A kind of screw drilling tool motorTechnical field
This utility model relates to a kind of screw drilling tool motor, belongs to oil drilling and Science Drilling technical field.
Background technology
Conventional underground power drilling has turbodrill and helicoid hydraulic motor.Helicoid hydraulic motor is a kind of positive displacement mud motor.Contrast turbodrill, helicoid hydraulic motor has the feature of low rotation speed large torque.
As it is shown in figure 1, existing screw drilling tool motor is to be made up of rotor 1, stator metal shell 2, stator rubber liner 3, rotor 1 is metal material.Owing to stator rubber liner 3 is by temperature and down-hole complex conditions, the most aging there is breakage simultaneously；Rotor, on the premise of long-time use, easily cracks and destroys.
Summary of the invention
The purpose of this utility model is to solve existing screw drilling tool motor weak point, it is provided that a kind of screw drilling tool motor, rotor and stator surface are covered by fibrous monolithic ceramic structure sheaf, thus solve the problems referred to above.
This utility model includes rotor, stator metal shell and stator rubber liner, rotor is positioned in stator metal shell, stator metal shell inwall inlays stator rubber liner, stator metal shell and stator rubber interliner constitute stator, rotor surface and stator rubber inner lining surface all scribble fibrous monolithic ceramic structure coating, rotor is spiral-shaped, the cross-sectional profiles line of rotor is connected with circular arc by cycloid, stator rubber liner helically shape, the cross-sectional profiles line of stator rubber liner is connected with circular arc by cycloid.
The thickness of described fibrous monolithic ceramic structure coating is 10 μm-50 μm.
The screw thread of stator and rotor is than for 2:1 or 4:3 or 6:5 or 8:7 or 10:9, and stator number of threads is usually even number.Stator can also be 3:2 or 5:4 or 7:6 or 9:8 with the screw thread ratio of rotor, and this screw thread is than not being conventional turbodrill screw thread ratio.
If described fibrous monolithic ceramic structure coating is to be made up of with cell space outer layer dry fibers cell space.
The cross section of fiber cell space is six sided structures, and the circumscribed circle diameter of six sided structures is 100 μm-500 μm；The thickness of cell space outer layer is the 1/10-1/6 of fiber cell space circumscribed circle diameter.
The material of fiber cell space is ZrC, HfC, TaC, Si3N4、SiC、ZrB2、HfB2、ZrO2Or Al2O3Deng, the material of cell space outer layer is W-Re, Re-Ni, Ni-Cr, Nb, graphite or h-BN etc..
Fibrous monolithic ceramic structure is by the deviation of crackle, the bridge joint of synusia, and the resistance making lead crack extend is substantially reduced, thus significantly improves the fracture property of material.
The beneficial effects of the utility model:
All scribbling fibrous monolithic ceramic structure coating at rotor surface and stator rubber inner lining surface, can be effectively improved the ability of helicoid hydraulic motor high temperature resistance, its fracture toughness reaches 20MPa m1/2Above.Can effectively prevent stator rubber liner to lose efficacy at high operating temperatures, prevent rotor wear out failure under the environment that works long hours simultaneously.
Accompanying drawing explanation
Fig. 1 is existing screw drilling tool stator and rotor cross-section schematic diagram.
Fig. 2 is cross sectional representation of the present utility model.
Fig. 3 fibrous monolithic ceramic of the present utility model structural material macro cross-section figure.
In figure: 1 rotor, 2 stator metal shells, 3 stator rubber liners, 4 fibrous monolithic ceramic structure coatings, 5 fiber cell spaces, 6 cell space outer layers.
Detailed description of the invention
Refer to shown in Fig. 2, this utility model includes rotor 1, stator metal shell 2 and stator rubber liner 3, rotor 1 is positioned in stator metal shell 2, stator metal shell 2 inwall inlays stator rubber liner 3, stator metal shell 2 and stator rubber liner 3 are bonded stator, rotor 1 surface and stator rubber liner 3 surface all scribble fibrous monolithic ceramic structure coating 4, rotor 1 is spiral-shaped, the cross-sectional profiles line of rotor 1 is connected with circular arc by cycloid, stator rubber liner 3 helically shape, the cross-sectional profiles line of stator rubber liner 3 is connected with circular arc by cycloid.The thickness of described fibrous monolithic ceramic structure coating 4 is 10 μm-50 μm.
The screw thread of stator and rotor 1 is than for 2:1 or 4:3 or 6:5 or 8:7 or 10:9, and stator number of threads is usually even number.Stator can also be 3:2 or 5:4 or 7:6 or 9:8 with the screw thread ratio of rotor 1, and this screw thread is than not being conventional turbodrill screw thread ratio.
Refer to shown in Fig. 3, if described fibrous monolithic ceramic structure coating 4 is to be made up of with cell space outer layer 6 dry fibers cell space 5.
The cross section of fiber cell space 5 is six sided structures, and the circumscribed circle diameter of six sided structures is 100 μm-500 μm；The thickness of cell space outer layer 6 is the 1/10-1/6 of fiber cell space 5 circumscribed circle diameter.
Fiber cell space 5 material be ZrC, HfC, TaC, Si3N4、SiC、ZrB2、HfB2、ZrO2Or Al2O3Deng, the material of cell space outer layer 6 is W-Re, Re-Ni, Ni-Cr, Nb, graphite or h-BN etc..
The beneficial effects of the utility model:
All scribbling fibrous monolithic ceramic structure coating 4 on rotor 1 surface and stator rubber liner 3 surface, can be effectively improved the ability of helicoid hydraulic motor high temperature resistance, its fracture toughness reaches 20MPa m1/2Above.Can effectively prevent stator rubber liner 3 to lose efficacy at high operating temperatures, prevent rotor 1 wear out failure under the environment that works long hours simultaneously.