US20130011247A1 - Centrifugal fan with a multistage impeller - Google Patents
Centrifugal fan with a multistage impeller Download PDFInfo
- Publication number
- US20130011247A1 US20130011247A1 US13/177,889 US201113177889A US2013011247A1 US 20130011247 A1 US20130011247 A1 US 20130011247A1 US 201113177889 A US201113177889 A US 201113177889A US 2013011247 A1 US2013011247 A1 US 2013011247A1
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- Prior art keywords
- blade assembly
- stage blade
- stage
- centrifugal fan
- multistage impeller
- 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.)
- Abandoned
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- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 8
- 238000009434 installation Methods 0.000 description 2
- 230000001010 compromised effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
- F04D29/26—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
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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
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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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
- F04D29/26—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
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
- F04D29/286—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors multi-stage rotors
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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
- F04D29/4246—Fan casings comprising more than one outlet
Definitions
- the present invention relates generally to a centrifugal fan with a multistage impeller, and more particularly to a centrifugal fan having at least two stages of blade assemblies.
- the centrifugal fan can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, the centrifugal fan is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise.
- a cooling fan is used as a heat dissipation device for dissipating the heat.
- fans are widely used in different fields for ventilation, exhaustion, air exchange, temperature control, etc. According to the function and property, the fans available in the current market can be classified into three major types, that is, centrifugal fans, diagonal flow fans and axial flow fans. These fans are applied to different sites to meet different requirements in working.
- FIG. 1 is a perspective view of a conventional centrifugal fan.
- the centrifugal fan 1 includes a hub 11 and a blade assembly 12 .
- the hub 11 has a top section 111 and a circumferential section 112 extending from a periphery of the top section 111 . At least one extension section 113 outward extends from the circumferential section 112 in a direction away from the top section 111 .
- the blade assembly 12 is disposed on the extension section 113 .
- the blade assembly 12 includes multiple blades classified into upper blades 121 and lower blades 122 .
- the upper and lower blades 121 , 122 are horizontally connected with each other by means of an annular plate 13 .
- the upper and lower blades 121 , 122 via the annular plate 13 are arranged around the hub 11 .
- the upper and lower blades 121 , 122 have equal diameters so that the centrifugal fan 1 has a unified diameter.
- the centrifugal fan 1 has a unified diameter. Therefore, when installing the centrifugal fan 1 , it often takes place that it is impossible to install or use the centrifugal fan 1 due to limitation of space or interference of peripheral parts. Under such circumstance, it must be compromised to install and use a smaller centrifugal fan with a unified diameter.
- the smaller centrifugal fan often fails to provide a flow meeting the designed flow value. In this case, it is necessary to increase the rotational speed of the smaller centrifugal fan. As a result, the centrifugal fan will make greater noise and the load on the motor will be increased.
- the conventional centrifugal fan has the following shortcomings:
- a primary object of the present invention is to provide a centrifugal fan with a multistage impeller having at least two stages of blade assemblies.
- the multistage impeller has non-unified diameters. Therefore, the centrifugal fan can be installed in an application environment with limited space without being interfered with by peripheral parts.
- a further object of the present invention is to provide the above centrifugal fan with the multistage impeller.
- the centrifugal fan is able to provide an optimal flow and wind pressure at the same rotational speed.
- a still further object of the present invention is to provide the above centrifugal fan with the multistage impeller.
- the centrifugal fan is operable with lower load on the motor and reduced noise.
- the centrifugal fan with the multistage impeller of the present invention includes a hub and a multistage impeller having at least two stages of blade assemblies.
- the hub has a top section and a circumferential section extending from a periphery of the top section. At least one extension section outward extends from the circumferential section in a direction away from the top section.
- the multistage impeller includes a first-stage blade assembly and a second-stage blade assembly.
- the first-stage blade assembly is connected with one end of the extension section, which end is distal from the circumferential section.
- the second-stage blade assembly is positioned on one side of the first-stage blade assembly.
- Each of the first-stage blade assembly and the second-stage blade assembly includes multiple blades annularly arranged around the hub.
- a first connection section is connected between each two adjacent blades of the first-stage blade assembly.
