JP2009115360A - Recessed ceiling air conditioner - Google Patents

Abstract

In the grounding of an electrical component box, the wiring work is not required and the work is reduced, and the ceiling-embedded air that allows the electrical component box to be easily attached and detached during assembly of the main body or maintenance. Provide a harmony machine.
A case of an electrical component box 13 mounted on an electrical component box mounting portion 9b of a bell mouth 9 includes an earth plate 14 composed of an upper piece 14a, a central piece 14b and a lower piece 14c, and a dew receiving tray unit 10. The electrical component box 13 is connected to a suspension bolt embedded in the ceiling back wall through a fixture 15 secured to the lower surface of the housing and a mounting bracket 12 secured to the outer peripheral surface of the outer casing. Ensure a ground path.
[Selection] Figure 2

Description

  The present invention relates to a ceiling-embedded air conditioner, and more particularly to a grounding configuration in an electrical component box.

  A conventional ceiling-embedded air conditioner also has the same basic configuration as the ceiling-embedded air conditioner according to the present application, and will be described with reference to FIG. The ceiling-embedded air conditioner shown in FIG. 1 (A) is attached to the outer casing 1 suspended between the ceiling back wall surface 40 and the ceiling surface 41, and the outer casing 1, The decorative panel 2 includes a suction grill 4 that covers the ceiling surface 41 and is openable and closable at the center, and has an air outlet 5 formed in the periphery. A centrifugal fan 6 driven by a fan motor 7 and a heat exchanger 8 are disposed so as to surround the centrifugal fan 6 in the air flow path connecting the suction grill 4 and the outlet 5. The indoor air sucked from the suction grille 4 is sent to the heat exchanger 8 by the centrifugal fan 6, passes through this and is heat-exchanged, and then sent to the room again from the outlet 5. It has become.

  Between the suction grill 4 and the centrifugal fan 6, there is provided a bell mouth 9 formed in a ring shape that rectifies the sucked air and smoothly guides it to the centrifugal fan 6. 1, a dew receiving tray unit 10 including a dew receiving tray that receives condensed water dripping from the heat exchanger 8 is provided.

  FIG. 1B is a perspective view from below of the outer casing 1. As shown in FIG. 1B, a recess is formed on one side of the bell mouth 9, and an electrical component box 13 containing a power supply board and a control board is mounted in the recess. ing. From the electrical component box 13, power supply wiring and control signal wiring are derived, and ground wiring is applied for safety measures. However, after attaching the electrical component box 13 to the bell mouth 9, performing the ground wiring process is a work in the vicinity of the ceiling surface using a gantry or the like, so that the wiring work is difficult, At the time of maintenance, an operation for attaching and detaching the ground wiring is required, which imposes a burden on the operator.

As another embodiment, for example, the ceiling-embedded air conditioner 50 shown in FIG. 4 has a mounting portion 52a formed on one side of the bell mouth 52, and the electrical component is mounted on the mounting portion 52a. A box 53 is attached. A partition plate 55 extending vertically is attached to one side of a heat exchanger 54 provided in an outer casing (not shown), and an upper piece 55a extending upward is connected to the top plate 51 and is moved downward. The extended lower piece 55 b is connected to the electrical component box 53. Thereby, the earthing process of the electrical component box 13 is performed (refer patent document 1). However, the operation of connecting the partition plate 55 to the electrical component box 53 and the top plate 51 within the outer casing is a complicated operation at the time of assembly, and the operation of attaching / detaching the electrical component box 13 during maintenance. However, there is a possibility that the operator is burdened with the connection work with the partition plate 55.
JP-A-11-201496 (page 3, FIG. 3)

  In view of the above-mentioned problems, the present invention aims to reduce the work by eliminating the wiring work in the grounding of the electrical component box, and to easily attach and detach the electrical component box during assembly of the main body or during maintenance. An object of the present invention is to provide a ceiling-embedded air conditioner.

