Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
  • B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/8404—Coriolis or gyroscopic mass flowmeters details of flowmeter manufacturing methods
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
  • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
  • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
  • G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
  • G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
  • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
  • G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
  • G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
  • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
  • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
  • G01F1/78—Direct mass flowmeters
  • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
  • G01F1/84—Coriolis or gyroscopic mass flowmeters
  • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
  • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
  • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
  • G01F1/8495—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits with multiple measuring conduits
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S29/00—Metal working
  • Y10S29/004—Method or apparatus with brazing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S29/00—Metal working
  • Y10S29/048—Welding with other step
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49004—Electrical device making including measuring or testing of device or component part
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49007—Indicating transducer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49428—Gas and water specific plumbing component making

Definitions

• brazing operations used to join the various flowmeter elements
• Braze joints are typically used to affix the flow tube to the brace bar
• Braze joints are also used to join other parts such as driver and pick off brackets and to affix a manifold to the ends of U shaped flow tubes
• Considerable care must be taken in the brazing operations to produce braze joints that securely affixes elements to one another and that are free from microscopic cracks.
• the brazing operation generates tnermal stresses in which a brace bar can cool faster than the flow tube or the other elements to which the brace bar is connected . This rapid and uneven cooling generates a permanent stress in the elements to which the brace bar is connected .
• Coriolis flowmeters are not devices that are produced in volumes on an assembly line. They are low production quantity devices which are handcrafted and carefully inspected at each stage of the manufacturing process to ensure that each part meets its design specifications and is of the required accuracy before it is joined to another part. This high degree of care is required to ensure that the completed flowmeter meets its design specifications and is free from defects which could impair its output accuracy or cause its failure.
• Corioiis flowmeters are often required to process corrosive materials. This degrades the life expectancy and reliability of the flowmeters unless they are faDricated using exotic materials such as stainless steel or titanium. These materials are expensive to purchase and are difficult to fabricate. The use of these materials often results in a flowmeter having elements formed of dissimilar materials; such as a flowmeter that has some stainless steel elements that must be joined to a titanium flow tube to provide an all titanium material flow path that is highly resistant to corrosive process materials.
• a Conolis flowmeter is provided that achieves an advance in the art and solves the above problems including the problem of high material costs and difficulty of manufacturing
• the flowmeter of the present invention solves these problems by the use of plastic for most of the elements embodying the flowmeter
• the flowmeter of the invention solves the above problems using manufacturing techniques which permit many embodiments of the invention to be formed by injection molding
• All embodiments of the invention make extensive use of plastic and injection molding
• all embodiments have a dynamically active structure that is formed entirely of plastic by injection molding
• a Coriolis flowmeter having a single straight flow tube a surrounding plastic balance bar concentric with the flow tube and a plastic brace bar that connects the ends of the balance bar with the flow tube Tne entirety of the dynamically active structure (the flow tube, the balance bar and the brace bar) is formed of plastic by injection molding
• the flow tube ends may be subsequently coupled to end flanges by appropriate bonding techniques
• the elements of the dynamically active structure as well as the end flanges are formed of plastic by injection molding
• This second embodiment provides a plastic wetted flow path that extends through the entirety of the length of the flowmeter with the material flow extending serially from an inlet flange through the flow tube to an outlet flange
• This embodiment is advantageous in that the plastic wetted flow path eliminates problems of corrosion resulting from an interaction between the process material and metal flowmeter elements such as titanium, stainless steel and other metals
• the entirety of the flowmeter is formed of plastic by injection molding
• the above embodiment is formed by an injection molding process that comprises a first step of forming a flow path core mold having a cavity that defines the physical characteristics of the flow path within the flowmeter
• the cavity within the flow path core mold is filled with a metal compound of fusible alloys containing bismuth, lead, tin, cadmium and indium. These alloys have a low melting point of approximately 47 ⁇ Centigrade.
• the injected metal is then allowed to cool to its solid state at which time the split halves of the mold are separated and the formed metal is removed. This metal defines, with precision, the material flow path of the flowmeter.
• the second step of the process involves forming a wrapper mold having a cavity that defines the exterior of the flowmeter elements be formed.
• the formed low temperature metal flow path core is inserted into the ' wrapper mold which is then injected with the plastic that is used to form the exterior of the flowmeter elements.
• the plastic in the wrapper mold is allowed to cool and solidify following which the split halves of the wrapper mold are separated and the formed plastic flowmeter element is removed.
• the exterior of the formed plastic defines the desired external characteristics of the flowmeter element.
• the metal flow path core defining the flow path remains contained with the plastic structure formed by the wrapper molding process.
• This plastic structure defining the flow path is then heated to the temperature required to melt the low temperature metal flow path core.
• the low temperature metal melts and flows out of the plastic flowmeter element so that the resulting structure is a flowmeter element having exterior physical characteristics defined by the void within the wrapper mold and having an inner flow path defined by the flow path metal core formed by the flow path core mold.
• the plastic flow elements formed by the above process are advantageous in that their external physical characteristics are formed with precision by the void within the wrapper mold.
