US20130034455A1 - Electric pump - Google Patents
Electric pump Download PDFInfo
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- US20130034455A1 US20130034455A1 US13/366,795 US201213366795A US2013034455A1 US 20130034455 A1 US20130034455 A1 US 20130034455A1 US 201213366795 A US201213366795 A US 201213366795A US 2013034455 A1 US2013034455 A1 US 2013034455A1
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- United States
- Prior art keywords
- motor
- impeller
- rotational axis
- chamber
- electric pump
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- 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.)
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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
- 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
Abstract
An electric pump may comprise a motor, an impeller driven by the motor, and a casing comprising a pump chamber that accommodates the impeller. The motor and the pump chamber may be disposed along a rotational axis of the impeller. The casing may comprise an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller. The motor may have an oblong cross section that is perpendicular to the rotational axis of the impeller.
Description
- This application claims priority to Japanese Patent Application No. 2011-024298 filed on Feb. 7, 2011 and Japanese Patent Application No. 2012-21583 filed on Feb. 3, 2012, the contents of which are hereby incorporated by reference into the present application.
- The present teachings relate to an electric pump.
- As electric pump that has a motor and a pump driven by the motor is known. In this type of electric pump, an impeller accommodated in a pump chamber is driven to rotate by a motor. The pump chamber and the motor are disposed along a rotational axis of the impeller (referred to as “rotational axis” hereinafter) so that an output of the motor is transmitted directly to the impeller. Since this type of electric pump is usually installed in a limited space, various techniques have conventionally been developed in order to downsize the electric motor. For example, an electric pump described in Japanese Patent Application Publication No. 2008-29113 achieves its downsizing by providing a motor thereof with a stator core without a coil end so that the motor can be shortened in a direction of the rotational axis of an impeller.
- The technology described in Japanese Patent Application Publication No. 2008-29113 downsize the electric pump by reducing the length of the motor in the direction of the rotational axis, and therefore cannot adequately improve the ability to mount the electric pump, depending on the installation environment. For example, when installing an
electric pump 100 in a space S between an object A and an object B (i.e., a space limited in an x-direction only), as shown inFIG. 14A , installing theelectric pump 100 in a manner that a rotational axis C thereof becomes parallel to a y-direction merely reduces the length of theelectric pump 100 in a direction of its rotational axis (i.e., the y-direction); therefore, such installation does not improve the ability to mount theelectric pump 100. On the other hand, when installing theelectric pump 100 in a manner that the rotational axis C thereof becomes parallel to the x-direction, as shown inFIG. 14B , an intake pipe connected to aintake port 102 for sucking fluid into a pump chamber needs to be bent at a steep angle because theintake port 102 also extends parallel to the x-direction. In other words, because the direction for downsizing the electric pump matches the direction in which the intake port extends, a problem occurs in the intake pipe. Therefore, the technology described in Japanese Patent Application Publication No. 2008-29113 cannot adequately improve the ability to mount the electric pump in the environments illustrated inFIGS. 14A and 14B . - If the intake port can be formed to extend in a direction perpendicular to the rotational axis, even the technology described in Japanese Patent Application Publication No. 2008-29113 can improve the ability to mount the electric pump. However, in this type of electric pump, the pressure of the fluid in the pump chamber is increased by the centrifugal force of the rotating impeller. For this reason, forming the intake port to extend in the direction perpendicular to the rotational axis makes it difficult to suck the fluid into the pump chamber. Therefore, in reality, it is difficult to form the intake port to extend in the direction perpendicular to the rotational axis.
- It is an object of the present teachings to provide a technology that is capable of improving the ability to mount an electric pump even when the electric pump is installed in the environments shown in
FIG. 14 . - An electric pump disclosed in the present specification comprises a motor, an impeller that is driven to rotate by the motor, and a pump chamber accommodating the impeller. The motor and the pump chamber are disposed along a rotational axis of the impeller. This electric pump further comprises an intake port for sucking fluid into the pump chamber, and a discharge port for discharging the fluid of the pump chamber. The intake port extends in a direction parallel to the rotational axis, while the discharge port extends in a direction perpendicular to the rotational axis. A cross section of the motor that is perpendicular to the rotational axis is oblong.
