JP2014197244A - Computer room air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computer room air conditioning system capable of constantly and stably maintaining a pressure in a passage in a fixed range without generating the unnecessary leakage of cooled air or heated air.SOLUTION: A passage 4 configured to supply cooled air to a storage rack 3, and to exhaust heated air from the storage rack 3 is disposed between a plurality of storage racks 3. The upper part of the passage 4 is covered with an upper shield 10. The upper shield 10 is formed with: a communication port 14 configured to allow the inside and outside of the passage 4 to communicate with each other; and an inflexible lid body 16 configured to close the communication port 14 by gravity, and to open the communication port 14 by an air pressure in the passage 4.

Description

  The present invention relates to an air conditioning system for a computer room in which a plurality of storage racks for storing various devices such as electronic computers are arranged.

  In the computer room, devices such as electronic computers, information devices, and communication devices are housed in a plurality of housing racks and arranged in a highly integrated manner. And although the apparatus accommodated in each accommodation rack emits heat at the time of use, it is necessary to keep the operating temperature low in order to obtain the stable operation | movement of an apparatus.

For this reason, in a computer room in which a plurality of devices are installed in a storage rack, cooling air is blown out from a lower discharge passage such as a double floor to a passage on the front side of the storage rack.
The computer room air conditioning system adopted here is provided with an air supply surface for taking in cooling air on the front side of each accommodation rack that accommodates equipment, and heats the back side or the upper surface side of each accommodation rack. An exhaust surface for exhausting the hot air to the outside is provided. In the computer room, a plurality of storage racks are arranged so that the air supply surfaces face each other across the passage, and the cooling air blown out from the air conditioner passes through the passage between the racks from below the floor to each storage rack. Supplied. And the air (heated air) heated by cooling the equipment in each storage rack is returned again to the air inlet of the air conditioner.

  In this type of computer room air conditioning system, in order to efficiently cool the equipment in the storage rack without causing hot air to circulate to the air supply side, the space between the storage racks on both sides of the path is It is closed by an upper shield covering the upper part and an end shield covering the end of the passage. Moreover, in each accommodation rack, in order to cool the apparatus and to release the heated hot air to the outside, a heat radiating fan is installed on the back side or the top side (see, for example, Patent Documents 1 and 2). ).

  Also, in this type of computer room air conditioning system, in order to prevent the heat on the exhaust heat side from entering the cooling side passage through the gaps between the parts, the air supply capacity of the air conditioner is the exhaust of the exhaust heat fan of the storage rack. It is set higher than ability. For this reason, when cooling air with an excessive flow rate is introduced into the passage for some reason, there is a concern that a load that greatly exceeds the exhaust capacity acts on the exhaust fan.

  For this reason, what is shown by patent document 3, what is described in patent document 4, etc. are devised as a computer room air conditioning system which can cope with this.

  The computer room air conditioning system described in Patent Document 3 is provided with a communication portion that allows air to pass through the upper shield of the cooling side passage in the computer room, and at the edge of the passage portion, When the pressure rises above a specified pressure, a flexible valve body is attached that is bent and deformed under the pressure to open the communicating portion. In this system, when the pressure in the passage rises above a specified pressure, the valve body opens the communicating portion and releases the air in the passage to the outside, thereby suppressing the pressure rise in the passage.

  Further, in the computer room air conditioning system described in Patent Document 4, a part of the upper shielding body of the cooling side passage in the computer room is constituted by a flexible sheet, and the pressure in the passage rises above a specified pressure. When you do this, a part of the seat turns over to let the air in the passage escape to the outside.

Japanese Patent No. 3833515 JP 2006-526205 A JP 2007-316989 A JP 2010-107188 A

  However, in the computer room air conditioning system described in Patent Document 1, a communication portion for allowing the air in the passage to escape to the outside is provided in the upper shield, and the communication portion is opened and closed by a flexible valve body. Therefore, the characteristics of the valve body are likely to change over time, and it is difficult to maintain a stable opening / closing operation over a long period of time.

  In addition, the computer room air conditioning system described in Patent Document 2 allows air in the passage to escape to the outside by turning up the flexible sheet member, so that a stable opening operation can be performed when the pressure in the passage rises. It is difficult to obtain, and the cold air in the passage easily escapes to the outside during normal operation in which the pressure in the passage does not rise above the specified pressure.

