JP2009105142A - Electronic apparatus cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus cooling system for smoothly opening and closing a rear door even if an evaporator is provided at the rear door. <P>SOLUTION: An electronic apparatus cooling system comprises a cabinet 11 whose front surface and rear surface for housing a plurality of electronic apparatuses 3 with fans 4 are opened. A rear door 12 which makes ventilation possible is provided at a rear surface aperture 65 of the cabinet 11. An evaporator 21 constituting a cooling cycle is provided at the rear door 12. A flexible liquid pipe 25 with a small diameter and a flexible gas pipe 26 with a large diameter connected with the evaporator 21 are collectively arranged at the hinge 66 side in such a manner that the flexible gas pipe 26 is made closer more than the flexible liquid pipe 25 to the hinge 66 side of the rear door 12. Air blown by the fan 4 is cooled by the evaporator 21 of the rear door 12 and returned indoors. <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.

Generally, an air-water heat exchanger is arranged on the air outlet side of a cabinet for housing electronic equipment, and the air blown by a fan attached to the electronic equipment is cooled by the air-water heat exchanger. An electronic device cooling system that returns 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 servers and network devices installed in the computer room.
US Patent Application Publication No. 2006/0232945

By the way, it is desirable that electronic devices are vulnerable to water and do not bring water into the computer room. For this reason, it is conceivable that the rear door is provided with an evaporator that constitutes a refrigeration cycle and circulates refrigerant instead of an air-water heat exchanger that circulates chiller water.
However, when an evaporator is provided on the rear door, there is a problem in that opening and closing of the rear door is hindered because a refrigerant pipe extending from a heat source unit constituting the refrigeration cycle is connected to the evaporator.
Therefore, an object of the present invention is to provide an electronic device cooling system that can smoothly open and close the rear door even when an evaporator is provided on the rear door.

  In order to solve the above-described problems, the present invention includes a cabinet having front and rear openings for storing a plurality of electronic devices with fans, and a rear door that can be ventilated at the rear opening of the cabinet. Includes an evaporator constituting a refrigeration cycle, and the small-diameter liquid pipe and the large-diameter gas pipe connected to the evaporator are combined on the hinge side by bringing the gas pipe closer to the hinge side of the rear door than the liquid pipe. And cooling the air blown by the fan with the evaporator of the rear door and returning it to the room.

  According to this configuration, the rear door is provided with an evaporator constituting a refrigeration cycle, and the small-diameter liquid pipe and the large-diameter gas pipe connected to the evaporator are placed closer to the hinge side of the rear door than the liquid pipe. Since they are arranged together on the hinge side, when the rear door is opened and closed, the amount of deflection of the large-diameter gas pipe can be kept small, and the rear door can be opened and closed smoothly with a small force.

  The liquid pipe and the gas pipe may be a flexible liquid pipe and a flexible gas pipe respectively connected to a main liquid pipe and a main gas pipe extending from a heat source device having a compressor and a condenser.

  The cabinet is installed on a double floor having an upper floor arranged with a space on the lower floor, and the main liquid pipe and the main gas pipe are provided in the space. The flexible liquid pipe and the flexible gas pipe connected to the main gas pipe may be connected to the evaporator disposed at the rear door of the cabinet through an opening formed in the upper floor.

  According to the present invention, the rear door is provided with an evaporator constituting a refrigeration cycle, and the small-diameter liquid pipe and the large-diameter gas pipe connected to the evaporator are placed closer to the hinge side of the rear door than the liquid pipe. Since they are arranged together on the hinge side, when the rear door is opened and closed, the amount of deflection of the large-diameter gas pipe can be kept small, and the rear door can be opened and closed smoothly with a small force.

Hereinafter, embodiments of the present invention will be described in detail 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 is a system that cools a plurality of electronic devices 3 (see FIG. 2) disposed in a computer room 2. The computer room 2 has a double floor, and the server rack 10 is placed on the double floor.

  FIG. 2 is a diagram showing the server rack 10. The server rack 10 includes a cabinet 11 having an open front surface and a rear surface, and a plurality of electronic devices 3 are stacked in the cabinet 11 so as to be stacked up and down with the back surface facing the rear surface of the cabinet 11. In addition, a rear door 12 is provided on the rear surface of the cabinet 11 so as to open and close the rear opening so as to be closed. The rear door 12 is configured to be freely ventilated, and an electronic device cooling unit 20 is configured therein. Further, a caster 13 is provided at the bottom of the server rack 10 so that the server rack 10 can be easily moved.