• the flow element has an interior flow path formed with precision by the low temperature metal flow path core formed by the core mold.
• This process provides an idealized flow path having walls that are free from the defects and irregularities typical of the current casting processes associated with the fabrication of metal flow manifolds.
• Another embodiment of the invention provides a Coriolis meter having a single curved flow tube formed of plastic. This flowmeter can be fabricated by an injection molding process similar to that above described for single straight tube flowmeters.
• Coriolis flowmeter having a pair of straight tubes connected between an inlet flange and an outlet flange Tne pair of flow tubes comprises a dynamically balanced structure formed of plastic which may be fabricated by injection molding in a manner similar to that above described
• a single straight tube flowmeter includes an associated balance bar for dynamic balance
• the balance bar may either be concentric with and surround its associated flow tube or alternatively, may be a separate member parallel to and spaced apart from its associated flow tube but coupled to the flow tube by means of an associated brace bar
• the flowmeters of the present invention minimize corrosion problems by tne use of plastic materials These flowmeters are easier to manufacture and therefore have lower costs because of the use of plastic injection molding techniques These flowmeters avoid the prior art problems of nonuniform wall thickness These Conolis flowmeters are further advantageous since the employment of the plastic injection molding provides a flow tube having a controlled wall thickness If desired, the side wall of the flow tube bar may have an axial change in thickness in order to accomplish modal tuning Also, auxiliary elements such as side ribs mav D ⁇ placed on the flow tube or the balance bar to control lateral vibration
• the flow tube and the balance bar and the brace bar comprise an integral structure Tnis integral structure may also include flanges or alternatively the flanges may be affixed at a later time by means of adhesive bonding or plastic solvent welding The case, if provided, may be either metal or plastic and if plastic may be permanently affixed to tne remainder of the plastic elements of the flowmeter to provide a single integral unit formed primarily of plastic except for necessary
• a Coriolis flowmeter corriD ⁇ sing flow tube means adapted to receive a material flow from a flowmeter input and to extend said material flow tnrough 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
• Coriolis flowmeter includes an inlet flange and an outlet flange coupled to ends of said flow tube means to define said flowmeter inlet and said flowmeter outlet
• Conolis flowmeter further includes a case enclosing said flow tube means and said driver and said pick off means
• the Coriolis flowmeter further comprises a balance bar oriented parallel to said flow tube, and brace bar means coupling said flow tube to end portions of said balance bar
• the Coriolis flowmeter is characterized in that said balance bar is formed of plastic
• the Corioiis flowmeter is characterized in that said brace bar means comprises first and second brace bars coupling ends of said balance bar to said flow tube, and a wall surface of said flow tube contains corrugations in a portion of said flow tube between said brace bars
• the Conolis flowmeter is characterized in that said plastic wetted flow path further includes a plastic inlet flange and a plastic outlet flange coupled to ends of said flow tube, and that said balance bar and said brace bar means are formed of plastic
• the Conolis flowmeter is characterized in that said balance bar and said brace bar means and said flow tube are enclosed within a case to define an integral Coriolis flowmeter structure formed of plastic
• Conolis flowmeter is characterized in that said balance bar and said brace bar means and said flow tube are enclosed within a case to define an integral Coriolis flowmeter structure formed of plastic, a plastic case connect link means couples an inner wall of said case to ends of said balance bar and to said flow tube and to said brace bar means
• Coriolis flowmeter further includes plastic links positioned intermediate said flange means and said case connect link means and coupling said inner wall of said case to said flow tube
• the Coriolis flowmeter is characterized in that said balance bar is parallel to said flow tube and has a longitudinal axis offset from the longitudinal axis of said flow tube
• the Coriolis flowmeter is characterized in that said flow tube means comprises a first flow tube and a second flow tube and that said Coriolis flowmeter further comprises brace bar means having a first end connected to said first flow tube and a second end connected to said second flow tube
• brace bar means are plastic
• Corioiis flowmeter is characterized in that said wetted flow path includes a plastic inlet flange and a plastic outlet flange each coupled to ends of said first flow tube and of said second flow tube
• the Coriolis flowmeter is characterized in that said wetted flow path includes a plastic inlet flange coupled to inlet ends of said first and second flow tubes, and a plastic outlet flange coupled to outlet ends of said first and second flow tubes
• the Coriolis flowmeter is characterized in that said wetted flow path further comprises a plastic inlet manifold connecting said inlet flange to said inlet ends of said first and second flow tubes, a plastic outlet manifold connecting said outlet flange to said outlet ends of said first and second flow tubes
• Coriolis flowmeter further comprises a plastic case, plastic coupling means that couples said case to said plastic flow tube means, said flow tube means is olastic and positioned within said case and adapted to receive a material flow, said driver vibrates said plastic flow tube means said pick off means is coupled to said plastic flow tube means for generating output signals representing Conolis defections of said vibrating plastic flow tube means with material flow, said output signals are applied to circuitry that generates information pertaining to said material flow
• Corioiis flowmeter is characterized in that said driver has a plastic bobbin coupled to said flow tube means, and said pick off means having a plastic bobbin coupled to said flow tube means
