KR101961220B1 - Contra-rotating propeller system for electrical appliances - Google Patents

Abstract

The present invention proposes a counter-rotating propeller system. The propeller system according to an embodiment of the present invention includes a plurality of counter rotating propellers including a front propeller rotating in opposite directions about the same rotational axis, a rear propeller, a front propeller, and a driving unit rotating the rear propeller , And the plurality of counter rotating propellers are disposed on the same rotation axis.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a contra-rotating propeller system for electric home appliances,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter-rotating propeller system used in home appliances.

In general, propellers are used in aircrafts that generate thrust, or as fans for fans and heaters in automobiles.

Here, the propeller used in the aircraft accelerates the air stream approaching from the front suction side to the rear side, that is, to the ejection side, thereby generating the propulsion force. In addition, the fan of the fan and the heat-dissipating propeller of the car act as a counter-propulsive force generation such as the inverse acceleration by sucking the air stream in the rear.

However, the conventional propeller or propeller structure has a problem that noise is generated due to a pressure difference generated at different flow rates during rotation.

This noise is generated by two different flow rates generated on the surface of the propeller when the propeller is rotating.

Here, the two different flow rates refer to an air layer whose flow rate decreases toward the inside of the wing, and an air layer whose air flow rate increases as it moves toward the rim of the other side of the wing. At this time, a pressure difference is generated between the low-speed air layer and the high-speed air layer, so that a vortex is generated in the air layer whose flow rate is increased to generate noise.

Accordingly, in view of the above problems, the present invention has developed a more effective propeller by suppressing noise and frictional resistance generated during rotation and functioning to increase the flying distance of the propeller.

In order to solve this problem, Korean Patent Registration No. 10-0590814 (entitled Propeller With Grooved Wing) discloses a propeller having a plurality of radially extending portions extending clockwise or counterclockwise around the center wing; And grooves formed on the front surfaces of the blades and formed in an elliptical shape having the same curvature and curvature according to the forming direction of the blades, wherein the grooves are uniformly arranged on the surfaces of the blades. And has a wing.

However, such a conventional single fan system raises the pressure of the fluid by the rotation of the fan to generate the flow rate. In addition, in order to have a high flow performance, the number of revolutions per minute of the fan must be increased, which results in increasing the noise.

Especially, the household electric appliances not only cause psychological bad effects such as stress and anxiety due to unpleasant noise caused by the operation of the blowing fan and stimulate the auditory sense of the user, but also cause disturbance of life such as work and learning, There is a need for a low-noise home appliance that can minimize noise when using home appliances because it can cause physiological problems such as autonomic nervousness, hypertension, conception rate and fertility rate, or serious problems in pregnancy and childbirth.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the conventional art and it is an object of the present invention to provide a propulsion system for an electric propulsion system which can disperse power to a plurality of propellers and achieve a high airflow rate even at low rotation speed, And to provide the above objects.

As a technical means to achieve the above object, a counter-rotating propeller system used in a home appliance according to an embodiment of the present invention includes a front propeller, a rear propeller, and a front propeller, And a plurality of counter rotating propellers including a driving unit for rotating the rear propeller, wherein the plurality of counter rotating propellers are disposed on the same rotation axis.

According to the above-mentioned problem solving means of the present invention, it is possible to disperse the power to a plurality of propellers and achieve a high air flow rate even at a low rotation speed, so that the effect of reducing noise can be greatly improved.

In addition, the propeller hub is provided with a driving unit for rotating the propeller.

1 is a perspective view of a counter-rotating propeller system according to an embodiment of the present invention.
2 is a cross-sectional view of a counter-rotating propeller according to an embodiment of the present invention.
FIG. 3 is a view showing a movement path of a fluid in a counter-rotating propeller system according to an embodiment of the present invention.
4 is a view for explaining an exit angle of a front propeller and an entrance angle of a rear propeller according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter-rotating propeller system for use in consumer appliances. The above-described home appliance means household appliances used for living such as a hair dryer, an air conditioner, an air conditioner, a humidifier, and a clothes processing device.

FIG. 1 is a perspective view of a counter-rotating propeller system according to an embodiment of the present invention, FIG. 2 is a sectional view of a counter-rotating propeller according to an embodiment of the present invention, 4 is a view for explaining an exit angle of a front propeller and an entrance angle of a rear propeller according to an embodiment of the present invention.

