Induction furnace kit, induction furnace, and induction furnace construction method

Abstract

To provide an induction furnace kit where penetration of metal hardly occurs between a hot water tapping port gutter and a sleeve, to provide an induction furnace, and to provide an induction furnace construction method.SOLUTION: An induction furnace kit 1 includes a sleeve 2, a hot water tapping port gutter 5, and a filler 6. A cutout part 21 is formed at the sleeve 2, and it comprises a cutout part bottom part 25 and a cutout part side part. At the hot water tapping port gutter 5, a hanging part 51 is formed, and it comprises a hanging part lower end part 55 and a hanging part side part. The cutout part bottom part 25 opposes to the hanging part lower end part 55, and the cutout part side part opposes to the hanging part side part. A boundary between the cutout part bottom part 25 and the hanging part lower end part 55, and a boundary between the cutout part side part and the hanging part side part oppose to a furnace body sandwiching an internal space in the radial direction, and the kneaded filler 6 can be filled in each boundary. In the kneaded filler 6 and the sleeve 2, the range of a difference of the linear thermal expansion rate at the temperature of 1500°C is equal to or less than 1.5%.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an induction furnace kit for construction on the furnace body of an induction furnace, an induction furnace constructed, and an induction furnace construction method.

Background Art

[0002] Conventionally, a tapping port precast body that constitutes the tapping port of an induction furnace, and an induction furnace provided with the same have been proposed. For example, according to Patent Document 1, it is a tapping port precast body made of an inorganic fired body that is attached to the peripheral edge of the opening at the upper part of the furnace body of the induction furnace to provide a tapping port, and has a vertical wall portion having a front portion that provides a part of the inner wall surface of the furnace body facing forward, a protruding gutter portion that protrudes rearward from the vertical wall portion and has a gutter-shaped passage at the upper part, and a rising portion that continuously connects the front portion and the inner surface of the gutter-shaped passage.

[0003] According to such an invention, it is described that a large thermal shock during tapping can be received over a wide area, and the load at the connection portion from the inner wall surface of the furnace body to the gutter-shaped passage of the tapping port can be reduced, so that a tapping port excellent in durability for an induction furnace can be provided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, there are the following problems in the conventional examples. According to the description in Patent Document 1, the furnace body includes a pedestal formed by fixing refractory bricks to the furnace body, and a tapping port precast body is placed on the pedestal so as to extend a vertical wall portion above the refractory bricks. The tapping port precast body is described as being fixed by fixed refractory bricks arranged side by side on the left and right thereof and unshaped refractories constructed at the joints. There is a problem that the area between the pedestal and the tapping port precast is easily subjected to thermal shock by molten metal, and a metal insertion is likely to occur in the unshaped refractory constructed therebetween. Then, there is a problem that the furnace body is damaged.

[0006] An object of the present invention is to provide an induction furnace kit, an induction furnace, and an induction furnace construction method in which metal insertion is less likely to occur between a tapping port trough and a sleeve.

Means for Solving the Problems

[0007] The kit for an induction furnace according to the first aspect of the present invention is a kit that can be installed on the furnace body of a cylindrical induction furnace, and includes a cylindrical sleeve made of a shaped material centered on a central axis, a tapping spout that can be installed on the furnace top of the furnace body, and a filling material. The direction of the central axis is the vertical direction with the side of the furnace top in the furnace body being the upper side and the bottom side being the lower side. A notch is formed at the top of the sleeve. The notch includes a notch bottom that is the lower end and a notch side that is the side wall of the sleeve in the circumferential direction with respect to the central axis. The tapping spout has a drooping portion formed on the side opposite to the spout tip. The drooping portion includes a drooping portion lower end and a drooping portion side that is the circumferential end with respect to the central axis. The drooping portion can be installed in the notch of the sleeve, and when installed in the notch, the inner peripheral surface of the drooping portion is formed to be continuous with the inner peripheral surface of the sleeve. When the sleeve and the tapping spout are installed on the furnace body, in the vertical direction, the notch bottom and the drooping portion lower end face each other, and in the circumferential direction with respect to the central axis, the notch side and the drooping portion side face each other, and an internal space surrounded by the tapping spout, the sleeve, and the furnace body is formed. The boundary between the notch bottom and the drooping portion lower end faces the furnace body across the internal space in the radial direction with respect to the central axis. The filling material can be kneaded with an aqueous sodium silicate solution, and the kneaded filling material can fill the space between the notch bottom and the drooping portion lower end and the space between the notch side and the drooping portion side. The difference in the linear thermal expansion rate at 1500 °C between the kneaded filling material and the sleeve is in the range of 1.5% or less.

[0008] According to this, when the sleeve and the tapping spout are installed on the furnace body, in the vertical direction, the notch bottom and the drooping portion lower end face each other, and in the circumferential direction, the notch side and the drooping portion side face each other, and it is possible to fill the kneaded filling material therebetween. Since the difference in the linear thermal expansion rate at 1500 °C between the kneaded filling material and the sleeve is in the range of 1.5% or less, cracks and the like due to the difference in expansion rate can be suppressed when receiving a thermal shock from molten metal, and the occurrence of ingot insertion can be reduced.

[0009] In addition, the boundary between the bottom of the notch and the lower end of the hanging part faces the furnace body across the internal space in the radial direction with respect to the central axis. Therefore, since the internal space can be filled with the monolithic material or the kneaded filler, even if cracks or the like occur between the bottom of the notch and the lower end of the hanging part and a metal intrusion occurs, the progress of the metal intrusion can be stopped with the monolithic material or the like before reaching the furnace body.

[0010] Further, in the induction furnace kit, the difference in the linear thermal expansion coefficient at 1500 °C between the kneaded filler and the tapping spout may be in the range of 1.5% or less.

[0011] In this case, since the difference in the linear thermal expansion coefficient at 1500 °C between the kneaded filler and the tapping spout is in the range of 1.5% or less, cracks or the like due to the difference in the expansion coefficient can be suppressed when receiving a thermal shock from the molten metal, and the metal intrusion can be reduced.

[0012] Further, the induction furnace kit includes a monolithic material capable of forming a backing material around the sleeve, the internal space can be filled with the monolithic material and / or the kneaded filler, and the boundary between the bottom of the notch and the lower end of the hanging part may face the backing material or the filler in the radial direction with respect to the central axis.

[0013] In this case, when the sleeve and the tapping spout are installed in the furnace body, the boundary between the bottom of the notch and the lower end of the hanging part can face the backing material or the filler in the radial direction with respect to the central axis. Therefore, even if cracks or the like occur between the bottom of the notch and the lower end of the hanging part, the progress of the metal intrusion can be suppressed by the backing material or the kneaded filler.

[0014] The kit for an induction furnace according to the second aspect of the present invention is a kit that can be installed on the furnace body of a cylindrical induction furnace, and includes a cylindrical sleeve made of a shaped material centered on a central axis, and a tapping spout that can be installed on the furnace top of the furnace body. The direction of the central axis is the vertical direction with the side of the furnace top in the furnace body as the upper side and the bottom side as the lower side. A notch is formed at the top of the sleeve. The notch includes a notch bottom that is the lower end and a notch side that is the side wall of the sleeve in the circumferential direction with respect to the central axis. The tapping spout has a hanging part formed on the side opposite to the spout tip. The hanging part includes a hanging part lower end and a hanging part side that is the circumferential end with respect to the central axis. The hanging part can be installed in the notch of the sleeve, and when installed in the notch, the inner peripheral surface of the hanging part is formed to be continuous with the inner peripheral surface of the sleeve. When the sleeve and the tapping spout are installed on the furnace body, in the vertical direction, the notch bottom and the hanging part lower end face each other, and in the circumferential direction with respect to the central axis, the notch side and the hanging part side face each other, and an internal space surrounded by the tapping spout, the sleeve, and the furnace body is formed. The boundary between the notch bottom and the hanging part lower end faces the furnace body across the internal space in the radial direction with respect to the central axis, and at least one of the notch bottom and the hanging part lower end is formed with a convex part and / or a concave part along the vertical direction.

[0015] According to this, when the sleeve and the tapping spout are installed on the furnace body, in the vertical direction, the notch bottom and the hanging part lower end face each other. Further, in the vertical direction, convex parts and / or concave parts are respectively formed on the notch bottom and the hanging part lower end that face each other. When a filler kneaded between the notch bottom and the hanging part lower end is filled, the outflow is reduced by the convex parts and / or the concave parts. Therefore, cracks and the like generated by the thermal shock of the molten metal can be suppressed between the notch bottom and the hanging part lower end, and the ingot casting can be reduced.

