CN212690391U - Centrifugal fan and range hood - Google Patents
Centrifugal fan and range hood Download PDFInfo
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- CN212690391U CN212690391U CN202021572118.9U CN202021572118U CN212690391U CN 212690391 U CN212690391 U CN 212690391U CN 202021572118 U CN202021572118 U CN 202021572118U CN 212690391 U CN212690391 U CN 212690391U
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Abstract
The utility model provides a centrifugal fan and a range hood, relating to the technical field of kitchen appliances, wherein the centrifugal fan comprises a volute and a guide plate; the volute is provided with a cavity and an air outlet communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet; an impeller assembly is arranged in the impeller cavity, and the plane where the air outlet is located is parallel to the circumferential plane of the impeller in the impeller assembly; the guide plate is arranged in the guide cavity, the guide plate is bent from the outlet of the impeller cavity to the direction of the air outlet, and the guide plate divides the guide cavity into a plurality of cavities; the range hood comprises the centrifugal fan. The utility model discloses alleviated the centrifugal fan system who uses axial business turn over wind structural design among the prior art among the traditional range hood, its spiral case export corner structure leads to the flow separation and produces the vortex district that flows, and then reduces range hood's aerodynamic performance, centrifugal impeller work efficiency to and the big technical problem of traditional range hood aerodynamic noise.
Description
Technical Field
The utility model belongs to the technical field of kitchen appliance and specifically relates to a centrifugal fan and range hood are related to.
Background
The range hood is regarded as the important improvement instrument of kitchen culinary art environment, and the aspects such as its oil absorption cigarette effect, noise at work receive consumers 'attention more and more, how to further improve range hood's oil absorption cigarette effect, reduce the noise that range hood during operation produced, have become the key and the difficult point of current range hood industry technical research and development. When the range hood works, a fan rotates to generate negative pressure, oil smoke generated by cooking is sucked into the smoke collecting hood and is exhausted out of a room through an air channel and a smoke exhaust pipeline, wherein the air channel refers to a fan system in the range hood and comprises an impeller, a volute, a motor and the like; by optimally designing the flow path and the flow field structure of the oil smoke gas flow in the range hood, the aerodynamic performance of the range hood is improved, the oil smoke absorption effect of the range hood can be effectively improved, and meanwhile, the aerodynamic noise generated by the flow is reduced.
According to the working principle that the range hood generates negative pressure by depending on the rotation of the fan to suck and remove oil smoke, the lower the height of the air inlet of the fan under the same condition, the better the oil smoke suction effect of the range hood, so that if a fan system with an axial air inlet and outlet structure design is adopted, the height of the negative pressure area at the inlet of the fan can be effectively reduced by matching with a sunken installation and arrangement mode, and the oil smoke suction effect of the range hood is improved; the conventional Chinese style range hood adopts a centrifugal fan system with an axial air inlet and outlet structure more.
However, the working principle and technical features of the centrifugal fan determine that the flow direction of the oil fume after leaving the outlet of the impeller is still radial after the oil fume flow is accelerated by the rotation of the centrifugal impeller, and the direction of the air outlet of the volute of the centrifugal fan designed by the axial air inlet and outlet structure is along the axial direction, so that the oil fume flow inevitably has a vertical corner close to 90 degrees, simulation calculation and analysis are performed by a CFD (Computational Fluid Dynamics) simulation technology, and the obtained air velocity distribution cloud map inside the air duct can obviously solve the technical problems in the prior art at least as follows by combining: the flow field structure of the volute outlet corner area of the centrifugal fan is poor, and the low-speed vortex area of the air duct outlet is large to form flow blockage, so that the flow loss of the internal oil smoke flow is large, and the aerodynamic performance of the range hood is reduced; the oil smoke flow in the air duct has uneven flow velocity distribution in the axial direction, and the oil smoke flow close to one side of the lower end of the air duct has lower velocity, so that the working efficiency of the centrifugal impeller is influenced; the internal flow separation phenomenon and the flow vortex area range of the centrifugal fan are obvious, the generated pneumatic noise is large, and the overall noise level of the range hood is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a centrifugal fan and range hood to use axial business turn over wind structural design's centrifugal fan system among the traditional range hood in alleviating prior art, its spiral case export corner structure leads to the separation of flowing and produces the vortex district that flows, and then reduces range hood's aerodynamic performance, centrifugal impeller work efficiency, and the big technical problem of traditional range hood aerodynamic noise.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a centrifugal fan, including a volute and a flow guide plate;
the volute is provided with a cavity and an air outlet communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet; an impeller assembly is arranged in the impeller cavity, and the plane where the air outlet is located is parallel to the circumferential plane of an impeller in the impeller assembly;
the guide plate is arranged in the guide cavity, the guide plate is bent from the outlet of the impeller cavity to the direction of the air outlet, and the guide plate divides the guide cavity into a plurality of cavities.
