CN110857791A - Range hood with current collector - Google Patents
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- CN110857791A CN110857791A CN201810969631.2A CN201810969631A CN110857791A CN 110857791 A CN110857791 A CN 110857791A CN 201810969631 A CN201810969631 A CN 201810969631A CN 110857791 A CN110857791 A CN 110857791A
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- impeller
- current collector
- range hood
- air
- air guide
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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)
- 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 a wind guide surface, the middle of the wind guide surface is provided with a vent with a central axis coincident with a rotating shaft of the impeller, the cross section of the wind guide surface along the axial direction of the impeller is a wind guide line segment AC, the wind guide line segment AC comprises a first wind guide section AB far away from the impeller end and a second wind guide section AC close to the impeller end, and the second wind guide section BC is a logarithmic spiral line and is in smooth transition with the first wind guide section AB. Adopt the logarithm helix to make impeller import impact further reduce, reduced the oil smoke loss of flowing, can partially change the subsequent attack angle that gets into the impeller of air current simultaneously so that the air current turns into the inlet region of impeller in advance, and then make the subsequent regional width that flows into in the impeller increase, in addition, regional width increase can make the whole speed of the oil smoke gas stream behind the impeller blade diminish, and the backward flow further reduces, and then has reduced the impact noise reduction of entrance end air current.
Description
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 the current collector of leading-in the impeller of air current, the current collector has and encloses synthetic annular wind-guiding surface by at least two sections arcs, have the vent of central axis and the coincidence of the pivot of impeller 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 segment AC, the air guide line segment AC comprises a first air guide section AB far away from the impeller end and a second air guide section BC close to the impeller end, and the second air guide section BC is a logarithmic spiral line and is in smooth transition with the first air guide section AB.
The first wind guiding section AB adopts one of the structural forms: the first air guide section AB is a logarithmic spiral. In this way, the impact of the air flow at the inlet end of the collector can be reduced.
In order to better adapt to the working condition range of large flow, the air guide line segment AC is an angle-variable logarithmic spiral line with the expansion angle gradually enlarged or the expansion angle gradually reduced.
To reduce oilThe flow loss of the flue gas flow, and the polar radius R of the wind guide line segment AC is defined as
Variable helical expansion angle
λ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，λ1≠λ2，
Is the wrap angle of the air guide line segment AC,
R1is the outer diameter of the impeller, r e [ -5, 5 [ ]]And r ≠ 1, s is an adjustment coefficientθ0The starting angle of the point A of the air guide line segment AC is theta, and the polar coordinate angle variable of any point on the air guide line segment AC is theta. Like this, the wind-guiding line section adopts the logarithm helix to reduce the oil smoke loss that flows, the direction of logarithm helix to the air current simultaneously, can partially change the subsequent attack angle that gets into the impeller of air current, thereby let the air current turn round the inlet region of impeller in advance, and then make the subsequent regional width that flows in into in the impeller increase, in addition, regional width increases the whole speed difference that makes the oil smoke gas stream behind the impeller blade diminish, the backward flow further reduces, and then the impact of entrance point air current has been reduced, loss reduction, noise abatement.
The first air guiding section AB adopts a second structure form: the first air guide section AB is a straight line section. Thus, the die is convenient to process.
The polar radius R of the second wind guide section BC is defined as
Variable helical expansion angle
λ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，
Is the wrap angle of the second wind guiding section BC,
R1is the outer diameter of the impeller, r e [ -5, 5 [ ]]And r ≠ 1, s is an adjustment coefficient
θ0The starting angle of a point B of the second wind guiding segment BC is θ, which is a polar coordinate angle variable of an arbitrary point on BC.
The technical scheme adopted by the invention for solving the second technical problem is as follows: one side of the oil fume flow flowing out of the ventilation opening is provided with an air outlet end of the current collector, and the diameter D of the air outlet end of the current collector2Outer diameter R of impeller1In a relationship of
In order to reduce the backflow of the oil smoke gas flow in the impeller, the projection length H of the air guide curve AB in the axial direction of the impeller is in relation to the outer diameter R1 of the impeller
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 oil fume flow flowing into the ventilation opening, and the diameter of the air inlet end of the current collectorD1Outer diameter R of impeller1In a relationship ofTherefore, 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.
As another preferable mode, the wind guide line segment AC is an equiangular logarithmic spiral with equal divergence angles.
In order to facilitate the installation of the current collector, a fixing surface for fixing the current collector with the volute is arranged on the outer side of the circumferential direction of the air guide surface of the current collector.
