Experiment piece structure applied to flow boiling heat transfer in rectangular micro channel

Abstract

The invention provides an experiment piece structure applied to flow boiling heat transfer in a rectangular micro channel, and belongs to the technical field of gas-liquid two-phase flow experiments.The experiment piece structure comprises a middle main body, a sealing groove is formed in the upper portion of the middle main body, a sealing ring is embedded into the sealing groove, the micro channel is formed in the upper portion of the middle main body, and the sealing ring is embedded into the sealing groove; the heating copper block is embedded into the micro channel, first bolt holes are formed in the periphery of the sealing groove in the middle body, and second bolt holes and third bolt holes are formed in the corresponding positions of the cover plate and the bottom plate respectively. The experiment piece structure applied to flow boiling heat transfer in the rectangular micro channel is adopted, the limitation of an existing heating and temperature measuring mode is overcome, and meanwhile the requirements for miniaturization, compactness, electrical insulation, thermal insulation, assembly and sealing of the experiment piece are met.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid two-phase flow experiments, and in particular to an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel. Background Art

[0002] Due to the influence of micro-scale effects, there are differences in heat transfer and flow characteristics between micro-channels and conventional channels, and there are some restrictions on the heating method, measurement method and working fluid selection used in the experiment. Usually, the micro-channel experimental piece chooses low-power heating methods such as ITO (indium tin oxide) film and heating glass for heating; non-contact temperature measurement methods such as infrared temperature measurement, temperature-sensitive paint temperature measurement and fluorescent molecular temperature measurement for measurement; organic working fluids such as HFE-7100, FC-72 and R245fa are selected as working fluids.

[0003] In the study of boiling heat transfer in rectangular microchannels, it is necessary to enrich the selection of working fluids, such as deionized water. Because it has a higher boiling point and specific heat capacity than organic working fluids, it requires more heat when heated to a boiling state. However, the two low-power heating methods of ITO film and heating glass are difficult to provide sufficient heat. Therefore, the method of installing a heating rod in a copper block is chosen to use the heat conduction of the copper block to heat the fluid. In order to capture temperature changes faster and more accurately, and considering factors such as its simple structure and experimental cost, a contact temperature measurement method such as thermocouples is chosen. However, in traditional copper substrate heating, thermocouples are generally fixed in the copper block and cannot be changed or replaced at will. Once damaged, if the established experimental goals need to be completed, the entire copper block needs to be replaced, and the experimental cost is high.

[0004] In addition to the above-mentioned deficiencies of the known heating methods and temperature measurement methods, there are still some technical difficulties in the experiment of flow boiling heat transfer of deionized water, such as miniaturization and compactness of the experimental piece, electrical insulation and thermal insulation, assembly and sealing, etc. Therefore, providing an experimental piece structure for flow boiling heat transfer in rectangular microchannels has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide an experimental piece structure for flow boiling heat transfer in a rectangular micro-channel, which overcomes the limitations of existing heating and temperature measurement methods and meets the requirements of miniaturization, compactness, electrical insulation, thermal insulation, assembly and sealing of the experimental piece.

[0006] To achieve the above-mentioned purpose, the present invention provides an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel, including an intermediate body, a sealing ring and a cover plate are sequentially arranged above the intermediate body, and a heating copper block and a bottom plate are sequentially arranged below the intermediate body; a sealing groove is opened above the intermediate body, the sealing ring is embedded in the sealing groove, a micro-channel is opened above the intermediate body, and the heating copper block is embedded in the micro-channel, a first bolt hole is opened around the sealing groove on the intermediate body, and a second bolt hole and a third bolt hole are respectively opened at corresponding positions of the cover plate and the bottom plate.

[0007] Preferably, an inlet static pressure chamber and an outlet static pressure chamber are respectively provided at both ends of the micro-channel on the intermediate body, a working fluid inlet is provided at one end of the inlet static pressure chamber, the inlet static pressure chamber is connected to the working fluid inlet, a working fluid outlet is provided at one end of the outlet static pressure chamber, the outlet static pressure chamber is connected to the working fluid outlet, a first through hole penetrating the inlet static pressure chamber is provided on the intermediate body, and the two ends of the first through hole are a working fluid inlet temperature measuring hole and a working fluid inlet pressure measuring hole, respectively, a second through hole penetrating the outlet static pressure chamber is provided on the intermediate body, and the two ends of the second through hole are a working fluid outlet temperature measuring hole and a working fluid outlet pressure measuring hole, respectively.

