Liquid pump provided with elastic stretching reset device

Abstract

A liquid pump comprises a fixed unit fixed relative to a container, and a movable unit reciprocating relative to the fixed unit; a liquid product is pumped out of the container via the reciprocating motion; the reciprocating motion is jointly achieved by a pressing force applied to the movable unit by a user to move the movable unit relative to the fixed unit and an elastic resetting device (10) enabling the movable unit to reset relative to the fixed unit after the pressing force is removed; the elastic resetting device (10) comprises an elastic stretching device (10) between the fixed unit and the movable unit; the elastic stretching device (10) is at least partially made from an elastic material. The liquid pump reduces production cost, avoids metal oxide pollution, facilitates recycling, and can effectively ensure the resetting force to achieve the required liquid pump distribution amount without worsening the hand-pressing feel of the liquid pump.

Description

technical field [0001] The invention relates to the field of liquid pumps, in particular to a liquid pump with an elastic return device. Background technique [0002] The liquid pump is generally installed at the opening of the container, and is used for pumping and distributing the liquid product in the container out of the container through a manual pressing operation by a user for use. This type of liquid pump usually has an elastic reset device, which is used to return the pump head to its original position after the user removes the downward pressure on the pump head, and at the same time, the liquid product in the container is sucked during the reset process of the pump head. into the reservoir of the liquid pump for the next pump pressure dispense. There are mainly two types of liquid pumps with elastic return devices on the market: one is to use a metal compression spring 200, see for example figure 1 As shown (the structure disclosed in WO9740945), the metal compr...

AI Technical Summary

Problems solved by technology

[0003] For liquid pumps using metal compression springs, the metal material increases the cost

Moreover, the metal spring is easy to oxidize and rust, and the metal oxide will contaminate the liquid product in the container

In addition, in terms of product recycling, the waste liquid pump needs to be disassembled to recover metal springs and other plastic parts separately, which increases the cost of recycling

[0004] For liquid pumps using elastomer bellows, although they use elastomer bellows instead of metal compression springs to solve the problems of high cost of metal springs, easy contamination of liquid products, and inconvenient recycling, they also have their defects. The biggest The problem is the lack of responsiveness

For relatively viscous liquid products to be dispensed and liquid pumps with large dispense volumes, this kind of elastomer bellows is difficult to meet the requirements

In order to increase the rebound force, relatively hard materials have been used to make the bellows in the prior art, but this will significantly increase the user's downforce on the liquid pump head, thus deteriorating the user's hand comfort

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