CN109456737A - A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes - Google Patents
A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes Download PDFInfo
- Publication number
- CN109456737A CN109456737A CN201811340204.4A CN201811340204A CN109456737A CN 109456737 A CN109456737 A CN 109456737A CN 201811340204 A CN201811340204 A CN 201811340204A CN 109456737 A CN109456737 A CN 109456737A
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- Prior art keywords
- magnesia powder
- particle
- powder
- temperature sensor
- particle magnesia
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
-
- 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
- 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
- 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
- G01K7/183—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 characterised by the use of the resistive element
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The present invention relates to a kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes, the heat filling includes the first particle magnesia powder and the second particle magnesia powder that mass ratio is 2~4:2, and the temperature sensor includes shell, the temperature detecting element for being arranged in the enclosure interior and the filling heat filling between the temperature detecting element inside housings.Heat filling provided by the present invention is in sensor, make time constant down to 2.55s, compared to the sensor of conventional oxidation magnesium powder filling, time constant is greatly lowered, and excellent performance is still maintained in extreme environments such as vibration, high/low-temperature impacts, can be applied to air appliance, industrial temperature measurement and aircraft environmental control system etc..
Description
Technical field
The present invention relates to aircraft electric technical field more particularly to a kind of heat filling for temperature sensor, include
Its temperature sensor and purposes.
Background technique
In aircraft industry application, temperature sensor pursues quick time constant with faster response system equipment temperature, and
It is the most widely used to become temperature sensor product with its excellent stability, high-termal conductivity and electrical insulating property for magnesia powder
Packing material.But because existence is not of uniform size independent between magnesium oxide powder or the hole that interconnects, hole get over macropore
Heat transfer between the higher powder of gap rate is poorer, and then influences the time constant of sensor.Temperature sensor selects filling at present
There are many magnesia powder type, but since the structure of the intrinsic characteristic combination temperature sensor of powder is specific, filled oxidation
Magnesium porosity with higher seriously restricts detector time constant and further increases, and the application technology of magnesia powder is boat
The a great problem in empty sensor field is a key technology in airborne sensor field.
CN204855005U discloses a kind of proof armored platinum resistor temperature sensor of novel improved structure, and the temperature passes
Sensor uses purity to be filled for 95% magnesium oxide insulated particle, fills into protection pipe.The vibration damping bullet of the utility model
Spring, fixed chuck and temperature-measuring resistance element setting, so that effectiveness in vibration suppression is preferable, install convenient, temperature detection high sensitivity, thermometric
Range is wide, and convenient for promoting and using, but magnesium oxide particle porosity with higher, the time for influencing the temperature sensor are normal
Number.
CN105764969A discloses a kind of heat conduction particle comprising by by multiple thermally conductive slug particles and organic binder
At least part of insulating materials of composite core and covered composite yarn core that compression shear is mixed with, wherein heat conduction particle
The range of volume resistivity is at least 1 × 104 Ω cm to 1 × 1010 Ω cm, but time constant characteristic is still to be improved.
CN1666303A discloses a kind of band-like or laminar high thermal conductivity insulating member, its manufacturing method, uses this
The electromagnetic equipments such as the electromagnetic coil of high thermal conductivity insulating member and generator with the electromagnetic coil.In the invention, make
For band-like or laminar insulating element, using dispersion has 1W/mK or more in reisn base material and 300W/mK is below
1st particle of thermal conductivity and the material of the 2nd particle with 0.5W/mK or more and 300W/mK thermal conductivity below, to solve
The problems such as in insulating element in the presence of that cannot obtain enough thermal conductivitys or special resin component can only be used, but time
Constant characteristic is still to be improved.
Therefore, a kind of packing material is urgently developed in this field, and the temperature sensor comprising it is made to have the lesser time normal
Number, while can work reliably and with long-term in extreme circumstances.
