JP2015229990A - Fluid device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid device capable of cooling a motor at low cost with high efficiency without using external power.SOLUTION: A fluid device comprises: an impeller 15; a compressor housing 17; a motor 27; and a transmission 13 increasing a revolving speed of the motor 27 and transmitting the increased revolving speed to a rotary shaft. The fluid device comprises: a cooling jacket 35 covering an outer circumference of the motor 27; and a case member 33 covering an outer circumference of the cooling jacket 35, a plurality of first concave grooves being formed in the outer circumference of the cooling jacket 35 along an axial direction of the motor 27. The fluid device comprises an intake channel 19 connecting one axial end portion of an air channel 53 defined between the first concave grooves and an inner circumferential surface of the case member 33 to an intake-side space of the compressor housing 17.

Description

  The present invention relates to a fluidic device.

As a turbocharger for a vehicle engine as a fluid device, a centrifugal supercharger that rotates and drives an impeller (rotary blade) is widely used. As this type of fluid device, for example, in a fuel cell vehicle, there is a supercharger that sends hydrogen as fuel, a blower that blows off moisture or water vapor generated by the reaction of hydrogen and oxygen, or an engine supercharger, etc. is there. These fluid devices drive a compressor with an electric motor, and are provided with a cooling means for the electric motor that rises in temperature during operation.
For example, Patent Literature 1 discloses an electric blower that connects a rotating blade to an electric motor and sucks and feeds air. This electric blower has a structure in which the electric motor is self-cooled by cooling air generated by driving the electric motor.
Further, Patent Document 2 discloses a supercharger that drives a compressor by increasing the rotation of an electric motor by a friction transmission. This supercharger is provided with a cooling jacket for cooling the motor by circulating cooling water outside the electric motor as a drive source.

JP-A-4-311700 JP 2004-156743 A

However, the electric blower of Patent Document 1 has a configuration in which a rotating blade dedicated to cooling is provided separately from a rotating blade for blowing air. Therefore, the rotor blades dedicated for cooling have a limited arrangement space, so that it is difficult to increase the air volume and it is difficult to efficiently cool the motor.
In addition, the supercharger of Patent Document 2 requires an external power such as a pump separately to circulate the cooling water through the cooling jacket, which increases the cost. In addition, since the coolant is cooling water, there is a concern of adversely affecting peripheral devices at the time of leakage.

  Accordingly, an object of the present invention is to provide a fluid device that can cool a motor at low cost and with high efficiency without using external power.

The present invention has the following configuration.
(1) an impeller attached to a rotating shaft;
A compressor housing in which the impeller is rotatably supported inside to define a suction side space and a compression side space;
A motor for rotationally driving the impeller;
A transmission that is provided between a drive shaft of the motor and a rotation shaft of the impeller, and that accelerates rotation of the motor and transmits the rotation to the rotation shaft;
A fluidic device comprising:
A cooling jacket that covers the outer periphery of the motor, and a case member that covers the outer periphery of the cooling jacket,
A plurality of first concave grooves are formed on the outer periphery of the cooling jacket along the axial direction of the motor,
An intake passage for connecting one axial end of an air passage defined between the first concave groove and the inner peripheral surface of the case member to the suction-side space of the compressor housing; Feature fluidic device.
(2) The fluid device according to (1), wherein a second concave groove is formed along an axial direction of the motor on an inner periphery of the case member.
(3) The fluid device according to (1) or (2), wherein the intake flow path communicates with a gap space between a rotor and a stator of the motor.

According to the fluid device of the present invention, the motor can be cooled at low cost and with high efficiency without using external power.
Further, according to the fluid device of the present invention, the second concave groove is formed on the inner periphery of the case member, whereby the flow rate of the air flow path can be increased and the cooling efficiency can be further improved.
Further, according to the fluid device of the present invention, the intake flow path is also communicated with the gap space between the rotor and the stator, so that the portion close to the heat source of the motor can be cooled, and the cooling efficiency can be further improved. it can.

It is a figure for demonstrating embodiment of this invention, and is a whole figure of a supercharging system. It is an A direction arrow directional view of the supercharging system shown in FIG. It is BB sectional drawing of the supercharging system shown in FIG. It is a disassembled perspective view of a supercharging system. It is CC sectional drawing of the supercharging system shown in FIG. FIG. 6 is an enlarged view of a portion D in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, it demonstrates using a supercharging system provided with a self-cooling mechanism as a fluid apparatus.
FIG. 1 is a diagram for explaining an embodiment of the present invention, and is an overall view of the supercharging system, FIG. 2 is a view in the direction of arrow A of the supercharging system shown in FIG. 1, and FIG. FIG. 4 is an exploded perspective view of the supercharging system.

