Furnace cover, furnace structure and graphitization furnace

Abstract

The utility model relates to a furnace cover, a furnace structure and a graphitization furnace. The furnace cover comprises an inner ring and an outer ring. The inner ring is provided with a first surface extending in the circumferential direction of the inner ring, and the first surface is provided with a first matching part. The outer ring is provided with a second surface extending in the circumferential direction of the outer ring, the second surface is arranged on the side, close to the inner ring, of the outer ring, the second surface is provided with a second matching part, and the second matching part is detachably connected with the first matching part. According to the technical scheme, when the furnace cover is assembled, the first matching part of the inner ring and the second matching part of the outer ring are connected together to be assembled into the complete furnace cover. Thus, the connection mode between the inner ring and the outer ring is simplified, the inner ring and the outer ring can be conveniently connected together to form the furnace cover, and therefore the furnace cover can be installed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment furnace, in particular to a furnace cover, a furnace structure and a graphitization furnace. BACKGROUND

[0002] The graphitization furnace is a device for providing a high-temperature treatment environment for materials. The performance and service life of the graphitization furnace are crucial to the quality of heat treatment of the materials. The traditional graphitization furnace has a large volume and a very cumbersome installation process, thereby affecting the entire process of the graphitization furnace. Therefore, there is an urgent need for a furnace cover that is easy to install and has good heat preservation effect. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a furnace cover, a furnace structure and a graphitization furnace, which can alleviate the problem of inconvenient installation of the furnace cover.

[0004] In the first aspect, the present application provides a furnace cover, which comprises an inner ring and an outer ring. The inner ring has a first surface extending along the circumferential direction of the inner ring, and the first surface is provided with a first matching part. The outer ring has a second surface extending along the circumferential direction of the outer ring, and the second surface is provided on the side of the outer ring close to the inner ring. The second surface is provided with a second matching part, and the second matching part is detachably connected with the first matching part.

[0005] In the technical scheme of the present application, the first matching part of the inner ring and the second matching part of the outer ring are connected together to assemble a complete furnace cover. In this way, the connection mode between the inner ring and the outer ring is simplified, and the inner ring and the outer ring are easily connected together to form a furnace cover, thereby facilitating the installation of the furnace cover.

[0006] In some embodiments, the inner ring comprises an inner ring body, and the inner ring body comprises the first surface. Part of the first surface is recessed along the radial direction of the inner ring body to form the first matching part.

[0007] The outer ring comprises an outer ring body, and the outer ring body comprises the second surface. The second matching part is protrudingly arranged relative to the outer ring body, and the second matching part supports the first matching part.

[0008] In this way, the structure of the first matching part and the structure of the second matching part are simplified, the first matching part and the second matching part are easily produced and processed, and the difficulty of connecting the first matching part and the second matching part together is reduced.

[0009] In some embodiments, the furnace cover further comprises a heat preservation assembly, and the heat preservation assembly is detachably connected with the outer ring body.

[0010] Therefore, the heat preservation assembly can prevent the heat in the furnace body from being directly transmitted to the furnace cover and dissipated to the air through the furnace cover, so that the temperature of the surface of the furnace cover is prevented from being too high and the heat dissipation is reduced. In addition, the heat preservation assembly and the outer ring body are arranged in a detachable manner, so that when any one of the heat preservation assembly and the outer ring body is damaged, the damaged part can be replaced with a new part, thereby reducing the maintenance cost compared with replacing the heat preservation assembly and the outer ring body together.

[0011] In some embodiments, the outer ring body is provided with an annular accommodating groove, and the annular accommodating groove is provided with the heat preservation assembly.

[0012] Therefore, compared with arranging an additional component on the outer ring body to install the heat preservation assembly, arranging an annular accommodating groove in the outer ring body to install the heat preservation assembly can reduce the weight of the outer ring body and thus the weight of the furnace cover. In addition, the heat preservation assembly is directly placed in the annular accommodating groove, thereby simplifying the installation mode of the heat preservation assembly.

[0013] In some embodiments, the second matching part is detachably connected with the outer ring body in the radial direction of the outer ring body to block part of the annular accommodating groove and limit the heat preservation assembly in the radial direction of the outer ring body.

[0014] Therefore, because the second matching part can block the opening of the annular accommodating groove in the radial direction, the second matching part can limit the heat preservation assembly in the radial direction, thereby reducing the probability that the heat preservation assembly is exposed outside the annular accommodating groove in the radial direction. In addition, the connection between the second matching part and the outer ring body is detachable, so that when any one of the second matching part and the outer ring body is damaged, the damaged part can be replaced with a new part, thereby reducing the maintenance cost of the furnace cover compared with replacing the second matching part and the outer ring body together.

[0015] In some embodiments, the annular accommodating groove comprises an inner ring segment and an outer ring segment connected with each other, and the groove bottom wall of the inner ring segment is arranged to be inclined away from the furnace body relative to the groove bottom wall of the outer ring segment, wherein the furnace cover covers the furnace body.

