CN219413024U - Centrifugal fan and range hood - Google Patents
Centrifugal fan and range hood Download PDFInfo
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- CN219413024U CN219413024U CN202223294147.5U CN202223294147U CN219413024U CN 219413024 U CN219413024 U CN 219413024U CN 202223294147 U CN202223294147 U CN 202223294147U CN 219413024 U CN219413024 U CN 219413024U
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- centrifugal fan
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- air
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Abstract
The utility model relates to a centrifugal fan and a range hood, wherein the centrifugal fan comprises a volute, an air inlet and an air outlet, and a volute tongue protruding towards the inner cavity of the volute is arranged at a position adjacent to the air outlet; the impeller is arranged in the inner cavity of the volute, and the ratio of the height H of the impeller along the axial direction of the impeller to the outer diameter D of the impeller is as follows: H/D is more than 0 and less than 0.4; the air inlet ring is annular, is arranged at the air inlet of the volute, surrounds the air inlet, and is provided with a guide surface for guiding air flow into the impeller; the air guide surface comprises an air guide section and a first circular arc section which are sequentially arranged along the circumferential direction of the air guide surface, and the air guide section corresponds to the area, close to the air outlet, in the volute, and is arranged away from the volute tongue. The air flow state of the incoming flow of the air inlet ring is changed, namely the impact of the air flow at the position corresponding to the air guide section on the impeller blades is improved, thereby reducing the blade frequency noise generated by the centrifugal fan and improving the sound quality.
Description
Technical Field
The utility model belongs to the technical field of fans, and particularly relates to a wind guide ring for a centrifugal fan and the centrifugal fan.
Background
The fan is used as a core power component of the range hood, and the aerodynamic performance of the fan directly determines the range hood efficiency of the range hood.
The requirements on the installation space of a fan system are more and more severe at present, so that the fan is required to be made to be thinner, the existing thin fan is like a centrifugal fan and a range hood of China patent No. ZL202221333661.2 (issued publication No. CN 217401261U), the existing thin fan comprises an outer rotor motor and an impeller, the outer rotor motor comprises a motor stator and a motor rotor capable of rotating relative to the motor stator, the impeller is connected with the motor rotor, the ratio of the axial height Hb of the impeller to the outer diameter D2 of the impeller is an impeller width ratio b, and b is more than or equal to 0.2 and less than or equal to 0.4. The width-to-diameter ratio of the centrifugal fan is less than or equal to 0.4, and the centrifugal fan meets the requirements of the thin fan, but when the thin fan operates, blade frequency noise is very easy to occur, so that user experience is affected.
Accordingly, there is a need for further improvements to existing centrifugal fans.
Disclosure of Invention
The first technical problem to be solved by the present utility model is to provide a centrifugal fan which can reduce blade frequency noise while meeting the requirements of a thin fan, aiming at the current state of the art.
The second technical problem to be solved by the utility model is to provide the range hood with the centrifugal fan.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: a centrifugal fan, comprising:
the volute is provided with an air inlet and an air outlet, and a volute tongue protruding towards the inner cavity of the volute is arranged at a position adjacent to the air outlet;
an impeller which is arranged in the inner cavity of the volute, and the ratio of the height H of the impeller along the axial direction of the impeller to the outer diameter D of the impeller is as follows: H/D is more than 0 and less than 0.4;
an inlet ring which is annular and is arranged at the air inlet of the volute, is arranged around the air inlet, and is provided with a guide surface for guiding air flow into the impeller;
the method is characterized in that: the air guide surface comprises an air guide section and a first circular arc section which are sequentially arranged along the circumferential direction of the air guide surface, and the air guide section corresponds to the area, close to the air outlet, in the volute, and is arranged away from the volute tongue.
The airflow velocity at the position of the air guide ring corresponding to the area close to the air outlet in the volute is larger, and the air guide section of the air inlet ring is designed to deviate from the volute tongue to be arranged and corresponds to the area close to the air outlet in the volute, so that the airflow state of the incoming flow of the air inlet ring is changed, the impact of the airflow at the position corresponding to the air guide section on the impeller blades is improved, the blade frequency noise generated by the centrifugal fan is reduced, and the sound quality is improved.
