CN108457906B - Volute tongue, cross-flow fan and air conditioner - Google Patents
Volute tongue, cross-flow fan and air conditioner Download PDFInfo
- Publication number
- CN108457906B CN108457906B CN201810547447.9A CN201810547447A CN108457906B CN 108457906 B CN108457906 B CN 108457906B CN 201810547447 A CN201810547447 A CN 201810547447A CN 108457906 B CN108457906 B CN 108457906B
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- China
- Prior art keywords
- tongue
- drainage
- impeller
- channel
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
Classifications
-
- 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
- F04D29/422—Discharge tongues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
-
- 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
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 volute tongue, a cross-flow fan and an air conditioner. The volute tongue comprises a volute tongue body, wherein the volute tongue body is provided with a drainage wall, a tongue inner flow surface and drainage channels, the drainage channels extend from the drainage wall to the tongue inner flow surface, so that the airflow part at the drainage wall is led to the tongue inner flow surface, at least two drainage channels are arranged, and the at least two drainage channels are sequentially arranged along the radial direction of the impeller. The volute tongue, the cross-flow fan and the air conditioner are particularly suitable for machine types with different rotating speeds, have a wider wind speed application range and effectively reduce noise of the cross-flow fan.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a volute tongue, a cross-flow fan and an air conditioner.
Background
In the past, volute tongue noise is an important problem affecting through-flow fan noise, and can utilize a single air supplementing channel to regulate tongue air flow, but for different models, the rotating speed variation range is wider, if only a single air supplementing channel is adopted, all rotating speed ranges cannot be considered, the specific low rotating speed fan capacity can be influenced to a certain extent, and the high rotating speed noise can not be effectively inhibited when the low rotating speed is considered, so that an air supplementing structure with multiple air supplementing channels capable of realizing air flow regulation in a wider range is required.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the volute tongue, the cross-flow fan and the air conditioner, which are particularly suitable for machine types with different rotating speeds, have a wider wind speed application range and effectively reduce the noise of the cross-flow fan.
In order to solve the above problems, the present invention provides a volute tongue, which includes a volute tongue body, wherein the volute tongue body has a drainage wall, a tongue inner flow surface, and drainage channels, the drainage channels extend from the drainage wall to the tongue inner flow surface so as to guide an airflow portion at the drainage wall to the tongue inner flow surface, and at least two drainage channels are sequentially arranged along a radial direction of an impeller.
Preferably, the number of the drainage channels is not more than one along the radial direction of the impeller.
Preferably, a plane perpendicular to the axis of the impeller 2 is a first plane, the drainage wall 11 and the intra-lingual flow surface 12 are connected through the airflow splitting surface 17, a projection of the airflow splitting surface 17 on the first plane forms a first circular arc, a first line segment passes through the center of the first circular arc, the first line segment is perpendicular to the drainage wall 11, a projection of the drainage wall 11 on the first plane forms a second line segment, the first line segment and the second line segment intersect at a first point, the drainage wall 11 has a first length L from the first point along the air outlet direction, the drainage wall 11 in the range of 0-60% L from the first point is a first interval, the drainage wall 11 is provided with an inlet 131 of the drainage channel 13, and the inlet 131 is arranged on the first interval.
Preferably, the first section includes a second section, the drainage wall 11 ranging from 0 to 40% l from the first point is the second section, and the inlet 131 is disposed on the second section.
Preferably, the drainage channel is an arc-shaped channel.
Preferably, the drainage channel 13 has a first tangent at the inlet 131, which forms an air flow deflection angle a with the drainage wall on the side close to the impeller, 0 ° < a < 90 °.
Preferably 0 DEG < A < 50 deg.
Preferably, the number of the drainage channels 13 is at least three, and the at least three drainage channels 13 are staggered on the drainage wall 11 along the axial direction of the impeller 2.
Preferably, the number of the drainage channels 13 is at least three, and the at least three drainage channels 13 are staggered on the drainage wall 11 along the air outlet direction.
Preferably, the volute tongue body at least comprises a first tongue body, a second tongue body and a third tongue body, the first tongue body, the second tongue body and the third tongue body are sequentially arranged in the radial direction of the impeller, the drainage channel at least comprises a first channel and a second channel, the first channel is formed between the first tongue body and the second tongue body, and the second channel is formed between the second tongue body and the third tongue body.
