KR20070000895A - Turbo fan - Google Patents

Abstract

A turbo fan is provided to increase the amount of blown air even the axial height is small to install the turbo fan in a small space. A turbo fan includes a hub(52), a shroud(54), and a plurality of blades(56). A motor shaft is connected to the inner peripheral end of the hub to transfer power. The shroud guides sucked air from the axial direction to the radial direction. The plurality of blades blow the sucked air so that the sucked air can be discharged radially. The thickness of the outer peripheral end of the shroud is thinner than the thickness of the inner peripheral end thereof so that the outer end of the blade is higher than the height of the inner end thereof.

Description

Turbo Fan {TURBO FAN}

1 and 2 are a perspective view and an exploded perspective view showing an indoor unit for a frame-type air conditioner to which the turbofan is applied according to the present invention;

3 is a side view of a portion of the turbofan in part A of FIG. 2, FIG.

Figure 4 is a graph showing the suction flow rate and noise during operation of the turbofan in the prior art and the present invention.

<Explanation of symbols on main parts of the drawings>

10: case 12: air guide

14a, 14b, 14c: discharge grill 16: air filter

20: front panel 30: evaporator

32: drain pan 40: orifice

42: guide hole 44: control box

46: operation button 50: turbo fan

52: Hub 54: Shroud

56: blade 60: motor

62: motor shaft 64: elastic material

66: motor support

The present invention relates to a turbo fan that sucks air in an axial direction and discharges it in a radial direction. More particularly, the present invention relates to a turbo fan that can increase an air volume even if the axial height is small so that the air can be installed in a small space. .

In general, a turbo fan sucks air in an axial direction and discharges it in a radial direction. However, even when the height is low, the turbo fan has a relatively large amount of airflow, but the flow resistance is large as the flow is rapidly changed to 90 °, resulting in large noise. Such a turbofan is used in a indoor unit for a ceiling type air conditioner or an indoor unit for a frame type air conditioner because the installation amount is limited because the amount of air flow is large compared to the size of the fan itself.

Recently, the indoor unit for the frame type air conditioner is not only beautiful in terms of design, but also occupies a small installation space. Such an indoor unit for the frame type air conditioner is installed at the front of the thin rectangular parallelepiped case at the same time as the front panel on which various pictures are drawn. An evaporator and a turbo fan are built inward.

Specifically, looking at the configuration of the indoor unit for the frame-type air conditioner, the front panel is installed to open and close the front of the case is open, the inlet is formed between the case and the front panel at the same time the discharge port on both sides and bottom of the case Is formed, the case is installed so that the evaporator, the turbo fan and the motor overlap the inner orifice is installed to guide the flow of air between the evaporator and the turbo fan.

In particular, the turbofan is composed of a hub connected to the motor for transmitting power and a ring-shaped shroud spaced apart from the shaft, and a plurality of blades arranged in the circumferential direction therebetween, The wood is installed facing the front panel.

Accordingly, as the turbo fan is operated, indoor air is sucked axially through the suction port, and the indoor air is cooled through heat exchange with a refrigerant while passing through the evaporator, and then sucked into the turbo fan by the orifice. The flow is guided.

Thereafter, the suction flow guided in the axial direction by the orifice flows radially through the shroud, the blade and the hub of the turbofan and is discharged through each discharge port.

However, in the conventional turbofan applied to the indoor unit for the frame type air conditioner as described above, the height of the blade installed between the shroud and the hub is limited as the installation space is limited. As it is proportional to the height of the blade, the height of the blade that actually blows air is not only reduced, but also limited to increase the amount of blown air. Even slight shaking may cause problems such as damage and noise caused by collision with surrounding components.

The present invention has been made to solve the above problems of the prior art, it is an object of the present invention to provide a turbo fan that can prevent the collision with other components while increasing the air flow rate even if installed in a limited space in the axial direction.

Turbo fan according to the present invention for solving the above problems is connected to the inner peripheral end of the motor shaft, the hub and the power, and the inner circumferential end and the outer circumferential end is formed gently between the hub and the axially spaced position is suction A shroud for guiding air radially from the axial direction, and a plurality of blades spaced in the circumferential direction so as to be perpendicular between the outer circumferential end of the hub and the outer circumferential end of the shroud so as to blow intake air radially; In the turbo fan, the outer circumferential end thickness of the shroud is formed thinner than the inner circumferential end thickness so that the outer end of the blade is larger than the inner end.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and an exploded perspective view showing an indoor unit for a frame-type air conditioner to which the turbofan is applied according to the present invention, and FIG. 3 is a side view showing a part of the turbofan in part A of FIG. 2.

