JP2001041503A - Case cooling system for communication base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a case cooling system for a communication base station which can optimize equipment capacity for saving energy and improve reliability of the equipment, by suitably combining a boiling type cooler of a natural circulation refrigerant circuit and an evaporator of a forced circulation refrigerant circuit. SOLUTION: A case cooling system 1 provides a system in which the inside of a case 3 of a communication base station 2 accommodating a communication apparatus 4 including a heat generating part 5 is cooled by a boiling type cooler 21 of a natural circulation refrigerant circuit 20, and by an evaporator 13 of a forced circulation refrigerant circuit 9 by a compressor 10. The system comprises a common airflow path 30 having a heat suction port 32 for taking in heat from the case 3, and a cooling air diffuser for blowing cooling air into the case 3. The common airflow path 30 is incorporated with the boiling type cooler 2, the evaporator 13 and a common fan 31 for blowing air to the boiling type cooler 21 and the evaporator 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boil-type cooler for a natural circulation refrigerant circuit and an evaporator for a forced circulation refrigerant circuit using a compressor. The present invention relates to an improvement of a casing cooling system for a communication base station that cools a communication base station.

[0002]

2. Description of the Related Art A large number of communication base stations such as mobile phones are installed in urban areas, on the roofs of condominiums and office buildings, as well as on the summits and wilderness of suburbs. This communication base station generally has communication equipment housed in a sealed housing. However, there are cases where the space is too small to allow a person to enter, and the communication device is appropriately cooled since the communication device has a heat-generating component. As such a case cooling system for cooling the inside of the case, Japanese Patent Laid-Open No.
One disclosed in Japanese Patent Publication No. -135972 is known. FIG. 4 shows a housing cooling system disclosed in the above publication. The illustrated casing cooling system 51 of the communication base station 52 cools the inside of the casing 3, which is a closed space, by the boiling type cooler 21 of the natural circulation refrigerant circuit 20 and the evaporator 13 of the forced circulation refrigerant circuit 9. Is configured. Forced circulation refrigerant circuit 9
Is generally used in an air conditioner or the like, in which a refrigerant is forcibly circulated by a compressor 10. In addition, case 3
The communication device 4 including the heat-generating component 5 is housed therein.
In a general communication device 4, a fan (not shown) is provided in a device case 6 containing a heat-generating component 5, and air is taken into the case from an air inlet 7 on the side surface or the bottom surface of the case. Hot air is blown out from the exhaust port 8. An evaporator case 53, which is an indoor unit casing of an air conditioner, is provided with a suction port 55 for sucking air in the housing 3 and a cool air outlet 56 for blowing cool air into the housing 3. , An evaporator 13 and a fan 54. On the other hand, a hot air guide path 57 communicating with the exhaust port 8 is formed on the back side of the device case 6, and the hot air guide path 57 is formed with a hot air inlet 58 and an outlet 64.
Is connected to the ventilation passage 67 having The condenser 22 and the fan 63 are built in the ventilation path 67.

[0003] The condenser 11 of the forced circulation refrigerant circuit 9 is provided in a condenser case 17 as an outdoor unit of an air conditioner. The condenser case 17 includes an outside air inlet 18 and an exhaust port 1.
9 and is formed in a box shape having the condenser 1
1, a compressor 10, a refrigerant throttle valve 12, and a fan 16. Then, the compressor 1 in the condenser case 17
0, condenser 11, refrigerant throttle valve 12, evaporator 1 in housing 3
The forcible circulation refrigerant circuit 9 is configured by the ring 3 being sequentially connected in a ring shape through the refrigerant pipes 14 and 15. Further, the condenser 22 of the natural circulation refrigerant circuit 20 is provided in a condenser case 59 as an outdoor unit. Condenser case 59
Is formed in a box shape having an outside air intake port 60 and an exhaust port 61, and includes the condenser 22 and the fan 62 described above. Then, the condenser 22 in the condenser case 59 and the boiling type cooler 21 in the ventilation path 67 are connected in a ring shape through the refrigerant vapor pipe 23 and the liquid refrigerant return pipe 24 so that the natural circulation refrigerant circuit 20 is formed. Is configured. In the conventional cooling system, the cooling capacity is determined according to the maximum load of the heat-generating component 5. Since the housing 3 generally has a structure in which heat flow is extremely small, the housing 3 due to a change in outside air temperature may be used.
There is almost no change in the internal cooling load.

