Abstract: A motor-pump unit is provided that has at least two internal gearwheel pumps axially aligned that are driven off of the rotor of the electric motor. The rotor of the electric motor is U-shaped and is concentrically disposed about the pump. The web of the U-shape is disposed in the region of the rotational axis with internal toothing that meshes with pinions of the at least two internal gearwheel pumps.

Abstract: An air treatment enclosure includes a housing having a fresh air inlet. A baffle is located at the inlet to cause the air to take a flow path having a 90° turn. The air also takes a 90° turn when flowing through an L-shaped plenum in the housing. The side walls and top wall and bottom wall are detachably connected together. A base manifold is located below the bottom wall.

Abstract: A fan (10) is disclosed having a downrod (11), a motor (12), a motor housing (13) substantially encasing the motor (12), and blades (14) mounted to the motor housing (13). Each blade (14) has an air intake scoop (16 adjacent to and extending from the motor housing (13). The interior space (17) created by the intake scoop (16) is in fluid communication with an opening (18) extending through the motor housing (13). Rotational movement of the air intake scoops (16) create airstreams which are directed to the electric motor for ventilation purposes.

Abstract: A reciprocating compressor includes a compressing unit placed over a motor unit. A crankshaft, which converts rotating action of the motor unit into reciprocating action of a piston of the compressing unit, has (a) a centrifugal pump prepared at a lower section of the crankshaft, and (b) a pair of spiral pumps that communicate with the centrifugal pump and have leading grooves running in an opposite direction to each other. The crankshaft also includes a pair of eccentric paths at its upper section. The eccentric paths open into an enclosed container and communicate with the spiral pumps respectively. This structure allows producing greater force for transferring lubricant oil regardless of rotating directions of the crankshaft.

Abstract: A hermetic rotary compressor including a housing having an oil sump formed therein; a stationary shaft fixedly mounted in the housing, a longitudinal bore formed in the shaft; and a motor mounted in the housing, the motor having a rotor and a stator, the rotor having a first and second end and being rotatably mounted on the shaft. A pair of compression mechanisms is rotatably mounted on the shaft, the compression mechanisms rotatably coupled to the rotor and lubricated with oil conducted through the longitudinal bore. Each of the compression mechanism has an outboard bearing rotatably mounted on the shaft, and an oil pump in fluid communication with the longitudinal bore is also mounted on the stationary shaft, the pump operatively engaged with one of the outboard bearings. The oil pump is actuated by rotation of one of the outboard bearings, and oil is pumped from the sump into the longitudinal bore by the oil pump.

Abstract: A fan (10) is disclosed having a downrod (11), a motor (12), a motor housing (13) substantially encasing the motor (12), and blades (14) mounted to the motor housing (13). Each blade (14) has an air intake scoop (16 adjacent to and extending from the motor housing (13). The interior space (17) created by the intake scoop (16) is in fluid communication with an opening (18) extending through the motor housing (13). Rotational movement of the air intake scoops (16) create airstreams which are directed to the electric motor for ventilation purposes.

Abstract: A fluid pump (10) with a first sub-housing (12) having an electric motor (14) therein which is in line with a second sub-housing (16) having an impeller (18) therein, with the motor (14) having a rotor shaft (20) which extends through a seal (74) of the first sub-housing (12) into the second sub-housing (16), with the impeller (18) mounted on the rotor shaft (20) so as to be rotatable by the motor (14), and the second sub-housing (16) having inlet and outlet ports (81, 83). Impeller (18) has first and second annular plates (62, 64) which are axially spaced, an angularly spaced, from the inner periphery of the first annular plate (62) and by which the impeller (18) is mountable on the shaft (20) for rotation therewith. The impeller (18) further includes a plurality of circumferentially spaced connectors (70) which extend between the first annular plate (62) and an outer peripheral surface of the hub (68) and which secure the hub (68) in relation to the first plate (62).