  The electronic device 3 is a server or a network device. Generally, this type of electronic device is a fan-equipped electronic device provided with a cooling fan 4, and the fan 4 is driven when the temperature in the device exceeds a predetermined temperature. In addition, it has a forced air cooling function that introduces outside air into the equipment and discharges it from the back of the equipment. For this reason, by arranging the electronic device 3 with the rear surface thereof facing the rear surface of the cabinet 11, the indoor air is moved to the front surface of the cabinet by the fan 4 attached to the electronic device 3, as shown in FIG. The air is sucked from the opening, cools the electronic device 3, passes through the rear door 12, and returns to the room. Further, by opening the rear door 12, access to the electronic device 3 in the cabinet 11 is facilitated.

  The electronic device cooling unit 20 is configured integrally with the rear door 12 of the server rack 10, and the electronic device cooling units 20 provided in a plurality (three in this example) of the server racks 10 are combined into one heat source unit 30 (see FIG. 1) is connected in parallel to a main refrigerant pipe 31 (see FIG. 1) extending from the main refrigerant pipe 31. That is, the electronic device cooling device 40 is configured by the plurality (three) of the electronic device cooling units 20 and the heat source device 30 to which the electronic device cooling units 20 are connected by piping. In the example shown in FIG. 1, 12 server racks 10 are arranged in the computer room 2, and the electronic device cooling unit 20 in the three server racks 10 is connected to one heat source unit 30. The case where the electronic device cooling device 40 is arrange | positioned 4 systems is shown.

The electronic device cooling unit 20 is a unit that constitutes a refrigeration circuit that performs a refrigeration cycle by being connected to the heat source unit 30 by piping, and includes an evaporator 21 and is discharged from the electronic device 3 as shown in FIG. When air flows through the evaporator 21 in the rear door 12, the air is cooled by the evaporator 21 and returned to the room. The evaporator 21 extends substantially vertically above and below the rear door 12, and is divided into an upper evaporator 22 and a lower evaporator 23 with a substantially middle portion between the upper and lower sides, and cooling of the electronic device 3 in the upper half of the cabinet 11. Is configured so that the upper evaporation unit 22 is responsible for cooling the lower half of the electronic device 3.
In this configuration, since the refrigerant that circulates in the refrigeration cycle is supplied to the evaporator 21 of the electronic device cooling unit 20, even if a refrigerant leaks from the path through which the refrigerant circulates, the electronic device It is possible to prevent damage such as short circuit 3 or electric leakage.

  FIG. 3 is a diagram showing a circuit configuration of the electronic device cooling apparatus 40. As shown in this figure, the electronic device cooling unit 20 includes a flexible liquid pipe (liquid pipe) 25 and a flexible gas pipe with respect to the main liquid pipe 31A and the main gas pipe 31B constituting the main refrigerant pipe 31 extending from the heat source unit 30. They are connected in parallel via a (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 refrigerant pipe (liquid pipe) 27 extending from the liquid pipe connecting portion PIN branches into two, and one liquid branch pipe 27A is connected to the inlet of the upper evaporation section 22 through the expansion valve 28A, and the other liquid branch pipe. 27B is connected to the inlet of the lower evaporator 23 via the expansion valve 28B.
The outlets of the evaporating units 22 and 23 are connected to one merging refrigerant pipe (gas pipe) 29, and the flexible gas pipe 26 is connected to the gas pipe connecting part POUT provided at the end of the merging refrigerant pipe 29. . Thus, the refrigerant pipe is connected to the evaporation units 22 and 23 in the electronic device cooling unit 20 so that the refrigerant can be selectively circulated.
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, the flexible pipes 25, 26 are opened when the rear door 12 in which the evaporator 21 is built is opened and closed. Does not hinder the opening and closing of the rear door 12. 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 liquid pipe 31A and the main gas pipe 31B are routed in the underfloor space between the upper floor 2A and the lower floor 2B of the computer room 2, and the main liquid pipe 31A and the main gas pipe 31B. The flexible liquid pipe 25 and the flexible gas pipe 26 connected to the gas pipe 31B are connected to the evaporator 21 in the rear door 12 through the opening hole 2C (see FIG. 2) of the upper floor 2A. For this reason, as shown in FIG. 2, the flexible liquid pipe 25 and the flexible gas pipe 26 extend downward from the evaporator 21 and then are routed so as to bend gently in the underfloor space. By providing a sufficient margin, only the flexible pipes 25 and 26 move in accordance with the movement of the rear door 12 when the rear door 12 is opened and closed. 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.

