JPS5939049Y2 - air switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air switching device that switches air from an air conditioner of an automobile to an outlet directed to the feet of a passenger and an opening connected to a defroster nozzle.

In this type of conventional air switching device, a rotatable damper is provided in the air passage of the blower, and is connected to the defroster nozzle during an operation mode in which air is blown out from the air outlet (for example, during a heating operation mode). In order to reduce the amount of air and send it to the opening, the damper was arranged and configured so that a gap was formed between the tip of the damper and the opposing wall of the ventilation passage, but if this gap was configured to be narrow, Since the sudden contraction of the blown air causes abnormal noise, it was necessary to make this gap as large as possible according to the design.

An object of the present invention is to provide an air switching device that eliminates the drawbacks of the conventional air switching device and can satisfactorily reduce the amount of air blown to the opening without producing abnormal noise. do.

In order to achieve this objective, the present invention is characterized in that an air restricting member is provided on the upstream side of the tip of the damper to cooperate with the opposing wall of the ventilation passage to restrict the airflow.

With this feature, the air from the blower is first throttled by the air restricting member before the damper tip and then passed through the gap between the damper tip and the opposing wall of the air passage, which prevents sudden contractions of the air. Even if the gap is configured to be narrower than that of a conventional air switching device, it is now possible to successfully reduce the air volume without generating abnormal noise.

The invention will now be described with reference to the accompanying drawings, which illustrate embodiments of the invention.

In the drawings, reference numeral 1 denotes a heater core, and hot water from an engine (not shown) is passed through the heater core with its flow rate adjusted by a flow rate regulating valve (not shown), and then returned to the engine.

A blower 2 is driven by an electric motor 3.

In this embodiment, a sirocco fan is used as the blower.

A damper 5 is arranged in the air passage 4 of the blower so as to rotate about a shaft 5a, and one end of the shaft 5a is connected to a control panel (not shown) in the vehicle interior via a suitable connection device. This control panel is configured to switch the damper 5 from the heating position shown by a solid line in the drawing to the defroster position shown by a two-dot chain line.

An extension 5b is provided at the tip of the damper 5, and an air throttle member 5c is provided protruding upstream from the extension 5b at the tip of the damper with respect to the air blown from the blower 2.

68 is a fixed guide member forming a part of the wall of the ventilation passage 4;
A gap 7 is formed between the extension part 5b and the extension part 5b at the tip of the damper in the heating position, which projects along the rotation locus, so that the air blown from the sirocco fan 2 is smoothly guided to the gap 7. ing.

8 is an opening for connecting to a defroster nozzle (not shown), 9 is an air outlet for the driver's feet, 10 is an air outlet for the front passenger's feet, and 11 is an air outlet duct installed in the rear seat. However, this drawing shows the person with the blind lids closed.

Reference numeral 12 denotes an air introduction port to which an inside/outside air switching duct (not shown) is attached.

The conventional air switching device of this type of heating device has a structure in which the damper 5, which is not provided with the illustrated extension portion 5b and the air restricting member 5c, is directly opposed to the wall of the ventilation passage in its heating position. Therefore, since there is no extension part 5b, the gap 7 becomes relatively large, and if the damper 5 is placed in the heating position and used for a long time, the large amount of air from the defroster nozzle causes the occupant's face to become hot.

These defects can be prevented by narrowing the gap 7, but as mentioned earlier, in the conventional configuration, if the gap 7 is narrowed, the airflow is suddenly narrowed in this gap, which causes an abnormal noise. Therefore, in order to avoid this, it was necessary to design the gap 7 to be as large as possible.

Next, to explain the operation of this embodiment, the tip extension portion 5b
When the blower, that is, the sirocco fan 2 is driven by the electric motor 3 with the duct 5 having the air restricting member 5c placed in the heating position shown by the solid line in the drawing, the air intake/port 1
The warm air passed through the heater core from No. 2 and sucked into the sirocco fan is discharged into the air passage 4, from which approximately 70% of the hot air flows through air outlets No. 9 and No. 10, from the sirocco to the passenger's feet. The remaining approximately 30% passes through the gap 7, passes through the opening 8, and is blown out from the differential and Rosta nozzles toward the window glass.

