CN213933667U

CN213933667U - High-precision heat-preservation module and experimental device for observing solidification behavior in situ

Info

Publication number: CN213933667U
Application number: CN202023091151.2U
Authority: CN
Inventors: 黄再旺; 刘咏
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-08-10
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses an experimental apparatus for solidification action is observed to high accuracy heat preservation module and normal position, wherein, high accuracy heat preservation module includes: the first heat preservation unit comprises a first heat source and a first heat transfer structure, the first heat source is provided with a first heat exchange surface, and the first heat transfer structure is arranged close to the first heat exchange surface of the refrigeration heating sheet; the second heat preservation unit is arranged at intervals with the first heat preservation unit; the second heat preservation unit comprises a second heat source and a second heat transfer structure, the second heat source is provided with a second heat exchange surface, and the second heat transfer structure is arranged close to the second heat surface; one of the first heat exchange surface and the second heat exchange surface is in a high-temperature state, the other one is in a low-temperature state, and the first heat transfer structure and the second heat transfer structure are both in a hollow plate shape so as to respectively form a stable hot temperature field and a stable cold temperature field inside the first heat transfer structure and the second heat transfer structure for the same sample to pass through. The utility model discloses technical scheme can provide stable cold and hot temperature field to the accurate change condition of observing the sample solid-liquid interface between cold and hot temperature field.

Description

High-precision heat-preservation module and experimental device for observing solidification behavior in situ

Technical Field

The utility model relates to a survey the source and shine real-time observation technical field, in particular to high accuracy heat preservation module and normal position observe experimental apparatus of solidification action.

Background

The principle of the method is that coherent scattering is generated by the action of X-rays and regularly arranged atoms in a melt, and internal atom arrangement information is obtained, so that characteristic parameters reflecting the structure of the metal melt are obtained.

The surface and interface phenomena of the high-temperature melt are very common in the fields of metallurgy, chemical engineering, molten salt, material science and the like, and the measurement of the interface movement in the solidification process of the high-temperature melt is of great significance. For high-temperature melts, such as liquid metals, molten salts and the like, the surface properties and mutual interface properties of the high-temperature melts play a dominant role in the reaction and separation of the melts, and are also the basis for researching the reaction kinetics of the melt interface.

The sample container in the existing detection source irradiation real-time observation technology is composed of a sealing box, a heating unit, a heat preservation unit and a temperature measurement unit are arranged in the sealing box, and the experimental mode is that the sample unit is arranged at the heating unit of the sealing box, heated and melted, and then irradiated and observed through a detection unit. However, this method cannot accurately observe the melting and solidifying interface of the sample, and conveniently observe the change of the melt state of the sample at different positions in the temperature field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high accuracy heat preservation module, aim at solving the melting solidification interface that current real-time observation technique can't the accurate observation sample to and observe the technical problem of the change of sample fuse-element state when different positions in the temperature field conveniently.

In order to achieve the above object, the utility model provides a high accuracy heat preservation module, include:

the first heat preservation unit comprises a first heat source and a first heat transfer structure, the first heat source is provided with a first heat exchange surface, and the first heat transfer structure is arranged close to the first heat exchange surface; and

the second heat preservation unit and the first heat preservation unit are arranged at intervals in the first direction; the second heat preservation unit comprises a second heat source and a second heat transfer structure, the second heat source is provided with a second heat exchange surface, and the second heat transfer structure is arranged close to the second heat exchange surface; wherein the content of the first and second substances,

one of the first heat exchange surface and the second heat exchange surface is in a high-temperature state, the other one of the first heat exchange surface and the second heat exchange surface is in a low-temperature state, and the first heat transfer structure and the second heat transfer structure are both in a hollow plate shape so as to respectively form a stable hot temperature field and a stable cold temperature field inside the first heat transfer structure and the second heat transfer structure for the same sample to pass through.

Optionally, the first heat transfer structure and/or the second heat transfer structure are made of an aluminum alloy material.

