CN109282911A - High precision measuring temperature probe and high precision measuring temperature instrument - Google Patents
High precision measuring temperature probe and high precision measuring temperature instrument Download PDFInfo
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- CN109282911A CN109282911A CN201811229562.8A CN201811229562A CN109282911A CN 109282911 A CN109282911 A CN 109282911A CN 201811229562 A CN201811229562 A CN 201811229562A CN 109282911 A CN109282911 A CN 109282911A
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 10
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- 239000004519 grease Substances 0.000 claims description 3
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- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 11
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- 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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
-
- 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
Abstract
Present invention discloses a kind of high precision measuring temperature probes, including metal shell, thermometric chip, thermal insulation layer, shell and conducting wire；The bottom of metal shell is equipped with groove, and bottom portion of groove is close to the top of metal shell；Thermometric chip is set in groove, and is reclined with bottom portion of groove；Thermometric chip is connect with conducting wire；Shell is wrapped on the outside of conducting wire；There is gap between one end of shell and the bottom of metal shell, and one end of shell and the bottom end of metal shell are connected by thermal insulation layer.The high precision measuring temperature probe that the present invention designs is planar design, can test the pyrotoxin of various planes, high precision measuring temperature probe can be made to completely attach to pyrotoxin, thermometric effect is more preferable；Thermal insulation layer is increased in high precision measuring temperature probe simultaneously, the reaction time that high precision measuring temperature can be promoted to pop one's head in this way and increase temperature measurement accuracy；Using three-wire system conducting wire, high-precision platinum resistor temperature measuring chip so that high precision measuring temperature probe on temperature measurement accuracy beyond tradition it is very much.
Description
Technical field
The present invention relates to temperature measurer fields, and in particular to a kind of high precision measuring temperature probe and high precision measuring temperature instrument.
Background technique
There are the following problems: temperature measurement accuracy for thermocouple employed in industry and NTC thermistor tester at present
Difference, low precision are mainly reflected in three aspects: being on the one hand probe shape issues, current most of temperature measurer is all only in industry
The temperature etc. of opposite space temperature or certain liquid internal is tested, so the probe head shape that they select is most of all
It is domed formation, and for face temperature test, the head construction of their cheeses just can not be complete with plane pyrotoxin
Full connected, and then cause thermometric temperature inaccurate；Second aspect is chip temperature measurement accuracy problem itself, and temperature measurer is all at present in industry
It is the chip thermometric for selecting thermocouple and NTC thermistor, the precision of thermocouple is typically at ± 1.5 DEG C or more, and NTC is
Nonlinear chip parameter, and then cause in the case where extremely low mild very high temperature, test temperature error amount is bigger.Third party
In terms of face is signal conditioning module, thermometric conversion module before is all fairly simple, lacks the temperature of corresponding hardware and software
Compensation mechanism also lacks and is directed to portable temperature measurement module power management module, while being directed to the fault detection mechanism of system
Also not perfect；Reaction speed is slow.Reaction speed is also manifested in two aspects slowly: being equally on the one hand temp probe head shape
Problem, industry major part temperature probe are all to use arcuate probe, when test surfaces are the pyrotoxin of plane, their contact
Area is too small, so reaction speed is slow.On the other hand be that internal chip structure causes reaction speed partially slow, thermocouple and
NTC thermistor speed in thermal response itself is partially slow；Stability is poor, and NTC thermistor is with synthetic materials such as zinc oxide
Made of sintering, they, by the influence of ambient temperature variation, will lead to the drift of chip inherent parameters in follow-up work, into
And cause the unstable of parameter.
Summary of the invention
The present invention proposes a kind of high precision measuring temperature probe and high precision measuring temperature instrument, it is intended to which it is poor to solve temperature measurement accuracy, is surveying
During temperature the problem of heat loss.
