Multi-layer electrode sealing mounting structure for vacuum heat treatment furnace

Abstract

The utility model provides a multilayer electrode sealing mounting structure for vacuum heat treatment furnace belongs to vacuum heat treatment equipment technical field. Including multilayer heat shield, be equipped with electrode hole on each layer heat shield, and the corresponding setting of each layer electrode hole inside and outside, still include the sealing pipe of being worn in each layer electrode hole, sealing pipe both ends are equipped with the outer flanging respectively, wherein sealing pipe outer end is outer end outer flanging, and inner end is inner end outer flanging, and outer end outer flanging is closely contacted with the outer surface of the outermost heat shield, and inner end outer flanging is closely contacted with the inner surface of the innermost heat shield, and the inside insertion of sealing pipe has insulating tube, and insulating tube is with sealing pipe transition fit, and electrode passes from insulating tube. The utility model effectively solved the problem of the influence vacuum degree, temperature and product quality caused by the sealing not strict when electrode installation, simple structure, good sealing, applicable to vacuum heat treatment furnace.

Description

Technical Field

[0001] This utility model belongs to the technical field of vacuum heat treatment equipment, specifically relating to a multi-layer electrode sealing installation structure for a vacuum heat treatment furnace. Background Technology

[0002] Vacuum heat treatment furnaces are widely used in the heat treatment of metallic materials, and their thermal field is typically composed of multiple layers of heat shields. Electrodes must pass through electrode holes in each layer of heat shields from the outside to provide heating power. Due to unavoidable errors in the processing and assembly of the multi-layer heat shields, misalignment often exists between the electrode holes of each layer, resulting in gaps of varying sizes between the electrodes and the hole walls.

[0003] These gaps can lead to gas leakage inside the furnace, which not only reduces the vacuum level and affects the heat treatment effect, but may also cause oxidation of the workpiece surface due to air ingress, reducing product purity and quality. While some sealing measures exist in existing technologies, they are mostly focused on single-layer sealing or local compensation, making it difficult to achieve effective overall sealing of multi-layer structures. Furthermore, their insulation performance is insufficient, easily leading to sparking. Therefore, improvements are necessary. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a multi-layer electrode sealing installation structure for a vacuum heat treatment furnace. This utility model solves the problems caused by poor sealing during electrode installation in the prior art, which affects the vacuum level, temperature and product quality.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-layer electrode sealing installation structure for a vacuum heat treatment furnace includes multiple layers of heat insulation screens, each layer of the heat insulation screen is provided with electrode holes, and the electrode holes of each layer are arranged correspondingly inside and outside. It also includes a sealing tube that passes through the electrode holes of each layer. The sealing tube has an outward flange at both ends, wherein the outer end of the sealing tube is an outer outward flange and the inner end is an inner outward flange. The outer outward flange is in close contact with the outer surface of the outermost heat insulation screen, and the inner outward flange is in close contact with the inner surface of the innermost heat insulation screen. An insulating tube is inserted inside the sealing tube, and the insulating tube is fitted with the sealing tube; the electrode passes through the insulating tube.

[0006] As a further specification of the above scheme, the sealing tube is made of molybdenum or a molybdenum alloy.

[0007] As a further limitation of the above scheme, both the outer end flange and the inner end flange adopt a rounded corner bend transition.

[0008] As a further limitation of the above scheme, the insulating tube is a 99% ceramic insulating tube.

[0009] Further defining the above scheme, the sealing tube is fitted with the electrode holes of each layer of heat insulation screen with a clearance, and axial compression sealing is achieved by flanges at both ends.

[0010] To further define the above solution, the inner diameter of the insulating tube is matched with the outer diameter of the electrode to ensure that the electrode is stably inserted into the insulating tube.

[0011] Advantages of this utility model compared to the prior art: 1. This solution effectively solves the problems of gas leakage and poor insulation caused by misalignment of electrode holes in multi-layer heat insulation screens through an integrated sealed tube structure. The structure is simple, improves the sealing performance of electrode installation, and ensures the vacuum degree and temperature in the heat treatment furnace, thereby ensuring product quality. 2. In this design, the insulating tube and the sealing tube are fitted together seamlessly, which not only ensures insulation but also further enhances the sealing effect; 3. This solution has a simple structure, is easy to install, and is suitable for vacuum heat treatment furnaces of various specifications; 4. This solution uses molybdenum sealing tubes and ceramic insulating tubes, which are resistant to high temperatures, have good insulation properties, and have a long service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partially enlarged structural diagram of the sealing tube in this utility model.

