Abstract: An integrated 3-D blade structure which consists of at least two integrated pieces made by one-time shaping. Each integrated piece has several shorter 3-D curved-face blades and the relative let-in structures. Via the said let-in structures, it is easily to match with the two integrated pieces at least. Then, the plural shorter blades could be matched with adjacent blades each other depending on different design and to form a complete 3-D curved-face blade, or keeping a little distance between the matching blades to become a “Multi-Row” blade structure. Originally, since the whole blade structure with complicate 3-D curved face has been divided to several shorter blades for manufacturing, they are made via plastic emergence with forming or wax forming. Therefore, not only the element amount is highly decreased, but also the cost for position and assembly of blades is going down.

Abstract: A sheet metal casing for multistage pump and its manufacturing method, the casing includes an outer shell and an inner shell. The outer shell is integrally formed and includes a front end ring, a step positioning ring, an outer shell surface and a positioning end. The inner shell is fixed to the inner side of the outer shell and includes an inner end, an inner shell surface and a step positioning rim. The step positioning rim forms a closed holding space with the outer shell surface for holding and squeezing a seal ring therein. When a plurality of casings being serially mounted on a spindle, the positioning end of a front casing may make contact with the step positioning ring of a rear casing, and the positioning rim of the front inner shell may make contact with the front end ring of the rear outer shell for axially positioning the casings on the spindle.

Abstract: A pump casing made of sheet metal for centrifugal pump includes a body, an impeller, an inlet double flange and an outlet double flange. The body has an inlet to engage with the inlet double flange, and an outlet to engage with the outlet double flange. Adjacent the circumference of the inlet double flange, there is a first flap flange fixed at one end thereon and extending along the outside wall of the body and being fixed and located remote from the inlet. Adjacent the circumference of the outlet double flange, there is a second flap flange fixed at one end thereon and extending along the outside wall of the body and connecting with the body and the inlet double flange. Both the first and second flap flanges can disperse the forces and stresses away from the inlet and outlet so that the pump casing can withstand greater forces and stresses which are typically caused by the internal forces of the piping system.

Abstract: A centrifugal pump impeller for easy positioning and avoid producing turbulence, includes a hub, a rear cover plate engaged with the hub, a front cover plate having an inlet at a front end thereof, and a plurality of vanes. Each vane has a front blade engaged with the front cover plate, a rear blade engaged with the rear cover plate and a blade to bridge the front and rear blade. The front blade has an indent section adjacent the inlet so that the front end of the front blade wont extend outside the front cover plate when the vane engages with the front cover plate. The rear blade has a curved front edge adjacent the spindle to make closed contact with the hub. The indent section and the curved front edge enable the impeller has smooth surface at the inlet without producing turbulence. The front and rear ends of the rear blade have respectively a vane balance hole and a positioning hole for the vane to be positioned between the front and rear cover plates precisely and easily.

Abstract: An pump casing for a sheet metal pump includes a pump body made by pressing or roll forming a sheet metal, a reinforced member which includes a water guide unit and a flange unit separately made by casting or CNC machining and a seal ring engaged with the water guide unit. The pump body is a simple basin shape which can be produced with less stress concentration. The water guide unit may be made with a more precise volute for achieving better pumping efficiency. The reinforced member may increase structural strength of the pump casing for withstanding greater pumping pressure and external forces. The seal ring may be positioned precisely without dislocation because it engages with the water guide unit rather than the pump casing. The gap between the seal ring and the impeller may be kept small and constant, thus obtaining better pumping efficiency, lower operation noise and greater durability.

Abstract: An ultra-thin low noise axial flow fan is provided for office automation machine. The center line along the blade from its root portion to its tip portion is circular arc form and it is perpendicular to the central hub. The leading edge skew angle at the tip portion of the blade is 47 degrees. The blade angle of each blade ranges from 57 to 63 degrees, which is first directly proportional to the radius of the blade and then inversely proportional to the radius of the blade from the root portion to the tip portion of the blade. The pitch-chord ratio of each blade is inversely proportional to the radius of the blade from the root port to the tip portion of the blade. The blade of the fan thereby generates high air flow and high pressure, and has advantages of low noise and ultra-thin outer casing.