CN113757166A - Centrifugal fan and range hood - Google Patents
Centrifugal fan and range hood Download PDFInfo
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- CN113757166A CN113757166A CN202111019496.3A CN202111019496A CN113757166A CN 113757166 A CN113757166 A CN 113757166A CN 202111019496 A CN202111019496 A CN 202111019496A CN 113757166 A CN113757166 A CN 113757166A
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- 238000009423 ventilation Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 24
- 230000009471 action Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a centrifugal fan and a range hood, wherein the centrifugal fan comprises an impeller, the impeller comprises a front disc; the main air inlet is arranged in the center of the front disc and used for introducing air into the impeller; a chassis disposed opposite to the front chassis; the main fan blades extend from the center of the impeller to the periphery, are sequentially distributed between the front disc and the chassis along the circumferential direction, form an air outlet channel between every two adjacent main fan blades, and are matched with the main air inlet to form a main air duct; and an auxiliary air channel is arranged in at least one air outlet channel, an auxiliary air inlet for feeding air into the auxiliary air channel is correspondingly arranged on the front disc, and the auxiliary air inlet is arranged at a position close to the periphery of the front disc relative to the main air inlet. The centrifugal fan can ventilate from the main air duct of the impeller and can ventilate from the auxiliary air duct, so that the ventilation quantity is increased; in addition, the auxiliary air duct is arranged in the air outlet channel, so that the pressure difference in the air outlet channel can be reduced, the vortex effect is reduced, and the noise is reduced.
Description
Technical Field
The invention belongs to the field of household appliances, and particularly relates to a centrifugal fan and a range hood.
Background
The existing centrifugal fans are all characterized in that air enters between two fan blades through the same air inlet on a front disc to form an air channel, and the air quantity is limited; in addition, when the centrifugal fan operates, the impeller rotates at a high speed, air flow among fan blades of the impeller rotates along with the impeller under the driving of the fan blades, the air flow among the fan blades is thrown to the free tail ends of the fan blades under the action of centrifugal force, wherein the boundary layer air flow on the leeward surface of the fan blades is stripped when approaching the free tail ends of the fan blades and is separated from the leeward surface of the fan blades, and the air flow separated from the leeward surface forms vortex near the free tail ends of the fan blades, so that the vortex not only can reduce the efficiency of the fan, but also can generate noise. In the prior art, the noise is reduced by changing the shape of the blades of the centrifugal fan. Although the noise of the fan is reduced to a certain extent, the method can reduce the air volume of the fan.
The Chinese patent with the application number of 201310051556.9 discloses a centrifugal fan with a flow guide structure, which comprises fan blades, wherein the flow guide structure is arranged on the back surface of one or more fan blades and used for changing parameters of a boundary layer of the blades, so that the boundary layer is delayed in separation, vortex shedding of airflow at the tail edge of the fan blades is prevented, and the noise of the centrifugal fan is reduced.
According to the scheme, the flow guide structure is arranged on the back surface of each fan blade and is attached to the surface of each fan blade so as to change parameters of the boundary layer of each blade, delay the separation of the boundary layer and prevent airflow from generating vortex shedding at the tail edge of each fan blade.
The present invention has been made in view of the above technical drawbacks.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a centrifugal fan which can increase the air inlet amount, reduce the eddy effect and achieve the noise reduction effect.
In order to solve the technical problems, the invention adopts the technical scheme that:
a centrifugal fan comprising, an impeller, the impeller comprising,
a front plate;
the main air inlet is arranged in the center of the front disc and used for introducing air into the impeller;
a chassis disposed opposite to the front chassis;
the main fan blades extend from the center of the impeller to the periphery, are sequentially distributed between the front disc and the chassis along the circumferential direction, form an air outlet channel between every two adjacent main fan blades, and are matched with the main air inlet to form a main air duct;
and an auxiliary air channel is arranged in at least one air outlet channel, an auxiliary air inlet for feeding air into the auxiliary air channel is correspondingly arranged on the front disc, and the auxiliary air inlet is arranged at a position close to the periphery of the front disc relative to the main air inlet.
