Patent ID: 8778066

Claim:
A vacuum pump exhaust pipe of a chemical vapor deposition apparatus, wherein two ports of the vacuum pump exhaust pipe are respectively connected to a vacuum pump outlet and a scrubber, characterized in that anti-sticking inner pipes are installed inside the exhaust pipe and contacted with inner walls of the exhaust pipe, and a material of the anti-sticking inner pipes is Polytetrafluoroethene, and the anti-sticking inner pipes are installed at a joint of the vacuum pump outlet and the exhaust pipe and at a joint of the scrubber and the exhaust pipe to configure said joints to prevent accumulation of powder particles generated by gases through the exhaust pipe while pressure ascension, and outer surfaces of portions of the exhaust pipe, which are not installed with the anti-sticking inner pipes where a temperature difference between the exhaust pipe and exhaust gases occurs, are attached with heating tapes.