KR100341837B1 - Blower - Google Patents

Abstract

The present invention relates to a blower which is a so-called Sirocco fan, and in particular, when the scroll width is limited due to the limitation of the mounting space, the scroll expansion angle is changed, and the scroll radius is designed to be larger at the discharge area, thereby reducing the scroll width. The present invention relates to a blower capable of improving steam performance and reducing noise in a space in an area in which an expansion angle increase effect and a flow loss inside a scroll occur without increase.

The present invention for achieving the above object is formed so that a plurality of blades are mounted and rotated, and the air sucked by the impeller is formed to be guided along the flow path is gradually enlarged 160 at the cutoff starting angle of the suction area of the flow path Between 200 degrees or 200 degrees, the expansion angle of the outer radius of curvature is characterized in that it comprises a scroll housing which is formed smaller than the expansion angle by the archimedic curve and the expansion angle is larger than the archimedic curve.

Description

Blower {Blower}

The present invention relates to a blower which is a so-called Sirocco fan, and in particular, when the scroll width is limited due to the limitation of the mounting space, the scroll expansion angle is changed, and the scroll radius is designed to be larger at the discharge area, thereby reducing the scroll width. The present invention relates to a blower capable of increasing the performance of the blower and reducing noise by increasing the space of an area in which the expansion angle is increased and the flow loss inside the scroll without increasing.

In general, the so-called blower 10, called a sirocco fan, is a device widely used for conveying air, and as shown in FIG. 1, an impeller for generating a flow of air to be sucked and discharged as shown in FIG. 11) and a scroll housing 12 for guiding the flow of air sucked by the impeller 11.

Here, the impeller 11 is provided with a plurality of blades 11a supported by the rim 11b and connected to a driving unit such as a motor so as to be rotated. The scroll housing 12 has a flow path in which air sucked in accordance with the guidance of the bell mouse 13 through the inlet 12a formed at the front thereof is gradually enlarged from the cutoff position C, which is a reference of the outlet 12b. Therefore, it is designed to be discharged through the discharge port 12b. That is, when the impeller 11 connected to the driving unit rotates, the air in front of the suction port 12a is sucked and moved to the discharge port 12b along the gradually expanding flow path of the scroll housing 12, and then the air is discharged ( 12b) is discharged to the outside through the discharge port (12b) while recovering the dynamic pressure energy to the static pressure energy in the vicinity. Therefore, the design of the scroll housing that can reduce the noise and increase the air volume is being studied because the noise and air volume generated in the blower 10 are sensitively changed according to the design of the scroll housing 12.

Reference numeral θ denotes a reference angle, and Cθ denotes a cutoff starting angle at which the position C of the cutoff starts.

2 is a front view of a case in which a scroll housing of a blower according to the related art is designed using an archimedic curve and an exponential curve, and FIG. 3 is a related art. This is a graph showing the expansion angle when the scroll housing of the blower is designed using an archimetic curve and when using an exponential curve.

The conventional blower scroll housing 20 may be divided into a case of using an archimetic curve A and a case of using an exponential function curve E, as shown in FIGS. 2 and 3.

In the above, a method of constructing the outer diameter of the scroll housing 20 by using the archimedic curve A is such that the radius of curvature increases proportionally according to the average flow rate theory when the outer diameter of the scroll housing 20 is determined. As a structure, the radius of curvature R _χ when the expansion angle is α and the reference angle at that time is θ ° is calculated by Equation 1 below.

Here, R ₀ represents the outer diameter of the impeller 11.

The scroll housing 20 using the exponential function curve E whose curvature radius increases exponentially by the free vortex theory has a curvature radius R0 when the expansion angle is αe and the reference angle is θ °. ) Is calculated by Equation 2 below.

Reference numeral 20a denotes a suction port of the scroll housing, 20b denotes a discharge port of the scroll housing, C denotes a cutoff position, and Cθ denotes a cutoff starting angle, respectively.

However, in the case of the conventional blower using the archimetic curve and the width of the scroll housing is determined, the radius of curvature of the impeller 11 when the reference angle is 0 degrees and 360 degrees is the width of the scroll housing. Once determined, the inflation angle of the scroll housing is fixed. For example, when the radius of the impeller 11 is 40 mm and the width of the scroll housing is limited to 105 mm, the maximum expansion angle in the archimedic curve is 4.9897 degrees. Therefore, when the radius of the impeller is determined and the width of the scroll housing is determined, the expansion angle, which is a factor influencing air volume, is fixed. Therefore, in order to increase the expansion angle, the radius of the impeller must be reduced, which decreases performance and increases noise. There is a problem with importing.

The present invention has been made to solve the above-mentioned problems of the prior art, and from the start angle of the cut-off of the scroll housing to the suction area of 160 to 200 degrees smaller than the radius of curvature by the archimedic curve, the discharge area thereafter The purpose of the present invention is to provide a blower capable of improving performance and reducing noise by designing a larger curvature radius due to the archimedic curve.

1 is a front view in which a part of a general blower is cut away;

2 is a front view of a scroll housing of a conventional blower designed using an archimedic curve and an exponential curve;

3 is a graph showing the inflation angle when the scroll housing of the blower according to the prior art is designed using an archimetic curve and when using an exponential curve;

4 is a front view of a scroll housing which is a component of the blower according to the present invention;

5 is a graph showing the expansion angle and the radius of curvature of the blower according to the present invention,

Figure 6 is a graph showing the expansion angle and curvature radius and any constant of the blower according to the present invention, Figure 7 is a graph showing the air volume against the pressure of the blower according to the present invention and the conventional blower.

