JP5197455B2 - Ceiling cassette type air conditioner - Google Patents

Description

  The present invention relates to an outer sheet metal structure of a ceiling cassette type air conditioner.

  A conventional ceiling cassette type air conditioner embedded in a ceiling room through a hole provided in the ceiling has an air conditioner body composed of a box-shaped outer sheet metal having an opening at the bottom, and the lower part of the air conditioner body It has a configuration in which a substantially rectangular decorative panel is attached to the opening. Air outlets are formed on a pair of sides facing the decorative panel, and an air passage communicating with the outlet is formed in the air conditioner body. And the air in an air conditioner main body passes the wind path of an air conditioner main body, and is ventilated indoors from a blower outlet. And the lower end of the air conditioner main body connected to the decorative panel in the air conditioner main body is bent inward to form a flange portion, and this flange portion prevents twisting and bending acting on the air conditioner main body. Strength is secured. The flange portion is provided with a screw hole for fixing a decorative panel for fixing the decorative panel, and the air conditioner body and the decorative panel are fixed by screwing (for example, see Patent Document 1).

Japanese Utility Model Publication No. 58-87018 (page 4, Fig. 1)

  In the conventional air conditioner, as described above, the flange portion is formed by bending the lower end connected to the decorative panel in the air conditioner body inward. Since the flange portion is located in the air passage, it is cooled by the cold air during cooling operation. Therefore, when the low temperature of the flange part is transmitted to the side surface of the air conditioner body by heat transfer, and the temperature of the side surface of the air conditioner body falls below the dew point of the ceiling air, the air conditioning that is in contact with the ceiling air There was a problem that the outer surface of the side of the machine body would be condensed.

  As a countermeasure against the condensation, a method of attaching a heat insulating material to the inner surface of the side surface of the air conditioner main body is effective. However, this method causes an increase in product cost and deterioration of workability due to an increase in product size. Moreover, when a heat insulating material is used, an air path is narrowed by that much and aerodynamic performance deteriorates. Therefore, it is preferable to use the heat insulating material as thin as possible.

  The present invention has been made to solve the above-described problems. By providing a flange portion in the air conditioner body, the strength against bending and bending is improved, and at the same time, the air can be produced at a lower product cost. It is an object of the present invention to provide a ceiling cassette type air conditioner capable of preventing condensation on a surface where the conditioner body is in contact with the air behind the ceiling.

The ceiling cassette type air conditioner according to the present invention has an air conditioner body that is embedded in the ceiling and accommodates a heat exchanger and a blower therein, a suction port and a blowout port, and a lower surface opening of the air conditioner body. The air conditioner main body is made of sheet metal, and the lower end of the air conditioner main body is bent inside the air conditioner main body and constitutes a flange portion that is screwed to the decorative panel. The flange portion has a decorative panel contact surface in contact with the decorative panel and a blown air contact surface in contact with the blown air blown from the blowout port, and the lower end of the air conditioner main body is an air conditioner provided with the flange portion. The ceiling air contact surface, the decorative panel contact surface, and the blowout air contact surface, which are the sides of the machine body, are formed in a substantially U-shaped cross section, and a heat insulating material is provided inside the ceiling air contact surface. ,make up Nell contact surface are those having screw holes for decorative panel fixing, and a slit hole for preventing heat transfer from the flange portion to the side sheet metal of an air conditioner body which is in contact with the ceiling air.

According to the present invention, since the flange portion is formed, the second moment of section is larger than that in the case where bending is not performed at all, and it is possible to have a necessary and sufficient strength against twisting and bending in the longitudinal direction. is there.
In addition, since it is possible to provide a screw hole for fixing the decorative panel by forming the flange portion, for example, compared to the case where another member with a screw hole is welded or screwed to the air conditioner body Installation can be maintained at a low product cost.
In addition, because the slits for preventing heat transfer are provided in the flange part, the low temperature of the flange part cooled by contact with cold air during cooling operation causes heat to the side sheet metal of the air conditioner body that is in contact with the air behind the ceiling. Can prevent transmission. Therefore, even when the ceiling back air is in a high temperature and humidity condition, it is possible to prevent dew condensation that occurs because the side sheet metal is cooled.