- the blades of the first-stage blade assembly are annularly connected with each other by means of the first connection sections.
- a second connection section is connected between each two adjacent blades of the second-stage blade assembly.
- the blades of the second-stage blade assembly are annularly connected with each other by means of the second connection sections.
- the second-stage blade assembly has a diameter larger than that of the first-stage blade assembly.
- FIG. 1 is a perspective view of a conventional centrifugal fan
- FIG. 2 is a perspective view of a first embodiment of the present invention
- FIG. 3 is a side view of the first embodiment of the present invention.
- FIG. 4 is a side view according to FIG. 3 , showing that the centrifugal fan of the present invention is accommodated in a multistage fan housing;
- FIG. 5 is a perspective view of a second embodiment of the present invention.
- FIG. 6 is a side view of the second embodiment of the present invention.
- FIG. 7 is a perspective view of a third embodiment of the present invention.
- FIG. 8 is a side view of the third embodiment of the present invention.
- the centrifugal fan 2 with the multistage impeller of the present invention includes a hub 3 and a multistage impeller 4 having at least two stages of blade assemblies.
- the hub 3 has a top section 31 and a circumferential section 32 extending from a periphery of the top section 31 .
- At least one extension section 33 outward extends from the circumferential section 32 in a direction away from the top section 31 .
- a first end of the extension section 33 is connected with the circumferential section 32 .
- the multistage impeller 4 includes a first-stage blade assembly 41 and a second-stage blade assembly 42 .
- the first-stage blade assembly 41 is arranged at a second end of the extension section 33 opposite to the first end.
- the first-stage blade assembly 41 includes multiple blades arranged around the hub 3 .
- a first connection section 411 is connected between each two adjacent blades of the first-stage blade assembly 41 .
- the blades are annularly connected with each other by means of the first connection sections 411 to form the first-stage blade assembly 41 in an annular form.
- the second-stage blade assembly 42 is positioned on upper side of the first-stage blade assembly 41 .
- the second-stage blade assembly 42 includes multiple blades arranged around the hub 3 .
- a second connection section 421 is connected between each two adjacent blades of the second-stage blade assembly 42 .
- the blades are annularly connected with each other by means of the second connection sections 421 to form the second-stage blade assembly 42 in an annular form.
- a first-stage annular plate 412 is positioned between the first-stage blade assembly 41 and second-stage blade assembly 42 .
- the second-stage blade assembly 42 is arranged on the upper side of the first-stage blade assembly 41 via the first-stage annular plate
- the extension section 33 is connected to the first connection section 411 of the first-stage blade assembly 41 .
- the multiple blades of the first-stage blade assembly 41 are arranged at equal intervals and perpendicularly extend from the first connection sections 411 .
- the blades are annularly connected with each other via the first connection sections 411 .
- the first-stage annular plate 412 is disposed on the upper side of the first-stage blade assembly 41 .
- the first-stage annular plate 412 extends along an outer circumference of the upper side of the first-stage blade assembly 41 .
- the second-stage blade assembly 42 is arranged on the other side of the first-stage annular plate 412 .
- the first-stage annular plate 412 extends along an inner circumference of lower side of the second-stage blade assembly 42 . Accordingly, the second-stage blade assembly 42 has a diameter larger than that of the first-stage blade assembly 41 . Therefore, the combination of the first-stage blade assembly 41 and the second-stage blade assembly 42 has non-unified diameters
- the centrifugal fan 2 is composed of the hub 3 , the first-stage blade assembly 41 and the second-stage blade assembly 41 .
- the centrifugal fan 2 is mounted in a multistage fan housing 5 .
- the multistage fan housing 5 includes a first-stage case 51 adapted to the first-stage blade assembly 41 and a second-stage case 52 adapted to the second-stage blade assembly 42 .
- the second-stage blade assembly 42 is disposed in the second-stage case 52
- the first-stage blade assembly 41 is disposed in the first-stage case 51 .
- the centrifugal fan 2 can be completely accommodated in the multistage fan housing 5 .
- the centrifugal fan 2 can be installed in an application environment with limited space without being interfered with by peripheral parts.
- the centrifugal fan 2 is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise.