Optionally, the first heat transfer structure is connected with the first heat exchange surface through heat-conducting silica gel; and/or

The second heat transfer structure is connected with the second heat exchange surface through heat-conducting silica gel.

Optionally, the first heat source further includes a first heat dissipation surface disposed opposite to the first heat exchange surface, and a preset temperature difference is maintained between the first heat dissipation surface and the first heat exchange surface; and/or

The second heat source further comprises a second heat dissipation surface opposite to the second heat exchange surface, and a preset temperature difference is maintained between the second heat dissipation surface and the second heat exchange surface.

Optionally, the first heat source and the second heat source are both TEC cooling and heating plates, two opposite surfaces of the TEC cooling and heating plates respectively form a heat exchange surface and a heat dissipation surface, and the cooling and heating states of the heat exchange surface and the heat dissipation surface are interchangeable based on the current direction in which the TEC cooling and heating plates are connected.

Optionally, the first heat preservation unit further includes a first heat dissipation structure, and the first heat dissipation structure is disposed in close contact with the first heat dissipation surface; and/or

The second heat preservation unit further comprises a second heat dissipation structure, and the second heat dissipation structure is tightly attached to the second heat dissipation surface.

Optionally, the first heat dissipation structure and the second heat dissipation structure are water cooling circulation systems.

Optionally, the heat preservation device further comprises a temperature control unit connected with the first heat preservation unit and the second heat preservation unit.

Optionally, the temperature of the temperature field generated inside the first heat transfer structure and/or the second heat transfer structure ranges from-20 ℃ to 1400 ℃.

The utility model discloses still provide an experimental apparatus of normal position observation solidification action, including casing, sample and high accuracy heat preservation module, the high accuracy heat preservation module includes:

one of the first heat exchange surface and the second heat exchange surface is in a high-temperature state, the other one of the first heat exchange surface and the second heat exchange surface is in a low-temperature state, and the first heat transfer structure and the second heat transfer structure are both in a hollow plate shape so as to respectively form a stable hot temperature field and a stable cold temperature field inside the first heat transfer structure and the second heat transfer structure for a same sample to pass through;

the sample passes through a temperature field formed inside the first heat transfer structure and the second heat transfer structure.

The utility model discloses technical scheme forms stable temperature field through the inside cavity structure that utilizes heat transfer structure, arranges the both ends of sample extending direction in high temperature field and low temperature field respectively again, then the middle section of sample must form stable melting interface, at last through X ray or other detection source to the sample the middle section the melting interface shine observe can, experiment easy and simple to handle, temperature control is accurate. More, through utilizing the cooperation of first drive division and drive mechanism, drive the rectangular shape sample of thin slice and move between high temperature district and low temperature district to clearly observe the change condition of solid-liquid interface in the sample, the trend of solid-liquid interface towards hot junction or cold junction promptly. Specifically, when the upper part is a high-temperature region and the lower part is a low-temperature region, the upper half section of the sample is liquid and the lower half section of the sample is solid, and a pull-down sample (pulled along the gravity) is adopted to enable the crystal to grow upwards (along the direction opposite to the gravity); when the upper part is a low-temperature region and the lower part is a high-temperature region, the upper half section of the sample is solid and the lower half section of the sample is liquid, and the crystal grows downwards (along the gravity direction) by adopting the lifting of the sample (counter-gravity lifting); the device can be poured to be horizontally placed, the high-temperature area and the low-temperature area are horizontally placed at the moment, and the sample is pulled in the horizontal direction (the pulling in the left direction and the pulling in the right direction can be performed), so that the crystal grows towards the left or the right (is vertical to the gravity direction); in addition, the device can be obliquely arranged to realize any included angle such as 45 degrees between the drawing direction of the sample and the gravity direction, so that the crystal grows obliquely (the included angle is 0-90 degrees with the gravity direction); in other words, the method can freely set the included angle between the crystal solidification direction and the gravity direction, so as to realize in-situ observation of the crystal growth behavior under the condition of no included angle and research the influence rule of the crystal growth behavior under different gravity action conditions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an experimental apparatus for in-situ observation of solidification behavior according to the present invention;

FIG. 2 is a schematic diagram of another perspective of the experimental setup for in situ observation of coagulation behavior in FIG. 1;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is a schematic diagram of the experimental apparatus for in-situ observation of coagulation behavior in FIG. 1.

The reference numbers illustrate:

1. a housing; 11. an observation window; 2. a high-precision heat-preserving module; 21. a first heat-preserving unit; 211. a first heat transfer structure; 212. a first heat source; 213. a heat dissipation structure; 22. a second heat-preserving unit; 3. a sample stage; 31. a pedestal; 32. a support; 321. an installation position; 4. a sample; 5. a transmission mechanism; 51. a first lead screw; 52. a first sliding table; 6. first motor

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a high accuracy heat preservation module and have this high accuracy heat preservation module's normal position observe the experimental apparatus of solidification action.

In this embodiment, referring to fig. 1 to 4, the experimental apparatus for in-situ observation of the solidification behavior includes a casing 1, and a high-precision heat preservation module 2, a sample stage 3, and a sample 4, which are disposed in the casing 1; it should be noted that, in other embodiments, the high-precision thermal module 2 may also be specifically applied to other experimental apparatuses, and the design is not limited thereto.

The embodiment of the present invention provides an embodiment, this high accuracy heat preservation module 2 includes:

the first heat preservation unit 21 comprises a first heat source 212 and a first heat transfer structure 211, wherein the first heat source 212 is provided with a first heat exchange surface, and the first heat transfer structure 211 is arranged close to the first heat exchange surface; and

a second heat-preserving unit 22 spaced apart from the first heat-preserving unit 21 in the first direction; the second heat preservation unit 22 comprises a second heat source and a second heat transfer structure, the second heat source is provided with a second heat exchange surface, and the second heat transfer structure is arranged close to the second heat exchange surface; wherein the content of the first and second substances,

one of the first heat exchange surface and the second heat exchange surface is in a high temperature state, and the other one is in a low temperature state, and the first heat transfer structure 211 and the second heat transfer structure are both in a hollow plate shape so as to respectively form a stable hot temperature field and a stable cold temperature field inside for the same sample 4 to pass through.

It can be understood that the housing 1 is provided with the observation window 11 corresponding to the space between the first heat preservation unit 21 and the second heat preservation unit 22, the high-precision heat preservation module 2 is arranged beside the sample stage 3, the housing includes a pedestal 31 and a bracket 32 extending from the pedestal 31, the free end of the bracket 32 is provided with a mounting position 321 corresponding to the high-precision heat preservation module 2, the sample 4 is mounted in the mounting position 321, the sample 4 is in a strip shape, one part of the sample is located in the temperature field of the first heat transfer structure 211, and the other part of the sample is located in the temperature field of the second heat transfer structure, so that the part between the two forms a melting interface of a high temperature and low temperature junction, and receives the detection rays emitted from the observation window 11, so as to perform experimental observation. The detection radiation is not limited to X-rays or optical radiation, and it is understood that a plurality of detection sources irradiate the observation sample 4, and can be used for proving and comparing the observation results of each group to better improve the accuracy of the experimental data.

In particular, in order to observe the change of the melting interface of the sample 4 during the movement, in the embodiment, the experimental device for in-situ observation of the solidification behavior further comprises a transmission mechanism 5 and a first driving part; the transmission mechanism 5 includes a first guide rail and a first sliding portion fitted to each other, the first guide rail having an extension component in the first direction, the first sliding portion being fitted to the pedestal 31; the first driving part is connected with the transmission mechanism 5 and drives the first sliding part to move along the first guide rail so as to drive the sample stage 3 to move in the first direction and further drive the sample 4 to move between the hot temperature field and the cold temperature field. Without loss of generality, the first guide rail and the first sliding part are respectively a first screw 51 and a first sliding table 52 which are mutually matched, and the first driving part is a first motor 6 for driving the first screw 51 to rotate. In this embodiment, the first direction is the same as the height direction of the casing 1, that is, the first heat preservation unit 21 and the second heat preservation unit 22 are arranged at intervals up and down, so that the characteristic of large size of the casing 1 up and down is fully utilized, and the temperature field range or the movement range of the sample 4 is enlarged; of course, in other embodiments, the first direction may also be the same as the length direction or the width direction of the casing 1, and the design is not limited thereto. For the observation window 11 between the high temperature region and the low temperature region, in this embodiment, the observation window 11 in a circular shape (with a diameter of 48 mm) is opened on both opposite sides of the casing 1, for example, but not limited to, in other embodiments, the observation window 11 is not limited to other shapes such as a rectangle, a triangle, etc. It should be noted that the sample 4 of the present invention is designed as a strip-shaped thin slice, on one hand, to increase the heating area, and on the other hand, to extend the span of the sample 4 between different temperature fields, both of which are for better observing the solid-liquid interface of the sample 4, and the preferred dimensions of the sample 4 are 1-5mm in thickness, 10-20mm in width, and 150-200mm in height. It should be noted that the present invention also develops a special control software, which is connected with the casing 1 to perform remote control and recording on the experimental process.

The utility model discloses technical scheme forms stable temperature field through the inside cavity structure that utilizes heat transfer structure, arranges sample 4 extending direction's both ends in high temperature field and low temperature field respectively again, then must form stable melting interface in sample 4's middle section, through survey the ray at last 4 middle sections of sample the melting interface shine observe can, experiment easy and simple to handle, temperature control is accurate. More, the first driving part is matched with the transmission mechanism 5 to drive the thin strip-shaped sample 4 to move between the high-temperature area and the low-temperature area, so that the change condition of the solid-liquid interface in the sample 4, namely the change trend of the solid-liquid interface towards the hot end or the cold end, is clearly observed.

Alternatively, the first heat transfer structure 211 and/or the second heat transfer structure are made of an aluminum alloy material. It can be understood that the aluminum alloy material has the characteristics of good heat conduction effect and easy obtaining, and certainly, in other embodiments, the first heat transfer structure 211 and the second heat transfer structure may also be specifically made of copper material, and the design is not limited thereto.

Optionally, the first heat transfer structure 211 is connected to the first heat exchange surface through a heat-conducting silica gel; and/or the second heat transfer structure is connected with the second heat exchange surface through the heat-conducting silica gel. It will be appreciated that such an arrangement is advantageous to minimise heat loss between the heat source and the heat transfer structure.

Optionally, the first heat source 212 further includes a first heat dissipation surface disposed opposite to the first heat exchange surface, and a preset temperature difference is maintained between the first heat dissipation surface and the first heat exchange surface; the second heat source also comprises a second heat dissipation surface which is arranged opposite to the second heat exchange surface, and a preset temperature difference is maintained between the second heat dissipation surface and the second heat exchange surface. For example, but not limited to, the first heat source 212 and the second heat source are both TEC cooling and heating plates, and opposite surfaces of the TEC cooling and heating plates respectively form a heat exchange surface and a heat dissipation surface, and cooling and heating states of the heat exchange surface and the heat dissipation surface are interchangeable based on a current direction in which the TEC cooling and heating plates are connected. The TEC refrigerating and heating plate is a heat pump, and utilizes Peltier effect of semiconductor material, when the direct current passes through the couple formed by connecting two different semiconductor materials in series, the two ends of the couple can respectively absorb heat and release heat, so as to realize the purpose of refrigeration. When the power is on, one side of the refrigerating and heating sheet refrigerates, the other side releases heat, and a temperature difference (about 40-85 ℃ depending on the type of material) is formed between the two sides. In order to increase the temperature difference between the two side surfaces of the TEC refrigeration heating plate, the first heat preservation unit 21 further includes a first heat dissipation structure 213, the first heat dissipation structure 213 is disposed to be close to the first heat dissipation surface, the second heat preservation unit 22 further includes a second heat dissipation structure 213, and the second heat dissipation structure 213 is disposed to be close to the second heat dissipation surface; in this embodiment, the heat dissipation structure 213 is a water cooling circulation system, i.e., an aluminum alloy water cooling block with the same size as the TEC cooling/heating plate, and the inside of the heat dissipation structure is circulated with circulating water, and the outside of the heat dissipation structure is heat exchanged with a water pump. It should be noted that, in long-time work, the temperature of the water-cooling circulating water tank will gradually rise due to heat exchange, so that a large-capacity container should be adopted as far as possible or cold water should be replaced in time. Without loss of generality, the temperature of the temperature field generated inside the first heat transfer structure 211 and/or the second heat transfer structure is in the range of-5 ℃ to 180 ℃ with the help of a water cooling system. It should be noted that, the temperature range achievable by the thermal field is smaller by limiting the heating manner of the semiconductor in this embodiment, but it is not excluded that in other embodiments of the present invention, the high temperature heating manner is used instead, so that the temperature range of the experimental apparatus can reach-20 ℃ to 1400 ℃.

