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Measuring mechanical seal spring specific pressure sensor research Sun Jun Nanjing Chemical School, Jiangsu Nanjing 210048 spring specific pressure measurement is treatable. Also pointed out. The developed force sensor is placed on the improved mechanical seal static ring seat to facilitate the understanding of the spring specific pressure of the mechanical seal during installation and working, to ensure the sealing performance symbol indicates the static ring outer diameter, d3 bellows inner diameter D moving ring the inside diameter of!
K load factor X back pressure coefficient Ph end face seal specific pressure, touch 3 Pu seal nine N Pi shape, and the friction between the inner wall of the sealed cavity nine NR static ring seat overall force, NP end face reaction force, N electrochemical corrosion. At the start of the plant, a carbon steel garment is formed by static and dynamic vanaidization of the system. The dense layer flow plate has a fixed gap, and the high-speed potassium lye and air flow pass through the gap to destroy the dense oxide protective film, so that the carbon steel shell here is exposed to the corrosive medium, and severe corrosion occurs. Corrosion rate up to 1012 In 1983, the shell was replaced with a view of 9, and until 1997, no corrosion occurred.
The total content of ethanolamine in the composition, the corrosion of the tube sheet is mainly caused by crevice corrosion and erosion caused by erosion. Since the upper portion of the reboiler does not have an evaporation space, the tube is washed by a high-speed potassium-alkaline gas stream to reduce perforation. In order to alleviate the scouring of the tube production and the tube sheet by the potassium-alkali flow, the rice has a type of evaporating space; a type of mouth-shaped tube type reboiler, and the material of the tube tube plate is selected from 89 tubes, and the cost is reduced by using AMlCrl8Xi9nWUfHra. When the front boiling oil core of the evaporating space is selected to be made of carbon steel, the gap between the pipe and the tube plate is minimized to reduce crevice corrosion. 4 Recommendation 1 It is best to use 14819 Ding which can resist acid corrosion. Especially in the initial design, you should choose the material to avoid the investment. The reboiler with evaporation space should be selected, and the tube plate baffle plate controls the mass concentration of 5+4+ in the solution to prolong the service life of the equipment. Clean the container filter regularly to avoid too much solid particles in the solution, thus reducing the rate of erosion corrosion. The selection of corrosion-resistant materials combined with process anti-corrosion should be an important way for oil refineries to prevent corrosion at low temperature parts. The sealing performance of 2000 mechanical seals is affected by the seal specific pressure. The seal is larger than the pressure. The leak is small. Mechanical seals have large wear and tear;
The leakage is large and the sealing specific pressure between the end faces is controlled. Good sealing performance and long service life can be achieved.
During the installation process, the seal pressure between the end faces of the mechanical seal is difficult to control. In terms of the empirical formulas that people commonly use, only a rough application range of the end face than the pressure is given. The mechanical density used on the specific device is different from the end face specific pressure. No value. Another aspect. The mechanical seal is inside the machine, and the amount of compression of the elastic element is so difficult to measure that the seal specific pressure is not known. Based on this question, the author designed a force sensor to measure the spring specific pressure of the in-service mechanical seal. Through the test, the optimal specific pressure of the mechanical seal on the specific device can be determined, and it is also possible to ensure that the in-service mechanical seal is working under this pressure during the installation process, achieving good sealing performance and long service life.
There are many scientific and technological authors who have conducted in-depth research on the effect of mechanical seal end face pressure on sealing performance. 23. Design end face ratio 1; domestic push value. 2.434 due to the standard 1; large, it is difficult to achieve a good sealing effect for the mechanical seal of a specific device. When the upper limit is pressed, the end wear ring is larger, which shortens the service life of the mechanical seal. When the lower limit is pressed, the seal may be tight and leakage may occur. The relevant literature points out that 3, the mechanical seal under constant medium pressure, especially the balance type mechanical density for the static ring force sensor as a whole can be seen from the formula 3, under the constant medium pressure, for a certain special machine seal. The mouth is measured and Dan. It is possible to derive the spring specific pressure of the mechanical seal in the state.
Friction is measured by placing the movable force sensor static ring seat in the sealed cavity. Without filling the medium, the slow forward force sensor static ring seat is read from the secondary instrument when the position is stable. The electrical signal of the friction between the sealing ring and the sealing cavity on the outer diameter of the force sensor can be obtained by conversion.
Dynamic lower core measurement The total force acting on the static ring of the force sensor can be obtained by using the output electrical signal value read on the measuring instrument and multiplying the force coefficient obtained by the calibration, ie = 1.
(3) The ratio of the bombs to the pressure is determined by the type of factory.
2 The sensor structure and the measuring instrument force sensor have a shaft hole in the middle, and the measurement accuracy is high, and the general force sensor is difficult to meet the requirements. The force sensor structure used by the author on the test device 2. The strain gauge arrangement 3 force sensor seal, the specific pressure of the spring in the end face specific pressure composition is a factor that affects the mechanical seal performance.
1 bomb, the principle of pressure measurement is mechanically sealed. The force sensor is used to read the relevant data from the secondary sensor of the force sensor in the axial direction, and the spring force is calculated. The spring specific pressure device is half-bridge strain type, the bridge arm resistance is 2,360. For the application of the moving ring 3, when the medium pressure is outside. 0.222392=86.063=Study on the mechanical seal performance of the liquid ammonia pump of petrochemical equipment Li Baoyan Li Shuhua Xue Changquan 2. Daqing Shibo School of Mechanical Engineering. Black Dragon; 1 Anda 1514002 Daqing. Daran 1 company. Heilongjiang. People celebrate 163256 reasons. It is determined that the sealing performance and service life of the liquid ammonia pump have been greatly improved after the modification of the transformation scheme, which improves the working environment, and the economic benefits are very significant. At the same time, it also provides a reference for solving the sealing problem of volatile media. Pressure difference at inner diameter, 3 pc end face specific pressure, over Pt saturated vapor pressure, rib seal outer radius, symbol indicates n seal face radius, m Vf liquid ammonia kinematic viscosity, 1 at 28 X film pressure coefficient K critical film Pressure coefficient B balance coefficient 4 Conclusion 1 Measure the spring after the pressure 艮 according to the external + outside can be obtained the end face seal ratio torsion æ”¹å˜ 2 change the mechanical seal static ring seat structure form the series force sensor, you can measure the spring under dynamic The specific pressure value is used to complete the control of the end face specific pressure. The successful use of the human and force sensors on the mechanical seal test device provides a possibility to understand the seal specific pressure state of the in-service mechanical seal. It can be pre-prepared that the developed force sensor is placed on the improved mechanical seal static ring seat to realize the automatic control of the sealing surface pressure of the in-service mechanical seal face to ensure the sealing performance and service life, which will be an important course for the future research of mechanical seal.
Sun Jun. Experimental study on balanced bellows mechanical seals. Petrochemicals are mechanically dense. Beijing Chemical Industry Press, 1981.
Wang Yuming. From the 10th International Fluid Seal Conference, the basic research trends of mechanical seals are Li Jihe, Cai Jining, Lin Xuehai. Mechanical sealing technology is called. Beijing Chemical Industry is out of Xiaoxiang. The effect of spring specific pressure on mechanical seal leakage. Chemical and general machine M, Li Weiming, Wang Jialiang. Discussion on the value of back pressure coefficient in mechanical seal design parameters
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