US20070077138A1 - Fluid pumping system - Google Patents
Fluid pumping system Download PDFInfo
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- US20070077138A1 US20070077138A1 US11/529,543 US52954306A US2007077138A1 US 20070077138 A1 US20070077138 A1 US 20070077138A1 US 52954306 A US52954306 A US 52954306A US 2007077138 A1 US2007077138 A1 US 2007077138A1
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- vane
- portions
- axial end
- vane portions
- wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/188—Rotors specially for regenerative pumps
Definitions
- the present invention relates to a fluid pumping system with an impeller for pumping a fluid.
- a double vane type vortex flow pump (i.e., vortex pump) is usually used as the motorized air pump.
- the flow pump includes a housing having a pump chamber therein and a vane wheel (i.e., an impeller) that is rotatably mounted in the housing.
- the vane wheel has multiple vane portions (i.e., fins) rotationally driven by an electric motor.
- Japanese Published Examined Application No. 2004-109909 discloses a system in which the number of fins is N and the rotational speed of a motor is S (rpm). A value, F, obtained by multiplying N and S is set to a value higher than a human audible frequency band Fh (i.e., not more than 20 kHz).
- the multiple fins 101 are perpendicular to the direction of rotation of an impeller 102 similar to the motorized air pump described in Japanese Patent Publication No. 11-107980.
- the angle of incline ⁇ of the fins is 0°.
- a separation vortex due to separation of the flow of secondary air is produced from the ends of the fins 101 on the side of a suction opening to the opposite ends in the direction of rotation, as illustrated in FIG. 6B .
- This produces turbulence noise which is undesirable.
- the main exciting force which is highest in noise level among vortex pump noises, is the turbulence noise (20 kHz or below) in the pump chamber.
- a fluid pumping system includes a housing in which a fluid flows.
- the fluid pumping system also includes a vane wheel that is rotatably supported in the housing and that has a plurality of vane portions. At least one of the vane portions is swept-forward such that an axial end of the at least one of the vane portions extends toward the direction of rotation of the vane wheel.
- a vehicle secondary air supply apparatus for warming of a catalyst includes a housing in which a fluid flows.
- the fluid pumping system also includes a vane wheel that is rotatably supported in the housing and that has a plurality of vane portions. At least one of the vane portions is swept-forward such that an axial end of the at least one of the vane portions extends toward the direction of rotation of the vane wheel.
- a fluid pumping system includes a housing in which a fluid flows and a vane wheel that is rotatably supported in the housing.
- the vane wheel includes an annular dividing wall, a plurality of first vane portions, and a plurality of second vane portions.
- the first and second vane portions are curved in the radial direction of the vane wheel.
- the annular dividing wall is provided between the first and second vane portions.
- the first vane portions are swept forward from the annular dividing wall such that an axial end of the first vane portions extend toward the direction of rotation of the vane wheel.
- the second vane portions are swept forward from the annular dividing wall such that an axial end of the second vane portions extend toward the direction of rotation of the vane wheel.
- FIG. 1 is a schematic diagram of one embodiment of a secondary air supply system
- FIG. 2 is a sectional view of a motor air pump for use in the secondary air supply system of FIG. 1 ;
- FIG. 3A is a front view of one embodiment of an impeller for use in the secondary air supply system of FIG. 1 ;
- FIG. 3B is a bottom, projected view of the impeller of FIG. 3A ;
- FIG. 4A is a bottom, projected view of the impeller of FIG. 3A ;
- FIG. 4B is a sectional view of the impeller of FIG. 3A ;
- FIG. 4C is a bottom, projected view of another embodiment of the impeller.
- FIG. 5 is a graph comparing noise level of the impeller of FIG. 3A to those of the prior art
- FIG. 6A is a bottom, projected view of an impeller of the prior art
- FIG. 6B is a sectional view of an impeller of the prior art.
- FIG. 7 is a graph illustrating the relationship between noise level and angle of incline for the impeller of FIG. 3A .
- an impeller of a fluid pumping system in order to suppress the production of turbulent flows due to flow separation and thereby reduce turbulence noise, is disclosed that includes at least one vane portion that is swept-forward and inclined toward the direction of rotation.
- a motor air pump 1 is incorporated into a secondary air supply system (i.e., secondary air supply apparatus).
- secondary air i.e., fluid
- the secondary air supply system guides this secondary air into a three-way catalyst converter 13 to facilitate warming of a three-way catalyst.
- This secondary air supply system is mounted in, for example, the engine compartment of a vehicle, such as an automobile.
- the motor air pump 1 and a secondary air control valve 14 are hermetically connected to each other through the secondary air channel pipe 11 .
- the secondary air control valve 14 and an engine exhaust pipe 15 are hermetically connected to each other through the secondary air channel pipe 12 .
- the engine E obtains output by thermal energy obtained by burning air/fuel mixture of intake air and fuel in combustion chambers.
- the engine E includes a cylinder block that slidably supports pistons 16 .
- the engine E also includes a cylinder head with intake ports joined with the downstream end of an engine intake pipe 17 that includes an intake manifold.
- the engine E further includes an exhaust manifold and exhaust ports joined with the upstream end of the engine exhaust pipe 15 .
- the intake ports and the exhaust ports are opened and closed by intake valves and exhaust valves, respectively.
- spark plugs 18 with tips that are exposed in the combustion chambers.
- electromagnetic fuel injection valves 19 i.e., injectors
- the engine intake pipe 17 there are intake air passages that connect to the combustion chambers of the engine E through the intake ports. Intake air sucked into the combustion chambers of the engine E flows in the intake air passages.
- an air cleaner 20 is included that filters intake air and a throttle valve 22 that performs opening/closing operation in correspondence with the amount of accelerator pedal 21 depression (i.e., accelerator opening).
- the engine exhaust pipe 15 there are formed exhaust passages that connect to the combustion chambers of the engine E through the exhaust ports. Exhaust gas flows out of the combustion chambers of the engine E toward the three-way catalyst converter 13 .
- An O 2 sensor 23 is supported in the engine exhaust pipe 15 and detects the oxygen concentration of exhaust gas.
- a catalyst temperature sensor 24 is also included that detects the temperature of the three-way catalyst. Furthermore, an exhaust gas temperature sensor (not shown) is included in the exhaust pipe 15 for detecting the temperature of exhaust gas. It will be appreciated that other sensors and the like can be included in the exhaust pipe 15 .
