JPH0513975A - Forced air cooling device - Google Patents

Abstract

PURPOSE:To enable an unattended forced air cooling device to operate continuously without losing a cooling function even if a filter is clogged or a cooling source is in failure. CONSTITUTION:In addition to primary fans 12a and 12b which feed cooling air to an equipment, outlet fans 15a and 15b are provided on an equipment outlet side, and hot air released from equipments 10a and 10b is forcibly discharged through the outlet fans 15a and 15b when a filter 13 is clogged, and enough cooling air is fed to the equipments 10a and 10b. Air cooled by a cooling source is fed to the equipments 10a and 10b passing through a circulation path to cool them in a circulation mode where they are protected against contamination. When a cooling source is in failure, a circulation mode is switched to an outside discharge mode, outside air is taken in and hot air is discharged outside to effectively prevent a temperature rise in the circulation path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced air type cooling device, and more particularly to an improved cooling device for performing desired air cooling by forcibly sending cooling air to a device having a heat source.

[0002]

2. Description of the Related Art Various types of stationary instruments used industrially usually have various heat sources inside, and it is necessary to cool them appropriately, and this cooling effect is not sufficient. If sufficient, there was a problem that an unexpected failure occurs due to heat generation of the device. Therefore, an appropriate cooling device must be installed for such a heat generating device.

There are various kinds of heat generating devices, but it is always desired to have an optimum and stable cooling action, especially for a device which is operated unattended for a relatively long period of time. Examples of such equipment include, for example, chemical treatment or chemical factories, where the treatment is continuously performed for a long time without requiring workers, or in isolated remote islands, mountains, etc. Examples include equipment that needs to be operated. Since it is difficult to make maintenance personnel permanently stationed at these devices, they are usually monitored and remotely operated by telemeter control. Since the telemeter control, which requires a large amount of investment even for the cooling device, cannot be performed, the cooling device used in such equipment is inevitably a high-quality and highly stable device that can withstand long-term use. Is required.

For example, a relay device for radio waves for television broadcasting is
Usually, it is often installed in a mountain far away from the town, and its operation itself requires almost no maintenance personnel, so it is usually operated unmanned. However, such a repeater or the like has a problem in that it has a relatively large amount of heat generation because it has a built-in high-power transmitter and must be cooled effectively. Therefore, in the related art, in most cases, this type of repeater is provided with a large-scale forced air cooling device, and this cooling device is also operated unattended.

[0005]

However, in such a conventional cooling device, the amount of cooling heat greatly fluctuates during the day and also includes seasonal fluctuations. Therefore, in order to perform a safe unmanned operation normally. However, there is a problem that the capacity of the cooling device must be set according to the peak time of the required cooling energy, which causes the cooling device itself to become significantly large, and this also affects the total cost of the equipment to be installed. There was a flaw that was reflected.

Further, in the forced air type cooling device,
Since air is blown to every corner of the device that is generating heat, the cooling air must be clean air, and in the past, such cooling air was guided to the device through a filter. When clogging occurs, there is a problem that a sufficient amount of cooling air cannot be obtained, and the standard blower does not sufficiently cool the air.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to effectively compensate for a decrease in cooling capacity that occurs when a filter is clogged even when outside air is taken in as cooling air. SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved forced draft cooling device capable of sufficiently reliable cooling even in unmanned operation.

Further, another object of the present invention is to use cooling air as circulating air in a normal state, thereby removing invasion of dust and dirt into the equipment from the outside, and by using dry circulating air. An object of the present invention is to provide an improved forced draft type cooling device in which unexpected dew condensation does not occur in the equipment.

Therefore, according to the present invention, by adopting the air circulation, it is possible to remove the filter which is apt to be clogged in a relatively short time, and the reliability of the cooling device is remarkably improved, and the device is not Since the hot air that comes out is not exhausted into the station building where the equipment is installed, there is an advantage that the contamination of the station itself can be prevented.

