The upper and lower bodies come into contact, and the head of the central rod—equipped with a rail—enters the rail sleeve on the upper body. At this point, the head of the central rod is guided into the rail tube, where it triggers the downward compression of the spring as the upper and lower bodies begin to rotate relative to each other. Simultaneously, the upward movement of the sliding sleeve causes the rail key to engage fully with the corresponding rail groove, generating torque. As a result, the central rod rotates 90 degrees relative to the upper joint, ensuring that the rail key and groove achieve complete interlocking, thus completing the docking process.
When disengagement is required, the operator lifts the sucker rod, causing the脱接器 (disconnect device) to move upward until it releases the joint. As the sliding sleeve’s rail key disengages from the lower body’s rail groove, the upper and lower bodies rotate 90 degrees relative to each other once again. Finally, under the guidance of the rail tube, the head of the central rod moves upward and exits the system, completing the disconnection process.
Constant-pressure Drainage Device
The constant-pressure drain device shares essentially the same structure, operating principle, and usage method as the conventional baffle-type oil drain器—except that hydraulic pressure is applied directly into the tubing. This system pressure acts on a metal constant-pressure disc installed in the radial port of the drain device. When the pressure difference across the metal disc reaches a preset value, the disc ruptures and detaches, creating an oil-drainage and fluid-discharge hole that leads to the annulus between the tubing and casing. The core technology lies in replacing the traditional copper baffle of the conventional baffle-type oil drainer with a new type of constant-pressure disc used in the constant-pressure drain device. This innovative disc technology ensures that the opening pressure of the drain device is both precise and highly reliable.
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