KR20080105607A - Air conditioner and freeze protection method for communication equipment - Google Patents

Abstract

The present invention, the indoor and outdoor heat exchanger which is heat exchanged with the indoor and outdoor air of the base station, the circulation pipe for circulating the refrigerant by connecting the indoor and outdoor heat exchanger, the circulation pump installed on the circulation pipe, and the outdoor heat exchanger side Hot wire and refrigerant temperature sensor provided in the circulation pipe, a bypass pipe for circulating the refrigerant without passing through the outdoor heat exchanger, a bypass valve installed in the circulation pipe and the bypass pipe, and a first heat exchanger provided in the circulation pipe. First cooling means including a tube, a first brine heat exchanger surrounding the first heat exchange tube, and indoor and outdoor temperature sensors for measuring indoor and outdoor temperatures of the base station; A compressor for converting the refrigerant into a gas of high temperature / high pressure, a condenser for exchanging heat between the refrigerant passing through the compressor and outdoor air, an expansion valve for converting the refrigerant flowing from the condenser into a liquid of low temperature / low pressure, an expansion valve, And a second cooling means provided between the compressors and positioned in the first brine heat exchanger, the second cooling means including an evaporator for exchanging heat with the first tube for heat exchange, when the temperature of the coolant and / or the outdoor temperature falls below the reference temperature. The present invention provides a cooling device and a freezing prevention method for preventing freezing by stopping an operation of an outdoor unit or operating a heating wire.

Description

Air conditioner and freeze protection method for communication equipment {AIR CONDITIONING SYSTEM FOR COMMUNICATION EQUIPMENT AND METHOD FOR PREVENTING FROZEN}

1 is a schematic view showing a cooling device for a communication device according to the present invention.

2 is a view showing a cooling process using the first cooling means of the present invention.

3 is a view showing a cooling process using the first and second cooling means of the present invention.

4 is a view showing a cooling process using the first to third cooling means of the present invention.

5 and 6 is a flow chart illustrating a freeze protection method of a cooling device for communication equipment according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: first cooling means 110: indoor heat exchanger

112, 114: temperature sensor 120: outdoor heat exchanger

130: circulation piping 140: bypass piping

152, 154: bypass valve 162, 164: heat exchange tube

172, 174: brine heat exchanger 180: heating wire

190: refrigerant temperature sensor 200, 300: second and third cooling means

210, 310: compressor 220, 320: condenser

230, 330: expansion valve 240, 340: evaporator

400: base station 500: indoor unit

600: outdoor unit

The present invention relates to a cooling device for a communication device and a freezing prevention method. Specifically, when the coolant temperature and / or the outdoor temperature drops below a reference temperature, the cooling unit stops the operation of the outdoor unit or operates a heating wire to prevent freezing. It relates to a device and a freeze protection method.

A general air conditioner uses evaporative heat to take heat away from the surroundings when the refrigerant evaporates. As a refrigerant, a liquid such as ammonia, freon, azeotropic mixed refrigerant, chloromethyl, etc., which is easily evaporated even at low temperatures is generally used.

Such a conventional cooling device is a low-pressure sprayed refrigerant through expansion valves or capillaries after condensed into a high-pressure liquid refrigerant by heat exchange with the outside air while the refrigerant of the high-pressure compressed gas in the compressor passes through the condenser Is converted. The low pressure spray refrigerant is introduced into the evaporator, evaporated by heat exchange with the bet, and then flowed back into the compressor to circulate the cycle of the above-described process. It is blown to a predetermined space or object to be cooled by.

That is, such a general cooling device cools a predetermined space or object to be cooled by using a refrigerant which is easy to change phase such as liquefaction and evaporation. In particular, in the case of a communication base station or a communication vehicle, a plurality of wired and wireless communication equipments are installed therein, and these communication equipments can cause various malfunctions such as poor contact and equipment failure by frequent heat generation, thereby cooling four seasons all year round. Only in order to ensure the stability of the operation.

However, the conventional cooling device for communication equipment does not properly use the cool air of the natural state according to the external temperature, there is a drawback of a severe power waste by simply adopting a method driven by external power.

