A crucible-free double heat storage combustion energy-saving aluminum melting furnace

Abstract

The invention relates to the field of aluminum smelting, and discloses a crucible-free double-heat storage combustion energy-saving aluminum melting furnace, comprising a furnace body, an air inlet and outlet component and an output component, wherein the upper furnace opening of the furnace body is provided with a furnace cover, the lower furnace bottom is provided with an output pipe, the furnace cover is provided with a feed hole, an A port and a B port, the lower end surface of the furnace cover is provided with a plurality of burners, the plurality of burners are evenly divided into two parts and are respectively close to the A port and the B port, the air inlet and outlet component is used for supplying air to the burners and pulling the exhaust gas to be output outward, the output component comprises a gate column arranged in a lifting manner, the bottom of the gate column can be fitted with the furnace bottom, the gate column structure in the output component can realize the quantitative output of aluminum solution, and can also realize the conduction of flame heat to deeper aluminum raw materials, thereby improving the smelting efficiency, and can also greatly reduce the heat loss of the aluminum solution in the output process, and can also greatly improve the utilization of the exhaust gas heat.

Description

Technical Field

[0001] The invention relates to the field of metal smelting, specifically to the field of aluminum smelting, and in particular to a crucible-free double heat storage combustion energy-saving aluminum melting furnace. Background Art

[0002] In the aluminum smelting industry, aluminum melting furnaces include crucible type and crucibleless type. The crucible type refers to heating from the side and bottom of the aluminum melting furnace, and the crucibleless type refers to using a high-temperature flame to directly heat the aluminum charge inside the aluminum melting furnace. The double regenerative high-temperature air combustion technology is a heating technology used in crucibleless aluminum melting furnaces. Specifically, when the fuel is burning, the combustion air enters from port A, and the high-temperature flue gas is discharged from port B and the heat is accumulated in the heat storage body in the heat storage chamber B. After a preset time, the combustion air enters from port B after heat exchange in the heat storage chamber B, and the high-temperature exhaust gas is discharged from port A and the heat is accumulated in the heat storage body in the heat storage chamber A. This reciprocating process recovers the heat in the high-temperature exhaust gas to achieve energy saving. However, this method has some shortcomings: there is heat exchange between the heat storage body and the high-temperature flue gas, and the heat utilization rate in the high-temperature exhaust gas is relatively poor, and the high-temperature flue gas cannot be fully utilized, which needs to be improved.

[0003] In addition, in the prior art, after smelting, there are two common ways to output the molten aluminum in the smelting furnace. One is to scoop the molten aluminum directly from the furnace mouth of the smelting furnace; the other is to tilt the smelting furnace and pour the molten aluminum out. No matter which method is used, there are some shortcomings: during the output of the molten aluminum, the molten aluminum comes into contact with the outside air, resulting in heat loss and temperature drop, which is not conducive to subsequent utilization; the molten aluminum is used to manufacture various workpieces after output, so the quantitative amount needs to be considered when utilizing the molten aluminum. The above two methods can only realize the output of the molten aluminum, but cannot realize the quantitative output of the molten aluminum. Therefore, during the period from the output of the molten aluminum to the utilization of the molten aluminum, the molten aluminum needs to be quantitatively distributed. The longer this period is delayed, the more serious the heat loss of the molten aluminum, and the more unfavorable it is for the subsequent utilization of the molten aluminum; the risk is relatively high; all of these need to be improved.