  In the electronic device cooling unit 20, an electrical unit (electrical box) 51 and a remote controller 52 connected to the electrical unit 51 are provided below the evaporator 21. The electrical unit 51 includes an inlet refrigerant temperature L1 and an outlet refrigerant temperature G1 of the upper evaporator 22, and an inlet refrigerant temperature L2 and an outlet refrigerant temperature G2 of the lower evaporator 23 via four temperature sensors 29A to 29D. Each of the expansion valves 28A and 28B is controlled so as to have an appropriate degree of superheat based on the temperature difference (L1-G1, L2-G2) of the respective outlets 22 and 23, and the heat source unit 30. The function to communicate with.

  The remote controller 52 is disposed on the side surface or the back surface of the server rack 10 in the computer room 2 and connected to the electrical unit 51 in the rear door 12 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. 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 entered from the front side opening of the cabinet 11, or the air which passed the evaporator 21 becomes this preset temperature T0.

The heat source device 30 is installed outside the room, and generally includes a compressor 32 that compresses the 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. The main liquid pipe 31 </ b> A is connected to the receiver tank 37 in order, and the main gas pipe 31 </ b> B is connected to the low-pressure side pipe 41 connected to the compressor 32 inlet via the 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. The cooling capacity of the heat source unit 30 as a whole is configured by being connected and variably controlling the operation frequency of the compressor 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 pressure of the compressors 32A and 32B exceeds the upper limit of the allowable range by the high pressure switches 5 and 6, each compressor 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 an internal / external communication line 62. The The electrical unit 61 transmits and receives control signals and operation signals to and from the electrical unit 51 of each electronic device cooling unit 20, and inputs the operation of the remote controller 52 provided on the electronic device cooling unit 20 side. Thus, each part of the electronic device cooling apparatus 40 is controlled.

In the electronic device cooling apparatus 40, the compressors 32A and 32B are operated under the control of the electrical unit 51 of the heat source unit 30. In this case, the electrical unit 51 operates 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 temperature difference between the entrance and exit of the heat source side heat exchanger 35 is detected by a temperature sensor (not shown). 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 passes through the upper evaporation section. 22, and the other flows through the lower evaporation section 23 through the expansion valve 28 </ b> B, evaporates and gasifies in each evaporation section 22, 23, and each evaporation section 22 is generated by the refrigerant evaporation heat in each evaporation section 22, 23. , 23 is cooled.
The refrigerant gasified in each of the evaporation units 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.

Next, the server rack will be described.
FIG. 4 is an external view of the server rack, and FIG. 5 is a perspective view showing a state in which the rear door is opened. The server rack 10 includes a cabinet 11 for storing the electronic device 3 (see FIG. 2), and a rear door 12 that opens and closes a rear opening 65 of the cabinet 11 so as to be freely closed.
The cabinet 11 has a size that matches the standard of the electronic device 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 and 11D. A front opening 64 (see FIG. 1) and a rear opening 65 are respectively formed on the front surface and the rear surface of the cabinet 11, and the indoor air of the computer room 2 flows into the cabinet 11 through the openings 64 and 65. Further, the cabinet 11 includes a partition plate (shelf) 11E disposed between the top plate 11A and the bottom plate 11B substantially parallel to the top plate 11A and the bottom plate 11B. This partition plate 11E partitions the inside of the cabinet 11, and the electronic device 3 is arrange | positioned on the partition plate 11E. The partition plate 11E is supported by support portions (not shown) formed on both 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 the support portion at a desired position, or a plurality of the 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 and the handle 67 is pulled toward the front side, the rear door 12 rotates about the hinge 66 as shown in FIG. 5 to open the rear surface opening 65 of the cabinet 11.
Further, as shown in FIG. 4, an opening 12A is formed in a substantially central portion of the outer surface of the rear door 12, and a surface material in which a hole 68 having a predetermined diameter is formed on one surface in the opening 12A. 69 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.
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. Further, the diameter of the hole 68 is set to be smaller than that of a human finger. According to this, for example, an operator of the electronic device 3 arranged in the server rack 10 is prevented from touching the evaporator 21 through the hole 68, and an accident such as a finger being injured by the fins of the evaporator 21 is prevented. Can be prevented.