- Secondary air channels are included in the secondary air channel pipes 11 , 12 for guiding secondary air, pressure-fed and supplied from the motor air pump 1 , to the three way catalyst converter 13 through the engine exhaust pipe 15 .
- the secondary air control valve 14 is an electromagnetic fluid control valve (or motor-operated fluid control valve) formed by integrating an air switching valve (hereafter, referred to as ASV) and a check valve.
- ASV air switching valve
- the ASV opens and closes the secondary air channel formed in the secondary air channel pipe 12 , and the check valve prevents fluid, such as exhaust gas, from flowing from the joint between the secondary air channel pipe 12 and the engine exhaust pipe 15 back toward the ASV
- the check valve has a film lead valve that is opened by the pressure of secondary air discharged from the motor air pump 1 .
- the secondary air supply system is in communication with an engine control unit (not shown).
- the engine control unit (hereinafter, ECU) electronically controls an electric motor 2 .
- the electric motor 2 is the power source of the motor air pump 1 .
- the ECU also controls an actuator (not shown), which is the power source of the secondary air control valve 14 .
- the ECU controls the electric motor 2 and the actuator based on the state of operation of the engine E.
- the ECU is provided with a microcomputer of publicly known structure.
- the ECU operates as a CPU that carries out control processing and computation processing, a storage device (i.e., memory such as ROM and RAM) that stores various programs and data, and the like.
- the ECU operates as a pump control unit.
- the ECU adjusts power supplied to the electric motor 2 to control the rotational motion (e.g. rotational speed) of the motor air pump 1 based on a control program stored in memory.
- the ECU detects the exhaust gas temperature with the exhaust gas temperature sensor. When the detected exhaust gas temperature is equal to or lower than a predetermined value, the ECU drives and opens the secondary air control valve 14 . Since power is also supplied to the motor air pump 1 at this time, a secondary airflow is generated in the secondary air channels formed in the secondary air channel pipes 11 , 12 .
- the ECU has a fault diagnosis function for diagnosing anomalies and faults in the motor air pump 1 .
- a pressure sensor 25 is installed in the secondary air channel pipe 11 , and when the secondary air pressure detected by the pressure sensor 25 is out of a predetermined pressure range, an anomaly is detected.
- the motor air pump 1 is a double vane type vortex motor air pump.
- the motor air pump 1 includes the electric motor 2 operated with electric power, a pump housing 4 coupled to the motor housing 3 of the electric motor 2 , an air duct 5 hermetically joined with the pump housing 4 , a filter 6 provided in the air duct 5 , a pump impeller 7 (i.e., air pump body) rotatably supported in the pump housing 4 and rotationally driven by the electric motor 2 , and the like.
- the electric motor 2 is a direct-current (DC) motor.
- This electric motor 2 includes a field (stator) 33 with multiple permanent magnets 32 on the inner circumferential surface of a cylindrical yoke 31 .
- the motor 2 also includes an armature (rotor) 34 provided on the inner circumferential surface of the field 33 .
- the motor 2 further includes a brush assembly 37 with multiple brushes 36 to be abutted against the commutator 35 provided in the armature 34 in the motor housing 3 .
- the motor 2 could be of any suitable type, such as a brushless direct-current (DC) motor or an alternating-current (AC) motor, such as a three-phase induction motor.
- the armature 34 includes a motor shaft 41 (i.e., a rotating shaft or the output shaft of the electric motor 2 ).
- the motor shaft 41 is rotatably supported in the motor housing 3 .
- the armature 34 also includes an armature core 42 secured on the outer circumferential surface of the motor shaft 41 .
- the armature 34 further includes multiple armature coils (i.e., armature windings) wound on the armature core 42 .
- the armature 34 additionally includes multiple commutators 35 connected in correspondence with the respective armature coils.
- the brush assembly 37 includes multiple brushes 36 pressed against the commutators 35 and multiple brush holding members 44 that hold the brushes 36 toward the commutators 35 so that the brushes can slide.
- the brush assembly 37 further includes multiple springs 45 that energize the individual brushes 36 toward the commutators 35 and a spacer 46 that supports the brush holding members 44 in the motor housing 3 .
- the pump housing 4 includes a first case 52 coupled to the motor housing 3 by screws 51 and a second case 54 coupled to the first case 52 by clips 53 .
- An annular swirl chamber 57 (i.e., pump chamber) is provided in the pump housing 4 for compressing air due to rotation of the impeller 7 .
- the air duct 5 is connected to the first case 52 for directing the air into the swirl chamber 57 .
- First and second C-shaped side grooves 58 , 59 are provided in the peripheral portion of the swirl chamber 57 in the radial direction and have respective bottom faces with semi-circular sectional shape.
- the filter 6 is provided in the air duct 5 for filtering the air sucked into the impeller 7 .
- the filter 6 catches foreign matter mixed in air to prevent the entry of the foreign matter into the swirl chamber 57 .
- air flowing in through the open end (i.e., air inlet) of the air duct 5 can pass through the filter 6 .
- a filter case 9 is hermetically connected to the upstream end of the air duct 5 , and the filter 6 is placed in the filter case 9 . It will be appreciated that the filter 6 need not be placed in the air duct 5 .
- first case 52 there is formed a pump suction opening 56 for sucking the air from the air channel 55 formed in the air duct 5 into the swirl chamber 57 .
- second case 54 there is formed a pump discharge opening (not shown) for discharging air from the swirl chamber 57 .
- a dividing plate i.e., partitioning portion—not shown) for preventing air from directly flowing from the pump suction opening 56 into the pump discharge opening.
- the impeller 7 is rotatably housed in the swirl chamber 57 of the pump housing 4 .
- the impeller 7 is a double vane type vane wheel having a plurality of vane portions (i.e., blades, fins, etc.) and a plurality of vane grooves.
- the impeller 7 pressurizes the air sucked into the swirl chamber 57 and discharges the pressurized air.
- the impeller 7 has a disk-shaped rotor portion 61 (i.e., main body) secured on the outer circumferential surface of the axial end of the motor shaft 41 of the electric motor 2 so that the impeller 7 is unlikely to rotate relative to the motor shaft 41 .
- vane portions 62 , 63 On the outer radial portion of the rotor portion 61 , there are formed a plurality of vane portions 62 , 63 .
