Electric heat tracing constant-temperature flexible composite pipe
By setting up an electrical heat-tracing structure layer and an insulation layer in the flexible composite pipe, the problem of excessive temperature drop in pipelines in high-altitude areas is solved, and the constant conveying of medium temperature is achieved, meeting user needs and improving insulation performance.
Patent Information
- Application Number
- CN202421975852.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-08-15
AI Technical Summary
When used in high-altitude areas, the effect of insulation cotton is reduced, resulting in excessive temperature drop in the pipeline and cannot meet the user's constant conveying requirements for medium temperature.
An electrically heat-tracing constant temperature flexible composite tube is designed. By setting an electrically heat-tracing structure layer and an insulation layer in the pipeline, the constant temperature of the pipeline is maintained by using the heating function of the electrically heat-tracing structure layer and the insulation effect of the insulation layer.
It effectively reduces the heat loss of the medium during pipeline transportation, ensures the stability of the medium temperature, meets user's usage requirements, and improves the thermal insulation performance of the pipeline.
Smart Images
Figure CN222848890U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of composite pipes, and in particular relates to an electric heating constant temperature flexible composite pipe. Background Art
[0002] Flexible composite pipes are widely used in energy, chemical industry, municipal engineering, geothermal and other fields. They are a new type of non-metallic pipe developed to realize the national concept of "replacing steel with plastic". Especially in fluid transportation, they have advantages that other pipes cannot achieve and have won the favor of the majority of users.
[0003] Among many user groups, high-temperature pipelines occupy a considerable part, and users of high-temperature pipelines usually require pipelines to have certain thermal insulation properties to ensure that the temperature loss of the medium is minimized when the pipeline is transported to the destination. Generally, the temperature drop per kilometer of pipeline is required to be less than 1-2°C. The conventional practice is to use thermal insulation materials such as rubber and plastic sponge, foamed cross-linked polyethylene, and aerogel for insulation. However, these insulation methods cannot allow the pipeline to continuously transport the medium at a constant temperature. Under the influence of cold working conditions in high-altitude areas, the effect of the thermal insulation cotton will be greatly reduced, and the temperature drop per kilometer of pipeline may exceed 5°C, which cannot meet user requirements.
[0004] In view of this situation, it is necessary to design a flexible composite pipe that can maintain a constant temperature so that the heat exchange of the transported medium can be reduced when passing through the pipeline, the heat loss can be minimized, and the user's usage requirements can be met. Utility Model Content
[0005] The technical problem solved by the utility model is to provide a constant temperature flexible composite pipe with electric heating. The utility model aims to design a flexible composite pipe capable of maintaining a constant temperature, so that heat exchange can be reduced when the transported medium passes through the pipeline, heat loss is minimized, and the user's usage requirements are met.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A constant temperature flexible composite pipe with electric heating comprises a working pipe inner lining layer, the outer side of the working pipe inner lining layer is coated with a working pipe reinforcement layer, the outer side of the working pipe reinforcement layer is coated with a working pipe outer protective layer, and also comprises an electric heating structural layer, a thermal insulation layer and an outer protective layer, the thermal insulation layer is coated on the inner side or the outer side of the working pipe outer protective layer, the electric heating structural layer is arranged on the outer side of the working pipe inner lining pipe and on the inner side of the thermal insulation layer, the input end of the electric heating structural layer is connected to a power control cabinet, and the outer protective layer is coated on the outermost layer of the flexible composite pipe.
[0008] To further define the above scheme, the structure of the flexible composite pipe is, from inside to outside, a working pipe lining layer, a working pipe reinforcement layer, a working pipe outer protective layer, an electric heating structure layer, an insulation layer, and an outer protective layer; the electric heating structure layer is arranged on the outside of the working pipe outer protective layer and is fixed with a high-temperature resistant material such as a pressure-sensitive tape or an aluminum foil tape.
[0009] To further define the above scheme, the structure of the flexible composite pipe is, from inside to outside, a working pipe lining layer, a working pipe reinforcement layer, an electric heating structure layer, a working pipe outer protective layer, an insulation layer, and an outer protective layer; the electric heating structure layer is arranged on the outside of the working pipe reinforcement layer and is fixed with a high-temperature resistant material such as a pressure-sensitive tape or an aluminum foil tape.
