US20150369257A1 - Motor fan - Google Patents
Motor fan Download PDFInfo
- Publication number
- US20150369257A1 US20150369257A1 US14/759,964 US201314759964A US2015369257A1 US 20150369257 A1 US20150369257 A1 US 20150369257A1 US 201314759964 A US201314759964 A US 201314759964A US 2015369257 A1 US2015369257 A1 US 2015369257A1
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- US
- United States
- Prior art keywords
- heat
- motor fan
- base
- air flow
- shroud
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/068—Mechanical details of the pump control unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5813—Cooling the control unit
Definitions
- the present invention relates to a motor fan that accompanies a heat exchanger such as a radiator and a condenser of, for example, an automobile, and more particularly, relates to a motor fan capable of efficiently cooling a controller that controls driving of an electric motor.
- a large amount of air is forcibly passed through a core by a motor fan.
- the motor fan guides an air flow toward the heat exchanger by covering a space between a periphery thereof and the heat exchanger with a shroud in order not to release air introduced by the motor fan to a lateral side.
- a motor fan in which a rotational speed is variable includes a controller that controls driving of an electric motor.
- a controller for example, a PWM (pulse width modulation) unit is used.
- PWM pulse width modulation
- the PWM unit controls driving of an electric motor
- an incorporated power semiconductor switching device called a power device generates heat.
- the motor fan in which the rotational speed is variable has a configuration for cooling the controller including the power device that is a heat generating body.
- Patent Literature 1 proposes to install a controller inside a shroud, and to form a rib that guides air around the controller toward a motor fan side. Patent Literature 1 proposes that an excessive temperature rise of a heat generating body can be suppressed by forming the rib and thereby preventing stagnation of air around the controller.
- Patent Literature 2 has a premise that an air flow generated by a fan is caused to strike a PWM unit to forcibly cool the PWM unit by arranging the PWM unit facing a fan opening portion, and includes means capable of changing an area of the fan opening portion occupied by the PWM unit.
- Patent Literature 2 for example, in order to prevent the PWM unit from disturbing the air flow, the occupied area is reduced when a large air flow rate is required.
- Cited Literature 1 since the proposal in Cited Literature 1 is only at a level of preventing the stagnation of air around the controller, it is difficult to obtain a sufficient cooling effect.
- Patent Literature 2 since the PWM unit is forcibly cooled, cooling performance is high. However, even when the area of the fan opening portion occupied by the PWM unit can be changed to be small, it is undeniable that the air flow interferes with the PWM unit, and the air flow is disturbed. Therefore, in Patent Literature 2, the air flow rate is reduced, and noise is also inevitably generated.
- the present invention has been accomplished in view of the technical problems as described above, and an object thereof is to provide a motor fan capable of efficiently cooling a heat generating body without disturbing an air flow.
- a motor fan of the present invention that has been accomplished in view of the above object including: an impeller that forms an air flow from a suction side toward a discharge side that is a back side of the suction side; an electric motor that rotationally drives the impeller; a shroud including a cylindrical casing that covers an outer periphery of the impeller, and through which the air flow passes, and a base that projects from a periphery of the casing; and a controller that is arranged on the discharge side of the base, controls rotation of the electric motor, and includes a heat generating element, wherein a heat dissipater that is at least partially exposed on the suction side, and is thermally coupled to the heat generating element suppresses a temperature rise of the heat generating element.
- the heat dissipater since the heat dissipater is provided in the base outside the shroud through which the air flow passes, the heat dissipater does not disturb the air flow. Moreover, in the motor fan of the present invention, since the heat dissipater is exposed on the suction side where the heat dissipater can receive the air flow, it is possible to efficiently cool the heat generating element via the heat dissipater.
- the present invention can employ at least first to third forms described below as a form in which the heat dissipater is exposed on the suction side. All the forms have a common effect that the heat dissipater can efficiently cool the heat generating element by the air flow formed on the suction side.
- the heat dissipater while the heat dissipater is arranged on the discharge side of the base, the heat dissipater is exposed on the suction side via a through window that is formed in the base corresponding to the controller.
- the heat dissipater is arranged only on the suction side of the base, and is thermally connected to the heat generating element of the controller via a heat transfer body that penetrates the base.
- the heat dissipater is formed integrally with the shroud.
- the shroud since the shroud also exerts a heat dissipation action, it is possible to more efficiently cool the heat generating element.
- the heat dissipater is preferably accommodated within a heat dissipater accommodation chamber that is provided in the base and retracted toward the discharge side. Since a projecting height of the heat dissipater can be increased, high heat dissipation efficiency can be obtained.
- the heat dissipater since the heat dissipater is provided in the base outside the casing of the shroud through which the air flow passes, the heat dissipater does not disturb the air flow. Moreover, in the motor fan of the present invention, since the heat dissipater is at least partially exposed on the suction side where the heat dissipater can receive the air flow, it is possible to efficiently cool the heat generating element via the heat dissipater.
- FIGS. 1A and 1B show a motor fan in a first embodiment: FIG. 1A is a front view as viewed from a discharge side; and FIG. 1B is a front view as viewed from a suction side.
- FIGS. 2A and 2B show a shroud of the motor fan in the first embodiment: FIG. 2A is a perspective view as viewed from the discharge side; and FIG. 2B is a perspective view as viewed from the suction side.
- FIG. 3 is an enlarged view of a vicinity of a control unit of the motor fan in the first embodiment as viewed from the suction side.
