KR101419943B1 - Air conditioner and Fan assembly thereof - Google Patents

Abstract

The present invention relates to an air conditioner and a fan assembly of an air conditioner.

According to the fan assembly of the air conditioner and the air conditioner according to the embodiment of the present invention, the phenomenon of disturbance of the flow of the room air sucked in the process of rotating the centrifugal fan is eliminated, and the pressure of the air, There is an effect of maintaining the uniformity.

Fans, blades, hubs

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fan assembly for an air conditioner and an air conditioner,

The present invention relates to an air conditioner and a fan assembly of an air conditioner.

The air conditioner is a device that keeps the room air temperature lower or higher than the outdoor temperature through heat exchange between the refrigerant and the room air.

In detail, the inside of the air conditioner is provided with a refrigerant cycle, and a phase-change refrigerant and outside air are heat-exchanged through the refrigerant cycle. The refrigerant cycle includes a compressor for compressing the refrigerant at a high temperature and a high pressure, a condenser for exchanging heat with the outdoor air through the refrigerant passed through the compressor, an expansion valve for expanding the refrigerant passing through the condenser at a low temperature and a low pressure, And an evaporator in which a refrigerant exchanges heat with indoor air. Here, when the air conditioner is used as a cooler, the condenser corresponds to an outdoor heat exchanger, and the evaporator corresponds to an indoor heat exchanger.

More specifically, in the case of an air conditioner for air conditioning, the evaporator is mounted on an indoor unit, and the condenser is mounted on an outdoor unit. The compressor and the expansion valve are mounted on the outdoor unit.

Generally, an air conditioner can be divided into an integrated air conditioner in which a condenser and an evaporator are housed in a single case, and a separate type air conditioner in which a condenser and an evaporator are housed in separate cases. The indoor unit of the air conditioner is classified into a standing type, a wall-mounted type, and a ceiling type according to the installation mode, and classified into cooling, heating, and cooling and heating depending on functions.

1 is a side view of a fan installed in a conventional ceiling-type air conditioner indoor unit.

Referring to FIG. 1, a fan 1 installed in a conventional ceiling-type air conditioner indoor unit is a turbo fan, which comprises a hub 4, a plurality of blades 3 extending on the outer circumferential surface of the hub 4, And a bell mouth (2) which is seated on the upper end of the blade (3) to guide air inflow.

In detail, the hub 4 has a conical shape having a larger horizontal cross section as it goes downward. The blade 3 has a shape radially extending from the lower outer circumferential surface of the hub 4 with a predetermined height and length It accomplishes. The blade 3 has a structure curved at a predetermined curvature while extending outwardly from the hub 4. Therefore, the air sucked in the axial direction of the hub 4 is discharged in a direction orthogonal to the rotary shaft, and is deflected by the shape of the blade 3.

In the conventional fan 1, the lower end of the blade 3 extends further downward than the lower end of the hub 4. An extension line passing through the lower end of the blade 30 and a rotation axis of the fan 2 are orthogonal to each other.

Due to the above structure, the flow of air discharged to the lower end of the blade 30 is disturbed and a flow resistance is generated.

Also, air flow noise is generated between the base panel on which the fan 1 is mounted and the lower end of the blade 30, and the flow noise is transmitted to the outside of the indoor unit through the base panel. Therefore, there is a problem that the user feels inconvenience due to the noise generated due to the start of the indoor unit.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a fan assembly capable of reducing the flow resistance and flow noise generated during fan rotation by improving the structure of the blades constituting the centrifugal fan, And to provide a harmonizer.

According to an aspect of the present invention, there is provided a fan assembly for an air conditioner and an air conditioner, comprising: a hub having a horizontal cross-sectional diameter increasing toward a lower end; A plurality of blades arranged on an outer periphery of the hub, and a bell mouth seated on an upper end of the blade, wherein a lower end of the blade is cut obliquely with respect to a center axis of the hub.

According to another aspect of the present invention, there is provided a fan assembly for an air conditioner and an air conditioner, comprising: a hub having a horizontal cross-sectional diameter increasing toward a lower end; A plurality of blades arranged on an outer periphery of the hub, and a bell mouth seated on an upper end of the blade, wherein a diameter of a lower end of the hub is smaller than or equal to an inner diameter of the bell mouth.

According to the fan assembly of the air conditioner and the air conditioner according to the embodiment of the present invention, the disturbance of the flow of the room air sucked in the centrifugal fan rotation is eliminated, The air pressure and air volume can be uniformly maintained.

In addition, the phenomenon that the inhaled indoor air flows into the space between the blades and the base panel and generates the flow noise is reduced, and the overall driving noise of the indoor unit is reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It is to be understood that the spirit and scope of the present invention are not limited to the embodiments and drawings, and that various changes, additions and deletions may be made within the scope of the present invention.

2 is an exploded perspective view of an indoor unit of a ceiling-type air conditioner according to an embodiment of the present invention.

Hereinafter, to describe the structure of the indoor unit of the air conditioner according to the embodiment of the present invention, a portion where the room air inlet is formed is defined as an upper surface and a portion where the fan assembly is seated is defined as a lower surface.

2, the indoor unit 10 of the ceiling-type air conditioner according to the embodiment of the present invention includes a cabinet 11 surrounding the exterior of the cabinet 11, A base 12 attached to a bottom surface of the case 12 and a heat exchanger 14 provided inside the case 12 and spaced inwardly from the case 12 A drain pan mounted on the upper side of the heat exchanger 14 and receiving condensed water formed on a surface of the heat exchanger 14; A control box 21 mounted on an edge of the shroud 22 and provided in the inside of the drain pan 15 for guiding indoor air suction; And a front panel 18 which is seated on the upper side of the case 15 and covers the case 12. [

In detail, the heat exchanger 14 functions as an evaporator in a cooling mode. The fan assembly includes a fan motor 17 and a blowing fan 16 connected to the rotary shaft of the fan motor 17 to draw indoor air while rotating. The air blowing fan 16 may be a centrifugal fan that sucks air in the axial direction and discharges the air in a radial direction, and a turbo fan can be applied thereto. The fan motor 17 is fixedly mounted on the base 13 by a motor mount.

A suction grill 19 for sucking indoor air is mounted on the front panel 18 and a filter 20 for purifying indoor air sucked is mounted on the bottom surface of the suction grill 19. On the four sides of the front panel 18, a discharge port 182 through which the inhaled indoor air is discharged is provided, and the discharge port 182 is selectively opened and closed by the louver 181.

A depression 152 is formed in the bottom surface of the drain pan 15 to receive the lower end of the heat exchanger 14. In detail, the depressed portion 152 is a space in which the condensed water generated on the surface of the heat exchanger 14 is dropped and accumulated, and a drain pump (not shown) for draining the condensed water is mounted on the depressed portion 152. A discharge port 151 having a predetermined length is formed at a position apart from the depression 152. Accordingly, the room air sucked by the blowing fan 16 is cooled while passing through the heat exchanger 14, and then is discharged to the room again through the discharge port 151. [ The cooling air having passed through the discharge port 151 is discharged to the room through the discharge port 182 of the front panel 18.

An orifice 22 is formed at an inner side of the shroud 22 so as to minimize a flow resistance in the process of sucking indoor air. The orifice (22) extends in a cylindrical shape in the direction of the blowing fan (16).

The case 12 may be made of a heat insulating material such as styrofoam, and the cabinet 11 may be made of a metal plate to reinforce the strength of the case 12. The base 13 is made of a metal plate so as to support the fan motor 17, and a forming portion for reinforcing the strength is formed.

FIG. 3 is a side view of a blowing fan constituting an air conditioner according to an embodiment of the present invention, FIG. 4 is a bottom perspective view of the blowing fan, and FIG. 5 is a partial side sectional view of the blowing fan.

3 to 5, the air blowing fan 16 constituting the indoor unit of the air conditioner according to the embodiment of the present invention, particularly the indoor unit of the ceiling type air conditioner, sucks indoor air in the axial direction, A centrifugal fan to be discharged can be applied. In particular, a turbo fan belonging to a centrifugal fan can be applied.

More specifically, the blowing fan 16 is provided with a worm-type hub 161 having a larger diameter toward the lower end, a blade 162 arranged at a predetermined interval on the outer circumferential surface of the hub 161, And a bell mouth 163 which is seated on the top.

More specifically, the upper end of the hub 161 is formed lower than the upper end of the blade 162, and the rotation shaft of the fan motor is coupled to the bottom of the upper end of the hub 161. The blade 162 extends radially from the center of the hub 161 at a predetermined distance from the center of the hub 161, and is bent in a cyclone shape toward the outer side.

The bell mouth 163 is formed to be rounded to the outside of the hub 161. Accordingly, the indoor air sucked through the orifice formed at the central portion of the shroud 22 is guided to be radially discharged along the hub 161 and the blade 162.

Meanwhile, the lower end of the blade 162 is cut at a predetermined angle? With respect to the horizontal plane in a state where the blowing fan 16 is mounted. 5, the lower end of the blade 162 extends in a direction similar to the lower end of the hub 161. As shown in FIG. Accordingly, the air discharged along the surface of the hub 161 is smoothly guided along the lower end of the blade 162.

In addition, since the lower end of the blade 162 is sloped, flow noise due to air introduced into the space between the lower end of the blade 162 and the base 13 is reduced.

The air introduced into the space between the hub 161 and the base 13 is blown into the space between the hub 161 and the base 13 when the lower end of the blade 162 is further extended from the bottom surface of the hub 161 and cut horizontally, 161 and the lower end of the blade 162 extending downward.

However, as shown in the present invention, when the lower end portion of the blade 162 is sloped and the portion extending from the bottom surface of the hub 161 is minimized, air introduced between the hub 161 and the base 13 It is possible to obtain an effect that the flow noise is reduced because it is not swept by the lower end of the blade 162. [

Meanwhile, in order to reduce the noise of the present invention, it is also possible that the lower end of the blade 162 is blended as shown in part A of FIG.

Specifically, the lower end portion of the blade 162, particularly the inner edge portion, is shaped into a smoothly rounded shape as shown.

As described above, when the lower end of the blade 162 is smoothly rounded by the blending process, the flow resistance to the air radially discharged along the hub 161 is minimized. Further, the flow resistance of the air is reduced, and the flow noise generated when the air collides with the blade 162 is reduced.

As another method for reducing the flow resistance and the flow noise, a method of convex rounding is applicable in addition to the case where the lower end face of the blade 162 is cut so as to form a plane.

In other words, the surface passing through the lower end surface of the blade 162 is a curved surface rather than a flat surface. If the lower end surface of the blade 162 is formed to be recessed inward, the air introduced into the depressed portion may instantaneously induce eddy phenomenon and generate a flow resistance. Conversely, when the lower end surface of the blade 162 is convexly rounded outward, the air falling along the surface of the blade 162 is prevented from causing eddy phenomena, and the flow resistance can be reduced.

In addition, the inclination angle of the lower end of the blade may be variously set according to the type of the fan and the shape of the hub, but it will be common when the inclination angle is 90 degrees or more with the rotation axis of the blowing fan 16.

Alternatively, the tangent line passing through the lower end of the hub 161 and the lower end surface of the blade 162 may be configured to extend in parallel.

Meanwhile, the blowing fan 16 according to the embodiment of the present invention can be applied to a structure in which the hub 161, the blade 162 and the bellmouth 163 are integrally injection-molded.

In detail, the diameter of the lower end of the hub 161 is formed to be smaller than or equal to the inner diameter of the bell mouth 163 so that the components can be injection-molded integrally. Therefore, the inner portion of the blade 162 is formed integrally with the hub 161, and the remaining portion extends further outward from the lower end of the hub 161.

When the lower end of the blade 162 is cut obliquely, the inner lower end of the blade 162 is flush with the bottom of the hub 161, and the lower end of the blade 162 is lower than the bottom of the hub 161 So that it can be extended further. Alternatively, the inner lower end of the blade 162 may be sloped in a state slightly protruding from the bottom surface of the hub 161.

1 is a side view of a fan installed in a conventional ceiling-type air conditioner indoor unit.

FIG. 2 is an exploded perspective view of an indoor unit of a ceiling-type air conditioner according to an embodiment of the present invention; FIG.

3 is a side view of a blowing fan constituting an air conditioner according to an embodiment of the present invention.

4 is a bottom perspective view of the blowing fan.

5 is a partial side sectional view of the blowing fan.

Claims (11)

A hub having a larger horizontal cross-sectional diameter toward the lower end; A plurality of blades arranged on an outer periphery of the hub; A bell mouth that rests on the top of the blade, Wherein a lower end of the blade is cut obliquely with respect to a center axis of the hub and extends obliquely at a set angle &thetas; Wherein the setting angle (?) Is smaller than 90 degrees. The method according to claim 1, Wherein an angle between a lower end of the blade and a center axis of the hub is greater than 90 degrees. The method according to claim 1, Wherein a lower end surface of the blade is flat. The method according to claim 1, Wherein the lower end surface of the blade is a convexly curved surface. The method according to claim 1, And a lower end of the blade is blended. The method according to claim 1, Wherein a diameter of a lower end of the hub is smaller than or equal to an inner diameter of the bell mouth. delete The method according to claim 1, Wherein an inner lower end of the blade is flush with a bottom surface of the hub or is protruded from a bottom surface of the hub. The method according to claim 1, Wherein a portion of the lower end surface of the blade is integrally formed with the hub and the remaining portion extends further outward from the lower end of the hub. The method according to claim 1, And the inner lower end of the blade is curved at a predetermined curvature. An air conditioner comprising the fan assembly according to claim 1.

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