The present applicant has developed and applied a cooling device for a communication device and a control method (application number: 10-2005-0014790) that can cool the communication equipment by using the outside air to improve this problem. However, in the prior application, when the outdoor unit is operated for a long time, or when the outdoor temperature drops to below zero in winter, a problem occurs such that the refrigerant falls below the reference temperature and freezes. In this way, if freezing of the refrigerant continues, the pipes freeze and cooling of the communication equipment becomes impossible.

Accordingly, the present invention is to solve the above-mentioned problems, the cooling device and the freeze protection method for preventing freezing by stopping the operation of the outdoor unit or operating the heating wire when the temperature of the refrigerant or / and the outdoor temperature is lower than the reference temperature The purpose is to provide.

The present invention for achieving the object as described above relates to a device for cooling the communication equipment installed in the base station comprises a first cooling means, a second cooling means and a third cooling means.

The first cooling means may include an indoor and outdoor heat exchanger that exchanges heat with indoor and outdoor air of a base station, a circulation pipe for circulating refrigerant by connecting an indoor and outdoor heat exchanger, a circulation pump installed on the circulation pipe, and an outdoor space. The heating wire and the refrigerant temperature sensor provided in the heat exchanger side circulation pipe, the bypass pipe for circulating the refrigerant without passing through the outdoor heat exchanger, the bypass valves provided in the circulation pipe and the bypass pipe, respectively, A first heat exchange tube, a first brine heat exchanger surrounding the first heat exchange tube, and an indoor and outdoor temperature sensor for measuring indoor and outdoor temperatures of the base station.

In addition, the second cooling means includes a compressor for converting a refrigerant into a gas of high temperature / high pressure, a condenser in which heat exchange is performed between the refrigerant passing through the compressor and outdoor air, and a refrigerant introduced from the condenser into a liquid of low temperature / low pressure. And an evaporator provided between the expansion valve and the compressor and positioned in the first brine heat exchanger to exchange heat with the first heat exchange tube.

In addition, the third cooling means includes a compressor for converting a refrigerant into a gas of high temperature / high pressure, a condenser in which heat exchange is performed between the refrigerant passing through the compressor and outdoor air, and a refrigerant flowing from the condenser into a liquid of low temperature / low pressure. And an evaporator provided between the expansion valve, the expansion valve and the compressor and positioned in the second brine heat exchanger to exchange heat with the second heat exchange tube.

On the other hand, the freeze protection method of the cooling device for communication equipment according to the present invention, the first step of measuring the outdoor temperature of the base station, the second step of comparing the outdoor temperature with the first freezing temperature, the outdoor temperature is the first freezing wave If the temperature is lower than the third step, the indoor heat exchanger is operated, a pair of bypass valves are opened, and a freeze protection start for operating the circulation pump is performed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram schematically showing a cooling device for communication equipment according to the present invention.

As shown in FIG. 1, a cooling device for communication equipment according to the present invention includes a first cooling means 100 for directly cooling communication equipment (not shown), and a refrigerant charged in the first cooling means 100. It comprises a second cooling means 200 and the third cooling means 300 to indirectly cool by lowering the temperature of the. In this case, the first to third cooling means (100, 200, 300) is provided in the indoor unit 500 installed in the base station 400 and the outdoor unit 600 installed outside the base station 300 together with the communication equipment. . In addition, the indoor unit 500 and the outdoor unit 600 are provided with an indoor temperature sensor 510 and an outdoor temperature sensor 610 for measuring the indoor temperature and the outdoor temperature, respectively.

The first cooling means 100 of the first to third cooling means described above will be described first.

The indoor heat exchanger 110 provided inside the indoor unit 500 is a portion in which heat exchange is performed between the refrigerant and the indoor air, and first and second temperature sensors 112 and 114 are provided at the inlet and the outlet sides, respectively. One side thereof is provided with an indoor blower 116 for sending heat-exchanged air into the room. In addition, the outdoor heat exchanger 120 provided inside the outdoor unit 600 is a portion in which heat exchange is performed between the refrigerant and the outdoor air, and is provided at both sides of the outdoor blower 122 for discharging the heat-exchanged air to the outside. Each is installed but connected in series (or in parallel). The indoor heat exchanger 110 and the outdoor heat exchanger 120 are connected by the circulation pipe 130 and filled with a predetermined refrigerant therein.

