| 摘要 |
Air flow measuring device comprising a straight section of pipe 21 with a hollow restrictor 2 mounted therein, which restrictor is formed as a cylindrical container with flat end walls 6, 7. The external diameter of the restrictor 2 is less than the internal diameter of the section of pipe 21, so that a ring-shaped throttle gap 16 is created between the outside of the restrictor and the inside of the section of pipe. The restrictor has two internal pressure chambers 9, 10 separated by a transverse partition 8 inside the restrictor. At the centre of the end walls 6, 7 of the restrictor there are pressure outlets 13 from which are taken leads 14, 14' designed to be connected to a pressure difference meter, to determine the pressure difference between the chambers in the restrictor. In each end wall there are through holes 15 whereby the internal chambers are in connection with the area outside the end walls 6, 7. The invention also relates to the use of such a measuring device as a measurement indicator in an air regulator device E in an airtight air regulation box A intended for central regulation of the flow of air to rooms or apartments. <IMAGE> |
