Dual seal device

Abstract

The present disclosure provides a double sealing device, relating to the technical field of sealing of rotary furnace, which comprises a sealing shell, a first sealing mechanism installed at one end of the sealing shell, comprising a first graphite block, a connecting rope connected to one end of the first graphite block, a first counterweight connected to the other end of the connecting rope, and a pulley for converting the gravity of the first counterweight into the pulling force of the connecting rope on the first graphite block to tighten the first graphite block for sealing, and a second sealing mechanism installed at the other end of the sealing shell, comprising a second graphite block, a second counterweight, and a sliding block assembly connecting the second graphite block and the second counterweight for applying a pushing force to the second graphite block under the gravity of the second counterweight to compress the second graphite block for sealing. The double sealing device effectively increases the reliability of sealing.

Description

Technical Field

[0001] This disclosure relates to the field of sealing technology for rotary kilns, and more particularly to a double-sealing device. Background Technology

[0002] A rotary kiln, also known as a high-temperature rotating furnace, is a device used for thermochemical reactions. Simply put, it consists of a cylindrical kiln body, a kiln head hood, a kiln tail hood, support rollers, and a transmission device. The biomass pyrolysis rotary kiln is the core equipment in biomass pyrolysis, acting as a reactor to decompose biomass at high temperatures into products such as biochar, bio-oil, wood vinegar, and biogas. Because biomass pyrolysis requires an oxygen-free environment and is a high-temperature process, the sealing requirements for the equipment are very high. The biomass pyrolysis kiln needs to be connected in a closed loop to the downstream biochar, bio-oil, wood vinegar, and biogas separation systems, as well as to a closed-loop cooling device. Therefore, a high-temperature resistant dynamic and static connection sealing device is needed to ensure good airtightness and safety of the equipment during production, as well as product quality. Currently, the seals at both ends of biomass pyrolysis kilns use fish-scale type seals, which have poor wear resistance and airtightness, making them unsuitable for long-term use. Furthermore, severe air leakage at both ends leads to a large amount of air entering the pyrolysis kiln, causing biomass combustion inside the kiln, creating safety hazards, resulting in low product quality and uncontrollable processes. Summary of the Invention

[0003] In view of the above problems, this disclosure provides a double sealing device.

[0004] One aspect of this disclosure provides a double-sealing device, comprising: a sealing housing; a first sealing mechanism installed at one end of the sealing housing, comprising: a first graphite block; a connecting rope, one end of which is connected to the first graphite block; a first counterweight block connected to the other end of the connecting rope; a pulley for converting the weight of the first counterweight block into a pulling force of the connecting rope on the first graphite block, thereby tightening the first graphite block for sealing; and a second sealing mechanism installed at the other end of the sealing housing, comprising: a second graphite block; a second counterweight block; and a slider assembly connecting the second graphite block and the second counterweight block for applying a pushing force to the second graphite block under the weight of the second counterweight block, thereby pressing the second graphite block for sealing.

[0005] According to an embodiment of this disclosure, the first sealing mechanism further includes: a connecting ring, fixedly connected to the first graphite block; wherein a connecting rope passes through the connecting ring and connects to the first graphite block.

[0006] According to an embodiment of this disclosure, the first sealing mechanism further includes: a pressure plate, fixedly connected to the housing; and a fixing plate, fixedly connected to the inner side of the housing; wherein the pressure plate and the fixing plate form a sealing groove for placing the first graphite block.

[0007] According to embodiments of this disclosure, the first sealing mechanism further includes: a deep groove ball bearing; a first pulley shaft, which together with the deep groove ball bearing forms a pulley rotation pair; and a first bolt assembly for fixing the first pulley shaft to the sealing housing.

[0008] According to an embodiment of this disclosure, the sealing housing further includes a mounting groove for mounting a second graphite block.

[0009] According to an embodiment of this disclosure, the second sealing mechanism further includes a bearing housing, which is fixedly connected to the mounting groove.

