JP2006348802A - Electric pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric pump smaller and more efficient than conventional electric pumps. <P>SOLUTION: A first rotor 20 including blades 22 is rotatably provided in an intake port 11a side of a stator 30 of an inside of a pump casing 10 of a whole circumference flow type electric pump 1 and a second rotor 60 including blades 62 is rotatably provided in an exhaust port 12a side of the stator 30 of the inside of the pump casing 10. The stator 30 is provided with a coil 37 provided at a position facing a rotor magnet 23 of the first rotor 20 and a coil 38 provided at a position facing a rotor magnet 63 of the second rotor 60, and is constructed as one unit by sharing a back yoke 34 and a stator housing 30a. The electric pump 1 has output equivalent to output of two flat motor arranged in series by rotation of the first rotor 20 and the second rotor 60. Also, excitation control of the coil 37 and the coil 38 is independently executed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric pump, and more particularly to an all-around electric pump having an annular flow path formed between a pump casing and a stator.

Conventionally, an all-around electric pump in which an annular flow path is formed between a pump casing and a stator is known. For example, FIG. 5 is a cross-sectional explanatory view of a conventional all-around electric pump. In the electric pump shown in this figure, a rotor 120 having an impeller 121 fixed on the inner peripheral side of a stator 130 is disposed. It is driven by the inner rotor type motor.
However, the electric pump having the inner rotor type motor as shown in FIG. 5 is arranged such that the longitudinal direction of the rotor 120 is oriented in the axial direction connecting the suction port 111 and the discharge port 112 of the pump casing 110. Since the impeller 121 is provided in the part, it is difficult to shorten the dimension from the suction port 111 to the discharge port 112 of the pump casing 110. Therefore, there is a problem that it is difficult to reduce the size and it is difficult to secure a space when the vehicle is mounted.
In addition, in an electric pump that is not a full-circumferential flow type, the so-called axial gap type motor in which the rotor and the stator are opposed to each other in the direction of the rotation axis of the rotor is applied to make the electric pump thinner and smaller. Is known (for example, see Patent Document 1).
JP 2000-145682 A (FIG. 1)

The electric pump of Patent Document 1 is configured such that the handling liquid flowing in from the center of the upper end of the casing flows out from the side surface of the casing, an impeller having a magnet is provided in the casing, and a winding is provided outside the casing. The stator core is fixed. This electric pump is configured as a so-called axial gap type motor in which a gap between the rotor and the stator is provided in the rotation axis direction of the rotor, so that the rotor and the stator are thinned in the rotation axis direction. Furthermore, by disposing a stator core having a winding around a nozzle-shaped inflow portion provided at the center of the upper end of the casing, the thickness is reduced by the thickness of the winding and the stator core.
However, in the electric pump using the conventional axial gap type motor including the electric pump of Patent Document 1, there has been a demand for higher output and higher efficiency while reducing the size.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric pump that has higher output and higher efficiency than conventional ones.
Another object of the present invention is to provide an electric pump with a reduced number of members, a simplified structure as compared with the conventional one, and a reduced cost.

  According to the present invention, the object is to provide a casing having a suction port and a discharge port, a rotor portion having an impeller rotatably disposed inside the casing, and a stator supported and fixed to the casing. A first rotor portion provided on the suction port side of the stator portion, and a second rotor portion provided on the discharge port side of the stator portion. Each of the first rotor portion and the second rotor portion includes a first rotor magnet and a second rotor magnet disposed along a surface facing the stator portion, and The stator portion is solved by having a winding disposed at a position facing each of the first rotor magnet and the second rotor magnet.

As described above, in the present invention, two rotor parts having impellers are provided, one rotor part is disposed on the suction port side of the stator part, and the other rotor part is disposed on the discharge port side of the stator part. Configured. Thus, the two rotor parts are configured to face the stator part, respectively. The two rotor portions are each provided with a rotor magnet along a surface facing the stator portion, and the stator portion is provided with a winding at a position facing the rotor magnet.
That is, in the present invention, a so-called axial gap type motor in which a gap (gap) between the rotor portion and the stator portion is formed in the direction of the rotation axis of the impeller and the rotor portion is applied to the electric pump. In the axial gap type motor, the rotor portion and the stator portion can be flattened, so that the outer shape of the electric pump can be reduced to a flattened shape. Therefore, it is easy to secure an installation space when mounted on a vehicle, and the degree of freedom in design increases.
Further, since the axial gap type motor attracts the rotor magnet and the back yoke arranged on the stator side (winding side), it is not necessary to keep the rotor portion from moving relative to the stator portion. Therefore, the structure can be simplified. Further, since the rotor portion and the stator portion can be made flat and the opposing surfaces can be flat, the bearing can be supported even at one place. Therefore, the structure can be further simplified.

