Abstract: An improvement of the duct-cleaning unit is disclosed for scraping the deposits from the inner surface of the flow line, which are residual in the flow lines after the completion of conveyance of any fluid material to thereby clean the flow lines as well as recover the material left in the tubing. The improvement is comprised of a pair of spherical guiding bodies coupled to lengthwise opposing ends of a connector member, one to each end, through universal joints. The spherical guiding bodies are each provided at the location near the connector with an annular pressure-carrying surface that makes fluid-tight contact at its outermost periphery with the inner surface of the tubing. The design of the present invention may make the cleaning unit smaller in size, so that the residual deposits in flow lines, in particular, at the relatively small radius bent in the flow line, may be reliably removed and pumped out the flow lines with the result of the high efficiency in cleaning process.

Abstract: This invention relates to an improvement in a cleaning apparatus for a raw material transfer pipe of the type in which a cleaning member having a pressure-receiving recessed region coming into sliding contact with the inner wall of the transfer pipe for transferring a viscous or powdery raw material is fitted into the transfer pipe, and a pressurized fluid is supplied to the pressure-receiving recessed region of the cleaning member to pressure-feed the cleaning member inside the transfer pipe and to wipe off and remove any residue adhering to the wall of the transfer pipe. The present invention disposes integrally spherical guide members having a diameter smaller than the inner diameter of the transfer pipe at the front and rear regions of the cleaning member via elastic reduced diameter shaft regions.

Abstract: A water-sealed type vacuum pump characterized in that a suction pipe connected to a chamber to be vacuumized above liquid containing cylinders, which are provided at the lower portion thereof with a mechanism for alternatively increasing and decreasing a pressure of liquid, is open to a lower portion of a suction chamber through an intake valve, the liquid containing cylinders each being interiorly provided with a valve means so as to discharge the liquid through the valve means when the liquid pressure is high while to suck air from the suction pipe when the liquid pressure is low, and a liquid circulating device is provided to return the liquid to be discharged thereby effecting stabilized suction and discharge, the liquid containing cylinders being further interiorly provided with a fluid cooling device to cool and liquidize the sucked air.