The circulation pipe 130 is a portion in which the refrigerant is filled and circulated as described above, and the circulation pump 132 and the circulation pipe 130 for forcibly circulating the refrigerant on the circulation pipe 130 A pressure switch 134 and a flow rate switch 136 for measuring pressure and flow rate are provided. In addition, the outdoor heat exchanger 600 side circulation pipe 130 is provided with a heating wire 180 for preventing the freezing of the cooling device, and a refrigerant temperature sensor 190 for measuring the temperature of the refrigerant. In addition, on the circulation pipe 130, the first and second heat exchange tubes 162 and 164, which are heat-exchanged with the evaporators 240 and 340 of the second and third cooling means 200 and 300, which will be described later, are in series. The first and second brine heat exchangers 172 and 174 are provided to surround the first and second heat exchange tubes 162 and 164, respectively. On the other hand, the bypass pipe 140 is connected to the circulation pipe 130 so that the refrigerant can be circulated without passing through the outdoor heat exchanger 120, the circulation pipe 130 and the bypass pipe 140 to select them Alternatively, first and second bypass valves 152 and 154 for simultaneously opening and closing are provided.

Here, the circulation pump 132 is provided as a pair and connected in parallel with the pipe, even if any abnormality can be maintained in a stable cooling. In addition, the heating wire 180 is for preventing the freezing of the cooling device as described above.

The second cooling means 200 includes a compressor 210 for converting a refrigerant into a gas of high temperature / high pressure, a condenser 220 through which heat exchange is performed between the refrigerant passing through the compressor 210 and outdoor air, and the An expansion valve 230 for converting the refrigerant introduced from the condenser 220 into a liquid of low temperature / low pressure, and is provided between the expansion valve 230 and the compressor 210 and positioned in the first brine heat exchanger 172. The first heat exchange tube 162 and the evaporator 240 is a heat exchange is made.

In addition, the third cooling means 300 is the same configuration as the second cooling means 200, the compressor 310 for converting the refrigerant into a gas of high temperature / high pressure, and the refrigerant passing through the compressor 310 and the outdoor Between the condenser 320 and heat exchange between the air, the expansion valve 330 for converting the refrigerant introduced from the condenser 320 into a liquid of low temperature / low pressure, and between the expansion valve 330 and the compressor 310 And an evaporator 340 disposed in the second brine heat exchanger 174 to exchange heat with the second heat exchange tube 164.

Here, the first cooling means 100 of the cooling device for communication equipment according to the present invention uses water as a refrigerant, and the second and third cooling means 200 and 300 are freon, ammonia, chloromethyl and azeotropic mixed refrigerants. Is used as the refrigerant.

Looking at the cooling process of the communication equipment using the cooling device for communication equipment according to the present invention having the configuration as described above are as follows. At this time, the cooling mode of the communication equipment using the cooling device for communication equipment according to the present invention is determined by the room temperature, the outdoor heat exchanger 120 is operated or stopped according to the outdoor temperature and the refrigerant (also referred to as brine) temperature.

First, the indoor temperature of the base station 400 is measured, and if the measured indoor temperature is equal to or greater than the first reference temperature (for example, 25 ° C.), the first cooling means 100 is operated to perform primary cooling (see FIG. 2). ). At this time, when the outdoor temperature is lower than the refrigerant temperature, the first bypass valve 152 is opened and the outdoor heat exchanger 120 is operated (the second bypass valve 154 is closed). On the other hand, when the outdoor temperature is higher than the refrigerant temperature, the second bypass valve 154 is opened and the operation of the outdoor heat exchanger 120 is stopped (the first bypass valve 152 is closed).

In addition, when the measured indoor temperature is higher than the second reference temperature (for example, 26.5 ° C.) and the cooling in the base station is not sufficient by only the first cooling, the first cooling means 100 and the second cooling means 200 are operated together. Secondary cooling is performed (see FIG. 3). As described above, when the first and second cooling means 100 and 200 are operated together, the first refrigerant (the refrigerant of the first cooling means) and the second refrigerant (the refrigerant of the second cooling means) in the first brine heat exchanger 172. The heat exchange is performed between), and is cooled by using the cooled first refrigerant.

In addition, when the measured indoor temperature is higher than the third reference temperature (for example, 27.5 ° C.) and the cooling in the base station is not sufficient even by the second cooling, the first cooling means 100, the second cooling means 200, and the third cooling means. By operating all the cooling means 300 to perform the third cooling (see Fig. 4). As such, when all of the first to third cooling means 100, 200, and 300 are operated, heat exchange is performed between the first refrigerant and the second refrigerant in the first brine heat exchanger 162, and the second brine heat exchanger ( In 174, heat exchange is performed between the first refrigerant and the third refrigerant (the refrigerant of the third cooling means), and the air is cooled by using the cooled first refrigerant.

Here, even when the outdoor temperature is lower than the refrigerant temperature during the secondary and tertiary cooling as described above, the first bypass valve 152 is opened and the outdoor heat exchanger 120 is operated. The bypass valve 154 is opened and the operation of the outdoor heat exchanger 120 is stopped.

1, 5 and 6 with reference to the freeze protection method using a cooling device for communication equipment according to the present invention.

Referring to FIGS. 1 and 5, a method of preventing freezing in winter when the outdoor temperature is very low, first, measures the outdoor temperature T _out of the base station 400 using the outdoor temperature sensor 610 (S102). After comparing with the freezing temperature (T _f1 ) (S104), if the outdoor temperature (T _out ) is lower than the first freezing temperature (T _f1 , for example 5 ℃) (S106). In this case, the freeze protection start means that both of the pair of bypass valves 152 and 154 are opened while the outdoor blower 122 is stopped and the indoor heat exchanger 110 and the circulation pump 134 are started. Say. In addition, in such a state, when the outdoor temperature T _out rises above the second freezing temperature T _f2 (eg, 10 ° C.) (S108), the freezing prevention is stopped and normal cooling is performed (S110). The reason for stopping the freeze protection start as the second freezing temperature (T _f2 ) is that when the first freezing temperature (T _f1 ) is used, there is a risk of failure due to frequent on / off of the outdoor blower 122. .

The temperature T _flow of the refrigerant is measured using the refrigerant temperature sensor 190 (S112), and the measured temperature T _flow of the refrigerant is compared with a third freezing temperature (T _f3 , for example, 2 ° C.). (S114), when it is lower than the (T _f3 ) operates the heating wire 180 and the circulation pump 132 (S116). If it is cooled down, the outdoor blower is stopped. In addition, when the temperature T _flow of the refrigerant rises above the fourth freezing temperature T _f4 (eg, 5 ° C.) (S118), the operation of the heating wire is stopped and normal cooling is performed (S120).

Meanwhile, as illustrated in FIG. 6, when the outdoor temperature T _out measured by the outdoor temperature sensor 610 is less than or equal to the first set temperature (for example, −25 ° C.) (S202), the freeze protection start is performed every 15 minutes. If it exceeds 1st set temperature (-25 degreeC), and is below 2nd set temperature (for example -15 degreeC) (S206), it performs for 1 minute by a 30-minute cycle (S208). In addition, if the outdoor temperature T _out exceeds the second set temperature (-15 ° C.) and is less than or equal to the third set temperature (eg, −5 ° C.) (S210), it is performed for 1 minute in a 45 minute period (S212). If it exceeds 3 set temperature (-5 degreeC) and is below 4th set temperature (for example, 5 degreeC) (S214), it performs 1 minute by a 60-minute cycle (S216). Of course, when the outdoor temperature (T _out ) exceeds the fourth set temperature (5 ℃), the freeze protection start is stopped (S218).

In the present embodiment, it is illustrated that the freeze protection start is performed for 1 minute, but this is only an example, and it can be obvious that the operation can be performed below or above according to the needs of the user.

As described above, the configuration and control method of a cooling device for a communication device according to a preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is merely described for example and does not depart from the technical spirit of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the present invention.

As described above, the cooling device for a communication device and the control method thereof according to the present invention are freeze protection when the temperature of the coolant is lowered by using the cooling device continuously for a long time or when the coolant is easily frozen due to the low outdoor temperature such as in winter. To prevent freezing of the cooling system. In addition, the freeze protection start is automatically performed and periodically performed according to the temperature of the refrigerant and the outdoor temperature, and thus it is possible to prevent freezing of the cooling device regardless of the external environment.

Claims (10)

In the apparatus for cooling the communication equipment installed in the base station, Indoor and outdoor heat exchangers, each of which exchanges heat with indoor and outdoor air of the base station, a circulation pipe for circulating refrigerant by connecting indoor and outdoor heat exchangers, a circulation pump installed on the circulation pipe, and an outdoor heat exchanger side circulation pipe. A heating wire and a refrigerant temperature sensor to be used, a bypass pipe for circulating the refrigerant without passing through an outdoor heat exchanger, a bypass valve installed in the circulation pipe and the bypass pipe, and a first heat exchange tube provided in the circulation pipe; A first brine heat exchanger surrounding a first heat exchange tube, and first cooling means including an indoor and an outdoor temperature sensor for measuring indoor and outdoor temperatures of the base station; A compressor for converting the refrigerant into a gas of high temperature / high pressure, a condenser for exchanging heat between the refrigerant passing through the compressor and outdoor air, an expansion valve for converting the refrigerant flowing from the condenser into a liquid of low temperature / low pressure, an expansion valve, Second cooling means provided between the compressor and positioned in the first brine heat exchanger, the second cooling means including an evaporator for exchanging heat with the first heat exchange tube; Cooling device for communication equipment, characterized in that consisting of. The method of claim 1, The heating wire is a cooling device for communication equipment, characterized in that provided on the inlet or outlet side of the outdoor heat exchanger according to the capacity of the cooling device. The method of claim 2, A compressor for converting the refrigerant into a gas of high temperature / high pressure, a condenser for exchanging heat between the refrigerant passing through the compressor and outdoor air, an expansion valve for converting the refrigerant flowing from the condenser into a liquid of low temperature / low pressure, an expansion valve, It further comprises a third cooling means consisting of an evaporator provided between the compressor, The first cooling means further comprises a second heat exchange tube provided on an outlet side of the first heat exchange tube, and a second brine heat exchanger surrounding the evaporator of the second heat exchange tube and the second cooling means. Air conditioner for communication equipment. The method of claim 3, wherein Cooling device for communication equipment, characterized in that the refrigerant of the first cooling means is water. In the freezing prevention method of the cooling device for communication equipment according to claim 4, The first step of measuring the outdoor temperature of the base station, the second step of comparing the outdoor temperature to the first freezing temperature, and if the outdoor temperature is lower than the first freezing temperature, the indoor heat exchanger is operated and the pair of bypass valves A freezing prevention method of a cooling device for communication equipment, comprising: a third step of opening a freezing prevention start to operate a circulation pump. The method of claim 5, wherein And a fourth step of stopping the freeze protection start when the outdoor temperature rises above the second freeze temperature while the freeze protection start is performed. The method of claim 5, wherein And a fifth step of operating the hot wire and the circulating pump when the refrigerant temperature of the first cooling means is lower than the third freezing temperature. The method of claim 7, wherein And a sixth step of stopping the operation of the heating wire and the circulating pump when the refrigerant temperature rises above the fourth freezing temperature in a state in which the heating wire is operated. The method according to any one of claims 5 to 8, The freeze protection start is performed for 1 minute every 15 minutes when the outdoor temperature is less than the first set temperature, 1 minute every 30 minutes when the first set temperature is exceeded and less than the second set temperature, and exceeds the second set temperature. If the temperature is less than the third set temperature for 1 minute every 45 minutes, and if the temperature exceeds the third set temperature and less than the fourth set temperature for 1 minute every 60 minutes, freezing prevention method for a cooling device for communication equipment. The method according to any one of claims 5 to 8, The freezing prevention method of the cooling device for communication equipment, characterized in that the operation of the outdoor blower provided in the outdoor heat exchanger is stopped when the freeze prevention operation.

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