JPH07162180A - Cooling structure for electronic apparatus - Google Patents

Abstract

PURPOSE:To cool about uniformly all the printed boards stored in a printed- board device, in a cooling structure for electronic apparatuses. CONSTITUTION:In a cooling structure for electronic apparatuses, a printed-board device 10 for storing printed boards 15 in parallel with each other in a box type bin 11 is mounted on a rack, and the printed boards 15 are cooled by a fan device 50 mounted on the rack part present under the printed-board device 10. In this cooling structure, the fan device 50 comprises a case 51 for storing a plurality of fan units 55 in an insert-able way, a shaft 31 which is held in the central part of the top or rear surface of the case 51 and whose front and rear end parts are pivoted respectively by the members provided respectively in the front and rear parts of the rack, and a motor 30 for giving a rotational motion to the shaft 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for electronic equipment in which a fan device is mounted on a lower portion of a printed board device to cool a printed board housed in the printed board device.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of an electronic device, FIG. 4 is a perspective view of a conventional fan device, and FIG. 5 is a sectional view of a conventional example.

In the drawing, 1 is a printed board device 10 on a rack 1A.
It is an electronic device that is equipped with multiple stages. Printed circuit board equipment 10
Is a housing 11 in which a large number of printed boards 15 are accommodated in parallel.

Reference numeral 11 is composed of a lower plate, left and right side plates, and a backboard provided with a backboard connector.
It is a box-shaped housing with an open front. The right and left side plates of the housing 11 are each provided with a fixing member having an angle-shaped plane, and the fixing members are brought into contact with the front gantry of the rack 1A and fixed to the rack 1A with bolts.

The housing 11 is provided with a plurality of guide rails on the inside of each of the lower plate and the upper plate by burring or the like. By inserting a pair of upper and lower guide rails into each of the upper and lower side edges of the printed board 15 and plugging the printed board connector into the opposite backboard connector, a large number of printed boards 15 are arranged in parallel with the housing 11. The printed board device 10 is configured to be housed.

By arranging guide rails by burring inside the lower plate and the upper plate, ventilation holes are formed in the upper and lower side plates of the casing 11, respectively.

On the other hand, an individual front plate is attached to the front side edge of each printed board 15. Therefore, when the printed board 15 is completely attached to the housing 11, the individual front boards are juxtaposed side by side.
The front opening of 11 is closed.

There is also one in which each printed board 15 is not provided with an individual front board, but a front board is attached to the opening side of the housing 11 to close the front opening. Reference numeral 2 denotes a fan device which is mounted at a location below the printed board device 10.

As shown in detail in FIG. 4, the fan device 2 is composed of a case 21 fixed to the rack 1A and a plurality of fan units 25 which are inserted into and removed from the case 21 in parallel.

The case 21 is a shallow box shape having ventilation windows 22 on the bottom plate and the upper plate, which have the same shape as the plan view of the housing 11, and the front surface is open. A member is attached, this fixing member is brought into contact with the front post of the rack 1A, and is fixed to the rack 1A using bolts.

Each fan unit 25 has a plurality of fans 26 mounted in the front-rear direction. Attach the handle for pulling out the fan unit 25 from the case 21 to the front plate of the fan unit 25, and
It has a switch that drives the fan 26 installed in.

The fan 26 is of a so-called axial flow type in which a fan motor 27 with an impeller is mounted on the shaft center of a rectangular frame member. When the fan motor 27 is driven, an impeller attached to the outer periphery of the fan motor 27 rotates, sucking air from below the fan 26 in parallel with the rotation axis of the fan motor 27, and expanding the cone-shaped air upward. Blow a stream.

On the other hand, as shown in FIG.
Has a suction port 3 on the front side of the lowermost part of the rack 1A. The intake port 3 may be of an intake / exhaust air unit type. The air intake / exhaust unit type means that the frame attached to the rack 1A is divided into two spaces, diagonally above and diagonally below, by providing a shielding plate so that it is located diagonally to the front and downward in a side view. It was
The air intake / exhaust unit has a front plate provided with a window for sucking cool air, and a rear plate provided with a window for discharging warm air.

The electronic device 1 comprises a rack 1A installed on the floor, an intake port 3, a fan device 2, a printed circuit board device 10 mounted in multiple stages, a fan device 2 and another It is configured by stacking the printed board devices 10 in this order.

In the electronic device 1 configured as described above, when the fan units 25 of the fan device 2 are driven,
As shown in FIG. 5, each fan rotates to suck the outside air from the lower side of the fan device 2 and blow it to the upper side,
Air is sent into the printed board device 10.