[0013] In the diagram: 1-Insulation screen, 2-Electrode hole, 3-Sealing tube, 4-Outer end flange, 5-Inner end flange, 6-Insulating tube, 7-Electrode. Detailed Implementation

[0014] 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 scope of protection of the present utility model.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] Please see Figure 1-2 The embodiments of this utility model are described in detail below.

[0018] Example: This example provides a multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace. See details below. Figure 1 , Figure 2 As shown, the device includes a multi-layer heat insulation screen 1, each layer of which has an electrode hole 2, with the electrode holes 2 of each layer corresponding to each other inside and out. It also includes a sealing tube 3 that passes through the electrode holes 2 of each layer. The sealing tube 3 has outwardly flanged ends, and the sealing tube 3 is clearance-fitted with the electrode holes 2 of each layer of heat insulation screen 1, achieving axial compression sealing through the flanged ends.

[0019] For details, please refer to Figure 2 As shown, the outer end of the sealing tube 3 has an outer flange 4, and the inner end has an inner flange 5. The outer flange 4 is in close contact with the outer surface of the outermost heat insulation screen 1, and the inner flange 5 is in close contact with the inner surface of the innermost heat insulation screen 1, thereby achieving overall sealing of the multi-layer electrode holes.

[0020] Preferably, the sealing tube 3 is made of molybdenum or molybdenum alloy material, which has good high-temperature strength and sealing performance.

[0021] Preferably, both the outer end flange 4 and the inner end flange 5 adopt a rounded corner transition to avoid stress concentration and improve sealing reliability.

[0022] In this embodiment, see Figure 2 As shown, an insulating tube 6 is inserted inside the sealing tube 3, and the insulating tube 6 is fitted with the sealing tube 3 in a transitional manner; the electrode 7 passes through the insulating tube 6. The inner diameter of the insulating tube 6 matches the outer diameter of the electrode 7 to ensure that the electrode 7 is stably inserted in the insulating tube 6.

[0023] Preferably, the insulating tube 6 is made of 99% ceramic insulating tube, which has good insulation performance and high temperature resistance, and prevents arcing between the electrode and the sealing tube.

[0024] During installation, the sealing tube 3 is first inserted into the electrode holes 2 of each layer of heat insulation screen 1, and then pressed onto the heat insulation screen by the flanges at both ends to form a sealed structure. Next, the insulating tube 6 is inserted into the sealing tube 3, with a transition fit between the two to ensure there is no excessive gap between them. Finally, the electrode 7 is passed through the insulating tube 6 to complete the installation.

[0025] This invention achieves a complete seal for the electrode holes of a multi-layer heat insulation screen by using a molybdenum sealing tube with flanged ends, effectively preventing gas leakage caused by processing misalignment. The insulating tube not only ensures insulation between the electrode and the sealing tube, preventing arcing, but also further reduces potential micro-gaps, improving overall sealing and safety.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-layer electrode sealing installation structure for a vacuum heat treatment furnace, comprising multiple layers of heat insulation screens (1), each layer of the heat insulation screen (1) having electrode holes (2), the electrode holes (2) of each layer being correspondingly arranged inside and out; characterized in that: It also includes a sealing tube (3) that passes through the electrode holes (2) of each layer. The sealing tube (3) has an outer flange at both ends. The outer end of the sealing tube (3) is an outer flange (4), and the inner end is an inner flange (5). The outer flange (4) is in close contact with the outer surface of the outermost heat insulation screen (1), and the inner flange (5) is in close contact with the inner surface of the innermost heat insulation screen (1). An insulating tube (6) is inserted inside the sealing tube (3), and the insulating tube (6) is in transition fit with the sealing tube (3); the electrode (7) passes through the insulating tube (6).

2. The multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace according to claim 1, characterized in that: The sealing tube (3) is made of molybdenum or molybdenum alloy material.

3. The multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace according to claim 1, characterized in that: Both the outer end flange (4) and the inner end flange (5) adopt rounded corner bend transition.

4. The multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace according to claim 1, characterized in that: The insulating tube (6) is made of 99% ceramic insulating tube.

5. The multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace according to claim 1, characterized in that: The sealing tube (3) is fitted with the electrode holes (2) of each layer of heat insulation screen (1) with a gap, and the axial compression sealing is achieved by the flanges at both ends.

6. The multi-layer electrode sealing mounting structure for a vacuum heat treatment furnace according to claim 1, characterized in that: The inner diameter of the insulating tube (6) matches the outer diameter of the electrode (7) to ensure that the electrode (7) is stably inserted in the insulating tube (6).

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