US20050074346A1 - Low part count blower-motor assembly in common housing - Google Patents
Low part count blower-motor assembly in common housing Download PDFInfo
- Publication number
- US20050074346A1 US20050074346A1 US10/949,260 US94926004A US2005074346A1 US 20050074346 A1 US20050074346 A1 US 20050074346A1 US 94926004 A US94926004 A US 94926004A US 2005074346 A1 US2005074346 A1 US 2005074346A1
- Authority
- US
- United States
- Prior art keywords
- blower
- stator
- motor assembly
- fluid
- subassembly
- 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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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
- 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
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- Typical blower-motor assemblies include at least three major subassemblies, the blower or impeller, an electric motor driving the blower, and one or more housings.
- the motor is an external component and is connected in driving relationship with the blower by a drive shaft which passes through a blower housing.
- This arrangement results in high noise generation, air leakage at the shaft opening in the blower housing, air leakage through the motor bearings, and motor cooling problems if the blower is contained within an enclosed space.
- a further object of the invention is to provide for improved cooling of the motor by diverting a portion of the main air stream passing through the blower and directing it through the motor stator.
- Another object of the invention is to provide integrated unitary stator and rotor assemblies, and in some instances integrated unitary rotor and blower or impeller assemblies thus aiding in minimizing part counts.
- an important object of the invention is to provide a blower-motor assembly wherein at least the shaft and motor bearings are arranged in a housing in such a manner that there is no significant pressure drop across the bearings.
- a two-part housing defines fluid inlet and discharge openings for a blower.
- the housing is otherwise sealed when the parts are joined together in assembly.
- An integrated tubular stator subassembly is fixedly attached to one of the housing parts and projects toward the fluid inlet opening.
- a motor rotor assembly which is also integrated is disposed within the housing in coaxial relationship with the stator assembly for rotation thereabout part of the rotor assembly being located axially between the stator and the inlet opening in the housing.
- a shaft is journalled in the central opening in the tubular stator and projects axially toward the inlet opening in the housing.
- Mounted on the projecting end portion of the shaft is a fluid impeller adapted to receive fluid from the inlet opening, the shaft being attached to the part of the rotor residing between the stator and the inlet opening and driven thereby.
- Motor cooling is provided by openings connecting the interior of the stator and the upstream and downstream sides of the impeller, at least one of said openings having a flow-regulating device.
- stator assembly is in accordance with the teaching of U.S. application Ser. No. 10/679,143, Improved Permanent Magnet Motor, filed Oct. 2, 2003, herein incorporated herein by reference, with the entire assembly overmolded in an injection molding process resulting in a unitary component.
- rotor assembly is preferably constructed in accordance with the teaching of U.S. Application 60/508,413, Method for Making Rotor for Permanent Magnet Electric Machine, filed Oct. 2, 2003, herein by reference, with the entire assembly overmolded in am injection molding process resulting in a unitary component.
- a bearing tower, to be described herein below, is also constructed in accordance with the teaching of U.S.
- the aforesaid integral components and other features are not essential, and it is only necessary the assembly be designed in a general way to provide the absence of any significant pressure drop across the bearings and the diversion of a portion of the main fluid flow from the impeller for flow through the motor and cooling of the same.
- FIG. 1 of the drawings is a sectional view through the blower-motor assembly of the invention
- FIG. 2 is a sectional view similar to FIG. 1 but taken one hundred twenty degrees removed from the FIG. 1 view,
- FIG. 3 is a fragmentary section similar to FIG. 2 showing connecting screws between the rotor and stator
- FIG. 4 is a further fragmentary section similar to FIG. 3 but showing regulating plugs installed in air passageways connecting the interior of the stator with a low pressure area near the impeller inlet,
- FIG. 5 is a sectional view similar to FIG. 2 but emphasizing the unitary result and overmolding construction of the stator and rotor assemblies.
- a low part count blower-motor assembly is indicated generally at 10 and includes upper and lower parts 12 and 14 .
- the parts are adapted for snap-fit engagement at a tongue and groove joint 16 .
- the upper part 12 carries a stator assembly 18 attached to the housing by screws 20 , 20 (one shown) and which may be conventional or which may follow the teaching of the above mentioned U.S. application Ser. No. 10/679,143.
- the stator is tubular with annular windings at 19 and a bearing tower 22 , which may be constructed in accordance with the aforementioned U.S. Application 60/442,407, supported in its central opening 24 in turn carries front and rear bearing units 26 and 28 .