- FIGS. 5 and 6 show a second embodiment of the present invention.
- the second embodiment is substantially identical to the first embodiment in structure and connection relationship between the components and thus will not be repeatedly described hereinafter.
- the second embodiment is only different from the first embodiment in that the multistage impeller 4 of the centrifugal fan 2 is a three-stage impeller further including a third-stage blade assembly 43 .
- the second-stage blade assembly 42 is arranged on the upper side of the first-stage blade assembly 41 via the first-stage annular plate 412 .
- a second-stage annular plate 422 is positioned on the other side of the second-stage blade assembly 42 , which side is distal from the first-stage blade assembly 41 .
- the third-stage blade assembly 43 is arranged on the other side of the second-stage annular plate 422 .
- the third-stage blade assembly 43 includes multiple blades arranged around the hub 3 .
- a third connection section 431 is connected between each two adjacent blades of the third-stage blade assembly 43 .
- the blades are annularly connected with each other by means of the third connection sections 431 to form the third-stage blade assembly 43 in an annular form.
- the second-stage annular plate 422 extends along an outer circumference of the upper side of the second-stage blade assembly 42 and along an inner circumference of lower side of the third-stage blade assembly 43 . Accordingly, the third-stage blade assembly 43 has a diameter larger than that of the second-stage blade assembly 42 .
- the combination of the first-stage blade assembly 41 , the second-stage blade assembly 42 and the third-stage blade assembly 43 has non-unified diameters. According to the above arrangement, more blade assemblies and annular plates with different diameters can be added to the multistage impeller 4 in accordance with different application environments to form a multistage impeller with non-unified diameters.
- FIGS. 7 and 8 show a third embodiment of the present invention.
- the first-stage blade assembly 41 is arranged at the second end of the extension section 33 extending from the hub 3 .
- the first-stage annular plate 412 is positioned between the first-stage blade assembly 41 and the second-stage blade assembly 42 .
- the first-stage annular plate 412 extends along the outer circumference of the lower side of the first-stage blade assembly 41 .
- the second-stage blade assembly 42 is arranged on the other side of the first-stage annular plate 412 .
- the first-stage annular plate 412 extends along an inner circumference of the upper side of the second-stage blade assembly 42 .
- the second-stage blade assembly 42 has a diameter larger than that of the first-stage blade assembly 41 . Therefore, the combination of the first-stage blade assembly 41 and the second-stage blade assembly 42 has non-unified diameters.
- the centrifugal fan 2 of the present invention can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, the centrifugal fan 2 is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise.
- the centrifugal fan with the multistage impeller of the present invention has the following advantages:
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Abstract
A centrifugal fan with a multistage impeller includes a hub and a multistage impeller having at least two stages of blade assemblies. The hub has a top section and a circumferential section extending from the top section. At least one extension section outward extends from the circumferential section. The multistage impeller is connected with one end of the extension section. The multistage impeller includes a first-stage blade assembly and a second-stage blade assembly. The second-stage blade assembly has a diameter larger than that of the first-stage blade assembly. The centrifugal fan can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, the centrifugal fan is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise.
Description
- 1. Field of the Invention
- The present invention relates generally to a centrifugal fan with a multistage impeller, and more particularly to a centrifugal fan having at least two stages of blade assemblies. The centrifugal fan can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, the centrifugal fan is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise.
- 2. Description of the Related Art
- Recently, thanks to rapid advance of electronic industries, the performances of various electronic components have been more and more promoted. To increase the operation speed of the electronic component, the number of the chips in the electronic component is continuously increased and the processing speed of the chip sets in the electronic component is continuously enhanced. Under such circumstance, the chips will generate high heat when working. The heat generated by the chips must be quickly dissipated. Otherwise, the temperature of the electronic component will rise very quickly to cause deterioration of the performances of the electronic component, slowdown of the operation speed of the electronic component, crash or even burnout of the electronic component. Therefore, it has become an important issue how to quickly dissipate the heat generated by the chips. In general, a cooling fan is used as a heat dissipation device for dissipating the heat.