On the inner surface of the rear door 12, as shown in FIG. 6, an evaporator 21 disposed in substantially the entire area of the rear door 12, and expansion valves 28 </ b> A and 28 </ b> B provided in liquid branch pipes 27 </ b> A and 27 </ b> B of the evaporator 21 The electric unit 51 for controlling the opening degree of the expansion valves 28A and 28B 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 an integrated electronic device cooling unit 20. By connecting the unit 20 to the heat source device 30, the heat generated by the electronic device 3 can be easily cooled.
As shown in FIGS. 6 and 7, the evaporator 21 is divided into an upper evaporating unit 22 and a lower evaporating unit 23 with a substantially middle portion between the upper and lower sides as a boundary. Each of the upper evaporation section 22 and the lower evaporation section 23 includes small-diameter liquid branch pipes 27A and 27B and a large-diameter gas pipe 29. The liquid branch pipes 27A and 27B and the gas pipe 29 are connected to the rear door 12. They are arranged together on the hinge 66 side. In this configuration, as shown in FIG. 6, the gas pipe 29 is disposed closer to the hinge 66 of the rear door 12 than the liquid pipe 27 (liquid branch pipes 27 </ b> A and 27 </ b> B). For this reason, the large-diameter flexible gas pipe 26 connected to the gas pipe connecting portion POUT of the gas pipe 29 is disposed at a position closer to the hinge 66, so that when the rear door 12 is opened and closed, the amount of flexure of the flexible gas pipe 26 is increased. The rear door 12 can be smoothly opened and closed with a small force.
As shown in FIG. 7, the evaporator 21 is a fin-tube type heat exchanger configured to include a refrigerant pipe 70 through which a refrigerant flows and a plurality of heat radiation fins 71 arranged in layers on the refrigerant pipe 70. The tube plates 72 for holding the fins 71 are disposed at both ends of the evaporator 21. When the evaporator 21 is disposed on the rear door 12 (see FIG. 6), the tube sheet 72 is provided with a mounting portion 72A extending substantially parallel to the rear door 12 on the rear door 12 side, and is formed in a substantially L shape. Yes. In the present embodiment, the evaporator 21 is fixed in the rear door 12 by being screwed to the rear door 12 using the mounting portion 72A.

  As shown in FIG. 6, the electrical unit 51 is disposed in a lower region of the evaporator 21. According to this, since a part of the air cooled by the evaporator 21 descends to cool the electrical unit 51, it is not necessary to provide a cooling device in the electrical unit 51 itself. Further, since the electrical unit 51 is disposed below the evaporator 21, the internal / external communication line 62 (see FIG. 3) that connects the electrical unit 51 and the electrical unit 61 (see FIG. 3) of the heat source unit 30 is connected to the flexible pipe 25. , 26, and through the opening hole 2C, the inside and outside communication lines 62 can be shortened in the underfloor space between the upper floor 2A and the lower floor 2B. For this reason, this internal / external communication line 62 is prevented from picking up noise, and the expansion valves 28A and 28B connected to the electronic device cooling unit 20, that is, the evaporator 21, can be stably operated.

In the present embodiment, as shown in FIGS. 5 and 6, a cover member 74 having a hole 73 having a predetermined diameter is formed on the inner surface of the rear door 12 so as to cover the evaporator 21. . 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 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 is a dharma hole so that the cover material 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 handle 75 is attached to the substantially central edge of the cover member 74 in the height direction, and does not hinder ventilation.
Further, as shown in FIG. 5, the cover member 74 has an opening 76 at a position corresponding to the expansion valves 28 </ b> A and 28 </ b> B when the cover member 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 is confirmed, or the coil portion of the expansion valves 28A and 28B. Is defective, the coil portion can be exchanged through the opening 76.

