KR102333202B1 - Air Blower and Air Purifier Including the Same - Google Patents

Abstract

A blower of improved efficiency and an air purifier including the same are disclosed. The blower of the present invention includes: a blower fan comprising an axial fan, a quadruple fan, or a turbo fan, which sucks and discharges air along a rotational axis direction; and a guide vane disposed on the discharge side of the blowing fan to convert a rotational component into an axial component in the air flow of the rotating axial flow generated by the blowing fan, wherein the number of blades of the blowing fan and the number of blades of the guide vane are different from each other B, at least one of the blades of the blowing fan and the guide vane is characterized in that it is arranged so that the angle between the adjacent blades is non-uniform. According to the present invention, the blowing efficiency is improved and the noise is reduced.

Description

Air Blower and Air Purifier Including the Same

The present invention relates to a blower and an air purifier including the same, and more particularly, to a blower with improved blowing efficiency and reduced operating noise, and an air purifier including the same.

Recently, as air pollution represented by fine dust and ultra-fine dust has become serious, air purifiers are being used a lot at home or at work.

There are also wall-mounted air purifiers that can be hung on the wall, but most of them are of a tower type that is used while standing on the floor. A tower-type air purifier has a filter and a fan built-in in a rectangular or cylindrical case, and a suction part for sucking ambient air is generally formed on the side of the case, and a grill-type outlet for discharging purified air is formed on the upper part of the case. have

Such a tower type air purifier generally uses an axial fan, a mixed flow fan, or a turbo fan as a blower fan in order to create an upward flow of air inside the case. These axial fans, quadruple fans, or turbofans basically create an axial airflow directed upward along a rotational axis. These rotating components act as flow resistance to structures (cases, ducts, housings, grills, etc.) existing on the air flow path, resulting in a decrease in blowing efficiency as well as an increase in operating noise.

For this reason, conventionally, a guide vane for converting a rotating component into an axial component in an axial air flow generated by an axial fan, a co-current fan, or a turbofan has been often used.

However, most of the conventional guide vanes have simple straight or simple streamlined cross-sections, and lack of consideration for the number of blades and the angle between the blades is insufficient to improve performance, that is, improve blowing efficiency and reduce noise. .

An object of the present invention is to provide a blower with improved blowing efficiency and reduced noise, and an air purifier including the same, in view of the above problems.

A blower according to an aspect of the present invention includes: a blowing fan comprising an axial fan, a quadruple fan, or a turbo fan, which sucks and discharges air along a rotational axis direction; and a guide vane disposed on the discharge side of the blowing fan to convert a rotating component into an axial component in the air flow of the rotating axial flow generated by the blowing fan.

Here, the number of blades of the blowing fan and the number of blades of the guide vanes are different from each other, or at least one of the blowing fan and the guide vanes are arranged such that the angle between adjacent blades is uneven.

In addition, when the number of blades of the blowing fan and the number of blades of the guide vanes are different from each other, the number of blades of the blowing fan is a, and when the number of blades of the guide vanes is b, the least common multiple of a and b is a It can be configured in the same way as the product of and b.

In addition, when the blades of at least one of the blowing fan and the guide vanes are arranged so that the angle between the adjacent blades is uneven, the blades arranged so that the angle between the blades is uneven, each blade calculated by the following formula It may be arranged such that the absolute value of the sum of the Fx values of , and the absolute value of the total sum of the Fy values of each wing are respectively minimized.

Fx = F×cosθ, Fy = F×sinθ (where F is a force transmitted to each of the blades arranged so that the inter-blade angle is unequal, and is a positive constant, and θ is an angle with respect to any one blade. is the angle of the wings)

In addition, each of the blades of the guide vane may have an airfoil in which at least a portion of a wing chord, which is a straight line connecting the leading edge and the trailing edge in the blade cross-section, is outside the region formed by the outline of the blade cross-section.

In addition, an air purifier according to another aspect of the present invention includes: a case including a suction unit having a plurality of through-holes through which air can circulate; a filter disposed at a rear end of the suction unit inside the case; As a blower disposed at the rear end of the filter in the inside of the case, the blower described above; and a discharge unit coupled to the case at the rear end of the blower to discharge the air purified by the filter.

According to the blower according to an aspect of the present invention, the number of blades of the blowing fan and the number of blades of the guide vanes are different from each other, or the angle between the blades of the blowing fan or the guide vanes is unevenly arranged, so that the blowing efficiency of the blower is improved and noise is reduced.