[0010]

In order to achieve the above object, the present invention is directed to a device including a heat source, in which a main blower sends cooling air under pressure, and hot air discharged from the device is directly exposed outdoors by a damper. It is either evacuated or selectively delivered to either the outlet blower for forced evacuation.

In the present invention, the cooling air pressure inside the equipment is constantly monitored by a pressure sensor. When the detected pressure is above a predetermined value, the warm air discharged from the equipment is placed outside the room, while when the detected pressure is below a predetermined value. Is driven by the outlet side blower and the controller controls the hot air to be sent out to the outlet side blower.

Further, according to the present invention, the cooling air from the cold air source is circulated to the equipment including the heat source, and the cooling air is always clean and has low humidity without the need for dirty air from the outside. Can act. Therefore, according to the present invention, a main blower is provided on the device inlet side and a return blower is provided on the device outlet side, and a circulating cooling action is performed between the cold air source and the device by the pair of blowers. .

The cooling action of the cold air source is constantly monitored by a cold air monitor. When the cold air source is normal, the circulation action described above is performed. The hot air that has come out is discharged to the outside through the damper without circulating. Therefore, it is understood that the controller switches from the normal circulation mode to the outdoor exhaust mode when an abnormality occurs in the cold air source.

Further, in the present invention, the cooling source comprises a one-way closed chamber having a cooling unit built therein, and when the cooling unit is normal, the return pressure is larger than the supply pressure to the device. Is kept closed, and when the cooling unit is abnormal on the other hand, the damper shuts off the circulation due to the cooling monitor output, so the inside of the one-way closed chamber is in a negative pressure state, and as a result, the closed chamber takes in outside air. To act.

[0015]

According to the present invention, therefore, in the normal case, the main blower can effectively spread the cooling air to every corner of the equipment. However, if, for example, a filter is clogged, the equipment is blown. Even if the cooling efficiency is low, a certain level or more of cooling action can be maintained until the outlet side fan is activated, the main blower is assisted, and the filter is replaced.

Further, according to the present invention, by repeatedly using the cooling air in the circulation mode, it is not necessary to introduce cooling air from the outside, and as a result, there is an advantage that dust, dirt and humidity are not given to the inside of the equipment. is there.

When a failure occurs in the cold air source while using such a circulation mode, there is an advantage that the mode is quickly switched to the outdoor exhaust mode and the cooling efficiency is not lowered.

Further, in the present invention, since the cooling source in the circulation mode is a one-way closed chamber having a cooling unit built therein, when the cooling unit is normal,
In order to keep the circulation mode, the one-way closed chamber can be kept in a closed state, and on the other hand, in the case of failure of the cooling unit, there is an advantage that it automatically switches to the external intake action. Therefore, according to such a cooling device of the present invention, there is an advantage that a highly reliable cooling action can be maintained even for a device in which telemeter control is performed without maintenance personnel.

[0019]

The preferred embodiments of the present invention will be described below.

FIG. 1 shows an embodiment in which the forced air blowing type cooling device according to the present invention is installed as cooling equipment for a television broadcast repeater.

In the figure, the television broadcast repeater is designated by reference numeral 1.
Two units are provided in parallel as indicated by 0a and 10b. In practice, these repeaters 10 are installed inside the station building and are normally unmanned. Each repeater 10
For supplying cooling air to the respective supply passages 11
a and 11b are provided, and a main blower 1 for sending cooling air to the device 10 under pressure is provided in each of these supply paths 11.
2a and 12b are provided. These main blowers 12
On the other hand, in the present embodiment, outside air is taken in as cooling air from the outside, and this cooling air is taken in in a state where dust is removed by the filter 13 and the roll filter 14.

A characteristic of the present invention is that each device 1
That is, on the outlet side of 0, outlet blowers 15a and 15b for forcibly exhausting the warm air discharged from the device are provided.

