Air venting
AssigneeGrundfos Holding A/S
InventorsBjarne Dindler Rasmussen, Lars Sund Mortensen, Ole Bech-Lisberg, Mathias Skødt Larsen
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Abstract
The invention relates in a first aspect to method of venting air out of a closed fluid system comprising a number of inter connected pipes configured for flow of a fluid, a variable speed pump configured for controlling the volume flow of fluid in said fluid system and an air venting device configured to let air out from the fluid system, the method comprising operating said pump in at least three phases.
Claims20
A method of venting air out of a closed fluid system, the closed fluid system including a number of inter connected pipes configured for flow of a fluid, a variable speed pump configured for controlling the volume flow of fluid in said fluid system by varying a rotational speed of the pump and an air venting device configured to let air out from the fluid system, the method comprising:
- operating said pump in at least three phases, wherein:
- in a first phase, said variable speed pump is operated by varying the rotational speed of the pump to provide a number of first flow pulses in said fluid system each having a pulse width being shorter than a first pulse width;
- in a second phase, during which air, if present in said fluid, is detected;
- and
- in a third phase, said variable speed pump is operated by varying the rotational speed of the pump to provide a number of third flow pulses in said fluid system each having a pulse width being longer than said first pulse width.
Dependencies are inferred from the claim text.