KR102650622B1 - Sirocco fan - Google Patents

Abstract

The present invention relates to a sirocco fan. A sirocco fan according to one aspect includes a fan unit that introduces a flow of air, a fan assembly including a fan motor that drives the fan unit, and a scroll that guides the flow of air, wherein the scroll controls the discharge and re-suction of the air flow. A cut-off portion forming a boundary surface, an outer peripheral portion surrounding the fan portion and extending along a spiral in the direction in which the fan portion rotates from the cut-off portion around the motor axis of the fan motor, and the scroll extending in a direction intersecting the outer peripheral portion. It is provided on a side part forming a side surface and a scroll curved part provided on the outer peripheral surface or a part connected to the outer peripheral surface, and includes a scroll curved part defined by two or more different curvature radii, and the blowing performance of the sirocco fan is adjusted by the scroll curved part. can be improved.

Description

Sirocco fan {SIROCCO FAN}

The present invention relates to a sirocco fan.

Generally, in the case of a sirocco fan used in a ducted indoor unit, the height of the ducted indoor unit is often low and space is limited. Since the scroll expansion angle of the sirocco fan cannot be made large in a ducted indoor unit with limited space, the diameter must be lowered or the upper portion of the scroll must be lowered to maintain the fan diameter and scroll expansion angle even if there are sections where the scroll cannot be expanded properly. /The bottom is cut off and used.

If the scroll does not expand at a constant rate from the cutoff position of the scroll to the discharge port and instead shrinks in some parts, there is a problem that the static pressure recovery is not properly achieved and the blowing performance deteriorates.

In the case of a conventional patent, the flow inside the scroll was improved by expanding the area close to the main plate, but in the case of a scroll with a low height such as a duct indoor unit, there is a problem that there is inevitably a section that is reduced from the straight part.

Generally, the sirocco fan used in an existing heat exchanger has a scroll shape in which the axial cross-section of the sirocco fan is designed as a spiral considering the expansion ratio, but the vertical cross-section on the side is formed in a square-shaped cross-section according to the general method, so the external If the air flow is not smooth, there is a problem in that blowing performance deteriorates.

Republic of Korea Publication No. 10-1999-0065953 (1999.08.16), Scirocco Fan's Scroll

In order to solve the above problems, the purpose of the present invention is to provide a sirocco fan that maintains a certain amount of sucked air and improves blowing performance by improving the scroll shape of the sirocco fan.

The purpose of the present invention is to provide a sirocco fan used in a total heat exchanger in which a curvature is formed on the scroll chamfer to ensure stable air intake even when the air flow outside the scroll is not smooth.

In the case of the sirocco fan used in the indoor unit duct of the present invention, the object is to provide a sirocco fan that forms a scroll protrusion that recovers the static pressure reduced by the cut surface when the scroll is cut to fit the indoor unit duct.

The sirocco fan according to the first embodiment of the present invention forms a scroll curved portion defined by two or more different curvature radii on the scroll chamfer on the side where air flows in the total heat exchanger to smoothly guide the air flow and improve blowing performance. It can provide improvement and noise reduction effects.

The chamfer may include a first chamfer and a second chamfer. Air flow can be guided by the first and second chamfers.

The first chamfer may extend from the cutoff portion to a chamfer location where air flows.

The second chamfer may extend from a position where air is introduced to a position of a discharge guide unit that guides the discharge of air.

The chamfer may include a first curved portion and a second curved portion.

The first curved portion may have a first radius of curvature (R1).

The second curved portion may have a second radius of curvature (R2).

The second radius of curvature (R2) may be larger than the first radius of curvature (R1).

The first and second curved parts may have a minimum value at the cutoff portion location and a maximum value at a location where air flow enters.

The chamfer may include a connection portion.

To prevent the internal flow area caused by the chamfer from being reduced, the height of the outer peripheral surface of the scroll may be more than 75% of the distance between symmetrical fan blades.

A sirocco fan according to an embodiment of the present invention has the upper and lower surfaces of a scroll cut and mounted on an indoor unit duct, and the scroll of the sirocco fan may include a scroll curve defined by two or more different radii of curvature. Static pressure recovery can be strengthened at the scroll curved portion.

The scroll curve may form a scroll protrusion.

The scroll protrusion may be formed at a position of 290 to 330 degrees from the reference point in the direction in which the fan unit rotates. Static pressure recovery may be achieved at the scroll protrusion.

The scroll protrusion may form a maximum radius of curvature at a position of 318° in the direction in which the fan unit rotates from the reference point.

According to an embodiment of the present invention, a curvature is formed in the scroll chamfer to stably suck air outside the scroll, thereby improving the blowing performance and heat exchange efficiency of the sirocco fan.

According to an embodiment of the present invention, by providing a scroll protrusion, the reduced static pressure in the linear part can be increased to a certain level, thereby improving blowing performance and reducing noise.

