US20090028715A1 - Impeller - Google Patents
Impeller Download PDFInfo
- Publication number
- US20090028715A1 US20090028715A1 US11/902,019 US90201907A US2009028715A1 US 20090028715 A1 US20090028715 A1 US 20090028715A1 US 90201907 A US90201907 A US 90201907A US 2009028715 A1 US2009028715 A1 US 2009028715A1
- Authority
- US
- United States
- Prior art keywords
- metal ring
- top portion
- annular wall
- hub
- 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
Links
Images
Classifications
-
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/329—Details of the hub
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
- F04D29/646—Mounting or removal of fans
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An impeller includes a hub having a top portion and an annular wall extending from a circumference of the top portion in a direction perpendicular to the top portion. The top portion includes a shaft base for coupling with a shaft located in an inner space defined by the top portion and the annular wall. A plurality of blades are mounted to an outer periphery of the annular wall. A metal ring is mounted in the inner space of the hub. The annular wall has a thickness substantially smaller than that of the top portion, allowing the metal ring to be inserted into the inner space by tight coupling.
Description
- 1. Field of the Invention
- The present invention relates to an impeller and, more particularly, to an impeller including a hub having a top portion and an annular wall with a thickness smaller than that of the top portion to allow easy manufacture while saving material costs.
- 2. Description of Related Art
-
FIGS. 1 and 2 show a conventional impeller including arotor 7 having ahub 71 and a plurality ofblades 72. Theblades 72 are annularly spaced and formed on an outer periphery of anannular wall 711 of thehub 71. Ashaft 73 is fixed to a center of thehub 71. The thickness of a top portion of thehub 71 is substantially the same as that of theannular wall 711 thereof. A plurality ofengaging ribs 712 is axially formed on an inner periphery of theannular wall 711. Ametal ring 8 includes increasing diameters from afirst end 81 thereof toward asecond end 82 thereof. Thefirst end 81 of themetal ring 8 includes anannular lip 83 extending radially inward. Amagnetic ring 9 is received in themetal ring 8, engaged with an inner periphery of themetal ring 8, and abuts against theannular lip 83. - With reference to
FIGS. 1 and 2 , an outer diameter of thefirst end 81 of themetal ring 8 is slightly smaller than an inner diameter defined by theribs 712 of thehub 71, and an outer diameter of thesecond end 82 of themetal ring 8 is slightly larger than the inner diameter defined by theribs 712 of thehub 71. Thus, thefirst end 81 of themetal ring 8 can easily enter an inner space defined by theannular wall 711 when themetal ring 8 is inserted into therotor 7. Themetal ring 8 is forcibly inserted into the inner space with an external force until themetal ring 8 is completely received in thehub 71. At this time, thesecond end 82 of themetal ring 8 is positioned between theribs 712 by tight coupling, forming a plastic impeller. Such an impeller is disclosed in for example Taiwan Utility Model Publication No. 562332. - However, since the top portion of the
hub 71 must have a sufficient thickness to avoid breakage resulting from stress concentration in a location at a bend adjacent to the center of thehub 71 and since the thickness of theannular wall 711 of thehub 71 is substantially the same as that of the top portion of thehub 71, theribs 712 are necessary on the inner periphery of theannular wall 711 to provide plastic deformation capability for the purposes of tightly positioning themetal ring 8 in theannular wall 711. As a result, additional and special processing on themetal ring 8 is required to provide themetal ring 8 with various diameters at two ends thereof. Namely, more processing jobs prior to assembly are needed and, thus, lead to difficult manufacture. - It is, therefore, a need of an impeller that can be manufactured and assembled easily.
- The primary object of the present invention is to provide an impeller that includes a hub having an annular wall with a thickness substantially smaller than that of a top portion of the hub. The substantial thickness of the annular wall of the hub is reduced to enhance its plastic deformation capability for allowing assembly with a metal ring that is inserted into the hub by tight coupling. The impeller according to the preferred teachings of the present invention can be easily manufactured while saving material costs.
- An impeller according to the preferred teachings of the present invention includes a hub having a top portion and an annular wall extending from a circumference of the top portion in a direction perpendicular to the top portion. The top portion and the annular wall together define an inner space. The top portion includes a shaft base adapted for coupling with a shaft located in the inner space. A plurality of blades are mounted to an outer periphery of the annular wall. A metal ring is mounted in the inner space of the hub. The annular wall has a thickness substantially smaller than that of the top portion, allowing the metal ring to be inserted into the inner space by tight coupling.
