High-temperature-resistant boiler pipe sealing connector

Abstract

The utility model provides a kind of high-temperature-resistant boiler pipe sealing connector, including first joint pipe and second joint pipe, its end part is equipped with first convex ring and second convex ring respectively, and the butt joint is realized between two convex rings by connecting assembly. Connecting assembly includes the bellows inserted into two pipes and the first sealing ring and the second sealing ring arranged on its both sides, realize flexible connection and double sealing. The connecting flange is sleeved in the middle of first joint pipe, and the connecting seat is embedded between it and first convex ring, and the connecting seat and connecting flange are fixed by multiple circumferentially distributed bolts, forming stable support structure. Snap ring is clamped on second convex ring, cooperates with the external thread of the outer periphery of connecting seat, realizes thread locking, and the two joint pipe is axially compressed. Heat preservation assembly is provided in the cavity surrounded by first convex ring, second convex ring, connecting assembly, connecting seat and snap ring, to realize efficient heat insulation. The connector is compact in structure, with excellent sealing, high-temperature resistance and dismountability.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler tube connectors, and in particular to a high-temperature resistant boiler tube sealing connector. Background Technology

[0002] In boiler systems operating under high temperature and high pressure, the sealing performance and thermal stability of pipe connections directly affect the system's safety and energy efficiency. Traditional boiler tube connections often employ welding or simple flange connections, which suffer from inconvenient assembly and disassembly, difficulty in adapting to thermal expansion and contraction, and susceptibility to stress concentration and seal failure. Especially under conditions of frequent start-ups and shutdowns or large temperature fluctuations, the connection structure is prone to leakage or loosening due to thermal fatigue. Furthermore, the lack of effective insulation in the connection area leads to significant heat loss, reducing thermal efficiency and increasing the heat load on external components. Therefore, there is an urgent need for a boiler tube sealing connector that can ensure reliable sealing at high temperatures while also possessing good thermal insulation performance and structural stability to meet the demands of modern industry for efficient, safe, and maintainable piping systems. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a high-temperature resistant boiler tube sealing connector to solve the problem of poor sealing reliability of the connector at high temperatures in the prior art.

[0004] To achieve the above and other related objectives, this utility model provides the following technical solution:

[0005] A high-temperature resistant boiler tube sealing connector includes a first connector tube and a second connector tube. The first connector tube has a first convex ring at its end, and the second connector tube has a second convex ring on the opposite side of the first convex ring. A connecting assembly is provided between the first connector tube and the second connector tube. A connecting flange is fitted in the middle of the first connector tube. A connecting seat located on the outer periphery of the connecting assembly is embedded between the connecting flange and the first convex ring. A retaining ring connected to the outer periphery of the connecting seat is clamped on the second convex ring. A heat insulation assembly is provided between the cavity formed by the first convex ring, the second convex ring, the connecting assembly, and the connecting seat.

[0006] To achieve the above technical solution, the first convex ring on the first connector pipe and the second convex ring on the second connector pipe are arranged opposite each other, forming a symmetrical pressure-bearing and limiting structure, effectively resisting the axial pressure and thermal expansion stress inside the pipeline. The connecting seat is sleeved on the first connector pipe and fixedly connected to the connecting flange, forming a stable support base; the retaining ring is snapped onto the second convex ring and forms a tight fit with the outer circumference of the connecting seat, thereby tightly locking the two connector pipes radially and axially. The connecting assembly is located at the joint of the two pipes, undertaking the initial alignment and connection functions. The closed cavity formed by the first convex ring, the second convex ring, the connecting assembly, the connecting seat, and the retaining ring is equipped with a heat insulation component, which not only improves the heat insulation performance of the connection area, but also reduces the heat conduction of the high-temperature medium to the metal connection structure, maintains the stability of the sealing interface, and the overall structure can still maintain good sealing and mechanical properties under high-temperature conditions.

[0007] In one embodiment of the present invention, the connecting assembly includes a bellows with both ends capable of being inserted into the first connector tube and the second connector tube, a first sealing ring disposed between the bellows and the first convex ring, and a second sealing ring disposed between the bellows and the second convex ring.

