An electrically heated circulation preheater

Abstract

The utility model provides a kind of electric heating circulation preheater, including soup bag body, soup bag body is equipped as the cavity of upper end opening, the upper end opening of soup bag body is connected with cover body, cover body and soup bag body are sealingly connected;Cover body is equipped with air inlet and air outlet, air inlet and air outlet are connected with gas heating system, gas heating system includes and the air inlet connection air inlet pipeline, and the air outlet connection air outlet pipeline, air inlet pipeline and air outlet pipeline are connected with electric heater;Air outlet pipeline middle is connected with fan;Cover body is equipped with telescopic air supply pipe away from air inlet pipeline side, telescopic air supply pipe and air inlet pipeline are communicated.Cover body is connected with electric push rod, electric push rod and telescopic air supply pipe lower end opening drive connection.The utility model ensures that soup bag body is evenly heated, avoids refractory material to crack damage due to uneven expansion, improves the service life of soup bag.

Description

Technical Field

[0001] This utility model belongs to the field of non-ferrous metal smelting, smelting and metal casting technology, and specifically relates to an electric heating circulating preheater. Background Technology

[0002] With the green transformation and upgrading of China's manufacturing industry and the requirements for sustainable development, reducing carbon emissions, energy consumption, and dependence on traditional petrochemical energy sources have become hot and urgent issues that the foundry industry needs to address. According to industry statistics, the molten metal transfer process between smelting and casting equipment in the non-ferrous metal foundry industry requires molten ladle. To prevent the molten metal from cooling down, the molten ladle needs insulation and heating. Currently, the industry practice is to use a burner preheating and insulation system, using the calorific value obtained from burning natural gas or liquefied petroleum gas to preheat and insulate the molten ladle. However, the exhaust gas generated after burning natural gas or liquefied petroleum gas cannot be directly discharged into the foundry workshop, requiring an additional exhaust gas recovery device, increasing equipment costs. The exhaust gas released into the atmosphere still contains a large amount of heat energy, resulting in energy waste. Furthermore, traditional preheaters are open, and the system is connected to the atmosphere, resulting in high oxygen content, which easily reacts with the molten metal, causing metal burn-off and damaging the refractory lining of the molten ladle, increasing the frequency and time of cleaning and maintenance, and reducing the service life of the molten ladle. Meanwhile, traditional preheaters have their heating source fixed at the top. When the soup dumplings are empty, they cannot move up and down inside, resulting in uneven heating and thermal vibration that damages the refractory lining and reduces the lifespan of the soup dumplings. When there is molten metal inside the soup dumplings, traditional preheaters cannot be immersed in the molten metal and automatically move up and down according to the liquid level. This is not conducive to heat conduction and temperature uniformity, and also causes the molten metal to be exposed to the atmosphere, resulting in hydrogen absorption and affecting product quality.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides an electric heating circulating preheater that uses electric energy heating to replace fuel combustion heating, thereby improving safety and environmental protection.

[0005] Technical Solution: To achieve the above objectives, this utility model provides an electric heating circulating preheater, including a soup dumpling body. The soup dumpling body is a cavity with an open top. A lid is connected to the open top of the soup dumpling body, and the lid and the soup dumpling body are sealed together. The lid has an air inlet and an air outlet, and a gas heating system is connected between the air inlet and the air outlet. The gas heating system includes an air inlet pipe connected to the air inlet and an air outlet pipe connected to the air outlet. An electric heater is connected between the air inlet pipe and the air outlet pipe. A fan is connected in the middle of the air outlet pipe. The fan draws gas from the soup dumpling body through the air outlet pipe and sends the gas to the electric heater for heating. A retractable air supply pipe is provided on the side of the lid away from the air inlet pipe, and the retractable air supply pipe is connected to the air inlet pipe. An electric push rod is connected to the lid, and the electric push rod is driven to move the lower opening of the retractable air supply pipe up and down. This invention is used for preheating and heat preservation of rotating soup dumplings. When the soup dumpling is empty, it needs to be preheated to prepare for holding and transporting molten aluminum. An electric push rod drives a retractable air supply pipe to move down to the bottom of the soup dumpling, activating the gas heating system. A fan draws gas from inside the soup dumpling through an outlet pipe and sends it to an electric heater for heating. The heated gas is then sent back into the retractable air supply pipe through an inlet pipe and sprayed into the soup dumpling from its lower opening, forming a circulation and preheating the soup dumpling. The hot air flows from bottom to top inside the soup dumpling, controlling the heating rate and ensuring even heating. Compared to traditional top heating, this avoids temperature gradients inside the soup dumpling, preventing uneven expansion of the refractory material and cracking damage, thus improving the service life of the rotating soup dumpling. During the rotation process, the outlet of the retractable air supply pipe is positioned above the molten metal, blowing in medium to low-temperature hot air to maintain the temperature of the soup dumpling and prevent excessive heat loss. This invention uses a gas heating system to heat the soup dumpling body and a retractable air inlet height to adjust the heat of the air inlet, ensuring that the soup dumpling body is heated evenly, preventing the refractory material from cracking and being damaged due to uneven expansion, and improving the service life of the soup dumpling.

