JP2009193137A - Electronic equipment cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively cool electronic equipment even when a plurality of pieces of electronic equipment with different thermal loads are mixed and stored inside a cabinet without using water. <P>SOLUTION: An electronic equipment cooling system 1 includes the cabinet 11 for storing the plurality of pieces of the electronic equipment 3 with fans 4, where the front and the rear surface are opened. A rear door 12 for ventilation is arranged in the rear surface opening of the cabinet 11. Evaporators 22, 23 (22A, 23A) constituting a refrigeration cycle are arranged between the rear door 12 and the electronic equipment 3, and are the fin-and-tube type evaporators. The respective refrigerant pipings 71A-71C, 72A-72C (71D, 72D) of the plurality of evaporators 22, 23 (22A, 23A) are extended corresponding to the plurality of pieces of electronic equipment 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device cooling system that cools air blown by a fan attached to an electronic device housed in a cabinet.

In general, an air-water heat exchanger is disposed on the air outlet side of a cabinet for accommodating a plurality of electronic devices, and the air blown by a fan attached to the electronic device accommodated in the cabinet is used as the air-water heat. An electronic device cooling system that is cooled by an exchanger and returned to the room is known (for example, see Patent Document 1). This type of electronic device cooling system is installed in a computer room, and cools a server computer (hereinafter simply referred to as “server”) and a network device installed in the computer room.
US Patent Application Publication No. 2006/0232945

By the way, since electronic devices are vulnerable to water, it is desirable not to bring water into the computer room. For this reason, instead of an air-water heat exchanger in which chiller water circulates, a so-called fin-and-tube evaporator in which a refrigerant is circulated by constituting a refrigeration cycle has been devised.
Moreover, the temperature (heat load) of the air blown from the plurality of electronic devices to the evaporator by the fan may differ depending on the type and operating state of the electronic device. Furthermore, not all the electronic devices that can be accommodated in the cabinet are installed.

In an electronic device cooling system equipped with an evaporator, the refrigerant flow path of the evaporator is formed in a refrigerant circuit that branches from one refrigerant pipe to a plurality of refrigerant pipes, and the plurality of electronic devices are installed in parallel to the refrigerant pipe of the evaporator, respectively. Is done. Since the amount of refrigerant flowing through the plurality of refrigerant pipes is adjusted by a single expansion valve, when electronic devices with a large heat load and electronic devices with a small heat load are arranged in parallel in a parallel refrigerant circuit, The amount of the refrigerant in the entire refrigerant circuit is adjusted according to the electronic device having a small heat load, and there is a problem that the electronic device having a high heat load is not sufficiently cooled.
In addition, if there is a refrigerant pipe in which electronic devices are not juxtaposed in the parallel refrigerant circuit, the amount of refrigerant supplied to the refrigerant circuit in accordance with the refrigerant pipe is extremely reduced, and the refrigerant circuit is arranged in parallel with the refrigerant circuit. Most of the electronic equipment is not cooled.
Therefore, an object of the present invention is to provide an electronic device cooling system that can effectively cool electronic devices even when electronic devices having different heat loads are mixedly stored in a cabinet without using water. It is to provide.

In order to solve the above-described problems, an electronic device cooling system according to the present invention includes a cabinet having front and rear surfaces opened to accommodate a plurality of electronic devices with fans, and a rear door capable of ventilation is provided at the rear surface opening of the cabinet. A plurality of evaporators constituting a refrigeration cycle are disposed between the rear door and the electronic device, the evaporator being a fin-and-tube evaporator, and a plurality of refrigerant pipes of the plurality of evaporators. It extends corresponding to the electronic equipment of.
According to the above configuration, the electronic device cooling system of the present invention includes the fin-and-tube type evaporator between the rear door and the electronic device, and the evaporator constituting the refrigeration cycle includes a refrigerant circulating in the refrigeration cycle. Therefore, even if leakage occurs from the path through which the refrigerant circulates, the electronic device or the like can be protected. In addition, since each refrigerant pipe of a plurality of evaporators extends corresponding to a plurality of electronic devices, the electronic device cooling system of the present invention is a case where electronic devices with different thermal loads are housed together in a cabinet. However, the air including the exhaust heat of the electronic device blown by the fan can be effectively cooled. Furthermore, since the air containing the exhaust heat of the electronic device is cooled by the evaporator and returned to the room, it is possible to prevent the room temperature from excessively rising due to the heat generated by the electronic device and the occurrence of temperature distribution in the room.

  In the above-described configuration, the electronic devices may be accommodated in a vertical arrangement. In addition, the electronic devices may be stored horizontally arranged.