[0016] Therefore, without affecting the stress of the annular accommodating groove, the distance between the inner ring segment and the inside of the furnace body is greater than the distance between the outer ring segment and the inside of the furnace body. When there is carbonaceous material in the furnace body, the distance between the inner ring segment and the carbonaceous material is greater than the distance between the outer ring segment and the carbonaceous material. Therefore, the distance between part of the heat preservation assembly and the carbonaceous material contained in the inside of the furnace body is increased, thereby reducing the influence of the high-temperature carbonaceous material on the heat preservation assembly and prolonging the service life of the heat preservation assembly.

[0017] In some embodiments, the outer ring body comprises a high-temperature-resistant layer, and the high-temperature-resistant layer is arranged on the side of the inner ring segment facing the furnace body.

[0018] In this way, when the carbonaceous material in the furnace body starts to react, the heat generated can be effectively blocked by the high-temperature-resistant layer, thereby reducing the amount of heat directly entering the inside of the furnace cover, further affecting the use of the furnace cover, and prolonging the service life of the furnace cover.

[0019] In some embodiments, the annular accommodating groove is provided with a fixing member, and the fixing member is connected with the heat preservation assembly.

[0020] In this way, the stability of the heat preservation assembly installed in the annular accommodating groove is improved, and the probability of the heat preservation assembly being detached from the annular accommodating groove is reduced.

[0021] In some embodiments, the heat preservation assembly comprises a heat insulation layer and a heat preservation sealing layer, the heat insulation layer and the heat preservation sealing layer are stacked along the thickness direction of the outer ring body, and the heat insulation layer is arranged closer to the furnace body than the heat preservation sealing layer.

[0022] In this way, the heat preservation assembly is constructed as a multi-layer structure, which can gradually reduce the heat transferred outward by the furnace body, helps to improve the heat insulation effect of the furnace cover, reduces the heat loss, so that the heat can be maintained in the furnace structure formed by the combination of the furnace body and the furnace cover, to stably maintain the high temperature in the furnace structure and achieve higher material processing efficiency.

[0023] In some embodiments, along the direction away from the furnace body, the heat insulation layer comprises a fire-resistant sub-layer, a heat insulation sub-layer and a heat preservation sub-layer which are sequentially stacked.

[0024] In summary, the heat insulation layer is provided as multiple sub-layers with different performances along the layer thickness direction, which can further improve the heat insulation effect of the furnace cover.

[0025] In some embodiments, the furnace cover further comprises an insulating member, and the insulating member is arranged on the first surface and on the side of the outer ring radially away from the first surface.

[0026] In this way, during the installation process, the insulating property can be improved, and the probability of the graphite electrode being oxidized can be reduced.

[0027] In some embodiments, the inner ring is provided with a first gas injection hole, and the first gas injection hole penetrates the inner ring along the axial direction of the inner ring for injecting non-oxygen gas.

[0028] In this way, by injecting non-oxygen gas into the inside of the furnace body through the first gas injection hole in the furnace cover, the graphite electrode and the produced graphite material in the inside of the furnace body can be prevented from being oxidized, and the production performance of the graphitization furnace and the quality of the graphite material can be affected.

[0029] In some embodiments, the outer ring is provided with a second gas injection hole, and the second gas injection hole penetrates the outer ring along the axial direction of the outer ring for injecting non-oxygen gas.

[0030] In this way, by introducing the non-oxygen gas into the interior of the furnace body through the second gas injection hole in the furnace cover, the oxygen can be prevented from entering the interior of the furnace body, and the graphite electrodes and the produced graphite material in the interior of the furnace body can be prevented from being oxidized, so as to affect the production performance of the graphitization furnace and the quality of the graphite material.

[0031] In a second aspect, the application provides a furnace structure, which comprises a furnace body and a furnace cover as described in the above embodiments.

[0032] In a third aspect, the application provides a graphitization furnace, which comprises the furnace structure as described in the above embodiments.

[0033] The above description is only a summary of the technical solutions of the application, in order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0035] Figure 1 A sectional view of a heat insulation layer of the furnace cover according to one or more embodiments is a single-layer structure.

[0036] Figure 2 A sectional view of a heat insulation layer of the furnace cover according to one or more embodiments is a multi-layer structure.

[0037] Figure 3 A top view of the furnace cover according to one or more embodiments.

[0038] Figure 4 A sectional view of the graphitization furnace according to one or more embodiments.

[0039] The reference numerals in the detailed description are as follows:

[0040] 1000, a graphitization furnace;

[0041] 100, a furnace body; 200, a furnace cover;

[0042] 10, an inner ring; 11, a first matching part; 12, an inner ring body; 13, a first gas injection hole;

[0043] 20, outer ring; 21, second fitting part; 22, outer ring body; 221, annular accommodating groove; 2211, inner ring segment; 2212, outer ring segment; 222, high-temperature-resistant layer; 23, second gas injection hole;

[0044] 30, heat preservation assembly; 31, heat insulation layer; 311, refractory sub-layer; 312, heat insulation sub-layer; 313, heat preservation sub-layer; 32, heat preservation plugging layer; 40, insulating piece. DETAILED DESCRIPTION

[0045] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of the present application, if the technical terms "first", "second", etc. appear, they are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0048] In this paper, the term "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments of the present application, if the term "and / or" appears, it only describes the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, if it appears, the character " / " in this paper generally represents a "or" relationship between the associated objects.