In an alternative embodiment, the length direction of the flow guide plate extends from one end of the flow guide cavity close to the impeller cavity to one end of the flow guide cavity close to the air outlet, and two sides of the flow guide plate in the width direction are respectively connected to two opposite sides of the coaming of the volute.
In an optional embodiment, the volute comprises an upper plate, a lower plate and a surrounding plate, wherein the upper plate comprises a first straight panel and a first arc-shaped curved plate, one end of the first arc-shaped curved plate is connected with one end of the first straight panel, and the surface of the first arc-shaped curved plate is tangent to the surface of the first straight panel; the lower plate comprises a second straight panel and a second arc-shaped curved plate, one end of the second arc-shaped curved plate is connected with one end of the second straight panel, and the plate surface of the second arc-shaped curved plate is tangent to the plate surface of the second straight panel;
the first straight panel and the second straight panel are parallel to each other, and the circle center corresponding to the first arc-shaped curved plate and the circle center corresponding to the second arc-shaped curved plate are the same circle center; the first straight panel, the second straight panel and one part of the coaming enclose the impeller cavity, and the first arc-shaped curved plate, the second arc-shaped curved plate and the other part of the coaming enclose the diversion cavity.
In an alternative embodiment, the centrifugal fan further comprises an outlet panel; the other end of the first arc-shaped curved plate, the other end of the second arc-shaped curved plate and one end, far away from the impeller cavity, of the part of the enclosing plate, which encloses the diversion cavity, are connected to the outlet panel; the air outlet is formed in the outlet panel, and the outlet panel is parallel to the circumferential plane of the impeller in the impeller assembly.
In an alternative embodiment, the guide plate comprises an inlet guide straight plate section, an arc plate section and an outlet guide straight plate section which are connected in sequence along a direction extending from one end of the guide cavity close to the impeller cavity to one end of the guide cavity close to the air outlet;
the plate surface of the inlet flow guide flat plate section and the plate surface of the outlet flow guide flat plate section are tangent to the plate surfaces of the arc plate sections; and the circle center corresponding to the plate surface of the arc plate section, the circle center corresponding to the first arc-shaped curved plate and the circle center corresponding to the second arc-shaped curved plate are the same circle center.
In an alternative embodiment, a circumferential straight surface of an impeller in the impeller assembly is taken as a horizontal plane, and the installation positions of the air outlet and the impeller cavity in the horizontal plane are staggered;
when the radius corresponding to the side of the arc plate section close to the impeller assembly in the width direction is R1, and the radius corresponding to the side of the arc plate section far from the impeller assembly in the width direction is R2, R1 is less than or equal to R2.
In an alternative embodiment, the circumferential straight surface of the impeller in the impeller assembly is taken as a horizontal plane; and an included angle between one side edge of the inlet flow guide straight plate section close to the impeller assembly and the vertical surface in the width direction is alpha 1, and an included angle between one side edge of the inlet flow guide straight plate section far away from the impeller assembly and the vertical surface in the width direction is alpha 2, so that alpha 1 is larger than or equal to 80 degrees and alpha 2 is smaller than or equal to 90 degrees.