[0008] Preferably, an area is opened directly below the microchannel, a second area is opened below the one area, a third area is opened on the right side of the second area, the cross-section of the three areas is composed of two intersecting rectangles, a fourth area is opened on the side of the three areas, the cross-section of the four areas is composed of two non-intersecting rectangles; multiple rows of thermocouple temperature measuring holes are opened on the front side of the intermediate body, and the thermocouple temperature measuring holes penetrate into one area.

[0009] Preferably, the heating copper block is composed of a top zone, a temperature measuring zone and a heating zone from top to bottom, the top of the top zone is embedded in a tiny channel, a temperature measuring hole is opened on the temperature measuring zone, a thermocouple wire is arranged at the center of the temperature measuring hole, a gasket is laid above the temperature measuring zone, the heating zone is provided with triangularly distributed heating rods, and ceramic fiber paper is laid on the heating zone and the temperature measuring zone except the top.

[0010] Preferably, the temperature measuring zone and the PTFE gasket laid above the temperature measuring zone are placed in one area, the temperature measuring zone and the gasket laid above the temperature measuring zone are placed in one area, the heating zone and the part laid with ceramic fiber paper are placed in the second area, a heating rod wire is provided at one end of the heating rod, and the heating rod wire is placed in the third area and the fourth area.

[0011] Preferably, there are four rows of the first bolt holes, the bolt holes in the first row and the fourth row have the same diameter, the bolt holes in the second row and the third row have the same diameter, and the structures of the second bolt holes and the third bolt holes are the same as the first bolt holes.

[0012] Preferably, a shallow groove is opened in the middle area of ​​the bottom plate, the heating copper block is fixed on the shallow groove, and the third bolt hole is opened outside the shallow groove.

[0013] Preferably, the cover plate is made of PC material, the sealing ring is made of silicone material, the intermediate body is made of PEEK material, and the bottom plate is made of PEEK material.

[0014] Preferably, the cross-section of the microchannel is rectangular, and a working medium flows in the microchannel, and the working medium is deionized water.

[0015] The present invention provides an experimental piece structure for flow boiling heat transfer in a rectangular micro-channel, and the installation steps are as follows:

[0016] S1. Assemble the heating copper block: select a thermocouple wire of appropriate length, peel off the outer shell of the thermocouple wire to expose the two thin wires inside, tightly contact the two exposed thin wires together, use a spot welder to weld a small ball at the front end of the thermocouple wire, weld the thermocouple wire to the center of the temperature measuring hole, and use high-temperature glue to fill the remaining space in the temperature measuring hole; insert three heating rods into the heating zone of the heating copper block, lay a gasket above the temperature measuring zone, lay ceramic fiber paper on the remaining surfaces except above the temperature measuring zone and above the top zone, and lay multiple layers of ceramic fiber paper below the heating zone;

[0017] S2. Assemble the sealing ring, the heating copper block and the middle body: put the sealing ring into the groove in the middle body, put the heating copper block in from the bottom of the middle body until the gasket is pressed against the middle body above the temperature measuring area of ​​the heating copper block. When putting in the heating copper block, make sure that the thermocouple wire welded in the temperature measuring area passes through the thermocouple temperature measuring hole, and make sure that the heating rod wire passes through the third and fourth areas.

[0018] S3. Assemble the cover plate, bottom plate and middle body: Place the heated copper block in the shallow groove in the bottom plate, and align the middle body with the bottom plate completely. Align the cover plate with the middle body, and use bolts to fix the cover plate, middle body and bottom plate together to complete the assembly of the entire experimental piece.

[0019] Therefore, the present invention adopts the above-mentioned experimental piece structure applied to flow boiling heat transfer in rectangular micro-channels, and the technical effects are as follows:

[0020] 1. Miniaturization and compactness of experimental pieces: Through reasonable structural design, miniaturization and compactness of experimental pieces are achieved, which is conducive to saving experimental space and improving the convenience and flexibility of the experiment.

