KR20070090396A - Blower - Google Patents

Abstract

A fan is provided to minimize the resistance of a flow in the air due to a hub boss by allowing one surface of the shroud of the hub boss to be formed smooth. A fan includes a hub(80), a shroud(82), and a plurality of blades(84). The hub is connected to a motor of the fan. The shroud is separated from the hub to the direction of the axis of the fan. The plurality of the blades is formed between the shroud and the hub. The perimeter edge of each blade formed as the shape of a step to be different in an axial direction of the fan. The diameter of the blade gradually decreases from the shroud to the hub. An inner end of each blade is a rear collar type and an external end of each blade is a front collar type. The outer diameter of each blade is larger than the diameter of the hub.

Description

Fan {Blower}

1 is an external perspective view of an indoor unit of an air conditioner to which a fan according to the present invention is applied.

2 is a side cross-sectional view of the indoor unit of the air conditioner to which the fan according to the present invention is applied.

3 is an enlarged view illustrating a portion 'A' of FIG. 2.

4 is a perspective view of a fan according to the present invention.

5 is a plan sectional view of a fan according to the present invention.

6 is a perspective view of a fan according to the prior art.

<Explanation of symbols on main parts of the drawings>

2: base 3: air intake guide

4: first inlet panel 6: third filter

7: fourth filter 8: fifth filter

9: filter frame 10: cabinet

20: front inner panel 20a, 20b: side part

20c: front part 20d: top part

21, 22: side air outlet 23: top air outlet

24: first discharge port panel 25: second discharge port panel

26: third discharge port panel 30: left suction panel

30a: air intake hole 31: second intake panel

32: second filter guide 33: first filter

36: suction panel 36a: air suction hole

37: third inlet panel 38: second filter guide

39: second filter 40: front panel

47: upper fixing bracket 50: heat exchanger

60: air purifier 70: blower

72: fan housing 74: fan

76: motor 80: hub

82: shroud 84: blade

The present invention relates to a fan mainly used in home appliances such as an air conditioner, and more particularly, to a fan in which the outer peripheral end of the blade is formed in a step shape so that the outer diameter of the blade is different in the axial direction of the fan.

In general, an air conditioner is a device using a heat exchange cycle consisting of a compressor, a condenser, an evaporator, and an expander. That is, the air conditioner condenses in the condenser after the refrigerant is compressed in the compressor, and then expanded in the expansion mechanism, and evaporated in the evaporator and then circulated back to the compressor, whereby the air around the condenser or evaporator is exchanged with the refrigerant. The temperature is raised or cooled to provide cold or warm air to the building or room in which the air conditioner is installed.

These air conditioners are largely divided into separate type and integral type.

The separation type and the integrated type are functionally the same, but the separation type has an indoor heat exchanger (evaporator or condenser) installed in the indoor unit, and an outdoor heat exchanger (condenser or evaporator) and a compressor installed in the outdoor unit. The one-piece unit is an indoor heat exchanger, a compressor, an outdoor heat exchanger, and an expansion device.

The integrated air conditioner includes a window type air conditioner installed directly by hanging a device on a window, and a duct type air conditioner connected to an intake duct and a discharge duct and installed outside the room. The separate type air conditioners include stand type air conditioners installed upright and wall-mounted air conditioners mounted on a wall.

In addition, the air conditioner may be classified into a cooling air conditioner that is used only for cooling, and a heat pump type air conditioner that may be used for both cooling and heating.

Recently, a multi-type air conditioner including at least one outdoor unit and a plurality of indoor units has been widely used.

On the other hand, the air conditioner as described above is provided with a fan so that the air that is heat-exchanged with the refrigerant of the condenser or evaporator can be smoothly blown.

Hereinafter, a fan according to the related art, which is widely used in home appliances such as an air conditioner as described above, will be described in detail with reference to FIG. 6.

Figure 6 is a perspective view of a fan according to the prior art, the fan according to the prior art by the driving force of the motor to the hub 100, the shroud 102 and the plurality of blades 104 to be integrally rotated, After the external air of the fan is forcedly introduced in the axial direction of the fan, the fan is forced to discharge through the space between the plurality of blades 104 in the centrifugal direction of the fan.

The outer diameter of the blade 104 is a diameter of a circle whose radius is a straight line from the center of the fan to the outer circumferential end of the blade 104 in the radial direction of the fan, typically the respective blade 104 Is provided so that the outer diameter of the blade 104 is constant in the axial direction of the fan. In other words, the outer circumferential end of each blade 104 is parallel to the axial direction of the fan.

