A sectional heat insulation structure of a furnace body of a heat treatment furnace

Abstract

The utility model provides a kind of heat treatment furnace body sectional type heat insulation structure, including furnace body and multiple heat insulation units, furnace body has cylindrical shell, multiple heat insulation units are sequentially arranged along the axial direction of furnace body, and are arranged around the shell inner wall of furnace body, each heat insulation unit includes inner layer refractory layer, middle layer heat insulation layer and outer layer protective layer, in two adjacent heat insulation units, the rear end of previous outer layer protective layer is equipped with annular splicing groove, the front end of subsequent outer layer protective layer is equipped with annular splicing boss, multiple fixing holes are all set on the outer wall of outer layer protective layer, threaded hole is set on the shell corresponding fixing hole, and fixed component is screw-connected between fixing hole and threaded hole.The utility model has the beneficial effects: through the structure that single heat insulation unit is independently detachable, reduce maintenance difficulty, three-layer composite structure and sealing design reduce heat leakage, evenly distribute stable furnace temperature, effectively improve heat treatment quality and equipment durability.

Description

Technical Field

[0001] This utility model mainly relates to the field of heat treatment furnace technology, specifically to a segmented heat insulation structure for a heat treatment furnace body. Background Technology

[0002] Heat treatment furnaces are key equipment in industrial production used for heat treatment processes such as heating, heat preservation, and cooling of workpieces. The heat insulation performance of the furnace body directly affects the heat treatment process effect, energy consumption, and equipment service life.

[0003] The existing heat treatment furnace body insulation structure is mostly an integral design, that is, the heat insulation layer is formed by laying refractory bricks, heat insulation cotton and other insulation materials on the inner wall of the furnace shell. However, the integral heat insulation structure has problems such as inconvenient maintenance, uneven insulation performance and poor adaptability. When the local heat insulation layer is damaged, the entire insulation layer must be removed for repair, which not only increases the workload of maintenance, but also causes the furnace to be shut down for a long time, affecting production efficiency. The integral structure is affected by the installation process, and local gaps or loose fit are prone to occur, resulting in uneven heat loss of the furnace body and affecting the heat treatment quality of the workpiece. Moreover, for furnace bodies of different lengths or different temperature ranges, different specifications of integral insulation layers need to be customized, which has low versatility.

[0004] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0005] 1. The technical problem to be solved by the utility model: This utility model provides a segmented heat insulation structure for a heat treatment furnace body to solve the technical problems existing in the background art.

[0006] 2. Technical Solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a segmented heat insulation structure for a heat treatment furnace body, comprising a furnace body and multiple heat insulation units. The furnace body has a cylindrical shell, and the multiple heat insulation units are arranged sequentially along the axial direction of the furnace body and surround the inner wall of the shell. Each heat insulation unit includes an inner refractory layer, a middle heat insulation layer, and an outer protective layer. The inner refractory layer, the middle heat insulation layer, and the outer protective layer are sequentially bonded from the inside to the outside and fixed together by a high-temperature adhesive. In two adjacent heat insulation units, the rear end of the outer protective layer of the preceding heat insulation unit is provided with an annular splicing groove, and the front end of the outer protective layer of the following heat insulation unit is provided with an annular splicing boss that matches the annular splicing groove. Multiple fixing holes are provided on the outer wall of the outer protective layer, and threaded holes are provided on the shell corresponding to the fixing holes. The fixing holes and the threaded holes are connected by a fixing component.

[0007] Furthermore, the inner refractory layer is a spliced ​​structure of refractory bricks, and the refractory bricks are fixed together by filling with high-temperature refractory mortar.

[0008] Furthermore, the middle insulation layer is a fiber felt laminated structure, with the fiber felts bonded together layer by layer using a high-temperature adhesive.

[0009] Furthermore, the outer protective layer is a metal sheet stamping structure, and its outer surface is provided with reinforcing ribs extending axially, and the fixing holes are distributed along the axial direction of the reinforcing ribs.

[0010] Furthermore, the cross-section of the annular splicing groove is trapezoidal, the cross-section of the annular splicing boss is adapted to the cross-section of the annular splicing groove, and a sealing element is embedded in the annular splicing groove, the sealing element being a ceramic fiber rope.

[0011] Furthermore, the fixing component includes a T-bolt and an asbestos insulation pad, the asbestos insulation pad being sleeved on the threaded part of the T-bolt and located between the head of the T-bolt and the outer protective layer.

[0012] Furthermore, the axial lengths of the multiple heat insulation units are consistent and they are evenly distributed along the axial direction of the furnace body. Both ends of the heat insulation units are provided with a high-temperature resistant sealing coating.

