JP6857149B2 - Metal melting furnace with agitator - Google Patents

Description

The present invention relates to a metal melting furnace in which a melting chamber and a pumping chamber are separated by a partition wall, an immersion heater as a heat source is arranged in the melting chamber, and a passage for sending the molten metal in the melting chamber to the pumping chamber is provided in the partition wall.

Some conventional metal melting furnaces do not have a stirring device for stirring the molten metal.
Although this metal melting furnace has a simple structure and a low manufacturing cost, it does not have a stirring device, so there is a problem that the heat transfer coefficient is small and the heat transfer efficiency is poor.

For this reason, as shown in FIGS. 5 and 6, the melting chamber is provided with a circulation pump 60 having a configuration in which the pump body 61 is housed in the housing 62, or an electromagnetic stirring device (for example, a patent). (See Document 1) is disclosed.
Since these melting furnaces can circulate or agitate the molten metal in the melting chamber, they have an advantage that they can be heated with high heat transfer efficiency.

Japanese Unexamined Patent Publication No. 2011-237056

However, since the metal melting furnace provided with the stirring pump in the melting chamber has a configuration in which the pump main body 61 is housed in the housing 62, the housing 62 and related members (for example, members required for mounting the housing 62) are required. ..
Therefore, there is a problem that the configuration becomes complicated and the manufacturing cost increases.

In addition, the metal melting furnace equipped with an electromagnetic agitator is inferior in heat insulation due to the limited thickness of the hearth material due to its structure, and also agitates the slag that accumulates on the hearth, so the quality of the molten metal There is a problem that it is easy to decrease. In addition, the configuration is naturally complicated.

Therefore, an object of the present invention is to provide a metal melting furnace which has a simple structure, a low manufacturing cost, and can provide a molten metal of excellent quality.

In order to achieve the above object, the metal melting furnace equipped with the stirring device of the present invention includes a furnace body (2) composed of a melting chamber (10), a pumping chamber (20) and a partition wall (30). The melting chamber (10) and the pumping chamber (20) are separated by a partition wall (30), an immersion heater (40) as a heat source is arranged in the melting chamber (10), and the melting chamber is placed in the partition wall (30). In the one provided with the passage (31) for sending the molten metal of (10) to the pumping chamber (20).
The lower surface of the passage (31), the lower surface of the melting chamber (10), and the lower surface of the pumping chamber (20) are all formed at the same height by the bottom wall (2a) of the furnace body (2).
A stirring device (50) having a rotating body (51) that rotates in the horizontal direction without providing a housing is provided in the vicinity of the immersion heater (40).
The passage (31) is provided below the rotating body (51) of the stirring device (50), and at a position facing the rotating body (51) of the stirring device (50) in the partition wall (30). Provide,
By rotating the rotating body (51) of the stirring device (50), the molten metal in the melting chamber (10) is stirred, and the surface of the immersion heater (40) and the material to be dissolved is subjected to heat transfer efficiency by a forced convection effect. It is characterized by increasing.

Further, in the metal melting furnace (1) provided with the stirring device (50) of the present invention, one of the stirring devices (50) is provided, and the immersion heater (40) is used as a rotating body of the stirring device (50). It is characterized in that it is placed in the flow field of the molten metal generated by (51).

It is characterized in that four immersion heaters (40) are arranged in a quadrangle, and the stirring device (50) is arranged in the center of the quadrangle .

The symbols in parentheses indicate the corresponding elements or corresponding items described in the drawings and the mode for carrying out the invention described later.

According to the metal melting furnace provided with the stirring device of the present invention, since the stirring device is provided in the vicinity of the immersion heater without particularly providing a housing, the configuration of the metal melting furnace can be simplified. , The manufacturing cost can be suppressed to a low price.

Further, since the molten metal in the melting chamber is sent to the pumping chamber through the passage by the mechanism of rotating the rotating body of the stirring device in the horizontal direction, the configuration of the metal melting furnace can be further simplified. Therefore, the manufacturing cost can be suppressed to a low price.

Further, according to the metal melting furnace provided with the stirring device of the present invention, one stirring device is provided and the immersion heater is arranged in the flow field where the rotating body of the stirring device is generated. The molten metal can be heated efficiently.

Further, according to the metal melting furnace provided with the stirring device of the present invention, since the passage is provided below the rotating body of the stirring device, the molten metal that is agitated by the rotating body and forms a steep flow once hits the partition wall and is gentle. After forming a smooth flow, it reaches the pumping chamber through the passage. Therefore, the molten metal that has reached the pumping chamber forms a gentle flow there, so that it is possible to provide a molten metal having excellent quality. By the way, if the flow of the molten metal in the pumping chamber is steep, the oxides and slag of the molten metal are involved, and the quality of the molten metal deteriorates. Thereby, the metal melting furnace of the present invention can provide a molten metal having excellent quality.

It is a schematic plan view which shows the metal melting furnace provided with the stirring apparatus which concerns on embodiment of this invention. It is a schematic side view of the metal melting furnace shown in FIG. It is a partially enlarged view of the metal melting furnace shown in FIG. It is a partially enlarged view of the metal melting furnace shown in FIG. It is a side sectional view which shows the metal melting furnace which concerns on a prior art example. It is a partially enlarged view of the metal melting furnace shown in FIG.

The metal melting furnace 1 provided with the stirring device 50 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic plan sectional view of a metal melting furnace 1 provided with a stirring device 50 according to an embodiment of the present invention. FIG. 2 is a schematic side sectional view thereof, and FIG. 3 is a partially enlarged view thereof.

The metal melting furnace 1 provided with the stirring device 50 according to the present embodiment is used to melt a non-ferrous metal such as an aluminum alloy into a molten metal as a pre-process for manufacturing a cast product such as die casting, for example. Can be done.

The metal melting furnace 1 includes a furnace main body 2, and the furnace main body 2 is composed of a melting chamber 10, a pumping chamber 20, and a partition wall 30 that separates the two. Further, substantially half of the melting chamber 10 is a heating region 11, and in the heating region 11, four immersion heaters (electric heaters) 40, which are heat sources, and four virtual lines L1, L2, L3 connecting them are connected. L4s are arranged at equal intervals so as to form a virtual quadrangle S (see FIG. 3).

Further, the four immersion heaters 40 are arranged so that the virtual quadrangle S formed by the four virtual lines L1, L2, L3, and L4 is located in the central portion of the heating region 11. That is, the first distance D1 between the first virtual line L1 and the first side wall 2b of the furnace body 2 of the four virtual lines, the second distance D2 between the second virtual line L2 and the partition wall 30, and the second The third virtual line L3 and the second side wall 2c are arranged so that the third distance D3 is substantially equal to each other.

Then, one stirring device 50 is arranged at the center of the virtual quadrangle S and in the vicinity of the four immersion heaters 40.

The rotation direction of the rotating body 51 of the present embodiment is set to the clockwise direction, but conversely, it can be rotated in the counterclockwise direction. Further, by alternately rotating the molten metal in both the clockwise direction and the counterclockwise direction for a certain period of time, the molten metal in the melting furnace can be heated evenly. Further, the rotating body 51 can have an uneven surface formed on the surface thereof to increase the resistance to the molten metal and increase the stirring power.

Further, the rotating body 51 has a simple shape having a substantially circular plane shape, and by eliminating the need for a complicated blade shape or the like, it is possible to further reduce the ease of molding and the manufacturing cost. Further, the portion of the stirring device 50 located in the melting chamber, including the rotating body 51, is not housed in the housing as in the prior art, and is therefore arranged in a state of being exposed to the molten metal in the melting chamber. As a result, the rotational force of the rotating body 51 is effectively applied to the molten metal.

Further, the partition wall 30 is provided with a passage 31 for sending the molten metal of the melting chamber 10 to the pumping chamber 20. The passage 31 is arranged below the rotating body 51 of the stirring device 50 in a side view, and the lower surface thereof is formed by the bottom wall 2a of the furnace body 2. Further, the passage 31 is arranged at a position facing the rotating body 51 of the stirring device 50 in a plan view. The width of the passage 31 is not limited, but it is preferably set to be substantially equal to or larger than the outer diameter of the rotating body 51 so that the molten metal can easily pass through.

The remaining substantially half of the melting chamber except the heating region 11 is a preheating region 12 in which the immersion heater 40 and the stirring device 50 are not arranged, and a metal material (material to be dissolved) to be melted is put into this region to heat the region. The heat from the molten metal of No. 11 brings the charged metal material into at least a semi-dissolved state.

The metal melting furnace 1 provided with the stirring device 50 according to the present embodiment can be operated as follows. First, the metal material charged into the melting chamber 10 is heated by four immersion heaters 40 to form a molten metal. Since the four immersion heaters 40 are arranged so as to be located in the flow field generated by the stirring device 50, the molten metal in the heating region 11 can be uniformly heated. Further, at this time, since the molten metal can be agitated by the rotational force generated by rotating the rotating body 51 of the stirring device 50 in the horizontal direction, the molten metal in the heating region 11 can be uniformly heated.

The molten metal uniformly heated in the heating region 11 flows to the pumping chamber 20 through the passage 31. At this time, since the passage 31 is arranged below the rotating body 51 in the side view, the sudden flow of the molten metal generated by the rotating body 51 is weakened by hitting the partition wall 30, and then passes through the passage 31. It is sent to the pumping room 20. Therefore, it is possible to prevent a sudden flow of molten metal from occurring in the pumping chamber 20.

Incidentally, as shown in FIG. 4, when the bottom surface 31a of the passage 31 is formed by providing an erection portion P (or a portion corresponding to the lower end portion of the partition wall 30) erected from the bottom wall 2a, the erection portion P may be used. Among the constituents of the molten metal, those having a large specific gravity have a problem that the flow is blocked and the molten metal cannot pass through the passage 31 and accumulates in the melting chamber. In the present embodiment, such a problem can be avoided in advance.

According to the metal melting furnace 1 provided with the stirring device 50 according to the present embodiment described above, the metal melting furnace 1 is configured because the stirring device 50 not housed in the housing is provided in the vicinity of the immersion heater 40. Can be simplified. Therefore, the manufacturing cost can be suppressed to a low price.

Further, since one stirring device 50 is provided and the immersion heater 40 is arranged in the flow field of the molten metal generated by the rotating body 51 of the stirring device 50, the molten metal is efficiently heated by each immersion heater 40. be able to.

Further, since the passage 31 is provided below the rotating body 51 of the stirring device 50 in a side view, the molten metal that is agitated by the rotating body 51 and forms a steep flow once hits the partition wall 30 to form a gentle flow. In this state, the pumping chamber 20 can be reached through the passage 31. Therefore, the molten metal that has reached the pumping chamber 20 forms a gentle flow there, which facilitates the pumping operation. This also makes it possible to provide a molten metal having excellent quality.

The metal melting furnace 1 provided with the stirring device 50 according to the above embodiment is provided with four immersion heaters 40, but the present invention is not limited to this, and one or a plurality of immersion heaters 40 may be provided. Further, the stirring device 50 is not limited to one, and a plurality of stirring devices 50 may be provided.

Further, in the present embodiment, the four immersion heaters 40 are arranged so that the virtual quadrangle S formed by the four virtual lines L1, L2, L3, and L4 is located in the central portion of the heating region 11. The stirring device 50 is arranged at the center of the virtual quadrangle S, but the present invention is not limited to this, and the immersion heater 40 is located in the vicinity of the stirring device 50 and the flow of molten metal generated by the rotating body 51 of the stirring device 50. Anything placed in the hall will do. Further, although the description has been given by taking four immersion heaters 40 as an example, the number is not limited to the number of immersion heaters 40, and the number of immersion heaters 40 may be one.

1 Metal melting furnace 2 Furnace body 2a Bottom wall 2b First side wall 2c Second side wall 10 Melting room 11 Heating area 12 Preheating area 20 Pumping room 30 Partition 31 Passage 31a Bottom surface 40 Immersion heater 50 Stirrer 51 Rotating body 60 Circulation pump 61 Pump Main body 62 Housing S Virtual quadrangle L1 First virtual line L2 Second virtual line L3 Third virtual line L4 Fourth virtual line D1 First distance D2 Second distance D3 Third distance P Standing part

Claims (3)

A furnace body composed of a melting chamber, a pumping chamber and a partition wall is provided, the melting chamber and the pumping chamber are separated by a partition wall, an immersion heater as a heat source is arranged in the melting chamber, and the molten metal in the melting chamber is placed in the partition wall. In a metal melting furnace provided with a passage for sending
The lower surface of the passage, the lower surface of the melting chamber, and the lower surface of the pumping chamber are all formed at the same height on the bottom wall of the furnace body.
A stirring device having a rotating body that rotates in the horizontal direction without providing a housing is provided in the vicinity of the immersion heater.
The passage is provided below the rotating body of the stirring device and at a position facing the rotating body of the stirring device in the partition wall.
The stirring device is provided, characterized in that the molten metal in the melting chamber is agitated by rotating the rotating body of the stirring device, and the heat transfer efficiency is enhanced by the forced convection effect on the surfaces of the immersion heater and the material to be dissolved. Metal melting furnace. The metal melting furnace provided with the stirring device according to claim 1, wherein one stirring device is provided and the immersion heater is arranged in a flow field of molten metal generated by a rotating body of the stirring device. The metal melting furnace provided with the stirring device according to claim 1 or 2, wherein four immersion heaters are arranged in a quadrangle, and the stirring device is arranged in the center of the quadrangle.

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