An air outlet for motor-vehicle air-conditioning systems

Abstract: A ventilation outlet for use in a motor-vehicle dashboard has a cylindrical distributor (14) with an outlet slot (B) facing an outlet hole (16) in the dashboard. A duct (12b) with converging walls (15) is interposed between the outlet slot (B) in the rotatable distributor (14) and the outlet hole (16) to direct the air-flow in a predetermined direction according to the position of the distributor (14), without the use of deflecting vanes.

Description: The present invention relates to an air outlet, particularly for motor vehicle air-conditioning systems. Air outlets, commonly known as "vents", often present problems as regards their stylistic compatibility with the design of the dashboard in that it is difficult to integrate them with its lines and surfaces. Moreover, the small maximum angles of deflection of the air-flow in a vertical plane often causes problems for the passengers who are struck more or less directly by the jet of air. It is known form US-A-3 699 872 an air outlet including a cylindrical distributor rotatable in a hollow support body and having lateral outlet apertures, square-shaped, and a duct located beside the distributor and having walls which converge substantially towards its outlet hole, the position of the outlet apertures being variable relative to the position of the outlet hole, so that the air-flow from the hole is oriented in a predetermined direction. It is known from DE-A-2 933 083 an air distributor apparatus provided with a lateral opening for the air outlet. According to the present invention, this object is achieved by virtue of an air outlet having the characteristics cited specifically in the claims which follow. The object of the present invention is to provide an air outlet of the type specified at the beginning of the description which resolves the aforesaid problems simply and cheaply. According to the invention, this object is achieved by virtue of an air outlet having the characteristics recited in claim 1 which follows. By virtue of these characteristics, the deflection of the air in the air outlet of the invention is due to a dynamic flow effect, the flow being directed towards one of the converging walls of the duct by the lateral aperture in the distributor element so that deflection vanes are not needed. The air outlet of the invention is particularly adapted to deflect the air-flow in a vertical plane, whilst any deflection in a horizontal plane can be achieved by conventional orientable vanes. This fluid-dynamic deflection enables the outlet hole to be constituted by a narrow slot which can easily be integrated with the design of the dashboard and, moreover, can be used as an aesthetic motif thereof. A further advantage of the device according to the invention lies in the fact that the flow can be deflected from its normal outflow direction through large maximum angles of nearly 90°. Further advantages and characteristics of the device according to the invention will become clear from the detailed description which follows, provided purely by way of non-limiting example, with reference to the appended drawings, in which: Figure 1 is a schematic cross-sectional view of an air outlet according to the invention, Figures 2-4 are similar to Figure 1 and show three different configurations of the air outlet for the partial deflection of the air-flow, for its maximum deflection, and for shutting it off, respectively, Figure 5 is a view similar to Figure 1, showing a variant of the air outlet, Figure 6 shows a further variant of the air outlet in which the duct with converging walls is formed in the support body of the air outlet, Figure 7 shows a variant in which the duct with converging walls is formed in the dashboard of a motor vehicle, Figure 8 is a plan view of another embodiment of the outlet which has a plurality of orientable vanes for deflecting the air-flow in a direction other than that in which it is deflected by the rotation of the distributor, and Figure 9 is a section taken on the line IX-IX of Figure 8. With reference to the drawings, an air outlet, generally indicated 10, is constituted by a hollow body 12 containing a rotatable cylindrical distributor 14 with lateral wall portions 14a defining an inlet aperture A and an outlet aperture B for the air. The hollow support body 12 has an inlet duct 12a (which, in the configuration illustrated in Figure 1, is in communication with the inlet aperture A of the cylindrical distributor 14) and an outlet duct 12b with converging curved walls 15 defining a cavity which faces substantially towards the distributor 14. The walls 15 converge towards an outlet hole 16 which is adapted to be flush with the dashboard of the motor vehicle and whose shape and dimensions correspond substantially to those of the outlet aperture B in the distributor 14. Figure 2 relates to an intermediate configuration for the partial deflection of the air-flow in a vertical plane and shows the operating principle of the air outlet of the invention, in which an upward rotation (with reference to the drawings) of the outlet aperture B corresponds to a downward deflection of the air-flow which flows out in the direction indicated by the line D in Figure 2. This line is the result of the vectorial composition of the line E representing the horizontal outflow and the line F representing the outflow substantially tangential to one of the curved converging surfaces 15 near the hole 16. The continued rotation of the cylindrical distributor 14 in the sense indicated in the drawings achieves the maximum deflection of the flow in the vertical plane, as shown in Figure 3. A further rotation of the cylindrical distributor 14 (Figure 4) completely shuts off the air-flow to the outlet hole 16. The variant shown in Figure 5 differs only in the shape of the duct 12b which has flat converging walls 17. In the manufacture of the air outlet, in practice, the hollow support body 12 may also include the duct 12b with converging walls, as shown in Figure 6. Alternatively, the body 12 of the air outlet may be fitted (Figure 7) to a motor-vehicle dashboard P which defines both the duct 12b with its converging walls 17 and the outlet hole 16 which, in the embodiment shown in Figure 7, is in the form of a rectangular slot. In the embodiment shown in Figures 8-9, the duct 12b with converging walls has a plurality of parallel orientable vanes 22 with articulation pins 22a supported for rotation by the walls of the duct. In this embodiment, the air-flow can thus be deflected sideways as well as in a vertical plane. Any system currently in use may be used to rotate the cylindrical distributor 14. Figures 8-9 show, by way of example, an embodiment of an operating device including a ring 24 which projects partially from the dashboard and drives a wheel 26 keyed to the cylindrical distributor 14. Naturally, it is intended that, the principle of the invention remaining the same, the details of construction and forms of embodiment may be varied widely with respect to those described and illustrated in the drawings, without thereby departing from the scope of the present invention as described by the claims.

