JP2002277002A - Housing cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing cooling system capable of being space-saved, reducing the number of units to be installed and decreasing a time required for discussing a unit installing position. SOLUTION: The housing cooling system 1 cools in a housing 3 by a main cooler 10 having a forcibly circulating refrigerant circuit 16 and an auxiliary cooler 9 having a natural circulation refrigerant circuit 15. In this system 1, the auxiliary cooler 9 executes a ventilating operation for sucking atmosphere into the housing 3 by an indoor side fan 25, and exhausting the indoor atmosphere out of the housing 3 by an outdoor side fan 26 in addition to an ordinary cooling operation using the refrigerant circuit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case cooling system for cooling the inside of a case containing heat-generating components, for example, in a communication base station having a built-in communication device.

[0002]

2. Description of the Related Art For example, a relay base station for a portable telephone is
Many are installed in various places with different conditions, such as the rooftops of condominiums and office buildings, as well as the summits and wilderness of suburbs in urban areas. This type of communication base station
Generally, a communication device is accommodated in a sealed housing. However, there is a case in which the space is too small for a person to enter, and since the communication device has a heat-generating component, it is necessary to appropriately cool the inside of the case. As a case cooling system for cooling the inside of the case, there is a system proposed in Japanese Patent Application No. 11-219661 filed by the present applicant. FIG. 7 shows a conventional case cooling system of this kind. In the figure, a communication device 54 including a heat-generating component 55 is accommodated in a housing 53 of the communication base station 52. Usually, in the communication device 54, a casing 56 containing a heat-generating component 55 is provided, and a fan (not shown) is provided in the casing 56, and is formed on a side surface or a bottom surface of the casing 56. While air is taken into the casing 56 from the air intake 57, hot air that has been heated by contacting the heat-generating component 55 in the casing 56 is blown to the outside through an exhaust port 58 formed in the upper portion of the casing 56. .

[0003] The casing cooling system 51 of the communication base station 52 as described above includes a main cooling device 75 having a forced circulation refrigerant circuit 66 for forcibly circulating a refrigerant by a compressor 74 and a density difference between a liquid refrigerant and a gas refrigerant. The inside of the housing 53 is cooled by an auxiliary cooling device 76 having a natural circulation refrigerant circuit 65 for naturally circulating the refrigerant. Reference numeral 61 denotes an indoor unit of the main cooling device 75, and 62 denotes a main cooling device 7.
Reference numeral 5 denotes an outdoor unit, and reference numeral 60 denotes an outdoor unit of the auxiliary cooling device 76. Further, the housing 53 includes a ventilation fan 63 for sucking outside air and an exhaust damper for opening and closing an exhaust port in order to prevent the temperature inside the housing 53 from rising to a certain temperature or more when the housing cooling system 51 is abnormal. 64 are provided. In the case cooling system 51 of the related art, the cooling capacity is determined according to the amount of heat generated by the heat-generating component 55 at the time of maximum load. Also, a housing 53 forming a closed space
Is generally of a structure with very little heat flow, so that there is almost no change in the cooling load inside the housing 53 due to a change in the outside air temperature.

Next, the operation of the conventional case cooling system 51 will be described. During normal operation, the rotation of a fan (not shown) in the casing 56 of the communication device 54 causes cool air at a position indicated by reference numeral a in the drawing to be taken into the casing 56 from the air inlet 57 by the side of the casing 56. It is. The taken-in cool air cools the heat-generating component 55 and becomes hot air.
Is blown out to the position indicated by the symbol c in the above. The hot air blown out in this way is sucked into the evaporator 59a of the auxiliary cooling device 76 from the position indicated by the reference character D through the hot air suction port 70 by the blowing of the indoor unit fan 67 of the main cooling device 75, and the natural circulation refrigerant. Primary cooling is performed by heat exchange with the refrigerant in the circuit 65. The refrigerant that exchanges heat with hot air and evaporates in the evaporator 59a rises to the condenser 59a of the auxiliary cooling device 76,
The heat is exchanged with the outside air blown by the outdoor unit fan 69 to condense in the condenser 59a.

On the other hand, the air after the primary cooling at the position indicated by the symbol オ is sucked by the indoor unit fan 67, and the whole amount passes through the evaporator 72 a of the main cooling device 75 in the indoor unit 61 and is forcibly forced. Secondary cooling is performed by heat exchange with the refrigerant in the circulating refrigerant circuit 66. The air thus secondary-cooled is blown out as cold air from the cold air outlet 71 to a position indicated by a symbol a in the housing 53. That is, the air circulates in the order of A → A → U → D → E to cool the inside of the housing 53. Further, the refrigerant evaporated and vaporized in the evaporator 72a is compressed by the compressor 74 in the outdoor unit 62 of the main cooling device 75, and then heat exchanges with the external air blown by the outdoor unit fan 68 in the condenser 72b. And condense.