[0021] 2. Enriched the choice of working fluids: The experimental structure adopts the method of installing a heating rod in a copper block to heat the micro-channel, realizing the flow boiling of deionized water in the rectangular micro-channel. This enriches the choice of working fluids in the flow boiling heat transfer research in the rectangular micro-channel and provides more possibilities for scientific research.

[0022] 3. Optimization of temperature measurement method: By welding the thermocouple to the heating copper block, the installation, removal and replacement of the thermocouple are realized, which is not only convenient and flexible, but also improves the accuracy and reliability of temperature measurement.

[0023] 4. Improvement of thermal insulation and electrical insulation performance: Materials such as ceramic fiber paper and PTFE (polytetrafluoroethylene) gaskets are used in the experimental piece. These materials have good thermal insulation performance, which can effectively reduce the heat dissipation of the heating copper block and improve the thermal efficiency of the experimental piece. At the same time, these materials also have certain electrical insulation properties, which helps to ensure the safety of the experiment.

[0024] 5. Enhanced sealing: By using a sealing ring made of silicone material and utilizing the extrusion deformation of the PTFE gasket to enhance the sealing, the experimental piece structure can ensure the effective isolation of the microchannel interior from the external environment, prevent the leakage of internal working fluid and external air, thereby ensuring the accuracy and reliability of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel of the present invention;

[0026] Figure 2 It is a schematic diagram of the middle main body structure of an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel of the present invention;

[0027] Figure 3 A schematic diagram of a heating copper block structure of an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel of the present invention;

[0028] Figure 4 It is a front view of an experimental piece of an experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel of the present invention;

[0029] Figure 5 A top view of an experimental piece of the experimental piece structure applied to flow boiling heat transfer in a rectangular micro-channel of the present invention;

[0030] Figure 6 The present invention is an assembly diagram of an experimental piece structure used for flow boiling heat transfer in a rectangular micro-channel.

[0031] Reference numerals

[0032] 1. Cover plate; 2. Sealing ring; 3. Middle body; 4. Heating copper block; 5. Bottom plate; 31. Micro channel; 32. Working fluid; 33. Inlet static pressure chamber; 34. Outlet static pressure chamber; 35. Working fluid inlet; 36. Working fluid outlet; 37. Working fluid inlet temperature measuring hole; 38. Working fluid outlet temperature measuring hole; 39. Working fluid inlet pressure measuring hole; 310. Working fluid outlet pressure measuring hole; 311. First bolt hole; 41. Top area; 42. Temperature measuring area; 43. Heating area; 44. Temperature measuring hole; 45. Heating rod; 46. Heating rod wire hole; 47. PTFE gasket; 48. Ceramic fiber paper. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0034] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0035] Embodiment 1

[0036] like Figure 1 , Figure 4 , Figure 5 , Figure 6 As shown, the present invention provides an experimental piece structure for flow boiling heat transfer in a rectangular micro-channel, including a middle body 3, a sealing ring 2 and a cover plate 1 are sequentially arranged above the middle body 3, and a heating copper block 4 and a bottom plate 5 are sequentially arranged below the middle body 3. A sealing groove is opened above the middle body 3, and the sealing ring 2 is embedded in the sealing groove and is pressed between the cover plate 1 and the middle body 3. The sealing ring 2 is made of silicone material and uses its own deformation to enhance the sealing performance.

[0037] like Figure 2 As shown, a micro channel 31 is provided on the top of the middle body 3, and the top of the heating copper block 4 is embedded in the micro channel 31. The first bolt holes 311 are provided around the sealing groove on the middle body 3. There are 26 first bolt holes 311 in total. The first and fourth rows of the first bolt holes 311 are both 11 bolt holes with a diameter of 5 mm, and the second and third rows of the first bolt holes 311 are both 2 bolt holes with a diameter of 4 mm. The bolt holes are symmetrical in the horizontal and vertical directions. The second bolt hole and the third bolt hole are provided at the corresponding positions of the cover plate 1 and the bottom plate 5, respectively. The cover plate 1 and the bottom plate 5 are connected to the middle body by bolts to ensure that the inside of the micro channel is isolated from the external environment, and to prevent the internal working fluid 32 from leaking out and the external air from leaking in.

