CN113677049B - Heating unit of heat conductivity coefficient tester - Google Patents
Heating unit of heat conductivity coefficient tester Download PDFInfo
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- CN113677049B CN113677049B CN202110952124.XA CN202110952124A CN113677049B CN 113677049 B CN113677049 B CN 113677049B CN 202110952124 A CN202110952124 A CN 202110952124A CN 113677049 B CN113677049 B CN 113677049B
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- heating unit
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides a heating unit of a heat conductivity coefficient tester, which comprises: the first bulge is arranged on the measuring plate and/or the protection plate, so that a first gap is formed between the measuring plate and the protection plate, and the width of the first gap is increased from a direction away from the heating member to a direction close to the heating member. In the heating unit of the thermal conductivity tester provided by the invention, the width of the first gap is increased from the direction far away from the heating element to the direction close to the heating element, the heat transfer of the measuring plate to the protection plate can be reduced at the position with the increased width, the strength of the measuring plate can be met due to the arrangement of the first bulge, and the gap area ratio can meet the requirement.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a heating unit of a thermal conductivity tester.
Background
The thermal conductivity tester is used for measuring the thermal resistance and the thermal conductivity of the heat-insulating material, and the thermal conductivity is an important parameter for measuring the thermal conductivity and the heat preservation performance of the heat-resistant material. The accuracy of the thermal conductivity measurement is closely related to the heating unit of the measuring instrument.
In prior art, the heating unit of thermal conductivity apparatus includes metering plate and guard plate, and the guard plate sets up in the outside of metering plate along metering plate circumference, and the guard plate is used for preventing that the heat of metering plate scatters and disappears, generally can leave the clearance between metering plate and the guard plate for reduce the heat transfer between metering plate and the guard plate. In practical application, the thinner the metering plate, the larger the clearance, the smaller the heat transfer between metering plate and the guard plate, and the more accurate the test, however, the thinner the metering plate needs to set up great area, and the area is bigger but the thickness is little can't guarantee mechanical strength, takes place to warp easily. Further, the larger the gap, the greater the proportion of the area of the gap to the area of the metering plate, which can cause additional measurement errors. In the prior art, the design of the gap can not take account of the heat transfer between the metering plate and the protective plate, the mechanical strength of the metering plate and the occupation ratio of the gap area.
In summary, the conventional heating unit cannot take into account the heat transfer between the measuring plate and the protective plate, the mechanical strength of the measuring plate and the gap area ratio.
Disclosure of Invention
The invention aims to provide a heating unit of a thermal conductivity tester, which aims to solve the technical problems that the existing heating unit cannot give consideration to heat transfer between a metering plate and a protective plate, mechanical strength of the metering plate and the proportion of a gap area.
In order to solve the above technical problems, the present invention provides a heating unit of a thermal conductivity meter, comprising: the protection plate is arranged on the outer side of the metering plate along the circumferential direction of the metering plate, and the heating member is respectively attached to the metering plate and the protection plate; it is characterized in that the heating unit of the thermal conductivity tester further comprises: the first protrusion is arranged on the measuring plate and/or the protection plate, so that a first gap is formed between the measuring plate and the protection plate, and the width of the first gap is increased from the direction far away from the heating element to the direction close to the heating element.
In some embodiments of the present invention, the first protrusion extends in a direction close to the protection plate when the first protrusion is disposed on the metering plate, and the first protrusion extends in a direction close to the metering plate when the first protrusion is disposed on the protection plate.
In some embodiments of the invention, the first protrusion has a triangular, trapezoidal or rectangular shape.
In some embodiments of the present invention, the heating unit of the thermal conductivity measuring instrument further includes a second protrusion disposed on the measuring plate and/or the protection plate such that a second gap is formed between the measuring plate and the protection plate, and a width of the second gap increases and then decreases from a direction away from the heating member to a direction close to the heating member.
In some embodiments of the present invention, the second protrusion extends in a direction close to the protection plate when the second protrusion is disposed on the metering plate, and the second protrusion extends in a direction close to the metering plate when the second protrusion is disposed on the protection plate.
In some embodiments of the invention, the second protrusion has a triangular, trapezoidal or rectangular shape.
In some embodiments of the present invention, the heating unit of the thermal conductivity meter further comprises a cold plate, and a space is formed between the metering plate and the cold plate, wherein the space is used for placing a sample.
In some embodiments of the present invention, the number of the metering plates and the number of the protection plates are two, and the heating member is disposed between the two metering plates and the two protection plates.
In some embodiments of the invention, the number of the cold plates is two, and two spaces are formed between two cold plates and two metering plates respectively.
In some embodiments of the present invention, the heating member is a heating wire or a thin film heating sheet.
By adopting the technical scheme, the invention has the following beneficial effects:
in the heating unit of the thermal conductivity tester provided by the invention, the first bulge is arranged to form a first gap between the measuring plate and the protection plate, the width of the first gap is increased from the direction far away from the heating member to the direction close to the heating member, the heat transfer of the measuring plate to the protection plate can be reduced at the position with the increased width, the strength of the measuring plate can be met due to the arrangement of the first bulge, and the area ratio of the gap can also meet the requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a protection plate of a heating unit of a thermal conductivity meter according to an embodiment of the present invention, where the protection plate is provided with a first protrusion;
fig. 2 is a schematic structural diagram of a first protrusion disposed on both a protection plate and a metering plate of a heating unit of a thermal conductivity meter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heating unit of a thermal conductivity meter according to an embodiment of the present invention, in which a first protrusion is a trapezoid;
fig. 4 is a schematic structural diagram of a second gap in a heating unit of a thermal conductivity meter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a sample and a cold plate in a heating unit of a thermal conductivity meter according to an embodiment of the present invention;
fig. 6 is a schematic view of a triangular first protrusion in a heating unit of a thermal conductivity meter according to an embodiment of the present invention;
fig. 7 is another schematic view of a triangular first protrusion in a heating unit of a thermal conductivity meter according to an embodiment of the present invention;
FIG. 8 is a schematic view of a heating unit of a thermal conductivity meter according to an embodiment of the present invention, in which first protrusions are rectangular;
fig. 9 is another schematic view of a first protrusion in a heating unit of a thermal conductivity meter according to an embodiment of the present invention.
Reference numerals:
1-metering plate, 2-protective plate, 3-heating element, 4-first gap, 5-second gap, 6-sample, 7-cold plate,
11-first projections, 12-second projections.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be further explained with reference to specific embodiments.
As shown in fig. 1 to 5, the heating unit of the thermal conductivity meter provided in this embodiment of the present invention includes: the device comprises a metering plate 1, a protection plate 2 and a heating member 3, wherein the protection plate 2 is arranged on the outer side of the metering plate 1 along the circumferential direction of the metering plate 1, and the heating member 3 is respectively attached to the metering plate 1 and the protection plate 2; its characterized in that, the heating element of thermal conductivity apparatus still includes: the first protrusion 11 is arranged on the measuring plate 1 and/or the protection plate 2, so that a first gap 4 is formed between the measuring plate 1 and the protection plate 2, and the width of the first gap 4 is increased from a direction away from the heating member 3 to a direction close to the heating member 3.
Specifically, the first gap 4 is a relatively uniform gap, with a smaller width near the sample 6 and a larger width near the heating element 3, and the increased width can reduce the heat transfer from the metering plate 1 to the shielding plate 2.
Set up first arch 11 and can satisfy the intensity of metering plate 1, can guarantee the thickness of metering plate 1 and the size in clearance simultaneously, the area in clearance accounts for metering plate 1's area simultaneously less, can not arouse extra measuring error.
In some embodiments of the present invention, the first protrusion 11 extends in a direction close to the protection plate 2 when the first protrusion 11 is disposed on the measurement plate 1, and extends in a direction close to the measurement plate 1 when the first protrusion 11 is disposed on the protection plate 2.
As shown in fig. 2, specifically, when the first protrusion 11 is disposed on the metering plate 1, the first protrusion 11 extends to the right, and when the first protrusion 11 is disposed on the protection plate 2, the first protrusion 11 extends to the left.
As shown in fig. 6-9, in some embodiments of the invention, the first protrusions 11 are triangular, trapezoidal, or rectangular in shape.
As shown in fig. 2, the first protrusion 11 is rectangular, as shown in fig. 3, the first protrusion 11 is trapezoidal, as shown in fig. 6 and 7, the first protrusion 11 is triangular, as shown in fig. 8, the first protrusion 11 is rectangular, the rectangular first protrusion 11 is in arc transition connection with the protection plate, as shown in fig. 9, another shape of the first protrusion 11 is provided, as long as the first protrusion 11 extends toward the left, which all belong to the protection scope of the present application.
In some embodiments of the present invention, the heating unit of the thermal conductivity meter further includes a second protrusion 12, the second protrusion 12 is disposed on the measuring plate 1 and/or the shielding plate 2, such that a second gap 5 is formed between the measuring plate 1 and the shielding plate 2, and a width of the second gap 5 increases from a direction away from the heating member 3 to a direction close to the heating member 3 and then decreases.
Specifically, as shown in fig. 4, the width of the second gap 5 is smaller at the portion close to the sample 6, smaller at the portion close to the heating member 3, and larger at the middle portion, so that the strength of the measuring plate 1 can be better increased, and the area of the gap occupies smaller area of the measuring plate 1, and no additional measurement error is caused.
In some embodiments of the present invention, the second protrusion 12 extends in a direction close to the shielding plate 2 when the second protrusion 12 is disposed on the shielding plate 1, and extends in a direction close to the metering plate 1 when the second protrusion 12 is disposed on the shielding plate 2.
As shown in fig. 4, specifically, when the second protrusion 12 is disposed on the metering plate 1, the second protrusion extends to the right, and when the second protrusion 12 is disposed on the protection plate 2, the second protrusion 12 extends to the left.
In some embodiments of the invention, the second protrusions 12 are triangular, trapezoidal or rectangular in shape.
In some embodiments of the invention, the heating unit of the thermal conductivity meter further comprises a cold plate 7, and a space is formed between the metering plate 1 and the cold plate 7, and the space is used for placing the sample 6.
Specifically, the thermal conductivity of the sample 6 is measured by transferring heat from the metering plate 1 through the sample 6 to the cold plate 7.
In some embodiments of the present invention, the number of the metering plates 1 and the shielding plates 2 is two, and the heating member 3 is disposed between the two metering plates 1 and the two shielding plates 2.
In particular, two samples 6 may be provided, each sample 6 being connected to the metering plate 1.
In some embodiments of the invention, the number of cold plates 7 is two, two spaces being formed between two cold plates 7 and two metering plates 1, respectively.
Specifically, two spaces are used for placing two samples 6, respectively.
In some embodiments of the present invention, the heating member 3 is a heating wire or a thin film heating sheet.
When the heating unit of the thermal conductivity tester provided by the invention is used for measuring, the uneven first gap 4 or second gap 5 can effectively reduce the measurement error of the thermal conductivity caused by the heat transfer between the temperatures of the measuring plate 1 and the protection plate 2. Taking the measuring plate 1 with the diameter of 150mm, the thickness of 20mm and the size of sample 6 of 300 x 300 as an example, in the conventional structure, the height of the uniform gap is 1mm, and when the temperature difference between the measuring plate 1 and the protection plate 2 is 0.1 ℃, the heat transfer is about 0.02W, which causes the measurement error of the thermal conductivity coefficient to be about 2%. With a non-uniform first gap 4, the smaller height h1 is 1mm and the larger height h2 is 5mm, the heat transfer is 47% of 1mm uniform gap when the larger height to smaller height ratio is 1:1, 36% when the larger height to smaller height ratio is 2:1 and only 25% when 9: 1.
In summary, in the heating unit of the thermal conductivity meter provided by the present invention, the first protrusion 11 is disposed to form the first gap 4 between the measuring plate 1 and the protection plate 2, the width of the first gap 4 increases from the direction away from the heating member 3 to the direction close to the heating member 3, the increased width can reduce the heat transfer from the measuring plate 1 to the protection plate 2, and the first protrusion 11 can also satisfy the strength of the measuring plate 1, and the gap area ratio can also satisfy the requirement.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A heating unit of a thermal conductivity meter, comprising: the protection plate is arranged on the outer side of the metering plate along the circumferential direction of the metering plate, and the heating member is respectively attached to the metering plate and the protection plate; it is characterized in that the heating unit of the thermal conductivity tester further comprises:
the first protrusion is arranged on the measuring plate and/or the protection plate, so that a first gap is formed between the measuring plate and the protection plate, and the width of the first gap is increased from the direction far away from the heating element to the direction close to the heating element.
2. The heating unit of claim 1, wherein the first protrusion extends in a direction approaching the protection plate when the first protrusion is disposed on the measurement plate, and the first protrusion extends in a direction approaching the measurement plate when the first protrusion is disposed on the protection plate.
3. The heating unit of thermal conductivity meter according to claim 1, wherein the first protrusion has a triangular, trapezoidal or rectangular shape.
4. The heating unit of a thermal conductivity meter according to claim 1, wherein the heating unit further comprises a second protrusion disposed on the measuring plate and/or the protection plate, so that a second gap is formed between the measuring plate and the protection plate, and a width of the second gap increases first and then decreases from a direction away from the heating member to a direction close to the heating member.
5. The heating unit of claim 4, wherein the second protrusion extends in a direction approaching the protection plate when the second protrusion is disposed on the measurement plate, and the second protrusion extends in a direction approaching the measurement plate when the second protrusion is disposed on the protection plate.
6. The heating unit of thermal conductivity meter according to claim 4, wherein the second protrusion has a triangular, trapezoidal or rectangular shape.
7. The heating unit of claim 1, wherein the heating unit further comprises a cold plate, and a space is formed between the metering plate and the cold plate for placing a sample.
8. The heating unit of a thermal conductivity meter according to claim 7, wherein the number of the metering plates and the protective plates is two, and the heating member is disposed between the two metering plates and the two protective plates.
9. The heating unit of claim 8, wherein the number of the cold plates is two, and two spaces are formed between two cold plates and two metering plates, respectively.
10. The heating unit of the thermal conductivity meter according to claim 1, wherein the heating member is a heating wire or a thin film heating sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110952124.XA CN113677049B (en) | 2021-08-19 | 2021-08-19 | Heating unit of heat conductivity coefficient tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110952124.XA CN113677049B (en) | 2021-08-19 | 2021-08-19 | Heating unit of heat conductivity coefficient tester |
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| CN113677049A CN113677049A (en) | 2021-11-19 |
| CN113677049B true CN113677049B (en) | 2021-12-24 |
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| US5940784A (en) * | 1996-03-08 | 1999-08-17 | Metrisa, Inc. | Heat flow meter instruments |
| US7540656B1 (en) * | 2006-01-26 | 2009-06-02 | Sierra Lobo, Inc. | Apparatus for direct measurement of insulation thermal performance at cryogenic temperatures |
| CN101556256A (en) * | 2009-05-11 | 2009-10-14 | 天津科技大学 | Dual-flat plate thermal conductivity coefficient measuring instrument of thermal insulation materials |
| CN103675017A (en) * | 2012-09-12 | 2014-03-26 | 北京中建建筑科学研究院有限公司 | Testing device and method for thermal conductivity coefficient of material |
| CN105021650A (en) * | 2015-08-11 | 2015-11-04 | 中国兵器工业集团第五三研究所 | Device for measuring heat conduction coefficient by means of guarded hot plate method |
| CN111157569A (en) * | 2018-11-08 | 2020-05-15 | 哈尔滨工业大学 | Multi-parameter nondestructive rapid measurement method for high-temperature thermal conductivity, radiation property and multi-interface contact thermal resistance of semitransparent porous material |
-
2021
- 2021-08-19 CN CN202110952124.XA patent/CN113677049B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5940784A (en) * | 1996-03-08 | 1999-08-17 | Metrisa, Inc. | Heat flow meter instruments |
| US7540656B1 (en) * | 2006-01-26 | 2009-06-02 | Sierra Lobo, Inc. | Apparatus for direct measurement of insulation thermal performance at cryogenic temperatures |
| CN101556256A (en) * | 2009-05-11 | 2009-10-14 | 天津科技大学 | Dual-flat plate thermal conductivity coefficient measuring instrument of thermal insulation materials |
| CN103675017A (en) * | 2012-09-12 | 2014-03-26 | 北京中建建筑科学研究院有限公司 | Testing device and method for thermal conductivity coefficient of material |
| CN105021650A (en) * | 2015-08-11 | 2015-11-04 | 中国兵器工业集团第五三研究所 | Device for measuring heat conduction coefficient by means of guarded hot plate method |
| CN111157569A (en) * | 2018-11-08 | 2020-05-15 | 哈尔滨工业大学 | Multi-parameter nondestructive rapid measurement method for high-temperature thermal conductivity, radiation property and multi-interface contact thermal resistance of semitransparent porous material |
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| 平面热源法导热系数及热扩散率虚拟仿真实验开发;李辉等;《实验技术与管理》;20170520;第34卷(第05期);5-7 * |
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