JP2013037665A - Air conditioning system for server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively perform air conditioning in a server room and a server rack by preventing exhaust air after heat exchange from being discharged into the server room, and to provide an air conditioning system for a server system capable of reducing cost required to construct a building by saving useless space.SOLUTION: A ceiling L is provided with a feeding passage 11 for feeding conditioning air and a feedback passage 12 for returning exhaust air to an air conditioner 10. A duct structure for connecting a server rack 1 and the feedback passage 12 includes a duct base 17 fixed to the server rack 1, a duct part 18 connected to the duct base 17, and a fan unit 19 arranged inside the duct base 17. Servers S1 and S2 mounted on the server rack 1 make an exhaust air opening 5 provided on the rear thereof face exhaust air passages 6 and 7 inside the server rack 1. The fan unit 19 forcedly feeds exhaust air discharged to the exhaust air passages 6 and 7 to the feedback passage 12 through the duct base 17 and the duct part 18.

Description

  The present invention relates to an air conditioning system for performing air conditioning in a server rack in a server system.

  In this type of air conditioning system, there are known a form in which cool air for air conditioning is supplied from under the floor and a form in which it is supplied from the back of the ceiling. The air conditioning system of the former form can be seen in, for example, Patent Document 1, where the floor of the server room is a double floor structure with an upper floor and a lower floor, and a unit type air conditioner is installed in the double floor space is doing. The upper floor is composed of grating, and the cold air after heat exchange with the unit type air conditioner can be blown out from the upper floor to the server room. The unit type air conditioner is arranged facing the upper floor sandwiched between the four server racks arranged opposite to each other, and the cold air supplied from the unit type air conditioner is taken into each server rack and is stored in the server. After depriving of heat, it is discharged to the ceiling and becomes hot aisle. The hot aisle is returned to the double bed space again via a circulation path. In addition, the height of the double-floor space is over 2m in order to avoid the hassle of entering the server room with strict entry / exit management and to maintain the unit type air conditioner. A battery unit for backup power can be arranged.

  An air conditioning system of the latter form can be seen, for example, in Patent Document 2, in which a cold air supply chamber (duct) is arranged in the ceiling, and an air conditioner provided on the ceiling of the server room is used to remove hot air in the server room. It cools and blows out into the cold air supply chamber. The cool air in the cool air supply chamber is fed into the rack through a duct provided in the server rack, taken into the server by a fan action of a fan built in each server, cooled, and then cooled from the back of the server rack. Discharged. Therefore, a cool air passage is secured between the front panel of the server rack and the server. Thus, when the cool air in the cool air supply chamber is supplied to the server rack via the duct, the cool air can be reliably introduced into the server rack, and the server can be efficiently cooled while preventing a short circuit of the cool air.

Japanese Patent Laying-Open No. 2011-80670 (paragraph number 0017, FIG. 1) JP 2011-81528 A (paragraph number 0036, FIG. 3)

  In the air conditioning system of Patent Document 1, the floor of the server room has a double floor structure, a unit type air conditioner is installed in the floor, and cool air is blown out from the upper floor composed of grating to the server room. Therefore, although the server can be cooled together with the server room, since it is necessary to provide an upper floor separately from the lower floor, the structure of the building becomes complicated and the cost increases. In addition, since the height of the double floor space that accommodates the unit type air conditioner is set to a little over 2 m, and the worker can enter the double floor space, the total height of the server room and the double floor space is When the same number of server racks are laid out on the floor of the same area in the same arrangement pattern, the height of the building becomes about twice as large and the cost required for the construction increases.

  In that respect, in the air conditioning system of Patent Document 2, a cold air supply chamber is disposed in the ceiling, and the cold air in the cold air supply chamber is fed into the server rack through the duct, so that the height of the server room is increased. Can be eliminated. In addition, there is an advantage that the cool air can be surely introduced into the server rack while preventing a short circuit of the cool air. However, since the hot air after cooling the server is discharged from the back of the server rack to the server room, it is inevitable that the discharged hot air fills the server room. In order to prevent the temperature rise in the server room, it is preferable to provide more air conditioners on the ceiling wall, but this increases the overall cost of the air conditioning system. In addition, since a duct communicating with the cold air supply chamber is provided on the upper end wall of the server rack, it is difficult to cool all the servers accommodated in the server rack in a multistage manner without temperature unevenness. The server housed in the lower half of the server cannot be cooled effectively.

  Servers include a half server that is mounted back-to-back from the front and back of the server rack, and a full server that is mounted only from the front of the server rack. In the latter server mounting structure, hot air is released using the space between the rear surface of the full server and the rear wall of the server rack, but in the former, the hot air can only be released using the central space facing the half server. . Therefore, in the half server, when supplying cool air to the server rack via the duct as in the air conditioning system of Patent Document 2, it is necessary to secure a cool air passage on each of the front and rear surfaces of the server rack. It is inevitable that the front and rear length of the server rack will increase. In other words, the number of servers installed per unit area of the floor is reduced. Furthermore, since the connection position of the duct with respect to the server rack is greatly displaced forward and backward between the server rack that accommodates the half server and the server rack that accommodates the full server, the upper end of the server rack is changed according to the difference in the server arrangement structure. Two types of top plates for closing the door must be facilitated, which increases costs.

An object of the present invention is to eliminate the release of exhaust gas after heat exchange from a server rack to a server room, and to effectively perform air conditioning in the server room and the server rack. An object of the present invention is to provide an air conditioning system for a server system that can reduce the cost required for building a building.
An object of the present invention is to provide a server system in which a half server and a full server can be accommodated in a server rack having the same structure, and equipment for air conditioning incorporated in each server rack can be made into a common component, and thus the overall cost can be reduced. It is to provide an air conditioning system.

  The air conditioning system for a server system according to the present invention returns a supply path 11 that feeds conditioned air generated by the air conditioner 10 to the interior of the ceiling L, and exhaust air after heat exchange to the air conditioner 10. A return path 12 is provided. The supply path 11 is provided with a supply port 13 for sending conditioned air to the server room. The server rack 1 installed on the floor F and the return path 12 are connected via a duct structure for feeding and guiding the exhaust gas after heat exchange to the return path 12. The duct structure includes a cylindrical duct base 17 that is fixed to the upper wall of the server rack 1, a duct portion 18 that is fixed to the upper surface of the duct base 17, and a fan unit 19 that is disposed inside the duct base 17. . The servers S1 and S2 are mounted in multiple stages with respect to the server rack 1, and the exhaust ports 5 provided on the back face the exhaust passages 6 and 7 inside the server rack 1. The exhaust gas discharged into the exhaust passages 6 and 7 is forcibly fed to the return path 12 by the fan unit 19 via the duct base 17 and the duct portion 18.

