CN108387320A - A kind of permanent mold casting quick response temperature thermocouple - Google Patents
A kind of permanent mold casting quick response temperature thermocouple Download PDFInfo
- Publication number
- CN108387320A CN108387320A CN201810126759.2A CN201810126759A CN108387320A CN 108387320 A CN108387320 A CN 108387320A CN 201810126759 A CN201810126759 A CN 201810126759A CN 108387320 A CN108387320 A CN 108387320A
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- China
- Prior art keywords
- thermocouple
- metal joint
- mold
- metal
- quick response
- Prior art date
- 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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/023—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples provided with specially adapted connectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/146—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations arrangements for moving thermometers to or from a measuring position
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Continuous Casting (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of permanent mold casting quick response temperature thermocouples; including two thermocouple wires; in protection sleeve pipe; it is connected by metal joint in hot junction; metal joint is frustum cone structure, and longitudinal section is trapezoidal, and trapezoidal center is hollow structure; the contact site of metal joint and mold thermometer hole is smooth plane, while being also machined to smooth flat with the corresponding contact surface of metal joint in mold thermometer hole；High-temperature seal adhesive is equipped between metal joint rear, thermometer hole inner wall and protection sleeve pipe.Heat after the present invention makes mold heat up is transmitted to rapidly thermocouple, realizes quick response of the thermocouple to temperature.Protect the smooth contact surface of thermo-electric metal connector not affected by environment.Metal joint insulate with the thermocouple part in addition to thermocouple wire, avoids interference.
Description
Technical field
The invention belongs to Casting Equipment technical fields, more particularly, to a kind of permanent mold casting quick response thermometric thermoelectricity
It is even, it is measured for the mold temperature to permanent mold casting process.
Background technology
Thermocouple is common temperature element in temperature measuring instrument, the basic principle of thermocouple temperature measurement be two kinds of differences at
Part material conductor form closed circuit, when both ends when temperature gradient, in circuit there are just having electric current to pass through, at this time both ends it
Between there is measurable thermo-electromotive force.The homogeneous conductor of two kinds of different components is thermode, and the higher one end of temperature is work
End or measurement end, hot junction, the lower one end of temperature are free end or reference end, cold end.According to thermo-electromotive force and temperature
Functional relation, in free end temperature at 0 DEG C under conditions of obtain thermocouple indexing table, different thermocouples has difference
Phasing meter.If there is the temperature difference working end of thermocouple with reference end, display instrument can indicate the heat that thermocouple generates
Temperature value corresponding to potential.The thermoelectricity of thermocouple moves heat and will increase as measurement end temperature increases, its size and heat
Galvanic couple material is related with the temperature at both ends.
Common thermocouple can be divided into the non-standard thermocouple two major classes of standard hot even summation.Standard couple refers to national standard
The relationship, allowable error and the thermocouple for having unified standard phasing meter of its thermoelectrical potential and temperature are defined, it has mating with it
Display instrument it is alternative.Nonstandardized technique thermocouple is mainly used for the measurement of certain special occasions.Standardized thermocouple China
From 1 day January in 1988, thermocouple and thermal resistance were all produced by IEC international standards, and specified seven kinds of S, B, E, K, R, J, T
Standardized thermocouple is China's Uniting type thermocouple.Common thermocouple model thermocouple Graduation Number thermode materials'use temperature
Spending (DEG C) is：S：Platinum-rhodium alloy (rhodium content 10%), 0-1600 DEG C of pure platinum；R：Platinum-rhodium alloy (rhodium content 13%), pure platinum 0-
1600℃；B：Platinum-rhodium alloy (rhodium content 30%), 0-1800 DEG C of platinum-rhodium alloy (rhodium content 6%)；K：0-1300 DEG C of nickel chromium triangle nisiloy；
T：0-350 DEG C of fine copper cupro-nickel；J：0-+500 DEG C of iron cupro-nickel；N：0-+800 DEG C of nickel chromium triangle tantnickel silicon；E：0-600 DEG C of nickel chromium triangle cupro-nickel.