The present invention proposes a kind of high precision measuring temperature probe, including metal shell, thermometric chip, thermal insulation layer and conducting wire；Metal
The bottom of shell is equipped with groove, and bottom portion of groove is close to the top of metal shell；Thermometric chip is set in groove, and and bottom portion of groove
It reclines；Thermometric chip is connect with conducting wire；Shell is wrapped on the outside of the conducting wire；One end of the shell and the metal shell
There is gap between bottom, and one end of the shell is connect with the bottom end of the metal shell by the thermal insulation layer.
Further, the top of metal shell is plane.
Further, high precision measuring temperature probe further includes Heat Conduction Material, and Heat Conduction Material wraps up thermometric chip exterior, heat conduction material
Material is set in groove and contacts with bottom portion of groove.
Further, Heat Conduction Material includes heat-conducting silicone grease.
Further, thermal insulation layer is wrapped in one end of shell and the outside of metal shell, and the top of metal shell is exposed
In outside thermal insulation layer.
Further, shell is heat-resisting material.
Further, thermal insulation layer is insulating materials.
Further, thermometric chip includes platinum resistance.
Further, conducting wire includes three-wire system conducting wire, and one in three-wire system conducting wire is used as temperature-compensating.
The present invention also proposes a kind of high precision measuring temperature instrument, is equipped with above-mentioned high precision measuring temperature and pops one's head in.
It is planar design the invention has the advantages that: high precision measuring temperature probe, the pyrotoxin of various planes can be tested, it can
So that high precision measuring temperature probe is completely attached to pyrotoxin, thermometric effect is more preferable；Simultaneously high precision measuring temperature probe increase every
Thermosphere, the reaction time that high precision measuring temperature can be promoted to pop one's head in this way and increase temperature measurement accuracy；Use three-wire system conducting wire, high-precision
Platinum resistor temperature measuring chip so that high precision measuring temperature probe on temperature measurement accuracy beyond tradition it is very much.
Detailed description of the invention
The structural schematic diagram of Fig. 1 one embodiment of high precision measuring temperature probe of the present invention；
Fig. 2 high precision measuring temperature of the present invention is popped one's head in the structural schematic diagram of another embodiment；
The structural schematic diagram of Fig. 3 one embodiment of high precision measuring temperature instrument of the present invention；
The functional block diagram of Fig. 4 one embodiment of high precision measuring temperature instrument of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
Referring to Fig.1, propose high precision measuring temperature of the present invention 6 one embodiments of probe, including metal shell 1, thermometric chip 2, every
Thermosphere 3 and conducting wire；The bottom of metal shell 1 is equipped with groove, and bottom portion of groove is close to the top of metal shell 1；Thermometric chip 2 is set to
In groove, and contacted with bottom portion of groove；The opposite side that thermometric chip 2 is contacted with bottom portion of groove is connect with conducting wire；Shell 5 is wrapped in
On the outside of conducting wire；There are gap 8, and the bottom of one end of shell 5 and metal shell 1 between one end of shell 5 and the bottom of metal shell 1
End is connected by thermal insulation layer 3.When measuring temperature, temperature can lead to heat loss to outside diffusion, and partial heat can edge
Shell 5 spread, being equipped with gap 8 in one end of metal shell 1 and shell 5 can prevent heat from spreading along shell 5, so that warm
Degree focuses primarily upon the top of metal shell 1, and then incoming thermometric chip 2, reduces scattering and disappearing for heat, and measurement can be improved
Precision.
The top of metal shell 1 is plane, and the temperature probe 6 of existing temperature measurer is mostly arcwall face, when measuring temperature,
Temperature probe 6 and pyrotoxin contact area are smaller, and measuring speed is relatively slow and since the lost of heat causes measurement accuracy inaccurate
Really, the top of the metal shell 1 of high precision measuring temperature of the present invention probe 6 can completely and pyrotoxin compared with existing temperature probe 6
Contact, the temperature for measuring pyrotoxin that can be faster more quasi-.
