JP2008144753A - Turbofan and air conditioner provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbofan simultaneously reducing noise and power consumption, and an air conditioner provided with the turbofan and providing improved performance. <P>SOLUTION: This turbofan is configured so that a blade is formed into a backward blade inclined in a direction opposite to the rotating direction of a rotary plate, the positive pressure surface of the blade arranged in the rotating direction of the rotary plate is formed into a plane, and the negative pressure surface of the blade arranged in the direction opposite to the rotating direction of the rotary plate is formed into a projecting surface. The radius of curvature of a curved surface formed by the negative pressures surface is set from 2.5 to 4 times larger than the radius of the turbofan. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turbo fan and an air conditioner including the same, and more particularly to a turbo fan capable of reducing noise and power consumption and an air conditioner including the same.

  In general, a blower fan blows air by a rotational force, and is used for a refrigerator, an air conditioner, a vacuum cleaner, and the like. Such a blower fan is classified into an axial flow fan, a sirocco fan, a turbo fan, and the like according to a method of sucking and discharging air and its shape.

  In particular, a turbofan is a device that allows air to flow in between the fan blades in the radial direction after flowing air in the axial direction of the fan. Air naturally flows into the fan and then discharged to the outside. Therefore, it is not necessary to further provide a duct, and because of this advantage, it is widely used in various fields.

  A general turbofan has a rotating plate on which a fan motor is mounted, a plurality of blades arranged radially on the rotating plate, and a shroud forming a front surface of the turbofan. Prepare.

  A suction port through which air is sucked is formed at the center of the shroud, and a discharge port for discharging the sucked air is formed in the circumferential direction between the rotating plate and the shroud.

  When the rotating plate is rotated by driving the fan motor, the blade formed integrally with the rotating plate is rotated at the same time, external air is sucked in the axial direction through the suction port, and the sucked air is radially discharged from the discharge port. Discharged.

  On the other hand, each blade has an airfoil shape and is attached radially between the rotating plate and the shroud around the axis of the fan motor.

  The blade can be mounted at various angles between the rotating plate and the shroud, and is classified into a forward-facing type and a rear-facing type according to the mounting angle of the blade.

  A turbofan that uses a rear-facing type blade that is inclined in the direction opposite to the direction of rotation of the rotating plate is good in efficiency (in terms of power consumption), but the number of rotations of the fan must increase and noise is relatively low. It gets bigger. On the other hand, a turbofan that uses a forward-type blade in which the blade is inclined in the rotational direction of the rotating plate has a problem of low noise but low efficiency (in terms of power consumption) due to the characteristics of the forward-type.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a turbo fan capable of reducing noise while increasing fan efficiency, and an air conditioner including the same.

  In order to achieve the above object, a turbofan according to the present invention is installed so as to face a rotating plate coupled to driving means, blades radially arranged on the rotating plate, and one surface of the rotating plate. A ring-shaped shroud, wherein a positive pressure surface of the blade provided in the rotation direction of the rotating plate is planar, and the blade is provided in a direction opposite to the rotation direction of the rotating plate. The negative pressure surface was configured to be convex.

  In addition, the curvature radius of the curved surface formed by the suction surface may be 2.5 to 4 times the turbofan radius.

  The blade may have a form of a backward-facing blade inclined in the direction opposite to the rotation direction of the rotating plate.

  In order to achieve the above object, an air conditioner according to the present invention includes a main body having a suction port through which air is sucked and a discharge port through which air is discharged, and the suction port provided inside the main body. A heat exchanger for exchanging heat from the air sucked from, a rotating plate connected to the driving means, blades arranged radially on the rotating plate, and a ring installed to face one surface of the rotating plate An air conditioner including a shroud having a shape, and a turbo fan that sucks air from the suction port and blows air to the heat exchanger side, the pressure surface of the blade provided in the rotation direction of the rotating plate Is made flat, and the suction surface of the blade provided in the direction opposite to the rotation direction of the rotating plate is made convex.

  The curvature radius of the curved surface formed by the suction surface may be 2.5 to 4 times the turbofan radius.

  The blade may have a shape of a backward-facing blade inclined in the opposite direction in which the rotating plate rotates.

  The turbofan according to the present invention for achieving the above object includes a rotating plate connected to the driving member, one side connected to the rotating plate, and tilted in a direction opposite to the rotating direction of the rotating plate, And a ring-shaped shroud connected to the opposite side of each of the plurality of blades on the side connected to the rotating plate.

  The pressure surface of each blade may be planar, and the suction surface of each blade may be curved.

  In order to achieve the above object, an air conditioner according to the present invention includes a main body having a suction port for sucking air and a discharge port for discharging air, and is provided inside the main body. An air conditioner comprising: a heat exchanger for exchanging heat from the air sucked from; and a turbofan for sucking air from the suction port and discharging the sucked air to the heat exchanger side, A turbofan is a rotating plate connected to a driving member, and a plurality of blades, one side of which is connected to the rotating plate, tilted in a direction opposite to the rotation direction of the rotating plate, and each one surface is formed into a curved surface. And a ring-shaped shroud connected to the opposite side of each of the plurality of blades on the side connected to the rotating plate.

  According to the turbofan according to the embodiment of the present invention, noise and power consumption can be simultaneously reduced, and the performance of the turbofan can be improved.

  In addition, when the turbo fan is mounted on an air conditioner, the noise and power consumption of the air conditioner are reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a turbo fan and an air conditioner including the turbo fan according to the invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a turbofan 1 according to an embodiment of the present invention includes a rotating plate 10 that rotates with a driving unit connected to the center, and a plurality of the rotating plate 10 that are radially arranged on the rotating plate 10 and integrally formed. A blade 20 and a ring-shaped shroud 30 coupled to the end of the blade 20 so as to face one surface of the rotating plate 10.

  The rotating plate 10 accommodates a fan motor (not shown) generally connected as a driving means at the center, and flows the air flow into the inner peripheral edge 31 of the shroud 30 and discharged from between the blades 20. A hub 11 to be guided, a boss portion 12 provided at the center of the hub 11 and having a shaft hole coupled to a shaft of a fan motor or the like of the driving means, and a function of being drilled on the surface of the hub 11 and cooling the driving means. And a through-hole portion 13 for carrying. The through-hole portion 13 plays a role of cooling the hot air of the fan motor by allowing cold air to flow into the fan motor of the driving means.

  On the other hand, the ring-shaped shroud 30 coupled to the other end of the blade 20 formed integrally with the rotary plate 10 is arranged so that air flows into the turbofan 1 in the axial direction and is discharged in the radial direction. It has a peripheral edge 31 and an outer peripheral edge 32.

  A suction port 30a through which air is sucked is formed at the center of the shroud 30, and a discharge port 30b through which the sucked air is discharged is formed in the circumferential direction between the rotating plate 10 and the shroud 30. .

  The shroud 30 is generally bonded to the other end of the blade 20 injection-molded integrally with the rotating plate 10 by heat fusion and / or ultrasonic fusion. It may be injection molded.

  As shown in FIG. 1, the shroud 30 has an inner peripheral edge 31 that protrudes outward by a certain length. This is because the air sucked into the fan passes through the inner peripheral edge 31 of the shroud 30 on the blade 20 side. This is so that it can be effectively guided.

  FIG. 2 is a front view of the turbofan 1 shown in FIG.

  As shown in FIG. 2, in the turbofan 1 according to the embodiment of the present invention, a plurality of blades 20 are arranged between the outer peripheral edge of the hub 11 and the outer peripheral edge 32 of the shroud 30. The blades 20 are formed radially around the boss portion 12 formed on the hub 11.

  Strictly speaking, the blade 20 does not extend in the radial direction about the boss portion 12 but tilts in the direction opposite to the rotation direction of the rotating plate 10, and thus becomes a type of a backward blade.

  Each blade 20 has at least one curved surface for improving the efficiency of the turbofan 1. However, the turbofan 1 of the present invention has a positive pressure surface 20 a that is a blade surface on the rotational direction side of the rotating plate 10 in a planar shape. The negative pressure surface 20b, which is the blade surface on the opposite side of the rotation direction of the rotating plate 10, is curved.

  3A and 3B show a turbo fan 1 according to the present invention and two turbo fans according to comparative examples for comparing noise and power consumption, with the turbo fan 1 in which the pressure surface 20a of the blade 20 is made flat as in the present invention. ing.

  FIG. 3A shows a turbo fan (hereinafter referred to as “A type”) in which the pressure surface 20a of the blade is convex, and FIG. 3B shows that the pressure surface 20a of the blade is concave. The type of turbo fan (hereinafter referred to as “B type”) is shown.

  In the present invention, an experiment was performed to compare the performance of the turbofan 1 in which the positive pressure surface 20a of the blade 20 is flat with the performance of the A type turbofan and the B type turbofan.

  FIG. 4A is a graph showing the relationship between the air volume and noise in each turbo fan obtained from the experiment, and FIG. 4B is a graph showing the relationship between the air volume and power consumption in each turbo fan obtained from the experiment.

  As is clear from FIG. 4A, it can be seen that the noise of the turbofan 1 according to the embodiment of FIGS. 1 and 2 is less than that of the A and B type turbofans under the same airflow conditions.

  4B, the turbo fan 1 according to the embodiment of FIG. 1 and FIG. 2 is slightly larger in power consumption than the A type turbo fan under the condition of the same air volume, but the B type turbo fan. You can see that it is much smaller than.

  Comparing the above three types of turbo fans with reference to FIG. 4A and FIG. 4B, the performance of the B type turbo fan is slightly better in terms of power consumption than the turbo fan 1 of FIG. 1 and FIG. However, it can be seen that the noise is significantly inferior to the turbo fan 1, and the performance of the A-type turbo fan is inferior in both noise and power consumption compared to the turbo fan 1 of FIGS. You can see that

  From the above experimental results, it can be seen that the turbofan 1 of FIGS. 1 and 2 in which the positive pressure surface 20a of the blade 20 is planar is most excellent in terms of performance.

  On the other hand, under the assumption that the pressure surface 20a of the blade 20 is flat, the performance of the turbofan with the form of the suction surface 20b was tested. In this case, the positive pressure surface 20a was flat, while the negative pressure surface 20b was flat or convex.

  FIG. 5 is an enlarged view of the blade 20 of the turbofan 1 shown in FIG.

  As shown in FIG. 5, the radius of the turbo fan 1 is represented by “d”, and the curvature radius of the curved surface formed by the suction surface 20 b of the blade 20 is represented by “r”. Here, when the ratio of the radius of curvature ‘r’ of the suction surface 20b to the radius ‘d’ of the turbo fan 1 is represented by ‘R’, the equation R = r / d is established.

  FIG. 6A is a graph showing the relationship between the air volume and noise depending on the value of R obtained from the experiment, and FIG. 6B is a graph showing the relationship between the air volume and power consumption depending on the value of R obtained from the experiment. .

  As shown in FIG. 6A, when the value of R is 0 (hereinafter, “R = 0” means that the suction surface becomes a flat surface) under the condition of the same air volume, the noise is the largest, and the value of R It can be seen that the noise is the lowest when is 4 and 6. Further, as shown in FIG. 6B, it can be seen that the power consumption is the largest when the R value is 6 and the power consumption is small when the R values are 0, 2, and 4 under the condition of the same air volume.

  From the results shown in FIGS. 6A and 6B, it can be seen that it is preferable to set the R value to 2.5 to 4 in order to reduce the noise and the power consumption at the same time. Therefore, according to the embodiment of FIGS. The turbo fan 1 is designed so that the ratio R of the radius of curvature r of the suction surface 20b to the radius d of the turbo fan 1 is 2.5-4.

  As described above, in the turbofan 1 according to the embodiment of FIGS. 1 and 2, the pressure surface 30 a of the blade 30 is planar, and the radius of curvature r of the suction surface 30 b of the blade 30 is the radius d of the turbofan 1. By setting it to 2.5 to 4 times, noise and power consumption can be reduced at the same time.

  FIG. 7 is a cross-sectional view showing an air conditioner according to an embodiment of the present invention provided with the turbofan 1 configured as described above.

  As shown in FIG. 7, the ceiling-mounted air conditioner is installed inside the ceiling 41 through the opening 42 of the ceiling 41, and the box-shaped main body 50 whose lower surface is opened, the lower surface of the main body 50, and the ceiling And a lower panel 60 attached to the lower end of the main body 50 so as to cover the opening 42 of 41.

  A blower 52 that generates a blowing force in room air is installed in the center of the main body 50. Heat exchange is performed around the blower 52 so that air discharged from the blower 52 passes and exchanges heat. A vessel 53 is installed. A suction port 61 is formed at the center of the lower panel 60, and a discharge port 62 is formed on the outer periphery of the suction port 61.

  The blower 52 is similar to the embodiment of FIGS. 1 and 2, the turbo fan 1 that sucks air in the axial direction from the center and discharges it in the radial direction, and the inner front surface of the main body 50 so as to drive the turbo fan 1. And a fan motor 2 fixed to the motor. The heat exchanger 53 is installed around the turbo fan 1 so that heat is exchanged while air blown by the operation of the turbo fan 1 passes. A support member 54 that supports the heat exchanger 53 and collects and discharges the condensed water flowing from the heat exchanger 53 is installed at the inner lower portion of the main body 50.

  In the ceiling-mounted air conditioner configured as described above, when the air blower 52 inside the main body 50 operates, the air sucked into the main body 50 from the suction port 61 is heat-exchanged while passing through the heat exchanger 53. After that, by supplying the air again from the discharge port 62 to the indoor space, the indoor space can be cooled or heated.

  As described above, the ceiling-mounted air conditioner can reduce noise and power consumption by installing the turbo fan 1 shown in FIGS. 1 and 2. Here, the case where the turbo fan 1 of FIG. 1 and FIG. 2 is installed in the ceiling-mounted air conditioner has been described, but the present invention is not limited to this, and the turbo fan 1 is applicable to various air conditioners and various electronic products. Can also be used.

It is a perspective view which shows the turbo fan by one embodiment of this invention. It is a front view of the turbo fan shown in FIG. It is a front view which shows the comparative example of the turbofan by one embodiment of this invention, respectively. It is a front view which shows the comparative example of the turbofan by one embodiment of this invention, respectively. It is a graph which shows the relationship between the air volume and noise in the turbo fan shown in FIG. 2 and the turbo fan shown in FIG. 3A and FIG. 3B. It is a graph which shows the relationship between the air volume in the turbo fan shown in FIG. 2, and the turbo fan shown to FIG. 3A and 3B, and power consumption. FIG. 3 is an enlarged view showing a blade of the turbo fan shown in FIG. 2. It is a graph which shows the relationship between the air volume and the noise by the change of the curvature radius of the blade suction surface shown in FIG. It is a graph which shows the relationship between the air volume by the change of the curvature radius of the blade suction surface shown in FIG. 5, and power consumption, respectively. It is sectional drawing which shows the air conditioner with which the turbo fan by one embodiment of this invention was mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating plate 20 Blade 20a Positive pressure surface 20b Negative pressure surface 30 Shroud 30a Suction port 30b Discharge port

Claims (9)

A rotating plate coupled to the driving means;
Blades arranged radially on the rotating plate;
A turbofan comprising: a ring-shaped shroud installed to face one surface of the rotating plate;
The pressure surface of the blade provided in the rotation direction of the rotating plate is planar, and the suction surface of the blade provided in the direction opposite to the rotation direction of the rotating plate is convex. fan.   The turbofan according to claim 1, wherein a radius of curvature of the curved surface formed by the suction surface is 2.5 to 4 times the radius of the turbofan.   2. The turbofan according to claim 1, wherein the blade has a shape of a backward-facing blade inclined in a direction opposite to a rotation direction of the rotating plate. A main body having a suction port for sucking air and a discharge port for discharging air;
A heat exchanger provided inside the main body for exchanging heat from the air sucked from the inlet;
A rotating plate connected to the driving means; a blade radially arranged on the rotating plate; and a ring-shaped shroud installed to face one surface of the rotating plate, and sucks air from the inlet. A turbo fan for blowing air to the heat exchanger side,
In an air conditioner comprising:
The pressure surface of the blade provided in the rotation direction of the rotating plate is planar, and the suction surface of the blade provided in the opposite direction to the rotation direction of the rotating plate is convex. Harmony machine.   The air conditioner according to claim 4, wherein a radius of curvature of the curved surface formed by the suction surface is 2.5 to 4 times the radius of the turbofan.   The air conditioner according to claim 4, wherein the blade has a shape of a backward-facing blade inclined in an opposite direction in which the rotating plate rotates. A rotating plate coupled to the drive member;
A plurality of blades, one side of which is connected to the rotating plate, inclined in a direction opposite to the rotating direction of the rotating plate, and each one surface is formed into a curved surface;
A ring-shaped shroud connected to the opposite side of each of the plurality of blades on the side connected to the rotating plate;
Turbo fan with   The turbo fan according to claim 7, wherein the pressure surface of each blade is planar, and the suction surface of each blade is curved. A main body having a suction port for sucking air and a discharge port for discharging air;
A heat exchanger provided inside the main body for exchanging heat from the air sucked from the inlet;
A turbo fan that sucks air from the suction port and discharges the sucked air to the heat exchanger side,
The turbofan is
A rotating plate coupled to the drive member;
A plurality of blades, one side of which is connected to the rotating plate, inclined in a direction opposite to the rotating direction of the rotating plate, and each one surface is formed into a curved surface;
A ring-shaped shroud connected to the opposite side of each of the plurality of blades on the side connected to the rotating plate;
An air conditioner comprising:

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