Summary of the invention
In view of the deficiencies of the prior art, it is filled out one of the objects of the present invention is to provide a kind of for the thermally conductive of temperature sensor
Material, the heat filling include the first particle magnesia powder and the second particle magnesia powder；
The mass ratio of the first particle magnesia powder and the second particle magnesia powder be 2~4:2, such as 2.5:2,3:2,
3.5:2,3.8:2 etc.；
The first particle magnesia powder is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the first particle magnesia powder；
The second particle magnesia is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the second particle magnesia powder.
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 80 mesh of > is 35~42%, example
Such as 35%, 36%, 37%, 38%, 39%, 40%, 41%.
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 140~80 mesh is 35~40%,
Such as 35%, 36%, 37%, 38%, 39% etc..
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 200~140 mesh is 12~
16%, such as 13%, 14%, 15% etc..
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 330~200 mesh is 5~9%,
Such as 6%, 7%, 8% etc..
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 330 mesh of < is 0.5~1.2%,
Such as 0.6%, 0.7%, 0.8%, 0.9%, 1.0,1.1% etc..
In the second particle magnesia powder, the mass percent of the particle magnesia powder of 80 mesh of > is 0.8~1.2%,
Such as 0.9%, 1.0,1.1% etc..
In the second particle magnesia powder, the mass percent of the particle magnesia powder of 140~80 mesh is 14~18%,
Such as 14%, 15%, 16%, 17% etc..
In the first particle magnesia powder, the mass percent of the particle magnesia powder of 200~140 mesh is 30~
36%, such as 31%, 32%, 33%, 34%, 35% etc..
The average grain diameter of first particle magnesia powder provided by the invention is greater than the average grain diameter of the second particle magnesia powder,
The magnesia powder of bulky grain is mixed with short grained magnesia powder according to 2~4:2 of mass ratio, is formed of the present invention
Heat filling, little particle magnesia in the heat filling can uniform adsorption around bulky grain magnesia, generated between powder
Hole reduces between magnesia powder after binding force, then filling to the powder densification degree after temperature sensor will increase, porosity will
Reduce, while the contact area between powder also increases, therefore filled heat filling thermal coefficient will also increase, and be conducive to change
The time constant performance of kind temperature sensor.
Preferably, the mass ratio of the first particle magnesia powder and the second particle magnesia powder is 3:2.
It is obtained thermally conductive when the first particle magnesia powder is mixed with the second particle magnesia powder according to mass ratio 3:2
The heating conduction of filler is optimal, and thermal coefficient is maximum, time constant minimum when temperature sensor is used for, this is because in the ratio
Under, the closest, the gap minimum between particle of the first particle magnesia powder and the accumulation of the second particle magnesia powder.When the first particle
The ratio of magnesia powder is excessive or too small, powder time gap can be made to become larger, and reduces the heating conduction of filler.
Preferably, the first particle magnesia powder is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the first particle magnesia powder.
Preferably, the second particle magnesia is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the second particle magnesia powder.
It, can just after mixing when the size distribution of the first particle magnesia powder and the second particle magnesia powder is as described above
It enough realizes that the perfection of two kinds of particles magnesia powder agrees with, minimizes the gap between magnesia powder, heating conduction maximization, from
And there is shortest time constant by the temperature sensor of its filling, realize optimal response performance.
The second object of the present invention is to provide a kind of temperature sensor, and the temperature sensor includes shell, is arranged in
The temperature detecting element of the enclosure interior and filling are inside housings described in the first purpose between the temperature detecting element
Heat filling.
The heat filling should fill up entire shell, not limit herein for the loading in the housing of heat filling
It is fixed.
Since temperature sensor provided by the invention includes heat filling of the present invention, which has excellent
Heating conduction so that the time constant of the temperature sensor is minimum to be down to 2.55s or so, more common magnesia powder is reduced
50% or more, realize the quick response of temperature sensor.