By the way, as shown in FIGS. 5 and 6, a drain pan 77 that receives drain water flowing down from the evaporator 21 is provided below the evaporator 21. As shown in FIG. 8, the drain pan 77 is located above the electrical unit 51 and prevents the drain water from falling on the electrical unit 51.
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 electrical unit 61 controls the operation of the compressor 32 so as not to cause 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.
As shown in FIGS. 8 and 9, the drain pan 77 includes a main body portion 77 </ b> A located below the evaporator 21, and an extension portion 77 </ b> B extending to the main body portion 77 </ b> A and extending to the hinge 66 side of the rear door 12. The extending portion 77B is formed wider in the thickness direction of the rear door 12 than the main body portion 77A. As shown in FIG. 8, the extending portion 77B has a small-diameter liquid pipe through-hole portion 78 through which the liquid pipe 27 penetrates and a large-diameter gas pipe through-hole portion 79 through which the gas pipe 29 penetrates. Is formed. Each of the holes 78 and 79 includes banks 78A and 79A formed in a cylindrical shape around the holes, and the heights of the banks 78A and 79A are set to be substantially the same as the drain pan 77.

As shown in FIG. 9, the gas pipe through-hole portion 79 is formed in the vicinity of the corner portion on the side close to the hinge 66 of the rear door 12 in the extension portion 77 </ b> B. According to this configuration, since the distance X between the gas pipe 29 penetrating the gas pipe through hole 79 and the hinge 66 can be shortened, the large-diameter flexible gas connected to the gas pipe connection portion POUT of the gas pipe 29 is provided. The tube 26 can also be arranged closer to the hinge 66. For this reason, when the rear door 12 is opened and closed, the amount of flexure of the flexible gas pipe 26 can be kept small, and the rear door 12 can be opened and closed smoothly.
Further, the liquid pipe through-hole portion 78 is formed at a position where the distance from the hinge 66 is made as short as possible without overlapping the gas pipe through-hole portion 79 when facing the rear door 12. Specifically, it is formed at a position approaching the evaporator 21 and the rear door 12 from the gas pipe through hole 79. According to this, since the liquid pipe 27 that has passed through the liquid pipe through-hole portion 78 is positioned almost directly below the liquid pipe through-hole portion 78, the liquid pipe connecting portion PIN of the liquid pipe 27 (see FIG. 7). When connecting the flexible liquid pipe 25 to the gas pipe 29, the gas pipe 29 penetrating the gas pipe through hole 79 does not get in the way, and the pipe connection work can be easily performed. Furthermore, since the liquid pipe 27 is also arranged as close as possible to the hinge 66, the small-diameter flexible liquid pipe 25 connected to the liquid pipe connecting portion PIN of the liquid pipe 27 can also be arranged closer to the hinge 66. it can. For this reason, when the rear door 12 is opened and closed, the flexible liquid pipe 25 is bent and does not prevent the rear door 12 from being opened and closed.

  As shown in FIG. 10, a hose connection port 81 to which a drain hose 80 for discharging drain water accumulated in the drain pan 77 is connected is formed on the bottom surface of the extending portion 77 </ b> B of the drain pan 77. The hose connection port 81 is formed side by side in the holes 78 and 79, and the drain hose 80 connected to the hose connection port 81 is connected to the upper floor 2A through the opening hole 2C together with the flexible pipes 25 and 26. It extends into the underfloor space between the lower floor 2B and is discharged into a side groove (not shown) formed in advance in the underfloor space. This side groove is formed below the position where the main refrigerant pipe 31 extending from the heat source unit 30, the inside / outside communication line 62, and the like are arranged, so that the water flowing through this side groove does not overflow on the lower floor 2B.

