US20070122264A1 - Pump - Google Patents

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Publication number
US20070122264A1
US20070122264A1 US11/604,770 US60477006A US2007122264A1 US 20070122264 A1 US20070122264 A1 US 20070122264A1 US 60477006 A US60477006 A US 60477006A US 2007122264 A1 US2007122264 A1 US 2007122264A1
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US
United States
Prior art keywords
impeller
casing
depression
shaped grooves
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/604,770
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English (en)
Inventor
Makoto Nakagawa
Mamoru Matsubara
Nobuhiro Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisan Industry Co Ltd
Original Assignee
Aisan Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2005341956A external-priority patent/JP2007146751A/ja
Priority claimed from JP2006002734A external-priority patent/JP2007182851A/ja
Priority claimed from JP2006126268A external-priority patent/JP2007297970A/ja
Application filed by Aisan Industry Co Ltd filed Critical Aisan Industry Co Ltd
Assigned to AISAN KOGYO KABUSHIKI KAISHA reassignment AISAN KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, NOBUHIRO, MATSUBARA, MAMORU, NAKAGAWA, MAKOTO
Publication of US20070122264A1 publication Critical patent/US20070122264A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
    • 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

Definitions

  • the present invention relates to a pump for drawing in a fluid such as fuel etc., increasing pressure thereof, and discharging the pressurized fuel.
  • This type of pump normally includes a substantially disk-shaped impeller and a casing that houses the impeller so that the impeller can rotate.
  • a group of concavities is formed on both the front and reverse surfaces of the impeller. Concavities forming each group are repeated in the circumferential direction. Circular arc-shaped grooves extending from an upstream end to a downstream end are formed in the two casing internal surfaces in the area in opposition to the groups of concavities on the impeller.
  • the pump flow path is formed by the. groups of concavities on the impeller and the circular arc-shaped grooves on the casing.
  • An intake hole is formed in the casing. The intake hole links the upstream end of the pump flow path with the outside of the casing.
  • An discharge hole is formed in the casing.
  • the discharge hole links the downstream end of the pump flow path with the outside of the casing.
  • the pressure acting on the front and reverse surfaces of the impeller tends to be non-uniform.
  • the difference in pressure acting on the front and reverse surfaces of the impeller tends to be non-uniform according to position in the circumferential direction.
  • fluid is drawn into the pump flow path within the casing from the intake hole, is pressurized within the pump flow path, and is expelled from the discharge hole.
  • fuel is drawn in from one surface of the impeller, but fuel is not drawn in from the other surface.
  • fuel is expelled from one surface of the impeller, but fuel is not expelled from the other surface of the impeller.
  • depression-shaped grooves in a U-shape are formed in both the front and reverse surfaces of the impeller.
  • the impeller rotates, fluid flows into these depression-shaped grooves.
  • a component of velocity in the axial direction of the impeller is produced. Therefore, the fluid that is discharged from the depression-shaped grooves presses the casing internal surface in the axial direction. In this way, a force is generated that acts in the direction to increase the clearance between the impeller and the casing internal surface, contact between the impeller and the casing is prevented, and the pump efficiency is improved.
  • it is difficult to prevent inclination of the impeller by simply forming depression-shaped grooves in the impeller, and it was not possible to prevent sufficiently contact between the impeller and the casing.
  • an object of the present teachings to provide a pump capable of effectively suppressing contact between the impeller and the casing.
  • a pump may comprise a casing, and a substantially disk-shaped impeller that rotates within the casing.
  • a group of concavities may be formed on both front and reverse surfaces of the impeller. Concavities forming each group may be repeated in a circumferential direction of the impeller.
  • a first groove may be formed on a first casing internal surface in opposition to the front surface of the impeller. The first groove may extend from an upstream end to a downstream end in an area facing one of the groups of concavities of the impeller.
  • a second groove may be formed on a second casing internal surface in opposition to the reverse surface of the impeller.
  • the second groove may extend from an upstream end to a downstream end in an area facing the other of the groups of concavities of the impeller.
  • An intake hole and a discharge hole may be formed in the casing.
  • the intake hole may link the upstream end of one of the first groove and the second groove with the outside of the casing, and the discharge hole may link the downstream end of the other of the first groove and the second groove with the outside of the casing. Therefore, when the impeller rotates, fluid is drawn into the casing from the intake hole. The fluid drawn into the casing is pressurized by the impeller, and is expelled outside the casing from the discharge hole.
  • a group of depression-shaped grooves may be formed in at least the first and second casing internal surfaces.
  • Each of depression-shaped grooves may extend from the center towards the outer periphery while shifting in the direction of rotation of the impeller.
  • the group of depression-shaped grooves may be asymmetrically formed with respect to the axis of rotation of the impeller in accordance with the position of the first and second grooves.
  • the fluid that is propelled from the center towards the outer periphery within the group of depression-shaped grooves presses on the surface of the casing in opposition to the impeller, and generates an effective lift force (i.e., a force acting in the direction to increase the clearance between the impeller and the casing internal surface) on the impeller.
  • the groups of depression-shaped grooves are formed asymmetrically in accordance with the position of the first groove and the second groove formed on the casing internal surfaces.
  • the group of depression-shaped grooves asymmetrically, it is possible to vary the magnitude of the lift force generated on the impeller according to the area on the impeller.
  • the group of depression-shaped grooves asymmetrically according to the position of the first groove and the second groove, it is possible to increase the lift force generated on the impeller in the areas where the pressure difference is large, and to decrease the lift force generated on the impeller in the areas where the pressure difference is small. In this way, it is possible to eliminate the non-uniformity in the pressure difference between the front and reverse surfaces of the impeller. In this way, it is possible to suppress the inclination of the impeller with respect to the axis of the impeller, and suppress contact between the impeller and the casing.
  • Forming the groups of depression-shaped grooves asymmetrically may be achieved, for example, by forming areas where the adjacent grooves are closely spaced and areas where the grooves are more widely spaced, or forming areas where the length of grooves is long and areas where the length of grooves is short, or forming areas where the depth of grooves is deep and areas where the depth of grooves is shallow, or forming areas where the width of grooves is wide and areas where the width of grooves is narrow, or forming areas where there are grooves and areas where there are none.
