JPS6233967B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an air mix type in which the temperature of the blown air is adjusted by adjusting the amount of cold air and warm air by rotating an air mix damper. Regarding automotive air conditioners, especially in the temperature control range of bi-level mode (simultaneous blowout mode of upper and lower air outlets), cold air is blown from the upper air outlet and warm air is blown from the lower air outlet, resulting in cold-head-chill-heat-type airflow. This invention relates to an air conditioner that provides air temperature distribution.

[Conventional technology]

Conventionally, in air mix type automotive air conditioners, in order to improve the mixing of cold and warm air,
An air mix chamber provided with a fixed throttle guide is provided in the cold/warm air mixing section, and an upper outlet and a lower outlet are connected to the air mix chamber.
The above-mentioned fixed throttle guide can mix the cold air and warm air flowing into the air mix chamber to form conditioned air with a uniform temperature. In mode (air blows only from the upper air outlet),
Conditioned air at a uniform temperature can be blown out from the upper outlet or the lower outlet, which is preferable.

[Problem that the invention seeks to solve]

However, with the above conventional device, even in the bilevel mode in which air is blown simultaneously from both the upper and lower outlets, the fixed aperture guide uniformly mixes cold air and warm air. There is a problem in that air having the same temperature as the air outlet is blown out, making it impossible to obtain a comfortable temperature distribution with cold heads and hot feet.

In view of the above-mentioned points, an object of the present invention is to provide an air conditioner for an automobile that has a simple structure and can obtain a comfortable temperature distribution with cold head and warm feet during bilevel mode.

[Means for solving problems]

In order to achieve the above object, the present invention includes: (a) a heater core that heats the blown air; (b) a cold air bypass passage that bypasses the heater core; and (c) adjusting the proportion of air flow to the heater core and the cold air bypass passage. (d) an air mix passage provided downstream of the heater core and the cold air bypass passage, which mixes warm air that has passed through the heater core and cold air that has passed through the cold air bypass passage; (e) the air mix passage. (f) a lower air outlet arranged so as to communicate with both sides of the air mix passage; (g) an upper air outlet arranged to communicate with the central portion of the width of the air mix damper; A technical means is adopted in which the air guide is provided on the side surface of the cold air bypass passage and guides the cold air toward the center of the width of the cold air bypass passage and the air mix passage.

[Effect]

According to the above technical means, in the bilevel mode, the cold air passing through the cold air bypass passage is guided toward the center of the cold air bypass passage and the air mix passage by the air guide provided in the air mix damper, and the air is guided to the center of the air mix passage. The main stream of cold air can be blown out from the communicating upper outlet. As a result, the temperature of the air blown from the upper outlet can be made lower than the temperature of the air blown from the lower outlet.
A comfortable outlet air temperature distribution with cold head and warm feet is achieved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In Figures 1 and 2, reference numeral 1 is a motor-driven blower fan, and its intake port has an inside/outside air switching box (not shown) that selectively introduces air outside the vehicle interior (outside air) and air inside the vehicle interior (inside air). are connected. An evaporator 2 of a refrigeration cycle is disposed on the discharge side of the blower fan 1, and further downstream thereof are a heater core 3 that heats the air to be blown using engine cooling water as a heat source, a cold air bypass passage 5 that bypasses the heater core 3, and a heater core 3. An air mix damper 4 is provided to adjust the air volume ratio of cool and warm air passing through the cold air bypass passage 5. An air mix passage 14 is provided downstream of the heater core 3 and the cold air bypass passage 5 to mix the warm air that has passed through the heater core 3 with the cold air that has passed through the cold air bypass passage 5. As shown,
The central part of the front, that is, the air mix passage 1
An upper air outlet 6 for ventilation and cooling is connected to the central portion of the width of the air mix passage 14, and a defroster air outlet 8 and a lower air outlet 10 for heating are connected to both left and right sides of the air mix passage 14. Each of these outlets 6, 8, and 10 is provided with a damper 7, 9, and 11, respectively, to open and close each outlet.

As is well known, the upper air outlet 6 is connected to a three-way branch duct (not shown) leading to an upper air outlet grill provided at the center of the instrument panel in the vehicle interior and at both ends thereof. It's summery.
The reason for adopting this arrangement is that the speed and temperature of the cold air blown out from the three upper blowing grilles via the three-way branch duct can be easily uniformized, and the cold air can be blown into the passenger compartment in a good manner. And furthermore, 3
This is because the branch duct can be easily mounted on a vehicle.

An air guide 12 is attached to the air mix damper 4 on the side facing the cold air bypass passage 5. As shown in detail in FIG. 3, the air guide 12 is made of a metal plate that is high at both ends and low at the center and is V-shaped when viewed from above, and includes a bracket 16 and screws integrally formed on the air guide 12. The air guide 12 is fixed to the air mix damper 4 by 17. Note that the air mix damper 4 and the air guide 12 may be integrally molded from resin. The air guide 12 serves to guide the cold air passing through the cold air bypass passage 5 toward the center of the width of the passage 5 and the air mix passage 14. Furthermore, in this example, first fixed throttle air guides 13 shown in FIG. 4 are provided on both sides of the cold air bypass passage 5,
The wind flowing out of the cold air bypass passage 5 is guided toward the center of the width of the air mix passage 14. The air guide 13 is molded integrally with a resin case 20 of the air conditioner. Further, a second fixed throttle air guide 15 is attached to the upper inner surface of the case 20 downstream of the heater core 3. As shown in FIG. 5, the air guide 15 is made of a metal plate that is high in the center and low at both ends, and is V-shaped when viewed from the top. Place the air guide 15 with the tip of the letter facing the heater core 3 side.
is fixed. The air guide 15 serves to guide the warm air that has passed through the heater core 3 to both sides of the air mix passage 14 and slightly downward. Note that this air guide 15 may also be made of resin and may be integrally molded with the case 20. The case 20 integrally houses both the evaporator 2 and the heater core 3.

Next, the operation of this embodiment in the above configuration will be explained. Air inside the vehicle or outside the vehicle is sucked by the blower fan 1 through the inside/outside air switching box and sent to the evaporator 2, and the blown air is cooled by the evaporator 2 and becomes cold air. A portion of this cold air passes through the heater core 3 and becomes warm air depending on the opening position of the air mix damper 4, and the remaining portion passes through the cold air bypass passage 5 as cold air. These warm air and cold air enter the air mix passage 14 and are blown out to each outlet 6, 8, 10 depending on the operating mode.

Assume that the air conditioner is now operating in a bilevel mode (simultaneous air blowing from the upper air outlet 6 and the lower air outlet 10). In this case, both the damper 7 of the upper outlet 6 and the damper 11 of the lower outlet 10 are in an open state. Of the cold air that has passed through the evaporator 2, the main flow of the cold air that passes through the cold air bypass passage 5 is directed to the air guide 12 on the air mix damper 4.
The air is guided towards the center of the width of the cold air bypass passage 5, and then towards the center of the width of the air mix passage 14. Here, in this example, when the cold air passes through the cold air bypass passage 5, the air guide 13 of the passage 5 also guides the cold air toward the center of the width of the air mix passage 14. On the other hand, the mainstream of the warm air that has passed through the heater core 3 flows through an air guide 1 provided on the inner surface of the upper part of the case 20 downstream of the heater core.
5 and is guided to both sides of the air mix passage 14 and slightly downward. In this way, both the cold air and the warm air are guided into the air mix passage 14, but since the main stream of the cold air passes through the center of the width of the air mix passage 14, and the main stream of the warm air passes through both sides, the two only mix slightly. The cold air is mainly sent to the upper outlet 6 located at the center of the width of the air mix passage 14, and the warm air is mainly sent to the lower outlet 10 located at both sides. Therefore, a moderate amount of cool air is blown into the vehicle interior from the upper blowing grilles at the center and both side ends of the instrument panel through the three-way branch duct connected to the upper blowing outlet 6 at a uniform wind speed and temperature. Appropriate warm air is blown from below, providing a comfortable temperature distribution with cold head and warm feet, and also provides good temperature control characteristics and temperature variation. At this time, the temperature difference between the wind from the upper air outlet and the wind from the lower air outlet 10 is determined by the temperature difference between each air guide 12,
It can be easily changed by changing the shape and height of 13 and 15. Of course, if the height of the air guide 15 is increased, the temperature difference will increase.

Next, when operating in the heater mode or vent mode, the damper 7 of the upper outlet 6 or the damper 11 of the lower outlet 10 are closed, so the air mix passage 14 is Even if the mainstream positions of the inflowing cold air and warm air are different, they are ultimately guided only to the lower outlet 10 or only to the upper outlet 6, so the cold air and warm air are evenly mixed in the middle of the passage. Air at a uniform temperature is blown out from each outlet 6 or 10.

In addition, in the above-mentioned embodiment, the case where the present invention was applied to an automobile air conditioner having the evaporator 2 was explained, but the present invention is not limited to this.
Of course, the present invention is also applicable to air conditioners that do not include the evaporator 2.

〔Effect of the invention〕

As described above, according to the present invention, even with an extremely simple configuration in which the air guide is integrally provided with the air mix damper, the main stream of cold air can be guided to the upper outlet through the center of the width of the air mix passage. This makes it possible to obtain a comfortable blowout temperature distribution in the form of cold head and warm feet during bilevel mode. In addition, since the upper air outlet 6 is connected to the upper air outlet grilles at the center and both ends of the instrument panel through the three-way branch duct, the cold air blows out from the three upper air outlet grilles. The wind speed and temperature of the vehicle tend to be uniform, and the cool air is blown into the vehicle interior in a good manner. Furthermore, it is easy to install such a three-way branch duct in a vehicle.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of an automotive air conditioner according to an embodiment of the present invention; FIG. 2 is a schematic explanatory diagram showing the relationship between the air mix passage, each outlet, and each air guide of the device in FIG. 1; FIG. 3 is a perspective view of the air mix damper 4, and FIG. 4 is a fixed throttle air guide 13.
FIG. 5 is a perspective view of the fixed throttle air guide 15. FIG. 1...Blower fan, 2...Evaporator, 3...
...Heater core, 4...Air mix damper, 5...
...Cold air bypass passage, 6...Upper outlet, 10...
...Lower air outlet, 12, 13, 15...Air guide, 14...Air mix passage, 20...Case.

Claims (1)

[Scope of Claims] 1 (a) a heater core that heats blown air; (b) a cold air bypass passage that bypasses the heater core; and (c) an air mix that adjusts the proportion of air flow to the heater core and the cold air bypass passage. a damper; (d) an air mix passage that is provided downstream of the heater core and the cold air bypass passage and mixes the warm air that has passed through the heater core with the cold air that has passed through the cold air bypass passage; and (e) the center of the width of the air mix passage. (f) a lower air outlet arranged so as to communicate with both sides of the air mix passage; (g) a cold air bypass passage side of the air mix damper. An air conditioner for an automobile, comprising: an air guide provided on a side surface of the air guide for guiding cold air toward the center of the width of the cold air bypass passage and the air mix passage. 2. The automobile air conditioner according to claim 1, wherein the cold air bypass passage is provided with an air guide that guides the cold air toward the center of the width of the cold air bypass passage and the air mix passage.