JP4348165B2 - Rotary crucible furnace - Google Patents

Description

  The present invention relates to a rotary crucible furnace that is heated by a regenerative burner to melt metal.

Conventionally, a stationary crucible furnace in which a crucible is installed in a furnace body through a combustion space and a regenerative burner that heats the crucible by burning the furnace body in the combustion space is known (for example, a patent) Reference 1). Since such a crucible furnace uses a regenerative burner, the exhaust heat is collected in the heat storage material of the heat storage tank and the combustion air is preheated, so that it can be heated efficiently.
JP-A-10-54667

  By the way, in the case of a stationary crucible furnace, since it is inconvenient to take out the molten metal, there is a demand for adopting a structure of a rotary crucible furnace that is usually used for melting non-ferrous metals. However, when using a regenerative burner, a heat storage tank is loaded with a ball-shaped heat storage material, the heat storage tank and the combustion space of the furnace body are connected through a communication path, and exhaust heat is transferred to the heat storage material through the communication path. It can be collected. For this reason, when the furnace body is tilted in order to take out the molten metal, there is a problem that the ball-shaped heat storage material in the heat storage tank rolls down into the combustion space through the communication path. In order to prevent this, it is conceivable to provide a grid-like support member on the communication path side of the heat storage tank, but the exhaust gas from the combustion space is at a high temperature, the heat resistance of the support member, the strength at high temperatures There is a problem that the cost becomes high when a material that clears the restriction is used. In the case of a furnace for melting aluminum, the temperature of the exhaust gas is about 900 ° C., so there are materials that satisfy the above restrictions, but in the case of a furnace for melting copper, the temperature of the exhaust gas is about 1400 to 1500 ° C. There aren't many materials that can satisfy the constraints.

  The present invention was invented in view of the above-described conventional problems, and a rotary crucible furnace that can prevent the heat storage material from rolling down when the furnace body is tilted to take out the molten metal without using a support member. The issue is to provide.

  In order to solve the above problems, a rotary crucible furnace according to the present invention includes a crucible 3 provided in a furnace body 1 through a combustion space 2 and the furnace body 1 is burned in the combustion space 2 so that the crucible 3 is formed. The furnace body 1 is mounted so that the regenerative burner A to be heated is attached, and the opening of the crucible 3 is normally in an upright posture with the opening directly above and the opening of the crucible 3 is inclined to the side when the molten metal 4 is taken out. The regenerative burner A is supported so that it can be rotationally driven, and the heat storage tank 5 of the regenerative burner A is loaded with a ball-shaped heat storage material 6, and the furnace is connected to the communication path 7 that connects the heat storage tank 5 and the combustion space 2 in the furnace body 1. The detour part 8 located above the heat storage tank 5 is provided in a state where the body 1 is inclined to the maximum. Even if the furnace body 1 is tilted to take out the molten metal from the crucible 3, the heat storage material 6 does not cross the bypass portion 8, and no support member is used to prevent the heat storage material 6 from coming out of the heat storage tank 5 to the communication path 7. However, it is possible to prevent the heat storage material 6 from rolling into the combustion space 2 when the furnace body 1 is tilted. Therefore, a rotary crucible furnace using the regenerative burner A with high thermal efficiency can be realized easily and inexpensively.

  Further, the heat storage material in the heat storage tank 5 is such that the communication path 7 for communicating the heat storage tank 5 with the combustion space 2 in the furnace body 1 is higher than the upper surface of the ball-shaped heat storage material 6 even when the furnace body 1 is inclined to the maximum. It is also preferable that six unfilled portions 8 are provided. Also in this case, even if the furnace body 1 is tilted to take out the molten metal 4 from the crucible 3, the heat storage material 6 does not come out from the heat storage tank 5 due to the presence of the unfilled portion 9, and heat is stored from the heat storage tank 5 to the communication path 7. Even without using a support member that prevents the material 6 from coming out, the heat storage material 6 can be prevented from rolling into the combustion space 2 when the furnace body 1 is tilted.

  As described above, the present invention can prevent the heat storage material from rolling down when the furnace body is tilted in order to take out the molten metal without using a support member that prevents the heat storage material from flowing out from the heat storage tank to the communication path. There is an effect that a rotary crucible furnace using a regenerative burner with high thermal efficiency can be realized at low cost and easily.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  First, the basic structure of the rotary crucible furnace will be described with reference to FIGS. A crucible 3 is housed inside the furnace body 1 via a combustion space 2, and a pair of regenerative burners A are attached to the furnace body 1. The pair of regenerative burners A has a heat storage tank 5 filled with a burner body 10 and a heat storage material 6, respectively.

  The pair of regenerative burners A includes a burner body 10 facing the upper part of the combustion space 2 and a burner body 10 facing the lower part of the combustion space 2. Reference numeral 16 denotes a fuel supply path for supplying fuel to the burner body 10, and reference numeral 17 denotes a fuel switching valve. The heat storage tank 5 is integrally mounted below the lower surface of the furnace body 1, and the heat storage tank 5 is filled with a ball-shaped heat storage material 6. The upper surface side of the heat storage tank 5 and the combustion space 2 in the furnace body 1 are communicated with each other through a communication path 7. The end portions of the communication path 7 of the pair of regenerative burners A include those facing the upper portion of the combustion space 2 and those facing the lower portion of the combustion space 2. The lower surface side of the heat storage tank 5 communicates with the intake and exhaust blowers 12 via the switching valve device 11.

  The pair of regenerative burners A are alternately burned. When the upper burner body 10 burns, the lower burner body 10 burns downward so that a flame is formed in a spiral shape. When burning, it burns upward so that a flame is formed like a spiral. When one regenerative burner A burns, exhaust heat of exhaust gas is recovered in the heat storage material 6 of the other regenerative burner A, and combustion air when the other regenerative burner A burns next Used for preheating. As a result, exhaust heat can be recovered and burned efficiently.

  The furnace body 1 rotatably supports the side of the furnace body 1 on which the regenerative burner A is provided so that the upper end portion on the opposite side becomes the rotation shaft 13, and is rotatable up and down around the rotation shaft 13. It has become. The furnace body 1 is driven up and down by an up and down drive body 14 such as a jack that is driven up and down. Normally, the furnace body 1 is held in a lowered state as shown in FIG. 1 (b), and in this state, the opening of the crucible 3 is held in an upright posture facing directly upward. In this upright posture, the metal to be melted is put into the crucible 3, the regenerative burner A is burned, the crucible 3 is heated, and the metal in the crucible 3 is melted. When the molten metal 4 is taken out, the furnace body 1 is raised by the elevating drive body 14 and rotated around the rotating shaft 13 as shown in FIG. When the furnace body 1 is thus inclined, the molten metal 4 in the crucible 3 is caused to flow out through the take-out port 18, and the molten metal 4 is received by the fishing bottle 15. In order to take out all the molten metal 4 in the crucible 3, the furnace body 1 is inclined to a position where the furnace body 1 is rotated at an angle of about 95 ° at the maximum from the horizontal state.

  A rotary crucible furnace provided with the regenerative burner A is formed as described above. In the present invention, when the molten metal 4 is taken out by inclining the furnace body 1, the following structure is adopted. The upper part of the heat storage tank 5 filled with the heat storage material 6 and the combustion space 2 are communicated with each other through a communication path 7 located on the side opposite to the side where the rotary shaft 13 is located. Even in the state where the maximum inclination is made, a bypass 8 located above the heat storage tank 5 is provided in the communication path 7. When the furnace body 1 is in the upright posture, the heat storage tank 5 is also in the upright state as shown in FIG. When the furnace body 1 is tilted so that the furnace body 1 is rotated by 90 ° from this state, the heat storage tank 5 is also substantially horizontal. However, since the bypass path 8 is provided in the communication path 7, the heat storage material 6 is bypassed. The heat storage material 6 is prevented from rolling down into the combustion space 2 through the communication path 7 without crossing the path 8.

  In FIG. 4, when the heat storage tank 5 is filled with the heat storage material 6, the heat storage material 6 having a volume smaller than the internal volume of the heat storage tank 5 is filled, and the heat storage tank 5 is formed with an unfilled portion 9 that is not filled with the heat storage material 6. It is. When the furnace body 1 is in the upright posture, the heat storage tank 5 is also in the upright posture as shown in FIG. When the furnace body 1 is tilted so that the furnace body 1 is rotated by 90 ° from this state, the heat storage tank 5 is also horizontal as shown in FIG. 4B, but the upper end of the heat storage material 6 of the heat storage tank 5 is It does not become higher than the communication path 7, the heat storage material 6 does not enter the communication path 7 from the heat storage tank 5, and there is no possibility that the heat storage material 6 rolls down into the combustion space 2.

  By adopting the structure as described above so that the heat storage material 6 does not roll off, it is possible to cope without using a support member or the like, and it is possible to obtain a rotary crucible furnace with an inexpensive and simple structure.

It is a figure for demonstrating the structure of the rotary crucible furnace of this invention, Comprising: (a) is sectional drawing seen from the plane, (b) is sectional drawing seen from the front of an upright state. It is sectional drawing seen from the front of the state which is made to incline same as the above and the molten metal is taken out. It is sectional drawing seen from the front which shows an example of the principal part of this invention, (a) is an upright posture, (b) is an inclination posture. It is sectional drawing seen from the front which shows the other example of the principal part of this invention, Comprising: (a) is an upright attitude | position, (b) is an inclination attitude | position.

Explanation of symbols

A Regenerative burner
DESCRIPTION OF SYMBOLS 1 Furnace 2 Combustion space 3 Crucible 4 Molten metal 5 Thermal storage tank 6 Thermal storage material 7 Communication path 8 Detour

Claims (2)

The furnace body is equipped with a crucible through a combustion space, and a regenerative burner that heats the crucible by burning in the combustion space is mounted on the furnace body, and usually has an upright posture with the crucible opening facing directly above and When the molten metal is taken out, the furnace body is supported so that the opening of the crucible is inclined so as to be inclined to the side, and the heat storage tank of the regenerative burner is loaded with a ball-shaped heat storage material. A rotary crucible furnace characterized in that a bypass portion located above the heat storage tank is provided in a communication path for communicating with a combustion space in the furnace body in a state where the furnace body is inclined at a maximum. The furnace body is equipped with a crucible through a combustion space, and a regenerative burner that heats the crucible by burning in the combustion space is mounted on the furnace body, and usually has an upright posture with the crucible opening facing directly above and When the molten metal is taken out, the furnace body is supported so that the opening of the crucible is inclined so as to be inclined to the side, and the heat storage tank of the regenerative burner is loaded with a ball-shaped heat storage material. The heat storage tank is provided with an unfilled portion of the heat storage material so that the communication path for communicating with the combustion space in the furnace body is higher than the upper surface of the ball-shaped heat storage material even when the furnace body is tilted to the maximum. Rotary crucible furnace.

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