CN106969869A - Environment-friendly high-temperature melt force sensor - Google Patents
Environment-friendly high-temperature melt force sensor Download PDFInfo
- Publication number
- CN106969869A CN106969869A CN201710184224.6A CN201710184224A CN106969869A CN 106969869 A CN106969869 A CN 106969869A CN 201710184224 A CN201710184224 A CN 201710184224A CN 106969869 A CN106969869 A CN 106969869A
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- CN
- China
- Prior art keywords
- pedestal
- detecting element
- pressure detecting
- environment
- force sensor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/18—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/022—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges constructional details, e.g. mounting of elastically-deformable gauges
Abstract
The invention discloses a kind of environment-friendly high-temperature melt force sensor, it includes diaphragm, capillary and pressure detecting element, screw rod, pedestal, shell and aerial plug-in unit；The diaphragm is connected to the front end of the screw rod and closes the screw front end, the rear end of the screw rod is connected with the front end of the pedestal, the pedestal is installed on the front end of the shell, the pressure detecting element is connected to the pedestal rear end, the capillary connects through the screw rod and the pedestal and with the pressure detecting element diaphragm, and the aerial plug-in unit is installed on the housing and electrically connected with the pressure detecting element；Low-melting alloy is filled with the capillary, by weight percentage, described low-melting alloy composition is：Gallium 55~65%, indium 16~22%, tin 10~15%, lead 2~5% and thallium 1~3%.The high-temperature fusant pressure sensor is using green non-poisonous low-melting alloy as transmission medium, and safety and environmental protection does not result in heavy metal pollution.
Description
Technical field
A kind of pressure sensor technique field of the present invention, and in particular to environment-friendly high-temperature melt force sensor.
Background technology
High-temperature fusant pressure sensor is mainly used in the pressure measxurement and control of melt substance under hot conditions.High-temperature fusant
Pressure sensor is widely used in the pressure measxurement of the high temperature fluid medium of the equipment such as chemical fibre plastics, spinning, polyester, rubber and plastics machine
With control.The operation principle of high-temperature fusant pressure sensor is that the pressure of medium is acted directly on the diaphragm of sensor, makes film
Piece produces the micro-displacement that is directly proportional to pressure medium, the resistance of sensor is changed and be detected with electronic circuit this change
Change, and change the standard signal that output one corresponds to this pressure.
High-temperature fusant pressure sensor (transmitter) of the prior art is all to use isolation diaphragm and pressure detecting element
Between connected with capillary, and vacuumized in capillary and fill this extremely toxic substance of mercury, because to ensure measuring pressure
Accuracy, the thickness of isolation diaphragm only has 0.12 mm of thickness, and isolation diaphragm is extremely easily broken, so that cause mercury to leak,
Cause heavy metal pollution.
To avoid the generation of heavy metal pollution and security incident, those skilled in the art are directed to developing safety and environmental protection always
High-temperature fusant pressure sensor.Mercury is replaced using the mercury substitute of safety and environmental protection as filled media, is to solve dirt
The most directly effective method of dye problem.But use mercury as the operating temperature range of transmission medium extensively and low at some
In the instrument and meter and sensor of warm environment measurement, mercury substitute must strictly meet following condition：
You Heshui can not be dissolved in；
Itself is nontoxic, to stainless steel non-corrosiveness, nonflammable, non-explosive；
Proportion is as big as possible；
(subzero -22.4 DEG C) are also liquid condition under normal temperature even low temperature, and with flowable, viscosity can not be excessive,
Boiling point is as high as possible；
Saturated vapor pressure is small, and gas solubility is the smaller the better；
Between -25 DEG C~500 DEG C, temperature coefficient is the smaller the better in technical indicator, and proportion variation with temperature does not change；
Wetability is small to the adhesion on stainless steel wall.
More it is difficult except meeting above-mentioned technical requirements, mercury substitute tends to be oxidized, will when filling with encapsulation
Ask also higher.
Mercury substitute on the market is generally gallium-base alloy at present, mercury can be substituted in many instruments, but consider
Northern cold snap, temperature even can reach -18 DEG C or so.Gallium-base alloy fusing point on the market is at maximum up to 0 DEG C.And items
Energy index changes with the change of temperature, and the accuracy of measurement medium is such as unable to reach with ready-made gallium-base alloy.
The content of the invention
Therefore, the technology that the present invention mercury leakage pollution easily occurs for high-temperature fusant pressure sensor in the prior art is asked
Topic, it is therefore intended that a kind of environment-friendly high-temperature melt force sensor is provided.
The environment-friendly high-temperature melt force sensor of the present invention includes diaphragm, capillary and pressure detecting element, in addition to
Screw rod, pedestal, shell and aerial plug-in unit；The diaphragm is connected to the front end of the screw rod and closed the screw front end, institute
The rear end for stating screw rod is connected with the front end of the pedestal, and the pedestal is installed on the front end of the shell, the pressure detecting member
Part is connected to the pedestal rear end, and the capillary through the screw rod and the pedestal and is examined the diaphragm and the pressure
Element connection is surveyed, the aerial plug-in unit is installed on the housing and electrically connected with the pressure detecting element；
Low-melting alloy is filled with the capillary, by weight percentage, described low-melting alloy includes：Gallium 55
~65%, indium 16~22%, tin 10~15%, lead 2~5% and thallium 1~3%.
Described low-melting alloy includes：Gallium 58~65%, indium 16~22%, tin 10~15%, lead 3~5% and thallium 2~
3%.
Described low-melting alloy is overcoating to be stamped coverture fluorine carbon, and the amount of coverture fluorine carbon is that gallium, indium, tin, lead and thallium are total
The 1~5% of quality, preferably 2~3%.
Preferably, the capillary is stainless steel and inwall is coated with one layer of TiAlN overlay film, TiAlN overlay films chemistry is steady
It is qualitative good, the features such as with high thermohardening, excellent oxidation resistance, abrasion performance, it can further avoid described low-melting alloy pair
The wetting of the capillary.
Preferably, the pressure detecting element is the integrated formed structure sintered by strain gauge and elastomer.
Preferably, the pressure detecting element is welded with the pedestal by argon arc welding machine.
Preferably, leaving chamber between the pressure detecting element and the pedestal, the chamber is used to expand capillary
Interior liquid and the contact area of pressure detecting element.
Preferably, a circle groove is respectively equipped with around the pedestal and the aerial plug-in unit and sealing ring is equipped, institute
Pedestal and the aerial plug-in unit is stated respectively to encapsulate the pressure detecting element with body seal cooperation.
The positive effect of the present invention is：On the one hand the high-temperature fusant pressure sensor of the present invention employs green
The nontoxic low-melting alloy of color has advantages below as transmission medium, described low-melting alloy：1st, fusing point can as little as -20
DEG C, preferably can as little as -22.4 DEG C；2nd, surface tension is big, poor to stainless steel capillary wetability, can also protect at a lower temperature
Hold preferably mobility；3rd, operating temperature range is wide, in the range of -20 DEG C~500 DEG C, with the change of temperature, density, viscous
The technical indicators such as degree, thermal conductivity and surface tension do not change；4th, the high not volatile, safety non-toxic of boiling point, it is nonflammable, be difficult
It is quick-fried, even if leakage does not result in heavy metal pollution；Transmission medium is used as using the low-melting alloy, it is ensured that high-temperature fusant pressure
Security, stability and the accuracy of sensor.
On the other hand, the high-temperature fusant pressure sensor structure is compact, good airproof performance, and the encapsulating structure of the shell can
Ensure the pressure detecting element and low-melting alloy and air insulated, be prevented effectively from oxidation, increase the service life.
Brief description of the drawings
Fig. 1 is the sectional view of the environment-friendly high-temperature melt force sensor of the present invention；
Fig. 2 is pedestal and the sectional view of pressure detecting element junction.
Embodiment
And with specific embodiments and the drawings is made further to the environment-friendly high-temperature melt force sensor of the present invention
Explanation.
The high-temperature fusant pressure sensor of embodiment 1~4
Fig. 1 show the high-temperature fusant pressure sensor of some of the invention preferred embodiments, it include diaphragm 1, screw rod 2,
Pedestal 3, capillary 4, shell 5, pressure detecting element 6 and aerial plug-in unit 7.Wherein,
Diaphragm 1 in the front end of screw rod 2 and is closed the front end of screw rod 2 by laser welding.The rear end of screw rod 2 and pedestal 3
Front end is connected.Pedestal 3 is installed on the front end of shell 5.Pressure detecting element 6 is the one sintered by strain gauge and elastomer
Molding structure, and the rear end of pedestal 3 is welded on by argon arc welding machine.Capillary 4 is welded between screw rod 2 and pedestal 3 and through spiral shell
Bar 2 and pedestal 3 connect diaphragm 1 with pressure detecting element 6, and aerial plug-in unit 7 is arranged on the rear end of shell 5 and and pressure detecting element
6 connections.As shown in Fig. 2 leaving chamber 8 between pressure detecting element 6 and pedestal 3, chamber 8 is used to expand the liquid in capillary
With the contact area of pressure detecting element.
Preferably, a circle groove is respectively equipped with around pedestal 3 and aerial plug-in unit 7 and sealing ring is equipped, pedestal 3 and boat
Blank card 7 coordinates with the sealing of shell 5 respectively encapsulates pressure detecting element 6.
Capillary 4 is stainless steel, and inwall, which is coated with one layer of TiAlN overlay film, capillary 4, is filled with low-melting alloy.
The structure of the high-temperature fusant pressure sensor of embodiment 1~4 is all as described above, and difference is to fill in capillary 4
The compositing formula of low-melting alloy be slightly different.
The low-melting alloy of embodiment 1~4 is prepared as follows：
According to the formula of table 1, the lead of formula ratio first is placed in crucible, is heated to 330 DEG C, then adds formula ratio
Thallium, it is to be melted it is uniform after add the tin and indium of formula ratio, the gallium of formula ratio is eventually adding after fusing is uniform.In preparation process
Otherwise it is open close to enter to protect gas nitrogen.After the melting completely of five kinds of components, gradually cool down, when temperature drops to 25 DEG C, add covering
Agent fluorine carbon (carbon tetrafluoride is removed during subsequent filter), the addition of embodiment 1~4 is respectively gallium, indium, tin, lead and thallium gross mass
3%th, 2%, 2%, 2%.After the completion of whole preparation process, product just can obtain the low of clean free from admixture by filtering or washing
Melting alloy.
The composition of raw materials percentage by weight of the liquid alloy of 1 embodiment of table 1~4
The physical property of the low-melting alloy of testing example 1~4, as a result as shown in table 2.As shown in Table 2, it is of the invention
Liquid alloy has advantages below：1st, as little as -20 DEG C of fusing point, especially as little as -22.4 DEG C of embodiment 1；2nd, boiling point is more than 1850
DEG C, the problem of being volatilized without similar mercury；3rd, although density and viscosity do not reach the level of mercury, but can be to be used as work
Medium normal use；4th, surface tension is larger, and wetability is poor, relative to mercury mobility more preferably.
Physical property at 20 DEG C of the liquid alloy of the embodiment 1~4 of table 2
Using the low-melting alloy of preferred embodiment 1 as object, its physical property at 500 DEG C is further tested, is tied
Fruit is as shown in table 3.As shown in Table 3, at 500 DEG C, density, viscosity, thermal conductivity and the surface tension of the liquid alloy of embodiment 1
It is very few etc. technical indicator and 20 DEG C of phase differences, do not change.
The physical property of the embodiment 1 of table 3 at different temperatures
The low-melting alloy that to sum up high-temperature fusant pressure sensor of the invention is used has that fusing point is low, mobility is good, boiling
The high not volatile, safety non-toxic of point, it is nonflammable, non-explosive the advantages of, and with change density, viscosity, the thermal conductivity of temperature
Do not changed with the technical indicator such as surface tension, it is ensured that the security of high-temperature fusant pressure sensor, stability and accurate
Property.
Claims (8)
1. a kind of environment-friendly high-temperature melt force sensor, it includes diaphragm, capillary and pressure detecting element, and its feature exists
In it also includes screw rod, pedestal, shell and aerial plug-in unit；The diaphragm is connected to the front end of the screw rod and by the screw rod
Front end is closed, and the rear end of the screw rod is connected with the front end of the pedestal, and the pedestal is installed on the front end of the shell, described
Pressure detecting element is connected to the pedestal rear end, the capillary through the screw rod and the pedestal and by the diaphragm with
The pressure detecting element connection, the aerial plug-in unit is installed on the housing and electrically connected with the pressure detecting element；
Low-melting alloy is filled with the capillary, by weight percentage, described low-melting alloy includes：Gallium 55~
65%th, indium 16~22%, tin 10~15%, lead 2~5% and thallium 1~3%.
2. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that described low-melting alloy bag
Include：Gallium 58~65%, indium 16~22%, tin 10~15%, lead 3~5% and thallium 2~3%.
3. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that outside described low-melting alloy
Covered with coverture fluorine carbon, the amount of coverture fluorine carbon is 1~5%, preferably the 2~3% of gallium, indium, tin, lead and thallium gross mass.
4. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that the capillary is stainless steel
Material and inwall is coated with one layer of TiAlN overlay film.
5. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that the pressure detecting element is
The integrated formed structure sintered by strain gauge and elastomer.
6. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that the pressure detecting element with
The pedestal is welded by argon arc welding machine.
7. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that the pressure detecting element with
Chamber is left between the pedestal, the chamber is used for the contact area for expanding liquid and pressure detecting element in capillary.
8. environment-friendly high-temperature melt force sensor as claimed in claim 1, it is characterised in that the pedestal and the aviation
A circle groove is respectively equipped with around plug-in unit and sealing ring is equipped, the pedestal and the aerial plug-in unit respectively with the shell
Sealing, which coordinates, encapsulates the pressure detecting element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184224.6A CN106969869A (en) | 2017-03-24 | 2017-03-24 | Environment-friendly high-temperature melt force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184224.6A CN106969869A (en) | 2017-03-24 | 2017-03-24 | Environment-friendly high-temperature melt force sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106969869A true CN106969869A (en) | 2017-07-21 |
Family
ID=59330073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710184224.6A Pending CN106969869A (en) | 2017-03-24 | 2017-03-24 | Environment-friendly high-temperature melt force sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN106969869A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612641A (en) * | 2019-01-30 | 2019-04-12 | 杭州坦布科技有限公司 | A kind of sealing property of ball valves test equipment and detection method |
| CN109991402A (en) * | 2019-04-29 | 2019-07-09 | 北京化工大学 | A kind of confining liquid formula polymer P VT relation test device |
| CN112629741A (en) * | 2020-11-18 | 2021-04-09 | 上海申狮物联网科技有限公司 | Environment-friendly high temperature melt pressure transmitter |
| CN114923621A (en) * | 2022-03-09 | 2022-08-19 | 上海申狮物联网科技有限公司 | Cavity type mounting structure high-temperature melt pressure sensor |
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| EP1477786A1 (en) * | 2003-05-15 | 2004-11-17 | Gerd Speckbrock | Use of metallic gallium alloys as an expansion liquid in thermometers |
| CN201488849U (en) * | 2009-04-24 | 2010-05-26 | 上海皓鹰测控技术有限公司 | Combined high-temperature fusant pressure transmitter |
| CN102937500A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Automatic zero setting pressure transmitter for high-temperature melt |
| CN203705112U (en) * | 2014-01-24 | 2014-07-09 | 上海皓力德测控技术有限公司 | High temperature melt pressure sensor |
| CN104180916A (en) * | 2014-08-20 | 2014-12-03 | 嘉兴福宁医疗器械有限公司 | Mercury-free glass thermometer and production method thereof |
| CN105671394A (en) * | 2016-01-22 | 2016-06-15 | 上海洛丁森工业自动化设备有限公司 | Gallium liquid metal material and application of gallium liquid metal material to teletransmission pressure and different pressure transmitter |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1477786A1 (en) * | 2003-05-15 | 2004-11-17 | Gerd Speckbrock | Use of metallic gallium alloys as an expansion liquid in thermometers |
| CN201488849U (en) * | 2009-04-24 | 2010-05-26 | 上海皓鹰测控技术有限公司 | Combined high-temperature fusant pressure transmitter |
| CN102937500A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Automatic zero setting pressure transmitter for high-temperature melt |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612641A (en) * | 2019-01-30 | 2019-04-12 | 杭州坦布科技有限公司 | A kind of sealing property of ball valves test equipment and detection method |
| CN109612641B (en) * | 2019-01-30 | 2020-09-08 | 博纳斯威阀门股份有限公司 | Ball valve sealing performance testing equipment and detection method |
| CN109991402A (en) * | 2019-04-29 | 2019-07-09 | 北京化工大学 | A kind of confining liquid formula polymer P VT relation test device |
| CN112629741A (en) * | 2020-11-18 | 2021-04-09 | 上海申狮物联网科技有限公司 | Environment-friendly high temperature melt pressure transmitter |
| CN114923621A (en) * | 2022-03-09 | 2022-08-19 | 上海申狮物联网科技有限公司 | Cavity type mounting structure high-temperature melt pressure sensor |
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Application publication date: 20170721 |
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| WD01 | Invention patent application deemed withdrawn after publication |