Patent Description:
A blower may create a flow of air to circulate air in an indoor space, or to guide an air flow toward a user. When the blower is provided with a filter, the blower may improve indoor air quality by purifying contaminated air in a room.

In the case of the blower, a discharge port through which air pressurized by the fan is discharged to the outside of the case is formed.

Recently, in order to supply clean air to a high indoor location through a blower, a blower having a plurality of discharge ports arranged vertically or having a length of the discharge opening extended vertically has been manufactured.

However, the conventional blower does not have a structure that evenly distributes the air pressurized by a fan, and thus there is a problem in that clean air is intensively supplied to only a local area through the blower.

<CIT> relates to a domestic fan, such as a tower fan, for creating an air current in a room, office or other domestic environment. <CIT> relates to an air blowing device such as a fan installed in a living room or an outdoor roof and directly used for reducing a sensible temperature due to an air current and for circulating air in a room and an air blowing device for purifying air taken into the blower. <CIT> relates to a bladeless fan. <CIT> relates to a nozzle for a fan assembly, and a fan assembly comprising such a nozzle.

The problem to be solved by the present invention is to provide a blower that evenly supplies clean air in the vertical direction. Another object of the present invention is to provide a blower having a simplified air guide structure. Another object of the present invention is to provide a blower in which the flow resistance generated by the guide is minimized. Another object of the present invention is to provide a blower in which noise generated by a guide is reduced. The problems of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The invention is specified by the independent claim.

In order to achieve the above object, a blower according to an embodiment of the present invention includes a lower case having a suction port; a fan disposed in the lower case; an upper case disposed above the lower case and having a space through which air blown from the fan flows; and a discharge port formed to extend through the upper case.

The blower includes a flow guide disposed in the space and extending in a direction crossing the longitudinal direction of the discharge port, and air flowing upward may be guided toward the discharge port by the flow guide.

A plurality of flow guides may be arranged.

The plurality of flow guides may be spaced apart from each other in the longitudinal direction of the discharge port.

The plurality of flow guides may be aligned with each other in the longitudinal direction of the discharge port.

The discharge port may be formed long along a rear end of the upper case.

The flow guide may extend from a rear end of the upper case toward a front end of the upper case.

The flow guide may be spaced apart from the front end of the upper case, and a gap may be formed between the flow guide and the front end of the upper case.

The distance formed by the flow guide disposed at a lower side may be larger than the distance formed by the flow guide disposed at an upper side.

The flow guide may include a guide front end facing the front end of the upper case and forming the gap.

The front end of the upper case may be inclined so as to approach the flow guide and the rear end of the upper case as it goes upward.

The discharge port may extend obliquely forward as it goes upward.

The front end of the upper case may be inclined so as to be closer to the flow guide and the discharge port as it goes upward.

The plurality of flow guides may include a first guide that is disposed closest to the fan and extends to be bent downward as it goes forward.

The plurality of flow guides may include a fourth guide disposed farthest from the fan and extending obliquely upward as it goes forward.

The plurality of flow guides may include a guide front end facing the front end of the upper case and a guide rear end connected to the rear end of the upper case.

The plurality of flow guides may include a second guide that extends convexly upward and has the guide rear end higher than the guide front end.

The plurality of flow guides may include a third guide positioned higher than the second guide, extending convexly upward, and having the guide rear end lower than the guide front end.

The blower may further include a heater disposed in the space.

The heater may include a heat dissipating tube extending in the vertical direction; a plurality of radiating fins passing through the heat dissipating tube, extending in a direction crossing the extension direction of the discharge port, and spaced apart from each other vertically; and a heating passage formed between the plurality of radiating fins.

The discharge port and the flow guide may be disposed between the radiating fin and a rear end of the upper case.

The flow guide may include a guide rear end connected to the upper case; and a guide front end spaced apart from the radiating fin.

The upper case includes a tower base connected to the lower case; a first tower extending upward from the tower base and having a first discharge port; a second tower extending upward from the tower base, having a second discharge port; a blowing space formed between the first tower and the second tower; a third discharge port opened vertically in the tower base; and a guide vane disposed at the third discharge port.

The third discharge port may extend in a front-rear direction from an upper surface of the tower base.

A plurality of guide vanes may be disposed to be spaced apart from each other in an extending direction of the third discharge port.

The guide vane may be disposed to be inclined forward with respect to a vertical line.

The blower may further include a diffuser disposed above the fan and guiding the air discharged from the fan upward.

The third discharge port and the guide vane may be located above the diffuser.

An upper surface of the tower base may be formed to be concave downward between the first tower and the second tower, and a third discharge port may be formed at the upper surface of the tower base.

The third discharge port may be formed in a concave portion of the upper surface of the tower base.

The discharge port may include a first discharge port extending obliquely at the first tower; and a second discharge port extending obliquely at the second tower.

The flow guide may include: a first flow guide disposed inside the first tower and extending in a direction crossing the extension direction of the first discharge port; and a second flow guide disposed inside the second tower and extending in a direction crossing the extending direction of the second discharge port.

The first tower may include a first inner wall formed to be convex toward the blowing space and the first discharge port may be formed at the first inner wall.

The second tower may include a second inner wall formed to be convex toward the blowing space and the second discharge port may be formed at the second inner wall.

Each of the first flow guide and the second flow guide may include a guide inner end contacting each of the first inner wall and the second inner wall.

Other specific details are included in the detailed description and drawings.

Embodiments of the present disclosure are described with reference to the accompanying drawings in detail. The same reference numbers are used throughout the drawings to refer to the same or like parts. Detailed descriptions of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the present disclosure.

Hereinafter, the present disclosure will be described with reference to the drawings for describing a blower according to embodiments of the present disclosure.

An overall structure of a blower <NUM> will be described first. <FIG> shows a whole appearance of the blower <NUM>.

Referring to <FIG>, the blower <NUM> may alternatively be referred to or implemented as an air conditioner, an air clean fan, or an air purifier where air is suctioned and the suctioned air is circulated.

The blower <NUM> according to the embodiments of the present disclosure may include a suction module or assembly <NUM> through which air is suctioned and a blowing module or assembly <NUM> through which the suctioned air is discharged.

The blower <NUM> may have a column or cone shape whose diameter decreases upward or toward the blowing module <NUM>, and the blower <NUM> may have a shape of a cone or truncated cone as a whole. As a cross-section and/or weight increases toward a bottom, a center of gravity may be lowered, reducing a risk of tipping. However, configuring the cross section to narrow toward the top is not necessary.