  According to the present invention, the fin-and-tube type evaporator is disposed between the rear door of the cabinet and the electronic device, and each refrigerant pipe of the plurality of evaporators corresponds to the plurality of electronic devices accommodated in the cabinet. Since it extends, the electronic device cooling system of the present invention can effectively cool an electronic device without using water even when electronic devices with different thermal loads are housed in the cabinet. .

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an electronic device cooling system according to an embodiment of the present invention.
The electronic device cooling system 1 includes a server rack 10 disposed inside the computer room 2 and a heat source unit 30 disposed outside the computer room 2. In the example shown in FIG. 1, twelve server racks 10 are arranged inside the computer room 2, four heat source units 30 are arranged outside the computer room 2, and three units are arranged in one heat source unit 30. The server racks 10 are connected to each other.

FIG. 2 is a schematic configuration diagram showing the server rack 10. In FIG. 2, the left side is the front side and the right side is the rear side.
The server rack 10 includes a cabinet 11 having an open front surface and a rear surface, and a plurality (six in this embodiment) of electronic devices 3 are vertically arranged in the cabinet 11 with the back surface facing the rear surface of the cabinet 11. Arranged. The rear surface of the cabinet 11 is provided with a rear door 12 that opens and closes the rear opening 65 so that it can be closed and a front door 14 that opens and closes the front opening 64 so that it can be closed. The rear door 12 and the front door 14 are configured to be ventilated by punching metal processing or the like, and an electronic device cooling unit 20 is configured integrally with the rear door 12. In addition, a caster 13 is provided at the bottom of the cabinet 11 so that the server rack 10 can be easily moved.

  The electronic device 3 is a server or a network device. In general, this type of electronic device 3 is a fan-equipped electronic device in which a cooling fan 4 is attached to the center of the back surface, and the temperature inside the electronic device 3 is a predetermined temperature. If it exceeds, the fan 4 is driven, indoor air is introduced into the electronic device 3 and a forced air cooling function is provided for discharging from the back of the device. For this reason, by arranging the electronic device 3 with the back surface thereof facing the back surface of the cabinet 11, the fan 4 of the electronic device 3 causes the fan 4 of the electronic device 3 to move from the front door 14 as shown in FIG. The sucked indoor air cools the electronic device 3, passes through the rear door 12, and returns to the room. Moreover, by opening the rear door 12 and the front door 14, access to the electronic device 3 in the cabinet 11 is facilitated.

  The electronic device cooling unit 20 is a unit that constitutes a refrigeration circuit that performs a refrigeration cycle by being piped to the heat source unit 30 (see FIG. 1), and a plurality of (three in this embodiment) server racks 10. Each of the electronic device cooling units 20 provided in is connected in parallel to a main refrigerant pipe 31 (see FIG. 1) extending from one heat source unit 30. Since the electronic device cooling unit 20 includes the evaporator 21, the air discharged from the electronic device 3 is cooled by the evaporator 21 when returning through the evaporator 21 and returns to the room.

Next, the server rack 10 will be described in detail.
FIG. 3 is an external view of the server rack 10, and FIG. 4 is a perspective view of the server rack 10 showing a state in which the rear door 12 is opened.
The cabinet 11 has a size that matches the standard of the electronic device 3 to be stored, and is formed in a rectangular shape including a sheet metal top plate 11A, a bottom plate 11B, and side plates 11C, 11D. In addition, the cabinet 11 includes a partition plate 11E disposed between the top plate 11A and the bottom plate 11B and substantially parallel to the top plate 11A and the bottom plate 11B, and the electronic device 3 is disposed on the partition plate 11E. The partition plate 11E is supported by support portions (not shown) formed on the side plates 11C and 11D, and a plurality of support portions are provided at predetermined intervals in the vertical direction. As a result, the partition plate 11E can be disposed on a support portion at a desired position, or a plurality of partition plates 11E can be disposed in the cabinet 11.

  The rear door 12 is formed by bending a metal (for example, aluminum) plate. One end of the rear door 12 is connected to the cabinet 11 via a hinge 66 and is operated when the rear door 12 is opened and closed on the other end. A handle 67 is formed. When the handle 67 is operated to pull the handle 67 forward, the rear door 12 rotates about the hinge 66 as shown in FIG. 4 to open the rear opening 65 of the cabinet 11.

Further, as shown in FIG. 3, an opening 12A is formed in the approximate center of the outer surface of the rear door 12, and a surface material 69 in which a hole 68 having a predetermined diameter is formed on one surface in the opening 12A. Is arranged. The surface material 69 allows the rear door 12 to pass through the holes 68 and functions to prevent the evaporator 21 disposed inside the rear door 12 from being exposed to the outside, thereby improving the aesthetics of the server rack 10. ing.
Further, the front door 14 is provided with a surface material 69 provided in the rear door 12 so that the front door 14 can be ventilated.