Preferably, the center of the inner peripheral edge of the first circular arc section is O, and the radius R1 of the first circular arc section is larger than the distance between the inner peripheral edge of the air guiding section and the center of the circle O.
One of the design forms of the air guide section is as follows: the wind guide section is a straight section, and two ends of the straight section are respectively connected with corresponding ends of the first arc section.
In order to ensure enough air inlet area and increase the flowing space of enough lampblack airflow, the distance L and the radius R1 satisfy the following conditions: L/R1 is more than or equal to 0.7 and less than or equal to 0.85.
The design form of the air guide section is two: the wind guide section is a second circular arc section, the second circular arc section and the first circular arc section are concentrically arranged, and two ends of the second circular arc section are respectively connected with corresponding ends of the first circular arc section through connecting sections. The design form of the second circular arc section changes the state of incoming air flow, thereby slowing down the impact on the impeller blades and reducing the blade frequency noise.
In order to reduce the leaf frequency noise better, the radius R1 of the first circular arc section and the radius R2 of the second circular arc section satisfy the following conditions: R2/R1 is more than or equal to 0.8 and less than or equal to 0.9.
Further, two ends of the inner peripheral edge of the second circular arc section are respectively a point A and a point B, an included angle formed by a connecting line OA of the circle center O and the point A and an OB of the circle center O and the point B is alpha, and the included angle alpha meets the following conditions: alpha is more than or equal to 45 degrees and less than or equal to 90 degrees.
Preferably, the center of the circle along the inner periphery of the first arc section is O, a tangent line passing through the center O on the volute tongue is OC, an included angle formed by the tangent line OC and a horizontal line passing through the center O is β, and the included angle β satisfies: beta is more than 0 and less than 60 degrees.
In order to reduce the peak value of the blade frequency of the impeller and avoid the generation of howling abnormal sound, one end of the inner peripheral edge of the air guide section, which is adjacent to the volute tongue, is provided with a point A, the center of the inner peripheral edge of the first circular arc section is provided with O, the connecting line of the center O and the point A is provided with OA, the tangent line passing through the center O on the volute tongue is provided with OC, the included angle formed by the tangent line OC and the OA is theta, and the included angle theta is satisfied: θ is 0 < 45 °.
In order to facilitate the installation of the air inlet ring, the air inlet ring further comprises an annular wall extending outwards along the radial direction from the outer edge of the flow guide surface, and the annular wall is installed on a wall plate where the air inlet of the volute is located.
The utility model solves the second technical problem by adopting the technical proposal that: the utility model provides a range hood, includes the casing and locates centrifugal fan in the casing, its characterized in that: the centrifugal fan is the centrifugal fan.
Compared with the prior art, the utility model has the advantages that: the air guide section of the air inlet ring is designed to deviate from the volute tongue, and corresponds to the area, close to the air outlet, in the volute, of the air inlet ring, so that the air flow state of incoming flow of the air inlet ring is changed, namely, the impact of air flow at the position corresponding to the air guide section on the impeller blades is improved, thereby reducing the blade frequency noise generated by the centrifugal fan, namely, reducing the blade frequency howling abnormal sound of the impeller, and improving the sound quality.
Drawings
Fig. 1 is a schematic view showing a part of the structure of a centrifugal fan according to embodiment 1;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the exploded perspective view of FIG. 2;
FIG. 4 is a schematic view of the impeller of FIG. 1;
fig. 5 is a schematic view showing a part of the structure of the centrifugal fan of embodiment 2.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
Example 1:
as shown in fig. 1 to 4, the 1 st preferred embodiment of the present utility model.
