CN219865608U - Centrifugal fan and range hood using same - Google Patents
Centrifugal fan and range hood using same Download PDFInfo
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- CN219865608U CN219865608U CN202320450386.0U CN202320450386U CN219865608U CN 219865608 U CN219865608 U CN 219865608U CN 202320450386 U CN202320450386 U CN 202320450386U CN 219865608 U CN219865608 U CN 219865608U
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- end cover
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- impeller
- guide wall
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- 230000000903 blocking effect Effects 0.000 claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a centrifugal fan and a range hood using the same, wherein the centrifugal fan comprises: a volute; an impeller comprising a front end cap; the current collector comprises an outer ring, wherein the outer ring comprises an annular fixing part used for being fixed with the peripheral edge of an air inlet of the volute and an annular flow guiding part extending from the inner side edge of the annular fixing part towards the inside of the volute; the front end cover of the impeller is inclined inwards to the volute along the axial line of the impeller from the inner periphery to the outer periphery, so that the front end cover is in a horn shape as a whole; the current collector also comprises an inner ring which is positioned at the inner side of the outer ring, the inner ring is provided with a blocking part which protrudes towards the inner side of the volute and is used for blocking the airflow flowing in the volute, the blocking part of the inner ring is provided with a first arc-shaped guide wall which is basically consistent with the bending direction of the front end cover, and a first clearance runner used for slowing down the airflow flowing is formed between the first arc-shaped guide wall and the front end cover. The advantages are that: the first gap flow channel can prevent the back flow air flow from directly flowing out of the gap, so that leakage loss and vibration are reduced.
Description
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan and a range hood using the same.
Background
Centrifugal fans are an important air supply device and are commonly used in products such as range hoods, air conditioners and the like. Centrifugal fans typically include a volute, impeller, motor, and collector. The current collector is used as an important component part of the centrifugal fan and is generally arranged in an air inlet area of the fan, and is used for reducing air inflow loss of the fan and air backflow between the impeller end ring and the volute, improving fan efficiency and reducing working noise. Because there is certain clearance between the impeller inlet and the air inlet ring of centrifugal fan, when the resistance of discharging fume fluctuates to high value, the continuous running of centrifugal fan leads to the quick rising of impeller air intake pressure, and the air current is piled up fast between air inlet ring and impeller front end, induces the vortex, produces noise and vibration problem to cause the performance decline.
In order to solve the above technical problems, for example, chinese patent application No. CN201210230512.8 (grant publication No. CN 102767541B) discloses a noise-reducing collector ring, where the collector ring is disposed at an air inlet of a volute of a range hood, and the collector ring includes an outer ring, the outer ring includes an air guiding surface extending from the air inlet to the inside of the volute and an outer ring fixing surface located at the outer side of the air guiding surface and used for fixing with the volute, and further includes an inner ring located at the inner side of the outer ring, the inner ring includes an isolating surface matched with the air guiding surface and used for blocking turbulence area in the volute and an inner ring fixing surface located at the outer side of the isolating surface and used for fixing with the volute. An inner ring is added on the collector ring, and the collector ring is provided with a separation surface for blocking a turbulence area, so that the formation of the turbulence area in the volute can be blocked, and the air flow in the volute is improved; the through holes or the blind holes are densely distributed on the isolation surface, so that turbulent flow enters the cavity to consume sound energy through multiple reflections or rub and consume sound energy in the blind holes; compared with a collector ring with only one layer of noise reduction structure, the range hood can realize effective noise reduction.
Although the current collector in the above patent has a certain noise reduction effect, there is a certain disadvantage, because the front end plate of the impeller is of a conventional annular flat plate structure, after an inner ring is added on the current collector, a certain gap still exists between the front end plate of the impeller and the inner ring, and the air flow can still flow back to the inlet of the impeller directly through the gap, so that leakage loss exists, and vibration problem is generated. In addition, because the flow direction of the air flow at the inlet of the front end plate of the impeller is changed rapidly, flow separation is easy to generate, so that the axial air flow velocity distribution at the outlet of the impeller is more uneven, secondary flow and a jet flow-wake structure are generated, and the performance is reduced.
