CN220769786U - Current collector, fan and range hood - Google Patents
Current collector, fan and range hood Download PDFInfo
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- CN220769786U CN220769786U CN202321685473.0U CN202321685473U CN220769786U CN 220769786 U CN220769786 U CN 220769786U CN 202321685473 U CN202321685473 U CN 202321685473U CN 220769786 U CN220769786 U CN 220769786U
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Abstract
The utility model discloses a current collector and a range hood. The current collector is arranged at an air inlet of a fan of the range hood and comprises a current collecting body; a plurality of pre-rotation guide vanes are arranged on the inner side of the collecting body, the first end of each pre-rotation guide vane is connected with the flow collecting body, and two adjacent pre-rotation guide vanes are arranged at intervals; the air homogenizing net is arranged on the pre-rotation partThe inner side of the guide vane is connected with the second end of the pre-rotation guide vane; the impeller of the fan and the current collector satisfy the relation: d (D) b ‑D a1 Not less than 2W; wherein D is b D is the inner diameter of the impeller of the fan a1 For the inside diameter of the pre-rotation vane, W is the minimum radial clearance requirement between the collector and the impeller.
Description
Technical Field
The utility model relates to the technical field of kitchen electricity, in particular to a current collector, a fan and a range hood.
Background
Referring to fig. 1 and 2, a fan of a range hood includes a wind cabinet 1 ', a collector 2 ' and a wind wheel assembly including an impeller 3 ' and a motor driving the impeller to rotate. When the range hood is in operation, a safety gap for the cooperation of the separation and collection device 2 'and the impeller 3' needs to be ensured. The axial or radial clearance between the collector 2 'and the impeller 3' is usually 8mm or more to meet the requirements of transportation, drop and other tests.
When the range hood is operated, larger flue resistance is usually needed to be overcome, the current collector 2 'is usually extended into the impeller 3', and radial clearance is preferentially ensured to improve the anti-surge capability of the fan and reduce the leakage loss of the fan. This design will lead to two problems:
problem one: radial dimension D of collector 2' into impeller 3 a0 Must be smaller than the inner diameter D of the impeller b0 And in the actual result, when the clearance of the moving parts is ensured and the thickness of the material is considered, the effective air inlet area of the current collector 2' is further reduced.
And a second problem: since the part of the impeller 3 'near the air inlet is blocked by the collector 2', the blades of this part of the impeller 3 'do not work on the air flow, in fact being an inactive area (as shown in fig. 2, the position indicated by the arrow a is the inactive area of the impeller 3').
Two conventional processing methods for the above problems are respectively:
traditional solution one: in the axial direction, a structural gap is ensured between the impeller 3 ' and the collector 2 ', the collector 2 ' does not penetrate into the impeller 3 ', so that the collector 2 'Is of the radial dimension D of (2) a0 An inner diameter D greater than or equal to the impeller 3 b0 The effective air inlet area of the current collector 2' is enlarged.
The scheme has the defects that: the impeller 3 'and the collector 2' have an axial clearance, which results in increased leakage loss and reduced fan performance. D (D) a0 ≥D b0 The coverage area of the collector on the air inlet side of the impeller 3' is reduced, and the air outlet of the fan is easy to generate surge phenomenon under high back pressure.
And the traditional solution scheme II is as follows: the structural gap between the impeller 3 'and the collector 2' is ensured in the radial direction, the collector 2 'extends into the impeller 3' (the depth of the collector 2 'extending into the impeller 3' is H as shown in figure 2), and D a0 ≥D b0 At this time, the impeller 3 'and the collector 2' will interfere or the structural gap will be insufficient. The inner sides of the blades at the inlet of the impeller 3 'are therefore chamfered or cut off with a greater inclination, giving way to the collector 2' to meet the minimum radial clearance requirements.
The scheme has the defects that: after the inner side of the blade at the air inlet of the impeller 3' is subjected to chamfering or cutting with a large inclination, the functional force of the blade is weakened or even lost, and the problem of the effective width reduction of the blade still exists.
