JP2020020559A - Indoor unit of air conditioner - Google Patents

Abstract

To provide an indoor unit of an air conditioner which enables improvement of performance and maintainability.SOLUTION: An indoor unit 1 of an air conditioner includes: a housing 5 which is hung spaced apart from an indoor ceiling 4; an air inlet port 6 which opens on a side surface of the housing 5 and suctions indoor air from a surrounding area; an air outlet port 7 which opens at a center part of a lower surface of the housing 5 and blows air downward into an indoor space; a propeller fan 9 which is provided at a position corresponding to the air outlet port 7 and in which a rotary shaft 16 extends in a vertical direction; a fan motor 10 which is connected to the rotary shaft 16 and rotates the propeller fan 9 to blow air suctioned from the air inlet port 6 from the air outlet port 7; and an electric box 21 which houses electronic components and is disposed on an upper surface of the housing 5.SELECTED DRAWING: Figure 3

Description

  An embodiment of the present invention relates to an indoor unit of an air conditioner.

  2. Description of the Related Art Conventionally, in an indoor unit of an air conditioner installed on a ceiling, there is an indoor unit in which air is suctioned from a suction port on a side surface of a housing and blown out from an outlet on a lower surface of the housing. In such an indoor unit, an electric box is provided on a side surface of the housing, and a fan motor is controlled by electronic components stored in the electric box.

Japanese Patent No. 4766169

  In the above-mentioned indoor unit, the air behind the ceiling is sucked in from the side of the housing, and the conditioned air is blown out into the room from the lower surface of the housing. And the ability is reduced accordingly. In addition, since the housing of the indoor unit is arranged behind the ceiling, there is a problem that the maintainability including the electrical box is poor. Further, since the air behind the ceiling is sucked, there is a problem that the stirring performance of the indoor air is low. Further, when a high-efficiency inverter-driven motor is used as a fan motor for driving the indoor fan, a weak electromagnetic wave that becomes noise may be generated from a wiring extending from the electrical box to the fan motor. In this indoor unit, since the fan motor is arranged in the center of the inside of the housing, the wiring extending from the electrical box on the side surface of the housing to the fan motor becomes long, and faint electromagnetic waves serving as noise are easily radiated to the surroundings. Become.

  An embodiment of the present invention has been made in consideration of such circumstances, and has an object to provide an indoor unit of an air conditioner that can improve performance and maintainability.

  The indoor unit of the air conditioner according to the embodiment of the present invention, a housing that is suspended from the ceiling of the room at an interval, a suction opening that is opened on a side surface of the housing and sucks room air from the surroundings, An outlet that is opened at the center of the lower surface of the housing and that blows air downward toward the room, a heat exchanger provided inside the housing so as to face the suction opening, and the heat exchanger A propeller fan that is surrounded and provided at a position corresponding to the outlet, and has a rotating shaft that extends in a vertical direction, and that is connected to the rotating shaft, rotates the propeller fan to rotate air sucked from the suction port. A fan motor that blows out from an outlet and an electrical box that houses electronic components and is disposed on the upper surface of the housing are provided.

The figure which shows the inside of the building in which the indoor unit of 1st Embodiment was provided. FIG. 2 is a cross-sectional bottom view showing the indoor unit of the first embodiment. FIG. 2 is a vertical sectional side view showing the indoor unit of the first embodiment. FIG. 2 is a top view illustrating the indoor unit according to the first embodiment. FIG. 2 is a circuit diagram showing a circuit configuration of the indoor unit according to the first embodiment. The longitudinal section side view showing the indoor unit of a 2nd embodiment. The longitudinal section side view showing the indoor unit of a 3rd embodiment.

(1st Embodiment)
First, an indoor unit of the air conditioner according to the first embodiment will be described with reference to FIGS. 1 is an indoor unit of an air conditioner. The air conditioner includes an outdoor unit (not shown) installed outdoors and an indoor unit 1 installed indoors. The outdoor unit and the indoor unit 1 are connected via a refrigerant pipe P for circulating a refrigerant. Then, a refrigeration cycle is configured by circulating a refrigerant between the outdoor unit and the indoor unit 1.