In the Foundry Production of modernization, when using Countergravity casting methods such as low pressure, differential pressure, extruding, mold preheat,
In mold filling and solidification, cooling procedure, very high requirement is proposed to the accuracy of temperature control, and the premise of accurate temperature controlling is temp measuring system
Mold can be directed to or melt temperature makes quick response, and feed back to control system.And the mold filling and solidification of casting (fills soon very much
Type is usually completed in several seconds, is set in tens seconds and is completed).Higher want thus is proposed to the response time of temp measuring system
It asks.The thermocouple of industry thermometric at present, essential structure include thermocouple silk material, insulation tube, protection pipe and terminal box etc., heat
Thermocouple wire welds to form temperature measurement node point in hot junction, and rear end is separately connected compensating end, and thermocouple wire is close loaded on insulating materials filling
In big envelope pipe, when measurement, casing outer end is usually additionally provided with protection pipe, and metal sleeve leading portion is contacted testee, testee
When being higher than metal sleeve temperature, heat is passed with the sequence of testee-casing-insulating materials (or air)-temperature measurement node point
It leads, so that temperature measurement node point is reached temperature identical with testee, then measure, during being somebody's turn to do, since heat passes through metal
Casing and insulating materials (or air) need the regular hour, and the thermal conductivity of especially insulating materials or air is very low, therefore makes
At existing armoured thermocouple low-response, root it is documented that, traditional thermocouple common response time at 10 seconds or more, nothing
Method meets thermometric and the temperature control requirement of modernization Foundry Production.
Invention content
In order to solve the above technical problems, the present invention provides a kind of permanent mold casting quick response temperature thermocouples.
The complete technical solution of the present invention includes：
A kind of permanent mold casting quick response temperature thermocouple, including two thermocouple wires, used in two thermocouple wires
Material is respectively NiCr alloys and NiSi alloys, and thermocouple wire is located in protection sleeve pipe, is filled with insulating materials in casing, two
Thermocouple wire is connected in hot junction by metal joint, there is felt pad between metal joint and casing, it is characterised in that：
The metal joint is frustum cone structure, and longitudinal section is trapezoidal, wherein trapezoidal upper bottom surface and two central planes is and mold
Contact surface, it is hollow structure, metal joint and mold thermometric that the junction at two waists and upper bottom, which uses round-corner transition, trapezoidal center,
The contact site in hole is smooth plane, while being also machined to smooth put down in mold thermometer hole with the corresponding contact surface of metal joint
Face；
The trapezoidal bottom surface length of metal joint is more than protection sleeve pipe outer diameter, and thermometric hole depth is trapezoidal more than metal joint
Height, between metal joint rear, thermometer hole inner wall and protection sleeve pipe be equipped with high-temperature seal adhesive；
The driving mechanism of the thermocouple rear end connection metal mold, and as metal mold die sinking/mould assembling action is realized
Advanced in unison retreats.
The thermocouple assembly is used for the casting device with water cooling or water mist cold structure.
The roughness of the metal joint and the contact surface of mold thermometer hole is Ra0.2-Ra0.5.
The thermocouple protective casing is metal material.
The present invention compared with the existing technology the advantages of be：Using flat surface contact manner, tested mold and thermoelectricity are increased
Contact area between idol can completely avoid the biography being contaminated on contact surface or between air gap influence mold and thermocouple
Heat, the heat after making mold heat up are transmitted to rapidly thermocouple, realize quick response of the thermocouple to temperature.It is applied outside thermocouple
The high-temperature seal adhesive added, allows thermocouple to be fixed in thermometer hole, avoids dust or water mist pair in severe working environment
The pollution of contact surface, while thermocouple rear end is directly connected to the driving mechanism of metal mold, with casting mold forward-reverse, ensures
Contact precision.
Description of the drawings
Fig. 1 is the quick response temperature thermocouple structural schematic diagram of the present invention.
