KR20200095756A - Fan noise control apparatus - Google Patents

Abstract

An embodiment of the present invention is a fan having a rotation drive unit that provides a driving force to rotate a drive shaft, a fan connected to the drive shaft and having a plurality of blades that rotate around the drive shaft to induce air flow in the extending direction of the drive shaft, and a drive shaft. A guide part accommodating the rotation drive part in the inner space so that the rotation drive part can reciprocate along the extension direction of, a first support part supporting the rotation drive part but reciprocating along the extension direction of the drive shaft together with the rotation drive part, and an extension of the drive shaft Includes a second support portion accommodating at least a portion of the first support portion in an inner space such that the first support portion reciprocates along a direction, one of the first support portion and the second support portion includes a coil, and the first support portion and the first support portion 2. Disclosed is a fan noise control apparatus, wherein the other one of the support parts includes a magnetic member, and when a current is applied to the coil, the rotation drive part reciprocates along the extending direction of the drive shaft in the inner space of the guide part.

Description

Fan noise control device {FAN NOISE CONTROL APPARATUS}

Embodiments of the present invention relate to a fan noise control apparatus, and more particularly, to a fan noise control apparatus capable of generating sound or reducing fan noise using fan noise.

A fan is a component of a mechanical device in which several blades are arranged along a circumferential direction around a rotation axis, and provides rotational force from a driving source such as an electric motor. It is a device that generates a flow of air in one direction by rotating it around a rotation axis.

Fans can be installed in a variety of mechanical devices that require air flow. For example, fans are installed in home appliances such as electric fans, air conditioners, ventilators, refrigerators, air purifiers, computers, etc. to supply air conditioning and heating indoors or forcibly circulate indoor and outdoor air. Also, condensers of air conditioners and refrigerators or computers It can also be used as a cooling fan to cool the central processing unit (CPU).

In addition, the fan may be installed in a compressor that sucks air and compresses it to a high pressure, and thus it may be used in various transportation means such as automobiles, ships, and aircraft in addition to the aforementioned home appliances.

As described above, in the fan, since several blades rotate at high speed around a rotation axis to induce a constant flow of air, the blades and air inevitably collide with each other and generate noise.

Embodiments of the present invention are to provide a fan noise control device capable of generating a desired sound by using the noise generated from the fan.

In addition, embodiments are to provide a fan noise control device capable of reducing the noise generated from the fan.

In addition, embodiments are intended to provide a fan noise control device capable of controlling noise generated from a fan without changing the fan's physical properties such as a fan material, rigidity, and blade thickness.

In the fan noise control apparatus according to an embodiment of the present invention, by installing a vibration system in the axial direction on the fan body, the vibration system may be excited near a natural frequency.

In addition, it is possible to cancel out the noise that is inevitably generated by the rotation of the fan and the sound generated through the vibration of the vibration system.

In addition, instead of changing the properties of the fan, it is possible to change the current value applied to the vibration system installed in the fan body.

An embodiment of the present invention is a fan having a rotation drive unit that provides a driving force to rotate a drive shaft, a fan connected to the drive shaft and having a plurality of blades that rotate around the drive shaft to induce air flow in the extending direction of the drive shaft, and a drive shaft. A guide part accommodating the rotation drive part in the inner space so that the rotation drive part can reciprocate along the extension direction of, a first support part supporting the rotation drive part but reciprocating along the extension direction of the drive shaft together with the rotation drive part, and an extension of the drive shaft Includes a second support portion accommodating at least a portion of the first support portion in an inner space such that the first support portion reciprocates along a direction, one of the first support portion and the second support portion includes a coil, and the first support portion and the first support portion 2. Disclosed is a fan noise control apparatus, wherein the other one of the support parts includes a magnetic member, and when a current is applied to the coil, the rotation drive part reciprocates along the extending direction of the drive shaft in the inner space of the guide part.

In this embodiment, a first protrusion protruding toward the other is formed on one of the outer surface of the rotation drive unit and the inner surface of the guide unit, and the protrusion is seated on the other of the outer surface of the rotation drive unit and the inner surface of the guide unit. The first groove is formed, the first protrusion and the first groove are formed to extend along the extending direction of the driving shaft, and the first protrusion may be slidable with respect to the first groove.

In this embodiment, a bearing housing interposed between the drive shaft and the guide portion to prevent movement of the drive shaft in a direction crossing the extending direction of the drive shaft, and a bearing accommodated in the bearing housing and surrounding the outer peripheral surface of the drive shaft. I can.

In this embodiment, a second protrusion protruding toward the other is formed on one of the outer surface of the bearing housing and the inner surface of the guide unit, and a second protrusion is formed on the other of the outer surface of the bearing housing and the inner surface of the guide unit. A second groove portion in which is seated may be formed, and the second protrusion portion and the second groove portion may be formed to extend along the extending direction of the drive shaft.

In this embodiment, the first support may include a hollow shaft extending in the extending direction of the drive shaft, a coil surrounding an outer surface of the hollow shaft, and an elastic member accommodated in an inner space of the hollow shaft.

In this embodiment, when a current is applied to the coil, the hollow shaft may be reciprocally moved along the extending direction of the drive shaft in the inner space of the second support.

In this embodiment, the first support portion supports one end of the elastic member, the second support portion supports the other end of the elastic member, and the elastic member reciprocates in the extending direction of the drive shaft of the first support portion based on the second support portion. It can elastically allow movement.

In this embodiment, the second support includes a support plate for preventing expansion of the elastic member in the extending direction of the drive shaft, a fixing member for preventing movement of the elastic member in a direction crossing the extending direction of the driving shaft, and a coil. It may include a magnetic member surrounding the outer circumferential surface of the coil and spaced apart from the coil at a predetermined distance in the radial direction.