The indoor unit for the frame-type air conditioner to which the turbo fan is applied according to the present invention has a thin case 10 having a discharge opening formed at both sides and a bottom surface thereof at the same time as the front surface is opened to form an intake port, and the A front panel 20 installed on the front of the case 10 so as to be opened and closed, an evaporator 30 built in the case 10 and a refrigerant circulated therein, and located on a rear surface of the evaporator 30 and the evaporator 30 The orifice 40 which guides the cool air passing through the axial direction and partitions the suction flow and the discharge flow, and is located on the rear of the orifice 40 to generate a blowing force to suck the indoor air from the suction port to the evaporator ( 30, and then includes a turbo fan 50 and a motor 60 for discharging to the discharge port.

Of course, such an indoor unit 100 is installed to be connected to an outdoor unit (not shown) including an expansion unit such as a compressor, a condenser, a capillary tube, or an electronic expansion valve, and the refrigerant is connected to the compressor, the condenser, the expansion unit, and the evaporator 30. At the same time, the indoor air and outdoor air are blown to pass through the evaporator 30 and the condenser, respectively.

In more detail, looking at each component of the indoor unit 10, the case 10 is formed in the shape of a thin rectangular parallelepiped with the front open to form a receiving space for the various components therein, the inner corner The air guide 12 may be integrally formed to guide the suction flow flowing by the turbo fan 50.

In this case, the front panel 20 is installed to open and close so that internal components are not visible on the front of the case 10 and can block noise, so that indoor air is sucked when the front panel 20 is opened. Discharge grills 14a, 14b, and 14c are installed on both side surfaces and the bottom surface of the case 10 to control the discharge direction, so that cold air is discharged through the discharge grills 14a, 14b and 14c.

In addition, an air filter 16 and a dust collector (not shown) are installed inside the front surface of the case 10 to filter dust and the like from the sucked indoor air, so that the air filter 16 and the dust collector can be cleaned. It is detachably mounted.

At this time, the air filter 16 is installed to slide between the guide projections (not shown) formed on both inner sides of the front of the case 10 is operated to filter foreign matter such as dust from the intake air, the dust collector It is installed to be fixed to the front of the air filter 16 is operated to collect dust and the like during power supply.

Next, the front panel 20 is installed so that the lower end is hinged to the front lower side of the case 10 so that the upper end can be opened and closed at a set angle, the hinge shaft is connected to the step motor (not shown) on both lower ends Can be opened and closed automatically.

At this time, the front panel 20 is positioned so as to have a gap from the front of the case 10, so as not to interfere with the front of the case 10, even when opened and closed around the bottom.

Of course, the front panel 20 is composed of at least one panel may be installed so that each panel is horizontally installed and opened and closed at a set angle at the same time.

Next, the evaporator 30 is connected to the compressor, condenser, expansion means of the outdoor unit to configure a refrigeration cycle, a plurality of fins are installed in the refrigerant pipe is installed inside the case 10 front, The refrigerant passing through the refrigerant pipe causes heat exchange with the indoor air by a plurality of fins to generate cold air.

Of course, the evaporator 30 is formed in a thin rectangular parallelepiped shape so that the evaporator 30 may be installed inside the case 10, and the front shape is formed in a square shape like the case 10.

Next, the orifice 40 is formed with a guide hole 42 in the center convex ring shape to guide the suction air to the center of the turbo fan 50 so that turbulence does not occur, the portion other than the guide hole 42 Is formed flat to partition the cold air sucked into the turbo fan 50 and the cold air discharged through the turbo fan 50.

Mainly, the control box 44 for controlling the operation of the turbo fan 50 and the front panel 20 is installed on the front side of the orifice 40, and the motor for driving the turbo fan 50 ( 60) and control the power supplied to the step motor (not shown) for opening and closing the front panel 20 at a set angle, and also controls the power supplied to the dust collector.

