JP2009114906A - Self-cooling structure of axial-flow fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently radiating heat of an electronic component mounted on a substrate and generating large heat, and to suppress a temperature rise, in a circuit board driving a motor in a centrifugal fan motor. <P>SOLUTION: In the centrifugal fan motor, an impeller mounted to a rotor of the motor rotates about a center shaft, and the impeller is stored in a housing made from a casing or a cover. By rotations of the impeller, air is sucked from an intake port, and sent out from a discharging port through a ventilating passage. A guide wall ranging from a casing side wall inner surface facing the ventilating passage of the centrifugal fan motor close to the electronic part mounted on the circuit board arranged between the motor and the casing side wall inner surface so as to be electrically connected with the motor, is arranged integrally with the casing. Therefore, a part of air passing through the ventilating passage flows near the electronic component, thereby suppressing the temperature rise of the electronic component generating large heat. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric centrifugal fan motor used for blowing air.

  Conventionally, centrifugal fan motors that have a cochlear casing, and that suck in the axial direction and exhaust in the radial direction, have been designed in various ways to suppress the performance degradation caused by the temperature rise of motors and electronic parts that generate large amounts of heat. Has been made.

For example, in Patent Document 1, the inner peripheral surface of the annular protrusion formed toward the impeller side from the side plate of the casing opposite to the suction port adjacent to the impeller is set as an inclined surface, so that the control circuit unit A centrifugal fan motor that promotes cooling is disclosed. Moreover, in patent document 2, by lowering a part of the annular projection formed toward the impeller side from the side plate of the casing opposite to the suction port adjacent to the impeller, the air flow from there enters and exits. In addition, a technique intended to cool a motor or an electronic component that generates a large amount of heat is disclosed.
JP 2006-207519 A JP 2007-126976 A

  However, recent centrifugal fan motors have been increasing their output due to demands for high airflow and high static pressure, and as the current input to the motor increases, the temperature rise of electronic components that generate large heat has become a problem. However, it is still a challenge to cool it strongly.

  Although both the centrifugal fan motors of Patent Document 1 and Patent Document 2 can promote the flow of air in and out of the vicinity of the electronic component as compared with the conventional fan, both are slower than the air flow flowing through the ventilation path. Since this method uses an air flow flowing through the gap between the impeller and the casing, if the temperature rise of the electronic component having a large casing heat generation is significant, a cooling effect higher than expected cannot be obtained.

  The present invention has been made in view of the above problems, and has an object to efficiently cool an electronic component and suppress an increase in temperature.

  A centrifugal fan motor according to the invention of claim 1 is a cochlear casing, a motor built in the casing, a circuit board for driving the motor, and a control circuit comprising electronic components mounted thereon, An impeller integrally held by the rotor of the motor, and a guide wall that extends from an air passage in the casing toward the electronic component generating a large amount of heat on the circuit board at a position near the outer edge of the circuit board on the side wall of the casing. Is provided.

  A centrifugal fan motor according to a second aspect of the present invention is the centrifugal fan motor according to the first aspect, wherein aluminum or copper or a A plate-like heat radiation plate made of these alloys is provided, and an electronic component generating a large amount of heat is in contact with a heat-conductive rubber-like, gel-like, or sheet-like member.

  A centrifugal fan motor according to the invention described in claim 3 is a cochlear casing, a motor built in the casing, a circuit board for driving the motor, and a control circuit comprising electronic components mounted on the circuit board, A plate-like heat sink made of aluminum, copper, or an alloy thereof on the surface of the casing side wall facing the electronic component that generates a large amount of heat; And a heat-generating electronic component that is in contact with a heat-conductive rubber-like, gel-like, or sheet-like member, and the heat radiating plate continues to the ventilation path of the cochlear casing.

  A centrifugal fan motor according to a fourth aspect of the present invention is a cochlear casing, a motor built in the casing, a circuit board for driving the motor, and a control circuit comprising electronic components mounted thereon, An impeller that is integrally held by the rotor of the motor, the circuit board is extended in a direction away from the central axis of the impeller, and a large heat generating electronic component mounted on the impeller side surface of the board is It arrange | positions so that the ventilation path inside a cochlear casing may be faced.

