| 摘要 |
PURPOSE:To enable to prevent sticking of powder particles to the wall surface of a suction chamber, by forming the suction chamber with a rigid porous material, and developing an air flow directed toward the inside of the suction chamber through pores formed in the porous material. CONSTITUTION:A suction chamber defining member 10, made of a porous material having pores the diameters of which are smaller than the minimum diameter of particles contained in a liquid to be conveyed, is disposed in the manner of surrounding a nozzle 1 concentrically with each other. The suction chamber defining member 10 defines therein a suction chamber 9 which consists of a cylindrical section 9a and a tapered section 9a having a diameter reduced gradually toward its top. In pump operation of the apparatus, a small amount of air is drawn into the suction chamber 9 via a pipe 13, a hollow space 12 and pores of the member 10 by the function negative pressure developed in the suction chamber 9. Therefore, sticking and accumulation of powder particles on the inner wall surface of the suction chamber 9 can be prevented by the air ejected into the chamber 9. |
