Insulated pipe connection sealing structure

Abstract

The utility model discloses a heat preservation pipeline connecting sealing structure relates to pipeline engineering technical field. Including center work steel pipe, as the main part of conveying medium, heat preservation layer, the interface end of PE outer protection pipe for protecting heat preservation layer and being sleeved on the surface of heat preservation layer adopts hot melt sleeve connection, soft rubber tube, is sleeved in the outside of hot melt sleeve, prefabricated glass steel pipe, is sleeved in the outside of soft rubber tube and provides mechanical protection. The utility model adopts hot melt sleeve welding, soft rubber tube glass seal, stainless steel clamp fastening's first class sealing system, and the adhesion of soft rubber tube inner wall dense water line can be strengthened with PE outer protection pipe, and glass seal can fill the gap fully, and cooperate the secondary sealing of prefabricated glass steel pipe outside resin putty, forms double protection barrier.

Description

Technical Field

[0001] This utility model relates to the field of pipeline engineering technology, specifically to a sealing structure for insulated pipeline connections. Background Technology

[0002] In insulated pipeline systems for heating, oil transportation, etc., PE outer protective pipes are often connected by hot-melt sleeve welding, but the traditional connection method has obvious defects:

[0003] 1. Insufficient waterproofing and incomplete heat fusion can easily lead to the intrusion of rainwater and groundwater, causing the insulation layer to become damp and increasing heat loss;

[0004] 2. Poor impact resistance; external impacts can easily damage the heat-fusion sleeve or crack the PE outer protective tube, accelerating seal failure.

[0005] 3. Limited lifespan, relying solely on heat-fused sleeves or a single patch layer, and susceptible to long-term environmental erosion, such as ultraviolet radiation and temperature changes, leading to easy aging and cracking.

[0006] Existing jointing technologies do not provide multiple layers of protection and are difficult to balance sealing, impact resistance, and ease of construction. Therefore, there is an urgent need for optimized connection solutions. To address this, this utility model proposes a novel solution to improve the above-mentioned problems. Utility Model Content

[0007] The purpose of this utility model is to provide a sealing structure for the connection of insulated pipes. This structure, through multi-layer protection design and specific construction steps, solves the problems of insufficient waterproofing, poor impact resistance, and limited lifespan of traditional PE outer protective pipe hot-melt connection, and achieves efficient sealing and long-term protection of the connection parts of insulated pipes, which has strong practicality.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for insulated pipe connections, comprising:

[0009] The central working steel pipe serves as the main body for conveying the medium;

[0010] The insulation layer is fitted onto the surface of the central working steel pipe;

[0011] PE outer protective pipe; used to protect the insulation layer and sleeved on the surface of the insulation layer; the interface ends of the PE outer protective pipe are connected by heat fusion sleeve.

[0012] Flexible tubing, fitted over the outside of the heat-fusion sleeve;

[0013] Precast fiberglass pipes are fitted over the outside of flexible rubber tubing to provide mechanical protection.

[0014] Furthermore, the inner wall of the flexible tube is provided with dense water lines, which can enhance the fit with the PE outer protective tube. The annular gaps at both ends of the flexible tube in contact with the PE outer protective tube are fully filled and sealed with glass glue. Stainless steel clamps are also used on the outer sides of both ends of the flexible tube to ensure a tight connection with the PE outer protective tube.

[0015] Further, the connecting end of the central working steel pipe is exposed outside the insulation layer for a certain distance, and the partition at the connecting end of the central working steel pipe is filled with the same material as the insulation layer for sealing.

[0016] Furthermore, a water blocker is installed inside the insulation layer, and the water blocker is located near the connection end of the central working steel pipe.

[0017] Further, the inner sides of both ends of the precast fiberglass pipe are coated with putty and covered with mesh cloth, and then putty is applied to the outer side to form a joint filler. The addition of mesh cloth enhances the toughness of the joint filler, prevents cracking, and ensures strong overall structural stability. This reduces the frequency of later maintenance, lowers operation and maintenance costs, and extends the service life of the pipeline.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] The insulated pipe connection sealing structure adopts a primary sealing system consisting of hot-melt sleeve welding, soft rubber hose glass glue sealing, and stainless steel clamp fastening. The dense water lines on the inner wall of the soft rubber hose can enhance the fit with the PE outer protective pipe, and the glass glue can fully fill the gaps. Combined with the secondary sealing of the resin putty on the outside of the prefabricated fiberglass pipe, a double protective barrier is formed.

[0020] Meanwhile, by pre-inserting precast fiberglass pipes and soft rubber hoses and reserving sliding space during construction, the hot-melt operation area can be avoided. The process design has high adaptability, which is not only convenient for connecting new pipelines, but also meets the needs of old pipeline renovation. The precast fiberglass pipes can provide reliable mechanical protection for the connection parts and resist external impacts. The addition of mesh cloth enhances the toughness of the joint putty and prevents cracking. The overall structure has strong stability, which can reduce the frequency of later maintenance, reduce operation and maintenance costs, and extend the service life of the pipeline. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0022] In the diagram: 1. Central working steel pipe; 2. Insulation layer; 3. Water barrier; 4. PE outer protective pipe; 5. Hot melt sleeve; 6. Flexible rubber hose; 7. Stainless steel clamp; 8. Precast fiberglass pipe; 9. Joint filler. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1 As shown, this utility model provides a technical solution: a sealing structure for connecting insulated pipes, comprising:

[0025] The central working steel pipe 1 serves as the main body for conveying the medium;

[0026] PE outer protective pipe 4 is used to protect the insulation layer 2. The two sections of PE outer protective pipe 4 are sealed and welded by hot melt sleeve 5.

[0027] A flexible tubing is fitted over the outside of the heat-melting sleeve 5. The inner wall is provided with dense water lines (to enhance adhesion and waterproofing). The inner sides of both ends are sealed with glass glue, and the outer sides are fastened with stainless steel clamps 7.

[0028] Precast fiberglass pipe 8 is fitted over the outer side of the flexible rubber pipe to provide mechanical protection. Both ends are sealed with joint filler 9 formed by resin putty and mesh cloth. A water barrier 3 is installed between the PE outer protective pipe 4 and the insulation layer 2 to further enhance the water-blocking effect. If the pipeline is buried at a great depth or there is abundant groundwater, a water barrier 3 can be installed between the PE outer protective pipe 4 and the insulation layer 2 to further prevent water penetration.

[0029] During construction, pre-fitting components are required. Before welding the PE outer protective pipe 4, the prefabricated fiberglass pipe 8 and the flexible hose are respectively fitted onto the two pipe sections to be connected, ensuring they are positioned away from the hot-melt area and can slide freely. Then, the connection ends of the PE outer protective pipe 4 are hot-melted, the hot-melt sleeve 5 is installed and heated to fuse, and the insulation layer 2 outside the central working steel pipe 1 is simultaneously restored, such as by adding polyurethane foam. The flexible hose is then slid directly above the hot-melt sleeve 5, completely covering it. Silicone sealant is applied to the inner sides of both ends of the flexible hose 6 (the annular gaps in contact with the PE outer protective pipe 4), and immediately tightened with stainless steel clamps 7 to ensure the flexible hose... Pipe 6 is tightly fitted to the PE outer protective pipe 4. After tightening, ensure that the soft rubber pipe 6 and the PE outer protective pipe 4 are tightly fitted, and ensure that the glass glue is fully filled in the gap. The glass glue fills the gap to form a primary seal. Slide the precast fiberglass pipe 8 to the outside of the soft rubber pipe to completely cover the soft rubber pipe. Cut the fiberglass mesh cloth and prepare the resin putty. First, apply putty and attach the mesh cloth to the inside of both ends of the precast fiberglass pipe 8, and then apply putty to the outside. The resin putty is applied in two layers. First, attach the mesh cloth to enhance toughness, and then cover the surface to ensure the curing effect, forming a tight sealing layer of joint putty 9, forming a secondary seal plus mechanical protection effect.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A sealing structure for insulated pipe connections, characterized in that, include: The central working steel pipe (1) serves as the main body for conveying the medium; Insulation layer (2) is fitted onto the surface of the central working steel pipe (1); PE outer protective pipe (4); used to protect the insulation layer (2) and sleeved on the surface of the insulation layer (2), the interface end of the PE outer protective pipe (4) is connected by a heat fusion sleeve (5); A flexible rubber tube (6) is fitted over the outside of the heat-fusion sleeve (5); A precast fiberglass pipe (8) is fitted over the outside of the soft rubber pipe (6) to provide mechanical protection.

2. The insulated pipe connection sealing structure according to claim 1, characterized in that: The inner wall of the soft rubber tube (6) is provided with dense water lines, and the annular gaps at both ends of the soft rubber tube (6) in contact with the PE outer protective tube (4) are fully filled and sealed with glass glue. The outer sides of both ends of the soft rubber tube (6) are also tightly connected to the PE outer protective tube (4) by stainless steel clamps (7).

3. The insulated pipe connection sealing structure according to claim 1, characterized in that: The connection end of the central working steel pipe (1) is exposed outside the insulation layer (2) for a certain distance. The partition at the connection end of the central working steel pipe (1) is filled with the same material as the insulation layer (2) for sealing.

4. The insulated pipe connection sealing structure according to claim 1, characterized in that: A water blocker (3) is provided inside the insulation layer (2), and the water blocker (3) is located at the connection end near the central working steel pipe (1).

5. The insulated pipe connection sealing structure according to claim 1, characterized in that: The inner sides of both ends of the precast fiberglass pipe (8) are coated with putty and covered with mesh cloth, and then putty is applied to the outer side to form a joint filler putty (9).

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