Further, in this configuration, as shown in FIG. 8, the extending portion 77 </ b> B of the drain pan 77 is provided with a float switch 82 that detects that the drain water accumulated in the drain pan 77 has reached a predetermined amount or more. . The float switch 82 has a height position that changes according to the water level. In this configuration, a plurality (two) of the float switches 82 are arranged so as to operate at the same height.
Each of these float switches 82 and 82 is attached to a bracket 83 screwed to the extending portion 77B, and each of the float switches 82 and 82 is connected in series to the electrical unit 51 described above. According to this, when one of the float switches 82 operates, a detection signal is transmitted to the electrical unit 61 of the heat source unit 30 via the electrical unit 51, and the electrical unit 61 forcibly stops the operation of the compressor 32. It is like that. For this reason, it is prevented that more drain water accumulates on the drain pan 77, and a situation in which this drain water overflows from the drain pan 77 is prevented.
Further, in this configuration, since the float switches 82 and 82 are connected in series, for example, even when one of the float switches 82 is malfunctioning due to dust biting or the like, the other float switch 82 compresses it. The operation of the machine 32 can be stopped. For this reason, it is possible to minimize the occurrence of a situation in which drain water overflows due to the malfunction of the float switch 82.

Further, in this configuration, as shown in FIG. 10, the extending portion 77 </ b> B of the drain pan 77 is formed with a notch portion 84 in which a part of the wall surface of the extending portion 77 </ b> B is cut out lower than the other wall surfaces. ing. As shown in FIG. 8, the notch 84 is formed in the wall 77 </ b> B <b> 1 that is farthest from the electrical unit 51 among the wall surfaces of the extension 77 </ b> B of the drain pan 77. The notch 84 is used to discharge the drain water to the outside of the drain pan 77 through the notch 84 when a predetermined amount or more of drain water is accumulated in the drain pan 77 due to the malfunction of the float switch 82 described above. belongs to.
Since the notch 84 is formed in the wall 77B1 farthest from the electrical unit 51 as described above, even if a situation occurs in which water overflows from the drain pan 77, the notch Since the water overflowing through 84 flows into the opening hole 2C formed in the upper floor 2A through the liquid pipe 27, the gas pipe 29, the drain hose 80, and the like, this water can be prevented from being applied to the electrical unit 51.

  According to the present embodiment, the cabinet 11 having front and rear openings for housing the plurality of electronic devices 3 with the fans 4 is provided, and the rear opening 65 of the cabinet 11 is provided with the rear door 12 that can be ventilated. Includes an evaporator 21 that constitutes a refrigeration cycle, and a thin flexible liquid pipe 25 and a large flexible gas pipe 26 connected to the evaporator 21 are connected to the rear door 12 more than the flexible liquid pipe 25. Since the rear door 12 is opened and closed, the amount of flexure of the large-diameter flexible gas pipe 26 can be kept small, and the rear door 12 can be smoothly moved with a small force. Can be opened and closed.

  In addition, according to the present embodiment, the main liquid pipe 31A and the main gas pipe 31B are disposed in the double floor space, and the flexible liquid pipe 25 and the flexible gas connected to the main liquid pipe 31A and the main gas pipe 31B. Since the pipe 26 is connected to the evaporator 21 disposed in the rear door 12 through the opening hole 2C formed in the upper floor 2A, the main liquid pipe 31A, the main gas pipe 31B, the flexible liquid pipe 25, and the flexible gas pipe 26 are connected to each other. It does not exist on the upper floor 2 </ b> A of the computer room 2, and does not get in the way for workers who move in the computer room 2.

As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, in the present embodiment, the case where the evaporator 21 is divided into the upper evaporation unit 22 and the lower evaporation unit 23 has been described. However, the present invention is not limited to this, and may be divided into three or more. It is good also as composition to do. Specifically, if the partition plate 11E in the cabinet 11 has a three-stage configuration, the evaporator is divided into three in the vertical direction with these partition plates 11E as a boundary, and the partition plate 11E in the cabinet 11 has six stages. In this configuration, the evaporator 21 is divided into six parts in the vertical direction with the partition plate 11E as a boundary, and an expansion valve is connected to each of the plurality of divided evaporators to provide refrigerant corresponding to the number of stages of the partition plate 11E. It is good also as a structure which performs flow control.
In the above-described embodiment, the configuration in which the evaporator 21 is divided into the upper evaporation unit 22 and the lower evaporation unit 23 with the partition plate 11E that divides the inside of the cabinet 11 into two parts up and down is described. The upper evaporator 22 and the lower evaporator 23 may be further divided into a plurality of evaporators, and an expansion valve may be connected to each of the evaporators. According to this configuration, it is possible to perform finer refrigerant flow control in accordance with the operating state of the electronic device 3 housed in the cabinet 11, and to reduce energy consumption in the heat source unit 30. Can do.
Furthermore, in the said embodiment, since the electronic device 3 accommodated in the cabinet 11 was horizontally long, the structure which arrange | positions the partition plate 11E horizontally and divides | segments the inside of the cabinet 11 to the up-down direction was demonstrated, for example, When a vertically long electronic device (not shown) is housed in a cabinet, the partition plate may be arranged vertically and the inside of the cabinet may be divided in the left-right direction. In this case, it is desirable that the evaporator is divided in the left-right direction with a partition plate arranged vertically.

