first embodiment of the present invention.

FIG. 2 is a top perspective view of the cyclone shown in FIG. 1.

FIG. 3 is a bottom perspective view of the swirler shown in FIG. 1.

Fig. 4 is a perspective view of the partial exhaust apparatus shown in fig. 1, viewed from the outside of the case, showing an example in which the rotation center axis of the swirler is disposed horizontally.

Fig. 5 is a perspective view illustrating an example in which a first air supply device is provided in the cyclone shown in fig. 2.

Fig. 6 is a schematic view illustrating a partial exhaust apparatus according to a second embodiment of the present invention.

Fig. 7 is a schematic view illustrating a partial exhaust apparatus according to a third embodiment of the present invention.

Fig. 8 is a top perspective view of the inner guide member, the outer guide member, and the outside air guide unit shown in fig. 7.

Fig. 9 is a perspective view of the partial exhaust apparatus shown in fig. 7, viewed from the outside of the case, showing an example in which the rotation center axis of the swirler is disposed horizontally.

Fig. 10 is a perspective view illustrating a second air supply device for the outside air guide unit shown in fig. 8.

Fig. 11 is a perspective view illustrating an example in which a louver is provided to an opening of a case of the partial exhaust apparatus shown in fig. 9.

Fig. 12 is a schematic view showing an example in which a first partition and a second partition are provided in a case of the local exhaust apparatus shown in fig. 11.

Fig. 13A is a perspective view illustrating the first partition and the second partition shown in fig. 12 separately from the tank, and fig. 13B is a perspective view illustrating a modification of the first partition illustrated in fig. 13A.

Fig. 14 is a schematic cross-sectional view illustrating the partial exhaust apparatus shown in fig. 12 when it is cut vertically along the rotation center axis.

Fig. 15 is a partial sectional view illustrating an example in which two first separators are provided in the partial exhaust device shown in fig. 14.

Fig. 16 is a schematic cross-sectional view illustrating a modification of the local exhaust apparatus shown in fig. 12 and 14.

Fig. 17 is a perspective view illustrating an example in which two cyclones are horizontally arranged in one tank.

Fig. 18 is a schematic perspective view illustrating a plurality of partial exhaust devices vertically disposed.

Fig. 19 is a schematic vertical sectional view taken along the line B-B' shown in fig. 18.

Detailed Description

Hereinafter, a partial exhaust apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following drawings, like reference numerals denote like constituent elements.

Fig. 1 is a schematic view illustrating a partial exhaust apparatus according to a first embodiment of the present invention, fig. 2 is a top perspective view of a cyclone shown in fig. 1, fig. 3 is a bottom perspective view of the cyclone shown in fig. 1, and fig. 4 is a perspective view of the partial exhaust apparatus shown in fig. 1, viewed from the outside of a case, showing an example in which a rotation center axis of the cyclone is disposed to be horizontal.

As illustrated in fig. 1, the partial exhaust apparatus 100 according to the present invention may be arranged such that the rotation center axis C of the swirler 120 is vertical. Also, as shown in fig. 4, the partial exhaust apparatus 100 according to the present invention may be arranged such that the rotation center axis C of the swirler 120 is horizontal. Although not shown, the partial exhaust apparatus 100 according to the present invention may be configured such that the rotation center axis C of the swirler 120 thereof is inclined at a predetermined angle. Hereinafter, for simplicity and clarity of illustration and convenience of description, the partial exhaust apparatus 100 according to the present invention will be illustrated and described with respect to an example in which the rotation center axis C of the swirler 120 is disposed to be vertical. In fig. 4, the partial exhaust apparatus 100 is illustrated in a state where the rotation center axis C of the swirler 120 is horizontal, in order to more clearly show the partial exhaust apparatus 100 according to the present invention.

Referring to fig. 1 to 4, a partial exhaust apparatus 100 according to a first embodiment of the present invention includes a driving part 110, a cyclone 120 disposed near an intake port of an exhaust pipe 101 to rotate to transmit an acoustic vortex Fs, a case 140 surrounding a periphery of the cyclone 120, and

exhaust members

146 and 148 for exhausting air inside the case 140 to the outside.

Specifically, the exhaust duct 101 is for sucking contaminated air through an air inlet at one end thereof and discharging it to an external pipeline, and may be formed of various pipes such as a known flexible pipe or a metal pipe. The exhaust pipe 101 may be inserted into the case 140 from the outside of the case 140 through the rear wall 140b of the case 140. Also, the polluted air may be sucked into the inside of the exhaust duct 101 by a natural negative pressure, and may be forcibly sucked into the inside of the exhaust duct 101 by an exhaust fan (for example, sirocco fan)102 provided in the exhaust duct 101. The sirocco fan 102 may be provided near the inlet of the exhaust duct 101 as shown in fig. 1, but is not limited thereto, and may be provided near the outlet of the exhaust duct.

The driving part 110 is connected to the cyclone 120 and provides a driving force to rotate the cyclone 120. The driving part 110 may include a driving motor 111 and a rotation shaft 112 connected to the driving motor 111. The driving motor 111 may be disposed on the exhaust duct 101 and also disposed inside the case 140, but is not limited thereto. For example, the driving motor 111 may be provided in the case 140 or in a separate support bracket, or may be provided outside the case 140. In the case where the driving motor 111 is provided outside the case 140, the rotating shaft 112 may be inserted inside the case 140 and coupled to the cyclone 120.

As described later, the rotation shaft 112 is coupled to a rotation shaft coupling portion 127 provided at a rotation center portion of the rotating plate member 121 of the cyclone 120. As shown in fig. 1, when the sirocco fan 101 is provided near the air inlet of the exhaust duct 101, the driving unit 110 may be used to rotate the sirocco fan 102 together with the cyclone 120. In the case where the sirocco fan 102 is disposed in the vicinity of the outlet of the exhaust duct 101, a separate driving motor for rotating the sirocco fan 102 is provided.

However, the driving part 110 having the structure as described above is merely exemplary, and may have various structures capable of providing power to rotate the cyclone 120, and the position of the disposition thereof is not limited to the above-described position. For example, the driving part 110 may be provided inside or outside the case 140 by a member such as a bracket, or the cyclone 120 may be rotated by a power transmission member such as a belt or a gear.

The cyclone 120 is disposed near an inlet of the exhaust pipe 101, rotates to generate a vortex Fs, and is disposed inside the casing 140. The swirler 120 basically includes a rotating plate member 121 that is provided near the gas inlet of the exhaust pipe 101 to rotate, and a plurality of vanes 130 that are provided on the rotating plate member 121 and generate the airflow Fa forming the vortex Fs.

The rotating plate member 121 may be formed in a circular plate shape having a diameter larger than that of the exhaust pipe 101. The rotating plate member 121 is disposed near an air inlet of the exhaust pipe 101, an exhaust hole communicating with the exhaust pipe 101 is formed in a central region of the rotating plate member 121, and contaminated air is sucked into the exhaust pipe 101 through the exhaust hole 122.

The rotation plate member 121 is connected to the driving part 101 to rotate. To this end, a rotary shaft coupling portion 127 having a protruding boss shape is provided at a rotation center portion of the rotating plate member 121, and the rotary shaft 112 of the driving motor 111 is coupled to the rotary shaft coupling portion 127. Specifically, a rotation shaft insertion hole 128 is vertically formed through the center of the rotation shaft coupling portion 127, and the rotation shaft 112 of the driving motor 111 is firmly coupled by a fixing screw 129 after being inserted into the rotation shaft insertion hole 128. The exhaust hole 122 may be formed at the periphery of the rotation shaft coupling portion 127, and the rotation shaft coupling portion 127 may be supported by being connected to the rotation plate member 121 by a plurality of connection portions 126 crossing the exhaust hole 122 in the radius direction.

Also, a cylindrical exhaust passage forming member 123 may be provided in the rotating plate member 121, which is provided to surround the periphery of the exhaust hole 122 and forms an exhaust passage Pe communicating to the exhaust pipe 101. The exhaust passage forming member 123 may have an inner diameter larger than an outer diameter of the exhaust pipe 10, and may be provided on upper and lower surfaces of the rotating plate member 121. The exhaust passage forming member 123 may also have an outer diameter smaller than the inner diameter of the exhaust pipe 10.

The plurality of blades 130 rotate together with the rotating plate member 121 to generate the airflow Fa, so that the airflow Fa formed by the plurality of blades 130 forms a rotating vortex Fs.