The indoor unit fan 67 of the main cooling device 75
If the communication device 54 does not operate due to a failure or power is not supplied due to a power failure, the communication device 54 always operates with the backup power supply (not shown). However, since the cooling device does not operate, the inside air temperature in the housing 53 decreases. To rise. In the housing 53, a temperature detecting means 73 for detecting an abnormality is provided. When the detected temperature of the temperature detecting means 73 exceeds a predetermined temperature (for example, 40 ° C.), the ventilation fan 63 and the exhaust damper 64 are activated. It operates to suck outside air and exhaust air inside the housing 53 at the same time. Nevertheless, when the temperature of the temperature detecting means 73 continues to rise and reaches a predetermined temperature (for example, 45 ° C.),
Issue an error notification to the management center. This is a two-stage operation.

[0007]

The conventional case cooling system 51 is composed of a main cooling device 75, an auxiliary cooling device 76, a ventilation fan 63, and an exhaust damper 64. Therefore, while the number of devices to be installed is large, the dimensions of the housing 53 are determined, and therefore, a detailed study is required on where to install each device. Especially the auxiliary cooling device 7
Numeral 6 designates equipment for improving the energy saving of the entire system. The evaporator 59a is connected to the exhaust port 5 of the casing 56.
8, the energy saving effect increases as the distance increases. In addition, when the cooling device is abnormal, the ventilation fan 63
Therefore, it is desirable to install it near the casing 56 similarly to the evaporator 59a. As described above, since there are multiple devices that are desired to be installed in the same position, it is necessary to spend time in determining the installation positions when examining what and how to obtain the best effect as a system. Problem. In addition, since a large number of devices are installed outside the housing 53, there is a problem that unevenness is generated and appearance (appearance) is deteriorated.

The present invention has been made in view of the above-mentioned problems of the prior art, and can save space, reduce the number of devices to be installed, and reduce the time required for studying the installation positions of the devices. It is an object of the present invention to provide a casing cooling system capable of reducing the number of cases.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a main cooling device having a forced circulation refrigerant circuit and an auxiliary cooling device having a natural circulation refrigerant circuit. A case cooling system for cooling by a device, wherein an auxiliary cooling device is configured such that an inside air side fan that allows inside air inside the case to flow through an evaporator of the natural circulation refrigerant circuit, and an outside air outside the case to a condenser of the natural circulation refrigerant circuit. And an outside-air-side fan for ventilating, wherein the auxiliary cooling device is
In addition to a normal cooling operation using a natural circulation refrigerant circuit, a ventilation operation is performed in which outside air is sucked into a housing by an inside air fan and inside air is discharged outside the housing by an outside air fan.

[0010] In addition to the above configuration, the outside air temperature detecting means for detecting the outside air temperature outside the housing, and when the auxiliary cooling device is performing a cooling operation, at least the inside air side based on the detected temperature of the outside air temperature detecting means. Fan control means for stopping the operation of the fan and the outside air fan.

Further, in addition to the above configuration, an inside air temperature detecting means for detecting the inside air temperature in the housing, and the operation state of the auxiliary cooling device is switched from the cooling operation to the ventilation operation based on the detected temperature of the inside air temperature detecting means. Operation switching control means.

Further, in addition to the above configuration, the inside air temperature abnormality detecting means for detecting an abnormal rise in the inside air temperature in the housing, and the inside air temperature abnormality detecting means for detecting the inside air temperature when the auxiliary cooling device is performing the ventilation operation. When an abnormal rise is detected, a fire prevention damper for shutting off an air intake path for the outside air into the housing and a discharge air path for the inside air to the outside of the housing is provided.

Further, in the above configuration, the natural circulation refrigerant circuit of the auxiliary cooling device is constituted by a heat pipe.

Further, in addition to the above configuration, a battery power supply for supplying power to the inside air fan and the outside air fan at the time of a power failure is provided.

Further, in the above structure, the auxiliary cooling device is provided so as to protrude outward from the side surface of the housing, and an external air suction port for sucking outside air during ventilation operation is formed on a bottom surface of the protruding portion of the auxiliary cooling device. Is what it is.

Further, in addition to the above configuration, hoods that open downward are respectively attached to the air inlet and outlet of the outside air side fan during the cooling operation of the auxiliary cooling device.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic configuration diagrams of a casing cooling system showing a device configuration common to Embodiments 1 to 8 of the present invention. FIG. FIG. 2 shows a state in which ventilation operation is being performed at the time of abnormality. 3 and 4 are schematic diagrams of an auxiliary cooling device that constitutes a part of the casing cooling system. FIG. 3 shows a state in which a cooling operation is performed at a normal time, and FIG. Are shown, respectively. Since the schematic configuration of the auxiliary cooling device is common to Embodiments 1 to 7 of the present invention, for convenience, FIGS.
The components according to each of the above embodiments are also shown.