Figure 1 is a diagram showing an example in which the sirocco fan according to the first embodiment of the present invention is applied to a total heat exchanger.
Figure 2 is a diagram showing a total heat exchanger with the upper cover removed according to the first embodiment of the present invention.
Figure 3 is a perspective view of a sirocco fan according to the first embodiment of the present invention.
Figure 4 is a perspective view of the sirocco fan according to the first embodiment of the present invention from a different angle than Figure 3.
Figures 5(a) to 5(b) are side views and schematic diagrams of a sirocco fan according to the first embodiment of the present invention.
Figure 6 is a cross-sectional view taken along line 6-6 of Figure 3.
Figure 7 is an enlarged view of A' in Figure 6.
Figures 8(a) to 8(c) are diagrams comparing heat transfer efficiency, noise, and power dissipation according to wind volume between a total heat exchanger using a sirocco fan according to the first embodiment of the present invention and a conventional total heat exchanger.
Figure 9 is a diagram showing an example in which the sirocco fan according to the second embodiment of the present invention is applied to a duct indoor unit.
Figure 10 is a side view showing a sirocco fan mounted on a duct indoor unit according to a second embodiment of the present invention.
Figures 11(a) and 11(b) are diagrams showing the expansion angle according to the rotation angle of the siroccopan scroll according to the second embodiment of the present invention.
Figure 12(a) is a diagram showing the sirocco fan according to the second embodiment of the present invention mounted on the indoor unit duct and a cut surface is formed, and Figure 12(b) is a virtual view of the sirocco fan according to the second embodiment of the present invention. This is a drawing that defines the extension line and shows the location accordingly.
Figure 13(a) is a diagram showing the protruding position of the siroccopan scroll according to the second embodiment of the present invention, and Figure 13(b) is a diagram showing the protruding position of the siroccopan scroll according to the second embodiment of the present invention. This is a drawing showing the range based on an extension line.
Figure 14 is a graph showing the radius of curvature according to the rotation direction angle of the sirocco fan according to the second embodiment of the present invention.
Figure 15 is a graph showing the flow area according to the rotation direction angle of the sirocco fan according to the second embodiment of the present invention.
Figure 16 is a graph showing noise according to wind volume for the sirocco fan according to the second embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

Additionally, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

Figure 1 is a perspective view showing a total heat exchanger to which a sirocco fan is applied according to the first embodiment of the present invention, and Figure 2 is a diagram showing a total heat exchanger with the upper cover removed according to the first embodiment of the present invention.

Referring to FIGS. 1 and 2, the external shape of the total heat exchanger 1 to which the sirocco fan according to this embodiment is applied is formed by the housing 10. The housing 10 may be in the form of a box, and an accommodating space within which internal components such as the heat exchange unit 30 can be installed may be formed.

The housing 10 may be made of a metal material to ensure rigidity, but is not limited thereto.

The housing 10 may be equipped with a bracket or the like on the outside for convenience of installation. Therefore, the total heat exchanger 10 can be fixed to the installation area through the bracket.

The housing 10 may include a top cover 11, a side cover 12, and a bottom cover 13. The top cover 11 may be located above the side cover 12, and the bottom cover 13 may be located below the side cover 12. The top cover 11 and the bottom cover 13 may face each other in the vertical direction.

The bottom cover 13 and the side cover 12 may be formed integrally with each other. The top cover 11 can be detachably installed on the side cover 12 for convenience of replacing internal components.

The side cover 12 may be formed integrally, or may be formed by combining two or more side covers.

A first intake port 15 through which external air is sucked may be formed in the side cover 12. The first suction port 15 may be called an “external mechanism.”

A second intake port 16 through which indoor air is sucked may be formed in the side cover 12. The second intake port 16 may be called a “ventilation port.”

The side cover 12 may be formed with a first outlet 17 that discharges the air sucked in through the first inlet 15 into the indoor space. The first discharge port 17 may be called a “supply port.”

A second outlet 18 may be formed in the side cover 12 to discharge air sucked through the second intake port 16. The second outlet 18 may be called an “exhaust port.”

The outside air may be outdoor air. The outside air is generally cold and may have a low carbon dioxide content. On the other hand, the temperature of indoor air may be relatively high due to the body temperature of people active indoors. Additionally, the carbon dioxide content can be high due to people's breathing.

The total heat exchanger (1) discharges indoor air to the outdoors through the second inlet (16) and the second outlet (18), and supplies fresh air to the outdoors through the first inlet (15) and the first outlet (17). Outdoor air can be supplied indoors.

The first inlet 15 and the second outlet 18 may be formed on one side of the side cover 12, and the second inlet 16 and the first outlet may be formed on the other side, which is opposite to the one side. (17) can be formed. That is, the surface of the side cover 12 on which the first inlet 15 and the second outlet 18 are formed faces the surface on which the second inlet 16 and the first outlet 17 are formed. You can.

A damper may be installed in at least one of the first and second intake ports and the first and second discharge ports. For example, an outside air damper 15a may be installed in the first intake port 15. A ventilation damper 16a may be installed in the second intake port 16. An air supply damper 17a may be installed at the first outlet 17. An exhaust damper 18a may be installed in the second outlet 18.

