Method and means for controlling a flow through an expander
AssigneeSvenska Rotor Maskiner AB
InventorHenrik Ohman
Life of this patent
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Abstract
A method and apparatus for controlling the flow of a working medium through an expansion device in a closed heating system which also includes a condenser, a pump and a boiler. The expansion device is a helical screw rotor expander that has an inlet port with an inlet line connected thereto, and an outlet port. The expansion device drives an energy producing device, such as a generator. The helical screw rotor expander has an intermediate pressure port between the inlet port and the outlet port, and a branch line is connected between the intermediate pressure port and a branching point in the inlet line. A valve is in the branch line. The flow of working medium through the valve to the intermediate pressure port is controlled as a function of a state parameter.
Claims8
A method of controlling the flow of working medium through an expansion device for use in a closed heating system which in addition to the expansion device also includes a condenser, a pump and a boiler, wherein the expansion device consists in a helical screw rotor expander that has an inlet port an inlet line connected thereto, and an outlet port, wherein the expansion device drives an energy producing device, for instance a generator, the method comprising:
- providing the helical screw rotor expander with an intermediate pressure port between the inlet port and the outlet port, by connecting the intermediate pressure port with the inlet line via a branch line between the intermediate pressure port and a branching point in the inlet line, and by including a valve in the branch line, and
- controlling the flow of working medium through the valve to the intermediate pressure port as a function of a state parameter.
An arrangement for controlling the flow of working medium through an expansion device for use in a closed heating system which in addition to the expansion device also includes a condenser, a pump and a boiler together with requisite connection lines, wherein the expansion device includes a helical screw rotor expander that has an inlet port an inlet line connected thereto, and an outlet port, and wherein the expansion device drives an energy producing device, wherein:
- the helical screw rotor expander includes an intermediate pressure port between the inlet port and the outlet port
- a branch line which is provided connects the intermediate pressure port with the inlet line at a branching point, and
- a valve is provided in the branch line.
Dependencies are inferred from the claim text.