CN110552899A - multi-wing centrifugal fan for ventilator with built-in guide vanes - Google Patents
multi-wing centrifugal fan for ventilator with built-in guide vanes Download PDFInfo
- Publication number
- CN110552899A CN110552899A CN201910775463.8A CN201910775463A CN110552899A CN 110552899 A CN110552899 A CN 110552899A CN 201910775463 A CN201910775463 A CN 201910775463A CN 110552899 A CN110552899 A CN 110552899A
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- CN
- China
- Prior art keywords
- impeller
- centrifugal
- guide vanes
- fan
- centrifugal fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
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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
Abstract
The invention discloses a guide vane multi-wing centrifugal fan for a built-in ventilator, which comprises a fan volute (1), a volute tongue (11), a centrifugal impeller (2), a straight-plate guide vane (3) and a motor (4), wherein the centrifugal impeller (2) consists of single arc blades (21) and an impeller middle disc (24) which are annularly arranged at equal intervals, and the single arc blades (21) are arranged in an impeller groove (25); the straight-plate type guide vane (3) is arranged at the tail end of each blade of the centrifugal impeller (2); centrifugal impeller (2) is fixedly connected with motor (4) through impeller center (24), motor (4) rotates and drives centrifugal impeller (2) to rotate through impeller center (24), and centrifugal action is formed to exhaust air. Compared with the prior art, the invention has the advantages of strong suction acting force, high particle separation efficiency, simple structure, convenient installation and the like.
Description
Technical Field
The invention relates to a multi-wing centrifugal fan for an air draft fan, in particular to a centrifugal fan with a built-in guide vane.
Background
cooking fume contains various components, and low pumping and purifying efficiency causes household and atmospheric environmental pollution and even becomes a main source of local PM 2.5. The brand new equipment is used for completely replacing the existing mainly used range hood, and the realization of high-efficiency smoke exhaust and oil smoke purification is not practical. The existing main technical means is to optimize the structure of a centrifugal fan which is a core power part of the range hood, improve the smoke exhaust performance of the range hood and realize the oil smoke purification by means of a filter screen grating, a purification assembly and the like. For example, a chinese patent with application number 201811522937.X discloses a range hood with a purification device, which removes oil smoke particles and purifies gas-phase pollutants by passing sucked oil smoke through a gas-phase purification device, an active carbon purification device and a tail gas absorption device in a purification device box. Although the foregoing measures achieve oil fume purification well, the accessory equipment is complex and is limited by installation, running cost and installation space, so that it cannot be applied well to a domestic range hood.
At present, in order to avoid the problem that the cleaning is difficult and the like because of too much oil stain entering the fan, a household range hood is not taken as a main oil smoke separation part, and only an oil screen and other filtering devices are arranged at an inlet of the range hood or an inlet of the fan. However, static filtration can only filter out most of the large-particle-size oil dirt particles, and a large amount of small-particle-size oil dirt particles are directly discharged into the atmosphere along with the oil smoke. Although partial oil stain particles are separated from grease under the centrifugal action of the fan, the oil stain particles with small particle size are difficult to separate from the grease, so that the grease separation efficiency of the smoke exhaust ventilator is reduced.
The invention relates to a volute type multi-wing centrifugal fan for an existing air draft fan, which is a technical problem to be solved urgently.
Disclosure of Invention
The invention discloses a multi-wing centrifugal fan for a built-in guide vane air exhauster, which aims to overcome the technical defects of a volute type multi-wing centrifugal fan for the existing air exhauster, can be used for household and other types of air exhausters, realizes the purposes of increasing the air exhaust amount and improving the oil separation efficiency, and particularly realizes the separation of oil stain particles with small particle size.
The invention relates to a multi-wing centrifugal fan for an air extractor with built-in guide vanes, which comprises a fan volute 1, a volute tongue 11, a centrifugal impeller 2, straight guide vanes 3 and a motor 4, wherein the centrifugal impeller 2 is composed of single arc blades 21 and an impeller center disk 24 which are annularly arranged at equal intervals, impeller grooves 25 which are uniformly distributed are formed in the circumference of the impeller center disk 24, the shape of each impeller groove (25) corresponds to that of each single arc blade 21, each single arc blade 21 is arranged in each impeller groove 25, and each straight guide vane 3 is arranged at the tail end of each blade of the centrifugal impeller 2;
The impeller center plate 24 is positioned at one third of the height of the centrifugal impeller 2, and the centrifugal impeller 2 is fixedly connected with the motor 4 through the impeller center plate 24; the straight-plate type guide vane 3 is arranged at the outlet of the centrifugal impeller 2, and an attack angle of 3 degrees is reserved; the motor 4 rotates and drives the centrifugal impeller 2 to rotate through the impeller center plate 24, and air draft is performed under the centrifugal action.