Abstract: An air pump is provided with a motor body having an air slot to allow air to flow from the air slot to air inlets positioned in a front sealing cap of the motor body. The air inlets are aligned with air holes in a closed housing. A shaft of the motor body extends into the closed housing which houses a piston. The shaft of the motor body is connected to gearing mechanisms in the closed housing to provide reciprocating motion of the piston. The piston includes an air inlet and a valve. The reciprocating movement of the piston causes air to travel through the piston into a cylinder above the piston. The design of the pump affords a cooling function to both the motor body and cylinder while reducing the noise of the pump.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: A hermetic motor-driven compressor is capable of decreasing both the resonance sound due to an oil feed pipe and the resonance sound due to a crankshaft generated when the oil feed pipe is rotated while being dipped in the refrigerating machine oil. Within a hermetically sealed enclosure, a compression component and a motor drive component are supported through an elastic support arrangement, and the compression component comprises a crankshaft adapted to be rotatively driven by the motor drive component through an eccentric portion and provided with a journal, a balance weight disposed at the eccentric portion and a coaxial oil feed pipe disposed in the balance weight so as to revolve coaxially with the journal, so that the stirring of the refrigerating machine oil can be suppressed.

Abstract: The invention relates to an electric fan, in particular, for motor vehicles, comprising an electric drive motor, a fan wheel coupled with the drive motor, and an electronic control unit for controlling the motor. In order to make the electric fan structurally more simple and more cost-effective to assemble, it is proposed that the drive motor and the control unit be arranged in a common housing, and that the housing have air vents for passage of a flow of cooling air generatable by the fan wheel, and a heat sink of the control unit be arranged at at least one air vent.

Abstract: A motor-fan assembly for a floor care appliance having an improved working air fan for increased performance and noise reduction, a working air fan housing cover having a plurality of spiral shaped grooves, and a motor cooling air fan housing cover with slot shaped vent openings for increased cooling performance. The working air fan has a larger number of blades as compared to conventional fans wherein the blades are of two different lengths arranged in an alternating pattern circumferentially on an annular shaped disc. The blades are spaced closer together to prevent the passage of debris between adjacent blades and also to reduce flow noise. The passage between the edges of the fan blades and the working air fan cover has been widened and made uniform to aid in the passage of debris over the top of the working air fan.

Abstract: The invention concerns a piston compressor, particularly a hermetically enclosed refrigerant compressor, with at least one cylinder a piston reciprocating in said cylinder, the piston being connected with a driving rod via a piston pin and having in its outer jacket surface a circumferential lubrication groove, the piston pin having a longitudinal bore, which is connected with a lubricant source. It is endeavoured to improve the lubrication. For this purpose, the longitudinal bore is open downward in the gravity direction and has a ventilation opening upward.

Abstract: A cooling fan dust guard has provided on the inner side of fan blades multiples of fins at equal distance from one another around the spindle to create disturbance as the fan blades rotate to outwardly expel the airflow so to prevent the airflow carrying dust an easy ingression of the dust into the spindle and help cool down the stator assembly.

Abstract: A hermetic refrigerant compressor including a compressor mechanism and a motor including a stator surrounded by a rotor attached to a crankshaft drivingly linked to the compressor mechanism. A first gap is formed between the rotor and stator, and a second gap is formed between the stator and the compressor mechanism. During compressor operation discharge gas expelled from the gas compression chamber travels through a discharge passage and a discharge plenum, and then through the first and second gaps. The rotor spinning during compressor operation causing a spinning vortex of refrigerant gas to occur in the discharge plenum, the vortex having an outer flow path of warmer gas and an inner flow path of cooler gas. The outer flow path of warmer gas generally travels through the second gap and the inner flow path of cooler gas generally travels through the first gap for enhanced motor cooling.

Abstract: An improved small size air compressor consists of a casing, a high pressure air generator, a power cord set and an air duct set. The high pressure air generator couples with a radiator for effectively dispersing heat generated by the high pressure air generator during operation to allow the high pressure air generator achieving optimal effect.

Abstract: A propeller-type fan including a pressure housing for improving air flow past a motor which powers the fan.