By adopting the scheme, the impeller can ventilate from the main air duct and the auxiliary air duct, and the ventilation quantity of the centrifugal fan can be increased; in addition, the auxiliary air duct is arranged in the air outlet channel, so that the pressure difference in the air outlet channel can be reduced, the vortex effect is reduced, and the noise is reduced.
Furthermore, at least one auxiliary fan blade is arranged between two adjacent main fan blades, and the at least one auxiliary fan blade is intersected with one position between two ends of one main fan blade and is used for dividing the air outlet channel into a main air outlet channel and at least one auxiliary air channel which are distributed along the circumferential direction of the impeller;
preferably, the position at which the auxiliary fan blade intersects the main fan blade is adjacent to the end of the main fan blade extending peripherally.
By adopting the scheme, the multi-angle ventilation of the impeller can be realized to increase the ventilation quantity, further reduce the vortex effect and reduce the noise; the air outlet channel and the auxiliary air channel are not communicated, so that mutual shunting can be prevented, respective air pressure is guaranteed, and the ventilation efficiency is improved.
Furthermore, one auxiliary fan blade is arranged close to the back of the main fan blade and matched with the back of the main fan blade to form the auxiliary air channel;
one end of the auxiliary fan blade is connected with the back of the main fan blade in a sealing mode, the other end of the auxiliary fan blade is a free end and is located at the outer edge of the front disc, and two side edges of the auxiliary fan blade are connected with the front disc and the chassis in a sealing mode respectively.
Due to the centrifugal effect of the impeller, the part close to the back of the main fan blade generally has no air volume, the part is the most main vortex area, the auxiliary air duct is arranged at the part and can fill the air volume vacancy at the part, the ventilation rate can be improved, and the vortex effect at the part can be eliminated.
Furthermore, a gap is arranged between the front disc and the back of the main fan blade connected with the auxiliary fan blade, corresponding to the auxiliary fan blade, and the gap is configured as the auxiliary air inlet and used for introducing air into the auxiliary air channel;
preferably, the whole part of the front disc corresponding to the auxiliary air duct is of a gap structure.
By adopting the scheme, the air inlet paths of the auxiliary air channel and the main air channel are different, the ventilation paths are also different, the air quantity of the auxiliary air channel comes from the outside of the impeller, and the air of the main air channel cannot be divided.
Further, the length of the auxiliary air duct is smaller than that of the air outlet channel;
preferably, the length of the auxiliary fan blade is smaller than that of the main fan blade.
Furthermore, the width of the auxiliary air duct along the circumferential direction of the impeller is smaller than that of the main air outlet duct.
Because the caliber of the air inlet end of the air outlet channel is small, the caliber of the air outlet end is large, the air quantity close to the air inlet end can be distributed at the whole air inlet end, and local aggregation of the air quantity can be generated close to the air outlet end after the air is centrifuged, so that the length of the auxiliary air channel is set to be smaller than that of the air outlet channel and close to the tail end of the air outlet channel, the air inlet and the air outlet of the air outlet channel are not hindered, the space of the air outlet channel can be utilized to the maximum extent, the ventilation efficiency of the centrifugal fan is improved, the usage amount of auxiliary fan blades can be reduced, the material is saved, and the whole weight of the impeller is reduced; the width of the auxiliary air channel is smaller than that of the main air outlet channel, and the auxiliary air channel only has an auxiliary air inlet effect, so that the auxiliary air channel does not occupy a large space of the air outlet channel and influences air outlet from the main air outlet channel.
Furthermore, the bent shape of the auxiliary fan blade is matched with the bent shape of the back of the main fan blade, and the formed auxiliary air duct is arc-shaped.
By adopting the above scheme, the arc wind channel plays the effect of leading out wind, and can guarantee that the air-out direction is unanimous with the air-out direction of air-out passageway, can prevent that the wind current is alternately, reduces the resistance.
Furthermore, a flow guide fan blade is arranged between two adjacent main fan blades to divide the air outlet channel into two channels which are communicated with each other;
the auxiliary fan blades are arranged at the front parts of the guide fan blades.
By adopting the scheme, the flow guide fan blade can play a role in guiding the wind direction in the opposite direction, the gathering effect of the wind quantity is weakened, the vortex effect in the wind outlet channel is further reduced, and the noise is reduced.