The suction module <NUM> may have a cross-sectional arear or diameter that gradually decreases the top. The blowing module <NUM> may also have a cross-sectional area or diameter that gradually decreases toward the top. The blowing module <NUM> may be provided above the suction module <NUM>, and diameters of the suction module <NUM> and blowing module <NUM> may be configured such that a transition appears smooth or seamless.

The suction module <NUM> may include a base <NUM>, a lower case <NUM> provided above the base <NUM>, and a filter <NUM> provided inside the lower case <NUM>.

The base <NUM> may be seated on a ground, floor, or other surface and may support a weight of the rest of the blower <NUM>. The lower case <NUM> and the filter <NUM> may be placed in the upper side of the base <NUM>.

An outer shape of the lower case <NUM> may be conical (or alternatively cylindrical), and a space in which the filter <NUM> is provided may be formed inside the lower case <NUM>. The lower case <NUM> has.

a suction port <NUM> opened to an inside of the lower case <NUM>. A plurality of suction ports <NUM> may be formed along a circumferential surface of the lower case <NUM>.

An outer shape of the filter <NUM> may be cylindrical (or alternatively, conical). Foreign matter contained in the air introduced through the suction port <NUM> may be filtered by the filter <NUM>.

The blowing module <NUM> has a slot or opening penetrating a middle portion so as to appear to be separated and having two columns extending vertically. The slot or opening defines a blowing space S described in more detail later. The blowing module <NUM> includes a first tower or extension <NUM> and a second tower or extension <NUM> spaced apart from each other. The blowing module <NUM> includes a tower base or connector <NUM> connecting the first tower <NUM> and the second tower <NUM> to the suction module <NUM>. The tower base <NUM> is above an upper side of the suction module <NUM> and is provided at a lower side of the first and second tower <NUM> and <NUM>.

An outer shape of the tower base <NUM> may be conical (or alternatively, cylindrical), and the tower base <NUM> may be provided on an upper surface of the suction module <NUM> to form an outer circumferential surface continuous with the suction module <NUM>.

An upper surface <NUM> of the tower base <NUM>, hereinafter called the tower base upper surface <NUM>, may be concaved downward to form a recess or groove extending forward and backward. The first tower <NUM> may extend upward from a first side 211a (e.g., a left side ) of the tower base upper surface <NUM>, and the second tower <NUM> may extend upward from the a second side 211b (e.g., a right side) of the tower base upper surface <NUM>.

The tower base <NUM> may distribute filtered air supplied from an inside of the suction module <NUM> and provide the distributed air to the first tower <NUM> and the second tower <NUM>.

The tower base <NUM>, the first tower <NUM>, and the second tower <NUM> may be manufactured as separate components, or alternatively may be manufactured integrally. The tower base <NUM> and the first tower <NUM> may form a first continuous outer circumferential surface of the blower <NUM>, and the tower base <NUM> and the second tower <NUM> may form a second continuous outer circumferential surface of the blower <NUM>.

As an alternative to the embodiment shown in <FIG>, the first tower <NUM> and the second tower <NUM> may be directly assembled to the suction module <NUM> without the tower base <NUM> or may be manufactured integrally with the suction module <NUM>.

The first tower <NUM> and the second tower <NUM> are spaced apart from each other, and a blowing space S is formed between the first tower <NUM> and the second tower <NUM>.

The blowing space S is understood as a space between the first and second towers <NUM> and <NUM> which has open front, rear, and upper sides.

The outer shape of the blowing module <NUM> including the first tower <NUM>, the second tower <NUM>, and the blowing space S may be a conical (or alternatively, cylindrical) shape.

First and second discharge ports <NUM> and <NUM> respectively formed in the first tower <NUM> and the second tower <NUM> may discharge air toward the blowing space S.

The first tower <NUM> and the second tower <NUM> may be provided symmetrically with respect to the blowing space S so that an air flow is uniformly distributed in the blowing space S, facilitating control of a horizontal airflow and a rising airflow.

The first tower <NUM> may include a first tower case <NUM> forming an outer shape of the first tower <NUM>, and the second tower <NUM> may include a second tower case <NUM> forming an outer shape of the second tower <NUM>. The tower base <NUM>, the first tower case <NUM>, and the second tower case <NUM> may be referred to as an upper case which is provided above the lower case <NUM> and has first and second discharge ports <NUM> and <NUM> through which air is discharged. The lower case <NUM> and the upper case defined by the tower base <NUM>, first tower case <NUM>, and second tower <NUM> may collectively be referred to as a "case.

The first discharge port <NUM> is formed in the first tower <NUM> to extend vertically, and the second discharge port <NUM> is formed in the second tower <NUM> to extend vertically.

A flow direction of the air discharged from the first tower <NUM> and the second tower <NUM> may be formed in the front and rear direction.

A width of the blowing space S, which may be defined by a distance between the first tower <NUM> and the second tower <NUM>, may be constant in the vertical direction. Alternatively, the width of the blowing space S may increase or decrease in the vertical direction.

Air flowing to a front of the blowing space S may be evenly distributed in the vertical direction by making the width of the blowing space S constant along the vertical direction.

If a width of an upper side of the blowing space S differs from the width of a lower side of the blowing space S, a flow speed at the wider side may be lower than at the narrower side, and a deviation of speed may occur in the vertical direction. When a deviation of air flow speed occurs in the vertical direction, an amount of clean air supplied may vary according to a vertical position from which the air is discharged.

Air discharged from each of the first discharge port <NUM> and the second discharge port <NUM> may be supplied to a user after being joined in the blowing space S.

The air discharged from the first discharge port <NUM> and the air discharged from the second discharge port <NUM> may not flow individually to the user, but may be supplied to the user after combining or mixing in the blowing space S.

An indirect airflow may be formed in the air around the blower <NUM> due to air discharged to the blowing space S such that the air around the blower <NUM> may also flow toward the blowing space S.

Since the discharged air of the first discharge port <NUM> and the discharged air of the second discharge port <NUM> are joined in the blowing space S, a straightness or steadiness of the joined discharged air may be improved. By joining the discharged air in the blowing space S, the air around the first tower <NUM> and the second tower <NUM> may also be induced to flow forward along an outer circumferential surface of the blowing module <NUM>.

The first tower case <NUM> may include a first tower upper end 221a forming an upper surface of the first tower <NUM>, a first tower front end 221b forming a front surface of the first tower <NUM>, a first tower rear end 221c forming a rear surface of the first tower <NUM>, a first outer wall 221d forming an outer circumferential surface of the first tower <NUM>, and a first inner wall 221e forming an inner surface of the first tower <NUM> facing the blowing space S.

