US20140072425A1 - Multi-channel fuel pump - Google Patents
Multi-channel fuel pump Download PDFInfo
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- US20140072425A1 US20140072425A1 US13/608,171 US201213608171A US2014072425A1 US 20140072425 A1 US20140072425 A1 US 20140072425A1 US 201213608171 A US201213608171 A US 201213608171A US 2014072425 A1 US2014072425 A1 US 2014072425A1
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- Prior art keywords
- flow channel
- plate flow
- inlet plate
- sectional area
- outlet
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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
- F04D5/00—Pumps with circumferential or transverse flow
- F04D5/002—Regenerative pumps
- F04D5/003—Regenerative pumps of multistage type
- F04D5/005—Regenerative pumps of multistage type the stages being radially offset
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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
- F04D5/00—Pumps with circumferential or transverse flow
- F04D5/002—Regenerative pumps
- F04D5/008—Details of the stator, e.g. channel shape
Definitions
- the present invention relates to a fluid pump; more particularly to a fuel pump; even more particularly to a multi-channel fuel pump; and still even more particularly to a multi-channel fuel pump in which the channels are synchronized.
- Fluid pumps and more particularly fuel pumps for pumping fuel, for example, from a fuel tank of a motor vehicle to an internal combustion engine of the motor vehicle, are known.
- U.S. Pat. No. 5,338,151 shows one type of fuel pump which includes an impeller with two arrays of blades that are concentric to each other such that one array of blades radially surrounds the other array of blades.
- An inlet plate is disposed adjacent to one face of the impeller and includes first and second inlet plate flow channels that are arranged in series to each other.
- One inlet plate flow channel is aligned with the first array of blades while the other inlet plate flow channel is aligned with the second array of blades, accordingly, one inlet plate flow channel is disposed radially outward of the other inlet plate flow channel.
- An outlet plate is disposed adjacent to the face of the impeller that is opposite the inlet plate.
- the outlet plate includes first and second outlet plate flow channels that are arranged in series to each other.
- One outlet plate flow channel is aligned with the first array of blades while the other outlet plate flow channel is aligned with the second array of blades, accordingly, one outlet plate flow channel is disposed radially outward of the other outlet plate flow channel.
- each inlet and outlet flow channel is affected by the radial distance of the flow channel from the center of rotation of the impeller, the cross-sectional area of the flow channel, and the rotational rate of impeller. Without consideration to the geometry of each of the flow channels relative to each other, the maximum pumping efficiency for each flow channel may occur at different rotational rates of the impeller which reduces the overall efficiency of the fuel pump.
- a fluid pump includes an outlet for discharging fluid from the fluid pump, a housing, and a motor with a shaft that rotates about an axis.
- the fluid pump also includes an impeller having a first array of blades radially surrounding the axis and a second array of blades radially surrounding the first array of blades.
- the impeller is rotatable by the shaft of the motor.
- the fluid pump also includes an inlet plate adjacent to the impeller and has an inlet for introducing fluid into the fluid pump, a first inlet plate flow channel aligned with the first array of blades and having a first inlet plate flow channel cross-sectional area, and a second inlet plate flow channel aligned with the second array of blades and having a second inlet plate flow channel cross-sectional area.
- Rotation of the impeller pumps fluid from the inlet to the outlet.
- the second inlet plate flow channel cross-sectional area is synchronized with the first inlet plate flow channel cross-sectional area.
- FIG. 1 is an axial cross-sectional view of a fuel pump in accordance with the present invention
- FIG. 2 is an enlarged axial cross-sectional view of a pump section of the fuel pump of FIG. 1 ;
- FIG. 3 is an axial view of an inlet plate of the pump section of FIG. 2 ;
- FIG. 4 is an axial view of an outlet plate of the pump section of FIG. 2 ;
- FIG. 5 is an isometric view of an impeller of the pump section of FIG. 2 ;
- FIG. 6 is graph showing the pumping efficiency of pumping channels of the fuel pump of FIG. 1 and the overall pumping efficiency of the fuel pump of FIG. 1 ;
- FIG. 7 is a graph showing the pumping efficiency of the pumping channels of a non-synchronized fuel pump and the overall pumping efficiency of the non-synchronized fuel pump.
- FIG. 1 is an axial cross-sectional view of a fluid pump illustrated as fuel pump 10 for pumping liquid fuel, for example gasoline or diesel fuel, from a fuel tank (not shown) to an internal combustion engine (not shown). While the fluid pump is illustrated as fuel pump 10 , it should be understood that the invention is not to be limited to a fuel pump, but could also be applied to fluid pumps for pumping fluids other than fuel.
- Fuel pump 10 generally includes a pump section 12 at one end, a motor section 14 adjacent to pump section 12 , and an outlet section 16 adjacent to motor section 14 at the end of fuel pump 10 opposite pump section 12 .
- a housing 18 of fuel pump 10 retains pump section 12 , motor section 14 and outlet section 16 together. Fuel enters fuel pump 10 at pump section 12 , a portion of which is rotated by motor section 14 as will be described in more detail later, and is pumped past motor section 14 to outlet section 16 where the fuel exits fuel pump 10 .
- Motor section 14 includes electric motor 20 which is disposed within housing 18 .
- Electric motor 20 includes a shaft 22 extending therefrom into pump section 12 .
- Shaft 22 rotates about axis 24 when an electric current is applied to electric motor 20 .
- Electric motors and their operation are well known, consequently, electric motor 20 will not be discussed further herein.
- pump section 12 includes an inlet plate 26 , an impeller 28 , an outlet plate 30 , and a spacer ring 32 .
- Inlet plate 26 is disposed at the end of pump section 12 that is distal from motor section 14 while outlet plate 30 is disposed at the end of pump section 12 that is proximal to motor section 14 .
- Both inlet plate 26 and outlet plate 30 are fixed relative to housing 18 to prevent relative movement between inlet plate 26 and outlet plate 30 with respect to housing 18 .
- Impeller 28 is disposed axially between inlet plate 26 and outlet plate 30 and is fixed to shaft 22 such that impeller 28 rotates with shaft 22 in a one-to-one relationship.
- Spacer ring 32 is also disposed axially between inlet plate 26 and outlet plate 30 , however, spacer ring 32 is fixed relative to housing 18 to prevent relative movement between housing 18 and spacer ring 32 .
