Measuring system with a flow conditioner for flow profile stabilization
First Claim
1. A measuring system inserted into the course of a process line for registering at least one measured variable of a medium flowing in the process line, said measuring system comprising:
- a circular-cylindrical measuring transducer, including a measuring tube which serves for conveying the medium to be measured and which shows a smaller flow cross section than a supply segment of the process line connected to an inlet of the measuring system;
a sensor arrangement which includes at least one sensor element reacting primarily to said variable to be registered and/or reacting primarily to changes of said variable to be registered, and provides, by means of the at least one sensor element, at least one measurement signal influenced by the measured variable; and
a measuring electronics communicating with the measuring transducer and producing, taking into consideration the at least one measurement signal, at least one measured value instantaneously representing the measured variable; and
a flow conditioner arranged at an inlet of said measuring tube, said flow conditioner mediating between said measuring tube and the supply segment of the process line, said flow conditioner showing a lumen which tapers toward said measuring tube, and through which medium flows during operation, an inlet end of said flow conditioner, facing the supply segment of the process line, shows a flow cross section which is greater than the flow cross section of said measuring tube, and an outlet end of said flow conditioner, facing toward said measuring tube, shows a flow cross section which is smaller than the flow cross section of the inlet end of said flow conditioner, wherein;
said flow conditioner includes, arranged upstream of its outlet end, at least a first inner edge protruding into the lumen of said flow conditioner and against which medium conveyed in said flow conditioner flows during operation;
said flow conditioner also includes, arranged downstream from the first inner edge, at least a second inner edge likewise protruding into the lumen of said flow conditioner and against which medium conveyed in said flow conditioner flows during operation, and said flow conditioner also includes a first guide surface serving to guide medium flowing in said flow conditioner and a second guide surface serving to guide medium flowing in said flow conditioner, said first guide surface extending between the first inner edge and the second inner edge, and said second guide surface extending from the second inner edge in the direction of the outlet end of said flow conditioner, andsaid flow conditioner shows an installed length, which is smaller than an installed length of said measuring tube, so that an installed length ratio, defined by a ratio of the installed length of said flow conditioner to the install length of said measuring tube, is kept smaller than one.
1 Assignment
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Accused Products
Abstract
A measuring system is inserted into the course of a process line for a flowing medium and includes a measuring transducer with a measuring tube for conveying the medium and with a sensor arrangement for generating at least one measurement signal influenced by a measured variable of the medium. The measuring tube shows a smaller flow cross section than a supply segment of the process line, connected to the inlet end of the measuring system. The measuring system further includes a flow conditioner, arranged at the inlet end of the measuring tube and mediating between the measuring tube and the supply segment. The flow conditioner shows a lumen tapering towards the measuring tube, and includes at least two inner edges arranged upstream of its outlet end and protruding into the lumen of the flow conditioner. Between the first inner edge and the second inner edge, there extends additionally, a first guide surface of the flow conditioner. Moreover, the second inner edge bounds a second guide surface extending towards the outlet end of the flow conditioner and serving for guiding medium flowing in the flow container during operation.
60 Citations
33 Claims
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1. A measuring system inserted into the course of a process line for registering at least one measured variable of a medium flowing in the process line, said measuring system comprising:
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a circular-cylindrical measuring transducer, including a measuring tube which serves for conveying the medium to be measured and which shows a smaller flow cross section than a supply segment of the process line connected to an inlet of the measuring system; a sensor arrangement which includes at least one sensor element reacting primarily to said variable to be registered and/or reacting primarily to changes of said variable to be registered, and provides, by means of the at least one sensor element, at least one measurement signal influenced by the measured variable; and a measuring electronics communicating with the measuring transducer and producing, taking into consideration the at least one measurement signal, at least one measured value instantaneously representing the measured variable; and a flow conditioner arranged at an inlet of said measuring tube, said flow conditioner mediating between said measuring tube and the supply segment of the process line, said flow conditioner showing a lumen which tapers toward said measuring tube, and through which medium flows during operation, an inlet end of said flow conditioner, facing the supply segment of the process line, shows a flow cross section which is greater than the flow cross section of said measuring tube, and an outlet end of said flow conditioner, facing toward said measuring tube, shows a flow cross section which is smaller than the flow cross section of the inlet end of said flow conditioner, wherein; said flow conditioner includes, arranged upstream of its outlet end, at least a first inner edge protruding into the lumen of said flow conditioner and against which medium conveyed in said flow conditioner flows during operation; said flow conditioner also includes, arranged downstream from the first inner edge, at least a second inner edge likewise protruding into the lumen of said flow conditioner and against which medium conveyed in said flow conditioner flows during operation, and said flow conditioner also includes a first guide surface serving to guide medium flowing in said flow conditioner and a second guide surface serving to guide medium flowing in said flow conditioner, said first guide surface extending between the first inner edge and the second inner edge, and said second guide surface extending from the second inner edge in the direction of the outlet end of said flow conditioner, and said flow conditioner shows an installed length, which is smaller than an installed length of said measuring tube, so that an installed length ratio, defined by a ratio of the installed length of said flow conditioner to the install length of said measuring tube, is kept smaller than one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for registering at least one measured variable, of a medium flowing in a process line, by means of a measuring system inserted into the course of the process line, said measuring system including a flow conditioner connected to a supply segment of the process line, as well as a measuring transducer connected to the flow conditioner, said method comprising:
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allowing medium to be measured to flow out of the supply segment into the flow conditioner; accelerating the flowing medium in the direction of a longitudinal axis of the flow conditioner; inducing at least one essentially stationary toroidal vortex within medium flowing in an inlet region of the flow conditioner in a manner such that a principal axis of greatest inertia of the at least one toroidal vortex essentially coincides with the longitudinal axis of the flow conditioner, and/or a longitudinal axis of the measuring tube; allowing the medium being measured to flow past the at least one toroidal vortex; and allowing the medium being measured to flow out of the flow conditioner into a measuring tube of the connected measuring transducer, as well as producing at least one measurement signal influenced by the measured variable to be registered, by application of at least one sensor element reacting primarily to the measured variable, especially also to changes in the same, wherein the step of inducing the at least one, essentially stationary, toroidal vortex in the inlet region of the flow conditioner includes steps of; allowing medium to flow past a first inner edge of the flow conditioner protruding into a lumen of the flow conditioner as well as allowing medium to flow past a second inner edge of the flow conditioner located downstream from the first inner edge and protruding into a lumen of the flow conditioner. - View Dependent Claims (32, 33)
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Specification