Disclosure of Invention
The first technical problem to be solved by the utility model is to provide a centrifugal fan capable of effectively reducing air flow backflow and leakage loss and vibration problems aiming at the current state of the art.
The second technical problem to be solved by the utility model is to provide a range hood applying the centrifugal fan aiming at the current state of the art.
The utility model solves the first technical problem by adopting the technical scheme that: a centrifugal fan, comprising:
the side wall of the volute is provided with an air inlet;
the impeller is rotationally arranged in the volute and comprises a front end cover, a rear end cover and blades which are connected between the front end cover and the rear end cover and distributed along the circumferential direction, and the front end cover is opposite to an air inlet of the volute;
the current collector comprises an outer ring, wherein the outer ring comprises an annular fixing part used for being fixed with the peripheral edge of an air inlet of the volute and an annular flow guiding part extending inwards of the volute from the inner side edge of the annular fixing part;
the front end cover of the impeller is inclined inwards to the volute along the axial line of the impeller from the inner periphery to the outer periphery, so that the front end cover is in a horn shape as a whole;
the current collector also comprises an inner ring positioned at the inner side of the outer ring, the inner ring comprises a first connecting part used for being connected with the annular fixing part of the outer ring and a second connecting part used for being connected with the annular flow guiding part of the outer ring, the inner ring is also provided with a blocking part protruding towards the inside of the volute and used for blocking the airflow flowing in the volute, the blocking part of the inner ring is provided with a first arc-shaped flow guiding wall which is basically consistent with the bending direction of the front end cover, and a first clearance flow channel used for slowing down the airflow is formed between the first arc-shaped flow guiding wall and the front end cover.
As an improvement, the inner periphery of the front end cover is also provided with an annular extension part extending forwards along the axis of the impeller, the annular extension part is positioned outside the end edge of the annular flow guiding part of the outer ring in the radial direction of the impeller, and the annular extension part and the end edge of the annular flow guiding part of the outer ring are at least partially overlapped in the axial direction of the impeller;
the inner ring is provided with a second arc-shaped guide wall connected with the first arc-shaped guide wall at a part adjacent to the second connecting part of the inner ring, the second arc-shaped guide wall is provided with a C-shaped section with an opening facing the inner periphery of the front end cover, and two opposite side edges of the C-shaped opening of the second arc-shaped guide wall are respectively positioned at the inner side and the outer side of the annular extension part of the front end cover, so that a second clearance flow passage communicated with the first clearance flow passage is formed between the second arc-shaped guide wall and the annular extension part of the front end cover.
By adopting the structural design, the first clearance runner and the second clearance runner are communicated to form a bent clearance runner structure, and the existence of the bent clearance runner structure prevents the air flow flowing back from the upper part from directly flowing out of the clearance, so that leakage loss and vibration are further reduced.
In order to avoid vibration caused by abrupt caliber change between the first clearance flow channel and the second clearance flow channel, the first arc-shaped guide wall is smoothly connected with the second arc-shaped guide wall.
In order to make the air flow smoothly sent to the outlet of the volute after being discharged from the impeller radially, the blocking part of the inner ring is also provided with a third guide wall which gradually inclines towards the inside of the volute from the first connecting part to the first arc guide wall.
In order to further improve the noise reduction effect, a noise reduction cavity for filling the sound absorbing piece is further defined between the inner ring and the outer ring, and noise reduction holes communicated with the noise reduction cavity are further distributed on the inner ring.
The design of the noise reduction cavity and the noise reduction hole reduces the noise to be directly transmitted from the front of the fan, and the noise is effectively reduced by absorbing part of the noise through the sound absorbing material.
As an improvement, the outer ring and the inner ring are split pieces and are fixed together through a connecting piece; or the outer ring and the inner ring are integrated.
The utility model solves the second technical problem by adopting the technical proposal that: a range hood comprises a machine body and a centrifugal fan arranged in the machine body, wherein the centrifugal fan adopts the centrifugal fan.
