JP7292165B2 - Air-conditioning return air opening structure and air-conditioning system provided with the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a return air opening for taking in return air when air-conditioning a room having a system ceiling in which the structure of the ceiling is suspended so that it can be seen from below, and an air conditioning system having the same.

Fig. 7 shows an example of an air-conditioning system in which the air supplied from an air conditioner is introduced into the room in order to control the temperature of the room, and then the return air that is returned to the air conditioner is sucked from the ceiling. In the example of air-conditioning in a server room, it is common to stretch the ceiling and use the space in the ceiling as a return air chamber to return air to a floor-exhaust air conditioner. FIG. 7 further illustrates an air-conditioning system called a hot aisle/cold aisle type, which is often applied when high-density server racks are arranged in a row in a server room or the like. In a device room 1 (target room), a plurality of racks 3 containing devices 2 such as blade-type servers are installed in a row in a direction perpendicular to the plane of the paper. 4) are formed between them. Here, a total of four rows of racks 3 are formed in the equipment room 1 (rack rows 4a to 4d), and a total of five passages 5 (passages 5a to 5e) are provided in front of, behind and between the rack rows 4a to 4d. The case where it is formed is illustrated.

The devices 2 accommodated in each rack row 4 are installed in each rack 3 so that the front surfaces or the rear surfaces face each other. That is, the devices 2 housed in the rack rows 4a and 4c are arranged with their front surfaces facing right in the drawing, while the devices 2 housed in the rack rows 4b and 4d are arranged with their front surfaces facing left in the drawing. As a result, the rear surface of the device 2 faces the passages 5a, 5c and 5e, and the front surface of the device 2 faces the passages 5b and 5d.

A floor 6 of the equipment room 1 is configured as a raised floor, and an underfloor space 7 is formed below the floor 6 . The row of racks 4 and passages 5 are installed on the floor 6 . An air conditioner 8 is further installed in the equipment room 1, and cool air A1, which is conditioned air, is sent into the underfloor space 7 from here. Floor openings 9 serving as inlets for cool air A1 are provided in the floor 6 at positions facing the passages 5b and 5d. Cool air A1 sent into the underfloor space 7 from the air conditioner 8 is sent out from the floor opening 9 to the passages 5b and 5d.

On the other hand, the ceiling 10 in the equipment room 1 is provided with ceiling openings 11 as air return ports at positions facing the passages 5a, 5c, and 5e. The cold air A1 sent through the floor opening 9 into the passages 5b and 5d by the static pressure of the fan built into the air conditioner 8 is sent to the fan (not shown) provided in each rack 3 or the fan built into each device 2 (not shown). (not shown) is driven, it is sucked into each rack 3 facing each passage 5b, 5d, and is generated from the CPU or the like in the device 2 while passing through the inside of each device 2 arranged in each rack 3. It receives heat and becomes warm air A2, which flows into passages 5a, 5c, and 5e. Warm air A2 in passages 5a, 5c, and 5e is sucked as return air into ceiling space 12 above ceiling 10 through ceiling opening 11 provided above. The warm air A2 in the ceiling space 12 is sent to the air conditioner 8 by the suction pressure of the fan built into the air conditioner 8 using the ceiling space 12 as a return air chamber, and is cooled by the fan built into the air conditioner 8 as cold air A1 again. sent out.

Thus, in the equipment room 1, the aisles 5a, 5c, 5e set as hot aisles through which the warm air A2 circulates, and the aisles 5b, 5d set up as cold aisles through which the cold air A1 circulates are arranged in each row of racks 4. Air is circulated from the cold aisles 5b, 5d to the hot aisles 5a, 5c, 5e through each rack 3 positioned between the hot aisles 5a, 5c, 5e and the cold aisles 5b, 5d. , and exhaust heat from the equipment 2 accommodated in each rack 3 is recovered.

In this example, a floor-mounted air conditioner 8 is provided on the floor 6, and cool air A1 is supplied to the cold aisles 5b and 5d through the underfloor space 7 from here. There are various other types of air conditioning systems. For example, there are models that do not have a raised floor and models that have an air conditioner at a different position.

For example, Japanese Unexamined Patent Application Publication No. 2002-100002 describes a technique related to this type of air conditioning system.