The plurality of blades 130 may be fixedly provided on the upper surface of the rotating plate member 121, which is the surface on the side of the exhaust pipe 101, and may be radially provided at the peripheral edges of the exhaust holes 122 and the exhaust passage forming member 123. Each of the plurality of blades 130 may have a shape upstanding from the upper surface of the rotating plate member 121 and extending in a radius direction. Inner side ends of the plurality of vanes 130 may be spaced apart from an outer circumferential surface of the exhaust passage forming member 123 at a preset interval. The outer side ends of the plurality of blades 130 may protrude to the outside of the outer side edge of the rotating plate member 121 by a predetermined length. In other words, the plurality of blades 130 may be formed to have an outer diameter greater than that of the rotating plate member 121.

Various components other than the rotating plate member 121 and the plurality of vanes 130 may be added to the cyclone 120. Preferably, the cyclone 120 may further include a first guide part 131, a second guide part 132, and a third guide part 133 that guide the airflow Fa generated by the plurality of blades 130, and a delaying member that delays the airflow Fa.

The first guide member 131 is fixedly provided at an outer edge portion of the rotating plate member 121 and rotates together with the rotating plate member 121. The first guide member 131 may be formed in a cylindrical shape extending downward from an outer edge of the rotating plate member 121 in parallel with the rotation center axis C. The first guide member 131 may have an outer diameter, which may be the same as that of the rotating plate member 121.

In a case where the outer side ends of the plurality of blades 130 protrude to the outside of the outer edge of the rotating plate member 121 by a predetermined length as described above, the outer side ends of the plurality of blades 130 may be extended to the lower end of the outer circumferential surface of the first guide member 131 in a direction parallel to the rotation central axis C, and thus, the plurality of blades 130 may be respectively formed to be

A sub-shape.

The second guide member 132 may be disposed to surround the circumference of the plurality of blades 130. The second guide member 132 may be formed in a cylindrical shape having an inner diameter larger than an outer diameter of the first guide member 131. In other words, the plurality of blades 130 are fixedly disposed between the first guide member 131 and the second guide member 132, and thus the rotating plate member 121, the first guide member 131, the plurality of blades 130, and the second guide member 132 rotate together. The lower end of the second guide member 132 may be located at the same height as the lower end of the first guide member 131. The third guide part 133 may be provided to cover an upper portion of the plurality of blades 130. The third guide member 133 is attached to the upper ends of the plurality of blades 130 so as to be rotatable together with the plurality of blades 130. The third guide member 133 is formed in an annular plate shape having an inner diameter larger than an outer diameter of the exhaust passage forming member 123 and an outer diameter larger than an outer diameter of the rotating plate member 121. Also, an upper end portion of the second guide member 132 is fixedly coupled to an outer side edge portion of the third guide member 133. Accordingly, a preset gap G is formed between the outer circumferential surface of the exhaust passage forming member 123 and the outer circumferential surface of the third guide member 133, and external air may flow into between the rotating plate member 121 and the third guide member 133 through the gap G.

According to the above-described structure, the first guide member 131, the second guide member 132, and the third guide member 133 rotate together with the rotating plate member 121 and the plurality of blades 130. An airflow path Pa through which the airflow Fa generated by the plurality of blades 130 passes is formed among the rotating plate member 121, the first guide member 131, the second guide member 132, and the third guide member 133. Specifically, the third guide part 133 guides the airflow Fa passing through the airflow passage Pa in a direction orthogonal to the rotation center axis C (i.e., a horizontal direction), and the first guide part 131 and the second guide part 132 serve to guide the airflow Fa downward in a direction parallel to the rotation center axis C (i.e., a vertical direction in the example shown in fig. 1).

When the plurality of vanes 130 rotate, air flows from the outside of the cyclone 120 into the inside of the air flow path Pa between the rotating plate member 121 and the third guide member 133 to form an air flow Fa. The airflow Fa thus generated is rotated by the plurality of vanes 130 to form a vortex Fs, and the vortex Fs thus formed is discharged through the vortex discharge end of the swirler 120. At this time, the vortex Fs flows out from the lower end portion of the airflow path Pa, is widely diffused by the centrifugal force, and flows into the case 140. This is described again below.

Also, a plurality of auxiliary vanes 130a may be provided in the air flow path Pa between the first guide member 131 and the second guide member 132. The plurality of auxiliary blades 130a are disposed along the outer circumferential surface of the first guide member 131 at preset intervals, and may be alternately disposed with the plurality of blades 130. The plurality of auxiliary blades 130a may be respectively formed in a quadrangular plate shape parallel to the rotation central axis C (i.e., vertically elongated), and the upper ends thereof may extend to the lower surface of the third guide part 133 and the lower ends thereof may extend to the lower end of the first guide part 131. The plurality of auxiliary blades 130a having the aforementioned structure are used to apply an additional rotational force to the air flow Fa passing through the air flow path Pa, which will be described again hereinafter.

The delaying member may have various forms capable of delaying the air flow Fa, and preferably may be configured to include a plurality of

walls

135 and 136 disposed between the upper surface of the rotation plate part 121 and the lower surface of the third guide part 133. Specifically, the plurality of

walls

135 and 136 have different diameters from each other, and are disposed in the form of concentric circles spaced apart in the radial direction centering on the rotation center axis C. The plurality of

walls

135 and 136 may include at least two first walls 135 protruding upward from the upper surface of the rotation plate member 121 and having a ring shape and at least two second walls 136 protruding downward from the lower surface of the third guide member 133 and having a ring shape, wherein the at least two first walls 135 and the at least two second walls 136 may be spaced apart from each other and alternately disposed along an outer side edge from the rotation plate member 121 toward the rotation center axis C side.

The first and

second walls

135 and 136 are formed to have a height smaller than that of the blade 130, whereby a predetermined interval is formed between the upper end of the first wall 135 and the lower surface of the first guide member 133, and a predetermined interval is formed between the lower end of the second wall 136 and the upper surface of the rotation plate member 121. The height of each of the first wall 135 and the second wall 136 is preferably 50% to 75% of the height of the blade 130. When the height of the first and

second walls

135 and 136 is less than 50% of the height of the blade 130, as described below, the effect of delaying the airflow Fa may be insignificant, and when the height of the first and

second walls

135 and 136 is greater than 75% of the height of the blade 130, the airflow Fa may not smoothly pass through the interval due to the interval being reduced too much.

Since the path of the air flow Fa passing between the rotating plate member 121 and the first guide member 133 is formed to be curved by the first wall 135 and the second wall 136 having the structure as described above, the air flow Fa is dragged by the first wall 135 and the second wall 136. When the airflow Fa is thus dragged by the plurality of

walls

135, 136, the airflow Fa continues to be subjected to the force exerted by the plurality of blades 130 during the dragging, and as a result, the vortex Fs rotational moment formed by the airflow Fa further increases. As the rotational moment of the vortex Fs increases, the centrifugal force of the vortex Fs further increases, and therefore, the vortex Fs can flow out from the lower end portion of the airflow passage Pa and spread more widely.

The case 140 is formed to surround the circumference of the cyclone 120 having the aforementioned structure. In other words, the cyclone 120 is accommodated inside the casing 140. As described above, the driving unit 110 may be provided inside the case 140 or outside the case 140.

The case 140 may have, for example, a rectangular parallelepiped shape as shown in fig. 4. In the front wall 140a of the case 140 opposite to the vortex flow discharge end of the cyclone 120, an opening 142 is formed at a portion corresponding to the vortex flow discharge end of the cyclone 120, and the contaminated air is sucked toward the cyclone 120 through the opening 142.

The case 140 may have, for example, a rectangular parallelepiped shape as shown in fig. 4. In a front wall 140a of the case 140 opposite to the vortex flow discharge end of the cyclone 120, an opening 142 is formed at a portion corresponding to the vortex flow discharge end of the cyclone 120, and the contaminated air is sucked toward the cyclone 120 through the opening 142.

The opening 142 of the case 140 may have a circular shape as illustrated in fig. 4, but is not limited thereto. For example, as illustrated in fig. 11, the opening 142 may be partially covered by a partition to have an approximately semicircular shape, which is described again below with reference to fig. 11.

The opening 142 of the case 140 is formed to have a diameter Dh larger than an outer diameter Ds of the vortex discharge end of the cyclone 120. The diameter Dh of the opening 142 of the box 140 may be about 100mm to 200mm larger than the outer diameter Ds of the vortex discharge end of the cyclone 120. For example, in the case where the outer diameter Ds of the cyclone 120 is about 360mmm to 420mmm, the diameter Dh of the opening 142 may be about 520 mm.

