JPH0739287Y2 - Electronic device cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a cooling device for an electronic device, and more specifically, a power supply unit is installed inside a device housing by driving a cooling fan. The present invention relates to a cooling device for an electronic device, which cools the electronic device provided.

(Prior Art) Recent electronic devices tend to be smaller and thinner, and it is necessary to improve the packing density of electronic components in a device housing. For example, electronic components are mounted on both sides of the wiring board to increase the mounting density of the electronic components on the wiring board, and of course, the wiring boards are arranged in multiple layers and accommodated inside the equipment housing. .

(Problems to be solved by the invention) By the way, in the electronic device as described above, the mounting density of the electronic components is improved, but the area occupied by the individual electronic components in the device housing is correspondingly reduced, so The heat generated by the heat generated by the components is likely to be trapped in the housing of the device, and this heat may cause error and damage to the electronic components.

Therefore, in this type of electronic device, there is also provided an electronic device in which a cooling fan is provided in the device housing to positively suppress the rise in the internal temperature of the device housing.

However, even in the electronic device as described above, when the cooling fan malfunctions or becomes inoperable, the internal temperature of the device housing rises, and it is difficult to prevent the heat influence.

In view of the above situation, an object of the present invention is to provide a cooling device for an electronic device, which can prevent adverse effects due to heat even when the cooling fan malfunctions or becomes inoperable.

[Constitution of device]

(Means for Solving the Problems) The present invention relates to a cooling device for an electronic device, wherein an electronic device having a power supply unit inside the device housing is cooled by driving a cooling fan. Based on the temperature rise, closing operation at different set temperatures,
And a plurality of thermostats arranged so that at least the one with the highest preset temperature is placed close to the power supply unit, and the cooling fan when the second thermostat is closed after the first thermostat is closed. While driving the driving fan, the fan driving means for stopping the cooling fan when the first thermostat is opened while the driving fan is being driven, and the third thermostat is closed after the third thermostat is closed. When the thermostat is closed, the power supply to the electronic circuit is stopped, and after that, even when the third thermostat is opened, the disconnection means for maintaining the power supply to the electronic circuit stopped and the external force And a push button switch which is activated when applied and which cancels the power supply stop state due to the operation of the cutoff means. There.

(Operation) According to the above configuration, when the internal temperature of the device housing exceeds the set temperature of the second thermostat, the internal temperature of the device housing is lower than the second thermostat. The cooling fan is driven until the temperature falls below the set temperature of the thermostat of
When the temperature exceeds the third set temperature which is higher than the set temperature of the thermostat, the power supply to the electronic components is stopped until the push button switch is operated.

(Embodiment) [Effect of the Invention] Hereinafter, a specific configuration of the present invention will be described in detail with reference to the drawings showing an embodiment.

FIG. 1 conceptually shows a cooling device for electronic equipment according to the present invention, and illustrates a cooling device applied to an electronic exchange 10 as shown in FIG.

As shown in the figure, the electronic exchange 10 is provided with a plurality of shelves 12 in a device housing 11, and houses a power supply unit 15 and a large number of printed wiring boards 13 between these shelves 12, respectively.
The power supply unit 15 and the printed wiring board 13 constitute an electronic circuit unit 14 in units of each shelf board 12. Although not shown in the figure, each of the shelf plates 12 has a ventilation hole, and these ventilation holes form a ventilation path extending in the up-down direction inside the device housing 11.

Further, the electronic exchange 10 includes four thermostats S1, S2, S3, S4 as shown in FIG. These thermostats S1, S2, S3, and S4 operate based on the internal temperature of the equipment casing 11, and are closed when the internal temperature of the equipment casing 11 exceeds the preset temperature below. It works.

S1… 40 ° C, S2… 55 ° C, S3… 70 ° C, S4… 85 ° C As is clear from FIG. 2, the above four thermostats S1, S2, S3, S4 are the top surface of the equipment casing 11. The thermostat S4, which has the highest preset temperature, is arranged in parallel with each other in the order of preset temperatures, and the power supply unit described above is used.
It is located at a position directly above 15.

Further, the electronic exchange 10 is equipped with a fan drive motor M as shown in FIG. Fan drive motor M
Is for driving the four cooling fans 20 of the fan unit 21 as shown in FIG. 3, and as shown in FIG. It is arranged in the upper part. The above fan unit 21
Is for circulating air from the lower side to the upper side inside the device housing 11 when each cooling fan 20 is driven, and is connected to the electronic exchange 10 through the connector connecting portion 20a formed at the rear end portion. It is electrically connected.

In the electronic exchange 10 configured as described above, in the normal state, all of the four thermostats S1, S2, S3, S4 described above are in the open state.

From this state, when the internal temperature of the device housing 11 rises above 40 ° C. due to heat generated from the electronic components mounted on the power supply unit 15 or the printed wiring board 13, first, only the thermostat S1 with the lowest set temperature is set. Will be closed. At this time, as shown in FIG. 1, the first relay (fan driving means) 30 has contact points 30 connected in series to the thermostat S1.
Since a is in the open state, it cannot be operated by the closing operation of the thermostat S1 alone.

When the internal temperature of the device housing 11 rises further and exceeds 55 ° C, the next thermostat in addition to the thermostat S1
S2 will also be closed, resulting in the first relay
30 is activated via the contacts of thermostat S2.

