CN217270999U - Impeller, fan system applying impeller and range hood - Google Patents
Impeller, fan system applying impeller and range hood Download PDFInfo
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- CN217270999U CN217270999U CN202220766966.6U CN202220766966U CN217270999U CN 217270999 U CN217270999 U CN 217270999U CN 202220766966 U CN202220766966 U CN 202220766966U CN 217270999 U CN217270999 U CN 217270999U
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Abstract
The utility model discloses an impeller, applied fan system and range hood that has this impeller, the impeller includes the rim plate and installs the first blade on the rim plate, first blade is provided with the second blade along the circumference interval arrangement of rim plate in the blade way that forms between two adjacent first blades, uses adjacent m second blade as a set of along circumference, and every group is as a cycle, contained angle between the pressure surface entry of first blade and the pressure surface entry of adjacent second blade is periodic variation. Compared with the prior art, the utility model has the advantages of: the included angle between the second blade and the pressure surface inlet of the first blade is changed periodically, so that the small outlet trails which are controllable periodically are formed after the airflow flows out of the small channels between the first blade and the second blade, and the small outlet trails of the adjacent blade channels influence each other periodically due to different angles after flowing out of the impeller, and secondary flow of the airflow in the volute after the impeller flows out can be reduced.
Description
Technical Field
The utility model relates to a power device, especially an impeller uses the fan system who has this impeller to and use the range hood that has this fan system.
Background
The multi-wing centrifugal fan has the characteristics of high pressure, low noise and the like, so that a multi-wing centrifugal fan system is generally used as a power source in the society at present, and two functions of acting and filtering are completed in a volute by utilizing an impeller rotating at a high speed. When the impeller rotates, negative pressure suction is generated in the center of the fan to suck the oil smoke below the range hood into the fan, and the oil smoke is accelerated by the fan and then is collected by the volute and guided to be discharged out of the room.
The existing range hood, its power plant generally adopts the multi-wing centrifugal fan, the blade 100 of the impeller of the fan mainly adopts the single circular arc blade, refer to fig. 6 and fig. 7, on the one hand, the circumferential different positions admit air the state differently, it is easy to produce the big local backward flow (as the area that the arrow encloses in fig. 7) because of the negative pressure difference to be close to the suction surface (acting back) of the blade of inlet side, can make efficiency reduce and increase the noise at the same time, on the other hand, there is great friction to the air current along the length direction blade outward, make the gas flow unsmooth, still can lean on the boundary layer separation of suction surface together, produce the secondary vortex, can reduce efficiency too, increase the noise.
For this reason, the prior application (application number 201520081238.1) of this application discloses a centrifugal fan impeller, including the rim plate and install the blade on the rim plate, the blade include wide blade and narrow blade, form the blade way between the two adjacent wide blades, narrow blade locate in the blade way, the air inlet department of blade way is located to narrow blade.
The setting mode of the blade can effectively reduce the airflow vortex of the blade channel, thereby effectively reducing the blockage at the inlet of the blade channel and reducing the expansion angle of the blade channel, reducing the noise of the fan and reducing the pressure and flow loss, namely reducing the aerodynamic noise of the fan as far as possible on the premise of not losing the aerodynamic performance of the fan as far as possible.
However, because the small outlet wake angle formed after the airflow flows out of the small blade channel between the narrow blade and the wide blade is the same, secondary flow is easily formed in the volute after the airflow flows out of the impeller, and certain aerodynamic loss and aerodynamic noise still exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art existence, provides an impeller, reduces the formation that the air current secondary flows behind the outflow impeller.
The utility model discloses the second technical problem that will solve provides an use fan system who has above-mentioned impeller.
The utility model aims to solve the third technical problem that a use range hood that has above-mentioned fan system is provided.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides an impeller, includes the rim plate and installs the first blade on the rim plate, first blade is provided with second blade, its characterized in that along the circumference interval arrangement of rim plate in the blade way that forms between two adjacent first blades: and m adjacent second blades are arranged in a group along the circumferential direction, each group is used as a period, and the included angle between the pressure surface inlet of the first blade and the pressure surface inlet of the adjacent second blade is periodically changed.
Preferably, to ensure the number of cycles, the number of the first blades is Z, and m ∈ [2, Z/2] is satisfied.
