Air conditioner

FIELD OF THE INVENTION

The present invention relates to an air conditioner, and more particularly relates to an air conditioner installed so that it is embedded in the ceiling of an air conditioned room.

RELATED ART

A so-called conventional ceiling embedded type air conditioner installed so that it is embedded in the ceiling of an air conditioned room principally comprises: a casing having a casing lower part formed by an alternating sequence of a plurality of side parts and a plurality of corner parts; outlets disposed so that each runs along a side part and an inlet disposed so that it is surrounded by the side parts; and a fan and a heat exchanger disposed inside the casing.

Furthermore, when this type of an air conditioner operates, the air inside the air conditioned room flows from the space below the inlet toward the inlet and is sucked inside the casing through the inlet. Then, the heat of the air sucked into the casing is exchanged by the heat exchanger, and is subsequently blown out through the outlets from the vicinity of the ceiling of the air conditioned room downward and diagonally into the air conditioned room. Here, the majority of the air currents blown out from inside the casing through the outlets reaches a far-off distance from the air conditioner, but a portion of the air currents blown out from inside the casing through the outlets is sucked into the inlet immediately after being blown out. Such a phenomenon is referred to as a short circuit, and the performance of the air conditioner drops if this short circuit increases (namely, if there is an increase in the flow volume of the air sucked into the inlet immediately after being blown out from inside the casing through the outlets).

In contrast, it is known to reduce short circuits by providing a plurality of outlets inside the casing except at the portions where both end parts of the heat exchanger are disposed, and by ensuring passageways wherein air flows from the outer circumferential side of the inlet toward the inlet-not only in the space below the inlet, but also in the portions where the outlets are not provided (e.g., refer to Patent Document 1).

However, although it is possible with such an air conditioner to ensure passageways at the portions where outlets are not provided and wherein air flows from the outer circumferential side of the inlet toward the inlet, short circuits occur outside of these portions at the portions between the outlets, and it is therefore preferable to further reduce short circuits at such portions. In contrast, it is conceivable to reduce the number of outlets by increasing the space between the outlets, reducing the opening area of the outlets, and the like; however, doing so will increase the flow speed of the air currents blown out from the outlets, thereby increasing drafts.

Patent Document 1

Japanese Published Patent Application No. 2001-116281

DISCLOSURE OF THE INVENTION

It is an object of the present invention to reduce short circuits in a ceiling embedded type air conditioner, without increasing drafts due to air currents blown out from outlets.

An air conditioner according to the first invention is an air conditioner installed embedded in the ceiling of an air conditioned room, comprising a casing and a fan. The casing comprises: a casing lower part formed by an alternating sequence of a plurality of side parts and a plurality of corner parts; side part outlets disposed along each of the side parts; corner part outlets disposed at at least one of the plurality of corner parts; and an inlet disposed so that it is surrounded by all of the side parts. The fan, disposed inside the casing, sucks in air from the inlet into the casing, and blows out the sucked in air from the side part outlets and the corner part outlets into the air conditioned room. The dimensional relationship between each corner part outlet and the side part outlets adjacent to that corner part outlet is:

D/(L₁W₁+S₂)^0.5>0.15

where D is the distance between a first proximate part, which is the most proximate part of each corner part outlet to each side part outlet, and a second proximate part, which is the most proximate part of each side part outlet to each corner part outlet, L₁is the length of each side part outlet in the direction along an outer circumferential edge of the side part, W₁is the width of each side part outlet in the direction orthogonal to the outer circumferential edge of the side part, and S₂is the opening area of each corner part outlet.

To prevent an increase in drafts due to the formation of a corner part outlet at each corner part between side part outlets in a ceiling embedded type air conditioner disposed so that the side part outlets surround the inlet, the present inventor(s) conducted research on the spacing between each corner part outlet and the side part outlets adjacent to that corner part outlet with the capability so that the air currents blown out toward the inside of the air conditioned room from the corner part outlets and the side part outlets from the portions between each corner part outlet and the side part outlets adjacent to that corner part outlet do not short circuit to the inlet, i.e., a spacing at the portions between each corner part outlet and the side part outlets adjacent to that corner part outlet capable of ensuring passageways for the air sucked into the inlet from the outer circumferential side of the inlet.

As a result, a dimensional relationship formula for the abovementioned spacing between each corner part outlet and the side part outlets adjacent to that corner part outlet was identified. This relationship formula can determine the minimum spacing, in accordance with the opening size of the side part outlets and the corner part outlets, that can reduce short circuits.

Thereby, with this air conditioner, the corner part outlets can be disposed with an appropriate spacing in accordance with the opening size of the side part outlets adjacent to those corner part outlets; consequently, it is possible to ensure passageways for the air sucked into the inlet from the outer circumferential side of the inlet, even at the portions between each corner part outlet and the side part outlets adjacent to that corner part outlet. Thereby, short circuits can be reduced without increasing drafts.

An air conditioner according to the second invention is an air conditioner as recited in the first invention, wherein the opening area of each corner part outlet is less than the opening area of each side part outlet.

