Uniform temperature field high-low temperature furnace body structure for thermal analysis test

Abstract

The invention belongs to the technical field of material thermophysical property precision measurement, and discloses a uniform temperature field high and low temperature furnace body structure for thermal analysis testing, which comprises a sample chamber (1) and a heat insulation sleeve (2) sleeved outside the sample chamber (1), the sample chamber (1) and the heat insulation sleeve (2) are both in a high vacuum environment, and a heating system and a refrigerating system are arranged on the sample chamber (1). A constant temperature system is arranged on the heat insulation sleeve (2). The multi-layer thermal insulation design integrating heating and refrigerating is adopted, the temperature field gradient of the temperature environment where the measured sample is located is reduced, the stability of the temperature field is improved, temperature change is measured, and accurate temperature field control under high-precision continuous measurement is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of precise measurement of the thermophysical properties of materials, and relates to a furnace body structure for thermal analysis testing, in particular to a high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing. Background Art

[0002] With the rapid development of materials science and the rapid progress of thermal analysis technology itself, thermal analysis instruments have been increasingly widely used and have almost become conventional analysis instruments today. Thermal analysis experiments are usually carried out under dynamic conditions (such as constant rate heating and cooling), and the measured data are generally non-thermal equilibrium values, so they will be affected by many factors such as heating and cooling rates, atmosphere, and sample state, which must be fully considered when designing thermal analysis experiments.

[0003] Generally, during the test, problems such as too large a temperature gradient in the temperature field where the sample to be measured is located and poor temperature field stability will occur due to temperature changes, which are not conducive to improving the test accuracy and affect the analysis of the performance of subsequent samples. How to reduce the temperature field gradient of the temperature environment where the sample to be measured is located, improve the stability of its temperature field, and achieve precise temperature field control under high-precision continuous measurement of temperature changes has become an urgent technical problem to be solved. Summary of the Invention

[0004] (I) Object of the Invention

[0005] The object of the present invention is to provide a high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing to solve the problems of too large a temperature field gradient, poor temperature field stability, and low measurement accuracy in the environment where the sample to be measured is located during the test.

[0006] (II) Technical Solution

[0007] To solve the above technical problems, the present invention provides a high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing, which includes: a sample chamber 1 and a heat insulation sleeve 2 sleeved outside it. Both the sample chamber 1 and the heat insulation sleeve 2 are in a high vacuum environment. A heating system and a refrigeration system are provided on the sample chamber 1, and a constant temperature system is provided on the heat insulation sleeve 2.

[0008] Further, the heating system includes an electric heating wire 4 wound in a groove on the outer wall of the sample chamber 1 for heating control of the sample chamber 1.

[0009] Further, the refrigeration system includes a refrigerant pipeline arranged in the wall of the sample chamber 1 for refrigeration control of the sample chamber 1, and the refrigerant interface of the refrigerant pipeline is arranged outside the heat insulation sleeve 2.

[0010] Further, the constant temperature system includes a constant temperature water circulation pipeline arranged in the wall of the heat insulation sleeve 2, and the circulation water interface of the constant temperature water circulation pipeline is opened at the top of the heat insulation sleeve 2.

[0011] Further, a thermistor mounting hole is provided at the bottom of the sample chamber 1 for mounting a thermocouple or a thermistor to form a heating control feedback loop to control the temperature inside the sample chamber 1.

[0012] Further, a thermocouple wire passing hole communicating with the inside is provided on the side wall of the sample chamber 1 for mounting a thermocouple or a thermistor to detect the sample temperature in real time and control and monitor the temperature inside the chamber.

[0013] Further, a sample chamber spacer 5 is provided outside the heating wire 4, and a heat insulation sleeve spacer 6 is provided on the outer side wall of the heat insulation sleeve 2. The sample chamber spacer 5 and the heat insulation sleeve spacer 6 are double-sided polished to serve as high reflectivity bodies.