[0050] In the description of the embodiments of the present application, if any, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0051] In the description of the embodiments of the present application, if any, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, if any, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] The graphitization furnace is generally used to provide a high-temperature processing environment for materials. Among them, the materials can be carbon materials, coal or other substances that need to be high-temperature processed. Taking the materials as carbon materials as an example, the graphitization furnace converts carbon atoms from a random layer structure to an ordered graphite crystal structure by heating, mainly for realizing the graphitization processing of carbon materials. The graphitization furnace can be used for sintering and graphitization of carbon materials, graphitization of Polymide Film (PI) film, graphitization of heat-conducting materials, sintering of carbon fiber ropes, sintering and graphitization of carbon fiber filaments, graphite purification and high-temperature processing of other materials that can be graphitized in a carbon environment. In some specific applications, the graphitized materials treated by the graphitization furnace can be used to form negative materials of batteries. For example, graphite can be used as the negative material of the current lithium battery.

[0054] The structure of the current furnace cover of the graphitization furnace is complex, which causes the furnace cover to be inconvenient to install, thereby affecting the overall progress of the operation of the graphitization furnace.

[0055] To address the technical problem of inconvenient furnace cover installation, this application provides a furnace cover comprising an inner ring and an outer ring, wherein a first mating portion of the inner ring can be detachably connected to a second mating portion of the outer ring. When the inner and outer rings are assembled together, they form a complete furnace cover, facilitating its installation and removal.

[0056] The furnace cover provided in this application can be applied to furnace structures in graphitization furnaces, and can also be applied to furnace structures in other types of heat treatment furnaces, such as smelting furnaces. This application does not limit the type of heat treatment furnace to which the furnace cover is applied. For ease of explanation, the following embodiments all use the application of the furnace cover in a graphitization furnace as an example for illustration.

[0057] Besides being used to produce graphitized materials for battery anodes, graphitization furnaces can also be applied to any graphite production system. Examples include sintering and graphitization systems for carbon materials, graphitization systems for PI films, graphitization systems for thermally conductive materials, sintering and graphitization systems for carbon fiber ropes / filaments, graphite purification systems, and so on. This application does not limit the specific application scenarios of this graphitization furnace.

[0058] For ease of explanation, the following examples all use graphitization furnaces for producing graphitized materials for battery negative electrodes as an example.

[0059] The furnace cover involved in the embodiments of this application will be described in detail below.

[0060] like Figure 1 As shown, some embodiments of this application provide a furnace cover 200, which includes an inner ring 10 and an outer ring 20. The inner ring 10 has a first surface extending circumferentially, and the first surface is provided with a first mating portion 11. The outer ring 20 has a second surface extending circumferentially, the second surface is provided on the side of the outer ring 20 near the inner ring 10, and the second surface is provided with a second mating portion 21, which is detachably connected to the first mating portion 11.

[0061] The inner ring 10 can be made of corundum material, and may also be doped with zirconium, chromium, aluminum nitride, etc., to improve the temperature resistance, erosion resistance, corrosion resistance, and strength of the inner ring 10. The inner ring 10 has a feed inlet for material to pass through the furnace cover 200. The feed inlet can be located in the middle of the inner ring 10 and extends through the inner ring 10 along its axial direction. The first surface of the inner ring 10 is located away from the center of the inner ring 10 relative to the feed inlet. The first mating part 11 can be, but is not limited to, configured as a protrusion or a groove.

[0062] The outer ring 20 may be made of steel, and the second mating part 21 of the outer ring 20 may be configured as a corresponding groove or protrusion. The connection between the first mating part 11 and the second mating part 21 may be, but is not limited to, a snap-fit ​​or a flange connection.

[0063] The inner ring 10 and the outer ring 20 together form a complete furnace cover 200. When the furnace cover 200 is closed on the furnace body 100, the furnace body 100 supports the outer ring 20. The outer ring 20 and the inner ring 10 are connected, and the inner ring 10 is suspended above the furnace body 100.

[0064] With this configuration, when assembling the furnace cover 200, the first mating part 11 of the inner ring 10 and the second mating part 21 of the outer ring 20 are connected together to form a complete furnace cover 200. This simplifies the connection method between the inner ring 10 and the outer ring 20, making it easier to connect the inner ring 10 and the outer ring 20 together to form the furnace cover 200, thereby facilitating the installation of the furnace cover 200.