• Another aspect is a method of fabricating structure of a Conolis flowmeter including flow tube means, said method comprising the steps of forming a core defining a material flow path of said flow tube means by injecting a low melting point metal or soluble material into a cavity of a core mold with said cavity defining said material flow path, placing said formed material flow path core into a cavity of a wrapper mold and closing said wrapper mold to form a cavity between the outer surface or said formed material flow path core and the interior surface of said cavity of said wrapper mold, said cavity of said wrapper mold defines the outer surface of said flow tube means, filling said cavity of said wrapper mold with plastic to form a molded plastic flow tube means that contains said formed material flow path core, removing said molded plastic flow tube means containing said formed material flow path core from said wrapper mold, and removing
• the method further includes the step of forming said core mold having said cavity that defines said material flow path of said flow tube means
• the method further includes the step of forming a wrapper mold having a cavity that defines said outer surface of said flow tube means and further having said means that locates said formed material flow path core in said cavity of said wrapper mold
• the method is characterized in that said flow tube means defines a pair of flow tubes, the step of forming said core mold includes the step of forming said core mold so that said cavity of said core mold defines the material flow paths of said pair of flow tubes, the step of forming said material flow path core includes the step of forming said material flow path core of said pair of flow tubes, the step of filing said cavity of said wrapper mold with plastic includes the step of forming a molded plastic structure defining said pair of flow tubes each containing one of said material flow path cores
• said method is characterized in that said fabricated Conolis flowmeter structure further comprises a first brace bar coupling a first end of each of said pair of flow tubes to each other and a second brace bar coupling a second end of each of said flow tubes to each other, characterized in that said step of forming a wrapper mold includes the step of forming a cavity in said wrapper mold that defines the outer surface of said fabricated Conolis flowmeter structure including said first and second brace bars and said pair of flow tubes, the step of filing said cavity of said wrapper mold with plastic includes the step of forming a plastic Conolis flowmeter structure defining said pair of flow tubes and said brace bars and with said formed Conolis flowmeter structure containing said formed material flow path core
• said fabricated Coriolis flowmeter structure further comprises driver mounting elements and pick off mounting elements affixed to said first and second flow tubes
• said step of forming said wrapper mold includes the step of forming a cavity in said wrapper mold that defines the outer surface of
• said method is characterized in that said fabricated flowmeter structure further comprises" an inlet flange coupled to an inlet end of said flow tubes and an outlet flange coupled to an outlet end of said flow tubes, characterized in that said step of forming a wrapper mold includes the step of forming having a cavity that defines the outer surface of said Conolis flowmeter structure including said flow tubes, said first brace bar and said second brace bar, said inlet flange and said outlet flange, the step of filing said cavity of said wrapper mold with plastic includes the step of forming a molded plastic Coriolis flowmeter structure that that defines the exterior surface of said flow tubes, said first and second brace bars and said inlet flange and said outlet flange with said plastic Coriolis flowmeter structure containing said formed material flow path core.
• said fabricated flowmeter structure further comprises: an inlet manifold coupling said inlet flange to an inlet end of
• Conolis flowmeter structure comprises a flow tube and a concentric balance bar surrounding said flow tube
• the step of forming a core mold includes the steps of forming a first core mold having a cavity that defines the material flow path of said flow tube
• said step of forming a core mold further inctudes the step of forming a second core mold having a cavity that defines the space between the exterior surface of said flow tube and the interior surface of said balance bar
• the step of forming a core includes the steps of injecting low temperature metal or soluble material into said, first core mold to form said material flow path core and further includes the step of injecting low temperature metal or soluble material into said second core mold to form a hollow balance bar core that defines said space between the exterior surface of said flow tube and said interior surface of said balance bar
• the step of forming said wrapper mold includes the steps of forming a cavity adapted to receive said formed material flow path core and said formed hollow balance bar core
• the step of placing includes the steps of placing said formed material flow path core into said wrapper mold cavity and placing
• said fabricated Coriolis flowmeter structure further comprises a first brace bar coupling a first end of said balance bar to said flow tube and a second brace bar coupling second end of said balance bar to said flow tube
• said step of forming a wrapper mold includes the step of forming having a cavity in said wrapper mold that defines the outer surface of said Conolis flowmeter structure including said flow tube and said balance bar as well as said first brace bar and said second brace bar
• the step of filing said cavity of said wrapper mold with plastic includes the step ot forming a molded plastic Conolis flowmeter structure that defines said flow tube and said concentric balance bar as well as said first and second brace bars and that contains said material flow path core and said hollow balance bar core
• said fabricated flowmeter structure further comprises an inlet flange coupled to an inlet end of said flow tube and an outlet flange coupled to an outlet end of said flow tube characterized in that said step of forming a wrapper mold includes the step
• said fabricated Coriolis flowmeter structure further comprises driver mounting elements and pick off mounting elements affixed to said balance bar
• the step of forming said wrapper mold includes the step of forming a cavity in said wrapper mold that defines the outer surface of said Conolis flowmeter structure including said flow tube, said balance bar, said brace bars, said inlet manifold and said outlet manifold, and said driver mounting elements and pick off mounting elements
• the step of filing said cavity of said wrapper mold with plastic includes the step of forming a molded plastic Coriolis flowmeter structure whose outer surface defines said flow tube, said balance bar, said brace bars, said driver mounting elements and pick off mounting elements on said balance bar, said inlet manifold and said outlet manifold and with said plastic Conolis flowmeter structure containing said formed material flow path core and said hollow balance bar core.
