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US 4,055,151 AGranted
Waste heat boiler
AssigneeClarke Chapman Limited
InventorRobert James Cummings
Life of this patent
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AssigneeClarke Chapman Limited
InventorRobert James Cummings
Estimating the term…
The invention is a valve especially a divertor valve for diverting hot gas to a boiler or to a duct by-passing the boiler and for controlling the amount of gas flowing through the boiler. The valve enables changeover from one flow path to another by rotary movement. The valve member is of plate construction having scraping action on the wall of the valve chamber and allowing 45.degree. angle of flow between inlet and outlet ports.
A boiler comprising a housing, a boiler heat exchange zone within the housing, a duct bypassing said heat exchange zone, a valve within said housing and comprising wall means defining a valve chamber, a valve member and means mounting said valve member for rotation in said valve chamber about an axis extending centrally of said valve chamber between first and second positions, said valve member having peripheral surface means in sealing relationship with said wall means including opposite end portions in sealing relationship with respective portions of said wall means which are separated both peripherally and longitudinally of said valve chamber, said wall means defining a first outlet port leading to said heat exchange zone and a second outlet port leading to said duct bypassing said heat exchange zone and an inlet port which is put in communication only with said first outlet port by rotation of said valve member about said axis to said first position, said inlet port being put in communication only with said second port by rotation of said valve member about said axis to said second position, and said inlet port being put in communication with both said outlet ports by rotation of said valve member about said axis to any intermediate position between said first and second positions, said valve member in any of said intermediate positions cooperating with said wall means to define two passage means respectively contiguous with said boiler and said duct, the ratio of the proportions of said passage means being variable in response to said rotation of said valve member between said first and second positions.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
With cylindrical plug: having all the connecting conduits situated in more than one plane perpendicular to the axis of the plug
With pivoted closure members, e.g. butterfly valves: the closure members being pivoted around an essentially central axis
The heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines: waste heat boilers with supplementary firing
Supply and exhaust: rotary valve
Term ended 25 Oct 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The invention relates to valves, especially though not exclusively gas divertor valves applicable to waste heat recovery or other boilers for the purpose of diverting the hot gas stream either through or over the boiler tubes or through a gas by-pass.
Such valves are known but suffer from the drawback of involving relatively complicated construction, especially involving the use of cylindrical sleeve-shaped valve members having a multiplicity of apertures, which present considerable resistance to the flow of hot gas through the valve. Also, known valves do not provide optimum flow paths for the gas stream but cause sudden and severe changes in the direction of gas flow and eddying, which further reduces the efficiency of the valve. The valve is particularly applicable to waste heat recovery from heat engines such as diesel engines, where resistance to gas flow through the valve must be minimised in order to minimise loss of power from the heat engine.
Known valves tend to be such as to accumulate deposits where the gas stream, such as the exhaust gas stream from a diesel engine, contains carbon and other solid particles.
In the drawings:-
FIG. 1 is a diagrammatic longitudinal section through one embodiment of valve;
FIG. 2 is a diagrammatic longitudinal section through another embodiment of valve;
FIG. 1 shows a valve which has a valve housing 10 in which there is a cylindrical valve chamber 12 containing an elliptical valve member 14 which is mounted at an angle of 45.degree. to the central longitudinal axis 16 of the chamber 12. The valve member 14 is an elliptical plate the periphery of which fits in sealing relationship as closely as possible to the cylindrical wall of the chamber 12, allowing for thermal expansions so as to permit rotation of the valve member. The valve member 14 is mounted on a shaft (FIG. 3 not shown in FIG. 1), which passes through a central aperture in the plate and has its longitudinal central axis coincident with the axis 16. The valve member 14 is braced by two radially-extending tie bars (not shown) each of which extends along the central axis of the chamber 12, and which is rotatable to change the position of the valve member 14.
The valve housing 10 has an inlet port 20 and a first outlet port 22. The housing 10 has a second outlet port 24.
The valve member 14 is shown by full lines in a first position in which a fluid entering the inlet port 20 is diverted to the first outlet 22. The valve member 14 can be rotated through 180.degree. into a second position 14a indicated by broken lines in which a fluid entering the inlet 20 is diverted to the outlet 24.