- In this electric pump, the cross section of the motor that is perpendicular to the rotational axis is oblong. Therefore, when a direction of the rotational axis of the electric pump is taken as a height direction, either the width or the depth of the motor is made shorter. In other words, the size of the motor is reduced in a direction perpendicular to the rotational axis. Furthermore, because the intake port extends in a direction parallel to the rotational axis, the direction in which the motor is reduced does not match the direction of the intake port. For this reason, installing the electric pump in the environments shown in
FIG. 14 does not cause the problem where the intake pipe is bent at a steep angle, and this electric pump can improve the ability to mount the electric pump. -
FIG. 1 shows a schematic cross-sectional diagram of an electric pump of Embodiment 1. -
FIG. 2 is a cross-sectional diagram taken along line II-II shown inFIG. 1 . -
FIG. 3 is a cross-sectional diagram taken along line III-III shown inFIG. 1 . -
FIG. 4 is a diagram showing a schematic configuration of a pump chamber of an electric pump of Modification 1. -
FIG. 5 is a diagram showing a schematic configuration of a motor of the electric pump of Modification 1. -
FIG. 6 is a diagram showing a schematic configuration of a pump chamber of an electric pump of Modification 2. -
FIG. 7 is a diagram showing a schematic configuration of a motor of the electric pump of Modification 2. -
FIG. 8 is a diagram showing a schematic configuration of a pump chamber of an electric pump of Modification 3. -
FIG. 9 is a diagram showing a schematic configuration of a pump chamber of an electric pump of Modification 4. -
FIG. 10 is a diagram showing a schematic configuration of a pump chamber of an electric pump of Modification 5. -
FIG. 11 is a diagram showing a modification of the motor. -
FIG. 12 is a diagram showing another modification of the motor. -
FIG. 13 is a diagram schematically showing a state in which the electric pump of the embodiment is mounted in an engine room of an automobile. -
FIGS. 14A and 14B are diagrams for illustrating problems of the electric pump of the conventional technology. -
FIG. 15 is a diagram showing a modification of the motor. -
FIG. 16 is a diagram showing another modification of the motor. -
FIG. 17 is a diagram showing another modification of the motor. -
FIG. 18 is a diagram showing another modification of the motor. -
FIG. 19 is a diagram showing another modification of the motor. -
FIG. 20 is a diagram showing another modification of the motor. -
FIG. 21 is a diagram showing another modification of the motor. -
FIG. 22 is a schematic cross-sectional diagram of an electric pump of another embodiment. - In an electric pump disclosed in the present specification, a cross section of a pump chamber that is perpendicular to the rotational axis may have an outline such that a distance between the outline and the rotational axis of the impeller changes gradually in a circumferential direction. The distance between the outline and the rotational axis of the impeller may be maximum at a point corresponding to the position of a discharge port. In this case, the cross section of a motor that is perpendicular to the rotational axis may have a first outside dimension in a first direction and a second outside dimension in a second direction perpendicular to the first direction. It is preferred that a length of the first outside dimension is longer than a length of the second outside dimension and that the discharge port extends in a direction parallel to the second direction. When the pump chamber projects from the motor in the direction perpendicular to the rotational axis when the electric pump is viewed along the rotational axis, the configuration described above can reduce the distance in which the pump chamber projects from the motor.
- Moreover, the motor may comprise a rotor connected to the impeller and a stator disposed around the rotor. When the motor is viewed along the rotational axis, a position of a center of the rotor may be different from a position of a center of the stator. Because the rotor and the impeller are connected to each other, the center (rotational axis) of the rotor matches the center (rotational axis) of the impeller. Thus, the position of the pump chamber in relation to the stator can be shifted by making the center of the rotor different from the center of the stator. As a result, when the pump chamber projects from the motor in the direction perpendicular to the rotational axis when the electric pump is viewed along the rotational axis, the position, the direction and the distance in which the pump chamber projects from the motor can be adjusted.
