A pipe internal heating structure

Abstract

The utility model provides a pipeline internal heating structure relates to pipeline heating field, including the pipeline body (1) of recess (6) of outside wall setting, pipeline body (1) outside wall evenly coats a layer of amorphous coating (2), and recess (6) of coating amorphous coating (2) inserts heating resistance wire (3). This structure discards the means of passive isolation outside environment of cladding heat -preserving material, prevents the freezing or gas liquefaction of liquid in the pipeline and so on through the mode of active heating, not only avoids the excessive increase of pipeline weight and volume, but also can realize the heating of gas, liquid in the pipeline fast, promotes its transmission efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pipeline heating technology, specifically to an internal heating structure for pipelines. Background Technology

[0002] Pipelines (such as cast iron pipes and steel pipes) are characterized by good corrosion resistance, high strength, good sealing performance, and excellent high-temperature resistance. They are commonly used for transporting oil, gas, and liquids, and have wide applications in the construction, industrial manufacturing, and energy sectors. However, in extremely cold environments, due to the influence of sub-zero external temperatures, the viscosity of liquid substances transported in pipelines may increase, or even freeze, thus affecting the pipeline's transport efficiency and, in severe cases, causing pipeline blockage. Gaseous substances transported in pipelines may liquefy, leading to "slug flow" (an unstable flow state during gas-liquid mixing), which further exacerbates wear and pressure fluctuations within the pipeline. To prevent the gas and liquid transported inside pipelines from being affected by the external low-temperature environment, existing technologies typically employ the method of covering the outer wall of the pipeline with thermal insulation material to prevent the liquid inside from freezing and the gas from liquefying. For example, Chinese patent document CN219389040U discloses a pipeline antifreeze structure, which uses a structural design of a first antifreeze shell, a second antifreeze shell, and a thermal insulation layer to prevent the pipeline interior from being affected by the external cold environment. However, this method mainly depends on the properties of the thermal insulation material itself (i.e., the thermal insulation performance is closely related to the material's properties) and thickness. It is very easy to end up with a thick layer of thermal insulation material covering the outer ring of the pipeline, which not only increases the usable space of the pipeline, causing space waste, but also increases the overall weight of the pipeline and reduces its applicable fields. In addition, when the thermal insulation layer is damaged, it will seriously affect its insulation effect, thereby causing the pipeline interior to be affected by the external environment again, reducing the pipeline's service life. Utility Model Content

[0003] To address the problems existing in the prior art, the purpose of this utility model is to provide an internal heating structure for pipelines. This structure abandons the method of passively isolating the external environment by covering with insulation materials, and prevents problems such as freezing of liquid and liquefaction of gas inside the pipeline by active heating, effectively avoiding excessive increase in the volume and weight of the pipeline, and has a wide range of applications.

[0004] The objective of this utility model is achieved through the following technical solution: An internal heating structure for a pipe includes a pipe body with a groove on its outer wall, the outer wall of the pipe body (including the inner side wall of the groove) is uniformly coated with an amorphous coating, and a heating resistance wire is embedded in the groove coated with the amorphous coating.

[0005] Based on further optimization of the above scheme, the groove can be either a horizontal groove evenly distributed around the central axis of the pipe body or a spiral groove spirally wound around the outer wall of the pipe body.

[0006] Based on further optimization of the above scheme, the thickness of the amorphous coating is 40μm to 200μm; the amorphous coating uses: Fe 36 Cr 23 Mo 18 C 15 B6Y2 or Fe 43 Co 4.5 Cr 16.5 Mo 16.5 C 14 B4Y 1.5 Any one of them.

[0007] Based on further optimization of the above scheme, an annular snap-fit ​​outer shell is coaxially provided on the outer wall of the pipe body. The inner diameter of the snap-fit ​​outer shell is not less than the outer diameter of the pipe body after the amorphous coating is applied, thereby fixing the heating resistance wire and preventing the heating resistance wire from falling out of the corresponding groove.

[0008] Based on further optimization of the above scheme, the thickness of the snap-fit ​​outer shell is 1-3mm.

[0009] The following are the technical effects of this utility model: This application utilizes an amorphous coating to both insulate the heating resistance wire within the groove, preventing the heating resistance wire from conducting electricity with the liquid inside the pipe through the side wall of the pipe body, and ensuring that the heat generated by the heating resistance wire can be quickly and evenly transferred to the interior of the pipe body, thereby heating the interior of the pipe body and preventing problems such as liquid freezing or gas liquefaction inside the pipe body caused by severe external cold environments. By creating grooves on the outer wall of the pipe body, the heating resistance wire can be effectively installed and positioned, and heat can be effectively diffused into the interior through the pipe body wall, ensuring the guidance and real-time nature of the heating. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of one embodiment of the heating structure of this utility model.

[0011] Figure 2 This is another schematic diagram of the heating structure in an embodiment of the present invention.

[0012] Figure 3 for Figure 1 The longitudinal sectional view of the corresponding heating structure.