  Here, each hole 68 of the surface material 69 is formed so as to have an opening ratio of, for example, 60% or more so as not to inhibit ventilation. Furthermore, the hole diameter of the hole 68 is set to be smaller than that of a human finger. According to this, for example, the operator of the electronic device 3 arranged in the server rack 10 is prevented from touching the evaporator 21 through the hole 68, and accidents such as injury of fingers with the evaporator 21 are prevented. Can do.

  On the inner surface of the rear door 12, as shown in FIG. 5, an evaporator 21, expansion valves 28 </ b> A and 28 </ b> B provided in a refrigerant pipe (liquid pipe) 27 connected to the evaporator 21, and the expansion valves 28 </ b> A and 28 </ b> B An electrical unit 51 for controlling the opening is integrally provided. Thus, by arranging the evaporator 21, the expansion valves 28 </ b> A and 28 </ b> B, and the electrical unit 51 integrally on the inner surface of the rear door 12, they can be handled as the integrated electronic device cooling unit 20.

The evaporator 21 is a fin-and-tube heat exchanger including a plurality of heat-radiating fins 70. When the same electronic device 3 is housed in the cabinet 11, the outlets 4 </ b> A of the electronic device 3 are arranged in a vertical row, so that the evaporator 21 is formed in a flat plate shape on the inner surface of the rear door 12. It extends vertically with a width sufficient to cover the air outlet 4A provided at the center of the back surface of the air.
Further, the evaporator 21 is divided into a plurality of (two in the present embodiment) evaporators 22 and 23, and the upper evaporator 22 takes charge of cooling the electronic device 3 arranged in the upper half of the cabinet 11, The lower evaporator 23 is configured to cool the electronic device 3 arranged in the lower half. Further, the evaporators 22 and 23 are provided with refrigerant pipes (liquid branch pipes) 71 and 72 connected to the evaporators 22 and 23, respectively, and a merged refrigerant pipe (gas pipe) 29.
In this configuration, since the refrigerant circulating in the refrigeration cycle is supplied to the evaporator 21, even if the refrigerant leaks from the path through which the refrigerant circulates, the refrigerant evaporates immediately, and the electronic device 3 Etc. are protected.

  Since the electrical unit 51 is disposed in a lower region of the evaporator 21, a part of the air cooled by the evaporator 21 is lowered to cool the electrical unit 51, so that the electrical unit 51 itself is cooled. There is no need to install equipment.

On the inner surface of the rear door 12, as shown in FIGS. 4 and 5, a cover material 74 having a hole 73 having a predetermined diameter formed on one surface so as to cover the evaporator 21 is disposed. The cover material 74 is formed of a punching plate like the surface material 69 and allows the rear door 12 to pass through each hole 73.
Even when the rear door 12 is opened, the cover member 74 prevents a person other than the service person of the electronic device cooling unit 20 from touching the fins 70 of the evaporator 21 by mistake. The cover member 74 is fixed to the rear door 12 with screws through screw holes (not shown) formed in the periphery. Here, it is desirable that a part of the screw hole be a dharma hole so that the cover member 74 is hooked on a screw temporarily fixed to the rear door 12. According to this, since the cover material 74 can be temporarily fixed to the rear door 12 during maintenance, the cover material 74 can be easily attached to and detached from the rear door 12.

The cover member 74 includes a pair of handles 75 for handling the cover member 74. The handles 75 are respectively attached to the substantially central edge of the cover member 74 in the height direction and do not hinder ventilation.
Furthermore, an opening 76 is formed in the cover material 74 at a position corresponding to the expansion valves 28 </ b> A and 28 </ b> B when the cover material 74 is attached to the rear door 12. This opening 76 is for maintaining the expansion valves 28A and 28B without removing the cover material 74. For example, the operation of the expansion valves 28A and 28B can be confirmed, or the coil portions of the expansion valves 28A and 28B can be If defective, the coil portion can be exchanged through the opening 76.

A drain pan 77 that receives drain water flowing down from the evaporator 21 is provided below the evaporator 21. The drain pan 77 is located above the electrical unit 51 and prevents the drain water from falling into the electrical unit 51 and the computer room 2.
In this configuration, the computer room 2 maintains a predetermined temperature and humidity (for example, 25 ° C. and 50%) by a separate air conditioner (not shown), and under this temperature and humidity condition, it is as much as possible. The operation of the electronic device cooling system 1 is controlled to prevent condensation. Therefore, although it is not assumed that drain water is accumulated in the drain pan 77 in a normal operation state, even if condensation occurs in the evaporator 21 for some reason, the condensed water (drain water) is supplied to the electrical unit 51. It doesn't fall.

FIG. 6 is a diagram illustrating a circuit configuration of the electronic device cooling apparatus.
The electronic device cooling device 40 includes three electronic device cooling units 20 and a heat source device 30 to which these electronic device cooling units 20 are connected by piping.
The electronic device cooling unit 20 is connected in parallel to the main liquid pipe 31 </ b> A and the main gas pipe 31 </ b> B constituting the main refrigerant pipe 31 extending from the heat source device 30 via the flexible liquid pipe 25 and the flexible gas pipe 26. As the flexible liquid pipe 25 and the flexible gas pipe 26, a flexible tube having flexibility and refrigerant impermeability is applied. As the flexible liquid pipe 25, a relatively small diameter tube is applied, and the flexible gas pipe 26 has a relatively large diameter. A tube is applied.

  One end of the flexible liquid pipe 25 and the flexible gas pipe 26 is connected to the main liquid pipe 31A and the main gas pipe 31B extending from the heat source unit 30, respectively. The other end of the flexible liquid pipe 25 is connected to the liquid pipe connection part PIN of the electronic device cooling unit 20. The liquid pipe 27 extending from the liquid pipe connection portion PIN branches into two liquid branch pipes 71 and 72 via the flow divider 24A, and one liquid branch pipe 71 passes through the expansion valve 28A and is located below the evaporator 22. Connected to the entrance. The other liquid branch pipe 72 is connected to the lower inlet of the evaporator 23 through the expansion valve 28B.

The outlets of the evaporators 22 and 23 are connected to a single gas pipe 29, and a flexible gas pipe 26 is connected to a gas pipe connection POUT provided at the end of the gas pipe 29.
Thus, since the evaporator 21 of the electronic device cooling unit 20 is connected via the flexible liquid pipe 25 and the flexible gas pipe 26, when the rear door 12 (see FIG. 5) in which the evaporator 21 is built is opened and closed, The flexible liquid pipe 25 and the flexible gas pipe 26 are bent to prevent the rear door 12 from being opened and closed. Further, the position of the server rack 10 can be finely adjusted even when these pipes are connected.

  Here, as shown in FIG. 1, the main refrigerant pipe 31 is routed through the underfloor space between the upper floor 2A and the lower floor 2B of the computer room 2, and is connected to the main liquid pipe 31A and the main gas pipe 31B. As shown in FIG. 2, the liquid pipe 25 and the flexible gas pipe 26 are connected to the evaporator 21 in the rear door 12 through the opening hole 2C of the upper floor 2A. Therefore, after the flexible liquid pipe 25 and the flexible gas pipe 26 extend downward from the evaporator 21, the flexible liquid pipe 25 and the flexible gas pipe 26 are drawn so as to bend gently in the underfloor space. When the rear door 12 is opened and closed, only the flexible liquid pipe 25 and the flexible gas pipe 26 move in accordance with the movement of the rear door 12. Accordingly, no force is applied to the other pipes when the rear door 12 is opened and closed, and the steel pipes can be applied to the other pipes, for example, the main liquid pipe 31A and the main gas pipe 31B.

  As shown in FIG. 6, the electronic device cooling unit 20 is provided with an electrical unit 51 below the evaporator 21 and a remote controller 52 connected to the electrical unit 51. This electrical unit 51 includes an inlet refrigerant temperature L1 and an outlet refrigerant temperature G1 of the evaporator 22, an inlet refrigerant temperature L2 and an outlet refrigerant temperature G2 of the evaporator 23, and four temperature sensors (refrigerant temperature detection means) 29A to 29D. And controlling the expansion valves 28A and 28B so as to obtain an appropriate degree of superheat based on the temperature difference (L1-G1, L2-G2) between the evaporators 22 and 23, and the heat source device 30 to communicate with the network.

  The remote controller 52 is disposed on the side surface or the back surface of the server rack 10 (see FIG. 4), and is connected to the electrical unit 51 by wire or wirelessly. Although not shown, the remote controller 52 is provided with an indoor temperature sensor, an operation button, a display unit, a buzzer (sounding unit), and the like. The operation of the electronic device cooling device 40 is started according to the operation of the remote controller 52. / Stop, change of set temperature T0, notification of various error messages (display and buzzer sound output), etc. are performed. Here, the set temperature T0 is the target temperature of the electronic device cooling unit 20, and normally the indoor target temperature of the computer room 2 is set. And in this electronic device cooling device 40, control of each part is performed so that the temperature of the air which enters from the front door 14 (refer FIG. 4) or the air which passed the evaporator 21 becomes set temperature T0. .

