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US 7,464,749 B2Granted
Air-conditioning unit
AssigneeDenso Corporation
InventorsYoshihiko Okumura, Takahiro Tokunaga
Life of this patent
Estimating the term…
Abstract
The air-conditioning unit includes an air-conditioning case, a heater, a bypass path bypassing the heater, an air-mixing chamber, an air-mixing door, and an air opening. The air-conditioning unit also includes an auxiliary door arranged in series with the air-mixing door in the bypass path. The auxiliary door is operated between at a first position and at a second position. The auxiliary door in the first position closes the bypass path more than in the second position. The auxiliary door is operated at the first position at least when the air-mixing door opens the bypass path slightly.
Claims23
An air-conditioning unit comprising:
- an air-conditioning case forming an air path therein;
- a heater for heating air passing therethrough, the heater being disposed in the air-conditioning case;
- a bypass path bypassing the heater;
- an air-mixing chamber in which cool air flowing through the bypass path and hot air passed through the heater are mixed;
- an air-mixing door disposed in the air-conditioning case to adjust an air-flow ratio between an air amount passing through the heater and an air amount passing through the bypass path;
- at least one air opening disposed in the air-conditioning case at an air downstream side of the air-mixing chamber;
- an auxiliary door arranged in series with the air-mixing door in the bypass path;
- the auxiliary door being operated between a first position and a second position, the auxiliary door in the first position closing the bypass path more than in the second position;
- the air-mixing door is operated between a maximum cooling position in which the air-mixing door fully opens the bypass path and fully closes the heater, and a maximum heating position in which the air-mixing door fully closes the bypass path and fully opens the heater;
- the auxiliary door is operated at the first position as the air-mixing door opens the bypass oath from the maximum heating position;
- the auxiliary door is operated at the first position when the air-mixing door is operated at the maximum heating position;
- the auxiliary door is operated at the second position when the air-mixing door is operated at the maximum cooling position;
- dimensions of the auxiliary door are smaller than dimensions of the bypass path;
- the auxiliary door overlaps with only a part of the bypass path;
- and
- the auxiliary door is disposed in the air-conditioning case where the air-mixing door begins to open the bypass path.
13 more elements
An air-conditioning unit, comprising:
- an air-mixing control device controlling an amount of air bypassing a heater through a bypass passage;
- and
- an air-resistance device selectively providing resistance to the controlled amount of the air bypassing the heater through the bypass passage;
- wherein
- the air-mixing control device includes a first rotatable plate and the air-resistance device includes a second rotatable plate, and an area of the second rotatable plate is less than an area of the first rotatable plate;
- the bypass passage is a generally rectangular passage having a height and a width;
- the second rotatable plate is a generally rectangular plate having a height analogous to the height of the bypass passage and a width analogous to the width of the bypass passage;
- the height of the second rotatable plate being substantially less than the height of the bypass passage;
- and
- the width of the second rotatable plate being substantially less than the width of the bypass passage.
7 more elements
An air-conditioning unit comprising:
- an air-conditioning case forming an air path therein;
- a heater for heating air passing therethrough, the heater being disposed in the air-conditioning case;
- a bypass path bypassing the heater;
- an air-mixing chamber in which cool air flowing through the bypass path and hot air passed through the heater are mixed;
- an air-mixing door disposed in the air-conditioning case to adjust an air-flow ratio between an air amount passing through the heater and an air amount passing through the bypass path;
- at least one air opening disposed in the air-conditioning case at an air downstream side of the air-mixing chamber;
- an auxiliary door arranged in series with the air-mixing door in the bypass path;
- the auxiliary door being operated between a first position and a second position, the auxiliary door in the first position closing the bypass path more than in the second position, the auxiliary door not prohibiting air flow between the heater to the at least one air opening in both the first and second position of the auxiliary door;
- and
- the auxiliary door being operated at the first position at least as the air-mixing door opens the bypass path.
7 more elements
Dependencies are inferred from the claim text.