CN110857790A - Range hood with current collector - Google Patents

Range hood with current collector Download PDF

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Publication number
CN110857790A
CN110857790A CN201810969628.0A CN201810969628A CN110857790A CN 110857790 A CN110857790 A CN 110857790A CN 201810969628 A CN201810969628 A CN 201810969628A CN 110857790 A CN110857790 A CN 110857790A
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Prior art keywords
impeller
current collector
air
air guide
section
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CN201810969628.0A
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Chinese (zh)
Inventor
何立博
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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Priority to CN201810969628.0A priority Critical patent/CN110857790A/en
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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
    • F24C15/2021—Arrangement or mounting of control or safety systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a range hood with a current collector, which comprises a volute, an impeller and the current collector, wherein the current collector is provided with an annular air guide surface which is formed by enclosing at least two arc sections, the middle of the air guide surface is provided with a ventilation opening of which the central axis is superposed with a rotating shaft of the impeller, the cross section of the air guide surface along the axial direction of the impeller is presented as an air guide line section AB, the air guide line section AB comprises a first air guide section AD far away from the impeller end and a second air guide section DB near the impeller end, and the second air guide section DB is a Bessel curve and is in smooth transition with the first air guide. The Bezier curve can guide the airflow, partially changes the angle of attack of the airflow subsequently entering the impeller, and increases the width of the area flowing into the impeller in the axial direction of the impeller, so that the overall speed of the airflow after the airflow leaves the impeller is reduced, the backflow is reduced, the inlet impact is reduced, and the noise is reduced; the Bezier curve enables the wall surface of the air guide surface to be smooth, and the coanda effect of the smooth wall surface of the current collector can reduce air flow loss caused by gaps.

Description

Range hood with current collector
Technical Field
The invention relates to a range hood, in particular to a range hood with a flow collector.
Background
In order to improve the air inflow condition, improve the working efficiency of the fan and reduce the noise, a current collector is usually arranged at the inlet of the fan, and the current collector is used for smoothly guiding the fluid to an impeller. The current collector can effectively improve the performance of the fan, the flow of the fan is large, and the fan works under the designed working condition, so that the noise value is low.
The current collector is usually designed into a circular arc shape, for example, the chinese utility model patent with application number 201220095994.6 (publication number CN202468384U) discloses a centrifugal oil smoke purifying fan, which comprises a volute with an air inlet and an air outlet, an air inlet collector corresponding to the air inlet is arranged on one side of the volute, the volute is a logarithmic spiral of an equilateral base circle method, and the air inlet collector is arranged in an arc shape and correspondingly mounted on a front side plate of the volute.
As another example, in the chinese patent application No. 201710318907.6 (application publication No. CN107965471A) previously applied by the present applicant, the present invention provides a collector and a centrifugal fan using the same, where the collector includes an air guide surface and a fixed surface, the air guide surface includes a radial air guide surface extending from a radial inner side of the fixed surface in a radial direction by a certain distance, and an axial air guide surface extending from a radial inner side of the radial air guide surface in an axial direction by a certain distance, an air inlet is formed in the middle of the air guide surface, the axial air guide surface includes a straight first air guide section and a circular arc-shaped second air guide section, and the first air guide section and the second air guide section form a closed ring shape. The current collector increases the buffer space for the impact of oil smoke gas flow, but when the oil smoke gas flow enters, the oil smoke gas flow needs to directly flow through the radial air guide surface by the axial air guide surface to enter the air inlet and flow into the impeller, and at the moment, the oil smoke gas flow can pass through a large turn after entering the impeller, so that the impact is large.
As shown in fig. 8 and 9, a wind guiding line segment a ' C ' formed by a cross section of a wind guiding surface 33 ' of the conventional collector along an axial direction of the impeller includes a circular arc segment curve a ' B ' and a straight line segment B ' C ', where the straight line segment B ' C ' is close to the impeller, and the collector is applied to the range hood, as shown in fig. 10, a large gap I ' exists between the impeller and the straight line segment B ' C ' of the collector, which causes leakage of the oil smoke gas flow, and the structure of the collector makes a flow area of the gas flow flowing into the impeller narrow along the axial direction of the impeller, so that the gas flow velocity flowing out of blades of the impeller is large, which causes backflow, and the backflow passes through the gap I ' and further impacts the oil smoke gas flow at an inlet, which causes oil smoke loss. In addition, with the adoption of the current collector structure, when oil fume flows through the current collector, the oil fume can pass through a large turn and then enter a subsequent impeller, so that large impact is caused.