- Various fans are widely used in different fields for ventilation, exhaustion, air exchange, temperature control, etc. According to the function and property, the fans available in the current market can be classified into three major types, that is, centrifugal fans, diagonal flow fans and axial flow fans. These fans are applied to different sites to meet different requirements in working.
-
FIG. 1 is a perspective view of a conventional centrifugal fan. Thecentrifugal fan 1 includes ahub 11 and ablade assembly 12. Thehub 11 has atop section 111 and acircumferential section 112 extending from a periphery of thetop section 111. At least oneextension section 113 outward extends from thecircumferential section 112 in a direction away from thetop section 111. Theblade assembly 12 is disposed on theextension section 113. Theblade assembly 12 includes multiple blades classified intoupper blades 121 andlower blades 122. The upper andlower blades annular plate 13. The upper andlower blades annular plate 13 are arranged around thehub 11. The upper andlower blades centrifugal fan 1 has a unified diameter. - As aforesaid, the
centrifugal fan 1 has a unified diameter. Therefore, when installing thecentrifugal fan 1, it often takes place that it is impossible to install or use thecentrifugal fan 1 due to limitation of space or interference of peripheral parts. Under such circumstance, it must be compromised to install and use a smaller centrifugal fan with a unified diameter. The smaller centrifugal fan often fails to provide a flow meeting the designed flow value. In this case, it is necessary to increase the rotational speed of the smaller centrifugal fan. As a result, the centrifugal fan will make greater noise and the load on the motor will be increased. - According to the above, the conventional centrifugal fan has the following shortcomings:
- 1. The installation space of the conventional centrifugal fan is limited.
- 2. The installation of the conventional centrifugal fan is subject to interference of peripheral parts.
- 3. The conventional centrifugal fan can hardly provide a flow meeting the designed flow value.
- 4. The conventional centrifugal fan will make greater noise and the load on the motor will be increased.
- A primary object of the present invention is to provide a centrifugal fan with a multistage impeller having at least two stages of blade assemblies. The multistage impeller has non-unified diameters. Therefore, the centrifugal fan can be installed in an application environment with limited space without being interfered with by peripheral parts.
- A further object of the present invention is to provide the above centrifugal fan with the multistage impeller. The centrifugal fan is able to provide an optimal flow and wind pressure at the same rotational speed.
- A still further object of the present invention is to provide the above centrifugal fan with the multistage impeller. The centrifugal fan is operable with lower load on the motor and reduced noise.
- To achieve the above and other objects, the centrifugal fan with the multistage impeller of the present invention includes a hub and a multistage impeller having at least two stages of blade assemblies. The hub has a top section and a circumferential section extending from a periphery of the top section. At least one extension section outward extends from the circumferential section in a direction away from the top section. The multistage impeller includes a first-stage blade assembly and a second-stage blade assembly. The first-stage blade assembly is connected with one end of the extension section, which end is distal from the circumferential section. The second-stage blade assembly is positioned on one side of the first-stage blade assembly. Each of the first-stage blade assembly and the second-stage blade assembly includes multiple blades annularly arranged around the hub. A first connection section is connected between each two adjacent blades of the first-stage blade assembly. The blades of the first-stage blade assembly are annularly connected with each other by means of the first connection sections. A second connection section is connected between each two adjacent blades of the second-stage blade assembly. The blades of the second-stage blade assembly are annularly connected with each other by means of the second connection sections. The second-stage blade assembly has a diameter larger than that of the first-stage blade assembly.