- The electric pump disclosed in the present specification may further comprise a motor driving circuit that drives the motor, and a circuit chamber for accommodating the motor driving circuit. In this case, the pump chamber, the motor and the circuit chamber may be disposed along the rotational axis, and the motor may be disposed between the pump chamber and the circuit chamber. With such a configuration, the pump chamber, the motor and the circuit chamber are disposed along the rotational axis. As a result, the electric pump can be prevented from increasing its size in a direction perpendicular to the rotational axis. The motor driving circuit may have a circuit substrate with circuit elements, and the circuit substrate may extend in a direction parallel to the rotational axis or in a direction perpendicular to the rotational axis.
- The electric pump disclosed in the present specification may further comprise an attaching surface that is used for attaching the electric pump to an external device. The discharge port may protrude from the attaching surface in a direction perpendicular to the attaching surface. According to this configuration, the discharge port of the electric pump may be inserted and coupled directly to an intake port of the external device, thereby reducing the number of pipes connecting the electric pump and the external device.
- An
electric pump 10 of Embodiment 1 is installed in an engine room of an automobile and used for circulating cooling water for cooling an engine, an inverter, and the like. As shown inFIG. 1 , theelectric pump 10 has acasing 12, a fixedshaft 24, arotator 23, and astator 30. - Three spaces of a
pump chamber 14, amotor chamber 16 and acircuit chamber 18 are formed inside thecasing 12. Thepump chamber 14 is formed in an upper part of thecasing 12. Anintake port 20 and a discharge port 22 (seeFIG. 2 ) that are formed in thecasing 12 are connected to thepump chamber 14. Theintake port 20 is connected to an upper end of thepump chamber 14. Theintake port 20 extends in a direction in which a rotational axis of therotator 23 extends (i.e., a z-direction). As shown inFIG. 2 , thedischarge port 22 is connected to an outer circumference of thepump chamber 14. Thedischarge port 22 extends in a tangential direction of the outer circumference of the pump chamber 14 (i.e., an x-direction). An outer shape of the pump chamber 14 (an outer shape in an x-y planar surface) is shaped in a manner that a distance between the outer shape and the rotational axis of therotator 23 changes gradually in a circumferential direction. Specifically, the distance between the outer shape and the rotational axis of therotator 23 gradually increases from a P point (a point adjacent to the discharge port 22) in clockwise direction, and becomes maximum at the position of thedischarge port 22. In other words, thepump chamber 14 has the same shape as a centrifugal pump. - The
motor chamber 16 is formed below thepump chamber 14. An upper end of themotor chamber 16 is connected to a lower end of thepump chamber 14, and themotor chamber 16 and thepump chamber 14 are communicated with each other. A lower end of the fixedshaft 24 is fixed to a bottom surface of themotor chamber 16. The fixedshaft 24 extends upward from the bottom surface of themotor chamber 16, inside themotor chamber 16, and has a tip end reaching the inside of thepump chamber 14. Thecircuit chamber 18 is formed below themotor chamber 16 and separated from thepump chamber 14 and themotor chamber 16. Thecircuit chamber 18 accommodates amotor driving circuit 37. - The
rotator 23 is attached rotatably to the fixedshaft 24. Therotator 23 has animpeller 26 and arotor 28. An upper surface of theimpeller 26 is tilted downward toward an outer circumferential end of theimpeller 26. As shown inFIG. 2 , when theimpeller 26 is viewed in a planar view (from the top ofFIG. 1 ), theimpeller 26 has a circular shape. A plurality of blades is formed at regular intervals in the upper surface of theimpeller 26. Each of the blades extends in a radial direction of theimpeller 26. Thecylindrical rotor 28 is formed below theimpeller 26. Therotor 28, made of a magnetic material, is subjected to a predetermined magnetizing process. Therotor 28 is accommodated in themotor chamber 16. Theimpeller 26 and therotor 28 are molded integrally. Therefore, when therotor 28 rotates, theimpeller 26 rotates integrally with therotor 28. - Within the
casing 12 that forms themotor chamber 16, thestator 30 is disposed so as to face therotor 28. As shown inFIG. 3 , thestator 30 has a pair ofcores coils 36 is wound around a corresponding slot ofslots 32 a to 32 c and 34 a to 34 c of thecores cores rotor 28 therebetween. Tip ends of theslots 32 a to 32 c and 34 a to 34 c of thecores rotor 28. Thecoils 36 are connected to themotor driving circuit 37 bywires 38 a (seeFIG. 1 ). Therotor 28 and theimpeller 26 are rotated by power that is supplied from themotor driving circuit 37 to thecoils 36. In the present embodiment, a motor is configured by therotor 28 and thestator 30. - As is clear in