Therefore, further improvements to existing current collectors are needed.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a range hood with a current collector, which reduces the impact on the impeller inlet by partially changing the angle of attack after the oil fume flows into the impeller so that the oil fume flow is smoothly and stably flowed to the impeller.
The second technical problem to be solved by the present invention is to provide a range hood with a collector, which reduces the gap between the air outlet end of the second air guiding section and the impeller to reduce the flow loss of the oil smoke flow, in view of the current situation of the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood with current collector, including spiral case and the impeller of setting in the spiral case, the air intake department of spiral case is provided with and leads to the air current collector of impeller, the current collector has and encloses synthetic annular wind-guiding surface by two sections at least arcs, and has the vent of central axis and impeller pivot coincidence in the middle of the wind-guiding surface, its characterized in that: the cross section of the air guide surface along the axial direction of the impeller is presented as an air guide line section AB, the air guide line section AB comprises a first air guide section AD far away from the impeller end and a second air guide section DB near the impeller end, and the second air guide section DB is a Bessel curve and is in smooth transition with the first air guide section AD.
The first air guiding section AD adopts one of the structural forms: the first air guiding section AD is a Bezier curve connected with the second air guiding section DB.
In order to reduce the flow loss of the oil smoke gas flow, the initial point A of the wind guide line segment AB is the coordinate origin PAThe end point B coordinate is PB，PBIs composed of
Figure BDA0001775805100000021
W/w∈[1.05,1.4]And the coordinate of the control point T on the wind guide line segment AB is PtThe coordinate of the point C on the wind guide line segment AB is PC，PCHas the coordinates of
Figure BDA0001775805100000022
The Bessel curve of the wind guide line segment AB meets B(s) ═ 1-s2PA+2s(1-s)Pc+s2PB，s∈[0,1]Wherein, one side of the oil smoke flowing out of the ventilation opening is an air outlet end of the current collector, one side of the oil smoke flowing into the ventilation opening is an air inlet end of the current collector, D2Diameter of air outlet end of the collector, D1The diameter of the air inlet end of the current collector is W, the projection width of the volute in the axial direction of the impeller is W, the total length of the impeller blades in the axial direction is W, and I is the sum of the gap between the rear end face of the second air guide section DB and the front end face of the impeller and the gap between the rear end face of the volute and the rear end face of the impeller. Therefore, the wall-attached airflow brought by the coanda effect of the smooth wall surface on the air guide surface of the current collector is utilized to reduce the flow loss caused by the gap, and the position of the control point can be adjusted to realize the control of the air outlet end of the current collector, namely the direction of the rear end part of the current collector, thereby partially changing the attack angle of the airflow after the airflow enters the impeller.
The position of control point T may be defined by both end point B coordinate and included angle α, or may be defined in other ways, and is preferably defined by included angles α and DtDefined collectively as α ∈ [0,50 °]，Dt/D2∈[0.85,1]α is the included angle between the tangent of the wind guide surface of the collector and the axial direction of the impeller, the control point T is the tangent point of the tangent, DtIs the diameter of the circle on which the control point T lies. Like this, can turn into the air intake region of impeller blade in advance with the air current better, and then make follow-up regional width that flows into in the impeller increase, in addition, regional width increase makes the whole speed difference of the oily flue gas stream behind the impeller blade diminish, and the backward flow further reduces, and then has reduced the impact of entrance end air current, loss reduction, noise abatement.
The first air guiding section AD adopts a second structure form: the first air guide section AD is a straight line section. Thus, the die is convenient to process.
In order to reduce the flow loss of the oil smoke gas flow, the starting point A of the first wind guide section AD is a coordinate origin, and the starting point D of the second wind guide section DB is a coordinate PD，PDIs (Lcos β, Lsin β), W/W epsilon [1.05,1.4 ∈]The end point B coordinate is PB，PBIs composed of
Figure BDA0001775805100000031
The coordinate of the control point T on the second air guide section DB is PtThe coordinate of the point C on the second wind guide section DB is PC，PCHas the coordinates of
Figure BDA0001775805100000032
The curve of the second wind guiding section DB satisfies B(s) ═ 1-s2PD+2s(1-s)Pc+s2PB，s∈[0,1]Wherein, L is the length of first wind-guiding section AD, β is the contained angle between first wind-guiding section AD and the impeller axial direction, and the one side that flows in its vent is the air outlet end of collector at one side that the oil smoke flows out the vent, and the one side that flows in its vent is the air inlet end of collector, D2Diameter of air outlet end of the collector, D1The diameter of the air inlet end of the current collector is W, the projection width of the volute in the axial direction of the impeller is W, the total length of the impeller blades in the axial direction is W, and I is the sum of the gap between the rear end face of the second air guide section DB and the front end face of the impeller and the gap between the rear end face of the volute and the rear end face of the impeller.