In figure：1- casings, 2- insulating materials, 3- thermocouple wires, 4- felt pads, 5- metal joints, 6- molds, 7- high temperature are close
Sealing.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and detailed description.
Quick response thermocouple disclosed by the invention, including two thermocouple wires 3, two thermocouple wire material therefor difference
For NiCr alloys and NiSi alloys, thermocouple wire is located in protection sleeve pipe 1, and insulating materials 2, two thermocouples are filled in casing
Silk is connected in hot junction by metal joint 5, there is felt pad 4 between metal joint and casing.
In thermometric, thermometric such as is carried out to the mold of aluminum alloy low-pressure casting, metal joint is inserted directly into the thermometric of mold 6
Kong Zhongyu mold walls contact, and heat is directly transferred to metal joint by mold wall when thermometric, at this time metal joint and mold wall
Contact point that is, thermocouple hot junction or temperature measurement node point, during this, need to make the temperature of metal joint to be rapidly achieved
Temperature identical with mold thermometer hole, thus need to realize the quick heat exchange between outer mold wall and metal joint.According to heat transfer
Principle, the contact area both in diabatic process, the smooth degree on contact surface, air gap existing for centre etc., has heat transfer
Important influence, conventional thermocouple is in thermometric, generally use casing and measured object point contact, and in complicated working environment
Under, contact point be easy to by environment dust or steam covering, form thermal barrier coatings between mold and casing, make casing-contact
Point cannot rapid heating and cooling.And since, there is also insulating materials and gas, heat is transmitted to survey between contact point and temperature measurement node point
The time of warm node is longer, and temperature identical with mold cannot be rapidly brought up to by resulting in pyrometer fire-end.The present invention is in order to improve
The response time of thermocouple is processed into smooth round platform planar junction in the front end of metal joint with the contact site of mold
Structure, while smooth flat is also machined on mold with the corresponding contact surface of thermocouple, the roughness Ra 0.2-Ra0.5 on surface expands
Big contact area can completely avoid and be contaminated on contact surface or air gap influences heat transfer between mold and thermocouple, makes mould
Heat after tool heating is transmitted to rapidly thermocouple, realizes quick response of the thermocouple to temperature.
A kind of preferred scheme is that metal joint entirety longitudinal section is designed as trapezoidal shape, wherein trapezoidal upper bottom surface with
Two central planes are the contact surface with mold, and the roughness on surface is similarly Ra0.2-Ra0.5.The junction at two waists and upper bottom is using circle
Angle transition, stress when reducing temperature change at this improve the service life, and prevent the dilation caused by temperature change from leading
Mutagens shape prevents contact surface from being tightly bonded.
Preferred scheme is：Trapezoidal centre is hollow structure to be made to connect to significantly reduce the volume of metal joint
Head can reach temperature identical with mold in very short time.
Simultaneously as in the casting process such as low pressure differential pressure, working environment is more severe, is present in entirely in measuring and controlling temp
Casting process needs thermocouple to carry out continuous temperature measurement to whole process, while also to carry out water to mold in mold filling and solidification processes
The cooling of cold or water mist, thus inevitable that steam dust etc. impacts thermocouple, due to the thermocouple of the present invention
Contact surface uses smooth surface, thus the contaminations such as steam dust will seriously reduce the heat conduction efficiency of contact surface, cause to respond
Time lengthening, and reduce the service life of thermocouple, while water mist is sprayed onto on thermo-electric metal connector can reduce its temperature, is reduced
Measurement accuracy.Therefore on this basis, the trapezoidal bottom surface length of metal joint that the present invention designs is more than protection sleeve pipe outer diameter,
And thermometric hole depth is more than the trapezoidal height of metal joint, is equipped between metal joint rear, thermometer hole inner wall and protection sleeve pipe
High-temperature seal adhesive 7；In actual use, it is equivalent to metal joint to be embedded in thermometer hole always, fluid sealant prevents steam dust etc.
Thermo-electric metal joint surface is polluted, and plays certain fixed function to metal joint.Thermocouple rear end connects metal mold
Driving mechanism, and as metal mold die sinking/mould assembling action realizes that advanced in unison retreats.
When casting process thermometric, casting mould molds first, and driving mechanism drives thermocouple and mold advanced in unison, thermoelectricity
Even metal joint resists the thermometer hole of mold, and contact surface is bonded to each other.Subsequent thermo-electric metal connector due to mold thermometer hole
Between temperature difference cause heat to conduct, to make metal joint temperature rise or decline, between two thermocouple wires generate electricity
Potential difference timely responds to temperature.Metal joint insulate with the thermocouple part in addition to thermocouple wire, avoids interference.
The above is only presently preferred embodiments of the present invention, is not imposed any restrictions to the present invention, every according to the present invention
Technical spirit changes any simple modification, change and equivalent structure made by above example, still falls within skill of the present invention
In the protection domain of art scheme.
Claims (4)
1. a kind of permanent mold casting quick response temperature thermocouple, including two thermocouple wires, material used in two thermocouple wires
Material is respectively NiCr alloys and NiSi alloys, and thermocouple wire is located in protection sleeve pipe, and insulating materials, two heat are filled in casing
Thermocouple wire is connected in hot junction by metal joint, there is felt pad between metal joint and casing, it is characterised in that：
The metal joint is frustum cone structure, and longitudinal section is trapezoidal, wherein trapezoidal upper bottom surface and two central planes is connect with mold
It is hollow structure, metal joint and mold thermometer hole that the junction at contacting surface, two waists and upper bottom, which uses round-corner transition, trapezoidal center,
Contact site is smooth plane, while being also machined to smooth flat with the corresponding contact surface of metal joint in mold thermometer hole；
The trapezoidal bottom surface length of metal joint is more than protection sleeve pipe outer diameter, and thermometric hole depth is trapezoidal more than metal joint
Height is equipped with high-temperature seal adhesive between metal joint rear, thermometer hole inner wall and protection sleeve pipe；
The driving mechanism of the thermocouple rear end connection metal mold, and realize and synchronize with metal mold die sinking/mould assembling action
Forward-reverse.
2. a kind of permanent mold casting quick response temperature thermocouple according to claim 1, which is characterized in that described
Thermocouple assembly is used for the casting device with water cooling or water mist cold structure.
3. a kind of permanent mold casting quick response temperature thermocouple according to claim 1 or 2, which is characterized in that institute
The roughness for stating metal joint and the contact surface of mold thermometer hole is Ra0.2-Ra0.5.
4. a kind of permanent mold casting quick response temperature thermocouple according to claim 1 or 3, which is characterized in that institute
The thermocouple protective casing stated is metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126759.2A CN108387320B (en) | 2018-02-08 | 2018-02-08 | A kind of permanent mold casting quick response temperature thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126759.2A CN108387320B (en) | 2018-02-08 | 2018-02-08 | A kind of permanent mold casting quick response temperature thermocouple |
Publications (2)
| Publication Number | Publication Date |
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| CN108387320A true CN108387320A (en) | 2018-08-10 |
| CN108387320B CN108387320B (en) | 2019-07-12 |
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| CN201810126759.2A Active CN108387320B (en) | 2018-02-08 | 2018-02-08 | A kind of permanent mold casting quick response temperature thermocouple |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109719410A (en) * | 2018-12-28 | 2019-05-07 | 无锡英特派金属制品有限公司 | TFT path thermocouple welding assembly method |
| WO2022021881A1 (en) * | 2020-07-29 | 2022-02-03 | 广东伊戈尔智能电器有限公司 | Contact temperature sensor |
| CN117191209A (en) * | 2023-11-07 | 2023-12-08 | 滨州泽郦精密金属科技有限公司 | Quick response temperature thermocouple for metal mold casting |
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| Publication number | Publication date |
|---|---|
| CN108387320B (en) | 2019-07-12 |
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