Specifically, the change law follows that, in each period, the change law of the included angle satisfies:
A i′ is the included angle between the pressure surface inlet of the first blade and the pressure surface inlet of the adjacent second blade in each period, i 'is the serial number of the second blades in each period along the circumferential direction, i' belongs to [1, m ]]，A 0 Characterizing a reference angle between the pressure side inlet of the second blade and the pressure side inlet of the first blade, and satisfying
K is a scaling coefficient and satisfies K epsilon [0.1, 2 ∈ ]]，
In order to be a periodic angle variable,
is an initial period angle, and satisfies
Preferably, the first blade and the second blade are both arc blades.
Preferably, for the production that reduces big swirl, improve flow efficiency, reduce energy loss and the noise that big swirl caused, avoid extra frictional loss between the blade way, and then lifting efficiency reduces the noise, the second blade sets up the air inlet position near the blade way.
Preferably, in order to further reduce the generation of large vortexes, improve the flow efficiency, reduce the energy loss and noise caused by the large vortexes, avoid additional friction loss between blade paths, and further improve the efficiency and reduce the noise, the wrap angle AOC of the first blade belongs to [30 degrees, 150 degrees ], wherein O is the center of a first blade profile, a is the profile starting point of the first blade, and C is the profile end point of the first blade; the first blade and the second blade are concentrically arranged, and the wrap angle of the second blade is equal to EOF: the angle AOC belongs to [0.1,0.35], wherein E is a molded line starting point of the second blade, F is a molded line terminal point of the second blade, and the angle AOE is satisfied: the angle AOC belongs to [0,0.35 ].
The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a fan system, its characterized in that: an impeller as described above is applied.
The utility model provides a technical scheme that above-mentioned third technical problem adopted does: a range hood, its characterized in that: a fan system as described above is applied.
Compared with the prior art, the utility model has the advantages of: the included angle between the second blade and the inlet of the pressure surface of the first blade is changed periodically, so that the small outlet trails which are controllable periodically are formed after the airflow flows out of the small channels between the first blade and the second blade, and the small outlet trails of the adjacent blade channels are different in angle, and the secondary flow of the airflow in the volute after the airflow flows out of the impeller can be reduced due to the periodic mutual influence after the airflow flows out of the impeller.
Drawings
Fig. 1 is a schematic view of an impeller according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion I of FIG. 1;
fig. 3 is a schematic profile view of a blade of an impeller according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a change of an included angle a between inlets of pressure surfaces of two blades of an impeller according to an embodiment of the present invention;
fig. 5 is a schematic view of the blade path of an impeller according to an embodiment of the present invention;
FIG. 6 is a schematic view of a prior art impeller;
fig. 7 is a schematic view of the vane path of a prior art impeller.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are intended to be illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 to 5, an impeller is used for a fan system, and the fan system is a multi-blade centrifugal fan, and can be mainly used for a range hood and can also be used in other occasions requiring similar power devices.
The impeller comprises two wheel discs 3 (only one is shown in fig. 1, the same as the prior art) and first blades 1 mounted on the wheel discs 3, the first blades 1 are arranged between the two wheel discs 3 at intervals along the circumferential direction of the wheel discs 3, and the airflow enters from an inlet 11 of the first blade 1, flows along a blade path Q between two adjacent first blades 1 and flows out from an outlet 12 of the first blade 1. The first blade 1 is preferably a circular arc blade.
The impeller further comprises a second blade 2 arranged in the blade channel Q between two first blades 1, the second blade 2 also being a circular blade, having a smaller length than the first blades 1, and being arranged close to the inlet of the blade channel Q (close to the inlet 11 of the first blades 1), so as to form a composite structure and a channel. In this way, on one hand, the airflow flows through the vicinity of the suction surface (back surface) of the first blade 1 near the inlet 11, and the dredging effect of the second blade 2 is not easy to separate, so that the generation of large vortex is reduced, the flow efficiency is improved, and the energy loss and noise caused by the large vortex are reduced, as shown in fig. 5, the arrow indicates the airflow flowing direction; on the other hand utilizes the existence and the rotation of second blade 2, provides the further reduction swirl grow of local pressure face, and second blade 2's length is less than first blade 1 simultaneously a lot of, avoids extra frictional loss between the blade way, and then raises the efficiency and reduces the noise.
The wrap angle of the first blade 1 is AOC ∈ [30 degrees and 150 degrees ], wherein O is the center of the molded line of the first blade 1, A is the molded line starting point (corresponding to the inlet 11) of the first blade 1, and C is the molded line end point (corresponding to the outlet 12) of the first blade 1. Wrap angle ≈ EOF of the second blade 2: the angle AOC belongs to [0.1,0.35], and the first blade 1 and the second blade 2 are concentrically arranged, wherein E is a molded line starting point of the second blade 2, and F is a molded line terminal point of the second blade 2. And the condition of approaching to a nearby position angle of AOE is met: the angle AOC belongs to [0,0.35 ].
