Centrifugal fan assembly

Abstract

A centrifugal fan assembly of the present invention comprises: a plurality of first vanes that guide the discharge of air and function as a sirocco fan; and a plurality of second vanes that have a gentler curvature than the first vanes and function as a turbo fan. Accordingly, a single centrifugal fan can simultaneously provide the effects of both a turbo fan and a sirocco fan.

Description

Centrifugal fan assembly

[0001] The present invention relates to a new type of centrifugal fan assembly with improved static pressure performance.

[0002] Generally, a blower fan is a device that moves gas by generating air pressure, and it is used in various home appliances such as air conditioners, air purifiers, and humidifiers.

[0003] These blower fans are available in various types depending on their intended use, application area, or application product. For example, the blower can be classified into axial fans and centrifugal fans depending on the method of air intake and discharge.

[0004] Here, the axial fan is a fan formed so that the intake and discharge of air are directed in the same direction, and the centrifugal fan is a fan formed so that air is drawn in axially and discharged radially.

[0005] The above centrifugal fans include Sirocco fans and turbo fans.

[0006] The above-mentioned Sirocco fan is a fan suitable for high airflow and low noise, and is provided with a hub in the center, and a plurality of vanes are spaced apart around the perimeter to form a forward-facing blade structure in which the blades are laid in the direction of rotation. Various inventions related to this are provided, such as Published Utility Model No. 20-2018-0003194, Published Patent No. 10-2015-0098101, Published Patent No. 10-2023-0105397, and Published Patent No. 10-2019-0115918.

[0007] Conventional Sirocco fans are centrifugal fans with forward-facing blades and possess higher pressure performance compared to axial fans. Additionally, while these Sirocco fans are suitable for high airflow and low noise, they have lower static pressure performance than backward-facing centrifugal fans (turbo fans).

[0008] The above turbofan has the advantage of providing excellent static pressure performance, and multiple vanes are spaced apart from the hub to the periphery. Various designs related to this are provided, such as in Published Patent No. 10-2014-0124196 and Registered Patent No. 10-2671477.

[0009] The aforementioned conventional turbofan (backward-wing centrifugal fan) provides high static pressure performance, but has the disadvantage of having a lower airflow than a Sirocco fan and producing more noise.

[0010] Meanwhile, various technologies have recently been developed to minimize noise generation under conditions of generating the same airflow. As an example, Published Patent No. 10-2023-0121324 provides a centrifugal fan that reduces noise generation by placing a sub-blade acting as a splitter between a plurality of main blades.

[0011] However, centrifugal fans of this structure have the disadvantage that it is difficult to obtain a higher airflow because the airflow guided by each blade is directed in the same direction as the rotation direction of the centrifugal fan.

[0012] In addition, recently, centrifugal fans are provided with a composite design of multiple vanes having different lengths, curvatures, or arrangements to improve the static pressure performance of the fan while obtaining a high airflow. In this regard, as disclosed in International Patent Publication WO2020-217367, International Patent Publication WO2019-082378, etc.

[0013] However, since the centrifugal fan of the aforementioned structure is formed with each vane being continuously and repeatedly bent from the air inlet side to the air outlet side, the gap between the vanes inevitably becomes large, and this causes a problem in which the flow is separated due to the large gap between the vanes.

[0014] Furthermore, if the gap between each vane is formed narrowly to solve the above problem, not only is molding difficult, but there is also a disadvantage that the turbofan's function cannot be fully performed, making it impossible to obtain high static pressure performance.

[0015] The present invention has been devised to solve various problems according to the aforementioned prior art, and the objective of the present invention is to provide a new type of centrifugal fan assembly that can improve static pressure performance while performing the function of a Sirocco fan.

[0016] The objective of the present invention is to provide a new type of centrifugal fan assembly that can improve static pressure performance while preventing air flow separation between each vane.

[0017] The object of the present invention is to provide a new type of centrifugal fan assembly in which air is smoothly guided from turbo vanes to sirocco vanes.

