JP2009134532A - Electronic equipment cooling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic equipment cooling apparatus for effectively cooling electronic equipment without using water. <P>SOLUTION: A cabinet 11 for housing the electronic equipment 3 includes front and rear openings, and a rear door 12 for closing the rear opening 65 in such a manner as to prevent circulation of air is provided at the rear opening 65. A refrigerant evaporator 21 that forms a refrigeration cycle is positioned at an opening provided in the upper or lower surface of the cabinet 11. A fan 15 of the evaporator 21 sucks in indoor air from the front of the cabinet 11. The air warmed by the exhaust heat of the electronic equipment 3 is cooled by the evaporator 21, blown out either upwards or downwards and returned indoors. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device cooling apparatus for cooling air blown by a fan attached to an electronic device housed in a cabinet.

In general, 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 housed in the cabinet is used as the air-water heat exchanger. There is known an electronic device cooling system that cools and returns to the room (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, since electronic devices are vulnerable to water, it is desirable not to bring water into the computer room. However, since the air-water heat exchanger is disposed in the vicinity of the electronic device in the conventional device, if water leaks even from a part of the path through which the chiller water circulates in the air-water heat exchanger. This water may damage the electronic equipment.
Then, the objective of this invention is providing the electronic device cooling device which can cool an electronic device effectively, without using water.

In order to solve the above-described problems, the present invention provides a cabinet for storing an electronic device having front and rear openings, and the rear opening has a lid that closes the opening so as not to allow ventilation. The refrigerant evaporator constituting the refrigeration cycle is arranged in the provided opening, and the air blown into the room is sucked from the front of the cabinet by the blower fan of the evaporator, and the air heated by the exhaust heat of the electronic device is It is characterized in that it is cooled by a vessel and returned to the room by an upper blowing or a lower blowing.
According to the above configuration, the air heated by the exhaust heat of the electronic device is cooled by the evaporator and returned to the room by the upper blowing or the lower blowing, so that the electronic device can be effectively cooled.
In this configuration, the evaporator may be disposed in the opening on the upper surface of the cabinet, the blower fan may be disposed above the evaporator, and the blower fan may be covered with a fan guard.
Further, the evaporator may be disposed in the opening on the lower surface of the cabinet, the blower fan may be disposed below the evaporator, and the blower fan may be covered with a fan guard.

  According to the present invention, an electronic device can be effectively cooled without using water.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[1] First Embodiment FIG. 1 is a diagram showing an electronic device cooling system according to a first 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 an explanatory diagram of the server rack.
FIG. 3 is an external perspective view of the server rack as viewed from the rear side.
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 to open and close the rear surface opening 65 so that the rear surface opening 65 can be closed. Further, an electronic device cooling unit 20 is disposed on the upper surface of the cabinet 11. Furthermore, 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. In general, this type of electronic device is a fan-equipped electronic device provided with a cooling fan 4. The fan 4 is driven at all times or when the temperature in the device exceeds a predetermined temperature, and outside air is introduced into the device. It has a forced air cooling function to discharge from the back of the equipment.
In the first embodiment, the fan 4 is provided in the center of the back surface of the electronic device 3, and the rear surface opening 65 of the cabinet is blocked by the rear door 12 so as not to allow ventilation.
And the evaporator 21 which comprises the electronic device cooling unit 20 is arrange | positioned in the opening 11X of the upper surface of the cabinet 11, Furthermore, the ventilation fan 15 is arrange | positioned above the evaporator 21, and the ventilation fan 15 is covered with the fan guard 16. FIG. .
As a result, indoor air is sucked from the front surface of the cabinet 11 by the blower fan 15 of the evaporator 21, and the air heated by the exhaust heat of the electronic device 3 is cooled by the evaporator 21 and blown through the fan guard 16 by upward blowing. To return to the room.
As a result, by disposing the electronic device 3 with the rear surface thereof facing the rear opening 65 of the rear surface of the cabinet 11, the fan 4 attached to the electronic device 3 and the flow of the cooling air are shown in FIG. The indoor air sucked from the front opening of the cabinet 11 by the blower fan 15 cools the electronic device 3 and is discharged from the outlet 4A on the back surface of the electronic device 3. Then, the temperature rises by cooling the electronic device 3, and the air discharged from the outlet 4 </ b> A on the back surface of the electronic device 3 passes through the evaporator 21, the blower fan 15 and the fan guard 16 and rises from the upper surface of the cabinet 11. Return to the room by blowing.