Similarly, the second tower case <NUM> may include a second tower upper end 231a forming an upper surface of the second tower <NUM>, a second tower front end 231b forming a front surface of the second tower <NUM>, a second tower rear end 231c forming a rear surface of the second tower <NUM>, a second outer wall 231d forming an outer circumferential surface of the second tower <NUM>, and a second inner wall 231e forming an inner surface of the second tower <NUM> facing the blowing space S.

The first outer wall 221d and the second outer wall 231d may be formed to curve convexly outward in ta radial direction so that outer circumferential surfaces of each of the first tower <NUM> and the second tower <NUM> are curved.

The first inner wall 221e and the second inner wall 231e may be formed to curve convex inward toward the blowing space S in the radial direction so inner circumferential surfaces of each of the first tower <NUM> and the second tower <NUM> are curved.

The first discharge port <NUM> may be formed in the first inner wall 221e and extend in the vertical direction. The first discharge port <NUM> may be opened inward in the radial direction. The second discharge port <NUM> may be formed in the second inner wall 231e and extend in the vertical direction. The second discharge port <NUM> may be opened inward in the radial direction.

The first discharge port <NUM> may be positioned closer to the first tower rear end 221c than the first tower front end 221b. The second discharge port <NUM> may be positioned closer to the second tower rear end 231c than the second tower front end 231b.

A first board slit <NUM> may be formed in the first inner wall 221e to extend vertically. A second board slit <NUM> may be formed in the second inner wall 231e to extend vertically. The first board slit <NUM> and the second board slit <NUM> may be formed to be opened inward in the radial direction. A first airflow converter <NUM> (<FIG>) described later may pass through the first board slit <NUM> and a second airflow converter <NUM> (<FIG>) described later may pass through the second board slit <NUM>.

The first board slit <NUM> may be positioned closer to the first tower front end 221b than the first tower rear end 221c. The second board slit <NUM> may be positioned closer to the second tower front end 231b than the second tower rear end 231c. The first board slit <NUM> and the second board slit <NUM> may face each other.

Hereinafter, an internal structure of the blower <NUM> will be described with reference to <FIG> and <FIG>. <FIG> is a cross-sectional view of the blower <NUM> cut along the line P-P' shown in <FIG>, and <FIG> is a cross-sectional view showing the blower <NUM> along the line Q-Q' shown in <FIG>.

Referring to <FIG>, a substrate assembly or controller <NUM> (e.g., printed circuit board or PCB assembly) to control an operation of a fan assembly <NUM> may be provided in an upper side of the base <NUM>. A control space <NUM> in which the substrate assembly <NUM> is provided may be formed in the upper side of the base <NUM>.

The filter <NUM> may be provided above the control space <NUM>. The filter <NUM> may have a hollow cylindrical shape, and a cylindrical filter hole <NUM> or hollow opening may be formed inside the filter <NUM>.

Air introduced through the suction port <NUM> may pass through the filter <NUM> and flow to the filter hole <NUM>.

A suction grill <NUM> may be provided above the filter <NUM>. Air flowing upward through the filter <NUM> may pass through the suction grill <NUM>. The suction grill <NUM> may be provided between the fan assembly <NUM> and the filter <NUM>. When the lower case <NUM> is removed and the filter <NUM> is separated from the blower <NUM>, the suction grill <NUM> may prevent a user's hand from contacting the fan assembly <NUM>.

The fan assembly <NUM> may be provided in the upper side of the filter <NUM> and may generate a suction force for air outside the blower <NUM>.

By driving the fan assembly <NUM>, ambient air outside the blower <NUM> may be suctioned through the suction port <NUM> and the filter hole <NUM> sequentially to flow to the first tower <NUM> and the second tower <NUM>.

A pressurizing space <NUM> in which the fan assembly <NUM> is provided may be formed between the filter <NUM> and the blowing module <NUM>.

A first distribution space <NUM> may be formed inside the first tower <NUM>, and a second distribution space <NUM> may be formed inside the second tower <NUM>. Air that passes through the pressurizing space <NUM> may flow upward through the first or second distribution spaces <NUM> or <NUM>. The tower base <NUM> may distribute the air that passed through the pressurizing space <NUM> into the first distribution space <NUM> and the second distribution space <NUM>. The tower base <NUM> may form a channel connecting the first and second towers <NUM> and <NUM> and the fan assembly <NUM>.

The first distribution space <NUM> may be formed between the first outer wall 221d and the first inner wall 221e. The second distribution space <NUM> may be formed between the second outer wall 231d and the second inner wall 231e.

The first tower <NUM> may include a first flow guide or air guide <NUM> that guides a flow direction of the air inside the first distribution space <NUM>. A plurality of first flow guides <NUM> may be provided to be spaced apart from each other vertically.

The first flow guide <NUM> may be formed to protrude from the first tower rear end 221c toward the first tower front end 221b. The first flow guide <NUM> may be spaced apart from the first tower front end 221b in the front-rear direction. The first flow guide <NUM> may extend obliquely downward while progressing toward the front. An angle at which each of the plurality of first flow guides <NUM> is inclined downward may decrease as the first flow guide <NUM> progresses upward.

The second tower <NUM> may include a second flow guide or air guide <NUM> that guides a flow direction of the air inside the second distribution space <NUM>. A plurality of second flow guides <NUM> may be provided to be spaced apart from each other vertically.

The second flow guide <NUM> may be formed to protrude from the second tower rear end 231c toward the second tower front end 231b. The second flow guide <NUM> may be spaced apart from the second tower front end 231b in the front-rear direction. The second flow guide <NUM> may extend obliquely downward while progressing toward the front. An angle at which each of the plurality of second flow guides <NUM> is inclined downward may decrease as the second flow guide <NUM> progresses upward.

The first flow guide <NUM> may guide the air discharged from the fan assembly <NUM> to flow toward the first discharge port <NUM>. The second flow guide <NUM> may guide the air discharged from the fan assembly <NUM> to flow toward the second discharge port <NUM>.

Referring to <FIG>, the fan assembly <NUM> may include a fan motor <NUM> which generates power, a motor housing <NUM> which receives the fan motor <NUM>, a fan <NUM> which is rotated by receiving power from the fan motor <NUM>, and a diffuser <NUM> which guides the flow direction of the air pressurized by the fan <NUM>.

