CN111120406A - Method for increasing air volume of centrifugal fan - Google Patents
Method for increasing air volume of centrifugal fan Download PDFInfo
- Publication number
- CN111120406A CN111120406A CN201911302267.5A CN201911302267A CN111120406A CN 111120406 A CN111120406 A CN 111120406A CN 201911302267 A CN201911302267 A CN 201911302267A CN 111120406 A CN111120406 A CN 111120406A
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- CN
- China
- Prior art keywords
- volute
- reduced
- outlet
- equal
- centrifugal fan
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- 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.)
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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
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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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
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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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
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
Abstract
The invention discloses a method for increasing the air quantity of a centrifugal fan. According to the invention, on the premise of keeping the geometric shape of the exhaust outlet of the volute unchanged, the volute molded line is optimized, the volute tongue radius in the optimized volute molded line is reduced, the outlet expansion angle is increased, the volute outlet section tends to the gas flow direction, the speed distribution in the volute is smoother after optimization, and the flow loss is reduced. The speed change at the volute tongue becomes gentle after optimization, and the flowing state of fluid in the flow channel is improved, so that the pressure pulsation in the volute tongue area is reduced, and the flowing loss at the volute tongue is reduced.
Description
Technical Field
The invention relates to the technical field of fluid machinery, in particular to a method for increasing air quantity of a centrifugal fan.
Background
The fan is generally applied to industrial production in modern society and life of people, the fan can be mainly divided into an axial flow fan and a centrifugal fan, and the centrifugal fan has the advantages of small friction, high rotating speed, high efficiency, low failure rate, low noise and the like, so that the centrifugal fan is widely applied to important industries such as heat dissipation of electronic equipment, agricultural production, metal smelting, chemical plants, papermaking, environmental protection and the like, and is also commonly used for ventilation, air conditioning systems and the like in building places.
The centrifugal fan mainly comprises an inlet guide vane, an impeller, a volute, a rotating shaft and the like. The motor drives the impeller to rotate at a high speed in the volute, the blades do work on fluid in the fan, the fluid generates kinetic energy and is thrown out from the periphery of the impeller and thrown to the periphery to form high-speed and high-pressure gas. After the fluid is separated from the impeller, the gas speed is gradually stabilized due to the continuous expansion of the cross section, and finally the gas is discharged out of the fan at a higher speed. After the gas is discharged, a certain vacuum degree is formed at the impeller, and new gas is extruded into the fan turbine under the action of the external atmospheric pressure, so that continuous gas flow is formed.
Disclosure of Invention
Aiming at the defects of larger flow loss and small air volume of the existing centrifugal fan, the invention provides a method for increasing the air volume of the centrifugal fan so as to reduce the flow loss and improve the air volume of the centrifugal fan.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention improves the air quantity of a fan system by changing the structural parameters of the volute outlet, and specifically comprises the following steps:
on the premise of keeping the geometric shape of the exhaust outlet of the volute unchanged, the volute molded line is optimized, the volute tongue radius in the optimized volute molded line is reduced, the outlet expansion angle is increased, the volute outlet section tends to the gas flow direction, the speed distribution in the volute is smoother after optimization, and the flow loss is reduced.
The speed change at the volute tongue becomes gentle after optimization, and the flowing state of fluid in the flow channel is improved, so that the pressure pulsation in the volute tongue area is reduced, and the flowing loss at the volute tongue is reduced.
Furthermore, the outlet expansion angle is more than or equal to 15 degrees and less than or equal to 40 degrees.
Furthermore, the radius r of the volute tongue is more than or equal to 6mm and less than or equal to 15.5 mm.
Furthermore, t is more than or equal to 12mm and less than or equal to 18 mm.
Compared with the prior art, the invention has the following beneficial effects: the invention ensures that the flow structure in the volute is more reasonable and the flow loss is less under the condition of not increasing the energy consumption, and the air volume is improved by nearly 20 percent.
Drawings
FIG. 1 is a schematic view of a centrifugal fan according to the present invention;
FIG. 2 is a schematic diagram of the profile of the volute of the centrifugal fan before and after optimization according to the present invention;
reference numerals: 1. volute tongue 2, outlet 3, impeller.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following will make clear and complete description of the technical solution of the present invention with reference to the drawings in the present application, and it is obvious that the description is only a part of the embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the protection scope of the invention.
A method for increasing the air quantity of a centrifugal fan comprises the optimization of three structural parameters of an outlet expansion angle theta, a volute tongue radius r and a volute tongue gap t of a volute.