  As shown in FIG. 1, an indoor unit 1 of an air conditioner according to the present embodiment is used for conditioning air in an indoor space inside a building. This indoor space is a closed space surrounded by the floor 2, the wall 3, and the ceiling 4. The indoor unit 1 of the present embodiment is suspended from the ceiling 4 at a predetermined interval, for example, 1 m. For this reason, the indoor unit 1 is a so-called ceiling-suspended indoor unit. Similarly, a plurality of lighting fixtures E are suspended from the ceiling 4.

  As shown in FIGS. 2 and 3, the indoor unit 1 includes a housing 5 having a substantially circular shape when viewed from the bottom, a suction port 6 opened on the outer peripheral surface of the housing 5, and for sucking room air K from the surroundings. An outlet 7 which is opened at the center of the lower surface of the housing 5 and blows the air K downward, and which is provided inside the housing 5 and is provided opposite to the suction port 6 to form an annular shape in a bottom view. A heat exchanger 8, a propeller fan 9 provided at a position corresponding to the air outlet 7, a fan motor 10 for rotating the propeller fan 9, and a fan motor 10 provided below the heat exchanger 8 and generated on the surface of the heat exchanger 8. A drain pan 11 for receiving dew condensation water.

  The housing 5 includes a circular lid-shaped upper member 12 (upper portion of the housing) provided on the upper surface, a ring-shaped lower member 13 (lower portion of the housing) provided on the lower surface, and upper and lower portions provided on the side surface. It is formed by a plurality of side members 14 (side portions of the housing) having a plate shape extending in the direction. In the case 5, the upper member 12 and the lower member 13 are fixed to each other via the side member 14. With these members, the housing 5 is integrally formed in a substantially cylindrical shape. As shown in FIG. 2, in the present embodiment, the number of the side members 14 is four, and the space between the side members 14 forms the suction port 6. For this reason, there are four suction ports 6 on the side surface. The upper member 12, the lower member 13, and the side members 14 are formed by sheet metal or the like.

  Also, four metal rod-shaped hanging portions 15 extending in the floor direction are fixed to the ceiling 4. The upper member 12 of the housing 5 is fixed to the lower ends of the hanging portions 15. The housing 5 is hung from the ceiling 4 by the hanging portions 15. That is, the housing 5 is provided at a position lower than the ceiling 4.

  With this configuration, the air K in the indoor space to be air-conditioned can be taken in from the side surface and blown out from the outlet 7 on the lower surface of the housing 5, so that the air in the indoor space can be efficiently circulated. . That is, the air K flowing near the ceiling 4 can flow downward from the indoor unit 1. Furthermore, the air K that has reached the floor 2 from the indoor unit 1 flows along the wall 3 and reaches the ceiling 4 again. Note that the indoor unit 1 is preferably provided in the center of a room to be air-conditioned. Thus, the entire room can be uniformly air-conditioned.

  In the present embodiment, the upper member 12 of the housing 5 is fixed while being separated from the ceiling 4. The case 5 has a circular shape when viewed from the bottom, but may have another shape. For example, the housing 5 may have a polygonal shape of a pentagon or more in bottom view. That is, the housing 5 may have a hexagonal, octagonal, or decagonal shape when viewed from the bottom. When the casing 5 is polygonal, it is desirable that each side has substantially the same length.

  The indoor unit 1 is arranged with the housing 5 exposed from the ceiling 4. Thus, the casing 5 of the indoor unit 1 has a circular shape when viewed from the bottom, so that the design can be improved. Furthermore, since there are no corners in the housing 5, it is possible to prevent a person below the indoor unit 1 from feeling a feeling of oppression.

