阅读说明：本技术 薄壁圆筒轴向热导率测量装置 (Axial thermal conductivity measuring device for thin-wall cylinder ) 是由 王丙柱 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种薄壁圆筒轴向热导率测量装置,包括设置于两个待测薄壁圆筒端面之间的加热器,每个待测薄壁圆筒外壁上均粘贴至少一组测温元件组,两个待测薄壁圆筒和加热器组成的检测体内外分别间隔设置内反射筒和外反射筒；检测体、内反射筒和外反射筒两端分别与两个支板连接后组成的整体置于密封腔体内,密封腔体置于恒温系统中,密封腔体的顶部设置电极,电极通过内连接线束分别连接测温元件组和加热器,通过外连接线束分别连接温度巡检显示仪表和高精度功率测量仪表,高精度功率测量仪表连接恒定加热功率控制仪器。本发明解决了现有测量装置中存在的问题,达到薄壁圆筒轴向热导率优于|5％|的测量精度。(The invention discloses a device for measuring the axial thermal conductivity of thin-wall cylinders, which comprises a heater arranged between the end surfaces of two thin-wall cylinders to be measured, wherein at least one group of temperature measuring element groups are adhered to the outer wall of each thin-wall cylinder to be measured, and an internal reflecting cylinder and an external reflecting cylinder are respectively arranged inside and outside a detection body formed by the two thin-wall cylinders to be measured and the heater at intervals; the detection body, the inner reflecting cylinder and the outer reflecting cylinder are connected with two support plates at two ends respectively to form a whole body, the whole body is arranged in a sealed cavity, the sealed cavity is arranged in a constant temperature system, the top of the sealed cavity is provided with an electrode, the electrode is connected with a temperature measuring element group and a heater through an inner connecting wire harness respectively, a temperature patrol detecting display instrument and a high-precision power measuring instrument are connected through an outer connecting wire harness respectively, and the high-precision power measuring instrument is connected with a constant heating power control instrument. The invention solves the problems existing in the existing measuring device and achieves the measuring precision that the axial thermal conductivity of the thin-wall cylinder is superior to | 5% |.)

1. The utility model provides an axial thermal conductivity measuring device of thin wall drum, is including setting up heater (2) between two thin wall drums (1) terminal surfaces that await measuring, all pastes at least a set of temperature element group, its characterized in that on every thin wall drum (1) outer wall that awaits measuring: an inner reflecting cylinder (18) and an outer reflecting cylinder (17) are respectively arranged inside and outside a detection body consisting of the two thin-wall cylinders (1) to be detected and the heater (2) at intervals; the detection body, the inner reflection barrel (18) and the outer reflection barrel (17) are connected with the two support plates (3) respectively at two ends to form a whole, the whole is arranged in the sealed cavity (5), the sealed cavity (5) is arranged in a constant temperature system, the top of the sealed cavity (5) is provided with an electrode (6), the electrode (6) is respectively connected with the temperature measuring element group and the heater (2) through an inner connecting wire harness (19), the outer connecting wire harness (20) is respectively connected with the temperature patrol display instrument (21) and the high-precision power measuring instrument (22), and the high-precision power measuring instrument (22) is connected with the constant heating power control instrument (23).

2. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: the constant temperature system comprises a constant temperature bath (12) filled with refrigerant liquid (11) inside and a refrigerator (13) communicated with the constant temperature bath (12) through a circulating pump (10).

3. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: and the top of the sealed cavity (5) is provided with an air suction port (7) and a vacuum degree measuring port (8).

4. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: the sealing cavity (5) is arranged in the constant temperature system through the fixing frame (4).

5. The thin-walled cylindrical axial thermal conductivity measurement device of claim 1 or 3, wherein: the bottom (9) of the sealed cavity (5) is immersed in the refrigerant liquid (11).

6. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: the longitudinal section of the support plate (3) is L-shaped, and three coaxial annular grooves (15) are formed in the side wall of the vertical plate.

7. The thin-walled cylinder axial thermal conductivity measurement device of claim 6, wherein: the annular groove (15) is arranged on one side of the vertical plate of the support plate (3) back to the transverse plate.

8. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: the ends of the detection body, the internal reflection cylinder (18) and the external reflection cylinder (17) are respectively inserted into the three annular grooves (15).

9. The thin-walled cylinder axial thermal conductivity measurement device of claim 1, wherein: the temperature measuring element group comprises a plurality of temperature measuring elements (16), and the plurality of temperature measuring elements (16) are uniformly distributed along a circular ring parallel to the end face of the thin-wall cylinder (1) to be measured.

10. The thin-walled cylinder axial thermal conductivity measurement device of claim 6, wherein: the transverse plate of the support plate (3) is in contact with the inner side surface of the cavity bottom (9) of the sealed cavity (5).

Technical Field

The invention belongs to the field of material heat conduction performance testing, and particularly relates to a device for measuring axial heat conductivity of a thin-wall cylinder.

Background

Thermal conductivity (also called thermal conductivity) is a thermophysical parameter for characterizing the thermal conductivity of a material, and test measurement is often adopted in engineering to obtain material thermal conductivity data.

Chinese patent publication CN 103713013 a (application publication No. 2014.04.09) discloses a device for testing axial thermal conductivity of a tubular material, as shown in fig. 1, the device includes an annular heater 100 disposed between two end surfaces of a tubular material 900 to be tested, which have the same material and the same external dimension, and a heat dissipation ring 200 is disposed at one end of the tubular material 900 to be tested, which is far away from the annular heater 100; the annular heater 100 is an annular sheet, and the inner diameter and the outer diameter of the annular heater 100 are the same as those of the tubular material 900 to be detected; at least three temperature measuring elements 300 are adhered to the outer walls of the two ends of the tubular material 900 to be measured, and the temperature measuring elements 300 at each end are uniformly distributed along a circular ring parallel to the end face of the tubular material 900 to be measured; the temperature measuring element 300 is connected with the temperature display instrument 400 through a lead. The invention solves the problem of measuring the axial thermal conductivity coefficient of the tubular material, is suitable for measuring the axial thermal conductivity of the thin-wall cylinder, but has the following problems in the measurement of the axial thermal conductivity of the thin-wall cylinder by using the device of the invention:

1. two tubular materials to be measured 900, the central annular heater 100 and the end heat dissipation ring 200 in the device are influenced by the temperature of the environment to be measured and the air flow, so that the measurement is unstable;

2. the end surface temperature stability of the tubular material 900 to be tested connected with the heat dissipation ring 200 is influenced by different testing temperatures of the tubular material to be tested;

3. the lateral surfaces of the two tubular materials 900 to be measured and the annular heater 100 have heat transfer loss to the surrounding environment, and the larger the lateral areas of the tubular materials to be measured and the heater are, the larger the heat loss is, and the larger the measurement error is caused.

Disclosure of Invention

The invention is provided for overcoming the defects in the prior art, and aims to provide a measuring device for the axial thermal conductivity of a thin-wall cylinder.

The invention is realized by the following technical scheme:

the device for measuring the axial thermal conductivity of the thin-wall cylinder comprises a heater arranged between the end faces of two thin-wall cylinders to be measured, wherein at least one group of temperature measuring element groups are adhered to the outer wall of each thin-wall cylinder to be measured, and an internal reflecting cylinder and an external reflecting cylinder are respectively arranged inside and outside a detection body formed by the two thin-wall cylinders to be measured and the heater at intervals; the detection body, the inner reflecting cylinder and the outer reflecting cylinder are connected with two support plates at two ends respectively to form a whole body, the whole body is arranged in a sealed cavity, the sealed cavity is arranged in a constant temperature system, the top of the sealed cavity is provided with an electrode, the electrode is connected with a temperature measuring element group and a heater through an inner connecting wire harness respectively, a temperature patrol detecting display instrument and a high-precision power measuring instrument are connected through an outer connecting wire harness respectively, and the high-precision power measuring instrument is connected with a constant heating power control instrument.

In the technical scheme, the constant temperature system comprises a constant temperature bath tank filled with refrigerant liquid inside and a refrigerator communicated with the constant temperature bath tank through a circulating pump.

In the technical scheme, the top of the sealed cavity is provided with an extraction opening and a vacuum degree measurement opening.

In the above technical scheme, the seal chamber is arranged in the constant temperature system through the fixing frame.

In the above technical solution, the bottom of the sealed cavity is immersed in the coolant liquid.

In the technical scheme, the longitudinal section of the support plate is L-shaped, and three coaxial annular grooves are formed in the side wall of the vertical plate.

In the technical scheme, the annular groove is formed in one side, back to the transverse plate, of the vertical plate of the support plate.

In the above technical solution, the ends of the detection body, the internal reflection cylinder and the external reflection cylinder are respectively inserted into the three annular grooves.

In the technical scheme, the temperature measuring element group comprises a plurality of temperature measuring elements which are uniformly distributed along a circular ring parallel to the end face of the thin-wall cylinder to be measured.

In the technical scheme, the transverse plate of the support plate is in contact with the inner side face of the cavity bottom of the sealed cavity.

The invention has the beneficial effects that:

the invention provides a device for measuring the axial thermal conductivity of a thin-wall cylinder, which solves the problems that the measurement stability of the axial thermal conductivity of the thin-wall cylinder is influenced by the temperature and airflow of a measurement environment, the temperature stability of the end face of the thin-wall cylinder connected with a heat dissipation plate is influenced by different test temperatures of the thin-wall cylinder, and the measurement precision is influenced by heat transfer loss between the side faces of the thin-wall cylinder to be measured and a heater and the environment, and achieves the measurement precision that the axial thermal conductivity of the thin-wall cylinder is superior to | 5.

Drawings

FIG. 1 is a schematic structural diagram of a prior art apparatus for testing axial thermal conductivity of a tubular material;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the present invention in a measuring state;

FIG. 4 is a front view of an annular planar thin film heater of the present invention;

FIG. 5 is a side view of an annular flat film heater of the present invention.

Wherein:

1 thin-wall cylinder 2 heater to be measured

3 support plate 4 mount

5 sealed cavity 6 electrode

7 pumping hole and 8 vacuum degree measuring hole

9 cavity bottom 10 circulating pump

11 refrigerant liquid 12 constant temperature bath

13 refrigerator 14 binding post

15 annular groove 16 temperature measuring element

17 external reflection tube 18 internal reflection tube

19 internal connection harness 20 external connection harness

21 temperature patrol inspection display instrument 22 high-precision power measuring instrument

23 constant heating power control instrument

100 ring heater 200 heat dissipation ring

300 temperature measuring element 400 temperature display instrument

500 heating controller 600 ammeter

700 voltmeter 800 external power supply

900 tubular material to be tested

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention for measuring axial thermal conductivity of a thin-walled cylinder are further described below by referring to the drawings of the specification and the specific embodiments.