There is stronger adsorption capacity, while powder and sensor filling part bit device binding force between mixed oxidization magnesium powder powder
Height, powder are more preferable to the fixed effect of sensor internal component, thus can bear in vibration environment 20g vibration magnitude,
It can bear temperature shock 15000 circulations at 290 DEG C to -40 DEG C of low temperature.The reliability of sensor is higher.
The third object of the present invention is to provide a kind of purposes of temperature sensor described in the second purpose, and the temperature passes
Sensor is for air appliance, industrial temperature measurement or aircraft environmental control system.
Compared with prior art, the invention has the following beneficial effects:
(1) heat filling provided by the present invention for temperature sensor is by the first particle magnesia powder and the second particle
Magnesia powder is mixed to get according to the ratio of 2~4:2, when with the mixing of 3:2 ratio, compared with conventional oxidation magnesium powder (such as
Shown in Fig. 2), little particle magnesia powder can be uniformly adsorbed on around bulky grain magnesia powder after mixing, be generated between powder
Reduce magnesia powder gap, compactness increases (as shown in Figure 1) after filling, while the contact area between powder
Also increase, to keep the more common magnesia powder of powder thermal coefficient higher, material thermal conductivity rate faster, makes the temperature comprising it
The time constant of sensor is minimum to be down to 2.55s or so, and more common magnesia powder reduces 50% or more, realizes temperature biography
The quick response of sensor, the time constant for solving temperature sensor can not further increase problem.
(2) small provided by the present invention for the heat filling hole of temperature sensor, porosity is low, hybrid particles magnesia
There is stronger adsorption capacity, while powder and sensor filling part bit device binding force are high between powder powder, powder is in sensor
The fixed effect of portion's component is more preferable, and stability is good, therefore can bear in vibration environment the vibration magnitude of 20g, can bear
290 DEG C to -40 DEG C of low temperature of temperature shock 15000 circulations.The reliability of sensor is higher.
Detailed description of the invention
Fig. 1 is the image of 40 times of amplification under low power magnifying glass of heat filling in the embodiment of the present invention 1.
Fig. 2 is the image for amplifying 40 times under low power magnifying glass of traditional lightweight magnesia powder in comparative example 1 of the present invention.
Specific embodiment
Of the invention for ease of understanding, it is as follows that the present invention enumerates embodiment.Those skilled in the art are it will be clearly understood that the implementation
Example is only to aid in the understanding present invention, should not be regarded as a specific limitation of the invention.
Embodiment 1
The preparation of magnesia powder filling temp sensor:
Prepare heat filling:
The first particle magnesia powder is prepared according to following mass percent:
The second particle magnesia powder is prepared according to following mass percent:
Above-mentioned first particle magnesia powder is mixed with the second particle magnesia powder according to mass ratio 3:2, thermally conductive fill out is obtained
Material.
Above-mentioned heat filling is filled to internal diameter and isDouble redundancy platinum resistance temperature sensor enclosure interior
Between temperature detecting element.
Fig. 1 is that the heat filling that the present embodiment obtains amplifies 40 times of obtained images under low power magnifying glass, as figure shows,
Porosity is small between powder, accumulation is closely knit, contact area is larger between powder.
Embodiment 2
The difference from embodiment 1 is that the mass ratio of the first particle magnesia powder and the second particle magnesia powder is 2:2.
Embodiment 3
The difference from embodiment 1 is that the mass ratio of the first particle magnesia powder and the second particle magnesia powder is 4:2.
Embodiment 4
The difference from embodiment 1 is that preparing the first particle magnesia powder according to following mass percent:
The first particle magnesia powder is prepared according to following mass percent:
Embodiment 5
The difference from embodiment 1 is that preparing the first particle magnesia powder according to following mass percent:
The first particle magnesia powder is prepared according to following mass percent:
Embodiment 6
The difference from embodiment 1 is that preparing the first particle magnesia powder according to following mass percent:
The first particle magnesia powder is prepared according to following mass percent:
Comparative example 1
The traditional lightweight magnesia powder that partial size is 300 mesh is filled to internal diameter and isDouble redundancy platinum resistance temperature
Between temperature detecting element inside sensor housing.
Fig. 2 is 40 times of obtained images of amplification under low power magnifying glass of traditional lightweight magnesia powder in comparative example, with Fig. 1
Comparison is it is found that porosity is larger between powder, accumulation tightness is lower, contact area is smaller between powder.
Performance test:
(1) using under static flow condition, step temperature is the test method of room temperature step to 80 DEG C, measures product
Time constant.
(2) under vibration and under temperature shock environment, test product reliability index.
(a) magnitude 20g is vibrated.
(b) product is placed in pipeline under -40 DEG C and 290 DEG C of temperature environments and carries out temperature shock test, two environment
Conversion time be less than 2s, convert primary for a circulation, 15000 times should be met and recycled.
The performance test results are as shown in table 1.
1 the performance test results summary sheet of table
| Exemplar number | Time constant (s) |
| Embodiment 1 | 2.55 |
| Embodiment 2 | 2.96 |
| Embodiment 3 | 2.88 |
| Embodiment 4 | 2.68 |
| Embodiment 5 | 2.70 |
| Embodiment 6 | 2.68 |
| Comparative example 1 | 5.11 |
As shown in Table 1, the time constant of the temperature sensor of Examples 1 to 6 is respectively less than 3s, minimum 2.55s, relatively compares
The time constant of the temperature sensor of example 1 is greatly reduced, and can at most reduce by 50% or more.This is because provided by the invention thermally conductive
Filler compares traditional lightweight magnesia powder, and porosity is smaller between powder, accumulation is more closely knit, contact area is bigger between powder, therefore
The thermal coefficient of the heat filling is bigger, so that temperature sensor be made to have lesser time constant.
Comparative example 1~3 is it is found that when the first particle magnesia powder and the second particle magnesia powder are according to mass ratio 3:2
When mixing, time constant is minimum when temperature sensor, this is because under the ratio, the first particle magnesia powder and the second particle
The closest, the gap minimum between particle of magnesia powder accumulation.
The Applicant declares that the present invention is explained by the above embodiments detailed process equipment and process flow of the invention,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (6)
1. a kind of heat filling for temperature sensor, which is characterized in that the heat filling includes the first particle magnesia
Powder and the second particle magnesia powder；
The mass ratio of the first particle magnesia powder and the second particle magnesia powder is 2~4:2；
The first particle magnesia powder is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the first particle magnesia powder；
The second particle magnesia is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the second particle magnesia powder.
2. heat filling according to claim 1, which is characterized in that the first particle magnesia powder and the second particle oxygen
The mass ratio for changing magnesium powder is 3:2.
3. heat filling according to claim 1 or 2, which is characterized in that the first particle magnesia powder is according to quality
The size distribution of percentages is as follows:
The sum of varigrained particle magnesia powder is 100% in the first particle magnesia powder.
4. heat filling described in any one of claim 1 to 3, which is characterized in that the second particle magnesia is pressed
It is as follows according to the size distribution of mass percent meter:
The sum of varigrained particle magnesia powder is 100% in the second particle magnesia powder.
5. a kind of temperature sensor, which is characterized in that the temperature sensor includes shell, the temperature for being arranged in the enclosure interior
According to any one of claims 1 to 4 between the temperature detecting element is led inside housings for degree detecting element and filling
Hot filler.
6. a kind of purposes of temperature sensor according to claim 4 or 5, which is characterized in that the temperature sensor is used
In air appliance, industrial temperature measurement or aircraft environmental control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811340204.4A CN109456737A (en) | 2018-11-12 | 2018-11-12 | A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811340204.4A CN109456737A (en) | 2018-11-12 | 2018-11-12 | A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes |
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Application publication date: 20190312 |