In this embodiment, the support plate further includes a cover plate supporting one end of the magnetic member and one end of the elastic member, and the second support portion is formed in a hollow shape to support the other end of the magnetic member, and the magnetic member is a support plate It may be interposed between the and the cover plate.

In the present embodiment, at least a portion of the hollow shaft, the coil and the elastic member is disposed between a space formed between the fixing member and the inner surface of the cover plate, and the fixing member and the inner surface of the magnetic member. It can be characterized.

In this embodiment, the space formed between the outer surface of the fixing member and the inner surface of the cover plate based on the radial direction may be wider than the sum of the thicknesses of the hollow shaft, the coil, and the elastic member. .

In this embodiment, the space formed between the outer surface of the fixing member and the inner surface of the magnetic member based on the radial direction may be wider than the sum of the thicknesses of the hollow shaft, the coil, and the elastic member.

In this embodiment, based on the radial direction, the space formed between the outer surface of the fixing member and the inner surface of the cover plate and the space formed between the outer surface of the fixing member and the inner surface of the magnetic member are substantially the same. It can be characterized.

In this embodiment, the first support includes a magnetic member that surrounds the guide and is disposed to be spaced apart from the outer surface of the guide by a predetermined distance in a radial direction, a support frame for supporting the rotation driving part and the magnetic member, and the guide part and the support frame It may include an elastic member interposed between the guide portion to allow the reciprocating movement in the extending direction of the drive shaft of the support frame.

In this embodiment, the second support portion surrounds the guide portion and is disposed in a space between the guide portion and the magnetic member, and surrounds the magnetic member and is arranged to be spaced apart from the outer surface of the magnetic member by a predetermined distance in the radial direction. It may include a second stator and a coil accommodated in the second stator and disposed to be spaced apart from the outer surface of the magnetic member by a predetermined distance in a direction.

In the present embodiment, when current is applied to the coil, the magnetic member may reciprocate in a space between the first stator and the second stator along the extending direction of the drive shaft.

In this embodiment, a width of a space formed between the first stator and the second stator based on the radial direction may be wider than the thickness of the magnetic member.

According to the fan noise control apparatus according to the embodiments of the present invention as described above, by installing a vibration system in the axial direction on the fan body, the vibration system is excited near the natural frequency, thereby minimizing electrical input and maximizing sound output. have.

In addition, noise generated from the fan may be reduced by generating sound through vibration of a vibration system installed in the fan body, and canceling it with noise that is inevitable according to the rotation of the fan.

In addition, the amount of noise generated by the fan can be controlled by changing the current value applied to the vibration meter installed in the fan body instead of changing the fan's physical properties.

Of course, the scope of the embodiments of the present invention is not limited by these effects.

Embodiments of the present invention can be easily understood by a combination of the following detailed description and accompanying drawings, and reference numerals denote structural elements.
1 is a conceptual diagram showing a schematic structure of an air conditioner in which a fan noise control device according to embodiments of the present invention can be installed.
2 is an exploded perspective view showing each component of a fan noise control apparatus according to an embodiment of the present invention.
3 is a cross-sectional view showing a cross-sectional view of the fan noise control device according to an exemplary embodiment of the present invention in an extension direction of a rotation shaft.
FIG. 4 is a cross-sectional view taken along line A-A' of FIG. 3.
5 is a cross-sectional view taken along line B-B' of FIG. 3.
6 is a cross-sectional view illustrating a fan noise control device according to another exemplary embodiment of the present invention, cut in an extension direction of a rotation shaft.
7 is a graph showing an example of BPF noise phase control of a fan.
8 is a graph showing an example of reducing the BPF noise of a fan.

Terms used in the present specification have selected general terms that are currently widely used as possible while considering the functions of the embodiments of the present invention, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like.

In addition, in certain cases, some terms are arbitrarily selected by the applicant, and in this case, their meanings will be described in detail in the description of the applicable invention. Therefore, the terms used in this specification should be defined based on the meaning of the term and the contents throughout the specification, not the name of a simple term.

In addition, when a part of the specification "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

In addition, regardless of the reference numerals, the same or corresponding components are given the same reference numbers and duplicate descriptions thereof will be omitted, and the size and shape of each component member shown for convenience of explanation may be exaggerated or reduced. have

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the embodiments of the present invention belong can easily implement. However, embodiments of the present invention may be implemented in various different forms, and are not limited to the embodiments described herein.

1 is a conceptual diagram showing a schematic structure of an air conditioner in which a fan noise control device according to embodiments of the present invention can be installed.

Referring to FIG. 1, the air conditioner 50 in which the fan noise control device 100 according to an embodiment of the present invention is installed includes a compressor 51, an indoor heat exchanger 52, a first expansion valve EV_1, It includes a second expansion valve (EV_2) and an outdoor heat exchanger (53). In the illustrated embodiment, “I” may indicate an indoor unit and “O” may indicate an outdoor unit.

Specifically, the outdoor unit O includes an outdoor heat exchanger 53 for exchanging outdoor air and refrigerant during a heating operation, an outdoor fan 54 provided on one side of the outdoor heat exchanger 53, and an outdoor heat exchanger 53 It may include a first expansion valve (EV_1) for expanding the refrigerant introduced into the tank, and a compressor 51 for compressing the refrigerant discharged from the outdoor heat exchanger 53.

In addition, the indoor unit (I) is an indoor heat exchanger 52 through which the refrigerant discharged from the compressor 51 flows in during a heating operation, an indoor fan 55 provided on one side of the indoor heat exchanger 52, and during defrost operation. A second expansion valve EV_2 for controlling the flow rate of the refrigerant flowing into the indoor heat exchanger 52 may be provided.

The compressor 51 is formed to compress the refrigerant. That is, the compressor 51 may be formed to pressurize a low-temperature, low-pressure refrigerant to form a high-temperature, high-pressure refrigerant. One or more compressors 51 may be provided in the air conditioner 50.