  The duct portion 18 includes a fixed duct 24 fixed to the upper surface of the duct base 17 and a movable duct 25 that is supported by the fixed duct 24 so as to be vertically slidable and communicates with the return path 12. In the upper part of the movable duct 25, there are provided a connection part 32 connected to the return port 14 of the return path 12 and a regulation wall 33 formed to protrude below the connection part 32. The movable duct 25 is inserted into the return port 14 from the server room side until the restriction wall 33 contacts the ceiling L, and the movable duct 25 is communicated with the return path 12.

  The full server S1 is mounted from the front of the server rack 1, and the exhaust port 5 of the full server S1 is made to face the rear exhaust passage 6 provided in the rear part of the server rack 1. The half server S2 is mounted from the front and rear surfaces of the server rack 1 so that the exhaust ports 5 of the front and rear half servers S2 face the central exhaust passage 7 at the front and rear center of the server rack 1. A wind guide duct 20 that connects the rear exhaust passage 6 and the central exhaust passage 7 and the duct base 17 is provided in the server rack 1. A shutter 44 is provided inside the air guide duct 20 to switch the space in the duct of the air guide duct 20 between a state communicating with the rear exhaust passage 6 and a state communicating with the central exhaust passage 7.

  A cable rack 46 that supports the power cable and the communication cable is provided on at least one of the front surface and the rear surface of the duct base 17. The cable rack 46 includes a plurality of brackets 47 engaged with the duct base 17 and a rack-shaped rack body 48 supported by the brackets 47.

  A reinforcing frame 49 is fixed to the inner surface of the upper wall of the server rack 1.

  Of the front and rear surfaces of the server rack 1, doors 2 and 3 that can be opened and closed are provided at least on the front surface. The door panels of the doors 2 and 3 are made of perforated plates.

  As shown in FIGS. 12 and 13, the duct portion 18 includes a fixed duct 24 that is fixed to the upper surface of the duct base 17, and a movable duct 25 that is supported by the fixed duct 24 so as to be vertically slidable and communicates with the return path 12. Consists of. In the upper part of the movable duct 25, there are provided a connection portion 32 connected to the return port 14 of the return path 12 and a seal body 34 that seals a gap between the return port 14 of the ceiling L and the movable duct 25. is there. The connecting portion 32 of the movable duct 25 is inserted into the return port 14 from the server room side, and the movable duct 25 is communicated with the return path 12.

  Each of the fixed duct 24 and the movable duct 25 is formed of non-combustible corrugated cardboard in which an aluminum foil is laminated on the surface of corrugated cardboard. In a state in which the movable duct 25 is fitted inside the fixed duct 24, the lift cord 84 that pushes up the movable duct 25 upwards from one of the opposing walls of the fixed duct 24 via the movable duct 25. To the other of the opposite walls (see FIG. 18). With the lower part of the fixed duct 24 fixed to the duct base 17, both ends of the lift string 84 exposed on the outer surface of the fixed duct 24 are pulled, and the movable duct 25 is moved upward from the fixed duct 24 by the lift string 84. Extrude operation.

  The fixed duct 24 and the movable duct 25 are configured by assembling duct parts 64 and 65 into a square box shape. The duct parts 64 and 65 are integrally provided with duct walls 66 and 67 and narrow joint pieces 68 that are continuous with circumferential ends of the duct walls 66 and 67. The fixed duct 24 is configured by assembling the duct parts 64 in a box shape with the joining piece 68 positioned on the outer surface of the duct. The movable duct 25 is configured by assembling the duct parts 65 in a box shape with the joining piece 68 positioned on the inner surface of the duct. Each of the overlapping end of the duct base 17 and the fixed duct 24, the overlapping end of the movable duct 25 and the fixed duct 24, and the connecting end of the joining piece 68 is sealed with a seal tape.

  The full server S1 is mounted from the front of the server rack 1, and the exhaust port 5 of the full server S1 faces the rear exhaust passage 6 provided at the rear part of the server rack 1. The half server S <b> 2 is mounted from the front and rear surfaces of the server rack 1, and the exhaust ports 5 of the front and rear half servers S <b> 2 face the central exhaust passage 7 at the front and rear center of the server rack 1. A wind guide duct 20 that connects the rear exhaust passage 6 and the central exhaust passage 7 and the duct base 17 is provided in the server rack 1. A shutter 44 for switching between a state in which the space in the duct of the air guide duct 20 communicates with the rear exhaust passage 6 and a state in which it communicates with the central exhaust passage 7 is provided inside the air guide duct 20 (see FIG. 13).

  As shown in FIG. 23, the air guide duct 20 has an isosceles trapezoidal cross section, and its lower surface opening communicates with the rear exhaust passage 6 and the central exhaust passage 7 at the same time. The shutter 44 includes a pair of quadrant-shaped side walls 86 and a partial arc-shaped guide wall 87 that connects the arc edges of both side walls 86. The shutter 44 is pivotally supported by a shutter shaft 88 mounted on the air guide duct 20 so that the posture can be switched between a posture in which the guide wall 87 closes the rear exhaust passage 6 and a posture in which the guide wall 87 closes the central exhaust passage 7. Constitute. In either one of the switching postures, a fixture 89 that fixes and holds the shutter 44 so as not to swing is provided between the shutter 44 and the air guide duct 20.

  In the present invention, the fan unit 19 is provided with the exhaust passages 6, 7 in the server rack 1, and the exhaust discharged into the exhaust passages 6, 7 through the servers S 1, S 2 is provided in the duct base 17. Thus, it can be forcibly fed to the return path 12 in the ceiling L via the duct portion 18. In this way, if the exhaust gas after heat exchange is forcibly supplied to the return path 12 in the ceiling L, it is possible to eliminate the diffusion or filling of the exhaust gas into the server room. Therefore, compared with the conventional air conditioning system which discharged | emitted the exhaust after heat exchange to the server room, the circulation form of conditioned air is optimized and the air conditioning in a server room and the server rack 1 is performed effectively. Can do. In addition, because the conditioned air is supplied using the space behind the ceiling and the exhaust gas is recovered, it is necessary to provide a wasteful space under the floor compared to the conventional air conditioning system that required a cold air supply space under the floor. Therefore, the cost required to construct the building can be reduced accordingly.

  When the duct portion 18 is configured to be extendable and contractable by a fixed duct 24 and a movable duct 25 that slides up and down with respect to the fixed duct 24, the fixed duct 24 is fixed to the duct base 17, and then the connection portion 32 of the movable duct 25 is connected to the server. The movable duct 25 can be easily communicated with the return path 12 simply by being inserted into the return port 14 from the room side. Therefore, labor and time when constructing the duct structure provided for each individual server rack 1 can be saved, and the cost required for construction can be reduced.