Compared with the prior art, the invention has the advantages that: the air guide line segment AC of the current collector of the range hood with the current collector comprises a first air guide section AB far away from the impeller end and a second air guide section BC near the impeller end, wherein the second air guide section BC is a logarithmic spiral line and is in smooth transition with the first air guide section AB; meanwhile, the second air guide section adopts a logarithmic spiral to reduce the oil fume flow loss, and the logarithmic spiral guides the air flow, so that the angle of attack of the air flow entering the impeller subsequently can be partially changed, namely the oil fume flow can more stably flow into the impeller 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 increase of the width of the area flowing into the impeller can reduce the overall speed of the oil fume flow flowing out of the impeller blades; in addition, due to the design of the diameter of the air outlet end of the current collector and the outer diameter of the impeller, the gap between the front end of the impeller and the outlet end of the second air guide section is reduced, so that the speed of airflow flowing out through the gap is reduced, namely, backflow is reduced, the impact of airflow at the inlet end is reduced, the airflow loss is reduced, and the noise is reduced.
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 AD.
The wind guide surface 33 is of an annular structure formed by enclosing at least two arc-shaped sections, the middle of the annular wind guide surface is provided with a vent 31 with a central axis coincident with the rotating shaft of the impeller 2, the cross section of the wind guide surface 33 in the axial direction of the impeller 2 is presented as a wind guide line section AC, the wind guide line section AC comprises a first wind guide section AB far away from the impeller end and a second wind guide section BC close to the impeller end, the second wind guide section BC is a logarithmic spiral line, and the second wind guide section BC and the first wind guide section AB are in smooth transition. The air guide surface 33 may be circular, elliptical, or an annular structure surrounded by other arc-shaped sections.
As shown in fig. 3 and 4, the first air guiding section AB and the second air guiding section BC are both logarithmic spirals, and in order to better adapt to the working condition range of wide flow, the whole air guiding section AC is an angle-variable logarithmic spiral with gradually enlarged or reduced expansion angle, and the polar radius R of the air guiding section AC is defined as
Wherein the variable spiral expansion angle
λ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，λ1≠λ2，
Is the wrap angle of the air guide line segment AC,
R1is the outer diameter of the impeller 2, r e-5, 5]And r ≠ 1, s is an adjustment coefficient
θ0The starting angle of the point A of the air guide line segment AC is theta, and the polar coordinate angle variable of any point on the air guide line segment AC is theta. In addition, if only under a certain low-flow working condition, the first air guiding section AB can also adopt an equiangular logarithmic spiral with the same divergence angle, and at this time, the lambda is1＝λ2。
In this embodiment, as shown in fig. 6, the second air guiding section BC adopts a logarithmic spiral, a gap between the air outlet end 312 of the collector 3 and the impeller 2 is reduced, oil smoke flow loss is reduced, and meanwhile, the logarithmic spiral guides the air flow, and the angle of attack of the air flow entering the impeller 2 subsequently can be partially changed, so that the air flow turns into the inlet region of the impeller 2 in advance, and further the region width W flowing into the impeller 2 subsequently is increased, wherein the region width W is the width in the axial direction of the impeller 2, in addition, the region width W is increased, so that the overall speed difference of the oil smoke flow flowing out of the blades of the impeller 2 is reduced, the backflow is further reduced, and further, the impact of the air flow at the air inlet in front of the volute 1 is reduced, the loss is reduced, and the noise is. Wherein the direction of the arrow is the flow direction of the air flow.
As shown in fig. 1 and 2, one side of the oil smoke gas flow flowing into the ventilation opening 31 is an air inlet end 311, one side of the oil smoke flow flowing out of the ventilation opening 31 is an air outlet end 312, and the diameter D of the air outlet end 312 of the current collector 3 is2Outer diameter R of impeller 21In a relationship of
The design of the diameter of the air outlet end enables the spiral line part of the air outlet end 312 of the current collector 3 to change the attack angle of the air flow after the air flow enters the impeller 2, the air flow turns into the inlet area of the impeller 2 in advance, and the air flow loss caused by clearance 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 311 of current collector 31Outer diameter R of impeller 21In a relationship of
The design ensures better flow guide effect under the condition of considering the basic size of the impeller design, reduces the impact of airflow entering the 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 casing), easily causes inlet throttling if the value is less than 1.9, and easily causes the outward convex part of the air inlet end 311 of the current collector 3 to expand and form a circle of low-pressure area with the volute 1 area when the value is more than 2.1, thus easily causing the outward convex part of the air inlet end 311 of the current collector 3 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
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 gets into the axial direction of impeller 2 from the box for the convenience of air current to guide the air current.