As shown in fig. 1 to 3, the centrifugal fan of the present embodiment includes a volute 1, an impeller 3, and an inlet ring 2. The volute 1 comprises a front cover plate 12, a rear cover plate 13 and a ring wall 14, wherein the front cover plate 12 and the rear cover plate 1 are oppositely arranged, and the ring wall 14 is arranged between the front cover plate 12 and the rear cover plate 1. The front cover 12 is provided with an air inlet 101, and an air outlet 102 for air flow to flow out is defined between the front cover 12, the rear cover 13 and the annular wall 14. The volute 1 has a volute tongue 11, specifically, the volute tongue 11 is disposed on the annular wall 14, and is disposed adjacent to the air outlet 102 and protrudes into the inner cavity of the volute 1.
As shown in fig. 4, the ratio of the height H of the impeller 3 along the axial direction thereof to the outer diameter D of the impeller 3 satisfies: H/D is more than 0 and less than 0.4. The centrifugal fan is a thin fan. As shown in fig. 1 to 3, the impeller 3 is disposed in the inner cavity of the volute 1, and includes a vane 31, a front plate 32, a middle plate 33 and a rear plate 34 sequentially disposed from front to back, wherein the front and rear ends of the vane 31 are respectively mounted on the front plate 32 and the rear plate 34, and the middle plate 33 is provided with an opening through which the vane 31 passes.
As shown in fig. 1 to 3, the inlet ring 2 is annular and is mounted at the inlet 101 of the volute 1, is arranged around the inlet 101, and has a guide surface 21 for guiding the air flow into the impeller 3. The aforementioned inlet ring 2 further comprises an annular wall 22 extending radially outwardly from the outer edge of the flow guiding surface 21, the annular wall 22 being mounted on the wall plate of the volute 1 where the inlet 101 is located, i.e. on the front cover plate 12 of the volute 1.
As shown in fig. 1, the air guiding surface 21 includes an air guiding section and a first arc section 211 sequentially arranged along the circumferential direction, and the center of the inner circumference of the first arc section 211 is O. As shown in fig. 2 and 3, the air guiding section corresponds to the area 10 of the volute 1 near the air outlet 102, and in this embodiment, the air guiding section is located on the left side of the volute tongue 11 and is disposed offset from the volute tongue 11. Specifically, the air guiding section is a second arc section 213, the second arc section 213 and the first arc section 211 are concentrically arranged, and two ends of the second arc section 213 are connected with corresponding ends of the first arc section 211 through connecting sections 214 respectively. The radius R1 of the first arc segment 211 is greater than the radius R2 of the second arc segment 213, and the radii R1 and R2 satisfy: R2/R1 is more than or equal to 0.8 and less than or equal to 0.9. The two ends of the inner peripheral edge of the second circular arc segment 213 are respectively a point a and a point B, wherein the point a is arranged adjacent to the volute tongue 11, and the point B is arranged far away from the volute tongue 11. The included angle formed by the connecting line OA of the circle center O and the point A and the OB of the circle center O and the point B is alpha, and the included angle alpha meets the following conditions: alpha is more than or equal to 45 degrees and less than or equal to 90 degrees.
In this embodiment, as shown in fig. 1, a tangent line passing through the center O on the volute tongue 11 is OC, an included angle formed by the tangent line OC and a horizontal line passing through the center O is β, and the included angle β satisfies: beta is more than 0 and less than 60 degrees. The included angle formed by the tangent OC and the connecting line OA is theta, and the included angle theta meets the following conditions: θ is 0 < 45 °.
The centrifugal fan is applied to the range hood, and the range hood comprises a shell (not shown) and the centrifugal fan, wherein the centrifugal fan is positioned in the shell, and the centrifugal fan is adopted.
In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.
Example 2:
as shown in fig. 5, there is a 2 nd preferred embodiment of the present utility model.
This embodiment differs from embodiment 1 described above only in that: the wind guiding section is a straight section 212, and two ends of the straight section 212 are respectively connected with corresponding ends of the first circular arc section 211. Specifically, the distance between the inner edge of the straight section 212 and the center O is L, and the distance L and the radius R1 satisfy: L/R1 is more than or equal to 0.7 and less than or equal to 0.85.