FIG. 3 , thecores motor chamber 16 is formed, an outer shape of a cross section of thecasing 12 that is perpendicular to the rotational axis is oblong. Specifically, the outer shape is a rectangular shape with ashort side 12 a and along side 12 b. Furthermore, as is clear inFIG. 2 , when thepump chamber 14 is viewed along the rotational axis of therotator 23, thepump chamber 14 is positioned within a range corresponding to the outer shape of the section within thecasing 12 where themotor chamber 16 is formed. In other words, in the position where themotor chamber 16 is formed, thepump chamber 14 does not project from thecasing 12. - Note that, in the present embodiment, a surface on the
long side 12 b of thecasing 12 configures an attaching surface that is used for attaching the electric pump to an external device. As is clear inFIG. 2 , thedischarge port 22 protrudes from the attaching surface of thecasing 12 in a direction of theshort side 12 a (i.e., the x-direction). - The
motor driving circuit 37 that supplies power to thestator 30 is accommodated in thecircuit chamber 18 of thecasing 12. Themotor driving circuit 37 is configured by acircuit substrate 38 andcircuit elements 39 mounted onsurfaces circuit substrate 38. Themotor driving circuit 37 is connected to an external power source (e.g., a battery mounted in a vehicle), not shown, by awire 38 b. Themotor driving circuit 37 converts power supplied from the external power source, into power to be supplied to thecoil 36, and supplies the converted power to thecoil 36. - Note that the
surfaces circuit substrate 38 are formed parallel to the rotational axis of therotator 23. Therefore, compared to a case where thesurfaces circuit substrate 38 are formed perpendicular to the rotational axis of therotator 23, the outer shape of the cross section of thecasing 12 that is perpendicular to the rotational axis can be prevented from increasing in the position where thecircuit chamber 18 is formed. In the present embodiment, the outer shape of the cross section of thecasing 12 that is perpendicular to the rotational axis in the position where thecircuit chamber 18 is formed is same in the position where themotor chamber 16 is formed. - Next, operations of the
electric pump 10 are described. Once the power is supplied to thestator 30, therotator 23 rotates around the fixed shall 24. As a result, theimpeller 26 is rotated, and cooling water is sucked by theintake port 20 into thepump chamber 14. The pressure of the fluid sucked into thepump chamber 14 increases as theimpeller 26 rotates, and then discharged from thedischarge port 22 to the outside of thecasing 12. - The
electric pump 10 described above is installed between a radiator 54 and aninverter device 51 within an engine room of an automobile 56, as shown inFIG. 13 . Specifically, theelectric pump 10 is attached to theinverter device 51 such that the attaching surface of the electric pump 10 (i.e., the surface on thelong side 12 b of the casing 12) abuts against theinverter device 51. Therefore, a surface on the short side of the electric pump 10 (i.e., the surface on theshort side 12 a) matches a direction from the radiator 54 to the inverter device 51 (i.e., the x-direction in the diagram) and can increase the distance between the radiator 54 and the electric pump 10 (L-d). As a result, a collision safety space can be secured adequately between the radiator 54 and theelectric pump 10. - Moreover, in a state in which the
electric pump 10 is attached to theinverter device 51, thedischarge port 22 of theelectric pump 10 is inserted into an entrance of acooling flow path 50 for cooling adriving circuit 52 of theinverter device 51. In other words, thedischarge port 22 of theelectric pump 10 is connected directly to thecooling flow path 50 of theinverter device 51. For this reason, a pipe or the like for connecting theelectric pump 10 to theinverter device 51 is not required. On the other hand, a cooling water pipe is connected to theintake port 20 of theelectric pump 10. Because the direction in which theintake port 20 extends is perpendicular to the direction from the radiator 54 to the inverter device 51 (i.e., the x-direction in the diagram), the cooling water pipe connected to theintake port 20 does not have to be bent at a steep angle. - As is clear from the description above, by forming the stator 30 (the
casing 12 of the motor) into an oblong shape, theelectric pump 10 can be downsized in the direction of theelectric pump 10 that is perpendicular to the rotational axis. Therefore, the ability to mount theelectric pump 10 in the space between the radiator 54 and theinverter device 51 can be improved. In addition, the space for installing theelectric pump 10 can be conserved, improving the degree of freedom in laying out other devices. On the other hand, because the direction in which theintake port 20 of theelectric pump 10 extends is perpendicular to the direction of downsizing theelectric pump 10, the cooling pipe connected to theintake port 20 does not have to be bent at a steep angle. - Specific embodiment of the present teachings is described above, but this merely illustrates some representative possibilities for utilizing the present teachings and does not restrict the claims thereof. The subject matter set forth in the claims includes variations and modifications of the specific examples set forth above.
