A sealing structure for waste heat boiler pipes

Abstract

This invention relates to the field of waste heat boiler pipeline sealing technology, specifically a waste heat boiler pipeline sealing structure, comprising: a sealing mechanism and an installation mechanism on a bypass valve pipeline, the installation mechanism being equipped with a locking mechanism; this invention can achieve coordinated multi-stage sealing of key areas such as the outer circumference, end plane, and inner wall of the bypass valve pipeline, and provide large-area cylindrical sealing of the outer and inner walls of the bypass valve pipeline where they are in direct contact with flue gas; simultaneously, the multiple sealing structures can form redundant protection, so even if a local sealing ring ages or is damaged, the remaining sealing structures can still maintain an effective sealing state, avoiding immediate leakage due to single-point failure; it can also achieve adaptive displacement compensation through an elastic compensation structure when the internal pressure of the bypass valve pipeline changes, and when the elastic compensation structure undergoes elastic displacement, an additional radial clamping force can be applied to the cylindrical sealing ring through a mechanical linkage structure.

Description

Technical Field

[0001] This invention relates to the field of waste heat boiler pipe sealing technology, specifically a waste heat boiler pipe sealing structure. Background Technology

[0002] Waste heat boilers, as a type of high-efficiency energy recovery device, do not burn fuel themselves. Instead, they are specifically designed to recover the waste heat contained in the high-temperature exhaust gas emitted during industrial production processes and convert it into steam energy. To ensure the long-term stable operation of the waste heat boiler system and meet environmental protection requirements, a dust collector is usually installed in the flue gas passage of the waste heat boiler. This device can effectively capture and remove particulate matter carried in the high-temperature flue gas, thereby ensuring the normal operation of subsequent equipment and reducing emissions.

[0003] In existing technologies, dust collector bypass pipelines are usually equipped with dedicated bypass valves to isolate the dust collector when necessary for system protection. These valve pipelines generally adopt a double sealing structure. The first is an outer mechanical locking seal formed by bolting the end cap to the valve body pipeline end. The second is an elastic abutment seal formed by the spring-preloaded elastic sealing plate on the inner side of the pipeline and the flange on the inner wall of the valve body pipeline. The above-mentioned double sealing structure can not only effectively block gas leakage, but also compensate for pressure fluctuations in the pipeline by relying on the adaptive displacement of the elastic sealing plate, thereby maintaining sealing reliability under complex operating conditions.

[0004] However, the traditional sealing structure for bypass valves in dust collector ducts has the following problems: 1. In existing technology, the double-sealing structure of bypass valves in dust collector ducts relies on the outer end cap and inner elastic sealing plate to achieve sealing contact with the annular rubber rings between the outer end and inner wall flange of the valve body pipe, respectively. Since the sealing rubber rings are constantly exposed to the high temperature and dust environment inside the valve body pipe, and their structural thickness is usually limited, the rubber ring material is prone to aging, hardening, or wear, resulting in a decrease in sealing performance. Therefore, the sealing structure of the bypass valve pipe requires frequent maintenance and rubber ring replacement in practical applications, which not only increases the frequency of system downtime... Secondly, it affects the overall operating efficiency of the waste heat boiler and dust collector, thereby affecting the continuity and reliability of the overall operation; 2. In the existing technology, the annular sealing ring used in the double sealing structure of the bypass valve pipeline is prone to damage and aging due to long-term direct contact with high-temperature dusty flue gas, and its structural thickness is relatively limited. Therefore, once the sealing ring ages or fails, its limited thickness is difficult to maintain an effective seal, which may immediately cause the valve to not seal properly or even leak significantly. If the damaged sealing parts are not detected and replaced in time, the continuous leakage of high-temperature flue gas will not only affect the normal operation of the system, but also cause a series of risks such as environmental pollution and equipment corrosion. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste heat boiler pipeline sealing structure, including a bypass valve pipeline, wherein a sealing mechanism and an installation mechanism are provided on the bypass valve pipeline, and a locking mechanism is provided on the installation mechanism.

[0006] The installation mechanism includes a docking installation part located at the upper end of the bypass valve pipeline, and a sealing installation part provided on the docking installation part for docking installation and sealing the outside of the bypass valve pipeline.