- the vane portions 62 , 63 are disposed in spaced relationship to each other around the circumference of the rotor portion 61 . In one embodiment, the vane portions 62 , 63 are equally spaced away from each other around the circumference of the rotor portion 61 .
- the vane portions will be hereafter referred to as multiple first vane portions 62 and second vane portions 63 ).
- Vane grooves 64 , 65 are defined between the vane portions 62 , 63 . (The vane grooves will be hereafter referred to as first vane grooves 64 and second vane grooves 65 .)
- the first vane portions 62 and the first vane grooves 64 are provided on the upstream side of the secondary air flow (i.e., the right side in FIG. 2 ).
- the first vane portions 62 and first vane grooves 64 curve radially away from the rotor portion 61 .
- the first vane portions 62 and the first vane grooves 64 are concave and curved from an inner radius end to an outer radius end in the direction of the radius of the rotor portion 61 .
- the first vane portions 62 and the first vane grooves 64 are curved toward the direction of rotation of the impeller 7 (i.e., toward the direction of the arrow in FIG. 3A and toward the direction of the arrow in FIG. 4A ).
- the second vane portions 63 and the second vane grooves 65 are provided on the downstream side of the secondary air flow (i.e., the left side in FIG. 2 ). As shown in FIG. 3 , the second vane portions 63 and the second vane grooves 65 curve radially away from the rotor portion 61 . As such, the second vane portions 63 and the second vane grooves 65 are concave and curved from an inner radius end to an outer radius end in the direction of the radius of the rotor portion 61 . The second vane portions 63 and the second vane grooves 65 are curved toward the direction of rotation of the impeller 7 (i.e., toward the direction of the arrow in FIG. 3A and toward the direction of the arrow in FIG. 4A ).
- each of the first vane portions 62 include a respective first end 70 and a respective second end 72 (i.e., axial end).
- each of the second vane portions 63 includes a respective first end 71 and a respective second end 73 (i.e., axial end).
- the first ends 70 , 71 of the first and second vane portions 62 , 63 are provided near the center of the impeller 7 in the direction of the rotational axis of the impeller 7
- the second ends 72 , 73 of the first and second vane portions 62 , 63 are provided on opposite axial ends of the impeller 7 in the 15 direction of the rotational axis of the impeller 7 .
- first and second vane portions 62 , 63 correspond with suction openings (i.e., leading edges, ridgelines on the upstream side in the direction of the flow of fluid) of the impeller 7 .
- first ends 70 , 71 of the first and second vane portions 62 , 63 correspond with discharge openings (i.e., trailing edges, ridgelines on the downstream side in the direction of the flow of fluid) of the impeller 7 .
- annular dividing wall 66 (i.e., rib) is included between the first and second vane portions 62 , 63 .
- the annular dividing wall 66 extends radially away from the rotor portion 61 and extends around the entire circumference of the rotor portion 61 .
- the annular dividing wall 66 is provided approximately at the center of the impeller 7 in the direction of the rotational axis of the impeller 7 .
- the dividing wall 66 is wider and concave at its base such that the bottom of the first and second vane grooves 64 , 65 are curved surfaces. In the embodiment shown, the curved surfaces of the dividing wall 66 are flush with the curved surfaces of the adjacent first and second side grooves 58 , 59 of the swirl chamber 57 .
- the first vane portions 62 are coupled to the annular dividing wall 66 at the respective first ends 70 thereof. Also, the second vane portions 63 are coupled to the annular dividing wall 66 at the respective first ends 71 thereof.
- each of the first and second vane portions 62 , 63 are swept forward with respect to the axis of rotation of the impeller 7 .
- each of the first and second vane portions 62 , 63 are swept forward. This means that each of the first and second vane portions 62 , 63 is inclined and extends toward the direction of rotation of the impeller 7 (i.e., inclined toward the direction of the arrow shown in FIG. 4A ).
- the second ends 72 , 73 of the vane portions 62 , 63 extend toward the direction of rotation of the impeller 7 .
- the first and second vane portions 62 , 63 are inclined at a positive angle (i.e., an angle of incline ⁇ ) relative to the dividing wall 66 such that the second ends 72 , 73 of the first and second vane portions 62 , 63 (i.e., the suction ends) are positioned ahead of the first ends 70 , 71 thereof (i.e., the discharge ends) in the direction of rotation of the impeller 7 .
- the angle of incline ⁇ of the first and second vane portions 62 , 63 is greater than zero. In one embodiment, the angle of incline ⁇ is at least 15° and at most 30° to thereby correspond reduce noise levels as shown in FIG. 7 . Further, in one embodiment, the angle of incline ⁇ is approximately 20°.
- Vehicles such as automobiles, are mounted with an exhaust gas purifier.
- Exhaust gas discharged from the combustion chambers of the engine E of a vehicle contains harmful components.
- the purifier changes elements (e.g., carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxides (NOx)) from harmful components into harmless components by chemical reaction (i.e., three way catalyst converter 13 ).
- the purifier changes hydrocarbon (HC) into harmless water (H 2 O) by oxidation.
- the three-way catalyst proper chemical reaction does not take place unless the ratio of mixture of air and fuel is equal to a theoretical air-fuel ratio when burning is carried out in the engine E. For instance, it may be required to maintain the theoretical air-fuel ration of 14.7:1.
- the three-way catalyst does not properly operate when the exhaust gas temperature is too low (approximately 350° C. or below for example), immediately after the engine E is started.
- the ECU drives and opens the secondary air control valve 14 .
- This operation is performed when the exhaust gas temperature detected with the exhaust gas temperature sensor is lower than a predetermined value, or when the temperature of the three-way catalyst detected with the catalyst temperature sensor 24 is lower than a predetermined value.
- the ECU supplies electric power (pump driving current) to the electric motor 2 of the motor air pump 1 to actuate the motor air pump 1 .
- the pressure feed and supply of secondary air by the motor air pump 1 is started.
- the air in the swirl chamber 57 of the pump housing 4 is compressed by movement of the multiple first and second vane portions 62 , 63 . Since negative pressure is produced in the pump suction opening 56 of the pump housing 4 , the air filtered through the filter 6 is guided into the pump suction opening 56 by way of the air channel 55 in the air duct 5 . Further, since high pressure is produced in the pump discharge opening of the pump housing 4 , the air pressurized in the swirl chamber 57 is discharged from the pump discharge opening.