- FIG. 4 is an enlarged sectional view illustrating the vicinity of the control unit of the motor fan in the first embodiment.
- FIG. 5 is a sectional view corresponding to FIG. 4 illustrating a motor fan in a second embodiment.
- FIG. 6 is a sectional view corresponding to FIG. 4 illustrating a motor fan in a third embodiment.
- FIG. 7 is a sectional view corresponding to FIG. 4 illustrating a modification of the present invention.
- a motor fan 1 for an automobile of a present embodiment will be described with reference to FIGS. 1 A, 1 B to 4 .
- the motor fan 1 is arranged facing a rear side of a radiator that is omitted in the drawings, and when an air flow generated from a front toward a rear with the motor fan 1 rotationally driven passes through the radiator, heat exchange is performed between a medium flowing through an inner portion of the radiator and outside air as the air flow.
- the front and the rear in the present embodiment are based on a direction in which the automobile travels forward, while, regarding the motor fan 1 , a side facing the radiator is sometimes referred to as a “suction side”, and a back side thereof is sometimes referred to as a “discharge side”.
- the motor fan 1 includes a fan 5 , a shroud 10 that accommodates the fan 5 and holds a control unit 40 , and the control unit 40 that controls a rotating operation of the fan 5 .
- the motor fan 1 employs a structure in which the control unit 40 is arranged on the discharge side of the shroud 10 , and heat dissipation pins 52 constituting a heat dissipater of the control unit 40 are exposed on the suction side of the shroud 10 . Therefore, in the motor fan 1 , a part of the air flow generated from the suction side toward the discharge side with the fan 5 rotating passes through the heat dissipation pins 52 , so that the control unit 40 can be efficiently cooled. Moreover, in the motor fan 1 , interference between the control unit 40 and the air flow can be avoided by arranging the control unit 40 at a corner 12 of the shroud 10 . In the following, respective elements will be sequentially described.
- the fan 5 includes an electric motor 6 that is fixed to and supported by the shroud 10 with a bolt, and a fan body 7 that is connected to a rotating shaft 6 a of the electric motor 6 .
- the fan body 7 includes a bottomed cylindrical boss 7 a that is fixed to the rotating shaft 6 a, and an impeller 7 b that is composed of a plurality of blades projecting radially outward from an outer periphery of the boss 7 a.
- the shroud 10 is a member that is integrally formed by injection-molding resin, and includes a base 11 having a mortar shape with a rectangular outer shape, and a casing 16 that is provided in a center portion of the base 11 .
- the base 11 guides the air flow on the suction side to the casing 16 .
- the base 11 includes a fixing frame 13 that fixes the control unit 40 to one corner 12 out of four corners 12 .
- the fixing frame 13 is provided on the discharge side of the base 11 so as to have a rectangular outer shape in plan view, and the control unit 40 is fixed to the base 11 by means such as fastening or bonding in a state in which the control unit 40 is mounted on a distal end of the fixing frame 13 . Since a through window 14 that brings into communication the suction side at the distal end and the discharge side of the fixing frame 13 is formed, a pin accommodation chamber 15 penetrates from a front to a back of the base 11 .
- the heat dissipation pins 52 of the control unit 40 held by the fixing frame 13 penetrate the through window 14 to be exposed in the pin accommodation chamber 15 .
- An inner portion of the fixing frame 13 forms the pin accommodation chamber 15 that is retracted toward the discharge side with respect to a surface on the suction side of the base 11 .
- the casing 16 includes an outer ring 17 that cylindrically projects from a surface on the discharge side of the base 11 , and a discharge grill 18 that covers a distal end of the outer ring 17 .
- the fan 5 is accommodated and held in a region surrounded by the outer ring 17 and the discharge grill 18 such that the fan body 7 is arranged toward the suction side.
- the outer ring 17 is allowed to have high rigidity together with the base 11 by fixing a distal end of a rib 19 formed on the surface on the discharge side of the base 11 to an outer periphery thereof.
- the rib 19 extends toward the outer ring 17 from each of three corners 12 except the position where the fixing frame 13 is provided.
- the discharge grill 18 includes a plurality of radial fins 18 a in order to rectify the discharged air flow.
- the discharge grill 18 is penetrated from a front to a back except a portion where the fins 18 a are provided, and the air flow generated by the fan 5 passes through the discharge grill 18 to flow to the discharge side.
- the fixing frame 13 to which the control unit 40 is fixed is located at the corner 12 outside the discharge grill 18 , so that the air flow passing through the discharge grill 18 does not interfere with the control unit 40 .
- control unit 40 is accommodated and held in the fixing frame 13 .
- a PWM unit is used as the control unit 40 .
- the PWM unit is an electronic part that controls a rotational speed of the electric motor 6 of the fan 5 , and is electrically/mechanically connected to the electric motor 6 via an unillustrated wire.
- control unit 40 As shown in FIG. 4 , a power board 41 and a CPU board 45 are arranged facing each other.
- a high-voltage current is supplied to the power board 41 from an external high-voltage power source (not shown).
- a switching device 42 composed of a transistor is attached to a surface of the power board 41 on a side facing the CPU board 45 (a front side).
- a heat transfer plate 44 that performs thermal conduction between the switching device 42 and a heat sink 50 described later is embedded in the power board 41 , and the heat transfer plate 44 penetrates from a front to a back of the power board 41 .
- the power board 41 and the CPU board 45 are attached, one of surfaces of the heat transfer plate 44 comes into close contact with the switching device 42 , and the other of the surfaces comes into close contact with a heat transfer projection 53 of the heat sink 50 described later.