  In order to solve the above-mentioned problems, the present invention has an outer casing mounted on a suspension bolt that is hung between a ceiling bolt and a ceiling bolt that is embedded in a ceiling wall. A ceiling embedding comprising a heat exchanger and a blower fan, a dew tray unit for receiving condensed water dripping from the heat exchanger, a bell mouth having an air inflow hole, and an electrical component box In the air conditioner, a ground plate is provided on the lower surface of the dew tray unit, and the electrical component box is grounded by connecting the electrical component box and the mounting bracket secured to the suspension bolt by the ground plate. It becomes the composition which becomes. Further, the electrical component box is mounted in a recess formed on one side of the bell mouth, and one end of the ground plate is connected to the electrical component box. Further, a fixture made of sheet metal is provided on the lower surface of the dew tray unit, and the other end of the ground plate and the fixture are connected by the fixture.

  According to the present invention, the case of the electrical component box mounted on the bell mouth is connected to the ground plate, the fixture fixed to the lower surface of the dew tray unit, and the mounting bracket fixed to the outer peripheral surface of the outer casing. By connecting to the suspension bolts embedded in the ceiling back wall, the ground path of the electrical component box is secured, and the ground plate is attached when the ceiling-embedded air conditioner is assembled. When installing on the ceiling surface, ground wiring processing is not required, and work with danger in the vicinity of the ceiling surface can be reduced to improve safety. In addition, even during maintenance, when checking a control board or the like built in the electrical component box, it is not necessary to attach or detach the ground wiring from the electrical component box, and the burden on the operator in the maintenance operation can be reduced. It is like that.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

  FIG. 1A is a cross-sectional view of a ceiling-embedded air conditioner, and FIG. 1B is a perspective view of an outer casing. FIG. 2A is an exploded perspective view showing the mounting of the electrical component box, and FIG. 2B is a perspective view of the main part thereof. FIG. 3 is an explanatory diagram showing the grounding process.

  The ceiling-embedded air conditioner according to the present invention is provided with a plurality of suspension bolts 11 embedded in the ceiling back wall 40 on the side surface of the outer casing 1 as shown in the cross-sectional view of FIG. The mounting bracket 12 is screwed to be attached to the polygonal outer casing 1 suspended between the ceiling back wall 40 and the ceiling surface 41, and the lower surface of the outer casing 1, The decorative panel 2 covers the ceiling surface 41.

  Similar to the configuration described in the conventional example, a rectangular opening is provided in the central portion of the decorative panel 2, and a lattice-shaped suction port composed of a plurality of crosspieces is formed in the opening. A suction grill 3 in which a filter 4 made of a nonwoven fabric or the like is detachably mounted on the back surface of the mouth is provided so as to be openable and closable by being pivotally supported at one end edge. A plurality of air outlets 5 provided with wind direction plates 5 a are formed on the four side edges of the decorative panel 2. An air flow path, which is indicated by an arrow, connecting the suction grill 3 and the outlet 5 is arranged in parallel so as to surround the centrifugal fan 6 and a centrifugal fan 6 that is rotationally driven by a fan motor 7. A heat exchanger 8 including a large number of fins and heat transfer tubes disposed in a meandering manner so as to be orthogonal to the fins is disposed. The indoor air sucked in from the suction grill 3 is sent out toward the heat exchanger 8, passes through this, is heat-exchanged, and is sent out into the room again from the outlet 5.

  Between the suction grill 4 and the centrifugal fan 6, there is provided a bell mouth 9 formed in a ring shape that rectifies the sucked air and guides it to the centrifugal fan 6. A dew tray unit having a dew tray that receives condensed water dripping from the heat exchanger 8 and a drain pump that sucks the condensed water stored in the dew tray and sends it to a drain hose in the housing 1. 10 is provided.

  As shown in the perspective view from the lower side of FIG. 1B, the outer casing 1 suspended from the ceiling surface 41 and the ceiling back wall surface 40 has a substantially octagonal shape with corners being inclined. A mounting bracket 12 whose outer shape is formed in a U-shape is fixed to the plurality of corner slopes, and a pipe connected to the heat exchanger 8 is led out from one side of the corner. An electrical component box 13 is mounted on one side of the bell mouth 9.