- the air discharged from the pump discharge opening of the motor air pump 1 is fed into the three way catalyst converter 13 by way of the secondary air channel pipe 11 , secondary air control valve 14 , secondary air channel pipe 12 , and engine exhaust pipe 15 .
- the three-way catalyst is activated, and the exhaust gas is purified. For instance, because the hydrocarbon (HC) is changed into water (H 2 O) by oxidation, the amount of hydrocarbon (HC) emitted into the air is reduced.
- the first and second vane portions 62 , 63 are swept-forward blades inclined toward the direction of rotation of the impeller 7 .
- the air inflow angle at which air flows in from the second ends 72 of the first vane portions 62 between the first vane portions 62 substantially agrees with the angle of incline ⁇ of the first vane portions 62 .
- the air inflow angle at which air flows in from the second end 73 of the second vane portions 63 between the second vane portions 63 substantially agrees with the angle of incline ⁇ of the second vane portions 63 .
- the noise level (30-cm noise on the suction opening side) can be reduced by an amount equal to or larger than a predetermined value in all the audible frequency bands unlike the prior art pump, as indicated in the characteristic diagram in FIG. 5 .
- the peak value (at 1.6 kHz) of the turbulence noise (i.e., noise level) in the vortex pump is reduced by 2 dB from the motor air pump of the prior art.
- the motor air pump 1 is connected to the upstream end of the secondary air channel pipes 11 , 12 in the direction of secondary air flow that guide secondary air into the engine exhaust pipe 15 .
- the motor air pump 1 is connected at a midpoint in the secondary air channel pipes 11 , 12 .
- the motor air pump 1 is directly connected to the joint of the secondary air channel pipe 12 and the engine exhaust pipe 15 .
- the engine exhaust pipe 15 functions as air channel pipe, and the air channel functions as an exhaust passage.
- the impeller 7 is directly assembled to the motor shaft 41 of the electric motor 2 .
- the motor shaft 41 of the electric motor 2 and the rotating shaft of the impeller 7 are separately constructed.
- a speed reducing mechanism that reduces the motor rotational speed to a predetermined reduction ratio is installed between the motor shaft 41 of the electric motor 2 and the rotating shaft of the impeller 7 .
- the fluid pumping system of the invention is applied to the double vane type vortex motor air pump 1 .
- the fluid pumping system of the invention is used in a single vane type vortex motor air pump.
- air such as secondary air
- gas such as evaporated fuel or vapor-phase coolant, or liquid, such as water, fuel, oil, or liquid-phase coolant, is fluid that is pumped.
- all of the first and second vane portions 62 , 63 are swept-forward blades inclined toward the direction of the rotation of the impeller 7 . In another embodiment, less than all of the first and second vane portions 62 , 63 are swept-forward blades. In another embodiment, either the first or second vane portions 62 , 63 are swept-forward blades. Regardless, it will be appreciated that the noise level is reduced in all the frequency bands more than in the prior art.
- the first and second vane portions 62 , 63 are formed such that a portion of the vane portions 62 , 63 (e.g., the portion adjacent the first ends 70 , 71 ) extends approximately parallel to the axis of rotation of the impeller 7 , and a portion of the vane portions 62 , 63 (e.g., the portion adjacent the second ends 72 , 73 ) is swept forward toward the direction of rotation of the impeller 7 .
- the angle of incline is approximately 0° adjacent the first ends 70 , 71 .
- the second ends 72 , 73 extend toward the direction of rotation of the impeller 7 .
- the angle of incline ⁇ is provided only at the suction ends (i.e., the second ends 72 , 73 ) of the first and second vane portions 62 , 63 .
- This configuration could be applied to less than all of the first and second vane portions 62 , 63 .
- This configuration could also be applied to either one of the first and second vane portions 62 , 63 .
Abstract
Description
- The following is based on and claims priority to Japanese Patent Application No. 2005-283759, filed Sep. 29, 2005, which is hereby incorporated in its entirety by reference.
- The present invention relates to a fluid pumping system with an impeller for pumping a fluid.
- Secondary air supply apparatuses have been proposed in which secondary air produced by operating a motorized air pump flows to a three way catalyst converter through a secondary air channel pipe and an engine exhaust pipe to activate a three-way catalyst when an internal combustion engine is started. Japanese Patent Publication No. 11-107980 discloses such a system. A double vane type vortex flow pump (i.e., vortex pump) is usually used as the motorized air pump. The flow pump includes a housing having a pump chamber therein and a vane wheel (i.e., an impeller) that is rotatably mounted in the housing. The vane wheel has multiple vane portions (i.e., fins) rotationally driven by an electric motor.
- However, conventional motorized air pumps, such as the pump described in Japanese Patent Publication No. 11-107980 suffer from certain disadvantages. For instance, the vanes of the motor air pump are perpendicular to the direction of the rotation of the impeller (i.e., the angle of incline φ of the fins is 0°). For this reason, the flow of air into and between adjoining fins falls behind the rotational speed of the electric motor (i.e., the rotational speed of the impeller). As a result, a separation vortex due to separation of the flow of secondary air is produced from the ends of the fins on the side of a suction opening to the opposite ends of the fins in the direction of rotation. This produces turbulence noise, and the noise level becomes high in all the frequency bands.
- In partial response to this problem, Japanese Published Examined Application No. 2004-109909 discloses a system in which the number of fins is N and the rotational speed of a motor is S (rpm). A value, F, obtained by multiplying N and S is set to a value higher than a human audible frequency band Fh (i.e., not more than 20 kHz).
- However, as represented in
FIG. 6A , themultiple fins 101 are perpendicular to the direction of rotation of animpeller 102 similar to the motorized air pump described in Japanese Patent Publication No. 11-107980. In other words, the angle of incline φ of the fins is 0°. For this reason, a separation vortex due to separation of the flow of secondary air is produced from the ends of thefins 101 on the side of a suction opening to the opposite ends in the direction of rotation, as illustrated inFIG. 6B . This produces turbulence noise, which is undesirable. The main exciting force, which is highest in noise level among vortex pump noises, is the turbulence noise (20 kHz or below) in the pump chamber. However, conventional fluid pumping systems have not sufficiently reduced this turbulence noise. Specifically, as shown in the diagram ofFIG. 5 , the peak value of turbulence noise (noise level) in a vortex pump of the prior art is approximately 1.6 kHz. Thus, there remains a need for a fluid pump that produces less turbulence noise. - A fluid pumping system is disclosed that includes a housing in which a fluid flows. The fluid pumping system also includes a vane wheel that is rotatably supported in the housing and that has a plurality of vane portions. At least one of the vane portions is swept-forward such that an axial end of the at least one of the vane portions extends toward the direction of rotation of the vane wheel.
