Furnace door and box-type heating furnace

Abstract

The furnace door comprises an outer wrapping layer and a heat preservation inner layer, the outer wrapping layer is provided with a heat preservation groove, the heat preservation inner layer is arranged in the heat preservation groove, and a part of the heat preservation inner layer extends out of the heat preservation groove so that the heat preservation inner layer can be inserted into a furnace opening of the box-type heating furnace. The heat preservation inner layer comprises an aluminum silicate ceramic fiber plate, aluminum silicate heat preservation cotton and a heat insulation aluminum plate, the aluminum silicate ceramic fiber plate has elasticity and good heat stability, the situation that the aluminum silicate ceramic fiber plate deforms due to temperature changes, thermal expansion and cold contraction or other reasons, and consequently the nearby structure is extruded and damaged is avoided, and meanwhile the requirement for manufacturing and assembling installation tolerance is lower; the aluminum silicate heat preservation cotton wrapping the periphery of the aluminum silicate ceramic fiber plate can be better attached to the furnace mouth, the gap between the heat preservation inner layer and the furnace mouth is reduced, and the heat insulation aluminum plate can block heat transmitted from the furnace mouth to the external space. Therefore, the closed furnace door and the furnace body can form a closed heat preservation space together, heat loss of the furnace door is effectively reduced, and the heat preservation performance of the furnace door is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of box-type heating furnace, and in particular to a furnace door and a box-type heating furnace. BACKGROUND

[0002] In the field of chemical industry, box-type heating furnaces are widely used in the thermal processing of instruments and materials, including but not limited to the heating and drying of chemical reactors, the evaporation of solvents, and the thermal treatment of various materials, etc. The heat preservation effect at the furnace door of the box-type heating furnace has a great influence on the temperature fluctuation in the furnace chamber. In the working state, the temperature in the furnace chamber of the box-type heating furnace is often as high as hundreds of degrees or even thousands of degrees, and therefore higher requirements are put forward for the heat preservation performance of the furnace door. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a furnace door and a box-type heating furnace, which can solve the problem of poor heat preservation performance of the furnace door in the box-type heating furnace.

[0004] In the first aspect, the embodiments of the present application provide a furnace door for a box-type heating furnace, which comprises an outer cladding layer and a heat preservation inner layer, and the outer cladding layer has a heat preservation groove; the heat preservation inner layer comprises an aluminum silicate ceramic fiber plate, aluminum silicate heat preservation cotton and a heat insulation aluminum plate; wherein, along the thickness direction of the heat preservation inner layer, the aluminum silicate ceramic fiber plate has oppositely arranged first and second surfaces, the heat insulation aluminum plate is arranged on the second surface, and the aluminum silicate heat preservation cotton is arranged on the peripheral wall surface of the aluminum silicate ceramic fiber plate; the heat preservation inner layer is embedded in the heat preservation groove through the first surface, and part of the heat preservation inner layer protrudes out of the heat preservation groove, so that the heat preservation inner layer can be inserted into the furnace mouth of the box-type heating furnace.

[0005] In some embodiments, along the thickness direction of the heat preservation inner layer, the thickness of the part of the heat preservation inner layer arranged in the heat preservation groove is d1, and the thickness of the part of the heat preservation inner layer protruding out of the heat preservation groove is d2, and the heat preservation inner layer satisfies at least one of the following conditions: (1) 40≤d1 / d2≤50; (2) 15mm≤d2≤20 mm.

[0006] In some embodiments, the peripheral wall surface of the aluminum silicate ceramic fiber plate comprises a first region and a second region, the first region is connected to the first surface, and the second region is connected to the second surface; the aluminum silicate heat preservation cotton is arranged at least in the second region; wherein, the aluminum silicate heat preservation cotton arranged at least in the second region comprises: the aluminum silicate heat preservation cotton is arranged in the first region and the second region; or, the aluminum silicate heat preservation cotton is arranged in the second region.

[0007] In some embodiments, in the direction perpendicular to the thickness direction of the heat preservation inner layer, the thickness of the aluminum silicate heat preservation cotton is A, and A satisfies: 10mm≤A≤20mm.

[0008] In some embodiments, the distance between the outer edge of the outer layer and the outer circumferential wall of the alumina silicate ceramic fiber plate is B, 12mm≤B≤25mm in the direction perpendicular to the thickness direction of the inner thermal insulation layer.

[0009] In some embodiments, the thermal insulation aluminum plate covers the second surface of the alumina silicate ceramic fiber plate entirely, and the outer surface of the thermal insulation aluminum plate is flush with the outer end surface of the alumina silicate thermal insulation cotton; the plane in which the outer end surface of the alumina silicate thermal insulation cotton is located is perpendicular to the thickness direction of the inner thermal insulation layer.

