Air-conditioning apparatus

1. An air-conditioning apparatus comprising

walls that form an air passageway terminating in an air outlet blowing out air that has exchanged heat in a heat exchanger,

wherein the walls of the air outlet are defined by an inner air-passage wall and an outer air-passage wall extending in a longitudinal direction of the air passageway and by air outlet sidewalls in a short-side direction,

wherein each of the inner air-passage wall and the outer air-passage wall includes a plurality of recesses extending in the longitudinal direction of the air passageway, the recesses being provided at the right end and left end in the inner air-passage wall respectively and at the right end and left end in the outer air-passage wall respectively, the recesses each having a width in the longitudinal direction on a downstream side of the air passageway adjacent the air outlet smaller than a width in the longitudinal direction on an upstream side of the air passageway, and

wherein a depth of each recess in a middle portion between the upstream side and the downstream of the air passageway is deeper than a depth of each recess of the upstream side and the downstream side.

2. The air-conditioning apparatus of claim 1 , further comprising:

a recess sidewall provided to form a step between each of the end portions and the central portion of the inner air-passage wall or the outer air-passage wall, the inner air-passage wall and the outer air-passage wall forming the recesses in the end portions, the step corresponding to one of the recesses, wherein

the recess sidewall is at an angle of inclination θ with respect to a direction that is orthogonal to the longitudinal direction of the air outlet, and

a width, in the longitudinal direction, of each of the end portions of the walls is continuously reduced from the upstream side toward the downstream side of the air.

3. The air-conditioning apparatus of claim 1 , wherein edges of the end portions on the upstream side of the air incline with respect to an edge of the central portion corresponding to the end portions on the upstream side of the air.

4. The air-conditioning apparatus of claim 2 , wherein the angle of the inclination θ is 20° to 60°.

5. The air-conditioning apparatus of claim 1 , wherein

the walls include the inner air-passage wall having a concave curved surface and the outer air-passage wall having a convex curved surface, and

the inner air-passage wall and the outer air-passage wall have the recesses, and the recesses of the inner air-passage wall face the recesses of the outer air-passage wall.

6. The air-conditioning apparatus of claim 1 , wherein a blowing angle at each of the end portions having the respective recesses is smaller than that at the central portion of the inner air-passage wall, the blowing angle being formed by the inner air-passage wall having the recesses in the end portions from a horizontal direction at an end portion on the downstream side of the air.

7. The air-conditioning apparatus of claim 3 , wherein edges of the end portions of the walls on the upstream side of the air each incline in such a direction that a depth of the recess is reduced toward a terminal end thereof in the longitudinal direction of the air outlet.

8. An air-conditioning apparatus comprising:

an air outlet configured to blow heat-exchanged air from a heat exchanger out of the air-conditioning apparatus, the air outlet having walls comprising:

an inner air-passage wall extending in a longitudinal direction of the air outlet and including a central portion and opposing end portions;

an outer air-passage wall extending in the longitudinal direction and including a central portion and opposing end portions, the outer air-passage wall facing the inner air-passage wall;

each end portion of the inner air-passage wall and the outer air-passage including a recess;

air-outlet sidewalls extending in a short-side direction of the air outlet and together with the inner air-passage wall and the outer air-passage wall forming an air passage of the air outlet; and

a length of the air passage extending from and including an upstream side receiving the heat-exchanged air from the heat exchanger, past a middle portion and up to and including a downstream side discharging the heat-exchange air out of the air conditioner, wherein

the end portions of the inner and outer air-passage walls each have an upstream side, a downstream side and a middle portion corresponding to the upstream side, the downstream side and the middle portion of the air passage,

the central portions are wider than the end portions of the inner and outer air-passage walls,

the downstream side of each recess has a smaller width than the upstream side of each recess, and

the middle portion of each recess has a depth deeper than the upstream side and the downstream side of each recess.

9. The air-conditioning apparatus of claim 8 , wherein the air outlet further comprises:

a recess sidewall having a step arranged between the end portions and the central portion of the inner air-passage wall or the outer air-passage wall, wherein

the recess sidewall has an angle of inclination θ with respect to a direction that is orthogonal to the longitudinal direction of the air outlet, and

a width in the longitudinal direction of each of the end portions of the walls is continuously reduced from the upstream side toward the downstream side of the air passage.

10. The air-conditioning apparatus of claim 9 , wherein the angle of the inclination θ is 20° to 60°.

11. The air-conditioning apparatus of claim 8 , wherein

the inner air-passage wall has a concave curved surface and the outer air-passage wall has a convex curved surface, and

the inner air-passage wall and the outer air-passage wall have the recesses, and the recesses of the inner air-passage wall face the recesses of the outer air-passage wall.

12. The air-conditioning apparatus of claim 8 , wherein

a blowing angle is formed by the inner air-passage wall having the recesses in the end portions from a horizontal direction at an end portion on the downstream side of the air passage, and

the blowing angle at each of the end portions having the recesses is smaller than that at the central portion of the inner air-passage wall.

13. The air-conditioning apparatus of claim 8 ,

wherein the end portions on the upstream side of the air passage have edges that incline with respect to an edge of the central portion corresponding to the end portions on the upstream side of the air passage.

14. The air-conditioning apparatus of claim 13 , wherein

the edges each incline in a direction that reduces a depth of the recess toward a terminal end of the recess in the longitudinal direction of the air outlet.