JP 2011-85267 A

In the air conditioning system as described above, the amount of return air (warm air A2) sucked into the ceiling opening 11 may be manipulated in order to adjust the cooling efficiency of the equipment 2 . In particular, with regard to the unevenness of the indoor heat generation distribution due to the difference in the heat generation amount of each device 2 distributed and arranged in the room, in order to send more cold air A1 to the place where the heat generation amount is large, return air above it It is necessary to adjust the distribution of the suction amount of Since the heat generated from the devices 2 accommodated in the rack 3 is not necessarily uniform, it is necessary to supply a large amount of cold air A1 to the devices 2 that generate a large amount of heat in order to cool them efficiently. In the air conditioning system shown in FIG. 7, the amount of cold air A1 supplied to a certain device 2 depends on the amount of warm air A2 sucked through the ceiling opening 11 located in the vicinity of the device. When cold air A1 is distributed approximately evenly in the cold aisle, the amount of cold air A1 supplied to a certain equipment 2 depends on the amount of warm air A2 sucked into the hot aisle on the opposite side of the equipment 2. Because it changes.

The intake amount of warm air A2 can be adjusted by the opening area of the ceiling opening 11 provided in each of the hot aisles 5a, 5c, and 5e. That is, a mechanism capable of adjusting the opening area is installed in each ceiling opening 11, and the opening area of the ceiling opening 11 is increased near the equipment 2 that generates a large amount of heat, and the opening area is increased near the equipment 2 that generates a small amount of heat. should be set smaller.

Conventionally, as a mechanism for adjusting such an opening area, for example, a universal grille air valve having lattice-shaped blades is often used. A product called an H-shaped (horizontal) universal grill whose blades are oriented horizontally is generally used. The lower surface of the flat box-shaped housing is an opening (return air port), a louver is provided at the position of the return air port, and a shutter that can be opened and closed is provided on the upper surface, which is the back side when viewed from the return air port. . However, such instruments are expensive due to the cost involved in bending the steel plate. In particular, in a server room or the like in which a large amount of air is required for cooling, a large number of H-shaped universal grills are required, and a huge amount of cost is incurred for installation. In addition, the H-type universal grille is heavy and requires a separate hanging structure for the air valve to be installed on the ceiling 10, increasing the construction cost and construction period. Therefore, depending on the structure of the ceiling 10, there is a problem that it is difficult to increase the opening area of the return air port of the air conditioning system as a whole. Also, the operation of opening and closing the shutter on the far side is troublesome.

SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to provide an air-conditioning return port structure and an air-conditioning system having the same, which can easily adjust the degree of opening by means of a lightweight opening/closing mechanism.

The present invention includes a fixed plate formed in a mountain shape and provided with a fixed side vent on a slope; A movable plate that is stacked so as to be in contact with the slope of the plate, and that has a movable side vent at a position on the slope corresponding to the fixed side vent of the fixed plate; and a slide that is provided along the crease of the fixed plate. a hole, a mounting hole provided at a position facing the slide hole at a fold of the movable plate, and a fastener that penetrates the slide hole and the mounting hole and tightens the movable plate to the fixed plate. Equipped with an opening and closing mechanism comprising It relates to the air-conditioning return air port structure characterized by being installed in the

In the air conditioning return air port structure of the present invention, the fastener includes an operation knob projecting downward from the opening and closing mechanism, and the operation knob allows the movable plate to be tightened and slid from the lower surface of the ceiling structure. It is preferable to be configured so that it can be operated from the target room side.

The air-conditioning return air opening structure of the present invention may include a stopper plate that closes the end surface of the fixing plate in the direction along the fold.

In the air-conditioning return air opening structure of the present invention, the ceiling structural members on which the ends of the bottom of the slope of the fixed plate are placed may be two parallel pieces.

Further, the present invention relates to an air conditioning system comprising the air conditioning return port structure described above.

ADVANTAGE OF THE INVENTION According to the return air opening structure of the air conditioning of this invention, and an air conditioning system provided with the same, the outstanding effect that an opening degree can be adjusted simply by a lightweight opening-and-closing mechanism can be produced.

