Grundfos Holding A/s

Lasse Søgaard Ledet

Brian Lundsted Poulsen

A fluid flow regulation assembly () includes: movable parts, for being actively mechanically driven, including at least one of a fluid flow regulating body for regulating a fluid flow and a rotor of a motor for driving the regulating body; and power electronics for controlling the motor. The movable parts and/or the power electronics are a source of vibration. Static parts are exposed to traveling vibrations originating from the source of vibration and include at least one of the group: a pump housing (), a valve housing, a motor housing (), a pump base and an electronics housing (). The static parts include a structural element () with at least one vibration attenuation section () for attenuating vibrations: that originate from the source of vibration; travel along the structural element and have a vibration frequency above a pre-determined minimum vibration frequency (f).

Fluid flow regulation assembly with vibration attenuation

A centrifugal pump includes at least one pump stage, with a rotatable impeller () with a suction port () which is sealed with respect to a stationary pump part () by way of a sealing arrangement. The sealing arrangement includes a sealing ring () between the impeller () and the stationary pump part (). The sealing arrangement is configured such that at least on delivery operation of the pump, the sealing arrangement has sealing sections which are distanced to the counter sealing surface and sealing sections which bear on the counter sealing surface, in an alternatingly successive manner considered in the peripheral direction of the sealing ring ().

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Aalborg, Denmark

Lasse Søgaard Ledet