[0007] The sealing mechanism includes an end face sealing part disposed on the upper side of the docking mounting part and cooperating with the sealing mounting part to seal the end face of the bypass valve pipeline; an inner support and tightening part disposed on the lower side of the end face sealing part and located inside the bypass valve pipeline; and a docking sealing part disposed on the lower side of the end face sealing part and the outer side of the inner support and tightening part, which cooperates with the sealing mounting part to lock and seal.

[0008] The locking mechanism includes an elastic expansion part disposed on the sealed mounting part and cooperating with the inner support and tightening part to enable the mating sealing part to perform a large-area cylindrical seal on the inner wall of the bypass valve pipeline. The elastic expansion part is also used to adaptively compensate for pressure changes in the bypass valve pipeline. The elastic expansion part is provided with a mating locking part and a self-locking expansion part. The mating locking part and the self-locking expansion part cooperate to achieve simultaneous enhanced compression and sealing of the large-area cylindrical seal on the inner wall of the bypass valve pipeline when the elastic expansion part adaptively compensates for displacement.

[0009] Preferably, the docking installation part includes a docking ring fixedly disposed on the upper side of the bypass valve pipeline. The outer side of the docking ring is provided with an external thread groove, and the upper end face of the docking ring is uniformly provided with a plurality of docking arc grooves with upper openings, wherein the adjacent ends of two adjacent docking arc grooves overlap radially along the docking ring.

[0010] Preferably, the sealed mounting part includes a mounting sleeve installed on the outside of the docking ring. The inner surface of the mounting sleeve is provided with an internal thread groove that is threadedly connected to the external thread groove. A docking rotating plate is rotatably provided at the upper end inside the mounting sleeve. An arc-shaped insert plate that corresponds to and is inserted into the docking arc groove is fixedly provided on the lower side of the docking rotating plate.

[0011] Preferably, the end face sealing part includes a fixing ring disposed on the lower side of the docking rotating plate, an upper annular sealing gasket is fixedly disposed on the upper side of the fixing ring, and an arc-shaped slot is provided on both the fixing ring and the upper annular sealing gasket, which is vertically connected and corresponds to the arc-shaped insert plate.

[0012] Preferably, the inner support clamping part includes a plurality of inner support springs that are uniformly fixed in the circumference of the inner side of the fixed ring and located on the inner side of the arc-shaped slot. An arc-shaped support plate is fixedly provided on the lower side of the inner support springs. A through gap is provided between adjacent inner support springs and the arc-shaped support plate. Symmetrical mating grooves are provided at the adjacent ends of adjacent inner support springs.

[0013] Preferably, the mating groove is connected to the cylindrical space formed by the inner side of each inner support spring, the lower end of the mating groove is arc-shaped, and the width of the mating groove along the radial direction of the fixing ring narrows uniformly from bottom to top, wherein two adjacent mating grooves together form a set of mating grooves.

[0014] Preferably, the mating sealing part includes a lower annular sealing gasket fixedly disposed on the lower side of the fixing ring, a sealing sleeve fixedly disposed on the lower side of the lower annular sealing gasket and inserted into the mating arc groove one by one, and an arc-shaped slot two with an upper opening on both the lower annular sealing gasket and the sealing sleeve and inserted into the arc-shaped insert plate one by one. A cylindrical sealing ring is fixedly disposed on the lower side of the lower annular sealing gasket and inside the sealing sleeve, and the inner surface of the cylindrical sealing ring is fixedly connected to the outer surface of each inner support spring.

[0015] Preferably, the elastic tensioning part includes a sleeve fixedly disposed on the lower side of the docking rotating plate, and a telescopic column that moves up and down is elastically slidably disposed inside the sleeve by a spring. The lower end of the telescopic column is fixedly disposed with a tensioning plate that presses against the inner surface of each inner support spring, and the lower side of the tensioning plate is fixedly disposed with a sealing ring that engages with each arc-shaped support plate.