It is a perspective view showing an example of the form of the opening-and-closing mechanism used for implementation of the present invention. 1 is an exploded perspective view showing an example of a form of an opening/closing mechanism used for carrying out the present invention; FIG. It is a front cross-sectional view showing an example of the form of the opening-and-closing mechanism used for implementation of this invention. FIG. 2 is a perspective view showing an example of the form of a ceiling to which the air-conditioning return air port structure according to the embodiment of the present invention is applied; FIG. 10 is a perspective view showing another example (second embodiment) of the form of the ceiling to which the air-conditioning return air port structure according to the embodiment of the present invention is applied; FIG. 10 is a perspective view showing another example (third embodiment) of the form of the ceiling to which the air-conditioning return air port structure according to the embodiment of the present invention is applied; 1 is a conceptual diagram showing an example of an air conditioning system; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show an example of the form of an opening/closing mechanism used for carrying out the present invention. The opening/closing mechanism 13 shown here can be applied to the ceiling opening 11 of an air conditioning system as shown in FIG. 7, for example. In the following, the case where the present invention is applied to the air conditioning system shown in FIG. 7 is assumed as one of specific examples, and will be described with reference to FIG. 7 as necessary. The present invention can be applied to any air conditioning system that requires adjustment of the degree of opening at the mouth.

The opening/closing mechanism 13 includes a fixed plate 14 and a movable plate 15 which are two plate-shaped metal members. The fixing plate 14 is a plate-like member that is bent into a mountain shape with an obtuse angle. 14a) is placed on the edge of the ceiling opening 11 (see FIGS. 3 and 7) to be supported by the ceiling opening 11. As shown in FIG.

A plurality of ventilation holes (fixed side ventilation holes) 14b are opened on the slope of the fixed plate 14 . An elongated slide hole 14c is opened along the crease forming the upper end of the fixed plate 14. As shown in FIG.

The movable plate 15 is a plate-like member that is bent into a mountain shape with an obtuse angle. direction) and left-right direction (horizontal direction perpendicular to the fold) are set smaller than the fixed plate 14 . The movable plate 15 is superimposed on the upper side of the fixed plate 14 so that the creases of the movable plate 15 are parallel to the creases of the fixed plate 14 and the skirt portions 15a corresponding to the lower sides of both slopes are in contact with the slopes of the fixed plate 14. be done. A plurality of ventilation holes (movable side ventilation holes) 15b are opened on the slope of the movable plate 15 at positions corresponding to the fixed side ventilation holes 14b provided on the slope of the fixed plate 14 .

At the fold of the movable plate 15, a mounting hole 15c is opened at a position facing the slide hole 14c of the fixed plate 14. As shown in FIG. , a fastener 16 such as a lock nut is attached so as to pass through the slide hole 14c of the fixed plate 14, and the movable plate 15 is tightened to the fixed plate 14 by tightening the fastener 16 up and down. It is now supported. The angle formed by both slopes of the movable plate 15 is set smaller than the angle formed by both slopes of the fixed plate 14 as described above, and the horizontal dimension is set smaller than that of the fixed plate 14. Therefore, the fixed plate 14 When the movable plate 15 is placed on top of the movable plate 15, the bottom portion 15a of the movable plate 15 is in contact with the inclined surface of the fixed plate 14, and the fold of the movable plate 15 is positioned above the fold of the fixed plate 14 as shown in FIG. do. When the fastener 16 passing through the mounting hole 15c of the movable plate 15 and the slide hole 14c of the fixed plate 14 is tightened vertically, the fold of the movable plate 15 is fixed with the bottom portion 15a of the movable plate 15 as a fulcrum. A force is applied to the fold of the movable plate 15 in a direction approaching the fold of the plate 14 . As a result, the movable plate 15 is deformed in such a direction that the slopes spread toward each other, and an elastic force is generated in the direction of returning to the original shape (the direction in which the slopes approach each other). Due to this elastic force, the movable plate 15 contacts the fixed plate 14 so as to be pressed.

At the lower part of the fastener 16, an operation knob 16a is provided so as to protrude from the fold of the fixing plate 14 to the lower side of the opening/closing mechanism 13. This operation knob 16a is grasped from the inside of the room on the lower surface of the ceiling structure. , the movable plate 15 can be moved along the fold direction with respect to the fixed plate 14 by sliding along the slide hole 14c. When the position between the fixed plate 14 and the movable plate 15 is moved in this way, the position of the movable side vent 15b with respect to the fixed side vent 14b is changed, thereby adjusting the opening area of the opening/closing mechanism 13 as a whole. can. That is, the larger the overlap between the fixed side vent 14b and the movable side vent 15b, the larger the opening area, and the smaller the overlap between the fixed side vent 14b and the movable side vent 15b, the smaller the opening area. If such an opening/closing mechanism 13 is provided in the ceiling opening 11 of an air-conditioning system as shown in FIG. 7, the opening area of the ceiling opening 11 can be easily changed by simply sliding the operation knob 16a, and the equipment 2 located nearby can be adjusted. cooling amount can be adjusted.