In this embodiment, the hot water to the heater core 1 is adjusted by the flow rate adjustment valve described above.
．． Although the temperature of the warm air blown from 10 to the feet of the passenger is the same as the temperature of the warm air from the defroster nozzle, since the duct tip extension 5b is provided, the gap 7 can be set sufficiently narrow, and the heating system Even if you use the defroster for a long time, the air volume from the defroster nozzle is small, so the occupants' faces will not get hot.

Furthermore, since the air restricting member 5c is provided on the damper 5, the hot air from the sirocco fan 2 is distributed between the air restricting member 5c and the fixed guide member 6 (a part of the wall of the ventilation passage) on the upstream side of the tip extension portion 5b of the damper. It has been confirmed through experiments that the generation of abnormal noise due to rapid contraction of flow in the gap 7 can be prevented because the constriction is performed in advance by the constriction action in cooperation with the gap 7.

The fixed guide member 6 having the above-described shape serves to further assist the action of the air restricting member 5c and to smoothly constrict the heated air.

Also, when the damper 5 is switched to the defroster position shown by the two-dot chain line in the drawing, the air volume on the driver's seat side increases and the air volume on the passenger seat side increases, whereas with the conventional damper 5 only, the air volume on the passenger seat side was small.
By providing the tip extension portion 5b and the air restricting member 5c, the amount of air flowing toward the driver's seat side is suppressed, and the air outlets 9 and 1
The effect of equalizing the amount of air blown from zero was also achieved.

In this embodiment, the damper 5 is made of an iron plate, and the extension portion 5b is integrated with the damper 5.

The air restricting member 5c is manufactured as a separate part and fixed to the damper 5 by spot welding.

The ends of the extension part 5b and the air restricting member 5c are made of a suitable material 1. in order to eliminate the edge portion and prevent the generation of abnormal noise due to separation of the blast air. For example, polyester foam can be pasted to give it a rounded shape.

In this embodiment, the air restricting member is made as a separate part, but it is also possible to integrate it.

In addition, although an iron plate was used as the material for the damper, the damper could also be molded from a resin material, such as ABS or polypropylene material.
In this case, the structure can be further simplified by making the tip end rounded and having an integral bottom shape.

In short, the present invention has an extremely simple configuration in which an air throttling member is provided on the upstream side of the tip of the damper of the air switching device, which throttles the air, and eliminates the shortcomings of conventional air switching devices of this type. In order to prevent the generation of noise, we were able to solve the problem of having to design the gap between the tip of the damper and the opposite wall of the ventilation passage to be as wide as possible.

In other words, by the action of the air restricting member, the air is throttled in advance on the upstream side of the damper tip, thereby preventing rapid contraction of the air in the gap, suppressing the generation of abnormal noise, and setting the gap to a desired narrowness. The air volume can be reduced satisfactorily, and the practical effect is extremely large.

[Brief explanation of the drawing]

The accompanying drawings are schematic diagrams showing an embodiment in which the air switching device of the present invention is applied to a heating device for an automobile. 2...Blower, 4...Blower passage, 5...
...Damper, 5b...Tip, 5c...
...Air restriction member.

Claims (1)

[Scope of utility model registration request] The air outlet 9, 10 is rotatably provided in the air passage 4 in order to switch the air from the air conditioner of the automobile to the air outlet 9, 10 to the passenger's feet and the opening 8 connected to the defroster nozzle. In order to reduce the amount of air and send it to the opening 8 during the operation mode in which air is blown from the tip 5b.
In an air switching device having a damper 5 which forms a gap 7 between the damper 5 and the opposing wall 6 of the ventilation passage, the damper 5 cooperates with the opposing wall of the ventilation passage on the upstream side of the tip 5b of the damper to An air switching device characterized by being provided with an air restricting member 5c that restricts the flow.