- Spacer ring 32 is dimensioned to be slightly thicker, i.e. the dimension of spacer ring 32 in the direction of axis 24 is slightly greater than the dimension of impeller 28 in the direction of axis 24 . In this way, inlet plate 26 , outlet plate 30 , and spacer ring 32 are fixed within housing 18 , for example by crimping the end of housing 18 proximal to outlet plate 30 .
- Spacer ring 32 is also dimensioned to have an inside diameter that is larger than the outside diameter of impeller 28 to allow impeller 28 to rotate freely within spacer ring 32 and axially between inlet plate 26 and outlet plate 30 .
- Inlet plate 26 is generally planer and circular in shape, i.e. disk shaped, and includes an inlet 34 that extends through inlet plate 26 in the same direction as axis 24 .
- Inlet 34 is a passage which introduces fuel into fuel pump 10 .
- Inlet plate 26 also includes an inlet plate first flow channel 36 and an inlet plate second flow channel 38 that are both formed in the face of inlet plate 26 that faces toward impeller 28 .
- Inlet plate first flow channel 36 and inlet plate second flow channel 38 are joined together in series by inlet plate transition channel 40 .
- Inlet plate first flow channel 36 is defined by an inner wall 42 , an outer wall 44 , and a bottom 46 such that inner wall 42 is radially inward of outer wall 44 .
- Inlet plate first flow channel 36 has a width W IP1 and a depth D IP1 such that outer wall 44 has a radius R IP1 with a center at axis 24 .
- the ratio of width W IP1 to depth D IP1 is about 2.5:1.
- Inlet plate first flow channel 36 has a cross-sectional area A IP1 defined by a plane passing through and parallel to axis 24 as viewed in FIG. 2 .
- Inlet plate second flow channel 38 is defined by an inner wall 48 , an outer wall 50 , and a bottom 52 .
- Inlet plate second flow channel 38 has a width W IP2 and a depth D IP2 such that outer wall 50 has a radius R IP2 with a center at axis 24 such that inner wall 48 is radially inward of outer wall 50 .
- the ratio of width W IP2 to depth D IP2 is about 2.5:1.
- Inlet plate second flow channel 38 has a cross-sectional area A IP2 defined by a plane passing through and parallel to axis 24 as viewed in FIG. 2 .
- inlet plate second flow channel 38 is connected to inlet 34 while the other end of inlet plate second flow channel 38 is connected to one end of inlet plate first flow channel 36 via inlet plate transition channel 40 .
- Radius R IP2 and width W IP2 are sized such that inlet plate second flow channel 38 is radially outward of inlet plate first flow channel 36 to define an inlet plate separation surface 53 radially between outer wall 44 of inlet plate first flow channel 36 and inner wall 48 of inlet plate second flow channel 38 .
- Outlet plate 30 is generally planer and circular in shape, i.e. disk shaped, and includes an outlet plate outlet plate passage 54 that extends through outlet plate 30 in the same direction as axis 24 . Outlet plate outlet passage 54 is in fluid communication with outlet section 16 as will be describe in more detail later. Outlet plate 30 also includes an outlet plate first flow channel 56 and an outlet plate second flow channel 58 that are both formed in the face of outlet plate 30 that faces toward impeller 28 . Outlet plate first flow channel 56 and outlet plate second flow channel 58 are joined together in series by outlet plate transition channel 60 . Outlet plate first flow channel 56 is defined by an inner wall 62 , an outer wall 64 , and a bottom 66 such that inner wall 62 is radially inward of outer wall 64 .
- Outlet plate first flow channel 56 has a width W OP1 and a depth D OP1 such that outer wall 64 has a radius R OP1 with a center at axis 24 .
- the ratio of width W OP1 to depth D OP1 is about 2.5:1.
- Outlet plate first flow channel 56 has a cross-sectional area A OP1 defined by a plane passing through and parallel to axis 24 as viewed in FIG. 2 .
- One end of outlet plate first flow channel 56 is connected to outlet plate outlet passage 54 while the other end of outlet plate first flow channel 56 is connected to one end of outlet plate second flow channel 58 via outlet plate transition channel 60 .
- Outlet plate second flow channel 58 is defined by an inner wall 68 , an outer wall 70 , and a bottom 72 such that inner wall 68 is radially inward of outer wall 70 .
- Outlet plate second flow channel 58 has a width W OP2 and a depth D OP2 such that outer wall 70 has a radius R OP2 with a center at axis 24 .
- the ratio of width W OP2 to depth D OP2 is about 2.5:1.
- Outlet plate second flow channel 58 has a cross-sectional area A OP2 defined by a plane passing through and parallel to axis 24 as viewed in FIG. 2 .
- Radius R OP2 and width W OP2 are sized such that outlet plate second flow channel 58 is radially outward of outlet plate first flow channel 56 to define an outlet plate separation surface 73 radially between outer wall 64 of outlet plate first flow channel 56 and inner wall 68 of outlet plate second flow channel 58 .
- Impeller 28 includes a first plurality of blades 76 arranged in a polar array radially surrounding and centered about axis 24 such that blades 76 are aligned with inlet plate first flow channel 36 and outlet plate first flow channel 56 .
- Blades 76 are each separated from each other by a first blade chamber 78 that passes through impeller 28 in the general direction of axis 24 .
- Impeller 28 also includes a second plurality of blades 80 arranged in a polar array radially surrounding and centered about axis 24 and first array of blades 76 such that blades 80 are aligned with inlet plate second flow channel 38 and outlet plate second flow channel 58 .
- Blades 80 are each separated from each other by a second blade chamber 82 that passes through impeller 28 in the general direction of axis 24 .
- the first plurality of blades 76 are radially separated from the second plurality of blades 80 by a blade separation wall 84 that is located radially between the first plurality of blades 76 and the second plurality of blades 80 .
- Impeller 28 may be made, for example only, by a plastic injection molding process in which the preceding features of impeller 28 are integrally molded as a single piece of plastic.
- Outlet section 16 includes outlet 86 for discharging fuel from fuel pump 10 .
- Outlet 86 may be connected to, for example, a conduit (not shown) for supplying fuel to an internal combustion engine (not shown).
- Outlet 86 is in fluid communication with outlet plate outlet passage 54 of outlet plate 30 for receiving fuel that has been pumped by pump section 12 .
- inlet 34 is exposed to a volume of fuel (not shown) which is to be pumped to, for example, an internal combustion engine (not shown).
- An electric current is supplied to electric motor 20 in order to rotate shaft 22 and impeller 28 .
- impeller 28 rotates, fuel is drawn through inlet 34 into inlet plate first flow channel 36 , inlet plate second flow channel 38 , and inlet plate transition channel 40 .
- First blade chambers 78 and second blade chambers 82 allow fuel from inlet plate first flow channel 36 , inlet plate second flow channel 38 , and inlet plate transition channel 40 to flow to outlet plate first flow channel 56 , outlet plate second flow channel 58 , and outlet plate transition channel 60 .
- Impeller 28 subsequently discharges the fuel through outlet plate outlet passage 54 and consequently through outlet 86 .
- inlet plate first flow channel 36 is synchronized with inlet plate second flow channel 38 , i.e. area A IP1 is synchronized with area A IP2 , to provide maximum or near maximum pumping efficiency of inlet plate first flow channel 36 and inlet plate second flow channel 38 for a desired rate of rotation of impeller 28 .
- outlet plate first flow channel 56 is synchronized with outlet plate second flow channel 58 , i.e. area A OP1 is synchronized with area A OP2 , to provide maximum or near maximum efficiency of outlet plate first flow channel 56 and outlet plate second flow channel 58 at the desired rate of rotation of impeller 28 .
- the term “synchronized” signifies that the geometry of inlet plate first flow channel 36 and the geometry of inlet plate second flow channel 38 have been given consideration relative to each other in order to provide maximum or near maximum pumping efficiency at a common rotational rate of impeller 28 and that the geometry of outlet plate first flow channel 56 and the geometry of outlet plate second flow channel 58 have been given consideration relative to each other in order to provide maximum or near maximum pumping efficiency at a common rotational rate of impeller 28 .
- the synchronization will be described in further detail.
- fuel pump 10 is to have a maximum efficiency at a rotational rate of impeller 28 of ⁇ radians per second while delivering a volumetric flow rate Q m 3 /s at pressure P pascals.
- the total pressure P generated by the fuel pump 10 equals the sum of pressures generated by inlet plate first flow channel 36 and outlet plate first flow channel 56 , inlet plate second flow channel 38 , and outlet plate second flow channel 58 as indicated by the following equation:
- inlet plate first flow channel 36 and inlet plate second flow channel 38 and between outlet plate first flow channel 56 and outlet plate second flow channel 58 It may be desirable to minimize leakage between inlet plate first flow channel 36 and inlet plate second flow channel 38 and between outlet plate first flow channel 56 and outlet plate second flow channel 58 .
- a separation ⁇ for example about 0.006 m, is provided between inlet plate first flow channel 36 and inlet plate second flow channel 38 and between outlet plate first flow channel 56 and outlet plate second flow channel 58 such that ⁇ is equal to the radial dimension of inlet plate separation surface 53 plus W IP2 and also equal to the radial dimension of outlet plate separation surface 73 plus W OP2 . Consequently, inlet plate second flow channel 38 is related to inlet plate first flow channel 36 as shown by equation 4 below. Similarly, outlet plate second flow channel 58 is related to outlet plate first flow channel 56 as shown by equation 4.
- the cross section areas A IP1 , A IP2 , A OP1 , and A OP2 can be determined such that inlet plate first flow channel 36 and inlet plate second flow channel 38 are synchronized with each other and such that outlet plate first flow channel 56 and outlet plate second flow channel 58 are synchronized with each other.
- the pumping efficiency of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 are all substantially the same. Consequently, the overall pumping efficiency of fuel pump 10 is the same as each of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 .
- FIG. 6 is a plot of the pumping efficiency of each of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 as well as the overall pumping efficiency of fuel pump 10 .
- Trace 100 is shown which represents the pumping efficiency of each of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 as well as the overall pumping efficiency of fuel pump 10 .
- inlet plate first flow channel 36 is synchronized with inlet plate second flow channel 38 and outlet plate first flow channel 56 is synchronized with outlet plate second flow channel 58 , the pumping efficiency of each of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 , and consequently, the overall pumping efficiency of fuel pump 10 is represented by a single trace in FIG. 6 , that is, trace 100 .
- the maximum pumping efficiency of each of inlet plate first flow channel 36 , inlet plate second flow channel 38 , outlet plate first flow channel 56 , and outlet plate second flow channel 58 as well as the overall pumping efficiency of fuel pump 10 occurs at a rotational rate of about 5000 RPM of impeller 28 . Also as can be seen, the maximum pumping efficiency is about 50%.
- FIG. 7 represents the pumping efficiency of a fuel pump (not shown) with multiple flow channels that are not synchronized.
- FIG. 7 includes traces 102 , 104 , and 106 which correspond to the pumping efficiency of first flow channels in the inlet and outlet plates of the fuel pump, the pumping efficiency of second flow channels in the inlet and outlet plates of the fuel pump, and the overall pumping efficiency of the fuel pump respectively.
- the maximum pumping efficiency of the first flow channels in the inlet and outlet plates is about 50% which occurs at about 6000 RPM while the maximum pumping efficiency of the second flow channels in the inlet and outlet plates is also about 50%, but occurs at about 4000 RPM.
- FIGS. 6 and 7 are provided for example only and greater pumping efficiencies may be realized and that maximum pumping efficiency may be realized at rotational rates of the impeller that differ from that shown in FIGS. 6 and 7 .
- fuel pump 10 may have an impeller with a greater number of arrays of blades, such that in general, there are N arrays of blades where N ⁇ 2.
- the inlet plate and the outlet plate will each have flow channels that correspond to the number of arrays of blades in the impeller and that the flow channels of the inlet plate will be synchronized with each other and the flow channels of the outlet plate will be synchronized with each other.
- the flow channels are synchronized by determining the cross-sectional area of each pair of flow channels corresponding to one array of blades of the impeller, e.g.
- a n Q ⁇ ⁇ R n ⁇ ⁇ 0 , ⁇ n ⁇ ⁇ is ⁇ ⁇ an ⁇ ⁇ integeger ⁇ ⁇ from ⁇ ⁇ 1 ⁇ ⁇ to ⁇ ⁇ N equation ⁇ ⁇ 7
- N is the number of arrays of blades of the impeller, and consequently, the number of flow channels in each of the inlet plate and the outlet plate, i.e. the inlet plate has N flow channels and the outlet plate has N flow channels.
- Equations 1-4 can also be expressed generically in order to determine R n used in equation 7 above.
- the equations expressed generically are as follows:
- ⁇ 0 P n ⁇ ⁇ ⁇ 2 ⁇ R n 2 , ⁇ n ⁇ ⁇ is ⁇ ⁇ an ⁇ ⁇ integer ⁇ ⁇ from ⁇ ⁇ 1 ⁇ ⁇ to ⁇ ⁇ N equation ⁇ ⁇ 8
- P ⁇ ⁇ P n , ⁇ n ⁇ ⁇ is ⁇ ⁇ an ⁇ ⁇ integer ⁇ ⁇ from ⁇ ⁇ 1 ⁇ ⁇ to ⁇ ⁇ N equation ⁇ ⁇ 9
- R n + 1 R n + ⁇ , ⁇ n ⁇ ⁇ is ⁇ ⁇ an ⁇ ⁇ integer ⁇ ⁇ from ⁇ ⁇ 1 ⁇ ⁇ to ⁇ ⁇ N - 1 equation ⁇ ⁇ 10
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Abstract
A fluid pump includes an outlet for discharging fluid from the fluid pump, a housing, and a motor with a shaft that rotates about an axis. The fluid pump also includes an impeller having a first array of blades radially surrounding the axis and a second array of blades radially surrounding the first array of blades. The fluid pump also includes an inlet plate adjacent to the impeller and has an inlet for introducing fluid into the fluid pump, a first inlet plate flow channel aligned with the first array of blades and having a first inlet plate flow channel cross-sectional area, and a second inlet plate flow channel aligned with the second array of blades and having a second inlet plate flow channel cross-sectional area. The second inlet plate flow channel cross-sectional area is synchronized with the first inlet plate flow channel cross-sectional area.
Description
- The present invention relates to a fluid pump; more particularly to a fuel pump; even more particularly to a multi-channel fuel pump; and still even more particularly to a multi-channel fuel pump in which the channels are synchronized.
- Fluid pumps, and more particularly fuel pumps for pumping fuel, for example, from a fuel tank of a motor vehicle to an internal combustion engine of the motor vehicle, are known. U.S. Pat. No. 5,338,151 shows one type of fuel pump which includes an impeller with two arrays of blades that are concentric to each other such that one array of blades radially surrounds the other array of blades. An inlet plate is disposed adjacent to one face of the impeller and includes first and second inlet plate flow channels that are arranged in series to each other. One inlet plate flow channel is aligned with the first array of blades while the other inlet plate flow channel is aligned with the second array of blades, accordingly, one inlet plate flow channel is disposed radially outward of the other inlet plate flow channel. An outlet plate is disposed adjacent to the face of the impeller that is opposite the inlet plate. The outlet plate includes first and second outlet plate flow channels that are arranged in series to each other. One outlet plate flow channel is aligned with the first array of blades while the other outlet plate flow channel is aligned with the second array of blades, accordingly, one outlet plate flow channel is disposed radially outward of the other outlet plate flow channel. Rotation of the impeller by an electric motor pumps fuel from an inlet of the fuel pump, through one or more of the inlet and outlet plate flow channels, and subsequently to an outlet of the fuel pump. The pumping efficiency of each inlet and outlet flow channel is affected by the radial distance of the flow channel from the center of rotation of the impeller, the cross-sectional area of the flow channel, and the rotational rate of impeller. Without consideration to the geometry of each of the flow channels relative to each other, the maximum pumping efficiency for each flow channel may occur at different rotational rates of the impeller which reduces the overall efficiency of the fuel pump.
- What is needed is a fuel pump which minimizes or eliminates one or more of the shortcomings as set forth above.
- Briefly described, a fluid pump includes an outlet for discharging fluid from the fluid pump, a housing, and a motor with a shaft that rotates about an axis. The fluid pump also includes an impeller having a first array of blades radially surrounding the axis and a second array of blades radially surrounding the first array of blades. The impeller is rotatable by the shaft of the motor. The fluid pump also includes an inlet plate adjacent to the impeller and has an inlet for introducing fluid into the fluid pump, a first inlet plate flow channel aligned with the first array of blades and having a first inlet plate flow channel cross-sectional area, and a second inlet plate flow channel aligned with the second array of blades and having a second inlet plate flow channel cross-sectional area. Rotation of the impeller pumps fluid from the inlet to the outlet. The second inlet plate flow channel cross-sectional area is synchronized with the first inlet plate flow channel cross-sectional area.
- This invention will be further described with reference to the accompanying drawings in which:
-
FIG. 1 is an axial cross-sectional view of a fuel pump in accordance with the present invention; -
FIG. 2 is an enlarged axial cross-sectional view of a pump section of the fuel pump ofFIG. 1 ; -
FIG. 3 is an axial view of an inlet plate of the pump section ofFIG. 2 ; -
FIG. 4 is an axial view of an outlet plate of the pump section ofFIG. 2 ; -
FIG. 5 is an isometric view of an impeller of the pump section ofFIG. 2 ; -
FIG. 6 is graph showing the pumping efficiency of pumping channels of the fuel pump ofFIG. 1 and the overall pumping efficiency of the fuel pump ofFIG. 1 ; and -
FIG. 7 is a graph showing the pumping efficiency of the pumping channels of a non-synchronized fuel pump and the overall pumping efficiency of the non-synchronized fuel pump. - Reference will be made to
FIG. 1 which is an axial cross-sectional view of a fluid pump illustrated asfuel pump 10 for pumping liquid fuel, for example gasoline or diesel fuel, from a fuel tank (not shown) to an internal combustion engine (not shown). While the fluid pump is illustrated asfuel pump 10, it should be understood that the invention is not to be limited to a fuel pump, but could also be applied to fluid pumps for pumping fluids other than fuel.Fuel pump 10 generally includes apump section 12 at one end, amotor section 14 adjacent topump section 12, and anoutlet section 16 adjacent tomotor section 14 at the end offuel pump 10opposite pump section 12. Ahousing 18 offuel pump 10 retainspump section 12,motor section 14 andoutlet section 16 together. Fuel entersfuel pump 10 atpump section 12, a portion of which is rotated bymotor section 14 as will be described in more detail later, and is pumped pastmotor section 14 tooutlet section 16 where the fuel exitsfuel pump 10. -
Motor section 14 includeselectric motor 20 which is disposed withinhousing 18.Electric motor 20 includes ashaft 22 extending therefrom intopump section 12. Shaft 22 rotates aboutaxis 24 when an electric current is applied toelectric motor 20. Electric motors and their operation are well known, consequently,electric motor 20 will not be discussed further herein. - With continued reference to
