JPH04344029A - Ceiling buried type air conditioner - Google Patents

Abstract

PURPOSE:To provide a ceiling buried type air conditioner of low cost capable of performing an efficient heat exchanging operation. CONSTITUTION:A fan motor 26 is fixed outside a side wall 23 of a main body 11. An air inlet port 24 is disposed at a downstream side of a cross-flow fan 14, and in turn an air discharging port 25 is disposed at an upstream side. The air intake port 24 and the air discharging port 25 are communicated by a cooling passage holding the fan motor 26. In this way, the external fixed fan motor 26 is cooled with circulation flow generated within the cooling passage 27. As a result, a length of the cross-flow fan 14 is substantially equal to a length of the heat exchanger 13 to perform an efficient heat exchanging operation. In addition, the cross-flow fan 14 is set as one fan to realize a low cost.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-mounted air conditioner capable of forcibly cooling a fan motor of an indoor unit.

0002

[Prior Art] Conventionally, when cooling the fan motor of an indoor unit in an air conditioner, the atmosphere of the indoor unit that enters the indoor unit (in the case of a wall-mounted air conditioner or a floor-standing air conditioner, It is common practice to cool the fan motor by exposing it to indoor air. By the way, the indoor unit in a ceiling-embedded air conditioner must be installed behind the ceiling. However, the attic space is usually hotter and more humid than the room. Therefore, the fan motor cannot be cooled by exposing it to the hot and humid atmosphere of the indoor unit, as in the case of a wall-mounted air conditioner or a floor-standing air conditioner.

[0003] Therefore, in the case of an indoor unit of a ceiling-embedded air conditioner, the fan motor is cooled as shown in, for example, Japanese Utility Model Application Publication No. 62-63615. In the indoor unit of this ceiling-mounted air conditioner, as shown in FIG. It is blown out. Then, the air that has undergone heat exchange with the refrigerant while passing through the heat exchanger 4 is blown out into the room again from the outlet 5. Here, the fan motor 2 includes a plurality of cross flow fans 1,
It is located between 1,... By doing this,
The fan motor 2 is located in the air flow path from the suction port 3 to the blowout port 5, and is cooled by indoor air.

0004

[Problem to be Solved by the Invention] However, in the above conventional indoor unit of the ceiling-mounted air conditioner, the fan motor 2 must be placed between the plurality of cross-flow fans 1, 1, . There are the following problems. In other words, since a plurality of cross flow fans 1, 1, ... are arranged coaxially, many bearings, covers, etc. are required, which increases the overall length and increases the number of locations where condensation countermeasures are required at the air outlet 5, which increases costs. It becomes a factor. Furthermore, since there are many parts that do not contribute to the forced circulation of air, there is a problem that indoor air cannot be sufficiently supplied over the entire length of the heat exchanger 4, resulting in a decrease in heat exchange efficiency.

[0005] Therefore, an object of the present invention is to eliminate the need for disposing the fan motor in the indoor unit in the air flow path, and to
The purpose of the present invention is to provide a ceiling-embedded air conditioner that can perform efficient heat exchange at low cost.

[0006]

[Means for Solving the Problems] In order to achieve the above object, a ceiling-embedded air conditioner of the present invention is provided as shown in FIGS. 1 and 2.
As illustrated in FIG. The air intake port 24 provided in the side wall 23
An air outlet 25 provided upstream of the cross flow fan 14 and the fan motor 26 inside.
It is characterized by having a cooling passage 27 which encloses the air intake port 24 and the air outlet port 25 and smoothly communicates with the air intake port 24 and the air outlet port 25.

[0007]

[Operation] Cross flow fan 1 housed in main body 11
4 is driven by a fan motor 26 attached to the outside of the side wall 23 of the main body 11, the main body 11
This creates a flow of indoor air with controlled temperature and humidity. Then, the pressure on the downstream side of the fan motor 26 becomes positive, while the pressure on the upstream side becomes negative. Then, the air intake port 24 provided on the downstream side of the cross flow fan 14 in the side wall 23 and the air outlet port 25 provided on the upstream side
A pressure difference is generated between the two, and this pressure difference causes a circulating flow of the indoor air in the cooling passage 27 that smoothly communicates the air intake port 24 and the air outlet 25. At this time, since the fan motor 26 is held inside the cooling passage 27, the fan motor 26
6 is forcibly cooled by a circulating flow of indoor air whose temperature and humidity have been adjusted. Therefore, it is not necessary to install the fan motor 26 in the main air flow path in the main body 11 in order to cool the fan motor 26, and a single cross-hoo fan can supply indoor air throughout the heat exchanger, thereby increasing efficiency. Good heat exchange is performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to illustrated embodiments. FIG. 1 is a sectional view of an indoor unit of a ceiling-embedded air conditioner in this embodiment. This indoor unit is installed with the main body 11 inserted into a mounting hole 21 provided in the ceiling 20, the periphery of the panel 12 fixed to the ceiling 20, and the main body 11 exposed on the back side of the ceiling where it is hot and humid. Above panel 12
A suction port 17 extending in the longitudinal direction is provided on one side, and a grill 15 and an air filter 16 are stacked and arranged in this suction port 17 in order from the indoor side. On the other hand, there is an air outlet 1 on the other side.
8 is provided in parallel with the suction port 17, and a flap 19 is provided at the blowout port 18 so as to be openable and closable.

On the other side of the main body 11, there is a
A cross-flow fan 14 is arranged parallel to the air outlet 18. Further, between the opening 22 in the main body 11 and the cross-flow fan 14, a heat exchanger 13 for exchanging heat with indoor air is arranged in parallel with the cross-flow fan 14. Therefore, when the cross-flow fan 14 is driven, indoor air is forcedly circulated through the suction port 17, the heat exchanger 13, the cross-flow fan 14, and the air outlet 18. An airflow directed toward the outlet 18 is formed via the crossflow fan 14.

As shown in FIG. 2, the cross flow fan 14 is formed to have approximately the same length as the heat exchanger 13, and is driven by a fan motor 26 attached to the outside of the side wall 23 of the main body 11. . By doing so, a sufficient amount of indoor air can be supplied over the entire length of the heat exchanger 13, and heat exchange can be performed efficiently. Here, in FIG. 2, the suction port 17, the heat exchanger 13, and the blowout port 18 are simplified.
The representation is made to make it easier to understand the flow of air.

[0011] The side walls and upper wall constituting the outer shell of the main body 11 are formed so as to be isolated from the air in the attic, and are further insulated with a heat insulating material or the like. By doing this,
This prevents dew condensation inside the main body 11 during cooling due to hot and humid air in the attic intruding into the main body 11 or the temperature of the air in the attic being conducted into the main body 11.

Further, an air intake port 24 is provided on the downstream side of the cross flow fan 14 in the side wall 23 of the main body 11 in which the fan motor 26 is installed, and an air outlet port 25 is provided on the upstream side. And side wall 2
A cooling passage 27 is formed on the outside of 3 to communicate the air intake port 24 and the air discharge port 25, and to hold a fan motor 26 for driving the cross flow fan 14 therein.
will be established.

In the indoor unit of the ceiling-mounted air conditioner configured as described above, when the cross-flow fan 14 is driven by the fan motor 26, the indoor air taken in from the suction port 17 passes through the air filter 16. is supplied to the heat exchanger 13 via. Then, heat exchange is performed with the refrigerant in the heat exchanger 13. In this way, the indoor air whose temperature and humidity have been adjusted by radiating or absorbing heat is discharged through the air outlet 18.
Then, the air is blown into the room again in the direction set by the flap 19.

At this time, the upstream side where air is sucked in by the cross flow fan 14 becomes negative pressure, while the downstream side where air is blown out becomes positive pressure. Therefore, a pressure difference is created between the air intake port 24 and the air outlet 25,
As shown in FIG. 2, a part of the air blown out from the cross-flow fan 14 is taken into the cooling passage 27 from the air intake port 24, circulates around the motor 26, and flows through the cross-flow fan 14 from the air outlet 25. It is discharged upstream. In this way, the fan motor 26 is forcibly cooled by generating a circulation flow (arrow (A)) around the fan motor 26 using air whose temperature and humidity have been adjusted.

[0015] Therefore, the shape and configuration of the cooling passage 27 that communicates the air intake port 24 and the air exhaust port 25 greatly affects the cooling efficiency of the fan motor 26. Therefore, the shape of the cooling passage 27 is determined by the fan motor 2.
It is necessary to completely surround the fan motor 26 from the top, bottom, right and left so that the circulating flow flows around the fan motor 26. Further, if air from the ceiling enters into the cooling passage 27, dew condensation will occur around the cross flow fan 14 and the air outlet 18 during cooling. Therefore, the cooling passage 27 also needs to be formed so as to be isolated/insulated from the air in the attic.