Next, the operation of the conventional system will be described. First, by driving a fan (not shown) in the communication device 4,
The air in the housing 3 is taken into the equipment case 6 from the air inlet 7. The taken-in cool air cools the heat-generating component 5 to become hot air, and the hot air guide path 57 extends from the exhaust port 8 at the back of the case.
It is blown out inside. The hot air blown out in this manner is sucked into the ventilation passage 67 through the hot air suction port 58 by the blowing of the fan 63. In the ventilation passage 67, the hot air is cooled by the boiling type cooler 2.
1 and is primarily cooled by heat exchange with the refrigerant in the natural circulation refrigerant circuit 20. The air after the primary cooling is sucked by the fan 63 and then blown out of the outlet 64 into the housing 3. At least a part of the blown air after the primary cooling is transferred from the suction port 55 into the evaporator case 53 by the fan 5.
The air is sucked by the air blow of No. 4, passes through the evaporator 13, and is cooled by heat exchange with the refrigerant in the forced circulation refrigerant circuit 9. The air thus cooled is blown out as cold air from the cool air outlet 56 into the housing 3.

Here, in the natural circulation refrigerant circuit 20, the refrigerant of the boiling type cooler 21 boils due to heat exchange with hot air to become a gas refrigerant, and passes through the refrigerant vapor pipe 23 through the condenser 2
To 2. The gas refrigerant in the condenser 22 is supplied to the fan 62
As a result, the inside of the condenser case 59 is cooled by heat exchange with the outside air flowing from the outside air suction port 60 to the exhaust port 61 to become a liquid refrigerant. The liquid refrigerant returns to the boiling type cooler 21 via the liquid refrigerant return pipe 24 by natural flow due to a difference in specific gravity from the gas refrigerant. On the other hand, in the forced circulation refrigerant circuit 9, the compressor 1
The high-temperature and high-pressure gas refrigerant forcedly discharged from 0 flows into the condenser 11, and is cooled by heat exchange with the outside air flowing from the outside air suction port 18 to the exhaust port 19 through the inside of the condenser case 17 by the fan 16. It becomes a liquid refrigerant. The liquid refrigerant is decompressed by the refrigerant throttle valve 12 to be in a gas-liquid two-phase state, and the refrigerant pipe 14
Through the evaporator 13. The refrigerant exchanges heat with the air flowing through the evaporator case 53 in the evaporator 13 to become a low-pressure gas refrigerant, and returns to the suction side of the compressor 10 via the refrigerant pipe 15.

[0006]

By the way, in the conventional cooling system, the boiling type cooler 21 and the evaporator 1 are used.
3 are provided in separate ventilation paths, so that fans 63 and 54 need to be individually provided for each ventilation path. In addition, since the component mounting density inside the housing 3 is high due to the demand for compactness, the installation space cannot be increased even when the number of installed fans increases. Therefore, there is a problem that a large fan cannot be used, and a large air volume cannot be obtained when the space in the housing 3 is the same, for example. On the other hand, the boiling type cooler 21
Since the air primarily cooled by the air diffuses in the housing 3 after exiting the air outlet 64, not only the air going to the evaporator case 53 as shown by the arrow C, but also the communication by bypassing it as shown by the arrow B It may be sucked into the air intake 7 of the device 4. On the other hand, if the air volume of the fan 54 is too large, the cool air blown out from the cool air outlet 56 may cause a short cycle and return to the suction port 55, thereby deteriorating the cooling efficiency. Furthermore, it is necessary to provide a hot air guide path 57 and a hot air suction port 58 for taking in hot air into the boiling type cooler 21,
The air path configuration is complicated. Conversely, if the hot air guide path 57 is not provided, high-temperature hot air blown out from the exhaust port 8 of the communication device 4 may be sucked directly into the suction port 55 of the evaporator 13 bypassing the boiling cooler 21. This may lead to failure of the forced circulation refrigerant circuit 9.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to appropriately combine a boiling type cooler of a natural circulation refrigerant circuit, an evaporator of a forced circulation refrigerant circuit, and a fan. Accordingly, it is an object of the present invention to provide a casing cooling system for a communication base station, which can optimize energy consumption by optimizing equipment capacity and improve equipment reliability.

