Bottom expansion joint structure of muffle tank in furnace

Abstract

The utility model discloses an expansion joint structure at the bottom of a muffle tank in a furnace, and relates to the technical field of muffle tanks of heat treatment equipment. The bottom of the expansion joint is connected with a bottom supporting plate, and the upper part of the expansion joint is connected with a muffle tank; a tank body connecting plate is fixedly arranged on the outer edge of the lower end of the muffle tank, a plurality of fixing holes with the same hole diameter are correspondingly formed in plate bodies of the bottom supporting plate, the tank body connecting plate and the fixing plate, and the bottom supporting plate and the fixing plate as well as the tank body connecting plate and the fixing plate are fixedly connected through fastening bolts penetrating through the fixing holes; first sealing strips are arranged between the tank body connecting plate and the fixing plate and between the bottom supporting plate and the fixing plate in a clamped mode, and the upper end faces and the lower end faces of the first sealing strips abut against the tank body connecting plate and the fixing plate in a sealed mode respectively. According to the utility model, the expansion joint is connected to ensure the stability of the muffle tank when the muffle tank is heated and subjected to cold-hot expansion deformation, and ensure that heat in the furnace is not lost.

Description

Technical Field

[0001] This utility model relates to the field of muffle tank technology for heat treatment equipment, and in particular to a bottom expansion joint structure for an in-furnace muffle tank. Background Technology

[0002] An expansion joint is a flexible element that can effectively compensate for axial deformation. For example, expansion joints welded to the shell of a fixed tube sheet heat exchanger have high axial flexibility and are easy to deform. They can compensate for the thermal expansion difference between the tubes and the shell caused by the different wall temperatures, reduce their axial load, thereby reducing the thermal stress of the tubes, tube sheet and shell, and avoiding strength failure, instability failure and tube pull-out failure.

[0003] In the prior art, such as the utility model patent with application number 201420079261.2 and patent name "Structure of Expansion Joint of Muffle Tank in Nitriding Furnace", although it involves the structure of expansion joint of muffle tank, its solution content discloses the sealing connection relationship between muffle tank and furnace body, but does not involve the structural technical solution of expansion joint, and lacks research on the connection structure between muffle tank and expansion joint.

[0004] To solve the above problems, we designed an expansion joint structure at the bottom of the muffle furnace. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies in terms of the lack of research on the connection structure between the muffle tank and the expansion joint. This invention proposes a bottom expansion joint structure for the muffle tank inside the furnace, aiming to introduce the sealing connection technology between the muffle tank and the expansion joint. By connecting the expansion joint, the stability of the muffle tank during thermal expansion and contraction is ensured, and heat inside the furnace is not lost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An expansion joint structure for the bottom of a muffle tank inside a furnace is disclosed. The expansion joint has horizontally fixed plates at its upper and lower outer edges. A bottom support plate is connected to the bottom of the expansion joint, and the muffle tank is connected to its upper part. A tank body connecting plate is fixedly installed at the lower outer edge of the muffle tank. Several fixing holes of the same diameter are correspondingly opened on the bottom support plate, the tank body connecting plate, and the fixing plate. The bottom support plate and the fixing plate, as well as the tank body connecting plate and the fixing plate, are fixedly connected by fasteners passing through the fixing holes. A first sealing strip is sandwiched between the tank body connecting plate and the fixing plate, and between the bottom support plate and the fixing plate. The upper and lower ends of the first sealing strip respectively abut against the tank body connecting plate and the fixing plate.

[0008] More preferably, sealing baffles are fixedly provided on the upper end face of the fixing plate at the upper part of the expansion joint and the lower end face of the fixing plate at the lower part of the expansion joint. The curvature of the sealing baffles is the same as the curvature of the outer surface of the expansion joint, and the first sealing strip is sandwiched between the sealing baffles and the expansion joint.

[0009] More preferably, a second sealing strip is fixedly provided on the lower end face of the tank connecting plate and the upper end face of the bottom support plate, and the second sealing strip is in sealing contact with the first sealing strip.