[0065] In some embodiments, the inner ring 10 includes an inner ring body 12, the inner ring body 12 includes a first surface, a portion of the first surface is recessed along the radial direction of the inner ring body 12 to form a first mating portion 11; the outer ring 20 includes an outer ring body 22, the outer ring body 22 includes a second surface, a second mating portion 21 is protruding relative to the outer ring body 22, and the second mating portion 21 supports the first mating portion 11.

[0066] For example, along the radial direction of the inner ring body 12, a portion of the first surface of the inner ring body 12 is recessed to form a groove, which is configured as a first mating part 11. A support block is protruding from the second surface of the outer ring body 22. When assembling the inner ring 10 and the outer ring 20 together, the inner ring body 12 can be first hoisted above the outer ring body 22, and then the support block can be inserted into the groove until the groove wall contacts the support block. After the external force of hoisting the inner ring body 12 is removed, the entire inner ring body 12 is supported by the support block.

[0067] This design not only simplifies the structure of the first mating part 11 and the second mating part 21, making it easier to manufacture and process the first mating part 11 and the second mating part 21, but also reduces the difficulty of connecting the first mating part 11 and the second mating part 21 together.

[0068] It should be noted that in some examples, the first mating part 11 is constructed as an annular groove, and the second mating part 21 is constructed as an annular support block. In other examples, there are multiple first mating parts 11, which are distributed at intervals along the first surface. The number of second mating parts 21 is equal to the number of first mating parts 11, and there is a one-to-one correspondence between the first mating parts 11 and the second mating parts 21.

[0069] like Figure 1 As shown, the outer ring body 22 is also provided with lifting lugs to facilitate the lifting of the outer ring 20 to a preset position.

[0070] Please continue reading. Figure 1In some embodiments, the furnace cover 200 further comprises a heat preservation assembly 30, which is detachably connected with the outer ring body 22.

[0071] The heat preservation assembly 30 can be made of fiber and covers the outer ring body 22 along the thickness direction of the outer ring body 22. For example, hooks are arranged on the outer ring body 22 and can be inserted into the heat preservation assembly 30 to fix the heat preservation assembly 30. It can be understood that in some examples, the connection between the heat preservation assembly 30 and the outer ring body 22 can also be, but is not limited to, a clamping connection or the like.

[0072] For example, when the furnace cover 200 is covered on the furnace body 100, the core temperature in the furnace body 100 is before 2800-3000℃, the heat preservation assembly 30 can block the heat in the furnace body 100 from being directly transmitted to the furnace cover 200 and dissipated to the air through the furnace cover 200, so as to prevent the temperature of the surface of the furnace cover 200 from being too high and reduce the heat dissipation. In addition, the heat preservation assembly 30 and the outer ring body 22 are arranged in a detachable manner, so that when any one of the heat preservation assembly 30 and the outer ring body 22 is damaged, the damaged part can be replaced with a new part, which reduces the maintenance cost compared with replacing the heat preservation assembly 30 and the outer ring body 22 together.

[0073] Specifically, as shown in Figure 2 In some embodiments, the outer ring body 22 is provided with an annular accommodating groove 221, and the heat preservation assembly 30 is arranged in the annular accommodating groove 221. The annular accommodating groove 221 can be made of carbon steel or stainless steel material or the like.

[0074] In this way, compared with arranging an additional part on the outer ring body 22 to install the heat preservation assembly 30, arranging an annular accommodating groove 221 in the outer ring body 22 to install the heat preservation assembly 30 can reduce the weight of the outer ring body 22, thereby reducing the weight of the furnace cover 200. In addition, the heat preservation assembly 30 is directly placed in the annular accommodating groove 221, which simplifies the installation mode of the heat preservation assembly 30.

[0075] When the outer ring body 22 is made of a steel shell, the ratio of the thickness of the outer ring body 22 to the thickness of the heat preservation assembly 30 ranges from 1:10 to 1:30, and the optimal thickness ratio ranges from 1:12 to 1:20. The ratio of the thermal conductivity coefficient of the outer ring body 22 to the thermal conductivity coefficient of the heat preservation assembly 30 ranges from 600:1 to 200:1, and the optimal thermal conductivity coefficient ratio ranges from 320:1 to 210:1.

[0076] In this way, the thickness of the outer ring body 22 and the thickness of the heat preservation assembly 30 and the thermal conductivity coefficient of the outer ring body 22 and the thermal conductivity coefficient of the heat preservation assembly 30 can be adjusted according to the actual situation, thereby improving the heat preservation effect of the furnace cover 200.

[0077] Referring to Figure 2 In some embodiments, the second fitting part 21 is detachably connected with the outer ring body 22 in the radial direction of the outer ring body 22 to block part of the annular accommodating groove 221 and limit the heat preservation assembly 30 in the radial direction of the outer ring body 22.

[0078] In other words, the connection between the second fitting part 21 and the outer ring body 22 can be, but is not limited to, a mortise and tenon joint or a clamping joint. The annular accommodating groove 221 has two openings, and the opening directions of the two openings are respectively towards the axial direction and the radial direction of the outer ring body 22. The second fitting part 21 is arranged in the radial direction of the outer ring body 22 and blocks the opening in the radial direction. In this way, the heat preservation assembly 30 can be placed in the annular accommodating groove 221 in the axial direction.