The cyclone 120 is disposed inside the case 140 such that a vortex flow discharge end of the cyclone 120 is set at a position retreated from the front wall 140a of the case 140, on which the opening 142 is formed, to the inside of the case 140. Therefore, a gap H between the vortex flow discharge end of the cyclone 120 and the front wall 140a of the case 140 in which the opening 142 is formed in front of the vortex flow discharge end of the cyclone 120 along the rotation center axis C of the cyclone 120. The spacing H between the front wall 140a of the box 140 and the vortex discharge end of the cyclone 120 may be about 30mm to 120mm, preferably 50mm to 100mm, more preferably 70mm to 80 mm.

Due to the above-described structure, the vortex Fs discharged through the lower end portion of the air flow path Pa formed at the vortex discharge end portion of the cyclone 120 is widely spread laterally by centrifugal force, and flows into the case 140 through the gap H between the front wall 140a of the case 140 and the vortex discharge end portion of the cyclone 120.

It is preferable to make the inside of the case 140 in a predetermined negative pressure state so that the vortex Fs can smoothly flow into the inside of the case 140. For this, an air discharge member for discharging air inside the case 140 to the outside is provided in the case 140. As the exhaust member, at least one auxiliary exhaust port 146 may be formed in the case 140, and an exhaust fan 148 for exhausting air (which includes the vortex Fs and outside air Fo described below) flowing into the inside of the case 140 to the outside of the case 140 through the auxiliary exhaust port 146 may be disposed in the auxiliary exhaust port 146. An auxiliary exhaust duct may be connected to the auxiliary exhaust port 146 instead of the exhaust fan 148, or an exhaust fan and an auxiliary exhaust duct may be provided at the same time.

Specifically, the auxiliary exhaust port 146 may be formed on a wall different from the front wall 140a of the case 140 in which the opening 142 is formed, and preferably, may be formed on any one of the side walls 140C parallel to the rotation central axis C of the cyclone 120. In other words, the auxiliary exhaust port 146 and the exhaust fan 148 are formed on any one of the side walls 140c connected to the edge of the front wall 140a of the case 140 at a right angle. Preferably, as shown in fig. 4, in the case where the partial exhaust apparatus 100 is disposed such that the rotation center axis C of the cyclone 120 is horizontal, the auxiliary exhaust port 146 and the exhaust fan 148 are formed at an upper side wall 140C among the side walls of the case 140. More preferably, the auxiliary exhaust port 146 is formed in the side wall 140c of the case 142 and is disposed adjacent to the front wall 140a formed with the opening 142. In this case, at least a part of the vortex Fs and the outside air Fo previously flowing into the inside of the case 140 rapidly flows toward the auxiliary exhaust port 146 without staying near the opening 142 and is exhausted to the outside of the case 140 by the exhaust fan 148, and therefore, the vortex Fs and the outside air Fo subsequently flowing into the inside of the case 140 can more smoothly flow in.

Also, at least two auxiliary exhaust ports 146 may be formed to be spaced apart from each other, and an exhaust fan 148 may be provided at each of the at least two auxiliary exhaust ports 146.

Hereinafter, the operation of the partial exhaust device 100 according to the first embodiment of the present invention having the aforementioned structure will be described.

Referring to fig. 1, when the rotating plate member 121 and the plurality of vanes 130 start to rotate by the driving part 110, air outside the cyclone 120 (air inside the case 140) flows into the airflow path Pa between the rotating plate member 121 and the third guide member 133 to generate the airflow Fa. The airflow Fa forms a vortex Fs that rotates in the rotational direction of the plurality of blades 130. When the exhaust operation is performed through the exhaust pipe 101, the exhaust airflow Fe is formed as the polluted air in the pollutant generating area a rises toward the exhaust hole 122 formed in the rotating plate member 121.

The air flow Fa is dragged by the plurality of

walls

135 and 136 provided between the rotating plate member 121 and the third guide member 133, and continues to be subjected to the force applied by the plurality of blades 130 during the dragging. As a result, the rotational moment of the vortex Fs formed by the airflow Fa increases, and therefore, the centrifugal force of the vortex Fs increases. Therefore, the vortex Fs flows out from the lower end portion of the airflow passage Pa formed at the vortex discharge end portion of the swirler 120 and widely spreads.

Further, since the plurality of blades 130 are vertically extended to the lower end portion of the outer circumferential surface of the first guide member 131, the airflow Fa forming the vortex Fs continues to receive the force applied by the plurality of blades 130 until it flows out of the lower end portion of the airflow passage Pa. Therefore, the centrifugal force of the vortex Fs further increases, and the vortex Fs can flow out of the lower end portion of the airflow passage Pa and spread more widely.

Further, since the plurality of auxiliary vanes 130a are provided in the airflow path Pa between the first guide member 131 and the second guide member 132, the airflow Fa forming the vortex Fs is additionally subjected to the force exerted by the plurality of auxiliary vanes 130a until it flows out from the lower end portion of the airflow path Pa. Therefore, the centrifugal force of the vortex Fs further increases, and the vortex Fs flowing out from the lower end portion of the airflow passage Pa can be spread more widely.

As described above, the vortex Fs discharged through the lower end portion of the airflow path Pa formed at the vortex discharge end portion of the cyclone 120 can be widely spread and smoothly flow into the case 140 through the gap H between the front wall 140a of the case 140 and the vortex discharge end portion of the cyclone 120. At this time, since the exhaust fan 148 provided in the case 140 discharges a part of the vortex Fs flowing into the case 140 at the front to the outside of the case 140 as described above, the vortex Fs flowing into the case 140 at the rear can flow into the case 140 more smoothly. As described above, the flow of the vortex Fs flowing into the inside of the case 140 flows into the airflow path Pa between the rotating plate member 121 and the third guide member 133 through the gap G formed between the outer circumferential surface of the exhaust path forming member 123 and the inner circumferential surface of the third guide member 133.

The outside air Fo existing near the opening 142 of the case 140 also flows into the case 140 with the flow of the vortex Fs flowing into the case 140. This flow of the outside air Fo serves as a flow guide fence (air fence) that surrounds the exhaust flow Fe while suppressing the exhaust flow Fe from dispersing to the outside. In particular, the flow direction of the outside air Fo is the same as or similar to the direction of the exhaust airflow Fe, and therefore, the flow of the outside air Fo is used to guide the exhaust airflow Fe without obstructing the exhaust airflow Fe.

As described above, most of the airflow of the outside air Fo flowing into the case 140 with the flow of the vortex Fs is discharged to the outside of the case 140 by the exhaust fan 148, and the rest flows into the airflow path Pa between the rotating plate member 121 and the third guide member 133 through the gap G together with the airflow of the vortex Fs.

When the vortex Fs falls without flowing into the case 140, the exhaust flow Fe rising toward the exhaust pipe 101 may be affected by the vortex Fs flowing in the opposite direction. Thereby, there may occur a problem that the exhaust efficiency is lowered as the exhaust flow Fe becomes unstable and a problem that a part of the exhaust flow Fe flows out to the outside with the flow of the swirl Fs, in which case the exhaust efficiency may be lowered.

However, as described above, in the local exhaust apparatus 100 according to the present invention, the vortex Fs formed by the cyclone 120 may be widely spread sideways and smoothly flow into the inside of the case 140 surrounding the cyclone 120. Therefore, the exhaust flow Fe rising toward the exhaust pipe 101 is hardly affected by the swirl Fs in the opposite direction, and can be smoothly guided by the flow of the outside air Fo rising in the same direction. As a result, the exhaust flow Fe of the polluted air generated in the pollutant generating area a can be stably raised toward the exhaust pipe 101, and thus the exhaust efficiency can be improved.

Referring to fig. 5, the partial exhaust apparatus 100 may further include a first air supply device 180 disposed inside the case 140 and supplying air inside the case 140 to the plurality of blades 130 side of the cyclone 120, and the first air supply device 180 may include a first blower 181, a first air supply duct 182, and a first connection pipe 183.

Specifically, the first blower 181 may be fixedly disposed inside the case 140 (specifically, between the cyclone 120 and the wall of the case 140), and serves to suck the air inside the case 140 and blow it into the inside of the first air supply duct 182 through the first connection pipe 183.