  Further, in the present invention, a two-rotor type configuration is provided in which a rotor portion is provided on both sides of the stator portion, and the stator portion is wound at a position facing a rotor magnet provided in each of the two rotor portions. Is provided. Therefore, by energizing these windings, the two rotor portions can be driven to rotate, and an output twice that of a single rotor type motor can be obtained. Moreover, although the stator portion is provided corresponding to each of the two rotors with respect to the winding, members other than the winding, such as the back yoke and the stator housing, can be shared. As described above, in the present invention, in the axial gap type motor having a flat shape, the stator for rotationally driving the two rotor portions is integrally configured, so that one rotor portion and one stator portion are provided. Compared with the case where two flat motors are connected in series, the electric pump can be further downsized while maintaining the same output.

Further, in the present invention, the windings are a first winding disposed at a position facing the first rotor magnet and a second winding disposed at a position facing the second rotor magnet. It is preferable that the first winding and the second winding are configured to be energized and controlled independently of each other. Thus, by independently controlling the energization of the two windings, the rotational speed of the suction-side impeller and the discharge-side impeller can be made arbitrary, and the pump action can be controlled arbitrarily. Can do. Moreover, since it is a two-rotor type, the suction port side and the discharge port side can be made symmetrical, so that the suction port side and the discharge port side can be switched and used properly.
Further, in the present invention, an annular flow path that connects the suction port and the discharge port is formed between the outer peripheral surface of the rotor portion and the stator portion and the inner peripheral surface of the casing. it can. Thus, by using an all-around flow type electric pump, the heat generated in the stator portion and the rotor portion can be cooled by the handling liquid. Moreover, since the shaft portion can be shielded from the liquid flow, durability can be improved.

In the present invention, it is preferable that the mutually opposing surfaces of the rotor portion and the stator portion are constituted by low friction surfaces. As described above, since the opposing surfaces (so-called magnetic path forming portions) of the rotor portion and the stator portion are respectively low friction surfaces, the rotor portion and the stator portion can be rotated in contact with each other. If a gap is provided between the rotor portion and the stator portion as in the prior art, the resistance increases due to the rotation of the handling liquid that has entered the gap, and the efficiency of the motor decreases. On the other hand, in the present invention, the gap is reduced and the magnetic path forming part is contact-rotated to prevent the handling liquid from entering the gap, thereby reducing the resistance and improving the motor efficiency. Therefore, pump efficiency can be improved.
In a configuration such as an inner rotor type motor or an outer rotor type motor, since the opposing surfaces of the rotor portion and the stator portion are cylindrical surfaces, mutual roundness is required and difficult to rotate in contact. That is, the opposing surfaces of the rotor portion and the stator portion need to be formed and assembled with high dimensional accuracy, which is difficult to realize. On the other hand, in the axial gap type motor as in the present invention, the opposing surfaces can be flat. Therefore, contact rotation is allowed even if the rotor portion and the stator portion are not formed with high dimensional accuracy. Thereby, improvement of pump efficiency is made easy.

In the present invention, the stator portion includes a stator housing that houses the winding therein, and the casing includes a suction-side casing that forms the suction port, a discharge-side casing that forms the discharge port, A stator fixing casing in which a stator portion is supported and fixed, and the stator fixing casing has a tubular casing connection in which one end is connected to the suction side casing and the other end is connected to the discharge side casing. And a stator support portion that is provided on the inner diameter side of the casing connection portion and supports the stator housing. As described above, by interposing the stator fixing casing in which the stator is supported and fixed between the suction side casing and the discharge side casing, the assembling property of the stator housing to the pump casing is improved.
In the present invention, it is preferable that the casing connection portion and the stator support portion are integrally formed. In addition, it is preferable that the casing connection portion, the stator support portion, and the stator housing are integrally formed. Thus, when it manufactures by integral molding, since a number of parts can be decreased, an assembly man-hour, a part management man-hour, etc. can be reduced, and a manufacturing cost can be reduced.

In the present invention, the stator support portion is provided with an insertion hole having one end communicating with the interior of the stator housing and the other end communicating with the outside of the casing. It is preferable that the power supply member connected by wiring is inserted.
Thus, by forming an insertion hole for wiring the power supply harness for supplying power to the stator inside the support member that connects the pump casing and the stator housing, the power supply harness is exposed in the annular flow path. Without the pump casing. Accordingly, it is possible to completely prevent the handling liquid from entering the stator housing from the annular flow path and the leakage of the handling liquid from the annular flow path to the outside of the pump casing without using a seal member or the like. Further, the wiring work can be easily performed.

Further, in the present invention, the stator support portion is composed of a support column protruding toward the inner diameter side of the casing connection portion, and the support column is formed so as to function as a guide member for guiding the handling liquid flowing through the annular flow path. Is preferred.
As described above, the support column for supporting and fixing the stator functions as a guide member for smoothly guiding the handling liquid flowing through the annular flow path to the downstream side, thereby turbulently flowing the handling liquid flowing down the annular flow path. And the like can be prevented. Moreover, the resistance with respect to the handling liquid which flows through the annular flow path can be reduced.