- Preferably, the annular wall includes at least one positioning portion extending inward from an inner periphery of the annular wall. The at least one positioning portion abuts with an outer end of the metal ring distant to the top portion of the hub to retain the metal ring in the inner space.
- Preferably, the metal ring includes a compartment adapted for receiving an annular magnet.
- Preferably, the metal ring further includes an annular lip extending radially inward form an inner end thereof adjacent to the top portion of the hub. The annular lip abuts with an end of an annular magnet mounted in the metal ring.
- Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
-
FIG. 1 is an exploded cross sectional view of a conventional impeller; -
FIG. 2 shows a cross sectional view of the conventional impeller ofFIG. 1 after assembly; -
FIG. 3 shows an exploded perspective view of an impeller of a first embodiment according to the preferred teachings of the present invention; -
FIG. 4 shows an exploded sectional view of the impeller ofFIG. 3 ; -
FIG. 5 shows a cross sectional view of the impeller ofFIG. 3 after assembly; and -
FIG. 6 shows a cross sectional view of an impeller of a second embodiment according to the preferred teachings of the present invention after assembly. - An
impeller 1 of a first embodiment according to the preferred teachings of the present invention is shown inFIGS. 3-5 . Theimpeller 1 is integrally formed by injection molding of a plastic material such as polyphenylene sulfide, polypropylene, resin, or polyester ester ketone. Theimpeller 1 can be an axial flow impeller or a blower type impeller. In the embodiment shown, theimpeller 1 is an axial flow impeller. Theimpeller 1 includes ahub 11, a plurality ofblades 12, and ashaft 13. Thehub 11 is substantially cylindrical or tubular. Theblades 12 are provided on an outer periphery of thehub 11 and spaced from each other at regular intervals. Theshaft 13 is mounted to a center of thehub 11. - With reference to
FIGS. 3 and 4 , thehub 11 of the first embodiment includes atop portion 111 and anannular wall 112 extending from a circumference of thetop portion 111 in a longitudinal direction perpendicular to a general plane on which thetop portion 111 lies. Thetop portion 111 and theannular wall 112 together define aninner space 110 for receiving ametal ring 2 and anannular magnet 3. Thetop portion 111 includes ashaft base 113 on a center of an inner face thereof and located in theinner space 110. An end of theshaft 13 is coupled with theshaft base 113. Theannular wall 112 has a thickness T2 substantially smaller than that T1 of thetop portion 111. - With reference to
FIGS. 4 and 5 , themetal ring 2 of this embodiment is mounted in theinner space 110 of thehub 11 by tight coupling. Theannular magnet 3 is inserted into acompartment 20 in themetal ring 2, with an end of theannular magnet 3 abutting against anannular lip 21 extending radially inward from an inner end of themetal ring 2 adjacent to thetop portion 11 of thehub 11. Thus, theannular magnet 3 is fixedly positioned in thecompartment 20. An outer diameter of themetal ring 2 is preferably slightly larger than an inner diameter of theinner space 110. Since theannular wall 112 of thehub 11 has a thickness T2 substantially smaller than that T1 of thetop portion 111, theannular wall 112 provides themetal ring 2 with enhanced plastic deformation capability such that themetal ring 2 can be easily inserted into and positioned in theinner space 110 by tight coupling. After themetal ring 2 has been completely inserted into theinner space 110, theannular wall 112 also provides a resilient restoring force to reliably clamp themetal ring 2 in theinner space 110. Thus, themetal ring 2 encloses theannular magnet 3 to avoid magnetic leakage. Meanwhile, themetal ring 2 presses against the inner periphery of theannular wall 112 to enhance theannular wall 112 whose thickness T2 is substantially smaller than that T1 of thetop portion 111 of thehub 11. - Still referring to
FIGS. 4 and 5 , since theannular wall 112 has a reduced thickness T2 smaller than that T1 of thetop portion 111, the overall weight of theannular wall 112 is reduced, and the thickness error of theannular wall 112 during injection molding is also reduced. Uneven weight in the peripheral portion of thehub 11 is avoided, the balancing performance of theimpeller 1 is enhanced, and the amount of material required for forming thehub 11 is saved. -
FIG. 6 shows animpeller 1 of a second embodiment according to the preferred teachings of the present invention. Compared to the first embodiment, theimpeller 1 of the second embodiment further includes at least one positioning portion “a” projecting inward from the inner periphery of theannular wall 112. The positioning portion “a” abuts against an outer end of themetal ring 2 to avoid themetal ring 2 to move out of theinner space 110 of thehub 1. Thus, the assembling reliability of theimpeller 1 is enhanced and the life of theimpeller 1 is prolonged. - The disadvantages of the conventional impellers are avoided by the
impellers 1 according to the preferred teachings of the present invention that include ahub 11 having anannular wall 112 thinner than thetop portion 111 of thehub 11 to enhance the plastic deforming capability of theannular wall 112 such that themetal ring 2 can be inserted into theinner space 110 of theannular wall 112 by tight coupling. The manufacturing procedures are simplified, and material costs are cut. - While the principles of this invention have been disclosed in connection with specific embodiments, it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention, and that any modification and variation without departing the spirit of the invention is intended to be covered by the scope of this invention defined only by the appended claims.
