WO2013125339A1

WO2013125339A1 - Electric pump

Info

Publication number: WO2013125339A1
Application number: PCT/JP2013/052504
Authority: WO
Inventors: 仲吉英記
Original assignee: アイシン精機株式会社
Priority date: 2012-02-21
Filing date: 2013-02-04
Publication date: 2013-08-29
Also published as: JP2013199922A

Abstract

The present invention addresses the problem of providing an electric pump configured so that the heat of the pump unit or of the coil which drives the pump unit is not transmitted to a control unit. The electric pump is provided with: a housing which has a housing space for both the pump unit and the control unit; an outer rotor and an inner rotor, which are provided to the pump unit, suck fluid, and rotate to discharge the fluid; a circuit board which is provided to the control unit and which controls the rotation of both the outer rotor and the inner rotor; a coil which is disposed between the pump unit and the control unit and to which electricity is supplied from the circuit board; a motor rotor which is rotated by the supply of electricity to the coil; a shaft which rotates the inner rotor by the rotation of the motor rotor; and a heat insulation member which is provided between the pump unit and the control unit and which blocks the transmission of heat.

Description

Electric pump

The present invention relates to an electric pump.

Conventionally, a pump unit that circulates a fluid, a control unit that controls rotation of the pump unit, a housing that includes the pump unit and the control unit, and a pump unit and the control unit are arranged between the pump unit and the control unit, and energization is performed by the control unit. There is known an electric pump provided with a motor unit (see, for example, Patent Document 1).

JP 2010-144595 A

However, in the electric pump shown in Patent Document 1, since the motor unit and the control unit are arranged adjacent to each other and integrated, the heat of the motor is transmitted to the control unit, and the circuit board is likely to be hot. Since it is not preferable as an operating environment of the electric pump, there is room for improvement.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to suppress the transfer of heat from the pump unit or the motor unit that drives the pump unit to the control unit.

The problem-solving means of the present invention includes a pump unit that circulates a fluid, a control unit that controls rotation of the pump unit, a housing that includes the pump unit and the control unit, and a motor that is energized by the control unit. And a heat insulating part that reduces heat transmitted from one of the motor part and the control part to the other through the housing.

According to the electric pump of the present invention, the heat of the motor unit that drives the pump unit or the pump unit is controlled by including the heat insulating unit that reduces heat transmitted from one of the motor unit and the control unit to the other through the housing. Therefore, the circuit board can be prevented from being exposed to high temperature, and the reliability of the electric pump can be ensured.

In the problem-solving means of the present invention, it is preferable that the motor unit is disposed between the pump unit and the control unit.

By disposing the motor unit between the pump unit and the control unit, the pump unit, the motor unit, and the control unit can be arranged on the same axis, and the size in the axial diameter direction can be reduced.

In the problem solving means of the present invention, the heat insulating part is preferably a heat insulating member.

Between the motor unit and the control unit, there is a heat insulating member that reduces heat transfer from one of the motor unit and the control unit to the other through the housing. It is possible to suppress the heat of the motor unit that drives the motor from being transmitted to the control unit, to reduce the exposure of the circuit board to a high temperature, and to ensure the reliability of the electric pump.

In the problem solving means of the present invention, the heat insulating part is preferably an air layer.

By having an air layer that reduces heat transfer from one of the motor unit and control unit to the other through the housing between the motor unit and control unit, the pump unit or pump unit can be driven without increasing the number of parts It is possible to suppress the heat of the motor unit to be transmitted to the control unit, to reduce the exposure of the circuit board to a high temperature, and to ensure the reliability of the electric pump.

In the problem solving means of the present invention, it is preferable that a cover for protecting the control unit is provided, and the heat insulating member is sandwiched between the housing and the cover.

When the heat insulating member is sandwiched between the housing and the cover, the heat insulating member is interposed on all the joint surfaces between the housing and the cover. Thereby, it can suppress that the heat of the motor part which drives a pump part or a pump part to a control part is added, without adding the components which fix a heat insulation member.

In the problem-solving means of the present invention, it is preferable that the cover covers the control unit from one end surface of the housing and constitutes a control unit-containing unit that includes the control unit.

