Plastic pump, and method for manufacturing same

Abstract

The present invention relates to a plastic pump and to a method for manufacturing same. The method includes: a pre-manufacturing step for pre-manufacturing an inner body and impeller formed from a fluorine resin material by means of injection molding; a body manufacturing step for manufacturing a complete body, in which the inner body is formed from a fluorine resin and the outer body is formed from a plastic material, by molding the plastic material in a first mold after fixing the pre-manufactured inner body to the first mold; a cover manufacturing step for manufacturing an impeller cover, which is formed from a plastic material, by molding the plastic material in a second mold so as to protect the manufactured impeller; and a finishing step for completing the plastic pump by sequentially assembling the manufactured complete body, the impeller, and the impeller cover. According to the present invention, only a fluid transporting path is lined with the fluorine resin and is thus not easily deformed by temperature regardless of the type of fluid and is resistant to a chemical reaction with a fluid for improved product quality and significant extension of the period over which the pump can be used.

1 . A method for manufacturing a plastic pump, comprising:
 a pre manufacturing step wherein an inner body made of a fluorine resin material and forming a fluid transporting path and an impeller engaged to the inner body are previously manufactured through an injection mold method;   a body manufacturing step wherein for manufacturing a complete body, in which the inner body is formed from a fluorine resin and the outer body is formed from a plastic material, by molding the plastic material in a first mold after fixing the pre-manufactured inner body to the first mold;   a cover manufacturing step wherein for manufacturing impeller cover, which is formed a plastic material, by molding the plastic material in a second mold so as to protect the manufactured impeller; and   a finishing step wherein for completing a plastic pump by sequentially assembling the manufactured complete body, the impeller and the impeller cover.   
     
     
         2 . The method of  claim 1 , wherein the fluorine resin is formed of PFA or PVDF, and the plastic material is formed of PP, PVC or PPS. 
     
     
         3 . The method of  claim 2 , wherein during the injection mold method with respect to the inner body and the impeller, a PFA, which is a fluorine resin material is injected in the injection mold at a pressure of 35˜80 kgf/cm2. 
     
     
         4 . The method of  claim 3 , wherein the PFA, which is the fluorine resin material, has a temperature of  270 ° C.˜ 420 ° C. 
     
     
         5 . The method of  claim 2 , wherein the PVDF, which is the fluorine resin material, has a temperature of 170° C.˜235° C. 
     
     
         6 . The method of  claim 2 , wherein when mold-injecting the plastic material in the first mold, the injection is performed at a pressure of 35˜80 kgf/cm2. 
     
     
         7 . The method of  claim 2 , wherein the inner body formed of the fluorine resin material has a thickness of 1˜10 mm. 
     
     
         8 . A plastic pump which is manufactured by a manufacturing method of  claim 1 . 
     
     
         9 . A plastic pump which is manufactured by a manufacturing method of  claim 2 . 
     
     
         10 . A plastic pump which is manufactured by a manufacturing method of  claim 3 . 
     
     
         11 . A plastic pump which is manufactured by a manufacturing method of  claim 4 . 
     
     
         12 . A plastic pump which is manufactured by a manufacturing method of  claim 5 . 
     
     
         13 . A plastic pump which is manufactured by a manufacturing method of  claim 6 . 
     
     
         14 . A plastic pump which is manufactured by a manufacturing method of  claim 7 .