According to the present invention, the following effects can be obtained.
(A) Since the electric pump according to the present invention has a two-rotor configuration in which the rotor portions are provided on both sides of the stator portion, an output twice that of the one-rotor motor can be obtained. In addition, since the stator unit is configured integrally with a stator that rotates and drives the two rotor units by sharing a member other than the winding, compared to a series of two flat motors, it is more electric while maintaining the same output. The pump can be miniaturized. In addition, by independently controlling energization to the windings corresponding to the two rotor portions, the pump action can be controlled by arbitrarily setting the rotational speeds of the suction-side impeller and the discharge-side impeller.
(B) Further, in the electric pump of the present invention, the rotor portion and the stator portion having the impeller are provided so as to oppose each other in the rotation axis direction of the rotor portion, so that the rotor portion and the stator portion have a flat shape. Thus, the electric pump can be reduced in size as a flat shape.
(C) In the electric pump of the present invention, since the mutually opposing surfaces of the rotor portion and the stator portion are low friction surfaces, the rotor portion and the stator portion are rotated in contact with each other without reducing the pump efficiency. Can do. Thereby, the penetration of the handling liquid into the gap (gap) can be prevented, the resistance can be reduced, and the pump efficiency can be improved. Further, since the rotor portion and the stator portion are configured to face each other in the rotation axis direction of the rotor portion, contact rotation is allowed even if the rotor portion and the stator portion are not formed with high dimensional accuracy.

(D) Further, in the electric pump of the present invention, the assembly of the casing and the stator is improved by interposing a stator fixing casing for supporting and fixing the stator between the suction side casing and the discharge side casing. ing. Further, by integrally molding the casing connection portion and the stator support portion and further integrally molding the stator housing, it is possible to reduce the number of parts, and to reduce the assembly man-hours, the parts management man-hours, and the like.
(E) Further, in the electric pump of the present invention, an insertion hole for wiring a power supply harness for supplying power to the stator is formed inside the support member that connects the pump casing and the stator housing. This makes it possible to completely prevent the handling liquid from entering the stator housing from the annular flow path and the leakage of the handling liquid from the annular flow path to the outside of the pump casing.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the members, arrangements, and the like described below do not limit the present invention, and it is needless to say that various modifications can be made in accordance with the spirit of the present invention.
1 to 3 relate to an embodiment of the present invention, FIG. 1 is a front view of the casing as seen from the suction port side, and FIG. 2 is a cross-sectional explanatory view of the electric pump (A-A cross-sectional view of FIG. FIG. 3 is an exploded sectional view of the rotor and the stator. FIG. 4 is an exploded cross-sectional explanatory view of a modified rotor and stator.

(Configuration of electric pump)
The electric pump 1 according to the present embodiment is suitably used for circulating a handling liquid such as a cooling liquid of a radiator provided in a vehicle, for example, and rotates inside the pump casing 10 and the pump casing 10. The first rotor 20 and the second rotor 60 that can be arranged, the stator 30 supported and fixed inside the pump casing 10, and the control unit 40 arranged on the outer peripheral side of the pump casing 10. It is the main component. The 1st rotor 20, the 2nd rotor 60, and the stator 30 are assembled | attached by the shaft 17 mentioned later so that relative rotation is possible.
The electric pump 1 has an annular flow path in which a handling liquid flows between the inner peripheral surface of the pump casing 10 and the outer peripheral surfaces of the first rotor 20, the second rotor 60, and the stator 30. It is configured as a peripheral flow type electric pump.
Further, the electric pump 1 of this example is arranged in series in the order of the first rotor 20, the stator 30, and the second rotor 60 from the upstream side to the downstream side of the flow of the handling liquid in the pump casing 10. Has been. The first rotor 20 and the stator 30 operate as a first flat motor (so-called axial gap type motor) that is flat in the direction of the rotation axis of the rotor, and the second rotor 60 and the stator 30 are It operates as a flat motor. The first flat motor and the second flat motor are rotated about the same rotation center. Thereby, the electric pump of this example is comprised so that the output equivalent to the case where two flat motors are connected in series can be obtained. Hereinafter, each configuration will be described with reference to FIGS.

The pump casing 10 is configured by connecting a suction side casing 11 and a discharge side casing 12 by a stator fixing casing 13, and a suction port 11 a provided in the suction side casing 11 and a discharge provided in the discharge side casing 12. The outlet 12a is arranged substantially coaxially. The pump casing 10 can be formed from, for example, a synthetic resin material. Moreover, you may shape | mold not only a synthetic resin material but another non-magnetic material, for example, an aluminum alloy.
The stator fixed casing 13 that forms the central portion of the pump casing 10 includes a tubular casing connection portion 14 and a columnar stator support portion 15 that extends in a radial direction toward the inner peripheral side of the casing connection portion 14. Are integrally formed. Thus, by integrally molding the stator fixing casing, the number of parts can be reduced, and the number of assembly steps, the number of component management steps, and the like can be reduced.
A flange portion for connecting to the suction side casing 11 at the end of the casing connection portion 14 on the suction port 11a side (that is, on the upstream side in the axial direction on the central axis of the pump casing 10 connecting the suction port 11a and the discharge port 12a) 14a is extended toward the radial direction outer peripheral side. Similarly, at the end on the discharge port 12a side, a flange portion 14b for connecting to the discharge side casing 12 is extended toward the radially outer peripheral side.

