Induction heating low-carbon furnace structure

Abstract

The utility model discloses an inductive heating type low carbon stove structure, including metal muffle, front gas seal, rear gas seal, water -cooling induction coil and induction power supply, the front gas seal and rear gas seal of two ends fixed mounting of metal muffle are described, water -cooling induction coil all enclose in metal muffle outer surface, induction power supply is connected with water -cooling induction coil. The utility model discloses good solution traditional heating mode through the problem of low efficiency, big heat loss of heat loss, is a kind of energy -conserving type low carbon muffle structure, and control, feedback is more direct sensitive and high accuracy.

Description

Technical Field

[0001] This utility model relates to the technical field of core process equipment for carbon fiber production, and in particular to an induction heating low-carbon furnace structure. Background Technology

[0002] Carbon fiber, as a high-performance fiber, possesses a series of excellent properties such as high specific strength, high specific modulus, creep resistance, abrasion resistance, corrosion resistance, fatigue resistance, and good thermal stability, making it one of the most advanced reinforcing materials in recent years. The production of carbon fiber involves processes such as pre-oxidation, carbonization, surface treatment, sizing, and winding. Current technology mainly involves electric heaters arranged on the upper and lower sides of a muffle furnace. These heaters heat air, which is then transferred to the muffle furnace through irradiation and the hot air. The heated muffle furnace further transfers heat to the carbon fiber for a low-temperature carbonization process. This structure involves multiple indirect heating processes, leading to problems such as lag in temperature control, low control precision, low adjustment precision, and high equipment energy consumption. Ultimately, this results in significant product quality variations and high production costs for carbon fiber. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an induction heating low-carbon furnace structure.

[0004] This utility model is achieved through the following technical solution:

[0005] An induction heating low-carbon furnace structure includes a metal muffle, a front gas seal, a rear gas seal, a water-cooled induction coil, and an induction power supply. The front gas seal and the rear gas seal are fixedly installed at both ends of the metal muffle, respectively. The water-cooled induction coil is completely surrounded on the outer surface of the metal muffle, and the induction power supply is connected to the water-cooled induction coil.

[0006] The metal muffle is made of heat-resistant stainless steel, preferably 310S. The top surface of the metal muffle has an outwardly convex arc structure to prevent the structure from deforming and sagging due to heat. There is an exhaust port on the side of the metal muffle, and flange structures are provided at both ends of the metal muffle, which are connected to the front and rear air seals through the flange structures. The working temperature is 400-1000 degrees Celsius.

[0007] The water-cooled induction coils and induction power supplies are in seven sets, with each set connected in a one-to-one correspondence.

[0008] Both the front and rear air seals are equipped with adjustable labyrinth-shaped air duct structures.

[0009] The water-cooled induction coil has a hollow structure. Cooling water is introduced during operation. When an induction power supply is applied, the water-cooled induction coil generates eddy currents in the metal muffle, thereby heating the metal muffle.

[0010] The inductive power supply is the control power supply for the water-cooled induction coil, which internally generates a high-frequency induced current through IGBTs to power the water-cooled induction coil.

[0011] The working principle of this utility model is as follows:

[0012] 1. Induction heating

[0013] Induction power supply: The induction power supply generates a high-frequency induced current through the internal IGBT (Insulated Gate Bipolar Transistor) to supply the water-cooled induction coil.

[0014] Magnetic field generation: When the water-cooled induction coil is energized, an alternating magnetic field is generated around it.

[0015] Eddy Currents and Joule Heating: When a metal muffle (as a load for induction heating) is placed in the magnetic field of a water-cooled induction coil, eddy currents will be generated inside the metal muffle due to electromagnetic induction. As the eddy currents flow inside the metal muffle, Joule heating will be generated due to the resistance, thus heating the metal muffle.

[0016] Temperature control: By adjusting the power and frequency of the induction power supply, the heating temperature and heating rate of the metal muffle can be precisely controlled.

[0017] 2. The role of air seals and duct structures

[0018] Sealing function: The front and rear gas seals, through the labyrinthine air duct structure, can effectively prevent the exchange of gas inside the furnace with the outside gas, thus playing a sealing role and ensuring the stability of the atmosphere inside the furnace.

[0019] Adjustability: The adjustable nature of the labyrinth-shaped air duct structure can adapt to different working pressures and gas flow requirements, further optimizing the furnace atmosphere.

[0020] 3. The function of the cooling system

[0021] Water-cooled induction coil: The water-cooled induction coil adopts a hollow structure. Cooling water is introduced during operation to remove the heat generated by the induction coil during operation and prevent the induction coil from being damaged due to overheating.

[0022] Cooling water circulation: The cooling water circulation system needs to have sufficient cooling capacity to ensure that the induction coil remains stable under the action of high-frequency current and to extend the service life of the equipment.