Further, the method also comprises the following steps of,
the volute is sleeved outside the impeller;
the ventilation opening is arranged on the volute, corresponds to the main air inlet and is used for feeding air into the volute from the outside;
the front disc and the volute are provided with a gap in the axial direction, and the auxiliary air channel enters air from the gap inwards in the axial direction.
By adopting the above scheme, ventilation is convenient for pass through the air inlet in clearance department along the axial to the auxiliary air channel from the vent to improve the amount of wind that gets into the impeller.
Another object of the present invention is to provide a range hood, which has the above centrifugal fan.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. The impeller can ventilate from the main air duct and can ventilate from the auxiliary air duct, and the ventilation quantity of the centrifugal fan can be increased; in addition, the auxiliary air duct is arranged in the air outlet channel, so that the pressure difference in the air outlet channel can be reduced, the vortex effect is reduced, and the noise is reduced.
2. At least one auxiliary fan blade is arranged between two adjacent main fan blades, so that multi-angle ventilation of the impeller can be realized to increase ventilation volume, the vortex effect can be further reduced, and noise can be reduced; the air outlet channel and the auxiliary air channel are not communicated, so that mutual shunting can be prevented, respective air pressure is guaranteed, and the ventilation efficiency is improved.
3. The auxiliary fan blades are arranged close to the back of the main fan blade and matched with the back of the main fan blade to form an auxiliary air channel, so that the air quantity vacancy caused by the centrifugal effect at the position can be filled, the ventilation quantity can be improved, and the vortex effect at the position can be eliminated.
4. The air inlet path of the auxiliary air channel is different from that of the main air channel, the ventilation path is also different, the air quantity of the auxiliary air channel comes from the outside of the impeller, the air quantity is increased, meanwhile, the air of the main air channel cannot be shunted, and therefore the ventilation efficiency of the main air channel is guaranteed.
5. The length of the auxiliary air channel is set to be smaller than that of the air outlet channel and close to the tail end of the air outlet channel, so that air inlet and outlet of the air outlet channel are not hindered, the space of the air outlet channel can be utilized to the maximum extent, the ventilation efficiency of the centrifugal fan is improved, the use amount of auxiliary fan blades can be reduced, materials are saved, and the overall weight of the impeller is reduced; the width of the auxiliary air channel is smaller than that of the main air outlet channel, and the auxiliary air channel only has an auxiliary air inlet effect, so that the auxiliary air channel does not occupy a large space of the air outlet channel and influences air outlet from the main air outlet channel.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of an exploded structure of a centrifugal fan according to the present invention;
FIG. 2 is a schematic structural view of the impeller of the present invention;
fig. 3 is a partial sectional structural schematic view of the impeller of the present invention.
In the figure: 1. an impeller; 11. a front plate; 111. a main air inlet; 12. a chassis; 13. a main fan blade; 14. an air outlet channel; 141. an auxiliary air duct; 1411. an auxiliary air inlet; 142. a main air outlet channel; 1421. a first channel; 1422. a second channel; 16. auxiliary fan blades; 17. a guide vane; 2. a volute; 21. and a vent.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, a centrifugal fan of the present invention includes an impeller 1, where the impeller 1 includes a front disk 11; the main air inlet 111 is arranged in the center of the front disc 11 and used for introducing air into the impeller 1; a chassis 12 disposed opposite to the front chassis 11; a plurality of main blades 13 extend from the center to the periphery of the impeller 1 and are circumferentially distributed between the front disc 11 and the chassis 12, an air outlet channel 14 is formed between every two adjacent main blades 13, and the air outlet channel 14 is matched with the main air inlet 111 to form a main air duct; an auxiliary air duct 141 is arranged in at least one of the air outlet channels 14, an auxiliary air inlet 1411 for supplying air into the auxiliary air duct 141 is correspondingly arranged on the front disk 11, and the auxiliary air inlet 1411 is arranged at a position close to the periphery of the front disk 11 relative to the main air inlet 111.
The auxiliary air inlet 1411 is formed by a notch arranged on the front disc 11, or an air inlet pipe arranged on the front disc 11 and communicated with the auxiliary air duct 141.
