CN105704852A

CN105704852A - Ultrahigh temperature heat shielding device for vacuum electromagnetic induction heating

Info

Publication number: CN105704852A
Application number: CN201610215357.0A
Authority: CN
Inventors: 罗立平; 张赫; 刘欢
Original assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Current assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2016-06-22
Anticipated expiration: 2036-04-08
Also published as: CN105704852B

Abstract

The invention discloses an ultrahigh temperature heat shielding device for vacuum electromagnetic induction heating, comprising a pedestal, a cylindrical sidewall and a top cover. The pedestal is composed of a pedestal shielding layer I at the top, a pedestal shielding layer II at the middle part and a pedestal shielding layer III at the lower layer through stacking; the sidewall is composed of a sidewall shielding layer I at the inner side, a sidewall shielding layer II at the middle part and a sidewall shielding layer III at the external side through bricking around at intervals; the top cover is composed of a top cover shielding layer I, a top cover shielding layer II, a buffering layer I, a top cover shielding layer III and a buffering layer II fixed through a carbon-carbon bolt from top to bottom; a thermocouple temperature measuring hole is formed in the pedestal; and an infrared temperature measuring hole is formed in the top cover. Structures and materials of the pedestal, the sidewall and the top cover of the ultrahigh temperature heat shielding device for vacuum electromagnetic induction heating are used in ultrahigh temperature, high vacuum and electromagnetic induction heating environment, thus, thermal radiation is shielded effectively, and pollution in the environment is reduced. The ultrahigh temperature heat shielding device for vacuum electromagnetic induction heating provided by the invention is relatively simple in structure and easy to process and maintain.

Description

Vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus

Technical field

The invention belongs to a kind of thermal shield apparatus, be specifically related to a kind of vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus。

Background technology

Sensing in heating process at vacuum electromagnetic, crucible or material are directly heated by the electromagnetic field of alternation, set heating ramp rate, are progressively warming up to required temperature。Under hot environment, heating object knows from experience the substantial amounts of heat radiation of generation, and radiations heat energy size is directly proportional to the biquadratic of heating-up temperature。When the superhigh temperature that heating-up temperature is about 2300 DEG C, if not carrying out heat shielding, the ambient temperature under heat radiation is significantly high, and miscellaneous equipment in vacuum furnace body and stove is brought adverse effect by hot environment。And owing to heat radiation can produce huge energy loss, temperature is difficult to maintain。

When adopting electromagnetic induction heating, owing to the metal type shielding materials conductive performances such as tungsten conventional under high temperature, tantalum, molybdenum are good, can cause directly shielding material autonomous induction being heated, heat shield effect cannot be played, and affect the electromagnetic induction heating effect of material, therefore metal group material can not be adopted as shielding material。In former design, generally adopting resistant to elevated temperatures graphite felt as shielding material, but graphite felt is when higher than 2000 DEG C, saturated vapour pressure is higher, is easier to volatilization, and melting or evaporation material can be produced to pollute by this, therefore better when graphite felt is applied to below 2000 DEG C。To use at higher temperatures, in order to suppress the volatilization of graphite felt, after generally vacuum being evacuated to handkerchief magnitude, pass into the gas such as nitrogen, argon to suppress it to volatilize, it is clear that this does not meet the requirement of fine vacuum, and can bring the negative effect of other side。Chemism such as melting or evaporation material is high, it is possible to can react with the gas passed into, generate other material, affect the purity of material；If application direction is to evaporate material by electromagnetic induction heating, the gas passed into, while suppressing graphite felt volatilization, also can suppress the evaporation of material, affect practical application effect。Therefore graphite felt screen layer is only applicable to the high-temperature heating under vacuum level requirements is not high or inert atmosphere conditions, and the electromagnetic induction heating under high vacuum condition cannot be met。

Therefore, in the urgent need to design a kind of can fine vacuum, about 2300 DEG C superhigh temperature, the thermal shield apparatus of application in electromagnetic induction heating environment。

Summary of the invention

The present invention solves that prior art Problems existing proposes, its objective is to provide a kind of vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus。

The technical scheme is that a kind of vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus, including base, cylindric sidewall and top cover, described base is by top No. I base screen layer, No. II base screen layer at middle part, No. III base screen layer of lower floor is stacking to be formed, and described sidewall is by inner side No. I sidewall screen layer, No. II sidewall screen layer at middle part, No. III sidewall screen layer spacing brick work in outside forms, and described top cover is by No. I top cover screen layer from bottom to top, No. II top cover screen layer, No. I cushion, No. III top cover screen layer, No. II cushion forms by carbon carbon bolt is fixing, forms survey hole of thermocouple, form infrared measurement of temperature hole, No. I described base screen layer in described top cover in described base, No. I sidewall screen layer, No. I top cover screen layer is made up of heavy zirconia brick, No. II described base screen layer, No. II sidewall screen layer, No. II top cover screen layer is made up of Bubble zirconia brick, No. III described base screen layer, No. III sidewall screen layer, No. III top cover screen layer is made up of alumina bubble brick, No. I described cushion, No. II cushion is made up of graphite felt, and described base is additionally provided with the bearing platform being made up of heavy zirconia brick。

No. I described sidewall screen layer is become cylindrical shape by the heavy zirconia brick brick work of tiles。

Described No. I sidewall screen layer, No. II sidewall screen layer are arranged on base, and No. I sidewall screen layer axial height is less than the axial height of No. II sidewall screen layer。

The diameter of No. I described top cover screen layer and the external diameter of No. I sidewall screen layer are consistent。

The base of the present invention, sidewall, cap structure and material use in superhigh temperature, fine vacuum and electromagnetic induction heating environment, improve device serviceability in electromagnetic induction heating, effectively shield heat radiation, and reduce the pollution in environment, present configuration is relatively simple, easily processes maintenance。

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention；

Fig. 2 is present invention vacuum and temperature variations in electromagnetic induction heating process；

Wherein:

1 base 2 sidewall

3 top cover 4 I base screen layers

6 No. III base screen layers of 5 No. II base screen layers

7 bearing platform 8 I sidewall screen layers

10 No. III sidewall screen layers of 9 No. II sidewall screen layers

12 No. II top cover screen layers of 11 No. I top cover screen layers

14 No. III top cover screen layers of 13 No. I cushions

15 No. II cushion 16 survey hole of thermocouple

17 infrared measurement of temperature hole 18 carbon carbon bolts。

Detailed description of the invention

Hereinafter, with reference to drawings and Examples, the present invention is described in detail:

As it is shown in figure 1, a kind of vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus, including base 1, cylindric sidewall 2 and top cover 3, described base 1 is by top No. I base screen layer 4, No. II base screen layer 5 at middle part, No. III base screen layer 6 of lower floor is stacking to be formed, and described sidewall 2 is by inner side No. I sidewall screen layer 8, No. II sidewall screen layer 9 at middle part, No. III sidewall screen layer 10 spacing brick work in outside forms, and described top cover 3 is by No. I top cover screen layer 11 from bottom to top, No. II top cover screen layer 12, No. I cushion 13, No. III top cover screen layer 14, No. II cushion 15 forms by carbon carbon bolt 18 is fixing, forms survey hole of thermocouple 16, form infrared measurement of temperature hole 17, No. I described base screen layer 4 in described top cover 3 in described base 1, No. I sidewall screen layer 8, No. I top cover screen layer 11 is made up of heavy zirconia brick, No. II described base screen layer 5, No. II sidewall screen layer 9, No. II top cover screen layer 12 is made up of Bubble zirconia brick, No. III described base screen layer 6, No. III sidewall screen layer 10, No. III top cover screen layer 14 is made up of alumina bubble brick, No. I described cushion 13, No. II cushion 15 is made up of graphite felt, and described base 1 is additionally provided with the bearing platform 7 being made up of heavy zirconia brick。

No. I described sidewall screen layer 8 is become cylindrical shape by the heavy zirconia brick brick work of tiles。

No. II described sidewall screen layer 9 is become cylindrical shape by the Bubble zirconia brick brick work of tiles。

No. III described sidewall screen layer 10 is become cylindrical shape by the alumina bubble brick brick work of tiles。

Between 8, No. II sidewall screen layer 9 of No. I described sidewall screen layer, the gap value between 9, No. III sidewall screen layer 10 of No. II sidewall screen layer is 5 ~ 10mm。

The thickness of 10, No. I top cover screen layer of 9, No. III sidewall screen layer of 8, No. II sidewall screen layer of 5, No. I sidewall screen layer of 4, No. II base screen layer of No. I described base screen layer, 12, No. III top cover screen layer 14 of 11, No. II top cover screen layer is 20mm, and the thickness of No. III described base screen layer 6 is 40mm。

8, No. II sidewall screen layer 9 of No. I described sidewall screen layer is arranged on base 1, and No. I sidewall screen layer 8 axial height is less than the axial height of No. II sidewall screen layer 9。It is thus possible to be that No. I top cover screen layer 11 reserves installing space。

The diameter of No. I described top cover screen layer 11 and the external diameter of No. I sidewall screen layer 8 are consistent。

The thermocouple arranged in survey hole of thermocouple 16 can the temperature of direct measurement apparatus。

Device can be carried out contactless infrared measurement of temperature by the infrared probe in infrared measurement of temperature hole 17。

As in figure 2 it is shown, controlling heating rate in heating process is 10～15 DEG C/min, when being warming up to 2300 DEG C, constant temperature 1 hour, then turn off heating, furnace cooling。When temperature is room temperature～1450 DEG C, adopting thermocouple temperature measurement, when temperature is higher than 1450 DEG C, adopt colorimetric infrared radiation thermometer to carry out thermometric, in Fig. 2, bold portion is temperature measurement result。Vacuum being monitored in heating process, in Fig. 2, dotted portion is vacuum-degree monitoring result simultaneously。This device is under 2300 DEG C of superhigh temperature and high vacuum condition, and electromagnetic induction heating application is respond well。

Claims

1. a vacuum electromagnetic sensing heating superhigh temperature thermal shield apparatus, including base (1), cylindric sidewall (2) and top cover (3), it is characterised in that: described base (1) is by top No. I base screen layer (4), No. II base screen layer (5) at middle part, No. III base screen layer (6) of lower floor is stacking to be formed, and described sidewall (2) is by inner side No. I sidewall screen layer (8), No. II sidewall screen layer (9) at middle part, No. III sidewall screen layer (10) the spacing brick work in outside forms, and described top cover (3) is by No. I top cover screen layer (11) from bottom to top, No. II top cover screen layer (12), No. I cushion (13), No. III top cover screen layer (14), No. II cushion (15) forms by carbon carbon bolt (18) is fixing, forms survey hole of thermocouple (16), form infrared measurement of temperature hole (17), No. I described base screen layer (4) in described top cover (3) in described base (1), No. I sidewall screen layer (8), No. I top cover screen layer (11) is made up of heavy zirconia brick, No. II described base screen layer (5), No. II sidewall screen layer (9), No. II top cover screen layer (12) is made up of Bubble zirconia brick, No. III described base screen layer (6), No. III sidewall screen layer (10), No. III top cover screen layer (14) is made up of alumina bubble brick, No. I described cushion (13), No. II cushion (15) is made up of graphite felt, and described base (1) is additionally provided with the bearing platform (7) being made up of heavy zirconia brick。

2. vacuum electromagnetic according to claim 1 sensing heating superhigh temperature thermal shield apparatus, it is characterised in that: No. I described sidewall screen layer (8) is become cylindrical shape by the heavy zirconia brick brick work of tiles。

3. vacuum electromagnetic according to claim 1 sensing heating superhigh temperature thermal shield apparatus, it is characterized in that: described No. I sidewall screen layer (8), No. II sidewall screen layer (9) are arranged on base (1), and No. I sidewall screen layer (8) axial height is less than the axial height of No. II sidewall screen layer (9)。

4. vacuum electromagnetic according to claim 1 sensing heating superhigh temperature thermal shield apparatus, it is characterised in that: the diameter of No. I described top cover screen layer (11) and the external diameter of No. I sidewall screen layer (8) are consistent。