The position of control point T may be defined by both end point B coordinate and included angle α, or may be defined in other ways, and is preferably defined by included angles α and DtDefined collectively as α ∈ [0,50 °]，Dt/D2∈[0.85,1]Wherein α is the included angle between the tangent of the second wind guide section and the axial direction of the impeller, the control point T is the tangent point of the tangent, DtIs the diameter of the circle on which the control point T lies.
The present invention is directed to solving the second technical problemThe technical scheme is as follows: one side of the oil smoke outflow vent is provided with an air outlet end of a current collector, and the diameter D of the air outlet end of the current collector2Outer diameter R of impeller1In a relationship of
Figure BDA0001775805100000033
In order to reduce the backflow of the oil smoke gas flow in the impeller, the projection length H of the wind guide line segment AB in the axial direction of the impeller and the outer diameter R of the impeller1In a relationship of
Figure BDA0001775805100000034
Therefore, the problem that the thickness of the volute is generally larger than that of the impeller so as to easily cause leakage and backflow at the air outlet end of the current collector is solved, and meanwhile, the current collector protrudes out of the volute to guide the airflow, so that the airflow can conveniently enter the axial direction of the impeller.
In order to reduce the airflow impact at the inlet end of the current collector, the air inlet end of the current collector is arranged at one side of the ventilation opening where the oil fume flows, and the diameter D of the air inlet end of the current collector1Outer diameter R of impeller1In a relationship of
Figure BDA0001775805100000041
Therefore, the impeller has better flow guide effect under the condition of considering the design basic size of the impeller, the impact of airflow entering a current collector area due to the existence of a box body (a shell of a common range hood) is reduced, if the value is less than 1.9, the inlet throttling is easily caused, and when the value is more than 2.1, the outward convex part of the air guide surface of the air inlet end of the current collector expands and forms a circle of low-pressure area with the volute area, so that the outward convex part of the air inlet end of the current collector induces the separation of backflow gas in the volute.
Compared with the prior art, the invention has the advantages that: the air guide line segment AB of the current collector of the range hood with the current collector comprises a first air guide section AD far away from an impeller end and a second air guide section DB near the impeller end, wherein the second air guide section DB is a Bezier curve and is in smooth transition with the first air guide section AD, the Bezier curve can guide air flow, and can partially change the angle of attack of the air flow entering the impeller subsequently, namely the oil fume can flow into the impeller more stably through the current collector, so that the air flow can turn into the inlet area of the impeller in advance, the width of the area flowing into the impeller in the axial direction of the impeller is increased, and the whole speed of the oil fume flow flowing out of the impeller is reduced due to the increase of the width of the area flowing into the impeller; in addition, collector air outlet end diameter and impeller external diameter's design has reduced the clearance between impeller front end and the second wind guide section exit end, and simultaneously, the Bezier curve makes the wall of wind-guiding surface smooth, utilizes the coanda effect of the smooth wall of collector to reduce the oily gas stream loss that the clearance brought, and in addition, the increase of regional width still can make the air velocity of the air current that flows through the clearance reduce, has reduced the backward flow promptly, and then has reduced the impact of entrance end air current, reduces the air current loss, and the noise reduction.
Drawings
Fig. 1 is a schematic structural view of a centrifugal fan according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a current collector according to a first embodiment of the present invention;
fig. 3 is a cross-sectional view of a current collector according to a first embodiment of the present invention;
fig. 4 is a cross-sectional view of a current collector according to a first embodiment of the present invention;
fig. 5 is a sectional view of a part of the structure of a range hood according to a first embodiment of the present invention;
fig. 6 is a cross-sectional view of a range hood according to a first embodiment of the present invention;
fig. 7 is a cross-sectional view of a current collector according to a second embodiment of the present invention;
FIG. 8 is a cross-sectional view of a current collector of the prior art;
fig. 9 is a schematic view of the collector type line of fig. 8;
fig. 10 is a sectional view of a part of the structure of a range hood in the prior art.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows:
as shown in fig. 1 to 6, a first embodiment of the present invention is shown. The collector 3 is mainly used for a centrifugal fan of a range hood and can also be used for an axial flow fan of the range hood.