In an alternative embodiment, the circumferential straight surface of the impeller in the impeller assembly is taken as a horizontal plane; and an included angle between one side edge of the outlet flow guide straight plate section close to the impeller assembly and the horizontal plane in the width direction is beta 1, and an included angle between one side edge of the outlet flow guide straight plate section far away from the impeller assembly and the horizontal plane in the width direction is beta 2, so that beta 1 is larger than or equal to 75 degrees and beta 2 is smaller than or equal to 90 degrees.
In an alternative embodiment, the thickness of the inlet flow guiding straight plate section is gradually reduced along a direction extending from one end of the flow guiding cavity close to the impeller cavity to one end of the flow guiding cavity close to the air outlet, and the relative thickness of the inlet flow guiding straight plate section is epsilon, so that epsilon is more than or equal to 15% and less than or equal to 25%.
In an alternative embodiment, the baffle has a plurality of baffles, the plurality of baffles being parallel to one another;
and/or the guide plate is made of sound-absorbing materials or is provided with sound-absorbing holes.
In a second aspect, an embodiment of the present invention provides a range hood, including any one of the centrifugal fans described in the foregoing embodiments.
The embodiment of the utility model provides a can realize following beneficial effect:
in a first aspect, an embodiment of the present invention provides a centrifugal fan, which includes a volute and a flow guide plate; the volute is provided with a cavity and an air outlet communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet; an impeller assembly is arranged in the impeller cavity, and the plane where the air outlet is located is parallel to the circumferential plane of the impeller in the impeller assembly; the guide plate is arranged in the guide cavity, the guide plate is bent from the outlet of the impeller cavity to the direction of the air outlet, and the guide plate divides the guide cavity into a plurality of cavities.
In the embodiment of the utility model, the plane where the air outlet is located is parallel to the circumferential plane of the impeller in the impeller assembly, thereby, the diversion cavity is used as a centrifuge to convert the airflow from the radial direction to the axial outlet corner airflow channel, and the diversion cavity is additionally provided with the diversion plate at the outlet corner position of the volute of the centrifugal fan with the axial air inlet and outlet structure design, namely, the diversion plate is arranged in the diversion cavity, so that the flow field structure of the outlet corner area of the volute can be effectively improved, the flowing vortex area range is reduced, the flowing loss of the oil smoke airflow is reduced, and the aerodynamic performance of the range hood is further; the guide plate has the advantages that the flow path of the oil smoke gas flow in the air duct is optimized through the guide effect of the guide plate on the high-speed gas flow at the centrifugal impeller outlet of the impeller assembly, the distribution uniformity of the oil smoke gas flow in the axial direction is improved, and the working efficiency of the centrifugal impeller in the impeller assembly is improved; meanwhile, the flow field structure of the oil smoke gas flow in the centrifugal fan is optimized, the flow separation phenomenon is reduced, the flow loss is reduced, the uniformity of the high-speed gas flow at the outlet of the air duct is improved, and the pneumatic noise of the centrifugal fan is effectively reduced.
The specific effects achieved above can be simulated, calculated and analyzed by a CFD (Computational Fluid Dynamics) simulation technology, and verified by combining with the obtained cloud map of the air flow velocity distribution inside the air duct, which proves that compared with a centrifugal fan without the above-mentioned guide plate and a centrifugal fan with the above-mentioned guide plate, the flow field structure in the volute guide cavity is obviously optimized, the range of the low-speed flow vortex region of the oil smoke flow is obviously reduced, and the velocity distribution uniformity of the oil smoke flow in the axial direction is obviously improved.
In a second aspect, an embodiment of the present invention provides a range hood, including the centrifugal fan provided in the first aspect; because the embodiment of the utility model provides a range hood includes the centrifugal fan that the first aspect provided, therefore, the embodiment of the utility model provides a range hood can reach all beneficial effects that the centrifugal fan that the first aspect provided can reach.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an axial view of an overall structure of a centrifugal fan according to an embodiment of the present invention;
fig. 2 is a front sectional view of an overall structure of a centrifugal fan according to an embodiment of the present invention;
fig. 3 is a schematic view of an installation structure of a flow guide plate in a centrifugal fan according to an embodiment of the present invention;
fig. 4 is a schematic view of an overall structure of a flow guide plate in a centrifugal fan according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion A of FIG. 4;
fig. 6 is a schematic view of the overall structure of the range hood provided by the embodiment of the present invention;
fig. 7 is an exploded schematic view of a range hood provided in an embodiment of the present invention.
