CN110211560B

CN110211560B - Resonance sound absorption structure and air conditioner fan subassembly

Info

Publication number: CN110211560B
Application number: CN201910475770.4A
Authority: CN
Inventors: 赵帅; 薛玮飞; 赵紫生
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2022-02-08
Anticipated expiration: 2039-05-31
Also published as: CN110211560A

Abstract

The invention discloses a resonance sound absorption structure and an air conditioner fan assembly, wherein the resonance sound absorption structure is used for a counter-rotating fan and comprises an air guide ring, and a plurality of slits penetrating through the air guide ring are arranged on the air guide ring; an outer ring layer is sleeved outside the air guide ring, and a plurality of partition plates are arranged on the surface of one side, facing the air guide ring, of the outer ring layer; wind shielding parts are respectively arranged at the two axial ends of the wind guide ring; the wind shielding part, the outer ring layer, the wind guide ring and the adjacent partition plates are enclosed to form a sound absorption cavity, the counter-rotating fan is arranged in the resonance sound absorption structure, and the airflow of the counter-rotating fan enters the sound absorption cavity through the slit. According to the invention, the air guide ring, the partition plate and the outer ring layer form the sound absorption cavity, airflow enters the sound absorption cavity through the slit, the airflow generates vibration friction through the air guide ring, and meanwhile, the airflow generates sound energy loss in the sound absorption cavity, so that the effect of reducing the noise of the low-frequency rotating noise of the cyclone machine is realized.

Description

Resonance sound absorption structure and air conditioner fan subassembly

Technical Field

The invention relates to the field of air conditioning equipment, in particular to a resonance sound absorption structure and an air conditioner fan assembly.

Background

Because counter-rotating axial flow fan has big amount of wind, air supply distance advantage such as far away, so can be applied to the air conditioner field, but counter-rotating axial flow fan has the high shortcoming of noise simultaneously, if install it in user's house, can cause very big disturbing citizen's effect under the high rotational speed condition. At present, under an ultra-far air supply mode, a counter-rotating axial flow fan generally needs to adjust the rotating speed to a high rotating speed due to the requirement of a large air outlet speed. In addition, after the air current enters the fan, the pressure rises under the action of the primary impeller, and on the basis, the secondary impeller continues to work on the fan, so that the air current pressure further rises. The blades uniformly distributed on the working impeller strike the surrounding gas medium to cause periodic pressure pulsation of the surrounding gas, and then huge rotation noise is formed. Such rotational noise is generally loud and low, and can be extremely irritating.

Disclosure of Invention

The invention mainly aims to provide a resonance sound absorption structure and an air conditioner fan assembly, and aims to solve the problem of low-frequency abnormal sound of an existing counter-rotating fan.

In order to achieve the purpose, the resonance sound absorption structure provided by the invention is used for a counter-rotating fan and comprises an air guide ring, wherein a plurality of slits penetrating through the air guide ring are arranged on the air guide ring;

an outer ring layer is sleeved outside the air guide ring, and a plurality of partition plates are arranged on the surface of one side, facing the air guide ring, of the outer ring layer;

wind shielding parts are respectively arranged at the two axial ends of the wind guide ring; the wind shielding part, the outer ring layer, the wind guide ring and the adjacent partition plates are enclosed to form a sound absorption cavity, the counter-rotating fan is arranged in the resonance sound absorption structure, and the airflow of the counter-rotating fan enters the sound absorption cavity through the slit.

Optionally, a blocking edge is arranged at one axial end of the outer ring layer, and the blocking edge is arranged between the outer ring layer and the wind guide ring, so that the blocking edge is configured to be one of the wind shielding members.

Optionally, the blocking edge comprises a plurality of connecting plates, and each connecting plate is connected with the outer ring layer respectively, so that the plurality of connecting plates form a circular ring structure in a surrounding manner;

the tip of connecting plate is equipped with the fixed plate, and is adjacent the tip of connecting plate passes through fixed plate interconnect.

Optionally, a positioning plate is arranged on the air guide ring;

the fixing plates adjacent to the connecting plates are connected in a positioning mode through the positioning plates.

Optionally, the slit is formed for an array of several micro-wells.

Optionally, the slit is a rectangular through hole.

Optionally, the length direction of the slit extends along the circumferential direction of the wind guide ring.

Optionally, ribs are arranged on the outer wall of the wind guide ring;

the ribs separate the sound absorption cavities to form adjacent cavities.

Optionally, the length direction of the partition plates is parallel to the axial direction of the outer ring layer, and the adjacent partition plates are uniformly distributed along the circumferential direction of the outer ring layer.