Abstract: The invention generally concerns a submersible well pumping system comprising an axially elongated housing having a diameter less than the bore hole of the well, a multi-chamber hydraulically driven diaphragm pump, suspended in the well. The pump is driven by a self-contained, closed hydraulic system, activated by an electric or hydraulic motor. The flow of working fluid into and out of the working fluid sub-chambers is controlled by a two state main valve with a means to insure the main valve is completely switched, in turn controlled by a control valve which senses the differential pressure across the working diaphragm and generates a hydraulic signal to change the state of the two state main valve, typically when either diaphragm reaches the top of the pumping stroke. Singly or in combination, the means to assure the main valve is completely switched between the two states is an energy storage device, hysterisis in the control valves and or a two position latch the main valve.

Abstract: The invention relates to a seal between a rotating part and a stationary part. At least one of the parts is provided with projections which protrude into the seal gap. According to the invention, the seal gap (5) extends approximately radially so that both parts are provided with projections which extend in an axial direction, which are located concentrically in relation to the axis of rotation of the rotating parts and which engage with each other. Said projections are configured in the form of rows of blade-like elements. This provides an effective means of sealing approximately radially extending seal gaps.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: A cooling fan dust guard has provided on the inner side of fan blades multiples of fins at equal distance from one another around the spindle to create disturbance as the fan blades rotate to outwardly expel the airflow so to prevent the airflow carrying dust an easy ingression of the dust into the spindle and help cool down the stator assembly.

Abstract: An object of the present invention is to attain the downsizing of a closed rotary compressor while realizing separation of oil from gas without any problem, and since an electric motor is constituted by a motor of a magnetic pole concentrated winding type which includes: a stator fixed to the inner wall of a closed container; a rotator rotatably supported by a rotating shaft on the inner side of said stator; a stator core constituting said stator; a plurality of cog portions and slot portions formed to said stator core; and a stator winding directly wound around each cog portion utilizing the slot portions, a protrusion dimension of the winding from the stator core is reduced, and the excellent oil separation effect can be obtained.

Abstract: A motor pump aggregate M has a housing 1 defining an oil reservoir with first and second chambers R1, R2. An electromotor 2 is driving via its motor shaft W at least one radial piston pump arrangement P1 provided within said first chamber R2. Both chambers R1, R2 are separated by a separation wall 7. A filling and pressure biasing system V is provided for said first chamber R1 in order to adjust within said first chamber R1 a predetermined oil filling level and a pre-selected oil pressure pre-biasing for said radial piston pump arrangement P1.

Abstract: In order for a compressor for refrigerant, comprising

Abstract: An electric blower includes a motor unit having a stator and a rotor, a fan unit having an impeller attached to an output shaft of the rotor, and a circuit unit having a heat-generating component for controlling electric power to the motor unit. The circuit unit is arranged in an airflow path of air expelled from an outer periphery of the impeller toward the stator and the rotor of the motor unit. The air suctioned by rotation of the impeller cools the heat-generating component in the circuit unit before cooling the stator and the rotor.

Abstract: A motor-fan assembly for a floor care appliance having an improved working air fan for increased performance and noise reduction, a working air fan housing cover having a plurality of spiral shaped grooves, and a motor cooling air fan housing cover with slot shaped vent openings for increased cooling performance. The working air fan has a larger number of blades as compared to conventional fans wherein the blades are of two different lengths arranged in an alternating pattern circumferentially on an annular shaped disc. The blades are spaced closer together to prevent the passage of debris between adjacent blades and also to reduce flow noise. The passage between the edges of the fan blades and the working air fan cover has been widened and made uniform to aid in the passage of debris over the top of the working air fan.