Icon: 1-upper plate; 11-a first flat panel; 12-a first arc-shaped curved plate; 2-lower plate; 21-a second flat panel; 22-a second arc-shaped curved plate; 3-enclosing plates; 4-a flow guide plate; 41-inlet flow guide straight plate section; 42-arc plate section; 43-outlet flow guide flat plate section; 5, air outlet; 6-an impeller assembly; 7-an outlet panel; 81-check valve; 82-a smoke collecting hood; 83-a motor; 84-sealing ring; 85-a wind guide ring; 86-filtering the oil screen; 87-oil cup.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Example one
The present embodiment provides a centrifugal fan, which, with reference to fig. 1 to 5, comprises a volute and a baffle 4.
Specifically, the volute is provided with a cavity and an air outlet 5 communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet 5; an impeller assembly 6 is arranged in the impeller cavity, the volute comprises an upper plate 1, a lower plate 2 and a coaming plate 3, an air inlet is formed in the coaming plate 3 or the lower plate 2 of the volute and used for enabling the impeller assembly 6 to rotate and suck oil smoke into the impeller cavity, the plane where the air outlet 5 is located is parallel to the circumferential plane of an impeller in the impeller assembly 6, and the rotating plane, perpendicular to the rotating shaft of a centrifugal impeller in the impeller assembly 6, in the impeller assembly 6 is used as the circumferential plane of the impeller in the impeller assembly 6; the guide plate 4 is installed in the guide cavity, the guide plate 4 is bent from the outlet of the impeller cavity to the direction of the air outlet 5, and the guide plate 4 divides the guide cavity into a plurality of cavities.
In this embodiment, the plane where the air outlet 5 is located is parallel to the circumferential plane of the impeller in the impeller assembly 6, so that the flow guide cavity serves as an outlet corner airflow channel for the centrifuge to convert the airflow from the radial direction to the axial direction, and the flow guide plate 4 is additionally arranged in the flow guide cavity at the outlet corner position of the volute of the centrifugal fan with the axial air inlet and outlet structure design, so that the flow field structure of the outlet corner area of the volute can be effectively improved, the range of a flowing vortex area is reduced, the flow loss of oil smoke airflow is reduced, and the aerodynamic performance of the range hood is further improved; the guide plate 4 has the function of guiding high-speed airflow at the centrifugal impeller outlet of the impeller assembly 6, so that the flow path of the oil smoke airflow in the air duct is optimized, the distribution uniformity of the oil smoke airflow in the axial direction is improved, and the working efficiency of the centrifugal impeller in the impeller assembly 6 is improved; meanwhile, the flow field structure of the oil smoke gas flow in the centrifugal fan is optimized, the flow separation phenomenon is reduced, the flow loss is reduced, the uniformity of the high-speed gas flow at the outlet of the air duct is improved, and the pneumatic noise of the centrifugal fan can be effectively reduced.
The specific effects achieved above can be simulated, calculated and analyzed by a CFD (Computational Fluid Dynamics) simulation technique, and verified by combining with the obtained cloud map of the velocity distribution of the air flow inside the air duct, which proves that compared with the centrifugal fan without the above-mentioned guide plate 4 and the centrifugal fan with the above-mentioned guide plate 4, the flow field structure in the volute guide cavity is obviously optimized, the range of the low-velocity flow vortex region of the oil smoke flow is obviously reduced, and the velocity distribution uniformity of the oil smoke flow in the axial direction is obviously improved.