The suction-side casing 11 has a suction nozzle 11b having a substantially circular cross-section provided at one end with a suction port 11a into which the liquid to be handled flows, and the diameter of the suction-side casing 11 increases from the suction nozzle 11b toward the casing connecting portion 14 side (that is, the axial downstream side) A conical inclined portion 11c, and a connecting portion 11d provided at the edge of the inclined portion 11c on the diameter expansion side. The connecting portion 11d extends from the edge of the inclined portion 11c to the downstream side in the axial direction with substantially the same diameter as the casing connecting portion 14, and the flange portion 11e extends from the connecting portion 11d toward the radially outer peripheral side. Has been issued.
In this example, an O-ring 16 is interposed between the flange portion 11e and the flange portion 14a provided at the end of the casing connection portion 14, and the flange portion 11e and the flange portion 14a are connected to a fastening member 18 such as a screw. The suction side casing 11 and the stator fixed casing 13 are assembled together by connecting together.

  Further, the discharge casing 12 is formed in the same shape as the suction casing 11 in the opposite direction along the central axis direction of the pump casing 10. That is, the discharge-side casing 12 has a substantially circular cross-section discharge nozzle 12b formed on the discharge port 12a side from which the liquid to be handled flows out, and expands from the discharge nozzle 12b toward the casing connection portion 14 side (that is, the axial upstream side). There are provided a conical inclined portion 12c having a diameter, and a connecting portion 12d provided at an edge portion on the enlarged diameter side of the inclined portion 12c. The connecting portion 12d extends from the edge of the inclined portion 12c to the upstream side in the axial direction with substantially the same diameter as the casing connecting portion 14, and the flange portion 12e extends from the connecting portion 12d toward the radially outer peripheral side. Has been. Then, an O-ring 16 is interposed between the flange portion 12e and the flange portion 14b provided at the axially downstream end of the casing connecting portion 14, and the flange portion 12e and the flange portion 14b are fastened with screws or the like. The discharge side casing 12 and the stator fixing casing 13 are integrally assembled by being connected by the member 18.

The first rotor 20 is rotatably disposed on the suction port 11 a side of the internal space of the pump casing 10. The first rotor 20 includes a rotor main body 21 having a recess 21a that opens on the discharge port 12a side, and a plurality of blades that project radially toward the conical inclined portion 11c of the suction-side casing 11 22 and a rotor magnet 23 disposed along the surface of the rotor main body 21 on the concave portion 21a side.
One end of a shaft 17 disposed on the central axis of the pump casing 10 is inserted into the recess 21 a of the rotor body 21. A sliding bearing 24 made of carbon or the like is provided on the inner periphery of the recess 21a. The shaft 17 is press-fitted and fixed to a center portion of a stator housing 30 a to be described later, and is assembled in a state where the center portion penetrates the stator 30 and both ends protrude from the stator 30.
The rotor main body 21 is rotatably supported by the shaft 17 via the sliding bearing 24. The other end of the shaft 17 is inserted into a recess 61 a provided in the second rotor 60.

The blades 22 are fixedly supported at the base end portions of the rotor main body 21 and are disposed at substantially the same angular intervals around the central axis of the pump casing 10. In the configuration of this example, when the rotor body 21 rotates around the shaft 17 described above as a rotation center, the blades 22 fixed to the rotor body 21 are rotated integrally therewith. That is, in this example, the rotor body 21 and the blades 22 provided with the sliding bearings 24 constitute an impeller. The blade 22 may be an axial flow blade, a centrifugal blade, a diagonal flow blade, or a composite type thereof.
The rotor body 21 is formed so that the rotor-side facing surface 21b (see FIG. 3) that is the surface facing the stator 30, that is, the surface around the recess 21a forms a plane that is substantially perpendicular to the axis of the shaft 17. A thin rotor magnet 23 is disposed in the circumferential direction along the rotor-side facing surface 21b. In this example, the rotor magnet 23 is integrally formed with the rotor body 21 and is arranged so that different magnetic poles are alternately arranged in the circumferential direction.

