Ring fan and shroud air guide system
a technology of air guide system and ring fan, which is applied in the direction of liquid fuel engine, vessel construction, marine propulsion, etc., can solve the problems of reducing the efficiency of the fan, undesirable noise generation, and unsatisfactory back flow, so as to prevent the tip stall, improve efficiency, and minimize the leakage of the tip gap
Active Publication Date: 2016-06-23
BORGWARNER INC
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AI Technical Summary
Benefits of technology
The present invention relates to a ring fan and shroud assembly that reduces tip gap leakage flow and prevents tip stall, resulting in improved efficiency and reduced noise generation. The assembly includes a plurality of impeller blades positioned within and attached to a conical outer ring, a portion of the stationary shroud member, and a plurality of curved guide vanes provided in the shroud member that act on the back flow of air entering the tip gap. The curved guide vanes minimize or eliminate the tangential velocity component of the back flow air stream prior to reinducing that leakage flow back into the air stream through the recirculation nozzle. Additionally, the tip-gap has an entrance area substantially larger than the area of the recirculation nozzle, which increases the velocity of the air flow injection of the leakage flow back into the fan's air stream. The invention provides a simple solution for forming the shroud and guide vanes in a conventional two-piece mold injection molding process.
Problems solved by technology
The pressure differential between these two sides causes the fluid to flow from the high-pressure discharge side to the low-pressure intake side near the tips of the impeller blades creating an undesirable back flow of some of the fluid flow passing through the fan.
It is well-known that this backflow can decrease the efficiency of the fan and may lead to undesirable noise generation.
This can cause the tip region to stall and the resulting low relative-momentum flow can “hang up” in the region of the blade tips and fan ring.
This reduces the air flow rate of the fan, as well as its static pressure, and also increases the drag.
Method used
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Embodiment Construction
[0022]FIG. 1 illustrates a ring fan and shroud guide system 10 in accordance with the present invention. Although it is contemplated that the ring fan and shroud guide assembly 10 can be used in a variety of applications, the system 10 in one preferred embodiment is intended for use in a cooling system for an engine 11. Specifically, the preferred embodiment of the present invention is intended for use in conjunction with a radiator cooling system in a truck or large vehicle. It is to be understood, however, that the present invention can be used in many applications, and the invention is not to be limited only to trucks or other vehicles.
[0023]The fan member 15 has a central hub member 13 and a plurality of blade members 12 (also called “impeller” members). A circumferential ring member 14 is positioned at and connected to the ends (or tips) of the blade members. The use of impeller blades and a rotating ring element to form a fan assembly is well known in the art, and these fan as...
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A ring fan and shroud guide system which includes a rotating fan member with a conical outer ring and a cylindrical shroud member overlapping at least a portion of the outer ring. A plurality of guide vanes are provided in the shroud which minimize the tangential velocity component of the air flow entering the tip-gap region and provide improved air flow through the system. The guide vanes can have a curved configuration.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is continuation of U.S. application Ser. No. 12 / 594,017, filed Sep. 30, 2009.TECHNICAL FIELD[0002]The present invention relates generally to a ring fan and shroud assembly and more particularly to a ring fan and shroud assembly with improved air flow characteristics.BACKGROUND OF THE INVENTION[0003]Axial type fans move air, or other fluids, using rotating impeller blades. As the impeller blades rotate, different pressures on opposite sides of the blades are developed. The discharge sides of the impeller blades typically develop a high pressure while the intake sides develop a low pressure. The pressure differential between these two sides causes the fluid to flow from the high-pressure discharge side to the low-pressure intake side near the tips of the impeller blades creating an undesirable back flow of some of the fluid flow passing through the fan. It is well-known that this backflow can decrease the efficiency of the fan and may ...
Claims
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IPC IPC(8): F04D29/32
CPCF04D17/06F04D29/326F04D29/162F04D29/164
Inventor STAGG, JONATHAN B.BAILEY, JAMES W.
Owner BORGWARNER INC