JP6405709B2 - melting furnace - Google Patents

Description

  The present invention relates to a melting furnace for generating and storing a molten metal supplied to a casting facility or the like.

  Lightweight, high specific strength, high specific rigidity, and excellent shock absorption, magnesium alloys have recently been used as constituent materials for casings for portable products such as mobile phones and notebook computers, and for various parts such as automotive parts. It is being used.

  The molten magnesium alloy supplied to the casting facility is generated, for example, by melting a preheated magnesium alloy ingot in a melting furnace, as disclosed in Patent Document 1.

JP 2012-24786 A

  At the bottom of the melting furnace in which the molten metal is stored, oxides generated in the furnace, compounds precipitated from the molten metal, and the like (hereinafter collectively referred to as “inclusions”) are deposited. However, when the molten metal mixed with the inclusions is supplied to the casting apparatus, the quality of the cast product is deteriorated. Therefore, it is necessary to take out only the molten metal on the upper side of the melting furnace and supply it to the casting apparatus.

However, since the ingot charged into the melting furnace is at a lower temperature than the molten metal in the melting furnace, the temperature of the molten metal around the charged ingot decreases, and further, heat convection occurs between the molten metal around the molten ingot. Occurs. And the inclusions roll up by this thermal convection, and the inclusions may be supplied to the casting apparatus together with the molten metal.
Further, not only the thermal convection of the molten metal, but also the inclusions may be rolled up vigorously by the impact when the ingot sinks to the bottom of the melting furnace.

  On the other hand, depending on the type of metal, the compound may be precipitated due to a decrease in the temperature of the molten metal due to the introduction of the ingot. Therefore, suppressing the temperature drop of the molten metal indirectly leads to preventing the product quality from being lowered.

  The main object of the present invention is to provide a melting furnace capable of preventing molten metal mixed with inclusions from being supplied to a subsequent process such as a casting facility.

A melting furnace according to an aspect of the present invention is:
A melting furnace having a furnace body for melting a metal lump in a stored molten metal,
The furnace body is
A first chamber into which the metal mass is charged;
A second chamber from which molten metal is taken out for supply to the next process;
An intermediate chamber that is provided between the first chamber and the second chamber and suppresses thermal convection between the two chambers;
It is equipped with.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the molten metal in which the inclusion was mixed will be supplied to the following processes, such as casting equipment.

1 is a schematic view of a melting furnace according to a first embodiment of the present invention. It is the schematic of the melting furnace which concerns on 2nd Embodiment of this invention. It is the schematic of the melting furnace which concerns on 3rd Embodiment of this invention. It is the schematic which shows the melting furnace which concerns on a comparative example. It is the schematic which shows the melting furnace which concerns on a comparative example.

[Summary of Embodiment of the Present Invention]
First, the gist of the embodiment of the present invention will be listed and described. In addition, each embodiment described below can also combine the part arbitrarily.
(1) A melting furnace according to an embodiment of the present invention includes:
A melting furnace having a furnace body for melting a metal lump in a stored molten metal,
The furnace body is
A first chamber into which the metal mass is charged;
A second chamber from which molten metal is taken out for supply to the next process;
An intermediate chamber that is provided between the first chamber and the second chamber and suppresses thermal convection between the two chambers;
It has.

  According to this embodiment, since the intermediate chamber which suppresses the heat convection between both chambers is provided between the first chamber and the second chamber, the molten metal is formed around the ingot charged into the first chamber. Even if the temperature of the first chamber decreases and thermal convection occurs in the first chamber, the intermediate chamber suppresses thermal convection between the second chamber and the inclusions accumulated in the second chamber roll up. Can be prevented. Therefore, it is possible to prevent the molten metal mixed with inclusions from being supplied from the second chamber to a casting facility or the like.

(2) Each chamber may be formed by partitioning the interior of the furnace body with a partition wall.
With such a configuration, the structure of the furnace body can be simplified.