- The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
-
FIG. 1 is a perspective view of a conventional centrifugal fan; -
FIG. 2 is a perspective view of a first embodiment of the present invention; -
FIG. 3 is a side view of the first embodiment of the present invention; -
FIG. 4 is a side view according toFIG. 3 , showing that the centrifugal fan of the present invention is accommodated in a multistage fan housing; -
FIG. 5 is a perspective view of a second embodiment of the present invention; -
FIG. 6 is a side view of the second embodiment of the present invention; -
FIG. 7 is a perspective view of a third embodiment of the present invention; and -
FIG. 8 is a side view of the third embodiment of the present invention. - Please refer to
FIGS. 2 and 3 . According to a first preferred embodiment, thecentrifugal fan 2 with the multistage impeller of the present invention includes ahub 3 and amultistage impeller 4 having at least two stages of blade assemblies. Thehub 3 has atop section 31 and acircumferential section 32 extending from a periphery of thetop section 31. At least oneextension section 33 outward extends from thecircumferential section 32 in a direction away from thetop section 31. A first end of theextension section 33 is connected with thecircumferential section 32. Themultistage impeller 4 includes a first-stage blade assembly 41 and a second-stage blade assembly 42. The first-stage blade assembly 41 is arranged at a second end of theextension section 33 opposite to the first end. The first-stage blade assembly 41 includes multiple blades arranged around thehub 3. Afirst connection section 411 is connected between each two adjacent blades of the first-stage blade assembly 41. The blades are annularly connected with each other by means of thefirst connection sections 411 to form the first-stage blade assembly 41 in an annular form. The second-stage blade assembly 42 is positioned on upper side of the first-stage blade assembly 41. The second-stage blade assembly 42 includes multiple blades arranged around thehub 3. Asecond connection section 421 is connected between each two adjacent blades of the second-stage blade assembly 42. The blades are annularly connected with each other by means of thesecond connection sections 421 to form the second-stage blade assembly 42 in an annular form. A first-stageannular plate 412 is positioned between the first-stage blade assembly 41 and second-stage blade assembly 42. The second-stage blade assembly 42 is arranged on the upper side of the first-stage blade assembly 41 via the first-stageannular plate 412. - The
extension section 33 is connected to thefirst connection section 411 of the first-stage blade assembly 41. The multiple blades of the first-stage blade assembly 41 are arranged at equal intervals and perpendicularly extend from thefirst connection sections 411. The blades are annularly connected with each other via thefirst connection sections 411. The first-stageannular plate 412 is disposed on the upper side of the first-stage blade assembly 41. The first-stageannular plate 412 extends along an outer circumference of the upper side of the first-stage blade assembly 41. The second-stage blade assembly 42 is arranged on the other side of the first-stageannular plate 412. The first-stageannular plate 412 extends along an inner circumference of lower side of the second-stage blade assembly 42. Accordingly, the second-stage blade assembly 42 has a diameter larger than that of the first-stage blade assembly 41. Therefore, the combination of the first-stage blade assembly 41 and the second-stage blade assembly 42 has non-unified diameters. - Please refer to
FIGS. 2 , 3 and 4. Thecentrifugal fan 2 is composed of thehub 3, the first-stage blade assembly 41 and the second-stage blade assembly 41. When installed, thecentrifugal fan 2 is mounted in amultistage fan housing 5. Themultistage fan housing 5 includes a first-stage case 51 adapted to the first-stage blade assembly 41 and a second-stage case 52 adapted to the second-stage blade assembly 42. When assembling thecentrifugal fan 2 with themultistage fan housing 5, the second-stage blade assembly 42 is disposed in the second-stage case 52, while the first-stage blade assembly 41 is disposed in the first-stage case 51. Accordingly, thecentrifugal fan 2 can be completely accommodated in themultistage fan housing 5. In this case, thecentrifugal fan 2 can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, thecentrifugal fan 2 is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise. - Please refer to
FIGS. 5 and 6 , which show a second embodiment of the present invention. The second embodiment is substantially identical to the first embodiment in structure and connection relationship between the components and thus will not be repeatedly described hereinafter. The second embodiment is only different from the first embodiment in that themultistage impeller 4 of thecentrifugal fan 2 is a three-stage impeller further including a third-stage blade assembly 43. The second-stage blade assembly 42 is arranged on the upper side of the first-stage blade assembly 41 via the first-stageannular plate 412. A second-stageannular plate 422 is positioned on the other side of the second-stage blade assembly 42, which side is distal from the first-stage blade assembly 41. The third-stage blade assembly 43 is arranged on the other side of the second-stageannular plate 422. The third-stage blade assembly 43 includes multiple blades arranged around thehub 3. Athird connection section 431 is