  The heat exchanger 8 housed in the indoor unit 1 has a ring-shaped ring shape when viewed from the bottom (see FIG. 2), and has a vertically long rectangular shape when viewed from the vertical section (see FIG. 3). The outlet 7 provided at the center of the ring-shaped lower member 13 has a circular shape when viewed from the bottom. In the bottom view, the center of the heat exchanger 8, the center of the propeller fan 9, and the center of the outlet 7 coincide. Note that the diameter of the outlet 7 is slightly larger than the diameter of the propeller fan 9.

  The propeller fan 9 is provided at a position surrounded by the annular heat exchanger 8, that is, at a central position of the housing 5 when viewed from the bottom. Further, the rotation shaft 16 of the propeller fan 9 extends in the vertical direction, that is, in the upward direction. The upper end of the rotating shaft 16 is connected to the fan motor 10. The fan motor 10 is fixed to a central lower surface of the upper member 12 of the housing 5 via a mounting bracket 17. When the propeller fan 9 is rotated by the driving force of the fan motor 10, the air K sucked from the suction port 6 provided between the side members 14 forming the side surfaces passes through the heat exchanger 8 and is blown out. Blow down from 7.

  The suction ports 6 are provided at a plurality of locations over the entire outer peripheral surface of the housing 5. The heat exchanger 8 is provided at a position corresponding to the suction port 6 while being close to the inner peripheral surface of the housing 5. Note that the heat exchanger 8 is fixed to the lower surface of the upper member 12 of the housing 5 using a fixing portion 18.

  During the cooling operation, the refrigerant is discharged as a high-temperature and high-pressure gas from the compressor of the outdoor unit and flows to the outdoor heat exchanger. This refrigerant exchanges heat with outdoor air in an outdoor heat exchanger, is condensed, and flows into a refrigerant pipe P (see FIG. 1). Then, in the indoor unit 1, the liquid refrigerant becomes a low-temperature gas refrigerant from the refrigerant pipe P via an electric expansion valve which is an expansion device, and flows into the indoor heat exchanger 8. The low-temperature refrigerant is heat-exchanged with the air in the room to be air-conditioned in the indoor side heat exchanger 8 to evaporate and gasify. At this time, the room is cooled by the low-temperature air blown from the indoor unit 1. The expansion device may be provided on the outdoor unit side.

  During the heating operation, the refrigerant is discharged as a high-temperature and high-pressure gas from the compressor of the outdoor unit, and flows into the refrigerant pipe P. Then, in the indoor unit 1, the high-temperature gaseous refrigerant flows into the indoor-side heat exchanger 8. The gaseous refrigerant is condensed and liquefied by exchanging heat with the air in the room to be air-conditioned in the indoor heat exchanger 8. At this time, the room is heated by the high-temperature air blown from the indoor unit 1.

  A drain pan 11 serving as a drain receiving portion is provided immediately below the heat exchanger 8. During the cooling operation in which the heat exchanger 8 functions as an evaporator, moisture contained in the air K passing through the heat exchanger 8 is condensed on the surface of the heat exchanger 8 and adheres to the heat exchanger 8 as condensed water and drips. drop down. A drain pan 11 is provided to receive the dew water falling from the heat exchanger 8.

  The drain pan 11 is a member that has a substantially U-shape when viewed from the vertical side and is provided so as to surround the propeller fan 9. This drain pan 11 is arranged at a position below the heat exchanger 8. The condensed water stored in the drain pan 11 is pumped up by a drain pump (not shown) built in the housing 5 and is provided with a predetermined drain pipe (not shown, generally attached at the same position as the refrigerant pipe P). Is drained to the outside of the indoor unit 1 via. In the present embodiment, the drain pan 11 and the lower member 13 are separate bodies, but the drain pan 11 and the lower member 13 may be integrated.

  As shown in FIG. 3, a louver 19 for adjusting the direction of the air K blown out from the outlet 7 is provided in the outlet 7 on the lower surface side of the housing 5. The louver 19 is formed by arranging a plurality of elongated blades with a gap. In the present embodiment, the blades having an arc shape in bottom view are provided in a circular shape along the circular outlet 7 (see FIG. 1). A louver motor 20 for changing the direction of the louver 19 is provided at the edge of the outlet 7.

