CN218862936U - Volute of centrifugal fan, centrifugal fan and range hood - Google Patents
Volute of centrifugal fan, centrifugal fan and range hood Download PDFInfo
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- CN218862936U CN218862936U CN202223231712.3U CN202223231712U CN218862936U CN 218862936 U CN218862936 U CN 218862936U CN 202223231712 U CN202223231712 U CN 202223231712U CN 218862936 U CN218862936 U CN 218862936U
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- volute
- centrifugal fan
- tongue
- cover plate
- edge
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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
Abstract
The utility model relates to a volute of a centrifugal fan, which comprises a front cover plate, a rear cover plate and a ring wall, wherein the ring wall is arranged between the front cover plate and the rear cover plate; the front cover plate, the rear cover plate and the annular wall jointly define a volute inner cavity and an air outlet positioned at the top; the volute tongue is arranged on the inner side of the annular wall, is adjacent to the air outlet and is provided with a lower surface positioned in the inner cavity of the volute and an upper surface exposed outside the inner cavity of the volute along the flow path of the fluid; the upper surface or/and the lower surface of the volute tongue is provided with at least one group of concave parts, each group is provided with at least two concave parts, and the concave parts are distributed at intervals along the tongue tip of the volute tongue towards the tongue root. The vortex shedding formed at the volute tongue of the airflow is reduced, the airflow can be smoothly discharged out of the air outlet, the pressure and the exhaust efficiency of the centrifugal fan can be maintained, and the noise can be reduced.
Description
Technical Field
The utility model relates to a centrifugal fan technical field especially relates to a centrifugal fan's spiral case, centrifugal fan and range hood.
Background
The centrifugal fan is the main power system of the range hood and other ventilation equipment, and has the characteristics of compact structure, low noise, high pressure coefficient, large flow coefficient and the like. The centrifugal fan comprises a volute, a volute tongue arranged in the volute, an impeller and the like. The airflow in the centrifugal fan and the volute tongue mainly have the following two functions. Firstly, due to the existence of the volute tongue, the gas generates vortex after flowing through the volute tongue, due to the existence of large flow and adverse pressure gradient, backflow occurs between the volute tongue and the impeller, a part of gas flow is mixed into the volute again to be circulated, and is not discharged out of the outlet of the fan, so that the efficiency and the pressure of the fan are reduced. Secondly, the airflow periodically acts on the volute tongue, unsteady pressure pulsation is formed on the surface of the volute tongue, and a shedding vortex shedding from the surface of the volute tongue is added, so that the centrifugal fan has higher noise.
For example, chinese utility model patent with application number CN202120629410.8 (publication number CN 215333507U) discloses "a centrifugal fan", which includes a volute, which includes a main body and an air outlet part, wherein the main body is internally limited with a containing space for installing a centrifugal impeller, the air outlet part is formed by extending from the circumference of the main body, an air outlet channel is defined in the air outlet part, and the air outlet part forms an air outlet at the end of the air outlet channel; the side of the volute tongue facing the air outlet forms an outer air guide surface, and the side of the volute tongue far away from the air outlet forms an inner air guide surface; the guide grooves are arranged on the surface of the volute tongue, extend from the tongue root on one side of the inner air guide surface to the tongue root on one side of the outer air guide surface through the tongue tip, and the width of each guide groove decreases progressively along the extending direction. Through the design of carrying out the guiding gutter to the snail tongue part, improved the air current smoothness degree of air outlet department, reduced the noise of air outlet.
However, the flow guide groove extends from the tongue root at one side of the inner air guide surface to the tongue root at one side of the outer air guide surface through the tongue tip, so that the number of falling vortexes at the volute tongue is relatively large, and the problems that the airflow is not convenient to discharge out of the air outlet smoothly and the noise is large still exist to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the first technical problem that will solve is to prior art's current situation, provides the centrifugal fan's of the whirlpool that drops that can reduce snail tongue department spiral case.
The utility model aims to solve the second technical problem that a centrifugal fan is provided.
The utility model aims to solve the third technical problem that a range hood is provided.
