JP6516853B2 - Indoor unit - Google Patents

Description

  The present invention relates to an indoor unit, and more particularly to the structure of a fan casing mounted on the indoor unit.

  For example, in a large-capacity air conditioner disposed in a computer room or the like, the rate at which the power consumption of the indoor unit fan motor can be larger than the power consumption of the entire air conditioner is larger than that of a general household air conditioner. Therefore, the power consumption of the indoor unit fan motor is reduced by using a turbo fan with high blowing efficiency as a centrifugal fan generally deployed. For example, while the fan efficiency of the sirocco fan is about 45 to 60%, the fan efficiency of the turbofan is about 65 to 80%.

  Since a sirocco fan can realize a higher blowing efficiency than a box-like shape when the shape of the fan casing is a scroll shape, it is general to adopt a scroll-shaped fan casing. On the other hand, in the case of a turbo fan, since the size of the fan casing has a greater influence on the fan efficiency than the shape of the fan casing, a box-shaped fan casing is adopted to save energy and increase the efficiency of the entire indoor unit. It has been realized. For example, in the indoor unit structure of patent document 1, the box-shaped shape is employ | adopted for the fan casing of the turbo fan. In this structure, the power consumption of the indoor unit fan motor can be reduced and the blowing efficiency can be improved by increasing the ratio of the fan casing to the projected area inside the indoor unit.

  By the way, when installing an indoor unit, the piping provided in the inner side of the indoor unit is brazed to the piping outside the apparatus and connected. The operation of brazing the piping involves heating the piping on the inner side of the indoor unit from the front of the indoor unit with a gas welding torch. In order to enable such work, a work space is generally provided between the fan casing and the inner surface of the indoor unit.

JP, 2014-119126, A

  When the indoor unit is provided with a turbo fan as in Patent Document 1 and the like, a work space is provided adjacent to the box-shaped fan casing. When the fan casing is enlarged to improve the blowing efficiency of the turbo fan, the indoor unit is provided with an area occupied by the fan casing and an area occupied by the work space, and the entire indoor unit becomes large. .

  In order to miniaturize the indoor unit, it is conceivable to reduce the work space provided in the indoor unit. However, a control box fixed from the outside of the indoor unit is generally arranged to relay the power supply line before the piping brazed to the outside piping, and work from the front of the indoor unit If you do, the view will be blocked by the control box. If brazing can be performed from the side of the indoor unit, the control box will not block the view, but a construction and service space must be provided for the operator who handles the gas welding torch. In this case, although the entire indoor unit can be miniaturized, it occupies a large area as an installation place including the construction and service space, and it is difficult to arrange in a limited space.

  As described above, it is difficult to achieve both the improvement of the air blowing efficiency and the downsizing of the indoor unit, and there is a limit to reducing the installation area while maintaining the air blowing efficiency.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide an indoor unit capable of reducing the occupied footprint as much as possible and maintaining the blowing efficiency.

The indoor unit according to the present invention has a main body provided with a suction port on the upper surface and a blowout port on the lower surface, and a fan housed in the main body and forming an air path from the suction port to the blowout port A fan casing for accommodating the fan, a heat exchanger provided in the air passage, piping provided between the fan casing and the inner side surface of the main body and connected to the heat exchanger; The fan casing is a box-shaped casing formed of a plurality of plates , and an air inlet formed on the upper surface, an air outlet formed on the lower surface, and the plurality of plates , an opening was made form a portion of a plate forming the adjacent side, covering the opening, comprising closing a plate removable, the said pipe, in a state in which the closing plate is removed, the Placed at a position visible through the opening It has been.

  According to the indoor unit of the present invention, the opening and the removable closing plate are provided on the fan casing so that the opening can be removed by removing the closing plate when the indoor unit is installed. The space inside the fan casing can be used as a work space. Therefore, there is no need to provide a work space inside the indoor unit, the installation area occupied by the indoor unit can be kept small, and the size of the fan casing can be maintained, so that the fan blowing efficiency can also be maintained. it can.

It is a perspective view of the internal structure of the indoor unit which concerns on embodiment. It is a disassembled perspective view of the fan casing of the indoor unit of FIG. It is a fragmentary perspective view of the attachment structure of the control box in the indoor unit of FIG. It is a disassembled perspective view of the attachment structure of the control box in the indoor unit of FIG. It is a perspective view explaining installation work of the indoor unit of FIG. It is a modification of the fan casing which concerns on embodiment.