The air quantity of the fan system is improved by changing the structural parameters of the volute outlet. On the premise of keeping the geometric shape of the exhaust outlet of the volute unchanged, the volute molded line is optimized, the volute tongue radius of the optimized volute molded line is reduced, the outlet expansion angle is increased, the volute outlet section tends to the gas flow direction, the speed distribution in the volute is smoother after optimization, and the flow loss is reduced. Due to the tongue impact phenomenon, obvious boundary layer separation can occur at the curved and swept position of the airflow, so that the airflow is deviated to the volute tongue, and the volute tongue is impacted strongly, so that the static pressure pulsation at the volute tongue is strongest, the speed change at the volute tongue becomes gentle after optimization, the flowing state of fluid in a flow channel is improved well, the pressure pulsation in the volute tongue area is reduced, and the flowing loss at the volute tongue is reduced. The external characteristics of the optimized model are improved, the air volume is increased by 19.683%, the distribution of parameters such as speed, total pressure and the like in the centrifugal fan before and after optimization is contrasted and analyzed, and the optimized flow structure in the volute is more reasonable and the flow loss is less.
Example (b):
as shown in fig. 1 and 2, the air volume of the grading system is improved by changing the structural parameters of the volute outlet 2, and the grading system specifically comprises three structural parameters, namely an expansion angle theta of the volute outlet 2, a radius r of the volute tongue 1 and a gap t of the volute tongue 1. The research object adopts a common centrifugal ventilator in the market, the ventilator mainly comprises an impeller 3 and a volute, and the divergence angle of the volute outlet 2 is measured to be theta =24 degrees, the radius r of the volute tongue 1 is =17.3mm, and the gap t of the volute tongue 1 is =17.4 mm. And performing multi-scheme design on the parameters of the volute by adopting an orthogonal test method, and calculating the air volume value of each test scheme by using numerical simulation. On the premise of keeping the geometric shape of the volute exhaust outlet 2 unchanged, the optimization result is that the expansion angle of the volute outlet 2 is theta =40 degrees, the radius r of the volute tongue 1 is =6mm, the gap t of the volute tongue 1 is =18mm, the radius of the volute molded line volute tongue 1 after optimization is reduced, the expansion angle of the outlet 2 is increased, the sectional line of the volute outlet 2 tends to the gas flowing direction, the external characteristics of the model after optimization are improved, the loss caused by the impact of the gas flow on the volute tongue 1 at the sweepback position can be reduced through the change, and the air volume is increased by nearly 20%.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (3)
1. A method for increasing the air volume of a centrifugal fan is characterized in that: the air quantity of the fan system is improved by changing the structural parameters of the volute outlet, and the method specifically comprises the following steps:
on the premise of keeping the geometric shape of the exhaust outlet of the volute unchanged, the volute molded line is optimized, the volute tongue radius in the optimized volute molded line is reduced, the outlet expansion angle is increased, the volute outlet section tends to the gas flow direction, the speed distribution in the volute is smoother after optimization, and the flow loss is reduced;
the speed change at the volute tongue becomes gentle after optimization, and the flowing state of fluid in the flow channel is improved, so that the pressure pulsation in the volute tongue area is reduced, and the flowing loss at the volute tongue is reduced.
2. The method for increasing the air volume of the centrifugal fan according to claim 1, wherein the method comprises the following steps: the outlet expansion angle is more than or equal to 15 degrees and less than or equal to 40 degrees.
3. The method for increasing the air volume of the centrifugal fan according to claim 1, wherein the method comprises the following steps: r is more than or equal to 6mm and less than or equal to 15.5mm, and t is more than or equal to 12mm and less than or equal to 18 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911302267.5A CN111120406A (en) | 2019-12-17 | 2019-12-17 | Method for increasing air volume of centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911302267.5A CN111120406A (en) | 2019-12-17 | 2019-12-17 | Method for increasing air volume of centrifugal fan |
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| Publication Number | Publication Date |
|---|---|
| CN111120406A true CN111120406A (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911302267.5A Pending CN111120406A (en) | 2019-12-17 | 2019-12-17 | Method for increasing air volume of centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111120406A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688086A (en) * | 2020-12-28 | 2022-07-01 | 苏州三星电子有限公司 | Volute and air duct machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965470A (en) * | 2017-05-08 | 2018-04-27 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
| CN109973432A (en) * | 2017-12-28 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
-
2019
- 2019-12-17 CN CN201911302267.5A patent/CN111120406A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965470A (en) * | 2017-05-08 | 2018-04-27 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
| CN109973432A (en) * | 2017-12-28 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
Non-Patent Citations (1)
| Title |
|---|
| 张磊 等: "离心风机蜗壳出口结构优化研究", 《流体机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688086A (en) * | 2020-12-28 | 2022-07-01 | 苏州三星电子有限公司 | Volute and air duct machine |
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Application publication date: 20200508 |