[0008] To achieve the above technical solution, the two ends of the bellows in the connecting assembly are inserted into the first and second connector pipes, respectively, to achieve a through connection between the two pipes. As a flexible connecting element, the bellows can adapt to minor displacements caused by thermal expansion and contraction or vibration of the pipeline, while maintaining structural continuity. A first sealing ring is positioned between the bellows and the first convex ring, and a second sealing ring is positioned between the bellows and the second convex ring, forming radial seals at the two interfaces to prevent high-temperature media from leaking from the connection gap between the bellows and the connector pipes. The three elements work synergistically, enabling the bellows to perform both connection and compensation functions, while also maintaining a reliable sealing interface in high-temperature environments through the double-sealing-ring structure, thus improving the overall stability and safety of the connection.

[0009] In one embodiment of the present invention, the heat insulation component includes a support ring located on the outer periphery of the first convex ring and the second convex ring, a closing ring located on the outer periphery of the support ring and with its two ends respectively abutting against the connecting seat and the retaining ring, and a heat insulation ring embedded between the closing ring and the support ring.

[0010] To achieve the above technical solution, the insulation component utilizes a synergistic structure of a support ring, a closing ring, and an insulation ring to achieve efficient thermal insulation. The support ring fits against the outer periphery of the first and second convex rings, serving a positioning and supporting function while providing an inner foundation for the insulation structure. The closing ring tightly confines the entire insulation component within the cavity of the connection point. The insulation ring is embedded between the support ring and the closing ring, acting as the primary insulation layer and effectively preventing high temperatures from being conducted outwards from the pipe connection.

[0011] In one embodiment of the present invention, the retaining ring includes a retaining portion that is engaged on the second protruding ring and a connecting portion located on the outer periphery of the connecting seat.

[0012] To achieve the above technical solution, the retaining ring consists of a retaining part and a connecting part, which together achieve radial locking and axial fixation of the connecting parts. The retaining part is embedded in the second protruding ring of the second connector tube to form a firm snap-fit, while the connecting part is sleeved on the outer periphery of the connecting seat to form a detachable connection with the connecting seat, thereby tightening and locking the first connector tube and the second connector tube through the interaction between the connecting seat and the retaining ring.

[0013] In one embodiment of this utility model, the connecting part is provided with an internal thread near the connecting flange, and the outer periphery of the connecting seat is provided with an external thread corresponding to the internal thread.

[0014] To achieve the above technical solution, the inner side of the connecting part of the retaining ring is provided with an internal thread, which forms a threaded engagement with the external thread provided on the outer circumference of the connecting seat. After the retaining ring is installed on the second convex ring through the locking part, its connecting part engages with the external thread of the connecting seat through the internal thread, realizing a helical lock between the two. During rotation, the connecting part moves axially along the connecting seat, gradually pressing the connecting part, while ensuring that the bellows and sealing ring are subjected to uniform force, forming a reliable sealing interface.

[0015] In one embodiment of this utility model, a plurality of bolts are provided between the connecting flange and the connecting seat.

[0016] To achieve the above technical solution, the connecting flange and the connecting seat are fastened together by a number of bolts. These bolts are evenly distributed circumferentially, passing through the corresponding mounting holes of the connecting flange and the connecting seat, and are firmly pressed together by applying a preload. This provides a mechanical basis for the subsequent installation and preloading of the retaining ring.

[0017] As described above, the high-temperature boiler tube sealing connector of this utility model has the following beneficial effects: Through the symmetrical limiting structure of the first and second convex rings, the flexible sealing connection assembly composed of the bellows and double sealing rings, and the multiple mechanical connection system consisting of the connecting seat, retaining ring, threaded locking, and bolt fixing, the strength, sealing performance, and thermal stress resistance of the connection are significantly improved. The coordinated design of the support ring, insulation ring, and sealing ring in the insulation assembly effectively blocks heat conduction outward, improving thermal efficiency and protecting the external structure. The overall connector has good disassembly and reusability, facilitating maintenance and repair. Attached Figure Description

[0018] Figure 1 The diagram shown is a structural schematic of this utility model.

[0019] Figure 2 The diagram shown is a structural schematic of a bellows.