Referring to Fig. 2,6 another embodiments of high precision measuring temperature probe of the present invention are proposed, high precision measuring temperature probe 6 further includes thermally conductive
Material 4, Heat Conduction Material 4 wrap up outside thermometric chip 2, and Heat Conduction Material 4 is set in groove and contacts with bottom portion of groove.In this implementation
In example, when measuring temperature, the top of metal shell 1 is contacted with pyrotoxin, and temperature passes to groove by the top of metal shell 1
Thermometric chip 2 is passed in bottom again, and then the temperature measured needed for collecting, but during measuring temperature, if thermometric chip 2
There are gaps with the groove of 1 bottom of metal shell, then portion temperature can be made not pass to thermometric chip 2, and can not be real-time
Temperature is measured, the precision inaccuracy of measurement is caused, therefore is wrapped up outside thermometric chip 2 with Heat Conduction Material 4, then by heat conduction material
Material 4 fills full groove, does not have gap between groove, and the top of metal shell 1 can be with real-time transmission to survey when measuring temperature
Warm chip 2, and scattering and disappearing for heat is reduced, improve the speed and measurement accuracy of measurement.
In the present embodiment, Heat Conduction Material 4 is heat-conducting silicone grease, and heating conduction is good, and thermometric chip 2 can be made real-time
Temperature is measured, and scattering and disappearing for heat can be reduced.In further embodiments, Heat Conduction Material 4 can be selected heat-conducting silica gel sheet,
Thermally conductive silica gel cloth, heat-conducting glue band etc..
Thermal insulation layer 3 is wrapped in one end of shell 5 and the outside of metal shell 1, and the top of metal shell 1 expose to it is heat-insulated
Outside layer 3, shell 5 and metal shell 1 can be linked together by thermal insulation layer 3, and deposited between shell 5 and metal shell 1
It in gap 8, between the 1-2mm of the range in gap 8, can prevent during thermometric, the temperature of metal shell 1 can be along shell
5 diffusions, there are the temperature that metal shell 1 can be effectively prevented in gap 8 to be diffused into shell 5 between such metal shell 1 and shell 5
On lead to scattering and disappearing for heat, and the temperature for being also possible to prevent metal shell is outwardly spread, so that high precision measuring temperature is visited
The precision of first 6 measurement temperature is higher more acurrate.In further embodiments, thermal insulation layer 3 is set to one end and the metal shell of shell 5
Between 1, and thermal insulation layer is connect with one end of shell 5 and metal shell 1 respectively.In the present embodiment, shell 5 is led for protecting
Line prevents conducting wire abrasion the phenomenon that leaking electricity, and shell 5 is heat-resisting material, such as ceramic material, epoxy plate etc., can be with
It prevents during thermometric, temperature is up spread along metal shell 1, so that 5 internal temperature of shell increases, conducting wire also can
Heated, temperature rising can be such that conducting wire aoxidizes in joint, and resistance heating increases, and will lead to joint repeatedly and blow, simultaneously
Temperature raising can be such that conducting wire sag increases, and crossed crossing distance is caused not enough to discharge.Therefore shell 5 is that heat-resisting material can be with
It avoids generating the above phenomenon, improves safety, and thermometric process can support metal shell 1 and carry out thermometric, prevent convenient for operation
Only metal shell 1 is mobile.
Thermal insulation layer 3 is insulating materials, and in the present embodiment, the main material of thermal insulation layer 3 is Teflon plastic cement, in thermometric mistake
The top of Cheng Zhong, metal shell 1 are contacted with pyrotoxin, and temperature can be spread along metal shell 1 to the direction of shell, lead to heat
Scatter and disappear, and setting thermal insulation layer 3 in the side in metal shell 1 can be in thermometric, and top and the pyrotoxin of metal shell 1 connect
Touching, and temperature is gathered in the top of metal shell 1, reduces scattering and disappearing for heat, so that the precision of measurement is more acurrate, and can be with
It avoids the conductor temperature inside shell 5 excessively high and reduces the precision measured.