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 AB adopts a straight line section, so that the processing of the die is facilitated. The polar radius R of the second wind guide section BC connected with the first wind guide section AB is defined as
Variable helical expansion angleλ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，
Is the wrap angle of the second wind guiding section BC,R1is the outer diameter of the impeller, r e [ -5, 5 [ ]]And r ≠ 1, s is an adjustment coefficient
θ0The starting angle of the point B of the second wind guiding section BC is θ, which is a polar coordinate angle variable of any point on the second wind guiding section BC. Wherein, when lambda1≠λ2The second wind guiding section BC is an angle-variable logarithmic spiral with gradually enlarged or reduced expansion angle, when lambda is1＝λ2And the second wind guiding section BC is an equiangular logarithmic spiral.
Claims (11)
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 segment AC, the air guide line segment AC comprises a first air guide section AB far away from the impeller end and a second air guide section BC close to the impeller end, and the second air guide section BC is a logarithmic spiral line and is in smooth transition with the first air guide section AB.
2. The range hood with a current collector of claim 1, wherein: the first air guide section AB is a logarithmic spiral.
3. The range hood with a current collector of claim 2, wherein: the wind guide line segment AC is an angle-variable logarithmic spiral with gradually enlarged or gradually reduced expansion angle.
4. The range hood with current collector of claim 3, wherein the range hood is characterized byIn the following steps: the polar radius R of the wind guide line segment AC is defined as
Variable helical expansion angleλ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，λ1≠λ2， 
Is the wrap angle of the air guide line segment AC,
R1is the outer diameter of the impeller, r e [ -5, 5 [ ]]And r ≠ 1, s is an adjustment coefficient
θ0And theta is a starting angle of a point A of the air guide line segment AC, and is a polar coordinate angle variable of any point on the AC.
5. The range hood with a current collector of claim 1, wherein: the first air guide section AB is a straight line section.
6. The range hood with a current collector of claim 5, wherein: the polar radius R of the second wind guide section BC is defined asVariable helical expansion angle
λ1And λ2Are all belonged to [1 DEG, 10 DEG ]]，
Is the wrap angle of the second wind guiding section BC,
R1is the outer diameter of the impeller, r e [ -5, 5 [ ]]And r ≠ 1, s is an adjustment coefficient
θ0The starting angle of a point B of the second wind guiding segment BC is θ, which is a polar coordinate angle variable of an arbitrary point on BC.
7. The range hood with a current collector of any one of claims 1 to 6, 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
8. The range hood with a current collector of claim 7, wherein: the projection length H of the air guide line segment AC in the axial direction of the impeller and the outer diameter R of the impeller1In a relationship of
9. The range hood with a current collector of claim 7, 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
10. The range hood with a current collector of claim 2, wherein: the wind guide line segment AC is an equiangular logarithmic spiral line with equal divergence angle.
11. The range hood with a current collector of claim 1, wherein: the collector is provided with a fixing surface which is used for fixing with the volute casing at the outer side of the circumferential direction of the air guide surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969631.2A CN110857791A (en) | 2018-08-23 | 2018-08-23 | Range hood with current collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969631.2A CN110857791A (en) | 2018-08-23 | 2018-08-23 | Range hood with current collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110857791A true CN110857791A (en) | 2020-03-03 |
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ID=69635481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810969631.2A Pending CN110857791A (en) | 2018-08-23 | 2018-08-23 | Range hood with current collector |
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| Country | Link |
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| CN (1) | CN110857791A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264599A (en) * | 2022-08-04 | 2022-11-01 | 珠海格力电器股份有限公司 | Guiding device, fan and air conditioner |
| WO2024055614A1 (en) * | 2022-09-15 | 2024-03-21 | 佛山市顺德区美的电热电器制造有限公司 | Range hood assembly and integrated cooker |
-
2018
- 2018-08-23 CN CN201810969631.2A patent/CN110857791A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264599A (en) * | 2022-08-04 | 2022-11-01 | 珠海格力电器股份有限公司 | Guiding device, fan and air conditioner |
| WO2024055614A1 (en) * | 2022-09-15 | 2024-03-21 | 佛山市顺德区美的电热电器制造有限公司 | Range hood assembly and integrated cooker |
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