connected between each two adjacent blades of the third-stage blade assembly 43. The blades are annularly connected with each other by means of thethird connection sections 431 to form the third-stage blade assembly 43 in an annular form. The second-stageannular plate 422 extends along an outer circumference of the upper side of the second-stage blade assembly 42 and along an inner circumference of lower side of the third-stage blade assembly 43. Accordingly, the third-stage blade assembly 43 has a diameter larger than that of the second-stage blade assembly 42. Therefore, the combination of the first-stage blade assembly 41, the second-stage blade assembly 42 and the third-stage blade assembly 43 has non-unified diameters. According to the above arrangement, more blade assemblies and annular plates with different diameters can be added to themultistage impeller 4 in accordance with different application environments to form a multistage impeller with non-unified diameters. - Please refer to
FIGS. 7 and 8 , which show a third embodiment of the present invention. In the third embodiment, the first-stage blade assembly 41 is arranged at the second end of theextension section 33 extending from thehub 3. The first-stageannular plate 412 is positioned between the first-stage blade assembly 41 and the second-stage blade assembly 42. The first-stageannular plate 412 extends along the outer circumference of the lower side of the first-stage blade assembly 41. The second-stage blade assembly 42 is arranged on the other side of the first-stageannular plate 412. The first-stageannular plate 412 extends along an inner circumference of the upper side of the second-stage blade assembly 42. Accordingly, the second-stage blade assembly 42 has a diameter larger than that of the first-stage blade assembly 41. Therefore, the combination of the first-stage blade assembly 41 and the second-stage blade assembly 42 has non-unified diameters. In this case, thecentrifugal fan 2 of the present invention can be installed in an application environment with limited space without being interfered with by peripheral parts. Also, thecentrifugal fan 2 is able to provide an optimal flow and wind pressure at the same rotational speed to lower the load on the motor and reduce the noise. - According to the above arrangement, the centrifugal fan with the multistage impeller of the present invention has the following advantages:
- 1. The centrifugal fan with the multistage impeller of the present invention can be installed in an application environment with limited space.
- 2. The centrifugal fan with the multistage impeller of the present invention can be installed in an application environment without being interfered with by peripheral parts.
- 3. The centrifugal fan with the multistage impeller of the present invention is able to provide an optimal flow and wind pressure at the same rotational speed.
- 4. The centrifugal fan with the multistage impeller of the present invention is operable with lower load on the motor and reduced noise.
- The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. It is understood that many changes and modifications of the above embodiments can be made without departing from the spirit of the present invention. The scope of the present invention is limited only by the appended claims.
Claims (9)
1. A centrifugal fan with a multistage impeller, the centrifugal fan comprising:
a hub having a top section and a circumferential section extending from the top section, at least one extension section outward extending from the circumferential section in a direction away from the top section; and
a multistage impeller having at least two stages of blade assemblies, the multistage impeller including a first-stage blade assembly and a second-stage blade assembly, each of the first-stage blade assembly and the second-stage blade assembly including multiple blades annularly arranged around the hub, the first-stage blade assembly being connected with one end of the extension section, the second-stage blade assembly being positioned on one side of the first-stage blade assembly, the second-stage blade assembly having a diameter larger than that of the first-stage blade assembly.
2. The centrifugal fan with the multistage impeller as claimed in claim 1 , wherein the centrifugal fan is mounted in a multistage fan housing.
3. The centrifugal fan with the multistage impeller as claimed in claim 1 , wherein a first connection section is connected between each two adjacent
4. The centrifugal fan with the multistage impeller as claimed in claim 1 , wherein a second connection section is connected between each two adjacent blades of the second-stage blade assembly, the blades of the second-stage blade assembly being annularly connected with each other by means of the second connection sections to form the second-stage blade assembly in an annular form.
5. The centrifugal fan with the multistage impeller as claimed in claim 1 , wherein a first-stage annular plate is positioned between the first-stage blade assembly and the second-stage blade assembly, the second-stage blade assembly being arranged on one side of the first-stage blade assembly via the first-stage annular plate.
6. The centrifugal fan with the multistage impeller as claimed in claim 5 , wherein a second-stage annular plate is positioned on the other side of the second-stage blade assembly, which side is distal from the first-stage blade assembly, a third-stage blade assembly being arranged on the other side of the second-stage annular plate.
7. The centrifugal fan with the multistage impeller as claimed in claim 6 , wherein the second-stage annular plate has a diameter larger than that of the first-stage annular plate.
8. The centrifugal fan with the multistage impeller as claimed in claim 6 , wherein the third-stage blade assembly includes multiple blades annularly arranged around the hub, a third connection section being connected between each two adjacent blades of the third-stage blade assembly, the blades of the third-stage blade assembly being annularly connected with each other by means of the third connection sections to form the third-stage blade assembly in an annular form.
9. The centrifugal fan with the multistage impeller as claimed in claim 8 , wherein the third-stage blade assembly has a diameter larger than that of the second-stage blade assembly.
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US13/177,889 US20130011247A1 (en) | 2011-07-07 | 2011-07-07 | Centrifugal fan with a multistage impeller |
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US13/177,889 US20130011247A1 (en) | 2011-07-07 | 2011-07-07 | Centrifugal fan with a multistage impeller |
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US20130011247A1 true US20130011247A1 (en) | 2013-01-10 |
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US13/177,889 Abandoned US20130011247A1 (en) | 2011-07-07 | 2011-07-07 | Centrifugal fan with a multistage impeller |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130084187A1 (en) * | 2011-10-04 | 2013-04-04 | Asia Vital Components Co., Ltd. | Blade structure for centrifugal fan |
US20130129513A1 (en) * | 2011-11-20 | 2013-05-23 | Asia Vital Components Co., Ltd. | Centrifugal fan impeller structure |
CN109058130A (en) * | 2018-08-03 | 2018-12-21 | 盛世瑶兰(深圳)科技有限公司 | A kind of exhaust fan reducing noise based on air flow |
CN110195711A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110219827A (en) * | 2019-07-09 | 2019-09-10 | 苏州隆盈智能科技有限公司 | Multistage blade flabellum |
WO2022143328A1 (en) * | 2020-12-31 | 2022-07-07 | 广东美的厨房电器制造有限公司 | Centrifugal fan, household appliance, volute, and cooking utensil |
Citations (2)
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JP2003106289A (en) * | 2001-10-01 | 2003-04-09 | Kondo Kogyo Kk | Multi-stage centrifugal fan |
JP2008019769A (en) * | 2006-07-12 | 2008-01-31 | Calsonic Kansei Corp | Centrifugal fan and blower |
-
2011
- 2011-07-07 US US13/177,889 patent/US20130011247A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003106289A (en) * | 2001-10-01 | 2003-04-09 | Kondo Kogyo Kk | Multi-stage centrifugal fan |
JP2008019769A (en) * | 2006-07-12 | 2008-01-31 | Calsonic Kansei Corp | Centrifugal fan and blower |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130084187A1 (en) * | 2011-10-04 | 2013-04-04 | Asia Vital Components Co., Ltd. | Blade structure for centrifugal fan |
US9145897B2 (en) * | 2011-10-04 | 2015-09-29 | Asia Vital Components Co., Ltd. | Blade structure for centrifugal fan |
US20130129513A1 (en) * | 2011-11-20 | 2013-05-23 | Asia Vital Components Co., Ltd. | Centrifugal fan impeller structure |
CN110195711A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
JP2019148179A (en) * | 2018-02-26 | 2019-09-05 | 日本電産株式会社 | Centrifugal fan |
JP7043884B2 (en) | 2018-02-26 | 2022-03-30 | 日本電産株式会社 | Centrifugal fan |
CN109058130A (en) * | 2018-08-03 | 2018-12-21 | 盛世瑶兰(深圳)科技有限公司 | A kind of exhaust fan reducing noise based on air flow |
CN110219827A (en) * | 2019-07-09 | 2019-09-10 | 苏州隆盈智能科技有限公司 | Multistage blade flabellum |
WO2022143328A1 (en) * | 2020-12-31 | 2022-07-07 | 广东美的厨房电器制造有限公司 | Centrifugal fan, household appliance, volute, and cooking utensil |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ASIA VITAL COMPONENTS CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIU, JIN-HSUN;REEL/FRAME:026555/0421 Effective date: 20110630 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |