US 12,472,477 B2 · Control of a flow generator in a tank

Abstract

The invention relates to a method for controlling a flow generator (1) in a tank (20) configured for housing a liquid comprising solid matter, the flow generator (1) comprising an impeller and being located at a height (h-mixer) in the tank (20) and the tank (20) having a predetermined maximum filling height (h-max), wherein the flow generator (1) is configured to be operated at a variable operational speed (n) and the demand of operational speed (n-demand) is dependent on the present liquid level height (h-present) in the tank (20), wherein a max operational speed (n-max) of the flow generator (1) is the operational speed required when the liquid level in the tank (20) is equal to the maximum filling height (h-max), the present operational speed (n-present) being set equal to the demand of operational speed (n-demand) of the flow generator (1) that is determined using the formula: ( n - present ) = ( n - demand ) = ( n - max ) [ ( h - max ) / ( h - present ) ] ^ a at least when [(h-mixer)+X]≤(h-present)≤(h-max), wherein a≥(¼) and a<1, X=radius of the impeller of the flow generator+1, and all heights and measures are given in meter.

Claims11

Dependent claims

A method for controlling a flow generator in a tank configured for housing a liquid comprising solid matter, the flow generator comprising an impeller located at a height (h-mixer) in the tank and the tank having a predetermined maximum filling height (h-max), the method comprising:

operating the flow generator at a variable operational speed (n) with a demand of operational speed (n-demand) dependent on a present liquid level height (h-present) in the tank,
wherein a max operational speed (n-max) of the flow generator is an operational speed required when a liquid level in the tank is equal to the maximum filling height (h-max), and a present operational speed (n-present) is set equal to a demand of operational speed (n-demand) of the flow generator determined using the formula:
(
n
-
present
)
=
(
n
-
demand
)
=
(
n
-
max
)
[
(
h
-
max
)
/
(
h
-
present
)
]
^
a
at least when [(h-mixer)+X]≤(h-present)≤(h-max),
wherein a≥(¼) and a<1,
X=radius of the impeller of the flow generator+1, and
all heights and measures are given in meters.

35 more elements

A tank configured for housing a liquid comprising solid matter, comprising:

a flow generator having an impeller located at a height (h-mixer) in the tank, the tank having a predetermined maximum filling height (h-max);
a control unit configured for operating the flow generator at a variable operational speed (n);
and
height detection means for determining a present liquid level height (h-present) in the tank,
wherein a max operational speed (n-max) of the flow generator is the operational speed required when a liquid level in the tank is equal to the maximum filling height (h-max),
wherein the control unit is configured to set a present operational speed (n-present) of the flow generator equal to a demand of operational speed (n-demand) that is dependent on the present liquid level height (h-present), using the formula:
(
n
-
present
)
=
(
n
-
demand
)
=
(
n
-
max
)
[
(
h
-
max
)
/
(
h
-
present
)
]
^
a
at least when [(h-mixer)+X]≤(h-present)≤(h-max),
wherein a≥(¼) and a<1,
X=radius of the impeller of the flow generator+1, and
all heights and measures are given in meter.

39 more elements

Dependencies are inferred from the claim text.

Control of a flow generator in a tank

Life of this patent

Control of a flow generator in a tank

Life of this patent

Abstract

Claims11