FIG. 1 and with additional reference toFIGS. 2-5 ,pump section 12 includes aninlet plate 26, animpeller 28, anoutlet plate 30, and aspacer ring 32.Inlet plate 26 is disposed at the end ofpump section 12 that is distal frommotor section 14 whileoutlet plate 30 is disposed at the end ofpump section 12 that is proximal tomotor section 14. Bothinlet plate 26 andoutlet plate 30 are fixed relative tohousing 18 to prevent relative movement betweeninlet plate 26 andoutlet plate 30 with respect tohousing 18.Impeller 28 is disposed axially betweeninlet plate 26 andoutlet plate 30 and is fixed toshaft 22 such thatimpeller 28 rotates withshaft 22 in a one-to-one relationship.Spacer ring 32 is also disposed axially betweeninlet plate 26 andoutlet plate 30, however,spacer ring 32 is fixed relative tohousing 18 to prevent relative movement betweenhousing 18 andspacer ring 32.Spacer ring 32 is dimensioned to be slightly thicker, i.e. the dimension ofspacer ring 32 in the direction ofaxis 24 is slightly greater than the dimension ofimpeller 28 in the direction ofaxis 24. In this way,inlet plate 26,outlet plate 30, andspacer ring 32 are fixed withinhousing 18, for example by crimping the end ofhousing 18 proximal tooutlet plate 30. Axial forces created by the crimping process will be carried byspacer ring 32, thereby preventingimpeller 28 from being clamped tightly betweeninlet plate 26 andoutlet plate 30 which would preventimpeller 28 from rotating freely.Spacer ring 32 is also dimensioned to have an inside diameter that is larger than the outside diameter ofimpeller 28 to allowimpeller 28 to rotate freely withinspacer ring 32 and axially betweeninlet plate 26 andoutlet plate 30. -
Inlet plate 26 is generally planer and circular in shape, i.e. disk shaped, and includes aninlet 34 that extends throughinlet plate 26 in the same direction asaxis 24. Inlet 34 is a passage which introduces fuel intofuel pump 10.Inlet plate 26 also includes an inlet platefirst flow channel 36 and an inlet platesecond flow channel 38 that are both formed in the face ofinlet plate 26 that faces towardimpeller 28. Inlet platefirst flow channel 36 and inlet platesecond flow channel 38 are joined together in series by inletplate transition channel 40. Inlet platefirst flow channel 36 is defined by aninner wall 42, anouter wall 44, and abottom 46 such thatinner wall 42 is radially inward ofouter wall 44. Inlet platefirst flow channel 36 has a width WIP1 and a depth DIP1 such thatouter wall 44 has a radius RIP1 with a center ataxis 24. Preferably, the ratio of width WIP1 to depth DIP1 is about 2.5:1. Inlet platefirst flow channel 36 has a cross-sectional area AIP1 defined by a plane passing through and parallel toaxis 24 as viewed inFIG. 2 . - Inlet plate
second flow channel 38 is defined by aninner wall 48, anouter wall 50, and abottom 52. Inlet platesecond flow channel 38 has a width WIP2 and a depth DIP2 such thatouter wall 50 has a radius RIP2 with a center ataxis 24 such thatinner wall 48 is radially inward ofouter wall 50. Preferably, the ratio of width WIP2 to depth DIP2 is about 2.5:1. Inlet platesecond flow channel 38 has a cross-sectional area AIP2 defined by a plane passing through and parallel toaxis 24 as viewed inFIG. 2 . One end of inlet platesecond flow channel 38 is connected toinlet 34 while the other end of inlet platesecond flow channel 38 is connected to one end of inlet platefirst flow channel 36 via inletplate transition channel 40. Radius RIP2 and width WIP2 are sized such that inlet platesecond flow channel 38 is radially outward of inlet platefirst flow channel 36 to define an inletplate separation surface 53 radially betweenouter wall 44 of inlet platefirst flow channel 36 andinner wall 48 of inlet platesecond flow channel 38. -
Outlet plate 30 is generally planer and circular in shape, i.e. disk shaped, and includes an outlet plateoutlet plate passage 54 that extends throughoutlet plate 30 in the same direction asaxis 24. Outletplate outlet passage 54 is in fluid communication withoutlet section 16 as will be describe in more detail later.Outlet plate 30 also includes an outlet plate first flowchannel 56 and an outlet plate second flowchannel 58 that are both formed in the face ofoutlet plate 30 that faces towardimpeller 28. Outlet plate first flowchannel 56 and outlet plate second flowchannel 58 are joined together in series by outletplate transition channel 60. Outlet plate first flowchannel 56 is defined by aninner wall 62, anouter wall 64, and a bottom 66 such thatinner wall 62 is radially inward ofouter wall 64. Outlet plate first flowchannel 56 has a width WOP1 and a depth DOP1 such thatouter wall 64 has a radius ROP1 with a center ataxis 24. Preferably, the ratio of width WOP1 to depth DOP1 is about 2.5:1. Outlet plate first flowchannel 56 has a cross-sectional area AOP1 defined by a plane passing through and parallel toaxis 24 as viewed inFIG. 2 . One end of outlet plate first flowchannel 56 is connected to outletplate outlet passage 54 while the other end of outlet plate first flowchannel 56 is connected to one end of outlet plate second flowchannel 58 via outletplate transition channel 60. - Outlet plate second flow
channel 58 is defined by aninner wall 68, anouter wall 70, and a bottom 72 such thatinner wall 68 is radially inward ofouter wall 70. Outlet plate second flowchannel 58 has a width WOP2 and a depth DOP2 such thatouter wall 70 has a radius ROP2 with a center ataxis 24. Preferably, the ratio of width WOP2 to depth DOP2 is about 2.5:1. Outlet plate second flowchannel 58 has a cross-sectional area AOP2 defined by a plane passing through and parallel toaxis 24 as viewed inFIG. 2 . Radius ROP2 and width WOP2 are sized such that outlet plate second flowchannel 58 is radially outward of outlet plate first flowchannel 56 to define an outletplate separation surface 73 radially betweenouter wall 64 of outlet plate first flowchannel 56 andinner wall 68 of outlet plate second flowchannel 58. -
Impeller 28 includes a first plurality ofblades 76 arranged in a polar array radially surrounding and centered aboutaxis 24 such thatblades 76 are aligned with inlet plate first flowchannel 36 and outlet plate first flowchannel 56.Blades 76 are each separated from each other by afirst blade chamber 78 that passes throughimpeller 28 in the general direction ofaxis 24.Impeller 28 also includes a second plurality ofblades 80 arranged in a polar array radially surrounding and centered aboutaxis 24 and first array ofblades 76 such thatblades 80 are aligned with inlet plate second flowchannel 38 and outlet plate second flowchannel 58.Blades 80 are each separated from each other by asecond blade chamber 82 that passes throughimpeller 28 in the general direction ofaxis 24. The first plurality ofblades 76 are radially separated from the second plurality ofblades 80 by ablade separation wall 84 that is located radially between the first plurality ofblades 76 and the second plurality ofblades 80.Impeller 28 may be made, for example only, by a plastic injection molding process in which the preceding features ofimpeller 28 are integrally molded as a single piece of plastic. -
Outlet section 16 includesoutlet 86 for discharging fuel fromfuel pump 10.Outlet 86 may be connected to, for example, a conduit (not shown) for supplying fuel to an internal combustion engine (not shown).Outlet 86 is in fluid communication with outletplate outlet passage 54 ofoutlet plate 30 for receiving fuel that has been pumped bypump section 12. - In operation,
inlet 34 is exposed to a volume of fuel (not shown) which is to be pumped to, for example, an internal combustion engine (not shown). An electric current is supplied toelectric motor 20 in order to rotateshaft 22 andimpeller 28. Asimpeller 28 rotates, fuel is drawn throughinlet 34 into inlet plate first flowchannel 36, inlet plate second flowchannel 38, and inletplate transition channel 40.First blade chambers 78 andsecond blade chambers 82 allow fuel from inlet plate first flowchannel 36, inlet plate second flowchannel 38, and inletplate transition channel 40 to flow to outlet plate first flowchannel 56, outlet plate second flowchannel 58, and outletplate transition channel 60.Impeller 28 subsequently discharges the fuel through outletplate outlet passage 54 and consequently throughoutlet 86. - In order to improve the pumping efficiency of
fuel pump 10, inlet plate first flowchannel 36 is synchronized with inlet plate second flowchannel 38, i.e. area AIP1 is synchronized with area AIP2, to provide maximum or near maximum pumping efficiency of inlet plate first flowchannel 36 and inlet plate second flowchannel 38 for a desired rate of rotation ofimpeller 28. Similarly, outlet plate first flowchannel 56 is synchronized with outlet plate second flowchannel 58, i.e. area AOP1 is synchronized with area AOP2, to provide maximum or near maximum efficiency of outlet plate first flowchannel 56 and outlet plate second flowchannel 58 at the desired rate of rotation ofimpeller 28. As related to inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56 and outlet plate second flowchannel 58, the term “synchronized” signifies that the geometry of inlet plate first flowchannel 36 and the geometry of inlet plate second flowchannel 38 have been given consideration relative to each other in order to provide maximum or near maximum pumping efficiency at a common rotational rate ofimpeller 28 and that the geometry of outlet plate first flowchannel 56 and the geometry of outlet plate second flowchannel 58 have been given consideration relative to each other in order to provide maximum or near maximum pumping efficiency at a common rotational rate ofimpeller 28. In the paragraphs that follow, the synchronization will be described in further detail. - Let us assume that
fuel pump 10 is to have a maximum efficiency at a rotational rate ofimpeller 28 of ω radians per second while delivering a volumetric flow rate Q m3/s at pressure P pascals. The non-dimensional pressure ψ and non-dimensional flow φ follow the characteristic equation ψ=ƒ(φ) where ƒ is a known function. Maximum pumping efficiency offuel pump 10 occurs at φ=φ0≈0.7. At this point, ψ=ψ0=ƒ(φ0) where ψ may be obtained from empirical data. - In the following equations, let P1 be the pressure generated by inlet plate first flow
channel 36 and outlet plate first flowchannel 56, let P2 be the pressure generated by inlet plate second flowchannel 38 and outlet plate second flowchannel 58, let R1 be equal to RIP1 and ROP1, let R2 be equal to RIP2 and ROP2, and let ρ be the fluid density in kg/m3 of the fuel being pumped. -
- The total pressure P generated by the
fuel pump 10 equals the sum of pressures generated by inlet plate first flowchannel 36 and outlet plate first flowchannel 56, inlet plate second flowchannel 38, and outlet plate second flowchannel 58 as indicated by the following equation: -
P=P 1 +P 2 equation 3 - It may be desirable to minimize leakage between inlet plate first flow
channel 36 and inlet plate second flowchannel 38 and between outlet plate first flowchannel 56 and outlet plate second flowchannel 58. In order to minimize this leakage, a separation ε, for example about 0.006 m, is provided between inlet plate first flowchannel 36 and inlet plate second flowchannel 38 and between outlet plate first flowchannel 56 and outlet plate second flowchannel 58 such that ε is equal to the radial dimension of inletplate separation surface 53 plus WIP2 and also equal to the radial dimension of outletplate separation surface 73 plus WOP2. Consequently, inlet plate second flowchannel 38 is related to inlet plate first flowchannel 36 as shown by equation 4 below. Similarly, outlet plate second flowchannel 58 is related to outlet plate first flowchannel 56 as shown by equation 4. -
R 2 =R 1+ε equation 4 - The four equations; equation 1, equation 2, equation 3, and equation 4; can now be solved for the four unknowns: P1, P2, R1, R2. Having determined R1 and R2, the cross section areas AIP1, AIP2, AOP1, and AOP2 can be determined from the following equations where AIP1=AOP1, A1=AIP1+AOP1, AIP2=AOP2, and A2=AIP2+AOP2:
-
- By using equations 5 and 6, the cross section areas AIP1, AIP2, AOP1, and AOP2 can be determined such that inlet plate first flow
channel 36 and inlet plate second flowchannel 38 are synchronized with each other and such that outlet plate first flowchannel 56 and outlet plate second flowchannel 58 are synchronized with each other. In this way, the pumping efficiency of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58 are all substantially the same. Consequently, the overall pumping efficiency offuel pump 10 is the same as each of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58. This synchronization is illustrated inFIG. 6 which is a plot of the pumping efficiency of each of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58 as well as the overall pumping efficiency offuel pump 10.Trace 100 is shown which represents the pumping efficiency of each of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58 as well as the overall pumping efficiency offuel pump 10. Since inlet plate first flowchannel 36 is synchronized with inlet plate second flowchannel 38 and outlet plate first flowchannel 56 is synchronized with outlet plate second flowchannel 58, the pumping efficiency of each of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58, and consequently, the overall pumping efficiency offuel pump 10 is represented by a single trace inFIG. 6 , that is,trace 100. As can be seen, the maximum pumping efficiency of each of inlet plate first flowchannel 36, inlet plate second flowchannel 38, outlet plate first flowchannel 56, and outlet plate second flowchannel 58 as well as the overall pumping efficiency offuel pump 10 occurs at a rotational rate of about 5000 RPM ofimpeller 28. Also as can be seen, the maximum pumping efficiency is about 50%. - In contrast to
FIG. 6 which represents the pumping efficiency of afuel pump 10 havingmultiple flow channels FIG. 7 represents the pumping efficiency of a fuel pump (not shown) with multiple flow channels that are not synchronized.FIG. 7 includestraces FIGS. 6 and 7 are provided for example only and greater pumping efficiencies may be realized and that maximum pumping efficiency may be realized at rotational rates of the impeller that differ from that shown inFIGS. 6 and 7 . - While
fuel pump 10 has been shown havingimpeller 28 with first and second arrays ofblades fuel pump 10 may have an impeller with a greater number of arrays of blades, such that in general, there are N arrays of blades where N≧2. It should also be understood that the inlet plate and the outlet plate will each have flow channels that correspond to the number of arrays of blades in the impeller and that the flow channels of the inlet plate will be synchronized with each other and the flow channels of the outlet plate will be synchronized with each other. In this arrangement, the flow channels are synchronized by determining the cross-sectional area of each pair of flow channels corresponding to one array of blades of the impeller, e.g. the cross sectional area of the flow channels of the inlet and outlet plates corresponding to the first array of blades of the impeller, from the following equation which is similar to equations 5 and 6 above where n is the number representing the flow channel as counted from the inside moving radially outward: -
- In equation 7, N is the number of arrays of blades of the impeller, and consequently, the number of flow channels in each of the inlet plate and the outlet plate, i.e. the inlet plate has N flow channels and the outlet plate has N flow channels.