[0023] 4. Structural design of metal mufflers

[0024] Material selection: The metal muffle is made of 310S heat-resistant stainless steel, which has good high temperature resistance and mechanical strength, and can operate stably at a working temperature of 400-1000 degrees Celsius.

[0025] Arc-shaped top surface design: The metal muffle top surface has an outward convex arc-shaped structure, which can effectively prevent the structure from deforming and sagging due to heat, and further ensure the stability of the heating process.

[0026] Exhaust gas emission: The metal muffle has exhaust ports on the side to discharge the exhaust gas generated during the heating process, ensuring a clean gas environment inside the furnace.

[0027] The advantages of this utility model are:

[0028] This invention enables rapid heating: Induction heating is a non-contact heating method where heat is generated directly inside the metal muffle, resulting in high heating efficiency and minimal heat loss. By adjusting the power and frequency of the induction power supply, rapid heating can be achieved, shortening heating time and improving production efficiency.

[0029] This invention features uniform heating: the design of seven sets of water-cooled induction coils and induction power supply ensures uniform distribution of the heating area, avoiding local overheating or underheating and improving heating quality.

[0030] This invention features high thermal efficiency: induction heating has high thermal efficiency and lower energy consumption compared to traditional heating methods (such as resistance heating or gas heating), meeting the requirements of energy conservation and emission reduction.

[0031] This invention reduces energy waste: due to its high heating efficiency and short heating time, it reduces energy waste and also lowers production costs.

[0032] This invention has excellent sealing performance:

[0033] Stable atmospheric environment: The labyrinthine air duct structure with front and rear gas seals can effectively prevent gas leakage in the furnace and maintain a stable atmosphere inside the furnace, which is very important for some processes that require heating treatment under a specific atmosphere.

[0034] Highly adjustable: The adjustable labyrinth-shaped air duct structure can be adjusted according to actual process requirements, making it highly adaptable.

[0035] This utility model has high structural stability:

[0036] High-temperature resistant material: The metal muffle is made of 310S heat-resistant stainless steel, which has good high-temperature resistance and mechanical strength, and can operate stably at a working temperature of 400-1000 degrees Celsius.

[0037] Preventing deformation: The curved top surface design of the metal muffle can prevent the structure from deforming and sagging due to heat, further ensuring the stability of the heating process.

[0038] This invention boasts high security.

[0039] No open flame: During the induction heating process, heat is generated directly inside the metal muffle, and there is no high-temperature heat source on the outside, reducing safety hazards such as fire.

[0040] Automated control: The operation and control of equipment can be automated through inductive power, reducing the risks of manual operation.

[0041] This utility model features a long equipment lifespan.

[0042] Cooling system protection: The cooling system of the water-cooled induction coil can effectively protect the induction coil and extend the service life of the equipment.

[0043] Heat-resistant material: The metal muffle is made of heat-resistant stainless steel, which further improves the overall lifespan of the equipment.

[0044] This invention effectively solves the problems of low efficiency and high heat loss in traditional heating methods that rely on indirect heating. It is an energy-saving, low-carbon muffle structure that also provides more direct, sensitive, and precise control and feedback. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of this utility model;

[0046] Figure 2 This is a schematic diagram of the metal muffle structure of this utility model;

[0047] Figure 3 This is a schematic diagram of the water-cooled induction coil and induction power supply of this utility model. Detailed Implementation

[0048] like Figure 1-3 As shown, an induction heating low-carbon furnace structure includes a metal muffle 1, a front gas seal 2, a rear gas seal 3, a water-cooled induction coil 4, and an induction power supply 5. The front gas seal 2 and the rear gas seal 3 are fixedly installed at both ends of the metal muffle 1, respectively. The water-cooled induction coil 4 completely surrounds the outer surface of the metal muffle 1, and the induction power supply 5 is connected to the water-cooled induction coil 4. The induction power supply 5 is the control power supply for the water-cooled induction coil 4, and its output is automatically adjusted in conjunction with the measurement results of an external temperature sensing element.

[0049] The metal muffle 1 is made of heat-resistant stainless steel, preferably 310S. The top surface of the metal muffle 1 has an outwardly convex arc structure to prevent the structure from deforming and sagging due to heat. An exhaust port 7 is provided on the side of the metal muffle 1, and flange structures 6 are provided at both ends of the metal muffle 1. The flange structures 6 are connected to the front and rear air seals 3. The working temperature is 400-800 degrees Celsius.

[0050] The water-cooled induction coil 4 and the induction power supply 5 are each in seven groups, and the seven groups of water-cooled induction coil 4 and the seven groups of induction power supply 5 are connected in a one-to-one correspondence.