The fan motor <NUM> may be provided at an upper side of the fan <NUM> and may be connected to the fan <NUM> through a motor shaft <NUM> extending downward from the fan motor <NUM>.

The motor housing <NUM> may include a first or upper motor housing <NUM> covering an upper portion of the fan motor <NUM> and a second or lower motor housing <NUM> covering a lower portion of the fan motor <NUM>.

The first discharge port <NUM> is provided in the upper side of the tower base <NUM>. A first discharge port lower end 222d may join with or be provided in the upper side of the tower base upper surface <NUM>.

The first discharge port <NUM> may spaced apart from the lower side of the first tower upper end 221a. A first discharge port upper end 222c may be formed to be spaced apart from the lower side of the first tower upper end 221a.

The first discharge port <NUM> may obliquely extend in the vertical direction to be inclined. The first discharge port <NUM> may be inclined forward while progressing upward. The first discharge port <NUM> may obliquely extend rearward with respect to a vertical axis Z extending in the vertical direction.

A first discharge port front end 222a and a first discharge port rear end 222b may extend obliquely in the vertical direction, and may extend parallel to each other. The first discharge port front end 222a and the first discharge port rear end 222b may be inclined rearward with respect to the vertical axis Z extending in the vertical direction.

The first tower <NUM> may include a first discharge guide <NUM> to guide the air inside the first distribution space <NUM> to the first discharge port <NUM>.

The first tower <NUM> may be symmetrical with the second tower <NUM> with respect to the blowing space S, and may have the same shape and structure as the second tower <NUM>. The description of the first tower <NUM> described above may be identically applied to the second tower <NUM>.

Hereinafter, an air discharge structure of the blower <NUM> for inducing a Coanda effect will be described with reference to <FIG> and <FIG>. <FIG> shows a form in which the blower <NUM> is viewed from the top to the bottom, and <FIG> shows a form in which the blower <NUM> is cut along the R-R' diagram shown in <FIG> and viewed upward.

Referring to <FIG>, due to the convex curvatures of the first and second inner walls 221e and <NUM>, a distance between the first inner wall 221e and the second inner wall 231e may decrease while approaching a closer of the blowing space S.

The first inner wall 221e and the second inner wall 231e may be formed to be convex toward the radial inner side, and a shortest or center distance D0 may be formed between the vertices or centers of the first inner wall 221e and the second inner wall 231e. The shortest distance D0 may be formed in the center of the blowing space S.

The first and second discharge ports <NUM> and <NUM> may be formed behind a position where the shortest distance D0 is formed.

The first tower front end 221b and the second tower front end 231b may be spaced apart by a first or front distance D1. The first tower rear end 221c and the second tower rear end 231c may be spaced apart by a second or rear distance D2.

The first distance D1 and the second distance D2 may be the same, but embodiments disclosed herein are not limited. The first distance D1 may be greater than the shortest distance D0, and the second distance D2 may be greater than the shortest distance D0.

The distance between the first inner wall 221e and the second inner wall 231e may be decreased from the rear ends 221c, 231c to a position where the shortest distance D0 is formed, and may be increased from a position where the shortest distance D0 is formed to the front ends 221b, 231b.

The first tower front end 221b and the second tower front end 231b may be formed to be inclined or curved with respect to a front-rear axis X.

Tangent lines drawn at each of the first and second tower front ends 221b and 231b may have a certain inclination angle A with respect to the front-rear axis X.

Some of the air discharged forward through the blowing space S may flow with the inclination angle A with respect to the front-rear axis X.

Due to this curved structure of the first and second inner walls 221e and 231e, the diffusion angle of the air discharged forward through the blowing space S may be increased.

A first airflow converter <NUM> described later may be brought into the first board slit <NUM> when air is discharged forward through the blowing space S.

A second airflow converter <NUM> described later may be brought into the second board slit <NUM> when air is discharged forward through the blowing space S.

Referring to <FIG>, air discharged toward the blowing space S may be guided in a flow direction by the first discharge guide <NUM> and the second discharge guide <NUM>.

The first discharge guide <NUM> may include a first inner guide 225a connected to the first inner wall 221e and a first outer guide 225b connected to the first outer wall 221d.

The first inner guide 225a may be manufactured integrally with the first inner wall 221e, or alternatively may be manufactured separately and later combined.

The first outer guide 225b may be manufactured integrally with the first outer wall 221d, or alternatively may be manufactured separately and later combined.

The first inner guide 225a may be formed to protrude from the first inner wall 221e toward the first distribution space <NUM>.

The first outer guide 225b may be formed to protrude from the first outer wall 221d toward the first distribution space <NUM>. The first outer guide 225b may be formed to be spaced apart from the first inner guide 225a and may form the first discharge port <NUM> between the first inner guide 225a and the first outer guide 225b.

A radius of curvature of the first inner guide 225a may be less than a radius of curvature of the first outer guide 225b.

The air in the first distribution space <NUM> may flow between the first inner guide 225a and the first outer guide 225b, and may flow into the blowing space S through the first discharge port <NUM>.

The second discharge guide <NUM> may include a second inner guide 235a connected to the second inner wall 231e and a second outer guide 235b connected to the second outer wall 231d.

The second inner guide 235a may be manufactured integrally with the second inner wall 231e, or alternatively may be manufactured separately and later combined.

The second outer guide 235b may be manufactured integrally with the second outer wall 231d, or alternatively may be manufactured separately and later combined.

The second inner guide 235a may be formed to protrude from the second inner wall 231e toward the second distribution space <NUM>.

The second outer guide 235b may be formed to protrude from the second outer wall 231d toward the second distribution space <NUM>. The second outer guide 235b may be formed to be spaced apart from the second inner guide 235a and may form a second discharge port <NUM> between the second inner guide 235a and the second outer guide 235b.

A radius of curvature of the second inner guide 235a may be smaller than a radius of curvature of the second outer guide 235b.

The air in the second distribution space <NUM> may flow between the second inner guide 235a and the second outer guide 235b and flow into the blowing space S through the second discharge port <NUM>.

A width of the first discharge port <NUM> may be formed to gradually decrease and then increase as it progresses from an inlet of the first discharge guide <NUM>, which may be an inlet 222i of the first discharge port <NUM>, toward an outlet of the first discharge guide <NUM>, which may be an outlet 222o of the first discharge port <NUM>.

An inlet width w1 of the inlet 222i may be larger than an outlet width w3 of the outlet 222o.