The first air supply pipe 182 is disposed outside the cyclone 120 and is provided to be fixed without rotation, unlike the cyclone 120. For example, the first air supply duct 182 may be fixedly installed on the outer surface of the exhaust duct 101, but is not limited thereto, and may be fixedly installed in the case 140 by a bracket (not shown) or the like. The first air supply duct 182 may have a ring shape having an air supply passage formed therein, and is disposed to surround and communicate with a gap G between the outer circumferential surface of the exhaust passage forming member 123 and the inner circumferential surface of the third guide member 133. Therefore, the first air supply duct 182 communicates to the air flow path Pa between the rotating plate member 121 and the third guide member 133 through the gap G.

The first connection pipe 183 is a pipe connecting the first blower 181 and the first air supply duct 182.

Sufficient air may be supplied to the plurality of vanes 130 of the swirler 120 by the first air supply device 100, so that the vortex Fs may be smoothly formed. Further, the first air supply device 180 sucks not only the air inside the case 140 but also a part of the vortex Fs flowing inside the case 180, whereby a smooth flow of the vortex Fs inside the case 140 can be achieved and the subsequent vortex Fs can flow more smoothly into the case 140.

The partial exhaust apparatus 100 of the embodiment shown in fig. 6 is identical to the partial exhaust apparatus 100 of the embodiment shown in fig. 1 except for the structure and position of the exhaust member, and therefore, only the exhaust member will be described hereinafter.

In the partial exhaust apparatus 100 in the embodiment shown in fig. 6, in order to bring the case 140 into a preset negative pressure state so that the vortex Fs can smoothly flow into the inside of the case 140, an exhaust member for exhausting the air inside the case 140 to the outside is provided in the case 140. As the exhaust member, at least one auxiliary exhaust port 146 is formed in the case 140, and an auxiliary exhaust pipe 141 for exhausting the air flowing into the inside of the case 140 to the outside of the case 140 through the auxiliary exhaust port 146 is connected to the auxiliary exhaust port 146.

Specifically, the auxiliary exhaust port 146 is formed on a rear wall facing the front wall 140a of the case 140 where the opening 142 is formed, and the auxiliary exhaust duct 141 is connected to the auxiliary exhaust port 146. Preferably, at least two of the auxiliary exhaust ports 146 may be formed to be spaced apart from each other, and an auxiliary exhaust pipe 141 may be connected to each of the at least two auxiliary exhaust ports 146. An exhaust fan 148 (refer to fig. 1) may be formed in the auxiliary exhaust port 146 together with the auxiliary exhaust duct 141, or an exhaust fan 148 (refer to fig. 1) may be provided instead of the auxiliary exhaust duct 141.

Also, in order to allow the vortex Fs flowing into the case 140 to flow more smoothly to the auxiliary exhaust port 146, two fans 144 may be provided inside the case 140 (e.g., on both sides of the cyclone 120).

Also, the local air discharging device 100 in the embodiment shown in fig. 6 may also include the first air supplying device 180 shown in fig. 5.

The swirler 120 shown in fig. 1 to 3 and 6 is merely to provide a preferred example for the partial venting apparatus 100 according to an embodiment of the present invention. Accordingly, the partial exhaust apparatus 100 according to the embodiment of the present invention is not limited to the structure of the swirler 120 shown in fig. 1 to 3 and 6. Accordingly, the cyclone 120 used in the partial exhaust apparatus 100 according to the present invention may have a basic structure including a rotating plate member 121 connected to the driving part 110 to rotate and a plurality of vanes 130 provided in the rotating plate member 121 and generating a vortex Fs, and may selectively include various constituent elements. For example, in the following drawings, an embodiment in which another constituent element is added to the cyclone 120 shown in fig. 1 to 3 and 6 is illustrated.

Fig. 7 is a schematic view illustrating a partial exhaust apparatus according to a third embodiment of the present invention, fig. 8 is a top perspective view illustrating an inner guide member, an outer guide member, and an external air guide unit shown in fig. 7, and fig. 9 is a perspective view of the partial exhaust apparatus shown in fig. 7, viewed from the outside of a case, which shows an example in which a rotational center axis of a swirler thereof is disposed to be horizontal.

As in fig. 1 to 4, for the sake of simplicity and clarity of illustration and convenience of description, fig. 7 and 8 illustrate the partial exhaust apparatus 100a disposed in a state where the rotation center axis C of the swirler 120 is vertical, and fig. 9 illustrates the partial exhaust apparatus 100a disposed in a state where the rotation center axis C of the swirler 120 is horizontal.

Referring to fig. 7 to 9, like the partial exhaust apparatus 100 according to the embodiment shown in fig. 1 to 4, a partial exhaust apparatus 100a according to a third embodiment of the present invention includes a driving part 110, a cyclone 120 disposed near an intake port of an exhaust pipe 101 and rotated to generate a vortex Fs, and a case 140 surrounding a periphery of the cyclone 120, and may include an auxiliary exhaust port 146 formed in the case 140 and an exhaust fan 148 disposed at the exhaust port 146 as an exhaust member for exhausting air inside the case 140 to the outside.

As the exhaust member, the partial exhaust device 100a may have an auxiliary exhaust port 141 and an auxiliary exhaust pipe 141 shown in fig. 6.

Also, the local exhaust apparatus 100a further includes: an outer guide member 150 which is provided to surround an outer periphery of the swirler 120 and guides a vortex Fs generated by the swirler 120; an inner guide member 160 that is provided inside the outer guide member 150 and forms a vortex flow path Ps between the inner guide member and the outer guide member 150, through which a vortex Fs generated by the swirler 120 passes; and an air guide unit 153 that is provided in the outer guide member 150 and guides air outside the cyclone 120 toward a vortex Fs.

The driving part 110, the exhaust duct 101, the cyclone 120, the case 140, the auxiliary exhaust port 146, and the exhaust fan 148 have already been described with reference to fig. 1 to 4, and thus, detailed description thereof is omitted.

In the embodiment shown in fig. 7 to 9, the outer guide member 150, the inner guide member 160, and the air guide unit 153 are additionally provided in the cyclone 120, and are all provided inside the case 140.

The outer guide member 150 has a cylindrical shape surrounding the outer periphery of the swirler 120 and extending a predetermined height in a direction (e.g., a vertical direction) parallel to the rotation center axis C. The outer guide member 150 is disposed to be spaced apart from an outer circumferential surface of the cyclone 120 (specifically, an outer circumferential surface of the second guide member 132) at a predetermined interval, and an upper end portion thereof may be fixed to a support member 170 disposed above the cyclone 120. Therefore, even if the swirler 120 rotates, the outer guide member 150 does not rotate.

The support member 170 may have, for example, a plate shape, but is not limited thereto, and may have various shapes capable of supporting the outer guide member 150. The support member 170 may be provided to be fixed with respect to the exhaust pipe 101 or the case 140. The cyclone 120 is disposed to be spaced apart from the bottom surface of the support member 170 by a predetermined interval so that its rotation is not hindered by the support member 170. An air inflow hole 172 is formed in the support member 170 to allow air to smoothly flow into the cyclone 120.

Also, the outer guide member 150 may be formed in a cylindrical shape having a certain diameter. Also, the height of the outer guide member 150 may be appropriately determined in consideration of the distance between the cyclone 120 and the pollution source, the diameter of the cyclone 120, and the like, for example, in the range of about 100mm to 400 mm.

The outer guide member 150 having the aforementioned structure serves to guide the vortex Fs generated by the plurality of vanes 130 of the swirler 120 in a direction (e.g., a vertical direction) parallel to the rotation center axis C.

The inner guide member 160 is disposed inside the outer guide member 150. The inner guide member 160 is provided to be fixed to the outer guide member 150, and for this, a plurality of connection members 165 spaced apart from each other in a circumferential direction and extending in a radial direction may be provided between the inner guide member 160 and the outer guide member 150. The inner guide member 160 is disposed below the cyclone 120 to be spaced apart from the cyclone 120 by a predetermined interval so as not to interfere with the rotation of the cyclone 120.

Since the inner guide member 160 is formed in a cylindrical shape having a diameter smaller than that of the outer guide member 150, a vortex flow path Ps through which the vortex Fs generated by the swirler 120 passes is formed between the inner guide member 160 and the outer guide member 150. The inner guide member 160 not only forms the vortex flow path Pa as described above, but also can prevent a part of the vortex Fs passing through the vortex flow path Pa from flowing to the inner side, i.e., the exhaust gas flow Fe side.

An annular fixing plate part 161 may be provided inside the inner guide part 160. The fixing plate member 161 may be spaced apart from the rotating plate member 121 at a predetermined interval and horizontally disposed below the rotating plate member 121 of the cyclone 120.

