Diaphragm of diaphragm pump and molding technique thereof

Abstract

The invention relates to a membrane pump diaphragm which comprises a diaphragm body assembled between a fluid chamber bracket and a diaphragm chamber, one surface of the diaphragm body matched with a fluid chamber is a hard modified PP layer, a hard modified PE layer, a hard modified PVC layer or a hard modified PA layer which can satisfy the pressure strength requirements; and the other surface of the diaphragm body matched with the fluid chamber is a soft modified PP layer, a soft modified PE layer, a soft modified PVC layer or a rubber layer which can satisfy the sealability requirements. A molding process of the membrane pump diaphragm comprising the following steps that a first-layer diaphragm is made by adopting a way of injection molding or compression molding and a second-layer diaphragm is made by adopting a way of injection molding; three lug bosses on the back surface of the first diaphragm align to and are blocked into three concave tables on the front surface of the second-layer diaphragm; or hard modified PP materials or hard modified PVC materials are made into the second-layer diaphragm by adopting the way of injection molding, and then, the second-layer diaphragm is put into a second die as an inserted member, and the first-layer diaphragm which can satisfy the sealability requirements is made by adopting the way of injection molding.

Description

technical field [0001] The invention relates to the technical field of a diaphragm pump used in a pure water machine, in particular to a diaphragm of a diaphragm pump and a forming process thereof. Background technique [0002] The current commercial water purifiers are usually equipped with a large flow diaphragm pump; because the flow rate of commercial water purifiers is much higher than that of household water purifiers, the average daily running time is also longer. Therefore, the safety and actual operating life of commercial water purifiers have also doubled, so there are higher requirements for the diaphragm pump, which is an important core part of the pure water machine, mainly reflected in the tightness of the diaphragm pump. And there are higher requirements on service life. figure 1 It is a cross-sectional view of a diaphragm pump used in a reverse osmosis water purification system, wherein: the diaphragm pump A includes a piston 1, and the balance wheel assembl...

AI Technical Summary

Problems solved by technology

At present, the diaphragms of diaphragm pumps on the market are all made of homogeneous rubber or rubber-plastic materials. Obviously, the diaphragms of homogeneous materials cannot meet the above contradictory requirements at the same time.

like figure 2 As shown in , since the tightness of the diaphragm pump is guaranteed by the elasticity of the diaphragm, it is required that the Shore hardness of the diaphragm should not be too high, and the diaphragm will become as shown in the figure when it is subjected to water pressure for a long time during operation. The deformation shown in this way will form a sharp point 4b under the section, so it is easy to form a fracture here, which will lead to serious defects such as water leakage and pressure loss in the diaphragm pump

Generally, increasing the Shore hardness of the diaphragm can avoid serious deformation of the diaphragm under water pressure, but the elasticity of the diaphragm will decrease, which will cause poor sealing and reduce the folding resistance of the diaphragm.

Therefore, the current diaphragm pumps often have poor sealing, diaphragm fatigue fracture, severe diaphragm bending and deformation leading to rupture, etc. The main reason is that the structure of the diaphragm is unreasonable.

Images