[0016] Preferably, the docking locking part includes an L-shaped locking plate that is circumferentially and uniformly fixed on the outer surface of the lower end of the sleeve. The L-shaped locking plate corresponds to each set of docking grooves. The connection between the horizontal and vertical sections of the L-shaped locking plate is an inclined surface. A reinforcing plate that is fixedly connected to the outer surface of the sleeve is symmetrically fixed on the upper side of the horizontal section of the L-shaped locking plate along the width direction.

[0017] Preferably, the self-locking tensioning part includes a support first fixedly mounted on the upper side of the tensioning plate and corresponding to the L-shaped locking plate. A spring rod is symmetrically and elastically slidably mounted on the support first along the length direction and moves radially along the tensioning plate. A U-shaped frame is fixedly mounted on the side of the symmetrical spring rod away from the sleeve. An tensioning wheel is rotatably mounted inside the U-shaped frame and presses against a corresponding set of mating grooves. A fixing plate is fixedly mounted on the side of the symmetrical spring rod near the sleeve. A locking wheel is rotatably mounted on the upper end of the fixing plate through the support second and locks against the vertical section of the corresponding L-shaped locking plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention, through the coordinated operation of the installation mechanism, sealing mechanism and locking mechanism, can achieve multi-level sealing of key areas such as the outer circumference, end plane and inner wall of the bypass valve pipeline, and perform cylindrical large-area sealing of the outer side and inner wall of the bypass valve pipeline where it is in direct contact with smoke and dust, thereby greatly increasing the effective sealing area and sealing duration, extending the overall sealing life and reducing the frequency of maintenance and sealing ring replacement. At the same time, the multiple sealing structures can form redundancy protection. Even if the local sealing ring ages or is damaged, the remaining sealing structures can still maintain an effective sealing state, avoiding immediate leakage due to single-point failure, thereby improving the continuity, reliability and overall operation efficiency of the system.

[0019] 2. Through the cooperation of the installation mechanism, sealing mechanism, and locking mechanism, this invention can also achieve adaptive displacement compensation through the elastic compensation structure when the internal pressure of the bypass valve pipeline changes, so as to effectively absorb the mechanical stress caused by pressure fluctuation. Furthermore, when the elastic compensation structure undergoes elastic displacement, an additional radial clamping force can be applied to the cylindrical sealing ring through the mechanical linkage structure, achieving a self-reinforcing sealing effect of tightening with increasing pressure. This not only significantly improves the sealing reliability of the valve under fluctuating operating conditions, but also effectively avoids the risk of sealing failure caused by sudden pressure changes, thereby ensuring the stability and safety of the entire system during continuous operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a frontal cross-sectional view of the structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the docking and installation structure.

[0023] Figure 4 This is a partial cross-sectional schematic diagram of the sealed installation section.

[0024] Figure 5 This is a schematic diagram of the sealing mechanism.

[0025] Figure 6 This is a schematic diagram of the end face sealing part.

[0026] Figure 7 This is a partial cross-sectional schematic diagram of the internal support and clamping section.

[0027] Figure 8 This is a partial cross-sectional schematic diagram of the sealing part.

[0028] Figure 9 This is a partial cross-sectional schematic diagram of the locking mechanism.

[0029] In the diagram: 1. Bypass valve pipeline; 2. Installation mechanism; 21. Connecting mounting part; 211. Connecting ring; 212. External thread groove; 213. Connecting arc groove; 22. Sealing mounting part; 221. Mounting sleeve; 222. Internal thread groove; 223. Connecting rotating plate; 224. Arc-shaped insert plate; 3. Sealing mechanism; 31. End face sealing part; 311. Fixing ring; 312. Upper annular sealing gasket; 313. Arc-shaped slot one; 32. Inner support clamping part; 321. Inner support spring; 322. Arc-shaped support plate; 323. 33. Pressure groove; 33. Butt sealing part; 331. Lower annular sealing gasket; 332. Sealing sleeve; 333. Arc-shaped slot two; 334. Cylindrical sealing ring; 4. Locking mechanism; 41. Elastic expansion part; 411. Sleeve; 412. Telescopic column; 413. Expansion plate; 414. Sealing ring; 42. Butt locking part; 421. L-shaped locking plate; 422. Reinforcing plate; 43. Self-locking expansion part; 431. Spring rod; 432. U-shaped frame; 433. Expansion wheel; 434. Fixing plate; 435. Locking wheel. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1 and Figure 2 A waste heat boiler pipeline sealing structure includes a bypass valve pipeline 1, on which a sealing mechanism 3 and an installation mechanism 2 are provided, and on which a locking mechanism 4 is provided.

[0032] Please see Figure 1 and Figure 2 The installation mechanism 2 includes a docking installation part 21 disposed at the upper end of the bypass valve pipeline 1. The docking installation part 21 is provided with a sealing installation part 22 for docking installation with the docking installation part 21 and for cylindrical sealing of the upper end of the bypass valve pipeline 1.

[0033] Please see Figure 2 and Figure 3 The docking installation part 21 includes a docking ring 211 fixedly installed on the upper side of the bypass valve pipeline 1. The outer side of the docking ring 211 is provided with an external thread groove 212. The upper end face of the docking ring 211 is uniformly provided with a plurality of docking arc grooves 213 with upper openings, wherein the adjacent ends of two adjacent docking arc grooves 213 overlap radially along the docking ring 211.

[0034] Please see Figure 1 , Figure 2 and Figure 4 The sealed mounting part 22 includes a mounting sleeve 221 threadedly mounted on the outside of the docking ring 211. The inner surface of the mounting sleeve 221 is provided with an inner thread groove 222 that is threadedly connected to the outer thread groove 212. The upper end of the mounting sleeve 221 is rotatably provided with a docking rotating plate 223. The lower side of the docking rotating plate 223 is fixedly provided with an arc-shaped insert plate 224 that corresponds to and is inserted into the docking arc groove 213.

[0035] When sealing the outside of the bypass valve pipeline 1 to a certain extent, first align the arc-shaped insert 224 with the corresponding mating arc groove 213. Then, rotate the mounting sleeve 221 so that its inner thread groove 222 engages with the outer thread groove 212 of the mating ring 211. The arc-shaped insert 224 is then inserted into the corresponding mating arc groove 213, and the mounting sleeve 221 rotates relative to the mating rotating plate 223 until the mounting sleeve 221 is fully threaded onto the outside of the mating ring 211. At this point, the upper end of the bypass valve pipeline 1 is sealed through the mounting sleeve 221. The sealing, along with the multi-stage threaded locking between the internal threaded groove 222 and the external threaded groove 212, can achieve a certain degree of sealing on the upper end and the outside of the bypass valve pipeline 1. At the same time, through the insertion and cooperation of the overlapping arc-shaped insert plate 224 and the mating arc groove 213, as well as the threaded cooperation between the internal threaded groove 222 and the external threaded groove 212, the direct leakage channels and leakage space of flue gas can be greatly reduced. Thus, after the aging and failure of the sealing rings or gaskets on the bypass valve pipeline 1, rapid leakage of flue gas can be effectively prevented, providing a longer reaction time for shutdown and maintenance.

[0036] Please see Figure 2 and Figure 5 The sealing mechanism 3 includes an end face sealing part 31 disposed on the upper side of the docking mounting part 21 and cooperating with the sealing mounting part 22 to seal the end face of the bypass valve pipeline 1. An inner support and tightening part 32 is disposed on the lower side of the end face sealing part 31 and located inside the bypass valve pipeline 1. A docking sealing part 33 is disposed on the lower side of the end face sealing part 31 and the outer side of the inner support and tightening part 32, which cooperates with the sealing mounting part 22 to dock and lock the seal.

[0037] Please see Figure 2 , Figure 5 and Figure 6 The end face sealing part 31 includes a fixing ring 311 disposed on the lower side of the docking rotating plate 223. An upper annular sealing gasket 312 is fixedly disposed on the upper side of the fixing ring 311. An arc-shaped slot 313 is opened on both the fixing ring 311 and the upper annular sealing gasket 312, which is vertically through and corresponds to the arc-shaped insert plate 224 for insertion.

