Air pump with secondary air inlet

Details Air pump with secondary air inlet Air pump with secondary air inlet

1990-02-21

1991-02-05

Koczo, Michael

Pumps

One fluid pumped by contact or entrainment with another

Jet pump with motive fluid generating pump

417 87, 417182, F04B 2308

Patent

active

049900609

ABSTRACT:
An air pump for inflating an inflatable article includes a multi-stage centrifugal compressing section for inhaling and compressing primary air and a secondary air inhaling mechanism provided downstream of the multi-stage centrifugal compressing section. At the beginning of the inflation operation, extra secondary air can be rapidly inhaled into the air pump and delivered into the inflatable article mainly by means of the secondary air inhaling mechanism and thereafter, when the inner pressure of the inflatable article gradually increases to exceed the predetermined level, the secondary air inhaling mechanism may be closed so that only the multi-stage centrifugal compressing section for primary air functions to continue the subsequent inflation operation in a higher pressure range. Thus, an ideal and speedy inflation operation may be achieved without reducing the inflation pressure.

REFERENCES:
patent: Re27860 (1974-01-01), Day
patent: 2598884 (1952-06-01), Brady, Jr.
patent: 3591314 (1971-07-01), Day
patent: 4513784 (1985-04-01), Farrand et al.
patent: 4805661 (1989-02-01), Knapp et al.
patent: 4818389 (1989-04-01), Tobias et al.
patent: 4880358 (1989-11-01), Lasto

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