[0006] Furthermore, in the aforementioned electric heating circulating preheater, the air outlet duct is connected to an inert gas supply system via a pipe. The inert gas supply system is connected to the air outlet duct between the fan and the electric heater via a pipe. The inert gas supply system includes an inert gas storage tank, a solenoid valve, and an inlet pipe. The solenoid valve controls the on / off switch of the inert gas supply system. When the solenoid valve is open, the inert gas supply system supplies gas to the air outlet duct. After being heated by the electric heater, the inert gas is sent into the soup dumpling body, replacing the air inside the soup dumpling body and the pipe, preventing aluminum molten metal oxidation and improving the quality of the aluminum molten metal.

[0007] Furthermore, in the aforementioned electrically heated circulating preheater, a flow control valve is installed at the connection point between the inert gas supply system and the outlet duct. A pressure sensor is installed between the flow control valve and the outlet duct. The flow control valve and the pressure sensor are electrically connected, and the flow control valve controls the gas flow rate based on the data detected by the pressure sensor. The flow control valve, in conjunction with the pressure sensor, automatically adjusts the system pressure, maintains a low-pressure environment, prevents external air from entering, and prevents oxidation of the molten aluminum.

[0008] Furthermore, in the aforementioned electric heating circulating preheater, a sealing groove is provided on the side of the lid near the soup dumpling body, and a sealing strip is installed in the sealing groove. The soup dumpling body and the lid are sealed together by the sealing strip. The sealing strip design ensures a seal between the lid and the soup dumpling body, and ensures the airtightness of the inert gas circulation.

[0009] Furthermore, in the aforementioned electrically heated circulating preheater, the retractable air supply pipe includes an upper flange, a middle pipe, and a lower flange. The upper flange and the middle pipe slide coaxially, the middle pipe and the lower flange are coaxially slidably connected, and the upper flange is connected to the cover flange. An electric push rod is connected to the lower flange, driving the lower flange to move up and down. The upper flange, middle pipe, lower flange, and the electric push rod drive rod are made of high-temperature resistant material, preferably Al2O3 coated stainless steel pipe. The electric push rod, except for the drive rod portion, is preferably made of 0S stainless steel. The electric push rod drives the lower flange to rise and fall, adjusting its height and even allowing it to briefly extend below the liquid surface to blow inert gas (such as argon or nitrogen) into the molten aluminum, refining the aluminum with inert gas and improving its quality.

[0010] Furthermore, in the aforementioned electrically heated circulating preheater, a hot air plate is connected to the end of the lower flange furthest from the upper flange. The hot air plate is a hollow cylinder, and through holes are provided on its sidewalls and bottom. These through holes are arranged in an array around the sidewalls and bottom of the hot air plate. Inert gas is blown through the through holes in the hot air plate array, optimizing heat diffusion and improving refining efficiency.

[0011] Furthermore, in the aforementioned electric heating circulating preheater, the cover includes an upper circular cover plate and a lower circular cover plate. The outer side of the upper circular cover plate is provided with a folded edge, and the lower circular cover plate is connected to the bottom of the folded edge. The upper and lower circular cover plates are spaced apart to form a flow guide cavity. The lower circular cover plate has flow guide holes arranged in an array around its center. The upper circular cover plate has a first through hole connected to the air outlet duct. The upper circular cover plate has a second through hole, and the lower circular cover plate has a third through hole. The second and third through holes are coaxially arranged, and the air inlet duct passes through the second through hole and is connected to the upper side of the third through hole on the lower circular cover plate. A retractable air supply duct is connected to the lower side of the third through hole on the lower circular cover plate. A sealing groove is provided on the side of the lower circular cover plate away from the upper circular cover plate. A flow guide cavity is formed between the upper and lower circular cover plates. When the fan starts, a negative pressure is formed in the flow guide cavity, and hot air enters the flow guide cavity evenly from the flow guide holes and then enters the air outlet duct, optimizing gas distribution and reducing air pressure fluctuations. The lower round cover plate can prevent molten aluminum from entering the air outlet duct and avoid damage to the air outlet duct.

[0012] Furthermore, in the aforementioned electrically heated circulating preheater, a liquid level detection device is connected to the top of the upper circular cover plate. The detection part of the liquid level detection device passes through the lower circular cover plate and detects the liquid level inside the soup pot body through a through-hole. The liquid level detection device is an infrared sensor. The device detects the liquid level and transmits the detected signal to the control system. Based on the detection signal, the control system controls an electric push rod to move the lower flange head, ensuring the hot air coil is immersed in the molten aluminum and ensuring the inert gas refining effect.

[0013] Furthermore, in the aforementioned electric heating circulating preheater, thermocouples are connected to both the inlet and outlet air ducts. These thermocouples are electrically connected to a PID temperature controller, which in turn is electrically connected to the electric heater. The PID temperature controller controls the heating power of the electric heater based on the thermocouple data. The thermocouple in the inlet air duct detects the temperature of the gas supplied to the soup dumpling body, while the thermocouple in the outlet air duct detects the temperature of the gas heated by the electric heater. The PID temperature controller adjusts the heating power of the electric heater in real time based on the temperature detected by the thermocouples, achieving precise temperature control and ensuring a stable internal temperature for the soup dumpling body.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: The electric heating circulating preheater of this utility model heats the soup dumpling body through a gas heating system, and adjusts the height of the air inlet through a retractable air supply pipe, ensuring uniform heating of the soup dumpling body and preventing cracking and damage to the refractory material due to uneven expansion, thus improving the service life of the soup dumpling. An inert gas supply system switch is installed to replace the air inside the soup dumpling body and the pipes, preventing aluminum molten metal oxidation and improving the quality of the aluminum molten metal. An electric push rod drives the lower flange head to rise and fall, adjusting the height of the lower flange head, and even allowing it to be briefly inserted below the liquid surface to blow inert gas (such as argon or nitrogen) into the aluminum molten metal for inert gas refining, thereby improving the quality of the aluminum molten metal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the electric heating circulating preheater of this utility model;

[0016] Figure 2 This is a schematic diagram of the retractable air supply duct structure;

[0017] Figure 3 This is a schematic diagram of the structure of the cover.

[0018] In the diagram: 1. Soup dumpling body; 2. Lid; 21. Air inlet; 22. Air outlet; 23. Upper round cover plate; 231. Folded edge; 232. First through hole; 233. Second through hole; 24. Lower round cover plate; 241. Guide hole; 242. Third through hole; 25. Liquid level detection device; 26. Sealing strip; 31. Air inlet pipe; 32. Air outlet pipe; 33. Electric heater; 34. Fan; 35. Telescopic air supply pipe; 351. Upper flange; 352. Middle pipe; 353. Lower flange; 36. Hot air coil; 4. Electric push rod; 5. Inert gas supply system; 51. Flow control valve; 6. PID temperature controller. Detailed Implementation

[0019] Example 1

[0020] like Figure 1The electric heating circulating preheater shown includes a soup dumpling body 1, which is a cavity with an open top. A cover 2 is connected to the open top of the soup dumpling body 1, and the cover 2 and the soup dumpling body 1 are sealed together. The cover 2 has an air inlet 21 and an air outlet 22. A gas heating system is connected between the air inlet 21 and the air outlet 22. The gas heating system includes an air inlet pipe 31 connected to the air inlet 21 and an air outlet pipe 32 connected to the air outlet 22. An electric heater 33 is connected between the air inlet pipe 31 and the air outlet pipe 32. A fan 34 is connected in the middle of the air outlet pipe 32. The fan 34 draws gas from the soup dumpling body 1 through the air outlet pipe 32 and sends the gas to the electric heater 33 for heating. A retractable air supply pipe 35 is provided on the side of the cover 2 away from the air inlet pipe 31, and the retractable air supply pipe 35 is connected to the air inlet pipe 31. The cover 2 is connected to an electric push rod 4, which is driven to connect to the lower opening of the retractable air supply pipe 35. The electric push rod 4 drives the lower opening of the retractable air supply pipe 35 to move up and down.

[0021] In this embodiment, the air outlet duct 32 is connected to the inert gas supply system 5 via a pipe, and the inert gas supply system 5 is connected to the air outlet duct 32 between the fan 34 and the electric heater 33 via a pipe. The inert gas supply system 5 includes an inert gas storage tank, a solenoid valve, and an inlet pipe.

[0022] In this embodiment, a flow control valve 51 is installed at the pipe connecting the inert gas supply system 5 and the air outlet pipe 32. A pressure sensor is installed between the flow control valve 51 and the air outlet pipe 32. The flow control valve 51 and the pressure sensor are electrically connected. The flow control valve 51 controls the gas flow rate based on the data detected by the pressure sensor. The flow control valve 51, in conjunction with the pressure sensor, automatically adjusts the system pressure, maintains a micro-pressure environment, prevents external air from entering, and prevents the aluminum liquid from oxidizing.

[0023] In this embodiment, the lid 2 has a sealing groove on the side near the soup packet body 1, and a sealing strip 26 is provided in the sealing groove. The soup packet body 1 and the lid 2 are sealed together by the sealing strip 26. The sealing strip 26 is designed to ensure the seal between the lid 2 and the soup packet body 1, and to ensure the airtightness of the inert gas circulation.

[0024] like Figure 2The electrically heated circulating preheater shown includes a retractable air supply pipe 35 comprising an upper flange 351, a middle pipe 352, and a lower flange 353. The upper flange 351 and the middle pipe 352 slide coaxially, and the middle pipe 352 and the lower flange 353 are coaxially slidably connected. The upper flange 351 is flanged and connected to the cover body 2. An electric push rod 4 is driven by the lower flange 353, which moves up and down. The upper flange 351, the middle pipe 352, the lower flange 353, and the drive rod of the electric push rod 4 are made of high-temperature resistant material, preferably Al2O3 coated stainless steel. The electric push rod 4, except for the drive rod portion, is preferably made of 310S stainless steel. The electric push rod 4 drives the lower flange 353 to rise and fall, adjusting its height. It can even briefly extend below the liquid surface to blow inert gas (such as argon or nitrogen) into the molten aluminum, refining the molten aluminum with inert gas and improving its quality.

[0025] like Figure 3 The electrically heated circulating preheater shown in this embodiment has a hot air plate 36 connected to the lower flange 353 at the end furthest from the upper flange 351. The hot air plate 36 is a hollow cylinder, and through holes are provided on its sidewalls and bottom. These through holes are arranged in an array around the sidewalls and bottom of the hot air plate 36. Inert gas is blown through the array of through holes in the hot air plate 36 to optimize heat diffusion and improve refining efficiency.

[0026] In this embodiment, the cover 2 includes an upper circular cover plate 23 and a lower circular cover plate 24. The outer side of the upper circular cover plate 23 is provided with a folded edge 231, and the lower circular cover plate 24 is connected to the bottom of the folded edge 231. The upper circular cover plate 23 and the lower circular cover plate 24 are set at a distance to form a flow guide cavity. The lower circular cover plate 24 is provided with flow guide holes 241 arranged around the center. The upper circular cover plate 23 is provided with a first through hole 232 connected to the air outlet pipe 32. The upper circular cover plate 23 is provided with a second through hole 233, and the lower circular cover plate 24 is provided with a third through hole 242. The second through hole 233 and the third through hole 242 are coaxially arranged. The air inlet pipe 31 is provided through the second through hole 233 and is connected to the upper side of the third through hole 242 provided in the lower circular cover plate 24. The retractable air supply pipe 35 is connected to the lower side of the third through hole 242 provided in the lower circular cover plate 24. A sealing groove is provided on the side of the lower circular cover plate 24 away from the upper circular cover plate 23. A flow guide cavity is formed between the upper circular cover plate 23 and the lower circular cover plate 24. When the fan 34 starts, a negative pressure is formed in the flow guide cavity, and hot air enters the flow guide cavity evenly from the flow guide hole 241 and then enters the air outlet duct 32, optimizing gas distribution and reducing air pressure fluctuations. The lower circular cover plate 24 can prevent molten aluminum from entering the air outlet duct 32 and prevent damage to the air outlet duct 32.

[0027] In this embodiment, a liquid level detection device 25 is connected to the top of the upper circular cover plate 23. The detection part of the liquid level detection device 25 passes through the lower circular cover plate 24 to detect the liquid level inside the soup pot body 1. The liquid level detection device 25 is an infrared sensor. The liquid level detection device 25 detects the liquid level and transmits the detected signal to the control system. The control system controls the electric push rod 4 to move the lower flange head 353 according to the detection signal, ensuring that the hot air plate 36 is immersed in the aluminum liquid and ensuring the inert gas refining effect.

[0028] In this embodiment, thermocouples are connected to the air inlet duct 31 and the air outlet duct 32, respectively. These thermocouples are electrically connected to a PID temperature controller 6, which in turn is electrically connected to an electric heater 33. The PID temperature controller 6 controls the heating power of the electric heater 33 based on the thermocouple detection data. The thermocouple in the air inlet duct 31 detects the temperature of the gas supplied to the soup packet body 1, while the thermocouple in the air outlet duct 32 detects the temperature of the gas heated by the electric heater 33. The PID temperature controller 6 adjusts the heating power of the electric heater 33 in real time based on the temperature detected by the thermocouples, achieving precise temperature control and ensuring a stable internal temperature for the soup packet body 1.

[0029] This invention is used for preheating and heat preservation of soup dumplings. When the soup dumpling body 1 is empty, it needs to be preheated to prepare for holding and transporting molten aluminum. The electric push rod 4 drives the retractable air supply pipe 35 to move down to the bottom of the soup dumpling body 1, activating the gas heating system. The fan 34 draws gas from inside the soup dumpling body 1 through the air outlet pipe 32 and sends the gas into the electric heater 33 for heating. The heated gas is then sent into the retractable air supply pipe 35 through the air inlet pipe 31 and sprayed into the soup dumpling body 1 from the lower opening of the retractable air supply pipe 35. The hot gas rises and enters the guide cavity through the guide hole 241, and then re-enters the air outlet pipe 32, forming a circulation and preheating the soup dumpling body 1. During this process, the PID temperature controller 6 adjusts the heating power of the electric heater 33 in real time according to the temperature detected by the thermocouples set in the air inlet pipe 31 and the air outlet pipe 32 to ensure that the soup dumpling body 1 reaches the set temperature. Simultaneously, the solenoid valve is opened, and the inert gas supply system 5 supplies gas to the air outlet duct 32. After being heated by the electric heater 33, the inert gas is sent into the soup dumpling body 1, replacing the air inside the soup dumpling body 1 and the duct. Molten aluminum is poured into the soup dumpling body 1. The lid 2 and the soup dumpling body 1 are sealed together by the sealing strip 26. The liquid level detection device 25 detects the liquid level. The control system controls the electric push rod 4 to move the lower flange 353 according to the detection signal, so that the hot air plate 36 is immersed in the molten aluminum. The inert gas is used to refine the molten aluminum and maintain the temperature of the soup dumpling body 1, thus keeping the molten aluminum warm.

[0030] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An electrically heated circulating preheater, characterized in that: The container includes a soup dumpling body (1), which is a cavity with an open top. A lid (2) is connected to the open top of the soup dumpling body (1), and the lid (2) and the soup dumpling body (1) are sealed together. The lid (2) has an air inlet (21) and an air outlet (22). A gas heating system is connected between the air inlet (21) and the air outlet (22). The gas heating system includes an air inlet pipe (31) connected to the air inlet (21) and an air outlet pipe (32) connected to the air outlet (22). An electric heater is connected between the air inlet pipe (31) and the air outlet pipe (32). 33); A fan (34) is connected in the middle of the air outlet pipe (32); The fan (34) draws gas from the soup bag body (1) through the air outlet pipe (32) and sends the gas into the electric heater (33) for heating; A retractable air supply pipe (35) is provided on the side of the cover (2) away from the air inlet pipe (31), and the retractable air supply pipe (35) is connected to the air inlet pipe (31); An electric push rod (4) is connected to the cover (2), and the electric push rod (4) is driven to connect to the lower opening of the retractable air supply pipe (35), and the electric push rod (4) drives the lower opening of the retractable air supply pipe (35) to move up and down.

2. The electric heating circulating preheater according to claim 1, characterized in that: The air outlet duct (32) is connected to an inert gas supply system (5) via a pipe, and the inert gas supply system (5) is connected to the air outlet duct (32) between the fan (34) and the electric heater (33) via a pipe.

3. The electrically heated circulating preheater according to claim 2, characterized in that: A flow control valve (51) is provided at the pipe connecting the inert gas supply system (5) and the air outlet pipe (32). A pressure sensor is provided between the flow control valve (51) and the air outlet pipe (32). The flow control valve (51) is electrically connected to the pressure sensor. The flow control valve (51) controls the gas flow rate according to the data detected by the pressure sensor.

4. The electric heating circulating preheater according to claim 1, characterized in that: The lid (2) has a sealing groove on the side near the soup dumpling body (1), and a sealing strip (26) is provided in the sealing groove. The soup dumpling body (1) and the lid (2) are sealed together by the sealing strip (26).

5. The electrically heated circulating preheater according to claim 1, characterized in that: The retractable air supply duct (35) includes an upper flange (351), a middle pipe (352), and a lower flange (353). The upper flange (351) and the middle pipe (352) are coaxially slidably connected, and the middle pipe (352) and the lower flange (353) are coaxially slidably connected. The upper flange (351) is flange-connected to the cover (2). The electric push rod (4) is driven to move the lower flange (353) up and down.

6. The electrically heated circulating preheater according to claim 5, characterized in that: The lower flange (353) is connected to a hot air plate (36) at the end away from the upper flange (351). The hot air plate (36) is a hollow cylinder, and through holes are provided on the side wall and bottom of the hot air plate (36).

7. The electrically heated circulating preheater according to claim 1, characterized in that: The cover (2) includes an upper circular cover plate (23) and a lower circular cover plate (24). The upper circular cover plate (23) has a folded edge (231) on its outer side. The lower circular cover plate (24) is connected to the bottom of the folded edge (231). The upper circular cover plate (23) and the lower circular cover plate (24) are spaced apart to form a flow guide cavity. The lower circular cover plate (24) has flow guide holes (241) arranged in an array around the center. The upper circular cover plate (23) has a first through hole (232) connected to the air outlet pipe (32). The upper circular cover plate (23) is provided with a second through hole (233), and the lower circular cover plate (24) is provided with a third through hole (242). The second through hole (233) and the third through hole (242) are coaxially arranged. The air inlet pipe (31) passes through the second through hole (233) and is connected to the upper side of the third through hole (242) provided on the lower circular cover plate (24). The retractable air supply pipe (35) is connected to the lower side of the third through hole (242) provided on the lower circular cover plate (24).

8. The electrically heated circulating preheater according to claim 7, characterized in that: The top of the upper round cover plate (23) is connected to a liquid level detection device (25). The detection part of the liquid level detection device (25) passes through the upper round cover plate (23). The liquid level detection device (25) detects the internal liquid level height of the soup packet body (1) through the through hole provided in the lower round cover plate (24).

9. The electric heating circulating preheater according to claim 1, characterized in that: The air inlet pipe (31) and air outlet pipe (32) are respectively connected to thermocouples. The thermocouples are electrically connected to the PID temperature controller (6). The PID temperature controller (6) is electrically connected to the electric heater (33). The PID temperature controller (6) controls the heating power of the electric heater (33) according to the thermocouple detection data.

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