[0008]

In order to achieve the above-mentioned object, a communication base station casing cooling system according to the present invention comprises a communication base station housing a communication device including a heat-generating component. In a system designed to be cooled by a boiling type cooler of a refrigerant circuit and an evaporator of a forced circulation refrigerant circuit by a compressor, a hot air inlet for taking in hot air in a housing and a cool air outlet for blowing cool air into the housing. A common ventilation path is provided, and the common ventilation path includes a boiling cooler, an evaporator, and a common fan for sending air to the boiling cooler and the evaporator.

[0009] In the above structure, the common ventilation path includes a cooler-side air path with a built-in boiling cooler, an evaporator-side air path with a built-in evaporator, a cooler-side air path, and an evaporator-side air path. And a connecting air path connecting the air paths.

[0010] In addition to the above components, a temperature detecting means for detecting at least the outside air temperature, and a compressor controlling means for stopping the operation of the compressor of the forced circulation refrigerant circuit based on the temperature detected by the temperature detecting means. It is provided with.

Further, in addition to the above-mentioned respective structures, an abnormality detecting means for detecting an abnormality in the forced circulation refrigerant circuit, and an operation for holding the common fan in an operating state when the abnormality detecting means detects an abnormality in the forced circulation refrigerant circuit. Holding means.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 of the Invention FIG. 1 shows Embodiments 1 and 3 of the present invention.
FIG. 4 is a schematic configuration diagram illustrating a casing cooling system of a communication base station according to a fourth embodiment. However, the same reference numerals are given to the components substantially common to the conventional case cooling system 51 shown in FIG.
The detailed explanation may be omitted. In the figure, a casing cooling system 1 includes a boiling type cooler 2 of a natural circulation refrigerant circuit 20.
1 and the evaporator 13 of the forced circulation refrigerant circuit 9 for forcibly circulating the refrigerant by the compressor 10 so as to cool the inside of the housing 3 of the communication base station 2 forming a closed space. A communication device 4 including a heat-generating component is housed in the housing 3. In the case cooling system 1, a common ventilation path 30 is provided in the case 3. The common ventilation path 30 is realized by a hollow box-shaped common case 29 having a hot air inlet 32 for taking in hot air in the housing 3 and a cool air outlet 33 for blowing cool air into the housing 3. In the common ventilation passage 30, the boiling cooler 21 of the natural circulation refrigerant circuit 20, the evaporator 13 of the forced circulation refrigerant circuit 9, and the boiling cooler 2
1 and a common fan 31 for blowing air to the evaporator 13 are incorporated.

The condenser 11 of the forced circulation refrigerant circuit 9 is provided in a condenser case 17 as an outdoor unit. The condenser case 17 is formed in a box shape having an outside air intake port 18 and an exhaust port 19, and includes the condenser 11, the compressor 10, the refrigerant throttle valve 12, and the fan 16. That is, the compressor 10, the condenser 11, the refrigerant throttle valve 12, and the evaporator 1 in the common ventilation passage 30 in the condenser case 17
The forcible circulation refrigerant circuit 9 is configured by the ring 3 being sequentially connected in a ring shape through the refrigerant pipes 14 and 15. The condenser 22 of the natural circulation refrigerant circuit 20 is provided in a condenser case 25 as an outdoor unit. The condenser case 25 is formed in a box shape having an outside air suction port 27 and an exhaust port 28, and includes the condenser 22 and the fan 26.
That is, the condenser 22 in the condenser case 25 and the boiling-type cooler 21 in the common ventilation path 30 are connected in a ring shape through the refrigerant vapor pipe 23 and the liquid refrigerant return pipe 24, so that the natural circulation refrigerant circuit is provided. 20 are configured.