[0013] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this utility model has the following advantages: The structure of individual heat insulation units that can be independently disassembled reduces maintenance difficulty. Its three-layer composite structure and sealing design reduce heat leakage, evenly distribute and stabilize furnace temperature, and the outer layer protects internal components, extending the overall lifespan and effectively improving heat treatment quality and equipment durability.

[0014] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the thermal insulation unit structure of this utility model; Figure 4 This is a schematic diagram of the thermal insulation unit structure from another angle of this utility model.

[0016] Figure label: 1. Shell; 2. Inner fire-resistant layer; 3. Middle insulation layer; 4. Outer protective layer; 5. Annular splicing groove; 6. Annular splicing boss; 7. Fixing hole; 8. Threaded hole; 9. Fixing component; 10. Reinforcing rib. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See attached document Figure 1-4 A segmented heat insulation structure for a heat treatment furnace body includes a furnace body and multiple heat insulation units. The furnace body has a cylindrical shell 1. The multiple heat insulation units are arranged sequentially along the axial direction of the furnace body and surround the inner wall of the shell 1. Each heat insulation unit includes an inner refractory layer 2, a middle heat insulation layer 3, and an outer protective layer 4. The inner refractory layer 2, the middle heat insulation layer 3, and the outer protective layer 4 are sequentially bonded from the inside to the outside and fixed together by a high-temperature adhesive. In two adjacent heat insulation units, the rear end of the outer protective layer 4 of the preceding heat insulation unit is provided with an annular splicing groove 5, and the front end of the outer protective layer 4 of the following heat insulation unit is provided with an annular splicing boss 6 that matches the annular splicing groove 5. Multiple fixing holes 7 are provided on the outer wall of the outer protective layer 4. Threaded holes 8 are provided on the shell 1 corresponding to the fixing holes 7. The fixing holes 7 and the threaded holes 8 are connected by a fixing component 9.

[0022] The inner refractory layer 2 is a spliced ​​structure of refractory bricks. The refractory bricks are spliced ​​in a staggered manner, and the joints of adjacent rows of refractory bricks do not overlap. The gaps between the bricks are completely filled and compacted by high-temperature refractory mortar, which can form a continuous high-temperature barrier to directly withstand the thermal shock and erosion of the high-temperature environment in the furnace. This prevents the high temperature from directly acting on the middle insulation layer 3 and avoids the aging of the middle layer material due to overheating. The staggered splicing and refractory mortar filling can block the penetration of high-temperature gas in the furnace from the brick joints, further improving the sealing and refractory performance of the inner layer.

[0023] The middle insulation layer 3 is a fiber felt composite structure. Multiple layers of fiber felt are bonded together layer by layer with a high-temperature adhesive, and the laying directions of adjacent fiber felt layers are staggered, such as the upper layer being laid along the axial direction and the lower layer being laid along the circumferential direction. This composite connection method can extend the path of heat transfer from the furnace to the outside. Utilizing the low thermal conductivity of the fiber felt itself, the heat conduction and heat radiation effects are greatly reduced, and the transfer of heat from the furnace to the shell 1 is reduced. The layer-by-layer bonding structure can prevent the fiber felt from delaminating and falling off due to long-term high-temperature shrinkage, ensuring the long-term stability of the middle insulation function.

[0024] The outer protective layer 4 is a metal sheet stamping structure. Its outer surface is integrally stamped to form axially extending reinforcing ribs 10. The reinforcing ribs 10 not only enhance the deformation resistance of the metal sheet and prevent the outer layer from denting or warping due to thermal expansion and contraction during furnace heating, but also serve as the assembly reference for the fixing holes 7. Multiple fixing holes 7 are evenly distributed along the axial direction of the reinforcing ribs 10, so that when the fixing components 9 are connected through the fixing holes 7, the external force can be dispersed to the entire outer protective layer 4 through the reinforcing ribs 10, avoiding excessive local stress that could cause deformation of the outer layer. The outer protective layer 4 can also protect the inner refractory layer 2 and the middle insulation layer 3 from external impacts and dust erosion, extending the service life of the entire heat insulation unit.

[0025] Two adjacent thermal insulation units are tightly joined through a combination of splicing grooves, splicing bosses, and sealing components, ensuring no heat leakage at the axial splice: The rear end of the outer protective layer 4 of the previous thermal insulation unit is integrally stamped to form an annular splicing groove 5; the front end of the outer protective layer 4 of the subsequent thermal insulation unit is correspondingly stamped to form an annular splicing boss 6 that is perfectly matched with the annular splicing groove 5. During assembly, the annular splicing boss 6 must be fully inserted into the annular splicing groove 5, and the boss and the inner wall of the groove must fit tightly. Utilizing the structural characteristics of the trapezoidal cross section, it prevents adjacent units from misaligning radially, while increasing the contact area at the splicing point and reducing heat transfer through the splicing surface. Ceramic fiber rope is pre-embedded at the bottom of the annular splicing groove 5 as a sealing element. The ceramic fiber rope has the characteristics of high temperature resistance and good elasticity, which can fill the tiny gaps between the splicing groove and the splicing boss. It can also adapt to deformation when the furnace body expands and contracts with temperature, always maintaining the gap sealing state and completely preventing heat leakage from the splicing seam to the outside.

[0026] The thermal insulation unit and the housing 1 are connected in a detachable manner with good thermal insulation performance through the fixing component 9. The fixing holes 7 on the outer wall of the outer protective layer 4 correspond one-to-one with the threaded holes 8 on the shell 1. The T-bolts of the fixing components 9 need to pass through the asbestos insulation pad and the fixing holes 7 in sequence, and then be tightened into the threaded holes 8. The asbestos insulation pad is fitted onto the screw of the T-bolt and is tightly clamped between the head of the T-bolt and the outer protective layer 4. The asbestos insulation pad can buffer the pressure when the bolt is tightened, and prevent the bolt head from directly squeezing the outer protective layer 4, which would cause the metal sheet to deform. It also has heat insulation properties, which can block heat leakage at the fixing holes 7 and ensure that the heat insulation performance of the fixing part is consistent with the overall structure. The detachable threaded connection means that when a single heat insulation unit is damaged, it can be removed and replaced simply by unscrewing the fixing components 9 of the corresponding unit, without having to disassemble other units, which greatly reduces the difficulty of maintenance and downtime.

[0027] The axial lengths of multiple heat insulation units are consistent and they are evenly distributed along the axial direction of the furnace body, ensuring uniform heat insulation performance in each axial section of the furnace body. This avoids local heat accumulation or loss due to differences in unit length, ensuring a stable temperature field inside the furnace and improving the heat treatment quality of the workpiece. Both ends of each heat insulation unit are coated with a high-temperature resistant sealing coating, further enhancing the sealing at the joints of adjacent units. This also prevents high-temperature gases inside the furnace from directly corroding the material on the end faces of the units, delaying end face aging and extending the overall service life of the units.

[0028] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A segmented heat insulation structure for a heat treatment furnace body, characterized in that: The furnace body includes a furnace body and multiple heat insulation units. The furnace body has a cylindrical shell (1). The multiple heat insulation units are arranged sequentially along the axial direction of the furnace body and are arranged around the inner wall of the shell (1). Each heat insulation unit includes an inner refractory layer (2), a middle heat insulation layer (3), and an outer protective layer (4). The inner refractory layer (2), the middle heat insulation layer (3), and the outer protective layer (4) are sequentially bonded from the inside to the outside and are fixed together by a high-temperature adhesive. Adjacent units are... In the two heat insulation units, the outer protective layer (4) of the first heat insulation unit is provided with an annular splicing groove (5) at the rear end, and the outer protective layer (4) of the second heat insulation unit is provided with an annular splicing boss (6) that matches the annular splicing groove (5) at the front end. Multiple fixing holes (7) are provided on the outer wall of the outer protective layer (4), and threaded holes (8) are provided on the housing (1) corresponding to the fixing holes (7). The fixing holes (7) and the threaded holes (8) are connected by a fixing component (9) threaded together.

2. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The inner refractory layer (2) is a refractory brick splicing structure, and the refractory bricks are fixed by filling with high-temperature refractory mortar.

3. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The middle insulation layer (3) is a fiber felt composite structure, and the fiber felts are bonded together layer by layer by a high-temperature adhesive.

4. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The outer protective layer (4) is a metal sheet stamping structure, and its outer surface is provided with reinforcing ribs (10) extending along the axial direction. The fixing holes (7) are distributed along the axial direction of the reinforcing ribs (10).

5. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The cross-section of the annular splicing groove (5) is trapezoidal, and the cross-section of the annular splicing boss (6) is adapted to the cross-section of the annular splicing groove (5). A sealing element is embedded in the annular splicing groove (5), and the sealing element is a ceramic fiber rope.

6. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The fixing component (9) includes a T-bolt and an asbestos insulation pad, the asbestos insulation pad being fitted onto the screw of the T-bolt and located between the head of the T-bolt and the outer protective layer (4).

7. The segmented heat insulation structure for a heat treatment furnace body according to claim 1, characterized in that: The multiple heat insulation units have the same axial length and are evenly distributed along the axial direction of the furnace body. Both ends of the heat insulation units are provided with a high-temperature resistant sealing coating.

Images