JP6442250B2 - Brushless motor integrated pump - Google Patents

Description

  The present invention includes a rotary pump for pumping a working medium of a waste heat recovery system such as a Rankine cycle, a motor for sharing the rotary pump and a rotary shaft, and adding a driving force to the rotary pump. The present invention relates to a brushless motor-integrated pump integrally having

  In recent years, there is a need for a brushless motor-integrated pump capable of realizing high efficiency and high durability as a structure that integrates a pump with a brushless motor and shares a rotating shaft to pump the working medium of a waste heat recovery system. It has been.

  Conventionally, a brushless motor having a stator and a rotor has a problem in that the coil provided in the stator generates heat during its operation, thereby increasing the coil resistance and requiring an extra current, thereby reducing the efficiency.

  On the other hand, when changing specifications to avoid heat loss (for example, increasing the size), extra weight, size, and cost may be required, and a coil cooling method that can avoid this is desired. It was rare.

  Therefore, for example, as shown in JP-A-2002-165411 (Patent Document 1), a coolant passage is provided on the outer periphery of the coil formed on the outer periphery of the stator core, and the coil provided as the stator of the motor (or the generator) On the other hand, an invention that enables cooling by circulating a coolant around the periphery is known.

  In the invention described in Patent Document 1, the stator side and the rotor side are separated from each other by the partition wall, and the cooling liquid is circulated only to the stator side, thereby cooling the coil without affecting the rotor side that is rotationally driven. Is possible.

  Furthermore, for example, as disclosed in Japanese Patent Application Laid-Open No. 2009-19522 (Patent Document 2), an electric pump integrally provided with an electric motor is also known. The electric pump described in Patent Document 2 is hermetically sealed. An electric pump provided with an electric motor, a discharge part, and a suction part provided in a mold housing, further comprising a cooling liquid lead-out means having a lead-in path and a lead-out path, and leading out from the inside of the coolant housing. It is an electric pump characterized by this.

  In the invention described in Patent Document 2, the liquid pressurized by the pump is introduced into a motor having a stator and a rotor, whereby lubrication of bearings attached to the motor shaft and stator and rotor in the motor are performed. As in the embodiments shown in the specification and drawings, the pump uses an internal gear type pump which is an existing type, thereby suppressing a decrease in pump efficiency and an efficient motor. It is possible to provide a cooling structure.

  However, the invention described in Patent Document 2 cools the coil by circulating the liquid so that it passes through both the stator and the rotor. However, when the liquid passes through the motor, the resistance of the liquid The rotation of the rotor is hindered, and as a result, efficiency may be reduced.

  Therefore, there is a need for a brushless motor-integrated pump having a structure that does not hinder the rotation of the rotor while allowing the coil to be cooled by liquid.

  Further, in the brushless motor-integrated pump that pumps the working medium of the waste heat recovery system as described above, the efficiency of the waste heat recovery system is improved by heating the working medium by heat exchange from the coil. A device that can suppress the coil temperature has been particularly desired.

JP 2002-165411 A JP 2009-19522 A

  It is an object of the present invention to provide a brushless motor-integrated pump capable of realizing high efficiency, high durability, and downsizing for pumping a working medium of a waste heat recovery system.

  In order to solve the above problems, the present invention is directed to a case where a working medium of a waste heat recovery system is introduced from a suction port provided in the pump cover into a case body including a pump cover, a motor cover, and a motor case. A rotary pump for circulating the working medium to a discharge port provided in the motor case via a connection port provided in the motor case, and a brushless motor sharing a rotary shaft with the rotary pump. A rectifying member connected to the connection port is provided inside, and a control device for controlling the rotation speed of the brushless motor is arranged outside the case body.

  In the present invention, the brushless motor includes a stator, a rotor, and the rotating shaft, the stator includes a stator core and a coil, and at least a part of an end surface of the stator core is fixed to a step portion of the motor case. Yes.

  Further, the rotor is a substantially cylindrical rotor core that is pivotally attached to the rotating shaft, a magnet that is fitted to the rotor core, and a substantially disk-shaped rotor that is fixed so as to cover both end surfaces of the rotor core in the axial direction. It consists of a cover.