Subsequently, the communication base station 2 having the above configuration
The operation of the case cooling system 1 will be described. First, by driving a fan (not shown) in the communication device 4, the cool air at the position A on the side of the device case 6 is taken into the case from the air inlet 7. The taken-in cool air cools the heat-generating component 5 and becomes hot air, and is discharged from the exhaust port 8 at the top of the case to the housing 3.
It is blown out to the position of c in. The hot air blown out in this way is sucked into the common ventilation passage 30 from the position of (d) through the hot air suction port 32 by the blowing of the common fan 31. The hot air passes through the evaporative cooler 21 in the common ventilation passage 30 and exchanges heat with the refrigerant in the natural circulation refrigerant circuit 20, thereby causing the hot air to flow out of the air.
Next, it is cooled. The air after the primary cooling at the position (e) is sucked by the shared fan 31 and then the whole amount passes through the evaporator 13 and is cooled by heat exchange with the refrigerant in the forced circulation refrigerant circuit 9.
The air cooled in this way is used as cold air,
Is blown out to the position A in the housing 3. That is, the air circulates in the order of A → A → U → D → O to cool the inside of the housing 3.

Incidentally, in the refrigerant system of the natural circulation refrigerant circuit 20,
The refrigerant in the evaporative cooler 21 boils due to heat exchange with hot air to become a gas refrigerant and reaches the condenser 22 through the refrigerant vapor pipe 23. In the condenser 22, the gas refrigerant flows through the inside of the condenser case 25 from the outside air suction port 27 to the exhaust port 28 by the fan 26.
Is condensed by heat exchange with the outside air flowing to the liquid refrigerant, and becomes a liquid refrigerant. The liquid refrigerant returns to the boiling cooler 21 through the liquid refrigerant return pipe 24 by natural flow due to a difference in specific gravity from the gas refrigerant. On the other hand, in the refrigerant system of the forced circulation refrigerant circuit 9, high-temperature and high-pressure gas refrigerant forcibly discharged from the compressor 10 flows into the condenser 11, and the inside of the condenser case 17 is moved by the fan 16 into the outside air suction port 18. Is cooled by heat exchange with the outside air flowing from the air to the exhaust port 19 to become a liquid refrigerant. The liquid refrigerant is decompressed by the refrigerant throttle valve 12 to be in a gas-liquid two-phase state, and reaches the evaporator 13 through the refrigerant pipe 14. This refrigerant is the evaporator 1
In 3, heat exchange is performed with the air after the primary cooling, and the gas itself becomes a low-pressure gas refrigerant, and returns to the suction side of the compressor 10 via the refrigerant pipe 15. The capacity of the compressor 10 is controlled based on the air temperature at the position o in the common ventilation passage 30.

As described above, according to the casing cooling system 1 of this embodiment, since the boiling cooler 21 and the evaporator 13 are provided in the single common ventilation path 30, one unit is provided. It is only necessary to provide the common fan 31 in the common ventilation path 30. In addition, since a fan installation space, which conventionally required two fans, can be used for one fan, a large air volume fan can be adopted as the shared fan 30. Thereby, the capacity of the natural circulation refrigerant circuit 20 can be used to a large extent. On the other hand, the air primarily cooled by the boiling type cooler 21 is always guided to the evaporator 13 and is surely cooled.
High cooling efficiency can be realized without contributing to energy saving without causing air bypass or short cycle in the housing 3 unlike the related art. In addition, since the hot air is not directly sucked into the evaporator 13, the failure of the forced circulation refrigerant circuit 9 can be avoided. Also,
The hot air guide path 57 (see FIG. 4) unlike the conventional system is not absolutely required. From the above, it is possible to reduce the number of installed fans and the running cost. As a result, it is possible to reduce the total cooling capacity of the equipment and to improve the reliability of the entire cooling system at the same time as saving energy, and also to reduce noise due to the reduction in the operating capacity of the compressor 10.