Claims: An air outlet, particularly for motor-vehicle air-conditioning system, including a cylindrical distributor (14) rotatable in a hollow support body (12) and presenting a lateral outlet aperture (B), the hollow support body (12) having an inlet duct (12a) and an outlet duct (12b), the outlet duct (12b) being located beside the cylindrical distributor (14) and having walls (15, 17) which converge substantially towards its outlet hole (16), the position of the outlet aperture (B) being variable relative to the position of the outlet hole (16) so that the air flow from the hole (16) is oriented in a predetermined direction, characterised in that the cylindrical distributor (14) presents a lateral inlet aperture (A) opposite to the lateral outlet aperture (B), the flow of the air from the inlet duct (12a) towards the outlet duct (12b) passes through the cylindrical distributor (14) substantially radially and in that the converging walls (15) of the outlet duct (12b) are curved and define a cavity facing the cylindrical distributor (14). An air outlet according to Claim 1, characterised in that the dimensions of the outlet aperture (B) in the distributor (14) correspond substantially to those of the outlet hole (16). An air outlet according to Claim 2, characterised in that the converging walls (17) of the duct are substantially flat. An air outlet according to any one of the preceding claims, characterised in that a plurality of parallel orientable vanes (22) are provided in the outlet hole (16) for further deflecting the air-flow. An air outlet according to any one of the preceding claims, characterised in that the duct (12b) is integral with the hollow support body (12) of the air outlet. An air outlet according to any one of Claims 1-5, characterised in that the duct (12b) is formed in the dashboard (P) of the motor vehicle, to which the hollow support body (12) of the air outlet is fitted.

Inventors: PIRITORE GIUSEPPE, TARZIA ANTONIO, PIRITORE, GIUSEPPE, TARZIA, ANTONIO
Applicants: FIAT AUTO SPA, FIAT AUTO S.P.A.
Application year: 1991
Main classification: B60H1
IPC codes: F24F13, B60H1