[0038] An inlet static pressure chamber 33 and an outlet static pressure chamber 34 are respectively provided at both ends of the micro-channel 31 on the middle body 3. The inlet static pressure chamber 33 is connected to the working medium inlet 35, and the outlet static pressure chamber 34 is connected to the working medium outlet 36. A channel for the working medium 32 with a diameter of 5 mm flows between the inlet static pressure chamber 33 and the outlet static pressure chamber 34. A first through hole penetrating the inlet static pressure chamber 33 is provided on the middle body 3. The two ends of the first through hole are respectively a working medium inlet temperature measuring hole 37 and a working medium inlet pressure measuring hole 39. A second through hole penetrating the outlet static pressure chamber 34 is also provided on the middle body 3. The two ends of the second through hole are respectively a working medium outlet temperature measuring hole 38 and a working medium outlet pressure measuring hole 310. Thermocouples are connected to the working medium inlet temperature measuring hole 37 and the working medium outlet temperature measuring hole 38 to measure temperature, and pressure gauges are connected to the working medium inlet pressure measuring hole 39 and the working medium outlet pressure measuring hole 310 to measure pressure.

[0039] The size of the micro-channel 31 is 100mm×2mm×2mm. There is an area directly below the micro-channel 31. The size of the area is 109mm×10mm×14.8mm. The temperature measuring area 42 and the PTFE gasket 47 laid on the top of the temperature measuring area 42 are placed in the area. There is a second area below the area. The size of the second area is 124mm×24mm×24mm. The heating area 43 and the part with the ceramic fiber paper 48 are placed in the second area. There is a third area on the right side of the second area. The cross section of the third area is composed of two intersecting rectangles. There is a fourth area on the side of the third area. The cross section of the fourth area is composed of two non-intersecting rectangles. The third area and the fourth area constitute the heating rod wire hole 46. The heating rod wire is placed in the third area and the fourth area. There are 10 rows of thermocouple temperature measuring holes on the front of the middle body 3. The thermocouple temperature measuring holes penetrate to the first area. The thermocouple temperature measuring holes are composed of two parts, a semicircle on the top and a rectangle on the bottom. Such a design is easy to process.

[0040] like Figure 3As shown, the heating copper block 4 is composed of a top area 41, a temperature measuring area 42 and a heating area 43 from top to bottom. The top of the top area 41 is used as the bottom surface of the micro-channel 31, and the top 1mm of the top area 41 is embedded in the micro-channel 31, forming a micro-channel 31 with a size of 100mm×2mm×2mm in the experimental piece, so that the heat can be used to heat the working medium as much as possible, and the thermal efficiency in the experimental piece can be calculated. The temperature measuring area 42 is provided with 3 rows and 10 columns of temperature measuring holes 44 with a depth of 3mm to improve the accuracy and reliability of the temperature of the measuring point. The depth of the temperature measuring hole 44 is 3mm, and a thermocouple wire is welded at the center of the temperature measuring hole 44. This method is reversible, and the thermocouple can be installed, disassembled and replaced, which is convenient and flexible. The heating area 43 is provided with three triangularly distributed heating rods 45, so that it can be assumed that the heat is only transferred upward along the axial direction, which is simplified to a one-dimensional heat conduction model. The temperature of 10 local measuring points on the bottom surface of the micro-channel 31 can be calculated by Fourier's heat conduction law. A PTFE gasket 47 is laid above the temperature measuring area 42, and the sealing is enhanced by squeezing the gasket. Ceramic fiber paper 48 is laid on the heating area 43 and the temperature measuring area 42 except the upper part to reduce the heat dissipation of the heating copper block 4. Multiple layers of ceramic fiber paper 48 can be laid under the temperature measuring area 42 to ensure that the heating copper block 4 is not pressed down after assembly, so as to avoid changes in the size of the micro channel 31.