Of course, the control box 44 is directly connected to various operation buttons 46 so that the user can directly operate the indoor unit, or configured to receive an operation control signal from a remote control, etc. It controls the operation of, and further connected to the display (not shown) to display the operating state of the indoor unit directly through the display unit for the user to see.

Next, the turbo fan 50 is to suck the indoor air in the axial direction so as to pass through the evaporator 30 to discharge in the radial direction, the thickness is formed so thin that it can also be installed inside the case (10) On the other hand, it is preferable to form a larger diameter in order to increase the suction wind direction.

At this time, the turbo fan 50 is positioned so as to be spaced apart in the center of the disc-shaped hub 52 and the hub 52 in the axial direction so as to be connected to the motor 60, the shaft to guide the suction flow A ring-shaped shroud 54 gently slanted in a direction, and a plurality of blades 56 positioned at regular intervals in a circumferential direction between the hub 52 and the shroud 54, wherein the shra The wood 54 guides the suction flow in the axial direction, while the hub 52 and the blade 56 guide the discharge flow in the radial direction.

In addition, since the turbofan 50 has a large diameter and a thin thickness, shaking may occur due to factors such as unbalanced operation, external impact, and the like, and thus, the turbofan 50 may encounter an adjacent component such as the orifice 40. It is installed at a predetermined interval with the orifice 40 in order to prevent it, an interference preventing groove (not shown) is formed at the end of each blade 56 of the shroud side located close to the guide hole 42 of the orifice Be sure to

Of course, the interference preventing groove is formed small so as not to affect the blowing efficiency and the blowing amount during the operation of the turbo fan 50, the repetitive experiment results the depth of the interference preventing groove is less than 10% of the height of the blade 56 It is preferable that it is formed to be.

Therefore, even if the turbo fan 50 is installed close to the orifice 40 in a space limited in the axial direction, the turbo fan 50 and the orifice 40 can be maintained at a constant interval by the interference preventing groove, The guide hole 42 of the orifice may be installed to be partially inserted into the turbo fan 50, thereby further reducing the axial installation space of the turbofan 50 and the orifice 40, and further, the orifice 40. The suction flow guided by) may directly flow into the turbo fan 50 to minimize the loss of the suction flow, thereby increasing the suction efficiency and reducing the noise.

In particular, the turbo fan 50 has an outer circumferential end of the hub 52 and an outer circumferential end of the shroud 54 in the axial direction than the inner circumferential end of the hub 52 and the inner circumferential end of the shroud 54, respectively. As the thickness (Th, Ts) is formed to be thinner, the height of the blade 56 is formed at the outer end than the inner end therebetween, thereby the blade 56 than the inner end height of the blade 56 Is formed so that the outer end height of the is higher.

At this time, even if each of the thickness (Th, Ts) of the hub 52 and the shroud 54 is formed thinner at the outer circumferential end than the inner circumferential end, the hub 52 and so as to stably fix the blade 56 Each outer peripheral thickness (Th, Ts) of the shroud 54 is to maintain 60 to 80% in each inner peripheral thickness.

Of course, each of the thicknesses Th and Ts of the hub 52 and the shroud 54 may be formed to become thinner from the inner circumferential end to the outer circumferential end, or may be formed to be stepped at least once, or the hub 52. However, only the shroud 54, both the hub 52 and the shroud 54 may be formed thinner at the outer circumferential end than the inner circumferential end.

Therefore, even if the turbo fan 50 is manufactured in a limited axial height in order to install in an installation space limited in the axial direction, the hub 52 and the shroud 54 have a thickness (Th, As Ts) becomes thinner, the height of the blade 56 is higher at the outer end than the inner end, and thus the size of the blade 56 is larger than before, so that the amount of air blown by each blade 56 Can be increased.

On the other hand, in the turbo fan 50 as described above, in terms of blowing efficiency, the inner diameter of the shroud 54 is preferably larger than the outer diameter of the hub 52, but a pair of molds are engaged therebetween. Since the shroud 54, the hub 52 and the blade 54 is integrally injection molded, the inner diameter of the shroud 54 is at least equal to the outer diameter of the hub 52 due to a mold manufacturing problem , Larger.

Next, the motor 60 is installed on the rear side of the turbo fan 50 so that the motor shaft 62 is fitted to the hub 52 to transmit power to the turbo fan 50, but the motor shaft An elastic material 64 is installed between the 62 and the hub 52 to absorb the vibration as well as to buffer the power transmission.

