High-temperature vacuum atmosphere medium-frequency induction heating furnace

Abstract

The utility model belongs to the technical field of heating furnaces, and particularly relates to a high-temperature vacuum atmosphere medium-frequency induction heating furnace which comprises an equipment body, a medium-frequency power supply is arranged on one side of the upper end of the equipment body, and a heating mechanism is arranged on the equipment body on one side of the medium-frequency power supply. A double-color infrared thermometer arranged over the heating mechanism is fixedly connected with the side wall of the containing groove, the heating mechanism comprises a heating body fixed in the containing groove, a quartz observation window is arranged on an upper water cooling flange fixed to the upper end of the heating body, a graphite crucible is arranged in the center of the interior of the heating body, and the graphite crucible is fixedly connected with the side wall of the containing groove. A heat preservation assembly is arranged on the outer side of the graphite crucible. The high-temperature vacuum atmosphere medium-frequency induction heating furnace has the advantages that the overall structure is reasonable, the size is small, the occupied space is reduced, movement is convenient, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating furnaces, in particular to a medium-frequency induction heating furnace with high temperature and vacuum atmosphere. Background Art

[0002] At present, most medium-frequency induction heating furnaces are operated under air to achieve rapid heating of samples. However, some materials need to be heated in a vacuum or atmosphere to prevent oxidation of the materials. Some gases need to react when heated, and medium-frequency induction heating furnaces above 2000 degrees generally use induction coils set inside the vacuum chamber, which will make the overall size of the equipment larger and the cost higher, which is difficult to meet the requirements of most university laboratories. Utility Model Content

[0003] The purpose of the utility model is to provide a high-temperature vacuum atmosphere medium-frequency induction heating furnace in order to solve the above problems.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] A high-temperature vacuum atmosphere medium-frequency induction heating furnace comprises an equipment body, a medium-frequency power supply is arranged on one side of the upper end of the equipment body, a heating mechanism is arranged in a placement groove opened on the equipment body on the side of the medium-frequency power supply, a two-color infrared thermometer arranged directly above the heating mechanism is fixedly connected to the side wall of the placement groove, the heating mechanism comprises a heating body fixed in the placement groove, a quartz observation window is arranged on the upper water-cooling flange fixed on the upper end of the heating body, a graphite crucible is arranged at the center position inside the heating body, a heat preservation component is arranged on the outside of the graphite crucible, a plurality of quartz tubes are arranged on the outside of the heat preservation component, the top of the quartz tube is connected to the upper water-cooling flange, and the bottom is connected to the lower water-cooling flange, and the outside of the quartz tube is sleeved with a copper water-cooled induction coil.

[0006] Preferably, the insulation assembly includes an upper insulation portion, a lower insulation portion and a side wall insulation portion.

[0007] Preferably, the upper insulation part includes a second graphite insulation felt layer fixed on the upper end of the crucible, a first graphite insulation felt layer is fixed on the upper end of the second graphite insulation felt layer, a top alumina insulation layer is fixed on the upper end of the first graphite insulation felt layer, and a through hole opened on the top of the graphite crucible extends upward to communicate with the upper water-cooling flange.

[0008] Preferably, the second graphite thermal insulation felt layer, the first graphite thermal insulation felt layer and the top alumina thermal insulation layer are all arranged in a disc shape.

[0009] Preferably, the side wall insulation portion comprises an inner graphite insulation felt layer sleeved on the outside of the graphite crucible, a boron nitride insulation ring is fixed to the outside of the inner graphite insulation felt layer, and an outer graphite insulation felt layer is fixed to the outside of the boron nitride insulation ring.

[0010] Preferably, the outer graphite thermal insulation felt layer, the inner graphite thermal insulation felt layer and the boron nitride thermal insulation ring are all configured in a cylindrical shape.

[0011] Preferably, the lower insulation part includes a third graphite insulation felt layer fixed to the bottom of the graphite crucible, a fourth graphite insulation felt layer is fixed to the bottom of the third graphite insulation felt layer, a bottom alumina insulation layer is fixed to the bottom of the fourth graphite insulation felt layer, and the connecting hole opened at the bottom of the graphite crucible extends downward to communicate with the equipment body.

[0012] Preferably, the third graphite thermal insulation felt layer, the fourth graphite thermal insulation felt layer and the bottom alumina thermal insulation layer are all configured in a disc shape.

[0013] The beneficial effects are: the high-temperature vacuum atmosphere medium-frequency induction heating furnace provided by the utility model has a relatively reasonable overall structure and a small size, which reduces the occupied area of ​​the space, is more convenient to move, reduces the cost, is simple and convenient for staff to operate, has good insulation effect and reliability, and improves the qualified rate of sample sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a three-dimensional diagram of a medium-frequency induction heating furnace in a high-temperature vacuum atmosphere described in the utility model;

[0016] Figure 2 It is a cross-sectional view of a medium frequency induction heating furnace in a high temperature vacuum atmosphere described in the utility model;

[0017] Figure 3 It is a schematic diagram of the internal structure of a heat preservation component of a medium frequency induction heating furnace in a high temperature vacuum atmosphere described in the utility model.