- a CPU 37 that controls an operation of the switching device 42 is provided on the CPU board 45 .
- the switching device 42 is operated. Accordingly, a high voltage supplied from the high-voltage power source is applied to the electric motor 6 of the fan 5 , and the fan body 7 is rotationally driven at a desired speed.
- the switching device 42 generates heat in association with the operation of the switching device 42 .
- control unit 40 The above respective elements of the control unit 40 are covered with a cover 49 .
- the control unit 40 includes the heat sink 50 that functions as the heat dissipater.
- the heat sink 50 is arranged facing the power board 41 , and when the switching device 42 of the power board 41 generates heat, the heat sink 50 dissipates the heat to prevent a temperature of the switching device 42 from exceeding a permissible range.
- the heat sink 50 includes a flat plate-like sink body 51 , the plurality of heat dissipation pins 52 that are provided on one surface side of the sink body 51 , and the heat transfer projection 53 that is provided on the other surface side of the sink body 51 .
- the sink body 51 , the heat dissipation pins 52 , and the heat transfer projection 53 are integrally formed by casting aluminum alloy.
- the heat transfer projection 53 is arranged facing the power board 41 , and the power board 41 and the CPU board 45 , and the sink body 51 are fastened together with bolts.
- the control unit 40 is held by the shroud 10 .
- a distal end of the heat transfer projection 53 of the heat sink 50 is in close contact with the heat transfer plate 44 , and the switching device 42 of the power board 41 and the heat sink 50 are thermally coupled together.
- the heat dissipation pins 52 penetrate the through window 14 formed inside the fixing frame 13 , to be accommodated in the pin accommodation chamber 15 as shown in FIG. 3 . Therefore, the heat dissipation pins 52 , which are a part of the heat sink 50 , are exposed on the suction side of the shroud 10 .
- the plurality of heat dissipation pins 52 are arranged in a zigzag grid shape with respect to the air flow A, and the air flow A passing through the pin accommodation chamber 15 is highly likely to come into touch with any of the heat dissipation pins 52 .
- the arrangement of the heat dissipation pins 52 is a preferable form, and is not an element that limits the present invention.
- the motor fan 1 having the above configuration provides the following operations and effects.
- the control unit 40 including the heat sink 50 is provided at the corner 12 of the shroud 10 (the base 11 ), the control unit 40 does not interfere with the air flow passing through the discharge grill 18 . Therefore, performance of the motor fan 1 is not deteriorated, and the control unit 40 also does not become a cause of noise generation. Also, since the control unit 40 is arranged at the corner 12 that is easily accessed, it is easy to perform maintenance and inspection works of the motor fan 1 .
- the heat dissipation pins 52 of the heat sink 50 are exposed in the pin accommodation chamber 15 that is on the way of the air flow A generated when the motor fan 1 is driven. Therefore, since the heat generated in the switching device 42 while the motor fan 1 is being driven reaches the heat dissipation pins 52 through the heat transfer plate 44 of the power board 41 , the heat transfer projection 53 and the sink body 51 of the heat sink 50 , the heat is also cooled by heat exchange with the air flow A, and is thereby dissipated with high efficiency. While the air flow A passes through the heat dissipation pins 52 (the heat sink 50 ), its flow velocity is low, so that noise generation can be minimized. This means that an effect of suppressing a pressure loss of the air flow by providing the heat sink 50 can be also expected.
- a length of the heat dissipation pins 52 can be extended by a length of the pin accommodation chamber 15 as compared to a configuration in which the heat dissipation pins 52 are caused to project from the surface on the discharge side of the base 11 . Therefore, heat dissipation efficiency by the heat dissipation pins 52 can be increased.
- the heat dissipation pins 52 are caused to project from the surface on the discharge side of the base 11 , and the length is set to about the same length as that in the present embodiment, distal ends of the heat dissipation pins 52 project from the base 11 , and possibly interfere with a member that fixes the motor fan 1 .
- a motor fan 2 of the second embodiment includes a fixing stand 113 corresponding to the fixing frame 13 .
- the fixing stand 113 includes a stand board 115 that is solid except an inlay insertion path 114 at a distal end.
- the power board 41 includes an inlay 48 that is thermally connected to the switching device 42 in the control unit 40 .
- the inlay 48 is formed of copper or copper alloy having a high thermal conductivity, with one end penetrating the power board 41 to come into close contact with the switching device 42 , and the other end penetrating the inlay insertion path 114 of the stand board 115 of the fixing stand 113 to come into close contact with the sink body 51 of a heat sink 60 .
- the heat sink 60 can be considered to be provided with the inlay 48 instead of the heat transfer projection 53 of the first embodiment. Also, the heat sink 60 is arranged only on the suction side with respect to the stand board 115 , and is entirely exposed on the suction side.
- the motor fan 2 provides the following effect in addition to the same effects as those of the motor fan 1 of the first embodiment.
- a shroud 20 of the second embodiment has higher rigidity than the shroud 10 of the first embodiment.
- the heat generated in the switching device 42 during driving reaches the heat dissipation pins 52 through the inlay 48 of the power board 41 and the sink body 51 of the heat sink 60 in the motor fan 2 .
- a shroud 30 is integrally formed including a heat sink 70 by casing aluminum alloy.
- the heat sink 70 includes the sink body 51 , the heat dissipation pins 52 , and the heat transfer projection 53 similarly to the heat sink 50 , the sink body 51 is provided so as to close the through window 14 of the fixing frame 13 (the first embodiment).
