CN108457903B - Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner - Google Patents
Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner Download PDFInfo
- Publication number
- CN108457903B CN108457903B CN201810095275.6A CN201810095275A CN108457903B CN 108457903 B CN108457903 B CN 108457903B CN 201810095275 A CN201810095275 A CN 201810095275A CN 108457903 B CN108457903 B CN 108457903B
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- Prior art keywords
- centrifugal fan
- fan blade
- groove
- noise reduction
- volute
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- 230000007704 transition Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/424—Double entry casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a noise reduction volute, a backward tilting centrifugal fan and an air conditioner. The noise reduction volute comprises an inner cavity (1) for installing a centrifugal fan blade (2), and a noise reduction groove communicated with the inner cavity (1) is formed in the side wall of the periphery of the inner cavity (1). According to the noise reduction volute, noise of the backward inclined centrifugal fan blade can be reduced, and user experience is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a noise reduction volute, a backward tilting centrifugal fan and an air conditioner.
Background
The energy efficiency requirements of the existing market on window air-conditioning units are higher and higher, and in order to better improve the fan efficiency, many manufacturers start trying to use backward inclined centrifugal fan blades; the retroverted centrifugal fan blade is high in efficiency, but high in noise, so that the experience of a user in use is reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the noise reduction volute, the backward inclined centrifugal fan and the air conditioner, so that the noise of the backward inclined centrifugal fan blade can be reduced, and the use experience of a user is improved.
In order to solve the problems, the invention provides a noise reduction volute, which comprises an inner cavity for installing centrifugal fan blades, wherein a noise reduction groove communicated with the inner cavity is formed in the side wall of the periphery of the inner cavity.
Preferably, the noise reduction groove comprises a front groove arranged on the side wall of the inner cavity, which is positioned on the front side of the centrifugal fan blade; and/or the noise reduction groove comprises a side groove arranged on the side wall of the inner side cavity and positioned on the side face of the centrifugal fan blade.
Preferably, the noise reduction volute comprises a volute tongue, and the side groove is arranged on the volute tongue.
Preferably, the side of the volute tongue facing the centrifugal fan blade is parallel to the rotation axis of the centrifugal fan blade.
Preferably, the width of the inner cavity along the axial direction of the centrifugal fan blade is H4, and the depth of the front groove which is recessed along the axial direction of the centrifugal fan blade towards the direction far away from the inner cavity is H3, wherein H4/20 is less than or equal to H3 is less than or equal to 3H4/10.
Preferably, the front groove is symmetrical about the central axis of the centrifugal fan blade in a plane parallel to the central axis of the centrifugal fan blade and perpendicular to the front wall surface of the inner cavity.
Preferably, the width of the opening of the front groove along the direction perpendicular to the central axis of the centrifugal fan blade is L3, the width of the bottom of the front groove along the direction perpendicular to the central axis of the centrifugal fan blade is L4, wherein L4 is less than L3, and the front groove is in arc transition from the edge of the opening to the edge of the bottom.
Preferably, the side groove comprises a U-shaped groove, the width of the U-shaped groove is H1, the minimum distance between the side wall of the U-shaped groove and the rear side wall of the inner side cavity is H2, and the width of the inner side cavity along the axial direction of the centrifugal fan blade is H4, wherein H4/10 is more than or equal to H1 and less than or equal to 3H4/10; h4/2 is less than or equal to H2 and less than or equal to 4H4/5.
Preferably, the side groove includes a first side, a second side, a third side, a fourth side, a fifth side, and a sixth side connected in this order in a direction from a rear side wall of the inner cavity toward a front side wall of the inner cavity, wherein the first side is connected to the side wall of the inner cavity, the sixth side is connected to the front side wall of the inner cavity, the third side, the fourth side, and the fifth side form a U-shaped groove open toward the inner cavity, and the first side and the second side form a protrusion protruding toward the inner cavity.
Preferably, the included angle between the first side edge and the inner side wall of the inner side cavity connected with the first side edge is alpha 1 = 80-90 degrees; the included angle between the first side edge and the second side edge is alpha 2 = 100-110 degrees; the included angle between the second side edge and the third side edge is alpha 3 = 120-130 degrees; the angle between the third side and the fourth side α4=90°; the included angle between the fourth side edge and the fifth side edge is alpha 5 = 120-130 degrees.
Preferably, the adjacent side edges are in arc transition connection.