[0010] In some embodiments, the thickness end surface of the thermal insulation aluminum plate is flush with the outer circumferential wall of the alumina silicate ceramic fiber plate in the direction perpendicular to the thickness direction of the inner thermal insulation layer; or, the thermal insulation aluminum plate extends from the second surface to the outer circumferential wall connected to the alumina silicate ceramic fiber plate, and is clamped between the alumina silicate ceramic fiber plate and the alumina silicate thermal insulation cotton.

[0011] In some embodiments, the outer layer comprises a bottom plate and a plurality of side plates, the plurality of side plates being arranged around the periphery of the bottom plate and collectively enclosing the thermal insulation groove with the bottom plate; and the inner thermal insulation layer is detachably mounted to at least one of the bottom plate and the side plates.

[0012] In a second aspect, the embodiments of the present application provide a box-type heating furnace, which comprises a furnace body and a furnace door, the furnace body having a furnace opening; the furnace door is detachably mounted on the furnace body corresponding to the furnace opening, and the part of the inner thermal insulation layer extending out of the thermal insulation groove can be inserted into the furnace opening.

[0013] In some embodiments, the furnace body comprises a furnace shell, a furnace chamber arranged in the furnace shell, and a thermal insulation interlayer arranged between the furnace shell and the furnace chamber, and the thermal insulation interlayer encloses the furnace opening, and the material of the thermal insulation interlayer is the same as that of the alumina silicate ceramic fiber plate.

[0014] The furnace door and the box-type heating furnace based on the embodiment of the application, the heat preservation inner layer of the furnace door is selected to include the aluminum silicate ceramic fiber plate with elasticity, the aluminum silicate ceramic fiber plate has good thermal stability, will not be deformed due to temperature change, thermal expansion and cold shrinkage or other reasons to extrude and damage the structure near it, and the tolerance requirement for manufacturing and assembly and installation is also lower, in addition, it also has the advantages of light weight, good heat preservation and heat insulation performance, non-toxicity and the like. The aluminum silicate heat preservation cotton wrapped around the outer periphery of the aluminum silicate ceramic fiber plate can better fit the furnace port, reduce the gap between the heat preservation inner layer and the furnace port, the heat insulation performance of the heat insulation aluminum plate is good, and most of the heat radiation can be reflected, thereby blocking the heat transferred from the furnace port to the external space. In this way, the aluminum silicate ceramic fiber plate, the aluminum silicate heat preservation cotton and the heat insulation aluminum plate jointly act, so that the furnace door can form a closed heat preservation space with the furnace body when the furnace door is closed, effectively reducing the heat loss of the furnace door and improving the heat preservation performance of the furnace door. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0016] Figure 1 The structural schematic diagram of the box-type heating furnace of the embodiment of the application;

[0017] Figure 2 The structural schematic diagram of the outer cladding of the embodiment of the application;

[0018] Figure 3 The structural schematic diagram of the furnace door of the embodiment of the application;

[0019] Figure 4 The sectional structural schematic diagram of the furnace door of the embodiment of the application;

[0020] Figure 5 The sectional structural schematic diagram of the furnace door of the embodiment of the application;

[0021] Figure 6 The sectional structural schematic diagram of the furnace door of the embodiment of the application;

[0022] Figure 7 The sectional structural schematic diagram of the furnace door of the embodiment of the application;

[0023] Figure 8 The explosion structural schematic diagram of the box-type heating furnace of the embodiment of the application;

[0024] REFERENCE SIGNS:

[0025] 1. A box-type heating furnace;

[0026] 10. A furnace door; 11. An outer cladding; 11a. An insulation groove; 111. A bottom plate; 112. Side plates; 12. An insulation inner layer; 121. An aluminum silicate ceramic fiber plate; 1211. A first surface; 1212. A second surface; 121a. A first region; 121b. A second region; 122. An aluminum silicate insulation cotton; 123. An insulating aluminum plate;

[0027] 20. A furnace body; 20a. A furnace mouth; 21a. A shell mouth; 21. A furnace shell; 211. An upper shell body; 212. A lower shell body; 22. A furnace chamber; 221. A mounting hole; 23. An insulation sandwich layer; 231. An insulation plate; X. A thickness direction of the insulation inner layer. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0029] The inventor found that the furnace door of the box-type heating furnace uses an insulation layer and a metal shell for insulation, and its insulation performance is not good. The furnace door often faces the problems of poor assembly precision and material deformation, which can cause it difficult to maintain close fit between the furnace door and the furnace mouth, a gap is formed between the two, the heat in the furnace chamber is dissipated outward through the gap, and finally the energy efficiency and temperature stability of the box-type heating furnace are affected. With the increase of use time, the deformation or cracking problem of the insulation material is also difficult to avoid, which finally leads to poor or failed sealing effect. Based on this, the embodiments of the present application provide a furnace door and a box-type heating furnace.

