Protective gas inlet system of annealing furnace

Abstract

The utility model belongs to the technical field of annealing furnaces, and particularly relates to a shielding gas inlet system of an annealing furnace. The defects of unreasonable design and the like in the prior art are overcome. The shielding gas inlet system of the annealing furnace comprises a shell and further comprises a heat insulation layer, the heat insulation layer is arranged in the shell, and a heat insulation cavity is formed in the center of the heat insulation layer; the upper end and the lower end of the shielding gas cracking pipe are closed, and at least part of the shielding gas cracking pipe is inserted into the heat insulation cavity; the upper end of the shielding gas inlet pipe is fixed to the upper end of the shielding gas cracking pipe, the shielding gas inlet pipe is inserted into the shielding gas cracking pipe, and a gap is reserved between the lower end of the shielding gas inlet pipe and the lower end of the shielding gas cracking pipe; and the heating element is arranged in the heat insulation cavity. The method has the advantages that heat preservation of the shielding gas can be formed, so that the shielding gas is fully cracked, and the utilization rate of the shielding gas is increased.

Description

Technical Field

[0001] This utility model belongs to the field of annealing furnace technology, and in particular relates to an annealing furnace protective gas intake system. Background Technology

[0002] Annealing furnaces are widely used in industry.

[0003] For example, Chinese patent CN220597696U discloses an annealing furnace air inlet device, including a housing. A swing mechanism is provided on the right side of the housing. The swing mechanism includes a straight pipe, a flexible hose, an air outlet, a fixing clamp, a vertical slide groove, a horizontal column, a first motor, a first shaft, and a slider. The left side of the straight pipe passes through both ends of the right inner wall of the housing. The right end of the flexible hose is inserted into the left end of the straight pipe. The air outlet is fixedly connected to the left end of the flexible hose. The top of the flexible hose is movably connected to the fixing clamp. The bottom of the vertical slide groove is fixedly connected to the top of the fixing clamp. The top right side of the vertical slide groove is hinged to the horizontal column. The right end of the horizontal column is fixedly connected to the right inner wall of the housing. The right side of the first motor is fixedly connected to the right inner wall of the housing. The left output end of the first motor is fixedly connected to the first shaft. The left side of the first shaft is hinged to a slider, which is slidably connected inside the vertical slide groove. The advantages of this scheme are: the first motor drives the vertical slide groove to swing left and right, thereby moving the hose left and right, preventing the protective gas blown into the hose from blowing out in the same direction all the time, which would cause the local temperature inside the furnace to be too low, thus affecting the normal operation of the annealing furnace.

[0004] While the above solutions have the aforementioned technical advantages, they lack temperature protection for the protective gas, leading to incomplete decomposition of the protective gas and other issues. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems by providing an annealing furnace protective gas intake system that can solve the above-mentioned technical issues.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The protective gas intake system for this annealing furnace includes a housing, and also includes:

[0008] A heat insulation layer is disposed inside the outer shell and has a heat insulation cavity in the center;

[0009] A protective gas pyrolysis tube, wherein the upper and lower ends of the protective gas pyrolysis tube are closed and at least a portion of the protective gas pyrolysis tube is inserted into the heat insulation cavity;

[0010] A protective gas inlet pipe is provided, the upper end of which is fixed to the upper end of the protective gas pyrolysis pipe and inserted into the protective gas pyrolysis pipe. A gap is left between the lower end of the protective gas inlet pipe and the lower end of the protective gas pyrolysis pipe.

[0011] A heating element is disposed within the heat-insulating cavity;

[0012] The upper end of the protective gas pyrolysis tube is provided with a protective gas inlet that communicates with the protective gas inlet pipe, and the upper end of the protective gas pyrolysis tube is provided with a protective gas outlet that communicates with the protective gas pyrolysis tube.

[0013] In the above-mentioned annealing furnace protective gas inlet system, the protective gas pyrolysis pipe is inserted into the center of the heat insulation cavity; the protective gas inlet pipe is inserted into the center of the protective gas pyrolysis pipe.

[0014] In the above-mentioned protective gas inlet system for the annealing furnace, a flange is sealed and connected to the top of the protective gas pyrolysis pipe, and the protective gas inlet and the protective gas outlet are respectively located on the flange.