[0010] A further preferred embodiment features a seamless sealing weld between the tank body connecting plate and the bottom support plate.

[0011] More preferably, the first sealing strip is asbestos packing.

[0012] More preferably, a fixing lug is provided above the expansion joint, and the fixing lug is fixedly installed on the outer surface of the muffle tank and fixedly connected to the furnace body.

[0013] More preferably, the bottom support plate is fixedly installed on the furnace body base.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model fixes the expansion joint to the muffle tank and the bottom support plate by setting fixing plates at both ends of the expansion joint and corresponding fixing holes on the muffle tank and the bottom support plate. A sealing strip is sandwiched between the connecting plates to seal the joint seam of the expansion joint. To prevent the sealing strip from moving and affecting the sealing performance, a baffle is also set on one side of the sealing strip to improve the sealing stability. To further enhance the sealing contact performance of the sealing strip, a protrusion that presses against the sealing strip is also provided on the plate. This utility model fully optimizes the structure of the expansion joint, improves the sealing connection performance between the expansion joint and the muffle tank, ensures the stability of the muffle tank during thermal expansion and contraction, and also ensures that heat is not lost from the furnace. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the connection and combination relationship between the muffle tank and the expansion joint in this embodiment;

[0016] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0017] Figure 3 for Figure 1 Enlarged schematic diagram of the structure at point B.

[0018] The following are the labels in the diagram: 1. Expansion joint; 2. Muffle tank; 3. Bottom support plate; 4. Tank body connecting plate; 5. Fixing plate; 6. Sealing baffle; 7. Second sealing strip; 8. Fastening bolt; 9. First sealing strip; 10. Fixing lug. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] like Figures 1-3 As shown in the figure, this embodiment introduces a bottom expansion joint structure for a muffle can inside a furnace. The bottom of the expansion joint 1 is connected to a bottom support plate 3, which is fixedly installed on the furnace body base. The upper part of the expansion joint 1 is connected to a muffle can 2. Fixed plates 5 are horizontally fixed to the outer edges of the upper and lower ends of the expansion joint 1. A tank connecting plate 4 is fixedly installed on the lower outer edge of the muffle can 2. Several fixing holes of the same diameter are correspondingly opened on the bottom support plate 3, the tank connecting plate 4, and the fixed plate 5. The bottom support plate 3 and the fixed plate 5 are fixedly connected by fastening bolts 8 passing through the fixing holes. The tank connecting plate 4 and the fixed plate 5 are also fixedly connected by fastening bolts 8 passing through the fixing holes. The fastening bolts 8 can be a combination of bolts and nuts for threaded fastening.

[0021] To ensure the sealing performance between the expansion joint 1 and the muffle tank 2, as well as the sealing performance at the bottom of the expansion joint 1, in this embodiment, a first sealing strip 9 is provided between the tank connecting plate 4 and the fixing plate 5, and between the bottom support plate 3 and the fixing plate 5. The upper and lower end faces of the first sealing strip 9 respectively seal against the tank connecting plate 4 and the fixing plate 5.

[0022] It should be noted that, in order to prevent the first sealing strip 9 from shifting under pressure and affecting the sealing performance, sealing baffles 6 are fixedly installed on the upper end face of the fixing plate 5 at the top of the expansion joint 1 and the lower end face of the fixing plate 5 at the bottom of the expansion joint 1. The sealing baffles 6 adopt a baffle structure with a curved arc, and the curvature of the sealing baffles 6 is the same as the curvature of the outer surface of the expansion joint 1. The first sealing strip 9 is sandwiched between the sealing baffles 6 and the expansion joint 1. Even if the first sealing strip 9 is squeezed from above and below, it will not move because it is blocked on both sides by the sealing baffles 6 and the expansion joint 1, thus ensuring the stability of the first sealing strip 9 when it performs its sealing function.

