Furnace cover refractory seal structure

Abstract

The utility model relates to annealing furnace equipment technical field discloses the cover type annealing furnace heating cover refractory sealing structure, including cover body, the fixedly connected with sealing mechanism of cover body bottom wall, sealing mechanism includes fixed base, and the fixed base bottom wall is installed with sealing ring, and the fixed base top wall is opened with thread groove, and the thread groove is connected with screw rod in screwing, and the screw rod outer wall is connected with disc spring in sliding, and the screw rod top is connected with nut in screwing, and disc spring is located between fixed base and nut, and the cover body outer wall is installed with protection mechanism, and protection mechanism includes the protective door, and the protective door is connected in the cover body outer wall through the hinge rotation. The utility model discloses through the elastic deformation of disc spring after pressure and the pressure of fixed base is applied to compensate pressure loss, and the high temperature thermal expansion deformation amount is absorbed with wave spring washer to prevent the hinge from being stuck, to improve the sealing performance of heating cover bottom and the smoothness of protective door opening and closing significantly.

Description

Technical Field

[0001] This utility model relates to the technical field of annealing furnace equipment, and in particular to the refractory sealing structure of the heating hood of a bell-type annealing furnace. Background Technology

[0002] Bell-type annealing furnaces are important equipment widely used in the heat treatment process of metal materials. Bell-type annealing furnaces utilize heating bells fastened to the furnace base to construct a closed heating chamber. In order to ensure the stability of the protective atmosphere inside the furnace during the annealing process and prevent external air from entering and causing the workpiece to oxidize and become unusable, the sealing performance of the connection between the bottom of the heating bell and the mounting base is a key factor determining the quality of equipment operation.

[0003] However, existing bell-type annealing furnace heating bells have significant sealing defects in actual use. Because the heating bell needs to undergo frequent and intense high-temperature heating and cooling cycles during operation, the metal connecting parts at the bottom of the heating bell will undergo repeated dimensional changes due to thermal expansion and contraction. At the same time, conventional sealing gaskets or sealing fillers are prone to material creep and elastic relaxation under long-term continuous high temperature and mechanical pressure. Existing sealing methods that use ordinary bolts for rigid fixing or rely solely on self-weight compression lack an effective pressure compensation mechanism and cannot adapt to this thermal deformation and stress relaxation. As a result, the contact compression force at the sealing interface gradually decreases significantly over time, eventually forming a leakage gap at the bottom of the heating bell. This not only wastes protective gas but also causes oxidation and discoloration of annealed products due to sealing failure, seriously affecting production efficiency and product quality.

[0004] Therefore, this utility model proposes a refractory sealing structure for the heating hood of a bell-type annealing furnace to address the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems of insufficient sealing performance and low operational reliability of the heating cover of the bell-type annealing furnace under long-term high-temperature operation, which leads to sealing failure due to pressure loss and thermal deformation at the sealing interface and thus gas leakage, this utility model aims to provide a refractory sealing structure for the heating cover of the bell-type annealing furnace with improved structure that can effectively solve the above problems.

[0006] This utility model provides a refractory sealing structure for a heating hood of a bell-type annealing furnace, comprising: a hood body; and a sealing mechanism fixedly connected to the bottom wall of the hood body.

[0007] The sealing mechanism includes a disc spring assembly that can continuously apply a clamping force using elastic deformation to compensate for the sealing gap.

[0008] Furthermore, the sealing mechanism includes a fixed base fixedly connected to the bottom wall of the cover. A sealing ring for blocking gas leakage is installed at the lower end of the bottom wall of the fixed base. Multiple threaded grooves are equally spaced around the top wall of the fixed base. A screw is threadedly connected to the inner wall of the threaded groove. A disc spring with a high elastic modulus is slidably connected to the middle of the outer wall of the screw. A nut for adjusting the locking position is threadedly connected to the top of the screw. The disc spring is located between the fixed base and the nut. Tightening the nut causes the disc spring to be compressed and deformed, thereby applying a continuous clamping force to the fixed base.