• FIG. 1 discloses a Coriolis flowmeter having a pair of straight flow tubes.
• FIG. 2 discloses a Conolis flowmeter having a single straight flow tube
• FIG 3 discloses a Conolis flowmeter having a single straight flow tube with corrugations in the dynamically active portion of the flow tube.
• FIG 4 discloses a Corioiis flowmeter having a single straight flow tube surrounded by a concentric balance bar and a case enclosing the flow tube and the balance bar
• FIGS. 5 and 6 disclose Conolis flowmeters having a pair of substantially U- shaped flow tubes.
• FIG. 7 discloses a core mold used to form the core of a flow path, of a dual straight tube flowmeter
• FIG. 8 discloses the flow path core formed by the core mold of FIG. 7
• FIG. 9 discloses a wrapper mold and the flow path core prior to the flow path core being set into cavity segments of the wrapper mold
• FIG. 10 discloses the Coriolis flow element structure formed by the wrapper mold of FIG. 9 following the completion of the molding process
• FIG. 1 1 discloses the flowmeter structure of FIG 10 following its removal from the wrapper mold, and the removal by melting of the flow path core.
• FIG. 12 discloses the flowmeter structure of FIG 1 1 coupled to end flanges and an enclosing case.
• FIG. 13 discloses the bottom half of a wrapper mold used to form the flowmeter of FIG. 5 by a molding process.
• FIG. 14 discloses half of the wrapper mold used to form the flowmeter of FIG. 2 together with the sectioned flow path core as well as the sectioned balance bar core.
• FIGS 15, 16, 17 are flow charts of the methods used to fabricate the Conolis flowmeters embodying the invention.
• FIG. 1 discloses a section view of Coriolis flowmeter 100 having a pair of flow tubes 101 and 102 enclosed within a case 103.
• a material flow enters the flowmeter at inlet 106 of flange 104A and extends through flow channel 111 of neck 105 and case end 109A to diverter 114 which splits the material flow into two halves which are extended through flow tubes 101 and 102.
• Flow tubes 101 and 102 extend through brace bars 1 10A and 110B. Material flow exits the flow tubes at combiner 116 and extends through case end 109B and flow channel 1 12 of neck 115 and outlet 107 of flange 104B.
• Necks 105 and 1 15 couple flanges 104A and 104B to ends 109A and 109B of case 103.
• the end portions of the flow tubes are coupled to each other by brace bars 110A and 110B.
• a magnet and coil of driver D is coupled to flow tubes 101 and 102 to vibrate them transversely to their longitudinal axis in phase opposition.
• Driver D is energized by signals received from meter electronics 121 over path 123
• the material flow through the vibrating flow tubes generate Coriolis forces which are detected by left pick off LPO and right pick off RPO which generate signals indicative of the magnitude of the Coriolis forces.
• the output signals of the pick offs are extended over paths 122 and 124 to meter electronics 121 which processes these signals and applies output information over path 125 indicative of the material flow.
• flow tubes 101 and 102 as well as necks 105 and 115 may be formed of plastic by a injection molding process to provide a wetted flow path through the entirety of the flowmeter between inlet 106 and outlet 107.