Optionally, the rib and the air guide ring are coaxially arranged, and the length direction of the rib extends along the circumferential direction of the outer wall of the air guide ring.

The invention provides an air conditioner fan assembly on the basis of the resonance sound absorption structure, which comprises a panel, a motor and the resonance sound absorption structure;

the counter-rotating fan comprises a primary wind wheel and a secondary wind wheel, the axes of which are coincident;

the motor comprises a first motor for driving the primary wind wheel and a second motor for driving the secondary wind wheel;

the first motor is arranged on the resonance sound absorption structure, and the second motor is arranged on the panel.

According to the technical scheme, the air guide ring, the partition plate and the outer ring layer form the sound absorption cavity, airflow enters the sound absorption cavity through the slit, vibration friction is generated by the airflow through the air guide ring, and meanwhile, sound energy loss is generated when the airflow enters the sound absorption cavity through the slit, so that the effect of reducing the noise of low-frequency rotating noise of the cyclone is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of a resonant sound absorbing structure according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of a slit structure of an air-guiding ring according to an embodiment of the present invention;

FIG. 5 is a partial enlarged view of portion A of FIG. 4;

FIG. 6 is a schematic view of an air guide ring with a micro-porous slit according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a portion B in FIG. 6;

FIG. 8 is a front view of FIG. 6;

FIG. 9 is a sectional view taken along line B-B of FIG. 8;

FIG. 10 is an enlarged view of a portion of the portion C of FIG. 9;

FIG. 11 is a schematic view of a structure of a rim and an outer ring layer according to an embodiment of the present invention;

FIG. 12 is a front view of FIG. 11;

FIG. 13 is an enlarged view of a portion D of FIG. 11;

fig. 14 is a schematic structural diagram of an air conditioner fan according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Panel board	11	First motor
12	Second electric machine	13	First-level wind wheel
				14	Two-stage wind wheel	20	Wind-guiding ring
21	Slit	22	Rib
				23	Positioning plate	30	Outer ring layer
31	Partition board	40	Baffle edge
				41	Fixing plate	42	Wind screen
50	Sound absorption cavity

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic view of a resonance sound absorption structure in an embodiment of the present invention, fig. 2 is a front view of fig. 1, and fig. 3 is a cross-sectional view taken along a direction of fig. 2A-a, the present invention provides a resonance sound absorption structure for a counter-rotating fan (not shown in the figure), the resonance sound absorption structure includes an air guiding ring 20, and a plurality of slits 21 penetrating through the air guiding ring 20 are disposed on the air guiding ring 20; an outer ring layer 30 is sleeved outside the air guide ring 20, and a plurality of partition plates 31 are arranged on the surface of one side, facing the air guide ring 20, of the outer ring layer 30; wind shielding pieces 42 are respectively arranged at the two axial ends of the wind guide ring 20; the wind shielding piece 42, the outer ring layer 30, the wind guide ring 20 and the adjacent partition plates 31 are enclosed to form a sound absorption cavity 50, the counter-rotating fan is arranged in the resonance sound absorption structure, and airflow of the counter-rotating fan enters the sound absorption cavity 50 through the slit 21. A cavity is formed between the outer ring layer 30 and the wind guide ring 20, and the wind shielding member 42 is used for sealing two axial ends of the cavity.

When the counter-rotating fan runs, under the action of the counter-rotating fan, an acting force which is collided with the air guide ring 20 is generated on the airflow, when the airflow contacts the air guide ring 20, the airflow enters the sound absorption cavity 50 through the slit 21 on the air guide ring 20, and under the action of the air guide ring 20, the slit 21 and the sound absorption cavity 50, the noise of the counter-rotating fan is reduced.

When the counter-rotating fan operates, the airflow is acted by centrifugal force under the action of the counter-rotating fan, and tends to move towards the air guide ring 20, when the airflow contacts the air guide ring 20, the airflow collides with the air guide ring 20, and the self vibration of the air guide ring 20 brings certain viscous consumption, and because the slit 21 is arranged on the air guide ring 20, when the airflow interacts with the air guide ring 20, the friction loss between the airflow and the air guide ring 20 can play a certain noise reduction effect. Because the sound wave is a mechanical wave, when the sound wave passes through the slit 21, the air and the fine fibers of the material in the slit 21 are caused to vibrate, so that friction and viscous resistance are caused, and further, sound energy is converted into heat energy to be absorbed, so that the sound wave is gradually attenuated, and further, the noise reduction effect of the air guide ring 20 is further improved.