The fixing plate member 161 is fixed to the inner guide member 160. Specifically, an outer edge portion of the fixing plate member 161 may be fixed to the inner guide member 160. Therefore, like the inner guide member 160, the fixed plate member 161 does not rotate.

Also, a center hole 162 is formed in a center region of the fixed plate member 161, and is communicated to the exhaust hole 122 formed in the rotating plate member 121, and contaminated air in the exhaust region is sucked into the exhaust pipe 101 through the center hole 162 and the exhaust hole 122. A cylindrical exhaust passage forming member 163 may be formed on the fixed plate member 161 so as to form an exhaust passage Pe communicating with the exhaust pipe 101 around the periphery of the center hole 162. The exhaust passage forming member 163 may be disposed on an upper surface of the fixing plate member 161.

Also, various attempts to further stabilize the exhaust gas flow Fe have been carried out at present. In these attempts, when the air guide unit 153 having the following structure is additionally provided in the outer guide member 150, a result that the exhaust air flow Fe becomes further stabilized and the exhaust efficiency is further increased can be obtained.

The air guide unit 153 is provided outside the lower end of the outer guide member 150, and guides air outside the cyclone 12 (specifically, outside the outer guide member 150) (air inside the case 140) to the vortex Fs side.

Specifically, the air guide part 153 may include an air passage forming part 151 and a plurality of air guide parts 152.

The air passage forming member 151 has a cylindrical shape surrounding a lower end portion of the outer circumferential surface of the outer guide member 150 and extending a predetermined height in a direction (e.g., a vertical direction) parallel to the rotation center axis C. The air passage forming members 151 are disposed to be spaced apart from each other at a predetermined interval from the outer circumferential surface of the outer guide member 150, whereby a passage through which air outside the cyclone 120 passes is formed between the outer guide member 150 and the air passage forming members 151.

The plurality of air guide members 162 are provided between the outer guide member 150 and the air passage forming member 151, guide air outside the swirler 120 in a direction (for example, a vertical direction) parallel to the rotation center axis C and cause the outside air to flow toward the swirl Fs, and may have a plate shape elongated in a direction (for example, a vertical direction) parallel to the rotation center axis C. For example, the plurality of air guide members 152 may be disposed at intervals along the outer circumferential surface of the outer guide member 150.

When the partial exhaust device 100a shown in fig. 7 to 9 having the above-described configuration is operated, airflow is also formed outside the outer guide member 150 due to the rapid flow of the swirl Fs. At this time, the air inside the case 140 is introduced into the passage between the air passage forming member 151 and the outer guide member 150 of the air guide unit 153 by the second air supply device 190, and the air introduced into the passage is guided by the air guide member 152 in a direction (i.e., a vertical direction) parallel to the rotation center axis C of the swirler 120 and flows toward the vortex Fs. This gas flow merges with the vortex Fs which is discharged through the lower end portion of the vortex flow path Pa and widely spreads laterally. Thereby, the vortex Fs is slowly changed in direction by the air flow of the air guide unit 153 and flows into the inside of the case 140. Again, the vortex Fs shown in fig. 7 may be more smoothly and smoothly bent and flow into the case 140 by the influence of the external airflow when passing through the lower end portion of the vortex flow path Pa, as compared to the vortex Fs shown in fig. 1 which is bent more sharply and flows into the case 140 after passing through the lower end portion of the airflow path Pa.

Through a number of experiments, the present applicant found that according to the air guide unit 150 having the aforementioned structure, the exhaust air flow Fe becomes more stable and the exhaust efficiency is also increased as compared to the embodiment shown in fig. 1.

Fig. 10 is a perspective view illustrating a second air supply device for the outside air guide member shown in fig. 8.

Referring to fig. 5, the partial exhaust apparatus 100a according to the present embodiment may further include a second air supply device 190 disposed inside the case 140 and supplying air inside the case 140 to the outside air guide unit 153, and the second air supply device 190 may include a second blower 191, a second air supply duct 192, and a second connection pipe 193.

Specifically, the second blower 191 may be fixedly disposed inside the case 140 (specifically, between the cyclone 120 and the wall of the case 140), and serves to suck air inside the case 140 and blow it into the inside of the second air supply duct 192 through a second connection pipe 193.

The second air supply duct 192 is disposed outside the cyclone 120 and is fixedly disposed without rotation, unlike the cyclone 120. For example, the second air supply duct 192 may be fixedly provided on the outer circumferential surface of the outer guide member 150 and the outer circumferential surface of the outside air passage forming member 151. The second air supply duct 182 may have a ring shape with an air supply passage formed therein, and is provided to communicate to the passage around an inlet of the passage between the outer circumferential surface of the outer guide member 150 and the inner circumferential surface of the air passage forming member 151.

The second connection pipe 193 is a pipe connecting the second blower 191 and the second air supply duct 192.

By supplying air from the second air supply device 190, the air flow through the air guide unit 153 can be sufficiently achieved. Further, the second air supply device 190 sucks not only the air inside the case 140 but also a part of the vortex Fs flowing inside the case 140, so that the vortex Fs flowing inside the case 140 can be smoothly made to flow, and the subsequent vortex Fs can be more smoothly flowed into the case 140.

The partial exhaust apparatus 100a according to the embodiment shown in fig. 7 to 9 may also further include a first air supply apparatus 180 illustrated in fig. 5. The first air supply pipe 182 of the first air supply device 180 is disposed at an upper portion of the support member 170 disposed above the cyclone 120, and is disposed to surround the air inflow hole 172 of the support member 170. Accordingly, since the first air supply duct 182 is communicated to the air flow path Pa between the swivel plate member 121 and the third guide member 133 through the air inflow hole 172 and the gap G, the air inside the case 140 may be supplied to the plurality of blades 130 side of the cyclone 120.

Fig. 11 is a perspective view illustrating an example in which a shutter is provided to an opening of a case of the partial exhaust apparatus illustrated in fig. 9.

Referring to fig. 11, the partial exhaust apparatus 100a illustrated in fig. 7 to 9 may be used, for example, to be installed at a welding work site to suck toxic gas generated at the time of welding work. Specifically, the local exhaust device 100a is provided beside the welding table T. At this time, the partial exhaust apparatus 100a may be disposed such that the rotation center axis C thereof is horizontal. In other words, the swirler 120 in the casing 140 of the local air-discharging device 100a is disposed such that the central axis of rotation C thereof is horizontal. Thus, the opening 142 formed in the box 140 faces the welding station T. A portion of the lower side of the opening 142 may be covered by a shield 196 and only a portion of the upper side is opened to allow toxic gas generated on the welding table T to effectively flow in. Thus, the opening 142 may be open in an approximately semi-circular shape. At this time, of the total area of the opening 142, the area covered by the louver 196 may be equal to or less than about 50%, and preferably equal to or less than about 45%.

The shroud 196 may include a first vertically disposed shroud member 196a and a second shroud member 196b extending horizontally from an upper end of the first shroud 196a through the opening 142 and toward the cyclone 120. As described above, the shutter 196 may be formed from

separate components

196a and 196b from the case 140, but is not limited thereto. For example, the shutter 196 may be integrally formed with the front wall 140a of the case 140.

The shroud 196 may be applied to the enclosure 140 of the partial exhaust 100 according to the embodiment shown in fig. 1-6.

Fig. 12 is a schematic view showing an example in which a first partition plate and a second partition plate are provided in a case of the partial exhaust apparatus shown in fig. 11, fig. 13A is a perspective view showing the first partition plate and the second partition plate shown in fig. 12 as being separated from the case, fig. 13B is a perspective view showing a modification of the first partition plate shown in fig. 13A, and fig. 14 is a schematic sectional view showing the partial exhaust apparatus shown in fig. 12 cut vertically along a rotation center axis.

Referring to fig. 12, 13A and 14, a first partition 210 and a second partition 220 may be provided inside the case 140 of the partial exhaust apparatus 100a according to the present invention.

The first partition 210 is provided between the front wall 140a of the box 140 and the vortex flow discharge end Ss of the cyclone 120 in the direction of the rotation center axis C of the cyclone 120 (for example, the horizontal direction in fig. 14), and is provided in parallel to the front wall 140a with a predetermined first interval G1 therebetween. The first separator 210 has a rectangular plate shape as a whole, and a concave portion 210d is formed at a lower side thereof. Specifically, the upper side edge 210a of the first partition 210 is closely fixed to the side wall 140C of the case 140 where the auxiliary exhaust port 146 is formed, the both side edges 210b are closely fixed to both side walls of the case 140, and the lower side edge 210C may be located at a height similar to the rotation center axis C. Thus, the height of the first partition 210 is less than the height of the case 140, preferably about half of the height of the case 140.

