Analysis of Unbalanced Force of Rotary Piston of Slide Valve Vacuum Pump

Fund Project: The Shanghai City's new product research project funded project (96161004007) passed the crank rocker mechanism of Zhejiang Vacuum Equipment Factory. Give this simplified process. In the figure, O is the center of the pump shaft, A is the center of the eccentric, B is the center of the piston guide, AC is the rotary piston, k is the pump shaft speed, and e is the inertia moment of the eccentric rotating piston: XJ2 or more is the force value of the rotor The function of the corner (kt).

1.1 Analysis of residual inertia force of a single cylinder pump is a spatial force system diagram of a single cylinder pump. Because the inertia force of the eccentric wheel is completely balanced, the balance weight of the balance eccentric wheel can be removed from the total counterweight, and then the inertia force of the rotary piston can be added to calculate the remaining inertia force. H-150A residual inertia force and torque calculation formula is as follows: x weight center of mass coordinates 1.23 cylinder pump residual inertia force analysis for the 3-cylinder pump space force cylinder pump long and short eccentric force inertia cancel each other, so the residual inertia force and torque For the long and short three rotating piston inertia force generated by the resultant force and resultant torque assuming the direction of inertial force as shown in the figure, the actual direction is opposite to the direction of the picture, it is a negative value, and then take 2 as the center of the moment, then the residual moment of inertia is F|Long eccentric eccentric inertial force; F F2-―Long rotation piston inertial force Y axial component; F2―Short rotation piston inertial force X axial component; F2”-―Short rotation piston inertial force Y axial division Forces; Mc and M'c are the moments of inertia of the long and short-rotating pistons. The moment of inertia of the long-rotating piston F2F2 and the inertia of the short-rotating piston F'2F'2 The moment is 0, so the residual moment of inertia is M2(F) = M(F2) + 2Mz(F'2) Hu Lin, et al.: Analysis of rotary piston unbalance force of slide valve vacuum pump xc,yc Short rotary piston center-of-mass coordinate 23 types Comparison of the residual inertial force and torque of the rotary piston of the pump type Based on the analysis, the residual inertial forces and moments of the GKT-300AB, H-150, and H-150A spool pumps at different rotational angles (servo=kt) are calculated and calculated, as shown in Fig. 7. Data and comparisons, see the residual inertia moment comparison chart of H-150A pump and H-150 pump listed in Table 1 Comparison of the residual moment of inertia of GKT-300AB pump and H-150A pump Chart 1 Remaining inertial force and moment of 3 pump types Comparing pump type F average/N from - and Table 1 can be seen: H-150A has the smallest remaining inertial force, and the change is relatively gentle. The remaining inertia force of H-150 is much larger than that of H-150A. The maximum value of about 3 8 times in the vicinity and the undulation is large is mainly because the H-150 pump does not balance the inertial force of the rotary piston, and the remaining inertial force of the GKT-300AB is somewhere in between.The residual moment of inertia is also H-150 The largest is GKT-300 AB, and the second is H-150 A. The residual inertia force causes horizontal and vertical vibrations of the pump, while the residual moment of inertia causes the pump to rotate around the Z axis (horizontal axis), causing the vertical vibration to be represented by GKT-300AB. The 3-cylinder structure of the slide valve pump relies on 3 rotors to achieve self-balancing. Due to the 3-cylinder pump rotor structure As a result, the remaining inertial force is fixed and cannot be further optimized. The single-cylinder pump is equipped with an optimal elastomer|J|. PolyBull, 1988, 20(1):131-136. |||Cao Bing, Zhu Congshan.Preparation of inorganic isolated membranes using organically modified methyltriethoxysilane |J|.Journal of Portland University, 1998,26(6):769-772.(Editor Zhu Zhongwen) Then, on page 111), the inertial force can be greatly reduced, the balance effect is better than the 3-cylinder pump, plus the 3-cylinder pump is complicated, the cost is high, and the processing and assembly are difficult. Therefore, the single-cylinder pump is more developed than the 3-cylinder pump. Of course, after balancing the inertial forces, we must also pay attention to whether or not there are other problems. Due to lack of space, it is not necessary to analyze the balance effect of the balance between the inertia force and the torque of the slide valve pump. Wheels and pulleys are equipped with weights to maximize the balance of the rotary piston, allowing the balance of the single-cylinder pump to reach a more desirable level. By reducing the unbalanced inertia force through the rotary valve's own balance of the rotary piston, it is also a feasible solution. |. Hefei Industrial University University (Natural Science), 1986,9 (2): 5: a 60. Editor Zhu Hua new)

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