In the present embodiment, thermometric chip 2 is platinum resistance, and the temperature measurement accuracy of platinum resistance is higher, and highest accuracy is up to ten thousand
/ mono- degree Celsius, within the scope of -273.34~630.74 DEG C, it is the reference thermometer for reappearing international practical temperature scale.Not only
Reaction time and the speed that high precision measuring temperature probe 6 can be promoted, more can increase the stability of high precision measuring temperature probe 6.Another
In some embodiments, thermometric chip 2 be thermocouple, thermocouple by two kinds of different materials groups of metal filaments at.Two kinds of wires
One end welds together, and forms working end, is placed at dut temperature；The other end is known as free end, is connected with measuring instrumentss, is formed
One loop.When the temperature difference of working end and free end, it is (existing see thermoelectric just to will appear thermo-electromotive force in circuit
As).When free end temperature is fixed (such as 0 DEG C), the electromotive force that thermocouple generates just is determined by the temperature of working end.Thermocouple
Type has as many as tens of kinds.Some thermocouples can survey up to 3000 DEG C of high temperature, and some thermocouples are capable of measuring close to absolute zero
Low temperature.
Conducting wire includes three-wire system conducting wire, and one in the three-wire system is used as temperature-compensating, eliminates the influence of conductor resistance,
The temperature data that three-wire system traverse survey comes out has the characteristics that more accurate ground.Three-wire system: it is required that three conductor cross-sections drawn
Long-pending and length is all the same, and the circuit for measuring platinum resistance is usually unbalanced bridge, an arm resistance of the platinum resistance as electric bridge,
By the power end of one piece-root grafting of conducting wire to electric bridge, remaining two bridge arms and bridge arm adjacent thereto being coupled with where platinum resistance
On, when bridge balancing, the variation of conductor resistance does not have any influence to measurement result, and thus eliminating the need wire line resistance
Bring measurement error, but it is necessary for full equal arm bridge, it otherwise can not completely eliminate the influence of conductor resistance.Using three lines
System can greatly reduce conductor resistance bring additive error, industrially be generally used three-wire system connection.In other embodiments
In, four-wire system conducting wire can be used, measurement data is more acurrate, but connects the high precision measuring temperature probe 6 that preparation method is worked it out using three lines
It can be used in the environment that measurement range is narrow or conducting wire is long, and be just that conducting wire is long, the temperature measured will not occur
Value because of the changed feature of the long numerical value of conducting wire, it is advantageous to use three-wire system conducting wire.
Referring to Fig. 3 and Fig. 4, the present invention also proposes a kind of high precision measuring temperature instrument, is equipped with above-mentioned high precision measuring temperature probe 6, high
Precision thermometer further includes thermometric main body 7, and thermometric main body 7 includes conversion module 11, main control module 12, display module 13 and route
Plate；Conversion module 11, main control module 12 and display module 13 and circuit board electrical connection；The opposition that conducting wire is connect with thermometric chip 2
End is connect with conversion module 11；The signal output end of thermometric chip 2 is connect with the signal input part of conversion module 11, conversion module
11 signal output end is connect with the signal input part of main control module 12, the signal output end and display module 13 of main control module 12
Signal input part connection.The analog signal of the temperature of 6 measurement of high precision measuring temperature probe is transmitted to conversion module 11, by conversion
The analog signal of the temperature of 6 measurement of high precision measuring temperature probe is converted to digital signal by module 11, and then conversion module 11 will count
Word signal is transferred to main control module 12, and digital signal is carried out software temperature compensation algorithm and carried out to digital signal by main control module 12
Processing, finally shows the temperature of measurement on display module 13.It can intuitively see the temperature of testee, and pass through
Software temperature compensation algorithm compensates the temperature scattered and disappeared in measurement process, so that the temperature of measurement is more accurate.