[0030] Referring to Figure 1 , the box-type heating furnace 1 comprises a furnace door 10 and a furnace body 20, the furnace body 20 has a furnace mouth 20a, and the furnace door 10 is installed on the furnace body 20 in a closable manner corresponding to the furnace mouth 20a. After the furnace door 10 is closed on the furnace body 20, the furnace door 10 and the furnace body 20 jointly form a closed insulation space, and the insulation space is used to accommodate the articles to be heat treated.

[0031] Referring to Figures 2-3 , the furnace door 10 comprises an outer cladding 11 and an insulation inner layer 12. The outer cladding 11 has an insulation groove 11a, and the insulation groove 11a provides a containing space for the insulation inner layer 12. The outer cladding 11 comprises a bottom plate 111 and a plurality of side plates 112, the plurality of side plates 112 are arranged around the periphery of the bottom plate 111, and the plurality of side plates 112 and the bottom plate 111 jointly enclose the insulation groove 11a, the groove opening of the insulation groove 11a is formed on the side away from the bottom plate 111, and the insulation inner layer 12 is installed in the insulation groove 11a through the groove opening of the insulation groove 11a.

[0032] Optionally, the two adjacent side plates 112 are welded and fixed, and the bottom plate 111 is welded and fixed with the side plate 112, so that the outer cladding layer 11 has good structural strength, and the bottom plate 111 and the side plate 112 are integrally arranged to form a stable-shaped heat preservation groove 11a, facilitating the installation of the heat preservation inner layer 12.

[0033] Please refer to Figure 4 The heat preservation inner layer 12 includes a silicate ceramic fiber plate 121, a silicate heat preservation cotton 122, and a heat insulation aluminum plate 123. Along the thickness direction X of the heat preservation inner layer 12, the silicate ceramic fiber plate 121 has oppositely arranged first and second surfaces 1211 and 1212, the heat insulation aluminum plate 123 is attached to the second surface 1212, and the silicate heat preservation cotton 122 is arranged on the outer circumferential wall surface of the silicate ceramic fiber plate 121. Along the direction from the second surface 1212 to the first surface 1211, the heat preservation inner layer 12 is embedded in the heat preservation groove 11a through the first surface 1211, and part of the heat preservation inner layer 12 protrudes out of the heat preservation groove 11a, so that the heat preservation inner layer 12 can be inserted into the furnace opening 20a of the box-type heating furnace, and the heat preservation inner layer 12 is in interference fit with the wall surface of the furnace opening 20a after being inserted into the furnace opening 20a, so as to form a good sealing structure and play a good heat preservation effect.

[0034] In the embodiment of the present application, the silicate ceramic fiber plate 121 is made of silicate ceramic fiber, which is a light and non-toxic heat preservation material with low thermal conductivity and good heat insulation performance, and can effectively block the heat in the box-type heating furnace 1 from being transmitted outward. Compared with traditional heat preservation materials, the silicate ceramic fiber has good thermal stability and small thermal expansion, and is not easy to deform in a high-temperature working environment. In the use process of the furnace door 10, the silicate ceramic fiber plate 121 is not easy to deform due to temperature changes, thermal expansion and cold contraction, thereby reducing the risk of damage to the heat preservation inner layer 12.

[0035] Meanwhile, the silicate ceramic fiber has good elasticity, and during the process of inserting the heat preservation inner layer 12 into the furnace opening 20a, the circumferential direction of the silicate ceramic fiber plate 121 is extruded and elastically deformed. The elastic recovery trend makes the heat preservation inner layer 12 closely fit with the furnace opening 20a, effectively reducing the heat leakage. In this way, by using a heat preservation material with elasticity, the furnace door 10 can form a sealed heat preservation space together with the furnace body 20 after being closed, which not only reduces the heat loss of the furnace door 10 and saves electric energy, but also helps to maintain the stability of the temperature in the box-type heating furnace 1.