Embodiment.
The indoor unit according to the present embodiment is, for example, a floor-mounted lower-blowing indoor unit installed in a computer room or the like, and includes an evaporator of the indoor unit, an expansion valve serving as expansion means, a compressor not shown, A valve and a condenser are disposed outside the machine, and are sequentially connected by a refrigerant pipe to form a refrigerant circuit. FIG. 1 is a perspective view showing the internal structure of the indoor unit 100 according to the present embodiment. As shown in FIG. 1, the indoor unit 100 according to the present embodiment includes an inlet 1, an outlet 2, a main control box 3, a control box 4, an evaporator 5, a main drain pan 6, and a sub drain pan. 7 and a fan casing 9. The evaporator 5 is an example of a heat exchanger that functions as a heat source on the indoor side. These internal configurations are accommodated in an outer shell formed by a frame and an exterior panel (not shown) to constitute the indoor unit 100 main body. A heat insulating material is attached to the exterior panel to prevent the heat in the cabin including the piping 10 of the indoor unit 100 from being transmitted to the outside. In the following description, a region indicated by a dotted circle A is the right side and the front side of the lower portion of the indoor unit 100.

  The inlet 1 and the outlet 2 are air inlets and outlets, and form an air path from the inlet 1 to the outlet 2 by the drive of a fan 19 such as a turbo fan housed in a fan casing 9. The evaporator 5 is disposed in an air passage generated by the fan 19 immediately below the suction port 1 and has an inverted V-shape in a cross-sectional view inclined with respect to the air passage. The evaporator 5 causes the refrigerant to flow through a refrigerant pipe (not shown) inside the evaporator 5, and generates the harmonized air by heat exchange between the refrigerant and the air passing therethrough. The refrigerant pipe of the evaporator 5 is connected to the outside of the indoor unit 100 through the pipe 10 which constitutes a part of the refrigerant circuit, and the refrigerant circuit is configured.

  A heat insulating material or the like is disposed around the portion where the refrigerant pipe is joined to the pipe 10, and prevents condensation that is likely to be generated by air that has been heat-exchanged by the evaporator 5 and has become low temperature. Further, in order to collect drain water generated by condensation, a sub drain pan 7 is provided along the side face of the evaporator 5 on the side face of the evaporator 5, and a main drain pan 6 is provided on the lower end of the evaporator 5. Is arranged. The sub drain pan 7 receives drain water splashed from the evaporator 5, and the main drain pan 6 receives drain water flowing down from the evaporator 5. The collected drain water is drained to the outside of the indoor unit 100 by the drain hose 8 connected to the bottom surface of the main drain pan 6.

  The main control box 3 is provided below the suction port 1. The main control box 3 is connected to a power supply line (not shown) relayed by the control box 4. The power supply line is drawn into the indoor unit 100 from the outside of the indoor unit 100 through the bottom surface. The control box 4, the pipe 10, and the drain hose 8 are connected to the external structure of the indoor unit 100 and thus are provided close to each other.

  FIG. 2 is an exploded perspective view of the fan casing 9 of the indoor unit 100 of FIG. 1, and a portion indicated by a dotted circle A corresponds to a region within the dotted circle of FIG. 1. As shown in FIG. 2, the box-shaped fan casing 9 accommodates a fan 9 in an enclosure 9 a having an air inlet 11 and an air outlet (not shown), and a fan 19 therein. Air is drawn in from the air inlet 11 at the top of the fan casing 9 by the drive of the fan 19 and blown out from the air outlet to form an air path from the inlet 1 to the outlet 2 inside the indoor unit 100 Be done. Openings 13a and 13b are respectively provided on the right side and the front side forming the box-shaped fan casing 9, and each of the openings 13a and 13b is closed by a removable closing plate 12a or 12b. There is. The closing plates 12a and 12b are screwed and fixed to the fan casing 9 so as to cover the openings 13a and 13b. In FIG. 2, the opening 13b is provided on the right side of the fan casing 9, but the opening 13b may be provided on the side adjacent to the pipe 10, and the pipe 10 is adjacent to the left side. For this purpose, the opening 13b may be provided on the left side. Moreover, in FIG. 1, although the two fan casings 9 are arrange | positioned adjacently, the number of the fan casings 9 is not limited, and may be only one.

  FIG. 3 is a partial perspective view of the mounting structure of the control box 4 in the indoor unit 100 of FIG. FIG. 3 is a view looking from the left front of the indoor unit 100 in FIG. 1 to the direction of the region indicated by the dotted circle A, and the exterior panel covering the front of the indoor unit 100 and the blocking plates 12a and 12b of the fan casing 9 Indicates a removed condition. As shown in FIG. 3, the control box 4 attached to the inner side surface of the indoor unit 100 and the pipe 10 behind the control box 4 are disposed adjacent to the fan casing 9 having the openings 13a and 13b. There is. The position at which the openings 13a and 13b are formed is not particularly limited, as long as the piping 10 disposed behind the control box 4 can be viewed through the opened openings 13a and 13b. Good. The closing plates 12 a and 12 b removed from the fan casing 9 can be temporarily placed in a temporary storage space formed on the inner side surface of the indoor unit 100.

