CN112752908A

CN112752908A - Air circulator with double rotary wings

Info

Publication number: CN112752908A
Application number: CN202080005291.7A
Authority: CN
Inventors: 徐东禛; 吴龙柱; 金民锡
Original assignee: Miro Co Ltd
Current assignee: Miro Co Ltd
Priority date: 2019-01-31
Filing date: 2020-01-21
Publication date: 2021-05-04
Also published as: KR20200096105A

Abstract

An air circulator having a dual rotary wing according to an embodiment of the present invention is characterized by comprising: a housing assembly formed with a suction port for sucking air and a discharge port for discharging air; an air suction fan assembly including an air suction motor fixedly coupled to an inside of the housing assembly and an air suction fan rotationally driven by the air suction motor; and an exhaust fan assembly including an exhaust motor fixedly coupled to an inside of the housing assembly and an exhaust fan rotatably driven by the exhaust motor, wherein the number of revolutions of the exhaust fan is greater than the number of revolutions of the intake fan.

Description

Air circulator with double rotary wings

Technical Field

The present invention relates to an air circulator, and more particularly, to an air circulator having dual rotary wings, which is configured by dual wings including an intake fan having a large rotary wing diameter and an exhaust fan having a small rotary wing diameter, thereby improving a linear movement capability of wind and a blowing efficiency.

Background

An Axial Flow Fan (Axial Flow Fan) is a fluid machine including a plurality of rotary blades radially arranged around a hub, and is rotated by a motor or the like to blow air in an Axial direction of the rotary blades. A heat radiation Fan (Cooling Fan) is a typical axial flow Fan, and blows air for heat radiation to a heat exchanger in order to promote heat radiation of an air-cooled heat exchanger such as a general electric Fan, an indoor ventilation Fan, a radiator of an automobile, or a capacitor.

In particular, an axial flow fan of a heat exchanger installed in an air conditioner of an automobile is installed at a rear surface or a front surface of the heat exchanger together with a cover plate (Shroud) having guide wings (Stator) for guiding blowing air in an axial direction from a front surface or a rear surface of the vent hole by surrounding the axial flow fan with a bell mouth type vent hole, and the axial flow fan for an air cooling type heat exchanger of an automobile is classified into a push type (Pusher type) and a pull type (Puller type) according to an arrangement form of the heat exchanger.

However, the conventional general axial flow fan has a single-blade structure, and has a problem of low air blowing efficiency due to structural limitations of a single-blade rotary blade.

Disclosure of Invention

Technical problem

The present invention is directed to an air circulator having dual rotary wings to solve the problems of the conventional single wing axial flow fan as described above and to improve a linear moving capability of wind and a blowing efficiency.

Technical scheme

The air circulator with double rotating wings of the embodiment of the invention is characterized by comprising: a housing assembly formed with a suction port for sucking air and a discharge port for discharging air; an air suction fan assembly including an air suction motor fixedly coupled to an inside of the housing assembly and an air suction fan rotationally driven by the air suction motor; and an exhaust fan assembly including an exhaust motor fixedly coupled to an inside of the housing assembly and an exhaust fan rotationally driven by the exhaust motor and having a rotation radius smaller than that of the suction fan, wherein the rotation number of the exhaust fan is greater than that of the suction fan.

In the present invention, when the rotation number of the intake fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 1.5 to 1: 1.7.

alternatively, the present invention is characterized in that when the rotation number of the intake fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 1.7 to 1: 2.

alternatively, the present invention is characterized in that when the rotation number of the intake fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 2.

alternatively, the present invention is characterized in that the number of rotations of the suction fan is 70% to 30% greater than the number of rotations of the exhaust fan.

Alternatively, the present invention is characterized in that the number of rotations of the suction fan is 60% to 40% greater than the number of rotations of the exhaust fan.

Alternatively, the present invention is characterized in that, when the blowing distance of the air discharged from the casing assembly is made to be the same by changing the number of rotations of the intake fan and the number of rotations of the exhaust fan, a set having a lower number of rotations ratio between the intake fan and the exhaust fan is selected to reduce the power consumption of the intake motor and the exhaust motor.

Alternatively, the present invention is characterized in that the housing assembly has a plurality of air intake holes formed along an outer peripheral edge thereof so as to be adjacent to the air intake port, and the air intake holes are used for taking in outside air.

Alternatively, the present invention is characterized in that the housing assembly includes: an air suction fan housing for accommodating the air suction fan assembly; an exhaust fan housing for accommodating the exhaust fan assembly; and a support body fixedly coupled to the suction fan housing between the suction fan housing and the exhaust fan housing, for fixedly supporting the suction fan assembly and the exhaust fan assembly, wherein a plurality of suction holes are formed at one side surface and an outer circumferential edge of the suction fan housing, and the suction holes are used for sucking external air.

Advantageous effects

The air circulator of the invention can blow air by using the double rotating wings, thereby improving the air supply efficiency, having good linear movement capability of wind and reducing the power consumption.

Drawings

Fig. 1 is a perspective view of an air circulator having dual rotary wings in accordance with an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the air circulator of fig. 1.

Fig. 3a, 3b and 3c are schematic diagrams of experiments on the straight-line movement capability of the wind of the air circulator in fig. 1.

Fig. 4 and 5 are diagrams of experiments performed by changing the number of revolutions of the exhaust fan.

Fig. 6a, 6b, and 6c are schematic diagrams of experiments on the straight-line movement capability of wind according to structural changes of the housing assembly.

Fig. 7 is a schematic diagram of an experiment on the generation of eddy current based on the structure of the housing assembly.

Description of the reference numerals

100: the air circulator 110: shell assembly

111: suction fan case 111 a: air suction hole

112: exhaust fan case 112 a: air vent

113: support body 120: air suction fan assembly

121: air intake fan 122: air suction fan hub

123: the suction vane 130: exhaust fan assembly

131: exhaust fan 132: exhaust fan hub

133: exhaust blade

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the invention. Those of ordinary skill in the art to which the invention pertains will be able to implement the invention in a variety of different embodiments, and the invention is not limited to the embodiments described herein. In order to clearly explain the present invention, portions irrelevant to the description are omitted in the drawings, and the same or similar structural elements are attached with the same reference numerals throughout the specification.

It should be understood that the terms "including" or "having" and the like in this specification are merely intended to indicate the presence of the features, numbers, steps, actions, structural elements, components, or combinations thereof described in the specification, and do not preclude the possibility of the presence or addition of at least one other feature, number, step, action, structural element, component, or combinations thereof, and when a portion of a layer, film, region, sheet, or the like is "on" another portion, this includes not only the case where another portion is "directly above" the other portion but also the case where the other portion is present therebetween. Conversely, when a part of a layer, a film, a region, a plate, or the like is "under" another part, the layer, the film, the region, the plate, or the like includes not only a case where the layer, the film, the region, the plate, or the like is "under" the other part, but also a case where the other part is present in the middle thereof.

As shown in fig. 1 and 2, an air circulator 100 having a dual rotary wing according to an embodiment of the present invention may include a housing assembly 110, an intake fan assembly 120, and an exhaust fan assembly 130.

The case assembly 110 is composed of two cases in a cylindrical shape as a whole, and may include a suction fan case 111 for enclosing the suction fan assembly 120 and an exhaust fan case 112 for enclosing the exhaust fan assembly 130.

The suction fan housing 111 has a cylindrical shape with a diameter larger than that of the discharge fan housing 112 and is opened at one side thereof to surround the suction fan assembly 120 with a large diameter, and a plurality of radial suction ports are formed at a rear side thereof through which air is sucked. The suction fan housing 111 is formed with a plurality of suction holes 111a extending in the longitudinal direction of the suction fan housing 111 along the outer peripheral edge. The suction holes 111a are advantageously formed in the outer periphery of the suction fan case 111 to be more dense, and are advantageously formed to have a longer length for facilitating suction.

The suction fan housing 111 includes a support body 113 for supporting the suction fan assembly 120 and the discharge fan assembly 130, and the support body 113 may be fixedly installed inside the suction fan housing 111 in a cross-shaped form of two rectangular support plates. Preferably, the support 113 is located at a position away from the suction port, and may be located at the center, when the case assembly 110 is actually assembled. The support body 113 may be provided to the suction fan housing 111 in a manner of fixing the motors supporting the suction fan assembly 120 and the exhaust fan assembly 130, so that it has high rigidity. The suction fan case 111 and the support body 113 may be separately manufactured and coupled to each other, and the suction fan case 111 and the support body 113 may be integrally injection-molded with the same material.

The exhaust fan housing 112 has a cylindrical shape having a diameter smaller than that of one side surface of the intake fan housing 111 and is opened to surround the exhaust fan assembly 130 having a small diameter, and a plurality of radial discharge ports are formed on the front surface side from which air is discharged. The exhaust fan case 112 is formed with a plurality of exhaust holes 112a extending in the longitudinal direction of the exhaust fan case 112 along the outer peripheral edge. It is more advantageous that the exhaust holes 112a are formed more densely at the outer circumference of the exhaust fan housing 112, and for convenience of exhaust, the length thereof is also more advantageous. However, the discharge hole 112a formed at the discharge fan housing 112 is optional, and although a plurality of discharge holes 112a are formed at the discharge fan housing 112 in this embodiment, the discharge fan housing 112 not formed with the discharge holes 112a may be used as needed.

The exhaust fan housing 112 may be combined with the suction fan housing 111 to be fixedly combined with a separate connection member, such as a bolt or a clip, which is commonly known to those skilled in the art, and thus a detailed description thereof will be omitted.

The suction fan assembly 120 is used to suck external air through the suction port and the suction hole 111a, and may include a suction motor (not shown) fixedly coupled to the support body 113 and a suction fan 121 coupled to the suction motor. The suction motor rotates the suction fan 121 by a driving power transmitted from the outside, and in this case, the suction motor may rotate in a direction opposite to that of the exhaust motor. That is, the suction fan 121 rotates in the opposite direction to the exhaust fan 131. And, a rotation radius of the suction fan 121 may be greater than that of the exhaust fan 131.

The suction fan 121 includes a suction fan hub 122 fixedly coupled to a rotary shaft (not shown) of the suction motor, and a plurality of suction blades 123 radially extending from the suction fan hub 122. Preferably, the suction vane 123 is fabricated in a manner larger than the discharge vane 133, and more particularly, the radius of rotation of the suction vane 123 is larger than that of the discharge vane 133.

The exhaust fan assembly 130 is used to discharge the air sucked into the housing assembly 110 to the outside through the suction blades 123, and may include an exhaust motor (not shown) fixedly coupled to the support 113 and an exhaust fan 131 coupled to the exhaust motor. The exhaust motor rotates the exhaust fan 131 by a driving power transmitted from the outside, and in this case, the exhaust motor may rotate in a direction opposite to that of the suction motor. That is, the exhaust fan 131 rotates in the opposite direction to the suction fan 121. And, a rotation radius of the exhaust fan 131 may be smaller than that of the suction fan 121.

The exhaust fan 131 includes an exhaust fan hub 132 fixedly coupled to a rotary shaft (not shown) of the exhaust motor, and a plurality of exhaust blades 133 radially extending from the exhaust fan hub 132. Preferably, the discharge vane 133 is fabricated in a smaller manner than the suction vane 123, and more particularly, the rotation radius of the discharge vane 133 is smaller than that of the suction vane 123.

Fig. 3a, 3b and 3c are graphs for testing the wind straight-line movement ability of the air circulator 100 according to the embodiment of the present invention, and the wind straight-line movement ability is tested by driving, not driving and freely rotating the exhaust fan 131 while changing the number of rotations of the suction fan 121.

In fig. 3a, the straight traveling capability of wind is evaluated by setting the number of revolutions of the suction fan 121 to 750RPM and the number of revolutions of the exhaust fan 131 to 1500 RPM. The air suction fan 121 and the air discharge fan 131 are rotated in opposite directions to each other, so that the linear movement capability of the detected wind is very good. That is, when the suction fan 121 and the exhaust fan 131 are all driven, laminar flow (laminar flow) is formed so that the wind has a linear movement capability, and thus, the wind blowing distance of the wind can be increased.

In fig. 3b, the number of revolutions of the suction fan 121 is set to 750RPM, and the wind is evaluated by not driving the exhaust fan 131, i.e., in a state where the exhaust fan 131 is fixed. In a state where the exhaust fan 131 is stopped, the exhaust fan 131 diffuses the wind as a resistance component, that is, generates a turbulent flow. In this way, the resistance of the exhaust fan 131 causes a phenomenon in which the straight-line movement capability of the wind is significantly reduced.

In fig. 3c, the rotation number of intake fan 121 is set to 400RPM, and the wind is evaluated in a state where exhaust fan 131 is freely rotated. In a state where the exhaust fan 131 is freely rotated, the laminar flow is maintained at a predetermined distance, and when the laminar flow is not less than the predetermined distance, a phenomenon in which the laminar flow is converted into a turbulent flow occurs. However, the result of generating the linear movement capability is presented as compared with fig. 3b, but the result of significantly decreasing the linear movement capability and the air blowing distance is presented as compared with fig. 3 a.

It was confirmed through the above experiments that, in the case where the suction fan 121 and the exhaust fan 131 are all operated, the air blowing distance of the air is increased by maintaining the laminar flow by the interaction between the air generated by the suction fan 121 and the exhaust fan 131.

As shown in fig. 4, an experiment for calculating the optimal number of Revolutions (RPM) of the suction fan 121 and the exhaust fan 131 was performed using the air circulator 100 having the dual rotary wing of the present invention having the above-described structure.

As basic conditions, the rotational speed of the intake fan was set to 750RPM and the rotational speed of the exhaust fan was set to 1500RPM, and then the rotational speeds of the respective fans were increased and decreased to simulate the linear movement capability of the wind.

(experiment 1)

An air suction fan: 600RPM to 900RPM, exhaust fan: 1500RPM

The linear movement capability of the wind was observed by increasing or decreasing the number of rotations of the air intake fan while keeping the number of rotations of the air exhaust fan constant, and as a result, a good linear movement capability was exhibited when the number of rotations of the air intake fan was 750RPM or more.

[ Table 1]

Revolution of suction fan (RPM)	Exhaust fan Revolution (RPM)	Linear movement capability of wind
			600	1500	Failure of the product
750	1500	Good effect
			900	1500	Good effect

The case where the number of revolutions of the suction fan is 750RPM and the case where the number of revolutions of the suction fan is 900RPM, both of good rectilinear movement ability and similar wind blowing distance are exhibited. In this case, the highest efficiency is exhibited when the power consumption for driving the suction fan is low power consumption of 750 RPM.

As shown in fig. 5, an experiment for calculating the optimal number of Revolutions (RPM) of the suction fan 121 and the exhaust fan 131 was performed using the air circulator 100 having the dual rotary wing of the present invention having the above-described structure.

(experiment 2)

An air suction fan: 700RPM to 1300RPM, exhaust fan: 2000RPM

[ Table 2]

Revolution of suction fan (RPM)	Exhaust fan Revolution (RPM)	Linear movement capability of wind
			700	2000	Failure of the product
1000	2000	Good effect
			1300	2000	Good effect

The straight-line moving ability of the wind was observed by increasing and decreasing the number of rotations of the air suction fan to 2000RPM, and as a result, when the number of rotations of the air suction fan was 1000RPM or more, a good straight-line moving ability was exhibited. The case where the number of revolutions of the suction fan is 1000RPM and the case where the number of revolutions of the suction fan is 1300RPM exhibit good rectilinear movement ability and a similar wind blowing distance. In this case, the highest efficiency is exhibited when the power consumption for driving the suction fan is low power consumption of 1000 RPM.

As observed through the above experiments, when the number of revolutions of the exhaust fan is 2 times that of the suction fan, good straight-line moving ability of wind and power efficiency are exhibited.

When the ratio of the number of Revolutions (RPM) of the exhaust fan to the suction fan is 1: preferably, when the number of rotations of the intake fan is R1 and the number of rotations of the exhaust fan is R2, 2 is R1: r2 may be 1: 1.5 to 1: 1.7, more preferably may be 1: 1.7 to 1: 2, most preferably may be 1: 2.

on the other hand, referring to fig. 6a, 6b and 6c, the air circulator 100 according to the present invention has a structure in which an air suction hole or an air discharge hole is formed on an outer circumferential surface of the case assembly 110, and thus, it is possible to minimize a vortex generated inside the case assembly 110. In fig. 6a, 6b, and 6c, the straight-line movement capability of wind and the generation of vortex due to the structure of the housing assembly 110 were tested.

Fig. 6a shows the evaluation result of the straight-line movement capability of the wind for the solid case in which the intake holes and the exhaust holes are not formed on the outer circumferential surface of case assembly 110, fig. 6b shows the evaluation result of the straight-line movement capability of the wind for case assembly 110 in which the intake holes are formed on the outer circumferential surface of intake fan case 111, and fig. 6c shows the evaluation result of the straight-line movement capability of the wind for case assembly 110 in which the intake holes are formed on the outer circumferential surface of intake fan case 111 and the exhaust holes are formed on the outer circumferential surface of exhaust fan case 112.

The experiment in which all of the three case assemblies were performed under the same conditions, that is, all of the suction fan and the exhaust fan were driven, the suction fan was set to 750RPM, the exhaust fan was set to 1500RMP, and the suction fan and the exhaust fan were rotated in opposite directions to each other.

According to the evaluation result of the solid case of fig. 6a, although the straight-line movement capability of the outlet air is exhibited, the air blowing distance is short, whereas the case assemblies of fig. 6b and 6c exhibit good straight-line movement capability and air blowing distance.

As shown in fig. 7, it was confirmed that the solid case generates a vortex flow inside the case due to the flow interference phenomenon and changes a portion of the laminar flow due to the action thereof, thereby reducing the blowing distance, and on the contrary, the suction hole is formed in the suction fan case, or the vortex flow due to the flow interference phenomenon is removed in the case assembly in which the suction hole and the discharge hole are formed in both the suction fan case and the discharge fan case, thereby having a good straight moving capability of the wind and the blowing distance.

The embodiments of the present invention have been described above, the gist of the present invention is not limited to the embodiments proposed in the present specification, and a person of ordinary skill in the art understanding the gist of the present invention can easily propose other embodiments by adding, changing, deleting, adding structural elements, and the like within the scope of the equivalent gist, but the present invention still falls within the scope of the present invention.

Claims

1. An air circulator having dual rotary vanes comprising:

a housing assembly formed with a suction port for sucking air and a discharge port for discharging air;

an air suction fan assembly including an air suction motor fixedly coupled to an inside of the housing assembly and an air suction fan rotationally driven by the air suction motor; and

an exhaust fan assembly including an exhaust motor fixedly coupled to an inside of the housing assembly and an exhaust fan rotationally driven by the exhaust motor and having a rotation radius smaller than that of the suction fan,

the rotation number of the exhaust fan is larger than that of the air suction fan.

2. The air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

when the rotation number of the suction fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 1.5 to 1: 1.7.

3. the air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

when the rotation number of the suction fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 1.7 to 1: 2.

4. the air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

when the rotation number of the suction fan is R1 and the rotation number of the exhaust fan is R2, R1: r2 is 1: 2.

5. the air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

when the air blowing distance of the air discharged from the housing assembly is the same by changing the number of rotations of the air suction fan and the number of rotations of the exhaust fan, a set having a lower number of rotations than the air suction fan and the exhaust fan is selected to reduce the power consumption of the air suction motor and the exhaust motor.

6. The air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

the housing assembly has a plurality of air intake holes formed along an outer peripheral edge thereof so as to be adjacent to the air intake port, and the air intake holes are used for sucking external air.

7. The air circulator of claim 1 wherein the dual rotary wing further comprises a wing unit,

the above-mentioned casing assembly includes:

an air suction fan housing for accommodating the air suction fan assembly;

an exhaust fan housing for accommodating the exhaust fan assembly; and

a support body fixedly combined with the air suction fan casing between the air suction fan casing and the exhaust fan casing for fixedly supporting the air suction fan assembly and the exhaust fan assembly,

a plurality of suction holes are formed on one side surface and the outer circumference of the suction fan housing, and the suction holes are used for sucking external air.