With continued reference to fig. 1 to 5, in an alternative embodiment of this embodiment, it is preferable that the length direction of the flow guide plate 4 extends from one end of the flow guide chamber close to the impeller chamber to one end of the flow guide chamber close to the air outlet 5, and two side edges of the flow guide plate 4 in the width direction are respectively connected to two opposite side surfaces of the shroud plate 3 of the volute, wherein the connection structure of the upper plate 1, the lower plate 2 and the shroud plate 3 of the volute may be directly and integrally formed, or may be separately manufactured and then welded or clamped or connected in other connection manners, and the flow guide plate 4 may be clamped or connected by screws or integrally formed or connected in other manners to the shroud plate 3; of course, in other alternative embodiments of this embodiment, the baffle 4 may be installed inside the baffle cavity in other installation manners, for example, but not limited to, after one end of the baffle 4 in the length direction is extended to the outside of the air outlet 5, the portion of the baffle 4 extended to the outside of the air outlet 5 is fixedly connected to the shroud 3 of the volute by using screws or bolts or welding, etc., but in contrast, it is preferable to install the baffle 4 inside the baffle cavity by using the above structure "two sides of the baffle 4 in the width direction are respectively connected to two opposite sides of the shroud 3 of the volute" to ensure the stability of the structure of the baffle 4 installed inside the baffle cavity.
In addition, referring to fig. 2, in addition to any one of the above optional embodiments of the present embodiment, it is further preferable that the upper plate 1 of the scroll casing includes a first flat plate 11 and a first arc-shaped curved plate 12, one end of the first arc-shaped curved plate 12 is connected to one end of the first flat plate 11, and a plate surface of the first arc-shaped curved plate 12 is tangent to the plate surface of the first flat plate 11; the lower plate 2 includes a second flat panel 21 and a second arc-shaped curved plate 22, one end of the second arc-shaped curved plate 22 is connected to one end of the second flat panel 21, and the surface of the second arc-shaped curved plate 22 is tangent to the surface of the second flat panel 21. The first straight panel 11 and the second straight panel 21 are parallel to each other, and the circle center corresponding to the first arc-shaped curved panel 12 and the circle center corresponding to the second arc-shaped curved panel 22 are the same circle center; the first straight panel 11, the second straight panel 21 and one part of the enclosing plate 3 enclose an impeller cavity, and the first arc-shaped curved panel 12, the second arc-shaped curved panel 22 and the other part of the enclosing plate 3 enclose a diversion cavity.
With reference to fig. 1 to 3, in a further alternative embodiment, the centrifugal fan further comprises an outlet panel 7; the other end of the first arc-shaped curved plate 12, the other end of the second arc-shaped curved plate 22 and one end of the part of the coaming 3 which is enclosed into the diversion cavity and is far away from the impeller cavity are all connected with the outlet panel 7; the air outlet 5 is arranged on an outlet panel 7, and the outlet panel 7 is parallel to the circumferential plane of the impeller in the impeller assembly 6.
In addition, referring to fig. 3 and 4, in the above alternative embodiment in which the upper plate 1 includes the first flat panel 11 and the first arc-shaped curved plate 12, and the lower plate 2 includes the second flat panel 21 and the second arc-shaped curved plate 22, it is preferable that the flow guide plate 4 includes an inlet flow guide flat plate section 41, an arc plate section 42, and an outlet flow guide flat plate section 43 connected in this order, in a direction extending from one end of the flow guide chamber near the impeller chamber to one end of the flow guide chamber near the air outlet 5. The plate surface of the inlet diversion straight plate section 41 and the plate surface of the outlet diversion straight plate section 43 are tangent to the plate surface of the arc plate section 42; and the circle center corresponding to the plate surface of the arc plate section 42, the circle center corresponding to the first arc-shaped curved plate 12, and the circle center corresponding to the second arc-shaped curved plate 22 are the same circle center.
Further preferably, as shown in fig. 3, a circumferential straight surface of an impeller in the impeller assembly 6 is taken as a horizontal plane, and the installation positions of the air outlet 5 and the impeller cavity in the horizontal plane are staggered; when the radius corresponding to the side of the arc plate section 42 close to the impeller assembly 6 in the width direction is R1, and the radius corresponding to the side of the arc plate section 42 away from the impeller assembly 6 in the width direction is R2, R1 is less than or equal to R2.
