CN1146938A

CN1146938A - Method and apparatus for induction heating refractory model element

Info

Publication number: CN1146938A
Application number: CN96109932A
Authority: CN
Inventors: 赖蒙德·布吕克纳; 吕迪格·格劳; 丹尼尔·格林; 史蒂夫·李
Original assignee: Didier Werke AG
Current assignee: Didier Werke AG
Priority date: 1995-07-25
Filing date: 1996-07-22
Publication date: 1997-04-09
Also published as: ATE213678T1; AU6065096A; DE19526967A1; EP0755740A1; KR970005458A; DE59608780D1; ZA966009B; AU725323B2; JPH09122902A; EP0755740B1

Abstract

A method and an apparatus for inductively heating a refractory shaped member (1) provided with an internal space (2), particularly for a metallurgical vessel, enable as rapid, uniform heating of the shaped member (1) as possible. An inner inductor (4) is introduced into the internal space (2), the shaped member (2) is heated from the interior by such inductor, and the inductor (4) then is removed from the internal space (2).

Description

Be used for method and apparatus to the refractory model element eddy-current heating

The present invention relates to the method to the refractory model element eddy-current heating, this model element comprises the inner chamber of a tunnel-shaped.The invention still further relates to the device that is used to implement said method.

This class model spare is parts of metallurgical tank fused solution output device or fused solution input unit especially.Undesirable cooling occurs for fear of the fused solution that therefrom flows through, especially condense, this class model spare is carried out preheating.

A kind of heat-resisting tapping hole that is used for continuous ingot-casting device is disclosed among German patent DE 3,842 690 A1.An induction coil surrounds the tapping passage from the outside, so just side external surface in the eddy-current heating adjustably.Coil is the part of tapping hole member.Like this, because this heat-resisting tapping hole parts are consumable accessorys, so it is highly important that losing quantity is big and expensive.

Normally utilize combustion gas that fire-resistant tapping hole parts are heated.Such shortcoming is, will burnout as the carbon of the part of model element material.In addition, disadvantageously, the temperature distributing disproportionation when heating in the model element is even.For example, observed the temperature difference of about 400K.Just need very long heat time heating time for this reason.

The objective of the invention is to, refractory model element is carried out rapidly and uniform heating.

According to the present invention, utilize this paper to start described that class methods and realize above-mentioned purpose, promptly in the inner chamber of refractory model element, insert an internal induction body, utilize this internal induction body to the model element heating and after heating, it is taken out from inner chamber.

Utilize this method can be rapidly, equably refractory model element is heated, this model element for example is the feed and the distribution system of belt or twin-roll casting machine, therefore makes that the outflow of fused solution can be continual and/or controllable.

Utilize the present invention to avoid condensation problem, thereby utilization rate of equipment and installations is improved.For model element is remained on the predetermined temperature, the heating when this method and apparatus is not only applicable to after-teeming, and be applicable to the heating that is interrupted casting.

The outstanding feature that is used to implement the device of said method is that the internal induction body is made of the induction coil of one or more coolings.

The structure that superiority arranged of the present invention is drawn by dependent claims and following description to embodiment.

Accompanying drawing has represented that this feeding-passage is used for the twin-roll casting machine as the refractory model element of the feeding-passage of the inductor with insertion.

Refractory model element 1 is a kind of feeding-passage of known forms, this model element by pottery, carbonaceous material is made and inductively link to each other with an electric alternating field, adds thermal effect thereby form.This feeding-passage have tunnel-shaped, its cross section is the inner chamber 2 of rectangle, has metal shell 3 in its outer regional area, its structure is just as adopt metal shell usually in described ETA interchanger (ETA-Wechslern).Therefore, metal shell 3 is feeding-passage shielding electromagnetism electric field, thereby makes the feeding-passage can be owing to outside induction coil heats irregular.

In the state shown in the figure, in inner chamber 2, insert an internal induction body 4 with rectangular cross section.The size of this inductor 4, especially its long like this and inner chamber 2 be complementary, promptly it extends on the whole length of inner chamber 2 as much as possible.In addition, its outer geometry also is complementary with the size of inner chamber 2.

Internal induction body 4 comprises the induction coil 5 of many coolings, and these coils link to each other with a generator 6.Inner chamber 2 relative induction bodies 4 with solution ceramics coating 12 for example flexibly and/or heat insulation, refractory model element 1 just can not contact with the part of conduction voltage and/or can not cause hot-spot like this.

In another kind of structure of the present invention, utilize insulator die product 7 to make the surface electrical and/or the heat insulation of the outer surface and the inner chamber 2 of internal induction body 4.

In order to make internal induction body 4 adapt to different geometry or wall thickness intensity, advantageously between internal induction body 4 and surface, the thermal treatment zone, various distances are set.Utilize this method to form different energy densities in model element 1, this will improve the uniformity of heating in different wall thickness intensity.Insulator die product 7 correspondingly is set.

Moulded parts 7 also is used for making internal induction body 4 inner chamber 2 centerings.With suitable frictional force insulator die product 7 being shifted onto on the induction coil 5, is removable thereby make it in the case of necessary.The outer geometry of insulator die product 7 like this and inner chamber 2 be complementary, even it is easy to slip in the inner chamber 2 and be easy to therefrom take out with inductor 4.But this structure also can be such, promptly at first inserts in the insulator die products 7 with insulator die product 7 insertion inner chambers 2 and then with inductor 4.

The top of insulator die product 7 is provided with a flange 8 that is used to limit insertion, and its underpart is an opening.In other structure, for example for the feeding-passage that the side has liquid outlet, insulator die product 7 is sealed with at the bottom of one.

For the upper area 9 that heats the feeding-passage broadening, on flange 8, arrange internal induction body 4 with the form of additional turns 10.

Insulator die product 7 is made by resistant to elevated temperatures ceramic fibre material or ceramic foam material.

Insulator die product 7 is extended on the whole length of internal induction body 4.Also can divide two or more insulator die products that are arranged.

One or more insulator die products (7) must not take out from inner chamber 2.Insulator die product 7 or a plurality of insulator die product can also be made the lining of inner chamber 2.

For fear of the outside radiations heat energy of feeding-passage when heating, promptly lose heat, can external insulation layer 11 be set for it, this external insulation layer is preferably made by ceramic fibre material or ceramic foam material.This will improve to feeding-passage rapidly, equably the heat absorption.

If heat feeding-passage, then push the internal induction body 4 of tape insulation moulded parts 7 in the inner chamber 2 and connect generator 6.Like this, just inductively on the entire cross section of feeding-passage, heat quickly and evenly basically.Just internal induction body 4 is taken out from feeding-passage after temperature required reaching.This just prepares for the casting workpiece performs preheating.This internal induction body 4 can be used for many heating stepses of many feeding-passages.Like this, the possibility of its use is not subjected to the influence of the wearing and tearing of feeding-passage.When insulator die product 7 wearing and tearing, will with its from internal induction body 4 extract out and change one new.Under the different situation of the cross section of feeding-passage, can prepare to have the insulator die product 7 of corresponding different size.Also can not distinguish simultaneously centrally in the inner chamber physical dimension like this internal induction body 4 is inserted.

Claims

1. be used to heat the method for heat-resisting model element, model element comprises a tunnel-shaped inner chamber, this inner chamber has the cross section of substantial rectangular, it is characterized in that, the internal induction body (4) of in inner chamber (2), packing into, utilize this internal induction body (4) to model element (1) heating, then internal induction spare (4) is taken out from inner chamber (2).

2. the method for claim 1 is characterized in that, model element (1) be one be in the Metal Melting liquid bath or on one be used for liquid metals, the fire-resistant feeding-passage of steel especially.

3. method as claimed in claim 2 is characterized in that, model element (1) has a metal shell (3) at least in regional area.

4. be used to implement device, it is characterized in that internal induction body (4) is made of the induction coil (5) of one or more coolings as method as described in one of claim 1 to 3.

5. device as claimed in claim 4 is characterized in that, the size of the inner chamber (2) of the size of internal induction body (4) and refractory model element (1) is complementary.

6. as claim 4 or 5 described devices, it is characterized in that, electricity and/or thermal insulation layer (12) are set between internal induction body (4) and inner chamber (2).

7. as the described device of one of claim 4 to 6, it is characterized in that the distance adjustment that internal induction body (4) is desired the area heated surface apart from refractory model element (1) becomes can transmit different energy fluences.

8. as the described device of one of claim 4 to 7, it is characterized in that, use the insulator die product of making by electricity and/or heat insulator (7) to form described centering/spacing.

10. as the described device of one of claim 7 to 9, it is characterized in that insulator die product (7) is made by height heat-resisting ceramic fibre material or ceramic foam material.

11., it is characterized in that insulator die product (7) can be passed on the internal induction body (4) as the described device of one of claim 8 to 10.

12., it is characterized in that the insulator die product (7) on the internal induction body (4) can be changed as the described device of one of claim 8 to 11.

13. as the described device of one of claim 4 to 12, it is characterized in that, insulator die product (7) and refractory model element (1) or internal induction spare (4) the heating after be easy to separated.

14., it is characterized in that insulator die product (7) is arranged to local lining at least as the described device of one of claim 8 to 12 in the inner chamber (2) of model element (1).

15. device as claimed in claim 14 is characterized in that, the insulator die product comes off after heating.

16., it is characterized in that model element (1) comprises an external insulation layer (11) as the described device of one of claim 3 to 15, this external insulation is preferably made by ceramic fibre material or ceramic foam material.