CN207907996U - A kind of float-type high temperature Na-K alloy liquid level gauge - Google Patents
A kind of float-type high temperature Na-K alloy liquid level gauge Download PDFInfo
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- CN207907996U CN207907996U CN201820212978.8U CN201820212978U CN207907996U CN 207907996 U CN207907996 U CN 207907996U CN 201820212978 U CN201820212978 U CN 201820212978U CN 207907996 U CN207907996 U CN 207907996U
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- liquid level
- floating drum
- outer barrel
- float
- high temperature
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Abstract
The utility model is related to a kind of float-type high temperature Na-K alloy liquid level gauges, including liquid level sensor, programmable logic controller (PLC) and temperature control unit；Programmable logic controller (PLC) is for exporting correction-compensation data；Temperature control unit is for compensating the environmental data of liquid level sensor；Liquid level sensor includes outer barrel, interior floating drum and gas isolated form differential transformer；Interior floating drum is hung on by spring inside outer barrel；Outer barrel forms linker structure with tested container；Interior floating drum can change with working medium liquid level and generate relative position variation with outer barrel；The iron core and interior floating drum for being pneumatically isolated type differential transformer are relatively fixed；Outer barrel is relatively fixed with the coil for being pneumatically isolated type differential transformer.The beneficial effects of the utility model are：Simple in structure, cost is relatively low, and accuracy is higher, and reliability is preferable, easy to implement in laboratory conditions.
Description
Technical field
The utility model belongs to material analysis field, and in particular to a kind of float-type high temperature Na-K alloy liquid level gauge.
Background technology
The continuous accurate measurement of liquid metal Na-K alloy liquid level is always to perplex the difficulty of researcher under hot conditions
Topic, this mainly due to Na-K alloy physical property and its operating condition it is common caused by.Na-K alloy chemical characteristic is active, inflammable easy
Quick-fried, room temperature is liquid, and saturated vapour pressure is relatively low, and more other liquid metals (such as potassium, sodium) are more likely formed steaming under the high temperature conditions
Gas, Na-K alloy vapor-dispersing are condensed in ullage, and in temperature lower.Under usual operating mode, on Na-K alloy liquid level
The blanketing gas of Fang Huiyou certain pressures, the vacuum pumping that equipment carries out can be further exacerbated by Na-K alloy from liquid to steam
The transformation of state.In conclusion since working medium high temperature, metal vapor condensation and the factors such as blanketing gas pressure is changeable make most liquid
Position meter all can not long-term work.In reality, since probe or waveguide rod (beam) are adhered to after metal vapor condensation, ultrasonic wave, thunder
It can fail up to infrared reflection liquid level gauge.Though can be worked normally by the liquid level gauge that radioactive source works, the radiation caused
Safety problem protrudes.In this case, it is usually worked more for the liquid level gauge of operation principle with inductance, differential pressure, buoyancy variation
Reliably.
For Na-K alloy liquid level gauge usually in 0 DEG C~600 DEG C of Temperature of Working, power pressure is 0~0.3MPa (absolute pressure)
Under the conditions of, liquid level gauging liquid level resolution ratio is 1mm, measuring accuracy≤± 5.0mm, response time≤0.5s, stability requirement
Better than 12 months.
Liquid metal Na-K alloy level gauging demand under the conditions of high temperature complex pressure generally only exists in scientific research field,
Market can not provide that ripe goods shelf products are alternative, and user generally understands the corresponding measurement means of specific aim organization development.
The calibration process and differential pressure type level gauge of high cost and complexity for inductance-type liquidometer are under complex environment
Low unfailing performance, the utility model provide a kind of change buoyancy float level meter based on differential transformer.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to provide a kind of float-type high temperature Na-K alloy
Liquid level gauge is at least capable of providing the liquid metal Na-K alloy level gauging under the conditions of a kind of new solution high temperature complex pressure and asks
The alternative of topic.
