Heat exchange – With timer – programmer – time delay – or condition responsive... – Temperature responsive or control
Reexamination Certificate
2000-02-25
2001-12-18
Lazarus, Ira S. (Department: 3743)
Heat exchange
With timer, programmer, time delay, or condition responsive...
Temperature responsive or control
C165S103000, C165S051000, C237S01230A, C237S01230B
Reexamination Certificate
active
06330910
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a heat exchanger for motor vehicle exhaust
BACKGROUND OF THE INVENTION
In Canadian Patent Application No. 2,185,076 (U.S. Pat. No. 5,799,632) Easton Bennett disclosed a novel heat exchanger configuration for a motor vehicle exhaust. This heat exchanger had an exhaust pipe with a flow passage formed of a coil of tubing. The exchange medium flows through the coil as hot exhaust gases flow through the flow passage in the centre of the coil.
In Canadian Patent Application No. 2,247,759 (U.S. patent application Ser. No. 09/158,711) Easton Bennett disclosed an improvement to the novel heat exchanger configuration. This heat exchanger had the coil of tubing with the central flow passage positioned in a larger housing, thereby forming an annular flow down the outside of the coil of tubing, in addition to the central flow passage. This configuration proved to be even more efficient for heat transfer.
In some applications, however, there is a concern that the coolant used as exchange medium will become over heated.
SUMMARY OF THE INVENTION
What is required is an alternative configuration of heat exchanger for a motor vehicle exhaust.
According to the present invention there is provided a heat exchanger for a motor vehicle exhaust which includes a tubular body having a first end, a second end, a peripheral sidewall, and at least two flow passages that extend between the first end and the second end. The at least two flow passages include at least one heat exchange fluid flow passage and at least one bypass fluid flow passage. A heat exchange coil is positioned in the at least one heat exchange fluid flow passage. The heat exchange coil has an inlet and an outlet extending through the sidewall of the tubular body. A valve is provided for selecting between the at least one heat exchange fluid flow passage and the at least one bypass fluid flow passage.
The heat exchanger, as described above, has a normal operating mode in which all exhaust gases are diverted through the heat exchange fluid flow passage to effect a heat exchange with fluid flowing through the heat exchange coil. However, when such a heat exchange is not desired, the valve is repositioned to divert all exhaust gases through the bypass fluid flow passage. It is also possible to put the valve in an intermediate position to have only a portion of the exhaust gases flow through the heat exchanger flow passage, as will hereinafter be further described.
REFERENCES:
patent: 2063436 (1936-12-01), Hild
patent: 2076287 (1937-04-01), Arnold
patent: 2486429 (1949-11-01), Monnet
patent: 2529915 (1950-11-01), Chausson
patent: 6151891 (2000-11-01), Bennett
patent: 2185076 (1998-03-01), None
patent: 2247759 (2000-03-01), None
Christensen O'Connor Johnson & Kindness PLLC
Ciric Ljiljana V.
Lazarus Ira S.
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