As an embodiment, each air outlet channel 14 is provided with an auxiliary air duct 141 therein.
According to the invention, the auxiliary air duct 141 is arranged in the air outlet channel 14 of the impeller 1, so that the air can be ventilated from the main air duct and the auxiliary air duct 141, and the ventilation quantity of the centrifugal fan can be increased; in addition, the auxiliary air duct 141 is disposed in the air outlet channel 14, so that the pressure difference in the air outlet channel 14 can be reduced, the vortex effect can be reduced, and the noise can be reduced.
As shown in fig. 2, the main fan blade 13 is triangular, and one end facing the main air inlet 111 is a tip, so that the width of the main fan blade 13 is gradually increased along the air outlet direction, thereby facilitating the flow guiding. One side of the main fan blade 13 is perpendicular to the base plate 12 and is connected with the base plate 12 in a sealing manner, and one side facing the front plate 11 is a bevel edge which extends from the tip end to the outer edge close to the front plate 11 along the axial direction and the radial direction of the impeller 1, and the tail end of the bevel edge is connected with the front plate 11 in a sealing manner. The air outlet end of the main fan blade 13 is located at the outer edges of the chassis 12 and the front disk 11, and is perpendicular to the chassis 12 and the front disk 11.
Further, at least one auxiliary fan blade 16 is arranged between two adjacent main fan blades 13, the orientation of two sides of the auxiliary fan blade 16 is the same as the orientation of the main fan blade 13, and the at least one auxiliary fan blade 16 intersects with one position between two ends of one main fan blade 13, so as to divide the air outlet channel 14 into a main air outlet channel 142 and at least one auxiliary air channel 141 which are distributed along the circumferential direction of the impeller 1.
The position where the auxiliary fan blade 16 intersects with the main fan blade 13 is close to the end of the main fan blade 13 extending towards the periphery, and further, the auxiliary fan blade 16 is arranged close to the end of the main fan blade 13 extending towards the periphery.
Further, the main air outlet channel 142 and the auxiliary air channel 141 are not communicated; preferably, the auxiliary ducts 141 are not communicated with each other.
The scheme can realize multi-surface ventilation of the impeller 1 so as to increase the ventilation quantity of the impeller 1, further reduce the vortex effect and reduce the noise; the air outlet channel 14 and the auxiliary air duct 141 are not communicated, so that mutual shunting can be prevented, respective air pressure is ensured, and the ventilation efficiency is improved.
The auxiliary fan blades 16 are arranged close to the back of the main fan blade 13, the adjacent two auxiliary fan blades 16 and/or the auxiliary fan blades 16 are matched with the back of the main fan blade 13 to form the auxiliary air channel 141, one end of each auxiliary fan blade 16 is in sealing connection with the back of the main fan blade 13 and/or the adjacent auxiliary fan blades 16, the other end of each auxiliary fan blade is a free end and is located at the outer edge of the front disc 11, and two side edges of each auxiliary fan blade are respectively in sealing connection with the front disc 11 and the chassis 12.
Due to the centrifugal action of the impeller 1, the part of the main fan blade 13 close to the back of the main fan blade 13 generally has no air volume and is the most main vortex area, and the auxiliary air duct 141 is arranged at the position to fill the air volume vacancy, so that the ventilation rate can be improved, and the vortex effect at the position can be eliminated.
Openings are formed between the two auxiliary fan blades 16 and/or between the auxiliary fan blades 16 and the back of the main fan blade 13 on the front disc 11, so as to form auxiliary air inlets 1411 of the auxiliary air channels 141, and the auxiliary air inlets are used for supplying air into the auxiliary air channels 141.
As shown in fig. 2, the whole part of the front plate 11 corresponding to the auxiliary air duct 141 is a notch structure. The auxiliary air duct 141 extends to one side of the front disc 11 along the axial direction, and penetrates through the front disc 11 to form the auxiliary air inlet 1411, and the auxiliary air inlet 1411 is consistent with the auxiliary air duct 141 in cross section shape along the radial direction of the impeller 1, so that the area of the auxiliary air inlet 1411 is increased, and the ventilation volume is increased.