[0016] Further, in the induction furnace kit, a hanging portion convex portion is formed at the lower end of the hanging portion, a notch convex portion is formed at the bottom of the notch portion, and when the tapping trough is installed on the sleeve, the notch convex portion and the hanging portion convex portion may face each other in the radial direction with respect to the central axis.

[0017] In this case, when the hanging portion is installed in the notch portion, the notch convex portion and the hanging portion convex portion face each other in the radial direction with respect to the central axis, so that when the more kneaded filler is filled, the outflow is suppressed. Therefore, cracks and the like generated by the thermal shock of the molten metal can be suppressed, and the ingot difference can be reduced.

[0018] Further, in the induction furnace kit, the difference in the linear thermal expansion rate between the sleeve and the tapping trough at 1500 °C may be in the range of 1.5% or less.

[0019] In this case, since the difference in the linear thermal expansion rate between the sleeve and the tapping trough at 1500 °C is in the range of 1.5% or less, cracks and the like due to the difference in the expansion rate when receiving the thermal shock of the molten metal can be suppressed between the bottom of the notch portion and the lower end of the hanging portion, and the ingot difference can be reduced.

[0020] Further, the induction furnace kit includes a refractory material capable of forming a backing material around the sleeve and a filler. The filler can be kneaded with an aqueous sodium silicate solution, and the kneaded filler can fill the space between the bottom of the notch portion and the lower end of the hanging portion and between the side portion of the notch portion and the side portion of the hanging portion. The internal space can be filled with the refractory material and / or the kneaded filler, and the boundary between the bottom of the notch portion and the lower end of the hanging portion may face the backing material or the filler in the radial direction with respect to the central axis.

[0021] In this case, when the sleeve and the hot water outlet pipe are installed on the furnace body, the boundary between the bottom of the notch and the lower end of the hanging part can face the backing material or the kneaded filling material in the radial direction with respect to the central axis. Therefore, even if cracks or the like occur between the bottom of the notch and the lower end of the hanging part, the progress of the metal insert can be suppressed by the backing material or the kneaded filling material.

[0022] Further, in the case where a coil block including an induction coil is formed on the furnace body in the induction furnace kit, when the sleeve and the hot water outlet pipe are installed on the furnace body, the bottom of the notch may be located above the upper end of the coil block in the vertical direction.

[0023] In this case, when the sleeve and the hot water outlet pipe are installed on the furnace body, the bottom of the notch is located above the upper end of the coil block. Therefore, when a metal insert occurs due to a thermal shock by molten metal between the bottom of the notch and the lower end of the hanging part, even if the metal insert progresses, the direct impact on the coil block is reduced, so that damage to the furnace body can be suppressed.

[0024] The induction furnace according to the third aspect of the present invention is an induction furnace constructed by the induction furnace kit, in which the backing material is formed between the sleeve and the furnace body in the radial direction with respect to the central axis, the hanging part is installed in the notch, the inner peripheral surface of the hanging part is continuous with the inner peripheral surface of the sleeve, faces the sleeve through the kneaded filling material in the vertical direction, the boundary between the bottom of the notch and the lower end of the hanging part faces the furnace body across the internal space in the radial direction with respect to the central axis, the internal space is in a state where the backing material is formed or / and filled with the kneaded filling material, and the space between the bottom of the notch and the lower end of the hanging part and the space between the side part of the notch and the side part of the hanging part are in a state filled with the kneaded filling material.

[0025] According to this, in the induction furnace, the boundary between the bottom of the notch and the lower end of the hanging part faces the backing material and / or the kneaded filler in the radial direction with respect to the central axis. Therefore, even if a metal pouring occurs between the sleeve and the tapping spout due to the molten metal, the progress is suppressed by the backing material and / or the kneaded filler, and it is possible to suppress the extension of the metal pouring.

[0026] The method for constructing an induction furnace according to the fourth aspect of the present invention is a method for constructing an induction furnace using the induction furnace kit, including a step of kneading the filler with an aqueous sodium silicate solution, a step of installing the sleeve on the inner peripheral portion of the furnace body, a step of applying the filler to each predetermined portion of the tapping spout and the sleeve, a step of installing the tapping spout such that the inner peripheral surface of the hanging part is continuous with the inner peripheral surface of the sleeve along the vertical direction at the notch of the sleeve, and a step of forming the backing material by pouring the amorphous material between the furnace body and the sleeve. The hanging part faces the sleeve through the kneaded filler in the vertical direction, the boundary between the bottom of the notch and the lower end of the hanging part faces the furnace body across the internal space in the radial direction with respect to the central axis, the internal space is filled with the backing material and / or the kneaded filler, and the space between the bottom of the notch and the lower end of the hanging part and the space between the side of the notch and the side of the hanging part are filled with the kneaded filler.

[0027] According to this, the induction furnace construction method is constructed on the furnace body using the induction furnace kit, and the boundary between the bottom of the notch and the lower end of the hanging part faces the furnace body through the backing material and / or the kneaded filler in the radial direction with respect to the central axis. Even if a metal pouring occurs between the sleeve and the tapping spout due to the molten metal, the progress is suppressed by the backing material and / or the kneaded filler, and it is possible to suppress the extension of the metal pouring.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

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Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Embodiments for Carrying Out the Invention

[0029] Hereinafter, with reference to the drawings, the induction furnace kit 1, the induction furnace 30, and the induction furnace construction method embodying the present invention will be described. Note that the embodiments for carrying out the invention and the drawings referred to are used to explain the technical features that the present invention can adopt. The present invention is not limited to these. The configurations described in the drawings are not intended to be limited thereto, but are merely illustrative examples.

[0030] <Induction Furnace Kit 1 According to the First Aspect> The kit 1 for an induction furnace according to the first aspect of the present invention will be described. The description will be made with reference to FIGS. 1 to 8, FIGS. 17, and FIGS. 19 to 21. The kit 1a for an induction furnace according to the first embodiment described later will be described as an example. As shown in FIGS. 1 to 3, the kit 1 for an induction furnace is a kit that can be installed on the furnace body 3 of the cylindrical induction furnace 30, and includes a cylindrical sleeve 2 made of a shaped material centered on the central axis C1, a tapping spout 5 that can be installed on the furnace top of the furnace body 3, and a filling material 6. The direction of the central axis C1 is the vertical direction with the side of the furnace top in the furnace body 3 being the upper side and the bottom side being the lower side.

[0031] As shown in FIG. 8, a notch 21 is formed at the top of the sleeve 2. The notch 21 includes a notch bottom 25 that is the lower end and a notch side 26 that is the side wall of the sleeve 2 in the circumferential direction with respect to the central axis C1. A hanging portion 51 is formed on the tapping spout 5 on the side opposite to the spout tip 59. The hanging portion 51 includes a hanging portion lower end 55 and a hanging portion side 56 that is the circumferential end with respect to the central axis C1.

[0032] As shown in FIG. 8 and the like, the hanging portion 51 can be installed in the notch 21 of the sleeve 2, and when installed in the notch 21, the hanging portion inner peripheral surface 52 is formed to be continuous with the sleeve inner peripheral surface 22. As shown in FIG. 2 and the like, when the sleeve 2 and the tapping spout 5 are installed on the furnace body 3, in the vertical direction, the notch bottom 25 and the hanging portion lower end 55 face each other, and in the circumferential direction, the notch side 26 and the hanging portion side 56 face each other.

[0033] Figure 17 shows a state where the back material 4 and the filling material 6, which will be described later, are not filled. An internal space 58 is formed by the hot water outlet gutter 5, the sleeve 2, and the furnace body 3. The boundary between the bottom 25 of the notch and the lower end 55 of the hanging part faces the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. Further, the boundary between the side part 26 of the notch and the side part 56 of the hanging part may face the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. In particular, among the boundaries between the side part 26 of the notch and the side part 56 of the hanging part, at least the positions adjacent to the bottom 25 of the notch and the lower end 55 of the hanging part may face the furnace body 3 across the internal space 58. Although Figure 17 shows the internal space 58 taking Figure 4(a) as an example, the internal space 58 is similarly formed in other embodiments.

[0034] Here, the furnace body 3 includes, for example, a coil block 7 incorporating an induction coil 8, a coil retainer 13, a yoke 17, and an iron skin 10. That the boundary between the bottom 25 of the notch and the lower end 55 of the hanging part faces across the internal space 58 means facing any of the coil block 7, the coil retainer 13, the yoke 17, and the iron skin 10. In the example shown in Figure 17, the boundary between the side part 26 of the notch and the side part 56 of the hanging part faces the coil retainer 13 across the internal space 58.