[0020] Component designation explanation

[0021] 1. First connector pipe; 2. Second connector pipe; 3. First convex ring; 4. Second convex ring; 5. Connecting flange; 6. Connecting seat; 7. Snap ring; 8. Bellows; 9. First sealing ring; 10. Second sealing ring; 11. Support ring; 12. Closing ring; 13. Insulation ring; 71. Locking part; 72. Connecting part; 73. Internal thread; 61. External thread; 14. Bolt. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Please see Figures 1 to 2 This utility model provides a high-temperature resistant boiler tube sealing connector, including a first connector tube 1 and a second connector tube 2. The end of the first connector tube 1 is provided with a first convex ring 3, and the second connector tube 2 is provided with a second convex ring 4 on the opposite side of the first convex ring 3. A connecting assembly is provided between the first connector tube 1 and the second connector tube 2. A connecting flange 5 is sleeved in the middle of the first connector tube 1. A connecting seat 6 located on the outer periphery of the connecting assembly is embedded between the connecting flange 5 and the first convex ring 3. A retaining ring 7 connected to the outer periphery of the connecting seat 6 is clamped on the second convex ring 4. A heat insulation assembly is provided between the cavity formed by the first convex ring 3, the second convex ring 4, the connecting assembly and the connecting seat 6.

[0024] The first convex ring 3 on the first connector pipe 1 and the second convex ring 4 on the second connector pipe 2 are positioned opposite each other, forming a symmetrical pressure-bearing and limiting structure, effectively resisting the axial pressure and thermal expansion stress inside the pipe. The connecting seat 6 is sleeved on the first connector pipe 1 and fixedly connected to the connecting flange 5, forming a stable support base; the retaining ring 7 is snapped onto the second convex ring 4 and forms a tight fit with the outer periphery of the connecting seat 6, thereby tightly locking the two connector pipes in the radial and axial directions. The connecting assembly is located at the joint of the two pipes, undertaking the initial alignment and connection functions. The closed cavity formed by the first convex ring 3, the second convex ring 4, the connecting assembly, the connecting seat 6, and the retaining ring 7 is equipped with a heat insulation component, which not only improves the heat insulation performance of the connection area, but also reduces the heat conduction of the high-temperature medium to the metal connection structure, maintains the stability of the sealing interface, and the overall structure can still maintain good sealing and mechanical properties under high-temperature conditions.

[0025] The connecting assembly includes a bellows 8 with both ends insertable into the first connector pipe 1 and the second connector pipe 2, a first sealing ring 9 disposed between the bellows 8 and the first convex ring 3, and a second sealing ring 10 disposed between the bellows 8 and the second convex ring 4. The bellows 8 is inserted into the first connector pipe 1 and the second connector pipe 2 at both ends, achieving a through connection between the two pipes. As a flexible connecting element, the bellows 8 can adapt to minor displacements caused by thermal expansion and contraction or vibration of the pipeline, while maintaining structural continuity. The first sealing ring 9 is disposed between the bellows 8 and the first convex ring 3, and the second sealing ring 10 is disposed between the bellows 8 and the second convex ring 4, forming radial seals at the two interfaces to prevent high-temperature media from leaking from the connection gap between the bellows 8 and the connector pipe. The three elements work together to enable the bellows 8 to perform both connection and compensation functions, while maintaining a reliable sealing interface in high-temperature environments through the double sealing ring structure, thus improving the overall stability and safety of the connection.

[0026] The insulation component includes a support ring 11 located on the outer periphery of the first convex ring 3 and the second convex ring 4, a closing ring 12 located on the outer periphery of the support ring 11 with its two ends abutting against the connecting seat 6 and the retaining ring 7 respectively, and an insulation ring 13 embedded between the closing ring 12 and the support ring 11. The insulation component achieves efficient heat insulation through the synergistic structure of the support ring 11, the closing ring 12, and the insulation ring 13. The support ring 11 fits against the outer periphery of the first convex ring 3 and the second convex ring 4, serving a positioning and supporting function, while also providing an inner foundation for the insulation structure. The closing ring 12 tightly constrains the entire insulation component within the cavity at the connection point 72. The insulation ring 13 is embedded between the support ring 11 and the closing ring 12, serving as the main insulation layer and effectively preventing high temperature from being conducted outward from the pipe connection.

