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200324204
FIELD OF INVENTION
rooo11 The present invention relates to a water pump, and more particularly
the present invention relates to an electric water pump for thermal management
system used in vehicles.
BACKGROUND OF THE INVENTION
[0002] In automotive sectors thermal management system performs very
important role in vehicles i.e. in commercial vehicles. To control the temperature
10 of the electric motor, inverter, battery and other systems water pump is used to
reduce the temperature. In this period of time the automotive sector is turning to
electrical vehicles. The electrical water pump is used mostly in electrical vehicles
as thermal management system.
[0003] The conventional electrical water pump consists of volute casing with
15 inlet and outlet, screw for connecting housing & rotor casing, shroud, impeller
connected to rotor, rotor casing, oring, stator with windings and terminals, oring,
housing, controller, cover, screw.
[0004] The housing consist of connector and provides support for controller
placement. The rotor consist of impeller, impeller insert, bush flange, hallow shaft,
20 bush, lamina stack, magnets, protecting casing, protecting cover. The impeller is
connected to hallow shaft by connecting to impeller insert, lamina stack is fastened
to hallow shaft, and magnets are inserted in lamina stack of rotor. The bush is fitted
at the bottom side and the bush flange is placed on the top side of the hallow
shaft. It makes the assembly complex. Also some part of water entered in
25 housing in between rotor casing and rotor is stable in the housing. The housing
includes shaft, the shaft is placed inside hollow shaft. The stator is having lamina
stack with copper windings around it. The stator is placed in the housing. The
Controller is connected to the housing.
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5
[0005] The housing is connected to volute casing with rotor casing in between
them with screw. In between rotor casing and housing the oring is placed and in
between volute casing and housing the oring is placed. Cover are connected to
housing with screw and sealed with the oring.
[0006] When the temperature of application is high than limited temperature,
the temperature sensor gives the signal to the controller. The PWM (Pulse-width
modulation) gives the output signal according to the temperature of application. As
PWM signal is given to the motor, the motor start rotating at specified speed.
[0007] In conventional electric water pump, while working of the motor the
10 water also enters in the housing, the impurities present in the water may stick to
the magnet and as time passes these impurities goes on increasing and same jams
the .P!!!!!l!.
[0008] To overcome aforementioned drawbacks present in the conventional
electric water pump, there is a need of an electric water pump with integrated rotor.
15 OBJECTS OF THE INVENTION
[0009] The main object of a present invention is to provide an integrated
electric water pump.
[00010] The another object of the present invention is to provide an electric
water pump with integrated rotor that is avoids jamming.
20 [00011] The another object of the present invention is to provide an electric
water pump with integrated rotor that is flow out the impurities from housing.
[00012] The another object of the present invention is to provide an electric
water pump with integrated rotor that is highly reliable.
[00013] The another object of the present invention is to provide an electric
25 water pump with integrated rotor that is highly durable.
' 2.
3
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[00014] The another object of the present invention is to provide an electric
water pump with integrated rotor that improves efficiency.
[00015] The another object of the present invention is to provide an electric
water pump with integrated rotor that is cost efficient.
5 [00016] The another object of the present invention is to provide an electric
water pump with integrated rotor with compact design.
SUMMARY OF THE INVENTION
[00017] The present invention relates to a water pump, and more particularly
the present invention relates to an electric water pump for thermal management
10 system used in vehicles.
[00018] An electric water pump with integrated rotor (I 00), the pump (I 00)
includes a housing ( 40) a volute casing (1 0) having atleast one inlet (170) and at least
one outlet (180), the volute casing (1 0) coupled to housing ( 40) by fastening means,
a shaft (140) coupled to housing (40) by manufacturing process, a stator assembly
15 (50) coupled to housing (40) by fastening means, a rotor assembly (20), a cover
(11 0) coupled to housing ( 40) by fasteners (80) and a controller (70) operably
coupled to bottom of the housing ( 40)/stator assembly (50) by fasteners for
controlling the speed of pump. The rotor assembly (20) comprises a shroud (120),
an impeller (190), a plurality of bushes (220) and a magnet (30), wherein the
20 plurality of bushes (220) and the magnet (30) are integrated with the impeller (190)
by manufacturing process.
[00019] In an aspect of present invention the rotor assembly (20) having hole at
center.
[00020] In an aspect of present invention the two bushes (220) integrated at top
25 of rotor assembly (20) opposite to each other and at inside of hole.
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[00021] In an aspect of present invention the two bushes (220) integrated at
bottom of rotor assembly (20) opposite to each other and at inside of hole.
[00022] In an aspect of present invention the plurality bushes (220) integrated
to rotor assembly (20) diagonally.
5 [00023] In an aspect of present invention the two bushes (220) at top of rotor
assembly (20), each integrated to inside left and right side of hole.
[00024] In an aspect of present invention the two bushes (220) at bottom of rotor
assembly (20), each integrated to inside front and rear side of hole.