• case ends 109A and 109B and flanges 104A and 104B may be formed of plastic by a molding process
• a plastic case 103 may be affixed by adhesive bonding to case ends 109A and 109B to provide a flowmeter that is made up entirely of plastic except for tne metal conductors within the coils of d ⁇ ver D and pick offs LPO and RPO along with their associated magnets
• the case may be fabricated independently of the remainder of flowmeter 100 and subsequently affixed to the case ends by adhesive bonding
• the case may be formed of either metal or plastic Description of FIG 2
• FIG 2 discloses a sectioned Conolis flowmeter 200 having a single flow tube 201 coupled by brace bars 210A and 210B to cylindrical balance bar 202 which is concentric with the longitudinaf-center of flow tube 201
• the material flow is from inlet 106 of flange 104A through flow channel 1 1 1 of neck 105, through flow tube stub 217A to brace bar 210A, through flow tube 201 , through flow tube stub 217B to brace bar 210B, through flow channel 1 12 of neck 1 15 to outlet 107 of flange 104B
• the portion of flow tube 201 enclosed by balance bar 202 is defined as the dynamically active portion of the flow tube This portion is vibrated by driver D to generate Conolis forces which are detected by pick offs LPO and RPO which apply signal over conductors 122 and 124 to meter electronics 121 in the same manner as described in connection with FIG 1 Meter electronics applies signals over conductor 122 to driver D to vibrate flow tube 201 and balance bar 202 in phase opposition
• All or part of the structure shown on FIG 2 may be formed of plastic by a molding process If desired, only flow tube 201 and balance bar 202 may be formed of plastic The remainder of the structure of FIG 2 could then be metal Alternatively, flanges 104A and 104B could be additionally formed of plastic Alternatively, the case ends 109A and 109B and easel 03 could be formed of metal or plastic independently and affixed by adhesion after the remainder of the flowmeter is formed and calibrated Description of FIG 3
• FIG 3 discloses a sectioned Coriolis flowmeter 300 which is similar to the Coriolis flowmeter of FIG 2 in that it has single flow tube 301 coupled by brace bars 310A and 31 OB to balance bar 302 which is concentric with flow tube 301
• Material flow extends through the flowmeter 300 from inlet 106 of flange 104A, flow channel 1 1 1 of neck 105, through case end 109A through stub 317A and the active portion of flow tube 301 between Drace bars 310A and 310B, through stub 317B and case end 109B, through flow channel 1 12 of neck 1 15 to outlet 107 of flange 104B
• the flowmeter 300 differs from flowmeter 200 only in that the dynamically active portion of flow tube 301 intermediate brace bars 310A and 310B has corrugations 305 which alter the vibrational characteristics of the flow tube as described in detail in U S Patent 5,814 739
• the entirety of the Conolis flowmeter 300 is made of plastic by tne use of
• the case 103 may be fabricated independently and affixed to the remainder of the elements of the flowmeter by means of adhesive bonding
• the case may be formed of metal
• the dynamically active portion of the flowmeter including the entirety of flow tube 101 advantageously will be plastic formed by a molding operation Description of FIG 4
• FIG 4 discloses a sectioned Conolis flowmeter 400 having a single straight flow tube 401 surrounded by a concentric balance bar 402 having non-uniform weight and stiffness distribution Balance bar 402 is connected at its ends by brace bars 405 to flow tube 401 Brace oars 405 are connected by case connect links 417A and 417B to the inner wall of case end 407
• the ends of flow tube 401 are connected via flow channels 41 1 to inlet flange 409A and to outlet flange 409B
• Each flange 409A and 409B includes bolt holes 410 for connection to a supply and exit lines
• Each flange further includes radial surface 412 and circular protrusion 413 surrounding inlet 414 and affixed to the flange end surface 415
• Case 403 is connected to case ends 407 which are connected to neck elements 416A and 416B which are coupled to flanges 409A and 409B at their terminus
• Balance bar 402 has non-uniformed stiff
• Pick offs LPO and RPO detect the Conolis response of flow tube 401 as it vibrates during conditions of material flow
• the output signals of the pick offs are extended over conductors 422 and 423 and through feed through 421 to meter electronics 425 which processes the signals and applies output information to path 426 regarding the material flow
• FIG 5 discloses a Coriolis flowmeter 500 having a pair of substantially U- shaped flow tubes 552A and 552B which extend through brace bars 520 and 521 and terminate in manifolds 502A and 502B Manifolds 502A is connected by neck 570A inlet flange 501A, manifold 502B is connected by neck 570B to outlet flange 501 B Flow tubes 552
• Driver D is coupled to top segments of flow tubes 552A and 552B to vibrate them in phase opposition in response to signals received over path 524 from meter electronics 525
• Side segments 553 and 554 are coupled to pick offs LPO and RPO which generate signals representing the Coriolis response of the vibrating flow tubes with material flow
• These signals are extended over paths 522 and 523 to meter electronics 525 which processes signals and applies output information to path 526 pertaining the material flow
• the entire meter 500 with the exception of the coils of pick offs LPO and
• RPO and driver D may be formed of plastic by a molding process with the mold parting line shown by dotted lines 561 and 562
• Flanges 501 A and 501 B may be either be formed in the same process or alternatively may be formed independently and coupled by plastic adhesion to necks 570A and 570B
• the Conolis flowmeter elements of FIG 5 may be enclosed within a case