In the present invention, during normal cooling operation,
These outlet side blowers 15 are kept in a standby state, and the warm air discharged from each device 10 is directly exhausted to the outside from the dampers 16a and 16b. On the other hand, when the filter 13 or the roll filter 14 is clogged, it is not possible to introduce a sufficient amount of outdoor air even when the main blower 12 is operated at the maximum rating. In such a case, The cooling effect on the device 10 is significantly reduced. In such a case, in the present invention, the air blower 15 is driven and the damper 16 is closed at the same time to add the exhaust pressure of the air blower 15 to the air blow pressure of the main air blower 12 to obtain the air volume required for cooling. Secure.

In order to perform such control, in the present embodiment, the cooling air pressure inside the equipment is detected by the pressure sensors 17a and 17b, and the controller 18 is operated according to the detected pressure.
a and 18b perform the switching control. Actually, in the embodiment, not only the pressure sensor 17 but also the temperature inside the device is auxiliary detected in the environment inside the device 10 by the temperature sensors 19a and 19b. Therefore, the controller 18 normally controls the outlet fan 15 and the damper 16 while constantly monitoring the pressure inside the device 10, but controls the outlet fan 15 and the damper 16 depending on the temperature as necessary. You can also

According to an embodiment, the controller 1
8 also controls the exhaust blower 20 provided in the station where the equipment is installed, and when the temperature inside the station rises due to the heat generation of the equipment, inside the station separately from the outlet side blower 15. In order to adjust the temperature environment, the exhaust air blower 20 also controls the exhaust gas of the local building.

In the embodiment, the pressure sensor 17 comprises a Manostar gauge (vacuum gauge) switch, and the supply path 1
When the internal pressure 1 drops below a predetermined value, this manostar gauge switch contact is turned on, whereby the electric damper 16 is closed, and at the same time, the outlet blower 15 can be operated to forcibly perform indoor exhaust.

Further, in the embodiment, the temperature sensor 19
Has a set temperature of 29 ° C., respectively, and when the temperature inside the supply path 11 becomes higher than the standard set temperature, the electric damper 16 is closed and the outlet side blower 15 is operated separately from the pressure.

Therefore, in a normal state and in a state in which the filter 13 or the roll filter 14 is not clogged, external cooling air is sent to the equipment 10 only by the main blower 12 to obtain a sufficient air volume. The desired cooling effect is achieved. At this time, the outlet blower 15 is in a standby state, and the damper 16 is opened and the warm air discharged from the device 10 passes through the damper 16 and is discharged to the outside.

On the other hand, if the cooling device is used for a long period of time,
The filter 13 or the roll filter 14 is clogged, and as a result, the main blower 12 alone cannot supply sufficient cooling air to the device 10, which is detected by the pressure switch 17 as a pressure drop. In such a case, as described above, the controller 18 drives the outlet blower 15 and at the same time closes the damper 16 to apply negative pressure to the device 10 by the outlet blower 15 in addition to the main blower 12. As a result, it becomes possible to secure the minimum required cooling air volume for the device 10 even from the clogged filter 13 and roll filter 14.

Therefore, according to the present invention, it is possible to perform a highly reliable cooling action even for a device that is operated unattended for a long period of time, and even in a television broadcast repeater as in the embodiment. Therefore, it is possible to reliably prevent the situation where the broadcast output is lowered and the received video is deteriorated.

FIG. 2 shows a second embodiment of the forced air blowing type cooling device according to the present invention. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A characteristic of the second embodiment is that the cooling air supplied to the device 10 is normally circulated and used without being taken in from the outside, and as a result, the device 10 is cooled. Has the advantage that the cooling action does not adversely affect the operation of the device 10 without the entry of dust, dirt or humidity from the outside.