[0010] According to embodiments of this disclosure, the slider assembly includes: a connecting rod; a second pulley shaft for hinged connection between the connecting rod and a second graphite block; a crank connecting rod for connecting the connecting rod and a second counterweight; a connecting pin for hinged connection between the crank connecting rod and the connecting rod; and a crank connecting shaft for connecting the crank connecting rod and a bearing housing.

[0011] According to an embodiment of this disclosure, the slider assembly further includes a second bolt assembly for fixing the second counterweight to the crank connecting rod.

[0012] According to embodiments of this disclosure, the second sealing mechanism includes two or more second graphite blocks, each second graphite block being tightly connected, and each second graphite block corresponding to a bearing seat.

[0013] According to embodiments of this disclosure, the double-sealing device further includes a connecting flange, fixedly connected to the second sealing mechanism, for connecting the double-sealing device to other equipment.

[0014] The at least one technical solution adopted in the embodiments of this disclosure has at least the following beneficial effects: This disclosure adopts a double-sealing method at both ends of the sealing shell, which can effectively increase the reliability of the seal and prevent the failure of a single seal from causing the overall failure of the sealing device; This disclosure uses graphite blocks and counterweights working together. When the contact part of the graphite block is worn, the graphite block can fill the wear gap under the gravity of the counterweight and maintain the seal continuously; This disclosure can adjust the weight of the counterweight according to the gas pressure inside the rotary kiln so that the graphite block seal achieves a state of good sealing and minimal wear; This disclosure uses graphite blocks for sealing. Graphite blocks are resistant to high temperatures and corrosion, and are suitable for sealing rotary kilns with high temperatures and corrosive environments. At the same time, graphite blocks have lubricating properties, which can reduce the wear between the sealing device and the rotating body and reduce production noise. Attached Figure Description

[0015] To gain a more complete understanding of this disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, wherein:

[0016] Figure 1 An isometric rotational sectional view of the overall structure of the dual-sealing device provided in an embodiment of this disclosure is schematically shown.

[0017] Figure 2 A schematic front view of the double sealing device provided in an embodiment of this disclosure is shown;

[0018] Figure 3 A schematic cross-sectional view along line AA is shown of the double sealing device provided in an embodiment of this disclosure;

[0019] Figure 4 An embodiment of this disclosure is illustrated schematically. Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0020] Figure 5 An embodiment of this disclosure is illustrated schematically. Figure 3 A magnified schematic diagram of the structure at point C in the middle;

[0021] Figure 6 A schematic rear view of the double-sealing device provided in an embodiment of this disclosure is shown.

[0022] [Explanation of Labels in the Attached Image]

[0023] 1. Pulley; 2. Pressure plate; 3. Connecting ring; 4. First graphite block; 5. First counterweight; 6. Connecting rope; 7. Pressure plate bolt; 8. Second counterweight; 9. Crank connecting rod; 10. Connecting rod; 11. Second graphite block; 12. Fixing plate; 13. Second graphite block connector; 14. Sealing housing; 15. Connecting flange; 16. Second pulley shaft; 17. Connecting pin; 18. Bearing housing; 19. Crank connecting shaft; 20. First bolt assembly; 21. Second bolt assembly; 22. First pulley shaft; 23. Deep groove ball bearing; 24. Bearing housing bolt assembly. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "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, an electrical connection, or a connection that allows communication between them; 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. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] In the description of this disclosure, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the subsystem 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 disclosure.

[0028] Throughout the accompanying drawings, identical elements are represented by the same or similar reference numerals. Conventional structures or constructions have been omitted where they may cause confusion in understanding this disclosure. Furthermore, the shapes, dimensions, and positional relationships of the components in the drawings do not reflect actual size, scale, or actual positional relationships. Additionally, any reference numerals placed between parentheses in the claims should not be construed as limiting the claims.