Embodiment 1 of the Invention In FIGS. 1 and 2, reference numeral 3 denotes a housing housing the communication device 4 of the communication base station 2 as an example of the housing according to the present invention. Under normal conditions, the space inside the housing 3 is configured as a closed space. The heat-generating component 5 is included in the communication device 4, the heat-generating component 5 is incorporated in the casing 6, and the casing 6 has an air inlet 7 and an exhaust port 8 formed therein. The fact that a fan (not shown) is provided is the same as that of the communication base station shown in the conventional technique. The casing cooling system 1 includes a main cooling device 10 having a forced circulation refrigerant circuit 16 for forcibly circulating a refrigerant by a compressor 24, and a natural circulation refrigerant circuit for naturally circulating the refrigerant by a density difference between a liquid refrigerant and a gas refrigerant. The auxiliary cooling device 9 having the configuration 15 cools the inside of the housing 3 of the communication base station 2. Reference numeral 11 denotes an indoor unit of the main cooling device 10 provided inside the housing 3, and reference numeral 12 denotes an outdoor unit of the main cooling device 10 provided outside the housing 3.

Hereinafter, the specific configuration of the casing cooling system 1 will be described while describing the operation of the casing cooling system 1. First, an operation during a normal cooling operation will be described with reference to FIGS. By the rotation of a fan (not shown) in the casing 6 of the communication device 4, cool air at a position indicated by reference numeral a on the side of the casing 6 is taken into the casing 6 from the air inlet 7.
The cold air taken in cools the heat-generating component 5 and becomes hot air,
The air is blown out from the exhaust port 8 in the upper part of the casing 6 to a position indicated by reference numeral c in the housing 3.

A part of the hot air (inside air in the housing 3) thus blown out is moved from a position indicated by reference character D to a hot air suction port by an indoor unit fan 17 provided in the indoor unit 11 of the main cooling device 10. Air that has been sucked into the indoor unit 11 through the evaporator 20 and cooled by heat exchange with the refrigerant in the forced circulation refrigerant circuit 16 when passing through the evaporator 13 (indoor heat exchanger) of the main cooling device 10 is cooled. Is blown out as cool air from the cool air outlet 21 to a position indicated by a symbol a in the housing 3. Also,
The other part of the hot air (inside air in the case 3) blown out from the exhaust port 8 in the upper part of the casing 6 to the position of c in the case 3 is indicated by a symbol “o” by the inside air side fan 25 of the auxiliary cooling device 9. Through the suction port 44 and the casing 4 of the auxiliary cooling device 9
The natural circulation refrigerant circuit 15 that is drawn into the auxiliary cooling device 9 is passed through the evaporator 27 of the natural circulation refrigerant circuit 15, where it is cooled by heat exchange with the refrigerant in the natural circulation refrigerant circuit 15 (see FIG. 3). Then, the cooled air is blown out as cold air from the outlet 45 to a position indicated by reference numeral f in the housing 3. That is, the air (inside air in the housing 3) has a flow path that sequentially circulates through the positions a → a → u → d in FIG.
There are two flow paths, a flow path that sequentially circulates from position c to a position e, and the inside of the housing 3 is cooled by the circulation of air along these flow paths. Reference numeral 46a in the figure denotes a partition that partitions the space in the casing 46 of the auxiliary cooling device 9 into a space on the evaporator 27 side of the natural circulation refrigerant circuit 15 and a space on the condenser 28 side of the natural circulation refrigerant circuit 15. Is shown.

Further, in the refrigerant system of the natural circulation refrigerant circuit 15, the refrigerant which has been evaporated in the evaporator 27 by heat exchange with the hot air to become a gas refrigerant changes due to the density difference with the liquid refrigerant. To the condenser 28. In the condenser 28, the gas refrigerant is condensed by heat exchange with the outside air which is sucked into the casing 46 from the suction port 40 by the outside air fan 26 of the auxiliary cooling device 9 and is passed through the condenser 28, thereby forming a liquid refrigerant. Becomes This liquid refrigerant flows into the evaporator 2 by natural flow due to the density difference from the gas refrigerant.
Reaches 7. The outside air heated by the heat exchange with the gas refrigerant in the condenser 28 is blown out of the casing 46 from the outlet 41.

On the other hand, in the refrigerant system of the forced circulation refrigerant circuit 16, the high-temperature and high-pressure gas refrigerant forcedly discharged from the compressor 24 is supplied to the condenser 14 (in the outdoor unit 12 of the main cooling device 10). The refrigerant flows into the outdoor heat exchanger, and is cooled by heat exchange with the outside air flowing into the outdoor unit 12 by the outdoor unit fan 18 to become a liquid refrigerant. The liquid refrigerant is decompressed by a refrigerant throttle valve (not shown) to be in a gas-liquid two-phase state, and is sent to the evaporator 13 in the indoor unit 11 through a refrigerant pipe (not shown). This refrigerant exchanges heat with the hot air sucked from the hot air suction port 20 in the evaporator 13 to become a low-pressure gas refrigerant, and returns to a suction side of the compressor 24 via a refrigerant pipe (not shown). The operating capacity of the compressor 24 is determined by the air temperature at the position a near the air inlet 7 of the casing 6 of the communication device 4 or the air temperature at the position d near the hot air inlet 20 of the indoor unit 11 (the inside air temperature detecting means 23). And so on).

Next, with reference to FIGS. 2 and 4, the ventilation operation of the auxiliary cooling device 9 when the main cooling device 10 breaks down or when the main cooling device 10 does not operate due to no power supply due to a power failure will be described. I will explain it. Even in the event of a power outage,
The communication device 4 continues to operate with a backup power supply (not shown). For this reason, by the rotation of the fan (not shown) in the casing 6, the air located at the position a on the side of the casing 6 is taken into the casing 6 from the air inlet 7. The taken-in air cools the heat-generating component 5 to become hot air, and is blown out from the exhaust port 8 on the upper part of the casing 6 to the position of c in the housing 3. The hot air thus blown out does not flow to the indoor unit 11 because the indoor unit fan 17 of the main cooling device 10 is stopped, and is turned off by the inside air side fan 25 of the auxiliary cooling device 9 as shown in FIG. From the position, it is sucked into the casing 46, passes through the evaporator 27, is cooled by heat exchange with the refrigerant in the natural circulation refrigerant circuit 15, and the cooled air is cooled as air from the outlet 45 to the position of the power inside the housing 3. To be blown out. That is, the air is the same as that shown in FIG.
The inside of the housing 3 is cooled by sequentially circulating through the positions of c → e.

However, since the cooling capacity of the auxiliary cooling device 9 is smaller than that of the main cooling device 10, even if the auxiliary cooling device 9 is continuously operated, the cooling capacity is insufficient and the temperature in the housing 3 rises. Then, for example, when the inside air temperature in the housing 3 detected by the inside air temperature detecting means 23 exceeds a predetermined temperature (for example, 40 ° C.), it is determined to be abnormal and shown in FIGS. Dampers 29, 3 of auxiliary cooling device 9
By opening and closing 0, the auxiliary cooling device 9 switches from the cooling operation to the ventilation operation. That is, by moving the damper 29 from the position shown in FIG. 3 to the position shown in FIG. 4, the outside air suction air passage 48 communicating the outside air suction port 31 opened outside the casing 46 and the air outlet 45 is formed. It is formed. Further, by moving the damper 30 from the position shown in FIG. 3 (the position where the inside air discharge port 32 is closed) to the position shown in FIG. 4, the inside air discharge port 32 opened in the housing 3 and the air outlet 41 are formed. Is formed, and an inside air discharge passage 49 is formed. Further, the suction port 4 opened in the state of FIG.
4 is closed by a damper 47 (see FIG. 4). Thereby, the outside air outside the housing 3 is sucked into the housing 3 from the outside air suction port 31 through the suction air passage 48 and the air outlet 45 by the inside air side fan 25 of the auxiliary cooling device 9 as shown in FIG. . Then, the sucked air diffuses into the housing 3 to lower the inside air temperature, and at the same time, the high-temperature inside air in the housing 3 is discharged by the outside air fan 26 of the auxiliary cooling device 9 as shown in FIG. The air is discharged from the inside air outlet 32 to the outside of the housing 3 through the discharge air passage 49 and the air outlet 41. By performing such a ventilation operation, the temperature in the housing 3 is in a steady state at a temperature at which the amount of heat generated by the heat generating component 5 included in the communication device 4 and the amount of ventilation air by the auxiliary cooling device 9 are balanced.

As described above, according to the case cooling system 1 according to the first embodiment, the auxiliary cooling device 9
In addition to the cooling operation that exhibits energy-saving effects, the main cooling device 1
Since the ventilation (exhaust) operation at the time of failure of 0 or abnormalities such as a power failure can be executed by a common fan,
This eliminates the need for a ventilation fan and an exhaust damper that were required in the conventional case cooling system. For this reason, the installation space is smaller than in the conventional case, and the appearance of the housing 3 is also less uneven, and the appearance is good.