According to another aspect of the invention, a backward tilting centrifugal fan is provided, which comprises backward tilting centrifugal fan blades and the noise reduction volute, wherein the centrifugal fan blades are arranged in an inner cavity of the noise reduction volute.
Preferably, when the noise reduction volute comprises a volute tongue, the minimum gap between the centrifugal fan blade and the volute tongue is 10-15 cm.
Preferably, when the width of the opening of the front groove along the direction perpendicular to the central axis of the centrifugal fan blade is L3, the diameter of the centrifugal fan blade is D, and L3 is more than or equal to 0.4D and less than or equal to 0.6D.
Preferably, when the side groove comprises a U-shaped groove, the distance between the bottom wall of the U-shaped groove and the central axis of the centrifugal fan blade is L1, the distance between the top point of the opening of the U-shaped groove and the central axis of the centrifugal fan blade is L2, the diameter of the centrifugal fan blade is D, L1 is more than or equal to 0.38D and less than or equal to 0.42D, and L2 is more than or equal to 0.36D and less than or equal to 0.40D.
According to still another aspect of the present invention, there is provided an air conditioner including a retroverted centrifugal fan, which is the retroverted centrifugal fan described above.
The invention provides a noise reduction volute, which comprises an inner cavity for installing a centrifugal fan blade, wherein a noise reduction groove communicated with the inner cavity is formed in the side wall of the periphery of the inner cavity. Through set up the recess of making an uproar that falls on the lateral wall of the inboard cavity of installation centrifugal fan blade, can reform transform spiral case shape through the recess of making an uproar for spiral case shape and retroverted centrifugal fan blade have better matchability, improve the air flow characteristic of retroverted centrifugal fan blade in the spiral case, eliminate pneumatic noise excitation source, reduce the noise of retroverted centrifugal fan blade.
Drawings
FIG. 1 is a cross-sectional block diagram of a noise reduction volute of an embodiment of the present invention;
FIG. 2 is a top view block diagram of a noise reduction volute of an embodiment of the present invention;
fig. 3 is an enlarged schematic view of the structure at Q of fig. 2.
The reference numerals are expressed as:
1. an inner cavity; 2. centrifugal fan blades; 3. a front groove; 4. a side groove; 5. a volute tongue; 6. a first side; 7. a second side; 8. a third side; 9. a fourth side; 10. a fifth side; 11. a sixth side; 12. u-shaped groove.
Detailed Description
Referring to fig. 1 to 3 in combination, according to an embodiment of the present invention, a noise reduction volute includes an inner cavity 1 for mounting a centrifugal fan blade 2, and a noise reduction groove communicating with the inner cavity 1 is provided on a peripheral side wall of the inner cavity 1.
Through set up the recess of making an uproar that falls on the lateral wall of the inboard cavity 1 of installation centrifugal fan blade, can reform transform spiral case shape through the recess of making an uproar for spiral case shape and retroverted centrifugal fan blade have better matchability, improve the air flow characteristic of retroverted centrifugal fan blade in the spiral case, eliminate pneumatic noise excitation source, reduce the noise of retroverted centrifugal fan blade.
Preferably, the noise reduction groove comprises a front groove 3 arranged on the side wall of the inner cavity, which is positioned on the front side of the centrifugal fan blade 2; and/or the noise reduction grooves comprise side grooves 4 arranged on the side walls of the inner cavity, which are positioned on the side surfaces of the centrifugal fan blades 2.
The noise reduction volute comprises a volute tongue 5, and the side groove 4 is arranged on the volute tongue 5, so that the shape of the volute tongue 5 is improved, and the volute tongue 5 and the centrifugal fan blade 2 can form better air flow performance.
In this embodiment, the noise reduction groove includes the front groove 3 and the side groove 4 simultaneously, so that the volute tongue structure and the air flow characteristic of the centrifugal fan blade 2 can be improved more effectively, the working noise of the centrifugal fan is reduced effectively, and the noise quality is improved.
Preferably, the side surface of the volute tongue 5 facing the centrifugal fan blade 2 is parallel to the rotation axis of the centrifugal fan blade 2, so that the gas flow of the centrifugal fan blade 2 is stable and balanced in the process of matching with the volute tongue 5, the gas turbulence is not easy to generate, and the gas flow noise is reduced.
The width of the inner cavity 1 along the axial direction of the centrifugal fan blade 2 is H4, and the depth of the front groove 3 which is recessed along the axial direction of the centrifugal fan blade 2 towards the direction far away from the inner cavity 1 is H3, wherein H4/20 is less than or equal to H3 is less than or equal to 3H4/10. Preferably, h3=h4/10.