[0036] The heat preservation inner layer 12 of the embodiment of the present application is made of the aluminum silicate ceramic fiber plate 121. The aluminum silicate ceramic fiber plate 121 is elastic and has good thermal stability, and will not be deformed and squeezed to damage the structure near it due to temperature change, thermal expansion and cold shrinkage or other reasons. The aluminum silicate ceramic fiber plate 121 also has the advantages of light weight, good heat preservation and insulation performance, non-toxicity and the like. The aluminum silicate heat preservation cotton 122 wrapped around the outer periphery of the aluminum silicate ceramic fiber plate 121 can better fit the furnace opening, reduce the gap between the heat preservation inner layer 12 and the furnace opening 20a, and the heat insulation aluminum plate 123 has good heat insulation performance and can reflect most of the heat radiation, thereby blocking the heat transferred from the furnace opening 20a to the external space. In this way, the aluminum silicate ceramic fiber plate 121, the aluminum silicate heat preservation cotton 122 and the heat insulation aluminum plate 123 jointly act to enable the furnace door 10 to form a sealed heat preservation space together with the furnace body 20 when the furnace door 10 is closed, effectively reduce the heat loss of the furnace door 10, and improve the heat preservation performance of the furnace door 10.

[0037] In the embodiment of the present application, the aluminum silicate ceramic fiber plate 121 mainly plays a heat preservation and insulation effect. Please refer to Figures 4-5 In the direction perpendicular to the thickness direction X of the heat preservation inner layer 12, the distance from the outer edge of the outer package layer 11 to the outer peripheral wall surface of the aluminum silicate ceramic fiber plate 121 is B, and 12mm≤B≤25mm. In this range, the size of the aluminum silicate ceramic fiber plate 121 relative to the furnace door 10 is appropriate, preventing the thickness of at least one of the outer package layer 11 and the aluminum silicate heat preservation cotton 122 of the furnace door 10 from being too thick, which affects the heat preservation effect and sealing effect of the heat preservation inner layer 12. When B<12mm, the outer package layer 11 is too thin, and the outer package layer 11 is difficult to effectively protect the heat preservation inner layer 12, or the aluminum silicate heat preservation cotton 122 is too thin, and the aluminum silicate heat preservation cotton 122 is difficult to tightly fit the furnace opening 20a, and the sealing performance of the heat preservation inner layer 12 is reduced, and it is also not convenient to insert the heat preservation inner layer 12 into the furnace opening 20a. When B>25mm, at least one of the outer package layer 11 and the aluminum silicate heat preservation cotton 122 is too thick, and the size of the aluminum silicate ceramic fiber plate 121 relative to the furnace door 10 is too small, and the heat preservation effect of the aluminum silicate ceramic fiber plate 121 is not good. In addition, the excessive thickness of the aluminum silicate heat preservation cotton 122 also affects the elastic deformation of the aluminum silicate ceramic fiber plate 121, resulting in poor sealing performance of the heat preservation inner layer 12, and the excessive thickness of the outer package layer 11 also increases the mass of the furnace door 10, which is not convenient for installation and use.

[0038] In some embodiments, along the thickness direction X of the thermal insulation inner layer 12, the thickness of the part of the thermal insulation inner layer 12 placed in the thermal insulation groove 11a is d1, the thickness of the part of the thermal insulation inner layer 12 extending out of the thermal insulation groove 11a is d2, and 40≤d1 / d2≤50. Within this range, the depth of the thermal insulation inner layer 12 inserted into the furnace opening 20a is appropriate, the overlap of the thermal insulation inner layer 12 and the furnace body 20 is high, the thermal insulation inner layer 12 has good thermal insulation effect and structural stability, can effectively block the heat transfer at the insertion joint of the furnace door 10, and can ensure the connection stability between the thermal insulation inner layer 12 and the outer cladding 11. When d1 / d2>50, the thickness of the part of the thermal insulation inner layer 12 extending out of the thermal insulation groove 11a is too small, which can weaken the thermal insulation effect at the connection position of the thermal insulation inner layer 12 and the furnace body 20. When d1 / d2<40, the thickness of the part of the thermal insulation inner layer 12 placed in the thermal insulation groove 11a is too small, which can reduce the connection reliability between the thermal insulation inner layer 12 and the outer cladding 11, and can make it difficult to stably install the thermal insulation inner layer 12 on the outer cladding 11.

[0039] In some embodiments, 15 mm≤d2≤20 mm. Within this range, the size of the thermal insulation inner layer 12 extending out of the outer cladding 11 is appropriate, the depth of the thermal insulation inner layer 12 inserted into the furnace body 20 is appropriate, the position of the thermal insulation inner layer 12 inserted into the furnace body 20 has good thermal insulation effect, and the frictional resistance between the thermal insulation inner layer 12 and the furnace opening 20a is moderate, so that the thermal insulation inner layer 12 has good smoothness during the insertion process. When d2<15 mm, the part of the thermal insulation inner layer 12 extending out of the thermal insulation groove 11a is too thin, the depth of the thermal insulation inner layer 12 inserted into the furnace opening 20a is insufficient, and the thermal insulation effect is weakened, which can reduce the thermal insulation effect. When d2>20 mm, the part of the thermal insulation inner layer 12 extending out of the thermal insulation groove 11a is too thick, the frictional resistance increases when the thermal insulation inner layer 12 is inserted into the furnace opening 20a, which can not only increase the difficulty of closing the furnace door 10, but also can cause the thermal insulation inner layer 12 to fall off due to stress.

