Rotary sealing structure for combustion-supporting air pipeline of heat accumulating type ladle baking device

Abstract

The utility model provides a rotary sealing structure of a combustion-supporting air pipeline of a heat accumulating type ladle baking device. The rotary sealing structure is used for solving the problem that packing gradually loses efficacy under erosion of hot air. The sealing structure comprises a movable pipe and a static pipe, a sealing pipe is fixed to the outer side of the movable pipe, a plurality of sealing grooves are formed in the sealing pipe, metal gas rings with certain elasticity are clamped in the sealing grooves, notches are formed in the metal gas rings and arranged in a staggered mode, and the sealing pipe is rotationally connected with the inner side face of the static pipe in a sealed mode through the metal gas rings. A rotary connecting piece is arranged on the sealing pipe, and the rotary connecting piece is matched with the static pipe to limit the axial movement of the sealing pipe. Through the combination of the metal gas ring and the sealing groove, a tight sealing structure can be formed between the movable pipe and the static pipe, meanwhile, the end face sealing effect is further enhanced through the thrust of wind pressure in a pipeline to the metal gas ring, and the sealing reliability and durability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary pipeline sealing, in particular to a rotary sealing structure of a combustion-supporting air pipeline of a heat storage type ladle baking device. Background Art

[0002] The regenerative ladle baking machine is a new type of baking equipment developed based on regenerative combustion technology. It primarily consists of a combustion device, a regenerative chamber (containing a heat storage element), a reversing system, a fume exhaust system, and connecting pipes. Existing regenerative ladle baking machines typically use a packing seal for the combustion-supporting air duct. After prolonged use, the packing seal is eroded by the hot air (at a pressure of 4-6 kPa and a temperature of approximately 80-120°C), leading to leakage and failure. Utility Model Content

[0003] The utility model provides a rotary sealing structure for a combustion-supporting air duct of a heat storage type bun baking device, which solves the problem in the prior art that fillers gradually become ineffective under the erosion of hot air.

[0004] A rotary sealing structure for a combustion-supporting air duct of a heat storage type ladle baking device comprises a moving tube and a static tube. A sealing tube is fixed to the outer side of the moving tube. The sealing tube is provided with a plurality of sealing grooves. Metal air rings with a certain elasticity are clamped in the sealing grooves. The metal air rings are provided with notches, which are arranged in an interlaced manner. The sealing tube is sealingly and rotatably connected to the inner side surface of the static tube via the metal air rings. A rotating connector is provided on the sealing tube. The rotating connector cooperates with the static tube to limit the axial movement of the sealing tube.

[0005] Furthermore, the rotating connector includes a retaining ring fixed to the sealing tube, which is covered with a connecting sleeve. A limit plate is fixed to the end of the connecting sleeve closest to the moving tube. The retaining ring abuts against the limit plate via a flat bearing. The end of the connecting sleeve, away from the limit plate, is threadedly connected to the stationary tube via an internal thread. The flat bearing reduces direct friction between the moving tube, the connecting sleeve, and the stationary tube during rotation, thereby reducing wear and extending the service life of the entire device.

[0006] Furthermore, a rotating ring is fixed to the outer wall of the static tube, a sliding groove is provided on the side of the rotating ring close to the dynamic tube, and a limiting hole is provided on the side wall of the rotating ring that communicates with the sliding groove. An annular connecting plate is fixed to the sealing tube, and a limiting cylinder is fixed on the side of the connecting plate close to the rotating ring. The end of the limiting cylinder away from the connecting plate is placed in the sliding groove. The outer wall of the limiting cylinder is provided with an annular limiting groove, which corresponds to the limiting hole. A pin is inserted into the limiting hole, and the end of the pin can be placed in the limiting groove. The cooperation between the pin and the limiting groove effectively limits the axial movement of the sealing tube, ensuring that sealing elements such as the metal gas ring function in the correct position, thereby enhancing the axial stability of the entire sealing device.

[0007] Furthermore, the sealing tube has an annular sliding groove at the end closest to the static tube, within which a retaining ring slides. The retaining ring has an annular packing groove at the end closest to the center of the sealing tube, which is filled with packing that abuts against the sidewalls of the sliding groove. By enhancing the sealing effect and increasing the service life of the metal gas ring, this design helps reduce system downtime caused by seal failure and improves the overall stability and reliability of the piping system.

