Vehicular air conditioner

1. A vehicular air conditioner comprising:

an air-conditioning case that has an upper passage and a lower passage which are partitioned by an upper and lower partition plate therebetween;

a heating unit that is disposed over the upper passage and the lower passage;

an upper passage partition plate that is disposed downstream of the heating unit of the upper passage and forms a guide passage that guides a portion of air, which has passed the heating unit, toward an upper and lower connection opening that connects the upper passage and the lower passage; and

a guide passage opening/closing unit that closes the guide passage in a state where the upper and lower connection opening is closed,

wherein the guide passage opening/closing comprises a first sealing part and a second sealing part connected to an end of the first sealing part.

2. The vehicular air conditioner according to claim 1 ,

wherein the

first sealing part allows the upper and lower connection opening to be opened and closed, and

the second sealing part allows an outlet opening of the guide passage to be opened and closed, and closes the outlet opening in a state where the first sealing part closes the upper and lower connection opening.

3. The vehicular air conditioner according to claim 1 ,

wherein the upper passage partition plate extends toward the upper and lower connection opening at an outlet end of the guide passage.

4. The vehicular air conditioner according to any one of claim 1 ,

wherein a gap opening is provided between the heating unit, and an upstream end of the upper passage partition plate.

5. The vehicular air conditioner according to claim 1 ,

wherein the upper passage partition plate has a through opening that connects the guide passage and a space above the upper passage partition plate between an upstream end and a downstream end of the upper passage partition plate.

6. A vehicular air conditioner comprising:

an air-conditioning case that has an upper passage and a lower passage which are partitioned by an upper and lower partition plate therebetween;

a heating unit that is disposed over the upper passage and the lower passage;

an upper passage partition plate that is disposed downstream of the heating unit of the upper passage and forms a guide passage that guides a portion of air, which has passed the heating unit, toward an upper and lower connection opening that connects the upper passage and the lower passage; and

a guide passage opening/closing unit,

wherein a recirculation opening that allows air which is discharged from an outlet opening of the guide passage to be recirculated to a space above the upper passage partition plate is provided inside the air-conditioning case, and

wherein the guide passage opening/closing unit has

a first sealing part that allows the upper and lower connection opening to be opened and closed,

a third sealing part that is attached to the first sealing part with a space therebetween, and

a connecting part that connects the first sealing part and the third sealing part, and

wherein in a state where the first sealing part abuts on the upper and lower partition plate, the third sealing part abuts on the upper passage partition plate to stop a flow of the air through the recirculation opening.

7. The vehicular air conditioner according to claim 6 ,

wherein a foot opening, which communicates with the lower passage and discharges the air to be supplied to passenger's feet is provided in the air-conditioning case, and

wherein the guide passage opening/closing unit has a fourth sealing part that allows the foot opening to be opened and closed.

8. The vehicular air conditioner according to claim 7 ,

wherein the fourth sealing part opens the foot opening in a state where the upper and lower connection opening is closed, and closes the foot opening in a state where the upper and lower connection opening is opened.