Pressing die and pressing method for vinylidene fluoride impeller with movable ring

Abstract

The invention belongs to the technical field of water pumps, and discloses a pressing die and a pressing method for a vinylidene fluoride impeller with a movable ring. The invention aims to solve theproblem in the production of the vinylidene fluoride impeller with the movable ring in the prior art. The pressing die comprises a bottom die, a core rod, impeller plug sheets, a material barrel, an upper die and the like. The pressing method comprises the following steps that a feeding tray is selected, vinylidene fluoride granules are added into the feeding tray for heating, the die is processedand assembled, the impeller movable ring sleeves the core rod of the die, and by the steps of heating the die and adding materials and pressing and the like, the vinylidene fluoride impeller with themovable ring is produced. The pressing die is suitable for single-piece small-batch production, the die investment is small, the cost is low, and the problem that the vinylidene fluoride production cost is high is effectively solved. According to the pressing die, the impeller movable ring and the impeller are formed in one step, additional bonding is not needed, and the reliability of the movable ring is improved, the time is saved, and the productivity is improved. The pressing die has the advantages that the production method is simple, and the popularization of the vinylidene fluoride impeller is facilitated.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a pressing mold and a pressing method of a partial difluoride impeller with a drive ring. Background technique [0002] Polyvinylidene fluoride (polyvinylidene fluoride PVDF) has the highest strength in the fluoroplastic series, except for fuming concentrated sulfuric acid, concentrated hot sulfuric acid and nitric acid, ketones, esters, amines and high-temperature sulfonating agents above 90 °C. In addition to corrosion resistance, other media can withstand it, so in the corrosion-resistant fixed-axis magnetic pump, the material used as the flow-passing part is widely used. The fixed-axis magnetic pump has a simple structure, and it is supported on the inlet and tail of the pump. On the isolation sleeve, the plastic lining layer is required to have sufficient strength, because the impeller is in the form of all plastic, in order to ensure the strength, the partial difluoride...

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Problems solved by technology

[0002] Polyvinylidene fluoride (polyvinylidene fluoride PVDF) has the highest strength in the fluoroplastic series, except for fuming concentrated sulfuric acid, concentrated hot sulfuric acid and nitric acid, ketones, esters, amines and high-temperature sulfonating agents above 90 °C. In addition to corrosion resistance, other media can withstand it, so in the corrosion-resistant fixed-axis magnetic pump, the material used as the flow-passing part is widely used. The fixed-axis magnetic pump has a simple structure, and it is supported on the inlet and tail of the pump. On the isolation sleeve, the plastic lining layer is required to have sufficient strength, because the impeller is in the form of all plastic, in order to ensure the strength, the partial difluoride material is the first choice, but the partial difluoride material is relatively brittle, sensitive to temperature, large shrinkage, and serious deformation , It is difficult to demould, easy to crack, and it is difficult to produce by pressing, especially for pressing impellers, the yield is very low, because the flow rate of general corrosion-resistant fixed-axis magnetic pumps is relatively small, and the width of the impeller outlet is between 5-13mm In such a small gap, it is difficult to form such a small gap at one time, so most of them are produced by injection molding. The injection molding process is suitable for mass production, and the investment cost of the mold is very high, and the moving ring of the impeller cannot be formed on the impeller at one time, but twice. Bonding, the moving ring is easy to fall off, and the quality is unstable

Therefore, the prior art cannot solve the above-mentioned problems, and the prior art cannot provide a one-time molded partial difluoride impeller with a driving ring.

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