  Therefore, the present invention is intended to provide a computer room air conditioning system capable of stably maintaining the pressure in the passage constantly within a certain range without causing unnecessary leakage of cooling air or hot air.

The computer room air conditioning system according to the present invention includes a plurality of storage racks, each having a plurality of devices housed therein, each having a supply surface for taking in cooling air and an exhaust surface for exhausting heated hot air, and a plurality of rows A passage formed between the storage racks, an air conditioner that sucks in hot air and sends out cooling air, a cooling air circulation portion and a hot air circulation portion that covers the upper portion of the passage. An upper shield body that is spaced apart from each other. The upper shield body includes a communication port that communicates with the inside and the outside of the passage, and the non-possibility that the communication port is closed by gravity and the communication port is opened by air pressure in the passage. And a flexible lid.
Thus, when the pressure in the passage is less than the specified pressure, the non-flexible lid closes the communication port by its own weight, and when the pressure in the passage exceeds the specified pressure, the non-flexible lid The lid opens the communication port against gravity and allows a part of the air in the passage to escape to the outside.

The lid body may have a structure in which a plurality of lid components having different weights and capable of independent lifting operations are combined. In this case, the lid constituting member of the lid is selectively pushed up according to the pressure in the passage, and the opening area of the communication port is appropriately adjusted.
In this case, it is desirable that the plurality of lid components include a displacement restricting portion that restricts the downward displacement of the relatively light component by the relatively heavy component.

Further, a contact switch for detecting that the lid has been opened may be provided between the lid and the opening edge of the communication port.
In this case, the contact switch may be connected to the air flow control unit of the air conditioner, and the air flow control unit may control the air flow rate of the air conditioner according to the detection signal of the contact switch. In this case, it is possible to appropriately control the air flow rate of the air conditioner according to the pressure in the passage without adding a dedicated pressure sensor.

Moreover, you may make it provide the urging | biasing spring which urges | biases the said cover body below. In this case, it is possible to assist the gravity of the lid acting in the direction of closing the communication port by the urging spring, and it is possible to control the behavior of the lid as desired by the urging spring.
Furthermore, you may make it provide the electromagnetic solenoid which controls the set load of the said urging | biasing spring. In this case, the opening opening load of the lid and the behavior of the lid can be easily adjusted by the electromagnetic solenoid.

  According to this invention, the non-flexible lid closes the communication port by gravity, and when the pressure in the passage rises above the set pressure, the non-flexible lid resists the gravity against the communication port. Because the structure is open, while the pressure in the passage does not reach the set pressure, the lid can reliably close the communication port to prevent unnecessary leakage of cooling air and hot air. Since there is no deterioration such as sag due to use over time, the pressure in the passage can always be stably maintained within a certain range.

It is a perspective view which shows the outline | summary of the computer room air conditioning system of embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 1st Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 2nd Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 3rd Embodiment of this invention. It is a perspective view of the upper shielding body in the computer room air conditioning system of 4th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 4th Embodiment of this invention. It is a perspective view of the upper shielding body in the computer room air conditioning system of 5th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 5th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 5th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 5th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 5th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 6th Embodiment of this invention. It is typical sectional drawing corresponding to the AA cross section of FIG. 1 of the computer room air conditioning system of 7th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a computer room air conditioning system 100 common to the embodiments. First, the configuration of the computer room air conditioning system 100 common to the embodiments will be described with reference to FIG.
As shown in FIG. 1, a computer room air conditioning system 100 is used in a computer room 101 formed in, for example, a substantially box shape. The computer room 101 is surrounded by the floor 1, a wall and a ceiling (not shown). A double floor 2 is provided so as to be spaced upward from the floor 1, and a plurality of storage racks 3 are disposed on the double floor 2 so as to face each other, for example, in two rows. A passage 4 is disposed on the double floor 2 sandwiched between the two rows of storage racks 3. An internal space 5 is provided under the double floor 2, and the internal wiring 5 accommodates electrical wiring of each storage rack 3, electrical wiring of an air conditioner 6 described later, and the like.