The inlet 222i of the first discharge port <NUM> may have an inlet width w1. The outlet 222o of the first discharge port <NUM> may have an outlet width w3. The inlet 222i of the first discharge port <NUM> may be located behind the outlet 222o. The air introduced into the first discharge port <NUM> may flow forward as it goes from the inlet 222i to the outlet 222o.

The inlet width w1 may be defined as a distance between an outer end of the first inner guide 225a and an outer end of the first outer guide 225b. The outlet width w3 may be defined as a distance between the first discharge port front end 222a, which is an inner end of the first inner guide 225a, and the first discharge port rear end 222b, which is an inner end of the first outer guide 225b.

The inlet width w1 and the outlet width w3 may each be larger than a shortest or inner width w2 of the first discharge port <NUM>.

The shortest width w2 may be defined as the shortest distance between the first discharge port rear end 222b and the first inner guide 225a.

The width of the first discharge port <NUM> may gradually decrease from the inlet of the first discharge guide <NUM> to a position where the shortest width w2 is formed, and may gradually increase from a position where the shortest width w2 is formed to the outlet of the first discharge guide <NUM>.

Similar to the first discharge guide <NUM>, the second discharge guide <NUM> may have a second discharge port front end 232a and a second discharge port rear end 232b. The second discharge guide <NUM> may have a same width distribution or configuration as the first discharge guide <NUM>.

The air discharged to the blowing space S through the first discharge port <NUM> may flow forward along an inner surface of the first inner wall 221e due to the Coanda effect. The air discharged to the blowing space S through the second discharge port <NUM> may flow forward along an inner surface of the second inner wall 231e due to the Coanda effect.

Hereinafter, a wind direction change by an air flow converter <NUM> will be described with reference to <FIG> and <FIG>. <FIG> is a diagram illustrating a form in which the airflow converter <NUM> protrudes into the blowing space S so that the blower <NUM> forms an upward airflow, and <FIG> is a diagram illustrating the operating principle of the airflow converter <NUM>.

Referring to <FIG>, the airflow converter <NUM> may protrude toward the blowing space S and may convert the flow of air discharged forward through the blowing space S into a rising wind.

The airflow converter <NUM> may include a first airflow converter <NUM> provided at the first tower case <NUM> and a second airflow converter <NUM> provided at the second tower case <NUM>.

The first airflow converter <NUM> and the second airflow converter <NUM> be coupled to (e.g., inserted in) and protrude from each of the first tower <NUM> and the second tower <NUM> toward the blowing space S to block a front of the blowing space S.

When the first airflow converter <NUM> and the second airflow converter <NUM> protrude to block the front of the blowing space S, the air discharged through the first discharge port <NUM> and the second discharge port <NUM> may flow upward in the Z direction.

The first and second airflow converters <NUM> and <NUM> may be configured be inserted or pulled to an inside of the first and second towers <NUM> and <NUM>, respectively, via the first and second board slits <NUM> and <NUM>. When the first airflow converter <NUM> and the second airflow converter <NUM> are respectively brought or pulled into the first tower <NUM> and the second tower <NUM> to open the front of the blowing space S, the air discharged through the first discharge port <NUM> and the second discharge port <NUM> may flow forward X through the blowing space S. As an alternative, the first and second airflow converts <NUM> and <NUM> may be configured to be removable from the first and second board slits <NUM> and <NUM> (e.g., by lifting or pulling). As another alternative, the first and second air flow converters <NUM> and <NUM> may be removably coupled to the inner walls 221e and 231e of the first and second tower cases <NUM> and <NUM>.

Referring to <FIG>, the first and second airflow converters <NUM> and <NUM> may each include a board <NUM> protruding toward the blowing space S, a motor <NUM> providing driving force to the board <NUM> to move the board <NUM>, a board guide <NUM> to guide a moving direction of the board <NUM>, and a cover <NUM> to support the motor <NUM> and the board guide <NUM>.

Hereinafter, the first airflow converter <NUM> will be described as an example, but the description of the first airflow converter <NUM> described below may be identically applied to the second airflow converter <NUM>.

The board <NUM> may be brought into the first board slit <NUM> as shown in <FIG> and <FIG>. When the motor <NUM> is driven, the board <NUM> may protrude into the blowing space S through the first board slit <NUM>. The board <NUM> may be curved to have an arc shape. When the motor <NUM> is driven, the board <NUM> may be moved in a curved or circumferential direction to protrude into the blowing space S.

The motor <NUM> may be connected to a pinion gear <NUM> to rotate the pinion gear <NUM>. The motor <NUM> may rotate the pinion gear <NUM> clockwise or counterclockwise.

The board guide <NUM> may have a plate shape extending vertically. The board guide <NUM> may include a guide slit <NUM> which is inclined upward in a rightward direction (or alternatively, leftward direction), based on <FIG>. The board guide may include a rack <NUM> formed to protrude toward and engage with the pinion gear <NUM>.

When the motor <NUM> is driven and the pinion gear <NUM> is rotated, the rack <NUM> engaged with the pinion gear <NUM> may be moved vertically.

A guide protrusion or knob <NUM> may be formed in the board <NUM> to protrude toward the board guide <NUM>. The guide protrusion <NUM> may be inserted into the guide slit <NUM>.

When the board guide <NUM> is moved vertically according to the vertical movement of the rack <NUM>, the guide protrusion <NUM> may be moved by an edge of the board guide <NUM> defining the guide slit <NUM> pressing against the guide protrusion <NUM>. According to the vertical movement of the board guide <NUM>, the guide protrusion <NUM> may be moved diagonally within the guide slit <NUM>.

When the rack <NUM> is moved upward, the guide protrusion <NUM> may be moved along the guide slit <NUM> to be positioned in a lowermost end (also a leftmost end in <FIG>) of the guide slit <NUM>. When the guide protrusion <NUM> is positioned in the lowermost end of the guide slit <NUM>, the board <NUM> may be completely concealed within the first tower <NUM> as shown in <FIG> and <FIG>. When the rack <NUM> is moved upward, the guide slit <NUM> is also moved upward. Accordingly, the guide protrusion <NUM> may be moved in the circumferential direction on a same horizontal plane along the guide slit <NUM>.

When the rack <NUM> is moved downward, the guide protrusion <NUM> may be moved along the guide slit <NUM> to be positioned in an uppermost end (also a rightmost end in <FIG>) of the guide slit <NUM>. When the guide protrusion <NUM> is positioned in the uppermost end of the guide slit <NUM>, the board <NUM> may protrude from the first tower <NUM> toward the blowing space S as shown in <FIG>. When the rack <NUM> is moved downward, the guide slit <NUM> is also moved downward. Accordingly, the guide protrusion <NUM> may be moved in the circumferential direction on the same horizontal plane along the guide slit <NUM>.