The cover covers the control unit from one end surface of the housing, thereby forming a housing space that protects the control unit, and can prevent foreign matter from entering and attaching to the control unit from the outside.

In the problem solving means of the present invention, the housing includes a support portion extending between the motor portion and the control portion, and the heat insulating member uses a fixing member that fixes the housing and the cover. It is preferable that the support portion is attached to the control portion side.

The housing includes a support portion that extends between the motor portion and the control portion, and the heat insulating member is fixed to the control portion side of the support portion using a fixing member that fixes the housing and the cover. No new parts are required.

In the problem-solving means of the present invention, the housing includes a support portion that extends between the motor portion and the control portion, and the heat insulating member is formed on the control portion side of the support portion using an adhesive. It is preferable that it is attached to.

Since the housing includes a support portion extending between the motor portion and the control portion, and the heat insulating member is attached to the control portion side of the support portion using an adhesive, the number of parts for fixing the heat insulating member may be increased. Absent.

In the problem solving means of the present invention, it is preferable that the support portion is a partition wall that partitions the motor unit and the control unit, and the heat insulating member is provided along a surface of the partition wall on the control unit side.

The support part is a partition wall that divides the motor part and the control part. By providing a heat insulating part along the surface of the partition part on the control part side, the heat of the pump part or the motor part that drives the pump part is further controlled by the control part. Transmission can be suppressed, exposure of the circuit board to high temperatures can be reduced, and the reliability of the electric pump can be ensured.

In the problem-solving means of the present invention, the housing includes a control part inclusion part including the control part, and a motor part inclusion part including the motor part, and the heat insulating part includes the control part inclusion part. It is preferable to intervene between the motor part inclusion part.

The heat insulating portion is interposed between the control portion inclusion portion and the motor portion inclusion portion, so that the heat of the pump portion or the motor portion that drives the pump portion can be further suppressed from being transmitted to the control portion. Exposure to high temperatures can be reduced, and the reliability of the electric pump can be secured.

These are sectional drawings of the shaft axial direction of the electric pump which concerns on embodiment of this invention. These are sectional drawings in the II-II line of the electric pump concerning the embodiment of the present invention. These are sectional drawings of the shaft axial direction of the electric pump which concerns on the 1st modification of this invention. These are sectional drawings of the shaft axial direction of the electric pump which concerns on the 2nd modification of this invention. These are sectional drawings in the VV line of the electric pump which concerns on the 2nd modification of this invention. These are sectional drawings of the shaft axial direction of the electric pump which concerns on the 3rd modification of this invention. These are sectional drawings in the VII-VII line of the electric pump concerning the 3rd modification of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The electric pump X according to the present embodiment is used as an engine, transmission, cooling and lubrication of an HV drive motor, or as a hydraulic pressure source for various systems in an automobile, but is not limited to these uses, and other than oil It may be used to supply the fluid.

As shown in FIGS. 1 and 2, the electric pump X of this embodiment includes a motor rotor 12 (motor unit) that rotates by electromagnetic force, a pump unit 20 that includes an outer rotor 21 and an inner rotor 22 that circulate oil, and one of them. A shaft 30 that supports the motor rotor 12 and supports the inner rotor 22 on the other side and transmits the rotational force from the motor rotor 12 to the pump unit 20; a housing 40 that houses the motor rotor 12, the pump unit 20, and the shaft 30; The cover 80 that covers one end surface and protects the control unit 70, and is sandwiched between the housing 40 and the cover 80, reduces heat transmitted from the coil 11 and the motor rotor 12 through the upper wall 41d and the end surface 41x of the control unit 70. And a heat insulating member 90.

The housing 40 has a bearing portion 44 that supports at least a portion of the shaft 30 between the motor rotor 12 and the inner rotor 22.

(Motor rotor)
The motor rotor 12 is a cylindrically shaped molded product that is provided around the inner periphery of the coil 11 (motor unit) disposed in the housing 40 so as to be rotatable and has a shaft axis Y as a center. The coil 11 and the motor rotor 12 are disposed between the pump unit 20 and the control unit 70.

