Sealing structure for pyrolysis furnace

Abstract

The utility model belongs to pyrolysis furnace technical field, concretely relates to a sealing structure for pyrolysis furnace, and pyrolysis furnace includes furnace body and transmission shaft, and one end of furnace body is equipped with flange, and bearing seat is fixedly installed to flange, and transmission shaft is installed cooperation through bearing and bearing seat, and transmission shaft is used for transmission furnace body rotation, sealing structure includes labyrinth seal, packing seal and grease seal that distribute in turn along the gas direction, the utility model discloses sealing structure adopts three seals design, can effectively prevent the leakage of organic waste gas in furnace body from transmission shaft rotation part, and the sealing is reliable.

Description

Technical Field

[0001] This utility model belongs to the field of pyrolysis furnace technology, specifically relating to a sealing structure for a pyrolysis furnace. Background Technology

[0002] Currently, most pyrolysis furnaces use packing seals, which generally meet the requirements under slightly positive or negative pressure conditions. However, in some high-pressure applications, packing seals alone are insufficient. For example, under 10 bar pressure conditions, the seal at the pyrolysis furnace drive shaft is unreliable, easily leading to gas leakage. To meet the requirements, current methods include changing the packing material or increasing the number of packing rings to improve the sealing effect, but the results are not ideal and cannot fundamentally solve the sealing problem at the pyrolysis furnace drive shaft. Utility Model Content

[0003] Based on the aforementioned shortcomings of the existing technology, the purpose of this utility model is to provide a sealing structure for a pyrolysis furnace.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0005] A sealing structure for a pyrolysis furnace is disclosed. The pyrolysis furnace includes a furnace body and a drive shaft. A flange is provided at one end of the furnace body, and a bearing seat is fixedly installed on the flange. The drive shaft is installed and fitted with the bearing seat through a bearing. The drive shaft is used to drive the furnace body to rotate. The sealing structure includes a labyrinth seal, a packing seal, and a grease seal arranged sequentially along the gas outlet direction.

[0006] As a preferred embodiment, the bearing housing is provided with a sealing cover on one side of the furnace body, the sealing cover passing through the drive shaft and rotating synchronously with it; wherein, the sealing cover and the bearing housing form a labyrinth seal.

[0007] As a preferred embodiment, the sealing cover has an extended inner section along its axial direction, and an outer packing seal ring is provided between the outer diameter surface of the inner section and the first inner diameter surface of the opposite bearing seat to form a packing seal.

[0008] As a preferred embodiment, there are multiple outer packing rings, which are distributed sequentially along the axial direction of the sealing cover.

[0009] As a preferred embodiment, the inner diameter surface of the inner section of the sealing cover has a sealing groove, and an inner packing seal ring is provided between the sealing groove and the drive shaft.

[0010] As a preferred embodiment, the grease seal includes a piston structure consisting of an oil reservoir and a pressure plate. The inner diameter surface of the oil reservoir rotates synchronously with the drive shaft. The outer diameter surface of the oil reservoir has an oil injection groove. Two sealing rings with a spacing are provided between the outer diameter surface of the oil reservoir and the second inner diameter surface of the bearing seat opposite to it. The oil injection groove is located between the two sealing rings. The bearing seat has an oil injection channel, which communicates with the oil injection groove.

[0011] The oil reservoir has a piston chamber on the side facing the outer packing ring, a pressure plate is located in the piston chamber, and an oil injection groove communicates with the piston chamber; by injecting oil into the piston chamber, the pressure plate is driven to press against the outer packing ring.

[0012] As a preferred embodiment, the pressure plate is a hollow convex structure, with the protrusion used to press against the outer packing root seal ring.

[0013] As a preferred embodiment, the oil reservoir's oil filling groove is connected to the piston chamber via a through hole.

[0014] As a preferred embodiment, the bearing is mounted on the third inner diameter surface of the drive shaft and its opposite bearing housing, the diameter of the third inner diameter surface being larger than the diameter of the second inner diameter surface, and the diameter of the second inner diameter surface being larger than the diameter of the first inner diameter surface.

[0015] As a preferred embodiment, the bearing housing is fixed to the furnace body by bolts.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] (1) The sealing structure of this utility model adopts a three-seal design, which can effectively prevent the leakage of organic waste gas in the furnace body from the rotating part of the transmission shaft, and the sealing is reliable.

[0018] (2) The sealing cover and bearing seat of this utility model form a labyrinth seal, which can effectively adjust the gap between the transmission shaft that rotates synchronously with the sealing cover and the bearing seat, making the gap between the sealing cover and the bearing seat relatively uniform and making the sealing effect more reliable.