Here, the tightening amount of the fastener 16 can also be operated by this operation knob 16a. Therefore, when it is desired to change the opening area after the fastener 16 is once tightened to fix the movable plate 15 to the fixed plate 14, the operation knob 16a is operated from below the fixed plate 14 to loosen the tightening. Then, the movable plate 15 is slid to adjust the opening area, and then the operation knob 16a is operated again to tighten it.

Further, in the opening/closing mechanism 13 shown here, the movable plate 15 is pressed against the fixed plate 14 by using elastic force, which has the effect of suppressing the vibration of the movable plate 15 . In the operation of an air-conditioning system, vibration often occurs due to the operation of the equipment that constitutes the system. As a result, abnormal noise may be generated between the movable plate 15 and the fixed plate 14, the connection between the two may be loosened, or a positional deviation may occur between the two, resulting in a change in the opening area. However, if the movable plate 15 is pressed against the fixed plate 14 by utilizing the elastic force as described above, the vibration is suppressed and problems such as abnormal noise, looseness, and misalignment are prevented from occurring. be done. On the other hand, the movable plate 15 is not completely fixed to the fixed plate 14, and the tightening by the fastener 16 can be operated in a timely manner using the operation knob 16a, so the opening adjustment operation may become difficult. do not have.

Although illustration is omitted, it is also possible to reverse the stacking order of the fixed plate and the movable plate, and to provide the movable plate below the fixed plate. In that case, the angle formed by both slopes of the movable plate should be larger than the angle formed by both slopes of the fixed plate. When the crease of the fixed plate and the crease of the movable plate are tightened up and down with fasteners, the movable plate is deformed so that the slopes of the movable plate approach each other, and the plate returns to its original shape (the slopes move away from each other). direction) is generated.

FIG. 4 shows an example of the form of the ceiling 10 and the ceiling opening 11 provided with the opening/closing mechanism 13 as described above. In the case of the example shown here, the ceiling 10 is configured as a grid-type system ceiling. In the vertical case, the grid is surrounded by the ceiling structure material 10a and the side edge of the ceiling panel), and the ceiling panel and other ceiling equipment can be installed so as to fit into each grid 10b. It's like The ceiling structural material 10a is a building material sold as a member for system ceilings under the name of T bar, for example, and is suspended from the upper floor slab or roof by a hanging tool 10c to form a ceiling base, and a grid 10b. The entire ceiling 10 is supported together with ceiling panels and other fixtures installed in the ceiling.

Then, the ends of the skirts (slope skirts) 14a of the fixed plate 14 in the opening/closing mechanism 13 are placed on two (a plurality of) parallel ceiling structural members 10a, and installed in the equipment room (target room) 1. It's like FIG. 4 shows an opening/closing mechanism 13 having an opening area adjustment function by setting the front, rear, left, and right dimensions of the opening/closing mechanism 13 as shown in FIGS. It can be easily installed on the ceiling 10 having such a structure.

Here, when installing the opening/closing mechanism 13 on the ceiling 10, an additional hanger or the like is unnecessary. When installing some equipment on the grid 10b, if the weight of the ceiling 10, including the weight of the equipment, exceeds the load capacity of the hanger 10c, a hanger or the like (not shown) may be used to directly hang the equipment. However, in the case of the opening/closing mechanism 13 as shown in FIGS. 1 to 3, since it is a lightweight device made up of only two metal plates stacked, it is necessary to add a hanging tool or the like. There is no need to worry. In addition, since a large number of opening/closing mechanisms 13 can be installed even in the ceiling 10 having a structure with a small load resistance, the opening area of the return air port for the entire air conditioning system can be easily secured.

Further, the opening/closing mechanism 13 as described above can be manufactured inexpensively and easily simply by forming two plates into a mountain shape and providing a ventilation port, a slide hole, and a mounting hole, and the cost required for installation is very low. Furthermore, when transporting a plurality of opening/closing mechanisms 13, the fixed plates 14 and the movable plates 15 can be packed together in a compact manner. can also be reduced.