For example, when a plurality of compressors 51 are provided in the air conditioner 50, the plurality of compressors 51 may be provided in series and/or in parallel along the flow direction of the refrigerant.

The indoor heat exchanger 52 may be formed to heat exchange with indoor air. That is, the indoor heat exchanger 52 may be formed to heat exchange between indoor air and a refrigerant flowing into the indoor heat exchanger 52.

For example, the indoor heat exchanger 52 may perform a function of an evaporator in a cooling mode of the air conditioner 50 and a function of a condenser in a heating mode. In addition, a plurality of indoor heat exchangers 52 may be provided in one indoor unit, or one may be provided in each of the plurality of indoor units.

The outdoor heat exchanger 53 may be formed to heat exchange with outdoor air. That is, the outdoor heat exchanger 53 may be formed to heat exchange between outdoor air and a refrigerant flowing into the outdoor heat exchanger 53.

For example, the outdoor heat exchanger 53 may function as a condenser in a cooling mode of the air conditioner 50 and may function as an evaporator in a heating mode. In addition, a plurality of outdoor heat exchangers 53 may be provided in one outdoor unit, or one may be provided in each of the plurality of outdoor units.

The indoor heat exchanger 52 and the outdoor heat exchanger 53 may be fin-tube heat exchangers. In addition, an indoor fan 55 may be provided on the side of the indoor heat exchanger 52, and an outdoor fan 54 may be provided on the side of the outdoor heat exchanger 53.

The air conditioner 50 may include an oil separator 56 for separating oil from a mixer of oil and refrigerant discharged from the compressor 51.

The oil separator 56 may be formed to separate oil from a mixer of oil and refrigerant discharged from the compressor 51 and supply it to the compressor 51 again. In addition, the refrigerant separated from the mixer introduced into the oil separator 56 may circulate through a refrigerant cycle including the indoor heat exchanger 52 and the outdoor heat exchanger 53.

For example, the mixer discharged from the compressor 51 may be supplied to the oil separator 56 through the supply passage 57. In addition, the liquid oil separated by the oil separator 56 is supplied to the compressor 51 again through the recovery passage 58, and the gaseous refrigerant separated by the oil separator 56 may circulate through the refrigerant cycle.

The air conditioner 50 may include a flow path switching valve 59 for switching the circulation direction of the refrigerant when the cooling mode and the heating mode are switched. The flow path switching valve 59 may be formed as a four-way valve.

For example, the flow path switching valve 59 may be formed to guide the refrigerant discharged from the compressor 51 to the outdoor unit in the cooling mode, and to guide the refrigerant discharged from the compressor 51 to the indoor unit in the heating mode.

The first expansion valve EV_1 is provided in the outdoor unit O, is formed and arranged to expand the refrigerant flowing into the outdoor heat exchanger 53 when the air conditioner 50 is operated in the heating mode, and air conditioning When the machine 50 is operated in a defrost mode or a cooling mode, it may be formed to be fully open.

The second expansion valve EV_2 is provided in the indoor unit I, and when the air conditioner 50 is operated in the heating mode, the flow rate of the refrigerant flowing in the indoor unit I is adjusted according to the outdoor temperature and the set heating temperature. The opening degree can be adjusted so that.

In addition, when the air conditioner 50 is operated in the defrost or cooling mode, the second expansion valve EV_2 expands the refrigerant flowing into the indoor heat exchanger 52 and adjusts the opening degree to adjust the flow rate of the refrigerant. I can.

1 is a diagram showing an example of a mechanical device in which the fan noise control device 100 according to an embodiment of the present invention can be installed. As described above, the fan noise control device 100 includes an air conditioner 50 ) Can be installed in the compressor 51, the outdoor fan 54 and the indoor fan 55. In order to clearly indicate this point in Fig. 1, it is noted that the reference numeral 100 is added to the end of the reference numerals for the compressor 51, the outdoor fan 54, and the indoor fan 55, respectively.

In addition to the air conditioner 50 shown in FIG. 1, the fan noise control apparatus 100 (refer to 200 in FIG. 6) according to the embodiments of the present invention includes an electric fan, a ventilator, a refrigerator, an air purifier, and a computer as described above. It can be installed in a variety of transportation means such as home appliances, automobiles, ships, aircraft, etc., and can also be used as a speaker that reproduces a desired sound by structural features that will be described in detail below.

Hereinafter, a fan noise control device capable of reducing noise generated from the outdoor fan 54 and the indoor fan 55 of the air conditioner 50 illustrated in FIG. 1 or generating a desired sound with reference to other drawings (100) will be described in detail.

FIG. 2 is an exploded perspective view showing each configuration of a fan noise control device according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the fan noise control device according to an embodiment of the present invention in an extension direction of a rotation shaft It is a sectional view showing.

2 and 3, the fan noise control device 100 accommodates a fan 110 that generates and induces air flow in one direction by rotation, and a drive shaft 111 of the fan 110 in an internal space. The first support part 130 that elastically supports the guide part 120, the rotation drive part 112, and the first support part 130 in a fixed state installed in another predetermined structure not shown in the drawing. It may include a second support 140 for supporting.

The fan 110 is connected to the drive shaft 111 and a rotation drive unit 112 that provides a driving force to rotate the drive shaft 111 and rotates around the drive shaft 111 to extend the drive shaft 111 It may include a plurality of blades 113 to induce the flow of air in the direction.

The drive shaft 111 is a rotation center of the plurality of blades 113, and the plurality of blades 113 may be provided to extend in a radial direction with respect to the drive shaft 111, respectively.

Although not shown in the drawing, the fan 110 is formed in a ring-ship and has a rotation center hole (not shown) that accommodates the drive shaft 111 at the center, and a plurality of blades 113 are predetermined along the periphery. Hubs (not shown) that are spaced apart from each other may be provided.

The rotation drive unit 112 may be an electric motor that generates rotational force using electricity as a driving source, but is not limited thereto and may include any configuration capable of rotating the fan 110.

Meanwhile, the drive shaft 111 and the rotation drive unit 112 may be coupled to each other through a coupler 111c.

The plurality of blades 113 may be installed to be spaced apart by a predetermined distance along the circumference of the hub, and preferably, the plurality of blades 113 may be installed to be spaced apart at the same distance. The plurality of blades 113 may be arranged to be inclined in a predetermined direction to induce the flow of air in one direction.

The guide part 120 may be a kind of hollow pipe that extends along the extending direction of the drive shaft 111, and the rotation driving part 112 can reciprocate along the extending direction of the drive shaft 111 in the inner space. To be able to accommodate the rotation drive unit 112.

According to the drawing, the cut surface of the rotation drive unit 112 based on a direction crossing the extension direction of the drive shaft 111, specifically, a direction perpendicular to the drive shaft 111 (ie, a horizontal direction) is circular. ), but embodiments are not limited thereto.

For example, the rotation drive unit 112 may be configured in any shape capable of accommodating the rotation drive unit 112 in the inner space. That is, the guide unit 120 may have various cross-sectional shapes such as ovals, polygons, etc. in addition to circular, as long as it has an internal space capable of accommodating the rotation drive unit 112 therein, and preferably, the rotation drive unit 112 It may have a shape corresponding to the shape of the outer surface of the. A description of the contact surface between the rotation driving unit 112 and the guide unit 120 will be described in detail below with reference to FIGS. 4 and 5.

The first support part 130 supports the rotation driving part 112, but the hollow shaft 131 extending in the extending direction of the driving shaft 111, the coil 132 surrounding the outer surface of the hollow shaft 131, It may include an elastic member 133 accommodated in the inner space of the hollow shaft 131.

Specifically, the first support unit 130 is moved together with the rotation driving unit 112 in a state in contact with one surface of the rotation driving unit 112 reciprocating along the extending direction of the driving shaft 111 in the guide unit 120 internal space. I can.

The first support part 130 may be combined with one surface of the rotation driving part 112 to be integrally configured, but preferably, it is manufactured as a separate component from the rotation driving part 112 so that the elastic force of the elastic member 133 to be described later As a result, it maintains contact with the rotation drive unit 112 and can reciprocate along the extension direction of the drive shaft 111 together with the rotation drive unit 112.

The hollow shaft 131 is formed extending in the opposite direction from the side in contact with the rotation driving unit 112, and it is preferable that the cross section is formed in a hollow annular shape, such as the guide unit 120, but embodiments are not limited thereto. Does not.

That is, the hollow shaft 131 may also be formed in various shapes such as a circle, an ellipse, and a polygon in the same cross-sectional shape as the guide portion 120, and preferably has a shape corresponding to the outer surface shape of the elastic member 133 As a result, it is preferable to have a structure in which the elastic member 133 is in close contact with the inner surface of the hollow shaft 131.

The coil 132 is disposed to surround the outer surface of the hollow shaft 131 and may be connected to an external power source (not shown) although not shown in the drawing. When a current is applied to the coil 132 through an external power source, a description of how the rotation drive unit 112 and the first support unit 130 move will be described in detail together with the description of the second support unit 140 below. It will be described as.

The elastic member 133 is accommodated in the inner space of the hollow shaft 131 so that the first support part 130 can reciprocate with respect to the second support part 140 to be described later, so that the first support part 130 and the second support part 140 ) Can provide elasticity between. For example, the elastic member 133 may include a spring.

The second support part 140 accommodates the first support part 130 in the inner space so that the first support part 130 reciprocates along the extending direction of the drive shaft 111, but elasticity in the extending direction of the drive shaft 111 A support plate 141 that prevents expansion of the member 133, a fixing member 142 that prevents movement of the elastic member in a direction crossing the extending direction of the drive shaft 111, and the outer peripheral surface of the coil 132 It may include a magnetic member 143 that is enclosed and spaced apart from the coil 132 at a predetermined distance in the radial direction.

The support plate 141 may support one end of the magnetic member 143 and one end of the elastic member 133. Specifically, the support plate 141 is supported by other components of a mechanical device not shown in the drawing or coupled with other components, thereby fixing the second support part 140 so that the second support part 140 does not deviate from a predetermined position. Can play a role.

According to this structure, the support plate 141 may fix one end of the elastic member 133 at a predetermined position so that the elastic member 133 does not expand in a direction opposite to the direction toward the rotation driving unit 112.

On the other hand, from the viewpoint of the elastic member 133, the other end of the elastic member 133 is accommodated in the inner space of the first support unit 130 to elastically press the first support unit 130, so the elastic member ( 133 may be freely expanded or contracted along the extending direction of the driving shaft 111 together with the first support part 130.

That is, the first support unit 130 supports one end of the elastic member 133, the second support unit 140 supports the other end of the elastic member 133, and the elastic member 133 is the second support unit 140 A reciprocating movement of the first support part 130 in the extending direction of the driving shaft 111 may be elastically allowed.

The fixing member 142 is fitted in the inner space of the elastic member 133 to prevent the elastic member 133 from moving in a direction crossing the extending direction of the driving shaft 111, for example, in a horizontal direction in the drawing.

That is, the fixing member 142 serves as a kind of guide so that the elastic member 133 can reciprocate only along the extension direction of the drive shaft 111, that is, the vertical direction inside the hollow shaft 131 of the first support part 130. Can be done.

In addition, the fixing member 142 is preferably formed to extend in the extending direction of the drive shaft 111 so as to have a length corresponding to the length of the elastic member 133, but embodiments are not limited thereto. For example, the fixing member 142 may be formed to have a predetermined length so that the elastic member 133 is not deformed along the horizontal direction by fixing the elastic member 133 so that the elastic member 133 does not move along the horizontal direction. I can.

The magnetic member 143 surrounds the outer circumferential surface of the coil 132 and may be spaced apart from the coil 132 by a predetermined distance in the radial direction. The magnetic member 143 may include one or more of a permanent magnet and an electromagnet, but it may be preferably made of a permanent magnet.

The support plate 141 of the second support part 140 supports one end of the magnetic member 143 and one end of the elastic member 133, and the second support part 140 is formed in a hollow shape to prevent the magnetic member 143. It further includes a cover plate 144 supporting the other end, and the magnetic member 143 may be interposed between the support plate 141 and the cover plate 144.

Specifically, at least a portion of the hollow shaft 131, the coil 132, and the elastic member 133 has a space formed between the inner surface of the fixing member 142 and the cover plate 144, and the fixing member 142 It may be disposed between the spaces formed between the inner surface of the magnetic member 143.

At this time, the space formed between the inner surface of the fixing member 142 and the cover plate 144 based on the radial direction is greater than the sum of the thicknesses of the hollow shaft 131, the coil 132, and the elastic member 133. It can be characterized by a wider one. That is, the hollow shaft 131, the coil 132, and the elastic member 133 are fixed at a predetermined position by the fixing member 142, and the inner surface of the cover plate 144 is the outer surface of the coil 132 and It may be arranged to be spaced apart by a predetermined interval.

In addition, the space formed between the inner surface of the fixing member 142 and the magnetic member 143 based on the radial direction is wider than the sum of the thicknesses of the hollow shaft 131, the coil 132, and the elastic member 133, respectively. It can be characterized. That is, the hollow shaft 131, the coil 132, and the elastic member 133 are fixed at a predetermined position by the fixing member 142, and the inner surface of the magnetic member 143 is the outer surface of the coil 132 and It may be arranged to be spaced apart by a predetermined interval.

In addition, the fan noise control device 100 is interposed between the drive shaft 111 and the guide unit 120 to prevent movement of the drive shaft 111 in a direction crossing the extending direction of the drive shaft 111 ( 150) and a bearing 160 accommodated in the bearing housing 150 and surrounding the outer circumferential surface of the drive shaft 111 may be further included.

In the fan noise control device 100 having the configuration as described above, if a current is applied to the coil 132, an electromagnetic field is formed between the coil 132 and the magnetic member 143, and this In the electromagnetic field, the rotation drive unit 112 is capable of reciprocating movement along the extending direction of the drive shaft 111 in the inner space of the guide unit 120.

In addition, according to the reciprocating movement of the rotation driving unit 112, the hollow shaft 131 of the first support unit 130 may also reciprocate along the extending direction of the drive shaft 111 in the inner space of the second support unit 140.

Here, the rotation drive unit 112 and the first support unit 130 supporting the rotation drive unit 112 "can reciprocate along the extending direction of the drive shaft 111" means that the rotation drive unit 112 and the first support unit 130 ) May mean that it can vibrate along the extending direction of the guide part 120.

Specifically, when a sine wave alternating current is applied to the coil 132, the rotation drive unit is driven by the electromagnetic exciting force induced between the coil 132 and the magnetic member 143 ( 112 may vibrate in the form of a sinusoidal wave along the extending direction of the driving shaft 111 in the inner space of the guide unit 120.

According to the above-described structure, when the rotation drive unit 112 reciprocates along the extension direction of the drive shaft 111, that is, when it vibrates, the drive shaft 111, the plurality of blades 113, and the first support unit 130 are also It may vibrate along the extending direction of the drive shaft 111.

That is, when sinusoidal AC power is applied to the coil 132, the fan 110 and the first support unit 130 may vibrate along the extending direction of the drive shaft 111, and the fan 110 and the first support unit ( A predetermined sound corresponding to the frequency and amplitude of the sinusoidal AC applied to the coil 132 may be generated by the vibration of 130).

Specifically, when the frequency of the sinusoidal AC power applied to the coil 132 is changed, the ratio of the electric input applied to the coil 132 to the sound generated by the fan noise control device 100 may also be changed.

This is the fan noise control device 100 including the fan 110, the guide unit 120, the first support unit 130 and the second support unit 140, the frequency of the sinusoidal AC power applied to the coil 132 When set to a frequency near the natural frequency of one vibration system, it means that the vibration of the fan noise control device 100 can be maximized with a minimum electric input.

That is, when the natural frequency of the fan noise control apparatus 100 is matched to the frequency corresponding to the sound to be generated, the maximum sound output may be possible with the minimum electrical input.

Hereinafter, with reference to Figs. 4 and 5, a description will be made on what structural principle the rotation driving unit 112 and the first support unit 130 can move when a current is applied to the coil 132 through an external power source. .

4 is a cross-sectional view taken along line A-A' of FIG. 3, and FIG. 5 is a cross-sectional view taken along line line-B' of FIG. 3.

Referring to FIG. 4, a first protrusion 112p is formed on the outer surface of the rotation drive unit 112, and a first groove 120a on which the first protrusion 112p is seated is formed on the inner surface of the guide unit 120. I can. The first protrusion 112p and the first groove 120a may be formed to extend along the extending direction of the driving shaft 111. The first protrusion 112p is slidable with respect to the first groove 120a, and according to this structure, the rotation drive unit 112 can vibrate along the extending direction of the drive shaft 111 in the inner space of the guide unit 120. have.

In the drawings, the first protrusion 112p is depicted as being formed on the outer surface of the rotation driving portion 112 and the first groove 120a is formed on the inner surface of the guide portion 120, but embodiments are not limited thereto. For example, the first protrusion 112p may be formed on the inner surface of the guide portion 120 and the first groove portion 120a may be formed on the outer surface of the rotation drive unit 112. However, in the following description, for convenience of explanation, the first protrusion 112p is formed on the outer surface of the rotation drive unit 112 and the first groove 120a is formed on the inner surface of the guide unit 120. do.

5, a second protrusion 150p is formed on the outer surface of the bearing housing 150, and a second groove 120b on which the second protrusion 150p is seated is formed on the inner surface of the guide unit 120. I can. The second protrusion 150p and the second groove 120b may be formed to extend along the extending direction of the driving shaft 111. The second protrusion 150p is slidable with respect to the second groove 120b, and according to this structure, the bearing housing 150 can vibrate along the extending direction of the drive shaft 111 in the inner space of the guide part 120. have.

In the drawings, the second protrusion 150p is depicted as being formed on the outer surface of the bearing housing 150 and the second groove 120b is formed on the inner surface of the guide portion 120, but embodiments are not limited thereto. For example, the second protrusion 150p may be formed on the inner surface of the guide portion 120 and the second groove portion 120b may be formed on the outer surface of the bearing housing 150. However, in the following description, for convenience of explanation, the second protrusion 150p is formed on the outer surface of the bearing housing 150 and the second groove 120b is formed on the inner surface of the guide unit 120. do.

6 is a cross-sectional view illustrating a fan noise control device according to another exemplary embodiment of the present invention, cut in an extension direction of a rotation shaft.

Referring to FIG. 6, the fan noise control device 200 includes a fan 210 for generating and inducing a flow of air in one direction by rotation, and a guide for accommodating the drive shaft 211 of the fan 210 in an internal space. It is arranged to surround the part 220, the first support part 230 elastically supporting the rotation drive part 212, and the guide part 220 to induce an electromagnetic excitation force by the arrangement relationship with the first support part 230 It may include a second support portion 240.

The fan 210 is connected to the drive shaft 211 and a rotation drive unit 212 that provides a driving force to rotate the drive shaft 211 and the drive shaft 211 to rotate around the drive shaft 211 to extend the drive shaft 211 It may include a plurality of blades 213 for inducing the flow of air in the direction.

The drive shaft 211 is a rotation center of the plurality of blades 213, and the plurality of blades 213 may be provided to extend in a radial direction about the drive shaft 211, respectively.

Although not shown in the drawing, the fan 210 is formed in a ring-ship and has a rotation center hole (not shown) that accommodates the drive shaft 211 at the center, and a plurality of blades 213 are predetermined along the periphery. Hubs (not shown) that are spaced apart from each other may be provided.

The rotation driving unit 212 may be an electric motor that generates rotational force using electricity as a driving source, but is not limited thereto and may include any configuration capable of rotating the fan 210.

Meanwhile, the drive shaft 211 and the rotation drive unit 212 may be coupled to each other through a coupler 211c.

The plurality of blades 213 may be installed to be spaced apart by a predetermined distance along the circumference of the hub, and preferably, the plurality of blades 213 may be installed to be spaced apart at the same distance. The plurality of blades 213 may be arranged to be inclined in a predetermined direction to induce the flow of air in one direction.

The guide part 220 may be a kind of hollow pipe that extends along the extending direction of the drive shaft 211, and the rotation driving part 212 can reciprocate along the extending direction of the drive shaft 211 in the inner space. The rotation drive unit 212 can be accommodated so as to be.

According to the drawing, the cut surface of the rotation driving unit 212 based on a direction crossing the extension direction of the driving shaft 211, specifically, a direction perpendicular to the driving shaft 211 (ie, a horizontal direction) is circular. ), but embodiments are not limited thereto.

For example, the rotation driving unit 212 may be configured in any shape capable of accommodating the rotation driving unit 212 in an internal space. That is, the guide unit 220 may have various cross-sectional shapes such as ovals, polygons, etc. in addition to circular, as long as it has an internal space capable of accommodating the rotation driving unit 212 therein, and preferably the rotation driving unit 212 It may have a shape corresponding to the shape of the outer surface of the. Since the contact surface between the rotation drive unit 212 and the guide unit 220 has been described in detail with reference to 4 and 5 above, further details will be omitted below.

The first support part 230 surrounds the guide part 220 and supports a magnetic member 231 disposed to be spaced apart from the outer surface of the guide part 220 by a predetermined distance, the rotation drive part 212 and the magnetic member 231 It is interposed between the support frame 232 and the guide unit 220 and the support frame 232 to allow movement of the support frame 232 in the extending direction of the drive shaft 211 with respect to the guide unit 220 It may include an elastic member 233.

In addition, the magnetic member 231 may be installed outside the elastic member 233 on the support frame 232 in a radial direction. That is, the magnetic member 231 may surround the elastic member 233 so as to be spaced apart from the outer surface of the elastic member 233 in a radial direction by a predetermined distance.

The support frame 232 supports the other side of the rotation driving unit 212 that is opposite to one side of the rotation driving unit 212 connected to the driving shaft 211 and the other end of the elastic member 233 supporting the guide unit 220 at one end. It can be moved together with the rotation driving unit 212 in one state.

The support frame 232 may be combined with one surface of the rotation drive unit 212 and may be integrally configured, but preferably, it is manufactured as a separate component from the rotation drive unit 212, and is rotated by the elastic force of the elastic member 233 ( 212) and can be reciprocated along the extending direction of the drive shaft 211 together with the rotation driving unit 212.

The elastic member 233 has both ends installed on the support frame 232 of the guide part 220 and the first support part 230, respectively, and a rotation drive part along the extending direction of the drive shaft 211 with respect to the guide part 220 It is possible to assist the reciprocating movement of the 212 and the first support 230. For example, the elastic member 233 may include a spring.

In other words, the elastic member 233 moves in a direction away from the blade 213 and the rotation drive part 212 and the first support part 230 within a range in which the rotation drive part 212 does not deviate from the guide part 220 Alternatively, on the contrary, it may also be allowed to move in a direction in which the rotation driving part 212 and the first support part 230 approach the blade 213.

The second support part 240 surrounds the guide part 220 and surrounds the first stator 241 and the magnetic member 231, which is disposed in a space between the guide part 220 and the magnetic member 231, and surrounds the magnetic member. A second stator 242 disposed to be spaced apart from the outer surface of the 231 in a radial direction by a predetermined distance, and accommodated in the second stator 242 and disposed to be spaced apart from the outer surface of the magnetic member 231 by a predetermined distance in the radial direction A coil 243 may be included.

Both the first stator 241 and the second stator 242 may include a magnetic material, and although not separately shown or indicated in the drawing, they are provided by a different support member separate from the guide unit 220. It may be fixed around the guide part 220 so as to surround the guide part 220.

A predetermined air gap may be formed between the first stator 241 and the second stator 242, and a magnetic member 231 may be provided in the space between the first stator 241 and the second stator 242. ) Can be located. At this time, the magnetic member 231 may be disposed to be spaced apart from the first stator 241 and the second stator 242 at a predetermined interval, respectively, which is the magnetic member 231 is the first stator 241 and the first stator 241 2 It means that it does not contact the stator 242.

The first stator 241 may be disposed in the inner space of the magnetic member 231 and installed to surround the circumference of the guide unit 220, and the second stator 242 may be provided with a predetermined outer circumference of the magnetic member 231 It is spaced apart to wrap around the outer circumference of the magnetic member 231.

An installation groove (not shown) for accommodating the coil 243 may be formed in the second stator 242, and the installation groove may accommodate the coil 243 along the circumferential direction on the inner surface of the second stator 242. So that it can be formed in an annular shape.

The coil 243 may be accommodated in the second stator 242 and surround a part of the outer surface of the first stator 241 and may be installed to be spaced apart from the outer surface of the first stator 241 by a predetermined distance. Further, although not shown in the drawing, the coil 243 may be connected to an external power source.

A predetermined space may be formed between the first stator 241 and the coil 243, and a magnetic member 231 may be disposed in the space between the first stator 241 and the coil 243.

In addition, the fan noise control device 200 is interposed between the drive shaft 211 and the guide unit 220 to prevent movement of the drive shaft 211 in a direction crossing the extending direction of the drive shaft 211 ( 250) and a bearing 260 accommodated in the bearing housing 250 and surrounding the outer peripheral surface of the drive shaft 211 may be further included.

In the fan noise control apparatus 200 having the configuration as described above, if a current is applied to the coil 243, an electromagnetic field is formed between the coil 243 and the magnetic member 231, and this In the electromagnetic field, the rotation driving unit 212 is capable of reciprocating movement along the extending direction of the driving shaft 211 in the inner space of the guide unit 220.

In addition, as the rotation driving unit 212 reciprocates, the support frame 232 of the first support unit 230 may also reciprocate along the extending direction of the drive shaft 211.

Here, it means that the support frame 232 of the first support part 230 supporting the rotation drive part 212 and the rotation drive part 212 "can reciprocate along the extension direction of the drive shaft 211" means that the rotation drive part 212 It may mean that the and the first support 230 may vibrate along the extending direction of the guide 220.

Specifically, when a sine wave alternating current is applied to the coil 243, the rotation drive unit (by magnetic exciting force) induced between the coil 243 and the magnetic member 231 ( 212) may vibrate in the form of a sinusoidal wave along the extending direction of the driving shaft 211 in the inner space of the guide unit 220.

According to the above-described structure, when the rotation drive unit 212 reciprocates along the extension direction of the drive shaft 211, that is, when it vibrates, the drive shaft 211, a plurality of blades 213, and the first support unit 230 are also It may vibrate along the extending direction of the drive shaft 211.

That is, when sinusoidal AC power is applied to the coil 243, the fan 210 and the first support 230 may vibrate along the extending direction of the drive shaft 211, and the fan 210 and the first support ( A predetermined sound corresponding to the frequency and amplitude of the sinusoidal AC applied to the coil 243 may be generated by the vibration of 230).

Specifically, when the frequency of the sinusoidal AC power applied to the coil 243 is changed, the ratio of the electric input applied to the coil 243 and the sound generated by the fan noise control device 200 may also be changed.

This is, the fan noise control device 200 including the fan 210, the guide unit 220, the first support unit 230 and the second support unit 240, the frequency of the sinusoidal AC power applied to the coil 243 When set to a frequency near the natural frequency of one vibration system, it means that the vibration of the fan noise control device 200 can be maximized with a minimum electrical input.

That is, when the natural frequency of the fan noise control apparatus 200 is matched to the frequency corresponding to the sound to be generated, the maximum sound output may be possible with the minimum electrical input.

7 is a graph showing an example of BPF noise phase control of a fan, and FIG. 8 is a graph showing an example of BPF noise reduction of a fan.

Referring to FIG. 7, the thin line means the first blade pass frequency (BPF) noise generated when the fans 110 and 210 rotate, and the dark line means the fan noise according to embodiments of the present invention. 180 degree phase delay of the primary wing passing frequency sound generated by vibration in the direction of the drive shaft 111 and 211 of the fan 110 and 210 by operating the fans 110 and 210 of the control devices 100 and 200 This is a graph showing an example.

Referring to FIG. 8, the drive shaft 111 and 211 of the fans 110 and 210 are operated by operating the fans 110 and 210 of the fan noise control apparatus 100 and 200 according to embodiments of the present invention. When the phase delay of the primary wing pass frequency sound generated by the directional vibration by 180 degrees, it is possible to reduce the wing pass frequency noise at a specific frequency (for example, between 350 and 400 Hz).

Those of ordinary skill in the technical field related to the embodiments of the present invention will appreciate that the embodiments of the present invention may be implemented in variously modified forms without departing from the essential characteristics of the above description.

Therefore, the disclosed embodiments should be considered in terms of explanation, not limitation. The scope of the embodiments of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the embodiments of the present invention.