  FIG. 4 is an exploded perspective view of the mounting structure of the control box 4 in the indoor unit 100 of FIG. As shown in FIG. 4, the control box 4 is fixed to the inner side surface of the frame 15 via an intermediate sheet metal 16. A screw 17 a screwed from the inside of the indoor unit 100 fixes the mounting plate 4 a extending from the control box 4 and the intermediate sheet metal 16. 17 b screwed from the outside of the indoor unit 100 fixes the intermediate sheet metal 16 to the square plate 15 a of the frame 15. The control box 4 is screwed to the intermediate sheet metal 16, and the intermediate sheet metal 16 is screwed from the outer surface of the square plate 15 a of the frame 15 so that the control box 4 is fixed to the inside of the frame 15. That is, the control box 4 to which the intermediate sheet metal 16 is screwed is fixed to the inside of the frame 15 by the intermediate sheet metal 16 being screwed from the outside of the frame 15, and directly screwed from the outside of the frame 15. Not.

  Then, the manufacturing process of the indoor unit 100 is demonstrated, referring FIGS. 1-4. In the manufacturing process of the indoor unit 100, first, an internal structure excluding the control box 4 of the indoor unit 100 shown in FIG. 1 is constructed, and a frame 15 surrounding the internal structure is assembled as a framework of the indoor unit 100. At this time, the openings 13a and 13b of the fan casing 9 are closed by the closing plates 12a and 12b. The intermediate sheet metal 16 is screwed to the control box 4 in advance with a screw 17a. Then, the intermediate sheet metal 16 to which the control box 4 is fixed is disposed inside the frame 15 on the right side surface of the indoor unit 100, and is fixed from the outside of the frame 15 by screws 17b. Thereafter, the exterior panel is attached to the outside of the assembled frame 15, and the exterior panel on each side and the frame 15 are screwed from the outside and fixed, and the frame 15 and the exterior panel form the outer shell of the main body. The indoor unit 100 accommodating the internal structure of 1 is completed.

  Next, the installation work of the indoor unit 100 performed at the installation site of the shipping destination of the manufactured indoor unit 100 will be described. FIG. 5 is a perspective view for explaining the installation work of the indoor unit 100 of FIG. 1, and shows a state when the indoor unit 100 is viewed from above the left front. As shown in FIG. 5, when performing the installation work, the exterior panel (not shown) on the front of the indoor unit 100 is removed, and the closing plates 12a and 12b of the fan casing 9 are removed to open the openings 13a and 13b. . The blocking plates 12 a and 12 b of the removed fan casing 9 can be temporarily placed on the inner side surface of the main body adjacent to the pipe 10. Further, the screw 17 a for fixing the intermediate sheet metal 16 fixed to the frame 15 and the control box 4 from the inside is released, and the control box 4 is removed from the intermediate sheet metal 16. Thus, a space is created in a part of the inside of the fan casing 9 and in the area adjacent to the fan casing 9 inside the indoor unit 100.

  Next, the pipe 10 is connected to an external refrigerant pipe that constitutes a refrigerant circuit. Since the refrigerant in the low temperature, high temperature, low pressure, high pressure flows in the refrigerant circuit, the piping 10 of the indoor unit 100 and the external refrigerant piping that is a part of the refrigerant circuit are welding devices such as the gas welding torch 14. It must be connected securely by the brazing used. In the brazing, the gas welding torch 14 is brought close to the pipe 10 from the space formed in the inside and the adjacent area of the fan casing 9 in which the openings 13a and 13b are opened. Then, the gas welding torch 14 is moved around the pipe 10 with a diameter of 300 mm and in the range of 90 to 120 °, and the flame of the gas welding torch 14 heats the pipe 10. At the time of heating, the blocking plates 12 a and 12 b removed from the fan casing 9 are disposed on the inner side surface of the indoor unit 100. When the flame of the gas welding torch 14 contacts the inner side surface of the indoor unit 100 and directly contacts the heat insulating material of the exterior panel, the exterior panel may spread fire. However, if temporarily placed on the inner side surface of the indoor unit 100, the blocking plates 12a and 12b function as curing members, and the heat insulating material of the exterior panel can be prevented from spreading directly in contact with the flame of the gas welding torch 14. . Also, the pipe 10 is sufficiently heated and securely connected to the refrigerant pipe.

  After the piping 10 and the refrigerant piping are connected, the control box 4 is screwed to the intermediate metal plate 16 from the inside of the indoor unit 100 with the screw 17a and fixed to the indoor unit 100. Connect the external power supply line to Then, the closing plates 12a and 12b are screwed to cover the openings 13a and 13b. Finally, the exterior panel is screwed to the front of the indoor unit 100, and the installation work of the indoor unit 100 is completed.

