Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Reexamination Certificate
2000-06-15
2003-04-01
Walberg, Teresa (Department: 3742)
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
C062S132000
Reexamination Certificate
active
06539736
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for controlling to cool a communication station, wherein an inside of the communication station, accommodating communication equipments including heat elements such as boards, are cooled by a cooling device such as an air conditioner.
The present invention also relates to an improvement of a system for cooling a casing of a communication station, wherein an inside of the casing, accommodating communication equipments including heat components, is cooled by a boiling type cooler in a natural circulation refrigerating circuit and an evaporator in a forced circulation refrigerating circuit, circulated by a compressor.
2. Discussion of Background
In recent years, communication stations including a large number of electronical boards for communication are located in various places for relaying communications along with expanding popularization of portable communication apparatuses. Dimensions of such communication relay stations are, for example, a width of about 6 m, a depth of about 1.7 m, and a height of about 1.7 m. Although the communication relay stations are relatively small, a gloss colorific value of electronical boards, equipped in the communication stations, are several kW through several dozens of kW. Therefore, air conditioners are used to cool these electronic boards by cooling board casings of the communication stations.
FIG. 33
illustrates a structure of a conventional method for controlling to cool a communication station. In
FIG. 33
, numerical reference
1
designates a rack accommodating a communication equipments including a large number of electronic boards and so on; numerical reference
3
designates a fan; numerical reference
4
designates an indoor unit including an indoor heat exchanger
4
a
and an indoor fan
4
b
; numerical reference
5
designates an outdoor unit including a compressor
5
a
and an outdoor heat exchanger
5
b
; numerical reference
6
designates a suction air into the indoor heat exchanger
4
a
; numerical reference
7
designates a blown-out air from the indoor heat exchanger
4
a
; numerical reference
8
designates a suction air for cooling the communication equipment
2
; numerical reference
9
designates a suction air temperature detector for detecting a temperature of the suction air
6
; numerical reference
10
designates a casing for accommodating the lack
1
and the indoor unit
4
; and numerical reference
11
designates a cooling controller for controlling a cooling capability of the compressor
5
a.
In the next, an operation of the conventional method for controlling to cool the communication station will be described. The number of operating communication equipments
2
is changed in response to a frequency of communication, and a colorific value is increased or decreased in response to the number of operating communication equipments
2
. The suction air
8
to the communication equipments
2
is sent by the fan
3
to cool the communication equipments
2
, is heated after cooling, and is taken in the indoor unit
4
as the suction air
6
into the indoor heat exchanger
4
a
. The suction air
6
, taken into the indoor unit
4
, is cooled by the indoor heat exchanger
4
a
, is blown out into the casing
10
as the blown-out air
7
from the indoor heat exchanger
4
a
, and is served as the suction air
8
into the communication equipments
2
. On the other hand, the cooling controller
11
controls a cooling capability of the compressor
5
a
based on an output temperature of the suction air temperature detector
9
so that the suction air
8
into the communication equipments
2
becomes a predetermined temperature, for example, 35° C. or less.
Further, a large number of communication stations for handy personal phones and so on are located in cities, rooftops of condominiums and office buildings, mountain tops in the suburbs, and wilds. Communication equipments are generally accommodated in a sealed casing in the communication stations. However, some of casings have a space too narrow to receive a person. Therefore, the casings are adequately cooled because heat components are included in the communication equipments.
As a system for cooling such a casing is disclosed in Japanese Unexamined Patent Publication JP-A-11-135972.
FIG. 34
illustrates this system. The casing cooling system
151
for a communication station
152
is composed of a boiling type cooler
121
in a natural circulation refrigerating circuit
120
and an evaporator
113
in a forced circulation refrigerating circuit
109
so as to cool an inside of the casing
103
as the sealed space. The forced circulation refrigerating circuit
109
is constructed to forcibly circulate a refrigerant by a compressor
110
, which mechanism is generally used in an air conditioner and so on. Communication equipments
104
including heat components
105
are accommodated in the casing
103
. In generally used communication equipments
104
, a fan (not shown) is located inside an equipment case
106
having built-in heat components
105
to take an air from an intake port
107
, located on a side surface or a bottom surface of the equipment case, and to blow a heat out of an exhaust port
108
, positioned on a back of the equipment case.
In a case of an evaporator, an intake port
155
for taking an air inside the casing
103
and an exhaust port for blowing a cooled air into the casing
103
are formed. In the case
153
of the evaporator, the evaporator
113
and a fan
154
are built. On the other hand, on a back surface of the equipment case
106
, a heated air guide path
157
, connected to the exhaust port
108
, is formed. The heated air guide path
157
is connected to an air path
167
having a heated air intake port and a heated air exhaust port. A condenser
122
and a fan
163
are built in the air path
167
.
A condenser
111
in the force circulation refrigerating circuit
109
is located in a case of a condenser as an outdoor unit of an air conditioner. The case
117
of the condenser is formed like a box having an outer air intake port
118
and an exhaust port
119
. The condenser
111
, the compressor
110
, a choke valve
112
for refrigerant, and a fan
116
are housed in the case
117
of the condenser. The forced circulation refrigerating circuit
109
is constructed by sequentially connecting the compressor
110
, the condenser
111
, the refrigerant choke valve
112
in the condenser case
117
with the evaporator
113
in the casing
103
via tubes
114
,
115
for the refrigerant so as to be shaped like a ring. Further, the condenser
122
in the natural circulation refrigerating circuit
120
is disposed in the condenser case
159
as an outdoor unit. The condenser case
159
is shaped like a box having an outer air intake port
160
, an exhaust port
161
, the condenser
122
, the fan
162
. The natural circulation refrigerating circuit
120
is constructed by connecting the condenser
122
in the condenser case
159
with the boiling type cooler
121
in the airflow path
167
via a refrigerant evaporation tube
123
and a liquid refrigerant return tube
124
so as to be shaped like a ring.
In the conventional cooling system, a cooling capability is determined in conformity with a maximum load of the heat components
105
. Because the casing
103
generally has a structure having an extremely small heat transfer through solid conductors, there are very small variations of a cooling load inside the casing
103
in response to variations of an outer air temperature.
In the next, an operation of the conventional system will be described. An air in the casing
103
is taken in the equipment case
106
through the air intake port
107
when a fan in the communication equipments
104
(not shown) is driven. A cooling air, taken in, cools the heat components
105
and is changed to be a heated air. Thereafter, the heated air is blown out of the exhaust port
108
in the back surface of the case into the heated air guide path
157
. Thus blown-
Isazawa Kenji
Nonaka Takashi
Seshimo Yu
Mitsubishi Denki & Kabushiki Kaisha
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Robinson Daniel
Walberg Teresa
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