[0029] Similarly, to simplify this disclosure and aid in understanding one or more of the various aspects of the disclosure, in the above description of exemplary embodiments of the present disclosure, various features of the present disclosure are sometimes grouped together in a single embodiment, figure, or description thereof. The use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present disclosure. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] A rotary kiln, also known as a high-temperature rotating furnace, is a device used for thermochemical reactions. Simply put, it consists of a cylindrical kiln body, a kiln head hood, a kiln tail hood, support rollers, and a transmission device. The biomass pyrolysis rotary kiln is the core equipment in biomass pyrolysis, acting as a reactor to decompose biomass at high temperatures into products such as biochar, bio-oil, wood vinegar, and biogas. Because biomass pyrolysis requires an oxygen-free environment and is a high-temperature process, the sealing requirements for the equipment are very high. The biomass pyrolysis kiln needs to be connected in a closed loop to the downstream biochar, bio-oil, wood vinegar, and biogas separation systems, as well as to a closed-loop cooling device. Therefore, a high-temperature resistant dynamic and static connection sealing device is needed to ensure good airtightness and safety of the equipment during production, as well as product quality. Currently, the seals at both ends of biomass pyrolysis kilns use fish-scale type seals, which have poor wear resistance and airtightness, making them unsuitable for long-term use. Furthermore, severe air leakage at both ends leads to a large amount of air entering the pyrolysis kiln, causing biomass combustion inside the kiln, creating safety hazards, resulting in low product quality and uncontrollable processes.

[0032] To address the problem of poor sealing performance in existing sealing devices, this disclosure provides a dual-sealing device.

[0033] Figure 1 The diagram schematically illustrates an isometric rotational sectional view of the overall structure of the double-sealing device provided in an embodiment of this disclosure. (See diagram below.) Figure 1 As shown, this disclosure provides a double sealing device, including: a sealing housing 14; a first sealing mechanism installed at one end of the sealing housing 14, specifically including: a first graphite block 4; a connecting rope 6, one end of which is connected to the first graphite block 4; a first counterweight 5, connected to the other end of the connecting rope 6; a pulley 1, used to convert the weight of the first counterweight 5 into the tension of the connecting rope 6 on the first graphite block 4, tightening the first graphite block 4 for sealing; and a second sealing mechanism installed at the other end of the sealing housing 14, specifically including: a second graphite block 11; a second counterweight 8; and a slider assembly connecting the second graphite block 11 and the second counterweight 8, used to apply a pushing force to the second graphite block 11 under the action of the weight of the second counterweight 8, pressing the second graphite block for sealing.

[0034] In this embodiment, the first sealing mechanism further includes: a connecting ring 3, fixedly connected to the first graphite block 4. A connecting rope 6 passes through the connecting ring 3 and connects to the first graphite block 4. In this embodiment, the connecting rope 6 can be a steel wire rope. A pressure plate 2, fixedly connected to the housing. A fixing plate 12, fixedly connected to the inner side of the housing. The pressure plate 2 and the fixing plate 12 form a sealing groove for placing the first graphite block 4. Simultaneously, the side of the fixing plate 12 that does not contact the first graphite block 4 also includes several evenly distributed fixing blocks to further enhance the stability of the sealing groove.

[0035] Figure 2A schematic front view of the double-sealing device provided in an embodiment of this disclosure is shown. Figure 2 As shown, pulley 1 is fixed to pulley 1 fixing plate 12, which protrudes from pressure plate 2. Pressure plate 2 is fixedly connected to sealing housing 14 by pressure plate bolts 7. Several evenly distributed fixing blocks are also included on the outer side of the connection between pressure plate 2 and sealing housing 14 to further stabilize the connection. Pressure plate 2 can restrict the axial freedom of the first graphite block 4, further achieving sealing and improving sealing reliability. Simultaneously, pressure plate 2 is designed to be detachable, facilitating the replacement of the worn and failed first graphite block 4.

[0036] In this embodiment, the first sealing mechanism includes eight first graphite blocks 4, all of which are circumferentially stepped, of the same size, and evenly arranged in a sealing groove, which is U-shaped. The eight first graphite blocks 4 overlap end-to-end, leaving a certain gap in the non-sealing section. In other embodiments of this disclosure, different numbers or shapes of graphite blocks can be used depending on the actual application, as long as the sealing requirements are met; no limitation is made here.

