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A Karman vortex flowmeter for producing a Karman vortex street corresponding to the velocity of a fluid and measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street to cause vibration of a vibrating plate portion of a m

A Karman vortex flowmeter for producing a Karman vortex street corresponding to the velocity of a fluid and measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street to cause vibration of a vibrating plate portion of a metal sheet member consisting of a magnetic substance and having first and second magnetic circuit-forming portions to produce a magnetic circuit whose magnetic flux reverses in direction whenever the direction of the vibration of the vibrating plate portion is reversed. Magnets are disposed to magnetize the ends of the vibrating plate portion to different polarities according to the direction of the vibration of the vibrating plate portion and a detecting means detects the inversion of the direction of the magnetic flux caused by the formation of the magnetic circuit and the frequency of flux inversion is used to determine the flow rate of the fluid.

대표청구항 ▼

A Karman vortex flowmeter for producing a Karman vortex street corresponding to the velocity of a fluid on the downstream side of a column inserted in the fluid to produce the vortex street and for measuring the flow rate of the fluid by making use of the variations in the pressure caused by the pro

A Karman vortex flowmeter for producing a Karman vortex street corresponding to the velocity of a fluid on the downstream side of a column inserted in the fluid to produce the vortex street and for measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street, said flowmeter comprising: a metal sheet member consisting of a magnetic substance and containing a vibrating plate portion which vibrates in response to the variations in the pressure, the sheet member having first and second magnetic circuit-forming portions to produce a magnetic circuit whose magnetic flux reverses in direction whenever the direction of the vibration of the vibrating plate portion is reversed; pressure transfer means for transmitting the variations in the pressure in the column to the vibrating plate portion; magnets disposed to magnetize the vibrating plate portion to different polarities according to the direction of the vibration of the vibrating plate portion; and a detecting means for detecting the inversion of the direction of the magnetic flux caused by the formation of the magnetic circuit to determine the flow rate of the fluid.