Metal high-temperature heat conductivity coefficient tester

Abstract

The utility model discloses a metal high-temperature heat conductivity coefficient tester, which comprises an instrument desk, a lifting module mounted on the instrument desk, an electric furnace fixed at a movable end of the lifting module through a supporting plate, a downward hearth inlet of the electric furnace, a quartz sealing cover arranged on the inner wall of the hearth of the electric furnace, and a cooling water jacket arranged at the hearth inlet, a vacuum cylinder is fixedly mounted on an instrument desk below an electric furnace, a power supply positive pole connecting rod is vertically and fixedly mounted on the vacuum cylinder through an insulating seat, a test sample is fixedly mounted on the power supply positive pole connecting rod, and six thermocouples are fixedly mounted around the power supply positive pole connecting rod through insulating thermocouple fixing seats. A power supply cathode pull rod is vertically arranged on the vacuum cylinder through an insulating sleeve; and the upper end of the power supply cathode pull rod is fixedly connected with a power supply cathode pressing plate contacted with the top end of the test sample. The device can be used for measuring the heat conductivity coefficients of metal samples at different temperatures, is high in integration level, small in size and convenient to operate, and can be used for testing sample materials which are easy to oxidize in the air.

Description

Technical Field

[0001] The utility model relates to the technical field of physical experiment instruments, in particular to a metal high-temperature thermal conductivity tester. Background Art

[0002] The thermal conductivity, also known as the heat conductivity, is an inherent performance parameter of the material itself, used to describe the heat conduction ability of the material. It has nothing to do with the size, shape, and thickness of the material itself, but only with the composition of the material itself. The thermal conductivities of different compositions vary greatly, resulting in large differences in the thermal conductivities of materials composed of different compositions. The thermal conductivity of a material is an important parameter index for studying the physical properties of the material. In industrial sectors such as aviation, atomic energy, building materials, metals, and non-metallic materials, it is required to predict or actually measure the thermal conductivity of relevant materials. Currently, the existing thermal conductivity test devices generally have low integration and large equipment volume. In addition, it is not convenient to measure the thermal conductivity of non-phase-change metal materials at high temperatures. Summary of the Invention

[0003] Aiming at the problems existing in the above-mentioned prior art, the utility model provides a metal high-temperature thermal conductivity tester with high integration, small volume, and convenient operation.

[0004] The technical solution adopted by the utility model is as follows: A metal high-temperature thermal conductivity tester includes an instrument table, on which a lifting module is installed. The moving end of the lifting module is fixedly installed with an electric furnace through a support plate. The furnace inlet of the electric furnace faces downward. A quartz sealing cover is arranged on the inner wall of the electric furnace furnace. A cooling water jacket is arranged at the furnace inlet of the electric furnace. A vacuum cylinder is fixedly installed on the instrument table below the electric furnace. A vacuum pumping nozzle is connected to the vacuum cylinder. A power supply positive electrode connecting rod is vertically fixedly installed on the vacuum cylinder through an insulating seat. The test sample is fixedly installed on the power supply positive electrode connecting rod. Six thermocouples are fixedly installed around the power supply positive electrode connecting rod through an insulating thermocouple fixing seat. Among them, three thermocouples are respectively used to measure the temperatures at the midpoint and both ends of the test sample, and the other three thermocouples are used to measure the ambient temperatures around the three temperature measurement points of the test sample. A power supply negative electrode pull rod is vertically installed on the vacuum cylinder through an insulating sleeve. A power supply negative electrode pressing plate in contact with the top end of the test sample is fixedly connected to the upper end of the power supply negative electrode pull rod. The lifting module drives the electric furnace to descend so that the power supply positive electrode connecting rod, the test sample, the thermocouples, the power supply negative electrode pull rod, and the power supply negative electrode pressing plate are located in the electric furnace furnace, and the cooling water jacket is in sealed connection with the sealing ring arranged on the vacuum cylinder.

[0005] Further, a central hole is provided in the middle of the insulating thermocouple fixing seat. The positive power connecting rod passes through the central hole. Six small holes are evenly distributed on the circumference of the insulating thermocouple fixing seat with the central hole as the center. The thermocouple wire is placed in the corundum thermocouple sleeve, and the corundum thermocouple sleeves respectively pass through the corresponding small holes.

[0006] Further, a limit ring is provided at the bottom of the negative power pull rod, and a spring is sleeved between the limit ring and the insulating sleeve on the negative power pull rod.

[0007] Further, a plurality of wire passing holes for power lines and signal lines to pass through are provided on the bottom plate of the vacuum cylinder, and a sealing structure is provided at the wire passing holes.

[0008] Further, an instrument panel is provided on the instrument table, and control buttons and a parameter display module are provided on the instrument panel.

[0009] The metal high-temperature thermal conductivity tester of the present invention can measure the thermal conductivity of metal samples at different temperatures. The whole device has a high integration degree, reduces the volume of the instrument and equipment, and is more convenient to operate; the device can evacuate the test environment and can test sample materials that are easily oxidized in the air; the tester is based on the principle of longitudinal heat flow method and is applicable to measuring the thermal conductivity of metals without phase change within the temperature range of 80° to 1000°C, meeting the high-precision test requirements of material testing and research departments for the thermal conductivity of materials. Description of the Drawings

[0010] Figure 1 is the overall structural schematic diagram of the present invention.

[0011] Figure 2 is the partial structural schematic diagram of the vacuum cylinder of the present invention and the components installed on the vacuum cylinder.

[0012] Figure 3 is the top view schematic diagram of the insulating thermocouple fixing seat of the present invention. Detailed Embodiments

[0013] For ease of understanding of the present invention, the following will describe the present invention more comprehensively and meticulously in conjunction with the accompanying drawings of the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0014] Such as Figures 1 - 3As shown in the figure, the high-temperature thermal conductivity tester for metals in this embodiment includes an instrument console 1. An elevating module 12 is installed on the instrument console 1. The moving end of the elevating module 12 is fixedly installed with an electric furnace 10 through a support plate 14. The furnace inlet of the electric furnace 10 faces downward. A quartz sealing cover 11 is arranged on the inner wall of the furnace of the electric furnace 10. A cooling water jacket 9 is arranged at the furnace inlet of the electric furnace 10. A vacuum cylinder 3 is fixedly installed on the instrument console 1 below the electric furnace 10. A vacuum pumping nozzle 19 is connected to the vacuum cylinder 3. A positive power supply connecting rod 6 is vertically fixedly installed on the vacuum cylinder 3 through an insulating seat. A test specimen 8 is fixedly installed on the positive power supply connecting rod 6. Six thermocouples 7 are fixedly installed around the positive power supply connecting rod 6 through insulating thermocouple fixing seats 5. Among them, three thermocouples 7 respectively measure the temperatures at the midpoint and both ends of the test specimen 8, and the other three thermocouples 7 are used to measure the ambient temperatures around the three temperature measurement points of the test specimen 8. A negative power supply pull rod 15 is vertically installed on the vacuum cylinder 3 through an insulating sleeve 17. A negative power supply pressing plate 13 in contact with the top end of the test specimen 8 is fixedly connected to the upper end of the negative power supply pull rod 15. The elevating module 12 drives the electric furnace 10 to descend so that the positive power supply connecting rod 6, the test specimen 8, the thermocouples 7, the negative power supply pull rod 15, and the negative power supply pressing plate 13 are in the furnace of the electric furnace 10, and the cooling water jacket 9 contacts the sealing ring 16 arranged on the vacuum cylinder 3 to form a sealed connection.

[0015] During operation, first fixedly install the test specimen 8 on the positive power supply connecting rod 6, then place the negative power supply pressing plate 13 at the top end of the test specimen 8 and stably contact the top end of the specimen 8. Then drive the electric furnace 10 to descend through the elevating module 12 so that the cooling water jacket 9 presses tightly on the sealing ring 16 located on the vacuum cylinder 3. Vacuum is pumped through the vacuum pumping nozzle 19 to create a vacuum environment in the vacuum cylinder 3 and the furnace of the electric furnace 10. After starting the electric furnace 10 and heating it to the set temperature, the positive and negative poles are connected to conduct current. The current and voltage flowing through the test specimen 8 are obtained through the test instrument arranged in the instrument console, and the temperatures at the middle and both ends of the test specimen 8, as well as the ambient temperatures at the corresponding positions, are respectively measured through the thermocouples 7. After collecting the above data, the thermal conductivity of the test specimen is obtained through the processing module arranged in the instrument console based on the calculation method of the energized longitudinal heat flow method.

[0016] To avoid the influence of high temperature on the sealing structure, cooling water is introduced into the cooling water jacket 9 to cool down the sealing structure.