As described above, in this embodiment, the fan motor 26 for driving the cross-flow fan 14 is attached to the outside of the side wall 23 of the main body 11. An air intake port 24 is provided on the downstream side (positive pressure side) of the cross flow fan 14.
An air outlet 25 is provided on the upstream side (negative pressure side). The air intake port 24 and the air discharge port 25 are smoothly communicated by a cooling passage 27 formed to enclose the fan motor 26 therein. Therefore, by driving the cross-flow fan 14, a circulating flow from the air intake port 24 toward the air outlet 25 is generated in the cooling passage 27. As a result, the fan motor 26 is sufficiently cooled by the air whose temperature and humidity have been adjusted by the heat exchanger 13.

Further, in this embodiment, the fan motor 26 for driving the cross flow fan 14 is connected to the main body 11.
It is installed outside the side wall 23 of. Therefore, it is not necessary to install the fan motor 26 in the main air flow path, and the length of the cross flow fan 14 can be made the same as the length of the heat exchanger 13. Therefore, the suction port 17
This allows efficient heat exchange by supplying the indoor air that has flowed in over the entire length of the heat exchanger 13. Also,
Since there is no need to connect multiple cross-flow fans, there are fewer bearings, etc., and the overall length is shortened, reducing the number of points to prevent condensation, which together with reducing costs.

In the above embodiment, the cross flow fan 14 is disposed downstream of the heat exchanger 13, but it may be disposed upstream of the heat exchanger 13 without any problem. In either case, as described above, each side wall and top wall of the main body 11 and the cooling passage 27 are sufficiently isolated/insulated from the air in the attic, so that the circulating flow within the cooling passage 27 maintains temperature and humidity. The fan motor 26 is reliably cooled by the regulated indoor air. In the above embodiment, since the air downstream of the cross-flow fan 14 is circulated upstream, the pressure on the negative pressure side becomes higher than in the conventional case, and the suction port 1
7, the amount of air inhaled decreases. As a result, the amount of air discharged from the air outlet 18 also decreases. However, the loss in discharge air volume as mentioned above is 1% to 2% as a result of actual measurements.
%, so there is no problem.

[0019]

[Effects of the Invention] As is clear from the above, in the ceiling-mounted air conditioner of the present invention, the fan motor is mounted outside the side wall of the main body, and the air conditioner provided on the downstream side of the cross flow fan on the side wall Since the intake port and the air exhaust port provided on the upstream side are communicated with each other through a cooling passage that houses the fan motor inside, the air intake port and the air exhaust port provided on the upstream side are connected to each other by the cooling passage that contains the fan motor. The fan motor can be forcibly cooled by the circulating flow within the cooling passage generated by the differential pressure. Therefore, according to the present invention, there is no need to arrange the fan motor in the main flow path, and efficient heat exchange can be performed at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of an indoor unit of a ceiling-embedded air conditioner according to the present invention.

FIG. 2 is a conceptual diagram showing a cooling passage that communicates an air intake port and an air outlet in FIG. 1;

FIG. 3 is a schematic perspective view of a conventional ceiling-embedded air conditioner.

[Explanation of symbols]

11...Main body,
12... Panel, 13... Heat exchanger,
14...Cross flow fan, 17...Suction port,
18...Air outlet,
20...ceiling,
23...Side wall, 24...Air intake port, 25...
Air outlet, 26...fan motor,
27...Cooling passage.

Claims (1)

[Claims] 1. A fan motor (26) that is attached to the outside of a side wall (23) of a main body (11) housing a cross flow fan (14) and that drives the cross flow fan (14), and a fan motor (26) that drives the cross flow fan (14); (23), an air intake port (24) provided on the downstream side of the cross flow fan (14); and an air outlet (24) provided on the side wall (23), provided on the upstream side of the cross flow fan (14). 25) and the fan motor (26) therein, as well as the air intake port (24) and the air outlet (24).
5) A ceiling-embedded air conditioner characterized by comprising a cooling passage (27) that smoothly communicates with the air conditioner.