It is also further preferable that the circumferential flat surface of the impeller in the impeller assembly 6 is taken as a horizontal plane; if the included angle between the side of the straight inlet guide plate section 41 close to the impeller assembly 6 in the width direction and the vertical plane is α 1, and the included angle between the side of the straight inlet guide plate section 41 away from the impeller assembly 6 in the width direction and the vertical plane is α 2, then α 1 is greater than or equal to 80 ° and less than or equal to 90 °, for example, but not limited to, α 1 is greater than or equal to 80 ° or 85 ° or 90 ° or other angles greater than or equal to 80 ° and less than or equal to 90 °.
It is also further preferable that the circumferential flat surface of the impeller in the impeller assembly 6 is taken as a horizontal plane; when the angle between a side of the outlet flow guiding flat plate section 43 close to the impeller assembly 6 in the width direction and the horizontal plane is β 1, and the angle between a side of the outlet flow guiding flat plate section 43 away from the impeller assembly 6 in the width direction and the horizontal plane is β 2, then β 1 is 75 ° ≦ β 2 ≦ 90 °, for example, but not limited to, β 1 ≦ β 2 ≦ 75 °, or 80 °, or 85 ° or 90 ° or other angles greater than or equal to 75 ° and less than or equal to 90 °.
The value ranges of the R1 and R2 groups, the value ranges of the α 1 and α 2 groups, and the value ranges of the β 1 and β 2 groups may only satisfy one or two groups, or three groups simultaneously, and preferably, the value ranges of the R1 and R2 groups, the value ranges of the α 1 and α 2 groups, and the value ranges of the β 1 and β 2 groups simultaneously satisfy, at this time, simulation calculation analysis is performed by using a CFD (Computational Fluid Dynamics) simulation technique, and the obtained air flow velocity distribution cloud map inside the air duct is verified, which proves that the flow field structure in the volute diversion cavity of the centrifugal fan is optimized with respect to other satisfying manners.
In addition, referring to fig. 4 and 5, in an alternative embodiment of this embodiment, preferably, the thickness of the inlet flow guiding flat plate section 41 is gradually reduced along a direction extending from the end of the flow guiding cavity close to the impeller cavity to the end of the flow guiding cavity close to the air outlet 5, and with the relative thickness of the inlet flow guiding flat plate section 41 being epsilon, 15% or more and 25% or less, for example, but not limited to, epsilon 15% or 20% or 25% or other relative thicknesses greater than or equal to 15% and less than or equal to 25%, wherein the thickness of the inlet flow guiding flat plate section 41 is gradually reduced to form an airfoil structure, and the relative thickness of the airfoil refers to a ratio of the maximum thickness of the airfoil to the profiled chord length. According to the aerodynamic characteristics of the wing profile, the inlet of the guide plate 4 adopts the wing profile structure design, so that the impact loss caused by high-speed oil smoke flow can be reduced, and the aerodynamic noise is reduced; meanwhile, the guide effect of the guide plate on high-speed oil smoke gas flow under different flow angles can be improved, the working performance of the range hood under different use environments is improved, and the applicability of the guide plate under different operation working conditions is improved.
In addition, in any of the above optional embodiments of this embodiment, it is preferable that the baffle 4 has a plurality of baffles 4, and the baffles 4 are parallel to each other; and/or the guide plate 4 is made of sound-absorbing materials or the guide plate 4 is provided with sound-absorbing holes so as to further reduce the pneumatic noise; wherein, the 'and/or' means that the guide plate 4 has a plurality of structures that the guide plates 4 are parallel to each other, and the structure that the guide plate 4 is made of sound absorbing material or the guide plate 4 is provided with sound absorbing holes is only provided with the former structure, or only provided with the latter structure, or the two structures are simultaneously provided.
Example two
The present embodiment provides a range hood, which includes a centrifugal fan provided in any one of the optional embodiments of the first embodiment. Specifically, referring to fig. 6 and 7 in combination with fig. 1 to 5, the range hood provided by the present embodiment includes a check valve 81, a smoke collecting hood 82, and a motor 83; a sealing ring 84, an air guide ring 85, a filter oil net 86, an oil cup 87 and the centrifugal fan.