- the motor fan 3 provides the following effects in addition to the same effects as those of the motor fan 1 of the first embodiment.
- a path from the sink body 51 to the shroud 30 is provided in addition to a path through the heat transfer plate 44 of the power board 41 , the heat transfer projection 53 , the sink body 51 , and the heat dissipation pins 52 of the heat sink 70 , so that a high heat dissipation effect can be expected in the motor fan 3 .
- the solid sink body 51 forms a portion of the shroud 30 , and the shroud 30 does not have a through hole like the inlay insertion path 114 of the second embodiment, rigidity of the shroud 30 can be increased as compared to the second embodiment.
- heat dissipation pins 52 of the same height are formed in the present embodiment, heat dissipation pins of different heights can be formed in the present invention.
- heat dissipation pins 52 close to an outer periphery of the shroud 10 have a large height
- the heat dissipation pins 52 close to an inner side of the shroud 10 (a lower side in the drawing) have a small height.
- the height is decreased in order to reduce noise by the heat dissipation pins 52 , while the height of the heat dissipation pins 52 provided at a position far from the fan 5 is increased in view of the heat dissipation effect.
- the present invention is not limited thereto, and for example, a form in which thin plate-like fins are provided at intervals, or a dimple-shaped form in which concavities and convexities are provided on the surface on the suction side of the sink body 51 , or the like can be employed. Also, although the heat dissipation pins 52 as a part of the heat sink 50 and the surface of the sink body 51 where the heat dissipation pins 52 are formed are exposed on the suction side in the present embodiment, an entire region of the sink body 51 , or further up to the heat transfer projection 53 can be also exposed on the suction side.
- the pin accommodation chamber 15 has a rectangular shape in plan view, the present invention is not limited thereto, and for example, a width of a portion corresponding to a downstream side of the air flow A can be enlarged in order to cause the air flow A to smoothly flow.
- the materials forming the members of the present embodiment are merely illustrative, and for example, although the heat sink 50 is formed of aluminum alloy, the heat sink 50 can be also formed of other metal materials, particularly, copper or copper alloy having a high thermal conductivity. Also, although the example in which the heat sink 50 is integrally formed is described, the heat sink may be configured by combining a plurality of members.
- the switching device 42 is exemplified as a heat generating element in the present embodiment, a resistor is cited as another heat generating element.
Abstract
Description
- The present invention relates to a motor fan that accompanies a heat exchanger such as a radiator and a condenser of, for example, an automobile, and more particularly, relates to a motor fan capable of efficiently cooling a controller that controls driving of an electric motor.
- In a heat exchanger such as a radiator and a condenser of an automobile, a large amount of air is forcibly passed through a core by a motor fan. The motor fan guides an air flow toward the heat exchanger by covering a space between a periphery thereof and the heat exchanger with a shroud in order not to release air introduced by the motor fan to a lateral side.
- A motor fan in which a rotational speed is variable includes a controller that controls driving of an electric motor. As the controller, for example, a PWM (pulse width modulation) unit is used. When the PWM unit controls driving of an electric motor, an incorporated power semiconductor switching device called a power device generates heat. To maintain performance of the PWM unit, it is necessary to cool the power device so as to keep a temperature of the power device at a permissible value or less. Therefore, the motor fan in which the rotational speed is variable has a configuration for cooling the controller including the power device that is a heat generating body.
- For example, Patent Literature 1 proposes to install a controller inside a shroud, and to form a rib that guides air around the controller toward a motor fan side. Patent Literature 1 proposes that an excessive temperature rise of a heat generating body can be suppressed by forming the rib and thereby preventing stagnation of air around the controller.
- Also,
Patent Literature 2 has a premise that an air flow generated by a fan is caused to strike a PWM unit to forcibly cool the PWM unit by arranging the PWM unit facing a fan opening portion, and includes means capable of changing an area of the fan opening portion occupied by the PWM unit. InPatent Literature 2, for example, in order to prevent the PWM unit from disturbing the air flow, the occupied area is reduced when a large air flow rate is required. -
- Patent Literature 1: Japanese Patent Laid-Open No. 2006-90243
- Patent Literature 2: Japanese Patent Laid-Open No. 2010-151005
- However, since the proposal in Cited Literature 1 is only at a level of preventing the stagnation of air around the controller, it is difficult to obtain a sufficient cooling effect.
- In
Patent Literature 2, since the PWM unit is forcibly cooled, cooling performance is high. However, even when the area of the fan opening portion occupied by the PWM unit can be changed to be small, it is undeniable that the air flow interferes with the PWM unit, and the air flow is disturbed. Therefore, inPatent Literature 2, the air flow rate is reduced, and noise is also inevitably generated. - The present invention has been accomplished in view of the technical problems as described above, and an object thereof is to provide a motor fan capable of efficiently cooling a heat generating body without disturbing an air flow.
- A motor fan of the present invention that has been accomplished in view of the above object including: an impeller that forms an air flow from a suction side toward a discharge side that is a back side of the suction side; an electric motor that rotationally drives the impeller; a shroud including a cylindrical casing that covers an outer periphery of the impeller, and through which the air flow passes, and a base that projects from a periphery of the casing; and a controller that is arranged on the discharge side of the base, controls rotation of the electric motor, and includes a heat generating element, wherein a heat dissipater that is at least partially exposed on the suction side, and is thermally coupled to the heat generating element suppresses a temperature rise of the heat generating element.
