CN219415744U

CN219415744U - Electrode insulation structure of high-temperature vacuum furnace

Info

Publication number: CN219415744U
Application number: CN202320636506.6U
Authority: CN
Inventors: 曲绍芬; 杨建川; 高光伟; 刘舒
Original assignee: SHENYANG HENGJIN VACUUM TECHNOLOGY CO LTD
Current assignee: SHENYANG HENGJIN VACUUM TECHNOLOGY CO LTD
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-07-25
Anticipated expiration: 2033-03-28

Abstract

The utility model relates to the technical field of high-temperature vacuum furnaces, in particular to an electrode insulation structure of a high-temperature vacuum furnace. The device comprises a graphite electrode, a heat insulation layer, a heating chamber shell and an electrode fixing assembly, wherein the heat insulation layer is arranged on the inner wall of the heating chamber shell, coaxial through holes are formed in the heating chamber shell and the heat insulation layer, the graphite electrode penetrates through the through holes, and an insulation gap is reserved between the graphite electrode and the through holes; the electrode fixing assembly is arranged on the outer side of the heating chamber shell and is used for fixing the graphite electrode on the heating chamber shell. The utility model adopts a special gap insulation mode to achieve a very good insulation effect, and meanwhile, the utility model has simple and practical structure and low cost, and is suitable for being used in a high-temperature vacuum furnace with the temperature of more than 1800 ℃.

Description

Electrode insulation structure of high-temperature vacuum furnace

Technical Field

The utility model relates to the technical field of high-temperature vacuum furnaces, in particular to an electrode insulation structure of a high-temperature vacuum furnace.

Background

The graphite has the advantages of good chemical stability, high temperature resistance, small deformation, low cost and the like. Graphite has been widely used in the field of high-temperature vacuum sintering and the like as a vacuum furnace for a heater. At present, a high-temperature vacuum furnace with the temperature of more than 1800 ℃ is generally used for insulating a graphite heater, if volatile matters exist in the vacuum furnace, the volatile matters can be accumulated at the insulating position of the boron nitride in the heating chamber for a long time, the graphite heater and a heat insulation layer are easy to be short-circuited, the insulating effect cannot be achieved, and meanwhile, the cost of the boron nitride is high and the economical efficiency is poor.

Disclosure of Invention

The utility model aims to provide an electrode insulation structure of a high-temperature vacuum furnace, which solves the problems that the existing graphite heater is insulated and is easy to accumulate volatile matters, short circuit is easily caused between the graphite heater and a heat insulation layer, and an insulation effect cannot be achieved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides an electrode insulation structure of a high-temperature vacuum furnace, which comprises a graphite electrode, a heat insulation layer, a heating chamber shell and an electrode fixing assembly, wherein the heat insulation layer is arranged on the inner wall of the heating chamber shell, coaxial through holes are formed in the heating chamber shell and the heat insulation layer, the graphite electrode penetrates through the through holes, and an insulation gap is reserved between the graphite electrode and the through holes; the electrode fixing assembly is arranged on the outer side of the heating chamber shell and is used for fixing the graphite electrode on the heating chamber shell.

In one possible implementation, the inner walls of the through holes of the heating chamber housing and the insulating layer are provided with an insulating layer structure.

In one possible implementation, the insulating layer structure comprises a CFC sleeve through which the graphite electrode passes, the CFC sleeve having an inner diameter greater than an outer diameter of the graphite electrode.

In one possible implementation manner, the electrode fixing assembly comprises a nut, a fixing disc, a connecting piece and an insulating ring, wherein the fixing disc is sleeved on the graphite electrode, the insulating ring is arranged between the fixing disc and the graphite electrode, and the insulating ring is locked by the nut connected to the graphite electrode through threads; the fixed disk is connected with the heating chamber shell through a connecting piece.

In one possible implementation, the center of the fixed disk is provided with a through hole, the end of the through hole is provided with a counter bore, and the insulating ring is positioned in the counter bore.

In one possible implementation, the nut and the fixing plate are made of graphite.

In one possible implementation manner, the edge of the fixing disc is provided with a plurality of connecting holes along the circumferential direction, the connecting piece comprises a plurality of bolts, the bolts are respectively connected with the connecting holes on the fixing disc, and an insulating part is arranged between the bolts and the connecting holes.

In one possible implementation, the insulating member includes two insulating seats respectively disposed at both ends of the connection hole.

In one possible implementation, the bolt is made of stainless steel; the insulating seat is made of ceramic.

In one possible implementation manner, a metal fixing ring coaxial with the through hole is arranged on the outer wall of the heating chamber shell, and the bolt is in threaded connection with the metal fixing ring.

The utility model has the advantages and beneficial effects that: the electrode insulation structure of the high-temperature vacuum furnace provided by the utility model adopts a special gap insulation mode, overcomes the defect that the boron nitride and ceramic component cannot achieve insulation effect in the high-temperature state in the prior art, has a simple and practical structure and low cost, and is suitable for being used in the high-temperature vacuum furnace in a state of more than 1800 ℃.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical scheme of the utility model is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

fig. 1 is a schematic view of an electrode insulation structure of a high temperature vacuum furnace according to the present utility model.