• FIG 6 discloses another possible exemplary embodiment of the invention comprising a Co olis flowmeter 600 having a pair of substantially U-shaped flow tubes 601 and 602, manifolds 610 and 615, spacers 606, 612, and 613, input flange 609 and output flange 611
• the top portion of the flow tubes is connected to driver D which vibrates the flow tubes in phase opposition
• the side legs 604A, 604B, 605A, and 605B of the flow tubes are coupled to pick offs LPO and RPO which generates output signals representing the Conolis response of the vibrating flow tube with material flow
• the output signals of the pick offs are applied over conductors 614 and 618 to meter electronics 625 which process the information and applies output signals to path 626 pertaining to the material flow
• the lower extremity of side leg 605A and 605B are connected to manifold extensions 608 to couple the side legs to manifolds 610 and 615
• Input flange 609 is connected to manifold 610 which receives the input material flow and divides it into two sections which are extended to a lower legs 605A and 605B of the flow tubes
• On the output side manifold 615 receives the output flow of side legs 604A and 604B and recombines them into a single flow which is applied via output flange 61 1 to a material destination (not shown)
• Conolis flowmeter 600 may be fabricated by molding as subse ⁇ uently described by a process which includes the steps of forming a core mold which extends through the flanges 609 and 61 1 , and manifolds 610 and 615 The process further includes using the core molds in combination with a wrapper mold to form the Conolis flowmeter 600 to comprise an all plastic flowmeter with the exception of the metallic conductors associated with driver D and pick offs LPO and RPO Alternatively and if desired, the flow tubes may be molded separately and adhesive bonded to the sockets of manifolds 610 and 615
• FIG 7 discloses a core mold 700 having an upper half 701 , a lower half 702 and vent holes 703 and 704 which are used to inject plastic into the cavity which is designated generally as 706
• Cavity segment 706 includes flow path core cavity segments 706A, 706B, 706C, 706D 706E, and 706F
• Cavity segment 706 further includes manifold cavity segments 707 and 708 and core locating segments 719 and 720
• the flow path core shown on FIG 8 is formed by the core path mold 700 of FIG 7 when the upper half 701 is lowered so that its bottom surface contacts the upper surface 709 of lower half 702 Following this, a low temperature fusible alloy is injected into one of holes 703 or 704 with the other being used as an air vent After the injected metal alloy solidifies, the two halves 701 and 702 of the mold are separated with the metal alloy within the cavity segments of
• FIG. 9 discloses the wrapper mold 900 which is used to fabricate a completed flowmeter using the flow path cores of FIG. 8.
• Wrapper mold 900 comprise an upper half 901 , and a lower half 902 which are shown separated but which are joined during the injection molding process.
• the process begins when the molded flow path core 800 of FIG. 8 is inserted into the cavity of lower half 902.
• This cavity on FIG. 9 has structure designated generally as 928 and 929 for the flow tube elements to be formed, and
• the molded flow path core 800 shown on FIG. 8 is inserted into the cavity of the lower half 902.
• the rectangular protrusions 819 and 820 (not shown) on the core ends fit into rectangular cavity segments 919 and 920 in the mold to locate the flow path core within the cavity.
• the upper half 901 is then lowered so that it ' s bottom surface contacts the upper surface 91 1 of lower half 902 following which plastic is injected into either opening
• FIG. 9 shows cavity segments 907A and 908A for brace bars 907 and 908 and pick offs and drive brackets which are formed during this molding process.
• the formed structure is heated to the level required to melt the metal flow path core 800 contained within the plastic structure.
• the metal melts flows out and leaves the flowmeter structure 1 100 shown on FIG. 1 1 which includes two flow tubes 1001 and 1002 having hollow centers formerly occupied by the metal flow path core 800 shown on FIG. 8.
• the structure shown on FIG. 1 1 also includes input manifold 904 and output manifold 906 brace bars 907 and 908. Opening 803 of input manifold
• FIG 12 shows a completed Coriolis flowmeter 1200 formed by the injection molding process described for FIGS 7, 8, 9, 10, and 1 1
• Flowmeter 1200 is assembled using the flowmeter structure 1 100 of FIG 1 1
• Pick offs LPO and RPO and driver D including their coils and magnets (not shown) are fastened to structure 1 100 and wires 1222, 1223, and 1224 are connected from pick offs LPO and RPO and driver D to electrical feed through 1221 in the case 1201
• Case 1201 is then adhesive bonded to the exterior surfaces of manifolds 904 and 906 Following that flanges 1202 and 1203 are adhesive bonded to the axial end portions of case 1201 as well as to the radial exterior cylindrical surfaces of manifold
• meter electronics 1221 which over conductor 1223 applied signals required to energize driver D to vibrate flow tubes 1001 and 1002 in phase opposition Conductors 1222 and 1224 receive the signals from pick offs
• LPO and RPO representing the Conolis forces induced in vibrating flow tubes 1001 and 1002 with material flow Meter electronics receive these signals over conductors 1222 and 1224, processes the signals and applied output information to path 1225 pertaining to the material flow Descriptions of FIG 13
• FIG 13 discloses the lower portion 1301 of the wrapper mold 1300 used to fabricate the Conolis flowmeter of FIG 5 by injection molding to produce an all plastic flowmeter with the exception of metal conductors in driver D and pick offs LPO and RPO of FIG 5