[0035] The filling material 6 can be kneaded with an aqueous sodium silicate solution. The filling material 6 is in powder form at the time of factory shipment etc., and is kneaded with an aqueous sodium silicate solution at the construction site etc. and used as a kneaded material. The kneaded filling material 6 can fill the space between the bottom 25 of the notch and the lower end 55 of the hanging part and the space between the side part 26 of the notch and the side part 56 of the hanging part. The difference in the linear thermal expansion rate between the kneaded filling material 6 and the sleeve 2 at 1500°C is in the range of 1.5% or less. Further, it is more desirable that the difference in the linear thermal expansion rate between the kneaded filling material 6 and the sleeve 2 at 1500°C is in the range of 0.5% or less. Although details will be described later, Examples 1 to 9 and Comparative Examples from Figure 19 to Figure 21 are combinations of the filling material 6 and the sleeve 2 used in the present invention. In Examples 1 to 9, the difference in the linear thermal expansion rate between the kneaded filling material 6 and the sleeve 2 at 1500°C is in the range of 0.5% or less.

[0036] Further, the kneaded filler 6 and the hot water outlet pipe 5 may have a difference in linear thermal expansion coefficient at 1500 °C within a range of 1.5% or less. Although details will be described later, Examples 1 to 9 in FIGS. 19 and 20 are combinations of the filler 6 and the hot water outlet pipe 5 used in the present invention. In Examples 1 to 9, the kneaded filler 6 and the hot water outlet pipe 5 have a difference in linear thermal expansion coefficient at 1500 °C within a range of 1.5% or less.

[0037] Also, as shown in FIGS. 4 to 7, the induction furnace kit 1 may include the amorphous material 14 capable of forming the backing material 4 around the sleeve 2. The internal space 58 shown in FIG. 17 may be filled with the amorphous material 14 and / or the kneaded filler 6 as shown in FIGS. 4 and the like. The boundary between the bottom 25 of the notch and the lower end 55 of the hanging part may be opposed to the backing material 4 or the kneaded filler 6 in the radial direction with respect to the central axis C1.

[0038] Furthermore, as shown in FIGS. 2 and the like, among the boundaries between the side part 26 of the notch and the side part 56 of the hanging part, at least at positions adjacent to the bottom 25 of the notch and the lower end 55 of the hanging part in the vertical direction, it may be opposed to the backing material 4 or the kneaded filler 6.

[0039] Also, as shown in FIGS. 4 and the like, when the coil block 7 including the induction coil 8 is formed in the furnace body 3, when the sleeve 2 and the hot water outlet pipe 5 are installed in the furnace body 3, the bottom 25 of the notch may be located above the upper end of the coil block 7 in the vertical direction.

[0040] With reference to FIGS. 4 to 7, the state when the sleeve 2 and the hot water outlet pipe 5 are installed in the furnace body 3 will be described. FIGS. 4 and 5 show the case where the bottom 25 of the notch is located above the upper end of the coil block 7 in the vertical direction. That is, the virtual line 57 intersects the backing material 4 or the kneaded filler 6 and the coil retainer 13 or the iron skin 10. The examples shown in FIGS. 4 and 5 are such that the upper end positions of the coil block 7 and the gusset 17 coincide in the furnace body 3, and the coil retainer 13 is installed above the coil block 7.

[0041] In the example shown in FIG. 4(a), there is no gap between the coil retainer 13 and the hot water outlet pipe 5a, and a back material 4 is formed between the coil retainer 13 and the coil block 7, and between the hanging portion 51a and the sleeve 2a. The space between the bottom 25 of the notch and the lower end 55 of the hanging portion is filled with the kneaded filler 6. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion faces the back material 4 in the radial direction with respect to the central axis C1, and further faces the coil retainer 13 through the back material 4. In the example shown in FIG. 4(b), there is a gap or space between the upper part of the coil retainer 13 and the hot water outlet pipe 5 compared to FIG. 4(a), and the amorphous material 14 is filled to form the back material 4. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion faces the back material 4 in the radial direction with respect to the central axis C1, and further faces the iron sheet 10 through the back material 4.

[0042] In the example shown in FIG. 5(a), there is no gap between the coil retainer 13 and the hot water outlet pipe 5, and the back material 4 is formed between the coil retainer 13 and the coil block 7, and between the hanging portion 51 and the sleeve 2 up to the position where it coincides with the bottom 25 of the notch of the sleeve 2. The upper side of the bottom 25 of the notch is filled with the kneaded filler 6. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion faces the kneaded filler 6 in the radial direction with respect to the central axis C1, and further faces the coil retainer 13 through the kneaded filler 6. In the example shown in FIG. 5(b), there is a gap or space between the upper part of the coil retainer 13 and the hot water outlet pipe 5 compared to FIG. 5(a), and the kneaded filler 6 is filled. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion faces the kneaded filler 6 in the radial direction with respect to the central axis C1, and further faces the iron sheet 10 through the kneaded filler 6.

[0043] Next, with reference to FIGS. 6 and 7, a case where the bottom 25 of the notch portion is located below the upper end portion of the coil block 7 will be described. In the example shown in FIG. 6(a), there is no gap between the coil retainer 13 and the hot water outlet pipe 5, and a back material 4 is formed between the coil retainer 13 and the coil block 7, and between the drooping portion 51 and the sleeve 2. The space between the bottom 25 of the notch portion and the lower end portion 55 of the drooping portion is filled with the kneaded filler 6. In this case, the boundary between the bottom 25 of the notch portion and the lower end portion 55 of the drooping portion faces the back material 4 in the radial direction with respect to the central axis C1, and further, a part thereof faces the coil block 7 through the back material 4. In the example shown in FIG. 6(b), there is a gap or space between the upper part of the coil retainer 13 and the hot water outlet pipe 5 compared to FIG. 6(a), and the back material 4 is formed by filling the amorphous material 14. In this case, the boundary between the bottom 25 of the notch portion and the lower end portion 55 of the drooping portion faces the back material 4 in the radial direction with respect to the central axis C1, and further, a part thereof faces the coil block 7 through the back material 4. Also, when the coil retainer 13 is thinner in the vertical direction than the state shown in the figure and the upper end of the coil block 7 is on the lower side, the boundary between the bottom 25 of the notch portion and the lower end portion 55 of the drooping portion faces the iron sheet 10 through the back material 4.

[0044] In the example shown in Fig. 7(a), there is no gap between the coil retainer 13 and the hot water outlet pipe 5, and the back material 4 is formed between the coil retainer 13 and the coil block 7 and between the drooping portion 51 and the sleeve 2 up to the position where it coincides with the bottom 25 of the notch of the sleeve 2. Above the bottom 25 of the notch, it is filled with the kneaded filler 6. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the drooping portion faces the kneaded filler 6 in the radial direction with respect to the central axis C1, and further faces the coil block 7 through the kneaded filler 6. In the example shown in Fig. 7(b), there is a gap or space between the upper part of the coil retainer 13 and the hot water outlet pipe 5 compared to Fig. 7(a), and it is filled with the kneaded filler 6. In this case, the boundary between the bottom 25 of the notch and the lower end 55 of the drooping portion faces the kneaded filler 6 in the radial direction with respect to the central axis C1, and further faces the coil block 7 through the kneaded filler 6. Also, when the coil retainer 13 is thinner in the vertical direction than the illustrated state and the upper end of the coil block 7 is on the lower side, the boundary between the bottom 25 of the notch and the lower end 55 of the drooping portion faces the iron sheet 10 through the kneaded filler 6.

[0045] The content described with reference to Figs. 4 to 7 is the same for the induction furnace kit 1 according to the second aspect described later.

[0046] The configuration described above with the induction furnace kit 1 according to the first aspect is common to all of the induction furnace kits 1a to 1g of the first to seventh embodiments described later.

[0047] <Effects of the induction furnace kit 1 according to the first aspect> The kit 1 for an induction furnace according to the first aspect of the present invention described above has the following effects. As shown in FIG. 4 and the like, when the sleeve 2 and the tapping spout 5 are installed in the furnace body 3, in the vertical direction, the bottom 25 of the notch portion and the lower end 55 of the hanging portion face each other, and in the circumferential direction, the side portion 26 of the notch portion and the side portion 56 of the hanging portion face each other, and it is possible to fill the kneaded filler 6 therebetween. As shown in FIGS. 20 and 21, the difference in the linear thermal expansion coefficient between the kneaded filler 6 and the sleeve 2 at 1500 ° C. is in the range of 1.5% or less. Therefore, the kit 1 for an induction furnace can suppress cracks and the like due to the difference in the expansion coefficient between the kneaded filler 6 and the sleeve 2 when receiving a thermal shock from the molten metal, and can reduce the occurrence of metal sticking. Furthermore, if the difference in the linear thermal expansion coefficient between the kneaded filler 6 and the sleeve 2 at 1500 ° C. is in the range of 0.5% or less, since the expansion coefficients are closer, cracks and the like can be suppressed, and the occurrence of metal sticking can be reduced.

