Plastic pump, and method for manufacturing same

Abstract

A plastic pump comprises a complete body having an inner body made of a fluorine resin and an outer body made of a plastic material by molding the plastic material in a first mold after fixing a pre-manufactured inner body to the first mold, an impeller made of a fluorine resin material by means of injection molding, and an impeller cover made of a plastic material by molding the plastic material in a second mold to protect the impeller, and a fluid transporting path is lined with the fluorine resin of the inner body.

Claims

1. A plastic pump, comprising: a complete body having an inner body made of a fluorine resin material and an outer body made of a first plastic material by injecting the first plastic material in a first mold after fixing the inner body to the first mold; an impeller made of a fluorine resin material by an injection mold; an impeller cover made of a second plastic material by molding the second plastic material in a second mold, wherein a fluid transporting path is formed through the inner body consisting of the fluorine resin material and the outer body, the inner body and the outer body are integrally formed by the injecting the first plastic material, and extra assembling process of the inner body and the outer body is not necessary.

2. The plastic pump of claim 1, wherein the fluorine resin material of the inner body is different from the first plastic material of the outer body.

3. The plastic pump of claim 2, wherein the fluorine resin material of the inner body is PFA or PVDF, and the first plastic material of the outer body is PP, PVC or PPS.

4. The plastic pump of claim 3, wherein the PFA, which is the fluorine resin material of the inner body, has a melting temperature of 270° C. to 420° C.

5. The plastic pump of claim 3, wherein the PVDF, which is the fluorine resin material of the inner body, has a melting temperature of 170° C. to 235° C.

6. The plastic pump of claim 1, wherein the fluorine resin material of the impeller is different from the first plastic material of the outer body.

7. The plastic pump of claim 1, wherein the inner body made of the fluorine resin material has a thickness of 1to 10 mm.

8. The plastic pump of claim 1, wherein the plastic pump is completed by sequentially assembling the complete body, the impeller and the impeller cover.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic view illustrating a configuration of a plastic pump to an exemplary embodiment of the present invention may apply.

(2) FIG. 2 is a step view for describing a manufacturing procedure of a plastic pump according to the present invention.

(3) FIG. 3 is a view illustrating an inner body formed of a fluorine resin according to an exemplary embodiment of the present invention.

(4) FIG. 4 is an example view illustrating an outer body made by injecting a plastic material in a first mold according to an exemplary embodiment of the present invention.

(5) FIG. 5 is an example view illustrating a plastic pump assembled in a finishing step according to an exemplary embodiment of the present invention.

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

(6) 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.

(7) Hereinafter, the manufacturing procedures according to an exemplary embodiment of the present invention will be described in details with reference to FIGS. 1 to 5.

(8) FIG. 1 is a schematic view illustrating a configuration of a plastic pump to an exemplary embodiment of the present invention may apply. FIG. 2 is a step view for describing a manufacturing procedure of a plastic pump according to the present invention. FIG. 3 is a view illustrating an inner body formed of a fluorine resin according to an exemplary embodiment of the present invention. FIG. 4 is an example view illustrating an outer body made by injecting a plastic material in a first mold according to an exemplary embodiment of the present invention. FIG. 5 is an example view illustrating a plastic pump assembled in a finishing step according to an exemplary embodiment of the present invention.

(9) Referring to FIGS. 1 and 2, the plastic pump 10 according to the present invention may include, but is not limited to, an inner body 20, an outer body 30, an impeller 40 and an impeller cover 50.

(10) 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/cm.sup.2 in the injection mold.

(11) 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 consisting 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 FIG. 3. In the inner body 20, a fluid transporting path 20a is formed of a fluorine resin. For this, even if chemical liquid flows through the fluid transporting path 20a, the inner surface of the inner body 20, namely, the inner surface of the fluid transporting path 20a does not go corroded and is chemically safe, thus improving the quality of the product.

(12) 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, wherein the inner body 20 consists of a fluorine resin, and the outer body 30 consists 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/cm.sup.2.

(13) In case where the inner body 20 is formed of PFA, the outer body 30 may be formed of PP, PVC or PPS, but in case where the inner body 20 is formed of PVDF, it is preferred that the outer body 30 is formed of PP or PVC.

(14) 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 consisting of a plastic material (S400).

(15) 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).

(16) 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.

(17) 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.