CN110985411A - Small centrifugal fan - Google Patents
Small centrifugal fan Download PDFInfo
- Publication number
- CN110985411A CN110985411A CN201911107759.9A CN201911107759A CN110985411A CN 110985411 A CN110985411 A CN 110985411A CN 201911107759 A CN201911107759 A CN 201911107759A CN 110985411 A CN110985411 A CN 110985411A
- Authority
- CN
- China
- Prior art keywords
- volute
- centrifugal fan
- cover plate
- flange
- front cover
- 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
- 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
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
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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
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a small centrifugal fan, which comprises a motor, a volute and a centrifugal fan, wherein the motor is connected with the volute; the volute comprises a front cover plate, a rear cover plate, a connecting plate and a flange plate; the front cover plate and the rear cover plate are connected through a connecting plate to form a cavity for accommodating the centrifugal fan, and the flange plate is arranged at the air outlet of the cavity; the outer contours of the front cover plate and the rear cover plate are formed by involutes taking four vertexes of a square as circle centers, and the side length of the square and the base radius of the involutes are determined according to the size of the centrifugal fan; the included angle between the outer wall of the volute where the outlet part of the volute is matched with the flange and the vertical direction is 5-7 degrees, and the vertical direction is perpendicular to the flange; an air outlet is arranged in the center of the front cover plate; the motor is positioned outside the volute and fixedly connected with the rear cover plate of the volute, the centrifugal fan is positioned in the volute, and a core shaft of the centrifugal fan is sleeved outside a main shaft of the motor and is positioned by a pin which radially penetrates through the main shaft. The invention has small volume and high oxygen supply efficiency.
Description
Technical Field
The invention relates to the technical field of fluid machinery, in particular to a small centrifugal fan.
Background
The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. The centrifugal fan accelerates gas by using an impeller rotating at a high speed according to the principle that kinetic energy is converted into potential energy, and then decelerates and changes the flow direction so as to convert the kinetic energy into the potential energy (pressure).
Noise and air volume are two main indexes of the centrifugal fan, and the noise is expected to be as small as possible, and the air volume can reach a larger value. The existing centrifugal fan can cause air backflow or reverse flow in the fan, and is low in oxygen supply efficiency and large in pneumatic noise.
Disclosure of Invention
In order to solve the problems, the invention provides a small centrifugal fan which is small in size and high in oxygen supply efficiency.
The technical scheme adopted by the invention is as follows:
a small centrifugal fan comprises a motor, a volute and a centrifugal fan;
the volute comprises a front cover plate, a rear cover plate, a connecting plate and a flange plate; the front cover plate and the rear cover plate are connected through a connecting plate to form a cavity for accommodating the centrifugal fan, and the flange plate is arranged at the air outlet of the cavity; the outer contours of the front cover plate and the rear cover plate are formed by involutes taking four vertexes of a square as circle centers, and the side length of the square and the base radius of the involutes are determined according to the size of the centrifugal fan; the included angle between the outer wall of the volute where the outlet part of the volute is matched with the flange and the vertical direction is 5-7 degrees, and the vertical direction is perpendicular to the flange; an air outlet is arranged in the center of the front cover plate;
the motor is positioned outside the volute and fixedly connected with the rear cover plate of the volute, the centrifugal fan is positioned in the volute, and a core shaft of the centrifugal fan is sleeved outside a main shaft of the motor and is positioned by a pin which radially penetrates through the main shaft.
Further, the centrifugal fan is integrally formed by injection molding.
Furthermore, the volute tongue of the volute is arc-shaped.
Has the advantages that:
1. the center of the front cover plate of the volute is provided with the air outlet to increase the ventilation volume, and the outer contours of the front cover plate and the rear cover plate of the volute are formed by involutes taking four vertexes of a square as the center of a circle, so that the flow locus of air in the centrifugal fan is met, the backflow situation cannot be generated, and the oxygen supply efficiency is high.
2. The centrifugal fan is integrally formed by injection molding, the front end cover, the rear end cover, the plurality of arc blades and the mandrel are manufactured into a whole to replace the bonding form of all parts, the consistency is good, and the generation of pneumatic noise is reduced.
Drawings
FIG. 1 is a cross-sectional view of the overall structure of the present invention;
FIG. 2 is a schematic view of a volute;
FIG. 3 is a schematic view of a square with reference to the outer contours of the front cover plate and the rear cover plate;
the device comprises a motor 1, a volute 2, a centrifugal fan 3, a front cover plate 4, a locking nut 5, a gasket 6, a retainer ring 7, a flange plate 8, a volute tongue 9, a circular arc blade 10, a connecting plate 11, a rear cover plate 12, a vertex 13, a circular end cover 14 and a main shaft 15.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The present embodiment provides a small centrifugal fan including a motor 1, a scroll casing 2, and a centrifugal fan 3, as shown in fig. 1.
As shown in fig. 2, the volute 2 comprises a front cover plate 4, a rear cover plate 12, a connecting plate 11 and a flange 8; the front cover plate 4 and the rear cover plate 12 are connected through a connecting plate 11 to form a cavity for accommodating the centrifugal fan 3, and the flange 8 is arranged at the air outlet of the cavity and is used for being butted with other equipment; the included angle between the outer wall of the volute 2 at the position where the outlet part of the volute 2 is matched with the flange 8 and the vertical direction is 5-7 degrees, and the vertical direction is vertical to the flange 8, as shown in the figure; the volute tongue 9 of the volute 2 is arc-shaped.
As shown in fig. 3, the outer contours of the front cover plate 4 and the rear cover plate 12 are formed by involutes with four vertexes 13 of a square as the center, and the side length of the square and the base radius of the involute are determined according to the size of the centrifugal fan 3; an air outlet is arranged in the center of the front cover plate 4; the center of the back cover plate 12 is provided with a round hole which is matched and positioned with the boss of the motor 1, and the periphery of the round hole is provided with a countersunk hole which enables a countersunk screw to be embedded in the round hole. The volute 2 also comprises a circular end cover 14 for closing the air outlet of the front cover plate 4, for protecting the centrifugal fan 3 during transportation.
The centrifugal fan 3 is integrally formed by injection molding and comprises a front end cover, a rear end cover, a plurality of arc blades 10 and a mandrel. The number of the arc-shaped blades 10 is an integer.
The motor 1 is positioned outside the volute 2 and fixedly connected with the rear cover plate 12 of the volute 2 through a countersunk screw, the centrifugal fan 3 is positioned in the volute 2, a mandrel of the centrifugal fan 3 is sleeved outside a main shaft 15 of the motor 1 and is positioned by a pin which radially penetrates through the main shaft 15, and the mandrel of the centrifugal fan 3 is axially fixed with the main shaft 15 of the motor 1. A locking nut 5 is installed at the front end of a main shaft 15 extending out of the mandrel, a gasket 6 is arranged on the main shaft 15 between the boss of the motor 1 and the mandrel, and a retainer ring 7 is arranged on the main shaft 15 between the mandrel and the locking nut 5.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A small centrifugal fan is characterized by comprising a motor, a volute and a centrifugal fan;
the volute comprises a front cover plate, a rear cover plate, a connecting plate and a flange plate; the front cover plate and the rear cover plate are connected through a connecting plate to form a cavity for accommodating the centrifugal fan, and the flange plate is arranged at the air outlet of the cavity; the outer contours of the front cover plate and the rear cover plate are formed by involutes taking four vertexes of a square as circle centers, and the side length of the square and the base radius of the involutes are determined according to the size of the centrifugal fan; the included angle between the outer wall of the volute where the outlet part of the volute is matched with the flange and the vertical direction is 5-7 degrees, and the vertical direction is perpendicular to the flange; an air outlet is arranged in the center of the front cover plate;
the motor is positioned outside the volute and fixedly connected with the rear cover plate of the volute, the centrifugal fan is positioned in the volute, and a core shaft of the centrifugal fan is sleeved outside a main shaft of the motor and is positioned by a pin which radially penetrates through the main shaft.
2. The compact centrifugal fan of claim 1 wherein the centrifugal fan is integrally injection molded.
3. The compact centrifugal fan of claim 1 wherein the volute tongue is arcuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911107759.9A CN110985411A (en) | 2019-11-13 | 2019-11-13 | Small centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911107759.9A CN110985411A (en) | 2019-11-13 | 2019-11-13 | Small centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110985411A true CN110985411A (en) | 2020-04-10 |
Family
ID=70084139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911107759.9A Pending CN110985411A (en) | 2019-11-13 | 2019-11-13 | Small centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110985411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526253A (en) * | 2022-04-24 | 2022-05-24 | 佛山市南海九洲普惠风机有限公司 | Small boiler draught fan |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705250A (en) * | 2012-06-25 | 2012-10-03 | 北京北机机电工业有限责任公司 | Minitype centrifugal fan |
| CN203130608U (en) * | 2012-12-07 | 2013-08-14 | 北京北机机电工业有限责任公司 | Volute used for centrifugal fan |
| CN204628063U (en) * | 2015-04-21 | 2015-09-09 | 宁波发达电气制造有限公司 | A kind of structure improved fan blade |
| CN110131206A (en) * | 2019-05-29 | 2019-08-16 | 太仓市宇格明叶环保设备有限公司 | A kind of integrated injection molding impeller with good corrosion resistance |
-
2019
- 2019-11-13 CN CN201911107759.9A patent/CN110985411A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705250A (en) * | 2012-06-25 | 2012-10-03 | 北京北机机电工业有限责任公司 | Minitype centrifugal fan |
| CN203130608U (en) * | 2012-12-07 | 2013-08-14 | 北京北机机电工业有限责任公司 | Volute used for centrifugal fan |
| CN204628063U (en) * | 2015-04-21 | 2015-09-09 | 宁波发达电气制造有限公司 | A kind of structure improved fan blade |
| CN110131206A (en) * | 2019-05-29 | 2019-08-16 | 太仓市宇格明叶环保设备有限公司 | A kind of integrated injection molding impeller with good corrosion resistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526253A (en) * | 2022-04-24 | 2022-05-24 | 佛山市南海九洲普惠风机有限公司 | Small boiler draught fan |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200410 |