With this air conditioner, the flow speed of the air blown out from each side part outlet does not decrease significantly, and the air current blown out from each side part outlet can consequently reach as far as possible. Moreover, because the flow speed of the air blown out from each corner part outlet is low, and a difference is created in the reach between the air current blown out from each corner part outlet and the air current blown out from each side part outlet, it is possible to ensure passageways, below the air current blown out from each corner part outlet, for the air sucked into the inlet.

An air conditioner according to the third invention is an air conditioner as recited in the first invention or the second invention, wherein the two side part outlets adjacent to both sides of each of the corner part outlets are disposed so that they are substantially mutually orthogonal.

With this air conditioner, it is possible to dispose the side part outlets and the corner part outlets with an appropriate spacing in accordance with their opening sizes for the case wherein the casing lower part, in a plan view, is substantially rectangular or square shaped; consequently, it is also possible to ensure passageways, between mutually adjacent side part outlets and corner part outlets, for the air sucked into the inlet. Thereby, short circuits can be reduced without increasing drafts.

An air conditioner according to the fourth invention is an air conditioner as recited in any one invention of the first invention through the third invention, wherein circumferential edge parts of each corner part outlet are formed so that an air current blown out from each corner part outlet is blown out in a direction away from an air current blown out from each of the adjacent two side part outlets.

With this air conditioner, it is even easier to ensure passageways, between each corner part outlet and the side part outlets adjacent to that corner part outlet, for the air sucked into the inlet.

An air conditioner according to the fifth invention is an air conditioner as recited in any one invention of the first invention through the third invention, wherein each corner part outlet is provided with a guide flap that guides the air current blown out from each corner part outlet so that it blows out away from the air current blown out from each of the adjacent two side part outlets.

With this air conditioner, it is even easier to ensure passageways, between each corner part outlet and the side part outlets adjacent to that corner part outlet, for the air sucked into the inlet.

BRIEF EXPLANATION OF DRAWINGS

FIG. 1 is an external perspective view of an air conditioner according to one embodiment of the present invention.

FIG. 2 is a schematic side cross sectional view of the air conditioner, and is a cross sectional view taken along the A-O-A line in FIG. 3.

FIG. 3 is a schematic plan cross sectional view of the air conditioner, and is a cross sectional view taken along the B-B line in FIG. 2.

FIG. 4 is a plan view of a face panel of the air conditioner, viewed from inside the air conditioned room.

FIG. 5 is an enlarged view of FIG. 2, and depicts the vicinity of a main outlet passageway corresponding to a main outlet.

FIG. 6 is an enlarged view of FIG. 2, and depicts the vicinity of an auxiliary outlet passageway corresponding to an auxiliary outlet.

FIG. 7 is an enlarged view of FIG. 3, and depicts the vicinity of an auxiliary outlet passageway corresponding to an auxiliary outlet.

FIG. 8 is an enlarged view of FIG. 4, and depicts the vicinity of an auxiliary outlet (a partial broken view of a panel lower surface part).

FIG. 9 is a schematic plan cross sectional view of the air conditioner according to another embodiment, and is a view that corresponds to FIG. 3.

FIG. 10 depicts the vicinity of an auxiliary outlet passageway corresponding to an auxiliary outlet according to another embodiment, and is a view that corresponds to FIG. 7.

EXPLANATION OF SYMBOLS

1 Air conditioner

2 Casing

3 Face panel (casing lower part)

4 Fan

7 Drain pan (casing lower part)

12
a-12d Main outlet passageways (side part outlets)

12
e-12h Auxiliary outlet passageways (corner part outlets)

30
a-30d Panel side parts (side parts)

30
e-30h Panel corner parts (corner parts)

31 Inlet

74, 75 End surfaces (circumferential edge parts)

76 Guide flaps

D Distance

L₁Length

P Point (first proximate part)

Q Side (second proximate part)

S₂Opening area

W₁Width

PREFERRED EMBODIMENTS

The following explains the embodiments of an air conditioner according to the present invention, referencing the drawings.

(1) Basic Constitution of the Air Conditioner

FIG. 1 is an external perspective view of an air conditioner 1 according to one embodiment of the present invention (ceiling is not shown). The air conditioner 1 is a ceiling embedded type air conditioner, and comprises a casing 2 that internally houses various constituent equipment. The casing 2 comprises a casing main body 2a, and a face panel 3 disposed on the lower side of the casing main body 2a. As shown in FIG. 2, the casing main body 2a is disposed inserted into an opening formed in a ceiling U of the air conditioned room. Furthermore, the face panel 3 is disposed so that it is fitted into the opening of the ceiling U. Here, FIG. 2 is a schematic side cross sectional view of the air conditioner 1, and is a cross sectional view taken along the A-O-A line in FIG. 3.

As shown in FIG. 2 and FIG. 3, the casing main body 2a is, in a plan view thereof, a box shaped body whose substantially octagonal lower surface is open and formed by alternating long sides and short sides, and comprising: a substantially octagonal top plate 21 formed by an alternating sequence of long sides and short sides; and a side plate 22 extending downward from a circumferential edge part of the top plate 21. Here, FIG. 3 is a schematic plan cross sectional view of the air conditioner 1, and is a cross sectional view taken along the B-B line in FIG. 2.