[0017] To facilitate the fixing of the thermocouples, a central hole is arranged in the middle of the insulating thermocouple fixing seat 5 in this embodiment. The positive power supply connecting rod 6 passes through the central hole. Six small holes are evenly distributed on the circumference of the insulating thermocouple fixing seat 5 with the central hole as the center. The thermocouple wires are placed in corundum thermocouple sleeves, and the corundum thermocouple sleeves respectively pass through the corresponding small holes.

[0018] To enable the negative power supply pressure plate 13 to stably contact the test specimen 8, a limit ring is provided at the bottom of the negative power supply pull rod 15. A spring 18 is sleeved between the limit ring and the insulating sleeve 17 on the negative power supply pull rod 15. The spring 18 can apply a downward pressure to the negative power supply pull rod 15 and the negative power supply pressure plate 13.

[0019] Multiple wire passing holes for power lines and signal lines to pass through are provided on the bottom plate of the vacuum cylinder 3, and a sealing structure is provided at the wire passing holes.

[0020] An instrument panel 2 is provided on the instrument console 1. Control buttons and a parameter display module are provided on the instrument panel 2. The displayed parameters include the electric furnace temperature, the voltage and current in the specimen working area, as well as the temperatures at the upper, middle, and lower ends of the specimen and the corresponding ambient temperatures at the upper, middle, and lower ends.

[0021] With the help of the teachings present in the foregoing specification and the associated drawings, those skilled in the art to which the present invention pertains will envision many modifications and other embodiments of the present invention. Accordingly, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and that modifications and other embodiments are regarded as included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A metal high temperature thermal conductivity tester, comprising an instrument platform (1), characterized in that: The instrument panel (1) is provided with a lifting module (12), the movable end of the lifting module (12) is fixedly provided with an electric furnace (10) via a support plate (14), the furnace inlet of the electric furnace (10) faces downward, a quartz sealing cover (11) is provided on the inner wall of the furnace of the electric furnace (10), a cooling water jacket (9) is provided at the furnace inlet of the electric furnace (10), a vacuum cylinder (3) is fixedly provided on the instrument panel (1) below the electric furnace (10), a vacuum nozzle (19) is connected to the vacuum cylinder (3), a positive power connection rod (6) is vertically fixedly provided on the vacuum cylinder (3) via an insulating seat, a test sample (8) is fixedly provided on the positive power connection rod (6), and six thermocouples are fixedly provided around the positive power connection rod (6) via an insulating thermocouple fixing seat (5). Thermocouples (7) are used to measure the temperature at the midpoint and two ends of the test sample (8) respectively, and the other three thermocouples (7) are used to measure the ambient temperature around the three temperature measurement points of the test sample (8). A negative power pull rod (15) is vertically installed on the vacuum cylinder (3) through an insulating sleeve (17), and a negative power pressure plate (13) in contact with the top of the test sample (8) is fixedly connected to the upper end of the negative power pull rod (15). The lifting module (12) drives the electric furnace (10) to descend so that the positive power connection rod (6), the test sample (8), the thermocouple (7), the negative power pull rod (15), and the negative power pressure plate (13) are in the furnace of the electric furnace (10), and the cooling water jacket (9) contacts the sealing ring (16) arranged on the vacuum cylinder (3) to form a sealed connection.

2. A metal high temperature thermal conductivity tester as claimed in claim 1, characterized in that: A central hole is provided in the middle of the insulating thermocouple fixing seat (5), and the positive power supply connecting rod (6) passes through the central hole. Six small holes are evenly distributed on the circumference of the insulating thermocouple fixing seat (5) with the central hole as the center. The thermocouple wire is placed in a corundum thermocouple sleeve, and the corundum thermocouple sleeves pass through the corresponding small holes respectively.

3. A metal high temperature thermal conductivity tester as claimed in claim 1, characterized in that: A limit ring is provided at the bottom of the negative electrode pull rod (15) of the power source, and a spring (18) is sleeved between the limit ring of the negative electrode pull rod (15) of the power source and the insulating sleeve (17).

4. A metal high temperature thermal conductivity tester as claimed in claim 1, characterized in that: A plurality of wire passage holes for power lines and signal lines to pass through are provided on the bottom plate of the vacuum cylinder (3), and a sealing structure is provided at the wire passage holes.

5. A metal high temperature thermal conductivity tester as claimed in claim 1, characterized in that: A dashboard (2) is arranged on the instrument panel (1), and control buttons and a parameter display module are arranged on the dashboard (2).

Images