  • the lift forces generated on the impeller by the group of depression-shaped grooves are greater than in other areas.
  • the group of depression-shaped grooves that generates lift forces on the impeller may be formed in the area near the discharge hole and/or the area near the intake hole only. According to this configuration, lift forces act only on the impeller in the area near the discharge hole and/or in the area near the intake hole, so it is possible to effectively cancel out the pressure difference that varies with the area.
  • each depression-shaped groove comprising the group of depression-shaped grooves extends from the center of the impeller towards the outer periphery in a spiral shape.
  • depression-shaped grooves may be formed so that fluid in the clearance between the impeller and the casing is pressurized and a force is generated in the direction that increases the clearance between the impeller and the casing when the impeller rotates. Also, the clearance between the surface on which the depression-shaped grooves are formed and the surface in opposition thereto when the impeller is not inclined with respect to the casing may increase from the center of the impeller towards the outer periphery of the impeller.
  • one surface from among the surface in which the depression-shaped grooves is formed and the surface in opposition thereto is formed as a flat plane, and the other surface is formed in a tapered shape so that the clearance with the impeller increases from the center of the impeller towards the outer periphery of the impeller.
  • one surface from among the surface in which the depression shaped grooves are formed and the surface that is in opposition to this surface is formed as a flat plane, so processing of this plane is simple.
  • the depression-shaped grooves extend from the center of the impeller towards the outer periphery in a spiral shape. Also, the depression-shaped grooves may be formed on the impeller or on the casing.
  • an intake hole and a discharge hole may be formed in the casing.
  • the intake hole links the upstream end of a pump flow path formed by the groups of concavities, the first groove, and the second groove with the outside of the casing.
  • the discharge hole links the downstream end of the pump flow path with the outside of the casing.
  • Depression-shaped grooves sealed from the pump flow path may be formed on at least one surface from among the intake hole side impeller surface and the intake hole side casing internal surface, and depression-shaped grooves sealed from the pump flow path may be formed in neither the discharge hole side impeller surface nor the discharge hole side casing internal surface.
  • the force due to the pressure difference of the fluid in the pump flow path acts in a direction to press the impeller towards the intake hole side casing internal surface.
  • the fluid drawn into the pump flow path is pressurized as it flows from the upstream side (i.e., intake hole side) of the pump flow path to the downstream side (i.e., discharge hole side). Therefore, the fluid in the pump flow path is at a higher pressure in the discharge hole side than the intake hole side Therefore, the surface of the discharge hole side of the impeller is subjected to a higher pressure than the surface of the intake hole side, so the impeller is subject to a force in the direction of the intake hole side casing internal surface.
  • depression-shaped grooves are not formed on the discharge hole side of the impeller surface or the discharge hole side of the casing internal surface. Therefore, a lift force is not generated on the discharge hole side impeller surface; a lift force is only generated on the intake hole side impeller surface.
  • the lift force acting on the intake hole side impeller surface acts in a direction to cancel out the force (i.e., force acting in the direction to press the impeller towards the intake hole side casing internal surface) generated by the difference in pressure of the fluid in the casing. In this way, pressing the impeller towards and contact with the intake hole side casing internal surface, is suppressed.
  • a projecting portion is formed in the discharge hole side casing internal surface forming a loop in the circumferential direction of the impeller. If a projecting portion is formed in the discharge hole side casing internal surface, even if there is contact between the discharge hole side casing internal surface and the impeller, the discharge hole side casing internal surface and the impeller only contact locally. Therefore, it is possible to reduce the friction losses when the impeller and casing contact.
  • the projecting portion is positioned to the inside of the pump flow path.
  • this pump may further include a motor chamber provided on the outside of the casing and a motor housed within the motor housing.
  • the motor may have a shaft that rotates.
  • the discharge hole links the pump flow path and the motor chamber and a through hole that is penetrated by the motor shaft are formed in the casing, and one end of the motor shaft is fitted to the impeller.
  • the impeller is subject to a force in the direction of the intake bole side casing internal surface as a result of high pressure fluid that flows backwards from the motor chamber into the casing via the gap between the shaft and the through hole.
  • contact between the impeller and the discharge hole side casing internal surface is suppressed.
  • the lift force generated by the depression-shaped grooves acts in the direction to cancel out that force, so contact between the impeller and the intake hole side casing internal surface is suppressed.
  • an intake hole and a discharge hole may be formed in the casing.
  • the intake hole may link the upstream end of a pump flow path formed by the groups of concavities, the first groove, and the second groove with the outside of the casing.
  • the discharge hole may link the downstream end of the pump flow path with the outside of the casing.
  • Intake hole side depression-shaped grooves may be formed on at least one surface from among the intake hole side impeller surface and the intake hole side casing internal surface so that when the impeller rotates fluid is pressurized and a lift force is generated that acts in the direction to increase the clearance between the intake hole side impeller surface and the intake hole side casing internal surface.
  • Discharge hole side depression-shaped grooves may be formed on at least one surface from among the discharge hole side impeller surface and the discharge hole side casing internal surface so that when the impeller rotates fluid is pressurized and a lift force is generated that acts in the direction to increase the clearance between the discharge hole side impeller surface and the discharge hole side casing internal surface.
  • the number and/or shape of the discharge hole side depression-shaped grooves are preferably determined so that the lift force generated is smaller than the lift force generated by the intake hole side depression-shaped grooves, in accordance with the number and/or shape of the intake hole side depression-shaped grooves.
  • FIG. 1 is a vertical section through a pump according to a first representative embodiment of the present teachings.
  • FIG. 2 is a section through the line II-II in FIG. 1 .
  • FIG. 3 is a section on the line III-III in FIG. 1 .
  • FIG. 4 is a view corresponding to the section through the line II-II in FIG. 1 for a pump according to a second representative embodiment of the present teachings.
  • FIG. 5 is a view corresponding to the section through the line III-III in FIG. 1 for a pump according to a second representative embodiment of the present teachings.
  • FIG. 6 is a diagram to explain an example of the depression-shaped grooves formed on the pump casing.
  • FIG. 7 is a diagram to explain another example of the depression-shaped grooves formed on the pump casing.
  • FIG. 8 is a section on the line VIII-VIII in FIG. 7 .
  • FIG. 9 is a section on the line IX-IX in FIG. 7 .
  • FIG. 10 is a vertical section through a pump according to a third representative embodiment of the present teachings.
  • FIG. 11 is a plan (of the discharge hole side surface) of the impeller of the pump shown in FIG. 10 .
  • FIG. 12 is a view to explain the shape of the grooves formed in the discharge hole side surface of the impeller shown in FIG. 11 .
  • FIG. 13 is a section showing an enlargement of the pump according to the third representative embodiment.
  • FIG. 14 is a vertical section through a pump according to a fourth representative embodiment of the present teachings.
  • FIG. 15 is a plan view of the impeller of the fourth representative embodiment viewed from the bottom.
  • FIG. 16 is a diagram to explain the shape of the grooves formed in the bottom surface of the impeller shown in FIG. 15 .
  • FIG. 17 is a section showing an enlargement of the pump according to the fourth representative embodiment of the present teachings.
  • FIG. 18 is a section showing an enlargement of the Dump according to a fifth representative embodiment of the present teachings.
  • FIG. 19 is a plan of the impeller according to the fifth representative embodiment viewed from the bottom.
  • FIG. 20 is a plan showing another example of the depression-shaped grooves formed in the top surface of the impeller.
  • FIG. 21 is a plan showing another example of the depression-shaped grooves formed in the top surface of the impeller.
  • FIG. 22 is a plan showing another example of the depression-shaped grooves formed in the top surface of the impeller.
  • FIG. 23 shows the schematic relationship between the direction of the depression-shaped grooves and the direction of flow of the fuel within the clearance.
  • a Wesco pump 10 according to a first representative embodiment of the present teachings is explained with reference to the drawings.
  • the Wesco pump 10 may be used as fuel pump for an automobile.
  • the Wesco pump 10 may be utilized within a fuel tank, being utilized for supplying fuel to an engine of the automobile.
  • the Wesco pump 10 includes a motor unit 12 and a pump unit 14 .
  • the motor unit 12 has a rotor 18 .
  • the rotor 18 includes a shaft 20 , a laminated iron core 22 fixed to the shaft 20 , a coil (not shown in the drawings) wound around the laminated iron core 22 , and a commutator 24 connected to the ends of the coil.
  • the shaft 20 is rotatably supported by a housing 16 via bearings 26 , 28 .
  • a permanent magnet 30 is fixed to the inside of the housing 16 so as to surround the rotor 18 .
  • Terminals which are not shown on the drawings are provided on a top cover 32 attached to the top of the housing 16 , to supply electricity to the motor unit 12 .
  • the coil is activated via a brush 34 and the commutator 24 , to rotate the rotor 18 and shaft 20 .
  • the lower part of the housing 16 houses the pump unit 14 .
  • the pump unit 14 includes a substantially disk-shaped impeller 36 .
  • a group of concavities 3 a is formed along the outer periphery.
  • a group of concavities 3 b is formed along the outer periphery.
  • a through hole is formed in the center of the impeller 36 , connected to the shaft 20 so as to prevent relative rotation.
  • a pump casing 39 that houses the impeller 36 includes a pump cover 38 and a pump body 40 .
  • a groove 38 a is formed in the pump cover 38 in the area in opposition to the group of concavities 36 a .
  • the groove 38 a is formed in an approximately C-shape stretching from the upstream end to the downstream end along the direction of rotation of the impeller 36 .
  • An discharge hole 50 is formed in the pump cover 38 from the downstream end of the groove 38 a to the top surface of the pump cover 38 .
  • the discharge hole 50 links the interior of the pump casing 39 with the exterior (i.e., the internal space of the motor unit 12 ).
  • a first pump flow path 44 is formed by the group of concavities 36 a and the groove 38 a .
  • a group of depression-shaped grooves 38 b , 38 b , . . . is provided on the bottom surface of the pump cover 38 centralized in the radial direction. The group of depression-shaped grooves 38 b , 38 b , . . . is described later.
  • a groove 40 a is formed in the pump body 40 in the area in opposition to the group of concavities 36 b . Similar to the groove 38 a , the groove 40 a is formed in an approximate C-shape stretching from the upstream end to the downstream end along the direction of rotation of the impeller 36 .
  • An intake hole 42 is formed in the pump body 40 from the bottom surface of the pump body 40 to the upstream end of the groove 40 a The intake hole 42 links the interior of the pump casing 39 and the exterior (i.e., exterior of the Wesco pump 10 ).
  • a second pump flow path 46 is formed by the group of concavities 38 b and the groove 40 a .
  • a group of depression-shaped grooves 40 b , 40 b , . . . is provided in the top surface of the pump body 40 centralized in the radial direction.
  • the group of depression-shaped grooves 40 b , 40 b , . . . is described later.
  • the group of depression-shaped grooves 38 b , 38 b , . . . formed in the pump cover 38 all have the same shape and size.
  • the depression-shaped grooves 38 b extend from near the center towards the periphery in a curved shape (spiral shape).
  • the ends of the depression-shaped grooves 38 b near the periphery are shifted in the direction of rotation of the impeller 36 (in the direction of the arrow A) relative to the ends near the center.
  • the interval between adjacent depression-shaped grooves 38 b varies depending on the area in which the grooves are formed.
  • the depression-shaped grooves 38 b , 38 b , . . . formed in the area B with the discharge hole 50 in the center (one end of the area B extends to the upstream end of the groove 38 a ) are formed more closely spaced than the depression-shaped grooves 38 b , 38 b , . . . formed in the area C which is the area outside area B.
  • a distance D is provided between the outer periphery end of the depression-shaped grooves 38 b and the inner edge of the groove 38 a .
  • a flat plane doughnut shape of width D is formed between the outer periphery ends of the depression-shaped grooves 38 b , 38 b , . . . and the inner edge of the groove 38 a .
  • the depression-shaped grooves 38 b , 38 b , . . . and the groove 38 a are sealed by this flat plane.
  • the group of depression-shaped grooves 40 b , 40 b , . . . formed in the pump body 40 all have the same shape and size.
  • the depression-shaped grooves 40 b extend from the near the center towards the periphery in a curved shape (spiral shape).
  • the ends of the depression-shaped grooves 40 b near the periphery are shifted in the direction of rotation of the impeller 36 (in the direction of the arrow E) relative to the end near the center.
  • the interval between adjacent depression-shaped grooves 40 b varies depending on the area in which the grooves are formed.
  • the depression-shaped grooves 40 b , 40 b , . . . formed in the area F with the downstream end of the groove 40 a in the center (one end of the area F extends to the intake hole 42 ) are formed more closely spaced than the depression-shaped grooves 40 b , 40 b , . . . formed in the area G which is the area outside area F.
  • a distance H is provided between the outer periphery end of the depression-shaped grooves 40 b and the inner edge of the groove 40 a .
  • a flat plane doughnut shape of width H is formed between the outer periphery ends of the depression-shaped grooves 40 b , 40 b , . . . and the inner edge of the groove 40 a.
  • a group of depression-shaped grooves 38 b , 38 b . . . and a group of depression-shaped grooves 40 b , 40 b , . . . are formed in the pump cover 38 and the pump body 40 respectively.
  • the impeller 36 rotates the fuel in the clearance between the impeller 36 and the pump casing 39 is drawn into the group of depression-shaped grooves 38 b , 38 b , . . . and the group of depression-shaped grooves 40 b , 40 b . . .
  • the outer ends of the depression-shaped grooves 38 b , 40 b are shifted in the direction of rotation of the impeller 36 relative to the inner ends.
  • the direction of the viscous forces that draws the fuel into the depression-shaped grooves 38 b , 40 b acts from the center of the impeller 36 towards the Outer periphery. This direction is the same as the direction of the centrifugal force acting on the fuel within the clearance between the impeller 36 and the pump casing 39 when the impeller 36 rotates.
  • the impeller 36 rotates a force is generated that efficiently propels the fuel within the depression-shaped grooves 38 b , 40 b in the direction from the center towards the periphery.
  • the impeller 36 is pressed from both the top and bottom surfaces by the fuel propelled from the center towards the outer periphery within the group of depression-shaped grooves 38 b , 38 b , . . . and the group of depression-shaped grooves 40 b , 40 b , . . . , so the impeller 36 is maintained between the pump cover 38 and the pump body 40 .
  • the group of depression-shaped grooves 38 b , 38 b , . . . is closely spaced near the discharge hole 50 (area B), and elsewhere (area C) the group of depression-shaped grooves 38 b , 38 b , . . . is more widely spaced.
  • the group of depression-shaped grooves 40 b , 40 b , . . . is closely spaced near the downstream end of the groove 40 a (area F), and elsewhere (area G) the group of depression-shaped grooves 40 b , 40 b , . . . is more widely spaced.
  • a Wesco pump according to a second representative embodiment is explained with reference to the drawings.
  • the Wesco pump according to the second representative embodiment is constituted similar to the Wesco pump 10 according to the first representative embodiment, and differs from the first representative embodiment only in the configuration of the groups of depression-shaped grooves formed on the pump casing.
  • the points of difference between the second representative embodiment and the first representative embodiment are explained, explanation of common points is omitted.
  • a group of depression-shaped grooves 68 b , 68 b , . . . formed on a pump cover 68 extends from the center towards the periphery in curved lines.
  • the ends of the depression-shaped grooves 68 b near the periphery are shifted in the direction of rotation of the impeller 36 (the direction of arrow J) relative to the ends near the center.
  • the spacings between adjacent depression-shaped grooves 68 b , 68 b . . . are all equal.
  • the length of the group of depression-shaped grooves 68 b 1 , 68 b 1 , . . . formed in the area K with an discharge hole 50 a at the center is longer than the length of the group of depression-shaped grooves 68 b 2 , 68 b 2 , . . . formed in the area L, the area other than the area K, so the ends near the outer periphery are positioned closer to the periphery.
  • the distance M between the ends of the depression-shaped grooves 68 b 1 near the periphery and the inner edge of the groove 68 a is shorter than the distance N between the ends of the depression-shaped grooves 68 b 2 near the periphery and the inner edge of the groove 68 a .
  • a flat surface is formed in the area between the ends of the group of depression-shaped grooves 68 b , 68 b , . . . near the periphery and the inner edge of the groove 68 a.
  • a group of depression-shaped grooves 70 b , 70 b , . . . formed on a pump cover 70 extends from near the center towards the periphery in curved lines.
  • the ends of the depression-shaped grooves 70 b near the periphery are shifted in the direction of rotation of the impeller 36 (the direction of arrow P) relative to the ends near the center.
  • the spacings between adjacent depression-shaped grooves 70 b , 70 b , . . . are all equal.
  • the length of the group of depression-shaped grooves 70 b 1 , 70 b 1 , . . . formed in the area Q with the downstream end of a groove 70 a in the center (one end of the area Q extends to an intake hole 40 a ) is longer than the length of the group of depression-shaped grooves 70 b 2 , 70 b 2 , . . . formed in the area R, the area other than the area Q, so the ends near the outer periphery are positioned closer to the periphery.
  • the distance S between the ends of the depression-shaped grooves 70 b 1 near the periphery and the inner edge of the groove 70 a is shorter than the distance T between the ends of the depression-shaped grooves 70 b 2 near the periphery and the inner edge of the groove 70 a .
  • a flat surface is formed in the area between the ends of the depression-shaped group of grooves 70 b , 70 b , . . . near the periphery and the inner edge of the groove 70 a.
  • the group of depression-shaped grooves 68 b , 68 b , . . . and the group of depression-shaped grooves 70 b , 70 b , . . . are formed in the pump cover 68 and the pump body 70 respectively.
  • the group of depression-shaped grooves 68 b 1 , 68 b 1 , . . . near the discharge hole 50 a (area K) are long, and the depression-shaped group of grooves 68 b 2 , 68 b 2 , . . . formed in the other area (area L) are short.
  • the group of depression-shaped grooves 70 b 1 , 70 b 1 , . . . near the downstream end of the groove 70 a are long, and the group of depression-shaped grooves 70 b 2 , 70 b 2 , . . . in the other area (area R) are short.
  • areas K and Q where the grooves are formed longer more fuel is propelled from the center towards the periphery, so the difference in pressure applied to the top and bottom surfaces of the impeller 36 is cancelled out. In this way it is possible to suppress the inclination of the impeller 36 with respect to the axis, and contact between the impeller 36 and the pump casing 68 , 70 can be suppressed.
  • sealing can be maintained as a result of the large flat surface. As a result, leakage of fuel from the pump flow paths can be reduced.
  • depression-shaped grooves 38 b , 40 b , 68 b , 70 b are formed in both the areas B, F, K, Q near the intake hole and discharge hole and in the other areas C, G, L, R.
  • the present teachings are not limited to this type of configuration.
  • depression-shaped grooves may be formed in the areas near the intake hole and discharge hole to generate forces to cancel out the difference in pressure on the top and bottom surfaces of the impeller as much as possible, but in the other areas the depression-shaped grooves may be omitted. This is because in the areas apart from the areas near the intake hole and discharge hole, the difference in pressure applied to the top and bottom surfaces is very small.
  • the shape of the depression-shaped grooves for example, groove width, groove depth, inflow angle
  • the shape of the depression-shaped grooves for example, groove width, groove depth, inflow angle
  • depression-shaped grooves are formed in both the pump cover and pump body, but depression-shaped grooves may be formed in either one of the pump cover or the pump body. This is because depending on the type of fluid pressurized by the Wesco pump and the configuration of the intake hole and discharge hole, and the like, forming the depression-shaped grooves in only one of either the pump cover or pump body can suppress the inclination of the impeller.
  • a Wesco pump 110 according to a third representative embodiment of the present teachings is explained with reference to the drawings.
  • the Wesco pump 110 according to the third representative embodiment has a configuration that is substantially similar to the configuration of the Wesco pump 10 in the first representative embodiment.
  • the third representative embodiment differs from the Wesco pump 10 according to the first representative embodiment in that groups of depression-shaped grooves are formed on the impeller, and the clearance between the impeller and the pump casing varies in the radial direction
  • the points of difference with the first representative embodiment are explained in detail and the points in common with the first representative embodiment are omitted.
  • the Wesco pump 110 includes a motor unit 112 and a pump unit 114 .
  • the motor unit 112 has the same configuration as the motor unit 12 of the Wesco pump 10 according to the first representative embodiment.
  • the pump unit 114 includes a substantially disk-shaped impeller 136 and a pump casing 139 that houses the impeller 136 .
  • a D-shaped through hole 138 f is formed in the center of the impeller 136 .
  • the through hole 138 f is fitted to the bottom end of the shaft 120 . Therefore, the impeller 136 can move in the axial direction of the shaft 120 , but cannot rotate relative to the shaft 120 . Thus, when the shaft 120 rotates the impeller 136 also rotates.
  • the top and bottom surfaces of the impeller 136 are formed as planes substantially perpendicular to the shaft 120 .
  • a group of concavities 136 a , 136 a , . . . is formed along the periphery, and a group of depression-shaped grooves 136 c , 136 c , . . . is provided in the central part in the radial direction of the impeller 136 .
  • each of the group of concavities 136 a , 136 a , . . . formed in the top surface of the impeller 136 and each of the group of concavities 136 b , 136 b , . . . formed in the bottom surface are linked at the bottom of the concavities.
  • the depression-shaped grooves 136 c formed in the top surface of the impeller 136 extend from their end 137 c near the center to their end 137 a near the periphery in a curved shape (spiral shape). Also, a distance A is provided between the end 137 a of the depression-shaped grooves 136 c and the concavities 136 a .
  • a flat plane is formed between the ends 137 a , 137 a , . . . of the group of depression-shaped grooves 136 c , 136 c , . . . near the periphery and the group of concavities 136 a , 136 a , . . .
  • a flat plane is also formed between the group of concavities 136 a , 136 a , . . . and surface of the periphery 136 e of the impeller 136 .
  • the depression-shaped grooves 136 d formed in the bottom surface of the impeller 136 are configured in the same way as the depression-shaped grooves 136 c on the top surface as described above. Also, a flat plane is formed between the ends of the outer periphery of the depression-shaped group of grooves 136 d and the group of concavities 136 b . Furthermore, a flat plane is also formed between the group of concavities 136 b , 136 b , . . . and surface of the periphery 136 e of the impeller 136 .
  • the pump casing 139 includes a pump cover 138 and a pump body 140 .
  • a taper is formed on the casing surface 138 b of the pump cover 138 so that the clearance with the impeller 136 increases from the center of the impeller 136 towards the periphery of the impeller 136 .
  • a groove 138 a is formed in the casing surface 138 b in opposition to the group of concavities 136 a provided in the top surface of the impeller 136 .
  • a taper is also formed on the casing surface 140 b of the pump body 140 so that the clearance with the impeller 136 increases from the center of the impeller 136 towards the periphery of the impeller 136 .
  • a groove 140 a is formed in the casing surface 140 b in opposition to the group of concavities 136 b provided in the bottom surface of the impeller 136 .
  • the grooves 138 a and 140 a are formed in an approximate C-shape from the upstream end to the downstream end along the direction of rotation of the impeller 136 .
  • the upstream end of the groove 140 a is formed to that it links with the intake hole 142 in the pump body 140 .
  • the downstream end of the groove 138 a is formed to that it links with the discharge hole 150 in the pump cover 138 .
  • a first pump flow path 144 is formed by the group of concavities 136 a formed in the top surface of the impeller 136 and the groove 138 a formed in the pump cover 138 .
  • a second pump flow path 146 is formed by the group of concavities 136 b formed in the bottom surface of the impeller 136 and the groove 140 a formed in the pump body 140 .
  • the taper angle on the casing surface 138 b and the casing surface 140 b has been magnified for ease of viewing. In reality the taper angle of the casing surface 138 b and the casing surface 140 b is very small.
  • the fuel in the clearance between the impeller 136 and the pump casing 138 , 140 is drawn into the group of depression-shaped grooves 136 c , 136 c , . . . and the group of depression-shaped grooves 136 d , 136 d , . . .
  • the fuel that is drawn into the depression-shaped grooves 136 c , 136 c , . . . is guided by the wall 137 b on one side of the depression-shaped grooves 136 c , 136 c , . . . , and flows towards the end 137 a near the outer periphery of the depression-shaped grooves 136 c , 136 c , .
