초록 ▼

Apparatus for and a method of fabricating a Coriolis flowmeter made primarily of plastic. The Coriolis flowmeter of the invention makes extensive use of plastic and injection molding. All embodiments have a dynamically active structure including a balance bar and/or at least one flow tube that is fo

Apparatus for and a method of fabricating a Coriolis flowmeter made primarily of plastic. The Coriolis flowmeter of the invention makes extensive use of plastic and injection molding. All embodiments have a dynamically active structure including a balance bar and/or at least one flow tube that is formed of plastic by the use of injection molding. Other embodiments includes plastic flanges and/or a plastic case, and/or plastic brace bars, and/or plastic bobbins for pick offs and a drive, and/or plastic mounting surfaces on a balance bar or flow tube for mounting the plastic bobbins of the pick offs and a driver.The injection molding process used to fabricate subject Coriolis flowmeter include the steps forming a material flow path core using a core mold, placing the formed material flow path core into a wrapper mold having a cavity whose surfaces define the exterior surface of the plastic Coriolis flowmeter structure to be formed, injecting low temperature metal or soluble material into the cavity of the wrapper mold, removing the plastic Coriolis flowmeter structure from the wrapper mold, and removing the material flow path core from the plastic Coriolis flowmeter by melting the low temperature metal core or by dissolving the soluble material using hot water.

대표청구항 ▼

1. A Coriolis flowmeter comprising:flow tube means adapted to receive a material flow from a flowmeter inlet and to extend said material flow through said flow tube means to a flowmeter outlet; a driver for vibrating said flow tube means; pick off means coupled to said flow tube means for generating

1. A Coriolis flowmeter comprising:flow tube means adapted to receive a material flow from a flowmeter inlet and to extend said material flow through said flow tube means to a flowmeter outlet; a driver for vibrating said flow tube means; pick off means coupled to said flow tube means for generating output signals representing Coriolis deflections of said vibrating flow tube means with material flow; means responsive to said output signals generated by said pick off means for generating output information pertaining to said material flow; and characterized by the flow tube means being formed of plastic to define a plastic wetted material flow path that extends through the entirety of the length of said flow tube means; said wetted material flow path further includes plastic flow tube stubs each having a first end connected to ends of said flow tube means; a first one of said plastic flow tube stubs has a second end adapted to receive said material flow; a second one of said plastic flow tube stubs has a second end adapted to discharge said material flow.