The included angle between the pressure surface inlet of the first blade 1 and the pressure surface inlet of the adjacent second blade 2 is A i And i are serial numbers of the second blades 2 in order in the circumferential direction. Along the circumferential direction (clockwise or counterclockwise as viewed in FIG. 1), A i The position with the central angle of 0 can be the rightmost side in the horizontal direction of the figure. Specifically, let the number of first blades 1 be Z, and satisfy Z ∈ [30, 120]Characterizing the total number of first blades 1. M are taken as a group and satisfy m epsilon [2, Z/2]The number of second blades 2 that varies within the cycle is characterized. As shown in fig. 1, m is 5.
There is thus a blade period variation of Z/m periods,
characterizing the reference angle between the pressure side entrance of the second blade 2 and the pressure side entrance of the first blade 1. Within each cycle, the included angle A i′ The change rule of (2) follows:
where i 'is the number of the second blade 2 in each period in the circumferential direction, i' is e [1, m ]]，K∈[0.1，2]To scale the coefficients, which may be empirically or experimentally determined,
in order to be the initial angle of the period,
because the space between the pressure surface inlet of the second blade 2 and the pressure surface inlet of the first blade 1 is increasedIncluded angle A of i The periodic variation of the first vane and the second vane can make the airflow form a periodically controllable small outlet wake after flowing out of the small channel between the first vane 1 and the second vane 2, and the small outlet trails of the adjacent vane channels have different angles, and the periodic mutual influence can reduce the secondary flow of the airflow in the volute after flowing out of the impeller.
Claims (8)
1. The utility model provides an impeller, includes rim plate (3) and installs first blade (1) on rim plate (3), first blade (1) are provided with second blade (2), its characterized in that along the circumference interval arrangement of rim plate (3) in the blade way (Q) that form between two adjacent first blade (1): and m adjacent second blades (2) are arranged in a group along the circumferential direction, each group is used as a period, and the included angle between the pressure surface inlet of the first blade (1) and the pressure surface inlet of the adjacent second blade (2) is periodically changed.
2. The impeller of claim 1, wherein: the number of the first blades (1) is Z and m epsilon [2, Z/2] is satisfied.
3. The impeller of claim 2, wherein: in each period, the change rule of the included angle meets the following conditions:
A i′ the included angle between the pressure surface inlet of the first blade (1) and the pressure surface inlet of the adjacent second blade (2) in each period is defined as i ', the numbers of the second blades (2) in each period are sequentially arranged along the circumferential direction, i' belongs to [1, m ∈ ]]，A 0 Characterizing a reference angle between the pressure side inlet of the second blade (2) and the pressure side inlet of the first blade (1) and satisfying
K is a scaling factor and satisfies K epsilon [0.1, 2 ∈]，
In order to be a periodic angle variable,
is an initial period angle, and satisfies
4. An impeller according to any one of claims 1 to 3, wherein: the first blade (1) and the second blade (2) are both arc blades.
5. The impeller of claim 4, wherein: the second blade (2) is arranged at a position close to the air inlet of the blade channel (Q).
6. The impeller of claim 5, wherein: the wrap angle of the first blade (1) is AOC which belongs to [30 degrees and 150 degrees ], wherein O is the circle center of the molded line of the first blade (1), A is the molded line starting point of the first blade (1), and C is the molded line terminal point of the first blade (1); the first blade (1) and the second blade (2) are concentrically arranged, and the wrap angle of the second blade (2) is equal to EOF: the angle AOC belongs to [0.1,0.35], wherein E is the molded line starting point of the second blade (2), F is the molded line terminal point of the second blade (2), and the angle AOE is satisfied: the angle AOC belongs to [0,0.35 ].
7. A fan system, its characterized in that: use of an impeller according to any one of claims 1 to 6.
8. A range hood, its characterized in that: use of a fan system according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220766966.6U CN217270999U (en) | 2022-03-31 | 2022-03-31 | Impeller, fan system applying impeller and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220766966.6U CN217270999U (en) | 2022-03-31 | 2022-03-31 | Impeller, fan system applying impeller and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217270999U true CN217270999U (en) | 2022-08-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220766966.6U Active CN217270999U (en) | 2022-03-31 | 2022-03-31 | Impeller, fan system applying impeller and range hood |
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| Country | Link |
|---|---|
| CN (1) | CN217270999U (en) |
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