  As described above, the indoor unit 100 opens the openings 13a and 13b of the fan casing 9 even if the work space adjacent to the fan casing 9 is not provided, and the space inside the fan casing 9 is required for welding. It can be secured as space. Furthermore, since the control box 4 can be removed, visual recognition of the pipe 10 is further facilitated, and it is also easy to handle a welding device such as the gas welding torch 14 or the like.

  When maintenance is performed during use, the exterior panel on the front of the indoor unit 100 may be removed, and the control box 4 and the closing plates 12a and 12b of the fan casing 9 may be removed as necessary. This makes it possible to use the internal space of the fan casing 9 as a work space and to facilitate visual recognition of the pipe 10 disposed after the control box 4.

Modified Example FIG. 6 is a modified example of the fan casing according to the present embodiment. As shown in FIG. 6, an opening 13c may be formed at a corner of the fan casing 9, and a box-shaped fan casing 9 may be formed by closing the opening 13c with a closing plate 12c closing the opening 13c. Also in this case, the space inside the fan casing 9 can be used as a work space by removing the closing plate 12c and opening the opening 13c. In this manner, the position and shape of the opening may be determined according to the position where the pipe 10 and the control box 4 are disposed, and the closing plate may be provided in accordance with the position and shape of the opening.

  Although the size of the opening formed in the fan casing 9 is not particularly limited, it should be large enough to handle the welding apparatus, and can be moved without difficulty within the range in which the welding apparatus moves. It is desirable to select as appropriate.

  According to the indoor unit 100 according to the present invention described above, the closing plates 12a and 12b of the fan casing 9 are removed, and the openings 13a and 13b are opened to use the inside of the fan casing 9 as a work space for installation work It can be performed. As a result, the arrangement area of the indoor unit 100 can be reduced without changing the size of the fan casing 9, and the indoor unit 100 can be installed with a small occupied area while maintaining the blowing efficiency of the fan 19. Is obtained.

  Since the pipe 10 for supplying the refrigerant is disposed between the inner side surface of the indoor unit 100 and the side surface of the fan casing 9 provided with the opening 13a, the opening 13a is opened to open the opening 13a. It is easy to view the piping 10.

  Even when using a turbo fan whose blowing efficiency is easily affected by the size of the fan casing 9 as the fan 19, the occupied area of the indoor unit 100 can be reduced while maintaining the size of the fan casing 9.

  Since the openings 13a and 13b are provided on two adjacent side surfaces of the fan casing 9, the pipe 10 can be visually recognized through the openings 13a and 13b.

  The closing plates 12a and 12b of the fan casing 9 removed when performing the installation work can be disposed on the inner side surface of the indoor unit 100 and can function as a curing member that prevents the spreading of the heat insulating material of the exterior panel at the time of welding.

  The control box 4 is screwed to the middle sheet metal 16, and the middle sheet metal 16 disposed on the inner side surface of the indoor unit 100 main body is screwed from the outer side surface of the main body, whereby the control box 4 is fixed to the main body The control box 4 can be removed by releasing the screws.

  Reference Signs List 1 suction port, 2 outlet, 3 main control box, 4 control box, 4a mounting plate, 5 evaporator, 6 main drain pan, 7 sub drain pan, 8 drain hose, 9 fan casing, 9a housing, 10 piping, 11 air Inlet, 12a, 12b, 12c plate, 13a, 13b, 13c opening, 14 gas welding torch, 15 frame, 15a square plate, 16 intermediate sheet metal, 17a, 17b screw, 19 fan, 100 indoor unit.

Claims (4)

A main body provided with a suction port on the upper surface and a blowout port on the lower surface,
A fan housed in the main body and forming an air path from the suction port to the air outlet;
A fan casing for housing the fan;
A heat exchanger provided in the air passage;
Piping provided between the fan casing and the inner side surface of the main body and connected to the heat exchanger;
Equipped with
The fan casing is
It is a box-shaped case formed of a plurality of plates ,
An air inlet formed on the top surface,
An air outlet formed on the lower surface,
Among the plurality of plates, an opening was made form a portion of a plate forming the adjacent side,
Covering the opening, and a removable closing plate,
Equipped with
The piping is
It is disposed at a position where it can be seen through the opening when the blocking plate is removed.
Indoor unit. The fan is
Be a turbo fan,
The indoor unit according to claim 1. On the inner side of the body,
A temporary storage space is provided for temporarily placing the closing plate,
The indoor unit according to claim 1 or 2. It has a control box screwed to the middle sheet metal,
The intermediate sheet metal is screwed from the outer surface of the main body to the inner surface of the main body, and the control box is fixed to the inner surface of the main body;
The indoor unit as described in any one of Claims 1-3.

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