- In the motor fan of the present invention, since the heat dissipater is provided in the base outside the shroud through which the air flow passes, the heat dissipater does not disturb the air flow. Moreover, in the motor fan of the present invention, since the heat dissipater is exposed on the suction side where the heat dissipater can receive the air flow, it is possible to efficiently cool the heat generating element via the heat dissipater.
- The present invention can employ at least first to third forms described below as a form in which the heat dissipater is exposed on the suction side. All the forms have a common effect that the heat dissipater can efficiently cool the heat generating element by the air flow formed on the suction side.
- In the first form, while the heat dissipater is arranged on the discharge side of the base, the heat dissipater is exposed on the suction side via a through window that is formed in the base corresponding to the controller.
- In accordance with the first form, since the heat dissipater is exposed on the suction side, it is possible to more efficiently cool the heat generating element.
- In the second form, the heat dissipater is arranged only on the suction side of the base, and is thermally connected to the heat generating element of the controller via a heat transfer body that penetrates the base.
- In accordance with the second form, since the base is penetrated only in a region corresponding to the heat transfer body, rigidity of the shroud can be increased.
- In the third form, the heat dissipater is formed integrally with the shroud.
- In accordance with the third form, since the shroud also exerts a heat dissipation action, it is possible to more efficiently cool the heat generating element.
- In the present invention, the heat dissipater is preferably accommodated within a heat dissipater accommodation chamber that is provided in the base and retracted toward the discharge side. Since a projecting height of the heat dissipater can be increased, high heat dissipation efficiency can be obtained.
- In accordance with the present invention, since the heat dissipater is provided in the base outside the casing of the shroud through which the air flow passes, the heat dissipater does not disturb the air flow. Moreover, in the motor fan of the present invention, since the heat dissipater is at least partially exposed on the suction side where the heat dissipater can receive the air flow, it is possible to efficiently cool the heat generating element via the heat dissipater.
-
FIGS. 1A and 1B show a motor fan in a first embodiment:FIG. 1A is a front view as viewed from a discharge side; andFIG. 1B is a front view as viewed from a suction side. -
FIGS. 2A and 2B show a shroud of the motor fan in the first embodiment:FIG. 2A is a perspective view as viewed from the discharge side; andFIG. 2B is a perspective view as viewed from the suction side. -
FIG. 3 is an enlarged view of a vicinity of a control unit of the motor fan in the first embodiment as viewed from the suction side. -
FIG. 4 is an enlarged sectional view illustrating the vicinity of the control unit of the motor fan in the first embodiment. -
FIG. 5 is a sectional view corresponding toFIG. 4 illustrating a motor fan in a second embodiment. -
FIG. 6 is a sectional view corresponding toFIG. 4 illustrating a motor fan in a third embodiment. -
FIG. 7 is a sectional view corresponding toFIG. 4 illustrating a modification of the present invention. - In the following, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
- A motor fan 1 for an automobile of a present embodiment will be described with reference to FIGS. 1A,1B to 4.
- The motor fan 1 is arranged facing a rear side of a radiator that is omitted in the drawings, and when an air flow generated from a front toward a rear with the motor fan 1 rotationally driven passes through the radiator, heat exchange is performed between a medium flowing through an inner portion of the radiator and outside air as the air flow. Note that the front and the rear in the present embodiment are based on a direction in which the automobile travels forward, while, regarding the motor fan 1, a side facing the radiator is sometimes referred to as a “suction side”, and a back side thereof is sometimes referred to as a “discharge side”.
- As shown in FIGS. 1A,1B and 2A,2B, the motor fan 1 includes a
fan 5, ashroud 10 that accommodates thefan 5 and holds acontrol unit 40, and thecontrol unit 40 that controls a rotating operation of thefan 5. - The motor fan 1 employs a structure in which the
control unit 40 is arranged on the discharge side of theshroud 10, and heat dissipation pins 52 constituting a heat dissipater of thecontrol unit 40 are exposed on the suction side of theshroud 10. Therefore, in the motor fan 1, a part of the air flow generated from the suction side toward the discharge side with thefan 5 rotating passes through the heat dissipation pins 52, so that thecontrol unit 40 can be efficiently cooled. Moreover, in the motor fan 1, interference between thecontrol unit 40 and the air flow can be avoided by arranging thecontrol unit 40 at acorner 12 of theshroud 10. In the following, respective elements will be sequentially described. - As shown in
FIG. 1B , thefan 5 includes an electric motor 6 that is fixed to and supported by theshroud 10 with a bolt, and afan body 7 that is connected to a rotating shaft 6 a of the electric motor 6. Thefan body 7 includes a bottomedcylindrical boss 7 a that is fixed to the rotating shaft 6 a, and animpeller 7 b that is composed of a plurality of blades projecting radially outward from an outer periphery of theboss 7 a. - The
shroud 10 is a member that is integrally formed by injection-molding resin, and includes a base 11 having a mortar shape with a rectangular outer shape, and acasing 16 that is provided in a center portion of thebase 11. - The base 11 guides the air flow on the suction side to the
