Flow meter having a rotary body

In a flow meter, particularly for liquids, having an impeller which is arranged in a vertical line and can be driven by a flow stream flowing through the line, the impeller having a bearing shaft the ends of which are rotatably mounted in an axially and radially guiding bearing, at least one vane of the impeller having a flow-on surface inclined to the direction of the oncoming flow, and a sensor which detects the rotary frequency of the impeller, the improvement wherein

• the shaft is disposed with axial play between said bearings,
• the impeller is arranged in the line such that it is acted on by the flow stream from below,
• the flow-on surface of the impeller is inclined relative to the direction of the oncoming flow in such a manner that the force component in the direction of the flow of the force exerted by the flow stream on the impeller is at least equal to the weight of the impeller,
• flow straighteners arranged in said line in front of and behind the impeller as seen in the direction of the flow,
• said bearings are arranged in front sides of said flow straighteners facing said impeller,
• a housing block,
• said line is a continuous measurement bore formed within and completely through said housing block, said impeller and said straighteners being axially inserted in said bore, and
• means comprising closures for closing outer ends of said measurement bore, respectively.

In a flow meter, particularly for liquids, having an impeller which is arranged in a vertical line and can be driven by a flow stream flowing through the line, the impeller having a bearing shaft the ends of which are rotatably mounted in an axially and radially guiding bearing, at least one vane of the impeller having a flow-on surface inclined to the direction of the oncoming flow, and a sensor which detects the rotary frequency of the impeller, the improvement wherein

• the shaft is disposed with axial play between said bearings,
• the impeller is arranged in the line such that it is acted on by the flow stream from below,
• the flow-on surface of the impeller is inclined relative to the direction of the oncoming flow in such a manner that the force component in the direction of the flow of the force exerted by the flow stream on the impeller is at least equal to the weight of the impeller,
• flow straighteners arranged in said line in front of and behind the impeller as seen in the direction of the flow,
• said bearings are arranged in front sides of said flow straighteners facing said impeller,
• a housing block,
• said line is a continuous measurement bore formed within said housing block, said impeller and said straighteners are axially inserted in said bore, and
• said housing block is formed with an inlet bore and an outlet bore communicating with said measurement bore in a radial direction relative thereto.

In a flow meter, particularly for liquids, having an impeller which is arranged in a vertical line and can be driven by a flow stream flowing through the line, the impeller having a bearing shaft the ends of which are rotatably mounted in an axially and radially guiding bearing, at least one vane of the impeller having a flow-on surface inclined to the direction of the oncoming flow, and a sensor which detects the rotary frequency of the impeller, the improvement wherein

• the shaft is disposed with axial play between said bearings,
• the impeller is arranged in the line such that it is acted on by the flow stream from below,
• the flow-on surface of the impeller is inclined relative to the direction of the oncoming flow in such a manner that the force component in the direction of the flow of the force exerted by the flow stream on the impeller is at least equal to the weight of the impeller,
• flow straighteners arranged in said line in front of and behind the impeller as seen in the direction of the flow,
• said bearings are arranged in front sides of said flow straighteners facing said impeller,
• a housing block,
• said line is a continuous measurement bore formed within said housing block, said impeller and said straighteners are axially inserted in said bore,
• said housing block comprises two housing halves, each of said housing halves forms a chamber half having the shape of a pot, defining an opening, said openings of said chamber halves are directed towards each other,
• a diaphragm has a circumferential edge arranged between surfaces of said housing halves adjacent said openings,
• means for clamping together said surfaces of said housing halves with said diaphragm therebetween, and
• said chamber halves communicate with said measurement bore upstream and downstream of said impeller, respectively.

In a flow meter, particularly for liquids, having an impeller which is arranged in a vertical line and can be driven by a flow stream flowing through the line, the impeller having a bearing shaft the ends of which are rotatably mounted in an axially and radially guiding bearing, at least one vane of the impeller having a flow-on surface inclined to the direction of the oncoming flow, and a sensor which detects the rotary frequency of the impeller, the improvement wherein

• the shaft is disposed with axial play between said bearings,
• the impeller is arranged in the line such that it is acted on by the flow stream from below,
• the flow-on surface of the impeller is inclined relative to the direction of the oncoming flow in such a manner that the force component in the direction of the flow of the force exerted by the flow stream on the impeller is at least equal to the weight of the impeller,
• an inlet chamber half,
• an inlet bore communicating with said inlet chamber half and said line, and
• a gas separation valve is connected to an upwardly directed region of said inlet bore or of said said inlet chamber half.