At this time, it is preferable that the dampers installed at the first intake port 15 and the second intake port 16 through which air is sucked are electric dampers. The electric damper may include a vane that adjusts the opening degree of a flow path through which air flows depending on the rotation angle, and a damper actuator that operates the vane. The controller 40 can control the opening degree of each damper by operating the damper actuator. An increase in the damper opening may mean that the damper is open. A decrease in the damper opening may mean that the damper is closed.

By operating the damper actuator under the control of the controller 40, the rotation angle of the vane can be controlled. Accordingly, the suction of air through the first inlet 15 or the second inlet 16 can be controlled.

The dampers installed in the first exhaust port 17 and the second exhaust port 18 through which air is discharged are preferably back draft dampers (BDD). Accordingly, it is possible to prevent air from being sucked through the first exhaust port 17 and the second exhaust port 18.

Meanwhile, the controller 40 may be installed in the housing 10. In more detail, the controller 40 may be installed on the side cover 12. An opening for installing a controller may be formed in the side cover 12, and the controller 40 may be installed in the opening for installing the controller. The controller 40 may be installed to protrude toward the inside of the housing 10.

The controller 40 may be installed on a side of the side cover 12 where the first and second intake ports and the first and second discharge ports are not formed. For example, the second inlet 16 and the first outlet 17 are formed on the rear surface of the housing 10, and the first inlet 15 and the second outlet 18 are formed in the housing 10. ), the controller 40 may be installed on the right or left side of the housing 10.

The total heat exchanger (1) to which the sirocco fan is applied according to an embodiment of the present invention may include the air guide (20).

The air guide 20 may be made of various materials, but is preferably made of expanded polystyrene (EPS). Expanded polystyrene (EPS) is lightweight and has excellent insulation, soundproofing, and buffering properties, so it maintains insulation inside the heat exchanger (1), reduces noise generated from the blower (100), etc., and protects the total heat exchanger (1) from external shocks. ) has the advantage of protecting internal components. The air guide 20 can be manufactured as a single injection molding product and can be manufactured in various shapes.

The upper surface of the air guide 20 may be in contact with the lower surface of the top cover 11. That is, the upper surface of the air guide 20 may coincide with the upper surface of the side cover 12. In other words, it can be combined to cover the upper surface of the parts disposed inside the housing 10 of the air guide 20. Accordingly, the bottom cover 13 is placed on the lower part of the components, and the air guide 20 is placed on the upper part.

At least a portion of the side surface of the air guide 20 may be in contact with the inner surface of the side cover 12. Additionally, the overall height of the air guide 20 may be equal to the distance between the upper surface of the bottom cover 13 and the lower surface of the top cover 11.

A total heat exchanger (1) to which a sirocco fan is applied according to an embodiment of the present invention may include a heat exchange unit (30). The heat exchange unit 30 can exchange heat between outdoor air and indoor air.

The heat exchange unit 30 may have a substantially rectangular parallelepiped or cube shape. This is because the air guide 20 is located on the upper side of the heat exchange unit 30 to form the bypass passage 21.

The side of the heat exchange unit 30 may be installed at an angle rather than being parallel to the side cover 12. Preferably, the heat exchange unit 30 may be disposed with its side inclined at about 45 degrees to the side cover 12. Because of this, the internal space of the air guide 20 can be divided into four areas by the heat exchange unit 30. This may be explained as the internal space of the housing 10 being divided into four areas by the heat exchange unit 30.

That is, as the heat exchange unit 30 is installed at an angle, the internal space of the housing 10 has an external air space 51 communicating with the first intake port 15 and an air supply space communicating with the first outlet 17. (52), a ventilation space 53 communicating with the second intake port 16, and an exhaust space 54 communicating with the second outlet 18.

A plurality of heat exchange unit coupling grooves may be formed in the air guide 20 to contact the outer surface of the heat exchange unit 30 and mutually partition the internal space. The heat exchange unit coupling groove accommodates each corner area of the heat exchange unit 30, allowing the heat exchange unit 30 to be placed inside the air guide 20.

The external air space 51, the air supply space 52, the ventilation space 53, and the exhaust space 54 may be partitioned from each other by the air guide 20 and the heat exchange unit 30. As a result, a duct can be formed inside the housing 10. At this time, the duct may refer to a passage through which the sucked air flows and is discharged.

The duct includes an outdoor-indoor duct through which outdoor air is sucked in through the first intake port 15 and air is discharged through the first outlet port 17 for supplying the outdoor air indoors, and the second intake port 16. It may include an indoor-outdoor duct through which indoor air is taken in and the air is discharged to a second outlet 18 for exhausting the indoor air outdoors. The indoor-outdoor duct may include an outdoor air space 51 and a supply air space 52, and the outdoor-indoor duct may include a ventilation space 53 and an exhaust space 54.