[0014] Further, a base is provided at the bottom opening of the heat insulation sleeve 2, and a plurality of sample support screws 3 are provided on the inner wall of the base. The bottom of the sample chamber 1 is supported and placed on the sample support screws 3.

[0015] Further, the top end of the sample support screw 3 is designed to be conical and in point contact with the sample chamber 1.

[0016] Further, the sample chamber 1 and the heat insulation sleeve 2 are made of copper, a metal nickel or chromium reflective film is plated on the inner surface of the heat insulation sleeve 2, and the sample chamber spacer 5 and the heat insulation sleeve spacer 6 are both made of double-sided polished stainless steel.

[0017] (III) Beneficial Effects

[0018] The uniform temperature field high and low temperature furnace body structure for thermal analysis testing provided by the above technical solution adopts a multi-layer heat insulation design with integrated heating and cooling, reduces the temperature field gradient of the temperature environment where the sample to be measured is located, improves the stability of the temperature field where it is located, and realizes precise temperature field control under high-precision continuous measurement of the measured temperature change. Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional view of the uniform temperature field high and low temperature furnace body structure for thermal analysis testing in an embodiment of the present invention.

[0020] In the figure: 1. Sample chamber, 2. Heat insulation sleeve, 3. Sample chamber support screw, 4. Heating wire, 5. Sample chamber spacer, 6. Heat insulation sleeve spacer, 7. Refrigerant interface, 8. Circulating water interface, 9. Thermocouple wire passing hole, 10. Thermistor mounting hole, 11. Base wire passing hole, 12. Base. Detailed Embodiments

[0021] To make the objectives, contents and advantages of the present invention clearer, the following further describes in detail the specific embodiments of the present invention with reference to the drawings and embodiments.

[0022] Refer toFigure 1 As shown in the figure, the high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing in this embodiment includes a sample chamber 1 and a heat insulation sleeve 2 sleeved outside it. Both the sample chamber 1 and the heat insulation sleeve 2 are in a high vacuum environment. A heating system and a refrigeration system are provided on the sample chamber 1, and a constant temperature system is provided on the heat insulation sleeve 2.

[0023] Among them, the heating system includes an electric heating wire 4 wound in a groove on the outer wall of the sample chamber 1 for heating control of the sample chamber 1. The refrigeration system includes a refrigerant pipeline arranged inside the wall of the sample chamber 1 for refrigeration control of the sample chamber 1. The refrigerant interface 7 of the refrigerant pipeline is arranged outside the heat insulation sleeve 2. The power output of the electric heating wire 4 is controlled by an external automatic temperature controller to control the temperature inside the sample chamber 1, and the refrigeration is controlled by controlling the refrigerant flow rate in the refrigerant pipeline inside the sample chamber 1. The heating and refrigeration are controlled by means of thermal radiation to reduce the heat conduction between components.

[0024] The constant temperature system includes a constant temperature water circulation pipeline arranged inside the wall of the heat insulation sleeve 2. The circulating water interface 8 of the constant temperature water circulation pipeline is opened at the top of the heat insulation sleeve 2 to improve the temperature stability inside the sample chamber 1 and isolate the influence of internal temperature changes on external equipment.

[0025] A thermistor installation hole 10 is opened at the bottom of the sample chamber 1 for installing a thermocouple or a thermistor to form a heating control feedback loop for precise control of the temperature inside the sample chamber 1.

[0026] A thermocouple wire passing hole 9 communicating with the inside is opened on the side wall of the sample chamber 1 for installing a thermocouple or a thermistor to detect the sample temperature in real time. Other types of temperature sensors can also be used to control or monitor the temperature inside the furnace.

[0027] Since the sample chamber 1 and the heat insulation sleeve 2 are in a high vacuum environment and the heating and refrigeration are mainly controlled by thermal radiation, a sample chamber spacer 5 is arranged outside the electric heating wire 4, and a heat insulation sleeve spacer 6 is arranged on the outer side wall of the heat insulation sleeve 2. During the control process, the double-sided polished sample chamber spacer 5 and heat insulation sleeve spacer 6 can be used as high reflectivity bodies to reduce the heat dissipation of the sample chamber 1 and ensure the temperature field stability inside the sample chamber 1.

[0028] A base 12 is arranged at the bottom opening of the heat insulation sleeve 2, and a plurality of sample support screws 3 are arranged on the inner wall of the base 12. The bottom of the sample chamber 1 is supported and placed on the sample support screws 3.

[0029] The top of the sample support screw 3 is designed to be conical to achieve point contact with the sample chamber 1. Moreover, there is a high vacuum environment between the heat insulation sleeve 2 and the sample chamber 1 without filling any heat insulation materials, so that the heat conduction between the sample furnace 1 and the heat insulation sleeve 2 is minimized.

[0030] The sample chamber 1 and the heat insulation sleeve 2 are made of copper, and there are stainless steel gaskets on their outer surfaces. The inner surface of the heat insulation sleeve 2 is plated with a metal nickel or chromium reflective film to reduce heat dissipation.

[0031] The sample chamber gasket 5 and the heat insulation sleeve gasket 6 are both made of double-sided polished stainless steel.

[0032] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing, characterized in that, Comprising: A sample chamber (1) and a heat insulation sleeve (2) sleeved outside thereof. Both the sample chamber (1) and the heat insulation sleeve (2) are in a high vacuum environment. A heating system and a refrigeration system are provided on the sample chamber (1), and a constant temperature system is provided on the heat insulation sleeve (2).

2. The uniform temperature field high and low temperature furnace body structure for thermal analysis testing according to claim 1, characterized in that, The heating system includes a heating wire (4) wound in a groove on the outer wall of the sample chamber (1) for heating control of the sample chamber (1).

3. The high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing according to claim 2, characterized in that, The refrigeration system includes a refrigerant pipeline provided in the wall of the sample chamber (1) for refrigeration control of the sample chamber (1). The refrigerant interface of the refrigerant pipeline is provided outside the heat insulation sleeve (2).

4. The high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing according to claim 3, characterized in that, The constant temperature system includes a constant temperature water circulation pipeline provided in the wall of the heat insulation sleeve (2). The circulation water interface of the constant temperature water circulation pipeline is opened at the top of the heat insulation sleeve (2).

5. The high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing according to claim 4, wherein A thermistor mounting hole is opened at the bottom of the sample chamber (1) for mounting a thermocouple or a thermistor to form a heating control feedback loop to control the temperature inside the sample chamber (1).

6. The high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing as described in claim 5, characterized in that, A thermocouple wire passing hole communicating with the inside is opened on the side wall of the sample chamber (1) for mounting a thermocouple or a thermistor to detect the sample temperature in real time and control and monitor the indoor temperature.

7. The uniform temperature field high and low temperature furnace body structure for thermal analysis testing according to claim 6, characterized in that, A sample chamber spacer (5) is provided outside the heating wire (4). A heat insulation sleeve spacer (6) is provided on the outer side wall of the heat insulation sleeve (2). The sample chamber spacer (5) and the heat insulation sleeve spacer (6) are double-sided polished as high reflectivity bodies.

8. The uniform temperature field high and low temperature furnace body structure for thermal analysis testing according to claim 7, characterized in that, A base is provided at the bottom opening of the heat insulation sleeve (2). A plurality of sample support screws (3) are provided on the inner wall of the base. The bottom of the sample chamber (1) is supported and placed on the sample support screws (3).

9. The high and low temperature furnace body structure with a uniform temperature field for thermal analysis testing according to claim 8, characterized in that, The top end of the sample support screw (3) is designed to be conical and in point contact with the sample chamber (1).

10. The uniform temperature field high and low temperature furnace body structure for thermal analysis testing according to claim 9, characterized in that, The materials of the sample chamber (1) and the heat insulation sleeve (2) are copper. A metal nickel or chromium reflective film is plated on the inner surface of the heat insulation sleeve (2). The sample chamber spacer (5) and the heat insulation sleeve spacer (6) are both made of double-sided polished stainless steel.

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