Design and Test of Precession Gear Reducer for Submersible Screw Pump

- May 17, 2018-

The design and test of the precession gear reducer for submersible screw pump (School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110023, Liaoning, China) Tian Fangtao Ke Jiangfang took a precession gear reducer. It is widely applied to multi-machine mining in a well and offshore shelf oil exploitation. It is an emerging advanced oil recovery method.

At present, Russia, the United States, Canada and other countries have all adopted the underground drive screw pump oil production system for oil extraction. Its oil in the low oil level and high oil/gas ratio oil wells is more than 5 times higher than the displacement of piston pumps. It is especially suitable for high viscosity and high content. Sand well operation characteristics.

At present, this work has just been carried out in China, but there are still problems in this area of the reducer. Usually, involute planetary speed reducers and other conventional forms are used. Due to the limitation of its structural size, the gear modulus selected by it is too small. Satisfy the requirements of bending strength and contact strength, the service life is short and there is no practical use value.

1 New type of precession type reducer The new type of precession type reducer adopts the method of tooth rolling engagement. The tooth shape of its center gear is a cone-cycloid, and the planetary wheel is a cone roll. They are multi-tooth mesh and have strong bearing capacity. Since the planetary gears in the meshing transmission are precessional motions, the engagement is a cone-cylinder, so the radial dimension is small and the structure is very compact. Therefore, the characteristics of the new type of advance reducer can meet the special requirements of the downhole oil recovery system for the reducer. There are 2KH type and KHV type available. Its structure sees and.

Two-acting speed reducer selection and parameter determination for one year.

2.2 Determination of transmission form K-H-V drive only has 4 moving parts, input shaft (tie-H) planetary G, center wheel B and output mechanism V here the output mechanism V is a spherical coupling with spherical motion Due to the difficulty in solving the problems of structure and manufacturing process, the transmission form was abandoned.

The number of H-type moving parts is greater than the number of K-H-V type moving parts, but problems in design and manufacturing are easier to solve. Therefore, this type of transmission is used in the speed reducer. The 2K-H type is a two-stage deceleration. When the transmission ratio is not required, the previous stage can be degraded to a zero-difference transmission with a reduction ratio of 1 to form an output mechanism. The latter stage is geared according to the transmission ratio requirements.

2.3 Determination of basic parameters The main parameters of the 2K―H type precession reducer are § center wheel b roller arrangement angle § center wheel c roller arrangement corner 0 chapter rotor angle planet gi roller cone angle Pg2 planet gear g2 roll Sub-cone angle>zc(g2) Center wheel, number of roller teeth - Average diameter of gear Re(2,3)) R/(2 3) Cone pitch long tooth of roller wheel 2.1 Requirements of an oil field on reducer Transmission power P = 10kW, transmission ratio i Roller wheel average cone width A precession transmission is a space less tooth difference planetary transmission, any parameter in which a slight change in one of the parameters can change the entire tooth profile, impact on the meshing characteristics Large, here is the optimization of the design method to meet the various performance constraints, geometric constraints and other conditions, the pursuit of the highest efficiency, the calculation of the best solution and a round three pyramidal cycloidal center gear processing cone cycloid gear can be used CNC machining The center carries out the processing, but its processing cost is high, and the tooth surface precision is low, cannot meet the meshing characteristic requirement.

We use an auxiliary device that satisfies the motion law of the cone in the hobbing machine. The cutting and grinding cone cycloid gears have high precision and meshing characteristics.

4 Gearbox Performance Test 4.1 Transmission Efficiency Tester As shown in the figure, 1 is a 15kW DC motor, 2 and 4 are ZYW1 torque and speed sensors, 3 is a measured speed reducer, and 5 is a speed increaser (speed ratio i=10), 6 is a 15kW generator. The tested reducer was loaded with 460 heavy duty industrial gear oil.

The test results show that the transmission efficiency curve of the reducer changes with the number of input revolutions as shown. The transmission efficiency under the rated load reaches 83.2%. 4.2 Overload test = 1000r/min, running for 10 minutes according to the rated torque of 110% (1050.5Nm) is safe and reliable.

4.3 Temperature rise test C In the room, under the full load working condition of the speed reducer, the temperature of the deceleration body was measured after two hours of continuous operation. Stable at the test device Conclusion The 2K-H type transmission mechanism adopts zero tooth difference instead of the output mechanism to facilitate processing. .

(3) Through experiments, the developed reducer meets the requirements of the oilfield.