The air blown into the printed board device 10 is
It passes between the respective printed boards 15, rises while taking heat, and is discharged to the outside of the printed board device 10. Therefore,
The printed board 15 housed in the printed board device 10 is cooled.

A plurality of fan units 25 are installed in the case 21.
When the fan 26 of the fan unit 25 breaks down, there is an advantage that the broken fan 26 can be easily replaced while the case 21 remains fixed to the rack 1A.

[0018]

By the way, each fan housed in the fan device is of the axial flow type, and the outer diameter of the fan motor mounted on the axial center of the rectangular frame member is large.

Therefore, the wind speed is weak in the cylindrical space formed on the extension line of the shaft of the fan motor. As a result, the conventional electronic device has a problem that the cooling performance of the printed board housed directly above the fan motor is poor.

The present invention has been made in view of the above points, and an object thereof is to provide a cooling structure for an electronic device capable of cooling all printed boards housed in a printed board device substantially uniformly.

[0021]

In order to achieve the above-mentioned object, the present invention mounts a printed board device 10 in which a printed board 15 is accommodated in parallel in a box-shaped casing 11 on a rack, and prints. In a cooling structure of an electronic device in which a fan device 50 is mounted below the plate device 10 to cool the printed board 15, the fan device houses a plurality of fan units 55 in a freely insertable and removable manner, and a top surface of the case 51. Of the shaft 31 and the shaft 31 whose front end is pivotally supported by a member provided at the front of the rack and whose rear end is pivotally supported by a member provided at the rear of the rack.
The motor is provided with a motor 30 for imparting a rotational movement to the case 51, and the case 51 is configured to swing by rotating the motor 30.

Alternatively, the fan device 50 holds the case 51 in which a plurality of fan units 55 are removably accommodated, and the central portion of the upper surface or the lower surface of the case 51, and the front end portion is provided at the front portion of the rack. Shaft 31, which is pivotally supported by a member whose rear end is pivotally supported by a member provided at the rear portion of the rack, a motor 30 which imparts a rotational motion to the shaft 31, and a case 51 which is swingably accommodated. The frame 51 is provided with a frame-shaped casing 60, and the case 51 oscillates by rotating the motor 30. The frame-shaped casing 60 has an upper end surface on the lower end surface of the printed board device 10. It shall be mounted on the rack so as to be in close contact with it.

Alternatively or additionally, as illustrated in FIG. 2, a temperature sensor 70 mounted on the selected printed board 15,
Based on the information from the temperature sensor 70, a control unit that controls the rotation of the motor 30 is provided, and the control unit controls the case 51 to incline toward the printed board 15 until the selected printed board 15 has a predetermined temperature or lower. The rotation of the motor 30 is stopped so as to maintain the state.

[0024]

According to the present invention, the case in which the fan unit is housed oscillates in the left-right direction by the motor, so that the blowing direction of each fan oscillates within an angle about the vertical axis.

Accordingly, since the air is also sent to the printed board housed directly above the fan motor, all the printed boards housed in the printed board device are cooled substantially uniformly. Also,
The fan unit is housed in a frame-shaped housing so that the upper end surface is in close contact with the lower end surface of the printed circuit board device so that the fan unit can be swung freely. Instead, the entire amount of blast is supplied into the printed board device.

Therefore, the cooling efficiency of the printed board is increased. On the other hand, select a printed circuit board with high heat-generating components or a printed circuit board directly above the fan motor, and mount a temperature sensor on the printed circuit board. Is leaning.

Therefore, since the cooling air continues to be blown to the printed board during the inclined time, it is possible to prevent the printed board from overheating.

[0028]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a sectional view of the embodiment of the present invention. As shown in FIGS. 1 and 2, the electronic apparatus according to the present invention includes a printed board device 10 in which a large number of printed boards 15 are housed in parallel in a box-shaped casing 11.
It is mounted on 1A, and a fan device 50 is mounted below the printed board device 10 to cool the printed board 15 housed in the printed board device 10.

The printed board device 10 will be described in detail below. A box-shaped housing 11 with a front opening, consisting of a lower plate, left and right side plates, and a backboard with a backboard connector, has a plurality of guide rails inside each of the lower plate and the upper plate. By providing burring and the like, ventilation holes are respectively formed in the upper and lower side plates.

By selecting a pair of upper and lower guide rails and inserting the upper and lower side edges of the printed board 15 into each other, and plugging the printed board connectors into the opposite backboard connectors, a large number of printed boards 15 can be accommodated in the housing 11. Are housed in parallel with each other.

In this printed board device 10, the individual front boards are attached to the front side edges of the respective printed boards 15, or the front boards are attached to the opening side of the housing 11 to close the front opening of the housing 11. I have to.

