CN220956165U - Volute for range hood, fan system and range hood - Google Patents
Volute for range hood, fan system and range hood Download PDFInfo
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- CN220956165U CN220956165U CN202322642417.5U CN202322642417U CN220956165U CN 220956165 U CN220956165 U CN 220956165U CN 202322642417 U CN202322642417 U CN 202322642417U CN 220956165 U CN220956165 U CN 220956165U
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- 238000000034 method Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010411 cooking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
A spiral case, fan system and range hood for range hood, the spiral case includes: the shell is provided with a front cover plate, a rear cover plate and a ring wall connected between the front cover plate and the rear cover plate, wherein two ends of the ring wall in the circumferential direction and corresponding parts of the front cover plate and the rear cover plate jointly define an air outlet with an upward opening at the top of the shell; the front cover plate and/or the rear cover plate are/is provided with an air inlet; the position relatively close to the front cover plate or/and the rear cover plate in the shell is provided with a flow guide strip, the flow guide strip extends along the circumferential direction of the annular wall, the outer circumferential surface of the flow guide strip is attached to the annular wall, and at least two grooves are formed in the inner circumferential surface of the flow guide strip at intervals along the circumferential direction. Compared with the prior art, the utility model can reduce the noise of the air flow.
Description
Technical Field
The utility model belongs to the technical field of kitchen appliances, and particularly relates to a volute casing for a range hood, a fan system and the range hood.
Background
The kitchen appliance mainly drives air flow through a fan, quickly pumps away the oil smoke generated in the cooking process and discharges the oil smoke outdoors, thereby purifying the kitchen environment. The fan system in the existing range hood generally adopts a centrifugal fan, a volute of the centrifugal fan mainly comprises a ring wall, a front cover plate and a rear cover plate, airflow flows along the volute molded line, and energy is continuously collected to convert kinetic energy into static pressure energy.
When the range hood operates, the air flow generated by rotation of the impeller in the fan system is uneven, and the structure of the single volute molded line design of the internal air channel cannot buffer surrounding air flow, so that the air flow forms a vortex at the volute opening, larger air flow noise is generated, and the cooking experience of a user is influenced.
For this reason, the utility model patent of application number CN202020498301.2 (issued to the public number CN 211822614U) discloses a fan volute structure, including a coaming, the coaming has at least two deflector parts, each deflector part is connected in turn along the direction of diversion of the coaming; a step part is arranged between any two adjacent guide plate parts, a first side of the step part is connected with the guide plate part deviating from the air outlet of the fan volute, a second side of the step part is connected with the guide plate part close to the air outlet of the fan volute, and the distance between the first side of the step part and the center of the fan volute is smaller than the distance between the second side of the step part and the center of the fan volute.
The step portion of the above patent can reduce the viscous effect of the air flow due to abrupt cross section change and suddenly reduce the air pressure to guide the air flow to flow towards the outlet direction of the volute, but the volute line which is continuously expanded outwards can influence the increase of the size of the volute, the vortex generated at the step portion can not be restrained, and the step effect is influenced. And the asymmetry of the fluid in the axial direction is not considered, the step of the main flow area (generally, the volute area corresponding to the main acting area of the rear section in the fan impeller) can worsen the flow.
Meanwhile, the airflow can flow along the extension direction of the molded line, namely the circumferential direction, and can also float in the axial direction in the volute, and the boundary between the annular wall of the volute and the front cover plate and the vertical surface of the front cover plate and the rear cover plate are used as the horizontal surface, so that obvious flow separation phenomenon exists at the boundary, and airflow noise is generated.
Disclosure of utility model
The first technical problem to be solved by the present utility model is to provide a volute for a range hood to reduce airflow noise.
The second technical problem to be solved by the utility model is to provide a fan system with the volute.
The third technical problem to be solved by the utility model is to provide the range hood with the fan system.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: a volute for a range hood, comprising:
The shell is provided with a front cover plate, a rear cover plate and a ring wall connected between the front cover plate and the rear cover plate, wherein two ends of the ring wall in the circumferential direction and corresponding parts of the front cover plate and the rear cover plate jointly define an air outlet with an upward opening at the top of the shell; the front cover plate and/or the rear cover plate are/is provided with an air inlet;
The method is characterized in that:
The position relatively close to the front cover plate or/and the rear cover plate in the shell is provided with a flow guide strip, the flow guide strip extends along the circumferential direction of the annular wall, the outer circumferential surface of the flow guide strip is attached to the annular wall, and at least two grooves are formed in the inner circumferential surface of the flow guide strip at intervals along the circumferential direction.