- Equations 1-4 can also be expressed generically in order to determine Rn used in equation 7 above. The equations expressed generically are as follows:
-
- While
fuel pump 10 has been described as having flow channels in bothinlet plate 26 andoutlet plate 30, it should now be understood that the equations set forth herein are equally applicable to fluid pumps that have multiple flow channels in only one plate. Consequently, in such a fluid pump having multiple flow channels in only one plate, An in equation 7 will determine the area of each nth flow channel in the plate having multiple flow channels. - While this invention has been described in terms of preferred embodiments thereof, it is not intended to be so limited.
Claims (21)
1. A fluid pump comprising:
an outlet for discharging fluid from said fluid pump;
a housing;
a motor with a shaft that rotates about an axis;
an impeller having a first array of blades radially surrounding said axis and a second array of blades radially surrounding said first array of blades, said impeller being rotatable by said shaft of said motor;
an inlet plate adjacent to said impeller and having an inlet for introducing fluid into said fluid pump, a first inlet plate flow channel aligned with said first array of blades and having a first inlet plate flow channel cross-sectional area, and a second inlet plate flow channel aligned with said second array of blades and having a second inlet plate flow channel cross-sectional area;
wherein rotation of said impeller pumps fluid from said inlet to said outlet; and
wherein said second inlet plate flow channel cross-sectional area is synchronized with said first inlet plate flow channel cross-sectional area.
2. A fluid pump as in claim 1 wherein said first inlet plate flow channel cross-sectional area and said second inlet plate flow channel cross-sectional area are synchronized according to the equation:
where Q is the volumetric flow rate of said fluid pump, ω is the rotational rate of said impeller, Rn is the radius of said first inlet plate flow channel or said second inlet plate flow channel where n signifies the number of the inlet plate flow channel, and φ0 is the non-dimensional flow of said fluid pump.
3. A fluid pump as in claim 2 wherein φ0 is about 0.7.
4. A fluid pump as in claim 2 wherein φ0 is the non-dimensional flow of said fluid pump at maximum efficiency.
5. A fluid pump as in claim 2 wherein Rn is determined from the equations:
where P is the total pressure generated by said fuel pump, P1 is the pressure generated by said first inlet plate flow channel, P2 is the pressure generated by said second inlet plate second flow channel, and ε is the radial separation between R1 and R2.
6. A fluid pump as in claim 1 wherein an inlet plate transition channel fluidly connects said first inlet plate flow channel with said second inlet plate flow channel.
7. A fluid pump as in claim 6 wherein said inlet plate transition channel fluidly connects said first inlet plate flow channel with said second inlet plate flow channel in series.
8. A fluid pump as in claim 1 further comprising:
an outlet plate adjacent to said impeller on the side said impeller that is opposite said inlet plate, said outlet plate having an outlet passage in fluid communication with said outlet; a first outlet plate flow channel aligned with said first array of blades and having a first outlet plate flow channel cross-sectional area; and a second outlet plate flow channel aligned with said second array of blades and having a second outlet plate flow channel cross-sectional area;
wherein said second outlet plate flow channel cross-sectional area is synchronized with said first outlet plate flow channel cross-sectional area.
9. A fluid pump as in claim 8 wherein the combined cross-sectional area of said first inlet plate flow channel cross-sectional area and said first outlet plate flow channel cross-section area and the combined cross-sectional area of said second inlet plate flow channel cross-sectional area and said second outlet plate flow channel cross-sectional area are synchronized.
10. A fluid pump as in claim 9 wherein the combined cross-sectional area of said first inlet plate flow channel cross-sectional area and said first outlet plate flow channel cross-section area and the combined cross-sectional area of said second inlet plate flow channel cross-sectional area and said second outlet plate flow channel cross-sectional area are synchronized according to the equation:
where Q is the volumetric flow rate of said fluid pump, ω is the rotational rate of said impeller, Rn is the radius of said first inlet plate flow channel and said first outlet plate flow channel or said second inlet plate flow channel and said second outlet plate flow channel where n signifies the number of the outlet plate flow channel, and φ0 is the non-dimensional flow of said fluid pump.
11. A fluid pump as in claim 10 wherein Rn is determined from the equations:
where P is the total pressure generated by said fuel pump, P1 is the pressure generated by said first inlet plate flow channel together with said first outlet plate flow channel, P2 is the pressure generated by said second inlet plate flow channel together with said second outlet plate flow channel, and ε is the radial separation between R1 and R2.
12. A fluid pump as in claim 8 wherein the ratio of the width to the depth of first inlet plate flow channel is about 2.5:1, the ratio of the width to the depth of second inlet plate flow channel is about 2.5:1, the ratio of the width to the depth of first outlet plate flow channel is about 2.5:1, and the ratio of the width to the depth of second outlet plate flow channel is about 2.5:1.