  The dew tray unit 10 and the bell mouth 9 are configured as shown in the exploded perspective view of FIG. The dew tray unit 10 is made of a foamed polystyrene material having an insulating property, and is formed in a substantially octagonal shape with corners being inclined so as to be housed in the outer casing 1 from below. Around the dew receiving tray unit 10, a plurality of passage holes 10a through which air blown out from the centrifugal fan 6 and heat-exchanged by the heat exchanger 8 passes toward the outlet 5 of the decorative panel 2 are formed. In addition, a fixture 15 made of a sheet metal material is fixed to the lower surface of each corner portion. The dew tray unit 10 is fixed to the outer casing 1 by screwing the fixture 15 onto a mounting bracket 12 fixed to the outer peripheral surface of the outer casing 1.

  The bell mouth 9 is made of a resin material, and the central portion protrudes upward so as to have a cross-sectional curved shape facing each other, thereby forming a circular inflow hole 9a. The indoor air sucked from the suction grill 3 of the decorative panel 2 is rectified by a flow path formed in a cross-sectional curved shape facing the bell mouth 9 and sucked into the centrifugal fan 6 from the inflow hole 9a. It has become so. Further, a rectangular recess recessed upward is formed on one side of the bell mouth 9, and the recess serves as an electrical component box mounting portion 9 b to which the electrical component box 13 is mounted from below. The bell mouth 9 is integrated with the dew receiving tray unit 10.

  The electrical component box 13 is made of a metallic case having an upper cover 13a, and a power supply board, a control board, and the like on which electronic components are mounted are housed inside. Further, as shown in FIG. 2B, screw insertion holes 13b are formed in the upper cover 13a. The electrical component box 13 and the fixture 15 are connected by a ground plate 14 so that the electrical component box 13 is grounded.

  The ground plate 14 is made of a highly conductive sheet metal material, and as shown in FIG. 2B, a horizontal upper piece 14a and a central portion formed by bending one end of the upper piece 14a vertically. It consists of a piece 14b and a lower piece 14c which is bent horizontally at the lower end of the central piece 14b and extends horizontally. Screw insertion holes 14d and 14f are provided at the end of the upper piece 14a. Screw insertion holes 14e are respectively formed at the ends of the screw holes.

  Next, the mounting bracket 12 fixed to the outer peripheral surface of the outer casing 1 and the mounting tool 15 of the dew tray unit 10 will be described. As shown in FIG. 2 (B), the mounting bracket 12 is bent horizontally at the vertical center piece 12a and the upper end of the center piece 12a, and the suspension bolt 11 is inserted therethrough. An upper piece 12b having a notch and a lower piece 12c that is bent horizontally at the lower end of the central piece 12a and formed in a U-shaped cross section. A screw hole 12d is formed in the lower piece 12c. Is drilled. The fixture 15 fixed to the periphery of the lower surface of the dew receiving tray unit 10 has a screw insertion hole 15a corresponding to the screw hole 12d on the front end side and a screw hole 15b on the rear end side. Yes.

  Next, attachment of the electrical component box 13 and the ground plate 14 will be described. First, the dew tray unit 10 is housed and fixed in the outer casing 1. The screw tray 16 is inserted into the screw insertion holes 15 a of the plurality of fixtures 15 and is screwed into the screw holes 12 d formed in the lower piece 12 c of the mounting bracket 12, whereby the dew receiving tray unit 10 is connected to the outer casing. It is designed to be fixed in the body 1.

  Next, the upper piece 14a of the ground plate 14 is brought into contact with the upper surface of the electrical component box mounting portion 9b of the bell mouth 9, and the lower piece 14c is brought into contact with the lower surface of the dew receiving tray unit 10. Then, the screw 16 is inserted into the screw insertion hole 14e and screwed into the screw hole 15b of the fixture 15. Further, a countersunk screw 18 is inserted into the screw insertion hole 14f of the upper piece 14a, and is screwed into the screw hole of the bell mouth 9, thereby fixing the ground plate 14. By using a countersunk screw 18 in the screw insertion hole 14f, it is possible to prevent the screw head from protruding from the earth plate 14 and inadequate contact between the earth plate 14 and the upper cover 13a of the electrical component box 13. It has become.