- For example, in the embodiment described above, when the
electric pump 10 is viewed along the rotational axis, thepump chamber 14 is formed so as not to project to the outside of the casing 12 (referred to as “casing of the motor,” hereinafter) at the position where the motor (28, 30) is provided. However, thepump chamber 14 may be formed so as to project to the outside of thecasing 12 of the motor, as shown inFIGS. 4 and 5 . This configuration can increase the capacity of thepump chamber 14 and improve its pumping ability. - In this case, the direction in which the
discharge port 22 extends may be oriented in any direction as long as it matches the tangential direction of the outer circumference of thepump chamber 14. However, it is preferred that thedischarge post 22 extends in a direction perpendicular to thelong side 12 b of the casing 12 (i.e., parallel to theshort side 12 a), as shown inFIG. 4 . In other words, the distance between thepump chamber 14 and the rotational axis of the rotator becomes the longest at the position of thedischarge port 22. Thus, by disposing thedischarge port 22 in the direction perpendicular to thelong side 12 b, the section where the distance between the pump chamber and the rotational axis becomes the longest is located within the range of theshort side 12 a of thecasing 12. As a result, the distance in which thepump chamber 14 projects from thecasing 12 can be reduced to the minimum. - It should be noted that, in the examples shown in
FIGS. 4 and 5 , the rotational axis of the rotor 28 (i.e., the rotational axis of the impeller 26) matches the center of thecores cores central slot 32 c where thecoil 36 is wound and a section of thecentral slot 34 c where thecoil 36 is wound, in a cross section perpendicular to the rotational axis of therotor 28. On the other hand, the outer shape of thepump chamber 14 is the shape of a centrifugal pump in which the distance between thepump chamber 14 and the rotational axis of theimpeller 26 changes gradually. Therefore, when theelectric pump 10 is viewed along the rotational axis, thepump chamber 14 projects to the outside of thecasing 12 of the motor on an upper side of thecasing 12, and is located inside thecasing 12 on a lower side (seeFIG. 4 ). - However, the
pump chamber 14 can be prevented from projecting from thecasing 12 of the motor, when viewing the electric pump along a rotational axis Cr of therotor 28, by making the central axis Cr different from a center Cs of thecores FIGS. 6 and 7 . In other words, in the examples shown inFIGS. 6 and 7 , tip end teeth parts of theslots 32 a to 32 c and 34 a to 34 c are deformed in the x-direction ofFIG. 7 . Therotor 28 is positioned in the middle of the tip end teeth parts of theslots 32 a to 32 c and 34 a to 34 c. Consequently, the rotational axis Cr of therotor 28 is shifted in the x-direction ofFIG. 7 . On the other hand, the sections of theslots coils 36 are wound are not deformed in the x-direction, so the position of the center Cs of thecores rotor 21 is shifted in the x-direction with respect to the center Cs of thecores pump chamber 14 is shifted in the x-direction with respect to the center Cs of thecores pump chamber 14 from projecting from thecasing 12 of the motor when the electric pump is viewed along the rotational axis Cr. According to this electric pump, downsizing of the electric pump can be further realized, while increasing the capacity of the pump chamber. - Note that the direction and the distance in which the rotational axis Cr of the
rotor 28 is shifted with respect to the center Cs of thecores inverter device 51 or the radiator 54 in Embodiment 1). For instance, as in the example shown inFIG. 8 , the position of the rotational axis Cr of therotor 28 may be shifted in a manner that thepump chamber 14 projects evenly in a vertical direction of thecasing 12 of the motor. Alternately, as in the example shown inFIG. 9 , the position of the rotational axis Cr of therotor 28 may be shifted in a manner that thepump chamber 14 projects only upward from thecasing 12 of the motor. - In addition, the shape of the
discharge port 22 is not limited to the shape described in the embodiment. For example, as shown inFIG. 10 , adischarge port 38 may curve along the outer circumference of thepump chamber 14 and be pulled out in the x-direction. In such an aspect, thedischarge port 38 can be positioned closer to the center of the electric pump. - Moreover, the configuration of the motor is not limited to the configuration described in each of the embodiments. For example, as shown in
FIG. 11 , acore 40 forcoupling slots 44 disposed above and below therotor 28 to each other withcoupling pieces 42 a, 42 b may be used. The positional accuracy of eachslot 44 can be increased by using thecore 40. Alternatively, as with the embodiments described above, a pair ofcores 46 may be disposed above and below therotor 28, as shown inFIG. 12 . - Furthermore, in each of the embodiments described above, the outer shape of the cross section of the
casing 12 of the motor that is perpendicular to the rotational axis is a rectangular shape; however, the outer shape is not limited to the one described in the embodiments and can be any shape as long as it is oblong. For example, the outer shape of the cross section may be an oval shape or a shape obtained by bending four sides configuring a rectangular. Furthermore, the outer shape of the cross section of thecasing 12 of the motor may have any one of shapes shown inFIGS. 15 to 21 . Specifically, as shown inFIGS. 15 and 16 , the outer shape of the cross section may have a rectangular shape with curved corner portions. As shown inFIG. 17 , the outer shape of the cross section may have a rectangular shape whose comers are planed off. As shown inFIG. 18 , the outer shape of the cross section may have a trapezoidal shape with an upper base that is shorter than a lower base. As shown inFIG. 19 , the outer shape of the cross section may have a rectangular shape with a short side which is shorter than a diameter of arotor 28. As shown inFIG. 20 , the outer shape of the cross section may have a hexagonal shape. As shown inFIG. 21 , the outer shape of the cross section may have an upper side and a lower side that diagonally extend relative to a horizontal direction. As is clear fromFIGS. 15 to 21 , each of the outer shape of the cross sections shown inFIGS. 5 to 21 has an oblong shape, and a length (a) of horizontal dimension is longer than a length (b) of the vertical dimension. Further, it is preferred that a ratio of the length (a) to the length (b) is more than or equal to 1.3 in order to increase a volume of the rotor as well as a volume of the stator. - Further, in the Embodiment 1 described above, the surfaces of the circuit substrate are formed parallel to the rotational axis of the rotator; however, as shown in
FIG. 22 , surfaces of thecircuit substrate 38 may be formed perpendicular to the rotational axis of the rotator.
Claims (15)
1. An electric pump comprising:
a motor;
an impeller driven by the motor; and
a casing comprising a pump chamber that accommodates the impeller,
wherein
the motor and the pump chamber are disposed along a rotational axis of the impeller,
the casing comprises an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller, and
the motor has an oblong cross section that is perpendicular to the rotational axis of the impeller.
2. The electric pump as in claim 1 , wherein
the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,
the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,
the oblong cross section of the motor has a first outside dimension in a first direction and a second outside dimension in a second direction perpendicular to the first direction,
a length of the first outside dimension is longer than a length of the second outside dimension, and
the discharge port extends in a direction parallel to the second direction.
3. The electric pump as in claim 2 , wherein
the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and
when the motor is viewed along the rotational axis of the impeller, a position of a center of the rotor is different from a position of a center of the stator.
4. The electric pump as in claim 3 , further comprising a motor driving circuit that drives the motor, wherein
the casing further comprises a circuit chamber that accommodates the motor driving circuit,
the pump chamber, the motor and the circuit chamber are disposed along the rotational axis of the impeller,
the motor is disposed between the pump chamber and the circuit chamber,
the motor driving circuit comprises a circuit substrate with circuit elements, and
the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.
5. The electric pump as in claim 4 , wherein
the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and
the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.
6. The electric pump as in claim 1 , further comprising a motor driving circuit that drives the motor, wherein
the casing further comprises a circuit chamber that accommodates the motor driving circuit,
the pump chamber, the motor and the circuit chamber are disposed along the rotational axis of the impeller,
the motor is disposed between the pump chamber and the circuit chamber,
the motor driving circuit comprises a circuit substrate with circuit elements, and
the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.
7. The electric pump as in claim 6 , wherein
the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,
the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,
the oblong cross section of the motor has a rectangular shape comprising a first side extending in a first direction, and a second side extending in a second direction perpendicular to the first direction,
a length of the first side is longer than a length of the second side, and
the discharge port extends in a direction parallel to the second direction.
8. The electric pump as in claim 1 , wherein
the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and
the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.
9. The electric pump as in claim 8 , wherein
the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,
the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,
the oblong cross section of the motor has a rectangular shape comprising a first side extending in a first direction and a second side extending in a second direction perpendicular to the first direction,
a length of the first side is longer than a length of the second side, and
the discharge port extends in a direction parallel to the second direction.
10. The electric pump as in claim 9 , wherein
the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and
when the motor is viewed along the rotational axis of the impeller, a position of a center of the rotor is different from a position of a center of the stator.
11. An electric pump comprising:
a motor;
an impeller driven by the motor; and
a casing comprising a pump chamber that accommodates the impeller,
wherein
the motor and the pump chamber are disposed along a rotational axis of the impeller,
the casing comprises an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller, and
the motor has a rectangular cross section that is perpendicular to the rotational axis of the impeller, the cross section of the motor comprising a first side extending in a first direction and a second side extending in a second direction perpendicular to the first direction.
12. The electric pump as in claim 11 , wherein
the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,
the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,
a length of the first side is longer than a length of the second side, and
the discharge port extends in a direction parallel to the second direction.
13. The electric pump as in claim 12 , wherein
the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and
when the motor is viewed along the rotational axis of she impeller, a position of a center of the rotor is different from a position of a center of the stator.
14. The electric pump as in claim 13 , further comprising a motor driving circuit that drives the motor, wherein
the casing further comprises a circuit chamber that accommodates the motor driving circuit,
the pump chamber, the motor and the circuit chamber arc disposed along the rotational axis of the impeller,
the motor is disposed between the pump chamber and the circuit chamber,
the motor driving circuit comprises a circuit substrate with circuit elements, and
the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.
15. The electric pump as in claim 14 , wherein
the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and
the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2011-024298 | 2011-02-07 | ||
JP2011024298 | 2011-02-07 | ||
JP2012021583A JP2012180828A (en) | 2011-02-07 | 2012-02-03 | Electric pump |
JP2012-021583 | 2012-02-03 |
Publications (1)
Publication Number | Publication Date |
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US20130034455A1 true US20130034455A1 (en) | 2013-02-07 |
Family
ID=46547152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/366,795 Abandoned US20130034455A1 (en) | 2011-02-07 | 2012-02-06 | Electric pump |
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US (1) | US20130034455A1 (en) |
JP (1) | JP2012180828A (en) |
CN (1) | CN102628444A (en) |
DE (1) | DE102012002096B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US10153677B2 (en) | 2015-01-20 | 2018-12-11 | Aisan Kogyo Kabushiki Kaisha | Stator and electric pump |
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US10145349B2 (en) * | 2014-02-06 | 2018-12-04 | Ford Global Technologies, Llc | Combined coolant and transmission pump motor drive for stop-start vehicle |
WO2016113858A1 (en) * | 2015-01-14 | 2016-07-21 | 株式会社安川電機 | Motor, and motor production method |
WO2016113859A1 (en) * | 2015-01-14 | 2016-07-21 | 株式会社安川電機 | Motor |
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Also Published As
Publication number | Publication date |
---|---|
JP2012180828A (en) | 2012-09-20 |
DE102012002096B4 (en) | 2014-04-10 |
DE102012002096A1 (en) | 2012-08-09 |
CN102628444A (en) | 2012-08-08 |
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Legal Events
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AS | Assignment |
Owner name: AISAN KOGYO KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IKEYA, MASAKI;SUGIMOTO, ATSUSHI;REEL/FRAME:027715/0298 Effective date: 20120213 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |