JPH0765758B2 - Air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ceiling-embedded air conditioner in which a heat exchanger is arranged around the outer circumference of a centrifugal blower.

(Prior Art) FIGS. 2 to 4 of a conventional air conditioner of this type.
It will be described with reference to the drawings.

2 (a), (b) and (c) are a side sectional view, a plan sectional view and a side sectional view of a main part of a conventional air conditioner, respectively. 2 (a) and 2 (b), the ceiling-embedded air conditioner has an exposed portion including a square front panel 2 having a suction grille 1 in the center and inclined panels 4 having blowout slits 3 on the four sides thereof. And an octagonal side plate 8 and a bottom plate 9 accommodating a motor 6 for directly driving a vertical-axis centrifugal impeller 5 having a plurality of blades 5a and a heat exchanger 7 arranged so as to surround the centrifugal impeller 5 described above. It is composed of a buried part consisting of.

The inside of the front panel 2 is a partition plate 10 provided with a bellmouth-shaped opening 10a located at the center of the centrifugal impeller 5 described above.
The suction chamber 11 is formed by. On the upper surface of the partition plate 10, a substantially annular water tray 12 having a partition wall 12a reaching part of the bottom plate 9 is fixedly attached, and a cutout circle arranged along the jetty inside the water tray 12 A pressurizing chamber 13 is formed outside the centrifugal impeller 5 by the heat exchanger 7 and the partition wall 12a. The heat exchanger 7 and the partition
The blowing chamber 14 is formed between the inner wall surface of the side plate 8 and 12a.
Is connected by a blow-out passage 15 to a blow-out slit 3 provided in the inclined panel 4 at the exposed portion. The inner wall surfaces of the side plate 8 and the bottom plate 9 that form the blowout chamber 14 and the blowout passage
The inner surfaces of 15 are insulated 16 and 17 respectively to prevent condensation.
Is covered with.

In the space formed between the partition wall 12a and the side plate 8,
Although not shown in the figure, the medium inlet / outlet 7a of the heat exchanger 7 described above
And piping connected to 7b and a power supply plate, drain pump, etc. are arranged.

Further, as shown in FIG. 2 (c), the blowing slit 3 provided in the inclined panel 4 is provided with a rotating blade 18 for controlling the blowing direction.

The operation of the air conditioner thus configured will be described.

When the air conditioner embedded in the ceiling is turned on, the centrifugal impeller 5 driven by the electric motor 6 rotates and works as a centrifugal blower. The room air enters the suction chamber 11 through the suction grill 1 of the front panel 2 as shown by the arrow A, is further sucked into the centrifugal impeller 5 from the opening 10a of the partition plate 10, and is pressurized and pressurized. Enter room 13. Further, it passes between the heat exchangers 7 and absorbs heat during heating to become high-temperature air, and during cooling, it is deprived of heat to become low-temperature air and enters the blowout chamber 14 and then inclines through the blowout passage 15. From the blowout slit 3 provided in the panel 4, the air is blown out into the room as shown by an arrow B.

The rotary vanes 18 provided in the blow-out slits 3 of the four-sided inclined panel 4 are all directed downward as shown by the solid line in FIG. 2 (c) during heating, and upward as shown by the broken line during cooling. It is set. Therefore, at the time of heating, as shown by an arrow B (a) in FIG. 2 (c), it blows out in a substantially vertical direction. FIG. 3 (a) shows the flow of hot air in the room at this time. The air blown downward reaches the floor surface, and the air circling inward rises and the air from the suction grill 1 is conditioned. Return to the machine and heat the room.

At the time of cooling, the air is blown out in a substantially horizontal direction as shown by an arrow B (b) in FIG. 2 (c). FIG. 4 (a) shows the flow of low-temperature air in the room at this time. The horizontally blown air circulates downward along the wall surface, bypasses and returns from the intake grill 1 to the air conditioner. And cool the room.

(Problems to be Solved by the Invention) With the above configuration, as shown by the broken line in FIG. 4 (b) during cooling, the cold air drops downward, so the temperature inside the room is kept fairly uniform and relatively comfortable. However, warm air reaches the floor surface as shown by the solid line in Fig. 3 (b) when heating, and when the air velocity of the blowout is high, cold air remains in the upper part and becomes uneven at room temperature. When the wind speed is low, there is a problem that warm air does not reach the floor surface and the temperature at the feet does not rise, as shown by the broken line, and a comfortable heating state cannot be obtained.