- the bearing units 26 , 28 journal a shaft 30 which projects downwardly from the central opening of the stator toward a fluid inlet opening 32 on the lower or second housing part 14 .
- a discharge opening is formed cooperatively by the two housings parts 12 and 14 at 33 .
- a rotor assembly 34 Supported by the stator assembly 18 for rotation thereabout is a rotor assembly 34 which may be conventional or which may follow the teaching of the aforementioned U.S. Application 60/508,413.
- the rotor assembly 34 carries one or more permanent magnet 36 , 36 and has a radially extending part 38 which resides between the stator and the inlet opening 32 .
- a blower or impeller shown as an air impeller 40 , is mounted on the projecting end portion of the shaft 30 and rotor 38 , which is then held in its axial proximity relative to the stator by screws 42 , 42 which attach the stationary spring 54 , 54 of the rotor to the stator assembly and is shown attached to the rotor part 38 by screws 42 , 42 , FIGS. 3, 4 , and 5 .
- the impeller 40 will draw air in through the inlet 32 and discharge the same radially outwardly under pressure as indicated by the arrows 44 , 44 in FIG. 2 .
- the main air stream air makes a right angle turn upwardly along the wall of the lower housing part 14 and then leaves the housing through the discharge opening 33 after a second right angle turn.
- a portion of the main air stream is diverted upwardly and radially inwardly at the top of the housing and enters the stator interior through openings 48 , 48 , one shown.
- the diverted or cooling air stream represented by the arrows 46 , 46 continues downwardly through the central opening of the stator about the bearing tower 22 and exits through openings 50 , 50 to the relatively low pressure area adjacent the inlet of the impeller, FIG. 3 .
- the bearings and windings, critical components, are thus cooled in a highly efficient manner.
- plugs 52 , 52 are provided for the openings 50 , 50 and may serve as air flow regulating devices. That is, by properly dimensioning the plugs relative to their respective openings to regulate leakage or, for example, by providing vent openings of selected size, the air discharge area can be altered and the cooling effect regulated. From the foregoing, it will be apparent that an extremely low count blower assembly has been provided with the motor and blower in a compact arrangement in a common housing and with novel and highly effective cooling provisions for the motor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
- Provisional application No. 60/508,414, titled “Blower with motor sealed inside” filed Oct. 2, 2003, inventors Robert A. Hoyt, David A. Curtis and Russel H. Marvin, incorporated herein by reference.
- Typical blower-motor assemblies include at least three major subassemblies, the blower or impeller, an electric motor driving the blower, and one or more housings.
- Part counts in these assemblies is high due primarily to the complexity of the electric motors and this of course leads to relatively inefficient assembly and manufacturing procedures. Conventionally, the motor is an external component and is connected in driving relationship with the blower by a drive shaft which passes through a blower housing. This arrangement results in high noise generation, air leakage at the shaft opening in the blower housing, air leakage through the motor bearings, and motor cooling problems if the blower is contained within an enclosed space.
- It is a general object of the present invention to provide a low part count blower-motor assembly in a common housing whereby to eliminate air leakage between the motor and blower wheel thus improving performance, reducing noise generation, enhancing motor cooling, and protecting the motor from harmful environmental conditions. A further object of the invention is to provide for improved cooling of the motor by diverting a portion of the main air stream passing through the blower and directing it through the motor stator.
- Another object of the invention is to provide integrated unitary stator and rotor assemblies, and in some instances integrated unitary rotor and blower or impeller assemblies thus aiding in minimizing part counts.
- Finally, an important object of the invention is to provide a blower-motor assembly wherein at least the shaft and motor bearings are arranged in a housing in such a manner that there is no significant pressure drop across the bearings.
- In accordance with the present invention and in fulfillment of the foregoing objects a two-part housing is provided and defines fluid inlet and discharge openings for a blower. The housing is otherwise sealed when the parts are joined together in assembly. An integrated tubular stator subassembly is fixedly attached to one of the housing parts and projects toward the fluid inlet opening. A motor rotor assembly which is also integrated is disposed within the housing in coaxial relationship with the stator assembly for rotation thereabout part of the rotor assembly being located axially between the stator and the inlet opening in the housing. A shaft is journalled in the central opening in the tubular stator and projects axially toward the inlet opening in the housing. Mounted on the projecting end portion of the shaft is a fluid impeller adapted to receive fluid from the inlet opening, the shaft being attached to the part of the rotor residing between the stator and the inlet opening and driven thereby.