[0038] When the lower side of the docking plate 223 is to be stably sealed, the fixing ring 311 is first placed on the upper side of the docking ring 211, and the arc-shaped slot 313 is aligned with the docking arc groove 213. Then, the mounting sleeve 221 is fully threaded onto the outside of the docking ring 211, and the arc-shaped insert 224 is inserted into the corresponding arc-shaped slot 313 and docking arc groove 213. The docking plate 223 then fits and presses against the upper annular sealing gasket 312, thereby achieving a stable seal on the lower side of the docking plate 223.

[0039] Please see Figure 2 , Figure 5 , Figure 6 and Figure 7 The inner support clamping part 32 includes a plurality of inner support spring pieces 321 that are uniformly fixed in the circumference below the fixing ring 311 and inside the arc-shaped slot 313. An arc-shaped support plate 322 is fixedly provided on the lower side of the inner support spring piece 321. The arc-shaped support plates 322 together form an approximately ring-shaped structure. A small gap is opened between adjacent inner support spring pieces 321 and arc-shaped support plates 322. A symmetrical mating groove 323 is opened at the adjacent ends of adjacent inner support spring pieces 321.

[0040] The docking groove 323 is connected to the cylindrical space formed by the inner side of each inner support spring 321. The lower end of the docking groove 323 is arc-shaped. The width of the docking groove 323 along the radial direction of the fixing ring 311 narrows uniformly from bottom to top. Two adjacent docking grooves 323 together form a set of docking grooves 323.

[0041] Please see Figure 3 , Figure 5 , Figure 7 and Figure 8 The mating sealing part 33 includes a lower annular sealing gasket 331 fixedly disposed on the lower side of the fixing ring 311. A sealing sleeve 332 corresponding to the mating arc groove 213 is fixedly disposed on the lower side of the lower annular sealing gasket 331. The lower annular sealing gasket 331 and the sealing sleeve 332 are both provided with an arc-shaped slot 2 333 with an upper opening that corresponds to the arc-shaped insert plate 224. The arc-shaped slot 2 333 is similar in shape to the corresponding arc-shaped slot 1 313, but with a smaller cross-sectional area. A cylindrical sealing ring 334 is fixedly disposed on the lower side of the lower annular sealing gasket 331 and inside the sealing sleeve 332. The inner surface of the cylindrical sealing ring 334 is fixedly connected to the outer surface of each inner support spring 321.

[0042] When sealing the end face of the bypass valve pipeline 1, first place the fixing ring 311 on the upper side of the docking ring 211, and insert the sealing sleeve 332 on the lower side of the lower annular sealing gasket 331 into the corresponding docking arc groove 213. Then, install the mounting sleeve 221 on the docking ring 211, and simultaneously insert the arc-shaped insert plate 224 into the corresponding arc-shaped slot one 313 and arc-shaped slot two 333. The docking plate 223 then comes into close contact with the upper annular sealing gasket 312, and the fixing ring 311 comes into close contact with the upper end face of the docking ring 211 through the lower annular sealing gasket 331. Since the cross-sectional area of ​​the arc-shaped slot two 333 is small, the inserted arc-shaped insert plate 224 expands the corresponding sealing sleeve 332 outward. The arc-shaped insert plate 224 then comes into stable close contact with the corresponding docking arc groove 213 through the sealing sleeve 332, thereby achieving a stable multi-stage seal on the outer side and end face of the bypass valve pipeline 1 and the docking ring 211.

[0043] Please see Figure 2 The locking mechanism 4 includes an elastic expansion part 41 disposed on the sealed mounting part 22 and cooperating with the inner support and tightening part 32 to enable the docking sealing part 33 to perform a large-area cylindrical seal on the inner wall of the bypass valve pipeline 1. The elastic expansion part 41 is also used to adaptively compensate for pressure changes in the bypass valve pipeline 1. The elastic expansion part 41 is provided with a docking locking part 42 and a self-locking expansion part 43. The docking locking part 42 and the self-locking expansion part 43 cooperate to achieve enhanced compression and sealing of the large-area cylindrical seal on the inner wall of the bypass valve pipeline 1 when the elastic expansion part 41 adaptively compensates for displacement, so as to enhance the sealing effect of the inner wall of the bypass valve pipeline 1 when pressure fluctuates.

[0044] Please see Figure 2 and Figure 9 The elastic expansion part 41 includes a sleeve 411 fixedly disposed on the lower side of the docking rotating plate 223. A telescopic column 412 that moves up and down is elastically slidably disposed inside the sleeve 411 by a spring. An expansion plate 413 that presses against the inner surface of each inner support spring 321 is fixedly disposed at the lower end of the telescopic column 412. The frictional resistance between the expansion plate 413 and the inner surface of each inner support spring 321 can be reduced by installing ball bearings or applying lubricating oil to the outer arc surface of the expansion plate 413. A sealing ring 414 that engages with each arc-shaped support plate 322 is fixedly disposed on the lower side of the expansion plate 413.

[0045] When the fixing ring 311 is placed on the upper side of the docking ring 211, each inner support spring 321 drives the cylindrical sealing ring 334 to insert into the inner side of the docking ring 211 and the bypass valve pipeline 1. During the process of installing the mounting sleeve 221 to the outside of the docking ring 211, the docking rotating plate 223 drives the expansion plate 413 and the sealing ring 414 to insert into the inner side of each inner support spring 321 through the sleeve 411 and the telescopic column 412, and simultaneously expands and squeezes each inner support spring 321 outward, and each inner support spring 321 then stably squeezes the cylindrical sealing ring 334. The sealing ring 414 is pressed tightly against the inner wall of the docking ring 211 and the bypass valve pipe 1 until it contacts and abuts against the inner side of each arc-shaped support plate 322 and can no longer move downward. The telescopic column 412 then continuously compresses the spring. The reaction force of the spring causes the tension plate 413 to stably squeeze the inner support spring 321 and make the sealing ring 414 and the arc-shaped support plate 322 stably abut against each other until the mounting sleeve 221 is completely installed on the docking ring 211. At this time, the cylindrical sealing ring 334 can stably press and seal against the inner wall of the docking ring 211 and the bypass valve pipe 1.

[0046] The above-described operation method enables coordinated multi-stage sealing of key areas such as the outer circumference, end plane, and inner wall of the bypass valve pipeline 1, and provides a large-area cylindrical seal for the outer and inner walls of the bypass valve pipeline 1 where it directly contacts the smoke and dust. This significantly increases the effective sealing area and sealing duration, extends the overall sealing life, and reduces the frequency of maintenance, repair, and seal replacement. At the same time, the multiple sealing structures provide redundancy, so even if a local seal ages or is damaged, the remaining sealing structures can still maintain an effective sealing state, avoiding immediate leakage due to single-point failure. This improves the continuity, reliability, and overall operational efficiency of the system.

[0047] Please see Figure 2 and Figure 9 The docking locking part 42 includes an L-shaped locking plate 421 that is circumferentially and uniformly fixed on the outer surface of the lower end of the sleeve 411. The L-shaped locking plate 421 corresponds one-to-one with each set of docking pressure grooves 323. The connection between the horizontal and vertical sections of the L-shaped locking plate 421 is an inclined surface. A reinforcing plate 422 that is fixedly connected to the outer surface of the sleeve 411 is symmetrically fixed on the upper side of the horizontal section of the L-shaped locking plate 421 along the width direction.

[0048] Please see Figure 2 and Figure 9The self-locking tensioning part 43 includes a support fixedly mounted on the upper side of the tensioning plate 413 and corresponding to the L-shaped locking plate 421. A spring rod 431 that moves radially along the tensioning plate 413 is symmetrically and elastically slidably mounted on the support along the length direction. A U-shaped frame 432 is fixedly mounted on the side of the symmetrical spring rod 431 away from the sleeve 411. An tensioning wheel 433 that is rotatably mounted inside the U-shaped frame 432 and presses against a corresponding set of mating grooves 323 is mounted. A fixing plate 434 is fixedly mounted on the side of the symmetrical spring rod 431 close to the sleeve 411. A locking wheel 435 that is rotatably mounted on the upper end of the fixing plate 434 through the support and locks against the vertical section of the corresponding L-shaped locking plate 421 is mounted.