[0023] Further optimization is implemented to enhance the sealing contact performance between the tank connecting plate 4, the bottom support plate 3, and the first sealing strip 9. Protrusions are designed to be provided on both the tank connecting plate 4 and the bottom support plate 3, ensuring tight contact between these protrusions and the first sealing strip 9, thereby improving sealing. Therefore, in this embodiment, a second sealing strip 7 is fixedly provided on the lower end face of the tank connecting plate 4 and the upper end face of the bottom support plate 3, ensuring a sealing contact between the second sealing strip 7 and the first sealing strip 9.

[0024] Next, in order to further enhance the seal between the second sealing strip 7 and the first sealing strip 9, and to make the second sealing strip 7 embedded in the first sealing strip 9, the first sealing strip 9 in this embodiment adopts asbestos packing, and the second sealing strip 7 adopts a circular steel ring structure. The circular steel ring structure is seamlessly sealed and welded to the tank connecting plate 4 and the bottom support plate 3. On the one hand, the circular shape is conducive to sealing contact, and on the other hand, the circular steel ring structure ensures the strength of the structure, which is suitable for the harsh use scenarios of heating furnaces.

[0025] In order to ensure the stability of the expansion joint 1 and prevent the expansion joint 1 from shaking due to the shaking of the muffle tank 2, which would damage the sealing of the expansion joint 1 structure, a fixing lug 10 for fixing is provided above the expansion joint 1 in this embodiment. The fixing lug 10 is fixedly installed on the outer surface of the lower part of the muffle tank 2 and fixedly connected to the furnace body.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bottom expansion joint structure for an in-furnace muffle tank, characterized in that, The expansion joint (1) has a fixing plate (5) fixed horizontally at the outer edges of its upper and lower ends. The bottom of the expansion joint (1) is connected to the bottom support plate (3), and the upper part is connected to the muffle tank (2). The lower outer edge of the muffle tank (2) is fixedly provided with a tank body connecting plate (4). The bottom support plate (3), the tank body connecting plate (4) and the fixing plate (5) are all provided with a number of fixing holes of the same diameter. The bottom support plate (3) and the fixing plate (5) and the tank body connecting plate (4) and the fixing plate (5) are fixedly connected by fastening bolts (8) passing through the fixing holes. The tank body connecting plate (4) and the fixing plate (5) and the bottom support plate (3) and the fixing plate (5) are both sandwiched together with a first sealing strip (9). The upper and lower end faces of the first sealing strip (9) are respectively sealed and abutted against the tank body connecting plate (4) and the fixing plate (5).

2. The expansion joint structure at the bottom of the muffle furnace according to claim 1, characterized in that, A sealing baffle (6) is fixedly provided on the upper end face of the fixing plate (5) at the upper part of the expansion joint (1) and the lower end face of the fixing plate (5) at the lower part of the expansion joint (1). The curvature of the sealing baffle (6) is the same as the curvature of the outer surface of the expansion joint (1). The first sealing strip (9) is sandwiched between the sealing baffle (6) and the expansion joint (1).

3. The expansion joint structure at the bottom of the muffle tank in a furnace according to claim 1, characterized in that, The lower end face of the tank connecting plate (4) and the upper end face of the bottom support plate (3) are both fixedly provided with a second sealing strip (7), and the second sealing strip (7) is in sealing contact with the first sealing strip (9).

4. The expansion joint structure at the bottom of the muffle tank in a furnace according to claim 3, characterized in that, The second sealing strip (7) is a circular steel ring structure, and the circular steel ring structure is seamlessly sealed and welded to the tank connecting plate (4) and the bottom support plate (3).

5. The furnace muffle tank bottom expansion joint structure according to any one of claims 1-3, characterized in that, The first sealing strip (9) is asbestos packing.

6. The expansion joint structure at the bottom of the muffle tank in a furnace according to claim 1, characterized in that, A fixed hanging ear (10) is provided above the expansion joint (1). The fixed hanging ear (10) is fixedly installed on the outer surface of the muffle tank (2) and fixedly connected to the furnace body.

7. The expansion joint structure at the bottom of the muffle tank in a furnace according to claim 1, characterized in that, The bottom support plate (3) is fixedly installed on the furnace body base.

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