- Motor cooling is provided by openings connecting the interior of the stator and the upstream and downstream sides of the impeller, at least one of said openings having a flow-regulating device.
- Preferably the construction of the stator assembly is in accordance with the teaching of U.S. application Ser. No. 10/679,143, Improved Permanent Magnet Motor, filed Oct. 2, 2003, herein incorporated herein by reference, with the entire assembly overmolded in an injection molding process resulting in a unitary component. Similarly, the rotor assembly is preferably constructed in accordance with the teaching of U.S. Application 60/508,413, Method for Making Rotor for Permanent Magnet Electric Machine, filed Oct. 2, 2003, herein by reference, with the entire assembly overmolded in am injection molding process resulting in a unitary component. A bearing tower, to be described herein below, is also constructed in accordance with the teaching of U.S. Application 60/442,407, herein by reference, with the entire assembly overmolded in an injection molding process resulting in a unitary component. Additionally, it should be noted that the rotor may be molded integrally with the impeller, thus further reducing the number of parts.
- Finally, and in accordance with another aspect of the invention, the aforesaid integral components and other features are not essential, and it is only necessary the assembly be designed in a general way to provide the absence of any significant pressure drop across the bearings and the diversion of a portion of the main fluid flow from the impeller for flow through the motor and cooling of the same.
-
FIG. 1 of the drawings is a sectional view through the blower-motor assembly of the invention, -
FIG. 2 is a sectional view similar toFIG. 1 but taken one hundred twenty degrees removed from theFIG. 1 view, -
FIG. 3 is a fragmentary section similar toFIG. 2 showing connecting screws between the rotor and stator, -
FIG. 4 is a further fragmentary section similar toFIG. 3 but showing regulating plugs installed in air passageways connecting the interior of the stator with a low pressure area near the impeller inlet, -
FIG. 5 is a sectional view similar toFIG. 2 but emphasizing the unitary result and overmolding construction of the stator and rotor assemblies. - Referring to
FIG. 1 , a low part count blower-motor assembly is indicated generally at 10 and includes upper andlower parts groove joint 16. Theupper part 12 carries astator assembly 18 attached to the housing byscrews 20, 20 (one shown) and which may be conventional or which may follow the teaching of the above mentioned U.S. application Ser. No. 10/679,143. The stator is tubular with annular windings at 19 and abearing tower 22, which may be constructed in accordance with the aforementioned U.S. Application 60/442,407, supported in itscentral opening 24 in turn carries front and rear bearingunits bearing units shaft 30 which projects downwardly from the central opening of the stator toward a fluid inlet opening 32 on the lower orsecond housing part 14. A discharge opening is formed cooperatively by the twohousings parts - Supported by the
stator assembly 18 for rotation thereabout is arotor assembly 34 which may be conventional or which may follow the teaching of the aforementioned U.S. Application 60/508,413. Therotor assembly 34 carries one or morepermanent magnet part 38 which resides between the stator and the inlet opening 32. - A blower or impeller, shown as an
air impeller 40, is mounted on the projecting end portion of theshaft 30 androtor 38, which is then held in its axial proximity relative to the stator byscrews stationary spring rotor part 38 byscrews FIGS. 3, 4 , and 5. - As will be apparent, the
impeller 40 will draw air in through theinlet 32 and discharge the same radially outwardly under pressure as indicated by thearrows FIG. 2 . As is also indicated by thearrows lower housing part 14 and then leaves the housing through the discharge opening 33 after a second right angle turn. As indicated by thearrows openings arrows bearing tower 22 and exits throughopenings FIG. 3 . The bearings and windings, critical components, are thus cooled in a highly efficient manner. - Referring to
FIG. 4 ,plugs openings