The side plate 22 comprises side plates 22a, 22b, 22c, 22d corresponding to the long sides of the top plate 21, and side plates 22e, 22f, 22g, 22h corresponding to the short sides of the top plate 21. Here, for example, the side plate 22d and the side plate 22a are disposed so that they are mutually substantially orthogonal with the side plate 22e interposed therebetween. The other side plates 22a, 22b, side plates 22b, 22c, and side plates 22c, 22d are likewise disposed so that they are mutually substantially orthogonal, the same as the side plates 22d, 22a. In addition, the side plate 22e is disposed so that an angle a formed between the adjoining side plate 22d and side plate 22a is approximately 135°. The side plates 22f, 22g are also disposed so that the angle formed between the adjoining side plates is approximately 135°, the same as the side plate 22e. Furthermore, the side plate 22h is shaped differently than the other side plates 22e, 22f, 22g, and comprises a portion wherethrough passes a refrigerant piping for exchanging refrigerants between a heat exchanger 6 (discussed later) and an outdoor unit (not shown). In addition, each of the side plates 22e, 22f, 22g, 22h is provided with a fixing bracket 23 used when installing the casing main body 2a in the space above the ceiling. Further, the lengths of the long sides and the short sides of the top plate 21 are set so that, in a plan view, the shape of the casing main body 2a including the fixing brackets 23 becomes substantially quadrilateral.

The face panel 3 is a substantially quadrilateral plate shaped body, in a plan view, as shown in FIG. 2, FIG. 3, and FIG. 4, and principally comprises a panel main body 3a fixed to a lower end part of the casing main body 2a. Here, FIG. 4 is a plan view of the face panel 3 of the air conditioner 1, viewed from inside the air conditioned room.

The panel main body 3a is formed by an alternating sequence of a plurality (four in the present embodiment) of panel side parts 30a, 30b, 30c, 30d (side parts) and a plurality (four in the present embodiment) of panel corner parts 30e, 30f, 30g, 30h (corner parts). The panel side parts 30a, 30b, 30c, 30d are disposed so that they correspond respectively to the side plates 22a, 22b, 22c, 22d of the casing main body 2a. The panel corner parts 30e, 30f, 30g, 30h are disposed so that they correspond respectively to the side plates 22e, 22f, 22g, 22h of the casing main body 2a.

The panel main body 3a comprises: an inlet 31 that, substantially at the center thereof, sucks in the air inside the air conditioned room, and a plurality (four in the present embodiment) of main outlets 32a, 32b, 32c, 32d formed corresponding respectively to the panel side parts 30a, 30b, 30c, 30d and that blow the air from inside the casing main body 2a out into the air conditioned room. The inlet 31 is a substantially square shaped opening in the present embodiment. The four main outlets 32a, 32b, 32c, 32d are substantially rectangular shaped openings that elongatingly extend so that they respectively run along the panel side parts 30a, 30b, 30c, 30d.

In addition, at the lower surface of the panel main body 3a is provided a square annular panel lower surface part 3b disposed so that it is surrounded by the inlet 31 and surrounds the four main outlets 32a, 32b, 32c, 32d. The panel lower surface part 3b comprises edge parts on the inlet 31 side of the main outlets 32a, 32b, 32c, 32d. Specifically, outer circumferential edge parts 39a, 39b, 39c, 39d corresponding to the four sides of the panel lower surface part 3b are disposed so that, in a plan view of the face panel 3, they overlap with portions of the main outlets 32a, 32b, 32c, 32d on the inlet 31 side.

Furthermore, an inlet grill 33, and a filter 34 for eliminating dust in the air sucked in from the inlet 31 are provided at the inlet 31.

In addition, horizontal flaps 35a, 35b, 35c, 35d (horizontal flaps) capable of oscillating about an axis in the longitudinal direction are respectively provided at the main outlets 32a, 32b, 32c, 32d. The horizontal flaps 35a, 35b, 35c, 35d are substantially rectangular shaped flap members elongatedly extending in the longitudinal direction of the respectively corresponding main outlets 32a, 32b, 32c, 32d, and linking pins 36 are respectively provided in the vicinity of both end parts in the longitudinal direction thereof. Furthermore, the horizontal flaps 35a, 35b, 35c, 35d are each rotatably supported to the face panel 3 by the linking pins 36, making them oscillatable about the axes of the main outlets 32a, 32b, 32c, 32d in the longitudinal direction. In the three panel corner parts 30e, 30g, 30h, excepting the panel corner part 30f, a linking shaft 37 serves as a link mechanism by mutually linking the adjoining linking pins 36. Taking the panel corner part 30e as an example, a linking shaft 37 links the linking pin 36 on the panel corner part 30e side of the horizontal flap 35d and the linking pin 36 on the panel corner part 30e side of the horizontal flap 35a so that they rotate by the rotation of the linking shaft 37. In addition, a drive shaft of a motor 38 is linked to the linking shaft 37 disposed in the panel corner part 30h. Thereby, driving the motor 38 synchronously oscillates the four horizontal flaps 35a, 35b, 35c, 35d vertically via the linking shafts 37, and via the linking pins 36 provided to the horizontal flaps 35a, 35b, 35c, 35d. Furthermore, oscillating these horizontal flaps 35a, 35b, 35c, 35d enables the wind direction of an air current X blown out from each of the main outlets 32a, 32b, 32c, 32d into the air conditioned room to be varied.

For example, as shown in FIG. 5, the wind direction of the air current X blown out from the main outlet 32b into the air conditioned room is varied in the vertical direction from an angle β₁to an angle β₂with respect to the lower surface of the ceiling U by the horizontal flap 35b. The wind direction of the air current blown out from each of the other main outlets 32a, 32c, 32d into the air conditioned room are likewise varied in the vertical direction from the angle β₁to the angle β₂with respect to the lower surface of the ceiling U, the same as the wind direction of the air current X blown out from the main outlet 32b into the air conditioned room. Here, FIG. 5 is an enlarged view of FIG. 2, and depicts the vicinity of a main outlet passageway 12b (discussed later) corresponding to the main outlet 32b.

Principally disposed inside the casing main body 2a are: a fan 4 that sucks the air inside the air conditioned room through the inlet 31 of the face panel 3 into the casing main body 2a, and blows the same out in the outer circumferential direction; and a heat exchanger 6 disposed so that it surrounds the outer circumference of the fan 4.

The fan 4 in the present embodiment is a turbofan, and comprises: a fan motor 41 provided in the center of the top plate 21 of the casing main body 2a; and an impeller 42 linked to and rotatably driven by the fan motor 41. The impeller 42 comprises: a disc shaped end plate 43 linked to the fan motor 41; a plurality of blades 44 provided at the outer circumferential part of the lower surface of the end plate 43; and a disc shaped end ring 45 provided on the lower side of the blade 44 and having an opening at the center. The fan 4 can suck in air through the opening of the end ring 45 to the interior of the impeller 42 by the rotation of the blades 44, and can blow out the air sucked into the impeller 42 to the outer circumferential side of the impeller 42.

In the present embodiment, the heat exchanger 6 is a cross finned tube type heat exchanger panel formed bent so that it surrounds the outer circumference of the fan 4, and is connected via the refrigerant piping to the outdoor unit (not shown) installed outdoors, and the like. The heat exchanger 6 can function as an evaporator of the refrigerant flowing internally during cooling operation, and as a condenser of the refrigerant flowing internally during heating operation. Thereby, the heat exchanger 6 exchanges heat with the air sucked in by the fan 4 through the inlet 31 into the casing main body 2a, and can cool the air during cooling operation and heat the air during heating operation.

A drain pan 7 is disposed on the lower side of the heat exchanger 6 for receiving drain water generated by the condensation of water in the air in the heat exchanger 6. The drain pan 7 is attached to the lower part of the casing main body 2a. The drain pan 7 comprises: an inlet hole 71 formed so that it communicates with the inlet 31 of the face panel 3; four main outlet holes 72a, 72b, 72c, 72d formed so that they communicate with the main outlets 32a, 32b, 32c, 32d of the face panel 3; and a drain water receiving groove 73 formed on the lower side of the heat exchanger 6 and that receives the drain water. Here, the main outlet holes 72a, 72b, 72c, 72d are shorter than the lengths of the respective corresponding main outlets 32a, 32b, 32c, 32d in the longitudinal direction. In particular, the main outlet hole 72c is shorter than the lengths of the other main outlet holes 72a, 72b, 72d in the longitudinal direction because it is interposed between: a drain pump 8 for discharging the drain water collected in the drain water receiving groove 73 disposed on the side plate 22g side; and the portion through which the refrigerant piping passes on the side plate 22h side.

Furthermore, with the inlet 31 of the face panel 3, the inlet hole 71 forms an inlet passageway that serves as the substantial inlet that sucks in the air inside the air conditioned room into the casing main body 2a. In addition, the main outlet holes 72a, 72b, 72c, 72d, in conjunction with the main outlets 32a, 32b, 32c, 32d of the face panel 3, which communicate respectively therewith, form main outlet passageways 12a, 12b, 12c, 12d that serve as the substantial main outlets that blow out the air whose heat was exchanged in the heat exchanger 6 into the air conditioned room. In other words, with the air conditioner 1 of the present embodiment, the lower part of the casing 2 comprises the face panel 3 and the drain pan 7, and at the lower part of this casing 2 are formed the inlet passageway and main outlet passageways 12a, 12b, 12c, 12d (side part outlets) that serve as the substantial inlet and main outlets.

In addition, a bell mouth 5 for guiding the air sucked in from the inlet 31 to the impeller 42 of the fan 4 is disposed in the inlet hole 71 of the drain pan 7.

(2) Auxilliary Outlet Structure, and Peripheral Configuration Thereof

The air conditioner 1 having the basic constitution as described above further comprises a plurality (four in the present embodiment) of auxiliary outlets 32e, 32f, 32g, 32h formed so that they correspond respectively to the panel corner parts 30e, 30f, 30g, 30h of the face panel 3, and that blow the air from inside the casing main body 2a out into the air conditioned room, as shown in FIG. 1 through FIG. 7. Here, FIG. 6 is an enlarged view of FIG. 2, and depicts the vicinity of the auxiliary outlet passageway 12e (discussed later) corresponding to the auxiliary outlet 32e. FIG. 7 is an enlarged view of FIG. 3, and depicts the vicinity of the auxiliary outlet passageway 12e corresponding to the auxiliary outlet 32e.

The four auxiliary outlets 32e, 32f, 32g, 32h are, in a plan view of the face panel 3, substantially rectangular shaped openings formed so that they respectively run along the side plates 22e, 22f, 22g, 22h of the casing main body 2a.

In addition, the portions of the auxiliary outlets 32e, 32f, 32g, 32h on the inlet 31 side are disposed, in a plan view of the face panel 3, so that they overlap the outer circumferential corner parts 39e, 39f, 39g, 39h between the outer circumferential edge parts 39a, 39b, 39c, 39d of the panel lower surface part 3b. Consequently, the panel lower surface part 3b comprises not only the edge parts of the main outlets 32a, 32b, 32c, 32d on the inlet 31 side, but also the edge parts of the auxiliary outlets 32e, 32f, 32g, 32h on the inlet 31 side. Further, the surfaces on the auxiliary outlets 32e, 32f, 32g, 32h side of these outer circumferential corner parts 39e, 39f, 39g, 39h are formed so that the air blown out from each of the auxiliary outlets 32e, 32f, 32g, 32h into the air conditioned room is blown out in an inclined, downward, fixed direction.

Moreover, a horizontal flap for varying the wind direction of the blown-out air current is not provided at each of the auxiliary outlets 32e, 32f, 32g, 32h, unlike the main outlets 32a, 32b, 32c, 32d. Further, for example, as shown in FIG. 6, the wind direction of the air current blown out from the auxiliary outlet 32e into the air conditioned room is a direction formed by the angle γ(≈β1/2+β2/2), which is the direction of substantially the middle of the range by which the horizontal flaps 35d, 35a provided at the adjoining main outlets 32d, 32a regulate in the vertical direction the wind direction of the air current blown out from each of the main outlets 32d, 32a (specifically, the range from the angle β1 to the angle β2 with respect to the lower surface of the ceiling U). The wind direction of the air current blown out from each of the other auxiliary outlets 32f, 32g, 32h into the air conditioned room are also the direction formed by the angle γ with respect to the lower surface of the ceiling U, the same as the wind direction of the air current Y blown out from the auxiliary outlet 32e into the air conditioned room.

In addition, the drain pan 7 further comprises three auxiliary outlet holes 72e, 72f, 72g formed so that they communicate with the auxiliary outlets 32e, 32f, 32g of the face panel 3. Here, in the present embodiment, an auxiliary outlet hole is not formed at the position corresponding to the auxiliary outlet 32h of the face panel 3 of the drain pan 7. Consequently, in the present embodiment, the auxiliary outlet 32h of the face panel 3 does not have the function of blowing the air sucked into the casing main body 2a out toward the inside of the air conditioned room. Here, the auxiliary outlet hole 72e is substantially the same length as the corresponding auxiliary outlet 32e in the longitudinal direction, but the auxiliary outlet hole 72f is shorter than the length of the corresponding auxiliary outlet 32f in the longitudinal direction because one part of the drain water receiving groove 73 protrudes on the side plate 22a side. In addition, the auxiliary outlet hole 72g is shorter than the length of the corresponding auxiliary outlet 32g in the longitudinal direction because the drain pump 8 is disposed on the side plate 22c side.

Furthermore, the three auxiliary outlet holes 72e, 72f, 72g, in conjunction with the auxiliary outlets 32e, 32f, 32g of the face panel 3, which communicates therewith, form three auxiliary outlet passageways 12e, 12f, 12g that blow the air whose heat was exchanged in the heat exchanger 6 out into the air conditioned room. In other words, with the air conditioner 1 of the present embodiment, the following are formed at the lower part of the casing 2 comprising the face panel 3 and the drain pan 7: the inlet passageway and the main outlet passageways 12a, 12b, 12c, 12d that serve as the substantial inlet and main outlets; and the auxiliary outlet passageways 12e, 12f, 12g (corner part outlets) that serve as the substantial auxiliary outlets.

If the auxiliary outlet passageways 12e, 12f, 12g are provided between the main outlet passageways 12a, 12b, 12c, 12d in this manner, then the inlet 31 becomes surrounded by these outlet passageways, making it difficult to ensure a passageway for the air sucked in from inside the air conditioned room into the casing 2; as a result, the air current X and the air current Y respectively blown out from each of the main outlet passageways 12a, 12b, 12c, 12d and each of the auxiliary outlet passageways 12e, 12f, 12g toward the inside of the air conditioned room are short circuited, and sucked into the inlet 31.