The auxiliary air duct 141 is different from the main air duct in air inlet path and ventilation path, the air quantity of the auxiliary air duct 141 comes from the outside of the impeller 1, the air of the main air duct is not shunted, and the wind strength in the main air duct can be ensured while the whole air quantity of the impeller 1 is ensured to be increased.
As one solution, as shown in fig. 2 and fig. 3, the auxiliary fan blade 16 is provided with one, and is disposed near the back of the main fan blade 13, and cooperates with the back of the main fan blade 13 to form the auxiliary air duct 141; one end of the auxiliary fan blade 16 is hermetically connected with the back of the main fan blade 13, the other end is a free end and is positioned at the outer edge of the front disc 11, and two side edges are hermetically connected with the front disc 11 and the chassis 12 respectively.
The free end of the auxiliary fan blade 16 and the end of the main fan blade 13 are located on the same circumferential surface and are substantially flush with the outer edge of the bottom plate 12 of the front plate 11.
An auxiliary air inlet 1411 is arranged on the front disk 11 between the auxiliary fan blade 16 and the back of the main fan blade 13 connected with the auxiliary fan blade 16, and is used for supplying air into the auxiliary air duct 141.
As an alternative to the above scheme, at least two auxiliary blades 16 are arranged in the air outlet channel 14, and are disposed near the back of the main blade 13, the two adjacent auxiliary blades 16 and the auxiliary blades 16 cooperate with the back of the main blade 13 to form the at least two auxiliary air channels 141, and the auxiliary air channels 141 and the main air outlet channel 142 are not communicated with each other. One end of the auxiliary fan blade 16 is hermetically connected with the back of the main fan blade 13 or the adjacent auxiliary fan blade 16, the other end is a free end and is positioned at the outer edge of the front disc 11, and two side edges are hermetically connected with the front disc 11 and the chassis 12 respectively. An auxiliary air inlet 1411 is arranged on the front disk 11 corresponding to the space between the two auxiliary fan blades 16 and the space between the auxiliary fan blade 16 and the back of the main fan blade 13, and is used for supplying air into each auxiliary air duct 141.
As shown in fig. 3, the length of the auxiliary air duct 141 is smaller than that of the air outlet channel 14, and is disposed near the air outlet end of the main air duct, the auxiliary air duct 141 is formed from one end of the auxiliary fan blade 16 connected with the main fan blade 13, and/or one end of the adjacent two auxiliary fan blades 16 connected is gradually opened along the radial direction of the impeller 1, and the gradual opening trend is the same as that of the air outlet channel 14.
The length of the auxiliary fan blade 16 is less than that of the main fan blade 13, the auxiliary fan blade is arranged close to the tail end of the main fan blade 13, and one end of the auxiliary fan blade 16 is hermetically connected with the protruding part on the back of the main fan blade 13.
As shown in fig. 2 and fig. 3, the cross-sectional structure of two adjacent auxiliary fan blades 16 and/or the auxiliary fan blades 16 connected to the main fan blade 13 is a herringbone, and the auxiliary air inlet 1411 is an arc triangle.
As shown in fig. 2 and 3, the width of the auxiliary air duct 141 along the circumferential direction of the impeller 1 is smaller than the width of the main air outlet duct 142.
As an embodiment, the sum of the widths of the auxiliary air ducts 141 in the same air outlet channel 14 along the circumferential direction of the front disk 11 is smaller than the width of the main air outlet duct 142 in the air outlet channel 14.
Because the aperture of the air inlet end of the air outlet channel 14 is small, the aperture of the air outlet end is large, the air volume close to the air inlet end can be distributed at the whole air inlet end, and local aggregation of the air volume can be generated only when the air volume is close to the air outlet end after centrifugal action, the length of the auxiliary air channel 141 is set to be smaller than that of the air outlet channel 14 and close to the tail end of the air outlet channel 14, so that the air inlet and the air outlet of the air outlet channel 14 are not hindered, the space of the air outlet channel 14 can be utilized to the maximum extent, the ventilation efficiency of the centrifugal fan is improved, the usage amount of auxiliary fan blades 16 can be reduced, the material is saved, and the overall weight of the impeller 1 is reduced; the width of the auxiliary air duct 141 is smaller than the width of the main air outlet duct 142, which means that the auxiliary air duct 141 only has the auxiliary air intake function, and does not occupy a large space of the air outlet channel 14, which affects the air outlet from the main air outlet duct 142.
As shown in fig. 2 and fig. 3, the bent shape of the auxiliary fan blade 16 matches with the bent shape of the back of the main fan blade 13, the formed auxiliary air duct 141 is arc-shaped, the arc-shaped air duct plays a role of guiding the air out, and the air out direction can be ensured to be consistent with the air out direction of the air out channel 14, so that the air current can be prevented from crossing, and the resistance can be reduced.
As shown in fig. 3, a flow guiding fan 17 is disposed between two adjacent main blades 13 to divide the air outlet channel 14 into two channels communicated with each other; the auxiliary fan blades 16 are arranged at the front parts of the guide fan blades 17, and gaps are formed between the auxiliary fan blades and the guide fan blades 17.
The diversion fan blades 17 are arranged in the air outlet channel 14 along the air outlet direction, the orientation of the two sides of the diversion fan blades 17 is consistent with that of the main fan blades 13, the length of the diversion fan blades 17 is smaller than that of the main fan blades 13, and the bending shapes of the diversion fan blades 17 are matched with that of the back parts of the main fan blades 13.
The guide fan 17 cooperates with the auxiliary fan 16 and the main fan 13 connected to the auxiliary fan 16 to form a first channel 1421, and the guide fan 17 cooperates with the main fan 13 at a side far from the auxiliary fan 16 to form a second channel 1422. The width of the auxiliary air duct 141 along the circumferential direction of the front disk 11 is smaller than the width of the first passage 1421, and the width of the first passage 1421 along the circumferential direction of the front disk 11 is smaller than the width of the second passage 1422.
Due to the centrifugal effect, the wind flow is gathered at the front part of the main fan blade 13, so that the wind outlet end of the second channel 1422 generally does not have the vortex effect, and under the action of the guide fan blade 17, the wind flow can be gradually guided to the opposite side to play a role in dispersing the wind flow, so as to reduce the vortex effect in the wind outlet channel 14 and reduce the noise; because the air quantity of the front part of the guide fan blade 17 and the part close to the back of the main fan blade 13 is small or even no air exists, the space at the position is wasted, and the vortex effect is easy to occur due to the action of the pressure difference, the auxiliary air duct 141 is correspondingly arranged at the position, the space of the air outlet channel 14 can be fully utilized, and the air quantity is improved.
As an embodiment, the main blade 13, the auxiliary blade 16, the front plate 11 and the bottom plate 12 are integrally formed to ensure the connection effect and the sealing property.
As shown in fig. 1, the centrifugal fan of the present invention further includes a volute 2, which is sleeved outside the impeller 1; the ventilation opening 21 is arranged on the volute 2, corresponds to the main air inlet 111, and is used for introducing air from outside to inside the volute 2; a gap is formed between the front disc 11 and the volute 2 in the axial direction, and the auxiliary air duct 141 enters air from the gap along the axial direction.
A gap is formed between the outer periphery of the impeller 1 and the peripheral wall of the casing, and the air discharged from the air outlet channel 14 is discharged from the air outlet of the volute 2 through the gap.
The working principle is as follows: the wind entering the volute 2 from the ventilation opening 21 is divided into two parts in the gap between the front disc 11 and the volute 2, and one part enters the impeller 1 from the main air inlet 111 and is discharged from the air outlet of the volute 2 after being discharged along the first channel 1421 and the second channel 1422 in the main air outlet channel 142; the other one enters the auxiliary air duct 141 from the auxiliary air inlet 1411 near the outer edge of the front disk 11, and is directly discharged through the air outlet end and then discharged from the air outlet of the volute 2.
The axial gap between the front disk 11 and the volute 2 is convenient for ventilation from the ventilation opening 21 to the air inlet of the auxiliary air duct 141 along the axial direction through the gap, so as to improve the air quantity entering the impeller 1.
Another object of the present invention is to provide a range hood, which has the above centrifugal fan.
The above embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed by the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the equivalent embodiments by using the technical contents disclosed above without departing from the technical scope of the present invention, and the embodiments in the above embodiments can be further combined or replaced, but any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (10)
1. A centrifugal fan comprising an impeller, the impeller comprising,
a front plate;
the main air inlet is arranged in the center of the front disc and used for introducing air into the impeller;
a chassis disposed opposite to the front chassis;
the main fan blades extend from the center of the impeller to the periphery, are sequentially distributed between the front disc and the chassis along the circumferential direction, form an air outlet channel between every two adjacent main fan blades, and are matched with the main air inlet to form a main air duct;
the air outlet channel is internally provided with an auxiliary air channel, the front disc is correspondingly provided with an auxiliary air inlet for feeding air into the auxiliary air channel, and the auxiliary air inlet is arranged at a position close to the periphery of the front disc relative to the main air inlet.
2. The centrifugal fan according to claim 1, wherein at least one auxiliary fan blade is disposed between two adjacent main fan blades, and the at least one auxiliary fan blade intersects with a position between two ends of one main fan blade, so as to divide the air outlet channel into a main air outlet channel and at least one auxiliary air outlet channel that are circumferentially distributed along the impeller;
preferably, the position at which the auxiliary fan blade intersects the main fan blade is adjacent to the end of the main fan blade extending peripherally.
3. The centrifugal fan as claimed in claim 2, wherein the auxiliary fan blade is provided with one, which is arranged near the back of the main fan blade and cooperates with the back of the main fan blade to form the auxiliary air duct;
one end of the auxiliary fan blade is connected with the back of the main fan blade in a sealing mode, the other end of the auxiliary fan blade is a free end and is located at the outer edge of the front disc, and two side edges of the auxiliary fan blade are connected with the front disc and the chassis in a sealing mode respectively.
4. The centrifugal fan according to claim 3, wherein a gap is formed between the corresponding auxiliary fan blade on the front disk and the back of the main fan blade connected with the auxiliary fan blade, and the gap is configured as the auxiliary air inlet and used for introducing air into the auxiliary air duct;
preferably, the whole part of the front disc corresponding to the auxiliary air duct is of a gap structure.
5. The centrifugal fan according to any one of claims 2-4, wherein the length of the auxiliary air duct is smaller than that of the air outlet channel;
preferably, the length of the auxiliary fan blade is smaller than that of the main fan blade.
6. The centrifugal fan as claimed in claim 2, wherein the width of the auxiliary air duct in the circumferential direction of the impeller is smaller than the width of the main air outlet duct.
7. The centrifugal fan as claimed in claim 2, wherein the auxiliary fan blades have a bent shape matching the bent shape of the back of the main fan blades, and the auxiliary air duct is formed in an arc shape.
8. The centrifugal fan according to claim 2, wherein a flow guide fan blade is disposed between two adjacent main fan blades to divide the air outlet channel into two channels communicated with each other;
the auxiliary fan blades are arranged at the front parts of the guide fan blades.
9. The centrifugal fan according to claim 1, further comprising,
the volute is sleeved outside the impeller;
the ventilation opening is arranged on the volute, corresponds to the main air inlet and is used for feeding air into the volute from the outside;
the front disc and the volute are provided with a gap in the axial direction, and the auxiliary air channel enters air from the gap inwards in the axial direction.
10. A range hood having a centrifugal fan as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111019496.3A CN113757166A (en) | 2021-09-01 | 2021-09-01 | Centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111019496.3A CN113757166A (en) | 2021-09-01 | 2021-09-01 | Centrifugal fan and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113757166A true CN113757166A (en) | 2021-12-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111019496.3A Pending CN113757166A (en) | 2021-09-01 | 2021-09-01 | Centrifugal fan and range hood |
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| Country | Link |
|---|---|
| CN (1) | CN113757166A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051357A1 (en) * | 2022-09-09 | 2024-03-14 | 续新技术(深圳)集团有限公司 | Electric motor base, electric motor and high-speed fan |
-
2021
- 2021-09-01 CN CN202111019496.3A patent/CN113757166A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051357A1 (en) * | 2022-09-09 | 2024-03-14 | 续新技术(深圳)集团有限公司 | Electric motor base, electric motor and high-speed fan |
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