The motor rotor 12 includes a plurality of permanent magnets 12a along the outer peripheral portion thereof and a back yoke 12b that holds the permanent magnets 12a. A plurality of permanent magnets 12a are arranged in such a manner that N poles and S poles are alternately arranged in the circumferential direction. The back yoke 12b is a laminate of thin magnetic steel plates. By arranging the back yoke 12b close to the permanent magnet 12a, the magnetic flux density between the motor rotor 12 and the coil 11 is increased by limiting the spread of the magnetic flux of the permanent magnet 12a.

The permanent magnet 12a and the coil 11 form a motor region that causes rotational force by electromagnetic force.

In the present embodiment, an example in which the back yoke 12b, the permanent magnet 12a, and the shaft 30 are integrally molded with the resin while the permanent magnet 12a is held on the back yoke 12b is illustrated. Thus, the disk-shaped part 12c is formed by integrally molding the resin. These three members (back yoke 12b, permanent magnet 12a, and shaft 30) are assembled to the housing 40 as a rotor 60 integrally molded with resin. In this embodiment, when assembling the rotor 60 to the housing, it is possible to save the labor of bonding the permanent magnet 12a and the back yoke 12b, so that the assembly efficiency of the electric pump X is improved.

In this embodiment, the SPM (Surface Permanent Magnet) type in which the permanent magnet 12a is disposed on the outer periphery of the back yoke 12b, but the IPM (Interior Permanent Magnet) type in which the permanent magnet is disposed inside the back yoke is also possible. good. The back yoke 12b is not limited to a laminate of thin magnetic steel plates, and may be an iron ring.

(Pump part)
The pump unit 20 includes an outer rotor 21 and an inner rotor 22. The inner rotor 22 rotates around the shaft axis Y, and the outer rotor 21 is disposed outside the inner rotor 22. The outer rotor 21 is provided with a shaft axis (not shown) that is eccentric from the shaft axis Y, and is rotatably supported by the pump unit 20.

In the pump unit 20 of the present embodiment, the outer rotor 21 having rotor-type internal teeth and the inner rotor 22 having external teeth meshing with the internal teeth are illustrated, but the present invention is not limited to this mode.

The outer periphery of the inner rotor 22 is formed with a plurality of tooth portions having a tooth surface shape following a trochoid curve. On the inner periphery of the outer rotor 21, tooth portions having a number of teeth one more than the number of teeth of the inner rotor 22 are formed. The tooth profile of the outer rotor 21 is formed into a shape that contacts the tooth portion of the inner rotor 22 when the inner rotor 22 rotates. A large number of pump spaces are intermittently formed between the inner periphery of the outer rotor 21 and the outer periphery of the inner rotor 22.

(shaft)
The shaft 30 supports the motor rotor 12 on one side and supports the inner rotor 22 on the other side to transmit the rotational force from the motor rotor 12 to the pump unit 20. The shaft 30 is formed of a metal material such as steel.

As will be described later, the shaft 30 is rotatably supported by the bearing portion 44 of the second housing 42 in the radial direction and serves as a stopper for the

shaft end portions

30a and 30b that are free ends in the axial direction. It is arrange | positioned between the 1st housing recessed part 41e and the 3rd housing recessed part 43e. When the shaft 30 rotates, the motor rotor 12 and the inner rotor 22 rotate integrally with the shaft 30.

(housing)
The housing 40 accommodates the motor rotor 12, the pump unit 20, and the shaft 30. The outer shape of the housing 40 is a columnar shape with the shaft axis Y as the center.

In the present embodiment, a case where the housing 40 is constituted by three members will be described. Specifically, the housing 40 includes a first housing 41 that seals one of the shafts 30, a second housing 42 that includes a bearing portion 44, and a third housing 43 that seals the other of the shaft 30.

In the present embodiment, since the first housing 41 and the third housing 43 that seal both ends of the shaft and the second housing 42 including the bearing portion 44 can be manufactured as separate members, the shaft 30 is accommodated in each housing member. Can be individually processed. The first housing 41 includes a control unit 70 that energizes the coil 11 and controls the rotation of the pump unit 20, the coil 11, and the motor rotor 12, and the second housing 42 and the third housing 43 include the pump unit 20. .

The first housing 41, the second housing 42, and the third housing 43 may be made of metal or resin.

Bolt insertion holes 41 b and 42 b are formed in the

flange portions

41 a and 42 a that are the end portions of the first housing 41 and the second housing 42, respectively, and the flange portion 43 a that is the end portion of the third housing 43 is female. The screw part 43b is drilled. The first housing 41, the second housing 42, and the third housing 43 are connected to each other by connecting the male screw portion of the bolt 50 inserted into the bolt insertion holes 41 b and 42 b to the female screw portion 43 b and tightening. Composed.

The first housing 41 forms a control unit 70 that controls the rotation of the pump unit 20 at one end in the direction along the shaft axis Y, and the motor rotor 12 at the other end in the direction along the shaft axis Y. Is formed, and a coil 11 is formed in a portion surrounding the concave space S.

The first housing 41 is formed by sealing the coil 11 by using, for example, a resin material. The concave space S is formed with an inner peripheral wall 41c with a predetermined radius centered on the shaft axis Y, and a first housing serving as a stopper for the shaft end 30a centering on the shaft axis Y on the upper wall 41d (support portion). A recess 41e is formed. The upper wall 41 d is interposed between the coil 11 and the motor rotor 12 and the control unit 70, and partitions the coil 11 and motor rotor 12 side from the control unit 70.

The control unit 70 is mounted with a circuit board 70a including a driver circuit formed of a power transistor and a sensing processing unit for determining the rotation posture of the rotor 60 from the back electromotive force of the field coil 11b.

The coil 11 has a field coil 11b wound around a core member 11a. The core member 11a is formed in a cylindrical shape by laminating a plurality of thin magnetic steel plates in the direction of the shaft axis Y. This laminated magnetic steel sheet has an insulating structure that prevents the flow of current between the magnetic steel sheets by sandwiching an insulating film between the magnetic steel sheets. A plurality of coils 11 are annularly arranged around the shaft axis Y (FIG. 2).

The second housing 42 is made of, for example, a metal material. A projecting portion 42c that fits into the concave space S is formed on the surface facing the first housing 41, and a bearing portion 44 centered on the shaft axis Y is formed on the projecting portion 42c. The shaft 30 penetrates the bearing portion 44. The protrusion 42c is formed in a columnar shape having a radius that matches the radius of the inner peripheral wall 41c.

In the second housing 42, a circular recess 42e having a radius larger than the radius of the outer rotor 21 is formed. The circular recess 42e is formed on the side facing the third housing 43, and the pump unit 20 is supported therein. It fits so that the outer periphery of the outer rotor 21 may slidably contact with the inner periphery of the circular recessed part 42e.

The thickness (the dimension in the direction along the shaft axis Y) of the outer rotor 21 and the inner rotor 22 matches the depth of the circular recess 42e (the depth in the direction along the shaft axis Y). Therefore, when the third housing 43 is disposed at a position where the circular recess 42e is closed, the outer rotor 21 and the inner rotor 22 are disposed at a position sandwiched between the third housing 43 and the second housing 42.

When the second case 42 is brought into close contact with the first case 41, the projecting portion (inner fitting portion) 42c is fitted into the concave space S, thereby fitting with the inner peripheral wall (outer fitting portion) 41c. As a result, the relative positional relationship between the first case 41 and the second case 42 is determined, and the shaft axis Y assumed for the first case 41 and the shaft axis Y assumed for the second case 42. Can be matched with high accuracy.

If the second case 42 is brought into close contact with the first case 41 over substantially the entire circumference, the degree of sealing in the case 40 can be increased.

Further, a seal member that prevents oil from leaking from the pump unit 20 to the first housing 41 side may be provided between the first case 41 and the second case 42.

The third case 43 is formed of a metal material in a plate shape, for example, and is connected to the second case 42 on the opposite side of the first case 41. The third case 43 is provided with a suction port 43c and a discharge port 43d at a portion corresponding to the second case 42. Specifically, the discharge port 43d is arranged in a region where high pressure acts on the oil by the relative rotation of the outer rotor 21 and the inner rotor 22, and the suction port 43c is arranged in a region where low pressure acts on the oil.

Further, the third case 43 is formed with a third housing recess 43e that serves as a stopper for the shaft end 30b with the shaft axis Y as a center.

(cover)
The cover 80 is made of metal or resin, and is provided from one end face 41 x of the first housing 41 so as to cover the circuit board 70 a and constitute a space of the control unit 70. That is, the cover 80 includes and protects the control unit 70. The one end face 41x of the first housing 41 is provided with a female screw portion 41f, and the cover 80 is provided with a female screw portion 80f at a position corresponding to the female screw portion 41f provided in the first housing 41. In addition, a bolt insertion hole 81 is formed. The first housing 41 and the cover 80 are connected and fixed by screwing and tightening the male screw portion of the bolt 50f inserted into the bolt insertion hole 81 to the female screw portion 80f and the female screw portion 41f.

(Insulation member)
The heat insulating member 90 (heat insulating portion) is made of a thermoplastic resin foam material (such as urethane foam or polystyrene foam), a metal material (such as aluminum), an inorganic fiber material (such as glass wool or rock wool), or a composite material thereof. Composed. The heat insulating member 90 is provided between the coil 11 and the motor rotor 12 and the control unit 70 via the upper wall 41d in order to reduce heat transfer from the coil 11 and the motor rotor 12 to the control unit 70. The heat insulating member 90 is configured to cover one end surface 41 x of the first housing 41. The heat insulating member 90 is provided in close contact with the upper wall 41d and the end surface 41x so as to cover the surface on the control unit 70 side, and is interposed between the first housing 41 and the circuit board 70a. The heat insulating member 90 has a bolt insertion hole 90f formed at a position corresponding to the female screw portion 41f formed in the first housing 41, the female screw portion 80f formed in the cover 80, and the bolt insertion hole 81. It is. The heat insulating member 90 includes the first housing 41, the cover 80, and the male screw part 80 f and the female screw part 41 f by screwing and tightening the male screw part of the bolt 50 f inserted through the bolt insertion hole 81 and the bolt insertion hole 90 f. It is pinched and fixed. In the present embodiment, the heat insulating member 90 is attached in close contact with the recessed opening end 41g of the first housing 41, but is not necessarily in close contact with the recessed opening end 41g of the first housing 41. It does not have to be. In the present embodiment, the first housing 41 and the cover 80 constitute a control part inclusion part that contains the control part 70, and the first housing 41, the second housing 42, and the third housing 43 constitute the coil 11 and the motor rotor. A motor internal portion that includes 12 is configured. And the heat insulation member 90 is interposed between a control part inclusion part and a motor inclusion part.

The operation of this embodiment will be described.

In the electric pump X, the control unit 70 controls the power supplied to the plurality of field coils 11b, so that the magnetism acting on the permanent magnet 12a of the motor rotor 12 is reversed, and the rotor 60 is rotated by this magnetism reversal. . This rotational force is transmitted to the inner rotor 22 of the pump unit 20 through the shaft 30, the inner rotor 22 is rotated, and the outer rotor 21 is rotated in conjunction with this rotation.

By the relative rotation of the outer rotor 21 and the inner rotor 22, the respective teeth are deeply engaged with each other, so that oil in a region where high pressure acts on the oil is discharged from the discharge port 43 d, and the engagement between the respective teeth is shallow. Oil is supplied from the suction port 43c to a region where a low pressure is applied.

The temperature of the oil circulated by the pump unit 20 rises to around 100 to 120 ° C., and further the temperature rises by about 20 ° C. due to the heat generated in the coil 11, so that the temperature of the oil circulated by the pump unit 20 is increased. Is 120 ° C., the coil 11 is further heated, and the temperature of the pump unit 20 rises to about 140 ° C.

The effect of this embodiment will be described.