The technical solution of the utility model is as follows：
A kind of float-type high temperature Na-K alloy liquid level gauge, including liquid level sensor, programmable logic controller (PLC) and temperature control
Unit processed；
The programmable logic controller (PLC) is used for according to the environmental data of the tested container and the liquid level sensor
Environmental data exports correction-compensation data；
The temperature control unit be used for according to the correction-compensation data to the environmental data of the liquid level sensor into
Row compensation；
The liquid level sensor includes outer barrel, interior floating drum and gas isolated form differential transformer；The interior floating drum passes through
Spring is hung on inside the outer barrel；The outer barrel forms linker structure with tested container；The interior floating drum can be with
Working medium liquid level changes and generates relative position variation with the outer barrel；The iron core for being pneumatically isolated type differential transformer and institute
Interior floating drum is stated to be relatively fixed；Outer barrel is relatively fixed with the coil for being pneumatically isolated type differential transformer.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge, the upper and lower part of the outer barrel is set respectively
There is on interior floating drum guide pipe under guide pipe and interior floating drum；The upper and lower part of the interior floating drum be respectively equipped with on the interior floating drum
The upper guide rod and coordinate lower guide rod with guide pipe under the interior floating drum that guide pipe coordinates.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge is provided with longitudinal ditch on the lower guide rod
Slot.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge is additionally provided with special-shaped friendship on the upper guide rod
Wrong groove.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge, on the interior floating drum under guide pipe and interior floating drum
Guide pipe is tubulose, and wall surface is provided with relief hole.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge, the outer barrel are internally provided with metal vapors
Condensing reflux structure, the metal vapors condensing reflux structure include the cooling fin through outer barrel barrel.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge, the lower mouth of the lower guide pipe are provided with drain
Mouthful, it is provided with VCR blind pluggings at the leakage fluid dram.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge further includes be set to the upper guide pipe upper
The spring housing of side, the spring are mounted in the sealed chamber of the spring housing, and for lower support on spring housing's pedestal, top is outstanding
Floating drum in hanging.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge is provided with obstruction metal on the upper guide pipe
Steam is attached to the cooling fin of spring housing.
Further, above-mentioned float-type high temperature Na-K alloy liquid level gauge, the outer barrel top are provided with floating drum maintenance
Flange.
The beneficial effects of the utility model are as follows：
1, liquid level gauge provided by the utility model is simple in structure, is based on mechanical balance principle, and principle is simple, and fluid change is high
Degree it is related with working medium density and the elastic coefficient k, in the case where temperature is stablized, fluid change height only with spring system
Number k is related, and cost is relatively low, and accuracy is higher, and reliability is preferable, easy to implement in laboratory conditions.
2, liquid level gauge adaptation Na-K alloy working medium operating temperature range provided by the utility model is wider, can be by 0 DEG C to 600
DEG C, adaptation Na-K alloy pressure limit is wider, by absolute pressure 0Pa to 0.3MPa or higher.
3, liquid level gauge provided by the utility model devises metal vapors condensing reflux structure, and Na-K alloy can be effectively relieved
The influence that steam measures liquid level gauge can work under high temperature refrigerant and lower pressure.
4, liquid level gauge provided by the utility model is due to carrying out active temperature control, while having Na-K alloy working medium density
Compensation function, therefore higher measurement accuracy can be obtained.
5, liquid level gauge provided by the utility model has the structure of devaporation detection device and disassembling cleaning, works as steam
Condensation can carry out washing and cleaning operation when seriously affecting accuracy of measurement.
Description of the drawings
Fig. 1 is the structural schematic diagram of the float-type high temperature Na-K alloy liquid level gauge of the utility model.
Fig. 2 is the principle schematic of the liquid level sensor of the utility model.
Fig. 3 is the structural schematic diagram of the liquid level sensor of the utility model.
In above-mentioned attached drawing, 1, outer barrel；2, upper guide pipe；3, lower guide pipe；4, condensing reflux structure；5, interior floating drum；6、
Leakage fluid dram；7, working medium connecting cylinder；8, floating drum overhauls flange；9, spring housing；10, spring；11, flange overhauls in spring housing.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the utility model provides a kind of float-type high temperature Na-K alloy liquid level gauge, including level sensing
Device, programmable logic controller (PLC) and temperature control unit；The programmable logic controller (PLC) is used for according to the tested container
The environmental data of environmental data and the liquid level sensor exports correction-compensation data；The temperature control unit is used for according to institute
Correction-compensation data are stated to compensate the environmental data of the liquid level sensor；The liquid level sensor includes outer barrel 1, interior
Floating drum 5 and gas isolated form differential transformer；The interior floating drum 5 is hung on by spring 10 inside the outer barrel 1；It is described outer
Cylinder 1 forms linker structure with tested container；The interior floating drum 5 can change with working medium liquid level and be produced in the outer barrel 1
Raw relative position variation；The iron core for being pneumatically isolated type differential transformer is relatively fixed with the interior floating drum 5；Outer barrel 1 with
The coil for being pneumatically isolated type differential transformer is relatively fixed.According to the coil and iron for being pneumatically isolated type differential transformer
The relative position variation of core can confirm that liquid level changes.
Type differential transformer is pneumatically isolated for measuring the caused buoy displacement of liquid level variation, output in the present embodiment
Signal amplitude is directly proportional to buoy displacement variable quantity.It is different from conventional differential transformer, is internally provided with gas barrier blind pipe.Difference
The iron core of dynamic transformer is arranged in blind pipe, and the coil of differential transformer is arranged outside blind pipe, while realizing measurement function
It realizes gas barrier, liquid level sensor floating drum is made to work under enclosed environment.Logic programmable controller (control and the compensation
Unit) it is mainly responsible for temperature measurement and the temperature control of liquid level sensor outer barrel 1, according to tested liquid level container and level sensing
Temperature of Working carries out density compensation calculating in device, corrects and measures liquid level numerical value.Float level sensor, tested liquid level vessel temp
Measurement use thermocouple, be tested liquid level container Temperature of Working for accurate measure, the installation of TC is in container thermocouple trap.Temperature
Control unit, the temperature control signals sent out for receiving logic programmable controller control heater power, make measurement floating drum
Liquid level sensor temperature includes mainly power circuit and heater in specified range value.Heater is installed in float level
1 outside wall surface of sensor outer barrel.When specific installation, outer barrel 1 is taken to measure the appropriate location of workspace center outer surface, spot welding peace
Isolated junction type sheathed thermocouple is filled, and heater is installed in outer wall, closed loop thermal control, work are implemented by logic programmable controller
In specific temperature.
When liquid level sensor works, when the working medium liquid level of workspace changes in outer barrel 1, interior floating drum 5 drives differential
Transformer core position changes, and differential transformer is by detecting plunger position, so that it may the position data of liquid level is obtained, not
In the case of considering temperature effect, position and the differential transformer output signal of liquid level have linear monotonic correspondence.Due to
The temperature of working medium is usually higher in tested container, and has certain variation range.If liquid level sensor is controlled without temperature, liquid level
Working medium liquid level is usually lower than the liquid level in tested container in sensor, this is because the Na-K alloy temperature in liquid level sensor
Relatively low, density is larger.If temperature-compensating is only carried out and the unreal alms giver's dynamic temperature control of liquid level sensor, due to the heat of Na-K alloy
Layering effect (while thermally stratified layer may also occur in Na-K alloy in tested container, but it is layered situation and liquid level gauge inner case simultaneously
Differ), compensation error is larger, so, active temperature control is carried out to liquid level sensor, its internal working medium is made to be in same temperature
Under degree, thermomixture effect is reduced, and then improve measurement accuracy.Due to introducing active temperature control, liquid level gauge can also simulate
The thermomixture effect of Na-K alloy in tested container, to further increase measurement accuracy.Measurement, control and the temperature of above-mentioned temperature
Effect amendment and compensation, are completed jointly by logic programmable controller and temperature control unit.The temperature of liquid level sensor controls
It can be arranged and follow Temperature of Working in tested container, also may be set to fixed value, but be generally set to follow working medium temperature in tested container
Degree.Specially：Power pressure be 0-0.3MPa (absolute pressure), when in tested container Temperature of Working be 500 DEG C, liquid level sensor
1 temperature of outer barrel is 500 DEG C, in 0%-100% level gaugings area, measurement exactness≤± 4.0mm, and the response time≤0.1s,
Liquid level resolution ratio 1mm.
As shown in Fig. 2, the technical solution of the utility model is to be based on mechanical balance basic principle, specially：
k·δL=δF (1)
In formula：K-the elastic coefficient；
δL- spring deformation amount；
δFFloat buoyancy variation in caused by the variation of-liquid level.
δF=ρ δV·g (2)
In formula：ρ-working medium density；
δVFloating drum discharging liquid product variation in caused by the variation of-liquid level；
G-acceleration of gravity.
δV=S δh (3)
In formula：The interior floating drum sectional areas of S-；
δh- liquid level change in elevation.
δL=ρ S δh·g/k (4)
Therefore fluid change height Δ H is：
Δ H=δh+δL=δh·(1+ρ·S·g/k) (5)
As shown from the above formula, spring deformation amount δLIt is proportional to liquid level change in elevation Δ H.Spring deformation amount δLIt is differential
The iron core displacement of transformer.At work, the buoyancy suffered by floating drum is variation to float-type Na-K alloy liquid level gauge, but always
In mechanical balance state, i.e. the gravity of spar structures is equal to spring force and the sum of buoyancy suffered by floating drum.
