1. Field of the Invention
The present invention relates to an internal cooling passage structure for rotary engine, and more particularly, to a rotary engine, which has a device that increases the cooling air into the inner passage in the rotor core, and lower down the temperature of the rotor core and rotor assemblies during the operation by a guide vane.
2. Description of the Related Art
The engine cooling system of a piston engine or a rotary engine can be categorized into two types based on the heat load. They are air-cooling system and liquid-cooling system (water-cooling or oil-cooling).
As shown, there is a plurality of heat fins 11 mounting on edges of the rotor engine for exhausting the temperature generated by the rotor engine operated, and one side of the rotor engine has a cooling channel 12, which is used to increase the inner cooling air of the rotor engine. Additionally, the inner temperature of the rotor engine is exhausted by the cooling channel 12. However, there is a plurality of reinforcing ribs 13 mounting on the cooling channel 12. Thereby, the cooling air is barred to flow into the inner of rotor engine due to the reinforcing ribs 13 when flowing into the cooling channel 12 of the conventional rotor engine. Or the design way of cooling channel 12 allows the cooling air to generate the heat vortex phenomenon in the inner of the cooling channel 12, resulting in the external cooling air can not enter into the inner of the rotor engine and the temperature can not be exhausted from the inner of the rotor engine.
For the reason that the conventional method and device could not effectively solve the mentioned problems, a need has arisen to propose an internal cooling passage design for the rotary engine with a proper guide vane to diminish the vortices at the rotor core cooling openings in the front frame or rear frame and therefore more air is inducted into rotor core passages for a better cooling.
In view of the disadvantages of conventional techniques described above, the main object of the present invention is to provide a device in the internal cooling passage of the rotary engine, which uses a guide vane to increase cooling air into the rotor core cooling passage so as to lower the temperature in the rotor core and its assemblies during the engine operation. The guide vane is alternative in scale or shape on the basis of the engine requirements.
Another object of the present invention is to enhance the rotor core cooling efficiency so as to improve the engine efficiency and the life cycle under a better heat dissipation.
For achieving the object above, an internal cooling passage structure for rotary engine is disclosed according to one embodiment of the present invention. The internal cooling passage structure for rotary engine comprises: a rotary engine with a front frame, a mid-frame, a rear frame, a rotor and a guide vane. For the engine core cooling, there are dual rotor core cooling passage inlets on the front frame in correspondent to the dual core cooling passage exits on the rear frame. Three rotor core passages are beneath the three apexes of the triangular rotor. A guide vane in the front frame diminishes the vortices generated at the core cooling passage inlets to reduce the blockage and increase the cooling air mass so as to lower the rotor temperature for a stable engine operation.
The invention, as well as its many advantages, may be further understood by the following detailed description and drawings in which:
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Preferably, the guide vane 212 is designed according to the rotary engine category. Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.