  The server rack 1 is provided with an air guide duct 20 and a shutter 44, and the shutter 44 is moved back and forth so that the duct interior space communicates with the rear exhaust passage 6 and the state communicates with the central exhaust passage 7. Then, the apparatus for air conditioning can be made into a common part. This is because the rear exhaust passage 6 for the full server S1 and the central exhaust passage 7 for the half server S2 are arranged at the front and rear inside the server rack 1, but the front and rear positions are moved by moving the shutter 44 back and forth. This is because the space in the air guide duct 20 can be communicated with the exhaust passages 6 and 7 while absorbing the deviation. Accordingly, while the half server S2 and the full server S1 are accommodated in the server rack 1 having the same structure, the air conditioning apparatus incorporated in each server rack 1 is made a common component, so that the entire air conditioning system for the server system is obtained. Cost can be reduced.

  When the cable rack 46 is provided on at least one of the front surface and the rear surface of the duct base 17, the power cable and the communication cable can be wired using the dead space between the server rack 1 and the ceiling L. Space can be used effectively.

  When the reinforcing frame 49 is fixed to the inner surface of the upper wall of the server rack 1, it is possible to prevent the upper wall of the server rack 1 from being bent and deformed by the weight of the power cable and the communication cable wired along the cable rack 46. Moreover, there is an advantage that the structural strength of the server rack 1 can be improved by adding the reinforcing frame 49.

  If the door panels 2a and 3a of the doors 2 and 3 of the server rack 1 are made of perforated plates, ventilation openings can be formed over the entire surface of the door panels 2a and 3a occupying most of the doors 2 and 3. Therefore, the air resistance in the server rack 1 can be effectively reduced by reducing the passage resistance of the conditioned air sucked in by the servers S1 and S2 at the doors 2 and 3.

  When the duct portion 18 is configured to be extendable and contractable by a fixed duct 24 and a movable duct 25 that slides up and down with respect to the fixed duct 24, the fixed duct 24 is fixed to the duct base 17, and then the connection portion 32 of the movable duct 25 is connected to the server. The movable duct 25 can be easily communicated with the return path 12 simply by being inserted into the return port 14 from the room side. Further, the gap between the return port 14 and the movable duct 25 can be easily sealed with the seal body 34. Therefore, labor and time when constructing the duct structure provided for each individual server rack 1 can be saved, and the cost required for construction can be reduced.

  If each of the fixed duct 24 and the movable duct 25 is formed of non-combustible corrugated cardboard obtained by laminating aluminum foil on the surface of corrugated paper, the duct weight can be significantly reduced as compared with the case where both the ducts 24 and 25 are formed of thin steel plates. . Further, when both ends of the lift string 84 exposed on the outer surface of the fixed duct 24 are pulled and the movable duct 25 can be pushed upward from the fixed duct 24 by the lift string 84, the return port of the movable duct 25 is obtained. 14 can be easily connected. Accordingly, it is possible to reduce the construction cost by omitting the labor required for the construction of the duct portion 18 incorporated between the ceiling L and the individual server racks 1.

  When the joint piece 68 in the fixed duct 24 is positioned on the outer surface of the duct and the joint piece 68 in the movable duct 25 is positioned on the inner surface of the duct, the relative sliding between the fixed duct 24 and the movable duct 25 can be performed smoothly. Furthermore, when the joining piece 68 is positioned on the sliding surfaces of the ducts 24 and 25, it is inevitable that a gap is formed in the vicinity of the joining piece 68, but the occurrence of such a gap is prevented, It is possible to simplify the sealing structure of the overlapping portion of both the ducts 24 and 25.

  The server rack 1 is provided with the air guide duct 20 and the shutter 44, and the attitude of the shutter 44 is switched so that the space in the duct communicates with the rear exhaust passage 6 and the state communicates with the central exhaust passage 7. The equipment for air conditioning can be made into a common part. This is because the rear exhaust passage 6 for the full server S1 and the central exhaust passage 7 for the half server S2 are arranged before and after the inside of the server rack 1, but only by switching the posture of the shutter 44, the wind guide This is because the space in the duct 20 can communicate with the exhaust passages 6 and 7. Accordingly, while the half server S2 and the full server S1 are accommodated in the server rack 1 having the same structure, the air conditioning apparatus incorporated in each server rack 1 is made a common component, so that the entire air conditioning system for the server system is obtained. Cost can be reduced.

  In the shutter structure in which the shutter 44 constituted by the pair of side walls 86 and the guide wall 87 is supported by the shutter shaft 88, the posture of the shutter 44 can be switched by swinging around the shutter shaft 88. Further, the shutter 44 is fixedly held by the fixture 89 so as not to be swingable in either one of the switching postures of the posture in which the guide wall 87 closes the rear exhaust passage 6 and the posture in which the guide wall 87 closes the central exhaust passage 7. be able to. Therefore, only for one type of air guide duct 20 with the shutter 44 incorporated, the server rack 1 in which the half server S2 is incorporated and the server rack 1 in which the full server S1 is incorporated are used for air conditioning. Equipment costs can be reduced. Further, the partial arc-shaped guide wall 87 guides the exhaust gas after the heat exchange, which has been moved from the exhaust passages 6 and 7 into the air guide duct 20, to the fan unit 19, so that the previous exhaust gas becomes the air guide duct 20. It is possible to eliminate the stagnation in the inside and improve the blowing efficiency by the fan unit 19.

It is a vertical side view which shows the principal part structure of the air conditioning system which concerns on this invention. It is a side view of a server rack system. It is a front view of a server rack system. It is a disassembled perspective view of a duct structure. It is a vertical side view which shows the connection state of a duct structure. It is a vertical side view which shows the arrangement structure of a wind guide duct. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is a perspective view which shows the dummy for half servers. It is a perspective view which shows the dummy for full servers. It is a side view of the server rack system which concerns on another Example. It is a vertical side view of the air conditioning system which concerns on another Example. It is a disassembled perspective view of the fixed duct which concerns on another Example. It is a disassembled perspective view of the movable duct which concerns on another Example. It is a disassembled sectional view of the fastener concerning another example. It is a cross-sectional top view of the state which engaged the fastener which concerns on another Example. It is a vertical side view which shows the raising structure of the movable duct which concerns on another Example. It is a side view which shows the assembly | attachment state of the duct part which concerns on another Example. It is a side view which shows the assembly | attachment state of the movable duct which concerns on another Example. It is a front view which shows the assembly completion state of the duct part which concerns on another Example. It is the DD sectional view taken on the line in FIG. It is a vertical side view which shows the shutter structure which concerns on another Example.

