Furnace tube for induction heating furnace

Abstract

The utility model discloses a furnace tube for an induction heating furnace, which relates to the technical field of furnace tubes, and comprises a ceramic inner tube, a ceramic outer tube, a graphite tube and an induction coil, the ceramic inner tube can be coaxially nested in the ceramic outer tube, and an annular gap is formed between the ceramic inner tube and the ceramic outer tube; the graphite pipe can be coaxially nested between the ceramic inner pipe and the ceramic outer pipe and is located in the annular gap, a first sealing part can be filled between the first end of the annular gap and the first end of the graphite pipe, and a second sealing part can be filled between the second end of the annular gap and the second end of the graphite pipe; and the induction coil can be wound on the ceramic outer tube so as to heat the graphite tube. When the bar heating device is used for heating bars, the temperature of the bars can be ensured to be consistent, meanwhile, the diameter difference of the bars does not influence heating, and materials such as non-magnetic materials, non-conductive materials and non-metal materials can be heated.

Description

A furnace tube for an induction heating furnace Technical Field

[0001] This utility model relates to the field of furnace tube technology, and in particular to a furnace tube for an induction heating furnace. Background Technology

[0002] The furnace tubes of ordinary induction heating furnaces are usually made of high-temperature and corrosion-resistant alloy materials. When heating, the induction coil generates an alternating magnetic field through high-frequency current, which causes eddy currents to be generated inside the metal workpiece and thus generates heat.

[0003] However, since there is no induction at the joint of the induction coil, the temperature here is lower than other parts, thus causing a temperature difference phenomenon (a dark area consistent with the induction coil).

[0004] When using the furnace tubes of a conventional induction heating furnace to heat cobalt-based alloy bars, there are several problems: the temperature at both ends of the heated bars is low; the temperature of the heated bars is uneven; the heating efficiency decreases significantly when the heated bars are too thin; and the system is only suitable for heating conductive materials such as metals, and is ineffective for non-magnetic, non-conductive, and non-metallic materials. Summary of the Invention

[0005] The purpose of this invention is to provide a furnace tube for an induction heating furnace to solve the problems existing in the above-mentioned related technologies. When heating bar stock, it can ensure that the temperature of the bar stock is uniform throughout. At the same time, the difference in the diameter of the bar stock does not affect the heating. Furthermore, it can heat non-magnetic, non-conductive, and non-metallic materials.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a furnace tube for an induction heating furnace, including a ceramic inner tube, a ceramic outer tube, a graphite tube, and an induction coil. The ceramic inner tube can be coaxially nested inside the ceramic outer tube, and an annular gap is formed between the ceramic inner tube and the ceramic outer tube.

[0008] The graphite tube can be coaxially nested between the inner ceramic tube and the outer ceramic tube, and located within the annular gap. A first sealing portion can be filled between the first end of the annular gap and the first end of the graphite tube, and a second sealing portion can be filled between the second end of the annular gap and the second end of the graphite tube.

[0009] The induction coil can be wound around the ceramic outer tube to heat the graphite tube.

[0010] Preferably, the annular gap is filled with inert gas to form an inert gas protective space.

[0011] Preferably, the furnace tube for the induction heating furnace further includes an inlet pipe and an outlet pipe. The inlet pipe can be disposed within the first sealing part or the second sealing part and communicate with the annular gap, and the inlet pipe can introduce the inert gas. The outlet pipe can be disposed within the first sealing part or the second sealing part and communicate with the annular gap, and the outlet pipe can discharge the inert gas. When the inert gas protective space is formed within the annular gap, the inlet pipe is filled with a third sealing part, and the outlet pipe is filled with a fourth sealing part.

[0012] Preferably, the air inlet pipe and the air outlet pipe are located at the same end of the annular gap, and both the air inlet pipe and the air outlet pipe are arranged along the inner wall of the ceramic outer tube.

[0013] Preferably, the first sealing part, the second sealing part, the third sealing part, and the fourth sealing part are all made of high-temperature resistant cement.

[0014] Preferably, the inert gas is nitrogen.

[0015] This utility model achieves the following technical advantages compared to related technologies:

[0016] The furnace tube for the induction heating furnace provided by this utility model includes a ceramic inner tube, a ceramic outer tube, a graphite tube, and an induction coil. During assembly, the ceramic inner tube is first coaxially nested inside the ceramic outer tube, forming an annular gap between the ceramic inner tube and the ceramic outer tube. Then, the graphite tube is coaxially nested between the ceramic inner tube and the ceramic outer tube, with the graphite tube located within the annular gap. Then, the two ends of the annular gap are sealed by the first sealing part and the second sealing part, respectively. The induction coil is wound around the ceramic outer tube. In use, the magnetic field generated by energizing the induction coil induces the graphite tube, causing the graphite tube to heat up, which in turn radiates heat to heat the bar stock, ensuring that the temperature of the bar stock is uniform throughout. At the same time, the difference in the diameter of the bar stock does not affect the heating. Furthermore, it can heat non-magnetic, non-conductive, and non-metallic materials. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the furnace tube for the induction heating furnace provided in an embodiment of this utility model.

[0019] In the diagram: 1-Ceramic inner tube, 2-Ceramic outer tube, 3-Graphite tube, 4-Induction coil, 5-First sealing part, 6-Second sealing part. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The purpose of this invention is to provide a furnace tube for an induction heating furnace to solve the problems existing in related technologies. When heating bar stock, it can ensure that the temperature of the bar stock is uniform throughout. At the same time, the difference in the diameter of the bar stock does not affect the heating. Furthermore, it can heat non-magnetic, non-conductive, and non-metallic materials.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] As shown in Figure 1, this embodiment provides a furnace tube for an induction heating furnace, including a ceramic inner tube 1, a ceramic outer tube 2, a graphite tube 3, and an induction coil 4. The ceramic inner tube 1 can be coaxially nested inside the ceramic outer tube 2, and an annular gap is formed between the ceramic inner tube 1 and the ceramic outer tube 2. The graphite tube 3 can be coaxially nested between the ceramic inner tube 1 and the ceramic outer tube 2, and is located within the annular gap. A first sealing part 5 can be filled between the first end of the annular gap and the first end of the graphite tube 3 (the left end of the graphite tube 3 in Figure 1), and a second sealing part 6 can be filled between the second end of the annular gap and the second end of the graphite tube 3 (the right end of the graphite tube 3 in Figure 1). The induction coil 4 can be wound around the ceramic outer tube 2 to heat the graphite tube 3.

[0024] In this embodiment, an inert gas protective space is formed within the annular gap by inert gas replacement, and the inert gas is preferably nitrogen.

[0025] In this embodiment, the furnace tube for the induction heating furnace further includes an inlet pipe and an outlet pipe. The inlet pipe can be disposed within the first sealing part 5 or the second sealing part 6 and communicate with the annular gap, and nitrogen gas can be introduced into the inlet pipe. The outlet pipe can be disposed within the first sealing part 5 or the second sealing part 6 and communicate with the annular gap, and nitrogen gas can be discharged from the outlet pipe. When an inert gas protective space is formed in the annular gap, the inlet pipe is filled with a third sealing part, and the outlet pipe is filled with a fourth sealing part.

[0026] Furthermore, in this embodiment, the air inlet pipe and the air outlet pipe are located at the same end of the annular gap, and both the air inlet pipe and the air outlet pipe are arranged along the inner wall of the ceramic outer tube 2.

[0027] In this embodiment, the first sealing part 5, the second sealing part 6, the third sealing part, and the fourth sealing part are all high-temperature resistant cement, such as aluminate cement.

[0028] The assembly and use process of the furnace tube for the induction heating furnace provided in this embodiment is as follows:

[0029] In this embodiment, the inner diameter of the ceramic outer tube 2 is larger than the outer diameter of the graphite tube 3, and the inner diameter of the graphite tube 3 is larger than the outer diameter of the ceramic inner tube 1. The specific dimensions are calculated based on the expansion coefficient of various materials. Then, as shown in Figure 1, the ceramic inner tube 1, the ceramic outer tube 2, and the graphite tube 3 are combined. One end is sealed with high-temperature resistant cement. After the high-temperature resistant cement solidifies, the other end is first laid with an air inlet pipe and an air outlet pipe along the inner wall of the ceramic outer tube 2, and then sealed with high-temperature resistant cement. After the high-temperature resistant cement solidifies, nitrogen gas is introduced into the air inlet pipe. After the nitrogen gas fills the gap between the graphite tube 3 and the ceramic inner tube 1 and the ceramic outer tube 2, the air inlet pipe and the air outlet pipe are quickly sealed with high-temperature resistant cement. It can be used after the high-temperature resistant cement has completely solidified. In use, the induction coil 4 is energized to generate a magnetic field that induces the graphite tube 3, causing the graphite tube 3 to heat up, and then radiates heat to the workpiece.

[0030] The furnace tube for the induction heating furnace provided in this embodiment has the following advantages:

[0031] First, it is easy to disassemble and assemble: Since the graphite tube 3 is a vulnerable part, this method of assembly makes it easy to replace.

[0032] Second, the heating process for products with small rolling temperature difference ranges and those that are greatly affected by temperature differences has been significantly improved.

[0033] Third, materials that are not suitable for induction heating (non-magnetic, non-conductive, and non-metallic) can be made usable.

[0034] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A furnace tube for an induction heating furnace, characterized in that: The device includes an inner ceramic tube, an outer ceramic tube, a graphite tube, and an induction coil. The inner ceramic tube is coaxially nested within the outer ceramic tube, forming an annular gap between them. The graphite tube is coaxially nested between the inner and outer ceramic tubes and located within the annular gap. A first sealing portion is filled between the first end of the annular gap and the first end of the graphite tube, and a second sealing portion is filled between the second end of the annular gap and the second end of the graphite tube. The induction coil is wound around the outer ceramic tube to heat the graphite tube.

2. The furnace tube for an induction heating furnace according to claim 1, characterized in that: The annular gap is filled with inert gas to form an inert gas protective space.

3. The furnace tube for an induction heating furnace according to claim 2, characterized in that: The furnace tube for the induction heating furnace further includes an inlet pipe and an outlet pipe. The inlet pipe can be disposed within the first sealing part or the second sealing part and communicate with the annular gap, and the inlet pipe can introduce the inert gas. The outlet pipe can be disposed within the first sealing part or the second sealing part and communicate with the annular gap, and the outlet pipe can discharge the inert gas. When the inert gas protection space is formed within the annular gap, the inlet pipe is filled with a third sealing part, and the outlet pipe is filled with a fourth sealing part.

4. The furnace tube for an induction heating furnace according to claim 3, characterized in that: The air inlet pipe and the air outlet pipe are located at the same end of the annular gap, and both the air inlet pipe and the air outlet pipe are arranged along the inner wall of the ceramic outer tube.

5. The furnace tube for an induction heating furnace according to claim 3, characterized in that: The first sealing part, the second sealing part, the third sealing part, and the fourth sealing part are all made of high-temperature resistant cement.

6. The furnace tube for an induction heating furnace according to claim 2, characterized in that: The inert gas is nitrogen.

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