Sleeve type compensator with double-sealing structure

Abstract

The utility model discloses a sleeve type compensator with a double sealing structure, which relates to the technical field of heat supply pipeline protection, comprises a core pipe, a protective sleeve and a first sealing structure, and is characterized in that a set of second sealing structure is additionally arranged on the outer side of the first sealing structure along the axial direction of the core pipe; the second sealing structure comprises a leaking stoppage pressing sleeve which is detachably fixed to the protective sleeve and wraps the core pipe. The graphite nickel wire packing is accommodated in the leaking stoppage pressing sleeve and is pressed by the leaking stoppage pressing sleeve so as to form sliding seal with the core pipe; the sealant pouring cavity is formed among the leaking stoppage pressing sleeve, the core pipe and the protective sleeve pipe; and the cock is communicated with the sealant pouring cavity. By additionally arranging the second sealing structure capable of being installed on line, under-pressure repairing of the leakage compensator is achieved, the double-sealing mode of mechanical pressing and glue injection filling is adopted, the leakage stopping reliability is high, and the original displacement compensation function of the compensator is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of heating pipeline protection, in particular to a sleeve-type compensator with a double sealing structure. Background Art

[0002] Heating pipelines expand and contract due to temperature fluctuations in the medium they transport. To eliminate the resulting internal stress and prevent damage, sleeve compensators are often installed on these pipelines. Sleeve compensators primarily consist of a core tube and a sheath tube that slide relative to each other. Their sealing performance relies primarily on the sealing filler placed between them.

[0003] After long-term operation, the sealing filler will gradually fail due to aging, wear, or eccentricity between the core tube and the sheath tube, resulting in leakage of high-temperature and high-pressure media in the pipeline. Once a leak occurs, it will not only cause energy waste, but also threaten the safety of surrounding facilities and personnel. At present, the main way to deal with such leakage accidents is to replace the entire compensator, which must be based on the shutdown of the thermal network and involves a series of complex processes such as ground excavation, removal of old parts and installation of new parts. This method not only leads to interruption of heating supply and affects people's livelihood, but also has very high maintenance and time costs. Therefore, this field urgently needs a technical solution that can quickly and reliably repair a leaking sleeve compensator without interrupting the heat supply. Utility Model Content

[0004] The utility model provides a sleeve compensator with a double sealing structure, which can solve the above problems.

[0005] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] A sleeve-type compensator with a double sealing structure includes a core tube, a sheath tube sleeved outside the core tube, and a first sealing structure and a second sealing structure for sealing the assembly gap between the core tube and the sheath tube. The second sealing structure is arranged outside the first sealing structure along the axial direction of the core tube. The second sealing structure includes:

[0007] A leak-proof compression sleeve, which is detachably fixed to the sheath tube and covers the core tube;

[0008] Graphite nickel wire packing, accommodated in the plugging sleeve and compressed by the sleeve to form a sliding seal with the outer wall of the core tube;

[0009] A sealant injection cavity is formed between the plugging sleeve, the core tube and the sheath tube; and a cock is arranged on the plugging sleeve and communicated with the sealant injection cavity.

[0010] Preferably, the leak-proof pressure sleeve is composed of at least two sleeve body components that can be spliced ​​together along the radial direction of the core tube.

[0011] Preferably, the leak-proof compression sleeve is composed of two semi-annular compression sleeves connected by bolts.

[0012] Preferably, a full-ring flange is fixed to the outer wall of the sheath pipe; and the leak-proof sleeve is detachably connected to the full-ring flange by means of docking bolts.

[0013] Preferably, each of the semi-annular compression sleeves is provided with a semi-annular flange, and the semi-annular flange is butted against the full-annular flange.

[0014] Preferably, the inner wall of the leak-proof compression sleeve is provided with an annular compression groove for accommodating the graphite nickel wire packing.

[0015] Preferably, the first sealing structure includes a sealing filler disposed in the sheath tube and a filler pressing plate for compressing the sealing filler.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) By adding a detachable second sealing structure on the outside (axially) of the original compensator sealing structure, the leakage point is sealed online under pressure; its core component, the leak-proof pressure sleeve, adopts a radially spliced ​​split structure, which can be quickly installed without cutting or disassembling the pipeline. The entire repair process can be completed without interrupting the heat supply, fundamentally avoiding the huge economic losses and social impact caused by the shutdown of the pipeline network due to traditional maintenance methods.