Incidentally, in order to improve the efficiency of the present system or to prevent dew condensation in the housing 3,
It is effective to increase the temperature inside the housing as long as the required use environment temperature of the communication device 4 and the like permits. However, if the temperature inside the housing is increased (about 30 ° C.), the air temperature at the position of c which is blown out from the device case 6 increases (4).
0 ° C.), when air at that temperature is directly sucked into a normal air conditioner indoor unit (for example, the evaporator case 53 in FIG. 4),
The operation guarantee range (for example, 35 ° C.) of the air conditioner indoor unit will be exceeded. Therefore, as described above, the evaporator 13 and the evaporator 13 are arranged in combination with each other.
This helped to keep the intake temperature within the guaranteed range, which in turn led to improved reliability of the cooling system. In addition, the boiling type cooler 21 in the common case 29 exhibits higher performance as the difference between the temperature of the intake air at the position d and the temperature of the outside air at the position of the suctioned air into the condenser 22 is larger. Since it has a function (see FIG. 3), it is efficient to exchange heat with hot air near the heat-generating component 5 as much as possible. For this purpose, it is preferable to arrange the hot air inlet 32 of the common case 29 at a position directly above the heat generating component 5.
As a result, the temperature of the hot air blown out from the exhaust port 8 of the communication device 4 at the position of c is substantially maintained while the common ventilation path 3 is maintained.
It can be the air at the position of d that is sucked into zero.

Embodiment 2 of the Invention FIG. 2 is a schematic configuration diagram illustrating a casing cooling system of a communication base station according to Embodiment 2 of the present invention. The difference between the case cooling system 1a of the communication base station 2a shown in FIG.
The common ventilation passage 30a is composed of a cooler-side air passage 48 containing the boiling cooler 21 and an evaporator-side air passage 5 containing the evaporator 13.
0, and a connecting air path 49 connecting the cooler-side air path 48 and the evaporator-side air path 50. Specifically, the outlet 46 of the cooler case 43 containing the boiling cooler 21 and the suction port 47 of the evaporator case 45 containing the evaporator 13 are connected by a connection duct 44, Inside these, a common ventilation path 30a is formed. The operation of the case cooling system 1a is almost the same as that of the first embodiment, and thus the description is omitted.

When configured as the casing cooling system 1a, the air conditioner indoor unit (the evaporator case 45 having the inlet 47 and the cool air outlet 33, the evaporator 13 And the shared fan 31) can be diverted as it is.

It is also possible to form a suction side space 66 by providing partition walls 65 between the equipment case 6 and the cooler case 43 and between the inner surface of the housing 3 and the cooler case 43. . Incidentally, when the partition wall 65 is not provided, it becomes possible to install a plurality of communication devices 4 having the heat-generating components 5 inside the housing 3.

Embodiment 3 of the Invention In the case cooling system 1 according to the third embodiment, as shown in FIG. 1, a control device 38 including, for example, a microcomputer is provided. In this example, the control device 38 has a function of a compressor control means 40 described later. Also,
The casing cooling system 1 includes a temperature detecting means 34 for detecting an outside air temperature and a temperature detecting means for detecting a temperature in the casing (preferably, a temperature in the vicinity of the exhaust port 8 of the device case 6 or the hot air inlet 32 of the common case 29). Means 35.

Therefore, when the temperature detecting means 34 detects the outside air temperature and the temperature detecting means 35 detects the inside temperature of the casing, the compressor control means 40 calculates the temperature difference between the detected inside temperature and the outside air temperature. . Next, the compressor control means 4
0 stops the operation of the compressor 10 of the forced circulation refrigerant circuit 9 based on the obtained temperature difference. Specifically, the relationship data between the capacity (kW) of the natural circulation refrigerant circuit 20 as shown in FIG. 3 and the temperature difference between the inside temperature and the outside air temperature is set and stored in advance in the memory of the control device 38. The required capacity of the natural circulation refrigerant circuit 20 is determined from the temperature difference calculated from each detected temperature. Therefore, the compressor control means 40 forcibly operates the compressor 10 of the forced circulation refrigerant circuit 9 when the calculated required capacity of the natural circulation refrigerant circuit 20 falls below the set capacity value of the related data under the same condition. The operation is stopped, and the operation of only the natural circulation refrigerant circuit 20 is continued.