Moreover, although this embodiment demonstrated the case where the air-cooling type heat source device 30 was used, it is not restricted to this, You may use the water-cooling type heat source device 30X as shown in FIG. When the water-cooled heat source unit 30X is used, since the heat source unit 30X is connected to the water pipes 101 and 102 extending from a cooling tower (not shown), a plurality of heat source units 30X can be arranged to overlap each other. 30X placement space is reduced. Moreover, it is good also as a structure which connects an air conditioning apparatus to the main refrigerant | coolant piping 31 extended from the heat source machines 30 and 30X, and air-conditions in the computer room 2 with this air conditioning apparatus.
Further, the heat source devices 30 and 30X described above may be configured as a dedicated cooling (cooling) cycle machine that does not have the four-way valve 34. The compressor 32 included in the heat source units 30 and 30X 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 is compressed by driving a gas engine. It may be a GHP (gas heat pump) type heat source machine that drives the machine.
In the present embodiment, the rear door 12 included in the server rack 10 is a single door, but the present invention is not limited thereto, and a double door may be used. According to this configuration, for example, even if the width of the cabinet is increased as the width of the electronic device is increased, the movable range of the door can be reduced as compared with the case of single opening, so that the maintenance work can be performed. Can be easily performed.

It is a figure which shows the electronic device cooling system which concerns on one Embodiment of this invention. It is a figure which shows a server rack. It is a figure which shows the circuit structure of an electronic device cooling device. It is an external appearance perspective 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 from FIG. It is a perspective view which shows the structure of an evaporator. It is a perspective view which shows the structure of a drain pan. It is a top view of a drain pan. It is a perspective view of a drain pan. It is a figure which shows the electronic device cooling system using a water-cooling type heat source machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device cooling system 2 Computer room 2A Upper floor 2B Lower floor 2C Opening hole 3 Electronic device 4 Fan 10 Server rack 11 Cabinet 12 Rear door 20 Electronic device cooling unit 21 Evaporator 25 Flexible liquid pipe (liquid pipe)
26 Flexible gas pipe (gas pipe)
28A, 28B Expansion valve 30 Heat source machine 30X Heat source machine 31A Main liquid pipe 31B Main gas pipe 51 Electrical unit (Electrical box)
62 Internal / External Communication Line 64 Front Opening 65 Rear Opening 66 Hinge 74 Cover Material 77 Drain Pan 77A Main Body 77B Extension Portion 78 Liquid Pipe Through Hole 79 Gas Pipe Through Hole

Claims (3)

A cabinet with front and rear openings for storing multiple electronic devices with fans,
The rear opening of the cabinet has a rear door that allows ventilation,
The rear door includes an evaporator constituting a refrigeration cycle,
The small-diameter liquid pipe and the large-diameter gas pipe connected to the evaporator are arranged close to the hinge side of the rear door closer to the hinge side of the rear door than the liquid pipe,
An electronic device cooling system, wherein air blown by the fan is cooled by an evaporator of the rear door and returned to the room.   The liquid pipe and the gas pipe are a flexible liquid pipe and a flexible gas pipe respectively connected to a main liquid pipe and a main gas pipe extending from a heat source unit having a compressor and a condenser. The electronic device cooling system described.   The cabinet is installed on a double floor having an upper floor disposed with a space above the lower floor, and includes the main liquid pipe and the main gas pipe in the space. The flexible liquid pipe and the flexible gas pipe connected to a gas pipe are connected to the evaporator disposed in a rear door of the cabinet through an opening formed in the upper floor. Electronic equipment cooling system.

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