Of course, the turbo fan 50 is installed so that the shroud 54 faces the front surface of the case 10, and the motor 60 is attached to the motor support 66 on the inner rear surface of the case 10. It is installed to be fixed by.

Figure 4 is a graph showing the suction flow rate and noise during operation of the turbofan in the prior art and the present invention.

Looking at the suction flow rate and the noise in the conventional turbofan and the turbofan of the present invention respectively applied to the indoor unit for the frame-type air conditioner as described above, as shown in Figure 4 the thickness of the hub and the shroud as well as the height of the blade The thickness of the hub 52 and the shroud 54, Th and Ts of the hub 52 and the shroud 54 is not only thinner at the outer circumferential end but also the height of the blade 56 is also higher at the outer end than the conventional turbofan. In the turbo fan 50 of the noise is about 2dB, that is, about 5% of the total noise is reduced, this phenomenon is the same even if the noise increases as the suction flow increases.

That is, when the conventional turbofan and the turbofan 50 of the present invention generate the same suction flow rate, the noise can be further reduced in the turbofan 50 of the present invention than the conventional turbofan, while the conventional turbofan And when the same noise is generated in the turbo fan 50 of the present invention, it is possible to increase the suction flow rate in the turbo fan 50 of the present invention more than the conventional turbo fan.

In the above, the present invention has been described in detail by taking a turbo fan applied to the indoor unit for the frame type air conditioner based on the embodiments of the present invention and the accompanying drawings as an example. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

In the turbofan according to the present invention configured as described above, the thickness of each hub and shroud is thinner at the outer circumferential end than the inner circumferential end, so that the axial height of the plurality of blades installed between the hub and the shroud is the outer end than the inner end. Since the fan itself does not increase in size, it is possible to increase the air volume as well as reduce the airflow, but also reduce the noise. Even if it is installed in close proximity, an interference prevention groove is formed at one end of the blade to maintain a certain distance from the orifice, so that the turbofan with a large diameter and a low height prevents collision with the orifice even if it is shaken by unbalanced operation or external impact. There is an advantage in reducing fan damage and noise generation.

Claims (9)

A hub that the motor shaft is connected to the inner circumferential end to transmit power, A shroud that is gently formed between the inner circumferential end and the outer circumferential end at a position spaced axially from the hub to guide suction air radially from the axial direction; In the turbo fan comprising a plurality of blades installed in the circumferential direction so as to be perpendicular to the outer circumferential end of the hub and the outer circumferential end of the shroud to blow the suction air in a radial direction, Turbo outer fan characterized in that the outer peripheral end thickness of the shroud is formed thinner than the inner peripheral end thickness is greater than the inner end of the blade. The method of claim 1, The shroud is formed so that the thickness gradually becomes thinner from the inner circumferential end to the outer circumferential end, the turbo fan, characterized in that the height becomes larger toward the outer end from the inner end of the blade. The method of claim 2, The shroud is a turbo fan, characterized in that the outer peripheral thickness is formed to be 60 ~ 80% of the inner peripheral thickness. The method of claim 3, wherein Turbo hub, characterized in that the outer peripheral end thickness of the hub is formed thinner than the inner peripheral end thickness is greater than the inner end of the blade. The method of claim 4, wherein The hub is formed so that the thickness gradually becomes thinner from the inner circumferential end to the outer circumferential end, the turbo fan, characterized in that the height increases from the inner end of the blade to the outer end. The method of claim 5, The hub is a turbo fan, characterized in that formed so that the outer peripheral thickness is 60 ~ 80% of the inner peripheral thickness. The method according to any one of claims 1 to 6, The turbo fan is characterized in that the orifice for guiding the suction flow is installed in close proximity to the shroud, and the interference prevention groove is formed in the blade end of the shroud side to maintain a predetermined distance from the blade even if the turbo fan is vibrated. Turbofan. The method of claim 7, wherein The interference preventing groove is a turbo fan, characterized in that the depth is formed to be less than 10% of the height of the blade. The method of claim 8, And the inner diameter of the shroud is at least equal to or larger than the outer diameter of the hub so that the shroud, the hub and the blade can be integrally formed.

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