  The cabinet 11 has a size that matches the standard of the electronic equipment 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 the side plates 11C and 11D, and a plurality of the 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 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 to pull the handle 67 forward, the rear door 12 rotates about the hinge 66 as shown in FIG. 4 and the rear opening 65 of the cabinet 11 is opened.

  The electronic device cooling unit 20 is configured integrally with the cabinet 11 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 as shown in FIG. 2, the temperature rises by cooling the electronic device 3, The air discharged from the air outlet 4A on the back surface of the electronic device 3 rises through the exhaust passage formed between the rear door 12 and each electronic device 3, and passes through the evaporator 21, the blower fan 15, and the fan guard 16. And return to the room.
In this configuration, since the refrigerant circulating 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 refrigerant immediately It can evaporate and prevent damage such as a short circuit or electric leakage of the electronic device 3.

In addition, as shown in FIG. 2, a drain pan 77 that receives drain water flowing down from the evaporator 21 is provided below the evaporator 21. The drain pan 77 prevents the drain water from falling into 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. A separate air conditioner electrical unit controls the operation of the compressor to prevent condensation.
Therefore, although it is not assumed that drain water accumulates 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 not stored in the computer room 2. It does not fall into the room.

FIG. 4 is an explanatory diagram of a circuit configuration of the electronic device cooling apparatus.
As shown in FIG. 4, the electronic device cooling unit 20 is connected 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. Connected in parallel. 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 a liquid pipe connection portion (not shown) of the electronic device cooling unit 20. The refrigerant pipe (liquid pipe) 27 extending from the liquid pipe connection portion PIN branches into two, and one liquid branch pipe 27A is connected to the inlet of the first evaporator 22 through the expansion valve 28A, and the other liquid branch. The pipe 27B is connected to the inlet of the second 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 a flexible gas pipe 26 is connected to a gas pipe connecting portion (not shown) provided at the end of the merging refrigerant pipe 29. The 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 liquid pipe can be used even when the cabinet 11 holding the evaporator 21 is moved. 25 and 26 bend and do not hinder their movement. Therefore, 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 held in the cabinet 11 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 drawn so as to bend gently in the underfloor space. By giving a margin to the length, only the flexible liquid pipes 25 and 26 move in accordance with the movement of the cabinet 11 when the cabinet 11, and by extension, the server rack 10 is moved. Accordingly, when the server rack 10 is moved, no force acts on other pipes such as the main liquid pipe 31A and the main gas pipe 31B. For example, a steel pipe is used for the main liquid pipe 31A and the main gas pipe 31B which are other pipes. It is possible to apply.

  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 four temperature sensors (refrigerant temperature detection means) that convert an inlet refrigerant temperature L1 and an outlet refrigerant temperature G1 of the first evaporator 22 and an inlet refrigerant temperature L2 and an outlet refrigerant temperature G2 of the second evaporator 23. ) Control through the respective expansion valves 28A and 28B so as to obtain an appropriate superheat degree based on the temperature difference (L1-G1, L2-G2) between the outlets and the outlets of the evaporators 22 and 23. And a function of communicating with the heat source device 30.

  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 this 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 an 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 on / off operation and the operation frequency of the compressor 32B are controlled, the inlet / outlet temperature of the heat source side heat exchanger 35 is detected by a temperature sensor (not shown), and the expansion valve 36 is opened so that the inlet / outlet temperature difference falls within an appropriate range. Control the degree.
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 through the liquid pipe 27, where it is divided into two systems, one of which passes through the expansion valve 28A and the first evaporation. The other part flows through the expansion valve 28B and the second evaporation part 23, evaporates and gasifies in each of the evaporation parts 22 and 23, and each evaporation part is heated by the refrigerant evaporation heat in each of the evaporation parts 22 and 23. Air passing through 22 and 23 is cooled.
Then, the refrigerant gasified in each of the evaporation units 22 and 23 merges in the merged refrigerant 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.

