Design And Research Of The Oil Explorating Timer Able To Resist High-temperature And Work In Long Period

Mechanical timer is the critical equipment of completely mechanical gauge used for oilexploration. During formation testing, the timer drives the metal recording card carrier torotate uniformly. The curve represents pressure changing over time in deep geologicalformations. By analyzing the curve, we can determine the oil content and exploitation valueof the wells. With the developments of deep wells, ultra-deep wells’ exploration, thetraditional mechanical timer can not meet the needs of working long and properly under hightemperature. Therefore, we need to improve the existing timer. In this paper, we designed anew timer whose product type is200JC—GK384h.On the base of analyzing mechanical properties of the spring, we designed a tandem dualspring structure which can meet the requirements of200JC-GK384h timer. This structurecould double the storage of the spring and reached timer’s design specifications by workinglong hours. What’s more, the less torque gap also ensures the accuracy of formation test datarecording.By comparing transmission characteristics and side gear clearance of several toothedgear, we designed a new gear train that correction cycloidal gear and double-circular-arcmodified cycloid gear could be used at the same time. The new gear train accelerates thetimer’s gear transmission system with increased transmission ratio, higher efficiency oftransmission, greater transmitting torque, stable torque transmission. And it can workproperly under high temperature.Based on AutoLISP language, we wrote the two-dimensional drawing program ofcorrection cycloidal gear and completed a parameterized design of correction cycloidal gear.It improved the accuracy of gear design and the designers’ working efficiency. By usingthree-dimensional software, we can get accurate three-dimensional model by stretching the2D sketch of correction cycloid gear. The model can be applied directly in CNC machining toensure the accuracy of the gear transmission movement, and laid foundation for the gearthermal deformation analysis.By analyzing of theory of engagement of double-circular-arc modified cycloid gear, we derived a tooth profile equation which is more accurate and its modeling is more convenient.We used parametric modeling in Pro/E software, combined withtooth profile equation,accomplished the accurate modeling of small modulus double-circular-arc modified cycloidgears and filled the blank of modeling small modulus double-circular-arc modified cycloidgears accurately in watch industry in the design, production, testing, simulation analysis.Finally, the software ANSYS Workbench is used to analyze thermal deformation ofdouble-circular-arc modified cycloid gears and cycloid gears. By analyzing the results of gearthermal-structural coupling, we discussed whether the200JC—GK384h timer’s geartransmission will interfere or not to provide a reference for determining reasonable initialmeshing gap. It is proved that gear transmission system improved in this paper worksproperly at320℃high temperature. In another word, it is a timer with hightemperature-resistance.