However, in the air conditioner 1 of the present embodiment, by making the spacing between each of the auxiliary outlet passageways 12e, 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to that auxiliary outlet passageway 12e, 12f, 12g satisfy the prescribed relational expression explained below, it is possible to ensure passageways, between each of the auxiliary outlet passageways 12e, 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to that auxiliary outlet passageway 12e, 12f, 12g, for the air sucked into the inlet 31 from the outer circumferential side of the inlet 31.

The following explains the dimensional relationship between each of the auxiliary outlet passageways 12e, 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to that auxiliary outlet passageway 12e, 12f, 12g, taking as an example the dimensional relationship between the auxiliary outlet passageway 12e and the main outlet passageway 12a adjacent to that auxiliary outlet passageway 12e. Here, because the dimensional relationship between the auxiliary outlet passageway 12e and the main outlet passageway 12d adjacent to that auxiliary outlet passageway 12e is the same for the dimensional relationships between the other auxiliary outlet passageways 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d, the explanation thereof is omitted.

If we let D be the distance between point P (first proximate part), which is the most proximate part of the auxiliary outlet passageway 12e to the main outlet passageway 12a, and side Q (second proximate part), which is the most proximate part of the main outlet passageway 12a to the auxiliary outlet passageway 12e, L₁be the length of the main outlet passageway 12a in the direction along the outer circumferential edge of the side part 30a (i.e., the side plate 22a), W₁be the width of the main outlet passageway 12a in the direction orthogonal to the side plate 22a, and S₂be the opening area of the auxiliary outlet passageway 12e, then the dimensional relationship between the auxiliary outlet passageway 12e and the main outlet passageway 12a adjacent to that auxiliary outlet passageway 12e is:

D/(L₁W₁+S₂)^0.5>0.15.

Here, the opening area S₂of the auxiliary outlet passageway 12e is, in a plan view of the casing 2, the opening area of the portion where the opening area from the auxiliary outlet hole 72e to the auxiliary outlet 32e is smallest, and is equivalent to the opening area of the auxiliary outlet hole 72e in the present embodiment. Furthermore, if the shape of the auxiliary outlet hole 72e is substantially square shaped as in the present embodiment, then the opening area S₂is equivalent to the value of the sum of L₂, which is the length between the point P of the auxiliary outlet passageway 12e and the point P′, which is the most proximate part of the auxiliary outlet passageway 12e to the main outlet passageway 12d, and width W₂in the direction orthogonal to the line mutually linking the point P and the point P′ of the auxiliary outlet passageway 12e (≈L₂W₂).

Moreover, because the value of the sum of L₁, which is the length of the main outlet passageway 12a in the direction along the side plate 22a, and W₁, which is the width of the main outlet passageway 12a in the direction orthogonal to the side plate 22a (=L₁W₁), is equivalent to the opening area S₁of the main outlet passageway 12a, the abovementioned dimensional relationship prescribes the minimum spacing capable of ensuring passageways, between each of the auxiliary outlet passageways 12e, 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to that auxiliary outlet passageway 12e, 12f, 12g in accordance with the opening size of the main outlet passageways 12a, 12b, 12c, 12d and the auxiliary outlet passageways 12e, 12f, 12g, for the air sucked into the inlet 31 from the outer circumferential side of the inlet 31.

In addition, the opening area S₂of each of the auxiliary outlet passageways 12e, 12f, 12g is less than the opening area S₁of each of the main outlet passageways 12a, 12b, 12c, 12d.

Furthermore, the circumferential edge parts of the auxiliary outlet passageways 12e, 12f, 12g are formed so that the air current Y blown out from each of the auxiliary outlet passageways 12e, 12f, 12g is blown out in a direction away from the air current X blown out from each of the adjacent two main outlet passageways 12a, 12b, 12c, 12d. Taking the auxiliary outlet passageway 12e as an example, in the present embodiment, the auxiliary outlet passageway 12e is formed so that angles θ, θ′ formed between end surfaces 74, 75 on the main outlet passageways 12a, 12d side thereof and the sides Q, Q′ of the adjacent main outlet passageways 12a, 12d is a positive value (e.g., 45°, and the like).

(3) Operation of the Air Conditioner

The following explains the operation of the air conditioner 1, referencing FIG. 2, FIG. 4, FIG. 5, FIG. 6, and FIG. 8. Here, FIG. 8 is an enlarged view of FIG. 4, and depicts the vicinity of the auxiliary outlet 32e (a partial broken view of the panel lower surface part 3b).

When operation starts, the fan motor 41 is driven, which rotates the impeller 42 of the fan 4. In addition, along with the driving of the fan motor 41, refrigerant is supplied from the outdoor unit (not shown) to the inside of the heat exchanger 6. Here, the heat exchanger 6 functions as an evaporator during cooling operation, and as a condenser during heating operation. Further, attendant with the rotation of the impeller 42, the air inside the air conditioned room is sucked from the inlet 31 of the face panel 3 through the filter 34 and the bell mouth 5 into the casing main body 2a from the lower side of the fan 4. This sucked in air is blown out to the outer circumferential side by the impeller 42, reaches the heat exchanger 6, is cooled or heated in the heat exchanger 6, and then blown through the main outlet holes 72a, 72b, 72c, 72d and the main outlets 32a, 32b, 32c, 32d (i.e., the main outlet passageways 12a, 12b, 12c, 12d), and the auxiliary outlet holes 72e, 72f, 72g and the auxiliary outlets 32e, 32f, 32g (i.e., the auxiliary outlet passageways 12e, 12f, 12g) out into the air conditioned room. In so doing, the inside of the air conditioned room is cooled or heated.

Here, the auxiliary outlet passageways 12e, 12f, 12g are respectively disposed in the panel corner parts 30e, 30f, 30g with a spacing that satisfies the dimensional relationship formula explained above, in accordance with the opening sizes of the respective main outlet passageways 12a, 12b, 12c, 12d and auxiliary outlet passageways 12e, 12f, 12g. Thereby, it is possible to ensure passageways, between each of the auxiliary outlet passageways 12e, 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to that auxiliary outlet passageway 12e, 12f, 12g, for the air sucked into the inlet 31.

Taking the auxiliary outlet passageway 12e as an example, by setting the spacing between the auxiliary outlet passageway 12e and the adjacent main outlet passageway 12a to be the distance D, a passageway for the air sucked into the inlet 31 can be ensured and, consequently, an air current Z from the outer circumferential direction of the face panel 3 can be introduced into the inlet 31, thereby enabling a reduction in the short circuit. Furthermore, because the spacing between the auxiliary outlet passageway 12e and the main outlet passageway 12d adjacent to the auxiliary outlet passageway 12e can ensure a passageway for the air sucked into the inlet 31, the same as with the spacings between the other auxiliary outlet passageways 12f, 12g and the main outlet passageways 12a, 12b, 12c, 12d adjacent to those other auxiliary outlet passageways 12f, 12g, air from the outer circumferential direction of the face panel 3 can be introduced into the inlet 31, thereby reducing short circuits.

In addition, the wind direction of the air current X blown from each of the main outlets 32a, 32b, 32c, 32d out into the air conditioned room is regulated by the horizontal flaps 35a, 35b, 35c, 35d to within the wind direction regulation range (specifically, the range from the angle β₁to the angle β₂with respect to the lower surface of the ceiling U). However, the air current Y blown from each of the auxiliary outlets 32e, 32f, 32g out into the air conditioned room is blown out in the direction of the angle γ, which is the direction of substantially the middle of the wind direction regulation range of the horizontal flaps 35a, 35b, 35c, 35d with respect to the lower surface of the ceiling U.

However, taking the auxiliary outlet 32e as an example, the auxiliary outlet 32e is disposed at the panel corner part 30e adjoining the main outlet 32d and the main outlet 32a, and is consequently easily affected by the air current X blown out from the main outlet 32d and the main outlet 32a into the air conditioned room. Specifically, the air current Y blown out from the auxiliary outlet 32e is dragged by the air current X blown out from the adjoining main outlet 32d and main outlet 32a, and its direction tends to vary. Consequently, the oscillation by the horizontal flaps 35d, 35a provided at the main outlets 32d, 32a changes the direction of the air current Y blown out from the auxiliary outlet 32e so that it proceeds in a direction the same as the wind direction of this air current X.

Thereby, if the wind direction of the air current X blown out from each of the main outlets 32d, 32a is regulated to an angle less than the wind direction of the air current Y (i.e., the direction of the angle γ with respect to the lower surface of the ceiling U) blown out from the auxiliary outlet 32e, then the wind direction of the air current Y blown out from the auxiliary outlet 32e is dragged thereby, and becomes less than the angle γ. Conversely, if the wind direction of the air current X blown out from each of the main outlets 32d, 32a is regulated to an angle greater than the wind direction of the air current Y (i.e., the direction of the angle γ with respect to the lower surface of the ceiling U) blown out from the auxiliary outlet 32e, then the wind direction of the air current Y blown out from the auxiliary outlet 32e is dragged thereto, and becomes greater than the angle γ.

Thus, the wind direction of the air current Y blown out from the auxiliary outlet 32e can be varied even if blown out in a fixed direction, without providing a mechanism, such as the horizontal flaps, for varying in the vertical direction the wind direction of the air blown out from the auxiliary outlet 32e. Furthermore, the blow-out direction of the air current Y for each of the other auxiliary outlets 32f, 32g can also be varied in accordance with changes in the wind direction of the air current X blown out from each of the contiguous main outlets, without providing a mechanism, such as the horizontal flaps, the same as the auxiliary outlet 32e.

Incidentally, if the phenomenon occurs where the air current Y blown out from each of the auxiliary outlets 32e, 32f, 32g into the air conditioned room, as described above, is dragged by the air current X blown out from each of the main outlets 32a, 32b, 32c, 32d into the air conditioned room, then it would result in a situation where the inlet 31 is surrounded by the air currents X and the air currents Y, which tends to produce short circuits; however, even in such a situation, by disposing the auxiliary outlets 32e, 32f, 32g and the main outlets 32a, 32b, 32c, 32d with a spacing that satisfies the dimensional relationship formula explained above, passageways between each of the auxiliary outlets 32e, 32f, 32g and the main outlets 32a, 32b, 32c, 32d can be ensured for the air sucked into the inlet 31, thereby reducing short circuits.