Compared with the prior art, the multi-wing centrifugal fan for the air exhauster with the built-in guide vanes has the advantages of strong suction acting force, high particle separation efficiency, simple structure, convenience in installation and the like.
Drawings
FIG. 1 is a front view of a multi-blade centrifugal fan for an internal guide vane exhauster of the present invention;
FIG. 2 is a side view of a multi-blade centrifugal fan for an internal guide vane extractor of the present invention;
FIG. 3 is a view of the construction of the centrifugal impeller of the present invention;
FIG. 4 is a schematic view of a straight vane arrangement and span;
FIG. 5 is a schematic view of a straight plate type vane stagger angle;
FIG. 6 is a graph showing the relationship between the flow rate and the pressure coefficient of a centrifugal fan (MCFG) of the present invention and a conventional centrifugal fan (OMCF) without a guide vane.
Reference numerals:
1. The device comprises a fan volute 11, a volute tongue 2, a centrifugal impeller 21, a single arc blade 22, an impeller front cover plate 23, an impeller rear cover plate 24, an impeller middle disc 25, an impeller groove 3, a straight plate type guide vane 4, a motor 41, a hub 5, a wind blocking ring 6, a particle receiving disc 7, an air inlet 8 and an air outlet.
Detailed Description
The invention is further illustrated by the following description and examples in conjunction with the accompanying drawings.
in the multi-blade centrifugal fan structure for the internal guide vane air extractor of the present invention as shown in fig. 1 to 2, the centrifugal fan includes a fan volute 1, a centrifugal impeller 2, a straight guide vane 3, a motor 4, and the like. The centrifugal impeller 2 is composed of single arc blades 21 which are annularly arranged at equal intervals, and the single arc blades 21 are fixedly connected by the centrifugal impeller 2, a front cover plate 22 and a rear cover plate 23; the impeller center plate 24 is positioned at one third of the height of the centrifugal impeller 2, is fixedly connected with the motor 4 and is used for fixing the single-arc blades 21. The motor 4 is fixedly connected with the impeller center plate 24 through a hub 41, and the motor 4 rotates and drives the centrifugal impeller 2 to rotate through the impeller center plate 24. The straight-plate type guide vane 3 is arranged at the outlet of a flow channel of the centrifugal impeller 2, the inlet angle is the same as the outlet angle of the centrifugal impeller 2, and a 3-degree attack angle is reserved. The number of the straight-plate type guide vanes 3 is 36, the straight-plate type guide vanes are annularly arranged around the outer edge of the centrifugal impeller 2 at equal intervals, and the span is 225 degrees.
The multi-wing centrifugal fan for the air extractor with the built-in guide vanes has the following working process:
The centrifugal impeller 2 rotates at a high speed, a large negative pressure is formed in the central area of the centrifugal impeller and on two sides of the impeller center disk 24, and oil smoke is sucked into the fan under the action of the difference between the internal pressure and the external pressure. When oil smoke passes through the centrifugal impeller 2, grease particles or other particles with larger particle sizes are intercepted by the single arc blade 21 rotating at high speed due to inertia force, and first heavy separation of the oil smoke is formed. The intercepted grease particles drop into the oil receiving pan 6 along the single arc blade 21 under the action of gravity. The residual oil smoke is discharged through the centrifugal impeller 2 flow channel and enters the straight guide vane 3 flow channel, the oil smoke leaving the centrifugal impeller 2 has a larger tangential speed due to the rotation of the centrifugal impeller 2, and grease particles in the oil smoke can impact the surface of the stationary straight guide vane 3 and adhere to the stationary straight guide vane, so that the second heavy separation of the oil smoke is formed. The grease particles captured by the straight guide vanes 3 drop into the oil receiving pan 6 along the surfaces of the straight guide vanes 3 under the action of gravity. Under the inertia effect of centrifugal force, grease particles collide with the inner side wall surface of the fan volute 1 and adhere to the inner side wall surface to form the third separation of the oil smoke discharged along the straight guide vane 3. The first and second oil smoke separation stages are the most important oil smoke separation stages, and most of grease particles in the oil smoke are separated in the stages.
