Mass flow rate measuring device with dual electrodes
First Claim
1. In a device for measuring a mass flow which is deflected at the outlet of an elevator (E) at a conveyor shaft wall (G), in particular of a harvester, such that it forms a stratified dielectric with a homogeneous speed in a flow rate measuring capacitor (MC) disposed there, a capacitance of the capacitor being a function of the fill level and being continuously measured,wherein a first capacitor plate (MC1) of the capacitor is disposed at a mass flow front side and a second capacitor plate (MC2) of the capacitor is disposed at a distance from the mass flow,and wherein the first capacitor plate (MC1) is bordered by a first protective electrode (R1) which is kept at the same potential with the first capacitor plate (MC1) enclosed by the first protective electrode by an impedance transformer means for keeping at a same potential,and wherein the second capacitor plate (MC2) is formed by a portion of the conveyor shaft wall located opposite the first capacitor plate (MC1) and by lateral areas of the conveyor shaft wall;
- the improvement comprising;
in addition to the first protective electrode (R1), the device includes at least one partial second protective electrode (R2) which by a switching means is held at a different potential of the first protective electrode (R1) and the first protective electrode (R1) extends at least partially perpendicular to the front side on the side walls of the conveyor shaft between the two capacitor plates (MC1, MC2) over at least a partial height (h1, h2) of the mass flow (KS).
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Accused Products
Abstract
The invention relates to the type of device for measuring a mass flow in a harvester, where the flow is deflected at the outlet of an elevator (E) at a conveyor shaft wall (G) to form a stratified homogeneous flow and the flow is continuously measured as a function of the fill level by a capacitor (MC). The capacitor has a first capacitor plate (MC1) at a mass flow front side and a second capacitor plate (MC2) at a distance from the mass flow. The first capacitor plate is bordered and enclosed by a first protective electrode (R1) held at the same potential as the first capacitor plate by an impedance transformer. The second capacitor plate includes a portion of the conveyor shaft wall located opposite the first capacitor plate (MC1) and by lateral areas of the conveyor shaft wall. The invention improves this type of device by adding to the first protective electrode at least one partial second protective electrode (R2), where the first protective electrode (R1) extends at least partially perpendicular to the front side on the side walls of the conveyor shaft between the two capacitor plates (MC1, MC2) over at least a partial height (h1, h2) of the mass flow.
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Citations
18 Claims
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1. In a device for measuring a mass flow which is deflected at the outlet of an elevator (E) at a conveyor shaft wall (G), in particular of a harvester, such that it forms a stratified dielectric with a homogeneous speed in a flow rate measuring capacitor (MC) disposed there, a capacitance of the capacitor being a function of the fill level and being continuously measured,
wherein a first capacitor plate (MC1) of the capacitor is disposed at a mass flow front side and a second capacitor plate (MC2) of the capacitor is disposed at a distance from the mass flow, and wherein the first capacitor plate (MC1) is bordered by a first protective electrode (R1) which is kept at the same potential with the first capacitor plate (MC1) enclosed by the first protective electrode by an impedance transformer means for keeping at a same potential, and wherein the second capacitor plate (MC2) is formed by a portion of the conveyor shaft wall located opposite the first capacitor plate (MC1) and by lateral areas of the conveyor shaft wall; - the improvement comprising;
in addition to the first protective electrode (R1), the device includes at least one partial second protective electrode (R2) which by a switching means is held at a different potential of the first protective electrode (R1) and the first protective electrode (R1) extends at least partially perpendicular to the front side on the side walls of the conveyor shaft between the two capacitor plates (MC1, MC2) over at least a partial height (h1, h2) of the mass flow (KS). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- the improvement comprising;
Specification