When the first relay 30 is energized, the respective contacts 30a, 30b
Is closed, the fan drive motor M is driven via the contact 30b, and the thermostat currently closed
The first relay 30 is self-held via S1 and the contact 30a. Therefore, when the internal temperature of the device housing 11 exceeds 55 ° C., the cooling fan 20 of the fan unit 21 is driven by the fan drive motor M to cool the device housing 11.

By driving the cooling fan 20, the internal temperature of the device housing 11 rises to 55
When the temperature becomes lower than ℃, the thermostat S2 is in the reset state, but the first relay 30 is still kept in the urging state by the self-holding operation described above, so that the fan drive motor M is continuously driven.

Further, when the internal temperature of the device housing 11 falls below 40 ° C., the thermostat S1 is reset and the first relay 30 is deenergized, and accordingly, the fan drive motor M is stopped.

After that, the above-described operation is repeatedly performed, whereby the internal temperature of the device housing 11 is maintained in the range of 40 to 55 ° C.

Here, for example, when the thermostat S2 or the fan drive motor M fails and the cooling fan 20 is not operated, that is, the internal temperature of the device housing 11 exceeds 55 ° C. due to heat generation from the power supply unit 15 and electronic components. The case of further increase will be described.

When the internal temperature of the device housing 11 exceeds 70 ° C., the thermostat S3 is first closed and the warning buzzer 40 sounds, and the warning lamp 50 is turned on. Therefore, an operator near the electronic exchange 10 can be made aware of the abnormal situation by the warning buzzer 40 and the warning lamp 50.

The operator does not notice the sound of the warning buzzer 40 or the lighting of the warning lamp 50, and the internal temperature of the device housing 11 rises to 85 ° C.
When the temperature exceeds, the thermostat S4 will be closed.
As a result, the second relay 60 (breaking means) is energized via the contact.

When the second relay 60 is energized, the contact 60a is closed, the second relay 60 is self-held via the contact 60a and the normally-closed push button switch 70a, and the contact 60b is closed. Then, the power supply to the electronic exchange 10 is stopped. As a result,
The heat generation from the power supply unit 15 and electronic parts is stopped,
An increase in the internal temperature of the device housing 11 is suppressed. At that time, according to the electronic exchange 10, since the thermostat S4 is arranged close to the power supply unit 15 having the highest temperature, the time until the thermostat S4 operates is shortened, and the electronic parts are in a high temperature state. The exposure time is also shorter.

Furthermore, the open state of the contact of the second relay 60 is set even when the internal temperature of the device housing 11 is lower than 85 ° C.
Since the push button switch 70a is continuously operated until the operator opens it, the above-mentioned abnormal situation, that is, the reason why the cooling fan 20 is not driven can be analyzed and dealt with without fail.

In addition, although the circuit for activating the warning buzzer and the warning lamp is provided in the above-described embodiment, this circuit is not necessarily provided. Further, although the action of stopping the power supply to the electronic circuit is performed by the relay, the action may be performed by the CPU.

[Effect of device]

As described above, according to the present invention, when the internal temperature of the device housing exceeds the installation temperature of the second thermostat, the internal temperature of the device housing is lower than the second thermostat. When the cooling fan is driven until the temperature falls below the set temperature of the first thermostat, and the internal temperature of the equipment case exceeds the third set temperature higher than the set temperature of the second thermostat, the push button switch Since the power supply to the electronic components is stopped until is operated, it is possible to always prevent the influence of heat of the electronic device.

Moreover, since the thermostat with the highest set temperature is placed close to the power supply unit with the highest temperature,
The time until the thermostat operates is shortened, and the time during which the electronic component is exposed to the high temperature state is shortened as much as possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a cooling device for an electronic device according to the present invention, and FIG. 2 is a perspective view conceptually showing an electronic device to which the cooling device shown in FIG. 1 is applied. Figure 3 shows the second
It is a perspective view which shows notionally the cooling fan applied to the electronic device shown in the figure. 10 ... Electronic exchange, 11 ... Equipment housing, 14 ... Electronic circuit unit, 15 ... Power supply unit, 20 ... Cooling fan, 30 ... First relay, 60 ... Second relay, 70a ... Push button switch, M ...
Fan drive motor, S1, S2, S3, S4 ... Thermostat.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // G05D 23/19 C 7740-3H

Claims (1)

[Scope of utility model registration request] 1. A cooling device for an electronic device, wherein an electronic device having a power supply unit inside the device housing is cooled by driving a cooling fan, and the cooling devices differ from each other based on an increase in internal temperature of the device housing. After the closing operation of the first thermostat and the plurality of thermostats arranged so as to close at the set temperature and at least the one having the highest set temperature close to the power supply unit, the second thermostat is closed again. The cooling fan is driven when the driving operation is performed, and the fan driving means that stops the cooling fan when the first thermostat is opened when the driving fan is driven; and the second thermostat is closed. When the third thermostat is closed, the power supply to the electronic circuit is stopped, and , A disconnecting means for maintaining a power supply stopped state to the electronic circuit even when the third thermostat is opened, and a power supply stopped state activated by an operation of the disconnecting means when an external force is applied. A cooling device for electronic equipment, comprising a push button switch.