[00025] In an aspect of present invention the shroud (120) coupled to the
10 impeller (190) by but not limited to welding.
15
[00026] In an aspect of present invention the integrated rotor assembly (20) flow
out the water from housing ( 40).
[00027] In an aspect of present invention the integrated rotor assembly (20)
avoids the jamming due to impurities.
[00028] In an aspect of present invention the manufacturing process like but not
limited to injection molding or insert molding or press fitting or snap fitting or
casting or alike
BRIEF DESCRIPTION OF THE DRAWINGS
[00029] The accompanying drawings constitute a part of the description and are
20 used to provide further understanding of the present invention. Such accompanying
drawings illustrate the embodiments of the present invention which are used to
describe the principles of the present invention together with the description.
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[00030] Fig. 1 shows a cross sectional view of a conventional water pump
disclosed in the prior art;
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[00031] Fig. 2 shows a cross sectional view of an electric water pump with
integrated rotor in accordance with the preferred embodiment of a present
invention.
[00032] Fig. 3 shows an exploded v1ew of an electric water pump with
5 integrated rotor in accordance with the preferred embodiment of a present
invention.
[00033] Fig. 4 shows cross sectional and isometric view of rotor assembly in
accordance with the preferred embodiment of a present invention.
[00034] Fig. 5 shows an exploded view of rotor assembly in accordance with
10 the preferred embodiment of a present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00035] As used in the description herein and throughout the claims that follow,
the meaning of "a," "an," and "the" includes plural reference unless the context
clearly dictates· otherwise. Also, as used in the description herein, the meaning of
15 "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00036] If the specification states a component or feature "may", "can", "could",
or "might" be included or have a characteristic, that particular component or feature
is not required to be included or have the characteristic.
[00037] Exemplary embodiments will now be described more fully hereinafter
20 with reference to the accompanying drawings, in which exemplary embodiments
are shown. This disclosure may however, be embodied in many different forms and
should not be construed as limited to the embodiments set forth herein.
[00038] The present invention relates to a water pump, and more particularly
the present invention relates to an electric water pump for thermal management
25 system used in vehicles.
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[00039] Referring, Fig 2, Fig 3, Fig 4 and Fig 5, an electric water pump with
integrated rotor ( 1 00), the pump (1 00) includes a housing ( 40), the housing ( 40)
made up of but not limited to metal or non metal or plastic or thermoplastic, a volute
casing (1 0) having atleast one inlet (170) and atleast one outlet (180), the volute
5 casing (1 0) made up of but not limited to metal or non metal or plastic or
thermoplastic well known in the art, the volute casing ( 1 0) coupled to housing ( 40)
by fastening means like but not limited to spin welding or press fitting or alike, a
shaft ( 140) coupled to housing ( 40) by manufacturing process process I ike but not
limited to injection molding or insert molding or press fitting or snap fitting or
10 casting or alike, the shaft (140) made up of but not limited to stainless steel, a stator
assembly (50) coupled to housing (40) by fastening means, a rotor assembly (20),
a cover (11 0) coupled to housing ( 40) by fasteners (80) and a controller (70)
operably coupled to bottom of the housing ( 40)/stator assembly (50) by fasteners
for controlling the speed of pump. The rotor assembly (20) comprises a shroud
15 (120), the shroud (120) made up of but not limited to metal or non metal or plastic
or thermoplastic, an impeller (190), a plurality of bushes (220) and a magnet (30),
the a plurality of bushes (220) made up of but not limited to metal or non metal or
plastic or thermoset plastic, the plurality of bushes (220) and the magnet (30) are
integrated with the impeller (190) by manufacturing process.
20 [00040] In an aspect of present invention the rotor assembly (20) having hole at
center.
[00041] In an aspect of present invention the two bushes (220) integrated at top
of rotor assembly (20) opposite to each other and at inside ofhole.
l00042J In an aspect of present invention the two bushes (220) integrated at
25 bottom of rotor assembly (20) opposite to each other and at inside of hole.
[00043] In an aspect of present invention the plurality bushes (220)integrated
to rotor assembly (20) diagonally.
7
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[00044] In an aspect of present invention the two bushes (220) at top of rotor
assembly (20), each integrated to inside left and right side of hole.
[00045] In an aspect of present invention the two bushes (220) at bottom of rotor
assembly (20), each integrated to inside front and rear side of hole.
5 [00046] In an aspect of present invention the shroud ( 120) coupled to the
impeller (190) by but not limited to welding, spin welding, IR (Infrared Radiation)
welding, or alike.
[00047] In an aspect of present invention the integrated rotor assembly (20) flow
-·
out the water from housing ( 40).
10 [00048] In an aspect of present invention the manufacturing process like but not
limited to injection molding or insert molding or press fitting or snap fitting or
casting or alike
[00049] Again referring Fig 4, Fig 5, the two bushes (220) integrated at top of
rotor assembly (20) opposite to each other and at inside of hole, the two bushes
15 (220) integrated at bottom of rotor assembly (20) opposite to each other and at
inside of hole, the plurality bushes (220) integrated to rotor assembly (20)
diagonally, the two bushes (220) at top of rotor assembly (20), each integrated to
inside left and right side of hole, the two bushes (220) at bottom of rotor assembly
(20), each integrated to inside front and rear side of hole, therefore while operation
20 the water easily flow out from housing due to the plurality of bushes (220).
[00050] The non limiting operational characteristics of an integrated electric
water pump (1 00) is explained here, when the temperature of application (e.g. but
not limited to thermal management system of vehicle) is high than limited
25 temperature, the temperature sensor gives the signal to the controller. Then Pulsewidth
modulation (PWM) (well known in art) of the controller (70) gives the output
signal according to the temperature of application. As PWM signal is given to the
motor, the stator produces rotating magnetic field, such that flux links with the rotor
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(20) field, then rotor (20) start to rotate at specified speed. Therefore water enters
into the pump by inlet (170), it flows from the impeller (190) and enters in the rotor
housing (40), exits from the outlet (180). Due to the arrangement of the plurality of
bushes the water entered in housing is not stable and easily flo~ out from housing
5 which avoids the sticking of impurities to magnet.
[00051] In the above detailed description, reference is made to the
accompanying drawings that form a part thereof, however, such description should
not be considered as any limitation of scope of the present invention. The structure
10 thus conceived in the present description is susceptible of numerous modifications
and variations, all the details may furthermore be replaced with elements having
technical equivalence.
[00052] ADVANTAGES
15 I. The electric water pump with integrated rotor has simple rotor assembly.
2. The electric water pump with integrated rotor avoids the jamming of pump.
3. The electric water pump with integrated rotor easily flow out the impurities.
4. The electric water pump with integrated rotor has robust rotor assembly.
20 [00053] List of reference numerals:
l. An integrated electric water pump (1 00)
2. A volute casing (I 0)
3. A rotor assembly (20)
4. An magnet (30)
25 5. A housing ( 40)
6. A stator assembly (50)
7. A controller mounting pad (60)
8. A controller (70)
9. A screw fastener (80)
30 10. A rubber seal (90)
9
1 I. A cover (11 0)
12. A shroud (120)
13. A washer thrust (130)
14. A shaft (140)
5 15. A stator terminals (150)
16. A connector main terminals ( 160)
17. An inlet (170)
18. An outlet (180)
19. An impeller (190)
10 20. A connector (21 0)
21 . A bush (220)
15
20
25
30
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5
10
15
20
CLAIMS
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200324203
We Claim,
1. An electric water pump with integrated rotor (1 00), the pump (1 00)
compnses:
a housing ( 40);
a volute casing (1 0) having atleast one inlet ( 170) and at least one
outlet ( 180), the volute casing (1 0) coupled to housing ( 40) by
fastening means;
a shaft (140) coupled to housing (40) by manufacturing process;
a stator assembly (50) coupled to housing (40) by fastening means;
a rotor assembly (20);
a cover ( 11 0) coupled to housing ( 40) by fasteners (80); and
a controller (70) operably coupled to bottom of the housing
(40)/stator assembly (50) by fasteners for controlling the speed of
pump;
wherein the rotor assembly (20) comprises a shroud ( 120), an
impeller ( 190), a plurality of bushes (220) and a magnet (30),
wherein the plurality of bushes (220) and the magnet (30) are
integrated with the impeller (190) by manufacturing process.
2. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
wherein the rotor assembly (20) having hole at center.
3. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
wherein the two bushes (220) integrated at top of rotor assembly (20)
25 opposite to each other and at inside of hole.
4. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
wherein the two bushes (220) integrated at bottom of rotor assembly (20)
opposite to each other and at inside of hole.
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5
5. The electric water pump with integrated rotor (I 00) as claimed in claim 1,
wherein the plurality bushes (220) integrated to rotor assembly (20)
diagonally.
G. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
wherein the two bushes (220) at top of rotor assembly (20), each integrated
to inside left and right side of hole.
7. The electric water pump with integrated rotor (I 00) as claimed in claim 1,
wherein the two bushes (220) at bottom of rotor assembly (20), each
integrated to inside front and rear side ofhole.
10 8. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
15
20
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wherein the shroud (120) coupled to the impeller (190) by but not limited to
welding.
9. The electric water pump with integrated rotor ( 1 00) as claimed in claim 1,
wherein the integrated rotor assembly (20) flow out the water from housing
( 40) and avoids the jamming due to impurities.
10. The electric water pump with integrated rotor (1 00) as claimed in claim 1,
wherein the manufacturing process like but not limited to injection molding
or insert molding or press fitting or snap fitting or casting or alike.