The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2025
Filed:
Nov. 11, 2021
Tyco Fire Products Lp, Cranston, RI (US);
Jun Xu, Shanghai, CN;
Shijie Tu, Shanghai, CN;
Dong Han, Shanghai, CN;
Zhengxi Ju, Shanghai, CN;
Jinyu Ran, Shanghai, CN;
Chengyu Wang, Shanghai, CN;
Tyco Fire Products LP, Cranston, RI (US);
Abstract
A foam proportional mixing device includes a Roots pump and a gear pump. The Roots pump comprises a Roots pump inlet, a pair of rotors and a fluid guide member. The fluid guide member is arranged in the Roots pump inlet, and is configured to guide fluid to flow to the pair of rotors and provide driving forces to the pair of rotors for rotating same in opposite directions from each other. The gear pump includes a pair of gears. The foam proportional mixing device includes a rotor shaft of one rotor in the pair of rotors of the Roots pump is connected to a gear shaft of one gear in the pair of gears of the gear pump, such that the one rotor drives the one gear to rotate.