CN204963918U - Electromagnetic flow sensor - Google Patents

Electromagnetic flow sensor Download PDF

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Publication number
CN204963918U
CN204963918U CN201520335602.2U CN201520335602U CN204963918U CN 204963918 U CN204963918 U CN 204963918U CN 201520335602 U CN201520335602 U CN 201520335602U CN 204963918 U CN204963918 U CN 204963918U
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Prior art keywords
electrode
measuring channel
electromagnetic flow
embedded measurement
flow transducer
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CN201520335602.2U
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姜跃炜
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姜跃炜
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Abstract

The utility model belongs to electric -magnetic flow meter measures the field, concretely relates to electromagnetic flow sensor, including measuring channel (10) that non -magnetic metal made, fix at the inside seal part of adoption of measuring channel (10) and set up embedded measurement element (20) that an insulating material made, embedded measurement element (20) have fluid passage (24) that supply the fluid flow to cross, are provided with a pair of response electrode (21) and excitation construction package (22) around it, just length weak point in measuring channel (10) of embedded measurement element (20). The utility model discloses simple structure, thus the distance that can show between two magnetic pole pieces that reduce the excitation construction package reduces the consumption, and non -magnetic metal pipeline not only material intensity height can also provide better magnetic screen effect, simplifies electric -magnetic flow meter and the cost is reduced, in addition the utility model discloses exposed metal area increases as far as possible in making the pipeline, makes its direct and measured flow physical contact, plays telluric electricity field's effect, reaches the interference elimination, increases electric -magnetic flow meter's factor of safety's purpose.