The heat source unit 30 is connected by piping in the order of a compressor 32 that compresses refrigerant, an oil separator 33, a four-way valve 34, a heat source side heat exchanger (condenser) 35, an expansion valve 36, and a receiver tank 37. A main liquid pipe 31 </ b> A is connected to the receiver tank 37, and a main gas pipe 31 </ b> B is connected to a low-pressure side pipe 41 connected to the compressor 32 inlet via an accumulator 38.
The compressor 32 has an AC compressor (constant capacity type compressor) 32A for constant speed operation and an inverter compressor (variable capacity type compressor) 32B for variable frequency operation, which are in parallel. Connected. The heat source device 30 as a whole can be cooled by variably controlling the on / off control of the operation of the compressors 32A and 32B and the operation frequency of the compressor 32B in accordance with the cooling load.

More specifically, check valves 42A and 42B are provided on the discharge sides of the compressors 32A and 32B, respectively, and the oil separator 33 is connected to the high-pressure side pipe 42 that merges downstream of the check valves 42A and 42B. The check valve 43, the four-way valve 34, the heat source side heat exchanger 35, the expansion valve 36, and the receiver tank 37 are sequentially connected. The low-pressure side pipe 41 connected to the suction side of each compressor 32A, 32B is connected downstream of the accumulator 38, connected to the four-way valve 34 upstream of the accumulator 38, and connected to the main gas pipe 31B via the four-way valve 34. Connected. The four-way valve 34 is not switched and is fixed to the state shown in FIG.
Further, a check valve 44 is connected to the high-pressure side pipe 42 in parallel with the expansion valve 36, and the check valve 44 allows a flow from the heat source side heat exchanger 35 to the receiver tank 37 and a reverse flow. Is prohibited. A refrigerant return pipe 45 is connected between the check valves 42A and 42B and the oil separator 33, and the tip of the refrigerant return pipe 45 is connected to the suction side of the compressors 32A and 32B. The refrigerant return pipe 45 is provided with an opening / closing valve 46, and by opening the opening / closing valve 46, a part of the refrigerant discharged from the compressors 32A, 32B can be returned to the suction side of the compressors 32A, 32B. The discharge capacity of the compressors 32A and 32B can be reduced.

  The high pressure side pipe 42 is connected to the main liquid pipe 31A via the liquid side service valve 47, and the low pressure side pipe 41 is connected to the main gas pipe 31B via the gas side service valve 48. The oil separated by the oil separator 33 is returned to the suction side of the compressors 32A and 32B through the oil return pipe 49. In addition, the high pressure side of one compressor 32A, 32B and the low pressure side of the other compressor 32B, 32A are connected to each other by oil return pipes 32C, 32D, and the oil amount in each compressor 32A, 32B is adjusted appropriately. Is done. Further, high pressure switches 5A and 5B are respectively provided on the discharge side of the compressors 32A and 32B. When the discharge pressures of the compressors 32A and 32B exceed the upper limit of the allowable range by the high pressure switches 5A and 5B, the compressors are provided. The operation of 32A and 32B is stopped.

  The heat source unit 30 includes an electrical unit 61, and the electrical unit 61 is communicably connected to the electrical unit 51 of the electronic device cooling unit 20 connected to the heat source unit 30 via the internal / external communication line 62. . The electrical unit 61 transmits / receives control signals and operation signals to / from the electrical unit 51 of each electronic device cooling unit 20 and cools the electronic device according to the operation of the remote controller 52 provided on the electronic device cooling unit 20 side. Each part of the device 40 is controlled.

Next, an operation in which the electronic device cooling device 40 cools the electronic device 3 will be described.
The electronic device cooling device 40 operates the compressors 32 </ b> A and 32 </ b> B under the control of the electrical unit 51. In this case, the electrical unit 51 operates each of the compressors 32A and 32B based on the difference between the outdoor temperature T2 detected by a temperature sensor (not shown) and the indoor temperature T1 detected by the remote controller 52. The temperature of the expansion valve 36 is controlled so that the inlet / outlet temperature of the heat source side heat exchanger 35 is detected by a temperature sensor (not shown) and the temperature difference between the inlet and outlet is within an appropriate range. Control.
In this case, the high-temperature and high-pressure refrigerant discharged from the compressors 32 </ b> A and 32 </ b> B is condensed and liquefied by the heat source side heat exchanger 35, and then passes through the main liquid pipe 31 </ b> A extending from the heat source device 30 to be electronic in the computer room 2. It is supplied to the equipment cooling unit 20.