  On the upper surface of the upper member 12 of the housing 5, an electrical box 21 for storing electronic components for controlling mounted devices such as the fan motor 10 and the louver motor 20 is provided above the lower end of the fan motor 10. . That is, the electrical box 21 is disposed in the gap between the upper surface of the upper member 12 of the housing 5 and the surface of the ceiling 4. A fan motor wiring 22 extending from the electrical box 21 is connected to the fan motor 10. The louver motor wiring 23 extending from the electrical box 21 is connected to the louver motor 20. The electrical box 21 is a square metal box for protecting the electric and electronic components housed therein from external dust or moisture.

  A plurality of circular insertion holes 27 are formed on the upper surface of the upper member 12. Each of these insertion holes 27 is hermetically sealed with a bushing 47 made of elastic rubber or the like so that there is no gap even when the wirings 22 and 23 pass or not. If there is a gap in this portion, the amount of heat exchange is reduced accordingly, and at the time of cooling operation, the propeller fan 9 comes into contact with the air on the ceiling 4 side, which has not passed heat exchange, passing through the gap. Dew condensation may occur on the surface of the propeller fan 9 and may drop. A bushing 47 is provided to prevent this.

  As shown in FIG. 4, on the upper surface of the upper member 12 of the housing 5, box mounting portions 24 to which a rectangular electrical box 21 can be mounted are provided at four places. A screw hole 26 into which a screw 25 as a mounting jig for the electrical box 21 is screwed is formed corresponding to each of the box mounting portions 24. The screw 25 is inserted into a hole provided on a protruding piece that protrudes from the edge of the electrical component box 21. In addition, the above-described insertion holes 27 are provided at four places of the upper member 12 corresponding to the respective box mounting portions 24. The insertion hole 27 is provided at a position slightly away from the position where the corresponding box mounting portion 24 is provided toward the center of the upper member 12.

  The box mounting portion 24 is provided along the edge of the upper member 12 of the housing 5. These box mounting portions 24 are provided at different positions on the upper surface of the upper member 12. That is, the box mounting portion 24 is provided at a position where an operator performing maintenance or the like of the indoor unit 1 can access the upper member 12 of the housing 5 from any one of four front, rear, left, and right directions.

  When the indoor unit 1 is installed on the ceiling 4, the user can select an arbitrary box mounting portion 24 that is easy for the operator to maintain and mount the electrical box 21. Thus, the electrical component box 21 can be provided at a position where maintenance can be performed while avoiding the refrigerant pipe P and the lighting fixture E. Further, the electrical box 21 can be provided at a position where maintenance is easy while avoiding obstacles such as the wall 3 or furniture near the side of the installation location.

  As described above, since the entire indoor unit 1 is hung from the ceiling 4, the housing 5 and the electrical box 21 are exposed indoors, and maintenance can be performed with good access. Further, since the electrical box 21 is mounted on the upper surface of the housing 5, the electrical box 21 does not affect the suction port 6 on the side surface, and the area of the suction port 6 can be increased. For this reason, it becomes possible to increase the amount of intake air of the indoor unit 1, and it is possible to increase the performance of the indoor unit 1 and improve the performance.

  In the present embodiment, the box mounting portions 24 are provided at four locations on the upper surface of the housing 5, but may be provided at least at two or more locations on the upper surface of the housing 5. In addition, it is possible to make the electrical box 21 invisible to a user in the room, thereby improving the appearance. Assuming the interior space of a general size and the dimensions of the indoor unit 1, the height of the electrical box 21 is generally about 5 cm. The electrical component box 21 may be attached at a position 7 cm or more from the end (outer periphery) of the member 12 and closer to the center of the housing. For this purpose, the corner of the box mounting portion 24, that is, the position of the screw hole 26 is provided at a position close to the center of the housing 5 at a predetermined interval from the end of the upper member 12. For example, the separation dimension D from the lower end (lower corner) of the side surface of the electrical component box 21 to the end of the upper member 12 may be 7 cm or more.