The second rotor 60 is formed in substantially the same shape as the first rotor 20, and is provided in the direction opposite to the first rotor 20 along the central axis direction of the pump casing 10.
That is, the second rotor 60 includes a plurality of rotor bodies 61 that are formed with a recess 61a that opens on the suction port 11a side, and a plurality of protrusions that protrude radially toward the conical inclined portion 12c of the discharge-side casing 12. The blade 62 and the rotor magnet 63 disposed along the surface of the rotor body 61 on the recess 61a side are configured.
A sliding bearing 64 made of carbon or the like is provided on the inner periphery of the recess 61a. Then, as described above, the other end portion of the shaft 17 is inserted into the recess 61 a, whereby the rotor main body portion 61 is rotatably supported by the shaft 17 via the sliding bearing 64.
The blades 62 are fixedly supported at the base end portions of the rotor body 61 and are disposed at substantially the same angular intervals around the central axis of the pump casing 10.
The rotor body 61 is formed with a rotor-side facing surface 61b, which is a surface facing the stator 30, so as to form a plane substantially perpendicular to the axis of the shaft 17, and a thin rotor magnet 63 faces the rotor. It is arrange | positioned in the circumferential direction along the surface 61b. The rotor magnet 63 is formed integrally with the rotor body 61 in the same manner as the rotor magnet 23, and is arranged so that different magnetic poles are alternately arranged in the circumferential direction.

The stator 30 includes a first winding 37 disposed at a position facing the first rotor magnet 23 and a second winding disposed at a position facing the second rotor magnet 63 when assembled. A wire 38, a back yoke 34 disposed between the winding 37 and the winding 38, a position detection sensor substrate 35 a provided on the surface of the back yoke 34 on the side of the winding 37, and the back yoke 34 The position detection sensor substrate 35b provided on the surface of the winding 38, and the winding 37, the winding 38, the back yoke 34, the position detection sensor substrate 35a, the position detection sensor substrate 35b, and the like are accommodated therein. And a stator housing 30a.
The stator housing 30a of this example has a thin and substantially cylindrical shape, and a through-hole into which the shaft 17 is press-fitted and fixed is formed at a substantially center. The stator housing 30 a includes a cylindrical stator housing outer peripheral portion 33, and a first stator housing main body portion 31 and a second stator housing main body portion 32 assembled on the inner peripheral side of the stator housing outer peripheral portion 33. ing.
The first stator housing main body 31 and the second stator housing main body 32 have substantially the same shape, and are arranged symmetrically with respect to the axial direction of the shaft 17 with a facing surface substantially perpendicular to the shaft 17 as a boundary. ing. The first stator housing main body portion 31 and the second stator housing main body portion 32 are joined to each other with a seal member or the like interposed therebetween, and a stator housing outer peripheral portion 33 is joined to the outer peripheral side. Thereby, the stator housing 30a has an inner space sealed against the annular flow path.
In the first stator housing main body 31, the stator facing surface 31b, which is the surface facing the first rotor 20, forms a plane that is substantially perpendicular to the axis of the shaft 17, like the rotor facing surface 21b. Is formed. Further, in the second stator housing main body 32, the stator side facing surface 32b, which is the surface facing the second rotor 60, has a plane substantially perpendicular to the axis of the shaft 17 like the rotor side facing surface 61b. It is formed to make. A hole portion 31a and a hole portion 32a that form a through hole into which the central portion of the shaft 17 is press-fitted and fixed are formed at substantially the center of each of the stator-side facing surface 31b and the stator-side facing surface 32b. .

  In this example, the first winding 37 is disposed at a position facing the rotor magnet 23 with the stator-side facing surface 31b interposed therebetween. The second winding 38 is disposed at a position facing the rotor magnet 63 with the stator side facing surface 32b interposed therebetween. The windings 37 and 38 may have a configuration in which a winding is wound around a core member such as an iron core, but may be a flat coil shape such as a pancake coil or a printed coil. In this way, the stator 30 can be made thinner.

Further, the stator housing 30a of the present example has the stator housing outer peripheral portion 33 formed on the columnar stator support portions 15 extending in a radial direction from the central portion of the pump casing 10 toward the inner peripheral side as described above. The side part is fixedly supported. In this example, since the stator housing outer peripheral portion 33 is integrally formed with the stator fixing casing 13 having the stator support portion 15, the number of parts is reduced and the number of assembling steps is reduced.
In this example, the power supply harnesses 37a and 38a for supplying power to the windings 37 and 38 disposed in the stator housing 30a are inserted into the insertion holes 36 formed in the stator support portion 15 and wired. Has been. The insertion hole 36 has one end communicating with the internal space of the stator housing 30 a and the other end communicating with the external space of the pump casing 10.
With this configuration, the insertion hole 36 can be used as a wiring passage, and the power supply harnesses 37a and 38a can be led out of the pump casing 10 without being exposed in the annular flow path. Accordingly, it is possible to completely prevent the handling liquid from entering the stator housing 30a from the annular flow path and the leakage of the handling liquid from the annular flow path to the outside of the pump casing 10 without using a seal member or the like. Further, the wiring work can be easily performed.

