CN109342186A - A kind of LVDT displacement sensor under high temperature and pressure - Google Patents
A kind of LVDT displacement sensor under high temperature and pressure Download PDFInfo
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- CN109342186A CN109342186A CN201811556931.4A CN201811556931A CN109342186A CN 109342186 A CN109342186 A CN 109342186A CN 201811556931 A CN201811556931 A CN 201811556931A CN 109342186 A CN109342186 A CN 109342186A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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Abstract
The invention discloses a kind of LVDT displacement sensors under high temperature and pressure, it includes high temperature and pressure connecting component and displacement detection part, the high temperature and pressure connecting component is axially distributed with displacement detection part and is connected by cylindrical surface positioning threads, high-temperature and high-presure resistent sealing ring one is equipped between high temperature and pressure connecting component and displacement detection part, movable sleeve is connected to cooling jacket in the high temperature and pressure connecting component being close at displacement detection part.It is that one kind can adapt to a variety of media and sample, can be tested under high temperature, high pressure, and measurement accuracy requirement is met, and the displacement sensor easy to use and reliable, maintenance cost is low solves the deficiency of prior art, achieves good effect.
Description
Technical field
The present invention relates to a kind of displacement sensor more particularly to a kind of LVDT displacement sensor under high temperature and pressure,
Belong to material testing apparatus technical field.
Background technique
The mechanics parameters such as elasticity modulus, yield strength, Poisson's ratio, creep rupture strength, breaking strength, most as material
Fundamental physical constant is the basic data of many application studies, is widely used in all trades and professions, as sky is explored in human development
Between to deep space, deeply extend, if deep-sea resources exploitation, Earth look for mine, engineer application is such as super to higher temperature Pressure Development
Supercritical unit, nuclear reactor pressure container etc., the environmental condition faced is harsher, and high temperature and pressure is exactly one of them, as
Research is applied, and material mechanical parameters are indispensability data early period under high temperature and pressure, and data acquisition needs to pass through high temperature and pressure
Under mechanical test.In terms of the data grasped at present, most of experimental studies are only limited to normal temperature and pressure or under high-temperature pressures,
Even if part high temperature and pressure test, temperature, pressure is all relatively low, and the research under real high temperature and pressure extremely lacks, master among these
It wants the reason is that relevant test apparatus lacks and test method limitation, wherein high temperature and pressure displacement sensor shortage is important original
Cause, in terms of data, the experiment porch for the mechanical property under high-temperature and high-pressure conditions include common triaxiality stressh machine and
Homemade special pressure testing machine, these testing equipments measure sensor used, due to the application environment condition being directed to and use
It is required that it is different, specific as follows in place of coming with some shortcomings for high temperature and pressure test:
(1) general triaxiality stressh machine deformation measurement, sensors are deformeter and foil gauge, can measure it is axial and
The various deformations such as radial, are directly to measure using both sensor advantages, measurement data is relatively accurate, but there are sensor peaces
The problems such as reload request is high, lead trouble, link is cumbersome slightly to be will fail without paying attention to test, while for sensor protection, right
Heating pressure medium also has higher requirements, but in the supercritical state, many liquid mediums have extremely strong oxidation corrosion, are
Avoid sensor degradation and short circuit, device cannot be used for the weak corrosive medium such as water, and water, low concentration salt solution, acid-base solution
It is the medium that our earth science researches need, this just greatly limits the use scope of existing equipment；
(2) conventional general triaxiality stressh machine, for being silicone oil to sensor protection heat medium, since burning point limits,
Its heating temperature≤400 DEG C, therefore equipment is lower using temperature；
(3) special pressure testing machine axial strain measurement method is relatively more, but in terms of radial strain measurement, at >=400 DEG C
Under high temperature and pressure, lack good method, mainly lack suitable sensor, can be surveyed by optics in protective gas medium
The methods of amount, but equipment price is higher, simultaneously because influence of the liquid to light, than more serious, the unsuitable liquid of optical measurement is situated between
Matter, medium becomes cloudy during especially testing, and test can not carry out at all, and there is presently no good in the case of liquid medium
Solution traces it to its cause and is mainly also a lack of a kind of sensor for measuring radial deformation at high temperature under high pressure.