However, the fan according to the prior art as described above, when the air is discharged from the fan and the air flow side of the pressure plane side of the blade 104 and the air flow side of the negative pressure side of the blade 104 merge, the pressure difference is large Vortex is generated and the outer diameter of the blade 104 is constant in the axial direction of the fan, so that the vortices generated at the outer circumferential end of the blade 104 are mixed with each other in the axial direction of the fan to generate a large aerodynamic noise. There is this.

The present invention has been made to solve the above problems of the prior art, the outer peripheral end of the blade is formed in a step shape so that the outer diameter of the blade in the axial direction of the fan, the vortex generated in the outer peripheral end of the blade It is an object of the present invention to provide a fan that can be generated at different positions along the axial direction of the fan to reduce aerodynamic noise.

The fan according to the present invention for solving the above problems is a hub connected to the motor of the fan; A shroud spaced apart from the hub in the axial direction of the fan; A plurality of blades provided between the shroud and the hub; The outer circumferential end of each blade is formed in a step shape such that the outer diameter of each blade is different in the axial direction of the fan, one side of each end is parallel in the axial direction of the fan and the other surface is in the radial direction of the fan. It is characterized in that parallel to.

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

1 is a perspective view of the indoor unit of the air conditioner to which the fan is applied according to the present invention, and FIG. 2 is a side cross-sectional view of the indoor unit of the air conditioner to which the fan is applied according to the present invention.

1 to 2, the indoor unit of the air conditioner to which the fan is applied according to the present invention as shown in FIGS. 1 to 2 includes a base 2, a cabinet 10 disposed above the base 2, and the cabinet 10. A front inner panel 20 disposed above the front side of the front panel, through which air is discharged, left and right suction panels 30 and 36 disposed below the front inner panel 20 and into which air is sucked, and the front inner side The front panel 40 and the front panel 40 disposed in front of the lower side of the panel 20 is configured to include.

The base 2 is provided with an air suction guide 3 for guiding the air sucked from the front of the base 2 to the upper side of the base 2, to open and close the air suction guide 3 The first inlet panel 4 for rotation is installed to be rotatable.

The cabinet 10 has a lower surface and a front surface open, a rear portion of the cabinet 10 is vertically disposed on the upper side of the base 2, the left and right side portions are formed to be inclined with the rear portion, and the upper surface portion is formed perpendicular to the rear portion.

The front inner panel 20 has a lower surface and a rear surface open, the left and right side portions 20a and 20b are formed to be inclined with the front portion 20c, and the upper surface portion 20d is perpendicular to the front portion 20c. Is formed.

The front inner panel 20 has side air outlets 21 and 22 through which air is discharged in each of the side parts 20a and 20b, and opens and closes each of the side air outlets 21 and 22. The first and second discharge port panels 24 and 25 are rotatably installed, and an upper air discharge port 23 through which air is discharged is formed in the upper surface part 20d, and the opening and closing of the upper air discharge port 23 is performed. The three discharge port panels 26 are rotatably provided.

The left suction panel 30 is disposed up and down between the bottom of the left surface portion 20a of the front inner panel 20 and the base 2, and the right suction panel 36 is disposed on the front inner panel 20. It is disposed up and down between the bottom of the right side surface portion (20b) and the base (2).

Each of the left and right suction panels 30 and 36 has air inlets 30a and 36a through which air is sucked, and second and third inlet panels for opening and closing the air inlets 30a and 36a. 31) 37 are provided so that rotation is possible.

The first filter 33 and the second filter 39 are mounted on the rear surfaces of the left and right suction panels 30 and 36 so that foreign substances in the air sucked through the air suction ports 30a and 36a are filtered.

The front panel 40 is rotatably connected to the base 2 and the front inner panel 20 in a forward direction.

The front panel 40 is pivotally connected to the lower end of one side of the left and right to the lower fixing bracket fixed to the base 2, the left and right middle to the upper fixing bracket 47 fixed to the front inner panel 20. The upper end of one side is rotatably connected.

The front side of the base 2 is opened so that the third, fourth and fifth filters 6 and 7 can be slidably attached and detached, and the front and rear sliding of the third, fourth and fifth filters 6 and 7 is performed. Filter guide ribs 9a, 9b, 9c are formed, and the filter frame 9 having the upper and lower surfaces thereof is mounted.

Here, the third, fourth, fifth filter (5) (6) (7) is made of any one of various filters such as pre-filter, hepa filter, nano carbon filter, nano copper filter, nano silver filter, Two or more are combined.

In addition, the indoor unit of the air conditioner is provided with a heat exchanger 50 for heating / cooling air by using a refrigerant. The heat exchanger 50 is mounted to the cabinet 10 and the front inner panel 20 to be inclined between the front inner panel 20 and the top of the cabinet 10.

In addition, the indoor unit of the air conditioner is provided with an air purifier 60 for purifying the air sucked into the indoor unit of the air conditioner.