Abstract: A through-flow blower assembly includes a housing that carries a motor assembly. The motor assembly has a stator, and a rotor that rotates a shaft when energized. The rotor has openings therethrough. A fan shell has an axial opening and is coupled to the housing. At least one rotating fan is carried by the shaft. The rotating fan draws working air through said axial opening and exhausts the working air through an exhaust port of the housing. The rotating fan has a diameter larger than the rotor. A cooling fan is attached to the rotor and includes a fan disc and a fan ring. The fan disc is connected to the fan ring by a plurality of blades, said fan ring having an eye that is directly adjacent the rotor openings. The cooling fan has a diameter no larger than said rotor. As the rotor rotates, the cooling fan draws a portion of the working air over the motor assembly for cooling purposes. Stationary fans may be carried by the fan shell if more than one rotating fan is provided.

Abstract: A pump has a housing plate, a housing can fixed to the plate and defining a chamber on a back face thereof, a bearing sleeve in the can fixed to the plate and extending rearward from the back face along an axis, and a rotor shaft extending axially through the sleeve. Bearings support the rotor shaft in the sleeve and an impeller is carried on the rotor-shaft front end. A rotor body fixed to the shaft rear end extends axially forward in the can around the bearing sleeve. The rotor body defines an annular space around the bearing sleeve and is formed with at least one axially throughgoing passage open axially forward into the space and axially rearward into the can. A vane in the passage is angled for pumping liquid from inside the can axially forward into the space on rotation of the rotor about the axis.

Abstract: An apparatus includes a tank configured to contain air at an elevated pressure, an air compressor which is operative to supply compressed air for storage in the tank, and a base structure which supports the compressor on the tank. A mounting boss projects from the compressor into an opening in the base structure. A vibration damping structure is interposed between the mounting boss and the base structure within the opening.

Abstract: An apparatus comprises a tank, an air compressor, and a motor with an output shaft. A fan is mounted on the output shaft. A drive assembly interconnects the motor operatively with the compressor. The apparatus further includes a base structure and a shroud. The base structure is configured to support the compressor, the motor and the drive assembly on the tank. The shroud is configured to cover the compressor, the motor, the drive assembly and the base structure on the tank. The shroud has a cooling air inlet port and a cooling air outlet port. A plurality of internal wall portions of the shroud are configured to direct cooling air to flow over the motor and the compressor upon flowing through the cover from the inlet port to the outlet port under the influence of the fan.

Abstract: An apparatus includes a motor with an output shaft. A solitary air compressor is linked to the output shaft so as to be driven by the output shaft. The compressor contains a piston in a cylinder. A first fan is mounted on the output shaft to direct cooling air to the motor. A second fan is mounted on the output shaft to direct cooling air to the compressor.

Abstract: A pump has a housing plate, a housing can fixed to the plate and defining a chamber on a back face thereof, a bearing sleeve in the can fixed to the plate and extending rearward from the back face along an axis, and a rotor shaft extending axially through the sleeve. Bearings support the rotor shaft in the sleeve and an impeller is carried on the rotor-shaft front end. A rotor body fixed to the shaft rear end extends axially forward in the can around the bearing sleeve. The rotor body defines an annular space around the bearing sleeve and is formed with at least one axially throughgoing passage open axially forward into the space and axially rearward into the can. A vane in the passage is angled for pumping liquid from inside the can axially forward into the space on rotation of the rotor about the axis.

Abstract: A radial blower, particularly for heating and air-conditioning systems for automobiles, has a spiral blower housing that is provided with an air intake (5) in a housing lateral wall and with an air outlet out of the spiral housing. A blower drive motor for a fan wheel is mounted to the housing with the fan wheel positioned in the spiral housing to face the air intake (5). The fan wheel has a fan ring with fan blades and a hub. The fan ring and the hub are connected to each other by a shell shaped vaulted or dished fan disk, which at least partly surrounds the drive motor. Fan disk openings (43) permit at least a portion of cooling air flowing through the drive motor to be discharged through the disk openings (43) into a blower air discharge chamber (23) in the spiral housing.

Abstract: A sealed compressor incorporates a relatively thin counterweight. The relatively thin counterweight is able to fit within a much smaller space than prior art cast counterweights. The relatively thin counterweight allows the reduction of the overall length of the sealed compressor, and thus provides very valuable benefits.

Abstract: A gas-fired forced draft air heating furnace is provided with a specially designed self-cooling draft inducer fan that overlies an inshot-type burner section of the furnace and is operatively supported on a heat exchanger plenum portion of the furnace housing. The fan motor is supported on an outboard housing side of the fan, and an umbrella cooling fan is coaxially secured to an outboard end of the fan drive shaft. During operation of the draft inducer fan, the umbrella fan is rotationally driven to direct a flow of ambient cooling air toward the outboard side of the draft inducer fan housing in a manner causing the air flow to sequentially contact and cool the outer shaft end bearing area, the motor windings and the inner shaft end bearing area at the outer side of the draft inducer fan housing.

Abstract: A cooling fan is fitted to one of the shaft end portions of a double-end motor, and a pulley is fitted to the other end portion. A belt is passed around this pulley and a pulley fitted to a compressor element, and the compressor element is driven by this belt. The compressor element is disposed in such a manner as to be stacked up in an upward direction of the motor. An exhaust duct having a built-in cooler is also disposed in such a manner as to be stacked up above a cooling fan on the discharge side of the cooling fan. A main duct is formed on the suction side of the cooling fan and is interconnected in series with a cooling air outlet of the compressor element. These members described above are accommodated inside a casing. Therefore, two cooling air flow passages are defined on the right and left sides inside the casing.

Abstract: Disclosed is a motor and pump which operate completely submerged in the pump fluid which uses surrounding fluid to cool the heat generated within the motor. The motor is also built with the intention that it can run in non-submerged applications by placing a cooling jacket around the stator portion of the motor and passing a cooling fluid through the jacket to absorb the motor heat. The cooling system disclosed is such that it can be filled with a fluid circulated within the system but not in direct contact with the fluid being pumped within the pump. Preferably the cooling system includes a flow control tube for use in controlling the flow rate of the cooling liquid and an expansion tank for use in limiting the pressure of the cooling fluid in the cooling system.

Abstract: A hand-held vacuum/blower device has a housing with an interior and a drive motor arranged in the interior. The drive motor has a drive shaft. A blower spiral is connected to the housing. The blower spiral has a first and a second radial end faces and each one of the radial end faces has at least one air inlet opening. A blower wheel is arranged in the blower spiral and coupled to the drive shaft. A venting wheel is coupled to the drive shaft for conveying cooling air from the exterior of the housing to the drive motor in the interior of the housing. The blower wheel has a hub and a wall connected to the hub and extending to the periphery of the blower wheel. The wall has a first end face facing the first radial end face and a second end face facing the second radial end face. The blower wheel includes first and second vanes wherein the first vanes are connected to the first end face of the wall and the second vanes are connected to the second end face of the wall.

Abstract: Cooling means for cooling an electric motor mounted on or adjacent a volute of a centrifugal fan, the cooling means including an opening through the wall of the volute, and a shroud connected to the volute, the shroud including a volute end and a motor end, wherein the volute end of the shroud substantially covers the opening, and the motor end of the shroud extends around at least a portion of the periphery of the electric motor, such that the shroud provides a passage for flow of air from the volute and directs the flow of air around at least a portion of the periphery of the motor.

Abstract: A pressure compensator for a sub-sea pumping system for pumping an effluent from a deep-sea wellhead comprising a topside module, a sub-sea module, and an umbilical connection between the topside and sub-sea modules. Hydraulic fluid is circulated through the sub-sea module for cooling and lubricating the motor and the pump. The hydraulic cooling and lubricating fluid is preferably a single hydraulic fluid that is compatible with the effluent being pumped. The hydraulic fluid is circulated through a submerged pressure compensator which may include a bellows assembly. The pressure compensator is responsive to the pressure of the effluent being pumped and pressurizes the hydraulic cooling and lubricating fluid to a pressure above the pressure of the effluent. The pressure compensator also responds when the volume of hydraulic cooling and lubricating fluid in the system is reduced or increased, such as by leakage or thermal expansion, in order to maintain the pressure of the hydraulic fluid.

