Patent ID: 7516509
Filing Date: 2009-04-14
Classification: B08B

Abstract:
1. A pneumatic device for cleaning ventilation ducts, comprising a guiding air hammer, turning conduit, air-supply pipe, and a slewing mechanism for the conduit, said guiding air hammer being a hollow spherical or hemispherical shape, which is connected to the turning conduit, and the other end of said turning conduit connected fixedly with a turning pipe of the slewing mechanism for the conduit, and the air-supply pipe connected with an air inlet pipe on the other end of the slewing mechanism for the conduit, wherein air jets for cleaning and air jets for guiding are formed on a rear arc wall of said guiding air hammer, in which said air jets for cleaning are several proportionally distributed centripetal holes, whose center lines make an angle of 35°-65° with the center line of the guiding air hammer, and said air jets for guiding are two centripetal holes, whose center lines make an angle of 65°- 80° with the center line of the guiding air hammer, and the two center lines of air jets for guiding make an angle of 75°- 105° with each other; and said slewing mechanism for the conduit comprises a shell, stepper motor, revolving seal, turning pipe, air inlet pipe and an air inlet cover, in which the stepper motor is arranged in the back of said shell, and there is space between the stepper motor and the shell, and the air inlet cover is arranged on a shaft extension of a drive shaft of the stepper motor, and said revolving seal is installed in the front side of the shell, and the turning pipe is arranged inside the revolving seal, the turning pipe connecting fixedly with the air inlet cover, and the air inlet pipe connecting fixedly to the rear end of the shell.