- A vehicle secondary air supply apparatus for warming of a catalyst is also disclosed. The apparatus includes a housing in which a fluid flows. The fluid pumping system also includes a vane wheel that is rotatably supported in the housing and that has a plurality of vane portions. At least one of the vane portions is swept-forward such that an axial end of the at least one of the vane portions extends toward the direction of rotation of the vane wheel.
- Furthermore, a fluid pumping system is disclosed that includes a housing in which a fluid flows and a vane wheel that is rotatably supported in the housing. The vane wheel includes an annular dividing wall, a plurality of first vane portions, and a plurality of second vane portions. The first and second vane portions are curved in the radial direction of the vane wheel. The annular dividing wall is provided between the first and second vane portions. The first vane portions are swept forward from the annular dividing wall such that an axial end of the first vane portions extend toward the direction of rotation of the vane wheel. Also, the second vane portions are swept forward from the annular dividing wall such that an axial end of the second vane portions extend toward the direction of rotation of the vane wheel.
-
FIG. 1 is a schematic diagram of one embodiment of a secondary air supply system; -
FIG. 2 is a sectional view of a motor air pump for use in the secondary air supply system ofFIG. 1 ; -
FIG. 3A is a front view of one embodiment of an impeller for use in the secondary air supply system ofFIG. 1 ; -
FIG. 3B is a bottom, projected view of the impeller ofFIG. 3A ; -
FIG. 4A is a bottom, projected view of the impeller ofFIG. 3A ; -
FIG. 4B is a sectional view of the impeller ofFIG. 3A ; -
FIG. 4C is a bottom, projected view of another embodiment of the impeller; -
FIG. 5 is a graph comparing noise level of the impeller ofFIG. 3A to those of the prior art; -
FIG. 6A is a bottom, projected view of an impeller of the prior art; -
FIG. 6B is a sectional view of an impeller of the prior art; and -
FIG. 7 is a graph illustrating the relationship between noise level and angle of incline for the impeller ofFIG. 3A . - In general, in order to suppress the production of turbulent flows due to flow separation and thereby reduce turbulence noise, an impeller of a fluid pumping system is disclosed that includes at least one vane portion that is swept-forward and inclined toward the direction of rotation.
- Referring to
FIG. 1 , one embodiment of amotor air pump 1 is incorporated into a secondary air supply system (i.e., secondary air supply apparatus). As will be explained, when an internal combustion engine E (e.g., a gasoline engine) is started, secondary air (i.e., fluid) flows in secondaryair channel pipes 11, 12 (i.e., fluid channel pipes, air channel pipes). The secondary air supply system guides this secondary air into a three-way catalyst converter 13 to facilitate warming of a three-way catalyst. This secondary air supply system is mounted in, for example, the engine compartment of a vehicle, such as an automobile. In the secondary air supply system, themotor air pump 1 and a secondaryair control valve 14 are hermetically connected to each other through the secondaryair channel pipe 11. The secondaryair control valve 14 and anengine exhaust pipe 15 are hermetically connected to each other through the secondaryair channel pipe 12. - The engine E obtains output by thermal energy obtained by burning air/fuel mixture of intake air and fuel in combustion chambers. The engine E includes a cylinder block that slidably supports
pistons 16. The engine E also includes a cylinder head with intake ports joined with the downstream end of anengine intake pipe 17 that includes an intake manifold. The engine E further includes an exhaust manifold and exhaust ports joined with the upstream end of theengine exhaust pipe 15. The intake ports and the exhaust ports are opened and closed by intake valves and exhaust valves, respectively. In the cylinder head, there are installedspark plugs 18 with tips that are exposed in the combustion chambers. Further, in the cylinder head, there are installed electromagnetic fuel injection valves 19 (i.e., injectors) that inject fuel toward intake valves. - In the
engine intake pipe 17, there are intake air passages that connect to the combustion chambers of the engine E through the intake ports. Intake air sucked into the combustion chambers of the engine E flows in the intake air passages. In theengine intake pipe 17, anair cleaner 20 is included that filters intake air and athrottle valve 22 that performs opening/closing operation in correspondence with the amount ofaccelerator pedal 21 depression (i.e., accelerator opening). In theengine exhaust pipe 15, there are formed exhaust passages that connect to the combustion chambers of the engine E through the exhaust ports. Exhaust gas flows out of the combustion chambers of the engine E toward the three-way catalyst converter 13. An O2 sensor 23 is supported in theengine exhaust pipe 15 and detects the oxygen concentration of exhaust gas. Acatalyst temperature sensor 24 is also included that detects the temperature of the three-way catalyst. Furthermore, an exhaust gas temperature sensor (not shown) is included in theexhaust pipe 15 for detecting the temperature of exhaust gas. It will be appreciated that other sensors and the like can be included in theexhaust pipe 15. - Secondary air channels are included in the secondary
air channel pipes motor air pump 1, to the three way catalyst converter 13 through theengine exhaust pipe 15. The secondaryair control valve 14 is an electromagnetic fluid control valve (or motor-operated fluid control valve) formed by integrating an air switching valve (hereafter, referred to as ASV) and a check valve. The ASV opens and closes the secondary air channel formed in the secondaryair channel pipe 12, and the check valve prevents fluid, such as exhaust gas, from flowing from the joint between the secondaryair channel pipe 12 and theengine exhaust pipe 15 back toward the ASV The check valve has a film lead valve that is opened by the pressure of secondary air discharged from themotor air pump 1. - The secondary air supply system is in communication with an engine control unit (not shown). The engine control unit (hereinafter, ECU) electronically controls an