This circulation path includes the one-way closed chamber 23 in which the cooling units 21 and 22 connected in series inside are housed in a closed state, and the cold air cooled by the cooling units 21 and 22 is once closed in the one-way closed chamber. After being discharged into the inside 23, it is guided to the both main blowers 12 from the feed path 24. As in the first embodiment, the cool air blown into the device 10 from the main blower 12 through the supply path 11 cools down the details of the device 10,
From the return path 25 through the return blower 26, the closed chamber 23
It is connected to the inlet side of the first cooling unit 21 inside. The cooling units 21 and 22 are connected in series as described above, and after being cooled by the cooling heat exchange, the cool air is discharged into the sealed chamber 23 as described above. Therefore, since the cooling air is circulated to the device 10 by the above circulation path, there is an advantage that the device 10 is not contaminated as described above.

In order to supply the cooling medium to the cooling units 21 and 22, two chilling units 27 and 28 are provided in the embodiment, and cold water is produced by these chilling units 27 and 28. Cold water is accumulated in the cushion tank 29. Driving of cold water between the chilling units 27 and 28 and the cushion tank 29 is controlled by primary side pumps 30 and 31, respectively.

The cold water once accumulated in the cushion tank 29 is sent to each of the cooling units 21 and 22 by the secondary pump 32 as needed, and the heat of the circulating cold air is exchanged. These cooling units are controlled by the temperature control unit 33, the water temperature of the cushion tank 29 is detected by the sensor 34, and the temperature in the sealed chamber 23 is returned to the temperature control unit 33.
5. The water temperature of both chilling units 27, 28 is detected by the feed temperature sensor 36, and the water temperature sensors 37, 38
Have been detected by.

Therefore, the temperature control unit 33 performs a predetermined control calculation based on these detected temperatures and supplies a predetermined control signal to the chilling units 27 and 28 to bring the water temperature in the cushion tank 29 to a predetermined value. Control to keep.

Similar to the first embodiment described above, the cold air pressure and temperature inside the equipment 10 are detected by the pressure sensor 17 and the temperature sensor 19, respectively, and these detection signals are supplied to the controller 39. Controller 39
Further, control signals from the temperature control unit 33 are also supplied to the controller 39 based on these detection signals.
Controls the air volume of the return blower 26.

In the embodiment, the blowing pressures of the main blower 12 and the return blower 26 are set so that the latter is higher. In the normal case, it is preferable to set the return blow pressure to about 120% of the main blow pressure. As a result, since the return pressure is higher in the one-way closed chamber 23, the positive pressure is maintained. As shown in the figure, the closed chamber 23 has a flow damper 40.
The flow damper 40 is provided in the closed chamber 23.
It is closed when the inside pressure is positive, and as a result, when the above-mentioned normal cooling action is performed, the one-way closed chamber 2 is closed.
3 is kept sealed. As will be described later, the closed chamber 23
When the inside becomes negative pressure, this flow damper 40 is opened,
The outside air can be directly taken into the closed chamber 23.

As described above, in this embodiment,
Although the cold air passage forms a circulation passage, dampers 41a and 41b are provided on the output side of each device 10 in the present embodiment, and the temperature control unit 33 controls the opening and closing of these dampers 41. There is. During normal operation, these dampers 41 are in a closed state, but when a failure occurs in the cooling source, as will be described later, the temperature control unit 33 immediately opens the dampers 41, and the temperature is outside the normal circulation mode. Switch to exhaust mode.

Further, in the embodiment, similarly to the first embodiment, the outlet side blowers 42a and 42b are provided on the downstream side of the damper 41.
Is provided, the warm air can be forcibly discharged from the device 10 by opening the damper 41 and driving these outlet blowers 42 at the same time.

The second embodiment of the present invention has the above construction, and its operation will be described below.

In FIG. 2, the chilling units 27, 2
8 and the cushion tank 29 and other cooling sources are operating normally, cold air having a sufficiently low temperature is discharged from the cooling unit 22 to the outside of the sealed chamber 23. In this state, the temperature control unit 33 is operated by the damper. 41, and the controller 39 causes the return blower 26 to move to the main blower 12
It is operating with a sufficiently high blast pressure. Therefore, the cold air discharged into the closed chamber 23 cools the feed passage 24, the main blower 12, and the supply passage 11 to the details of each device 10,
From the return path 25 through the return blower 26 to the cooling unit 2
Set back to 1. Therefore, in such a state where the normal operation is performed, an extremely good cooling action is performed, and since it is the circulation mode as described above, there is a cooling action that does not cause pollution or the like to the device 10. To be achieved.

However, in the second embodiment, when some failure occurs in the cooling source, the temperature control unit 33 detects such failure by detecting the temperature of each part, and at this time, the damper 41 is immediately opened and the controller is simultaneously operated. The operation of the blower 26 is stopped via 39. At this time, it is also preferable that the temperature control unit 33 starts the operation of the outlet blower 42 as needed.

As a result, although the cold air is not supplied to the closed chamber 23 due to the failure of the cooling source, the cooling passage is switched from the circulation mode in the normal state to the outside air discharge mode, and the warm air discharged from the device 10 is dumped by the damper 41. Alternatively, if necessary, the air is discharged to the outside of the room through the outlet blower 42. Therefore, the temperature in the closed chamber 23 does not rise at all. Then, due to the above change of the cooling passage, the inside of the closed chamber 23 is brought into a negative pressure state by the suction of the main blower 12, and in this state, the flow damper 40 is opened and the outside air can be introduced into the blow passage very easily. Of course, the flow damper 40
It is appropriate to provide a filter on the outdoor side of the.

Therefore, even if some failure occurs in the cooling source, the device can continue the cooling action of the outside air introduction outside discharge type, and even in the equipment cooling device operated unattended, the minimum required cooling effect is obtained. Can be given.

Although the embodiments have been described with respect to the cooling of a television broadcast repeater, the present invention is not limited to such equipment, but can be applied to equipment for unmanned operation used in other manufacturing processes or chemical plants. Widely available.

[0047]

As described above, according to the present invention,
Even in an unmanned cooling device, even if the filter is clogged or the cooling source fails, the cooling function does not disappear. It can provide sufficient cooling action for a period of time, and is suitable for compensating continuous operation of the equipment.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a forced air cooling device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

10 equipment 11 supply path 12 Main blower 13 filters 13 roll filter 15 Outgoing blower 16 damper 17 Pressure sensor 18 Controller 19 Temperature sensor 21,22 Cooling unit 23 One-way closed chamber 26 Return blower 27,28 Chilling unit 29 Cushion tank 33 Temperature control unit 39 Controller 41 Damper 42 Outgoing blower

Claims (3)

[Claims] 1. A main blower for sending cooling air to equipment by force, an outlet fan for forcibly exhausting hot air coming out of equipment, a pressure sensor for detecting cooling air pressure inside equipment, and warm air coming out of equipment. A damper for selectively sending the air to the outlet-side blower or to the outside, and when the pressure detected by the pressure sensor is equal to or higher than a predetermined value, the warm air discharged from the device is directed to the outside, and when the detected pressure is equal to or lower than the predetermined value. Is a forced-air cooling device that includes a controller that drives the outlet fan and sends hot air to the outlet fan. 2. A main blower provided on the equipment inlet side for sending cooling air from the cold air source to the equipment, and a equipment blower on the equipment outlet side for returning warm air discharged from the equipment to the cold air source. A return blower provided, a damper provided in a return path on the equipment outlet side, which selectively sends hot air to either the return blower or outdoors, a cold air monitor for monitoring the cooling action of the cold air source, and A forced air blowing type cooling device including a controller that switches the damper from a circulation mode to an outdoor exhaust mode when an abnormality occurs in the cold air source by a cold air monitor output. 3. The apparatus according to claim 2, wherein the cold air source includes a one-way closed chamber having a cooling unit incorporated therein, and the one-way closed chamber returns from a supply pressure when the cooling unit is normal. A forced air type cooling device characterized in that it keeps a sealed state due to a large pressure, and on the other hand, when the cooling unit is abnormal, the return air is cut off to take in outside air.