[0079] Because the second fitting part 21 can block the opening of the annular accommodating groove 221 in the radial direction, the second fitting part can limit the heat preservation assembly 30 in the radial direction, which can reduce the probability of the heat preservation assembly 30 being exposed outside the annular accommodating groove 221 in the radial direction. In addition, because the connection between the second fitting part 21 and the outer ring body 22 is detachable, when any one of the second fitting part 21 and the outer ring body 22 is damaged, the damaged part can be replaced with a new part, which reduces the maintenance cost of the furnace cover 200 compared with replacing the second fitting part 21 and the outer ring body 22 together.

[0080] Please continue to refer to Figure 2 In some embodiments, the annular accommodating groove 221 includes an inner ring segment 2211 and an outer ring segment 2212 connected with each other, and the groove bottom wall of the inner ring segment 2211 is arranged to be inclined away from the furnace body 100 relative to the groove bottom wall of the outer ring segment 2212, wherein the furnace cover 200 covers the furnace body 100.

[0081] For example, the included angle between the inner ring segment 2211 and the outer ring segment 2212 is an obtuse angle. When the heat preservation assembly 30 is arranged in the annular accommodating groove 221, the heat preservation assembly 30 fills the entire annular accommodating groove 221, so that the surface of the heat preservation assembly 30 in contact with the bottom wall of the annular accommodating groove 221 is in a bent shape.

[0082] In this way, without affecting the stress of the annular accommodating groove 221, the distance between the inner ring segment 2211 and the inside of the furnace body 100 is greater than the distance between the outer ring segment 2212 and the inside of the furnace body 100. When there is carbonaceous material in the furnace body 100, the distance between the inner ring segment 2211 and the carbonaceous material is also greater than the distance between the outer ring segment 2212 and the carbonaceous material. Therefore, the distance between part of the heat preservation assembly 30 and the carbonaceous material contained in the inside of the furnace body 100 is increased, thereby reducing the influence of the high-temperature carbonaceous material on the heat preservation assembly 30 and prolonging the service life of the heat preservation assembly 30.

[0083] Furthermore, such as Figure 2 As shown, in some embodiments, the outer ring body 22 includes a high-temperature resistant layer 222, which is correspondingly disposed on the side of the inner ring section 2211 facing the furnace body 100.

[0084] The high-temperature resistant layer 222 can be prepared using nanoscale castable material and possesses thermal insulation properties. The high-temperature resistant layer 222 can withstand temperatures ranging from 1200℃ to 1600℃. The thickness ratio of the high-temperature resistant layer 222 to the insulation component 30 is 1:5 to 1:500. The thermal insulation effect is optimal when the thickness ratio of the high-temperature resistant layer 222 to the insulation component 30 is between 1:5 and 1:30.

[0085] When the furnace cover 200 is placed on the furnace body 100, the heat generated by the carbonaceous material inside the furnace body 100 can be effectively blocked by the high-temperature resistant layer 222, thereby reducing the amount of heat that directly enters the interior of the furnace cover 200 and thus affecting the use of the furnace cover 200, and extending the service life of the furnace cover 200.

[0086] Furthermore, in some embodiments, a fixing member (not shown in the figure) is provided in the annular placement groove 221, and the fixing member is connected to the heat insulation component 30.

[0087] For example, the annular receiving groove is provided with tenon and mortise hooks, which are constructed as fasteners. The tenon and mortise hooks can be made of carbon steel or stainless steel to improve their high-temperature resistance. During the placement of the insulation component 30 into the annular receiving groove, the fasteners can be inserted into the insulation component 30 to secure it.

[0088] This design improves the stability of the insulation component 30 installed in the annular receiving groove 221 and reduces the probability of the insulation component 30 falling out of the annular receiving groove.

[0089] It should be noted that in some embodiments, the annular mounting groove 221 is provided with multiple fasteners, which act simultaneously on the insulation component 30 to fix the insulation component 30 in multiple directions.

[0090] In some embodiments, the heat insulation component 30 includes a heat insulation layer 31 and a heat insulation sealing layer 32, which are stacked along the thickness direction of the outer ring body 22, and the heat insulation layer 31 is disposed closer to the furnace body 100 than the heat insulation sealing layer 32.

[0091] The heat preservation and sealing layer 32 can be coated on the surface of the first heat insulation layer 31 using a slurry formed by mixing alumina and nanosilica, and the mixing ratio of the alumina and the nanosilica can be set as needed. The alumina has high temperature resistance, and the nanosilica is mainly used for sealing holes. The heat preservation and sealing layer 32 formed by curing the slurry formed by mixing the alumina and the nanosilica has not only good fire resistance and temperature resistance, but also can seal the pores on the heat insulation layer 31. In addition, the heat preservation and sealing layer 32 also has high fire resistance and high temperature resistance.