[0008] Furthermore, the matching tolerance between the sealing tube and the static tube is between 0.025-0.045 mm. This high-precision matching helps ensure the stability and reliability of the sealing device during operation and reduces leakage or wear caused by improper matching.

[0009] Furthermore, a support ring is fixed in the static tube. By fixing the support ring in the static tube, the structural strength of the static tube can be significantly enhanced to prevent it from being deformed when subjected to external forces (such as pressure, temperature changes, etc.).

[0010] Furthermore, the gaps of adjacent metal air rings are staggered by an angle of 180 degrees. The staggered gaps of adjacent metal air rings by 180 degrees can enhance the sealing effect and improve the sealing stability.

[0011] Furthermore, the movable pipe and the sealing pipe are connected via pipe threads, which have the characteristics of good sealing and easy maintenance.

[0012] The beneficial effects of this technical solution are:

[0013] This new design, through the coordination of the metal air ring and the sealing groove, creates a tight seal between the moving and stationary pipes. The thrust of the air pressure within the pipe on the metal air ring further enhances the end-face seal, improving the reliability and durability of the seal. The metal air ring and its staggered notches facilitate quick and easy maintenance or replacement. The metal air ring's elastic properties allow it to adapt to minor gap variations between the moving and stationary pipes caused by temperature changes, pressure fluctuations, or slight vibrations, helping to maintain a stable seal and ensure the proper operation of the piping system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the explosion structure of Example 1 of the present utility model;

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0017] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0018] Figure 4 This is a schematic diagram of the planar structure of the first embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of the planar structure of the second embodiment of the present utility model;

[0020] Figure 6 Schematic diagram of the explosion structure of the sealing tube in Example 2.

[0021] Among them: 1. moving pipe, 2. static pipe, 3. sealing pipe, 4. sealing groove, 5. metal gas ring, 6. notch, 7. fixing ring, 8. connecting sleeve, 9. plane bearing, 10. rotating ring, 11. slide groove, 12. limiting hole, 13. connecting plate, 14. limiting cylinder, 15. limiting groove, 16. pin, 17. sliding groove, 18. retaining ring, 19. packing groove, 20. support ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1, as Figure 1-4 As shown, the utility model provides a rotary sealing structure of the combustion-supporting air duct of a heat storage type ladle baking device, comprising a moving tube 1 and a static tube 2. A sealing tube 3 is fixed to the outside of the moving tube 1. The sealing tube 3 is provided with a plurality of sealing grooves 4. Metal air rings 5 ​​with a certain elasticity are clamped in the sealing grooves 4. The metal air rings 5 ​​are provided with notches 6, and the notches 6 are staggered with each other. The sealing tube 3 is sealingly and rotatably connected to the inner side surface of the static tube 2 through the metal air rings 5. A rotating connector is provided on the sealing tube 3. The rotating connector cooperates with the static tube 2 to limit the axial movement of the sealing tube 3.

[0024] During installation, the sealing tube 3 is secured to the end of the moving tube 1. The metal ring 5 is snapped into place within the sealing groove 4 through the notches 6 of the metal ring 5. The sealing tube 3 is then inserted into the static tube 2. The elasticity of the metal ring 5 forces the outer wall of the ring 5 against the inner wall of the static tube 2, forming a seal. Simultaneously, the wind pressure entering the pipe applies thrust to the ring 5, forcing its sidewalls against the sidewalls of the sealing groove 4, forming an end-face seal and further enhancing the reliability and durability of the seal. The rotating connector then engages the static tube 2 to limit axial movement of the sealing tube 3, preventing seal failure caused by axial movement. The staggered notches 6 on the metal ring 5 make maintenance or replacement of the ring 5 quick and easy, reducing maintenance costs and time. The elastic properties of the ring 5 allow it to adapt to even minor gap variations between the moving and static tubes 1 and 2 caused by temperature changes, pressure fluctuations, or minor vibrations, thereby maintaining a stable seal.