In addition, when the range hood operates, negative pressure is formed in the centrifugal fan by rotation of the impeller 3 ', and air flows through the collector 2' and enters the volute. Because the asymmetry of the design of the volute molded lines and the factors such as the modeling of the smoke collecting structure of the range hood, the limit of the space of the box body, the blocking of other parts and the like lead the layout of an air duct in the range hood to be relatively complex, the circumferential negative pressure distribution of the current collector 2' is not symmetrical along the rotation center, the airflow state of the oil smoke entering the impeller is disordered, the speed is uneven, the performance of the fan is influenced to a certain extent, and the pneumatic noise is large.
In order to improve the air intake state, a resistance member or a flow guiding member, such as an annular iron grille guard, a honeycomb iron guard, etc., is usually applied to the collector 2 ' to make the air intake pressure of the collector 2 ' more uniform, or to improve the air flow direction, so that the air intake flow direction is consistent with the rotation direction of the impeller 3 ', to improve the aerodynamic noise, but the flow state of the part of the air intake of the impeller 3 ' covered by the collector 2 ' cannot be improved.
Accordingly, a current collector is needed to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to solve one of the problems in the prior art to at least a certain extent, and therefore, the utility model provides the current collector, which prerotates the ball close to the impeller of the fan by arranging the prerotation guide vane, improves the smoothness of air intake, ensures that the air intake speed of air flow is more uniform, reduces the pneumatic noise and ensures the performance of the fan.
The above object is achieved by the following technical scheme:
a current collector installed at an air inlet of a fan of a range hood, the current collector comprising:
a current collecting body;
a plurality of pre-rotation guide vanes are arranged on the inner side of the collecting body, the first end of each pre-rotation guide vane is connected with the flow collecting body, and two adjacent pre-rotation guide vanes are arranged at intervals;
the air homogenizing net is arranged on the inner side of the pre-rotation guide vane and is connected with the second end of the pre-rotation guide vane;
the impeller of the fan and the current collector satisfy the relation: d (D) b -D a1 ≥2W；
Wherein D is b D is the inner diameter of the impeller of the fan a1 For the inside diameter of the pre-rotation vane, W is the minimum radial clearance requirement between the collector and the impeller.
Optionally, the air inlet diameter D of the collecting body a ≥D b The flow collecting body is positioned on the outer side of the end face of the impeller, a gap t is formed between the flow collecting body and the side face of the impeller, and the relationship between the impeller of the fan and the flow collector is also satisfied: t is greater than or equal to t min ，D a1min -D b ≥2t min ；
Wherein t is min The minimum axial clearance between the collecting body and the impeller is the straight position at the minimum distance between the pre-rotation guide vane and the impellerAnd (3) diameter.
Optionally, the distance between the pre-rotation guide vane and the end face of the impeller is L, and L is less than or equal to 0.
Optionally, two adjacent pre-rotation guide vanes are arranged at the same distance, the number of the pre-rotation guide vanes is M, the thickness of the pre-rotation guide vanes is A, the number of blades of an impeller of the fan is N, the thickness of the blades is B, M is more than or equal to 0.5 and less than or equal to 1.5N, and A is more than or equal to 0.3 and less than or equal to 10B.
Optionally, the pre-rotation guide vane is twisted axially to form a first twisted top end and a second twisted top end, the protruding directions of the first twisted top end and the second twisted top end are the same as the rotation direction of the impeller, the first twisted top end is an air inlet, the second twisted top end is an air outlet, and the tangent line of the first twisted top end is equal to the air inlet diameter D of the collecting body a The angle between the tangent line of the circle is F2, and the tangent line of the second twisted tip and the inner diameter D of the pre-rotation guide vane a1 The angle between the tangent lines of the round shape is F1, F2E [ 0-90 ]]，F1∈[0-α+25°]，F1≤F2；
Wherein alpha is the air inlet placement angle of the blade.
Optionally, in the axial direction, the first twisted tip of the pre-rotation vane is collinear with the air inlet of the blade.
Optionally, the pre-rotation guide vane is orthographically projected in the circumferential direction as a smooth curve, the smooth curve being composed of one or more of a circular arc line, a bezier curve and a multi-segment curve.