In each electronic device cooling unit 20, the liquid refrigerant flowing through the main liquid pipe 31A flows through the flexible liquid pipe 25 and flows through the liquid pipe 27, where it is divided into two systems, one of which passes through the expansion valve 28A and evaporates upward. The other flows through the expansion valve 28B and the lower evaporator 23, evaporates and gasifies in each of the evaporators 22 and 23, and the evaporator evaporates by the heat of refrigerant evaporation in each of the evaporators 22 and 23. The air including the exhaust heat of the electronic device 3 passing through 22 and 23 is cooled.
The refrigerant gasified in each of the evaporators 22 and 23 merges in the gas pipe 29, then flows through the flexible gas pipe 26 to the main gas pipe 31 </ b> B, and returns to the heat source unit 30. The refrigeration cycle is performed as described above.

FIG. 7 is a schematic diagram showing the relationship between the electronic device 3 and the evaporator 21.
The evaporator 21 including a plurality of heat radiation fins 70 extending in the lateral direction is divided into an upper evaporator 22 and a lower evaporator 23, and a liquid branch pipe 71 connected to the evaporator 22 has an expansion valve 28A. As described above, the refrigerant is further branched into a plurality (three in the present embodiment) of refrigerant pipes 71A to 71C via the flow divider 24B. The refrigerant pipes 71 </ b> A to 71 </ b> C in the evaporator 22 extend vertically so as to correspond to all (three) electronic devices 3 arranged vertically in the upper half of the cabinet 11.
Further, the liquid branch pipe 72 connected to the evaporator 23 passes through the expansion valve 28B, and further branches into a plurality (three in the present embodiment) of refrigerant pipes 72A to 72C via the flow divider 24C. The refrigerant pipes 72 </ b> A to 72 </ b> C in the evaporator 23 extend vertically so as to correspond to all (three) electronic devices 3 arranged vertically in the lower half of the cabinet 11.

As described above, the evaporator 21 extends vertically with a width sufficient to cover the air outlet 4A provided in the center of the back surface of the electronic device 3, so that the air including the exhaust heat of the electronic device 3 is evaporated. It is easy to hit the approximate center of 21.
For example, if the same amount of refrigerant is caused to flow through the refrigerant pipes 71A to 71C of such an evaporator 21, the approximate center of the evaporator 21 that is easily exposed to air including exhaust heat of the electronic device 3, that is, the approximate center of the outlet 4A is provided. In the refrigerant pipe 71A that passes through, the refrigerant evaporates quickly, and in the refrigerant pipes 71B and 71C that pass through the end of the air outlet 4A where the air including the exhaust heat of the electronic device 3 is hard to hit, the refrigerant does not evaporate and returns as a liquid. A so-called liquid back phenomenon occurs. Normally, the amount of refrigerant in the entire refrigerant pipes 71A to 71C is adjusted so that the liquid back phenomenon does not occur. As a result, the electronic device 3 may not be sufficiently cooled.
According to the evaporator 21 of the present invention, the diameters of the refrigerant pipes 71A and 72A passing through the outlet 4A are the other refrigerant pipes 71B, 71C, 72B, and 72C in accordance with the amount of air blown from the electronic device 3 to the evaporator 21. Since the refrigerant is formed so as to have a larger diameter than that of the refrigerant pipe 71A and 72A, more refrigerant flows through the refrigerant pipes 71A and 72A. Therefore, the electronic device 3 can be effectively cooled.

Further, each of the refrigerant pipes 71A to 71C in the evaporator 22 is arranged so as to pass through all the electronic devices 3 accommodated in the upper half of the cabinet 11 in order from the bottom, and two temperature sensors (refrigerant temperature detection means) 29A, Based on the difference (L1−G1) between the inlet refrigerant temperature L1 and the outlet refrigerant temperature G1 of the evaporator 22 respectively detected through 29B, one expansion valve 28A is set so as to achieve an appropriate degree of superheat in the three electronic devices 3. Adjusts the amount of refrigerant passing through all the refrigerant pipes 71A to 71C.
Similarly, each of the refrigerant pipes 72A to 72C in the evaporator 23 is arranged so as to pass through all the electronic devices 3 accommodated in the lower half of the cabinet 11 in order from the bottom, and two temperature sensors (refrigerant temperature detecting means) 29C. , 29D, based on the difference (L2-G2) between the inlet refrigerant temperature L2 and the outlet refrigerant temperature G2 of the evaporator 23, which are detected via 29D, one expansion valve so as to achieve an appropriate superheat degree in the three electronic devices 3 28B adjusts the amount of refrigerant passing through all the refrigerant pipes 72A to 72C.
Thereby, even if the electronic devices 3 with different thermal loads are accommodated in the cabinet 11, all the electronic devices 3 are effectively cooled.