[0041] The cover plate 1 is made of PC material, and a second bolt hole having the same structure as the first bolt hole 311 is provided on the cover plate 1. The PC material has good transparency, so it can provide conditions for visual observation of the flow and boiling of the working medium 32 in the micro-channel 31. The cover plate 1 tightly covers the middle body 3 to ensure that the inside of the micro-channel 31 is isolated from the external environment, and prevent the internal working medium 32 from leaking out and the external air from leaking in.

[0042] The middle body 3 is the main component of the whole experimental piece, and is made of PEEK (polyetheretherketone) material. Because of its high temperature resistance, it can withstand the temperature of the heated copper block. Because of its high mechanical strength, a tiny channel 31, an inlet and outlet static pressure chamber, etc. can be processed therein. The bottom plate 5 is made of PEEK material, and a shallow groove is processed in the middle area thereof to fix the heated copper block 4. A third bolt hole with the same structure as the first bolt hole 311 is opened on the bottom plate 5.

[0043] The working medium 32 uses deionized water with the advantages of high purity, low electrical conductivity, high relative dielectric constant, easy cleaning, high cost-effectiveness and good stability; the thermocouple uses thermocouple wire, which has the advantages of wide temperature measurement range, fast response speed, high mechanical strength, bendable installation and convenient maintenance.

[0044] The present invention provides an experimental piece structure for flow boiling heat transfer in a rectangular micro-channel, and the installation steps are as follows:

[0045] S1. Assemble the heating copper block: select a thermocouple wire of appropriate length, peel off the outer shell of the thermocouple wire by about 10 mm to expose the two thin wires inside, contact the two exposed thin wires as closely as possible, use a spot welder to weld a small ball at the front end of the thermocouple wire, weld the thermocouple wire to the center of the temperature measuring hole, and use high-temperature glue to fill the remaining space in the temperature measuring hole; insert three heating rods into the heating zone of the heating copper block, lay a PTFE gasket above the temperature measuring zone, lay ceramic fiber paper on the remaining surfaces except above the temperature measuring zone and above the top zone, and lay multiple layers of ceramic fiber paper below the heating zone;

[0046] S2. Assemble the sealing ring, heating copper block and the middle body: put the sealing ring into the groove in the middle body, and gently put the heating copper block in from the bottom of the middle body until the PTFE gasket is pressed tightly against the middle body above the temperature measuring area of ​​the heating copper block. When putting in the heating copper block, make sure that the thermocouple wire welded in the temperature measuring area passes through the thermocouple temperature measuring hole, and make sure that the heating rod wire passes through the third and fourth areas;

[0047] S3. Assemble the cover plate, bottom plate and middle body: Place the heated copper block in the shallow groove in the bottom plate, and align the middle body with the bottom plate completely. Align the cover plate with the middle body, and use bolts to fix the cover plate, middle body and bottom plate together to complete the assembly of the entire experimental piece.

[0048] Therefore, the present invention adopts the above-mentioned experimental piece structure applied to flow boiling heat transfer in rectangular micro-channels. The experimental piece is miniaturized and compact through reasonable design, saving space; the copper block heating method is adopted to enrich the working fluid selection for flow boiling heat transfer research in rectangular micro-channels; the optimized installation of thermocouples improves the temperature measurement accuracy; the application of materials such as ceramic fiber paper and PTFE improves the thermal insulation and electrical insulation properties, and enhances the experimental efficiency and safety.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An experimental structure for flow boiling heat transfer in a rectangular microchannel, characterized in that: It includes an intermediate body, a sealing ring and a cover plate are arranged on the upper part of the intermediate body in sequence, and a heating copper block and a bottom plate are arranged on the lower part of the intermediate body in sequence; a sealing groove is opened on the upper part of the intermediate body, and the sealing ring is embedded in the sealing groove; a micro channel is opened on the upper part of the intermediate body, and the heating copper block is embedded in the micro channel; a first bolt hole is opened around the sealing groove on the intermediate body, and a second bolt hole and a third bolt hole are opened at corresponding positions of the cover plate and the bottom plate respectively.

2. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: An inlet static pressure chamber and an outlet static pressure chamber are respectively provided at both ends of the tiny channel on the intermediate body, a working fluid inlet is provided at one end of the inlet static pressure chamber, the inlet static pressure chamber is connected to the working fluid inlet, a working fluid outlet is provided at one end of the outlet static pressure chamber, the outlet static pressure chamber is connected to the working fluid outlet, a first through hole penetrating the inlet static pressure chamber is provided on the intermediate body, the two ends of the first through hole are respectively a working fluid inlet temperature measuring hole and a working fluid inlet pressure measuring hole, a second through hole penetrating the outlet static pressure chamber is provided on the intermediate body, the two ends of the second through hole are respectively a working fluid outlet temperature measuring hole and a working fluid outlet pressure measuring hole.

3. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: An area is opened directly below the micro-channel, a second area is opened below the first area, a third area is opened on the right side of the second area, the cross-section of the third area is composed of two intersecting rectangles, a fourth area is opened on the side of the third area, the cross-section of the four area is composed of two non-intersecting rectangles; a plurality of rows of thermocouple temperature measuring holes are opened on the front side of the intermediate body, and the thermocouple temperature measuring holes penetrate into one area.

4. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: The heating copper block is composed of a top zone, a temperature measuring zone and a heating zone from top to bottom. The top of the top zone is embedded in a tiny channel. A temperature measuring hole is opened on the temperature measuring zone. A thermocouple wire is arranged at the center of the temperature measuring hole. A gasket is laid above the temperature measuring zone. The heating zone is provided with heating rods distributed in a triangular pattern. Ceramic fiber paper is laid on the heating zone and the temperature measuring zone except the top.

5. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 4 is characterized in that: The temperature measuring zone and the gasket laid above the temperature measuring zone are placed in area one, the heating zone and the part laid with ceramic fiber paper are placed in area two, a heating rod wire is provided at one end of the heating rod, and the heating rod wire is placed in areas three and four.

6. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: There are four rows of the first bolt holes, the bolt holes in the first row and the fourth row have the same diameter, the bolt holes in the second row and the third row have the same diameter, and the structures of the second bolt holes and the third bolt holes are the same as the first bolt holes.

7. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: A shallow groove is provided in the middle area of ​​the bottom plate, the heating copper block is fixed on the shallow groove, and the third bolt hole is provided outside the shallow groove.

8. The experimental piece structure for flow boiling heat transfer in a rectangular microchannel according to claim 1 is characterized in that: The cover plate is made of PC material, the sealing ring is made of silicone material, the middle body is made of PEEK material, and the bottom plate is made of PEEK material.

9. The experimental piece structure for flow boiling heat transfer in rectangular microchannels according to claim 1, characterized in that: The cross section of the microchannel is rectangular, and a working medium flows in the microchannel, and the working medium is deionized water.

10. An experimental structure for flow boiling heat transfer in a rectangular microchannel, characterized in that: The installation steps are as follows: S1. Assemble the heating copper block: select a thermocouple wire of appropriate length, peel off the outer shell of the thermocouple wire to expose the two thin wires inside, tightly contact the two exposed thin wires together, use a spot welder to weld a small ball at the front end of the thermocouple wire, weld the thermocouple wire to the center of the temperature measuring hole, and use high-temperature glue to fill the remaining space in the temperature measuring hole; insert three heating rods into the heating zone of the heating copper block, lay a gasket above the temperature measuring zone, lay ceramic fiber paper on the remaining surfaces except above the temperature measuring zone and above the top zone, and lay multiple layers of ceramic fiber paper below the heating zone; S2. Assemble the sealing ring, the heating copper block and the middle body: put the sealing ring into the groove in the middle body, put the heating copper block in from the bottom of the middle body until the gasket is pressed against the middle body above the temperature measuring area of ​​the heating copper block. When putting in the heating copper block, make sure that the thermocouple wire welded in the temperature measuring area passes through the thermocouple temperature measuring hole, and make sure that the heating rod wire passes through the third and fourth areas. S3. Assemble the cover plate, bottom plate and middle body: Place the heated copper block in the shallow groove in the bottom plate, and align the middle body with the bottom plate completely. Align the cover plate with the middle body, and use bolts to fix the cover plate, middle body and bottom plate together to complete the assembly of the entire experimental piece.

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