  A centrifugal fan motor according to a fifth aspect of the present invention is the centrifugal fan motor according to the fourth aspect, wherein the centrifugal fan motor is generated by an electronic component mounted on a circuit board facing a ventilation path inside a cochlear casing. The uneven surface is filled with a resin such as a silicon potting material or a rubber-like member to smooth the surface of the circuit board.

  A centrifugal fan motor according to a sixth aspect of the present invention is the centrifugal fan motor according to the fourth aspect, wherein the centrifugal fan motor is mounted on the impeller side surface of the circuit board facing the ventilation path inside the cochlear casing. A plate-like heat radiation plate made of aluminum, copper, or an alloy thereof, which is in contact with a highly heat-conductive rubber-like or gel-like, or sheet-like member, is provided on an electronic component that generates large amounts of heat.

  In the present invention, it is possible to suppress an increase in the temperature of electronic components that generate large amounts of heat. In particular, the inventions according to claims 2, 3, and 6 using a heat sink made of aluminum, copper, or an alloy thereof are more effective for heat dissipation of electronic components that generate larger heat than other inventions that do not include the heat sink.

  FIG. 1 is a diagram showing a configuration of a centrifugal fan motor 1 according to a first embodiment of the present invention, and shows a longitudinal section cut by a plane including a central axis J1. FIG. 2 is an exploded perspective view showing the main configuration of the centrifugal fan motor 1. As shown in FIG. 1, the centrifugal fan motor 1 includes a motor 6 built in the impeller 1 around the central axis J <b> 1, and the impeller 1 and the motor 6 are housed in a casing 2. Further, by attaching the cover 3 having the intake port 4 to the casing 2, an air passage 9 is formed, and air is taken into the impeller 1 by the rotation of the impeller 1 and is generated by the rotation of the impeller 1. The air flow is adjusted in the ventilation path 4 constituted by the casing 2 and the cover 3, and air is blown out from the discharge port 5. The centrifugal fan motor 1 is used, for example, for cooling electric products and electronic parts.

  As shown in FIGS. 1 and 2, the circuit board 7 electrically connected to the motor 6 and the electronic component 8 with large heat generation disposed on the circuit board 7 are accommodated between the motor 6 and the casing 2. Yes.

  In FIG. 2, the casing 2 is integrated with the casing 2 in such a manner that it starts from the inner surface 13 of the casing side wall facing the ventilation path 9 in the vicinity of the circuit board 7 and passes through the outer side in the vicinity of the electronic component 8 that generates large heat. There is a guide wall 10 disposed.

  When the impeller 1 rotates and air flows through the ventilation path 9, a part of the air flows along the side wall near the central axis of the guide wall 10 and flows in the vicinity of the electronic component 8 that generates a large amount of heat. Heat dissipation from large electronic components is promoted, and temperature rise can be reduced.

  FIG. 3 is an exploded perspective view showing the main configuration of the centrifugal fan motor 2 according to the second embodiment of the present invention. The centrifugal fan motor 1 according to the first embodiment of the present invention shown in FIGS. 1 and 2 is located near the central axis of the guide wall 10 on the inner surface 13 of the casing side wall and faces the electronic component 8 that generates a large amount of heat. A plate-like heat radiation plate 11 made of aluminum, copper, or an alloy thereof is disposed at the site.

  The plate-like heat radiating plate 11 is in contact with the electronic component 8 generating a large amount of heat via a good heat conductive member 12 made of, for example, silicon rubber.

  In the vicinity of the plate-like heat radiation plate 11, air guided by the guide wall 10 passes, and the heat radiation plate 11 has a heat-generating electronic component 8 that generates a large amount of heat from a heat-conductive rubber or gel, or a sheet. Heat is transmitted through the member 12, and the heat radiating plate 11 has a large surface area and higher heat dissipation than the electronic component 8 having a large heat generation. Compared to the configuration, it is possible to remove more heat and suppress the temperature rise of the electronic component 8 that generates a large amount of heat.

  FIG. 4 is an exploded perspective view showing the main configuration of the centrifugal fan motor 3 according to the third embodiment of the present invention. The position of the guide wall provided in the centrifugal fan motor 1 according to the first embodiment shown in FIGS. 1 and 2 is eliminated, and the position facing the ventilation path 9 on the inner surface 13 of the casing side wall is opposed to the electronic component 8 that generates a large amount of heat. A plate-like heat radiating plate 11b made of aluminum, copper, or an alloy thereof is disposed in a region ranging up to.