Reference numeral 50 denotes a fan device mounted below the printed board device 10. The fan device 50 includes a case 51 that accommodates a plurality of fan units 55 so that the fan unit 55 can be inserted and removed, a shaft 31 that holds the case 51 so that the case 51 can swing in the left-right direction, and a motor 30 that imparts a swinging motion to the shaft 31. ing.

The embodiment shown in FIGS. 1 and 2 further comprises a frame-shaped casing 60 for accommodating the case 51. The frame-shaped casing 60 is inserted into the frame 1A and attached, and the case 51 is housed in the frame-shaped casing 60 so that the case 51 can swing.

The case 51 is a shallow box having a bottom plate and an upper plate which are similar to the shape of the housing 11 in plan view and are sufficiently smaller than the housing 11 and have ventilation windows 52 on the front surface. The fan unit 55 that is inserted into and removed from the case 51 and is housed in parallel is equipped with a plurality of fans 56 in the front-rear direction. Attach the handle for pulling out the fan unit 55 from the case 51 to the front plate of the fan unit 55, and
It is equipped with a switch that drives the fan 56 mounted on the 55.

The fan 56 is of a so-called axial flow type in which a fan motor 57 with an impeller is mounted on the axial center of a rectangular frame member. The frame-shaped casing 60 is a combination of a channel-shaped front frame member, a rear frame member, and a pair of left and right side frame members, each having a frame shape. The shape and size are equal, and the height is larger than the height of the case 51, so that the case 51 mounted inside does not hinder the swinging motion in the left-right direction.

Since the frame-shaped casing 60 is a combination of channel-shaped frame members, the upper and lower surfaces have a case.
A window 61 is formed that is substantially equal to the shape of the plan view 51. Further, the frame-shaped casing 60 is provided with a fixing member 69 having a plane shape of an angle on each of the left and right side frame members.

The upper end surface of the frame-shaped casing 60 is the printed board device 10
The frame-shaped casing 60 is inserted into the rack 1A so that the frame-shaped casing 60 is in contact with the lower end surface of the rack, the fixing member 69 is brought into contact with the front post of the rack 1A, and the frame-shaped casing 60 is fixed to the rack 1A using bolts. ing.

A front opening 62 is provided in the front frame member of the frame-shaped housing 60 so that the fan unit 55 can be inserted and removed. During operation of the electronic device, the front opening 62 is closed with a lid 63,
The blast of the fan 56 does not escape outside the rack.

Reference numeral 31 denotes a shaft (preferably a prismatic shape other than the bearing portion) rotatably mounted on the frame-shaped casing 60 so as to penetrate the central portion of the frame-shaped casing 60 in the front-rear direction. . Axis 31
The front end portion is pivotally supported by the front frame member portion and the rear end portion is directly connected to the rear frame member portion or the motor shaft of the motor 30 described later so as to travel in the front-rear direction above or below the case 51. It is supported.

Reference numeral 35 is a connecting fitting made of a thick square plate having a convex shape in front view, which has a hole (preferably a square hole) through which the shaft 31 passes, and which is fitted into the shaft 31 and fixed to the shaft 31. is there. The connecting fitting 35 is provided at a desired position of the shaft 31 (in the drawing, the front side and the rear side are separated from each other).
Fixed).

Then, the bottom portion of each connecting fitting 35 (referring to the lower portion in FIG. 1) is connected to the upper plate of the case 51 (the shaft 31 is the case).
When it is provided below 51, it is fixed to the bottom plate of the case 51) by screwing or the like.

Reference numeral 30 denotes a motor, such as a step motor, whose motor shaft can continuously perform a rotational movement within a predetermined angle range, and is attached to the rear frame member of the frame-shaped casing 60. .

The motor 30 has a motor shaft directly connected to the shaft 31.
31 is rotated, or the shaft 31 is rotated via a gear. Therefore, the rotation of the motor 30 follows the case.
51 swings. The angle at which the case 51 is swung is about ± 15 degrees, although it varies depending on the distance between the fan unit 25 and the bottom surface of the housing 11 of the printed board device 10.

As described above, the fan device 50 is mounted below the printed board device 10 mounted on the rack 1A, and the motor 30 is rotated during the operation of the electronic device. Therefore, as shown in FIG. 2, the case 51 accommodating the fan unit 55 performs a swinging motion in the left-right direction, and the blowing direction of each fan 56 swings within an angle about the vertical axis.

Therefore, since the printed board 15 housed directly above the fan 56 is also blown, all the printed boards 15 housed in the printed board device 10 are cooled substantially uniformly. It should be noted that, without providing the frame-shaped casing 60, all the printed boards are cooled substantially uniformly by making the case 51 swing in the rack, but the air blown by the fan unit 55 is the printed board device.
May run out of 10. Therefore, by providing the frame-shaped casing 60, the cooling efficiency of the printed board is increased.

In addition, a plurality of fan units 55 are attached to the case 51.
When the fan 56 of the fan unit 55 breaks down, there is an advantage that the broken fan 56 can be easily replaced while the case 51 remains fixed to the rack 1A.

Reference numeral 70 shown in FIG. 2 is a temperature sensor such as a bimetal with contacts. The temperature sensor 70 is attached to the upper part of the selected printed board 15 (the printed board on which the high heat-generating component is mounted or the printed board directly above the fan motor), and the printed board 15 has a predetermined temperature (the components mounted on the printed board are The contact of the temperature sensor 70 is set to be turned on when the temperature rises to 2 to 3 degrees lower than the temperature at which no malfunction or damage occurs.

On the other hand, a control unit (not shown) for controlling the rotation of the motor 30 based on the information of the temperature sensor 70 is attached to the fan device 50. This control unit stops the rotation of the motor 30 so that the case 51 maintains the state in which the case 51 is inclined in the direction of the printed board 15 until the printed board 15 to which the temperature sensor 70 is attached falls below a predetermined temperature, When the temperature falls below a predetermined temperature, the motor 30 is driven to cause the case 51 to perform a swinging motion.

By providing the temperature sensor 70 and the control unit in this manner, the cooling air is continuously blown to the printed board which needs to pay particular attention to the temperature rise. Therefore, there is no fear that the printed board will overheat.

[0051]

As described above, according to the present invention, the case in which the fan unit is accommodated is provided with a swinging motion, and all the printed boards accommodated in the printed board device are cooled substantially uniformly. Has the effect.

Also, the efficiency of cooling the printed board is increased by oscillating the case in which the fan unit is housed in the frame-shaped housing so that the case can be swung freely. Furthermore, by mounting the temperature sensor on the selected printed board, it is possible to prevent overheating of the printed board.

Since the fan unit is detachably housed in the case, the fan can be easily maintained and replaced.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is a perspective view of an electronic device.

FIG. 4 is a perspective view of a conventional fan device.

FIG. 5 is a cross-sectional view of a conventional example.

[Explanation of symbols]

1 Electronic equipment 1A rack 2,50 Fan device 10 Printed board device 11 Case 15 Printed board 21,51 Case 22,52 Ventilation window 25,55 Fan unit 26,56 Fan 27,57 Fan motor 30 Motor 31 Shaft 35 Connecting bracket 60 Frame type housing 61 Window 63 Lid 70 Temperature sensor

Claims (3)

[Claims] 1. A printed board device (10) comprising a printed board (15) housed in parallel in a box-shaped casing (11) is mounted on a rack, and a fan is installed below the printed board device (10). In a cooling structure of an electronic device that cools the printed board (15) by mounting the device, a case in which the fan device accommodates a plurality of fan units (55) in a removable manner.
(51) and the central part of the upper surface or the central part of the lower surface of the case (51) are held, the front end is pivotally supported by a member provided in the front part of the rack, and the rear end part is in the rear part of the rack. A shaft (31) pivotally supported by a member provided and a motor (30) for imparting a rotational movement to the shaft (31) are provided, and the case (51) rotates the motor (30). A cooling structure for electronic devices, which is characterized by swinging motion. 2. A printed board device (10) comprising a printed board (15) housed in parallel in a box-shaped casing (11) is mounted on a rack, and a fan is provided below the printed board device (10). In a cooling structure of an electronic device that cools the printed board (15) by mounting the device, a case in which the fan device accommodates a plurality of fan units (55) in a removable manner.
(51) and the central part of the upper surface or the central part of the lower surface of the case (51) are held, the front end is pivotally supported by a member provided in the front part of the rack, and the rear end part is in the rear part of the rack. A shaft (31) pivotally supported by a provided member, a motor (30) for imparting a rotational motion to the shaft (31), and a frame-shaped casing () for accommodating the case (51) in a swingable manner ( 60), the case (51) is oscillated by rotating the motor (30), and the frame-shaped casing (60) has a printed board device (10) with an upper end surface thereof. ) Is mounted on the rack so as to be in close contact with the lower end face of the electronic device. 3. A temperature sensor (70) mounted on a selected printed board (15), and a control unit for controlling rotation of a motor (30) based on information of the temperature sensor (70), The control unit controls the rotation of the motor (30) so that the case (51) maintains a state of being inclined in the direction of the printed board (15) until the selected printed board (15) becomes a predetermined temperature or lower. 3. The method according to claim 1, wherein the movement is stopped.
Electronic device cooling structure described.