Claims (4)
1. An impeller comprising:
a hub including a top portion and an annular wall extending from a circumference of the top portion in a direction perpendicular to the top portion, with the top portion and the annular wall together defining an inner space, and with the top portion including a shaft base adapted for coupling with a shaft located in the inner space;
a plurality of blades mounted to an outer periphery of the annular wall; and
a metal ring mounted in the inner space of the hub, with the annular wall having a thickness substantially smaller than that of the top portion, allowing the metal ring to be inserted into the inner space by tight coupling.
2. The impeller as claimed in claim 1 , with the annular wall including at least one positioning portion extending inward from an inner periphery of the annular wall, and with said at least one positioning portion abutting with an outer end of the metal ring distant to the top portion of the hub to retain the metal ring in the inner space.
3. The impeller as claimed in claim 1 , with the metal ring including a compartment adapted for receiving an annular magnet.
4. The impeller as claimed in claim 1 , with the metal ring including an inner end adjacent to the top portion of the hub, with the metal ring further including an annular lip extending radially inward form the inner end of the metal ring, and with the annular lip being adapted to abut against an end of an annular magnet mounted in the metal ring.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW096126906A TW200906027A (en) | 2007-07-24 | 2007-07-24 | Impeller structure |
TW96126906 | 2007-07-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090028715A1 true US20090028715A1 (en) | 2009-01-29 |
Family
ID=40295526
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/902,019 Abandoned US20090028715A1 (en) | 2007-07-24 | 2007-09-18 | Impeller |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090028715A1 (en) |
TW (1) | TW200906027A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160107187A1 (en) * | 2014-10-20 | 2016-04-21 | Fishman Corporation | System and method for dispensing a liquid |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5664872A (en) * | 1993-11-23 | 1997-09-09 | Smiths Industries Plc | Combined lamp and fan assembly |
US20040075356A1 (en) * | 2002-10-16 | 2004-04-22 | Sunonwealth Electric Machine Industry Co., Ltd. | Fan rotor |
US20040201298A1 (en) * | 2003-04-08 | 2004-10-14 | Sunonwealth Electric Machine Industry Co., Ltd. | Combination of a base and an axle tube for a fan motor |
US20050006962A1 (en) * | 2003-07-09 | 2005-01-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Rotational balance structure for motor |
-
2007
- 2007-07-24 TW TW096126906A patent/TW200906027A/en unknown
- 2007-09-18 US US11/902,019 patent/US20090028715A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5664872A (en) * | 1993-11-23 | 1997-09-09 | Smiths Industries Plc | Combined lamp and fan assembly |
US20040075356A1 (en) * | 2002-10-16 | 2004-04-22 | Sunonwealth Electric Machine Industry Co., Ltd. | Fan rotor |
US20040201298A1 (en) * | 2003-04-08 | 2004-10-14 | Sunonwealth Electric Machine Industry Co., Ltd. | Combination of a base and an axle tube for a fan motor |
US20050006962A1 (en) * | 2003-07-09 | 2005-01-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Rotational balance structure for motor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160107187A1 (en) * | 2014-10-20 | 2016-04-21 | Fishman Corporation | System and method for dispensing a liquid |
Also Published As
Publication number | Publication date |
---|---|
TW200906027A (en) | 2009-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUNONWEALTH ELECTRIC MACHINE INDUSTRIY CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HORNG, ALEX;REEL/FRAME:019884/0831 Effective date: 20070903 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |