WO2022003629A1 - Pompe à eau électrique comportant un ensemble rotor amélioré - Google Patents

Pompe à eau électrique comportant un ensemble rotor amélioré Download PDF

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Publication number
WO2022003629A1
WO2022003629A1 PCT/IB2021/055931 IB2021055931W WO2022003629A1 WO 2022003629 A1 WO2022003629 A1 WO 2022003629A1 IB 2021055931 W IB2021055931 W IB 2021055931W WO 2022003629 A1 WO2022003629 A1 WO 2022003629A1
Authority
WO
WIPO (PCT)
Prior art keywords
assembly
water pump
rotor assembly
electric water
improved
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.)
Ceased
Application number
PCT/IB2021/055931
Other languages
English (en)
Inventor
Kabir BHANDARI
Amardip KUMAR
Praveen Gupta
Ashok Kumar
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.)
Padmini VNA Mechatronics Pvt Ltd
Original Assignee
Padmini VNA Mechatronics Pvt 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
Application filed by Padmini VNA Mechatronics Pvt Ltd filed Critical Padmini VNA Mechatronics Pvt Ltd
Publication of WO2022003629A1 publication Critical patent/WO2022003629A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0686—Mechanical details of the pump control unit
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly

Definitions

  • the present invention relates to an electric water pump with an improved rotor assembly. More particularly, the present invention relates to an improved rotor assembly of an electric water pump that provides compactness, requires less input torque to maintain the flow specification and has an improved overall pump efficiency with minimized pump losses.
  • Electric water pumps are frequently used in vehicle cabin heating, low pressure exhaust gar recirculation (EGR) cooling, battery cooling etc. as they allow a volume flow rate on demand when a DC voltage supply is provided for the engine and power electronics cooling, battery cooling of HEV or EV cars as well as cooling of turbocharged air for passenger cars, light duty or medium duty vehicle.
  • the water pumps were conventionally driven by a belt attached to the crankshaft of internal combustion engine which takes mechanical power from the engine to circulate coolant through the engine and heater to cool the engine or heat the vehicle's occupant cabin. Afterwards a large number of vehicles shifted towards electrically controlled brushless DC (BLDC) motor-based electric water pump which is driven by an electric motor and is controlled by a controlling unit.
  • BLDC brushless DC
  • the electric/hybrid vehicles require an electrically driven water pump for the cooling of its components and hence there is always a need of efficient and affordable electric pumps for such purpose.
  • an electric pump becomes a crucial part for the life of components of the electric/hybrid vehicle.
  • it For an electric pump to become suitable for such applications, it must meet the flow specifications and should have a high overall pump efficiency.
  • US4746270A discloses an engine water pump assembly is formed of a rotatable shaft divided along its length into a bearing portion terminating in a drive connection and a sealing portion terminating in an impeller end upon which a water impeller is mounted.
  • a tubular, journal-type bearing surrounds the shaft bearing portion.
  • a pump housing surrounds the shaft and bearing and has an integral, enlarged chamber formed on one end within which the impeller is located. The opposite end of the housing has an opening through which the shaft drive connection extends.
  • the bearing has an integral, annular flange which surrounds a part of the shaft sealing portion.
  • a seal mounted upon the shaft sealing portion seals against the flange to prevent the flow of water from the impeller chamber to the bearing part of the housing and its opening.
  • the housing is molded around the bearing to form an integral subassembly.
  • the shaft and seal may be pre-assembled and then inserted, as a subassembly, through the housing chamber towards and into the bearing and its flange.
  • this invention does not provide compactness, and neither proposes a solution to reduce input torque to maintain the flow specification and minimize pump losses.
  • the main object of the present invention is to provide an electric water pump with an improved rotor assembly that provides compactness, requires less input torque to maintain the flow specification and has an improved overall pump efficiency with minimized pump losses.
  • Another object of the present invention is to provide an improved rotor assembly with an improved impeller assembly of an electric water pump which has an outer diameter lesser than the outer diameter of the shroud member that consequently reduces the input torque required to maintain flow specification.
  • Yet another object of the present invention is to provide an improved rotor assembly which comprises an improved impeller assembly and a shroud member assembled together using a welding technique including but not limited to CIT- clean infrared welding technology, UW - ultrasonic welding, laser welding etc.
  • Still another object of the present invention is to provide a highly efficient and affordable electric pump which is compact and easy to manufacture.
  • the present invention provides an efficient electric water pump with an improved rotor assembly comprising of an improved impeller assembly and a shroud member that provides compactness, requires less input torque to maintain the flow specification and has an improved overall pump efficiency with minimized pump losses.
  • the electric water pump is compact and easy to manufacture.
  • the present invention provides an improved electric water pump comprising of a volute casing, at least one washer, a rotor assembly, a rotor casing, a stator assembly, a housing subassembly, at least one PCB assembly, a self-tapping screw, a cover, and at least one mounting assembly.
  • the rotor assembly comprises of an impeller assembly and a shroud member assembled together using a welding technique.
  • the impeller assembly has an outer diameter less than the outer diameter of the shroud member which helps in reducing the input torque required to maintain the flow specification.
  • the improved rotor assembly provides compactness, requires less input torque to maintain the flow specification and has an improved overall pump efficiency with minimized pump losses.