[0048] If a crack occurs between the sleeve 2 and the kneaded filler 6 and metal sticking occurs, the metal sticking may extend along the sleeve 2. Then, the sleeve 2 may be damaged. On the other hand, if the metal sticking occurring between the sleeve 2 and the kneaded filler 6 can be reduced, the life of the sleeve 2 can be extended.

[0049] Also, as shown in FIG. 17, the boundary between the bottom 25 of the notch portion and the lower end 55 of the hanging portion faces the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. As shown in FIG. 4 and the like, since the internal space 58 can be filled with the amorphous material 14 or the kneaded filler 6, even if a crack occurs at the boundary between the notch portion 21 and the hanging portion 51 and metal sticking occurs, the progress of the metal sticking can be stopped by the back material 4 or the kneaded filler 6 before reaching the furnace body 3.

[0050] Further, as shown in FIGS. 19 and 20, the difference in linear thermal expansion coefficient between the kneaded filler 6 and the hot water outlet pipe 5 at 1500 ° C. may be in the range of 1.5%. In this case, between the kneaded filler 6 and the hot water outlet pipe 5, when receiving a thermal shock from the molten metal, cracks and the like due to the difference in expansion rate can be suppressed, and the metal sticking can be reduced.

[0051] Also, as shown in FIG. 4 and the like, when the sleeve 2 and the hot water outlet pipe 5 are installed in the furnace body 3, the bottom 25 of the notch and the lower end 55 of the hanging part may be opposed to the backing material 4 or the kneaded filler 6 in the radial direction with respect to the central axis C1. In this case, even if cracks or the like occur between the bottom 25 of the notch and the lower end 55 of the hanging part, the progress of metal sticking can be suppressed by the backing material 4 or the kneaded filler 6.

[0052] Furthermore, as shown in FIG. 2 and the like, among the boundaries between the side part 26 of the notch and the side part 56 of the hanging part, at least at positions adjacent to the bottom 25 of the notch and the lower end 55 of the hanging part in the vertical direction, if it is possible to be opposed to the backing material 4 or the kneaded filler 6, the progress of metal sticking can be further suppressed. This is because when the molten metal is discharged from the hot water outlet pipe 5, the molten metal gathers at the pipe part 60 shown in FIG. 8 and the like, so the periphery of the bottom 25 of the notch is likely to receive a thermal shock. In addition, in the side part 26 of the notch, the part closer to the bottom 25 of the notch is more likely to receive a thermal shock.

[0053] Also, as shown in FIG. 4 and the like, when the sleeve 2 and the hot water outlet pipe 5 are installed in the furnace body 3, the bottom 25 of the notch may be located above the upper end of the coil block 7. At this time, at the boundary between the bottom 25 of the notch and the lower end 55 of the hanging part, if a metal sticking occurs due to a thermal shock from the molten metal, even if the metal sticking progresses, the coil block 7 is less likely to be directly impacted, so damage to the furnace body 3 and the like can be suppressed. Note that this effect is the same for the induction furnace kit 1 according to the second aspect described later.

[0054] <The induction furnace kit 1 according to the second aspect> Next, the kit 1 for an induction furnace according to the second aspect of the present invention will be described with reference to FIGS. 9 to 17. The kit 1 for an induction furnace according to the second aspect includes the kit 1b for an induction furnace of the second embodiment to the kit 1g for an induction furnace of the seventh embodiment, which will be described later. The kit 1 for an induction furnace is a kit that can be installed on the furnace body 3 of the cylindrical induction furnace 30, and includes a cylindrical sleeve 2 made of a shaped material centered on the central axis C1 and a tapping spout 5 that can be installed on the furnace top of the furnace body 3. The direction of the central axis C1 is the vertical direction with the side of the furnace top in the furnace body 3 as the upper side and the bottom side as the lower side.

[0055] As shown in FIG. 12 and the like, a notch 21 is formed at the top of the sleeve 2. The notch 21 includes a notch bottom 25 that is the lower end and a notch side 26 that is the side wall of the sleeve 2 in the circumferential direction with respect to the central axis C1. The tapping spout 5 has a hanging portion 51 formed on the side opposite to the spout tip 59. The hanging portion 51 includes a hanging portion lower end 55 and a hanging portion side 56 that is the circumferential end with respect to the central axis C1. The hanging portion 51 can be installed in the notch 21 of the sleeve 2, and when installed in the notch 21, the hanging portion inner peripheral surface 52 is formed to be continuous with the sleeve inner peripheral surface 22.

[0056] As shown in FIG. 9 and the like, when the sleeve 2 and the tapping spout 5 are installed on the furnace body 3, in the vertical direction, the notch bottom 25 and the hanging portion lower end 55 face each other, and in the circumferential direction, the notch side 26 and the hanging portion side 56 face each other. As shown in FIG. 17, an internal space 58 surrounded by the tapping spout 5, the sleeve 2, and the furnace body 3 is formed. The boundary between the notch bottom 25 and the hanging portion lower end 55 faces the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1.

[0057] Furthermore, the boundary between the side portion 26 of the notch and the side portion 56 of the hanging portion may face the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. In particular, at least at positions adjacent to the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion among the boundaries between the side portion 26 of the notch and the side portion 56 of the hanging portion, it may face the furnace body 3 across the internal space 58. Here, the fact that the furnace body 3 includes the coil block 7 incorporating the induction coil 8, the coil retainer 13, the yoke 17, and the iron skin 10 is the same as that of the induction furnace kit 1 according to the first aspect.

[0058] As shown in FIG. 12 and the like, at least one of the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion is formed with a convex portion and / or a concave portion along the vertical direction. The detailed configuration will be described in each of the embodiments described later. Although not shown, a convex portion and / or a concave portion may be further formed in at least one of the side portion 26 of the notch and the side portion 56 of the hanging portion in the vertical direction.

[0059] Also, as shown in FIGS. 11 to 13, a hanging portion convex portion 53 may be formed at the lower end portion 55 of the hanging portion, and a notch convex portion 23 may be formed at the bottom portion 25 of the notch. When the hanging portion 51 of the hot water outlet pipe 5 is installed in the notch 21 of the sleeve 2, the notch convex portion 23 and the hanging portion convex portion 53 may face each other in the radial direction with respect to the central axis C1. This example corresponds to the induction furnace kit 1d according to the fourth embodiment and the induction furnace kit 1e according to the fifth embodiment described later.

[0060] Also, the difference in the linear thermal expansion rate between the sleeve 2 and the hot water outlet pipe 5 at 1500°C may be in the range of 1.5% or less. Although details will be described later, Examples 1 to 9 in FIGS. 20 and 21 are combinations of the sleeve 2 and the hot water outlet pipe 5 used in the present invention. In Examples 1 to 9, the difference in the linear thermal expansion rate between the sleeve 2 and the hot water outlet pipe 5 is in the range of 1.5% or less.

[0061] In the induction furnace kit 1 according to the second aspect as well, similar to the first aspect, it is desirable that the difference in linear thermal expansion coefficient between the kneaded filler 6 and the sleeve 2 at 1500°C is in the range of 1.5% or less. Further, it is more desirable that the difference in linear thermal expansion coefficient between the kneaded filler 6 and the sleeve 2 at 1500°C is in the range of 0.5% or less. Also, it is desirable that the difference in linear thermal expansion coefficient between the kneaded filler 6 and the tapping spout 5 at 1500°C is in the range of 1.5% or less.

[0062] Also, as shown in FIG. 9 and the like, the induction furnace kit 1 may include an amorphous material 14 capable of forming a backing material 4 around the sleeve 2 and a filler 6. The filler 6 can be kneaded with an aqueous sodium silicate solution. The kneaded filler 6 can fill the space between the bottom 25 of the notch and the lower end 55 of the hanging portion, and between the side 26 of the notch and the side 56 of the hanging portion. The internal space 58 shown in FIG. 17 can be filled with the amorphous material 14 and / or the kneaded filler 6 as shown in FIG. 9 and the like. The boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion may face the backing material 4 or the kneaded filler 6 in the radial direction with respect to the central axis C1.

[0063] <Effect of the induction furnace kit 1 according to the second aspect> The induction furnace kit 1 according to the second aspect of the present invention described above has the following effects. As shown from FIG. 9 to FIG. 17, when the sleeve 2 and the tapping spout 5 of the induction furnace kit 1 are installed in the furnace body 3, in the vertical direction, the bottom 25 of the notch and the lower end 55 of the hanging portion face each other. Protrusions and / or recesses are formed on the bottom 25 of the notch and the lower end 55 of the hanging portion, respectively. When the kneaded filler 6 is filled between the bottom 25 of the notch and the lower end 55 of the hanging portion, the outflow of the kneaded filler 6 is reduced by the protrusions and / or recesses. Therefore, cracks and the like generated by the thermal shock of the molten metal can be suppressed between the bottom 25 of the notch and the lower end 55 of the hanging portion, and the ingot casting can be reduced.

[0064] In addition, although not shown in the figures, if convex portions and / or concave portions are formed in at least one of the side portions 26 of the notch portion and the side portions 56 of the hanging portion in the vertical direction, cracks and the like generated by thermal shock caused by molten metal can be suppressed even between the side portions 26 of the notch portion and the side portions 56 of the hanging portion, and the metal sticking can be reduced.

[0065] Furthermore, similar to the induction furnace kit 1 according to the first aspect, if it is possible to face the backing material 4 or the kneaded filler 6 at least at positions adjacent to the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion among the boundaries between the side portions 26 of the notch portion and the side portions 56 of the hanging portion, the progress of metal sticking can be further suppressed.

[0066] Also, similar to the induction furnace kit 1 according to the first aspect, the boundary between the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion faces the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. Therefore, since the internal space 58 shown in FIG. 17 can be filled with the amorphous material 14 or the kneaded filler 6 as shown in FIG. 9 and the like, even if metal sticking occurs at the boundary between the notch portion 21 and the hanging portion 51, the progress of metal sticking can be stopped with the backing material 4 or the like before reaching the furnace body 3.

[0067] Also, as shown in FIGS. 11 to 13, when the hanging portion 51 is installed in the notch portion 21, the convex portion 23 of the notch portion and the convex portion 53 of the hanging portion may face each other in the radial direction with respect to the central axis C1. In this case, when the kneaded filler 6 is filled between the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion, the outflow of the kneaded filler 6 is further suppressed. Therefore, cracks and the like generated by thermal shock caused by molten metal can be suppressed, and metal sticking can be reduced.

[0068] Also, as shown in FIGS. 20 and 21, the sleeve 2 and the hot water outlet pipe 5 may have a difference in linear thermal expansion rate at 1500 °C within a range of 1.5% or less. In this case, between the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion, cracks and the like due to the difference in expansion rate when receiving thermal shock from molten metal can be suppressed, and metal sticking can be reduced.

[0069] Further, as shown in FIG. 9 and the like, when the sleeve 2 and the hot water outlet pipe 5 are installed on the furnace body 3, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion may face the backing material 4 or the kneaded filler 6 in the radial direction with respect to the central axis C1. In this case, even if cracks or the like occur at the boundary between the notch 21 and the hanging portion 51, the progress of the metal insert can be suppressed by the backing material 4 or the kneaded filler 6.

[0070] Furthermore, as shown in FIG. 2 and the like, if at least the positions adjacent to the bottom 25 of the notch and the lower end 55 of the hanging portion can face the backing material 4 or the kneaded filler 6 among the boundaries between the side portion 26 of the notch and the side portion 56 of the hanging portion, the progress of the metal insert can be more effectively suppressed.

[0071] <<Configuration and Effects of Each Embodiment of Induction Furnace Kit 1>> Next, each embodiment of the induction furnace kit 1 according to the first aspect of the present invention and the induction furnace kit 1 according to the second aspect will be described. The examples described below will be described along the configuration shown in FIG. 4(a) described in the induction furnace kit 1 according to the first aspect. Although not shown, the configurations of FIGS. 4(b) and FIGS. 5 to 7 are also possible. Note that the common configurations already described will be omitted from the description.

[0072] <Description of Induction Furnace Kit 1a of the First Embodiment> Referring to FIGS. 4 to 8, the induction furnace kit 1a of the first embodiment will be described. FIGS. 4 to 7 show eight examples of constructing the induction furnace 30 using the induction furnace kit 1a. Each configuration is as already described, and by using the induction furnace kit 1a, the induction furnace 30 can be constructed in the configurations shown in the eight examples according to the form of the furnace body 3. In addition to the eight examples, depending on the form of the furnace body 3, it may be constructed in different states.

[0073] <Effects of Induction Furnace Kit 1a of the First Embodiment> Hereinafter, in the examples shown in FIGS. 4 to 7, each effect will be described. The vertical positional relationship between the notch bottom 25 in the notch 21a and the coil block 7 in the furnace body 3 is different in terms of the life of the furnace body 3 and the performance against damage. As already described, in the examples shown in FIGS. 4 and 5, the notch bottom 25 is located above the upper end of the coil block 7. At this time, at the boundary between the notch bottom 25 and the lower end 55 of the hanging portion, if a metal insert occurs due to a thermal shock by molten metal, even if the metal insert progresses linearly, the coil block 7 is less likely to be linearly impacted, so damage to the furnace body 3 and the like can be more suppressed.

[0074] In the examples shown in FIGS. 6 and 7, the notch bottom 25 is located below the upper end of the coil block 7. At this time, at the boundary between the notch bottom 25 and the lower end 55 of the hanging portion, if a metal insert occurs due to a thermal shock by molten metal, when the metal insert progresses linearly, it reaches the coil block 7. However, since the backing material 4 is formed or the kneaded filler 6 is filled between the boundary between the notch bottom 25 and the lower end 55 of the hanging portion and the coil block 7, the progress of the metal insert is suppressed. In the examples shown in FIGS. 4 to 7, the notch bottom 25 of the notch 21a in the sleeve 2a and the lower end 55 of the hanging portion 51a in the tapping spout 5a are both flat surfaces.

[0075] <Description of the Induction Furnace Kit 1b of the Second Embodiment> Next, with reference to FIG. 9, the induction furnace kit 1b of the second embodiment will be described. Only the differences from the induction furnace kit 1a of the first embodiment will be described. In the induction furnace kit 1b, a convex portion is formed along the vertical direction from either the notch bottom 25 or the lower end 55 of the hanging portion. In the example shown in FIG. 9, in the induction furnace kit 1b, a notch convex portion 23 is formed upward along the vertical direction at the notch bottom 25 of the notch 21b in the sleeve 2b. The lower end 55 of the hanging portion 51b in the tapping spout 5b is a flat surface. In addition to the example shown in FIG. 9, a hanging portion convex portion 53 may be formed downward along the vertical direction at the lower end 55 of the hanging portion 51. At this time, the notch bottom 25 is a flat surface.

[0076] <Effects of the induction furnace kit 1b according to the second embodiment> As described above, the induction furnace kit 1b according to the second embodiment can fill the kneaded filler 6 in an uneven shape at the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion. For the kneaded filler 6, the convex portion serves as a barrier to suppress the outflow. Further, the kneaded filler 6 can be sintered by the molten metal, but is sintered in a non-linear shape. Therefore, even when ingot sticking occurs, the progress can be hindered.

[0077] <Description of the induction furnace kit 1c according to the third embodiment> Next, with reference to FIG. 10, the induction furnace kit 1c according to the third embodiment will be described. In the induction furnace kit 1c, a concave portion is formed along the vertical direction at either the bottom 25 of the notch or the lower end 55 of the hanging portion. In the example shown in FIG. 10, in the induction furnace kit 1c, a notch recess 24 is formed along the vertical direction at the bottom 25 of the notch 21c in the sleeve 2c. The lower end 55 of the hanging portion 51c in the tapping spout 5c is flat. Although not shown, a hanging recess 54 may be formed along the vertical direction at the lower end 55 of the hanging portion. At this time, the bottom 25 of the notch is flat.

[0078] <Effects of the induction furnace kit 1c according to the third embodiment> As described above, the induction furnace kit 1c according to the third embodiment can fill the kneaded filler 6 in the gap and the concave portion at the boundary between the bottom 25 of the notch and the lower end 55 of the hanging portion. For the kneaded filler 6, a pool of molten metal forms in the concave portion to suppress the outflow. Further, the kneaded filler 6 can be sintered by the molten metal, but is sintered in a non-linear shape. Therefore, even when ingot sticking occurs, the progress can be hindered.

[0079] <Description of the induction furnace kit 1d according to the fourth embodiment and the induction furnace kit 1e according to the fifth embodiment> Next, with reference to FIGS. 11 to 13, the induction furnace kit 1d of the fourth embodiment and the induction furnace kit 1e of the fifth embodiment will be described. In the induction furnace kit 1d and the induction furnace kit 1e, as already described, a drooping portion convex portion 53 is formed at the lower end portion 55 of the drooping portion, and a notch portion convex portion 23 is formed at the bottom portion 25 of the notch portion. When the hot water outlet pipe 5 is installed in the sleeve 2, the notch portion convex portion 23 and the drooping portion convex portion 53 face each other in the radial direction with respect to the central axis C1.

[0080] As shown in FIG. 11, in the induction furnace kit 1d, the drooping portion convex portion 53 of the drooping portion 51d in the hot water outlet pipe 5d is formed on the inner side in the radial direction with respect to the central axis C1, and the notch portion convex portion 23 of the notch portion 21d in the sleeve 2d is formed on the outer side in the radial direction than the drooping portion convex portion 53. As shown in FIG. 12, the notch portion convex portion 23 is formed over the entire circumferential direction with respect to the central axis C1 in the notch portion 21. The drooping portion convex portion 53 of the hot water outlet pipe 5 is formed over the entire drooping portion 51 in the radial direction with respect to the central axis C1.

[0081] The fillable region of the kneaded filler 6 formed by the notch portion convex portion 23 and the drooping portion convex portion 53, when viewed from the inner side in the radial direction where the molten metal is poured, advances in the radial direction and then goes upward in the vertical direction, and then is formed in the radial direction toward the internal space 58 shown in FIG. 17. In the induction furnace kit 1d, the outflow of the kneaded filler 6 is suppressed, and it can be sintered in a non-linear zigzag by the molten metal.

[0082] Although not shown, the notch portion convex portion 23 and / or the drooping portion convex portion 53 may not be formed over the entire circumferential direction, and may be formed intermittently in a string blade shape along the circumferential direction, for example. Alternatively, the convex portion may be formed in a part of the circumferential direction. The shape of the convex portion is the same as that of the convex portion in other embodiments. For example, the notch portion convex portion 23 in FIG. 9 is the same.

[0083] As shown in Fig. 13, in the induction furnace kit 1e, the notch convex portion 23 of the notch 21 in the sleeve 2e is formed on the inner side in the radial direction with respect to the central axis C1, and the drooping convex portion 53 of the drooping portion 51e in the tapping spout 5e is formed on the outer side in the radial direction than the notch convex portion 23.

[0084] <Effects of the induction furnace kit 1d of the fourth embodiment and the induction furnace kit 1e of the fifth embodiment> As described above, when the drooping portion 51 is installed in the notch 21, in the induction furnace kits 1d and 1e shown in Figs. 11 to 13, the notch convex portion 23 and the drooping convex portion 53 face each other in the radial direction with respect to the central axis C1. Therefore, the outflow of the more kneaded filler 6 is restricted. Thus, cracks and the like generated by the thermal shock of the molten metal can be suppressed, and the ingot casting can be reduced. Further, due to the notch convex portion 23 and the drooping convex portion 53, the kneaded filler 6 can be sintered in a zigzag shape by the molten metal. Therefore, even if ingot casting occurs, its progress can be hindered.

[0085] Also, as shown in Fig. 11, particularly in the case of the induction furnace kit 1d, the fillable region of the kneaded filler 6 formed by the notch convex portion 23 and the drooping convex portion 53 is such that the filler outlet 18 to the internal space 58 is formed more upward in the vertical direction. Therefore, even if ingot casting occurs and progresses further from the filler outlet 18, the direct influence on the coil block 7 can be reduced in the induction furnace kit 1d. This is because, as described with reference to Figs. 4 and 5, when ingot casting progresses linearly, it is more likely to hit the iron skin 10 or the like instead of hitting the coil block 7.

[0086] <Description of the induction furnace kit 1f of the sixth embodiment> Next, with reference to FIGS. 14 and 15, the induction furnace kit 1f of the sixth embodiment will be described. In the induction furnace kit 1f, recesses are formed in the bottom 25 of the notch and the lower end 55 of the hanging portion, respectively. One recess and the other recess are formed at different positions in the radial direction with respect to the central axis C1. In the example shown in FIGS. 14 and 15, a notch recess 24 is formed inside in the radial direction at the bottom 25 of the notch, and a hanging portion recess 54 is formed outside in the radial direction than the notch recess 24 at the lower end 55 of the hanging portion. It is desirable that the notch recess 24 and the hanging portion recess 54 are formed at positions that do not overlap in the vertical direction.

[0087] As shown in FIG. 15, the notch recess 24 in the sleeve 2f is formed in the entire circumference of the notch 21f in the circumferential direction with respect to the central axis C1. The hanging portion recess 54 of the hanging portion 51f in the tapping spout 5f is formed in the entire circumference of the lower end 55 of the hanging portion in the circumferential direction with respect to the central axis C1. Although not shown, the notch recess 24, and / or the hanging portion recess 54 may be formed intermittently in a string blade shape instead of the entire circumference in the circumferential direction. Or it may be formed partially. The shape of the recess is common to the embodiments shown in FIGS. 10 and 16. In addition to the example shown in FIGS. 14 and 15, a notch recess 24 may be formed outside in the radial direction at the bottom 25 of the notch, and a hanging portion recess 54 may be formed inside in the radial direction than the notch recess 24 at the lower end 55 of the hanging portion.

[0088] <Effect of the induction furnace kit 1f of the sixth embodiment> As described above, in the induction furnace kit 1f of the sixth embodiment, the notch recess 24 and the hanging portion recess 54 are formed at positions that do not overlap in the vertical direction. Therefore, when the filler 6 kneaded between the bottom 25 of the notch and the lower end 55 of the hanging portion is filled, the recess becomes a hot water reservoir and the outflow is suppressed. In particular, since the notch recess 24 and the hanging portion recess 54 are in positions that do not overlap in the vertical direction, the locations of the hot water reservoirs are dispersed, suppressing the outflow of the more kneaded filler 6. Thereby, the occurrence of metal casting can be reduced between the bottom 25 of the notch and the lower end 55 of the hanging portion.

[0089] <Description of the induction furnace kit 1g of the seventh embodiment> Next, referring to FIG. 16, the induction furnace kit 1g of the seventh embodiment will be described. In the induction furnace kit 1g, a convex portion is formed on either the bottom portion 25 of the notch or the lower end portion 55 of the hanging portion, and a concave portion is formed on the other. When the hanging portion 51 is installed in the notch 21, the convex portion and the concave portion fit together with each other and face each other in the radial direction with respect to the central axis C1.

[0090] In the example shown in FIG. 16, in the induction furnace kit 1g, a hanging portion convex portion 53 is formed at the lower end portion 55 of the hanging portion 51g in the hot water outlet pipe 5g, and a notch concave portion 24 is formed at the bottom portion 25 of the notch 21g in the sleeve 2g. In addition to the example shown in FIG. 16, although not shown, a notch convex portion 23 may be formed at the bottom portion 25 of the notch, and a hanging portion concave portion 54 may be formed at the lower end portion 55 of the hanging portion.

[0091] <Effect of the induction furnace kit 1g of the seventh embodiment> As described above, in the induction furnace kit 1g of the eighth embodiment, the fillable region of the kneaded filler 6 formed by the convex portion and the concave portion is formed in a zigzag in the radial direction with respect to the central axis C1. Therefore, even if a metal piece is inserted between the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion, the progress can be suppressed.

[0092] Also, in the same manner as the comparative description with reference to FIGS. 11 and 13, particularly in the example shown in FIG. 16, the filler outlet 18 in the fillable region of the kneaded filler 6 formed by the notch concave portion 24 and the hanging portion convex portion 53 is formed more upward in the vertical direction. Therefore, even if a metal piece insertion occurs and the filler further progresses from the filler outlet 18, the direct influence on the coil block 7 can be further reduced in the induction furnace kit 1g.

[0093] <Description of the induction furnace 30> Next, the induction furnace 30 according to the third aspect of the present invention will be described. The induction furnace 30 is constructed using the induction furnace kit 1 already described. As shown in FIG. 3 and the like, in the radial direction with respect to the central axis C1, a backing material 4 is formed between the sleeve 2 and the furnace body 3. The hanging portion 51 is installed in the notch portion 21, and the inner peripheral surface 52 of the hanging portion is continuous with the inner peripheral surface 22 of the sleeve. The hanging portion 51 faces the sleeve 2 via the kneaded filling material 6 in the vertical direction. As shown in FIG. 17, the boundary between the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion faces the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1.

[0094] Furthermore, the boundary between the side portion 26 of the notch portion and the side portion 56 of the hanging portion may face the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. In particular, at least at positions adjacent to the bottom portion 25 of the notch portion and the lower end portion 55 of the hanging portion among the boundaries between the side portion 26 of the notch portion and the side portion 56 of the hanging portion, it may face the furnace body 3 across the internal space 58. The internal space 58 is in a state where the backing material 4 is formed or / and filled with the kneaded filling material 6. The space between the bottom portion 25 of the notch portion and the lower end portion 55 and the space between the side portion 26 of the notch portion and the side portion 56 of the hanging portion are filled with the kneaded filling material 6.

[0095] The configuration of the furnace body 3 in the induction furnace 30 will be described. As shown in FIGS. 1 to 3, in the furnace body 3, a joint iron 17 is formed on the outer periphery of the coil block 7 in which the induction coil 8 is built-in, and an outer shell is formed by the iron skin 10. The iron skin 10 surrounds the outer periphery of the joint iron 17, and as further shown in FIG. 3 and the like, it is formed to receive the lower side of the tapping spout 5. The coil retainer 13 is attached to the upper side of the coil block 7 and the joint iron 17. The pressing plate 19 is attached to the upper side of the coil retainer 13 with the sealing material 9 interposed therebetween. The bottom plate brick 12 is formed on the outer bottom of the furnace body 3. Inside the furnace body 3, the sleeve 2 is attached, and a backing material 4 made of an amorphous material 14 is formed between the sleeve 2 and the coil block 7. The inner bottom material 11 is formed inside the sleeve 2 at the inner bottom of the furnace body 3.

[0096] The induction furnace 30 described above is a representative example using the induction furnace kit 1. The induction furnace 30 includes those using the induction furnace kit 1a of the first embodiment to the induction furnace kit 1g of the seventh embodiment.

[0097] <Effect of the induction furnace 30> In the induction furnace 30 described above, the boundary between the bottom 25 of the notch and the lower end 55 of the hanging part faces the backing material 4 and / or the kneaded filler 6 in the radial direction with respect to the central axis C1. Therefore, even if metal pouring occurs at the boundary between the bottom 25 of the notch and the lower end 55 of the hanging part due to the molten metal, it is possible to suppress the extension of the metal pouring by the backing material 4 and / or the kneaded filler 6. Further, if the backing material 4 or the kneaded filler 6 faces at least the position adjacent to the bottom 25 of the notch and the lower end 55 of the hanging part among the boundaries between the side part 26 of the notch and the side part 56 of the hanging part, the progress of the metal pouring can be further suppressed.

[0098] Also, the effects in the induction furnace kit 1 according to the first aspect and the second aspect already described are the same in the induction furnace 30. That is, the effects exhibited by the induction furnace kit 1a of the first embodiment to the induction furnace kit 1g of the seventh embodiment are the same in the induction furnace 30.

[0099] <Explanation of the construction method of the induction furnace 30> Next, with reference to FIG. 18, the induction furnace construction method according to the fourth aspect of the present invention will be described. The induction furnace construction method is a method of constructing the induction furnace 30 using the induction furnace kit 1 already described. The induction furnace construction method includes the following steps. That is, a step of kneading the filler 6 with an aqueous sodium silicate solution to form a kneaded material. A step of installing the sleeve 2 on the inner peripheral portion of the furnace body 3. A step of applying the kneaded filler 6 to each predetermined portion of the tapping spout 5 and the sleeve 2. A step of installing the tapping spout 5 so that the inner peripheral surface 52 of the hanging part is continuous with the inner peripheral surface 22 of the sleeve along the vertical direction at the notch 21 of the sleeve 2. A step of forming the backing material 4 by charging the amorphous material 14 between the furnace body 3 and the sleeve 2.

[0100] By the steps described above, the hanging portion 51 faces the sleeve 2 in the vertical direction via the kneaded filler 6. The boundary between the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion faces the furnace body 3 across the internal space 58 shown in FIG. 17 in the radial direction with respect to the central axis C1. The internal space 58 forms the backing material 4 and / or is filled with the kneaded filler 6. The space between the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion and the space between the side portion 26 of the notch and the side portion 56 of the hanging portion are filled with the kneaded filler 6.

[0101] <Effect of the construction method of the induction furnace 30> According to the induction furnace construction method described above, the following effects can be obtained. The induction furnace construction method is carried out on the furnace body 3 using the induction furnace kit 1. As shown in FIG. 17, the boundary between the bottom portion 25 of the notch and the lower end portion 55 of the hanging portion and the boundary between the side portion 26 of the notch and the side portion 56 of the hanging portion face the furnace body 3 across the internal space 58 in the radial direction with respect to the central axis C1. As shown in FIG. 4 and the like, even if metal pouring occurs due to the molten metal at the boundary between the notch 21 and the hanging portion 51, the progress can be suppressed by the backing material 4 and / or the kneaded filler 6, and the extension of the metal pouring can be suppressed.

[0102] In addition, the effects exhibited by the induction furnace kit 1 according to the first aspect and the second aspect already described and the induction furnace 30 according to the third aspect are also obtained in the induction furnace 30 constructed by the induction furnace construction method.

Example

[0103] Next, with reference to FIGS. 19 to 21, examples of the induction furnace kit 1 and the induction furnace 30 of the present invention will be described. As examples, six types of sleeves 2 from A1 to F1, six types of kneaded fillers 6 from A2 to F2, and two types of tapping spouts 5, G1 and H1, were selected. The sleeves 2 and the tapping spouts 5 used in the examples and the comparative examples are the sleeves 2a and the tapping spouts 5a in the induction furnace kit 1a of the first embodiment.

[0104] The filler 6 is a kneaded material formed by kneading a powder with an aqueous sodium silicate solution. The mass percentages of the main chemical components of the kneaded filler 6 from A2 to F2 vary depending on the amount of the aqueous sodium silicate solution used for kneading, but the kneaded material is kneaded to a viscosity or hardness that is easy to apply. The filler 6 is a value measured immediately after producing the kneaded material with the aqueous sodium silicate solution from the powder state, and is filled between the notch 21 of the sleeve 2 and the drooping part 51 of the hot water outlet pipe 5, and is a value measured after a certain period of time has elapsed, and there is no change between the two.

[0105] From A1 to C1 of the sleeve 2, for example, the target metal is cast steel or special steel. For D1 and E1 of the sleeve 2, for example, the target metals are cast steel, special steel, and general steel. For F1 of the sleeve 2, for example, the target metal is cast iron.

[0106] Next, with reference to FIGS. 19 to 21, examples and comparative examples will be described. The examples shown in FIG. 19 are Examples 1 to 6. The examples shown in FIG. 20 are Examples 7 to 9 and comparative examples. FIG. 21 shows the main chemical components of the sleeve 2 and the kneaded filler 6 in Examples 1 to 9.

[0107] FIGS. 19 and 20 show the chemical components and the linear thermal expansion coefficient at 1500°C in each example and comparative example. The linear thermal expansion coefficient was measured by a measuring device and a measuring method conforming to JIS R2207-3 at 1500°C. In FIG. 19, all of the hot water outlet pipes 5 from Example 1 to Example 6 are G1. The combinations of the sleeve 2 and the kneaded filler 6 are Example 1 with A1 and A2, Example 2 with B1 and B2, Example 3 with C1 and C2, Example 4 with D1 and D2, Example 5 with E1 and E2, and Example 6 with F1 and F2. In FIG. 20, all of the hot water outlet pipes 5 of Examples 7 to 9 and the comparative example are H1. The combinations of the sleeve 2 and the kneaded filler 6 are Example 7 with D1 and D2, Example 8 with E1 and E2, and Example 9 with F1 and F2. The comparative example is B1 and B2.

[0108] In Examples 1 to 9, the range of the difference in linear thermal expansion coefficient at 1500 °C between the sleeve 2 and the filler 6 kneaded therewith was all 0.5% or less. The range of the difference in linear thermal expansion coefficient at 1500 °C between the kneaded filler 6 and the hot water outlet pipe 5 was all 1.0% or less. The range of the difference in linear thermal expansion coefficient at 1500 °C between the sleeve 2 and the hot water outlet pipe 5 was all 1.5% or less.

[0109] The comparative example will be described. As shown in Fig. 20, the comparative example is a combination of a sleeve B1, a filler B2, and a hot water outlet pipe H1. The range of the difference in linear thermal expansion coefficient at 1500 °C between the sleeve 2 and the filler 6 kneaded therewith was 0.5% or less. However, in the comparative example, the range of the difference in linear thermal expansion coefficient at 1500 °C between the kneaded filler 6 and the hot water outlet pipe 5 was 1.8%. The range of the difference in linear thermal expansion coefficient at 1500 °C between the sleeve 2 and the hot water outlet pipe 5 was 1.67%. That is, the range of the difference in linear thermal expansion coefficient at 1500 °C was all 1.5% or more.

[0110] Next, the crack generation results will be described. The lowermost row of Figs. 19 and 20 shows a column indicating the presence or absence of cracks and the like after the test. As a 1-cycle test, the results of repeating 10 cycles of a thermal shock test in which the space between the notch 21 of the sleeve 2 and the hanging part 51 of the hot water outlet pipe 5 was filled with the kneaded filler 6, exposed to a 1000 °C environment for 3 hours, and then air-cooled are shown. In Examples 1 to 9, there were no problems such as cracks and the results were good.

[0111] On the other hand, in the comparative example, cracks occurred in the kneaded filler 6 between the hot water outlet pipe 5 and the sleeve 2, particularly at a position biased toward the hot water outlet pipe 5 side. In the comparative example, the occurrence of cracks in the kneaded filler 6 near the sleeve 2 was slight. From this result, it is assumed that the occurrence of metal sticking in the induction furnace 30 of the comparative example starts from the vicinity of the hot water outlet pipe 5 and progresses radially or along the hot water outlet pipe 5. In this case, the damage to the sleeve 2 is small, and it is assumed that the induction furnace 30 can be used by replacing the hot water outlet pipe 5 if metal sticking occurs.

[0112] Next, referring to FIG. 21, in the combination of the sleeve 2 and the filler 6 kneaded therewith in the embodiment of the present invention, the range of the difference in mass% of the main chemical components contained in the sleeve 2 and the filler 6 kneaded therewith will be described. The main chemical components are aluminum oxide, magnesium oxide, and silicon dioxide. In all of Examples 1 to 9, the difference in mass% of the main chemical components is within 10%. As already explained, the range of the difference in linear thermal expansion coefficient at 1500 ° C. between the sleeve 2 and the filler 6 kneaded therewith is 0.5% or less, and this is one of the factors that the mass% of the main chemical components is close.

Explanation of symbols

[0113] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g Kit for induction furnace 2, 2a, 2b, 2c, 2d, 2e, 2f, 2g Sleeve 3 Furnace body 4 Backing material 5, 5a, 5b, 5c, 5d, 5e, 5f, 5g Tap hole pipe 6 Filler 7 Coil block 8 Induction coil 14 Refractory material 21, 21a, 21b, 21c, 21d, 21e, 21f, 21g Notch 22 Inner peripheral surface of sleeve 23 Notch convex part 25 Notch bottom 26 Notch side 30 Induction furnace 51, 51a, 51b, 51c, 51d, 51e, 51f, 51g Sagging part 52 Inner peripheral surface of sagging part 53 Sagging part convex part 55 Lower end of sagging part 56 Side of sagging part 58 Internal space 59 Tip of pipe C1 Central axis

Claims

1. A kit that can be installed on the furnace body of a cylindrical induction furnace, comprising: a cylindrical sleeve made of a shaped material centered on the central axis; a tapping spout that can be installed on the furnace top of the furnace body; a filler; the direction of the central axis is the vertical direction with the side of the furnace top in the furnace body as the upper side and the bottom side as the lower side; a notch is formed at the top of the sleeve; the notch includes a notch bottom that is the lower end and a notch side that is the side wall of the sleeve in the circumferential direction with respect to the central axis; the tapping spout has a drooping portion formed on the side opposite to the spout tip; the drooping portion includes a drooping portion lower end and a drooping portion side that is the circumferential end with respect to the central axis; the drooping portion can be installed in the notch of the sleeve, and when installed in the notch, the inner peripheral surface of the drooping portion is formed to be continuous with the inner peripheral surface of the sleeve; when the sleeve and the tapping spout are installed on the furnace body, in the vertical direction, the notch bottom and the drooping portion lower end face each other, and in the circumferential direction with respect to the central axis, the notch side and the drooping portion side face each other; an internal space surrounded by the tapping spout, the sleeve, and the furnace body is formed; the boundary between the notch bottom and the drooping portion lower end faces the furnace body across the internal space in the radial direction with respect to the central axis; the filler can be kneaded with an aqueous sodium silicate solution; the kneaded filler can fill the space between the notch bottom and the drooping portion lower end and the space between the notch side and the drooping portion side; a kit for an induction furnace in which the difference in linear thermal expansion coefficient between the kneaded filler and the sleeve at 1500 °C is in the range of 1.5% or less.

2. The kit for an induction furnace according to Claim 1, wherein the difference in linear thermal expansion coefficient between the kneaded filler and the tapping spout at 1500 °C is in the range of 1.5% or less.

3. comprising an amorphous material capable of forming a backing material around the sleeve; the internal space can be filled with the amorphous material and / or the kneaded filler; the kit for an induction furnace according to Claim 1, wherein the boundary between the notch bottom and the drooping portion lower end can face the backing material or the filler in the radial direction with respect to the central axis.

4. A kit that can be installed on the furnace body of a cylindrical induction furnace, comprising: a cylindrical sleeve made of a shaped material centered on the central axis; a tapping spout that can be installed on the furnace top of the furnace body. The direction of the central axis is the vertical direction with the side of the furnace top in the furnace body as the upper side and the side of the bottom as the lower side. A notch is formed at the top of the sleeve. The notch includes a notch bottom which is the lower end part and a notch side part which is the side wall of the sleeve in the circumferential direction with respect to the central axis. A drooping part is formed on the side of the hot water outlet pipe opposite to the pipe tip. The drooping part includes a drooping part lower end part and a drooping part side part which is the end part in the circumferential direction with respect to the central axis. The drooping part can be installed in the notch of the sleeve, and when installed in the notch, the inner peripheral surface of the drooping part is formed to be continuous with the inner peripheral surface of the sleeve. When the sleeve and the hot water outlet pipe are installed on the furnace body. In the vertical direction, the notch bottom and the drooping part lower end part face each other, and in the circumferential direction with respect to the central axis, the notch side part and the drooping part side part face each other. An internal space surrounded by the hot water outlet pipe, the sleeve, and the furnace body is formed. The boundary between the notch bottom and the drooping part lower end part faces the furnace body across the internal space in the radial direction with respect to the central axis. An induction furnace kit in which at least one of the notch bottom and the drooping part lower end part is formed with a convex part and / or a concave part along the vertical direction.

5. A drooping part convex part is formed at the lower end part of the drooping part, and a notch convex part is formed at the bottom of the notch. When the hot water outlet pipe is installed on the sleeve. The induction furnace kit according to claim 4, wherein the notch convex part and the drooping part convex part face each other in the radial direction with respect to the central axis.

6. The induction furnace kit according to claim 4, wherein the difference in the linear thermal expansion rate between the sleeve and the hot water outlet pipe at 1500 °C is in the range of 1.5% or less.

7. An amorphous material capable of forming a back material around the sleeve, And a filling material. The filling material can be kneaded with an aqueous sodium silicate solution. The kneaded filling material can fill the space between the notch bottom and the drooping part lower end part and the space between the notch side part and the drooping part side part. The internal space can be filled with the amorphous material and / or the kneaded filling material. The induction furnace kit according to claim 4, wherein the boundary between the notch bottom and the drooping part lower end part can face the back material or the filling material in the radial direction with respect to the central axis.

8. In the case where a coil block including an induction coil is formed on the furnace body. When the sleeve and the hot water outlet pipe are installed on the furnace body, The bottom of the notch is located above the upper end of the coil block in the vertical direction. The induction furnace kit according to any one of claims 1 to 7.

9. An induction furnace constructed by the induction furnace kit according to claim 3 or 7, In the radial direction with respect to the central axis, the backing material is formed between the sleeve and the furnace body, The hanging portion is Installed in the notch, and the inner peripheral surface of the hanging portion is continuous with the inner peripheral surface of the sleeve, In the vertical direction, it faces the sleeve through the kneaded filler, The boundary between the bottom of the notch and the lower end of the hanging portion faces the furnace body across the internal space in the radial direction with respect to the central axis, The internal space is in a state where the backing material is formed or / and filled with the kneaded filler, An induction furnace in which the space between the bottom of the notch and the lower end of the hanging portion and the space between the side portion of the notch and the side portion of the hanging portion are filled with the kneaded filler.

10. A method for constructing an induction furnace by using the induction furnace kit according to claim 3 or 7, A step of kneading the filler with an aqueous sodium silicate solution, A step of installing the sleeve on the inner peripheral portion of the furnace body, A step of applying the filler to each predetermined position of the hot water outlet pipe and the sleeve, A step of installing the hot water outlet pipe in the notch of the sleeve so that the inner peripheral surface of the hanging portion is continuous with the inner peripheral surface of the sleeve along the vertical direction, A step of forming the backing material by pouring the amorphous material between the furnace body and the sleeve, The hanging portion faces the sleeve through the kneaded filler in the vertical direction, The boundary between the bottom of the notch and the lower end of the hanging portion faces the furnace body across the internal space in the radial direction with respect to the central axis, The internal space forms the backing material or / and is filled with the kneaded filler, A method for constructing an induction furnace in which the space between the bottom of the notch and the lower end of the hanging portion and the space between the side portion of the notch and the side portion of the hanging portion are filled with the kneaded filler.

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