Preferably, the front groove 3 is symmetrical about the central axis of the centrifugal fan blade 2 in a plane parallel to the central axis of the centrifugal fan blade 2 and perpendicular to the front wall surface of the inner cavity 1.
The width of the opening of the front groove 3 along the direction vertical to the central axis of the centrifugal fan blade 2 is L3, the width of the bottom of the front groove 3 along the direction vertical to the central axis of the centrifugal fan blade 2 is L4, wherein L4 is less than L3, and the front groove 3 is in arc transition from the edge of the opening to the edge of the bottom.
The side grooves 4 comprise U-shaped grooves 12, the width of each U-shaped groove 12 is H1, the minimum distance between the side wall of each U-shaped groove 12 and the rear side wall of the corresponding inner cavity 1 is H2, and the width of each inner cavity 1 along the axial direction of the centrifugal fan blade 2 is H4, wherein H4/10 is more than or equal to H1 and less than or equal to 3H4/10; h4/2 is less than or equal to H2 and less than or equal to 4H4/5. Preferably, h1=h4/5, h2=2h4/3.
For the side groove 4 provided on the volute tongue 5, the side groove 4 includes a first side 6, a second side 7, a third side 8, a fourth side 9, a fifth side 10, and a sixth side 11 that are connected in this order in a direction from the rear side wall of the inner side cavity 1 toward the front side wall of the inner side cavity 1, wherein the first side 6 is connected to the side wall of the inner side cavity 1, the sixth side 11 is connected to the front side wall of the inner side cavity 1, the third side 8, the fourth side 9, and the fifth side 10 form a U-shaped groove 12 that opens toward the inner side cavity 1, and the first side 6 and the second side 7 form a protrusion that protrudes toward the inner side cavity 1.
The included angle between the first side edge 6 and the inner side wall of the inner side cavity 1 connected with the first side edge 6 is alpha 1 = 80-90 degrees; the included angle between the first side edge 6 and the second side edge 7 is alpha 2 = 100-110 degrees; the included angle between the second side edge 7 and the third side edge 8 is alpha 3 = 120-130 degrees; the angle α4=90° between the third side edge 8 and the fourth side edge 9; the angle between the fourth side edge 9 and the fifth side edge 10 is α5=120° to 130 °. Through the structural design, the low-frequency noise peak value can be obviously reduced, and the occurrence of air duct howling is avoided.
Preferably, the adjacent side edges are in arc transition connection.
According to the embodiment of the invention, the backward tilting centrifugal fan comprises the backward tilting centrifugal fan blade and the noise reduction volute, and the centrifugal fan blade 2 is arranged in the inner cavity 1 of the noise reduction volute.
When the noise reduction volute comprises the volute tongue 5, the minimum gap between the centrifugal fan blade 2 and the volute tongue 5 is 10-15 cm.
When the opening width of the front groove 3 along the direction perpendicular to the central axis of the centrifugal fan blade 2 is L3, the diameter of the centrifugal fan blade 2 is D, and L3 is more than or equal to 0.4D and less than or equal to 0.6D. Preferably, l3=0.5d.
When the side groove 4 comprises the U-shaped groove 12, the distance between the bottom wall of the U-shaped groove 12 and the central axis of the centrifugal fan blade 2 is L1, the distance between the top point of the opening of the U-shaped groove 12 and the central axis of the centrifugal fan blade 2 is L2, the diameter of the centrifugal fan blade 2 is D, L1 is more than or equal to 0.38D and less than or equal to 0.42D, and L2 is more than or equal to 0.36D and less than or equal to 0.40D. Preferably, l1=0.4d, l2=0.38d. Through setting up the structure size relation of each part of spiral case of making an uproar, can further optimize the spiral case structure of making an uproar, further reduce low frequency noise peak value, avoid appearing wind channel whistle and call.
After the volute structure is adopted, the total noise value is reduced by 3.4 dB relative to the original volute under the condition that other sizes of the volute are unchanged, and the peak value is directly reduced by 12.4 dB, so that the noise quality is greatly improved, the noise experience and the comfort are improved in opposite directions under the influence of adverse factors such as development of a small shell and increase of the rotating speed of a developed machine type, the good combination of miniaturization and comfort of an air conditioner is realized, and the use experience of a user is effectively improved.