According to the utility model, the guide strips are arranged at positions relatively close to the front cover plate or/and the rear cover plate, and can nest the vortex near the junction wall surface area of the corresponding cover plate and the annular wall at the inner peripheral surface of the guide strips, so that the vortex is prevented from influencing the main flow area, and therefore, the flow separation and the fan noise are reduced.
Preferably, each groove extends along the circumferential direction of the guide strip and penetrates through the front end face and the rear end face of the guide strip.
Preferably, the two ends of the annular wall are a first end and a second end, a volute tongue is formed at the first end of the annular wall, and the extending length of each groove gradually increases along the extending direction from the first end to the second end of the annular wall.
Preferably, a convex portion is formed between two adjacent grooves in the circumferential direction, and the extending length of each convex portion in the circumferential direction gradually increases along the extending direction from the first end portion to the second end portion of the annular wall.
Further, the extension length of the convex portion in the circumferential direction along the extending direction from the first end portion to the second end portion of the annular wall is larger than the extension length of the groove adjacent thereto and located upstream thereof, and smaller than the extension length of the groove adjacent thereto and located downstream thereof.
Further, the central angle corresponding to the convex part is theta i, the central angle corresponding to the groove adjacent to the convex part and positioned at the downstream of the convex part is theta i+1, and the two conditions are satisfied: θ i+1/θi =1.1 to 2.5.
Preferably, a step is formed between adjacent convex parts and grooves, the step is provided with a first arc-shaped surface corresponding to the grooves and extending circumferentially, a second arc-shaped surface corresponding to the convex parts and extending circumferentially, and a joint surface connecting the first arc-shaped surface and the second arc-shaped surface and extending radially, the length of the joint surface in the radial direction is denoted as w, the width of the joint surface in the front-rear direction of the guide strip is denoted as b, and the two conditions are satisfied: w/b=0.2 to 0.8.
Preferably, the flow guide strips are at least two, and each flow guide strip is respectively attached to the corresponding front cover plate and rear cover plate.
Further, the connection surface of the guide strip positioned at the rear side part of the shell is in a shape with large rear end length and small front end length, and the ratio of the front end length to the rear end length is 0.1-0.5;
The connecting surface of the guide strip positioned at the front side part of the shell is in a shape with large front end length and small rear end length, and the ratio of the rear end length to the front end length is 0.1-0.5.
Further, the length of each engagement surface in the radial direction is gradually reduced along the extending direction from the first end to the second end of the annular wall.
The utility model solves the second technical problem by adopting the technical proposal that: a fan system having a volute as described above, characterized by: the motor is arranged on a rear cover plate of the shell, and an output shaft of the motor is connected with the impeller and used for driving the impeller to rotate.
Preferably, the flow guide strips are at least two, and each flow guide strip is respectively attached to the corresponding front cover plate and rear cover plate;
The front end face of the impeller is opposite to the front cover plate of the shell at intervals, and the interval distance between the front end face of the impeller and the front cover plate is e1; note that the width in the front-rear direction of the guide strip located at the front side of the housing is b1, and both satisfy: b1/e1=0.5 to 1.5;
The rear end face of the impeller is opposite to the rear cover plate of the shell at intervals, and the interval distance between the rear end face of the impeller and the rear cover plate is denoted as e2; note that the width in the front-rear direction of the guide strip located at the rear side of the housing is b2, and both satisfy: b2/e2=0.5 to 1.5.
The clearance between the front cover plate and the rear cover plate of the volute and the corresponding impeller end surface can enable the airflow to flow back to the impeller air inlet after the impeller does work, so that the efficiency of the fan is reduced, the flow separation at the wall surface can further aggravate the backflow, and the flow separation at the junction of the wall surfaces can be controlled by the design of the flow guide strip in the utility model, so that the backflow problem can be improved.
Because the air inlet quantity of the front cover plate and the air inlet quantity of the rear cover plate of the volute are inconsistent, and the airflow can have more flow separation phenomena due to the existence of accessories such as a motor bracket, a motor and the like at the rear cover, more vortexes are caused, and considering the air inlet asymmetry, preferably, b2=kb 1 and k=1.2-2.
