A quick-assembly and disassembly boiler pipe connection structure

Abstract

This utility model provides a quick-assembly and disassembly boiler pipe connection structure, including pipe A and pipe B with identical structures. One end of pipe A is fixedly mounted with a flange, and the other end is the mating end. The mating end of both pipes is inserted into the flanged end of the other pipe, and a conical sealing sleeve is installed by threads. The outer surface of the conical sealing sleeve is in close contact with the inner wall of the sealing outer sleeve, and a sealing gasket is provided between them. The sealing disc, on which the sealing outer sleeve is fixedly mounted, is connected to the flange by bolts. This utility model uses bolts away from high-temperature areas and is equipped with anti-loosening gaskets, allowing for quick assembly and disassembly and improving efficiency. The conical sealing sleeve tightens with increasing pressure, and together with the sealing gasket, it can withstand high pressure of 0.6-2.5MPa and high temperature below 400℃, and can automatically align, making it suitable for medium and low-pressure boilers and other applications.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipeline connection structure, and in particular relates to a boiler pipeline connection structure that can be quickly disassembled and assembled. Background Technology

[0002] In industrial boiler systems, the reliability and efficiency of pipe connections directly affect the operational safety and maintenance convenience of the equipment. Currently, traditional boiler pipe connection methods mainly include flange welding, threaded connections, and socket welding, but these methods have significant limitations in practical applications.

[0003] To improve the speed of pipeline assembly and disassembly, existing technologies commonly employ flange welding connections, which achieve pipeline sealing through bolt tightening on the flange. However, in this type of connection, the bolts are distributed within the vertical outer circumference of the sealing area, meaning the bolts are close to the sealing surface where the medium flows. Since boiler pipelines primarily transport high-temperature steam or hot water, water vapor condensation easily occurs in the sealing area, and the high-temperature environment accelerates metal oxidation. This results in the bolts being subjected to prolonged high-temperature baking and water vapor erosion, significantly increasing the probability of oxidation and corrosion. The mating surfaces of the bolts and nuts can become stuck due to corrosion, greatly increasing the resistance during subsequent assembly and disassembly. Often, a wrench is needed for forceful tightening, and in cases of severe corrosion, even an oxy-fuel cutting tool must be used to break the bolts to complete disassembly, severely impacting assembly and disassembly efficiency.

[0004] Socket welding is a permanent connection. Disassembly and assembly require cutting the pipe, which is not only inefficient but also causes irreversible damage to the pipe body, affecting its secondary use.

[0005] In addition, the medium transported by boiler pipelines is mostly high-temperature steam or hot water, with working pressure usually between 0.6-2.5MPa and temperature reaching over 400℃. The sealing performance of traditional connection structures often decreases as the pressure increases, making it difficult to meet the long-term stable operation requirements under high-pressure conditions.

[0006] Therefore, it is essential to invent a boiler pipe connection structure that allows for quick assembly and disassembly. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a quick-assembly and disassembly boiler pipe connection structure, including pipe A, pipe B, flange, butt joint, conical sealing sleeve, sealing outer sleeve, sealing gasket, and sealing disc. Pipe A and pipe B have the same structure, with a flange fixedly installed at one end and the butt joint at the other end. The butt joint of both pipes is inserted into the flanged end of the other pipe, and a conical sealing sleeve is installed by threads. The outer surface of the conical sealing sleeve is in close contact with the inner wall of the sealing outer sleeve, and a sealing gasket is provided between the two. The sealing disc, which is fixedly installed with the sealing outer sleeve, is connected to the flange by bolts.

[0008] Preferably, the two ends of the A pipe and the B pipe have different diameters, the diameter of the mating end is smaller than the diameter of the end with the flange, and the inner diameter of the end with the flange allows the mating end, the tapered sealing sleeve and the sealing outer sleeve to enter.

[0009] Preferably, the outer surface of the mating end is provided with threads that fit with the inner ring of the conical sealing sleeve. The conical sealing sleeve is a conical bushing structure, and the cone of the conical sealing sleeve faces the same direction as the medium transported by pipes A and B.