  In addition, the stator support portion 15 of this example includes an annular flow path formed between the inner peripheral surface of the pump casing 10 and the outer peripheral surfaces of the first rotor 20, the second rotor 60, and the stator 30. It is provided to cross. Therefore, the handling liquid flowing through the annular flow channel flows down while colliding with the stator support portion 15. At this time, it is preferable to form the stator support portion 15 so that the resistance to the handling liquid becomes smaller. For example, the cross-sectional shape of the stator support portion 15 is formed so that the longitudinal direction thereof faces the flow direction of the handling liquid, and the side face facing the upstream side and the side face facing the downstream side of the handling liquid are respectively in the flow direction. It forms so that it may become a pointed shape along. If formed in this way, the angle formed between the side surface of the stator support 15 and the flow direction of the handling liquid is reduced, so that the resistance to the handling liquid can be reduced, and the turbulent flow occurs in the handling liquid flowing down the annular channel. And the like can be prevented. And the stator support part 15 can be functioned as a guide plate with respect to a handling liquid.

  In this example, the control unit 40 is disposed on the outer peripheral side of the inclined portion 12c of the discharge casing 12. In the control unit 40, a control circuit board 41 for performing drive control of a motor constituted by the first rotor 20 or the second rotor 60 and the stator 30 is provided inside. The control circuit board 41 is connected to connectors 37b and 38b provided at the end portions of the power supply harnesses 37a and 38a described above.

Next, a characteristic configuration of the electric pump 1 of this example will be described.
In the conventional inner rotor type or outer rotor type motor in which the rotor magnet and the winding are arranged along the cylindrical surface, if the dimension in the rotation axis direction is shortened, the area of the opposing surface is reduced, and the output of the motor is reduced. However, as in this example, the first rotor 20, the stator 30, and the second rotor 60 are arranged in this order along the rotation axis of the rotor, and the rotor and the stator are opposed to each other in the direction of the rotation axis. If the motor is configured as a so-called axial gap type motor having a predetermined gap (gap) therebetween, the dimension in the rotation axis direction can be shortened without changing the area of the facing surface. Therefore, a thin flat motor can be configured without reducing the output.
Further, the first rotor 20 disposed along the central axis of the pump casing 10 has a magnetic interaction that the rotor magnet 23 receives by a magnetic field generated by energizing the winding 37 disposed in the stator 30. It is rotationally driven around the shaft 17. The second rotor 60 is rotationally driven around the shaft 17 by magnetic interaction received by the rotor magnet 63 by a magnetic field generated by energizing the winding 38 disposed on the opposite side of the winding 37. In other words, when the first rotor 20 and the stator 30 operate as a first flat motor, and the second rotor 60 and the stator 30 operate as a second flat motor, thereby connecting two flat motors in series. It is comprised so that the output equivalent to can be obtained.

In the electric pump 1 of this example, the stator 30 includes a winding 37 that interacts with the rotor magnet 23 and a winding 38 that interacts with the rotor magnet 63 inside the stator housing 30a formed integrally. The back yoke 34 is provided between the winding 37 and the winding 38. That is, in this example, the back yoke 34 is shared by the first flat motor and the second flat motor. The stator housing 30a is also shared by the first flat motor and the second flat motor.
Thus, in this example, an output equivalent to the case where two flat motors are connected in series can be obtained, and the back yoke 34 and the stator housing 30a are shared, and the winding and position detection are performed inside the stator housing 30a. By providing two sensors, the size can be further reduced as compared with the case where two flat motors are simply arranged in series. Therefore, it is easy to secure the installation space when the vehicle is mounted, and the degree of design freedom is increased.
In the axial gap type, the rotor magnet 23 and the rotor magnet 63 and the back yoke 34 are attracted by a magnetic force so that the first rotor 20 and the second rotor 60 are prevented from moving relative to the stator 30. There is no need.
In this example, the rotor side facing surface 21b and the stator side facing surface 31b are formed substantially perpendicular to the rotation axis of the first rotor 20, but the rotor side facing surface 21b and the stator side facing surface 31b. May be configured to be inclined at a predetermined angle with respect to the rotation axis of the first rotor 20. Moreover, it is good also as a structure which has a level | step difference. Even with such a configuration, the electric pump can be flattened as in this example.

  Further, in the electric pump 1 of this example, the winding 37 disposed at a position facing the rotor magnet 23 and the winding 38 disposed at a position facing the rotor magnet 63 are mutually connected by the control circuit board 41. The energization is controlled independently. In this manner, the first rotor 20 that functions as the suction-side impeller and the second rotor that functions as the discharge-side impeller by independently controlling energization to the winding 37 and the winding 38. The number of rotations of 60 can be arbitrarily set, and the pump action can be arbitrarily controlled. Moreover, since it is a two-rotor type, the suction port side and the discharge port side can be made symmetrical, so that the suction port side and the discharge port side can be switched and used properly.