[0040] In some embodiments, the thermal insulation inner layer 12 is detachably connected to the outer cladding 11, so as to facilitate the maintenance and replacement of the outer cladding 11 or the thermal insulation inner layer 12. For example, the thermal insulation inner layer 12 is bonded or clamped to the outer cladding 11.

[0041] Alternatively, the thermal insulation inner layer 12 is detachably installed on at least one of the bottom plate 111 and the side plate 112. For example, the four corners of the aluminum silicate ceramic fiber plate 121 are installed on the bottom plate 111, or the aluminum silicate thermal insulation cotton 122 is bonded or clamped to the side plate 112, or the four corners of the aluminum silicate ceramic fiber plate 121 are bonded to the bottom plate 111 and the aluminum silicate thermal insulation cotton 122 is bonded to the side plate 112, so that the connection between the thermal insulation inner layer 12 and the outer cladding 11 is more stable.

[0042] In the embodiments of the present application, the aluminum silicate insulation cotton 122 is of flexible material, and has good conformability and adaptability. The aluminum silicate insulation cotton 122 is wrapped around the outer periphery of the aluminum silicate ceramic fiber plate 121, and can effectively fill the gap between the aluminum silicate ceramic fiber plate 121 and the furnace opening 20a, so that the heat preservation inner layer 12 can better conform to the furnace opening 20a. In this way, the aluminum silicate insulation cotton 122 can reduce the heat leakage from the gap to the external space of the box-type heating furnace 1, and help to improve the heat preservation effect of the heat preservation inner layer 12.

[0043] The aluminum silicate insulation cotton 122 brings greater flexibility to the processing and installation of the aluminum silicate ceramic fiber plate 121. For example, if factors such as processing errors cause the outer peripheral wall surface of the aluminum silicate ceramic fiber plate 121 or the furnace opening 20a to be uneven or have insufficient dimensional accuracy, the aluminum silicate insulation cotton 122 can adapt to the shape of the aluminum silicate ceramic fiber plate 121 and the furnace opening 20a through its own deformation, so as to form a close fit with the aluminum silicate ceramic fiber plate 121 and the furnace opening 20a. In this way, the heat preservation inner layer 12 better adapts to the furnace opening 20a, reducing heat loss.

[0044] In some embodiments, in the direction perpendicular to the thickness direction X of the heat preservation inner layer 12, the thickness of the aluminum silicate insulation cotton 122 is A, and A satisfies: 10mm≤A≤20mm. Within this range, the aluminum silicate insulation cotton 122 has good filling performance and does not hinder the elastic deformation of the aluminum silicate ceramic fiber plate 121, so as to ensure that the heat preservation inner layer 12 can form a close fit with the furnace opening 20a, and help to improve the heat preservation effect. When the thickness A<10mm, the aluminum silicate insulation cotton 122 is too thin, and it is difficult to adapt to the irregular shape and dimensional error of the outer peripheral wall surface of the aluminum silicate ceramic fiber plate 121. When the thickness A>20mm, the aluminum silicate insulation cotton 122 is too thick, and the aluminum silicate insulation cotton 122 will absorb and disperse the elastic deformation energy of the aluminum silicate ceramic fiber plate 121, so that the heat preservation inner layer 12 cannot maintain close fit with the furnace opening 20a under the action of elastic force.

[0045] In some embodiments, the outer circumferential wall surface of the aluminum silicate ceramic fiber plate 121 includes a first region 121a connected to the first surface 1211 and a second region 121b connected to the second surface 1212. It should be noted that the first region 121a is located on the outer circumferential wall surface of the part of the aluminum silicate ceramic fiber plate 121 placed in the heat preservation groove 11a, and the second region 121b is located on the outer circumferential wall surface of the part of the aluminum silicate ceramic fiber plate 121 extending out of the heat preservation groove 11a. Among them, the aluminum silicate heat preservation cotton 122 is at least provided in the second region 121b, that is, the outer circumferential wall surface of the aluminum silicate ceramic fiber plate 121 extending out of the heat preservation groove 11a is covered with aluminum silicate heat preservation cotton 122, so that the surface of the heat preservation inner layer 12 for plugging into the furnace opening 20a is provided with aluminum silicate heat preservation cotton 122, and the aluminum silicate heat preservation cotton 122 can be tightly fitted to the furnace opening 20a, reducing heat loss at the plugging connection.