According to an embodiment of the present invention, an air conditioner includes a backward inclined centrifugal fan, which is the backward inclined centrifugal fan described above.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (12)
1. The noise reduction volute is characterized by comprising an inner cavity (1) for installing a centrifugal fan blade (2), wherein a noise reduction groove communicated with the inner cavity (1) is formed in the side wall of the periphery of the inner cavity (1);
the noise reduction groove comprises a front groove (3) arranged on the side wall of the inner cavity (1) and positioned on the front side of the centrifugal fan blade (2); the noise reduction groove comprises a side groove (4) arranged on the side wall of the inner side cavity (1) and positioned on the side surface of the centrifugal fan blade (2);
the noise reduction volute comprises a volute tongue (5), and the side groove (4) is arranged on the volute tongue (5);
the side groove (4) comprises a first side (6), a second side (7), a third side (8), a fourth side (9), a fifth side (10) and a sixth side (11) which are sequentially connected along the direction from the rear side wall of the inner side cavity (1) to the front side wall of the inner side cavity (1), wherein the first side (6) is connected to the side wall of the inner side cavity (1), the sixth side (11) is connected to the front side wall of the inner side cavity (1), the third side (8), the fourth side (9) and the fifth side (10) form a U-shaped groove (12) which is opened towards the inner side cavity (1), and the first side (6) and the second side (7) form a bulge which is protruded towards the inner side cavity (1);
the included angle between the first side edge (6) and the inner side wall of the inner side cavity (1) connected with the first side edge (6) is alpha 1 = 80-90 degrees; the included angle between the first side edge (6) and the second side edge (7) is alpha 2 = 100-110 degrees; the included angle between the second side edge (7) and the third side edge (8) is alpha 3 = 120-130 degrees; -an angle α4=90° between the third side edge (8) and the fourth side edge (9); the included angle between the fourth side edge (9) and the fifth side edge (10) is alpha 5 = 120-130 degrees.
2. The noise-reducing volute of claim 1, wherein the side of the volute tongue (5) facing the centrifugal fan blade (2) is parallel to the rotational axis of the centrifugal fan blade (2).
3. The noise reduction volute of claim 1, wherein the width of the inner cavity (1) along the axial direction of the centrifugal fan blade (2) is H4, and the depth of the front groove (3) recessed along the axial direction of the centrifugal fan blade (2) towards the direction away from the inner cavity (1) is H3, wherein H4/20 is equal to or less than H3 is equal to or less than 3H4/10.
4. The noise reducing volute of claim 1, wherein the front recess (3) is symmetrical about the central axis of the centrifugal fan blade (2) in a plane parallel to the central axis of the centrifugal fan blade (2) and perpendicular to the front wall surface of the inner cavity (1).
5. The noise reduction volute of claim 4, wherein the front groove (3) has an opening width L3 along a direction perpendicular to the central axis of the centrifugal fan blade (2), the front groove (3) has a bottom width L4 along a direction perpendicular to the central axis of the centrifugal fan blade (2), wherein L4 < L3, and the front groove (3) has a circular arc transition from an opening edge to a bottom edge.
6. The noise reduction volute according to claim 1, characterized in that the side recess (4) comprises a U-shaped groove (12), the width of the U-shaped groove (12) is H1, the minimum distance between the side wall of the U-shaped groove (12) and the rear side wall of the inner cavity (1) is H2, the width of the inner cavity (1) along the axial direction of the centrifugal fan blade (2) is H4, wherein H4/10 is equal to or less than H1 is equal to or less than 3H4/10; h4/2 is less than or equal to H2 and less than or equal to 4H4/5.
7. The noise reduction volute of claim 1, wherein each adjacent side edge is in a circular arc transition connection.
8. A retroverted centrifugal fan, characterized by comprising retroverted centrifugal fan blades, and further comprising a noise reduction volute according to any one of claims 1 to 7, wherein the centrifugal fan blades (2) are arranged in an inner cavity (1) of the noise reduction volute.
9. The retroverted centrifugal fan according to claim 8, wherein when the noise reducing volute comprises a volute tongue (5), the minimum clearance between the centrifugal fan blade (2) and the volute tongue (5) is 10 to 15cm.
10. The backward inclined centrifugal fan according to claim 8, wherein when the opening width of the front groove (3) along the direction perpendicular to the central axis of the centrifugal fan blade (2) is L3, the diameter of the centrifugal fan blade (2) is D,0.4D is equal to or less than L3 is equal to or less than 0.6D.