  • Fig. 1 shows a sectional view of electric water pump in accordance with prior art.
  • Fig. 2 shows an exploded view of electric water pump with improved rotor assembly in accordance with an embodiment of the present invention.
  • Fig. 3 shows a sectional view of electric water pump with improved rotor assembly in accordance with an embodiment of the present invention.
  • Fig. 4 shows the improved rotor assembly with improved impeller assembly in accordance with an embodiment of the present invention.
  • Fig. 5 shows a plot comparing the input torque in a conventional electric water pump and the present invention.
  • the present invention provides an efficient and high performing electric water pump with an improved rotor assembly which is compact and requires less input torque to maintain the flow specification.
  • the improved rotor assembly comprises of an improved impeller assembly wherein the outer diameter of the impeller assembly is less than the outer diameter of shroud member and said impeller assembly is assembled with a shroud member using a welding technique.
  • the present invention provides an improved electric water pump comprising of a volute casing, at least one washer, a rotor assembly, a rotor casing, a stator assembly, a housing subassembly, at least one PCB assembly, a self-tapping screw, a cover, and at least one mounting assembly.
  • the rotor assembly comprises of an impeller assembly and a shroud member assembled together using a welding technique.
  • the impeller assembly has an outer diameter less than the outer diameter of the shroud member which helps in reducing the input torque required to maintain the flow specification.
  • the improved rotor assembly provides compactness, requires less input torque to maintain the flow specification and has an improved overall pump efficiency with minimized pump losses.
  • FIG. 1 the sectional view of a conventional electric water pump in accordance with the prior art.
  • the electric pump 10 has a rotor assembly comprising of an impeller assembly 11 and a shroud member 12.
  • the outer diameter of the impeller assembly 11 is equal to the outer diameter of the shroud member 12.
  • the electric water pump 10 requires a large input torque to maintain the flow specification.
  • the electric water pump 20 with improved rotor assembly 24 comprising of a volute casing 21 at the top and a cover 22 at the bottom, a washer 23; a rotor assembly 24, a rotor casing 25, a stator assembly 26, a housing sub-assembly 27, at least one PCB assembly 28, at least one self-tapping screw 29 and at least one mounting assembly 30.
  • the rotor assembly 24 gets inserted into the rotor casing 25 with the stator assembly 26 surrounding the outer of the rotor casing 25.
  • the self-tapping screw 29 ensures that the PCB assembly 28 is at place.
  • the improved rotor assembly 24 comprises of an improved impeller assembly 31 and a shroud member 32 assembled together through a welding technique and the outer diameter of the improved impeller assembly 31 is made lesser than the outer diameter of the shroud member 32 which helps in reducing the input torque required to maintain the flow specification.
  • the improved rotor assembly provides compactness and ease of manufacturing.
  • Fig. 4 shows the improved rotor assembly with improved impeller assembly in accordance with an embodiment of the present invention.
  • the improved impeller assembly 31 and a shroud member 32 are assembled together through a welding technique including but not limited to ultrasonic welding, TIG welding, laser welding etc.
  • the outer diameter of the improved impeller assembly 31 is made lesser than the outer diameter of the shroud member 32.
  • Fig. 5 shows a plot comparing the input torque in a conventional electric water pump and the present invention.
  • the conventional electric water pump is compared on the criteria of input torque required to maintain the flow specification with the improved electric water pump having an improved impeller assembly welded to shroud member and having an outer diameter less than the outer diameter if the shroud member.
  • the input torque was found to be reduced by 2% in the present invention compared to the conventional electric pump. Therefore, the present invention provides an electric pump with improved rotor assembly that meets the flow specification, has a high overall pump efficiency and overcomes the drawbacks of the conventional electrical pump such as large input torque requirement and pump losses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne une pompe à eau électrique (20) comportant un ensemble rotor amélioré (24). Plus particulièrement, la présente invention concerne un ensemble rotor amélioré (24) d'une pompe à eau électrique (20) qui fournit une compacité, qui nécessite moins de couple d'entrée pour maintenir la spécification d'écoulement et qui affiche un rendement de pompe global amélioré avec des pertes de pompage réduites au minimum. Ledit ensemble rotor (24) comprend un ensemble roue à aubes (31) et un élément de carénage (32) soudés l'un à l'autre. Ledit ensemble roue à aubes (31) a un diamètre externe inférieur au diamètre externe de l'élément de carénage (32) de façon à fournir la compacité et à réduire le couple d'entrée.
PCT/IB2021/055931 2020-07-01 2021-07-01 Pompe à eau électrique comportant un ensemble rotor amélioré Ceased WO2022003629A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202011028020 2020-07-01
IN202011028020 2020-07-01

Publications (1)

Publication Number Publication Date
WO2022003629A1 true WO2022003629A1 (fr) 2022-01-06

Family

ID=79315787

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2021/055931 Ceased WO2022003629A1 (fr) 2020-07-01 2021-07-01 Pompe à eau électrique comportant un ensemble rotor amélioré

Country Status (1)

Country Link
WO (1) WO2022003629A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL138623B1 (en) * 1983-04-13 1986-10-31 Przed Wdrozeniowo Prod Prodryn Mobile impeller pump
US9004869B2 (en) * 2008-05-27 2015-04-14 Weir Minerals Australia, Ltd. Centrifugal pump impellers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL138623B1 (en) * 1983-04-13 1986-10-31 Przed Wdrozeniowo Prod Prodryn Mobile impeller pump
US9004869B2 (en) * 2008-05-27 2015-04-14 Weir Minerals Australia, Ltd. Centrifugal pump impellers

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