Referring to fig. 4 and 5, fig. 4 is a schematic view of a slit structure of an air guiding ring according to an embodiment of the present invention, fig. 5 is a partially enlarged view of a portion a in fig. 4, after an air flow enters the sound absorbing cavity 50 through the slit 21 on the air guiding ring 20, the air shielding member 42, the air guiding ring 20, the outer ring layer 30 and the adjacent partition plate 31 form the relatively closed sound absorbing cavity 50, the sound absorbing cavity 50 forms a resonator, when a frequency of an incident wave of a sound wave is close to a natural frequency of the resonator, air in the slit 21 may generate strong vibration, and in a vibration process, sound energy is consumed due to a need to overcome frictional resistance, so as to achieve a sound attenuation effect. The low-frequency rotating noise under the rotation of the counter-rotating fan is obviously reduced through the resonance sound absorption structure, the noise of the fan can be reduced, the hearing of a user is greatly improved, and the user experience is improved. Especially in the ultra-far distance blowing mode, low-frequency sound can be remarkably reduced.

In one embodiment of the present invention, the slit 21 may be a rectangular through hole. The resonant frequency calculation formula of the resonant sound absorption structure is as follows:

in the above formula I, c is the sound velocity, S is the penetration rate, L is the air layer thickness, t is the plate thickness, and L is the end correction of the plate thickness.

Wherein:

in the second formula, B is the width of the slit 21, and B is the pitch of the slit 21.

Wherein: the preferable range of S is 10% -25%;

the preferable range of b is 0.2-5 mm;

the preferable range of B is 5-45 mm;

t is preferably in the range of 1-10 mm;

a preferred range of L is 5-50 mm.

Taking the case that the microphone is placed right in front of the cabinet air conditioner (one meter high and one meter far), the low-frequency abnormal sound of the counter-rotating fan is detected:

TABLE 1

As can be seen from the test data in the table 1, the wind wheels at the inner side and the outer side are 700 revolutions per minute, the slit 21 resonance sound absorption structure is adopted, so that the peak value of the low frequency 106 Hz of the counter-rotating fan is reduced to 34.6 dB from 37.8 dB, the peak value is reduced by nearly 3.2 dB, and meanwhile, the total noise value is reduced by 0.6 dB.

Referring to fig. 6, 7 and 8, fig. 6 is a schematic view of a wind-guiding ring with a micro-hole slit according to an embodiment of the present invention, fig. 7 is a schematic view of a portion B in fig. 6, and fig. 8 is a front view of fig. 6. The micropores are arrayed on the wind guide ring 20 according to a certain path, so that the wind guide ring 20 forms a porous structure, the maximum diameter of the micropores is between 0.3 and 5 millimeters, and the perforation rate of the micropores is 1 to 65 percent. Other shapes of through-openings may be used for the slit 21.

Referring to fig. 9 and 10, fig. 9 is a sectional view taken along the direction B-B in fig. 8, and fig. 10 is a partially enlarged view taken along the portion C in fig. 9, a length direction of the slit 21 may extend along the circumferential direction of the wind-guiding ring 20, and the length direction of the wind-guiding ring 20 may also be parallel to the axial direction of the wind-guiding ring 20. Optionally, a plurality of the slits 21 are distributed along the circumferential direction of the wind guide ring 20. The wind-guiding ring 20 can be uniformly distributed on the wind-guiding ring 20, so that the slits 21 are uniformly communicated with the sound-absorbing cavity 50 on the wind-guiding ring 20.

The wind shielding member 42 may be formed by warping the two axial ends of the wind guiding ring 20, so that the wind shielding member 42 forms edge structures at the two ends of the wind guiding ring 20, and when the outer ring layer 30 is sleeved outside the wind guiding ring 20, the wind shielding member 42 is matched with the two axial ends of the outer ring layer 30, so that the two axial ends of the wind guiding ring 20 and the outer ring layer 30 are sealed. The wind shielding members 42 may also be disposed at two axial ends of the outer ring layer 30, and the structure thereof is the same as that of the wind guiding ring 20.

In an embodiment of the present invention, the wind deflector 42 is disposed at one axial end of the wind guide ring 20, a blocking edge 40 is disposed on the outer ring layer 30 at the other axial end of the wind guide ring 20, the blocking edge 40 can be used as the wind deflector 42, and the blocking edge 40 and the wind deflector 42 are respectively used for closing two axial end portions of a cavity formed by the wind guide ring 20 and the outer ring layer 30, so that the wind deflector 42 and the blocking edge 40 seal two opposite end surfaces of the sound absorption cavity 50.