Compared with the prior art, the utility model has the advantages that: the design of the blocking part on the inner ring of the current collector plays a role in blocking the backflow of the air flow, and on the basis, a first clearance flow channel formed between the first arc-shaped guide wall on the blocking part and the horn-shaped front end cover of the impeller prevents the backflow air flow from directly flowing out of the clearance, so that leakage loss and vibration are reduced. On the other hand, the annular flow guide part of the current collector and the cambered surface of the front end cover of the impeller are matched with each other, so that the axially-entering air flow can be gradually guided outwards along the radial direction, the abrupt turning of the air flow is reduced, and the flow separation is reduced. In the preferred scheme, the design of the second arc-shaped guide wall on the inner ring of the current collector further prolongs the length of the gap flow channel at the current collector, and a bent gap flow channel structure is formed after the first gap flow channel is communicated with the second gap flow channel, and the existence of the bent gap flow channel structure further prevents the air flow from flowing back, so that the leakage loss and vibration problem are further improved.
Drawings
FIG. 1 is a schematic perspective view of a centrifugal fan according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a centrifugal fan according to an embodiment of the present utility model in a perspective view at another angle;
FIG. 3 is a cross-sectional view of a centrifugal fan according to an embodiment of the utility model taken along an axial direction thereof;
fig. 4 is a schematic perspective view of the back surface of a current collector according to an embodiment of the present utility model;
fig. 5 is a schematic perspective view of an inner ring of a current collector according to an 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.
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.
Referring to fig. 1-5, a centrifugal fan includes a volute 10, a collector, an impeller 11, and a motor 12. The impeller 11 is disposed inside the volute 10 and can be driven to rotate by the motor 12, and the rotation of the impeller 11 generates negative pressure for sucking the airflow axially and discharging the airflow radially. An air inlet 100 is formed in the front side wall of the volute 10, and the front end part of the impeller 11 is opposite to the air inlet 100 in the volute 10. The above-mentioned collector is installed at the air inlet 100 of the volute 10, and is used for guiding the air flow to smoothly enter the volute 10 through the air inlet 100.
Referring to fig. 3, the impeller 11 includes a front end cover 111, a rear end cover 112, and a plurality of blades 113 connected between the front end cover 111 and the rear end cover 112, each blade 113 being spaced apart along the circumferential direction of the impeller 11. The front cover 111 of the impeller 11 of the present embodiment is gradually inclined toward the inside of the scroll 10 from the inner periphery to the outer periphery thereof, so that the front cover 111 of the impeller 11 is overall horn-shaped.
The current collector includes an outer ring 20 and an inner ring 30 disposed inside the outer ring 20. The outer ring 20 and the inner ring 30 may be separate members, and are fixed together by a connecting member. Of course, the outer ring 20 and the inner ring 30 may be formed as a single piece, such as by welding after the sound absorbing member is installed.
The outer ring 20 adopts a conventional inlet ring structure, which includes an annular fixing portion 21 and an annular flow guiding portion 22 extending from an inner side edge of the annular fixing portion 21 toward the inside of the scroll case 10. The annular fixing portion 21 of the outer ring 20 has an annular flat plate structure extending in the radial direction, and can be fixed after being attached to the peripheral portion of the air inlet 100 of the volute 10. The rear port of the annular deflector 22 of the outer ring 20 protrudes into the interior of the volute 10. Specifically, the inner periphery of the front end cover 111 of the impeller 11 also has an annular extension 1110 extending forward along the axis of the impeller 11, the annular extension 1110 being located outside the rear end edge of the annular deflector 22 of the outer ring 20 in the radial direction of the impeller 11, and the annular extension 1110 at least partially overlapping the annular deflector 22 of the outer ring 20 in the axial direction of the impeller 11.
Referring to fig. 3 and 5, the inner ring 30 includes, in order from outside to inside, a first connection portion 31, a third guide wall 333, a first arc guide wall 331, a second arc guide wall 332, and a second connection portion 32.
