METHOD OF ASSEMBLING POSITIVE DISPLACEMENT MOTOR SECTIONAL STATOR Russian patent published in 2012 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: first section with left-and-right threaded ends is clamped in assembly chuck. Adapter with left-and-right threaded ends is screwed in said first section to make gap H equal to 15-20 mm. Second stator section is screwed on adapter second threaded end to make the gap identical to that of first section. Then, mounting appliance made up of core with screw surface fitting with that of sections to be jointed together is inserted through first section into second sections o that their screw surfaces are aligned. Gaps H with allowance of ±0.3 mm is are retained. With said screw surfaces of both sections jointed together, core is driven to second section end. Then, first section is released from aforesaid chuck to clamp core therein and to clamp adapter therein. Now, chuck is switched on so that its rotation is transferred to both sections. Sections are screwed on adapter toward each other unless gaps H are taken up and threads are tightened as required.

EFFECT: faster assembly.

2 cl, 2 dwg