[0092] The heat insulation layer 31 can be made of a porous material with good strength and fire resistance and high temperature resistance, such as a zirconium-containing ceramic fiber module, a chromium-containing ceramic fiber module, an alumina fiber module, a ceramic fiber module, and other fiber modules made of alumina as the main component, etc. Among them, the alumina as the main component means that the proportion of alumina must be at least more than fifty percent.

[0093] When the furnace cover 200 covers the furnace body 100, the heat insulation layer 31 is closer to the furnace body 100 than the heat preservation and sealing layer 32. The hot gas in the furnace body 100 is first blocked by the heat insulation layer 31, and then blocked by the heat preservation and sealing layer 32.

[0094] In this way, the heat preservation assembly 30 is constructed as a multi-layer structure, which can gradually reduce the heat transferred outward by the furnace body 100, helps to improve the heat insulation and heat preservation effect of the furnace cover 200, reduces the loss of heat, so that a large amount of heat can be maintained in the furnace structure formed by the combination of the furnace body 100 and the furnace cover 200, to stably maintain the high temperature in the furnace structure and achieve higher material processing efficiency.

[0095] Specifically, in some embodiments, along the direction away from the furnace body 100, the heat insulation layer 31 includes a fire-resistant sub-layer 311, a heat insulation sub-layer 312, and a heat preservation sub-layer 313 arranged in sequence.

[0096] The fire-resistant sub-layer 311 is mainly made of heavy refractory material, and has high density, high fire resistance and strong wear resistance, and is mainly used for fire resistance and heat insulation in high temperature environment. The heat insulation sub-layer 312 is mainly made of light heat insulation material, and has low density, high heat preservation and good heat insulation performance. The heat preservation sub-layer 313 is mainly made of ceramic fiber and other materials.

[0097] Exemplarily, when the cover 200 is combined with the furnace body 100, the refractory sublayer 311 is closest to the furnace body 100 relative to the other two sublayers, and thus the position of the refractory sublayer 311 has the highest temperature. Because the refractory sublayer 311 has a stronger heat insulation performance than the other two sublayers, a barrier layer can be formed to block a large amount of hot air in the furnace body 100 from passing through the refractory sublayer 311 and reduce the probability of self-ignition of the refractory sublayer 311 itself. The heat insulation sublayer 312 and the heat preservation sublayer 313 can further keep a large amount of heat in the furnace structure formed by the combination of the furnace body 100 and the cover 200, so as to stably maintain a high temperature in the furnace structure and achieve a higher material processing efficiency.

[0098] In summary, the heat insulation layer 31 is provided with multiple sublayers with different performances along the layer thickness direction, which can further improve the heat insulation and heat preservation effect of the cover 200.

[0099] It can be understood that the heat insulation layer 31 can also be configured as a single-layer structure, for example, in the case that the heat insulation layer 31 is configured as a single-layer structure, the heat insulation layer 31 can be made of a material with a relatively low density, such as graphite, and the heat insulation layer 31 can be directly combined with the cover 200. Figure 1 In the example shown, the heat insulation layer 31 is configured as a single-layer structure. Of course, the heat preservation sealing layer 32 can also be configured as a single-layer structure or a multi-layer structure.

[0100] In some embodiments, the cover 200 further comprises an insulating piece 40, which is arranged on the first surface and on the side of the outer ring 20 radially away from the first surface.

[0101] The insulating piece 40 can be configured as an insulating pad. For example, the outer peripheral edge of the inner ring 10 and the outer ring 20 can each be provided with an insulating piece 40. During installation, the insulating property can be improved, and the probability of oxidation of the graphite electrode can be reduced.

[0102] As shown in Figure 3 In some embodiments, the inner ring 10 is provided with a first gas injection hole 13, which penetrates the inner ring 10 along the axial direction of the inner ring 10 to inject a non-oxygen gas.

[0103] The non-oxygen gas can be, for example, nitrogen. By introducing the non-oxygen gas into the interior of the furnace body 100 through the first gas injection hole 13 in the cover 200, the oxygen can be prevented from entering the interior of the furnace body 100, and the graphite electrode and the produced graphite material in the interior of the furnace body 100 can be prevented from being oxidized, so as to affect the production performance of the graphitization furnace 1000 and the quality of the graphite material.

[0104] The above-mentioned first gas injection hole 13 can be configured as a circular hole, and multiple first gas injection holes 13 are uniformly distributed on the outer peripheral edge of the inner ring 10. It can be understood that the multiple first gas injection holes 13 can be distributed on the outer peripheral edge of the inner ring 10 in other forms, such as a plurality of first gas injection holes 13 arranged in a row along the circumferential direction of the inner ring 10. Figure 3The holes are evenly distributed outside the furnace cover 200 as shown, but they can also be evenly or non-uniformly distributed on the furnace cover 200 in other ways. The specific distribution of the multiple first gas injection holes 13 is not limited in the embodiments of this application.

