Heat tracing composite pipe capable of preventing bulging deformation

Abstract

The utility model provides a kind of heat tracing composite pipe capable of preventing expansion deformation, including inner tube, heat tracing band, insulating layer and outer sheath arranged in order from inside to outside, the inner tube is constituted by the series connection of multiple straight pipe sections and the corrugated pipe compensation section connected between straight pipe section;The outer wall of the straight pipe section is provided with helical groove, and the heat tracing band is embedded in the helical groove;The outside of the corrugated pipe compensation section is provided with rigid support ring that can slide axially relative thereto;The utility model relates to the technical field of heat tracing composite pipe, by the cooperation of corrugated pipe compensation section and rigid support ring, when straight pipe section is heated and elongated, stress concentration acts on corrugated pipe compensation section, so that it produces axial compression or stretching elastic deformation, effectively compensates the axial expansion caused by temperature change of inner tube, prevent pipe bending, deformation or damage.

Description

Technical Field

[0001] This utility model relates to the field of heat tracing composite pipe technology, and in particular to a heat tracing composite pipe that can prevent expansion and deformation. Background Technology

[0002] Heat tracing composite pipes are widely used in fluid transport systems requiring heat preservation and freeze protection in industries such as petroleum, chemical, and HVAC. Existing structures typically employ an inner pipe with an outer heat tracing cable wrapped around it, followed by an insulation layer and an outer sheath.

[0003] However, when the temperature changes, the difference in the thermal expansion coefficient of the materials can easily cause the inner tube to elongate and bend, which in turn can squeeze the heat tracing cable and the insulation layer, causing local overheating of the heat tracing cable, damage to the insulation structure, or even deformation and failure of the pipe. Utility Model Content

[0004] The purpose of this utility model is to provide a heat tracing composite pipe that can prevent expansion and deformation. This heat tracing composite pipe can effectively absorb the expansion and deformation of the inner pipe within a limited space.

[0005] This utility model provides a heat tracing composite pipe that can prevent expansion and deformation, comprising an inner pipe, a heat tracing tape, an insulation layer, and an outer sheath arranged sequentially from the inside to the outside. The inner pipe is composed of multiple straight pipe sections and corrugated pipe compensation sections connected in series between the straight pipe sections. The outer wall of each straight pipe section is provided with a spiral groove, and the heat tracing tape is embedded in the spiral groove. The corrugated pipe compensation section is fitted with a rigid support ring that can slide relative to its axial direction.

[0006] Preferably, the insulation layer is a rigid polyurethane foam layer formed by high-pressure injection foaming process and continuously wrapped around the inner tube and the heat tracing cable.

[0007] Preferably, the outer sheath is a plastic sheath continuously extruded over the insulation layer.

[0008] Preferably, the rigid support ring is formed by the mating of at least two separate ring pieces, and there is a gap for sliding between its inner wall and the outer wall of the bellows compensation section.

[0009] Preferably, the inner cavity of the rigid support ring is provided with an inwardly protruding annular limiting flanges at both ends, and the corrugated pipe compensation section is located in the inner cavity of the rigid support ring, with the outer walls of the corrugations at both ends abutting against the inner side of the annular limiting flange.

[0010] Preferably, the cross-section of the spiral groove is trapezoidal or semi-circular.

[0011] Preferably, a mesh sleeve made of high-strength fibers is provided between the insulation layer and the outer sheath.

[0012] Preferably, the corrugated pipe compensation section is a stainless steel corrugated pipe.

[0013] This utility model provides a heat tracing composite pipe that can prevent expansion and deformation: By combining the corrugated pipe compensation section with the rigid support ring, when the straight pipe section is heated and elongated, the stress is concentrated on the corrugated pipe compensation section, causing it to undergo axial compression or tension elastic deformation, effectively compensating for the axial expansion and contraction of the inner pipe caused by temperature changes, and preventing the pipe from bending, deforming or being damaged. The spiral groove design ensures the heating cable is firmly embedded, preventing displacement, promoting even heat dissipation, preventing localized overheating, and extending the overall service life of the mechanism. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the straight pipe section, the corrugated pipe compensation section, the spiral groove, the rigid support ring, and the ring plate in this utility model. Figure 3 This is a schematic diagram of the straight pipe section, spiral groove, and heat tracing cable in this utility model; Figure 4 This is a schematic diagram of the structure of the outer sheath, rigid support ring, and mesh sleeve in this utility model; Figure 5 This is a schematic diagram of the structure of the insulation layer, outer sheath, and mesh sleeve in this utility model.