[0004] Based on the above, the present invention proposes a crucible-free dual heat storage combustion energy-saving aluminum melting furnace. Summary of the invention

[0005] In order to solve the problems mentioned in the above background, the present invention provides a crucible-free double heat storage combustion energy-saving aluminum melting furnace.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0007] A crucible-free double heat storage combustion energy-saving aluminum melting furnace comprises a furnace body, an upper furnace opening of the furnace body is provided with a furnace cover, a feed hole, an A port and a B port are provided on the furnace cover, a feed pipe extends from the orifice of the feed hole, an output pipe is provided at the lower furnace bottom of the furnace body, and a plurality of burners are provided on the lower end surface of the furnace cover, and the plurality of burners are evenly divided into two parts and are respectively close to the A port and the B port;

[0008] The aluminum melting furnace also includes an air inlet and outlet component and an output component. The air inlet and outlet component is used to supply air to the burner and to draw the exhaust gas out. During the air supply and exhaust gas output, heat exchange between the air and the exhaust gas can be achieved. The output component is used to draw the aluminum solution in the furnace body to be quantitatively output outward through the output pipe. During the quantitative output process, the aluminum solution can be kept warm.

[0009] As a further improvement and optimization of the present invention, the air inlet and outlet components include a blower, an induced draft fan, a heat storage chamber, an exhaust chamber and a four-way reversing valve, and the four-way reversing valve includes four interfaces;

[0010] The upper end of the heat storage chamber is provided with a connecting pipe 1, the lower end is provided with a connecting pipe 2, and a heat storage ball is provided inside. There are two heat storage chambers, and the connecting pipes 1 on the two heat storage chambers are connected to the A port and the B port respectively;

[0011] The exhaust chamber comprises an outer casing made of a heat insulating material and an inner pipe located in the outer casing and made of a heat conducting material, wherein the upper end of the inner pipe is connected to the induced draft fan and the lower end is provided with a connecting pipe 3;

[0012] The blower, the connecting pipe three and the connecting pipes two of the two heat storage chambers are respectively connected to the four interfaces of the four-way reversing valve.

[0013] As a further improvement and optimization of the present invention, the inner pipe is in the shape of a spiral pipe, and a plurality of fins are distributed in an array on the inner wall of the inner pipe.

[0014] As a further improvement and optimization of the present invention, a nozzle is provided at the lower end of the outer cover shell, the nozzle is connected to the air compressor, a lower valve is provided on the nozzle, and an air pipe is connected to the upper end of the outer cover shell and an upper valve is provided at the connection.

[0015] As a further improvement and optimization of the present invention, the output component includes an upper bracket arranged on the upper end surface of the furnace cover, the end surface of the furnace cover is coaxially provided with a sleeve hole, a gate column is coaxially sleeved in the sleeve hole, the upper and lower ends of the gate column are open, initially, the lower open end of the gate column is in contact with the bottom of the furnace body, the upper open end of the gate column extends out of the furnace body and is provided with a joint, the joint is connected to the air pipe, and a linear module for driving the gate column to move in a vertical direction is provided on the upper bracket.

[0016] As a further improvement and optimization of the present invention, a vertically arranged guide rod is provided on the upper end surface of the furnace cover, and a lug extends externally from the upper end of the gate column, and the lug is slidably connected to the guide rod.

[0017] As a further improvement and optimization of the present invention, a lug extends externally from the upper end of the gate column, the output shaft of the linear module passes through a through hole arranged on the lug, a limiting ring is arranged at the bottom of the output shaft of the linear module, and a shoulder located above the lug is also arranged on the outside of the output shaft, and a spring located between the shoulder and the lug is sleeved on the outside of the output shaft.

[0018] As a further improvement and optimization of the present invention, the lower furnace bottom of the furnace body is in a conical shape with a horizontal cross-sectional area increasing from bottom to top, and the bottom of the gate column is in an arc shape matching the lower furnace bottom.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The gate column structure in this scheme can realize the quantitative output of aluminum solution, and can also transfer the flame heat to the deeper aluminum raw materials, improve the smelting efficiency, and can also greatly reduce the heat loss of aluminum solution in the output process, and can also greatly improve the utilization of waste gas heat, further:

[0021] During the smelting process of aluminum raw materials, the gate column falls down, and its lower open end fits tightly with the furnace bottom. The gate column itself is made of a material with good thermal conductivity and high temperature resistance. Therefore, during this process, after the flame contacts the aluminum raw materials downward, the flame will spread to the surroundings and burn the gate column at the same time. The gate column is equivalent to being inserted into the aluminum raw materials. Therefore, it can conduct the heat of the flame to the deeper layers of the aluminum raw materials, thereby improving the smelting efficiency.