[0018] The following are the descriptions of the reference numerals:

[0019] 1. Equipment body; 101. Two-color infrared thermometer; 102. Heating body; 2. Medium frequency power supply; 3. Copper water-cooled induction coil; 4. Upper water-cooling flange; 5. Quartz tube; 6. Lower water-cooling flange; 7. Top alumina insulation layer; 8. First graphite insulation felt layer; 9. Second graphite insulation felt layer; 10. Graphite crucible; 11. Inner graphite insulation felt layer; 12. Boron nitride insulation ring; 13. Outer graphite insulation felt layer; 14. Third graphite insulation felt layer; 15. Fourth graphite insulation felt layer; 16. Bottom alumina insulation layer; 17. Quartz observation window. DETAILED DESCRIPTION

[0020] The following is a further explanation of the technical solution of the utility model in conjunction with the accompanying drawings:

[0021] like Figure 1-Figure 3 As shown, a high-temperature vacuum atmosphere medium-frequency induction heating furnace comprises an equipment body 1, a medium-frequency power supply 2 is arranged on one side of the upper end of the equipment body 1, a placement slot is opened on the equipment body 1 on one side of the medium-frequency power supply 2, a heating mechanism is arranged in the placement slot, the heating mechanism is connected to the equipment body 1, a two-color infrared thermometer 101 arranged directly above the heating mechanism is fixedly connected to the side wall of the placement slot, the heating mechanism comprises a heating body 102 fixed in the placement slot, an upper water-cooling flange 4 is fixed on the upper end of the heating body 102, a quartz observation window 17 is arranged on the upper water-cooling flange 4, the two-color infrared thermometer 101 can measure temperature through this quartz observation window 17, and the medium-frequency induction heating furnace can realize rapid sintering of materials in a vacuum or atmosphere environment, and the maximum heating rate can reach 300 degrees per minute.

[0022] A graphite crucible 10 is arranged at the central position inside the heating body 102, and an insulation component is arranged on the outside of the graphite crucible 10. A plurality of quartz tubes 5 are arranged on the outside of the insulation component. The plurality of quartz tubes 5 are distributed in a ring shape. The top of each quartz tube 5 is connected to an upper water-cooling flange 4, and the bottom is connected to a lower water-cooling flange 6. The upper water-cooling flange 4 is provided with an air inlet and a pressure sensor, and an upper flip-up cover structure is adopted to facilitate the taking and placing of materials. A quartz observation window 17 is arranged on the top, and a vacuum port and an exhaust port are arranged on the lower water-cooling flange 6. A copper water-cooled induction coil 3 is sleeved on the outside of the quartz tube 5, and the intermediate frequency power supply 2 is connected to the copper water-cooled induction coil 3. A touch screen is arranged in front of the intermediate frequency power supply 2, and all controls and displays are integrated on the touch screen.

[0023] Two temperature control modes are set inside the touch screen. One temperature mode uses a two-color infrared thermometer 101 for temperature control, and the other current mode can achieve a certain temperature of the graphite crucible 10 by setting the current of the medium frequency power supply 2, and the two-color infrared thermometer 101 corrects the temperature. This mode can especially solve the problem of sintering samples with volatiles, because the volatiles will block the quartz observation window 17 above, resulting in inaccurate temperature measurement by the two-color infrared thermometer 101, and even burning the surrounding insulation layer.

[0024] Multiple quartz tubes 5 are located inside the copper water-cooled induction coil 3. The graphite crucible 10 is used as an induction heating element and is placed in the quartz tube 5. It is sealed by upper and lower flanges and can be used as a container to realize sintering treatment of different materials under vacuum or atmosphere. The insulation component arranged between the quartz tube 5 and the middle graphite crucible 10 is used as an insulation material to achieve a high temperature of up to 2200 degrees for the graphite crucible 10, while ensuring that the outer quartz tube 5 will not be damaged even if the temperature exceeds the melting point of the quartz tube 5.

[0025] A graphite cover with a hole in the middle is provided on the top of the graphite crucible 10, and a through hole also runs through the middle of the upper insulation part of the graphite crucible 10, so that the two-color infrared thermometer 101 on the top can directly measure the actual temperature of the sample through the quartz observation window 17 on the top.

[0026] The copper water-cooled induction coil 3 has cooling water inside, which can effectively reduce the heat radiated from the inside, lower the surface temperature of the quartz tube 5 and the radiation temperature to the surrounding environment.

[0027] The insulation assembly includes an upper insulation part, a lower insulation part and a side wall insulation part. This structural arrangement can achieve a maximum temperature of 2200 degrees.