The cover <NUM> may include a first cover <NUM> provided outside the board guide <NUM>, a second cover <NUM> provided inside the board guide <NUM> and contacting the first inner surface 221e, a motor support plate <NUM> extended upward from the first cover <NUM> and connected to the motor <NUM>, and a stopper <NUM> to limit the vertical movement of the board guide <NUM>.

The first cover <NUM> may cover an outside of the board guide <NUM>, and the second cover <NUM> may cover an inside of the board guide <NUM>. The first cover <NUM> may separate a space in which the board guide <NUM> is provided from the first distribution space <NUM>. The second cover <NUM> may prevent the board guide <NUM> from contacting the first inner wall 221e.

The motor support plate <NUM> may extend upward from the first cover <NUM> to support the load of the motor <NUM>.

The stopper <NUM> may be formed to protrude toward the board guide <NUM> from the first cover <NUM>. A locking protrusion may be formed on a surface of the board guide <NUM>, and the locking protrusion may be configured to be caught by the stopper <NUM> according to the vertical movement of the board guide <NUM>. When the board guide <NUM> is moved vertically, the locking protrusion may be caught by the stopper <NUM> so that a vertical movement of the board guide <NUM> may be restricted.

Hereinafter, the arrangement of the flow guide <NUM> will be described with reference to <FIG> shows the internal structure of the second tower <NUM> and the tower base <NUM> by cutting a part of the blower <NUM> shown in <FIG>.

The flow guide <NUM> may include a first flow guide <NUM> disposed at the first tower <NUM> and a second flow guide <NUM> disposed at the second tower <NUM>. The first flow guide <NUM> and the second flow guide <NUM> may have the same structure and may be symmetrical with respect to the blowing space S. The description of the second flow guide <NUM> described below may be equally applied to the first flow guide <NUM>.

The fan assembly <NUM> may introduce air outside the blower <NUM> into the lower case <NUM> through the suction hole <NUM>. Air introduced into the lower case <NUM> may flow into the pressurized space <NUM> through the filter hole <NUM>. The lower case <NUM> may include a case door <NUM>, and the case door <NUM> may be detachable from the lower case <NUM>. When the case door <NUM> is separated from the lower case <NUM>, the filter <NUM> may be placed in a state capable of being withdrawn from the inside of the case.

Air introduced into the pressurized space <NUM> by the fan assembly <NUM> may flow into the second tower <NUM> through the second distribution space <NUM>. Air introduced into the second tower <NUM> may flow upward and a flow direction may be guided by the second flow guide <NUM>.

The second flow guide <NUM> may be disposed above the fan assembly <NUM> and may be disposed inside the second distribution space <NUM>.

The plurality of second flow guides <NUM> may be spaced vertically from each other. The number of second flow guides <NUM> is not limited, but two, three, four, five or more may be disposed.

The second flow guide <NUM> may extend in a horizontal direction from the rear end of the second tower 231c toward the front end of the second tower 231b. The guide rear end <NUM> of the second flow guide <NUM> may be connected to the rear end of the second tower 231c. The guide front end <NUM> of the second flow guide <NUM> may be spaced apart from the rear of the front end of the second tower 231b.

The second flow guide <NUM> may have a plate shape extending in a horizontal direction and may have a curved shape. The guide inner end <NUM> of the second flow guide <NUM> may be in close contact with or connected to the second inner wall 231e. The guide outer end <NUM> of the second flow guide <NUM> may be in close contact with or connected to the second outer wall 231d. The second flow guide <NUM> may have a curved plate shape extending between the second inner wall 231e and the second outer wall 231d.

Hereinafter, the structure of the flow guide <NUM> will be described in detail with reference to <FIG> shows a form of the blower <NUM> shown in <FIG> viewed from the side.

Hereinafter, for convenience of explanation, the flow guide <NUM> is described by taking the second flow guide <NUM> as an example, but the description of the second flow guide <NUM> can be applied equally to the first flow guide <NUM>.

The second flow guide <NUM> may be disposed closer to the rear end of the second tower 231c than the front end of the second tower 231b. The guide front end <NUM> may be spaced apart from the rear of the second tower front end 231b, and the guide rear end <NUM> may be spaced apart from the front of the second tower rear end 231c.

The second flow guide <NUM> may be fixed to the second tower case <NUM> by coupling the guide rear end <NUM> to the rear end of the second tower 231c. The guide inner end <NUM> and the guide outer end <NUM> are coupled to the second inner wall 231e and the second outer wall 231d, respectively, so that the second flow guide <NUM> can be fixed to the second tower case <NUM>.

A plurality of flow guides <NUM> may be arranged to be spaced apart in the vertical direction. The flow guides <NUM>, <NUM>, <NUM> include a first guide 530a, a second guide 530b disposed above the first guide 530a, a third guide 530c disposed above the second guide 530b, and a fourth guide 530d disposed above the third guide 530c.

The first guide 530a may mean a flow guide <NUM> disposed at the bottom of the plurality of flow guides <NUM>. A lower surface of the first guide 530a may face the fan assembly <NUM>, and an upper surface of the first guide 530a may face a lower surface of the second guide 530b.

The second guide 530b may mean a flow guide <NUM> disposed adjacent to the first guide 530a among the plurality of flow guides <NUM>. A lower surface of the second guide 530b may face an upper surface of the first guide 530a, and an upper surface of the second guide 530b may face a lower surface of the third guide 530c.

The third guide 530c may mean a flow guide <NUM> disposed adjacent to the fourth guide 530d among the plurality of flow guides <NUM>. A lower surface of the third guide 530c may face an upper surface of the second guide 530b, and an upper surface of the third guide 530c may face a lower surface of the fourth guide 530d.

The fourth guide 530d may mean a flow guide <NUM> disposed at the top of the plurality of flow guides <NUM>. A lower surface of the fourth guide 530d may face an upper surface of the third guide 530c, and an upper surface of the fourth guide 530d may face the upper end of the second tower 231a.

The second guide 530b and the third guide 530c may mean a flow guide <NUM> disposed between the first guide 530a and the fourth guide 530d.

The flow guide <NUM> may be formed to be curved. Some of the plurality of flow guides <NUM> may be formed to be convex upward. Some of the plurality of flow guides <NUM> may extend inclined upward. Some of the plurality of flow guides <NUM> may be formed in a flat plate shape. Some of the plurality of flow guides <NUM> may be formed to be bent downward.

The first guide 530a may be formed to be bent downward as it goes to the front side. The guide front end 531a of the first guide 530a may be positioned below the guide rear end 532a. The first guide 530a may extend horizontally from the rear end of the tower 231c toward the front side, and may bend downward as it goes to the front side. The tangent line at the guide front end 531a of the first guide 530a may have an inclination angle θ1 downward with respect to the horizontal direction.

The second guide 530b may be formed to be convex upward. The second guide 530b may be curved forward from the rear end of the tower 231c, and may have a shape that is convex upward. The guide front end 531b of the second guide 530b may be positioned below the guide rear end 532b. The tangent line at the guide front end 531b of the second guide 530b may have an inclination angle θ2 downward with respect to the horizontal direction. The tangent line at the rear guide end 532b of the second guide 530b may have an inclination angle α1 downward with respect to the horizontal direction.

The third guide 530c may be formed to be convex upward. The third guide 530c may be curved forward from the rear end of the tower 231c, and may have a shape that is convex upward. The guide front end 531c of the third guide 530c may be positioned above the guide rear end 532c. The tangent line at the guide front end 531c of the third guide 530c may have an inclination angle θ3 downward with respect to the horizontal direction. The tangent line at the guide rear end 532c of the third guide 530c may have an inclination angle α2 downward with respect to the horizontal direction.

The fourth guide 530d may extend obliquely upward. The fourth guide 530d may extend toward the front side from the rear end of the tower 231c, and may have a flat plate shape. The guide front end 531d of the fourth guide 530d may be positioned above the guide rear end 532d. An upper and a lower surface of the fourth guide 530d may have an upward inclination angle θ4 with respect to the horizontal direction. The inclination angle θ4 of the fourth guide 530d may be kept constant in the front-rear direction.

A distance between each of the plurality of flow guides 530a, 530b, 530c, and 530d and the front end of the tower 231b may be formed to be different from each other.

The first guide 530a may be spaced apart from the front end of the tower 231b by a first gap G1. The second guide 530b may be spaced apart from the front end of the tower 231b by a second gap G2. The third guide 530c may be spaced apart from the front end of the tower 231b by a third gap G3. The fourth guide 530d may be spaced apart from the front end of the tower 231b by a fourth gap G4.

The gaps G1, G2, G3, and G4 between the plurality of flow guides <NUM> and the front end of the tower 231b may be wider as they are disposed at the lower side. The first gap G1 may be wider than the second gap G2, the second gap G2 may be wider than the third gap G3, and the third gap G3 is greater than the fourth gap G4.

The front end of the second tower 231b may extend obliquely with respect to the vertical direction. The front end of the second tower 231b may be obliquely extended rearward as it goes upward. The front end of the second tower 231b may be closer to the vertical axis Z located at the center as it goes upward. The front end of the second tower 231b may have an inclination angle β1 to the rear with respect to the vertical direction.

The rear end of the second tower 231c may extend obliquely with respect to the vertical direction. The rear end of the second tower 231c may be obliquely extended forward as it goes upward. The rear end of the second tower 231c may be closer to the vertical axis Z located at the center as it goes upward. The rear end of the second tower 231c may have a forward inclination angle β2 with respect to the vertical direction.

The second discharge port <NUM> may extend obliquely with respect to the vertical direction. The second discharge port <NUM> may be obliquely extended forward as it goes upward. The second discharge port <NUM> may be closer to the vertical axis Z located at the center as it goes upward. The second discharge port <NUM> may extend parallel to the rear end of the second tower 231c. The front end of the second discharge port 232a and the rear end of the second discharge port 232b may extend in a parallel direction.

The front end of the tower 231b, the rear end of the tower 231c and the discharge port <NUM> are formed to be inclined, and the gaps G1, G2, G3 and G4 between the flow guide <NUM> and the front end of the tower 231b become narrower toward the upper side. Therefore, the air blown by the fan <NUM> may be smoothly guided to the discharge port <NUM> by the flow guide <NUM>. In addition, because the front end of the tower 231b, the rear end of the tower 231c and the discharge port <NUM> are formed to be inclined, and the gaps G1, G2, G3 and G4 between the flow guide <NUM> and the front end of the tower 231b become narrower toward the upper side, the air discharged through the discharge port <NUM> may be evenly distributed in a vertical direction.

In more detail, the air blown by the fan <NUM> has a higher pressure as it is closer to the fan <NUM> and has a lower pressure as it is further away from the fan <NUM>. Thus, by forming a wide gap between the flow guide <NUM> located close to the fan <NUM> and the front end of the tower 231b, it induces more air of a flow rate to diffuse upward, and prevents the phenomenon that the air discharged through the discharge port is concentrated in the lower part. In addition, by forming a narrow gap between the flow guide <NUM> located far from the fan <NUM> and the front end of the tower 231b, it induces that the air whose flow rate is reduced while flowing upward is not separated and guided to the discharge port by the flow guide.

Hereinafter, a structure of the flow guide <NUM> in a blower <NUM>'according to another embodiment will be described with reference to <FIG> is a longitudinal sectional perspective view of a blower <NUM>' according to another embodiment.

In the blower <NUM>' according to another embodiment, the heater <NUM> is disposed inside the upper cases <NUM> and <NUM>. The heater <NUM> may be disposed inside the first tower <NUM> and the second tower <NUM>, respectively. A first heater <NUM> may be disposed inside the first tower <NUM>, and a second heater (not shown) may be disposed inside the second tower <NUM>. The structure and arrangement of the heater <NUM> is described by taking the first heater <NUM> as an example, but the description of the first heater <NUM> is equally applied to the second heater (not shown).

A flow guide <NUM> is disposed inside the blower <NUM>'. A plurality of flow guides <NUM> may be arranged to be spaced apart in a vertical direction. The flow guide <NUM> may include a first guide 620a, a second guide 620b, a third guide 620c, and a fourth guide 620d, and the shape and structure of the flow guide <NUM> may be the same as the flow guide <NUM> according to the embodiment described above.

The heater <NUM> may include a first heat dissipation tube <NUM> extending in a vertical direction, a second heat dissipation tube <NUM> extending in a vertical direction and spaced apart from the first heat dissipation tube <NUM>, a corner <NUM> connecting the first heat dissipation tube <NUM> and the second heat dissipation tube <NUM>, a holder <NUM> fixing the first heat dissipation tube <NUM> and the second heat dissipation tube <NUM>, and a plurality of radiating fins <NUM> through which the first heat dissipation tube <NUM> and the second heat dissipation tube <NUM> pass.

The first heat dissipation tube <NUM>, the second heat dissipation tube <NUM>, and the corner <NUM> may be integral pipes, and may be fixed by the holder <NUM>.

The plurality of radiating fins <NUM> may extend in a front-rear direction. The plurality of radiating fins <NUM> may be spaced apart from each other in a vertical direction. A heating passage <NUM> through which air passes may be formed between the plurality of radiating fins <NUM>. The heating passage <NUM> may be understood as an air flow passage extending in the front-rear direction between the plurality of radiating fins <NUM>.

Each of the plurality of flow guides <NUM> may extend in the front-rear direction from the rear end of the tower 221c toward the front end of the tower 221b. The air passing through the heating passage <NUM> may be guided by the flow guide <NUM> and discharged to the blowing space S through the discharge port <NUM>.

The flow guide <NUM> may be disposed parallel to a flow direction of the air passing through the heating passage <NUM>. The guide front ends 621a, 621b, 621c, 621d of the flow guide <NUM> may face the heating passage <NUM>. The flow guide <NUM> may be extended in a streamlined form from the guide front end 621a, 621b, 621c and 621d to the guide rear end 622a, 622b, 622c and 622d in parallel with a flow direction of the air passing through the heating passage <NUM>. The guide front ends 621a, 621b, 621c and 621d of the flow guide <NUM> may be spaced apart from the radiating fin <NUM>.

Air blown by the fan <NUM> and introduced into the tower cases <NUM> and <NUM> flows upward. The air flowing upward flows backwards toward the discharge ports <NUM> and <NUM> while passing through the heating passage <NUM> formed between the radiating fins <NUM>. The air that has passed through the heating passage <NUM> is guided by the flow guide <NUM> and is discharged to the blowing space S through the discharge ports <NUM> and <NUM>. Accordingly, the air that is introduced into the towers <NUM> and <NUM> and flows upward can be smoothly discharged to the discharge port by being guided by the heater and flow guide.

Hereinafter, a structure of a flow guide <NUM> of a blower <NUM>" according to the present invention and an effect thereof will be described with reference to <FIG>. <FIG> is a longitudinal sectional perspective view of a blower <NUM>" according to another embodiment of the present invention, and <FIG> are graphs showing the effect of the flow guide <NUM>.

Referring to <FIG>, a third discharge port <NUM> opened in a vertical direction is formed at the tower base <NUM>, in particular on the top surface <NUM> of the tower base <NUM>.

A flow guide <NUM> for guiding air is disposed in the third discharge port <NUM>. The third discharge port <NUM> may be formed at a concave portion of the top surface <NUM> of the tower base <NUM>.

The flow guide <NUM> may be disposed to be inclined with respect to the vertical direction. The guide upper end 212a of the flow guide <NUM> may be located ahead of the guide lower end 212b. The flow guide <NUM> may be connected to the tower base <NUM>.

A plurality of flow guides <NUM> may be arranged to be spaced apart in a front-rear direction. A plurality of third discharge ports <NUM> may be formed between the plurality of flow guides <NUM>, respectively.

The flow guide <NUM> may be disposed between the first tower <NUM> and the second tower <NUM>, and may be disposed under the blowing space S. The air blown from the fan <NUM> may be guided by the flow guide <NUM> and discharged to the blowing space S through the third discharge port <NUM>.

The structure of the third discharge port <NUM> and the flow guide <NUM> according to the embodiment described above is applicable to the blower <NUM> according to the first embodiment and the blower <NUM>'according to the second embodiment. The flow guide <NUM> is referred to as a guide vane <NUM>.

The slope of the flow guide <NUM> with respect to the vertical direction is defined as the flow guide angle (C).

<FIG> is a graph showing the measured value of the flow rate change according to the flow guide angle (C) measured at a point (P) <NUM> in front of the upper end of the tower 221a. The change in flow velocity according to the flow guide angle (C) was measured while changing the number of flow guides <NUM>. When the number of flow guides <NUM> is <NUM> or more, if the flow guide angle C is less than <NUM> degrees, it can be seen that the flow velocity at the point P converges to zero. When the number of flow guides <NUM> is two, it can be seen that even if the flow guide angle C is reduced, air flow from the point P to the front is formed.

<FIG> is a graph showing the measured value of the airflow at an upper side of the tower <NUM>. When the number of flow guides <NUM> is <NUM>, <NUM>, and <NUM>, it can be seen that airflow is formed above the tower <NUM>. In addition, when the number of flow guides <NUM> is <NUM> or <NUM>, it can be seen that the flow velocity decreases as the flow guide angle C increases.

Refering to <FIG>, it can be seen that when at least four flow guides <NUM> are disposed, it is possible to minimize the flow in the forward direction and form an upward air flow.

According to the blower of the embodiments described above, one or more of the following effects are provided.

First, the air blown upward by the fan is guided to the discharge port by the flow guide, so that air is evenly distributed in the vertical direction through the discharge port.

Second, by adjusting the distance between the flow guide and the upper case, there is also an advantage in that the flow rate can be evenly distributed according to the distance spaced from the fan.

Third, there is an advantage of reducing flow resistance and noise by making the shape of the plurality of flow guides different according to the arrangement position.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the claims.

Claim 1:
A blower (<NUM>; <NUM>'; <NUM>") comprising:
a lower case (<NUM>) having a suction port (<NUM>);
a fan (<NUM>) disposed inside the lower case (<NUM>);
an upper case (<NUM>, <NUM>) disposed above the lower case (<NUM>) and having an inner space through which air propelled from the fan (<NUM>) flows;
a discharge port (<NUM>, <NUM>) penetrating the upper case (<NUM>, <NUM>) and formed to be elongated; and
a flow guide (<NUM>; <NUM>) disposed in the inner space and extending in a direction crossing a longitudinal direction of the discharge port (<NUM>, <NUM>),
wherein the upper case (<NUM>, <NUM>) comprises:
a tower base (<NUM>) connected to the lower case (<NUM>);
a first tower (<NUM>) extending upward from the tower base (<NUM>) and having a first discharge port (<NUM>);
a second tower (<NUM>) extending upward from the tower base (<NUM>), having a second discharge port (<NUM>);
a blowing space (S) formed between the first tower (<NUM>) and the second tower (<NUM>);
characterized by
a third discharge port (<NUM>) formed at the tower base (<NUM>) and opened in a vertical direction; and
a guide vane (<NUM>) disposed at the third discharge port (<NUM>).