[0105] Please continue reading. Figure 3 In some embodiments, the outer ring 20 is provided with a second air injection hole 23, which extends through the outer ring 20 along the axial direction of the outer ring 20 to allow the injection of non-oxygen gas.

[0106] The non-oxygen gas can be, for example, nitrogen. By introducing non-oxygen gas into the furnace body 100 through the second gas injection hole 23 in the furnace cover 200, oxygen can be prevented from entering the furnace body 100 and causing oxidation to the graphite electrodes and graphite materials produced inside the furnace body 100, thus affecting the production performance of the graphitization furnace 1000 and the quality of the graphite materials.

[0107] The aforementioned second air injection hole 23 can be constructed as a circular hole, and multiple second air injection holes 23 are evenly distributed on the outer periphery of the inner ring 10. It is understood that the multiple second air injection holes 23, in addition to serving as… Figure 3 The holes are evenly distributed outside the furnace cover 200 as shown, but they can also be evenly or non-uniformly distributed on the furnace cover 200 in other ways. The specific distribution of the multiple second gas injection holes 23 is not limited in the embodiments of this application.

[0108] like Figure 4 As shown, some embodiments of this application also provide a furnace structure, which includes a furnace body 100 and a furnace cover 200 as described in any of the above embodiments. The furnace body 100 has a furnace opening, and the furnace cover 200 covers the furnace opening of the furnace body 100.

[0109] Generally, the furnace body 100 is the structure of the graphitization furnace 1000 that provides a high-temperature environment for the material. Under normal circumstances, the high-temperature environment provided by the furnace body 100 is isolated from the atmosphere. The high-temperature environment it provides can be a vacuum environment, an atmospheric environment (such as a nitrogen atmosphere, an inert gas atmosphere, a reducing atmosphere), etc., depending on the specific requirements.

[0110] Typically, the furnace opening is a channel structure on the furnace body 100 that allows materials to enter the furnace body 100. The through hole of the furnace cover 200 is usually directly connected to the furnace opening, and the materials enter the furnace body 100 through the through hole and the furnace opening.

[0111] Specifically, the furnace cover 200 is fitted over the furnace opening of the furnace body 100. The furnace cover 200 and the furnace opening are typically sealed together. The sealing method can be by filling the space between the two with sealing material, or by designing the furnace cover 200 and the furnace body 100 to have a concave-convex fit to provide a sealing effect.

[0112] The furnace structure described above has all the beneficial effects of the furnace cover 200 described above, which will not be elaborated here.

[0113] As Figure 4 shown, some embodiments of the present application also provide a graphitization furnace 1000, which comprises a furnace structure as in any of the above embodiments.

[0114] The graphitization furnace 1000 comprises all the beneficial effects described above, which will not be repeated here.

[0115] In one or more embodiments of the present application, the graphitization furnace 1000 can further comprise an electrode member in addition to the furnace structure, which can be a negative electrode member or a positive electrode member, and is a conductor capable of conducting current, and the specific material can be graphite, metal, etc. The electrode member penetrating the furnace cover 200 is referred to as a first electrode member, and generally, a second electrode member is also provided on the furnace body 100, which cooperates with the first electrode member to generate a core temperature area inside the furnace body 100 that can achieve material heating. Generally, the first electrode member and the second electrode member are oppositely and spacedly arranged in the thickness direction of the furnace cover 200. Wherein, opposite means that the projection of the first electrode member and the projection of the second electrode member intersect along the thickness direction of the furnace cover 200. Specifically, the first electrode member is any one of a positive electrode member and a negative electrode member, and the second electrode member is the other one of the positive electrode member and the negative electrode member.

[0116] In some cases, the first electrode member and the second electrode member can directly heat the material passing through the core temperature area, at which time the material passing through the core temperature area can conduct current and itself heat by resistance to achieve heating. In other cases, the first electrode member and the second electrode member can also indirectly heat the material passing through the core temperature area, for example, arranging a heating wire in the core temperature area, the heating wire being electrically connected between the first electrode member and the second electrode member, and the first electrode member and the second electrode member being energized to heat the heating wire, and the material being heated by the heat radiated or conducted by the heating wire to achieve indirect heating of the material. The specific scheme of how the electrode member achieves material heating is not limited in the embodiments of the present application, and those skilled in the art can make routine settings.

[0117] In one or more embodiments of the present application, the graphitization furnace 1000 can further comprise an exhaust pump in addition to the furnace structure, and the furnace body 100 is provided with an exhaust passage communicating with the internal space thereof, and the exhaust pump is used to extract volatile gas in the furnace body 100 through the exhaust passage to reduce the risk of furnace explosion. Wherein, the exhaust pump is a routine processing means in the art, which will not be repeated here.

[0118] In one or more embodiments of the present application, the graphitization furnace 1000 can further comprise a temperature detection element and a pressure detection element in addition to the furnace structure, and the temperature detection element and the pressure detection element are respectively inserted into different first hole portions 15.

