MAGNETICALLY-INDUCTIVE FLOW METER

Abstract

The disclosure relates to a magnetically inductive flow meter for insertion into a pipeline and for determining a flow-rate-dependent measurement variable induced in the medium, comprising: a housing, a front body being arranged on an end face of the housing, which front body seals the end face of the housing; a measurement electrode arrangement for forming galvanic contact with the medium and for tapping an induced voltage in the flowing medium; a field system for generating a magnetic field that passes through the end face of the housing, the field system being arranged in the housing, the field system comprising a coil arrangement, the coil arrangement comprising a coil arrangement carrier for winding a coil wire, and the coil arrangement carrier and the front body being monolithic.

Claims

1-14. (canceled)

15. A magnetically-inductive flow meter for insertion into a pipeline through which a medium flows and for determining a flow-rate-dependent measured variable induced in the medium, comprising: a housing, wherein, on an end face of the housing, a front body is arnmged which seals the housing at the end face; a measurement electrode arrangement for forming a galvanic contact with the medium and. for tapping an induced voltage in the flowing medium; a field system for generating a magnetic field passing through the end face of the housing, wherein the field system is arranged in the housing, wherein the field system comprises a coil arrangement wherein the coil arrangement comprises a coil arrangement carrier for winding a coil wire around, wherein the coil arrangement carrier and the front body are formed monolithically.

16. The magnetically-inductive flow meter according to claim 15, wherein the coil arrangement has a contacting body arrangement, wherein the contacting body arrangement comprises a first contacting body and a second contacting body, wherein a first coil wire end of the coil wire is connected to a first section of the first contacting body, wherein a second coil wire end of the coil wire is connected to a first section of the second contacting body.

17. The magnetically-inductive flow meter according to claim 16, wherein the respective first section of the first contacting body and of the second contacting body has a longitudinal axis which lies in a cross-sectional plane of the coil arrangement carrier.

18. The magnetic-inductive flow meter according to claim 16, wherein the first contacting body and the second contacting body in each case have a second section Which is connected in a form-fitting manner to the coil arrangement carrier and is preferably surrounded by the coil arrangement carrier.

19. The magnetically-inductive flow meter according to claim 18, wherein the first contacting body and the second contacting body in the second section each have a longitudinal axis which is inclined to the longitudinal axis of the first section.

20. The magnetically-inductive flow meter according to at least one of claim 19, wherein the first contacting body and the second contacting body in each case have a third section for contacting the coil wire s operating circuit an operatin circuit.

21. The magnetically-inductive flow meter according to claim 15, wherein the measurement electrode arrangement is arranged in the front body, wherein the measurement electrode arrangement has two measurement electrodes, each of which has an end section for connecting the measurement electrodes to a measurement circuit, wherein the end section is arranged in the housing.

22. The magnetically-inductive flow meter according to claim 21, wherein a longitudinal axis of the respective third section of the first contacting body and of the second contacting body runs substantially parallel to the longitudinal axis of the coil arrangement carrier and/or to the end section of the measurement electrodes.

23. The magnetically-inductive flow meter according to claim 22, wherein a contacting device is configured to connect the measurement electrodes to the measurement circuit and the contacting bodies to the operating circuit.

24. The magnetically-inductive flow meter according to claim 23, wherein the contacting device is designed as a printed, circuit board which has contact terminals. wherein two contact terminals are formed to complement the end sections of the two measurement electrodes and are configured to electrically connect the end sections of the measurement electrodes to the measurement circuit, wherein two contact terminals are formed to complement the third sections of the two contacting bodies and are configured to electrically connect the third sections of the two contacting bodies to the operating circuit, wherein the contacting device is arranged in a form-fitting manner on the front body.

25. The magnetically-inductive flow meter according to claim 15, wherein the front body has at least one elevation for fastening the front body when the coil wire is being wound.

26. A method for producing a field system of a magnetically-inductive flow meter comprising the production steps of providing a core and a mold cavity, wherein the mold cavity has a receptacle for in each case one of the contacting bodies, arranging the contacting bodies in the respective receptacles; forming a cavity between core and mold cavity by bringing together the core and the mold cavity; filling the cavity and encapsulating the contacting bodies with a casting compound forming the front body and the coil arrangement carriers; and curing the casting compound.

27. The method according to claim 26, comprising the method steps of: winding the coil wire onto the first section of the first contacting body; winding the coil wire around the coil arrangement carrier along a first direction substantially parallel to the longitudinal axis of the coil arrangement carrier; winding the coil wire around the coil arrangement carrier along a second direction which is oriented opposite to the first direction; winding the coil wire onto the first section of the second contacting body. cm 28. The method according to claim 26, wherein the first contacting body and/or the second contacting body is shaped into a final state k means of bend-forming when the core and the mold cavity are brought together, wherein, in the final state, the longitudinal axis in the first section of the first contacting body in the cross-sectional plane of the coil arrangement carrier runs substantially perpendicular to the longitudinal axis of the coil arrangement carrier, and the longitudinal axis of the third section of the first contacting body runs substantially parallel to the longitudinal axis of the coil arrangement carrier.

Description

[0067] The invention is explained in greater detail with reference to the following figures. The following are shown:

[0068] FIG. 1 two views of an embodiment of the front body and coil arrangement carrier according to the invention,

[0069] FIG. 2 a side view of the configuration of the front body, with mounted coil core, field return, and contacting body,

[0070] FIG. 3 two views of the embodiment of the front body according to the invention mounted on a housing,

[0071] FIG. 4 a magnetically-inductive flow meter according to the invention installed in a pipeline, and

[0072] FIG. 5 a flowchart of an embodiment of the method according to the invention for producing a front body.

[0073] FIG. 1 shows two views of an embodiment of the front body and coil arrangement carrier according to the invention. The front body 5 has a cylindrical base body. In addition, the front body 5 has two end faces, wherein a first end face is medium-contacting, and a second end face is located in the interior of the housing 3. A measurement electrode arrangement 6 is arranged in the front body 5. The measurement electrodes 23, 24 extend from the first end face to the second end face, through the front body 5. The measurement electrodes 23, 24 each have a medium-contacting front section and an end section 25 which extends into the interior of the housing 3. The measurement electrodes 23, 24 each have a longitudinal axis 33 which runs parallel to the longitudinal axis of the coil arrangement carrier 9 and intersects the second end face perpendicularly. According to the embodiment shown, the measurement electrodes 23, 24 are in each case designed as a pin electrode.

[0074] The front body 5 is formed monolithically with a coil arrangement carrier 9. According to the depicted embodiment, a center piece 32 connected monolithically to the front body 5 and to the coil arrangement carrier 9 is arranged between the front body 5 and the coil arrangement carrier 9. The coil arrangement carrier 9 has a hollow-cylindrical basic shape. The winding surface onto which the coil wire 10 is wound is bounded by two disks in both longitudinal directions of the coil arrangement carrier 9. A coil arrangement 8 is attached to the coil arrangement carrier 9. According to the embodiment shown, the coil arrangement 8 comprises exactly one coil.

[0075] The coil wire ends of the coil wire 10 are connected to two contacting bodies 11, 12, in particular to the first sections 15 of the contacting bodies 11, 12. The contacting bodies 11, 12 are shaped such that the respective longitudinal axes of the first section 15 of the contacting bodies 11, 12 lie in a common cross-section of the coil arrangement carrier 9. In addition, the contacting bodies 11, 12 are shaped such that a second section 19 is inclined to the longitudinal axis of the coil arrangement carrier 9, and the longitudinal axis 28 of a third section 21 runs parallel to the longitudinal axis 18 of the coil arrangement carrier 9. The contacting bodies 11, 12, in particular the respective third section 21 of the contacting bodies 11, 12, are partially encapsulated by the polymer matrix forming the coil arrangement carrier 9. In the embodiment shown, the second section extends into the center piece 32. The third section 21 extends from the second end face of the front body 5 in the direction of the interior of the housing 3.

[0076] A separately depicted contacting body has, in dashed lines, the individual longitudinal axes 16, 20, 28 of the three sections 15, 19, 21.

[0077] FIG. 2 shows a side view of the configuration of the front body 5 and of the coil arrangement carrier 9 with mounted coil core 30, field return 29, and contacting device 27. The front body 5 shown has all essential features of FIG. 1. In addition to the coil arrangement carrier 9 and to the front body 5, a field return 29, a coil core 30, which extends through the cross-sectional areas of the coil, and a contacting device 27, are shown.

