Foam pump

Abstract

A foam pump comprises a pump body, a large cover, a head cap and a foaming assembly. The inner portion of the pump body is divided into an upper layer space and a lower layer space through a partition plate. An upper main rod and a lower main rod are arranged in the upper layer space and the lower layer space respectively. The lower end of the upper main rod penetrates through the partition plate to be axially arranged on the upper portion of the lower main rod in a sleeving mode. The upper end of the upper main rod is connected with the head cap. The lower end of the lower main rod is connected with a blocking plug arranged on the lower portion of the pump body. Disc-shaped structures used in cooperation with the inner wall of the pump body for serving as a piston are integrally formed on the upper portion of the upper main rod and the upper portion of the lower main rod respectively. A first check valve and a third check valve are arranged below the disc-shaped structures respectively. A second check valve and a fourth check valve corresponding to gas outlets are arranged on the inner wall of the upper main rod and the inner wall of the lower main rod respectively. A double-layer structure is adopted for the pump body, the double gas amount can be achieved through the single pressing distance on the premise that the external diameter and the dosage of the pump body are not changed, and therefore the double dosage is achieved, and the foam pump has the advantages of being compact and reasonable in structure, good in sealing performance and large in dosage.

Description

technical field [0001] The invention relates to a foam pump, especially a large dose foam pump. Background technique [0002] Foam pumps are widely used in daily cosmetics, pharmaceuticals and other fields. Generally, the dosage of foam pumps is relatively small, and they all adopt the structure of a single-layer pump body. However, there are also occasions where a large dosage is required. Assuming that the outer diameter of the pump remains unchanged Under the circumstances, to increase the dose, the pressing stroke and the height of the pump body must be increased, so that the height of the head cap will be very high, which will affect the use and appearance. [0003] After investigation, the existing Chinese patent No. 200720113219.8 "A Foam Pump" includes a pump body, a large piston, a large piston rod, a small piston, a small piston rod, a head cap, and a foaming net. The above-mentioned large piston rod is provided with a one-way valve connected with the gas cavity o...

AI Technical Summary

Problems solved by technology

[0002] Foam pumps are widely used in daily cosmetics, pharmaceuticals and other fields. Generally, the dosage of foam pumps is relatively small, and they all adopt the structure of a single-layer pump body. However, there are also occasions where a large dosage is required. Assuming that the outer diameter of the pump remains unchanged In order to increase the dose, it is necessary to increase the pressing stroke and the height of the pump body, so that the height of the head cap will be very high, which will affect the use and appearance

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