By the triple oil-smoke separation, the oil-smoke separation efficiency of the multi-wing centrifugal fan in the range hood with the built-in guide vanes is obviously improved. The separated oil smoke is discharged to the outdoor or public flue through the smoke outlet 8. In addition, the built-in straight plate type guide vane 3 can also play a role in guiding flow and reducing noise, is favorable for discharging flue gas and improves the maximum air quantity of the fan.
As shown in fig. 5, the vane inlet angle β 1 is 79 °, the vane outlet angle β 2 is 163 °, and the vane inlet angle β 3 is calculated by the following formula (1):
β3＝180°-(β2-3°)＝20° (1)
FIG. 6 is a graph showing the relationship between the flow rate and the pressure coefficient of the centrifugal fan (MCFG) of the present invention and the conventional centrifugal fan (OMCF) without the built-in guide vanes. Compared with the traditional centrifugal fan without the built-in guide vanes, the multi-wing centrifugal fan for the range hood with the built-in guide vanes has the advantages that the working performance is obviously improved, the pressure coefficient curve of the built-in guide vane type centrifugal fan is obviously improved, and when the flow coefficient phi is 0.25, the maximum value of the pressure coefficient phi is 1.05, and the improvement is about 10.5%.
The flow coefficient phi and the pressure coefficient psi are respectively calculated by the formulas (2) and (3):
In the formula, q V is the air volume (m 3/s) of the centrifugal fan, Δ p is the total pressure difference (Pa) of the centrifugal fan, ρ is the fluid density (kg/m 3), n is the rotation speed (rpm) of the centrifugal fan, and D 2 is the outer diameter (m) of the centrifugal impeller.
One of the application ranges of the invention is household kitchen, mainly aiming at oil stain particles with the particle size of 1-10 mu m, and being applied to the primary filtering stage of an oil fume purification system. The numerical calculation result shows that the separation efficiency of the multi-wing centrifugal fan for the range hood with the built-in guide vanes is over 82 percent for oil stain particles with the particle size of over 3 mu m. In addition, the method is also suitable for cleaning other air containing grease particles, oil particles and/or other particles.
while the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. The multi-wing centrifugal fan for the air draft fan with the built-in guide vanes is characterized by comprising a fan volute (1), a volute tongue (11), a centrifugal impeller (2), straight guide vanes (3) and a motor (4), wherein the centrifugal impeller (2) is composed of single arc blades (21) and an impeller middle disc (24) which are annularly arranged at equal intervals, impeller grooves (25) are uniformly distributed on the circumference of the impeller middle disc (24), the shapes of the impeller grooves (25) correspond to those of the single arc blades (21), the single arc blades (21) are arranged in the impeller grooves (25), and the straight guide vanes (3) are arranged at the tail ends of each blade of the centrifugal impeller (2);
The impeller central disc (24) is positioned at one third of the height of the centrifugal impeller (2), and the centrifugal impeller (2) is fixedly connected with the motor (4) through the impeller central disc (24); the motor (4) rotates and drives the centrifugal impeller (2) to rotate through the impeller center plate (24), and centrifugal effect is formed to exhaust air.
2. the centrifugal fan with internal guide vanes and multiple wings as claimed in claim 1, wherein when the fumes pass through said centrifugal impeller (2), the particles are intercepted by the single circular arc blades (21) rotating at high speed, forming a first heavy separation of the fumes.
3. The centrifugal fan with internal guide vanes and multiple wings as claimed in claim 1, wherein the particles in the oil smoke leaving the centrifugal impeller (2) impact on the surface of the stationary straight guide vanes (3) and adhere thereto, forming the second re-separation of the oil smoke.
4. The centrifugal fan with internal guide vanes and multiple blades as claimed in claim 1, wherein said straight type guide vanes (3) are installed at the outlet of the centrifugal impeller (2) and leave an attack angle of 3 °.
