Roasting furnace
By adopting a composite sealing structure and insulation design in the calcining furnace, the problem of heat loss caused by a single sealing structure is solved, and higher thermal efficiency and temperature uniformity are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO FENGHUA TONGDA INNOVATION ALLOY TECH CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-04-17
AI Technical Summary
The existing roasting furnace has a simple sealing structure, which leads to serious heat loss and low thermal efficiency.
The composite sealing structure includes a metal plate and a ceramic fiber sleeve. The metal plate expands at high temperature, which drives the ceramic fiber sleeve to expand and compress. Combined with refractory mortar filling the gaps, it forms a multi-layer sealing effect. The heat preservation performance of the furnace body is improved by the square steel frame and the insulated furnace wall.
It effectively reduces heat loss from the joints between adjacent furnace bodies, improves the thermal efficiency and temperature uniformity inside the furnace body, and enhances the sealing effect.
Smart Images
Figure CN224136366U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of roasting equipment technology, and more specifically, to a roasting furnace. Background Technology
[0002] Roasting furnaces are suitable for the normalizing, annealing, and tempering processes of cast workpieces. Since these processes all require a certain roasting time, some manufacturers increase the length of the roasting furnace to improve production efficiency, thereby increasing the number of castings produced per roasting cycle. These roasting furnaces are often over 15 meters long and are therefore also called roasting tunnel kilns. For ease of transport, they are usually prefabricated in sections according to modular dimensions, i.e., divided into multiple furnace sections, and then assembled on-site. To ensure the airtightness of adjacent furnace sections after assembly, a sealing structure is installed at the joint. However, existing sealing structures between two furnace sections are mostly single-layer, single-ring seals, resulting in poor sealing performance and easy heat loss within the furnace, leading to low thermal efficiency. Utility Model Content
[0003] To address at least one of the aforementioned problems, this utility model provides a roasting furnace comprising multiple interconnected furnace bodies. Each furnace body has a connecting frame on one side and a connecting groove on the other side. The connecting frame is adapted to be inserted into the connecting groove of an adjacent furnace body. A composite sealing structure is provided on the connecting frame, comprising a metal plate and a ceramic fiber sleeve. The metal plate is installed on the outer peripheral wall of the connecting frame, and the ceramic fiber sleeve is fitted onto the connecting frame, with the metal plate located inside the ceramic limiting sleeve. The ceramic fiber sleeve is clearance-fitted with the connecting groove, and the outer peripheral wall of the ceramic fiber sleeve is coated with refractory mortar.
[0004] Optionally, both the mating frame and the metal plate are made of K412 high-temperature alloy.
[0005] Optionally, the furnace body includes a square steel frame and an insulated furnace wall, wherein the square steel frame is connected to the insulated furnace wall.
[0006] Optionally, the mating frame is welded and fixed to the square steel frame.
[0007] Optionally, the insulated furnace wall includes a heavy clay brick wall and a calcium silicate board, with the square steel frame located inside the heavy clay brick wall and the calcium silicate board located on the inner side of the heavy clay brick wall.
[0008] Optionally, the insulated furnace wall further includes an aluminum silicate fiber cotton layer, which is located between the heavy clay brick wall and the calcium silicate board.
[0009] Optionally, multiple metal plates are provided around the mating frame, and all of the multiple metal plates are connected to the mating frame by bolts.
[0010] Optionally, a metal frame is fixed to the end of the furnace body, and the metal frames between two adjacent furnace bodies are fixedly connected by bolts.
[0011] Optionally, two docking frames are provided at equal intervals, and each of the two docking frames is provided with a composite sealing structure. Two docking grooves are provided at equal intervals, and the two docking frames are respectively inserted into the two docking grooves.
[0012] Optionally, the top of the furnace body is provided with a corrugated top plate.
[0013] Compared with the prior art, the beneficial technical effects of this utility model are as follows:
[0014] 1. After the connecting frame is inserted into the connecting groove, it can form a partition and achieve a certain sealing effect. The ceramic fiber sleeve itself increases the sealing effect. When the metal plate is heated at high temperature, it expands and drives the ceramic fiber sleeve to expand and compress, forming a secondary sealing structure. This improves the sealing effect of the ceramic fiber sleeve at high temperature. In addition, the refractory mortar can fill the gap between the ceramic fiber sleeve and the connecting groove, forming a seal. The multiple sealing structures make it difficult for the heat inside the furnace to be lost from the joint between two adjacent furnace bodies.
