A heat-preservation tube wall-penetrating sealing structure

Abstract

The utility model relates to the technical field of thermal insulation pipe wall -penetrating sealing, disclose a kind of thermal insulation pipe wall -penetrating sealing structure, including shaft wall, the inner wall of the shaft wall is fixedly connected with wall -penetrating bushing, the inner wall of the wall -penetrating bushing is provided with thermal insulation pipeline, the inside fixedly connected with working core pipe of the thermal insulation pipeline, still include metal bellows assembly and metal outer shield, the metal bellows assembly includes metal bellows, one end of the metal bellows is fixedly connected with sealing ring plate, the other end of the metal bellows is fixedly connected with end pipe.The utility model is sealed by using metal bellows assembly as sealing element, installs shaft wall seal in situ on the outside of the shaft wall of original valve well and thermal insulation pipe, metal bellows has sealing function, when thermal insulation pipeline is displaced relative to shaft wall, it can be compressed (stretch).

Description

Technical Field

[0001] This utility model relates to the field of wall-penetrating sealing technology for insulated pipes, specifically, to a wall-penetrating sealing structure for insulated pipes. Background Technology

[0002] A wall-penetrating sealing structure for insulated pipes is a device used to achieve waterproofing, sealing, and insulation when pipes pass through walls. It typically consists of an inner pipe, a protective pipe, sealing filler, and a supporting structure. Its core function is to prevent groundwater from seeping in through pipe gaps while maintaining the pipe's insulation performance. It is commonly used in urban heating systems and in the wall-penetrating sections of industrial and civil buildings.

[0003] Because the valve wells or compensator inspection wells of old direct-buried insulated pipelines are not well sealed between the outer diameter of the insulated pipe and the well wall, groundwater will seep into the well when the groundwater level is high, which will damage the valves, compensators and other components in the well, reduce their service life and make inspection and maintenance inconvenient. Utility Model Content

[0004] The purpose of this utility model is to provide a wall-penetrating sealing structure for insulation pipes, which solves the problems of short service life and inconvenient inspection and maintenance of traditional sealing structures in the prior art.

[0005] This utility model provides the following technical solution: a wall-penetrating sealing structure for an insulated pipe, including a well wall, a wall-penetrating sleeve fixedly connected to the inner wall of the well wall, an insulated pipe provided on the inner wall of the wall-penetrating sleeve, a working core pipe fixedly connected inside the insulated pipe, and also including a metal corrugated pipe assembly and a metal outer protective cover. The metal corrugated pipe assembly includes a metal corrugated pipe, a sealing ring plate fixedly connected to one end of the metal corrugated pipe, and an end pipe fixedly connected to the other end of the metal corrugated pipe.

[0006] As a preferred embodiment of the above technical solution, a connecting ring plate is provided at the end of the end tube away from the metal bellows.

[0007] As a preferred embodiment of the above technical solution, the material of the metal corrugated pipe is 316L stainless steel.

[0008] As a preferred embodiment of the above technical solution, the sealing ring plate, the end tube, and the connecting ring plate are all made of Q235B material.

[0009] As a preferred embodiment of the above technical solution, the longitudinal weld of the metal bellows assembly is welded by automatic argon arc welding.

[0010] As a preferred embodiment of the above technical solution, the circumferential weld at the connection of the metal bellows assembly is welded by manual argon arc welding.

[0011] As a preferred embodiment of the above technical solution, the outer metal cover is disposed on the outside of the metal bellows assembly, and the outer metal cover is used to provide enveloping protection for the metal bellows assembly.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses a metal bellows assembly as a sealing element. A well wall seal is installed on-site on the outside of the original valve well wall and the insulation pipe. The metal bellows has a sealing function and can be compressed (stretched) when the insulation pipe is displaced relative to the well wall, thus maintaining a good sealing effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the metal bellows assembly and the metal outer protective cover of this utility model; Figure 2 This is a schematic diagram of the well wall structure of this utility model; Figure 3 This is a schematic diagram of the intact installation structure of the through-wall sleeve of this utility model; Figure 4 This is a schematic diagram of the installation structure for a damaged through-wall sleeve according to this utility model; Figure 5 This is a schematic diagram of the installation structure of the working core tube of this utility model without interruption.

