JP2011228461A - Cooling device and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cooling device capable of effectively cooling a narrow space in which a cooling fan is difficult to install and an electronic device equipped with the cooling device.SOLUTION: The cooling device which cools heat generation parts mounted in the casing of the electronic device by outside air comprises: air suction mechanisms (cooling fans) 42a and 42b which sucks air into the casing 1 of the electronic device 100; and exhaust mechanisms (cooling fans) 41a and 41b for exhaustion from the casing 1. The air suction mechanisms and exhaust mechanisms are structured to respectively have a tubular case 6 serving as the passage of an air flow and having both ends opened and a fin 7 supported rotatably within the tubular case.

Description

  The present invention relates to a cooling device and an electronic device, and in particular, a cooling device for cooling a heat generating component in a small and thin electronic device or an electronic device in which a component is mounted in a narrow space, and an electronic device equipped with the cooling device It relates to equipment.

  In general, electronic devices are equipped with components that make up circuits according to their functions. However, heat-generating components such as semiconductor chips are dissipated using heat dissipation components such as heat sinks and cooling fans. ing.

  A cooling fan conventionally used is an axial fan having a large cross-sectional area with respect to the air supply direction, and heat is released by discharging air in the housing by the cooling fan.

  However, it is difficult to mount a conventional cooling fan having large fins in a small casing or to discharge air in a narrow space.

  FIG. 11 is a view showing an example of an electronic device equipped with a cooling fan 5 having a large cross-sectional area with respect to the blowing direction that has been used conventionally, FIG. 11A is a cross-sectional view, and FIG. It is a side view.

  In this electronic apparatus 200, a circuit board 2 is attached in a housing 1, and a heat generating component 3 is mounted on the circuit board 2. Examples of the heat generating component 3 include a calculation semiconductor chip such as a CPU, and a light emitting device such as a semiconductor laser and a light emitting element.

  In the housing 1 to which the circuit board 2 on which such a heat generating component 3 is mounted is mounted, a cooling fan 5 a is provided on the side of the housing 1 in order to avoid overheating of the heat generating component 3, and overheating occurs in the housing 1. The generated air Ha is forcibly exhausted, and the outside air Ca for cooling is introduced into the casing from the outside of the casing.

  However, the cooling fan 5a attached to the side surface of the casing has a large dimension in the rotation plane of the rotary fin, and in a small device having a casing with a small width and a small thickness, such a rotation is performed. It is difficult to use the cooling fan 5a having a large in-plane size.

  Therefore, a cooling device that can be mounted on a small device has been developed using a cylindrical casing and generating an air flow in the cylindrical casing. Discloses such a cooling device.

  For example, in the electronic device disclosed in Patent Document 1, a cooling device having a heat radiating body (cylindrical housing) is arranged so that heat of a heat-generating component mounted on the electronic device is transmitted. A fan having a plurality of wings or spiral wings in the longitudinal direction of the rotating shaft is rotatably accommodated inside the casing of the cooling device. Here, the cooling device is arranged such that the exhaust port of the heat radiating body faces the outside of the housing of the electronic device, and the air intake port is formed on a part of the side surface of the heat radiating body. In addition, the fan inside the heat radiator is directly driven by a motor or the like, whereby air inside the electronic device is taken into the heat radiator and released to the outside through the heat radiator to the electronic device.

  Moreover, the cooling device mounted on the electronic device disclosed in Patent Document 2 has a vent pipe connected so that heat of the heat-generating component is transmitted. The discharge port and the intake port of the vent pipe are provided on the side surface of the casing of the electronic device. A fan having a spiral wing is rotatably accommodated inside the vent pipe. This cooling device has a structure in which a fan is indirectly driven by a motor or the like to generate an air flow from the intake port to the exhaust port in the vent tube, and the vent tube itself is used as a heat sink. By cooling the vent pipe itself, the CPU connected to the vent pipe via the heat transfer body is cooled.

JP-A-11-214877 JP 2001-15965 A

  However, when the mounting density of components to be mounted in the housing of an electronic device increases and the housing itself becomes smaller, it becomes difficult to mount a cooling device for heat dissipation inside the housing. The need for a heat dissipating device with a small space for occupying and high heat dissipating efficiency increases.

  The present invention solves such a conventional problem, a cooling device capable of effectively cooling a narrow space where it is difficult to install a cooling fan, and an electronic device equipped with such a cooling device. The purpose is to obtain equipment.

  A cooling device according to the present invention is a cooling device that cools a heat-generating component mounted in a housing of an electronic device by outside air, and performs an intake mechanism that sucks air into the housing and exhausts air from the housing. An exhaust mechanism, and each of the intake mechanism and the exhaust mechanism is attached to the housing and serves as an air flow path. A cylindrical case having both ends opened, and a fin rotatably supported in the cylindrical case And an airflow flowing from one end side opening of the cylindrical case toward the other end side opening is generated by the rotation of the fin, thereby achieving the above object.

  It is preferable that the cooling device includes an intake side drive unit that rotates the fins of the intake mechanism and an exhaust side drive unit that rotates the fins of the exhaust mechanism.

  According to the present invention, in the cooling device, the intake side drive unit and the exhaust side drive unit are driven to rotate either one or both of the fins of the intake mechanism and the fins of the exhaust mechanism based on a control signal. It is preferable to have a control unit that controls the operation.

  According to the present invention, in the cooling device, the fin of the intake mechanism has a rotation shaft that rotatably supports the fin, and the intake side drive unit directly rotates the rotation shaft of the fin of the intake mechanism. The fin of the exhaust mechanism has a rotating shaft that rotatably supports the fin, and the exhaust-side drive unit directly drives and rotates the rotating shaft of the fin of the exhaust mechanism. It is preferable to be configured.

  In the cooling device according to the present invention, each of the fins of the intake mechanism and the exhaust mechanism is composed of one or more spiral plate members, and each of the intake mechanism and the exhaust mechanism is at least of the cylindrical case. A ring-shaped rotation support portion provided at one end and rotatably supporting an end portion of the fin; the ring-shaped rotation support portion; an outer ring member fixed to the cylindrical case; and the outer ring member It is preferable that the inner ring member is rotatably held with respect to the outer ring member, and one end of the fin is attached to the inner ring member.

  An electronic apparatus according to the present invention is an electronic apparatus including a housing that houses a circuit board and a cooling device that cools a heat-generating component mounted on the circuit board, and the housing includes the cooling device. As described above, one or more of the cooling devices of the present invention described above are mounted, whereby the above object is achieved.

  According to the present invention, in the electronic device, it is preferable that the heat generating component in the casing is cooled by performing either intake into the casing or exhaust from the casing using the cooling device.

  According to the present invention, in the electronic device, it is preferable that the heat generating component in the housing is cooled by performing both intake into the housing and exhaust from the housing using the cooling device.

  According to the present invention, in the electronic apparatus, the casing includes the intake mechanism and the exhaust mechanism that constitute one cooling device so that the heat generating component on the circuit board is located between the intake mechanism and the exhaust mechanism. It is preferable that it is attached to the side wall.

  According to the present invention, in the electronic device, the intake mechanism and the exhaust mechanism constituting the one cooling device are configured such that the outside air sucked into the casing by the intake mechanism passes over the heat generating component and the exhaust mechanism. It is preferable that the path discharged from the inside of the housing is arranged in a straight line.

  According to the present invention, in the electronic device described above, a plurality of heat generating components are mounted on the circuit board, and these heat generating components pass through the case where the outside air sucked into the case by the intake mechanism passes through the case. Thus, it is preferable that the exhaust mechanism be disposed on a path that is discharged from the housing.

  According to the present invention, in the electronic device, it is preferable that the casing has a planar rectangular shape, and a plurality of the plurality of heat generating components are arranged along opposite sides of the casing.

  According to the present invention, in the electronic device, the housing includes a cooling fan disposed on a side surface of the housing so as to be positioned in proximity to the heat generating component. The cooling fan is attached to the housing, and has an airflow path. A cylindrical case having both ends opened, and a fin rotatably supported in the cylindrical case, and air flow from one end side opening of the cylindrical case toward the heat generating component by rotation of the fin It is preferable that it is comprised so that may generate | occur | produce.

  According to the present invention, in the electronic device, a heat sink is provided on the heat generating component, and a cooling fan is disposed in the casing so as to be close to the heat generating component and the heat sink on the heat generating component. The cooling fan has a cylindrical case that is attached to the housing and serves as an airflow passage and that is open at both ends, and a fin that is rotatably supported in the cylindrical case. It is preferable that an air flow is generated from the opening at one end of the cylindrical case toward the heat generating component.

  An electronic apparatus according to the present invention is an electronic apparatus including a housing that houses a circuit board and a cooling device that cools a heat-generating component mounted on the circuit board, and the housing includes the cooling device. As described above, one or more of the cooling devices described above are mounted, and the control unit of the one or more cooling devices sends the intake side driving unit and the exhaust side driving unit of the cooling device to the intake air based on a control signal. Each of the fins of the mechanism and the fins of the exhaust mechanism is controlled to rotate or stop, and the control unit controls the one or more fins according to the heat generation state of the heat generating component in the housing. By changing the number of cooling devices to be driven in the cooling device and the rotation speed of the fans in the intake mechanism and the exhaust mechanism in the cooling device to be used, the amount of air blown into the housing is adjusted, and the housing Temperature And it adjusts the above-described object can be achieved.

  Next, the operation of the present invention will be described.

  The present invention includes an intake mechanism that performs intake to the housing of the electronic device and an exhaust mechanism that exhausts from the housing. The intake mechanism and the exhaust mechanism serve as airflow paths at both ends. Since it has the structure which has the cylindrical case opened and the fin supported rotatably in this cylindrical case, the lump of the airflow which moves a cylindrical case by rotation of a fin can be formed. For this reason, in the intake mechanism, it is possible to give inertia to the air mass in the cylindrical case so that the air current can reach farther when the air current is discharged out of the cylindrical case. Further, in the exhaust mechanism, the momentum of air sucked into the cylindrical case of the exhaust mechanism in the casing can be increased by giving inertia to the air mass in the cylindrical case. This makes it possible to effectively form a highly viscous air flow in a housing that forms a narrow space, and to more effectively reduce the air cooling of heat-generating components in the housing of an electronic device that is a narrow space. It can be carried out.

  Further, since the housing is provided with the intake mechanism and the exhaust mechanism, the flow of air supplied into the housing and the flow of air discharged from the housing can be formed at the same time. In addition, it is possible to more effectively cool the heat generating components in the casing of the electronic device which is a narrow space.

  In the present invention, since the intake mechanism and the exhaust mechanism that constitute the cooling device have a cylindrical case and a fin that is rotatably held therein, the diameter and length of the cylindrical case are reduced. However, in the cylindrical case, it is possible to give inertia to the mass of airflow, and it is possible to avoid an extreme decrease in the amount of blown air. For this reason, even if the space of the attachment part of the cooling device in the narrow housing which mounted the heat generating part is small, this cooling device can be mounted.

  Furthermore, the cooling device of the present invention is equipped with a plurality, and by adjusting the amount of air blown into the casing or the amount of exhaust, not only cooling the heat-generating parts, but also managing the temperature inside the casing, It becomes possible to carry out more precisely than a conventional blower fan.

  As described above, according to the present invention, the electronic device includes the intake mechanism that performs intake to the housing of the electronic device and the exhaust mechanism that exhausts from the housing. Since it has a structure that has a cylindrical case that is open at both ends to be a passage and a fin that is rotatably supported in the cylindrical case, it is difficult to install a cooling fan with a large dimension in the fin rotation surface. There is an effect that it is possible to effectively cool the space.

1A and 1B are diagrams illustrating an electronic apparatus according to Embodiment 1 of the present invention, in which FIG. 1A shows a structure of a longitudinal section of the electronic apparatus, and FIG. 1B shows a structure of a transverse section of the electronic apparatus. Show. FIG. 2 is a diagram for explaining a cooling device mounted on the electronic apparatus according to the first embodiment of the present invention, and shows a cross-sectional structure of a cooling fan used in the cooling device. FIG. 3 is a diagram illustrating another configuration example of the cooling fan used in the cooling device mounted on the electronic apparatus according to the first embodiment of the present invention, and shows a cross-sectional structure of the cooling fan. FIG. 4 is a diagram for explaining the configuration of the driving unit of the cooling fan shown in FIG. 3, FIG. 4 (a) partially shows a cross-sectional structure parallel to the rotation axis, and FIG. A cross-sectional structure perpendicular to the rotation axis is shown. FIG. 5 is a diagram illustrating another configuration example of the cooling fan used in the cooling device mounted on the electronic apparatus according to the first embodiment of the present invention. FIG. 5A is a cross-sectional structure parallel to the rotation axis. FIG. 5B shows a cross-sectional structure perpendicular to the rotation axis. 6A and 6B are diagrams for explaining an electronic device according to Embodiment 2 of the present invention. FIG. 6A shows a vertical cross-sectional structure of the electronic device, and FIG. 6B shows a cross-sectional structure of the electronic device. Show. 7A and 7B are diagrams for explaining an electronic apparatus according to Embodiment 3 of the present invention. FIG. 7A shows a vertical cross-sectional structure of the electronic apparatus, and FIG. 7B shows a cross-sectional structure of the electronic apparatus. Show. FIG. 8 is a diagram for explaining an electronic apparatus according to Embodiment 4 of the present invention, and shows a cross-sectional structure of the electronic apparatus. FIG. 9 is a view for explaining an electronic apparatus according to Embodiment 5 of the present invention, and shows a structure of a longitudinal section of the electronic apparatus. FIG. 10 is a view for explaining an electronic apparatus according to Embodiment 6 of the present invention, and shows a structure of a longitudinal section of the electronic apparatus. FIG. 11 is a diagram for explaining an electronic device in which a conventional cooling fan is mounted.

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, the same members are denoted by the same reference numerals, and description thereof will not be repeated.
(Embodiment 1)
1A and 1B are diagrams illustrating an electronic apparatus according to Embodiment 1 of the present invention, in which FIG. 1A shows a structure of a longitudinal section of the electronic apparatus, and FIG. 1B shows a structure of a transverse section of the electronic apparatus. Show.

  The electronic device 100 according to the first embodiment includes a casing 1 that houses the circuit board 2 and a cooling device that cools the heat-generating component 3 mounted on the circuit board 2.

  Here, the housing 1 is provided with two cooling devices. The first cooling device includes an intake mechanism 42a that performs intake into the enclosure, and an exhaust mechanism 41a that performs exhaust from the enclosure. The second cooling device includes an intake mechanism 42b that performs intake to the enclosure and an exhaust mechanism 41b that exhausts the enclosure.

  Here, the intake mechanisms 42a and 42b and the exhaust mechanisms 41a and 41b have the same structure, and each constitutes one cooling fan.

  FIG. 2 is a diagram for explaining a cooling device mounted on the electronic apparatus 100 according to the first embodiment, and shows a cross-sectional structure of a cooling fan (intake mechanism or exhaust mechanism) used in the cooling device.

  For example, the exhaust mechanism (cooling fan) 41 a is attached to the housing 1 and serves as an air flow path. The cylindrical case 6 having both ends opened, and the fin 7 rotatably supported in the cylindrical case 6. The air flow is generated from one end side opening of the cylindrical case toward the other end side opening by the rotation of the fin 7.

  In addition, each cooling device has an intake side or exhaust side drive unit that rotates the fins of the intake mechanism or the exhaust mechanism. The fin 7 has a rotation shaft 8 that rotatably supports the fin 7, and the rotation shaft 8 is rotatably supported by bearing portions (supports) 9 a and 9 b attached to both ends of the cylindrical case 6. Has been. The bearing portions 9a and 9b have a structure that does not hinder the air flow, for example, a structure having an air circulation opening.

  Further, the drive unit of the exhaust mechanism is configured to indirectly drive the rotation shaft of the fin of the exhaust mechanism.

  For example, in the drive portion of the exhaust mechanism (cooling fan) 41a, as shown in FIG. 2, a pulley 10a is attached to the rotating shaft 8 of the fin 7, and this pulley 10a is driven by a belt member 10c. It is connected to a drive pulley 10b attached to 150a. The motor 150 is driven and controlled by a control signal from the control unit 160. The pulley 10 also has a structure that does not hinder the air flow, for example, a structure having an air circulation opening.

  That is, in the cooling fan 41a shown in FIG. 2, the rotating shaft 8 of the helical fin 7 is housed in the axial direction in the cylindrical case 6 whose both ends are the intake port or the exhaust port. The support body 9 which supports without being provided is provided. In addition, a drive portion 10a such as a pulley is provided to indirectly rotate the rotation shaft. Although the drive part 10a is shown here as a pulley, it may be a gear or the like, and the drive part 10a may be connected to a rotational drive unit such as a motor via a belt or a gear.

  Next, the operation will be described.

  In the electronic device 100 having such a configuration, during the operation, the fins 7 of the intake mechanisms (cooling fans) 42a and 42b and the exhaust mechanisms (cooling fans) 41a and 41b are rotated by the motors 150 corresponding to the respective cooling fans. As shown in FIG. 1, air is taken into the housing 1 of the electronic device 100 by the intake mechanisms (cooling fans) 42a and 42b, and the taken-in air is exhausted by the exhaust mechanisms (cooling fans) 41a and 41b. It will be discharged from the housing 1.

  Thereby, heat dissipation of the heat generating component 3 mounted on the circuit board 2 in the housing 1 is performed.

  For example, when there is a circuit board 2 constituting an electronic circuit and a heat generating component 3 mounted on the circuit board 2 in a narrow space inside the housing 1 of the electronic device, the cross-sectional area perpendicular to the intake or exhaust direction is small. One or a plurality of cooling fans are mounted on the intake side and the exhaust side, and air is caused to flow inside the housing 1, thereby cooling the heat generating components and managing the temperature of the mounted components.

  As described above, in the first embodiment, the intake mechanisms (cooling fans) 42a and 42b that intake air to the casing 1 of the electronic device 100, and the exhaust mechanisms (cooling fans) 41a and 41b that exhaust the casing 1 are exhausted. The intake mechanism and the exhaust mechanism are structured to have a cylindrical case 6 having both ends opened as airflow passages and fins 7 supported rotatably in the cylindrical case. A lump of airflow that moves through the cylindrical case 6 by the rotation of the fins 7 can be formed. For this reason, in the intake mechanisms 42a and 42b, it is possible to make the airflow mass inertia in the cylindrical case 6 so that the airflow can reach farther when the airflow is discharged out of the cylindrical case 6. Become. Further, in the exhaust mechanisms (cooling fans) 41a and 41b, the cylindrical case 6 gives inertia to the mass of the air flow, thereby increasing the momentum of the air sucked into the cylindrical case 6 of the exhaust mechanism in the housing 1. Can do. As a result, a highly viscous air flow can be effectively formed in the housing that forms the narrow space, and the heat-generating component 3 in the housing 1 of the electronic device 100 that is the narrow space can be air-cooled. It can be done more effectively.

  Further, since the housing 1 is provided with the intake mechanism and the exhaust mechanism, the flow of air supplied into the housing 1 and the flow of air discharged from the housing can be formed simultaneously. This also makes it possible to more effectively air-cool the heat generating components in the housing of the electronic device, which is a narrow space.

  In addition, since the intake mechanisms 42a and 42b and the exhaust mechanisms 41a and 41b constituting the cooling device have the cylindrical case 6 and the fins 7 that are rotatably held therein, the diameter and length of the cylindrical case Even if the length is reduced, in the cylindrical case, inertia of the air mass can be imparted, and an extreme decrease in the air flow rate can be avoided. For this reason, even if the space of the attachment part of the cooling device in the narrow housing 1 in which the heat generating portion 3 is mounted is small, the cooling device can be mounted.

  In addition, a plurality of cooling devices are mounted and the amount of air blown into the housing or the amount of exhaust is adjusted to not only cool the heat-generating parts but also control the temperature inside the housing. It becomes possible to carry out more precisely than a fan.

  As described above, the cooling fan of the present embodiment has a small cross-sectional area perpendicular to the intake or air supply direction even in a narrow housing in which a cooling fan having a large area with respect to the blowing direction that has been conventionally used cannot be mounted. Mounting is possible, and the amount of blast can be secured by using a plurality.

  In addition, in the said Embodiment 1, although the structure shown in FIG. 2 as a cooling fan was shown, the structure of a cooling fan is not limited to this.

  FIG. 3 is a diagram illustrating another configuration example of the cooling fan used in the cooling device mounted on the electronic apparatus according to the first embodiment, and illustrates a cross-sectional structure of the cooling fan.

  In this cooling fan 51, a rotating shaft 8 having spiral fins 7 in the axial direction is housed in a cylindrical case 6 whose both ends are opened as an intake port or an exhaust port, and this rotating shaft is supported without impeding air flow. A supporting body 9a is provided. Here, a ring-shaped motor 11 that directly rotates and drives the fins held by the cylindrical case 6 is used as a drive unit that drives the fins.

  FIG. 4 is a diagram for explaining the configuration of the driving unit of the cooling fan shown in FIG. 3, FIG. 4 (a) partially shows a cross-sectional structure parallel to the rotation axis, and FIG. A cross-sectional structure perpendicular to the rotation axis is shown.

  Here, the ring-shaped motor 11 includes a ring-shaped motor case 11a, a plurality of electromagnets 11b arranged at predetermined intervals along the outer peripheral edge of the motor case 11a, and a cylindrical shape into which the ring-shaped motor case 11a is fitted. A conductive ring-shaped movable member 6c is rotatably held at a peripheral end 6a of the case 6 via a ball bearing 6b. The inside of the ring-shaped motor case 11a is an air passage opening 11c.

  In the cooling fan 51 having such a configuration, the ring-shaped movable member 6c is rotated by energizing the plurality of electromagnets 11b by a drive unit (not shown) of the ring-shaped motor 11, thereby rotating the fins 7. Rotating drive.

  FIG. 5 is a diagram illustrating another configuration example of the cooling fan used in the cooling device mounted on the electronic apparatus according to the first embodiment. FIG. 5A is a partial cross-sectional structure parallel to the rotation axis. FIG. 5B shows a cross-sectional structure perpendicular to the rotation axis.

  The cooling fan 61 shown in FIG. 5 is different from the cooling fans 41a and 51 shown in FIGS. 2 and 3 in that the fin is not provided with a rotating shaft.

  That is, in the cooling fan 61, the spiral fin 12 formed of one or a plurality of plates is rotatably attached to the cylindrical case 6 having both ends serving as an intake port or an exhaust port. Specifically, for attachment of the fins 12, rotating devices 13 and 16 such as bearings provided in the cylindrical case 6 are used. Further, in order to indirectly drive the fins 12, for example, a driving portion 14 such as a pulley is fixed to the movable portion of the rotating device 16.

  Here, the rotating device 13 includes an outer peripheral ring member 13a, and an inner peripheral ring member 13b that is rotatably mounted via a ball bearing inside the outer ring member 13a. The member 13a is fixed to one end of the cylindrical case, and one end of the fin 12 is fixed to the inner ring member 13b. The rotating device 16 includes an outer ring member 16a and an inner ring member 16b that is rotatably mounted via a ball bearing inside the outer ring member 16a. The member 16a is fixed to the other end side of the cylindrical case, and the other end of the fin 12 is fixed to the inner peripheral ring-shaped member 16b.

  Further, a pulley (driving portion) 14 is attached to the tip of the inner ring member 16b. The pulley 14 is connected to rotation driving means such as a motor via a belt or the like and is driven to rotate. As a method of driving the fins 12, a method of directly driving with, for example, the ring motor 11 as described with reference to FIG. 3 may be used.

In the first embodiment, the electronic device housing 1 having a simple rectangular parallelepiped shape is provided with the first and second cooling devices, that is, two cooling fans on the air supply side (intake side). Although 42a and 42b are provided, two cooling fans 41a and 41b are provided on the exhaust side, and a total of four cooling fans are used to cool the heat generating components, the present invention is not limited to this. For example, there may be only one cooling device. In this case, the electronic device is provided with one cooling fan on the air supply side (intake side) and one cooling fan on the exhaust side, for a total of two cooling devices. It becomes the structure which cools a heat-emitting component using a fan.
(Embodiment 2)
6A and 6B are diagrams for explaining an electronic device according to Embodiment 2 of the present invention. FIG. 6A shows a vertical cross-sectional structure of the electronic device, and FIG. 6B shows a cross-sectional structure of the electronic device. Show.

  The electronic device 100a of the second embodiment shown in FIG. 6 differs from the electronic device 100 of the first embodiment shown in FIG. 1 in that the cooling fans 41a, 41b, 42a, and 42b are attached to the housing 1 of the electronic device. Is different.

In other words, in the electronic device 100 of the first embodiment shown in FIG. 1, the cooling fans 41a, 41b, 42a, and 42b are arranged to protrude from the side surface of the casing 1 of the electronic device. In the electronic device 100a, the cooling fans 41a, 41b, 42a, and 42b are different in that they are attached to the housing 1 of the electronic device so that the entire fan is accommodated inside the housing. The electronic device 100a of the second embodiment has the same configuration as the electronic device 100 of the first embodiment in other respects.
(Embodiment 3)
7A and 7B are diagrams for explaining an electronic apparatus according to Embodiment 3 of the present invention. FIG. 7A shows a vertical cross-sectional structure of the electronic apparatus, and FIG. 7B shows a cross-sectional structure of the electronic apparatus. Show.

  The electronic device 100b of the third embodiment shown in FIG. 7 differs from the electronic device 100 of the first embodiment shown in FIG. 1 in that three heat generating members 3 are arranged in a straight line on the circuit board 2. . Other configurations in the third embodiment are the same as those in the first embodiment.

That is, in the third embodiment, the intake mechanisms (cooling fans) 42a and 42b and the exhaust mechanisms (cooling fans) 41a and 41b constituting one cooling device are configured so that the outside air sucked into the housing by the intake mechanism is The paths that pass over the plurality of heat generating components 3 and are discharged from the housing by the exhaust mechanism are arranged in a straight line.
(Embodiment 4)
FIG. 8 is a diagram for explaining an electronic apparatus according to Embodiment 4 of the present invention, and shows a cross-sectional structure of the electronic apparatus.

  The electronic device 100c according to the fourth embodiment is a liquid crystal television, and the casing 1c of the liquid crystal television has a planar rectangular shape, and a first heating component such as a light emitting element is mounted in the casing 1c. The second circuit boards 2a and 2b are disposed adjacent to the opposite sides of the casing, and therefore a plurality of heat generating components are arranged along the opposite sides of the casing.

  Here, the heat generating component 3 on the first circuit board 2a is cooled by the first and second cooling devices, and the heat generating component 3 on the second circuit board 2b is cooled by the third and fourth cooling devices. It is like that.

  That is, here, the first to fourth cooling devices have intake mechanisms (cooling fans) 44a to 44d and exhaust mechanisms (cooling fans) 43a to 43d, respectively.

In the electronic device 100 having such a configuration, it is possible to effectively cool the heat-generating component disposed along the opposite side in a wide and thin flat rectangular casing.
(Embodiment 5)
FIG. 9 is a view for explaining an electronic apparatus according to Embodiment 5 of the present invention, and shows a structure of a longitudinal section of the electronic apparatus.

  The electronic device 100d according to the fifth embodiment has a total of four cooling fans, two on the air supply side (intake side) and two on the exhaust side. The cooling fan 15c is provided so as to be positioned close to the heat generating component 3. This cooling fan 15 has the same configuration as the cooling fan shown in FIG. 2 or FIG.

In other words, in the fifth embodiment, the cooling fan 15c provided on the side surface of the casing 17 directly blows air to a part having a particularly large amount of heat generation such as a CPU in the casing in order to enhance the heat dissipation effect. Is implemented.
(Embodiment 6)
FIG. 10 is a view for explaining an electronic apparatus according to Embodiment 6 of the present invention, and shows a structure of a longitudinal section of the electronic apparatus.

  The electronic device 100e of the sixth embodiment is similar to the electronic device 100 of the first embodiment having two cooling fans, two on the air supply side (intake side) and two on the exhaust side. (Radiating fin) 18 is provided, and a cooling fan 15d is disposed in the casing so as to be close to the heat generating component and the heat sink thereon.

  This cooling fan 15d has the same configuration as the cooling fan shown in FIG. 2 or FIG.

  In other words, the cooling fan 15d has a cylindrical case that is attached to the housing and serves as an airflow path and that is open at both ends, and a fin that is rotatably supported in the cylindrical case. Thus, an airflow is generated from the opening at one end of the cylindrical case toward the heat generating component 3 and the heat sink (radiating fin) 18 thereon.

  The electronic device 100e of this embodiment has a total of five cooling fans, two on the air supply side (intake side), two on the exhaust side, and one in the housing, relative to the simple rectangular parallelepiped casing 1. Is implemented.

  A heat sink (radiation fin) 18 made of metal or the like may be mounted on a part having a particularly large amount of heat generation such as a CPU. However, if heat dissipation is still insufficient, as shown in the sixth embodiment, By directly blowing air to the heat generating component or the heat sink (heat radiating fin) 18 mounted on the heat generating component by the cooling fan 15d, it is possible to efficiently enhance the heat dissipation effect of the component.

  In addition, by blowing air directly from the cooling fan to the radiating fins mounted on the parts, it is possible to adopt smaller radiating fins than when not blowing directly from the cooling fan, which limits the use of heat generating parts in a narrow housing. It can be expected to be alleviated.

  In each of the above embodiments, by changing the number of cooling fans mounted and the number of rotations of the cooling fan fins, it is possible to adjust the temperature in the housing and manage the function stability of the electronic device. Needless to say.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. It is understood that the patent documents cited in the present specification should be incorporated by reference into the present specification in the same manner as the content itself is specifically described in the present specification.

  In the field of a cooling device for cooling a heat generating component in a small and thin electronic device or an electronic device in which a component is mounted in a narrow space, the present invention provides a cooling fan having a large size in the fin rotation surface. A cooling device capable of effectively cooling a difficult narrow space is obtained, and the cooling device of the present invention is useful as a cooling device such as a liquid crystal television having a thin casing.

DESCRIPTION OF SYMBOLS 1, 17 Housing 2 Circuit board 3 Heat-generating component 5 Cooling fan 6 Cylindrical case 7, 12 Fin 8 Rotating shaft 9 Support body 10a Drive part 11 Ring motor 13 Rotating device 14 Drive part (pulley)
15a-15d, 41a-44a, 41b-44b, 51, 61 Cooling fan 16 Rotating device 18 Heat sink (radiating fin)
100, 100a to 100e, 200 Electronic device 150 Motor 160 Control unit

Claims (15)

A cooling device that cools a heat-generating component mounted in a housing of an electronic device with outside air,
An intake mechanism for inhaling the enclosure;
An exhaust mechanism for exhausting air from the enclosure,
The intake mechanism and the exhaust mechanism are respectively
A cylindrical case attached to the housing and serving as an airflow passage, with both ends open;
A fin that is rotatably supported in the cylindrical case, and is configured to generate an airflow flowing from one end side opening of the cylindrical case toward the other end side opening by rotation of the fin.
Cooling system. The cooling device according to claim 1, wherein
An intake side drive unit for rotating fins of the intake mechanism;
An exhaust-side drive unit that rotates the fins of the exhaust mechanism;
Cooling system. The cooling device according to claim 2, wherein
A controller that controls the intake side drive unit and the exhaust side drive unit based on a control signal so that either one or both of the fins of the intake mechanism and the fins of the exhaust mechanism are driven to rotate; Cooling system. The cooling device according to claim 2, wherein
The fin of the intake mechanism has a rotation shaft that rotatably supports the fin,
The intake side drive unit is configured to directly rotate and drive the rotation shaft of the fin of the intake mechanism,
The fin of the exhaust mechanism has a rotating shaft that rotatably supports the fin,
The exhaust side drive unit is configured to directly rotate and drive the rotation shaft of the fin of the exhaust mechanism. The cooling device according to claim 2, wherein
Each of the fins of the intake mechanism and the exhaust mechanism is composed of one or more spiral plate members,
Each of the intake mechanism and the exhaust mechanism has a ring-shaped rotation support portion that is provided at at least one end of the cylindrical case and rotatably supports an end portion of the fin,
The ring-shaped rotation support part is
An outer ring member fixed to the cylindrical case;
An inner ring member rotatably held with respect to the outer ring member inside the outer ring member;
The cooling device, wherein one end of the fin is attached to the inner ring member. An electronic device comprising a housing that houses a circuit board and a cooling device that cools a heat-generating component mounted on the circuit board,
Electronic equipment in which one or more cooling devices according to any one of claims 1 to 5 are mounted in the casing as the cooling device. The electronic device according to claim 6,
An electronic device that cools a heat-generating component in the casing by performing either intake into the casing or exhaust from the casing using the cooling device. The electronic device according to claim 6,
An electronic device that cools a heat-generating component in the housing by performing both intake into the housing and exhaust from the housing using the cooling device. The electronic device according to claim 6,
An intake mechanism and an exhaust mechanism that constitute one cooling device are an electronic device attached to the side wall of the casing so that a heat generating component on the circuit board is located between the intake mechanism and the exhaust mechanism. machine. The electronic device according to claim 9,
The intake mechanism and the exhaust mechanism constituting the one cooling device are:
A cooling device, wherein a path through which the outside air sucked into the casing by the intake mechanism passes over the heat generating component and is discharged from the casing by the exhaust mechanism is arranged in a straight line. The electronic device according to claim 10,
A plurality of heat generating components are mounted on the circuit board,
These heat generating components are arranged on a path through which the outside air sucked into the casing by the intake mechanism passes through the casing and is discharged from the casing by the exhaust mechanism. The electronic device according to claim 11,
The housing has a planar rectangular shape;
The electronic device, wherein the plurality of heat generating components are arranged along opposite sides of the housing. The electronic device according to claim 9,
A cooling fan disposed on a side surface of the housing so as to be positioned close to the heat-generating component;
The cooling fan is
A cylindrical case attached to the housing and serving as an airflow passage, with both ends open;
A fin that is rotatably supported in the cylindrical case, and is configured to generate an airflow from one end side opening of the cylindrical case toward the heat generating component by the rotation of the fin.
Electronics. The electronic device according to claim 9,
A heat sink is provided on the heat generating component,
Inside the housing, a cooling fan is disposed so as to be close to the heat-generating component and the heat sink thereon,
The cooling fan is
A cylindrical case attached to the housing and serving as an airflow passage, with both ends open;
A fin that is rotatably supported in the cylindrical case, and is configured to generate an airflow from one end side opening of the cylindrical case toward the heat generating component by the rotation of the fin.
Electronics. An electronic device comprising a housing that houses a circuit board and a cooling device that cools a heat-generating component mounted on the circuit board,
One or more cooling devices according to claim 3 are mounted on the casing as the cooling device,
The control unit of the one or more cooling devices includes:
The intake side drive unit and the exhaust side drive unit in the cooling device are controlled based on a control signal so that each of the fins of the intake mechanism and the fins of the exhaust mechanism is rotationally driven or stopped. ,
Under the control of the control unit, the number of cooling devices to be driven in the one or more cooling devices and the number of fans in the intake and exhaust mechanisms in the cooling device to be used are determined according to the heat generation state of the heat generating components in the housing. An electronic device that adjusts the amount of air blown into the housing by changing the number of rotations to adjust the temperature inside the housing.

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