  As shown in FIG. 4, 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. 5) that connects the electrical unit 51 and the electrical unit 61 (see FIG. 5) of the heat source unit 30 is a flexible liquid pipe. 25, 26 and the opening hole 2C through the underfloor space between the upper floor 2A and the lower floor 2B, the length of the internal / external communication line 62 can be shortened. 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.

According to the first embodiment, the rear door is provided with the cabinet 11 having front and rear surfaces opened to accommodate the plurality of electronic devices 3 with the fans 4, and the rear surface opening 65 closes the rear surface opening 65 so as not to allow ventilation. (Cover) 12 is provided, and a refrigerant evaporator 21 constituting a refrigeration cycle is arranged in an opening 11X provided on the upper surface of the cabinet, and air inside the room is blown from the front of the cabinet 11 by the blower fan 15 of the evaporator 21. The air that has been sucked in and heated by the exhaust heat of the electronic device 3 is cooled by the evaporator 21 and returned to the room by blowing upward through the fan guard 16, so that the heat generated by the electronic device 3 can be easily cooled. .
Moreover, since the refrigerant | coolant which circulates through a refrigerating cycle is supplied to the evaporator 21, even if a leak arises from the path | route through which a refrigerant | coolant circulates, damage, such as short circuit or electric leakage of the electronic device 3, is prevented with this refrigerant. be able to. Furthermore, since the air blown by the fan 4 is cooled by the evaporator 21 provided in the opening 11X on the upper surface of the cabinet 11 and returned to the room by the upper blowing, the room temperature excessively rises due to the heat generated by the electronic device 3. The occurrence of temperature distribution in the room is prevented. Therefore, according to the first embodiment, the electronic device 3 can be effectively cooled without using water.

[2] Second Embodiment In the first embodiment described above, the evaporator 21 is disposed in the opening 11X provided on the upper surface of the cabinet and is returned to the room by the upper blowout. However, in the second embodiment, The evaporator 21 is disposed in an opening provided on the lower surface of the cabinet, and is configured to be returned to the room by a downward blowing.

FIG. 5 is an explanatory diagram of a server rack according to the second embodiment.
FIG. 6 is an external perspective view of the server rack according to the second embodiment when viewed from the rear side.
5 and 6, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals.
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 to open and close the rear surface opening 65 so that the rear surface opening 65 can be closed. Furthermore, an electronic device cooling unit 20 </ b> A is disposed on the lower surface of the cabinet 11. Furthermore, a caster 13 is provided at the bottom of the server rack 10 so that the server rack 10 can be easily moved.
Also in the second embodiment, the fan 4 is provided at the center of the back surface of the electronic device 3, and the rear opening 65 of the cabinet is blocked by the rear door 12 so as not to allow ventilation.

And the evaporator 21 which comprises the electronic device cooling unit 20 is arrange | positioned in the opening 11XA of the lower surface of the cabinet 11, Furthermore, the ventilation fan 15A is arrange | positioned under the evaporator 21, and the ventilation fan 15A is covered with the fan guard 16. FIG. .
Thereby, indoor air is sucked from the front surface of the cabinet 11 by the blower fan 15A of the evaporator 21, and the air heated by the exhaust heat of the electronic device 3 is cooled by the evaporator 21 and blown down through the fan guard 16A. The interior of the cabinet 11 is returned to the room.
In this case, the blowing capacity of the blower fan 15A needs to be exhausted against the rising airflow of the warmed air as compared with the case where the blower fan 15A is provided above the cabinet 11 as in the blower fan 15 of the first embodiment. Therefore, it is necessary to set large.