[0018] According to the centrifugal fan assembly of the present invention for achieving the above-mentioned purpose, it includes a plurality of first vanes and a plurality of second vanes having different shapes.

[0019] According to the centrifugal fan assembly of the present invention, a plurality of first vanes and a plurality of second vanes are formed spaced apart from each other in a radial direction from the rotation center of the centrifugal fan so that air introduced into the centrifugal fan can be guided sequentially.

[0020] According to the centrifugal fan assembly of the present invention, the first vanes can provide the function of a Sirocco fan. To this end, a plurality of first vanes are spaced apart along the outer perimeter of the base.

[0021] According to the centrifugal fan assembly of the present invention, second vanes can provide the function of a turbo fan. To this end, a plurality of second vanes are spaced apart along the inner circumference of the base.

[0022] According to the centrifugal fan assembly of the present invention, the first vane and the second vane may be spaced apart from each other in the direction in which air is guided so that the functions of a turbo fan and a sirocco fan are distinguished.

[0023] According to the centrifugal fan assembly of the present invention, the second vane may provide the function of a turbo fan and the first vane may provide the function of a Sirocco fan. To this end, the second vane may be formed longer than the first vane, the first vanes may be provided in greater quantities than the second vanes, the spacing between the first vanes may be formed narrower than the spacing between the second vanes, or the first vane may be formed to have a greater curvature than the second vane.

[0024] According to the centrifugal fan assembly of the present invention, flow separation occurring while air passing between two adjacent second vanes passes through a plurality of first vanes can be reduced. To this end, a plurality of first vanes may be provided within the gap between the rear ends of each second vane.

[0025] According to the centrifugal fan assembly of the present invention, the spacing between the rear ends of each second vane can be formed wider than the spacing between the front ends of each first vane.

[0026] According to the centrifugal fan assembly of the present invention, each first vane and second vane may be formed to bend in opposite directions to improve static pressure performance.

[0027] According to the centrifugal fan assembly of the present invention, the base is formed of a hub forming a center of rotation and a plate extending around the hub.

[0028] According to the centrifugal fan assembly of the present invention, first vanes can be provided along the circumference of the main plate to perform the function of a Sirocco fan.

[0029] According to the centrifugal fan assembly of the present invention, second vanes can be provided along the circumference of the hub to perform the function of a turbo fan.

[0030] According to the centrifugal fan assembly of the present invention, a third vane may be further provided between the first vane and the second vane so that air flowing along the second vane is smoothly supplied to the first vane.

[0031] According to the centrifugal fan assembly of the present invention, the first vane and the second vane may be formed to guide air in different directions. The third vane may be formed so that the air guided to the second vane bends toward the first vane in a direction opposite to that of the first vane.

[0032] According to the centrifugal fan assembly of the present invention, the third vane can be formed to have a greater curvature than the second vane. That is, the third vane can be formed to change the direction of air flow more abruptly than the second vane.

[0033] According to the centrifugal fan assembly of the present invention, the third vane can be formed to bend in the same direction as the second vane so as to facilitate air transfer between the first vane and the second vane, which are bent in different directions.

[0034] According to the centrifugal fan assembly of the present invention, the third vane may be formed to bend in the opposite direction to the first vane in order to facilitate air transfer between the first vane and the second vane, which are bent in different directions.

[0035] According to the centrifugal fan assembly of the present invention, the third vane may be formed to have a curvature different from that of the first vane and / or the second vane. The third vane may be formed to have a curvature smaller than that of the first vane and larger than that of the second vane.

[0036] According to the centrifugal fan assembly of the present invention, the number of third vanes is less than the number of first vanes.

[0037] According to the centrifugal fan assembly of the present invention, the number of third vanes is greater than the number of second vanes.

[0038] According to the centrifugal fan assembly of the present invention, the leading edge, which is the leading side (air outflow side) of the second vane, may be formed to face the trailing edge, which is the trailing side (air inflow side) of one of the third vanes, so that air flow can be continuous.