The present invention solves the above problems and provides a ceiling-embedded air conditioner that provides a comfortable heating state with less temperature unevenness in the room.

(Means for Solving the Problems) In order to solve the above problems, the present invention is to make the blowing direction of at least one blowing slit of a plurality of blowing slits different from other blowing directions. is there.

(Operation) First, ADPI, which is an index that quantitatively represents the comfort of the living environment.
The value (Air Distribution Performance Index) is explained.

The ADPI value is calculated by grasping the indoor temperature and airflow distribution in the steady state during cooling and heating, and then calculating the thermal sensation and the comfort index of the entire room by the following formula.

The above T _θ is an effective draft temperature and is defined by the following equation.

T _θ = (t _x −t _c ) −7.66 (V _x −0.15) (2) where T _θ : Effective draft temperature ℃ t _x : Temperature at a certain measurement point in the living area ℃ t _c : Within the living area Set temperature ℃ V _x : Wind velocity <0.35 m / s at a certain measurement point in the living area When 80% of this effective draft temperature T _θ exceeds -1.67 and is less than 1.11 80% of residents feel comfortable Is informed. Therefore, the higher the ADPI value, the higher the comfort as the living environment.

FIG. 5 shows the relationship between the blowing angle and the ADPI value under heating conditions. The ADPI value is highest when the blowing angle is set near 78 °.

Fig. 6 shows the relation between the ratio of the blown air volume in the downward 75 ° direction to the total air volume and the ADPI value.
Highest ADPI when the ratio of blown air volume in the ° direction is 1: 1
It indicates that the value can be obtained.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The configuration of the ceiling-embedded air conditioner according to the present invention is the second aspect.
Since it is the same as the conventional example shown in FIGS. (A), (b) and (c), its description is omitted. However, in the present invention,
Rotating blades provided in the blowout slit 3 of the inclined panel 4
The 18 can be individually or manually rotated.

At the time of heating, two of the four blowout slits 3 are in the horizontal direction, the other two are in the downward 75 ° direction, or 1
Make only one part horizontal, or conversely, make three parts horizontal and the rest 75 ° downward.

FIG. 1 (a) shows the flow of warm air in the room by arrows, and its diffusion state, and FIG. 1 (b) shows the diffusion range of warm air by the solid line.

(Effects of the Invention) As described above, by individually moving the rotary vanes of the blowout slits to control the blowout direction, and dividing the blowout direction during heating into, for example, the horizontal direction and the downward 75 ° direction, You can increase the ADPI value and obtain a comfortable living space.

[Brief description of drawings]

1 (a) and 1 (b) are model diagrams showing the flow of warm air and the diffusion range of warm air when the ceiling-embedded air conditioner according to the present invention is used for heating, and FIGS. 2 (a) and 2 (b). ) And (c) are a side sectional view, a plan sectional view and a side sectional view of an essential part showing an embodiment of the present invention and a conventional example, respectively, and FIGS. Model diagram showing wind flow and diffusion range of warm air, Fig. 4 (a) and (b)
Is a model diagram showing the flow of cold air and the diffusion range of cool air during cooling in the conventional example. Fig. 5 is the hot air blowing angle of the blowing slit and AD.
FIG. 6 is a correlation diagram showing the relationship between PI values, and FIG. 6 is a correlation diagram showing the relationship between the ratio of the blown air volume in the downward 75 ° direction to the total air volume during heating and the ADPI value. 1 ... Suction grille, 2 ... Front panel, 3 ... Blowing slit, 4 ... Inclined panel, 5 ... Centrifugal impeller, 5a ...
... Blade, 6 ... Electric motor, 7 ... Heat exchanger, 7a, 7b ...
… Medium entrance / exit, 8 …… side plate, 9 …… bottom plate, 10 …… partition plate, 10a …… opening part, 11 …… suction chamber, 12 …… water tray, 1
2a ... Partition wall, 13 ... Pressurizing chamber, 14 ... Blowing chamber, 15 ... Blowing passage, 16,17 ... Insulating material, 18 ... Rotating blade.

Claims (1)

[Claims] 1. A centrifugal fan having a vertical axis driven by an electric motor,
A single heat exchanger or a plurality of heat exchangers arranged at a predetermined interval outside the blower, a suction port for sucking indoor air by the blower, and air whose temperature has been changed by the heat exchanger is blown out into the room. In an air conditioner including a plurality of outlets, at least one of the plurality of outlets has a blowing direction that is different from the blowing directions of the other outlets in the vertical direction. An air conditioner characterized by.