  As shown in FIGS. 1 to 4, the supercharging system 100 of this configuration mainly includes a motor unit 11, a friction roller type transmission 13, an impeller 15 (see FIG. 3), a spiral pipe 17, an intake air flow. Road 19 is provided. The supercharging system 100 of this configuration accelerates the rotation of the motor by the action of the friction roller type transmission 13 and transmits it to the impeller 15, and drives the impeller 15 to rotate at high speed to blow a large volume of air to the outside. . Further, the motor is cooled by sucking outside air through a plurality of air circulation paths provided along the motor shaft direction on the outer peripheral portion of the motor unit 11 by the rotation of the impeller 15.

  As shown in FIG. 3, the motor unit 11 has a cylindrical shape as a whole. As shown in FIG. 3, the motor unit 11 has a front cover 21 provided at one end portion in the motor axial direction (right direction in the drawing) and the other end portion opposite to the one end portion. The rear cover 23 provided, a drive shaft 25 rotatably supported by the front cover 21 and the center support portions 21a and 23a of the rear cover 23, and a motor unit 27 that rotationally drives the drive shaft 25 are provided. The motor unit 27 includes a rotor 29 integrated with the drive shaft 25 and a stator 31 provided on the outer periphery of the rotor 29.

  The outer periphery of the motor unit 11 is covered with a motor case 33 that is a cylindrical case member, and a cylindrical cooling jacket 35 is disposed on the inner periphery of the motor case 33. A stator 31 of the motor unit 27 is fixed to the inner peripheral surface of the cooling jacket 35. Although other members may be interposed between the stator 31 and the cooling jacket 35, it is preferable to dispose the cooling jacket 35 at a position close to the heat source of the motor unit 27 from the viewpoint of motor cooling. .

  As the material of the cooling jacket 35, aluminum, copper, iron-based metal materials having high thermal conductivity, or resin materials having high thermal conductivity can be used.

  The drive shaft 25 of the motor unit 11 is connected to a rotation input side coupling member 37 (details will be described later) of the friction roller type transmission 13, and the impeller 15 is attached to the rotation output shaft 39 of the friction roller type transmission 13. It has been.

  The impeller 15 is rotatably supported inside the spiral tube 17. The spiral tube 17 is a compressor housing in which an intake chamber 41 serving as a suction side space and a supercharging passage 43 serving as a compression side space are defined.

  A connection pipe 45 serving as an intake flow path is connected to the intake chamber 41 of the spiral pipe 17. The connecting pipe 45 is connected to the front cover 21 connected to the motor unit 11 over the entire circumference and is connected to an intake duct 49 in which an annular space 47 serving as an air flow path is formed.

  The front cover 21 is formed with an annular air channel 51 that communicates with the space 47 in the intake duct 49 over the entire circumference. The space 47 is formed in a spiral shape in which the flow path cross-sectional area gradually increases along the circumferential direction of the annular air flow path 51, and has a structure with less flow path resistance.

  The annular air flow path 51 of the front cover 21 is connected to one axial end of the air flow path 53 defined between the cooling jacket 35 and the motor case 33, and the other axial end of the air flow path 53 is The air is released through the rear cover 23 and the intake hood 55 attached to the rear cover 23.

  The friction roller transmission 13 includes a rotation input-side connecting member 37, an annular roller 61, a plurality of intermediate rollers 63, a carrier 67 that rotatably supports the plurality of intermediate rollers 63, and a rotation output shaft (sun Axis) 39. The connecting member 37 is connected to the annular roller 61 and rotates integrally with the drive shaft 25. The plurality of intermediate rollers 63 are disposed in an annular space between the inner peripheral surface of the annular roller 61 and the outer peripheral surface of the rotation output shaft 39.

  These intermediate rollers 63 are pivotally supported by the carrier 67 so as to be equally arranged along the circumferential direction around the rotation output shaft 39, and are arranged on the inner peripheral surface of the annular roller 61 and the outer peripheral surface of the rotation output shaft 39. Rolling contact.