[0018] (2) The second sealing structure innovatively combines two sealing mechanisms: first, by compressing the graphite nickel wire packing, a flexible mechanical seal is formed; second, by injecting the sealing glue into the sealant injection cavity under high pressure through the cock, all potential tiny leakage channels are filled and solidified to form a chemical seal. This dual sealing method of "mechanical compression" and "glue filling" complements each other and greatly improves the success rate of leak plugging and the reliability of long-term operation.

[0019] (3) The graphite nickel wire packing, the main sliding seal in the second sealing structure, has excellent self-lubrication. After being compressed, it can not only achieve sealing but also allow the core tube to slide freely inside it, thus ensuring that the original axial displacement compensation function of the compensator is not affected in any way. Its split-type, flange-jointed installation method has a simple structure and convenient operation. It is particularly suitable for small and complex working spaces such as wells and has strong adaptability to on-site construction.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following embodiments of the present invention are given in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the utility model when only the first sealing structure is used;

[0023] Figure 2 This is a schematic diagram of the structure of the utility model when the first and second sealing structures are used;

[0024] Figure 3 This is a schematic cross-sectional view of the utility model when the first and second sealing structures are used;

[0025] Figure 4 It is a structural schematic diagram of the semi-annular pressing sleeve in the utility model.

[0026] In the figure: 1-core tube, 2-packing pressure plate, 3-sealing packing, 4-sheath tube, 5-pressing sleeve tightening bolt, 6-graphite nickel wire packing, 7-leakage plugging sleeve, 8-cock, 9-butt bolt, 10-half ring flange, 11-connecting plate, 12-pressing groove, 13-axial compensation cavity, 14-full ring flange, 15-sealant injection cavity. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0028] See also Figures 1 to 4 The present invention provides a sleeve-type compensator with a double-sealed structure. The compensator comprises a core tube 1 and a sheath tube 4 sleeved on the outside of the core tube 1. A portion of the core tube 1 can slide axially within the sheath tube 4 to compensate for the thermal expansion and contraction of the pipeline.

[0029] The sheath tube 4 is provided with a conventional first-level sealing structure, such as Figure 3As shown, the primary sealing structure can include a sealing packing 3 disposed within the axial compensation cavity 13 between the jacket tube 4 and the core tube 1, and a packing pressure plate 2 for compressing the sealing packing 3. This primary sealing structure is an inherent sealing device of the compensator and may leak after long-term operation due to aging, wear, and other factors. The technical solution of the present utility model is designed to address this leakage problem.

[0030] The core innovation of this utility model is that Figure 2 and Figure 3 As shown, a second sealing structure is added to the outside of the first sealing structure along the axial direction of the core tube 1. The second sealing structure can be installed when the compensator is under pressure to achieve online sealing of leakage.

[0031] Specifically, the second sealing structure includes a plugging sleeve 7, a graphite nickel wire packing 6 and a cock 8 for injecting sealant.

[0032] The leak-proof pressure sleeve 7 is the main body of the second-level sealing structure, and its function is to accommodate and compress the seal and form a glue injection cavity. In order to achieve online installation, the leak-proof pressure sleeve 7 preferably adopts a split structure, that is, it is composed of at least two sleeve components that can be spliced ​​together along the radial direction of the core tube 1. In this embodiment, it is composed of two symmetrical semi-annular pressure sleeves. The two semi-annular pressure sleeves can be fastened and connected by the connecting plates 11 on both sides and the pressure sleeve tightening bolts 5, thereby splicing into a complete annular pressure sleeve. The structure of a single semi-annular pressure sleeve is as shown in FIG. Figure 4 shown.

[0033] To securely secure the leak-proof gland 7 to the jacket tube 4, a full-ring flange 14 is fixed to the outer wall of the jacket tube 4. Accordingly, each semi-annular gland is integrally formed with a half-ring flange 10. When the two semi-annular glands are joined, the two half-ring flanges 10 form a complete mating flange. By inserting several mating bolts 9 through the bolt holes in the mating flange and the full-ring flange 14, the entire leak-proof gland 7 is removably and securely secured to the jacket tube 4.