  As shown in FIG. 4, the oblong hole opened in the upper member 12 is a refrigerant pipe insertion hole Pa. A round hole provided near the hole is a drain drain pipe insertion hole Pb. The refrigerant pipe P extends from the inside of the housing 5 along the ceiling 4 through the refrigerant pipe insertion hole Pa, penetrates the wall 3 of the room, and is connected to the outdoor unit. Similarly, the drain pipe extends from the drain pan 11 in the housing 5 through the drain drain pipe insertion hole Pb via a drain pump to a position where the drain can be drained, such as outdoors. At the time of installation, the gap between the coolant pipe insertion hole Pa and the coolant pipe P, and the drain drain pipe insertion hole Pb and the gap between the drain pipe are filled with putty or the like and airtightly treated.

  In addition, a box mounting portion 24 to which the electrical box 21 is mounted is provided on the upper surface of the upper member 12 on the upper surface of the housing 5, and a through hole provided near the center of the upper member 12 corresponding to the box mounting portion 24. The fan motor wiring 22 extending from the electrical box 21 is passed through the hole 27. By doing so, the electrical box 21 can be brought close to the fan motor 10 located immediately below the center of the upper member 12, so that the fan motor wiring 22 can be shortened to reduce the emission of weak electromagnetic waves that become noise. it can.

  In this embodiment, the fan motor wiring 22 is shortened as much as possible by providing the insertion holes 27 at four locations corresponding to the four box attachment portions 24 of the upper member 12. However, only one insertion hole 27 is provided on the center side of the upper member 12 with respect to the box attachment portion 24, and the same insertion hole 27 is used regardless of which of the four box attachment portions 24 the electric box 21 is attached to. It is also possible. In this case, the fan motor wiring 22 becomes slightly longer, but its extension length is small, and noise does not increase so much. Further, when a plurality of insertion holes 27 are provided, it is necessary to close unused insertion holes 27 to prevent outside air from entering the housing. The trouble of closing the used insertion hole 27 can be saved.

  Note that the louver motor wiring 23 exits from the electrical box 21 together with the fan motor wiring 22 and passes through the insertion hole 27, and then passes through the inner surface of the housing 5 to the lower louver motor 20 as shown in FIG. Connected. For this reason, the louver motor wiring 23 has a considerably longer wiring length than the fan motor wiring 22. However, since the louver motor 20 operates at a low voltage of about 5 V to 12 V DC, the louver motor wiring 23 is a source of noise. Will not be.

  As shown in FIG. 5, an electronic component including a rectifier 28, a DC / DC converter 29, an inverter 30, and an indoor control unit 31 is housed in the electrical component box 21.

  The indoor control unit 31 of the indoor unit 1 controls mounted devices such as the fan motor 10 and the louver motor 20. The indoor controller 31 is connected to a temperature sensor 32, a remote controller 33 (remote operation device), and an outdoor controller 34 housed in an outdoor unit (not shown).

  In this embodiment, the temperature sensor 32 and the remote controller 33 are provided at predetermined positions on the wall 3 of the room where the indoor unit 1 is installed. A detection signal 35 indicating the temperature detected by the temperature sensor 32 is input to the indoor control unit 31. Further, an operation signal 36 of the remote controller 33 is input to the indoor control unit 31. Further, the indoor control unit 31 outputs a control signal 37 to the outdoor control unit 34. The remote controller 33 is a so-called wired type. The remote controller 33 is connected to the indoor controller 31 and the remote controller 33 and the indoor controller 31 and the outdoor controller 34 are connected by a communication line, and exchanges signals with each other via the communication line. .

  Further, each communication line is drawn out from the electrical box 21 together and reaches the room wall 3 along the refrigerant pipe P, where the communication line to the remote controller 33 is separated from the refrigerant pipe P and connected to the remote controller 33. . On the other hand, the communication line between the indoor control unit 31 and the outdoor control unit 34 penetrates the wall 3 of the room along the refrigerant pipe P to reach an outdoor unit installed outdoors. Connected.