[0037] This disclosure uses graphite blocks for sealing. Graphite blocks are high-temperature and corrosion-resistant, making them suitable for sealing rotary kilns in high-temperature and corrosive environments. Simultaneously, the graphite blocks possess lubricating properties, reducing wear between the sealing device and the rotating body, and lowering production noise. In some other embodiments of this disclosure, the shape of the graphite blocks, the wear tolerance thickness, and the required axial and radial directions for sealing can be freely selected according to sealing requirements, making them suitable for rotary kilns of different sizes.

[0038] Specifically, this embodiment includes at least two pulleys 1, which are symmetrically arranged on the sealing housing 14 to maintain the balance of the first sealing mechanism. Each pulley 1 corresponds to a pulley 1 fixing plate 12 and a first counterweight 5. A connecting rope 6 is wound around the pulley 1, and the weight of the first counterweight 5 is converted into a pulling force on the first graphite blocks 4 by the connecting rope 6. This causes the eight first graphite blocks 4, evenly distributed in the sealing groove, to move towards the circumferential center line under the action of the centripetal tension, achieving a seal. Simultaneously, when the first graphite blocks 4 are worn and gaps are created, the first graphite blocks 4 automatically rotate to fit tightly under the action of the centripetal tension, reducing the gaps at the overlap of the first graphite blocks 4 and causing them to converge, thus maintaining a continuous seal.

[0039] Figure 3 A schematic cross-sectional view along line AA of the double sealing device provided in an embodiment of this disclosure is shown. Figure 3As shown, the sealing housing 14 also includes a mounting groove for mounting the second graphite blocks 11. In this embodiment, the second sealing mechanism includes four second graphite blocks 11, all of which are stepped at the end faces, are of the same size, and are evenly placed in the sealing groove, which is U-shaped. The four second graphite blocks 11 are staggered and tightly overlapped without gaps, and are tightly connected to each other by second graphite block connectors 13. In some other embodiments of this disclosure, different numbers or shapes of graphite blocks can be used according to the actual application, as long as the sealing requirements are met, and no limitation is made here.

[0040] Figure 4 An embodiment of this disclosure is illustrated schematically. Figure 3 A magnified structural diagram of section B in the middle. (See diagram below.) Figure 4 As shown, pulley 1 forms a rotating pair with first pulley shaft 22 via deep groove ball bearing 23. First pulley shaft 22 is fixedly connected to sealing housing 14 via first bolt assembly 20. The use of deep groove ball bearing 23 in this disclosure reduces the frictional resistance of the rotating pair of pulley 1. When pulley 1 supports connecting rope 6 and converts the weight of first counterweight 5 into tension on first graphite block 4 by connecting rope 6, the resistance is small, ensuring the reliability of continuous sealing.

[0041] Figure 5 An embodiment of this disclosure is illustrated schematically. Figure 3 A magnified structural diagram of section C in the middle. (See diagram below.) Figure 5 As shown, the slider assembly includes: a connecting rod 10; a second pulley shaft 16 for hinged connection of the connecting rod 10 and the second graphite block 11; a crank connecting rod 9 for connecting the connecting rod 10 and the second counterweight 8; a connecting pin 17 for hinged connection of the crank connecting rod 9 and the connecting rod 10; a crank connecting shaft 19 for connecting the crank connecting rod 9 and the bearing seat 18; and a second bolt assembly 21 for fixing the second counterweight 8 to the crank connecting rod 9.

[0042] In this embodiment, when the end face of the second graphite block 11 is worn, the gravity of the second counterweight 8 is converted into the thrust of the slider assembly on the second graphite block 11. Under the guidance of the mounting groove, it continues to be in close contact with the rotary kiln body, so that the end face of the sealing shell 14 can maintain a continuous sealing effect.

[0043] Figure 6 A schematic rear view of the double-sealing device provided in an embodiment of this disclosure is shown. Figure 6As shown, the second sealing mechanism further includes a bearing housing 18, which is fixedly connected to the mounting groove. A threaded hole is provided on the sealing housing 14, and the bearing housing 18 is threadedly connected to the sealing housing 14 via a bearing housing bolt assembly 24. Simultaneously, the second sealing mechanism includes four second graphite blocks 11, which are tightly connected to each other, and each second graphite block 11 corresponds to one bearing housing 18.

[0044] In this embodiment, the double-sealing device further includes a connecting flange 15, which is fixedly connected to the second sealing mechanism and used to connect the double-sealing device to other equipment. Specifically, the connecting flange 15 is welded to the tail of the second sealing mechanism to connect the stationary equipment of the rotary kiln, thereby achieving a fully sealed tail.

[0045] In summary, this disclosure employs a double-sealing method at both ends of the sealing housing 14, which can effectively increase the reliability of the seal and prevent the failure of a single seal from causing the overall failure of the sealing device. This disclosure uses the combined action of graphite blocks and counterweights. When the contact part of the graphite block is worn, the graphite block can fill the wear gap under the gravity of the counterweight, thus maintaining the seal. This disclosure can adjust the weight of the counterweight according to the gas pressure inside the rotary kiln, so that the graphite block seal achieves a state of good sealing and minimal wear.

[0046] The specific embodiments described above provide a further detailed explanation of the technical solutions of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A double seal device, characterized by The application relates to a double-sealing device. The double-sealing device comprises a sealing shell (14), a first sealing mechanism installed at one end of the sealing shell (14), a first graphite block (4), a connecting rope (6) connected to one end of the first graphite block (4), a first counterweight block (5) connected to the other end of the connecting rope (6), a pulley (1) used for converting the gravity of the first counterweight block (5) into the pulling force of the connecting rope (6) on the first graphite block (4) to tighten the first graphite block (4) for sealing, a second sealing mechanism installed at the other end of the sealing shell (14), a second graphite block (11), a second counterweight block (8), a sliding block assembly connecting the second graphite block (11) and the second counterweight block (8) and used for applying the pushing force of the second counterweight block (8) to the second graphite block (11) to compress the second graphite block (11) for sealing, and the sealing shell (14) further comprises a placing groove used for placing the second graphite block (11). The second sealing mechanism further comprises a bearing seat (18) fixedly connected to the placing groove. The sliding block assembly comprises a connecting connecting rod (10), a second pulley shaft (16) used for hingedly connecting the connecting connecting rod (10) and the second graphite block (11), a crank connecting rod (9) used for connecting the connecting connecting rod (10) and the second counterweight block (8), a connecting pin shaft (17) used for hingedly connecting the crank connecting rod (9) and the connecting connecting rod (10), and a crank connecting shaft (19) used for connecting the crank connecting rod (9) and the bearing seat (18). The first sealing mechanism further comprises a connecting ring (3) fixedly connected to the first graphite block (4), wherein the connecting rope (6) is arranged through the connecting ring (3) and the first graphite block (4). The first sealing mechanism further comprises a pressing plate (2) fixedly connected to the shell and a fixed plate (12) fixedly connected to the inner side of the shell, wherein the pressing plate (2) and the fixed plate (12) form a sealing groove used for placing the first graphite block (4). The first sealing mechanism further comprises a deep groove ball bearing (23) and a first pulley shaft (22) which, together with the deep groove ball bearing (23), forms a rotating pair of the pulley (1), and a first bolt assembly (20) used for fixedly connecting the first pulley shaft (22) to the sealing shell (14). The sliding block assembly further comprises a second bolt assembly (21) used for fixedly connecting the second counterweight block (8) to the crank connecting rod (9). The second sealing mechanism comprises two or more second graphite blocks (11), each of which is tightly connected and corresponds to one bearing seat (18). The double-sealing device further comprises a coupling flange (15) fixedly connected to the second sealing mechanism and used for connecting the double-sealing device with other equipment. ​ ​ ​ 2. The dual seal device of claim 1, wherein, ​ ​ 3. The dual seal device of claim 1, wherein, ​ ​ ​ ​ 4. The dual seal device of claim 1, wherein, ​ ​ ​ ​ 5. The dual seal device of claim 1, wherein, ​ ​ 6. The dual seal device of claim 1, wherein, ​ 7. The dual seal device of claim 1, wherein, ​ ​

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