[0034] Inside the sealing sleeve 7, a graphite nickel wire packing 6 is installed for initial sealing. To better accommodate and position the graphite nickel wire packing 6, the inner wall of the sealing sleeve 7 is preferably machined with an annular pressure groove 12. During installation, the graphite nickel wire packing 6 is placed in this pressure groove 12. When the sealing sleeve 7 is tightened to the sheath tube 4, the graphite nickel wire packing 6 is compressed axially and radially, making it fit tightly against the outer wall of the core tube 1, forming a self-lubricating sliding seal.

[0035] Between the sealing sleeve 7, the core tube 1, and the sheath tube 4, the area enclosed by the graphite nickel wire packing 6 naturally forms an annular sealant injection cavity 15. At least one cock 8 is provided on the wall of the sealing sleeve 7, and the channel of the cock 8 is connected to the sealant injection cavity 15.

[0036] The working process of the utility model is as follows: when the first sealing structure leaks, the maintenance personnel do not need to shut down the pipeline network. First, the graphite nickel wire packing 6 is wrapped around the outside of the leaking part of the core tube 1. Then, two semi-annular plugging sleeves 7 are wrapped around the core tube 1 and the graphite nickel wire packing 6 from both sides, and they are spliced ​​with the sleeve compression bolts 5. Next, the assembled plugging sleeve 7 is pushed toward the sheath tube 4 so that its docking flange is aligned with the full ring flange 14, and is evenly tightened with the docking bolts 9. This process will compress the graphite nickel wire packing 6 to form a preliminary mechanical seal. Finally, the cock 8 is connected through a high-pressure glue injection gun, and high-temperature plugging sealant is injected into the sealant injection cavity 15 until the cavity is completely filled and there is no leakage outside. After the sealant solidifies, it forms a strong and reliable double seal together with the graphite nickel wire packing 6, thereby completing the online pressure repair.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sleeve-type compensator with a double sealing structure, comprising a core tube (1), a sheath tube (4) sleeved outside the core tube (1), and a first sealing structure for sealing an assembly gap between the core tube (1) and the sheath tube (4), characterized in that: It also includes a second resealing structure, which is arranged on the outside of the first resealing structure along the axial direction of the core tube (1), and the second resealing structure includes: A leak-proof pressure sleeve (7) which is detachably fixed to the sheath tube (4) and covers the core tube (1); Graphite nickel wire packing (6), accommodated in the plugging sleeve (7) and compressed by the plugging sleeve to form a sliding seal with the outer wall of the core tube (1); A sealant injection cavity (15) is formed between the leak-proof pressure sleeve (7), the core tube (1) and the sheath tube (4); and a cock (8) is arranged on the leak-proof pressure sleeve (7) and communicated with the sealant injection cavity (15).

2. The sleeve compensator according to claim 1, characterized in that: The leak-proof pressure sleeve (7) is composed of at least two sleeve body components that can be spliced ​​together along the radial direction of the core tube (1).

3. The sleeve compensator according to claim 2, characterized in that: The leak-proof compression sleeve (7) is composed of two semi-annular compression sleeves connected by bolts.

4. The sleeve compensator according to claim 3, characterized in that: A full-ring flange (14) is fixed to the outer wall of the sheath pipe (4); the leak-proof pressure sleeve (7) is detachably connected to the full-ring flange (14) via docking bolts (9).

5. The sleeve compensator according to claim 4, characterized in that: Each of the semi-annular compression sleeves is provided with a semi-annular flange (10), and the semi-annular flange (10) is butted against the full-annular flange (14).

6. The sleeve compensator according to claim 1, characterized in that: The inner wall of the leak-proof pressure sleeve (7) is provided with an annular pressure groove (12) for accommodating the graphite nickel wire packing (6).

7. The sleeve compensator according to claim 1, characterized in that: The first sealing structure comprises a sealing filler (3) arranged in the sheath tube (4) and a filler pressing plate (2) for pressing the sealing filler (3).

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