casing 16. Thebase 11 includes a fixingframe 13 that fixes thecontrol unit 40 to onecorner 12 out of fourcorners 12. The fixingframe 13 is provided on the discharge side of the base 11 so as to have a rectangular outer shape in plan view, and thecontrol unit 40 is fixed to thebase 11 by means such as fastening or bonding in a state in which thecontrol unit 40 is mounted on a distal end of the fixingframe 13. Since a throughwindow 14 that brings into communication the suction side at the distal end and the discharge side of the fixingframe 13 is formed, apin accommodation chamber 15 penetrates from a front to a back of thebase 11. Although the details are described later, the heat dissipation pins 52 of thecontrol unit 40 held by the fixingframe 13 penetrate the throughwindow 14 to be exposed in thepin accommodation chamber 15. An inner portion of the fixingframe 13 forms thepin accommodation chamber 15 that is retracted toward the discharge side with respect to a surface on the suction side of thebase 11. - As shown in
FIGS. 1A and 1B , thecasing 16 includes anouter ring 17 that cylindrically projects from a surface on the discharge side of thebase 11, and adischarge grill 18 that covers a distal end of theouter ring 17. Thefan 5 is accommodated and held in a region surrounded by theouter ring 17 and thedischarge grill 18 such that thefan body 7 is arranged toward the suction side. - The
outer ring 17 is allowed to have high rigidity together with the base 11 by fixing a distal end of arib 19 formed on the surface on the discharge side of the base 11 to an outer periphery thereof. Therib 19 extends toward theouter ring 17 from each of threecorners 12 except the position where the fixingframe 13 is provided. - The
discharge grill 18 includes a plurality ofradial fins 18 a in order to rectify the discharged air flow. Thedischarge grill 18 is penetrated from a front to a back except a portion where thefins 18 a are provided, and the air flow generated by thefan 5 passes through thedischarge grill 18 to flow to the discharge side. The fixingframe 13 to which thecontrol unit 40 is fixed is located at thecorner 12 outside thedischarge grill 18, so that the air flow passing through thedischarge grill 18 does not interfere with thecontrol unit 40. - As described above, the
control unit 40 is accommodated and held in the fixingframe 13. In the present embodiment, a PWM unit is used as thecontrol unit 40. The PWM unit is an electronic part that controls a rotational speed of the electric motor 6 of thefan 5, and is electrically/mechanically connected to the electric motor 6 via an unillustrated wire. - In the
control unit 40, as shown inFIG. 4 , apower board 41 and aCPU board 45 are arranged facing each other. - A high-voltage current is supplied to the
power board 41 from an external high-voltage power source (not shown). A switchingdevice 42 composed of a transistor is attached to a surface of thepower board 41 on a side facing the CPU board 45 (a front side). Aheat transfer plate 44 that performs thermal conduction between the switchingdevice 42 and aheat sink 50 described later is embedded in thepower board 41, and theheat transfer plate 44 penetrates from a front to a back of thepower board 41. When thepower board 41 and theCPU board 45 are attached, one of surfaces of theheat transfer plate 44 comes into close contact with the switchingdevice 42, and the other of the surfaces comes into close contact with aheat transfer projection 53 of theheat sink 50 described later. - A
CPU 37 that controls an operation of theswitching device 42 is provided on theCPU board 45. When a control signal from theCPU 37 is transmitted to thepower board 41 and input to theswitching device 42, the switchingdevice 42 is operated. Accordingly, a high voltage supplied from the high-voltage power source is applied to the electric motor 6 of thefan 5, and thefan body 7 is rotationally driven at a desired speed. The switchingdevice 42 generates heat in association with the operation of theswitching device 42. - The above respective elements of the
control unit 40 are covered with acover 49. - The
control unit 40 includes theheat sink 50 that functions as the heat dissipater. Theheat sink 50 is arranged facing thepower board 41, and when theswitching device 42 of thepower board 41 generates heat, theheat sink 50 dissipates the heat to prevent a temperature of theswitching device 42 from exceeding a permissible range. - The
heat sink 50 includes a flat plate-like sink body 51, the plurality of heat dissipation pins 52 that are provided on one surface side of thesink body 51, and theheat transfer projection 53 that is provided on the other surface side of thesink body 51. In theheat sink 50, thesink body 51, the heat dissipation pins 52, and theheat transfer projection 53 are integrally formed by casting aluminum alloy. - In the
heat sink 50, theheat transfer projection 53 is arranged facing thepower board 41, and thepower board 41 and theCPU board 45, and thesink body 51 are fastened together with bolts. When thesink body 51 is fixed to the fixingframe 13 of theshroud 10, thecontrol unit 40 is held by theshroud 10. In this state, a distal end of theheat transfer projection 53 of theheat sink 50 is in close contact with theheat transfer plate 44, and theswitching device 42 of thepower board 41 and theheat sink 50 are thermally coupled together. - In a state in which the
heat sink 50 is fixed to theshroud 10, the heat dissipation pins 52 penetrate the throughwindow 14 formed inside the fixingframe 13, to be accommodated in thepin accommodation chamber 15 as shown inFIG. 3 . Therefore, the heat dissipation pins 52, which are a part of theheat sink 50, are exposed on the suction side of theshroud 10. - When the
fan 5 rotates, air on the suction side is sucked in, passes through a gap of theimpeller 7 b of thefan body 7, and is discharged to the discharge side as the air flow. At this time, as shown inFIG. 3 , a part of the generated air flow flows from an outer peripheral side toward an inner peripheral side along thebase 11 of the shroud 10 (reference character A inFIG. 3 ), and it is understood that thepin accommodation chamber 15 is on a way of the air flow A. The air flow A has a lower flow velocity than, for example, the air flow passing through an inner side of theouter ring 17 of thecasing 16. The plurality of heat dissipation pins 52 are arranged in a zigzag grid shape with respect to the air flow A, and the air flow A passing through thepin accommodation chamber 15 is highly likely to come into touch with any of the heat dissipation pins 52. However, the arrangement of the heat dissipation pins 52 is a preferable form, and is not an element that limits the present invention. - The motor fan 1 having the above configuration provides the following operations and effects.
