CN108240354B - Volute tongue and centrifugal fan provided with same - Google Patents
Volute tongue and centrifugal fan provided with same Download PDFInfo
- Publication number
- CN108240354B CN108240354B CN201711451180.5A CN201711451180A CN108240354B CN 108240354 B CN108240354 B CN 108240354B CN 201711451180 A CN201711451180 A CN 201711451180A CN 108240354 B CN108240354 B CN 108240354B
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- China
- Prior art keywords
- volute tongue
- variable
- cylinder
- volute
- shaft
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Links
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000779 smoke Substances 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
- F04D29/422—Discharge tongues
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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
- F04D29/4233—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
- F04D29/66—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
- F04D29/663—Sound attenuation
Abstract
The invention discloses a volute tongue, which is characterized in that: the flexible volute tongue wall comprises a support frame and a flexible volute tongue wall arranged on the support frame to form the outline of the volute tongue, wherein the support frame comprises an upper support body, a lower support body and a variable R cylinder arranged at the root of the volute tongue, the variable R cylinder is arranged at the head of the volute tongue, the upper support body, the lower support body and the variable R cylinder are distributed in a triangular mode, and the flexible volute tongue wall further comprises a driving mechanism used for driving the variable R cylinder to rotate. The invention also discloses a centrifugal fan provided with the volute tongue. The invention is characterized in that the advantages are that: the flexible volute tongue wall of the volute tongue is supported on the upper supporting body, the lower supporting body and the variable R cylinder which are distributed in a triangular mode, the upper supporting body and the lower supporting body are arranged at the root of the volute tongue, the variable R cylinder is arranged at the volute tongue part, the variable R cylinder is driven by the driving mechanism to rotate, and then the variable R adjustment of the volute tongue can be realized, so that the gap between the volute tongue and the impeller is changed, the performance of a fan is improved or the noise is reduced, and the volute tongue can be better adapted to various actual working conditions.
Description
Technical Field
The present invention relates to a centrifugal fan and, in particular to a volute tongue and a centrifugal fan provided with the volute tongue.
Background
The multi-wing centrifugal fan has the advantages of compact structure, high pressure coefficient, large flow coefficient, low noise and the like, and is widely applied to a range hood product. The centrifugal fan is provided with a volute tongue near the outlet of the volute, and the centrifugal fan has the function of preventing part of gas from circularly flowing in the volute. The impact of the air flow at the impeller outlet on the volute tongue is strong, the air flow near the volute tongue is complex, and the influence on the performance of the fan is large. Research shows that when the radius of the front end of the volute tongue is properly reduced, the gap between the volute tongue and the impeller is reduced, the air quantity and the static pressure are improved, and the noise is increased. When the radius of the front end of the volute tongue is properly increased, the gap between the volute tongue and the impeller is increased, the rotation noise and the vortex noise of the fan are reduced, and the air quantity and the static pressure are reduced.
Therefore, the centrifugal fan generally compromises the performance and noise to obtain a proper fixed value, but the fixed value is often effective for one working condition, and for other working condition points of the centrifugal fan, the performance of the centrifugal fan is greatly reduced due to the change of an impeller speed triangle and the influence of outlet environment on backflow. Therefore, a variable R volute tongue is designed, even if the radius R of the front end of the volute tongue gradually changes from the front cover to the rear cover of the volute, the fillet of the volute tongue is changed in a simple axial variable R mode, and meanwhile, the gap between the volute tongue and an impeller is changed to balance the performance of the fan, but the volute tongue still cannot be adaptively adjusted according to the actual working condition of the centrifugal fan, and needs to be further improved.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a volute tongue capable of realizing R-changing adjustment, aiming at the above state of the art.
The second technical problem to be solved by the invention is to provide a centrifugal fan capable of adjusting the gap between the volute tongue and the impeller according to different working conditions of the centrifugal fan aiming at the current state of the art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the volute tongue is characterized in that: the flexible volute tongue wall comprises a support frame and a flexible volute tongue wall arranged on the support frame to form the outline of the volute tongue, wherein the support frame comprises an upper support body, a lower support body and a variable R cylinder arranged at the root of the volute tongue, the variable R cylinder is arranged at the head of the volute tongue, the upper support body, the lower support body and the variable R cylinder are distributed in a triangular mode, and the flexible volute tongue wall further comprises a driving mechanism used for driving the variable R cylinder to rotate.
Preferably, the cross section of the variable R cylinder has a small head end and a large head end.
In order to smoothly realize the R-changing adjustment of the volute tongue, the outer circumferential surface of the R-changing cylinder is a smooth surface.
The driving mechanism can have various structures, preferably, the driving mechanism is a motor, and the R-changing cylinder is mounted on an output shaft of the motor.
In order to enable the flexible volute tongue wall arranged on the support frame to form the volute tongue outer contour, the upper support body is arranged above the front of the lower support body, and the R-changing cylinder is arranged below the front of the lower support body.
As a preferable scheme, the upper support body is an upper support shaft, the lower support body is a lower support shaft, and the axes of the upper support shaft, the lower support shaft and the R-shaped column body are parallel to each other.
Further preferably, the flexible volute tongue wall surrounds and supports the upper support shaft, the lower support shaft and the outer portion of the variable R cylinder.
As another preferable scheme, the upper supporting body is an upper supporting strip, the lower supporting body is a lower supporting strip, the upper supporting strip and the lower supporting strip are mutually parallel and distributed along the axial direction of the R-shaped column body, and the rear ends of the flexible volute tongue walls are fixed on the upper supporting strip and the lower supporting strip.
The invention solves the second technical problem by adopting the technical proposal that: the centrifugal fan provided with the volute tongue comprises a volute casing, an impeller and the volute tongue, wherein the volute casing comprises a front cover, a rear cover and an annular wall, and is characterized in that: the upper support shaft and the lower support shaft are close to the annular wall, and two ends of the upper support shaft and the lower support shaft are respectively supported on the front cover and the rear cover.
The invention solves the second technical problem by adopting the technical proposal that: the centrifugal fan provided with the volute tongue comprises a volute casing, an impeller and the volute tongue, wherein the volute casing comprises a front cover, a rear cover and an annular wall, and is characterized in that: the upper supporting bar and the lower supporting bar are fixed on the annular wall through screws.
Compared with the prior art, the invention has the advantages that: the flexible volute tongue wall of the volute tongue is supported on the upper supporting body, the lower supporting body and the variable R cylinder which are distributed in a triangular mode, the upper supporting body and the lower supporting body are arranged at the root of the volute tongue, the variable R cylinder is arranged at the volute tongue part, the variable R cylinder is driven by the driving mechanism to rotate, and then the variable R adjustment of the volute tongue can be realized, so that the gap between the volute tongue and the impeller is changed, the performance of a fan is improved or the noise is reduced, and the volute tongue can be better adapted to various actual working conditions.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an internal structure of a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the first embodiment of the present invention in a small R operating state;
FIG. 4 is a schematic view of a structure of an embodiment of the present invention in a large R operating state
FIG. 5 is a schematic view of a fan with a volute tongue according to one embodiment of the invention;
FIG. 6 is a schematic view of the blower of FIG. 5 with a partial front cover of the volute removed;
FIG. 7 is a cross-sectional view of the blower of FIG. 5;
FIG. 8 is a schematic view of a first embodiment of the present invention with a small clearance between the volute tongue and the impeller;
FIG. 9 is a schematic view of the first embodiment of the present invention in a state where the clearance between the volute tongue and the impeller is large;
FIG. 10 is a schematic illustration of an embodiment of the present invention the second embodiment is a schematic structural diagram.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
as shown in fig. 1 to 4, the volute tongue in the present embodiment includes a variable R cylinder 1, an upper support shaft 2, a lower support shaft 3, a flexible volute tongue wall 4, and a motor 5. Wherein, upper supporting shaft 2 and lower supporting shaft 3 are located the root of volute tongue, become R cylinder 1 and locate the head of volute tongue. The upper support shaft 2 is arranged above the front of the lower support shaft 3, and the R-changing cylinder 1 is arranged below the front of the lower support shaft 3, so that the upper support shaft 2, the lower support shaft 3 and the R-changing cylinder 1 are distributed in a triangular shape and the axes of the upper support shaft, the lower support shaft and the R-changing cylinder 1 are parallel to each other.
The upper support shaft 2 forms an upper support body of the volute tongue, the lower support shaft 3 forms a lower support body of the volute tongue, the upper support shaft 2, the lower support shaft 3 and the variable R cylinder 1 jointly form a support frame, and the flexible volute tongue wall 4 surrounds and supports the outer parts of the upper support shaft 2, the lower support shaft 3 and the variable R cylinder 1 to form the outer contour of the volute tongue.
In this embodiment, the cross section of the R-changing cylinder 1 has a small end 11 and a large end 12, and the outer peripheral surface of the R-changing cylinder 1 is a smooth surface. The R-variable cylinder 1 is arranged on an output shaft of the motor 5, and the motor 5 drives the R-variable cylinder 1 when rotating, so that the R angle of the volute tongue is changed. As shown in fig. 3, when the R column 1 is rotated to the state that the small end 11 is downward, the R angle is R1, and as shown in fig. 4, when the R column 1 is rotated to the state that the large end 12 is downward, the R angle is R2, and R1< R2 is satisfied. The smaller the R angle, the higher the flow and static pressure, but the higher the noise; the larger the R angle, the lower the flow and static pressure, but the less noise.
As shown in fig. 5 to 9, the centrifugal fan includes a scroll casing 9, an impeller 8, and a scroll tongue, the scroll casing 9 includes a front cover 91, a rear cover 92, and an annular wall 93, an upper support shaft 2 and a lower support shaft 3 of the scroll tongue are close to the annular wall 93, and both ends of the upper support shaft 2 and the lower support shaft 3 are supported on the front cover 91 and the rear cover 92, respectively.
As shown in fig. 8, the motor 5 drives the variable R cylinder 1 to rotate anticlockwise, so that the gap between the volute tongue and the impeller 8 is reduced, the flow and static pressure are improved, and the smoke sucking and exhausting effect is improved; as shown in fig. 9, the motor 5 drives the R-changing cylinder 1 to rotate clockwise, so that the gap between the volute tongue and the impeller 8 is increased, and the aerodynamic noise is reduced.
When the range hood works, according to different actual working conditions, the motor 5 can be controlled by a controller (not shown in the figure) to rotate positively and negatively, so that the clearance between the volute tongue and the impeller 8 is adjusted, and the variable R volute tongue can meet various actual working conditions.
Embodiment two:
as shown in fig. 10, the upper support body of the volute tongue is an upper support bar 6, the lower support body is a lower support bar 7, the upper support bar 6 and the lower support bar 7 are parallel to each other and distributed along the axial direction of the variable R cylinder 1, and the rear ends of the flexible volute tongue wall 4 are fixed on the upper support bar 6 and the lower support bar 7. When the volute tongue is installed, the upper supporting bar 6 and the lower supporting bar 7 are fixed on the annular wall 93 of the volute casing through the screws 10, and the rear end of the flexible volute tongue wall 4 is clamped between the upper supporting bar 6 and the annular wall 93 and between the lower supporting bar 7 and the annular wall 93, so that the installation is very reliable.
Claims (5)
1. A volute tongue, characterized in that: including support frame and locate on the support frame in order to constitute flexible volute tongue wall (4) of volute tongue outline, the support frame is including locating the last supporter of volute tongue root, lower supporter and locating the variable R cylinder (1) of volute tongue head, it is triangular distribution to go up supporter, lower supporter and variable R cylinder (1), still including being used for the drive variable R cylinder (1) pivoted actuating mechanism, the outer peripheral face of variable R cylinder (1) is smooth surface, it is last back shaft (2) to go up the supporter, the lower supporter is lower back shaft (3), the axis that goes up back shaft (2), lower back shaft (3) and variable R cylinder (1) is parallel to each other, flexible volute tongue wall (4) enclose and support the outside of going up back shaft (2), lower back shaft (3) and variable R cylinder (1).
2. A volute tongue according to claim 1, wherein: the cross section of the R-changing column body (1) is provided with a small head end (11) and a large head end (12).
3. A volute tongue according to claim 1, wherein: the driving mechanism is a motor (5), and the R-changing column body (1) is arranged on an output shaft of the motor (5).
