Waste heat collecting apparatus
a technology of waste heat and heat collection equipment, which is applied in the direction of indirect heat exchangers, light and heating equipment, machines/engines, etc., can solve the problems of complex structure of heat exchangers and complex heat exchangers as a whole, and achieve the effect of simple structur
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first embodiment
[0044] A waste heat collecting apparatus. 100 according to a first embodiment of the present invention is applied to an automotive vehicle having an engine 10 for producing a driving power for the vehicle. The waste heat collecting apparatus 100 is provided in an exhaust pipe 11 and a waste heat collecting circuit 30. More detailed structure will be explained with reference to FIGS. 1 to 5, wherein FIG. 1 is a schematic view showing the waste heat collecting apparatus 100 installed in the vehicle, FIG. 2 is a cross sectional view of the waste heat collecting apparatus 100, FIG. 3 is a cross sectional view taken along a line III-III in FIG. 2, FIG. 4 is a cross sectional view showing a valve device 150 provided in the waste heat collecting apparatus in a valve opened condition, and FIG. 5 is a cross sectional view showing the valve device 150 in a valve closed condition.
[0045] As shown in FIG. 1, the engine 10 is a water cooled type internal combustion engine, and has the exhaust pi...
second embodiment
[0093]FIG. 9 shows a second embodiment of the invention. The valve device 150 of the second embodiment differs from that of the first embodiment in that a bypass aperture 152e (having a smaller opening than that of the aperture 152d) is provided at the valve seat 152c. According to such a modification, even when the aperture 152d is fully closed by the valve body 155, a small amount of the condensed water may return from the condensing portion 130 to the vaporizing portion 110 through the return pipe 161 via the bypass aperture 152e.
[0094] In the case that the engine 10 is operating at its high-load, but the radiator 21 has an additional coverage for the cooling operation, the waste heat collecting operation is carried out by the circulation of the working fluid through the bypass aperture 152e. The size of the bypass aperture 152e is decided depending on the additional coverage at the radiator 21, such that the overheat of the engine 10 can be avoided even when the certain amount ...
third embodiment
[0096]FIG. 10 shows a third embodiment of the invention. The valve device 150 of the first embodiment is replaced by a valve device 170 of a thermo-wax type, wherein the valve device 170 opens and closes the passage depending on the temperature of the engine coolant.
[0097] The valve device 170 is composed of a thermo-wax portion 171, a connecting rod 172, and a bellows 173. A wax is filled into the thermo-wax portion 171, which is expanded or contracted depending on the temperature of the coolant. One end (upper end) of the connecting rod 172 is connected with the thermo-wax portion 171, and the other end (lower end) thereof is connected to a lower end of the bellows 173. The connecting rod 172 is moved downwardly or upwardly depending on the expansion or contraction of the wax.
[0098] The lower end portion of the bellows 173 acts as a valve body for the valve device 170. The bellows 173 is made of a metal and extendable in a longitudinal direction. One end (upper end) of the bello...
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