- In the motor fan 1, since the
control unit 40 including theheat sink 50 is provided at thecorner 12 of the shroud 10 (the base 11), thecontrol unit 40 does not interfere with the air flow passing through thedischarge grill 18. Therefore, performance of the motor fan 1 is not deteriorated, and thecontrol unit 40 also does not become a cause of noise generation. Also, since thecontrol unit 40 is arranged at thecorner 12 that is easily accessed, it is easy to perform maintenance and inspection works of the motor fan 1. - Moreover, in the motor fan 1, the heat dissipation pins 52 of the
heat sink 50 are exposed in thepin accommodation chamber 15 that is on the way of the air flow A generated when the motor fan 1 is driven. Therefore, since the heat generated in theswitching device 42 while the motor fan 1 is being driven reaches the heat dissipation pins 52 through theheat transfer plate 44 of thepower board 41, theheat transfer projection 53 and thesink body 51 of theheat sink 50, the heat is also cooled by heat exchange with the air flow A, and is thereby dissipated with high efficiency. While the air flow A passes through the heat dissipation pins 52 (the heat sink 50), its flow velocity is low, so that noise generation can be minimized. This means that an effect of suppressing a pressure loss of the air flow by providing theheat sink 50 can be also expected. - In the motor fan 1, since the
pin accommodation chamber 15 that is depressed from thebase 11 is provided, and the heat dissipation pins 52 are accommodated therein, a length of the heat dissipation pins 52 can be extended by a length of thepin accommodation chamber 15 as compared to a configuration in which the heat dissipation pins 52 are caused to project from the surface on the discharge side of thebase 11. Therefore, heat dissipation efficiency by the heat dissipation pins 52 can be increased. If the heat dissipation pins 52 are caused to project from the surface on the discharge side of thebase 11, and the length is set to about the same length as that in the present embodiment, distal ends of the heat dissipation pins 52 project from thebase 11, and possibly interfere with a member that fixes the motor fan 1. - Next, a second embodiment according to the present invention will be described. Since a basic configuration of the second embodiment is the same as that of the first embodiment, the second embodiment will be described below by focusing on a difference from the first embodiment.
- As shown in
FIG. 5 , amotor fan 2 of the second embodiment includes a fixingstand 113 corresponding to the fixingframe 13. Unlike the fixingframe 13, the fixingstand 113 includes astand board 115 that is solid except aninlay insertion path 114 at a distal end. - Subsequently, in the
motor fan 2, thepower board 41 includes aninlay 48 that is thermally connected to theswitching device 42 in thecontrol unit 40. Theinlay 48 is formed of copper or copper alloy having a high thermal conductivity, with one end penetrating thepower board 41 to come into close contact with the switchingdevice 42, and the other end penetrating theinlay insertion path 114 of thestand board 115 of the fixingstand 113 to come into close contact with thesink body 51 of aheat sink 60. Theheat sink 60 can be considered to be provided with theinlay 48 instead of theheat transfer projection 53 of the first embodiment. Also, theheat sink 60 is arranged only on the suction side with respect to thestand board 115, and is entirely exposed on the suction side. - The
motor fan 2 provides the following effect in addition to the same effects as those of the motor fan 1 of the first embodiment. - While the through
window 14 is formed at the distal end of the fixingframe 13 of the first embodiment, themotor fan 2 employs thestand board 115 that is solid except theinlay insertion path 114. Therefore, ashroud 20 of the second embodiment has higher rigidity than theshroud 10 of the first embodiment. - Note that the heat generated in the
switching device 42 during driving reaches the heat dissipation pins 52 through theinlay 48 of thepower board 41 and thesink body 51 of theheat sink 60 in themotor fan 2. - Next, a third embodiment according to the present invention will be described. Since a basic configuration of the third embodiment is the same as that of the first embodiment, the third embodiment will be described below by focusing on a difference from the first embodiment.
- In a motor fan 3 of the third embodiment, as shown in
FIG. 6 , ashroud 30 is integrally formed including aheat sink 70 by casing aluminum alloy. - While the
heat sink 70 includes thesink body 51, the heat dissipation pins 52, and theheat transfer projection 53 similarly to theheat sink 50, thesink body 51 is provided so as to close the throughwindow 14 of the fixing frame 13 (the first embodiment). - Since the
heat sink 70 is formed integrally with theshroud 30, the motor fan 3 provides the following effects in addition to the same effects as those of the motor fan 1 of the first embodiment. - As a path through which the heat generated in the
switching device 42 is dissipated, a path from thesink body 51 to theshroud 30 is provided in addition to a path through theheat transfer plate 44 of thepower board 41, theheat transfer projection 53, thesink body 51, and the heat dissipation pins 52 of theheat sink 70, so that a high heat dissipation effect can be expected in the motor fan 3. - Furthermore, since the
solid sink body 51 forms a portion of theshroud 30, and theshroud 30 does not have a through hole like theinlay insertion path 114 of the second embodiment, rigidity of theshroud 30 can be increased as compared to the second embodiment. - Also, in the motor fan 3, it becomes unnecessary to attach the
heat sink 70 to theshroud 30. - Although the embodiments of the present invention have been described above, the constitutions described in the aforementioned embodiments may be freely selected or appropriately changed into other constitutions without departing from the scope of the present invention.