4. A volute tongue according to claim 1, wherein: the upper support body is arranged at the front upper part of the lower support body, and the R-changing column body (1) is arranged at the front lower part of the lower support body.
5. A centrifugal fan comprising a volute (9), an impeller (8) and a volute tongue according to any of claims 1-4, the volute (9) comprising a front cover (91), a rear cover (92) and a circumferential wall (93), characterized in that: the upper support shaft (2) and the lower support shaft (3) are close to the annular wall, and two ends of the upper support shaft (2) and the lower support shaft (3) are respectively supported on the front cover (91) and the rear cover (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451180.5A CN108240354B (en) | 2017-12-27 | 2017-12-27 | Volute tongue and centrifugal fan provided with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451180.5A CN108240354B (en) | 2017-12-27 | 2017-12-27 | Volute tongue and centrifugal fan provided with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108240354A CN108240354A (en) | 2018-07-03 |
| CN108240354B true CN108240354B (en) | 2024-04-02 |
Family
ID=62701181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711451180.5A Active CN108240354B (en) | 2017-12-27 | 2017-12-27 | Volute tongue and centrifugal fan provided with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108240354B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114251288B (en) * | 2020-09-25 | 2024-04-26 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan, air outlet control method and device and range hood |
| CN114608198B (en) * | 2022-02-28 | 2023-09-01 | 江西南方锅炉股份有限公司 | Efficient pump device for boiler equipment |
| CN114738835B (en) * | 2022-04-20 | 2024-02-27 | 珠海格力电器股份有限公司 | Fresh air device, air conditioner and fresh air control method |
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|---|---|---|---|---|
| JP2011052626A (en) * | 2009-09-03 | 2011-03-17 | Mitsubishi Heavy Ind Ltd | Multi-blade centrifugal fan and air conditioner using the same |
| CN202280660U (en) * | 2011-09-15 | 2012-06-20 | 美的集团有限公司 | Centrifugal fan volute of range hood |
| CN102734866A (en) * | 2011-04-13 | 2012-10-17 | 珠海格力电器股份有限公司 | Indoor air conditioner and operation control method thereof |
| CN103089707A (en) * | 2013-03-11 | 2013-05-08 | 中国船舶重工集团公司第七0四研究所 | Centrifugal-type modularized volute |
| CN104343732A (en) * | 2014-08-29 | 2015-02-11 | 宁波方太厨具有限公司 | Volute tongue structure of fan for range hood |
| CN106246583A (en) * | 2016-08-19 | 2016-12-21 | 宁波方太厨具有限公司 | A kind of centrifugal blower and flow control methods thereof |
| CN207634388U (en) * | 2017-12-27 | 2018-07-20 | 宁波方太厨具有限公司 | A kind of volute tongue and the centrifugal blower for being equipped with the volute tongue |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8585353B2 (en) * | 2009-08-30 | 2013-11-19 | Steven Don Arnold | Variable volute turbine |
-
2017
- 2017-12-27 CN CN201711451180.5A patent/CN108240354B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011052626A (en) * | 2009-09-03 | 2011-03-17 | Mitsubishi Heavy Ind Ltd | Multi-blade centrifugal fan and air conditioner using the same |
| CN102734866A (en) * | 2011-04-13 | 2012-10-17 | 珠海格力电器股份有限公司 | Indoor air conditioner and operation control method thereof |
| CN202280660U (en) * | 2011-09-15 | 2012-06-20 | 美的集团有限公司 | Centrifugal fan volute of range hood |
| CN103089707A (en) * | 2013-03-11 | 2013-05-08 | 中国船舶重工集团公司第七0四研究所 | Centrifugal-type modularized volute |
| CN104343732A (en) * | 2014-08-29 | 2015-02-11 | 宁波方太厨具有限公司 | Volute tongue structure of fan for range hood |
| CN106246583A (en) * | 2016-08-19 | 2016-12-21 | 宁波方太厨具有限公司 | A kind of centrifugal blower and flow control methods thereof |
| CN207634388U (en) * | 2017-12-27 | 2018-07-20 | 宁波方太厨具有限公司 | A kind of volute tongue and the centrifugal blower for being equipped with the volute tongue |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108240354A (en) | 2018-07-03 |
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