In addition, the air purifier according to another aspect of the present invention is provided with the blower as described above, so that the blowing efficiency of the air purifier is improved and noise is reduced.

1 is a perspective view (a) and a side view (b) of an air purifier according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the air purifier shown in FIG. 1 .
FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1A.
4 is a plan view illustrating a guide vane provided in the air purifier shown in FIG. 1 .
5 is a view showing the flow of air passing through the point P shown in FIG. 4 together with a partial cross-section of the guide vane along the line VV of FIG. 4 .
Figure 6 shows the simulation result of the vorticity distribution according to the cross-sectional shape of the blade of the guide vane by flow analysis (Computational Fluid Dynamics), (a) is the vorticity distribution simulation result for a general streamlined blade and (b) is a vortex distribution simulation result for the wing of the airfoil according to an embodiment of the present invention.
7 is a diagram of a simulation result of the air flow (vortex distribution) around the blowing fan and guide vane of the air purifier according to an embodiment of the present invention by flow analysis.
8 is a graph showing the measurement of the operating noise of the air purifier. (a) is a case in which guide vanes having an equal angle between the blades are provided, (b) is a guide vane having an uneven angle between the blades. It is the result of measuring the operating noise of the case.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that there is. Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

In the drawings, the size of each component or a specific part constituting the component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Accordingly, the size of each component does not fully reflect the actual size. When it is determined that specific illustrations or descriptions of related well-known functions or configurations may unnecessarily obscure the gist of the present invention, such illustrations or descriptions will be omitted.

Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation only, and the position or direction of the object being placed, the position of the observer It is obvious to those skilled in the art that it may vary depending on the like. In this specification, these terms correspond to the x, y, and z axes shown in the drawings as follows. Top: z-axis direction, bottom: -z-axis direction, left: -x-axis direction, right: x-axis direction, before: -y-axis direction, after: y-axis direction. However, the terms 'front end' or 'rear end' used in this specification are used in the meaning of indicating the arrangement precedence relation between members based on the air flow direction, unlike the above 'before' or 'after'.

In addition, as used herein, the term 'coupled' or 'connected' refers to a case in which one member and another member are directly coupled or directly connected, as well as a case in which one member is indirectly coupled to another member through a joint member, or , including indirectly connected cases.

1 is a perspective view (a) and a side view (b) of an air purifier according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a line III-III of FIG. 1 (a). is a cross-sectional view.

Hereinafter, an air purifier according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 , and a blower according to the present invention constituting a part of the air purifier will be described. However, the following embodiment is an example when the blower according to the present invention is applied to a tower type air purifier, but the blower according to the present invention is an air purifier other than a tower type, and furthermore, a simple blower without an air purification function, etc., an axial fan, a four flow fan Or, of course, it can be applied to any device as long as it is a device that uses a turbofan to generate a flow of air.

1 to 3 , the air purifier 1 according to the present embodiment is a tower type air purifier that can be used while standing on the floor in a typical home or office. Although the present invention is not limited thereto, the tower-type air purifier 1 of the present embodiment may be a medium-sized air purifier to the extent that the user can change the installation location or change the direction by entering.

The air purifier 1 of this embodiment includes cases 10, 20, 31, frames 50, filters 41 and 45, fan modules 60, guide vanes 70, discharge units 30 and legs. (15) is provided. Here, the fan module 60 and the guide vane 70 correspond to main components constituting the blower according to the embodiment of the present invention.

The case is a member that accommodates the components of the air purifier 1 according to the present embodiment therein and forms the exterior of the air purifier, and has a cylindrical or polygonal column shape (a cylindrical shape in this embodiment). In addition, the case is formed with a suction portion formed with a plurality of through holes through which air can flow in order to suck in ambient air. The case of the air purifier 1 according to this embodiment includes a side suction unit 21 for sucking ambient air from a side of the air purifier, and a bottom suction unit 11 for sucking ambient air from a lower side of the air purifier. can do.

Specifically, the case may include a lower case 10 , a side cover 20 , and an upper cover 31 .

The lower case 10 together with the legs 15 form the lower structure of the air purifier 1, and support the components above it. The lower case 10 has a substantially cylindrical shape. In addition, a bottom suction part 11 having a plurality of through-holes through which air can flow is formed on the bottom surface of the lower case 10 .