Claims (11)
1. A centrifugal fan, comprising:
the spiral case (1) is provided with an air inlet (101) and an air outlet (102), and the spiral case (1) is provided with a spiral tongue (11) protruding towards the inner cavity of the spiral case (1) at a position adjacent to the air outlet (102);
an impeller (3) which is disposed in the inner cavity of the volute (1), and the ratio of the height H of the impeller (3) along the axial direction thereof to the outer diameter D of the impeller (3) satisfies: H/D is more than 0 and less than 0.4;
an inlet ring (2) which is annular and is arranged at an air inlet (101) of the volute (1), is arranged around the air inlet (101), and is provided with a guide surface (21) for guiding air flow into the impeller (3);
the method is characterized in that: the air guide surface (21) comprises an air guide section and a first circular arc section (211) which are sequentially arranged along the circumferential direction of the air guide surface, wherein the air guide section corresponds to an area (10) which is close to an air outlet (102) in the volute (1) and is deviated from the volute tongue (11).
2. The centrifugal fan according to claim 1, wherein: the circle center of the inner peripheral edge of the first circular arc section (211) is O, and the radius R1 of the first circular arc section (211) is larger than the distance between the inner peripheral edge of the air guide section and the circle center O.
3. The centrifugal fan according to claim 2, wherein: the wind guide section is a straight section (212), and two ends of the straight section (212) are respectively connected with corresponding ends of the first circular arc section (211).
4. A centrifugal fan according to claim 3, wherein: the distance L and the radius R1 satisfy: L/R1 is more than or equal to 0.7 and less than or equal to 0.85.
5. The centrifugal fan according to claim 2, wherein: the wind guide section is a second circular arc section (213), the second circular arc section (213) and the first circular arc section (211) are concentrically arranged, and two ends of the second circular arc section (213) are respectively connected with corresponding ends of the first circular arc section (211) through connecting sections (214).
6. The centrifugal fan according to claim 5, wherein: the radius R1 of the first circular arc section (211) and the radius R2 of the second circular arc section (213) satisfy the following conditions: R2/R1 is more than or equal to 0.8 and less than or equal to 0.9.
7. The centrifugal fan according to claim 5, wherein: two ends of the inner peripheral edge of the second circular arc section (213) are respectively a point A and a point B, an included angle formed by a connecting line OA of a circle center O and the point A and an OB of the circle center O and the point B is alpha, and the included angle alpha meets the following conditions: alpha is more than or equal to 45 degrees and less than or equal to 90 degrees.
8. The centrifugal fan according to claim 1, wherein: the center of the circle along the inner periphery of the first circular arc section (211) is O, a tangent line passing through the center O on the volute tongue (11) is OC, an included angle formed by the tangent line OC and a horizontal line passing through the center O is beta, and the included angle beta meets the following conditions: beta is more than 0 and less than 60 degrees.
9. The centrifugal fan according to claim 1, wherein: the inner periphery of the air guide section is adjacent to one end of the volute tongue (11) and is a point A, the center of the inner periphery of the first circular arc section (211) is O, the connecting line of the center O and the point A is OA, a tangent line passing through the center O on the volute tongue (11) is OC, an included angle formed by the tangent line OC and the OA is theta, and the included angle theta meets the following conditions: θ is 0 < 45 °.
10. The centrifugal fan according to claim 1, wherein: the air inlet ring (2) further comprises an annular wall (22) extending outwards along the radial direction from the outer edge of the flow guiding surface (21), and the annular wall (22) is arranged on a wall plate where the air inlet (101) of the volute (1) is located.
11. The utility model provides a range hood, includes the casing and locates centrifugal fan in the casing, its characterized in that: the centrifugal fan employing the centrifugal fan according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294147.5U CN219413024U (en) | 2022-12-08 | 2022-12-08 | Centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294147.5U CN219413024U (en) | 2022-12-08 | 2022-12-08 | Centrifugal fan and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219413024U true CN219413024U (en) | 2023-07-25 |
Family
ID=87236067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223294147.5U Active CN219413024U (en) | 2022-12-08 | 2022-12-08 | Centrifugal fan and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219413024U (en) |
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2022
- 2022-12-08 CN CN202223294147.5U patent/CN219413024U/en active Active
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