As shown in fig. 1, the centrifugal fan of the present embodiment includes a volute 1, an impeller 2 disposed in the volute 1, and a collector 3, wherein the collector 3 is disposed at an air inlet on a front side of the volute 1 and is coaxial with the impeller 2. When the impeller 2 rotates, air in the volute 1 is discharged out of the volute 1 through the air outlet arranged at the volute 1, negative pressure is formed inside the volute 1, and oil smoke enters the volute 1 through the collector 3 under the action of the negative pressure and then is discharged to a common flue or is discharged out of a room under the action of the impeller 2.
As shown in fig. 2 and 3, the collector 3 includes a fixing surface 32 and an air guiding surface 33, wherein the fixing surface 32 for fixing with the scroll casing 1 is disposed on the outer side of the air guiding surface 33 in the circumferential direction of the collector, the fixing surface 32 is annular, and the cross section of the fixing surface along the axial direction of the impeller 2 is a straight line segment EA, and in this embodiment, the collector 3 is installed at the air inlet on the front side of the scroll casing 1 through the fixing surface 32.
The air guide surface 33 is of an annular structure formed by enclosing at least two arc-shaped sections, the middle of the annular air guide surface is provided with a vent 31 of which the central axis is coincident with the rotating shaft of the impeller 2, the cross section of the air guide surface 33 along the axial direction of the impeller 2 is presented as an air guide section AB, the air guide section AB comprises a first air guide section AD far away from the impeller end and a second air guide section DB close to the impeller end, the second air guide section DB is a Bezier curve and is in smooth transition with the first air guide section AD, the first air guide section AD is a Bezier curve connected with the second air guide section DB, and the air guide section AB is a Bezier curve. The air guide surface 33 may be circular, elliptical, or an annular structure surrounded by other arc-shaped sections.
As shown in fig. 1 and fig. 2, the air inlet 311 of the current collector 3 is located on the side where the oil smoke gas flows into the ventilation opening 31, and the air outlet 312 of the current collector 3 is located on the side where the oil smoke flows out of the ventilation opening 31, wherein the diameter D of the air outlet of the current collector is2Outer diameter R of impeller1In a relationship of
Figure BDA0001775805100000051
The design of the diameter of the air outlet end enables the air outlet end 312 of the current collector 3, namely the Bezier curve part of the rear end part of the current collector 3, to change the attack angle of the air flow after the air flow enters the impeller 2, so that the air flow turns into the inlet area of the impeller 2 in advance, and the air flow loss caused by gap leakage is reduced. In addition, if the value is less than 1.3, leakage between the current collector 3 and the impeller 2 is easily caused, and if the value is greater than 1.7, the requirement on the dynamic balance of the impeller 2 is high, and the current collector 3 and the impeller 2 are easily rubbed and collided in the operation process.
Diameter D of air inlet end of current collector1Outer diameter R of impeller1In a relationship of
Figure BDA0001775805100000052
Therefore, a better flow guide effect is ensured under the condition of considering the basic size of the impeller design, the impact of airflow entering a current collector 3 area caused by the existence of a box body (the front section of a common range hood is provided with an air box shell) is reduced, if the value is less than 1.9, the inlet throttling is easily caused, and when the value is more than 2.1, the convex part of the air inlet end 311 of the current collector 3 is expanded outwards and forms a circle of low-pressure area with the volute 1 area, so that the convex part of the air inlet end 311 of the current collector 3 is easily caused to induce the separation of backflow gas in the volute 1.
In addition, the projection length H of the air guide curve AB in the axial direction of the impeller 2 and the outer diameter R of the impeller 21In a relationship of
Figure BDA0001775805100000061
The problem of the volute 1 thickness size generally big than impeller 2 thickness size and cause the leakage and the backward flow of collector 3 air outlet end 312 easily is solved, simultaneously, collector 3 protrusion volute 1 height, and it is convenient for the air current to get into the axial direction of impeller 2 from the bellows casing to guide the air current.