[0119] Specifically to an embodiment, as Figure 2As shown, the application provides a furnace cover 200. The furnace cover 200 comprises an inner ring 10, an outer ring 20 and a heat preservation assembly 30. The inner ring 10 has a first surface extending circumferentially along the inner ring 10, and the first surface is recessed to form a first matching part 11. The outer ring 20 has a second surface extending circumferentially along the outer ring 20, and the second surface is arranged on the side of the outer ring 20 close to the inner ring 10, and the second surface is provided with a second matching part 21. The outer ring body 22 is provided with an annular accommodating groove 221, and the annular accommodating groove 221 is provided with the heat preservation assembly 30. The heat preservation assembly 30 comprises a heat insulation layer 31 and a heat preservation sealing layer 32, and the heat insulation layer 31 comprises a refractory sub-layer 311, a heat insulation sub-layer 312 and a heat preservation sub-layer 313 arranged in sequence.

[0120] In the assembly of the furnace cover 200, the first matching part 11 of the inner ring 10 is overlapped with the second matching part 21 of the outer ring 20, so as to realize the connection of the inner ring 10 and the outer ring 20, thereby assembling a complete furnace cover 200, and simplifying the connection mode between the inner ring 10 and the outer ring 20.

[0121] In addition, the heat preservation assembly 30 can block the heat in the furnace body 100 from being directly transmitted to the furnace cover 200 and dissipated to the air through the furnace cover 200, so as to prevent the temperature of the surface of the furnace cover 200 from being too high and reduce the heat dissipation. As for the heat insulation layer 31 arranged as a plurality of sub-layers with different performances along the layer thickness direction, the heat insulation and heat preservation effect of the furnace cover 200 can be further improved.

[0122] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0123] The above-mentioned embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A furnace cover, characterized in that The furnace cover comprises: an inner ring having a first surface extending along a circumferential direction of the inner ring, the first surface being provided with a first matching part; an outer ring having a second surface extending along a circumferential direction of the outer ring, the second surface being provided on a side of the outer ring close to the inner ring, the second surface being provided with a second matching part, the second matching part being detachably connected with the first matching part.

2. The furnace cover of claim 1, wherein, The inner ring comprises an inner ring body, the inner ring body comprising the first surface, a part of the first surface being recessed along a radial direction of the inner ring body to form the first matching part. The outer ring comprises an outer ring body, the outer ring body comprising the second surface, the second matching part being protruded relative to the outer ring body, the second matching part bearing the first matching part.

3. The furnace cover of claim 2, wherein, The furnace cover further comprises a heat preservation assembly, the heat preservation assembly being detachably connected with the outer ring body.

4. The furnace cover of claim 3, wherein, The outer ring body is provided with an annular accommodating groove, the annular accommodating groove being provided with the heat preservation assembly.

5. The furnace cover of claim 4, wherein, The second matching part is detachably connected with the outer ring body along a radial direction of the outer ring body to block a part of the annular accommodating groove and limit the heat preservation assembly in the radial direction of the outer ring body.

6. The furnace cover of claim 4, wherein, The annular accommodating groove comprises an inner ring segment and an outer ring segment connected with each other, a groove bottom wall of the inner ring segment being inclined relative to a groove bottom wall of the outer ring segment and arranged in a direction away from the furnace body, wherein the furnace cover is covered on the furnace body.

7. The furnace cover of claim 6, wherein, The outer ring body comprises a high-temperature-resistant layer, the high-temperature-resistant layer being correspondingly arranged on a side of the inner ring segment facing the furnace body.

8. The furnace cover of claim 4, wherein, The annular accommodating groove is provided with a fixing member, the fixing member being connected with the heat preservation assembly.

9. The furnace cover of claim 6, wherein, The heat preservation assembly comprises a heat insulation layer and a heat preservation blocking layer, the heat insulation layer and the heat preservation blocking layer being stacked along a thickness direction of the outer ring body, and the heat insulation layer being arranged closer to the furnace body relative to the heat preservation blocking layer.

10. The furnace cover of claim 9, wherein, In a direction away from the furnace body, the heat insulation layer comprises a fire-resistant sublayer, a heat insulation sublayer and a heat preservation sublayer which are sequentially stacked.

11. The furnace cover according to any one of claims 1 to 10, characterized in that The furnace cover further comprises an insulating member, the insulating member being arranged on a side of the first surface and the outer ring radially away from the first surface.

12. The furnace cover according to any one of claims 1 to 10, characterized in that The inner ring is provided with a first gas injection hole, the first gas injection hole penetrating through the inner ring along an axial direction of the inner ring to inject a non-oxygen gas.

13. The furnace cover according to any one of claims 1 to 10, characterized in that The outer ring is provided with a second gas injection hole, the second gas injection hole penetrating through the outer ring along an axial direction of the outer ring to inject a non-oxygen gas.

14. A furnace structure, characterized by The furnace cover comprises: a furnace body having a furnace opening; and The furnace cover according to any one of claims 1 to 13, the furnace cover being covered on the furnace opening of the furnace body.

15. A graphitization furnace characterized by, The furnace structure according to claim 14.

Images