Wherein: the specific structure of the centrifugal fan is obtained by referring to each optional or preferred embodiment in the first embodiment; further, the motor 83 is fixed on the upper plate 1, the motor 83 is connected to a rotating shaft of a centrifugal impeller of the impeller assembly 6, the air guide ring 85 is fixed at the position of an upper air inlet of the lower plate 2, and the sealing ring 84 is fixed between the air guide ring 85 and the upper air inlet of the lower plate 2, so that a centrifugal fan system of the range hood is formed; when the range hood is in a working state, the motor 83 drives the centrifugal impeller of the impeller assembly 6 to rotate to do work, so that the centrifugal fan system generates power capable of sucking and exhausting cooking oil fume at the lower part, and the air guide ring 85 guides the oil fume flow to enter the impeller cavity; wherein, the sealing ring 84 plays a sealing role by compressing and filling the gap so as to effectively improve the working performance of the centrifugal fan. The upper end of the oil filtering screen 86 is fixedly connected with the fume collecting hood 82, the lower end of the oil filtering screen 86 is connected with the oil cup 87, the oil cup 87 plays a role in filtering partial oil fume substances in the oil fume flow, reducing oil fume adhesion on parts such as a centrifugal fan system in the range hood and the like, prolonging the service life of the range hood, and the oil cup 87 plays a role in collecting oil fume droplets attached after being filtered by the oil filtering screen 86. At least one of the upper plate 1, the shroud 3 and the lower plate 2 is fixedly connected to the smoke collection hood 82. The check valve 81 is arranged on the smoke collecting cover 82 and is used for connecting a smoke exhaust pipeline; the inlet at the lower end of the check valve 81 is communicated with the air outlet 5 of the centrifugal fan, and the oil fume sucked by the centrifugal fan system is discharged into a fume exhaust pipeline after passing through the check valve 81.
Because the range hood provided by the embodiment includes the centrifugal fan described in the first embodiment, the range hood provided by the embodiment can achieve all the beneficial effects that the centrifugal fan can achieve in the first embodiment, and can be obtained by referring to various optional or preferred embodiments in the first embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (11)
1. A centrifugal fan, its characterized in that: comprises a volute and a guide plate (4);
the volute is provided with a cavity and an air outlet (5) communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet (5); an impeller assembly (6) is arranged in the impeller cavity, and the plane where the air outlet (5) is located is parallel to the circumferential plane of an impeller in the impeller assembly (6);
the guide plate (4) is installed in the guide cavity, the guide plate (4) is bent from the outlet of the impeller cavity to the air outlet (5), and the guide plate (4) divides the guide cavity into a plurality of cavities.
2. The centrifugal fan of claim 1, wherein:
the length direction of the guide plate (4) extends from one end, close to the impeller cavity, of the guide cavity to the direction, extending from one end, close to the air outlet (5), of the guide cavity, and two side edges in the width direction of the guide plate (4) are connected to two opposite side surfaces of the enclosing plate (3) of the volute respectively.
3. The centrifugal fan according to claim 1 or 2, wherein:
the volute comprises an upper plate (1), a lower plate (2) and a surrounding plate (3), wherein the upper plate (1) comprises a first straight panel (11) and a first arc-shaped curved plate (12), one end of the first arc-shaped curved plate (12) is connected with one end of the first straight panel (11), and the surface of the first arc-shaped curved plate (12) is tangent to the surface of the first straight panel (11); the lower plate (2) comprises a second straight panel (21) and a second arc-shaped curved plate (22), one end of the second arc-shaped curved plate (22) is connected with one end of the second straight panel (21), and the surface of the second arc-shaped curved plate (22) is tangent to the surface of the second straight panel (21);
the first straight panel (11) and the second straight panel (21) are parallel to each other, and the circle center corresponding to the first arc-shaped curved plate (12) and the circle center corresponding to the second arc-shaped curved plate (22) are the same circle center; the impeller is characterized in that the impeller cavity is defined by one part of the first straight panel (11), the second straight panel (21) and the coaming (3), and the diversion cavity is defined by the other part of the first arc-shaped curved plate (12), the second arc-shaped curved plate (22) and the coaming (3).