(Example) FIGS. 1-11 shows the Example of the air conditioning system for server systems based on this invention. In FIG. 2, reference numeral 1 denotes a server rack installed on the floor F, in which a server is mounted. The server is composed of a full server S1 having a front and rear length of about 700 mm and a half server S2 having a front and rear length of about 350 mm, both of which are mounted on the server rack 1 in a multistage manner. The server rack 1 that accommodates the full server S1 is opened only at the front surface, and the full server S1 can be mounted on the chassis provided in the rack from the front, and the front opening is opened and closed by a single swingable door 2. it can. In addition, the front and rear surfaces of the server rack 1 that accommodates the half server S2 are opened, and the half server S2 can be mounted on a chassis provided in the rack from the front and rear surfaces. Can be opened and closed by individual doors 3 and 3. The server rack 1 for the full server S1 and the server rack 1 for the half server S2 have the same basic structure except the difference in the number of doors and the same size.

  Each server S1 and S2 mounted in the server rack 1 is provided with a blower fan 4, and by driving the blower fan 4, the internal heat generating components are cooled, and then discharged from an exhaust port 5 provided on the back surface. it can. In order to efficiently supply cold air to each of the servers S1 and S2, the door panels 2a and 3a of the doors 2 and 3 of the server rack 1 are made of perforated plates. As the perforated plate, punching metal, expanded metal, honeycomb mesh or the like can be applied, but it is preferable to form the door panels 2a and 3a with a honeycomb mesh having the largest opening ratio.

  In the server rack 1 that accommodates the full server S1, a rear exhaust passage (flow guides the hot air discharged from the exhaust port 5 toward the ceiling L between the rear wall of the full server S1 and the back surface of the server rack 1). An exhaust passage 6 is provided (see FIG. 2). Further, in the server rack 1 that accommodates the half server S2, the hot air discharged from the exhaust port 5 is placed between the back surface of the half server S2 mounted from the front surface and the back surface of the half server S2 mounted from the rear surface. A central exhaust passage (exhaust passage) 7 that guides the flow toward the center is provided. That is, the exhaust ports 5 and 5 of the servers S1 and S2 face the exhaust passages 6 and 7 provided in the server rack 1, respectively. A passage R is provided in the floor F of the server room, and a server system is constructed by installing a group of server racks 1 in a straight line with the doors 2 and 3 facing the passage R. The left and right side surfaces of the rear exhaust passage 6 and the central exhaust passage 7 are closed with partition walls, so that the hot air discharged from the servers S1 and S2 to the rear exhaust passage 6 and the central exhaust passage 7 is transferred to the exhaust passages 6 and 7 respectively. The server rack 1 will not be leaked to the outside.

  The air conditioning system includes a cooler (air conditioner) 10 disposed in a room different from the server room, a supply path 11 for supplying the cool air (conditioned air) generated by the cooler 10 to the server room, and heat exchange. It comprises a return path 12 for returning the exhaust to the air conditioner 10 and a duct structure for connecting the return path 12 and each server rack 1. A supply path 11 made of a duct is disposed inside the ceiling L, and a plurality of supply ports 13 for sending cool air to the server room are provided on the lower surface of the supply path 11 along each passage R. The return path 12 made of a duct is arranged inside the ceiling L, and a group of return ports 14 for receiving hot air discharged from the server rack 1 is provided on the lower surface of the return path 12 facing each server rack 1. is there. The supply path 11 and the return path 12 are each formed by folding a corrugated cardboard in which aluminum foil is laminated on both front and back surfaces to form a square cross section.

  The duct structure includes a cylindrical duct base 17 fixed to the upper wall of the server rack 1, a duct portion 18 fixed to the upper surface of the duct base 17, a fan unit 19 disposed inside the duct base 17, and the duct base 17. It is comprised with the wind guide duct 20 etc. which were connected to the lower surface of this. As shown in FIG. 1, the duct base 17 is formed in a rectangular tube shape by a base frame 22 assembled in a rectangular parallelepiped shape and a panel 23 covering the front and rear peripheral surfaces and the left and right peripheral surfaces of the base frame 22. The server rack 1 is integrated by fastening 22 to the upper wall. An opening 15 corresponding to the lower opening of the base frame 22 is formed in the upper wall of the server rack 1.

  The duct portion 18 includes a fixed duct 24 fixed to the upper surface of the duct base 17 and a movable duct 25 that is supported by the fixed duct 24 so as to be slidable in the vertical direction and communicates with the return path 12. As shown in FIG. 4, the fixed duct 24 is configured by bending a plated steel plate into a square tube shape, and a fastening fitting 27 is fixed to the lower end of the four corner portions. Further, a sealing body 28 made of a mohair seal that closes the gap with the duct base 17 is fixed to the lower peripheral surface of the fixed duct 24. As shown in FIG. 5, the fixed duct 24 can be integrated with the duct base 17 by inserting the fixed duct 24 into the duct base 17 from the lower surface side and fastening the fastening bracket 27 to the base frame 22 with bolts. In this fixed state, the seal body 28 is elastically deformed and seals the gap between the fixed duct 24 and the duct base 17.

  The movable duct 25 is configured in a rectangular tube shape with columns 30 arranged at the four corners and cardboard paper 31 that is inserted into the connecting grooves 30 a of the adjacent columns 30. The corrugated paper 31 is made of corrugated paper in which aluminum foil is laminated on both front and back surfaces. The movable duct 25 is formed to be slightly smaller than the fixed duct 24, and at the upper part thereof, a connection part 32 connected to the return port 14, and a quadrangular regulation wall 33 formed to protrude below the connection part 32. Is provided. A first seal body (seal body) 34 is provided around the connection portion 32 in a circular shape, and a second seal body (seal body) 35 is provided at a lower portion of the movable duct 25 that slides with the fixed duct 24. Is provided. These seal bodies 34 and 35 are each made of a mohair seal and fixed to the movable duct 25 with a double-sided tape.

  Most of the movable duct 25 is inserted into the inner surface of the fixed duct 24 from the upper surface side, and then the connection portion 32 is inserted into the return port 14 until the entire wall is lifted and the restriction wall 33 is in close contact with the ceiling L. Thus, the fixed duct 24 and the return path 12 are communicated. In this communication state, the sliding surface with the return port 14 is sealed by the first seal body 34, and the sliding surface with the fixed duct 24 is sealed by the second seal body 35. In order to maintain this communication state, a fixed structure is provided between the fixed duct 24 and the movable duct 25. As shown in FIG. 5, the fixed structure includes a projection 36 provided on the front and rear of the movable duct 25 and an engagement hole 37 provided on the front and rear of the inner surface of the fixed duct 24 to drop and engage the projection 36. Thus, the movable duct 25 can be prevented from descending by its own weight when the projection 36 and the engagement hole 37 are engaged.