By the way, during the cooling operation, the auxiliary cooling device 9
The greater the temperature difference between the inside air sucked in by the inside air fan 25 and the outside air sucked in by the outside air fan 26, the higher the cooling capacity is exhibited. Therefore, it is efficient to exchange heat with the hot air near the heat-generating component 5 as much as possible. It is. Therefore, the guide plate 33 is provided near the inside air side fan 25 (see FIG. 1).
It is desirable to install hot water to attract hot air. Thus, the hot air temperature at the position C immediately after the air is blown out from the exhaust port 8 of the casing 6 can be moved to the position O while the hot air temperature is almost maintained, and the air can be sucked into the inside air side fan 25.

Embodiment 2 of the Invention In the case cooling system according to the second embodiment, as shown in FIGS. 3 and 4, a control device 34 including, for example, a microcomputer is provided in the auxiliary cooling device 9. And
The control device 34 includes an outside air temperature detecting means 36 (see FIG. 3) for detecting the outside air temperature outside the housing 3 and the inside air temperature inside the housing 3 (preferably, the temperature near the evaporator 27 of the auxiliary cooling device 9).
And a fan control means 35 for operating / stopping the inside air side fan 25 and the outside air side fan 26 of the auxiliary cooling device 9 based on the respective detected temperatures with the inside air temperature detecting means 37 (see FIG. 3) for detecting the temperature. I have.

Next, the operation will be described. When the outside air temperature detecting means 36 detects the outside air temperature and the inside air temperature detecting means 37 detects the inside air temperature, the fan control means 35 calculates the temperature difference between the detected temperatures (the inside air temperature and the outside air temperature). Then, the operation of the inside air side fan 25 and the outside air side fan 26 is stopped based on the calculated temperature difference. Specifically, a memory (not shown) in the control device 34 stores, in a memory (not shown), a predetermined temperature difference as a reference for the fan operation / stop control. Is determined and stored in advance, and when the auxiliary cooling device 9 is performing the cooling operation, the temperature difference between the actually detected inside air temperature and the outside air temperature falls below the predetermined temperature difference. At the time, the inside air side fan 25 and the outside air side fan 26
Is stopped.

Therefore, in the third embodiment, if the difference between the inside air temperature and the outside air temperature is small and the cooling capacity of the auxiliary cooling device 9 cannot be exhibited, the inside air fan 2
5 and the outside air side fan 26 can be stopped to avoid unnecessary expenditure of operating cost (electricity cost) and extend the life of the fan. Incidentally, the larger the temperature difference between the outside air temperature and the inside air temperature is, the larger the cooling capacity of the natural circulation refrigerant circuit 15 is.
6 can reduce the operation load.

In the above description, the control is performed based on the detected temperatures of the outside air temperature detecting means 36 and the inside air temperature detecting means 37. However, if the heat generation load in the housing 3 hardly changes throughout the year, for example, The operation / stop control of the inside air side fan 25 and the outside air side fan 26 can also be performed based only on the outside air temperature detected by the means 36. In this case, the inside air temperature detection means 37 can be omitted, so that the control configuration is simplified. , And the same control as described above can be realized at lower cost.

If there is a condition that the inside air temperature in the housing 3 must not be higher than a certain temperature, the inside air side fan 25 and the outside air fan 25 based on only the inside air temperature detected by the inside air temperature detecting means 37. It is also conceivable to perform the operation / stop control of the side fan 26, in which case the outside air temperature detecting means 36 can be omitted, so that the control configuration can be simplified and the cost can be reduced.

Embodiment 3 of the Invention In the case cooling system according to the third embodiment, as shown in FIGS. 3 and 4, a control device 34 including, for example, a microcomputer is provided in the auxiliary cooling device 9. And
The control device 34 includes an operation switching control unit 38 that switches the operation state of the auxiliary cooling device 9 from the cooling operation to the ventilation operation based on the temperature detected by the inside air temperature detection unit 23 illustrated in FIGS. 1 and 2.

That is, the inside air temperature detecting means 23 is
When the inside air temperature in the inside is detected, the operation switching control means 38
Switching between the cooling operation and the ventilation operation of the auxiliary cooling device 9 is performed based on the detected inside air temperature. More specifically, the auxiliary cooling device 9 is stored in a memory (not shown) in the control device 34.
A predetermined temperature (a value for determining the ventilation temperature if the inside air temperature is equal to or higher than C) is set and stored as a reference of the operation state switching control of the above. When the temperature exceeds a predetermined temperature, control is performed to switch the operation state of the auxiliary cooling device 9 from the cooling operation to the ventilation operation.