[0015] 2. During assembly, the metal plate is not in a high-temperature environment and does not expand, allowing the ceramic fiber sleeve to fit with the mating groove, thus facilitating the docking of the two furnace bodies. The refractory mortar can fill the gap to form a seal. When the furnace body is working, the high temperature will cause the metal plate to expand, and the ceramic fiber sleeve itself has a certain elasticity, which will cause the ceramic fiber sleeve to expand, resulting in a better sealing effect.
[0016] 3. The square steel frame makes it easy to lift the furnace body during hoisting, transportation, or assembly. The insulated furnace wall, composed of heavy clay brick walls, calcium silicate boards, and aluminum silicate fiber cotton layers, has a good heat preservation effect, making it difficult for heat to be lost from the furnace body.
[0017] 4. The wavy top plate makes the top of the furnace body irregular. After the hot air rises from different locations, it is partially dispersed by the top plate and diffuses to the surroundings. This increases the residence time of the hot air inside the furnace body and improves the uniformity of the internal temperature to a certain extent, which is beneficial to improving the heat exchange efficiency. Attached Figure Description
[0018] Figure 1 The explosion of the furnace body and composite sealing structure in Embodiment 1 of this utility model Figure 1 ;
[0019] Figure 2 The explosion of the furnace body and composite sealing structure in Embodiment 1 of this utility model Figure 2 ;
[0020] Figure 3 This is a cross-sectional view of the furnace body and composite sealing structure in Embodiment 1 of this utility model.
[0021] Explanation of reference numerals in the attached drawings: 1. Furnace body; 11. Butt joint frame; 12. Butt joint groove; 13. Top plate; 14. Metal frame; 2. Composite sealing structure; 21. Metal plate; 22. Ceramic fiber sleeve. Detailed Implementation
[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-3 This application will be described in further detail.
[0023] This utility model provides a roasting furnace, as shown in Embodiment 1, refer to... Figure 1 and Figure 2 The roasting furnace includes a head furnace (not shown in the figure), a tail furnace (not shown in the figure), and multiple interconnected furnace bodies 1. The head furnace and tail furnace are located at both ends of the multiple interconnected furnace bodies 1 and are connected to the corresponding furnace bodies 1. The multiple furnace bodies 1 have the same structure; the following description uses the structure of one furnace body 1 as an example. The furnace body 1 has a furnace cavity to facilitate the placement and heating of workpieces. The furnace cavity extends through both sides of the furnace body 1 along the splicing direction, thus allowing the furnace cavities to communicate with each other after the multiple furnace bodies 1 are spliced. Each side of the furnace body 1 along its splicing direction has a connecting frame 11 and a connecting groove 12. The connecting frame 11 has a composite sealing structure 2. During splicing, the connecting frame 11, i.e., the composite sealing structure 2, on one furnace body 1 is inserted into the connecting groove 12 on the adjacent furnace body 1 to form a multiple seal, improving the sealing performance at the splicing point of two adjacent furnace bodies 1 and reducing heat loss from the furnace body 1.
[0024] The furnace body 1 includes a square steel frame (not shown in the figure) and an insulated furnace wall (not shown in the figure). The insulated furnace wall is installed on the square steel frame. During hoisting, transportation, or assembly, the hook on the crane can cooperate with the square steel frame to hoist the entire furnace body 1.
[0025] The insulated furnace wall comprises a heavy clay brick wall, calcium silicate boards, and an aluminosilicate fiber cotton layer. The heavy clay brick wall is stacked and fixed to a square steel frame, so that when the square steel frame is lifted, the heavy clay brick wall can be lifted completely and synchronously with the square steel frame. The exterior of the heavy clay brick wall is covered with sheet metal, which is fixed to the square steel frame with bolts, thus ensuring the aesthetic appearance of the furnace body 1. The calcium silicate boards are located inside the heavy clay brick wall (i.e., inside the furnace cavity) and are fixedly connected to the square steel frame. The aluminosilicate fiber cotton layer fills the space between the heavy clay brick wall and the calcium silicate board. The heavy clay brick wall, calcium silicate board, and aluminosilicate fiber cotton layer are all high-temperature resistant and have high thermal insulation performance, thus giving the entire furnace body 1 a good thermal insulation effect, preventing heat loss within the furnace body 1, and reducing heat generation power consumption.
[0026] Reference Figure 1 and Figure 2 In this embodiment, the mating frame 11 is preferably made of K412 high-temperature alloy, which is not easily oxidized in high-temperature environments and can expand under high temperatures, thereby driving the composite sealing structure 2 to expand and further improve the sealing effect. The mating frame 11 is welded to the square steel frame, which improves the stability of the connection between the mating frame 11 and the square steel frame. The mating groove 12 is formed on the square steel frame, so the square steel frame will also expand to a certain extent in high-temperature environments, thus making it more tightly pressed against the composite sealing structure 2 and improving the sealing effect.
[0027] Reference Figure 2 and Figure 3 The furnace cavity is topped with a high-temperature resistant material top plate 13, which is corrugated and fixedly connected to a calcium silicate board. The corrugated top plate 13 makes the top of the furnace body 1 irregular in shape. After the hot airflow rises from different locations, it is partially dispersed and diffused in all directions by the action of the top plate 13. This increases the residence time of the hot airflow inside the furnace body 1 and improves the uniformity of the temperature inside the furnace body 1 to a certain extent, which is beneficial to improving the heat exchange efficiency.
[0028] Reference Figure 1 and Figure 2 The composite sealing structure 2 includes a metal plate 21 and a ceramic fiber sleeve 22. The metal plate 21 is located outside the mating frame 11 and is installed on the outer peripheral wall of the mating frame 11. The ceramic fiber sleeve 22 is a U-shaped annular sleeve with its opening facing the mating frame 11. The ceramic fiber sleeve 22 is fitted onto the mating frame 11, and the metal plate 21 is located inside the ceramic limiting sleeve. The ceramic fiber sleeve 22 is also inserted into the mating groove 12. When the furnace body 1 is working, the high temperature will cause the metal plate 21 to expand, and the ceramic fiber sleeve 22 itself has a certain elasticity, which will cause the ceramic fiber sleeve 22 to expand and press against the groove wall of the mating groove 12, further improving the sealing effect.
[0029] Multiple metal plates 21 are provided, and each metal plate 21 is connected to the mating frame by bolts. Compared with a single ring-shaped metal plate 21, dividing the metal plate 21 into multiple parts facilitates processing, transportation, and assembly. Since the mating frame 11 needs to be inserted into the mating groove 12, countersunk holes for bolt insertion are provided on the mating frame 11 to ensure smooth insertion into the mating groove 12. The metal plates 21 are made of K412 high-temperature alloy.
[0030] Reference Figure 1 and Figure 2 During assembly, a small gap exists between the outer peripheral wall of the ceramic fiber sleeve 22 and the circumferential wall of the mating groove. This facilitates the smooth insertion of the mating frame 11 into the mating groove 12, improving the ease of splicing the two furnace bodies 1. When the furnace body 1 is in operation, the high temperature causes the metal plate 21, the mating frame 11, and the square steel frame to expand. The ceramic fiber sleeve 22 then presses against the bottom of the mating groove 12, eliminating gaps and improving the sealing effect. In addition, due to the irregularity of metal expansion at high temperatures, both the outer and inner peripheral walls of the ceramic fiber sleeve 22 are coated with refractory mortar. The refractory mortar fills the gaps, forming another layer of seal.
[0031] Metal frames 14 are installed at both openings of the furnace cavity. The metal frames 14 are welded to the square steel frame, and multiple bolt holes are spaced apart on the metal frames 14. The metal frames 14 between two adjacent furnace bodies 1 are fixedly connected by bolts inserted into the bolt holes and then engaged with nuts.
[0032] Since the maximum tempering temperature in the normalizing, annealing and tempering processes of cast workpieces is 650°, the materials of the aforementioned Chinese steel frame, bolts and metal frame 14 are all high-temperature resistant materials that can withstand temperatures above 800°.
[0033] The implementation principle of a roasting furnace according to an embodiment of this application is as follows: During assembly, the metal plate 21 is not in a high-temperature environment and does not expand, allowing the ceramic fiber sleeve 22 to fit with the mating groove 12 with a gap, thus facilitating the joining of the two furnace bodies 1. The mating frame 11, inserted into the mating groove 12, forms a partition, providing a certain sealing effect. The ceramic fiber sleeve 22 itself further enhances the sealing effect. The expansion of the metal plate 21 under high temperature causes the ceramic fiber sleeve 22 to expand and compress, forming a secondary sealing structure, thus improving the sealing effect of the ceramic fiber sleeve 22 at high temperatures. Because metal expands irregularly at high temperatures, both the outer and inner walls of the ceramic fiber sleeve 22 are coated with refractory mortar. This refractory mortar fills the gaps, forming another layer of sealing. These multiple seals prevent heat leakage from the joints inside the furnace body 1.
[0034] The insulated furnace wall provides good insulation for the furnace body 1, while the top plate 13 increases the residence time of hot air inside the furnace body 1 and improves the uniformity of temperature inside the furnace body 1 to a certain extent, which is beneficial to improving heat exchange efficiency.
[0035] Example 2 differs from Example 1 in that: two equally spaced mating frame edges 11 are provided, each with a composite sealing structure 2; two equally spaced mating grooves 12 are also provided, with the two mating frame edges 11 inserted into the two mating grooves 12 respectively. "Equally spaced" means that the larger frame encloses the smaller frame, and the width and length inside the larger frame are greater than the width and length outside the smaller frame. This adds multiple layers of sealing structure, further improving the sealing effect between the two furnace bodies 1.
[0036] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.
[0037] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0038] Furthermore, the terms "first," "second," etc., 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 with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0039] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0040] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0041] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.
[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0043] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.
Claims
1. A calciner, characterized by: The furnace includes multiple interconnected furnace bodies (1). One side of each furnace body (1) has a connecting frame (11), and the other side has a connecting groove (12). The connecting frame (11) is adapted to be inserted into the connecting groove (12) of an adjacent furnace body (1). The connecting frame (11) is provided with a composite sealing structure (2). The composite sealing structure (2) includes a metal plate (21) and a ceramic fiber sleeve (22). The metal plate (21) is installed on the outer peripheral wall of the connecting frame (11), and the ceramic fiber sleeve (22) is fitted on the connecting frame (11). The metal plate (21) is located inside the ceramic fiber sleeve. The ceramic fiber sleeve (22) is in clearance fit with the connecting groove (12). The outer peripheral wall of the ceramic fiber sleeve (22) is coated with refractory mortar.
2. The calciner according to claim 1, characterized in that: Both the docking frame (11) and the metal plate (21) are K412 high-temperature alloys.
3. The calciner according to claim 2, characterized in that: The furnace body (1) includes a square steel frame and an insulated furnace wall, wherein the square steel frame is connected to the insulated furnace wall.
4. The calciner of claim 3, wherein: The docking frame (11) is welded and fixed to the square steel frame.
5. The calciner of claim 3, wherein: The heat-insulating furnace wall includes a heavy clay brick wall and a calcium silicate board. The square steel frame is located inside the heavy clay brick wall, and the calcium silicate board is located on the inner side of the heavy clay brick wall.
6. The roasting furnace according to claim 5, characterized in that: The insulated furnace wall also includes an aluminum silicate fiber cotton layer, which is located between the heavy clay brick wall and the calcium silicate board.
7. The calciner of claim 1, wherein: Multiple metal plates (21) are arranged circumferentially on the mating frame (11), and the multiple metal plates (21) are all connected to the mating frame (11) by bolts.
8. The calciner of claim 1, wherein: A metal frame (14) is fixed to the end of the furnace body (1), and the metal frames (14) between two adjacent furnace bodies (1) are fixedly connected by bolts.
9. The calciner of claim 1, wherein: Two docking frames (11) are provided at equal intervals, and a composite sealing structure (2) is provided on each of the two docking frames (11). Two docking grooves (12) are provided at equal intervals, and the two docking frames (11) are respectively inserted into the two docking grooves (12).
10. The calciner of claim 1, wherein: The furnace body (1) has a wavy top plate (13) at the top inside.