  The fan unit 19 is provided with eight blow fans 38, and the number of blow fans 38 to be driven can be increased or decreased according to the thermal load in the server rack 1. For this purpose, a temperature sensor (not shown) for detecting the thermal load in the server rack 1 is arranged above the rear exhaust passage 6 and the central exhaust passage 7.

  The air guide duct 20 is fixed to the inner surface of the upper wall of the server rack 1, and the lower surface opening thereof communicates with the rear exhaust passage 6 and the central exhaust passage 7 described above, and the upper surface opening is connected to the server rack. 1 communicates with the lower opening of the duct base 17 through an opening 15 provided in the upper wall of the duct. As shown in FIG. 1, the upper surface opening and the lower surface opening of the air guide duct 20 are formed in a state where they are displaced in the front-rear direction. This is because the opening 15 of the server rack 1 is positioned at the front-rear center of the upper wall. This is for securing an accommodation space for the cable rack 46 before and after the base 17. A partition plate 43 having a rear opening 41 and a front opening 42 is provided at the lower inner surface of the air guide duct 20, and a shutter that selectively opens the rear opening 41 and the front opening 42 on the upper surface side of the partition plate 43. 44 is provided (see FIG. 6).

  The shutter 44 can be slid back and forth, and in the server rack 1 that accommodates the full server S1, as shown in FIG. It can be in a state of communicating only with the exhaust passage 6. Thereby, the hot air in the rear exhaust passage 6 can be effectively fed to the duct portion 18 by the fan unit 19 provided in the duct base 17. Further, in the server rack 1 that accommodates the half server S2, as shown in FIG. 9, the space in the air guide duct 20 is switched to a state in which only the central exhaust passage 7 is communicated by moving the shutter 44 rearward. be able to. Therefore, the hot air in the central exhaust passage 7 can be effectively supplied to the duct portion 18 by the fan unit 19 provided in the duct base 17.

  In order to supply power to the full server S1 and the half server S2 accommodated in the server rack 1 or to connect a communication cable, a lead-in hole is opened in the upper wall of the server rack 1. Further, in order to support the power cable and the communication cable wired along the ceiling L, two upper and lower cable racks 46 are provided on each of the front surface and the rear surface of the duct base 17. As shown in FIG. 1, the cable rack 46 is composed of two sets of brackets 47 that are engaged and mounted on the top and bottom of the panel 23, and a rack-shaped rack body 48 that is supported by the brackets 47. is there. The rack body 48 is reduced in weight by using a metal wire material as a raw material to form an open eyelid structure. However, in the state where the power cable and the communication cable are arranged on each of the two front and two rear rack bodies 48, a load of about 100 kg is applied, and the upper wall of the server rack 1 is bent and deformed. In order to prevent such bending deformation of the upper wall, reinforcing frames 49 are fixed around the inner surface of the upper wall of the server rack 1 facing the base frame 22.

  A full server S1 or a half server S2 is mounted in a multistage manner on the chassis inside the server rack 1. For example, the servers S1 and S2 may be removed from the chassis for maintenance. In such a case, the cold air may be directly drawn into the rear exhaust passage 6 or the central exhaust passage 7 through the space of the non-mounting portion. In order to prevent such a cold short circuit, dummy 51 and 52 corresponding to each of the servers S1 and S2 are provided, and the space of the non-mounting portion is closed with the dummy 51 and 52.

  As shown in FIG. 11, the dummy 51 for the full server S <b> 1 includes a front plate 53 made of an aluminum extrusion material, and a pair of fasteners 55 that are press-fitted into a connecting groove 54 provided on the front plate 53. By fastening the fastening bracket 55 to the previous chassis with a screw, the front surface of the space of the non-mounting portion can be closed. As shown in FIG. 10, the dummy 52 for the half server S2 includes a pair of left and right side plates press-fitted into a front plate 56 and a rear plate 57 made of an extruded material made of aluminum and a connecting groove 58 provided in both plates 56 and 57. 59 and 59 are formed in a square frame shape. The front plate 56 and the rear plate 57 are made of the same parts. A fastening seat 60 is integrally bent at the front ends of the side plates 59 and 59, and the entire space of the non-mounting portion can be closed by fastening the pair of fastening seats 60 to the previous chassis with screws.

  Next, the flow of cold air and hot air when the server system is cooled by the air conditioning system will be described. The cool air generated by the air conditioner 10 is distributed to the supply path 11 arranged along the passage, and then sent out from the supply port 13 to each server room and settles down to the path R side due to the difference in specific gravity with the surrounding air. To do. Inside the server rack 1, cool air is drawn in through the doors 2 and 3 by the blower fans 4 provided in the servers S 1 and S 2 in operation, and the heat generating parts inside the server are cooled and then provided on the back surface. Then, the air is discharged from the exhaust port 5 to the rear exhaust passage 6 and the central exhaust passage 7. The hot air after the heat exchange in the exhaust passages 6 and 7 flows upward in the exhaust passages 6 and 7 by the drawing action by the blower fan 38 of the fan unit 19 and the floating action due to the difference in specific gravity with the ambient air. The air then flows into the duct base 17 through the air guide duct 20. Further, the air is pressurized by the blower fan 38 and is forcibly fed to the return path 12 through the fixed duct 24 and the movable duct 25. The hot air in the return path 12 is returned to the cooling device 10 through a passage (not shown) and cooled again.

  As described above, the supply path 11 and the return path 12 are provided on the back of the ceiling, and the server rack 1 and the return path 12 are connected by a duct structure, and the hot air after heat exchange is forced to the return path 12 by the fan unit 19. If the air is supplied, the hot air can be prevented from diffusing or filling the server room. Therefore, compared with the conventional air conditioning system which discharged | emitted the hot air after heat exchange to the server room, the circulation form of conditioned air can be optimized and server S1 * S2 mounted in the server rack 1 can be cooled suitably. . In addition, the air in the server room and the server rack 1 can be effectively conditioned. In addition, since cold air is supplied using the space behind the ceiling and hot air is recovered, it is necessary to provide a wasteful space under the floor compared to conventional air conditioning systems that required a cold air supply space under the floor. In addition, the cost required to construct the building can be reduced accordingly.

  Since the air guide duct 20 and the shutter 44 are provided, and the shutter 44 is moved back and forth so that either the rear exhaust passage 6 or the central exhaust passage 7 communicates with the duct structure, the exhaust passages 6 and 7 are positioned forward and backward. Despite being arranged in a shifted state, it is possible to reduce the overall cost of the air conditioning system by using a common component for air conditioning equipment.