[0010] Preferably, the outer conical surface of the conical sealing sleeve is in close contact with the inner conical surface of the sealing outer sleeve, wherein the outer conical surface of the conical sealing sleeve is provided with a sealing gasket insertion groove, and the sealing gasket is a conical sleeve gasket structure.

[0011] Preferably, the side of the sealing outer sleeve is fixedly connected to the sealing disc, the inner diameter of the sealing disc is larger than the outer diameter of the sealing disc and smaller than the cone diameter of the conical sealing sleeve, and the cone surface of the conical sealing sleeve can be in close contact with the inner surface of the sealing disc.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The bolts of this novel structure are located away from the area directly impacted by high-temperature media, reducing the probability of corrosion. Combined with the anti-loosening gasket design, disassembly resistance is further reduced. Single-person operation can complete disassembly and assembly within 3 minutes, improving efficiency by more than 60% compared to traditional flange connections, significantly shortening downtime for boiler maintenance or pipeline modifications.

[0014] The conical sealing sleeve of this invention has its cone head facing the same direction as the medium flow. When the medium pressure increases, the pressure pushes the conical sealing sleeve towards the outer sealing sleeve, making its outer conical surface fit more tightly with the inner conical surface of the outer sealing sleeve, creating a self-tightening effect where "the higher the pressure, the more reliable the seal." Combined with the double sealing effect of the sealing gasket, it can effectively meet the transportation needs of media with high pressures of 0.6-2.5MPa and high temperatures below 400℃, solving the problem of easy leakage under high pressure in traditional connection structures.

[0015] This utility model features a conical sealing sleeve that automatically aligns with the conical surface of the outer sealing sleeve, compensating for slight coaxiality deviations during pipe installation and reducing the requirements for installation accuracy. This structure is suitable for steam pipes and hot water circulation pipes in medium and low-pressure boilers, and its advantages are particularly pronounced in temporary pipe connections or maintenance sections requiring frequent disassembly and reassembly. Attached Figure Description

[0016] Figure 1 This is a half-sectional structural diagram of the present invention.

[0017] Figure 2 This is a utility model Figure 1 A magnified schematic diagram of the structure at point A.

[0018] In the picture:

[0019] Pipe A 1, Pipe B 2, Flange 3, Butt joint 4, Conical sealing sleeve 5, Sealing outer sleeve 6, Sealing gasket 7, Sealing disc 8. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., 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 the present invention and for simplifying the description, and do not 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 the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 2 As shown:

[0023] This utility model provides a quick-assembly and disassembly boiler pipe connection structure, including pipe A 1, pipe B 2, flange 3, butt joint 4, conical sealing sleeve 5, sealing outer sleeve 6, sealing gasket 7, and sealing disc 8. Pipe A 1 and pipe B 2 have the same structure, with flange 3 fixedly installed at one end and the butt joint 4 at the other end. The butt joint 4 of both pipes is inserted into the end of the other pipe with flange 3, and conical sealing sleeve 5 is installed by threads. The outer surface of conical sealing sleeve 5 is in close contact with the inner wall of sealing outer sleeve 6, and sealing gasket 7 is provided between the two. The sealing disc 8, which is fixedly installed with sealing outer sleeve 6, is connected to flange 3 by bolts.

[0024] Furthermore, the two ends of pipe A (1) and pipe B (2) have different diameters, employing a variable diameter design. Specifically, the diameter of the butt joint 4 is smaller than the diameter of the end with flange 3. Taking a DN100 pipe as an example, the outer diameter of the butt joint 4 is 89mm, while the inner diameter of the end with flange 3 is 114mm. This inner diameter allows the butt joint 4, the conical sealing sleeve 5, and the sealing outer sleeve 6 to enter smoothly. Both pipe A (1) and pipe B (2) are made of 20G seamless steel pipe for high-pressure boilers. This material has excellent high-temperature and high-pressure resistance, suitable for transporting high-temperature and high-pressure media in boiler systems. Flange 3 is fixedly connected to the ends of pipes A (1) and B (2) with flange 3 by welding. The weld is a full-penetration bevel weld, followed by stress-relieving heat treatment to ensure the connection strength and sealing meet the safety requirements for boiler operation.