  As a result, by disposing the electronic device 3 with the rear surface thereof facing the rear opening 65 of the rear surface of the cabinet 11, the fan 4 attached to the electronic device 3 as shown in FIG. The indoor air sucked from the front opening of the cabinet 11 by the blower fan 15 </ b> A cools the electronic device 3, is discharged from the outlet 4 </ b> A on the back surface of the electronic device 3, and cools the electronic device 3. Then, the temperature rises by cooling the electronic device 3, and the air discharged from the outlet 4A on the back surface of the electronic device 3 passes through the evaporator 21, the blower fan 15A, and the fan guard 16A, and passes from the lower surface of the cabinet. Since it returns to the room by the downward blowing, it is possible to prevent the room temperature from excessively rising due to the heat generated by the electronic device 3 and the occurrence of temperature distribution in the room. Therefore, according to the second embodiment, the electronic device 3 can be effectively cooled without using water.

[3] Modifications of Embodiments While the present invention has been described based on each embodiment, the present invention is not limited to this.
For example, in the above description, indoor air is sucked from the front of the cabinet by the blower fan of the evaporator, and the air heated by the exhaust heat of the electronic device is cooled by the evaporator and blown up or blown down. Although it was configured to return to the room, in this modification, when the evaporator is disposed in the cabinet, the evaporator is disposed at a position facing the opening provided on the side surface of the cabinet, and is returned to the room by blowing from the side of the cabinet. It is a thing when taking.

FIG. 7 is an explanatory diagram of a modified server rack.
FIG. 8 is an external perspective view of the server rack of the modified example of FIG. 7 when viewed from the rear side.
7 and 8, the same reference numerals are given to the same parts as those in FIGS. 2 and 3.
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. A rear door 12 is provided on the rear surface of the cabinet 11 to open and close the rear surface opening 65 so that the rear surface opening 65 can be closed. Furthermore, an electronic device cooling unit 20 </ b> A is disposed on the lower surface of the cabinet 11. Furthermore, a caster 13 is provided at the bottom of the server rack 10 so that the server rack 10 can be easily moved.

Also in this modification, the fan 4 is provided on the back surface of the electronic device 3, and the cabinet rear surface opening 65 is closed by the rear door 12 so as not to allow ventilation.
And in the case of FIG. 8, when arrange | positioning the evaporator 21 in the cabinet 11, the evaporator 21 is arrange | positioned in the position which opposes the opening 11XB provided in the side plate 11C, and also evaporates. A plurality of blower fans 15B are arranged on the near side of FIG.
Further, a hole 68 having a predetermined diameter is formed on substantially one surface in the opening 11XB, and a surface material 69 functioning as a fan guard is disposed. The surface material 69 allows the side plate 11C to pass through the holes 68 and functions so as not to expose the blower fan 15B to the outside, thereby improving the aesthetics of the server rack 10.

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 blower fan 15B through the hole 68, and an accident such as a finger injury by the tank fan 15B is prevented. be able to.
As a result, the indoor fan is sucked from the front surface of the cabinet 11 by the blower fan 15B of the evaporator 21, and the air heated by the exhaust heat of the electronic device 3 is cooled by the evaporator 21 and functions as a fan guard by blowing downward. It returns to the room from the side surface of the cabinet 11 through a hole 68 provided in the surface material 69.

As a result, by disposing the electronic device 3 with the rear surface thereof facing the rear opening 65 of the rear surface of the cabinet 11, the fan 4 attached to the electronic device 3 and the flow of the cooling air are indicated by broken line arrows in FIG. The indoor air sucked from the front opening of the cabinet 11 by the blower fan 15B cools the electronic device 3 and is discharged from the outlet 4A on the back surface of the electronic device 3 to cool the electronic device 3. The temperature rises by cooling the electronic device 3, and the air discharged from the outlet 4 </ b> A on the back of the electronic device 3 passes through the evaporator 21, the blower fan 15 </ b> B, and the surface material 69 that functions as a fan guard. Since it returns to the room from the side surface of the cabinet 11, it is possible to prevent the room temperature from excessively rising due to the heat generated by the electronic device 3 and the occurrence of temperature distribution in the room. Therefore, also according to this modification, the electronic device 3 can be effectively cooled without using water.
In the description of the above modification, the configuration in which the air cooled by the evaporator 21 is blown out from the side plate 11C side is taken, but the configuration in which the air is blown out from the side plate 11D side or the configuration in which the air is blown out from both the side plate 11C and the side plate 11D. It is also possible to do.

