Fluid handling – Processes
Patent
1985-01-07
1987-10-06
Cohan, Alan
Fluid handling
Processes
137519, 137556, 251285, 251286, 138 46, F17D 104, F15D 102
Patent
active
046976078
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a way in which to render equal the effect of gravity independent of the installation mode in flow regulators for gaseous substances, in particular for air in air-conditioning and ventilation installations, serving to maintain the volumetric flow of a gaseous substance at desired magnitude with sufficient accuracy when the differential pressure across the flow regulator varies within given limits, said flow regulator comprising an envelope and a regulating member turnably disposed in a flow passage confined by the envelope, the torque exerted by the flow of the gaseous substance on the regulating member and on the other hand a countertorque dependent on the position of the regulating member causing the regulating member turning in the flow passage to assume a position of equilibrium in which the required pressure drop is obtained for keeping the volumetric flow at predetermined magnitude.
The invention also concerns means for rendering equal the effect of gravity independent of the installation mode in flow regulators for gaseous substances, in particular for air in air-conditioning and ventilation installations, serving to maintain the volumetric flow of a gaseous substance at desired magnitude with sufficient accuracy when the differential pressure across the flow regulator varies within given limits, said flow regulator comprising an envelope and a regulating member turnably disposed in a flow passage confined by the envelope, the torque exerted by the flow of the gaseous substance on the regulating member and on the other hand a countertorque dependent on the position of the regulating member causing the regulating member turning in the flow passage to assume a position of equilibrium in which the required pressure drop is obtained for keeping the volumetric flow at predetermined magnitude.
In low pressure regulators of prior art, which allow fairly wide regulation of the volumetric flow set-point, the lowest pressure at which the means starts to operate increases with increasing volumetric flow rate. Even at small volumetric flows, the lowest pressure is usually relatively high. The high end pressure also increases with increasing volumetric flow rate set-point.
Because the lowest pressure is high and/or because it depends on the volumetric flow set-point value, the regulators of prior art, in order to function, require extra blower energy and possibly a bigger blower; owing to the increase of pressure they tend to cause noise problems; they impede the designing work, and they cause difficulties in the implementation phase of the installation.
In general, the setting of the volumetric flow in flow regulators at the site of installation with accuracy and steplessly is exceedingly difficult and often impossible in practice, particularly if the regulator has been installed already, and it is also a fact that the flow rate setting cannot be directly read. Regulators of prior art also do not allow the throttling pressure to be read with which the regulator impedes the flow. It is true that in certain regulator designs of prior art one may observe from the outside whether the regulator is within its operating range, but they allow no regulation of the volumetric flow rate.
A prerequisite of serial manufacturing, storing, distribution and convenient use of regulators is that they can with ease and accuracy be regulated at the site of installation, also after installation. It is important with a view to the balancing and inspection of an air conditioning installation that it is possible to observe from outside the regulator which set-point value of volumetric flow has been selected, whether the regulator is within its operating range, and how strongly the regulator throttles the flow.
In addition, the basic construction and the manufacturing technology of the regulator shall be such that the required calibration measures are as simple and as few as possible and independent of the setting of volumetric flow.
In regulators known at present, the movement
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Aalto Erkki
Yla-Hemmila Veikko
Cohan Alan
Halton Oy
Rivell John A.
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