JP2015005677A - Electronic device device and casing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device apparatus that can be installed under high temperature, high humidity environmental conditions, and that accommodates in it an electronic device, which is a heat generating object, and to provide a housing for the apparatus.SOLUTION: An electronic device apparatus comprises: a rack cabinet 1 accommodating an electronic device 7, which is a heat generating object; a front door 2 and a rear door 3; a first vaporizer 11a provided inside the front door; a second vaporizer 11b provided inside the rear door; a control section 200 by which air circulating in the electronic device is cooled in the first and second vaporizers by heat exchange, and the first and second refrigeration cycles Ra, Rb are controlled so that the cooled air is circulated in the first vaporizer, the electronic device, and the second vaporizer; and a detecting section 17 that detects opening/closing of the door. The control section controls the first and second refrigeration cycles based on an output resulting from the detection of the opening/closing of the door, such that the coolant evaporation temperature of the second vaporizer is not higher than that of the first vaporizer.

Description

  The present invention relates to an electronic device apparatus that houses an electronic device that is a heating element such as a server device, and cools the electronic device by a circulating air flow, and a casing thereof.

  As a background art in this technical field, there is an electronic apparatus device described in Japanese Patent Application Laid-Open No. 2007-324514 (Patent Document 1).

  The electronic device device of Patent Document 1 has a control device that controls the operation of the compressor and the valve opening degree of the expansion valve based on the air temperature of the storage chamber that stores the server that is a heating element. Then, the control device executes an evaporation temperature control mode for controlling the valve opening degree of the expansion valve so that the evaporation temperature becomes a predetermined condensation avoidance temperature capable of avoiding condensation on the server based on the evaporation temperature of the refrigerant in the evaporator. At the same time, when the degree of heating of the refrigerant in the evaporator falls below a predetermined liquid return risk value, the degree of heating control for controlling the opening degree of the expansion valve so that the degree of heating of the refrigerant becomes a predetermined liquid return avoidance value Switch to the mode and execute the heating degree control mode.

JP 2007-324514

  In relatively small offices such as small and medium-sized enterprises and local governments, servers, storage devices are installed in warehouses, vacant rooms, corners of offices, etc. without newly creating a computer room, data center, etc. In some cases, electronic devices that are heating elements such as network devices are housed. For this reason, when there is no air conditioning equipment or when air conditioning is stopped at night when there are no people, the surroundings become hot due to the electronic equipment that is a heating element, exposing the electronic equipment to an environment that exceeds the guaranteed operating range. There is a possibility that it may cause a decrease in service life or a failure.

  Therefore, there is a sealed rack cabinet in order to allow the electronic device as the heating element to be installed even under adverse environmental conditions. However, even in this sealed rack cabinet (electronic device apparatus), the electronic equipment such as a server to be stored generally requires regular maintenance. When opening and closing, high temperature and humid outside air is taken in.

  The electronic device apparatus described in Patent Document 1 is also a sealed rack cabinet. However, since the ambient air is taken into the interior by opening and closing the door during maintenance, the system that controls the evaporation temperature based on a predetermined dew condensation avoiding temperature, when high temperature and high humidity air is taken in, the server stored inside In some cases, condensation on electronic devices cannot be avoided. For this reason, the environment in which the electronic device is installed may be limited.

  An object of the present invention is to provide an electronic device apparatus that can be installed even under high-temperature and humid environmental conditions, and a casing thereof.

  In order to solve the above-described problems, the present invention provides a rack cabinet having a storage unit that stores an electronic device that is a heating element, a front door and a rear door that are attached to the rack cabinet so as to sandwich the storage unit, and a front surface. A first evaporator provided in the door and forming a first refrigeration cycle; a second evaporator provided in the rear door and forming a second refrigeration cycle; The first and second evaporators are cooled by heat exchange, and the cooled air is circulated from the first evaporator, the storage unit, and the second evaporator to the first evaporator. A control unit for controlling the refrigeration cycle of 2 and a detection unit for detecting opening / closing of the door, and the control unit determines the refrigerant evaporation temperature of the second evaporator based on the door opening / closing detection output by the detection unit. The first and the second so as to be below the refrigerant evaporation temperature of the evaporator. A second refrigeration cycle and configured to control a predetermined time.

  According to the present invention, it is possible to provide an installable electronic device apparatus and a casing thereof even under high temperature and humid environmental conditions.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is an external perspective view of an electronic device according to a first embodiment of the present invention. It is sectional drawing of the electronic device apparatus of 1st Example of this invention. It is an expanded sectional view of a back side door. It is a block diagram of a control system in a cooling mode. It is a flowchart explaining the operation | movement in cooling mode. It is a block diagram of a control system in the dehumidifying mode. It is a flowchart explaining the operation | movement in dehumidification mode. It is an air line figure for calculating dew condensation temperature. It is sectional drawing of the electronic device apparatus of 2nd Example of this invention. It is a block diagram of the control system which detects opening and closing of a door.

  An electronic device apparatus according to an embodiment of the present invention is opposed to a rack cabinet including a storage unit that stores an electronic device that is a heating element such as a server, a storage device, and a network device, and a storage unit that stores the electronic device. A front door and a rear door attached to the rack cabinet, a first evaporator provided in the front door and forming a first refrigeration cycle, and a second evaporator provided in the rear door and forming a second refrigeration cycle. 2 evaporators. And the air which flows (passes) the storage part which stores the electronic device which is heat generating bodies, such as the said server, was cooled by heat exchange with the 1st evaporator and the 2nd evaporator, and was cooled. Air is sequentially circulated from the first evaporator, the storage unit, and the second evaporator to the first evaporator, thereby cooling electronic devices such as servers stored in the storage unit. Each of the first and second refrigeration cycles includes a compressor, a condenser, an expansion valve, and the evaporator, and these are connected by a pipe through which a refrigerant flows to form a closed loop. The electronic device apparatus includes a control unit that controls the rotation speed of the compressor and the valve opening of the expansion valve, and a detection unit that detects opening and closing of the front door and the rear door. When the opening / closing of the rear door is detected, the control unit detects the refrigerant evaporation temperature of the second evaporator provided in the rear door based on the door opening / closing detection output of the first evaporator provided in the front door. The first refrigeration cycle and the second refrigeration cycle are controlled for a predetermined time so as to be equal to or lower than the refrigerant evaporation temperature. That is, when the outside air is introduced from the surrounding environment (external environment) where the electronic device is installed into the storage unit in which the electronic device such as the server is stored by opening / closing the front door or the rear door, the control unit And the opening degree of the expansion valve are adjusted, and the dehumidifying operation is performed for a predetermined time by the first refrigeration cycle and the second refrigeration cycle.

  As a result, even if the electronic device is installed in a place under high-temperature and high-humidity external environmental conditions, the high-temperature and high-humidity outside air introduced from the outside is the second on the back side where the refrigerant evaporation temperature is low. The evaporator and the first evaporator having a high refrigerant evaporation temperature are cooled and dehumidified by heat exchange, so that condensation can be prevented from occurring in electronic devices such as servers.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is an external perspective view of an electronic apparatus device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the electronic device according to the first embodiment of the present invention. In FIG. 2, the solid arrow indicates the air flow circulating in the storage unit 5, the white arrow indicates the air flow passing through the radiator unit 6, and the dotted line indicates the signal line of the control unit 200. FIG. 3 is an enlarged cross-sectional view of the rear side door. FIG. 1 shows a state in which the front door 2 and the back door 3 are opened. The housing of the electronic device apparatus 100 includes a rack cabinet 1, a front side door 2, and a back side door 3. The front door 2 contains an evaporator 11a (first evaporator) and a fan 12a, and the rear door 3 contains an evaporator 11b (second evaporator) and a fan 12b. 11a and 11b can exchange heat with the air circulating in the housing. Further, the front door 2 and the back door 3 are provided with openings 15. The rack cabinet 1 is provided with a radiator unit 6, a server storage unit 5, and a compressor chamber 14. A duct 4 is provided above and below in the storage unit 5, and a server 7 is mounted as an electronic device that is a heating element in other spaces. In the following, a server will be described as an example of an electronic device that is a heating element. However, the present invention is not limited to this, and storage devices, network devices, and the like are also included in the electronic device that is a heating element. In addition, although the plurality of servers 7 are stacked here, they may be disposed alone in a part of the storage unit 5. Each server 7 is provided with a blower 16, and the internal heat generating components can be cooled by allowing ambient air to flow therethrough. When the front door 2 and the rear door 3 are closed, the duct 4 is provided in the front door 2 and the flow path 2a in which the evaporator 11a is disposed, and in the rear door 3 and the evaporator 11b is disposed. The flow path 3a is connected.

  The radiator unit 6 is provided with a condenser 9a and a condenser 9b, and the compressor chamber 14 is provided with a compressor 8a, a compressor 8b, an expansion valve 10a, and an expansion valve 10b. The compressor 8a, the condenser 9a, and the expansion valve 10a are sequentially connected by piping, and the compressor 8b, the condenser 9b, and the expansion valve 10b are sequentially connected by piping. The compressor 8a, the condenser 9a, and the expansion valve 10a are connected to the evaporator 11a built in the front door 2 by a copper pipe to form a closed loop and form a first refrigeration cycle Ra. The compressor 8b, the condenser 9b, and the expansion valve 10b are connected to the evaporator 11b built in the rear door 3 by a copper pipe to form a closed loop, thereby forming a second refrigeration cycle Rb. The refrigeration cycle of the present embodiment is composed of two refrigeration cycles consisting of a first refrigeration cycle Ra and a second refrigeration cycle Rb, and hereinafter includes a first evaporator 11a provided on the front door 2. One refrigeration cycle Ra is referred to as a front-side cycle Ra, and a second refrigeration cycle Rb including an evaporator 11b provided in the back-side door 3 is referred to as a back-side cycle Rb. In the present specification, the expansion valve may be referred to as a pressure reducing device.

