| 摘要 |
A system is providing for simultaneously addressing the problems of deadhead pumping, dry pumping, and seal failure in progressive cavity pumps. The system uses a hydraulic channel (23, 25, 26) which runs from the pump's rotor (5) to the pump's hydraulic motor (21) and includes the spaces defined by the seals (17) for the joints (8A, 8B) in the drive line for the rotor (5). At the rotor (5), the system includes a plug (19) which melts at a predetermined temperature. The hydraulic channel (23, 25, 26) is filled with lubricating oil and is pressurized. A drop in pressure either as a result of the melting of the plug (19) or a break in the integrity of the seals (17) is detected and used to stop the operation of the pump's motor (21). The system is resistant to disablement by operators.
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