[0015] In the above-mentioned annealing furnace protective gas inlet system, the flange is fixed to the top of the outer shell by a sealing cylinder, and a sealing material layer is provided between the inner wall of the sealing cylinder and the outer wall of the protective gas pyrolysis pipe.

[0016] In the above-mentioned annealing furnace protective gas inlet system, the heating element includes several electric heating groups that are respectively in contact with the outer wall of the protective gas pyrolysis tube. The electric heating groups are evenly distributed in the circumferential direction of the protective gas pyrolysis tube and evenly distributed at intervals in the axial direction of the protective gas pyrolysis tube.

[0017] In the above-mentioned annealing furnace protective gas inlet system, the heat insulation layer includes a bottom heat insulation sublayer disposed at the bottom of the outer shell, a lateral annular heat insulation sublayer disposed on the inner wall of the outer shell and with its lower end abutting against the bottom heat insulation sublayer, and a top annular heat insulation sublayer placed on top of the lateral annular heat insulation sublayer. The top surface of the top annular heat insulation sublayer contacts the inner top surface of the outer shell, and the heat insulation cavity is formed inside the bottom heat insulation sublayer, the lateral annular heat insulation sublayer, and the top annular heat insulation sublayer.

[0018] In the above-mentioned annealing furnace protective gas inlet system, the inner diameter of the top annular heat insulation sublayer is smaller than the inner diameter of the lateral annular heat insulation sublayer.

[0019] In the above-mentioned annealing furnace protective gas inlet system, the heating element is located in the annular chamber formed between the lateral annular insulation sublayer and the protective gas pyrolysis tube.

[0020] In the above-mentioned annealing furnace protective gas inlet system, the thickness of the bottom insulation sublayer is less than the wall thickness of the lateral annular insulation sublayer, and the wall thickness of the lateral annular insulation sublayer is greater than the thickness of the top annular insulation sublayer.

[0021] In the above-mentioned protective gas inlet system for the annealing furnace, the lower end of the protective gas inlet pipe is provided with an inclined surface.

[0022] Compared with existing technologies, the advantages of this application are:

[0023] By combining a heat insulation layer, a protective gas pyrolysis tube, and a heating element, the protective gas can be kept warm to ensure sufficient pyrolysis and improve its utilization rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the protective gas intake system for the annealing furnace provided by this utility model.

[0025] In the figure, the outer shell is 1, the insulation layer is 2, the bottom insulation sub-layer is 20, the lateral annular insulation sub-layer is 21, the top annular insulation sub-layer is 22, the protective gas pyrolysis pipe is 3, the protective gas inlet is 30, the protective gas outlet is 31, the protective gas inlet pipe is 4, the inclined surface is 40, the heating element is 5, the electric heating group is 50, the flange is 6, the sealing cylinder is 60, the sealing material layer is 61, and the insulation cavity is G. Detailed Implementation

[0026] The following are specific embodiments of the utility model, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the utility model. However, the utility model is not limited to these embodiments.

[0027] Example 1

[0028] like Figure 1 As shown, the protective gas inlet system of this annealing furnace includes an outer shell 1, a heat insulation layer 2, a protective gas pyrolysis pipe 3, a protective gas inlet pipe 4, and a heating element 5.

[0029] Insulation layer 2 serves to provide thermal insulation.

[0030] The protective gas pyrolysis tube 3 is used for the pyrolysis reaction of the protective gas, and at the same time, it provides protection for the protective gas inlet tube 4.

[0031] Specifically, the heat insulation layer 2 is disposed inside the outer shell 1 and has a heat insulation cavity G in the center; the heat insulation cavity G is convex in shape. For example, in this embodiment, the heat insulation layer 2 is made of any one or a combination of asbestos and stone bricks.

[0032] Secondly, the upper and lower ends of the protective gas pyrolysis pipe 3 are closed, and at least a portion of the protective gas pyrolysis pipe 3 is inserted into the heat insulation cavity G. Preferably, the protective gas pyrolysis pipe 3 is inserted into the center of the heat insulation cavity G. The protective gas pyrolysis pipe 3 is a circular pipe, with a flange 6 at the upper end and a lower closed portion at the lower end. The upper end of the protective gas inlet pipe 4 is fixed to the upper end of the protective gas pyrolysis pipe 3, and the protective gas inlet pipe 4 is inserted into the protective gas pyrolysis pipe 3. Preferably, the protective gas inlet pipe 4 is inserted into the center of the protective gas pyrolysis pipe 3, and a gap is left between the lower end of the protective gas inlet pipe 4 and the lower end of the protective gas pyrolysis pipe 3. The lower end of the protective gas inlet pipe 4 has a bevel 40 so that the protective gas delivered by the protective gas inlet pipe 4 enters the protective gas pyrolysis pipe 3. A protective gas inlet 30 connected to a protective gas inlet pipe 4 is provided at the upper end of the protective gas pyrolysis pipe 3, and a protective gas outlet 31 connected to the protective gas pyrolysis pipe 3 is provided at the upper end of the protective gas pyrolysis pipe 3.