  12 to 23 show another embodiment of the air conditioning system, in which the structure of the duct portion 18 and the structure of the shutter 44 are changed as follows from the previous embodiment. Different. Further, the entire ceiling space behind the ceiling is used as the return path 12 so that the load of the exhaust air after heat exchange to the air conditioner 10 can be reduced. The duct portion 18 includes a fixed duct 24 fixed to the upper surface of the duct base 17 and a movable duct 25 that is supported by the fixed duct 24 so as to be vertically slidable and communicates with the return path 12. In the upper part of the movable duct 25, there are provided a connection portion 32 connected to the return port 14 of the return path 12 and a seal body 34 that seals a gap between the return port 14 of the ceiling L and the movable duct 25. is there. The movable duct 25 communicates with the return path 12 by inserting the connection portion 32 of the movable duct 25 from the server room side to the return port 14. The cable rack 46 in this embodiment has a structure suspended from the ceiling L, and is arranged at three locations above and below the front surface of the duct structure and above the rear surface of the duct structure.

  As shown in FIGS. 14 and 15, each of the fixed duct 24 and the movable duct 25 is configured by assembling a pair of duct parts 64 and 65 in a box shape. The duct parts 64 and 65 are each made of non-combustible corrugated cardboard (Kurimoto Iron Works, Colair Duct (registered trademark)) in which aluminum foil is laminated on the surface of corrugated paper. Specifically, the duct parts 64 and 65 include two duct walls 66 and 67 that are adjacent to each other via a fold formed on a non-combustible corrugated cardboard, and a narrow joint piece that is continuous with one duct wall 67 via the fold. 68. In order to prevent moisture from entering the inner surface of the cardboard, the periphery of the duct parts 64 and 65 is sealed with a seal tape 79 made of an aluminum tape provided with an adhesive layer. The duct parts 64 and 65 are collectively brought into the construction site in the unfolded state, and then folded into a predetermined shape along the previous crease and assembled into a box shape.

  As shown in FIG. 14, the fixed duct 24 assembles a pair of duct parts 64 in a box shape with the joining pieces 68 positioned on the outer surface of the duct, and the joining pieces 68 are exposed on the inner surfaces of the duct walls 66 and 67. Avoid doing. Further, as shown in FIG. 15, the movable duct 25 assembles a pair of duct parts 65 into a box shape with the joining piece 68 positioned on the inner surface of the duct, and the joining piece 68 on the outer surface of each of the duct walls 66 and 67. Avoid exposing. As described above, by forming the inner peripheral surface of the fixed duct 24 and the outer peripheral surface of the movable duct 25 flat, the relative sliding between the fixed duct 24 and the movable duct 25 can be performed smoothly. In a state where the pair of duct parts 64 and 65 are assembled in a box shape and the fixed duct 24 and the movable duct 25 are formed in a box shape, the duct wall 66 constitutes the front wall or the rear wall of the fixed duct 24 and the movable duct 25. The duct wall 67 constitutes the left wall or the right wall of both the ducts 24 and 25.

  A plurality of joint portions of the joint piece 68 are fixed by plastic fasteners 69 developed for the duct parts 64 and 65 to maintain a box shape. In addition, the overlapping ends of the fixed duct 24 and the movable duct 25 are fixed by the previous fastener 69 to maintain a connected state. Furthermore, the overlapping end of the duct base 17 and the fixed duct 24 is fixed by another fastening pin 70.

  The fastener 69 includes a female fastener 69a fixed to the duct wall on the inner surface side, a male fastener 69b engaged with the female fastener 69a from the duct wall on the outer surface side, and an engagement ring for fixing the female fastener 69a. 69c, a guide ring 69d, and the like. By engaging the engagement ring 69c with the female fastener 69a, the female fastener 69a can be fixed to the inner surface of the duct wall on the inner surface side. Further, by engaging the engagement ring 69c with the guide ring 69d, the guide ring 69d can be fixed to the outer surface of the duct wall on the outer surface side. After the male fastener 69b is inserted into the guide ring 69d, the engaging claw 72 of the male fastener 69b is hooked on the engaging frame 73 of the female fastener 69a by turning 90 degrees, so that it can be moved in and out. The overlapping duct walls can be fixed inseparably. Details of this type of fastener 69 are disclosed in Japanese Patent Application Laid-Open No. 2008-286502.

  In the duct part 64 for the fixed duct 24, the guide ring 69d and the female fastener 69a are fixed to the upper and lower sides of the joining piece 68 and the duct wall 66, and the guide ring 69d is fixed to the left and right of the upper part of the front and rear duct walls 66. It is. A connecting hole 74 for the fastening pin 70 is fixed along the lower edges of the duct walls 66 and 67. Furthermore, between the guide rings 69d provided on the left and right of the upper portion of the duct wall 66, an insertion hole 75 for a lift string 84 described later is formed.

  In the duct part 65 for the movable duct 25, the guide ring 69d and the female fastener 69a are fixed above and below the joining piece 68 and the duct wall 66, and the female fastener 69a is fixed to the left and right of the lower part of the front and rear duct walls 66. It is. Further, between the left and right female fasteners 69a, an insertion hole 76 for a lift string 84 described later is formed.

  The fastening pin 70 includes a sleeve with a flange and a pin supported by the sleeve. After the sleeve is inserted into the connecting hole 74 of the fixed duct 24 and the connecting hole of the duct base 17, the distal end of the sleeve is expanded by pushing the pin, and the fixed duct 24 can be fixed to the duct base 17.

  In order to prevent moisture from entering the inner surface of the corrugated cardboard, the joining ends of the joining pieces 68 in the ducts 24 and 25 assembled in a box shape are sealed tape made of aluminum tape (not shown) provided with an adhesive layer. It is sealed with. Similarly, the outer surfaces of the female fastener 69a and the male fastener 69b are sealed with a sealing tape 81 made of aluminum tape (see FIG. 17). The sealing body 34 is made of closed-cell foamed urethane, and is adhesively fixed in a circular manner near the upper end of the movable duct 25 assembled in a box shape. The part is sealed with caulking material.

  As shown in FIG. 19, the duct portion 18 is assembled to the duct base 17 using a space between the rear cable rack 46 and the upper end of the server rack 1. Specifically, after the movable duct 25 is fitted inside the fixed duct 24, the lower part of the fixed duct 24 is attached to the duct base 17 after being inserted from below the rear cable rack 46 to above the duct base 17. It fits and it fixes with the plastic fastening pin 70 which penetrates both. Further, the movable duct 25 is drawn upward, the connecting portion 32 is connected to the return port 14 of the ceiling L, and the seal body 34 is brought into close contact with the ceiling L. In this state, the overlapping portions of the fixed duct 24 and the movable duct 25 are fixed with the previous fastener 69, and the overlapping ends of both the ducts 24 and 25 and the outer surface of the fastener 69 are sealed with a sealing tape.