In the figure: 1. graphite electrode, 2, nut, 3, fixed disk, 4, metal fixed ring, 5, insulating layer, 6, CFC sleeve, 7, heating chamber shell, 8, insulating seat, 9, bolt, 10, insulating ring.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

The embodiment of the utility model provides an electrode insulation structure of a high-temperature vacuum furnace, which adopts a gap insulation mode, can achieve a better insulation effect and simultaneously reduces the cost. Referring to fig. 1, the electrode insulation structure of the high-temperature vacuum furnace comprises a graphite electrode 1, a heat insulation layer 5, a heating chamber shell 7 and an electrode fixing assembly, wherein the heat insulation layer 5 is arranged on the inner wall of the heating chamber shell 7, coaxial through holes are formed in the heating chamber shell 7 and the heat insulation layer 5, the graphite electrode 1 passes through the through holes, an insulation gap is reserved between the graphite electrode 1 and the through holes, and the insulation gap avoids short circuit between the graphite electrode 1 and the heat insulation layer 5 caused by accumulated volatile matters in the long-time heating process in the heating chamber; an electrode fixing assembly is provided outside the heating chamber housing 7, the electrode fixing assembly being for fixing the graphite electrode 1 to the heating chamber housing 7.

Referring to fig. 1, in the embodiment of the present utility model, an insulating layer structure is provided at the inner wall of the through hole of the heating chamber housing 7 and the insulating layer 5 to further improve the insulation between the graphite electrode 1 and the insulating layer 5.

In this embodiment, the insulating layer structure on the inner wall of the through-hole of the heating chamber housing 7 and the insulating layer 5 includes CFC sleeves 6, and the CFC sleeves 6 are fixed on the inner wall of the through-hole. The graphite electrode 1 passes through the CFC sleeve 6, and the inner diameter of the CFC sleeve 6 is larger than the outer diameter of the graphite electrode 1, so that a gap insulation structure is formed between the graphite electrode 1 and the CFC sleeve 6. Specifically, the end of the CFC sleeve 6 is provided with a limiting ring, and the CFC sleeve is attached to the outer surface of the heating chamber housing 7 through the limiting ring to axially limit the CFC sleeve. The CFC sleeve 6 is made of carbon fiber reinforced carbon composite material, which has the characteristics of high temperature resistance and low weight. The gap insulation structure between the graphite electrode 1 and the CFC sleeve 6 avoids the problem of short circuit between the graphite heater and the heat insulation layer 5 caused by accumulated volatile matters in the long-time heating process in the heating chamber, thereby achieving a better insulation effect.

In the embodiment of the utility model, the electrode fixing assembly comprises a nut 2, a fixing disc 3, a connecting piece and an insulating ring 10, wherein the fixing disc 3 is sleeved on the graphite electrode 1, the insulating ring 10 is arranged between the fixing disc 3 and the graphite electrode 1, the insulating ring 10 is locked by the nut 2 connected to the graphite electrode 1 through threads, the insulating ring 10 ensures insulation between the fixing disc 3 and the graphite electrode 1, and the fixing disc 3 is connected with the heating chamber shell 7 through the connecting piece, so that the graphite electrode 1 and the fixing disc 3 are fixed.

Preferably, the nut 2 and the fixing plate 3 are both made of graphite, and the graphite electrode 1 is made of graphite, so that the nut 2 is made of the same material, and thus the performance parameters and the like are the same. The fixing plate 3 is made of graphite material, has the characteristics of high temperature resistance and good strength under the heat radiation of the graphite electrode 1, and has no deformation.

Specifically, the center of the fixed disk 3 is provided with a through hole, the end of the through hole is provided with a counter bore, one end of the insulating ring 10 is positioned in the counter bore, and the other end is pressed by the two nuts 2, so that the stability of the structure is improved. Preferably, the insulating ring 10 is made of corundum.

In the embodiment of the utility model, a plurality of connecting holes are formed on the edge of the fixed disc 3 along the circumferential direction; the connecting piece comprises a plurality of bolts 9, the bolts 9 are respectively connected with each connecting hole on the fixed disk 3, and insulating parts are arranged between the bolts 9 and the connecting holes and ensure the insulation between the bolts 9 and the fixed disk 3.

In this embodiment, the insulating member includes two insulating holders 8, the two insulating holders 8 are respectively disposed at two ends of the connection hole, and the bolt 9 passes through the two insulating holders 8 and is connected to the heating chamber housing 7. The structure facilitates the installation and the disassembly of the insulating seat 8, improves the connection precision simultaneously, and ensures the coaxiality of the graphite electrode 1 and the CFC sleeve 6. The fixed disk 3 is clamped by two insulating seats 8 which are arranged up and down, and is fixed by bolts 9, so that the graphite electrode 1, the fixed disk 3 and the heating chamber shell 7 are fixed into a whole, and the strength of the whole structure is improved. Preferably, the bolt 9 is made of stainless steel, the insulating seat 8 is made of ceramic, and the insulating seat 8 ensures insulation between the bolt 9 and the fixed disc 3.