  • the fuel is drawn into the group of depression-shaped grooves 136 d , 136 d . . . , and flows within the depression-shaped grooves 136 d , 136 d , . . . towards the ends near the outer periphery.
  • the casing surfaces 136 b , 140 b are formed with a taper so that the clearance with the impeller 136 increases from the center of the impeller 136 towards the outer periphery of the impeller 136 .
  • the clearance between the impeller 136 and the pump casing 138 , 140 is small. Therefore, a larger lift force acts on the impeller 136 . In this way, it is possible to further reduce friction losses and wear.
  • the pump flow paths 144 , 146 are formed on the top and bottom surfaces of the impeller 136 , so the impeller 136 is subject to a force in the thrust direction as a result of the pressure difference of the fuel flowing in the first pump flow path 144 and the second pump flow path 146 .
  • the pressure difference of the fuel flowing in the first pump flow path 144 and the second pump flow path 146 varies according to position in the circumferential direction of the impeller 136 .
  • the impeller 136 is subject to non-uniform forces, so the impeller 136 inclines a very small amount
  • the casing surfaces 138 b , 140 b of the pump casing 139 are formed with a taper so that the clearance with the impeller 136 increases from the center of the impeller 136 towards the outer periphery of the impeller 136 . Therefore, even though the impeller 136 inclines slightly, the periphery of the impeller 136 does not contact the casing surfaces 138 b , 140 b (refer to FIG. 13 ). Also, if the impeller 136 inclines slightly, part of the group of depression-shaped grooves 136 c , 136 c , . . .
  • This increased pressure acts in a direction to prevent inclination of the impeller 136 , so the impeller 136 returns to a horizontal attitude. Therefore, even if the impeller 136 inclines slightly, the impeller 136 tends to return to the horizontal as a result of the lift forces generated by the group of depression-shaped grooves 136 c , 136 d . Therefore, contact between the impeller 136 and the casing surfaces 138 b , 140 b is prevented, and friction losses and wear can be reduced.
  • the lift force of the impeller 136 is increased, so it is possible to suppress friction losses and wear. Also, even if the impeller 136 inclines slightly, contact between the periphery of the impeller 136 and the casing surfaces 138 b , 140 b can be prevented. Also, forces that tend to restore the impeller 136 to the horizontal act on the impeller 136 as a result of the lift forces generated by the depression-shaped grooves 136 c , 136 d . In this way it is possible to effectively improve the performance of the pump.
  • the group of depression-shaped grooves 136 c , 136 c , . . . and the group of depression-shaped grooves 136 d , 136 d , . . . are formed on the impeller 136 that rotates, in order to generate lift forces on the impeller 136 . Therefore, in addition to centrifugal forces and viscous forces, inertial forces also act on the fuel within the group of depression-shaped grooves 136 c , 136 c , . . . and the group of depression-shaped grooves 136 d , 136 d , . . . As a result of the synergistic effect of these forces, it is possible to generate more effective lift forces.
  • the groups of depression-shaped grooves 136 c , 136 d extend from near the center of the impeller 136 towards the outer periphery of the impeller 136 in a curved shape (spiral shape). Therefore, fuel drawn in can more effectively flow towards the periphery, and a greater lift force can be obtained.
  • the group of depression-shaped grooves 136 c , 136 d formed in the impeller 136 extend from near the center of the impeller 136 towards the outer periphery in a curved shape.
  • the present teachings are not limited to this form.
  • the number, length, cross-sectional shape, and the like of the depression-shaped grooves formed on the impeller may be selected as appropriate.
  • the groups of depression-shaped grooves 136 c , 136 d may be formed on the casing surfaces 138 b , 140 b.
  • the casing surfaces 138 b , 140 b are formed in a tapered shape so that the clearance with the impeller 136 increases from near the center of the impeller 136 towards the outer periphery.
  • the present teachings are not limited to this form.
  • the top and bottom surfaces of the impeller 136 may be formed in a taper so that the clearance with the casing surfaces 138 b , 140 b increases from near the center of the impeller 136 towards the outer periphery.
  • a Wesco pump 210 according to a fourth representative embodiment is explained with reference to the drawings.
  • the Wesco pump 210 according to the fourth representative embodiment is substantially similar to the Wesco pump 10 according to the first representative embodiment.
  • the Wesco pump in the fourth representative embodiment differs from the Wesco pump 10 in the first representative embodiment in that a group of depression-shaped grooves is formed only in the bottom surface of the impeller, and the clearance between the top surface of the impeller and the pump casing varies in the radial direction.
  • the points of difference with the first representative embodiment are explained in detail, and the explanation of the points in common with the first representative embodiment are omitted.
  • the Wesco pump 210 includes a motor unit 212 and a pump unit 214 .
  • the motor unit 212 is configured in the same way as the motor unit 12 of the Wesco pump 10 according to the first representative embodiment.
  • the pump unit 214 includes a substantially disk-shaped impeller 236 and a pump casing 239 that houses the impeller 236 .
  • the top and bottom surfaces of the impeller 236 are formed in a plane shape substantially normal to a shaft 220 .
  • a group of concavities 236 b , 236 b , . . . is provided continuously in the radial direction along the outer periphery.
  • a group of concavities 236 a , 236 a , . . . is provided continuously in the radial direction along the outer periphery, and a group of depression-shaped grooves 236 c , 236 c , . . .
  • the group of concavities 236 b , 236 b , . . . formed in the top surface of the impeller 236 and the group of concavities 236 a , 236 a , . . . formed in the bottom surface are linked at the bottom of the concavities.
  • the depression-shaped grooves 236 c formed in the bottom surface of the impeller 236 extend from their end 237 c near the center to their end 237 a near the periphery in a curved shape (spiral shape). Also, a distance A is provided between the end 237 a of the depression-shaped grooves 236 c near the periphery and the concavities 236 a . In other words, a flat plane is formed between the ends 237 a , 237 a , . . . of the group of depression-shaped grooves 236 c , 236 c , . . .
  • a flat plane is also formed between the group of concavities 236 a , 236 a , . . . and surface of the periphery 236 e of the impeller 236 .
  • the pump casing 239 includes a pump cover 238 and a pump body 240 .
  • a casing surface 240 b of the pump body 240 is formed in a plane shape parallel to the bottom surface of the impeller 236 .
  • a groove 240 a is formed in the casing surface 240 b in opposition to the group of concavities 236 a , 236 a , . . . provided in the bottom surface of the impeller 236 .
  • a casing surface 238 b of the pump cover 238 is formed so that a part of the casing surface 238 b is closest to the impeller 236 , as shown in FIG. 17 .
  • the part (projecting portion 238 c ) that is closest to the impeller 236 is formed as a continuous loop in the circumferential direction.
  • a groove 238 a is formed in the casing surface 238 b in opposition to the group of concavities 236 b , 236 b , . . . provided in the top surface of the impeller 236 .
  • the grooves 238 a and 240 a are formed in an approximate C-shape from the upstream end to the downstream end along the direction of rotation of the impeller 236 .
  • the upstream end of the groove 240 a is formed to that it links with an intake hole 42 in the pump body 240
  • the downstream end of the groove 238 a is formed to that it links with a discharge hole 250 formed in the pump cover 238 .
  • a first pump flow path 244 is formed by the group of concavities 236 b formed in the top surface of the impeller 236 and the groove 238 a formed in the pump cover 238 .
  • a second pump flow path 246 is formed by the group of concavities 236 a formed in the bottom surface of the impeller 236 and the groove 240 a formed in the pump body 240 .
  • the forces acting on the impeller 236 when the impeller 236 rotates are explained.
  • the fuel is pressurized as it flows from the upstream side to the downstream side of the pump flow paths 244 , 246 .
  • the pressure of the fuel in the pump flow path 244 becomes higher than the pressure of the fuel in the pump flow path 246 .
  • the pump flow paths 244 , 246 are formed in the top and bottom surfaces of the impeller 236 , so the impeller 236 is subject to a force as a result of the difference in pressure of the fuel flowing in the first pump flow path 244 and the second pump flow path 246 .
  • the impeller 236 is subject to a force that presses the impeller 236 towards the casing surface 240 b.
  • a minute amount of the fuel expelled from the pump unit 214 into the motor unit 212 flows into the clearance between the top surface of the impeller 236 and the casing surface 238 b through the gap between the shaft 220 and a bearing 228 .
  • the pressure of the minute amount of fuel that has flowed into this clearance is high, so a force is applied to the impeller 236 in the direction of the casing surface 240 b as a result of the pressure of this fuel.
  • a minute amount of fuel flows into the clearance between the bottom surface of the impeller 236 and the casing surface 240 b .
  • Fuel that has flown into the clearance is drawn into the group of depression-shaped grooves 236 c , 236 c , . . .
  • the fuel drawn into the depression-shaped grooves 236 c , 236 c , . . . is guided by one wall 237 b of the depression-shaped grooves 236 c , 236 c , . . . and flows towards the end 237 a of the depression-shaped grooves 236 c , 236 c , . . . near the outer periphery (refer to FIG. 16 ).
  • a lift force on the impeller 236 i.e., a force acting in the direction to increase the clearance between the impeller 236 and the casing surface 240 b .
  • depression-shaped grooves are not formed on the top surface of the impeller 236 , so no lift force is generated between the top surface of the impeller 236 and the casing surface 238 b.
  • a force as a result of the pressure difference of the fuel in pump flow paths 244 , 246 a force as a result of the pressure of fuel that has flowed upstream from the motor unit 212 to the pump unit 214 through the gap between the shaft 220 and the bearing 228 , and a force due to the group of depression-shaped grooves 236 c , 236 c , . . . act on the impeller 236 .
  • the force due to the pressure difference of the fuel and the force due to the pressure of the fuel that has flowed upstream act in a direction that presses the impeller 236 towards the casing surface 240 b .
  • the lift force due to the group of depression-shaped grooves 236 c , 236 c , . . . acts in a direction to cancel out the forces pressing the impeller 236 towards the casing surface 240 b . Therefore, the impeller 236 can rotate without being pressed towards the casing surface 240 b . In this way, contact of the impeller 236 with the casing surface 240 b is suppressed, and friction losses and wear can be reduced.
  • depression-shaped grooves 236 c , 236 c , . . . are formed in the bottom surface of the impeller 236 , and depression-shaped grooves are not formed in the top surface of the impeller 236 and the casing surface 238 b . Therefore, it is possible to cancel out the forces acting to press the impeller 236 towards the casing surface 240 b by the lift forces generated by the depression-shaped grooves 236 c , 236 c , . . . In this way, pressing of the impeller 236 towards the casing surface 240 b and contact with the casing surface 240 b can be suppressed.
  • a projecting portion 238 c is formed in the casing surface 238 b to the inside of the group of concavities 236 b , 236 b , . . . as a continuous loop in the circumferential direction of the impeller 236 .
  • the clearance with the impeller 236 is smaller than in other parts, so the flow of fuel leaking from the pump flow path past the projecting portion 238 c into the clearance on the discharge hole side is suppressed. Therefore, the quantity of fuel leaking from the pump fuel path 244 can be reduced. In this way, the fuel within the casing can be efficiently pressurized, and high pump performance can be achieved.
  • depression-shaped grooves are only formed on the bottom surface of the impeller 236 , but depression-shaped grooves may also be formed in the top surface of the impeller.
  • the following is a description of a Wesco pump 310 according to a fifth representative embodiment, in which depression-shaped grooves are formed in the top surface of the impeller. The explanation is either omitted or simplified for parts that overlap with the fourth representative embodiment.
  • the Wesco pump 310 according to the fifth representative embodiment also includes a motor unit and a pump unit 314 .
  • the motor unit has the same configuration as the Wesco pump 10 according to the first representative embodiment.
  • the pump unit 314 includes a substantially disk-shaped impeller 336 and a pump casing 339 that houses the impeller 336 .
  • the configuration of the impeller 336 is substantially similar to the impeller 236 according to the fourth representative embodiment. That is, a group of concavities 336 b , 336 b , . . . is formed in the top surface of the impeller 336 . In the bottom surface of the impeller 336 , a group of concavities 336 a , 336 a , . . . and a group of depression-shaped grooves 336 c , 336 c , . . . are formed.
  • a group of depression-shaped grooves 336 d , 336 d , . . . is formed in the top surface of the impeller 336 .