  In order to more easily perform a series of operations when the duct base 17 and the return port 14 are connected by the duct portion 18, a lift string that pushes up the movable duct 25 between the fixed duct 24 and the movable duct 25. 84 is provided. The lift string 84 is made of a thin ribbon-shaped plastic string that is commercially available as a packing string. The lift string 84 is inserted into the insertion holes 75 and 76 provided in the fixed duct 24 and the movable duct 25, and the front and rear ends of the string are fixed to the fixed duct 24. Exposed on the outside. In a state where the movable duct 25 is fitted in the fixed duct 24, the lift cord 84 enters the inside of the fixed duct 24 by the difference in height between the insertion hole 75 of the fixed duct 24 and the insertion hole 76 of the movable duct 25 ( (See FIG. 20).

  As shown in FIG. 20, the lower part of the fixed duct 24 is externally fitted to the duct base 17 and fixed with the fastening pin 70, and then the lift string 84 exposed from the front and rear insertion holes 76 is pulled. The movable duct 25 can be pushed upward from the fixed duct 24 by the lift string 84. Further, the connecting portion 32 of the movable duct 25 pushed out from the fixed duct 24 can be easily inserted and connected to the return port 14. In this state, the center height of the female fastener 69a of the movable duct 25 substantially coincides with the center height of the guide ring 69d. Accordingly, as shown in FIGS. 21 and 22, the movable duct 25 is easily fixed to the fixed duct 24 by engaging the male fastener 69 b with the female fastener 69 a of the movable duct 25 from the outer surface of the fixed duct 24. be able to. The lift string 84 is pulled out of the insertion hole 76 and discarded after fixing the overlapping portion of the fixed duct 24 and the movable duct 25 with the fastener 69, and the outer surface of the insertion hole 75 is sealed with the seal tape 81.

  As shown in FIG. 23, regarding the shutter structure, the cross-sectional shape passing through the center of the right and left of the air guide duct 20 is an isosceles trapezoid so that the structure of the air guide duct 20 is simplified and the lower surface opening is rear exhausted. The passage 6 and the central exhaust passage 7 were communicated simultaneously. In addition, the shutter 44 is configured in a three-dimensional shape by a pair of quadrant side walls 86 and a partial arc-shaped guide wall 87 that connects the arc peripheral surfaces of both side walls 86. The shutter 44 is a shutter shaft 88 mounted on the air guide duct 20, and the posture is switched between a posture in which the outer surface of the guide wall 87 closes the rear exhaust passage 6 and a posture in which the outer surface of the guide wall 87 closes the central exhaust passage 7. Support is possible. In either one of the switching postures, a fixture 89 is provided on the inner surface of one side wall 86 in order to fix and hold the shutter 44 so as not to swing. The fixing tool 89 is composed of a butterfly screw, and its screw shaft is screwed into a screw hole 90 provided in the air guide duct 20 through an insertion hole provided in the side wall 86. The insertion hole of the side wall 86 and the screw hole 90 are provided at two positions on the front and rear sides of the inner surface of the air guide duct 20 at a position away from the shutter shaft 88 in accordance with the difference in switching posture. Further, in this embodiment, the fan unit 19 is arranged on the upper opening surface of the air guide duct 20 so that the hot air after the heat exchange in the air guide duct 20 can be exhausted more reliably.

  As described above, when the shutter 44 is configured in a three-dimensional shape by the quadrangular side wall 86 and the partially arcuate guide wall 87, the center of the front and rear of the lower opening of the air guide duct 20 and the upper opening in each switching posture. A guide wall 87 can divide between the front end or the front-rear center of the lower opening and the rear end of the upper opening. Therefore, for example, the hot air after heat exchange in the central exhaust passage 7 (or the rear exhaust passage 6) is guided toward the duct base 17 by the guide wall 87, so that the blowing efficiency by the fan unit 19 can be improved. Incidentally, in the case of the flat shutter 44 described with reference to FIG. 6, when the rear exhaust passage 6 is closed with the shutter 44 as shown in FIG. 1, the hot air after heat exchange is a space above the shutter 44. It is inevitable to stay in the water. However, according to the three-dimensionally configured shutter 44 in FIG. 23, it is possible to eliminate the retention of hot air after heat exchange in the air guide duct 20 and to improve the blowing efficiency by the fan unit 19.

  In the above embodiment, the return path 12 is constituted by a duct, but this is not necessary, and the space behind the ceiling can be used as the return path. In that case, the connection part 32 of the movable duct 25 only needs to be connected to the space behind the ceiling. The air guide duct 20 can be provided on the upper surface of the upper wall of the server rack 1. For example, when the cable rack 46 is disposed only on the front side of the duct base 17, the upper surface opening of the air guide duct 20 can be located at the rear portion of the upper wall of the server rack 1. The conditioned air does not need to be cold, and may be warm in a cold region. The fixed structure that holds the assembled state of the movable duct 25 does not need to be a structure that engages in a concave-convex manner, and may be any structure that can restrict the movable duct 25 from dropping due to its own weight. For example, the movable duct 25 can be fixed by wrapping an industrial adhesive tape around adjacent portions of the fixed duct 24 and the movable duct 25.

  In the embodiment shown in FIG. 12 and subsequent figures, each of the fixed duct 24 and the movable duct 25 is constituted by a pair of duct parts 64 and 65. However, this is not necessary, and one duct part 64 and 65 is assembled in a box shape. can do. In that case, a pair of duct walls 66 and 67 may be alternately formed on the duct parts 64 and 65, and a narrow joint piece 68 may be provided at one end in the circumferential direction. Further, the fixture 89 need not be formed of a thumbscrew, and a detachable fastening body such as a screw or a pin can be used.

  The lift string 75 can be passed from one side of the opposing wall of the fixed duct 24 to the other side of the opposing wall of the fixed duct 24 after being arranged in a state where the lower surface opening of the movable duct 25 is crossed back and forth. The seal body 34 can be provided on the ceiling L side, for example, on the inner surface of the return port 14.

DESCRIPTION OF SYMBOLS 1 Server rack 2 * 3 Door 4 Blower fan 5 Exhaust port 6 Rear exhaust passage 7 Central exhaust passage 10 Air conditioner (cooling machine)
DESCRIPTION OF SYMBOLS 11 Supply path 12 Return path 13 Supply port 14 Return port 17 Duct base 18 Duct part 19 Fan unit 20 Air guide duct 24 Fixed duct 25 Movable duct 38 Blower fan 44 Shutter

Claims (11)

A supply path (11) for supplying conditioned air generated by the air conditioner (10) to the interior of the ceiling (L), and a return path (12) for returning the exhaust gas after heat exchange to the air conditioner (10). And is provided,
The supply path (11) is provided with a supply port (13) for sending conditioned air to the server room.
The server rack (1) installed on the floor (F) and the return path (12) are connected via a duct structure for feeding and guiding the exhaust gas after heat exchange to the return path (12).
The duct structure has a cylindrical duct base (17) fixed to the upper wall of the server rack (1), a duct portion (18) fixed to the upper surface of the duct base (17), and a duct base (17). Including a fan unit (19) arranged inside,
The servers (S 1, S 2) are mounted in a multi-stage manner with respect to the server rack (1), and the exhaust port (5) provided on the back of the server (S 1, S 2) faces the exhaust passage (6, 7) inside the server rack (1). There is
The exhaust discharged into the exhaust passages (6, 7) is forcibly sent to the return path (12) via the duct base (17) and the duct part (18) by the fan unit (19). An air conditioning system for server systems. The duct portion (18) is fixed to the upper surface of the duct base (17), and the movable duct (25) is supported by the fixed duct (24) so as to be vertically slidable and communicates with the return path (12). ) And
On the upper part of the movable duct (25), there are a connection part (32) connected to the return port (14) of the return path (12), and a regulation wall (33) formed to project below the connection part (32). And is provided,
The movable duct (25) is inserted into the return port (14) from the server room side until the regulating wall (33) contacts the ceiling (L), and the movable duct (25) communicates with the return path (12). The air conditioning system for server systems according to claim 1. The full server (S1) is mounted from the front of the server rack (1), and the exhaust port (5) of the full server (S1) faces the rear exhaust passage (6) provided at the rear of the server rack (1). Yes,
Half servers (S2) are mounted from the front and rear surfaces of the server rack (1), and the exhaust ports (5) of the front and rear half servers (S2) are connected to the central exhaust passage (7) at the front and rear center of the server rack (1). It has come,
A wind guide duct (20) communicating the rear exhaust passage (6) and the central exhaust passage (7) with the duct base (17) is provided in the server rack (1).
A shutter (44) that switches between a state in which the space in the duct of the air guide duct (20) communicates with the rear exhaust passage (6) and a state in which the space communicates with the central exhaust passage (7) is provided inside the air guide duct (20). The air conditioning system for server systems according to claim 1 or 2, wherein A cable rack (46) that supports the power cable and the communication cable is provided on at least one of the front surface and the rear surface of the duct base (17).
The cable rack (46) is composed of a plurality of brackets (47) engaged with the duct base (17) and a rack-like rack body (48) supported by the brackets (47). The air conditioning system for server systems in any one of 1-3.   The air conditioning system for a server system according to claim 4, wherein a reinforcing frame (49) is fixed to the inner surface of the upper wall of the server rack (1). The front and rear surfaces of the server rack (1) are provided with doors (2 and 3) that can be opened and closed at least on the front surface.
The air conditioning system for a server system according to any one of claims 1 to 5, wherein a door panel of the door (2, 3) is formed of a perforated plate. The duct portion (18) is fixed to the upper surface of the duct base (17), and the movable duct (25) is supported by the fixed duct (24) so as to be vertically slidable and communicates with the return path (12). ) And
In the upper part of the movable duct (25), there are a connection part (32) connected to the return port (14) of the return path (12), the return port (14) of the ceiling (L), and the movable duct (25). And a sealing body (34) for sealing a gap between them,
The server system according to claim 1, wherein the movable duct (25) is connected to the return path (12) by inserting the connecting portion (32) of the movable duct (25) into the return port (14) from the server room side. Air conditioning system for use. Each of the fixed duct (24) and the movable duct (25) is formed of non-combustible corrugated cardboard obtained by laminating an aluminum foil on the surface of corrugated paper,
In a state in which the movable duct (25) is fitted inside the fixed duct (24), a lift string (75) that pushes up the movable duct (25) is lifted from one of the opposing walls of the fixed duct (24). , Passed through the movable duct (25) to the other of the opposing walls of the fixed duct (24),
With the lower part of the fixed duct (24) fixed to the duct base (17), both ends of the lift string (75) exposed on the outer surface of the fixed duct (24) are pulled to operate the movable duct (25). The air conditioning system for a server system according to claim 7, wherein the lift string (75) can be pushed upward from the fixed duct (24). The fixed duct (24) and the movable duct (25) are configured by assembling the duct parts (64, 65) in a square box shape,
The duct parts (64, 65) are integrally provided with a duct wall (66, 67) and a narrow joint piece (68) continuous to the circumferential end of the duct wall (66, 67).
The fixed duct (24) is configured by assembling the duct parts (64) in a box shape with the joining piece (68) positioned on the outer surface of the duct,
The movable duct (25) is configured by assembling the duct parts (65) in a box shape with the joining piece (68) positioned on the inner surface of the duct,
The overlapping end of the duct base (17) and the fixed duct (24), the overlapping end of the movable duct (25) and the fixed duct (24), and the connecting end of the joining piece (68) are sealed with sealing tape. An air conditioning system for a server system according to claim 7 or 8. The full server (S1) is mounted from the front of the server rack (1), and the exhaust port (5) of the full server (S1) faces the rear exhaust passage (6) provided at the rear of the server rack (1). Yes,
Half servers (S2) are mounted from the front and rear surfaces of the server rack (1), and the exhaust ports (5) of the front and rear half servers (S2) are connected to the central exhaust passage (7) at the front and rear center of the server rack (1). It has come,
A wind guide duct (20) communicating the rear exhaust passage (6) and the central exhaust passage (7) with the duct base (17) is provided in the server rack (1).
A shutter (44) that switches between a state in which the space in the duct of the air guide duct (20) communicates with the rear exhaust passage (6) and a state in which the space communicates with the central exhaust passage (7) is provided inside the air guide duct (20). The air conditioning system for a server system according to any one of claims 7 to 9, wherein the air conditioning system is for a server system. The air guide duct (20) has an isosceles trapezoidal cross section, and its lower surface opening communicates simultaneously with the rear exhaust passage (6) and the central exhaust passage (7).
The shutter (44) is composed of a pair of quadrant side walls (86) and a partial arcuate guide wall (87) connecting the arc peripheries of both side walls (86),
The shutter (44) is pivotally supported by a shutter shaft (88) mounted on the air guide duct (20), and the guide wall (87) closes the rear exhaust passage (6) and the guide wall (87) is in the center. It is configured so that the posture can be switched to a posture that blocks the exhaust passage (7),
11. The fixing device (89) for fixing and holding the shutter (44) so as not to be swingable in any one of the switching positions is provided between the shutter (44) and the air guide duct (20). Air conditioning system for server systems.

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