In addition, because the opening area S₂of each of the auxiliary outlet passageways 12e, 12f, 12g is less than the opening area S₁of each of the main outlet passageways 12a, 12b, 12c, 12d and the flow speed of the air blown out from each of the main outlet passageways 12a, 12b, 12c, 12d does not drop significantly, the air current X blown out from each of the main outlet passageways 12a, 12b, 12c, 12d can be made to reach as far as possible. Moreover, because the flow speed of the air blown out from each of the auxiliary outlet passageways 12e, 12f, 12g is small and a difference is created in the reach between the air current Y blown out from each of the auxiliary outlet passageways 12e, 12f, 12g and the air current X blown out from each of the main outlet passageways 12a, 12b, 12c, 12d, it is possible to ensure a passageway, below the air current Y blown out from each of the auxiliary outlet passageways 12e, 12f, 12g, for the air sucked into the inlet 31.

Furthermore, because the circumferential edge parts (specifically, the end surfaces 74, 75) of the auxiliary outlet passageways 12e, 12f, 12g are formed so that the air current Y blown out from each of the auxiliary outlet passageways 12e, 12f, 12g is blown out in a direction away from the air current X blown out from each of the two adjacent main outlet passageways 12a, 12b, 12c, 12d, it is even easier to ensure a passageway for the air sucked into the inlet 31.

(4) Other Embodiments

The above explained an embodiment of the present invention based on the drawings, but the specific constitution is not limited to these embodiments, and it is understood that variations and modifications may be effected without departing from the spirit and scope of the invention.

(A)

In the abovementioned embodiment, although the auxiliary outlets 32e, 32f, 32g, 32h are formed so that they correspond to all of the panel corner parts 30e, 30f, 30g, 30h, an auxiliary outlet hole corresponding to the auxiliary outlet 32h is not provided in the drain pan 7; consequently, of the four auxiliary outlets 32e, 32f, 32g, 32h, only the three auxiliary outlets 32e, 32f, 32g function as substantial auxiliary outlets and the air inside the casing main body 2a may be blown out from the auxiliary outlet 32h into the air conditioned room by forming the auxiliary outlet hole 72h also at a position corresponding to the auxiliary outlet 32h of the drain pan 7, and by providing the auxiliary outlet passageway 12h, as shown in FIG. 9 (a schematic plan cross sectional view of the air conditioner according to another embodiment, and a view equivalent to FIG. 3). Thereby, the air can be blown from all four panel side parts 30a, 30b, 30c, 30d and all four panel corner parts 30e, 30f, 30g, 30h of the face panel 3 out into the air conditioned room, and the distribution of the air blown out into the air conditioned room can be made further satisfactory.

(B)

In the abovementioned embodiment, forming the circumferential edge parts (specifically, the end surfaces 74, 75) of each of the auxiliary outlet passageways 12e, 12f, 12g so that the air current Y blown out from each of the auxiliary outlet passageways 12e, 12f, 12g is blown out in a direction away from the air current X blown out from each of the two adjacent main outlet passageways 12a, 12b, 12c, 12d makes it easier to ensure passageways for the air sucked into the inlet 31; however, as shown in FIG. 10 (a drawing that depicts the vicinity of the auxiliary outlet passageway 12e corresponding to the auxiliary outlet 32e according to another embodiment, and equivalent to FIG. 7) and taking the auxiliary outlet passageway 12e as an example, it is also acceptable to provide a plurality (four in the present embodiment) of guide flaps 76 inside the auxiliary outlet passageway 12e that guides the air current Y blown out from the auxiliary outlet passageway 12e so that it is blown out in a direction away from the air current X blown out from each of the adjacent two main outlet passageways 12a, 12d.

(C)

In the abovementioned embodiment, the auxiliary outlet passageways 12e, 12f, 12g, 12h are formed so that they correspond to three or four of the four panel corner parts 30e, 30f, 30g, 30h; however, it is also acceptable to provide auxiliary outlet passageways in just one or two of the four panel corner parts 30e, 30f, 30g, 30h. Even in this case, by disposing the auxiliary outlet passageways in the panel corner parts with a spacing that satisfies the dimensional relationship formula explained above, it is possible to ensure passageways between adjacent main outlet passageways for the air sucked into the inlet 31, thereby reducing short circuits.

(D)

In the abovementioned embodiments, the present embodiment was applied to a ceiling embedded type air conditioner 1 having a substantially square shaped face panel 3, but is also applicable to a ceiling embedded type air conditioner 1 having a polygonal face panel having five or more sides.

INDUSTRIAL FIELD OF APPLICATION

Using the present invention enables, in a ceiling embedded type air conditioner wherein the outlets are disposed so that they surround the inlet, a reduction in short circuits without increasing drafts due to air currents blown out from the outlets.

Air conditioner

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CPC

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