In addition, the indoor unit of the air conditioner is disposed behind the air purifier 60 to suck the outside air into the indoor unit of the air conditioner so as to pass through the air purifier 60 and the heat exchanger 50 in turn, and then air The blower 70 which blows out of the indoor unit of a harmonic is provided.

3 is an enlarged view of portion 'A' of FIG. 2, FIG. 4 is a perspective view of a fan according to the present invention, and FIG. 5 is a plan sectional view of the fan according to the present invention.

The blower 70 includes a fan housing 72 having an air inlet 72a and an air outlet 72b, a fan 74 rotatably installed in the fan housing 72, and the fan 74. And a motor 76 connected to the rotary shaft 74a to rotate the fan 74, and an orifice 78 disposed at the front of the fan housing 72 and having an air suction hole 78a formed therein. It is configured by.

The air inlet 72a of the fan housing 72 is located at the front of the fan housing 72, and the air outlet 72b of the fan housing 72 is located at the circumferential surface of the fan housing 72. .

The fan 74 has a hub 80 coupled with the rotation shaft 76a of the motor 76 so as to be integrally rotated with the rotation shaft 74a of the motor 76, and the fan from the hub 80. It comprises a shroud 82 spaced at regular intervals in the axial direction of (74), and a plurality of blades 86 provided radially disposed between the shroud 82 and the hub (84).

The hub 80 is formed in a circular shape and has a hub boss 80a coupled to a rotation shaft 76a of the motor 76 at a central portion thereof.

The hub boss 80a may be provided to protrude toward the shroud 82 between the plurality of blades 84.

The hub boss 80a is formed at one or more stages on one side of the shroud 82 side of the hub boss 80a, and the stages of the hub boss 80a may be minimized so that the flow resistance of the air sucked into the fan 74 may be minimized. It is formed to be smooth. In this embodiment, one side of the shroud 82 side of the hub boss 80a is illustrated as having a three-stage structure bent twice.

A rib 81 for reinforcing strength of the hub 80 may be provided on the rear surface of the hub 80. The rib 81 may be integrally formed with the hub 80 to protrude vertically from the hub 80 toward the motor 76, and may be radial with respect to the rotation axis 76a of the motor 76. It may be provided with a plurality arranged.

The shroud 82 may be provided as a ring-shaped plate in which an air inlet 82a is formed at the center thereof so that air is sucked into the fan 74.

Each of the blades 84 is a plate disposed in the radial direction of the fan 74. The blades of the blade 84 have an inner circumferential end of the root of the blades 84. 84 is a peripheral end of the tip (Tip of Brade) that the air introduced between the discharged from the blade 84 and forms the outer diameter of the blade (84). Each of the blades 84 is a pressure surface 84a that pushes air in a surface located in the front of the fan 74 in a rotational direction of the fan 74, and a surface located in the rear of the fan 74 in a rotational direction of the fan 74. As a back surface of the said pressure surface 84a, it is the negative pressure surface 84b which becomes pressure lower than atmospheric pressure.

Each of these blades 84 is in the shape of a backward feather with the inner circumferential side of the blade 84 laid back in the rotational direction of the fan 74, and the outer circumferential side of the blade 84 is the baby fan 74. It may be formed to have a shape of the turning feather lying down in the forward direction with respect to the direction of rotation.

And the outer peripheral end of each blade 84 is formed in a step shape so that the outer diameter of each blade is different in the axial direction of the fan.

In this case, the outer circumferential end of the blade has a right angle structure in which one surface of each end is parallel in the axial direction of the fan and the other surface is parallel in the radial direction of the fan.

And each end of the stepped outer circumferential end of each blade, the radial length of the fan of each end of the outer circumferential end of the blade is A, the axial direction of the fan of each end of the outer circumferential end of the blade When the length B, A: B is provided to satisfy 1: 1.5 ~ 1: 2.5.

Such a blade may be provided such that the outer diameter of the blade gradually decreases toward the hub in the shroud. That is, the blade may be provided such that the outer diameter of the blade at the shroud side is the same as the outer diameter of the shroud, and the outer diameter of the blade at the hub side is smaller than the outer diameter of the blade at the shroud side, but larger than the outer diameter of the hub.

Looking at the operation of the present invention configured as described above are as follows.

When the air purifying operation command or the cooling / heating operation command is input to the indoor unit of the air conditioner, the motor 76 of the blower 70 is driven to rotate the fan 74.

The first inlet panel 4 or the second and third inlet panels 31 and 37 open the inlet guide 3 or the air inlets 30a and 36a, and the first and second outlets. The panel 24, 25 or the third outlet port 26 opens the side air outlets 21, 22 or the top air outlet 23.

Then, by the blowing force of the fan 74, the outside air of the indoor unit of the air conditioner is sucked into the indoor unit of the air conditioner through the air inlets 30a, 36a or the suction guide unit 3, , The sucked air is purged while passing through the first, second, and third filters (33) and (39) or the third, fourth, and fifth filters (5), (6) and (7), and then pumped forward of the blower (70). do.

The air pushed forward of the blower 70 passes through the air intake hole 78a of the orifice 78 and the air inlet 72a of the fan housing 72 to form a fan 74 in the fan housing 72. Flows into.

The air flowing into the fan 74 is sucked into the center of the fan 74 through the air inlet 82a of the shroud 82 of the fan 74, and sucked into the center of the fan 74. Air is discharged in the centrifugal direction of the fan 74 by the plurality of blades (84).

In this case, when the air sucked into the center of the fan 74 is introduced between the plurality of blades 84, the fan load may be minimized since the air is guided by the inner circumferential side of the blade 84 having the backward feather shape. .

In addition, since the air introduced between the plurality of blades 84 is guided by the outer circumferential side of the blade-shaped blade 84, the amount of air discharged from the fan 74 may be maximized.

In addition, since the air flow discharged from the fan 74 may be stabilized because the air flowing in between the plurality of blades 84 is discharged from the fan along the axial direction of the fan, the aerodynamic noise resulting from the fan 74 may be stabilized. This can be minimized.

In addition, as the outer circumferential end of each blade 84 is formed in a step shape, the outer circumferential end of the blade 84 has a concave-convex structure, so that the vortex formed on the outer circumferential end side of the blade 84 is the blade 84. The air flow discharged from the fan 74 while being broken by) may be more stable.

As described above, the air discharged from the fan 74 is discharged from the fan housing 72 to the heat exchanger 50 through the air outlet 72b of the fan housing 72.

The air discharged to the heat exchanger 50 is heat-exchanged with the refrigerant in the heat exchanger 50 while passing through the heat exchanger 50, and then the side air outlets 21 and 22 or the upper air outlet 23. It is discharged to the outside of the indoor unit of the air conditioner through.

In the fan according to the present invention configured as described above, the outer circumferential end of each blade is formed in a step shape so that the outer diameter of the blade is different in the axial direction of the fan, so that the flow of air discharged from the fan can be stabilized. There is an advantage that the aerodynamic noise can be reduced.

In addition, since the fan according to the present invention has a concave-convex structure by forming the outer circumferential end of the blade in a stepped shape, the vortex in the air flow discharged from the fan may be broken by the blade, so that the flow of air discharged from the fan There is an advantage that it is more stable, and thus the aerodynamic noise can be minimized.

In addition, the fan according to the present invention is formed by the inner circumferential side of each blade in the rear feather shape and the outer circumferential side of each blade is formed in the forward feather shape, the load of the fan is minimized as well as the size of the fan There is an advantage that the air volume of the fan can be maximized.

In addition, the fan according to the present invention supports the blade and the hub boss coupled to the rotating shaft of the motor to the hub connected to the motor is formed to protrude toward the inside of the fan, the one side of the shroud side of the hub boss is formed smoothly There is an advantage that the decrease in the flow of air by the hub boss can be minimized.

In addition, the fan according to the present invention is provided with a plurality of ribs arranged radially around the rotation axis of the motor on the rear of the hub, there is an advantage that the coupling force between the hub and the rotation shaft of the motor can be reinforced.

Claims (7)

A hub connected to the motor of the fan; A shroud spaced apart from the hub in the axial direction of the fan; A plurality of blades provided between the shroud and the hub; The outer circumferential end of each blade is formed in a step shape such that the outer diameter of each blade is different in the axial direction of the fan, one side of each end is parallel in the axial direction of the fan and the other surface is in the radial direction of the fan. The fan, characterized in that parallel to. The method according to claim 1, Each of the blades is characterized in that the outer diameter of the blade is provided to gradually decrease toward the hub in the shroud. The method according to claim 1, And an inner circumferential side of each blade is a rear feather type, and an outer circumferential side of each blade is a forward feather type. The method according to any one of claims 1 to 3, Each step of the stepped outer circumferential end of each of the blades, A: B is 1: 1.5 to 1 when the length in the radial direction of the fan is A, and the length in the axial direction of the fan is B. : A fan characterized in that it is provided to satisfy 2.5. The method according to any one of claims 1 to 3, And an outer diameter of the blade is larger than an outer diameter of the hub. The method according to claim 1, The hub is provided with a hub boss coupled with the rotating shaft of the motor, One side of the shroud side of the hub boss is formed in one or more stages, characterized in that the surface of each stage is smooth. The method according to claim 1 or 6, A fan, characterized in that the rib is provided on the back of the hub.

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