electric motor 2. Theelectric motor 2 is the power source of themotor air pump 1. The ECU also controls an actuator (not shown), which is the power source of the secondaryair control valve 14. The ECU controls theelectric motor 2 and the actuator based on the state of operation of the engine E. The ECU is provided with a microcomputer of publicly known structure. The ECU operates as a CPU that carries out control processing and computation processing, a storage device (i.e., memory such as ROM and RAM) that stores various programs and data, and the like. Furthermore, the ECU operates as a pump control unit. When the ignition switch is turned on (IG=ON), the ECU adjusts power supplied to theelectric motor 2 to control the rotational motion (e.g. rotational speed) of themotor air pump 1 based on a control program stored in memory. - When the engine is started, the ECU detects the exhaust gas temperature with the exhaust gas temperature sensor. When the detected exhaust gas temperature is equal to or lower than a predetermined value, the ECU drives and opens the secondary
air control valve 14. Since power is also supplied to themotor air pump 1 at this time, a secondary airflow is generated in the secondary air channels formed in the secondaryair channel pipes motor air pump 1. Apressure sensor 25 is installed in the secondaryair channel pipe 11, and when the secondary air pressure detected by thepressure sensor 25 is out of a predetermined pressure range, an anomaly is detected. - Brief description will be given to the construction of the
motor air pump 1 in this embodiment with reference toFIG. 2 toFIGS. 4A and 4B . Themotor air pump 1 is a double vane type vortex motor air pump. Themotor air pump 1 includes theelectric motor 2 operated with electric power, apump housing 4 coupled to themotor housing 3 of theelectric motor 2, anair duct 5 hermetically joined with thepump housing 4, afilter 6 provided in theair duct 5, a pump impeller 7 (i.e., air pump body) rotatably supported in thepump housing 4 and rotationally driven by theelectric motor 2, and the like. - In one embodiment, the
electric motor 2 is a direct-current (DC) motor. Thiselectric motor 2 includes a field (stator) 33 with multiplepermanent magnets 32 on the inner circumferential surface of acylindrical yoke 31. Themotor 2 also includes an armature (rotor) 34 provided on the inner circumferential surface of thefield 33. Themotor 2 further includes abrush assembly 37 withmultiple brushes 36 to be abutted against thecommutator 35 provided in thearmature 34 in themotor housing 3. It will be appreciated that themotor 2 could be of any suitable type, such as a brushless direct-current (DC) motor or an alternating-current (AC) motor, such as a three-phase induction motor. - The
armature 34 includes a motor shaft 41 (i.e., a rotating shaft or the output shaft of the electric motor 2). Themotor shaft 41 is rotatably supported in themotor housing 3. Thearmature 34 also includes anarmature core 42 secured on the outer circumferential surface of themotor shaft 41. Thearmature 34 further includes multiple armature coils (i.e., armature windings) wound on thearmature core 42. Thearmature 34 additionally includesmultiple commutators 35 connected in correspondence with the respective armature coils. Thebrush assembly 37 includesmultiple brushes 36 pressed against thecommutators 35 and multiplebrush holding members 44 that hold thebrushes 36 toward thecommutators 35 so that the brushes can slide. Thebrush assembly 37 further includesmultiple springs 45 that energize the individual brushes 36 toward thecommutators 35 and aspacer 46 that supports thebrush holding members 44 in themotor housing 3. - The
pump housing 4 includes afirst case 52 coupled to themotor housing 3 byscrews 51 and asecond case 54 coupled to thefirst case 52 byclips 53. An annular swirl chamber 57 (i.e., pump chamber) is provided in thepump housing 4 for compressing air due to rotation of theimpeller 7. Theair duct 5 is connected to thefirst case 52 for directing the air into theswirl chamber 57. First and second C-shapedside grooves 58, 59 are provided in the peripheral portion of theswirl chamber 57 in the radial direction and have respective bottom faces with semi-circular sectional shape. - The
filter 6 is provided in theair duct 5 for filtering the air sucked into theimpeller 7. Thefilter 6 catches foreign matter mixed in air to prevent the entry of the foreign matter into theswirl chamber 57. However, air flowing in through the open end (i.e., air inlet) of theair duct 5 can pass through thefilter 6. In the embodiment of themotor air pump 1 illustrated inFIG. 1 , a filter case 9 is hermetically connected to the upstream end of theair duct 5, and thefilter 6 is placed in the filter case 9. It will be appreciated that thefilter 6 need not be placed in theair duct 5. In thefirst case 52, there is formed apump suction opening 56 for sucking the air from theair channel 55 formed in theair duct 5 into theswirl chamber 57. In thesecond case 54, there is formed a pump discharge opening (not shown) for discharging air from theswirl chamber 57. Between the first andsecond cases pump suction opening 56 into the pump discharge opening. - The
impeller 7 is rotatably housed in theswirl chamber 57 of thepump housing 4. Theimpeller 7 is a double vane type vane wheel having a plurality of vane portions (i.e., blades, fins, etc.) and a plurality of vane grooves. Theimpeller 7 pressurizes the air sucked into theswirl chamber 57 and discharges the pressurized air. Theimpeller 7 has a disk-shaped rotor portion 61 (i.e., main body) secured on the outer circumferential surface of the axial end of themotor shaft 41 of theelectric motor 2 so that theimpeller 7 is unlikely to rotate relative to themotor shaft 41. On the outer radial portion of therotor portion 61, there are formed a plurality ofvane portions vane portions rotor portion 61. In one embodiment, thevane portions rotor portion 61. (The vane portions will be hereafter referred to as multiplefirst vane portions 62 and second vane portions 63).Vane grooves vane portions first vane grooves 64 andsecond vane grooves 65.) - The
first vane portions 62 and thefirst vane grooves 64 are provided on the upstream side of the secondary air flow (i.e., the right side inFIG. 2 ). Thefirst vane portions 62 andfirst vane grooves 64 curve radially away from therotor portion 61. As such, thefirst vane portions 62 and thefirst vane grooves 64 are concave and curved from an inner radius end to an outer radius end in the direction of the radius of therotor portion 61. Thefirst vane portions 62 and thefirst vane grooves 64 are curved toward the direction of rotation of the impeller 7 (i.e., toward the direction of the arrow inFIG. 3A and toward the direction of the arrow inFIG. 4A ). - On the other hand, the