The legs 15 are provided with a plurality (three in the present embodiment, but the number of legs is not limited thereto), respectively, extending downward from the bottom surface of the lower case 10 , and are formed by the legs 15 . The air purifier may be placed on the floor so that the bottom surface of the lower case 10 and the floor are spaced apart by a predetermined distance. As described above, the bottom surface of the lower case 10 is spaced apart from the bottom surface by the legs 15, so that the bottom suction part 11 formed on the bottom surface of the lower case 10 is exposed to expose the air below the bottom surface of the air purifier. It can be purified by inhalation.

In particular, in the present embodiment, the bottom surface of the lower case 10 may be configured to be inclined in one direction with respect to the floor (see FIGS. 1 ( b ) and 3 ). Accordingly, the plurality of legs 15 may also have different lengths in order to realize the inclination of the bottom surface of the lower case 10 . As described above, by inclining the bottom of the lower case 10 on which the bottom suction part 11 is formed in one direction with respect to the floor, it is possible to have directionality in the suction of ambient air close to the floor on which the air purifier is installed. That is, if the air purifier 1 is erected so that the side with the largest separation distance between the bottom and the bottom of the lower case 10 faces in one direction (the -y direction in the drawing), the You can purify the surrounding air by inhaling more intensively.

On the other hand, a support 19 having a larger contact area with the floor than the leg 15 may be coupled to the lower portion of the leg 15 for more stable support of the air purifier 1 .

Referring back to FIGS. 2 and 3 , the lower case 10 may include a lower filter mounting unit 13 and a pre-filter mounting unit 17 .

The lower filter mounting part 13 is a space for mounting a lower filter (first filter) 41 that purifies the air sucked through the bottom suction part 11 described above, and is a lower filter in the upper surface of the lower case 10 . According to the shape of (41), it can be dented downward and implemented in a form in which the center penetrates up and down.

On the other hand, the upper and lower distribution of dust present in a space to purify air by using an air purifier varies according to its size. That is, relatively large dust is mainly distributed on the bottom surface or a low place close to the floor surface, and small dust is distributed higher from the floor surface. Therefore, the air sucked through the bottom suction part 11 described above contains a lot of larger dust than the air sucked through the side suction part 21 to be described later, and the lower filter (first filter) ( 41) may be clogged faster than the side filter (second filter) 45 to be described later, thereby shortening the lifespan.

Accordingly, the air purifier 1 of the present embodiment may further include a pre-filter 43 between the bottom suction unit 11 and the lower filter 41 . The pre-filter 43 is a filter capable of filtering large-sized dust, and is preferably in a form that a user can clean and reuse. By providing the pre-filter 43 that can be frequently cleaned and reused in this way, the lifespan of the lower filter 41 can be extended.

The pre-filter mounting unit 17 provided in the lower case 10 is a space for mounting the pre-filter 43 , and is provided under the lower filter mounting unit 13 . The pre-filter mounting unit 17 is preferably configured so that a user can easily disassemble/assemble the pre-filter 43 . To this end, in the present embodiment, the pre-filter mounting unit 17 may be provided to be detachably provided by inserting/withdrawing the pre-filter 43 from one side of the lower case 10 .

Specifically, the pre-filter mounting part 17 includes a pre-filter insertion groove 17a into which the pre-filter 43 can be inserted on one side of the lower case 10, and the pre-filter insertion groove 17a inserted into the pre-filter insertion groove 17a. It may be implemented in the form of having support jaws 17b that slidably support both ends of the filter 43 . Furthermore, a latch 17c that operates in a toggle manner is mounted in the pre-filter mounting part 17 where the tip of the pre-filter 43, opposite to the pre-filter insertion groove 17a, abuts, so that the user can use the pre-filter 43 It can also be configured to be more easily detachable by pressing the rear end of the push button type.

The side cover 20 is mounted on the upper part of the lower case 10 and accommodates parts such as the frame 50 and the side filter (second filter) 45 therein and forms the side appearance of the air purifier 1 . do. In addition, a plurality of through-holes through which air can flow may be formed in the side cover 20 to form the side suction part 21 . A plurality of through holes are formed over the entire side surface along the circumferential direction of the side cover 20, so that the side suction unit 21 can suck ambient air over the entire side surface of the air purifier.

On the other hand, the side cover 20, as shown in Figure 2, may be made of two semi-cylindrical bodies (20a, 20b) symmetrical to each other, at least one of the two semi-cylindrical bodies (20a) is a lower filter ( The first filter) 41 and the side filter (second filter) 45 may be detachably coupled to the lower case 10 and the frame 50 for replacement.