It is illustrated in figure 3 the specific knot of the liquid level sensor of the float-type high temperature Na-K alloy liquid level gauge of the utility model
Structure, the upper and lower part of the outer barrel 1 are respectively equipped on interior floating drum guide pipe 3 under guide pipe 2 and interior floating drum, with floating in ensureing
Cylinder 5 is only capable of moving along outer barrel 1 and 5 axial direction of interior floating drum when working.The big L/D ratio that the interior floating drum 5 generally seals is thin
Wall cylinder, upper and lower part be respectively equipped with on the interior floating drum guide pipe 2 coordinate upper guide rod and under the interior floating drum
The lower guide rod of the cooperation of guide pipe 3.Guide rod is inserted into corresponding guide pipe.Appropriate location outside outer barrel 1, which is provided with, to be belonged to
Thermocouple, heater and the insulation construction of the temperature control unit.It is provided with longitudinal groove on the lower guide rod, is prevented
Since guide pipe external and internal pressure imbalance causes floating drum stuck.It is additionally provided with abnormity staggeredly groove on the upper guide rod, is used for
Strengthen the condensation of residual metal steam and reflowing result.Guide pipe 3 is tubulose under guide pipe 2 and interior floating drum on the interior floating drum,
And wall surface is provided with relief hole, it prevents from causing floating drum stuck due to guide pipe external and internal pressure imbalance.Guide pipe internal face
Machining accuracy is higher, and purpose is to reduce its frictional force between lower guide rod.
The outer barrel 1 is internally provided with metal vapors condensing reflux structure 4, the metal vapors condensing reflux structure 4
It include the cooling fin through 1 barrel of outer barrel；For the metal vapors diffused in floating drum ullage space to be condensed into liquid
Body simultaneously flows back, and return flow line is constituted by 1 inner tube wall of outer barrel and cooling fin.Since cooling fin directly extends through inside air cavity, gold
Belong to steam to be more easy to that molten drop is condensed and formed on its surface, when drop reaches certain size, be back to by gravity
Liquid level.
Further, the lower mouth of the lower guide pipe is provided with leakage fluid dram 6, and VCR blind pluggings are provided at the leakage fluid dram 6,
To adapt to high temperature fluent metal working medium.In maintenance, silk plug is opened, working medium discharge can will be remained in liquid level sensor.
Working medium communicating pipe 7 is arranged on 1 side wall of outer barrel, totally 2, respectively upper protective gas communicating pipe and lower working medium connection
Siphunculus.The effect of communicating pipe is that liquid level sensor and tested container D are constituted linker structure, and working medium generates in liquid level sensor
Pressure be equal to tested container in working medium generate pressure.VCR connectors are arranged in communicating pipe, to adapt to high temperature fluent metal working medium.
It is provided with insulation construction outside lower working medium cross over pipe.Working medium communicating pipe 7 is connected to by welded seal on outer barrel 1, communicating pipe
Side sealing welding be connected to VCR connectors, be connected on the pairing VCR connectors of tested container.
Further include the spring housing 9 for the top for being set to the upper guide pipe in the present embodiment, the spring 10 is installed on
In the sealed chamber of the spring housing 9, lower support is on 9 pedestal of spring housing, floating drum 5 in upper suspension.In spring housing 9
Flange 11 overhauls in setting spring housing of side, and form of flanges is high vacuum seal flange, and seal washer material can be nickel, soft iron, maintenance
When flange is opened, interior floating drum 5 and spring 10 can be extracted out.
The cooling fin for hindering metal vapors to be attached to spring housing 9 is provided on the interior floating drum on guide pipe 2；Its effect makes
Kish steam condenses, and prevents metal vapors condensation in spring housing 9, while spring 10 can also be kept to be in environment temperature.
Specifically, 2 upper exposed of guide pipe is in air on interior floating drum, outside wall surface is equipped with cyclic annular cooling fin, for preventing liquid level gauge
The heat of workspace conducts upward, while providing time condensation, to prevent the condensation in spring housing 9 of residual metal steam,
Spring 10 can be kept to be within the scope of normal working temperature.9 lower base of spring housing is welded with 2 top seal of guide pipe on interior floating drum
It connects in succession, 9 top of spring housing is overhauled 11 lower flange sealing welding of flange with spring housing and connect.Form of flanges seals for high-temperature vacuum
Flange, seal washer are nickel washer, soft iron washer or copper washer.The internal gas of sealing flange upper flange and differential transformer 12
Isolation blind pipe, which is sealed, to be welded to connect.
1 top of the outer barrel is provided with floating drum maintenance flange；Lower flange is connect with 1 sealing welding of outer barrel, floating drum inspection
Blue 8 upper flanges that amend the law are connect with 2 sealing welding of guide pipe on interior floating drum.Form of flanges is high vacuum seal flange, seal washer
Material, which can be nickel, soft iron, can extract interior floating drum 5 out when maintenance flange 8 is opened.
It when mounting flange, must ensure installation accuracy, prevent Shaft misalignment and cause the action of interior floating drum 5 to have some setbacks even and block
Extremely.1 inside certain depth of outer barrel is inserted into 2 lower part of guide pipe on interior floating drum, plays floating drum 5 in positioning and guiding.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, belonging to the utility model claims to these modifications and variations of the present invention
And its within the scope of equivalent technology, then the utility model is also intended to include these modifications and variations.
Claims (10)
1. a kind of float-type high temperature Na-K alloy liquid level gauge, it is characterised in that：Including liquid level sensor, programmable logic controller (PLC)
And temperature control unit；
The programmable logic controller (PLC) is used for the environmental data of the environmental data and the liquid level sensor according to tested container
Export correction-compensation data；
The temperature control unit is for mending the environmental data of the liquid level sensor according to the correction-compensation data
It repays；
The liquid level sensor includes outer barrel, interior floating drum and gas isolated form differential transformer；The interior floating drum passes through spring
It hangs on inside the outer barrel；The outer barrel forms linker structure with tested container；The interior floating drum can be with working medium
Liquid level changes and generates relative position variation with the outer barrel；It is pneumatically isolated the iron core of type differential transformer and the interior floating drum
It is relatively fixed；Outer barrel is relatively fixed with the coil for being pneumatically isolated type differential transformer.
2. float-type high temperature Na-K alloy liquid level gauge as described in claim 1, it is characterised in that：The top of the outer barrel and
Lower part is respectively equipped on interior floating drum guide pipe under guide pipe and interior floating drum；The upper and lower part of the interior floating drum is respectively equipped with and institute
State the upper guide rod and coordinate lower guide rod with guide pipe under the interior floating drum that guide pipe coordinates on interior floating drum.
3. float-type high temperature Na-K alloy liquid level gauge as claimed in claim 2, it is characterised in that：It is arranged on the lower guide rod
With longitudinal groove.
4. float-type high temperature Na-K alloy liquid level gauge as claimed in claim 3, it is characterised in that：It is also set on the upper guide rod
It is equipped with abnormity staggeredly groove.
5. float-type high temperature Na-K alloy liquid level gauge as claimed in claim 2, it is characterised in that：Guide pipe on the interior floating drum
It is tubulose with guide pipe under interior floating drum, and wall surface is provided with relief hole.
6. float-type high temperature Na-K alloy liquid level gauge as described in claim 1, it is characterised in that：Setting inside the outer barrel
It includes the cooling fin through outer barrel barrel to have metal vapors condensing reflux structure, the metal vapors condensing reflux structure.
7. float-type high temperature Na-K alloy liquid level gauge as described in claim 1, it is characterised in that：The lower mouth of lower guide pipe is arranged
There is leakage fluid dram, VCR blind pluggings are provided at the leakage fluid dram.
8. float-type high temperature Na-K alloy liquid level gauge as claimed in claim 2, it is characterised in that：Further include being set on described
The spring housing of the top of guide pipe, the spring are mounted in the sealed chamber of the spring housing, and lower support is at spring housing bottom
On seat, floating drum in upper suspension.
9. float-type high temperature Na-K alloy liquid level gauge as claimed in claim 8, it is characterised in that：It is arranged on the upper guide pipe
There is the cooling fin for hindering metal vapors to be attached to spring housing.
10. the float-type high temperature Na-K alloy liquid level gauge as described in claim 1-9 is any, it is characterised in that：The outer barrel
Top is provided with floating drum maintenance flange.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820212978.8U CN207907996U (en) | 2018-02-07 | 2018-02-07 | A kind of float-type high temperature Na-K alloy liquid level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820212978.8U CN207907996U (en) | 2018-02-07 | 2018-02-07 | A kind of float-type high temperature Na-K alloy liquid level gauge |
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| CN207907996U true CN207907996U (en) | 2018-09-25 |
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ID=63563444
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387287A (en) * | 2018-02-07 | 2018-08-10 | 中国原子能科学研究院 | A kind of float-type high temperature Na-K alloy liquid level gauge |
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2018
- 2018-02-07 CN CN201820212978.8U patent/CN207907996U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387287A (en) * | 2018-02-07 | 2018-08-10 | 中国原子能科学研究院 | A kind of float-type high temperature Na-K alloy liquid level gauge |
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