  In particular, the rotor core according to the present invention is preferably provided with a plurality of through-holes penetrating both axial end faces in the axial object because weight reduction and cost saving can be expected.

  According to the present invention, when the brushless motor is driven by the control device, the rotary pump sharing the rotary shaft is operated in synchronization, and the operation is performed by the negative pressure generated in the low pressure portion of the rotary pump from the suction port. A medium is introduced into the pump cover, and at the same time, the working medium is pumped from the connection port by the pressure generated in the high pressure portion of the rotary pump, and the flow direction is the same as the rotation direction of the rotor by the rectifying member. The end face of the stator core is fixed to the step portion of the motor case, and the rotor core is covered with both end faces in the axial direction by the rotor cover. Since it passes through the space around the coil and is discharged from the discharge port provided in the motor case, In addition to the fact that the effect of inhibiting the rotation of the rotor from being hindered by the resistance force of the liquid can be expected, since the control device is arranged outside the case body, the control device is in contact with the working medium. It is possible to avoid submerged damage caused by.

  Therefore, the present invention improves the efficiency of the whole waste heat recovery system by heating the working medium by exchanging heat generated from the coil to the working medium of the waste heat recovery system, compared with the motor of the same specification, The motor efficiency is improved by suppressing the heat loss due to the suppression of heat generation, and the load due to the drag force such as the friction of the bearing part and the pressure received from the working medium is reduced by rectifying and circulating the working medium in the motor. Thus, there is an effect of improving the durability and reducing the size by sharing the rotary pump and the rotary shaft and configuring the case body integrally therewith.

The longitudinal cross-sectional view of the brushless motor integrated pump in preferable embodiment of this invention. It is a figure which shows the baffle member in embodiment shown in FIG. 1, (a) is a top view of a baffle member, (b) is a longitudinal cross-sectional view of the AA surface of the baffle member shown to (a). Explanatory drawing which shows the location of the flow of the working medium in embodiment shown in FIG. 1, and the cross-sectional view shown to FIG. FIG. 4 is a cross-sectional view of the AA plane in the explanatory view shown in FIG. 3. FIG. 4 is a cross-sectional view of the BB plane in the explanatory view shown in FIG. 3. FIG. 4 is a cross-sectional view of the CC plane in the explanatory view shown in FIG. 3.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 shows a brushless motor-integrated pump according to a preferred embodiment of the present invention, and a suction port provided in the pump cover 2 in a case body 1 comprising a pump cover 2, a motor cover 3, and a motor case 4. A rotary pump 5 for introducing the working medium 10 from 21 and circulating the working medium 10 to a discharge port 41 provided in the motor case 4 via a connection port 31 provided in the motor cover 3; The case body includes a brushless motor 7 sharing the rotary pump 5 and the rotary shaft 6, and includes a rectifying member 8 installed between the motor cover 3 and the motor case 4 and connected to the connection port 31. A control device 9 for controlling the rotational speed of the brushless motor 7 is disposed outside the motor 1.

  The brushless motor 7 includes a stator 71, a rotor 72, and the rotating shaft 6 supported by a bush 61. The stator 71 includes a stator core 711 and a coil 712, and is wound around a notch 713 of the stator core 711. A space outside the coil 712 in the notch 713 of the coil 712 serves as a working medium passage 714 through which the working medium 10 passes.

  In addition, at least a part of the end surface of the stator core 711 is fixed to the step portion 42 of the motor case 4, and the working medium 10 does not pass through the gap between the outer peripheral surface of the stator core 711 and the step portion 42. Even if it passes, it is a small amount compared with the flow rate passing through the working medium passage 714.

  The rotor 72 has a substantially cylindrical rotor core 721 attached to the rotary shaft 6, a magnet 722 fitted to the rotor core 721, and a substantially fixed shape so as to cover both end surfaces of the rotor core 721 in the axial direction. It consists of disk-shaped rotor covers 724 and 724.

  The rotor core 721 is particularly preferably provided with a plurality of through-holes 723 penetrating through both end faces in the axial direction on the object of the shaft because weight reduction and cost saving can be expected.