4. The centrifugal fan of claim 3, wherein: the centrifugal fan further comprises an outlet panel (7); the other end of the first arc-shaped curved plate (12), the other end of the second arc-shaped curved plate (22) and one end, far away from the impeller cavity, of the part of the enclosing plate (3) which encloses the diversion cavity are connected to the outlet panel (7); the air outlet (5) is arranged on the outlet panel (7), and the outlet panel (7) is parallel to the circumferential plane of the impeller in the impeller assembly (6).
5. The centrifugal fan of claim 3, wherein: the guide plate (4) comprises an inlet guide straight plate section (41), an arc plate section (42) and an outlet guide straight plate section (43) which are sequentially connected along the direction extending from one end of the guide cavity close to the impeller cavity to one end of the guide cavity close to the air outlet (5);
the plate surface of the inlet flow guide flat plate section (41) and the plate surface of the outlet flow guide flat plate section (43) are tangent to the plate surface of the arc plate section (42); and the circle center corresponding to the plate surface of the arc plate section (42), the circle center corresponding to the first arc-shaped curved plate (12) and the circle center corresponding to the second arc-shaped curved plate (22) are the same circle center.
6. The centrifugal fan of claim 5, wherein: the circumferential straight surface of an impeller in the impeller assembly (6) is taken as a horizontal plane, and the installation positions of the air outlet (5) and the impeller cavity in the horizontal plane are staggered;
when the radius corresponding to the side of the arc plate section (42) close to the impeller assembly (6) in the width direction is R1, and the radius corresponding to the side of the arc plate section (42) far from the impeller assembly (6) in the width direction is R2, R1 is less than or equal to R2.
7. The centrifugal fan of claim 5, wherein: taking the circumferential straight surface of the impeller in the impeller assembly (6) as a horizontal plane; an included angle between one side edge of the inlet guide straight plate section (41) close to the impeller assembly (6) and a vertical surface in the width direction is alpha 1, and an included angle between one side edge of the inlet guide straight plate section (41) far away from the impeller assembly (6) and the vertical surface in the width direction is alpha 2, so that alpha 1 is more than or equal to 80 degrees and alpha 2 is more than or equal to 90 degrees.
8. The centrifugal fan of claim 5, wherein: taking the circumferential straight surface of the impeller in the impeller assembly (6) as a horizontal plane; an included angle between one side edge of the outlet flow guide straight plate section (43) close to the impeller assembly (6) in the width direction and the horizontal plane is beta 1, and an included angle between one side edge of the outlet flow guide straight plate section (43) far away from the impeller assembly (6) in the width direction and the horizontal plane is beta 2, so that beta 1 is larger than or equal to 75 degrees and smaller than or equal to beta 2, and the included angle is smaller than or equal to beta 2.
9. The centrifugal fan of claim 5, wherein: along the direction that the one end that is close to in the water conservancy diversion chamber is to the one end extension of water conservancy diversion chamber that is close to air outlet (5), the thickness of import water conservancy diversion straight plate section (41) reduces gradually, and with the relative thickness of import water conservancy diversion straight plate section (41) is epsilon, then epsilon is more than or equal to 15% ≦ 25%.
10. The centrifugal fan according to claim 1 or 2, wherein: the guide plate (4) is provided with a plurality of guide plates (4), and the guide plates (4) are parallel to each other;
and/or the guide plate (4) is made of sound-absorbing materials or a sound-absorbing hole is formed in the guide plate (4).
11. A range hood, its characterized in that: comprising a centrifugal fan according to any of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021572118.9U CN212690391U (en) | 2020-07-31 | 2020-07-31 | Centrifugal fan and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021572118.9U CN212690391U (en) | 2020-07-31 | 2020-07-31 | Centrifugal fan and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212690391U true CN212690391U (en) | 2021-03-12 |
Family
ID=74901626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021572118.9U Active CN212690391U (en) | 2020-07-31 | 2020-07-31 | Centrifugal fan and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212690391U (en) |
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2020
- 2020-07-31 CN CN202021572118.9U patent/CN212690391U/en active Active
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