Further, for convenience of connection with the electrode fixing assembly, a metal fixing ring 4 coaxial with the through hole is provided on the outer wall of the heating chamber housing 7. In this embodiment, the metal fixing ring 4 is welded to the heating chamber housing 7, and other fixing connection methods may be used, which is not limited herein. The metal fixing ring 4 is provided with a plurality of threaded holes along the circumferential direction, and the plurality of threaded holes are respectively in one-to-one correspondence with the connecting holes arranged on the fixing plate 3 so as to be connected through bolts 9. The lower end of the bolt 9 is in threaded connection with a threaded hole on the metal fixing ring 4, so that the graphite electrode 1 and the fixing disc 3 can be conveniently installed and detached. Specifically, the metal fixing ring 4 may be replaced by a plurality of fixing blocks, and the plurality of fixing blocks are respectively in one-to-one correspondence with a plurality of connecting holes on the fixing disc 3. Screw holes are arranged on each fixed block so as to be connected with bolts 9.

In order to avoid short circuit between the graphite electrode 1 and the heat insulation layer 5 and between the graphite electrode 1 and the heating chamber shell 7 in the heating process, the electrode insulation structure of the high-temperature vacuum furnace provided by the embodiment of the utility model adopts a gap insulation structure at a high temperature. Specifically, a CFC sleeve 6 is arranged between the heat insulating layer 5 and the graphite electrode 1, so that an insulation gap is reserved between the heat insulating layer 5 and the graphite electrode 1, and the problem that a boron nitride and ceramic component cannot achieve an insulation effect in a high-temperature state in the prior art is solved. In particular, CFC sleeve 6 may be replaced with other materials having high temperature resistance and insulation. Meanwhile, the graphite electrode 1 is fixed with the fixed disc 3 through the insulating ring 10 and the two nuts 2, after the fixed disc 3 is clamped by the two insulating seats 8, the fixed disc is fixed with the heating chamber shell 7 by the bolts 9, and the graphite electrode is simple and practical in overall structure, high in reliability, low in cost, longer in service life at high temperature and suitable for being used in a high-temperature vacuum furnace in a state of more than 1800 ℃.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The electrode insulation structure of the high-temperature vacuum furnace is characterized by comprising a graphite electrode (1), a heat insulation layer (5), a heating chamber shell (7) and an electrode fixing assembly, wherein the heat insulation layer (5) is arranged on the inner wall of the heating chamber shell (7), coaxial through holes are formed in the heating chamber shell (7) and the heat insulation layer (5), the graphite electrode (1) penetrates through the through holes, and an insulation gap is reserved between the graphite electrode (1) and the through holes;

the electrode fixing component is arranged on the outer side of the heating chamber shell (7) and is used for fixing the graphite electrode (1) on the heating chamber shell (7).

2. Electrode insulation structure of a high temperature vacuum furnace according to claim 1, characterized in that the through hole inner walls of the heating chamber housing (7) and the insulating layer (5) are provided with insulation layer structures.

3. Electrode insulation structure of a high temperature vacuum furnace according to claim 2, characterized in that the insulation layer structure comprises CFC-sleeves (6), the graphite electrode (1) passing through the CFC-sleeves (6), the inner diameter of the CFC-sleeves (6) being larger than the outer diameter of the graphite electrode (1).

4. The electrode insulation structure of the high-temperature vacuum furnace according to claim 1, wherein the electrode fixing assembly comprises a nut (2), a fixing disc (3), a connecting piece and an insulation ring (10), wherein the fixing disc (3) is sleeved on the graphite electrode (1), the insulation ring (10) is arranged between the fixing disc (3) and the graphite electrode (1), and the insulation ring (10) is locked by the nut (2) connected to the graphite electrode (1) through threads; the fixed disk (3) is connected with the heating chamber shell (7) through a connecting piece.

5. Electrode insulation structure of a high temperature vacuum furnace according to claim 4, characterized in that the center of the fixed disk (3) is provided with a through hole, the end of the through hole is provided with a counter bore, and the insulating ring (10) is positioned in the counter bore.

6. The electrode insulation structure of the high temperature vacuum furnace according to claim 4, wherein the nut (2) and the fixing plate (3) are made of graphite.

7. The electrode insulation structure of the high temperature vacuum furnace according to claim 4, wherein the edge of the fixed disk (3) is provided with a plurality of connecting holes along the circumferential direction;

the connecting piece comprises a plurality of bolts (9), the bolts (9) are respectively connected with the connecting holes on the fixed disc (3), and insulating parts are arranged between the bolts (9) and the connecting holes.

8. The electrode insulation structure of the high temperature vacuum furnace according to claim 7, wherein the insulation member comprises two insulation seats (8), and the two insulation seats (8) are respectively provided at both ends of the connection hole.

9. The electrode insulation structure of the high temperature vacuum furnace according to claim 8, wherein the bolt (9) is made of stainless steel; the insulating seat (8) is made of ceramic.

10. The electrode insulation structure of the high-temperature vacuum furnace according to claim 7, wherein a metal fixing ring (4) coaxial with the through hole is arranged on the outer wall of the heating chamber shell (7), and the bolt (9) is in threaded connection with the metal fixing ring (4).