13. A fluid pump comprising:
an outlet for discharging fluid from said fluid pump;
a housing;
a motor with a shaft that rotates about an axis;
an impeller having N arrays of blades such that N≧2 wherein each array of blades radially surrounds said axis, and wherein each one of said arrays of blades are spaced radially from every other of said arrays of blades, said impeller being rotatable by said shaft of said motor;
an inlet plate adjacent to said impeller and having an inlet for introducing fluid into said fluid pump, a plurality of inlet plate flow channels such that each one of said plurality of inlet plate flow channels is aligned with one of said arrays of blades and such that each of said arrays of blades are aligned with one of said inlet plate flow channels, wherein each of said inlet plate flow channels has a corresponding inlet plate flow channel cross-sectional area;
wherein rotation of said impeller pumps fluid from said inlet to said outlet; and
wherein said inlet plate flow channel cross-sectional area of each of said inlet plate flow channels is synchronized with said inlet plate flow channel cross-sectional area of every other of said inlet plate flow channels.
14. A fluid pump as in claim 13 wherein said first inlet plate flow channel cross-sectional area and said second inlet plate flow channel cross-sectional area are synchronized according to the equation:
n is an integer from 1 to N
where Q is the volumetric flow rate of said fluid pump, ω is the rotational rate of said impeller, Rn is the radius of the nth inlet plate flow channel, and φ0 is the non-dimensional flow of said fluid pump.
15. A fluid pump as in claim 14 wherein φ0 is about 0.7.
16. A fluid pump as in claim 14 wherein φ0 is the non-dimensional flow of said fluid pump at maximum efficiency.
17. A fluid pump as in claim 14 wherein Rn is determined from the equations:
n is an integer from 1 to N
P=ΣP n , n is an integer from 1 to N
R n+1 =R n +ε, n is an integer from 1 to N−1
P=ΣP n , n is an integer from 1 to N
R n+1 =R n +ε, n is an integer from 1 to N−1
where P is the total pressure generated by said fuel pump, Pn is the pressure generated by the nth flow channel, and ε is the radial separation between adjacent said inlet plate flow channels.
18. A fluid pump as in claim 13 further comprising:
an outlet plate adjacent to said impeller on the side said impeller that is opposite said inlet plate, said outlet plate having an outlet passage in fluid communication with said outlet; a plurality of outlet plate flow channels such that each one of said plurality of outlet plate flow channels is aligned with one of said arrays of blades and such that each of said arrays of blades are aligned with one of said outlet plate flow channels, wherein each of said outlet plate flow channels has a corresponding outlet plate flow channel cross-sectional area;
wherein said outlet plate flow channel cross-sectional area of each of said outlet plate flow channels is synchronized with said outlet plate flow channel cross-sectional area of every other of said outlet plate flow channels.
19. A fluid pump as in claim 18 wherein the combined cross-sectional area of each nth inlet plate flow channel cross-sectional area and each corresponding nth outlet plate flow channel cross-section area and the combined cross-sectional area of every other nth inlet plate flow channel cross-sectional area and every other corresponding nth outlet plate flow channel cross-sectional area are synchronized.
20. A fluid pump as in claim 19 wherein the combined cross-sectional area of each nth inlet plate flow channel cross-sectional area and each corresponding nth outlet plate flow channel cross-section area and the combined cross-sectional area of every other nth inlet plate flow channel cross-sectional area and every other corresponding nth outlet plate flow channel cross-sectional area are synchronized according to the equation:
n is an integer from 1 to N
where Q is the volumetric flow rate of said fluid pump, ω is the rotational rate of said impeller, Rn is the radius of the nth inlet plate flow channel and nth outlet plate flow channel, and φ0 is the non-dimensional flow of said fluid pump.
21. A fluid pump as in claim 20 wherein Rn is determined from the equations:
n is an integer from 1 to N
P=ΣP n , n is an integer from 1 to N
R n+1 =R n +ε, n is an integer from 1 to N−1
P=ΣP n , n is an integer from 1 to N
R n+1 =R n +ε, n is an integer from 1 to N−1
where P is the total pressure generated by said fuel pump, Pn is the pressure generated by the nth flow channel, and ε is the radial separation between adjacent said inlet plate flow channels or between adjacent said outlet plate flow channels.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/608,171 US20140072425A1 (en) | 2012-09-10 | 2012-09-10 | Multi-channel fuel pump |
PCT/US2013/043117 WO2014039121A1 (en) | 2012-09-10 | 2013-05-29 | Multi-channel fuel pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US13/608,171 US20140072425A1 (en) | 2012-09-10 | 2012-09-10 | Multi-channel fuel pump |
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US20140072425A1 true US20140072425A1 (en) | 2014-03-13 |
Family
ID=50233453
Family Applications (1)
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US13/608,171 Abandoned US20140072425A1 (en) | 2012-09-10 | 2012-09-10 | Multi-channel fuel pump |
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US (1) | US20140072425A1 (en) |
WO (1) | WO2014039121A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017524969A (en) * | 2014-06-30 | 2017-08-31 | アマゾン テクノロジーズ インコーポレイテッド | Manufacturing method of electrowetting device |
GB2594145A (en) * | 2020-03-04 | 2021-10-20 | Eaton Intelligent Power Ltd | Single wheel multi-stage radially-layered regenerative pump |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3427112A1 (en) * | 1984-07-23 | 1986-01-23 | Friedrich 8541 Röttenbach Schweinfurter | SIDE CHANNEL PUMP WITH FORCE COMPENSATION |
ES2179152T3 (en) * | 1995-03-31 | 2003-01-16 | Bitron Spa | PERIPHERAL FUEL PUMP FOR AUTOMOBILE VEHICLES. |
-
2012
- 2012-09-10 US US13/608,171 patent/US20140072425A1/en not_active Abandoned
-
2013
- 2013-05-29 WO PCT/US2013/043117 patent/WO2014039121A1/en active Application Filing
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017524969A (en) * | 2014-06-30 | 2017-08-31 | アマゾン テクノロジーズ インコーポレイテッド | Manufacturing method of electrowetting device |
GB2594145A (en) * | 2020-03-04 | 2021-10-20 | Eaton Intelligent Power Ltd | Single wheel multi-stage radially-layered regenerative pump |
US11821429B2 (en) | 2020-03-04 | 2023-11-21 | Eaton Intelligent Power Limited | Single wheel multi-stage radially-layered regenerative pump |
GB2594145B (en) * | 2020-03-04 | 2024-07-31 | Eaton Intelligent Power Ltd | Single wheel multi-stage radially-layered regenerative pump |
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