Foam Pump

Abstract

A foam pump, comprising a pump body (1), a big cover (2), a big piston (3), a small piston (4), a piston rod (5), a head cap (6) and a foam screen (7), featured by that: said pump body (1) is at the upper part, said big cover (2) is at the lower part, said pump body (1) being integrated with said big cover (2), said head cap (6) being integrated with the lower big piston (3); a sealing ring (9) of elastic materials being provided between said big piston (3) and the inner wall of said pump body (1) for tight engagement, which forms an one-way valve structure, which makes the pump body and the big cover integrated, thus the air cavity can be enlarged, the working pressure of the foam pump can be improved with the big cover of the same size, and the foaming effect of the foam pump can be enhanced; said head cap being integrated with said big piston, a sealing ring is provided between said big piston and the inside wall of the pump body, which simplifies the structure of the big piston and makes the internal structure of the foam pump more compact.

Description

CROSS REFERENCE TO THE RELATED PATENT APPLICATION[0001]The present application claims the priority of the Chinese patent application No. 200820167006.8, which application is incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to a kind of foam pump.BACKGROUND OF THE INVENTION[0003]Existing foam pumps have large screw bases and sizes, for instance, the Chinese patent of the applicant under the publication number of CN 201073625 (patent number: CN200720113219.8) authorized on Jun. 18, 2008 disclosed a kind of foam pump comprising the pump body, the big piston, the big piston rod, the small piston, the small piston rod, the head cap and the foam screen featured by that an one-way valve connected with the air cavity in the big piston is provided in said big piston rod, the main body of said one-way valve adopts sleeve-shaped valve leaves made of elastic material which are provided with staged surfaces for installation on the fixing base of said big piston...

AI Technical Summary

Benefits of technology

[0004]The technical issue for this invention to solve is to provide a kind of foam pump with more compact and reasonable structure and better foaming effect while maintaining the advantage of fine one-way air inlet effect.

[0006]As a further improvement, said big cover is provided with an air hole for connection with the outside, said air hole being connected with the outside via an one-way valve inside said big cover, which facilitates the air to enter the atomizer connected with the thread of the big cover to extrude the liquid and improve the foaming effect.

[0007]Said one-way valve adopts the tight engagement of elastic valve and air holes, which is a simple structure.

[0009]As a further improvement, a circular groove is formed on the lower part of said pump body, said piston rod is provided with a shoulder, said piston rod is sleeved with a spring, which is supported between said circular groove and said shoulder, which effectively separates said spring from the liquid and prevents the liquid from secondary contamination and thus keeps the product more hygienic.

[0011]Compared with existing technologies, this invention has the advantages as follows: makes the pump body and the big cover integrated, thus the air cavity can be enlarged, the working pressure of the foam pump can be improved with the big cover of the same size, and the foaming effect of the foam pump can be enhanced; it further integrates the head cap with said big piston, providing sealing ring out of elastic material between the big piston and the pump body, which simplifies the structure of the big piston, in the meanwhile, the pump body itself is used as the piston cavity case of the big piston, there's no need to provide separate piston cavity case, which further simplified the structure of the foam pump and makes the internal structure of the foam pump more compact.

Problems solved by technology

Foam pump of this structure adopts separated cap and bump body, thus the screw base cannot be too small, leading to large size of the pump.

More over, the spring is provided outside of the small piston rod and inside the big piston rod, which makes the spring subject to contact with the liquid, which increases the possibility of secondary contamination of the liquid.

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