(3) It is preferable that a meandering channel for meandering the flow of the molten metal is formed in the intermediate chamber.
With such a configuration, resistance of the molten metal flow in the intermediate chamber can be increased, and thermal convection between the first chamber and the second chamber can be suitably suppressed, and the first chamber can be used even in a small space. The length of the flow path can be ensured between the first chamber and the second chamber.

(4) In the configuration of (2), the intermediate chamber is disposed below the first chamber via a first partition extending in the horizontal direction,
The second chamber is disposed on a horizontal side of the first chamber and the intermediate chamber via a second partition wall extending in the vertical direction,
A first flow port is formed between the first partition and the second partition to circulate the first chamber and the intermediate chamber,
Between the second partition wall and the bottom wall of the furnace body, a second flow port for flowing the intermediate chamber and the second chamber is formed,
In the intermediate chamber, it is preferable that a third partition wall extending in a horizontal direction is provided to form a meandering flow path for meandering the flow of the molten metal between the first circulation port and the second circulation port. .

  With such a configuration, the first chamber, the second chamber, and the intermediate chamber can be easily formed inside the furnace body using the partition walls, and a meandering channel can also be formed in the intermediate chamber.

(5) In the configuration of (2), the first chamber, the intermediate chamber, and the second chamber are arranged side by side in a horizontal direction, and between the first chamber and the intermediate chamber, and A fourth partition wall and a fifth partition wall extending in the vertical direction are provided between the intermediate chamber and the second chamber,
A first flow port for flowing between the first chamber and the intermediate chamber is provided on the lower side of the fourth partition wall,
A second circulation port that circulates between the intermediate chamber and the second chamber may be provided on the upper side of the fifth partition wall.

With such a configuration, the first chamber, the second chamber, and the intermediate chamber can be easily formed inside the furnace body using the partition walls.
Moreover, since the metal lump charged into the furnace body is at a lower temperature than the molten metal in the furnace body, the temperature of the molten metal decreases around the metal lump charged into the first chamber, and heat convection occurs in the first chamber. Then, the molten metal on the whole or lower side of the first chamber gradually becomes lower in temperature than the molten metal in the intermediate chamber or the second chamber. In this embodiment, the first flow port between the first chamber and the intermediate chamber is disposed on the lower side of the fourth partition, and the second flow port between the intermediate chamber and the second chamber is the fifth partition. Since the lower temperature molten metal flows from the first chamber into the intermediate chamber through the first flow port, it is difficult to flow upward toward the higher temperature second flow port. , Thermal convection is suppressed. Therefore, the heat convection between the first chamber and the second chamber is suitably suppressed in the intermediate chamber, and the inclusions in the second chamber can be prevented from being rolled up.

(6) In the configuration of (1) above, the furnace body includes a first furnace body that constitutes the first chamber, a second furnace body that constitutes the second chamber, and the intermediate chamber. In addition, a connecting pipe that connects the first furnace body and the second furnace body may be provided, and a meandering flow path that meanders the flow of the molten metal may be formed in the connecting pipe.
According to this configuration, the furnace body is configured by connecting the two furnace bodies with the connection pipe, and the meandering flow path formed in the connection pipe is the flow of the molten metal from the first furnace body to the second furnace body. Can be suppressed.

(7) It is preferable that the melting furnace is provided with a support member that supports the metal block at the upper position in the first chamber.
As a result, the temperature of the molten metal that has become low around the metal lump increases as the temperature flows downward in the first chamber, and the entire molten metal in the first chamber is quickly soaked. Therefore, precipitation of the compound resulting from the molten metal being held at a low temperature can be prevented. Moreover, since the metal lump does not sink down to the bottom of the furnace main body on which inclusions are deposited, the impact applied to the inclusions can be reduced.

(8) It is preferable that the melting furnace is provided with a stirring mechanism for stirring the molten metal in the first chamber.
As a result, the soaking of the molten metal in the first chamber can be further promoted.

[Details of the embodiment of the present invention]
Next, a melting furnace according to an embodiment of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic view showing a melting furnace according to the first embodiment of the present invention.
The melting furnace includes a furnace body 10 that heats and melts the charged ingot K and stores the molten metal Y. The furnace body 10 is formed in a substantially rectangular parallelepiped shape having a bottom wall 10a, front and rear walls 10b and 10c, side walls (not shown), and a furnace lid 10d.

  An ingot (metal lump) K, which is a metal material, is charged into the furnace body 10 by opening a part of the furnace lid 10d at one side of the furnace body 10 in the front-rear direction (left-right direction in FIG. 1). . A pump (suction device) P is provided at the upper end of the other side portion of the furnace body 10. The molten metal Y produced by melting the ingot K is sucked out by the pump P and supplied to the casting equipment or the like in the next process. In the present embodiment, the left side of FIG. 1 is the front side, and the right side is the rear side.

A plurality of partition walls 21 to 23 are provided inside the furnace body 10. And the inside of the furnace main body 10 is divided into three chambers 11-13 by these partition walls 21-23.
Specifically, a vertical wall (second partition wall) 22 extending in the vertical direction is provided at a substantially center in the front-rear direction of the furnace body 10. The upper end of the vertical wall 22 reaches the furnace lid 10d, and the lower end of the vertical wall 22 is disposed above the bottom wall 10a with a gap. An intake chamber (first chamber) 11 into which the ingot K is charged is formed on the front side of the vertical wall 22, and a discharge chamber (a first chamber) 11 from which the molten metal Y is sucked out by the pump P is formed on the rear side of the vertical wall 22. A second chamber 12 is formed.

An upper lateral wall (first partition wall) 21 extending in the front-rear direction is provided at the lower portion of the intake chamber 11. A region below the upper lateral wall 21 is an intermediate chamber 13. The intermediate chamber 13 is partitioned from the take-out chamber 12 by a vertical wall 22.
A lower lateral wall (third partition wall) 23 extending in the front-rear direction is provided below the upper lateral wall 21. The rear end portion of the lower horizontal wall 23 and the lower end portion of the vertical wall 22 are connected to each other. In addition, the front end portion of the lower lateral wall 23 is disposed behind the front wall 10b with a space therebetween.

  The space provided between the vertical wall 22 and the upper horizontal wall 21 is the first flow port 31, and the space provided between the vertical wall 22 and the bottom wall 10 a is the second flow port 32. Yes. And between the 1st circulation port 31 and the 2nd circulation port 32, the meandering flow path 14a which meanders in the front-back direction by being divided by the lower side wall 23 into the upper flow path 14a and the lower flow path 14b. , 14b are formed. The room having the meandering channels 14 a and 14 b constitutes the intermediate chamber 13.

  Therefore, the furnace body 10 of the present embodiment includes the intake chamber 11, the intermediate chamber 13, and the extraction chamber 12, and the flow paths 14 a and 14 b meandering in the intermediate chamber 13 between the intake chamber 11 and the extraction chamber 12. It is the structure connected via. In addition, each partition 21-23 is formed from the raw material which has heat insulation, The heat transfer through the partition 21-23 is suppressed.

  The intake chamber 11 is provided with a support base 42 that supports the charged ingot K at a position spaced above the upper lateral wall 21. The support base 42 can be formed from a wire mesh or the like. Then, the ingot K on the support base 42 is melted in the intake chamber 11, and the molten metal Y flows through the intermediate chamber 13 to the take-out chamber 12 and is sucked out by the pump P.

  Oxides generated when the molten metal Y and the ingot K in the furnace body 10 come into contact with the air, compounds precipitated from the molten metal Y (hereinafter also referred to as “inclusions”), and the like are submerged over time. Deposit on the bottom of the body 10. In the case of this embodiment, the inclusion A is deposited in the lower flow path 14 b in the intermediate chamber 13 and the bottom of the extraction chamber 12. Since this inclusion A is an impurity, if it is mixed in the cast material manufactured in the next step, it causes a reduction in quality. Therefore, the pump P is arranged at the upper part of the extraction chamber 12 so as not to suck out the inclusion A accumulated at the bottom of the extraction chamber 12.

  When the metal to be melted is a magnesium alloy, the molten metal Y is heated to, for example, about 650 ° C. to 700 ° C. inside the furnace body 10. On the other hand, the ingot K is preheated to about 150 ° C. to 350 ° C., for example. Therefore, when the ingot K is thrown into the intake chamber 11, the temperature of the molten metal Y around it falls. Therefore, in the intake chamber 11, thermal convection occurs between the low temperature molten metal Y around the ingot K supported by the support base 42 and the high temperature molten metal Y below the ingot K (see arrow a). Heat up.

  Since the meandering channels 14 a and 14 b are formed in the intermediate chamber 13, a sufficiently long interval is secured between the intake chamber 11 and the extraction chamber 12. Therefore, the heat convection generated in the intake chamber 11 does not easily reach the extraction chamber 12 and stays in the intermediate chamber 13, particularly in the upper flow path 14 a near the first circulation port 31. Therefore, it can suppress that the inclusion A deposited on the bottom part of the lower flow path 14b and the bottom part of the extraction chamber 12 is rolled up by the flow of the molten metal Y by heat convection. Therefore, it is possible to suitably prevent the inclusion A from being mixed into the molten metal Y sucked out from the pump P, and a high-quality cast material can be manufactured in the casting equipment in the next process.

  Moreover, although the molten metal Y is heated at a predetermined temperature in the furnace body 10, depending on the type of metal, when the molten metal Y is kept at a low temperature, a compound is deposited, which becomes an inclusion A. It may accumulate. In the present embodiment, since the ingot K is supported on the upper side of the intake chamber 11, the molten metal Y around the ingot K whose temperature has decreased is actively flowed downward, and thermal convection in the intake chamber 11 is promoted. Is done. Therefore, the molten metal Y can be quickly soaked in the intake chamber 11, and the precipitation of the compound due to the temperature of the molten metal Y can be suitably prevented.

  Moreover, since the intake chamber 11, the extraction chamber 12, and the intermediate chamber 13 are formed by providing a partition in the furnace main body 10, the structure of the furnace main body 10 is simplified and each chamber 11-13 is formed easily. can do. Moreover, since the meandering flow paths 14a and 14b are formed in the intermediate chamber 13 by the lower side wall 23, a flow path as long as possible can be formed using a small space in the furnace body 10, A long distance between the intake chamber 11 and the extraction chamber 12 can be secured.

  In the present embodiment, the support base 42 may be omitted, and the ingot K may be submerged in the entrance chamber 11. Even in this case, since the upper lateral wall 21 is disposed below the intake chamber 11, the ingot K does not sink directly into the inclusion A accumulated at the bottom of the intermediate chamber 13, and the interposition The roll-up of the object A can be prevented.

  Further, as shown by a two-dot chain line in FIG. 1, a weir member 41 may be separately provided in the take-out chamber 12. The dam member 41 includes a lower dam member 41A extending upward from the bottom wall 10a and an upper dam member 41B extending downward from the upper end of the furnace body 10, and is distributed between the lower dam member 41A and the upper dam member 41B. A mouth 41C is formed. By providing such a weir member 41, it is possible to more reliably suppress inclusions from being mixed into the molten metal Y sucked from the pump P.

As a comparative example, FIG. 4 shows a furnace body 101 of a melting furnace in which the intermediate chamber 13 is not provided and the dam member 41 as described above is provided between the intake chamber 11 and the extraction chamber 12. Further, the furnace body 101 is not provided with the support base 42 as in the above embodiment. In this comparative example, when the ingot K is put into the intake chamber 11, heat convection caused by a decrease in the temperature of the water furnace around the ingot K and when the ingot K sinks to the bottom of the furnace body 101. Due to the impact, the inclusion A in the intake chamber 11 winds up vigorously. Then, the flow reaches the take-out chamber 12 through the circulation port 41C of the weir member 41 and also winds up the inclusion A in the take-out chamber 12.
On the other hand, in the first embodiment shown in FIG. 1, the inclusion A in the take-out chamber 12 is compared with the comparative example in FIG. 4 due to the presence of the intermediate chamber 13 having the meandering channels 14a and 14b. Winding can be prevented satisfactorily.

(Second Embodiment)
FIG. 2 is a schematic view of a melting furnace according to the second embodiment of the present invention.
In the present embodiment, a front vertical wall (fourth partition wall) 24 and a rear vertical wall (fifth partition wall) 25 extending in the vertical direction are provided inside the furnace body 10. The upper end of the front vertical wall 24 reaches the furnace lid 10d, and the lower end of the front vertical wall 24 is disposed above the bottom wall 10a with a gap.
The rear vertical wall 25 is arranged behind the front vertical wall 24 with a space therebetween. The lower end of the rear vertical wall 25 reaches the bottom wall 10a, and the upper end of the rear vertical wall 25 is arranged below the furnace lid 10d with a gap.

  In the present embodiment, the intake chamber 11 is formed on the front side of the front vertical wall 24, the extraction chamber 12 is formed on the rear side of the rear vertical wall 25, and the intermediate chamber 13 is formed between the intake chamber 11 and the extraction chamber 12. Has been. A first flow port 31 is provided on the lower side of the front vertical wall 24 (between the front vertical wall 24 and the bottom wall 10a), and the upper side of the rear vertical wall 25 (the rear vertical wall 25 and the furnace lid 10d). The second circulation port 32 is provided in the middle).

Further, in the intake chamber 11, a support base 42 for supporting the ingot K above the input chamber 11 is provided as in the first embodiment. For example, the support base 42 may be attached to the surrounding front wall 10b or the side wall, or may be attached to the bottom wall 10a.
The intermediate chamber 13 of the present embodiment does not include a meandering flow path as in the first embodiment, but the first flow port 31 between the intake chamber 11 and the extraction chamber 12 is disposed at a lower position. The 2nd circulation port between is arranged in a higher position, and the 1st circulation port 31 and the 2nd circulation port 32 are arranged in the position shifted up and down.

  When the ingot K is put into the intake chamber 11, the molten metal Y having a low temperature around the ingot K flows downward due to thermal convection, and the temperature of the entire intake chamber 11 gradually becomes higher than the molten metal Y in the intermediate chamber 13 and the extraction chamber 12. Also gets cold. Then, the molten metal Y in the intake chamber 11 flows into the intermediate chamber 13 through the first circulation port 31 by heat convection, but does not rise to the upper side of the intermediate chamber 13 that becomes higher temperature by heat convection. Therefore, the flow of the molten metal Y due to the heat convection does not reach the take-out chamber 12, and the inclusion A in the take-out chamber 12 can be suitably prevented from being rolled up. The inclusion A deposited on the bottom of the intake chamber 11 is rolled up by the thermal convection in the intake chamber 11 (see arrow a) (see arrow b), but no thermal convection occurs in the intermediate chamber 13 as described above. Therefore, the winding up of the inclusion A in the intermediate chamber 13 is suppressed.

  FIG. 5 shows, as a comparative example, a furnace main body 102 in which a front vertical wall 24 ′ and a rear vertical wall 25 ′ are arranged in the opposite direction to the second embodiment. That is, in the furnace main body 102, the lower end of the front vertical wall 24 'reaches the bottom wall 10a, and the upper end of the front vertical wall 24' is disposed below the furnace lid 10d with a gap. Further, the upper end of the rear vertical wall 25 ′ reaches the furnace lid 10 d, and the lower end of the rear vertical wall 25 ′ is disposed above the bottom wall 10 a with a gap.

  When the front and rear vertical walls 24 ′ and 25 ′ are arranged in this way, the molten metal Y whose temperature has decreased around the ingot K flows downward in the intake chamber 11 and at the same time through the first circulation port 31 ′. Then, it also flows into the intermediate chamber 13, and heat convection occurs so as to flow downward in the intermediate chamber 13, and the flow also reaches the take-out chamber 12 through the second circulation port 32 ′. Therefore, the inclusion A deposited on the bottoms in the intermediate chamber 13 and the extraction chamber 12 rolls up, and the possibility that the inclusion A will be sucked out together with the molten metal Y from the pump P increases.

On the other hand, in the case of the second embodiment shown in FIG. 2, the thermal convection generated in the intake chamber 11 is intermediated even though the two vertical walls 24 and 25 are used as in the comparative example. Since it can stop in the chamber 13, the winding-up of the inclusion A in the extraction chamber 12 can be prevented suitably.
Moreover, in this embodiment, although the meandering flow path is not formed in the intermediate chamber 13, the molten Y from the intake chamber 11 to the extraction chamber 12 is devised by devising the arrangement of the two vertical walls 24, 25. The flow can be suitably suppressed. Therefore, it is possible to reduce the number of partition walls that define the inside of the furnace main body 10 while exhibiting substantially the same effects as the first embodiment, and the structure of the furnace main body 10 compared to the first embodiment. Simplification and cost reduction can be achieved.

  In this embodiment, the dam member 41 as described in the first embodiment may be provided in the extraction chamber 12.

(Third embodiment)
FIG. 3 is a schematic view of a melting furnace according to the third embodiment of the present invention.
In the melting furnace of the present embodiment, the first chamber 11 and the second chamber 12 constituting the furnace body 10 are configured as independent furnace bodies 10A and 10B. The intermediate chamber 13 is configured by a connecting pipe 10 </ b> C that connects the intake chamber 11 and the extraction chamber 12. A plurality of partition walls 26 and 27 are provided inside the intermediate chamber 13. These partition walls 26, 27 both extend in the up-down direction, the upper end is connected to the upper wall of the intermediate chamber 13, and the lower end is provided above the bottom wall with a space between the partition wall 26 and the intermediate chamber 13. The bottom wall is connected to the bottom wall, and the partition wall 27 having the top end spaced apart below the top wall is alternately arranged in the front-rear direction. A meandering flow path is formed in the intermediate chamber 13 by these partition walls 26 and 27. Further, a support base 42 for supporting the ingot K is provided in the intake chamber 11.

Therefore, in the present embodiment, even if the temperature of the molten metal Y decreases around the ingot K charged into the intake chamber 11 and flows downward, heat convection (see arrow a) occurs. Is alleviated by the flow path meandering in the intermediate chamber 13 and hardly reaches the take-out chamber 12. Therefore, it is possible to suitably suppress the winding of the inclusion A in the take-out chamber 12.
The connecting tube 10C may be a circular tube or a rectangular tube. Moreover, the number of the partition walls 26 and 27 can also be changed suitably.

With respect to the present invention, it should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is not meant to be described above, but is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
For example, the metal melted using the melting furnace of the present invention can be any metal that can cause the problem of inclusion A, including light metals (non-ferrous metals) such as magnesium alloys and aluminum alloys.

  Moreover, in each said embodiment, although the support stand (support member) 41 which supports the ingot K above the entrance chamber 11 was provided, this may be abbreviate | omitted. In this case, the inclusion A in the intake chamber 11 is easily rolled up by an impact when the ingot K sinks to the bottom of the intake chamber 11, but the flow to the extraction chamber 12 is suppressed by the presence of the intermediate chamber 13. Further, the winding up of the inclusion A in the take-out chamber 12 can be suitably prevented.

  Further, when the support base 42 is omitted, it is more preferable to provide a stirring mechanism (not shown) for stirring the molten metal Y in the intake chamber 11. If the ingot K sinks to the bottom of the intake chamber 11 without the support base 42, the molten metal Y having a low temperature around the ingot K becomes difficult to heat convection upward, but the inside of the intake chamber 11 is forced by the stirring mechanism. It is possible to suitably equalize the temperature in the intake chamber 11 by stirring. But even if it is a case where the support stand 42 is provided in the intake chamber 11, further soaking | uniform-heating can be achieved by providing a stirring mechanism further.

10: furnace main body 10a: bottom wall 10b: front wall 10c: rear wall 10d: furnace lid 11: intake chamber (first chamber)
12: Extraction room (second room)
13: Intermediate chamber 14a: Upper flow path (meandering flow path)
14b: Lower channel (meandering channel)
21: Upper side wall (first partition)
22: Vertical wall (second partition)
23: Lower side wall (third partition)
24: Front vertical wall (fourth partition wall)
24 ': front vertical wall 25: rear vertical wall (fifth partition wall)
25 ': Rear vertical wall 31: 1st flow port 31': 1st flow port 32: 2nd flow port 32 ': 2nd flow port 41: Weir member 41A: Lower dam member 41B: Upper dam member 41C: Flow port 42: Support stand (support member)
101: furnace body 102: furnace body A: inclusion K: ingot (metal lump)
P: Pump

Claims (5)

A melting furnace having a furnace body for melting a metal lump in a stored molten metal,
The furnace body is
A first chamber into which the metal mass is charged;
A second chamber from which molten metal is taken out for supply to the next process;
An intermediate chamber that is provided between the first chamber and the second chamber and suppresses thermal convection between the two chambers;
Equipped with a,
Each chamber is formed by partitioning the interior of the furnace body with a partition wall,
The intermediate chamber is disposed below the first chamber via a first partition extending in the horizontal direction,
The second chamber is disposed on a horizontal side of the first chamber and the intermediate chamber via a second partition wall extending in the vertical direction,
A first flow port is formed between the first partition and the second partition to circulate the first chamber and the intermediate chamber,
Between the second partition wall and the bottom wall of the furnace body, a second flow port for flowing the intermediate chamber and the second chamber is formed,
In the intermediate chamber, a third partition wall extending in a horizontal direction is provided, which forms a meandering channel that meanders the flow of the molten metal between the first circulation port and the second circulation port. . A melting furnace having a furnace body for melting a metal lump in a stored molten metal,
The furnace body is
A first chamber into which the metal mass is charged;
A second chamber from which molten metal is taken out for supply to the next process;
An intermediate chamber that is provided between the first chamber and the second chamber and suppresses thermal convection between the two chambers;
Equipped with a,
Each chamber is formed by partitioning the interior of the furnace body with a partition wall,
The first chamber, the intermediate chamber, and the second chamber are arranged side by side in the horizontal direction, and between the first chamber and the intermediate chamber and between the intermediate chamber and the second chamber, respectively. A fourth partition wall and a fifth partition wall extending in the vertical direction are provided;
A first flow port for flowing between the first chamber and the intermediate chamber is provided on the lower side of the fourth partition wall,
The melting furnace provided with the 2nd distribution port which distribute | circulates the said intermediate | middle chamber and the said 2nd chamber in the upper part side of the said 5th partition . A melting furnace having a furnace body for melting a metal lump in a stored molten metal,
The furnace body is
A first chamber into which the metal mass is charged;
A second chamber from which molten metal is taken out for supply to the next process;
An intermediate chamber that is provided between the first chamber and the second chamber and suppresses thermal convection between the two chambers;
Equipped with a,
The furnace body constitutes a first furnace body constituting the first chamber, a second furnace body constituting the second chamber, the intermediate chamber, and the first furnace body and the first A melting furnace comprising a connecting pipe for connecting the two furnace bodies, and a meandering flow path for meandering the flow of the molten metal is formed in the connecting pipe . The melting furnace of any one of Claims 1-3 in which the supporting member which supports a metal lump in the upper rank in the said 1st chamber is provided. The melting furnace according to any one of claims 1 to 4 , wherein a stirring mechanism for stirring the molten metal in the first chamber is provided.

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