[0039] According to the centrifugal fan assembly of the present invention, the leading edge of the third vane may be formed to face the trailing edge of one of the first vanes so that air flow can be continuous.

[0040] According to the centrifugal fan assembly of the present invention, the third vane is fixed, and the first vane and the second vane can rotate together with the base. To this end, the third vane may be formed in an orifice. Thus, air guided to the second vane by the rotation of the base can smoothly pass between the first vanes under the guidance of the third vane.

[0041] The centrifugal fan assembly of the present invention as described above has the following various effects.

[0042] The centrifugal fan assembly of the present invention is provided with a second vane for the function of a turbo fan in addition to a conventional Sirocco fan having a plurality of first vanes. This allows for the improvement of static pressure performance that is insufficient with only the first vanes.

[0043] In the centrifugal fan assembly of the present invention, each second vane is formed separately from the first vane without being connected to it. This minimizes defects during molding and enables precise shaping of each vane (shaping of curvature, length, etc.).

[0044] The centrifugal fan assembly of the present invention can provide even better static pressure performance by additionally providing a third vane fixed together with an orifice. That is, the flow passing through a single centrifugal fan is compressed in multiple stages, thereby enabling the provision of even better static pressure performance.

[0045] The centrifugal fan assembly of the present invention allows air passing through the second vane to be smoothly guided between each first vane by providing a third vane, thereby enabling an increase in discharge air velocity.

[0046] FIG. 1 is a planar perspective view showing a centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0047] FIG. 2 is a bottom perspective view showing a centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0048] FIG. 3 is a plan view showing a centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0049] FIG. 4 is a cross-sectional view showing a centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0050] FIG. 5 is an exploded perspective view of a centrifugal fan assembly according to an embodiment of the present invention.

[0051] FIG. 6 is an assembled perspective view of a centrifugal fan assembly according to an embodiment of the present invention.

[0052] FIG. 7 is a side view of a centrifugal fan assembly according to an embodiment of the present invention.

[0053] FIG. 8 is a cross-sectional view along line AA of FIG. 7.

[0054] Fig. 9 is an enlarged view of section “A” in Fig. 8.

[0055] FIG. 10 is an exemplary diagram showing a state in which a centrifugal fan assembly according to an embodiment of the present invention is installed in a fan housing.

[0056] FIG. 11 is an exemplary cross-sectional view of a centrifugal fan assembly according to an embodiment of the present invention installed in a fan housing.

[0057] FIG. 12 is a graph comparing the static pressure performance of a centrifugal fan assembly according to an embodiment of the present invention and a conventional general Sirocco fan.

[0058] FIGS. 13 and 14 are state diagrams shown to compare the flow field of a centrifugal fan assembly according to an embodiment of the present invention with that of a conventional general Sirocco fan.

[0059] FIGS. 15 and 16 are enlarged views of key parts shown to compare the flow field of a centrifugal fan assembly according to an embodiment of the present invention with that of a conventional general Sirocco fan.

[0060] FIGS. 17 and 18 are state diagrams showing the airflow under fixed-pressure operating conditions of a centrifugal fan assembly according to an embodiment of the present invention and a conventional general Sirocco fan.

[0061] FIGS. 19 and 20 are enlarged views of key parts showing air flow under fixed-pressure operating conditions of a centrifugal fan assembly according to an embodiment of the present invention and a conventional general Sirocco fan.

[0062] FIG. 21 is a plan view of another embodiment of the centrifugal fan of the centrifugal fan assembly of the present invention.

[0063] Embodiments of the present invention are described through exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings.

[0064] In addition, when describing embodiments of the present invention, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0065] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0066] Hereinafter, preferred embodiments of the centrifugal fan of the present invention and a centrifugal fan assembly including the same will be described with reference to the attached FIGS. 1 to 21.

[0067] Figures 1 and 2 attached are perspective views in each direction showing the centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention, and Figure 3 is a plan view showing the centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0068] In addition, FIG. 4 is a cross-sectional view showing a centrifugal fan of a centrifugal fan assembly according to an embodiment of the present invention.