Preferably, the first tongue is movable relative to the second tongue in a radial direction of the impeller to open or close the first channel, and/or the second tongue is movable relative to the third tongue in a radial direction of the impeller to open or close the second channel.
The invention also provides a cross-flow fan, which comprises the volute tongue.
The invention also provides an air conditioner comprising the cross-flow fan.
According to the volute tongue, the cross-flow fan and the air conditioner provided by the invention, at least two drainage channels are arranged in sequence along the radial direction of the impeller, so that the airflow output by the impeller can be guided to the flow surface in the tongue from the inlet of the at least two drainage channels, and finally the circumferential rotation speed of the impeller is reduced at the small tongue interval between the impeller and the flow surface in the tongue, thereby reducing the noise of the cross-flow fan and the air conditioner applying the cross-flow fan, and more importantly, the drainage channels are more beneficial to adjusting the circumferential rotation speed of the impeller under the condition that the range of the wind speed (which is positively related to the rotation speed of the impeller) is wider because the airflow is led into the small tongue interval at different positions of the drainage wall by the drainage channels.
Drawings
FIG. 1 is a schematic view of a volute tongue according to an embodiment of the present invention;
FIG. 2 is a schematic view of a portion of the drainage wall of the volute tongue along the direction B of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of a drainage wall of a volute tongue according to another embodiment of the invention along the direction B in FIG. 1;
FIG. 4 is a schematic view showing a partial structure of a drainage wall of a volute tongue according to still another embodiment of the present invention along the direction B in FIG. 1;
FIG. 5 is a schematic view showing a partial structure of a drainage wall of a volute tongue according to still another embodiment of the present invention along the direction B in FIG. 1;
FIG. 6 is a graph showing the relative change of the wind speed of the air outlet of the volute tongue on the surface of the drainage wall and the length of the drainage wall according to the embodiment of the invention;
FIG. 7 is a graph showing the velocity of the air outlet of the drainage channel and the length of the drainage channel of the volute tongue according to the embodiment of the present invention.
The reference numerals are expressed as:
1. a volute tongue body; 11. a drainage wall; 12. a tongue inner flow surface; 13. a drainage channel; 131. an inlet; 133. a first channel; 134. a second channel; 14. a first tongue; 15. a second tongue; 16. a third tongue; 17. an airflow diversion surface; 2. an impeller; 3. the volute tongue is small in distance.
Detailed Description
Referring to fig. 1 to 7 in combination, according to an embodiment of the present invention, there is provided a volute tongue including a volute tongue body 1, the volute tongue body 1 having a drainage wall 11, an intra-lingual flow surface 12, and a drainage channel 13, the drainage channel 13 extending from the drainage wall 11 toward the intra-lingual flow surface 12 to guide an airflow portion at the drainage wall 11 toward the intra-lingual flow surface 12, the drainage channel 13 being at least two, and the at least two drainage channels 13 being sequentially arranged in a radial direction of an impeller 2. In this technical solution, the number of the drainage channels 13 is at least two, and at least two of the drainage channels 13 are sequentially arranged along the radial direction of the impeller 2, so that the air flow output by the impeller 2 can be guided to the tongue inner flow surface 12 from the inlet 131 of at least two of the drainage channels 13, and finally the circumferential rotation speed of the impeller 2 is reduced at the tongue small space 3 between the impeller 2 and the tongue inner flow surface 12, thereby reducing the noise of the cross-flow fan and even the air conditioner using the cross-flow fan, and more importantly, because the drainage channels 13 introduce the air flow into the tongue small space 3 at different positions of the drainage wall 11, the drainage channels 13 are more beneficial to adjusting the circumferential rotation speed of the impeller 2 under the condition that the wind speed (which is just related to the rotation speed of the impeller 2) range is wider.
Of course, in order to further reduce noise, the number of the drainage channels 13 may be greater than 4 to 6 along the radial direction of the impeller 2, but when the number of the drainage channels 13 is too large, it is easy to cause the volute tongue body 1 between two adjacent drainage channels 13 to be too thin, and the rigidity and strength of the volute tongue body 1 will be reduced, so that preferably, the number of the drainage channels 13 does not exceed 5 along the radial direction of the impeller 2.