Optionally, the pre-rotation guide vane is twisted in the axial direction, and the twist angle is theta, theta epsilon [0 ° -90 ° ].
Optionally, the gas homogenizing net is arranged in a protruding way in a direction opposite to the airflow flowing direction, and the distance between the highest point of the gas homogenizing net in the axial direction and the collecting body is G 2 The distance between the highest point of the flow collecting body in the axial direction and the side surface of the flow collecting body, which is far away from the impeller of the fan, is G 1 ，0.5D a2 ≥G 2 ≥G 1 ；
Wherein D is a2 Is the diameter of the gas homogenizing net.
Optionally, the gas homogenizing net is a honeycomb net, and the cross section of the gas homogenizing net is one or more of parabola, circular arc and Bezier curve.
Alternatively, 0.5D b ≤D a2 ≤0.9D b ；
Wherein D is b Is the inner diameter of the impeller of the fan.
The utility model further provides a fan, which comprises a wind cabinet, a wind wheel assembly and the current collector, wherein the wind wheel assembly and the current collector are arranged in the wind cabinet, the current collector is arranged on the wind cabinet, and the wind wheel assembly comprises a motor and an impeller in transmission connection with the motor.
The utility model also provides a range hood, which comprises the fan.
Compared with the prior art, the utility model at least comprises the following beneficial effects:
the current collector provided by the utility model is arranged at an air inlet of a fan of a range hood, and comprises a current collecting body, a gas distribution net and a plurality of pre-rotation guide vanes. The plurality of pre-rotation guide vanes are arranged on the inner side of the collecting body, the first ends of the pre-rotation guide vanes are connected with the collecting body, and two adjacent pre-rotation guide vanes are arranged at intervals. The gas homogenizing net is arranged on the inner side of the pre-rotation guide vane and is connected with the second end of the pre-rotation guide vane. D (D) b -D a1 And is more than or equal to 2W. Wherein D is b Is the inner diameter of the impeller of the fan, D a1 The inside diameter W of the pre-rotation guide vane is the minimum clearance requirement between the current collector and the fan in the axial direction or the radial direction, so that the minimum radial clearance requirement is met between the current collector and the fan, and meanwhile, the ball close to the impeller of the fan is pre-rotated by arranging the pre-rotation guide vane, so that the air inlet smoothness is improved, the air inlet speed of the air flow is more uniform, the pneumatic noise is reduced, and the performance of the fan is ensured.
Drawings
FIG. 1 is a schematic view of a prior art fan in partial cross-section;
FIG. 2 is a schematic cross-sectional structural view of a prior art fan;
FIG. 3 is a schematic perspective view of a fan provided in an embodiment of the present utility model;
FIG. 4 is an exploded view of FIG. 3;
FIG. 5 is a schematic cross-sectional view of a blower provided in accordance with an embodiment of the utility model;
fig. 6 is a front view of a current collector provided by an embodiment of the present utility model;
fig. 7 is one of the cross-sectional views of a current collector provided in accordance with an embodiment of the present utility model;
FIG. 8 is a schematic illustration of the fit between a current collector and a blade of a wind turbine provided by an embodiment of the present utility model;
fig. 9 is a second cross-sectional view of a current collector provided in an embodiment of the utility model.
In the figure:
1. a wind cabinet;
2. a current collector; 21. a current collecting body; 22. pre-rotation guide vanes; 23. a gas homogenizing net;
3. an impeller; 31. a blade;
4. and a motor.
Detailed Description
The following examples illustrate the utility model, but the utility model is not limited to these examples. Modifications and equivalents of some of the technical features of the specific embodiments of the present utility model may be made without departing from the spirit of the present utility model, and they are all included in the scope of the claimed utility model.