[0069] As illustrated in these drawings, a centrifugal fan assembly according to an embodiment of the present invention includes a plurality of first vanes (110) that function as a Sirocco fan while guiding the discharge of air, and a plurality of second vanes (120) that function as a turbo fan while having a gentler curvature than the first vanes (110). This allows a single centrifugal fan (100) to simultaneously provide the effects of both a turbo fan and a Sirocco fan.

[0070] The centrifugal fan assembly according to the embodiment of the present invention is described in more detail for each component.

[0071] First, a centrifugal fan assembly according to an embodiment of the present invention includes a centrifugal fan (100).

[0072] The above centrifugal fan (100) can be defined as a part, product, or structure that generates air flow while rotating by the driving force of a fan motor (not shown).

[0073] This centrifugal fan (100) includes a base (140). The base (140) can be defined as the bottom portion of the centrifugal fan (100).

[0074] The base (140) includes a hub (141) that receives driving force and a base plate (142) that forms the circumference of the hub (141).

[0075] The hub (141) may be formed in the shape of a dome or a cone that gradually protrudes toward the center. The hub (141) protrudes in the direction in which air is introduced (forward direction). A fan motor is located at the rear of the hub (141), and the motor shaft of the fan motor is coupled to the center of the hub (141) to transmit driving force. Thus, the hub (141) serves as the rotational center of the centrifugal fan (140).

[0076] The above plate (142) is formed to extend radially from the circumference of the hub (141). That is, the above plate (142) can be defined as a portion that extends around the circumference of the hub (141). The above plate (142) can be formed as a circular plate.

[0077] Thus, the base (140) is formed with a hub (141) formed as a curved surface and a base plate (142) formed as a flat surface.

[0078] The above centrifugal fan (100) includes a plurality of vanes (110, 120) made of different shapes.

[0079] The vanes (110, 120) forming the above centrifugal fan (100) include a plurality of first vanes (110).

[0080] The first vane (110) is formed such that a plurality of them are spaced apart from each other along the outer circumference of the base (140) and performs the function of a sirocco fan.

[0081] The first vane (110) above can be formed as a forward-curved vane inclined in the direction of rotation of the centrifugal fan (100). Each of these first vanes (110) has the advantage of being advantageous for high airflow and low noise.

[0082] The first vanes (110) may be provided along the upper circumference of the main plate (142) of the base (140). That is, a plurality of first vanes (110) are formed to be spaced apart from each other along the outer circumference of the main plate (142). By doing so, the first vanes (110) can perform the function of a Sirocco fan.

[0083] The vanes (110, 120) forming the above centrifugal fan (100) include a plurality of second vanes (120).

[0084] The second vane (120) is formed such that a plurality of them are spaced apart from each other along the inner circumference of the base (140) and performs the function of a turbo fan.

[0085] The second vane (120) may be formed as a backward-curved vane inclined in the opposite direction to the rotation direction of the centrifugal fan (100). By each of these second vanes (120), the centrifugal fan has excellent static pressure performance.

[0086] The second vanes (120) may be provided along the upper circumference of the hub (141) of the base (140). That is, a plurality of second vanes (120) are formed to be spaced apart from each other along the outer circumference of the hub (141). Thus, the second vanes (120) can perform the function of a turbofan.

[0087] The second vanes (120) are spaced apart from the first vanes (110) based on the direction in which air is guided. That is, the first vanes (110) and the second vanes (120) are formed separately from each other and are each formed at locations spaced apart from each other in a radial direction from the rotation center (center of the hub) of the centrifugal fan (100).

[0088] Thus, the air flowing into the center of the centrifugal fan (100) can be guided along the second vane (120) and then pass through the first vane (110).

[0089] In addition, the first vane (110) and the second vane (120) are spaced apart from each other in the direction in which the air is guided, so that the functions of a turbo fan (improvement of static pressure performance) and a sirocco fan (increase in wind speed) can be performed sequentially.