In the above description, the case where the evaporator 21 is divided into the first evaporator 22 and the second evaporator 23 has been described. However, the present invention is not limited to this, and the evaporator 21 may be divided into three or more. It is good also as composition to do.
Further, the first evaporator 22 and the second 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.

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 thereto, 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.
In the above description, air conditioning in the computer room 2 has not been described. However, an air conditioner is connected to a main refrigerant pipe extending from an air-cooled or water-cooled heat source unit, and the air conditioner in the computer room 2 is connected by this air conditioner. It is good also as composition which performs.
Moreover, as a heat source machine mentioned above, it is good also as a structure of a cooling (cooling) cycle exclusive machine which does not have a four-way valve.
Further, the compressor provided in the heat source device is of a type driven by an electric motor, that is, a so-called EHP (electric heat pump) type, but is not limited to this, and the compressor is driven by driving a gas engine. It is good also as a heat source machine of a GHP (gas heat pump) type.
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 1st Embodiment of this invention. It is explanatory drawing of the server rack of 1st Embodiment. It is an external appearance perspective view at the time of seeing the server rack of 1st Embodiment from the rear surface side. It is a figure which shows the circuit structure of an electronic device cooling device. It is explanatory drawing of the server rack of 2nd Embodiment. It is an external appearance perspective view at the time of seeing the server rack of 2nd Embodiment from the rear surface side. It is explanatory drawing of the server rack of a modification. It is an external appearance perspective view at the time of seeing the server rack of the modification of FIG. 7 from the rear surface side.

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 4A Outlet 10 Server rack 11 Cabinet 11A Top plate 11B Bottom plate 11C Side plate 11C Both sides plate 11E Plate 11X Open 11XA Open 11XB Open 12 Rear door 13 Casters 15, 15A, 15B Blower fan 16, 16A Fan guard 20, 20A Electronic equipment cooling unit 21 Evaporator 22 First evaporator 23 Second evaporator 25 Flexible liquid pipe 26 Flexible gas pipe 27 Liquid pipe 27A, 27B Liquid branch pipe 28A, 28B Expansion valve 29 Combined refrigerant pipe 30 Heat source machine 31 Main refrigerant pipe 31A Main liquid pipe 31B Main gas pipe 32, 32A, 32B Compressor 33 Oil separator 34 Four-way valve 35 Heat source side heat exchanger 36 Expansion 37 Receiver tank 38 Accumulator 40 Electronic equipment cooling device 41 Low pressure side piping 42 High pressure side piping 42A, 43, 44 Check valve 46 Open / close valve 47 Liquid side service valve 48 Gas side service valve 51 Electrical unit 52 Remote controller 61 Electrical unit 62 Inside / outside Communication line 64 Front opening 65 Rear opening 66 Hinge 67 Handle 68 Hole 69 Surface material 77 Drain pan

Claims (3)

  A cabinet for storing electronic equipment has front and rear openings, and a rear opening is provided with a lid that closes the opening so as not to allow ventilation, and an opening provided on the upper surface or the lower surface of the cabinet is used to form a refrigeration cycle. An evaporator is arranged, indoor air is sucked in from the front of the cabinet by a blower fan of the evaporator, and the air heated by exhaust heat of the electronic device is cooled by the evaporator and blown up or blown down. An electronic device cooling device characterized in that it is configured to be returned to the room by the above.   The electronic device cooling according to claim 1, wherein the evaporator is disposed in an opening on an upper surface of the cabinet, the blower fan is disposed above the evaporator, and the blower fan is covered with a fan guard. apparatus.   The electronic device cooling according to claim 1, wherein the evaporator is disposed in an opening on a lower surface of the cabinet, the blower fan is disposed below the evaporator, and the blower fan is covered with a fan guard. apparatus.

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