First, with reference to FIG. 1, a description will be given of a counter rotating propeller system according to an embodiment of the present invention.

The counter-rotating propeller system includes a plurality of counter-rotating propellers (100) spaced apart on the same rotating shaft. Illustratively, the counter-rotating propeller system may include, but is not limited to, two counter-rotating propellers 100, as shown in FIG. 1, .

Referring to FIG. 1, a plurality of the half-rotation propellers 100 may be fixed to the interior of the housing 200 opened front and rear. The plurality of counter rotating propellers 100 are located inside the housing 200 and can discharge the air introduced through the front opening of the housing 200 to the rear opening of the housing 200. Illustratively, the housing 200 may be formed in a cylindrical shape, as shown in Fig. 1, but is not limited thereto.

Hereinafter, with reference to FIG. 2, a description will be given in detail of a counter-rotating propeller 100 according to an embodiment of the present invention.

The counter rotating propeller 100 includes a forward propeller 110 and a rear propeller 120 rotating in opposite directions about the same axis of rotation and driving units 130 and 140 for rotating the forward propeller 110 and the rear propeller 120, .

The forward propeller 110 includes a forward propeller hub 111, a forward shaft 112 having one end coupled to the center of the forward propeller hub 111 and a plurality of radially extending and evenly spaced apart forward propeller hubs 111 And the rear propeller 120 includes a rear propeller hub 121, a rear shaft 122 coupled to the center of the rear propeller hub 121, and a rear shaft 122 coupled to the rear propeller hub 121 in the radial direction And a plurality of rear blades 123 extended and uniformly disposed on the rear blade 123.

Also, the counter-rotating propeller 100 is characterized in that the front propeller 110 and the rear propeller 120 are rotated in opposite directions. In other words, when the front propeller 110 rotates clockwise, the rear propeller 120 rotates counterclockwise, and when the front propeller 110 rotates counterclockwise, the rear propeller 120 rotates clockwise Direction.

Referring to FIG. 2, the driving units 130 and 140 may include a front driving unit 130 for driving the front propeller 110 and a rear driving unit 140 for driving the rear propeller 120.

The front driving part 130 includes a first bearing part 131 to which the front shaft 112 is connected, a first coil part 132 and a first coil part 132 located on the outer circumferential surface of the first bearing part 131, And a first magnet portion 133 spaced apart from the outer circumferential surface of the front propeller hub 111 by a predetermined distance.

In addition, the counter-rotating propeller 100 may further include a first controller 160 for controlling the front driver 130. In addition, the first controller 160 may control the intensity of the voltage supplied to the first coil part 132, the direction of the voltage, and the like. The first control unit 160 controls the speed of the forward propeller 110 by controlling the intensity of the voltage supplied to the first coil unit 132 and supplies the first coil unit 132 with So that the direction in which the front propeller 110 is rotated can be controlled.

The rear driving part 140 includes a second bearing part 141 to which the rear shaft 122 is connected, a second coil part 142 located on the outer peripheral surface of the second bearing part 141, And a second magnet portion 143 spaced apart from the outer circumferential surface of the rear propeller hub 121 by a predetermined distance and positioned on the inner circumferential surface of the rear propeller hub 121.

Further, the counter-rotating propeller 100 may further include a second controller 170 for controlling the rear driver 140. In addition, the second controller 170 can control the intensity of the voltage supplied to the second coil part 142, the direction of the voltage, and the like. The second control unit 170 controls the speed of the rotation of the rear propeller 120 by controlling the intensity of the voltage supplied to the second coil part 142, So that the direction in which the rear propeller 120 rotates can be controlled.

The front drive unit 130 may be located inside the front propeller hub 111 and the rear drive unit 140 may be located inside the rear propeller hub 121. Thus, there is an effect that the size of the counter rotating propeller 100 can be reduced.

2, the counter-rotating propeller 100 further includes a fixed support 150, which has a first coil part 132 and a second coil part 142 on both sides thereof and is fixed to the housing 200 . In other words, the front propeller 110 and the rear propeller 120 are positioned on the front and rear sides of the fixed support 150, respectively, and the first and second coil parts 132 and 132, (142) can be fixed. In addition, at least a portion of the portion corresponding to the front blade 113 can be opened so that the air can be smoothly supplied from the front blade 113 to the rear blade 123.

Referring to Figs. 3 and 4, the design of the blade according to an embodiment of the present invention will be described.

The general counter-rotating propeller (100) has not yet introduced the concept of multi-stage, and the more the multi-stage design, the more the design technique of the blade becomes.

Referring to FIG. 3, as the upper-half rotation propeller 100 is designed in multiple stages, the design of the inlet and outlet angles of the flows flowing into the respective blades becomes very important. By way of example, disturbance of the flow inlet / outlet angle at the leading end causes flow separation at the blade at the rear end, which greatly affects propeller performance. Therefore, the angle of the front blades 113 and the rear blades 123 is a very important factor in a counter-rotating propeller system in which a plurality of counter-rotational propellers 100 are provided side by side. In other words, when the angle of the blade is designed to be correct, as shown in FIG. 3, the velocity vector moves along the angle of the blade, so that the flow smoothly proceeds.

4, the sum of the outflow angle of the front blades 113 and the inflow angle of the rear blades 123 may be 180 degrees. The above-mentioned inlet angle means an angle at which the fluid flows into the blade, and the outlet angle can mean an angle at which the fluid flows out of the blade. Thus, separation of the fluid flowing into the rear blades 123 can be minimized.

Table 1 below is a table comparing the energy efficiencies of a single propeller and a counter-rotating propeller system of the present invention.

type Size
[mm] RPM Torque
[mN * m] Pin
[W] Q
[m3 / min] η
[%] single
prop 74 12000 2.51 3.2 2.1 47 Counterclockwise rotation
prop
system 74 3000 2.55 3.2 2.1 51

As shown in [Table 1], the conventional single propeller has to rotate the propeller at high RPM to achieve high airflow, whereas the anti-rotation propeller system can achieve high airflow efficiency at low RPM, There is an effect that can be greatly reduced.

In addition, the conventional single propeller has to be provided with a motor for supplying high power to rotate the propeller with a high RPM. On the other hand, the propulsion system has a propeller hub (111, 121) So that it is possible to achieve downsizing and weight reduction.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: Anti-rotation propeller
110: front propeller 111: front propeller hub
112: front shaft 113: front blade
120: rear propeller 121: rear propeller hub
122: rear shaft 123: rear blade
130: front drive part 131: first bearing part
132: first coil part 133: first magnet part
140: rear drive part 141: second bearing part
142: second coil part 143: second magnet part
150: Fixed support
160: first control unit 170: second control unit
200: Housing

Claims (6)

In a counter-rotating propeller system for use in a household appliance,
And a plurality of counter rotating propellers including a front propeller rotating in opposite directions about the same rotational axis, a rear propeller, and a driving unit rotating the front propeller and the rear propeller,
Said forward propeller comprising: a forward propeller hub; A front shaft, one end of which is coupled to a center portion of the front propeller hub; And a front blade extending and evenly extending from the forward propeller hub in a radial direction,
The rear propeller includes a rear propeller hub; A rear shaft, one end of which is coupled to the center of the rear propeller hub; And a rear blade extending and evenly extending from the rear propeller hub in a radial direction,
Wherein the driving unit includes a front driving unit for driving the front propeller and a rear driving unit for driving the rear propeller,
Wherein the front drive unit includes: a first bearing unit to which the front shaft is connected; A first coil part located on an outer circumferential surface of the first bearing part; And a first magnet portion spaced apart from an outer circumferential surface of the first coil portion by a predetermined distance and located on an inner circumferential surface of the forward propeller hub,
Wherein the rear driving part includes: a second bearing part to which the rear shaft is connected; A second coil part located on an outer circumferential surface of the second bearing part; And a second magnet portion spaced apart from an outer circumferential surface of the second coil portion by a predetermined distance and located on an inner circumferential surface of the rear propeller hub,
Wherein the counter-rotating propeller is connected to the first coil part to control a strength of a voltage supplied to the first coil part, and a second control part connected to the second coil part, And a second control unit for controlling the intensity of the second signal,
Wherein the plurality of the half-rotation propellers are spaced apart on the same rotation axis.
delete delete The method according to claim 1,
The above-mentioned half-turn propeller
Wherein the first coil part and the second coil part are located on both sides of the first coil part and the second coil part, respectively, and the fixed support is fixed to the housing.
delete The method according to claim 1,
Wherein the sum of the outlet angle of the front blades and the inlet angle of the rear blades is 180 degrees.

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