<Explanation of code about main part of drawing>

50 scroll housing 50a inlet port 50b discharge port

A: Archimedic curve C: Cutoff position Cθ: Cutoff start angle

IN: suction area OUT: discharge area RO: radius of impeller Rθ: radius of curvature of the outer surface of the scroll housing α, α1: expansion angle

The present invention is formed so that a plurality of blades are rotated and the impeller and the air sucked by the impeller is guided along a flow path that is gradually enlarged, and the outer edge between 160 degrees or 200 degrees from the cutoff start angle, which is the suction area of the flow path. And a scroll housing in which the expansion angle of the radius of curvature is smaller than the expansion angle due to the archimedic curve, and the expansion angle is formed larger than the archimetic curve thereafter.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

4 is a front view of a scroll housing which is a component of the blower according to the present invention, and FIG. 5 is a graph showing the expansion angle and the radius of curvature of the blower according to the present invention.

As shown in FIGS. 4 and 5, the blower according to the present invention guides the flow of air generated by the impeller (not shown), and the scroll housing 50 has a reference angle at the end of the curved surface thereof. when by the θ ₀₎ set an arbitrary angle (θ _χ) along the air flow direction, the cutoff start expansion angle (α ₁₎ from the respective (Cθ) θ _χ is from 160 degrees to 200 degrees to the vicinity of the perforated Medic curve ( It is designed to be smaller than the inflation angle α formed by A), and from that angle onwards, the inflation angle α ₂ of the scroll housing is designed to be larger than the inflation angle α by the archimedic curve.

That is, the radius of curvature at the portion corresponding to the suction region IN of the scroll housing 50 is smaller than the radius of curvature due to the archimetic curve, and the radius of curvature at the portion corresponding to the discharge region OUT is Aki. The curvature radius larger than the curvature radius due to the medic curve, and the curve forming the outer surface of the scroll housing 50 is modified by the archimedic curve to expand the expansion angle ( α ₁ , α ₂ ) according to an arbitrary angle ( θ _χ ) It was changed differently.

The scroll housing 50 may be designed in various ways, but according to one embodiment of the present invention, the design method is as follows. The radius of curvature R _{θ 1} is designed according to the mechanical condition as shown in Equation 3 below, but the expansion angle α ₁ is less than the expansion angle α due to the archimetic curve, and in the discharge region thereafter. The radius of curvature R _{θ 2} of the scroll housing is designed as shown in Equation 4 below by making the expansion angle α ₂ larger than the expansion angle α caused by the archimetic curve.

In the above formulaR ₀Is the radius of curvature of the impeller,θ _χ Is any angle from the reference angle in the direction of flow of air past the start of the cutoff,θ _OneIs a specific angle where the angle from the reference angle to the direction of air flow is between 160 and 200 degrees,R _{θ One}AndR _{θ 2}Angleθ _χAs the radius of curvature of the scroll housingR _{θ One}Isθ _χ end θ _OneRadius of curvature at angleR _{θ 2}Isθ _χ end θ _OneRadius of curvature at an ideal angle,α _OneIs from the reference angleθ _OneAngle of inflation up to an angle,α ₂Isθ _OneThe expansion angle at the above angles, and δ is an arbitrary constant.

6 is a graph showing the expansion angle and curvature radius of the blower according to the present invention and an arbitrary constant, where the arbitrary constant δ is two points as shown in FIG. Wow, The radius of curvature changes as a coefficient of an arbitrary quadratic function passing through. In the case where the width of the scroll housing is limited to 105.0331 mm, R ₀ = 40 mm and θ ₁ = The curvature radius of the scroll housing of the present invention when 180 °, α ₁ = 1.00, α ₂ = 8.55, δ = 0.0004, 0.0006, 0.0008, 0.001, and ArchiMedic with R ₀ = 40mm and α = 3.799 in 1 The radius of curvature of the scroll housing due to the curve is calculated and compared as follows.

The blower according to the present invention configured as described above, similar to the blower according to the prior art, when the impeller is rotated, the air in front of the suction port 50a is sucked in and the discharge port 50b is along the flow path gradually expanding from the cutoff start angle Cθ. the via being discharged to the outside, where the reference the scroll in each (θ ₀₎ the discharge area (OUT) due to 160 ° ~ 200 ° or more in size than the expansion angle (α ₂₎ is inflated, each (α) according to the prior art from the The radius of curvature of the outer portion of the housing 50 is large, and the amount of air discharged is increased.

FIG. 7 is a graph showing the air volume with respect to the pressure of the blower according to the present invention and the blower according to the prior art, it can be seen that the air volume increased at the same constant pressure as compared to the blower according to the prior art as shown.

As described above, the blower according to the present invention has a discharge radius (OUT) having a small radius of curvature and a large flow rate in the suction region (IN) in which the scroll housing (50) has little influence on the flow rate. In the outer radius of curvature is formed large, when the radius of the impeller and the width of the scroll housing 50 is provided to provide an effect of increasing the amount of air discharged.

Claims (2)

A plurality of blades are mounted and rotated, and the air sucked by the impeller is guided along a flow path which is gradually enlarged, and the outer curvature radius is between 160 degrees or 200 degrees from the cutoff start angle, which is the suction area of the flow path. And a scroll housing having an inflation angle smaller than the inflation angle caused by the archimetic curve and thereafter being formed in an inflation angle larger than the arcidic curve. delete