• Wrapper mold 1300 includes a lower wrapper mold 1301 having cavity segments that define the exterior of the Conolis flowmeter of FIG 5
• the last two digits of each reference number on the two drawings specifies the correspondence
• flow tubes 552A and 552B on FIG 5 are defined by cavity segments 1352A and 1 352B on FIG 13
• wrapper mold 1300 In describing the function of wrapper mold 1300 it is assumed that the flow path core has been formed as pnorly described to form a metal structure representing the flow path of flow tubes 552A and 552B as well as the interior of the structural elements connected to the flow tubes such as flow path necks 570A and 570B This formed flow path core is inserted into the cavity segments of the wrapper mold 1301
• the cavity segments on FIG 13 include segments 1352A and 1352B which define a pair of substantially U-shaped flow tubes, cavity segments 1354A and
• cavity segmentsl 320 and 1321 which define brace bars 520 and 521 of FIG 5, cavity segments 1350A B, C and D which define flow channels 550A, B, C, and D of FIG 5 cavity segmentsl 302A and 1302B which define manifolds 502A and 502B and cavity segments 1370A and 1370B which define flow path necks 570A and 570B
• the flowmeter structure of FIG 5 is formed when a flow path core of a low melting temperature alloy is inserted into the cavity of mold segment 1302 Then an upper mating mold having cavity segments complementary to that of lower wrapper mold 1301 and having a recess for accommodating the center upwardly extending segment 1302 of wrapper mold 1301 is lowered onto wrapper mold 1301 to form an enclosed volume
• the structure of FIG 5 is formed when plastic is injected into the wrapper mold cavity segments After the inserted and injected plastic has solidified the upper and lower portions of wrapper mold 1300 are separated and the formed structure is removed from the cavity segments of wrapper mold 1301 The flow path core is then removed by melting
• the remaining structure is identical to that shown on FIG 5 with the exception of flanges 501 A and 501 B They are separately formed and affixed by adhesive bonding to the flow path necks 570A and 570B to form the completed all plastic flowmeter of FIG 5 Description of FIG 14
• FIG 14 discloses the details of a wrapper mold 1400 used to fabricate the single straight tube Coriolis flowmeter of FIG 2
• the cavity segments on FIG 14 are identified by reference numbers whose last two digits (not including alphabetical characters) are identical to the last two digits of the parts of the flowmeter of FIG 2 to which the cavity elements of FIG 14 correspond
• a flow path core is formed by the pnorly described techniques to define a metal element representing the flow path of flow tube 101 of FIG 2
• This core on FIG 14 is the elongated cross hatched element 1401 extending the length of the cavity structure
• Core 1401 extends the length of the flowmeter from cavity segment 1404A defining flange 104A of FIG 2 to output flange cavity segment defining flange 104A on FIG 2
• the use of wrapper mold 1400 also requires that a core be previously formed representing the space between inner wall of balance bar 202 and exterior of flow tube 201 on FIG 2
• This balance bar core is the cross hatch area designated as element 1403
• Cavity element 1402 represents the cavity segment that will be filled with plastic during the injection molding operation to define balance bar 202
• Element 1403 includes upwardly projecting stubs LPO, D, and RPO to define openings in the balance bar 202 for receiving driver D, and pick offs LPO and RPO The mating downwardly projecting stubs on cross hatch
• Elements 1417A and 1417B are the segments of the cavity segment that defines flow tube stubs 217A and 217B
• Cavity segments 1410A and 1410B define brace bars 210A and 210B
• cavity segments 1409A and 1409B define case ends 109A and 109B
• Cavity segments 1405A and 1415B define necks 105 and 1 15 of FIG 2 connecting the case ends to the flanges
• Cavity segments 1404A and 1404B define flanges 104A and 104B
• the flowmeter of FIG 2 is formed by wrapper mold 1400 by the steps of forming the flow path core 1401 , forming the balance bar core 1403, inserting the balance bar core 1403 over the flow path core 1401 , positioning cores 1401 and 1403 within the cavity segments of the wrapper mold 1400 on FIG 14, lowering the upper half (not shown) of wrapper mold 1400 onto the lower half shown on FIG 1 *-*- injecting plastic into the cavity segments of the wrapper mold of FIG 14, allowing the injected plastic to cure and solidify, separating the two halves of the wrapper mold 1400 removing the formed solidified plastic material which then has a physical appearance of the Coriolis flowmeter of FIG 2 with the exception of the meter electronics and conductors and d ⁇ ver D and pick offs LPO and RPO
• the formed structure is then heated a sufficient amount to melt the core material which flows out of the interior of the formed structure leaving a completed all plastic flowmeter identical to that of FIG 2 with tne exception of the necessary metal elements including the conductors of the coil
• Step 1502 on FIG 15 begins the process and includes the step of forming the material flow path cores 801 and 802 of low temperature metal or soluble material using core mold 700
• FIG 8 shows the core molds 801 and 802 formed by injection molding using core mold 700 including its upper half 701 and its lower half 702
• step 1504 the formed material flow path cores 801 and 802 are removed from the core mold 700 and placed in the cavity segments, including cavity segments 928, 929 and 904A and 906A of wrapper mold 900 having an upper half 901 and a lower half 902