(Electric pump operation)
Next, the operation of the electric pump 1 having the above-described configurations will be described.
The control unit 40 supplies power to the winding 37 of the stator 30 at a predetermined timing based on a signal from the vehicle side. Thus, when a magnetic field is generated from the winding 37, the first rotor 20 is rotated at a predetermined rotational speed by the magnetic interaction between the rotor magnet 23 and the magnetic field.
In addition, the control unit 40 supplies power to the winding 38 at a timing independent of the winding 37 based on a signal from the vehicle side. Thereby, when a magnetic field is generated in the winding 38, the second rotor 60 is rotated at a predetermined rotational speed by the magnetic interaction between the rotor magnet 63 and the magnetic field.
Then, as the first rotor 20 rotates, the blades 22 fixed to the rotor body 21 rotate in the same rotation direction. At this time, the tip of the blade 22 circulates along the inner peripheral surface of the inclined portion 11 c of the suction side casing 11. Similarly, the blades 62 circulate along the inner peripheral surface of the inclined portion 12 c of the discharge-side casing 12 based on the rotation of the second rotor 60. Then, the handling liquid moves inside the pump casing 10 based on the circulation of the blades 22 and 62, and the pumping action is executed by changing the liquid pressure of the handling liquid on the suction port side and the liquid pressure on the discharge port side. .
In this example, the winding 37 and the winding 38 are energized independently. Therefore, for example, the energization control can be performed by synchronizing the winding 37 and the winding 38. In this case, the two impellers on the suction side and the discharge side are always rotated at the same rotational speed. Further, the energization control can be performed without synchronizing the winding 37 and the winding 38. In this case, the rotational speeds of the two impellers on the suction side and the discharge side are different.
As described above, in this example, the rotational speeds of the two impellers on the suction side and the discharge side can be arbitrarily controlled, and thus the pump action can be arbitrarily controlled.

(Modification example)
In the electric pump 1 of the above embodiment, a predetermined gap (gap) is provided between the rotor side facing surface 21b and the stator side facing surface 31b and between the rotor side facing surface 61b and the stator side facing surface 32b. However, in this example, as shown in FIG. 4, the rotor-side facing surface 221b and the stator-side facing surface 231b, and the rotor-side facing surface 261b and the stator-side facing surface 232b are rotated in contact with each other, and the contact surface is reduced in friction. To improve the pump efficiency. FIG. 4 is an exploded cross-sectional explanatory view showing a state where the first rotor 220, the stator 230, and the second rotor 260 are not assembled.
When the opposing surface of the rotor and the stator is a cylindrical surface, such as an inner rotor type or outer rotor type motor, it is difficult to rotate the rotor by setting a small gap (gap) between the rotor and the stator. Met. In other words, the technical idea of rotating the opposing surfaces in contact with each other can be applied to a motor having cylindrical opposing surfaces, but in order to rotate the cylindrical opposing surfaces in contact with each other, high roundness is required. The Therefore, high dimensional accuracy is required, and it is difficult to manufacture the member.

On the other hand, it is relatively easy to rotate the opposed surfaces substantially perpendicular to the rotation axis as in this example. That is, the gap (gap) in the direction of the rotation axis can be adjusted at the time of assembly by relatively moving the opposing surface along the rotation axis. Therefore, contact rotation between the rotor-side facing surface 221b and the stator-side facing surface 231b or the rotor-side facing surface 261b and the stator-side facing surface 232b can be realized without increasing the dimensional accuracy of the members. Even if the facing surface has a predetermined inclination with respect to the rotation axis, if the type has a gap in the rotation axis direction, the gap (gap) in the rotation axis direction can be adjusted during assembly. Similarly, the contact rotation can be realized more easily than the cylindrical surface.
By rotating in contact as in this example, the handling liquid does not enter between the rotor side facing surface 221b and the stator side facing surface 231b or between the rotor side facing surface 261b and the stator side facing surface 232b. Therefore, it is possible to reduce the resistance of the handling liquid when the electric pump is driven.

  When contact rotation is performed in this way, the motor efficiency decreases due to the frictional resistance between the contact rotation surfaces, but in this example, the rotor side facing surface 221b, the stator side facing surface 231b, and the rotor side facing Each surface of the surface 261b and the stator side facing surface 232b is formed to be a low friction surface having a lower frictional resistance than the surfaces of other portions. In this example, the rotor-side facing surface 221b and the stator-side facing surface 231b are configured with a diamond coating plate 51 and an aluminum plate 52 on the surface, respectively. The diamond coating plate 51 and the aluminum plate 52 are configured to contact each other at the time of assembly. Similarly, a diamond coating plate 51 and an aluminum plate 52 are also arranged on the rotor side facing surface 61b and the stator side facing surface 32b, and these are configured to be in contact with each other at the time of assembly.

A diamond coating plate 51 and an aluminum plate 52 are disposed on the surfaces of the rotor-side facing surface 221b and the stator-side facing surface 231b, respectively, and the rotor-side facing surface 261b and the stator-side facing surface 232b are similarly more resistant to friction than other portions. In this example, the frictional resistance generated when rotating in contact is the frictional resistance generated during contact rotation when the diamond coating plate 51 and the aluminum plate 52 are not provided. Smaller than.
In order to reduce the frictional resistance, it is preferable to reduce the area of the contact rotating part. In this example, the diamond coating plate 51 and the aluminum plate 52 are disposed only in the portion where the magnetic path on the opposing surface is generated.

  As described above, in this example, the dimensions are set so that the two opposing surfaces of the rotor-side facing surface 221b and the stator-side facing surface 231b and the rotor-side facing surface 261b and the stator-side facing surface 232b rotate in contact with each other. In addition, since the surfaces of the respective opposing surfaces are low friction surfaces, the resistance of the handling liquid that enters the gap between the first rotor 220 and the stator 230 and the gap between the second rotor 260 and the stator 230 is increased. It is possible to prevent the efficiency from being lowered and to drive the motor efficiently by reducing the efficiency reduction due to the frictional resistance. Therefore, pump efficiency can be improved. The low friction surface can also be formed by providing a coating layer made of a material having good slidability such as a fluororesin or a hydrophilic polymer.

It is the front view which looked at the electric pump which concerns on one Embodiment of this invention from the suction inlet side. It is a section explanatory view of the electric pump concerning one embodiment of the present invention. It is an exploded section explanatory view of a rotor and a stator concerning one embodiment of the present invention. It is an exploded section explanatory view of the rotor and stator concerning a modification. It is sectional explanatory drawing of the electric pump of a prior art example.

Explanation of symbols

1 ... Electric pump, 10, 110 ... Pump casing,
11 ... Suction side casing, 11a, 111 ... Suction port, 11b ... Suction nozzle,
11c: Inclined part, 11d: Connection part, 11e: Flange part,
12 ... discharge side casing, 12a, 112 ... discharge port, 12b ... discharge nozzle,
12c: Inclined part, 12d: Connection part, 12e: Flange part,
DESCRIPTION OF SYMBOLS 13 ... Stator fixed casing, 14 ... Casing connection part, 14a, 14b ... Flange part 15 ... Stator support part, 16 ... O-ring, 17 ... Shaft, 18 ... Fastening member 20 ... 1st rotor, 21 ... Rotor main-body part, 21a ··· recess, 21b ··· rotor facing surface 22 ··· blades, 23 · · · rotor magnet, 24 · · · slide bearing 30 ··· stator, 30a · · · stator housing
31... First stator housing main body, 31 b. Stator side facing surface, 31 a... Hole 32. Second stator housing main body, 32 b .. Stator side facing surface, 32 a. 35a, 35b ... position detection sensor board, 36 ... insertion hole 37, 38 ... winding, 37a, 38a ... feeding harness, 37b, 38b ... connector 40 ... control unit, 41 ... control circuit board 51 ... diamond coating plate, 52 ... Aluminum plate 60 ... Second rotor, 61 ... Rotor body, 61a ... Recess, 61b ... Rotor side facing surface 62 ... Blade, 63 ... Rotor magnet, 64 ... Sliding bearing 120 ... Rotor, 121 ... Impeller, 130 ...... Stator

Claims (9)

A casing having a suction port and a discharge port, a rotor portion having an impeller rotatably disposed inside the casing, and a stator portion supported and fixed to the casing,
The rotor portion includes a first rotor portion provided on the suction port side of the stator portion, and a second rotor portion provided on the discharge port side of the stator portion,
Each of the first rotor portion and the second rotor portion includes a first rotor magnet and a second rotor magnet disposed along a surface facing the stator portion, and the stator portion is An electric pump comprising windings disposed at positions facing each of the first rotor magnet and the second rotor magnet.   The winding includes a first winding disposed at a position facing the first rotor magnet, and a second winding disposed at a position facing the second rotor magnet. The electric pump according to claim 1, wherein the first winding and the second winding are energized and controlled independently of each other.   The annular flow path which connects the said suction inlet and the said discharge outlet between the outer peripheral surface of the said rotor part and the said stator part, and the internal peripheral surface of the said casing is formed. Electric pump.   2. The electric pump according to claim 1, wherein at least one of the first rotor portion and the second rotor portion and a surface of the stator portion facing each other are low friction surfaces. The stator portion has a stator housing that houses the winding therein.
The casing includes a suction side casing that forms the suction port, a discharge side casing that forms the discharge port, and a stator fixing casing to which the stator portion is supported and fixed.
The stator fixing casing has a tubular casing connecting portion whose one end is connected to the suction side casing and the other end is connected to the discharge side casing, and is provided on the inner diameter side of the casing connecting portion and supports the stator housing. The electric pump according to claim 1, further comprising a stator support portion.   The electric pump according to claim 5, wherein the casing connection portion and the stator support portion are integrally formed.   The electric pump according to claim 5, wherein the casing connection portion, the stator support portion, and the stator housing are integrally formed.   The stator support portion is provided with an insertion hole having one end communicating with the interior of the stator housing and the other end communicating with the outside of the casing. The feeding member is connected to the winding by wiring. The electric pump according to any one of claims 5 to 7, wherein is inserted.   The said stator support part consists of a support | pillar which protrudes to the internal diameter side of the said casing connection part, This support | pillar has a shape which functions as a guide member which guides the handling liquid which flows through the said annular flow path. The electric pump according to any one of claims 5 to 8.

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