Alternatively, the side cover 20 may be made of a single cylindrical body and may be detachably coupled in the vertical direction of the air purifier 1 .

The upper cover 31 is mounted on the side cover 20 and forms the upper exterior of the air purifier 1 together with the operation panel 90 to be described later. In addition, in the present embodiment, the upper cover 31 serves as a discharge grill having a through hole for discharging air purified by the air purifier. Accordingly, the detailed structure of the upper cover 31 will be described later along with the discharge unit 30 .

The frame 50 is coupled to the upper portion of the lower case 10 , and a structure that accommodates and supports a side filter (second filter) 45 , a blower to be described later, that is, the fan module 60 and the guide vane 70 therein. am. The frame 50 may include a lower frame 51 , a pillar 53 , and an upper frame 55 . In particular, the upper frame 55 functions as a housing or case for accommodating the blower, that is, the fan module 60 and the guide vane 70 according to the embodiment of the present invention.

The lower frame 51 has a hollow annular shape to expose the lower filter 41 and may be coupled to the upper portion of the lower case 10 . The upper frame 55 accommodates the fan module 60 and the guide vanes 70 therein, and may have an open top and bottom cylindrical shape, and is connected to the lower frame 51 and spaced apart from the lower frame 51 by a predetermined height through a pillar 53 .

The pillars 53 are formed of a plurality (three in this embodiment) along the outer periphery of the upper and lower frames 51 and 55 , but components constituting the upper frame 55 and the upper discharge portion 30 of the frame 50 . If they can stably support them, they can be made into one.

On the other hand, the side filter (second filter) 45 is accommodated in a space defined by the upper end of the lower frame 51 , the column 53 , and the lower end of the upper frame 55 . In this embodiment, the side filter 45 may be formed of a hollow cylindrical omnidirectional filter. Therefore, the air sucked in through the side suction part 21 formed over the entire circumferential direction of the side cover 20 described above is purified while passing through the omnidirectional side filter 45 and into the inner hollow of the side filter 45 . It is collected and flows upward by a blower fan 61 to be described later.

Here, it is preferable that the number of pillars 53 is as small as possible so as not to obstruct omnidirectional air intake by the side suction unit 21 , and after disassembling the side cover 20 , the side filter 45 is introduced from the side. It is preferable that at least two pillars 53 are disposed at a distance of 180 degrees or more without placing other pillars therebetween so that they can be replaced/withdrawn.

On the other hand, the lower filter 41 and the side filter 45 may be of an appropriate specification according to the desired air purification performance of the air purifier. For example, a High Efficiency Particulate Air (HEPA) filter or an Ultra-Low Penetration Air (ULPA) filter can be used as the lower filter 41 and the side filter 45. Considering the distribution according to the height, it is preferable to use a relatively high-performance one for the side filter 45 rather than the lower filter 41 .

The fan module 60 is a component constituting the blower according to the embodiment of the present invention, and is a component that generates an air flow leading to intake of ambient air, purification by a filter, and discharge of purified air. The fan module 60 is disposed at the rear end of the filters 41 and 45 in the air flow, that is, above the lower filter 41 and the side filter 45 .

Specifically, the fan module 60 is mounted inside the upper frame 55 and includes a blowing fan 61 and a fan motor 65 rotating the blowing fan 61 . The fan motor 65 is fixed to the upper frame 55 through a guide vane 70 to be described later, more specifically, inside the upper frame 55 so that the rotating shaft faces up and down, and the blowing fan 61 is the fan. It is coupled to the rotating shaft exposed downward of the motor (65).

The blowing fan 61 may be formed of an axial fan, a mixed flow fan, or a turbo fan. These axial fans, quadruple fans, or turbofans are basically in the direction of the rotation axis, and in this embodiment, create an axial air flow from the inner hollow of the side filter 45 to an upward direction. There is a rotating component created by the rotation of the fan. Such a rotating component may result in a decrease in blowing efficiency in the form of flow resistance, as well as an increase in operating noise. Accordingly, in this embodiment, a guide vane 70 for converting the rotational component of the air flow into an axial component is provided. The guide vane 70 may be fixed to the rear end of the blowing fan 61 , that is, to the upper portion of the blowing fan 61 inside the upper frame 55 . The detailed structure and operation of the guide vane 70 will be described later.

The discharge unit 30 is a member that is coupled to the upper part of the case, particularly the side cover 20 , and discharges purified air, and may include a discharge guide 35 and a discharge grill 31 .

The discharge guide 35 is coupled to the rear end, that is, the upper portion of the guide vane 70 to change the discharge direction of the purified air discharged upward through the guide vane 70, or the purified air is appropriately distributed. guide to discharge. In the present embodiment, the discharge guide 35 includes a side discharge port 35a to discharge a part of the purified air at least laterally. In addition, in the present embodiment, the discharge guide 35 may include an upper discharge port 35b to discharge the remaining part of the purified air upward. Specifically, as shown in FIG. 2 , the discharge guide 35 may include two side discharge ports 35a and two upper discharge ports 35b at positions symmetrical to each other.

The discharge grill 31 is coupled to the upper portion of the discharge guide to form an upper exterior of the air purifier. That is, as described above, the discharge grill 31 also serves as an upper cover. On the other hand, the discharge grill 31 has through holes 31a and 31b formed at positions corresponding to the respective discharge ports 35a and 35b of the discharge guide 35 , and each discharge port 35a and 35b of the discharge guide 35 is formed. The purified air discharged through the air purifier is smoothly discharged to the outside of the air purifier.

On the other hand, when the discharge guide 35 includes the side discharge port 35a and the purified air is discharged to the side, the flow path of the air discharged upward through the guide vane 70 at the front end is bent. In this case, in the corner of the side discharge port 35a of the discharge guide 35, fine dust that has not been filtered out by the filter or contamination that has entered the discharge guide 35 or the discharge grill 31 while the air purifier is stopped There may be a problem that dust, etc. contained in the air is attached. Accordingly, in the present embodiment, the user can easily disassemble the discharge grill 31 to remove dust attached to the corners of the discharge grill 31 and the discharge guide 35 , and assemble it to the discharge guide 35 again.

Specifically, by providing magnets 32 and 36 at predetermined positions of the upper surface of the discharge guide 35 and the bottom surface of the discharge grill 31 that face each other when assembled, the magnets 32 and 36 are discharged by the attractive force of the magnets 32 and 36 . The grill 31 is detachably coupled to the discharge guide 35 . At this time, the magnets 32 and 36 are connected to the discharge ports 35a and 35b of the discharge guide 35 when the discharge guide 35 and the discharge grill 31 are attached and coupled by the attractive force of the magnets 32 and 36 . It is preferable that the through-holes 31a and 31b of the discharge grill 31 are positioned and provided so that they are coupled to each other at positions coincident with each other.

Meanwhile, in the illustrated example, magnets 32 and 36 having opposite polarities are provided on the upper surface of the discharge guide 35 and the bottom surface of the discharge grill 31 , but the magnets are the upper surface and the upper surface of the discharge guide 35 . An object capable of being provided on only one of the bottom surfaces of the discharge grill 31 and attached to the other side by the magnetic force of this magnet may be disposed.

In this embodiment, the discharge guide 35 and the discharge grill 31 may be configured to be rotatable with an axis perpendicular to the floor as a rotation axis. To this end, the air purifier includes a rotation driving unit 80 for rotationally driving the discharge guide 35 and the discharge grill 31. Specifically, the rotation driving unit 80 includes the rotation unit housing 81 and the rotation mechanism 85. ) may be included.

The rotating housing 81 may have a cylindrical shape with a lower surface fixed to the upper guide vane 70 and an arc-shaped guide hole 81a formed on the upper surface.

The rotation mechanism 85 may be implemented with a rotation motor 85a and a gear block. Specifically, the rotation motor 85a is a motor capable of forward and reverse rotation, and is fixed to one side of the inner wall of the rotation unit housing 81 . The gear block includes a pinion gear 85b coupled to the rotation shaft of the rotation motor 85a, and a circular internal gear 85c that is spaced apart from the inner wall of the rotation unit housing 81 and rotates in engagement with the pinion gear 85b. In addition, a connecting rod 85d protruding upwards is formed on the upper surface of the circular internal gear 85c. The connecting rod 85d penetrates through the guide hole 81a formed on the upper surface of the rotating housing 81, and the upper end of the connecting rod 85d is coupled to the discharge guide 35, so that the discharge guide 35 and the discharge guide ( The discharge grill 31 coupled to the 35) rotates according to the rotation of the circular internal gear 85c. At this time, the rotation motor 85a is configured to rotate the connecting rod 85d forward and reverse so that the connecting rod 85d can reciprocate within the arc-shaped guide hole 81a.