[0049] As the tension plate 413 and sealing ring 414 move downward with the docking rotating plate 223, the tension wheel 433 first docks with the upper end of the corresponding docking groove 323. As the tension plate 413 and sealing ring 414 continue to move downward, the tension wheel 433 also moves synchronously and remains stably fitted with the corresponding docking groove 323 under the continuous elastic action of the corresponding spring rod 431 until the tension wheel 433 stably fits with the lower arc surface of the docking groove 323. At this point, the tension plate 413 and sealing ring 414 can no longer move downward, and the sleeve 411 then interacts with the telescopic column 412. As the sleeve 411 moves relative to the corresponding locking wheel 435, the L-shaped locking plate 421 on the sleeve 411 also moves relative to the corresponding locking wheel 435 until the mounting sleeve 221 is completely installed on the outside of the docking ring 211. At this time, the lower end of the vertical section of the L-shaped locking plate 421 is then pressed against the corresponding locking wheel 435, and the corresponding tensioning wheel 433 is also completely pressed against the lower end of the corresponding set of docking grooves 323, so that the tensioning wheel 433 and the corresponding spring rod 431 can no longer move radially along the tensioning plate 413. The inclined surface on the L-shaped locking plate 421 can ensure that the lower end of its vertical section can be stably fitted with the locking wheel 435.

[0050] When the internal pressure of the bypass valve pipeline 1 increases, the expansion plate 413 drives the telescopic column 412 to compress the spring for adaptive displacement compensation. The expansion wheel 433 moves synchronously and applies stable pressure to the corresponding set of docking grooves 323. Each inner support spring 321 is then further pressed outward and pressed against the inner wall of the bypass valve pipeline 1. Thus, the cylindrical sealing ring 334 is further pressed and sealed against the docking ring 211 and the inner wall of the bypass valve pipeline 1 by the inner support spring 321.

[0051] The above-described operation method enables adaptive displacement compensation through the elastic compensation structure when the internal pressure of the bypass valve pipeline 1 changes, effectively absorbing the mechanical stress caused by pressure fluctuations. Furthermore, when the elastic compensation structure undergoes elastic displacement, an additional radial clamping force can be applied to the cylindrical sealing ring 334 through the mechanical linkage structure, achieving a self-reinforcing sealing effect that tightens with increasing pressure. This not only significantly improves the sealing reliability of the valve under fluctuating operating conditions but also effectively avoids the risk of sealing failure caused by sudden pressure changes, thereby ensuring the stability and safety of the entire system during continuous operation.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first," "second," "number one," and "number two" 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. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "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 or an electrical connection; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A sealing structure for a waste heat boiler pipeline, including a bypass valve pipeline, characterized in that: The bypass valve pipeline is equipped with a sealing mechanism and an installation mechanism, and the installation mechanism is equipped with a locking mechanism. The installation mechanism includes a docking installation part located at the upper end of the bypass valve pipeline, and a sealing installation part provided on the docking installation part for docking installation and sealing the outside of the bypass valve pipeline. The sealing mechanism includes an end face sealing part disposed on the upper side of the docking mounting part and cooperating with the sealing mounting part to seal the end face of the bypass valve pipeline; an inner support and tightening part disposed on the lower side of the end face sealing part and located inside the bypass valve pipeline; and a docking sealing part disposed on the lower side of the end face sealing part and the outer side of the inner support and tightening part, cooperating with the sealing mounting part to lock and seal. The locking mechanism includes an elastic expansion part disposed on the sealed mounting part and cooperating with the inner support and tightening part to enable the mating sealing part to perform a large-area cylindrical seal on the inner wall of the bypass valve pipeline. The elastic expansion part is also used to adaptively compensate for pressure changes in the bypass valve pipeline. The elastic expansion part is provided with a mating locking part and a self-locking expansion part. The mating locking part and the self-locking expansion part cooperate to simultaneously strengthen the compression and sealing of the large-area cylindrical seal on the inner wall of the bypass valve pipeline when the elastic expansion part adaptively compensates for displacement.

2. The waste heat boiler pipe sealing structure according to claim 1, characterized in that: The docking installation part includes a docking ring fixedly installed on the upper side of the bypass valve pipeline. The outer side of the docking ring is provided with an external thread groove. The upper end face of the docking ring is uniformly provided with a plurality of docking arc grooves with upper openings, wherein the adjacent ends of two adjacent docking arc grooves overlap radially along the docking ring.