As shown in fig. 3 and 4, the starting point a of the wind guide line segment AB is the origin of coordinates PAThe end point B coordinate is PBWherein P isBIs composed of
Figure BDA0001775805100000062
W/w∈[1.05,1.4]W is the projection width of the volute along the axial direction of the impeller, W is the total length of the impeller blades 23 along the axial direction, I is the sum of the gap between the rear end face of the second air guide section DB and the front end face of the impeller and the gap between the rear end face of the volute and the rear end face of the impeller, and the coordinate of a control point T on the air guide section AB is PtThe coordinate of the point C on the wind guide line segment AB is PC，PCHas the coordinates ofThe curve of the wind guide line segment AB meets B(s) ═ 1-s2PA+2s(1-s)Pc+s2PB，s∈[0,1]. The impeller 2 includes a front end ring 21 and a rear end ring 22, two ends of the impeller blades 23 are respectively mounted on the front end ring 21 and the rear end ring 22, and the total length w of the impeller blades 23 is the axial distance between the front end ring 21 and the rear end ring 22.
There are various ways to define the position of control point, and in this embodiment, the position of control point T is defined by included angles α and DtDefined collectively as α ∈ [0,50 °]，Dt/D2∈[0.85,1]α is the included angle between the tangent of wind guide segment AB and the axial direction of the impeller, and control point T is the tangent point of the tangenttIs the diameter of the circle on which the control point T lies.
As shown in fig. 6, the second air guiding section DB adopts a bezier curve, so that a gap between the air outlet end 312 of the current collector 3 and the impeller 2 is reduced, and a flow loss of oil smoke is reduced, and at the same time, the angle of attack of the bezier curve to the air flow, which subsequently enters the impeller 2, can be partially changed, so that the air flow turns into an inlet region of the impeller 2 in advance, and further, a region width M, which subsequently enters the impeller 2, is increased, wherein the region width M is a width in the axial direction of the impeller 2, and further, the region width M is increased, so that an overall speed difference of the oil smoke flow after flowing out of the impeller blades 23 is reduced, and backflow is further reduced, and the air flow cannot directly flow out of the front end ring 21 of the impeller 2 through the gap between the air outlet end 312 and the impeller 2 due to the surrounding and inducing of the bezier curve, and further, impact on the air flow at the front, the loss is reduced, the noise is reduced, and the efficiency is improved. Wherein the direction of the arrow is the flow direction of the air flow.
Example two:
fig. 7 shows a second embodiment of the present invention. This embodiment differs from the above embodiment in that: the first air guide section AD adopts a straight line section, so that the processing of the die is facilitated.
The coordinate of the starting point D of the second air guide section DB connected with the first air guide section AD is PDThe end point B coordinate is PB，PBIs composed of
Figure BDA0001775805100000071
W is the projection width of the volute along the axial direction of the impeller, W is the total length of the impeller blades 23 along the axial direction, and W/W is equal to [1.05,1.4 ]]The I is the sum of the clearance between the rear end surface of the second air guide section DB and the front end surface of the impeller and the clearance between the rear end surface of the volute and the rear end surface of the impeller, and the coordinate of a control point T on the second air guide section DB is PtThe coordinate of the point C on the second wind guide section DB is PC，PCHas the coordinates of
Figure BDA0001775805100000072
The curve of the second wind guiding section DB satisfies B(s) ═ 1-s2PD+2s(1-s)Pc+s2PB，s∈[0,1]In the present embodiment, the position of control point T is defined by angles α and DtDefined together, wherein α is the included angle between the tangent line of the second wind guide section DB and the axial direction of the impeller, the control point T is the tangent point of the tangent line, α epsilon [0,50 DEG ]]，DtTo control the diameter of the circle on which the point T lies, Dt/D2∈[0.85,1]。
In this embodiment, the first air guiding section AD has a coordinate origin a, an included angle formed between the first air guiding section AD and the axial direction of the impeller 2 is β, a coordinate of a starting point D of the second air guiding section DB is defined by β and a length L of the first air guiding section AD, and P is defined by PDIs (Lcos β, Lsin β).

Claims (10)

1. The utility model provides a range hood with current collector, including spiral case and the impeller of setting in the spiral case, the air intake department of spiral case is provided with and leads to the air current collector of impeller, the current collector has and encloses synthetic annular wind-guiding surface by two sections at least arcs, and has the vent of central axis and impeller pivot coincidence in the middle of the wind-guiding surface, its characterized in that: the cross section of the air guide surface along the axial direction of the impeller is presented as an air guide line section AB, the air guide line section AB comprises a first air guide section AD far away from the impeller end and a second air guide section DB near the impeller end, and the second air guide section DB is a Bessel curve and is in smooth transition with the first air guide section AD.
