CN2563550Y - Combined electrode type displacement measuring sensor - Google Patents

Abstract

The utility model discloses a combined electrode type displacement measuring sensor which is made by connecting a shell, a metal bottom board, a metal insulating board, a metal insulating enclosure, variable measuring electrodes, fixed measuring electrodes, guide sleeves, displacement levers; each group of variable measuring electrodes and fixed measuring electrodes are respectively composed of two measuring electrodes, and a gap is maintained between the two measuring electrodes; the number of the groups of the variable measuring electrodes and the fixed measuring electrodes can be freely combined and changed according to different measuring demands, and then according to the group number of variable measuring electrodes, the number of the guide sleeves and the displacement levers are evenly arranged. The sensor connects the displacement levers with the objects to be measured when installed and used, a measuring cable is connected with a displacement measuring device for measuring the vertical displacement or the horizontal displacement of the object to be measured. The utility model is of good measuring linearity, wide measuring area, high measuring accuracy, stable and reliable measured value, and smaller size.

Description

Compound electrode formula displacement measurement sensor

Technical field

The utility model relates to the device that measures its movable length when a kind of method that adopts electric capacity is exclusively used in movement of objects, specifically is meant a kind of compound electrode formula displacement measurement sensor.

Background technology

According to the Patent data verification, a kind of displacement measurement capacitive transducer and a kind of capacitance sensing liquid level tester are arranged at present, the latter is the specific embodiment that the former is used for level gauging.Therefrom as can be known, when shielded-plate tube is done axial displacement in the ring electrode of back, capacitance changes, because of its former and later two ring electrodes that are used to measure, a shared central electrode of while, in the ring electrode when mobile, electric capacity produces capacitance variation to a certain degree to shielded-plate tube before also will causing, is non-linear so cause it to measure on length in the back.Therefore looking accuracy requirement, can only to get a segment length be measurement range, makes also that simultaneously structural volume is big, and be difficult to satisfy high-precision displacement measurement requirement.

Summary of the invention

The purpose of this utility model, be in order to solve the problem that the linearity is bad, measurement range is little, measuring accuracy is not high and structural volume is big that existing displacement measurement capacitive transducer exists, the compound electrode formula that a kind of linearity is good, measurement range is big, measuring accuracy is high and structural volume is less displacement measurement sensor to be provided.

Solution of the present utility model is as follows.Its structure composition still includes shell, metal base plate, electrode and measurement cable, and its structural feature part is, fixedly be equiped with the metal division board in the enclosure, the outer casing space internal fixation of clamping is equiped with quantity and is at least a plurality of metal spacer sleeves of two between metal division board and metal base plate, in the insulated chamber of the inner formed mutual shielding of a plurality of metal spacer sleeves by this, fixedly be equiped with quantity respectively and be at least the fixation measuring electrode that one group variable potential electrode and quantity are at least a group, and this variable potential electrode is counted sum with the group of this fixation measuring electrode and is equated with the number of metal spacer sleeve, every group of variable potential electrode and every group of fixation measuring electrode in a plurality of insulated chambers are all constituted by two potential electrode at a distance of gapped space respectively, all offer one on the pairing metal base plate in center of the insulated chamber at each fixation measuring electrode place and make the through hole that environmental baseline is consistent between each insulated chamber, on the pairing metal base plate in center of each variable potential electrode place insulated chamber, all offer a through hole and be equiped with an orienting sleeve that stretches to the metal base plate outside at the through hole internal fixation, the displacement bar that is slidingly fitted with orienting sleeve that inserts all in each orienting sleeve that a length adds orienting sleeve length greater than measurement range, on each displacement bar all can stretch in the clearance space between two potential electrode of relevant variable potential electrode under external force, under move freely, cable passes the perforate on shell and the metal division board and is connected with the fixation measuring electrode with the variables corresponding potential electrode.

The utility model with said structure is connected its each displacement bar outer end respectively when installing and using with measured mobile object, the outer end of measuring cable is connected with the displacement electrical measurement.Its course of work is, when each object being measured produces displacement, driving each displacement bar moves axially in the clearance space between two potential electrode of corresponding insulated chamber internal variable potential electrode respectively along the place orienting sleeve, make that respectively organize the variable potential electrode produces corresponding variation by the capacitance that forms between two potential electrode along with the displacement of displacement bar, respectively organize the fixation measuring electrode and then be maintained fixed by the capacitance that forms between two potential electrode and do not change.By measuring the metering circuit in the external electrical measurement of cable, can measure the variation ratio of the capacitance of variable potential electrode, thereby measure the displacement variable of displacement object with respect to the capacitance of fixation measuring electrode.

In the utility model displacement measurement sensor, because each group variable potential electrode and fixation measuring electrode are the insulated chambers that places mutual shielding respectively, so do not have mutual interference phenomenon to take place between each potential electrode, isolated the interference of extraneous strong-electromagnetic field effectively yet.Between each insulated chamber, be positioned at the effect of the through hole of offering on the metal base plate of center, be that the potential electrode of respectively organizing that is installed in the insulated chamber is all remained in the same environmental factor, remove to measure each interelectrode variation ratio, therefore eliminated the influence of environmental factor (as temperature, humidity) measuring.Said structure, make the utility model measuring accuracy height, measurement is reliable and stable, the measure linear degree is good, measure the also corresponding increase of range, its structural volume is also less simultaneously.

The utility model displacement measurement sensor can with the supporting use of static level measuring instrument, the perpendicular displacement (or depression) that is applied to building such as dam, bridge, culvert is measured.Also can be applicable to the precision measurement of the displacement movement of various objects on each planar range.This survey sensor is the continuity displacement measurement, and its Measurement Resolution depends primarily on the resolution of measurement mechanism, can stably reach 100,000/several.

Description of drawings

Fig. 1 is the forward cut-open view of a kind of concrete structure of the utility model;

Fig. 2 is the G-G cut-open view of Fig. 1;

Fig. 3 is an A place enlarged drawing among Fig. 1;

Enforcement structural drawing when Fig. 4 carries out the perpendicular displacement measurement for Fig. 1 the utility model is used for the static level measuring instrument;

Fig. 5 be among Fig. 4 K to view.

Embodiment

Referring to Fig. 1 and Fig. 2.The utility model includes shell 1, metal base plate 10, electrode, measure cable 6, be equiped with metal division board 2 at shell 1 internal fixation, the shell 1 space internal fixation of clamping is equiped with three metal spacer sleeves 3 between metal division board 2 and metal base plate 10,7,16, by these three metal spacer sleeves 3,7, in 16 formed three insulated chambers 17 that shield mutually, fixedly be equiped with one group of variable potential electrode and two groups of fixation measuring electrodes respectively, make the group of this group variable potential electrode and these two groups of fixation measuring electrodes count sum (three groups) and three metal spacer sleeves 3,7,16 quantity equates, one group of variable potential electrode in the insulated chamber 17 of metal spacer sleeve 3 is formed by two less cylindrical potential electrode 5 and bigger annular potential electrode 4 concentric fits of internal diameter of external diameter at a distance of gapped space, one group of fixation measuring electrode in the insulated chamber 17 of metal spacer sleeve 7 is formed by two less cylindrical potential electrode 9 and bigger annular potential electrode 8 concentric fits of internal diameter of external diameter at a distance of gapped space, one group of fixation measuring electrode in the insulated chamber 17 of metal spacer sleeve 16 is formed by two less cylindrical potential electrode 14 and bigger annular potential electrode 15 concentric fits of internal diameter of external diameter at a distance of gapped space, respectively offer a through hole 11 that 17 environmental baselines of insulated chamber are consistent on the pairing metal base plate 10 in center of the fixation measuring electrode place insulated chamber 17 in the metal spacer sleeve 7 and 16, offer a through hole on the pairing metal base plate 10 in center of the variable potential electrode place insulated chamber 17 in metal spacer sleeve 3 and be equiped with an orienting sleeve 12 that stretches to metal base plate 10 outsides at the through hole internal fixation, insert a length in the orienting sleeve 12 and add being slidingly fitted with orienting sleeve 12 and cylindrical displacement bar 13 of orienting sleeve 12 length greater than measurement range, the internal diameter of displacement bar 13 greater than the external diameter of cylindrical potential electrode 5 less than the internal diameter of annular potential electrode 4, on making that displacement bar 13 can stretch in the clearance space between cylindrical potential electrode 5 and the annular potential electrode 4 under external force, under move freely, measure cable 6 pass on shell 1 and the metal division board 2 perforate and with the cylindrical potential electrode 5 of variable potential electrode and the cylindrical potential electrode 9 of annular potential electrode 4 and fixation measuring electrode, 14 and annular potential electrode 8,15 are connected.Two potential electrode of variable potential electrode and fixation measuring also can not made cylindrical and annular shown in Figure 1, and all do slabbing or other shape.

Referring to Fig. 3.Be processed with effective guide surface 18 that two place's xsects all are circular arc contacts with the outside wall surface of displacement bar 13 at the internal face two ends of orienting sleeve 12, can reduce the sliding-frictional resistance between orienting sleeve 12 and the displacement bar 13, successfully carry out displacement along orienting sleeve 12 thereby be convenient to displacement bar 13.

When the utility model is applied to displacement movement on the planar range and measures, link to each other with electrical measurement as long as 13 outer ends of the displacement bar among Fig. 1 and measured mobile object be connected and will measure cable 6.

Referring to Fig. 4 and Fig. 5.When Fig. 1 the utility model matches with the static level measuring instrument when carrying out perpendicular displacement and measuring, then should on Fig. 1 architecture basics, increase corresponding component, promptly be that container alms bowl body 19 with its metal base plate 10 and a carrying liquid is fixedly connected, its displacement bar 13 outer ends link to each other with the float 20 that places alms bowl body 19 interior liquid, the fixedly connected balance bob 21 in float 20 bottoms is in order to keep the vertical movement of displacement bar 13 and float 20.In container alms bowl body 19 bottoms, establish one in order to connecting the liquid mouth of pipe 22 of fluid passage, alms bowl body 19 medium positions are provided with one greater than measurement range, have the form 23 of the artificial observation liquid level of indicating graduation, are used for carrying out artificial measurement of comparison with the electrical measurement value.

A plurality of devices shown in Figure 4 are interconnected and are installed on each measuring point of object being measured by fluid pipeline, when point position produces perpendicular displacement, the liquid level of the liquid of splendid attire changes in the alms bowl body 19, make the float 20 that floats on liquid level drive displacement bar 13, under the effect of guide surface 18, in orienting sleeve 12, move axially.So displacement bar 13 produces displacement in the clearance space of the variable potential electrode that is combined into by potential electrode 5 and potential electrode 4, make by the capacitance variation that forms between potential electrode 5 and the potential electrode 4, the capacitance of two groups of fixation measuring electrodes that are combined into by potential electrode 9 and potential electrode 8 and by potential electrode 14 and potential electrode 15 does not then change respectively, by measuring the metering circuit of cable 6 external electrical measurement, can measure the variation ratio of the capacitance of this variable potential electrode, thereby measure the perpendicular displacement amount of perpendicular displacement object with respect to the capacitance of fixation measuring electrode.By artificial observation form 23, directly read the indicating graduation of liquid level, can obtain the artificial observation value of ohject displacement, can be used to do contrast and measure with automatic measurement.

In Fig. 4, the container alms bowl body 19 of carrying liquid is equidimension, isometric(al) structure, and when a plurality of survey sensor devices were communicated with, the related changing value of each liquid level reached unanimity, and improved measuring accuracy.Potential electrode is the metal material that employing good stability, linear expansion coefficient are little, conduct electricity very well, and the surface all is coated with wraps up in the high insulating material of insulating property.Measurement cable 6 all adopts the high insulating material of insulating property to be coated with and wraps up in after being welded to connect with electrode, is in mutual shielding situation between each line.This survey sensor device can be according to the different requirements of measuring, the group number of independent assortment variable potential electrode and fixation measuring electrode, and according to the group number of variable potential electrode, equivalent is provided with the quantity of orienting sleeve 12 and displacement bar 13, satisfies measurement requirement.Simultaneously the length of fixation measuring electrode can be according to measurement requirement, matches with the variable potential electrode and changes its size, mainly is as the criterion to satisfy measurement requirement.The geometric configuration of potential electrode and size can be random geometry and size, as long as by measurement requirement, satisfy two very one group, and each group all places the conditional requests in the insulated chamber 17 independently to get final product.It then is cylindrical and combination annular herein.Displacement bar 13 bottoms are directly fixed on the bottom of float 20, have so both increased buoyancy, have correspondingly prolonged measurement displacement again.The balance bob 21 that float 20 bottoms are fixedly connected can be according to the buoyancy requirement, balance adjustment, the balance and the perpendicular displacement that keep displacement bar 13.

Claims (3)

1, a kind of compound electrode formula displacement measurement sensor, include shell, metal base plate, electrode and measurement cable, it is characterized in that, fixedly be equiped with the metal division board in the enclosure, the outer casing space internal fixation of clamping is equiped with quantity and is at least a plurality of metal spacer sleeves of two between metal division board and metal base plate, in the insulated chamber of the inner formed mutual shielding of a plurality of metal spacer sleeves by this, fixedly be equiped with quantity respectively and be at least the fixation measuring electrode that one group variable potential electrode and quantity are at least a group, and this variable potential electrode is counted sum with the group of this fixation measuring electrode and is equated with the number of metal spacer sleeve, every group of variable potential electrode and every group of fixation measuring electrode in a plurality of insulated chambers are all constituted by two potential electrode at a distance of gapped space respectively, all offer one on the pairing metal base plate in center of the insulated chamber at each fixation measuring electrode place and make the through hole that environmental baseline is consistent between each insulated chamber, on the pairing metal base plate in center of each variable potential electrode place insulated chamber, all offer a through hole and be equiped with an orienting sleeve that stretches to the metal base plate outside at the through hole internal fixation, the displacement bar that is slidingly fitted with orienting sleeve that inserts all in each orienting sleeve that a length adds orienting sleeve length greater than measurement range, on each displacement bar all can stretch in the clearance space between two potential electrode of relevant variable potential electrode under external force, under move freely, measure cable and pass the perforate on shell and the metal division board and be connected with the fixation measuring electrode with the variables corresponding potential electrode.

2, compound electrode formula displacement measurement sensor according to claim 1 is characterized in that, is processed with effective guide surface that two place's xsects all are circular arc at the internal face two ends of orienting sleeve and contacts with the outside wall surface of displacement bar.

3, compound electrode formula displacement measurement sensor according to claim 1 and 2, it is characterized in that, the container alms bowl body of its metal base plate and a carrying liquid is fixedly connected, its displacement bar outer end with place the alms bowl body in the float of liquid link to each other, the fixedly connected balance bob in float bottom, in container alms bowl body bottom, establish one in order to connecting the liquid mouth of pipe of fluid passage, alms bowl body medium position is provided with one greater than measurement range, has the form of the artificial observation liquid level of indicating graduation.

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