Referring to fig. 1-9, the present utility model provides a current collector installed at an air inlet of a fan of a range hood, wherein the current collector 2 comprises a current collecting body 21, a gas distribution net 23 and a plurality of pre-rotation guide vanes 22. The plurality of pre-rotation guide vanes 22 are arranged on the inner side of the collecting body 21, the first ends of the pre-rotation guide vanes 22 are connected with the collecting body 21, and two adjacent pre-rotation guide vanes 22 are arranged at intervals. The air distribution net 23 is arranged inside the pre-rotation guide vane 22 and is connected with the second end of the pre-rotation guide vane 22. The impeller of the fan and the current collector satisfy the relation: d (D) b -D a1 And is more than or equal to 2W. Wherein D is b Is the inner diameter D of the impeller 3 of the fan a1 For the inside diameter of the pre-rotation guide vane 22, W is the minimum radial clearance requirement between the current collector 2 and the impeller 3 of the fan, so that the minimum radial clearance requirement is met between the current collector 2 and the fan, and meanwhile, the ball close to the impeller 3 of the fan is pre-rotated by arranging the pre-rotation guide vane 22, so that the air inlet smoothness is improved, the air inlet speed of air flow is more uniform, the pneumatic noise is reduced, and the performance of the fan is ensured.
Alternatively, the inlet diameter D of the manifold body 21 a ≥D b The collecting body 21 is positioned outside the end face of the impeller 3, a gap t is formed between the collecting body 21 and the side face of the impeller 3, and the relationship between the impeller and the collector of the fan is also satisfied: t is greater than or equal to t min ，D a1min -D b ≥2t min . Wherein t is min The minimum axial clearance between the collecting body 21 and the impeller 3 is the diameter of the position with the minimum distance between the pre-rotation guide vane 22 and the impeller 3, so that the air flow leakage loss of the fan can be effectively reduced, and the effective acting width of the impeller 3 is not reduced.
Optionally, the distance between the pre-rotation vanes 22 and the end face of the impeller 3 is L.ltoreq.0. L=0 represents that the pre-rotation guide vane 22 is level with the air inlet of the fan, and L < 0 represents that the second end of the pre-rotation guide vane 22 extends into the air inlet of the fan to further reduce the air leakage loss of the air flow in the portion.
Optionally, two adjacent pre-rotation guide vanes 22 are arranged at the same distance, the number of the pre-rotation guide vanes 22 is M, the thickness of the pre-rotation guide vanes 22 is A, the number of blades 31 of an impeller 3 of the fan is N, the thickness of the blades 31 is B, M is more than or equal to 0.5N and less than or equal to 1.5N, A is more than or equal to 0.3B and less than or equal to 10B, and the pre-rotation guide effect on the air flow and the effective passing performance of the air flow are simultaneously considered.
Further, when a takes a large value, N takes a small value.
Optionally, the pre-rotation guide vane 22 is twisted axially to form a first twisted top end and a second twisted top end, the protruding directions of the first twisted top end and the second twisted top end are the same as the rotation direction of the impeller 3, the first twisted top end is an air inlet, the second twisted top end is an air outlet, and the tangent line of the first twisted top end is equal to the air inlet diameter D of the collecting body 21 a The angle between the tangent of the circle being F2, the tangent of the second twisted tip being at an angle D to the inner diameter of the pre-rotation vane 22 a1 The angle between the tangent lines of the round shape is F1, F2E [ 0-90 ]]，F1∈[0-α+25°]F1 is less than or equal to F2. Where α is an air inlet placement angle of the blade 31, and β is an air outlet placement angle of the blade 31. F1 and F2 are radial angles of the pre-rotation guide vane 22 to match the placement angle of the air inlet of the blade 31, so that the inlet air flow is consistent with the rotation direction of the impeller 3 (namely, the direction indicated by an arrow B in fig. 6 and 8), and the resistance of blocking the air flow channel of the impeller 3 due to the flow separation of the suction surface of the impeller 3 caused by the air impact loss of the air inlet of the blade 31 is effectively reduced, thereby solving the problem of the reduction of the performance of the fan to a greater extent.
Optionally, in the axial direction, the first twisted tip of the pre-rotation vane 22 is on the same straight line with the air inlet of the blade 31, in which case, the pre-rotation vane 22 has the best effect of reducing the resistance of blocking the air flow channel of the impeller 3 due to the flow separation of the suction surface of the impeller 3 caused by the air impact loss of the air inlet of the blade 31, and the fan performance can be optimized.
Optionally, the pre-rotation guide vane 22 is orthographically projected in the circumferential direction as a smooth curve composed of one or more of a circular arc line, a bezier curve, and a multi-segment curve, as long as the air flow can be made to flow smoothly.
Specifically, in the present embodiment, the orthographic projection of the pre-rotation guide vane 22 in the circumferential direction is composed of two circular arc lines.
Optionally, the pre-rotation guide vanes 22 are twisted along the axial direction, and the twisting angle is θ, θ e [0 ° -90 ° ], so that air flow narrow-strip channels with specific axial inclination angles are formed between the pre-rotation guide vanes 22 periodically distributed on the inner side of the collector 2 body, and the pre-rotation guide vanes 22 have certain sound insulation and reflection noise reduction effects on the radiation sound field inside the centrifugal fan, and simultaneously can reduce pneumatic noise generated by impact, thereby realizing noise reduction effects. Furthermore, due to the existence of the axial inclination angle theta of the pre-rotation guide vane 22, the area of the current collector 2 projected along the axial direction is increased, the coverage area on one side of the air inlet of the impeller 3 is increased, and the occurrence risk of the surging phenomenon of the air outlet of the fan under high back pressure can be reduced.
Alternatively, as shown in fig. 9, the direction indicated by the arrow C is the airflow direction. The gas distribution net 23 is arranged in a protruding way in the direction opposite to the air flow direction, and the distance between the highest point of the gas distribution net 23 in the axial direction and the collecting body 21 is G 2 The distance between the highest point of the collecting body 21 in the axial direction and the side surface of the collecting body 21 away from the impeller 3 of the fan is G 1 ，0.5D a2 ≥G 2 ≥G 1 . Wherein D is a2 Is the diameter of the gas distribution net 23. The air homogenizing net 23 is arranged in a protruding mode in the direction opposite to the air flow direction, and has a certain sound insulation, reflection and noise reduction effects on the radiation sound field in the centrifugal fan. Meanwhile, the uniformity of the air flow is improved, and then the aerodynamic noise caused by vortex is further reduced.
Optionally, the gas homogenizing net 23 is a honeycomb net, and the cross section of the gas homogenizing net 23 is one or more of parabola, circular arc and Bezier curve. The air homogenizing net 23 is a honeycomb net, and has better sound insulation, reflection and noise reduction effects on the radiation sound field inside the centrifugal fan.
Alternatively, 0.5D b ≤D a2 ≤0.9D b . Wherein D is b With the arrangement, the air distribution net 23 has better air flow guiding effect and air flow passing performance for the inner diameter of the impeller 3 of the fan.
Another aspect of the present utility model provides a fan, including a wind cabinet 1, a wind wheel assembly disposed in the wind cabinet 1 and the above-mentioned current collector 2, where the current collector 2 is mounted on the wind cabinet 1, the wind wheel assembly includes a motor 4 and an impeller 3 drivingly connected to the motor 4, and the impeller 3 includes a plurality of blades 31.
The utility model also provides a range hood, which comprises the fan.
What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.
Claims (13)
1. A current collector installed at an air inlet of a fan of a range hood, the current collector comprising:
a current collecting body (21);
the plurality of pre-rotation guide vanes (22) are arranged on the inner side of the collecting body (21), the first ends of the pre-rotation guide vanes (22) are connected with the collecting body (21), and two adjacent pre-rotation guide vanes (22) are arranged at intervals;
the air homogenizing net (23) is arranged on the inner side of the pre-rotation guide vane (22) and is connected with the second end of the pre-rotation guide vane (22);
the impeller (3) of the fan and the current collector satisfy the relation: d (D) b -D a1 ≥2W；
Wherein D is b Is the inner diameter of an impeller (3) of the fan, D a1 For the inner diameter of the pre-rotation guide vane (22), W is the minimum radial clearance requirement between the collector and the impeller (3).
2. Collector according to claim 1, characterized in that the inlet diameter D of the collector body (21) a ≥D b The flow collecting body (21) is positioned on the outer side of the end face of the impeller (3), a gap t is formed between the flow collecting body (21) and the side face of the impeller (3), and the relationship between the impeller (3) and the flow collector of the fan is also satisfied: t is greater than or equal to t min ，D a1min -D b ≥2t min ；
Wherein t is min For a minimum axial clearance between the collecting body (21) and the impeller (3), D a1min Is the diameter at which the distance between the pre-rotation guide vane (22) and the impeller (3) is minimum.
3. Collector according to claim 2, characterized in that the distance between the pre-rotation guide vane (22) and the end face of the impeller (3) is L, L being equal to or less than 0.
4. The current collector according to claim 1, characterized in that two adjacent pre-rotation guide vanes (22) are arranged at the same distance, the number of the pre-rotation guide vanes (22) is M, the thickness of the pre-rotation guide vanes (22) is A, the number of blades (31) of an impeller (3) of the fan is N, the thickness of the blades (31) is B, and M is more than or equal to 0.5N and less than or equal to 1.5N, and A is more than or equal to 0.3B and less than or equal to 10B.
5. The current collector according to claim 4, wherein the pre-rotation guide vane (22) is twisted axially to form a first twisted tip and a second twisted tip, the protruding direction of the first twisted tip and the second twisted tip is the same as the rotation direction of the impeller (3), the first twisted tip is an air inlet, the second twisted tip is an air outlet, and the tangent line of the first twisted tip is equal to the air inlet diameter D of the current collecting body (21) a The angle between the tangent line of the circle is F2, and the tangent line of the second twisted tip and the inner diameter D of the pre-rotation guide vane a1 The angle between the tangent lines of the round shape is F1, F2E [ 0-90 ]]，F1∈[0-α+25°]，F1≤F2；
Wherein alpha is the air inlet placement angle of the blade (31).
6. Collector according to claim 5, characterized in that the first twisted tip of the pre-rotation vane (22) is axially collinear with the inlet of the blade (31).
7. The current collector of claim 5, wherein the pre-rotation vanes (22) are orthographically projected in a circumferential direction as a smooth curve consisting of one or more of a circular arc, a bezier curve, and a multi-segment curve.
8. The current collector of claim 5, wherein the pre-rotation vanes (22) are axially twisted and have a twist angle θ, θ e [0 ° -90 ° ].
9. The current collector according to any one of claims 1-8, wherein the gas distribution network (23) is arranged to be convex in a direction opposite to the flow direction of the gas flow, and the gas distribution network (23) has a distance G from the current collecting body (21) at the highest point in the axial direction 2 The distance between the highest point of the collecting body (21) in the axial direction and the side surface of the collecting body (21) far away from the impeller (3) of the fan is G 1 ，0.5D a2 ≥G 2 ≥G 1 ；
Wherein D is a2 Is the diameter of the air homogenizing net (23).
10. The current collector according to claim 9, wherein the gas distribution network (23) is a honeycomb network, and the cross section of the gas distribution network (23) is one or more of parabolic, circular arc and bezier curve.
11. The current collector of claim 9, wherein 0.5D b ≤D a2 ≤0.9D b ；
Wherein D is b Is the inner diameter of an impeller (3) of the fan.
12. A fan, characterized by comprising a wind cabinet (1), a wind wheel assembly arranged in the wind cabinet (1) and a current collector (2) according to any one of claims 1-11, wherein the current collector (2) is arranged on the wind cabinet (1), and the wind wheel assembly comprises a motor (4) and an impeller (3) in transmission connection with the motor (4).
13. A range hood comprising the blower of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685473.0U CN220769786U (en) | 2023-06-30 | 2023-06-30 | Current collector, fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685473.0U CN220769786U (en) | 2023-06-30 | 2023-06-30 | Current collector, fan and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220769786U true CN220769786U (en) | 2024-04-12 |
Family
ID=90598324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321685473.0U Active CN220769786U (en) | 2023-06-30 | 2023-06-30 | Current collector, fan and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220769786U (en) |
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2023
- 2023-06-30 CN CN202321685473.0U patent/CN220769786U/en active Active
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