Dynamic Analysis Of The Middle Ring In Mechanical Seal

The controllable the middle ring mechanical seal is a new device that the middle ring speed controllable mechanical seal. According to consult relevant literature and introduced to the development of the traditional mechanical seal device, working principle and the typical structure. Compare the pluses and minuses of the traditional mechanical seal, the introduction of new design structural; And analyzed the influence of the main parameters of the sealing device in the sealing ring vibration occurs under stable operation conditions.The situation that the non-contact mechanical seal sealing surface is relatively low-speed and unstable in low speed state, by analyzing the overall principle and structure of the traditional mechanical seal on the basis of the theory of TRIZ to the technical conflict as the breakthrough point using the principle of article39engineering parameters and40invention inventive to resolve technical conflicts contradictions, and converted into specific solutions-regulator principle (24)"and" combination principle (5),to take the setting of middle of the speed control rotating ring and the method of gearing mechanism driving middle of the rotating ring. This improves the relatively low speed and not the stability of the status of non-contact mechanical seal under low speed condition, improve the stability and service life of a mechanical seal And in accordance with the principles of the regulator and the combination principle, to select the gear train wheel as the driving device to change speed of the middle ring and make the structure design and feasibility analysis for the entire device,In the mechanical seal system, the amount of leakage and service life is to evaluate the performance of key indicators In actual operation, due to the impact of changes in working conditions or sealing, the sealing ring more or less will produce vibration, thus affecting the normal operation of the entire sealing system the study of the impact of its vibration is very important.(1) After joining the middle ring, selecting the middle ring and static ring as the research object, with static rings for floating ring for force analysis, to determine the parameters of leakage, contact force, the liquid film force calculation equation deriv.(2) Analysis of the characteristics of the movement under stable operation conditions.in under the condition of increasing nutation and precession to establish seal ring vibration model and derive the stationary ring of the axial force equation and the calculation of the amount of leakage equation and impact of nutation and precession generated combined to derive the equation of the liquid membrane force and the contact force of the sealing ring face, to obtain a liquid film pressure distribution curve at different radius. Finally, in the case of a coupled motion analysis of amount of leakage changes.(3) According to the equation, using MATLAB programming, respectively, in the case of analyze the change the face angle, the stiffness of the spring, the medium pressure inside and outside for the impact of axial displacement of the sealing liquid membrane pressure contact force, the amount of leakage, and other parameters, and analyzed the impact of the entire sealing system. For the face angle, the increase of Angle, liquid film pressure and the total liquid film pressure is increases, the contact force is reduced, leakage is increase; For the stiffness of the spring, the greater the stiffness, the total pressure of the liquid film is reduced, the contact force is increases, the leakage amount is reduced; For the impact of internal and outernal medium pressure, the impact of the change in pressure on the inner dielectric seal vibration weaker impact compared to the outer pressure of the medium, the greater the pressure of the outernal medium, the sealing medium is more easily enters the seal face, causing the end surface of the liquid film pressure is increases, the contact force is reduced, and the inner diameter increased pressure will cause an increase of leakage.Four parameters change will impact the sealing system, but as long as the parameter value is within a predetermined range, the balance between the sealing ring is destroyed will be re-established, though ultimately the whole sealing system running will not cause big damage, but the system will be adversely affected.