The indoor-outdoor duct and the outdoor-indoor duct share the heat exchange unit 30, so that heat exchange between air flowing into each duct can occur in the heat exchange unit 30. To this end, the first inlet 15 and the first outlet 17 may be arranged to be staggered, and the second inlet 16 and the second outlet 18 may be arranged to be staggered. That is, the heat exchange unit 30 may be disposed in an intersection area of the indoor-outdoor duct and the outdoor-indoor duct.

However, a flow path conversion damper is installed in the indoor-outdoor duct, so that the air flowing into the indoor-outdoor duct can be adjusted to bypass the heat exchange unit 30 and not exchange heat with outdoor air.

A total heat exchanger (1) to which a sirocco fan is applied according to an embodiment of the present invention may include a blower (100). The blower 100 may be a sirocco fan.

For example, the blower 100 may include an exhaust blower and an air supply blower. The exhaust blower and the air supply blower may be blowers. The exhaust blower may be installed in the exhaust space 54, and the air supply blower may be installed in the air supply space 52.

Figure 3 is a perspective view of a sirocco fan according to a first embodiment of the present invention, Figure 4 is a perspective view of a sirocco fan according to a first embodiment of the present invention from a different angle than Figure 3, and Figure 5 is a perspective view of a sirocco fan according to a first embodiment of the present invention. This is a side view and schematic diagram of a sirocco fan according to one embodiment.

Referring to FIGS. 3 to 5 , the sirocco fan 100 according to an embodiment of the present invention may include a fan assembly 149 and a scroll 110 that guides the air flow.

The fan assembly 149 may include a fan unit 150 that sucks air flow and a fan motor 156 that drives the fan unit 150. The fan unit 150 may rotate by being coupled to the motor shaft 151 of the fan motor 156.

The fan unit 150 may include a main plate 152 coupled to the motor shaft 151 of the fan motor 156. The main plate 152 may be disposed approximately at the center of the fan unit 15 based on the axial direction. However, the position of the main plate 152 is not limited to this.

For example, the main plate 152 may have a disk shape.

The main plate 152 may include a shaft connection portion 153 that is coupled to the motor shaft 151 and provides rotational force to the fan portion 150. For example, the shaft connection portion 153 may include an insertion structure into which the motor shaft 151 is inserted. As another example, the shaft connection portion 153 may include a hole into which the motor shaft 151 is inserted.

The motor shaft 151 may constitute a rotation axis of the fan unit 150.

The main plate 152 may further include a plurality of reinforcing ribs to prevent deformation due to rotational force applied from the shaft connection portion 153.

The fan unit 150 includes a rim 156 arranged to be axially spaced apart from the main plate 152, and a plurality of blades 157 connecting between the main plate 152 and the rim 156. can do.

The rim 156 may have a ring shape. The rim 156 may be parallel to the main plate.

The plurality of blades 157 may be configured to have a length in the direction in which the motor shaft extends. The plurality of blades 157 may be configured to be arranged in the circumferential direction.

The plurality of blades 157 may include a first blade group 157a formed on the main plate 152 and spaced apart from the motor in the axial direction.

The plurality of blades 157 may include a second blade group 157b formed adjacent to the motor in the axial direction on the main plate 152.

The plurality of blades 157 may be formed symmetrically with respect to the main plate 152.

The scroll 110 may be coupled to the outside of the fan unit 150. The scroll 110 may form a scroll suction unit 130 that sucks air into the fan unit 150.

The scroll suction part 130 may be formed to penetrate the side part 115 of the scroll 110, that is, the side part 115 in the axial direction where the motor shaft extends.

The scroll 110 includes a scroll outer peripheral surface 120 arranged to surround the outer peripheral surface of the fan unit 150, and a discharge guide 117 extending from the outer peripheral surface 120 in a tangential direction of the fan unit 150. can do.

The scroll 110 may form a scroll discharge unit 118 for discharging air that has passed through the fan unit 150 to the outside of the sirocco fan 100. The scroll discharge portion 118 may be formed at an end of the scroll discharge guide 117.

The scroll 110 may further include a support portion 119 that supports the scroll discharge portion 118. The support portion 119 may be coupled to and supported on one side of the total heat exchanger (1).

The scroll 110 may further include a cutoff portion 116 that serves as an interface between discharge and re-intake of air flow. The cut-off portion 116 may be formed at a portion where the scroll outer peripheral surface 120 and the scroll discharge guide 117 meet.

The scroll 110 may be configured to draw a spiral shape from the cutoff portion 117 along the scroll outer peripheral surface 120 in the direction in which the fan portion rotates.

In the direction in which the fan unit rotates, the radial distance from the motor shaft 151 to the scroll outer peripheral surface 120 may be formed to gradually increase.

Referring to FIG. 5(b), a scroll 110 surface can be defined that is perpendicular to the direction through which the motor shaft 151 passes and includes four partitioned areas, and the four partitioned areas are It may include the first, second, third, and fourth quadrants (S1, S2, S3, and S4).

The scroll discharge unit 118 and the cutoff unit 116 may be located in the first quadrant S1.

Figure 6 is a cross-sectional view taken along line 6-6 of Figure 3, and Figure 7 is an enlarged view of A' in Figure 6.

Referring to FIGS. 5 to 7 , the scroll 110 may include a chamfer connecting the outer peripheral surface 120 and the side surface 115.

The chamfer may be formed so that the radial distance from the motor shaft 151 along the outer peripheral surface 120 gradually increases.

The chamfer may be formed symmetrically with respect to a plane perpendicular to the motor shaft 151. For example, the chamfer may be formed symmetrically with respect to the surface of the main plate 152.

The chamfer may include a first chamfer 111 on the side of the cut-off portion 116 and a second chamfer 112 in the direction into which the air flow flows.

The first chamfer 111 may extend from the cutoff portion 116 to the second chamfer 112 through which air flows.

The second chamfer 112 may extend from the first chamfer 111 to the discharge guide 117.

For example, the first chamfer 111 may be formed in at least one area of the first quadrant (S1) or the second quadrant (S2). The second chamfer 112 may be formed in at least one area of the third quadrant S3 or the fourth quadrant S4.

The chamfer constitutes a “scroll bend” defined by two or more different radii of curvature.

The chamfers 111 and 112 may include a first curved part 121 and a second curved part 122 connecting the outer peripheral surface 120 and the side surface 115.

A virtual circle forming the first curved portion 121 as a part of the circle may be defined. The virtual circle may have a center C1.

Specifically, the first curved portion 121 may form an arc having a first radius of curvature (R1) from the center (C1) of the virtual circle.

A virtual circle forming the second curved portion 122 as a part of the circle may be defined. The virtual circle may have a center C2.

Specifically, the second curved portion 122 may form an arc having a second radius of curvature (R2) from the center (C2) of the virtual circle.

The second radius of curvature (R2) may be greater than the first radius of curvature (R1).

The first and second radii of curvature (R1, R2) of the first and second curved portions 121 and 122 may have minimum values at the cutoff portion 116 of the first chamfer 111. For example, the first and second radii of curvature in the cutoff portion 116 may be the same. That is, the first and second curved portions 121 and 122 may share the center of the same circle.

The first and second radii of curvature (R1, R2) of the first and second curved portions 121 and 122 gradually increase while extending from the first chamfer 111 to the second chamfer 112. It can get bigger. That is, the size or area of the first curved portion 121 and the second curved portion 122 may gradually expand.

The first and second radii of curvature (R1, R2) may have maximum values in the section of the second chamfer 112. The maximum expanded first and second radii of curvature (R1, R2) can be extended and applied to the discharge guide (117).

The chamfers 111 and 112 may further include a connecting portion 123 connecting the first curved portion 121 and the second curved portion 122. The connecting portion 123 may form a straight line or a curved line.

The chamfers 111 and 112 may have a smooth shape due to the first and second curved portions 121 and 122 and the connecting portion 123, and may smoothly guide the air flow flowing into the suction portion 130.

As the first and second radii of curvature (R1, R2) of the chamfers (111, 112) increase, the internal passage area of the scroll (110) decreases, which may cause performance degradation of the sirocco fan (100).

The length from the air inlet end of one blade of the first blade group (157a) to the blade end of the second blade group (157b) that is symmetrical to the blade can be set as the blade outlet height (H). The blade outlet height (H) can be defined as “the height of the fan unit.”

In order to minimize the influence of the fan discharge flow caused by the chamfer, it may be desirable for the height (h) of the outer peripheral surface to be designed to be greater than or equal to a set ratio of the blade outlet height (H). For example, the setting ratio may be determined in the range of 75% to 80%.

If the ratio of the blade outlet height (H) to the height (h) of the outer peripheral surface is formed as small as 75% or less, a problem of deterioration of blowing performance may occur because the air flow area inside the scroll is not sufficiently secured. Therefore, in the present invention, this problem can be solved by setting the ratio to 75% to 80% or more.

Figure 8 is a graph showing a comparison between a total heat exchanger using a sirocco fan according to the first embodiment of the present invention and a conventional total heat exchanger in terms of heat transfer efficiency, noise, and power consumption.

Figure 8(a) is a graph comparing heat transfer efficiency according to wind volume. The total heat exchanger 10 using the sirocco fan 100 according to an embodiment of the present invention was measured to have higher heat transfer efficiency according to wind volume in all sections than the conventional total heat exchanger.

In particular, it was confirmed that the reduction in heat transfer efficiency when a high air volume was required was reduced to a greater extent than that of the conventional heat exchanger.

Figure 8(b) is a graph comparing noise according to wind volume. The total heat exchanger 10 using the sirocco fan 100 according to an embodiment of the present invention was measured to have lower noise at the same air volume than the conventional total heat exchanger.

Figure 8(c) is a graph comparing power consumption according to wind volume. It was measured that the total heat exchanger 10 using the sirocco fan 100 according to an embodiment of the present invention generates a higher air volume with the same power consumption than a conventional total heat exchanger.