  The rectifier 28 is connected to an external AC power supply 39 via a power supply wiring 38. Then, the rectifier 28 converts AC supplied from the AC power supply 39 into DC. The rectifier 28 is connected to a power supply wiring 38 via a noise filter 40.

  DC is supplied from the rectifier 28 to the DC / DC converter 29. The DC / DC converter 29 reduces the DC voltage supplied from the rectifier 28 to a DC voltage of 5 V to 12 V and supplies the DC voltage to the indoor control unit 31 and the louver motor 20. Further, the indoor control unit 31 outputs a control signal 41 for controlling the direction of the louver 19 to the louver motor 20 according to an instruction from the remote controller 33. The control signal 41 and the current supplied from the DC / DC converter 29 are transmitted to the louver motor 20 via the louver motor wiring 23 described above.

  DC is supplied from the rectifier 28 to the inverter 30. The AC power supply 39 is a 200V power supply, and the voltage after full-wave rectification by the rectifier 28 is about 280V DC. The inverter 30 is composed of semiconductor elements. The semiconductor elements are turned on / off at a switching frequency of about 20 kHz to convert the DC supplied from the rectifier 28 into a three-phase AC and supply the three-phase AC to the fan motor 10. . A high-efficiency DC brushless motor is used for the fan motor 10. The indoor control unit 31 outputs a control signal 42 for controlling the rotation speed of the propeller fan 9 to the inverter 30. The inverter 30 controls the frequency of the current supplied to the fan motor 10 based on the control signal 42. The current supplied from the inverter 30 is transmitted to the fan motor 10 via the fan motor wiring 22.

  The inverter 30 is a circuit that generates a pulsed AC by switching a high-voltage DC voltage at a high frequency in order to drive the fan motor 10, and thus becomes a noise generation source. Electromagnetic waves serving as noise are easily radiated from the fan motor wiring 22 directly connected to the inverter 30 to the surroundings.

  In the first embodiment, since the electrical box 21 is provided on the upper surface of the housing 5, the inverter 30, which is a source of noise, can be brought close to the fan motor 10. Radiation of noise to the periphery can be reduced.

  The wiring length L1 of the fan motor wiring 22 is shorter than the wiring length L2 of the louver motor wiring 23. In this case, since the wiring extending from the electrical box 21 to the fan motor 10 is short, a weak electromagnetic wave as noise is hardly radiated to the surroundings.

  Note that the electrical box 21 may be a portion other than the lower member 13 and the side member 14 of the housing 5 and may be arranged at least above the lower end of the fan motor 10.

  Although the power supply wiring 38 connected to the AC power supply 39 is connected to the electrical component box 21, the noise is not radiated from the power supply wiring 38 to the surroundings because the noise filter 40 is provided.

(2nd Embodiment)
Next, an indoor unit 1A of an air conditioner according to a second embodiment will be described with reference to FIG. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  As shown in FIG. 6, the indoor unit 1A of the second embodiment includes a motor arrangement portion 43 which swells downward from the center of the upper member 12 of the housing 5 and has the fan motor 10 arranged above. A support plate 44 is provided to cover the motor arrangement portion 43 from above and to swell upward from the center of the upper member 12 of the housing 5. Thereby, the height and the thickness of the side surface of the housing 5 are reduced to improve the appearance.

  The motor arrangement portion 43 has a mortar shape that narrows downward. A guide surface 43a that guides the air K that has passed through the heat exchanger 8 in the horizontal direction downward is formed on the outer peripheral surface on the lower surface side of the motor placement portion 43. The guide surface 43a is a surface that is inclined in a side view. The air K can be smoothly guided downward along the guide surface 43a. By doing so, the air blowing characteristics can be improved. The fan motor 10 is fixed to the lower surface of the support plate 44 with a member such as a screw (not shown). As a result, the fan motor 10 is housed in a space surrounded by the motor arrangement portion 43 and the support plate 44. A hole through which the rotating shaft 16 penetrates is provided at the center of the motor disposition portion 43, and the propeller fan 9 is attached to a tip of the rotating shaft 16 that penetrates this hole.

