Patent ID: 9408990
Filing Date: 2016-08-09
CPC Classification: A61M,B01F,F16K,G05D

Claim Text:
1. An oxygen mixing valve, comprising a valve body having an oxygen inlet, an air inlet and a mixed-gas outlet, a mixing cavity in communication with the mixed-gas outlet, an oxygen cavity in communication with the oxygen inlet, and an air cavity in communication with the air inlet being arranged in the valve body, wherein, a first guide holder is arranged in the oxygen cavity, a second guide holder is arranged in the air cavity, a first ball and a second ball which are connected with a ball driving stem are respectively arranged on an inner sides of the first guide holder and an inner side of the second guide holder, a driving stem is arranged movably on an outer side of the first guide holder, a rotatable bearing is arranged on an outer end of the driving stem, and an involute cam connected with an output shaft of a step motor is arranged on an outer end of the bearing, wherein the inner side of the first guide holder is a concave side of the first guide holder, the outer side of the first guide holder is a side opposite to the concave side of the first guide holder, the inner side of the second guide holder is a concave side of the second guide holder, the outer side of the second guide holder is a side opposite to the concave side of the second guide holder, and the outer end of the driving stem is an end closer to the mixing cavity than an inner end of the driving stem, and wherein, the valve body includes a first valve body, a second valve body and a third valve body arranged successively, the mixing cavity containing a first valve core body and a second valve core body is arranged in the second valve body, the first valve core body and the second valve core body are connected to communicate with each other and form an air cavity interiorly, the oxygen cavity is arranged in the first valve body, the air cavity is in communication with the mixing cavity through an air outlet arranged on the first valve core body, and the oxygen cavity is in communication with the mixing cavity through an oxygen outlet arranged on the second valve body.