When the fixed plate 14 and the movable plate 15 having a mountain shape are installed on the grid 10b composed of the ceiling structure material 10a as shown in FIG. Although it can be brought into contact with the material 10a without a gap, the two sides perpendicular to the fold are lifted from the ceiling structural material 10a. Here, as shown in FIG. 3, if the height from the surface on which the edge of the skirt portion 14a of the ceiling structural member 10a is placed to the upper end is sufficient, the ceiling structural member 10a itself closes the end face. If the height of the ceiling structural member 10a is not sufficient, a gap through which air can flow is generated at the end surface, and it is possible that the opening adjustment by overlapping the fixed plate 14 and the movable plate 15 may not function well. be done. In such a case, for example, as indicated by the dashed line in FIGS. 1 and 2, it is preferable to separately provide a stop plate 17 for blocking the end face positioned along the side perpendicular to the folding line of the fixing plate 14 .

The stop plate 17 is a member that closes both end faces in the direction along the crease of the fixing plate 14 . It is sufficient for the stop plate 17 to cover at least the obtuse triangular portion sandwiched between the slopes on the end surface of the fixing plate 14, but it may extend above the slopes. If such a stop plate 17 is provided on the end face, it is possible to reliably block air circulation through the end face and to achieve good opening degree adjustment.

For convenience of explanation, the inclination angles of the slopes of the fixed plate 14 and the movable plate 15 are shown to be large (the angle formed by the slopes is small) in FIGS. It is preferable to set the inclination angle as small as possible (the angle between the slopes is close to 180°) within the range in which an appropriate elastic force can be obtained. The smaller the tilt angle, the smaller the height of the opening/closing mechanism 13 as a whole, the smaller the area of the end surface perpendicular to the fold, and the less air flow through the outer end surface. Also, the difference between the slope of the fixed plate 14 and the slope of the movable plate 15 should be set as small as possible within the range in which the movable plate 15 can obtain an appropriate elastic force. This is because the fixed plate 14 and the movable plate 15 are brought close to each other to make the gap between the fixed plate 14 and the movable plate 15 as narrow as possible, thereby suppressing the circulation of air in the gap and effectively adjusting the flow rate by the opening area.

FIG. 5 shows a second embodiment of the present invention in which an opening/closing mechanism 13 is provided on a ceiling 10 having a structure different from that of FIG. In the example shown here, the ceiling structural members 10a do not form a grid, and ceiling panels and other devices are installed between the parallel ceiling structural members 10a. When the opening/closing mechanism 13 is provided in the ceiling 10 having such a structure, if the opening/closing mechanism 13 is arranged along the folds of the fixed plate 14 and the movable plate 15 in the longitudinal direction (the direction in which the ceiling structural member 10a extends), 1. Stopping plate 17 as shown in FIG. 2 is unnecessary.

Further, FIG. 6 shows a third embodiment of the present invention in which an opening/closing mechanism 13 is provided on a ceiling 10 having a different structure. In the case of the ceiling 10 shown here, the ceiling structural members 10a are arranged vertically and horizontally. A ceiling panel or the like is fitted between the ceiling structural members 10a on the lower side. In the case of the ceiling 10 having such a structure, for example, as shown here, an auxiliary structural member 10d is stretched perpendicular to the ceiling structural member 10a on the lower side to form a rectangular frame together with the ceiling structural member 10a. An opening/closing mechanism 13 having suitable dimensions can be installed. A stop plate 17 (see FIGS. 1 and 2) may be provided as necessary. Incidentally, if there is concern about the suspension strength, a hanging tool or the like (not shown) may be added to the auxiliary structural member 10d or the nearby ceiling structural member 10a. Thus, the opening/closing mechanism 13 can be installed on ceilings 10 having various structures.

As described above, the air-conditioning return air port structure of the above-described embodiment includes the fixed plate 14 formed in a mountain shape and provided with the fixed side vent 14b on the slope, and the fixed plate 14 formed in a mountain shape and folded into the fixed plate 14. The meshes are separated from each other and overlapped in parallel, and the bottom portion 15a is overlapped so as to be in contact with the slope of the fixed plate 14, and the movable side ventilation port 15b is formed on the slope of the fixed plate 14 at a position corresponding to the fixed side ventilation port 14b. A movable plate 15 provided, a slide hole 14c provided along the fold of the fixed plate 14, a mounting hole 15c provided at a position facing the slide hole 14c at the fold of the movable plate 15, and a slide hole 14c. and a fastener 16 that penetrates the mounting hole 15c and fastens the movable plate 15 to the fixed plate 14, and the upper floor floor slab for the ceiling configuration of the equipment room (target room) 1 Alternatively, it is installed in the machine room (target room) 1 with the end of the bottom portion (slope bottom portion) 14a of the fixing plate 14 placed on the ceiling structural member 10a that is hung from the roof. In this way, by moving the position between the fixed plate 14 and the movable plate 15, the position of the movable side vent 15b with respect to the fixed side vent 14b is changed, thereby opening the opening and closing mechanism 13 as a whole. Area can be adjusted. Further, by pressing the movable plate 15 against the fixed plate 14 using elastic force, it is possible to suppress vibration and prevent problems such as abnormal noise, loosening, and positional deviation. In addition, the open/close mechanism 13 can be made lightweight, and the opening area of the return air port of the entire air conditioning system can be easily ensured. In addition, the opening/closing mechanism 13 can be manufactured inexpensively and easily, requires little installation cost, and can be packed compactly, so that the volume during transportation can be reduced, and the labor and expense required for transportation can be reduced.