  An electrical box 21 is attached to an edge (a part other than the center) of the upper surface of the upper member 12 of the housing 5. Thus, the electrical box 21 is disposed above the lower end of the fan motor 10. Although not particularly shown, as in the first embodiment described above, four box mounting portions to which the electrical box 21 can be attached are provided, and the position of the electrical box 21 can be selected by an operator.

  In the second embodiment, since the fan motor 10 is arranged above the motor arrangement section 43, the fan motor 10 and the electrical box 21 can be brought close to each other to shorten the fan motor wiring 22.

(Third embodiment)
Next, an indoor unit 1B of an air conditioner according to a third embodiment will be described with reference to FIG. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  As shown in FIG. 7, the indoor unit 1 </ b> B of the third embodiment includes a motor mounting portion 46 which swells downward from the center of the upper member 12 of the housing 5 and has a lower surface to which the fan motor 10 is mounted. A mounting recess 46 a is formed on the upper surface of the portion 46 in a concave shape, and the electrical component box 21 is mounted therein.

  The motor mounting portion 46 has a mortar shape that narrows downward. A horizontal portion 46b is provided at the lower end of the center of the motor mounting portion 46, and the fan motor 10 is fixed to the lower surface of the horizontal portion 46b. By doing so, the structural strength for supporting the fan motor 10 can be improved.

  The electric component box 21 is attached to a mounting concave portion 46a that is an upper surface of a motor mounting portion 46 provided at the center of the upper surface of the housing 5 so as to be located above the lower end of the fan motor 10. The mounting recess 46a is formed with a screw hole into which a screw as a mounting jig for the electrical box 21 is screwed. That is, the mounting concave portion 46a is the box mounting portion of the third embodiment. As a result, the fan motor 10 is mounted on the lower surface of the central horizontal portion 46b with the motor mounting portion 46 therebetween, and the electrical component box 21 is mounted on the upper surface of the horizontal portion 46b.

  In the third embodiment, since the electrical box 21 is attached to the attachment concave portion 46a, the length of the electrical box 21 projecting upward can be suppressed, and the vertical dimension of the indoor unit 1B can be reduced. However, since the electrical component box 21 is located at the center of the upper part of the housing 5, the maintainability is slightly deteriorated as compared with the other embodiments.

  Although not particularly shown, the electrical box 21 can be attached to four locations on the upper surface of the upper member 12 of the housing 5 (portions other than the central portion) in the same manner as in the first embodiment. A box mounting portion may be provided, and the operator may select the position of the electrical box 21 from five locations.

  Although the indoor unit of the air conditioner according to this embodiment has been described based on the first to third embodiments, the configuration applied in any one of the embodiments may be applied to other embodiments. However, the configurations applied in each embodiment may be combined.

  In the present embodiment, the heat exchanger 8 has a ring shape in a bottom view, but may have another shape. For example, the heat exchanger 8 may be polygonal in bottom view. For example, the heat exchanger 8 may have a rectangular shape so as to surround the propeller fan 9. Further, the heat exchanger 8 divided into several parts may be connected by piping to form an annular shape. For example, the heat exchangers 8 divided for each suction port 6 may be provided, and the adjacent heat exchangers 8 may be connected by piping so as to be in series.

  In this embodiment, since the electrical box 21 is mounted on the upper surface of the housing 5, the maintainability is good, and the area of the suction port 6 is large, so that the amount of air sucked into the indoor unit 1 is increased, and Capability can be increased and performance can be improved. Further, it is possible to reduce the emission of a weak electromagnetic wave that becomes noise.

  According to each of the embodiments described above, by providing the electrical box arranged on the upper surface of the housing, it is possible to improve performance and maintainability.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, changes, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and equivalents thereof.