  • the depression-shaped grooves 336 d are formed in the same shape as the depression-shaped grooves 336 c formed in the bottom surface of the impeller 336 . That is, the depression-shaped grooves 336 d extend from an end near the center to an end towards the periphery in a curved shape (spiral shape) However, the number of depression-shaped grooves 336 d is fewer than the number of depression-shaped grooves 336 c (refer to FIGS. 15 and 19 ).
  • the pump casing 339 includes a pump cover 338 and a pump body 340 .
  • a casing surface 340 b , groove 340 a , and intake hole 342 of the pump body 340 are formed in the same way as those of the pump body 240 according to the fourth representative embodiment.
  • the casing surface 338 b of the pump cover 338 is formed in a plane shape parallel to the top surface of the impeller 336 , as shown in FIG. 18 .
  • the groove 338 a and the discharge hole 350 of the pump cover 338 are formed in the same way as the pump cover 238 according to the fourth representative embodiment.
  • a first pump flow path 344 is formed by the group of concavities 336 b formed in the top surface of the impeller 336 and the groove 338 a formed in the pump cover 338 .
  • a second pump flow path 346 is formed by the group of concavities 338 a formed in the bottom surface of the impeller 336 and the groove 340 a formed in the pump body 340 .
  • the group of depression-shaped grooves 336 c , 338 c , . . . formed in the bottom surface of the impeller 336 generates a lift force B.
  • the lift force B acts in a direction to increase the clearance between the bottom surface of the impeller 336 and the casing surface 340 b.
  • the group of depression-shaped grooves 336 d , 336 d , . . . formed in the top surface of the impeller 336 generate a lift force C acting in a direction to increase the clearance between the top surface of the impeller 336 and the casing surface 338 b .
  • the number of grooves in the group of depression-shaped grooves 336 d , 336 d , . . . is fewer than the number of grooves in the group of depression-shaped grooves 336 c , 336 c , . . . Therefore, the lift force C is smaller than the lift force B.
  • the lift force B is larger than the lift force C, so the force obtained by subtracting the force C from the force B can act to cancel the force due to the pressure difference of the fuel and force due to the pressure of the fuel that has flowed upstream. Therefore, contact of the impeller 336 with the casing surface 340 b can be suppressed, and the impeller 336 can rotate smoothly. In this way, it is possible to improve the efficiency of the pump.
  • the impeller 336 is pressed against the casing surface 338 b as a result of fluctuations in fuel pressure, the clearance between the top surface of the impeller 336 and the casing surface 338 b is reduced. Then the fuel in this clearance is compressed, and the lift force C increases. The impeller 336 is pressed by the increased lift force C to return to the original position. Therefore, contact between the impeller 336 and the casing surface 338 b is suppressed.
  • the magnitude of the lift force C i.e., the force pressing the impeller downwards
  • the lift force B i.e., the force pressing the impeller upwards
  • the present teachings are not limited to this form.
  • the length of the depression-shaped grooves 436 d in the top surface of the impeller may be made shorter than the length of the depression-shaped grooves in the bottom surface of the impeller.
  • the width of the depression-shaped grooves 536 d in the top surface of the impeller may be made smaller than the width of the depression-shaped grooves in the bottom surface of the impeller.
  • the inflow angle in other words, the angle ⁇ formed between the depression-shaped grooves and the direction of flow of fuel within the clearance (refer to FIG. 23 )
  • the depth of the depression-shaped grooves in the top surface of the impeller may be made shallower than the depth of the depression-shaped grooves in the bottom surface of the impeller.
  • the depression-shaped grooves formed in either the impeller or in the pump casing extend from near the center of the impeller towards the outer periphery in a curved shape (spiral shape).
  • the present teachings are not limited to this form.
  • the number, length, cross-sectional shape of the depression-shaped grooves formed in the impeller or in the pump casing may be appropriately designed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US11/604,770 2005-11-28 2006-11-28 Pump Abandoned US20070122264A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2005-341956 2005-11-28
JP2005341956A JP2007146751A (ja) 2005-11-28 2005-11-28 ポンプ
JP2006002734A JP2007182851A (ja) 2006-01-10 2006-01-10 ウエスコポンプ
JP2006-002734 2006-01-10
JP2006126268A JP2007297970A (ja) 2006-04-28 2006-04-28 ポンプ
JP2006-126268 2006-04-28

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US20070122264A1 true US20070122264A1 (en) 2007-05-31

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US11/604,770 Abandoned US20070122264A1 (en) 2005-11-28 2006-11-28 Pump

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DE (1) DE102006055916A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244456A (zh) * 2013-05-06 2013-08-14 西华大学 一种离心泵叶轮
US20160201692A1 (en) * 2013-09-17 2016-07-14 Denso Corporation Fuel pump
US20180142653A1 (en) * 2015-05-28 2018-05-24 Denso Corporation Fuel pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451213A (en) * 1981-03-30 1984-05-29 Nippondenso Co., Ltd. Electrically operated fuel pump device having a regenerative component
US4586877A (en) * 1981-08-11 1986-05-06 Nippondenso Co., Ltd. Electric fuel pump device
US4854830A (en) * 1987-05-01 1989-08-08 Aisan Kogyo Kabushiki Kaisha Motor-driven fuel pump
US5607283A (en) * 1993-03-30 1997-03-04 Nippondenso Co., Ltd. Westco-type fuel pump having improved impeller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451213A (en) * 1981-03-30 1984-05-29 Nippondenso Co., Ltd. Electrically operated fuel pump device having a regenerative component
US4586877A (en) * 1981-08-11 1986-05-06 Nippondenso Co., Ltd. Electric fuel pump device
US4854830A (en) * 1987-05-01 1989-08-08 Aisan Kogyo Kabushiki Kaisha Motor-driven fuel pump
US5607283A (en) * 1993-03-30 1997-03-04 Nippondenso Co., Ltd. Westco-type fuel pump having improved impeller

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244456A (zh) * 2013-05-06 2013-08-14 西华大学 一种离心泵叶轮
US20160201692A1 (en) * 2013-09-17 2016-07-14 Denso Corporation Fuel pump
US20180142653A1 (en) * 2015-05-28 2018-05-24 Denso Corporation Fuel pump
US10233881B2 (en) * 2015-05-28 2019-03-19 Denso Corporation Fuel pump

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