A number of blowing holes 8 are formed on the passage 4 extending in the longitudinal direction of the double floor 2. The internal space 5 under the floor and the passage 4 communicate with each other through the plurality of blowing holes 8 so as to allow ventilation.
An air conditioner 6 is installed on the double floor 2 outside the passage 4. In the air conditioner 6, the hot air exhausted from the accommodation rack 3 is sucked from the suction port 6 a to be cooled, and the air (cooling air) cooled in the air conditioner 6 is sent from the bottom outlet 6 b to the interior space 5. To send.

  The cooling air supplied from the air conditioner 6 to the internal space 5 is supplied onto the passage 4 through the blowout hole 8. Each accommodation rack 3 is formed in a box shape and accommodates devices such as an electronic computer and a communication device. The housing 3a of each storage rack 3 is provided with an air supply surface 3b on the front surface side and an exhaust surface 3d on the upper surface side. An exhaust fan 3c is provided on the exhaust surface 3d. Each accommodation rack 3 is supplied with cooling air from the passage 4 side, and the equipment is cooled by the cooling air. The air that has cooled the device becomes hot air and is discharged from the exhaust fan 3c to the outside.

  In the computer room air conditioning system 100, the upper shield 10 is installed between the upper surfaces of the storage racks 3 arranged to face each other with the passage 4 interposed therebetween. In the case of this embodiment, the upper shield 10 is formed in a box shape without a bottom. The upper shield 10 separates the cooling air circulation part in the passage 4 from the hot air circulation part above the housing rack 3. A pair of end shields 11 that connect the side ends of the storage racks 3 on opposite sides of the passage 4 are attached to the ends on both sides in the extending direction of the passage 4. These end shields 11 separate the cooling air circulation part in the passage 4 from the circulation part of the thermal space outside the accommodation rack 3 at the end part. In this embodiment, the passage 4 is a closed space S on the double floor 2 surrounded by the receiving racks 3 on both sides, the upper shield 10 and the pair of end shields 11.

FIG. 2 is a cross-sectional view corresponding to the AA cross section of FIG. 1 of the first embodiment of the present invention.
In the case of the first embodiment, the upper shield 10 has an opening 12 formed in the upper wall substrate 10a, and a support housing 13 attached to the upper surface side of the upper wall substrate 10a so as to cover the opening 12. Yes. The support housing 13 is formed in a substantially box shape with an open bottom. A communication port 14 that communicates the inside and outside of the passage 4 is formed on the upper wall of the support housing 13. In this embodiment, the support housing 13 is attached to the upper wall base material 10a of the upper shield 10 and the communication port 14 is provided in the support housing 13, but the upper wall of the upper shield 10 is provided. It is also possible to form the communication port 14 directly in the base material 10a.

A lid 16 is attached to the edge of the communication port 14 on the support housing 13 via a hinge 15 so as to be rotatable in the vertical direction. The lid body 16 is formed of an inflexible member such as metal or hard resin, and is formed in a plate shape having a larger outer shape than the communication port 14. The lid 16 closes the communication port 14 from above by its own weight.
In the case of this embodiment, the lid body 16 opens and closes the communication port 14 by a balance between its own weight acting on the center of gravity G and the pressure of the cooling air in the passage 4. The opening pressure of the communication port 14 by the lid body 16 is set and adjusted by the weight of the lid body 16 determined by the thickness, outer shape, material, and the like of the lid body 16.

  In the computer room air conditioning system of this embodiment, the cover 16 closes the communication port 14 of the upper shield 10 by its own gravity when the pressure of the cooling air in the passage 4 is less than the set pressure. . In the computer room air conditioning system of this embodiment, the air conditioner 6 originally prevents the inflow of hot air from the outside to the inside of the passage 4 so that the pressure in the passage is higher than the external air pressure to some extent. However, if the air pressure in the passage 4 rises above the set pressure due to some abnormality, as shown by the black arrow in FIG. The weight is overcome and the lid 16 is pushed upward about the hinge 15. As a result, the communication port 14 is opened, and a part of the air in the passage 4 escapes to the outside through the communication port 14 as indicated by the white arrow in FIG. As a result, an excessive pressure increase in the passage 4 is suppressed.

  In the computer system of this embodiment, when the non-flexible lid 16 closes the communication port 14 by its own gravity and the pressure in the passage 4 rises above the set pressure, the lid 16 is in the passage 4. Since the communication port 14 is opened by receiving the air pressure, it is possible to normally close the communication port 14 and suppress escape of unnecessary cooling air, and even when used for a long time, The closing performance of the lid 16 does not deteriorate.

Subsequently, other embodiments of the present invention will be sequentially described. In each embodiment, the same portions are denoted by the same reference numerals, and redundant description will be omitted.
FIG. 3 is a cross-sectional view corresponding to the AA cross section of FIG. 1 according to the second embodiment of the present invention.
In this embodiment, a communication port 14 is provided in the support housing 13 of the upper shield 10, and a lid 16 that closes the communication port 14 by its own gravity is attached to an edge of the communication port 14. The basic configuration is the same as that of the first embodiment, but the contacts 17a and 17b of the contact switch 17 are provided at the opening edges of the lid 16 and the communication port 14, and the contacts 17a and 17b provide the detection circuit 18. To the air volume control unit 19 of the air conditioner 6.
The air volume control unit 19 of the air conditioner 6 reduces the amount of cooling air blown from the air conditioner 6 when receiving a signal from the contact switch 17 indicating that the lid 16 has opened the communication port 14. .

  In this embodiment, the same basic effects as in the first embodiment can be obtained, and the contacts 17a and 17b of the contact switch 17 are provided on the opening edges of the lid body 16 and the communication port 14, There is an advantage that a pressure abnormality in the passage 4 can be detected without adding a dedicated pressure sensor. Further, in this embodiment, when the signal of the contact switch 17 is received and it is detected that the lid 16 has opened the communication port 14, the air volume control unit 19 reduces the air volume of the air conditioner 6, The increased pressure in the passage 4 can be quickly reduced.

FIG. 4 is a cross-sectional view corresponding to the AA cross section of FIG. 1 of the third embodiment of the present invention.
In this embodiment, a circular communication port 14A is provided in the support housing 13 of the upper shield 10, and the communication port 14A is closed by a spherical lid body 16A. Also in this embodiment, the lid body 16A closes the communication port 14A by its own weight, but the lid body 16A is not pivotally supported by the support housing 13 by the hinge 15 and is projected on the support housing 13. Irregular displacement is limited by the hemispherical guide wall 20 and the guide member 35 assembled conically with a plurality of metal wires. The lid body 16A of this embodiment is formed of an inflexible member such as metal or hard resin.
In the case of this embodiment, the same effects as those of the first embodiment can be obtained, and the air blowing direction from the communication port 14A can be distributed almost uniformly in the peripheral area.

FIG. 5 is a perspective view of the support housing 13 and the cover body 16B according to the fourth embodiment of the present invention, and FIG. 6 is a cross-sectional view corresponding to the AA cross section of FIG. 1 of the fourth embodiment. is there.
In this embodiment, a substantially elliptical communication port 14B is provided in the support housing 13 of the upper shield 10, and the communication port 14B is closed by an elliptical lid 16B. In the case of this embodiment, the lid 16 </ b> B has a rotating shaft 21 protruding at a position shifted from the center of gravity G, and the rotating shaft 21 is rotatably supported by a bearing portion 22 on the support housing 13. Yes. Also in this embodiment, the lid body 16B is formed of an inflexible member such as metal or hard resin.
This embodiment can obtain the same basic effects as those of the first embodiment.

FIG. 7 is a perspective view of the support housing 13 and the lid body 16C of the fifth embodiment of the present invention, and FIGS. 8 to 11 correspond to the AA cross section of FIG. 1 of the fifth embodiment. It is sectional drawing.
In this embodiment, a circular communication port 14 </ b> C is provided in the support housing 13 of the upper shield 10, and the communication port 14 </ b> C includes a first lid component 23, a second lid component 24, and a third lid component 25. The lid body 16C is closed. In the case of this embodiment, the first lid part 23, the second lid part 24, and the third lid part 25 are lid constituent parts. Also in this embodiment, the first, second, and third lid parts 23, 24, and 25 (lid body 16C) are formed of an inflexible member such as metal or resin.
The communication port 14C is provided with a tapered surface 14Cb whose upper side is expanded.

The first lid component 23 is formed in a disc shape and is disposed at the center of the entire lid body 16C. The second lid part 24 is formed in an annular shape, and is arranged on the outer peripheral side of the first lid part 23 so as to be fitted. The third lid part 25 is formed in an annular shape, and is arranged on the outer peripheral side of the second lid part 24 so as to be fitted. On the outer peripheral surface of the third lid component 25, a tapered surface 25 a is provided that expands in diameter on the upper side that can be fitted to the tapered surface 14 Cb of the communication port 14 </ b> C. Further, the outer peripheral surface of the first lid part 23 and the inner peripheral surface of the second lid part 24 are provided with mutually mating taper surfaces 23 a and 24 b whose diameter is increased on the upper side. Between the surface and the inner peripheral surface of the third lid part 25, taper surfaces 24a and 25b that can be fitted to each other and whose diameter is increased on the upper side are provided.
Reference numeral 40 in the drawing is assembled in a conical shape by a plurality of metal wires on the support housing 13 to restrict irregular movement of the first lid component 23, the second lid component 24, and the third lid component 25. It is a guide member to do.

  While the large air pressure does not act from the inside of the passage 4, as shown in FIG. 8, the first lid part 23 is fitted to the tapered surface 24 b on the inner peripheral side of the second lid part 24, and the second lid part 24 is The third lid component 25 is fitted to the tapered surface 14Cb of the communication port 14C on the inner circumferential side taper surface 25b of the third lid component 25. In this state, since the tapered surfaces 24b and 25b are shaped so that the upper side expands, the displacement regulating portion that relatively regulates the downward displacement of the first lid component 23 by the tapered surface 24b of the second lid component 24. The taper surface 25b of the third lid part 25 constitutes a displacement restricting portion that relatively restricts the downward displacement of the second lid part 24. Further, since the communication port 14C is provided with a tapered surface 14Cb that expands upward, the third lid component 25 is restricted from being displaced downward by the communication port 14C, and closes the communication port 14C in this state. .

  Moreover, about each weight of the 1st cover component 23, the 2nd cover component 24, and the 3rd cover component 25, the 3rd cover component 25 of the outermost periphery side is the heaviest, and the 1st cover component 23 of the center part is the lightest, The second lid part 24 has an intermediate weight between the first lid part 23 and the third lid part 25. In this embodiment, the set pressure at which the lid 16C opens the communication port 14C is set in three stages. Here, if the maximum set pressure is referred to as the first set pressure, the next highest set pressure is referred to as the second set pressure, and the minimum set pressure is referred to as the third set pressure, the lid 16C has the air pressure in the passage 4 When the pressure is equal to or higher than the first set pressure, the first lid part 23, the second lid part 24, and the third lid part 25 are individually lifted to open the communication port 14C, as shown in FIG. When the air pressure in the passage 4 is equal to or higher than the second set pressure and lower than the first set pressure, as shown in FIG. 10, the first lid part 25 is left with the heaviest third lid part 25 left on the communication port 14C. When the air pressure in the passage 4 is not less than the third set pressure and less than the second set pressure, as shown in FIG. Only the first lid component 23 opens the communication port 14C while leaving the third lid component 25 on the communication port 14C. That is, in this embodiment, the opening area of the communication port 14C is automatically switched in three stages according to the air pressure in the passage 4.

Therefore, in this embodiment, the same basic effects as those of the first embodiment can be obtained, and the flow rate of the cooling air released to the outside from the passage 4 is appropriately adjusted according to the pressure in the passage 4. Therefore, a decrease in cooling efficiency in the system can be minimized.
In the case of this embodiment, the tapered surface 25b of the third lid component 25 with the heaviest weight restricts the downward displacement of the second lid component 24 with the next heaviest weight, and the tapered surface 24b of the second lid component 24 is the most. Since the structure is configured to restrict the downward displacement of the lighter first lid component 23, the entire space is concentrated and the occupied space is reduced compared to the case where lids with different weights are distributed and installed in multiple places. can do.