second vane portions 63 and thesecond vane grooves 65 are provided on the downstream side of the secondary air flow (i.e., the left side inFIG. 2 ). As shown inFIG. 3 , thesecond vane portions 63 and thesecond vane grooves 65 curve radially away from therotor portion 61. As such, thesecond vane portions 63 and thesecond vane grooves 65 are concave and curved from an inner radius end to an outer radius end in the direction of the radius of therotor portion 61. Thesecond vane portions 63 and thesecond vane grooves 65 are curved toward the direction of rotation of the impeller 7 (i.e., toward the direction of the arrow inFIG. 3A and toward the direction of the arrow inFIG. 4A ). - As shown in
FIGS. 3B, 4A , and 4B, each of thefirst vane portions 62 include a respectivefirst end 70 and a respective second end 72 (i.e., axial end). Also, each of thesecond vane portions 63 includes a respectivefirst end 71 and a respective second end 73 (i.e., axial end). The first ends 70, 71 of the first andsecond vane portions impeller 7 in the direction of the rotational axis of theimpeller 7, and the second ends 72, 73 of the first andsecond vane portions impeller 7 in the 15 direction of the rotational axis of theimpeller 7. It will be appreciated that the second ends 72, 73 of the first andsecond vane portions impeller 7. It will also be appreciated that the first ends 70, 71 of the first andsecond vane portions impeller 7. - As shown in
FIGS. 3B, 4A , and 4B, an annular dividing wall 66 (i.e., rib) is included between the first andsecond vane portions annular dividing wall 66 extends radially away from therotor portion 61 and extends around the entire circumference of therotor portion 61. Theannular dividing wall 66 is provided approximately at the center of theimpeller 7 in the direction of the rotational axis of theimpeller 7. As shown inFIG. 2 , the dividingwall 66 is wider and concave at its base such that the bottom of the first andsecond vane grooves wall 66 are flush with the curved surfaces of the adjacent first andsecond side grooves 58, 59 of theswirl chamber 57. - As shown in
FIGS. 3B, 4A , and 4B, thefirst vane portions 62 are coupled to theannular dividing wall 66 at the respective first ends 70 thereof. Also, thesecond vane portions 63 are coupled to theannular dividing wall 66 at the respective first ends 71 thereof. - Furthermore, as shown in
FIGS. 3B, 4A , and 4B, at least one of the first andsecond vane portions impeller 7. In the embodiment shown, each of the first andsecond vane portions second vane portions FIG. 4A ). In other words, the second ends 72, 73 of thevane portions 62, 63 (i.e., the axial ends of thevane portions 62, 63) extend toward the direction of rotation of theimpeller 7. Stated differently, the first andsecond vane portions wall 66 such that the second ends 72, 73 of the first andsecond vane portions 62, 63 (i.e., the suction ends) are positioned ahead of the first ends 70, 71 thereof (i.e., the discharge ends) in the direction of rotation of theimpeller 7. - The angle of incline φ of the first and
second vane portions 62, 63 (i.e., the angle defined between the surface of the respective first orsecond vane portion FIG. 7 . Further, in one embodiment, the angle of incline φ is approximately 20°. - Vehicles, such as automobiles, are mounted with an exhaust gas purifier. Exhaust gas discharged from the combustion chambers of the engine E of a vehicle contains harmful components. The purifier changes elements (e.g., carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxides (NOx)) from harmful components into harmless components by chemical reaction (i.e., three way catalyst converter 13). For instance, the purifier changes hydrocarbon (HC) into harmless water (H2O) by oxidation. In the three-way catalyst, however, proper chemical reaction does not take place unless the ratio of mixture of air and fuel is equal to a theoretical air-fuel ratio when burning is carried out in the engine E. For instance, it may be required to maintain the theoretical air-fuel ration of 14.7:1. The three-way catalyst does not properly operate when the exhaust gas temperature is too low (approximately 350° C. or below for example), immediately after the engine E is started.
- For this reason, when the exhaust gas temperature is low immediately after the engine is started, electric power is supplied to the
electric motor 2 of themotor air pump 1. As a result, theimpeller 7 is rotationally driven by the rotational motion of themotor shaft 41 of theelectric motor 2 to produce secondary air in the secondaryair channel pipes impeller 7 of themotor air pump 1 is guided into the three way catalyst converter 13 by way of the secondaryair channel pipe 11, secondaryair control valve 14, secondaryair channel pipe 12, andengine exhaust pipe 15. Thus, warming of the three-way catalyst is facilitated to activate the three-way catalyst. Consequently, when the exhaust gas temperature is low, for example, immediately after the engine E is started, the ECU drives and opens the secondaryair control valve 14. (This operation is performed when the exhaust gas temperature detected with the exhaust gas temperature sensor is lower than a predetermined value, or when the temperature of the three-way catalyst detected with thecatalyst temperature sensor 24 is lower than a predetermined value.) At the same time, the ECU supplies electric power (pump driving current) to theelectric motor 2 of themotor air pump 1 to actuate themotor air pump 1. Thus, the pressure feed and supply of secondary air by themotor air pump 1 is started. - When the
impeller 7 is rotationally driven by the rotational motion of themotor shaft 41 of theelectric motor 2, the air in theswirl chamber 57 of thepump housing 4 is compressed by movement of the multiple first andsecond vane portions pump suction opening 56 of thepump housing 4, the air filtered through thefilter 6 is guided into thepump suction opening 56 by way of theair channel 55 in theair duct 5. Further, since high pressure is produced in the pump discharge opening of thepump housing 4, the air pressurized in theswirl chamber 57 is discharged from the pump discharge opening. - Therefore, the air discharged from the pump discharge opening of the
motor air pump 1 is fed into the three way catalyst converter 13 by way of the secondaryair channel pipe 11, secondaryair control valve 14, secondaryair channel pipe 12, andengine exhaust pipe 15. As a result, even when the exhaust gas temperature is low immediately after the engine is started, secondary air produced by actuating themotor air pump 1 is guided into the three way catalyst converter 13. Therefore, the three-way catalyst is activated, and the exhaust gas is purified. For instance, because the hydrocarbon (HC) is changed into water (H2O) by oxidation, the amount of hydrocarbon (HC) emitted into the air is reduced. - As mentioned above, the first and