Figure 9 is a perspective view showing a duct indoor unit to which a sirocco fan according to a second embodiment of the present invention is applied, Figure 10 is a side view of a sirocco fan according to a second embodiment of the present invention mounted on a duct indoor unit, and Figure 11 (a) to 11(b) are diagrams showing the expansion angle according to the rotation angle of the siroccopan scroll according to the second embodiment of the present invention.

Referring to FIGS. 9 to 11, the duct indoor unit 80 to which the sirocco fan according to the second embodiment of the present invention is applied has an indoor unit main body 80, a main body bottom part 81, and a main body bottom part 81 on both sides of the main body bottom part 81. The main body side part 82 and the main body upper surface part 83 connecting the tops of the two main body side parts 80, the main body rear part 85 and the main body upper surface part 83 provided at the rear of the main body upper surface part 83. It includes a main body front portion 86 provided on the front side.

The ducted indoor unit 8 has a substantially hexahedral shape by the main body bottom part 81, two main body side parts 82, the main body upper part 83, the main body rear part 85, and the main body front part 86. You can.

An installation space in which the sirocco fan 500 according to an embodiment of the present invention is installed may be formed inside the duct indoor unit 8.

A flow path (indoor unit flow path) for air passing through the sirocco fan 500 may be formed inside the ducted indoor unit.

The sirocco fan 500 may be seated on the bottom portion 81 of the main body.

The sirocco fan 500 may include a fan assembly 549 and a scroll 510.

The fan assembly 549 may include a fan unit 550 and a fan motor 556.

The fan motor 556 may be supported by a motor bracket 558. The motor bracket 558 is coupled to the main body bottom portion 81 and may be configured to extend upward.

The ducted indoor unit 8 may further include a main body front part 81 forming an indoor unit suction part 88 and a main body rear part 85 forming an indoor unit discharge part 89.

Air sucked through the indoor unit suction unit 88 may be sucked in in the axial direction of the sirocco fan 500, discharged in the radial direction, and discharged through the indoor unit discharge unit 89.

The ducted indoor unit 8 includes an indoor unit flow path 90 through which air discharged from the sirocco fan 500 flows, and the air can be discharged from the indoor unit through the indoor unit discharge portion 89 via the indoor unit flow path 90. there is.

The ducted indoor unit 8 may further include a support bracket 70 that supports the scroll 510. The support bracket 70 supports the scroll discharge guide 515 and may extend from the bottom portion 81 of the main body to the upper portion 83 of the main body.

The scroll 510 may be coupled to the outside of the fan unit 550. The scroll 510 may form a scroll suction part 530 that sucks air into the fan part 550.

The scroll suction part 530 may be formed to penetrate the side part 515 of the scroll 510, that is, the side part 515 in the axial direction where the motor shaft extends.

The scroll 510 includes a scroll outer peripheral surface 520 arranged to surround the outer peripheral surface of the fan unit 550, and a discharge guide 517 extending from the outer peripheral surface 520 in a tangential direction of the fan unit 550. can do.

The scroll 510 may form a scroll discharge unit 518 for discharging air that has passed through the fan unit 550 to the outside of the sirocco fan 500. The scroll discharge portion 518 may be formed at an end of the scroll discharge guide 517.

The scroll 510 may further include a support portion 519 that supports the scroll discharge portion 518. The support portion 519 may be coupled to and supported on one side of the duct indoor unit 8.

The scroll 510 may further include a cutoff portion 516 that serves as an interface between discharge and re-intake of air flow. The cut-off portion 516 may be formed at a portion where the scroll outer peripheral surface 520 and the scroll discharge guide 517 meet.

The scroll 510 may be formed to draw a spiral shape from the cutoff portion 517 along the scroll outer peripheral surface 520 in the direction in which the fan portion 550 rotates.

For example, the direction in which the fan unit 550 rotates may be clockwise with respect to FIG. 12 .

In the direction in which the fan unit 550 rotates, the radial distance R from the center of the motor shaft 551 to the scroll outer peripheral surface 520 may be formed to gradually increase.

The radial distance (R) from the center of the motor shaft 551 to the scroll outer peripheral surface 520 may be referred to as “radius of curvature.”

For example, the radius of curvature (R) may be expanded to the expansion angle (α) of the logarithmic spiral.

The expansion angle α is not a fixed value, and may be defined as a value that gradually increases in the direction in which the fan unit 550 rotates.

Figure 12(a) is a diagram showing a sirocco fan according to a second embodiment of the present invention mounted on an indoor unit duct and a cut surface is formed, and Figure 12(b) is a virtual view of a sirocco fan according to a second embodiment of the present invention. This is a drawing that defines the extension line and shows the location accordingly.

Referring to FIG. 12, a portion of the scroll 510 may be cut to fit the narrow space of the duct indoor unit 8.