  When the drive shaft 25 is rotationally driven, the rotational torque is transmitted to the annular roller 61 via the connecting member 37, and the annular roller 61 is rotationally driven. When the annular roller 61 rotates, the intermediate roller 63 rolls to contact and rotates and revolves around the rotation output shaft 39. Thereby, the rotational torque of the annular roller 61 is transmitted to the rotation output shaft 39 via the intermediate roller 63. In this configuration, the rotation of the drive shaft 25 is increased by each roller and transmitted to the rotation output shaft 39.

  The details of the friction roller transmission 13 are described in, for example, Japanese Patent Application Laid-Open No. 2004-156931, Japanese Patent Application Laid-Open No. 2014-40892, and the like, and should be referred to as necessary.

  According to the supercharging system 100 configured as described above, when the drive shaft 25 is rotationally driven by the motor unit 27, the rotation is accelerated by the friction roller transmission 13, and the impeller 15 is rotationally driven at a speed higher than the motor rotational speed. The Due to the rotation of the impeller 15, the intake chamber 41 of the spiral tube 17 becomes negative pressure, and outside air is taken in through the connection tube 45 and the intake duct 49. At this time, outside air is taken into the annular space 47 inside the intake duct 49 from the intake hood 55 through the air flow path 53 of the motor unit 11. The air flowing through the air flow path 53 serves as a cooling medium to cool the motor unit 27.

Next, the air flow path 53 of the motor unit 11 will be described in detail.
5 is a cross-sectional view taken along the line C-C of the supercharging system 100 shown in FIG. 1, and FIG. 6 is an enlarged view of a portion D in FIG.
As described above, the cooling jacket 35 is a cylindrical member that covers the outer periphery of the motor unit 27 (in this configuration example, the outer periphery of the stator 31). (First concave groove) 71 is formed.

  The jacket-side concave grooves 71 are formed at equal intervals over the entire circumference of the cooling jacket 35 and are blocked by the inner peripheral surface of the motor case 33 arranged to cover the outer periphery of the cooling jacket 35, thereby defining the air flow path 53 </ b> A. Made. In the illustrated example, the jacket-side concave groove 71 has a rectangular axial cross section, but a trapezoidal shape or a polygonal shape in which the circumferential groove width increases as the groove depth increases, or a triangular shape in which the circumferential groove width decreases, or Any shape such as a curved surface shape may be used. The jacket-side recessed groove 71 is preferable because the heat exchange efficiency increases as the area of the groove inner surface such as the groove wall surface or the groove bottom surface increases. Further, by forming the cooling jacket 35 at equal intervals over the entire circumference, the motor unit 27 can be evenly cooled and temperature unevenness in the motor can be prevented.

  According to the supercharging system 100, the motor unit 11 is provided with the air flow path 53 </ b> A, and the air flow path 53 </ b> A is connected to the intake chamber 41, whereby the outside air is sucked through the air flow path 53 </ b> A by the rotation of the impeller 15. . The sucked air is compressed and supplied to the supercharging passage 43. Therefore, in order to take in the air supplied to the supercharging passage 43 through the air passage 53A, the motor portion 27 continues to be cooled during the operation of the motor portion 27. In addition, the cooling of the motor unit 27 can be achieved at low cost without newly providing a cooling device for lubricating the cooling medium. And in this structure, since a cooling medium is air, even if leakage of a cooling medium arises, it will have no influence on a peripheral device.

  Further, since the jacket-side groove 71 is formed in parallel with the motor axial direction, the flow resistance when air flows from the rear cover 23 side to the front cover 21 side (see FIG. 3) is reduced, and the efficiency is improved. A large flow rate of air can be made to flow. If the jacket-side concave groove 71 is formed in a spiral shape so as to be inclined from the motor axis direction, the groove formation rate per unit area on the outer periphery of the cooling jacket 35 increases, and the flowing air blows to the groove wall surface. Since it is applied, the heat dissipation effect can be enhanced.

  The motor case 33 has a cylindrical groove on the inner peripheral surface of the motor case 33 in order to close the groove upper portion of the jacket-side concave groove 71. (Concave groove) 73 may be formed. In that case, an air flow path 53B having a larger cross-sectional area than the air flow path 53A formed by each jacket-side concave groove 71 can be defined.