The first connecting portion 31 of the inner ring 30 is also an annular flat plate-like structure extending in the radial direction, and can be used to be bonded to the inner side of the annular fixing portion 21 of the outer ring 20. The second connecting portion 32 of the inner ring 30 is an axially extending annular wall structure, and may specifically be attached to the radially outer side of the rear end periphery of the annular flow guiding portion 22 of the outer ring 20. The third guide wall 333 of the inner ring 30 gradually slopes toward the inside of the volute 10 from the first connection portion 31 to the first arc-shaped guide wall 331, and the first arc-shaped guide wall 331 of the inner ring 30 is curved and slopes radially outward toward the outside of the volute 10 from the inside, wherein the curved direction of the first annular guide wall is substantially coincident with the curved direction of the front end cover 111 of the impeller 11, thereby forming a first gap flow path 341 for slowing down the flow of the air flow between the first arc-shaped guide wall 331 and the front end cover 111. The second arc-shaped guide wall 332 of the inner ring 30 is connected between the first arc-shaped guide wall 331 and the second connecting portion 32, the second arc-shaped guide wall 332 has a C-shaped cross section with an opening facing the inner periphery of the front end cover 111, specifically, two opposite sides of the C-shaped opening of the second arc-shaped guide wall 332 are respectively located at the inner side and the outer side of the annular extension 1110 of the front end cover 111, and thus, a second gap flow channel 342 communicating with the first gap flow channel 341 is formed between the second arc-shaped guide wall 332 and the annular extension 1110 of the front end cover 111. The first gap flow channel 341 and the second gap flow channel 342 are communicated to form a curved gap flow channel structure, and the existence of the curved gap flow channel structure further prevents the air flow from flowing back, so that the leakage loss and vibration problem are further improved.
The third guide wall 333, the first arc-shaped guide wall 331 and the second arc-shaped guide wall 332 of the present embodiment together form a blocking portion 33 of the inner ring 30 for blocking the back flow of the air flow. In order to avoid vibration caused by abrupt caliber change between the first clearance flow channel 341 and the second clearance flow channel 342, the first arc-shaped guide wall 331 and the second arc-shaped guide wall 332 are smoothly connected.
The inner ring 30 and the outer ring 20 of the current collector of the present embodiment further define an annular noise reduction cavity 35 therebetween, and the annular noise reduction cavity 35 may be filled with a sound absorbing member (not shown). In addition, noise reduction holes 36 penetrating the noise reduction cavity 35 are also distributed on the blocking portion 33 of the inner ring 30. Preferably, the noise reduction holes 36 are provided on the third guide wall 333 of the inner ring 30. The design of the noise reduction cavity 35 and the noise reduction holes 36 reduces the noise transmitted directly from the front of the fan, and absorbs part of the noise through the sound absorbing material, thereby effectively reducing the noise.
The embodiment also relates to a range hood, which comprises a machine body and a centrifugal fan arranged in the machine body, wherein the centrifugal fan adopted by the range hood is the centrifugal fan.
The blocking portion 33 on the inner ring 30 of the current collector of the present embodiment has the function of blocking the backflow of the air flow, and on this basis, the first gap flow channel 341 formed between the first arc-shaped flow guiding wall 331 on the blocking portion 33 and the horn-shaped front end cover 111 of the impeller 11 prevents the backflow of the air flow from directly flowing out of the gap, so as to reduce the leakage loss and vibration. On the other hand, the annular flow guiding part 22 of the current collector and the cambered surface of the front end cover 111 of the impeller 11 are matched with each other, so that the axially-entering air flow can be gradually guided outwards along the radial direction, the abrupt turning of the air flow is reduced, and the flow separation is reduced. In a preferred embodiment, the design of the second arc-shaped guide wall 332 on the inner ring 30 of the current collector further prolongs the length of the gap flow channel at the current collector, and makes the first gap flow channel 341 and the second gap flow channel 342 form a curved gap flow channel structure after being communicated, and the existence of the curved gap flow channel structure further hinders the backflow of the air flow, so as to further improve the leakage loss and vibration problem.
Claims (7)
1. A centrifugal fan, comprising:
the side wall of the volute (10) is provided with an air inlet (100);
the impeller (11) is rotationally arranged in the volute (10) and comprises a front end cover (111), a rear end cover (112) and blades (113) which are connected between the front end cover (111) and the rear end cover (112) and distributed along the circumferential direction, and the front end cover (111) is opposite to an air inlet (100) of the volute (10);
a current collector comprising an outer ring (20), the outer ring (20) comprising an annular fixing portion (21) for fixing with the periphery of an air inlet (100) of the volute (10) and an annular flow guiding portion (22) extending from the inner side edge of the annular fixing portion (21) towards the inside of the volute (10);
the method is characterized in that: the front end cover (111) of the impeller (11) extends from the inner periphery to the outer periphery of the front end cover to basically extend the axis of the impeller (11) to incline inwards the volute (10), so that the front end cover (111) is in a horn shape as a whole;
the current collector further comprises an inner ring (30) positioned on the inner side of the outer ring (20), the inner ring (30) comprises a first connecting part (31) used for being connected with an annular fixing part (21) of the outer ring (20) and a second connecting part (32) used for being connected with an annular flow guiding part (22) of the outer ring (20), the inner ring (30) is further provided with a blocking part (33) protruding inwards towards the volute (10) and used for blocking airflow at the position, the blocking part (33) of the inner ring (30) is provided with a first arc-shaped flow guiding wall (331) which is basically consistent with the bending direction of the front end cover (111), and a first gap flow channel (341) used for slowing down airflow is formed between the first arc-shaped flow guiding wall (331) and the front end cover (111).
2. The centrifugal fan according to claim 1, wherein: the inner periphery of the front end cover (111) is also provided with an annular extension part (1110) extending forwards along the axis of the impeller (11), the annular extension part (1110) is positioned outside the end edge of the annular flow guiding part (22) of the outer ring (20) in the radial direction of the impeller (11), and at least partial overlap exists between the annular extension part and the end edge in the axial direction of the impeller (11);
the inner ring (30) is provided with a second arc-shaped guide wall (332) connected with the first arc-shaped guide wall (331) at a part adjacent to the second connecting part (32), the second arc-shaped guide wall (332) is provided with a C-shaped section with an opening facing the inner periphery of the front end cover (111), two opposite sides of the C-shaped opening of the second arc-shaped guide wall (332) are respectively positioned on the inner side and the outer side of the annular extension part (1110) of the front end cover (111), and a second clearance runner (342) communicated with the first clearance runner (341) is formed between the second arc-shaped guide wall (332) and the annular extension part (1110) of the front end cover (111).
3. The centrifugal fan according to claim 2, wherein: the first arc-shaped guide wall (331) is smoothly connected with the second arc-shaped guide wall (332).
4. The centrifugal fan according to claim 1, wherein: the blocking portion (33) of the inner ring (30) further has a third guide wall (333) gradually inclined toward the inside of the scroll casing (10) from the first connecting portion (31) to the first arc-shaped guide wall (331).
5. The centrifugal fan according to any one of claims 1-4, wherein: a noise reduction cavity (35) for filling the sound absorbing piece is further defined between the inner ring (30) and the outer ring (20), and noise reduction holes (36) communicated with the noise reduction cavity (35) are further distributed on the inner ring (30).
6. The centrifugal fan according to claim 5, wherein: the outer ring (20) and the inner ring (30) are split pieces and are fixed together through a connecting piece; or the outer ring (20) and the inner ring (30) are integrated.
7. The utility model provides a range hood, includes organism and locates centrifugal fan in the organism, its characterized in that: the centrifugal fan according to any one of claims 1 to 6 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320450386.0U CN219865608U (en) | 2023-03-03 | 2023-03-03 | Centrifugal fan and range hood using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320450386.0U CN219865608U (en) | 2023-03-03 | 2023-03-03 | Centrifugal fan and range hood using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219865608U true CN219865608U (en) | 2023-10-20 |
Family
ID=88338369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320450386.0U Active CN219865608U (en) | 2023-03-03 | 2023-03-03 | Centrifugal fan and range hood using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219865608U (en) |
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2023
- 2023-03-03 CN CN202320450386.0U patent/CN219865608U/en active Active
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