[0046] In some embodiments, in combination with Figure 4 and Figure 5 , the aluminum silicate heat preservation cotton 122 is provided in the first region 121a and the second region 121b, and the aluminum silicate heat preservation cotton 122 is inserted into the furnace opening 20a synchronously with the heat preservation inner layer 12, adapts to the shape of the furnace opening 20a and is tightly fitted thereto, at this time, the aluminum silicate heat preservation cotton 122 partially extends into the heat preservation groove 11a, and the aluminum silicate heat preservation cotton 122 is connected to the side plate 112 and the bottom plate 111, improving the installation stability of the aluminum silicate heat preservation cotton 122. Alternatively, the aluminum silicate heat preservation cotton 122 forms a fully closed structure around the outer periphery of the aluminum silicate ceramic fiber plate 121, and the aluminum silicate heat preservation cotton 122 covers the outer circumferential wall surface of the aluminum silicate ceramic fiber plate 121 to play a more comprehensive sealing effect.

[0047] In some embodiments, referring to Figure 6 , the aluminum silicate heat preservation cotton 122 is provided in the second region 121b of the aluminum silicate ceramic fiber plate 121, and the aluminum silicate heat preservation cotton 122 does not extend into the heat preservation groove 11a, that is, the aluminum silicate heat preservation cotton 122 is not provided between the first region 121a of the aluminum silicate ceramic fiber plate 121 and the side plate 112. After the heat preservation inner layer 12 is plugged into the furnace opening 20a, the aluminum silicate heat preservation cotton 122 can be connected to the inner wall of the furnace opening 20a, thereby playing a role in filling the gap. At the same time, in the thickness direction X of the heat preservation inner layer 12, the aluminum silicate heat preservation cotton 122 can abut against the end wall surface of the side plate 112, and the side plate 112 provides support for the aluminum silicate heat preservation cotton 122, so that the aluminum silicate heat preservation cotton 122 can play a good sealing effect.

[0048] In this embodiment, the heat-insulating aluminum plate 123 is made of aluminum. The heat-insulating aluminum plate 123 not only has a low thermal conductivity and can reflect a large amount of heat radiation, exhibiting excellent heat insulation and thermal preservation performance, but it is also thin and lightweight, offering less resistance to the elastic deformation of the aluminosilicate ceramic fiber board 121. Furthermore, the heat-insulating aluminum plate 123 also provides sound insulation and noise reduction. After the furnace door 10 is closed at the furnace opening 20a of the furnace body 20, the heat-insulating aluminum plate 123 can reduce the heat transferred from the furnace chamber of the box-type heating furnace 1 to the outer cladding layer 11 and the external space, further enhancing the thermal insulation performance of the inner insulation layer 12 and preventing the outer cladding layer 11 from becoming too hot and causing burns to the operators.

[0049] In some embodiments, combined with Figures 4 to 6 In the thickness direction X of the inner insulation layer 12, the heat-insulating aluminum plate 123 completely covers the second surface 1212 of the aluminum silicate ceramic fiber board 121. The heat-insulating aluminum plate 123 forms a heat insulation barrier, effectively blocking the heat transferred from the furnace to the aluminum silicate ceramic fiber board 121. The outer surface of the heat-insulating aluminum plate 123 is flush with the outer end face of the aluminum silicate insulation cotton 122, wherein the plane containing the outer end face of the aluminum silicate insulation cotton 122 is perpendicular to the thickness direction of the inner insulation layer 12. The outer surface of the heat-insulating aluminum plate 123 is the surface of the heat-insulating aluminum plate 123 that faces away from the outer end face of the second surface 1212. That is, the distance S1 between the outer surface of the heat-insulating aluminum plate 123 and the outer end face of the aluminum silicate insulation cotton 122 satisfies -0.1mm≤S1≤0.1mm. In this way, the appearance of the inner insulation layer 12 is highly flat, avoiding the protrusion or exposure of the insulation material due to uneven stacking.

[0050] In some embodiments, in the direction perpendicular to the thickness direction X of the inner insulation layer 12, the thickness end face of the heat-insulating aluminum plate 123 is flush with the outer peripheral wall surface of the aluminosilicate ceramic fiber board 121, that is, the distance S2 between the thickness end face of the heat-insulating aluminum plate 123 and the outer peripheral wall surface of the aluminosilicate ceramic fiber board 121 satisfies -0.1mm ≤ S2 ≤ 0.1mm. For example, the heat-insulating aluminum plate 123 only covers the second surface 1212, and the heat-insulating aluminum plate 123 can form a heat insulation barrier. For another example, such as... Figure 7 As shown, the heat-insulating aluminum plate 123 covers the second surface 1212 and extends from the second surface 1212 to the outer peripheral wall of the aluminum silicate ceramic fiber board 121. The heat-insulating aluminum plate 123 is sandwiched between the aluminum silicate ceramic fiber board 121 and the aluminum silicate insulation cotton 122. In the direction perpendicular to the thickness direction X of the inner insulation layer 12, the aluminum silicate ceramic fiber board 121, the aluminum silicate insulation cotton 122 and the heat-insulating aluminum plate 123 form a multi-layer composite insulation structure, which helps to improve the insulation effect of the inner insulation layer 12.

