1. There are generally some impurities in the medium, which will cause wear on the bearings and shafts, so that the gap between the two will increase, the dynamic balance of the moving parts will be destroyed, the rotational speed will drop, or the dirt will enter the gap, so that the motion resistance will increase. The speed drops. For these reasons, the display value of the meter is reduced, and a negative error occurs, which is unfavorable to the supplier of the fluid.
2. The fibrous or viscous impurities in the fluid are attached to the rotating part of the flowmeter, which increases the rotational resistance, resulting in a decrease in the indication value of the meter and a negative error, which is unfavorable to the supply side of the fluid.
3. The change of fluid temperature and pressure may cause the liquid in the pipeline to escape the air contained in the pipeline or because the pressure inside the pipeline is lower than the saturated vapor pressure of the fluid, causing some of the liquid to become steam, or may be caused by the negative pressure of the medium. The gas is sucked into the pipeline, and these gases flow with the liquid to be measured, causing the meter to increase in value and a positive error, which is unfavorable to the demand of the fluid.
4, the working environment is relatively harsh, for example, electromagnetic field interference, dust, high temperature, vibration, humidity, etc., may cause the turbine flow sensor malfunction or malfunction, directly cause the turbine flow meter indication error, the error is positive or negative The value may not be obvious or it may be completely invalid. For the above phenomenon, when it is more serious, problems can be found from the comparison of the working state of the process, and it is easy to take corresponding measures. However, in the early stages of the problem, problems cannot be discovered without special measures.
The engine is mainly composed of cylinder block, crankcase, cylinder head and cylinder head gasket. The crankcase, the part of the lower part of the cylinder block used to mount the crankshaft is called the crankcase, and the crankcase is divided into the crankcase and the lower crankcase. The upper crankcase is integrally formed with the cylinder block, and the lower crankcase is used for storing lubricating oil and closing the upper crankcase, so it is also called an oil sump, and the oil sump is rarely stressed, and is generally formed by stamping a thin steel plate. The shape depends on the overall arrangement of the engine and the capacity of the oil. The oil pan is equipped with a stabilizing oil baffle to prevent the oil surface from fluctuating excessively when the car is turned. The bottom of the oil pan is also equipped with an oil drain screw. Usually, the oil plug is equipped with a permanent magnet to absorb the metal chips in the lubricating oil and reduce the wear of the engine. A gasket is placed between the upper and lower crankcase joint surfaces to prevent oil leakage.
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