[0010] To further define the above scheme, the structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer, an electric heating structure layer, a working pipe reinforcement layer, a working pipe outer protective layer, an insulation layer, and an outer protective layer; the electric heating structure layer is arranged on the outside of the working pipe inner lining layer and is fixed by coating an adhesive.
[0011] As a further limitation of the above solution, the electric heating structure layer is formed by laying electric heating tape or electric heating wire on the pipe body.
[0012] As a further limitation of the above scheme, the electric heating tape or electric heating wire is laid in a spiral manner along the surface of the pipe body, in a serpentine manner along the surface of the pipe body, or in a horizontal manner along the axial direction of the pipe.
[0013] As a further limitation of the above scheme, the thermal insulation layer is made of polyurethane, rubber-plastic sponge, foamed cross-linked polyethylene or aerogel material.
[0014] A further limitation of the above scheme also includes at least three sensors, which are respectively arranged on the surface of the electric heating structure layer, at the point on the composite pipe body farthest from the electric heating structure layer, and in the external environment of the composite pipe, and the three sensors are all connected to the power control cabinet.
[0015] The advantages of this utility model compared with the prior art:
[0016] This solution sets an electric heating structure layer in the flexible composite pipe. The operation of the electric heating structure layer can reduce the heat loss during the medium transportation process inside the flexible composite pipe, or heat the medium according to the user's design requirements to make it reach the most ideal design temperature. Compared with the traditional flexible composite pipe with insulation design, it can not only have a better insulation effect, but also realize temperature control operation on the temperature of the medium in the pipe. When the user's temperature demand changes, the heating condition of the pipeline can be changed by adjusting the working temperature of the electric heating structure layer, so that the heat exchange of the transported medium can be reduced when passing through the pipeline, and the heat loss is minimized to meet the user's usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;
[0018] Figure 2 This is a schematic diagram of the structure of the second embodiment of the utility model;
[0019] Figure 3 This is a schematic structural diagram of a third embodiment of the utility model;
[0020] Figure 4 It is a structural schematic diagram of the spiral laying of the electric heating structure layer in the utility model;
[0021] Figure 5 It is a structural schematic diagram of the serpentine laying of the electric heating structure layer in the utility model;
[0022] Figure 6 This is a schematic diagram of the structure of the electric heating structure layer in the utility model being laid horizontally along the axial direction of the pipe;
[0023] Figure 7 It is the conventional operation interface of the power control cabinet in the utility model. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0026] See also Figure 1-7 , describe the embodiments of the present utility model in detail.
[0027] Embodiment 1: An electric heating constant temperature flexible composite pipe, mainly used for conveying high temperature medium or medium with temperature control requirements. It includes a working pipe inner lining layer 1, the outer side of the working pipe inner lining layer 1 is coated with a working pipe reinforcement layer 2, the outer side of the working pipe reinforcement layer 2 is coated with a working pipe outer protective layer 3, and also includes an electric heating structure layer 4, a thermal insulation layer 5 and an outer protective layer 6, the thermal insulation layer 5 is coated on the inner side or outer side of the working pipe outer protective layer 3, the electric heating structure layer 4 is arranged on the outer side of the working pipe inner lining pipe 1 and on the inner side of the thermal insulation layer 5, the input end of the electric heating structure layer 4 is connected to the power control cabinet, and the outer protective layer 6 is coated on the outermost layer of the flexible composite pipe.
[0028] The electric heating structure layer in this embodiment can generate heat by itself when working. The flexible composite pipe can be heated by the heat generated by the electric heating structure layer when working. The temperature is evenly diffused to the entire pipe through the principle of heat transfer. Since the outside is covered with thermal insulation cotton, the pipe can maintain a set temperature constantly. The set temperature is generally close to the required temperature for medium transportation. When the medium passes through the pipe, since the temperatures of the two are close, heat exchange will not occur, thereby effectively reducing the temperature loss of the medium.
[0029] Example 2: See Figure 1 As shown, the structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer 1, a working pipe reinforcement layer 2, a working pipe outer protective layer 3, an electric heating structure layer 4, an insulation layer 5, and an outer protective layer 6. In this embodiment, the electric heating structure layer 4 is arranged on the outside of the working pipe outer protective layer 3 and is fixed with a high temperature resistant material such as a pressure sensitive tape or an aluminum foil tape.
[0030] Example 3: See Figure 2 As shown, the structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer 1, a working pipe reinforcement layer 2, an electric heating structure layer 4, a working pipe outer protective layer 3, a thermal insulation layer 5, and an outer protective layer 6. In this embodiment, the electric heating structure layer 4 is arranged on the outside of the working pipe reinforcement layer 2 and is fixed with a high temperature resistant material such as a pressure sensitive tape or an aluminum foil tape.
[0031] In the above two embodiments, when the electric heating structure layer is arranged outside the working pipe reinforcement layer and outside the working pipe outer protective layer, it will not affect the pressure bearing capacity of the pipeline. At this time, high temperature resistant materials such as pressure sensitive tape and aluminum foil tape can be used for fixing before proceeding to the next production process.
[0032] Example 4: See Figure 3As shown, the structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer 1, an electric heating structure layer 4, a working pipe reinforcement layer 2, a working pipe outer protective layer 3, a thermal insulation layer 5, and an outer protective layer 6. In this embodiment, when the electric heating structure layer 4 is disposed outside the working pipe inner lining layer 1, it is fixed by coating an adhesive so that the outer surface of the structure layer is smooth and uniform, and the pressure bearing capacity of the reinforcement layer is not reduced.
[0033] In the above-mentioned embodiments, the electric heating structural layer is respectively laid outside the inner lining layer of the working pipe, outside the working pipe reinforcement layer and outside the working pipe outer protective layer. Therefore, the electric heating structural layer may be adjacent to the thermal insulation layer, or may be separated by several other structural layers. The above-mentioned embodiments only show the conventional structural layer of the electric heating constant temperature flexible composite pipe, not the matching design of all structural layers. Therefore, the present invention is not limited to the processing sequence of each layer structure. When a thermal insulation layer is provided outside the thermal insulation layer, it should also be within the protection scope of this scheme.
[0034] In a specific embodiment, the electric heating structure layer 4 is formed by laying an electric heating tape or electric heating wire on the pipe body. Preferably, the laying method of the electric heating tape or electric heating wire is spiral laying along the surface of the pipe body, serpentine laying along the surface of the pipe body, and horizontal laying along the axial direction of the pipe. The three laying methods are as follows: Figure 4-6 shown.
[0035] In this embodiment, the operation of the electric heating structure layer is controlled by a control cabinet, and a one-way connection method can be adopted, where one end is connected to the control cabinet, and the other end can be wrapped with high-temperature resistant tape and wrapped in insulation cotton, which will not affect the operation of the electric heating tape / wire.
[0036] In a specific embodiment, at least three sensors are also included. The three sensors are respectively arranged on the surface of the electric heating structure layer 4, at the farthest point on the composite pipe body from the electric heating structure layer 4, and in the external environment of the composite pipe for monitoring. The three sensors are all connected to the power control cabinet. The two sensors arranged on the composite pipe should be covered with thermal insulation cotton. The measurement data of the two sensors in front is used to control the operation of the electric heating structure layer, and the set temperature is compensated by the sensors in the external environment. The conventional operation interface of the power control box is shown in the attached figure. Figure 7 As shown, the display content of the sensor can be appropriately increased or decreased according to user requirements.
[0037] Preferably, the thermal insulation layer 5 is made of polyurethane, rubber-plastic sponge, foamed cross-linked polyethylene or aerogel material.
[0038] The difference between this electric heating constant temperature flexible composite pipe and the traditional insulation flexible composite pipe is as follows: 1. The traditional insulation flexible composite pipe directly wraps the insulation cotton on the outside of the pipe to play the role of insulation, while this electric heating constant temperature flexible composite pipe enables the pipe itself to have a certain heating effect, and then cooperates with the insulation cotton to insulate the internal medium. 2. The traditional insulation flexible composite pipe can only insulate the pipe. At the beginning of operation, the medium needs to heat the pipe first, so that the pipe has a certain temperature, and then the heat loss can be reduced. However, the heat loss of the medium in the initial operation will be very large; while this electric heating constant temperature flexible composite pipe can heat the pipe before conveying the medium, and there is no need to consume the heat of the medium to preheat the pipe. 3. The traditional insulation flexible composite pipe can only determine the heat loss of the medium by measuring the temperature at the inlet and outlet, and adjust the inlet temperature to ensure the outlet temperature; while this electric heating constant temperature flexible composite pipe can increase the temperature of the electric heating belt / wire during the operation of the pipeline to achieve heating during transportation and ensure that the outlet temperature meets the design requirements.
[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. An electrically heated constant temperature flexible composite pipe, comprising a working pipe inner lining layer (1), the outer side of the working pipe inner lining layer (1) is coated with a working pipe reinforcement layer (2), and the outer side of the working pipe reinforcement layer (2) is coated with a working pipe outer protective layer (3), characterized in that: It also comprises an electric heating structure layer (4), a thermal insulation layer (5) and an outer protective layer (6), wherein the thermal insulation layer (5) is coated on the inner side or the outer side of the outer protective layer (3) of the working pipe, the electric heating structure layer (4) is arranged on the outer side of the inner lining layer (1) of the working pipe and on the inner side of the thermal insulation layer (5), the input end of the electric heating structure layer (4) is connected to a power supply control cabinet, and the outer protective layer (6) is coated on the outermost layer of the flexible composite pipe.
2. The electric heating constant temperature flexible composite pipe according to claim 1, characterized in that: The structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer (1), a working pipe reinforcement layer (2), a working pipe outer protective layer (3), an electric heating structure layer (4), a thermal insulation layer (5), and an outer protective layer (6); the electric heating structure layer (4) is arranged on the outside of the working pipe outer protective layer (3) and is fixed by a high temperature resistant material such as a pressure sensitive tape or an aluminum foil tape.
3. The electric heating constant temperature flexible composite pipe according to claim 1, characterized in that: The structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer (1), a working pipe reinforcement layer (2), an electric heating structure layer (4), a working pipe outer protective layer (3), a thermal insulation layer (5), and an outer protective layer (6); the electric heating structure layer (4) is arranged on the outside of the working pipe reinforcement layer (2) and is fixed by a high temperature resistant material such as a pressure sensitive tape or an aluminum foil tape.
4. The electric heating constant temperature flexible composite pipe according to claim 1, characterized in that: The structure of the flexible composite pipe is, from inside to outside, a working pipe inner lining layer (1), an electric heating structure layer (4), a working pipe reinforcement layer (2), a working pipe outer protective layer (3), a thermal insulation layer (5), and an outer protective layer (6); the electric heating structure layer (4) is arranged outside the working pipe inner lining layer (1) and is fixed thereto by coating an adhesive.
5. The electrically heated constant temperature flexible composite pipe according to claim 1, characterized in that: The electric heating structure layer (4) is formed by laying electric heating tapes or electric heating wires on the pipe body.
6. The electrically heated constant temperature flexible composite pipe according to claim 5, characterized in that: The electric heating tape or electric heating wire is laid in a spiral manner along the surface of the pipe body, in a serpentine manner along the surface of the pipe body, or in an axially horizontal manner along the surface of the pipe body.
7. The electrically heated constant temperature flexible composite pipe according to claim 1, characterized in that: The thermal insulation layer (5) is made of polyurethane, rubber-plastic sponge, foamed cross-linked polyethylene or aerogel material.
8. The electrically heated constant temperature flexible composite pipe according to claim 1, characterized in that: It also includes at least three sensors, which are respectively arranged on the surface of the electric heating structure layer (4), at the point on the composite pipe body farthest from the electric heating structure layer (4), and in the external environment of the composite pipe, and the three sensors are all connected to the power control cabinet.