Patent Application
20150354580
The present invention relates to a plastic pump, and a method for manufacturing the same, and in particular to a plastic pump, and a method for manufacturing the same wherein a fluid transporting path of the inside of a plastic pump is lined with a fluorine resin, so the plastic pump will not be easily deformed by temperature based on the kinds of fluids, and the plastic pump is strong to any chemical reaction with fluid.
In recent years, a plastic pump the weight of which is lighter than a steel product is being used more and more thanks to the benefits resulting from is the decreased weight of the pump. In such a plastic pump, since a pump itself is made of a plastic material (PP, GFFRP), a fluid transporting path formed in the inside is also made of only a plastic material.
If the fluid transporting path is made of only a plastic material, the inside of the fluid transporting path may be easily deformed by the temperature based on the kinds (characteristics) of the fluid flowing through the fluid transporting path or may have a problem due to a chemical reaction with the fluid. In order to prevent such a problem, the whole materials of the plastic pump may be made of a fluorine material, but in this case the manufacturing costs a lot.
Accordingly, the present invention is made in an effort to resolve the above problems. It is an object of the present invention to provide a plastic pump and a method for manufacturing the same wherein only the fluid transporting path formed inside the plastic pump is lined with a fluorine resin, so the plastic pump is not easily deformed by temperature irrespective of the kinds of the fluids, and the plastic pump is strong to any chemical reaction with fluid.
To achieve the above objects, there is provided a method for manufacturing a plastic pump, which may include, but is not limited to 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.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, the fluorine resin is formed of PFA or PVDF, and the plastic material is formed of PP, PVC or PPS.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, 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 is 35˜80 kgf/cm2.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, the PFA, which is the fluorine resin material, has a temperature of 270° C.˜420° C.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, the PVDF, which is the fluorine resin material, has a temperature of 170° C.˜235° C.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, when mold-injecting the plastic material in the first mold, the injection is performed at a pressure of 35˜80 kgf/cm2.
In addition, according to the method for manufacturing a plastic pump according to an exemplary embodiment of the present invention, the inner body formed of the fluorine resin(PFA or PVDF) material has a thickness of 1˜10 mm.
In addition, the present invention is directed to a plastic pump which is manufactured by the above method for manufacturing a plastic pump.
In the plastic pump manufactured according to the plastic pump and is the method for manufacturing the same according to the present invention, only the fluid transporting path is lined with a fluorine resin, so the plastic pump is not easily deformed by temperature regardless of the type of the fluids, 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.
The most preferred embodiments of the present invention will be described with reference to the accompanying drawings to the extent that a person having ordinary skill in the art can easily implement. Throughout the description of the present invention, the same components will be given the same reference numbers, and duplicating descriptions may be omitted.
Hereinafter, the manufacturing procedures according to an exemplary embodiment of the present invention will be described in details with reference to
Referring to
The inner body 20 and the impeller 40 are previously made of a fluorine resin (PFA or PVDF) material through an injection mold method (S100). When the inner body 20 and the impeller 40 are made by the injection mold method, the PFA (PVDF), which is a fluorine resin material, is injected at a pressure of 35˜80 kgf/cm2 in the injection mold.
At this time, the PFA, which is a fluorine resin material, has a temperature of 270° C.˜420° C., and the PVDF, which is a fluorine resin material, has a temperature of 170° C.˜235° C. In addition, it is preferred that the inner body 20 made of a fluorine resin (PFA or PVDF) material has a thickness of 1˜10 mm. An example of the configuration of the inner body 20 is illustrated in
Thereafter, the inner body 20 previously manufactured in the step S100 is fixed at a first mold (not illustrated) (S200), and a plastic material (PP or PVC or PPS) is injected in the first mold, so the complete body is manufactured, is wherein the inner body 20 is made of a fluorine resin, and the outer body 30 is made of a plastic material (S300). During the injection mold, the plastic material is injected in the first mold at a pressure of 35˜80 kgf/cm2.
In case where the inner body 20 is made of PFA, the outer body 30 may be formed of PP, PVC or PPS, but in case where the inner body 20 is made of PVDF, it is preferred that the outer body 30 is formed of PP or PVC.
In order to protect the manufactured impeller 40, the plastic material (PP or PVC or PPS) is injected in the second mold (not illustrated), thus manufacturing an impeller cover 50 made of a plastic material (S400).
Thereafter, the manufactured whole bodies 20 and 30, the impeller 40 and the impeller cover 50 are sequentially assembled, and the plastic pump 10 is finished (S500).
At this time, since the injection is performed in the inner body 20, and then the outer body 30 is manufactured, the procedure for assembling the inner body and the outer body can be omitted in the following procedure.
The present invention made by the inventor has been described so far in details based on the exemplary embodiments, but the present invention is not limited thereto. Various modifications are available without departing from the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2013-0001433 | Jan 2013 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2013/011745 | 12/17/2013 | WO | 00 |
