Measuring and testing – Blower – pump – and hydraulic equipment
Patent
1988-09-23
1990-03-06
Yasich, Daniel M.
Measuring and testing
Blower, pump, and hydraulic equipment
73196, 244117R, G01F 100, G01M 1900
Patent
active
049055119
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fan assembly for an air system with a bulkhead and at least one fan extending through the bulkhead, whose intake on the aspiration side and whose outlet on the pressure side are located in chambers separated from each other by the bulkhead. Furthermore, the invention is concerned with a method for checking the function of a fan assembly fitted as part of an air system, in which the volumetric performance of the fan is tested.
In an air system the problem frequently arises of an excessively low fan performance having been prescribed vowing to an erroneous conception of the plant so that during operation the desired air flow volumetric performance is not reached, something that may lead to malfunction. Since so far no precise method of measuring the actually achieved volumetric performance has become available for an installed air system, the blame for an existing malfunction is often incorrectly attributed.
In view of this, one object of the present invention is to devise simple means for precisely ascertaining the volumetric performance of a fitted air system and of the fan assembly installed therein.
As regards the equipment this object is achieved insofar as adjacent to both sides of the bulkhead there is at least one pressure sensor with a pressure gage connection.
With the aid of such a fitted pressure sensor it thus becomes possible to ascertain the absolute value of the pressure differential to be produced by the fan, that is to say of the fan in the already fitted condition. For this purpose the two sensors merely have to be connected via their pressure gage connection with a suitable pressure gage, something that is possible anywhere, that is to say quite feasible either on site or in testing equipment, this leading to an extreme simplification of functional testing of an air system. In test equipment the permanently fitted pressure sensors may be used in order to log characteristic curves, which on site make possible the ascertainment of the volumetric performance on the basis of the measured pressure differential. Owing to the pressure sensors' being permanently fitted it is possible to ensure that reproducible conditions are produced and that right from the start the marginal conditions for fitted state are automatically taken into account. Owing to the fact that measurement of pressure takes place directly at the bulkhead, it is possible to be certain that only the static pressure is sensed and dynamic components are left out of consideration, this being an advantage as regards the possible accuracy and the reproducibility. With the aid of the invention it is thus possible to exactly derive the precise value of the actual volumetric performance from the reading obtained with the pressure sensor on site and thus in the event of malfunction to obtain information as to whether for instance the trouble is due to an initial erroneous assessment of the requirement or an erroneous calculation. The same also applies to continuous monitoring.
The method aspect of the invention is characterized in that characteristic curves are determined for the complete fan assembly with the fitted fan, such curves respectively reflecting, for a given speed of rotation of the fan, the change in the differential between the pressures obtaining on the two sides of the bulkhead in relation to the volumetric displacement and in that the volumetric displacement is determined on the basis of such characteristic curves and the fan speed of rotation and also the pressure differential as measured on site on the bulkhead. The permanently fitted pressure sensors may be used both while ascertaining the characteristic curves and also when ascertaining the volumetric displacement on site as a means for taking readings so that the same marginal conditions obtain, this being a precondition for the reproducibility and accuracy strived at.
In addition to monitoring from time to time, the invention makes it possible, as has been already indicated, to perform continuous monitoring. For this purpose it is possibl
REFERENCES:
patent: 2212186 (1940-08-01), Ricardo et al.
patent: 3402654 (1968-09-01), Berst
patent: 3733900 (1973-05-01), De Baun
patent: 4562744 (1986-01-01), Hall et al.
patent: 4638233 (1987-01-01), Erdman
AL-KO Polar GmbH Maschinenfabrik
Schindler Edwin D.
Yasich Daniel M.
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