2. The range hood with a current collector of claim 1, wherein: the first air guiding section AD is a Bezier curve connected with the second air guiding section DB.
3. The range hood with a current collector of claim 2, wherein: the initial point A of the wind guide line segment AB is a coordinate origin PAThe end point B coordinate is PB，PBIs composed of
Figure FDA0001775805090000011
W/w∈[1.05,1.4]And the coordinate of the control point T on the wind guide line segment AB is PtThe coordinate of the point C on the wind guide line segment AB is PC，PCHas the coordinates ofThe Bessel curve of the wind guide line segment AB meets B(s) ═ 1-s2PA+2s(1-s)Pc+s2PB，s∈[0,1]Wherein, one side of the oil smoke flowing out of the ventilation opening is an air outlet end of the current collector, one side of the oil smoke flowing into the ventilation opening is an air inlet end of the current collector, D2Diameter of air outlet end of the collector, D1Is the diameter of the air inlet end of the current collector, W is the projection width of the volute along the axial direction of the impeller, W is the total length of the impeller blade along the axial direction, and I is the clearance between the rear end face of the second air guide section DB and the front end face of the impeller and the voluteThe sum of the gaps between the rear end face of the shell and the rear end face of the impeller.
4. The range hood with current collector of claim 3, wherein the control point T is defined by included angles α and DtDefined collectively as α ∈ [0,50 °]，Dt/D2∈[0.85,1]α is the included angle between the tangent of the wind guide surface of the collector and the axial direction of the impeller, the control point T is the tangent point of the tangent, DtIs the diameter of the circle on which the control point T lies.
5. The range hood with a current collector of claim 1, wherein: the first air guide section AD is a straight line section.
6. The range hood with a current collector of claim 5, wherein: the starting point A of the first air guide section AD is a coordinate origin, and the starting point D of the second air guide section DB is a coordinate PD，PDIs (Lcos β, Lsin β) and the endpoint B coordinate is PB，PBIs composed of
Figure FDA0001775805090000013
W/w∈[1.05,1.4]The coordinate of the control point T on the second wind guide section DB is PtThe coordinate of the point C on the second wind guide section DB is PC，PCHas the coordinates of
Figure FDA0001775805090000021
The curve of the second wind guiding section DB satisfies B(s) ═ 1-s2PD+2s(1-s)Pc+s2PB，s∈[0,1]Wherein, L is the length of first wind-guiding section AD, β is the contained angle between first wind-guiding section AD and the impeller axial direction, and the one side that flows in its vent is the air outlet end of collector at one side that the oil smoke flows out the vent, and the one side that flows in its vent is the air inlet end of collector, D2Diameter of air outlet end of the collector, D1Is the diameter of the air inlet end of the current collector, W is the projection width of the volute along the axial direction of the impeller, and W is the bladeThe total length of the impeller blades in the axial direction is I, which is the sum of the gap between the rear end surface of the second air guiding section DB and the front end surface of the impeller and the gap between the rear end surface of the volute and the rear end surface of the impeller.
7. The range hood with current collector of claim 6, wherein the control point T is defined by included angles α and DtDefined collectively as α ∈ [0,50 °]，Dt/D2∈[0.85,1]Wherein α is the included angle between the tangent of the second wind guide section and the axial direction of the impeller, the control point T is the tangent point of the tangent, DtIs the diameter of the circle on which the control point T lies.
8. The range hood with a current collector of any one of claims 1 to 7, wherein: one side of the oil smoke outflow vent is provided with an air outlet end of a current collector, and the diameter D of the air outlet end of the current collector2Outer diameter R of impeller1In a relationship of
Figure FDA0001775805090000022
9. The range hood with a current collector of claim 8, wherein: the projection length H of the air guide line segment AB in the axial direction of the impeller and the outer diameter R of the impeller1In a relationship of
10. The range hood with a current collector of claim 8, wherein: the side of the oil fume flow flowing into the ventilation opening is provided with an air inlet end of a current collector, and the diameter D of the air inlet end of the current collector1Outer diameter R of impeller1In a relationship of
CN201810969628.0A 2018-08-23 2018-08-23 Range hood with current collector Pending CN110857790A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113107898A (en) * 2021-04-30 2021-07-13 广东美的厨房电器制造有限公司 Blade for centrifugal fan, impeller, centrifugal fan and household appliance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113107898A (en) * 2021-04-30 2021-07-13 广东美的厨房电器制造有限公司 Blade for centrifugal fan, impeller, centrifugal fan and household appliance

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