The air purifier 1 of this embodiment may include an operation panel 90 . The operation panel 90 turns on/off the power of the air purifier, various buttons or switches for operating the driving strength (strong/weak), driving mode, etc., and furthermore, the surrounding air quality or filter replacement timing by the dust sensor (not shown). Display/alarm means such as various lamps or beepers for displaying lights may be included. The operation panel 90 may be coupled to the center of the upper surface of the rotating unit housing 81 at a position that does not interfere with the rotational operation of the discharge guide 35 and the discharge grille 31 or the attachment/detachment operation of the discharge grille 31 . .

As described above, the air purifier 1 according to the present embodiment includes a bottom suction unit 11 and an omnidirectional side suction unit 21 , and the discharge unit 30 includes a side discharge port 35a and an upper discharge port 35b. ), as shown by the arrow in FIG. 3 , it is possible to inhale and purify ambient air from below and from the side of the air purifier 1 , and then discharge the purified air upward and to the side.

Next, with reference to FIGS. 4 to 8, the detailed structure of the guide vane 70 constituting the blower of the present embodiment and its effects will be described.

4 is a plan view of the guide vane 70, and FIG. 5 is a view showing the flow of air passing through the point P shown in FIG. 6 is a view showing the simulation result of the vortex degree distribution according to the cross-sectional shape of the blade of the guide vane by flow analysis. In addition, FIG. 7 is a view of the simulation result of the air flow (vortex distribution) around the blowing fan and guide vane of the air purifier according to the embodiment of the present invention by flow analysis.

The guide vane 70 is a member that converts a rotational component into an axial component in the airflow directed upward through the filters 41 and 45 and the blowing fan 61 . The guide vane 70 may be fixed to the rear end of the blowing fan 61 inside the upper frame 55 , that is, the upper part. The guide vane 70 may include a central hub portion 71 and a plurality of blades 73 radially extending from the hub portion 71 .

The hub portion 71 has an open upper end and a through hole 71a formed in the center of the lower end of the cylindrical shape. The hub portion 71 is equipped with a fan motor 65 for rotating the blowing fan 61, and the fan motor 65) may be exposed below the hub portion 71 through the through-hole 71a at the bottom. The blower fan 61 is coupled to the rotating shaft of the fan motor 65 exposed under the hub 71, so that it can be rotatably mounted around the vertical central axis of the air purifier. That is, the hub portion 71 also functions as a fan motor housing.

The blade 73 of the guide vane 70, as shown in FIG. 3, is radially disposed on the outer periphery of the hub portion 71, and the hub portion ( 71) may be formed in a form in which the length of the chord (CL in FIG. 5) increases as the distance from it increases. In addition, each blade 73 of the guide vane 70 is curved so as to cancel the rotational component of the air flow generated by the rotation of the blowing fan 61 . That is, for example, if the direction of rotation of the blowing fan 61 is clockwise when viewed from above (see FIG. 4 ), as shown by arrow R in FIGS. 4 and 5 , it is emitted from the blowing fan 61 to guide The air flow Ai when it enters the blade 73 of the vane 70 contains an axial component Aa and a rotation component Ar, as shown in FIG. This air flow Ai is guided by the curved blade 73 while passing through the guide vane 70 so that the rotation component Ar is converted into the axial component Aa, and when exiting from the blade 73 of the guide vane 70, the rotation component There is no flow Ao with only the axial component.

On the other hand, the blade 73 of the guide vane 70 has generally been used to have a simple straight or simple streamlined airfoil in cross-sectional shape. That is, the conventional wing having a simple streamlined airfoil, as shown in FIG. 6 (a), has a streamlined shape in which the overall wing thickness increases and then gradually decreases, but the leading edge and the trailing edge in the wing cross section The wing chord (CL), which is a straight line connecting the (trailing edge), has a shape included in the region formed by the outline of the wing section. However, such a simple streamlined blade shows a flow of eddy or turbulence in the process in which air enters the leading edge of the blade and exits from the trailing edge, as shown in FIG. 6( a ). Such eddy currents or turbulences cause loss of energy in the form of flow resistance (decreased blowing efficiency) and increase noise.