  Here, as a configuration in which the evaporator 21 is provided with a control valve for adjusting the amount of refrigerant in each of the refrigerant pipes 71A to 71C and 72A to 72C, more refrigerant pipes 71A and 72A that pass through substantially the center of the outlet 4A are provided. A configuration in which a refrigerant flows may be used. Furthermore, when the blower outlet 4A is not provided in the center of the back surface of the electronic device 3, the evaporator 21 may be arranged according to the position where the blower outlet 4A of the electronic device 3 is arranged in a line. .

As another embodiment, it is possible to provide an evaporator 21 </ b> A having a different refrigerant pipe instead of the evaporator 21.
FIG. 8 is a schematic diagram showing the relationship between the electronic device 3 and the evaporator 21A.
The evaporator 21A is a fin-and-tube heat exchanger including a plurality of heat-radiating fins 70A extending in the vertical direction, and has a width sufficient to cover the electronic device 3 and the rear door 12 (see FIG. 5). Extends vertically to the inner surface. The evaporator 21A is divided into an upper evaporator 22A and a lower evaporator 23A, and a liquid branch pipe 71 connected to the evaporator 22A passes through an expansion valve 28A and is connected to a refrigerant pipe 71D of the evaporator 22A. The refrigerant pipe 71D is bent in a plurality of times and formed in a meandering shape. The straight pipe portion of the refrigerant pipe 71D extends in the horizontal direction, and all (three) electronic devices arranged vertically in the upper half of the cabinet 11 are arranged. 3, the entire refrigerant pipe 71D extends in the vertical direction.
The liquid branch pipe 72 connected to the evaporator 23A passes through the expansion valve 28B and is connected to the refrigerant pipe 72D of the evaporator 23A. The refrigerant pipe 72D is bent in a plurality of times and formed in a meandering shape, and the straight pipe portion of the refrigerant pipe 72D extends in the horizontal direction, and all (three) electronic devices arranged vertically in the lower half of the cabinet 11 3, the entire refrigerant pipe 72 </ b> D extends in the vertical direction.
Thus, since the refrigerant pipes 71D and 72D extend over the entire back surface of the electronic device 3, even when a plurality of electronic devices 3 having different positions of the outlet 4A are accommodated in the cabinet 11, all the electronic devices 3 are connected. It can be cooled effectively.

The refrigerant pipe 71D of the evaporator 22A is arranged so as to pass through all the electronic devices 3 accommodated in the upper half of the cabinet 11 in order from the bottom, and is respectively connected via two temperature sensors (refrigerant temperature detection means) 29A and 29B. Based on the detected difference (L1-G1) between the inlet refrigerant temperature L1 and the outlet refrigerant temperature G1 of the evaporator 22A, the refrigerant through which the expansion valve 28A passes through the refrigerant pipe 71D so as to have an appropriate degree of superheat in the three electronic devices 3 The amount is adjusted.
Similarly, the refrigerant pipe 72D of the evaporator 23A is arranged so as to pass through all the electronic devices 3 accommodated in the lower half of the cabinet 11 in order from the bottom, and includes two temperature sensors (refrigerant temperature detection means) 29C and 29D. The expansion valve 28B is connected to the refrigerant pipe 72D so as to achieve an appropriate degree of superheat in the three electronic devices 3 based on the difference (L2−G2) between the inlet refrigerant temperature L2 and the outlet refrigerant temperature G2 of the evaporator 23A detected through The amount of refrigerant passing through is adjusted.
Thereby, even if the electronic devices 3 with different thermal loads are accommodated in the cabinet 11, all the electronic devices 3 are effectively cooled.