[0033] In addition, the heating element 5 is located inside the heat-insulating cavity G. The heating element 5 is an electric heating element.

[0034] In a preferred embodiment, a flange 6 is sealed to the top of the protective gas pyrolysis pipe 3, for example, by welding. A protective gas inlet 30 and a protective gas outlet 31 are respectively located on the flange 6. Specifically, an inlet pipe with a protective gas inlet 30 is connected to the flange 6, communicating with the protective gas inlet pipe 4. An outlet pipe with a protective gas outlet 31 is also connected to the flange 6, communicating with the protective gas pyrolysis pipe 3. Further, the flange 6 is fixed to the top of the outer casing 1 by a sealing cylinder 60. A sealing material layer 61 is provided between the inner wall of the sealing cylinder 60 and the outer wall of the protective gas pyrolysis pipe 3. The sealing material layer 61 is, for example, asbestos or similar materials.

[0035] In this embodiment, the heat insulation layer 2 and the protective gas pyrolysis tube 3 are combined with the heating element 5 to form a heat preservation for the protective gas, thereby ensuring the full pyrolysis of the protective gas and improving the utilization rate of the protective gas.

[0036] Furthermore, flange 6 includes a lower flange 6a and an upper flange 6b. The lower flange is fitted and fixed to the top of the protective gas pyrolysis pipe 3, and the lower flange and the upper flange are sealed and fixedly connected by several bolts. The gas outlet pipe body and the gas outlet pipe body are respectively fixed to the upper flange.

[0037] Example 2

[0038] Based on Example 1, such as Figure 1As shown, this embodiment further provides the following technical solution: The heating element 5 includes several electric heating groups 50 that are respectively in contact with the outer wall of the protective gas pyrolysis tube 3. The electric heating groups 50 are uniformly distributed in the circumferential direction of the protective gas pyrolysis tube 3, and the electric heating groups 50 are uniformly distributed at intervals in the axial direction of the protective gas pyrolysis tube 3. The electric heating group 50 is any one or a combination of two of the heating wire and the heating rod. One end of the electric heating group 50 abuts against the outer wall of the protective gas pyrolysis tube 3, and the other end of the electric heating group 50 is fixed to the heat insulation layer 2 and powered by an external power supply.

[0039] Example 3

[0040] Based on Embodiment 1 or Embodiment 2, such as Figure 1 As shown, this embodiment further provides the following technical solution: the heat insulation layer 2 includes a bottom heat insulation sub-layer 20 disposed at the bottom of the outer shell 1, a lateral annular heat insulation sub-layer 21 disposed on the inner wall of the outer shell 1 and with its lower end abutting against the bottom heat insulation sub-layer 20, and a top annular heat insulation sub-layer 22 placed on top of the lateral annular heat insulation sub-layer 21. The top surface of the top annular heat insulation sub-layer 22 contacts the inner top surface of the outer shell 1, and a heat insulation cavity G is formed inside the bottom heat insulation sub-layer 20, the lateral annular heat insulation sub-layer 21 and the top annular heat insulation sub-layer 22.

[0041] The bottom insulation sublayer 20 consists of several layers of insulation bricks stacked from bottom to top.

[0042] The lateral annular insulation sublayer 21 is any one or a combination of two of several insulation brick layers and insulation asbestos layers that are sequentially attached from the outside to the inside.

[0043] The top annular insulating sublayer 22 consists of several layers of insulating asbestos stacked from bottom to top.

[0044] The inner diameter of the top annular insulating sublayer 22 is smaller than the inner diameter of the lateral annular insulating sublayer 21. This difference in inner diameter creates a certain corner barrier against the rising temperature flow.

[0045] The heating element 5 is located in the annular chamber formed between the lateral annular insulation sublayer 21 and the protective gas pyrolysis tube 3. The thickness of the bottom insulation sublayer 20 is less than the wall thickness of the lateral annular insulation sublayer 21, and the wall thickness of the lateral annular insulation sublayer 21 is greater than the thickness of the top annular insulation sublayer 22. This different thickness design is mainly for better thermal insulation.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An annealing furnace protective gas inlet system, comprising an outer shell (1), characterized in that, The annealing furnace protective gas intake system also includes: A heat insulation layer (2) is disposed inside the outer shell (1) and has a heat insulation cavity (G) in the center; A protective gas pyrolysis tube (3) is provided, with its upper and lower ends closed and at least a portion of the protective gas pyrolysis tube (3) inserted into the heat insulation cavity (G). A protective gas inlet pipe (4) is provided, the upper end of which is fixed to the upper end of the protective gas pyrolysis pipe (3) and the protective gas inlet pipe (4) is inserted into the protective gas pyrolysis pipe (3). A gap is left between the lower end of the protective gas inlet pipe (4) and the lower end of the protective gas pyrolysis pipe (3). Heating element (5), the heating element (5) is disposed in the heat insulation cavity (G); The upper end of the protective gas pyrolysis pipe (3) is provided with a protective gas inlet (30) that communicates with the protective gas inlet pipe (4), and the upper end of the protective gas pyrolysis pipe (3) is provided with a protective gas outlet (31) that communicates with the protective gas pyrolysis pipe (3).

2. The annealing furnace protective gas inlet system according to claim 1, characterized in that, The protective gas pyrolysis tube (3) is inserted into the center of the heat insulation cavity (G); the protective gas inlet tube (4) is inserted into the center of the protective gas pyrolysis tube (3).

3. The annealing furnace protective gas inlet system according to claim 1, characterized in that, A flange (6) is sealed to the top of the protective gas pyrolysis pipe (3), and the protective gas inlet (30) and the protective gas outlet (31) are respectively located on the flange (6).

4. The annealing furnace protective gas inlet system according to claim 3, characterized in that, The flange (6) is fixed to the top of the outer shell (1) by a sealing cylinder (60), and a sealing material layer (61) is provided between the inner wall of the sealing cylinder (60) and the outer wall of the protective gas pyrolysis pipe (3).

5. The annealing furnace protective gas inlet system according to claim 1, characterized in that, The heating element (5) includes several electric heating groups (50) that are in contact with the outer wall of the protective gas pyrolysis tube (3). The electric heating groups (50) are evenly distributed in the circumferential direction of the protective gas pyrolysis tube (3) and evenly distributed at intervals in the axial direction of the protective gas pyrolysis tube (3).

6. The annealing furnace protective gas inlet system according to claim 5, characterized in that, The heat insulation layer (2) includes a bottom heat insulation sublayer (20) disposed at the bottom of the inner shell (1), a lateral annular heat insulation sublayer (21) disposed on the inner wall of the outer shell (1) and with its lower end abutting against the bottom heat insulation sublayer (20), and a top annular heat insulation sublayer (22) placed on top of the lateral annular heat insulation sublayer (21). The top surface of the top annular heat insulation sublayer (22) contacts the inner top surface of the outer shell (1). The heat insulation cavity (G) is formed inside the bottom heat insulation sublayer (20), the lateral annular heat insulation sublayer (21) and the top annular heat insulation sublayer (22).

7. The annealing furnace protective gas inlet system according to claim 6, characterized in that, The inner diameter of the top annular insulation sublayer (22) is smaller than the inner diameter of the lateral annular insulation sublayer (21).

8. The annealing furnace protective gas inlet system according to claim 6, characterized in that, The heating element (5) is located in the annular chamber formed between the lateral annular heat insulation sublayer (21) and the protective gas pyrolysis tube (3).

9. The annealing furnace protective gas inlet system according to claim 6, characterized in that, The thickness of the bottom insulation sublayer (20) is less than the wall thickness of the lateral annular insulation sublayer (21), and the wall thickness of the lateral annular insulation sublayer (21) is greater than the thickness of the top annular insulation sublayer (22).

10. The annealing furnace protective gas inlet system according to claim 1, characterized in that, The lower end of the protective gas inlet pipe (4) is provided with a slope (40).

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