  The circumferential groove width of the case-side recessed groove 73 is longer than the circumferential arrangement pitch of the jacket-side recessed grooves 71 so that the air flow paths 53A of the plurality of jacket-side recessed grooves 71 are combined into one air flow path 53B. The flow resistance of the flowing air can be further reduced. Moreover, since the flow rate of the flowing air can be increased, the heat dissipation effect can be enhanced.

  The case-side groove 73 is not limited to being formed in parallel with the motor shaft direction, and may be formed in the circumferential direction. In that case, the surface area of the air channel can be increased, and the heat dissipation effect is enhanced. Moreover, since the air flow paths 53A by the jacket-side concave grooves 71 adjacent in the circumferential direction communicate with each other, the flowing air can be stirred in the circumferential direction, and a local temperature rise can be suppressed.

  Further, the case-side concave grooves 73 are also formed at equal intervals over the entire circumference of the inner peripheral surface of the motor case 33, so that the motor unit 27 can be evenly cooled. In areas such as the upper part in the vertical direction of the motor unit 27 where heat is likely to be trapped, the cooling density is distributed by increasing the arrangement density of the jacket side grooves 71 and the case side grooves 73 compared to other areas. May be. In that case, cooling according to the actual temperature change of the motor unit 27 can be performed, and cooling can be performed more evenly.

  The parameters such as the groove width, groove depth, groove cross-sectional shape, groove number, groove arrangement density, groove length in the motor axial direction of the jacket side groove 71 and case side groove 73 are determined by the supercharging system 100. It can be set to an optimal value depending on the size and operating conditions.

  Further, the air flow path 53 in the motor unit 11 is not limited to the air flow paths 53A and 53B defined between the cooling jacket 35 and the motor case 33, but between the rotor 29 of the motor unit 27 and the stator 31. The gap space can also be used.

  In that case, a communication path (not shown) that communicates the clearance space between the rotor 29 and the stator 31 and the annular air flow path 51 of the front cover 21 is provided. By passing the cooling air through the communication path into the gap space between the rotor 29 and the stator 31, the portion closer to the heat source of the motor unit 27 can be cooled, and the cooling efficiency of the motor can be further improved.

  As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make changes and applications based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. This is also the scope of the present invention, and is included in the scope of seeking protection.

  The cooling jacket 35 and the motor case 33 are not limited to a cylindrical body, and may be a form in which block bodies divided in the circumferential direction are combined, or a form provided discretely only in a part in the circumferential direction. It may be.

  The supercharging system 100 described above can be applied to a supercharger that sends in hydrogen as fuel for a fuel cell vehicle, a blower that blows off moisture or water vapor generated by the reaction of hydrogen and oxygen, or an engine supercharger. It is. By using the supercharging system 100 having this configuration, the motor can be cooled at a low cost and with high efficiency, and the product performance can be stably maintained.

11 Motor unit 13 Friction roller type transmission (transmission)
15 Impeller 17 Spiral tube (compressor housing)
DESCRIPTION OF SYMBOLS 19 Intake flow path 25 Drive shaft 27 Motor part 29 Rotor 31 Stator 33 Motor case (case member)
35 Cooling jacket 41 Intake chamber (intake side space)
45 Connection pipe (intake flow path)
53 Air flow path 53A Air flow path 53B Air flow path 71 Jacket side groove (first groove)
73 Case side ditch (second ditch)
100 Supercharging system (fluid device)

Claims (3)

An impeller attached to a rotating shaft;
A compressor housing in which the impeller is rotatably supported inside to define a suction side space and a compression side space;
A motor for rotationally driving the impeller;
A transmission that is provided between a drive shaft of the motor and a rotation shaft of the impeller, and that accelerates rotation of the motor and transmits the rotation to the rotation shaft;
A fluidic device comprising:
A cooling jacket that covers the outer periphery of the motor, and a case member that covers the outer periphery of the cooling jacket,
A plurality of first concave grooves are formed on the outer periphery of the cooling jacket along the axial direction of the motor,
An intake passage for connecting one axial end of an air passage defined between the first concave groove and the inner peripheral surface of the case member to the suction-side space of the compressor housing; Feature fluidic device.   The fluid device according to claim 1, wherein a second concave groove is formed along an axial direction of the motor on an inner periphery of the case member. The fluid device according to claim 1, wherein the intake passage communicates with a gap space between a rotor and a stator of the motor.

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