FIG. 12 is a cross-sectional view corresponding to the AA cross section of FIG. 1 according to the sixth embodiment of the present invention.
In this embodiment, a communication port 14 is provided in the support housing 13 of the upper shield 10, and a lid body 16 </ b> D that closes the communication port 14 by its own gravity is provided above the communication port 14. As in the other embodiments described above, a housing 27 is provided on the upper surface of the support housing 13 to cover the upper side of the lid body 16D, and the lid body is disposed between the lower surface of the upper wall of the housing 27 and the lid body 16D. A biasing spring 28 for biasing 16D downward is interposed. The lid body 16D is also formed of an inflexible member such as metal or hard resin in this embodiment. Further, the urging spring 28 of this embodiment applies the force of the urging spring 28 to the lid body 16D that closes the communication port 14 by its own weight, and controls the behavior of the lid body 16D. The one with low is used.
In the figure, reference numeral 29 is a through hole formed on the side wall of the housing 27 to conduct the inside and outside of the housing 27.

  In this embodiment, the same basic effects as those of the first embodiment can be obtained, and the behavior of the lid body 16D can be achieved by the low-rigidity biasing spring 28 interposed between the housing 27 and the lid body 16D. And the opening characteristic of the communication port 14 can be set as desired.

FIG. 13 is a cross-sectional view corresponding to the AA cross section of FIG. 1 according to the seventh embodiment of the present invention.
The basic configuration of this embodiment is substantially the same as that of the sixth embodiment, and a biasing spring 28 that biases the lid 16D downward is provided in the housing 27. An electromagnetic solenoid 30 for controlling the set load of the urging spring 28 is further attached. Specifically, the electromagnetic solenoid 30 is provided with a rod portion 30a in which the forward / backward position of the tip portion is controlled by excitation of the solenoid, and the biasing spring 28 is controlled by controlling the protruding amount of the rod portion 30a. The support position of the end of the can be adjusted.

  In this embodiment, the same effect as that of the sixth embodiment can be obtained, and the set load of the biasing spring 28 can be arbitrarily adjusted by the electromagnetic solenoid 30, so that the behavior of the lid 16D and the communication port thereby can be obtained. There is a further advantage that the open characteristics of 14 can be adjusted as desired.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, when the upper part of the cooling air passage on the supply side of the accommodation rack is closed by the upper shield, the upper shield is closed by the communication port and the communication port by its own weight. Although the lid is provided, when the upper part of the hot air passage on the exhaust side of the storage rack is closed by the upper shield, the upper shield is similarly closed by the dead weight. A lid may be provided.

DESCRIPTION OF SYMBOLS 3 ... Storage rack 3b ... Air supply surface 3d ... Exhaust surface 4 ... Passage 6 ... Air conditioning apparatus 10 ... Upper shielding body 14 ... Communication port 16, 16A, 16B, 16C, 16D ... Cover body 17 ... Contact switch 28 ... Energizing Spring 30 ... Electromagnetic solenoid 100 ... Computer room air conditioning system

Claims (7)

A plurality of storage racks that house a plurality of devices and have an air supply surface for taking in cooling air and an exhaust surface for exhausting hot hot air,
A passage formed between the storage racks arranged in a plurality of rows;
An air conditioner that draws in hot air and sends out cooling air;
An upper shield that covers the upper part of the passage and separates the circulation part of the cooling air and the circulation part of the hot air, and
The upper shield is provided with a communication port that communicates the inside and outside of the passage, and a non-flexible lid that closes the communication port by gravity and opens the communication port by air pressure in the passage. A computer room air conditioning system.   The computer room air conditioning system according to claim 1, wherein the lid body has a structure in which a plurality of lid components having different weights and capable of independent lifting operations are combined.   3. The computer room according to claim 2, wherein the plurality of lid components include a displacement restricting portion that restricts a downward displacement of a relatively light component by a relatively heavy component. 4. Air conditioning system.   4. The contact switch for detecting that the opening of the lid is activated is provided between the lid and the opening edge of the communication port. 5. Computer room air conditioning system.   The said contact switch is connected to the ventilation control part of the said air conditioning apparatus, and the said ventilation control part controls the ventilation volume of the said air conditioning apparatus according to the detection signal of the said contact switch. Computer room air conditioning system.   The computer room air conditioning system according to claim 1, further comprising an urging spring that urges the lid downward.   The computer room air conditioning system according to claim 6, further comprising an electromagnetic solenoid that controls a set load of the biasing spring.

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