It is a schematic perspective view which shows the whole structure of the air conditioner main body and decorative panel in one embodiment of this invention. It is an expanded sectional view which shows the blower outlet periphery structure of the air conditioner main body of FIG. It is an expansion perspective view which shows the blower outlet periphery structure of the air conditioner main body of FIG.

FIG. 1 is a perspective view showing the overall configuration of an air conditioner main body and a decorative panel according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing the peripheral structure of the air conditioner main body of FIG. FIG. 3 is an enlarged perspective view showing the peripheral structure of the air conditioner main body of FIG.
In each figure, the outer casing of the air conditioner includes a box-shaped air conditioner body 1 having an open bottom, and a substantially rectangular decorative panel 2 that covers the lower surface opening of the air conditioner body 1. . The air conditioner body 1 is configured by assembling a plurality of sheet metals, and a heat exchanger, a blower, and the like are accommodated therein.

  The decorative panel 2 includes a blowing port 20a formed on one side of the four sides of the outer periphery so as to extend in the direction of the one side, and a vertical air direction adjusting vane 20 that adjusts the wind direction of the blowing air from the blowing port 20a. ing. A suction grill 21 is provided on the other side of the decorative panel facing the one side.

  Of the four side plates of the air conditioner main body 1, the lower end of the side plate on the outlet 20 a side of the decorative panel 2 (hereinafter, this side plate is referred to as the outlet side outer sheet metal) 11 is After being bent into an L shape once inside, the tip is further bent into an L shape to form a substantially U-shaped cross section. Thereby, the blower outlet side outer sheet metal 11 is formed with three surfaces of the ceiling back air contact surface 11a, the decorative panel contact surface 11b in contact with the decorative panel 2, and the blown air contact surface 11c in order from the outer surface side. As described above, the flange portion 3 is formed by bending the lower end of the outlet side outer sheet metal 11 to ensure strength against twisting and bending acting on the air conditioner main body.

  A plurality of screw holes 11d for fixing the decorative panel are provided in the decorative panel contact surface 11b of the outlet side outer sheet metal 11, and the decorative panel 2 is attached to the decorative panel by the screw holes 11d and the screws 12 for fixing the decorative panel. It is attached to the surface 11b. The decorative panel contact surface 11b is further provided with a plurality of elongated hole-like slit holes 11e for preventing heat transfer in the longitudinal direction.

  The blowing air contact surface 11c faces the blowing port 20a, and is affected by the cold air blown from the blowing port 20a during the cooling operation. For this reason, the slit hole 11e is provided in the decorative panel contact surface 11b so that the influence does not reach the ceiling back air contact surface 11a. In the air conditioner body 1, the lower end of the side sheet metal facing the outlet side outer sheet metal 11 is also bent inward from the surface for securing the strength, and the flange part 4 is formed. The slit hole 11e is not provided because it is not affected by cold air. Further, a heat insulating material 13 made of a material such as polystyrene foam is provided on the inner surface side of the blowout side outer sheet metal 11 to prevent condensation on the ceiling air contact surface 11a.

Next, the operation of the outer casing of the air conditioner will be described.
In the outer casing of the air conditioner configured as described above, the air (primary air) sucked from the suction grille 21 is activated by a heat exchanger (not shown) by operating the blower 13 during the cooling operation. The air is cooled when passing through the air, and the temperature becomes lower than that of the primary air. The air whose temperature has been lowered is guided by the up / down airflow direction adjusting vane 20 of the decorative panel 2 and blown out into the room through the outlet 20a. At that time, the blowout air contact surface 11c of the blowout side outer sheet metal 11 is cooled by being in contact with the blowout air. Therefore, although the ceiling back air contact surface 11a of the outlet side outer sheet metal 11 is also cooled by heat transfer, the decorative panel contact surface 11b is provided with the slit hole 11e, so that heat transfer to the decorative panel is suppressed. Is done. For this reason, even if the ceiling back air is in a condition such as high temperature and humidity, the ceiling back air contact surface 11a is not cooled to the dew point or lower, and condensation on the ceiling back air contact surface 11a can be prevented.

  As described above, since the flange portion 3 is formed by bending the lower end of the outlet side outer sheet metal 11 of the air conditioner main body 1 inward, the second moment of section is larger than the case where the bending is not performed at all. It is possible to have a necessary and sufficient strength against twisting or bending in the direction. Further, in this example, after bending once into an L shape, the tip is further bent into an L shape to form a substantially U-shaped cross section, so that higher strength is obtained.

  Further, since it is possible to provide a screw hole 11d for fixing the decorative panel on the decorative panel contact surface 11b of the outlet side outer sheet metal 11, for example, another member having a screw hole is welded to the outlet side outer sheet metal 11. Compared with the case of fixing with screws, it is possible to maintain the installation property at a lower product cost without increasing the size of the housing. Further, compared to a case where another member provided with a screw hole is integrally formed with the heat insulating material 13 and the like, it is possible to maintain the installation property at a lower product cost without increasing the size of the housing.

  Further, the blown air contact surface 11c of the blowout side outer sheet metal 11 is cooled by being in contact with the blown air during the cooling operation. However, in this example, a slit hole 11e is provided in the decorative panel contact surface 11b to prevent the low temperature of the decorative panel contact surface 11b and the blowout air contact surface 11c from transferring heat to the ceiling air contact surface 11a side. . For this reason, it is possible to prevent dew condensation that occurs because the ceiling back air contact surface 11a is cooled even when the ceiling back air is hot and humid. Therefore, as a countermeasure against condensation, for example, it is possible to prevent condensation at a lower product cost as compared with a countermeasure for increasing the heat insulation by increasing the thickness of the heat insulating material 13.

  In this example, an example in which a plurality of slit holes 11e are provided at intervals is shown, but a single elongated hole extending in the entire longitudinal direction may be used. In this case, the same effect can be obtained.

  Moreover, in this Embodiment, although the blower outlet 20a was arrange | positioned at the one side of the outer periphery 4 sides of the decorative panel 2, and the suction grille 21 was shown at the other side, the present invention showed The present invention can also be applied to an air conditioner of the type in which the outlet is arranged on each side of the outer peripheral four sides of the decorative panel and the suction grille is arranged at the center. In this case, a slit hole may be provided in each flange portion facing each outlet.

  DESCRIPTION OF SYMBOLS 1 Air conditioner main body, 2 Cosmetic panel, 3 Flange part, 4 Flange part, 11 Outlet side outer sheet metal, 11a Ceiling back air contact surface, 11b Makeup panel contact surface, 11c Outlet air contact surface, 11d Screw hole, 11e Slit hole, 12 screws, 13 heat insulating material, 14 blower, 20 up-and-down air direction adjusting vane, 20a outlet, 21 suction grille.

Claims (3)

An air conditioner main body embedded in the ceiling and containing a heat exchanger and a blower inside,
A decorative panel that has a suction port and a blowout port and covers a lower surface opening of the air conditioner body;
The air conditioner main body is made of sheet metal, and the lower end of the air conditioner main body forms a flange portion that is bent inside the air conditioner main body and fixed to the decorative panel by screws.
The flange portion has a decorative panel contact surface in contact with the decorative panel, and a blowout air contact surface in contact with blown air blown out from the blowout port,
The lower end of the air conditioner main body has a substantially U-shaped cross section at the ceiling air contact surface, which is the side surface of the air conditioner main body provided with the flange portion, the decorative panel contact surface, and the blowing air contact surface. Formed into a shape,
Inside the ceiling air contact surface is provided with a heat insulating material,
The decorative panel contact surface has a screw hole for fixing the decorative panel, and a slit hole for preventing heat transfer from the flange portion to a side metal plate of the air conditioner main body in contact with ceiling air. Characteristic ceiling cassette type air conditioner.   The ceiling cassette type air conditioner according to claim 1, wherein a plurality of the slit holes are formed in a longitudinal direction of the flange portion.   The ceiling cassette type air conditioner according to claim 1, wherein the slit hole is a single hole extending in a longitudinal direction of the flange portion.

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