In contrast, in the present embodiment, as shown in FIG. 5 , the point of the overall wing thickness increasing and then gradually decreasing is the same as that of FIG. Exists outside the region consisting of the outline of the wing section, that is, the contour of the wing section has a convex shape on one side and concave on the other side. As shown in (b) of FIG. 6 , the wing of this airfoil maintains a laminar flow without almost generating vortex or turbulence in the process of air entering the leading edge of the wing and exiting from the trailing edge. Therefore, in the guide vane 70 having airfoil blades according to the present embodiment, there is little loss of energy (decreased blowing efficiency) and much less noise than the guide vanes having general streamlined blades.

This point can also be seen from FIG. 7 . That is, when the guide vane 70 having the blade 73 of the airfoil according to the present embodiment is installed at the rear end (upper) of the blowing fan 61, the air flow is the blade ( 61a) shows a high degree of vorticity in the vicinity, but as it passes through the blades 73 of the guide vanes 70, the rotational component is converted into an axial component and the vorticity is also significantly reduced.

On the other hand, if the number of blades of the blowing fan 61 and the number of blades of the guide vanes 70 are the same, the blades 61a of the blowing fan 61 and the blades of the guide vanes 70 according to the rotation of the blowing fan 61 ( 73), periodic interaction noise may occur. Accordingly, in this embodiment, the number of blades of the blowing fan 61 and the number of blades of the guide vanes 70 are different from each other. At this time, even if the number of blades of the blowing fan 61 and the number of blades of the guide vanes 70 are different from each other, for example, the number of blades of the blowing fan 61 is a = 4 and the number of blades of the guide vane 70 is b = 8. If there is a multiple relationship, or if the least common multiple of a and b (=12) is less than the product of a and b (=24), such as when a=4 and b=6, the number of blades a and b are different. The periodic noise reduction effect obtained by doing so may be less. Therefore, if the number of blades a and b are different, the difference is made small (for example, a=14, b=13) so that the least common multiple of a and b (=182) is equal to the product of a and b (=182) It is more preferable to set

Furthermore, as another method of reducing the repetitive noise, a method of making the blade pitch (angle between adjacent blades) of the blowing fan 61 and/or the guide vane 70 non-uniform can be considered. At this time, since the blowing fan 61 is a rotating element, rather than applying an uneven pitch to the blades of the blowing fan 61 for stable rotation, applying an uneven pitch to the blades of the guide vanes 70 fixed without rotation. it is more preferable

Specifically, for example, in the above example, that is, in the case where the number of blades of the guide vane 70 is 13, if these 13 blades are equally arranged, the blade pitch (the angle between adjacent blades) is about 27.69 degrees ( = 360 degrees/13), but in this embodiment, as shown in FIG. 4 , the blades 73 are arranged with the blade pitch uneven (randomly). As such, the air flow passing through the guide vanes 70 to which the uneven pitch is applied has a change in phase compared to the air flow passing through the guide vanes of the equal pitch and disperses the peak noise energy, ultimately obtaining the overall noise reduction effect. can

8 is a graph showing the results of confirming the peak noise reduction effect when applying an unequal pitch. It is the result.

Specifically, a case in the form of a square column with a width × length × height of 330 mm × 330 mm × 920 mm is prepared, a blast fan with a diameter of 290 mm and 14 blades is installed therein, and a guide vane with 13 blades is installed on the upper part of the blowing fan. was installed. At this time, in (a), the angle between each blade (wing pitch) of the guide vanes was equalized to 27.69 degrees, and in (b), guide vanes to which uneven pitch as shown in FIG. 4 were applied were installed. Then, the blower fan was rotated at 1075 rpm, and noise was measured at five points spaced 1 m apart from the center of the upper end of the case by front, rear, left, right, and upward, respectively, and expressed as a root mean square (rms) value. .

As a result, as shown in FIG. 8, peak noise was observed in the frequency region of about 300 Hz for both the uniform pitch of (a) and the unequal pitch of (b), but the peak value was about 64.5 dB in (a), In case of (b), the peak noise was significantly reduced to about 48.9 dB.

As such, according to the blower of this embodiment, the cross-sectional shape of the blades of the guide vanes is not a simple streamline, but a specific airfoil, and the number of blades of the blowing fan 61 and the number of blades of the guide vanes 70 are different from each other, and further By making the blade pitch of the guide vanes 70 non-uniform, the rotational component in the air flow generated by the blowing fan is converted into an axial component, and the degree of vortex is significantly reduced, as well as the operating noise can be remarkably reduced. have.

