JP2012241565A - Electric pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric pump of which the productivity is easily improved.SOLUTION: The electric pump includes: a rotor-side case 16 which houses a rotary member 14 having an impeller 9 at one end and a rotor 3b at the other end and a stator 3a provided around the rotary member; an intermediate case 7 which holds a circuit board 11 for electric power supply control over the stator; and a cover case 8. The rotor-side case and cover case are joined together with the intermediate case interposed between them, and the circuit board is held in the intermediate case while protruding toward the cover case as compared with the position of a joining surface 19b of the intermediate case to the cover case.

Description

  The present invention provides a rotating member having an impeller at one end and a rotor at the other end, a rotor-side case for housing a stator provided around the rotating member, and an intermediate case for holding a circuit board for controlling current supply to the stator. And an electric pump in which the rotor side case and the lid case are joined with the intermediate case interposed therebetween.

Circuit boards for controlling energization to the stator include flow soldering, in which connection terminals such as electronic components connected to the circuit board are immersed in molten solder for electrical connection, and dip coating in which the circuit board is immersed in a coating solution. Applied.
Conventionally, in the electric pump, the circuit board is held by the intermediate case so as to enter inside the intermediate case (see, for example, Patent Document 1).

JP 2004-183595 A

For this reason, when performing flow soldering or dip coating on a circuit board, if it is performed on a circuit board held on the intermediate case, molten solder or coating liquid will adhere to the intermediate case.
Therefore, it is necessary to assemble a circuit board that has been subjected to flow soldering or dip coating in advance in the intermediate case, and the handling of the circuit board becomes complicated, which may reduce productivity.
This invention is made | formed in view of the said situation, Comprising: It aims at providing the electric pump which aims at improvement of productivity easily.

  A first characteristic configuration of an electric pump according to the present invention includes: a rotating member having an impeller at one end and a rotor at the other end; a rotor-side case that houses a stator provided around the rotating member; An intermediate case for holding the circuit board, and a lid case, the rotor side case and the lid case are joined with the intermediate case interposed therebetween, and the circuit board is joined to the lid case of the intermediate case It is in the point hold | maintained at the said intermediate | middle case in the state which protruded in the side of the said cover case compared with this position.

The electric pump of this configuration is held by the intermediate case in a state in which the circuit board protrudes toward the lid case as compared to the position of the joint surface of the intermediate case with respect to the lid case.
Therefore, for example, even if the intermediate case holding the circuit board is gripped and flow soldering or dip coating is performed on the circuit board, the circuit board is closer to the lid case than the joint surface to the lid case. Therefore, there is little risk of molten solder or coating liquid adhering to the intermediate case.
Therefore, in the case of the electric pump of this configuration, when performing flow soldering or dip coating on the circuit board, the circuit board can be assembled to the intermediate case and then performed on the circuit board. It is easy to improve productivity by simplifying the handling of circuit boards.

  The second characteristic configuration of the present invention is configured such that each of a joining portion between the rotor-side case and the intermediate case and a joining portion between the lid case and the intermediate case join flat joining surfaces. The sealing member is provided at each of the joint portions.

  With this configuration, when providing the seal member at the joint portion, the seal member can be mounted so as to be sandwiched between flat joint surfaces, so that the joint portion joins curved joint surfaces. Compared with the case where it is configured, it is easy to manufacture the seal member, and it is easy to attach the seal member to the joint portion, so that the productivity can be further improved.

  According to a third characteristic configuration of the present invention, the intermediate case communicates a rotor side space formed by the intermediate case and the rotor side case, and a lid side space formed by the intermediate case and the cover case. It is in the point provided with the opening part to do.

Since the rotor-side case houses the rotating member including the impeller, the rotor-side space formed by the intermediate case and the rotor-side case is easily cooled by the water flow caused by the rotation of the impeller.
In addition, since the circuit board protrudes toward the lid case, the lid side space formed by the intermediate case and the lid case is easily heated by the heat generated by the electronic components connected to the circuit board.
Therefore, with this configuration, the lid-side space is cooled by air movement and heat conduction through the opening between the lid-side space and the rotor-side space to prevent malfunctions and early deterioration due to heating of electronic components. can do.

  A fourth characteristic configuration of the present invention resides in that a cylindrical portion into which an electronic component can be inserted and disposed is integrally formed in the intermediate case.

  If it is this structure, it will be easy to insert an electronic component in a cylindrical part, and to position and arrange it accurately. In addition, by placing electronic components that are relatively large and heavy in weight, such as capacitors, that are easily affected by vibration (rattle), in the cylindrical part, the connection posture of the electronic components can be stabilized and electronic The vibration resistance of the parts can be improved.

It is sectional drawing of an electric pump (electric brushless water pump). It is the side view which looked at the inside of the middle case from the lid case side. It is the side view which looked at the inside of an intermediate case from the motor housing side. It is a side view of an intermediate case. It is a top view of an intermediate case.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an electric brushless water pump A as an example of an electric pump according to the present invention that is installed in a vehicle engine (not shown) to circulate cooling water for cooling the engine.

  The electric brushless water pump A includes an aluminum alloy pump housing 2 in which the pump unit 1 is housed, an aluminum alloy motor housing 4 in which a motor unit 3 for driving the pump unit 1 is housed, and a stator of the motor unit 3. 3a includes a resin stator housing 5 insert-molded together with a coil 3c, a resin intermediate case 7 provided with a driver portion 6 for controlling the motor portion 3, and an aluminum alloy lid case 8. .

The pump housing 2 is formed with a suction port 2a for sucking cooling water from the engine, a discharge port 2b for sending cooling water to the engine, and an impeller chamber 2c in which the impeller 9 is accommodated.
Each of the inlet 2a and the outlet 2b communicates with the impeller chamber 2c.

Since the motor housing 4 is made of an aluminum alloy having high thermal conductivity, it is easy to radiate the heat generated in the motor unit 3 to the outside.
Inside the motor housing 4, there are provided a stator 3a around which a coil 3c is wound, a rotor 3b disposed on the radially inner side of the stator 3a, and a rotation support shaft 10 of the rotor 3b.

  From the opening 4b formed in the bottom wall portion 4a of the motor housing 4, a terminal 12 for making an electrical connection between the coil 3c of the stator 3a and the circuit board 11 for controlling energization to the stator 3a is provided as a driver portion. 6 protrudes to the side.

Inside the bottom wall portion 4 a of the motor housing 4, there is a cooling portion 13 in which an annular groove for allowing the cooling water flowing into the motor housing 4 from the impeller chamber 2 c to flow is formed concentrically with the rotary shaft 10. Is provided.
The cooling unit 13 cools the bottom wall portion 4a of the motor housing 4 by heat exchange with the cooling water flowing through the annular groove.

  The rotor 3b is integrally formed at one end of the resin-molded rotating member 14, and when the coil 3c is energized and a rotating magnetic field is generated in the stator 3a, the rotor 3b and the rotating member 14 rotate integrally around the rotating support shaft 10. To do.

  Due to the rotation of the rotating member 14, the impeller 9 formed at the other end of the rotating member 14 rotates so that cooling water is sucked into the impeller chamber 2c from the suction port 2a and cooled from the impeller chamber 2c to the discharge port 2b. Water is discharged.

The pump housing 2 and the motor housing 4 are fastened together by bolts 15 with the flange 5a of the stator housing 5 interposed therebetween.
Accordingly, the pump housing 2, the stator housing 5, and the motor housing 4 accommodate the rotating member 14 having the impeller 9 at one end and the rotor 3b at the other end, and the stator 3a provided around the rotating member 14. A rotor side case 16 is configured.

As shown in FIGS. 2 to 5, the intermediate case 7 includes an annular flange portion 7 a for bolt connection to the motor housing 4 and the lid case 8, and a circuit board 11 and a circuit board 11 constituting the driver portion 6. A pedestal portion 7b for holding an electronic component 18 such as an FET (field effect transistor) 18a or an electrolytic capacitor 18b connected to the connector, and a connector 7c for supplying power to the motor unit 3 or communicating with the driver unit 6 are integrated. Molded.
The terminal 12 is inserted into the pedestal portion 7b and extends to the lid case 8 side.

  The flange portion 7 a has a series of flat annular first joint surfaces 19 a that are joined to a series of flat annular housing joint surfaces 17 formed on the motor housing 4, and a series formed on the lid case 8. A flat annular second joining surface 19b is formed to be joined to the flat annular lid case joining surface 8a. The first joint surface 19a and the second joint surface 19b are formed in parallel to each other.

  Therefore, the rotor side case 16 and the lid case 8 are joined with the intermediate case 7 interposed therebetween, the first joint portion 20a between the rotor side case 16 and the intermediate case 7, and the second joint between the lid case 8 and the intermediate case 7. Each of the joining portions 20b is configured to join the flat joining surfaces 19a, 17, 19b, and 8a.

  A seal fitting groove 21a is formed in an annular shape on each of the first joint surface 19a and the second joint surface 19b, and a rubber ring 21 as a seal member is formed on each of the first joint portion 20a and the second joint portion 20b. It is fitted.

The pedestal portion 7 b is formed of a rotor side space (a space in which the pump unit 1 and the motor unit 3 are accommodated) 22 formed by the intermediate case 7 and the motor housing 4, an intermediate case 7 and a lid case 8. An opening 24 that communicates with the lid-side space (space in which the circuit board 11 is accommodated) 23 is formed.

On the side of the motor housing 4 of the opening 24, a heat radiating plate 25 that is in close contact with the bottom wall portion 4 a of the motor housing 4 is extended.
For this reason, the air heated by the driver unit 6 is cooled by contact with the bottom wall portion 4a of the motor housing 4 while circulating through the opening 24 over the rotor side space 22 and the lid side space 23, The temperature rise of the driver part 6 can be suppressed.

  A plurality of spacers 26 for positioning the circuit board 11 so as to protrude toward the lid case 8 compared to the position of the second bonding surface 19b are integrally formed on the surface facing the lid case 8 side of the pedestal portion 7b. The circuit board 11 is fixed to the front end surface of the spacer 26 with screws and spaced from the pedestal portion 7b to the lid case 8 side.

  As shown in FIG. 3, an FET mounting region 27 in which a plurality of FETs 18a are mounted and a plurality of electrolytic capacitors 18b are mounted on the surface of the pedestal portion 7b facing the motor housing 4 with the opening 24 interposed therebetween. A capacitor mounting area 28 is provided, and a cylindrical portion 29 into which the electronic component 18 can be inserted and disposed is integrally formed in each of the mounting areas 27 and 28.

In the FET mounting region 27, the FET 18a is inserted and disposed in a rectangular frame-shaped cylindrical portion 29a and fixed with an adhesive filled in a gap with the cylindrical portion 29a.
A plate-like heat radiating sheet material 30 is sandwiched between the FET 18 a fixed to the cylindrical portion 29 a and the bottom wall portion 4 a near the cooling portion 13 in the motor housing 4.
Therefore, the heat of the FET 18a can be thermally conducted to the bottom wall portion 4a through the heat radiating sheet material 30, and the FET 18a can be efficiently cooled.

  In the capacitor mounting region 28, the electrolytic capacitor 18b is inserted and disposed in the cylindrical portion 29b, and is fixed with an adhesive filled in a gap with the cylindrical portion 29b.

Connection terminals 31 of electronic components 18 such as FETs 18a and electrolytic capacitors 18b are inserted into the circuit board 11, and after these connection terminals 31 are electrically connected to the circuit board 11 by flow soldering, dip coating is performed. ing.
Flow soldering and dip coating are performed from the side of the circuit board 11 facing the lid case 8 by holding the intermediate case 7 holding the circuit board 11.

A U-shaped terminal 32 that electrically connects the circuit board 11 and the terminal 12 is embedded in the pedestal portion 7b by insert molding.
Various electronic components 18 (not shown) are connected to the circuit board 11 in addition to the FET 18a and the electrolytic capacitor 18b. The various electronic components 18 may be disposed directly on the circuit board 11 or may be provided with a main body on the pedestal portion 7b and connected to the circuit board 11 with a terminal member.

  In the present embodiment, the lid case 8 is not formed with an opening communicating with the outside for cooling the driver unit 6, and the connector 7 c is integrally formed with the intermediate case 7. Simplified and easy to improve waterproofness.

[Other Embodiments]
The electric pump according to the present invention may be an electric pump for cooling an inverter mounted on a vehicle, for example, in addition to the vehicle engine. Moreover, you may apply to the electric pump which circulates engine oil and ATF other than a cooling water as a fluid to circulate.

  The electric pump according to the present invention can be used in addition to a vehicle engine, for example, an electric pump for cooling an inverter mounted on a vehicle, or an electric pump for circulating engine oil or ATF in addition to cooling water as a circulating fluid. It is.

3a Stator 3b Rotor 7 Intermediate case 8 Lid case 9 Impeller 11 Circuit board 14 Rotating member 16 Rotor side case 18 Electronic component 19b Bonding surfaces 19a, 17, 19b, 8a of the intermediate case to the lid case Flat bonding surface 20a Rotor side case and Junction 20b with intermediate case Junction 21 between lid case and intermediate case Seal member 22 Rotor side space 23 Lid side space 24 Opening 29 Cylindrical part

Claims (4)

A rotor side case that houses an impeller at one end and a rotor provided with a rotor at the other end and a stator provided around the rotary member;
An intermediate case for holding a circuit board for energization control to the stator;
With a lid case,
The rotor side case and the lid case are joined across the intermediate case,
The electric pump which is hold | maintained at the said intermediate case in the state which the said circuit board protruded in the said cover case side compared with the position of the joint surface with respect to the said cover case of the said intermediate case. Each of the joint portion between the rotor side case and the intermediate case, and the joint portion between the lid case and the intermediate case are configured to join flat joint surfaces,
The electric pump according to claim 1, wherein a seal member is provided at each of the joint portions.   The intermediate case includes an opening that communicates a rotor side space formed by the intermediate case and the rotor side case and a lid side space formed by the intermediate case and the lid case. The electric pump according to 1 or 2.   The electric pump according to any one of claims 1 to 3, wherein a cylindrical portion into which an electronic component can be inserted and disposed is integrally formed in the intermediate case.

Images