Description

A kind of electromagnetic flow transducer
Technical field
The utility model belongs to flow metering field, is specifically related to a kind of electromagnetic flow transducer.
Background technology
Electromagnetic flowmeter (ElectromagneticFlowmeter) is used for measuring conductive liquid, the such as measurement instrument of electrolytic liquid, liquid metal equal-volume flow according to Faraday's electromagnetic induction law.Wherein the element of most critical is exactly electromagnetic sensor, the design concept of electromagnetic sensor is in the applying magnetic field, both sides measuring pipeline section, detected fluid medium is by cutting magnetic line during measurement pipeline section, measure on pipeline section and the electrode in vertical and magnetic line of force direction produces induction electromotive force being arranged on, the size of described induction electromotive force is proportional to rate of flow of fluid, then carries out integration to the time and can obtain fluid flow.
Electromagnetic flow transducer in the market adopts the mode of coil magnetization mostly, such as electromagnetic flow transducer disclosed in CN102538882A is all outside measuring channel, arrange two field coils, measuring channel inserts induction electrode, exciting current is applied to field coil, flow electric signal is obtained, as shown in Figure 5 from induction electrode.The distance existed in such electromagnetic flow transducer between field coil is comparatively large, and energy consumption is higher, and the technical matters of the Magnetic Shielding Effectiveness that can not provide.
In addition on the one hand, inside is had to the metal electric magnetic flowmeter of insulating resin or plastic material liner, need to arrange ground-electrode wherein, by ground loop and instrument flange ground connection, make itself and ground equipotential, to eliminate interference and trouble free service after the fluid pipe of all kinds of material can be mounted to arbitrarily.In order to simplify its structure, disclosing the area reducing insulated liner layer in patent publication No. CN101430215A, making the exposed metal/bare metal of metal measuring channel inner peripheral surface, directly contact with fluid and used by as ground-electrode.The both ends of metal tube are formed teat by this patent, thus realize the area of increase bare metal as far as possible and prevent the electromotive force on induction electrode from revealing to the object in bare metal portion, but this structure certainly will will increase the casting difficulty of metallic conduit, as shown in Figure 6.
Summary of the invention
In order to solve the problem, the purpose of this utility model be to provide a kind of super low-power consumption, can magnetic shielding, safety and the simple electromagnetic flow transducer of structure.
For realizing above object, the technical solution adopted in the utility model is: a kind of electromagnetic flow transducer, comprise the measuring channel 10 that nonmagnetic metal is made, seal member is adopted to be fixedly installed the embedded measurement components 20 that an insulating material makes in measuring channel 10 inside, described embedded measurement components 20 has a fluid passage 24 flow through for fluid, around the fluid passage 24 a pair induction electrode 21 and excitation structure assembly 22 being arranged on embedded measurement components.
Preferably, described embedded measurement components 20 be shorter in length than measuring channel 10.
Preferably, the pole piece 222 that described excitation structure assembly 22 is made by field coil 221 and soft magnetic material forms.
Preferably, described fluid passage 24 is square at the radial cross-section of magnetic field and electrode in-scope, and described excitation structure assembly is symmetricly set on it comparatively outside minor face both sides, and described induction electrode is arranged on the both sides of its longer sides.
Preferably, described induction electrode can be plug-in electrode or capacitive electrode.
Preferably, described embedded measurement components 20 also has the inductive coil or Hall element that detect magnetic field size, be arranged in magnetic field range.
Preferably; described seal member is be arranged on the O-ring seal 23 that embedded measurement components 20 arranges on the seal groove of two outer circumferential sides in measuring channel direction; O-ring seal 23 and metal measuring channel 10 close contact, guard electrode and excitation structure assembly be not by fluid cutting.
Preferably, electrode circuit hole 11 is offered in the position corresponding to induction electrode at measuring channel 10; Excitation wires hole 12 is offered in the position corresponding to field coil; After assembling by electrode circuit hole 11 or excitation wires hole 12 to the sealed colloid being wherein filled with protection and fixing induction electrode 21 and excitation structure assembly 22.
The beneficial effects of the utility model are:
1) measure pipeline section interpolation at nonmagnetic metal and enter the embedded measurement components of isolation material as electromagnetic flow transducer, and electrode and excitation structure assembly are arranged on embedded measurement components, not only structure is simple, and the distance between two pole pieces that significantly can reduce excitation structure assembly, thus reduction power consumption, extend the serviceable life of electromagnetic flowmeter;
2) nonmagnetic metal measuring tube is adopted, such as stainless steel surrounds excitation structure assembly on embedded measurement components and electrode as external pipe, not only Material Strength is high can also provide good Magnetic Shielding Effectiveness, do not need to arrange magnet shielding structure in addition, simplify electromagnetic flowmeter and reduce its cost;
3) length of embedded measurement components is arranged to the length being shorter than nonmagnetic metal measuring channel, and the electrode on embedded measurement components does not contact with metallic conduit with excitation structure assembly.Compared with documents, the utility model not increasing the casting difficulty of metallic conduit, precondition that on electrode, electromotive force is revealed can not be caused under, bare metal area in pipeline is increased as far as possible, make its direct and measurement fluid contact, play the effect of ground-electrode, reach and eliminate interference, increase the object of the safety coefficient of electromagnetic flowmeter.
Accompanying drawing explanation
Fig. 1 is that the utility model spatial structure partly cuts open figure;
Fig. 2 is that the utility model is along the side view on measuring channel direction;
Fig. 3 is the cut-open view along A-A direction in Fig. 2;
Fig. 4 is the utility model spatial structure wiring layout;
Fig. 5 is prior art structural representation;
Fig. 6 is prior art structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
See Fig. 1, a kind of electromagnetic flow transducer, comprises the measuring channel 10 adopting nonmagnetic metal to make, and adopts the measuring channel of metal material can provide higher physical strength.
Key of the present utility model is: adopt seal member to be fixedly installed the embedded measurement components 20 that an insulating material makes in measuring channel 10 inside, described embedded measurement components 20 has a fluid passage 24 flow through for fluid, and a pair induction electrode 21 and excitation structure assembly 22 are arranged on fluid passage 24 around.
Measure pipeline section interpolation at nonmagnetic metal and enter the embedded measurement components of isolation material as electromagnetic flow transducer, and electrode and excitation structure assembly are arranged on embedded measurement components, not only structure is simple, and compared with the structure external with traditional excitation structure assembly, distance between two pole pieces that significantly can reduce excitation structure assembly, thus reduction power consumption, extend the serviceable life of electromagnetic flowmeter.
In addition, adopt nonmagnetic metal measuring tube, such as stainless steel surrounds excitation structure assembly on embedded measurement components and electrode as externally measured pipeline, not only Material Strength is high can also provide good Magnetic Shielding Effectiveness, do not need to arrange magnet shielding structure in addition, simplify electromagnetic flowmeter and reduce its cost.
Preferably, described embedded measurement components 20 be shorter in length than measuring channel 10, and be preferably less than 1/3 of metal measuring channel length, as shown in figures 1 and 3.The length of embedded measurement components is arranged to the length being shorter than nonmagnetic metal measuring channel, and the electrode on embedded measurement components does not contact with metallic conduit with excitation structure assembly.Compared with the contrast patent CN101430215A mentioned in present context technology, the utility model not increasing the casting difficulty of metallic conduit, precondition that on electrode, electromotive force is revealed can not be caused under, bare metal area in pipeline is increased as far as possible, make its direct and measurement fluid contact, play the effect of ground-electrode, reach and eliminate interference, increase the object of the safety coefficient of electromagnetic flowmeter.
Preferably, described excitation structure assembly 22 is made up of field coil 221 and the soft magnetic material pole piece 222 that such as electric steel plate makes.Relative to traditional field coil, adopt the mode of residual magnetism excitation can reduce excitation power consumption further, extend the electromagnetic flowmeter life-span.
Preferably, described fluid passage 24 is square at the radial cross-section of magnetic field and electrode in-scope, can also be other band arc-shaped edges or trimming square certainly, as shown in Figure 2.The pole piece 222 of described excitation structure assembly is symmetricly set on it comparatively outside minor face both sides, described a pair induction electrode 21 is arranged on the both sides of its longer sides, described induction electrode can be plug-in electrode or capacitive electrode.Wherein, the fluid line of square cross section can reduce the distance between two pole pieces further, under the magnetic field intensity condition that maintenance is identical, can effectively reduce power consumption.
Further, described embedded measurement components 20 also having the wafers such as the inductive coil that detects magnetic field size or Hall element, be arranged in magnetic field range, can be specifically between one of them and fluid passage 24 of pole piece 222.The characteristic of inductive coil is its surface to insert in magnetic field perpendicular to magnetic direction, along with the change in magnetic field can produce induction current, and the characteristic of the semiconductor devices such as Hall element is its surface to insert in magnetic field perpendicular to magnetic direction, it is passed into a certain size electric current, then motional electromotive force will be produced on the direction perpendicular to magnetic direction and direction of current, when passing into size of current and being constant, this electromotive force size is directly proportional to the magnetic field size in region.Induction current or motional electromotive force can both reflect the magnetic field size and situation of change inserted wherein in a word, therefore play the effect of monitored area internal magnetic field intensity, for subsequent conditioning circuit regulates magnetic field size to provide data foundation.
Preferably; described seal member is be arranged on the O-ring seal 23 that embedded measurement components 20 arranges on the seal groove of two outer circumferential sides in measuring channel direction; O-ring seal 23 and metal measuring channel close contact, guard electrode and excitation structure assembly be not by fluid cutting.
Preferably, electrode circuit hole 11 is offered in the position corresponding to induction electrode 21 at measuring channel 10; Excitation wires hole 12 is offered in the position corresponding to field coil.
As shown in Figure 4, installation process of the present utility model is: a pair induction electrode 21 and excitation structure assembly 22 are mounted to the relevant position on embedded measurement components 20, O-ring seal 23 is installed in the seal groove position at embedded measurement components 20 two ends, again the embedded measurement components 20 assembled is inserted the precalculated position in metal measuring channel 10, after the extension line of electrode 21 and field coil 221 is extracted out by electrode circuit hole 11 and excitation wires hole by electrode circuit hole 11 or excitation wires hole 12 to the sealed colloid being wherein filled with protection and fixing induction electrode 21 and excitation structure assembly 22.The extension line of electrode and field coil is drawn by different ducts, can prevent excitation and motor powered gesture signal from producing interference, affect measuring accuracy.
In a word, above-mentioned embodiment can not summarize the utility model completely, also there is various deformation mode in theory, and therefore, protection domain of the present utility model is as the criterion with claim.

Claims (8)

1. an electromagnetic flow transducer, comprise the measuring channel (10) that nonmagnetic metal is made, it is characterized in that: adopt seal member to be fixedly installed the embedded measurement components (20) that an insulating material makes in measuring channel (10) inside, described embedded measurement components (20) has a fluid passage (24) flow through for fluid, a pair induction electrode (21) and excitation structure assembly (22) is arranged on around the fluid passage (24) on embedded measurement components.
2. a kind of electromagnetic flow transducer according to claim 1, is characterized in that: described embedded measurement components (20) be shorter in length than measuring channel (10).
3. a kind of electromagnetic flow transducer according to claim 1 and 2, is characterized in that: described induction electrode can be plug-in electrode or capacitive electrode.
4. a kind of electromagnetic flow transducer according to claim 1 and 2, is characterized in that: the pole piece (222) that described excitation structure assembly (22) is made by field coil (221) and soft magnetic material forms.
5. a kind of electromagnetic flow transducer according to claim 1 and 2; it is characterized in that: the O-ring seal (23) that described seal member is arranged on the seal groove of two outer circumferential sides in measuring channel direction for being arranged on embedded measurement components (20); O-ring seal (23) and metal measuring channel close contact, protection induction electrode (21) and excitation structure assembly (22) be not by fluid cutting.
6. a kind of electromagnetic flow transducer according to claim 1 and 2, it is characterized in that: described fluid passage (24) are square at the radial cross-section of magnetic field and electrode in-scope, described excitation structure assembly is symmetricly set on it comparatively outside minor face both sides, and described induction electrode is arranged on the both sides of its longer sides.
7. electromagnetic flow transducer according to claim 1 and 2, is characterized in that: described embedded measurement components (20) is also provided with the inductive coil or Hall element that detect magnetic field size, is arranged in magnetic field range.
8. electromagnetic flow transducer according to claim 1 and 2, is characterized in that: offer electrode circuit hole (11) at measuring channel (10) corresponding to the position of induction electrode; Excitation wires hole (12) is offered in the position corresponding to excitation structure assembly; Protect by circuit hole, electrode circuit hole (11) or excitation wires hole (12) being wherein filled with and fixing the sealed colloid of induction electrode (21) and excitation structure assembly (22) after assembling.
CN201520335602.2U 2015-05-22 2015-05-22 Electromagnetic flow sensor Active CN204963918U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520335602.2U CN204963918U (en) 2015-05-22 2015-05-22 Electromagnetic flow sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520335602.2U CN204963918U (en) 2015-05-22 2015-05-22 Electromagnetic flow sensor

Publications (1)

Publication Number Publication Date
CN204963918U true CN204963918U (en) 2016-01-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111307230A (en) * 2020-03-02 2020-06-19 西门子传感器与通讯有限公司 Electromagnetic flowmeter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111307230A (en) * 2020-03-02 2020-06-19 西门子传感器与通讯有限公司 Electromagnetic flowmeter

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