11. The backward tilting centrifugal fan according to claim 8, wherein when the side groove (4) comprises a U-shaped groove (12), a distance between a bottom wall of the U-shaped groove (12) and a central axis of the centrifugal fan blade (2) is L1, a distance between an opening vertex of the U-shaped groove (12) and the central axis of the centrifugal fan blade (2) is L2, a diameter of the centrifugal fan blade (2) is D, L1 is 0.38D is 0.42D, L2 is 0.36D is 0.40D.
12. An air conditioner comprising a retroverted centrifugal fan, wherein the retroverted centrifugal fan is the retroverted centrifugal fan according to any one of claims 8 to 11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095275.6A CN108457903B (en) | 2018-01-31 | 2018-01-31 | Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner |
| PCT/CN2018/104434 WO2019148840A1 (en) | 2018-01-31 | 2018-09-06 | Noise reduction volute, backward-tilting centrifugal fan, and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095275.6A CN108457903B (en) | 2018-01-31 | 2018-01-31 | Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108457903A CN108457903A (en) | 2018-08-28 |
| CN108457903B true CN108457903B (en) | 2023-08-29 |
Family
ID=63239120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810095275.6A Active CN108457903B (en) | 2018-01-31 | 2018-01-31 | Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108457903B (en) |
| WO (1) | WO2019148840A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457903B (en) * | 2018-01-31 | 2023-08-29 | 珠海格力电器股份有限公司 | Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner |
| CN108954754B (en) * | 2018-10-24 | 2023-09-15 | 奥克斯空调股份有限公司 | Air duct structure and air conditioner |
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|---|---|---|---|---|
| JPH05280497A (en) * | 1992-03-30 | 1993-10-26 | Nippondenso Co Ltd | Multiblade blower |
| JPH08312592A (en) * | 1995-05-19 | 1996-11-26 | Akaishi Kinzoku Kogyo Kk | Opening part structure of casing for blower |
| CN102042264A (en) * | 2009-10-10 | 2011-05-04 | 珠海格力电器股份有限公司 | Volute tongue with bionic structure and volute using same |
| CN203023127U (en) * | 2012-12-07 | 2013-06-26 | Tcl空调器(中山)有限公司 | Floor air conditioner and volute thereof |
| CN204084796U (en) * | 2014-07-05 | 2015-01-07 | 慈溪欧能电器有限公司 | A kind of air inlet shell structure |
| CN208185061U (en) * | 2018-01-31 | 2018-12-04 | 珠海格力电器股份有限公司 | Noise reduction volute, backward tilting type centrifugal fan and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61192900A (en) * | 1985-02-20 | 1986-08-27 | Matsushita Refrig Co | Centrifugal blower |
| CN201513386U (en) * | 2009-10-10 | 2010-06-23 | 珠海格力电器股份有限公司 | Volute tongue with bionic structure and volute using same |
| CN204553347U (en) * | 2015-03-17 | 2015-08-12 | 广东美的制冷设备有限公司 | The spiral case of centrifugal blower, centrifugal blower and air conditioner |
| CN108457903B (en) * | 2018-01-31 | 2023-08-29 | 珠海格力电器股份有限公司 | Noise reduction spiral case, backward tilting type centrifugal fan and air conditioner |
-
2018
- 2018-01-31 CN CN201810095275.6A patent/CN108457903B/en active Active
- 2018-09-06 WO PCT/CN2018/104434 patent/WO2019148840A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05280497A (en) * | 1992-03-30 | 1993-10-26 | Nippondenso Co Ltd | Multiblade blower |
| JPH08312592A (en) * | 1995-05-19 | 1996-11-26 | Akaishi Kinzoku Kogyo Kk | Opening part structure of casing for blower |
| CN102042264A (en) * | 2009-10-10 | 2011-05-04 | 珠海格力电器股份有限公司 | Volute tongue with bionic structure and volute using same |
| CN203023127U (en) * | 2012-12-07 | 2013-06-26 | Tcl空调器(中山)有限公司 | Floor air conditioner and volute thereof |
| CN204084796U (en) * | 2014-07-05 | 2015-01-07 | 慈溪欧能电器有限公司 | A kind of air inlet shell structure |
| CN208185061U (en) * | 2018-01-31 | 2018-12-04 | 珠海格力电器股份有限公司 | Noise reduction volute, backward tilting type centrifugal fan and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019148840A1 (en) | 2019-08-08 |
| CN108457903A (en) | 2018-08-28 |
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