  As described above, according to the present embodiment, the electronic device cooling system 1 according to the present invention includes the cabinet 11 having front and rear surfaces that are open to accommodate the plurality of electronic devices 3 with the fans 4. 11 is provided with a rear door 12 which can be ventilated, and a plurality of fin-and-tube evaporators 22 and 23 (22A and 23A) are arranged between the rear door 12 and the electronic device 3, The evaporators 22 and 23 (22A and 23A) constituting the cycle are supplied with refrigerant circulating through the refrigeration cycle, and thus protect the electronic device 3 and the like even if leakage occurs from the path through which the refrigerant circulates. be able to. Moreover, since each refrigerant | coolant piping 71A-71C, 72A-72C (71D, 72D) of several evaporators 22 and 23 (22A, 23A) respond | corresponds to several electronic devices 3, it is ventilated with the fan 4. The air including the exhaust heat of the electronic device 3 is effectively cooled. Furthermore, since the air including the exhaust heat of the electronic device 3 is cooled by the evaporator 21 (21A) and returned to the room, the room temperature is excessively increased by the heat generated by the electronic device 3, and a temperature distribution is generated in the room. It is prevented.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, since the electronic device 3 housed in the cabinet 11 is horizontally long, the partition plate 11E is disposed horizontally, the interior of the cabinet 11 is divided in the vertical direction, and the refrigerant pipes 71A to 72C. , 72A to 72C (71D, 72D) have been described as extending vertically. However, when a vertically long electronic device is accommodated in the cabinet 11, the partition plates are arranged vertically so that the inside of the cabinet 11 is left and right. It is good also as a structure which divides | segments into a direction and arranges and stores the electronic device 3 horizontally. In this case, the evaporator 21 (21A) may be extended horizontally, the evaporator 21 (21A) may be divided in the left-right direction, and the refrigerant pipe may be extended in the horizontal direction.

  Moreover, in the said embodiment, it described about the structure which divides | segments the evaporator 21 (21A) into the two evaporators 22 and 23 (22A, 23A) on the boundary of the partition plate 11E which divides the inside of the cabinet 11 into two up and down. However, the configuration is not limited to this, and the cabinet 11 may be divided into three or more. Specifically, if the partition plate 11E in the cabinet 11 has a three-stage configuration, the evaporator 21 (21A) is divided into three parts in the vertical direction or the left-right direction with these partition plates 11E as a boundary, and is divided into a plurality of these. In addition, an expansion valve may be provided in each evaporator, and the refrigerant flow control corresponding to the number of stages of the partition plate 11E may be performed. In addition, a plurality of evaporators are provided vertically or horizontally in one stage, and an expansion valve is provided in each evaporator to cool different heat radiation for each region according to the operating state of the electronic device 3 in the same stage. In this way, each expansion valve may be individually controlled. According to this configuration, even if the number of electronic devices 3 accommodated in the cabinet 11 increases, all the electronic devices 3 are effectively cooled.

Moreover, although the case where the air-cooled heat source device 30 is used has been described in the above embodiment, the present invention is not limited to this, and a water-cooled heat source device may be used. When using a water-cooled heat source unit, the heat source unit is connected to a water pipe extending from a cooling tower (not shown), so a plurality of heat source units can be stacked and the space for arranging the heat source unit is relatively small. be able to.
Moreover, it is good also as a structure which connects an air conditioning apparatus to the main refrigerant | coolant piping extended from the heat source machine 30, and performs the air conditioning in the computer room 2 by this air conditioning apparatus.

Further, the heat source device 30 described above may be configured as a dedicated cooling (cooling) cycle machine that does not have the four-way valve 34.
In addition, the compressor 32 included in the heat source device 30 is of a type driven by an electric motor, that is, a so-called EHP (electric heat pump) type, but is not limited thereto, and the compressor is driven by a gas engine. A GHP (gas heat pump) type heat source machine to be driven may be used.

It is a figure which shows the electronic device cooling system which concerns on embodiment of this invention. It is a schematic block diagram which shows a server rack. It is an external view of a server rack. It is a perspective view of the server rack of the state which opened the rear door. It is a perspective view which shows the state which removed the cover material in FIG. It is a figure which shows the circuit structure of an electronic device cooling device. It is a schematic diagram which shows the relationship between an electronic device and an evaporator. It is a schematic diagram which shows the relationship between an electronic device and the evaporator which concerns on another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device cooling system 3 Electronic device 4 Fan 4A Outlet 10 Server rack 11 Cabinet 12 Rear door 20 Electronic device cooling unit 21, 21A, 22, 22A, 23, 23A Evaporator 71, 72 Refrigerant piping (liquid branch pipe)
71A-71D, 72A-72D Refrigerant piping

Claims (3)

  A cabinet having front and rear openings for storing a plurality of electronic devices with fans is provided, a rear door capable of ventilation is provided at the rear opening of the cabinet, and a refrigeration cycle is provided between the rear door and the electronic devices. A plurality of evaporators are arranged, the evaporator is a fin-and-tube type evaporator, and each refrigerant pipe of the plurality of evaporators extends corresponding to a plurality of electronic devices. Equipment cooling system.   The electronic device cooling system according to claim 1, wherein the electronic devices are stored in an up-and-down arrangement.   The electronic device cooling system according to claim 1, wherein the electronic devices are stored in a horizontal arrangement.

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