[0014] In the diagram: 1. Well wall; 11. Through-wall sleeve; 12. Insulated pipe; 13. Working core pipe; 2. Metal corrugated pipe assembly; 21. Sealing ring plate; 22. Metal corrugated pipe; 23. End pipe; 24. Connecting ring plate; 3. Metal outer protective cover. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] like Figure 1 , Figure 2As shown, this utility model provides a technical solution: a wall-penetrating sealing structure for an insulated pipe, including a well wall 1, a wall-penetrating sleeve 11 fixedly connected to the inner wall of the well wall 1, an insulated pipe 12 provided on the inner wall of the wall-penetrating sleeve 11, a working core pipe 13 fixedly connected inside the insulated pipe 12, and also including a metal corrugated pipe assembly 2 and a metal outer protective cover 3. The metal corrugated pipe assembly 2 includes a metal corrugated pipe 22, a sealing ring plate 21 fixedly connected to one end of the metal corrugated pipe 22, and an end pipe 23 fixedly connected to the other end of the metal corrugated pipe 22. The metal corrugated pipe 22 is designed as a thin-walled multi-layer structure with sealing and compensation functions. The structural parameters of the metal corrugated pipe 22 are designed according to the displacement of the insulated pipe 12 relative to the well wall 1 (if it is a compensator well, the compensation amount is based on the compensator; for valve wells, since valve wells are generally located near fixed supports, the compensation amount will be very small, generally between 20 and 50 mm). The outer surface of the metal corrugated pipe 22 can be treated with anti-corrosion according to the corrosion intensity of the medium.

[0017] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, a connecting ring plate 24 is provided at the end of the end tube 23 that is away from the metal bellows 22.

[0018] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, the material of the metal corrugated pipe 22 is stainless steel 316L.

[0019] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, the sealing ring plate 21, the end tube 23 and the connecting ring plate 24 are all made of Q235B.

[0020] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, the longitudinal weld of the metal bellows assembly 2 is welded by automatic argon arc welding.

[0021] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, the circumferential weld at the connection of the metal bellows assembly 2 is welded by manual argon arc welding.

[0022] As one implementation method in this embodiment, such as Figure 1 , Figure 2 As shown, the outer metal cover 3 is disposed on the outside of the metal bellows assembly 2, and the outer metal cover 3 is used to provide enveloping protection for the metal bellows assembly 2.

[0023] like Figure 3As shown, the original well chamber has a through-wall sleeve 11 on the well wall 1, and the through-wall sleeve 11 is in good integrity. It can be welded to the well wall seal during installation, which can achieve a reliable seal between the well wall seal and the well wall 1. The metal bellows assembly 2 does not include the connecting ring plate 24. Specifically: First, disconnect the insulation pipe 12. Seal the sealing layer of the insulation pipe 12 with heat shrink end caps. Then, install the metal corrugated pipe assembly 2. Weld the metal corrugated pipe assembly 2 circumferentially to the wall sleeve 11 and the working core pipe 13 respectively. Then, weld the disconnected insulation pipe 12 butt-welded. Fill, wrap and bundle the disconnected insulation layer of the insulation pipe 12 with glass wool or aluminum silicate wool and glass wool cloth. Wrap the outside with waterproof tarpaulin and sealant for moisture protection. At this time, the metal corrugated pipe assembly 2 can be optionally equipped with a metal outer cover 3. That is, when installed in the well chamber, the metal outer cover 3 can be omitted, but when installed on the outside of the well wall 1, the metal outer cover 3 is essential.

[0024] like Figure 4 As shown, if there is no through-wall sleeve 11 on the original well wall 1, or if the existing through-wall sleeve 11 is severely corroded and the well wall seal cannot be welded to it, a flexible seal needs to be installed between the end face of the connecting ring plate 24 and the side of the well wall 1. This seal is achieved by tightening with expansion bolts. A prerequisite is that the side of the well wall 1 is flat and smooth, providing the conditions for installing the seal. Otherwise, further treatment is required. If the prerequisite is not met, this solution cannot be implemented. Specifically: First, ensure the opening width at the welding sealing ring plate 21 is ≥200mm. Cut open the outer sheath of the insulated pipe 12, clean the insulation layer, and seal both sides of the opening of the insulated pipe 12 with heat shrink tape. Clean the sides of the well wall 1. If the conditions for the upper sealing element are not met, adjustments are needed to ensure a smooth and flat surface. Drill holes in the well wall 1 according to the through hole positions of the connecting ring plate 24, install expansion joint bolts, and install two O-ring rubber seals between the well wall seal and the well wall 1. For ease of operation and to prevent the seals from shifting during installation, use adhesive to secure the seals. The sealing ring is fixed on the well wall 1, and the well wall seal is installed. The expansion bolts and nuts are tightened to compress the sealing ring and achieve a sealing effect. The circumferential weld between the well wall seal and the working core tube 13 is welded. The weld is free of defects such as pores, cracks, and scabs. If necessary, penetrant testing can be performed to ensure a reliable seal. The opening of the insulation pipe 12 is wrapped tightly with glass wool or aluminum silicate wool with glass wool cloth, and then covered with rainproof cloth and sealant to prevent moisture. It should be installed in the well room as much as possible. When installed in the well room, the metal outer cover 3 does not need to be installed. However, when installed outside the well room, the metal outer cover 3 must be installed.