[0028] The upper insulation part includes a second graphite insulation felt layer 9 fixed on the upper end of the crucible, a first graphite insulation felt layer 8 is fixed on the upper end of the second graphite insulation felt layer 9, a top alumina insulation layer 7 is fixed on the upper end of the first graphite insulation felt layer 8, a through hole opened on the top of the graphite crucible 10 extends upward and is connected to the quartz observation window 17, and the second graphite insulation felt layer 9, the first graphite insulation felt layer 8 and the top alumina insulation layer 7 are all arranged in a disc shape.

[0029] The side wall insulation part includes an inner graphite insulation felt layer 11 which is sleeved on the outside of the graphite crucible 10, a boron nitride insulation ring 12 is fixed to the outside of the inner graphite insulation felt layer 11, and an outer graphite insulation felt layer 13 is fixed to the outside of the boron nitride insulation ring 12. The outer graphite insulation felt layer 13, the inner graphite insulation felt layer 11 and the boron nitride insulation ring 12 are all arranged in a cylindrical shape.

[0030] The lower insulation part includes a third graphite insulation felt layer 14 fixed to the bottom of the graphite crucible 10, a fourth graphite insulation felt layer 15 is fixed to the bottom of the third graphite insulation felt layer 14, a bottom alumina insulation layer 16 is fixed to the bottom of the fourth graphite insulation felt layer 15, and a connecting hole opened at the bottom of the graphite crucible 10 extends downward to communicate with the equipment body 1, and the third graphite insulation felt layer 14, the fourth graphite insulation felt layer 15 and the bottom alumina insulation layer 16 are all arranged in a disc shape.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A high-temperature vacuum atmosphere medium-frequency induction heating furnace, comprising an equipment body (1), a medium-frequency power supply (2) is arranged on one side of the upper end of the equipment body (1), a heating mechanism is arranged in a placement groove opened on the equipment body (1) on one side of the medium-frequency power supply (2), a two-color infrared thermometer (101) arranged directly above the heating mechanism is fixedly connected to the side wall of the placement groove, the heating mechanism comprises a heating body (102) fixed in the placement groove, a quartz observation window (17) is arranged on an upper water-cooling flange (4) fixed on the upper end of the heating body (102), a graphite crucible (10) is arranged at the central position inside the heating body (102), and the characteristics are: A heat preservation component is arranged on the outside of the graphite crucible (10), and a plurality of quartz tubes (5) are arranged on the outside of the heat preservation component. The top of the quartz tube (5) is connected to an upper water-cooling flange (4), and the bottom is connected to a lower water-cooling flange (6). A copper water-cooling induction coil (3) is sheathed on the outside of the quartz tube (5).

2. A high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 1, characterized in that: The heat-insulating assembly comprises an upper heat-insulating portion, a lower heat-insulating portion and a side wall heat-insulating portion.

3. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 2, characterized in that: The upper insulation part comprises a second graphite insulation felt layer (9) fixed to the upper end of the crucible, a first graphite insulation felt layer (8) is fixed to the upper end of the second graphite insulation felt layer (9), a top alumina insulation layer (7) is fixed to the upper end of the first graphite insulation felt layer (8), and a through hole opened at the top of the graphite crucible (10) extends upward to communicate with the upper water-cooling flange (4).

4. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 3, characterized in that: The second graphite thermal insulation felt layer (9), the first graphite thermal insulation felt layer (8) and the top alumina thermal insulation layer (7) are all arranged in a disc shape.

5. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 2, characterized in that: The side wall insulation portion comprises an inner graphite insulation felt layer (11) sleeved on the outside of a graphite crucible (10), a boron nitride insulation ring (12) is fixed to the outside of the inner graphite insulation felt layer (11), and an outer graphite insulation felt layer (13) is fixed to the outside of the boron nitride insulation ring (12).

6. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 5, characterized in that: The outer graphite thermal insulation felt layer (13), the inner graphite thermal insulation felt layer (11) and the boron nitride thermal insulation ring (12) are all arranged in a cylindrical shape.

7. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 2, characterized in that: The lower insulation part comprises a third graphite insulation felt layer (14) fixed to the bottom of the graphite crucible (10), a fourth graphite insulation felt layer (15) is fixed to the bottom of the third graphite insulation felt layer (14), a bottom alumina insulation layer (16) is fixed to the bottom of the fourth graphite insulation felt layer (15), and a connection hole opened at the bottom of the graphite crucible (10) extends downward to communicate with the equipment body (1).

8. The high temperature vacuum atmosphere medium frequency induction heating furnace according to claim 7, characterized in that: The third graphite thermal insulation felt layer (14), the fourth graphite thermal insulation felt layer (15) and the bottom alumina thermal insulation layer (16) are all arranged in a disc shape.

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