Automatic chemical injection device

Abstract

Abstract PURPOSE:To improve injection efficiency by providing a flow meter, a pair of two-way valves, a control means, a feed pipe, and a pressure drive quantitative pump, and providing a constitution of injecting a chemical into a feed main pipe followed by spraying. CONSTITUTION:When the flow rate of a feed main pipe 8 is reached to a preliminarily set flow rate integrating value, a flowmeter 1 transmits a detection signal to a control means 4. The control means 4 transmits a control signal for opening a first two-way solenoid valve 2 to the valve 2, whereby discharge stroke is started. In the discharge stroke, the valve 2 is opened, and a pressure fluid such as water or air is sent into a pressure drive quantitative pump 6, and a chemical is injected into the feed main pipe 8 through a feed pipe 5. When the discharge stroke is terminated, the control means 4 transmits a control signal for closing the valve 2 to the valve 2, whereby suction stroke is started. In the suction stroke, the valve 2 is closed, and the pressure added to the pump 6 is released. In this case, as a second two-way valve 3 is in the opened state, the pressure fluid is exhausted to the outside, and the chemical is sucked into the pump 6. The time ratio of both the strokes is set in the means 4.

Inventors

• 👤 Tatsuo Akamatsu
• 👤 赤松　達雄
• 👤 Hiroshi Yamashita
• 👤 山下　広
• 👤 Masaru Suematsu
• 👤 優 末松
• 👤 Mamoru Yoneda
• 👤 米田　護

Bibliographic Details