[0090] Each vane (110, 120) may be formed differently from each other or positioned at different locations so that the first vanes (110) provide the function of a Sirocco fan and the second vanes (120) provide the function of a turbo fan.

[0091] As an example, each of the first vanes (110) may be provided on the outer circumference of the base (140) and each of the second vanes (120) may be provided on the inner circumference of the base (140).

[0092] As another example, each of the second vanes (120) may satisfy at least one of the following conditions: each second vane (120) is formed to be longer than each first vane (110); the first vanes (110) are provided in greater quantities than the second vanes (120); the distance between the first vanes (110) is formed to be narrower than the distance between the second vanes (120); and the first vane (110) is formed to have a greater curvature than the second vane (120). Preferably, two or more of each of the above conditions may be satisfied.

[0093] That is, a centrifugal fan (100) that simultaneously incorporates the advantages of a Sirocco fan and a turbo fan can be provided by the shape or arrangement structure of each first vane (110) and second vane (120) of the aforementioned embodiment of the present invention.

[0094] Meanwhile, an embodiment of the present invention suggests that the separation of air flow occurring while passing between two second vanes (120) can be reduced while passing through a plurality of first vanes (110).

[0095] To this end, two or more first vanes (110) are arranged within the gap between the leading edges (front end where air is discharged) of two adjacent second vanes (120). That is, the gap between the leading edges of each second vane (120) can be formed wider than the gap between the trailing edges (rear end where air is inflowed) of each first vane (120).

[0096] In addition, since each of the second vanes (120) is formed to bend in the opposite direction to the first vanes (110), the static pressure performance that was lacking with the first vanes (110) can be improved.

[0097] Next, the centrifugal fan assembly according to an embodiment of the present invention includes an orifice (200).

[0098] The above orifice (200) may be defined as a device, part, or structure provided to guide the airflow entering the centrifugal fan (100).

[0099] The above orifice (200) is provided separately from the above centrifugal fan (100).

[0100] Additionally, the orifice (200) is provided in a fixed state. That is, the orifice (200) is fixedly installed on the air flow path, and the centrifugal fan (100) is rotatably installed on the air flow path. For example, as shown in FIGS. 10 and 11, the orifice (200) may be fixedly installed at the intake port (301) of the fan housing (300), and the centrifugal fan (100) may be rotatably installed while positioned to face the intake port (301). At this time, a fan motor (not shown) that drives the centrifugal fan (100) may be fixedly installed outside the fan housing (300). Although not shown, the orifice (200) may be a structure formed integrally with the intake port (301) of the fan housing (300).

[0101] The orifice (200) comprises a ring-shaped flat plate (201) positioned to face the main plate (142) of the base (140) and a bell mouth (202) bent from the inner surface of the flat plate (201) toward the base (140) of the centrifugal fan (100).

[0102] The flat plate (201) can be installed in the fan housing by various methods such as fastening with screws or bolts, hook connection, interlocking connection, attachment, or fusion. Although not illustrated, the flat plate (201) may be part of the fan housing. That is, the orifice (200) may be part of the fan housing.

[0103] The inner diameter of the bellmouth (202) may be formed to be smaller than the outer diameter provided by the hub (141) of the base (140). That is, the orifice (200) is formed to cover at least a portion of the second vane (120).

[0104] As described above, the centrifugal fan assembly generates airflow as the centrifugal fan (100) rotates by the driving of the fan motor. That is, as the centrifugal fan (100) rotates, air from outside the fan housing is guided by the bellmouth (202) of the orifice (200) and flows into the centrifugal fan (100).

[0105] The air introduced into the centrifugal fan (100) flows in a radial direction guided by the second vanes (120). Since the second vanes (120) are formed as rearward vanes, the static pressure performance is increased as the air passes through the second vanes (120).

[0106] Continuing, air flowing radially under the guidance of the second vanes (120) passes through the first vanes (110) provided along the circumference of the centrifugal fan (100) and is discharged to the discharge port (302) of the fan housing (300).

[0107] As described above, the centrifugal fan assembly of the present invention can improve static pressure performance that is insufficient with only the first vanes (110) by additionally forming a second vane (120) for the function of a turbo fan in a conventional sirocco fan having a plurality of first vanes (110).

[0108] In particular, since each of the above second vanes (120) is formed separately and spaced apart from the first vane (110) without being connected to it, defects during molding can be minimized, and precise shape molding (molding of curvature, length, etc.) of each vane (110, 120) becomes possible.

[0109] Meanwhile, in the centrifugal fan assembly of the present invention, the first vane (110) and the second vane (120) are formed to be curved in different directions relative to the rotational direction of the centrifugal fan (100). That is, the first vane (110) is formed as a forward-facing vane structure, whereas the second vane (120) is formed as a backward-facing vane structure, so the air flowing between the first vanes (110) after passing the second vane (120) must undergo a sudden change of direction. As a result, there is a concern that the air flow characteristics may be degraded due to the sudden change of direction between each vane (110, 120).

[0110] Accordingly, the centrifugal fan assembly of the present invention further includes a third vane (130) to assist in changing the direction of air flowing through the second vane (120) to the first vane (110). That is, as shown in FIGS. 5 to 9, the additional provision of the third vane (130) allows the air passing through the second vane (120) to flow more smoothly to the first vanes (110).

[0111] The third vane (130) may be provided between the first vane (110) and the second vane (120). To this end, the first vane (110) and the second vane (120) are spaced apart with a gap sufficient to allow the third vane (130) to be additionally provided. This allows the air passing through the second vane (120) to be guided by the third vane (130) and smoothly change its flow direction toward the first vane (110).

[0112] The third vane (130) may be formed to bend in a direction opposite to at least one of the first vane (110) or the second vane (120). For example, the third vane (130) may be formed as at least one of a forward wing or a backward wing.

[0113] In an embodiment of the present invention, the third vane (130) is formed as a backward wing bent in the opposite direction to the first vane (110).

[0114] In particular, the inclination of the third vane (130) and the inclination of the second vane (120) may be formed differently. For example, when viewed with respect to the radial direction from the center of rotation of the centrifugal fan (100), the angle of inclination from the trailing edge (rear end) to the leading edge (front end) of the third vane (130) is formed to be smaller than the angle of inclination from the trailing edge to the leading edge of the second vane (120). That is, the third vane (130) is formed to have an inclination closer to the radial direction.

[0115] Thus, the third vane (130) is formed with the same backward-facing blade as the second vane (120) but with a larger angle of inclination. As a result, the airflow guided to the leading edge (air outflow side) of the third vane (130) can flow more gently and smoothly into the trailing edge (air inflow side) of the first vane (110) than into the second vane (120). In particular, as the static pressure performance of the centrifugal fan (100) is improved, the outlet flow can be further stabilized.

[0116] The third vane (130) may be formed to have a different curvature from the first vane (110) and / or the second vane (120). For example, the third vane (130) may be formed to have a greater curvature than the second vane (120). That is, the third vane (130) may be formed to change the direction of air flow more abruptly than the second vane (120).

[0117] The third vane (130) may be formed to have a curvature smaller than that of the first vane (110) and larger than that of the second vane (120). Alternatively, the third vane (130) may be formed to have a curvature equal to that of the first vane (110) and larger than that of the second vane (120).

[0118] The number of the third vanes (130) may be formed to be greater than the number of the second vanes (120). That is, two or more third vanes (130) located between two adjacent second vanes (120) may be provided. This reduces or prevents the phenomenon of air flow separation that occurs while flowing to the first vane (110) while being guided by the second vanes (120).

[0119] The number of the third vanes (130) may be formed to be fewer than the number of the first vanes (110). That is, the number of third vanes (130) is less than the number of first vanes (110) located between two adjacent second vanes (120). Thus, rather than increasing the wind speed, the third vanes (130) can achieve a superior effect of increasing wind speed by separating the air guided to the second vanes (120) into multiple groups and guiding it to pass through multiple first vanes (110) arranged at narrower intervals.

[0120] The leading edge, which is the leading side (air outflow side) of the second vane (120), may be formed to face the trailing edge, which is the trailing side (air inflow side) of one of the third vanes (130). At this time, the leading edge of the second vane (120) may be positioned close to the trailing edge of the third vane (130).

[0121] This allows for continuous airflow and prevents turbulence from occurring while the air guided along the second vane (120) flows into the third vane (130).

[0122] The leading edge of the third vane (130) may be formed to face the trailing edge of one of the first vanes (110). At this time, the leading edge of the third vane (130) may be positioned close to the trailing edge of the first vane (110). This allows for continuous airflow and prevents the occurrence of turbulence while the air guided along the third vane (130) flows into the first vane (110).

[0123] The third vane (130) is fixed, and the first vane (110) and the second vane (120) can rotate together with the base (140). To this end, the third vane (130) can be formed in the orifice (200). More specifically, the third vanes (130) can be formed to protrude toward the base (140) from the surface of the flat plate portion (201) forming the orifice (200) that faces the base (140) of the centrifugal fan (100).

[0124] Thus, each vane (110, 120, 130) of the embodiment of the present invention can form a multi-stage arrangement, and superior static pressure performance can be obtained. Air guided to the second vane (120) by the rotation of the centrifugal fan (100) can smoothly pass between the first vanes (110) by being guided by the third vane (130).

[0125] The spacing between the area where the first vanes (110) are formed and the area where the second vanes (120) are formed can be formed by taking into account the length of the third vane (130). The third vane (130) is formed to be equal to or longer than the length of the first vane (110) and shorter than the second vane (120).

[0126] Thus, the centrifugal fan assembly according to another embodiment of the present invention can provide even better static pressure performance by providing a third vane (130) that is fixed together with the orifice (200). That is, the flow passing through a single centrifugal fan (100) is compressed in multiple stages, thereby providing even better static pressure performance.

[0127] In addition, by providing a third vane (130), air passing through the second vane (120) can be smoothly guided between each first vane (110), thereby enabling an increase in the discharge air velocity.

[0128] The third vane (130) is formed to have a length such that it does not touch the base (140). Thus, the third vane (130) remains fixed, and only the first vane (110) and the second vane (120) can be rotated together with the base (140) by the driving force of the motor.

[0129] Meanwhile, the graph in the attached Figure 12 shows the relationship between airflow and pressure of a conventional Sirocco fan and the relationship between airflow and pressure of the centrifugal fan assembly of the present invention. As can be seen from this graph, the static pressure performance of the centrifugal fan assembly of the embodiment of the present invention (① in the drawing) is improved by approximately 15% compared to the conventional Sirocco fan (② in the drawing).

[0130] Additionally, FIGS. 13 and 14 show the pressure state during operation of a conventional Sirocco fan, and FIGS. 15 and 16 show the pressure state during operation of a centrifugal fan assembly of an embodiment of the present invention. As can be seen from each of these figures, the centrifugal fan assembly of an embodiment of the present invention provides a higher discharge static pressure than a conventional Sirocco fan. At this time, FIG. 14 is an enlarged view of the key part of the area where the vane of FIG. 13 is located, and FIG. 16 is an enlarged view of the key part of the area where each vane of FIG. 15 is located.

[0131] In addition, FIG. 17 shows the air flow state under fixed-pressure operating conditions of a conventional Sirocco fan, and FIG. 18 shows the air flow state under fixed-pressure operating conditions of a centrifugal fan assembly of an embodiment of the present invention. As can be seen from these two figures, under fixed-pressure operating conditions of a conventional Sirocco fan, air backflow occurs and the wake is unstable, whereas under fixed-pressure operating conditions of a centrifugal fan assembly of an embodiment of the present invention, the wake is stabilized.

[0132] In addition, FIGS. 19 and 20 respectively show the discharge speed of a conventional Sirocco fan and a centrifugal fan assembly of an embodiment of the present invention. As can be seen from these two figures, the discharge speed of the centrifugal fan assembly of an embodiment of the present invention is further increased compared to the conventional Sirocco fan.

[0133] Meanwhile, the centrifugal fan assembly of the present invention may also be implemented in a form different from that shown in FIGS. 1 to 11.

[0134] As an example, as shown in the attached FIG. 21, if the third vane (130) is not provided, the first vane (110) and the second vane (120) may be formed to be positioned so that the distance between their ends is as close as possible.

[0135] In this case, the phenomenon of air separation between the first vane (110) and the second vane (120) can be minimized.

[0136] As another example, although not shown, the first vane (110) may be formed in the orifice (200) together with the third vane (130).

[0137] As another example, although not shown, the second vane (120) and the third vane (130) may be formed in the centrifugal fan (100), and the first vane (110) may be formed in the orifice (200).

[0138] As such, the centrifugal fan assembly of the present invention can be implemented in various forms.

[0139] In the foregoing, although all components constituting an embodiment according to the present invention have been described as being combined or operating in combination, the present invention is not necessarily limited to such embodiments. That is, within the scope of the purpose of the present invention, all such components may be selectively combined in one or more ways to operate. Furthermore, terms such as "include," "constitute," or "have" described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Terms commonly used, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in the present invention, should not be interpreted in an ideal or overly formal sense.

[0140] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. Bass; A plurality of first vanes spaced apart along the outer perimeter of the base; A plurality of second vanes spaced apart along the inner circumference of the base and guiding air flow to the first vanes; A centrifugal fan assembly in which the first vane and the second vane are spaced apart from each other in the direction in which air is guided.

2. In Paragraph 1, The above second vane is formed to be longer than the above first vane in a centrifugal fan assembly.

3. In Paragraph 1, A centrifugal fan assembly in which the total quantity of the first vanes is greater than the total quantity of the second vanes.

4. In Paragraph 1, A centrifugal fan assembly in which the first vane is formed to have a greater curvature than the second vane.

5. In Paragraph 1, The above first vanes are a centrifugal fan assembly provided in multiple numbers within the gap between the rear ends of each second vane.

6. In Paragraph 1, A centrifugal fan assembly in which the spacing between the rear ends of each of the second vanes is formed wider than the spacing between the front ends of each of the first vanes.

7. In Paragraph 1, A centrifugal fan assembly in which each of the first vanes and the second vanes are formed to bend in opposite directions.

8. In Paragraph 1, The above base is, A hub that receives driving force while forming a center of rotation, and A centrifugal fan assembly including a main plate extending radially from the circumference of the hub.

9. In Paragraph 8, The first vanes are centrifugal fan assemblies provided along the circumference of the main board.

10. In Paragraph 8, The above second vanes are centrifugal fan assemblies provided along the circumference of the hub.

11. In Paragraph 1, A centrifugal fan assembly in which a third vane is further provided between the first vane and the second vane.

12. In Paragraph 11, A centrifugal fan assembly in which the third vane is formed to bend in the opposite direction to the first vane.

13. In Paragraph 12, A centrifugal fan assembly in which the third vane is formed to have a smaller curvature than the first vane.

14. In Paragraph 12, A centrifugal fan assembly in which the third vane is formed to have a greater curvature than the second vane.

15. In Paragraph 11, The above third vane is provided in a centrifugal fan assembly with fewer vanes than the above first vanes.

16. In Paragraph 11, The above third vane is a centrifugal fan assembly provided in greater quantities than the above second vanes.

17. In Paragraph 11, A centrifugal fan assembly in which the leading end of the second vane is formed to face the rear end of the second vane.

18. In Paragraph 11, A centrifugal fan assembly in which the leading end of the third vane is formed to face the rear end of the first vane.

19. In Paragraph 11, A centrifugal fan assembly further comprising an orifice positioned to face the base in the axial direction and having an air intake formed on the radially inner side.

20. In Paragraph 19, The above third vane is a centrifugal fan assembly provided to the above orifice.

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