  1 (1A, 1B) ... indoor unit, 2 ... floor, 3 ... wall, 4 ... ceiling, 5 ... housing, 6 ... suction port, 7 ... outlet, 8 ... heat exchanger, 9 ... propeller fan, 10 ... Fan motor, 11 ... drain pan, 12 ... upper member, 13 ... lower member, 14 ... side member, 15 ... suspension part, 16 ... rotating shaft, 17 ... mounting bracket, 18 ... fixed part, 19 ... louver, 20 ... louver motor, DESCRIPTION OF SYMBOLS 21 ... electric box, 22 ... fan motor wiring, 23 ... louver motor wiring, 24 ... box mounting part, 27 ... insertion hole, 30 ... inverter, 31 ... indoor control part, 33 ... remote control, 34 ... outdoor control part, 43 ... Motor arrangement part, 43a ... Guide surface, 44 ... Support plate, 46 ... Motor mounting part, 46a ... Mounting concave part, 46b ... Horizontal part, 47 ... Bushing, D ... Separation dimension, E ... Lighting equipment, K ... Air, P ... refrigerant pipe, Pa ... insertion hole for refrigerant pipe, Pb Drain drainage pipe insertion hole.

Claims (10)

A housing that is suspended from the indoor ceiling at an interval,
A suction opening that is opened on the side surface of the housing and sucks room air from the surroundings,
An outlet that is opened at the center of the lower surface of the housing and blows air downward toward the room,
A heat exchanger provided inside the housing so as to face the suction port,
A propeller fan surrounded by the heat exchanger and provided at a position corresponding to the air outlet, and a rotating shaft extending in a vertical direction;
A fan motor connected to the rotating shaft and rotating the propeller fan to blow out the air sucked in from the suction port from the blowout port;
An electrical box that houses electronic components and is arranged on the upper surface of the housing,
An indoor unit of an air conditioner comprising:   The indoor unit of the air conditioner according to claim 1, wherein the electronic component includes an inverter that converts a direct current into an alternating current and supplies the alternating current to the fan motor, and includes a fan motor wiring that connects the inverter and the fan motor.   The indoor unit of the air conditioner according to claim 1 or 2, wherein the housing has a circular shape or a polygonal shape having a pentagon or more in bottom view. Fan motor wiring connecting the fan motor and the electrical box,
A louver for adjusting the direction of air blown from the outlet,
A louver motor for changing the direction of the louver,
Louver motor wiring connecting the louver motor and the electrical box,
With
The indoor unit for an air conditioner according to any one of claims 1 to 3, wherein the fan motor wiring is shorter than the louver motor wiring.   The indoor unit of an air conditioner according to any one of claims 1 to 4, further comprising a box mounting portion provided on an upper surface of the housing and to which the electrical box is mounted. A motor arranging portion which is swelled downward from a central portion of an upper portion of the housing and in which the fan motor is arranged upward,
A box mounting portion provided on an edge of the upper surface of the housing and to which the electrical box is mounted,
The indoor unit of the air conditioner according to any one of claims 1 to 5, further comprising:   The indoor unit of an air conditioner according to any one of claims 1 to 6, further comprising a box mounting portion provided at at least two places on an upper surface of the housing and to which the electrical box is mounted.   8. An insertion hole provided in an upper portion of the housing and provided at a center side of the housing with respect to the box mounting portion, through which a wiring for a fan motor connecting the fan motor and the electrical box is inserted. 9. The indoor unit of an air conditioner according to any one of the above.   The indoor unit for an air conditioner according to any one of claims 1 to 8, wherein the electrical component box is provided at a position closer to the center, the end of which is separated from the edge of the upper surface of the housing by at least 7 cm. A motor mounting portion that is swelled downward from a central portion of an upper portion of the housing, and the fan motor is mounted on a lower surface,
A mounting recess formed in the upper surface of the motor mounting portion in a concave shape, to which the electrical box is mounted;
The indoor unit of the air conditioner according to any one of claims 1 to 5, further comprising:

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