[0025] Furthermore, the outer surface of the mating end 4 is provided with threads that mate with the inner ring of the conical sealing sleeve 5. These threads are fine-pitch threads with a pitch of 2mm and a thread precision of 6g, ensuring a tight connection between the conical sealing sleeve 5 and the mating end 4. The conical sealing sleeve 5 is made of 45# steel through forging and machining, and has an overall conical bushing structure with a taper of 1:12. The cone of the conical sealing sleeve 5 faces the same direction as the medium flowing through pipes A1 and B2; that is, when the medium flows from pipe A1 to pipe B2, the cone of the conical sealing sleeve 5 faces the side of pipe B2. This design allows the medium pressure to act on the rear end face of the conical sealing sleeve 5, pushing the conical sealing sleeve 5 towards the sealing outer sleeve 6, thereby enhancing the sealing effect between the two.

[0026] Furthermore, the outer conical surface of the conical sealing sleeve 5 and the inner conical surface of the sealing outer sleeve 6 are precision machined, with a surface roughness of Ra1.6μm, ensuring tight contact between the two. Specifically, the outer conical surface of the conical sealing sleeve 5 has two axially arranged sealing gasket 7 insertion grooves. The grooves have a rectangular cross-section, a depth of 2.5mm, and a width of 4mm. The sealing gasket 7 is made of fluororubber and is a conical sleeve gasket structure that matches the insertion grooves. Fluororubber has excellent high-temperature resistance, oil resistance, and chemical corrosion resistance. The sealing gasket 7 is installed in the insertion grooves, and its outer surface is slightly higher than the outer conical surface of the conical sealing sleeve 5. When the conical sealing sleeve 5 and the sealing outer sleeve 6 mate, the sealing gasket 7 is compressed and undergoes elastic deformation, effectively filling the gap between them and forming a reliable seal.

[0027] Furthermore, the sealing outer sleeve 6 is made of Q345R low-alloy high-strength structural steel. Its side is fixedly connected to the sealing disc 8 by welding. The weld is a fillet weld with a weld leg height of 8mm to ensure a firm connection. The sealing disc 8 is made of Q235A carbon structural steel. Its inner ring diameter is 95mm, which is larger than the outer diameter of the mating end 4 (89mm) and smaller than the cone head diameter of the conical sealing sleeve 5 (105mm). When the conical sealing sleeve 5 is installed in place, the cone head surface of the conical sealing sleeve 5 can make close contact with the inner surface of the sealing disc 8, which not only provides axial restraint for the conical sealing sleeve 5 but also further enhances the sealing effect. Six bolt holes are evenly distributed on the sealing disc 8 for bolt connection with the flange 3 to fix the entire connection structure.

[0028] The working principle is as follows: First, check the condition of each component before installation to ensure that there are no foreign objects on the surface of the mating end 4 of pipe A 1 and pipe B 2 and inside the end of flange 3, and that the sealing gasket 7 is intact and correctly embedded in the mounting groove of the conical sealing sleeve 5.

[0029] Next, the sealing outer sleeve 6 carried by the sealing disc 8 is pre-fitted onto the outside of the mating end 4 of pipe A 1, so that the opening of the sealing outer sleeve 6 faces the end of pipe A 1 with the flange 3.

[0030] Then, the conical sealing sleeve 5 is screwed into the outer surface thread of the mating end 4 of pipe A 1 through the inner ring thread, and the conical sealing sleeve 5 is tightened to complete the fixing of the conical sealing sleeve 5 on the mating end 4 of pipe A 1.

[0031] Subsequently, the mating end 4 of pipe A 1 with the conical sealing sleeve 5 is aligned with the end of pipe B 2 with the flange 3, and axially inserted into the end, so that the conical sealing sleeve 5 penetrates into the end first, until the mating end 4 of pipe A 1 is inserted to the preset depth. The sealing disc 8 and the sealing outer sleeve 6, which are sleeved on the outside of the mating end 4 of pipe A 1, are pushed to move axially along the mating end 4 and enter the end of pipe B 2 with the flange 3. At this time, the inner conical surface of the sealing outer sleeve 6 and the outer conical surface of the conical sealing sleeve 5 gradually come into contact and fit together, and the sealing gasket 7 begins to produce elastic deformation under the compression of the two.