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/949,260 US20050074346A1 (en) | 2003-10-02 | 2004-09-24 | Low part count blower-motor assembly in common housing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50841403P | 2003-10-02 | 2003-10-02 | |
US10/949,260 US20050074346A1 (en) | 2003-10-02 | 2004-09-24 | Low part count blower-motor assembly in common housing |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050074346A1 true US20050074346A1 (en) | 2005-04-07 |
Family
ID=34396456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/949,260 Abandoned US20050074346A1 (en) | 2003-10-02 | 2004-09-24 | Low part count blower-motor assembly in common housing |
Country Status (1)
Country | Link |
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US (1) | US20050074346A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050074326A1 (en) * | 2003-10-02 | 2005-04-07 | Torrington Research Company | Muffler for impeller with rearwardly curved blades |
US20060023425A1 (en) * | 2003-03-31 | 2006-02-02 | Sanyo Denki Co., Ltd. | Electronic component cooling apparatus |
US9937307B2 (en) | 2006-10-24 | 2018-04-10 | Resmed Motor Technologies Inc. | PAP device with core and vibration isolation system to support the core |
CN108633216A (en) * | 2017-03-16 | 2018-10-09 | 建准电机工业股份有限公司 | Motor assembly and motor electric box thereof |
CN109843365A (en) * | 2016-10-19 | 2019-06-04 | 艾尔芬公司 | Respiratory assistance apparatus with integrated cooling system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3220350A (en) * | 1964-09-03 | 1965-11-30 | Crane Co | Motor driven pump |
US4013384A (en) * | 1974-07-18 | 1977-03-22 | Iwaki Co., Ltd. | Magnetically driven centrifugal pump and means providing cooling fluid flow |
US5350281A (en) * | 1993-01-26 | 1994-09-27 | Sundstrand Corporation | Fan with secondary air passage for motor cooling |
US5967764A (en) * | 1997-08-08 | 1999-10-19 | Bosch Automotive Systems Corporation | Axial fan with self-cooled motor |
US20010033800A1 (en) * | 2000-04-25 | 2001-10-25 | Aisan Kogyo Kabushiki Kaisha | Magnetic coupling pump |
-
2004
- 2004-09-24 US US10/949,260 patent/US20050074346A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3220350A (en) * | 1964-09-03 | 1965-11-30 | Crane Co | Motor driven pump |
US4013384A (en) * | 1974-07-18 | 1977-03-22 | Iwaki Co., Ltd. | Magnetically driven centrifugal pump and means providing cooling fluid flow |
US5350281A (en) * | 1993-01-26 | 1994-09-27 | Sundstrand Corporation | Fan with secondary air passage for motor cooling |
US5967764A (en) * | 1997-08-08 | 1999-10-19 | Bosch Automotive Systems Corporation | Axial fan with self-cooled motor |
US20010033800A1 (en) * | 2000-04-25 | 2001-10-25 | Aisan Kogyo Kabushiki Kaisha | Magnetic coupling pump |
US6524083B2 (en) * | 2000-04-25 | 2003-02-25 | Aisan Kogyo Kabushiki Kaisha | Magnetic coupling pump |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060023425A1 (en) * | 2003-03-31 | 2006-02-02 | Sanyo Denki Co., Ltd. | Electronic component cooling apparatus |
US20050074326A1 (en) * | 2003-10-02 | 2005-04-07 | Torrington Research Company | Muffler for impeller with rearwardly curved blades |
US9937307B2 (en) | 2006-10-24 | 2018-04-10 | Resmed Motor Technologies Inc. | PAP device with core and vibration isolation system to support the core |
US11090453B2 (en) | 2006-10-24 | 2021-08-17 | Resmed Motor Technologies Inc | Brushless DC motor with bearings |
US11786677B2 (en) | 2006-10-24 | 2023-10-17 | Resmed Motor Technologies Inc. | Brushless DC motor with bearings |
CN109843365A (en) * | 2016-10-19 | 2019-06-04 | 艾尔芬公司 | Respiratory assistance apparatus with integrated cooling system |
CN108633216A (en) * | 2017-03-16 | 2018-10-09 | 建准电机工业股份有限公司 | Motor assembly and motor electric box thereof |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: S. A. ARMSTRONG LIMITED, CANADA Free format text: EXCLUSIVE LICENSE AGREEMENT;ASSIGNOR:TORRINGTON RESEARCH COMPANY;REEL/FRAME:016038/0287 Effective date: 20050419 |
|
AS | Assignment |
Owner name: BERGQUIST TORRINGTON COMPANY, THE, MINNESOTA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TORRINGTON RESEARCH COMPANY;REEL/FRAME:017882/0111 Effective date: 20060421 |
|
AS | Assignment |
Owner name: BERQUIST COMPANY, THE, MINNESOTA Free format text: SECURITY INTEREST;ASSIGNOR:TORRINGTON RESEARCH COMPANY;REEL/FRAME:018108/0742 Effective date: 20060223 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |