Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/00457—Ventilation unit, e.g. combined with a radiator
  • B60H1/00471—The ventilator being of the radial type, i.e. with radial expulsion of the air
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/32—Cooling devices
• • 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

Definitions

• This invention relates generally to centrifugal blowers, and more particularly to centrifugal blowers for use in automotive climate control systems.
• Centrifugal blowers typically include impellers having a plurality of blades that redirect an incoming airflow toward a radial direction as the airflow moves from the impeller inlet to the impeller outlet.
• the blades are typically attached to a hub for rotation therewith.
• An electric motor rotates the impeller at the required speed. The electric motor requires cooling and therefore has an airflow path through the motor.
• the present invention provides a motor cooling air path that prevents water from entering the motor, even if the assembly is tilted up to twenty-five degrees from its installed position. This is achieved by designing the air path with an incline or change in elevation that prevents water from traveling over the top of the incline and into the motor.
• the pressure differential between the cooling path inlet in the volute and outlet at the drive end of the motor drive the air over the incline and through the motor.
• the invention provides a means of preventing water from entering the motor and is self-contained in the blower assembly. This allows the blower assembly to be used in different HVAC modules without the HVAC module manufacturer needing to modify its parts to accommodate the blower motor cooling requirement.
• the invention also provides a centrifugal blower comprising a centrifugal fan including a hub adapted for rotation about a central axis, and a plurality of blades coupled for rotation with the hub.
• the blower also comprises a motor having a drive end and an opposite end, the motor including a drive shaft drivingly connected to the hub of the centrifugal fan, the drive shaft extending from the drive end of the motor, and the motor having therethrough a motor airflow path for cooling the motor, the motor airflow path having an inlet near the opposite end of the motor.
• the blower also comprises housing structure including a blower housing portion at least partially defining a space in which the fan is substantially enclosed, the space having an inlet and an outlet.
• the housing structure also includes a motor housing portion supporting the motor, and a flange portion at least partially supporting the motor housing portion on the blower housing portion.
• the housing structure also includes a cooling air path having an inlet communicating with the space and an outlet communicating with the inlet of the motor airflow path, the cooling air path having an upstream portion that extends axially in the direction from the opposite end of the motor toward the drive end of the motor, and the cooling air path having a downstream portion that extends axially in the direction from the drive end of the motor toward the opposite end of the motor.
• the invention also provides a method of mounting a centrifugal blower in a vehicle, the method comprising providing a centrifugal blower as described above, and mounting the blower in a vehicle such that the central axis extends non-vertically and non-horizontally, and such that the inlet of the cooling air path is substantially directly below the axis.
• FIG. 1 is an elevational view, partially in section, of a centrifugal blower embodying the invention.
• FIG. 2 is an enlarged portion of FIG.1.
• FIG. 3 is a cut-out view of the cooling channel of a blower that is another embodiment of the invention, with the motor holder oriented vertically, illustrating the motor cooling air path.
• FIG. 4 is a cut-out view of the cooling channel of FIG. 3, with the motor holder oriented horizontally, with the motor cooling hole facing downward.
• FIG. 5 is a partially transparent perspective view of the cooling channel of FIG. 3.
• FIG. 6 is a partial sectional view of a blower that is another embodiment of the
• FIG. 7 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 8 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 9 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 10 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 11 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 12 is a partial sectional view of a blower that is another embodiment of the invention.
• FIG. 13 is a partial top plan view of the blower of FIG. 12.
• FIG. 14 is a partial sectional view of an alternative blower with the cover in an open position.
• FIG. 15 is a view of the blower of FIG. 14 with the cover in its closed position.
• FIGS. 1 and 2 A centrifugal blower 10 embodying the invention is illustrated in FIGS. 1 and 2.
• the blower 10 comprises a centrifugal fan 20, a motor 30 drivingly connected to the fan 20, a blower housing 40, a motor housing 50 and a motor flange 60.
• the foregoing components of a centrifugal blower are well known in the art. It is understood by those skilled in the art that the blower housing 40, motor housing 50 and motor flange 60 can have various constructions and can be formed in many ways, such that any parts can be formed separate or integrally. Also, the blower 10 can be mounted in a vehicle in various ways.
• the centrifugal fan 20 includes a hub 70 that rotates about a central axis 74.
• the motor flange 60 and the hub 70 define therebetween an axial gap 78, the significance of which is explained below.
• the fan 20 also includes a plurality of blades 82 coupled for rotation with the hub 70.
• the illustrated fan is only one type of fan to which the invention applies. The invention is also applicable, for example, to a forward curved fan.
• the motor 30 has a drive end (the upper end in FIG. 1) and an opposite end (the lower end in FIG. 1).
• the motor 30 includes a drive shaft 86 that extends from the drive end of the motor and along the axis 74 and that is drivingly connected to the hub 70 of the fan 20.
• the motor 30 has therethrough an airflow path for cooling the motor.
• the motor airflow path has an inlet near the lower end of the motor 30 and an outlet near the upper end of the motor.
• the blower housing 40 cooperates with the motor flange 60 to form a volute or scroll, as is known in the art.
• the volute defines a space 90 in which the fan 20 is substantially enclosed, the space 90 having an inlet 94 and an outlet 98 (FIG. 1), which are the inlet and outlet of the blower 10. It is understood by those skilled in the art that the volute can be defined by the blower housing alone, or in other ways.
• the motor housing 50 supports the motor 30.
• the motor housing 50 is defined in part by the motor flange 60 . More particularly, a generally cylindrical part 102 of the motor flange 60 extends downwardly around the upper part of the motor 30.
• the motor housing 50 also includes a separate cover 106 that extends in part over the lower end of the motor 30.
• the motor flange 60 is connected to the blower housing 40 and cooperates with the blower housing to form the volute, as described above.
• the motor flange 60 has a generally bell-shaped surface 110 that forms part of the volute and that is in closely-spaced, facing relationship with the lower edges of the fan blades.
• the motor flange 60 also has a generally cylindrical surface 114 that extends generally parallel to, or is centered on, the axis 74, and that extends downwardly from the lower end of the bell-shaped surface 110.
• the blower 10 also includes a cooling air path (indicated by the arrows in FIG. 2) defined in the illustrated construction by the motor flange 60 and by the cover 106.