In addition, the positive electrode and the negative electrode of the TEC refrigerating and heating plate are reversely electrified, so that the original refrigerating surface is converted into a heat radiating surface. Therefore, the half-body refrigerating sheet can realize the functions of refrigeration and heating by controlling the positive and negative electrodes of the power supply. Thereby facilitating the experimenter to observe the change condition of the melting interface in the sample 4 when the temperature field is inverted. It is easy to understand that the high-precision heat preservation module 2 further comprises a temperature control unit connected with the first heat preservation unit 21 and the second heat preservation unit 22, the temperature control module can work in a learning self-tuning PID temperature control mode according to the technical requirement, the temperature control precision is +/-0.5 degrees, 2-way control is adopted for temperature control driving, the temperature of each way is freely set and does not interfere with each other, and the design realizes the quick switching of the positive connection and the reverse connection of the positive electrode and the negative electrode. The requirement of free conversion of high and low temperature areas of the equipment is met, the temperature control plate and the computer can carry out software communication and data receiving and sending, the equipment power supply is 12V, and the single-path maximum power is 72A.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a high accuracy heat preservation module for the experimental apparatus of solidification action is observed to normal position, its characterized in that includes:

2. The high accuracy thermal module of claim 1, wherein the first heat transfer structure and/or the second heat transfer structure is made of an aluminum alloy material.

3. The high accuracy thermal module of claim 1, wherein the first heat transfer structure is attached to the first heat exchange surface by a thermally conductive silicone; and/or

4. The high accuracy thermal module of claim 1, wherein the first heat source further comprises a first heat dissipation surface disposed opposite the first heat exchange surface, wherein a predetermined temperature differential is maintained between the first heat dissipation surface and the first heat exchange surface; and/or

5. The high-precision thermal module of claim 4, wherein the first heat source and the second heat source are both TEC cooling and heating plates, and heat exchange surfaces and heat dissipation surfaces are respectively formed on two opposite surfaces of the TEC cooling and heating plates, and cooling and heating states of the heat exchange surfaces and the heat dissipation surfaces are interchangeable based on a current direction communicated by the TEC cooling and heating plates.

6. The high-precision thermal module according to claim 4, wherein the first thermal unit further comprises a first heat dissipation structure, and the first heat dissipation structure is disposed in close contact with the first heat dissipation surface; and/or

7. The high accuracy thermal module of claim 6, wherein the first and second heat dissipation structures are water cooling circulation systems.

8. The high accuracy thermal module of claim 1, further comprising a temperature control unit coupled to both the first thermal unit and the second thermal unit.

9. The high precision thermal module according to any one of claims 1 to 8, wherein the temperature of the temperature field generated inside the first heat transfer structure and/or the second heat transfer structure ranges from-20 ℃ to 1400 ℃.

10. An experimental device for observing solidification behaviors in situ, which comprises a machine shell, a sample and the high-precision heat preservation module as claimed in any one of claims 1 to 9, wherein the sample passes through a temperature field formed inside the first heat transfer structure and the second heat transfer structure.