50: air conditioner 120, 220: guide part
51: compressor 120a, 220a: first groove
52: indoor heat exchanger 120b, 220b: second groove
53: outdoor heat exchanger 130, 230: first support
54: outdoor fan 131: hollow shaft
55: indoor fan 132, 243: coil
56: oil separator 133, 233: elastic member
57: supply passage 140, 240: second support
58: recovery passage 141: support plate
59: flow path switching valve 142: fixing member
EV_1: first expansion valve 143, 231: magnetic member
EV_2: second expansion valve 144: cover plate
100, 200: fan noise control device 150, 250: bearing housing
110, 210: fan 150p, 250p: second protrusion
111, 211: drive shaft 160, 260: bearing
112, 212: rotation drive unit 232: support frame
112p, 212p: first protrusion 241: first stator
113, 213: blade 242: second stator

Claims (17)

A fan having a rotation drive unit providing a driving force to rotate the drive shaft, and a plurality of blades connected to the drive shaft to rotate around the drive shaft to induce a flow of air in the extending direction of the drive shaft;
A guide part accommodating the rotation drive part in an inner space such that the rotation drive part reciprocates along the extension direction of the drive shaft;
A first support part supporting the rotation driving part and reciprocating along the extending direction of the drive shaft together with the rotation driving part; And
A second support portion accommodating at least a portion of the first support portion in an inner space such that the first support portion reciprocates along the extending direction of the drive shaft; and
One of the first support and the second support includes a coil,
The other of the first support portion and the second support portion includes a magnetic member,
When current is applied to the coil,
The rotation drive unit, characterized in that the reciprocating movement along the extending direction of the drive shaft in the inner space of the guide unit, fan noise control device. According to claim 1,
A first protrusion protruding toward the other is formed on any one of the outer surface of the rotation drive unit and the inner surface of the guide unit,
The other one of the outer surface of the rotation driving part and the inner surface of the guide part is formed with a first groove in which the protrusion is seated,
The first protrusion and the first groove are formed to extend along the extending direction of the drive shaft,
The fan noise control device, characterized in that the first protrusion is slidable with respect to the first groove. According to claim 1,
A bearing housing interposed between the drive shaft and the guide part to prevent movement of the drive shaft in a direction crossing the extending direction of the drive shaft,
The fan noise control device is accommodated in the bearing housing and further comprises a bearing surrounding an outer circumferential surface of the drive shaft. According to claim 3,
A second protrusion protruding toward the other is formed on one of the outer surface of the bearing housing and the inner surface of the guide unit,
The other one of the outer surface of the bearing housing and the inner surface of the guide part is formed with a second groove in which the second protrusion is seated,
The second protrusion and the second groove portion, characterized in that extending along the extending direction of the drive shaft, fan noise control device. According to claim 1,
The first support part,
A hollow shaft extending in the extending direction of the drive shaft,
The coil surrounding the outer surface of the hollow shaft,
Fan noise control device comprising an elastic member accommodated in the inner space of the hollow shaft. The method of claim 5,
When current is applied to the coil,
The hollow shaft is characterized in that the reciprocating movement along the extending direction of the drive shaft in the inner space of the second support, fan noise control device. The method of claim 5,
The first support portion supports one end of the elastic member,
The second support part supports the other end of the elastic member,
The elastic member elastically permits the reciprocating movement of the first support portion in the extending direction of the drive shaft based on the second support portion, fan noise control device. The method of claim 5,
The second support part,
A support plate preventing expansion of the elastic member in the extending direction of the drive shaft,
A fixing member that prevents movement of the elastic member in a direction crossing the extending direction of the drive shaft,
And the magnetic member surrounding the outer circumferential surface of the coil and spaced apart from the coil by a predetermined distance in a radial direction. The method of claim 8,
The support plate supports one end of the magnetic member and one end of the elastic member,
The second support portion further includes a cover plate formed in a hollow shape to support the other end of the magnetic member,
The magnetic member is interposed between the support plate and the cover plate, fan noise control device. The method of claim 9,
At least a portion of the hollow shaft, the coil, and the elastic member,
A space formed between the fixing member and the inner surface of the cover plate,
Fan noise control device, characterized in that disposed between the space formed between the fixing member and the inner surface of the magnetic member. The method of claim 9,
The space formed between the outer surface of the fixing member and the inner surface of the cover plate based on the radial direction is wider than the sum of the thicknesses of the hollow shaft, the coil, and the elastic member, the fan Noise control device. The method of claim 9,
Fan noise, characterized in that the space formed between the outer surface of the fixing member and the inner surface of the magnetic member is wider than the sum of the thicknesses of the hollow shaft, the coil, and the elastic member based on the radial direction controller. The method of claim 9,
Based on the radial direction, the space formed between the outer surface of the fixing member and the inner surface of the cover plate and the space formed between the outer surface of the fixing member and the inner surface of the magnetic member are substantially the same. Characterized in, fan noise control device. According to claim 1,
The first support part,
The magnetic member surrounding the guide portion and disposed to be spaced apart from the outer surface of the guide portion at a predetermined interval in a radial direction,
A support frame for supporting the rotation driving part and the magnetic member,
And an elastic member interposed between the guide part and the support frame to allow reciprocating movement of the support frame in the extending direction of the drive shaft with respect to the guide part. The method of claim 14,
The second support part,
A first stator surrounding the guide part and disposed in a space between the guide part and the magnetic member,
A second stator surrounding the magnetic member and disposed to be spaced apart from the outer surface of the magnetic member at a predetermined interval in a radial direction,
And the coil is accommodated in the second stator and disposed to be spaced apart from the outer surface of the magnetic member by a predetermined distance in a radial direction. The method of claim 15,
When current is applied to the coil,
The magnetic member is characterized in that the reciprocating movement along the extending direction of the drive shaft in the space between the first stator and the second stator, fan noise control device. The method of claim 15,
The fan noise control device, characterized in that the width of the space formed between the first stator and the second stator based on the radial direction is greater than the thickness of the magnetic member.

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