  Even in that case, since the rotor covers 724 and 724 are fixed to the rotor core 721 so as to cover both end faces in the axial direction, the working medium 10 does not pass through the through hole 723. Therefore, problems such as generation of unnecessary turbulence and generation of bubbles can be avoided.

  The brushless motor-integrated pump according to the present embodiment includes a power supply (not shown) that supplies current to the coil 712 of the stator 71 of the brushless motor 7 and the brushless outside the case body 1 that is configured to be liquid-tight. Since the control device 9 for controlling the number of rotations of the rotor 72 of the motor 7 is disposed, it is possible to avoid troubles such as submerging in the working medium 10 filling the case body 1 and damaging each component. can do.

  2A and 2B are diagrams showing the rectifying member 8 in the embodiment shown in FIG. 1, wherein FIG. 2A is a plan view of the rectifying member 8, and FIG. 2B is an AA plane of the rectifying member 8 shown in FIG. FIG.

  The rectifying member 8 includes a bottom wall 81 positioned on the bottom surface, an insertion hole 82 through which the rotary shaft 6 is inserted, and a partition erected so as to connect two points of the bottom wall 81 along the outer periphery of the insertion hole 82. A wall 83 and an outer peripheral wall 84 positioned on the outer periphery of the bottom wall 81, and one or a plurality of positions of the outer peripheral wall 84 are lower than the other outer peripheral walls 84 within the height of the bottom wall 81. For this purpose, the outlet 85 is formed.

  In the present embodiment, the rectifying member 8 has only one outlet 85, but a plurality of outlets that can adjust the flow so as to be in the same direction as the rotation direction of the rotor 72 are formed. You may do it.

  FIG. 3 is an explanatory diagram showing the flow of the working medium 10 in the embodiment shown in FIG. 1 and the locations of the cross-sectional views shown in FIGS.

  As shown in FIG. 3, when the brushless motor 7 is driven, the working medium 10 operates in synchronism with the rotary pump 5 sharing the rotary shaft 6, and the low-pressure portion of the rotary pump 5 passes through the suction port 21. It is introduced into the pump cover 2 constituting the case body 1 by the negative pressure generated, and is pumped to the connection port 31 by the pressure generated by the high pressure portion of the rotary pump 5. Then, the flow is adjusted in the same direction as the rotation direction of the rotor 72 by the rectifying member 8 installed in the motor case 4 and connected to the connection port 31, and introduced from the outlet 85 into the motor case 4. Is done.

  At this time, as a matter of course, a plurality of outlets that can adjust the flow so as to be in the same direction as the rotation direction of the rotor 72 may be formed in the rectifying member 8 as described above.

  Then, the working medium 10 introduced into the motor case 4 from the outlet 85 has a structure that does not pass through the gap between the outer peripheral surface of the stator core 711 and the step 42 as described above, or the working medium passage 714 even if it passes. Since the flow rate is smaller than the flow rate passing through the rotor core 721 and does not pass through the interior of the rotor core 721, the entire amount or most of the flow is guided through the working medium passage 714 of the stator core 711. .

  Therefore, the working medium 10 mainly exchanges heat while being in contact with the coil 712 that is a heating element in the working medium passage 714 and then flows out from the discharge port 41 provided in the motor case 4. By suppressing the heat generation of the coil 712, it is possible to improve motor efficiency by suppressing heat loss.

  At this time, since the flow direction of the working medium 10 is adjusted by the rectifying member 8 and is the same as the rotation direction of the rotor 72, it is possible to suppress the influence on the rotation of the rotor 72. As a result, the working medium is rectified and circulated into the motor case 4 in this way, thereby improving the durability by reducing the load due to the drag of the bearing portion and the pressure received from the working medium. be able to.

  The working medium 10 flowing out from the discharge port 41 is then sent to a waste heat recovery system (not shown) such as a conventionally known Rankine cycle, which is a heating element as described above. By exchanging heat while being in contact with the coil 712, the temperature is increased due to heating compared to when it is introduced from the suction port 21.

  By heating the working medium, the amount of heat required when the working medium is further heated by the waste heat recovery system is reduced, and as a result, the efficiency of the waste heat recovery system can be increased.

  4 is a cross-sectional view of the AA plane in the explanatory diagram of FIG.