[0022] During the output of aluminum solution, air medium is used as the output medium to push the aluminum solution out. On the one hand, during the smelting process of aluminum raw materials, the inside of the gate column will be in a high-temperature environment. When the exhaust gas is output, heat exchange occurs with the compressed air in the outer cover until the temperature rises, thereby improving the heat utilization of the exhaust gas. On the other hand, the aluminum solution in the furnace body continuously exchanges heat with the air in the gate column. The two cooperate to keep the air medium in a high-temperature environment, thereby achieving the insulation of the aluminum solution. In addition, except for contact with the high-temperature air medium, the aluminum solution has no other heat exchange with the outside world, thereby greatly reducing the heat loss of the aluminum solution during the output process.

[0023] In addition, when the aluminum solution does not need to be discharged temporarily and needs to be kept in the furnace for a period of time, since the gate column is inserted in the aluminum solution, it can be used as a heat conduction medium to make the temperature of each part of the aluminum solution more balanced and improve the insulation effect;

[0024] In addition, during the insulation process, since the furnace bottom is in a conical shape, under the condition of equal amount of aluminum solution, the conical furnace bottom can make the vertical projection distance of the aluminum solution in the furnace body larger than that of the flat furnace bottom. Therefore, the contact area between the aluminum solution and the gate column is larger. During insulation, the temperature balance effect of each part of the aluminum solution can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0026] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0027] Figure 3 Schematic diagram of air inlet and outlet components Figure 1 ;

[0028] Figure 4 Schematic diagram of air inlet and outlet components Figure 2 ;

[0029] Figure 5 It is a schematic diagram of a four-way reversing valve;

[0030] Figure 6 is a cross-sectional view of the exhaust chamber;

[0031] Figure 7 is a schematic diagram of a furnace body and output components;

[0032] Figure 8 Schematic diagram of furnace cover and output components Figure 1 ;

[0033] Fig. 9 Schematic diagram of furnace cover and output components Figure 2 .

[0034] The reference numerals in the accompanying drawings are:

[0035] 100, furnace body; 101, furnace cover; 1011, feed hole; 1012, A port; 1013, B port; 102, output pipe; 103, feed pipe; 104, burner; 200, air inlet and outlet components; 201, blower; 202, induced draft fan; 203, heat storage chamber; 204, exhaust chamber; 2041, outer cover shell; 2042, inner pipeline; 205, connecting pipe one; 206, connecting pipe two; 207, connecting pipe three; 208, four-way reversing valve; 300, output component; 301, air pipe; 302, upper valve; 303, lower valve; 304, upper bracket; 305, gate column; 306, linear module; 307, spring; 308, guide rod; 309, lug; 400, insulation shell. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0037] Reference Figure 1-Figure 9 A crucible-free double heat storage combustion energy-saving aluminum melting furnace includes a furnace body 100. The upper furnace mouth of the furnace body 100 is provided with a furnace cover 101, and the lower furnace bottom is provided with an output pipe 102. The furnace cover 101 is provided with a feed hole 1011, an A port 1012 and a B port 1013. A feed pipe 103 extends from the orifice of the feed hole 1011. Aluminum raw materials are fed into the furnace body 100 through the feed pipe 103. A plurality of burners 104 are provided on the lower end surface of the furnace cover 101. The plurality of burners 104 are evenly divided into two parts and are respectively close to the A port 1012 and the B port 1013. The burner 104 uses fuel for flame combustion, which can be realized by the existing technology and is not described in detail.

[0038] The aluminum melting furnace also includes an air inlet and outlet component 200 and an output component 300, wherein the air inlet and outlet component 200 is used to supply air to the burner 104 and to draw the exhaust gas outward. In this process, heat exchange between air and exhaust gas can be achieved to achieve energy saving. The output component 300 is used to draw the aluminum solution in the furnace body 100 to be quantitatively output outward through the output pipe 102. During the output process, the aluminum solution can be kept warm and the heat loss of the aluminum solution can be greatly reduced.

[0039] Furthermore, in the present application, the inner lining of the furnace body 100 is surrounded by stainless steel, and the casting material is a non-stick aluminum casting material.

[0040] Inlet and outlet gas components 200:

[0041] Reference Figure 2-Figure 6 The air inlet and outlet components 200 include a blower 201, an induced draft fan 202, a heat storage chamber 203, an exhaust chamber 204, and a four-way reversing valve 208, wherein the four-way reversing valve 208 has four interfaces, the four interfaces are connected in pairs and the connection relationship can be switched, for example, referring to Figure 5 The four-way reversing valve 208 includes a valve housing, and four interfaces are arranged in an array along the circumferential direction on the outer circumferential surface of the valve housing. A partition is arranged in the valve housing to enable the four interfaces to be connected in pairs. When the partition is driven by a motor to rotate, the connection relationship of the interfaces can be changed. This can be achieved with the existing technology and will not be elaborated on.

[0042] The upper end of the heat storage chamber 203 is provided with a connecting pipe 1 205, the lower end is provided with a connecting pipe 206, and a heat storage ball is provided inside. The heat storage chamber 203 is provided with two, namely, the heat storage chamber A and the heat storage chamber B, wherein the connecting pipe 1 205 of the heat storage chamber A is connected to the A port 1012, and the connecting pipe 1 205 of the heat storage chamber B is connected to the B port 1013.

[0043] The exhaust chamber 204 includes an outer cover shell 2041 and an inner pipe 2042 located in the outer cover shell 2041. Furthermore, the inner pipe 2042 is made of a heat-conducting material, and a plurality of fins are distributed in an internal array. The outer cover shell 2041 is made of a heat-insulating material. The upper end of the inner pipe 2042 is connected to the induced draft fan 202, and a connecting pipe 3 207 is provided at the lower end.

[0044] The blower 201 , the connecting pipe 3 207 and the connecting pipe 2 206 of the two heat storage chambers 203 are respectively connected to the four interfaces of the four-way reversing valve 208 .

[0045] The working process of the air inlet and outlet component 200 is specifically as follows:

[0046] The burner 104 located near the A port 1012 is started, and the blower 201 is running, so that air enters the furnace body 100 through the four-way reversing valve 208, the regenerator A, and the A port 1012 to provide oxygen for the flame combustion. The high-temperature exhaust gas generated by the combustion is drawn by the induced draft fan 202 and output to the outside through the B port 1013, the regenerator B, the four-way reversing valve 208, the connecting pipe 3 207, and the inner pipe 2042. During the output process, the heat in the exhaust gas is stored in the heat storage ball in the regenerator B.

[0047] After the preset time, the four-way reversing valve 208 is started, the burner 104 near the A port 1012 is closed, and the burner 104 near the B port 1013 is started. At this time, the blower 201 is running, so that the air enters the furnace body 100 through the four-way reversing valve 208, the heat storage chamber B, and the B port 1013 to provide oxygen for the flame combustion. At the same time, the air exchanges heat with the heat storage balls in the heat storage chamber B, which achieves the purpose of heat storage and energy saving. The high-temperature exhaust gas generated by the combustion is drawn by the induced draft fan 202 and output to the outside through the A port 1012, the heat storage chamber A, the four-way reversing valve 208, the connecting pipe 3 207, and the inner pipe 2042. During the output process, the heat in the exhaust gas is stored in the heat storage balls in the heat storage chamber A.

[0048] After a preset time, the four-way reversing valve 208 is started again, and the flow trajectories of air and exhaust gas are alternated again, and this cycle is repeated to collect and utilize the heat of the high-temperature exhaust gas, thereby achieving the purpose of heat storage and energy saving.

[0049] In the above process, it should be noted that although part of the heat of the high-temperature exhaust gas is transferred to the heat storage ball, there is still a part left. Therefore, when the exhaust gas passes through the inner pipe 2042, heat exchange will also occur between the exhaust gas and the air in the outer cover shell 2041, that is, the temperature of the exhaust gas is further reduced. The air in the outer cover shell 2041 receives heat and the temperature will rise. The utilization method will be explained later. Furthermore, in order to improve the heat exchange efficiency between the air in the outer cover shell 2041 and the exhaust gas in the inner pipe 2042, the inner pipe 2042 can be set to a spiral pipe shape, and a number of fins can be distributed in an array in the inner pipe 2042. Of course, other technical means that can effectively improve the heat exchange efficiency are also possible. The spiral pipe shape is not shown in the figure.

[0050] Output component 300:

[0051] Reference Figure 3 and Figure 6 A nozzle is provided at the lower end of the outer cover shell 2041, which is connected to the air compressor. A lower valve 303 is provided on the nozzle. An air pipe 301 is connected to the upper end of the outer cover shell 2041 and an upper valve 302 is provided at the connection. Both the upper valve 302 and the lower valve 303 are existing valve technologies, such as solenoid valves. During the smelting process of aluminum raw materials, the lower valve 303 is opened, and a preset amount of compressed air is injected into the outer cover shell 2041 through the air compressor, and then the lower valve 303 is closed. After that, the exhaust gas transfers heat to the compressed air through heat exchange, causing its temperature to rise.

[0052] Reference Figure 7-Figure 9 The output component 300 includes an upper bracket 304 arranged on the upper end surface of the furnace cover 101 and a vertically arranged guide rod 308. The end surface of the furnace cover 101 is coaxially provided with a sleeve hole, and a gate column 305 is coaxially sleeved in the sleeve hole. The upper and lower ends of the gate column 305 are open. Initially, the lower open end of the gate column 305 is in contact with the bottom of the furnace body 100, and the upper open end of the gate column 305 extends out of the furnace body 100 and is provided with a joint, which is connected to the air pipe 301.

[0053] Furthermore, a lug 309 extends from the outside of the upper end of the gate column 305, and the lug 309 is slidably connected with the guide rod 308, so that the gate column 305 can and can only move in the vertical direction.

[0054] The upper bracket 304 is provided with a linear module 306 for driving the gate column 305 to move. The linear module 306 can be a hydraulic rod technology means, which will not be described in detail. For further information, refer to Figure 7 and Figure 8The output shaft of the linear module 306 passes through the through hole set on the lug 309, a limit ring is set at the bottom of the output shaft of the linear module 306, and a shoulder located above the lug 309 is also set on the outside of the output shaft, and a spring 307 located between the shoulder and the lug 309 is sleeved on the outside of the output shaft; its significance lies in that when the output shaft of the linear module 306 moves up, it can move up together with the lug 309 and the gate column 305 through the limit ring, and when the output shaft moves down, it moves down together with the gate column 305 through the spring 307. When the lower end of the gate column 305 is in contact with the bottom of the furnace body 100, the output shaft continues to move down by a preset distance, so that the spring 307 is compressed, and the gate column 305 is more closely in contact with the bottom of the furnace.

[0055] The working process of the output component 300 is specifically as follows:

[0056] During the smelting process of aluminum raw materials, the gate column 305 falls down, and its lower open end is tightly attached to the furnace bottom. The gate column 305 itself is made of a material with good thermal conductivity and high temperature resistance. Therefore, during this process, after the flame contacts the aluminum raw materials downward, the flame will spread to the surroundings and burn the gate column 305 at the same time. On the one hand, the gate column 305 is equivalent to being inserted into the aluminum raw materials, so it can conduct the heat of the flame to the aluminum raw materials at a deeper level, thereby improving the smelting efficiency; on the other hand, the inside of the gate column 305 is in a high temperature environment;

[0057] After the smelting is finished, the flame becomes smaller, and the gate column 305 is driven to move upward through the linear module 306. Since the upward movement distance of the gate column 305 is controllable, the gate column 305 is driven to move downward after a preset time. At this time, the amount of aluminum solution flowing into the gate column 305 is known, that is, the amount of aluminum solution flowing into the gate column 305 can be controlled. It should be noted that this part of the aluminum solution with a known amount will not only flow into the gate column 305, but also flow into the output pipe 102;

[0058] Then, the upper valve 302 is opened, and the high-temperature air in the outer cover shell 2041 will immediately flow into the gate column 305 through the air pipe 301, thereby pushing the aluminum solution in the gate column 305 to be output through the output pipe 102. Preferably, the end of the output pipe 102 can be directly connected to the aluminum solution utilization equipment, such as directly connected to the aluminum workpiece casting equipment. In this way, the output aluminum solution can be processed into those aluminum components at the first time without delay, and the heat loss is very small.

[0059] From the above description, we can see that:

[0060] The gate column structure in this scheme can realize the quantitative output of aluminum solution, and can also transfer the flame heat to the deeper aluminum raw materials, improve the smelting efficiency, and can also greatly reduce the heat loss of aluminum solution in the output process, and can also greatly improve the utilization of waste gas heat, further:

[0061] During the smelting process of aluminum raw materials, the gate column falls down, and its lower open end fits tightly with the furnace bottom. The gate column itself is made of a material with good thermal conductivity and high temperature resistance. Therefore, during this process, after the flame contacts the aluminum raw materials downward, the flame will spread to the surroundings and burn the gate column at the same time. The gate column is equivalent to being inserted into the aluminum raw materials. Therefore, it can conduct the heat of the flame to the deeper layers of the aluminum raw materials, thereby improving the smelting efficiency.

[0062] During the output of aluminum solution, air medium is used as the output medium to push the aluminum solution out. On the one hand, during the smelting process of aluminum raw materials, the inside of the gate column will be in a high-temperature environment. When the exhaust gas is output, heat exchange occurs with the compressed air in the outer cover until the temperature rises, thereby improving the heat utilization of the exhaust gas. On the other hand, the aluminum solution in the furnace body continuously exchanges heat with the air in the gate column. The two cooperate to keep the air medium in a high-temperature environment, thereby achieving the insulation of the aluminum solution. In addition, except for contact with the high-temperature air medium, the aluminum solution has no other heat exchange with the outside world, thereby greatly reducing the heat loss of the aluminum solution during the output process.

[0063] In addition, when the aluminum solution does not need to be discharged temporarily and needs to be kept in the furnace for a period of time, since the gate pillar is inserted in the aluminum solution, it can be used as a heat conduction medium to make the temperature of each part of the aluminum solution more balanced and improve the insulation effect.

[0064] Preferred embodiment, refer to Figure 7 and Fig. 9 The furnace bottom of the furnace body 100 is in a conical shape, and the bottom of the gate column 305 is also in a matching arc shape. Its significance lies in that, during the heat preservation process, since the furnace bottom is in a conical shape, under the condition of equal amount of aluminum solution, the conical furnace bottom can make the projection distance of the aluminum solution in the furnace body 100 in the vertical direction larger than that of the flat furnace bottom. Therefore, the contact area between the aluminum solution and the gate column 305 is larger. During heat preservation, the temperature balance effect of each part of the aluminum solution can be improved.

[0065] Preferred embodiment, refer to Figure 1 A heat-insulating shell 400 made of heat-insulating material can be installed on the outside of the smelting furnace to further improve the heat-insulating effect.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A crucible-free double heat storage combustion energy-saving aluminum melting furnace, comprising a furnace body (100), an upper furnace opening of the furnace body (100) is provided with a furnace cover (101), the furnace cover (101) is provided with a feed hole (1011), an A port (1012) and a B port (1013), a feed pipe (103) extends from the orifice of the feed hole (1011), and the characteristics are as follows: An output pipe (102) is provided at the lower furnace bottom of the furnace body (100), and a plurality of burners (104) are provided at the lower end surface of the furnace cover (101), wherein the plurality of burners (104) are evenly divided into two parts and are respectively close to port A (1012) and port B (1013); The aluminum melting furnace further comprises an air inlet and outlet component (200) and an output component (300). The air inlet and outlet component (200) is used to supply air to the burner (104) and to draw exhaust gas outward for output. During the process of supplying air and outputting exhaust gas, heat exchange between the air and the exhaust gas can be achieved. The output component (300) is used to draw aluminum solution in the furnace body (100) to be quantitatively output outward through the output pipe (102). During the quantitative output process, the aluminum solution can be kept warm. The air inlet and outlet components (200) include a blower (201), an induced draft fan (202), a heat storage chamber (203), an exhaust chamber (204), and a four-way reversing valve (208), wherein the four-way reversing valve (208) includes four interfaces; The upper end of the heat storage chamber (203) is provided with a connecting pipe 1 (205), the lower end is provided with a connecting pipe 2 (206), and a heat storage ball is provided inside. Two heat storage chambers (203) are provided, and the connecting pipes 1 (205) on the two heat storage chambers (203) are respectively connected to the A port (1012) and the B port (1013); The upper end of the exhaust chamber (204) is connected to the induced draft fan (202), and the lower end is provided with a connecting pipe 3 (207); The blower (201), the connecting pipe 3 (207) and the connecting pipe 2 (206) of the two heat storage chambers (203) are respectively connected to the four interfaces of the four-way reversing valve (208); The exhaust chamber (204) comprises an outer casing (2041) made of a heat insulating material and an inner pipe (2042) located inside the outer casing (2041) and made of a heat conductive material; the induced draft fan (202) is connected to the upper end of the inner pipe (2042); and a connecting pipe (207) is connected to the lower end of the inner pipe (2042); The lower end of the outer casing (2041) is provided with a nozzle, the nozzle is connected to the air compressor, a lower valve (303) is provided on the nozzle, and the upper end of the outer casing (2041) is connected to the air pipe (301) and an upper valve (302) is provided at the connection; The output component (300) comprises an upper bracket (304) arranged on the upper end surface of the furnace cover (101); a sleeve hole is coaxially formed on the end surface of the furnace cover (101); a gate column (305) is coaxially sleeved in the sleeve hole; the gate column (305) has openings at both upper and lower ends; initially, the lower open end of the gate column (305) is in contact with the furnace bottom of the furnace body (100); the upper open end of the gate column (305) extends out of the furnace body (100) and is provided with a joint, which is connected to the air pipe (301); and a linear module (306) for driving the gate column (305) to move in a vertical direction is provided on the upper bracket (304); A lug (309) extends from the outside of the upper end of the gate column (305), and the output shaft of the linear module (306) passes through a through hole set on the lug (309). A limit ring is set at the bottom of the output shaft of the linear module (306), and a shaft shoulder located above the lug (309) is also set on the outside of the output shaft. A spring (307) located between the shaft shoulder and the lug (309) is sleeved on the outside of the output shaft.

2. The crucible-free dual heat storage combustion energy-saving aluminum melting furnace according to claim 1 is characterized in that: The inner pipe (2042) is in the shape of a spiral pipe, and a plurality of fins are distributed in an array on the inner wall of the inner pipe (2042).

3. The crucible-free dual heat storage combustion energy-saving aluminum melting furnace according to claim 1 is characterized in that: A vertically arranged guide rod (308) is provided on the upper end surface of the furnace cover (101), and a lug (309) extends from the outside of the upper end of the gate column (305), and the lug (309) and the guide rod (308) are slidably connected.

4. The crucible-free dual heat storage combustion energy-saving aluminum melting furnace according to claim 1 is characterized in that: The lower furnace bottom of the furnace body (100) is in a conical shape with a horizontal cross-sectional area increasing from bottom to top, and the bottom of the gate column (305) is in an arc shape matching the lower furnace bottom.

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