Device for adjusting an air volumetric flow rate

Abstract

A device for adjusting an air volume flow, in particular in an air distribution network, having a central air channel having a through-flowable cross section and a throttle which is arranged in the central air channel. The through-flowable cross section can be changed by the throttle. An inner flow element has a covering, the circumference of which increases in the direction away from the throttle. The central air channel has in the region of the flow element a tapering and a subsequent re-expansion, whereby a curved flow channel is produced between the covering of the inner flow element and the re-expansion and terminates in the direction toward an outer side of the device. The inventive device enables a simple adjustability of the volume flow, a simple measurement of the volume flow and, when used as a supply air valve, an optimum flow distribution.

1 . A device for adjusting an air volume flow, in particular in an air distribution network,
 wherein the device has a central air channel having a through-flowable cross section and a throttle which is arranged in the central air channel, wherein the through-flowable cross section can be changed by means of the throttle,   wherein   the device further has an inner flow element having a covering, the circumference of which increases in the direction away from the throttle, and wherein   the central air channel has in the region of the flow element a tapering and a subsequent re-expansion, whereby a curved flow channel is produced between the covering of the inner flow element and the re-expansion and terminates in the direction toward an outer side of the device.   
     
     
         2 . The device as claimed in  claim 1 , wherein the device has a housing which forms the central air channel and which has an inner wall which forms the tapering and the re-expansion. 
     
     
         3 . The device as claimed in  claim 2 , wherein the housing is substantially circular-cylindrical. 
     
     
         4 . The device as claimed in  claim 2 , wherein the housing has a circumferential first guiding face, a circumferential second guiding face and a projection located therebetween. 
     
     
         5 . The device as claimed in  claim 4 , wherein the first guiding face faces the throttle. 
     
     
         6 . The device as claimed in  claim 4 , wherein the second guiding face extends parallel with the outer covering of the inner flow element. 
     
     
         7 . The device as claimed in  claim 2 , wherein the housing can be retained in a clamping manner in a wall or ceiling opening. 
     
     
         8 . The device as claimed in  claim 1 , wherein it can be arranged flush or only slightly protruding with respect to a surface of a wall or ceiling. 
     
     
         9 . The device as claimed in  claim 1 , wherein the flow channel has over the length thereof a cross section which remains unchanged when the setting of the throttle is changed. 
     
     
         10 . The device as claimed in  claim 1 , wherein the inner flow element expands in a bell-like manner. 
     
     
         11 . The device as claimed in  claim 1 , wherein the re-expansion has an inner wall which expands in a bell-like manner. 
     
     
         12 . The device as claimed in  claim 1 , wherein the inner flow element when the through-flowable cross section is changed remains fixed in an axial direction of the device with respect to the tapering and the re-expansion. 
     
     
         13 . The device as claimed in  claim 1 , wherein the covering of the flow element and/or the tapering and/or the re-expansion are configured in a rotationally symmetrical manner. 
     
     
         14 . The device as claimed in  claim 1 , wherein the device has a housing which forms the central air channel and which has an inner wall which forms the tapering and the re-expansion. 
     
     
         15 . The device as claimed in  claim 1 , wherein a measurement unit is provided to determine the volume flow. 
     
     
         16 . The device as claimed in  claim 15 , wherein the flow channel has over the length thereof a cross section which remains unchanged when the setting of the throttle is changed and wherein the measurement unit has a sensor element which is arranged in the flow channel. 
     
     
         17 . The device as claimed in  claim 1 , wherein the inner flow element has a through-opening which extends from the throttle up to a side opposite the throttle. 
     
     
         18 . The device as claimed in  claim 17 , wherein a measurement unit is provided to determine the volume flow and wherein the measurement unit is secured in the inner flow element. 
     
     
         19 . The device as claimed in  claim 17 , wherein the throttle can, in the installed state of the device, be adjusted via the access opening in order to change the through-flowable cross section. 
     
     
         20 . The device as claimed in  claim 17 , wherein the access opening in the installed state of the device can be repeatedly closed and released by means of a cover. 
     
     
         21 . The device as claimed in  claim 1 , wherein the throttle in order to change the through-flowable cross section has vanes which can be rotated relative to each other. 
     
     
         22 . The device as claimed in  claim 1 , wherein the throttle has curved inflow faces.