| 摘要 |
Disclosed are a "method and device for work inside pipes" for very-high-powered travel inside pipes. The disclosed device is provided with an ring-shaped pressure-boundary seal, the free edges of which contact the inside walls of a pipe. The pressure-boundary seal divides the space inside the pipe into two spaces, space A and space B. The end of space A near the pressure-boundary seal is connected to a suction pump via a hose. The end of space A near the pressure-boundary seal is also connected to space B via a vacuum-breaking valve mechanism that adjusts the negative pressure inside space A. The other end of space A, away from the pressure-boundary seal, is closed. The hose is disposed inside space B. |