second vane portions impeller 7. As such, the air inflow angle at which air flows in from the second ends 72 of thefirst vane portions 62 between thefirst vane portions 62 substantially agrees with the angle of incline φ of thefirst vane portions 62. Further, the air inflow angle at which air flows in from thesecond end 73 of thesecond vane portions 63 between thesecond vane portions 63 substantially agrees with the angle of incline φ of thesecond vane portions 63. As illustrated inFIG. 4B , air smoothly flows toward the first ends 70, 71 of the first andsecond vane portions second vane portions - For instance, in the
motor air pump 1 in this embodiment, the noise level (30-cm noise on the suction opening side) can be reduced by an amount equal to or larger than a predetermined value in all the audible frequency bands unlike the prior art pump, as indicated in the characteristic diagram inFIG. 5 . Also, for this embodiment of themotor air pump 1, the peak value (at 1.6 kHz) of the turbulence noise (i.e., noise level) in the vortex pump is reduced by 2 dB from the motor air pump of the prior art. - Modifications
- In the embodiment discussed above, the
motor air pump 1 is connected to the upstream end of the secondaryair channel pipes engine exhaust pipe 15. In another embodiment, themotor air pump 1 is connected at a midpoint in the secondaryair channel pipes motor air pump 1 is directly connected to the joint of the secondaryair channel pipe 12 and theengine exhaust pipe 15. In this case, theengine exhaust pipe 15 functions as air channel pipe, and the air channel functions as an exhaust passage. - Also, in the embodiment discussed above, the
impeller 7 is directly assembled to themotor shaft 41 of theelectric motor 2. In another embodiment, themotor shaft 41 of theelectric motor 2 and the rotating shaft of theimpeller 7 are separately constructed. Further, in one embodiment, a speed reducing mechanism that reduces the motor rotational speed to a predetermined reduction ratio is installed between themotor shaft 41 of theelectric motor 2 and the rotating shaft of theimpeller 7. - In the above example described in connection with this embodiment, the fluid pumping system of the invention is applied to the double vane type vortex
motor air pump 1. In another embodiment, the fluid pumping system of the invention is used in a single vane type vortex motor air pump. In the above embodiment, air, such as secondary air, is used as fluid. In another embodiment, gas, such as evaporated fuel or vapor-phase coolant, or liquid, such as water, fuel, oil, or liquid-phase coolant, is fluid that is pumped. - In this embodiment, all of the first and
second vane portions impeller 7. In another embodiment, less than all of the first andsecond vane portions second vane portions - Furthermore, in one embodiment represented in
FIG. 4C , the first andsecond vane portions vane portions 62, 63 (e.g., the portion adjacent the first ends 70, 71) extends approximately parallel to the axis of rotation of theimpeller 7, and a portion of thevane portions 62, 63 (e.g., the portion adjacent the second ends 72, 73) is swept forward toward the direction of rotation of theimpeller 7. Thus, the angle of incline is approximately 0° adjacent the first ends 70, 71. However, the second ends 72, 73 extend toward the direction of rotation of theimpeller 7. Thus, the angle of incline φ is provided only at the suction ends (i.e., the second ends 72, 73) of the first andsecond vane portions second vane portions second vane portions - While only the selected preferred embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made therein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing description of the preferred embodiments according to the present invention is provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005-283759 | 2005-09-29 | ||
JP2005283759A JP2007092659A (en) | 2005-09-29 | 2005-09-29 | Fluid pump device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070077138A1 true US20070077138A1 (en) | 2007-04-05 |
Family
ID=37887138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/529,543 Abandoned US20070077138A1 (en) | 2005-09-29 | 2006-09-29 | Fluid pumping system |
Country Status (3)
Country | Link |
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US (1) | US20070077138A1 (en) |
JP (1) | JP2007092659A (en) |
DE (1) | DE102006000489A1 (en) |
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CN104005987A (en) * | 2014-05-29 | 2014-08-27 | 江苏大学 | Design method for impeller and pumping chamber of high-lift peripheral pump |
US9249806B2 (en) | 2011-02-04 | 2016-02-02 | Ti Group Automotive Systems, L.L.C. | Impeller and fluid pump |
CN105626576A (en) * | 2016-01-07 | 2016-06-01 | 江苏大学 | Hydraulic design method for sea water desalination high-pressure booster pump |
US20170044959A1 (en) * | 2015-08-10 | 2017-02-16 | Andrew Brocker | Secondary air pump assembly |
CN107110169A (en) * | 2015-01-09 | 2017-08-29 | 皮尔伯格有限责任公司 | Wing passage air blower for the internal combustion engine with wide cutout gap |
CN107110168A (en) * | 2015-01-09 | 2017-08-29 | 皮尔伯格有限责任公司 | Wing passage air blower for internal combustion engine |
US20170298949A1 (en) * | 2016-04-13 | 2017-10-19 | Aisan Kogyo Kabushiki Kaisha | Vortex pump and fuel vapor treatment device comprising the vortex pump |
US20180347572A1 (en) * | 2015-11-24 | 2018-12-06 | Aisan Kogyo Kabushiki Kaisha | Vortex pump |
US10415511B2 (en) * | 2015-05-15 | 2019-09-17 | Aisan Kogyo Kabushiki Kaisha | Evaporated fuel processing devices |
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US10415511B2 (en) * | 2015-05-15 | 2019-09-17 | Aisan Kogyo Kabushiki Kaisha | Evaporated fuel processing devices |
US20170044959A1 (en) * | 2015-08-10 | 2017-02-16 | Andrew Brocker | Secondary air pump assembly |
US9810128B2 (en) * | 2015-08-10 | 2017-11-07 | Fca Us Llc | Secondary air pump assembly |
US20180347572A1 (en) * | 2015-11-24 | 2018-12-06 | Aisan Kogyo Kabushiki Kaisha | Vortex pump |
CN105626576A (en) * | 2016-01-07 | 2016-06-01 | 江苏大学 | Hydraulic design method for sea water desalination high-pressure booster pump |
US20170298949A1 (en) * | 2016-04-13 | 2017-10-19 | Aisan Kogyo Kabushiki Kaisha | Vortex pump and fuel vapor treatment device comprising the vortex pump |
US10041501B2 (en) * | 2016-04-13 | 2018-08-07 | Aisan Kogyo Kabushiki Kaisha | Vortex pump and fuel vapor treatment device comprising the vortex pump |
Also Published As
Publication number | Publication date |
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DE102006000489A1 (en) | 2007-04-12 |
JP2007092659A (en) | 2007-04-12 |
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