[0009] Preferably, a protective mechanism for providing safety shielding is installed at the front end of the outer wall of the cover. The protective mechanism includes a protective door rotatably connected to the front end of the outer wall of the cover, and hinges are rotatably connected to the middle of the left and right sides of the outer wall of the protective door.

[0010] Preferably, a protective door is fixedly connected to one end of the hinge, and a cover is fixedly connected to the other end of the hinge. A wave spring washer is fixedly connected to the top wall of the hinge. The wave spring washer is used to provide axial elastic buffer space when the hinge expands due to heat.

[0011] Preferably, a wave spring washer is disposed between the hinge shaft and the hinge leaf. The wave spring washer is made of high-temperature resistant alloy material. The wave spring washer is used to provide elastic compensation clearance when the hinge expands due to heat to prevent the shaft and bushing from seizing.

[0012] Preferably, the outer wall of the cover is fixedly connected to the left and right sides for auxiliary connection, and the inner wall of the ear plate is threaded with a threaded post in the middle.

[0013] Preferably, the top of the threaded post is threaded to the ear plate, and the bottom of the threaded post passes through the ear plate and extends above the fixed seat.

[0014] Preferably, the threaded post connects the cover and the fixed seat, and the threaded post is used to fix the cover and the fixed seat for a secondary purpose to enhance the connection rigidity of the overall structure of the device.

[0015] Preferably, the sealing ring is embedded in the mounting groove opened in the bottom wall of the fixing seat, and the shape of the sealing ring is adapted to the reserved external mounting groove to ensure a tight fit of the sealing interface.

[0016] Preferably, the disc spring is sleeved on the outer periphery of the screw, and the disc spring is in a compressed state to apply a vertical clamping force to the fixed seat. The nut is used to lock the position of the disc spring and maintain the compressed deformation state of the disc spring.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model solves the problem of sealing failure and gas leakage caused by pressure loss at the sealing interface in the existing heating cover sealing structure under long-term high temperature operation or vibration environment by sliding a disc spring with high elastic modulus characteristics in the middle of the outer wall of the screw of the sealing mechanism. It achieves the effect of using the elastic deformation of the disc spring after being compressed to continuously apply a clamping force to the fixed seat to release elastic potential energy in real time to compensate for pressure loss, thereby significantly improving the sealing performance and operational reliability of the bottom of the cover.

[0019] 2. This utility model solves the problem in the prior art where the hinge of an annealing furnace protective door loses its fit clearance due to the thermal expansion difference between the shaft and the leaf blade under high-temperature conditions, thus causing mechanical jamming and preventing smooth opening and closing. This is achieved by using the small elastic gap formed between the shaft and the leaf blade by the wave spring washer to effectively absorb and compensate for the deformation caused by high-temperature thermal expansion, preventing the hinge from seizing and jamming. This ensures that the protective door can be opened and closed smoothly under all working conditions and improves the safety of equipment maintenance.

[0020] 3. This utility model solves the problem in the prior art that the main structure of the heating cover and the bottom sealing component are not sufficiently integrated and are prone to relative displacement under hoisting, transportation or thermal stress by setting ear plates on both sides of the outer wall of the cover and threading the cover to the fixed seat of the sealing mechanism. It achieves the effect of secondary fixing linkage between the cover and the fixed seat through the cooperation of ear plates and threaded columns, thereby enhancing the overall structural rigidity of the device and extending the service life of the equipment. Attached Figure Description

[0021] Figure 1 This is a front view of the refractory sealing structure of the heating hood of the bell-type annealing furnace proposed in this utility model;

[0022] Figure 2 This is a perspective view of the refractory sealing structure of the heating hood of the bell-type annealing furnace proposed in this utility model;

[0023] Figure 3 This is a structural exploded view of the refractory sealing structure of the heating hood of the bell-type annealing furnace proposed in this utility model;

[0024] Figure 4 for Figure 3 Enlarged view of point A;

[0025] Figure 5 This is a partial structural diagram of the refractory sealing structure of the heating hood of the bell-type annealing furnace proposed in this utility model;

[0026] Figure 6 This is a structural exploded view of the sealing mechanism of the refractory sealing structure of the heating hood of the annealing furnace proposed in this utility model;

[0027] Figure 7 This is a partial structural exploded view of the sealing mechanism of the refractory sealing structure of the heating hood of the bell-type annealing furnace proposed in this utility model.

[0028] Legend:

[0029] 1. Cover; 2. Sealing mechanism; 201. Fixing base; 202. Sealing ring; 203. Disc spring; 204. Screw; 205. Nut; 206. Threaded groove; 3. Protective mechanism; 301. Protective door; 302. Ear plate; 303. Threaded post; 304. Hinge; 305. Wave spring washer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0031] Example:

[0032] Please refer to Figures 1 to 7 This utility model provides a refractory sealing structure for the heating cover of a bell-type annealing furnace, which aims to solve the structural defects in the prior art where the sealing performance of the heating cover decreases due to insufficient pressure under high-temperature conditions and the connecting hinges of the safety door are prone to jamming due to thermal expansion differences, making opening and closing difficult.

[0033] Please refer to Figure 1 and Figure 2 The refractory sealing structure of the heating hood of the hood-type annealing furnace includes a hood body 1 and a sealing mechanism 2 fixedly connected to the bottom wall of the hood body 1. The hood body 1 serves as the main structure of the entire device to cover the internal space of the annealing furnace and withstand the high temperature environment. The sealing mechanism 2 is used to cooperate with the reserved installation groove to block the initial gap leakage and provide a continuous compression sealing force.

[0034] Please refer to Figure 3 , Figure 6 and Figure 7The sealing mechanism 2 includes a fixed base 201, which is fixedly connected to the bottom wall of the cover 1 and serves as the installation reference for subsequent components. A sealing ring 202 is installed at the lower end of the bottom wall of the fixed base 201. The sealing ring 202 is used to cooperate with the reserved installation groove to achieve precise sealing. Multiple threaded grooves 206 are equally spaced around the top wall of the fixed base 201. A screw 204 is threadedly connected to the inner wall of the threaded grooves 206. A disc spring 203 is slidably connected to the middle of the outer wall of the screw 204. The disc spring 203 is sleeved on the outer periphery of the screw 204 and located between the top surface of the fixed base 201 and the bottom surface of the nut 205. The top of the screw 204 is threadedly connected to the nut 205. By tightening the nut 205, the disc spring 203 undergoes elastic deformation, thereby continuously pressing against the fixed base 201. 01 Apply a clamping force. At the same time, a protective mechanism 3 is installed on the front end of the outer wall of the cover 1. The protective mechanism 3 includes a protective door 301, which is rotatably connected to the front end of the outer wall of the cover 1. Hinges 304 are rotatably connected to the middle of the left and right sides of the outer wall of the protective door 301. One end of the hinge 304 is fixedly connected to the protective door 301, and the other end of the hinge 304 is fixedly connected to the cover 1. A wave spring washer 305 is fixedly connected to the top wall of the hinge 304. The wave spring washer 305 is set between the pivot and the leaf of the hinge 304. This setting ensures that under high temperature conditions, the wave spring washer 305 can use its own elasticity to form a small gap to compensate for the thermal expansion difference between the pivot and the bushing of the hinge 304, thereby preventing the hinge 304 from jamming.

[0035] As a preferred embodiment, to improve the overall stability of the connection between the cover 1 and the base and to perform secondary reinforcement, please refer to... Figure 5 The outer wall of the cover 1 is fixedly connected to the left and right sides with ear plates 302. The inner wall of the ear plate 302 is threadedly connected to the middle of the threaded post 303. The top of the threaded post 303 is threadedly engaged with the ear plate 302. The bottom of the threaded post 303 passes through the ear plate 302 and extends to the top of the fixing seat 201. The threaded post 303 connects the cover 1 and the fixing seat 201, thereby achieving secondary fixation of the cover 1 and the fixing seat 201 through the engagement of the ear plate 302 and the threaded post 303.

[0036] As another preferred embodiment, in order to ensure that the elastic element can maintain stable physical properties under extreme high temperatures, the wave spring washer 305 is made of high-temperature resistant alloy material, which has excellent creep resistance and thermal fatigue resistance, ensuring that the wave spring washer 305 can effectively compensate for thermal expansion under all working conditions.

[0037] As another preferred embodiment, in order to ensure the initial seal fit, the sealing ring 202 is embedded in the mounting groove of the bottom wall of the fixing seat 201, and the shape of the sealing ring 202 is adapted to the shape of the reserved external mounting groove, so that a tight labyrinth-type or compression-type sealing interface can be formed during docking.

[0038] Working principle: When annealing is required, the cover 1 is aligned with the reserved mounting groove. The sealing ring 202 first contacts the mounting groove to form a preliminary seal. Then, by rotating the screw 204 and tightening the nut 205, the disc spring 203 sleeved on the screw 204 is compressed and undergoes elastic deformation. The disc spring 203 releases its elastic potential energy and continues to apply a pressing force to the fixed seat 201 downward.

[0039] When the pressure inside the furnace fluctuates or the sealing material creeps due to long-term heating, causing pressure loss, the elastic rebound of the disc spring 203 can compensate for the clamping force in real time and prevent leakage. When the protective door 301 needs to be opened for equipment maintenance, the wave spring washer 305 at the hinge 304 plays a role. If it is in a high temperature or residual heat environment, the wave spring washer 305 is deformed under pressure to absorb the dimensional changes of the hinge 304 shaft caused by thermal expansion, maintaining a reasonable movement gap between the shaft and the leaf, ensuring that the protective door 301 can be opened smoothly without the shaft jamming. At the same time, the cooperation between the ear plate 302 and the threaded post 303 further enhances the connection rigidity of the overall structure.

Claims

1. A refractory sealing structure for a bell-type annealing furnace heating bell, comprising a bell body (1). Its features are, A sealing mechanism (2) is fixedly connected to the bottom wall of the cover (1). The sealing mechanism (2) includes a fixed seat (201). The fixed seat (201) is fixedly connected to the bottom wall of the cover (1). A sealing ring (202) is installed at the lower end of the bottom wall of the fixed seat (201). Multiple threaded grooves (206) are equally spaced around the top wall of the fixed seat (201). A screw (204) is threadedly connected to the inner wall of the threaded groove (206). A disc spring (203) is slidably connected to the middle of the outer wall of the screw (204). A nut (205) is threadedly connected to the top of the screw (204). The disc spring (203) is located between the fixed seat (201) and the nut (205).

2. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 1, characterized in that, The outer wall front end of the cover (1) is equipped with a protective mechanism (3), the protective mechanism (3) includes a protective door (301), the protective door (301) is rotatably connected to the outer wall front end of the cover (1), and the left and right sides of the outer wall of the protective door (301) are rotatably connected with hinges (304).

3. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 2, characterized in that, One end of the hinge (304) is fixedly connected to the protective door (301), and the other end of the hinge (304) is fixedly connected to the cover (1).

4. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 2, characterized in that, A wave spring washer (305) is fixedly connected to the top wall of the hinge (304).

5. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 4, characterized in that, The wave spring washer (305) is disposed between the pivot and the leaf of the hinge (304), and the wave spring washer (305) is made of high temperature resistant alloy material.

6. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 1, characterized in that, The outer wall of the cover (1) is fixedly connected to the left and right sides with ear plates (302), and the inner wall of the ear plate (302) is threadedly connected to the middle of the threaded post (303).

7. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 6, characterized in that, The top end of the threaded post (303) is threaded into the ear plate (302), and the bottom end of the threaded post (303) passes through the ear plate (302) and extends above the fixing seat (201).

8. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 6, characterized in that, The threaded post (303) connects the cover (1) and the fixing seat (201).

9. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 1, characterized in that, The sealing ring (202) is embedded in the mounting groove on the bottom wall of the fixing seat (201), and the shape of the sealing ring (202) is adapted to the reserved external mounting groove.

10. The refractory sealing structure of the heating hood of the bell-type annealing furnace according to claim 1, characterized in that, The disc spring (203) is sleeved on the outer periphery of the screw (204), and the disc spring (203) is in a compressed state to apply a clamping force to the fixed seat (201).

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