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Self-priming chemical pump

A self-priming chemical pump comprising: a pump portion including at least an impeller and a shaft supporting said impeller; a self-priming mechanism portion including a self-priming chamber which is provided in the discharge side of a vortex chamber of said impeller so as to communicate with a discharge opening, and a suction chamber which is provided in the suction side of said vortex chamber of said impeller so as to communicate with a suction opening; a seal wall which is provided in the vicinity of the discharge side of said vortex chamber to form a slight gap along the outer circumference of said impeller; and a circulation hole which is provided in said self-priming chamber so as to be located inside the outer circumference of said impeller, wherein said suction chamber comprises an L-shaped suction passage for making said suction opening communicate with the suction side of said vortex chamber, and a self-priming liquid remaining portion having pores communicating with said suction passage; and wherein said self-priming chemical pump further comprises a siphon-cut shortest passage which is provided in said suction passage, and the volume of said self-priming chamber is substantially equal to the volume of said suction chamber. In the self-priming chemical pump configured as described above, when the impeller is rotated, liquid remaining in the suction chamber is discharged to the discharge side of the vortex chamber by the centrifugal force of the impeller and at the same time liquid remaining in the self-priming chamber is directly injected into the impeller from the circulation hole located in the inside of the outer circumference of the impeller so that the liquid remaining in the self-priming chamber as well as the liquid remaining in the suction chamber are discharged rapidly to the discharge side of the vortex chamber by the centrifugal force of the impeller so as to be moved to the self-priming chamber. Accordingly, the negative pressure at the center portion of the impeller becomes high, so that liquid in the suction piping is moved up whereas air is mixed with the liquid given from the suction chamber and the circulation hole and is discharged to the self-priming chamber from the vortex chamber. The air sucked together with the liquid from the suction chamber in this occasion is prevented from circulating in the vortex chamber by the seal wall of the vortex chamber. Accordingly, the air is moved with the liquid to the self-priming chamber. Then, the air light in specific gravity is discharged from the discharge opening whereas the liquid is reserved in the self-priming chamber so that the liquid is directly injected into the impeller from the circulation hole again so as to circulate. After the air is discharged thoroughly from the suction piping, the suction chamber, the vortex chamber and the self-priming chamber, a steady-state operation is carried out. On the other hand, when the impeller is stopped, liquid in the suction piping falls down so as to flow backward. As a result, the pressure in the suction chamber becomes negative, so that the liquid surface in the discharge side passage of the vortex chamber is moved down so as to be lower than the level of the suction side passage of the vortex chamber. In this occasion, air is made to escape from the suction opening via the suction chamber so as to be siphon-cut. Accordingly, liquid is not made to escape any more.

                                                                                                                    Shanghai Kaida Pump Mfg. Co., Ltd.

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