3. The waste heat boiler pipe sealing structure according to claim 2, characterized in that: The sealed installation part includes an installation sleeve installed on the outside of the docking ring. The inner surface of the installation sleeve is provided with an internal thread groove that is threadedly connected to the external thread groove. A docking rotating plate is rotatably installed at the upper end inside the installation sleeve. An arc-shaped insert plate that corresponds to and is inserted into the docking arc groove is fixedly installed on the lower side of the docking rotating plate.

4. The waste heat boiler pipe sealing structure according to claim 3, characterized in that: The end face sealing part includes a fixing ring disposed on the lower side of the docking rotating plate, an upper annular sealing gasket fixedly disposed on the upper side of the fixing ring, and an arc-shaped slot that is vertically connected and corresponding to the arc-shaped insert plate is opened on both the fixing ring and the upper annular sealing gasket.

5. The waste heat boiler pipe sealing structure according to claim 4, characterized in that: The inner support clamping part includes a plurality of inner support spring pieces that are uniformly fixed in the circumference of the inner side of the fixed ring and located on the inner side of the arc-shaped slot. An arc-shaped support plate is fixedly installed on the lower side of the inner support spring pieces. A through gap is opened between adjacent inner support spring pieces and arc-shaped support plates. Symmetrical mating grooves are opened at the adjacent ends of adjacent inner support spring pieces.

6. The waste heat boiler pipe sealing structure according to claim 5, characterized in that: The mating groove is connected to the cylindrical space formed by the inner side of each inner support spring. The lower end of the mating groove is arc-shaped. The width of the mating groove along the radial direction of the fixing ring narrows uniformly from bottom to top. Two adjacent mating grooves together form a set of mating grooves.

7. The waste heat boiler pipe sealing structure according to claim 4, characterized in that: The mating sealing part includes a lower annular sealing gasket fixedly disposed on the lower side of the fixed ring. A sealing sleeve is fixedly disposed on the lower side of the lower annular sealing gasket, which is inserted into the mating arc groove one by one. The lower annular sealing gasket and the sealing sleeve are both provided with an arc-shaped slot two with an upper opening that is inserted into the arc-shaped insert plate one by one. A cylindrical sealing ring is fixedly disposed on the lower side of the lower annular sealing gasket and inside the sealing sleeve. The inner surface of the cylindrical sealing ring is fixedly connected to the outer surface of each inner support spring.

8. A waste heat boiler pipe sealing structure according to claim 5, characterized in that: The elastic tensioning part includes a sleeve fixedly installed on the lower side of the docking rotating plate. A telescopic column that moves up and down is elastically slidably installed inside the sleeve by a spring. An tensioning plate that presses against the inner surface of each inner support spring is fixedly installed at the lower end of the telescopic column. A sealing ring that engages with each arc-shaped support plate is fixedly installed on the lower side of the tensioning plate.

9. A waste heat boiler pipe sealing structure according to claim 8, characterized in that: The docking locking part includes an L-shaped locking plate that is circumferentially and uniformly fixed on the outer surface of the lower end of the sleeve. The L-shaped locking plate corresponds to each set of docking grooves. The connection between the horizontal and vertical sections of the L-shaped locking plate is an inclined surface. A reinforcing plate that is fixedly connected to the outer surface of the sleeve is symmetrically fixed on the upper side of the horizontal section of the L-shaped locking plate along the width direction.

10. A waste heat boiler pipe sealing structure according to claim 9, characterized in that: The self-locking tensioning part includes a support first fixedly mounted on the upper side of the tensioning plate and corresponding to the L-shaped locking plate. A spring rod is symmetrically and elastically slidably mounted on the support first along the length direction and moves radially along the tensioning plate. A U-shaped frame is fixedly mounted on the side of the symmetrical spring rod away from the sleeve. An tensioning wheel is rotatably mounted inside the U-shaped frame and presses against a corresponding set of mating grooves. A fixing plate is fixedly mounted on the side of the symmetrical spring rod near the sleeve. A locking wheel is rotatably mounted on the upper end of the fixing plate through a support second and locks against the vertical section of the corresponding L-shaped locking plate.

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