[0051] Both the front and rear air seals 3 are equipped with adjustable labyrinth-shaped air duct structures.

[0052] The water-cooled induction coil 4 has a hollow structure. Cooling water is introduced during operation. When the induction power supply 5 is applied, the water-cooled induction coil 4 generates eddy currents in the metal muffle 1, thereby causing the metal muffle 1 to heat up.

[0053] The inductive power supply 5 is the control power supply for the water-cooled induction coil 4. It generates a high-frequency induced current through IGBT to power the water-cooled induction coil 4.

[0054] This utility model includes a metal muffle 1, a front air seal 2, a rear air seal 3, seven sets of water-cooled induction coils 4, and seven sets of induction power supplies 5.

[0055] The metal muffle 1 is made of heat-resistant stainless steel, preferably 310S. It has an arc-shaped structure on the top to prevent the structure from deforming and sagging due to heat. It has an exhaust port 7 on the side and flange structures 6 at the front and rear. The flanges are connected to the gas seal. The working temperature is 400-1000 degrees Celsius.

[0056] The front gas seal 2 is a metal muffle 1 inlet structure used to introduce heated nitrogen gas, prevent oxygen from entering the metal muffle 1, and prevent oxidation of the metal muffle 1 and carbon fiber products. The gas seal has an adjustable labyrinth-shaped air duct structure, which reduces gas leakage. When the furnace width is 1500mm, the nitrogen input is 400-1000NM3 / h.

[0057] The rear gas seal 3 is the outlet structure of the metal muffle 1, used to introduce nitrogen gas to prevent oxygen from entering the metal muffle 1 and to prevent oxidation of the metal muffle 1 and carbon fiber products. The gas seal has an adjustable labyrinth-shaped air duct structure, which reduces the amount of gas leakage. When the furnace width is 1500mm, the nitrogen input is 400-1000NM3 / h.

[0058] The water-cooled induction coil 4 is completely surrounded by the metal muffle 1. When the induction power supply 5 is applied, eddy currents are generated in the metal muffle 1, causing the metal muffle 1 to heat up. To prevent the coil from overheating, the coil has a hollow structure and is circulated with cooling water during operation. The whole system is equipped with seven sets of water-cooled induction coils 4, which can be independently heated in seven zones to form a temperature gradient and meet the process adjustment requirements. When the furnace width is 1500mm, the current in each zone is 400-3500A; the cooling water pressure is 0.1-0.4MPa; and the coil spacing is 50mm.

[0059] The inductive power supply 5 is the control power supply for the water-cooled induction coil 4. It generates a high-frequency induced current through IGBT to power the water-cooled induction coil 4, with an oscillation frequency of 30-100KHZ.

[0060] This invention effectively solves the problems of low efficiency and high heat loss caused by indirect heating in traditional heating methods. It is an energy-saving, low-carbon furnace structure, and at the same time, the control and feedback are more direct and sensitive.

[0061] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A structure for an induction heating low-carbon furnace, characterized in that: It includes a metal muffle, a front air seal, a rear air seal, a water-cooled induction coil, and an induction power supply. The front air seal and the rear air seal are fixedly installed at both ends of the metal muffle, respectively. The water-cooled induction coil is completely surrounded on the outer surface of the metal muffle, and the induction power supply is connected to the water-cooled induction coil.

2. The structure of an induction heating low-carbon furnace according to claim 1, characterized in that: The metal muffle is made of heat-resistant stainless steel. The top surface of the metal muffle has an outwardly convex arc-shaped structure, and an exhaust port is provided on the side of the metal muffle.

3. The structure of an induction heating low-carbon furnace according to claim 2, characterized in that: The metal muffle mentioned is made of 310S material.

4. The structure of an induction heating low-carbon furnace according to claim 2, characterized in that: The metal muffle is provided with flange structures at both ends, which are connected to the front and rear air seals through the flange structures.

5. The structure of an induction heating low-carbon furnace according to claim 1, characterized in that: The water-cooled induction coils and induction power supplies are in seven sets, with each set connected in a one-to-one correspondence.

6. The structure of an induction heating low-carbon furnace according to claim 1, characterized in that: Both the front and rear air seals are equipped with adjustable labyrinth-shaped air duct structures.

7. The structure of an induction heating low-carbon furnace according to claim 1, characterized in that: The water-cooled induction coil has a hollow structure. Cooling water is introduced during operation. When an induction power supply is applied, the water-cooled induction coil generates eddy currents in the metal muffle, thereby heating the metal muffle.

8. The structure of an induction heating low-carbon furnace according to claim 1, characterized in that: The inductive power supply is the control power supply for the water-cooled induction coil, which internally generates a high-frequency induced current through IGBTs to power the water-cooled induction coil.

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