A semicircular recess 210d formed to be recessed upward is formed on a lower side edge 210c of the first separator 210. The center of the concave portion 210d coincides with the rotation center axis C of the swirler 120. In other words, the recess 210d is formed concentrically with the swirler 120 and the opening 120. The radius Rp of the recess 210d may be smaller than the radius Rh of the opening 142 and may be larger than the maximum radius Rs of the swirler 120 (in fig. 14, the radius of the air passage forming member 151 or the radius of the swirl discharge end Ss). For example, where the maximum radius Rs of the swirler 120 is 210mm, the radius Rp of the recess 210d may be about 240mm and the radius Rh of the opening 142 may be about 260 mm.

As described above, the first partition 210 is disposed in parallel to the front wall 140a with a preset first interval G1 therebetween, wherein the first interval G1 may be smaller than the second interval G2 between the first partition 210 and the vortex discharge end Ss in the direction of the rotation center axis C. For example, in the case where the front wall 140a of the case 140 is spaced apart from the vortex discharge end Ss by 70mm, the first spacing G1 may be about 30mm, and the second spacing G2 may be about 40 mm.

A first gap G1 between the first partition 210 and the front wall 140a and a second gap G2 between the first partition 210 and the vortex discharge end Ss are communicated to the auxiliary exhaust port 146 formed on the side wall 142c of the case 140. Therefore, the outside air Fo flowing into the inside of the box 140 through the opening 142 formed in the front wall 140a of the box 140 is divided into two airflows by the first partition 210, and the divided airflows flow to the auxiliary air outlets 146 through the first and second gaps G1 and G2, respectively. At this time, since the first interval G1 is narrower than the second interval G2, less external air Fo will flow through the first interval G1 and more external air Fo will flow through the second interval G2.

Although not illustrated in fig. 14 for the sake of complexity, the vortex Fs (see fig. 7) flowing into the inside of the box 12 also joins the flow of the outside air Fo and flows through the first interval G1 and the second interval G2 as described above.

At least a portion of the outside air Fo and the vortex Fs flowing through the first and second gaps G1 and G2 is discharged to the outside of the case 140 through the auxiliary exhaust port 146, and a portion of the outside air Fo and the vortex Fs flowing through the second gap G2 flows to the rear of the inside of the case 140. A part of the air flowing rearward in the case 140 flows into the passage between the outer guide member 150 and the air passage forming member 151 (see fig. 7), and the rest flows into the cyclone 120 through the air inflow hole 172 (see fig. 7) formed in the support member 170 via the lower space of the second partition 220.

The first partition 210 shown in fig. 13A may be replaced with a partition 211 shown in fig. 13B.

Referring to fig. 13B, the first partition 211 has a plate shape having a circular arc shape as a whole, and a concave portion 211d is formed at a lower side portion thereof. Specifically, the upper side edge 211a of the first partition 211 is formed in a convex circular arc shape, and both side ends of the upper side edge 211a may be fixed to both side walls of the case 140. A semicircular concave portion 211d formed to be concave upward is formed at a lower side edge 211c of the first partition 211. The center of the concave portion 211d coincides with the rotation center axis C of the cyclone 120. In other words, the recess 210d is formed concentrically with the swirler 120 and the opening 142. The detailed description of the concave portion 211d is the same as that of the concave portion 210d of the first partition plate 210 shown in fig. 13A.

Referring again to fig. 12, 13A and 14, the second barrier 220 is disposed between the rear wall 140b of the case 140 and the first barrier 210 in a rotation center axis C (e.g., a horizontal direction in fig. 14) of the cyclone 120, and is disposed in parallel to each of the rear wall 140b and the first barrier 21 with a predetermined interval therebetween. The first partition plate 220 has a rectangular plate shape as a whole, and a concave portion 220d is formed at a lower side portion thereof. Specifically, the upper inner edge 220a of the second partition 220 is closely fixed to the side wall 140C of the case 140 where the auxiliary exhaust port 146 is formed, the both side edges 220b are closely fixed to both side walls of the case 140, and the lower side edge 220C may be located at a height similar to the rotation center axis C. Thus, the height of the second partition 220 is less than the height of the case 140, preferably about half of the height of the case 140.

A semicircular recess 220d formed to be recessed upward is formed at a lower side edge 220c of the second barrier 220. The inner peripheral surface of the recess 220d is closely fixed to the outer peripheral surface of the outer guide member 150. Therefore, the radius of the recess 220d coincides with the radius of the outer circumferential surface of the outer guide member 150.

The second partition 220 divides an upper space in the inner space of the case 140 into a front space between the front wall 140a of the case 140 and the second partition 220 and a rear space between the rear wall 140b of the case 140 and the second partition 220.

In the inner space of the case 140, a lower space below the second barrier 220 is not separated by the second barrier 220. Therefore, as described above, a part of the outside air Fo flowing into the upper space inside the box 140 through the second gap G2 formed by the first partition plate 210 is blocked by the second partition plate 220 and does not flow horizontally, and flows into the cyclone 120 through the air inflow hole 172 (see fig. 7) of the support member 170 formed in the rear space of the second partition plate 220 through the space below the second partition plate 220. In contrast, the air flowing into the inside of the box 140 without passing through the second gap G2 formed by the first partition 210, that is, the outside air Fo flowing into the lower space of the inside of the box 140 through both sides of the louver 196 (especially, the horizontally extending second partition member 196b) flows approximately horizontally, and may flow into the cyclone 120 through the air inflow hole 172 (refer to fig. 7) formed in the supporting member 170 located in the rear space of the second partition 220. Further, a part of the outside air Fo flowing into the lower space inside the box 140 flows into the passage inside between the outer guide member 150 and the air passage forming member 151 in the space in front of the second partition 220 (see fig. 7).

Through a number of experiments, the present applicant found that, in the case where the first and

second partitions

210 and 220 are provided in the case 140, the external air Fo flows more smoothly into the case 140, a smooth flow of the external air Fo inside the case 140 can be achieved, and a smooth supply of air to the side of the cyclone 120 and to the inside of the passage between the outer guide member 150 and the air passage forming member 151 through the air inflow holes 172 formed in the support member 170 can be achieved. Thereby, the flow guide fence formed by the flow of the outside air Fo is formed into a more favorable form, and as a result, the discharge airflow Fe can be further stabilized.

Fig. 15 is a partial sectional view illustrating an example in which two first separators are provided in the partial exhaust apparatus shown in fig. 4.

Referring to fig. 15, two first partitions 210, 210' may be provided in parallel spaced apart from each other between the front wall 140a of the case 140 and the vortex discharge end Ss of the cyclone 120 in the direction of the rotation center axis C of the cyclone 120. The two first partition plates 210, 210' have the shape illustrated in fig. 13A, but may be replaced with two first partition plates 211 having the shape illustrated in fig. 13B.

Specifically, the first partition 210 is disposed in parallel to the front wall 140a with a preset first interval G11 therebetween, and the first partition 210' is disposed in parallel to the first partition 210 with a preset first interval G12 therebetween. As described above, the two first partitions 210 and 210' are provided between the front wall 140a of the tank 140 and the vortex discharge end Ss, and therefore, the interval H between the front wall 140a of the tank 140 and the vortex discharge end Ss is larger than the interval H illustrated in fig. 14, and may be, for example, about 120 mm. In this case, the two first intervals G11 and G12 may be about 30mm, and the second interval G2 may be about 60mm, respectively.

Also, the radius Rp1 of the concave portion 210d of the first partition 210 and the radius Rp2 of the concave portion of the first partition 210' may be smaller than the radius Rh of the opening 142 and may be larger than the maximum radius Rs of the cyclone 120. For example, where the maximum radius Rs of the swirler 120 is 210mm, the radius Rp1 of the recess of the first partition 210 may be about 240mm, the radius Rp2 of the recess of the first partition 210' may be about 220mm, and the radius Rh of the opening 142 may be about 260 mm.

Through a number of experiments, the present applicant found that, in the case where the two first partitions 210, 210' are provided in the case 140, the outside air Fo may flow more smoothly into the inside of the case 140, and thus, the flow guide fence formed by the flow of the outside air Fo is formed in a more favorable form, and as a result, the exhaust air flow Fe becomes more stable.

The partial exhaust apparatus 100a illustrated in fig. 16 has a structure in which two first separators 210 and 210' and an additional exhaust pipe 240 are added to the structure of the partial exhaust apparatus illustrated in fig. 14. The two first partitions 210, 210' are the same as those shown in fig. 14, and therefore, only the additional exhaust duct 240 will be described hereinafter.

The partial exhaust apparatus 100a may be disposed such that the rotation center axis C of the cyclone 120 is horizontal and the pollutant generating region a is located in front of the front wall 140a of the tank 140.

The additional exhaust pipe 240 may be disposed below the cyclone 120. Specifically, the additional exhaust duct 240 is inserted into the case 140 from the outside of the case 140 through the rear wall 140b of the case 140, and then the inlet 241 thereof is opened to the front of the case 140. An exhaust fan (for example, a sirocco fan (not shown)) is provided in the additional exhaust duct, so that the contaminated air can be sucked through an air inlet of the additional exhaust duct 240.

The polluted air generated in the pollutant generating area a located in front of the case 140 flows into the inside of the case 140 through the opening 142 formed on the front wall 140a of the case 140 to form the discharge air flow Fe, which is drawn into the inside of the cyclone 120 to be discharged through the exhaust duct 101. Also, the exhaust air flow Fe generated near the front wall 140a of the case 140 may be drawn into the inlet 241 of the additional exhaust duct 240 and exhausted through the additional exhaust duct 240.

As described above, the additional exhaust duct 240 serves to improve the overall exhaust efficiency by sucking in and exhausting the contaminated air near the intake port 241. The additional exhaust pipe 240 reduces the pressure near the intake port 241 to form a negative pressure. Accordingly, the exhaust air flow Fe rising from the pollutant generating area a away from the inlet 241 is naturally bent toward the cyclone 120 by the negative pressure near the inlet 241, and thus can easily flow into the cyclone 120. Also, since the air fence formed by the flow of the outside air Fo flowing into the inside of the box 140 is further lowered by the negative pressure below, the air fence as a whole can be formed to be more nearly horizontal and longer. Therefore, the discharge air flow Fe rising from the pollutant generating zone a can be more smoothly guided toward the cyclone 120 by such a flow fence, and especially, the polluted air far from the cyclone 120 is also guided by a longer flow fence and smoothly sucked into the inside of the cyclone 120.

In particular, according to the results of experiments conducted by the present applicant by using the local exhaust apparatus 100a of the structure illustrated in fig. 16, it was found that the exhaust air flow Fe of the polluted air generated at a position horizontally spaced apart from the opening 142 of the case 140 by about 2m was also smoothly sucked into the inside of the local exhaust apparatus 100 a.

In the case where a large amount of air contaminated with contaminants such as hazardous substances, dust, and offensive odor is generated in a wide work area, for example, a gold plating factory, a tire manufacturing factory, a semiconductor manufacturing factory, a welding work site, an automobile part manufacturing factory, a soldering work site, a video production factory, or the like, it is not easy to sufficiently discharge such a large amount of contaminated air using only one local exhaust apparatus. In this case, by providing two or more

partial exhaust devices

100, 100a according to the present invention, it is possible to effectively exhaust polluted air generated in a wider area.

For example, the plurality of

partial exhaust devices

100, 100a may be disposed in close proximity to each other or spaced apart from each other. Alternatively, the tanks 140 in the plurality of

local exhaust devices

100, 100a may be integrated with each other. In other words, a plurality of cyclones 120 may be arranged side by side inside one unified casing 140, in which case the opening 142 may be formed for each of the plurality of cyclones 120, and the openings 142 thus formed may be connected to each other. Further, depending on the installation place of the local air-discharging

devices

100 and 100a and the generation form of the polluted air, the local air-discharging devices may be used in a form in which a part of the opening 142 of the box 140 is covered by using a louver 196 or the like.

Fig. 17 is a perspective view showing an example of integrating the plurality of partial exhaust devices 100a, that is, an example of horizontally arranging two cyclones 120 in one tank 140.

Referring to fig. 11, the local exhaust apparatus 100a may be used, for example, to be installed at a welding work site to suck toxic gas generated during welding work. Specifically, the box 140 is disposed beside the welding table T, and the two cyclones 120 are disposed in parallel in the box 140. At this time, the partial exhaust apparatus 100a may be disposed such that the rotation center axis C thereof is horizontal. In other words, the two cyclones 120 are arranged such that the central axis of rotation C thereof is horizontal, and thus the opening 142 formed in the casing 140 faces the welding table T. The openings 142 are formed in two at portions corresponding to the vortex flow discharge ends of the respective two cyclones 120, however, the two openings 142 may be connected to each other. Also, a portion of the underside of the openings 142 may each be covered by a shroud 196.

When the two cyclones 120 rotate in the same direction, the vortex flows between the two cyclones 120 rotate in directions facing each other and collide, whereby a turbulent flow may be generated to hinder a smooth discharge airflow. Therefore, in the present invention, in order to enable the vortex flow generated in each of the two cyclones 120 to rotate in the same direction between the cyclones 120, the two cyclones 120 are preferably arranged to rotate in opposite directions.

Also, a vortex guide member 198 for smoothly guiding a flow of a vortex generated by each cyclone 120 between the two cyclones 120 may be further provided. Again, the vortex flow guide member 198 inhibits the vortex flows discharged from the respective vortex flow discharge ends of the two cyclones 120 from colliding with each other and guides the vortex flows smoothly into the inside of the tank 140 through the space between the tank 140 and the cyclones 120, with the result that a smooth discharge airflow is facilitated to be formed.

Fig. 18 is a schematic perspective view showing another example of the plurality of

local exhaust devices

100 and 100a being integrated with each other, in which the plurality of local exhaust devices 100a are vertically disposed, and fig. 19 is a schematic vertical sectional view taken along a line B-B' shown in fig. 18.

Referring to fig. 18 and 19, polluted air generated in a wide operation area may be effectively discharged by using a plurality of local exhaust devices 100a according to the present invention. The plurality of local exhaust devices 100a may be installed at an area where the pollutants are generated, for example, at an upper portion of the table T 'which is wide and open at the upper portion thereof, so that the polluted air generated in a wide area on the table T' may be exhausted.

Specifically, each of the plurality of partial exhaust devices 100a is spaced apart from the table T 'by a predetermined distance at an upper portion of the table T' and is disposed to be vertical. In other words, the plurality of partial exhaust devices 100a are disposed such that the rotation center axes C thereof are perpendicular, and thus, the opening 142 of the case 140 faces the table T' located below.

The plurality of partial exhaust devices 100a are disposed along the circumference of the table T 'and are disposed to be spaced apart from the upper surface of the table T' by a predetermined distance upward. For example, as shown in fig. 16, when the upper surface of the table T' has a rectangular shape, the plurality of partial exhaust devices 100a are also provided in a rectangular shape.

The shroud 196 may be disposed in the opening 142 of the enclosure 140 of each of the plurality of local exhaust devices 100 a. The louver 196 may be provided to cover a portion of the side of the space surrounded by the plurality of partial exhaust devices 100a in the opening 142 of the case 140 of each of the plurality of partial exhaust devices 100 a.

A blocking plate 230 may be horizontally provided at a height corresponding to the height of the louver 196 inside the space surrounded by the plurality of partial exhaust devices 100a, the blocking plate 230 serving to block the exhaust air flow Fe rising from the table T' from flowing out to the outside through the space surrounded by the plurality of partial exhaust devices 100 a.

In the plurality of partial exhaust devices 100a provided in the above-described form, as described above, the exhaust airflow Fo flows into the inside of the case 140 through the opening 142 of each partial exhaust device 100 a. This flow of the outside air Fo serves as a flow guide fence (air fence) that surrounds the exhaust flow Fe while suppressing the exhaust flow Fe from dispersing outward. A flow fence formed of the outside air Fo is formed at each of the plurality of partial exhaust devices 100a, and thus, the flow fence is continuously connected to surround the entire table T'. Therefore, the escape of the exhaust airflow Fe rising from the table T' to the outside is suppressed by the guide fence, so that most of the exhaust airflow Fe can flow into the plurality of local exhaust devices 100 a. As a result, the efficiency of exhausting the polluted air over a wide area can be improved.

In the above, with respect to fig. 17 to 19, the present invention is described with reference to the local exhaust apparatus 100a illustrated in the embodiment shown in fig. 7 to 16, however, the local exhaust apparatus 100 in the embodiment shown in fig. 1 to 6 may be provided as shown in fig. 17 to 19.

While the invention has been described with reference to the embodiments illustrated in the drawings, which are intended to be exemplary only, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof. Accordingly, the true scope of the invention should be determined by the appended claims.

Claims

1. A partial exhaust apparatus, comprising: a drive section;

a cyclone provided near an air inlet of an exhaust pipe to be rotated by the driving part to generate a vortex, and including a rotating plate member connected to the driving part and formed at a central region thereof with an exhaust hole communicated to the exhaust pipe, and a plurality of vanes provided to the rotating plate member to rotate together with the rotating plate member and generate an air flow forming the vortex;

a case accommodating the cyclone therein, and,

an opening is formed in a front wall of the tank facing the vortex discharge end of the cyclone at a portion corresponding to the vortex discharge end,

a space is formed between the front wall of the tank where the opening is formed and the vortex flow discharge end portion of the cyclone in the rotation center axis direction of the cyclone, and the vortex flow generated by the cyclone and discharged through the vortex flow discharge end portion flows into the tank through the space.

2. The local exhaust apparatus as claimed in claim 1,

since the vortex discharge end of the cyclone is provided at a position receding from the front wall of the box to the inside of the box, a gap between the vortex discharge end of the cyclone and the front wall of the box is formed in front of the vortex discharge end of the cyclone along the rotation center axis of the cyclone.

3. The partial exhaust apparatus of claim 1 or 2,

the auxiliary exhaust port is formed on at least one of the side walls of the case, and an exhaust fan is provided in the auxiliary exhaust port or an auxiliary exhaust pipe is connected thereto.

4. The local exhaust apparatus as claimed in claim 3,

the auxiliary exhaust opening is disposed adjacent to a front wall of the box in which the opening is formed.

5. The partial exhaust apparatus of claim 1 or 2,

the auxiliary exhaust port, in which an exhaust fan is provided or an auxiliary exhaust pipe is connected, is formed at a rear wall facing a front wall of the case.

6. The local exhaust apparatus as claimed in claim 5,

a fan is provided inside the case to flow the vortex flow flowing into the case through the space toward the auxiliary exhaust port.

7. The partial exhaust apparatus of claim 1 or 2,

the diameter of the opening is greater than the outer diameter of the vortex discharge end of the cyclone.

8. The local exhaust apparatus according to claim 1 or 2,

the cyclone further includes a first guide member having a cylindrical shape provided at an outer side edge portion of the rotation plate member, a second guide member having a cylindrical shape provided to surround outer side end portions of the plurality of vanes and to form an air flow path between the first guide member and the second guide member, and a third guide member provided to cover upper portions of the plurality of vanes.

9. The local exhaust apparatus as claimed in claim 8,

the plurality of blades are radially disposed on the upper surface of the rotating plate member, and outer ends of the plurality of blades protrude outward of an outer edge of the rotating plate member and extend to a lower end of an outer circumferential surface of the first guide member.

10. The local exhaust apparatus as claimed in claim 8,

the swirler further includes a lingering member provided between the rotating plate member and the third guide member and lingering an airflow generated by the plurality of vanes.

11. The local exhaust apparatus according to claim 10,

the trailing member includes a plurality of walls disposed to have a height smaller than a height of the plurality of blades between an upper surface of the rotating plate part and a lower surface of the third guide part.

12. The local exhaust apparatus as claimed in claim 11,

the plurality of walls are provided to form a curved airflow path through between the rotating plate member and the third guide member.

13. The local exhaust apparatus according to claim 12,

the plurality of walls have different diameters and are spaced apart from each other in a radial direction centering on a rotation center axis of the cyclone and are arranged in the form of concentric circles, wherein,

a portion of the plurality of walls is configured such that an upper surface of the rotation plate member protrudes upward, and the remaining portion is configured such that it protrudes downward from a lower surface of the third guide member.

14. The local exhaust apparatus as claimed in claim 13,

the plurality of walls include at least two first walls protruding upward from an upper surface of the rotating plate member and at least two second walls protruding downward from a lower surface of the third guide member, wherein the at least two first walls and the at least two second walls are alternately disposed in a direction from an outer edge of the rotating plate member to a rotation center axis.

15. The local exhaust apparatus as claimed in claim 1, further comprising:

an outer guide member provided to guide a vortex flow generated by the cyclone around an outer peripheral edge of the cyclone in a direction parallel to a rotation center axis of the cyclone;

an inner guide member that is provided inside the outer guide member and forms a vortex flow path between the inner guide member and the outer guide member, through which a vortex generated by the swirler passes; and

and an outside air guide unit provided to the outside guide member and guiding air outside the outside guide member to a vortex flowing into the inside of the case.

16. The local exhaust apparatus as claimed in claim 15,

the outside air guide member includes:

an air passage forming member provided outside a lower end portion of the outer guide member and forming a passage through which air inside the box passes between the outer guide member and the air passage forming member;

and a plurality of air guide members provided between the outer guide member and the air passage forming member, and guiding air inside the case in a direction parallel to a rotation center axis of the cyclone.

17. The local exhaust apparatus according to claim 16,

the outer passage forming member has a cylindrical shape surrounding an outer peripheral surface of the outer guide member and extending in a direction parallel to a rotational center axis of the swirler, and is disposed to be spaced apart from the outer peripheral surface of the outer guide member,

the plurality of air guide members have a plate shape elongated in a direction parallel to a rotational center axis of the cyclone, and are disposed at predetermined intervals along an outer circumferential surface of the outer guide member.

18. The local exhaust apparatus as claimed in claim 1 or 15,

further comprising a first air supply device disposed inside the box and supplying air inside the box to the plurality of vanes of the swirler.

19. The local exhaust apparatus as claimed in claim 15,

further comprising a second air supply device which is provided inside the box and supplies air inside the box to the outside air guide unit.

20. The local exhaust apparatus as claimed in claim 1 or 15,

a portion of the opening of the box is covered by a shutter so that the opening of the box has a substantially semicircular shape.

21. The local exhaust apparatus as claimed in claim 15,

a first partition plate is provided inside the tank in parallel with the front wall of the tank between the front wall and the vortex flow discharge end in the direction of the rotational center axis of the cyclone,

wherein a first space is formed between the first partition and the front wall, a second space is formed between the first partition and the vortex discharge end, and the first and second spaces are communicated to the auxiliary exhaust port, so that at least a part of the vortex and the outside air flowing into the inside of the box is discharged to the outside of the box through the first and second spaces and through the auxiliary exhaust port.

22. The local exhaust apparatus as claimed in claim 21,

the first partition is fixed to a side wall of the box, and a semicircular recess formed by recessing is formed at a lower side edge of the first partition to be concentric with an opening formed on a front wall of the box.

23. The local exhaust apparatus as claimed in claim 22,

the radius of the recess is smaller than the radius of the opening and larger than the radius of the vortex discharge end.

24. The local exhaust apparatus as claimed in claim 21,

the first interval is less than the second interval.

25. The local exhaust apparatus as claimed in claim 24,

the two first partition plates are disposed in parallel spaced apart from each other, and the radius of the concave portion of each of the two first partition plates is different from each other.

26. The local exhaust apparatus as claimed in claim 21,

inside the casing, between a rear wall of the casing and the first partition in a direction of a rotational center axis of the cyclone, a second partition is provided in parallel with the first partition, and,

the second partition divides an upper space in the inner space of the box into a front space between the front wall of the box and the second partition and a rear space between the rear wall of the box and the second partition.

27. The local exhaust apparatus as claimed in claim 26,

the upper side edge and both side edges of the second partition are fixed to the side walls of the box, a semicircular recess is formed in the lower side edge of the second partition in a recessed manner, and the inner circumferential surface of the recess is closely fixed to the outer circumferential surface of the outer guide member.

28. The local exhaust apparatus according to any one of claims 1, 15, or 21,

the local exhaust device is arranged in such a way that the rotating central shaft of the swirler is horizontal,

the local exhaust device further comprises an additional exhaust pipe passing through the inside of the box below the cyclone and having an air inlet opening arranged to open to the front of the box, wherein the additional exhaust pipe sucks in and exhausts polluted air through the air inlet opening.

29. The local exhaust apparatus as claimed in claim 1 or 15,

a plurality of cyclones are provided in the tank in parallel, and the opening is formed in a portion of one wall of the tank corresponding to a vortex discharge end of each of the plurality of cyclones.

30. The local exhaust apparatus as claimed in claim 29,