  Subsequently, the screw 16 is inserted into the screw insertion hole 13b formed in the upper cover 13a of the electrical component box 13 and the screw insertion hole 14d formed in the upper piece 14a of the ground plate 14, and the bell The mouse 9 is screwed into a screw hole (not shown) formed in the mouse 9. Further, the electrical component box 13 is mounted on the electrical component box mounting portion 9b by a plurality of screw fastening points (not shown).

  A state in which the electrical component box 13 and the ground plate 14 are mounted on the dew tray unit 10 is shown in a cross-sectional view in FIG. 3A and a perspective view of a main part in FIG. The case of the electrical component box 13 is connected to the upper piece 14 a of the ground plate 14 by a screw 16, and the lower piece 14 c of the ground plate 14 is connected to the rear end portion of the fixture 15 by the screw 16. It has become. The tip of the fixture 15 is connected to the lower piece 12 c of the mounting bracket 12 by a screw 16, and the upper piece 12 b of the mounting bracket 12 is connected to the suspension bolt 11 via a nut 17. ing. Further, as described above, by using the countersunk screw 18 as a screw for fixing the ground plate 14 and the bell mouth 9, the ground plate 14 and the upper cover 13a of the electrical component box 13 can be sufficiently brought into contact with each other. ing. Thereby, as shown by the arrow, the ground path is secured in the order of the electrical component box 13 → the ground plate 14 → the mounting tool 15 → the mounting bracket 12 → the suspension bolt 11.

  The ground plate 14 is mounted on the ceiling surface of the ceiling-embedded air conditioner by being attached to the bell mouth 9 and the fixture 15 when the ceiling-embedded air conditioner is assembled. At this time, the ground wiring process from the electrical component box 13 is not required, so that the burden on the operator can be reduced, and the work accompanied by danger in the vicinity of the ceiling surface can be reduced and the safety can be improved. Further, even during maintenance, the work of attaching and detaching the ground wiring is not required, and the maintenance work can be reduced.

(A) is sectional drawing of a ceiling embedded type air conditioner.

(B) is a perspective view of an outer casing.
(A) is a disassembled perspective view which shows attachment of an electrical component box.

(B) is the principal part perspective view.
It is explanatory drawing which shows an earth process. It is a disassembled perspective view which shows the earthing process of the conventional ceiling-embedded air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer casing 2 Cosmetic panel 3 Suction grill 4 Filter 5 Outlet 5a Airflow direction plate 6 Centrifugal fan 7 Fan motor 8 Heat exchanger 9 Bell mouth 9a Inflow hole 9b Electrical component box mounting part 10 Dew tray unit 10a Passage hole 11 Hanging bolt 12 mounting bracket 12a central piece 12b upper piece 12c lower piece 12d screw hole 13 electrical component box 13a upper cover 13b screw insertion hole 14 ground plate 14a upper piece 14b central piece 14c lower piece 14d, 14e screw insertion hole 15 fitting 15a Screw insertion hole 15b Screw hole 16 Screw 17 Nut 18 Countersunk screw 40 Ceiling back wall surface 41 Ceiling surface

Claims (3)

A heat exchanger and a blower fan are installed in the outer casing that is hung between the ceiling back wall and the ceiling surface by hanging the mounting bracket on the outer peripheral surface on the suspension bolt embedded in the ceiling back wall. In the ceiling-embedded air conditioner comprising a dew tray unit that receives condensed water dripping from the heat exchanger, a bell mouth that forms an air inflow hole, and an electrical component box,
A ground plate is provided on the lower surface of the dew tray unit, and the electrical component box is connected to the mounting bracket secured to a suspension bolt by the ground plate, and the electrical component box is grounded. Features a ceiling-embedded air conditioner.   2. The ceiling embedding according to claim 1, wherein the electrical component box is mounted in a recess formed on one side of the bell mouth, and one end of the ground plate is connected to the electrical component box. Built-in air conditioner.   The fixture according to claim 1 or 2, wherein a fixture made of sheet metal is provided on a lower surface of the dew tray unit, and the other end of the ground plate and the fixture are connected by the fixture. The ceiling-embedded air conditioner described.

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