That is, in the system of this embodiment, when the inside of the housing 3 can be cooled only by the capacity of the natural circulation refrigerant circuit 20, the compressor 10 can be operated regardless of the air temperature at the position o.
Is not operated, it is possible to avoid unnecessary expenditure of the operation cost of the forced circulation refrigerant circuit 9. Incidentally, the lower the outside air temperature is, the greater the capacity of the natural circulation refrigerant circuit 20 is, and the load on the forced circulation refrigerant circuit 9 can be reduced. For example, when the natural circulation refrigerant circuit 20 having the characteristics as shown in FIG. 3 is designed, the cooling capacity when the temperature difference Δt = 25 ° C. (for example, when the outdoor temperature is 15 ° C. and the temperature inside the housing is 40 ° C.) It becomes 4.0 kW. In other words, if the outside air temperature is set to severe midsummer conditions and the capacity of the natural circulation refrigerant circuit 20 is designed, the forced circulation refrigerant circuit 9 is used in winter and the middle period.
The operating capacity on the side can be greatly reduced, and the running cost can be reduced. Alternatively, the amount of boiling cooling in the natural circulation refrigerant circuit 20 is
Can be allocated to the side's capacity reduction.

It is needless to say that the control mode of this embodiment can be applied to not only the case cooling system 1 of FIG. 1 but also the case cooling system 1a of FIG. Further, when the heat generation load in the housing hardly changes throughout the year, the operation of the compressor 10 can be stopped based only on the outside air temperature detected by the temperature detecting means 34. Since the temperature detecting means 35 can be omitted, the control configuration can be simplified and the cost can be reduced.

Embodiment 4 of the Invention In the case cooling system 1 according to the fourth embodiment, as shown in FIG.
A pressure detecting means 36 for detecting the low-pressure refrigerant pressure on the suction side of the compressor 10 and a pressure detecting means 37 for detecting the high-pressure refrigerant pressure on the discharge side of the compressor 10 are provided. Further, the control device 38 has a function of an abnormality detection unit 41 for detecting an abnormality of the forced circulation refrigerant circuit 9 based on the detected pressures of the pressure detection units 36 and 37, and a function of the abnormality detection unit 41 of the forced circulation refrigerant circuit 9. When an abnormality is detected, the shared fan 31
In the operation state.

Therefore, according to this embodiment system,
When the difference between the pressures detected by the pressure detecting means 36 and 37 is larger than a predetermined value, the abnormality detecting means 41 detects an abnormality in the forced circulation refrigerant circuit 9. And abnormality detection means 4
1 stops the compressor 10 urgently. At the same time, the abnormality detecting means 41 keeps the common fan 31 in the operating state and continues the air blowing. Even in such a case, since the natural circulation refrigerant circuit 20 is always operating, the air is sent to the boiling type cooler 21 by the operation holding of the common fan 31. That is, even when the forced circulation refrigerant circuit 9 is stopped due to an abnormality, the air cooled by the boiling cooler 21 is blown into the housing 3, so that the temperature inside the housing 3 does not boil. . However, instead of the pressure detecting means 36 and 37, the refrigerant temperature on the discharge side of the compressor 10 may be detected, and the abnormality of the forced circulation refrigerant circuit 9 may be detected based on the detected temperature. Further, an abnormality detecting means other than pressure detection can be similarly configured. The control mode of this embodiment is applicable not only to the casing cooling system 1 of FIG. 1 but also to the casing cooling system 1a of FIG.

In each of the embodiments described above, an example is shown in which the common ventilation passages 30 and 30a are provided inside the housing 3.
The present invention is not limited to this.
The common case 29, the cooler case 43, the connection duct 44, and the evaporator case 45 of 0, 30a are externally attached to the housing 3,
It is also possible to connect the hot air inlet 32 and the cool air outlet 33 by penetrating into the housing 3. In addition, shared fan 3
1 was disposed between the boiling cooler 21 and the evaporator 13,
The present invention is not limited to this, and the common fan 31 may be disposed in the common ventilation passages 30 and 30 a on the upstream side in the ventilation direction of the boiling cooler 21 or on the downstream side in the ventilation direction of the evaporator 13.