Between the coil 11 and the motor rotor 12 and the control unit 70, heat transmitted from one side to the other, in the present embodiment, from the coil 11 and the motor rotor 12 through the upper wall 41d and the end surface 41x of the control unit 70 is reduced. By having the heat insulating member 90, it is possible to suppress the heat of the pump unit 20 or the coil 11 that drives the pump unit 20 from being transmitted to the control unit 70 using the existing heat insulating member, and the circuit board 70a is exposed to a high temperature. And the reliability of the electric pump X can be ensured.

Further, by arranging the coil 11 and the motor rotor 12 between the pump unit 20 and the control unit 70, the pump unit 20, the coil 11, the motor rotor 12, and the control unit 70 can be arranged on the same axis, and the electric pump X The size in the radial direction can be reduced.

Further, since the heat insulating member 90 is sandwiched between the first housing 41 and the cover 80, the heat insulating member 90 is interposed on all the joint surfaces of the first housing 41 and the cover 80. Thereby, it is possible to suppress the heat of the pump unit 20 or the coil 11 that drives the pump unit 20 from being transmitted to the control unit 70 without adding a component for fixing the heat insulating member 90, and the circuit board 70a is exposed to a high temperature. The reliability of the electric pump X can be secured.

In addition, the cover 80 covers the control unit 70 from one end surface of the first housing 41, thereby forming a housing space that protects the control unit 70, and foreign matter enters from the outside and adheres to the control unit 70. Can be suppressed.

The first housing 41 includes an upper wall 41 d extending between the coil 11 and the motor rotor 12 and the control unit 70, and the heat insulating member 90 uses a bolt 50 f that fixes the first housing 41 and the cover 80. Since it is attached to the control unit 70 side of the upper wall 41d, a part for fixing the heat insulating member 90 is not newly required.

The upper wall 41d is a partition wall that partitions the coil 11 and the motor rotor 12 and the control unit 70. By providing a heat insulating member 90 along the surface of the upper wall 41d on the control unit 70 side, the pump unit 20 or It can suppress that the heat of the coil 11 which drives the pump part 20 is transmitted to a control part, can reduce that the circuit board 70a is exposed to high temperature, and can ensure the reliability of the electric pump X.

FIG. 3 is a cross-sectional view of the electric pump X according to the first modification of the present embodiment in the shaft 30 axial direction. 1 differs from the embodiment shown in FIG. 1 in that a cover 80a is provided so as to cover and protect the circuit board 70a, and is fixed to the first housing 41 by welding to constitute the control unit 70, and the first housing to be welded The heat insulating member 90a is directly attached to the first housing 41 by being bonded radially to the axial direction of the shaft 30 from the welded portion of 41 and the cover 80a. When the heat insulating member 90a is directly attached to the first housing 41, fixing means such as adhesion, bolting, spraying, electroless plating, etc. can be considered.

The effect of the first modification of the present embodiment will be described.

According to the first modification of the present embodiment, the first housing 41 includes the upper wall 41d extending between the coil 11 and the motor rotor 12 and the control unit 70, and the heat insulating member 90a includes the first housing 41 and the cover. Since it is attached to the control unit 70 side of the upper wall 41d using an adhesive for fixing 80a, a part for fixing the heat insulating member 90a is not required.

Further, since the upper wall 41d is a partition wall that partitions the control unit 70, the coil 11 side and the control unit 70 can be partitioned.

Further, the upper wall 41d is not limited to the one that partitions the coil 11 side and the control unit 70, and it is sufficient that the heat insulating member 90a can be supported. For example, it may be a support part extending in the axial direction of the shaft 30 from the outer periphery of the first housing 41a, or a lattice-like member. In this case, the heat insulating member 90a can reduce not only the heat transmitted through the upper wall 41d as the first housing 41a but also the heat transmitted through the space.

FIG. 4 is a cross-sectional view in the axial direction of the shaft 30 of the electric pump X according to the second modification of the present embodiment. FIG. 5 is a cross-sectional view taken along line VV of the electric pump X according to the second modification of the present embodiment. In the second modification of the present embodiment, the first housing 41 h includes a control unit inclusion part 41 i that contains the control part 70, and a motor inclusion part 41 j that contains the coil 11 and the motor rotor 12. This modification is different from the embodiment shown in FIGS. 1 and 2 in that an air layer 45 is interposed between the control unit inner portion 41i and the motor inner portion 41j, and the

joint portions

41k, 41l, 41m, 41n, It is a point joined at 41o. The

joint portions

41k, 41l, and 41m have

terminals

46k, 46l, and 46m inside, and electrically connect the control unit 70 and the coil 11.

The effect of the second modification of the present embodiment will be described.

According to the second modification of the present embodiment, between the coil 11 and the motor rotor 12 and the control unit 70 from one side to the other, in the present modification, the coil 11 and the motor rotor 12 to the upper wall 41d of the control unit 70 and By having the space 45 that reduces the heat transmitted through the end face 41x, it is possible to suppress the heat of the pump unit 20 or the coil 11 that drives the pump unit 20 from being transmitted to the control unit 70, and the circuit board 70a becomes high temperature. Exposure can be reduced and the reliability of the electric pump X can be secured.

FIG. 6 is a cross-sectional view in the axial direction of the shaft 30 of the electric pump X according to the third modification of the present embodiment. FIG. 7 is a cross-sectional view taken along line VII-VII of the electric pump X according to the third modification of the present embodiment. In the third modification of the present embodiment, the first housing 41p includes a control unit inclusion part 41q that contains the control part 70, and a motor inclusion part 41r that contains the coil 11 and the motor rotor 12. This modification is different from the second modification shown in FIGS. 4 and 5 in that the control part inclusion part 41q and the motor inclusion part 41r are arranged so that their longitudinal directions are orthogonal to each other, and the air layer 45a is interposed therebetween. It is the point which is interposed and joined by the joining

parts

41s, 41t and 41u.

The effect of the third modification of the present embodiment will be described.

According to the third modification of the present embodiment, the shaft of the electric pump X is changed by changing the position of the control portion inclusion portion 41q and arranging the pump portion 20, the coil 11, the motor rotor 12, and the control portion 70 in a substantially L shape. The size of the direction can be reduced.

X Electric pump 11 Coil (motor part)
12 Motor rotor (motor part)
20 Pump part 30 Shaft 41 Housing 41 First housing (housing)
42 Second housing (housing)
43 Third housing (housing)
45 Air layer (heat insulation part)
45a Air layer (heat insulation part)
90 Heat insulation member (heat insulation part)
90a Heat insulation member (heat insulation part)

Claims

A pump for circulating the fluid;
A control unit for controlling the rotation of the pump unit;
A housing including the pump unit and the control unit;
A motor unit energized by the control unit;
An electric pump provided between the motor unit and the control unit, and a heat insulating unit that reduces heat transmitted from one of the motor unit and the control unit to the other through the housing.
The electric pump according to claim 1, wherein the motor unit is disposed between the pump unit and the control unit.
The electric pump according to claim 1 or 2, wherein the heat insulating portion is a heat insulating member.
The electric pump according to claim 1 or 2, wherein the heat insulating portion is an air layer.
A cover for protecting the control unit;
The electric pump according to claim 3, wherein the heat insulating member is sandwiched between the housing and the cover.
6. The electric pump according to claim 5, wherein the cover covers the control unit from one end face of the housing and constitutes a control unit including part of the control unit.
The housing includes a support portion extending between the motor portion and the control portion,
The electric pump according to claim 3, wherein the heat insulating member is attached to the control portion side of the support portion using a fixing member that fixes the housing and the cover.
The housing includes a support portion extending between the motor portion and the control portion,
The electric pump according to claim 3, wherein the heat insulating member is attached to the control unit side of the support unit using an adhesive.
The electric pump according to claim 7 or 8, wherein the support part is a partition wall that partitions the motor part and the control part, and the heat insulating member is provided along a surface of the partition part on the control part side.
The housing includes a control part inclusion part that contains the control part, and a motor part inclusion part that contains the motor part,
The electric pump according to any one of claims 1 to 4, wherein the heat insulating portion is interposed between the control portion inclusion portion and the motor portion inclusion portion.