In the third embodiment, when the inside air temperature in the housing 3 is high and there is a possibility that the communication device 4 will break down, it is determined that an abnormality has occurred in the cooling system, and ventilation for taking in outside air is performed. Switch to operation. Therefore, case 3
The temperature rise in the inside can be suppressed, and the failure of the communication device 4 (the heat-generating component 5) can be prevented.

Incidentally, in order to suppress noise, the inside air side fan 25 and the outside air side fan 26 during a normal cooling operation.
On the other hand, in the ventilation operation, the effect of suppressing the temperature rise in the housing 3 as the ventilation air volume by the inside air side fan 25 and the outside air side fan 26 increases is large. Is improved. Therefore, in addition to the above-described operation state switching control, in the ventilation operation in which an abnormality occurs in the cooling system, control for switching to a large air volume by increasing the rotation speed of the inside air side fan 25 and the outside air side fan 26 is performed. Is also conceivable. In addition, even if the ventilation operation is performed, if the detected temperature of the inside air temperature detecting means 23 continues to increase, control for automatically notifying the management center based on the condition preset in the operation switching control means 38 is performed. It is more preferable to do so from the viewpoint of safety.

Embodiment 4 of the Invention In the case cooling system according to the fourth embodiment, as shown in FIGS. 3 and 4, the auxiliary cooling device 9 detects an abnormal rise in the inside air temperature in the housing 3. An abnormality detecting means 39 is provided. In the event that a fire occurs in the housing 3, the temperature near the condenser 28 of the auxiliary cooling device 9 is detected by the inside air temperature abnormality detecting means 39, and the fire prevention damper is detected based on the detected temperature. Is opened and closed. Specifically, while the auxiliary cooling device 9 is performing the ventilation operation, the inside air temperature abnormality detecting means 39 detects an abnormal temperature rise, and the detection information is transmitted to the control means (not shown). The control means moves the damper 29 and the damper 30 from the position shown in FIG. 4 to the position shown in FIG.
Further, control is performed to shut off the exhaust air passage 49 of the inside air to the outside of the housing 3 by the dampers 29 and 30, respectively. As described above, in the fourth embodiment, even if a fire should occur in the housing 3, the air passage communicating between the inside and the outside of the housing 3 is blocked by the fire prevention damper. It does not spread to the outside.

Embodiment 5 of the Invention In the case cooling system according to the fifth embodiment, as shown in FIGS.
A heat pipe of the auxiliary cooling device 9 in which the natural circulation refrigerant circuit 15 including the evaporator 27 and the condenser 28 is integrated is used. A heat pipe is a heat transfer tube with extremely high thermal conductivity. When one end of the heat pipe is heated in a high-temperature environment, the working fluid (refrigerant) in the tube is heated and evaporates to become steam and the other end. Move to. The steam cooled at the other end of the heat pipe condenses into a liquid, and returns to one end (evaporator) due to a height difference. If such a heat pipe is used, it is possible to reduce the thickness while securing the same heat exchange performance as compared with the case of using a cross-flow type heat exchanger, so that the auxiliary cooling device 9 is formed thin. can do. That is, in this embodiment, one end of the heat pipe is connected to the casing 46.
The lower end of the heat pipe is disposed in a space above the partition 46a in the casing 46, while the other end of the heat pipe is disposed in the space below the partition 46a. The other end is a condenser 28. Therefore, the entire natural circulation refrigerant circuit 15 is constituted by a heat pipe, and the auxiliary cooling device 9 can be manufactured thin. Therefore, even when the auxiliary cooling device 9 is installed on the side of the housing 3, The unevenness outside the side surface of the body 3 can be reduced, and the appearance can be improved.

Embodiment 6 of the Invention In the case cooling system according to the sixth embodiment, the inside air side fan 25 and the outside air side fan 26 of the auxiliary cooling device 9 are configured to be rotatable with a DC power supply (battery power supply) so as to operate even during a power failure. . That is, when a power failure occurs, the indoor unit 11 and the outdoor unit 12 of the main cooling device 10 are not supplied with power, and thus stop operating. However, the power supply of the communication device 4 is changed from the power supply supplied by the power company to the battery installed in the housing 3. Power supply (not shown)
Automatically switches to and continues operation. However,
As described above, in a situation where the main cooling device 10 is stopped and only the auxiliary cooling device 9 is operated, the inside air temperature in the housing 3 increases due to insufficient cooling capacity. In such a state, the auxiliary cooling device 9 performs the ventilation operation of taking in the outside air into the housing 3 by using the power from the battery power supply, so that the inside air temperature can be maintained at a certain temperature or less. That is, in the sixth embodiment, the inside air side fan 25 and the outside air side fan 26 of the auxiliary cooling device 9 are also operated by the electric power from the battery power supply. The cooling operation is continued, and when the inside air temperature rises, the auxiliary cooling device 9 is switched to the ventilation operation by the battery power, so that the communication device 4 can be reliably protected.

