US 12,228,304 B2
Air volume control valve capable of accurately measuring air volume
Lin Dong, Beijing (CN); Ning Sun, Beijing (CN); and Xiangfang Li, Beijing (CN)
Filed by TONGZHOU LANHAI (BEIJING) HOLDING CO., LTD, Beijing (CN)
Filed on Sep. 24, 2024, as Appl. No. 18/894,072.
Application 18/894,072 is a continuation of application No. PCT/CN2023/084095, filed on Mar. 27, 2023.
Claims priority of application No. 202210346151.7 (CN), filed on Mar. 31, 2022.
Prior Publication US 2025/0012475 A1, Jan. 9, 2025
Int. Cl. F24F 11/75 (2018.01); F24F 11/89 (2018.01); F24F 110/40 (2018.01); G01F 1/42 (2006.01)
CPC F24F 11/75 (2018.01) [F24F 11/89 (2018.01); G01F 1/42 (2013.01); F24F 2110/40 (2018.01)] 10 Claims
OG exemplary drawing
 
1. An air volume control valve capable of accurately measuring an air volume, comprising a round-shaped valve body, and a valve blade and an orifice plate provided in the round-shaped valve body, wherein
the orifice plate is located upstream of the valve blade; an upstream pressure tapping port and a downstream pressure tapping port are respectively provided upstream and downstream of the orifice plate; a distance from both the upstream pressure tapping port and the downstream pressure tapping port to the orifice plate is 0.5 times a valve diameter of the round-shaped valve body; and the valve blade is located downstream of the downstream pressure tapping port; and
an inlet side of the round-shaped valve body is provided with a convergent duct fitting; and the convergent duct fitting is located at a distance of one times the valve diameter upstream of the orifice plate and is tapered along an air flow direction;
wherein the orifice plate is provided with a circular inner hole; and the circular inner hole has a diameter that is 0.2-0.8 times the valve diameter;
wherein the round-shaped valve body is divided into an air volume measurement section and an air volume regulation section; the air volume measurement section is centered on the orifice plate and has a length that is twice the valve diameter; and the air volume regulation section is centered on a shaft of the valve blade.