On the other hand, when applying the unequal pitch as above, the specific arrangement angle of each blade can be determined by generating a random number between 0 and 360 as much as the number of blades. At this time, it is preferable in terms of minimizing energy loss to minimize the sum of the reaction forces applied to the blades of the blowing fan by applying the unequal pitch. The reaction force applied to the blades of the blowing fan can be expressed as the force (lift force) F transmitted to each blade of the fixed guide vane. In addition, this F can be expressed by dividing it into Fx, which is an x-direction component, and Fy, which is a y-direction component. When the arrangement angle (counterclockwise angle) of each blade as a reference is θ, it can be expressed as Fx = F × cosθ, Fy = F × sinθ. If the sum of the Fx values and the Fy values of each blade obtained in this way is close to 0 (that is, if the absolute value of each total is minimized), the reaction applied to the blades of the blower fan by applying the unequal pitch The sum of forces can be minimized.

In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of the present invention by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims.

1: Air purifier
10: lower case
11: Bottom suction part
13: lower filter mounting part
15: leg
17: pre-filter mounting part
19: base
20: side cover
21: side intake
30: discharge part
31: upper cover (discharge grill)
32: magnet
35: ejection guide
36: magnet
41: lower filter (first filter)
43: pre-filter
45: side filter (second filter)
50: frame
51: lower frame
53: pillar
55: upper frame
60: fan module
61: blow fan
61a: wings
65: fan motor
70: guide vane
71: hub part
73: wings
80: rotation driving unit
81: rotating housing
81a: guide hole
85: rotation mechanism
85a: rotation motor
85b: pinion gear
85c: circular internal gear
85d: connecting rod
90: operation panel

Claims (9)

a blowing fan comprising an axial fan, a quadruple fan, or a turbo fan, which sucks and discharges air along the rotational axis; and
and a guide vane disposed on the discharge side of the blowing fan to convert a rotating component into an axial component in the air flow of the rotating axial flow generated by the blowing fan,
The number of blades of the blowing fan and the number of blades of the guide vane are different from each other,
When the number of blades of the blowing fan is a and the number of blades of the guide vanes is b, the minimum common multiple of a and b is the same as the product of a and b. delete According to claim 1,
At least one blade of the blower fan and the guide vane is a blower disposed such that an angle between adjacent blades is uneven. 4. The method of claim 3,
The blades arranged so that the angle between the blades is non-uniform, the absolute value of the sum of the Fx values of each blade calculated by the following equation, and the absolute value of the total sum of the Fy values of each blade are the minimum blowers.
Fx = F×cosθ, Fy = F×sinθ (where F is a force transmitted to each of the blades arranged so that the inter-blade angle is unequal, and is a positive constant, and θ is an angle with respect to any one blade. is the angle of the wings) According to claim 1,
Each of the blades of the guide vane has an airfoil that exists outside a region in which at least a portion of a chord, which is a straight line connecting the leading edge and the trailing edge in the blade cross-section, is formed by the outline of the blade cross-section. a blowing fan comprising an axial fan, a quadruple fan, or a turbo fan, which sucks and discharges air along the rotational axis; and
and a guide vane disposed on the discharge side of the blowing fan to convert a rotating component into an axial component in the air flow of the rotating axial flow generated by the blowing fan,
At least one blade of the blowing fan and the guide vane is arranged so that the angle between the adjacent blades is uneven,
The blades arranged so that the angle between the blades is non-uniform, the absolute value of the sum of the Fx values of each blade calculated by the following equation, and the absolute value of the total sum of the Fy values of each blade are the minimum blowers.
Fx = F×cosθ, Fy = F×sinθ (where F is a force transmitted to each of the blades arranged so that the inter-blade angle is unequal, and is a positive constant, and θ is an angle with respect to any one blade. is the angle of the wings) delete 7. The method of claim 6,
Each of the blades of the guide vane has an airfoil that exists outside a region in which at least a portion of a chord, which is a straight line connecting the leading edge and the trailing edge in the blade cross-section, is formed by the outline of the blade cross-section. a case including a suction unit having a plurality of through-holes through which air can circulate;
a filter disposed at a rear end of the suction unit inside the case;
A blower disposed at the rear end of the filter inside the case, the blower according to any one of claims 1, 3 to 6, and 8; and
and a discharge unit coupled to the case at the rear end of the blower and discharging the air purified by the filter.

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