  Sensors 17a and 17b for detecting opening and closing of the door are provided on the contact surface between the cabinet 1 and the front door 2 and the contact surface between the cabinet 1 and the rear door 3, respectively. Sensors 17a and 17b that detect the opening and closing of the door are door switches that detect the opening and closing of the door by detecting magnetism. The door switch may use an optical sensor that detects the opening and closing of the door by detecting light. As shown in FIG. 3, a drain pan 18 is provided at the lower part of the evaporator 11b, the bottom plate of the drain pan 18 is inclined, and a moisture detection sensor 19 is disposed in the recess of the bottom plate. The moisture detection sensor 19 is covered with a cover in order to detect only moisture at the bottom of the drain pan 18. Furthermore, a flexible tube is used for a part of piping connecting the evaporators 11a and 11b and the expansion valves 10a and 10b and a part of piping connecting the evaporators 11a and 11b and the compressors 8a and 8b.

  In this embodiment, the compressor 8a, the condenser 9a, the expansion valve 10a, and the evaporator 11 that constitute the front-side cycle, and the compressor 8b, the condenser 9b, the expansion valve 10b, and the evaporator 11b that constitute the rear-side cycle, Uses a common product with the same performance. As a result, manufacturing costs can be reduced, and control software can be easily created. Further, even when parts need to be replaced due to a failure or the like, mistakes can be prevented.

  The compressor 8 is a variable capacity compressor capable of capacity control. As such a compressor, a piston type, a rotary type, a scroll type, a screw type, or a centrifugal type can be adopted. Specifically, the compressor 8 is a scroll type compressor, capacity control is possible by inverter control, and the rotational speed is variable from low speed to high speed. This refrigeration cycle is filled with R410A refrigerant. For example, HFO1234yf or R134a can be used instead of the R410A refrigerant. The radiator unit 6 is provided with a blower 18 so that heat can be exchanged between the outside air flowing in from the openings provided in the upper portions of the front door 2 and the rear door 3 and the condenser 9.

  In addition, the electronic device 100 includes a sensor 20 that detects a server inlet temperature (an inlet temperature to the storage unit 5) and a sensor 25 that detects an outside temperature as sensors that detect the air temperature. Further, as sensors for detecting the refrigerant temperature, the front-side cycle Ra includes a sensor 23a for detecting the refrigerant inlet temperature of the refrigerant, a sensor 24a for detecting the compressor suction temperature (refrigerant outlet temperature of the refrigerant), and a rear surface. The side cycle Rb is provided with a sensor 23b for detecting the refrigerant inlet temperature of the refrigerant and a sensor 24b for detecting the compressor suction temperature (refrigerant outlet temperature of the refrigerant). The electronic device 100 according to the present embodiment is based on the temperatures detected by the sensors that detect the air temperature and the sensors that detect the refrigerant temperature, and the rotation speeds of the compressors 8a and 8b and the expansion valves 10a and 10b. A control unit 200 for adjusting the opening degree is provided. Here, the control unit 200 is configured by a memory such as a CPU, a ROM, and a RAM (not shown), reads a program stored in the memory, and executes various processes. The control unit 200 outputs valve openings of expansion valves 10a and 10b, which will be described later, and the rotational speeds of the compressors 8a and 8b as control signals.

  Next, the flow of the refrigerant will be described. Since the refrigerant flow in the front-side cycle Ra and the refrigerant flow in the rear-side cycle Rb are the same, the following description will be made without distinguishing both. In this case, the code shall not be suffixed with a or b. The refrigerant, which has been pressurized by the compressor 8 and becomes a high-temperature / high-pressure gas, dissipates heat to the outside air in the process of passing through the condenser 9, and changes from a gas to a two-phase state to a liquid. Thereafter, the refrigerant that has passed through the expansion valve 10 and has been reduced in pressure to become a low-pressure two-phase state absorbs heat from the air in the server housing 5 in the process of passing through the evaporator 11, and again changes from the two-phase state to the gas. The phase changes and is returned to the compressor 8.

  Next, the flow of air circulating in the electronic apparatus device 100 will be described. The air around the server 7 is taken into the server 7 by the blower 16 built in the server 7, and becomes high temperature due to exhaust heat of the heat generating electronic components. After passing through the server 7, it passes through the evaporator 11b by a fan 12b built in the back side door 3, where it is cooled for the first time. After that, the air that has moved to the duct 4 passes through the evaporator 11a by the fan 12a built in the front door 2, is cooled for the second time, and is discharged to the suction side of the server 7. That is, the air cooled by the first evaporator 11a flows through the storage unit 5 that stores the electronic device (server 7), and is warmed by cooling the electronic device. The warmed air is cooled by the second evaporator 11b and then returned to the first evaporator 11a. As described above, the air in the casing flows through the first evaporator 11a, the storage unit 5 that stores the electronic device, and the second evaporator 11b, and forms a circulating flow that circulates back to the first evaporator 11a. To do.

  As described above, since the electronic device 100 according to the present embodiment cools the server 7 with the air circulating in the sealed space, the humidity in the server storage space is once changed to the air cooled by the first evaporator 11a. If it is confirmed that the humidity is equal to or lower than the dew point, no condensation occurs on the server 7 unless the air in the server housing 5 is replaced. In other words, by determining the humidity when the front door 2 or the rear door 3 that causes air exchange in the server storage unit 5 is opened and closed, damage to the server due to condensation can be prevented. In the present embodiment, opening / closing of the front door 2 or the back door 3 is detected, and control for switching between a normal cooling mode and a dehumidifying mode is performed.

