BE528254A

BE528254A -

Info

Publication number: BE528254A
Authority: BE

Description

       

  



     4)   Turbine suivant les revendications 2 et 3 caractérisée en ce que la bague est conçue et calculée de façon ; a) à assurer un entraînement et un calage parfaits de la turbine b) à éviter les soufflures qui existent dans une pièce injectée 

**ATTENTION** fin du champ DESC peut contenir debut de CLMS **. en polyamide quand les épaisseurs ne sont pas bien réparties ; c) à obtenir un retrait normal après injection.



  



     4) Turbine according to claims 2 and 3 characterized in that the ring is designed and calculated so; a) ensure perfect drive and timing of the turbine b) avoid blowholes that exist in an injected part

** ATTENTION ** end of DESC field can contain start of CLMS **. in polyamide when the thicknesses are not well distributed; c) achieve normal withdrawal after injection.

Claims

The present invention relates to centrifugal turbines and in particular to those used in pumps, more particularly, household electric pumps.

Its purpose is to allow and facilitate the use of synthetic materials such as polyamides (nylon) for the production of the turbine wheel.

The excellent technical properties of these substances are now well known and find a particularly advantageous use in the case of the invention.

According to the invention, a ring usually made of metal is crimped onto the shaft, comprising a groove and an external knurling making it possible to hold the wheel in place and to drive it.

In the practical embodiment of the invention, an internal groove is located between two externally knurled parts.

In order to make the invention fully understood, an example of application thereof will be described below with reference to the accompanying drawings.

In the accompanying drawings and more particularly in Figure 1, there is shown at 1 the shaft of the turbine on which is crimped a metal ring 2 comprising an internal groove 3 between two parts 4 whose periphery is knurled.

Figure 2 shows the turbine 5 obtained by the injection operation and located around the ring 2.

As can easily be seen, the ring 2 allows the wheel 5 to be held in place and to be driven.

Ring 2 has been designed and calculated in such a way as to: a) obtain perfect drive and timing of the turbine; b) to avoid the blowholes which exist in a part injected in polyamide when the thicknesses are not well distributed. These blowholes make the part fragile. c) to obtain a normal shrinkage after injection, shrinkage which must be regular to obtain a calibrated part coming out of the mold so as to reduce the finishing.

CLAIMS 1) Process for the manufacture of turbine rotors, in particular for centrifugal pumps, characterized in that the rotor is obtained by injection from polyamides or other similar synthetic materials and in that, for this purpose, the shaft is crimped a ring usually made of metal having a groove and an external knurling making it possible to maintain the. wheel in place and drive it.

2) Turbine in particular for a centrifugal pump obtained by the method according to claim 1, characterized in that the rotor is made of a polyamide (nylon for example) and in that on the shaft is crimped a ring usually made of metal having an internal groove and an outer knurling.

3) Turbine according to claim 2 characterized in that the inner groove is located between two externally knurled parts. ** CAUTION ** end of field CLMS may contain start of DESC **.