[0032] After the outer sealing sleeve 6 is in complete contact with the conical surface of the conical sealing sleeve 5, align the bolt holes on the sealing disc 8 with the bolt holes on the flange 3 of pipe B, insert the bolts and tighten them gradually. As the bolts tighten, the sealing disc 8 moves the outer sealing sleeve 6 toward the flange 3, making the inner conical surface of the outer sealing sleeve 6 fit more and more tightly with the outer conical surface of the conical sealing sleeve 5. The sealing gasket 7 is fully compressed, filling the gap between the two and forming an initial seal.

[0033] Later, when the medium is transported in the pipeline, the medium pressure acts on the rear end of the conical sealing sleeve 5, pushing it to press further towards the outer sealing sleeve 6, so that the contact pressure between the two conical surfaces increases with the increase of the medium pressure, and the sealing effect of the sealing gasket 7 is enhanced simultaneously, realizing pressure self-tightening sealing and ensuring the sealing of the connection.

[0034] Finally, during disassembly, loosen the bolts connecting the sealing disc 8 and the flange 3, pull the sealing disc 8 and the outer sealing sleeve 6 axially along the mating end 4 to separate the outer sealing sleeve 6 from the conical sealing sleeve 5, then rotate the conical sealing sleeve 5 in the opposite direction to disengage it from the threads of the mating end 4, and finally pull the mating end 4 out of the end of the flange 3 to complete the disassembly of the pipeline.

[0035] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A quick-assembly and disassembly boiler pipe connection structure, characterized in that, The system includes pipe A (1), pipe B (2), flange (3), mating end (4), conical sealing sleeve (5), sealing outer sleeve (6), sealing gasket (7), and sealing disc (8). Pipe A (1) and pipe B (2) have the same structure, with flange (3) fixedly installed at one end and mating end (4) at the other end. The mating end (4) of both pipes is inserted into the end of the other pipe with flange (3) and is fitted with conical sealing sleeve (5) by thread. The outer surface of conical sealing sleeve (5) is in close contact with the inner wall of sealing outer sleeve (6), and a sealing gasket (7) is provided between them. The sealing disc (8) with sealing outer sleeve (6) fixedly installed is connected to flange (3) by bolts.

2. The boiler pipe connection structure for quick assembly and disassembly as described in claim 1, characterized in that: The diameters of the two ends of the A pipe (1) and the B pipe (2) are different. The diameter of the mating end (4) is smaller than the diameter of the end with the flange (3). The inner diameter of the end with the flange (3) allows the mating end (4), the conical sealing sleeve (5) and the sealing outer sleeve (6) to enter.

3. The boiler pipe connection structure for quick assembly and disassembly as described in claim 2, characterized in that: The outer surface of the docking end (4) is provided with threads that fit into the inner ring of the conical sealing sleeve (5). The conical sealing sleeve (5) is a conical bushing structure, and the cone head of the conical sealing sleeve (5) faces the same direction as the medium transported by pipe A (1) and pipe B (2).

4. The boiler pipe connection structure for quick assembly and disassembly as described in claim 3, characterized in that: The outer conical surface of the conical sealing sleeve (5) is in close contact with the inner conical surface of the sealing outer sleeve (6), wherein the outer conical surface of the conical sealing sleeve (5) is provided with a sealing gasket (7) mounting groove, and the sealing gasket (7) is a conical sleeve gasket structure.

5. The boiler pipe connection structure for quick assembly and disassembly as described in claim 4, characterized in that: The side of the sealing outer sleeve (6) is fixedly connected to the sealing disc (8). The inner diameter of the sealing disc (8) is larger than the outer diameter of the sealing disc (8) and smaller than the cone diameter of the conical sealing sleeve (5). The cone surface of the conical sealing sleeve (5) can be in close contact with the inner surface of the sealing disc (8).

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