• the cooling air path could be defined by other parts of the blower.
• the cooling air path has an inlet 124 located in the surface 114 of the motor flange 60, so that the inlet 124 communicates with the interior space 90 of the volute.
• the inlet 124 is located near the upper edge of the surface 114.
• the inlet can be located near the lower edge of the surface 114, or somewhere in between.
• FIG. 5 shows the inlet 124 near the lower edge of the surface, while FIG.
• the cooling air path 14 shows another construction with the inlet 124 near the upper edge of the surface,
• the cooling air path also has an outlet 128 communicating with the inlet of the motor airflow path, i.e., with the cooling air inlet of the motor 30.
• the cooling air path has an upstream portion 132 that extends radially inwardly and axially upwardly from the inlet 124.
• the upstream portion 132 of the cooling air path is defined in part by a ramped surface 136 on the cover 106, and in part by a generally downwardly facing surface 140 on the motor flange 60.
• the upstream portion 132 of the cooling air path also includes a wall 144 that extends downwardly toward and terminates at a point spaced above the ramped surface 136.
• the upstream portion 132 further includes a dam 148 that extends upwardly from the ramped surface 136 at the innermost end of the ramped surface 136.
• the dam 148 and the wall 144 create a labyrinth structure that resists downstream water flow in the upstream portion 132 of the cooling air path.
• the upstream portion 132 has a low point adjacent the inlet 124 and a high point adjacent the downstream or innermost end of the upstream portion 132.
• the high point is defined by the top of the dam 148, but the high point can, in alternative constructions, be defined by other structure. Also, it should be understood that the dam 148 does not have to be located at the innermost end of the ramped surface 136.
• a line from the low point to the high point defines an angle of greater than approximately ten degrees with respect to horizontal, and preferably greater than about twenty degrees.
• the cooling air path also has a downstream portion 152 that extends axially or downwardly from the radially inward end of the upstream portion 132, and that extends substantially the entire length of motor 30.
• the downstream portion 152 is defined on the outside by the cover 106 and on the inside by the cylindrical portion 102 of the flange 60 and by the motor 30.
• the cover 106 includes an axial portion 162 that extends upwardly and over the cylindrical portion 102 of the motor flange 60. Extending outwardly and downwardly from the upper end of the axial portion 162 is an angled portion 166 that includes the ramped surface 136.
• FIGS. 3 through 5 partially illustrate another embodiment of the invention. Common elements have been given the same reference numerals, although the construction of the common elements may differ somewhat.
• a blower assembly 200 includes two parts, a motor flange 60 and an end cover or cap 106. These two parts are assembled to form an enclosed cooling air path from the volute to the end of the motor 30 opposite the drive shaft.
• FIG. 3 shows the direction of the cooling airflow.
• FIG. 3 shows the cover 106 forming an inclined surface 136 which starts at a low elevation at the inlet end 124 of the cooling channel and which then progresses to a higher elevation before turning again towards the "bottom" of the motor.
• the direction of gravity is downward in FIG 3.
• Other embodiments of the invention do not require an inclined surface, but simply a motor cooling air path that has a change in elevation, preventing water from propagating towards the motor. The greater the change in elevation, the greater the assembly can be tilted (as in a manufacturer's validation test) and prevent water from entering the motor.
• FIG. 4 the cooling hole or inlet 124 is positioned facing downward, but can in fact be positioned in any direction when the axis 74 is horizontal.
• water must enter through the fan inlet 94. The water then falls down towards the outer wall of the volute and away from the inner wall of the volute where the motor cooling hole is located.
• the blower is positioned with the axis 74 other than horizontal or vertical, it is preferable to have the inlet 124 directly below the axis 74, or in its lowermost possible position.
• This lowermost position can also be described as having the inlet 124 below the axis 74 and in a vertical plane (e.g., the plane of the paper in FIG. 4) including the axis 74.
• Putting the inlet 124 in this lowermost position minimizes the likelihood of water entering the inlet 124, because any water that has entered the blower inlet 94 will tend to flow away from the cooling air path inlet 124, which in its lowermost position faces at least somewhat downwardly.
• the inlet 124 can be located in a second plane including the axis 74, with the angle between the second plane and the vertical plane of the axis 74 being less than about fifteen degrees. In other words, the blower can be rotated about the axis 74 up to about fifteen degrees in either direction.
• FIG. 6 shows an alternative blower 300. Common elements again have the same reference numerals.
• the blower 300 has a cooling air path (indicated by arrows) including a water reservoir 304 adjacent the cooling air path inlet 124.
• the water reservoir 304 collects water that may enter the inlet to further prevent water from passing through the cooling air path.
• FIG. 7 shows an alternative blower 400.
• the upstream portion 132 of the cooling air path has a ramped surface 136 but no dam or wall.
• FIG. 8 shows an alternative blower 500.
• the upstream portion 132 of the cooling air path has a ramped surface 136 and a dam 148, but no wall.
• FIG. 9 shows an alternative blower 600.
• the upstream portion 132 of the cooling air path has a ramped surface 136, a dam 148 and a wall 144.
• FIG. 10 shows an alternative blower 700.
• the "roof of the upstream portion 132 is generally horizontal, resulting in a longer wall 144.
• the inlet 124 is located near the bottom of the surface 114. This type of flange construction is especially well suited for use with a forward curved fan.
• FIG. 1 1 shows another alternative blower 800.
• the flange 60 of the blower 800 has a portion 804 that extends locally over the inlet 124 of the cooling air path 132 to reduce ingestion of water in the cooling air path.
• This portion 804 extends a distance D farther than in other embodiments.
• FIGS. 12 and 13 show another alternative blower 900.
• the flange 60 of the blower 900 has an air scoop 904 adjacent the inlet 124 of the cooling air path.
• the scoop 904 will take advantage of the movement of the air and direct the air into the cooling air path to provide adequate air flow.
• FIGS. 14 and 15 partially illustrate another alternative blower 960.
• the motor housing 50 including the cover 106
• the cover 106 is integral with the flange 60.
• the cover 106 is formed integrally with the flange 60, including the cylindrical portion 102, such as by injection molding.
• the cover 106 is connected to the flange 60 by a living hinge 964, and the cover is movable relative to the cylindrical portion 102 between an open position (FIG. 14) and a closed position (FIG. 15).
• the flange 60 is formed or molded with the cover 106 in its open position, which facilitates the molding process, as will be understood by those skilled in the art.
• the cover is moved to its closed position to enclose the motor 30 in the motor housing.
• a suitable fastening means such as a snap-fit arrangement (not shown) between the cover 106 and the cylindrical portion 102, can be used to secure the cover in its closed position.
• the cover 106 includes the axial portion 162 and the angled portion 166