In addition, in the air conditioning return air port structure of the embodiment, the fastener 16 is provided with an operation knob 16a that protrudes downward from the opening/closing mechanism 13, and the operation knob 16a can be used to tighten and slide the movable plate 15. It is configured so that it can be operated from the machine room side (target room side) from the bottom surface of the. In this way, by operating the operation knob 16a from the lower side of the opening/closing mechanism 13, the opening area of the opening/closing mechanism 13 as a whole can be easily adjusted.

In addition, the air-conditioning return air port structure of the embodiment may be provided with a stop plate 17 that closes the end face in the direction along the folding line of the fixing plate 14. By doing so, the flow of air through the end face is prevented. It is possible to reliably close and achieve good opening degree adjustment.

Further, in the air-conditioning return air opening structure of the embodiment, the ceiling structural members 10a on which the ends of the skirts (slope skirts) 14a of the fixing plate 14 are placed may be two parallel pieces. Then, the opening/closing mechanism 13 can be easily installed, and the cost required for installation can be reduced.

Further, the above-described embodiment includes the air-conditioning return air port structure described above.

Therefore, according to each of the embodiments described above, the opening degree can be easily adjusted by the lightweight opening and closing mechanism.

It should be noted that the air-conditioning return port structure and the air-conditioning system including the same according to the present invention are not limited to the above-described embodiments. For example, in the above-described embodiment, the case where the present invention is applied to a hot aisle/cold aisle air conditioning system was exemplified. The present invention can be applied regardless of the type of space or the type of space. For example, an office ceiling may be provided with a return vent structure as described above. The target room is not limited to the machine room, and may be another room. In addition, it goes without saying that various modifications can be made in carrying out the present invention without departing from the gist of the present invention.

1 Machine room (target room)
13 Open/close mechanism 14 Fixed plate 14a Bottom (bottom of slope)
14b Fixed-side vent 14c Slide hole 15 Movable plate 15a Bottom 15b Movable-side vent 15c Mounting hole 16 Fastener 16a Operation knob 17 Stop plate

Claims (5)

a fixed plate formed in a mountain shape and provided with a fixed side vent on the slope;
Formed in a mountain shape, the folds of the fixing plate are spaced apart and overlapped in parallel, and the bottom part is overlapped so that it contacts the slope of the fixing plate, and is on the slope corresponding to the fixed side vent in the fixing plate. A movable plate provided with a movable side vent at the position of
a slide hole provided along the fold of the fixing plate;
a mounting hole provided at a position facing the slide hole at the fold of the movable plate;
an opening and closing mechanism including a fastener that penetrates the slide hole and the mounting hole and tightens the movable plate to the fixed plate;
An air conditioner characterized in that it is installed in the target room by placing the end of the sloping bottom of the fixed plate on the upper floor floor slab or the ceiling structural material that is hung from the roof for the purpose of constructing the ceiling of the target room. return air opening structure. The fastener has an operation knob projecting downward from the opening/closing mechanism, and is configured so that the operation knob can be used to operate the fastening and sliding of the movable plate from the lower surface of the ceiling structure from the target room side. The air-conditioning return air opening structure according to claim 1, characterized in that: 3. The air-conditioning return port structure according to claim 1, further comprising a stopping plate for blocking an end face of the fixing plate in a direction along the fold. The ceiling structural members on which the ends of the bottom of the slope of the fixed plate are placed are two parallel pieces;
The air-conditioning return port structure according to any one of claims 1 to 3, characterized by: An air conditioning system comprising the air conditioning return port structure according to any one of claims 1 to 4.

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