JPH038957Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a hot water heating furnace that processes molten metal, such as blending the components of the molten metal and raising the temperature thereof, and is particularly concerned with an iron-free induction furnace suitable for intermittent processing. This invention relates to a hot water supply furnace that can be applied to continuous processing.

<Prior Art> Induction furnaces have conventionally been used to mix and heat up molten metal supplied from a molten metal supply furnace. The types of induction furnaces are groove-type induction furnaces suitable for continuous processing, and iron-free core (crucible) suitable for intermittent processing.
There is a type induction furnace.

FIG. 4 shows a longitudinal sectional view of a channel induction furnace used for continuous processing. It consists of a furnace 40 in which a furnace material 42 is stretched on the inner surface of a furnace shell 41, and a furnace lid 43 in which a furnace material 42 is similarly stretched, and a heat-resistant material is made of a substantially central portion of the furnace 40 at the bottom of the furnace lid 43. A weir plate 44 is installed to divide the furnace into left and right furnace chambers. The molten metal 45 is supplied from the inlet 46 at the top of the right furnace chamber of the furnace 40 and taken out from the tap 47 at the top of the left furnace chamber.In order to raise the temperature of the molten metal 45, there is a
A heating groove 48 is provided in which a secondary coil, an iron core, etc. (none of which are shown) are disposed. In order to raise the temperature of the molten metal and mix the components using this groove-type induction furnace, the molten metal receiving port 46 is connected to a molten metal supply furnace (not shown).
, and supplies molten metal into the furnace 40 from the inlet 46. Additives are added just before the inlet 46 and are introduced into the furnace chamber on the right side together with the molten metal, passing under the weir plate 44 as shown by the solid arrow in the figure, and from the furnace chamber on the left side to the casting equipment, etc. (not shown). During this time, the components are mixed and the temperature is increased.

This channel-type induction furnace utilizes the flow characteristics of the molten metal and has a strong mixing force for the molten metal, making it suitable for continuous processing. However, when using this groove type induction furnace to perform intermittent processing that includes regular or irregular interruptions, it is not suitable for tapping the entire amount of molten metal in the furnace, and due to the characteristics of the furnace, it is necessary to use electric power to keep the furnace warm. It is necessary to maintain the entire molten metal within a certain temperature range by applying an electric current, and if the interruption time is long, energy for keeping it warm will be significantly wasted.

In addition, the equipment cost of trench type induction furnaces increases, and
It also has the disadvantage of requiring a larger installation space.

On the other hand, although the structure of a typical ironless core induction furnace is not shown in the drawings, it has a structure that is suitable for intermittent processing and is not suitable for continuous processing.

<Problems to be solved by the invention> As described above, conventional induction furnaces are suitable for either continuous processing or intermittent processing, and no induction furnace with versatility suitable for both processes has been developed. . Therefore, when operating for this purpose, a channel induction furnace is uneconomical, and a normal coreless induction furnace is inappropriate.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a hot water supply furnace that can be suitably applied to both continuous processing and intermittent processing.

<Means for solving the problem> For this reason, the present invention improves the iron-core induction furnace to make it suitable for continuous processing, and the introduction pipe for introducing the molten metal into the iron-core induction furnace is It is characterized in that it is disposed so that its lower end is below the outlet of the furnace.

<Function> The molten metal supplied to the introduction pipe flows into the furnace from the lower part of the introduction pipe, and is rapidly stirred and mixed by the flow of the molten metal during this inflow. Therefore, mixing of the molten metal is performed efficiently, and continuous processing becomes possible.

<Example> Hereinafter, the present invention will be specifically described with reference to an illustrative example.

FIG. 1 is a longitudinal sectional view of an embodiment of the hot water supply furnace of the present invention. This hot water supply furnace consists of an ironless core induction furnace 10 that performs predetermined processes such as mixing and temperature raising, and a supply device 1 that is attached to the induction furnace 10 and supplies molten metal. A conventionally known iron-core induction furnace 10 is used. That is, a heat-resistant brick 12 is laid in the lower part of the furnace shell 11, a furnace material 13 is provided on the heat-resistant brick 12, and a furnace chamber 14 is formed.
A heating coil 15 is wound around the outer peripheral surface of the intermediate portion of the furnace material 13, and a cooling coil 16 is wound around the outer peripheral surface located below the heating coil 15.
These coils 15 and 16 are held by a yoke 17. A flange 11a is formed at the upper end of the furnace shell 11, and a furnace lid 19 having a furnace material 18 attached to its lower surface is removably attached to this flange portion 11a. Here, the furnace shell 11
The left side portion of the furnace lid 19 is opened and the molten metal 20
This serves as an outlet 21 for taking out the water. The temperature of the molten metal introduced into the furnace is raised by the heating coil 15, and the molten metal is stirred and mixed by the electromagnetic stirring action (indicated by the broken line in the figure) unique to ironless core furnaces, and then taken out from the tap 21. It has a structure that allows