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Motor Or Generator Cooling System (AREA)
• Air-Conditioning For Vehicles (AREA)
• Supercharger (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38057585

Family Applications (1)

Country Status (10)

Cited By (5)

Families Citing this family (24)

Citations (3)

Family Cites Families (31)

• 2006
  • 2006-02-01 US US11/345,478 patent/US7699587B2/en not_active Expired - Fee Related
• 2007
  • 2007-01-12 CN CN2007800043151A patent/CN101378922B/zh not_active Expired - Fee Related
  • 2007-01-12 KR KR1020087021191A patent/KR101040844B1/ko not_active Expired - Fee Related
  • 2007-01-12 EA EA200801787A patent/EA014033B1/ru not_active IP Right Cessation
  • 2007-01-12 AT AT07717277T patent/ATE501877T1/de not_active IP Right Cessation
  • 2007-01-12 EP EP07717277A patent/EP1993864B1/en not_active Not-in-force
  • 2007-01-12 WO PCT/US2007/060439 patent/WO2007089964A1/en not_active Ceased
  • 2007-01-12 DE DE602007013186T patent/DE602007013186D1/de active Active
  • 2007-01-12 BR BRPI0706797-6A patent/BRPI0706797A2/pt not_active IP Right Cessation
  • 2007-01-12 JP JP2008553434A patent/JP5237118B2/ja active Active

Patent Citations (3)

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