The technical scheme adopted by the utility model for solving the third technical problem is as follows: a range hood, characterized by having a fan system as described above.
Compared with the prior art, the utility model has the advantages that: through setting up the guide bar of circumference extension in the position of relative being close to front shroud or/and back shroud in the casing, be equipped with two at least recesses along circumference interval on the inner peripheral surface of guide bar, so, the guide bar can be with the corresponding apron and the adjacent vortex nest of rampart interface wall area in its inner peripheral surface department, avoid vortex to influence the mainstream region to reduce the flow separation and reduce fan noise.
Drawings
Fig. 1 is a schematic view of a partial structure of a range hood according to an embodiment of the present utility model;
FIG. 2 is a cross-sectional view of FIG. 1 (cross-section taken along a vertical plane extending from side to side);
FIG. 3 is a cross-sectional view of FIG. 1 (with the cross-section being a vertical plane extending back and forth);
FIG. 4 is a schematic diagram of a flow guiding strip according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of the flow guide strip according to another embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 to 5, a preferred embodiment of the present utility model is a scroll casing for a range hood, a fan system including the scroll casing, an impeller 3, and a motor 4, and a range hood.
The volute comprises a shell 1 and a flow guiding strip 2.
The casing 1 has a front cover plate 11, a rear cover plate 12 and a ring wall 13 connected between the front cover plate 11 and the rear cover plate 12, wherein two ends of the ring wall 13 in the circumferential direction are respectively marked as a first end 131 and a second end 132, a volute tongue 133 is formed at the first end 131 of the ring wall 13, and the two ends of the ring wall 13 and the corresponding parts of the front cover plate 11 and the rear cover plate 12 together define an air outlet 1b with an upward opening at the top of the casing 1; the front cover plate 11 is provided with an air inlet 1a.
The impeller 3 is rotatably provided in the casing 1 around a central axis extending in the front-rear direction thereof, and the front end surface of the impeller 3 is spaced apart from the front cover plate 11 of the casing 1 by a distance e1; the rear end surface of the impeller 3 is spaced apart from the rear cover plate 12 of the casing 1 by a distance e2. The motor 4 is arranged on the rear cover plate 12 of the shell 1, and an output shaft of the motor 4 is connected with the impeller 3 and is used for driving the impeller 3 to rotate.
The guide strip 2 is arc extending along the circumferential direction of the annular wall 13, and is arranged in the shell 1, and the outer circumferential surface of the guide strip 2 is attached to the annular wall 13. In this embodiment, two guide strips 2 are arranged at intervals, and are respectively attached to the front cover plate 11 and the rear cover plate 12. At least two grooves 21 are formed in the inner peripheral surface of each guide strip 2 at intervals along the circumferential direction, and each groove 21 extends along the circumferential direction of the guide strip 2 and penetrates through the front end surface and the rear end surface of the guide strip 2. A convex portion 22 is formed between two adjacent grooves 21 in the circumferential direction. And along the extending direction of the first end 131 to the second end 132 of the annular wall 13, the extending length of each groove 21 in the circumferential direction is gradually increased, the extending length of each convex portion 22 in the circumferential direction is gradually increased, and the extending length of the convex portion 22 in the circumferential direction is larger than the extending length of the groove 21 adjacent thereto and located upstream thereof, and is smaller than the extending length of the groove 21 adjacent thereto and located downstream thereof. In this embodiment, the central angle corresponding to the convex portion 22 is θ i, the central angle corresponding to the groove 21 adjacent to the convex portion 22 and located downstream of the convex portion 22 is θ i+1, and the two conditions are satisfied: θ i+1/θi =1.1 to 2.5 (may be any value between 1.1 and 2.5, such as 1.1, 2, 2.5, etc.), please refer to fig. 4.
Meanwhile, as shown in fig. 5, a step is formed between the adjacent convex portion 22 and the groove 21, the step has a first arc surface 211 corresponding to the groove 21 and extending circumferentially, a second arc surface 221 corresponding to the convex portion 22 and extending circumferentially, and a joining surface 23 joining the first arc surface 211 and the second arc surface 221 and extending radially, the length of the joining surface 23 in the radial direction is w, and the width of the joining surface 23 in the front-rear direction of the flow guiding strip 2 is b (b=10mm in the present embodiment), and the two satisfy: w/b=0.2 to 0.8 (may be any value between 0.2 and 0.8, such as 0.2, 0.5, 0.8, etc.). The length w of the joint surface 23 can be consistent in the front-rear direction, but considering the non-uniformity of the axial flow, the separation near the cover plate is serious, and a deeper step is needed to nest the vortex, so that the joint surface 23 of the flow guide strip 2 positioned at the rear side part of the shell 1 in the embodiment takes the shape of large rear end length and small front end length, and the ratio of the front end length w2 to the rear end length w1 is 0.1-0.5 (can be any value between 0.1-0.5, such as 0.1, 0.2, 0.5, and the like); the engagement surface 23 of the guide strip 2 at the front side of the housing 1 has a shape with a large front end length and a small rear end length, and the ratio of the rear end length to the front end length is 0.1 to 0.5 (may be any value between 0.1 and 0.5, such as 0.1, 0.2, 0.3, 0.5, etc.). Further, in view of the non-uniformity of the circumferential air flow separation, the air flow separation is generally serious at the volute tongue, and thus the step at the volute tongue needs to be deeper, that is, the length of each engagement surface 23 in the radial direction gradually decreases along the extending direction of the first end 131 to the second end 132 of the annular wall 13. The length of the engagement surface 23 of two adjacent steps in the circumferential direction is noted as wj, wj+1/wj=0.65 to 0.95 (may be any value between 0.65 and 0.95, such as 0.65, 0.8, 0.95, etc.). Wherein, along the extending direction from the first end 131 to the second end 132 of the annular wall 13, the step corresponding to wj+1 is located downstream of the step corresponding to wj.
Meanwhile, gaps between the front cover plate and the rear cover plate of the volute and the corresponding end faces of the impeller can enable airflow to flow back to an air inlet of the impeller after the impeller does work, so that the efficiency of the fan is reduced, flow separation at the wall surface can further aggravate backflow, and the flow separation at the junction of the wall surfaces can be controlled by the design of the flow guide strip in the utility model, so that the backflow problem can be improved. And the width of the guide strip 2 positioned at the front side part of the shell 1 in the front-rear direction is b1, and b 1/e1=0.5-1.5; the width of the guide strip 2 located at the rear side of the housing 1 in the front-rear direction is b2, b 2/e2=0.5 to 1.5. Further, because the air inlet amounts of the front cover plate and the rear cover plate of the volute are inconsistent, and the airflow can flow and separate more due to the existence of accessories such as a motor bracket and a motor at the rear cover, the vortex is more, and the air inlet asymmetry is considered, preferably, b2=kb 1, k is a width proportionality coefficient, and is related to the distribution of the air inlet amount Qi at two sides of the volute, and k=1.2-2. Please refer to fig. 3 in detail.
The range hood of this embodiment has the fan system and the existing fume collecting hood and fan cover, and the positional relationship of the three is designed with reference to the prior art, and will not be described here. When the fan system of the embodiment works, the noise is reduced by 0.5-0.6dB compared with a prototype (the existing model without the diversion strips).
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.
The term "radial" is also used in the present description and claims to mean substantially in an inward-outward direction, not limited to a radial direction only through the center of a circle, but also slightly offset from the radial direction.
Claims (14)
1. A volute for a range hood, comprising:
The shell (1) is provided with a front cover plate (11), a rear cover plate (12) and a ring wall (13) connected between the front cover plate (11) and the rear cover plate (12), wherein two ends of the ring wall (13) in the circumferential direction and corresponding parts of the front cover plate (11) and the rear cover plate (12) jointly define an air outlet (1 b) with an upward opening at the top of the shell (1); an air inlet (1 a) is formed in the front cover plate (11) and/or the rear cover plate (12);
The method is characterized in that:
The novel air conditioner is characterized in that a guide strip (2) is arranged at a position, which is relatively close to the front cover plate (11) or the rear cover plate (12), of the shell (1), the guide strip (2) extends along the circumferential direction of the annular wall (13), the outer circumferential surface of the guide strip (2) is attached to the annular wall (13), and at least two grooves (21) are formed in the inner circumferential surface of the guide strip (2) at intervals along the circumferential direction.
2. The volute of claim 1, wherein: each groove (21) extends along the circumferential direction of the guide strip (2) and penetrates through the front end face and the rear end face of the guide strip (2).
3. The volute of claim 2, wherein: the two ends of the annular wall (13) are a first end (131) and a second end (132), a volute tongue (133) is formed at the first end (131) of the annular wall (13), and the extending length of each groove (21) is gradually increased along the extending direction from the first end (131) to the second end (132) of the annular wall (13).
4. A volute according to claim 3, wherein: a convex portion (22) is formed between two adjacent grooves (21) in the circumferential direction, and the extending length of each convex portion (22) in the circumferential direction gradually increases along the extending direction from the first end portion (131) to the second end portion (132) of the annular wall (13).
5. The volute of claim 4, wherein: along the extending direction from the first end (131) to the second end (132) of the annular wall (13), the extending length of the convex portion (22) in the circumferential direction is longer than the extending length of the groove (21) adjacent thereto and located upstream thereof, and is shorter than the extending length of the groove (21) adjacent thereto and located downstream thereof.
6. The volute of claim 5, wherein: the central angle corresponding to the convex part (22) is theta i, the central angle corresponding to the groove (21) adjacent to the convex part (22) and positioned at the downstream of the convex part (22) is theta i+1, and the two conditions are satisfied: θ i+1/θi =1.1 to 2.5.
7. The volute of claim 4, wherein: a step is formed between the adjacent convex part (22) and the groove (21), the step is provided with a first arc-shaped surface (211) corresponding to the groove (21) and extending circumferentially, a second arc-shaped surface (221) corresponding to the convex part (22) and extending circumferentially, and a connecting surface (23) connecting the first arc-shaped surface (211) with the second arc-shaped surface (221) and extending radially, the length of the connecting surface (23) in the radial direction is denoted as w, the width of the connecting surface (23) in the front-rear direction of the guide strip (2) is denoted as b, and the two conditions are satisfied: w/b=0.2 to 0.8.
8. The volute of claim 7, wherein: the air guide strips (2) are at least two, and each air guide strip (2) is respectively attached to the corresponding front cover plate (11) and rear cover plate (12).
9. The volute of claim 8, wherein: the joint surface (23) of the flow guide strip (2) positioned at the rear side part of the shell (1) is in a shape with large rear end length and small front end length, and the ratio of the front end length to the rear end length is 0.1-0.5;
The connection surface (23) of the flow guiding strip (2) positioned at the front side part of the shell (1) is in a shape with large front end length and small rear end length, and the ratio of the rear end length to the front end length is 0.1-0.5.
10. The volute of claim 7, wherein: the length of each engagement surface (23) in the radial direction is gradually reduced along the extending direction from the first end (131) to the second end (132) of the annular wall (13).
11. A fan system having a volute according to any one of claims 1 to 10, wherein: the device also comprises an impeller (3) and a motor (4), wherein the impeller (3) is arranged in the shell (1) in a manner of rotating around a central axis extending forwards and backwards, the motor (4) is arranged on the rear cover plate (12) of the shell (1), and an output shaft of the motor (4) is connected with the impeller (3) and used for driving the impeller (3) to rotate.
12. The blower system of claim 11, wherein: at least two guide strips (2), wherein each guide strip (2) is respectively attached to a corresponding front cover plate (11) and a corresponding rear cover plate (12);
The front end face of the impeller (3) is opposite to the front cover plate (11) of the shell (1) at intervals, and the interval distance between the front end face and the front cover plate is e1; the width of the guide strip (2) positioned at the front side part of the shell (1) in the front-back direction is b1, and the width satisfy the following conditions: b1/e1=0.5 to 1.5;
The rear end face of the impeller (3) is opposite to the rear cover plate (12) of the shell (1) at intervals, and the interval distance between the rear end face and the rear cover plate is denoted as e2; the width of the guide strip (2) positioned at the rear side part of the shell (1) in the front-rear direction is b2, and the width satisfy the following conditions: b2/e2=0.5 to 1.5.
13. The blower system of claim 12, wherein: b2 K b1, and k=1.2 to 2.
14. A range hood having a fan system as claimed in any one of claims 11 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322642417.5U CN220956165U (en) | 2023-09-27 | 2023-09-27 | Volute for range hood, fan system and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322642417.5U CN220956165U (en) | 2023-09-27 | 2023-09-27 | Volute for range hood, fan system and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220956165U true CN220956165U (en) | 2024-05-14 |
Family
ID=90980538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322642417.5U Active CN220956165U (en) | 2023-09-27 | 2023-09-27 | Volute for range hood, fan system and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220956165U (en) |
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2023
- 2023-09-27 CN CN202322642417.5U patent/CN220956165U/en active Active
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