The supply device 1 includes a gutter body 2 that slopes low toward the induction furnace 10 and an introduction pipe 3 that communicates with the lower end of the gutter body 2. The gutter body 2 has a furnace material 4 on the top surface.
The lower end is fixed to the furnace cover 19, and the upper end is connected to a molten metal supply furnace (not shown). The furnace lid 19 does not need to completely cover the opening of the furnace, and may be omitted. In this case, the gutter body 2 is directly connected to the furnace shell 1 by another means.
It should be fixed to 1. This gutter body 2 has a furnace material 5 on the bottom surface.
The gutter cover 6 covered with
A chute port 7 for supplying an additive to the molten metal passing through the gutter body 2 is attached to a part of the gutter body 2 via a valve 8 . As a result, the molten metal flowing down the gutter body 2 is transferred to the furnace chamber 14 together with the additive material supplied from the chute port 7.
It has a structure that leads you inward. On the other hand, the introduction pipe 3 is connected to the furnace lid 19 of the induction furnace 10 and its furnace material 18.
It is attached to the furnace lid 19 so that the lower end thereof is below the tap hole 21 and hangs down approximately at the center of the furnace chamber 14 of the induction furnace 10 . If the furnace lid 19 is not used, the inlet tube 3 may be attached to a bridging member, such as a channel, suspended over the furnace opening.
Therefore, the lower part of the introduction pipe 3 is immersed in the molten metal 20 supplied and stored in the furnace chamber 14. When the molten metal is supplied, it flows through the introduction pipe 3 as shown by the solid arrow in the same figure.
It flows out from the lower end into the molten metal 20 in the furnace chamber 14,
Due to the electromagnetic stirring action unique to the ironless core furnace, the molten metal is stirred into a turbulent flow as indicated by the broken line arrow in the same figure, and mixed uniformly, and the entire molten metal is heated to a required temperature by the heating coil 15. Therefore, the molten metal that has been uniformly mixed and heated is continuously taken out from the tap 21, and processing such as casting can be performed continuously. In such a process, it is preferable that the introduction tube 3 has a length such that its lower end reaches approximately the center of the height of the heating coil 15. This is because if the length of the introduction tube 3 is smaller than this, the mixing efficiency will decrease, while if it is longer, the strength of the introduction tube 3 needs to be increased. In addition,
After the above-mentioned work is completed, the induction furnace 10 can be tilted using the vicinity of the tap 21 as a fulcrum to tap the metal, similar to the conventional ironless core type induction furnace. in this case,
The supply device 1 can be tapped either while attached to the induction furnace 10 or removed.

FIGS. 2 and 3 are a longitudinal sectional view and a plan view showing another embodiment of the present invention, in which the same elements as in the previous embodiment are designated by the same reference numerals. In this embodiment, the furnace shell 11 of the ironless core type induction furnace 10 is
A flange 11a is formed on the upper part over the entire circumference, and a flange 19a is similarly formed on the furnace lid 19, so that the furnace lid 19 completely covers the furnace shell 11. Further, the tap 21 is formed to protrude obliquely upward from the side surface of the furnace shell 11, and the inside of the furnace that communicates with the tap 21 is formed to be slanted downward. Therefore, by supplying the molten metal so that the liquid level of the molten metal 20 is located above the tapping port 21, the furnace chamber
4 can have a closed structure. The furnace cover 19 is provided with an inert gas, a reducing gas inlet 22, and a decompression port 2 at appropriate positions except for the installation part of the supply device 1.
3 is provided. Therefore, in this embodiment, the connection between the supply device 1 and the molten metal supply furnace (not shown) is sealed, and the inert gas or reducing gas is supplied into the furnace chamber 14 from the gas inlet 22. It becomes possible to create a reducing atmosphere inside the furnace, and it can be used not only as a mixing and temperature raising furnace but also as a reducing furnace. Here, degassing is also possible by connecting the decompression port 23 to a vacuum evacuation device (not shown), expanding the range of uses.

<Effects of the invention> As described above, according to the invention, an introduction pipe for supplying molten metal is installed vertically on the furnace lid of a coreless induction furnace that mixes molten metal and heats it intermittently, and mixes the molten metal. Since the efficiency is increased, blending and temperature raising can be carried out continuously, and it is possible to suitably carry out both intermittent treatment and continuous treatment of molten metal.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, Figs. 2 and 3 are longitudinal sectional views and plan views of another embodiment, and Fig. 4 is a longitudinal sectional view of a conventional channel induction furnace. be. 3...Introduction pipe, 10...Ironless core induction furnace, 19
...the hearth.

Claims (1)

[Scope of utility model registration request] A hot water supply furnace characterized in that an introduction pipe for introducing molten metal into a coreless induction furnace is arranged such that its lower end is below a tap outlet of the furnace.