[0051] Please refer to the following: Figure 1 This application also provides a box-type heating furnace 1, and in combination with Figure 8The box-type heating furnace 1 includes a furnace door 10 and a furnace body 20. The furnace body 20 includes a furnace shell 21, a furnace chamber 22, and an insulation jacket 23. The furnace shell 21 includes an upper shell 211 and a lower shell 212, which are connected to form an accommodating space. This accommodating space provides an installation base for the furnace chamber 22 and the insulation jacket 23. Optionally, the upper shell 211 and the lower shell 212 are detachably connected, for example, by fasteners (such as screws or bolts), facilitating the disassembly and maintenance of the furnace shell 21.

[0052] The furnace chamber 22 is a accommodating space within the furnace shell 21. The furnace chamber 22 includes a heating space and an opening connecting to the heating space. The heating space is used to place the material to be heated, and the opening is used to place or remove the material. The side wall of the furnace chamber 22 has multiple mounting holes 221, in which a resistance wire (not shown in the figure) is installed. In actual use, the resistance wire continuously generates heat and transfers it to the furnace chamber 22, causing the temperature of the furnace chamber 22 and the heating space to gradually rise, thereby heating the material to be heated within the furnace chamber 22. Optionally, the furnace chamber 22 is made of a high-temperature resistant material, such as silicon carbide high-alumina.

[0053] An insulation interlayer 23 is disposed between the furnace shell 21 and the furnace chamber 22, and the insulation interlayer 23 is used to block the heat transferred from the furnace chamber 22 to the furnace shell 21. In some embodiments, the insulation interlayer 23 includes multiple insulation boards 231, which are spliced ​​together and surround the outer periphery of the furnace chamber 22 to insulate the furnace chamber 22. The insulation boards 231 are provided with furnace openings 20a corresponding to the openings of the furnace chamber 22. After the furnace door 10 is closed in the furnace opening 20a, the inner insulation layer 12 and the insulation interlayer 23 are inserted and fitted together to form a sealed insulation space.

[0054] In some embodiments, the furnace shell 21 has a shell opening 21a corresponding to the furnace opening 20a, such as Figure 7 As shown, the lower shell 212 has a shell opening 21a, the size of which is larger than the size of the furnace opening 20a. The insulation interlayer 23 is partially exposed in the shell opening 21a, and a stepped structure is formed between the lower shell 212 and the insulation interlayer 23. In actual use, after the furnace door 10 is closed to the furnace body 20, the insulation inner layer 12 is inserted into the furnace opening 20a. The insulation inner layer 12 and the insulation interlayer 23 form a sealed insulation space. The outer layer 11 is inserted into the shell opening 21a and abuts against the insulation interlayer 23. The outer layer 11 and the furnace shell 21 together form a closed shell. The closed shell can provide additional insulation, further reduce heat loss, and improve the thermal efficiency of the box-type heating furnace 1.

[0055] In some embodiments, the thermal insulation layer 23 is made of the same material as the aluminum silicate ceramic fiber plate 121. On the one hand, the elasticity and ductility of the aluminum silicate ceramic fiber enable the thermal insulation layer 23 to be embedded between the furnace shell 21 and the hearth 22, and the assembly tolerance of the thermal insulation layer 23 is low. On the other hand, the aluminum silicate ceramic fiber has good thermal stability and small thermal expansion, and will not deform and squeeze the structures around it due to temperature changes, thermal expansion and contraction, or other reasons. In addition, the aluminum silicate ceramic fiber also has the advantages of light weight, good thermal insulation performance, non-toxicity, etc.

[0056] In the embodiments of the present application, the furnace door 10 is movably installed on the furnace body 20 corresponding to the furnace opening 20a. Optionally, the furnace door 10 is rotatably installed on the furnace shell 21, for example, the furnace door 10 and the furnace shell 21 are connected by a hinge, and the hinge connection structure can consider heat resistance and durability.

[0057] In the thermal insulation inner layer 12 of the furnace door 10, the elasticity of the aluminum silicate ceramic fiber plate 121 enables the thermal insulation inner layer 12 to be inserted into the furnace opening 20a and be in interference fit with the furnace opening 20a, effectively reducing heat leakage. The aluminum silicate insulation cotton 122 can conform to the shape of the furnace opening 20a, reducing the gap between the furnace door 10 and the furnace opening 20a, and the aluminum heat insulation plate 123 can reflect most of the heat radiation, thereby reducing the heat transferred from the hearth 22 to the external space. In this way, after the furnace door 10 is closed, it forms a closed thermal insulation space with the furnace body 20, which can effectively reduce the heat loss at the insertion connection between the furnace door 10 and the furnace opening 20a, and improve the thermal insulation performance of the furnace door 10.

[0058] Optionally, the box-type heating furnace 1 can also include other accessories, such as handles, support frames, power controllers, etc. The type of accessories is not particularly limited in the present application, which can be any accessory known in the related art.

[0059] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing 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, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0060] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A furnace door for a box furnace, characterized in that The outer cladding has a heat preservation groove; and The heat preservation inner layer comprises an aluminum silicate ceramic fiber plate, an aluminum silicate heat preservation cotton and a heat insulation aluminum plate; The aluminum silicate ceramic fiber plate has a first surface and a second surface arranged oppositely along the thickness direction of the heat preservation inner layer, the heat insulation aluminum plate is arranged on the second surface, and the aluminum silicate heat preservation cotton is arranged on the peripheral wall surface of the aluminum silicate ceramic fiber plate. The thickness of the part of the heat preservation inner layer arranged in the heat preservation groove along the thickness direction of the heat preservation inner layer is d1, the thickness of the part of the heat preservation inner layer extending out of the heat preservation groove is d2, and the heat preservation inner layer satisfies at least one of the following conditions:

2. The fire door of claim 1, wherein (1) 40≤d1 / d2≤50; (2) 15mm≤d2≤20 mm. The peripheral wall surface of the aluminum silicate ceramic fiber plate comprises a first region and a second region, the first region is connected to the first surface, and the second region is connected to the second surface; and the aluminum silicate heat preservation cotton is arranged at least in the second region.

3. The fire door of claim 1, wherein, The aluminum silicate heat preservation cotton is arranged at least in the second region, which comprises: The aluminum silicate heat preservation cotton is arranged in the first region and the second region; or The aluminum silicate heat preservation cotton is arranged in the second region. In the direction perpendicular to the thickness direction of the heat preservation inner layer, the thickness of the aluminum silicate heat preservation cotton is A, and A satisfies: 10mm≤A≤20mm.

4. The fire door of claim 1, wherein In the direction perpendicular to the thickness direction of the heat preservation inner layer, the distance from the outer edge of the outer cladding to the peripheral wall surface of the aluminum silicate ceramic fiber plate is B, and 12mm≤B≤25mm.

5. The fire door of claim 1, wherein The heat insulation aluminum plate entirely covers the second surface of the aluminum silicate ceramic fiber plate, and the outer surface of the heat insulation aluminum plate is flush with the outer end surface of the aluminum silicate heat preservation cotton.

6. The fire door of claim 1, wherein The plane where the outer end surface of the aluminum silicate heat preservation cotton is located is perpendicular to the thickness direction of the heat preservation inner layer.

7. The furnace door according to claim 6, wherein In the direction perpendicular to the thickness direction of the heat preservation inner layer, the thickness end surface of the heat insulation aluminum plate is flush with the peripheral wall surface of the aluminum silicate ceramic fiber plate; or The heat insulation aluminum plate extends from the second surface to the peripheral wall surface of the aluminum silicate ceramic fiber plate and is arranged between the aluminum silicate ceramic fiber plate and the aluminum silicate heat preservation cotton. The outer cladding comprises:

8. The fire door of claim 1, wherein A bottom plate; and A plurality of side plates, which are arranged around the periphery of the bottom plate and jointly form the heat preservation groove with the bottom plate; The heat preservation inner layer is detachably mounted on at least one of the bottom plate and the side plates. The furnace body has a furnace opening; and 9. A box furnace, characterized by The furnace door according to any one of claims 1-8 is detachably mounted on the furnace body corresponding to the furnace opening, and the part of the heat preservation inner layer extending out of the heat preservation groove can be inserted into the furnace opening. The furnace body comprises: A furnace shell; A furnace chamber arranged in the furnace shell; and 10. The box furnace of claim 9, wherein, A furnace door according to any one of claims 1-8 is detachably mounted on the furnace body corresponding to the furnace opening, and the part of the heat preservation inner layer extending out of the heat preservation groove can be inserted into the furnace opening. ​ ​ A heat-insulating interlayer is arranged between the furnace shell and the hearth, and the heat-insulating interlayer is enclosed to form the furnace mouth, and the material of the heat-insulating interlayer is the same as that of the aluminum silicate ceramic fiber plate.

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