Referring to fig. 11, 12 and 13, fig. 11 is a schematic view illustrating a structure of a retaining edge and an outer ring layer according to an embodiment of the present invention, fig. 12 is a front view of fig. 11, and fig. 13 is an enlarged view of a portion D in fig. 11, in order to improve the sound absorption efficiency of the resonance sound absorption structure to low-frequency abnormal sound, in an embodiment of the present invention, a rib 22 is disposed on an outer wall of the wind guide ring 20; the ribs 22 separate the sound-absorbing chambers 50 to form adjacent chambers. The rib 22 reduces the volume of the sound absorption cavity 50, air flow enters the cavity through the slit 21, under the action of sound waves, air generates vibration friction on the wall surface of the slit 21, and the sound energy loss is increased by utilizing viscous damping and heat conduction.

The partition plates 31 may be uniformly distributed on the outer ring layer 30, and may be non-uniformly distributed; the partition plate 31 may be disposed parallel to the axial direction of the outer ring layer 30, or may be not parallel to the axial direction of the outer ring layer 30.

Optionally, the length direction of the partition plate 31 is parallel to the axial direction of the outer ring layer 30, and the adjacent partition plates 31 are uniformly distributed along the circumferential direction of the outer ring layer 30. The sound absorption cavity 50 formed between the adjacent outer ring layers 30 is of a structure with equal size, the viscous resistance received when the airflow enters the sound absorption cavity 50 through the slit 21 is equal, the generated acoustic energy loss is the same, and the noise caused by the uneven airflow is further avoided.

Optionally, the rib 22 is disposed coaxially with the air guide ring 20, and a length direction of the rib 22 extends along a circumferential direction of an outer wall of the air guide ring 20. The ribs 22, the air guide ring 20, the outer ring layer 30 and the partition plate 31 form the sound absorption cavities 50 at equal intervals.

When the adjacent partition plates 31 are circumferentially distributed along the outer ring layer 30, the partition plates 31 may be provided with grooves corresponding to the positions of the ribs 22, and after the outer ring layer 30 is sleeved on the air guide ring 20, the ribs 22 are embedded in the grooves of the partition plates 31, so as to position the outer ring layer 30, and simultaneously, the outer ring layer 30 is prevented from axially moving relative to the air guide ring 20, so that the stability of the outer ring layer 30 can be improved, and the sound absorption cavity 50 is kept in a constant state, thereby ensuring reliable sound absorption and noise reduction effects.

In an embodiment of the present invention, a sound absorption material is disposed in the sound absorption cavity 50, and the noise reduction effect of the sound absorption cavity 50 is improved by the sound absorption material. The sound absorption material may be a porous material, such as an elastic porous material, and may be pressed against the wind guide ring 20.

In order to facilitate the installation of the blocking edge 40, according to the present invention, optionally, the blocking edge 40 includes a plurality of connecting plates, and each of the connecting plates is respectively connected with the outer ring layer 30, so that the plurality of connecting plates surround to form a circular ring structure; the end parts of the connecting plates are provided with fixing plates 41, and the end parts of adjacent connecting plates are connected with each other through the fixing plates 41. The connecting plate may be integrally formed with the fixing plate 41 such that an end of the connecting plate is warped outward to form the fixing plate 41.

When the connecting plates are installed, the adjacent connecting plates are spliced with each other, the fixing plates 41 on the adjacent connecting plates are connected with each other through screws, and then the connecting plates can be assembled with each other.

The connecting plate can be integrally formed with the outer ring layer 30, and one end of the outer ring layer 30 is bent outwards to form the blocking edge 40, so that the sealing performance between the blocking edge 40 and the outer ring layer 30 is improved, and noise caused by a gap between the outer ring layer 30 and the blocking edge 40 is avoided.

In order to facilitate the installation of the retaining edge 40, in an embodiment of the present invention, a positioning plate 23 is disposed on the wind guiding ring 20; the fixing plates 41 adjacent to the connecting plate are connected by the positioning plate 23. The positioning plate 23 may be disposed on an outer wall of the wind guiding ring 20, the wind guiding ring 20 corresponds to the fixing plate 41 in position, after the position of the outer ring layer 30 is determined, the outer ring layer 30 is sleeved on the wind guiding ring 20, the fixing plates 41 on the adjacent connecting plates are respectively located on two sides of the positioning plate 23, and at this time, screws penetrate through the fixing plates 41 and the positioning plate 23 on the adjacent connecting plates, so that the positioning plate 23 and the fixing plates 41 are connected with each other, and the installation of the retaining edge 40 is achieved.