  As shown in FIG. 4, the outer periphery of the stator core 711 and the inner peripheral surface of the motor case 4 are substantially in close contact with each other, and the stator core 711 is fixed to the motor case 4 by an arbitrary fixing means.

  The rotor core 721 is fixed to the rotating shaft 6 by an arbitrary fixing means, and the rotor 72 rotates integrally with the rotating shaft 6.

  5 is a cross-sectional view of the BB plane in the explanatory view of FIG.

  As shown in FIG. 5, a rotor cover 724 (724) is fixed to the rotor core 721 so as to cover both end faces in the axial direction. Even if the rotor core 721 is provided with a through hole 723, the through hole Since the working medium 10 does not pass through 723, problems such as generation of unnecessary turbulent flow and generation of bubbles can be avoided.

  6 is a cross-sectional view of the CC plane in the explanatory view of FIG.

  As shown in FIG. 6, the working medium 10, whose flow is adjusted by the rectifying member 8 in the same direction as the rotation direction of the rotor 72 and introduced into the motor case 4 from the outlet 85, operates the stator core 711. Guided through media path 714.

  DESCRIPTION OF SYMBOLS 1 Case body, 2 Pump cover, 3 Motor cover, 4 Motor case, 5 Rotary pump, 6 Rotating shaft, 7 Brushless motor, 8 Rectification member, 9 Control apparatus, 10 Working medium, 21 Intake port, 31 Connection port, 41 Discharge Exit, 42 Stepped portion, 51 External gear, 52 Internal gear, 53 Side plate, 61 Bush, 71 Stator, 72 Rotor, 711 Stator core, 712 Coil, 713 Notch, 714 Working medium passage, 721 Rotor core, 722 Magnet, 723 Through hole 724 rotor cover, 81 bottom wall, 82 insertion hole, 83 partition wall, 84 outer peripheral wall, 85 outlet

Claims (6)

A rotor pivotally attached to the rotating shaft of the brushless motor and a stator disposed around the rotor are housed in a motor case constituting a part of the case body, and the opening of the motor case A rotary pump that is covered with a motor cover that penetrates and protrudes the rotary shaft, and that shares the rotary shaft of the brushless motor in a pump cover that is installed on the surface of the motor cover and forms a case body together with the motor case The brushless motor is controlled by a control device installed outside the case body, and the working medium introduced from the suction port provided in the pump cover is connected via a connection port formed in the motor cover. It is introduced from the connection port by the rectifying member disposed above the inner motor casing after introduction into the motor case Te A brushless motor-mounted pump for discharging the discharge direction from the discharge port formed in the motor case through the adjustment to the working medium passages in the same direction as the rotation direction of the brushless motor of the dynamic medium, wherein the rectifying member to the bottom surface A bottom wall that is positioned, an insertion hole through which the rotation shaft is inserted, a partition wall that is erected so as to connect two points of the bottom wall along an outer periphery of the insertion hole, and an outer peripheral wall that is positioned on the outer periphery of the bottom wall The brushless motor-integrated pump according to claim 1, wherein one or a plurality of locations of the outer peripheral wall are formed in a shape that is lower than other outer peripheral walls with the height of the bottom wall as a limit .   2. The brushless motor-integrated pump according to claim 1, wherein the stator includes a stator core and a coil, and the working medium passes around the coil attached to the notch portion of the stator core as a working medium passage.   The brushless motor-integrated pump according to claim 1 or 2, wherein the rotor includes a rotor core, a magnet, and a rotor cover, and both end faces of the rotor core are covered and fixed by the rotor cover.   The stator has a structure in which at least a part is fixed inside the case body to be in close contact, and the working medium does not pass through the stator in the discharge port direction except for the working medium passage. Item 4. The brushless motor integrated pump according to Item 2 or 3.   The stator is at least partially fixed inside the case body, and the flow rate of the working medium passing in the direction of the discharge port between the stator and the case body except for the working medium passage is the working medium. 4. The brushless motor-integrated pump according to claim 2, wherein the flow rate is smaller than a flow rate of the working medium passing through the passage. The brushless motor-integrated pump according to claim 1, 2, 3, 4, or 5, wherein the rotary pump is an internal gear pump.

Images