- Although the heat dissipation pins 52 of the same height are formed in the present embodiment, heat dissipation pins of different heights can be formed in the present invention. In this case, as shown in
FIG. 7 , it is preferable that the heat dissipation pins 52 close to an outer periphery of the shroud 10 (an upper side in the drawing) have a large height, and on the contrary, the heat dissipation pins 52 close to an inner side of the shroud 10 (a lower side in the drawing) have a small height. Since thefan 5 is arranged inside theshroud 10, the height is decreased in order to reduce noise by the heat dissipation pins 52, while the height of the heat dissipation pins 52 provided at a position far from thefan 5 is increased in view of the heat dissipation effect. - Although the heat dissipation pins 52 are used as a member for heat dissipation in the present embodiment, the present invention is not limited thereto, and for example, a form in which thin plate-like fins are provided at intervals, or a dimple-shaped form in which concavities and convexities are provided on the surface on the suction side of the
sink body 51, or the like can be employed. Also, although the heat dissipation pins 52 as a part of theheat sink 50 and the surface of thesink body 51 where the heat dissipation pins 52 are formed are exposed on the suction side in the present embodiment, an entire region of thesink body 51, or further up to theheat transfer projection 53 can be also exposed on the suction side. - Also, although the
pin accommodation chamber 15 has a rectangular shape in plan view, the present invention is not limited thereto, and for example, a width of a portion corresponding to a downstream side of the air flow A can be enlarged in order to cause the air flow A to smoothly flow. - Also, the materials forming the members of the present embodiment are merely illustrative, and for example, although the
heat sink 50 is formed of aluminum alloy, theheat sink 50 can be also formed of other metal materials, particularly, copper or copper alloy having a high thermal conductivity. Also, although the example in which theheat sink 50 is integrally formed is described, the heat sink may be configured by combining a plurality of members. - Although the
switching device 42 is exemplified as a heat generating element in the present embodiment, a resistor is cited as another heat generating element. -
- 1, 2, 3 Motor fan
- 5 Fan
- 6 Electric motor
- 6 a Rotating shaft
- 7 Fan body
- 7 a Boss
- 7 b Impeller
- 10, 20, 30 Shroud
- 11 Base
- 12 Corner
- 13 Fixing frame
- 14 Through window
- 15 Pin accommodation chamber
- 16 Casing
- 17 Outer ring
- 18 Discharge grill
- 18 a Fin
- 19 Rib
- 40 Control unit
- 41 Power board
- 42 Switching device (heat generating element)
- 44 Heat transfer plate
- 45 CPU board
- 48 Inlay
- 49 Cover
- 50, 60, 70 Heat sink (heat dissipater)
- 51 Sink body
- 52 Heat dissipation pin
- 53 Heat transfer projection
- 113 Fixing stand
- 114 Inlay insertion path
- 115 Stand board
- A Air flow
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013-058494 | 2013-03-21 | ||
JP2013058494A JP6126421B2 (en) | 2013-03-21 | 2013-03-21 | Motor fan |
PCT/JP2013/006017 WO2014147678A1 (en) | 2013-03-21 | 2013-10-09 | Motor fan |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150369257A1 true US20150369257A1 (en) | 2015-12-24 |
Family
ID=51579420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/759,964 Abandoned US20150369257A1 (en) | 2013-03-21 | 2013-10-09 | Motor fan |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150369257A1 (en) |
JP (1) | JP6126421B2 (en) |
CN (1) | CN105074227B (en) |
DE (1) | DE112013006329T5 (en) |
WO (1) | WO2014147678A1 (en) |
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US20160208810A1 (en) * | 2015-01-05 | 2016-07-21 | Johnson Electric S.A. | Cooling Fan Module |
US20180124948A1 (en) * | 2016-10-27 | 2018-05-03 | Fanuc Corporation | Fan attachment structure and fan |
EP3412918A1 (en) * | 2015-07-06 | 2018-12-12 | Zhejiang Sanhua Automotive Components Co., Ltd. | Electrically driven pump |
IT201800009082A1 (en) * | 2018-10-02 | 2020-04-02 | Vip Air Empowerment Srl | Fan for industrial use |
US20230070319A1 (en) * | 2021-09-08 | 2023-03-09 | Dell Products L.P. | Fan covering with high recycle content and high thermal conductivity |
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JP6350240B2 (en) * | 2014-11-24 | 2018-07-04 | 株式会社デンソー | Fan shroud |
CN111255735B (en) * | 2015-07-06 | 2022-02-08 | 浙江三花汽车零部件有限公司 | Electrically driven pump |
CN106337818A (en) * | 2015-07-07 | 2017-01-18 | 杭州三花研究院有限公司 | Electric drive pump |
JP2018132024A (en) * | 2017-02-17 | 2018-08-23 | エドワーズ株式会社 | Controller and vacuum pump device |
DE102021121171A1 (en) | 2021-08-15 | 2023-02-16 | Volkswagen Aktiengesellschaft | Radiator scoop for a motor vehicle and method for its manufacture |
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IT201800009082A1 (en) * | 2018-10-02 | 2020-04-02 | Vip Air Empowerment Srl | Fan for industrial use |
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Also Published As
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CN105074227B (en) | 2018-11-16 |
WO2014147678A1 (en) | 2014-09-25 |
JP2014181682A (en) | 2014-09-29 |
JP6126421B2 (en) | 2017-05-10 |
CN105074227A (en) | 2015-11-18 |
DE112013006329T5 (en) | 2015-11-05 |
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