[0027] The retaining ring 7 includes a retaining part 71 that is engaged with the second protruding ring 4 and a connecting part 72 located on the outer periphery of the connecting seat 6. The retaining ring 7 is composed of the retaining part 71 and the connecting part 72, which together achieve radial locking and axial fixation of the connecting parts. The retaining part 71 is embedded in the second protruding ring 4 of the second connector tube 2 to form a firm snap-fit, while the connecting part 72 is sleeved on the outer periphery of the connecting seat 6 to form a detachable connection with the connecting seat 6, thereby tightening and locking the first connector tube 1 and the second connector tube 2 through the interaction between the connecting seat 6 and the retaining ring 7.

[0028] The connecting part 72 has an internal thread 73 near the connecting flange 5, and the outer periphery of the connecting seat 6 has an external thread 61 corresponding to the internal thread 73. The inner side of the connecting part 72 of the retaining ring 7 has an internal thread 73, which forms a threaded engagement with the external thread 61 on the outer periphery of the connecting seat 6. When the retaining ring 7 is installed on the second convex ring 4 through the locking part 71, its connecting part 72 engages with the external thread 61 of the connecting seat 6 through the internal thread 73, realizing a helical lock between the two. During rotation, the connecting part 72 moves axially along the connecting seat 6, gradually pressing the connecting part 72 in place, while ensuring that the bellows 8 and the sealing ring are subjected to uniform force, forming a reliable sealing interface.

[0029] A plurality of bolts 14 are provided between the connecting flange 5 and the connecting seat 6. The connecting flange 5 and the connecting seat 6 are fastened together by the plurality of bolts 14. These bolts 14 are evenly distributed circumferentially, pass through the corresponding mounting holes of the connecting flange 5 and the connecting seat 6, and are firmly pressed together by applying a preload. This provides a mechanical basis for the subsequent installation and preload of the retaining ring 7.

[0030] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A high-temperature resistant boiler tube sealing connector, comprising a first connector tube (1) and a second connector tube (2), characterized in that: The first connector tube (1) has a first protruding ring (3) at its end, and the second connector tube (2) has a second protruding ring (4) on the opposite side of the first protruding ring (3). A connecting assembly is provided between the first connector tube (1) and the second connector tube (2); A connecting flange (5) is fitted in the middle of the first connector pipe (1); A connecting seat (6) located on the outer periphery of the connecting assembly is embedded between the connecting flange (5) and the first convex ring (3); The second convex ring (4) is fitted with a retaining ring (7) that is connected to the outer periphery of the connecting seat (6); A heat insulation component is provided between the cavity formed by the first convex ring (3), the second convex ring (4), the connecting component and the connecting seat (6).

2. The high-temperature resistant boiler tube sealing connector according to claim 1, characterized in that: The connecting assembly includes a bellows (8) with both ends insertable into the first connector tube (1) and the second connector tube (2), a first sealing ring (9) disposed between the bellows (8) and the first convex ring (3), and a second sealing ring (10) disposed between the bellows (8) and the second convex ring (4).

3. The high-temperature resistant boiler tube sealing connector according to claim 1, characterized in that: The heat insulation component includes a support ring (11) located on the outer periphery of the first convex ring (3) and the second convex ring (4), a closing ring (12) located on the outer periphery of the support ring (11) and abutting the connecting seat (6) and the retaining ring (7) at both ends respectively, and a heat insulation ring (13) embedded between the closing ring (12) and the support ring (11).

4. The high-temperature resistant boiler tube sealing connector according to claim 1, characterized in that: The retaining ring (7) includes a retaining part (71) that is engaged on the second protruding ring (4) and a connecting part (72) located on the outer periphery of the connecting seat (6).

5. The high-temperature resistant boiler tube sealing connector according to claim 4, characterized in that: The connecting part (72) is provided with an internal thread (73) near the connecting flange (5), and the outer periphery of the connecting seat (6) is provided with an external thread (61) corresponding to the internal thread (73).

6. The high-temperature resistant boiler tube sealing connector according to claim 1, characterized in that: Several bolts (14) are provided between the connecting flange (5) and the connecting seat (6).

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