[0013] The components include: 1. Pipe body; 2. Amorphous coating; 3. Heating resistance wire; 4. Snap-fit ​​outer shell; 5. Heat insulation outer shell; 6. Groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Example 1: An internal heating structure for a pipe includes a pipe body 1 with grooves 6 formed on its outer wall. The grooves 6 are horizontal grooves evenly distributed around the central axis of the pipe body 1 (combined with...). Figure 1 and Figure 3 As shown, multiple horizontal grooves are parallel to the axis of the pipe body and are evenly distributed around the central axis of the pipe body 1; the number of horizontal grooves is set according to the specific dimensions of the pipe body 1 and the heating resistance wire 3, to ensure uniform heating of the sidewall of the pipe body 1) and spiral grooves (such as those spirally wound around the outer wall of the pipe body 1) are also present. Figure 2 As shown, the spiral groove is spirally wound around the outer wall of the pipe body 1. The adjacent pitch of the spiral groove is set according to the size of the pipe body 1 and the heating resistance wire 3, and it is necessary to ensure that the side wall of the pipe body 1 is heated evenly.

[0016] A uniform layer of amorphous coating 2 is applied to the outer wall of the pipe body 1 (including the inner sidewall of the groove 3). This coating can be applied via ultra-high-speed laser spraying or other spraying methods, ensuring a tight bond between the amorphous coating 2 and the outer wall of the pipe body 1 and the inner wall of the groove 3. The thickness of the amorphous coating is 40μm to 200μm. The amorphous coating uses Fe... 36 Cr 23 Mo 18 C 15 B6Y2 or Fe 43 Co 4.5 Cr 16.5 Mo 16.5 C 14 B4Y 1.5 Any one of them. A heating resistance wire 3 (such as...) is embedded in the groove coated with an amorphous coating 2. Figure 1 , Figure 2 or Figure 3 (As shown) and the wire ends of the heating resistance wire 3 are located at both ends of the pipe body 1, so that it can be connected to the external power supply system.

[0017] The outer wall of the pipe body 1 is coaxially provided with an annular snap-fit ​​outer shell 4 (e.g. Figure 3As shown, the snap-fit ​​outer shell 4 and the central axis of the pipe body 1 are collinear. The inner diameter of the snap-fit ​​outer shell 4 is not less than the outer diameter of the pipe body 1 after the amorphous coating 2 is applied (generally, the inner diameter of the snap-fit ​​outer shell 4 is equal to or slightly larger than the outer diameter of the pipe body 1 + 2 × the thickness of the amorphous coating 2), thereby fixing the heating resistance wire 3 and preventing the heating resistance wire 3 from detaching from the corresponding groove 6. The thickness of the snap-fit ​​outer shell 4 is 1 to 3 mm, and the snap-fit ​​outer shell is made of any one of steel, aluminum or its alloy, or stainless steel.

[0018] Example 2: As a further optimization of the present invention, based on the scheme of Embodiment 1, in order to prevent the outer wall temperature of the snap-fit ​​outer shell 4 from becoming too high during the heating process of the heating resistance wire 3 and transmitting it to the outside environment, thus affecting the external environment, a heat insulation shell 5 is coaxially provided on the outer wall of the snap-fit ​​outer shell 4, and the inner wall of the heat insulation shell 5 is attached to the outer wall of the snap-fit ​​outer shell 4. The thickness of the heat insulation shell 5 is not greater than the thickness of the pipe body 1. The heat insulation shell can be made of any one of the following materials: nitrile rubber, glass wool felt, aluminum silicate fiber felt, or aerogel felt.

[0019] Example 3: As a further optimization of the present utility model, based on the scheme of embodiment 1, in order to ensure the assemblability of the pipe body 1, an internal thread is provided on the inner wall of one end of the pipe body 1, and a protrusion with an external thread is provided on the other end. Rubber sealing rings are provided at both ends of the pipe body 1 for sealing during the connection process. The rubber sealing rings are located in the inner ring of the groove 6.

Claims

1. A pipe internal heating structure, characterized in that: The pipe body includes a groove on its outer wall, and the outer wall of the pipe body is uniformly coated with an amorphous coating. A heating resistance wire is embedded in the groove coated with the amorphous coating.

2. The pipe internal heating structure according to claim 1, characterized in that: The groove can be either a horizontal groove evenly distributed around the central axis of the pipe body or a spiral groove spirally wound around the outer wall of the pipe body.

3. A pipe internal heating structure according to claim 1 or 2, characterized in that: The thickness of the amorphous coating is 40μm to 200μm.

4. The pipe internal heating structure according to claim 3, characterized in that: The outer wall of the pipe body is coaxially provided with an annular snap-fit ​​outer shell, and the inner diameter of the snap-fit ​​outer shell is not less than the outer diameter of the pipe body after the amorphous coating is applied.

5. The pipe internal heating structure according to claim 4, characterized in that: The thickness of the snap-fit ​​outer shell is 1 to 3 mm.

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