• the protrusions 818 and a corresponding protrusion (not shown ) on the right end of cores 801 and 802 facilitates the accurate placing of cores 801 and 802 in the cavity segments of wrapper mold 900
• Wrapper mold 900 also includes cavity segments 907A 908A LPO RPO and D for forming brace bars, 907, 908, and mounting elements for driver D and pick offs LPO and RPO
• step 1506 the two halves 901 and 902 of the wrapper mold 900 are closed and plastic is injected into the cavities of wrapper mold 900 to form a plastic Conolis flowmeter structure 1 100 containing the material flow path cores 801 and 802 and other structures including manifolds 904 and 906 shown on FIG 1 1
• step 1508 the formed Conolis flowmeter plastic structure 1 100 containing the material flow path cores 801 and 802 is removed from wrapper mold 900
• step 1 510 the plastic Conolis flowmeter structure 1 100 is heated to dissolve the low temperature metal cores 801 and 802 or is subjected to heated water to dissolve the soluble material defining the material flow path cores 801 and 802
• the plastic Conolis flowmeter structure 1 100 is then subject to further manufacturing steps in order to form a completed flowmeter as shown in FIG 12 Description of FIG 16
• FIG 16 discloses the process steps used to form the dual curved tube Conolis flowmeter 500 of FIG 5 using wrapper mold 1300 shown on FIG 13
• Step 1602 begins this process and includes the step of forming a pair of curved material flow path cores of low temperature metal or soluble material These cores are not shown on FIG 13 but are formed using a core mold similar to that of FIG 7 but of a curved configuration with the formed material flow path cores being curved but otherwise comparable to material flow path cores 801 and 802 of FIG 8
• step 1604 the formed curved material flow path cores (not shown) are inserted into cavity segments 1352 and 1354 of the lower portion 1301 of wrapper mold 1300
• This mold further includes cavity segments 1320 and 1321 defining brace bars, 1350 defining flow tube extensions 1302 defining input and output manifolds and 1370 defining neck elements for flanges 501 of FIG 5 which are subsequently added
• step 1606 the top portion of (not shown) of wrapper mold 1300 is positioned onto the lower portion 1301 and plastic is injected into the cavity segments of the wrapper mold to form the plastic Conolis flowmeter structure 500 of FIG 5 containing the curved material flow path cores (not shown) on FIG 13
• step 1608 the formed plastic Conolis flowmeter structure 500 is removed from the lower portion 1301 of wrapper mold 1300
• step 1610 the material flow path cores are removed from the plastic Conolis flowmeter structure 500 using heat to melt the low temperature metal or by dissolving the soluble material representing the cores by immersing the plastic Conolis flowmeter structure 500 in hot water Description of FIG 17
• FIG 17 illustrates the process steps used to form the single straight tube Coriolis flowmeter 200 using the wrapper mold of FIG 14
• step 1702 the material flow path core 1401 is formed of low temperature metal or soluble material using a core mold similar to that of core mold 700 but not otherwise shown
• step 1704 core 1403 is formed defining the space between the exterior of the molded full flow path core 1401 and the inner surface of balance bar 202
• step 1706 the flow path core 1401 is inserted axially into the open end of core 1403
• step 1708 cores 1401 and 1403 are inserted into the cavity of wrapper mold 1400 with the cavity having an inner surface defining the plastic Conolis flowmeter structure 200
• step 1710 plastic is injected into the cavities of wrapper mold 1400 which contains the cores 1401 and 1403
• step 1712 the formed plastic Coriolis structure 200 is removed from wrapper mold 1400
• step 1714 cores 1401 and 1403 are removed from the formed plastic Coriolis flowmeter structure 200 by heating the low temperature metal comprising the cores or by dissolving the soluble material comprising the cores using hot water
• the present invention is not limited to the described embodiment, but that it may be used with other types of Conolis flowmeters including single tube flowmeters of irregular or curved configuration
• a Coriolis plastic flowmeter can be formed by the use of injection molding
• the entirety of the described Coriolis flowmeters can be formed by a single injection molding operation
• an all plastic flowmeter can be formed by separate injection molding or other forming operations in which parts are formed separately and later joined together by means of adhesive bonding This is particularly true for certain embodiments in which it may be desirable to form the case as a separate element which is later bonded to elements pnorly formed by injection bonding
• the metal case can be separately formed and applied by appropriate bonding techniques to the remaining portions of the flowmeter which may be pnorly formed by appropriate injection molding techniques
• the low temperature allov may be a cerro-indium alloy termed Cerrolow 117 that may be purchased from McMaster - Carr Supply Company whose address is P O Box 4355, Chicago, Illinois 60680-4355
• plastic as used herein means any of various nonmetallic compounds, synthetically produced (usually from organic compounds by polymerization) which can be molded into various forms and hardened for commercial use This plastic has an elastic modulus as low as 20,000 psi for pure and as high as 2,000,000 for glass filled in the plastic
• the soluble material referred to herein may be a soluble wax available from Dussek Yates Investment Casting Wax Ine whose address is, 1815-t w 15th Street Chicago, IL 60608 Phone 312 666 9850
• Fax 312 666 7502 This soluble wax may be dissolved by placing the plastic Conolis flowmeter structure containing the soluble wax core in hot water

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