Embodiment 7 of the Invention In the case cooling system according to the seventh embodiment, as shown in FIGS.
The auxiliary cooling device 9 is configured such that a part of its casing 46 is
It is installed so that it protrudes outward from the side of the
An outside air inlet 31 for sucking outside air during the ventilation operation is formed on the bottom surface of the casing 46 at a portion protruding outward from the side surface of the housing 3. Generally, the communication base station 2 is often installed outdoors, and is expected to be exposed to wind and rain such as a typhoon. When the inside air temperature in the housing 3 exceeds a certain temperature, the auxiliary cooling device 9 is switched to the ventilation operation for protection of the communication device 4. 3 and cause a failure of the communication device 4. Therefore, the outside air inlet 31
Is formed on the bottom surface of the casing 46 which is hardly affected by wind and rain, thereby preventing rain from entering the housing 3. That is, in the seventh embodiment, even when the auxiliary cooling device 9 performs the ventilation operation on a day with strong wind and rain, it is possible to prevent the communication device 4 from being adversely affected.

Embodiment 8 of the Invention In the case cooling system according to the eighth embodiment, as shown in FIGS.
In the vicinity of the inlet 40 and the outlet 41 of the outside air side fan 26 of the auxiliary cooling device 9, an inlet hood 42 and an outlet hood 4
3 are provided respectively. The inlet hood 42 and the outlet hood 43 are configured to cover the front, upper, and left and right sides of the inlet 40 and the outlet 41, respectively, and to be open only below. When the auxiliary cooling device 9 performs the ventilation operation, the damper (outside air side) 30 opens and closes,
The hot air in the housing 3 is sucked from the inside air outlet 32 and blown out from the air outlet 41, but in the event of a storm such as a typhoon, rain may enter the housing 3 from the air outlet 41 due to the wind. In the normal cooling operation, the outside air is sucked in from the suction port 40 and blown out from the air outlet 41. However, if only the air outlet hood 43 is attached in order to prevent the invasion of rain due to the ventilation operation in bad weather, the air outlet Hot air blown downward from 41 is sucked into the suction port 40 as it is, which causes a so-called “short cycle”.
Therefore, by installing a suction port hood 42 also at the suction port 41, a short cycle is prevented. Therefore, in the eighth embodiment, even when the auxiliary cooling device 9 performs the ventilation operation on a day when the weather is strong, it is possible to prevent the intrusion of rain from the air outlet 41 and to operate without affecting the communication device 4. In addition, when the auxiliary cooling device 9 performs a normal cooling operation, a short cycle can be prevented, and highly efficient heat exchange can be performed. 5 and 6 show an example in which the inlet hood 42 and the outlet hood 43 are formed separately, but the inlet hood 42 and the outlet hood 4 are not shown.
3 may be formed integrally.

[0041]

As described above in detail, in the case cooling system according to the present invention, since the inside of the case can be ventilated by the inside air fan and the outside air fan of the auxiliary cooling device, the auxiliary cooling device and In comparison with the case where a ventilation fan and an exhaust damper are separately provided, the required installation space for the equipment can be reduced, the number of installation equipment can be reduced, and the time for examining the installation position of the equipment can be reduced.

Further, since the inside air fan and the outside air fan are stopped based on at least the outside air temperature, unnecessary rotation caused by rotation of the inside air fan and the outside air fan when the cooling capacity of the auxiliary cooling device is not sufficiently exhibited. Operation costs can be avoided.

When the inside air temperature in the housing rises, the auxiliary cooling device is switched from the normal cooling operation to the ventilation operation, so that the heat-generating components can be effectively protected.

Further, when a fire occurs in the housing, an abnormal rise in the inside air temperature is detected, and the fire prevention damper cuts off the air passage, so that it is possible to prevent the spread of fire to the outside of the housing.

Further, by forming the natural circulation refrigerant circuit with a heat pipe, the thickness of the auxiliary cooling device can be reduced while ensuring the same cooling performance, so that the appearance outside the housing is reduced by reducing the unevenness of the housing. Can be better.

In the event of a power failure, the inside air fan and the outside air fan are rotated by the electric power supplied from the battery power supply. Therefore, even if the main cooling device is stopped, the cooling by the auxiliary cooling device can be continued, and furthermore, it is necessary. The ventilation operation can also be performed according to the above, so that the heat-generating components can be more reliably protected.

Further, since the outside air suction port at the time of ventilation operation is provided on the bottom surface of the auxiliary cooling device, even if the ventilation operation is performed in rainy weather, rain does not enter the housing, and adverse effects on the heat-generating components are prevented. Can be avoided.

Further, since a hood is attached to the air suction port and the air outlet of the outside air fan during the cooling operation, a so-called short cycle occurs in which the hot air exchanged by the evaporator is sucked again during the normal cooling operation. In addition, it is possible to prevent rain from entering the housing due to the wind even when ventilation operation is performed during bad weather such as a typhoon.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a state during a cooling operation of a case cooling system according to Embodiments 1 to 8 of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a state of a casing cooling system according to Embodiments 1 to 8 of the present invention during a ventilation operation.

FIG. 3 is a schematic configuration diagram illustrating a state of a cooling operation of an auxiliary cooling device included in the case cooling system according to Embodiments 1 to 7 of the present invention.

FIG. 4 is a schematic configuration diagram illustrating a state of an auxiliary cooling device included in the case cooling system according to Embodiments 1 to 7 of the present invention during a ventilation operation.

FIG. 5 is a schematic configuration diagram illustrating a state of a cooling operation of an auxiliary cooling device included in a housing cooling system according to an eighth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram illustrating a state of an auxiliary cooling device included in a case cooling system according to an eighth embodiment of the present invention during a ventilation operation.

FIG. 7 is a schematic configuration diagram showing a conventional case cooling system.

[Explanation of symbols]

1 enclosure cooling system, 3 enclosures, 5 heat-generating components, 9
Auxiliary cooling device, 10 main cooling device, 15 natural circulation refrigerant circuit, 16 forced circulation refrigerant circuit, 23 inside air temperature detecting means, 25 inside air side fan, 26 outside air side fan, 27
Evaporator, 28 condenser, 29 damper, 30 damper, 3
1 outside air suction port, 35 fan control means, 36 outside air temperature detection means, 38 operation switching control means, 39 inside air temperature abnormality detection means, 40 suction port, 41 outlet, 42 inlet hood, 43 outlet hood, 48 suction air Road, 4
9 Discharge airway.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Negoro 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Masahiko Sugino 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 Rishi Electric Co., Ltd. F-term (reference) 3L056 BA06

Claims (8)

[Claims] 1. A case cooling system for cooling an inside of a case accommodating a heat generating component by a main cooling device having a forced circulation refrigerant circuit and an auxiliary cooling device having a natural circulation refrigerant circuit, The cooling device includes an inside air side fan that allows the inside air inside the housing to ventilate the evaporator of the natural circulation refrigerant circuit, and an outside air side fan that allows the outside air outside the housing to ventilate the condenser of the natural circulation refrigerant circuit. Wherein the auxiliary cooling device sucks outside air into the housing by the inside air side fan and discharges inside air to the outside of the housing by the outside air side fan, in addition to the normal cooling operation using the natural circulation refrigerant circuit. A housing cooling system configured to perform a ventilation operation. 2. An outside air temperature detecting means for detecting an outside air temperature outside the housing, and an inside air side fan and an outside air side fan based on at least the temperature detected by the outside air temperature detecting means when the auxiliary cooling device is performing a cooling operation. 2. The housing cooling system according to claim 1, further comprising fan control means for stopping the operation of the housing. 3. An inside air temperature detecting means for detecting the inside air temperature in the housing, and an operation switching control means for switching the operation state of the auxiliary cooling device from the cooling operation to the ventilation operation based on the temperature detected by the inside air temperature detecting means. The housing cooling system according to claim 1 or 2, further comprising: 4. An inside air temperature abnormality detecting means for detecting an abnormal rise in the inside air temperature in the housing, and the inside air temperature abnormality detecting means detecting an abnormal rise in the inside air temperature when the auxiliary cooling device is performing a ventilation operation. The case according to any one of claims 1 to 3, further comprising a fire damper that shuts off an air passage for the outside air into the housing and a discharge air passage for the inside air to the outside of the housing. Body cooling system. 5. The case cooling system according to claim 1, wherein the natural circulation refrigerant circuit of the auxiliary cooling device is constituted by a heat pipe. 6. A battery power supply for supplying power to the inside air fan and the outside air fan in the event of a power failure.
Item 6. The case cooling system according to any one of items 5 to 5. 7. The auxiliary cooling device is provided so as to protrude outward from a side surface of the housing, and a bottom surface of the protruding portion of the auxiliary cooling device is formed with an outside air suction port for sucking outside air during a ventilation operation. Item 7. A housing cooling system according to any one of Items 1 to 6. 8. The hood that opens downward, respectively, to the air inlet and outlet of the outside air fan during the cooling operation of the auxiliary cooling device. A housing cooling system according to any one of the above.