The utility model discloses a solve the technical scheme that above-mentioned first technical problem adopted and be: a volute of a centrifugal fan comprises
A front cover plate;
a rear cover plate;
the annular wall is arranged between the front cover plate and the rear cover plate;
the front cover plate, the rear cover plate and the annular wall jointly define a volute inner cavity and an air outlet positioned at the top; also comprises
The volute tongue is arranged on the inner side of the annular wall, is adjacent to the air outlet and is provided with a lower surface positioned inside the inner cavity of the volute and an upper surface exposed outside the inner cavity of the volute along the flow path of the fluid;
the method is characterized in that:
the upper surface or/and the lower surface of the volute tongue is provided with at least one group of concave parts, each group is provided with at least two concave parts, and the concave parts are distributed at intervals along the tongue tip of the volute tongue towards the tongue root.
In order to further reduce the shedding vortex at the volute tongue, the concave parts are provided with at least two groups and are distributed at intervals along the axial direction of the volute. If the number of the concave parts is larger and the concave parts are distributed at different positions, the falling vortex at the volute tongue can be further reduced.
In order to further reduce the shedding vortex at the volute tongue, the length of the concave part is L along the axial direction of the volute 1 The distance between two adjacent groups of concave parts is L 2 ，L 1 >L 2 . Thus, the corresponding area of the concave part is the same as that of the concave partThe effect of reducing the shedding vortex is better.
In order to facilitate the air flow entering the concave part, the central part of the concave part is deep, the peripheral part of the concave part is shallow, and the concave part is gradually and smoothly transited. In this way, the flow of air into the recess is facilitated.
The shape of the concave part can be various, and for the convenience of manufacture, the section formed by cutting the concave part along the radial plane of the volute is semicircular, and the radius of the semicircular is recorded as R 3 ，R 3 The range of (A) is 1.8 to 2.2mm. This facilitates manufacture.
In order to reduce the shedding vortex at the volute tongue, the concave portion extends in the radial direction of the volute. Therefore, the extending direction of the concave part forms an angle with the extending direction of the airflow, so that the falling vortex at the volute tongue is reduced.
The volute tongue can be arranged at different positions, and the cross section formed by cutting the volute tongue along the radial plane of the volute casing has the shape of a section which is convenient for discharging airflow
A mounting edge connected to the inner side of the annular wall and extending in a radial direction of the volute;
an upper edge, one end of which is connected with the top end of the mounting edge;
a lower edge, one end of which is connected with the bottom end of the mounting edge;
a front edge connected to the other end of the upper edge and the other end of the lower edge, respectively;
recording a vertical straight line passing through the center of the volute as H;
the included angle between the mounting edge and the vertical straight line H is alpha 1 ，α 1 Is 18 degrees to 20 degrees;
the line connecting the farthest end of the front edge and the center of the volute forms an included angle alpha with a vertical straight line H 2 ，α 2 29-32 degrees;
the included angle between the upper edge and the horizontal plane is beta, and the beta is 114-117 degrees;
the distance between the vertex formed by connecting the mounting edge and the lower edge and the center of the volute is R 1 ，R 1 Is 115-119 mm.
In this way, the volute tongue is mounted in a suitable position to facilitate airflow discharge.
To facilitate the discharge of the air flow, the front edge is in the form of an outwardly convex half-circle having a radius R 2 ，R 2 Is 4-7 mm. In this way, the air flow is facilitated to be discharged.
The utility model discloses a solve the technical scheme that above-mentioned second technical problem adopted and be: a centrifugal fan, its characterized in that: a volute such as the centrifugal fan described above is applied.
The utility model discloses a solve the technical scheme that above-mentioned third technical problem adopted and be: a range hood, its characterized in that: a volute such as the centrifugal fan described above is applied.
Compared with the prior art, the utility model has the advantages of: the upper surface or/and the lower surface of the volute tongue is/are provided with at least one group of concave parts, each group is provided with at least two concave parts which are distributed at intervals along the tongue tip of the volute tongue towards the tongue root, the concave parts play a role in reducing drag and stabilizing flow, and the falling vortex of airflow at the volute tongue is reduced, so that the airflow can be smoothly discharged out of an air outlet, and the pressure and the exhaust efficiency of a centrifugal fan can be maintained;
in addition, because the falling vortex and the concave part formed at the volute tongue by the airflow are reduced, the impact effect of the airflow on the volute tongue can be weakened, and the noise is reduced.
Drawings
Fig. 1 is a schematic perspective view of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a schematic view of FIG. 1 with the front cover plate removed;
FIG. 3 is an enlarged schematic view of portion A of FIG. 2;
FIG. 4 is a schematic view of the centrifugal fan of FIG. 2 from another angle;
FIG. 5 is an enlarged view of detail B of FIG. 4;
FIG. 6 is a perspective view of a volute tongue according to an embodiment of the present invention;
FIG. 7 is a schematic view of the volute tongue of FIG. 6 at another angle;
FIG. 8 is a cross-sectional view of the volute tongue of FIG. 6 taken along the direction C-C;
fig. 9 is a schematic view of the installation position of the volute tongue of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1 to 9, a preferred embodiment of the volute of the centrifugal fan of the present invention is shown. The volute of the centrifugal fan comprises a front cover plate 1, a rear cover plate 2, a circular wall 3 and a volute tongue 5.
Wherein the circumferential wall 3 is arranged between the front cover plate 1 and the rear cover plate 2.
And the front cover plate 1, the rear cover plate 2 and the annular wall 3 jointly define a volute inner cavity and an air outlet 4 positioned at the top.
The volute tongue 5 is arranged on the inner side of the annular wall 3 and adjacent to the air outlet 4, and along the flow path of the fluid, the volute tongue 5 has a lower surface 52 located inside the inner cavity of the volute and an upper surface 51 exposed outside the inner cavity of the volute. The upper surface 51 and the lower surface 52 of the volute tongue 5 are provided with nine groups of concave parts 53 which are distributed at intervals along the axial direction of the volute. Each group has eight concave parts 53 which are distributed at intervals along the tongue tip of the volute tongue 5 towards the tongue root. Each concave portion 53 extends in the volute radial direction. In other embodiments, at least one set of concave portions 53 may be provided on only the upper surface or only the lower surface, the number of concave portions 53 in each set may be two, the number of sets of concave portions 53 may be two, and the number of concave portions 53 in each set may also be adjusted as needed. The length of the concave portion 53 is L in the axial direction of the scroll casing 1 The distance between two adjacent sets of concave portions 53 is L 2 ，L 1 >L 2 。L 1 Has a range of 9 to 11mm 2 The range of (2) is 4 to 6mm. The concave portion 53 has a deep central portion and a shallow peripheral portion and gradually and smoothly transitions. Preferably, the cross-section of the volute, taken along a radial plane of the volute, by cutting the recess 53, is semicircular, the radius of which is denoted R 3 ，R 3 The range of (A) is 1.8 to 2.2mm.
The cross-section formed by cutting the volute tongue 5 along the radial plane of the volute has a mounting edge 54, an upper edge 55, a lower edge 56, a front edge 57. The mounting edge 54 is connected to the inner side of the ring wall 3 and extends in the radial direction of the volute. Specifically, the upper edge 55 is connected at one end thereof to the top end of the mounting edge 54. Lower edge 56 has one end connected toThe bottom ends of the mounting edges 54 are connected. The front edge 57 connects the other end of the upper edge 55 and the other end of the lower edge 56, respectively. The front edge 57 is in the form of an outwardly convex semicircle with a radius R 2 ，R 2 Is 4-7 mm. Recording a vertical straight line passing through the center of the volute as H according to the projection of the volute falling on a vertical plane along the radial direction; the mounting edge 54 forms an angle α with the vertical line H 1 ，α 1 Is 18 to 20 degrees; the line connecting the farthest end of the front edge 57 and the center of the volute forms an included angle alpha with the vertical straight line H 2 ，α 2 29-32 degrees; the included angle between the upper edge 55 and the horizontal plane is beta, and the beta is 114-117 degrees; the mounting edge 54 is connected to the lower edge 56 to form a vertex at a distance R from the center of the volute 1 ，R 1 115-119 mm.
The utility model also provides a centrifugal fan, the spiral case that uses there is foretell centrifugal fan.
The utility model also provides a range hood, the spiral case that uses there is foretell centrifugal fan.
The working principle of the utility model is as follows.
The concave part 53 of the volute tongue 5 is used for accommodating flowing air flow, the vortex of the air flow is embedded into the concave part 53, the concave part 53 has the effects of reducing drag and stabilizing flow, the falling vortex formed at the volute tongue 5 by the air flow is reduced, the air flow is favorably discharged out of the air outlet 4 smoothly, and the pressure and the exhaust efficiency of the centrifugal fan are favorably maintained;
in addition, because the falling vortex formed at the volute tongue 5 by the airflow is reduced, and the concave part 53 can weaken the impact effect of the airflow on the volute tongue 5, the noise is also reduced.
Claims (10)
1. A volute of a centrifugal fan comprises
A front cover plate (1);
a rear cover plate (2);
the annular wall (3) is arranged between the front cover plate (1) and the rear cover plate (2);
the front cover plate (1), the rear cover plate (2) and the annular wall (3) jointly define a volute inner cavity and an air outlet (4) positioned at the top; also comprises
The volute tongue (5) is arranged on the inner side of the annular wall (3) and is adjacent to the air outlet (4), and along the flow path of the fluid, the volute tongue (5) is provided with a lower surface (52) positioned inside the inner cavity of the volute and an upper surface (51) exposed outside the inner cavity of the volute;
the method is characterized in that:
the upper surface (51) or/and the lower surface (52) of the volute tongue (5) is/are provided with at least one group of concave parts (53), each group is provided with at least two concave parts (53), and the concave parts are distributed at intervals along the tongue tip of the volute tongue (5) towards the tongue root.
2. The volute of a centrifugal fan of claim 1, wherein: the concave portions (53) have at least two groups and are distributed at intervals along the axial direction of the volute.
3. The volute of a centrifugal fan of claim 2, wherein: the length of the recessed portion (53) is L along the axial direction of the volute 1 The distance between two adjacent groups of concave parts (53) is L 2 ，L 1 >L 2 。
4. The volute of a centrifugal fan of claim 1, wherein: the central part of the concave part (53) is deep, the peripheral part is shallow and is gradually and smoothly transited.
5. The volute of a centrifugal fan of claim 4, wherein: the cross section formed by cutting the concave part (53) along the radial plane of the volute is semicircular, and the radius of the semicircle is recorded as R 3 ，R 3 The range of (1.8) to (2.2) mm.
6. The volute of a centrifugal fan of claim 1, wherein: the recessed portion (53) extends in a volute radial direction.
7. The volute of a centrifugal fan of claim 1, wherein: the cross section formed by cutting the volute tongue (5) along the radial plane of the volute casing has
A mounting edge (54) connected to the inner side of the annular wall (3) and extending in the radial direction of the volute;
an upper edge (55) having one end connected to the top end of the mounting edge (54);
a lower edge (56) connected at one end to the bottom end of the mounting edge (54);
a front edge (57) which connects the other end of the upper edge (55) and the other end of the lower edge (56), respectively;
recording a vertical straight line passing through the center of the volute as H according to the projection of the volute falling on a vertical plane along the radial direction;
the mounting edge (54) forms an angle alpha with the vertical line H 1 ，α 1 Is 18 degrees to 20 degrees;
the line connecting the farthest end of the front edge (57) and the center of the volute forms an included angle alpha with a vertical straight line H 2 ，α 2 29 to 32 degrees;
the included angle between the upper edge (55) and the horizontal plane is beta, and the beta is 114-117 degrees;
the mounting edge (54) and the lower edge (56) are connected to form a vertex which is at a distance R from the center of the volute 1 ，R 1 115-119 mm.
8. The volute of a centrifugal fan of claim 7, wherein: the front edge (57) is in the form of an outwardly convex semi-circle having a radius R 2 ，R 2 Is 4-7 mm.
9. A centrifugal fan, its characterized in that: volute housing for a centrifugal fan, to which a centrifugal fan according to any of claims 1-8 is applied.
10. A range hood, its characterized in that: volute for application of a centrifugal fan according to any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223231712.3U CN218862936U (en) | 2022-11-30 | 2022-11-30 | Volute of centrifugal fan, centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223231712.3U CN218862936U (en) | 2022-11-30 | 2022-11-30 | Volute of centrifugal fan, centrifugal fan and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218862936U true CN218862936U (en) | 2023-04-14 |
Family
ID=87370713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223231712.3U Active CN218862936U (en) | 2022-11-30 | 2022-11-30 | Volute of centrifugal fan, centrifugal fan and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218862936U (en) |
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2022
- 2022-11-30 CN CN202223231712.3U patent/CN218862936U/en active Active
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