For example, the scroll 510 may be cut in a portion that contacts the outer peripheral surface 520 of the scroll and the main body bottom 81 of the duct indoor unit 8 to form the first linear part 525. The first linear part 525 may be formed parallel to the bottom surface 81 of the main body.

The scroll 510 may form a second linear portion 526 by cutting a portion that contacts the outer peripheral portion 520 of the scroll and the upper surface portion 83 of the body of the duct indoor unit 8. The second linear portion 526 may be formed parallel to the bottom surface 81 of the main body. The second linear part 526 may be connected to the discharge guide 517.

The outer peripheral surface 520, which extends from the cutoff part 516 according to the radius of curvature (R) in the direction in which the fan part rotates, may have a section that is reduced by the first and second linear parts 525 and 526. .

Referring to FIG. 12(b), a first extension line (L1) connecting the cutoff portion from the motor shaft can be defined.

When the first extension line is rotated in the direction in which the fan unit 550 rotates, a second extension line L2 that meets the end of the scroll discharge unit 518 can be defined.

A third extension line (L3) perpendicular to the second extension line (L2) may be defined around the motor axis.

The point where the third extension line L3 and the second linear part 526 meet can be defined as a reference angle of 0 degrees. In other words, the third extension line (L3) can be a “baseline”.

It can be defined as the angle increasing in the direction in which the fan unit 550 rotates from the third extension line L3.

The range of 0 to 90 degrees from the baseline is the first quadrant (S1), the range of 90 to 180 degrees from the baseline is the second quadrant (S2), and the range of 180 to 270 degrees from the baseline is the third quadrant (S3). , the range of 270 to 360 degrees from the reference line can be defined as the fourth quadrant (S4).

For example, the first linear part 525 may be formed in a range between 160 and 205 degrees from the baseline. The second linear part 526 may be formed at an angle between 330 and 360 degrees from the baseline.

Static pressure recovery may not be properly achieved by the first and second linear parts 525 and 526, so the blowing performance of the sirocco fan 500 may deteriorate.

Figure 13(a) is a diagram showing the protruding position of the siroccopan scroll according to the second embodiment of the present invention, and Figure 13(b) is a diagram showing the protruding position of the siroccopan scroll according to the second embodiment of the present invention. This is a drawing showing the range based on an extension line.

location Angle radius of curvature A 270 126.7 B 290 133 C 318.3 151.7 D 330.5 147.5

Referring to Figures 12 to 13 and [Table 1], the sirocco fan 500 according to the second embodiment of the present invention is intended to reinforce the static pressure recovery that is reduced in the first and second linear parts 525 and 526, By improving the shape of the scroll 510, a scroll protrusion that generates static pressure recovery can be provided.

The static pressure of the air flow can be restored by the scroll protrusion 513.

The scroll protrusion 513 constitutes a “scroll curve” defined by two or more different radii of curvature.

When defining the shape of a scroll having a radius of curvature designed to increase with the preset expansion angle (α), the scroll protrusion 513 has a radius of curvature determined by an expansion angle (β) greater than the expansion angle (α). do. That is, the scroll protrusion 513 may be determined by the expansion angle at which the increasing width becomes larger.

The scroll 510 according to the second embodiment of the present invention may include a scroll protrusion 513. The scroll protrusion 513 may be formed in the fourth quadrant S4. For example, the scroll protrusion 513 may be formed in an area of 290 to 330 degrees from the third extension line L3 in the direction in which the fan unit 550 rotates.

In the scroll protrusion 513, a position corresponding to 270° in the direction in which the fan unit 550 rotates from the third extension line L3 can be set as the first point A.

In the scroll protrusion 513, a position corresponding to 290° in the direction in which the fan unit 550 rotates from the third extension line L3 can be set as the second point B. It may have a third radius of curvature (R3) at the second point (B).

In the scroll protrusion 513, a position corresponding to 318° in the direction in which the fan unit 550 rotates from the third extension line L3 can be set as the third point C. It may have a fourth radius of curvature (R4) at the third point (C). The fourth radius of curvature R4 may have a maximum value. At the third point C, the scroll protrusion 513 may be fully expanded. For example, the fourth radius of curvature (R4) may increase by about 15% compared to the radius of curvature of an existing scroll at the same angle.

In the scroll protrusion 513, a position corresponding to approximately 330° in the direction in which the fan unit 550 rotates from the third extension line L3 may be set as the fourth point D. It may have a fifth radius of curvature (R5) at the fourth point (D).

The scroll protrusion 513 may be formed at the first point (A) to the fourth point (D).

From the first point (A), the third point (C) can be defined as the first part, and from the third point (C), the fourth point (D) can be defined as the second part. .

The radius of curvature (R) in the first part may increase.

The radius of curvature (R) in the second part may decrease.

Figure 14 is a graph showing the radius of curvature according to the rotation direction angle of the sirocco fan according to the second embodiment of the present invention, and Figure 15 is a graph showing the flow area according to the rotation direction angle of the sirocco fan according to the second embodiment of the present invention. This is a graph, and Figure 16 is a graph showing noise according to wind volume for the sirocco fan according to the second embodiment of the present invention.