5. The multiple-wing centrifugal fan with built-in guide vanes according to claim 1, wherein the particles in the oil smoke discharged along the straight guide vanes (3) collide with the inner side wall surface of the fan volute (1) and adhere thereto to form a third separation of the oil smoke.
6. the centrifugal fan with internal guide vanes and multiple blades as claimed in claim 1, wherein the number of the straight guide vanes (3) is 36, and the straight guide vanes are annularly arranged around the outer edge of the centrifugal impeller (2) at equal intervals and have a span of 225 °.
7. The centrifugal fan with multiple blades and internal guide vanes as claimed in claim 1, wherein said fan volute (1) adopts an approximate spiral line with unequal edge distance design.
8. The centrifugal fan with built-in guide vanes and multiple wings as claimed in claim 1, wherein the single arc blade (21) is provided with an oil impeller front cover plate (22) and an impeller rear cover plate (23), respectively.
9. The centrifugal fan with internal guide vanes and multiple blades as claimed in claim 1, wherein the ratio of the inner radius to the outer radius of said centrifugal impeller is 0.84.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775463.8A CN110552899A (en) | 2019-08-21 | 2019-08-21 | multi-wing centrifugal fan for ventilator with built-in guide vanes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775463.8A CN110552899A (en) | 2019-08-21 | 2019-08-21 | multi-wing centrifugal fan for ventilator with built-in guide vanes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110552899A true CN110552899A (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910775463.8A Pending CN110552899A (en) | 2019-08-21 | 2019-08-21 | multi-wing centrifugal fan for ventilator with built-in guide vanes |
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| Country | Link |
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| CN (1) | CN110552899A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779060A (en) * | 2020-12-14 | 2021-05-11 | 吴亦轩 | Device for extracting coal tar in coke oven gas |
| WO2021106317A1 (en) * | 2019-11-27 | 2021-06-03 | 日立グローバルライフソリューションズ株式会社 | Blower and washing machine |
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| CN102562672A (en) * | 2011-12-15 | 2012-07-11 | 广东恒业电器有限公司 | Multi-wing centrifugal fan with multifunctional airflow diversion device |
| JP2016141380A (en) * | 2015-02-05 | 2016-08-08 | 株式会社ヴァレオジャパン | Vehicle air conditioner |
| CN108443220A (en) * | 2017-02-16 | 2018-08-24 | 建准电机工业股份有限公司 | Blowing fan, blowing fan assembly and fan wheel thereof |
| CN109373408A (en) * | 2018-12-17 | 2019-02-22 | 杭州德意电器股份有限公司 | It is a kind of for improving the equipment and separation method of fume exhauster grease separating degree |
| CN109763996A (en) * | 2019-02-27 | 2019-05-17 | 华帝股份有限公司 | Impeller, fan and range hood |
-
2019
- 2019-08-21 CN CN201910775463.8A patent/CN110552899A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562672A (en) * | 2011-12-15 | 2012-07-11 | 广东恒业电器有限公司 | Multi-wing centrifugal fan with multifunctional airflow diversion device |
| JP2016141380A (en) * | 2015-02-05 | 2016-08-08 | 株式会社ヴァレオジャパン | Vehicle air conditioner |
| CN108443220A (en) * | 2017-02-16 | 2018-08-24 | 建准电机工业股份有限公司 | Blowing fan, blowing fan assembly and fan wheel thereof |
| CN109373408A (en) * | 2018-12-17 | 2019-02-22 | 杭州德意电器股份有限公司 | It is a kind of for improving the equipment and separation method of fume exhauster grease separating degree |
| CN109763996A (en) * | 2019-02-27 | 2019-05-17 | 华帝股份有限公司 | Impeller, fan and range hood |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021106317A1 (en) * | 2019-11-27 | 2021-06-03 | 日立グローバルライフソリューションズ株式会社 | Blower and washing machine |
| JP2021085347A (en) * | 2019-11-27 | 2021-06-03 | 日立グローバルライフソリューションズ株式会社 | Air blower and washing machine |
| JP7452989B2 (en) | 2019-11-27 | 2024-03-19 | 日立グローバルライフソリューションズ株式会社 | Blower and washing machine |
| CN112779060A (en) * | 2020-12-14 | 2021-05-11 | 吴亦轩 | Device for extracting coal tar in coke oven gas |
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Application publication date: 20191210 |
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| RJ01 | Rejection of invention patent application after publication |