Diagnosis and elimination of abnormal faults Because the measuring part consists of two intermeshing elliptical gears, shafts and housings (which form a measuring chamber with elliptical gears), the flowmeter must never measure the flow of solid particles or impurities. medium. In routine maintenance, the most common failure of such instruments is that the instrument contains no indications because the debris contained in the medium enters the cavity with the fluid entering the gear. At this point, it is only necessary to disassemble and clean the gears. However, with the constant changes in the manufacturing process and application conditions of the instrument, especially in some complex industrial production environments, some abnormal fault conditions will occur, which brings great difficulty to the calibration staff.
Starting from the above basic structure, the abnormal fault of the so-called elliptical gear flowmeter mainly occurs in two aspects: one is the measurement part (metering room) failure, and the other is the detection conversion part failure. The resulting instrument failure phenomenon is that there is enough media flow in the pipe, but the instrument indicates that the flow is zero.
Such a flow meter has a complicated structure, is bulky, is inconvenient to install and maintain, and has certain defects in its measurement. Since the elliptical gear flowmeter itself relies on the front and rear indenters of the measured medium to push the gear to rotate, and the metal gear has a large specific gravity, and the required indenter power is also large, the requirements for fluid power are high. In recent years, many flowmeter manufacturers have introduced the use of different lightweight chemical materials instead of metal to manufacture gears, and with integrated pulse sensors, to create a compact and flexible application. High precision oval gear flowmeter. For example, the US TUTHILL TS30SC oval gear flowmeter used in the new PVA plant of Sichuan Vinylon Plant is a gear made of polyurethane vulcanized resin.
However, another aspect of the non-metallic material is that the hardness is low and the coefficient of thermal expansion is large, so that some flowmeters applied to special process conditions or stages are prone to abnormal deformation, breakage or even chipping of the gear, thereby increasing the instrument. Failure rate. Mainly can be summarized as the following aspects: abnormal parts caused by measurement parts failure under high temperature conditions, due to thermal expansion of gears, bushings and other components caused by the two gears stuck to each other or stuck with the cavity. Generally speaking, the industrial production situation is stable. The designer considers the temperature and pressure indicators under normal production conditions when selecting the instrument, but in some special operation stages, such as: water distillation before the device is put into production, During the trial operation and other stages, it is inevitable that the temperature, pressure and other indicators will exceed the normal value.
Conclusion The above describes the abnormal fault diagnosis and elimination process of the elliptical gear flowmeter in actual use. The author believes that as long as we continue to summarize and explore in practice, and with the continuous advancement of science and technology, we will be able to research and produce more. The new and more durable new elliptical gear flowmeters provide a safer and wider space for the use of industrial instrumentation.
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