Referring to FIGS. 14 to 16, the radius of curvature (R) increases with the expansion angle (α) along the rotation direction of the fan unit from the third extension line (L3) and then decreases at the first linear portion (525). You can. When the radius of curvature (R) decreases, the flow area inside the scroll 510 may also decrease.

The radius of curvature (R) passing through the first linear portion 525 increases with an expansion angle (α) and then protrudes from the scroll protrusion 513 with an expansion angle (β).

The expansion angle of the radius of curvature (R) may decrease again after passing the third point (C).

The flow area increases in the scroll protrusion 513, and static pressure recovery can be achieved. The static pressure recovery reinforced in the scroll protrusion 513 may be greater than the static pressure not recovered in the first linear part 525.

The sirocco fan 500 according to the second embodiment of the present invention may produce less noise than the existing blower fan at the same air volume.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: Sirocco fan 110: Scroll
111: first chamfer 112: second chamfer
113: Connection 151: Motor shaft
525: 1st linear part 526: 2nd linear part
513: scroll protrusion

Claims (13)

A fan assembly including a fan unit for introducing a flow of air and a fan motor for driving the fan unit; and
A scroll that guides the flow of air passing through the fan unit;
The scroll is,
A cut-off portion forming an interface between discharge and re-intake of air flow;
an outer peripheral surface surrounding the fan unit and extending in a spiral shape from the cutoff unit in the direction in which the fan unit rotates around the motor axis of the fan motor;
a side portion extending in a direction intersecting the outer peripheral surface to form a side surface of the scroll; and
It is provided on the outer peripheral surface or a portion connected to the outer peripheral surface, and includes a scroll curve defined by two or more different curvature radii,
It further includes a first linear part cut parallel to the bottom of the main body to fit the space where the scroll is installed, and a second linear part cut parallel to the upper part of the main body opposite the first linear part,
The scroll curved portion includes a scroll protrusion determined by an expansion angle whose increasing width becomes larger, and wherein the scroll protrusion is formed adjacent to the second linear portion. According to claim 1,
The scroll curved portion includes a chamfer connecting the outer peripheral portion and the side portion,
The chamfer is,
a first curved portion having a first radius of curvature;
a second curved portion having a second radius of curvature different from the first radius of curvature; and
A sirocco fan comprising a connection part linearly extending from the first curved part to the second curved part. According to claim 2,
The chamfer extends so that the radius of curvature increases based on the direction in which the fan unit rotates,
A sirocco fan comprising a first chamfer adjacent to the cutoff portion and a second chamfer extending from the first chamfer in a direction in which the fan portion rotates and on a side into which an air flow flows. According to claim 3,
The sirocco fan is characterized in that the first radius of curvature and the second radius of curvature are larger in the second chamfer than in the first chamfer. According to claim 3,
Defining a scroll plane perpendicular to the direction through which the motor axis passes and including four partitioned areas, wherein the four partitioned areas include first to fourth quadrants,
The scroll further includes a scroll discharge portion,
The sirocco fan is characterized in that the scroll discharge part and the cut-off part are located in the first quadrant, and the second chamfer is located in at least one of the third or fourth quadrant of the scroll surface. According to claim 2,
The first curved portion is connected to the outer peripheral portion, and the second curved portion is connected to the side portion,
The sirocco fan is characterized in that the second radius of curvature is equal to or greater than the first radius of curvature. According to claim 1,
A sirocco fan characterized in that the outer peripheral surface includes a linear portion extending linearly. delete According to claim 5,
a first extension line connecting the cutoff portion from the motor shaft;
a second extension line that meets an end of the scroll discharge unit when the first extension line is rotated in the direction in which the fan unit rotates; and
It includes a third extension line perpendicular to the second extension line centered on the motor axis,
The sirocco fan is characterized in that the first and second linear parts pass through the third extension line, and the second linear part extends to a discharge guide that guides the air flow. According to clause 9,
The scroll protrusion includes a first part whose radius of curvature increases in the direction in which the fan unit rotates, and a second part that extends from the first part in the direction in which the fan unit rotates and whose radius of curvature decreases. Sirocco fan with . According to claim 10,
When the point where the third extension line and the second linear unit intersect is defined as a reference angle of 0 degrees, and the reference angle increases in the direction in which the fan unit rotates,
A sirocco fan, characterized in that the scroll protrusion is formed in the region of 270 to 330 degrees. According to claim 11,
A sirocco fan, characterized in that the radius of curvature of the first part of the scroll protrusion increases from 270° to 318° and decreases in the second part after 318°. According to clause 9,
Defines a scroll plane perpendicular to the direction through which the motor shaft passes and includes four partitioned regions, and the four partitioned regions include first to fourth quadrants,
The sirocco fan is characterized in that the scroll discharge portion and the cutoff portion are located in the first quadrant, and the scroll protrusion is located in the fourth quadrant.

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