Abstract: The invention relates to a high-pressure pump for fuel delivery in fuel injection systems of internal combustion engines, which includes a tank, a pre-feed pump, and the high-pressure pump. The pre-feed pump aspirates a total fuel flow from the tank and this total fuel flow is divided into a lubricating flow, which is conveyed through the high-pressure pump for the purpose of lubrication, and a delivery flow, which is acted on with high pressure by the high-pressure pump and is delivered to a common distributor rail. The fuel injection system prevents damage that could occur during operation. Damage is prevented because the total fuel flow is conveyed through the high-pressure pump for the purpose of lubrication, wherein a metering unit for the total fuel flow is provided in the high-pressure pump or in a return and assures that only a predetermined delivery flow is acted on with high pressure in the high-pressure pump.

Abstract: The invention relates to a single flow friction vacuum pump (1) with a housing (4, 5) in which an inlet (2), the active pumping surfaces (8, 9) and a drive motor (11) are arranged axially behind each other; in order to effectively air-cool the pump, it is proposed that its housing walls be equipped with air intake and air discharge openings and that a fan (23) be integrated in its housing (4, 5). (Drawing FIG.

Abstract: The flow, use, interaction and separation of lubricant and gas flowing through the suction pressure portion of a low-side refrigeration scroll compressor is managed by the use of a multi-ported frame in conjunction with separate suction gas supply and lubricant return passages cooperatively defined by the compressor shell and the stator of the motor which drives the compressor.

Abstract: A fan and electric motor combination (or a fan adapted to be used in such a combination) which provides improved cooling for the motor, using a centrifugal impeller including rotating impeller blades. The impeller blades span between an impeller inlet and an impeller outlet, and they rotate to assist cooling airflow for the motor. Cooling airflow is also assisted by the position of the impeller in that the impeller outlet is positioned upstream of an intersection of the fan blade trailing edge and the hub. Therefore, cooling airflow is assisted by at least some (preferably all) of the pressure drop across the axial fan. If the impeller outlet is positioned still further upstream, e.g., upstream of an intersection of the fan blade leading edge and the hub, then the motor cooling airflow is assisted by all or nearly all of the pressure drop across the axial fan.

Abstract: A motor driven fan assembly is disclosed wherein a hub has a plurality of fan blades which extend radially outwardly therefrom and is fixed to an air cooled brushless motor for rotation, such that when the hub is rotatably driven by the motor, the fan blades create an atmospheric pressure differential defined by a higher pressure region downstream of the blades and a lower pressure region upstream of the blades. The hub has an opening dimensioned and located to communicate with cooling air openings in the motor. A cooling air directing plate is positioned axially upstream of the hub to define an air directing space with the motor and the hub, and the space communicates the lower pressure region with the higher pressure region through a cooling air path in the motor and the hub opening to cool the motor. A method of cooling such fan driving motor of the brushless type is also disclosed.

Abstract: A gas premix burner in which gas and air are mixed in a suction region of an impeller to form a combustion mixture. The impeller is associated with a blower housing and an electronic control circuit board, all of which are arranged upstream in a blower chamber having at least one flame separating wall. The arrangement prevents the gas and the combustion mixture from reaching the motor landings or the printed circuit board.

Abstract: The motor comprises a rotor (30) fixed for rotation with a shaft (36) of a member to be driven and a crown-like stator (10) obtained by blanking a lamination stack (12) provided with coil supporting teeth (11). Within the stator crown (10) there are obtained by blanking the lamination stack (12) a plurality of receptacles (13, 15, 17) for seating electric and electronic components associated with the stator. The components comprise a transformer (24), an inductance coil (25), and a plurality of MOSs (23). The stator crown (10) is co-molded with a covering of electrically insulating plastic material to cover the receptacles (13, 15, 17) and the teeth (11) and form a tank (22) for receiving a printed circuit (21). The permanent magnet rotor is fitted with stacks of small pieces (19) obtained by blanking lamination portions within the stator crown (10). The stacks of small pieces face the magnets (31) so as to close the respective magnetic circuits.