[0016] Explanation of reference numerals in the attached figures: 1-Inner pipe, 11-Straight pipe section, 12-Corrugated pipe compensation section, 111-Spiral groove, 2-Heat tracing tape, 3-Insulation layer, 4-Outer sheath, 5-Rigid support ring, 51-Ring plate, 52-Annular limiting flange, 6-Wire mesh sleeve. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this embodiment, as Figure 1 and Figure 2 As shown, a heat tracing composite pipe that can prevent expansion and deformation includes an inner pipe 1, a heat tracing cable 2, an insulation layer 3, and an outer sheath 4 arranged sequentially from the inside to the outside. The inner pipe 1 is composed of multiple straight pipe sections 11 connected in series with corrugated pipe compensation sections 12 connected between the straight pipe sections 11. The outer wall of the straight pipe section 11 is provided with a spiral groove 111, and the heat tracing cable 2 is embedded in the spiral groove 111. The corrugated pipe compensation section 12 is fitted with a rigid support ring 5 that can slide relative to its axial direction.

[0021] Therefore, the inner pipe 1 adopts a segmented structure, and the straight pipe section 11 is connected in series through the corrugated pipe compensation section 12 to form a expandable pipeline system, which effectively absorbs axial expansion and contraction deformation caused by temperature changes. Specifically, the spiral groove 111 not only facilitates the positioning and installation of the heat tracing cable 2, but also enhances the heat transfer efficiency between the heat tracing cable and the inner tube 1, preventing local overheating or uneven heat dissipation caused by displacement of the heat tracing cable 2.

[0022] In some embodiments, such as Figure 1As shown, the insulation layer 3 is a rigid polyurethane foam layer formed by high-pressure injection foaming process and continuously wrapped around the inner tube 1 and the heat tracing cable 2.

[0023] Specifically, the high-pressure injection foaming process ensures that the insulation layer 3 is seamlessly bonded to the inner pipe 1 and the heat tracing cable 2, forming a continuous and uniform insulation structure, which effectively improves the insulation performance and enhances the overall structural strength.

[0024] In some embodiments, such as Figure 1 As shown, the outer sheath 4 is a plastic sheath continuously extruded outside the insulation layer 3; Specifically, the outer sheath 4 is made of plastic materials such as polyethylene or polyvinyl chloride, which has good corrosion resistance and anti-aging properties, and can effectively protect the internal structure from the influence of the external environment.

[0025] In some embodiments, such as Figure 2 As shown, the rigid support ring 5 is composed of at least two separate ring pieces 51 joined together, and there is a gap for sliding between its inner wall and the outer wall of the bellows compensation section 12. Specifically, the split ring plate 51 is easy to install and disassemble, and the gap between its inner wall and the outer wall of the bellows compensation section 12 allows the two to slide relative to each other in the axial direction, so that no interference occurs during compensation expansion and contraction. It should be noted that the size of this gap is designed based on the maximum expansion and contraction of the corrugated pipe compensation section 12 to ensure that the structure will not be damaged due to friction during thermal expansion and contraction.

[0026] In some embodiments, such as Figure 2 As shown, the inner cavity of the rigid support ring 5 has an inwardly protruding annular limiting flanges 52 at both ends. The bellows compensation section 12 is located in the inner cavity of the rigid support ring 5, and the outer walls of the corrugations at both ends abut against the inner side of the annular limiting flanges 52. Specifically, the annular limiting flange 52 is used to limit the displacement range of the bellows compensation section 12 during axial expansion and contraction, to prevent excessive compression or stretching, and to ensure that the compensation behavior is carried out within a safe range.

[0027] In some embodiments, such as Figure 3 As shown, the cross-section of the spiral groove 111 is trapezoidal or semi-circular.

[0028] Specifically, the trapezoidal or semi-circular cross-section facilitates the embedding and fixing of the heat tracing cable 2, while also promoting uniform heat conduction and preventing localized stress concentration. It should be noted that the pitch and depth of the spiral groove 111 can be adjusted according to the size and heat power requirements of the heat tracing tape 2 to optimize the heat transfer effect.

[0029] In some embodiments, such as Figure 4As shown, a mesh sleeve 6 made of high-strength fiber is provided between the insulation layer 3 and the outer sheath 4; Specifically, the mesh sleeve 6 is placed outside the insulation layer 3, which can enhance the compressive strength and impact resistance of the composite pipe and effectively prevent damage to the insulation layer 3 caused by external compression or soil settlement.

[0030] In some embodiments, such as Figure 2 As shown, the corrugated pipe compensation section 12 is a stainless steel metal corrugated pipe. Specifically, stainless steel has good corrosion resistance and high elasticity, making it suitable for working environments with frequent expansion and contraction, ensuring long-term reliability and durability.

[0031] The working principle of this application is illustrated below with a preferred embodiment: When the pipeline is transporting high-temperature fluid or when the heating cable 2 is started, the straight pipe section 11 of the inner pipe 1 will expand axially due to the thermal effect. The expansion stress is actively absorbed by the corrugated pipe compensation section 12. The corrugated pipe compensation section 12, as a component of the inner pipe 1, is connected in series with the rigid straight pipe section 11. When the straight pipe section 11 is heated and elongated, the stress is concentrated on the corrugated pipe compensation section 12, causing it to undergo axial compression or tension elastic deformation, thereby converting the linear expansion into its own deformation, performing localized compensation of the expansion amount, and preventing the overall bending tendency of the pipeline. Meanwhile, to ensure that the bellows compensation section 12 does not become unstable during deformation (such as lateral torsion or excessive deformation), a rigid support ring 5 is fitted on its outside. The support ring 5 abuts against the crests at both ends of the bellows compensation section 12 through its internal annular limiting flange 52, limiting the deformation range of the bellows within a safe range. At the same time, the gap between the inner wall of the support ring 5 and the outer wall of the bellows compensation section 12 allows for relative axial sliding between the two. In this way, the rigid support ring 5 provides a movable "rigid guide" for the flexible bellows compensation section 12, which limits radial deformation and allows axial expansion and contraction. Finally, the insulation layer 3, which is formed by high-pressure injection foaming, continuously covers the inner pipe 1, the heat tracing cable 2, and the corrugated pipe compensation section 12, forming a complete insulation system. The outer sheath 4 and the optional high-strength mesh sleeve 6 together provide mechanical protection for the insulation layer 3 and the inner pipe 1.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat tracing composite pipe that can prevent expansion and deformation, comprising an inner pipe (1), a heat tracing tape (2), a heat insulation layer (3), and an outer sheath (4) arranged sequentially from the inside to the outside, characterized in that: The inner pipe (1) is composed of multiple straight pipe sections (11) and a corrugated pipe compensation section (12) connected between the straight pipe sections (11) in series; The outer wall of the straight pipe section (11) is provided with a spiral groove (111), and the heat tracing cable (2) is embedded in the spiral groove (111); The corrugated pipe compensation section (12) is fitted with a rigid support ring (5) that can slide relative to its axial direction.

2. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, The insulation layer (3) is a rigid polyurethane foam layer formed by high-pressure injection foaming process and continuously wrapped around the inner tube (1) and the heat tracing cable (2).

3. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, The outer sheath (4) is a plastic sheath continuously extruded outside the insulation layer (3).

4. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, The rigid support ring (5) is formed by the engagement of at least two separate ring pieces (51), and there is a gap for sliding between its inner wall and the outer wall of the bellows compensation section (12).

5. The heat tracing composite pipe for preventing expansion and deformation according to claim 4, characterized in that, The rigid support ring (5) has an inwardly protruding annular limiting flange (52) at both ends of its inner cavity. The corrugated pipe compensation section (12) is located in the inner cavity of the rigid support ring (5), and the outer walls of its two ends of the corrugation crest abut against the inner side of the annular limiting flange (52).

6. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, The cross-section of the spiral groove (111) is trapezoidal or semi-circular.

7. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, A mesh sleeve (6) made of high-strength fiber is provided between the insulation layer (3) and the outer sheath (4).

8. The heat tracing composite pipe for preventing expansion and deformation according to claim 1, characterized in that, The corrugated pipe compensation section (12) is a stainless steel metal corrugated pipe.

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