Due to above insufficient and real scientific research there is an urgent need to, invent one kind and overcome problem above, it is reliable, simple and practical
Novel sensor very it is necessary to.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of LVDT displacement sensor under high temperature and pressure, it is
One kind can adapt to a variety of media and sample, can be tested under high temperature, high pressure, and measurement accuracy requirement, user are met
It can lean on, the displacement sensor that maintenance cost is low, solve the deficiency of prior art.
The technical solution of the present invention is as follows: a kind of LVDT displacement sensor under high temperature and pressure, it includes high temperature and pressure
Connecting component and displacement detection part, the high temperature and pressure connecting component and displacement detection part are axially distributed and pass through cylinder
The connection of face positioning threads, is equipped with high-temperature and high-presure resistent sealing ring one between high temperature and pressure connecting component and displacement detection part,
Movable sleeve is connected to cooling jacket in the high temperature and pressure connecting component being close at displacement detection part.
The high temperature and pressure connecting component includes positioning pin, kettle plug, nut and metallic O ring, and the kettle plug has for centre
It is connected to the round tube shape structure of cavity body, kettle plug left end outer circle is smooth, cylindrical peripheral surface and the autoclave body mounting hole for being inserted into high temperature and pressure
In, it is pressed abd fixed on autoclave body by covering in the nut of kettle beyond the Great Wall, is equipped with raised flanges, flange left side close to left part in kettle plug
It is bonded with autoclave body wall surface, flange right side is contacted with nut, is equipped with annular groove in flange left side, annular groove is provided with metal O
Shape circle, flange top set dowel hole, there is the positioning pin being fixed on autoclave body in pin hole, and kettle plug right end outer circle is equipped with to be examined with displacement
The cylindrical surface connection external screw thread that component matches is surveyed, cooling jacket is socketed in kettle plug right end outer circle.
The displacement detection part includes coil block, displacement detecting bar assembly, detection bar lockable mechanism；
The coil block includes pressure-bearing inner sleeve, secondary coil one, primary coil, secondary coil two, pressure ring, housing and locking screw
Mother, the pressure-bearing inner sleeve are cylinder-like structure, and the inside of pressure-bearing inner sleeve is equipped with the blind hole that left end opening right part is multi-stage stairs, from
Left-to-right in mating connection with kettle plug and displacement detecting bar assembly respectively, left end inner hole is slidably matched and leads to kettle plug right end outer circle
The sealing of viton seal ring one is crossed, the left side of sealing ring one is equipped with screw thread and is threadedly coupled with kettle plug right end, the secondary coil
One, primary coil, secondary coil two are circular and are from left to right successively sleeved on right section of lateral wall of pressure-bearing inner sleeve, wherein
Secondary coil one and secondary coil two are symmetrically mounted on primary coil two sides, and lead is at differential connection, the socket of coil windings outside
There is a housing, pressure ring loop is in pressure-bearing inner sleeve right end outer circle and is close to two right end of secondary coil, by locking nut by secondary wire
Circle one, primary coil, secondary coil two, pressure ring and housing axial compression are fixed, and locking nut is threaded in pressure-bearing inner sleeve
Right part；
The displacement detecting bar assembly includes extending measuring staff, piston and induction magnetic core and from left to right connecting respectively along axial thread
It connects, extending measuring staff is the elongate rod for being inserted into kettle plug inner cavity, and extension measuring staff left end gauge head is blade-like, and cutting edge connects with sample bus
Touching, section are square, are slidably matched with kettle plug inner hole, and the right end for extending measuring staff is connect with piston thread, and piston is multistage
Stepped cylindrical body, from left to right becomes smaller step by step, and left end major part left end major part cylinder both ends are equipped with 30 ° of chamferings, with pressure-bearing inner sleeve
Inner hole is to be slidably matched, and piston right end microcephaly is threadedly coupled with induction magnetic core, and induction magnetic core is matched with pressure-bearing inner sleeve inner hole for gap
It closes, compressed spring is equipped between piston middle section and pressure-bearing inner sleeve；
The detection bar lockable mechanism is located in the outer circle of pressure-bearing inner sleeve middle section, including pin and lock-nut, and the pin is two
End is that can slide in hole, lock-nut in 4 rod-shaped and positioned at pressure-bearing inner sleeve radial equipartition through-holes of hemispherical cylinder
For annular shape, right end is internal screw thread, and left end is cylindrical hole, is slidably matched with pressure-bearing inner sleeve outer circle, and position is equipped with circular arc among hole
Slot, the symmetrical ring-shaped groove in slot both sides, the built-in high temperature high voltage resistant sealing ring two of groove, when lock-nut rotates clockwise movement
When to left end, pin is located at lock-nut arc groove, and pin can be displaced outwardly space maximum.
The material of the kettle plug is nickel base superalloy GH4698, and the material of nut is nickel base superalloy GH4169.
The pressure-bearing inner sleeve is no magnetic TC4 titanium alloy, and pressure ring, housing and the tight spiral shell mother Zhuo of lock are no stainless steel of magnetic SUS316
At the extension measuring staff and piston are no magnetic TC4 titanium alloy, and induction magnetic core is high-permeability material IJ50, and spring is Ni-based conjunction
Golden material.
Gap between the piston and pressure-bearing inner sleeve inner hole is 0.01~0.03mm, is incuded in the outer circle and pressure-bearing of magnetic core
Covering the gap between inner hole is 0.1~0.3mm.
It is described extend measuring staff left end measuring head and kettle plug be slidably matched between gap be 0.01~0.03mm.
The beneficial effects of the present invention are: compared with prior art, using technical solution of the present invention, effect is as follows:
1, measuring head locking and release function that high temperature and pressure LVDT displacement sensor has general sensor no, it is ensured that sample
Before not starting compression test and fixing, sample does not push displacement or skew by sensor head, causes measurement error even
Test failure.
2, high temperature and pressure LVDT displacement sensor can be avoided effectively slight in sample pressure process when being symmetrically installed
Shake the influence to accuracy of measurement.
3, measuring head, which is designed as blade-like, can effectively avoid weak vibrations in sample pressure process, the variation pair of measurement contact point
The influence of accuracy of measurement.
4, high temperature and pressure LVDT sensor can cooperate as a whole parts with different pressures testing machine, knot
Structure extends to existing triaxial compression test machine, has bigger practical value.
5, this sensor can testing inspection sample it is more various, sample can be metal or nonmetallic.
6, compared with common triaxial compression test machine, the range for testing adaptation is wider, and be adapted to temperature: temperature is higher,
600 DEG C of highest, confining pressure medium is more various, and medium is adapted to the weak erosives liquid such as the indifferent gas such as argon gas and water, due to not
Dedicated deformeter or foil gauge need to be filled, use is easier to be reliable.
7, the device that compression test radial strain measures under high temperature and pressure is used through actual test, and measurement accuracy error reaches
Test requirements document, resolution ratio reach 0.5 μm, and 2 μm of accuracy, easy to use, reliable performance provides one kind for high temperature and pressure test
New means of testing.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is detection bar lockable mechanism structural representation of the present invention；
Fig. 3 is displacement sensor release and retracted mode schematic diagram of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below with reference to this specification attached drawing to this hair
It is bright to be described in further detail.
Embodiment 1: as shown in attached drawing 1~3, a kind of LVDT displacement sensor under high temperature and pressure, it includes high temperature
High pressure connecting component and displacement detection part, the high temperature and pressure connecting component and displacement detection part are axially distributed and pass through
The connection of cylindrical surface positioning threads, is equipped with high-temperature and high-presure resistent sealing ring between high temperature and pressure connecting component and displacement detection part
One 21, movable sleeve is connected to the guarantee electrical component of cooling jacket 5 in the high temperature and pressure connecting component being close at displacement detection part
Normal working temperature.
The high temperature and pressure connecting component includes positioning pin 2, kettle plug 3, nut 4 and metallic O ring 16, and the kettle plug 3 is
There is the round tube shape structure of connection cavity body in centre, and 3 left end outer circle of kettle plug is smooth, cylindrical peripheral surface and the autoclave body for being inserted into high temperature and pressure
It in 25 mounting holes, is pressed abd fixed on autoclave body 25 by covering in the nut 4 on kettle plug 3, is equipped with raised method close to left part in kettle plug 3
Orchid 27,27 left side of flange is bonded with 25 wall surface of autoclave body, and 27 right side of flange is contacted with nut 4, is equipped in 27 left side of flange
Annular groove, annular groove are provided with metallic O ring 16, and 27 top of flange sets dowel hole, is fixed on autoclave body 25 in pin hole
Positioning pin 2,3 right end outer circle of kettle plug, which is equipped with, connect external screw thread with the cylindrical surface that displacement detection part matches, and cooling jacket 5 is socketed
In 3 right end outer circle of kettle plug.
The displacement detection part includes coil block, displacement detecting bar assembly, detection bar lockable mechanism；
The coil block includes pressure-bearing inner sleeve 6, secondary coil 1, primary coil 23, secondary coil 2 24, pressure ring
14, housing 11 and locking nut 13, the pressure-bearing inner sleeve 6 are cylinder-like structure, and it is right that the inside of pressure-bearing inner sleeve 6 is equipped with left end opening
Portion is the blind hole of multi-stage stairs, from left to right in mating connection with kettle plug 3 and displacement detecting bar assembly respectively, left end inner hole and kettle
It fills in 3 right end outer circles to be slidably matched and pass through the sealing of viton seal ring 1, the left side of sealing ring 1 is equipped with screw thread and and kettle
Fill in 3 right ends threaded connection, the secondary coil 1, primary coil 23, secondary coil 2 24 be annular shape and from a left side to
The right side is successively sleeved on 6 right sections of lateral walls of pressure-bearing inner sleeve, and wherein secondary coil 1 and secondary coil 2 24 are symmetrically mounted on just
23 two sides of grade coil, lead are socketed with housing 11 at differential connection, coil windings outside, and 14 loop of pressure ring is right in pressure-bearing inner sleeve 6
In the outer circle of end and it is close to 2 24 right end of secondary coil, by locking nut 13 by secondary coil 1, primary coil 23, secondary wire
It encloses 2 24, pressure ring 14 and 11 axial compression of housing is fixed, locking nut 13 is threaded in the right part of pressure-bearing inner sleeve 6；
The displacement detecting bar assembly includes extending measuring staff 1, piston 9 and induction magnetic core 12 and respectively from left to right along axial thread
Connection, extending measuring staff 1 is the elongate rod for being inserted into 3 inner cavity of kettle plug, and extending 1 left end gauge head of measuring staff is blade-like, cutting edge and sample
The contact of 18 buses, section are square, are slidably matched with 3 inner hole of kettle plug, and the right end for extending measuring staff 1 is threadedly coupled with piston 9,
Piston 9 is multi-stage stairs shape cylindrical body, is from left to right become smaller step by step, and left end major part left end major part cylinder both ends are equipped with 30 ° of chamferings,
It is to be slidably matched with 6 inner hole of pressure-bearing inner sleeve, 9 right end microcephaly of piston is threadedly coupled with induction magnetic core 12, incudes magnetic core 12 and pressure-bearing
6 inner hole of inner sleeve is clearance fit, and compressed spring 10 is equipped between 9 middle section of piston and pressure-bearing inner sleeve 6, guarantees to extend 1 gauge head of measuring staff
It is contacted with sample 18 well, displacement, is transmitted to induction magnetic core by extension measuring staff 1, piston 9 caused by 18 radial deformation of sample
12, movement brings measuring coil change of flux, to cause by primary coil 23, secondary coil 1, secondary coil two
The differential transformer output voltage of 24 compositions changes, and the voltage of output, which changes, is displaced linear corresponding relationship with induction magnetic core 12；
The detection bar lockable mechanism is located in 6 middle section outer circle of pressure-bearing inner sleeve, including pin 8 and lock-nut 7, the pin 8
It is that can be slided in hole in 4 rod-shaped and positioned at 6 radial equipartition of pressure-bearing inner sleeve through-holes of hemispherical cylinder for both ends, when
Pin 8 is pushed by lock-nut 7 when moving into hole, and 6 inner hole of pressure-bearing inner sleeve is become smaller by space, so that it is mobile to limit piston 9,
Reach locking displacement detecting bar assembly purpose, pin 8 is moved radially to be controlled by lock-nut 7, and lock-nut 7 is annular shape, right
End is internal screw thread, and left end is cylindrical hole, is slidably matched with 6 outer circle of pressure-bearing inner sleeve, and position is equipped with arc groove, slot both sides pair among hole
Claim distribution ring-shaped groove, the built-in high temperature high voltage resistant sealing ring 2 15 of groove is moved to left end when lock-nut 7 rotates clockwise
When, pin 8 is located at 7 arc groove of lock-nut, and pin 8 can be displaced outwardly space maximum, the space after expansion, it is ensured that piston
(9) it can move freely, displacement detecting bar assembly discharges completely, otherwise rotation moves right lock-nut 7 counterclockwise, lock-nut
7 arc grooves squeeze pin 8 inside, and inner hole shrinks limitation piston 9 and moves freely, locking measuring rod.
The material of the kettle plug 3 be nickel base superalloy GH4698, nut 4) material be nickel base superalloy GH4169,
Ensure that coupling component is corrosion-resistant in 600 DEG C or more energy and bears high temperature and pressure.
The pressure-bearing inner sleeve 6 is no magnetic TC4 titanium alloy, and pressure ring 14, housing 11 and 13 Zhuo of locking nut are no magnetic SUS316
Stainless steel is made, and the extension measuring staff 1 and piston 9 are no magnetic TC4 titanium alloy, and induction magnetic core 12 is high-permeability material IJ50,
Spring 10 is nickel-bass alloy material.
Gap between 6 inner hole of the piston 9 and pressure-bearing inner sleeve is 0.01~0.03mm, incudes the outer circle of magnetic core 12 and holds
Pressing the gap between 6 inner hole of inner sleeve is 0.1~0.3mm.
It is described extend 1 left end measuring head of measuring staff and kettle plug 3 be slidably matched between gap be 0.01~0.03mm.
1 left end of the extension measuring staff measurement cephalic par is designed to blade-like, guarantees measuring head cutting edge and sample in measurement process
18 bus of product is vertical, and measuring head cross section is square, and while being slidably matched with kettle plug 3, prevents measuring head from rotating, and guarantees to survey
Accuracy of measurement.
Apparatus of the present invention have measuring head latch functions, and before sample 18 is not loaded and is completely fixed, measuring head, which is in, to be retracted
State and by 7 locking of lock-nut, measuring head is not contacted with sample 18, and high temperature and pressure LVDT displacement sensor is effectively prevent to push
Sample 18 causes crooked dislocation, discharges measuring head by rotary locking nut 7 after the preloading of sample 18 is fixed, pass through spring
Thrust contact sample 18, LVDT displacement sensor are in measurement preparation state.
A kind of application method for the LVDT displacement sensor under high temperature and pressure, the method step are as follows:
One, the LVDT displacement sensor assembling under high temperature and pressure: assembling detection bar lockable mechanism first is to carry with pressure-bearing inner sleeve 6
Pin 8 is inserted into 6 radial equipartition hole of pressure-bearing inner sleeve by body, and sealing ring 2 15 is put into 7 inner hole groove of lock-nut, then will
Lock-nut 7 screws in pressure-bearing inner sleeve 6 from right end, and detection bar lockable mechanism is completed；Coil block is immediately assembled, by secondary wire
It encloses one 22, primary coil 23, secondary coil 2 24, pressure ring 14 to be successively inserted in from 6 right end smooth cylindrical of pressure-bearing inner sleeve, coil arrives
Position simultaneously connects loading housing 11 after lead, is finally fixed with locking nut 13, assembly is stand-by after the completion, next will
Induction magnetic core 12 screws in 9 right end of piston and fastens, and is then carrier with kettle plug 3, is horizontally arranged, and it is left from kettle plug 3 will to extend measuring staff 1
Right end is inserted into and is pierced by end, and piston 9 is screwed in induction 12 assembly of magnetic core to be extended 1 right end screw thread of measuring staff and fasten, then by spiral shell
Mother 4, cooling jacket 5 are successively inserted in from 3 right end of kettle plug, and sealing ring 1 is put into 6 inner hole groove of pressure-bearing inner sleeve, spring 10 is put
Enter 6 inner bore of step of pressure-bearing inner sleeve, 6 assembly of pressure-bearing inner sleeve is finally screwed in into the fastening of 3 right end of kettle plug, the position LVDT under high temperature and pressure
Displacement sensor is completed；
Two, the LVDT displacement sensor under high temperature and pressure is fitted into autoclave body 25: autoclave body 25 according to require complete except LVDT displacement pass
After components assembly outside sensor, high temperature and pressure LVDT displacement sensor is next filled, when for radial deformation measurement, for removal
Measurement error, high temperature and pressure LVDT displacement sensor need to usually be symmetrically installed two, need that the contracting of 1 measuring head of measuring staff will be extended before installation
It returns and locks, the specific practice is: 1 measuring head of measuring staff indentation kettle plug 3, rotary locking nut 7 counterclockwise, locking spiral shell will be extended manually
Female 7 nuts, which are moved to right to right end, locks measuring head, and after the assembly of LVDT displacement sensor has prepared, autoclave body 25 places positioning pin 2,
Metal O sealing ring 16 is placed in 27 end face of LVDT ring flange, and high temperature and pressure LVDT displacement sensor is inserted by 25 side opening of autoclave body, LVDT
After 27 end face of ring flange is adjacent to autoclave body 25, clamp nut 4 is screwed, experimental rig overall package is completed；
Three, experimental rig is integrally put into pressure testing machine: being closed up after experimental rig being integrally put into pressure testing machine in place
Heating furnace 26, connection confining pressure control system, LVDT sensor access data acquisition equipment, and the test preparation stage completes；
Four, experimental stage: undergauge is pushed to high temperature and pressure by confining pressure control system first and is injected to strain gauge means
0.5MPa argon gas protects sample, prevents from aoxidizing in heating process, then starts heating furnace 26 and heats to experimental rig, heating process
By process control；After heating temperature arrives, temperature is kept, and control pressurer system pushes undergauge to strain gauge means to high temperature and pressure
Injection testing medium carries out pressure testing machine initial pressure and resets work, resetting purpose is to deduct to setting value after injection
The influence of pressure medium and piston rod frictional force in cavity, obtains being pressurized to the true pressure on sample, and clearing starts, and controls manually
Pressing pressure testing machine pressurizing piston slowly declines, and contact high temperature and pressure pushes undergauge to after strain gauge means, pressure testing machine
Plus-pressure gradually increases, and there are the gap 2mm or so between 17 lower end surface of pressurizing piston bar and sample 18 when due to dress sample, pressurization is lived
Stopper rod 17 has one section of idle stroke when pushing, and since there are pressure in reaction kettle, just having started pressurizing piston bar 17 can't be moved,
When pressure testing machine plus-pressure reaches a certain level, pressurizing piston bar 17 is begun to decline, at this time press displacement sensor numerical value
Variation, but since idle stroke exists, less, power is the active force and piston rod friction that medium generates at this time for press pressure variation
The sum of power, when pressurizing piston bar 17 continues to push under pressure testing machine control, when press pressure continues growing 500 ~ 1000N,
Pressurizing piston bar 17 is completely attached to and is preloaded with sample 18, next rotates 25 two sides high temperature and pressure LVDT displacement sensing of autoclave body
Device lock-nut discharges measuring head, contacts it with sample 18, at this time it can be observed that high temperature and pressure LVDT displacement sensor number
Great changes have taken place for value, can reset to pressure testing machine, LVDT sensing data after numerical stability, can root after clearing
The control program being previously set according to test requirements document carries out applied voltage test by pressure testing machine, LVDT sensor data transmission in test
To pressure testing machine or collecting computer, sample radial-deformation is obtained by calculation relational expression, is obtaining sample forces and deformation
After relationship, so that it may calculate the mechanics parameters such as radial strain, Poisson's ratio, elasticity modulus.
The calculation relational expression are as follows:
ΔL=ΔL1+ΔL2
Wherein: Δ L- sample radial deformation, Δ L1- radial direction high temperature and pressure LVDT sensor one are displaced, and Δ L2- radial direction high temperature is high
LVDT sensor two is pressed to be displaced.
Using technical solution of the present invention, effect is as follows:
1, measuring head locking and release function that high temperature and pressure LVDT displacement sensor has general sensor no, it is ensured that sample
Before not starting compression test and fixing, sample does not push displacement or skew by sensor head, causes measurement error even
Test failure.
2, high temperature and pressure LVDT displacement sensor can be avoided effectively slight in sample pressure process when being symmetrically installed
Shake the influence to accuracy of measurement.
3, measuring head, which is designed as blade-like, can effectively avoid weak vibrations in sample pressure process, the variation pair of measurement contact point
The influence of accuracy of measurement.
4, high temperature and pressure LVDT sensor can cooperate as a whole parts with different pressures testing machine, knot
Structure extends to existing triaxial compression test machine, has bigger practical value.
5, this sensor can testing inspection sample it is more various, sample can be metal or nonmetallic.
6, compared with common triaxial compression test machine, the range for testing adaptation is wider, and be adapted to temperature: temperature is higher,
600 DEG C of highest, confining pressure medium is more various, and medium is adapted to the weak erosives liquid such as the indifferent gas such as argon gas and water, due to not
Dedicated deformeter or foil gauge need to be filled, use is easier to be reliable.
7, the device that compression test radial strain measures under high temperature and pressure is used through actual test, and measurement accuracy error reaches
Test requirements document, resolution ratio reach 0.5 μm, and 2 μm of accuracy, easy to use, reliable performance provides one kind for high temperature and pressure test
New means of testing.
Place is not described in detail by the present invention, is the well-known technique of those skilled in the art of the present technique.Finally, it is stated that the above reality
It applies example to be only used to illustrate the technical scheme of the present invention and not to limit it, although having carried out specifically the present invention referring to preferred embodiment
It is bright, those skilled in the art should understand that, can with modification or equivalent replacement of the technical solution of the present invention are made, and
The objective and range for not departing from technical solution of the present invention, are intended to be within the scope of the claims of the invention.
Claims (7)
1. a kind of LVDT displacement sensor under high temperature and pressure, it is characterised in that: it include high temperature and pressure connecting component and
Displacement detection part, the high temperature and pressure connecting component and displacement detection part it is axially distributed and pass through cylindrical surface positioning threads
Connection is equipped with high-temperature and high-presure resistent sealing ring one (21) between high temperature and pressure connecting component and displacement detection part, is being close to
Movable sleeve is connected to cooling jacket (5) in high temperature and pressure connecting component at displacement detection part.
2. the LVDT displacement sensor according to claim 1 under high temperature and pressure, it is characterised in that: the high temperature is high
Pressure connecting component includes positioning pin (2), kettle plug (3), nut (4) and metallic O ring (16), and the kettle plug (3) is that centre has company
The round tube shape structure of logical cavity body, kettle plug (3) left end outer circle are smooth, cylindrical peripheral surface and autoclave body (25) peace for being inserted into high temperature and pressure
It fills in hole, is pressed abd fixed on autoclave body (25) by covering in the nut (4) on kettle plug (3), is equipped in kettle plug (3) close left part convex
It rises flange (27), flange (27) left side is bonded with autoclave body (25) wall surface, and flange (27) right side is contacted with nut (4), in method
Blue (27) left side is equipped with annular groove, and annular groove is provided with metallic O ring (16), and flange (27) top sets dowel hole, pin hole
Inside there is the positioning pin (2) being fixed on autoclave body (25), kettle plug (3) right end outer circle is equipped with the cylinder matched with displacement detection part
Face connects external screw thread, and cooling jacket (5) is socketed in kettle plug (3) right end outer circle.
3. the LVDT displacement sensor according to claim 1 under high temperature and pressure, it is characterised in that: the displacement inspection
Surveying component includes coil block, displacement detecting bar assembly, detection bar lockable mechanism；
The coil block includes pressure-bearing inner sleeve (6), secondary coil one (22), primary coil (23), secondary coil two (24)
, pressure ring (14), housing (11) and locking nut (13), the pressure-bearing inner sleeve (6) is cylinder-like structure, pressure-bearing inner sleeve (6) it is interior
Portion is equipped with the blind hole that left end opening right part is multi-stage stairs, from left to right matches respectively with kettle plug (3) and displacement detecting bar assembly
Connection is closed, left end inner hole and kettle plug (3) right end outer circle are slidably matched and pass through viton seal ring one (21) sealing, sealing ring one
(21) left side is equipped with and screw thread and is threadedly coupled with kettle plug (3) right end, the secondary coil one (22), primary coil (23),
Secondary coil two (24) is circular and is from left to right successively sleeved on right section of lateral wall of pressure-bearing inner sleeve (6), wherein secondary
Coil one (22) and secondary coil two (24) are symmetrically mounted on primary coil (23) two sides, and lead is at differential connection, coil windings
Outside is socketed with housing (11), and pressure ring (14) loop is in pressure-bearing inner sleeve (6) right end outer circle and is close to secondary coil two (24) right side
End, by locking nut (13) by secondary coil one (22), primary coil (23), secondary coil two (24), pressure ring (14) and
Housing (11) axial compression is fixed, and locking nut (13) is threaded in the right part of pressure-bearing inner sleeve (6)；
The displacement detecting bar assembly includes extending measuring staff (1), piston (9) and induction magnetic core (12) and difference from left to right along axis
To threaded connection, extending measuring staff (1) is the elongate rod for being inserted into kettle plug (3) inner cavity, and extension measuring staff (1) left end gauge head is blade
Shape, cutting edge are contacted with sample (18) bus, and section is square, and are slidably matched with kettle plug (3) inner hole, and measuring staff (1) is extended
Right end is threadedly coupled with piston (9), and piston (9) is multi-stage stairs shape cylindrical body, is from left to right become smaller step by step, left end major part cylinder
Both ends are equipped with 30 ° of chamferings, are to be slidably matched with pressure-bearing inner sleeve (6) inner hole, piston (9) right end microcephaly and induction magnetic core (12) screw thread
Connection, induction magnetic core (12) and pressure-bearing inner sleeve (6) inner hole are clearance fit, are set between piston (9) middle section and pressure-bearing inner sleeve (6)
There are compressed spring (10)；
The detection bar lockable mechanism is located in the outer circle of pressure-bearing inner sleeve (6) middle section, including pin (8) and lock-nut (7), described
Pin (8) be both ends be hemispherical cylinder it is rod-shaped and be located at pressure-bearing inner sleeve (6) radial equipartition 4 through-holes in, can be in hole
Middle sliding, lock-nut (7) are annular shape, and right end is internal screw thread, and left end is cylindrical hole, are matched with the sliding of pressure-bearing inner sleeve (6) outer circle
It closes, position is equipped with arc groove, the symmetrical ring-shaped groove in slot both sides, the built-in high temperature high voltage resistant sealing ring two of groove among hole
(15), when lock-nut (7), which rotates clockwise, is moved to left end, pin (8) is located at lock-nut (7) arc groove, pin
Nail (8) can be displaced outwardly space maximum.
4. the LVDT displacement sensor according to claim 2 under high temperature and pressure, it is characterised in that: the kettle plug
(3) material is nickel base superalloy GH4698, and the material of nut (4) is nickel base superalloy GH4169.
5. the LVDT displacement sensor according to claim 3 under high temperature and pressure, it is characterised in that: in the pressure-bearing
Covering (6) is no magnetic TC4 titanium alloy, and pressure ring (14), housing (11) and locking nut (13) Zhuo are no stainless steel of magnetic SUS316
At the extension measuring staff (1) and piston (9) are no magnetic TC4 titanium alloy, and induction magnetic core (12) is high-permeability material IJ50, bullet
Spring (10) is nickel-bass alloy material.
6. a kind of LVDT displacement sensor under high temperature and pressure according to claim 3, it is characterised in that: the work
Filling in the gap between (9) and pressure-bearing inner sleeve (6) inner hole is 0.01~0.03mm, incudes the outer circle and pressure-bearing inner sleeve of magnetic core (12)
(6) gap between inner hole is 0.1~0.3mm.
7. a kind of LVDT displacement sensor under high temperature and pressure according to claim 3, it is characterised in that: described to prolong
Long measuring staff (1) left end measuring head and kettle plug (3) be slidably matched between gap be 0.01~0.03mm.
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