[0028]

As described above in detail, according to the casing cooling system for a communication base station according to the present invention, the boiling cooler and the evaporator are provided in a single common ventilation path. , 1
It is only necessary to provide two shared fans. Therefore, it is possible to reduce the number of installed fans and the running cost. In addition, since a fan installation space, which conventionally required two units, can be used for one unit, a large air volume fan can be adopted as a shared fan. Thereby, the capacity of the natural circulation refrigerant circuit can be utilized to a large extent. On the other hand, the air that has been primarily cooled by the boiling type cooler is always guided to the evaporator and is surely cooled, so that there is no occurrence of a bypass or a short cycle in the housing unlike the prior art, and high cooling efficiency is achieved. And contribute to energy saving. Moreover, since the primary cooled air is sucked into the evaporator, a failure of the forced circulation refrigerant circuit that occurs when hot air is sucked as it is can be avoided.

Further, a cooler side air path, an evaporator side air path,
When a common ventilation path is configured from the connecting air path connecting these, if the common fan is provided in the evaporator side air path, the air conditioner indoor unit of the forced circulation refrigerant circuit is diverted as it is. be able to. Conversely, when a common fan is provided in the cooler side air passage, the use side cooler of the natural circulation refrigerant circuit can be diverted as it is.

When the compressor control means determines that the inside of the housing can be cooled only by the capacity of the natural circulation refrigerant circuit based on at least the detected temperature of the outside air, the compressor is not operated. Avoid unnecessary operating cost expenditures.

Further, when the control structure is such that the shared fan is maintained in the operating state when the abnormality of the forced circulation refrigerant circuit is detected, the natural circulation refrigerant circuit is always operating, so that the abnormality of the forced circulation refrigerant circuit is caused. Even if the compressor is automatically shut down by the detection, by operating the common fan, the air in the common ventilation passage is cooled by the boiling type cooler of the natural circulation refrigerant circuit and blown out into the housing. Thereby, it is possible to cope with the situation without the temperature in the housing rising rapidly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a casing cooling system of a communication base station according to Embodiments 1, 3, and 4 of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a casing cooling system of a communication base station according to a second embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a capacity of a natural circulation refrigerant circuit used in a casing cooling system of a communication base station according to a third embodiment of the present invention, an outside air temperature, and the like.

FIG. 4 is a schematic configuration diagram illustrating a housing cooling system of a communication base station according to the related art.

[Explanation of symbols]

1 enclosure cooling system, 1a enclosure cooling system, 2
Communication base station, 2a Communication base station, 3 chassis, 4 communication equipment, 5 heating components, 9 forced circulation refrigerant circuit, 10 compressor, 13 evaporator, 20 natural circulation refrigerant circuit, 21 boiling cooler, 30 common ventilation Road, 30a shared ventilation path,
31 common fan, 32 hot air inlet, 33 cool air outlet, 34 temperature detecting means, 36 pressure detecting means, 37
Pressure detection means, 38 control device, 40 compressor control means, 41 abnormality detection means, 42 operation holding means, 48
Cooler side air path, 49 Connecting air path, 50 Evaporator side air path.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Seshita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 3L054 BG04 BG08 BH01

Claims (4)

[Claims] 1. The inside of a communication base station housing communication equipment including heat-generating components is cooled by a boiling type cooler of a natural circulation refrigerant circuit and an evaporator of a forced circulation refrigerant circuit by a compressor. In the system, a common air passage having a hot air inlet for taking in hot air in the housing and a cool air outlet for blowing cool air into the housing is provided, and the boiling cooler, the evaporator, and the boiling cooler are provided. A case cooling system for a communication base station, wherein a common fan for sending air to the evaporator is built in the common ventilation path. 2. The common ventilation path includes a cooler-side air path including a boiling-type cooler, an evaporator-side air path including an evaporator, the cooler-side air path, and the evaporator-side air path. 2. The case cooling system for a communication base station according to claim 1, wherein the case cooling system comprises a connecting air path to be connected. 3. A system comprising: a temperature detecting means for detecting at least an outside air temperature; and a compressor control means for stopping operation of a compressor of a forced circulation refrigerant circuit based on a temperature detected by the temperature detecting means. The case cooling system for a communication base station according to claim 1 or 2, wherein 4. An abnormality detecting means for detecting an abnormality in the forced circulation refrigerant circuit, and an operation holding means for holding the common fan in an operating state when the abnormality detecting means detects an abnormality in the forced circulation refrigerant circuit. 4. The case cooling system for a communication base station according to claim 1, wherein the case cooling system comprises: