Valve control method and device
AssigneeHarburg-Freudenberger Maschinenbau GmbH
InventorAndreas Stöhrmann
Life of this patent
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Abstract
A method and the device are used to control valves. The valves are arranged in the region of lines for a fluid. At least one first valve is in the form of a control valve arranged in the region of a primary line. At least one second valve is in the form of a switching valve. At least one branch is arranged downstream of the control valve in the region of a direction of flow. At least two secondary lines extend downstream of the branch. Each secondary line has one of the switching valves. The valves are connected to a control unit which coordinates the function of the valves.
Claims11
A valve control device, comprising:
- a plurality of lines for a fluid, including at least two primary lines and at least one secondary supply line;
- a plurality of valves arranged in a region of the plurality of lines, wherein at least two of the valves are switching valves, wherein in a region of each primary line there is arranged one of the switching valves, wherein at least one of the plurality of valves is a closed-loop control valve arranged in the at least one secondary supply line, wherein the plurality of lines includes at least one branch arranged downstream of the at least one closed-loop control valve in a direction of flow, and at least two secondary lines that extend downstream of the at least one branch, wherein the plurality of valves further includes at least one switching valve in each secondary line;
- and a control unit that controls function of the plurality of valves, wherein the valves of the plurality of valves are connected to the control unit so as to form at least one closed-loop control circuit, wherein the valves of the plurality of valves are designed to control superheated steam, saturated steam, heat transfer fluid and/or refrigeration transfer fluid, and wherein at least one of the secondary lines is connected to one of the primary lines by a merger, wherein the arrangement of the valves of the plurality of valves and the control unit for at least one closed-loop control circuit are combined to form a combination of a P-closed-loop control system and a sequential PI or PID closed-loop control system.
A method for controlling valves, wherein the valves are arranged in a region of lines for a fluid, wherein the fluid is supplied to a respective closed-loop control circuit through at least one primary line in each case and influences a closed-loop control variable of the respective closed-loop control circuit, the method comprising the steps of:
- directly or indirectly capturing actual values of the closed-loop control variable in the respective closed-loop control circuit using a sensor;
- determining a difference between the actual value of the closed-loop control variable and a desired value;
- controlling valves assigned to the respective closed-loop control circuit in a closed-loop manner based on the closed-loop control variable by actuating the valves assigned to the respective closed-loop control circuit with a control unit so that the fluid flows through lines in which the valves are arranged according to valve states, wherein at least two switching valves are respectively arranged in primary lines and at least one closed-loop control valve is arranged in at one secondary supply line and a switching valve is respectively arranged in each of at least two secondary lines branching off from the at least one secondary supply line, wherein actuating the valves with the control unit includes actuating the at least two switching valves arranged in the primary lines to be opened or closed;
- opening at least one of the switching valves arranged in the secondary lines;
- and actuating the at least one closed-loop control valve in a further step to adjust volumetric flow of the fluid flowing through the at least one secondary supply line so that the volumetric flow of the fluid through the at least one secondary supply line is added to volumetric flow of the fluid through at least one primary line for at least one closed-loop control circuit.
Dependencies are inferred from the claim text.