When the retaining edge 40 and the outer ring layer 30 are integrally formed, after the connecting plate is fixed on the air guide ring 20, the position of the outer ring layer 30 is relatively determined, so that the outer ring layer 30 can be quickly positioned conveniently.

The invention provides an embodiment of an air conditioner fan assembly on the basis of the resonance sound absorption structure.

Referring to fig. 14, fig. 14 is a schematic structural diagram of an air conditioner fan according to an embodiment of the present invention, where the air conditioner fan assembly includes a panel 10, a motor, and the resonance sound absorption structure; the counter-rotating fan comprises a primary wind wheel 13 and a secondary wind wheel 14, the axes of which are coincident; the motor comprises a first motor 11 for driving the primary wind wheel 13 and a second motor 12 for driving the secondary wind wheel 14; the first motor 11 is arranged on the resonance sound absorption structure, and the second motor 12 is arranged on the panel 10.

The counter-rotating fan is arranged on an air duct of the air conditioner fan, and the resonance sound absorption structure is arranged at an inlet of the air conditioner fan.

The contra-rotating fan comprises a primary wind wheel 13 and a secondary wind wheel 14 which are oppositely arranged. The resonance sound absorption structure is used for remarkably reducing the low-frequency rotation noise under the rotation of the counter-rotating fan and simultaneously reducing the noise of the air conditioner fan.

The resonance sound absorption structure can play a good sound absorption and noise reduction effect on low-frequency rotation noise, can improve the hearing of a user and improve the user experience, and particularly can remarkably reduce the low-frequency sound in an ultra-far air supply mode.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A resonance sound absorption structure is used for a counter-rotating fan and is characterized by comprising an air guide ring, wherein a plurality of slits penetrating through the air guide ring are formed in the air guide ring;

wind shielding parts are respectively arranged at the two axial ends of the wind guide ring; the wind shielding part, the outer ring layer, the wind guide ring and the adjacent partition plates are enclosed to form sound absorption cavities, each sound absorption cavity forms a resonator, the natural frequency of each resonator is close to the frequency of incident waves of sound waves in the rotating state of the counter-rotating fan, the counter-rotating fan is arranged in the resonant sound absorption structure, and airflow of the counter-rotating fan enters the sound absorption cavities through the slits so as to reduce low-frequency rotating noise under the rotation of the counter-rotating fan;

the resonant frequency calculation formula of the resonant sound absorption structure is as follows:

in the above-mentioned formula,cat the speed of sound, S is the perforation rate,Lis the thickness of the air layer, t is the thickness of the plate,lcorrecting the tail end of the plate thickness;

wherein:

in the above formula, B is the slit width, B is the slit pitch,

wherein: the range of S is 10-25%, the range of B is 0.2-5mm, the range of B is 5-45mm, the range of t is 1-10mm, and the range of L is 5-50 mm.

2. The resonant sound absorbing structure according to claim 1 wherein the outer layer is provided at one axial end thereof with a ledge, the ledge being disposed between the outer layer and the wind-guiding ring such that the ledge is configured as one of the wind-shielding members.

3. A resonant sound absorbing structure according to claim 2, wherein the ledge comprises a plurality of connecting plates, each connecting plate being connected to the outer race layer, so that the plurality of connecting plates surround to form a circular ring structure;

4. A resonance sound absorbing structure as set forth in claim 3, wherein said air guide ring is provided with a positioning plate;

5. A resonant sound absorbing structure according to claim 1, wherein the slits are formed as an array of a plurality of micro-holes.

6. A resonant sound absorbing structure according to claim 1, wherein the slits are rectangular through holes.

7. The resonant sound absorbing structure of claim 1, wherein the slits have a length extending circumferentially along the wind-directing ring.

8. The resonant sound absorbing structure of claim 1 wherein the outer wall of the wind-directing ring is provided with ribs;

the ribs separate the sound absorption cavities to form adjacent cavities.

9. A resonant sound absorbing structure according to claim 8, wherein the length of the divider plate is parallel to the axial direction of the outer ring layer, and adjacent divider plates are circumferentially and uniformly distributed along the outer ring layer.

10. The resonant sound absorbing structure of claim 9 wherein the ribs are disposed coaxially with the wind-directing ring, the length of the ribs extending circumferentially along the outer wall of the wind-directing ring.

11. An air conditioner fan assembly comprising a panel, a motor and a resonant sound absorbing structure as claimed in any one of claims 1 to 10;