[0025] like Figure 1-4 As shown, a rotating ring 10 is fixed to the outer wall of the static tube 2, and a slide groove 11 is provided on the side of the rotating ring 10 close to the dynamic tube 1, and a limiting hole 12 connected to the slide groove 11 is provided on the side wall of the rotating ring 10. An annular connecting plate 13 is fixed on the sealing tube 3, and a limiting cylinder 14 is fixed on the side of the connecting plate 13 close to the rotating ring 10. The end of the limiting cylinder 14 away from the connecting plate 13 is placed in the slide groove 11, and the outer wall of the limiting cylinder 14 is provided with an annular limiting groove 15, which corresponds to the limiting hole 12. A pin 16 is passed through the limiting hole 12, and the end of the pin 16 can be placed in the limiting groove 15. During installation, the end of the limiting cylinder 14 is placed in the slide groove 11, and by observing the corresponding relationship between the limiting groove 15 and the limiting hole 12, the pin 16 is easily inserted. The side wall of the pin 16 abuts against the side wall of the limiting groove 15, thus completing the axial limitation of the sealing tube 3. Similarly, when disassembly is required, the axial limitation can be released by simply pulling out the pin 16, which simplifies the maintenance process and effectively prevents the connection from loosening or falling off due to vibration or other external forces. When the sealing tube 3 and the movable tube 1 need to be rotated, the limiting groove 15 will rotate relative to the pin 16.

[0026] like Figure 2As shown, the sealing tube 3 is provided with an annular sliding groove 17 at one end close to the static tube 2, and a retaining ring 18 slides in the sliding groove 17. An annular filling groove 19 is provided at the end of the retaining ring 18 close to the center of the sealing tube 3. The filling groove 19 is filled with a filler, which can abut against the side wall of the sliding groove 17. The wind pressure entering the pipeline provides a thrust for the retaining ring 18, so that it fits tightly against the side wall of the sliding groove 17, and forms an end face sealing structure through the contact between the filler and the side wall of the sliding groove 17, which not only improves the reliability of the seal, but also effectively prevents gas leakage. When the filler fails, the wind pressure will push the retaining ring 18 to squeeze the filler, thereby improving the utilization rate of the filler. Since the filler in the filler groove 19 forms an additional sealing layer, the sealing burden of the metal gas ring 5 is reduced, and its wear rate is reduced, which helps to extend the service life of the metal gas ring 5 and reduce the frequency of replacement and maintenance. The filling groove 19 can be filled with different types of fillers to achieve different effects, such as lubricating fillers and high-temperature resistant fillers. The lubricating fillers can facilitate the sliding of the retaining ring 18, and the high-temperature resistant fillers can improve the high-temperature resistance of the sealing device.

[0027] The fit tolerance between the sealing tube 3 and the static tube 2 is between 0.025 and 0.045 mm. This tolerance ensures the precise fit between the sealing tube 3 and the static tube 2, helping to reduce assembly errors and improve the performance and reliability of the entire sealing device. A certain clearance allows a certain degree of freedom for relative rotation between the sealing tube 3 and the static tube 2, reducing frictional resistance and wear. This helps extend the service life of the sealing tube 3 and maintains the smooth operation of the piping system.

[0028] like Figure 1-4 As shown, a support ring 20 is fixed inside the static pipe 2. When the static pipe 2 is subjected to high pressure and temperature fluctuations for a long time, the support ring 20 provides additional support and reinforcement for the static pipe 2. The support ring 20 can effectively prevent the static pipe 2 from deforming and enable the static pipe 2 to maintain a stable shape and size.

[0029] like Figure 6 As shown, the gaps 6 of adjacent metal air rings 5 ​​are offset by 180 degrees. When the gaps 6 of adjacent metal air rings 5 ​​are offset by 180 degrees, the openings of the two metal air rings 5 ​​do not overlap on the same axis, reducing the possibility of gas leakage through the gaps 6. Even if there is a slight leak at the opening of one metal air ring 5, the opening of the other metal air ring 5 will block the leakage path due to its misalignment, thereby enhancing the overall sealing effect.

[0030] The movable tube 1 and the sealing tube 3 are connected via pipe threads. Pipe thread connections inherently offer a certain degree of sealing performance. Through precise machining and fitting, the gaps between the threads can be effectively controlled, thereby reducing gas leakage. Compared to traditional welding or riveting methods, pipe thread connections are easier to disassemble.

[0031] Example 2, as Figure 5 、 6 As shown, the rotating connector includes a fixing ring 7 fixed to the sealing tube 3. The sealing tube 3 is covered with a connecting sleeve 8. The end of the connecting sleeve 8 close to the moving tube 1 is fixed with a limit plate. The fixing ring 7 is abutted against the limit plate via a plane bearing 9. The end of the connecting sleeve 8 away from the limit plate is screwed to the static tube 2 via an internal thread. Before installation, the connecting sleeve 8 is first put on the moving tube 1, and then the sealing tube 3 is fixedly connected to the moving tube 1. When the moving tube 1 and the static tube 2 need to be connected, the internal thread of the sleeve is fixedly connected to the static tube 2. The cooperation of the internal threads can effectively prevent the sealing device from loosening or falling off during rotation. The sleeve is rotatably connected to the fixing ring 7 via a plane bearing 9. The fixing ring 7 can also be fixedly connected to the end of the static tube 2 via the plane bearing 9. When the moving tube 1 needs to rotate, the plane bearing 9 allows the sealing tube 3 and the static tube 2 to rotate relative to each other. The flat bearing 9 enables relatively smooth rotation between the retaining ring 7 and the connecting sleeve 8, ensuring that the movable tube 1 can rotate freely when needed without excessive resistance or friction, reducing energy loss and improving the overall efficiency of the piping system. The internal threaded connection effectively prevents the sealing device from loosening or falling off during rotation. The flat bearing 9 and retaining ring 7 also provide stable support, ensuring that the movable tube 1 remains stable during rotation. The remaining structure of this embodiment is the same as that of Example 1.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary sealing structure for a combustion-supporting air duct of a heat storage type ladle baking device, comprising a moving tube (1) and a static tube (2), characterized in that: A sealing tube (3) is fixed on the outer side of the moving tube (1). The sealing tube (3) is provided with a plurality of sealing grooves (4). Metal air rings (5) with a certain elasticity are clamped in the sealing grooves (4). The metal air rings (5) are provided with notches (6). The notches (6) are arranged in an interlaced manner. The sealing tube (3) is connected to the inner side surface of the static tube (2) in a sealed and rotatable manner through the metal air rings (5). A rotating connector is provided on the sealing tube (3). The rotating connector cooperates with the static tube (2) to limit the axial movement of the sealing tube (3).

2. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: The rotating connecting member comprises a fixing ring (7) fixed on the sealing tube (3); a connecting sleeve (8) is provided on the outer shell of the sealing tube (3); a limiting plate is fixed on one end of the connecting sleeve (8) close to the moving tube (1); the fixing ring (7) abuts against the limiting plate via a plane bearing (9); and an end of the connecting sleeve (8) away from the limiting plate is screwed to the static tube (2) via an internal thread.

3. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: A rotating ring (10) is fixed to the outer wall of the static tube (2), a sliding groove (11) is provided on the side of the rotating ring (10) close to the moving tube (1), and a limiting hole (12) connected to the sliding groove (11) is provided on the side wall of the rotating ring (10). An annular connecting plate (13) is fixed on the sealing tube (3), and a limiting cylinder (14) is fixed on the side of the connecting plate (13) close to the rotating ring (10). The end of the limiting cylinder (14) away from the connecting plate (13) is placed in the sliding groove (11), and an annular limiting groove (15) is provided on the outer wall of the limiting cylinder (14). The limiting groove (15) corresponds to the limiting hole (12), and a pin (16) is passed through the limiting hole (12), and the end of the pin (16) can be placed in the limiting groove (15).

4. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: The sealing tube (3) is provided with an annular sliding groove (17) at one end close to the static tube (2), a retaining ring (18) slides in the sliding groove (17), and an annular filling groove (19) is provided at one end of the retaining ring (18) close to the center of the sealing tube (3). The filling groove (19) is filled with a filler, and the filler can abut against the side wall of the sliding groove (17).

5. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: A support ring (20) is fixed inside the static pipe (2).

6. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: The staggered angle between the notches (6) of the adjacent metal air rings (5) is 180 degrees.

7. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: The moving pipe (1) and the sealing pipe (3) are connected via pipe threads.

8. The rotary sealing structure for the combustion-supporting air duct of a heat storage type ladle baking device according to claim 1, characterized in that: The matching tolerance between the sealing tube (3) and the static tube (2) is between 0.025-0.045 mm.

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