  As described above, the electronic device 100 according to the present embodiment has a structure in which the air circulating in the storage unit 5 is cooled by the evaporator 11a.11b and the exhaust heat of the server is radiated from the condensers 9a and 9b. In addition, it is not necessary to provide a separate cooling facility in the place where the electronic apparatus device 100 is installed, that is, in the room. As shown in FIG. 1, the exhaust heat released from the condensers 9 a and 9 b may be released to the outside by the ventilation fan 103 through the duct 102. In contrast, existing data centers use a system that cools the server with ambient air and dissipates the exhaust heat of the server to the ambient air. Therefore, a separate cooling device that cools the ambient air to a temperature suitable for server cooling is separately provided. It is necessary to provide it. In this case, it is necessary to introduce ancillary equipment such as a cooling air outlet on the floor surface 104 shown in FIG. 1 or an exhaust heat inlet on the ceiling portion 101. It was something that required a period.

  Next, the processing operation in the cooling mode and the treatment operation in the dehumidifying mode by the control unit 200 will be described.

  FIG. 4 is a block diagram of the control system in the cooling mode. The control system of the electronic device 100 includes a control unit 200, a sensor 20 that detects a server inlet temperature, a sensor 25 that detects an outside temperature, and temperature sensors 23a and 23b that detect a refrigerant temperature at an evaporator inlet, Temperature sensors 24a and 24b for detecting the refrigerant temperature on the suction side of the compressor (refrigerant temperature at the outlet of the evaporator). In the following description, the temperature measured by each sensor is described with the same reference numerals as the sensor. The server intake air temperature 20 is the temperature of the air flowing into the storage unit 5 to cool the server 7 which is an electronic device, and the temperature of the air cooled by the evaporator 11a (the outlet air temperature of the evaporator 11a) 20 It is.

  The control unit 200 takes in temperature data measured by each of the temperature sensors. The evaporator inlet temperature sensor 23a and the evaporator outlet (compressor suction) temperature sensor 24a are provided in the front-side cycle Ra. The evaporator inlet temperature sensor 23b and the compressor suction temperature sensor 24b are provided in the rear side cycle Rb.

  In this specification, an example will be described in which the air circulating in the housing is cooled based on a preset target value of the server inlet temperature. For this reason, regardless of the room temperature of the room in which the electronic device apparatus 100 is installed, the electronic device that is a heating element such as the server 7 disposed in the electronic device apparatus 100 can be cooled with cooling air having a desired temperature.

  The control system of the electronic device 100 uses the temperature measured by each temperature sensor and the target server intake air temperature, and according to the control flow described later, the opening degree of the expansion valves 10a and 10b and the rotational speed of the compressors 8a and 8b. And control. The compressors 8a and 8b are variable speed type compressors driven by an inverter. The expansion valve 10a and the compressor 8a are provided in the front side cycle Ra (first refrigeration cycle), and the expansion valve 10b and the compressor 8b are provided in the back side cycle Rb (second refrigeration cycle). Yes.

FIG. 5 is a flowchart for explaining the operation in the cooling mode. When the electronic device 100 is turned on, the control unit 200 reads out the target server intake air temperature set by the user from a memory (not shown) in the control unit 200, and the server input measured by the sensor 20 and the sensor 25. Air temperature and outside air temperature are acquired (step S101). Next, the rotational speeds of the two compressors 8a and 8b and the opening degrees of the expansion valves 10a and 10b are obtained by calculation based on the acquired target server intake air temperature (step S102). The operation control of the compressors 8a, 8b and the expansion valves 10a, 10b is started at the degree (step S103). Thereafter, the degree of superheat of the rear side cycle Rb (compressor suction temperature 24b−evaporator inlet temperature 23b) is calculated, and it is determined whether or not the obtained rear side superheat degree matches the target value (step S104). If not, the opening degree of the back side expansion valve 10b is adjusted, and the process returns to step S104 (step S107). When the coincidence determination is made in step S104, the superheat degree of the front side cycle Ra (compressor suction temperature 24a-evaporator inlet temperature 23a) is calculated, and it is determined whether the obtained front side superheat degree matches the target value ( Step S105). If not, the opening degree of the front side expansion valve 10a is adjusted, and the process returns to step S104 (step S108). Here, the target values in step S104 and step S105 are set such that the refrigerant temperature 23a at the evaporator inlet of the front-side cycle Ra is equal to or lower than the refrigerant temperature 23b at the evaporator inlet of the rear-side cycle Rb. If coincidence is determined in step S105, it is determined whether the server intake air temperature matches the target value (step S106). If not, the rotational speeds of the compressor 8a in the front-side cycle Ra and the compressor 8b in the rear-side cycle Rb are adjusted, and the process returns to step S104. If a match is determined in step S106, the operation is continued. In this embodiment, the amount of adjustment of the rotational speed of the compressor 8a of the front-side cycle Ra and the compressor 8b of the front-side cycle Rb is the same rotational speed. Further, the target value that is the target of the coincidence determination may be set as a value within a predetermined range.
Next, the dehumidifying mode will be described. FIG. 6 is a control system block diagram in the dehumidifying mode. The description of the same blocks as those in the cooling mode of FIG. 4 is simplified. The control system of the electronic device 100 includes a control unit 200, a temperature sensor 20 that detects the server inlet temperature, a temperature sensor 25 that detects the outside temperature, temperature sensors 23a and 23b that detect the refrigerant temperature at the evaporator inlet, And a temperature sensor 24a for detecting the refrigerant temperature at the outlet of the side evaporator.