High precision measuring temperature instrument is additionally provided with key module 14, and key module 14 is electrically connected with main control module 12, passes through key mould
The functions such as a key switch machine, back lighting, temperature data storage and the inquiry of historical data may be implemented in block 14, and a key switch machine can
To save the electricity of high precision measuring temperature instrument, open when in use, without using when close, and being equipped with back lighting can be with
Convenient for night time operation, the temperature of testee can be clearly seen on display module 13, temperature data storage function is pair
The data for measuring the temperature of object are stored, and are made convenient for passing through the inquiry of historical data function during trailer record to needs
It is inquired with the data of record；And the upper limit value and lower limit value of temperature alarming threshold value can be manually set, when temperature is more than
Corresponding threshold range realizes alarm；It can also be realized degree Celsius by key module 14 and the switching of degrees Fahrenheit.In the present embodiment
In, high precision measuring temperature instrument is additionally provided with power module 15, and continual and steady power supply is provided for high precision measuring temperature instrument, guarantees that high-precision is surveyed
The normal work of Wen Yi can charge to power module 15 by wired mode, such as pass through the external electricity of USB interface
Source can also charge wirelessly.
Beneficial effects of the present invention: high precision measuring temperature probe is planar design, can test the pyrotoxin of various planes,
High precision measuring temperature probe can be made to completely attach to pyrotoxin, thermometric effect is more preferable；It is increased simultaneously in high precision measuring temperature probe
Insulating layer, the reaction time that high precision measuring temperature can be promoted to pop one's head in this way and increase temperature measurement accuracy；Use three-wire system conducting wire, high-precision
Platinum resistor temperature measuring chip so that high precision measuring temperature probe on temperature measurement accuracy beyond tradition it is very much.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of high precision measuring temperature probe, which is characterized in that including metal shell, thermometric chip, thermal insulation layer, shell and conducting wire；
The bottom of the metal shell is equipped with groove, and the bottom portion of groove is close to the top of the metal shell；The thermometric chip is set
In in the groove, and recline with the bottom portion of groove；The thermometric chip is connect with the conducting wire；The shell is wrapped in institute
It states on the outside of conducting wire；There are gap, and one end of the shell and institute between one end of the shell and the bottom of the metal shell
The bottom end for stating metal shell is connected by the thermal insulation layer.
2. high precision measuring temperature is popped one's head according to claim 1, which is characterized in that the top of the metal shell is plane.
3. high precision measuring temperature probe according to claim 1, which is characterized in that the high precision measuring temperature probe further includes leading
Hot material, the Heat Conduction Material wrap up the thermometric chip exterior, the Heat Conduction Material be set in the groove and with it is described recessed
Trench bottom contact.
4. high precision measuring temperature probe according to claim 3, which is characterized in that the Heat Conduction Material includes heat-conducting silicone grease.
5. high precision measuring temperature probe according to claim 1, which is characterized in that the thermal insulation layer is wrapped in the shell
The outside of one end and the metal shell, and exposed to outside the thermal insulation layer at the top of the metal shell.
6. high precision measuring temperature probe according to claim 5, which is characterized in that the shell is heat-resisting material.
7. high precision measuring temperature probe according to claim 1, which is characterized in that the thermal insulation layer is insulating materials.
8. high precision measuring temperature probe according to claim 1, which is characterized in that the thermometric chip includes platinum resistance.
9. high precision measuring temperature probe according to claim 1, which is characterized in that the conducting wire includes three-wire system conducting wire, institute
One in three-wire system conducting wire is stated as temperature-compensating.
10. a kind of high precision measuring temperature instrument, which is characterized in that be equipped with the described in any item high precision measuring temperature probes of claim 1-9.
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| CN201811229562.8A CN109282911A (en) | 2018-10-22 | 2018-10-22 | High precision measuring temperature probe and high precision measuring temperature instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243652A (en) * | 2019-03-15 | 2019-09-17 | 湖南品胜生物技术有限公司 | A kind of control system for full-automatic dyeing machine |
| CN115295906A (en) * | 2022-09-30 | 2022-11-04 | 盐城君乐达电器科技有限公司 | Temperature measuring device and temperature measuring method |
| CN115597736A (en) * | 2022-09-07 | 2023-01-13 | 南京高华科技股份有限公司（Cn） | Quick-response film platinum resistor temperature sensor and preparation method thereof |
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