[0025] like Figure 5As shown, for the insulated pipe 12 with a relatively large diameter and a valve well chamber, the relative axial displacement between the metal bellows 22 and the well wall 1 is very small, the corrugation of the metal bellows 22 is relatively large, and the wall thickness of the metal bellows 22 can be more than 1.0 mm. When installing the well wall seal, it is not necessary to disconnect the working core pipe 13. Instead, the metal bellows assembly 2 is cut along its center plane, and the two halves are sealed and welded along the cut during installation to achieve a reliable sealing effect. This installation method requires the following conditions: the pipe diameter cannot be too small, because a small pipe diameter results in a small corrugation pitch of the metal corrugated pipe 22, which is not conducive to on-site welding. The nominal diameter of the insulated pipe 12 should preferably be above DN300. It is only suitable for valve well chamber installation because valve well chambers are generally close to fixed supports. The axial displacement of the insulated pipe 12 relative to the well wall 1 is small, and the number of corrugations of the metal corrugated pipe 22 is reduced accordingly, which is conducive to on-site welding. Specifically: First, cut open the insulated pipe 12 and clean the opening. Simultaneously, clean the sides of the well wall 1. If the well wall 1 is not smooth enough, repair it until it is smooth and ready for sealing. Seal both sides of the opening of the insulated pipe 12 with heat-shrinkable tape. Drill expansion bolt holes in the well wall 1, aligning them with the holes in the connecting ring plate 24. Then install the sealing ring. For ease of installation, adhesive can be used to bond the sealing ring to the well wall 1. The sealing ring should have a circular cross-section to facilitate linear sealing and ensure reliable sealing performance. The sealing ring material should preferably be EPDM with good water repellency. Two or more layers are required to enhance sealing reliability. Install the metal bellows assembly 2, tighten the expansion bolts and nuts, and press the sealing ring to achieve a sealing effect. Weld the circumferential weld between the metal bellows assembly 2 and the working core tube 13. The weld should be free of defects such as pores, cracks, and scabs. Perform penetrant testing to ensure reliable sealing. Wrap the opening of the insulation pipe 12 tightly with glass wool or aluminum silicate wool using glass wool cloth, and then cover it with rainproof cloth and sealant for moisture protection. Install it in a well chamber if possible. If installed in a well chamber, the bellows assembly does not need to be installed with a metal outer cover 3, but if installed outside the well chamber, a metal outer cover 3 must be installed.

[0026] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A wall-penetrating sealing structure for an insulated pipe, comprising a well wall (1), wherein a wall-penetrating sleeve (11) is fixedly connected to the inner wall of the well wall (1), an insulated pipe (12) is provided on the inner wall of the wall-penetrating sleeve (11), and a working core pipe (13) is fixedly connected inside the insulated pipe (12), characterized in that: It also includes a metal bellows assembly (2) and a metal outer cover (3). The metal bellows assembly (2) includes a metal bellows (22), one end of which is fixedly connected to a sealing ring plate (21), and the other end of which is fixedly connected to an end pipe (23).

2. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 1, characterized in that: A connecting ring plate (24) is provided at the end of the end tube (23) away from the metal bellows (22).

3. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 1, characterized in that: The metal bellows (22) is made of stainless steel 316L.

4. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 2, characterized in that: The sealing ring plate (21), end tube (23) and connecting ring plate (24) are all made of Q235B.

5. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 1, characterized in that: The longitudinal weld of the metal bellows assembly (2) is welded by automatic argon arc welding.

6. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 1, characterized in that: The circumferential weld at the connection of the metal bellows assembly (2) is welded by manual argon arc welding.

7. The wall-penetrating sealing structure for a thermal insulation pipe according to claim 1, characterized in that: The outer metal cover (3) is disposed on the outside of the metal bellows assembly (2), and the outer metal cover (3) is used to provide enveloping protection for the metal bellows assembly (2).

Images