The operation method for measuring the viscosimeter of insulating oil and oil products
2018/5/15 Viewers:
(1) the positive branch viscosity score controller and the wide tube two parts. In the middle, the U - shaped elbow is linked. The basic points are measuring balls, capillary tubes and storage devices. As shown in Figure 2.1, the ball is located at the top of the capillary and the reservoir is located on the side of the wide tube, and its horizontal position is lower than the capillary, causing the liquid to flow out under the static pressure of the liquid column in the viscometer. The lower end of the wide tube is flat and has a wide cross section. When the liquid is flowing, the fluctuation of the liquid column is smaller and smaller, and the error caused by the change of the height of the liquid column is reduced. The upper branch of the wide tube is for easy sampling. Determining the buffer ball above the ball ensures that the sample has enough volume and allows the liquid to absorb above the marking line so that it does not rush quickly to the upper end of the main bamboo.
(2) according to the capillary position, the viscometer is a straight tube viscometer, characterized by compact and Yi Hengwen.
(3) the amount of liquid required for the test is not much,
(4) using this viscosimeter to determine the viscosity is based on the theoretical basis of the Poisson equation combined with viscosity and flow, and the results can be easily obtained, and more accurate results can be obtained.
(5) the measuring range mainly depends on the length and diameter of the capillary tube. If there is a small tube viscometer with different diameters, it can be used for measuring the wider viscosity. (6) made of glass, it can be seen that liquid flows in the tube, which is easy to use and easy to wash. The specific requirements for the Ping viscometer include the following points: (1) the cross bearing surface of the capillary should be round, and the diameter of the whole length should be in the same spoon, and no expansion, skew and bending can be seen. (2) all welds should be smooth and smooth from a wider part to a welded joint with narrow edges. (3) the ring marking must be clearly engraved on the plane perpendicular to the axis of the pipe, and no disconnection is allowed. (4) the capillary viscometer used in the GB265-75 method generally does not consider the correction of the end effect, but in order to reduce the error, the capillary must have enough length (100 m). (5) when the capillary is selected, it is generally suitable for the liquid to enter the capillary and can still get the flow layer when the Reynolds number is larger than the general value. A capillary viscometer is selected for Rt<2000. GB265-75? Method stipulates that the flow time of the sample is within the range of 300 180S, the main purpose is to limit the velocity of liquid flow in the capillary, and to ensure that the liquid flow in the capillary is laminar flow. If the liquid velocity is too fast, it will become turbulent flow beyond a certain range. With the turbulence, the Poisson equation can not be applied to calculate the liquid viscosity. Moreover, due to the error of the outflow time reading, the error is large when the outflow time is too short. If the liquid flow rate is too slow, some high viscosity lubricants may get laminar flow. However, due to the difficulty of maintaining constant temperature during the determination time, the result of temperature measurement is often not allowed. However, when OC is used, the mixture of ice and water is easy to reach constant temperature, so the viscosity of high viscosity lubricating oil is determined at OC.
(2) according to the capillary position, the viscometer is a straight tube viscometer, characterized by compact and Yi Hengwen.
(3) the amount of liquid required for the test is not much,
(4) using this viscosimeter to determine the viscosity is based on the theoretical basis of the Poisson equation combined with viscosity and flow, and the results can be easily obtained, and more accurate results can be obtained.
(5) the measuring range mainly depends on the length and diameter of the capillary tube. If there is a small tube viscometer with different diameters, it can be used for measuring the wider viscosity. (6) made of glass, it can be seen that liquid flows in the tube, which is easy to use and easy to wash. The specific requirements for the Ping viscometer include the following points: (1) the cross bearing surface of the capillary should be round, and the diameter of the whole length should be in the same spoon, and no expansion, skew and bending can be seen. (2) all welds should be smooth and smooth from a wider part to a welded joint with narrow edges. (3) the ring marking must be clearly engraved on the plane perpendicular to the axis of the pipe, and no disconnection is allowed. (4) the capillary viscometer used in the GB265-75 method generally does not consider the correction of the end effect, but in order to reduce the error, the capillary must have enough length (100 m). (5) when the capillary is selected, it is generally suitable for the liquid to enter the capillary and can still get the flow layer when the Reynolds number is larger than the general value. A capillary viscometer is selected for Rt<2000. GB265-75? Method stipulates that the flow time of the sample is within the range of 300 180S, the main purpose is to limit the velocity of liquid flow in the capillary, and to ensure that the liquid flow in the capillary is laminar flow. If the liquid velocity is too fast, it will become turbulent flow beyond a certain range. With the turbulence, the Poisson equation can not be applied to calculate the liquid viscosity. Moreover, due to the error of the outflow time reading, the error is large when the outflow time is too short. If the liquid flow rate is too slow, some high viscosity lubricants may get laminar flow. However, due to the difficulty of maintaining constant temperature during the determination time, the result of temperature measurement is often not allowed. However, when OC is used, the mixture of ice and water is easy to reach constant temperature, so the viscosity of high viscosity lubricating oil is determined at OC.
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