[0019] (3) The present invention designs a piston chamber in the oil reservoir, which is a sealed grease chamber, which not only has a sealing effect, but also can replenish the packing seal with grease.

[0020] (4) The pressure plate design of this utility model can improve the uniformity of the force on the packing seal ring and improve the reliability of the seal. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the sealing structure for the pyrolysis furnace according to Embodiment 1 of this utility model;

[0022] Figure 2This is an enlarged cross-sectional view of the sealing structure for the pyrolysis furnace in Embodiment 1 of this utility model;

[0023] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0024] Figure 4 This is a schematic diagram of the fit between the bearing housing and the sealing cover in Embodiment 1 of this utility model. Detailed Implementation

[0025] To more clearly illustrate the embodiments of this utility model, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0026] Example 1:

[0027] The pyrolysis furnace in this embodiment is used for the low-temperature pyrolysis of fly ash from waste incineration. Under nitrogen purging conditions, the fly ash is heated in an oxygen-deficient environment to thermally decompose the organic matter in the fly ash and achieve harmless treatment. To prevent the organic waste gas generated during pyrolysis from leaking from the rotating parts of the drive shaft, a reliable seal is essential.

[0028] like Figures 1 to 4 As shown, the pyrolysis furnace in this embodiment includes a furnace body 1 and a drive shaft 2. A flange 3 is fixed to the left end of the furnace body 1 by bolts. A bearing seat 4 is fixed to the middle opening of the flange 3 by bolts. The drive shaft 2 is installed and cooperates with the bearing seat 4 through a bearing 5. The drive shaft 2 is used to drive the furnace body 1 to rotate.

[0029] The sealing structure for the pyrolysis furnace in this embodiment includes a three-layer sealing structure consisting of a labyrinth seal I, a packing seal II, and a grease seal III arranged sequentially along the gas outlet direction. The three-layer sealing design can effectively prevent the leakage of organic waste gas from the rotating parts of the drive shaft inside the furnace, ensuring reliable sealing.

[0030] For the labyrinth seal I in this embodiment, its specific structure is as follows: the bearing seat 4 is located on one side inside the furnace body 1, that is, the right side of the bearing seat is provided with a sealing cover 6. The sealing cover 6 passes through the transmission shaft 2 and rotates synchronously. As an example, the sealing cover and the transmission shaft are fitted with an interference fit to achieve synchronous rotation. The left end face of the sealing cover 6 and the right end face of the bearing seat 4 form the first seal, that is, the labyrinth seal. The labyrinth seal structure is formed by the mutual cooperation of the sealing teeth in the prior art. For details, please refer to the prior art, which will not be elaborated here.

[0031] This embodiment uses a labyrinth seal as the first seal. The gap between the drive shaft and the bearing housing can be adjusted within a certain range and connected by a flange. When the drive shaft is subjected to force in one direction, the sealing cover can be deflected accordingly. Therefore, the gap between the drive shaft and the bearing housing can be effectively adjusted, making the gap between the sealing cover and the bearing housing relatively uniform and the sealing effect more reliable.

[0032] In this embodiment, the sealing cover 6 has an extended inner section 60 extending to the left along its axial direction. An outer packing seal ring 7 is provided between the outer diameter surface of the inner section 60 and the first inner diameter surface 4-1 of the bearing seat opposite it, thereby forming a second seal, namely a packing seal.

[0033] Among them, there are multiple outer packing rings 7, as an example. Figure 1 Five are shown in the figure, distributed sequentially along the axial direction of the sealing cover 6 (the same as the circumference of the drive shaft).

[0034] In addition, the inner diameter surface of the inner section 60 of the sealing cover has a sealing groove 600, and an inner packing seal ring 8 is provided between the sealing groove 600 and the drive shaft 2 to achieve further sealing between the sealing cover 6 and the drive shaft 2.

[0035] like Figure 3 As shown, the third seal in this embodiment, namely the grease seal, includes a piston-like structure consisting of an oil reservoir 9 and a pressure plate 10. The inner diameter surface of the oil reservoir 9 is synchronously rotated and engaged with the transmission shaft 2. The outer diameter surface of the oil reservoir 9 has an oil injection groove 90. Two sealing rings 11 with a spacing are provided between the outer diameter surface of the oil reservoir 9 and the second inner diameter surface 4-2 of the bearing seat opposite to it. The oil injection groove 90 is located between the two sealing rings. The bearing seat 4 has an oil injection channel 40, which is connected to the oil injection groove 90. That is, oil can be injected into the oil injection groove 90 through the oil injection channel 10.