  The plate-like heat radiating plate 11b is in contact with the electronic component 8b generating a large amount of heat through a good heat conductive rubber-like, gel-like, or sheet-like member 12b.

  Furthermore, the said plate-shaped heat sink 11b faces the ventilation path 9, and an airflow flows on the surface because the impeller 1 rotates. In addition, heat is transmitted to the heat radiating plate 11b from the electronic component 8 having a large heat generation through a heat-conductive rubber-like or gel-like or sheet-like member 12b, and the heat radiating plate 11b has an electronic surface having a large heat generation. Compared with the component 8, it has a large and high heat dissipation property, so that a large amount of heat can be taken from the electronic component 8 with large heat generation, and the temperature rise of the electronic component 8 with large heat generation can be suppressed.

  FIG. 5 is an exploded perspective view showing the main configuration of the centrifugal fan motor 4 according to the fourth embodiment of the present invention. 1 and 2, the guide wall provided in the centrifugal fan motor 1 according to the first embodiment shown in FIG. 1 and FIG. 2 is eliminated, and a circuit board 7 b that is deformed and extended to a position facing the ventilation path 9 on the inner surface 13 of the casing side wall is provided. The electronic component 8b that generates a large amount of heat is disposed on the side facing the ventilation path 9.

  When the impeller 1 rotates and air flows through the ventilation path 9, it flows in the vicinity of the electronic component 8b that generates a large amount of heat, and the air flow promotes heat dissipation from the electronic component that generates a large amount of heat, thereby reducing the temperature rise. .

  6 and 8 are exploded perspective views showing the main configuration of the centrifugal fan motor 5 according to the fifth embodiment of the present invention. For the centrifugal fan motor 4 according to the fourth embodiment of the present invention shown in FIG. 5, in order to prevent turbulent flow caused by unevenness on the circuit board 7b and increase in noise, a resin such as a silicon potting material 13 is used. Alternatively, a rubber-like member is filled to smooth the surface.

  FIG. 7 is an exploded perspective view showing the main configuration of the centrifugal fan motor 6 according to the sixth embodiment of the present invention. For the centrifugal fan motor 4 according to the fourth embodiment of the present invention shown in FIG. 5, a heat-conductive rubber-like or gel-like material is further provided on the side of the ventilation path 9 of the electronic component 8b having a large heat generation on the circuit board 7b. Or the plate-shaped heat sink 11c which consists of aluminum, copper, or those alloys is arrange | positioned through the sheet-like member 12c.

The plate-like heat radiating plate 11c faces the ventilation path 9, and an air flow flows on the surface as the impeller 1 rotates. In addition, heat is transmitted to the heat radiating plate 11c from the heat-generating electronic component 8b through a heat-conductive rubber-like or gel-like or sheet-like member 12c, and the heat radiating plate 11c is an electron having a large surface area. Compared to the configuration of FIG. 5 that does not have the heat sink 11c, the heat of the electronic component 8b that generates a large amount of heat can be removed from the electronic component 8b that generates a large amount of heat. The rise can be suppressed.

  FIG. 11 is a graph showing the results of experiments conducted to verify the effectiveness of the present invention. According to this, the temperature increase of the centrifugal fan motor 1 according to the first embodiment of the present invention is lower than that of the conventional blower, and the temperature increase is further suppressed by the centrifugal fan motor 2 according to the second embodiment of the present invention. I understand that.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various change is possible.

  For example, although omitted in this paper, it is considered that a sheet-like member made of an insulating material such as a sheet made of PET resin is sandwiched between the circuit board 7 and the electronic component 8 having a large heat generation and the heat radiating plate 11. It is done.

  Moreover, although the centrifugal fan motor illustrated in FIGS. 1 to 8 has a flat shape on the inner surface of the casing side plate, in an actual centrifugal fan motor, for the purpose of improving the air flow performance, noise performance, efficiency, and strength, Various shape attempts have been made. For example, as shown in FIG. 9, many annular convex shapes 15 are seen on the casing side plate inner surface 13 on the outer peripheral side of the circuit board. The present invention may be applied to.