  The control system of the electronic device 100 uses a temperature detected by each temperature sensor, a target server inlet temperature and a target server humidity, and a dew temperature calculated based on the target server inlet temperature and the target server humidity, as described later. According to the flow, the opening degree of the expansion valves 10a and 10b and the rotational speed of the compressors 8a and 8b are controlled.

FIG. 7 is a flowchart for explaining the operation in the dehumidifying mode. When opening / closing of the front door 2 or the rear door 3 is detected by the sensors 17a and 17b, the control unit 200 switches the control of the electronic device 100 from the cooling mode to the dehumidifying mode. The control unit 200 reads out the target server inlet temperature and target server humidity set by the user in advance from a memory (not shown) in the control unit 200, and obtains the server inlet temperature and the outside temperature measured by the sensors 20 and 25. (Step S201). Based on the acquired target server inlet temperature and target server humidity, the condensation temperature, the number of revolutions of the two compressors 8a and 8b, and the opening degree of the expansion valves 10a and 10b are obtained by calculation (step S202), and the obtained number of revolutions Then, the operation control of the compressors 8a and 8b and the expansion valves 10a and 10b is started based on the opening degree (step S203). Here, the dew condensation temperature is a dew point temperature calculated based on the target server humidity and the target server intake air temperature assumed by the user. This dew condensation temperature is obtained from an air diagram described below. FIG. 8 is an air diagram for calculating the dew condensation temperature. FIG. 8 shows a simplified air diagram, and the control unit 200 stores the air diagram in advance in a memory (not shown). For example, when the target server inlet temperature is 25 ° C. and the target server humidity is 30%, the control unit 200 uses the dew point temperature when the absolute humidity is 30%, the relative temperature is 25 ° C., and the saturation is 100%. Some condensation temperature is 6.2 ℃.
Thereafter, it is determined whether or not the evaporation temperature (refrigerant inlet temperature of the refrigerant) of the rear side cycle Rb matches the above dew condensation temperature (step S204). If not, the opening degree of the rear side expansion valve 10b is adjusted and the process proceeds to step S204. Return (step S207). If coincidence determination is made, it is determined whether the superheat degree (compressor suction temperature 24a-evaporator inlet temperature 23a) of the front-side cycle Ra matches the target value (step S205). If not, the opening degree of the front side expansion valve 10a is adjusted, and the process returns to step S204. Here, the target values in step S204 and step S205 are set such that the refrigerant temperature 23b at the evaporator inlet of the rear side cycle Rb is equal to or lower than the refrigerant temperature 23a at the evaporator inlet of the front side cycle Ra. If a match is determined in step S205, it is determined whether the server intake air temperature matches the target value (step S206). If not, the rotational speeds of the compressor 8a in the front-side cycle Ra and the compressor 8b in the rear-side cycle Rb are adjusted, and the process returns to step S204. If a match is determined in step S206, the operation is continued for a predetermined time. Here, the predetermined time is a dehumidifying operation time determined by the volume of the storage unit 5 or the flow rate of the circulating air, and is 120 seconds as an example in this embodiment. After 120 seconds, switch to the cooling mode described above. In the present embodiment, the amount of adjustment of the rotational speed of the compressor 8a in the front-side cycle Ra and the compressor 8b in the front-side cycle Rb is set to the same rotational speed as in the above-described cooling mode. Further, the target value that is the target of the coincidence determination may be set as a value within a predetermined range.

  In the above dehumidifying mode, the moisture detection sensor 19 detects the liquid level of the drain pan 18 provided in the lower part of the evaporator 11b, that is, detects the amount of water in the drain pan 18, and the amount of water in the drain pan 18 is equal to or greater than a predetermined amount. It is configured to issue an alarm such as an alarm sound.

  According to the present embodiment, the effects described below can be obtained.

  In the dehumidification mode, the air in the storage unit 5 is cooled to the dew condensation temperature for a certain period of time with the evaporator 11b in the rear side cycle Rb.If the air in the storage unit 5 is higher than the target humidity, the dew condensation is performed in the evaporator 11b. Then, moisture is accumulated in the drain pan 18. Since the drain pan 18 accumulates a certain amount or more of moisture and the moisture detection sensor 19 detects moisture, an alarm is generated, so that there is no inconvenience of condensation on the server 7 during the dehumidifying mode.

  In addition, the electronic device apparatus 100 according to the present embodiment can efficiently cool the air in the storage unit 5 by switching to the cooling mode after the dehumidifying mode. That is, by performing cooling in two stages of the evaporator 11b in the rear side cycle Rb and the evaporator 11a in the front side cycle Ra, the air circulating in the cabinet becomes the lowest temperature immediately before the server 7 as a heating element. . For this reason, there is little leakage of heat to the surrounding air, and it is possible to reduce the input of the compressor and efficiently cool the server 7 as compared with the case where cool air is generated in the lower stage disclosed in the prior art. It is possible to significantly reduce power consumption.

  In addition, the electronic device 100 of the present embodiment is provided with the evaporator 11a on the front door 2 and the evaporator 11b on the rear door 3 so as to sandwich the storage 5 that stores the server 7 that is a heating element. In addition, the fans 12a and 12b provided in the evaporators 11a and 11b suck the exhaust heat on the surface of the evaporator 11b of the rear side cycle Rb and blow out cold air on the surface of the evaporator 11a of the front side cycle Ra. ing. As a result, the server 7, which is a heating element, is cooled by the air circulating in the sealed space of the storage unit 5 and the duct 4, so that there is no possibility of taking in dust and moisture at the same time regardless of the installation location. . In addition, even when a plurality of servers 7 are stacked and stored in the storage unit 5, it is possible to cool uniformly without causing temperature distribution in the lower layer and the upper layer, so that the upper layer server can also sufficiently dissipate heat. Thus, the reliability of the electronic device can be ensured.

  In addition, the electronic device apparatus 100 according to the present embodiment has inverter compressors 8a and 8b mounted on the rear side cycle Rb and the front side cycle Ra. As a result, even when the amount of change in the heat generation amount becomes large, it becomes possible to perform an operation that suppresses overcooling and undercooling by following the change amount. The number of servers 7 that can be installed in the server can be increased.

  In general, an electronic device that is a heating element such as the server 7 is regularly maintained for maintenance and inspection, and the front door 2 or the rear door 3 is opened at that time. Since the electronic device device 100 described in the present embodiment uses a part of the pipe connecting the evaporator 11 and the expansion valve 10 and a part of the pipe connecting the evaporator 11 and the compressor 8 as a flexible pipe, Even when the door is opened, it can be operated continuously, and there is no inconvenience that the operation of the apparatus is stopped at every maintenance.

  As described above, the electronic device 100 according to the present embodiment has a large maximum heat generation amount in the storage unit 5 where the surrounding environment in which the electronic device device 100 is installed is a high temperature and high humidity environment or a plurality of servers 7 are stacked. Even in this case, it is possible to provide a highly energy-saving and highly reliable electronic device cooling apparatus capable of uniformly cooling the inside of the storage unit 5 and preventing condensation in the housing.

  FIG. 9 is a cross-sectional block diagram of an electronic apparatus device according to a second embodiment of the present invention. FIG. 10 is a block diagram of a control system for detecting opening and closing of the door. In FIG. 9, solid arrows indicate the flow of air circulating in the storage unit 5, and white arrows indicate the flow of air passing through the radiator 6. In the electronic apparatus device of FIG. 9, the same components as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted. A difference from the first embodiment is that a radiator unit 6 is arranged at the lower part of the rack cabinet 1, and a condenser and a compressor are shared in the first refrigeration cycle and the second refrigeration cycle, and these are provided in the radiator unit 6. There is.

  The casing of the electronic device according to the present embodiment includes a rack cabinet 1, a front door 2, and a back door 3. The front door 2 includes an evaporator 11a and a fan 12a, and the rear door 3 includes an evaporator 11b and a fan 12b. The evaporators 11a and 11b can exchange heat with the air circulating in the housing. It has become. The rack cabinet 1 is provided with a radiator unit 6, a server storage unit 5, and a duct 4. In the storage unit 5, a server 7 is mounted as an electronic device that is a heating element. In the following, a server will be described as an example of an electronic device that is a heating element. However, the present invention is not limited to this, and storage devices, network devices, and the like are also included in the electronic device that is a heating element.

  The radiator unit 6 is provided with one compressor 8 ', one condenser 9, two branch portions 16a and 16b, and two expansion valves 10a and 10b. Between the branch part 16a and the branch part 16b, an evaporator 11a built in the front door 2 and an evaporator 11b built in the back door 3 are connected in parallel, and two refrigeration cycles Ra ′ and Rb ′ are connected. Is formed.

  The first refrigeration cycle (front-side cycle) Ra ′ is a cycle in which the refrigerant returns from the compressor 8 ′ to the compressor 8 ′ via the condenser 9 ′, the branch portion 16a, the expansion valve 10a, the evaporator 11a, and the branch portion 16b. Consists of. In the second refrigeration cycle (rear side cycle) Rb ′, the refrigerant passes from the compressor 8 ′ to the compressor 9 ′ via the condenser 9 ′, the branch portion 16b, the expansion valve 10b, the evaporator 11b, and the branch portion 16b. Composed by a return cycle. In this embodiment, two refrigeration cycles of the front side cycle Ra ′ and the back side cycle Rb ′ are configured, but the compressor 8 ′ (including the inverter) and the condenser 9 are used in two refrigeration cycles. Is done. Although the control unit 200 is omitted in FIG. 9, the control unit 200 is disposed in the radiator unit 6 and is connected to the compressor 8 ′ and the expansion valves 10a and 10b through signal lines to rotate the compressor 8 ′. The number and the opening of the expansion valves 10a, 10b are controlled.

  In addition to the sensor described in the first embodiment, the electronic device apparatus includes an exhaust temperature sensor 21 as a sensor for detecting the air temperature. In this embodiment, the opening / closing detection of the door of the electronic device is determined based on the temperature and amount of change of the server intake air temperature sensor 20, the exhaust gas temperature sensor 21, the duct internal temperature sensor 22, and the outside air temperature sensor 25.

  Next, the flow of the refrigerant will be described. The refrigerant, which has been pressurized by the compressor 8 'and turned into a high-temperature and high-pressure gas, radiates heat to the outside air in the process of passing through the condenser 9', and changes phase from gas to two-phase state and liquid. Thereafter, the branching portion 16a branches into two flow paths. One flow path passes through the expansion valve 10a and the other flow path passes through the expansion valve 10b, and the pressure is reduced. As a result, the refrigerant that has become a low-pressure two-phase state absorbs heat from the air in the server storage chamber 5 in the process of passing through the evaporator 11a or the evaporator 11b, and again changes in phase from the two-phase state to the gas. In 16b, it becomes one flow path and is returned to the compressor 8 '.

  Next, the cooling mode will be described. Also in the present embodiment, as in the first embodiment, the superheat degree of the rear side cycle Rb ′ becomes the inlet / outlet temperature difference of the evaporator 11b, and the superheat degree of the front side cycle Ra ′ becomes the inlet / outlet temperature difference of the evaporator 11a. The expansion valve 10a of the front side cycle Ra ′ is an expansion valve 10a connected to the evaporator 11a as in the first embodiment, and the expansion valve 10b of the rear side cycle Rb ′ is connected to the evaporator 11b as in the first embodiment. The expansion valve 10a has the same sign. However, since there is one compressor for the two refrigeration cycles, when the server intake air temperature deviates from the target value, only the rotational speed of the compressor 8 'is adjusted.

  The control system for detecting the opening / closing of the door of the electronic device apparatus shown in FIG. 10 includes a control unit 200, a sensor 20 for detecting the server intake temperature, and a sensor 21 for detecting the exhaust temperature from the server 7 as a heating element. And a sensor 22 for detecting the temperature in the duct 4 and a sensor for detecting the outside air temperature.

  Next, the dehumidifying mode will be described. When the front side door 2 is opened, the server inlet temperature 20 and the duct internal temperature 22 show values close to the outside air temperature 25, and at the same time, the superheat degree of the front side cycle Ra 'changes. When the front door 2 is closed, there is a temperature difference between the server inlet temperature 20 and the duct internal temperature 22. Similarly, when the back side door 3 is opened, the server exhaust temperature 21 and the duct internal temperature 22 show values close to the outside air, and at the same time, the degree of superheat of the back side cycle Rb 'changes. Further, when the rear side door 3 is closed, a temperature difference occurs between the exhaust temperature 21 and the duct internal temperature 22. As described above, the control unit 200 can detect the opening / closing of the front door 2 and the back door 3 by detecting the change amount of the sensor. After detecting the opening and closing of the door, the process proceeds to the dehumidifying mode. The control in the dehumidifying mode is the same as in the first embodiment.

  Since the electronic device cooling apparatus of the present embodiment includes a single compressor and a condenser, in addition to the effects described in the first embodiment, the manufacturing cost can be suppressed. Further, since a temperature sensor is used as a sensor for detecting the opening / closing of the door, instead of a door switch for detecting magnetism, an external impact due to the opening / closing of the door is difficult to be applied, and it is difficult to break down. For this reason, even when used for a long period of time, the opening and closing of the door can be reliably detected, and a decrease in reliability due to a detection error can be suppressed.

  In the present embodiment, the example in which the condenser 9 ′ is disposed in the radiator unit 6 provided in the lower part of the rack cabinet 1 has been described. However, the present invention is not limited to this. For example, two condensers are used as in the first embodiment. The units 9a and 9b are arranged in a unit provided at the top of the rack cabinet 1, the compressor in the compressor chamber 14 is shared by one compressor 8 ', and the branch portions 16a and 16b are in the compressor chamber 14. It is good also as a structure provided in.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1 rack cabinet
2 Front door
3 Rear door
4 Duct
5 compartment
6 Radiator unit
7 Server (heating element)
8a, 8b compressor
9a, 9b condenser
10a, 10b expansion valve
11a, 11b evaporator
12 door fan
13 Radiator fan
14 Compressor room
15 opening
16 Branch
17 Door open / close detection sensor
20 Server inlet temperature sensor
21 Exhaust temperature sensor
22 Duct temperature sensor
23 Evaporator inlet temperature sensor
24 Compressor suction temperature sensor
25 Outside temperature sensor
100 electronic equipment

Claims (13)

A rack cabinet having a storage section for storing an electronic device as a heating element;
A front door and a rear door attached to the rack cabinet so as to face each other with the storage portion interposed therebetween;
A first evaporator provided in the front door and forming a first refrigeration cycle;
A second evaporator provided in the back door and forming a second refrigeration cycle;
The air flowing through the storage unit is cooled by heat exchange in the first and second evaporators, and the cooled air is supplied from the first evaporator, the storage unit, and the second evaporator. A controller that controls the first and second refrigeration cycles to circulate to the first evaporator;
Having a detector for detecting the opening and closing of the door;
The control unit includes the first and second refrigeration cycles such that the refrigerant evaporation temperature of the second evaporator is equal to or lower than the refrigerant evaporation temperature of the first evaporator based on the door opening / closing detection output by the detection unit. Is controlled for a predetermined time. The electronic device apparatus according to claim 1,
The control unit obtains a dew condensation temperature based on a preset target humidity of the storage unit and a target temperature of air flowing into the storage unit, and the calculated dew temperature is used as a refrigerant evaporation temperature of the second evaporator. An electronic apparatus device characterized by that. The electronic device device according to claim 1 or 2,
The electronic device apparatus, wherein the control unit sets a time for controlling the first and second refrigeration cycles based on a volume of the storage unit or a flow rate of the circulating air. The electronic device apparatus according to claim 1 or 2,
The first refrigeration cycle is formed by connecting a first compressor, a first condenser, a first expansion valve, and the first evaporator with a pipe through which a refrigerant flows,
The second refrigeration cycle is formed by connecting a second compressor, a second condenser, a second expansion valve, and the second evaporator with piping through which a refrigerant flows,
The first and second condensers are disposed in a radiator unit provided in an upper portion of the rack cabinet;
An electronic device apparatus, wherein the first and second compressors and the first and second expansion valves are arranged at the bottom of the rack cabinet. The electronic device apparatus according to claim 1 or 2,
The first refrigeration cycle is formed by connecting a compressor, a condenser, a first branch, a first expansion valve, and the first evaporator with a pipe through which a refrigerant flows,
The second refrigeration cycle is formed by connecting the compressor, the condenser, the second branch, the second expansion valve, and the second evaporator with a pipe through which a refrigerant flows,
The compressor, the condenser, the first and second branch parts, and the first and second expansion valves are arranged in a radiator unit provided at the bottom of the rack cabinet. Equipment device. The electronic device according to claim 1 or 2,
The first refrigeration cycle is formed by connecting a compressor, a first condenser, a first branch, a first expansion valve, and the first evaporator with a pipe through which a refrigerant flows,
The second refrigeration cycle is formed by connecting the compressor, the second condenser, the second branch, the second expansion valve, and the second evaporator with a pipe through which a refrigerant flows. ,
The first and second condensers are disposed in a radiator unit provided in an upper portion of the rack cabinet;
An electronic device apparatus, wherein the compressor, the first and second branch portions, and the first and second expansion valves are arranged at the bottom of the rack cabinet. An electronic device apparatus according to claim 1 or claim 2,
The control unit controls the first and second refrigeration cycles so that the refrigerant evaporation temperature of the first evaporator is equal to or lower than the refrigerant evaporation temperature of the second evaporator after the predetermined time has elapsed. Electronic equipment device. The electronic device apparatus according to claim 1 or 2,
The electronic device apparatus, wherein the detection unit includes a magnetic sensor or an optical sensor and detects opening and closing of the door. The electronic device apparatus according to claim 1 or 2,
The detection unit includes at least a first temperature sensor that measures the temperature of the air flowing into the storage unit and a second temperature sensor that measures the outside air temperature, and is based on outputs of the first and second temperature sensors. An electronic device apparatus that detects opening and closing of the door. A rack cabinet having a storage section capable of storing an electronic device as a heating element;
A front door and a rear door attached to the rack cabinet so as to face each other with the storage portion interposed therebetween;
A first evaporator provided in the front door and forming a first refrigeration cycle;
A second evaporator provided in the back door and forming a second refrigeration cycle;
The air flowing through the storage unit is cooled by heat exchange in the first and second evaporators, and the cooled air is cooled from the first evaporator, the storage unit, and the second evaporator. A controller that controls the first and second refrigeration cycles to circulate to the first evaporator;
Having a detector for detecting the opening and closing of the door;
The control unit includes the first and second refrigeration cycles such that the refrigerant evaporation temperature of the second evaporator is equal to or lower than the refrigerant evaporation temperature of the first evaporator based on the door opening / closing detection output by the detection unit. A housing for an electronic device device, characterized in that the electronic device is controlled for a predetermined time. A housing for an electronic device according to claim 10,
The control unit obtains a dew condensation temperature based on a preset target humidity of the storage unit and a target temperature of air flowing into the storage unit, and the calculated dew temperature is used as a refrigerant evaporation temperature of the second evaporator. A housing of an electronic device device. A housing of the electronic device according to claim 10 or 11,
The control unit sets a time for controlling the first and second refrigeration cycles based on the volume of the storage unit or the flow rate of the circulating air. A housing of the electronic device according to claim 10 or 11,
The first refrigeration cycle is formed by connecting a first compressor, a first condenser, a first expansion valve, and the first evaporator with a pipe through which a refrigerant flows,
The second refrigeration cycle is formed by connecting a second compressor, a second condenser, a second expansion valve, and the second evaporator with piping through which a refrigerant flows,
The first and second condensers are disposed in a radiator unit provided in an upper portion of the rack cabinet;
A housing for an electronic device, wherein the first and second compressors and the first and second expansion valves are arranged at the bottom of the rack cabinet.

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