As is evident from fig. 6 (the surface wind speed unit is m/s, the flow guiding wall is mm along the length of the flow guiding wall in fig. 6), the surface wind speed of the air outlet flow of the impeller 2 on the flow guiding wall 11 gradually decreases as the length of the flow guiding wall 11 increases, therefore, in order to increase the influence degree of the air flow backflow on the circumferential rotation speed of the impeller 2, the opening 131 of the flow guiding channel 13 should be arranged in the area of the flow guiding wall 11 near the impeller 2 side, specifically, the plane perpendicular to the axis of the impeller 2 is a first plane, the flow guiding wall 11 and the tongue inner flow surface 12 are connected through the air flow dividing surface 17, the projection of the air flow dividing surface 17 on the first plane forms a first circular arc, the center of the first circular arc is provided with a first line segment, the projection of the first line segment perpendicular to the flow guiding wall 11 on the first plane forms a second line segment, the first line segment intersects with the second line segment at a first point, the flow guiding wall 11 has a first length L along the air outlet direction from the first point, the area is 0-60% of the flow guiding wall 11 has the first point, and the flow guiding channel 131 is arranged on the first point 11 at the first point 11. Further, the first section includes a second section, the drainage wall 11 ranging from 0 to 40% l from the first point is the second section, and the inlet 131 is disposed on the second section.
As is evident from fig. 7 (the outflow wind speed is m/s in fig. 7, the length of the drainage channel is mm), the outflow wind speed of the air flow will gradually decrease as the length of the drainage channel 13 increases, the root cause of this is that the along-path resistance of the air flow will increase as the length of the drainage channel 13 increases, so that the outflow wind speed of the air flow will gradually decrease in association with the same, and in order to reduce the along-path resistance of the drainage channel 13 as much as possible, preferably, the drainage channel 13 is an arc-shaped channel, where the arc-shaped channel may be a smooth connection curve of a plurality of arc-shaped lines with different curvature radii, and the smooth curve should curve towards one side of the impeller 2, and further, it is better to use an arc-shaped line with a single curvature radius, at this time, the along-path resistance of the drainage channel 13 will further decrease, which will certainly further increase the influence of the air flow in the drainage channel 13 on the air flow at the small distance 3 of the volute tongue, and further reduce the noise of the through-flow fan during operation.
In order to fully utilize the wind speed of the air flowing out of the impeller 2, it is preferable that the flow guiding channel 13 has a first tangent line at the inlet 131, and the first tangent line forms an air flow deflection angle a with the flow guiding wall 11 near one side of the impeller 2, wherein 0 ° < a < 90 °, more specifically 0 ° < a < 50 °, more specifically, the closer to 0 °, the higher the wind speed of the air flowing out of the impeller 2 at the inlet 131, which naturally further reduces the circumferential rotation speed of the impeller 2, and certainly is more beneficial to reduce the noise of the cross-flow fan and even the air conditioner.
The arrangement mode of the at least two drainage channels 13 on the drainage wall 11 may be multiple, for example, the at least three drainage channels 13 are staggered on the drainage wall 11 along the axial direction of the impeller 2, and/or the at least three drainage channels 13 are staggered on the drainage wall 11 along the air outlet direction, and further, the distances between two adjacent drainage channels 13 may be equal or unequal, which is beneficial to necessary adjustment of the spacing of the drainage channels 13 according to different fan performances in the production and manufacturing process, has stronger pertinence, and is more beneficial to reducing the noise of the through-flow fan.
For the drainage channel 13, one forming mode may be a mode of directly arranging a channel on the volute tongue body 1, the position of the mode is relatively fixed, and another mode may be that the volute tongue body 1 at least includes a first tongue 14, a second tongue 15 and a third tongue 16, the first tongue 14, the second tongue 15 and the third tongue 16 are sequentially arranged in the radial direction of the impeller 2, the drainage channel 13 at least includes a first channel 133 and a second channel 134, the first channel 133 is formed between the first tongue 14 and the second tongue 15, and the second channel 134 is formed between the second tongue 15 and the third tongue 16.
In order to adjust the closing and opening of the drainage channel 13 in real time during the operation of the through-flow fan, preferably, the first tongue 14 and the second tongue 15 can move radially relative to the second tongue 15 along the impeller 2 to open or close the first channel 133, and/or the second tongue 15 can move radially relative to the third tongue 16 along the impeller 2 to open or close the second channel 134, specifically, the first tongue 14, the second tongue 15 and the third tongue 16 can all be disposed on a common base, and sliding connection is adopted between the first tongue 14, the second tongue 15, the third tongue 16 and the base, and relative movement is generated between the first tongue 14, the second tongue 15 and the third tongue 16 through a driving device such as a motor, for example, and further, the first tongue 14, the second tongue 15 and the third tongue 16 are embedded into one body, for example, the first tongue 14 is embedded into the second tongue 15, the second tongue 14 is embedded into the second tongue 15, and the second tongue 16 is driven by the driving device such as a motor, and the second tongue 16 is driven by the second tongue 16 and the second tongue 16 is driven by the driving device such as to move the first tongue 14, the second tongue 16 and the third tongue 16, the second tongue 16 is driven by the driving device, and the second tongue 16 is easy to open and close according to the first tongue 16 and the second tongue 16.
According to the embodiment of the invention, the through-flow fan comprises the volute tongue, and the noise is effectively reduced during operation due to the adoption of the volute tongue.
According to the embodiment of the invention, the air conditioner comprises the cross flow fan, and the noise is effectively reduced during operation due to the adoption of the cross flow fan.
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 (11)
1. The volute tongue is characterized by comprising a volute tongue body (1), wherein the volute tongue body (1) is provided with a drainage wall (11), a tongue inner flow surface (12) and a drainage channel (13), the drainage channel (13) extends from the drainage wall (11) to the tongue inner flow surface (12) so as to guide airflow at the drainage wall (11) to the tongue inner flow surface (12), at least two drainage channels (13) are arranged in sequence along the radial direction of an impeller (2), the tongue inner flow surface (12) is a wall surface of the volute tongue body (1) opposite to the impeller (2), the drainage wall (11) is a wall surface of the volute tongue body (1) in contact with air outlet flow of the impeller (2), and the tongue inner flow surface (12) is positioned between the impeller (2) and the drainage wall (11); the volute tongue body (1) at least comprises a first tongue body (14), a second tongue body (15) and a third tongue body (16), wherein the first tongue body (14), the second tongue body (15) and the third tongue body (16) are sequentially arranged on the radial direction of the impeller (2), the drainage channel (13) at least comprises a first channel (133) and a second channel (134), the first channel (133) is formed between the first tongue body (14) and the second tongue body (15), and the second channel (134) is formed between the second tongue body (15) and the third tongue body (16); the first tongue (14) can move radially relative to the second tongue (15) along the impeller (2) to open or close the first channel (133), and/or the second tongue (15) can move radially relative to the third tongue (16) along the impeller (2) to open or close the second channel (134); the plane perpendicular to the axis of the impeller (2) is a first plane, the drainage wall (11) and the tongue inner flow surface (12) are connected through the airflow diversion surface (17), and the projection of the airflow diversion surface (17) on the first plane forms a first circular arc.
2. A volute tongue according to claim 1, wherein the number of drainage channels (13) is not more than 5 in the radial direction of the impeller (2).
3. A volute tongue according to claim 1, wherein a first line segment is provided through the center of the first circular arc, the first line segment is perpendicular to the drainage wall (11), the projection of the drainage wall (11) on the first plane forms a second line segment, the first line segment intersects with the second line segment at a first point, the drainage wall (11) has a first length L from the first point in the air outlet direction, the drainage wall (11) in the range of 0-60% L from the first point is a first section, the drainage wall (11) has an inlet (131) of the drainage channel (13) thereon, and the inlet (131) is disposed on the first section.
4. A volute tongue according to claim 3, wherein the first section comprises a second section, the drainage wall (11) in the range of 0-40% l from the first point being the second section, the inlet (131) being arranged on the second section.
5. A volute tongue according to claim 3, wherein the drainage channel (13) is an arcuate channel.
6. A volute tongue according to claim 4, wherein the drainage channel (13) has a first tangent at the inlet (131) that forms an air flow deflection angle a with the drainage wall (11) on the side close to the impeller (2), 0 ° < a < 90 °.
7. A volute tongue according to claim 6, wherein 0 ° < a < 50 °.
8. A volute tongue according to any one of claims 1 to 7, wherein the number of drainage channels (13) is at least three, the at least three drainage channels (13) being staggered on the drainage wall (11) along the axial direction of the impeller (2).
9. A volute tongue according to any one of claims 1 to 7, wherein the number of drainage channels (13) is at least three, the at least three drainage channels (13) being staggered on the drainage wall (11) in the direction of the air outlet.
10. A cross flow fan comprising a volute tongue, wherein the volute tongue is a volute tongue according to any one of claims 1 to 9.
11. An air conditioner comprising a cross flow fan, wherein the cross flow fan is the cross flow fan of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810547447.9A CN108457906B (en) | 2018-05-31 | 2018-05-31 | Volute tongue, cross-flow fan and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810547447.9A CN108457906B (en) | 2018-05-31 | 2018-05-31 | Volute tongue, cross-flow fan and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108457906A CN108457906A (en) | 2018-08-28 |
| CN108457906B true CN108457906B (en) | 2023-11-24 |
Family
ID=63215804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810547447.9A Active CN108457906B (en) | 2018-05-31 | 2018-05-31 | Volute tongue, cross-flow fan and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108457906B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882447B (en) * | 2019-02-27 | 2024-05-10 | 华帝股份有限公司 | Fan and range hood with same |
| CN114962335A (en) * | 2021-11-30 | 2022-08-30 | Tcl空调器(中山)有限公司 | Volute structure, air duct component and air conditioner |
| CN114440316B (en) * | 2022-01-30 | 2024-02-27 | 广东美的暖通设备有限公司 | Air duct assembly and air conditioning equipment with same |
| CN114636197B (en) * | 2022-03-31 | 2023-09-08 | 广东美的白色家电技术创新中心有限公司 | Cross-flow fan and air conditioner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191214668A (en) * | 1911-06-23 | 1912-11-14 | Aegidius Elling | Improvements in Turbo-pumps or Fans. |
| GB876611A (en) * | 1956-12-07 | 1961-09-06 | Firth Cleveland Ltd | Improvements in or relating to machines for inducing flow of fluid for example pumpsand blowers |
| US3522994A (en) * | 1967-05-18 | 1970-08-04 | Kurt Zenkner | Vacuum cleaner |
| US5286162A (en) * | 1993-01-04 | 1994-02-15 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method of reducing hydraulic instability |
| FR2906581A3 (en) * | 2006-09-29 | 2008-04-04 | Renault Sas | Pump i.e. rotating centrifugal pump, body for engine cooling system, has volute tongue traversed by channel connecting high and low pressure field zones that are located in diversion part and in collector respectively |
| CN105626581A (en) * | 2016-02-22 | 2016-06-01 | 清华大学 | Stress application centrifugal pump with pressurization hole |
| CN208252438U (en) * | 2018-05-31 | 2018-12-18 | 珠海格力电器股份有限公司 | Volute tongue, cross flow fan, air conditioner |
-
2018
- 2018-05-31 CN CN201810547447.9A patent/CN108457906B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191214668A (en) * | 1911-06-23 | 1912-11-14 | Aegidius Elling | Improvements in Turbo-pumps or Fans. |
| GB876611A (en) * | 1956-12-07 | 1961-09-06 | Firth Cleveland Ltd | Improvements in or relating to machines for inducing flow of fluid for example pumpsand blowers |
| US3522994A (en) * | 1967-05-18 | 1970-08-04 | Kurt Zenkner | Vacuum cleaner |
| US5286162A (en) * | 1993-01-04 | 1994-02-15 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method of reducing hydraulic instability |
| FR2906581A3 (en) * | 2006-09-29 | 2008-04-04 | Renault Sas | Pump i.e. rotating centrifugal pump, body for engine cooling system, has volute tongue traversed by channel connecting high and low pressure field zones that are located in diversion part and in collector respectively |
| CN105626581A (en) * | 2016-02-22 | 2016-06-01 | 清华大学 | Stress application centrifugal pump with pressurization hole |
| CN208252438U (en) * | 2018-05-31 | 2018-12-18 | 珠海格力电器股份有限公司 | Volute tongue, cross flow fan, air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108457906A (en) | 2018-08-28 |
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