[0036] In addition, in this embodiment, the oil reservoir 9 has a piston chamber 91 on the right side facing the outer packing ring 7, and a pressure plate 10 is disposed in the piston chamber 91. An oil injection groove 90 communicates with the piston chamber 91; specifically, the oil injection groove 90 and the piston chamber 91 are connected through a through hole. In this embodiment, oil is injected into the piston chamber 91 to drive the pressure plate 10 to press against the outer packing ring 7, preventing the sealing performance of the outer packing ring 7 from decreasing after wear. This embodiment designs a piston chamber in the oil reservoir, which is a sealed grease chamber, providing both a sealing effect and replenishing the packing ring with lubricating grease.

[0037] Among them, the pressure plate 10 is a hollow convex structure, which is embedded in the piston cavity 91. The protrusion of the pressure plate is used to press the outer packing seal 7, which can improve the uniformity of the force on the packing seal and improve the reliability of the seal.

[0038] like Figure 4As shown, in this embodiment, the bearing 5 is installed on the third inner diameter surface 4-3 of the transmission shaft 2 and its opposite bearing seat. The diameter of the third inner diameter surface 4-3 is larger than the diameter of the second inner diameter surface 4-2, and the diameter of the second inner diameter surface 4-2 is larger than the diameter of the first inner diameter surface 4-1, forming a stepped structure to improve assembly stability.

[0039] Example 2:

[0040] The difference between the sealing structure of the pyrolysis furnace in this embodiment and that in embodiment 1 is:

[0041] The design of the inner packing seal ring and sealing groove can be omitted, simplifying the structure and meeting the needs of different applications;

[0042] Other structures can be found in Example 1.

[0043] The above description is only a detailed explanation of the preferred embodiments and principles of this utility model. For those skilled in the art, there may be changes in the specific implementation methods based on the ideas provided by this utility model, and these changes should also be considered within the protection scope of this utility model.

Claims

1. A sealing structure for a pyrolysis furnace, the pyrolysis furnace comprising a furnace body and a drive shaft, a flange being provided at one end of the furnace body, a bearing seat being fixedly mounted on the flange, the drive shaft being mounted and fitted with the bearing seat via a bearing, the drive shaft being used to drive the rotation of the furnace body, characterized in that... The sealing structure includes a labyrinth seal, a packing seal, and a grease seal arranged sequentially along the outlet direction.

2. The sealing structure for a pyrolysis furnace according to claim 1, characterized in that, The bearing housing is provided with a sealing cover on one side of the furnace body. The sealing cover passes through the drive shaft and rotates synchronously with it; wherein, the sealing cover and the bearing housing form a labyrinth seal.

3. The sealing structure for a pyrolysis furnace according to claim 2, characterized in that, The sealing cover has an extended inner section along its axial direction, and an outer packing seal is provided between the outer diameter surface of the inner section and the first inner diameter surface of the bearing housing opposite it, forming a packing seal.

4. The sealing structure for a pyrolysis furnace according to claim 3, characterized in that, There are multiple outer packing rings, which are distributed sequentially along the axial direction of the sealing cover.

5. The sealing structure for a pyrolysis furnace according to claim 3, characterized in that, The inner diameter surface of the inner section of the sealing cover has a sealing groove, and an inner packing seal ring is provided between the sealing groove and the drive shaft.

6. The sealing structure for a pyrolysis furnace according to any one of claims 1-5, characterized in that, The grease seal includes a piston structure consisting of an oil reservoir and a pressure plate. The inner diameter surface of the oil reservoir rotates synchronously with the drive shaft. The outer diameter surface of the oil reservoir has an oil injection groove. Two sealing rings with a spacing are provided between the outer diameter surface of the oil reservoir and the second inner diameter surface of the bearing seat opposite it. The oil injection groove is located between the two sealing rings. The bearing seat has an oil injection channel, which is connected to the oil injection groove. The oil reservoir has a piston chamber on the side facing the outer packing ring, a pressure plate is located in the piston chamber, and an oil injection groove communicates with the piston chamber; by injecting oil into the piston chamber, the pressure plate is driven to press against the outer packing ring.

7. The sealing structure for a pyrolysis furnace according to claim 6, characterized in that, The pressure plate has a hollow convex structure, and the protrusion is used to press against the outer packing root seal ring.

8. The sealing structure for a pyrolysis furnace according to claim 6, characterized in that, The oil reservoir's oil filling groove is connected to the piston chamber via a through hole.

9. The sealing structure for a pyrolysis furnace according to claim 6, characterized in that, The bearing is mounted on the third inner diameter surface of the drive shaft and its opposite bearing housing. The diameter of the third inner diameter surface is larger than the diameter of the second inner diameter surface, and the diameter of the second inner diameter surface is larger than the diameter of the first inner diameter surface.

10. The sealing structure for a pyrolysis furnace according to any one of claims 1-5, characterized in that, The bearing housing is fixed to the furnace body by bolts.

Images