CN205898733U - Capacitive sensor and measurement system - Google Patents

Abstract

The utility model provides a capacitive sensor and measurement system. Capacitive sensor includes hose, multiple coils unit and stranded sensor data line, the hose is insulating material, it is in to fix the setting to multiple coils unit interval on the hose, each coil section is the coil of electrically conductive material, heliciform coiling, each coil section is connected to the one end one -to -one of each strand sensor data line, and the other end is used for connecting outside data acquisition system. Measurement system is including sensor and data acquisition system, the sensor is for as above capacitive sensor, capacitive sensor cover is established on measurement system institute measuring pipeline, capacitive sensor's sensor data line is connected data acquisition system. The utility model discloses a capacitive sensor and measurement system, when capacitive sensor was used for measurement system three -dimensional imaging, the sampling rate was high, and the image reconstruction effect is better.

Description

A kind of capacitance sensor and measuring system

[technical field]

This utility model is related to sensor component, more particularly to a kind of capacitance sensor and measuring system.

[background technology]

Solution-air, gas-solid multiphase flow are oil, chemical industry, common flow media in coal industry, and it mainly comprises liquid Hydrocarbon, natural gas, oxygen, mineralized water or coal etc..Solution-air, gas-solid three-dimensional online fluidized-bed furnace measurement are always oil and gas industry In important step, it is significant to the optimal control of industrial process.Concrete measurement scene, for instance that chemical industry, coal Fluidized-bed furnace during gas and solid dielectric combustion reaction in the recirculating fluidized bed in field, in food, pharmacy coating process The gas-solid distribution of recirculating fluidized bed, during oil exploitation the gas-liquid distribution of oil-gas-water multiphase fluidised form visualization measurement.

Capacitance chromatography imaging (electrical capacitance tomography) is solution-air, the survey of gas-solid multiphase flow The important method of amount.It relies on the array electrode a series of measurement capacitance of acquisition being arranged in tested field domain border, and utilizes In measurement capacitance and tested field domain, the electromagnetic field variation relation between the distribution of equivalent point electric constant carries out the image reconstruction in flow field, Obtain the distribution of medium in tested field domain, realize visualization.According to visualization result, gas liquid ratio, the gas of fluid can be calculated Gu than.At present, the sectional view of existing capacitance imaging sensor is as shown in figure 1, paste respectively along along the circumferencial direction of pipeline 300 Fixing multiple pellet electrodes 100, such as 8 or 16 electrodes.In figure show 12 electrodes of settingSituation.Adjacent It is equivalent to an electric capacity between two electrodes, for example, between first electrode and second electrode, be equivalent to electric capacity c12.In pipeline 300 Periphery one layer of screen layer 400 is set again, pipeline 300 internal circulation is measured fluid media (medium) 900.As only arranged 1 circle, The section flow measurement information (cross-sectional area) that along in cross-wise direction (x-y direction) can only be obtained is it is impossible to obtain Information on pipe longitudinal axis direction (z direction), (great majority are so cannot to realize the three-dimensional imaging of convection cell distribution well Two tangent plane imaging measurements).For this reason, being usually that setting multi-turn electrode is increased on the y direction of pipeline, enclose 12 electricity from 1 Pole increases encloses 36 for 3, or 48,4 circles, and the rest may be inferred.So, after extracting the information on three-dimensional, can be used for realizing three Dimension imaging.However, when the capacitance sensor of this structure is used for measuring system imaging, the sampling rate that there is system is low, image weight Build the problem of effect difference.

[utility model content]

Technical problem to be solved in the utility model is: makes up above-mentioned the deficiencies in the prior art, proposes a kind of electric capacity and pass Sensor and measuring system, when capacitance sensor is used for measuring system three-dimensional imaging, sampling rate is high, and image reconstruction effect is preferable.

Technical problem of the present utility model is solved by following technical scheme:

A kind of capacitance sensor, including flexible pipe, multiple coil unit and multiply sensor data cable；Described flexible pipe is insulation Material；Multiple coil unit compartment of terrains are fixedly installed on described flexible pipe；Each coil unit be conductive material, helical form around The coil of system；One end of each stock sensor data cable connects one to one each coil unit, and the other end is used for connecting outside Data collecting system.

Preferably in technical scheme,

The material of described coil unit is metal.

In further preferred technical scheme,

Described coil unit is helical form, has resilient coil, and the two ends of described coil are passed through described in snap ring is fixed on On flexible pipe.

Described coil unit is metal spring.

The spiral number of turns of the coil in described coil unit are no less than 5 circles.

Described flexible pipe is nonmetallic isolation material.

A kind of measuring system, including sensor data acquisition system；Described sensor is capacitance sensing as above Device, described capacitance sensor is set on the pipeline measured by measuring system, and the sensor data cable of described capacitance sensor is even Connect described data collecting system.

In described pipeline, the medium of flowing is the mixture of gas and liquid, or the mixture for gas and solid.

The beneficial effect that this utility model is compared with the prior art is:

Capacitance sensor of the present utility model, the multiple spiral helicine coil of interval setting, each coil along along a flexible pipe Unit is equivalent to an electrode, thus can be in the case of coil (i.e. electrode) is total less, based on spiral on y direction It is arranged with the displacement of electrode such that it is able to obtain the three-dimensional information of fluid.By helical spiral design, the electrode number of plies is in spiral stairses Shape adds up, so can in close approximation existing structure multiple (circle) electrode three-dimensional measurement effect, present fluid three-dimensional become Picture.This utility model utilizes a small amount of electrode (12-16) so that it may realize to the solution-air in the pipeline of a segment length, gas-solid flow Multiple electrodes are set in the 3D image reconstruction of body medium, and equivalent existing scheme in the same section of pipeline and a segment length Imaging effect.Because, during measurement imaging, the electrodeplate being related to is less, and therefore the sampling rate of system is high.Meanwhile, capacitance measurement fortune Calculation amount is relatively low, then the singular value of capacitance sensitivity field (sensitivity-map) is less, and the image reconstruction effect of ect is preferable.This reality When being used in measuring system with new capacitance sensor, achievable sensor is separated freely with tested pipeline, and sensor In arrying main body be soft pipeline, therefore do not limited by detected fluid pipe diameter size, being set in of adaptability is to be measured Fluid line on.Capacitance sensor can be by personnel according to practical application request, flexibly setting flexible pipe bore and coil unit Quantity, arranges freedom and flexibility.

[brief description]

Fig. 1 is the cross section structure schematic diagram of capacitance sensor of the prior art；

Fig. 2 is the perspective view of the capacitance sensor of this utility model specific embodiment；

Fig. 3 is the generalized section of the capacitance sensor of this utility model specific embodiment along y direction；

Fig. 4 be this utility model specific embodiment capacitance sensor in single coil unit generalized section；

Fig. 5 is that the capacitance sensor of this utility model specific embodiment is set in the view on measurement pipeline.

[specific embodiment]

With reference to specific embodiment and compare accompanying drawing this utility model is described in further details.

Design of the present utility model is, due to multiple pellet electrodes peripherally disposed in existing capacitance sensor, Axially simultaneously direction setting multi-turn, so, on the one hand leads to the sum of electrode more, thus reducing the sampling speed of system Rate.On the other hand, electrode sum is more, and capacitance measurement operand is larger, also results in capacitance sensitivity field (sensitivity- Map singular value) increases, thus affecting the image reconstruction effect of ect.For this reason, this utility model improves electricity in capacitance sensor The structure of pole and its arranged state, are improved to the conductive coil of helical form coiling arrangement by single pellet electrode；By multiple Electrode along the circumferential direction arranges a circle, and axially disposed multi-turn is improved to the multiple spiral windings of axially spaced setting, finally real Existing 3D image reconstruction, and be to realize 3D image reconstruction in the case of less electrodeplate, thus solving to adopt in existing scheme Sample speed and the problem of image reconstruction effect aspect.

As shown in figs. 2 to 4, the capacitance sensor of this specific embodiment includes flexible pipe 1, multiple coil unit 2 and multiply Sensor data cable 5.Flexible pipe is isolation material, specifically, can be nonmetallic isolation material, such as soft rubber pipe.Multiple Coil unit compartment of terrain is fixedly installed on flexible pipe 1.Each coil unit 2 is conductive material, the coil of helical form coiling.Respectively One end of stock sensor data cable 500 connects one to one each coil unit 2, and the other end is used for connecting the data acquisition of outside System.Shown in Fig. 3, the other end of each stock sensor data cable 5 pools together, and draws from same one end of flexible pipe 1.

Specifically, coil unit 2 can be wire coil.Preferably, coil unit 2 is spiral helicine elastomer, for example gold Belong to spring.As shown in figure 4, the two ends of elastomer 201 are fixed on flexible pipe 1 by two snap rings 202,203.So, each Coil unit (namely elastomer), as an electrode, can tackle answer produced when flexible pipe is in longitudinal stretching well Power and deformation.Specifically, elastomer can produce along longitudinal direction (direction of fluids within pipes media flow) stretching or when compressing with flexible pipe 1 Raw deformation and stress.When flexible pipe 1 stretches, helical form elastomer (electrode) be stretched therewith elongated, when flexible pipe 1 compresses, spiral shell Rotation shape elastomer (electrode) is compressed therewith.The deformation that it produces is constant because girth, will not be to equivalent capacitance value during measurement Produce error impact, also can take into account well simultaneously and solve flexible the brought Layout Problem of flexible hose.

In this specific embodiment, also provide a kind of measuring system, including data collecting system and electric capacity as above Sensor.Capacitance sensor is set on the pipeline measured by measuring system, and the sensor data cable of capacitance sensor connects number According to acquisition system.

As shown in figure 5, capacitance sensor is set on the pipeline 7 measured by measuring system.The medium of flowing in pipeline 7 Can be the mixture of gas and liquid, or the mixture for gas and solid, such as pipeline can be petroleum pipeline, coal mining Transport pipeline, pipeline in the recirculating fluidized bed in chemical industry, food, pharmacy coating process.

Specifically, the flexible pipe 1 of capacitance sensor is enclosed within measurement pipeline 7, and spiral winding unit 2 and flexible pipe 1 are one, Therefore also random interval distribution is wound in measurement pipeline 7 outer wall to spiral winding unit 2.A coil is only illustrated shown in Fig. 5 The conduit region that unit 2 is located, does not illustrate the coil unit at the place that is spaced a distance and corresponding conduit region.In flexible pipe 1 The sensor data cable in portion connects the data collecting system of measuring system.During measurement, in capacitance sensor, flexible pipe 1 is disposed with The electrode of coil unit 2, as sensor, each coil unit 2 is as an absolute electrode.Two neighboring coil unit 2 Respectively as two absolute electrodes (for example, be equivalent to electrode 1., 2.) in traditional scheme Fig. 1, one of as excitation electricity Pole, another is equivalent to a capacitance as measuring electrode.When multiple coil units (electrode) are disposed with flexible pipe 1, lead to Overdrive one of, measuring remaining electrode, multiple equivalent capacitance value being obtained, thus building 3-D view.

It is further preferred that the spiral number of turns of each coil unit 2 are no less than 5 circles.So, the relatively large number of number of turns, Can ensure that the tensile ductility of whole spiral winding.Additionally, more spiral number of turns, be equivalent to equivalent increase electrode overall length, that is, Increased the measured value of equivalent capacity, thus measurement signal to noise ratio can be improved.

The capacitance sensor of this specific embodiment relies on a small amount of spiral winding, namely a small amount of electrode, such as 12～ 16, you can realize the 3D image reconstruction of the flow media in the pipeline in a segment length.Due to, during measurement imaging, being related to Electrodeplate is less, and therefore the sampling rate of system is high.Meanwhile, capacitance measurement operand is relatively low, then capacitance sensitivity field (sensitivity-map) singular value is less, and the image reconstruction effect of ect is preferable.The capacitance sensing of this specific embodiment Device can be applicable in the multiphase flow measurement of oil, chemical process.

The distribution of electrodes of the capacitance sensor of the ect of this specific embodiment on soft pipeline, unitary design.Flexible pipe It is wrapped in fluid line outer wall, coil unit is spaced apart, each coil unit is all distributed in the shape of a spiral.First, using spiral Distribution, can achieve merely with a small amount of electrode, the measurement of multi-turn ect distribution of electrodes and three-dimensional imaging effect in close approximation existing scheme Really.Second, the electrode that this specific embodiment is realized based on flexible pipe can be dismantled freely, and flexible pipe can be set in other of different bores On fluid pipeline section, for fluid media (medium) measurement.3rd, flexible pipe arbitrarily can stretch at longitudinal direction (flow direction), can be according to measurement need Will, realize the change freely of interelectrode distance, thus controlling the distribution of ect sensitivity field and sensing step-length in 3D image reconstruction (sensing penetration depth).

Above content be with reference to specific preferred implementation further detailed description of the utility model it is impossible to Identification is of the present utility model to be embodied as being confined to these explanations.Ordinary skill for this utility model art For personnel, make some replacements or obvious modification without departing from the concept of the premise utility, and performance or purposes Identical, all should be considered as belonging to protection domain of the present utility model.

Claims (8)

1. a kind of capacitance sensor it is characterised in that: include flexible pipe, multiple coil unit and multiply sensor data cable；Described Flexible pipe is isolation material；Multiple coil unit compartment of terrains are fixedly installed on described flexible pipe；Each coil unit is conduction material Matter, the coil of helical form coiling；One end of each stock sensor data cable connects one to one each coil unit, and the other end is used for Data collecting system outside connecting.

2. capacitance sensor according to claim 1 it is characterised in that: the material of described coil unit be metal.

3. capacitance sensor according to claim 1 it is characterised in that: described coil unit be helical form, there is elasticity Coil, the two ends of described coil are fixed on described flexible pipe by snap ring.

4. capacitance sensor according to claim 1 it is characterised in that: described coil unit be metal spring.

5. capacitance sensor according to claim 1 it is characterised in that: the spiral number of turns of the coil in described coil unit It is no less than 5 circles.

6. capacitance sensor according to claim 1 it is characterised in that: described flexible pipe is nonmetallic isolation material.

7. a kind of measuring system, including sensor data acquisition system；It is characterized in that: described sensor is as claim Capacitance sensor described in 1～6 any one, described capacitance sensor is set on the pipeline measured by measuring system, described electricity The sensor data cable holding sensor connects described data collecting system.

8. measuring system according to claim 7 it is characterised in that: in described pipeline flowing medium be gas and liquid Mixture, or the mixture for gas and solid.