  Further, the present invention can be applied even when the position of the electronic component 8 that generates a large amount of heat is at an angle different from that illustrated in FIGS.

  Furthermore, a plurality of guide walls may be provided at different positions as shown in FIG. 10 in order to cool a plurality of heat generating electronic components disposed at a plurality of separated positions.

It is sectional drawing which shows the structure of the centrifugal fan motor which becomes 1st Embodiment. 1 is an exploded perspective view of a centrifugal fan motor according to a first embodiment. It is a disassembled perspective view of the centrifugal fan motor which becomes 2nd Embodiment. It is a disassembled perspective view of the centrifugal fan motor which becomes 3rd Embodiment. It is a disassembled perspective view of the centrifugal fan motor which becomes 4th Embodiment. It is a disassembled perspective view of the centrifugal fan motor which becomes 5th Embodiment. It is a disassembled perspective view of the centrifugal fan motor which becomes 6th Embodiment. It is sectional drawing which shows the structure of the centrifugal fan motor which becomes 5th Embodiment. It is a perspective view which shows the other preferable example of a casing. It is a perspective view which shows the other preferable example of a casing. It is a graph showing the effect verification experiment result of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impeller 2 Casing 3 Cover 4 Intake port 5 Discharge port 6 Motor 7, 7b Circuit board 8, 8b Electronic component with large heat generation 9 Ventilation path 10, 10b Guide walls 11, 11b, 11c Heat radiation plate 12, 12b, 12c Good heat Conductive member 13 Inner surface of casing side wall 14 Impeller hub 15 Annular projection J1 Central axis

Claims (6)

  A cochlear casing provided with an air inlet on one side wall, a motor built in the casing, a circuit board for driving the motor, a control circuit comprising large electronic components mounted thereon, In a centrifugal fan motor having an impeller that is integrally held by the rotor of the motor, a guide wall that extends from the ventilation path to the vicinity of a large heat generating electronic component on the circuit board is provided on the casing side wall on the side opposite to the intake port. A centrifugal fan motor characterized by that.   The centrifugal fan motor according to claim 1, having a plate-like heat radiation plate made of aluminum, copper, or an alloy thereof on a surface near the circuit board of the casing side wall, facing an electronic component having large heat generation, A centrifugal fan motor characterized in that this and a large heat-generating electronic component are in contact with each other by a heat-conductive rubber-like, gel-like, or sheet-like member.   A cochlear casing provided with an air inlet on one side wall, a motor built in the casing, a circuit board for driving the motor, and a control circuit comprising a large heat generating electronic component mounted thereon, In a centrifugal fan motor including an impeller that is integrally held by a rotor of a motor, the surface of the casing side wall facing the circuit board facing the large heat-generating electronic component is made of aluminum, copper, or an alloy thereof. A plate-like heat sink, and a large heat-generating electronic component that is in great contact with the heat-conductive rubber-like or gel-like or sheet-like member, and the heat sink is a ventilation path of the cochlear casing Centrifugal fan motor characterized by a structure extending to   A cochlear casing provided with an air inlet on one side wall, a motor built in the casing, a circuit board for driving the motor, a control circuit comprising large electronic components mounted thereon, In a centrifugal fan motor having an impeller that is integrally held by the rotor of the motor, a part of the circuit board is extended in a direction away from the central axis of the impeller, and the heat generated on the impeller side surface of the circuit board is mounted. A centrifugal fan motor, wherein a large electronic component is disposed facing the ventilation path inside the cochlear casing.   5. The centrifugal fan motor according to claim 4, wherein the surface of the control circuit is caused by an electronic component having a large amount of heat mounted on the impeller side surface of the circuit board facing the ventilation path inside the cochlear casing. A centrifugal fan motor characterized in that the unevenness is filled with a resin such as a silicon potting material or a rubber-like member to smooth the surface.   5. The centrifugal fan motor according to claim 4, wherein the heat generating rubber and the heat conductive rubber are mounted on the heat generating electronic component mounted on the impeller side surface of the circuit board facing the ventilation path inside the cochlear casing. A centrifugal fan motor comprising a plate-like heat radiation plate made of aluminum, copper, or an alloy thereof in contact with each other in the form of a sheet, a gel, or a sheet.