[0078] In addition, FIG. 2 shows a coil core 30 with a field return 29 and a contacting device 27, wherein the contacting device 27 has contact terminals 31 for the measurement electrodes and the contacting bodies, for connecting precisely these to a measurement and/or operating circuit 22, 26. The coil core 30 is cylindrical, and the field return 29 has the basic shape of a double-bent strip. Field return 29 and coil core 30 can be formed monolithically or consist of at least two, assembled, individual components. The contacting device 27 is formed from a circuit board and comprises the measurement and/or operating circuit 22, 26.

[0079] FIG. 3 shows two views of the embodiment of the front body 5 according to the invention mounted on the end face 4 of a housing 3. The housing 3 has a cylindrical basic shape. The housing 3 can be cast with a casting compound for affixing the field system. The front body 5 of the embodiment shown has a measurement electrode arrangement 6 with two measurement electrodes 23, 24 lying along a diameter of the front body 5. The front body 5 is pressed in a medium-sealing manner into the housing 3 or, with a seal, is arranged, in particular pressed, in a medium-tight manner.

[0080] FIG. 4 shows a magnetically-inductive flow meter 1 according to the invention installed in a pipeline 2. A transmitter with an evaluation circuit 34 and a transmitting unit 35 is connected to the magnetically-inductive flow meter 1. Optionally, the transmitter can have a display 36.

[0081] FIG. 5 shows a flowchart of an embodiment of the method according to the invention for producing the field system, with the following method steps:

[0082] Providing a core and a mold cavity, wherein the mold cavity has a receptacle for in each case one of the contacting bodies.

Arranging the contacting bodies in the respective receptacles, wherein the contacting bodies are either preformed, partially preformed, or bent into the final shape when the core is being inserted into the mold cavity.
Forming a cavity between core and mold cavity by bringing together the core and the mold cavity;
Filling the cavity and enclosing the contacting body in a casting compound forming the front body and the coil arrangement carriers, in particular by an injection-molding process; and
Curing the casting compound;
Winding the coil wire onto the first section of the first contacting body;
Winding the coil wire around the coil arrangement carrier along a first direction substantially parallel to the longitudinal axis of the coil arrangement carrier;
Winding the coil wire around the coil arrangement carrier along a second direction which is oriented opposite to the first direction;
Winding the coil wire onto the first section of the second contacting body.

[0083] According to a further embodiment, the first contacting body and/or the second contacting body is shaped into a final state by means of bend-forming when the core and the mold cavity are brought together, wherein, in the final state, the longitudinal axis in the first section of the first contacting body in the cross-sectional plane of the coil arrangement carrier runs substantially perpendicular to the longitudinal axis of the coil arrangement carrier, and the longitudinal axis of the third section of the first contacting body runs substantially parallel to the longitudinal axis of the coil arrangement carrier.

LIST OF REFERENCE SIGNS

[0084] 1 Magnetically-inductive flow meter [0085] 2 Pipeline [0086] 3 Housing [0087] 4 Front side [0088] 5 Front body [0089] 6 Measurement electrode arrangement [0090] 7 Field system [0091] 8 Coil arrangement [0092] 9 Coil arrangement carrier [0093] 10 Coil wire [0094] 11 First contacting body [0095] 12 Second contacting body [0096] 15 First section [0097] 16 Longitudinal axis of the first section [0098] 18 Longitudinal axis of the coil arrangement carrier [0099] 19 Second section [0100] 20 Longitudinal axis of the second section [0101] 21 Third section [0102] 22 Operating circuit [0103] 23 Measurement electrode [0104] 24 Measurement electrode [0105] 25 End section of a measurement electrode [0106] 26 Measurement circuit [0107] 27 Contacting device [0108] 28 Longitudinal axis of the third section [0109] 29 Field return [0110] 30 Coil core [0111] 31 Contact terminal [0112] 32 Center piece [0113] 33 Longitudinal axis of the measurement electrode [0114] 34 Evaluation circuit [0115] 35 Transmitting unit [0116] 36 Display