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Process for damping pressure pulsations and apparatus for performing the process
| Details |
Inventors: Munch, Rudolf;
Assignee: Sulzer-Escher Wyss GmbH (Ravensburg, DE)
Primary Examiner: Chin; Peter
Assistant Examiner:
Attorney, Agent or Firm: Greenblum & Bernstein P.L.C.
Process for damping pressure pulsations and apparatus for performing the process. The process of this invention serves for the damping of pressure pulsations in a fluid, particularly a fiber suspension, flowing in a closed system wherein the pressure pulsations to be damped are measured at a measuring site and compensated at a correction site, with a throttle position being located between the measuring and the correction sites, with the damping of the imparted pressure impulses occurring at the correction site, which pressure impulses are opposite to the measured pressure pulsations, with the time periods thereof being about the same as those of the measured pressure pulsations. Several apparatuses for performing the process are also set forth. |
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DETAILED DESCRIPTION This invention has the task or object to produce a process for the damping of oscillations in order to increase the effectiveness of known damping systems at the least possible expense.
Specifically, the process of this invention pertains to the damping of pressure pulsations in a fluid, such as a fiber suspension, flowing in a closed system, the process comprising measuring, in at least one place within the system, at a measuring site, pressure pulsations that are to be damped; imparting, in at least one further place within the system, at a correction site, pressure impulses into the flowing fluid; and influencing the pressure impulses according to the time, the indication and the strength of the measurement signals of the pressure pulsation measurement, with the pressure drop within the flowing fluid, between the measuring site and the correction site, being at least half as large as the pressure drop between the correction site and the exit of the flowing fluid from the closed system; with the imparted pressure impulses being, each time, opposite to the pressure pulsations measured at the measuring site as well as occurring in one of substantially at the same time as, and slightly later than, the measured pressure pulsations at the measuring site.
A further embodiment of the process of this invention includes, locating the correction site after the measuring site in the fluid flow direction.
Preferably the pressure drop, between the measuring site and the correction site ranges between 0.
3 and 3 bar.
Another embodiment of the process of this invention includes, producing the pressure impulses by the deformation of a wall adjoining the fluid at the correction site.
An additional embodiment of the process of this invention includes, producing the pressure impulses via one of the addition and subtraction of a fluid at the correction site.
In a differing embodiment of the process of this invention, the fluid flow, after passing the correction site, undergoes a further pressure drop of at least 1 bar
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Metal Working 
